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Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Borrowing from Nature to Produce Highly Structured Biomimetic Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Doing Nature One Better Biological tissues such as those that make up our organs are amazing feats of structural engineering. Even more fantastic, the tissues assemble themselves from building blocks based on the proteins that cells synthesize without any outside direction. And, if this isn't mind-boggling enough, consider how all this takes place over large distances with both precision and accuracy. Chemists and materials scientists would dearly like to lift a few pages out of nature's instruction manual and use their wisdom to construct complex structures that do human bidding. Unfortunately, that book is not yet for sale, so the would-be engineers have to find other ways to mimic nature as best they can.

2

Borrowing from Nature to Produce Highly Structured Biomimetic Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Doing Nature One Better Biological tissues such as those that make up our organs are amazing feats of structural engineering. Even more fantastic, the tissues assemble themselves from building blocks based on the proteins that cells synthesize without any outside direction. And, if this isn't mind-boggling enough, consider how all this takes place over large distances with both precision and accuracy. Chemists and materials scientists would dearly like to lift a few pages out of nature's instruction manual and use their wisdom to construct complex structures that do human bidding. Unfortunately, that book is not yet for sale, so the would-be engineers have to find other ways to mimic nature as best they can.

3

Borrowing from Nature to Produce Highly Structured Biomimetic Materials  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Borrowing from Nature to Produce Highly Structured Biomimetic Materials Print Doing Nature One Better Biological tissues such as those that make up our organs are amazing feats of structural engineering. Even more fantastic, the tissues assemble themselves from building blocks based on the proteins that cells synthesize without any outside direction. And, if this isn't mind-boggling enough, consider how all this takes place over large distances with both precision and accuracy. Chemists and materials scientists would dearly like to lift a few pages out of nature's instruction manual and use their wisdom to construct complex structures that do human bidding. Unfortunately, that book is not yet for sale, so the would-be engineers have to find other ways to mimic nature as best they can.

4

A novel biomimetic approach to the design of high-performance  

E-Print Network [OSTI]

, ceramic­metal composites are ideal candi- dates. In particular, ceramic-matrix composites (CMCsA novel biomimetic approach to the design of high-performance ceramic­metal composites Maximilien E of extending natural biological design to develop new synthetic ceramic­ metal composite materials is examined

Ritchie, Robert

5

A Miniature Biomimetic Robotic Fish and Its Realtime Path Planning  

E-Print Network [OSTI]

A Miniature Biomimetic Robotic Fish and Its Realtime Path Planning Chao Zhou, Zhiqiang Cao, Shuo a novel miniature biomimetic robotic fish based on single link with compact structure, high maneuverability and multiple sensors. The robotic fish mimics the motion of Thunniform mode, and the methods

Boyer, Edmond

6

S09 Symposium KK, Structure-Property Relationships in Biomineralized and Biomimetic Composites  

SciTech Connect (OSTI)

The technical presentations and discussions at this symposium disseminated and assessed current research and defined future directions in biomaterials research, with a focus on structure-function relationships in biological and biomimetic composites. The invited and contributed talks covered a diverse range of topics from fundamental biology, physics, chemistry, and materials science to potential applications in developing areas such as light-weight composites, multifunctional and smart materials, biomedical engineering, and nanoscaled sensors. The invited speakers were chosen to create a stimulating program with a mixture of established and junior faculty, industrial and academic researchers, and American and international experts in the field. This symposium served as an excellent introduction to the area for younger scientists (graduate students and post-doctoral researchers). Direct interactions between participants also helped to promote potential future collaborations involving multiple disciplines and institutions.

David Kisailus; Lara Estroff; Himadri S. Gupta; William J. Landis; Pablo D. Zavattieri

2010-06-07T23:59:59.000Z

7

Biomimetic modelling  

Science Journals Connector (OSTI)

...me real- ize that engineers have to design things...sort of engin- eering environment. There are few biomimetic...between biology and engineer- ing are based on...establish a way in which engineers can access ideas from...within an engineering environment only. TRIZ takes design...

2003-01-01T23:59:59.000Z

8

Developing Biomimetic Design Principles for the Highly Optimized and Robust Design of Products and Their Components  

E-Print Network [OSTI]

and the difference in biological and engineering terminologies. This research developed a new design tool that addresses these problems and proposes to help engineering designers develop candidate bio-inspired products or solutions. A methodology that helps users... for candidate biomimetic products that are novel, innovative, and robust. The principle extraction methodology and the identified principles are validated using two separate case studies and a detailed analysis using the validation square framework...

Wadia, Anosh Porus

2011-10-21T23:59:59.000Z

9

Biomimetic Nanostructures: Creating  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Biomimetic Nanostructures: Creating a High-Affinity Zinc-Binding Site in a Folded Nonbiological Polymer Byoung-Chul Lee, †,‡ Tammy K. Chu, † Ken A. Dill,* ,‡ and Ronald N. Zuckermann* ,† Biological Nanostructures Facility, The Molecular Foundry, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, Graduate group in Biophysics and Department of Pharmaceutical Chemistry, 600 16th Street, UniVersity of CaliforniasSan Francisco, San Francisco, California 94143 Received March 21, 2008; E-mail: dill@maxwell.compbio.ucsf.edu; rnzuckermann@lbl.gov Abstract: One of the long-term goals in developing advanced biomaterials is to generate protein-like nanostructures and functions from a completely nonnatural polymer. Toward that end, we introduced a high-affinity zinc-binding function into a peptoid (N-substituted glycine

10

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

11

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

12

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

13

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

14

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

15

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Biomimetic Dye Molecules for Solar Cells Print Biomimetic Dye Molecules for Solar Cells Print Pressing energy problems provide opportunities for solid-state physicists and chemists to solve a major challenge: solar cell adoption. Though solar cells can use energy directly from the Sun to produce electricity that can be converted efficiently into other kinds of energy, they are currently too costly to compete with traditional (polluting) energy sources. The most cost-effective solar cells are not high-end, high-efficiency single-crystal devices, but rather low-end cells based on organic molecules or conducting polymers. Vital information for making organic solar cells more competitive for widespread implementation was obtained using near-edge x-ray absorption fine structure (NEXAFS) spectroscopy performed at ALS Beamline 8.0.1. The relevant energy levels of biomimetic dye molecules were mapped out systematically by determining their unoccupied molecular orbitals and their orientation. Organic molecules in dye-sensitized solar cells exhibit great potential to increase the efficiency and reduce the cost of photovoltaic power generation by allowing a wide variety of chemical modifications and combinations with inorganic nanocrystals.

16

Analysis of biomimetics in the application of robotic locomotion with a focus on structures, materials and dynamics  

E-Print Network [OSTI]

Biomimetics is the study and analysis of natural systems to inform engineering design and technology development. Through interdisciplinary research and analysis of natural phenomena, engineers are able to gain valuable ...

Miller, Ari Parsons

2011-01-01T23:59:59.000Z

17

A novel biomimetic approach to the design of high-performance ceramic/metal composites  

SciTech Connect (OSTI)

The prospect of extending natural biological design to develop new synthetic ceramic-metal composite materials is examined. Using ice-templating of ceramic suspensions and subsequent metal infiltration, we demonstrate that the concept of ordered hierarchical design can be applied to create fine-scale laminated ceramic-metal (bulk) composites that are inexpensive, lightweight and display exceptional damage-tolerance properties. Specifically, Al{sub 2}O{sub 3}/Al-Si laminates with ceramic contents up to approximately 40 vol% and with lamellae thicknesses down to 10 {micro}m were processed and characterized. These structures achieve an excellent fracture toughness of 40 MPa{radical}m at a tensile strength of approximately 300 MPa. Salient toughening mechanisms are described together with further toughening strategies.

Launey, Maximilien E.; Munch, Etienne; Alsem, Daan Hein; Saiz, Eduardo; Tomsia, Antoni P.; Ritchie, Robert O.

2009-08-01T23:59:59.000Z

18

Microtubule-templated biomimetic mineralization of lepidocrocite.  

SciTech Connect (OSTI)

Protein microtubules (MTs) 25 nm in diameter and tens of micrometers long have been used as templates for the biomimetic mineralization of FeOOH. Exposure of MTs to anaerobic aqueous solutions of Fe{sup 2+} buffered to neutral pH followed by aerial oxidation leads to the formation of iron oxide coated MTs. The iron oxide layer was found to grow via a two-step process: initially formed 10-30 nm thick coatings were found to be amorphous in structure and comprised of several iron-containing species. Further growth resulted in MTs coated with highly crystalline layers of lepidocrocite with a controllable thickness of up to 125 nm. On the micrometer size scale, these coated MTs were observed to form large, irregular bundles containing hundreds of individually coated MTs. Iron oxide grew selectively on the MT surface, a result of the highly charged MT surface that provided an interface favorable for iron oxide nucleation. This result illustrates that MTs can be used as scaffolds for the in-situ production of high-aspect-ratio inorganic nanowires.

Bunker, Bruce Conrad; Headley, Thomas Jeffrey; Tissot, Ralph George, Jr.; Boal, Andrew Kiskadden

2003-08-01T23:59:59.000Z

19

High Temperature Structural Foam  

Science Journals Connector (OSTI)

The Aerospace Industry is experiencing growing demand for high performance polymer foam. The X-33 program needs structural foam insulation capable of retaining its strength over a wide range of environmental conditions. The High Speed Research Program ...

Weiser Erik S.; Baillif Faye F.; Grimsley Brian W.; Marchello Joseph M.

1998-05-01T23:59:59.000Z

20

Biomimetic processing of oriented crystalline ceramic layers  

SciTech Connect (OSTI)

The aim of this project was to develop the capabilities for Sandia to fabricate self assembled Langmuir-Blodgett (LB) films of various materials and to exploit their two-dimensional crystalline structure to promote the growth of oriented thin films of inorganic materials at room temperature. This includes the design and synthesis of Langmuir-active (amphiphilic) organic molecules with end groups offering high nucleation potential for various ceramics. A longer range goal is that of understanding the underlying principles, making it feasible to use the techniques presented in this report to fabricate unique oriented films of various materials for electronic, sensor, and membrane applications. Therefore, whenever possible, work completed in this report was completed with the intention of addressing the fundamental phenomena underlying the growth of crystalline, inorganic films on template layers of highly organized organic molecules. This problem was inspired by biological processes, which often produce exquisitely engineered structures via templated growth on polymeric layers. Seashells, for example, exhibit great toughness owing to their fine brick-and-mortar structure that results from templated growth of calcium carbonate on top of layers of ordered organic proteins. A key goal in this work, therefore, is to demonstrate a positive correlation between the order and orientation of the template layer and that of the crystalline ceramic material grown upon it. The work completed was comprised of several parallel efforts that encompassed the entire spectrum of biomimetic growth from solution. Studies were completed on seashells and the mechanisms of growth for calcium carbonate. Studies were completed on the characterization of LB films and the capability developed for the in-house fabrication of these films. Standard films of fatty acids were studied as well as novel polypeptides and porphyrins that were synthesized.

Cesarano, J.; Shelnutt, J.A.

1997-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

3D printing as an efficient way for comparative study of biomimetic structures trabecular bone and honeycomb  

Science Journals Connector (OSTI)

The mechanical properties of engineered trabecular bone and honeycomb structures are investigated by the combined use of the 3D printing technology and the compression test. The engineered ... those by the previo...

Yong-Jin Yoon; Seung Ki Moon; Jihong Hwang

2014-11-01T23:59:59.000Z

22

Sensing bending in a compliant biomimetic fish  

E-Print Network [OSTI]

This thesis examines the problem of sensing motion in a compliant biomimetic device. Specifically, it will examine the motion of a tail in a biomimetic fish. To date, the fish has been an open-loop system, the motion of ...

Kaczmarek, Adam S

2006-01-01T23:59:59.000Z

23

Recent advances in biomimetic sensing technologies  

Science Journals Connector (OSTI)

...defence and aerospace industry...the social sciences (Wahl 2006...described recent advances in biomimetic...vehicles, aerospace, security...nature with science and engineering...WIT Press. Recent advances in biomimetic...

2009-01-01T23:59:59.000Z

24

Biomimetic interfaces based on S-layer proteins, lipid membranes and functional biomolecules  

Science Journals Connector (OSTI)

...ideas and inspiration for nanotechnology. A pivotal role concerning...biotechnology applications in medicine, diagnostics, sensor systems...structure to biomimetics and nanotechnology. Angew. Chem. Int. Ed...Schuster. 2004 Molecular nanotechnology and nanobiotechnology with...

2014-01-01T23:59:59.000Z

25

Biomimetic self-assembly of a functional asymmetrical electronic device  

E-Print Network [OSTI]

Biomimetic self-assembly of a functional asymmetrical electronic device Mila Boncheva, David H--patterned with logic devices, wires, and solder dots--were connected in a linear string by using flexible wire. On self-assembly­3). Biological structures arise by con- strained self-assembly, and are usually three-dimensional (3D) (4). We

Prentiss, Mara

26

Metalloproteins: Structure Determination (HADH), Inhibition (P4H), and Biomimetic Systems (P-1[Ru(NO)(Cl)])  

E-Print Network [OSTI]

A) Phen-2-GKDEL B)Phen-2 157 -E(EDANS)VKDEL Figure 3.5. Dipsi spectrum of phen-2-GKDEL on Bruker 50 MHz 158 NMR Figure 3.6. Dipsi spectrum of phen-2-E(EDANS)VKDEL on Bruker 159 50 MHz NMR Figure 3.7. Fluorescence imaging of HF...-P4H. Figure 3.10. Colagen production by HF cels with no inhibitor (red 166 boxes) and phen-GKDEL (gren diamonds). x Figure 3.1. The chemical structure of the dye that covalently links 167 to colagen types I through V in the Sircol...

Reed, Timothy Michael

2008-01-01T23:59:59.000Z

27

Long range excitonic transport in a biomimetic system inspired by the bacterial light-harvesting apparatus  

SciTech Connect (OSTI)

Photosynthesis, the process by which energy from sunlight drives cellular metabolism, relies on a unique organization of light-harvesting and reaction center complexes. Recently, the organization of light-harvesting LH2 complexes and dimeric reaction center-light-harvesting I-PufX core complexes in membranes of purple non-sulfur bacteria was revealed by atomic force microscopy [S. Bahatyrova et al., Nature (London) 430, 1058 (2004)]. Here, we discuss optimal exciton transfer in a biomimetic system closely modeled on the structure of LH2 and its organization within the membrane using a Markovian quantum model with dissipation and trapping added phenomenologically. In a deliberate manner, we neglect the high level detail of the bacterial light-harvesting complex and its interaction with the phonon bath in order to elucidate a set of design principles that may be incorporated in artificial pigment-scaffold constructs in a supramolecular assembly. We show that our scheme reproduces many of the most salient features found in their natural counterpart and may be largely explained by simple electrostatic considerations. Most importantly, we show that quantum effects act primarily to enforce robustness with respect to spatial and spectral disorder between and within complexes. The implications of such an arrangement are discussed in the context of biomimetic photosynthetic analogs capable of transferring energy efficiently across tens to hundreds of nanometers.

Harel, Elad [Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208 (United States)

2012-05-07T23:59:59.000Z

28

High temperature turbine engine structure  

DOE Patents [OSTI]

A high temperature turbine engine includes a rotor portion having axially stacked adjacent ceramic rotor parts. A ceramic/ceramic joint structure transmits torque between the rotor parts while maintaining coaxial alignment and axially spaced mutually parallel relation thereof despite thermal and centrifugal cycling.

Boyd, Gary L. (Tempe, AZ)

1991-01-01T23:59:59.000Z

29

Biomimetic growth of strontium oxalate aggregates with unusual morphologies in the presence of poly(methacrylic acid)  

E-Print Network [OSTI]

Paper Biomimetic growth of strontium oxalate aggregates with unusual morphologies in the presence-like strontium oxalate dihydrate (SOD) crystals. The formation of the unusual aggregated structures showed fractal structures.20 In the present work, we investigated the crystallization of strontium

Qi, Limin

30

Conference Program Neurotechnology for Biomimetic Robots  

E-Print Network [OSTI]

Conference Program Neurotechnology for Biomimetic Robots Marine Science Center Northeastern University East Point, Nahant, MA 01908 May 14-16, 2000 Organizers: Joseph Ayers Marine Science Center robots. Swimming robots achieve propulsion by whole body undulations or tail flapping. Walking robots use

Ayers, Joseph

31

Approaches for biological and biomimetic energy conversion  

Science Journals Connector (OSTI)

...biological and biomimetic energy conversion 10.1073...that are related to energy conversion: specifically...synthetic and/or hybrid devices is still...systems that produce energy in an efficient...costs are related to infrastructure, such as supporting...inverters, and grid connections. For...

David A. LaVan; Jennifer N. Cha

2006-01-01T23:59:59.000Z

32

Sandia National Laboratories: ECIS-UNM: Biomimetic Membranes...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of desalination (making fresh water from seawater), but the energy requirements and costs for this process are tremendous and offset the benefits. A nanoporous biomimetic...

33

Making biomimetic complexes to produce hydrogen fuel | Center...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

biomimetic complexes to produce hydrogen fuel 4 Nov 2012 Souvik Roy, graduate student (Subtask 3, laboratory of Anne Jones). "I am involved mostly in mimicking Fe-hydrogenases,...

34

Passive Sensing and Active Sensing of A Biomimetic Whisker DaeEun Kim1 and Ralf Moller2  

E-Print Network [OSTI]

the whisker carrying a permanent magnet is surrounded by mag- netic sensors, and these sensors can measure reported that a biomimetic whisker with steel shaft and magnetic sensors can measure the vibration. In the biological whisker sys- tem, mechanoreceptors surrounding the whisker shaft in the follicle structure measure

Moeller, Ralf

35

Conformal coating of highly structured surfaces  

DOE Patents [OSTI]

Method of applying a conformal coating to a highly structured substrate and devices made by the disclosed methods are disclosed. An example method includes the deposition of a substantially contiguous layer of a material upon a highly structured surface within a deposition process chamber. The highly structured surface may be associated with a substrate or another layer deposited on a substrate. The method includes depositing a material having an amorphous structure on the highly structured surface at a deposition pressure of equal to or less than about 3 mTorr. The method may also include removing a portion of the amorphous material deposited on selected surfaces and depositing additional amorphous material on the highly structured surface.

Ginley, David S.; Perkins, John; Berry, Joseph; Gennett, Thomas

2012-12-11T23:59:59.000Z

36

High temperature turbine engine structure  

DOE Patents [OSTI]

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1994-01-01T23:59:59.000Z

37

High temperature turbine engine structure  

DOE Patents [OSTI]

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1993-01-01T23:59:59.000Z

38

High temperature turbine engine structure  

DOE Patents [OSTI]

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1992-01-01T23:59:59.000Z

39

Wetting transitions on biomimetic surfaces  

Science Journals Connector (OSTI)

...increasing gap size, decreasing pillar height, or decreasing contact...only the pores adjacent to the three-phase (triple) line are...pores in the vicinity of the three-phase line are filled...of surface structure on the sustainability of an air layer on superhydrophobic...

2010-01-01T23:59:59.000Z

40

Development of a shape memory alloy actuated biomimetic hydrofoil  

E-Print Network [OSTI]

mimicking aquatic animals with controlled oscillation frequencies of up to 1 Hz, with 1/2 Hz oscillation producing the largest useful amplitudes. Measurable force was generated when the biomimetic hydrofoil was defected underwater. The magnitude of the force...

Wilson, Larry Nixon

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Molecular biomimetics: nanotechnology and bionanotechnology using genetically engineered peptides  

Science Journals Connector (OSTI)

...whether for biotechnology or nanotechnology, should include protein...biomimetics protocols in nanotechnology, therefore, one uses solid-binding...of the new approach for nanotechnology is that inorganic surface-specific...applications, mostly in medicine, and summarize their potentials...

2009-01-01T23:59:59.000Z

42

Solution Self-Assembly of Sequence Specific Biomimetic Polymers  

E-Print Network [OSTI]

J. D. , In vitro self- assembly from a simple protein ofR. N. , Hierarchical Self-Assembly of a Biomimetic DiblockC. R. , Hierarchical self-assembly of F-actin and cationic

Murnen, Hannah

2012-01-01T23:59:59.000Z

43

Multiscale effects and capillary interactions in functional biomimetic surfaces for energy conversion and green engineering  

Science Journals Connector (OSTI)

...biomimetic surfaces for energy conversion and green engineering Michael Nosonovsky...discussed with the emphasis on energy and environmental (green) issues: new ways of...biomimetic surfaces for energy conversion and green engineering. | Biological...

2009-01-01T23:59:59.000Z

44

Nuclear diffractive structure functions at high energies  

E-Print Network [OSTI]

A future high-energy electron-ion collider would explore the non-linear weakly-coupled regime of QCD, and test the Color Glass Condensate (CGC) approach to high-energy scattering. Hard diffraction in deep inelastic scattering off nuclei will provide many fundamental measurements. In this work, the nuclear diffractive structure function F_{2,A}^D is predicted in the CGC framework, and the features of nuclear enhancement and suppression are discussed.

C. Marquet; H. Kowalski; T. Lappi; R. Venugopalan

2008-05-30T23:59:59.000Z

45

Surface and Structural Stabilities of Carbon Additives in High...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structural Stabilities of Carbon Additives in High Voltage Lithium Ion Batteries. Surface and Structural Stabilities of Carbon Additives in High Voltage Lithium Ion Batteries....

46

Radiation damage in biomimetic dye molecules for solar cells  

Science Journals Connector (OSTI)

A significant obstacle to organic photovoltaics is radiation damage either directly by photochemical reactions or indirectly via hot electrons. Such effects are investigated for biomimetic dye molecules for solar cells (phthalocyanines) and for a biological analog (the charge transfer protein cytochrome c). Both feature a central transition metal atom (or H 2 ) surrounded by nitrogen atoms. Soft x-ray absorption spectroscopy and photoelectron spectroscopy are used to identify three types of radiation-induced changes in the electronic structure of these molecules. (1) The peptidebonds along the backbone of the protein are readily broken while the nitrogen cage remains rather stable in phthalocyanines. This finding suggests minimizing peptide attachments to biologically inspired molecules for photovoltaic applications. (2) The metal atom in the protein changes its 3d electron configuration under irradiation. (3) The Fermi level E F shifts relative to the band gap in phthalocyanine films due to radiation-induced gap states. This effect has little influence on the optical absorption but it changes the lineup between the energy levels of the absorbing dye and the acceptor/donor electrodes that collect the charge carriers in a solar cell.

Peter L. Cook; Phillip S. Johnson; Xiaosong Liu; An-Li Chin; F. J. Himpsel

2009-01-01T23:59:59.000Z

47

Biomimetic Nanotechnology: A Powerful Means to address Global Challenges  

E-Print Network [OSTI]

Biomimetic nanotechnology is a prominent research area at the meeting place of life sciences with engineering and physics: it is a continuously growing field that deals with knowledge transfer from biology to nanotechnology. Biomimetic nanotechnology is a field that has the potential to substantially support successful mastering of major global challenges. The Millennium Project was commissioned by the United Nations Secretary-General in 2002 to develop a concrete action plan for the world to reverse the grinding poverty, hunger and disease affecting billions of people. It states 15 Global Challenges: sustainable development, water, population and resources, democratization, long-term perspectives, information technology, the rich-poor gap, health, capacity to decide, peace and conflict, status of women, transnational crime, energy, science and technology and global ethics. The possible contributions to master these challenges with the help of biomimetic nanotechnology will be discussed in detail.

Gebeshuber, Ille C

2010-01-01T23:59:59.000Z

48

Biomimetic spatial and temporal (4d) design and fabrication  

Science Journals Connector (OSTI)

We imagine the built environment of the future as a 'bio-hybrid machine for living in' that will sense and react to activities within the space in order to provide experiences and services that will elevate quality of life while coexisting seamlessly ... Keywords: 3D printing, 4D design, biomimetics, digital jacquard

Veronika Kapsali; Anne Toomey; Raymond Oliver; Lynn Tandler

2013-07-01T23:59:59.000Z

49

Supporting Creative Concept Generation by Engineering Students with Biomimetic Design  

E-Print Network [OSTI]

Supporting Creative Concept Generation by Engineering Students with Biomimetic Design Hyunmin the analogical transfer tools we developed affected engineering students in generating creative concepts. We of Mechanical and Industrial Engineering, University of Toronto 5 King's College Road, Toronto, ON, M5S 3G8

Shu, Lily H.

50

Spin structure in high energy processes: Proceedings  

SciTech Connect (OSTI)

This report contains papers as the following topics: Spin, Mass, and Symmetry; physics with polarized Z{sup 0}s; spin and precision electroweak physics; polarized electron sources; polarization phenomena in quantum chromodynamics; polarized lepton-nucleon scattering; polarized targets in high energy physics; spin dynamics in storage rings and linear accelerators; spin formalism and applications to new physics searches; precision electroweak physics at LEP; recent results on heavy flavor physics from LEP experiments using 1990--1992 data; precise measurement of the left-right cross section asymmetry in Z boson production by electron-positron collisions; preliminary results on heavy flavor physics at SLD; QCD tests with SLD and polarized beams; recent results from TRISTAN at KEK; recent B physics results from CLEO; searching for the H dibaryon at Brookhaven; recent results from the compton observatory; the spin structure of the deuteron; spin structure of the neutron ({sup 3}HE) and the Bjoerken sum rule; a consumer`s guide to lattice QCD results; top ten models constrained by b {yields} sy; a review of the Fermilab fixed target program; results from the D0 experiment; results from CDF at FNAL; quantum-mechanical suppression of bremsstrahlung; report from the ZEUS collaboration at HERA; physics from the first year of H1 at HERA, and hard diffraction. These papers have been cataloged separately elsewhere.

DePorcel, L.; Dunwoodie, C. [eds.

1994-12-01T23:59:59.000Z

51

Catalyst Structure-Performance Relationship Identified by High...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Identified by High-Throughput Operando Method: New Insight for Silica-Supported Catalyst Structure-Performance Relationship Identified by High-Throughput Operando Method: New...

52

The JCSG high-throughput structural biology pipeline  

Science Journals Connector (OSTI)

The Joint Center for Structural Genomics high-throughput structural biology pipeline has delivered more than 1000 structures to the community over the past ten years and has made a significant contribution to the overall goal of the NIH Protein Structure Initiative (PSI) of expanding structural coverage of the protein universe.

Elsliger, M.-A.

2010-09-30T23:59:59.000Z

53

Thermal stability of high temperature structural alloys  

SciTech Connect (OSTI)

High temperature structural alloys were evaluated for suitability for long term operation at elevated temperatures. The effect of elevated temperature exposure on the microstructure and mechanical properties of a number of alloys was characterized. Fe-based alloys (330 stainless steel, 800H, and mechanically alloyed MA 956), and Ni-based alloys (Hastelloy X, Haynes 230, Alloy 718, and mechanically alloyed MA 758) were evaluated for room temperature tensile and impact toughness properties after exposure at 750 C for 10,000 hours. Of the Fe-based alloys evaluated, 330 stainless steel and 800H showed secondary carbide (M{sub 23}C{sub 6}) precipitation and a corresponding reduction in ductility and toughness as compared to the as-received condition. Within the group of Ni-based alloys tested, Alloy 718 showed the most dramatic structure change as it formed delta phase during 10,000 hours of exposure at 750 C with significant reductions in strength, ductility, and toughness. Haynes 230 and Hastelloy X showed significant M{sub 23}C{sub 6} carbide precipitation and a resulting reduction in ductility and toughness. Haynes 230 was also evaluated after 10,000 hours of exposure at 850, 950, and 1050 C. For the 750--950 C exposures the M{sub 23}C{sub 6} carbides in Haynes 230 coarsened. This resulted in large reductions in impact strength and ductility for the 750, 850 and 950 C specimens. The 1050 C exposure specimens showed the resolution of M{sub 23}C{sub 6} secondary carbides, and mechanical properties similar to the as-received solution annealed condition.

Jordan, C.E.; Rasefske, R.K.; Castagna, A. [Lockheed Martin Corp., Schenectady, NY (United States)

1999-03-01T23:59:59.000Z

54

Synthesis, Structure, and Metalation of Two New Highly Porous...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Synthesis, Structure, and Metalation of Two New Highly Porous Zirconium Metal-Organic Frameworks Previous Next List William Morris, Boris Volosskiy, Selcuk Demir, Felipe Gndara,...

55

Identification of high angle structures controlling the geothermal...  

Open Energy Info (EERE)

high angle structures controlling the geothermal system at Rye Patch, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Paper: Identification of...

56

High Energy Nuclear Interactions and Structure of Elementary Particles  

Science Journals Connector (OSTI)

......research-article Articles High Energy Nuclear Interactions and Structure...role in extremely high energy interactions in cosmic...looked for in accelerator energy region. It is suggested...Theoretical Physics on nuclear forces. 6) S. Hayakawa......

Mituo Taketani; Yoichi Fujimoto

1965-01-01T23:59:59.000Z

57

Highly uniform step and terrace structures on  

E-Print Network [OSTI]

via moderate annealing in disilane. Atomic force microscopy and dark-field low-energy electron temperature of 1,373 K in disilane to avoid some of the complications of high-temperature H2 etching. Indeed

Pohl, Karsten

58

Biological and Biomimetic Low-Temperature Routes to Materials...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Review and Peer Evaluation Meeting es047morse2012p.pdf More Documents & Publications Nano-scale Composite Hetero-structures: Novel High Capacity Reversible Anodes for...

59

Robust, High-Throughput Analysis of Protein Structures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Robust, High-Throughput Analysis of Protein Structures Print Robust, High-Throughput Analysis of Protein Structures Print Scientists have developed a fast and efficient way to determine the structure of proteins, shortening a process that often takes years into a matter of days. The Structurally Integrated BiologY for Life Sciences (SIBYLS) beamline at the ALS has implemented the world's highest-throughput biological-solution x-ray scattering beamline enabling genomic-scale protein-structure characterization. Coupling brilliant x rays from one of the superconducting bend magnets at the ALS to liquid-handling robotics has enabled the collection of 96 samples in 4 hours. Importantly, the sample format and the amount of material required are practical for most biological problems. The beamline's high-throughput capability is set to have a large impact on many fields that require genomic-scale information, such as Berkeley Lab's bioenergy efforts and cancer biology studies.

60

Structural Integrity Assessment of Very High Temperature Nuclear...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structural Integrity Assessment of Very High Temperature Nuclear Reactor Core Components Oct 20 2014 09:00 AM - 10:00 AM Gyanendar Singh, The University of Minnesota, Minneapolis...

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Formation of Biomimetic Porous Calcium Phosphate Coatings on Surfaces of Polyethylene/Zinc Stearate Blends  

E-Print Network [OSTI]

Formation of Biomimetic Porous Calcium Phosphate Coatings on Surfaces of Polyethylene/Zinc Stearate phosphate coating, polyethylene Abstract Studies were undertaken investigating improvements presented in this paper concentrated on adding zinc stearate to polyethylene. Important potential benefits

Drelich, Jaroslaw W.

62

Characterization and modeling of a shape memory allow actuated biomimetic vehicle  

E-Print Network [OSTI]

The development of a biomimetic active hydrofoil that utilizes Shape Memory Alloy (SMA) actuator technology is presented herein. This work is the first stage prototype of a vehicle that will consist of many actuated body segments. The current work...

Garner, Luke Jay

1999-01-01T23:59:59.000Z

63

Biomimetic oscillating foil propulsion to enhance underwater vehicle agility and maneuverability  

E-Print Network [OSTI]

Inspired by the swimming abilities of marine animals, this thesis presents "Finnegan the RoboTurtle", an autonomous underwater vehicle (AUV) powered entirely by four flapping foils. Biomimetic actuation is shown to produce ...

Licht, Stephen Carl

2008-01-01T23:59:59.000Z

64

Principles of goal-directed spatial robot navigation in biomimetic models  

Science Journals Connector (OSTI)

...exploit global wind currents to minimize energy expenditure...fundamental challenges. An animal...30]. Its implementation was driven by...significant challenges to biomimetic...Relevant to the challenge of encoding...

2014-01-01T23:59:59.000Z

65

Design of a biomimetic pectoral fin joint in an artificial fish  

E-Print Network [OSTI]

A biomimetic design of the muscle joint in a pectoral fish fin was produced based on comparisons with four design models. All four design models consisted of a mechanical joint connection and incorporated the functional ...

Pea, Vanessa, 1982-

2004-01-01T23:59:59.000Z

66

Studies toward biomimetic claisen condensation using nucleic acid templates and ribozyme catalysis  

E-Print Network [OSTI]

Many different experimental approaches were attempted to achieve carbon-carbon bond formation by nucleic acid template-directed reactions and ribozyme catalysis as potential lipid synthesizing machineries in the RNA world. A novel biomimetic...

Ryu, Youngha

2005-08-29T23:59:59.000Z

67

Polymers with Tailored Electronic Structure for High Capacity Lithium  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Polymers with Tailored Electronic Structure for High Capacity Lithium Polymers with Tailored Electronic Structure for High Capacity Lithium Battery Electrodes Title Polymers with Tailored Electronic Structure for High Capacity Lithium Battery Electrodes Publication Type Journal Article Year of Publication 2011 Authors Liu, Gao, Shidi Xun, Nenad Vukmirovic, Xiangyun Song, Paul Olalde-Velasco, Honghe Zheng, Vince S. Battaglia, Linwang Wang, and Wanli Yang Journal Advanced Materials Volume 23 Start Page 4679 Issue 40 Pagination 4679 - 4683 Date Published 10/2011 Keywords binders, conducting polymers, density funcational theory, lithium batteries, X-ray spectroscopy Abstract A conductive polymer is developed for solving the long-standing volume change issue in lithium battery electrodes. A combination of synthesis, spectroscopy and simulation techniques tailors the electronic structure of the polymer to enable in situ lithium doping. Composite anodes based on this polymer and commercial Si particles exhibit 2100 mAh g-1 in Si after 650 cycles without any conductive additive.

68

Conversion of methane to higher hydrocarbons (Biomimetic catalysis of the conversion of methane to methanol). Final report  

SciTech Connect (OSTI)

In addition to inorganic catalysts that react with methane, it is well-known that a select group of aerobic soil/water bacteria called methanotrophs can efficiently and selectively utilize methane as the sole source of their energy and carbon for cellular growth. The first reaction in this metabolic pathway is catalyzed by the enzyme methane monooxygenase (MMO) forming methanol. Methanol is a technology important product from this partial oxidation of methane since it can be easily converted to liquid hydrocarbon transportation fuels (gasoline), used directly as a liquid fuel or fuel additive itself, or serve as a feedstock for chemicals production. This naturally occurring biocatalyst (MMO) is accomplishing a technologically important transformation (methane directly to methanol) for which there is currently no analogous chemical (non-biological) process. The authors approach has been to use the biocatalyst, MMO, as the initial focus in the development of discrete chemical catalysts (biomimetic complexes) for methane conversion. The advantage of this approach is that it exploits a biocatalytic system already performing a desired transformation of methane. In addition, this approach generated needed new experimental information on catalyst structure and function in order to develop new catalysts rationally and systematically. The first task is a comparative mechanistic, biochemical, and spectroscopic investigation of MMO enzyme systems. This work was directed at developing a description of the structure and function of the catalytically active sites in sufficient detail to generate a biomimetic material. The second task involves the synthesis, characterization, and chemical reactions of discrete complexes that mimic the enzymatic active site. These complexes were synthesized based on their best current understanding of the MMO active site structure.

Watkins, B.E.; Taylor, R.T.; Satcher, J.H. [and others

1993-09-01T23:59:59.000Z

69

A High-resolution Method for Realistic Detonation Structure Simulation  

E-Print Network [OSTI]

A High-resolution Method for Realistic Detonation Structure Simulation R. Deiterding Abstract. Detonation simulation is one of the computationally most challenging hyperbolic problems of practical. Introduction Detonations are shock-induced combustion waves that internally consist of a dis- continuous

Deiterding, Ralf

70

Gravi++: Interactive Information Visualization of Highly Structured Temporal Data  

E-Print Network [OSTI]

tasks or computer tomography visualizations. In the field of medical treatment planning different kindsGravi++: Interactive Information Visualization of Highly Structured Temporal Data Klaus Hinum1, Vienna University of Technology Vienna, Austria, http://ieg.ifs.tuwien.ac.at/projects/in2vis/ Abstract

71

Ground-State Structures of Ice at High-Pressures  

E-Print Network [OSTI]

\\textit{Ab initio} random structure searching based on density functional theory is used to determine the ground-state structures of ice at high pressures. Including estimates of lattice zero-point energies, ice is found to adopt three novel crystal phases. The underlying sub-lattice of O atoms remains similar among them, and the transitions can be characterized by reorganizations of the hydrogen bonds. The symmetric hydrogen bonds of ice X and $Pbcm$ are initially lost as ice transforms to structures with symmetries $Pmc2_1$ (800 - 950 GPa) and $P2_1$ (1.17 TPa), but they are eventually regained at 5.62 TPa in a layered structure $C2/m$. The $P2_1 \\rightarrow C2/m$ transformation also marks the insulator-to-metal transition in ice, which occurs at a significantly higher pressure than recently predicted.

McMahon, Jeffrey M

2011-01-01T23:59:59.000Z

72

The high-throughput protein-to-structure pipeline at SECSG  

Science Journals Connector (OSTI)

The high-throughput crystal structure determination pipeline at Southeast Collaboratory for Structural Genomics, a pilot center of the National Institutes of Health Protein Structure Initiative, is described.

Liu, Z.-J.

2005-05-26T23:59:59.000Z

73

Dielectric-Lined High-Gradient Accelerator Structure  

SciTech Connect (OSTI)

Rectangular particle accelerator structures with internal planar dielectric elements have been studied, with a view towards devising structures with lower surface fields for a given accelerating field, as compared with structures without dielectrics. Success with this concept is expected to allow operation at higher accelerating gradients than otherwise on account of reduced breakdown probabilities. The project involves studies of RF breakdown on amorphous dielectrics in test cavities that could enable high-gradient structures to be built for a future multi-TeV collider. The aim is to determine what the limits are for RF fields at the surfaces of selected dielectrics, and the resulting acceleration gradient that could be achieved in a working structure. The dielectric of principal interest in this study is artificial CVD diamond, on account of its advertised high breakdown field ({approx}2 GV/m for dc), low loss tangent, and high thermal conductivity. Experimental studies at mm-wavelengths on materials and structures for achieving high acceleration gradient were based on the availability of the 34.3 GHz third-harmonic magnicon amplifier developed by Omega-P, and installed at the Yale University Beam Physics Laboratory. Peak power from the magnicon was measured to be about 20 MW in 0.5 {micro}s pulses, with a gain of 54 dB. Experiments for studying RF high-field effects on CVD diamond samples failed to show any evidence after more than 10{sup 5} RF pulses of RF breakdown up to a tangential surface field strength of 153 MV/m; studies at higher fields were not possible due to a degradation in magnicon performance. A rebuild of the tube is underway at this writing. Computed performance for a dielectric-loaded rectangular accelerator structure (DLA) shows highly competitive properties, as compared with an existing all-metal structure. For example, comparisons were made of a DLA structure having two planar CVD diamond elements with a all-metal CERN structure HDS operating at 30 GHz. It was shown that the ratio of maximum surface electric field to accelerating field at the metal wall is only 0.35-0.4 for DLA, much smaller than the value 2.2 for HDS; and the ratio of surface magnetic field to accelerating field is 3.0 mA/V for DLA, compared with 3.45 mA/V for HDS. These values bode well for DLA in helping to avoid breakdown and to reducing pulsed surface heating and fatigue. The shunt impedance is found to be 160-175 M{Omega}/m for DLA, as compared to 99 M{Omega}/m for HDS. Conclusions are reached from this project that CVD diamond appears promising as a dielectric with a high threshold for RF breakdown, and that rectangular accelerator structures can be devised using planar CVD diamond elements that could be operated at higher acceleration gradients with low probability of RF breakdown, as compared with corresponding all-metallic structures.

Jay L. Hirshfield

2012-04-24T23:59:59.000Z

74

Nano-scale Composite Hetero-structures: Novel High Capacity Reversible...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Nano-scale Composite Hetero-structures: Novel High Capacity Reversible Anodes for Lithium-ion Batteries Nano-scale Composite Hetero-structures: Novel High Capacity Reversible...

75

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor is fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a ``notepad`` configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The notepad capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density. 5 figs.

Barbee, T.W. Jr.; Johnson, G.W.; O`Brien, D.W.

1995-05-09T23:59:59.000Z

76

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a "notepad" configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The "notepad" capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density.

Barbee, Jr., Troy W. (Palo Alto, CA); Johnson, Gary W. (Livermore, CA); O'Brien, Dennis W. (Livermore, CA)

1995-01-01T23:59:59.000Z

77

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor is described which is fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a ``notepad`` configuration composed of 200--300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The ``notepad`` capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density. 5 figs.

Barbee, T.W. Jr.; Johnson, G.W.; O`Brien, D.W.

1996-01-23T23:59:59.000Z

78

High performance capacitors using nano-structure multilayer materials fabrication  

DOE Patents [OSTI]

A high performance capacitor fabricated from nano-structure multilayer materials, such as by controlled, reactive sputtering, and having very high energy-density, high specific energy and high voltage breakdown. The multilayer capacitors, for example, may be fabricated in a "notepad" configuration composed of 200-300 alternating layers of conductive and dielectric materials so as to have a thickness of 1 mm, width of 200 mm, and length of 300 mm, with terminals at each end of the layers suitable for brazing, thereby guaranteeing low contact resistance and high durability. The "notepad" capacitors may be stacked in single or multiple rows (series-parallel banks) to increase the voltage and energy density.

Barbee, Jr., Troy W. (Palo Alto, CA); Johnson, Gary W. (Livermore, CA); O'Brien, Dennis W. (Livermore, CA)

1996-01-01T23:59:59.000Z

79

Impact of Electric Industry Structure on High Wind Penetration Potential  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

273 273 July 2009 Impact of Electric Industry Structure on High Wind Penetration Potential M. Milligan and B. Kirby National Renewable Energy Laboratory R. Gramlich and M. Goggin American Wind Energy Association National Renewable Energy Laboratory 1617 Cole Boulevard, Golden, Colorado 80401-3393 303-275-3000 * www.nrel.gov NREL is a national laboratory of the U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Operated by the Alliance for Sustainable Energy, LLC Contract No. DE-AC36-08-GO28308 Technical Report NREL/TP-550-46273 July 2009 Impact of Electric Industry Structure on High Wind Penetration Potential M. Milligan and B. Kirby National Renewable Energy Laboratory R. Gramlich and M. Goggin American Wind Energy Association

80

Extending Resonant Diffraction to Very High Energies for Structural Studies  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Tuning the Collective Properties of Artificial Nanoparticle Supercrystals Tuning the Collective Properties of Artificial Nanoparticle Supercrystals The Workings of a Key Staph Enzyme and How to Block It Simple Lithium Is Good For Many Surprises Science Highlights Archives: 2013 | 2012 | 2011 | 2010 2009 | 2008 | 2007 | 2006 2005 | 2004 | 2003 | 2002 2001 | 2000 | 1998 | Subscribe to APS Science Highlights rss feed Extending Resonant Diffraction to Very High Energies for Structural Studies of Complex Materials MARCH 15, 2011 Bookmark and Share Systems investigated using the high-energy resonant PDF method: the (dis)ordered phases of Cu3Au, PtPd random-alloy and core-shell nanoparticles (upper part), and the BiFeO3 perovskite structure (undistorted and distorted; lower part). Researchers utilizing the U.S. Department of Energy's Argonne Advanced

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

High Precision Geophysics & Detailed Structural Exploration & Slim Well  

Open Energy Info (EERE)

Precision Geophysics & Detailed Structural Exploration & Slim Well Precision Geophysics & Detailed Structural Exploration & Slim Well Drilling Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title High Precision Geophysics & Detailed Structural Exploration & Slim Well Drilling Project Type / Topic 1 Recovery Act: Geothermal Technologies Program Project Type / Topic 2 Validation of Innovative Exploration Technologies Project Description Existing geologic data show that the basalt has been broken by complex intersecting fault zones at the hot springs. Natural state hot water flow patterns in the fracture network will be interpreted from temperature gradient wells and then tested with moderate depth core holes. Production and injection well tests of the core holes will be monitored with an innovative combination of Flowing Differential Self-Potential (FDSP) and resistivity tomography surveys. The cointerpretation of all these highly detailed geophysical methods sensitive to fracture permeability patterns and water flow during the well tests will provide unprecedented details on the structures and flow in a shallow geothermal aquifer and support effective development of the low temperature reservoir and identification of deep up flow targets.

82

A High-Resolution Solution of the Ribosome Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Resolution Solution of the Ribosome Structure Resolution Solution of the Ribosome Structure Researchers using high-brilliance x-ray beams from the Structural Biology Center undulator beamline 19-ID at the Advanced Photon Source have obtained a detailed picture of how the ribosome allows accurate translation of the genetic code. What they found offers new information on how proteins are formed and how they create the chain of proteins that make up an organism. The rRNA of the 30S ribosomal subunit, as determined at the Structural Biology Center. The parts of the rRNA as shown here are: messenger RNA (purple), head (green), central domain ((blue), and body (red) with H44 in cyan. The gold ribbons represent the binding from the anticodon stem loop. Left: The rRNA of the 30S ribosomal subunit, as determined at the Structural Biology Center. The parts of the rRNA as shown here are: messenger RNA (purple), head (green), central domain ((blue), and body (red) with H44 in cyan. The gold ribbons represent the binding from the anticodon stem loop. (Courtesy of the Medical Research Council Laboratory of Molecular Biology, UK)

83

Robotics and Autonomous Systems 30 (2000) 515 Architectures for a biomimetic hexapod robot  

E-Print Network [OSTI]

Robotics and Autonomous Systems 30 (2000) 5­15 Architectures for a biomimetic hexapod robot Fred Institute, 405 North Mathews, Urbana, IL 61801, USA Abstract This paper describes a six-legged robot based on the features of an agile insect, the American cockroach, Periplaneta americana. The robot is designed

Nelson, Mark E.

84

Comparison study of biomimetic strontium-doped calcium phosphate coatings by electrochemical deposition and air plasma  

E-Print Network [OSTI]

Comparison study of biomimetic strontium-doped calcium phosphate coatings by electrochemical April 2012 ? Springer Science+Business Media, LLC 2012 Abstract In this study, strontium-doped calcium of the strontium-doped calcium phosphate coatings were evaluated using bone cell culture using MC3T3-E1 osteoblast

Meng, Yizhi

85

Fish and robots swimming together: attraction towards the robot demands biomimetic locomotion  

Science Journals Connector (OSTI)

...research-article Research articles 1004 29 69 16 Fish and robots swimming together: attraction...The integration of biomimetic robots in a fish school may enable a better understanding...engineered member. Here, we analyse a robotic fish and individual golden shiners (Notemigonus...

Stefano Marras; Maurizio Porfiri

2012-01-01T23:59:59.000Z

86

Heliostat Field Optimization: A New Computationally Efficient Model and Biomimetic Layout  

E-Print Network [OSTI]

Heliostat Field Optimization: A New Computationally Efficient Model and Biomimetic Layout Corey J for heliostat field layout optimization are introduced. The model, described and validated herein, includes & blocking, aberration and atmospheric attenuation. The model is based on a discretization of the heliostats

87

Nano-sized manganese oxides as biomimetic catalysts for water oxidation in artificial photosynthesis: a review  

Science Journals Connector (OSTI)

...review-article Review articles 1004 30 36 15 Nano-sized manganese oxides as biomimetic...of about approximately 0.5 nm. Thus, nano-sized manganese compounds might be good...particles. In this paper, we focus on nano-sized manganese oxides as functional...

2012-01-01T23:59:59.000Z

88

Structure of high-burnup-fuel Zircaloy cladding. [PWR; BWR  

SciTech Connect (OSTI)

Zircaloy cladding from high-burnup (> 20 MWd/kg U) fuel rods in light-water reactors is characterized by a high density of irradiation-induced defects (RID), compositional changes (e.g., oxygen and hydrogen uptake) associated with in-service corrosion, and geometrical changes produced by creepdown, bowing, and irradiation-induced growth. During a reactor power transient, the cladding is subject to localized stress imposed by thermal expansion of the cracked fuel pellets and to mechanical constraints imposed by pellet-cladding friction. As part of a program to provide a better understanding of brittle-type failure of Zircaloy fuel cladding by pellet-cladding interaction (PCI) phenomenon, the stress-rupture properties and microstructural characteristics of high-burnup spent fuel cladding have been under investigation. This paper reports the results of the microstructural examinations by optical microscopy, scanning (SEM), 100-keV transmission (TEM), and 1 MeV high-voltage (HVEM) electron microscopies of the fractured spent fuel cladding with a specific empahsis on a correlation of the structural characteristics with the fracture behavior.

Chung, H.M.

1983-06-01T23:59:59.000Z

89

The effect of interface microstructure on interfacial shear strength for osteochondral scaffolds based on biomimetic design and 3D printing  

Science Journals Connector (OSTI)

Abstract Interface integration between chondral phase and osseous phase is crucial in engineered osteochondral scaffolds. However, the integration was poorly understood and commonly failed to meet the need of osteochondral scaffolds. In this paper, a biphasic polyethylene glycol (PEG)/?-tricalcium phosphate (?-TCP) scaffold with enhanced interfacial integration was developed. The chondral phase was a PEG hydrogel. The osseous phase was a ?-TCP ceramic scaffold. The PEG hydrogel was directly cured on the ceramic interface layer by layer to fabricate osteochondral scaffolds by 3D printing technology. Meanwhile, a series of interface structure were designed with different interface pore area percentages (0/10/20/30/40/50/60%), and interfacial shear test was applied for interface structure optimization (n=6 samples/group). The interfacial shear strength of 30% pore area group was nearly three folds improved compared with that of 0% pore area percentage group, and more than fifty folds improved compared with that of traditional integration (5.910.59kPa). In conclusion, the biomimetic PEG/?-TCP scaffolds with interface structure enhanced integration show promising potential application for osteochondral tissue engineering.

Weijie Zhang; Qin Lian; Dichen Li; Kunzheng Wang; Dingjun Hao; Weiguo Bian; Zhongmin Jin

2015-01-01T23:59:59.000Z

90

A soft body under-actuated approach to multi degree of freedom biomimetic robots: A stingray example  

E-Print Network [OSTI]

In this paper we present a new application of the methodology our group is developing to design and prototype under-actuated biomimetic robots by determining appropriate body material property distributions. When excited, ...

Valdivia y Alvarado, Pablo

91

Ray-tracing for complex astrophysical high-opacity structures  

E-Print Network [OSTI]

We present a ray-tracing technique for radiative transfer modeling of complex three-dimensional (3D) structures which include dense regions of high optical depth like in dense molecular clouds, circumstellar disks, envelopes of evolved stars, and dust tori around active galactic nuclei. The corresponding continuum radiative transfer problem is described and the numerical requirements for inverse 3D density and temperature modeling are defined. We introduce a relative intensity and transform the radiative transfer equation along the rays to solve machine precision problems and to relax strong gradients in the source term. For the optically thick regions where common ray-tracers are forced to perform small trace steps, we give two criteria for making use of a simple approximative solver crossing the optically thick region quickly. Using an example of a density structure with optical depth changes of 6 orders of magnitude and sharp temperature variations, we demonstrate the accuracy of the proposed scheme using a common 5th-order Runge-Kutta ray-tracer with adaptive step size control. In our test case, the gain in computational speed is about a factor of 870. The method is applied to calculate the temperature distribution within a massive molecular cloud core for different boundary conditions for the radiation field.

J. Steinacker; A. Bacmann; Th. Henning

2006-03-17T23:59:59.000Z

92

High-K isomers and rotational structures in W174  

Science Journals Connector (OSTI)

High-spin states in W174 (Z = 74) have been populated using the reaction Te128(Ti50, 4n)W174 at beam energies of 215 and 225 MeV. The Gammasphere array was used to detect the ? rays emitted by the evaporation residues. Four previously known collective band structures have been extended, and 16 new rotational sequences observed. Two are built upon isomeric states, one corresponding to a two-quasiparticle K = 8 isomer, the other to a four-quasiparticle K = 12 isomer, with the latter exhibiting strong K-violating ?K=12 decays to the ground state band. Nucleonic configurations for the two- and four-quasiparticle excitations are proposed, and Woods-Saxon cranking calculations are presented to understand the rotational structures. Decay mechanisms of multi-quasiparticle K isomers are discussed in terms of the prevalent phenomenological models, with special emphasis on ?-tunneling calculations. Surprisingly, the latter underpredict the decay hindrance for the K = 12 isomer by three orders of magnitude, unlike all other isomer decays in this mass region.

S. K. Tandel; P. Chowdhury; E. H. Seabury; I. Ahmad; M. P. Carpenter; S. M. Fischer; R. V. F. Janssens; T. L. Khoo; T. Lauritsen; C. J. Lister; D. Seweryniak; Y. R. Shimizu

2006-04-11T23:59:59.000Z

93

Structural and Aerodynamic Interaction Computational Tool for Highly Reconfigurable Wings  

E-Print Network [OSTI]

of the aerospace industry, and a reconfigurable wing is a significant element of a morphing aircraft. This thesis develops two tools for analyzing wing configurations with multiple geometric degrees-of-freedom: the structural tool and the aerodynamic and structural...

Eisenbeis, Brian Joseph

2011-10-21T23:59:59.000Z

94

Neural network definitions of highly predictable protein secondary structure classes  

SciTech Connect (OSTI)

We use two co-evolving neural networks to determine new classes of protein secondary structure which are significantly more predictable from local amino sequence than the conventional secondary structure classification. Accurate prediction of the conventional secondary structure classes: alpha helix, beta strand, and coil, from primary sequence has long been an important problem in computational molecular biology. Neural networks have been a popular method to attempt to predict these conventional secondary structure classes. Accuracy has been disappointingly low. The algorithm presented here uses neural networks to similtaneously examine both sequence and structure data, and to evolve new classes of secondary structure that can be predicted from sequence with significantly higher accuracy than the conventional classes. These new classes have both similarities to, and differences with the conventional alpha helix, beta strand and coil.

Lapedes, A. [Los Alamos National Lab., NM (United States)]|[Santa Fe Inst., NM (United States); Steeg, E. [Toronto Univ., ON (Canada). Dept. of Computer Science; Farber, R. [Los Alamos National Lab., NM (United States)

1994-02-01T23:59:59.000Z

95

Exploring electronic structure through high-resolution hard x...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

on the data quality are triggering continuous developments of the theoretical electronic structure calculations to support and strengthen the data interpretation. Here,...

96

Biomimetic amplification of nanoparticle homing to tumors Derfus, Meng Yang, Robert M. Hoffman, Sangeeta Bhatia, Michael J. Sailor, and Erkki Ruoslahti  

E-Print Network [OSTI]

Biomimetic amplification of nanoparticle homing to tumors Derfus, Meng Yang, Robert M. Hoffman.pnas.org/misc/reprints.shtml To order reprints, see: Notes: #12;Biomimetic amplification of nanoparticle homing to tumors Dmitri, November 22, 2006 (sent for review November 13, 2006) Nanoparticle-based diagnostics and therapeutics hold

Bhatia, Sangeeta

97

Phosphate bonded structural products from high volume wastes  

DOE Patents [OSTI]

A method to produce structural products from benign waste is provided comprising mixing pretreated oxide with phosphoric acid to produce an acid solution, mixing the acid solution with waste particles to produce a slurry, and allowing the slurry to cure. The invention also provides for a structural material comprising waste particles enveloped by an inorganic binder. 1 fig.

Singh, D.; Wagh, A.S.

1998-12-08T23:59:59.000Z

98

Nanosheet-structured LiV3O8 with high capacity and excellent...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Highly stable LiV3O8 with a nanosheet-structure was successfully prepared using polyethylene glycol (PEG) polymer in the precursor solution as the structure modifying agent,...

99

Spatial association between the locations of roots and water flow paths in highly structured soil  

E-Print Network [OSTI]

Considerable evidence exists that the majority of low tension water flow through highly structured clayey soil occurs in a small fraction of total pore space and that the flow paths converge as depth increases. In structured clayey soils, water...

Gardiner, Nathan Thomas

2005-02-17T23:59:59.000Z

100

Integrating Structure Control over Multiple Length Scales in Porous High  

E-Print Network [OSTI]

temperature catalytic applications for their high surface area and low flow resistance in combination with thermal and chemical stability. We have developed a bottom-up approach to functional, porous, high results in three-dimensionally interconnected, high-temperature ceramic materials functionalized with well

Gruner, Sol M.

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Intergrating Magnetotellurics, Soil Gas Geochemistry and Structural Analysis to Identify Hidden, High Enthalpy, Extensional Geothermal Systems  

Broader source: Energy.gov [DOE]

Intergrating Magnetotellurics, Soil Gas Geochemistry and Structural Analysis to Identify Hidden, High Enthalpy, Extensional Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado.

102

Nano-structured Organic-Metal Interface for High Efficiency Organic Solar Cells  

Science Journals Connector (OSTI)

High bimolecular recombination has been identified as a performance limiting parameter in organic solar cells. To counter this issue, we introduce a structured-junction device...

Pandey, Ajay K; Aljada, Muhsen; Velusamy, M; Burn, Paul L; Meredith, Paul

103

Structural Health Monitoring by High-Resolution Brillouin-based Strain Measurements  

Science Journals Connector (OSTI)

The feasibility for high-resolution structural health monitoring based on fiber-optic frequency-domain Brillouin strain sensing is experimentally demonstrated. An iterative...

Bernini, Romeo; Minardo, Aldo; Zeni, Luigi

104

Structure Analysis of a Precipitate Phase in an Ni-Rich High...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape Memory Alloy. Structure Analysis of a Precipitate Phase in an Ni-Rich High Temperature NiTiHf Shape...

105

Structural Engineering Seminar Series Ultra-High Performance Concrete Construction  

E-Print Network [OSTI]

performance and resistance against environmental degradation. UHPC is defined as a concrete fiber composite for Our Future Infrastructure? by Kay Wille, PhD Assistant Professor, Civil and Environmental Engineering and conference proceedings. It has been used in various forms in structural and architectural elements, as a bond

Kamat, Vineet R.

106

Towards Automatic Synthesis of High-Performance Codes for Electronic Structure Calculations: Data  

E-Print Network [OSTI]

Towards Automatic Synthesis of High-Performance Codes for Electronic Structure Calculations: Data as a set of tensor contractions and arise in electronic structure calculations. This paper provides focus is electronic structure calculations, as exemplified by coupled cluster methods, where many

Ramanujam, J. "Ram"

107

Towards Automatic Synthesis of High-Performance Codes for Electronic Structure Calculations: Data  

E-Print Network [OSTI]

Towards Automatic Synthesis of High-Performance Codes for Electronic Structure Calculations: Data. These computations are expressible as a set of tensor contractions and arise in electronic structure calculations and computational physics. The domain of our focus is electronic structure calculations, as exemplified by coupled

Baumgartner, Gerald

108

Cryogenic deformation of high temperature superconductive composite structures  

DOE Patents [OSTI]

An improvement in a process of preparing a composite high temperature oxide superconductive wire is provided and involves conducting at least one cross-sectional reduction step in the processing preparation of the wire at sub-ambient temperatures.

Roberts, Peter R. (Groton, MA); Michels, William (Brookline, MA); Bingert, John F. (Jemez Springs, NM)

2001-01-01T23:59:59.000Z

109

Robust, High-Throughput Analysis of Protein Structures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

of even the simplest of organisms. Hura et al. have developed a high-throughput protein pipeline that could expedite protein analysis by trading atomic-level detail for speed and...

110

High Resolution/High Fidelity Seismic Imaging and Parameter Estimation for Geological Structure and Material Characterization  

SciTech Connect (OSTI)

In this project, we develop new theories and methods for multi-domain one-way wave-equation based propagators, and apply these techniques to seismic modeling, seismic imaging, seismic illumination and model parameter estimation in 3D complex environments. The major progress of this project includes: (1) The development of the dual-domain wave propagators. We continue to improve the one-way wave-equation based propagators. Our target is making propagators capable of handling more realistic velocity models. A wide-angle propagator for transversely isotropic media with vertically symmetric axis (VTI) has been developed for P-wave modeling and imaging. The resulting propagator is accurate for large velocity perturbations and wide propagation angles. The thin-slab propagator for one-way elastic-wave propagation is further improved. With the introduction of complex velocities, the quality factors Qp and Qs have been incorporated into the thin-slab propagator. The resulting viscoelastic thin-slab propagator can handle elastic-wave propagation in models with intrinsic attenuations. We apply this method to complex models for AVO modeling, random media characterization and frequency-dependent reflectivity simulation. (2) Exploring the Information in the Local Angle Domain. Traditionally, the local angle information can only be extracted using the ray-based method. We develop a wave-equation based technique to process the local angle domain information. The approach can avoid the singularity problem usually linked to the high-frequency asymptotic method. We successfully apply this technique to seismic illumination and the resulting method provides a practical tool for three-dimensional full-volume illumination analysis in complex structures. The directional illumination also provides information for angle-domain imaging corrections. (3) Elastic-Wave Imaging. We develop a multicomponent elastic migration method. The application of the multicomponent one-way elastic propagator and the wide-angle correction preserve more dynamic information carried by the elastic waves. The vector imaging condition solves the polarization problem of converted wave imaging. Both P-P and P-S images can be calculated. We also use converted waves to improve the image of steep sub-salt structures. The synthetic data for the SEG/EAGE salt model are migrated with a generalized screen algorithm and for the converted PSS-wave path. All the sub-salt faults are properly imaged.

Ru-Shan Wu, Xiao-Bi Xie, Thorne Lay

2005-06-06T23:59:59.000Z

111

Electronic-Structure of High-Temperature Superconductors  

E-Print Network [OSTI]

, and for the corresponding metal atoms in related high-temperature superconductors. These peaks should be observable in electron energy-loss spectroscopy's and 6nal-state photoemission spectrosco- py 20 The calculated valences d,n are again given in Table II. Notice... again neatly cancel in YBa2Cu307. In summary, we have calculated the electronic struc- tures of the most typical members of the two known classes of high-temperature superconductors. The present results, obtained with a simple tight-binding model...

RICHERT, BA; Allen, Roland E.

1988-01-01T23:59:59.000Z

112

Superhydrophobic and superhydrophilic plant surfaces: an inspiration for biomimetic materials  

Science Journals Connector (OSTI)

...hierarchical structure has been developed by thermal evaporation and subsequent self-assembly...lotus leaf has been contaminated with Sudan red; a water droplet rolling over...Barthlott, W. Koch, K. Submitted. Thermal evaporation of multi-component waxes...

2009-01-01T23:59:59.000Z

113

L&E - high efficiency lighting for parking structure | The Better Buildings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

structure structure Activities Technology Solutions Teams Lighting & Electrical Space Conditioning Plug & Process Loads Food Service Refrigeration Laboratories Energy Management & Information Systems Public Sector Teams Market Solutions Teams Adopt high-efficiency lighting for your parking structure Parking structures and garages are typically lighted by older HID lighting technology without any energy-saving controls. The latest high-efficiency alternatives with energy-saving controls-including light-emitting diode (LED), induction, and fluorescent technology options-can save building owners over 40% on their parking lot lighting bills while delivering additional benefits such as better-lighted spaces. The Lighting & Electrical team developed a performance specification that

114

High spin band structures in doubly-odd $^{194}$Tl  

E-Print Network [OSTI]

The high-spin states in odd-odd $^{194}$Tl nucleus have been studied by populating them using the $^{185,187}$Re($^{13}$C, xn) reactions at 75 MeV of beam energy. $\\gamma-\\gamma$ coincidence measurement has been performed using the INGA array with a digital data acquisition system to record the time stamped data. Definite spin-parity assignment of the levels was made from the DCO ratio and the IPDCO ratio measurements. The level scheme of $^{194}$Tl has been extended up to 4.1 MeV in excitation energy including 19 new gamma ray transitions. The $\\pi h_{9/2} \\otimes \

H. Pai; G. Mukherjee; S. Bhattacharyya; M. R. Gohil; T. Bhattacharjee; C. Bhattacharya; R. Palit; S. Saha; J. Sethi; T. Trivedi; Shital Thakur; B. S. Naidu; S. K. Jadav; R. Donthi; A. Goswami; S. Chanda

2012-01-31T23:59:59.000Z

115

Porous MetalOrganic Frameworks for Heterogeneous Biomimetic Catalysis  

Science Journals Connector (OSTI)

Homogeneous artificial metalloporphyrins can undergo catalytic deactivation via suicidal self-oxidation, which lowers their catalytic activity and sustainability relative to their counterparts in Nature. ... The 3D structure of [Zn2(HCOO)(FeIII(H2O)-TCPP)]guest (7) is made up of layered network of FeIII-TCPP connected with binuclear Zn2(COO)4 paddle-wheel SBUs, and further linked by formate pillars to homogeneously coordinate with Zn2(COO)4 SBUs (Figure 4a). ... pillar linker DPNI to form a three-dimensional porous structure. ...

Min Zhao; Sha Ou; Chuan-De Wu

2014-02-06T23:59:59.000Z

116

Variable temperature, relative humidity ,,0%100%..., and liquid neutron reflectometry sample cell suitable for polymeric and biomimetic materials  

E-Print Network [OSTI]

Variable temperature, relative humidity ,,0%­100%..., and liquid neutron reflectometry sample cell , and bulk liquid neutron reflectometry sample cell suitable for the study of polymeric and biomimetic. This permits the study, by neutron reflectometry, of samples that are intrinsically unstable in bulk water

Barrett, Christopher

117

Magnetosheath conditions and magnetopause structure for high magnetic shear  

Science Journals Connector (OSTI)

The supersonic solar wind - Earth's magnetosphere coupling plays the main role in the solar wind energy, momentum and mass input into the magnetosphere. A new dynamic model of the magnetic field in the coupled solar wind magnetosphere system taking into account bow shock formation is considered. The solution for plasma flow and magnetic field upstream and downstream the bow shock was obtained in kinematic approximation. The magnetic field near the magnetopause was compared with those obtained in terms of subsonic solar wind - magnetosphere interaction. For typical magnetosheath conditions, the former is about twice the latter. The magnetic field near the magnetopause is formed due to mutual diffusion of the magnetospheric and interplanetary magnetic fields. The proposed model allows to determine reconnection efficiency by IMF and solar wind parameters: velocity, density, conductivity. The calculated magnetic field in the magnetosheath is compared with those measured by AMPTEARM satellite for high magnetopause magnetic shear.

V.V. Kalegaev

2000-01-01T23:59:59.000Z

118

Biomimetic synthesis of hierarchical crystalline hydroxyapatite fibers in large-scale  

SciTech Connect (OSTI)

Highlights: ? Crystalline hierarchical hydroxyapatite (HAp) fibers are synthesized. ? We employ a biomimetic route by using cotton cloth as a natural bio-template. ? We study the effects of pH, ultrasonic cleaning time, and calcination temperature. ? We obtain an optimized reaction condition. ? This is a low cost method for production of hierarchical HAp fibers. -- Abstract: Crystalline hierarchical hydroxyapatite [Ca{sub 10}(PO{sub 4}){sub 6}(OH){sub 2}, HAp)] fibers were successfully synthesized via a biomimetic route by using cotton cloth as a natural bio-template. The effects of pH value, aging time, ultrasonic cleaning time, and calcination temperature on the purity and morphology of the resulting hydroxyapatite (HAp) were monitored by scanning election microscope (SEM), X-ray diffraction (XRD), and infrared spectrophotometer (IR) to obtain an optimized reaction condition, namely, pH 9, ultrasonic cleaning for 1 min, aging for 24 h, and calcination at 600 C for 4 h. We found that the natural cellulose could not only control the morphology of HAp but also lower its phase transformation temperature. The impact of this method lies in its low cost and successful production of large-scale patterning of three-dimensional hierarchical HAp fibers.

Xing, Chaogang; Ge, Suxiang; Huang, Baojun; Bo, Yingying [Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan Province 461000 (China)] [Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan Province 461000 (China); Zhang, Di [State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030 (China)] [State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, 1954 Huashan Road, Shanghai 200030 (China); Zheng, Zhi, E-mail: zhengzhi9999@yahoo.com.cn [Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan Province 461000 (China)] [Institute of Surface Micro and Nano Materials, Xuchang University, Xuchang, Henan Province 461000 (China)

2012-06-15T23:59:59.000Z

119

Probing the Gauge Structure of high-temperature superconductors  

E-Print Network [OSTI]

We suggest that a spin-charge separating ansatz, leading to non-Abelian $SU(2) \\otimes U_S(1)$ gauge symmetries in doped antiferromagnets, proposed earlier as a way of describing Kosterlitz-Thouless superconducting gaps at the nodes of the gap of d-wave (high-T_c) superconductors, may also lead to a pseudogap phase, characterised by the formation of (non-superconducting) pairing and the absence of phase coherence. The crucial assumption is again the presence of electrically charged Dirac fermionic excitations (holons) about the points of the (putative) fermi surface in the pertinent phase of the superconductor. We present arguments in support of the r\\^ole of non-perturbative effects (instantons) on the onset of the pseudogap phase. As a means of probing such gauge interactions experimentally, we perform a study of the scaling of the thermal conductivity with an externally-applied magnetic field, in certain effective models involving gauge and/or four-fermion (contact) interactions.

K. Farakos; G. Koutsoumbas; N. E. Mavromatos

1998-05-29T23:59:59.000Z

120

High efficiency proportional neutron detector with solid liner internal structures  

DOE Patents [OSTI]

A tube-style neutron detector, a panel-style neutron detector incorporating a plurality of tube-style neutron detectors, and a panel-style neutron detector including a plurality of anode wires are provided. A plurality of channels is provided in a neutron detector such that each channel has an inner surface of a coating layer including a neutron-absorbing material. A wire anode is provided at end of each channel so that electrons generated by a charged daughter particle generated by a neutron are collected to detect a neutron-matter interaction. Moderator units can be incorporated into a neutron detector to provide improved detection efficiencies and/or to determine neutron energy spectrum. Gas-based proportional response from the neutron detectors can be employed for special nuclear material (SNM) detection. This neutron detector can provide similar performance to .sup.3He-based detectors without requiring .sup.3He and without containing toxic, flammable, or high-pressure materials.

Kisner, Roger Allen; Holcomb, David Eugene; Brown, Gilbert M.

2014-08-05T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

High-Resolution Structure of the Photosynthetic Mn4Ca Catalyst from X-ray Spectroscopy  

E-Print Network [OSTI]

the Photosynthetic Mn 4 Ca Catalyst from X-ray Spectroscopystructure of the Mn 4 Ca catalyst at high-resolution whichthe structure of Mn 4 Ca catalyst as it cycles through the

Yano, Junko

2008-01-01T23:59:59.000Z

122

Methodology and applications of high resolution solid-state NMR to structure determination of proteins  

E-Print Network [OSTI]

A number of methodological developments and applications of solid-state NMR for assignment and high resolution structure determination of microcrystalline proteins and amyloid fibrils are presented. Magic angle spinning ...

Lewandowski, Jzef Romuald

2008-01-01T23:59:59.000Z

123

Nano structure of low crystallinity carbon materials analyzed by using high energy X-ray diffraction  

Science Journals Connector (OSTI)

In this study, we tried to characterize a kind of low crystallinity carbon materials. The structure of polyparaphenylene(PPP)-based carbon was analyzed by means of high energy X-ray diffraction using the apparatu...

Kyoichi Oshida; Tatsuo Nakazawa; Kozo Osawa

2009-06-01T23:59:59.000Z

124

Crystal structure of highly concentrated, ionic microgel suspensions studied by neutron scattering  

Science Journals Connector (OSTI)

We present a neutron-scattering investigation of the crystal structure formed by pH-sensitive poly(2-vinylpyridine) microgel particles with 5?wt?% of cross-linker. We focus on highly swollen particles and explore concentrations ranging from below close packing to well above close packing, where the particles are forced to shrink and/or interpenetrate. The crystal structure is found to be random hexagonal close packed, similar to the structure typically found in hard-sphere systems.

U. Gasser; B. Sierra-Martin; A. Fernandez-Nieves

2009-05-12T23:59:59.000Z

125

Internal spin structure of the proton from high energy polarized e-p scattering  

SciTech Connect (OSTI)

A review is given of experimental knowledge of the spin dependent structure functions of the proton, which is based on inclusive high energy scattering of longitudinal polarized electrons by longitudinally polarized protons in both the deep inelastic and resonance regions, and includes preliminary results from our most recent SLAC experiment. Implications for scaling, sum rules, models of proton structure, and the hyperfine structure interval in hydrogen are given. Possible future directions of research are indicated.

Hughes, V.W.; Baum, G.; Bergstroem, M.R.

1981-02-01T23:59:59.000Z

126

Prospects for accelerated development of high performance structural materials Steven J. Zinkle a,  

E-Print Network [OSTI]

in the operational per- formance and radiation resistance of structural materials during the past few decadesProspects for accelerated development of high performance structural materials Steven J. Zinkle a for fission and fusion energy applica- tions, by linking material fabrication to thermo-mechanical properties

Ghoniem, Nasr M.

127

Beyond Basic Region Caching: Specializing Cache Structures for High Performance and Energy  

E-Print Network [OSTI]

's usage char- acteristics provides many potential benefits: faster access times, lower energy con a small heap footprint, we save energy by using the smaller structure and turn off the larger. For applications with larger footprints, we use both structures, but save energy by keeping highly used "hot" data

McKee, Sally A.

128

Development of High-Gradient Dielectric Laser-Driven Particle Accelerator Structures  

SciTech Connect (OSTI)

The thrust of Stanford's program is to conduct research on high-gradient dielectric accelerator structures driven with high repetition-rate, tabletop infrared lasers. The close collaboration between Stanford and SLAC (Stanford Linear Accelerator Center) is critical to the success of this project, because it provides a unique environment where prototype dielectric accelerator structures can be rapidly fabricated and tested with a relativistic electron beam.

Byer, Robert L.

2013-11-07T23:59:59.000Z

129

Nano-Structured Li3V2(PO4)3 /Carbon Composite for High Rate Lithium...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Nano-Structured Li3V2(PO4)3 Carbon Composite for High Rate Lithium Ion Batteries. Nano-Structured Li3V2(PO4)3 Carbon Composite for High Rate Lithium Ion Batteries. Abstract:...

130

Phase Structure and Properties of Poly(ethylene terephthalate)/High-Density Polyethylene Based on  

E-Print Network [OSTI]

Phase Structure and Properties of Poly(ethylene terephthalate)/High-Density Polyethylene Based.interscience.wiley.com). ABSTRACT: Blends based on recycled high density polyethylene (R-HDPE) and recycled poly(ethylene tereph- thalate) (R-PET) were made through reactive extrusion. The effects of maleated polyethylene (PE

131

Exploring electronic structure through high-resolution hard x-ray  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Exploring electronic structure through high-resolution hard x-ray Exploring electronic structure through high-resolution hard x-ray spectroscopies Tuesday, July 23, 2013 - 11:00am SLAC, Conference Room 137-322 Presented by Dimosthenis Sokaras, Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory Modern high brilliance beamlines coupled with recent advances in hard-x-ray optics are establishing high-resolution hard x-ray spectroscopies as a powerful analytical tool for routine electronic structure investigations. Their advantageous characteristics like the chemical sensitivity or the hard x-rays penetration depth, that permits the implementation of difficult sample environments, expand the applicability of the relevant studies to multidisciplinary scientific fields. Simultaneously, the experimental

132

Evolutionary selection of enzymatically synthesized semiconductors from biomimetic mineralization vesicles  

SciTech Connect (OSTI)

The way nature evolves and sculpts materials using proteins inspires new approaches to materials engineering but is still not completely understood. Here, we present a cell-free synthetic biological platform to advance studies of biologically synthesized solid-state materials. This platform is capable of simultaneously exerting many of the hierarchical levels of control found in natural biomineralization, including genetic, chemical, spatial, structural, and morphological control, while supporting the evolutionary selection of new mineralizing proteins and the corresponding genetically encoded materials that they produce. DNA-directed protein expression and enzymatic mineralization occur on polystyrene microbeads in water-in-oil emulsions, yielding synthetic surrogates of biomineralizing cells that are then screened by flow sorting, with light-scattering signals used to sort the resulting mineralized composites differentially. We demonstrate the utility of this platform by evolutionarily selecting newly identified silicateins, biomineralizing enzymes previously identified from the silica skeleton of a marine sponge, for enzyme variants capable of synthesizing silicon dioxide (silica) or titanium dioxide (titania) composites. Mineral composites of intermediate strength are preferentially selected to remain intact for identification during cell sorting, and then to collapse postsorting to expose the encoding genes for enzymatic DNA amplification. Some of the newly selected silicatein variants catalyze the formation of crystalline silicates, whereas the parent silicateins lack this ability. The demonstrated bioengineered route to previously undescribed materials introduces in vitro enzyme selection as a viable strategy for mimicking genetic evolution of materials as it occurs in nature.

Bawazer, Lukmaan A.; Izumi, Michi; Kolodin, Dmitriy; Neilson, James R.; Schwenzer, Birgit; Morse, Daniel E. (UCSB)

2012-10-29T23:59:59.000Z

133

Fabrication of Biomimetically Patterned Surfaces and Their Application to Probing PlantBacteria Interactions  

Science Journals Connector (OSTI)

Fabrication of Biomimetically Patterned Surfaces and Their Application to Probing PlantBacteria Interactions ... All chemicals and buffers were purchased from Sigma-Aldrich (St. Louis, MO, USA), except for: SU-8 2050 photoresist and developer (MicroChem, Newton, MA, USA); Sylgard 184 elastomer kit (PDMS) (Dow Chemical Company, Midland, MI, USA); and agarose gel-digesting enzyme GELase (Epicenter Biotechnologies, Madison, WI, USA). ... (34, 36, 37) An additional advantage of the present approach is that it allows for a relatively clean separation of the effects of surface microstructure from those of surface chemistry and nanoscale texturing, since one can independently control the chemical composition and properties of the polymeric surface, while maintaining identical microstructures in the replica molding process. ...

Boce Zhang; Yaguang Luo; Arne J. Pearlstein; Jesse Aplin; Yi Liu; Gary R. Bauchan; Gregory F. Payne; Qin Wang; Xiangwu Nou; Patricia D. Millner

2014-07-09T23:59:59.000Z

134

High pressure studies on nanometer sized clusters: Structural, optical, and cooperative properties  

SciTech Connect (OSTI)

High-pressure Se EXAFS is used to study pressure-induced structural transformations in CdSe nanocrystals. The transformation is wurtzite to rock salt, at a pressure much higher than in bulk. High-pressure XRD is used to confirm the EXAFS results. Diffraction peak widths indicate that nanocrystals do not fragment upon transformation. Optical absorption correlates with structural transformations and is used to measure transition pressures; transformation pressure increases smoothly as nanocrystal size decreases. Thermodynamics of transformation is modeled using an elevated surface energy in the high-pressure phase. High-pressure study of Si nanocrystals show large increases in transformation pressure in crystallites to 500{angstrom} diameter, and an overall change in crystallite shape upon transformation is seen from XRD line widths. C{sub 60} single crystals were studied using Raman scattering; results provide information about the clusters` rotational state. Optical properties of high-pressure phase CdSe clusters were studied.

Tolbert, S.H.

1995-05-01T23:59:59.000Z

135

Magnetic and structural phase transitions in erbium at low temperatures and high pressures  

SciTech Connect (OSTI)

Electrical resistance and crystal structure measurements have been carried out on polycrystalline erbium (Er) at temperatures down to 10 K and pressures up to 20 GPa. An abrupt change in the slope of the resistance is observed with decreasing temperature below 84 K, which is associated with the c-axis modulated (CAM) antiferromagnetic (AFM) ordering of the Er moments. With increasing pressure the temperature of the resistance slope change and the corresponding AFM ordering temperature decrease until vanishing above 10.6 GPa. The disappearance of the slope change in the resistance occurs at similar pressures where the hcp structural phase of Er is transformed to a nine-layer {alpha}-Sm structural phase, as confirmed by our high-pressure synchrotron x-ray diffraction studies. These results suggest that the disappearance in the AFM ordering of Er moments is strongly correlated to the structural phase transition at high pressures and low temperatures.

Thomas, Sarah A.; Tsoi, Georgiy M.; Wenger, Lowell E.; Vohra, Yogesh K. (UAB)

2012-02-07T23:59:59.000Z

136

High-pressure structural studies of dysprosium using angle-dispersive x-ray diffraction  

SciTech Connect (OSTI)

We present structural results under pressure for elemental dysprosium (Dy) up to 87 GPa using in situ angle-dispersive x-ray diffraction measurements with synchrotron x rays and a diamond-anvil cell. Dy exhibits the structural transition sequence, hP2{yields}hR9{yields}hP4{yields}distorted cF4, from Rietveld full-profile refinements. Clear evidence is documented for the high-pressure distorted cF4 phase observed above 45 GPa to be an orthorhombic oS8 (Cmmm) structure for Dy in the lanthanide phase diagram.

Shen Yongrong; Kumar, Ravhi S.; Cornelius, Andrew L.; Nicol, Malcolm F. [Department of Physics and High Pressure Science and Engineering Center, University of Nevada Las Vegas, Las Vegas, Nevada 89154-4002 (United States)

2007-02-01T23:59:59.000Z

137

Biomimetic design of materials and biomaterials inspired by the structure of nacre  

Science Journals Connector (OSTI)

...thin-film crystals of CaCO3 to chitosan (which acts as a solid matrix...carbonate were deposited on chitosan matrices with the cooperation...were obtained by alternating chitosan coating and thin-film crystallization...perspectives into the template-inhibitor-biomineral interaction...

2009-01-01T23:59:59.000Z

138

SUPPLEMENTARY MATERIAL Supplementary Material to "High-Dimensional Structure Learning of Ising Models  

E-Print Network [OSTI]

SUPPLEMENTARY MATERIAL Supplementary Material to "High-Dimensional Structure Learning of Ising) (P, Q) := 1 2 P - Q 1 = 1 2 xX |P(x) - Q(x)|. 1.1. Analysis of Ising Models on Trees. We first derive simple expressions for Ising models Markov on trees. This will be later used upon reduction of general

Anandkumar, Animashree

139

Multifunctional Structural Supercapacitor Composites Based on Carbon Aerogel Modified High Performance Carbon Fiber Fabric  

Science Journals Connector (OSTI)

Multifunctional Structural Supercapacitor Composites Based on Carbon Aerogel Modified High Performance Carbon Fiber Fabric ... In particular, radical new approaches to energy storage are required to progress toward future zero emission electrical vehicles. ... vehicle attributes and, in particular, the various levels of hybrids. ...

Hui Qian; Anthony R. Kucernak; Emile S. Greenhalgh; Alexander Bismarck; Milo S. P. Shaffer

2013-05-13T23:59:59.000Z

140

Mesoporous composite cathode materials prepared from inverse micelle structures for high  

E-Print Network [OSTI]

active materials in LIBs. Manganese oxide-based compounds are particularly attrac- tive as cathodes owingMesoporous composite cathode materials prepared from inverse micelle structures for highCoO2) is the most common active material.1 However, since natural deposits of cobalt are scarce

Cao, Guozhong

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

HIGH DIMENSIONAL ELLENTUCK SPACES AND INITIAL CHAINS IN THE TUKEY STRUCTURE OF NON-P-POINTS  

E-Print Network [OSTI]

HIGH DIMENSIONAL ELLENTUCK SPACES AND INITIAL CHAINS IN THE TUKEY STRUCTURE OF NON-P-POINTS NATASHA maximum nor minimum in the Tukey order of ultrafilters ([1]), but it was left open where exactly in the Tukey order it lies. We prove that G2 is in fact Tukey minimal over its projected Ramsey ultrafilter

Dobrinen, Natasha

142

Structural parameters The analytical model proposed here can explain high fracture  

E-Print Network [OSTI]

Structural parameters · The analytical model proposed here can explain high fracture toughness, P.J., et al., Engineering Fracture Mechanics, 2007. 74: p. 19281941. 4. Ritchie, R.O., et al Tensile strength Fracture toughness Composite properties E max S )~( ~ aJ III. Fracture toughness

Barthelat, Francois

143

Time Structure of Particle Production in the MERIT High-Intensity Liquid Mer-  

E-Print Network [OSTI]

experiment is a proofofprinciple test of a target system for a high power proton beam to be used as frontend target size and velocity study jet disruption (cavitation ?) by varying the PS spill structure extracted from PS max. Intensity : 30?1012 protons/pulse 115 kJ of beam power--an PS machine record beam

McDonald, Kirk

144

Key technological issues in LMFBR high-temperature structural design - the US perspective  

SciTech Connect (OSTI)

The purpose of this paper is: (1) to review the key technological issues in LMFBR high-temperature structural design, particularly as they relate to cost reduction; and (2) to provide an overview of activities sponsored by the US Department of Energy to resolve the issues and to establish stable, standardized, and defensible structural design methods and criteria. Specific areas of discussion include: weldments, structural validation tests, simplified design analysis procedures, design procedures for piping, validation of the methodology for notch-like geometries, improved life assessment procedures, thermal striping, extension of the methodology to new materials, and ASME high-temperature Code reform needs. The perceived problems and needs in each area are discussed, and the current status of related US activities is given.

Corum, J.M.

1984-01-01T23:59:59.000Z

145

A novel biomimetic approach to the design of high-performance ceramic/metal composites  

E-Print Network [OSTI]

In particular, ceramic?matrix composites (CMCs) areM. 2006 Ceramic and metal matrix composites: Routes

Launey, Maximilien E.

2010-01-01T23:59:59.000Z

146

Savannah River Site (SRS) high level waste (HLW) structural integrity program  

SciTech Connect (OSTI)

The Savannah River Site has fifty-one underground tanks for radioactive waste storage and processing with doubly-contained piping systems for waste transfer. The SRS High Level Waste structural Integrity Program provides a process for evaluation and documenting material aging issues for structures, systems and components (SSC) in these facilities to maintain their confinement function. SRS has been monitoring waste, waste storage tanks, testing transfer lines and controlling waste chemistry for many years. A successful structural integrity (SI) program requires the following: detailed understanding of applicable degradation mechanisms; controlled chemistries and additions, as necessary; regular chemistry sampling and monitoring; structural capacity considerations; and a combination of on-line and periodic inspection and testing programs to provide early detection of generic degradation and verify effectiveness of the management of degradation under aging conditions identified by the SI Program. The application of these elements in the HLW SI Program achieves confinement in the facilities throughout desired service life.

Marra, J.E.; Abodishish, H.A.; Barnes, D.M.; Sindelar, R.L.; Flanders, H.E.; Houston, T.W.; Wiersma, B.J.; McNatt, F.G. Sr.; Cowfer, C.D. [Westinghouse Savannah River Co., Aiken, SC (United States)

1995-12-01T23:59:59.000Z

147

High-energy mechanical synthesis of nanophase fluorite-structured mixed oxide catalysts with a high redox activity  

SciTech Connect (OSTI)

A series of nanostructured, highly defective, ternary solid solutions containing CeO{sub 2}, ZrO{sub 2}, and MnO{sub 2} or CuO were prepared by high-energy mechanical milling of individual components. Morphological and redox properties were studied by XRD, HRTEM and temperature-programmed reduction techniques. It was shown that the introduction of small amounts of copper and manganese strongly promotes the redox behavior of cerium at lower temperatures in comparison with CeO{sub 2} and CeO{sub 2}-ZrO{sub 2}. High temperature treatment of up to 1,400 K was also shown to further promote overall redox capacity without affecting low-temperature redox behavior. Moreover, evidence is provided to show that Cu and Mn are dissolved within the CeO{sub 2} lattice structure. Addition of dopants enhances catalytic redox properties in the oxidation of CO at low temperatures, which is associated with the high concentration of oxygen vacancies that form on the introduction of aliovalent elements into the ceria-zirconia lattice.

Primavera, A.; Trovarelli, A.; Terribile, D.; Leitenburg, C. de; Dolcetti, G. [Univ. di Udine (Italy). Dipt. di Scienze e Tecnologie Chimiche; Llorca, J. [Univ. de Barcelona (Spain). Dept. de Quimica Inorganica

1997-12-31T23:59:59.000Z

148

Thermodynamics and Structural Properties of the High Density Gaussian Core Model  

E-Print Network [OSTI]

We numerically study thermodynamic and structural properties of the one-component Gaussian core model (GCM) at very high densities. The solid-fluid phase boundary is carefully determined. We find that the density dependence of both the freezing and melting temperatures obey the asymptotic relation, $\\log T_f$, $\\log T_m \\propto -\\rho^{2/3}$, where $\\rho$ is the number density, which is consistent with Stillinger's conjecture. Thermodynamic quantities such as the energy and pressure and the structural functions such as the static structure factor are also investigated in the fluid phase for a wide range of temperature above the phase boundary. We compare the numerical results with the prediction of the liquid theory with the random phase approximation (RPA). At high temperatures, the results are in almost perfect agreement with RPA for a wide range of density, as it has been already shown in the previous studies. In the low temperature regime close to the phase boundary line, although RPA fails to describe the structure factors and the radial distribution functions at the length scales of the interparticle distance, it successfully predicts their behaviors at shorter length scales. RPA also predicts thermodynamic quantities such as the energy, pressure, and the temperature at which the thermal expansion coefficient becomes negative, almost perfectly. Striking ability of RPA to predict thermodynamic quantities even at high densities and low temperatures is understood in terms of the decoupling of the length scales which dictate thermodynamic quantities from the interparticle distance which dominates the peak structures of the static structure factor due to the softness of the Gaussian core potential.

Atsushi Ikeda; Kunimasa Miyazaki

2011-04-18T23:59:59.000Z

149

Structural phase transition in induced by swift heavy ion irradiation at high-pressure  

Science Journals Connector (OSTI)

Exposing pressurized crystals to GeV heavy ions reveals unexpected structural changes. Irradiated at ambient conditions, natural zirconia ( ZrO 2 ) transforms from the monoclinic structure to its tetragonal (high-temperature) phase. For this process the required fluence must exceed 5 10 12 ions / cm 2 for Pb and U and becomes even significantly higher for lighter ions. If samples are pressurized during irradiation using diamond anvil cells, the required fluence drops at least by one order of magnitude. The efficiency of the monoclinic to tetragonal phase transition becomes larger with increasing pressure.

B. Schuster; M. Lang; R. Klein; C. Trautmann; R. Neumann; A. Benyagoub

2009-01-01T23:59:59.000Z

150

High-resolution crystal structures of two crystal forms of human cyclophilin D in complex with PEG 400 molecules  

Science Journals Connector (OSTI)

High-resolution crystal structures of cyclophilin D in complex with PEG 400 in primitive orthorhombic and primitive tetragonal forms are reported.

Valasani, K.R.

2014-05-24T23:59:59.000Z

151

Discrete Alterations of Brain Network Structural Covariance in Individuals at Ultra-High Risk for Psychosis  

Science Journals Connector (OSTI)

AbstractBackground Investigation of aberrant large-scale brain networks offers novel insight into the role these networks play in diverse psychiatric disorders, such as schizophrenia. While there are studies reporting altered functional brain connectivity in participants at ultra-high risk (UHR) for psychosis, it is unclear whether these alterations extend to structural brain networks. Methods Whole-brain structural covariance patterns of 133 participants at UHR for psychosis (51 of whom subsequently developed psychosis) and 65 healthy controls (HC) were studied. Following data pre-processing (using VBM8), the mean signal in seed regions relating to specific networks (visual, auditory, motor, speech, semantic, executive, salience and default-mode) were extracted and voxel-wise analyses of covariance were conducted to compare the association between whole brain signal and each seed region for UHR and HC individuals. UHR participants who transitioned were compared to those who did not. Results Significantly reduced structural covariance was observed in the UHR sample compared to HC for the default-mode network, and increased covariance for the motor and executive control networks. When those who transitioned to psychosis were compared with those who did not, aberrant structural covariance was observed in the salience, executive-control, auditory and motor networks. Conclusions Whole-brain structural covariance analyses revealed subtle changes of connectivity of the default-mode, executive control, salience, motor and auditory networks in UHR individuals for psychosis. Although we found significant differences, these are small changes, and tend to reflect largely intact structural networks.

Kareen Heinze; Renate L.E.P. Reniers; Barnaby Nelson; Alison R. Yung; Ashleigh Lin; Ben J. Harrison; Christos Pantelis; Dennis Velakoulis; Patrick D. McGorry; Stephen J. Wood

2014-01-01T23:59:59.000Z

152

Multiple high-temperature transitions driven by dynamical structures in NaI  

SciTech Connect (OSTI)

Multiple, consecutive high-temperature transitions in NaI involving dynamical order and/or localization in the energy-momentum spectrum but not in the average crystal structure are revealed by lattice dynamics, x-ray lattice spacing, and heat capacity measurements. Distinctive energy-momentum patterns and lattice distortions indicate dynamical structures forming within randomly stacked planes, rather than the isolated point-defect-like intrinsic localized modes predicted. Transition entropies are accounted for by vibrational entropy changes and the transition enthalpies are explained by the strain energy of forming stacking-fault-like planar distortions deduced from x-ray diffraction peak shifts. The vibrational entropy of the dynamical structures stabilizes surrounding elastic distortions.

Manley, Michael E [ORNL; Jeffries, Jason R [ORNL; Lee, Hohyun [Santa Clara University, California; Zabalegui, Aitor [Santa Clara University, California; Abernathy, Douglas L [ORNL

2014-01-01T23:59:59.000Z

153

High resolution structure of the large ribosomal subunit from a Mesophilic Eubacterium  

SciTech Connect (OSTI)

We describe the high resolution structure of the large ribosomal subunit from Deinococcus radiodurans (D50S), a gram-positive mesophile suitable for binding of antibiotics and functionally relevant ligands. The over-all structure of D50S is similar to that from the archae bacterium Haloarcula marismortui (H50S); however, a detailed comparison revealed significant differences, for example, in the orientation of nucleotides in peptidyl transferase center and in the structures of many ribosomal proteins. Analysis of ribosomal features involved in dynamic aspects of protein biosynthesis that are partially or fully disordered in H50S revealed the conformations of intersubunit bridges in unbound subunits, suggesting how they may change upon subunit association and how movements of the L1-stalk may facilitate the exit of tRNA.

Harms, Joerg; Schluenzen, Frank; Zarivach, Raz; Bashan, Anat; Gat, Sharon; Agmon, Ilana; Bartels, Heike; Franceschi, Francois; Yonath, Ada (Weizmann Inst Israel); (Mac Planck Germany); (Max Planck Germany)

2009-10-07T23:59:59.000Z

154

The structural impact of commodity farm programs on farms in the Southern Texas High Plains  

E-Print Network [OSTI]

OPTIMIZATION OF A HYBRID SOLAR ENERGY COLLECTOR SYSTEM A Thesis by ALAN M. SHI NEMAN Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree MASTER OF SCIENCE May 1981 Major Subject...: Mechanical Engineering 1981 Thesis 5558 THE STRUCTURAL IMPACT OP COMMODITY FARM PROGRAMS ON FARMS IN THE SOUTHERN TEXAS HIGH PLAINS A Thesis by CHRISTINA KAY SHIRLEY Submitted to the Graduate College of Texas AAM University in partial fulfillment...

Shirley, Christina Kay

1981-01-01T23:59:59.000Z

155

Theory of factors limiting high gradient operation of warm accelerating structures  

SciTech Connect (OSTI)

This final report summarizes the research performed during the time period from 8/1/2010 to 7/31/2013. It consists of two parts describing our studies in two directions: (a) analysis of factors limiting operation of dielectric-loaded accelerating (DLA) structures where the main problem is the occurrence of multipactor on dielectric surfaces, and (b) studies of effects associated with either RF magnetic or RF electric fields which may cause the RF breakdown in high-gradient metallic accelerating structures. In the studies of DLA structures, at least, two accomplishments should be mentioned: the development of a 3D non-stationary, self-consistent code describing the multipactor phenomena and yielding very good agreement with some experimental data obtained in joint ANL/NRL experiments. In the metallic structures, such phenomena as the heating and melting of micro-particles (metallic dust) by RF electric and magnetic fields in single-shot and rep-rate regimes is analyzed. Also, such processes in micro-protrusions on the structure surfaces as heating and melting due to the field emitted current and the Nottingham effect are thoroughly investigated with the account for space charge of emitted current on the field emission from the tip.

Nusinovich, Gregory S. [University of Maryland; Antonsen, Thomas M. [University of Maryland; Kishek, Rami [University of Maryland

2014-07-25T23:59:59.000Z

156

Nano-sized structured layered positive electrode materials to enable high energy density and high rate capability lithium batteries  

DOE Patents [OSTI]

Nano-sized structured dense and spherical layered positive active materials provide high energy density and high rate capability electrodes in lithium-ion batteries. Such materials are spherical second particles made from agglomerated primary particles that are Li.sub.1+.alpha.(Ni.sub.xCo.sub.yMn.sub.z).sub.1-tM.sub.tO.sub.2-dR.sub.d- , where M is selected from can be Al, Mg, Fe, Cu, Zn, Cr, Ag, Ca, Na, K, In, Ga, Ge, V, Mo, Nb, Si, Ti, Zr, or a mixture of any two or more thereof, R is selected from F, Cl, Br, I, H, S, N, or a mixture of any two or more thereof, and 0.ltoreq..alpha..ltoreq.0.50; 0

Deng, Haixia; Belharouak, Ilias; Amine, Khalil

2012-10-02T23:59:59.000Z

157

EFFECT OF THE MODEL CORRELATING STRUCTURAL DAMAGE TO REPAIRING COST ON LIFE CYCLE ECONOMIC LOSS ESTIMATION OF BUILDING STRUCTURES IN HIGH SEISMIC ZONE  

E-Print Network [OSTI]

correlating the damage to repairing cost on the life cycle loss using a simple model. Buildings are modeledEFFECT OF THE MODEL CORRELATING STRUCTURAL DAMAGE TO REPAIRING COST ON LIFE CYCLE ECONOMIC LOSS ESTIMATION OF BUILDING STRUCTURES IN HIGH SEISMIC ZONE Noriyuki TAKAHASHI, Hitoshi SHIOHARA, and Shunsuke

Shiohara, Hitoshi

158

Water channel structure of bassanite at high air humidity: crystal structure of CaSO40.625H2O  

Science Journals Connector (OSTI)

In the presence of high relative air humidity the crystal structure of CaSO40.5H2O transforms due to the incorporation of additional water of hydration. The crystal structure of CaSO40.625H2O was solved by single-crystal X-ray diffraction at 298 K with 75% relative air humidity.

Schmidt, H.

2011-11-17T23:59:59.000Z

159

High Pressure Phase Transformations in Heavy Rare Earth Metals and Connections to Actinide Crystal Structures  

SciTech Connect (OSTI)

High-pressure studies have been performed on heavy rare earth metals Terbium (Tb) to 155 GPa and Holmium (Ho) to 134 GPa in a diamond anvil cell at room temperature. The following crystal structure sequence was observed in both metals hcp {yields} Sm-type {yields} dhcp {yields} distorted fcc (hR-24) {yields} monoclinic (C2/m) with increasing pressure. The last transformation to a low symmetry monoclinic phase is accompanied by a volume collapse of 5 % for Tb at 51 GPa and a volume collapse of 3 % for Ho at 103 GPa. This volume collapse under high pressure is reminiscent of f-shell delocalization in light rare earth metal Cerium (Ce), Praseodymium (Pr), and heavy actinide metals Americium (Am) and Curium (Cm). The orthorhombic Pnma phase that has been reported in Am and Cm after f-shell delocalization is not observed in heavy rare earth metals under high pressures. (authors)

Vohra, Yogesh K.; Sangala, Bagvanth Reddy; Stemshorn, Andrew K. [Physics, University of Alabama at Birmingham (UAB), 310 Campbell Hall, 1300 University Boulevard, Birmingham, AL, 35294-1170 (United States); Hope, Kevin M. [Biology, Chemistry, and Mathematics, University of Montevallo, Harman Hall, Station 6480, Montevallo, AL, 35115 (United States)

2008-07-01T23:59:59.000Z

160

Solar wind suprathermal electron Stahl widths across high-speed stream structures  

SciTech Connect (OSTI)

Suprathermal electrons (100-1500 eV) observed in the solar wind typically show a strahl distribution, that is, a beam directed away from the Sun along the magnetic field direction. The strahl width observed at 1 AU is highly variable, ranging from 10-70 degrees. The obsenred finite width of the strahl results from the competition between beam focusing as the interplanetary magnetic field strength drops with distance from the Sun, and pitch-angle scattering as the beam interacts with the solar wind plasma in transit from the sun. Here we examine strahl width, observed with ACE SWEPAM across high-speed stream structures to investigate variations in electron scattering as a function of local plasma characteristics. We find that narrow strahls (less than 20 degrees wide), indicating reduced scattering, are observed within high-speed streams. Narrow strahls are also observed in both very low temperature solar wind, in association with ICMEs. Case studies of high-speed streams typically show the strahl narrowing at the leading edge of the stream. In some cases, the strahl narrows at the reverse shock or pressure wave, in other cases at the stream interface. The narrowing can either occur discontinuously or gradually over a period of hours. Within the high-speed wind, the strahl remains narrow for a period of hours to days, and then gradually broadens. The strahl width is roughly constant at all energies across these structures. For some fraction of high-speed streams, counterstreaming is associated with passage of the corotating interaction region. In these cases, we find the widths of the two counterstreaming beams frequently differ by more than 40 degrees. This dramatic difference in strahl width contrasts with observations in the solar wind as a whole, in which counterstreaming strahls typically differ in width by less than 20 degrees.

Skoug, Ruth M [Los Alamos National Laboratory; Steinberg, John T [Los Alamos National Laboratory; Goodrich, Katherine A [Los Alamos National Laboratory; Anderson, Brett R [DARTMUTH UNIV.

2011-01-03T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

High-Resolution Structure of the Photosynthetic Mn4Ca Catalyst from X-ray Spectroscopy  

SciTech Connect (OSTI)

The application of high-resolution X-ray spectroscopy methods to study the photosynthetic water oxidizing complex, which contains a unique hetero-nuclear catalytic Mn4Ca cluster, are described. Issues of X-ray damage especially at the metal sites in the Mn4Ca cluster are discussed. The structure of the Mn4Ca catalyst at high-resolution which has so far eluded attempts of determination by X-ray diffraction, EXAFS and other spectroscopic techniques has been addressed using polarized EXAFS techniques applied to oriented PS II membrane preparations and PS II single crystals. A review of how the resolution of traditional EXAFS techniques can be improved, using methods such as range-extended EXAFS is presented, and the changes that occur in the structure of the cluster as it advances through the catalytic cycle are described. X-ray absorption and emission techniques (XANES and K? emission) have been used earlier to determine the oxidation states of the Mn4Ca cluster, and in this report we review the use of X-ray resonant Raman spectroscopy to understand the electronic structure of the Mn4Ca cluster as it cycles through the intermediate S-states.

Yachandra, Vittal; Yano, Junko; Kern, Jan; Pushkar, Yulia; Sauer, Kenneth; Glatzel, Pieter; Bergmann, Uwe; Messinger, Johannes; Zouni, Athina; Yachandra, Vittal K.

2007-08-01T23:59:59.000Z

162

Experimental study of a structural magnesium alloy with high absorption energy under dynamic loading  

SciTech Connect (OSTI)

It has been demonstrated that pure Mg exhibits low ductility under dynamic loading at room temperature owing to its HCP structure. Very limited data are currently available for magnesium alloys under dynamic loading. In order to be used for structural components, it is necessary to improve the mechanical properties of magnesium alloys. Lahaise et al. reported the yield strength of the AZ91 magnesium alloy increased with refining its microstructure. Mohri et al. has already been reported the ductility enhancement of a Mg-Y-RE(Rare Earth) alloy by hot extrusion. They mentioned the enhancement of ductility is due to the refining microstructure of magnesium. Thus refining microstructure enables to raise the possibility for the development of a structural magnesium alloy with high ductility at dynamic strain rate. In this paper, the possibility of a fine-grained WE43 magnesium alloy is investigated to raise the high speed impact performance against the foreign object damage by the enhancement of ductility and absorption energy under dynamic loading.

Mukai, T.; Ishikawa, K. [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.] [Osaka Municipal Technical Research Inst. (Japan). Mechanical Engineering Dept.; Mohri, T. [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan)] [Nagoya Municipal Industrial Research Inst. Rokuban, Atsuta (Japan); Nakamura, M. [National Industrial Research Inst., Nagoya (Japan)] [National Industrial Research Inst., Nagoya (Japan); Higashi, K. [Osaka Prefecture Univ., Sakai (Japan)] [Osaka Prefecture Univ., Sakai (Japan)

1998-10-05T23:59:59.000Z

163

Crystal Structure and Chemical Bonding of the High-Temperature Phase of AgN3  

SciTech Connect (OSTI)

The crystal structure of silver azide (AgN{sub 3}) in its high-temperature (HT) modification was determined from X-ray powder diffraction data, recorded at T = 170 {sup o}C and was further refined by the Rietveld method. The structure is monoclinic (P2{sub 1}lc (No. 14), a = 6.0756(2) {angstrom}, b = 6.1663(2) {angstrom}, c = 6.5729(2) {angstrom}, {beta} = 114.19(0){sup o}, V = 224.62(14) {angstrom}{sup 3}, Z = 4) and consists of two-dimensional Ag and N containing layers in which the silver atoms are coordinated by four nitrogen atoms exhibiting a distorted square coordination environment. These sheets are linked together by weaker perpendicular Ag-N contacts, thus forming a 4 + 2 coordination geometry around the silver atoms. The phase transition has been characterized by DTA, DSC, and measurement of the density, as well as of the ionic conductivity. Both, the room-temperature and the HT phase are electrically insulating. This fact is getting support by DFT band structure calculations within the generalized gradient approximation, using the PBE functional. On the basis of the DFT band structure, the bonding characteristics of both phases are essentially the same. Finally, the implication of the existence of a low-symmetry HT-phase in a crystalline explosive concerning decomposition mechanisms is discussed.

Schmidt,C.; Dinnebier, R.; Wedig, U.; Jansen, M.

2007-01-01T23:59:59.000Z

164

High-spin level structure of the doubly odd nucleus 104Ag  

Science Journals Connector (OSTI)

The high-spin level structure of the doubly odd nucleus 104Ag has been investigated via the 97Mo(11B, 4n)104Ag reaction at a beam energy of 50 MeV. The newly established level scheme includes lower-lying two-quasiparticle states and several higher-lying bands. Two positive-parity bands associated with the ?g9/2?1??d5/2 and ?g9/2?1??g7/2 configurations are extended significantly. Based on the comparison with the analogous structures in neighboring nuclei and the features of nuclear chirality, the negative parity bands are suggested as candidate chiral doublet bands with the ?g9/2?1??h11/2 configuration.

Z. G. Wang; M. L. Liu; Y. H. Zhang; X. H. Zhou; B. T. Hu; N. T. Zhang; S. Guo; B. Ding; Y. D. Fang; J. G. Wang; G. S. Li; Y. H. Qiang; S. C. Li; B. S. Gao; Y. Zheng; W. Hua; X. G. Wu; C. Y. He; Y. Zheng; C. B. Li; J. J. Liu; S. P. Hu

2013-08-07T23:59:59.000Z

165

Charge-distribution effect of imaging molecular structure by high-order above-threshold ionization  

SciTech Connect (OSTI)

Using a triatomic molecular model, we show that the interference pattern in the high-order above-threshold ionization (HATI) spectrum depends dramatically on the charge distribution of the molecular ion. Therefore the charge distribution can be considered a crucial factor for imaging a molecular geometric structure. Based on this study, a general destructive interference formula for each above-threshold ionization channel is obtained for a polyatomic molecule concerning the positions and charge values of each nuclei. Comparisons are made for the HATI spectra of CO{sub 2}, O{sub 2}, NO{sub 2}, and N{sub 2}. These results may shed light on imaging complex molecular structure by the HATI spectrum.

Wang Bingbing; Fu Panming [Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080 (China); Guo Yingchun [Department of Physics, State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062 (China); Zhang Bin; Zhao Zengxiu [Department of Physics, National University of Defense Technology, Changsha 410073 (China); Yan Zongchao [Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3 (Canada)

2010-10-15T23:59:59.000Z

166

High-Pressure Core Structures of Si Nanoparticles for Solar Energy Conversion  

Science Journals Connector (OSTI)

We present density functional and many body perturbation theory calculations of the electronic, optical, and impact ionization properties of Si nanoparticles (NPs) with core structures based on high-pressure bulk Si phases. Si particles with a BC8 core structure exhibit significantly lower optical gaps and multiple exciton generation (MEG) thresholds, and an order of magnitude higher MEG rate than diamondlike ones of the same size. Several mechanisms are discussed to further reduce the gap, including surface reconstruction and chemistry, excitonic effects, and embedding pressure. Experiments reported the formation of BC8 NPs embedded in amorphous Si and in amorphous regions of femtosecond-laser doped black silicon. For all these reasons, BC8 nanoparticles may be promising candidates for MEG-based solar energy conversion.

S. Wippermann; M. Vrs; D. Rocca; A. Gali; G. Zimanyi; G. Galli

2013-01-24T23:59:59.000Z

167

High performance vertical tunneling diodes using graphene/hexagonal boron nitride/graphene hetero-structure  

SciTech Connect (OSTI)

A tunneling rectifier prepared from vertically stacked two-dimensional (2D) materials composed of chemically doped graphene electrodes and hexagonal boron nitride (h-BN) tunneling barrier was demonstrated. The asymmetric chemical doping to graphene with linear dispersion property induces rectifying behavior effectively, by facilitating Fowler-Nordheim tunneling at high forward biases. It results in excellent diode performances of a hetero-structured graphene/h-BN/graphene tunneling diode, with an asymmetric factor exceeding 1000, a nonlinearity of ?40, and a peak sensitivity of ?12?V{sup ?1}, which are superior to contending metal-insulator-metal diodes, showing great potential for future flexible and transparent electronic devices.

Hwan Lee, Seung; Lee, Jia; Ho Ra, Chang; Liu, Xiaochi; Hwang, Euyheon [Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Sup Choi, Min [Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Center for Human Interface Nano Technology (HINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Hee Choi, Jun [Frontier Research Laboratory, Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., Yongin, Gyeonggi-do 446-711 (Korea, Republic of); Zhong, Jianqiang; Chen, Wei [Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542 (Singapore); Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543 (Singapore); Jong Yoo, Won, E-mail: yoowj@skku.edu [Samsung-SKKU Graphene Center (SSGC), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Department of Nano Science and Technology, SKKU Advanced Institute of Nano-Technology (SAINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of); Center for Human Interface Nano Technology (HINT), Sungkyunkwan University, 2066, Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do 440-746 (Korea, Republic of)

2014-02-03T23:59:59.000Z

168

Improved Structure and Fabrication of Large, High-Power KHPS Rotors - Final Scientific/Technical Report  

SciTech Connect (OSTI)

Verdant Power, Inc, working in partnership with the National Renewable Energy Laboratory (NREL), Sandia National Laboratories (SNL), and the University of Minnesota St. Anthony Falls Laboratory (SAFL), among other partners, used evolving Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA) models and techniques to improve the structure and fabrication of large, high-power composite Kinetic Hydropower System (KHPS) rotor blades. The objectives of the project were to: design; analyze; develop for manufacture and fabricate; and thoroughly test, in the lab and at full scale in the water, the improved KHPS rotor blade.

Corren, Dean [Verdant Power, Inc.; Colby, Jonathan [Verdant Power, Inc.; Adonizio, Mary Ann [Verdant Power, Inc.

2013-01-29T23:59:59.000Z

169

A Biomimetic Approach to Robot Table Tennis Katharina Mlling1,2, Jens Kober1,2, Jan Peters1,2  

E-Print Network [OSTI]

and on a real anthropomorphic seven degrees of freedom Barrett WAMTM robot arm. keywords biomimetic robotics approaches, we use an anthropomorphic robot arm with seven degrees of freedom (DoFs) and concentrate is to generate human-like striking movements on an anthropomorphic robot arm with seven DoFs. We investigate

170

Coherent structures, intermittent turbulence, and dissipation in high-temperature plasmas  

SciTech Connect (OSTI)

An unsolved problem in plasma turbulence is how energy is dissipated at small scales. Particle collisions are too infrequent in hot plasmas to provide the necessary dissipation. Simulations either treat the fluid scales and impose an ad hoc form of dissipation (e.g., resistivity) or consider dissipation arising from resonant damping of small amplitude disturbances where damping rates are found to be comparable to that predicted from linear theory. Here, we report kinetic simulations that span the macroscopic fluid scales down to the motion of electrons. We find that turbulent cascade leads to generation of coherent structures in the form of current sheets that steepen to electron scales, triggering strong localized heating of the plasma. The dominant heating mechanism is due to parallel electric fields associated with the current sheets, leading to anisotropic electron and ion distributions which can be measured with NASA's upcoming Magnetospheric Multiscale mission. The motion of coherent structures also generates waves that are emitted into the ambient plasma in form of highly oblique compressional and shear Alfven modes. In 3D, modes propagating at other angles can also be generated. This indicates that intermittent plasma turbulence will in general consist of both coherent structures and waves. However, the current sheet heating is found to be locally several orders of magnitude more efficient than wave damping and is sufficient to explain the observed heating rates in the solar wind.

Karimabadi, H.; Roytershteyn, V. [Department of Electrical and Computer Engineering, University of California, San Diego, La Jolla, California 92093 (United States); Wan, M.; Matthaeus, W. H.; Wu, P.; Shay, M. [University of Delaware, Department of Physics and Astronomy, Newark, Delaware 19716 (United States); Daughton, W.; Nakamura, T. K. M. [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States); Loring, B. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Borovsky, J. [Space Science Institute, Boulder, Colorado 80301 (United States); Leonardis, E.; Chapman, S. C. [Centre for Fusion, Space and Astrophysics, University of Warwick, Coventry, CV4 7AL (United Kingdom)

2013-01-15T23:59:59.000Z

171

High resolution electron diffraction analysis of structural changes associated with the photocycle of bacteriorhodopsin  

SciTech Connect (OSTI)

Changes in protein structure that occur during the formation of the M photointermediate of bacteriorhodopsin can be directly visualized by electron diffraction techniques. Samples containing a high percentage of the M intermediate were trapped by rapidly cooling the crystals with liquid nitrogen following illumination with filtered green light at 240K and 260K respectively. Difference Fourier projection maps for M minus bR at two temperatures and for M{sub 260K} minus M{sub 240K} are presented. While it is likely that a unique M-substate is trapped when illuminated at 260K produces a mixture of the M{sub 240K} substate and a second M-substate which may have a protein structure similar to the N-intermediate. The diffraction data clearly show that statistically significant structural changes occur upon formation of the M{sub 240K} specimen and then further upon formation of the second substate which is present in the mixture that is produced at 260K. A preliminary 3-D difference map, based on data collected with samples tilted up to 30{degree}, has been constructed at a resolution of 3.5{angstrom} parallel to the membrane plane and a resolution of 8.5{angstrom} perpendicular to the membrane. The data have been analyzed by a number of different criteria to ensure that the differences seen reflect real conformation changes at a level which is significantly above the noise in the map. Furthermore, a comparison of the positions of specific backbone and side-chain groups relative to significant difference peaks suggests that it will be necessary to further refine the atomic resolution model before it will be possible to interpret the changes in chemical structure that occur in the protein at this stage of the photocycle.

Han, B.-G. [Lawrence Berkeley Lab., CA (United States). Life Sciences Div.]|[Univ. of California, Berkeley, CA (United States). Dept. of Biophysics

1994-04-01T23:59:59.000Z

172

Crystal structure prediction and hydrogen-bond symmetrization of solid hydrazine under high pressure: a first-principles study  

Science Journals Connector (OSTI)

Three crystal structures of hydrazine under high pressure have been found, including the reported experimental phase. Pressure-induced hydrogen-bond symmetrization occurs at 235 GPa during the CcC2/c transition.

Zhang, H.-D.

2014-01-31T23:59:59.000Z

173

Radiation Resistance of Structural Materials of Nuclear Reactors on Irradiation with High-Energy Hydrogen and Helium Ions  

Science Journals Connector (OSTI)

Basic principles of determination of the radiation resistance of structural materials of nuclear reactors with implantation of high-energy hydrogen and helium atoms have been presented. ... them with hydrogen and...

F. F. Komarov; A. F. Komarov; Vl. V. Pil?ko

2013-11-01T23:59:59.000Z

174

Highly resolved early Eocene food webs show development of modern trophic structure after the end-Cretaceous extinction  

Science Journals Connector (OSTI)

...credited. Highly resolved early Eocene food webs show development of modern trophic structure...CA 94111, USA. Generalities of food web structure have been identified for extant...unresolved, as prior studies of fossil webs have been limited by low-resolution...

2014-01-01T23:59:59.000Z

175

Large-Scale Electronic Structure Calculations of High-Z Metals on the BlueGene/L Platform  

E-Print Network [OSTI]

Large-Scale Electronic Structure Calculations of High-Z Metals on the BlueGene/L Platform Francois-accuracy electronic structure calculations needed to evaluate the energy of isolated defects. Such calculations cell. This in turn implies that a large number of valence electrons must be included in the calculation

Franchetti, Franz

176

Using high-order methods on adaptively refined block-structured meshes - discretizations, interpolations, and filters.  

SciTech Connect (OSTI)

Block-structured adaptively refined meshes (SAMR) strive for efficient resolution of partial differential equations (PDEs) solved on large computational domains by clustering mesh points only where required by large gradients. Previous work has indicated that fourth-order convergence can be achieved on such meshes by using a suitable combination of high-order discretizations, interpolations, and filters and can deliver significant computational savings over conventional second-order methods at engineering error tolerances. In this paper, we explore the interactions between the errors introduced by discretizations, interpolations and filters. We develop general expressions for high-order discretizations, interpolations, and filters, in multiple dimensions, using a Fourier approach, facilitating the high-order SAMR implementation. We derive a formulation for the necessary interpolation order for given discretization and derivative orders. We also illustrate this order relationship empirically using one and two-dimensional model problems on refined meshes. We study the observed increase in accuracy with increasing interpolation order. We also examine the empirically observed order of convergence, as the effective resolution of the mesh is increased by successively adding levels of refinement, with different orders of discretization, interpolation, or filtering.

Ray, Jaideep; Lefantzi, Sophia; Najm, Habib N.; Kennedy, Christopher A.

2006-01-01T23:59:59.000Z

177

Crystal structure and phonon instability of high-temperature ?-Ca(BH4)2  

Science Journals Connector (OSTI)

Ca(BH4)2 is an interesting candidate for high-density hydrogen storage since it contains a large amount of hydrogen by weight and volume, and has been shown to reversibly release and absorb hydrogen, albeit at moderately high temperatures. Ca(BH4)2 undergoes a polymorphic transformation around 400440 K from a low-temperature ?-Ca(BH4)2 phase to a high-temperature ?-Ca(BH4)2 phase. The crystal structure of ?-Ca(BH4)2 has only recently been resolved, and its thermodynamic phase stability is still not well understood. Using a combined experimental and theoretical approach, we have independently determined the structure of ?-Ca(BH4)2 and assessed its thermodynamic stability in the quasiharmonic approximation. The space-group P42/m gives an excellent agreement between experiment and theory, confirming the result of a recent study [Buchter et al., J. Phys. Chem. B 112, 8042 (2008)]. Using density-functional theory (DFT), we obtained a value of 10.9 kJ/mol for the static total-energy difference between the ?-Ca(BH4)2 and the ?-Ca(BH4)2 phases at T=0?K (without vibrations). Using DFT linear-response calculations, we find that the [1212?] acoustic phonon branch of ?-Ca(BH4)2 is dynamically unstable on the Brillouin-zone boundary at the T=0?K lattice parameters predicted from static DFT calculations. This phonon branch is very sensitive to the lattice parameters and can be stabilized by including lattice expansion due to zero-point vibrational contributions in the quasiharmonic approximation. This expanded stable ?-Ca(BH4)2 structure has a room-temperature vibrational entropy that is 16?J/mol?K higher than that of the ?-Ca(BH4)2 phase, qualitatively consistent with the observed stabilization of the former at elevated temperatures. The main contribution to the entropy difference between the ?-Ca(BH4)2 and ?-Ca(BH4)2 phases comes from the low-frequency region dominated by translational and rotational phonon modes.

Young-Su Lee; Yoonyoung Kim; Young Whan Cho; Daniel Shapiro; Chris Wolverton; Vidvuds Ozoli?

2009-03-13T23:59:59.000Z

178

A Laves phase-body-centered cubic structural relationship determined using high voltage electron microscopy  

SciTech Connect (OSTI)

High energy electron and ion irradiation of a TiCr{sub 2} Laves compound were found previously to result in a transformation to a body-centered cubic (bcc) solid solution. In the case of electron irradiation, the precipitating bcc phase exhibits preferential crystallographic orientation with respect to the initial compound crystal for irradiation temperatures above 200 K. This article presents an analysis of the electron diffraction data gathered in the course of the electron irradiation-induced Laves phase to bcc transformation in TiCr{sub 2}. A structural relationship between the bcc and Laves compound crystal lattices is determined which can account for all observations of preferentially oriented bcc precipitates. The significance of this mechanism for transformations between bcc and the Laves phases is discussed. In addition, the possible significance for deformation mechanisms of the Laves compounds is explored.

Sinkler, W. [GKSS Forschungszentrum, Geesthacht (Germany). Inst. fuer Werkstofforschung] [GKSS Forschungszentrum, Geesthacht (Germany). Inst. fuer Werkstofforschung

1996-04-01T23:59:59.000Z

179

Highly charged ions for atomic clocks and search for variation of the fine structure constant  

E-Print Network [OSTI]

We review a number of highly charged ions which have optical transitions suitable for building extremely accurate atomic clocks. This includes ions from Hf$^{12+}$ to U$^{34+}$, which have the $4f^{12}$ configuration of valence electrons, the Ir$^{17+}$ ion, which has a hole in almost filled $4f$ subshell, the Ho$^{14+}$, Cf$^{15+}$, Es$^{17+}$ and Es$^{16+}$ ions. Clock transitions in most of these ions are sensitive to variation of the fine structure constant, $\\alpha$ ($\\alpha = e^2/\\hbar c$). E.g., californium and einsteinium ions have largest known sensitivity to $\\alpha$-variation while holmium ion looks as the most suitable ion for experimental study. We study the spectra of the ions and their features relevant to the use as frequency standards.

Dzuba, V A

2015-01-01T23:59:59.000Z

180

Phase structure of an Abelian two-Higgs model and high temperature superconductors  

E-Print Network [OSTI]

We study the phase structure of a three dimensional Abelian Higgs model with singly- and doubly-charged scalar fields coupled to a compact Abelian gauge field. The model is pretending to describe systems of strongly correlated electrons such as high-Tc superconductivity in overdoped regime and exotic phases supporting excitations with fractionalized quantum numbers. We identify the Fermi liquid, the spin gap, the superconductor and the strange metallic phases in which densities and properties of holon and spinon vortices and monopoles are explored. The phase diagram in the 3D coupling space is predicted. We show that at sufficiently strong gauge coupling the spinon-pair and holon condensation transitions merge together and become, unexpectedly, first order.

M. N. Chernodub; E. -M. Ilgenfritz; A. Schiller

2005-12-06T23:59:59.000Z

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181

Magneto-optical studies of magnetization processes in high-Tc superconductors structure.  

SciTech Connect (OSTI)

Magneto-optical imaging is a powerful tool for nondestructive quality control and scientific research through visualization of magnetic fields around any magnetic flux or current carrying sample. It allows real time observations of domain structures and their transformations in magnetics, static and dynamic field patterns due to inhomogeneous currents in electric circuits and superconductors, and reveals distortions of the fields due to defects. In addition to qualitative pictures showing different details in the intensities of the magneto-optical images, one can obtain quantitative maps of field distributions and retrieve values of the underlying currents or magnetization variations. In this review we discuss the advantages of magneto-optics for studies of superconductors, show its place among other techniques, and report recent results in magneto-optical investigations of high temperature superconductors (HTS).

Vlasko-Vlasox, V. K.

1998-12-02T23:59:59.000Z

182

Structural phase transition in ZrO2 induced by swift heavy ion irradiation at high pressure  

E-Print Network [OSTI]

Structural phase transition in ZrO2 induced by swift heavy ion irradiation at high pressure B transition becomes larger with increasing pressure. Keywords: Zirconia, phase transition, high pressure-temperature poly- morphs (tetragonal and cubic) (see Fig 1). At about 1200 C, a martensitic-type phase transition

Paris-Sud XI, Université de

183

High-temperature stability, structure and thermoelectric properties of CaMn1xNbxO3 phases  

E-Print Network [OSTI]

technologies such as solid oxide fuel cells, thermoelectric (TE) modules and high-temperature superconductorsHigh-temperature stability, structure and thermoelectric properties of CaMn1?xNbxO3 phases Laura diffraction and electron diffraction data. Thermogravi- metric heating/cooling studies showed a reversible

184

GulyaevBleustein Waves in a Layered Structure of Piezoelectric Periodic Granular High-Temperature Superconductor Structure  

Science Journals Connector (OSTI)

Bragg's interactions of GulyaevBleustein surface waves with a periodic granular high-temperature superconducting medium are studied. Dispersion equations describing the characteristics of surface acoustoelect...

V. A. Krakovskii

2001-06-01T23:59:59.000Z

185

Structure of W3(OH) from Very High Spectral Resolution Observations of 5 Centimeter OH Masers  

E-Print Network [OSTI]

Recent studies of methanol and ground-state OH masers at very high spectral resolution have shed new light on small-scale maser processes. The nearby source W3(OH), which contains numerous bright masers in several different transitions, provides an excellent laboratory for high spectral resolution techniques. We present a model of W3(OH) based on EVN observations of the rotationally-excited 6030 and 6035 MHz OH masers taken at 0.024 km/s spectral resolution. The 6.0 GHz masers are becoming brighter with time and show evidence for tangential proper motions. We confirm the existence of a region of magnetic field oriented toward the observer to the southeast and find another such region to the northeast in W3(OH), near the champagne flow. The 6.0 GHz masers trace the inner edge of a counterclockwise rotating torus feature. Masers at 6030 MHz are usually a factor of a few weaker than at 6035 MHz but trace the same material. Velocity gradients of nearby Zeeman components are much more closely correlated than in the ground state, likely due to the smaller spatial separation between Zeeman components. Hydroxyl maser peaks at very long baseline interferometric resolution appear to have structure on scales both smaller than that resolvable as well as on larger scales.

Vincent L. Fish; Lornt O. Sjouwerman

2007-06-22T23:59:59.000Z

186

Synthesis, structural characterization and high pressure phase transitions of monolithium hydronium sulfate  

SciTech Connect (OSTI)

A three dimensional lithium hydronium sulfate LiSO{sub 4}{center_dot}H{sub 3}O [1], [space group Pna2{sub 1}a=8.7785(12) A, b=9.1297(12) A, c=5.2799(7) A, V=423.16(10) A{sup 3}] was synthesized via solvothermal methods using 1,5-naphthalenedisulfonic acid (1,5-NSA) as the source of sulfate ions. The structure of [1], determined by single crystal X-ray diffraction techniques, consists of corner sharing LiO{sub 4} and SO{sub 4} tetrahedra, forming an anionic 3-D open framework that is charge balanced by hydronium ions positioned within channels running along [001] and forming strong H-bonding with the framework oxygen atoms. Compound [1] undergoes two reversible phase transitions, involving reorientation of SO{sub 4}{sup 2-} ions at pressures of approximately 2.5 and 5 GPa at room temperature, as evident from characteristic discontinuous frequency drops in the {nu}{sub 1} mode of the Raman spectra. Additionally, compound [1] forms dense {beta}-lithium sulfate at 300 Degree-Sign C, as evident from temperature dependent powder XRD and combined reversible TGA-DSC experiments. - Graphical abstract: Left: View of corner-shared LiO{sub 4} and SO{sub 4} tetrahedra along [001] direction with hydronium ions situated in the channels. Right: (a) Photograph of the loaded DAC (b) Ambient pressure Raman spectrum of compound [1] (c) Evolution of the {nu}{sub 1} mode with the increasing and decreasing pressure indicating transitions to high-pressure phases at {approx}2.5 (red curves) and {approx}5 GPa (blue curves) and at {approx}3.5 GPa upon decompression. Highlights: Black-Right-Pointing-Pointer A 3-D lithium hydronium sulfate is synthesized by solvothermal methods. Black-Right-Pointing-Pointer Two high pressure phase transition occurs due to rotation of sulfate groups. Black-Right-Pointing-Pointer The framework undergoes a high temperature structural transformation, to form {beta}-Li{sub 2}SO{sub 4} phase.

Banerjee, Debasis, E-mail: debasis.banerjee@stonybrook.edu [Department of Chemistry, Stony Brook University, Stony Brook 11794-3400 (United States); Plonka, Anna M. [Department of Geosciences, Stony Brook University, Stony Brook 11794-2100 (United States); Kim, Sun Jin [Nano-Materials Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650 (Korea, Republic of); Xu Wenqian [Department of Geosciences, Stony Brook University, Stony Brook 11794-2100 (United States); Parise, John B. [Department of Chemistry, Stony Brook University, Stony Brook 11794-3400 (United States); Mineral Physics Institute, Stony Brook University, Stony Brook, NY 11790-2100 (United States)

2013-01-15T23:59:59.000Z

187

Fabrication of a biomimetic elastic intervertebral disk scaffold using additive manufacturing  

Science Journals Connector (OSTI)

A custom-designed three-dimensional additive manufacturing device was developed to fabricate scaffolds for intervertebral disk (IVD) regeneration. This technique integrated a computer with a device capable of 3D movement allowing for precise motion and control over the polymer scaffold resolution. IVD scaffold structures were designed using computer-aided design to resemble the natural IVD structure. Degradable polyurethane (PU) was used as an elastic scaffold construct to mimic the elastic nature of the native IVD tissue and was deposited at a controlled rate using ultra-fine micropipettes connected to a syringe pump. The elastic PU was extruded directly onto a collecting substrate placed on a freezing stage. The three-dimensional movement of the computer-controlled device combined with the freezing stage enabled precise control of polymer deposition using extrusion. The addition of the freezing stage increased the polymer solution viscosity and hardened the polymer solution as it was extruded out of the micropipette tip. This technique created scaffolds with excellent control over macro- and micro-structure to influence cell behavior, specifically for cell adhesion, proliferation, and alignment. Concentric lamellae were printed at a high resolution to mimic the native shape and structure of the IVD. Seeded cells aligned along the concentric lamellae and acquired cell morphology similar to native tissue in the outer portion of the IVD. The fabricated scaffolds exhibited elastic behavior during compressive and shear testing, proving that the scaffolds could support loads with proper fatigue resistance without permanent deformation. Additionally, the mechanical properties of the scaffolds were comparable to those of native IVD tissue.

Benjamin R Whatley; Jonathan Kuo; Cijun Shuai; Brooke J Damon; Xuejun Wen

2011-01-01T23:59:59.000Z

188

Developing Enzyme and Biomimetic Catalysts for Upgrading Heavy Crudes via Biological Hydrogenation and Hydrodesulfurization  

SciTech Connect (OSTI)

The recovery and conversion of heavy oils is limited due to the high viscosity of these crudes and their high heteroatom content. Conventional technology relies on thermochemical hydrogenation and hydrodesulfurization to address these problems and is energy intensive due to the high operating temperature and pressure. This project was initiated to explore biological catalysts for adding hydrogen to the heavy oil molecules. Biological enzymes are efficient at hydrogen splitting at very mild conditions such as room temperature and pressure, however, they are very specific in terms of the substrates they hydrogenate. The goal of the project was to investigate how the specificity of these enzymes can be altered to develop catalysts for oil upgrading. Three approaches were used. First was to perform chemical modification of the enzyme surface to improve binding of other non-natural substrates. Second approach was to expose the deeply buried catalytic active site of the enzyme by removal of protein scaffolding to enable better interaction with other substrates. The third approach was based on molecular biology to develop genetically engineered systems for enabling targeted structural changes in the enzyme. The first approach was found to be limited in success due to the non-specificity of the chemical modification and inability to target the region near the active site or the site of substrate binding. The second approach produced a smaller catalyst capable of catalyzing hydrogen splitting, however, further experimentation is needed to address reproducibility and stability issues. The third approach which targeted cloning of hydrogenase in alternate hosts demonstrated progress, although further work is necessary to complete the cloning process. The complex nature of the hydrogenase enzyme structure-function relationship and role of various ligands in the protein require significant more research to better understand the enzyme and to enable success in strategies in developing catalysts with broader specificity as that required for crude upgrading.

Borole, A.P.

2006-08-22T23:59:59.000Z

189

X-ray diffuse scattering studies of the local structural inhomogeneities in high temperature superconductors  

E-Print Network [OSTI]

in high temperature superconductors A dissertation submittedChemistry of High-Temperature Superconductors. Word Scienti?work on the high temperature superconductors, one of the

Liu, Xuerong

2009-01-01T23:59:59.000Z

190

High energy spinel-structured cathode stabilized by layered materials for advanced lithium-ion batteries  

Science Journals Connector (OSTI)

Abstract Due to well-known JahnTeller distortion in spinel LiMn1.5Ni0.5O4, it can only be reversibly electrochemically cycled between 3 and 4.8V with a limited reversible capacity of ?147mAhg?1. This study intends to embed the layer-structured Li2MnO3 nanodomains into LiMn1.5Ni0.5O4 spinel matrix so that the JahnTeller distortion can be suppressed even when the average Mn oxidation state is below+3.5. A series of xLi2MnO3(1?x)LiMn1.5Ni0.5O4 where x=0, 0.1, 0.2, 0.3, 0.4, 0.5 and 1 are synthesized by co-precipitation method. The composites with intermediate values of x=0.1, 0.2, 0.3, 0.4 and 0.5 exhibit both spinel and layered structural domains in the particles and show greatly improved cycle stability than that of the pure spinel. Among them, 0.3Li2MnO30.7LiMn1.5Ni0.5O4 delivers the highest and almost constant capacity after a few conditional cycles and shows superior cycle stability. Ex-situ X-ray diffraction results indicate that no JahnTeller distortion occurs during the cycling of the 0.3Li2MnO30.7LiMn1.5Ni0.5O4 composite. Additionally, 0.3Li2MnO30.7LiMn1.5Ni0.5O4 possesses a high energy density of ?700Whkg?1, showing great promise for advanced high energy density lithium-ion batteries.

Jia Lu; Ya-Lin Chang; Bohang Song; Hui Xia; Jer-Ren Yang; Kim Seng Lee; Li Lu

2014-01-01T23:59:59.000Z

191

Structural Evidence for a Fast-Ion Transition in the High-Pressure Rocksalt Phase of Silver Iodide  

Science Journals Connector (OSTI)

This Letter describes neutron diffraction measurements of the rocksalt structured phase of AgI at high pressure and temperature and the structural disorder which accompanies its high conductivity. In contrast to the first-order structural phase transition which results in fast-ionic ?-AgI at ambient pressure, the fast-ionic behavior in rocksalt structured AgI occurs above a diffuse transition with a small anomaly in lattice parameter and a continuous increase in occupation of interstitial tetrahedral sites with increasing temperature. There are approximately 10 times more defects in the fast-ionic phase of rocksalt AgI than in isostructural AgBr at ambient pressure, 1 K below melting.

D. A. Keen; S. Hull; W. Hayes; N. J. G. Gardner

1996-12-09T23:59:59.000Z

192

Laser spectroscopy of hyperfine structure in highly-charged ions: a test of QED at high fields  

E-Print Network [OSTI]

An overview is presented of laser spectroscopy experiments with cold, trapped, highly-charged ions, which will be performed at the HITRAP facility at GSI in Darmstadt (Germany). These high-resolution measurements of ground state hyperfine splittings will be three orders of magnitude more precise than previous measurements. Moreover, from a comparison of measurements of the hyperfine splittings in hydrogen- and lithium-like ions of the same isotope, QED effects at high electromagnetic fields can be determined within a few percent. Several candidate ions suited for these laser spectroscopy studies are presented.

D. F. A. Winters; M. Vogel; D. M. Segal; R. C. Thompson; W. Noertershaeuser

2007-04-26T23:59:59.000Z

193

X-ray diffuse scattering studies of the local structural inhomogeneities in high temperature superconductors  

E-Print Network [OSTI]

profound and fundamental in?u- ence on electronic propertieselectronic structures signi?cantly and may have profound and fundamental

Liu, Xuerong

2009-01-01T23:59:59.000Z

194

High-resolution Solution Structure of the Catalytic Fragment of Human Collagenase-3 (MMP-13)  

E-Print Network [OSTI]

X-ray structure indicates that the major differences between the structures is associated with loop-1 and MMP-13 exhibit different dynamic properties for the active-site loop and the structural Zn-HCACO, constant time Ca H proton to a-carbon to carbonyl correlation and HACAHB, Ca H proton to a-carbon to Cb H

Powers, Robert

195

On the origin and highly likely completeness of single-domain protein structures  

E-Print Network [OSTI]

for review October 27, 2005) The size and origin of the protein fold universe is of fundamental and practical, with the protein fold universe arising from compact conformations of hydrogen-bonded, second- ary structures of protein structure and function. evolution Protein Data Bank protein folding protein structure prediction

Zhang, Yang

196

High-spin structure and multiphonon {gamma} vibrations in very neutron-rich {sup 114}Ru  

SciTech Connect (OSTI)

High-spin levels of the neutron-rich {sup 114}Ru have been investigated by measuring the prompt {gamma} rays in the spontaneous fission of {sup 252}Cf. The ground-state band and one-phonon {gamma}-vibrational band have been extended up to 14{sup +} and 9{sup +}, respectively. Two levels are proposed as the members of a two-phonon {gamma}-vibrational band. A back bending (band crossing) has been observed in the ground-state band at ({h_bar}/2{pi}){omega}{approx_equal} 0.40 MeV. Using the triaxial deformation parameters, the cranked shell model calculations indicate that this back bending in {sup 114}Ru should originate from the alignment of a pair of h{sub 11/2} neutrons. Triaxial projected shell model calculations for the {gamma}-vibrational band structures of {sup 114}Ru are in good agreement with the experimental data. However, when using the oblate deformation parameters, both of the above-calculated results are not in agreement with the experimental data.

Yeoh, E. Y.; Wang, J. G.; Ding, H. B.; Gu, L.; Xu, Q.; Xiao, Z. G. [Department of Physics, Tsinghua University, Beijing 100084 (China); Zhu, S. J. [Department of Physics, Tsinghua University, Beijing 100084 (China); Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Hamilton, J. H.; Li, K.; Ramayya, A. V.; Hwang, J. K. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Liu, Y. X. [School of Science, Huzhou Teachers College, Huzhou 313000 (China); Liu, S. H. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States); Sun, Y. [Department of Physics, Shanghai Jiao Tong University, Shanghai 200240 (China); Sheikh, J. A.; Bhat, G. H. [Department of Physics, University of Kashmir, Srinagar 190 006 (India); Luo, Y. X. [Department of Physics, Vanderbilt University, Nashville, Tennessee 37235 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Rasmussen, J. O.; Lee, I. Y. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Ma, W. C. [Department of Physics, Mississippi State University, Mississippi State, Mississippi 39762 (United States)

2011-05-15T23:59:59.000Z

197

Effect of buffer structures on AlGaN/GaN high electron mobility transistor reliability  

SciTech Connect (OSTI)

AlGaN/GaN high electron mobility transistors (HEMTs) with three different types of buffer layers, including a GaN/AlGaN composite layer, or 1 or 2 lm GaN thick layers, were fabricated and their reliability compared. The HEMTs with the thick GaN buffer layer showed the lowest critical voltage (Vcri) during off-state drain step-stress, but this was increased by around 50% and 100% for devices with the composite AlGaN/GaN buffer layers or thinner GaN buffers, respectively. The Voff - state for HEMTs with thin GaN and composite buffers were 100 V, however, this degraded to 50 60V for devices with thick GaN buffers due to the difference in peak electric field near the gate edge. A similar trend was observed in the isolation breakdown voltage measurements, with the highest Viso achieved based on thin GaN or composite buffer designs (600 700 V), while a much smaller Viso of 200V was measured on HEMTs with the thick GaN buffer layers. These results demonstrate the strong influence of buffer structure and defect density on AlGaN/GaN HEMT performance and reliability.

Liu, L. [University of Florida, Gainesville; Xi, Y. Y. [University of Florida, Gainesville; Ren, F. [University of Florida; Pearton, S. J. [University of Florida; Laboutin, O. [Kopin Corporation, Taunton, MA; Cao, Yu [Kopin Corporation, Taunton, MA; Johnson, Wayne J. [Kopin Corporation, Taunton, MA; Kravchenko, Ivan I [ORNL

2012-01-01T23:59:59.000Z

198

Nanosheet-structured LiV3O8 with high capacity and excellent stability for high energy lithium batteries  

E-Print Network [OSTI]

). More envi- ronmentally benign and sustainable energy-storage systems are desired for future power for high-energy lithium battery applications. 1. Introduction Energy storage and conversion have sources.1­6 Lithium-ion batteries are considered to be the most promising energy-storage systems

Cao, Guozhong

199

High-pressure structure of half-metallic CrO2 B. R. Maddox  

E-Print Network [OSTI]

transition from rutile -CrO2 phase I P42/mnm to orthorhombic -CrO2 phase II CaCl2-like, Pnnm is presented. The transition to the CaCl2 structure, which appears to be second order, occurs at 12±3 GPa without any typically transforms to another sixfold-coordinated structure, CaCl2, or the -PbO2 structure found in shock

Pickett, Warren

200

Impact of fluorine based reactive chemistry on structure and properties of high moment magnetic material  

SciTech Connect (OSTI)

The impact of the fluorine-based reactive ion etch (RIE) process on the structural, electrical, and magnetic properties of NiFe and CoNiFe-plated materials was investigated. Several techniques, including X-ray fluorescence, 4-point-probe, BH looper, transmission electron microscopy (TEM), and electron energy loss spectroscopy (EELS), were utilized to characterize both bulk film properties such as thickness, average composition, Rs, ?, Bs, Ms, and surface magnetic dead layers' properties such as thickness and element concentration. Experimental data showed that the majority of Rs and Bs changes of these bulk films were due to thickness reduction during exposure to the RIE process. ? and Ms change after taking thickness reduction into account were negligible. The composition of the bulk films, which were not sensitive to surface magnetic dead layers with nano-meter scale, showed minimum change as well. It was found by TEM and EELS analysis that although both before and after RIE there were magnetic dead layers on the top surface of these materials, the thickness and element concentration of the layers were quite different. Prior to RIE, dead layer was actually native oxidation layers (about 2?nm thick), while after RIE dead layer consisted of two sub-layers that were about 6?nm thick in total. Sub-layer on the top was native oxidation layer, while the bottom layer was RIE damaged layer with very high fluorine concentration. Two in-situ RIE approaches were also proposed and tested to remove such damaged sub-layers.

Yang, Xiaoyu, E-mail: xiaoyu.yang@wdc.com; Chen, Lifan; Han, Hongmei; Fu, Lianfeng; Sun, Ming; Liu, Feng; Zhang, Jinqiu [Western Digital Corporation, 44100 Osgood Road, Fremont, California 94539 (United States)

2014-05-07T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Nano-scale Composite Hetero-structures: Novel High Capacity Reversible...  

Broader source: Energy.gov (indexed) [DOE]

better cyclability and calendar life in comparison to synthetic graphite * Investigate Nano-structured (nc-Si) and amorphous Si (a-Si) based composite anodes * Improve the...

202

Representing Multi-Parent Organizational Structures for Use in High Performance Computing Resource Scheduling Algorithms.  

E-Print Network [OSTI]

??Historically, organizational structures of many universities and corporations have followed a strictly tree-based, hierarchical model. These organizations are defined with no more than one parent (more)

Brown, Lloyd T 1982-

2010-01-01T23:59:59.000Z

203

Simple structured illumination microscope setup with high acquisition speed by using a spatial light modulator  

Science Journals Connector (OSTI)

We describe a two-beam interference structured illumination fluorescence microscope. The novelty of the presented system lies in its simplicity. A programmable spatial light modulator...

Frster, Ronny; Lu-Walther, Hui-Wen; Jost, Aurlie; Kielhorn, Martin; Wicker, Kai; Heintzmann, Rainer

2014-01-01T23:59:59.000Z

204

Fault structure and kinematics of the Long Valley Caldera region, California, revealed by high-accuracy earthquake hypocenters and  

E-Print Network [OSTI]

Fault structure and kinematics of the Long Valley Caldera region, California, revealed by high that occurred between 1980 and 2000 in the Long Valley caldera area using a double- difference earthquake a series of east/west-striking right-lateral strike-slip faults beneath the caldera's south moat

Waldhauser, Felix

205

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors  

Science Journals Connector (OSTI)

Hierarchically Structured Ni3S2/Carbon Nanotube Composites as High Performance Cathode Materials for Asymmetric Supercapacitors ... Therefore, the active surface area of the Ni3S2 nanoparticles is increased, which further enhances the capacitive performance of the composite electrode. ... nickel sulfide; carbon nanotube; composite; cathode material; asymmetric supercapacitor ...

Chao-Shuan Dai; Pei-Yi Chien; Jeng-Yu Lin; Shu-Wei Chou; Wen-Kai Wu; Ping-Hsuan Li; Kuan-Yi Wu; Tsung-Wu Lin

2013-11-05T23:59:59.000Z

206

Self-Assembly of Virus-Structured High Surface Area Nanomaterials and Their Application as Battery Electrodes  

E-Print Network [OSTI]

Self-Assembly of Virus-Structured High Surface Area Nanomaterials and Their Application as Battery templates produced uniform metal coatings up to 40 nm in thickness. Within a nickel-zinc battery system have uses in an array of applications including electrodes, catalyst supports, thermal barriers, sensor

Rubloff, Gary W.

207

Hierarchically Structured Microspheres for High-Efficiency Rutile TiO2Based Dye-Sensitized Solar Cells  

E-Print Network [OSTI]

candidate for use in water splitting, photo- catalysis, sensors, and dye-sensitized solar cells (DSSCs) overHierarchically Structured Microspheres for High-Efficiency Rutile TiO2Based Dye-Sensitized Solar and the Ostwald ripening process. Dye-sensitized solar cells (DSSCs) assembled by employing these complex rutile

Lin, Zhiqun

208

Self-powered micro-structured solid state neutron detector with very low leakage current and high efficiency  

E-Print Network [OSTI]

Self-powered micro-structured solid state neutron detector with very low leakage current and high helps to reduce the gammas sensitivity. The neutron detec- tion efficiency of such detectors mainly, fabrication, and performance of solid-state neutron detector based on three-dimensional honeycomb-like silicon

Danon, Yaron

209

Structural Reliability of Ceramics at High Temperature: Mechanisms of Fracture and Fatigue Crack Growth  

SciTech Connect (OSTI)

Final report of our DOE funded research program. Aim of the research program was to provide a fundamental basis from which the mechanical reliability of layered structures may be understood, and to provide guidelines for the development of technologically relevant layered material structures with optimum resistance to fracture and subcritical debonding. Progress in the program to achieve these goals is described.

Reinhold H. Dauskardt

2005-08-01T23:59:59.000Z

210

Lithium Diisopropylamide-Mediated Lithiations of Imines: Insights into Highly Structure-Dependent Rates and  

E-Print Network [OSTI]

enolates, their reactivities are quite different. Imine lithiations are orders of magnitude slower than this point by foreshadowing results summarized in Chart 1 and Scheme 1. Chart 1 contains structurally related-carbon. Further investigation of LDA- mediated lithiations of the imines in Chart 1 reveals structure- reactivity

Collum, David B.

211

Receiver protecting device based on microstrip structure with high-temperature superconductor film  

Science Journals Connector (OSTI)

New design of an effective device for protection against high-power electromagnetic pulses has been created based ... third resonator based on a thin film of high-temperature superconductor (HTSC) occurring in th...

B. A. Belyaev; I. V. Govorun; A. A. Leksikov; A. M. Serzhantov

2012-03-01T23:59:59.000Z

212

Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structure Structure functions 1 NOTE: THE FIGURES IN THIS SECTION ARE INTENDED TO SHOW THE REPRESENTATIVE DATA. THEY ARE NOT MEANT TO BE COMPLETE COMPILATIONS OF ALL THE WORLD'S RELIABLE DATA. Q 2 (GeV 2 ) F 2 (x,Q 2 ) * 2 i x H1 ZEUS BCDMS E665 NMC SLAC 10 -3 10 -2 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 10 7 10 8 10 9 10 -1 1 10 10 2 10 3 10 4 10 5 10 6 Figure 16.6: The proton structure function F p 2 measured in electromagnetic scattering of positrons on protons (collider experiments ZEUS and H1), in the kinematic domain of the HERA data, for x > 0.00006 (cf. Fig. 16.9 for data at smaller x and Q 2 ), and for electrons (SLAC) and muons (BCDMS, E665, NMC) on a fixed target. Statistical and systematic errors added in quadrature are shown. The data are plotted as a function of Q 2 in bins of fixed x. Some points have been slightly offset in Q 2 for clarity. The ZEUS binning in x is used in this plot; all other data are rebinned to the x values of

213

Author's personal copy Crystal structure and compressibility of a high-pressure Ti-rich oxide,  

E-Print Network [OSTI]

promising candidate for the development of electrolytes in solid oxide fuel cells. & 2009 Elsevier Ltd. All for solid-oxide-fuel-cell electrolytes, owing to its excellent stability at high temperature, good, solid electrolytes in high-temperature fuel cells, thermal barrier coatings in engines, and high

Downs, Robert T.

214

In vitro high-resolution structural dynamics of single germinating bacterial spores  

Science Journals Connector (OSTI)

...inner and outer spore coats of Bacillus subtilis, which is closely related to B...We have shown previously for Bacillus cereus spores (14) and here for...and functional orthologs to the Bacillus species rodlet structure (not...

Marco Plomp; Terrance J. Leighton; Katherine E. Wheeler; Haley D. Hill; Alexander J. Malkin

2007-01-01T23:59:59.000Z

215

Comparisons on offshore structure responses to random waves using linear and high-order wave theories  

E-Print Network [OSTI]

The predicted responses of an offshore structure when the wave induced kinematics are computed from different estimation methods can change significantly. The sometimes controversial results have recently motivated the development of a new...

Ramos Heredia, Rafael Juda

2012-06-07T23:59:59.000Z

216

Structural transformation of Sb-based high-speed phase-change material  

Science Journals Connector (OSTI)

On heating, amorphous Ag3.1In3.7Sb76.4Te16.5 crystallizes at 416 K in an A7 structure type with atomic sites randomly occupied by the four constituent elements. At 545 K the compound decomposes into two crystalline phases: AgInTe2 is stable up to the melting point, while Sb89Te11 has a modulated layer structure with a temperature-dependent layer period.

Matsunaga, T.

2012-10-23T23:59:59.000Z

217

Acoustically Mounted Microcrystals Yield High-Resolution X-ray Structures  

SciTech Connect (OSTI)

We demonstrate a general strategy for determining structures from showers of microcrystals. It uses acoustic droplet ejection to transfer 2.5 nL droplets from the surface of microcrystal slurries, through the air, onto mounting micromesh pins. Individual microcrystals are located by raster-scanning a several-micrometer X-ray beam across the cryocooled micromeshes. X-ray diffraction data sets merged from several micrometer-sized crystals are used to determine 1.8 {angstrom} resolution crystal structures.

Soares, Alexei S.; Engel, Matthew A.; Stearns, Richard; Datwani, Sammy; Olechno, Joe; Ellson, Richard; Skinner, John M.; Allaire, Marc; Orville, Allen M. (Labcyte); (BNL)

2012-10-25T23:59:59.000Z

218

A reaction-layer mechanism for the delayed failure of micron-scale polycrystalline silicon structural films subjected to high-cycle fatigue loading  

SciTech Connect (OSTI)

A study has been made of high-cycle fatigue in 2um thick structural films of n+- type, polycrystalline silicon for MEMS applications.

Muhlstein, C.L.; Stach, E.A.; Ritchie, R.O.

2001-11-01T23:59:59.000Z

219

Development of High Performance Hybrid Syntactic Foams: Structure and Material Property Characterization.  

E-Print Network [OSTI]

??Syntactic foams are light weight particulate composites that use hollow particles (microballoons) as reinforcement in a polymer resin matrix. High strength microballoons provide closed cell (more)

Maharsia, Rahul R

2005-01-01T23:59:59.000Z

220

Nano-scale Composite Hetero-structures: Novel High Capacity Reversible...  

Broader source: Energy.gov (indexed) [DOE]

year (Phase 2) * Synthesis of high specific capacity anode - Novel Materials Synthesis * bulk crystalline Si, Nanocrystalline Si, Amorphous Si with carbon as a matrix * Nanorods,...

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

High quantum efficiency photocathode simulation for the investigation of novel structured designs  

SciTech Connect (OSTI)

A computer model in CST Studio Suite has been developed to evaluate several novel geometrically enhanced photocathode designs. This work was aimed at identifying a structure that would increase the total electron yield by a factor of two or greater in the 130 keV range. The modeling software was used to simulate the electric field and generate particle tracking for several potential structures. The final photocathode structure has been tailored to meet a set of detector performance requirements, namely, a spatial resolution of <40 ?m and a temporal spread of 110 ps. We present the details of the geometrically enhanced photocathode model and resulting static field and electron emission characteristics.

Opachich, Y. P., E-mail: opachiyp@nv.doe.gov; Ross, P. W.; Huffman, E.; Koch, J. A. [National Security Technologies LLC, Livermore, California 94550 (United States); MacPhee, A. G.; Nagel, S. R.; Bell, P. M.; Bradley, D. K.; Landen, O. L. [Lawrence Livermore National Laboratory, Livermore, California 94551 (United States); Hilsabeck, T. J. [General Atomics, San Diego, California 92121 (United States)

2014-11-15T23:59:59.000Z

222

Atomic structure of the high-temperature O/W(001)-(21) surface  

Science Journals Connector (OSTI)

The surface reconstruction of the W(001) surface in the presence of oxygen has been studied by scanning tunneling microscopy. A two-domain (21) structure with domain size ?30 was observed after the oxygen-covered surface was annealed at >1000 C for <1 min. Tunneling microscopy and spectroscopy results support the missing-row model for the (21) structure; the preferred location for adsorbed oxygen is either the threefold-hollow site or a site on top of a W atom in the second layer.

J. A. Meyer; Y. Kuk; P. J. Estrup; P. J. Silverman

1991-10-15T23:59:59.000Z

223

Structural Investigation of Methane Hydrate Sediments by Microfocus X-ray Computed Tomography Technique under High-Pressure Conditions  

Science Journals Connector (OSTI)

The structure of natural gas hydrate sediments was observed by microfocus X-ray computed tomography (CT). A newly developed high-pressure vessel for the microfocus X-ray CT system was applied to observe the sediments at a temperature above 273 K and under high-pressure conditions. The obtained two-dimensional CT images clearly showed the spatial distribution of the free-gas pore, sand particles, water, and hydrates. These results demonstrated that microfocus X-ray CT can be effective for studying natural gas hydrate sediment samples.

Shigeki Jin; Jiro Nagao; Satoshi Takeya; Yusuke Jin; Junko Hayashi; Yasushi Kamata; Takao Ebinuma; Hideo Narita

2006-01-01T23:59:59.000Z

224

High-Throughput 3D Structural Homology Detection via NMR Resonance Christopher James Langmead  

E-Print Network [OSTI]

's structure experimentally, via X-ray crystallography or Nuclear Magnetic Resonance (NMR), is very costly bipartite graph. Our experiments on real NMR data from 3 different proteins against a database of 4-646-3173. Fax: 603-646-1672. Email: brd@cs.dartmouth.edu Abbreviations used: NMR, nuclear magnetic resonance

Richardson, David

225

Novel Materials and Structures for Super High Efficiency Multi-Junction Solar Cells  

Science Journals Connector (OSTI)

IIIV compound multi-junction solar cells have great potential for space and terrestrial applications because they have high efficiency potential of more than 50% and superior ... bottom cell, we have demonstrate...

Masafumi Yamaguchi; Hidetoshi Suzuki

2009-01-01T23:59:59.000Z

226

Mesoscale Ocean Surface Current Structure Detected by High-Frequency Radar  

Science Journals Connector (OSTI)

The quality and vertical correlation scales of high-frequency (HF) radar-derived ocean surface current measurements from an ocean surface current radar (OSCR) are assessed by comparing surface to subsurface current observations from 11 June to 8 ...

Lynn K. Shay; Hans C. Graber; Duncan B. Ross; Rickey D. Chapman

1995-08-01T23:59:59.000Z

227

Thermal Storage for Energy Efficient Structures (Poteet High School Case Study)  

E-Print Network [OSTI]

Poteet High School, in Mesquite, Texas, is a facility that demonstrates state-of-the-art environmental control through the application of energy conserving technologies relative to architecture, HVAC and lighting. It is also recognized...

Utesch, A. L.

1988-01-01T23:59:59.000Z

228

Improvements on carbon nanotube structures in high-energy density ultracapacitor electrode design  

E-Print Network [OSTI]

Ultracapacitors are a class of electrochemical energy storage device that is gaining significant industrial traction due to their high charging rate and cycle life compared to rechargeable batteries; however, they store ...

Jenicek, David P. (David Pierre)

2014-01-01T23:59:59.000Z

229

Development of optimal diaphragm-based pulsation damper structure for high-pressure GDI pump systems through design of experiments  

Science Journals Connector (OSTI)

This study optimizes the profile of the diaphragms of the pressure pulsation damper structure in a high-pressure GDI pump system that is now under development by applying the design of experiments (DOE) method. Because a high-pressure pulsation ranging from 0 to 10bar reduces the performance of a GDI engine and harms it from a structural point of view, attenuating the large amplitude of the fluid pulsation pressure of the gasoline fuel injected into a GDI pump is necessary. Both the relatively low frequency range of the pressure pulsation, i.e., from 0Hz to 30Hz, inside the GDI engine and the high pressure of the utilized gasoline fuel prevent us from applying the existing pressure pulsation dampers such as a T-filter and Helmholtz resonator. Therefore, automotive companies utilize a new pressure pulsation damper structure called an accumulator, which is filled with gas. In the development of this pressure accumulator, it is crucial to design optimal profiles for the enveloping diaphragms in terms of the pulsation efficiency and mechanical stress for the sake of safety. In order to optimize the profile of the diaphragms used in the accumulator developed for a GDI engine, this research develops a new finite element procedure that considers the pressure variation by assuming the isoenthalpy state of the enveloped gas inside the accumulator. The developed finite element procedure is then integrated with the DOE method to determine the optimal profile for the enveloping structure of the developed accumulator. To validate the performance of the developed accumulator, the optimized accumulator is manufactured and tested.

Juyeong Kim; Gil Ho Yoon; Jinyee Noh; Jongwook Lee; Kyungnam Kim; Hyoungjong Park; Jaekeun Hwang; Yeonhong Lee

2013-01-01T23:59:59.000Z

230

High Sensitivity Combined with Extended Structural Coverage of Labile Compounds via Nanoelectrospray Ionization at Subambient Pressures  

SciTech Connect (OSTI)

Subambient pressure ionization with nanoelectrospray (SPIN) has proven to be effective in producing ions with high efficiency and transmitting them to low pressures for high sensitivity mass spectrometry (MS) analysis. Here we present evidence that not only does the SPIN source improve MS sensitivity but also allows for gentler ionization conditions. The gentleness of a conventional heated capillary electrospray ionization (ESI) source and the SPIN source was compared by the liquid chromatography mass spectrometry (LC-MS) analysis of colominic acid. Colominic acid is a mixture of sialic acid polymers of different lengths containing labile glycosidic linkages between monomer units necessitating a gentle ion source. By coupling the SPIN source with high resolution mass spectrometry and using advanced data processing tools, we demonstrate much extended coverage of sialic acid polymer chains as compared to using the conventional ESI source. Additionally we show that SPIN-LC-MS is effective in elucidating polymer features with high efficiency and high sensitivity previously unattainable by the conventional ESI-LC-MS methods. ?

Cox, Jonathan T.; Kronewitter, Scott R.; Shukla, Anil K.; Moore, Ronald J.; Smith, Richard D.; Tang, Keqi

2014-10-07T23:59:59.000Z

231

A High-Resolution Solid-State NMR Approach for the Structural Studies of Bicelles  

Science Journals Connector (OSTI)

This method does not require a high radio frequency power unlike the presently used rotating-frame separated-local-field (SLF) techniques, such as PISEMA. ... It should be noted that to achieve this resolution a high radio frequency power is not essential unlike with the rotating-frame separated-local-field (SLF) experiments, such as PISEMA,4 SAMMY,5 and HIMSELF. ... 6 In addition, multiple dipolar couplings (including weak couplings) can be measured even in the presence of a strong dipolar coupling, which is not possible with the rotating frame SLF methods. ...

Sergey Dvinskikh; Ulrich Drr; Kazutoshi Yamamoto; Ayyalusamy Ramamoorthy

2006-04-25T23:59:59.000Z

232

Pade-resummed high-order perturbation theory for nuclear structure calculations  

E-Print Network [OSTI]

We apply high-order many-body perturbation theory for the calculation of ground-state energies of closed-shell nuclei using realistic nuclear interactions. Using a simple recursive formulation, we compute the perturbative energy contributions up to 30th order and compare to exact no-core shell model calculations for the same model space and Hamiltonian. Generally, finite partial sums of this perturbation series do not show convergence with increasing order, but tend to diverge exponentially. Nevertheless, through a simple resummation via Pade approximants it is possible to extract rapidly converging and highly accurate results for the ground state energy.

Robert Roth; Joachim Langhammer

2009-10-19T23:59:59.000Z

233

Refined Energetic Ordering for Sulfate-Water (n=3-6) Clusters Using High-Level Electronic Structure Calculations  

SciTech Connect (OSTI)

This work reports refinements of the energetic ordering of the known low-energy structures of sulfate-water clusters SO2? 4 (H2O)n (n = 3?6) using high-level electronic structure methods. Coupled cluster singles and doubles with perturbative triples (CCSD(T)) is used in combination with an estimate of basis set effects up to the complete basis set limit using second order Mller-Plesset theory. Harmonic zero point energy (ZPE), included at the B3LYP/6-311++G** level, was found to have a significant effect on the energetic ordering. Limitations of the ZPE calculations, both due to electronic structure errors, and use of the harmonic approximation, probably constitute the largest remaining errors. Due to the often small energy differences between cluster isomers, and the significant role of ZPE, deuteration can alter the relative energies of low-lying structures, and, when it is applied in conjunction with calculated harmonic ZPEs, even alters the global minimum for n = 4.

Lambrecht, Daniel S.; McCaslin, Laura; Xantheas, Sotiris S.; Epifanovsky, Evgeny; Head-Gordon, Martin P.

2012-10-01T23:59:59.000Z

234

Anomalous elastic behavior and high-pressure structural evolution of zeolite levyne  

Science Journals Connector (OSTI)

...gatta@unimi.it Manuscript handled by Alison Pawley Elastic behavior and high-pressure...several authors (Sheppard et al. 1974; Wise and Tschernich 1976; Galli et al. 1981...Edition). Kluwer Academic, Dordrecht. Wise, W.S. and Tschernich, R.W. (1976...

Giacomo Diego Gatta; Paola Comodi; Pier Francesco Zanazzi; Tiziana Boffa Ballaran

235

Structure and elasticity of serpentine at high-pressure Mainak Mookherjee a,  

E-Print Network [OSTI]

volcanoes, high electrical conductivities, magnetic and seismic anomalies. Using theoretical methods, we. Evidence of pressure- induced hydrogen bonding is absent in serpentine, as evident from reduction of O K is the bulk modulus, prime indicates pressure derivatives, and O refers to zero pressure. Our best

Stixrude, Lars

236

WebPSN: a web server for high-throughput investigation of structural communication in biomacromolecules  

Science Journals Connector (OSTI)

......brief-report Applications Note WebPSN: a web server for high-throughput investigation...implemented WebPSN, a freely available web server that allows the user to easily setup...the method was therefore implemented in a web server (WebPSN) that provides the user......

Michele Seeber; Angelo Felline; Francesco Raimondi; Simona Mariani; Francesca Fanelli

2014-11-01T23:59:59.000Z

237

New measurements of high-momentum nucleons and short-range structures in nuclei  

E-Print Network [OSTI]

We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination of the strength of two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, for the first time, be examined. The data also include the kinematic region where three-nucleon correlations are expected to dominate.

N. Fomin; J. Arrington; R. Asaturyan; F. Benmokhtar; W. Boeglin; P. Bosted; A. Bruell; M. H. S. Bukhari; E. Chudakov; B. Clasie; S. H. Connell; M. M. Dalton; A. Daniel; D. B. Day; D. Dutta; R. Ent; L. El Fassi; H. Fenker; B. W. Filippone; K. Garrow; D. Gaskell; C. Hill; R. J. Holt; T. Horn; M. K. Jones; J. Jourdan; N. Kalantarians; C. E. Keppel; D. Kiselev; M. Kotulla; R. Lindgren; A. F. Lung; S. Malace; P. Markowitz; P. McKee; D. G. Meekins; H. Mkrtchyan; T. Navasardyan; G. Niculescu; A. K. Opper; C. Perdrisat; D. H. Potterveld; V. Punjabi; X. Qian; P. E. Reimer; J. Roche; V. M. Rodriguez; O. Rondon; E. Schulte; J. Seely; E. Segbefia; K. Slifer; G. R. Smith; P. Solvignon; V. Tadevosyan; S. Tajima; L. Tang; G. Testa; R. Trojer; V. Tvaskis; W. F. Vulcan; C. Wasko; F. R. Wesselmann; S. A. Wood; J. Wright; X. Zheng

2012-01-10T23:59:59.000Z

238

Methods for detecting flaring structures in Sagittarius A* with high frequency VLBI  

E-Print Network [OSTI]

The super massive black hole candidate, Sagittarius A*, exhibits variability from radio to X-ray wavelengths on time scales that correspond to < 10 Schwarzschild radii. We survey the potential of millimeter-wavelength VLBI to detect and constrain time variable structures that could give rise to such variations, focusing on a model in which an orbiting hot spot is embedded in an accretion disk. Non-imaging algorithms are developed that use interferometric closure quantities to test for periodicity, and applied to an ensemble of hot-spot models that sample a range of parameter space. We find that structural periodicity in a wide range of cases can be detected on most potential VLBI arrays using modern VLBI instrumentation. Future enhancements of mm/sub-mm VLBI arrays including phased array processors to aggregate VLBI station collecting area, increased bandwidth recording, and addition of new VLBI sites all significantly aid periodicity detection. The methods described herein can be applied to other models of Sagittarius A*, including jet outflows and Magneto-Hydrodynamic accretion simulations.

Sheperd S. Doeleman; Vincent L. Fish; Avery E. Broderick; Abraham Loeb; Alan E. E. Rogers

2008-09-19T23:59:59.000Z

239

Thermo-physical and structural studies of sodium zinc borovanadate glasses in the region of high concentration of modifier oxides  

SciTech Connect (OSTI)

Highlights: ? Highly modified sodium zinc borovanadate glasses. ? Structural model for borovanadate glasses. ? Network forming tendency of ZnO in borovanadate glasses. ? Fragility can be limited to NBO concentration in borovanadate glasses. -- Abstract: This paper reports investigation of Na{sub 2}O and ZnO modified borovanadate glasses in the highly modified regime of compositions. These glasses have been prepared by microwave route. Ultraviolet (UV) and visible, infrared (IR), Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) and Electron Paramagnetic Resonance (EPR) spectroscopies have been used to characterize the speciation in the glasses. Together with the variation of properties such as molar volume and glass transition temperatures, spectroscopic data indicate that at high levels of modification, ZnO tends to behave like network former. It is proposed that the observed variation of all the properties can be reasonably well understood with a structural model. The model considers that the modification and speciation in glasses are strongly determined by the hierarchy of group electronegativities. Further, it is proposed that the width of the transitions of glasses obtained under same condition reflects the fragility of the glasses. An empirical expression has been suggested to quantify fragility on the basis of width of the transition regions.

Chethana, B.K. [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)] [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India); Reddy, C. Narayana [Maharani's Science College for Women, Bangalore 560 001 (India)] [Maharani's Science College for Women, Bangalore 560 001 (India); Rao, K.J., E-mail: kalyajrao@yahoo.co.in [Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012 (India)

2012-07-15T23:59:59.000Z

240

Crump Geyser: High Precision Geophysics & Detailed Structural Exploration & Slim Well Drilling  

Broader source: Energy.gov [DOE]

DOE Geothermal Peer Review 2010 - Presentation. Project objectives: Discover new 260F and 300F geothermal reservoirs in Oregon. To demonstrate the application of high precision geophysics for well targeting. Demonstrate a combined testing approach to Flowing Differential Self Potential (FDSP) and electrical tomography resistivity as a guide to exploration and development. Demonstrate utility and benefits of sump-less drilling for a low environmental impact. Create both short and long term employment through exploration, accelerated development timeline and operation.

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Steel Plate Shear Walls: Efficient Structural Solution for Slender High-Rise in China  

SciTech Connect (OSTI)

The 329.6 meter tall 74-story Jinta Tower in Tianjin, China, is expected, when complete, to be the tallest building in the world with slender steel plate shear walls used as the primary lateral load resisting system. The tower has an overall aspect ratio close to 1:8, and the main design challenge was to develop an efficient lateral system capable of resisting significant wind and seismic lateral loads, while simultaneously keeping wind induced oscillations under acceptable perception limits. This paper describes the process of selection of steel plate shear walls as the structural system, and presents the design philosophy, criteria and procedures that were arrived at by integrating the relevant requirements and recommendations of US and Chinese codes and standards, and current on-going research.

Mathias, Neville; Long, Eric [Skidmore, Owings and Merrill LLP, One Front Street, San Francisco, CA 94111 (United States); Sarkisian, Mark [Skidmore, Owings and Merrill LLP, One Front Street, San Francisco, CA 94111 (United States); Huang Zhihui [Skidmore, Owings and Merrill LLP, One Front Street, San Francisco, CA 94111 (United States)

2008-07-08T23:59:59.000Z

242

Characterization of the coherent structure in a high speed subsonic jet  

E-Print Network [OSTI]

divergent shear flow. He also measured wavelengths and pressure fluctuation amplitudes for different 28, 29 Lau et al. ' made measurements in the modes. flow field of un- excited jets (M = 0. 09-0. 3). They postulated that the flow structure... 0 0 '6 0 0 0 21 0 0 0 0 0 00 p cD 0pp 0 0 0 &530 @ (O 0 0 0 000 00 0 0 0 0 8 0 SI cD 4 \\cd CD X lD dd 3 0o 0 0 0 0 0 a ZZ ~ Present study 38 o Lau et al. 36 Knott and Massey Morris 35 Z3 ~ Morrison o Potter...

Wattanachayakul, Montri

2012-06-07T23:59:59.000Z

243

Magnetic structure of the high temperature superconductor Gd{sub 1x}Th{sub x}FeAsO  

SciTech Connect (OSTI)

The magnetic structure of the high temperature superconductor Gd{sub 1x}Th{sub x}FeAsO (x?=?0, 0.25) has been determined by neutron powder diffraction. The Gd moments were found to order at T{sub N} ? 4?K and to lie in the basal plane, and form alternating ferromagnetic sheets along the c-axis. The orientation of the gadolinium moments in both the doped and undoped compounds has been confirmed using {sup 155}Gd Mssbauer spectroscopy.

Lee-Hone, N. R.; Ryan, D. H., E-mail: dhryan@physics.mcgill.ca [Physics Department and Centre for the Physics of Materials, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8 (Canada); Cadogan, J. M. [School of Physical, Environmental and Mathematical Sciences, UNSW Canberra at the Australian Defence Force Academy, Canberra, BC 2610 (Australia); Sun, Y. L.; Cao, G. H. [Department of Physics, Zhejiang University, Hangzhou 310027 (China)

2014-05-07T23:59:59.000Z

244

Bioenergetics and mechanical actuation analysis with membrane transport experiments for use in biomimetic  

E-Print Network [OSTI]

Bioenergetics and mechanical actuation analysis with membrane transport experiments for use considers the mechanics and bioenergetics of a prototype nastic structure system consisting of an array by the hydrolysis of adenosine triphosphate. After reviewing the biochemistry and bioenergetics of the active

Giurgiutiu, Victor

245

High-spin level structure of {sup 115}Rh: Evolution of triaxiality in odd-even Rh isotopes  

SciTech Connect (OSTI)

High-spin excited states in the neutron-rich nucleus {sup 115}Rh have been identified for the first time by studying prompt {gamma} rays from the spontaneous fission of {sup 252}Cf with the Gammasphere detector array. A new yrast band and a sideband are built in {sup 115}Rh. This level scheme is proposed to be built on the 7/2{sup +} ground state. The existence of a large signature splitting and an yrare band in {sup 115}Rh shows typical features of a triaxially deformed nucleus. The rigid triaxial rotor plus particle model is used to interpret the level structure of {sup 115}Rh. The level energies, the {gamma} branching ratios, the large signature splitting in the yrast band, and the inverted signature splitting in the yrare band in {sup 115}Rh are reproduced very well. Strong K mixing occurs in {sup 115}Rh at high spin.

Liu, S. H. [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); UNIRIB/Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831 (United States); Hamilton, J. H.; Ramayya, A. V.; Brewer, N. T.; Hwang, J. K. [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Gelberg, A. [Institut fuer Kernphysik, Universitaet zu Koeln, D-50937 Cologne (Germany); Gu, L.; Yeoh, E. Y.; Zhu, S. J. [Department of Physics, Tsinghua University, Beijing 100084 (China); Luo, Y. X. [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Rasmussen, J. O. [Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States); Ma, W. C. [Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762 (United States); Daniel, A. V. [Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235 (United States); Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation); Oganessian, Yu. Ts.; Ter-Akopian, G. M. [Joint Institute for Nuclear Research, RU-141980 Dubna (Russian Federation)

2011-07-15T23:59:59.000Z

246

THE STRUCTURAL CHEMISTRY OF MOLYBDENUM IN MODEL HIGH LEVEL NUCLEAR WASTE GLASSES, INVESTIGATED BY MO K-EDGE X-RAY ABSORPTION  

E-Print Network [OSTI]

THE STRUCTURAL CHEMISTRY OF MOLYBDENUM IN MODEL HIGH LEVEL NUCLEAR WASTE GLASSES, INVESTIGATED of molybdenum in model UK high level nuclear waste glasses was investigated by X-ray Absorption Spectroscopy (XAS). Molybdenum K-edge XAS data were acquired from several inactive simulant high level nuclear waste

Sheffield, University of

247

Structural Characterization of the 216-Z-9 Crib Prior to Decontamination and Demolition Using Robot Crawler and High Resolution Photography  

SciTech Connect (OSTI)

The Department of Energy, Richland Operations Office is preparing to conduct a Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) removal action for the decontamination and demolition of the above-grade mining structures and equipment at the 216-Z-9 Crib. An investigation of the condition of the mining complex was initiated to determine constraints necessary for safely conducting the removal of the buildings. While crib headspace chemical analysis and nondestructive analysis of the interior of the buildings was completed to address radiological contamination concerns, the primary concern regarding the removal of the above-grade structures located on the crib cover involves determining the loading capacity and structural integrity of the crib cover slab. Additional concerns included headspace gases and radionuclide contamination. Until the structural analysis was completed, loading limits on the crib cover had been restricted. Photographic documentation revealed the loss of protective tiles and acid resistant coating from the underside of the cover raising a question of concrete stability. The investigation relied heavily on the use of high resolution photography with high intensity lighting for photographic documentation of the underside of the crib cover, followed by structural analysis of the documentation by a team of qualified engineers. Deployment of a robot crawler with attached camera and positioning of a fixed camera were integral to this structural characterization effort. Results of the photographic documentation were of sufficient quality to allow for bounding decisions to be made regarding the loading of the crib cover while performing the demolition of the mining structures (glovebox, excavator, bucket) and the associated buildings. The 216-Z-9 Crib, also known as the 216 Z-9 Recuplex CAW (CA column waste) Waste Disposal Cavern, the Z-9 Trench and the Z-9 Crib was constructed as an engineered trench with an open area beneath a concrete slab. The crib is located near the Plutonium Finishing Plant (PFP) facility, at the Hanford Nuclear Reservation in Eastern Washington State. The crib was used as a disposal site for effluent chemical and radiological wastes from the recovery of uranium and plutonium through extraction or RECUPLEX process, a method that recovered uranium and plutonium from liquid and solid wastes and scraps from other PFP processes. During its operating life, from 1955 through 1962, the Z-9 Crib received liquid wastes totaling approximately four million liters, or one million gallons. Analyses of the crib soil in seven locations to a depth of up to two meters (six feet) beneath the crib floor indicated that the plutonium content of the crib soil ranged from 50 to 150 kg (the highest concentration measured was 34.5 g/L of soil). While performing the structural evaluation of the crib cover, additional characterization information was obtained on the radiological and chemical conditions of the crib and structures. (authors)

Hopkins, A.; Sutter, C.; Klos, D.B. [Fluor Hanford, Richland, WA (United States); Teal, J.A. [Fluor Government Group, Operations West, Richland WA (United States); Oates, L. [Environmental Quality Management, Richland, WA (United States); Bond, F.W. [Washington State Department of Ecology, Richland, WA (United States); Mattlin, E.; Clarke, S. [U.S. Department of Energy, Richland Operations Office, Richland WA (United States)

2008-07-01T23:59:59.000Z

248

A tribological and biomimetic study of potential bone joint repair materials  

E-Print Network [OSTI]

for total joint replacements due to their mechanical strength, high corrosion resistance and biocompatibility. A composite of biodegradable polytrimethylene carbonate, hydroxyl apatite, and nanotubes was investigated for application as a tissue engineering...

Ribeiro, Rahul

2009-05-15T23:59:59.000Z

249

Development of conducting polymer based biomimetic muscles and fabrication techniques for an artificial pectoral fish fin  

E-Print Network [OSTI]

Fish possess a greater degree of agility, maneuverability, and energy efficiency over current underwater vehicles constructed by engineers. Kinematics studies show that a high degree of three-dimensional control of multiple ...

Davidson, S. Naomi (Sarah Naomi)

2005-01-01T23:59:59.000Z

250

Structural phase transitions in EuFe[subscript 2]As[subscript 2] superconductor at low temperatures and high pressures  

SciTech Connect (OSTI)

The crystal structure of EuFe{sub 2}As{sub 2} has been studied up to a pressure of 35 GPa and down to a temperature of 8 K using temperature dependent x-ray diffraction in a diamond anvil cell at a synchrotron source. At 4.3 GPa, we have detected a structural phase transition from a high temperature tetragonal phase with I4/mmm space group to a low temperature orthorhombic phase with Fmmm space group around 120 K. With the application of pressure at a low temperature of 10 K, the orthorhombic phase is suppressed and a phase change to a collapsed tetragonal phase with I4/mmm space group is observed at 11 GPa. This collapsed tetragonal phase is similar to the one observed at ambient temperature and pressure above 8.5 GPa. We have shown that the collapsed tetragonal phase of EuFe{sub 2}As{sub 2} has the same pressure-volume (P-V) equation of state at ambient temperature and at 10 K, implying that the high pressure phase of EuFe{sub 2}As{sub 2} has a negligible thermal expansion coefficient.

Uhoya, Walter O.; Tsoi, Georgiy M.; Vohra, Yogesh K.; McGuire, Michael A.; Sefat, Athena S. (UAB); (ORNL)

2011-09-20T23:59:59.000Z

251

Time Structure of Particle Production in the MERIT High-Power Target Experiment  

SciTech Connect (OSTI)

The MERIT experiment is a proof-of-principle test of a target system for high power proton beam to be used as front-end for a neutrino factory complex or amuon collider. The experiment took data in autumn 2007 with the fast extracted beam from the CERN Proton Synchrotron (PS) to a maximum intensity of about 30 x 10{sup 12} protons per pulse. We report results from the portion of the MERIT experiment in which separated beam pulses were delivered to a free mercury jet target with time intervals between pulses varying from 2 to 700 {micro}s. The analysis is based on the responses of particle detectors placed along side and downstream of the target.

Efthymiopoulos, I.; Fabich, A.; Palm, M.; Lettry, J.; Haug, F.; Pereira, H.; Pernegger, H.; Steerenberg, R.; Grudiev, A.; /CERN; Kirk, H.G.; Park, H.; /Brookhaven /Fermilab /Oak Ridge /Princeton U. /Rutherford

2009-05-01T23:59:59.000Z

252

High-spin structure and electromagnetic transition strengths in 104Cd  

Science Journals Connector (OSTI)

The recoil-distance Doppler-shift and Doppler-shift attenuation techniques were employed to determine for the first time lifetimes of high-spin states in 104Cd in the time range 0.3?ps<~?<~1.2?ns. The nuclei were populated using the compound nucleus reaction 58Ni(50Cr,?4p) and the ? radiation from their decay was detected with the GASP spectrometer. A total of 34 reduced transition probabilities and limits for 18 further transitions were extracted providing a rich basis for a comparison with theoretical calculations. In addition, the lifetime data contained new information urging for a revision of the published level scheme of 104Cd. In particular, a magnetic dipole band recently established and interpreted as magnetic rotation is shown to be not existing. The new experimental results in 104Cd are discussed in the frame of the interacting boson plus broken pair model.

G. A. Mller; A. Jungclaus; O. Yordanov; E. Galindo; M. Hausmann; D. Kast; K. P. Lieb; S. Brant; V. Krsti?; D. Vretenar; A. Algora; F. Brandolini; G. de Angelis; M. De Poli; C. Fahlander; A. Gadea; T. Martinez; D. R. Napoli; A. Dewald; R. Peusquens; H. Tiesler; M. Grska; H. Grawe; P. G. Bizzeti

2001-06-04T23:59:59.000Z

253

Self-Organized Networks and Lattice Effects in High Temperature Superconductors III: Dopant Internal Structure  

E-Print Network [OSTI]

The self-organized dopant percolative filamentary model, entirely orbital in character (no fictive spins), predicted the existence and even the ~ 3 nm diameters of gap nanodomains (discovered by STM) that amazed almost all theorists in this field. Here it explores the self-consistent and self-limiting coupling between dopant sites and gap character. It explains precursive magnetic effects and shows that they are caused by dopant ordering into loops at an onset temperature of order 2Tc. The ordered coupling of these loops by filamentary connectors is reflected by Debye-Waller factors, and it apparently leads to HTSC. The model also resolves the mystery of the vanishing isotope effect, and it explains the origin of the high-energy "waterfall" recently discovered by ARPES, as well as some overlooked infrared anomalies.

J. C. Phillips

2006-11-08T23:59:59.000Z

254

A Project Management and Systems Engineering Structure for a Generation IV Very High Temperature Reactor  

SciTech Connect (OSTI)

The Very High Temperature Reactor (VHTR) will be an advanced, very high temperature (approximately 1000o C. coolant outlet temperature), gas cooled nuclear reactor and is the nearest term of six Generation IV reactor technologies for nuclear assisted hydrogen production. In 2001, the Generation IV International Forum (GIF), a ten nation international forum working together with the Department of Energys (DOE) Nuclear Energy Research Advisory Committee (NERAC), agreed to proceed with the development of a technology roadmap and identified the next generation of nuclear reactor systems for producing new sources of power. Since a new reactor has not been licensed in the United States since the 1970s, the risks are too large for a single utility to assume in the development of an unprecedented Generation IV reactor. The government must sponsor and invest in the research to resolve major first of a kind (FOAK) issues through a full-scale demonstration prior to industry implementation. DOEs primary mission for the VHTR is to demonstrate nuclear reactor assisted cogeneration of electricity and hydrogen while meeting the Generation IV goals for safety, sustainability, proliferation resistance and physical security and economics. The successful deployment of the VHTR as a demonstration project will aid in restarting the now atrophied U.S. nuclear power industry infrastructure. It is envisioned that VHTR project participants will include DOE Laboratories, industry partners such as designers, constructors, manufacturers, utilities, and Generation IV international countries. To effectively mange R&D, engineering, procurement, construction, and operation for this multi-organizational and technologically complex project, systems engineering will be used extensively to ensure delivery of the final product. Although the VHTR is an unprecedented FOAK system, the R&D, when assessed using the Office of Science and Technology Gate Model, falls primarily in the 3rd - Exploratory Development, 4th Advanced Development, and 5th- Engineering Development stages of maturity rather than in the basic and viability stages. Therefore the R&D must be controlled and project driven from the top down to address specific issues of feasibility, proof of design or support of engineering. The design evolution must be through the systems approach including an iterative process of high-level requirements definition, engineering to focus R&D to verify feasibility, requirements development and conceptual design, R&D to verify design and refine detailed requirements for final detailed design. This paper will define a framework for project management and application of systems engineering at the Idaho National Engineering and Environmental Laboratory (INEEL). The VHTR Project includes an overall reactor design and construction activity and four major supporting activities: fuel development and qualification, materials selection and qualification, NRC licensing and regulatory support, and the hydrogen production plant.

Ed Gorski; Dennis Harrell; Finis Southworth

2004-09-01T23:59:59.000Z

255

Co-pyrolysis of oil shale and High density polyethylene: Structural characterization of the oil  

Science Journals Connector (OSTI)

This study describes a detailed characterization of the oil obtained by co-pyrolysis of Tarfaya oil shale (Morocco) and high density polyethylene (HDPE) and by pyrolysis of oil shale and HDPE individually. The oil (obtained under the most suitable conditions, temperature of 500525C and heating rate of 10C/min) was characterised by elemental analysis, nuclear magnetic resonance spectroscopy (1H NMR) and Fourier transform infrared spectroscopy (FTIR). In addition, column chromatography was used group composition of oil was determined. Gas chromatography was achieved on n-hexane fractions. Adding HDPE to the oil shale results in increased oil yields, which indicates synergetic effect between the oil shale and HDPE. The addition of HDPE to oil shale improved fuel properties of shale oil leading to a decrease in the oxygen content of shale oil. The results show that the oil obtained by co-pyrolysis has similar properties with commercial gasoline. HDPE acts as a hydrogenation medium for the oil shale product as revealed by FTIR results.

A. Aboulkas; T. Makayssi; L. Bilali; K. El harfi; M. Nadifiyine; M. Benchanaa

2012-01-01T23:59:59.000Z

256

Edge photoluminescence of single-crystal silicon with a p-n junction: Structures produced by high-efficiency solar cell technology  

Science Journals Connector (OSTI)

The systematic features and kinetics of edge photoluminescence of silicon structures produced by the high-efficiency solar cell technology is studied at different voltages applied to...p-n junction. It is shown t...

A. M. Emelyanov

2011-06-01T23:59:59.000Z

257

Influence of a constant magnetic field on the dispersion of surface magnetostatic waves in a structure consisting of ferrite and granular high-temperature superconductor  

Science Journals Connector (OSTI)

The dispersional properties of a surface magnetostatic wave (MSW) in a laminar structure consisting of ferrite film and a high-temperature superconducting (HTSC) layer are studied in detail. The propagation of...

V. A. Krakovskii; E. S. Kovalenko

1996-06-01T23:59:59.000Z

258

Structural impacts of the 1985 farm bill on typical farms in the Texas Southern High Plains and delta region of Mississippi  

E-Print Network [OSTI]

STRUCTURAL IMPACTS OF THK 1985 FARM BILL ON TYPICAL FARMS IN THK TEXAS SOUTHERN HIGH PLAINS AND DELTA REGION OF MISSISSIPPI A Thesis by CHARLES FREDERICK MILLER Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August 1988 Major Subject: Agricultural Economics STRUCTURAL IMPACTS OF THE 1985 FARM BILL ON TYPICAL FARMS IN THE TEXAS SOUTHERN HIGH PLAINS AND DELTA REGION OF MISSISSIPPI A Thesis by CHARLES FREDERICK...

Miller, Charles Frederick

2012-06-07T23:59:59.000Z

259

Recent Progress in the Structure Determination of GPCRs, a Membrane Protein Family with High Potential as Pharmaceutical Targets  

SciTech Connect (OSTI)

G protein-coupled receptors (GPCRs) constitute a highly diverse and ubiquitous family of integral membrane proteins, transmitting signals inside the cells in response to an assortment of disparate extra-cellular stimuli. Their strategic location on the cell surface and their involvement in crucial cellular and physiological processes turn these receptors into highly important pharmaceutical targets. Recent technological developments aimed at stabilization and crystallization of these receptors have led to significant breakthroughs in GPCR structure determination efforts. One of the successful approaches involved receptor stabilization with the help of a fusion partner combined with crystallization in lipidic cubic phase (LCP). The success of using an LCP matrix for crystallization is generally attributed to the creation of a more native, membrane-like stabilizing environment for GPCRs just prior to nucleation and to the formation of type I crystal lattices, thus generating highly ordered and strongly diffracting crystals. Here they describe protocols for reconstituting purified GPCRs in LCP, performing pre-crystallization assays, setting up crystallization trials in manual mode, detecting crystallization hits, optimizing crystallization conditions, harvesting, and collecting crystallographic data. The protocols provide a sensible framework for approaching crystallization of stabilized GPCRs in LCP, however, as in any crystallization experiment, extensive screening and optimization of crystallization conditions as well as optimization of protein construct and purification steps are required. The process remains risky and these protocols do not necessarily guarantee success.

Cherezov, Vadim; Abola, Enrique; Stevens, Raymond C.

2012-05-09T23:59:59.000Z

260

The Crystal Structure of a High-Spin Oxoiron(IV) Complex and Characterization of Its Self-Decay Pathway  

SciTech Connect (OSTI)

[Fe{sup IV}(O)(TMG{sub 3}tren)]{sup 2+} (1; TMG{sub 3}tren = 1,1,1-tris{l_brace}2-[N{sup 2}-(1,1,3,3-tetramethylguanidino)]ethyl{r_brace}amine) is a unique example of an isolable synthetic S = 2 oxoiron(IV) complex, which serves as a model for the high-valent oxoiron(IV) intermediates observed in nonheme iron enzymes. Congruent with DFT calculations predicting a more reactive S = 2 oxoiron(IV) center, 1 has a lifetime significantly shorter than those of related S = 1 oxoiron(IV) complexes. The self-decay of 1 exhibits strictly first-order kinetic behavior and is unaffected by solvent deuteration, suggesting an intramolecular process. This hypothesis was supported by ESI-MS analysis of the iron products and a significant retardation of self-decay upon use of a perdeuteromethyl TMG{sub 3}tren isotopomer, d{sub 36}-1 (KIE = 24 at 25 C). The greatly enhanced thermal stability of d{sub 36}-1 allowed growth of diffraction quality crystals for which a high-resolution crystal structure was obtained. This structure showed an Fe=O unit (r = 1.661(2) {angstrom}) in the intended trigonal bipyramidal geometry enforced by the sterically bulky tetramethylguanidinyl donors of the tetradentate tripodal TMG{sub 3}tren ligand. The close proximity of the methyl substituents to the oxoiron unit yielded three symmetrically oriented short C-D {hor_ellipsis} O nonbonded contacts (2.38-2.49 {angstrom}), an arrangement that facilitated self-decay by rate-determining intramolecular hydrogen atom abstraction and subsequent formation of a ligand-hydroxylated iron(III) product. EPR and Moessbauer quantification of the various iron products, referenced against those obtained from reaction of 1 with 1,4-cyclohexadiene, allowed formulation of a detailed mechanism for the self-decay process. The solution of this first crystal structure of a high-spin (S = 2) oxoiron(IV) center represents a fundamental step on the path toward a full understanding of these pivotal biological intermediates.

England, J.; Guo, Y; Farquhar, E; Young, Jr., V; Mnck, E; Que, Jr., L

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

high  

Gasoline and Diesel Fuel Update (EIA)

0 0 Summary Our short-term outlook for a wide array of energy prices has been adjusted upward as international and domestic energy supply conditions have tightened. We think that crude oil prices are as likely as not to end the year $2 to $3 per barrel higher than our previous projections. Thus, we think that the probability of West Texas Intermediate costing an average of $30 per barrel or more at midwinter is about 50 percent. On their current track, heating oil prices are likely to be about 30 percent above year-ago levels in the fourth quarter. Prices for Q1 2001 seem more likely now to match or exceed the high level seen in Q1 2000. Tight oil markets this year and an inherent propensity for high gas utilization in incremental power supply have resulted in rising North American natural gas

262

Structure of high-temperature nickel alloy ZhS36VI for single-crystal blades of high-pressure turbines  

Science Journals Connector (OSTI)

The fine structure, phase composition, and segregation inhomogeneity of carbonless single-crystal rhenium-alloyed alloy ZhS36VI in cast and heat-treated conditions are studied. The structural and phase stabili...

V. P. Kuznetsov; V. P. Lesnikov; E. V. Moroz

2008-03-01T23:59:59.000Z

263

Probing the Structure of Jet Driven Core-Collapse Supernova and Long Gamma Ray Burst Progenitors with High Energy Neutrinos  

E-Print Network [OSTI]

Times of arrival of high energy neutrinos encode information about their sources. We demonstrate that the energy-dependence of the onset time of neutrino emission in advancing relativistic jets can be used to extract important information about the supernova/gamma-ray burst progenitor structure. We examine this energy and time dependence for different supernova and gamma-ray burst progenitors, including red and blue supergiants, helium cores, Wolf-Rayet stars, and chemically homogeneous stars, with a variety of masses and metallicities. For choked jets, we calculate the cutoff of observable neutrino energies depending on the radius at which the jet is stalled. Further, we exhibit how such energy and time dependence may be used to identify and differentiate between progenitors, with as few as one or two observed events, under favorable conditions.

Imre Bartos; Basudeb Dasgupta; Szabolcs Marka

2012-06-04T23:59:59.000Z

264

STANFORD, KIRK ALAN. Strengthening of Steel Structures with High Modulus Carbon Fiber Reinforced Polymers (CFRP) Materials: Bond and Development Length Study.  

E-Print Network [OSTI]

ABSTRACT STANFORD, KIRK ALAN. Strengthening of Steel Structures with High Modulus Carbon Fiber. The current research program proposed the use of a new high modulus carbon fiber reinforced polymer (CFRP-up of carbon fiber sheets and the adhesives for bonding of pre-cured laminate strips. The bond behavior of FRP

265

Effect of High-Pressure Impregnation on Structure Variation and Desulfurization Property of a Zn-Based Sorbent Prepared Using Lignite as a Support  

Science Journals Connector (OSTI)

Effect of High-Pressure Impregnation on Structure Variation and Desulfurization Property of a Zn-Based Sorbent Prepared Using Lignite as a Support ... Lignite reserves are relatively abundant in China; however, its utilization is significantly limited because of its high water content and low calorific value. ...

Xiurong Ren; Qiang He; Yurong Dong; Meijun Wang; Liping Chang; Weiren Bao

2014-06-10T23:59:59.000Z

266

Structure and high-temperature properties of Ti{sub 5}Si{sub 3} with interstitial additions  

SciTech Connect (OSTI)

This study was motivated by the fact that previous research on the structure and properties of Ti{sub 5}Si{sub 3} showed unacceptably inconsistent results. The primary reason for these inconsistencies was interstitial contamination of Ti{sub 5}Si{sub 3} by carbon, nitrogen and oxygen. Thus, this study measured the effects that these interstitial atoms have on some of the previously reported properties. These properties include crystalline structure, thermal expansion anisotropy, electronic structure and bonding, and high temperature oxidation resistance. In Chapter 2 of this study, the lattice parameters and atomic positions of Ti{sub 5}Si{sub 3} as a function of carbon, nitrogen or oxygen content were measured via x-ray and neutron diffraction. Comparing these lattice parameters to those reported in other studies on supposedly pure Ti{sub 5}Si{sub 3} confirmed that the majority of the previous studies had samples with a considerable amount of interstitial impurities. In fact, the lattice parameter trends given in Chapter 2 can be used to estimate the types and level of impurities in these studies. Furthermore, Chapter 2 discusses how atomic positions change as interstitial atoms are incorporated into the lattice. These changes in atomic separations suggest that strong bonds form between the interstitial atoms and the surrounding titanium atoms. This is in full agreement with the electronic structure calculations given in Chapter 4. These calculations show that bonding does occur between titanium d-states and interstitial atom p-states at the expense of bonding between some of the titanium and silicon atoms. In addition, carbon seems to be the most strongly bonded interstitial atom. Knowledge of the exact interstitial content and its effect on bonding is important because Chapters 3 and 5 have shown that interstitial atoms have a marked effect on the thermal expansion and oxidation resistance. As discussed in Chapter 3, all interstitial atoms lower the thermal expansion anisotropy of Ti{sub 5}Si{sub 3} due to the formation of bonds between the interstitial atom and the surrounding titanium atoms. Although interstitial atoms do have an effect on the thermal expansion of Ti{sub 5}Si{sub 3}, these effects were not strong enough to explain all the scatter of previous studies. These studies most likely suffered from systematic errors as a result of poor experimental design. The experimental procedure used in this study was designed to significantly reduce these systematic errors.

Williams, Jason

1999-12-01T23:59:59.000Z

267

high  

Gasoline and Diesel Fuel Update (EIA)

0 0 Highlights International Oil Markets Prices. We have raised our world oil price projection by about $2 per barrel for this month because of assumed greater compliance by OPEC to targeted cuts, especially for the second quarter of 2000 (Figure 1). The expected decline in world petroleum inventories continues (Figure 2), and, given the generally stiff resolve of OPEC members to maintain production cuts, any sign of a turnaround in stocks may be postponed until later this year than previously assumed (Q3 instead of Q2). Our current estimate for the average import cost this past January is now $25 per barrel, a nearly $15-per-barrel increase from January 1999. Crude oil prices are expected to remain at relatively high levels for the first half of 2000, but

268

CO2 Capture from Coal-Fired Utility Generation Plant Exhausts and Sequestration by a Biomimetic Route Based on Enzymatic Catalysts-Current Status  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

from Coal-Fired Utility Generation Plant Exhausts, and from Coal-Fired Utility Generation Plant Exhausts, and Sequestration by a Biomimetic Route Based on Enzymatic Catalysis - Current Status Gillian M. Bond (gbond@nmt.edu; 505-835-5653) Margaret-Gail Medina (magail@nmt.edu; 505-835-5229) New Mexico Tech 801 Leroy Socorro, NM 87801 John Stringer (jstringe@epri.com; 650-855-2472) Electric Power Research Institute 3412 Hillview Avenue Palo Alto, CA 94304 F. Arzum Simsek-Ege (fatma.a.simsek-egel@intel.com; 505-893-8694) Intel Corporation Albuquerque, New Mexico Introduction A range of carbon management strategies will have to be implemented if meaningful reductions in CO 2 emissions are to be achieved in response to concerns about global climate change. It is becoming increasingly clear that some form or forms of carbon

269

Structural and electrochemical properties of nanostructured nickel silicides by reduction and silicification of high-surface-area nickel oxide  

SciTech Connect (OSTI)

Graphical abstract: Nanostructured nickel silicides have been synthesized by reduction and silification of high-surface-area nickel oxide, and exhibited remarkably like-noble metal property, lower electric resistivity, and ferromagnetism at room temperature. Highlights: Black-Right-Pointing-Pointer NiSi{sub x} have been prepared by reduction and silification of high-surface-area NiO. Black-Right-Pointing-Pointer The structure of nickel silicides changed with increasing reaction temperature. Black-Right-Pointing-Pointer Si doping into nickel changed the magnetic properties of metallic nickel. Black-Right-Pointing-Pointer NiSi{sub x} have remarkably lower electric resistivity and like-noble metal property. -- Abstract: Nanostructured nickel silicides have been prepared by reduction and silicification of high-surface-area nickel oxide (145 m{sup 2} g{sup -1}) produced via precipitation. The prepared materials were characterized by nitrogen adsorption, X-ray diffraction, thermal analysis, FT-IR spectroscopy, scanning electron microscopy, transmission electron microscopy, magnetic and electrochemical measurements. The nickel silicide formation involves the following sequence: NiO (cubic) {yields} Ni (cubic) {yields} Ni{sub 2}Si (orthorhombic) {yields} NiSi (orthorhombic) {yields} NiSi{sub 2} (cubic), with particles growing from 13.7 to 21.3 nm. The nickel silicides are ferromagnetic at room temperature, and their saturation magnetization values change drastically with the increase of Si content. Nickel silicides have remarkably low electrical resistivity and noble metal-like properties because of a constriction of the Ni d band and an increase of the electronic density of states. The results suggest that such silicides are promising candidates as inexpensive yet functional materials for applications in electrochemistry as well as catalysis.

Chen, Xiao [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China)] [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Zhang, Bingsen [Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society (Germany)] [Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society (Germany); Li, Chuang; Shao, Zhengfeng [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China)] [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China); Su, Dangsheng [Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society (Germany)] [Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society (Germany); Williams, Christopher T. [Department of Chemical Engineering, Swearingen Engineering Center, University of South Carolina (United States)] [Department of Chemical Engineering, Swearingen Engineering Center, University of South Carolina (United States); Liang, Changhai, E-mail: changhai@dlut.edu.cn [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China)] [Laboratory of Advanced Materials and Catalytic Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024 (China)

2012-03-15T23:59:59.000Z

270

Insights into Stress Corrosion Cracking Mechanisms from High-Resolution Measurements of Crack-Tip Structures and Compositions  

SciTech Connect (OSTI)

The fundamental basis for mechanistic understanding and modeling of SCC remains in question for many systems. Specific mechanisms controlling SCC can vary with changes in alloy characteristics, applied/residual stress or environmental conditions. The local crack electrochemistry, crack-tip mechanics and material metallurgy are the main factors controlling crack growth. These localized properties are difficult or impossible to measure in active cracks. Nevertheless, it is essential to quantitatively interrogate these crack-tip conditions if mechanistic understanding is to be obtained. A major recent advance has been the ability to investigate SCC cracks and crack tips using high-resolution ATEM techniques. ATEM enables the characterization of SCC cracks including trapped tip solution chemistries, corrosion product/film compositions and structures, and elemental composition gradients and defect microstructures along the crack walls and at the crack tip. A wide variety of methods for imaging and analyses at resolutions down to the atomic level can be used to examine the crack and corrosion film characteristics. Surface films and reaction layers have been examined by cross-sectional TEM techniques, but little work had been conducted on environmentally induced internal cracks until that of Lewis and co-workers [1-3] and the current authors [4-17]. This capability combined with modern ATEM techniques has enabled exciting new insights into corrosion processes occurring at buried interfaces and is being used to identify mechanisms controlling IGSCC in boiling water reactor (BWR) and pressurized water reactor (PWR) components. The objective of this paper is to summarize certain results focused on IGSCC of Fe- base and Ni-base stainless alloys in high-temperature water environments. Representative crack-tip examples will be shown to illustrate specific aspects that are characteristic of SCC in the material/environment combinations. Differences and similarities in crack-tip structures- chemistries will be highlighted comparing Fe-base 316/304SS to Ni-base alloy 600/182 and for tests in oxidizing versus hydrogenated water environments.

Bruemmer, Stephen M.; Thomas, Larry E.

2010-04-05T23:59:59.000Z

271

High energy-resolution electron energy-loss spectroscopy study of the electric structure of double-walled carbon nanotubes  

Science Journals Connector (OSTI)

......spectroscopy study of the electric structure of double-walled...to investigate electric structures of...produced by an arc-discharge method [15...carbon nanotubes in arc discharge. J. Phys. Chem...spectroscopy study of the electric structure of double-walled......

Yohei Sato; Masami Terauchi; Yahachi Saito; Riichiro Saito

2006-06-01T23:59:59.000Z

272

Structural Genomics  

Science Journals Connector (OSTI)

Structural Genomics ... Structural genomics is the field of science focused on the systematic determination of the three-dimensional structure of the proteins encoded into genomes. ... Structural genomics is spreading the philosophy of high throughput in all fields of science and making available new tools to speed up research procedures. ...

Ivano Bertini

2003-03-01T23:59:59.000Z

273

Structure-Property Relationship for Two-Photon Absorbing Multiporphyrins: Supramolecular Assembly of Highly-Conjugated Multiporphyrinic Ladders and Prisms  

SciTech Connect (OSTI)

Two-photon absorption (TPA) phenomena of a series of single-strand as well as supramolecular self-assembled ladders and prisms of highly conjugated ethyne bridged multiporphyrin dimer, trimer, and star shaped pentamer have been investigated. The ligand mediated self-assembled supramolecular structures were characterized by UV-visible spectroscopy and small- and wide-angle X-ray scattering (SAXS/WAXS) analysis. The TPA cross section values of multiporphyrins increase nonlinearly from {approx}100 to {approx}18000 GM with an increased number of porphyrin units and elongated ?-conjugation length by virtue of charge transfer and excited-state cumulenic configurations. The observed opposite TPA behavior between their supramolecular ladder and prism configurations necessitates the importance of interstrand interactions between the multiporphyrinic units and the overall shape of the assembly. Furthermore, the diminished TPA cross section of the pentamer, despite the increased ?-conjugation resulting from duplex formation suggests that destabilizing the essential functional configurations at the cost of elongation of ?-delocalization pathway must cause unfavorable effects. We have also shown that one- and two-photon allowed energy-levels of linear multiporphyrins are nearly isoenergetic and the latter transition originates exclusively from the extent of ?-delocalization within the molecule. The identical TPA maximum position of the trimer and pentamer indicates that the TPA of the pentamer arises only from its basic trimer unit in spite of its extended two-dimensional {pi}-conjugation pathway involving five porphyrinic units.

Easwaramoorthi, Shanmugam; Jang, So Young; Yoon, Zin Seok; Lim, Jong Min; Lee, Cheng-Wei; Mai, Chi-Lun; Liu, Yen-Chun; Yeh, Chen-Yu; Vura-Weis, Josh; Wasielewski, Michael R.; Kim, Dongho (NWU); (Yonsei); (NSHU)

2008-10-03T23:59:59.000Z

274

Micro-structured electrode arrays:: high-frequency discharges at atmospheric pressurecharacterization and new applications  

Science Journals Connector (OSTI)

Micro-structured electrode (MSE) arrays allow to generate large-area uniform glow discharges over a wide pressure range up to atmospheric pressure. The electrode dimensions in the ?m-range realized by means of modern micro-machining and galvanic techniques are small enough to generate sufficiently high electric field strengths to ignite gas discharges applying only moderate radio frequency (RF, 13.56MHz) voltages (80390V in Ne, He, Ar and N2). The non-thermal plasma system is characterized by a special probe measuring the electric parameters. The MSE-driven plasmas show a different behavior from conventional discharge plasmas depending on the pressure and the type of gas. With the MSE arrays as plasma sources, several applications were developed and successfully tested: Plasma chemistry (decomposition of waste gases like CF4) and thin film deposition (e.g. SiO2 layers on various substrates). A new atmospheric pressure application realized in our lab is the sterilization of food packaging materials.

Lutz Baars-Hibbe; Christian Schrader; Philipp Sichler; Thorben Cordes; Karl-Heinz Gericke; Stephanus Bttgenbach; Siegfried Draeger

2004-01-01T23:59:59.000Z

275

The high pressure synthesis and structure of a new aurate, CaAu{sub 2}O{sub 4}  

SciTech Connect (OSTI)

A novel aurate CaAu{sub 2}O{sub 4} has been synthesized by high pressure-temperature technique. The sample was contained in an Au capsule and heated to 1000{approximately}1200{degrees}C at 12{approximately}15 GPa in the split-sphere multi-anvil apparatus (USSA-2000). Electron probe Microanalysis of small crystals indicated an oxide ratio of 0.96(6) CaO:1.01(2) Au{sub 2}O{sub 3}. The compound is pale yellow, with a = 5.991141(1), c = 10.04983(3) {angstrom}, Z = 4, 14{sub 1}/a. The structure was solved using both synchroton x-ray powder diffraction and single crystal x-ray data. It consists of corner-linked AuO{sub 4} square planes and distorted CaO{sub 8} dodecahedra; in the figure Ca{sup 2+} ions (circles) are filled in the cavities surrounded by staggered square planar AuO{sub 4} units.

Park, J.H.; Parise, J.B. [State Univ. of New York, Stony Brook, NY (United States)

1995-12-31T23:59:59.000Z

276

Local structure around rare-earth ions in B{sub 2}O{sub 3} glass at high pressure  

SciTech Connect (OSTI)

Melt quenching of B{sub 2}O{sub 3} with less than 25 mol. % rare-earth oxide (RE{sub 2}O{sub 3}) at ambient pressure results in a milky white glass because of liquid-liquid phase separation into B{sub 2}O{sub 3} and RE{sub 2}O{sub 3}{center_dot}3B{sub 2}O phases. In contrast, we have found that melt quenching under GPa-order pressure realizes a transparent RE-doped B{sub 2}O{sub 3} glass. This study investigates the local structure around the RE ions in the B{sub 2}O{sub 3} glass prepared at 3 GPa using optical measurements and electron-spin-echo envelope modulation spectroscopy. It is shown that the RE-rich microparticles disappear and the RE ions are isolated from each other in a highly symmetric crystal field formed by triangular and tetrahedral boron units. This result is consistent with that extrapolated from the data for RE-doped sodium borate glasses.

Funabiki, Fuji [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)] [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Matsuishi, Satoru [Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)] [Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Hosono, Hideo [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan) [Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Research Center for Strategic Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan); Materials and Structures Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Yokohama, 226-8503 (Japan)

2013-06-14T23:59:59.000Z

277

High-resolution X-ray characterization of mid-IR Al0.45Ga0.55As/GaAs Quantum Cascade Laser structures  

Science Journals Connector (OSTI)

Abstract In this paper, the X-ray diffraction profiles of Quantum Cascade Laser (QCL) structures have been investigated. The examined structures were grown by molecular beam epitaxy. The crystallographic characterization was carried out using high resolution X-ray diffractometer. The information about thickness of individual layers and periodicity of the structures was derived from simulation of diffraction profiles calculated using dynamical diffraction theory. The influence of interface roughness on the shape of satellite peaks was studied. The particular attention has been paid to the analysis of the broadening of satellite peaks. The presented results show that broadening is due to the variation of thickness of individual layers.

J. Kubacka-Traczyk; I. Sankowska; O.H. Seeck; K. Kosiel; M. Bugajski

2014-01-01T23:59:59.000Z

278

High frequency capacitively coupled RF plasma discharge effects on the order/disorder structure of PAN-based carbon fiber  

Science Journals Connector (OSTI)

High-resolution confocal Raman microscopy was used to investigate the effects of nitrogen plasma on unsized high strength (HS) PAN- ... . The fibers were treated by a high frequency (40.68 MHz) capacitively coupl...

mmugl E. Gngr; Sinan Bilikmen

2014-05-01T23:59:59.000Z

279

Designing biomimetic antifouling surfaces  

Science Journals Connector (OSTI)

...extreme environment where wave-swept rocky coasts place substantial hydrodynamic forces...2000) have been studied and modelled for flat surfaces using two- and three-dimensional...to biocorrosion, resulting in increased safety and financial concerns (Busalmen et al...

2010-01-01T23:59:59.000Z

280

Crystal structure of Si3N4Y2O3 examined by a 1 MV high-resolution electron microscope  

Science Journals Connector (OSTI)

The crystal structure of Si3N4Y2O3...prepared by a hot-press is examined in a 1 MV high-resolution electron microscope. The image contrast reveals that it is isostructural with one of the layered silicates, Akermanite

S. Horiuchi; M. Mitomo

1979-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Structural change associated with the incommensurate-normal phase transition in akermanite, Ca2MgSi2O7, at high pressure  

Science Journals Connector (OSTI)

...?The structural changes associated with the incommensurate (IC)-normal (N) phase transition in akermanite have been studied with high-pressure single-...a and c axes are 0.00280(10) and 0.00418(6)?GPa?1 for th...

Hexiong Yang; Robert M. Hazen; Robert T. Downs

1997-09-01T23:59:59.000Z

282

Application of slow-light photonic crystal structures for ultra-high speed all-optical analog-to-digital conversion  

E-Print Network [OSTI]

Application of slow-light photonic crystal structures for ultra-high speed all-optical analog circuits. Proposed usage of such controlled light speed devices includes buffers, synchronizer with the reduction of light speed), and slow-light all-optical nonlinear devices [9, 10] taking advantage

Park, Namkyoo

283

High-temperature formation of concentric fullerene-like structures within foam-like carbon: Experiment and molecular dynamics simulation  

E-Print Network [OSTI]

car- bon ion implantation,4 and arc discharge from a carbon target in water.5 Onionlike structures of concentric fullerene-like structures, car- bon onions can be formed in a variety of harsh environments laser operating at 532 nm, generating 12 ps pulses at a rep- etition rate of 1.5 MHz, with average power

Powles, Rebecca

284

2D and 3D periodic templates through holographic interference lithography : photonic and phononic crystals and biomimetic microlens arrays  

E-Print Network [OSTI]

In this thesis a simple technique for controlling structure via holographic interference lithography was established and implemented. Access to various space groups including such important structures as the level set ...

Ullal, Chaitanya K. (Chaitanya Kishore)

2005-01-01T23:59:59.000Z

285

Potential of the High-Energy Hot Compaction in a Vacuum for Creating Materials with an Ultrafine Structure and High Strength  

Science Journals Connector (OSTI)

The typical form of specimens prepared by high-energy hot pressing in a vacuum using different ... formation, and the physicomechanical properties of different materials in relation to billet heating temperature ...

Anatolii V. Laptev

2001-03-01T23:59:59.000Z

286

High energy-resolution electron energy-loss spectroscopy study of the electric structure of double-walled carbon nanotubes  

Science Journals Connector (OSTI)

......High energy-resolution electron energy-loss spectroscopy study of the...Egerton R F. (1986) Electron Energy-Loss Spectroscopy in the Electron Microscope , Plenum, New York. High energy-resolution electron energy-loss......

Yohei Sato; Masami Terauchi; Yahachi Saito; Riichiro Saito

2006-06-01T23:59:59.000Z

287

Cost viability of a base isolation system for the seismic protection of a steel high-rack structure  

Science Journals Connector (OSTI)

In this study the effects and costs of implementing a base isolation system for the mitigation of the seismic risk of an existing externally-braced steel frame rack structure are analysed by means of nonlinear...

Vojko Kilar; Simon Petrov?i?; David Koren

2013-06-01T23:59:59.000Z

288

High performance computing and communications Grand Challenges program: Computational structural biology. Final report, August 15, 1992--January 14, 1997  

SciTech Connect (OSTI)

The Grand Challenge project consists of two elements: (1) a hierarchical methodology for 3D protein structure prediction; and (2) development of a parallel computing environment, the Protein Folding Workbench, for carrying out a variety of protein structure prediction/modeling computations. During the first three years of this project the author focused on the use of selected proteins from the Brookhaven Protein Data Base (PDB) of known structures to provide validation of the prediction algorithms and their software implementation, both serial and parallel. Two proteins in particular have been selected to provide the project with direct interaction with experimental molecular biology. A variety of site-specific mutagenesis experiments are performed on these two proteins to explore the many-to-one mapping characteristics of sequence to structure.

Solomon, J.E.

1997-10-02T23:59:59.000Z

289

Porter, PaleAle 4.0: high-accuracy prediction of protein secondary structure and relative solvent accessibility  

Science Journals Connector (OSTI)

......selection within the protein structure prediction...larger, more expressive ensembles of cascaded bidirectional...redundancy-reduced subsets of the Protein Data Bank to predict...prediction of intrinsically disordered regions in protein sequences using kernel......

Claudio Mirabello; Gianluca Pollastri

2013-08-15T23:59:59.000Z

290

Structural and dynamical studies of superacids and superacidic solutions using neutron and high energy X-ray scattering.  

E-Print Network [OSTI]

?? The diffusive motions of the Brnsted superacid, hydrogen fluoride, have been studied using quasielastic neutron scattering. Neutron and high energy X-ray diffraction measurements on (more)

Molaison, Jamie John

2006-01-01T23:59:59.000Z

291

ReUcs of samarskite structure in a metamict ABU4 mineral and its high-temperature transformations  

E-Print Network [OSTI]

as a proposed high.temperature samarskite phase with wolframite.type stmcture (s.g. P2/c, a~5.63(]) A,b~9

Downs, Robert T.

292

Generalization of the k?p approach for strained layered semiconductor structures grown on high-index-planes  

Science Journals Connector (OSTI)

We present a generalized theoretical description of the 88 k?p approach for determining the band structure of layered semiconductor structures for any growth direction, including strain and piezoelectric effects. The definition of heavy, light, and splitoff hole states is extended to arbitrary growth directions in analogy to the conventional (001) case, by choosing an adapted set of basis functions. The choice of this basis allows a qualitative understanding of the in-plane band structure and of the optical properties of strained and unstrained structures. Besides, we solve the k?p Hamiltonian by means of an efficient real-space method allowing us to deal with arbitrary confining potentials. The theory is applied to unstrained, compressively strained, and tensilely strained quantum wells. We find that confinement energies, warping, and in-plane effective masses strongly depend on the direction of confinement and on strain. Piezoelectric effects further affect the dispersion for all growth directions other than (001) and (011). We also find that the optical transition strength depends on the in-plane light polarization for growth directions other than (001) and (111). 1996 The American Physical Society.

J. Los; A. Fasolino; A. Catellani

1996-02-15T23:59:59.000Z

293

High-Resolution Mn EXAFS of the Oxygen-Evolving Complex inPhotosystem II: Structural Implications for the Mn4Ca Cluster  

SciTech Connect (OSTI)

The biological generation of oxygen by the oxygen-evolving complex in photosystem II (PS II) is one of natures most important reactions. The recent X-ray crystal structures, while limited by resolutions of 3.2 to 3.5 A, have located the electron density associated with the Mn4Ca complex within the multi-protein PS II complex. Detailed structures critically depend on input from spectroscopic techniques such as EXAFS and EPR/ENDOR, as the XRD resolution does not allow for accurate determination of the position of Mn/Ca or the bridging and terminal ligand atoms. The number and distances of Mn-Mn/Ca/ligand interactions determined from EXAFS provide important constraints for the structure of the Mn cluster. Here we present data from a high-resolution EXAFS method using a novel multi-crystal monochromator that show three short Mn-Mn distances between 2.7 and 2.8 A and hence the presence of three di-mu-oxobridged units in the Mn4Ca cluster. This result imposes clear limitations on the proposed structures based on spectroscopic and diffraction data and provides input for refining such structures.

Yano, Junko; Pushkar, Yulia; Glatzel, Pieter; Lewis, Azul; Sauer,Kenneth; Messinger, Johannes; Bergmann, Uwe; Yachandra, Vittal

2005-09-06T23:59:59.000Z

294

Introducing Bond-Line Organic Structures in High School Biology: An Activity That Incorporates Pleasant-Smelling Molecules  

Science Journals Connector (OSTI)

General Public; High School/Introductory Chemistry; Biochemistry; Interdisciplinary/Multidisciplinary; Organic Chemistry; Computer-Based Learning; Inquiry-Based/Discovery Learning; Food Science; Nomenclature/Units/Symbols ... In addition to its development in our own high school classes, this activity has been implemented by biology teachers at other high schools. ... This project was developed and performed while the authors Andro Rios (Socrates Fellow) and Gerald French (Mentor Teacher) were supported by a National Science Foundation GK-12 grant (NSF 0742551) to the University of California, San Diego (Principal Investigator, Maarten J. Chrispeels). ...

Andro C. Rios; Gerald French

2011-05-06T23:59:59.000Z

295

Application of Neutron Reflectivity for Studies of Biomolecular Structures and Functions at Interfaces  

SciTech Connect (OSTI)

Structures and functions of cell membranes are of central importance in understanding processes such as cell signaling, chemotaxis, redox transformation, biofilm formation, and mineralization occurring at interfaces. This chapter provides an overview of the application of neutron reflectivity (NR) as a unique tool for probing biomolecular structures and mechanisms as a first step toward understanding protein protein, protein lipid, and protein mineral interactions at the membrane substrate interfaces. Emphasis is given to the review of existing literature on the assembly of biomimetic membrane systems, such as supported membranes for NR studies, and demonstration of model calculations showing the potential of NR to elucidate molecular fundamentals of microbial cell mineral interactions and structure functional relationships of electron transport pathways. The increased neutron flux afforded by current and upcoming neutron sources holds promise for elucidating detailed processes such as phase separation, formation of microdomains, and membrane interactions with proteins and peptides in biological systems.

Johs, Alexander [ORNL; Liang, Liyuan [ORNL; Gu, Baohua [ORNL; Ankner, John Francis [ORNL; Wang, Wei [ORNL

2009-01-01T23:59:59.000Z

296

Electrical-Thermal-Structural Coupled Finite Element Model of High Temperature Superconductor for Resistive Type Fault Current Limiters  

Science Journals Connector (OSTI)

A multi-physics finite element model of high-temperature superconductors (HTS) will be presented in this article. The electrical-thermal model is mainly based on Maxwells equation and basic heat transfer equa...

J. Sheng; Y. Chen; B. Lin; L. Ying; Z. Jin

2014-06-01T23:59:59.000Z

297

Structure Design and Test Research on the Electrical Properties of High Voltage Instrumentation Cables for the Fusion Reactor  

Science Journals Connector (OSTI)

The HV instrumentation cable is an important route for the signals transmission from the superconducting magnets to the control system, it should be long term operated at around 4.2K and withstand the high vo...

Qingsheng Gao; Xiongyi Huang; Yuntao Song; Weibin Xi

2014-08-01T23:59:59.000Z

298

High-temperature structural phase transition in the LiCu{sub 2}O{sub 2} multiferroic  

SciTech Connect (OSTI)

The results of thermogravimetric, X-ray diffraction, and electrical studies of LiCu{sub 2}O{sub 2} single crystals in the temperature range 300-1100 K are presented. A reversible first-order phase transition between the orthorhombic and tetragonal phases is found to occur in these single crystals at T = 993 K. A pronounced peak on a differential thermal analysis curve and jumps in the unit cell parameters and the electrical resistivity are detected at the phase-transition temperature. The data on the crystal structure of LiCu{sub 2}O{sub 2} and the phase transition-induced change in the entropy determined in this work are used to conclude that the revealed phase transition is caused by the ordering-disordering of Li{sup +} and Cu{sup 2+} cations in their structural positions.

Kamentsev, K. E.; Bush, A. A., E-mail: aabush@yandex.ru [Moscow State Institute of Radio Engineering, Electronics, and Automation (Technical University) (Russian Federation); Tishchenko, E. A. [Russian Academy of Sciences, Kapitza Institute for Physical Problems (Russian Federation)] [Russian Academy of Sciences, Kapitza Institute for Physical Problems (Russian Federation); Ivanov, S. A. [Karpov Research Institute of Physical Chemistry (Russian Federation)] [Karpov Research Institute of Physical Chemistry (Russian Federation); Ottoson, M. [Uppsala University, Department of Chemistry (Sweden)] [Uppsala University, Department of Chemistry (Sweden); Mathieu, R.; Nordblad, P. [Uppsala University, Department of Engineering Sciences (Sweden)] [Uppsala University, Department of Engineering Sciences (Sweden)

2013-08-15T23:59:59.000Z

299

The surface structure of SrTiO{sub 3} at high temperatures under influence of oxygen  

SciTech Connect (OSTI)

We use low energy electron microscopy to investigate the structure of the SrTiO{sub 3} (001) surface at elevated temperatures and different oxygen pressures. Upon varying the temperature between 500?C and 900?C in oxygen pressures ranging from 10{sup ?9} millibar to 10{sup ?4} millibar, two surface transitions are found to be present. The lower temperature (1 1) ? (2 1) transition that is known to occur in ultrahigh vacuum can be reversed by increasing the oxygen pressure. At higher temperatures, we observe a (2 1) ? disordered (1 1) transition which is irreversible in the experimental parameter range. The observations are expected to have a strong bearing on the growth of interface structures.

Hesselberth, M. B. S.; Molen, S. J. van der; Aarts, J. [Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden (Netherlands)

2014-02-03T23:59:59.000Z

300

High resolution seismic and paleomagnetic study of the structure and sedimentation of Sweet and Phleger Banks, northern Gulf of Mexico  

E-Print Network [OSTI]

and the shallow structure of the salt domes was determined. Two eustatic couplets were identified during the Wisconsin stage of the Pleistocene, and the regressions associated with each couplet produced a river delta in the vicinity of the banks.... The bathymetric expression of Phleger Bank has only existed since the late Wisconsin, whereas Sweet Bank has undergone repeated intervals of growth and dormancy resulting in repeated exposure and burial of the dome. The paleomagnetic data demonstrated...

Singleton, Scott Wayne

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Ab initio studies of high-pressure structural transformations in silica B. B. Karki and M. C. Warren  

E-Print Network [OSTI]

CaCl2 phase occurs at 47 GPa, the transition from the CaCl2 to the Pnc2 structure at 98 GPa of the rutile and CaCl2 phases are determined as a function of pressure. The results are in excellent agreement. In situ Raman spectroscopy3 has revealed the rutile- to-CaCl2 transition at about 50 GPa which is much

Stixrude, Lars

302

Friction stir additive manufacturing for high structural performance through microstructural control in an Mg based WE43 alloy  

Science Journals Connector (OSTI)

Abstract Structural performance is a key challenge pertinent to additive manufacturing. A majority of the current techniques employed for metallic materials involve liquidsolid transformation and their performance is limited by solidification microstructures. Depending on the type of metallic alloy, this can be a serious impediment to structural properties. In this regard, solid-state additive manufacturing techniques have lagged behind. This study is focused on friction stir additive manufacturing (FSAM) as a potential technique to attain structurally efficient magnesium alloys. In this study, a multilayered stack of an Mg based WE43 alloy was built using FSAM at two different welding parameters. Formation of defects is sensitive to the heat input. In addition, dynamic recrystallization led to finer grain size (23?m). Such fine grain size coupled with desirable precipitate characteristics culminated in superior mechanical properties. Maximum hardness of 115HV was obtained in as-fabricated state and increased to 135HV after aging. These levels are similar to Al 2XXX alloys. In fact, in terms of strength, it translates to 400MPa and 17% ductility and is significantly higher than the base material subjected to aging. Mechanical properties have been correlated with detailed microstructural observations. Texture is discussed for a higher heat input sample using orientation imaging microscopy.

S. Palanivel; P. Nelaturu; B. Glass; R.S. Mishra

2015-01-01T23:59:59.000Z

303

The correlation between the radial distribution of high-energetic ions and the structural as well as electrical properties of magnetron sputtered ZnO:Al films  

SciTech Connect (OSTI)

The origin of the pronounced radial distributions of structural and electrical properties of magnetron sputtered ZnO:Al films has been investigated. The film properties were correlated with the radially resolved ion-distribution functions. While the positive ions exhibit low energies and a radial distribution with a maximum intensity opposite the center of the target, the negative ions can have energies up to several hundred eV, depending on the target potential, with a radial distribution with two maxima opposite the erosion tracks. The most prominent positive ion is that of the working gas (Ar{sup +}), while the highest flux of the negative ions is measured for negative oxygen O{sup ?}. The radial distribution of the flux of the high-energetic negative ions can clearly be related to the radial variations of the structural (c-axis lattice parameter, crystallite size) and electronic (resistivity) properties for sputtering from the planar target, which points to the decisive role of the high-energetic negative oxygen ions for the film quality. The relation between the negative ion bombardment and the structural as well as electronic properties can be explained by a qualitative model recently developed by us. The same target has also been investigated in the eroded state. In this case, the limited acceptance angle of the mass spectrometer leads to a misinterpretation of the radial distribution of the flux of the high-energetic negative ions. This effect can be explained by a simulation, based on the assumption that the high-energetic negative ions are mainly accelerated in the cathode (target) sheath perpendicular to the uneven substrate surface.

Bikowski, Andr; Welzel, Thomas; Ellmer, Klaus [Helmholtz-Zentrum Berlin fr Materialien und Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)] [Helmholtz-Zentrum Berlin fr Materialien und Energie GmbH, Institute for Solar Fuels, Hahn-Meitner-Platz 1, D-14109 Berlin (Germany)

2013-12-14T23:59:59.000Z

304

High pressure synthesis and crystal structure of a ternary superconductor Ca{sub 2}Al{sub 3}Si{sub 4} containing layer structured calcium sub-network isomorphous with black phosphorus  

SciTech Connect (OSTI)

The Zintl compound CaAl{sub 2}Si{sub 2} is peritectically decomposed to a mixture of Ca{sub 2}Al{sub 3}Si{sub 4} and aluminum metal at temperatures above 600 Degree-Sign C under a pressure of 5 GPa. The new ternary compound Ca{sub 2}Al{sub 3}Sl{sub 4} crystalizes with the space group Cmc2{sub 1} and the lattice parameters a=5.8846(8), b=14.973(1), and c=7.7966(5) A. The structure is composed of aluminum silicide framework [Al{sub 3}Si{sub 4}] and layer structured [Ca{sub 2}] network interpenetrating with each other. The electron probe microanalysis (EPMA) shows the formation of solid solutions Ca{sub 2}Al{sub 3-x}Si{sub 4+x} (x<0.6). The layer structured [Ca{sub 2}] sub-network is isomorphous with black phosphorus. The new ternary compound shows superconductivity with a transition temperature (T{sub c}) of 6.4 K. The band structure calculation suggests that the superconductivity should occur through the conduction bands mainly composed of 3p orbitals of the aluminum silicide framework. - Graphical abstract: A new ternary superconductor Ca{sub 2}Al{sub 3}Si{sub 4} has been prepared under high pressure and high temperature conditions, which includes layer structured calcium sub-network isomorphous with black phosphorus. Highlights: Black-Right-Pointing-Pointer A typical Zintl compound CaAl{sub 2}Si{sub 2} melts congruently at ambient pressure. Black-Right-Pointing-Pointer Under high pressure CaAl{sub 2}Si{sub 2} decomposes to Ca{sub 2}Al{sub 3}Si{sub 4} and Al at {approx}600 Degree-Sign C. Black-Right-Pointing-Pointer Ca{sub 2}Al{sub 3}Si{sub 4} contains Ca sub-network isomorphous with black phosphorus. Black-Right-Pointing-Pointer Ca{sub 2}Al{sub 3}Si{sub 4} shows superconductivity with a transition temperature of 6.4 K.

Tanaka, Masashi; Zhang, Shuai; Tanaka, Yuki; Inumaru, Kei [Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)] [Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan); Yamanaka, Shoji, E-mail: syamana@hiroshima-u.ac.jp [Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)] [Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527 (Japan)

2013-02-15T23:59:59.000Z

305

1998 SPIE Smart Structures and Materials Conf. Paper #332919/332742 High bandwidth tunability in a smart vibration absorber  

E-Print Network [OSTI]

in a smart vibration absorber Alison B. Flatau, + Marcelo J. Dapino ++ and Frederick T. Calkins Terfenol­D vibration absorber is developed in this paper. An overview of magnetostriction including to achieve high bandwidth tunability in the performance of a Terfenol­D vibration absorber. Keywords

Flatau, Alison B.

306

The Ultimate Structure of Matter: The High Energy Physics Program from the 1950s through the 1980s  

DOE R&D Accomplishments [OSTI]

This discusses the following topics in High Energy Physics: The Particle Zoo; The Strong and the Weak; The Particle Explosion; Deep Inside the Nucleon; The Search for Unity; Physics in Collision; The Standard Model; Particles and the Cosmos; and Practical Benefits.

1990-02-00T23:59:59.000Z

307

Synthesis, structure, and properties of the high-temperature superconductor HgBa2CuO4+?  

Science Journals Connector (OSTI)

We report here the attempted synthesis of (Hg1-xCuy)Ba2CuO4+? (0?x?0.2, 0?y?0.2, y?x) and the results of a detailed characterization of the structural and superconducting properties of the resulting samples. Rietveld refinement of powder x-ray-diffraction data collected on all 15 samples synthesized found no partial Cu occupancy of the Hg site. We therefore conclude that for these samples no solid solution exists and the superconducting phase is simply HgBa2CuO4+?. Only one interstitial oxygen position O(3) was found, located exactly at the center of the Hg plane. An analysis of the structural refinements has produced a number of correlations between the exact location of the Ba2+ cation within the unit cell and a number of important superconducting parameters; these include the occupancy of the O(3) site, the extent of oxidation of the CuO2 planes, and the magnetic penetration depth.

J. P. Hodges; I. Gameson; P. P. Edwards; A. P. Kharel; A. Porch

1997-05-01T23:59:59.000Z

308

Use of surface Brillouin scattering to examine a structural phase transition in carbon-ion-bombarded silicon during high-temperature annealing  

Science Journals Connector (OSTI)

Surface Brillouin scattering (SBS) has been used to monitor a structural transition during high-temperature annealing of silicon previously bombarded at ambient temperature with 100 keV carbon ions with a fluence of 51017 ions/cm2. It was observed that a significant change of the Rayleigh surface wave peak frequency occurred during annealing at 600 C; thereafter the frequency remained essentially constant to 900 C. Raman and SBS measurements of the sample after annealing and recooling to ambient temperature show that the significant change in the Rayleigh mode frequency results from recrystallization of the amorphous silicon layer near the sample surface produced by the ion bombardment. The work demonstrates the potential of SBS to study in situ the structural phase transitions of opaque materials.

X. Zhang; J. D. Comins; A. G. Every; T. E. Derry

2001-12-04T23:59:59.000Z

309

High quality InGaAsP/InP multiple quantum well modulator structures for 1.3 and 1.5 {micro}m applications  

SciTech Connect (OSTI)

The authors report on high quality InGaAsP/InP multiple quantum well structures grown by chemical beam epitaxy with absorption at the 1.3 to 1.5{micro}m range. Transmission profiles with remarkable excitonic features and sharply defined absorption edges for p-i-n samples with as many as 200 periods are shown to be achievable. Very sharp satellite peaks with linewidth comparable with that from the substrate are shown in the x-ray diffraction. The authors use a new method to monitor the substrate temperature which shows excellent results in terms of homogeneity of layer thickness and composition even for structures with a large number periods.

Mendonca, C.A.C. [Univ. Estadual de Campinas-IFGW-DFA-LPD, Sao Paulo (Brazil); Chiu, T.H. [AT and T Bell Labs., Holmdel, NJ (United States)

1996-12-31T23:59:59.000Z

310

Impact of high-oxygen thermal annealing on the structural, optical and electrical properties of ZnO discs made from 20-nm ZnO nanoparticles  

Science Journals Connector (OSTI)

20-nm nanoparticles of zinc oxide (ZnO) were used to make high-density ZnO discs by uniaxial pressing at 4 ton/cm2 pressure and sintering at 1200 C for 1 hour. High-oxygen thermal annealing performed on the ZnO discs was found to have a profound impact especially enhanced grain growth even at a low annealing temperature of only 400 C. Moreover we observed a unique secondary growth of ZnO nanoparticles and growth of multilayer grains that have not been reported elsewhere. The strong solid state reaction during annealing was probably attributed to the high surface area of the 20-nm ZnO nanoparticles that promoted strong surface reaction even at low annealing temperatures. The ZnO discs have been found to contain a very high concentration of structural defects (oxygen vacancies and zinc/oxygen interstitials) that was indicated by the dominant and broad visible photoluminescence (PL) emission in the green band with peaks at (519 - 533) nm and it was found that this visible emission was greatly increased after annealing treatment especially at 800 C. Annealing treatment also was found to improved the grain crystallinity as illustrated by the lowering of intrinsic compressive stress based on the XRD lattice constant and full-wave half-maximum (FWHM) data. The electrical properties of the ZnO discs were also greatly influenced by the annealing treatment especially a big drop in the breakdown voltage from 362 V (as-grown sample) to 170 V (800 C sample). The resistivity also experienced a dramatic drop from 267 k?.cm (as-grown sample) to 74.6 k?.cm (800 C sample). High-oxygen thermal annealing can be employed as a new technique in controlling the breakdown voltage of ZnO discs made from ZnO nanoparticles with improved structural properties.

Rabab Khalid Sendi; Shahrom Mahmud

2012-01-01T23:59:59.000Z

311

Development of a CO?b2?s laser-based system for characterization of high-temperature structural ceramics  

E-Print Network [OSTI]

-based testing systems for high-temperature ceramic materials have limited capabilities. To test in these severe testing environments requires special grips that will withstand the elevated temperatures and the environment. Furthermore, kilns severely restrict... because the time response of the system is not constrained by the thermal inertia of the kiln. ~ Thermal shock to the ceramics can be avoided by using the laser at low power to slowly heat the sainple to the desired temperature. Heating would be done...

Bowman, David Winslow

1991-01-01T23:59:59.000Z

312

Influence of Microstructure on High-Cycle Fatigue of Ti-6Al-4V: Bimodal vs. Lamellar Structures  

E-Print Network [OSTI]

for such failures in Ti-6Al-4V, a commonly used turbine blade alloy, specifically for fan and compressor blades.K. NALLA, B.L. BOYCE, J.P. CAMPBELL, J.O. PETERS, and R.O. RITCHIE The high-cycle fatigue (HCF) of titanium] HCF can result in essentially unpredictable used for blade and disk applications in the front (low

Ritchie, Robert

313

Local indium segregation and band structure in high efficiencygreen light emitting InGaN/GaN diodes  

SciTech Connect (OSTI)

GaN/InGaN light emitting diodes (LEDs) are commercialized for lighting applications because of the cost efficient way that they produce light of high brightness. Nevertheless, there is significant room for improving their external emission efficiency from typical values below 10 percent to more than 50 percent, which are obtainable by use of other materials systems that, however, do not cover the visible spectrum. In particular, green-light emitting diodes fall short in this respect, which is troublesome since the human eye is most sensitive in this spectral range. In this letter advanced electron microscopy is used to characterize indium segregation in InGaN quantum wells of high-brightness, green LEDs (with external quantum efficiency as high as 15 percent at 75 A/cm2). Our investigations reveal the presence of 1-3 nm wide indium rich clusters in these devices with indium concentrations as large as 0.30-0.40 that narrow the band gap locally to energies as small as 2.65 eV.

Jinschek, Joerg R.; Erni, Rolf; Gardner, Nathan F.; Kim, AndrewY.; Kisielowski, Christian

2004-11-23T23:59:59.000Z

314

Self-powered micro-structured solid state neutron detector with very low leakage current and high efficiency  

SciTech Connect (OSTI)

We report on the design, fabrication, and performance of solid-state neutron detector based on three-dimensional honeycomb-like silicon micro-structures. The fabricated detectors use boron filled deep holes with aspect ratio of over 12 and showed a very low leakage current density of {approx}7 Multiplication-Sign 10{sup -7} A/cm{sup 2} at -1 V for device sizes varying from 2 Multiplication-Sign 2 to 5 Multiplication-Sign 5 mm{sup 2}. A thermal neutron detection efficiency of 4.5% {+-} 0.5% with discrimination setting of 500 keV and gamma to neutron sensitivity of (1.1 {+-} 0.1) Multiplication-Sign 10{sup -5} for single layer was measured without external bias for these devices. Monte-Carlo simulation predicts a maximum efficiency of 45% for such devices filled with 95% enriched {sup 10}boron.

Dahal, R. [Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Huang, K. C.; LiCausi, N.; Lu, J.-Q.; Bhat, I. [Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States); Clinton, J.; Danon, Y. [Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180 (United States)

2012-06-11T23:59:59.000Z

315

The structural and mechanical properties of a Cu??Zr??(at. %) alloy processed by High-Velocity-Injection (HVI)  

E-Print Network [OSTI]

) cooling rate, (3) defects and/or defect structure, (4) density and, (5) purity. The samples investigated in this research will be a copper- zirconium alloy of composition Cu Zr (at. ?) . This alloy was chosen because it is a member of a group...+Zr, C E6 8220C 4~0. 2 a~Zr, Cu 3200 2800 u 2600 ur 2400 g O 2200 ~ 2000 ~ i800 ~ l 600 i 100'C piZrCu3 965'C 935'C 895 C )I Sar I I g 47 92PC ~ 'C 1 400 Zr, cu $ ZrCu R O ZrCu~+Cu l200 lO 20 30 40 50 60 70 80 90 l00 WEIGHT...

Hays, Charles C.

2012-06-07T23:59:59.000Z

316

Continuous Crystalline Carbonate Apatite Thin Films. A Biomimetic Guofeng Xu,, Ilhan A. Aksay,, and John T. Groves*,,  

E-Print Network [OSTI]

, Princeton Materials Institute, Princeton UniVersity, Princeton, New Jersey 08544 ReceiVed July 12, 2000 techniques1,2,14 to wet chemical routes.1,2,15-20 The dry physical techniques such as plasma spraying of Chemistry. Princeton Materials Institute. Department of Chemical Engineering. (1) Elliot, J. C. Structure

Aksay, Ilhan A.

317

Proline 107 Is a Major Determinant in Maintaining the Structure of the Distal Pocket and Reactivity of the High-Spin Heme of MauG  

SciTech Connect (OSTI)

The diheme enzyme MauG catalyzes a six-electron oxidation required for posttranslational modification of a precursor of methylamine dehydrogenase (preMADH) to complete the biosynthesis of its protein-derived tryptophan tryptophylquinone (TTQ) cofactor. Crystallographic studies had shown that Pro107, which resides in the distal pocket of the high-spin heme of MauG, changes conformation upon binding of CO or NO to the heme iron. In this study, Pro107 was converted to Cys, Val, and Ser by site-directed mutagenesis. The structures of each of these MauG mutant proteins in complex with preMADH were determined, as were their physical and catalytic properties. P107C MauG was inactive, and the crystal structure revealed that Cys107 had been oxidatively modified to a sulfinic acid. Mass spectrometry revealed that this modification was present prior to crystallization. P107V MauG exhibited spectroscopic and catalytic properties that were similar to those of wild-type MauG, but P107V MauG was more susceptible to oxidative damage. The P107S mutation caused a structural change that resulted in the five-coordinate high-spin heme being converted to a six-coordinate heme with a distal axial ligand provided by Glu113. EPR and resonance Raman spectroscopy revealed this heme remained high-spin but with greatly increased rhombicity as compared to that of the axial signal of wild-type MauG. P107S MauG was resistant to reduction by dithionite and reaction with H{sub 2}O{sub 2} and unable to catalyze TTQ biosynthesis. These results show that the presence of Pro107 is critical in maintaining the proper structure of the distal heme pocket of the high-spin heme of MauG, allowing exogenous ligands to bind and directing the reactivity of the heme-activated oxygen during catalysis, thus minimizing the oxidation of other residues of MauG.

Feng, Manliang; Jensen, Lyndal M.R.; Yukl, Erik T.; Wei, Xiaoxi; Liu, Aimin; Wilmot, Carrie M.; Davidson, Victor L. (Central Florida); (GSU); (Tougaloo); (UMM)

2012-05-09T23:59:59.000Z

318

Structure of high pressure Ca(OD){sub 2} II from powder neutron diffraction: Relationship to the ZrO{sub 2} and EuI{sub 2} structures  

SciTech Connect (OSTI)

The {open_quotes}unquenchable{close_quotes} high pressure form of Ca(OD){sub 2} [Ca(OH){sub 2}II] has been synthesized at 9 GPa and 400{degrees}C and recovered to ambient pressure at cryogenic temperatures. The structure was determined from powder neutron diffraction data using the Rietveld technique. The symmetry is monoclinic P2{sub 1}/c with a = 5.3979(4) {angstrom}, b = 6.0931(4) {angstrom}, c = 5.9852(4) {angstrom}, {beta} = 103.581(6), Z = 4 at 1 atm and 11 K. R{sub wp} = 2.8%, R{sub p} = 1.9%, reduced {chi}{sup 2} = 6.6. for 117 variables. The calcium and oxygen substructure is intermediate between that in {alpha}-PbO{sub 2} and that in fluorite; it was previously described as isostructural with baddeleyite (ZrO{sub 2}), but it is more accurately described as isostructural with EuI{sub 2}. This structure is distinguished by the presence of a 3{sup 6} anion met parallel to (100). Only one of the two kinds of D atoms in the structure shows appreciable hydrogen bonding to O, with a second neighbor D...O distance of 1.91 {angstrom}, and an O-D...O angle of 153.2{degrees}; the other D atom has 3 second-neighbor oxygens near 2.6 {angstrom} away.

Leinenweber, K.; Partin, D.E.; Schuelke, U. [Arziona State Univ., Tempe, AZ (United States)] [and others] [Arziona State Univ., Tempe, AZ (United States); and others

1997-09-01T23:59:59.000Z

319

A Biomimetic Approach to Metal-Organic Frameworks with High H2 Uptake - DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

0 0 DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report Hong-Cai (Joe) Zhou Dept. of Chem., Texas A&M University P.O. Box 30012 College Station, TX 77842-3012 Phone: (979) 845-4034 Email: zhou@mail.chem.tamu.edu DOE Managers HQ: Ned Stetson Phone: (202) 586-9995 Email: Ned.Stetson@ee.doe.gov GO: Jesse Adams Phone: (720) 356-1421 Email: Jesse.Adams@go.doe.gov Contract Number: DE-FC36-07GO17033 Project Start Date: July 1, 2007 Project End Date: June 30, 2013 Fiscal Year (FY) 2012 Objectives Design, synthesis, and characterization of metal-organic * frameworks (MOFs) with potential anchors for active metal centers introduction. Design, synthesis, and optimization of porous polymer * frameworks (PPNs) with different functionalities. These functionalized MOFs and PPNs demonstrate much *

320

Structured Descriptions  

E-Print Network [OSTI]

A descriptive formalism along with a philosophy for its use and expansion are presented wherein descriptions are of a highly structured nature. This descriptive system and the method of recognition are extended to the ...

Gabriel, Richard P.

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

New line classifications in Ho I based on high-precision hyperfine-structure measurement of low levels  

SciTech Connect (OSTI)

Doppler-free laser-fluorescence and laser-rf double-resonance studies have been made of the hyperfine structure (hfs) of four strong, previously unclassified visible lines in Ho I; all are shown to connect with low levels. The hfs of the 4f/sup 11/6s/sup 2/ /sup 4/I/sub 11/2,9/2/ levels is measured in detail, allowing evaluation of the dipole (a/sup 01/, a/sup 12/, a/sup 10/) and quadrupole (b/sup 02/,b/sup 11/,b/sup 13/) hfs radial integrals. The results are in close agreement with the ab initio values of Lindgren and Rosen (Case Stud. Atom. Phys. 4, 93--292 (1974). The value found for b/sup 02/ in the 4f/sup 11/6s/sup 2/ configuration is in reasonable agreement with that of Wyart and Camus (Physica 93C, 227-236 (1978)), thereby confirming their finding of a substantial dependence of this parameter on the number of 4f electrons in the core.

Childs, W.J.; Cok, D.R.; Goodman, L.S.

1983-02-01T23:59:59.000Z

322

Time-Resolved Structural Characterization of Formation and Break-up of Rhodium Clusters Supported in Highly Dealuminated Y Zeolite  

SciTech Connect (OSTI)

Mononuclear rhodium complexes incorporating two ethylene ligands and anchored to dealuminated zeolite Y by two Rh-O bonds were characterized by transient extended X-ray absorption fine structure (EXAFS) spectroscopy and infrared (IR) spectroscopy as they were converted in the presence of H{sub 2}. EXAFS spectra indicate reduction of the rhodium in the complex at 298 K to form rhodium clusters less than 3 {angstrom} in average diameter. Contacting of the resultant clusters with C{sub 2}H{sub 4} led to their oxidative fragmentation, and the process was reversible. When the H{sub 2} treatment was carried out at a higher temperature (373 K), larger clusters formed. The reduction and oxidation of the rhodium were confirmed by X-ray absorption near edge spectra. During the ethylene treatments, ethyl groups formed on the rhodium, as indicated by IR spectra; treatment in H{sub 2} led to hydrogenation of these groups to form ethane, and the ethyl groups are inferred to be intermediates in the catalytic hydrogenation of ethylene. Ethylene in the gas phase helps to stabilize rhodium in the form of mononuclear complexes on the zeolite during catalysis, hindering the cluster formation.

Liang, Ann J.; Gates, Bruce C. (UCD)

2009-06-12T23:59:59.000Z

323

Structure Functions in Deep Inelastic Lepton Scattering: Data from DOE laboratory experiments as compiled in data reviews by the Durham High Energy Physics Database Group  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Gehrmann, Roberts, and Whalley in their 1999 paper, A Compilation of Structure Functions in Deep Inelastic Scattering, published in volume 25 of Journal of Physics G (Nuclear and Particle Physics) note that these data will continue to be relevant to the next generation of hadron colliders. They present data on the unpolarized structure functions F2 and xF3, R D ._L=_T /, the virtual photon asymmetries A1 and A2 and the polarized structure functions g1 and g2, from deep inelastic lepton scattering off protons, deuterium and nuclei. Data are presented in both tabular and graphical format and include predictions based on the MRST98 and CTEQ4 parton distribution functions as well. The data gathered from the relevant collaborations at DOE's Fermilab, SLAC, and JLAB are available, and so are data from related collaborations based at CERN and DESY. The Durham High Energy Physics (HEP) Database Group makes these data, extracted from papers and data reviews, available in one place in an easy-to-access format. These data are also include in the Durham HEP Reaction Data Database which can be searched at http://hepdata.cedar.ac.uk/reaction

Gehrmann, T; Roberts, R.G.; Whalley, M.R.; Durham HEP Database Group

324

Structural characterization of Green River oil-shale at high-pressure using pair distribution function analysis and small angle x-ray scattering.  

SciTech Connect (OSTI)

The compression behavior of a silicate-rich oil shale from the Green River formation in the pressure range 0.0-2.4 GPa was studied using in situ high pressure X-ray pair distribution function (PDF) measurements for the sample contained within a Paris-Edinburgh cell. The real-space local structural information in the PDF, G(r), was used to evaluate the compressibility of the oil shale. Specifically, the pressure-induced reduction in the medium- to long-range atom distances (6-20 {angstrom}) yielded an average sample compressibility corresponding to a bulk modulus of ca. 61-67 GPa. A structural model consisting of a three phase mixture of the principal crystalline oil shale components (quartz, albite and Illite) provided a good fit to the ambient pressure PDF data (R 30.7%). Indeed the features in the PDF beyond 6 {angstrom}, were similarly well fit by a single phase model of the highest symmetry, highly crystalline quartz component.

Locke, D. R.; Chupas, P. J.; Chapman, K. W.; Pugmire, R. J.; Winans, R. E.; Univ. of Utah

2008-01-01T23:59:59.000Z

325

High-pressure synthesis and crystal structure of the lithium borate HP-LiB{sub 3}O{sub 5}  

SciTech Connect (OSTI)

The new lithium borate HP-LiB{sub 3}O{sub 5} was synthesized under high-pressure/high-temperature conditions of 6 GPa and 1050 deg. C in a multianvil press with a Walker-type module. The compound crystallizes in the space group Pnma (no. 62) with the lattice parameters a=829.7(2), b=759.6(2), and c=1726.8(4) pm (Z=16). The high-pressure compound HP-LiB{sub 3}O{sub 5} is built up from a three-dimensional network of BO{sub 4} tetrahedra and BO{sub 3} groups, which incorporates Li{sup +} ions in channels along the b-axis. Band assignments of measured IR- and Raman spectra were done via quantum-mechanical calculations. Additionally, the thermal behavior of HP-LiB{sub 3}O{sub 5} was investigated. - Graphical abstract: The new high-pressure compound HP-LiB{sub 3}O{sub 5} is built up from a three-dimensional network of BO4 tetrahedra and BO{sub 3} groups, which incorporates Li{sup +} ions in channels along the b-axis. In this paper, the synthesis, the crystal structure, and the properties of HP-LiB{sub 3}O{sub 5} are described. Highlights: > Synthesis of a new lithium borate with the composition HP-LiB{sub 3}O{sub 5} at high pressure. > In contrast to the non-centrosymmetric phase LiB{sub 3}O{sub 5}, this high-pressure phase is centrosymmetric. > First example of ternary alkali borates exhibiting threefold bridging oxygen atoms.

Neumair, Stephanie C.; Vanicek, Stefan [Institut fuer Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52a, A-6020 Innsbruck (Austria); Kaindl, Reinhard; Toebbens, Daniel M. [Institut fuer Mineralogie und Petrographie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52, A-6020 Innsbruck (Austria); Wurst, Klaus [Institut fuer Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52a, A-6020 Innsbruck (Austria); Huppertz, Hubert, E-mail: Hubert.Huppertz@uibk.ac.at [Institut fuer Allgemeine, Anorganische und Theoretische Chemie, Leopold-Franzens-Universitaet Innsbruck, Innrain 52a, A-6020 Innsbruck (Austria)

2011-09-15T23:59:59.000Z

326

Partial Spin Ordering and Complex Magnetic Structure in BaYFeO4: A Neutron Diffraction and High Temperature Susceptibility Study  

SciTech Connect (OSTI)

The novel iron-based compound, BaYFeO4, crystallizes in the Pnma space group with two distinct Fe3+ sites, that are alternately corner-shared [FeO5]7 square pyramids and [FeO6]9 octahedra, forming into [Fe4O18]24 rings, which propagate as columns along the b-axis. A recent report shows two discernible antiferromagnetic (AFM) transitions at 36 and 48 K in the susceptibility, yet heat capacity measurements reveal no magnetic phase transitions at these temperatures. An upturn in the magnetic susceptibility measurements up to 400 K suggests the presence of shortrange magnetic behavior at higher temperatures. In this Article, variable-temperature neutron powder diffraction and hightemperature magnetic susceptibility measurements were performed to clarify the magnetic behavior. Neutron powder diffraction confirmed that the two magnetic transitions observed at 36 and 48 K are due to long-range magnetic order. Below 48 K, the magnetic structure was determined as a spin-density wave (SDW) with a propagation vector, k = (0, 0, 1/3), and the moments along the b-axis, whereas the structure becomes an incommensurate cycloid [k = (0, 0, 0.35)] below 36 K with the moments within the bc-plane. However, for both cases the ordered moments on Fe3+ are only of the order 3.0 B, smaller than the expected values near 4.5 B, indicating that significant components of the Fe moments remain paramagnetic to the lowest temperature studied, 6 K. Moreover, new high-temperature magnetic susceptibility measurements revealed a peak maximum at 550 K indicative of short-range spin correlations. It is postulated that most of the magnetic entropy is thus removed at high temperatures which could explain the absence of heat capacity anomalies at the long-range ordering temperatures. Published spin dimer calculations, which appear to suggest a k = (0, 0, 0) magnetic structure, and allow for neither low dimensionality nor geometric frustration, are inadequate to explain the observed complex magnetic structure.

Thompson, Corey [Florida State University, Tallahassee] [Florida State University, Tallahassee; Greedan, John [McMaster University] [McMaster University; Garlea, Vasile O [ORNL] [ORNL; Flacau, Roxana [National Research Council of Canada] [National Research Council of Canada; Tan, Malinda [California State University, Long Beach (CSULB)] [California State University, Long Beach (CSULB); Derakhshan, Shahab [California State University, Long Beach (CSULB)] [California State University, Long Beach (CSULB)

2014-01-01T23:59:59.000Z

327

Computer Aided Multi-scale Design of SiC-Si3N4 Nanoceramic Composites for High-Temperature Structural Applications  

SciTech Connect (OSTI)

It is estimated that by using better and improved high temperature structural materials, the power generation efficiency of the power plants can be increased by 15% resulting in significant cost savings. One such promising material system for future high-temperature structural applications in power plants is Silicon Carbide-Silicon Nitride (SiC-Si{sub 3}N{sub 4}) nanoceramic matrix composites. The described research work focuses on multiscale simulation-based design of these SiC-Si{sub 3}N{sub 4} nanoceramic matrix composites. There were two primary objectives of the research: (1) Development of a multiscale simulation tool and corresponding multiscale analyses of the high-temperature creep and fracture resistance properties of the SiC-Si{sub 3}N{sub 4} nanocomposites at nano-, meso- and continuum length- and timescales; and (2) Development of a simulation-based robust design optimization methodology for application to the multiscale simulations to predict the range of the most suitable phase morphologies for the desired high-temperature properties of the SiC-Si{sub 3}N{sub 4} nanocomposites. The multiscale simulation tool is based on a combination of molecular dynamics (MD), cohesive finite element method (CFEM), and continuum level modeling for characterizing time-dependent material deformation behavior. The material simulation tool is incorporated in a variable fidelity model management based design optimization framework. Material modeling includes development of an experimental verification framework. Using material models based on multiscaling, it was found using molecular simulations that clustering of the SiC particles near Si{sub 3}N{sub 4} grain boundaries leads to significant nanocomposite strengthening and significant rise in fracture resistance. It was found that a control of grain boundary thicknesses by dispersing non-stoichiometric carbide or nitride phases can lead to reduction in strength however significant rise in fracture strength. The temperature dependent strength and microstructural stability was also significantly depended upon the dispersion of new phases at grain boundaries. The material design framework incorporates high temperature creep and mechanical strength data in order to develop a collaborative multiscale framework of morphology optimization. The work also incorporates a computer aided material design dataset development procedure where a systematic dataset on material properties and morphology correlation could be obtained depending upon a material processing scientist's requirements. Two different aspects covered under this requirement are: (1) performing morphology related analyses at the nanoscale and at the microscale to develop a multiscale material design and analyses capability; (2) linking material behavior analyses with the developed design tool to form a set of material design problems that illustrate the range of material design dataset development that could be performed. Overall, a software based methodology to design microstructure of particle based ceramic nanocomposites has been developed. This methodology has been shown to predict changes in phase morphologies required for achieving optimal balance of conflicting properties such as minimal creep strain rate and high fracture strength at high temperatures. The methodology incorporates complex material models including atomistic approaches. The methodology will be useful to design materials for high temperature applications including those of interest to DoE while significantly reducing cost of expensive experiments.

Vikas Tomer; John Renaud

2010-08-31T23:59:59.000Z

328

Time series of high resolution photospheric spectra in a quiet region of the Sun. II. Analysis of the variation of physical quantities of granular structures  

E-Print Network [OSTI]

From the inversion of a time series of high resolution slit spectrograms obtained from the quiet sun, the spatial and temporal distribution of the thermodynamical quantities and the vertical flow velocity is derived as a function of logarithmic optical depth and geometrical height. Spatial coherence and phase shift analyzes between temperature and vertical velocity depict the height variation of these physical quantities for structures of different size. An average granular cell model is presented, showing the granule-intergranular lane stratification of temperature, vertical velocity, gas pressure and density as a function of logarithmic optical depth and geometrical height. Studies of a specific small and a specific large granular cell complement these results. A strong decay of the temperature fluctuations with increasing height together with a less efficient penetration of smaller cells is revealed. The T -T coherence at all granular scales is broken already at log tau =-1 or z~170 km. At the layers beyon...

Puschmann, K G; Vazquez, M; Bonet, J A; Hanslmeier, A; 10.1051/0004-6361:20047193

2012-01-01T23:59:59.000Z

329

High-resolution electron-energy-loss spectroscopy and photoelectron-diffraction studies of the geometric structure of adsorbates on single-crystal metal surfaces  

SciTech Connect (OSTI)

Two techniques which have made important contributions to the understanding of surface phenomena are high resolution electron energy loss spectroscopy (EELS) and photoelectron diffraction (PD). EELS is capable of directly measuring the vibrational modes of clean and adsorbate covered metal surfaces. In this work, the design, construction, and performance of a new EELS spectrometer are described. These results are discussed in terms of possible structures of the O-Cu(001) system. Recommendations for improvements in this EELS spectrometer and guidelines for future spectrometers are given. PD experiments provide accurate quantitative information about the geometry of atoms and molecules adsorbed on metal surfaces. The technique has advantages when used to study disordered overlayers, molecular overlayers, multiple site systems, and adsorbates which are weak electron scatterers. Four experiments were carried out which exploit these advantages.

Rosenblatt, D.H.

1982-11-01T23:59:59.000Z

330

Measurement of the Inclusive e{\\pm}p Scattering Cross Section at High Inelasticity y and of the Structure Function FL  

E-Print Network [OSTI]

A measurement is presented of the inclusive neutral current e\\pm p scattering cross section using data collected by the H1 experiment at HERA during the years 2003 to 2007 with proton beam energies Ep of 920, 575, and 460 GeV. The kinematic range of the measurement covers low absolute four-momentum transfers squared, 1.5 GeV2 < Q2 < 120 GeV2, small values of Bjorken x, 2.9 \\cdot 10-5 < x < 0.01, and extends to high inelasticity up to y = 0.85. The structure function FL is measured by combining the new results with previously published H1 data at Ep = 920 GeV and Ep = 820 GeV. The new measurements are used to test several phenomenological and QCD models applicable in this low Q2 and low x kinematic domain.

Aaron, F D; Andreev, V; Backovic, S; Baghdasaryan, A; Baghdasaryan, S; Barrelet, E; Bartel, W; Behrend, O; Belov, P; Begzsuren, K; Belousov, A; Bizot, J C; Boudry, V; Bozovic-Jelisavcic, I; Bracinik, J; Brandt, G; Brinkmann, M; Brisson, V; Britzger, D; Bruncko, D; Bunyatyan, A; Buschhorn, G; Bylinkin, A; Bystritskaya, L; Campbell, A J; Cantun Avila, K B; Ceccopieri, F; Cerny, K; Cerny, V; Chekelian, V; Cholewa, A; Contreras, J G; Coughlan, J A; Cvach, J; Dainton, J B; Daum, K; Delcourt, B; Delvax, J; De Wolf, E A; Diaconu, C; Dobre, M; Dodonov, V; Dossanov, A; Dubak, A; Eckerlin, G; Egli, S; Eliseev, A; Elsen, E; Favart, L; Fedotov, A; Felst, R; Feltesse, J; Ferencei, J; Fischer, D J; Fleischer, M; Fomenko, A; Gabathuler, E; Gayler, J; Ghazaryan, S; Glazov, A; Goerlich, L; Gogitidze, N; Gouzevitch, M; Grab, C; Grebenyuk, A; Greenshaw, T; Grell, B R; Grindhammer, G; Habib, S; Haidt, D; Helebrant, C; Henderson, R C.W; Hennekemper, E; Henschel, H; Herbst, M; Herrera, G; Hildebrandt, M; Hiller, K H; Hoffmann, D; Horisberger, R; Hreus, T; Huber, F; Jacquet, M; Janssen, X; Jonsson, L; Jung, A W; Jung, H; Kapichine, M; Katzy, J; Kenyon, I R; Kiesling, C; Klein, M; Kleinwort, C; Kluge, T; Knutsson, A; Kogler, R; Kostka, P; Kraemer, M; Kretzschmar, J; Kruger, K; Kutak, K; Landon, M P.J; Lange, W; Lastovicka-Medin, G; Laycock, P; Lebedev, A; Lendermann, V; Levonian, S; Lipka, K; List, B; List, J; Loktionova, N; Lopez-Fernandez, R; Lubimov, V; Makankine, A; Malinovski, E; Marage, P; Martyn, H U; Maxfield, S J; Mehta, A; Meyer, A B; Meyer, H; Meyer, J; Mikocki, S; Milcewicz-Mika, I; Moreau, F; Morozov, A; Morris, J V; Mozer, M U; Mudrinic, M; Muller, K; Naumann, Th; Newman, P R; Niebuhr, C; Nikiforov, A; Nikitin, D; Nowak, G; Nowak, K; Olsson, J E; Osman, S; Ozerov, D; Pahl, P; Palichik, V; Panagoulias, I; Pandurovic, M; Papadopoulou, Th; Pascaud, C; Patel, G D; Perez, E; Petrukhin, A; Picuric, I; Piec, S; Pirumov, H; Pitzl, D; Placakyte, R; Pokorny, B; Polifka, R; Povh, B; Radescu, V; Raicevic, N; Ravdandorj, T; Reimer, P; Rizvi, E; Robmann, P; Roosen, R; Rostovtsev, A; Rotaru, M; Ruiz Tabasco, J E; Rusakov, S; Salek, D; Sankey, D P.C; Sauter, M; Sauvan, E; Schmitt, S; Schoeffel, L; Schoning, A; Schultz-Coulon, H C; Sefkow, F; Shtarkov, L N; Shushkevich, S; Sloan, T; Smiljanic, I; Soloviev, Y; Sopicki, P; South, D; Spaskov, V; Specka, A; Staykova, Z; Steder, M; Stella, B; Stoicea, G; Straumann, U; Sykora, T; Thompson, P D; Toll, T; Tran, T H; Traynor, D; Truol, P; Tsakov, I; Tseepeldorj, B; Tsurin, I; Turnau, J; Urban, K; Valkarova, A; Vallee, C; Van Mechelen, P; Vargas, A; Vazdik, Y; von den Driesch, M; Wegener, D; Wunsch, E; Zacek, J; Zalesak, J; Zhang, Z; Zhokin, A; Zohrabyan, H; Zomer, F

2011-01-01T23:59:59.000Z

331

Identifying surface structural changes in layered Li-excess nickel manganese oxides in high voltage lithium ion batteries: A joint experimental and theoretical study  

SciTech Connect (OSTI)

High voltage cathode materials Li-excess layered oxide compounds Li[Ni{sub x}Li{sub 1/3-2x/3}Mn{sub 2/3-x/3}]O{sub 2} (0 < x < 1/2) are investigated in a joint study combining both computational and experimental methods. The bulk and surface structures of pristine and cycled samples of Li[Ni{sub 1/5}Li{sub 1/5}Mn{sub 3/5}]O{sub 2} are characterized by synchrotron X-Ray diffraction together with aberration corrected Scanning Transmission Electron Microscopy (a-S/TEM). Electron Energy Loss Spectroscopy (EELS) is carried out to investigate the surface changes of the samples before/after electrochemical cycling. Combining first principles computational investigation with our experimental observations, a detailed lithium de-intercalation mechanism is proposed for this family of Li-excess layered oxides. The most striking characteristics in these high voltage high energy density cathode materials are (1) formation of tetrahedral lithium ions at voltage less than 4.45 V and (2) the transition metal (TM) ions migration leading to phase transformation on the surface of the materials. We show clear evidence of a new spinel-like solid phase formed on the surface of the electrode materials after high-voltage cycling. It is proposed that such surface phase transformation is one of the factors contributing to the first cycle irreversible capacity and the main reason for the intrinsic poor rate capability of these materials.

Xu, Bo; Fell, Christopher R.; Chi, Miaofang; Meng, Ying Shirley (ORNL); (Florida); (UCSD)

2011-09-06T23:59:59.000Z

332

A fermi liquid electric structure and the nature of the carriers in high-T/sub c/ cuprates: A photoemission study  

SciTech Connect (OSTI)

We have performed angle-integrated and angle-resolved photoemission measurements at 20 K on well-characterized single crystals of high-T/sub c/ cuprates (both 1:2:3-type and 2:2:1:2-type) cleaved in situ, and find a relatively large, resolution limited Fermi edge which shows large amplitude variations with photon energy, indicative of band structure final state effects. The lineshapes of the spectra of the 1:2:3 materials as a function of photon energy are well reproduced by band structure predictions, indicating a correct mix of 2p and 3d orbitals on the calculations, while the energy positions of the peaks agree with calculated bands only to within /approx/0.5 eV. This may yet prove to reflect the effects of Coulomb correlation. We nevertheless conclude that a Fermi liquid approach to conductivity is appropriate. Angle-resolved data, while still incomplete, suggest agreement with the Fermi surface predicted by the LDA calculations. A BCS-like energy gap is observed in the 2:2:1:2 materials, whose magnitude is twice the weak coupling BCS value (i.e., 2/Delta/ = 7 KT/sub c/). 49 refs., 11 figs.

Arko, A.J.; List, R.S.; Bartlett, R.J.; Cheong, S.W.; Fisk, Z.; Thompson, J.D.; Olson, C.G.; Yang, A.B.; Liu, R.; Gu, C.; Veal, B.W.; Liu, J.Z.; Paulikas, A.P.; Vandervoort, K.; Claus, H.; Campuzano, J.C.; Schirber, J.E.; Shinn, N.D.

1989-01-01T23:59:59.000Z

333

Application of the ultrasonic technique and high-speed filming for the study of the structure of air-water bubbly flows  

SciTech Connect (OSTI)

Multiphase flows are very common in industry, oftentimes involving very harsh environments and fluids. Accordingly, there is a need to determine the dispersed phase holdup using noninvasive fast responding techniques; besides, knowledge of the flow structure is essential for the assessment of the transport processes involved. The ultrasonic technique fulfills these requirements and could have the capability to provide the information required. In this paper, the potential of the ultrasonic technique for application to two-phase flows was investigated by checking acoustic attenuation data against experimental data on the void fraction and flow topology of vertical, upward, air-water bubbly flows in the zero to 15% void fraction range. The ultrasonic apparatus consisted of one emitter/receiver transducer and three other receivers at different positions along the pipe circumference; simultaneous high-speed motion pictures of the flow patterns were made at 250 and 1000 fps. The attenuation data for all sensors exhibited a systematic interrelated behavior with void fraction, thereby testifying to the capability of the ultrasonic technique to measure the dispersed phase holdup. From the motion pictures, basic gas phase structures and different flows patterns were identified that corroborated several features of the acoustic attenuation data. Finally, the acoustic wave transit time was also investigated as a function of void fraction. (author)

Carvalho, R.D.M.; Venturini, O.J.; Tanahashi, E.I. [Universidade Federal de Itajuba (UNIFEI), Itajuba (Brazil); Neves, F. Jr. [Universidade Tecnologica Federal do Parana (UTFPR), Curitiba (Brazil); Franca, F.A. [Universidade Estadual de Campinas (UNICAMP), Campinas (Brazil)

2009-10-15T23:59:59.000Z

334

Polarization-dependent all-optical modulator with ultra-high modulation depth based on a stereo graphene-microfiber structure  

E-Print Network [OSTI]

We report an in-line polarization-dependent all-optical fiber modulator based on a stereo graphene-microfiber structure (GMF) by utilizing the lab-on-rod technique. Owing to the unique spring-like geometry, an ultra-long GMF interaction length can be achieved, and an ultra-high modulation depth (MD) of ~7.5 dB and a high modulation efficiency (ME) of ~0.2 dB/mW were demonstrated for one polarization state. The MD and ME are more than one order larger than those of other graphene-waveguide hybrid all-optical modulators. By further optimizing the transferring and cleaning process, the modulator can quickly switch between transparent and opaque states for both the two polarization states with a maximized MD of tens of decibels. This modulator is compatible with current fiber-optic communication systems and may be applied in the near future to meet the impending need for ultrafast optical signal processing.

Xu, Fei; Zheng, Bi-cai; Shao, Guang-hao; Ge, Shi-jun; Lu, Yan-qing

2015-01-01T23:59:59.000Z

335

High-Temperature Structural Ceramics  

Science Journals Connector (OSTI)

...application of ceramic hardware in gas turbine hot-flow-path components to...could survive the rigors ofthe gas turbine envi-ronment in any meaningful...ceramic components could survive in a gas turbine environment, other pro-grams...

R. Nathan Katz

1980-05-23T23:59:59.000Z

336

High-Temperature Structural Ceramics  

Science Journals Connector (OSTI)

...been made in the diesel engine area as well. Perhaps...advanced concept in diesel tech-nology is the...adiabatic turbo-compounded diesel. This engine would eliminate the...an engine can reduce fuel consumption by as much as 25 percent...

R. Nathan Katz

1980-05-23T23:59:59.000Z

337

High temperature turbine engine structure  

DOE Patents [OSTI]

A hybrid ceramic/metallic fastener (bolt) includes a headed ceramic shank carrying a metallic end termination fitting. A conventional cap screw threadably engages the termination fitting to apply tensile force to the fastener.

Boyd, Gary L. (Tempe, AZ)

1991-01-01T23:59:59.000Z

338

High temperature turbine engine structure  

DOE Patents [OSTI]

A hybrid ceramic/metallic fastener (bolt) includes a headed ceramic shank carrying a metallic end termination fitting. A conventional cap screw threadably engages the termination fitting to apply tensile force to the fastener.

Boyd, Gary L. (Tempe, AZ)

1992-01-01T23:59:59.000Z

339

Role of Pyridine as a Biomimetic Organo-Hydride for Homogeneous Reduction of CO2 to Methanol  

E-Print Network [OSTI]

We use quantum chemical calculations to elucidate a viable homogeneous mechanism for pyridine-catalyzed reduction of CO2 to methanol. In the first component of the catalytic cycle, pyridine (Py) undergoes a H+ transfer (PT) to form pyridinium (PyH+) followed by an e- transfer (ET) to produce pyridinium radical (PyH0). Examples of systems to effect this ET to populate the LUMO of PyH+(E0calc ~ -1.3V vs. SCE) to form the solution phase PyH0 via highly reducing electrons include the photo-electrochemical p-GaP system (ECBM ~ -1.5V vs. SCE at pH= 5) and the photochemical [Ru(phen)3]2+/ascorbate system. We predict that PyH0 undergoes further PT-ET steps to form the key closed-shell, dearomatized 1,2-dihydropyridine (PyH2) species. Our proposed sequential PT-ET-PT-ET mechanism transforming Py into PyH2 is consistent with the mechanism described in the formation of related dihydropyridines. Because it is driven by its proclivity to regain aromaticity, PyH2 is a potent recyclable organo-hydride donor that mimics the ...

Lim, Chern-Hooi; Hynes, James T; Musgrave, Charles B

2014-01-01T23:59:59.000Z

340

Conceptual structure and computational organization of the 2008 performance assessment for the proposed high-level radioactive waste repository at Yucca Mountain, Nevada  

Science Journals Connector (OSTI)

Abstract Extensive work has been carried out by the U.S. Department of Energy (DOE) in the development of a proposed geologic repository at Yucca Mountain (YM), Nevada, for the disposal of high-level radioactive waste. This presentation describes the overall conceptual structure and computational organization of the 2008 performance assessment (PA) for the proposed YM repository carried out by the DOE in support of a licensing application to the U.S. Nuclear Regulatory Commission (NRC). The following topics are addressed: (i) regulatory background, (ii) the three basic entities underlying a PA, (iii) determination of expected, mean and median dose to the reasonably maximally exposed individual (RMEI) specified in the NRC regulations for the YM repository, (iv) the relationship between probability, sets and scenario classes, (v) scenario classes and the characterization of aleatory uncertainty, (vi) scenario classes and the determination of expected dose to the RMEI, (vii) analysis decomposition, (viii) disjoint and nondisjoint scenario classes, (ix) scenario classes and the NRCs YM review plan, (x) characterization of epistemic uncertainty, and (xi) adequacy of Latin hypercube sample size used in the propagation of epistemic uncertainty. This article is part of a special issue of Reliability Engineering and System Safety devoted to the 2008 YM PA and is intended as an introduction to following articles in the issue that provide additional analysis details and specific analysis results.

J.C. Helton; C.W. Hansen; C.J. Sallaberry

2014-01-01T23:59:59.000Z

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341

A Laboratory-based Hard X-ray Monochromator for High-Resolution X-ray Emission Spectroscopy and X-ray Absorption Near Edge Structure Measurements  

E-Print Network [OSTI]

We report the development of a laboratory-based Rowland-circle monochromator that incorporates a low poer x-ray (bremsstrahlung) tube source, a spherically-bent crystal analyzer (SBCA), and an energy-resolving solid-state detector. This relatively inexpensive, introductory level instrument achieves 1-eV energy resolution for photon energies of 5 keV to 10 keV while also dmeonstrating a net efficiency previously seen only in laboratory monochromators having much coarser energy resolution. Despite the use of only a compact, air-cooled 10 W x-ray tube, we find count rates for nonresonant x-ray emission spectroscopy (XES) comparable to those achived at monochromatized spectroscopy beamlines at synchrotron light sources. For x-ray absorption near edge structure (XANES), the monochromatized flux is small (due to the use of a low-powered x-ray generator) but still useful for routine transmission-mode studies of concentrated samples. These results indicate that upgrading to a standard commercial high-powered line-foc...

Seidler, G T; Remesnik, A J; Pacold, J I; Ball, N A; Barry, N; Styczinski, M; Hoidn, O R

2014-01-01T23:59:59.000Z

342

STRUCTURE AND HIGH-FIELD PERFORMANCE OF JELLY ROLL PROCESSED Nb{sub 3}Sn WIRES USING Sn-Ta AND Sn-Ti BASED ALLOY SHEET  

SciTech Connect (OSTI)

Sn-Ta based alloy buttons of different compositions were prepared by the melt diffusion process among constituent metal powders, and then pressed into plates. Meanwhile Sn-Ti based alloy plates were sliced from the melt and cast ingot. Resulting Sn-based alloy plates were rolled into thin sheets. The Sn-based alloy sheet was laminated with a Nb sheet, and wound into a Jelly Roll (JR) composite. The composite was encased in a sheath, and fabricated into a thin wire followed by the heat treatment. The application of hydrostatic extrusion is useful at the initial stage of the fabrication. The JR wires using Sn-Ta and Sn-Ti based alloy sheets show a non-Cu J{sub c} of {approx}250 A/mm{sup 2} and {approx}150 A/mm{sup 2} at 20 T and 22 T, respectively, at 4.2 K. It has been found that the Nb impregnates into the Sn-based alloy layers during the reaction, and Nb{sub 3}Sn layers are synthesized by the mutual diffusion between the Nb sheet and the Sn-based alloy sheet without formation of voids. Sn-Ti based alloy sheets are attractive due to their easiness of mass production. Structure and high-field performance of JR processed Nb{sub 3}Sn wires prepared from Sn-based alloy sheets with different compositions are compared in this article.

Tachikawa, K.; Tsuyuki, T.; Hayashi, Y.; Nakata, K. [Faculty of Engineering, Tokai University Hiratsuka, Kanagawa 259-1292 (Japan); Takeuchi, T. [National Institute for Materials Science Tsukuba, Ibaraki 305-0047 (Japan)

2008-03-03T23:59:59.000Z

343

Biomimetics: its practice and theory  

Science Journals Connector (OSTI)

...led to the production of Lotusan, a paint for self-cleaning surfaces (Barthlott...the final product-in this instance, a paint containing particles-seldom resembles...and B Webb2001New neural circuits for robot phonotaxis. Phil. Trans. R. Soc. A...

2006-01-01T23:59:59.000Z

344

Biomimetic vibrissal sensing for robots  

Science Journals Connector (OSTI)

...neuron.2008.05.013 ) 36 Grant, R. A. , Mitchinson, B...Mitchinson, B. , Martin, C. J., Grant, R. A., Prescott, T. J...Germany: Festo Didactic GmbH. 46 Grant, R. A. , Mitchinson, B...supplement sensory systems such as computer vision and, therefore, improve...

2011-01-01T23:59:59.000Z

345

Neutron reflecting supermirror structure  

DOE Patents [OSTI]

An improved neutron reflecting supermirror structure comprising a plurality of stacked sets of bilayers of neutron reflecting materials. The improved neutron reflecting supermirror structure is adapted to provide extremely good performance at high incidence angles, i.e. up to four time the critical angle of standard neutron mirror structures. The reflection of neutrons striking the supermirror structure at a high critical angle provides enhanced neutron throughput, and hence more efficient and economical use of neutron sources. 2 figs.

Wood, J.L.

1992-12-01T23:59:59.000Z

346

Neutron reflecting supermirror structure  

DOE Patents [OSTI]

An improved neutron reflecting supermirror structure comprising a plurality of stacked sets of bilayers of neutron reflecting materials. The improved neutron reflecting supermirror structure is adapted to provide extremely good performance at high incidence angles, i.e. up to four time the critical angle of standard neutron mirror structures. The reflection of neutrons striking the supermirror structure at a high critical angle provides enhanced neutron throughput, and hence more efficient and economical use of neutron sources.

Wood, James L. (Drayton Plains, MI)

1992-01-01T23:59:59.000Z

347

Facile synthesized nanorod structured vanadium pentoxide for...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

synthesized nanorod structured vanadium pentoxide for high-rate lithium batteries. Facile synthesized nanorod structured vanadium pentoxide for high-rate lithium batteries....

348

Structure, Mobility, and Composition of Transition Metal Catalyst Surfaces: High-Pressure Scanning Tunneling Microscopy and Ambient-Pressure X-ray Photoelectron Spectroscopy Studies  

E-Print Network [OSTI]

bimetallic nanoparticle catalysts is studied in Chapter 8.and Pt-based bimetallic nanoparticle catalysts, in order toseek the influence of catalyst surface structure on

Zhu, Zhongwei

2014-01-01T23:59:59.000Z

349

The structures of CO, NO and benzene on various transition metal surfaces: Overview of LEED (low-energy electron diffraction) and HREELS (high-resolution electron energy loss) results  

SciTech Connect (OSTI)

Recent results are summarized concerning the adsorption structures of carbon monoxide (CO) and nitric oxide (NO) chemisorbed on various transition metal surfaces, and of benzene (C6H6) on Pd, Rh and Pt(111). These results were for the most part obtained with intensity analysis of low-energy electron diffraction (LEED) and high-resolution electron energy loss spectroscopy (HREELS).

Ohtani, H.; Van Hove, M.A.; Somorjai, G.A.

1987-06-01T23:59:59.000Z

350

Probing Structure-Property Relationship of Energy Storage Materials Using Ex-Situ, In-Situ Dynamic Microscopy and Spectroscopy with High Spatial and Fast Temporal Resolution  

E-Print Network [OSTI]

Probing Structure-Property Relationship of Energy Storage Materials Using Ex-Situ, In-Situ Dynamic, chemistry, and properties of energy storage materials Find general guiding principle for accelerated-situ chemical imaging and spectroscopic study of structure and chemical evolution of new energy storage

351

High Throughput Combinatorial Screening of Biometic Metal-Organic Materials for Military Hydrogen-Storage Materials (New Joint Miami U/NREL DoD/DLA Project) (presentation)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Miami University/NREL DoD/DLA Project Miami University/NREL DoD/DLA Project High throughput combinatorial screening of biomimetic metal-organic materials for military hydrogen-storage applications Philip Parilla - NREL Joe Zhou, Dan Zhao - Miami U, Ohio Jeff Blackburn, Kevin O'Neill, Lin Simpson, Mike Heben - NREL Outline * Miami/NREL Project - Synthesis (Miami) - High Throughput Characterization (NREL) - Other Characterization * Other High Throughput Activities (NREL) - Parallel Sieverts - Parallel Gravimetric * Final Comments Overview of Miami/NREL Project * Goals - Development of H 2 storage materials based on MOFs, targeting 15 kJ/mole binding energy and high density of H 2 sites - Development of optical-based detection of adsorbed H 2 allowing rapid screening of samples * Approach - Combinatorial MOFs synthesis involving 8

352

A microsecond time resolved x-ray absorption near edge structure synchrotron study of phase transitions in Fe undergoing ramp heating at high pressure  

SciTech Connect (OSTI)

We report a microsecond time-resolved x-ray absorption near edge structure study using synchrotron radiation to dynamically detect structural phase transitions in Fe undergoing rapid heating along a quasi-isochoric path. Within a few ms, we observed two structural phase transitions, which transform the ambient bcc phase of Fe into the fcc phase, and then into the liquid phase. This example illustrates the opportunities offered by energy dispersive x-ray absorption spectroscopy in the study of matter under extreme dynamic conditions. Advanced simulations are compared to these data.

Marini, C.; Mathon, O.; Pascarelli, S. [European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP220, 38043 Grenoble Cedex (France); Occelli, F.; Torchio, R.; Recoules, V.; Loubeyre, P. [CEA, Bruyeres le Chatel, 91297 Arpajon Cedex (France)

2014-03-07T23:59:59.000Z

353

Pressure Effect on the Structural Transition and Suppression of the High-Spin State in the Triple-Layer T;#8242;-La[subscript 4]Ni[subscript 3]O[subscript 8  

SciTech Connect (OSTI)

We report a comprehensive high-pressure study on the triple-layer T{prime}-La{sub 4}Ni{sub 3}O{sub 8} with a suite of experimental probes, including structure determination, magnetic, and transport properties up to 50 GPa. Consistent with a recent ab inito calculation, application of hydrostatic pressure suppresses an insulator-metal spin-state transition at P{sub c} {approx} 6 GPa. However, a low-spin metallic phase does not emerge after the high-spin state is suppressed to the lowest temperature. For P > 20 GPa, the ambient T{prime} structure transforms gradually to a T-type structure, which involves a structural reconstruction from fluorite La-O{sub 2}-La blocks under low pressures to rock-salt LaO-LaO blocks under high pressures. Absence of the metallic phase under pressure has been discussed in terms of local displacements of O{sup 2-} ions in the fluorite block under pressure before a global T phase is established.

Cheng, J.-G.; Zhou, J.-S.; Goodenough, J.B.; Zhou, H.D.; Matsubayashi, K.; Uwatoko, Y.; Kong, P.P.; Jin, C.Q.; Yang, W.G.; Shen, G.Y. (U of Tokyo); (CIW); (FSU); (Chinese Aca. Sci.); (Texas)

2012-07-25T23:59:59.000Z

354

Luminescent Study of Recombination Processes in the Single-Crystal Silicon and Silicon Structures Fabricated Using High-Efficiency Solar Cell Technology  

Science Journals Connector (OSTI)

Some results of the authors researches in the last decade of the luminescence in the region of the fundamental absorption edge (edge luminescence) of the single-crystal silicon (c-Si), including structures which...

A. M. Emelyanov

2014-01-01T23:59:59.000Z

355

The Origin of Differences in the Physical Properties of the Equilibrium Forms of Cytochrome b5 Revealed through High-Resolution NMR Structures and Backbone Dynamic Analyses,  

Science Journals Connector (OSTI)

Complete REDAC runs were carried out for both the A and the B conformations generating 150 structures during each run. ... The REDAC runs were performed iteratively until the target functions converged to a minimum value (36). ...

Bindi Dangi; Siddhartha Sarma; Chunhua Yan; Debra L. Banville; R. D. Guiles

1998-05-22T23:59:59.000Z

356

High-resolution structures of Thermus thermophilus enoyl-acyl carrier protein reductase in the apo form, in complex with NAD+ and in complex with NAD+ and triclosan  

Science Journals Connector (OSTI)

T. thermophilus enoyl-acyl carrier protein reductase was crystallized in the apo form, with NAD+ bound and with NAD+ and the inhibitor triclosan bound. The structures were solved by molecular replacement and refined at 1.50, 1.86 and 1.90 ? resolution, respectively. The structures are described, analysed and compared with those of enoyl-acyl carrier protein reductases from other species.

Otero, J.M.

2012-09-22T23:59:59.000Z

357

Structural consequences of hen egg-white lysozyme orthorhombic crystal growth in a high magnetic field: validation of X-ray diffraction intensity, conformational energy searching and quantitative analysis of B factors and mosaicity  

Science Journals Connector (OSTI)

It has been shown that a high magnetic field of 10 T improves the quality of lysozyme crystals as quantified by comparison of the X-ray diffraction of crystals grown in the presence and absence of a magnetic field of 10 T, from structure comparisons and from molecular-modelling studies with conformational energy searching, from analysis of the anisotropic B factors and finally from analysis of the mosaicity. It is concluded that magnetic enhancement in protein crystal perfection is an important material engineering tool in the study of protein structure and function.

Saijo, S.

2005-02-24T23:59:59.000Z

358

Cryoelectron Microscopy as a Functional Instrument for Systems Biology, Structural Analysis & Experimental Manipulations with Living Cells. A comprehensive review of the current works  

E-Print Network [OSTI]

The aim of this paper is to give an introductory review of the cryoelectron microscopy as a complex data source for the most of the system biology branches, including the most perspective non-local approaches known as "localomics" and "dynamomics". A brief summary of various cryoelectron mi-croscopy methods and corresponding system biological ap-proaches is given in the text. The above classification can be considered as a useful framework for the primary comprehen-sions about cryoelectron microscopy aims and instrumental tools. We do not discuss any of these concepts in details, but merely point out that their methodological complexity follows only from the structure-functional complexity of biological systems which are investigated in this manner. We also postu-late that one can employ some of the cryoelectron microscopic techniques not only for observation, but also for modification and structural refunctionalization of some biological and similar soft matter objects and microscopic samples. In other worlds, we start with the cryoelectron microscopy as a tool for the sys-tem biology and progress to its applying as an instrument for system biology and functional biomimetics; i.e. "system cryobi-ology" goes over into "synthetic cryobiology" or "cryogenic biomimetics". All these conclusions can be deduced from the most recent works of the latest years, including just submitted foreign papers. This article provides an up-to-date description of the conceptual basis for the novel view on the computational cryoelectron microscopy (in silico) approaches and the data mining principles which lie at the very foundation of modern structural analysis and reconstruction.

Oleg V. Gradov; Margaret A. Gradova

2015-01-18T23:59:59.000Z

359

Three-Dimensional Structure of the Reduced C77S Mutant of the Chromatium vinosum High-Potential Iron?Sulfur Protein through Nuclear Magnetic Resonance:? Comparison with the Solution Structure of the Wild-Type Protein,  

Science Journals Connector (OSTI)

As in the latter case, the standard distance geometry (DG) calculations were supplemented by extensive use of the redundant dihedral angle strategy (REDAC) (Gntert & Wthrich, 1991) for the definition of starting conformations. ... More than 2000 random DIANA structures have been computed and a total of 24 REDAC cycles were carried out to generate redundant angle constraints (Gntert & Wthrich, 1991). ...

Detlef Bentrop; Ivano Bertini; Francesco Capozzi; Alexander Dikiy; Lindsay Eltis; Claudio Luchinat

1996-05-07T23:59:59.000Z

360

High-Resolution Solution Structure of Human Intestinal Trefoil Factor and Functional Insights from Detailed Structural Comparisons with the Other Members of the Trefoil Family of Mammalian Cell Motility Factors,  

Science Journals Connector (OSTI)

To maximize the number of converged structures obtained from an initial set of 100 random starting coordinates, each stage of the calculations included five cycles of the redundant dihedral angle (REDAC) procedure. ... It also represents a significant advance over the variable target function method in torsion angle space with the REDAC strategy used by the predecessor program DIANA. ...

Xavier Lemercinier; Frederick W. Muskett; Bruce Cheeseman; Pauline B. McIntosh; Lars Thim; Mark D. Carr

2001-07-14T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

PHYSICAL REVIEW B 84, 064424 (2011) Phonon density of states of Fe2O3 across high-pressure structural and electronic transitions  

E-Print Network [OSTI]

Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA 4 McClellan Nuclear Research of Washington, Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA (Received 16 structural and electronic transitions has been investigated by nuclear resonant inelastic x-ray scattering

Lin, Jung-Fu "Afu"

362

High-resolution structures of mutants of residues that affect access to the ligand-binding cavity of human lipocalin-type prostaglandin D synthase  

Science Journals Connector (OSTI)

Lipocalin-type prostaglandin D synthase (L-PGDS) is the first member of the important lipocalin family to be recognized as an enzyme. The X-ray structures of nine crystal forms of one single mutant, three double mutants and a triple mutant of human L-PGDS have been solved.

Perduca, M.

2014-07-25T23:59:59.000Z

363

Maintenance building structural design description: 4 x 350 MW(t) Modular HTGR [High-Temperature Gas-Cooled Reactor] Plant  

SciTech Connect (OSTI)

The Maintenance Building is a grade-founded, two-story, steel-framed structure, located adjacent to the Turbine Building in the Energy Conversion Area. It has a reinforced concrete foundation and slab on grade, and insulated sheet metal exterior walls and roof decking.

NONE

1986-06-01T23:59:59.000Z

364

High-Pressure Synthesis and Structure Determination of K6(SeO4)(SeO5), The First Potassium Orthoselenate(VI)  

SciTech Connect (OSTI)

The authors report on the first synthesis of a potassium orthoselenate(VI), K{sub 6}(SeO{sub 4})(SeO{sub 5}), and the structure determination from synchrotron powder diffraction data. The title compound crystallizes in the tetragonal space group P4{sub 1}2{sub 1}2 with a = 8.1259(1) {angstrom}, c = 17.4953(2) {angstrom}, V = 1155.21(2) {angstrom}{sup 3}, and Z = 4. Selenium displays two different complex anions, tetrahedral SeO{sub 4}{sup 2-} and trigonal-bipyramidal SeO{sub 5}{sup 4-}. When the formula is reduced to A{sub 3}B, the spatial arrangement of the constituting building units can be derived from the Li{sub 3}Bi type of structure.

Orosel,D.; Dinnebeier, R.; Jansen, M.

2006-01-01T23:59:59.000Z

365

High detection efficiency micro-structured solid-state neutron detector with extremely low leakage current fabricated with continuous p-n junction  

SciTech Connect (OSTI)

We report the continuous p-n junction formation in honeycomb structured Si diode by in situ boron deposition and diffusion process using low pressure chemical vapor deposition for solid-state thermal neutron detection applications. Optimized diffusion temperature of 800 Degree-Sign C was obtained by current density-voltage characteristics for fabricated p{sup +}-n diodes. A very low leakage current density of {approx}2 Multiplication-Sign 10{sup -8} A/cm{sup 2} at -1 V was measured for enriched boron filled honeycomb structured neutron detector with a continuous p{sup +}-n junction. The neutron detection efficiency for a Maxwellian spectrum incident on the face of the detector was measured under zero bias voltage to be {approx}26%. These results are very encouraging for fabrication of large area solid-state neutron detector that could be a viable alternative to {sup 3}He tube based technology.

Huang, Kuan-Chih; Lu, James J.-Q.; Bhat, Ishwara B. [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)] [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Dahal, Rajendra [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States) [Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States); Danon, Yaron [Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)] [Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3522 (United States)

2013-04-15T23:59:59.000Z

366

Neutron reflecting supermirror structure  

DOE Patents [OSTI]

An improved neutron reflecting supermirror structure comprising a plurality of stacked sets of bilayers of neutron reflecting materials. The improved neutron reflecting supermirror structure is adapted to provide extremely good performance at high incidence angles, i.e. up to four time the critical angle of standard neutron mirror structures. The reflection of neutrons striking the supermirror structure at a high critical angle provides enhanced neutron throughput, and hence more efficient and economical use of neutron sources. One layer of each set of bilayers consist of titanium, and the second layer of each set of bilayers consist of an alloy of nickel with carbon interstitially present in the nickel alloy.

Wood, James L. (Drayton Plains, MI)

1992-01-01T23:59:59.000Z

367

High-pressure single-crystal X-ray diffraction facilities on station 9.8 at the SRS Daresbury Laboratory - hydrogen location in the high-pressure structure of ethanol  

Science Journals Connector (OSTI)

A new high-pressure single-crystal diffraction facility constructed on station 9.8 at the Synchrotron Radiation Source, Daresbury Laboratory, is described. Initial results on the low-melting-point compound ethanol are presented; diffraction data were of sufficient quality to enable H-atoms to be located.

Allan, D.R.

2001-01-01T23:59:59.000Z

368

The EF-hand motif is the most common calcium-binding motif found in proteins. Several high-resolution structures  

E-Print Network [OSTI]

. This sequence forms a loop that can accommodate calcium or magnesium with distinct geometries: magnesium is usu637 The EF-hand motif is the most common calcium-binding motif found in proteins. Several high matter © 2000 Elsevier Science Ltd. All rights reserved. Introduction Calcium is among life's most

Yue, David

369

INSTITUTE OF PHYSICS PUBLISHING BIOINSPIRATION & BIOMIMETICS Bioinsp. Biomim. 1 (2006) S42S48 doi:10.1088/1748-3182/1/4/S06  

E-Print Network [OSTI]

structure in cetaceans, which produce hydrodynamic thrust as the caudal vertebrae are oscillated dorso locomotor behavior in which the caudal flukes act as a hydrofoil to generate thrust. The oscillatory the angle of attack of the oscillating flukes (Long et al 1997, Fish 1998a, 1998b). Angle of attack

Fish, Frank

370

High efficiency incandescent lighting  

DOE Patents [OSTI]

Incandescent lighting structure. The structure includes a thermal emitter that can, but does not have to, include a first photonic crystal on its surface to tailor thermal emission coupled to, in a high-view-factor geometry, a second photonic filter selected to reflect infrared radiation back to the emitter while passing visible light. This structure is highly efficient as compared to standard incandescent light bulbs.

Bermel, Peter; Ilic, Ognjen; Chan, Walker R.; Musabeyoglu, Ahmet; Cukierman, Aviv Ruben; Harradon, Michael Robert; Celanovic, Ivan; Soljacic, Marin

2014-09-02T23:59:59.000Z

371

Magnetic and structural transitions in the iron-chalcogenide high-Tc superconductor: K0.8Fe1.76Se2.00  

SciTech Connect (OSTI)

Fe-57 Mossbauer spectroscopy was used to study single-crystals of K0.8Fe1.76Se2.00 from 6K to 673 K. At 6K, the hyperfine field (B-hf) is canted away from the c-axis by 18 +/- 3 degrees. The temperature dependence of B-hf follows a spin wave model with a spin excitation gap of 9 +/- 1 meV. A sudden increase in the linewidth and a corresponding drop in (1/2)eQV(zz) at T-N - 532K are indications of strong coupling between the magnetic and structural transitions. (C) 2012 American Institute of Physics.

Rowan-Weetaluktuk, W.N.; Ryan, D.H.; Cadogan, J.M.; Hu, R.; Budko, S.L.; Canfield, P.C.

2012-02-29T23:59:59.000Z

372

Work Breakdown Structure and Plant/Equipment Designation System Numbering Scheme for the High Temperature Gas- Cooled Reactor (HTGR) Component Test Capability (CTC)  

SciTech Connect (OSTI)

This white paper investigates the potential integration of the CTC work breakdown structure numbering scheme with a plant/equipment numbering system (PNS), or alternatively referred to in industry as a reference designation system (RDS). Ideally, the goal of such integration would be a single, common referencing system for the life cycle of the CTC that supports all the various processes (e.g., information, execution, and control) that necessitate plant and equipment numbers be assigned. This white paper focuses on discovering the full scope of Idaho National Laboratory (INL) processes to which this goal might be applied as well as the factors likely to affect decisions about implementation. Later, a procedure for assigning these numbers will be developed using this white paper as a starting point and that reflects the resolved scope and outcome of associated decisions.

Jeffrey D Bryan

2009-09-01T23:59:59.000Z

373

Calcium silicate insulation structure  

DOE Patents [OSTI]

An insulative structure including a powder-filled evacuated casing utilizes a quantity of finely divided synthetic calcium silicate having a relatively high surface area. The resultant structure-provides superior thermal insulating characteristics over a broad temperature range and is particularly well-suited as a panel for a refrigerator or freezer or the insulative barrier for a cooler or a insulated bottle.

Kollie, Thomas G. (Oak Ridge, TN); Lauf, Robert J. (Oak Ridge, TN)

1995-01-01T23:59:59.000Z

374

High Performance Computing School COMSC  

E-Print Network [OSTI]

High Performance Computing School COMSC This module aims to provide the students with fundamental knowledge and understanding of techniques associated with High Performance Computing and its practical' skills in analysing and evaluating High Performance Computing and will be structured around

Martin, Ralph R.

375

The Spitzer Survey of Stellar Structure in Galaxies (S4G). The Pipeline 5: High-precision stellar masses at 3.6 micron  

E-Print Network [OSTI]

The mid-infrared is an optimal window to trace stellar mass in nearby galaxies and the 3.6 micron IRAC band has been exploited to this effect, but such mass estimates can be biased by dust emission. We present our pipeline to reveal the old stellar flux at 3.6 micron and obtain stellar mass maps for more than 1600 galaxies available from the Spitzer Survey of Stellar Structure in Galaxies (S4G). This survey consists of images in two infrared bands (3.6 and 4.5 micron), and we use the Independent Component Analysis (ICA) method presented in Meidt et al. (2012) to separate the dominant light from old stars and the dust emission that can significantly contribute to the observed 3.6 micron flux. We exclude from our ICA analysis galaxies with low signal-to-noise (S/N < 10) and those with original [3.6]-[4.5] colors compatible with an old stellar population, indicative of little dust emission (mostly early Hubble types, which can directly provide good mass maps). For the remaining 1251 galaxies to which ICA was ...

Querejeta, M; Schinnerer, E; Cisternas, M; Muoz-Mateos, J C; Sheth, K; Knapen, J; van de Ven, G; Norris, M A; Peletier, R; Laurikainen, E; Salo, H; Holwerda, B W; Athanassoula, E; Bosma, A; Groves, B; Ho, L C; Gadotti, D A; Zaritsky, D; Regan, M; Hinz, J; de Paz, A Gil; Menendez-Delmestre, K; Seibert, M; Mizusawa, T; Kim, T; Erroz-Ferrer, S; Laine, J; Comern, S

2014-01-01T23:59:59.000Z

376

Element-specific structure of materials with intrinsic disorder by high-energy resonant x-ray diffraction and differential atomic pair-distribution functions: A study of PtPd nanosized catalysts  

Science Journals Connector (OSTI)

We demonstrate how high-energy resonant x-ray diffraction (XRD) and differential atomic-pair-distribution function (PDF) analysis can be used to characterize the atomic ordering in materials of limited structural coherence with both excellent spatial resolution and element specificity. First we prove that this experimental approach is feasible by probing the K-absorption edge of Au(?81?keV) atoms in chemically ordered and disordered bulk Cu3Au alloys. The resulting Au-differential PDFs show very clearly the different ways Au atoms are known to occupy the sites of otherwise identical cubic lattices of those materials. Next we apply it to a more complex material: PtPd alloy and core-shell nanosized (?24?nm) particles by probing the K-absorption edge of Pt(?78?keV). The resulting Pt-differential atomic PDFs reveal how exactly the atomic ordering of catalytically active Pt atoms is affected by the nanoparticles design, thus providing a firm structural basis for understanding their properties. The work is a step forward in expanding the limits of applicability of nontraditional XRD to the rapidly growing field of materials of unusual structural complexity.

V. Petkov and S. D. Shastri

2010-04-21T23:59:59.000Z

377

High-Temperature Membrane with Humidification-Independent Cluster Structure - DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

6 6 DOE Hydrogen and Fuel Cells Program FY 2012 Annual Progress Report Ludwig Lipp (Primary Contact), Pinakin Patel, Ray Kopp FuelCell Energy (FCE), Inc. 3 Great Pasture Road Danbury, CT 06813 Phone: (203) 205-2492 Email: llipp@fce.com DOE Managers HQ: Donna Ho Phone: (202) 586-8000 Email: Donna.Ho@ee.doe.gov GO: Greg Kleen Phone: (720) 356-1672 Email: Gregory.Kleen@go.doe.gov Technical Advisor Thomas Benjamin Phone: (630) 252-1632 Email: benjamin@anl.gov Contract Number: 36-06GO16033 Start Date: June 1, 2006 Projected End Date: August 31, 2012 Fiscal Year (FY) 2012 Objectives Develop humidity-independent, thermally stable, low * equivalent weight composite membranes with controlled ion-cluster morphology, to provide high proton- conductivity at up to 120 o C (overall goal: meet DOE

378

Synthesis, Crystal Structure, and High Temperature Transport Properties of p-type Cu2Zn1-xFexSnSe4  

SciTech Connect (OSTI)

Iron substituted Cu2Zn1-xFexSnSe4 stannites were synthesized by reaction of the constituent elements and subsequent solid state annealing, followed by densification by hot-pressing. The compositions for each specimen were confirmed with a combination of Rietveld refinement and elemental analysis. Refinement results indicated that only the 2a site was occupied by Zn and Fe. Their high temperature transport properties were measured from 300 to 800 K. The electrical resistivity and thermal conductivity decrease with increasing Fe content. For the lower Fe content specimens with x = 0.2 and 0.4, the electrical properties are strongly temperature dependent, unlike that of the higher Fe content specimens (x = 0.6 and 0.8). A maximum ZT value of 0.46 was obtained at 800 K for Cu2Zn0.4Fe0.6SnSe4.

Dong, Yongkwan [University of South Florida, Tampa (USF)] [University of South Florida, Tampa (USF); Wang, Hsin [ORNL] [ORNL; Nolas, George S. [University of South Florida] [University of South Florida

2013-01-01T23:59:59.000Z

379

Development of improved processing and evaluation methods for high reliability structural ceramics for advanced heat engine applications, Phase 1. Final report  

SciTech Connect (OSTI)

The program goals were to develop and demonstrate significant improvements in processing methods, process controls and non-destructive evaluation (NDE) which can be commercially implemented to produce high reliability silicon nitride components for advanced heat engine applications at temperatures to 1,370{degrees}C. The program focused on a Si{sub 3}N{sub 4}-4% Y{sub 2}O{sub 3} high temperature ceramic composition and hot-isostatic-pressing as the method of densification. Stage I had as major objectives: (1) comparing injection molding and colloidal consolidation process routes, and selecting one route for subsequent optimization, (2) comparing the performance of water milled and alcohol milled powder and selecting one on the basis of performance data, and (3) adapting several NDE methods to the needs of ceramic processing. The NDE methods considered were microfocus X-ray radiography, computed tomography, ultrasonics, NMR imaging, NMR spectroscopy, fluorescent liquid dye penetrant and X-ray diffraction residual stress analysis. The colloidal consolidation process route was selected and approved as the forming technique for the remainder of the program. The material produced by the final Stage II optimized process has been given the designation NCX 5102 silicon nitride. According to plan, a large number of specimens were produced and tested during Stage III to establish a statistically robust room temperature tensile strength database for this material. Highlights of the Stage III process demonstration and resultant database are included in the main text of the report, along with a synopsis of the NCX-5102 aqueous based colloidal process. The R and D accomplishments for Stage I are discussed in Appendices 1--4, while the tensile strength-fractography database for the Stage III NCX-5102 process demonstration is provided in Appendix 5. 4 refs., 108 figs., 23 tabs.

Pujari, V.K.; Tracey, D.M.; Foley, M.R.; Paille, N.I.; Pelletier, P.J.; Sales, L.C.; Wilkens, C.A.; Yeckley, R.L. [Norton Co., Northboro, MA (United States)

1993-08-01T23:59:59.000Z

380

Nano dispersion amplified waveguide structures  

Science Journals Connector (OSTI)

A highly dispersive waveguide structure is proposed tocefficiently compress and expand ultra short pulses in a package forming a sufficiently small footprint. A sub-wavelength...

Brown, J; Johnson, Eric; Moharam, M

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

A rich bounty of AGN in the 9 square degree Bootes survey: high-z obscured AGN and large-scale structure  

E-Print Network [OSTI]

We use observations from the 9 square degree multiwavelength survey in Bootes to identify hundreds of obscured active galactic nuclei (AGN) with high redshifts (z > 0.7), luminosities (L_bol > 10^45 ergs/s), and moderate obscuring columns (N_H > 10^22 cm^-2), and to measure the clustering properties of X-ray AGN at z > 1. In the Bootes region, shallow (5 ks) Chandra X-ray observations have detected ~4,000 X-ray sources, and the same region has been mapped with deep optical imaging and by Spitzer IRAC, which detects ~300,000 point sources, of which ~30,000 have detections in all four IRAC bands, for which we can select AGN on the basis of their mid-IR colors. With the MMT/Hectospec we have obtained modest resolution optical spectra for about half the X-ray sources (out to z > 3) and ~20,000 galaxies (out to z = 0.7). With this multiwavelength data we select >400 AGN per square degree (compared to 12 per square degree from SDSS). Among a sample of IRAC-selected AGN we identify 641 candidate obscured objects based on their R band and IRAC luminosities. We use X-ray stacking techniques to verify that they are obscured AGN and measure their absorbing column densities. We also measure the three-dimensional two-point correlation function for X-ray selected AGN.

R. C. Hickox; C. Jones; W. R. Forman; S. S. Murray; A. Kenter; M. Brodwin; the Chandra XBootes; NOAO Deep Wide-Field Survey; Spitzer IRAC Shallow Survey; AGES Teams

2006-11-21T23:59:59.000Z

382

Please cite this article in press as: Shojania, S., et al., High yield expression and purification of HIV-1 Tat1-72 for structural studies. J. Virol. Methods (2009), doi:10.1016/j.jviromet.2009.11.021  

E-Print Network [OSTI]

of HIV-1 Tat1-72 for structural studies. J. Virol. Methods (2009), doi:10.1016/j.jviromet.2009.elsevier.com/locate/jviromet High yield expression and purification of HIV-1 Tat1-72 for structural studies Shaheen Shojania in revised form 17 November 2009 Accepted 17 November 2009 Available online xxx Keywords: HIV Tat

O'Neil, Joe

383

ISG8-Structures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structures (WG4) Structures (WG4) Orange Rm H. Carter, T. Higo and J. Wang Parallel Sessions: Working Groups: WG1: Parameters, Design, Instrumentation and Tuning WG2: Damping Rings and ATF WG3: RF Sources WG4:Structures WG5: Ground Motion; Site Requirements and Investigations Goals Review of progress and experiences in design and fabrication. Review of high gradient tests. R&D plan and schedule through spring of 2003. Plan and schedule for production of 8-pack structures. Plan and schedule to document how to manufacture and process NLC/JLC accelerator structures. Preliminary Agenda Monday 9:00 Plenary 10:30 Coffee Break 11:00 – 12:00 Working Group Organization Opening Remarks - Dave Burke, Ron Ruth, Nobu Toge Discussion: Agenda and working group organization Lunch 13:30 – 15:30 High Gradient Test (Joint session with WG3)

384

Molecular organization in the native state of woody tissue: Studies of tertiary structure using the Raman microprobe solid state 13C NMR and biomimetic tertiary aggregates. Progress report, July 1, 1989--June 30, 1993  

SciTech Connect (OSTI)

We have previously shown that all relatively pure plant and bacterial celluloses are, in their native states, composites of two lattice forms, I{sub {alpha}} and I{sub {beta}}, and that the two forms possess molecular chains in the same conformations but with different hydrogen bonding patterns. In the current period we have demonstrated that in higher plant cell wall matrices, the hemicelluloses are likely to have a regulatory function during the aggregation of cellulose. Different hemicelluloses appear to influence the aggregation in different ways. We have also developed preliminary evidence indicating the hemicelluloses may have a protective function against the action of some cellulolytic enzymes. The specific accomplishments during the current period are detailed. Demonstration that hemicelluloses present during biogenesis can transform bacterial cellulose into a cellulose typical of higher plant celluloses, and that each hemicellulose has a different effect on the pattern of aggregation. Evidence is presented that the hemicelluloses may limit the action of certain cellulolytic enzymes, suggesting that their function may go beyond regulation to include passive resistance to cellulolytic pathogens. Enhancing the potential of the Raman microprobe technique for mapping variability of lignin in the cell wall by identifying the contribution of the different substructures of lignin to the intensity of the key band in the Raman spectrum of lignin. Mapping of the variability of lignin across two cell wall sections. The mappings have convoluted within them both composition and concentration, but they demonstrate the potential of the method and point to the improvements we are now making so as to distinguish between variability of concentration and variability of composition.

Atalla, R.H.

1993-12-31T23:59:59.000Z

385

Fracture of aluminum naval structures  

E-Print Network [OSTI]

Structural catastrophic failure of naval vessels due to extreme loads such as underwater or air explosion, high velocity impact (torpedoes), or hydrodynamic loads (high speed vessels) is primarily caused by fracture. ...

Galanis, Konstantinos, 1970-

2007-01-01T23:59:59.000Z

386

Development of High-Capacity Cathode Materials with Integrated...  

Broader source: Energy.gov (indexed) [DOE]

Development of High-Capacity Cathode Materials with Integrated Structures Development of High-Capacity Cathode Materials with Integrated Structures 2013 DOE Hydrogen and Fuel Cells...

387

Development of high-capacity cathode materials with integrated...  

Broader source: Energy.gov (indexed) [DOE]

Development of high-capacity cathode materials with integrated structures Development of high-capacity cathode materials with integrated structures 2009 DOE Hydrogen Program and...

388

High speed door assembly  

SciTech Connect (OSTI)

This invention is comprised of a high speed door assembly, comprising an actuator cylinder and piston rods, a pressure supply cylinder and fittings, an electrically detonated explosive bolt, a honeycomb structured door, a honeycomb structured decelerator, and a structural steel frame encasing the assembly to close over a 3 foot diameter opening within 50 milliseconds of actuation, to contain hazardous materials and vapors within a test fixture.

Shapiro, C.

1991-12-31T23:59:59.000Z

389

High Temperature, High Pressure Devices for Zonal Isolation in...  

Open Energy Info (EERE)

remotely and autonomous deployable structures for space and our high temperature composite technology developed for downhole applications. These devices offer several...

390

National High Magnetic Field Laboratory: DC Field Facility: High...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

phase transitions High-resolution electron spin resonance (ESR) spectroscopy of transition metal ions (which is of great importance in chemistry, biochemistry and structural...

391

Structural stability of Fe[subscript 5]Si[subscript 3] and Ni[subscript 2]Si studied by high-pressure x-ray diffraction and ab initio total-energy calculations  

SciTech Connect (OSTI)

We performed high-pressure angle dispersive x-ray diffraction measurements on Fe{sub 5}Si{sub 3} and Ni{sub 2}Si up to 75 GPa. Both materials were synthesized in bulk quantities via a solid-state reaction. In the pressure range covered by the experiments, no evidence of the occurrence of phase transitions was observed. On top of that, Fe{sub 5}Si{sub 3} was found to compress isotopically, whereas an anisotropic compression was observed in Ni{sub 2}Si. The linear incompressibility of Ni{sub 2}Si along the c axis is similar in magnitude to the linear incompressibility of diamond. This fact is related to the higher valence-electron charge density of Ni{sub 2}Si along the c axis. The observed anisotropic compression of Ni{sub 2}Si is also related to the layered structure of Ni{sub 2}Si, where hexagonal layers of Ni{sup 2+} cations alternate with graphite-like layers formed by (NiSi){sup 2-} entities. The experimental results are supported by ab initio total-energy calculations carried out using density functional theory and the pseudopotential method. For Fe{sub 5}Si{sub 3}, the calculations also predicted a phase transition at 283 GPa from the hexagonal P6{sub 3}/mcm phase to the cubic structure adopted by Fe and Si in the garnet Fe{sub 5}Si{sub 3}O{sub 12}. The room-temperature equations of state for Fe{sub 5}Si{sub 3} and Ni{sub 2}Si are also reported and a possible correlation between the bulk modulus of iron silicides and the coordination number of their minority element is discussed. Finally, we report additional descriptions of these structures, in particular, of the predicted high-pressure phase of Fe{sub 5}Si{sub 3} (the cation subarray in the garnet Fe{sub 5}Si{sub 3}O{sub 12}), which can be derived from spinel Fe{sub 2}SiO{sub 4} (Fe{sub 6}Si{sub 3}O{sub 12}).

Errandonea, D.; Santamaria-Perez, D.; Vegas, A.; Nuss, J.; Jansen, M.; Rodriguez-Hernandez, P.; Munoz, A. (MXPL-M); (Valencia); (IQ-FR); (Laguna); (MXPL-F)

2008-04-02T23:59:59.000Z

392

Visible structures  

E-Print Network [OSTI]

All architecture is the interplay between structure, surface and ornament. Traditionally, ornament adorned structure thereby giving it its meaning. A society with its intellectual foundations resting in faith or the abstract ...

Conway, Helene Marie

1991-01-01T23:59:59.000Z

393

Structural biology  

Science Journals Connector (OSTI)

...systematic attempt to 1980 K. C. Holmes Structural biology...structural genomics (Shapiro & Lima 1998). The purpose...Rosenbaum, G., Holmes, K. C. & Witz, J. 1971 Synchrotron...95, 13 585^13590. Shapiro, L. & Lima, C. D. 1998 The Argonne...

1999-01-01T23:59:59.000Z

394

Colloids with high-definition surface structures  

Science Journals Connector (OSTI)

...conformally deposited on submicrometer features without loss of topological information (37), the lower resolution of the 3D printing process is not limited by the CVD step but is defined by the photopatterning process and, more specifically, by...

Hsien-Yeh Chen; Jean-Marie Rouillard; Erdogan Gulari; Joerg Lahann

2007-01-01T23:59:59.000Z

395

Ceramics: Brittle Materials for High Temperature Structures  

Science Journals Connector (OSTI)

...both debilitating and life-threatening. Investigators...oriented toward ceramic gas turbines 28 MARCH 1975 for vehicles...size that could be in the remaining samples. In a second...in actual or simulated gas turbine environments will be examined...

Arthur L. Robinson

1975-03-28T23:59:59.000Z

396

High Precision Geophysics & Detailed Structural Exploration ...  

Open Energy Info (EERE)

fault zones at the hot springs. Natural state hot water flow patterns in the fracture network will be interpreted from temperature gradient wells and then tested with...

397

Crump Geyser: High Precision Geophysics & Detailed Structural...  

Broader source: Energy.gov (indexed) [DOE]

testing approach to Flowing Differential Self Potential (FDSP) and electrical tomography resistivity as a guide to exploration and development. - Demonstrate utility and...

398

Crump Geyser: High Precision Geophysics & Detailed Structural...  

Broader source: Energy.gov (indexed) [DOE]

testing approach to Flowing Differential Self Potential (FDSP) and electrical tomography resistivity as a guide to exploration and development. Demonstrate utility and...

399

Structural Risk Minimization Kernels Support Vector Machines Support Vector Machines  

E-Print Network [OSTI]

Dimensional Spaces Many acceptable solutions bad generalization Structural Risk Minimization Kernels SupportStructural Risk Minimization Kernels Support Vector Machines Support Vector Machines Kernel Methods Structural Risk Minimization Kernels Support Vector Machines 1 Structural Risk Minimization High Dimensional

Kjellström, Hedvig

400

High-pressure crystallography  

Science Journals Connector (OSTI)

The history and development of high-pressure crystallography are briefly described and examples of structural transformations in compressed compounds are given. The review is focused on the diamond-anvil cell, celebrating its 50th anniversary this year, the principles of its operation and the impact it has had on high-pressure X-ray diffraction.

Katrusiak, A.

2007-12-21T23:59:59.000Z

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Giant light extraction enhancement of medical imaging scintillation materials using biologically inspired integrated nanostructures  

Science Journals Connector (OSTI)

We have utilized biologically inspired (bio-inspired), moth-eye nanostructures and further improved this biomimetic structure to enhance the scintillator materials external quantum...

Pignalosa, P; Liu, Bo; Chen, Hong; Smith, H; Yi, Yasha

2012-01-01T23:59:59.000Z

402

CHARBEL FARHAT Vivian Church Hoff Professor of Aircraft Structures  

E-Print Network [OSTI]

of Aeronautics and Astronautics Director, Army High Performance Computing Research Center Professor, Department-Driven Systems, Finite Element Approximation, Fluid-Structure Interaction, High Performance Computing, Implosion of Aircraft Structures, Stanford University 2007- Director, Army High Performance Computing Research Center

Farhat, Charbel

403

4D printing : towards biomimetic additive manufacturing ; Four dimensional printing : towards biomimetic additive manufacturing ; Towards biomimetic additive manufacturing .  

E-Print Network [OSTI]

??Inherent across all scales in Nature's material systems are multiple design dimensions, the existences of which are products of both evolution and environment. In human (more)

Tsai, Elizabeth Yinling

2013-01-01T23:59:59.000Z

404

Study of cavity type antenna structure of large-area 915 MHz ultra-high frequency wave plasma device based on three-dimensional finite difference time-domain analysis  

SciTech Connect (OSTI)

A large-area planar plasma source with a resonant cavity type launcher driven by a 915 MHz ultra-high frequency wave was developed. Theoretical analysis with the three-dimensional finite difference time-domain simulation was carried out to determine the optimized launcher structure by analyzing the resonant transverse magnetic mode in the resonant cavity. Numerical result expects that the resonant electric field distribution inside the cavity dominantly consists of the TM{sub 410} mode. The resonant cavity type launcher having 8 holes in an octagonal geometry was designed to fit the resonant transverse magnetic mode. Adjusting 8 hole positions of the launcher to the field pattern of the resonant TM{sub 410} mode, we found that the plasma density increased about 40%?50% from 1.0?1.1 10{sup 11} cm{sup ?3} to ?1.5 10{sup 11} cm{sup ?3} at the same incident power of 2.5 kW, compared with the previous results with the launcher having 6 holes in the hexagonal geometry. It is also noted that the electron density changes almost linearly with the incident wave power without any mode jumps.

Chang, Xijiang [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China) [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China); Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Kunii, Kazuki [Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan)] [Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Liang, Rongqing [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China)] [Department of Light Sources and Illuminating Engineering, Fudan University, 220 Handan Road, Shanghai 200433 (China); Nagatsu, Masaaki [Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan) [Graduate School of Science and Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561 (Japan); Graduate School of Engineering, Shizuoka University,3-5-1 Johoku, Hamamatsu 432-8561 (Japan)

2013-11-14T23:59:59.000Z

405

Protein Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Protein Structure Protein Structure Name: Chris Location: N/A Country: N/A Date: N/A Question: what are the four levels or structure of protien Replies: Hi Chris... as you must know proteins are made of amino acids arranged in polypeptide chains, and the order of them in these chains is called primary structure. The regular way in which the polypeptide chains are arranged in space to form a protein molecule is called secondary structure. The arrangement of the three-dimensional structure of the polypeptide chain in space is the tertiary structure. The arrangement of the combination of two or more polypeptide chains constitutes the quartenary structure. Quite simple, isn't? If you just remember that the molecular weights of proteins range usually from 10,000 to 100,000 daltons (one dalton is the weight of one hydrogen atom) and that 20 different amino-acids in a chain 100 amino acids long can be arranged in far more than 10 to its 100 potency ( number 1 followed by 100 zeroes) ways!

406

4D printing : towards biomimetic additive manufacturing  

E-Print Network [OSTI]

Inherent across all scales in Nature's material systems are multiple design dimensions, the existences of which are products of both evolution and environment. In human manufacturing where design must be preconceived and ...

Tsai, Elizabeth Yinling

2013-01-01T23:59:59.000Z

407

Calcifying tissue regeneration via biomimetic materials chemistry  

Science Journals Connector (OSTI)

...National Research Foundation of Korea (NRF) of the Ministry of Education, Science...proteins and genetic programming. Panels (a-d) represent the natural inorganic skeletons...Society; (c) adapted from Wiley-VCH; (d) adapted from Wikipedia, Patrick Siemer...

2014-01-01T23:59:59.000Z

408

Approaches for biological and biomimetic energy conversion  

Science Journals Connector (OSTI)

...fully synthetic and/or hybrid devices is still in its...costs are related to infrastructure, such as supporting...power inverters, and grid connections. For example...6.86/W), with infrastructure comprising 3540...use synthetic and/or hybrid approaches to mimic...

David A. LaVan; Jennifer N. Cha

2006-01-01T23:59:59.000Z

409

Biomimetics: lessons from naturean overview  

Science Journals Connector (OSTI)

...shark skin surface prevents marine organisms from being able to...develop dental implants and wear-resistant and self-sharpening...develop materials for abrasive wear resistance applications. The...surfaces and their relevance to marine fouling: a review. Biofouling...

2009-01-01T23:59:59.000Z

410

Cell Interactions within Biomimetic Apatite Microenvironments  

E-Print Network [OSTI]

92] Z. Meleti, I. . Shapiro, and C. . Adams, InorganicK. H. Szymczyk, I. M. Shapiro, and C. S. Adams, Matrix

Tsang, Eric

2014-01-01T23:59:59.000Z

411

BIOMIMETIC SURVIVAL HYDRODYNAMICS AND FLOW SENSING  

E-Print Network [OSTI]

;May 2014 4 SWIMMING FISH AND FLYING BIRDS Why fish have no propellers? Why birds flap their wings? #12 leaves a pure vortex "Formation of a Vortex Ring by Giving an Impulse to a Circular Disk

Daraio, Chiara

412

Biomimetic Dye Molecules for Solar Cells  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

such as those used in solar cells. This requires close monitoring to obtain reproducible solar cells. The polarization dependence of the spectra reveals the orientation of the...

413

Biomimetics: lessons from naturean overview  

Science Journals Connector (OSTI)

...propel crude oil in the Alaska pipeline (Motier Carrier 1989). The...biological mechanisms of self-repair. At the molecular level...tissue response to injury and repair involves inflammation, wound...drag reduction in commercial pipelines. In Drag reduction in fluid...

2009-01-01T23:59:59.000Z

414

Development of a high-resolution soft x-ray (30--1500 eV) beamline at the Advanced Light Source and its use for the study of angle-resolved photoemission extended fine structure  

SciTech Connect (OSTI)

ALS Bending magnet beamline 9.3.2 is for high resolution spectroscopy, with circularly polarized light. Fixed included-angle SGM uses three gratings for 30--1500 eV photons; circular polarization is produced by an aperture for selecting the beam above or below the horizontal plane. Photocurrent from upper and lower jaws of entrance slit sets a piezoelectric drive feedback loop on the vertically deflecting mirror for stable beam. End station has a movable platform. With photomeission data from Stanford, structure of c(2{times}2)P/Fe(100) was determined using angle-resolved photoemission extended fine structure (ARPEFS). Multiple-scattering spherical-wave (MSSW) calculations indicate that P atoms adsorb in fourfold hollow sites 1.02A above the first Fe layer. Self-consistent-field X{alpha} scattered wave calculation confirm that the Fe{sub 1}-Fe{sub 2} space is contracted for S/Fe but not for P/Fe; comparison is made to atomic N and O on Fe(100). Final-state effects on ARPEFS curves used literature data from the S 1s and 2p core levels of c(2{times}2)S/Ni(001); a generalized Ramsauer-Townsend splitting is present in the 1s but not 2p data. An approximate method for analyzing ARPEFS data from a non-s initial state using only the higher-{ell} partial wave was tested successfully. ARPEFS data from clean surfaces were collected normal to Ni(111) (3p core levels) and 5{degree} off-normal from Cu(111)(3s, 3p). Fourier transforms (FT) resemble adsorbate systems, showing backscattering signals from atoms up to 4 layers below emitters. 3p FTs show scattering from 6 nearest neighbors in the same crystal layer as the emitters. MSSW calulation indicate that Cu 3p photoemission is mostly d-wave. FTs also indicate double-scattering and single-scattering from laterally distant atoms; calculations indicate that the signal is dominated by photoemission from the first 2 crystal layers.

Huff, W.R.A. [California Univ., Berkeley, CA (United States). Dept. of Chemistry]|[Lawrence Berkeley National Lab., CA (United States)

1996-02-01T23:59:59.000Z

415

Characterization of interface states in Al{sub 2}O{sub 3}/AlGaN/GaN structures for improved performance of high-electron-mobility transistors  

SciTech Connect (OSTI)

We have investigated the relationship between improved electrical properties of Al{sub 2}O{sub 3}/AlGaN/GaN metal-oxide-semiconductor high-electron-mobility transistors (MOS-HEMTs) and electronic state densities at the Al{sub 2}O{sub 3}/AlGaN interface evaluated from the same structures as the MOS-HEMTs. To evaluate Al{sub 2}O{sub 3}/AlGaN interface state densities of the MOS-HEMTs, two types of capacitance-voltage (C-V) measurement techniques were employed: the photo-assisted C-V measurement for the near-midgap states and the frequency dependent C-V characteristics for the states near the conduction-band edge. To reduce the interface states, an N{sub 2}O-radical treatment was applied to the AlGaN surface just prior to the deposition of the Al{sub 2}O{sub 3} insulator. As compared to the sample without the treatment, the N{sub 2}O-radical treated Al{sub 2}O{sub 3}/AlGaN/GaN structure showed smaller frequency dispersion of the C-V curves in the positive gate bias range. The state densities at the Al{sub 2}O{sub 3}/AlGaN interface were estimated to be 1??10{sup 12}?cm{sup ?2}?eV{sup ?1} or less around the midgap and 8??10{sup 12}?cm{sup ?2}?eV{sup ?1} near the conduction-band edge. In addition, we observed higher maximum drain current at the positive gate bias and suppressed threshold voltage instability under the negative gate bias stress even at 150?C. Results presented in this paper indicated that the N{sub 2}O-radical treatment is effective both in reducing the interface states and improving the electrical properties of the Al{sub 2}O{sub 3}/AlGaN/GaN MOS-HEMTs.

Hori, Y.; Yatabe, Z. [Research Center for Integrated Quantum Electronics (RCIQE) and Graduate School of Information Science and Technology, Hokkaido University, North 13 West 8, Sapporo, 060-8628 Hokkaido (Japan); Hashizume, T., E-mail: hashi@rciqe.hokudai.ac.jp [Research Center for Integrated Quantum Electronics (RCIQE) and Graduate School of Information Science and Technology, Hokkaido University, North 13 West 8, Sapporo, 060-8628 Hokkaido (Japan); Japan Science and Technology Agency (JST), CREST, Tokyo 102-0075 (Japan)

2013-12-28T23:59:59.000Z

416

Ionization of cytosine monomer and dimer studied by VUV photoionization and electronic structure calculations  

E-Print Network [OSTI]

photoionization and electronic structure calculations. Olegand a number of electronic structure calculations. 9, 15-18and high-level electronic structure calculations. This work

Kostko, Oleg

2010-01-01T23:59:59.000Z

417

Dependence of liquefaction behavior on coal characteristics. Part VI. Relationship of liquefaction behavior of a set of high sulfur coals to chemical structural characteristics. Final technical report, March 1981 to February 1984  

SciTech Connect (OSTI)

The initial aim of this research was to use empirical mathematical relationships to formulate a better understanding of the processes involved in the liquefaction of a set of medium rank high sulfur coals. In all, just over 50 structural parameters and yields of product classes were determined. In order to gain a more complete understanding of the empirical relationships between the various properties, a number of relatively complex statistical procedures and tests were applied to the data, mostly selected from the field of multivariate analysis. These can be broken down into two groups. The first group included grouping techniques such as non-linear mapping, hierarchical and tree clustering, and linear discriminant analyses. These techniques were utilized in determining if more than one statistical population was present in the data set; it was concluded that there was not. The second group of techniques included factor analysis and stepwise multivariate linear regressions. Linear discriminant analyses were able to show that five distinct groups of coals were represented in the data set. However only seven of the properties seemed to follow this trend. The chemical property that appeared to follow the trend most closely was the aromaticity, where a series of five parallel straight lines was observed for a plot of f/sub a/ versus carbon content. The factor patterns for each of the product classes indicated that although each of the individual product classes tended to load on factors defined by specific chemical properties, the yields of the broader product classes, such as total conversion to liquids + gases and conversion to asphaltenes, tended to load largely on factors defined by rank. The variance explained and the communalities tended to be relatively low. Evidently important sources of variance have still to be found.

Neill, P. H.; Given, P. H.

1984-09-01T23:59:59.000Z

418

The structure of trititanate nanotubes  

Science Journals Connector (OSTI)

Combining information from X-ray diffraction, selected-area electron diffraction, high-resolution transmission electron microscopy and image simulation, a structural model is derived for trititanate nanotubes.

Chen, Q.

2002-07-30T23:59:59.000Z

419

High pressure and multiferroics materials: a happy marriage  

Science Journals Connector (OSTI)

The effect of high pressure on the synthesis, properties and atomic structure of multiferroic materials with perovskite or perovskite-related structures is reviewed.

Gilioli, E.

2014-10-31T23:59:59.000Z

420

High-Resolution Crack Imaging Reveals Degradation Processes in...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Crack Imaging Reveals Degradation Processes in Nuclear Reactor Structural Materials. High-Resolution Crack Imaging Reveals Degradation Processes in Nuclear Reactor Structural...

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Structural Risk Minimization Kernels Support Vector Machines Support Vector Machines  

E-Print Network [OSTI]

Dimensional Spaces Many acceptable solutions #12;Structural Risk Minimization Kernels Support Vector Machines High Dimensional Spaces Many acceptable solutions bad generalization #12;Structural Risk MinimizationStructural Risk Minimization Kernels Support Vector Machines Support Vector Machines Kernel Methods

Kjellström, Hedvig

422

Highly oxidized superconductors  

DOE Patents [OSTI]

Novel superconducting materials in the form of compounds, structures or phases are formed by performing otherwise known synthesis in a highly oxidizing atmosphere rather than that created by molecular oxygen at atmospheric pressure or below. This leads to the successful synthesis of novel superconducting compounds which are thermodynamically stable at the conditions under which they are formed. 16 figs.

Morris, D.E.

1994-09-20T23:59:59.000Z

423

Offshore structures  

Science Journals Connector (OSTI)

... SIR,-We have had some experience with modelling offshore structures in the laboratory, and wish to call attention to the need for better ... have already occurred have been serious enough, but the failure of one of the giant rigs or platforms now being planned would be a catastrophe of unprecedented proportions.

CHESLEY J. POSEY; RICHARD SILVESTER

1975-11-20T23:59:59.000Z

424

Membrane Structure  

Science Journals Connector (OSTI)

...structure. The gen-cral picturc (given bs both of' these workeirs \\aas very similar...Circle No. 82 on Readers Service Card Low cost student recording from Harvard Apparatus...Steim, thermal analysis; D. Chapman, nuclear magnet-ic resonance; H. M. McConnell...

D. E. Green

1971-11-19T23:59:59.000Z

425

Glass Structure  

Science Journals Connector (OSTI)

... Structure and Crystallization of Glasses. By WernerVogel. Pp. 246. (Pergamon: Oxford and New York, October 1971. ... account of the experimental work on liquid-liquid separation and nucleation and crystal growth in glasses carried out by the author and his colleagues in the laboratories of VEB Jena ...

R. W. DOUGLAS

1972-04-07T23:59:59.000Z

426

Structural graphitic carbon foams  

SciTech Connect (OSTI)

Graphitic carbon foams are a unique material form with very high structural and thermal properties at a light weight. A process has been developed to produce microcellular, open-celled graphitic foams. The process includes heating a mesophase pitch preform above the pitch melting temperature in a pressurized reactor. At the appropriate time, the pressure is released, the gas nucleates bubbles, and these bubbles grow forming the pitch into the foam structure. The resultant foamed pitch is then stabilized in an oxygen environment. At this point a rigid structure exists with some mechanical integrity. The foam is then carbonized to 800 C followed by a graphitization to 2700 C. The shear action from the growing bubbles aligns the graphitic planes along the foam struts to provide the ideal structure for good mechanical properties. Some of these properties have been characterized for some of the foam materials. It is known that variations of the blowing temperature, blowing pressure and saturation time result in foams of variously sized with mostly open pores; however, the mechanism of bubble nucleation is not known. Therefore foams were blown with various gases to begin to determine the nucleation method. These gases are comprised of a variety of molecular weights as well as a range of various solubility levels. By examining the resultant structures of the foam, differences were noted to develop an explanation of the foaming mechanism.

Kearns, K.M.; Anderson, H.J. [Air Force Lab., Wright-Patterson AFB, OH (United States). Materials and Mfg. Directorate

1998-12-31T23:59:59.000Z

427

HIGHLY AUTOMATED MACROMOLECULAR  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AUTOMATED MACROMOLECULAR AUTOMATED MACROMOLECULAR CRYSTALLOGRAPHY BEAMLINE (AMX) Group Leader: Dieter Schneider Proposal Team: M. Allaire 1 , L. Berman 1 , M. Chance 2 , W. Hendrickson 3 , A. Héroux 1 , J. Jakoncic 1 , A. Orville 1 , H. Robinson 1 , D. Schneider 1 , W. Shi 2 , A. Soares 1 , V. Stojanoff 1 , R. Sweet 1 1 Brookhaven National Laboratory, 2 Case Western Reserve University, 3 Columbia University MISSION APPLICATIONS AND CAPABILITIES ADDITIONAL INFORMATION * AMX at NSLS-II will provide structural biologists with ready access to an advanced macromolecular crystallography (MX) beamline for the elucidation of structure and function of macromolecular complexes. * Its high flux, tunable energy, and natively small focal spot will make it a crystallographer's preferred beamline. * Its high degree of automation will provide a high throughput

428

Terminal structure  

DOE Patents [OSTI]

A terminal structure (2) for a superconducting cable (1) is described. It consists of a conductor (2a) and an insulator (2b) that surrounds the conductor (2a), wherein the superconducting cable (1) has a core with a superconducting conductor (5) and a layer of insulation that surrounds the conductor (5), and wherein the core is arranged in such a way that it can move longitudinally in a cryostat. The conductor (2a) of the terminal structure (2) is electrically connected with the superconducting conductor (5) or with a normal conductor (6) that is connected with the superconducting conductor (5) by means of a tubular part (7) made of an electrically conductive material, wherein the superconducting conductor (5) or the normal conductor (6) can slide in the part (7) in the direction of the superconductor.

Schmidt, Frank (Langenhagen, DE); Allais, Arnaud (Hannover, DE); Mirebeau, Pierre (Villebon sur Yvette, FR); Ganhungu, Francois (Vieux-Reng, FR); Lallouet, Nicolas (Saint Martin Boulogne, FR)

2009-10-20T23:59:59.000Z

429

Cryogenic structural materials for superconducting magnets  

SciTech Connect (OSTI)

This paper reviews research in the United States and Japan on structural materials for high-field superconducting magnets. Superconducting magnets are used for magnetic fusion energy devices and for accelerators that are used in particle-physics research. The cryogenic structural materials that we review are used for magnet cases and support structures. We expect increased materials requirements in the future.

Dalder, E.N.C.; Morris, J.W. Jr.

1985-02-22T23:59:59.000Z

430

A High-Performance PHEV Battery Pack  

Broader source: Energy.gov (indexed) [DOE]

a reliable and highly efficient thermal management system Objective Simple Structure and Manufacturing Positive terminal Negative terminal Lead film (insulation tape) Stack and...

431

National High Magnetic Field Laboratory - Publications  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lett. Physica B Physica C Physica E Polymer Polymer J. Proc. Physical Phenomena at High Magnetic Fields - IV Protein Science PROTEINS: Structure, Function and Genetics Rapid...

432

National High Magnetic Field Laboratory - Scientist Profiles...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

"Spatially resolved electronic structure inside and outside the vortex cores of a high-temperature superconductor", Nature 413, 501-504 (2001). 30. V. F. Mitrovi, E. E....

433

Developing High Capacity, Long Life Anodes  

Broader source: Energy.gov (indexed) [DOE]

long life and improved Safety for PHEV and EV applications. Objectives Develop a low cost synthesis methods to prepare high energy anodes Full structural and...

434

Structural, chemical, and electronic state on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] dense thin-film surfaces at high temperature - Surface segregation  

E-Print Network [OSTI]

The evolution of the surface topographic and electronic structure and chemical state of the La0.7Sr0.3MnO3 (LSMO) thin films were probed using Scanning Tunneling microscopy and X-ray photoelectron spectroscopy to identify ...

Jalili, Helia

435

Airfoil structure  

DOE Patents [OSTI]

Past airfoil configurations have been used to improve aerodynamic performance and engine efficiencies. The present airfoil configuration further increases component life and reduces maintenance by reducing internal stress within the airfoil itself. The airfoil includes a chord and a span. Each of the chord and the span has a bow being summed to form a generally "C" configuration of the airfoil. The generally "C" configuration includes a compound bow in which internal stresses resulting from a thermal temperature gradient are reduced. The structural configuration reduces internal stresses resulting from thermal expansion.

Frey, Gary A. (Poway, CA); Twardochleb, Christopher Z. (Alpine, CA)

1998-01-01T23:59:59.000Z

436

Airfoil structure  

DOE Patents [OSTI]

Past airfoil configurations have been used to improve aerodynamic performance and engine efficiencies. The present airfoil configuration further increases component life and reduces maintenance by reducing internal stress within the airfoil itself. The airfoil includes a chord and a span. Each of the chord and the span has a bow being summed to form a generally ``C`` configuration of the airfoil. The generally ``C`` configuration includes a compound bow in which internal stresses resulting from a thermal temperature gradient are reduced. The structural configuration reduces internal stresses resulting from thermal expansion. 6 figs.

Frey, G.A.; Twardochleb, C.Z.

1998-01-13T23:59:59.000Z

437

Controlling Graphene's Electronic Structure  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Controlling Graphene's Electronic Structure Print Controlling Graphene's Electronic Structure Print Graphene, because of its unusual electron properties, reduced dimensionality, and scale, has enormous potential for use in ultrafast electronic transistors. It exhibits high conductivity and an anomalous quantum Hall effect (a phenomenon exhibited by certain semiconductor devices at low temperatures and high magnetic fields). Among its novel properties, graphene's electrical charge carriers (electrons and holes) move through a solid with effectively zero mass and constant velocity, like photons. Graphene's intrinsically low scattering rate from defects implies the possibility of a new kind of electronics based on the manipulation of electrons as waves rather than particles. The primary technical difficulty has been controlling the transport of electrical charge carriers through the sheet. This area of research is known as bandgap engineering. While bandgap engineering is the basis of semiconductor technology, it is only now being applied to graphene. Using angle-resolved photoemission spectroscopy (ARPES) at ALS Beamline 7.0.1, a team of scientists from the ALS and Germany characterized the electronic band structure and successfully controlled the gap between valence and conduction bands in a bilayer of graphene thin films deposited on a substrate of silicon carbide. This was done by doping one sheet with adsorbed potassium atoms, creating an asymmetry between the two layers.

438

HYDROGEN CONCENTRATION AND DISTRIBUTION IN HIGH-PURITY GERMANIUM CRYSTALS  

E-Print Network [OSTI]

bubble. Evidence to resolve the structure of the pits can be obtained from the high temperature stability

Hansen, W.L.

2010-01-01T23:59:59.000Z

439

The Ohio State University South Campus High Rise  

E-Print Network [OSTI]

The Ohio State University South Campus High Rise Building & Utility Assessment Page 4.1 STRUCTURAL Campus High Rise Building & Utility Assessment Page 4.2 STRUCTURAL CONSTRAINTS The primary structural High Rise Building & Utility Assessment Page 4.3 CONNECTOR BUILDING The connector building discussed

440

Structural Characterization  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Characterization Characterization and Comparison of Switchgrass Ball-milled Lignin Before and After Dilute Acid Pretreatment Reichel Samuel & Yunqiao Pu & Babu Raman & Arthur J. Ragauskas Received: 25 April 2009 / Accepted: 10 August 2009 # Humana Press 2009 Abstract To reduce the recalcitrance and enhance enzymatic activity, dilute H 2 SO 4 pretreatment was carried out on Alamo switchgrass (Panicum virgatum). Ball-milled lignin was isolated from switchgrass before and after pretreatment. Its structure was characterized by 13 C, HSQC, and 31 P NMR spectroscopy. It was confirmed that ball-milled switchgrass lignin is of HGS type with a considerable amount of p-coumarate and felurate esters of lignin. The major ball-milled lignin interunit was the β-O-4 linkage, and a minor amount of phenylcoumarin, resinol, and spirodienone units were also present. As a result of the acid pretreatment,

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Armor structures  

DOE Patents [OSTI]

An armor structure includes first and second layers individually containing a plurality of i-beams. Individual i-beams have a pair of longitudinal flanges interconnected by a longitudinal crosspiece and defining opposing longitudinal channels between the pair of flanges. The i-beams within individual of the first and second layers run parallel. The laterally outermost faces of the flanges of adjacent i-beams face one another. One of the longitudinal channels in each of the first and second layers faces one of the longitudinal channels in the other of the first and second layers. The channels of the first layer run parallel with the channels of the second layer. The flanges of the first and second layers overlap with the crosspieces of the other of the first and second layers, and portions of said flanges are received within the facing channels of the i-beams of the other of the first and second layers.

Chu, Henry Shiu-Hung [Idaho Falls, ID; Lacy, Jeffrey M [Idaho Falls, ID

2008-04-01T23:59:59.000Z

442

High-resolution numerical simulation and analysis of Mach reflection structures in detonation waves in low-pressure H2 - O2 - Ar mixtures: a summary of results obtained with the adaptive mesh refinement framework AMROC  

SciTech Connect (OSTI)

Numerical simulation can be key to the understanding of the multi-dimensional nature of transient detonation waves. However, the accurate approximation of realistic detonations is demanding as a wide range of scales needs to be resolved. This paper describes a successful solution strategy that utilizes logically rectangular dynamically adaptive meshes. The hydrodynamic transport scheme and the treatment of the non-equilibrium reaction terms are sketched. A ghost fluid approach is integrated into the method to allow for embedded geometrically complex boundaries. Large-scale parallel simulations of unstable detonation structures of Chapman-Jouguet detonations in low-pressure hydrogen-oxygen-argon mixtures demonstrate the efficiency of the described techniques in practice. In particular, computations of regular cellular structures in two and three space dimensions and their development under transient conditions, i.e. under diffraction and for propagation through bends are presented. Some of the observed patterns are classified by shock polar analysis and a diagram of the transition boundaries between possible Mach reflection structures is constructed.

Deiterding, Ralf [ORNL

2011-01-01T23:59:59.000Z

443

NMR and Structural Genomics  

Science Journals Connector (OSTI)

NMR and Structural Genomics ... The role of NMR in structural genomics is outlined, with particular emphasis on using protein domains as targets. ... Targets in Structural Genomics ...

David Staunton; Jo Owen; Iain D. Campbell

2002-12-07T23:59:59.000Z

444

2009 Spring : Highly Distinguished Honors Highly Distinguished  

E-Print Network [OSTI]

Armstrong Anna P Highly Distinguished Armstrong Jack Ray Highly Distinguished Armstrong Sarah Rose Highly

Kasman, Alex

445

Process to make structured particles  

DOE Patents [OSTI]

Disclosed is a process for making a composite material that contains structured particles. The process includes providing a first precursor in the form of a dry precursor powder, a precursor liquid, a precursor vapor of a liquid and/or a precursor gas. The process also includes providing a plasma that has a high field zone and passing the first precursor through the high field zone of the plasma. As the first precursor passes through the high field zone of the plasma, at least part of the first precursor is decomposed. An aerosol having a second precursor is provided downstream of the high field zone of the plasma and the decomposed first material is allowed to condense onto the second precursor to from structured particles.

Knapp, Angela Michelle; Richard, Monique N; Luhrs, Claudia; Blada, Timothy; Phillips, Jonathan

2014-02-04T23:59:59.000Z

446

Global Lifetime Measurements of Highly-Deformed and Other Rotational Structures in the A~135 Light Rare-Earth Region: Probing the Single-Particle Motion in a Rotating Potential  

E-Print Network [OSTI]

It has been possible, using GAMMASPHERE plus Microball,to extract differential lifetime measurements free from common systematic errors for over 15 different nuclei (various isotopes of Ce, Pr, Nd, Pm, and Sm) at high spin within a single experiment. This comprehensive study establishes the effective single-particle quadrupole moments in the A~135 light rare-earth region. Detailed comparisons are made with calculations using the self-consistent cranked mean-field theory.

M. A. Riley; R. W. Laird; F. G. Kondev; D. J. Hartley; D. E. Archer; T. B. Brown; R. M. Clark; M. D evlin; P. Fallon; I. M. Hibbert; D. T. Joss; D. R. LaFosse; P. J. Nolan; N. J. O'Brien; E. S. Paul; J. Pfohl; D. G. Sarantites; R. K. Sheline; S. L. Shepherd; J. Simpson; R. Wadsworth; M. T. Matev; A. V. Afanasjev; J. Dobaczewski; G. A. Lalazissis; W. Nazarewicz; W. Satula

2001-05-15T23:59:59.000Z

447

High resolution crystal structure of rat long chain hydroxy acid oxidase in complex with the inhibitor 4-carboxy-5-[(4-chlorophenyl)sulfanyl]-1, 2, 3-thiadiazole. Implications for inhibitor specificity and drug design  

SciTech Connect (OSTI)

Long chain hydroxy acid oxidase (LCHAO) is responsible for the formation of methylguanidine, a toxic compound with elevated serum levels in patients with chronic renal failure. Its isozyme glycolate oxidase (GOX), has a role in the formation of oxalate, which can lead to pathological deposits of calcium oxalate, in particular in the disease primary hyperoxaluria. Inhibitors of these two enzymes may have therapeutic value. These enzymes are the only human members of the family of FMN-dependent L-2-hydroxy acid-oxidizing enzymes, with yeast flavocytochrome b{sub 2} (Fcb2) among its well studied members. We screened a chemical library for inhibitors, using in parallel rat LCHAO, human GOX and the Fcb2 flavodehydrogenase domain (FDH). Among the hits was an inhibitor, CCPST, with an IC{sub 50} in the micromolar range for all three enzymes. We report here the crystal structure of a complex between this compound and LCHAO at 1.3 {angstrom} resolution. In comparison with a lower resolution structure of this enzyme, binding of the inhibitor induces a conformational change in part of the TIM barrel loop 4, as well as protonation of the active site histidine. The CCPST interactions are compared with those it forms with human GOX and those formed by two other inhibitors with human GOX and spinach GOX. These compounds differ from CCPST in having the sulfur replaced with a nitrogen in the five-membered ring as well as different hydrophobic substituents. The possible reason for the {approx}100-fold difference in affinity between these two series of inhibitors is discussed. The present results indicate that specificity is an issue in the quest for therapeutic inhibitors of either LCHAO or GOX, but they may give leads for this quest.

Chen, Zhi-wei; Vignaud, Caroline; Jaafar, Adil; Lvy, Bernard; Guritte, Franoise; Gunard, Daniel; Lederer, Florence; Mathews, F. Scott (CNRS-UMR); (WU-MED)

2012-05-24T23:59:59.000Z

448

Electronic structure of superconductivity refined  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electronic structure of superconductivity refined Electronic structure of superconductivity refined Electronic structure of superconductivity refined A team of physicists propose a new model that expands on a little understood aspect of the electronic structure in high-temperature superconductors. July 10, 2008 Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials. Los Alamos National Laboratory sits on top of a once-remote mesa in northern New Mexico with the Jemez mountains as a backdrop to research and innovation covering multi-disciplines from bioscience, sustainable energy sources, to plasma physics and new materials.

449

High Tech High Chula Vista  

High Performance Buildings Database

Chula Vista, CA High Tech High Chula Vista is a public charter school serving 550 students in grades 9 to 12 with an approach rooted in project-based learning. The school fosters student engagement by knowing students well, tapping into student experience and interests, and building a strong sense of community. Through internships and projects based in the community, students collaborate with adults on work with meaning that extends well beyond the school walls.

450

High field gradient particle accelerator  

DOE Patents [OSTI]

A high electric field gradient electron accelerator utilizing short duration, microwave radiation, and capable of operating at high field gradients for high energy physics applications or at reduced electric field gradients for high average current intermediate energy accelerator applications is disclosed. Particles are accelerated in a smooth bore, periodic undulating waveguide, wherein the period is so selected that the particles slip an integral number of cycles of the r.f. wave every period of the structure. This phase step of the particles produces substantially continuous acceleration in a traveling wave without transverse magnetic or other guide means for the particle. 10 figs.

Nation, J.A.; Greenwald, S.

1989-05-30T23:59:59.000Z

451

High field gradient particle accelerator  

DOE Patents [OSTI]

A high electric field gradient electron accelerator utilizing short duration, microwave radiation, and capable of operating at high field gradients for high energy physics applications or at reduced electric field gradients for high average current intermediate energy accelerator applications. Particles are accelerated in a smooth bore, periodic undulating waveguide, wherein the period is so selected that the particles slip an integral number of cycles of the r.f. wave every period of the structure. This phase step of the particles produces substantially continuous acceleration in a traveling wave without transverse magnetic or other guide means for the particle.

Nation, John A. (Ithaca, NY); Greenwald, Shlomo (Haifa, IL)

1989-01-01T23:59:59.000Z

452

The structure and reactivity of a low-sulfur lacustrine oil shale (Colorado U.S.A.) compared with those of a high-sulfur marine oil shale (Julia Creek, Queensland, Australia)  

Science Journals Connector (OSTI)

Abstract Oil shales from two different continents (Australia and North America) of different ages (100 and 40millionyears) and origins (one marine, one lacustrine) have been reacted in the range 355425C under H2 or N2 for 1 or 5h with or without the addition of catalyst. The shales differed in S content, and the nature of the mineral matter, but both had high atomic H/C ratios. The overall reactivity of the two shales was similar and high yields of soluble products could be obtained under relatively mild conditions with only small CO2 yields, but the temperature dependence of reactivity and the effect of potential catalysts differed markedly. Increasing the temperature and time led to increases in conversion but of different extents. Substituting H2 for N2 led to a large increase to conversion for the lower-atomic-H/C ratio marine oil shale. The \\{CH2Cl2\\} solubles from the marine oil shale showed a larger range of compounds than those from the lacustrine oil shale which resembled the \\{CH2Cl2\\} solubles from torbanite, a coal-like material derived from lacustrine algae.

Mohammad W. Amer; Marc Marshall; Yi Fei; W. Roy Jackson; Martin L. Gorbaty; Peter J. Cassidy; Alan L. Chaffee

2014-01-01T23:59:59.000Z

453

Structural Rearrangements in Water Viewed Through Two- Dimensional Infrared Spectroscopy  

E-Print Network [OSTI]

Compared with other molecular liquids, water is highly structured because of its ability to form up to four hydrogen bonds, resulting in a tetrahedral network of molecules. However, this underlying intermolecular structure ...

Roberts, Sean Thomas

454

New Crystal Structures Lift Fog around Protein Folding  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

New Crystal Structures Lift Fog around Protein Folding New Crystal Structures Lift Fog around Protein Folding Print Wednesday, 25 July 2012 00:00 Nature's proteins set a high bar...

455

Structure and function of Pseudomonas aeruginosa protein PA1324 (21170)  

E-Print Network [OSTI]

Northwest National Laboratory, Biological Sciences Division, Northeast Structural Genomics Consortium and Northeast Structural Genomics Consortium, Miami University, Oxford, Ohio 45056 Received 12 June 2008 aeruginosa PA1324; NMR; functional genomics; NMR high-throughput screens; protein-ligand binding; protein

Powers, Robert

456

High Field Magnetic Resonance Facility  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

HFMRF Overview HFMRF Overview Section 2-3-1 High Field Magnetic Resonance Facility The High Field Magnetic Resonance Facility (HFMRF) focuses a significant portion of its research on developing a fundamental, molecular-level understanding of biochemical and biological systems and their response to environmental effects. A secondary focus is materials science, including catalysis and chemical mechanisms and processes. Staff and science consultants within this facility offer expertise in the areas of structural biology, solid-state materials characterization, and magnetic resonance imaging (MRI) techniques. Research activities in the HFMRF include: * structure determination of large molecular assemblies such as protein-DNA (normal and damaged DNA) and protein-RNA complexes

457

The structure and emission model of the relativistic jet in the quasar 3C 279 inferred from radio to high-energy gamma-ray observations in 2008-2010  

E-Print Network [OSTI]

We present time-resolved broad-band observations of the quasar 3C 279 obtained from multi-wavelength campaigns conducted during the first two years of the Fermi Gamma-ray Space Telescope mission. While investigating the previously reported gamma-ray/optical flare accompanied by a change in optical polarization, we found that the optical emission appears delayed with respect to the gamma-ray emission by about 10 days. X-ray observations reveal a pair of `isolated' flares separated by ~90 days, with only weak gamma-ray/optical counterparts. The spectral structure measured by Spitzer reveals a synchrotron component peaking in the mid-infrared band with a sharp break at the far-infrared band during the gamma-ray flare, while the peak appears in the mm/sub-mm band in the low state. Selected spectral energy distributions are fitted with leptonic models including Comptonization of external radiation produced in a dusty torus or the broad-line region. Adopting the interpretation of the polarization swing involving pr...

Hayashida, M; Nalewajko, K; Sikora, M; Wehrle, A E; Ogle, P; Collmar, W; Larsson, S; Fukazawa, Y; Itoh, R; Chiang, J; Stawarz, L; Blandford, R D; Richards, J L; Max-Moerbeck, W; Readhead, A; Buehler, R; Cavazzuti, E; Ciprini, S; Gehrels, N; Reimer, A; Szostek, A; Tanaka, T; Tosti, G; Uchiyama, Y; Kawabata, K S; Kino, M; Sakimoto, K; Sasada, M; Sato, S; Uemura, M; Yamanaka, M; Greiner, J; Kruehler, T; Rossi, A; Macquart, J P; Bock, D C -J; Villata, M; Raiteri, C M; Agudo, I; Aller, H D; Aller, M F; Arkharov, A A; Bach, U; Benitez, E; Berdyugin, A; Blinov, D A; Blumenthal, K; Boettcher, M; Buemi, C S; Carosati, D; Chen, W P; Di Paola, A; Dolci, M; Efimova, N V; Forne, E; Gomez, J L; Gurwell, M A; Heidt, J; Hiriart, D; Jordan, B; Jorstad, S G; Joshi, M; Kimeridze, G; Konstantinova, T S; Kopatskaya, E N; Koptelova, E; Kurtanidze, O M; Lahteenmaki, A; Lamerato, A; Larionov, V M; Larionova, E G; Larionova, L V; Leto, P; Lindfors, E; Marscher, A P; McHardy, I M; Molina, S N; Morozova, D A; Nikolashvili, M G; Nilsson, K; Reinthal, R; Roustazadeh, P; Sakamoto, T; Sigua, L A; Sillanpaa, A; Takalo, L; Tammi, J; Taylor, B; Tornikoski, M; Trigilio, C; Troitsky, I S; Umana, G

2012-01-01T23:59:59.000Z

458

Refinement of the crystal structure of the high-temperature phase G0 in (NH4)2WO2F4 (powder, x-ray, and neutron scattering)  

SciTech Connect (OSTI)

The (NH4)2WO2F4 compound undergoes a series of phase transitions: G0 -> 201 K -> G1 -> 160 K -> G2, with a significant change in entropy ( S1 ~ Rln10 at the G0 -> G1 transition), which indicates significant orientational disordering in the G0 phase and the order disorder type of the phase transition. X-ray diffraction is used to identify the crystal structure of the G0 phase as rhombohedral (sp. gr. Cmcm, Z = 4), determine the lattice parameters and the positions of all atoms (except hydrogen), and show that [WO2F4]2 ions can form a superposition of dynamic and static orientational disorders in the anionic sublattice. A determination of the orientational position of [NH4]+ ions calls for the combined method of elastic and inelastic neutron scattering. Inelastic neutron scattering is used to determine the state of hindered rotation for ammonium ions in the G0 phase. Powder neutron diffraction shows that the orientational disorder of NH4 ions can adequately be described within the free rotation approximation.

Novak, D. M. [Joint Institute for Nuclear Research, Dubna, Russia; Smirnov, Lev S [Alikhanov Institute for Theoretical and Experimental Physics, Moscow, Russia; Kolesnikov, Alexander I [ORNL; Voronin, Vladimir [Institute of Metal Physics, Russia; Berger, I. F. [Institute of Metal Physics, Russia; Laptash, N. M. [Institute of Chemistry, Vladivostok, Russia; Vasil'ev, N. M. [Kirensky Institute of Physics, Krasnoyarsk, Russia; Flerov, I. N. [Kirensky Institute of Physics, Krasnoyarsk, Russia

2013-01-01T23:59:59.000Z

459

Refinement of the crystal structure of the high-temperature phase G{sub 0} in (NH{sub 4}){sub 2}WO{sub 2}F{sub 4} (powder, X-ray, and neutron scattering)  

SciTech Connect (OSTI)

The (NH{sub 4}){sub 2}WO{sub 2}F{sub 4} compound undergoes a series of phase transitions: G{sub 0} {yields} 201, K {yields} G{sub 1} {yields} 160, and K {yields} G{sub 2}, with a significant change in entropy ({Delta}S{sub 1} {approx} Rln10 at the G{sub 0} {yields} G{sub 1} transition), which indicates significant orientational disordering in the G{sub 0} phase and the order-disorder type of the phase transition. X-ray diffraction is used to identify the crystal structure of the G{sub 0} phase as rhombohedral (sp. gr. Cmcm, Z = 4), determine the lattice parameters and the positions of all atoms (except hydrogen), and show that [WO{sub 2}F{sub 4}]{sup 2-} ions can form a superposition of dynamic and static orientational disorders in the anionic sublattice. A determination of the orientational position of [NH{sub 4}]{sup +} ions calls for the combined method of elastic and inelastic neutron scattering. Inelastic neutron scattering is used to determine the state of hindered rotation for ammonium ions in the G{sub 0} phase. Powder neutron diffraction shows that the orientational disorder of NH{sub 4} ions can adequately be described within the free-rotation approximation.

Novak, D. M., E-mail: dmn@nf.jinr.ru; Smirnov, L. S. [Joint Institute for Nuclear Research, Frank Neutron Physics Laboratory (Russian Federation)] [Joint Institute for Nuclear Research, Frank Neutron Physics Laboratory (Russian Federation); Kolesnikov, A. I. [Oak Ridge National Laboratory, Neutron Scattering Sciences Division (United States)] [Oak Ridge National Laboratory, Neutron Scattering Sciences Division (United States); Voronin, V. I.; Berger, I. F. [Russian Academy of Sciences, Institute of Metal Physics, Ural Branch (Russian Federation)] [Russian Academy of Sciences, Institute of Metal Physics, Ural Branch (Russian Federation); Laptash, N. M. [Russian Academy of Sciences, Institute of Chemistry, Far Eastern Branch (Russian Federation)] [Russian Academy of Sciences, Institute of Chemistry, Far Eastern Branch (Russian Federation); Vasil'ev, A. D.; Flerov, I. N. [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation)] [Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Branch (Russian Federation)

2013-01-15T23:59:59.000Z

460

Sandia National Laboratories: Structural Health Monitoring  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and reduce downtime. A particular focus is to mitigate the large rise in costs for offshore O&M due to access difficulty, weather, high sea states, etc. using structural health...

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Structural Complexity of a Composite Amyloid Fibril  

E-Print Network [OSTI]

The molecular structure of amyloid fibrils and the mechanism of their formation are of substantial medical and biological importance, but present an ongoing experimental and computational challenge. An early high-resolution ...

Lewandowski, Jozef R.

462

Structure glass technology : systems and applications  

E-Print Network [OSTI]

Glass cannot compete with steel in terms of strength or durability, but it is the only structural material that offers the highly sought after qualities of translucency and transparency. The use of glass has evolved from ...

Leitch, Katherine K. (Katherine Kristen)

2005-01-01T23:59:59.000Z

463

Method of casting patterned dielectric structures  

DOE Patents [OSTI]

A pattern of dielectric structures are formed directly on a substrate in a single step using sol-gel chemistry and molding procedures. The resulting dielectric structures are useful in vacuum applications for electronic devices. Porous, lightweight structures having a high aspect ratio that are suitable for use as spacers between the faceplate and baseplate of a field emission display can be manufactured using this method.

Poco, John F. (Livermore, CA); Hrubesh, Lawrence W. (Livermore, CA)

2001-01-01T23:59:59.000Z

464

Gaussian beams in inhomogeneous anisotropic layered structures  

E-Print Network [OSTI]

Gaussian beams in inhomogeneous anisotropic layered structures Vlastislav Cerven´y 1 ) and Ivan@ig.cas.cz. Summary Gaussian beams concentrated close to rays of high-frequency seismic body waves prop- agating in an inhomogeneous anisotropic layered structure are studied. The amplitude profiles of the Gaussian beam along

Cerveny, Vlastislav

465

Heat pipe with embedded wick structure  

DOE Patents [OSTI]

A heat pipe has an embedded wick structure that maximizes capillary pumping capability. Heat from attached devices such as integrated circuits evaporates working fluid in the heat pipe. The vapor cools and condenses on a heat dissipation surface. The condensate collects in the wick structure, where capillary pumping returns the fluid to high heat areas. 7 figs.

Adkins, D.R.; Shen, D.S.; Tuck, M.R.; Palmer, D.W.; Grafe, V.G.

1998-06-23T23:59:59.000Z

466

Correlation between superconductivity and structural properties under high pressure of iron pnictide superconductor Ce[subscript 0.6]Y[subscript 0.4]FeAsO[subscript 0.8]F[subscript 0.2  

SciTech Connect (OSTI)

We report here the pressure dependence of the electrical resistivity and magnetic susceptibility of polycrystalline Ce{sub 0.6}Y{sub 0.4}FeAsO{sub 0.8}F{sub 0.2} superconductor in the temperature range 4 K to 300 K up to 8 GPa. In-situ high pressure-low temperature x-ray diffraction was performed at 8 K up to 32 GPa using synchrotron x-rays with helium pressure medium. The results show that the applied pressure slightly increases the T{sub c} up to 1 GPa and then it decreases on further pressure increase. The reduction of superconducting transition temperature occurs with a transition to a collapsed tetragonal phase and may be associated with a possible valence change of Ce.

Kanagaraj, M.; Arumugam, S.; Kumar, Ravhi S.; Selvan, N.R. Tamil; Muthu, S. Esakki; Prakash, J.; Thakur, Gohil S.; Yoshino, H.; Murata, K.; Matsubayashi, K.; Uwatoko, Y.; Sinogeikin, S.; Cornelius, Andrew; Ganguli, A.K.; Zhao, Yusheng (IIT-India); (UNLV); (U of Tokyo); (Bharathidasan); (Osaka)

2012-02-28T23:59:59.000Z

467

Design and control of hierarchically structured nanomaterials  

E-Print Network [OSTI]

by these structures are obtained. Zeolites also contain highly uniform pores, with sizes ranging from approximately three to ten angstroms in diameter. This is a consequence of crystallinity. These small but well- defined pores allow for unique separation... by these structures are obtained. Zeolites also contain highly uniform pores, with sizes ranging from approximately three to ten angstroms in diameter. This is a consequence of crystallinity. These small but well- defined pores allow for unique separation...

Carr, Charles Shane

2005-11-01T23:59:59.000Z

468

Permanent magnet design for high-speed superconducting bearings  

DOE Patents [OSTI]

A high temperature superconducting bearing including a permanent magnet rotor levitated by a high temperature superconducting structure is disclosed. The rotor preferably includes one or more concentric permanent magnet rings coupled to permanent magnet ring structures having substantially triangular and quadrangular cross-sections. Both alternating and single direction polarity magnet structures can be used in the bearing. 9 figs.

Hull, J.R.; Uherka, K.L.; Abdoud, R.G.

1996-09-10T23:59:59.000Z

469

Structural Code Considerations for Solar Rooftop Installations.  

SciTech Connect (OSTI)

Residential rooftop solar panel installations are limited in part by the high cost of structural related code requirements for field installation. Permitting solar installations is difficult because there is a belief among residential permitting authorities that typical residential rooftops may be structurally inadequate to support the additional load associated with a photovoltaic (PV) solar installation. Typical engineering methods utilized to calculate stresses on a roof structure involve simplifying assumptions that render a complex non-linear structure to a basic determinate beam. This method of analysis neglects the composite action of the entire roof structure, yielding a conservative analysis based on a rafter or top chord of a truss. Consequently, the analysis can result in an overly conservative structural analysis. A literature review was conducted to gain a better understanding of the conservative nature of the regulations and codes governing residential construction and the associated structural system calculations.

Dwyer, Stephen F.; Dwyer, Brian P.; Sanchez, Alfred

2014-12-01T23:59:59.000Z

470

Structural organization of gap junction channels  

Science Journals Connector (OSTI)

Gap junctions were initially described morphologically, and identified as semi-crystalline arrays of channels linking two cells. This suggested that they may represent an amenable target for electron and X-ray crystallographic studies in much the same way that bacteriorhodopsin has. Over 30 years later, however, an atomic resolution structural solution of these unique intercellular pores is still lacking due to many challenges faced in obtaining high expression levels and purification of these structures. A variety of microscopic techniques, as well as NMR structure determination of fragments of the protein, have now provided clearer and correlated views of how these structures are assembled and function as intercellular conduits. As a complement to these structural approaches, a variety of mutagenic studies linking structure and function have now allowed molecular details to be superimposed on these lower resolution structures, so that a clearer image of pore architecture and its modes of regulation are beginning to emerge.

Gina E. Sosinsky; Bruce J. Nicholson

2005-01-01T23:59:59.000Z

471

High energy and high excitement  

Science Journals Connector (OSTI)

......definite, stream of energy. Most previous optical...If there is a slower car in front on a highway...result, which are akin to car collisions. These gigantic clouds of high-energy electrons, now seen...outcrops. However, an alternative possibility is that the......

Peter Bond

2001-02-01T23:59:59.000Z

472

Method of manufacturing a heat pipe wick with structural enhancement  

DOE Patents [OSTI]

Heat pipe wick structure wherein a stout sheet of perforated material overlays a high performance wick material such as stainless steel felt affixed to a substrate. The inventive structure provides a good flow path for working fluid while maintaining durability and structural stability independent of the structure (or lack of structure) associated with the wick material. In one described embodiment, a wick of randomly laid .about.8 micron thickness stainless steel fibers is sintered to a metal substrate and a perforated metal overlay.

Andraka, Charles E. (Albuquerque, NM); Adkins, Douglas R. (Albuquerque, NM); Moreno, James B. (Albuquerque, NM); Rawlinson, K. Scott (Albuquerque, NM); Showalter, Steven K. (Albuquerque, NM); Moss, Timothy A. (Albuquerque, NM)

2006-10-24T23:59:59.000Z

473

9 - Structures in Matlab  

Science Journals Connector (OSTI)

This chapter explains both structures and vectors of structures in Matlab. The chapter starts by explaining the need for a structure class in programming usage and how structures can be used to improve the readability of Matlab programs. A number of examples that explain structures in Matlab are given here. The chapter concludes with the fox and rabbit game project. The reader is encouraged here to program this game using structures in order to gain an in-depth understanding of their use and value. Keywords Structures, vectors of structures, fox and rabbit game

Munther Gdeisat; Francis Lilley

2013-01-01T23:59:59.000Z

474

Nanotechnology enterprise in the United States: structure and location.  

E-Print Network [OSTI]

??This thesis investigates the structure and location of the nanotechnology enterprise in the United States. Nanotechnology merits focus because of the high degree of innovative (more)

Bhaskarabhatla, Ajay Sivaram

2006-01-01T23:59:59.000Z

475

Progress Report for Structural Genomics Science Theme, year 1  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

University), Gaetano T. Montelione (Rutgers University) The Northeast Structural Genomics Consortium (NESGC, www.nesg.org) used EMSL's High Field NMR facility in 2006-2007 to...

476

Ultra Large Castings for Lightweight Vehicle Structures ?AMD...  

Broader source: Energy.gov (indexed) [DOE]

high volume casting process capable of producing large, thin-walled aluminum or magnesium castings.* HPDCs are not suitable for most primary automotive body structural...

477

New Crystal Structures Lift Fog around Protein Folding  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

New Crystal Structures Lift Fog around Protein Folding Print Nature's proteins set a high bar for nanotechnology. Macromolecules forged from peptide chains of amino acids, these...

478

Structures of cellulose acetate membranes for reverse osmosis  

Science Journals Connector (OSTI)

Studies under the scanning electron microscope have shown that the cellulose acetate membranes used for reverse osmosis are high-molecular-weight condensation structures of...

I. N. Vlodavets; G. Z. Nefedova

1977-01-01T23:59:59.000Z

479

Residual Stresses for Structural Analysis and Fatigue Life Prediction...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Analysis and Fatigue Life Prediction in Vehicle Components: Success stories from the High Temperature Materials Laboratory (HTML) User Program Residual Stresses for Structural...

480

Structure of Synaptic Connectors Solved  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structure of Synaptic Connectors Solved Print Structure of Synaptic Connectors Solved Print Establishment of neural connections at specialized intercellular junctions called synapses is critical for proper brain function, and errors in the process are thought to be associated with autism and other disorders. Researchers from Stanford University and the University of Texas Southwestern Medical Center have reported high-resolution, three-dimensional structures of the proteins, called neuroligin-1 and neurexin-1β, that form this connection. Because mutations in the neurexin and neuroligin genes are among the multiple genetic causes of autism, understanding the molecular mechanism of these proteins in synapse development is a first step towards development of novel therapeutics directed to treat and possibly cure autism.

Note: This page contains sample records for the topic "highly structured biomimetic" from the National Library of EnergyBeta (NLEBeta).
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481

Structure of Synaptic Connectors Solved  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structure of Synaptic Connectors Solved Print Structure of Synaptic Connectors Solved Print Establishment of neural connections at specialized intercellular junctions called synapses is critical for proper brain function, and errors in the process are thought to be associated with autism and other disorders. Researchers from Stanford University and the University of Texas Southwestern Medical Center have reported high-resolution, three-dimensional structures of the proteins, called neuroligin-1 and neurexin-1β, that form this connection. Because mutations in the neurexin and neuroligin genes are among the multiple genetic causes of autism, understanding the molecular mechanism of these proteins in synapse development is a first step towards development of novel therapeutics directed to treat and possibly cure autism.

482

Collective network for computer structures  

DOE Patents [OSTI]

A system and method for enabling high-speed, low-latency global collective communications among interconnected processing nodes. The global collective network optimally enables collective reduction operations to be performed during parallel algorithm operations executing in a computer structure having a plurality of the interconnected processing nodes. Router devices ate included that interconnect the nodes of the network via links to facilitate performance of low-latency global processing operations at nodes of the virtual network and class structures. The global collective network may be configured to provide global barrier and interrupt functionality in asynchronous or synchronized manner. When implemented in a massively-parallel supercomputing structure, the global collective network is physically and logically partitionable according to needs of a processing algorithm.

Blumrich, Matthias A. (Ridgefield, CT); Coteus, Paul W. (Yorktown Heights, NY); Chen, Dong (Croton On Hudson, NY); Gara, Alan (Mount Kisco, NY); Giampapa, Mark E. (Irvington, NY); Heidelberger, Philip (Cortlandt Manor, NY); Hoenicke, Dirk (Ossining, NY); Takken, Todd E. (Brewster, NY); Steinmacher-Burow, Burkhard D. (Wernau, DE); Vranas, Pavlos M. (Bedford Hills, NY)

2011-08-16T23:59:59.000Z

483

Structure of Synaptic Connectors Solved  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Structure of Synaptic Connectors Solved Print Structure of Synaptic Connectors Solved Print Establishment of neural connections at specialized intercellular junctions called synapses is critical for proper brain function, and errors in the process are thought to be associated with autism and other disorders. Researchers from Stanford University and the University of Texas Southwestern Medical Center have reported high-resolution, three-dimensional structures of the proteins, called neuroligin-1 and neurexin-1β, that form this connection. Because mutations in the neurexin and neuroligin genes are among the multiple genetic causes of autism, understanding the molecular mechanism of these proteins in synapse development is a first step towards development of novel therapeutics directed to treat and possibly cure autism.

484

Shrinkage and pore structure in preparation of carbon aerogels  

Science Journals Connector (OSTI)

Aerogels are nanoporous solid materials with high surface area, high porosity, and low density [1]. Due to their unique nanometer network and nanoporous structure, which suppress the gaseous thermal conduction si...

Junzong Feng; Jian Feng; Changrui Zhang

2011-08-01T23:59:59.000Z

485

Structural stability of andesite volcanoes and lava domes  

Science Journals Connector (OSTI)

...limit equilibrium analysis (LEA) methods...high degree of reliability. The principles...quantitative stability analyses developed. It...highly uncertain reliability. By mid-May...Finite element analysis of deformation...Structural Mechanics Reactor Technology, Chicago...

2000-01-01T23:59:59.000Z

486

Robust nite-di erence modelling of complex structures1  

E-Print Network [OSTI]

with the 1Proc. of HIGH PERFORMANCE COMPUTING IN SEISMIC MODELLING, An International Sympo- sium, Zaragoza-difference modelling of complex structures Paper No. 15 in Proc. of Int. Symposium on High Performance Computing

Oprsal, Ivo

487

DEVELOPMENT OFA WIRELESS ACTIVE SYSTEM FOR TPS STRUCTURAL HEALTH MONITORING  

E-Print Network [OSTI]

TPS damage. Several essential aspects are being studied: (a) development of high temperature aspects are being studied: (a) development of high temperature piezoelectric wafer active sensor (HTDEVELOPMENT OFA WIRELESS ACTIVE SYSTEM FOR TPS STRUCTURAL HEALTH MONITORING Victor Giurgiutiu1

Giurgiutiu, Victor

488

The impact of retail rate structures on the economics of commercial photovoltaic systems in California  

E-Print Network [OSTI]

at Different Levels of Penetration, by Rate Structure Fromhigh levels of PV penetration, retail rates with high demandat high PV penetration levels compared to rates that are

Mills, Andrew D.

2009-01-01T23:59:59.000Z

489

The Impact of Retail Rate Structures on the Economics of Commercial Photovoltaic Systems in California  

E-Print Network [OSTI]

at Different Levels of Penetration, by Rate Structure Fromhigh levels of PV penetration, retail rates with high demandat high PV penetration levels compared to rates that are

Mills, Andrew

2009-01-01T23:59:59.000Z

490

Earth Structure Introduction  

E-Print Network [OSTI]

Earth Structure Introduction Earth Structure (2nd Edition), 2004 W.W. Norton & Co, New York Slide show by Ben van der Pluijm © WW Norton, unless noted otherwise #12;© EarthStructure (2nd ed) 210/4/2010 Aerial views #12;© EarthStructure (2nd ed) 310/4/2010 http://www.globalchange.umich.edu/Ben/ES/ #12

491

Design/installation and structural integrity assessment under the Federal Facility Agreement for Bethel Valley Low-Level Waste Collection and Transfer System upgrade for Building 2026 (High Radiation Level Analytical Laboratory) and Building 2099 (Monitoring and Control Station) at Oak Ridge National Laboratory  

SciTech Connect (OSTI)

This document presents a Design/Installation and Structural Integrity Assessment for a replacement tank system for portions of the Bethel Valley Low Level Waste (LLW) System, located at the Oak Ridge Reservation, Oak Ridge, Tennessee. This issue of the assessment covers the design aspects of the replacement tank system, and certifies that the design has sufficient structural integrity and is acceptable for the storing or treating of hazardous and/or radioactive substances. The present issue identifies specific activities that must be completed during the fabrication, installation, and testing of the replacement tank system in order to provide assurance that the final installation complies with governing requirements. Portions of the LLW system are several decades old, or older, and do not comply with current environmental protection regulations. Several subsystems of the LLW system have been designated to receive a state-of-the-art replacement and refurbishment. One such subsystem serves Building 2026, the High Radiation Level Analytical Laboratory. This assessment focuses on the scope of work for the Building 2026 replacement LLW Collection and Transfer System, including the provision of a new Monitoring and Control Station (Building 2099) to receive, store, and treat (adjust pH) low level radioactive waste.

Not Available

1994-10-01T23:59:59.000Z

492

Protein Structure Prediction and Structural Genomics  

Science Journals Connector (OSTI)

...large-scale modeling calculations have...accuracy by comparative modeling. Even with structural...as a result of a rapid increase in alignment...structures will allow the modeling of a very much larger...development of molecular simulation methods, attempts...macromolecules (40). Automated methods for deducing...

David Baker; Andrej Sali