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Sample records for mem guatemala date

  1. University of Utah Guatemala Archaeological Research Opportunities

    E-Print Network [OSTI]

    Tipple, Brett

    University of Utah Guatemala Archaeological Research Opportunities Dates: June 20, 2015 thru August 5, 2015 Credits 3 credits per course Course Number: Guatemala Field Research 3 Credit hours Anth Activity Fees: $1350 plus airfare to Guatemala City or Flores/ Santa Elena, Peten, Guatemala Deadline: May

  2. (Consultecnia, Guatemala City (Guatemala)); Altseimer, J.; Thayer...

    Office of Scientific and Technical Information (OSTI)

    Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion) 15 GEOTHERMAL ENERGY; 60 APPLIED LIFE SCIENCES; DEHYDRATORS; DESIGN; OPERATION; PERFORMANCE;...

  3. Perfil Ambiental de Guatemala

    E-Print Network [OSTI]

    Lopez-Carr, David

    Perfil Ambiental de Guatemala Informe sobre el estado del ambiente y bases para su evaluación sistemática Guatemala, 2004 UNIVERSIDAD RAFAEL LANDÍVAR Facultad de Ciencias Ambientales y Agrícolas Instituto de Guatemala Informe sobre el estado del ambiente y bases para su evaluación sistemática ISBN: 99922

  4. Correlating the Ancient Maya and Modern European Calendars with High-Precision AMS 14C Dating

    E-Print Network [OSTI]

    2013-01-01

    Williams, L. O. Flora of Guatemala. Fieldiana Botany 24. (tropical city of Tikal, Guatemala. Proc. Nat. Acad. Sci 109,Maya city of Tikal (Guatemala) that carry carved dates that

  5. VIGILANTE: Violence and Security in Postwar Guatemala

    E-Print Network [OSTI]

    Sharp, Ellen Jane

    2014-01-01

    of Historic Memory Project) 1998 Guatemala: Nunca Más.Guatemala City: ODHA (Human Rightsof the Archbishop of Guatemala). Remijinse, Simone 2002

  6. MEMS @MEMS @ Texas TechTexas Tech

    E-Print Network [OSTI]

    Gelfond, Michael

    MEMS @MEMS @ Texas TechTexas Tech #12;MEMS Research @ TTUMEMS Research @ TTU MEMS Design and Fabrication MEMS Testing, Characterization & Control MEMS Integration and Application MEMS Education MEMS Organization #12;MEMS Design, SimulationMEMS Design, Simulation and Fabricationand Fabrication AutoCAD (TTU

  7. Policy of Primary Health Care in Guatemala

    E-Print Network [OSTI]

    Longchamp, Carla P

    1988-01-01

    26. Simon, Jean-Marie. Guatemala, Eternal Spring, EternalPeace Accords 'Don't Apply‘ In Guatemala”, Leporton Guatemala, March/April, 1966, pp. 3-4. 26. Agency for

  8. Isolation, Integration, and Ethnic Boundaries in Rural Guatemala

    E-Print Network [OSTI]

    Pebley, Anne R.; Goldman, Noreen; Robles, Arodys

    2002-01-01

    Language Revitalization in Guatemala” in S. Garzon, R. M.Maya Cultural Activism in Guatemala. Austin: Univ. of TexasMaya Cultural Activism in Guatemala. Austin: University of

  9. Choices about Treatment for ARI and Diarrhea in Rural Guatemala

    E-Print Network [OSTI]

    Goldman, Noreen; Pebley, Anne R.; Gragnolati, Michele

    2000-01-01

    economic well-being in Guatemala. Unpublished manuscript.diarrhea in highland Guatemala. Medical Anthropology 12(4),symptoms in rural Guatemala. Annales de la Societe. Belge de

  10. Roshni Naik, '09 San Lucas Toliman, Guatemala

    E-Print Network [OSTI]

    Roshni Naik, '09 San Lucas Toliman, Guatemala For six weeks, I spent my summer of service in rural Guatemala on Lake Atitlan. Lake Atitlan is one of the biggest lakes in Guatemala, and it is surrounded I saw the lack of health education and prevention among the rural poor population in Guatemala. I

  11. LAS HORMIGAS (HYMENOPTERA: FORMICIDAE) DE GUATEMALA

    E-Print Network [OSTI]

    Miller, Scott

    LAS HORMIGAS (HYMENOPTERA: FORMICIDAE) DE GUATEMALA 1Department of Entomology, University, Universidad de San Carlos de Guatemala, Guatemala, Correo electrónico: laury.saenz@gmail.com MICHAEL G Guatemala y los países colindantes de la región mesoamericana. Se presen- ta una lista actualizada de las

  12. Volcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, Guatemala 1111

    E-Print Network [OSTI]

    Rose, William I.

    Volcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, GuatemalaVolcano Hazards at Fuego and Acatenango, Guatemala 11111 Open-File Report 01­431Open-File Report 01

  13. Analytical study on arbitrary waveform generation by MEMS micro mirror arrays.

    E-Print Network [OSTI]

    Kalyoncu, Salih K; Huang, Yuewang; Song, Qi; Boyraz, Ozdal

    2012-01-01

    waveform generation by MEMS micro mirror arrays Salih K.generation technique by using MEMS digital micro-mirrormodulator [11,12]. Up to date MEMS micro-mirror arrays have

  14. Testimonio transformed : from I, Rigoberta to Guatemala, Nunca más and Guatemala, Memoria del silencio

    E-Print Network [OSTI]

    Metz, Cristina

    2011-01-01

    Palma Murga. eds. ¿Racismo en Guatemala? Abriendo el debatesobre un tema tabú. Guatemala: AVANCSO, 2004. Booth, JohnViolence, and the Crisis in Guatemala: A Case Study in the

  15. MEMS Resonant Strain Sensor Integration

    E-Print Network [OSTI]

    Myers, David Richard

    2010-01-01

    MEMS Capacitive BasedStrain Gauges MEMS Double-Ended Tuning Fork Strainand MEMS Potential . . . . . . . . . . . . . . . . . . . .

  16. MEMS Design Synthesis Based on Hybrid Evolutionary Computation B.S. (Tongji University, Shanghai) 1995

    E-Print Network [OSTI]

    Agogino, Alice M.

    MEMS Design Synthesis Based on Hybrid Evolutionary Computation by Ying Zhang B.S. (Tongji is approved: Chair Date Date Date Date University of California, Berkeley Fall 2006 #12;MEMS Design Synthesis Based on Hybrid Evolutionary Computation © 2006 by Ying Zhang #12;1 Abstract MEMS Design Synthesis Based

  17. DATE:

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

    3-12 DATE: December 7, 2012 TO: Procurement Directors FROM: Director Contract and Financial Assistance Policy Division Office of Policy Office of Acquisition and Project Management...

  18. DATE:

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

    4-35 DATE: July 09, 2014 TO: Procurement Directors FROM: Director Contract and Financial Assistance Policy Division Office of Policy Office of Acquisition and Project Management...

  19. Diamond and Polycrystalline Diamond for MEMS Applications: Simulations and Experiments

    E-Print Network [OSTI]

    Çagin, Tahir

    Diamond and Polycrystalline Diamond for MEMS Applications: Simulations and Experiments Tahir C¸ a Communication Systems, El Segundo, CA 90025, U.S.A. Abstract To date most of the MEMS devices are been based both to surface chemistry and cohesive energy density of these likely MEMS bearing materials. Therefore

  20. Living on Scorched Earth: the Political Ecology of Land Ownership in Guatemala's Northern Lowlands

    E-Print Network [OSTI]

    Ybarra, Megan

    2010-01-01

    perspectivas de desarrollo sostenible en Petén. Guatemala:perspectivas de desarrollo sostenible en Petén. Guatemala:

  1. DATE:

    Office of Legacy Management (LM)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal Gas &SCE-SessionsSouth DakotaRobbins and Myers Co -VANaval ,, *' ;x-L*Qwner -RL5- DATE:

  2. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  3. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  4. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  5. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  7. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:5

  8. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:5

  9. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  10. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  11. DATE:

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i n c i p aDepartmentEnergyEveryCustomerD= DOE/RG-0067 o y e=Burden45 DATE:

  12. Karstic mountain almost conquered. [Guatemala

    SciTech Connect (OSTI)

    Not Available

    1982-06-10

    International design and construction teams building a 300-Mw hydroelectric system high in central Guatemala's rugged mountains since 1977 have persevered through karstic-limestone nightmares, logistical bottlenecks and political upheaval to bring the $700-million Rio Chixoy project close to completion. The costly power push, requiring the largest construction effort in Guatemala's modern history, plays a critical role for the future. When all five Pelton-wheel turbines are spinning late next year, their output will more than double electricity production in Central America's poorest, most populous country. Despite numerous delays, design changes and cost increases above the original $240-million bid package, work has progressed to the final stages on a 360-ft-high rockfill dam, 16-mile power tunnel and aboveground powerhouse.

  13. Living on Scorched Earth: the Political Ecology of Land Ownership in Guatemala's Northern Lowlands

    E-Print Network [OSTI]

    Ybarra, Megan

    2010-01-01

    T. , and M. Melville. 1971. Guatemala: the politics of landBajas del Norte de Guatemala: Petén y la Franja Transversaldel Norte. Ciudad de Guatemala: FLACSO, MINUGUA, CONTIERRA.

  14. Norman B. Schwartz. Forest Society: A Social History of Peten, Guatemala. University of Oklahoma Press, 1990.

    E-Print Network [OSTI]

    Herrera, Robinson

    1991-01-01

    A Social History of Peten, Guatemala. University of Oklahomathe highland region of Guatemala, Schwartz worked heavily inon colonial lowland Guatemala. Lamentably these chapters

  15. Availability, prices and affordability of the World Health Organization's essential medicines for children in Guatemala

    E-Print Network [OSTI]

    Anson, Angela; Ramay, Brooke; de Esparza, Antonio; Bero, Lisa

    2012-01-01

    0622, USA. 2 La Universidad del Valle de Guatemala, VistaHermosa III, GuatemalaCity, Guatemala 01015. 3 Cedar Associates, Menlo Park, CA

  16. Fertility and the Environment in a Natural Resource Dependent Economy: Evidence from Petén, Guatemala

    E-Print Network [OSTI]

    Sutherland, Elizabeth G; Carr, David L; Curtis, Siân L

    2005-01-01

    degradation: The case of Guatemala." Ambio 21: 460-464.tenure in the Petén, Guatemala. Flores, Petén, Fulbrighty recursos naturales. Guatemala, Instituto Nacional de

  17. ReadyMade Analysis of Hospital de la Familia’s Cataract Surgery Program in Guatemala

    E-Print Network [OSTI]

    Brown, Clair; Freeman, Eric; Belohlav, Kate; Chait, Ariel; Thal, Lawrence

    2012-01-01

    Surgery Program in Guatemala Clair Brown, Eric Freeman, Kates Cataract Surgery Program in Guatemala 1 Goal: Improve thedaily life for people in Guatemala who do not normally have

  18. From the Past to the Present: The Guatemala STD Study and Multi-Layered Bioethical Critique

    E-Print Network [OSTI]

    Gonzalez, Alicia

    2014-01-01

    Reverby, Susan. “The Guatemala STD Inoculation Studies: WhatService Research in Guatemala: Toward New Scholarship. ”the Maya” in The Guatemala Reader: History, Culture,

  19. The comadrona and response to obstetrical emergencies : maternal mortality in highland Guatemala

    E-Print Network [OSTI]

    Copeland, Margaret Hemphill

    2011-01-01

    related care in rural Guatemala. Ethnicity & Health 5 (1):services in rural Guatemala. Social Science & Medicine.Partthe Marlin mine in western Guatemala. Science of the Total

  20. Experiencing Maya Palaces: Royal Power, Space, and Architecture at Holmul, Guatemala

    E-Print Network [OSTI]

    Mongelluzzo, Ryan

    2011-01-01

    The Ruins of Holmul Guatemala. Peabody Museum, Cambridge.Authentic Maya 2005 Guatemala: Cradle of Mayan Civilization.Period Holmul Region, Guatemala, Vanderbilt University.

  1. MEMS Resonant Strain Sensor Integration

    E-Print Network [OSTI]

    Myers, David Richard

    2010-01-01

    Strap-down microelectromechanical MEMS sensors for high-gdate of microelectromechanical systems (MEMS) is a bitmicroelectromechanical resonant output gyroscope. MEMS 2002,

  2. Testimonio transformed : from I, Rigoberta to Guatemala, Nunca más and Guatemala, Memoria del silencio

    E-Print Network [OSTI]

    Metz, Cristina

    2011-01-01

    cases it investigated, gender violence always equaled rape.196 Rape in Guatemala was not an aberration; it was an actfurther characterization of rape diverges at a few points.

  3. (Surveying isolated diesel power stations in Guatemala)

    SciTech Connect (OSTI)

    Waddle, D.B.

    1990-02-26

    I travelled to Guatemala City, Guatemala, to lead a team of specialists to study the operating, administrative, and management efficiency of isolated diesel power plants, operated by Instituto Nacional de Electrificacion (INDE). The study is part of a global initiative managed jointly by the Agency for International Development and the World Bank. The power plants were audited, including INDE's largest isolated diesel station, and two, much smaller municipal and privately owned stations. I returned to Oak Ridge on February 22, 1990.

  4. Guatemala: World Oil Report 1991

    SciTech Connect (OSTI)

    Not Available

    1991-08-01

    This paper reports that government officials have been working on changes to the hydrocarbon law to make it easier for operators to explore. In a reform effort, Minister of Energy and Mines Carlos Hutarte brought a new staff dedicated to spurring oil development into office with him. This includes the Directorate of Hydrocarbons, which held a three-day seminar in Dallas, Texas, to acquaint U.S. firms with new policies. Only one company, Basic Resources International, has been operating in Guatemala over the last year. The firm drilled three onshore wells in 1990 for 16,499 ft, including one oil producer. Two further onshore wells are slated this year. Oil production from 14 active wells out of 16 capable averaged 3,943 bpd, up 8.4% from 1989. Reserves are 191 MMbbl.

  5. MS.5 MICROSYSTEMS TECHNOLOGY LABORATORIES ANNUAL RESEARCH REPORT 2009 MEMS & BioMEMS MEMS & BioMEMS

    E-Print Network [OSTI]

    microelectromechanical systems (MEMS) present several drawbacks including expense, incompatibility with flexibleMS.5 MICROSYSTEMS TECHNOLOGY LABORATORIES ANNUAL RESEARCH REPORT 2009 MEMS & BioMEMS MEMS & BioMEMS MATERiALS Direct Patterning of Metallic MEMS through Microcontact Printing C. E. Packard, A. Murarka, V

  6. Short communication Observations of eruptive activity at Santiaguito volcano, Guatemala

    E-Print Network [OSTI]

    Rose, William I.

    Short communication Observations of eruptive activity at Santiaguito volcano, Guatemala Gregg J volcano, Guatemala, from the vantage point of its parent, Santa Mari´a. We have taken 12 h of digital

  7. Geomorphology and natural hazards of the Samala river basin, Guatemala

    E-Print Network [OSTI]

    in Guatemala for their rele- vant assistance during my time together with them. The list of my friends

  8. A New Species of Cryptotriton (Caudata: Plethodontidae) from Eastern Guatemala

    E-Print Network [OSTI]

    Wake, David B.

    A New Species of Cryptotriton (Caudata: Plethodontidae) from Eastern Guatemala Carlos R. Va (Plethodontidae) is described from the mountains of eastern Guatemala. The new species is distinguished from all~as del este de Guatemala. Cryptotriton sierraminensis se distingue de todos los otros miembros de su ge

  9. Scientific Notes 649 LEPIDOPTERA ASSOCIATED WITH AVOCADO FRUIT IN GUATEMALA

    E-Print Network [OSTI]

    Hoddle, Mark S.

    Scientific Notes 649 LEPIDOPTERA ASSOCIATED WITH AVOCADO FRUIT IN GUATEMALA MARK S. HODDLE1- raceae) evolved in the eastern and central high- lands of Mexico, Guatemala, and the Pacific Coast), and Guatemala (10) (FAOSTAT 2009). California, the fourth largest producer of avocados in the world (FAOSTAT

  10. Surface temperature and spectral measurements at Santiaguito lava dome, Guatemala

    E-Print Network [OSTI]

    Rose, William I.

    Surface temperature and spectral measurements at Santiaguito lava dome, Guatemala Steve T. M, Michigan Technological University, Houghton, Michigan, USA Otoniel Matias INSIVUMEH, Guatemala City, Guatemala Received 4 June 2004; revised 23 July 2004; accepted 20 September 2004; published 13 October 2004

  11. forest certification in guatemala yale school of forestry & environmental studies

    E-Print Network [OSTI]

    forest certification in guatemala yale school of forestry & environmental studies 363 * Fernando@catie.ac.cr ***** Gustavo Pinelo, B.Sc. Coordinator, TREES/ Rainforest Alliance Petén, Guatemala gpinelo@ra.org Forest Certification in Guatemala Fernando Carrera,* Dietmar Stoian,** José Joaquin Campios,*** Julio Morales

  12. Nutritional Assessment of the Elderly of San Pedro Ayampuc, Guatemala: Evaluation of Anthropometry, Biochemistry, and Helminthic Infection

    E-Print Network [OSTI]

    King, Jane E

    1991-01-01

    y Asistencia Social. Guatemala en Cifras de Salud AnuarioSan Pedro Ayampuc, Guatemala: Evaluation of Anthropometry,of San Pedro Ayampuc, Guatemala, without whose enthusiasm

  13. The Obsidian Blade Sequence at El Ujuxte, a Late Preclassic Site on the South Coast of Guatemala

    E-Print Network [OSTI]

    C. Roger Nance; Jan de Leeuw

    2011-01-01

    Industries of Pacific Guatemala and El Salvador: The PacificSociety in Pacific Guatemala: Settlements and Chronologyof the Río Naranjo, Guatemala. Papers of the New World

  14. Impact of integrating HIV and TB care and treatment in a regional tuberculosis hospital in rural Guatemala

    E-Print Network [OSTI]

    2014-01-01

    12. WHO. Tuberculosis profile for Guatemala. In: AssistanceMoHaS, editor. GuatemalaCity, Guatemala. 2011. https://extranet.who.int/ sree/

  15. Unthinkable Rebellion and the Praxis of the Possible: Ch'orti' Campesin@ Struggles in Guatemala's Eastern Highlands

    E-Print Network [OSTI]

    Casolo, Jennifer Jean

    2011-01-01

    y Chiquimula (PROZACHI), Guatemala. Paper presented at theCojtí Cuxil, D. (1997). El Movimiento Maya (en Guatemala).Guatemala City: Editorial Cholsamaj. Connelly, M. P. , Li,

  16. The Obsidian Blade Sequence at El Ujuxte, a Late Preclassic Site on the South Coast of Guatemala

    E-Print Network [OSTI]

    Nance, C. Roger; de Leeuw, Jan

    2005-01-01

    Industries of Pacific Guatemala and El Salvador: The PacificSociety in Pacific Guatemala: Settlements and Chronologyof the Río Naranjo, Guatemala. Papers of the New World

  17. Impact of reduced maternal exposures to wood smoke from an introduced chimney stove on newborn birth weight in rural Guatemala

    E-Print Network [OSTI]

    2011-01-01

    contributors in Guatemala: B. Arana, the Guatemalan Ministryduring pregnancy in rural Guatemala. Environ Health Perspecthouseholds of highland Guatemala. Environ Sci Technol 35(

  18. Youth Sexual Risk-Taking in Latin America: Implications for Public Health and Policy in Mexico, Belize, and Guatemala

    E-Print Network [OSTI]

    Dunning, Denise Raquel

    2012-01-01

    from Chile, Barbados, Guatemala, and Mexico, Studies inpdf10/10wpds_eng.pdf UNICEF. At A Glance: Guatemala.www.unicef.org/infobycountry/guatemala_statistics.html

  19. Youth Sexual Risk-Taking in Latin America: Implications for Public Health and Policy in Mexico, Belize, and Guatemala

    E-Print Network [OSTI]

    Dunning, Denise Raquel

    2012-01-01

    evidence from Chile, Barbados, Guatemala, and Mexico,evidence from Chile, Barbados, Guatemala, and Mexico,evidence from Chile, Barbados, Guatemala, and Mexico,

  20. Atmospheric lead in downtown Guatemala City

    SciTech Connect (OSTI)

    Durando, M.L.; Aragon, S.R.

    1982-01-01

    Atomic absorption (AA) analysis was employed to determine, for the first time in this country, lead concentrations in aerosols collected in Nuclepore filter media during the months of February and March (1980) in Guatemala City, Guatemala. In particular, the lead in the atmospheric fine particulate was measured in different downtown locations around noontime and in a single location at 1-h intervals throughout the day. The first was used to study short-term variations from one location to the other, and the second one was used to correlate parameters such as traffic density and wind velocity with the levels of airborne lead on the same day. In addition, this paper presents a brief discussion of the lead content in Guatemalan gasoline, the lead levels in street dusts, and the total suspended particulate matter in downtown Guatemala City.

  1. Eigenproblems in Resonant MEMS Design

    E-Print Network [OSTI]

    California at Davis, University of

    Eigenproblems in Resonant MEMS Design David Bindel UC Berkeley, CS Division Eigenproblems inResonant MEMS Design ­ p.1/21 #12;What are MEMS? Eigenproblems inResonant MEMS Design ­ p.2/21 #12;RF MEMSResonant MEMS Design ­ p.3/21 #12;Micromechanical filters Filtered signal Mechanical filter Capacitive sense

  2. MEMS technology for timing and frequency control

    E-Print Network [OSTI]

    Nguyen, CTC

    2007-01-01

    regard, microelectromechanical systems (MEMS) technology,focus upon microelectromechanical systems (MEMS) and include

  3. MTL ANNUAL RESEARCH REPORT 2014 MEMS, etc. 47 MEMS, Field-Emitter,

    E-Print Network [OSTI]

    Reif, Rafael

    MTL ANNUAL RESEARCH REPORT 2014 MEMS, etc. 47 MEMS, Field-Emitter, Thermal, Fluidic Devices Printed MEMS Membrane Electrostatic Microspeakers...................................................................................................................................52 MEMS Tactile Displays

  4. MEMS Resonant Strain Sensor Integration

    E-Print Network [OSTI]

    Myers, David Richard

    2010-01-01

    down microelectromechanical MEMS sensors for high-g munitionof making harsh environment MEMS sensors is the ability toG load forces. SiC MEMS sensors and actuators have potential

  5. Failure mechanisms in MEMS.

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen

    2003-07-01

    MEMS components by their very nature have different and unique failure mechanisms than their macroscopic counterparts. This paper discusses failure mechanisms observed in various MEMS components and technologies. MEMS devices fabricated using bulk and surface micromachining process technologies are emphasized. MEMS devices offer uniqueness in their application, fabrication, and functionality. Their uniqueness creates various failure mechanisms not typically found in their bulk or IC counterparts. In ICs, electrical precautions are taken to mitigate failure. In MEMS, both electrical and mechanical precautions must be enacted to reduce the risk of failure and increased reliability. Unlike ICs, many MEMS components are designed to interact with their environment, making the fabrication, testing, and packaging processes critical for the success of the device.

  6. FALLOW MANAGEMENT PRACTICES IN GUATEMALA'S WESTERN HIGHLANDS: SOCIAL DRIVERS AND BIOPHYSICAL IMPACTSy

    E-Print Network [OSTI]

    FALLOW MANAGEMENT PRACTICES IN GUATEMALA'S WESTERN HIGHLANDS: SOCIAL DRIVERS AND BIOPHYSICAL practices in the Western Highlands of Guatemala based on interdisciplinary data collected using fertility; Buddleia skutchii; Baccharis vaccinioides; Andisol; Guatemala INTRODUCTION At any given time

  7. Risk of sexually transmitted infections among Mayan women in rural Guatemala whose partners are migrant workers

    E-Print Network [OSTI]

    Ikeda, JM; Schaffer, JR; Ixcot, MLS; Page, K; Hearst, N

    2014-01-01

    aids/ Countries/lac/guatemala_profile.pdf (2010). AccessedHIV and AIDS study among Mayan populations in Guatemala.Guatemala City: National HIV/AIDS program and UN Population

  8. Climate drying and associated forest decline in the lowlands of northern Guatemala during the late Holocene

    E-Print Network [OSTI]

    Gilli, Adrian

    Climate drying and associated forest decline in the lowlands of northern Guatemala during the late 2008 Keywords: Guatemala Holocene Lake sediments Environmental changes Tropical palaeoclimate of northern Guatemala. The question remains as to whether this vegetation change was driven exclusively

  9. Dancing in the Altiplano : K'iche' Maya culture in motion in contemporary highland Guatemala

    E-Print Network [OSTI]

    Taube, Rhonda Beth

    2009-01-01

    estructura social del valle de Guatemala en el siglo XVI. InEncuesta Sobre La Cultura de Los Ladinos en Guatemala. Vol.Social Guatemalteca. Guatemala: Editorial del Ministerio de

  10. The Role of Ethnicity in Father Absence and Children’s School Enrollment in Guatemala

    E-Print Network [OSTI]

    Ishida, Kanako

    2010-01-01

    de los mayas de ciudad de Guatemala. In M. Gonza lez de lade la Mujer K’iche’. Guatemala: IDESAC. Carson, M. (2006).la Elite de Poder en Guatemala. In A. Bianch, C. R. Hale, &

  11. Satellites and Senses of Place: Remote Monitoring of Guatemala's Maya Biosphere Reserve

    E-Print Network [OSTI]

    Rahder, Micha

    2014-01-01

    Freedom House 2012 Guatemala. http://www.freedomhouse.org/and M. Cristina 2004 Lynching in Guatemala Legacy of War andMaya Forest of Belize, Guatemala, and Mexico. Pp. 111–124.

  12. MEM.H

    E-Print Network [OSTI]

    /* mem.h Memory manipulation functions Copyright (c) Borland International 1987 All Rights Reserved. */ #if __STDC__ #define _Cdecl #else #define _Cdecl

  13. Granados-Dieseldorff, Christensen, Kihn-Pineda -Ichthyofauna of Lachu Lake, Alta Verapaz, Guatemala Granados-Dieseldorff, Christensen, Kihn-Pineda -Ichthyofauna of Lachu Lake, Alta Verapaz, Guatemala

    E-Print Network [OSTI]

    , Guatemala © Granados-Dieseldorff, Christensen, Kihn-Pineda - Ichthyofauna of Lachuá Lake, Alta Verapaz, Guatemala 1 PHOTO ALBUM Ichthyofauna of Lachuá Lake, Alta Verapaz, Guatemala Examples of the Ichthyofauna of Lachuá Lake, Alta Verapaz, Guatemala (Granados-Dieseldorff 2001 and Granados-Dieseldorff et al 2012

  14. MEMS Aluminum Nitride Technology for Inertial Sensors

    E-Print Network [OSTI]

    Vigevani, Gabriele

    2011-01-01

    1, the growth of angular rate MEMS sensor is a growingdominant market in MEMS inertial sensors - with millions ofsector of the MEMS inertial sensor market. Being able to

  15. MEMS Aluminum Nitride Technology for Inertial Sensors

    E-Print Network [OSTI]

    Vigevani, Gabriele

    2011-01-01

    110 Working principle of a MEMS resonatingin IMU and in general for MEMS integrated solutions. To myand growing sector of MEMS industry. Market re- search ?rm

  16. Sign problem and MEM

    E-Print Network [OSTI]

    Masahiro Imachi; Yasuhiko Shinno; Hiroshi Yoneyama

    2006-01-13

    The sign problem is notorious in Monte Carlo simulations of lattice QCD with the finite density, lattice field theory (LFT) with a $\\theta$ term and quantum spin models. In this report, to deal with the sign problem, we apply the maximum entropy method (MEM) to LFT with the $\\theta$ term and investigate to what extent the MEM is applicable to this issue. Based on this study, we also make a brief comment about lattice QCD with the finite density in terms of the MEM.

  17. The effects of migrant remittances on population–environment dynamics in migrant origin areas: international migration, fertility, and consumption in highland Guatemala

    E-Print Network [OSTI]

    Davis, Jason; Lopez-Carr, David

    2010-01-01

    in fertility patterns in Guatemala. Population, Space andRemittances and poverty in Guatemala. World Bank Policythe Maya Biosphere Reserve, Guatemala. Human Ecology, 36(2),

  18. The impacts of sex work regulations and implementation of immigration policies on Central American sex workers' safety and health along the Mexico-Guatemala border

    E-Print Network [OSTI]

    Rocha Jiménez, Teresita

    de Límites y Aguas entre México y Guatemala. (2000).Terrestre entre México y Guatemala tiene una extensión totaldiplomatico_especial/guatemala_comision _ limites_aguas.pdf

  19. The magmatic plumbing system beneath Santiaguito Volcano, Guatemala Jeannie A.J. Scott a,

    E-Print Network [OSTI]

    Rose, William I.

    The magmatic plumbing system beneath Santiaguito Volcano, Guatemala Jeannie A.J. Scott a, , Tamsin, Guatemala City, Guatemala a b s t r a c ta r t i c l e i n f o Article history: Received 9 September 2011 storage Ascent path The silicic dome complex of Santiaguito, Guatemala, has exhibited continuous extrusive

  20. The Marriage Core of the Elite Network of Colonial Guatemala Narda Alcntara Valverde*

    E-Print Network [OSTI]

    White, Douglas R.

    The Marriage Core of the Elite Network of Colonial Guatemala Narda Alcántara Valverde* Silvia of Colonial Guatemala 1 The Marriage Core of the Elite Network of Colonial Guatemala1 Abstract The problem the core of the elite network of colonial Guatemala in the period 1640 and 1820 in structural terms

  1. SO2 emissions to the atmosphere from active volcanoes in Guatemala and El Salvador, 19992002

    E-Print Network [OSTI]

    Rose, William I.

    SO2 emissions to the atmosphere from active volcanoes in Guatemala and El Salvador, 1999 INSIVUMEH, 7a Avenida 14-57 Zona 13, Ciudad de Guatemala, Guatemala, Central America c Servicio Nacional de-based and aircraft correlation spectrometer (COSPEC) measurements at the principal active volcanoes in Guatemala

  2. mem.c

    E-Print Network [OSTI]

    525, container = ___alloc_mem (extra + (words+modulus) * ___WS8);. 526. 527, if (container ..... 1066, if (waste > ___PSECTION_WASTE32 || words > ___PSECTION_SIZE4096). 1067, return ...... 1988, int i2 = find_msection (

  3. Templeton Mem. Freedom Coll. 

    E-Print Network [OSTI]

    Unknown

    2011-08-17

    This thesis presents an improved method for dynamic force computation applicable to both electrostatic and electromagnetic conductors with complex 3D geometries. During the transient simulation of electrostatic actuated MEMS, the positions...

  4. Templeton Mem. Freedom Coll. 

    E-Print Network [OSTI]

    Unknown

    2011-08-17

    method for dynamic force computation applica- ble to both electrostatic and electromagnetic conductors with complex 3D geometries. During the transient simulation of electrostatic actuated MEMS, the positions of the conductors as well as the potential... applied to the conductors may change, necessitat- ing recalculation of electrostatic forces at each time step of computation. Similarly, during the simulation of electromagnetic actuated MEMS, the current re-distribution in the conductors requires...

  5. Introduction to Microelectromechanical Systems (MEMS) failure...

    Office of Scientific and Technical Information (OSTI)

    Conference: Introduction to Microelectromechanical Systems (MEMS) failure analysis. Citation Details In-Document Search Title: Introduction to Microelectromechanical Systems (MEMS)...

  6. MEMS in microfluidic channels.

    SciTech Connect (OSTI)

    Ashby, Carol Iris Hill; Okandan, Murat; Michalske, Terry A.; Sounart, Thomas L.; Matzke, Carolyn M.

    2004-03-01

    Microelectromechanical systems (MEMS) comprise a new class of devices that include various forms of sensors and actuators. Recent studies have shown that microscale cantilever structures are able to detect a wide range of chemicals, biomolecules or even single bacterial cells. In this approach, cantilever deflection replaces optical fluorescence detection thereby eliminating complex chemical tagging steps that are difficult to achieve with chip-based architectures. A key challenge to utilizing this new detection scheme is the incorporation of functionalized MEMS structures within complex microfluidic channel architectures. The ability to accomplish this integration is currently limited by the processing approaches used to seal lids on pre-etched microfluidic channels. This report describes Sandia's first construction of MEMS instrumented microfluidic chips, which were fabricated by combining our leading capabilities in MEMS processing with our low-temperature photolithographic method for fabricating microfluidic channels. We have explored in-situ cantilevers and other similar passive MEMS devices as a new approach to directly sense fluid transport, and have successfully monitored local flow rates and viscosities within microfluidic channels. Actuated MEMS structures have also been incorporated into microfluidic channels, and the electrical requirements for actuation in liquids have been quantified with an elegant theory. Electrostatic actuation in water has been accomplished, and a novel technique for monitoring local electrical conductivities has been invented.

  7. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    Judy, “Microelectromechanical systems (MEMS): fabrication,Packaging of Microelectromechanical Systems (MEMS),” IEEEbased on microelectromechanical systems (MEMS). However, one

  8. Tomato chocolate spot virus, a member of a new torradovirus species that causes a necrosis-associated disease of tomato in Guatemala

    E-Print Network [OSTI]

    Batuman, O.; Kuo, Y.-W.; Palmieri, M.; Rojas, M. R.; Gilbertson, R. L.

    2010-01-01

    disease of tomato in Guatemala O. Batuman • Y. -W. Kuo • M.Abstract Tomatoes in Guatemala have been affected by a newUniversity of Valle de Guatemala, Guatemala City, Republic

  9. MEMS Actuated Deformable Mirror

    SciTech Connect (OSTI)

    Papavasiliou, A; Olivier, S; Barbee, T; Walton, C; Cohn, M

    2005-11-10

    This ongoing work concerns the creation of a deformable mirror by the integration of MEMS actuators with Nanolaminate foils through metal compression boning. These mirrors will use the advantages of these disparate technologies to achieve dense actuation of a high-quality, continuous mirror surface. They will enable advanced adaptive optics systems in large terrestrial telescopes. While MEMS actuators provide very dense actuation with high precision they can not provide large forces typically necessary to deform conventional mirror surfaces. Nanolaminate foils can be fabricated with very high surface quality while their extraordinary mechanical properties enable very thin, flexible foils to survive the rigors of fabrication. Precise metal compression bonding allows the attachment of the fragile MEMS actuators to the thin nanolaminate foils without creating distortions at the bond sites. This paper will describe work in four major areas: (1) modeling and design, (2) bonding development, (3) nanolaminate foil development, (4) producing a prototype. A first-principles analytical model was created and used to determine the design parameters. A method of bonding was determined that is both strong, and minimizes the localized deformation or print through. Work has also been done to produce nanolaminate foils that are sufficiently thin, flexible and flat to be deformed by the MEMS actuators. Finally a prototype was produced by bonding thin, flexible nanolaminate foils to commercially available MEMS actuators.

  10. MEMS fluidic actuator

    DOE Patents [OSTI]

    Kholwadwala, Deepesh K. (Albuquerque, NM); Johnston, Gabriel A. (Trophy Club, TX); Rohrer, Brandon R. (Albuquerque, NM); Galambos, Paul C. (Albuquerque, NM); Okandan, Murat (Albuquerque, NM)

    2007-07-24

    The present invention comprises a novel, lightweight, massively parallel device comprising microelectromechanical (MEMS) fluidic actuators, to reconfigure the profile, of a surface. Each microfluidic actuator comprises an independent bladder that can act as both a sensor and an actuator. A MEMS sensor, and a MEMS valve within each microfluidic actuator, operate cooperatively to monitor the fluid within each bladder, and regulate the flow of the fluid entering and exiting each bladder. When adjacently spaced in a array, microfluidic actuators can create arbitrary surface profiles in response to a change in the operating environment of the surface. In an embodiment of the invention, the profile of an airfoil is controlled by independent extension and contraction of a plurality of actuators, that operate to displace a compliant cover.

  11. (Solar energy technology transfer, Guatemala City, Guatemala and Tegucigalpa, Honduras, August 20--August 30, 1989)

    SciTech Connect (OSTI)

    Waddle, D.B.

    1989-09-05

    I travelled to Guatemala City, Guatemala and to Tegucigalpa, Honduras to gather information regarding the possibility of transferring photovoltaic technology for rural household uses in each respective country. Meetings were held with US government officials in each country mission (USAID and the commercial attaches); with utility officials; cooperative managers; and PVO's. The overall response was very positive; two of the electric utilities interviewed would like to begin program design immediately. A coffee cooperative with 38,000 members also expressed a keen interest in putting into place a program similar to the photovoltaic household energy program established in the Dominican Republic. The purpose of the trip was to establish lines of communication with perspective project cooperators; that objective was accomplished.

  12. Festival Report: II Taller Centroamericano y del Caribe: Guatemala

    E-Print Network [OSTI]

    Bravo-Elizondo, Pedro

    1991-10-01

    Ricardo 152 LATIN AMERICAN THEATRE REVIEW Mendoza, salvadoreño radicado en Costa Rica; Maquillaje, por Damián Félix, panameño y finalmente Danza Teatro por María Méndez quien trabaja en Grecia, pero está de asueto en Guatemala. Hubo diferentes paneles...

  13. (Survey of three isolated diesel power stations in Guatemala)

    SciTech Connect (OSTI)

    Chronowski, R.A.

    1990-03-15

    I traveled to Guatemala City, Guatemala to participate with a team of specialists to study the operating, administrative, and management efficiency of isolated diesel power plants, operated by Instituto Nacional de Electrificacion (INDE). The study is part of a global initiative managed jointly by the Agency for International Development and the World Bank. The power plants were audited, including INDE's largest isolated diesel station, and two much smaller municipal and privately owned stations. I returned to the USA on February 20, 1990.

  14. Tilting at MEMS Windmills for Energy Harvesting?

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    Tilting at MEMS Windmills for Energy Harvesting? Bill Schweber - February 19, 2015 MEMS and Development (yes, it was print), I saw the story "Micro-Windmills: From Lab to Market" on MEMS devices whichMEMS Technologies, a Taiwan-based company. Figure 1: The nickel-based MEMS micro-windmill can be bulk

  15. MEMS Materials and Temperature Sensors for Down Hole Geothermal System Monitoring

    E-Print Network [OSTI]

    Wodin-Schwartz, Sarah

    2013-01-01

    MEMS for Geothermal Monitoring . . . . . . . . . . . . .Existing MEMS Capacitive Temperature Sensors . . . . .In-Plane MEMS Temperature Sensor

  16. Trajectory-switching algorithm for a MEMS gyroscope

    E-Print Network [OSTI]

    Park, Sungsu; Horowitz, Roberto; Hong, Sung Kyung; Nam, Yoonsu

    2007-01-01

    roscope, microelectromechanical systems (MEMS), trajectoryI NTRODUCTION OST microelectromechanical-system (MEMS) gyro-

  17. Knowledge-Based Evolutionary Linkage in MEMS Design Synthesis

    E-Print Network [OSTI]

    Cobb, Corie L.; Zhang, Ying; Agogino, Alice M.; Mangold, Jennifer

    2008-01-01

    Introduction Microelectromechanical Systems (MEMS) are smallindustries for microelectromechanical sys- tems (MEMS). In:

  18. Knowledge-Based Evolutionary Linkage in MEMS Design Synthesis

    E-Print Network [OSTI]

    Cobb, Corie L.; Zhang, Ying; Agogino, Alice M.; Mangold, Jennifer

    2008-01-01

    and industries for microelectromechanical sys- tems (MEMS).1 Introduction Microelectromechanical Systems (MEMS) are

  19. First demonstration of a MEMS tunable vertical-cavity SOA

    E-Print Network [OSTI]

    2004-01-01

    amplifiers, microelectromechanical (MEMS) devices, opticalpromising method is microelectromechanical (MEMS) tuning. In

  20. The Effects of Migrant Remittances on Consumption in Highland Guatemala Jason Davis

    E-Print Network [OSTI]

    Lopez-Carr, David

    The Effects of Migrant Remittances on Consumption in Highland Guatemala Jason Davis DavidL. Carr This paper investigates the potential impact of migrant remittances on consumption in highland Guatemala

  1. MEMS technology for timing and frequency control

    E-Print Network [OSTI]

    Nguyen, CTC

    2007-01-01

    L. Kubena, and Y. -K. Yong, “A MEMS-based quartz resonatorT. -C. Nguyen, “Vibrating RF MEMS overview: applications tosupport,” in Proc. IEEE Int. MEMS Conf. , Maastricht, The

  2. BLDG. 80 (SU), RM. 106 561.297.1208 WWW.FAU.EDU/GOABROAD Guatemala Chapines

    E-Print Network [OSTI]

    Fernandez, Eduardo

    BLDG. 80 (SU), RM. 106 · 561.297.1208 · WWW.FAU.EDU/GOABROAD Guatemala Chapines Rising Tides of Lake Atitlan Antigua, Guatemala AAnnttiigguuaa,, GGuuaatteemmaallaa SSpprriinngg TTeerrmm Program 1 will benefit from an immersion into the rich culture of Guatemala and have opportunities to study medical

  3. Der Beitrag der deutschen Entwicklungszusammenarbeit zur Entschrfung der Flchtlings-und Migrationsproblematik: Die Fallstudie Guatemala

    E-Print Network [OSTI]

    Franz, Sven Oliver

    Migrationsproblematik: Die Fallstudie Guatemala Inaugural-Dissertation zur Erlangung der Doktorwürde der Philosophischen migración es un delito."1 (Schriftzug an der Tür einer Hütte in einem Dorf Guatemalas) ,,Es gibt kein................................................................................. 44 3 Die Fallstudie Guatemala: Die Fluchtfolgen im Aufnahmeland Mexiko und die Reintegration

  4. Carbon stocks in coffee agroforests and mixed dry tropical forests in the western highlands of Guatemala

    E-Print Network [OSTI]

    Evans, Tom

    of Guatemala Mikaela Schmitt-Harsh · Tom P. Evans · Edwin Castellanos · J. C. Randolph Received: 4 January 2012- ducted in 2007 and 2010 in the Lake Atitla´n region of Guatemala, this research examines the carbon pools Estudios Ambientales y de Biodiversidad, Universidad del Valle de Guatemala, 18 Avenida 11-95 Zona 15

  5. Frederico G. Antilln-Klussman Medical Director, Unidad Nacional de Oncologia Pediatrica, Guatemala

    E-Print Network [OSTI]

    Brent, Roger

    Frederico G. Antillón-Klussman Medical Director, Unidad Nacional de Oncologia Pediatrica, Guatemala, Pediatrica in Guatelmala. He obtained his Medical Doctor from the Universidad Francisco Marroquín, Guatemala of a treatment program for pediatric cancer in Guatemala. Dr. Antillon is a founder of the Association

  6. Land Tenure and Land Administration Issues in Guatemala Danielle Kelly Donovan

    E-Print Network [OSTI]

    Onsrud, Harlan J.

    Land Tenure and Land Administration Issues in Guatemala Danielle Kelly Donovan danielle.donovan@spatial.maine.edu May 2002 1. Abstract The evolution of land tenure in Guatemala is a mix of the native Mayan implementation stage, when the CIA began "Operation Success". The operation sent mercenaries into Guatemala

  7. MEMS Resonant Strain Sensor Integration

    E-Print Network [OSTI]

    Myers, David Richard

    2010-01-01

    Placzankis. Strap-down microelectromechanical MEMS sensorssensing system. Microelectromechanical Systems, Journal of,amplifier. Microelectromechanical Systems, Journal of, 6(4):

  8. MEMS technology for timing and frequency control

    E-Print Network [OSTI]

    Nguyen, CTC

    2007-01-01

    Y. Kim, “Noise in microelectromechanical system resonators,”regard, microelectromechanical systems (MEMS) technology,focus upon microelectromechanical systems (MEMS) and include

  9. (To discuss the dissemination of improved energy-efficient cookstoves in Guatemala, Guatemala City, Guatemala, June 5--7, 1989): Foreign trip report

    SciTech Connect (OSTI)

    Brown, M.A.

    1989-06-12

    Oak Ridge National Laboratory (ORNL) has a subcontract with Meso American Study Center on Appropriate Technology (CEMAT) to undertake a technology transfer project involving improved energy-efficient cookstoves in Guatemala. Meetings were held with Mr. Edgardo Caceres, Executive Director of CEMAT; with members of his staff; and CEMAT's subcontractor, Merca Plan, in order to assess the project's progress.

  10. Guatemala accelerates efforts to attract foreign E and D capital

    SciTech Connect (OSTI)

    NONE

    1997-01-20

    The Guatemalan government, headed by recently elected President Alvaro Arzu, has embarked on an ambitious program of petroleum exploration and development with the goal of producing 40,000 b/d by 2000. Production averaged 16,000 b/d last fall and was to be raised to 25,000 b/d by year end 1996. Oil and gas exploration began in Guatemala in the 1920s, but production is currently limited to two regions in the Peten basin in northeastern Guatemala. Officials at the Ministry of Energy and Mines aim to encourage comprehensive evaluation of the Peten basin as well as exploration of the Amatique basin in southeastern Guatemala and the Pacific basin on the country`s Pacific coast. The paper describes the Peten basin, the Amatique basin, the Pacific basin, bidding, and contract rules.

  11. An overview of the poultry industry of Guatemala 

    E-Print Network [OSTI]

    Braly Lopez, Esther Yvette

    1989-01-01

    was separated from his wife for three months while she was doing her research in Guatemala. hank you for encouraging me both psychologically and financially to finish my degree. I also appreciate the translations you did for me and the advice you gave. Your.... Rajan, yo r sense of humor and entertaining teaching style brought a bit of sunshine to my life when I really needed it. Special thanks goes to my in-laws in Guatemala: Sama Adriana Valdes, Papa Lionel Lopez?Byron and Carla Urrutia, Adrianita Lopez...

  12. MEM Lab Archived News: September 03, 2013

    E-Print Network [OSTI]

    MEM Lab Archived News: September 03, 2013 The MEM Lab is happy to welcome Lauren Costello, Natalie, and the MEM Lab is enthusiastic to have Paul Hill join us this fall! Look for Paul under the "People" page this week. Thanks for all your hard work and good luck this year Stephanie! June 01, 2013 The MEM Lab

  13. Titanium MEMS Technology Development for Drug Delivery and Microfluidic Applications

    E-Print Network [OSTI]

    Khandan, Omid

    2015-01-01

    The use of microelectromechanical systems (MEMS) technologyof microelectromechanical systems (MEMS) technology hasMEMS technology have emerged, and include biomedical microelectromechanical

  14. Polymer-Ceramic MEMS Bimorphs as Thermal Infrared Sensors

    E-Print Network [OSTI]

    Warren, Clinton Gregory

    2010-01-01

    the fabrication of the MEMS sensors from the readout system,mechanical infrared sensors based on MEMS polymer-ceramicmechanical infrared sensors based on MEMS polymer-ceramic

  15. Robust metal contact and capacitive mini-MEMS switches

    E-Print Network [OSTI]

    Sedaghat Pisheh, Hojr

    2013-01-01

    Mini-MEMS MechanicalSpring Constant, High Contact Force RF MEMS Switch 3.1First Generation of Miniature MEMS Capacitive Switch . . 4.3

  16. Knowledge-Based Evolutionary Linkage in MEMS Design Synthesis

    E-Print Network [OSTI]

    Cobb, Corie L.; Zhang, Ying; Agogino, Alice M.; Mangold, Jennifer

    2008-01-01

    interaction in evolving MEMS designs: microresonator caseof evolu- tionary MEMS resonators. In: Proc. of the IEEESéquin, C.H. : Hierarchical MEMS synthesis and optimization.

  17. MEMS multi-pole electromagnets: Compact electron optics and undulators

    E-Print Network [OSTI]

    Harrison, Jere Charles

    2014-01-01

    electron laser system using MEMS optics . . . . . . . . .power soft x-ray source based on a 400-µm period MEMS un-micrograph of a MEMS ‘racetrack’ transformer. . . . . . .

  18. Polymer-Ceramic MEMS Bimorphs as Thermal Infrared Sensors

    E-Print Network [OSTI]

    Warren, Clinton Gregory

    2010-01-01

    C. Vieider, and H. Jakobsen. MEMS-based uncooled infraredin uncooled infrared imaging: A MEMS perspective. Bell Labsstudies of an uncooled MEMS capacitive infrared detector for

  19. New Guatemala law tries to attract new explorers

    SciTech Connect (OSTI)

    Not Available

    1984-02-01

    With only 6,280 bopd of production and reserves of only 13 million barrels, Guatemala's 25,200 bpd thirst has forced the country to rewrite its petroleum law. Among pluses in the new law are full-cost recovery and prices based on world levels. However, the stiff royalty and no provision for neutral arbitration are significant minuses.

  20. MATHEMATICAL MODELING OF ELECTROSTATIC MEMS WITH TAILORED DIELECTRIC PROPERTIES

    E-Print Network [OSTI]

    Pelesko, John

    of electrostatically actuated MEMS devices. Key words. MEMS, microelectromechanical system, exact shooting, semilinear. The advent of microelectromechanical systems (MEMS) has revolutionized numerous branches of scienceMATHEMATICAL MODELING OF ELECTROSTATIC MEMS WITH TAILORED DIELECTRIC PROPERTIES JOHN A. PELESKO

  1. Piezoelectric MEMS for energy harvesting

    E-Print Network [OSTI]

    Kim, Sang-Gook

    Piezoelectric microelectromechanical systems (MEMS) have been proven to be an attractive technology for harvesting small magnitudes of energy from ambient vibrations. This technology promises to eliminate the need for ...

  2. Ovenized microelectromechanical system (MEMS) resonator

    DOE Patents [OSTI]

    Olsson, Roy H; Wojciechowski, Kenneth; Kim, Bongsang

    2014-03-11

    An ovenized micro-electro-mechanical system (MEMS) resonator including: a substantially thermally isolated mechanical resonator cavity; a mechanical oscillator coupled to the mechanical resonator cavity; and a heating element formed on the mechanical resonator cavity.

  3. MEMS & BioMEMS Chip-Scale Quadrupole Mass Filters for a Micro Gas Analyzer ...................................................................................................................MS.1

    E-Print Network [OSTI]

    Reif, Rafael

    MEMS & BioMEMS Chip-Scale Quadrupole Mass Filters for a Micro Gas Analyzer...................................................................................................................MS.2 MEMS-based Plasma Probes for Spacecraft Re-entry Monitoring.........................................................................MS.4 Direct Patterning of Metallic MEMS through Microcontact Printing

  4. BioMEMS DeviceBioMEMS Device Integration, PackagingIntegration, Packaging

    E-Print Network [OSTI]

    Rubloff, Gary W.

    BioMEMS DeviceBioMEMS Device Integration, PackagingIntegration, Packaging and Control forandMEMS Device Integration, Packaging andBioMEMS Device Integration, Packaging and Control for Bio Nonpermanent sealing provides ex situ, post-process analysis Reusable packaging components Microfluidic Control

  5. Cantilever MEMS Detection ofCantilever MEMS Detection of CancerCancer

    E-Print Network [OSTI]

    Petta, Jason

    Cantilever MEMS Detection ofCantilever MEMS Detection of CancerCancer O. Bravo, C. Milburn, W, NJ 08544 #12;OutlineOutline Introduction of bioMEMS AFM platform schematics Nanoindentations Vimentin antigen Graphs and data Clinical implications Future work #12;Introduction to BioMEMS Structure

  6. Microassembly of 3-D MEMS Structures Utilizing a MEMS Microgripper with a Robotic Manipulator

    E-Print Network [OSTI]

    Dechev, Nikolai

    Microassembly of 3-D MEMS Structures Utilizing a MEMS Microgripper with a Robotic Manipulator@mie.utoronto.ca, cleghrn@mie.utoronto.ca, mills@mie.utoronto.ca Abstract This paper describes the process of bonding a MEMS MEMS sub- components. The microgrippers bonded using the method described here are 1.5 mm by 0.6 mm

  7. Thermally actuated MEMS seal for vacuum applications

    E-Print Network [OSTI]

    Dighe, Aalap (Aalap Shirish)

    2011-01-01

    This thesis presents the design, fabrication and testing of a new, leak-free, permanently sealable MEMS valve for use in vacuum applications. This device is different from existing MEMS valves in that it is leak-free in ...

  8. Towards and industrial ecosystem for power MEMS

    E-Print Network [OSTI]

    Havel, Timothy Franklin

    2007-01-01

    This thesis is concerned with the commercial applications of MEMS (Micro-Electro-Mechanical Systems) manufacturing processes to advanced energy technologies. This field of engineering has come to be known as Power MEMS. ...

  9. RF MEMS switches : survey and analysis

    E-Print Network [OSTI]

    Machal-Cajigas, Antoinne Y

    2009-01-01

    Microelectromechanical systems known as MEMS, are an enabling technology that describe a field capable of creating very small electromechanical devices with feature sizes on the order of microns, or 10-6 meters. MEMS ...

  10. Lake Petn Itz, a 165 m deep lake in northern Guatemala, is the deepest lake in the lowlands of

    E-Print Network [OSTI]

    Gilli, Adrian

    Lake Petén Itzá, a 165 m deep lake in northern Guatemala, is the deepest lake in the lowlands. The cores were shipped from Guatemala in a refrigerated container and arrived safely at the National

  11. Unthinkable Rebellion and the Praxis of the Possible: Ch'orti' Campesin@ Struggles in Guatemala's Eastern Highlands

    E-Print Network [OSTI]

    Casolo, Jennifer Jean

    2011-01-01

    Santiago de Guatemala to the sparsely populated eastern countryside, especially along the Motagua riverSantiago de Guatemala, to the sparsely populated eastern countryside, especially along the Motagua River.

  12. MEMS technology for timing and frequency control

    E-Print Network [OSTI]

    Nguyen, CTC

    2007-01-01

    Y. Kim, “Noise in microelectromechanical system resonators,”capac- itively coupled microelectromechanical ?lters,” IEEEchip. In this regard, microelectromechanical systems (MEMS)

  13. Microelectromechanical (MEM) thermal actuator

    DOE Patents [OSTI]

    Garcia, Ernest J. (Albuquerque, NM); Fulcher, Clay W. G. (Sandia Park, NM)

    2012-07-31

    Microelectromechanical (MEM) buckling beam thermal actuators are disclosed wherein the buckling direction of a beam is constrained to a desired direction of actuation, which can be in-plane or out-of-plane with respect to a support substrate. The actuators comprise as-fabricated, linear beams of uniform cross section supported above the substrate by supports which rigidly attach a beam to the substrate. The beams can be heated by methods including the passage of an electrical current through them. The buckling direction of an initially straight beam upon heating and expansion is controlled by incorporating one or more directional constraints attached to the substrate and proximal to the mid-point of the beam. In the event that the beam initially buckles in an undesired direction, deformation of the beam induced by contact with a directional constraint generates an opposing force to re-direct the buckling beam into the desired direction. The displacement and force generated by the movement of the buckling beam can be harnessed to perform useful work, such as closing contacts in an electrical switch.

  14. Edinburgh Research Explorer Integrated Magnetic MEMS Relays

    E-Print Network [OSTI]

    Millar, Andrew J.

    Edinburgh Research Explorer Integrated Magnetic MEMS Relays Citation for published version: Schiavone, G, Desmulliez, MPY & Walton, AJ 2014, 'Integrated Magnetic MEMS Relays: Status of the Technology.mdpi.com/journal/micromachines Review Integrated Magnetic MEMS Relays: Status of the Technology Giuseppe Schiavone 1,2, *, Marc P. Y

  15. Compensation, Tuning, and Trimming of MEMS Resonators

    E-Print Network [OSTI]

    Ayazi, Farrokh

    Compensation, Tuning, and Trimming of MEMS Resonators Farrokh Ayazi, Roozbeh Tabrizian, Logan Sorenson Center for MEMS and Microsystems Technologies Georgia Institute of Technology Atlanta, GA, USA ayazi@gatech.edu Abstract--Fundamental characteristics of MEMS resonators such as acoustic velocity

  16. Microassembly Technologies for MEMS Michael B. Cohn

    E-Print Network [OSTI]

    Microassembly Technologies for MEMS Michael B. Cohn¤ , Karl F. Böhringer+ º, J. Mark Noworolski 94720-1774 ºUniversity of Washington, Dept. of EE, 234 EE/CSE Bldg., Seattle, WA 98195-2500 § MEMS to extend MEMS beyond the confines of silicon micromachining. This paper surveys research in both serial

  17. Evolutionary Synthesis of MEMS Raffi Roupen Kamalian

    E-Print Network [OSTI]

    Agogino, Alice M.

    Evolutionary Synthesis of MEMS by Raffi Roupen Kamalian B.S. (University of California, Berkeley Professor Albert P. Pisano Professor Kristofer S.J. Pister Fall 2004 #12;Evolutionary Synthesis of MEMS Evolutionary Synthesis of MEMS by Raffi Roupen Kamalian Doctor of Philosophy in Engineering - Mechanical

  18. Partial Differential Equations of Electrostatic MEMS

    E-Print Network [OSTI]

    Fournier, John J.F.

    Partial Differential Equations of Electrostatic MEMS by Yujin Guo B.Sc., China Three Gorges) The University of British Columbia July 2007 c Yujin Guo 2007 #12;Abstract Micro-Electromechanical Systems (MEMS their initial development in the 1980s, MEMS has revolutionized numerous branches of science and industry

  19. BROADBAND LOW ACTUATIONVOLTAGE RF'MEM SWITCHES

    E-Print Network [OSTI]

    Shen, Shyh-Chiang

    (RF) Microelectromechanical (MEM) switches have been thought of as one of the most attractive devicesBROADBAND LOW ACTUATIONVOLTAGE RF'MEM SWITCHES Shyh-ChiangShen,David Caruth, and Milton Feng of Illinois at Urbana-Champaign,IL61801-2355 ABSTRACT- We demonstrate a sub-lovolts RF MEM switch built

  20. Nutritional Assessment of the Elderly of San Pedro Ayampuc, Guatemala: Evaluation of Anthropometry, Biochemistry, and Helminthic Infection

    E-Print Network [OSTI]

    King, Jane E

    1991-01-01

    Guatemala: Evaluation of Anthropometry, Biochemistry, andMETHODS Census Anthropometry Blood samples/BiochemistryCensus . . . . . . . . .Anthropometry Biochemical values

  1. Relying on years of ethnographic research in highland Guatemala, this qualitative study explores domestic and family violence in a Maya

    E-Print Network [OSTI]

    Abstract Relying on years of ethnographic research in highland Guatemala, this qualitative study conducted with most living members of an extended family in two departments of western Guatemala, and ten and Research. She has conducted extensive research with Mayan peoples in Guatemala, exploring issues related

  2. Colonization, clear-cutting, and cornfields: Rural migration and deforestation in The Sierra de Lacandn National Park, Petn, Guatemala

    E-Print Network [OSTI]

    Lopez-Carr, David

    Lacandón National Park, Petén, Guatemala David L. Carr University of North Carolina at Chapel Hill. The research site is a settlement frontier within a protected area in northern Guatemala. The great expanse-poor colonists from other rural areas in Guatemala. Colonists arrived following the construction of a road

  3. Metamorphic reworking of a high pressurelow temperature mlange along the Motagua fault, Guatemala: A record of Neocomian and Maastrichtian

    E-Print Network [OSTI]

    Hemming, Sidney R

    Metamorphic reworking of a high pressure­low temperature mélange along the Motagua fault, Guatemala processes oblique collisional tectonics The Guatemala suture zone is a major east­west left-lateral strike slip boundary that separates the North American and Caribbean plates in Guatemala. The Motagua fault

  4. RURAL-FRONTIER MIGRATION AND DEFORESTATION IN THE SIERRA DE LACANDON NATIONAL PARK, GUATEMALA

    E-Print Network [OSTI]

    Lopez-Carr, David

    RURAL-FRONTIER MIGRATION AND DEFORESTATION IN THE SIERRA DE LACANDON NATIONAL PARK, GUATEMALA-frontier Migration and Deforestation in the Sierra de Lacandón National Park, Guatemala (Under the direction of Thomas M. Whitmore.) This dissertation explores the primary proximate and underlying causes

  5. Migration to the Maya Biosphere Reserve, Guatemala: Why place matters David L. Carr

    E-Print Network [OSTI]

    Lopez-Carr, David

    1 Migration to the Maya Biosphere Reserve, Guatemala: Why place matters David L. Carr Assistant-4060 Paper submitted to Human Organization Please do not cite without permission of the author Migration to the Maya Biosphere Reserve, Guatemala: Why place matters Abstract Virtually all migration research examines

  6. Inertial measurement unit using rotatable MEMS sensors

    DOE Patents [OSTI]

    Kohler, Stewart M. (Albuquerque, NM); Allen, James J. (Albuquerque, NM)

    2007-05-01

    A MEM inertial sensor (e.g. accelerometer, gyroscope) having integral rotational means for providing static and dynamic bias compensation is disclosed. A bias compensated MEM inertial sensor is described comprising a MEM inertial sense element disposed on a rotatable MEM stage. A MEM actuator drives the rotation of the stage between at least two predetermined rotational positions. Measuring and comparing the output of the MEM inertial sensor in the at least two rotational positions allows for both static and dynamic bias compensation in inertial calculations based on the sensor's output. An inertial measurement unit (IMU) comprising a plurality of independently rotatable MEM inertial sensors and methods for making bias compensated inertial measurements are disclosed.

  7. Inertial measurement unit using rotatable MEMS sensors

    DOE Patents [OSTI]

    Kohler, Stewart M.; Allen, James J.

    2006-06-27

    A MEM inertial sensor (e.g. accelerometer, gyroscope) having integral rotational means for providing static and dynamic bias compensation is disclosed. A bias compensated MEM inertial sensor is described comprising a MEM inertial sense element disposed on a rotatable MEM stage. A MEM actuator for drives the rotation of the stage between at least two predetermined rotational positions. Measuring and comparing the output of the MEM inertial sensor in the at least two rotational positions allows, for both static and dynamic bias compensation in inertial calculations based on the sensor's output. An inertial measurement unit (IMU) comprising a plurality of independently rotatable MEM inertial sensors and methods for making bias compensated inertial measurements are disclosed.

  8. W-Coating for MEMS

    SciTech Connect (OSTI)

    Fleming, J.G.; Mani, S.S.; Sniegowski, J.J.

    1999-07-08

    The integration of miniaturized mechanical components has spawned a new technology known as microelectromechanical systems (MEMS). Surface micromachining, defined as the fabrication of micromechanical structures from deposited thin films, is one of the core technological processes underlying MEMS. Surface micromachined structures have a large ratio of surface area to volume which makes them particularly vulnerable to adhesion to the substrate or adjacent structures during release or in use--a problem is called stiction. Since microactuators can have surfaces in normal or sliding contact, function and wear are critical issues for reliable operation of MEMS devices. Surface modifications are needed to reduce adhesion and friction in micromechanical structures. In this paper, we will present a process used to selectively coat MEMS devices with Tungsten using a CVD (Chemical Vapor Deposition) process. We will discuss the effect of wet and vapor phase cleans along with different process variables. Endurance of the W coating is important, especially in applications where wear due to repetitive contacts with the film may occur. Further, tungsten is hard and chemically inert, Tungsten CVD is used in the integrated-circuit industry, which makes this, approach manufacturable.

  9. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    stiction coatings for MEMS,” Sensors and Actuators A, vol.E. Jackson, “A Novel MEMS Pressure Sensor Fabricated on anIC package and (b) a MEMS pressure sensor package. [21] .

  10. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    2, pp. 124-126, 1987. H. Fujita, “A Decade of MEMS and ItsFuture,” IEEE MEMS Conference Proceedings, pp. 1-8, 1997. K.in the Packaging of MEMS,” International Symposium on

  11. Titanium MEMS Technology Development for Drug Delivery and Microfluidic Applications

    E-Print Network [OSTI]

    Khandan, Omid

    2015-01-01

    Etching of Bulk Titanium for MEMS Applications. ” Journal ofMeng. 2012. “An Implantable MEMS Micropump System for Drugand Ellis Meng. 2009. “A Passive MEMS Drug Delivery Pump for

  12. Trajectory-switching algorithm for a MEMS gyroscope

    E-Print Network [OSTI]

    Park, Sungsu; Horowitz, Roberto; Hong, Sung Kyung; Nam, Yoonsu

    2007-01-01

    mode of operation of MEMS gyroscope,” J. Microelectromech.SWITCHING ALGORITHM FOR A MEMS GYROSCOPE [5] S. Chang, M.design data of the MIT-SOI MEMS gyroscope was conducted to

  13. MEMS Lens Scanners for Free-Space Optical Interconnects

    E-Print Network [OSTI]

    Chou, Jeffrey Brian

    2011-01-01

    Chen, and P. -Z. Chang, “A MEMS micromirror fabricated usingand M. R. Douglass, “A MEMS-based projection display,”L. . Law, and A. Goldenberg, “MEMS optical switches,” IEEE

  14. High-Q Low-Impedance MEMS Resonators

    E-Print Network [OSTI]

    Hung, Li-Wen

    2011-01-01

    Digest. , 17 th IEEE Int. MEMS Conf. , pp. 821-824, 2004. [Digest. , 17th IEEE Int. MEMS Conf. , pp. 821-824, 2004 [2]Digest, 17 th IEEE Int. MEMS Conf. , 2004, pp. 641-644. [15

  15. Improving Evolutionary Synthesis of MEMS through Fabrication and Testing Feedback

    E-Print Network [OSTI]

    Agogino, Alice M.

    Improving Evolutionary Synthesis of MEMS through Fabrication and Testing Feedback Raffi Kamalian a microelectromechanical system (MEMS) synthesis characterization study, four modifications to the objectives: MEMS, genetic algorithms, resonator design, evolutionary computer-aided design, validation. 1

  16. Amorphous Diamond MEMS and Sensors

    SciTech Connect (OSTI)

    SULLIVAN, JOHN P.; FRIEDMANN, THOMAS A.; ASHBY, CAROL I.; DE BOER, MAARTEN P.; SCHUBERT, W. KENT; SHUL, RANDY J.; HOHLFELDER, ROBERT J.; LAVAN, D.A.

    2002-06-01

    This report describes a new microsystems technology for the creation of microsensors and microelectromechanical systems (MEMS) using stress-free amorphous diamond (aD) films. Stress-free aD is a new material that has mechanical properties close to that of crystalline diamond, and the material is particularly promising for the development of high sensitivity microsensors and rugged and reliable MEMS. Some of the unique properties of aD include the ability to easily tailor film stress from compressive to slightly tensile, hardness and stiffness 80-90% that of crystalline diamond, very high wear resistance, a hydrophobic surface, extreme chemical inertness, chemical compatibility with silicon, controllable electrical conductivity from insulating to conducting, and biocompatibility. A variety of MEMS structures were fabricated from this material and evaluated. These structures included electrostatically-actuated comb drives, micro-tensile test structures, singly- and doubly-clamped beams, and friction and wear test structures. It was found that surface micromachined MEMS could be fabricated in this material easily and that the hydrophobic surface of the film enabled the release of structures without the need for special drying procedures or the use of applied hydrophobic coatings. Measurements using these structures revealed that aD has a Young's modulus of {approx}650 GPa, a tensile fracture strength of 8 GPa, and a fracture toughness of 8 MPa{center_dot}m {sup 1/2}. These results suggest that this material may be suitable in applications where stiction or wear is an issue. Flexural plate wave (FPW) microsensors were also fabricated from aD. These devices use membranes of aD as thin as {approx}100 nm. The performance of the aD FPW sensors was evaluated for the detection of volatile organic compounds using ethyl cellulose as the sensor coating. For comparable membrane thicknesses, the aD sensors showed better performance than silicon nitride based sensors. Greater than one order of magnitude increase in chemical sensitivity is expected through the use of ultra-thin aD membranes in the FPW sensor. The discoveries and development of the aD microsystems technology that were made in this project have led to new research projects in the areas of aD bioMEMS and aD radio frequency MEMS.

  17. Improved Design of Optical MEMS Using the SUMMiT Fabrication Process

    SciTech Connect (OSTI)

    Michalicek, M.A.; Comtois, J.H.; Barron, C.C.

    1997-12-31

    This paper describes the design and fabrication of optical Microelectromechanical Systems (MEMS) devices using the Sandia Ultra planar Multilevel MEMS Technology (SUMMiT) fabrication process. This state of the art process, offered by Sandia National Laboratories, provides unique and very advantageous features which make it ideal for optical devices. This enabling process permits the development of micromirror devices with near ideal characteristics which have previously been unrealizable in standard polysilicon processes. This paper describes such characteristics as elevated address electrodes, individual address wiring beneath the device, planarized mirror surfaces, unique post-process metallization, and the best active surface area to date.

  18. SDSU MEMS Cleanroom Instructions Page 1 of 2 SDSU MEMS Lab., Department of Mechanical Engineering

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    SDSU ­ MEMS Cleanroom Instructions Page 1 of 2 SDSU MEMS Lab., Department of Mechanical Engineering time in the login ledger. 3. Maintain a journal and a personal (labeled) cleanroom box 4. Make sure you to the Cleanroom Folder & MEMS Lab folder. 3. Also please get permission from Dr. Sam Kassegne & the Cleanroom

  19. Research Projects inResearch Projects in Microelectromechanical Systems (MEMS) andMicroelectromechanical Systems (MEMS) and

    E-Print Network [OSTI]

    Frechette, Luc G.

    Research Projects inResearch Projects in Microelectromechanical Systems (MEMS) andMicroelectromechanical Systems (MEMS) and MicrofluidicsMicrofluidics Luc G. Fréchette, Ph.D. Associate Professor Canada Research Chair in Microfluidics and Power MEMS Department of Mechanical Engineering Université de Sherbrooke

  20. Results of geothermal gradient core hole TCB-1, Tecuamburro volcano geothermal site, Guatemala, Central America

    SciTech Connect (OSTI)

    Adams, A.I.; Chipera, S.; Counce, D.; Gardner, J.; Goff, S.; Goff, F.; Heiken, G.; Laughlin, A.W.; Musgrave, J.; Trujillo, P.E. Jr. (Los Alamos National Lab., NM (United States)); Aycinena, S.; Martinelli, L. (Swissboring Overseas Corp. Ltd., Guatemala City (Guatemala)); Castaneda, O.; Revolorio, M.; Roldan, A. (Unidad de Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion); D

    1992-02-01

    Results of geological, volcanological, hydrogeochemical, and geophysical field studies conducted in 1988 and 1989 at the Tecuamburro volcano geothermal site in Guatemala indicated that there is a substantial shallow heat source beneath the area of youngest volcanism. To obtain information on subsurface temperatures and temperature gradients, stratigraphy, hydrothermal alteration, fracturing, and possible inflows of hydrothermal fluids, a geothermal gradient core hole (TCB-1) was drilled to 808 m low on the northern flank of the Tecuamburro volcano Complex, 300 km south of a 300-m-diameter phreatic crater, Laguna Ixpaco, dated at 2,910 years. Gases from acid-sulfate springs near Laguna Ixpaco consistently yield maximum estimated subsurface temperatures of 250--300{degrees}C. The temperature versus depth curve from TCB-1 does not show isothermal conditions and the calculated thermal gradients from 500--800 m is 230{degrees}C/km. Bottom hole temperature is 238{degrees}C. Calculated heat flow values are nearly 9 heat flow units (HFU). The integration of results from the TCB-1 gradient core hole with results from field studies provides strong evidence that the Tecuamburro area holds great promise for containing a commercial geothermal resource.

  1. Tecuamburro Volcano, Guatemala geothermal gradient core hole drilling, operations, and preliminary results

    SciTech Connect (OSTI)

    Goff, S.; Heiken, G.; Goff, F.; Gardner, J. (Los Alamos National Lab., NM (USA)); Duffield, W. (Geological Survey, Flagstaff, AZ (USA)); Martinelli, L.; Aycinena, S. (Swissboring Overseas Corp. Ltd., Guatemala City (Guatemala)); Castaneda, O. (Unidad de Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion)

    1990-01-01

    A geothermal gradient core hole (TCB-1) was drilled to a depth of 700+ m at the Tecuamburro geothermal site, Guatemala during February and March, 1990. The core hole is located low on the northern flank of the Tecuamburro Volcano complex. Preliminary analysis of cores (>98% core recovery) indicates that the hydrothermal system may be centered in the 4-km-diameter Chupadero Crater, which has been proposed as the source of pyroxene pumice deposits in the Tecuamburro area. TCB-1 is located 300 m south of a 300-m-diameter phreatic crater, Laguna Ixpaco; the core hole penetrates the thin edge of a tuff ring surrounding Ixpaco and zones of hydrothermal brecciation within the upper 150 m may be related to the phreatic blast, dated at 2,910 {sup 14}C years. At the time of this writing, the unequilibrated temperature at a depth of 570m was 180{degree}C. Data on fracturing, permeability, hydrothermal alteration, and temperature will be presented. 3 refs., 3 figs.

  2. Transverse extension of Guatemala active margin: implications for accretion

    SciTech Connect (OSTI)

    McMillen, K.J.

    1987-05-01

    The inner trench wall of the Middle America Trench off Guatemala does not show evidence of accretion, based on DSDP Legs 67 and 84. The presence of normal faults on the lower inner trench slope has resulted in various subsidence models for the margin. Fault traces would be expected to trend parallel to the margin (northwest-southeast) if margin subsidence had occurred. Instead, the faults trend north-south and occur in groups of faults downdropped to the east and to the west. The faults do not seem to be related to margin subsidence but rather to previously proposed Cenozoic Central American rifting. The rifting resulted from crustal bending as the Central American block rounded southern Mexico during differential North American/Caribbean plate motion. The rifts, which extend nearly to the trench axis, underlie the San Jose submarine canyon and align with the Guatemala City graben. Possible east-west accommodation zones, between fault zones that dip in opposite directions, exist near the shelf edge. These accommodation zones may have formed along lines of weakness where oceanic crust was previously emplaced into the margin during or prior to the Eocene. These rifts show that compressional and extension features can occur simultaneously with underthrusting on active margins.

  3. MEMS packaging efforts at Sandia National Laboratories.

    SciTech Connect (OSTI)

    Custer, Jonathan Sloane

    2003-02-01

    Sandia National Laboratories has programs covering a broad range of MEMS technologies from LIGA to bulk to surface micromachining. These MEMS technologies are being considered for an equally broad range of applications, including sensors, actuators, optics, and microfluidics. As these technologies have moved from the research to the prototype product stage, packaging has been required to develop new capabilities to integrated MEMS and other technologies into functional microsystems. This paper discusses several of Sandia's MEMS packaging efforts, focusing mainly on inserting Sandia's SUMMIT V (5-level polysilicon) surface micromachining technology into fieldable microsystems.

  4. Failure analysis issues in microelectromechanical systems (MEMS...

    Office of Scientific and Technical Information (OSTI)

    Conference: Failure analysis issues in microelectromechanical systems (MEMS). Citation Details In-Document Search Title: Failure analysis issues in microelectromechanical systems...

  5. MEMS multi-pole electromagnets: Compact electron optics and undulators

    E-Print Network [OSTI]

    Harrison, Jere Charles

    2014-01-01

    laser system using MEMS optics . . . . . . . . . Heatattempt at MEMS undulators and focusing optics. . . . . .all published quadrupole optics by more than an order of

  6. Trajectory-switching algorithm for a MEMS gyroscope

    E-Print Network [OSTI]

    Park, Sungsu; Horowitz, Roberto; Hong, Sung Kyung; Nam, Yoonsu

    2007-01-01

    control for a microelectromechanical-system z-axis gyroscoperoscope, microelectromechanical systems (MEMS), trajectoryI NTRODUCTION OST microelectromechanical-system (MEMS) gyro-

  7. Trajectory-switching algorithm for a MEMS gyroscope

    E-Print Network [OSTI]

    Park, Sungsu; Horowitz, Roberto; Hong, Sung Kyung; Nam, Yoonsu

    2007-01-01

    control for a microelectromechanical-system z-axis gyroscopecontrol, gy- roscope, microelectromechanical systems (MEMS),I NTRODUCTION OST microelectromechanical-system (MEMS) gyro-

  8. Addressing mechanical reliability issues in Sandia MEMS devices...

    Office of Scientific and Technical Information (OSTI)

    Addressing mechanical reliability issues in Sandia MEMS devices. Citation Details In-Document Search Title: Addressing mechanical reliability issues in Sandia MEMS devices. No...

  9. MEMS-based chemical analysis systems development at Sandia National...

    Office of Scientific and Technical Information (OSTI)

    Conference: MEMS-based chemical analysis systems development at Sandia National Labs. Citation Details In-Document Search Title: MEMS-based chemical analysis systems development at...

  10. MEMS-based Speckle Spectrometer

    E-Print Network [OSTI]

    A. I. Sheinis; L. Nigra; M. Q. Kuhlen

    2006-06-07

    We describe a new concept for a MEMS-based active spatial filter for astronomical spectroscopy. The goal of this device is to allow the use of a diffraction-limited spectrometer on a seeing limited observation at improved throughput over a comparable seeing-limited spectrometer, thus reducing the size and cost of the spectrometer by a factor proportional to r0/D (For the case of a 10 meter telescope this size reduction will be approximately a factor of 25 to 50). We use a fiber-based integral field unit (IFU) that incorporates an active MEMS mirror array to feed an astronomical spectrograph. A fast camera is used in parallel to sense speckle images at a spatial resolution of lambda/D and at a temporal frequency greater than that of atmospheric fluctuations. The MEMS mirror-array is used as an active shutter to feed speckle images above a preset intensity threshold to the spectrometer, thereby increasing the signal-to-noise ratio (SNR) of the spectrogram. Preliminary calculations suggests an SNR improvement of a factor of about 1.4. Computer simulations have shown an SNR improvement of 1.1, but have not yet fully explored the parameter space.

  11. Challenges in the Packaging of MEMS

    SciTech Connect (OSTI)

    Malshe, A.P.; Singh, S.B.; Eaton, W.P.; O'Neal, C.; Brown, W.D.; Miller, W.M.

    1999-03-26

    The packaging of Micro-Electro-Mechanical Systems (MEMS) is a field of great importance to anyone using or manufacturing sensors, consumer products, or military applications. Currently much work has been done in the design and fabrication of MEMS devices but insufficient research and few publications have been completed on the packaging of these devices. This is despite the fact that packaging is a very large percentage of the total cost of MEMS devices. The main difference between IC packaging and MEMS packaging is that MEMS packaging is almost always application specific and greatly affected by its environment and packaging techniques such as die handling, die attach processes, and lid sealing. Many of these aspects are directly related to the materials used in the packaging processes. MEMS devices that are functional in wafer form can be rendered inoperable after packaging. MEMS dies must be handled only from the chip sides so features on the top surface are not damaged. This eliminates most current die pick-and-place fixtures. Die attach materials are key to MEMS packaging. Using hard die attach solders can create high stresses in the MEMS devices, which can affect their operation greatly. Low-stress epoxies can be high-outgassing, which can also affect device performance. Also, a low modulus die attach can allow the die to move during ultrasonic wirebonding resulting to low wirebond strength. Another source of residual stress is the lid sealing process. Most MEMS based sensors and devices require a hermetically sealed package. This can be done by parallel seam welding the package lid, but at the cost of further induced stress on the die. Another issue of MEMS packaging is the media compatibility of the packaged device. MEMS unlike ICS often interface with their environment, which could be high pressure or corrosive. The main conclusion we can draw about MEMS packaging is that the package affects the performance and reliability of the MEMS devices. There is a gross lack of understanding between the package materials, induced stress, and the device performance. The material properties of these packaging materials are not well defined or understood. Modeling of these materials and processes is far from maturity. Current post-package yields are too low for commercial feasibility, and consumer operating environment reliability and compatibility are often difficult to simulate. With further understanding of the materials properties and behavior of the packaging materials, MEMS applications can be fully realized and integrated into countless commercial and military applications.

  12. Creating the political spectacle during the Cold War: Guatemala and the United States 

    E-Print Network [OSTI]

    Burton, Michael Cassidy

    2013-02-22

    . The objective of this research is to show how the interaction between the United States and Guatemala during President Arbenz's tenure in power is a good example of Edleman's political spectacle. Depending on how US policymakers interpreted Arbenz's policy...

  13. Sumatran rice and miracle herbs: Local and international natural knowledge in late-colonial Guatemala

    E-Print Network [OSTI]

    Brockmann, Sophie

    2014-01-01

    themselves to bringing ‘Enlightenment’ and ‘improvement’ to the region through natural history and other ‘useful arts’. Articles published in the Economic Society’s newspaper, the Gazeta de Guatemala, show that a socially and geographically wider network...

  14. The macroeconomic module of the Energy Policy Evaluation Model of Guatemala

    SciTech Connect (OSTI)

    Booth, S.R. (Los Alamos National Lab., NM (USA)); Cancino, R. (Direccion General de Planificacion y Desarrollo Energetico, Guatemala City (Guatemala))

    1991-08-01

    This report describes the methodology and results of the macroeconomic module of the Energy Policy Evaluation Model of Guatemala (MEPEG). This effort was conducted jointly by the Ministry of Energy and Mines of Guatemala and Los Alamos National Laboratory under the Central American Energy and Resources Project of Los Alamos, funded by the US Agency for International Development. The data, theory, empirical specification, and simulation results of the macroeconomic module are described. 10 refs., 2 figs., 6 tabs.

  15. Electrical power systems (Guatemala). Electric power generation and distribution equipment, March 1991. Export trade information

    SciTech Connect (OSTI)

    Not Available

    1991-03-01

    The article analyzes the electrical power generation and distribution equipment market in Guatemala and contains the following subtopics: market assessment, competitive situation, market access, trade promotion opportunities, best sales prospects, and statistical data. The total market demand of electrical power generation and distribution equipment and materials in Guatemala increased from US $19.0 million in 1987 to $24.8 million in 1988 (30.5 percent).

  16. Frictional characteristics of serpentinite from the Motagua fault zone in Guatemala: an experimental study 

    E-Print Network [OSTI]

    Dengo, Carlos Arturo

    1978-01-01

    , suggestions, and criticisms, all of which in proved the content: of this thesis. !!ith much pleasure I thank the patient guidance and conversations provided by my Father, Dr. Gabriel Dengo (ICAITI, Guatemala!. He in- traduced me to the many problems...-Textured Serpentinites Compositions of Serpentinite Summary of Implications of Serpentinite to the Ear th- quake Problem . 58 78 LIST OF FIGURES FIGURE PAGE Location map showing the serpentinite outcrops in Guatemala (in black) and the major st. rike...

  17. Guatemala switch to crude saves over $1 million a month

    SciTech Connect (OSTI)

    de Biasi, V.

    1980-03-01

    In a two-step program designed to reduce fuel costs and improve operating efficiency, Empresa Electrica de Guatemala has modified two General Electric PG 5341 gas turbines at Laguna to run on crude oil and installed heat recovery equipment for repowering two existing steam turbines. The gas turbines, nominally rated at around 19,000 kW for base load operation at 70/sup 0/F average ambient temperature and 4000 feet altitude, were installed in 1977-78 as a base load backup to hydro power during the dry season. Original plan was to put them into immediate service as simple cycle units and then convert to combined cycle operation. Priorities were shifted to switch over from distillate to crude oil firing before going ahead with the combined cycle istallation. Their economic evaluation showed the initial investment would be paid off in a few months by the savings in fuel costs.

  18. Inductively Coupled Plasma Etching of Bulk Titanium for MEMS Applications

    E-Print Network [OSTI]

    MacDonald, Noel C.

    Inductively Coupled Plasma Etching of Bulk Titanium for MEMS Applications E. R. Parker,a, * B. J for the bulk micromachining of microelectromechanical MEMS devices. Titanium- based MEMS have the potential for the microfabrication of titanium-based MEMS devices. © 2005 The Electrochemical Society. DOI: 10.1149/1.2006647 All

  19. Structured Custom Design of MEMS Devices Dr. Debjyoti Banerjee

    E-Print Network [OSTI]

    Banerjee, Debjyoti

    Structured Custom Design of MEMS Devices Dr. Debjyoti Banerjee Senior Consulting Engineer COVENTOR, Macro-model, Netlist, MEMS, CAD. ABSTRACT A top down design is essential to minimize time-to-market of MEMS devices. A structured custom design approach for MEMS design based on the concept of using

  20. Asymptotics of Nonlinear Biharmonic Eigenvalue Problems of MEMS

    E-Print Network [OSTI]

    Ward, Michael Jeffrey

    Asymptotics of Nonlinear Biharmonic Eigenvalue Problems of MEMS Alan E. Lindsay and Michael J. Ward Problems of MEMS Overview of Nonlinear Eigenvalue Problems of MEMS Calculation of the Pull-In Voltage of the Maximal Solution Branch. Of more mathematical interest in PDE. CAIMS ­ p. #12;A MEMS Capacitor d L

  1. MEMS Research Lab, EL-104 College of Engineering

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    MEMS Research Lab, EL-104 College of Engineering 5500 Campanile Drive, San Diego CA 92182-1323 Tel: 619-594-1815 Fax: 619-594-3599 SDSU MEMS CLEANROOM CERTIFICATION PROGRAM Every new student with intention to work in SDSU MEMS cleanroom facility has to complete the SDSU MEMS Lithography certification

  2. Predictive modeling of thermoelastic energy dissipation in tunable MEMS mirrors

    E-Print Network [OSTI]

    Yi, Yun-Bo

    Predictive modeling of thermoelastic energy dissipation in tunable MEMS mirrors Houwen Tang is of significant importance in many microelectromechanical sys- tem MEMS applications. Thermoelastic damping can such as MEMS mirrors. We deal with the simulation and analysis of thermoelastic damping of MEMS mirrors based

  3. Development of MEMS photoacoustic spectroscopy

    SciTech Connect (OSTI)

    Robinson, Alex Lockwood; Eichenfield, Matthew S.; Griffin, Benjamin; Harvey, Heidi Alyssa; Nielson, Gregory N.; Okandan, Murat; Langlois, Eric; Resnick, Paul James; Shaw, Michael J.; Young, Ian; Givler, Richard C.; Reinke, Charles M.

    2014-01-01

    After years in the field, many materials suffer degradation, off-gassing, and chemical changes causing build-up of measurable chemical atmospheres. Stand-alone embedded chemical sensors are typically limited in specificity, require electrical lines, and/or calibration drift makes data reliability questionable. Along with size, these "Achilles' heels" have prevented incorporation of gas sensing into sealed, hazardous locations which would highly benefit from in-situ analysis. We report on development of an all-optical, mid-IR, fiber-optic based MEMS Photoacoustic Spectroscopy solution to address these limitations. Concurrent modeling and computational simulation are used to guide hardware design and implementation.

  4. MEMS Materials and Temperature Sensors for Down Hole Geothermal System Monitoring

    E-Print Network [OSTI]

    Wodin-Schwartz, Sarah

    2013-01-01

    In-Plane MEMS Temperature SensorExisting MEMS Capacitive Temperature Sensors . . . . .suite of encapsulated MEMS sensors to monitor the down hole

  5. MEMS-based Massively-parallelized Mechanoporation Instrumentation for Ultrahigh Throughput Cellular Manipulation

    E-Print Network [OSTI]

    Zhang, Yanyan

    2012-01-01

    OF CALIFORNIA RIVERSIDE MEMS-based Massively-parallelizedOF THE DISSERTATION MEMS-based Massively-parallelizeda massively- parallelized MEMS-based platform for passively

  6. High performance RF MEMS metal-contact switches and switching networks

    E-Print Network [OSTI]

    Patel, Chirag D.; Patel, Chirag D.

    2012-01-01

    MEMS switches for RF applications,” MicroelectromechanicalMEMS switch with a corrugated diaphragm,” MicroelectromechanicalMEMS switch technology for high frequency applications,” in Microelectromechanical

  7. Fatigue of polycrystalline silicon for MEMS applications: Crack growth and stability under resonant loading conditions

    E-Print Network [OSTI]

    Muhlstein, C.L.; Howe, R.T.; Ritchie, R.O.

    2001-01-01

    Science of Microelectromechanical System (MEMS) Devices III.Science of Microelectromechanical System (MEMS) Devices III.2001) and microelectromechanical systems (MEMS), there has

  8. Micro electromechanical systems (MEMS) for mechanical engineers

    SciTech Connect (OSTI)

    Lee, A. P., LLNL

    1996-11-18

    The ongoing advances in Microelectromechanical Systems (MEMS) are providing man-kind the freedom to travel to dimensional spaces never before conceivable. Advances include new fabrication processes, new materials, tailored modeling tools, new fabrication machines, systems integration, and more detailed studies of physics and surface chemistry as applied to the micro scale. In the ten years since its inauguration, MEMS technology is penetrating industries of automobile, healthcare, biotechnology, sports/entertainment, measurement systems, data storage, photonics/optics, computer, aerospace, precision instruments/robotics, and environment monitoring. It is projected that by the turn of the century, MEMS will impact every individual in the industrial world, totaling sales up to $14 billion (source: System Planning Corp.). MEMS programs in major universities have spawned up all over the United States, preparing the brain-power and expertise for the next wave of MEMS breakthroughs. It should be pointed out that although MEMS has been initiated by electrical engineering researchers through the involvement of IC fabrication techniques, today it has evolved such that it requires a totally multi-disciplinary team to develop useful devices. Mechanical engineers are especially crucial to the success of MEMS development, since 90% of the physical realm involved is mechanical. Mechanical engineers are needed for the design of MEMS, the analysis of the mechanical system, the design of testing apparatus, the implementation of analytical tools, and the packaging process. Every single aspect of mechanical engineering is being utilized in the MEMS field today, however, the impact could be more substantial if more mechanical engineers are involved in the systems level designing. In this paper, an attempt is made to create the pathways for a mechanical engineer to enter in the MEMS field. Examples of application in optics and medical devices will be used to illustrate how mechanical engineers made impact. Through a basic understanding of the history of MEMS, the background physics and scaling in micromechanical systems, and an introduction to baseline MEMS processes, a mechanical engineer should be well on his way to Alice's wonderland in the ever-exciting playground of MEMS.

  9. 2/24/2014 2014/02/23 MEMS @

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    2/24/2014 2014/02/23 MEMS @ :: PIXNET :: http://spiderman186.pixnet.net/blog/post/103451560 1/3 Feb 23 Sun 2014 23:23 2014/02/23 MEMS 10Like 10 people like this. Sign Up to see what your friends like.Like micro-windmillsMEMS10 JC Chiao100 WinMEMS " " 1.8mm MEMS : BLOG 41 509893 (1) (18

  10. A Comparative Analysis of Mestizo and Indigenous Mayan Young Women in Guatemala: Attitudes and Knowledge of Sexual Reproduction and Health among Members of Children International's Youth Health Corps

    E-Print Network [OSTI]

    Trapp, Sarah Casement

    2011-04-21

    youth in Guatemala participate in the program together. In this comparative analysis of Kaqchikel Maya young women and non–indigenous young women in Guatemala, a written anonymous survey was administered to both groups of female participants to determine...

  11. MEMS reliability in shock environments

    SciTech Connect (OSTI)

    TANNER,DANELLE M.; WALRAVEN,JEREMY A.; HELGESEN,KAREN SUE; IRWIN,LLOYD W.; BROWN,FREDERICK A.; SMITH,NORMAN F.; MASTERS,NATHAN

    2000-02-09

    In order to determine the susceptibility of the MEMS (MicroElectroMechanical Systems) devices to shock, tests were performed using haversine shock pulses with widths of 1 to 0.2 ms in the range from 500g to 40,000g. The authors chose a surface-micromachined microengine because it has all the components needed for evaluation: springs that flex, gears that are anchored, and clamps and spring stops to maintain alignment. The microengines, which were unpowered for the tests, performed quite well at most shock levels with a majority functioning after the impact. Debris from the die edges moved at levels greater than 4,000g causing shorts in the actuators and posing reliability concerns. The coupling agent used to prevent stiction in the MEMS release weakened the die-attach bond, which produced failures at 10,000g and above. At 20,000g the authors began to observe structural damage in some of the thin flexures and 2.5-micron diameter pin joints. The authors observed electrical failures caused by the movement of debris. Additionally, they observed a new failure mode where stationary comb fingers contact the ground plane resulting in electrical shorts. These new failure were observed in the control group indicating that they were not shock related.

  12. Design of Surface Micromachined Compliant MEMS

    SciTech Connect (OSTI)

    Joe Anthony Bradley

    2002-12-31

    The consideration of compliant mechanisms as Microelectromechanical Systems (MEMS) is the focus of this research endeavor. MEMS are micron to millimeter devices that combine electrical, mechanical, and information processing capabilities on the same device. These MEMS need some mechanical motion or parts that move relative to each other. This relative motion, using multiple parts, is not desired because of the assembly requirement and the friction introduced. Compliant devices limits or eliminates friction and the need for multi-component assembly. Compliant devices improve designs by creating single piece mechanisms. The purpose of this research is to validate surface micromachining as a viable fabrication process for compliant MEMS designs. Specifically, this research has sought to fabricate a micro-compliant gripper and a micro-compliant clamp to illustrate the process. While other researchers have created compliant MEMs, most have used comb-drive actuation methods and bulk micromachining processes. This research focused on fully-compliant devices that use device flexibility for motion and actuation. Validation of these compliant MEMS is achieved by structural optimization of device design and functional performance testing. This research contributes to the ongoing research in MEMS by evaluating the potential of using surface micromachining as a process for fabricating compliant micro-mechanisms.

  13. Design of Surface micromachined Compliant MEMS

    SciTech Connect (OSTI)

    Joe Anthony Bradley

    2002-08-01

    The consideration of compliant mechanisms as Microelectromechanical Systems (MEMS) is the focus of this research endeavor. MEMS are micron to millimeter devices that combine electrical, mechanical, and information processing capabilities on the same device. These MEMS need some mechanical motion or parts that move relative to each other. This relative motion, using multiple parts, is not desired because of the assembly requirement and the friction introduced. Compliant devices limits or eliminates friction and the need for multi-component assembly. Compliant devices improve designs by creating single piece mechanisms. The purpose of this research is to validate surface micromachining as a viable fabrication process for compliant MEMS designs. Specifically, this research has sought to fabricate a micro-compliant gripper and a micro-compliant clamp to illustrate the process. While other researchers have created compliant MEMS, most have used comb-drive actuation methods and bulk micromachining processes. This research focuses on fully-compliant devices that use device flexibility for motion and actuation. Validation of these compliant MEMS is achieved by structural optimization of device design and functional performance testing. This research contributes to the ongoing research in MEMS by evaluating the potential of using surface micromachining as a process for fabricating compliant micro-mechanisms.

  14. The effects of migrant remittances on population–environment dynamics in migrant origin areas: international migration, fertility, and consumption in highland Guatemala

    E-Print Network [OSTI]

    Davis, Jason; Lopez-Carr, David

    2010-01-01

    Guatemala-to-US migration, total primary energy consumptionwas the primary motivation for most US migration (Table 4).

  15. Real-time inclinometer using accelerometer MEMS

    E-Print Network [OSTI]

    Hanto, D; Hermanto, B; Puranto, P; Handoko, L T

    2011-01-01

    A preliminary design of inclinometer for real-time monitoring system of soil displacement is proposed. The system is developed using accelerometer sensor with microelectromechanical system (MEMS) device. The main apparatus consists of a single MEMS sensor attached to a solid pipe and stucked pependicularly far away below the soil surface. The system utilizes small fractions of electrical signals from MEMS sensor induced by the pipe inclination due to soil displacements below the surface. It is argued that the system is accurate enough to detect soil displacements responsible for landslides, and then realizes a simple and low cost landslide early warning system.

  16. FABI WORK IN NATIVE PINE FORESTS IN GUATEMALA Project title: Understanding pest and pathogen threats to pine under expanding global cultivation

    E-Print Network [OSTI]

    FABI WORK IN NATIVE PINE FORESTS IN GUATEMALA Project title: Understanding pest and pathogen on common pine species in Guatemala, particularly those under testing as hybrid partners with Pinus patula, the University of San Carlos and the private forestry sector in Guatemala to discuss the project and avenues

  17. La prise en compte des populations locales dans la mise en place d'aires protges : tudes de cas au Guatemala et au Maroc

    E-Print Network [OSTI]

    Vellend, Mark

    au Guatemala et au Maroc Par Vincens Côté essai présenté au Département de biologie pour l la gestion de deux aires protégées, l'une au Guatemala et l'autre au Maroc, et tente d'en dégager des Guatemala compte des aires protégées depuis 1955. Sa loi sur les aires protégées a été votée en 1989, et sa

  18. Petroleum geology of Pacific margin of Central America and northern South America, from Guatemala to Ecuador

    SciTech Connect (OSTI)

    Scrutton, M.E.; Escalante, G.F.

    1986-07-01

    Exploration for hydrocarbons along the Pacific margin of Central America and northern South America has been limited and spasmodic. Less than 100 exploration wells have been drilled, with nearly 50 of these being in the Santa Elena, Progreso, and Guayas basins in Ecuador. Shows have been reported in some wells, and a few oil seeps are known. The only commercial production established to date has been from the Santa Elena Peninsula in Ecuador in the extreme south of the study area. Understanding of the geology in this part of the continental margin is incomplete at best. This paper reviews present-day knowledge in an attempt to define the sedimentary basins better, to characterize their structure and stratigraphy, and to assess their petroleum prospects. The area of continental margin reviewed is to the north, located northwest of the trench system where oceanic crust of the Cocos plate subducts under the Caribbean plate, and to the south, where the northern part of the Nazca plate collides with the South American plate. This plate tectonic setting forms the framework on which local structural and sedimentary events have created a series of relatively small trench-slope and forearc basins in what is now the coastal plain and adjacent offshore area of Central and South America, south or west of a line of mountain ranges with active volcanism. Sedimentary fill is generally of Tertiary age. The basins and subbasins recognized and described include: in Ecuador - Guayas, Santa Elena, Progreso, Valdivia, Bajo Grande, Manta, Muisne-Esmeraldas, and Borbon; in Colombia - Choco-Pacific; in Panama - Gulf of Panama basin complex (Santiago, Tonosi, Sambu), and Burica-Chiriqui; in Costa Rica - Terraba and Coronado/Tempisque; in Nicaragua - San Juan del Sur; and in the Honduras, El Salvador, and Guatemala - the Pacific coastal basin.

  19. Solder self-assembly for MEMS fabrication

    E-Print Network [OSTI]

    Au, Hin Meng, 1977-

    2004-01-01

    This thesis examines and demonstrates self-assembly of MEMS components on the 25 micron scale onto substrates using the capillary force of solder. This is an order of magnitude smaller than current solder self-assembly in ...

  20. Si-based RF MEMS components.

    SciTech Connect (OSTI)

    Stevens, James E.; Nordquist, Christopher Daniel; Baker, Michael Sean; Fleming, James Grant; Stewart, Harold D.; Dyck, Christopher William

    2005-01-01

    Radio frequency microelectromechanical systems (RF MEMS) are an enabling technology for next-generation communications and radar systems in both military and commercial sectors. RF MEMS-based reconfigurable circuits outperform solid-state circuits in terms of insertion loss, linearity, and static power consumption and are advantageous in applications where high signal power and nanosecond switching speeds are not required. We have demonstrated a number of RF MEMS switches on high-resistivity silicon (high-R Si) that were fabricated by leveraging the volume manufacturing processes available in the Microelectronics Development Laboratory (MDL), a Class-1, radiation-hardened CMOS manufacturing facility. We describe novel tungsten and aluminum-based processes, and present results of switches developed in each of these processes. Series and shunt ohmic switches and shunt capacitive switches were successfully demonstrated. The implications of fabricating on high-R Si and suggested future directions for developing low-loss RF MEMS-based circuits are also discussed.

  1. MEMS Materials and Processes: a research overview

    E-Print Network [OSTI]

    Spearing, S. Mark

    An overview is provided of materials and processes research currently being conducted in support of MEMS device design at MIT. Underpinning research is being conducted in five areas: room temperature strength characterization, ...

  2. Piezoelectric MEMS resonator characterization and filter design

    E-Print Network [OSTI]

    Kang, Joung-Mo, 1978-

    2004-01-01

    This thesis presents modeling and first measurements of a new piezoelectric MEMS resonator developed at Draper Laboratory. In addition, some simple filter designs incorporating the resonator with predicted performance ...

  3. 05670_MEMS | netl.doe.gov

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

    Fabry-Perot MEMS Accelerometers for Advanced Seismic Imaging Last Reviewed 1212015 DE-FC26-09NT0005670 Goal The objective of this project is to build an accelerometer and...

  4. Measuring large topographic change with InSAR: Lava thicknesses, extrusion rate and subsidence rate at Santiaguito volcano, Guatemala

    E-Print Network [OSTI]

    Elliott, John

    at Santiaguito volcano, Guatemala S.K. Ebmeier a,n , J. Biggs b , T.A. Mather a , J.R. Elliott a , G. Wadge c , F. We apply this to Santiaguito volcano, Guatemala, and measure increases in lava thickness of up to 140

  5. Fatigue of polycrystalline silicon for MEMS applications: Crack growth and stability under resonant loading conditions

    E-Print Network [OSTI]

    Muhlstein, C.L.; Howe, R.T.; Ritchie, R.O.

    2001-01-01

    Materials Science of Microelectromechanical System (MEMS)Materials Science of Microelectromechanical System (MEMS)Muhlstein, C. (Eds. ), Microelectromechanical Structures for

  6. Challenges in the Packaging of MEMS

    SciTech Connect (OSTI)

    BROWN, WILLIAM D.; EATON, WILLIAM P.; MALSHE, AJAY P.; MILLER, WILLIAM M.; O'NEAL, CHAD; SINGH, SUSHILA B.

    1999-09-24

    Microelectromechanical Systems (MEMS) packaging is much different from conventional integrated circuit (IC) packaging. Many MEMS devices must interface to the environment in order to perform their intended function, and the package must be able to facilitate access with the environment while protecting the device. The package must also not interfere with or impede the operation of the MEMS device. The die attachment material should be low stress, and low outgassing, while also minimizing stress relaxation overtime which can lead to scale factor shifts in sensor devices. The fabrication processes used in creating the devices must be compatible with each other, and not result in damage to the devices. Many devices are application specific requiring custom packages that are not commercially available. Devices may also need media compatible packages that can protect the devices from harsh environments in which the MEMS device may operate. Techniques are being developed to handle, process, and package the devices such that high yields of functional packaged parts will result. Currently, many of the processing steps are potentially harmful to MEMS devices and negatively affect yield. It is the objective of this paper to review and discuss packaging challenges that exist for MEMS systems and to expose these issues to new audiences from the integrated circuit packaging community.

  7. (Energy efficiency improvement studies for Costa Rica and Guatemala)

    SciTech Connect (OSTI)

    Waddle, D.B.

    1990-05-30

    I travelled to San Jose, Cost Rica, on May 20, 1990 to report on the progress of the Integrated Power Sector Efficiency Analysis Project to the Instituto Costarrincense de Electricidad, and to USAID/San Jose. I also discussed the progress and plans for the CONELECTRICAS Small Hydroelectric Project supported by ORNL through the Renewable Energy Applications and Training Project. Both projects are proceeding on schedule. ORNL will complete further supply side analysis after comments are submitted by ICE, with respect to the information provided on this visit. The CONELECTRICAS project will require further ORNL input to assist in optimization of equipment selection and to perform the required financial and economic cost analyses. I travelled to Guatemala City on May 22, 1990. I met with Instituto Nacional de Electricacion (INDE) to discuss the findings and recommendations of the Electric Power Utility Efficiency Improvement Study undertaken in February, 1990. I also met with Mario Funes to discuss future ORNL assistance to ROCAP in support of the CARES project as well as other ROCAP energy initiatives.

  8. Hydrogeochemical exploration of the Tecuamburro Volcano region, Guatemala

    SciTech Connect (OSTI)

    Goff, F.; Truesdell, A.H.; Janik, C.J.; Adams, A.; Roldan-M, A.; Meeker, K. (Los Alamos National Lab., NM (USA); Geological Survey, Menlo Park, CA (USA); Los Alamos National Lab., NM (USA); Instituto Nacional de Electrificacion, Guatemala City (Guatemala). Unidad de Desarollo Geotermico; Los Alamos National Lab., NM (USA))

    1989-01-01

    Approximately 100 thermal and nonthermal water samples and 20 gas samples from springs and fumaroles have been chemically and isotopically analyzed to help evaluate the geothermal potential of the Tecuamburro Volcano region, Guatemala. Thermal waters of the acid- sulfate, steam condensate, and neutral-chloride types generally occur in restricted hydrogeologic areas: Tecuamburro-Laguna Ixpaco (acid- sulfate); andesite highland north of Tecuamburro (steam-condensate); Rio Los Esclavos (neutral-chloride). One small area of neutral-chloride springs east of the village of Los Esclavos has no relation to the Tecuamburro geothermal system. Neutral-chloride springs on the Rio Los Esclavos east and southeast of Tecuamburro show mixing with various types of groundwaters and display a maximum oxygen-18 enrichment compared to the world meteoric line of only about 1.5 parts per thousand. Maximum estimated subsurface temperatures are {le}200{degree}C. In contrast, maximum estimated subsurface temperatures based on gas compositions in the Laguna Ixpaco area are about 300{degree}C. The relation of neutral-chloride waters to the overall Tecuamburro geothermal system is not entirely resolved but we have suggested two system models. Regardless of model, we believe that a first exploration drill hole should be sited within 0.5 km of Laguna Ixpaco to tap the main geothermal reservoir or its adjacent, main upflow zone. 9 refs., 4 figs., 3 tabs.

  9. Characteristics of the Zunil Geothermal Field (Western Guatemala)

    SciTech Connect (OSTI)

    Bethancourt, H.R.; Dominco, E.

    1982-10-01

    The Zunil geothermal field represents the marginal, shallow expression of a vast geothermal complex buried beneath active volcanic edifices (Cerro Quemado, Volcan Santa Maria, Western Guatemala) some kilometers to the west. The area lies at the edge of a tecto-volcanic depression where some 1,000 m of Tertiary and Quaternary volcanics are underlain by a granodioritic basement. High temperature geothermal fluids (over 280/sup 0/C) reach the field from the west, upflowing along the inclined contact between the granodioritic and the overlying volcanics, and along fractures in the basement itself. A conglomeratic layer at the volcanics/basement contact, and the underlying weathered cap of the basement form the only permeable horizon of the succession; this horizon forms the local reservoir tapped by the productive wells. Its reduced thickness (around 50 m) allows for a limited fluid storage such that field production relies on external recharge along the permeable horizon and underlying fractures in the granodiorite. Production testing and simulation models indicate a fairly rapid evolution of reservoir conditions from the liquid to the steam phase, due to pressure drawdown, in its turn due to a restricted inflow. The phenomenon determines an upgrading of the fluid enthalpy, but a decline of mass output. Simulated reinjection into the reservoir proved to be an effective measure to slow down such an evolution and optimize the field exploitation.

  10. Studies of geothermal power and process heat applications in St. Lucia and Guatemala

    SciTech Connect (OSTI)

    Altseimer, J.H.; Edeskuty, F.J.

    1986-01-01

    Many countries have the potential to use geothermal energy for both power production and process heat applications. Two Los Alamos programs have studied the most effective use of geothermal energy in St. Lucia and Guatemala. The general objectives are (1) to reduce oil imports; (2) develop employment opportunities; and (3) make products more competitive. The initial St. Lucia studies emphasized power generation but a number of applications for the power plant's residual heat were also found and costs and systems have been determined. The costs of geothermal heat compare favorably with heat from other sources such as oil. In Guatemala, the development of the nation's first geothermal field is well advanced. Process heat applications and their coordination with power generation plants are being studied at Los Alamos. Guatemala has at least two fields that appear suitable for power and heat production. These fields are close to urban centers and to many potential heat applications.

  11. Petroleum geology and resources of southeastern Mexico, northern Guatemala, and Belize

    SciTech Connect (OSTI)

    Peterson, J.A.

    1986-05-01

    Petroleum deposits in southeastern Mexico and Guatemala occur in two main basinal provinces: the Gulf Coast Tertiary basin area, which includes the Reforma and offshore Campeche Mesozoic fields, and the Peten basin of eastern Chiapas State (Mexico) and Guatemala. Major oil production, in order of importance, is from Cretaceous, Paleocene, and Jurassic carbonate reservoirs in the reforma and offshore Campeche area. Several small oil fields have been discovered in Cretaceous carbonate reservoirs in west-central Guatemala. Almost all important production is in salt structure traps or on domes and anticlines that may be related to deep-seated salt movement. Some minor oil production has occurred in Cretaceous carbonate reservoirs in a buried overthrust belt along the west flank of the Veracruz basin. Gas production is mainly from Tertiary sandstone reservoirs.

  12. Electrical power systems (Guatemala). Non-current carriers, March 1991. Export trade information

    SciTech Connect (OSTI)

    Not Available

    1991-03-02

    The article analyzes the non-current carrying devices market in Guatemala and contains the following subtopics: market assessment, competitive situation, market access, trade promotion opportunities, best sales prospects, and statistical data. The market for noncurrent-carrying devices in Guatemala totalled US $4.3 million in 1988, compared with a total of US $5.0 million in 1989. Approximately US $6.4 million is expected in 1990. Of this import market, the United States has always had the greatest share.

  13. Polymer-Ceramic MEMS Bimorphs as Thermal Infrared Sensors

    E-Print Network [OSTI]

    Warren, Clinton Gregory

    2010-01-01

    et al. , Trilayered Ceramic-Metal-Polymer MicrocantileversPolymer-Ceramic MEMS Bimorphs as Thermal Infrared Sensors byLin Spring 2010 Polymer-Ceramic MEMS Bimorphs as Thermal

  14. Dynamics of Electrostatic MEMS Actuators

    E-Print Network [OSTI]

    Yang, Yisong; Zhao, Le

    2012-01-01

    Electrostatic actuators are simple but important switching devices for MEMS applications. Due to the difficulties associated with the electrostatic nonlinearity, precise mathematical description is often hard to obtain for the dynamics of these actuators. Here we present two sharp theorems concerning the dynamics of an undamped electrostatic actuator with one-degree of freedom, subject to linear and nonlinear elastic forces, respectively. We prove that both situations are characterized by the onset of one-stagnation-point periodic response below a well-defined pull-in voltage and a finite-time touch-down or collapse of the actuator above this pull-in voltage. In the linear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate of the movable electrode may all be determined explicitly, following the recent work of Leus and Elata based on numerics. Furthermore, in the nonlinear-force situation, the stagnation level, pull-in voltage, and pull-in coordinate may be described completely in t...

  15. A Nuclear Microbattery for MEMS Devices

    SciTech Connect (OSTI)

    Blanchard, James; Henderson, Douglass; Lal, Amit

    2002-08-20

    This project was designed to demonstrate the feasibility of producing on-board power for MEMS devices using radioisotopes. MEMS is a fast growing field, with hopes for producing a wide variety of revolutionary applications, including ''labs on a chip,'' micromachined scanning tunneling microscopes, microscopic detectors for biological agents, microsystems for DNA identification, etc. Currently, these applications are limited by the lack of an on-board power source. Research is ongoing to study approaches such as fuel cells, fossil fuels, and chemical batteries, but all these concepts have limitations. For long-lived, high energy density applications, on-board radioisotope power offers the best choice. We have succeeded in producing such devices using a variety of isotopes, incorporation methods, and device geometries. These experiments have demonstrated the feasibility of using radioisotope power and that there are a variety of options available for MEMS designers. As an example of an integrated, self-powered application, we have created an oscillating cantilever beam that is capable of consistent, periodic oscillations over very long time periods without the need for refueling. Ongoing work will demonstrate that this cantilever is capable of radio frequency transmission, allowing MEMS devices to communicate with one another wirelessly. Thus, this will be the first self-powered wireless transmitter available for use in MEMS devices, permitting such applications as sensors embedded in buildings for continuous monitoring of the building performance and integrity.

  16. Combined photonics and MEMs function demonstration

    SciTech Connect (OSTI)

    Blum, O.; Warren, M.E.; Hou, H.Q.; Choquette, K.D.; Rogers, M.S.; Sniegowski, J.J. [Sandia National Labs., Albuquerque, NM (United States); Carson, R.F. [Microoptical Devices, Inc., Albuquerque, NM (United States)

    1998-01-01

    The authors have recently demonstrated two prototypes where photonics and microelectromechanical system (MEMs) technologies have been integrated to show proof-of-principle functionality for weapon surety functions. These activities are part of a program which is exploring the miniaturization of electromechanical components for making weapon systems safer. Such miniaturization can lead to a low-cost, small, high-performance ``systems-on-a-chip``, and have many applications ranging from advanced military systems to large-volume commercial markets like automobiles, rf or land-based communications networks and equipment, or commercial electronics. One of the key challenges in realization of the microsystem is integration of several technologies including digital electronics; analog and rf electronics, optoelectronics (light emitting and detecting devices and circuits), sensors and actuators, and advanced packaging technologies. In this work the authors describe efforts in integrating MEMs and photonic functions and the fabrication constraints on both system components. Here, they discuss two examples of integration of MEMs and a photonic device. In the first instance, a MEMs locking device pin is driven by a voltage generated by photovoltaic cells connected in series, which are driven by a laser. In the second case, a VCSEL emitting at 1.06 {micro}m is packaged together with a metallized MEMs shutter. By appropriate alignment to the opening in the shutter, the VCSEL is turned on and off by the movement of the Si chopper wheel.

  17. DEVELOPMENT OF BROADBAND LOW-VOLTAGE RF MEM SWITCHES

    E-Print Network [OSTI]

    Shen, Shyh-Chiang

    DEVELOPMENT OF BROADBAND LOW-VOLTAGE RF MEM SWITCHES S.C. Shen, D. T. Becher, D. C. Caruth, and M)333-4054 Fax: (217) 244-6375 Abstract We present novel RF switches using micro-electro- mechanical (MEM) technology. These MEM switches are built on GaAs substrates using GaAs MESFET MMIC- compatible processes

  18. Operating System Management of MEMS-based Storage Devices

    E-Print Network [OSTI]

    : Microelectromechanical systems (MEMS), operating systems, secondary storage, request schedul- ing, data placement, faultOperating System Management of MEMS-based Storage Devices John Linwood GriÃ?n, Steven W. Schlosser University Pittsburgh, PA 15213 Abstract MEMS-based storage devices promise signi#12;cant performance

  19. Digital Fingerprints for Low-Cost Platforms using MEMS sensors

    E-Print Network [OSTI]

    Schaumont, Patrick

    Digital Fingerprints for Low-Cost Platforms using MEMS sensors Aydin Aysu, Nahid Farhady Ghalaty. In this paper, we target a commonly used MEMS sensor, an accelerometer, and utilize its process variations electrostatic impulse and its inherent offset values. Our results revealed that MEMS sensors could be used

  20. Model Reduction for RF MEMS Simulation David S. Bindel1

    E-Print Network [OSTI]

    California at Davis, University of

    Model Reduction for RF MEMS Simulation David S. Bindel1 , Zhaojun Bai2 , and James W. Demmel3 1@eecs.berkeley.edu Abstract. Radio-frequency (RF) MEMS resonators, integrated into CMOS chips, are of great interest-preserving model-reduction techniques and apply them to the frequency-domain analysis of two proposed MEMS

  1. Characterization of Contour Shapes Achievable with a MEMS Deformable Mirror

    E-Print Network [OSTI]

    Bifano, Thomas

    Characterization of Contour Shapes Achievable with a MEMS Deformable Mirror Yaopeng Zhou and Thomas for a particular AO application can be determined. In this paper, we characterize one MEMS DM that was recently electrostatic actuation in an architecture that has been described previously. We incorporated the MEMS mirror

  2. RF MEMS DC CONTACT SWTCHES FOR RECONFIGURABLE Presented to the

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    RF MEMS DC CONTACT SWTCHES FOR RECONFIGURABLE ANTENNAS _______________ A Thesis Presented STATE UNIVERSITY The Undersigned Faculty Committee Approves the Thesis of Lei Zhou: RF DC Contact MEMS rock and water, water, through persistence, eventually wins. #12;vi ABSTRACT OF THE THESIS RF MEMS DC

  3. PARAMETRICALLY EXICITED MEMS-BASED Steven W. Shaw1

    E-Print Network [OSTI]

    PARAMETRICALLY EXICITED MEMS-BASED FILTERS Steven W. Shaw1 , Kimberly L. Turner2 , Jeffrey F: In this paper we describe the dynamics of MEMS oscillators that can be used as frequency filters. The unique of the input and the nonlinear nature of the response. Here we provide a brief background on filters, a MEMS

  4. MEMS: Detection and Tracking of Mobile Eevents Using Mobile Sensors

    E-Print Network [OSTI]

    Han, Qi "Chee"

    MEMS: Detection and Tracking of Mobile Eevents Using Mobile Sensors Na Yu and Qi Han Department interchangeably in the following. This paper presents MEMS--a novel pipelined approach for dynamic event detection and tracking. The noteworthy features of MEMS are that it (1) uses detection robots in a distributed way; (2

  5. A CMOS Potentiostat for Control of Integrated MEMS Actuators

    E-Print Network [OSTI]

    Maryland at College Park, University of

    A CMOS Potentiostat for Control of Integrated MEMS Actuators Somashekar Bangalore Prakash, Pamela-- We describe a potentiostat designed for in situ electrochemical control of MEMS actuators. This module is tailored for integration into a hybrid CMOS-MEMS system-on- a-chip to confine cells and measure

  6. MEMS-based storage devices and standard disk interfaces

    E-Print Network [OSTI]

    MEMS-based storage devices and standard disk interfaces: A square peg in a round hole? Steven W University Pittsburgh, PA 15213-3890 Abstract MEMS-based storage devices are a new technology works for existing systems, and by showing that these reasons hold for MEMS-based storage. This result

  7. Multiple Solutions in Electrostatic MEMS J.A. Pelesko*

    E-Print Network [OSTI]

    Pelesko, John

    Multiple Solutions in Electrostatic MEMS J.A. Pelesko* * Georgia Institute of Technology, School is the principle phe- nomena limiting the design of nearly every electrostat- ically actuated MEMS device for the system. Here a generalized model of a small aspect ratio electrostatically actuated MEMS device

  8. Design and Fabrication of a MEMS Capacitive Chemical Sensor System

    E-Print Network [OSTI]

    Baker, R. Jacob

    Design and Fabrication of a MEMS Capacitive Chemical Sensor System Vishal Saxena, Todd J. Plum-- This paper describes the development of a MEMS sensor system to detect volatile compounds. The sensor consists of a MEMS capacitive sensor element monolithically integrated with a sensing circuit. The sensor

  9. Distributed MEMS Transmission Lines for Tunable Filter Applications

    E-Print Network [OSTI]

    York, Robert A.

    Distributed MEMS Transmission Lines for Tunable Filter Applications Yu Liu, Andrea Borgioli, Amit S: This paper describes the design and fabrication of a distributed MEMS ( )transmission line DMTL , used is a coplanar waveguide periodically loaded with continuously-variable MEMS capacitors. A tunable bandpass

  10. Hierarchical MEMS Synthesis and Optimization Ying Zhang1

    E-Print Network [OSTI]

    Agogino, Alice M.

    Hierarchical MEMS Synthesis and Optimization Ying Zhang1 , Raffi Kamalian2 , Alice M. Agogino3 and Computer Sciences, University of California, Berkeley ABSTRACT A hierarchical MEMS synthesis and optimization architecture has been developed for MEMS design automation. The architecture integrates an object

  11. Micro Contacts and Micro Manipulation with MEMS Actuator Arrays

    E-Print Network [OSTI]

    Richardson, David

    Micro Contacts and Micro Manipulation with MEMS Actuator Arrays Karl­Friedrich B¨ohringer Bruce technology for MEMS (micro electro mechanical systems) increase the availability and diversity out tasks using coordinated systems of MEMS units motivates the development of automated, algorithmic

  12. Alternative structures for two-dimensional MEMS optical switches [Invited

    E-Print Network [OSTI]

    Wai, Ping-kong Alexander

    Two-dimensional (2-D) microelectromechanical system (MEMS) optical switches have the merits of easy technologies have been proposed for building OXCs. Microelectromechanical system (MEMS) optical switches haveAlternative structures for two-dimensional MEMS optical switches [Invited] Victor O. K. Li

  13. Failure analysis issues in microelectromechanical systems (MEMS).

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen

    2005-07-01

    Failure analysis and device characterization of MEMS components are critical steps in understanding the root causes of failure and improving device performance. At the wafer and die level these tasks can be performed with little or no sample preparation. Larger challenges occur after fabrication when the device is packaged, capped, sealed, or otherwise obstructed from view. The challenges and issues of MEMS failure analysis lie in identifying the root cause of failure for these packaged, capped, and sealed devices without perturbing the device or its immediate environment. Novel methods of gaining access to the device or preparing the device for analysis are crucial to accurately determining the root cause of failure. This paper will discuss issues identified in performing root cause failure analysis of packaged MEMS devices, as well as the methods employed to analyze them.

  14. IC-Compatible Technologies for Optical MEMS

    SciTech Connect (OSTI)

    Krygowski, T.W.; Sniegowski, J.J.

    1999-04-30

    Optical Micro Electro Mechanical Systems (Optical MEMS) Technology holds the promise of one-day producing highly integrated optical systems on a common, monolithic substrate. The choice of fabrication technology used to manufacture Optical MEMS will play a pivotal role in the size, functionality and ultimately the cost of optical Microsystems. By leveraging the technology base developed for silicon integrated circuits, large batches of routers, emitters, detectors and amplifiers will soon be fabricated for literally pennies per part. In this article we review the current status of technologies used for Optical MEMS, as well as fabrication technologies of the future, emphasizing manufacturable surface micromachining approaches to producing reliable, low-cost devices for optical communications applications.

  15. Release Resistant Electrical Interconnections For Mems Devices

    DOE Patents [OSTI]

    Peterson, Kenneth A. (Albuquerque, NM); Garrett, Stephen E. (Albuquerque, NM); Reber, Cathleen A. (Corrales, NM)

    2005-02-22

    A release resistant electrical interconnection comprising a gold-based electrical conductor compression bonded directly to a highly-doped polysilicon bonding pad in a MEMS, IMEMS, or MOEMS device, without using any intermediate layers of aluminum, titanium, solder, or conductive adhesive disposed in-between the conductor and polysilicon pad. After the initial compression bond has been formed, subsequent heat treatment of the joint above 363 C creates a liquid eutectic phase at the bondline comprising gold plus approximately 3 wt % silicon, which, upon re-solidification, significantly improves the bond strength by reforming and enhancing the initial bond. This type of electrical interconnection is resistant to chemical attack from acids used for releasing MEMS elements (HF, HCL), thereby enabling the use of a "package-first, release-second" sequence for fabricating MEMS devices. Likewise, the bond strength of an Au--Ge compression bond may be increased by forming a transient liquid eutectic phase comprising Au-12 wt % Ge.

  16. Late Quaternary palaeoenvironment of northern Guatemala: evidence from deep drill cores and seismic stratigraphy of Lake

    E-Print Network [OSTI]

    Gilli, Adrian

    of an International Continental Scientific Drilling Program project. The sediment records from deep water consist, overlain by deep-water clays, suggest a lake level rise and subsequent stabilization at high stage. From caLate Quaternary palaeoenvironment of northern Guatemala: evidence from deep drill cores and seismic

  17. Land parcel fragmentation in the agricultural frontier: Sierra del Lacandn National Park, Guatemala

    E-Print Network [OSTI]

    Lopez-Carr, David

    , Guatemala Laurel K. Suter David L. Carr Department of Geography University of California, Santa Barbara are often viewed as the primary proximate agents of deforestation (Rudel and Roper 1996; Carr 2005). Although population growth is positively associated with agricultural expansion in Latin America (Carr

  18. A survey of geothermal process heat applications in Guatemala: An engineering survey

    SciTech Connect (OSTI)

    Altseimer, J.H.; Edeskuty, F.J.

    1988-08-01

    This study investigates how process heat from Guatemala's geothermal energy resources can be developed to reduce Guatemala's costly importation of oil, create new employment by encouraging new industry, and reduce fuel costs for existing industry. This investigation was funded by the US Agency for International Development and carried out jointly by the Guatemalan Government and the Los Alamos National Laboratory. Two sites, Amatitlan and Zunil, are being developed geothermally. Amatitlan is in the better industrial area but Zunil's geothermal development is more advanced. The industry around Zunil is almost exclusively agricultural and the development of an agricultural processing plant (freezing, dehydration, and cold storage) using geothermal heat is recommended. Similar developments throughout the volcanic zones of Guatemala are possible. Later, when the field at Amatitlan has been further developed, an industrial park can be planned. Potential Amatitlan applications are the final stage of salt refining, a thermal power plant, hospital/hotel heating and cooling, steam curing of concrete blocks, production of alcohol from sugar cane, and production of polyethylene from ethanol. Other special developments such as water pumping for the city of Guatemala and the use of moderate-temperature geothermal fluids for localized power production are also possible. 12 refs., 13 figs., 14 tabs.

  19. Assessing and Modeling Exposure to Indoor Air Pollution among Rural Women in Guatemala

    E-Print Network [OSTI]

    Assessing and Modeling Exposure to Indoor Air Pollution among Rural Women in Guatemala Lisa pollution in rural areas of developing countries. It is estimated that about half (53%) of all households in the poor countries of Latin American use biofuels (wood, dung and/or crop residues) to cook. Combustion by

  20. MEMS reliability: The challenge and the promise

    SciTech Connect (OSTI)

    Miller, W.M.; Tanner, D.M.; Miller, S.L.; Peterson, K.A.

    1998-05-01

    MicroElectroMechanical Systems (MEMS) that think, sense, act and communicate will open up a broad new array of cost effective solutions only if they prove to be sufficiently reliable. A valid reliability assessment of MEMS has three prerequisites: (1) statistical significance; (2) a technique for accelerating fundamental failure mechanisms, and (3) valid physical models to allow prediction of failures during actual use. These already exist for the microelectronics portion of such integrated systems. The challenge lies in the less well understood micromachine portions and its synergistic effects with microelectronics. This paper presents a methodology addressing these prerequisites and a description of the underlying physics of reliability for micromachines.

  1. Introduction to applications and industries for Microelectromechanical Systems (MEMS).

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen

    2003-07-01

    Microelectromechanical Systems (MEMS) have gained acceptance as viable products for many commercial and government applications. MEMS are currently being used as displays for digital projection systems, sensors for airbag deployment systems, inkjet print head systems, and optical routers. This paper will discuss current and future MEMS applications. What are MEMS? MEMS are typically defined as microscopic devices designed, processed, and used to interact or produce changes within a local environment. A mechanical, electrical, or chemical stimulus can be used to create a mechanical, electrical, or chemical response in a local environment. These smaller, more sophisticated devices that think, act, sense, and communicate are replacing their bulk counterparts in many traditional applications.

  2. Design of a Class of Antennas Utilizing MEMS, EBG and Septum Polarizers including Near-field Coupling Analysis

    E-Print Network [OSTI]

    Kim, Ilkyu

    2012-01-01

    packaged MEMS (microelectromechanical system) switch, and aantennas based on MEMS (Microelectromechanical ii Systems)design, based on MEMS (Microelectromechanical Systems) and

  3. Instituto Nacional de Electrification, Guatemala Load Dispatch Center and Global Communications Center. Feasibility report (Instituto Nacional de Electrificacion, Guatemala Centro Nacional de Despacho de Carga y Sistema Global de Comunicaciones). Export trade information

    SciTech Connect (OSTI)

    Not Available

    1985-07-01

    The report presents the results of a feasibility study for the National Load Dispatch Center and Global Communications System Project in Guatemala. The project consists of a communication system which will provide Institute Nacional de Electrificacion (INDE) operations personnel direct voice access to all major power system facilities. In addition, a modern computer based load dispatch center has been configured on a secure and reliable basis to provide automatic generation control of all major interconnected generating plants within Guatemala.

  4. Trace element and technological analyses of obsidian artifacts from the Northern ridge of Lake Atitlan, Department of Solola, Guatemala 

    E-Print Network [OSTI]

    Woodward, Michelle Ruth

    1996-01-01

    One hundred obsidian artifacts from the San Jose Chacaya site area located along the northern ridge of Lake Atitlan, Guatemala were subjected to Neutron Activation Analysis (NAA) to determine their provenience. In addition, sixty-six samples from...

  5. "Health is a business for everyone and is not a right to anyone:" Neoliberal health care provision in rural Guatemala

    E-Print Network [OSTI]

    Fernandes da Cunha Loureiro Amorim, Clarice

    2012-08-31

    Guatemala caught the attention of the international community as it emerged from its civil war. The stabilization offered by the Peace Accords of 1996 allowed the World Bank and the Inter-American Development Bank to urge ...

  6. Written in invisible ink : a case study on the politics of free trade reform and labor regulation in Guatemala

    E-Print Network [OSTI]

    Pipkin, Seth Daniel

    2006-01-01

    This thesis makes two primary claims: first, that the US - Dominican Republic - Central America Free Trade Agreement (US-DR CAFTA, or CAFTA) has had important effects on labor regulation in Guatemala that are not contained ...

  7. MEMS micropump for a Micro Gas Analyzer

    E-Print Network [OSTI]

    Sharma, Vikas, 1979-

    2009-01-01

    This thesis presents a MEMS micro-vacuum pump designed for use in a portable gas analysis system. It is designed to be pneumatically-driven and as such does not have self-contained actuation (the focus of future work). ...

  8. 221Mem Inst Oswaldo Cruz, Rio de Janeiro, Vol. 102(2): 221-223, March 2007 The number of families of Triatoma dimidiata in a

    E-Print Network [OSTI]

    Dorn, Patricia

    Aplicada y Parasitología, Escuela de Biología, Facultad de Farmacia, Universidad de San Carlos de Guatemala, Edificio T-10, Ciudad Universitaria Zona 12, Ciudad de Guatemala, Guatemala *Loyola University New Orleans, New Orleans, US Triatoma dimidiata is an important vector of Chagas disease in Guatemala. To help

  9. HIGH-ASPECT-RATIO INDUCTIVELY COUPLED PLASMA ETCHING OF BULK TITANIUM FOR MEMS APPLICATIONS

    E-Print Network [OSTI]

    MacDonald, Noel C.

    HIGH-ASPECT-RATIO INDUCTIVELY COUPLED PLASMA ETCHING OF BULK TITANIUM FOR MEMS APPLICATIONS E. R system for the bulk micromachining of MEMS devices. Titanium-based MEMS have the potential to be used for the microfabrication of titanium- based MEMS devices. INTRODUCTION Traditionally, microelectromechanical systems (MEMS

  10. Page 1 of 24 Case-based Reasoning for Evolutionary MEMS Design

    E-Print Network [OSTI]

    Agogino, Alice M.

    Page 1 of 24 Case-based Reasoning for Evolutionary MEMS Design Corie L. Cobb1 and Alice M. Agogino2-aided design tool for microelectromechanical systems (MEMS) design synthesis called CaSyn-MEMS (Case-based Synthesis of MEMS) has been developed. MEMS-based technologies have the potential to revolutionize many

  11. SPICE Level 3 and BSIM3v3.1 characterization of monolithic integrated CMOS-MEMS devices

    SciTech Connect (OSTI)

    Staple, B.D.; Watts, H.A.; Dyck, C.; Griego, A.P.; Hewlett, F.W.; Smith, J.H.

    1998-08-01

    The monolithic integration of MicroElectroMechanical Systems (MEMS) with the driving, controlling, and signal processing electronics promises to improve the performance of micromechanical devices as well as lower their manufacturing, packaging, and instrumentation costs. Key to this integration is the proper interleaving, combining, and customizing of the manufacturing processes to produce functional integrated micromechanical devices with electronics. The authors have developed a MEMS-first monolithic integrated process that first seals the micromechanical devices in a planarized trench and then builds the electronics in a conventional CMOS process. To date, most of the research published on this technology has focused on the performance characteristics of the mechanical portion of the devices, with little information on the attributes of the accompanying electronics. This work attempts to reduce this information void by presenting the results of SPICE Level 3 and BSIM3v3.1 model parameters extracted for the CMOS portion of the MEMS-first process. Transistor-level simulations of MOSFET current, capacitance, output resistance, and transconductance versus voltage using the extracted model parameters closely match the measured data. Moreover, in model validation efforts, circuit-level simulation values for the average gate propagation delay in a 101-stage ring oscillator are within 13--18% of the measured data. In general, the BSIM3v3.1 models provide improved accuracy over the SPICE Level 3 models. These results establish the following: (1) the MEMS-first approach produces functional CMOS devices integrated on a single chip with MEMS devices and (2) the devices manufactured in the approach have excellent transistor characteristics. Thus, the MEMS-first approach renders a solid technology foundation for customers designing in the technology.

  12. Sandia Agile MEMS Prototyping, Layout Tools, Education and Services Program

    SciTech Connect (OSTI)

    Schriner, H.; Davies, B.; Sniegowski, J.; Rodgers, M.S.; Allen, J.; Shepard, C.

    1998-05-01

    Research and development in the design and manufacture of Microelectromechanical Systems (MEMS) is growing at an enormous rate. Advances in MEMS design tools and fabrication processes at Sandia National Laboratories` Microelectronics Development Laboratory (MDL) have broadened the scope of MEMS applications that can be designed and manufactured for both military and commercial use. As improvements in micromachining fabrication technologies continue to be made, MEMS designs can become more complex, thus opening the door to an even broader set of MEMS applications. In an effort to further research and development in MEMS design, fabrication, and application, Sandia National Laboratories has launched the Sandia Agile MEMS Prototyping, Layout Tools, Education and Services Program or SAMPLES program. The SAMPLES program offers potential partners interested in MEMS the opportunity to prototype an idea and produce hardware that can be used to sell a concept. The SAMPLES program provides education and training on Sandia`s design tools, analysis tools and fabrication process. New designers can participate in the SAMPLES program and design MEMS devices using Sandia`s design and analysis tools. As part of the SAMPLES program, participants` designs are fabricated using Sandia`s 4 level polycrystalline silicon surface micromachine technology fabrication process known as SUMMiT (Sandia Ultra-planar, Multi-level MEMS Technology). Furthermore, SAMPLES participants can also opt to obtain state of the art, post-fabrication services provided at Sandia such as release, packaging, reliability characterization, and failure analysis. This paper discusses the components of the SAMPLES program.

  13. The effects of migrant remittances on population–environment dynamics in migrant origin areas: international migration, fertility, and consumption in highland Guatemala

    E-Print Network [OSTI]

    Davis, Jason; Lopez-Carr, David

    2010-01-01

    family aintenance, and Mexico-US migration. Demographic2009). Compared with Mexico, migration between Guatemala andof migration on infant survival in Mexico. Demography, 36(

  14. MEMS Materials and Temperature Sensors for Down Hole Geothermal System Monitoring

    E-Print Network [OSTI]

    Wodin-Schwartz, Sarah

    2013-01-01

    introduces microelectromechanical systems (MEMS) sensors asMEMS temperature sensors for 275C applications - part 2 design and technology. Journal of MicroelectromechanicalMEMS temperature sensors for 275C applications - part 2 creep and cycling performance. Journal of Microelectromechanical

  15. Method and instrumentation for the measurement and characterization of MEMS fabricated electrical contacts

    E-Print Network [OSTI]

    Read, Melissa B. (Melissa Beth), 1982-

    2010-01-01

    MEMS fabricated electrical contacts consist of two MEMS fabricated surfaces which are physically separated and brought together for the purpose of carrying current. MEMS fabricated electrical contacts are used in a wide ...

  16. Imaging the foveal cone mosaic with a MEMS-based adaptive optics scanning laser ophthalmoscope

    E-Print Network [OSTI]

    Li, Yiang

    2010-01-01

    YH, Poonja S, Roorda A. MEMS-based adaptive optics scanningcontrol algorithms for a MEMS-based adaptive optics scanningTG. Open-loop control of a MEMS deformable mirror for large-

  17. A MEMS Thin Film AlN Supercritical Carbon Dioxide Valve

    E-Print Network [OSTI]

    Chen, Ya-Mei

    2011-01-01

    D. P. Bame, and T. K. Tang, “MEMS micro-valve for spaceof the fabricated thermal MEMS valve by Kim et al. [Y. -C. Tai, and C-M. Ho, “A MEMS thermopneumatic silicone

  18. Robust free space board-to-board optical interconnect with closed loop MEMS tracking

    E-Print Network [OSTI]

    2009-01-01

    Optical beam steering using MEMS-controllable mi- crolensNikola- jeff, G. Andersson, MEMS-based vcsel beam steeringWu, O. Solgaard, Optical MEMS for lightwave commu- nication.

  19. High performance RF MEMS metal-contact switches and switching networks

    E-Print Network [OSTI]

    Patel, Chirag D.; Patel, Chirag D.

    2012-01-01

    A Compact Cantilever-Based RF MEMS Switch andA High-Performance RF MEMS Metal-Contact Switch and Switch-B High-Q 3-/4-Bit RF MEMS Digitally Tunable Capacitors for

  20. Quasi-optical network analyzers and high-reliability RF MEMS switched capacitors

    E-Print Network [OSTI]

    Grichener, Alexander

    2011-01-01

    Chapter 3 High-Reliability RF MEMS Switched Capacitors 3.1Technology 1.2 RF MEMS Technology . . . . . . . . . . . . .Reliability High-Q Switched RF MEMS Capacitors” IEEE Int.

  1. Algorithmic MEMS Karl Friedrich Bohringer, University of California at Berkeley, Berkeley, CA 94720

    E-Print Network [OSTI]

    Richardson, David

    Algorithmic MEMS Karl Friedrich B¨ohringer, University of California at Berkeley, Berkeley, CA technology for MEMS (microelectromechanical systems) increase the avail­ ability and diversity out tasks using large coordinated systems of MEMS units motivates the de­ velopment of automated

  2. Monolithic integration of a MOSFET with a MEMS device

    DOE Patents [OSTI]

    Bennett, Reid (Albuquerque, NM); Draper, Bruce (Albuquerque, MN)

    2003-01-01

    An integrated microelectromechanical system comprises at least one MOSFET interconnected to at least one MEMS device on a common substrate. A method for integrating the MOSFET with the MEMS device comprises fabricating the MOSFET and MEMS device monolithically on the common substrate. Conveniently, the gate insulator, gate electrode, and electrical contacts for the gate, source, and drain can be formed simultaneously with the MEMS device structure, thereby eliminating many process steps and materials. In particular, the gate electrode and electrical contacts of the MOSFET and the structural layers of the MEMS device can be doped polysilicon. Dopant diffusion from the electrical contacts is used to form the source and drain regions of the MOSFET. The thermal diffusion step for forming the source and drain of the MOSFET can comprise one or more of the thermal anneal steps to relieve stress in the structural layers of the MEMS device.

  3. Energy expenditure and socioeconomic status in Guatemala as measured by the doubly labelled water method

    SciTech Connect (OSTI)

    Stein, T.P.; Johnston, F.E.; Greiner, L.

    1988-02-01

    The energy expenditure of lower (group 1) and upper socioeconomic group females (group 2) from a marginal community in Guatemala City was determined by using the doubly labelled water method. Energy expenditure values were 1925 +/- 66 (mean, SEM) kcal/d (group 1) and 2253 +/- 145 kcal/d group 2 (p less than 0.03). About half of this difference can be attributed to size.

  4. Electrical power systems (Brazil, Chile, Colombia, Dominican Republic, Guatemala, Jamaica, Panama and Peru)

    SciTech Connect (OSTI)

    Not Available

    1992-01-01

    This 12-part set of reports contains market information on the following countries and topics: Brazil - potentiometers, steam turbines, gas turbines, electric generators; Chile - power systems; Colombia - electric generators; Dominican Republic - electric generators; Guatemala - power generation and distribution equipment, non-current carriers, electric generators, and turbines; Jamaica - power systems; Panama - power generation and control equipment; and Peru - power generation equipment. These reports have been processed separately for inclusion on the data base.

  5. Application of scientific core drilling to geothermal exploration: Platanares, Honduras and Tecuamburro Volcano, Guatemala, Central America

    SciTech Connect (OSTI)

    Goff, S.J.; Goff, F.E.; Heiken, G.H. [Los Alamos National Lab., NM (United States); Duffield, W.A. [Geological Survey, Flagstaff, AZ (United States); Janik, C.J. [Geological Survey, Menlo Park, CA (United States)

    1994-04-01

    Our efforts in Honduras and Guatemala were part of the Central America Energy Resource Project (CAERP) funded by the United States Agency for International Development (AID). Exploration core drilling operations at the Platanares, Honduras and Tecuamburro Volcano, Guatemala sites were part of a geothermal assessment for the national utility companies of these countries to locate and evaluate their geothermal resources for electrical power generation. In Honduras, country-wide assessment of all thermal areas determined that Platanares was the site with the greatest geothermal potential. In late 1986 to middle 1987, three slim core holes were drilled at Platanares to a maximum depth of 680 m and a maximum temperature of 165{degree}C. The objectives were to obtain information on the geothermal gradient, hydrothermal alterations, fracturing, and possible inflows of hydrothermal fluids. Two holes produced copious amounts of water under artesian conditions and a total of 8 MW(t) of energy. Geothermal investigations in Guatemala focused on the Tecuamburro Volcano geothermal site. The results of surface geological, volcanological, hydrogeochemical, and geophysical studies at Tecuamburro Volcano indicated a substantial shallow heat source. In early 1990 we drilled one core hole, TCB-1, to 808 m depth. The measured bottom hole temperature was 238{degree}C. Although the borehole did not flow, in-situ samples indicate the hole is completed in a vapor-zone above a probable 300{degree}C geothermal reservoir.

  6. Electroplating of low stress permalloy for MEMS

    SciTech Connect (OSTI)

    Zhang Yonghua [National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiaotong University, Shanghai 200030 (China)]. E-mail: zyh@sjtu.edu.cn; Ding Guifu [National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiaotong University, Shanghai 200030 (China); Cai Yuli [National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiaotong University, Shanghai 200030 (China); Wang Hong [National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiaotong University, Shanghai 200030 (China); Cai Bingchu [National Key Laboratory of Nano/Micro Fabrication Technology, Research Institute of Micro/Nanometer Science and Technology, Shanghai Jiaotong University, Shanghai 200030 (China)

    2006-08-15

    With the wafer-bending method and spectrophotometry, the internal stress in electroplated Ni-Fe alloy for MEMS has been investigated as a function of bath concentration. This investigation demonstrated that low concentration plating solution is useful for the decrease of the residual stress in the electrodeposits, and the stress could further decrease with an increase of saccharin additive content. And the change of stress from tensile to compressive was not observed with the increase of the additive content in plating path. The low stress permalloy (Ni{sub 81}Fe{sub 19}) was reached in our experimental conditions. A bistable electromagnetic RF MEMS switch with deformation-free bilayer cantilever beam was fabricated successfully by electroplated permalloy.

  7. MEMS Packaging - Current Issues and Approaches

    SciTech Connect (OSTI)

    DRESSENDORFER,PAUL V.; PETERSON,DAVID W.; REBER,CATHLEEN ANN

    2000-01-19

    The assembly and packaging of MEMS (Microelectromechanical Systems) devices raise a number of issues over and above those normally associated with the assembly of standard microelectronic circuits. MEMS components include a variety of sensors, microengines, optical components, and other devices. They often have exposed mechanical structures which during assembly require particulate control, space in the package, non-contact handling procedures, low-stress die attach, precision die placement, unique process schedules, hermetic sealing in controlled environments (including vacuum), and other special constraints. These constraints force changes in the techniques used to separate die on a wafer, in the types of packages which can be used in the assembly processes and materials, and in the sealing environment and process. This paper discusses a number of these issues and provides information on approaches being taken or proposed to address them.

  8. Strength of Polysilicon for MEMS Devices

    SciTech Connect (OSTI)

    Buchheit, Thomas E.; LaVan, David A.

    1999-07-20

    The safe, secure and reliable application of Microelectromechanical Systems (MEMS) devices requires knowledge about the distribution in material and mechanical properties of the small-scale structures. A new testing program at Sandia is quantifying the strength distribution using polysilicon samples that reflect the dimensions of critical MEMS components. The strength of polysilicon fabricated at Sandia's Microelectronic Development Laboratory was successfully measured using samples 2.5 microns thick, 1.7 microns wide with lengths between 15 and 25 microns. These tensile specimens have a freely moving hub on one end that anchors the sample to the silicon die and allows free rotation. Each sample is loaded in uniaxial tension by pulling laterally with a flat tipped diamond in a computer-controlled Nanoindenter. The stress-strain curve is calculated using the specimen cross section and gage length dimensions verified by measuring against a standard in the SEM.

  9. Accurate Telescope Mount Positioning with MEMS Accelerometers

    E-Print Network [OSTI]

    Mészáros, László; Pál, András; Csépány, Gergely

    2014-01-01

    This paper describes the advantages and challenges of applying microelectromechanical accelerometer systems (MEMS accelerometers) in order to attain precise, accurate and stateless positioning of telescope mounts. This provides a completely independent method from other forms of electronic, optical, mechanical or magnetic feedback or real-time astrometry. Our goal is to reach the sub-arcminute range which is well smaller than the field-of-view of conventional imaging telescope systems. Here we present how this sub-arcminute accuracy can be achieved with very cheap MEMS sensors and we also detail how our procedures can be extended in order to attain even finer measurements. In addition, our paper discusses how can a complete system design be implemented in order to be a part of a telescope control system.

  10. Porous Alumina Based Capacitive MEMS RH Sensor

    E-Print Network [OSTI]

    Juhasz, L; Timar-Horvath, Veronika; Desmulliez, Marc; Dhariwal, Resh

    2008-01-01

    The aim of a joint research and development project at the BME and HWU is to produce a cheap, reliable, low-power and CMOS-MEMS process compatible capacitive type relative humidity (RH) sensor that can be incorporated into a state-of-the-art, wireless sensor network. In this paper we discuss the preparation of our new capacitive structure based on post-CMOS MEMS processes and the methods which were used to characterize the thin film porous alumina sensing layer. The average sensitivity is approx. 15 pF/RH% which is more than a magnitude higher than the values found in the literature. The sensor is equipped with integrated resistive heating, which can be used for maintenance to reduce drift, or for keeping the sensing layer at elevated temperature, as an alternative method for temperature-dependence cancellation.

  11. Image Registration for Stability Testing of MEMS

    E-Print Network [OSTI]

    Memarsadeghi, Nargess; Blake, Peter N; Morey, Peter A; Landsman, Wayne B; Chambers, Victor J; Moseley, Samuel H; 10.1117/12.872076

    2013-01-01

    Image registration, or alignment of two or more images covering the same scenes or objects, is of great interest in many disciplines such as remote sensing, medical imaging, astronomy, and computer vision. In this paper, we introduce a new application of image registration algorithms. We demonstrate how through a wavelet based image registration algorithm, engineers can evaluate stability of Micro-Electro-Mechanical Systems (MEMS). In particular, we applied image registration algorithms to assess alignment stability of the MicroShutters Subsystem (MSS) of the Near Infrared Spectrograph (NIRSpec) instrument of the James Webb Space Telescope (JWST). This work introduces a new methodology for evaluating stability of MEMS devices to engineers as well as a new application of image registration algorithms to computer scientists.

  12. Predicting fracture in micron-scale polycrystalline silicon MEMS...

    Office of Scientific and Technical Information (OSTI)

    Predicting fracture in micron-scale polycrystalline silicon MEMS structures. Citation Details In-Document Search Title: Predicting fracture in micron-scale polycrystalline silicon...

  13. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    Brown, “Challenges in the Packaging of MEMS,” InternationalSymposium on Advanced Packaging Materials, pp. 41-47,Wafer-Level Chip Scale Packaging?: Benefits for Integrated

  14. The Sandia MEMS Passive Shock Sensor : FY08 failure analysis...

    Office of Scientific and Technical Information (OSTI)

    analysis activities. Citation Details In-Document Search Title: The Sandia MEMS Passive Shock Sensor : FY08 failure analysis activities. No abstract prepared. Authors:...

  15. Ultra-lightweight telescope with MEMS adaptive optic for distortion...

    Office of Scientific and Technical Information (OSTI)

    on the deployable mirrors. To meet this challenge, MEMS micromirrors must meet stringent criteria on their performance in terms of flatness, roughness and resolution of position....

  16. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    Journal of Microelectromechanical Systems, vol. 2, no. 1,Journal of Microelectromechanical Systems, vol. 13, no. 5,Judy, “Microelectromechanical systems (MEMS): fabrication,

  17. Thin Film Encapsulation Methods for Large Area MEMS Packaging

    E-Print Network [OSTI]

    Mahajerin, Armon

    2012-01-01

    Machinery,” Journal of Microelectromechanical Systems, vol.Journal of Microelectromechanical Systems, vol. 13, no. 5,1995. J. W. Judy, “Microelectromechanical systems (MEMS):

  18. Thin Silicon MEMS Contact-Stress Sensor Kotovksy, J; Tooker,...

    Office of Scientific and Technical Information (OSTI)

    A; Horsley, D 42 ENGINEERING; 42 ENGINEERING; ACCURACY; ACTUATORS; SILICON This thin, MEMS contact-stress sensor continuously and accurately measures time-varying, solid...

  19. Characterization of monolayer surface treatments for MEMS exposed...

    Office of Scientific and Technical Information (OSTI)

    Conference: Characterization of monolayer surface treatments for MEMS exposed to possible back-end-of-line conditions. Citation Details In-Document Search Title: Characterization...

  20. Thin Silicon MEMS Contact-Stress Sensor Kotovsky, J; Tooker,...

    Office of Scientific and Technical Information (OSTI)

    ACCURACY; ACTUATORS; CALIBRATION; DIAPHRAGM; SILICON; STABILITY; THICKNESS This thin, MEMS contact-stress (CS) sensor continuously and accurately measures time-varying, solid...

  1. Thin Silicon MEMS Contact-Stress Sensor Kotovsky, J; Tooker,...

    Office of Scientific and Technical Information (OSTI)

    LIFETIME; PACKAGING; PERFORMANCE; SILICON; THICKNESS This work offers the first, thin, MEMS contact-stress (CS) sensor capable of accurate in situ measruement of time-varying,...

  2. Polymer-Ceramic MEMS Bimorphs as Thermal Infrared Sensors

    E-Print Network [OSTI]

    Warren, Clinton Gregory

    2010-01-01

    Recent Developments in Polymer MEMS. Advanced Materials,using thin silicon/polymer bimorph membranes. Sensors andof cantilever arrays reveal polymer film expansion and

  3. Stress-tolerant and temperature-stable RF MEMS capacitive switches and tunable filters

    E-Print Network [OSTI]

    Reines, Isak C.

    2010-01-01

    Millimeter-wave microelectromechanical MEMS switches forMEMS switched capac- itors with stress-tolerance and temperature-stability ,” accepted for publication in IEEE Journal Microelectromechanical

  4. Assessment of MeMS Sensors in an Urban Traffic Environment

    E-Print Network [OSTI]

    Varaiya, Pravin

    2004-01-01

    BERKELEY Assessment of MeMS Sensors in an Urban Traf?cAND HIGHWAYS Assessment of MeMS Sensors in an Urban Traffic

  5. Automated MEMS-based Drosophila embryo injection system for high-throughput RNAi screens

    E-Print Network [OSTI]

    Scott, Matthew

    Automated MEMS-based Drosophila embryo injection system for high-throughput RNAi screens Stefan developed an automated system based on microelectromechanical systems (MEMS) injectors for reliable mass

  6. Tunable Young's Modulus in Carbon MEMS using Graphene-based Stiffeners...

    Office of Scientific and Technical Information (OSTI)

    Tunable Young's Modulus in Carbon MEMS using Graphene-based Stiffeners. Citation Details In-Document Search Title: Tunable Young's Modulus in Carbon MEMS using Graphene-based...

  7. The challenge of reliability in MEMS commercialization

    SciTech Connect (OSTI)

    Miller, W.M.; Tanner, D.M.; Miller, S.L.

    1998-09-01

    MicroElectroMechanical Systems (MEMS) that think, sense, act and communicate will open up a broad new array of cost-effective solutions only if MEMS is demonstrated to be sufficiently reliable. This could prove to be a major challenge if it is not addressed concurrently with technology development. There are three requirements for a valid assessment of reliability: statistical significance, identification of fundamental failure mechanisms and development of techniques for accelerating them, and valid physical models to allow prediction of failures during actual use. While these already exist for the microelectronics portion of such integrated systems, the real challenge lies in the less well-understood micromachine portions and its synergistic effects with microelectronics. This requires the elicitation of a methodology focused on MEMS reliability, which the authors discuss. A new testing and analysis infrastructure must also be developed to meet the needs of this methodology. They describe their implementation of this infrastructure and its success in addressing the three requirements for a valid reliability assessment.

  8. Radioisotope Power Sources for MEMS Devices,

    SciTech Connect (OSTI)

    Blanchard, J.P.

    2001-06-17

    Microelectromechanical systems (MEMS) comprise a rapidly expanding research field with potential applications varying from sensors in airbags to more recent optical applications. Depending on the application, these devices often require an on-board power source for remote operation, especially in cases requiring operation for an extended period of time. Previously suggested power sources include fossil fuels and solar energy, but nuclear power sources may provide significant advantages for certain applications. Hence, the objective of this study is to establish the viability of using radioisotopes to power realistic MEMS devices. A junction-type battery was constructed using silicon and a {sup 63}Ni liquid source. A source volume containing 64 {micro}Ci provided a power of {approx}0.07 nW. A more novel application of nuclear sources for MEMS applications involves the creation of a resonator that is driven by charge collection in a cantilever beam. Preliminary results have established the feasibility of this concept, and future work will optimize the design for various applications.

  9. Solid polymer MEMS-based fuel cells

    DOE Patents [OSTI]

    Jankowski, Alan F. (Livermore, CA); Morse, Jeffrey D. (Pleasant Hill, CA)

    2008-04-22

    A micro-electro-mechanical systems (MEMS) based thin-film fuel cells for electrical power applications. The MEMS-based fuel cell may be of a solid oxide type (SOFC), a solid polymer type (SPFC), or a proton exchange membrane type (PEMFC), and each fuel cell basically consists of an anode and a cathode separated by an electrolyte layer. The electrolyte layer can consist of either a solid oxide or solid polymer material, or proton exchange membrane electrolyte materials may be used. Additionally catalyst layers can also separate the electrodes (cathode and anode) from the electrolyte. Gas manifolds are utilized to transport the fuel and oxidant to each cell and provide a path for exhaust gases. The electrical current generated from each cell is drawn away with an interconnect and support structure integrated with the gas manifold. The fuel cells utilize integrated resistive heaters for efficient heating of the materials. By combining MEMS technology with thin-film deposition technology, thin-film fuel cells having microflow channels and full-integrated circuitry can be produced that will lower the operating temperature an will yield an order of magnitude greater power density than the currently known fuel cells.

  10. Solid oxide MEMS-based fuel cells

    DOE Patents [OSTI]

    Jankowksi, Alan F.; Morse, Jeffrey D.

    2007-03-13

    A micro-electro-mechanical systems (MEMS) based thin-film fuel cells for electrical power applications. The MEMS-based fuel cell may be of a solid oxide type (SOFC), a solid polymer type (SPFC), or a proton exchange membrane type (PEMFC), and each fuel cell basically consists of an anode and a cathode separated by an electrolyte layer. The electrolyte layer can consist of either a solid oxide or solid polymer material, or proton exchange membrane electrolyte materials may be used. Additionally catalyst layers can also separate the electrodes (cathode and anode) from the electrolyte. Gas manifolds are utilized to transport the fuel and oxidant to each cell and provide a path for exhaust gases. The electrical current generated from each cell is drawn away with an interconnect and support structure integrated with the gas manifold. The fuel cells utilize integrated resistive heaters for efficient heating of the materials. By combining MEMS technology with thin-film deposition technology, thin-film fuel cells having microflow channels and full-integrated circuitry can be produced that will lower the operating temperature an will yield an order of magnitude greater power density than the currently known fuel cells.

  11. VERSATILE VACUUM PACKAGING FOR EXPERIMENTAL STUDY OF RESONANT MEMS

    E-Print Network [OSTI]

    Tang, William C

    VERSATILE VACUUM PACKAGING FOR EXPERIMENTAL STUDY OF RESONANT MEMS Adam R. Schofield, Alexander A a versatile sub-mTorr vacuum packaging approach ideally suited for R&D of high performance dynamic MEMS techniques and experimentally characterized to determine the sealed vacuum level. The combination of high

  12. Tools and techniques for failure analysis and qualification of MEMS.

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen

    2003-07-01

    Many of the tools and techniques used to evaluate and characterize ICs can be applied to MEMS technology. In this paper we discuss various tools and techniques used to provide structural, chemical, and electrical analysis and how these data aid in qualifying MEMS technologies.

  13. RF-MEMS capacitive switches with high reliability

    DOE Patents [OSTI]

    Goldsmith, Charles L.; Auciello, Orlando H.; Carlisle, John A.; Sampath, Suresh; Sumant, Anirudha V.; Carpick, Robert W.; Hwang, James; Mancini, Derrick C.; Gudeman, Chris

    2013-09-03

    A reliable long life RF-MEMS capacitive switch is provided with a dielectric layer comprising a "fast discharge diamond dielectric layer" and enabling rapid switch recovery, dielectric layer charging and discharging that is efficient and effective to enable RF-MEMS switch operation to greater than or equal to 100 billion cycles.

  14. Pre-release plastic packaging of MEMS and IMEMS devices

    DOE Patents [OSTI]

    Peterson, Kenneth A. (Albuquerque, NM); Conley, William R. (Tijeras, NM)

    2002-01-01

    A method is disclosed for pre-release plastic packaging of MEMS and IMEMS devices. The method can include encapsulating the MEMS device in a transfer molded plastic package. Next, a perforation can be made in the package to provide access to the MEMS elements. The non-ablative material removal process can include wet etching, dry etching, mechanical machining, water jet cutting, and ultrasonic machining, or any combination thereof. Finally, the MEMS elements can be released by using either a wet etching or dry plasma etching process. The MEMS elements can be protected with a parylene protective coating. After releasing the MEMS elements, an anti-stiction coating can be applied. The perforating step can be applied to both sides of the device or package. A cover lid can be attached to the face of the package after releasing any MEMS elements. The cover lid can include a window for providing optical access. The method can be applied to any plastic packaged microelectronic device that requires access to the environment, including chemical, pressure, or temperature-sensitive microsensors; CCD chips, photocells, laser diodes, VCSEL's, and UV-EPROMS. The present method places the high-risk packaging steps ahead of the release of the fragile portions of the device. It also provides protection for the die in shipment between the molding house and the house that will release the MEMS elements and subsequently treat the surfaces.

  15. SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD

    E-Print Network [OSTI]

    Horowitz, Roberto

    SUSPENSION VIBRATION COMPENSATION USING A MEMS MICROACTUATOR IN HARD DISK DRIVES Tsung-Lin Chen Kenn Oldham Yunfeng Li Roberto Horowitz ,1,2 Department of Mechanical Engineering, University of a prototype MEMS microactuator and vibration sensors, and controller design for suspension vibration

  16. Reliability Testing of Polysilicon For MEMs Devices

    SciTech Connect (OSTI)

    LaVan, D.A.; Buchheit, T.E.

    1999-04-05

    Mission critical applications of MEMS devices require knowledge of the distribution in their material properties and long-term reliability of the small-scale structures. This project reports on a new testing program at Sandia to quantify the strength distribution using samples that reflect the dimensions of critical MEMS components. The strength of polysilicon fabricated with Sandia's SUMMiT 4-layer process was successfully measured using samples with gage sections 2.5 {micro}m thick by 1.7 {micro}m wide and lengths of 15 and 25 {micro}m. These tensile specimens have a freely moving pivot on one end that anchors the sample to the silicon die and prevents off axis loading during testing. Each sample is loaded in uniaxial tension by pulling laterally with a flat tipped diamond in a computer-controlled Nanoindenter. The stress-strain curve is calculated using the specimen cross section and gage length dimensions verified by measuring against a standard in the SEM. The first 48 samples had a means strength of 2.24 {+-} 0.35 GPa. Fracture strength measurements grouped into three strength levels, which matched three failure modes observed in post mortem examinations. The seven samples in the highest strength group failed in the gage section (strength of 2.77 {+-} 0.04 GPa), the moderate strength group failed at the gage section fillet and the lowest strength group failed at a dimple in the hub. With this technique, multiple tests can be programmed at one time and performed without operator assistance at a rate of 20-30 per day allowing the collection of significant populations of data. Since the new test geometry has been proven, the project is moving to test the distributions seen from real geometric features typical to MEMS such as the effect of gage length, fracture toughness, bonding between layers, etch holes, dimples and shear of gear teeth.

  17. MEMS Materials and Temperature Sensors for Down Hole Geothermal System Monitoring

    E-Print Network [OSTI]

    Wodin-Schwartz, Sarah

    2013-01-01

    Monitoring Geothermal Environments . . . . . . . . . . . . . . . . . . . . . . . . . . . .down hole environment monitoring. Harsh environment sensorsfor Geothermal Monitoring Harsh environment MEMS sensors

  18. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 23, NO. 3, JUNE 2014 517 Optical MEMS: From Micromirrors

    E-Print Network [OSTI]

    Peter, Yves-Alain

    JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 23, NO. 3, JUNE 2014 517 Optical MEMS: From-Alain Peter, Senior Member, IEEE, and Hans Zappe Abstract--Microelectromechanical system (MEMS) technol- ogy from miniaturization through MicroElectroMechanical Sys- tems (MEMS). Optical MEMS is a focus

  19. Mem. S.A.It. Suppl. Vol. 21, 168 c SAIt 2012

    E-Print Network [OSTI]

    California at Berkeley, University of

    Mem. S.A.It. Suppl. Vol. 21, 168 c SAIt 2012 Memorie della Supplementi The New Ultra-Fast Flash. MEMS mirror arrays fabricated at the Research Center for MEMS Space Telescopes (RCMST) of Ewha Woman (UFFO) concept uses an X-ray coded mask camera to trigger a MEMS mirror array to point an optical

  20. American Institute of Aeronautics and Astronautics A MEMS Floating Element with Bump Shear Stress Sensor

    E-Print Network [OSTI]

    White, Robert D.

    and temporal resolution. In the last two decades, MEMS-based shear stress sensors have emerged as a possible-9]. The previous MEMS-based sensors to appear in the literature have two common features: 1) all MEMS wafer and calibrated only up to 1~2 Pa; 2) A majority of MEMS-based sensors besides floating element

  1. This paper presents the development of a simulation program (SUGAR) for planar MEMS devices. The approach

    E-Print Network [OSTI]

    California at Berkeley, University of

    ABSTRACT This paper presents the development of a simulation program (SUGAR) for planar MEMS, and high-level sim- ulation package for MEMS. Keywords: MEMS, SUGAR, nodal analysis, nonlinear model, Matlab INTRODUCTION Rapid development of MEMS technology requires CAD tools for support. Most

  2. RF-MEMS load sensors with enhanced Q-factor and sensitivity in a suspended architecture

    E-Print Network [OSTI]

    Demir, Hilmi Volkan

    RF-MEMS load sensors with enhanced Q-factor and sensitivity in a suspended architecture Rohat Melik-implant RF-MEMS a b s t r a c t In this paper, we present and demonstrate RF-MEMS load sensors designed the strain change in real-time. For this purpose, we present RF- MEMS resonator sensors that shift

  3. A modular process for integrating thick polysilicon MEMS devices with sub-micron CMOS

    E-Print Network [OSTI]

    Afshari, Ehsan

    A modular process for integrating thick polysilicon MEMS devices with sub-micron CMOS John-1774 ABSTRACT A new MEMS process module, called Mod MEMS, has been developed to monolithically integrate thick (5-10um), multilayer polysilicon MEMS structures with sub-micron CMOS. This process is particularly

  4. Biological Micro-Electrical Mechanical Systems Micro-electrical mechanical systems (MEMS) created new

    E-Print Network [OSTI]

    Hill, Wendell T.

    Biological Micro-Electrical Mechanical Systems (bioMEMS) Micro-electrical mechanical systems (MEMS beginning to be explored. bioMEMS combine the potential of cell-sized systems with the advantages in cutting edge research in bioMEMS to revolutionize mechanized drug discovery processes, non- invasive

  5. A Novel Adaptive Approach to Modeling MEMS Tunable Capacitors Using MRTD and FDTD Techniques

    E-Print Network [OSTI]

    Tentzeris, Manos

    A Novel Adaptive Approach to Modeling MEMS Tunable Capacitors Using MRTD and FDTD Techniques Nathan for modeling MEMS tunable capacitors that is based on the coupling of physical motion of the MEMS device MEMS devices are discussed, and ways to compensate for several of these are presented. The proposed

  6. Microwave Laminate PCB Compatible RF MEMS Technology for Wireless Communication Systems

    E-Print Network [OSTI]

    De Flaviis, Franco

    Microwave Laminate PCB Compatible RF MEMS Technology for Wireless Communication Systems * Bedri A microwave laminate printed circuit board (PCB) compatible RF MEMS technology for wireless communication systems. This technology is novel in that RF MEMS components, particularly RF MEM switches, can

  7. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 18, NO. 1, FEBRUARY 2009 103 Indium Phosphide MEMS Cantilever Resonator

    E-Print Network [OSTI]

    Rubloff, Gary W.

    JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 18, NO. 1, FEBRUARY 2009 103 Indium Phosphide MEMS, microelectromechanical system (MEMS) cantilevers, pentacene, III­V MEMS. I. INTRODUCTION THE NEED to monitor. Fan, N. Goldsman, and R. Ghodssi are with the MEMS Sensors and Actuators Laboratory, Department

  8. IEEE SENSORS JOURNAL, VOL. 3, NO. 5, OCTOBER 2003 595 Active Structural Error Suppression in MEMS

    E-Print Network [OSTI]

    Chen, Zhongping

    -run perturbations are presented. Index Terms--Error suppression, microelectromechanical sys- tems (MEMS), rate integrating gyroscopes, smart MEMS. I. INTRODUCTION AS MICROELECTROMECHANICAL systems (MEMS) inertial sensorsIEEE SENSORS JOURNAL, VOL. 3, NO. 5, OCTOBER 2003 595 Active Structural Error Suppression in MEMS

  9. MEMS-reconfigurable metamaterials and antenna applications

    E-Print Network [OSTI]

    Debogovic, Tomislav

    2014-01-01

    This paper reviews some of our contributions to reconfigurable metamaterials, where dynamic control is enabled by micro-electro-mechanical systems (MEMS) technology. First, we show reconfigurable composite right/left handed transmission lines (CRLH-TLs) having state of the art phase velocity variation and loss, thereby enabling efficient reconfigurable phase shifters and leaky-wave antennas (LWA). Second, we present very low loss metasurface designs with reconfigurable reflection properties, applicable in reflectarrays and partially reflective surface (PRS) antennas. All the presented devices have been fabricated and experimentally validated. They operate in X- and Ku-bands.

  10. High fidelity frictional models for MEMS.

    SciTech Connect (OSTI)

    Carpick, Robert W. (University of Wisconsin, Madison, WI); Reedy, Earl David, Jr.; Bitsie, Fernando; de Boer, Maarten Pieter; Corwin, Alex David; Ashurst, William Robert (Auburn University, Auburn, AL); Jones, Reese E.; Subhash, Ghatu S. (Michigan Technological Institute, Houghton, MI); Street, Mark D. (University of Wisconsin, Madison, WI); Sumali, Anton Hartono; Antoun, Bonnie R.; Starr, Michael James; Redmond, James Michael; Flater, Erin E. (University of Wisconsin, Madison, WI)

    2004-10-01

    The primary goals of the present study are to: (1) determine how and why MEMS-scale friction differs from friction on the macro-scale, and (2) to begin to develop a capability to perform finite element simulations of MEMS materials and components that accurately predicts response in the presence of adhesion and friction. Regarding the first goal, a newly developed nanotractor actuator was used to measure friction between molecular monolayer-coated, polysilicon surfaces. Amontons law does indeed apply over a wide range of forces. However, at low loads, which are of relevance to MEMS, there is an important adhesive contribution to the normal load that cannot be neglected. More importantly, we found that at short sliding distances, the concept of a coefficient of friction is not relevant; rather, one must invoke the notion of 'pre-sliding tangential deflections' (PSTD). Results of a simple 2-D model suggests that PSTD is a cascade of small-scale slips with a roughly constant number of contacts equilibrating the applied normal load. Regarding the second goal, an Adhesion Model and a Junction Model have been implemented in PRESTO, Sandia's transient dynamics, finite element code to enable asperity-level simulations. The Junction Model includes a tangential shear traction that opposes the relative tangential motion of contacting surfaces. An atomic force microscope (AFM)-based method was used to measure nano-scale, single asperity friction forces as a function of normal force. This data is used to determine Junction Model parameters. An illustrative simulation demonstrates the use of the Junction Model in conjunction with a mesh generated directly from an atomic force microscope (AFM) image to directly predict frictional response of a sliding asperity. Also with regards to the second goal, grid-level, homogenized models were studied. One would like to perform a finite element analysis of a MEMS component assuming nominally flat surfaces and to include the effect of roughness in such an analysis by using a homogenized contact and friction models. AFM measurements were made to determine statistical information on polysilicon surfaces with different roughnesses, and this data was used as input to a homogenized, multi-asperity contact model (the classical Greenwood and Williamson model). Extensions of the Greenwood and Williamson model are also discussed: one incorporates the effect of adhesion while the other modifies the theory so that it applies to the case of relatively few contacting asperities.

  11. Metal MEMS Devices | GE Global Research

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse BergkampCentermillionStockpile Stewardship NationalMEMS: Inside the Global

  12. An analysis of cattle-farming in the coffee producing area of the Pacific Slope in Guatemala 

    E-Print Network [OSTI]

    Cordon, Oscar Humberto

    1967-01-01

    AN ANALYSIS OF CATTLE-FARMING IN THE COFFEE PRODUCING AREA OF THE PACIFIC SLOPE IN GUATEMALA A Thesis By OSCAR HUMBERTO CORDON Submitted to the Graduate College of the Texas ASM University in partial fulfillment of the requirements... for the degree of MASTER OF SCIENCE January 1967 Ma]or Sub]ect: Animal Science AN ANALYSIS OF CATTLE-FARMING IN THE COFFEE PRODUCING AREA OF THE PACIFIC SLOPE IN GUATEMALA A Thesis By OSCAR HUMBERTO CORDON Approved as to style and content by: airman...

  13. Hydrogeochemical investigations in support of well logging operations at the Zunil geothermal field, Guatemala

    SciTech Connect (OSTI)

    Adams, A.; Golf, F.; Trujillo, P.E. Jr.; Counce, D.; Archuleta, J.; Dennis, B. (Los Alamos National Lab., NM (USA)); Medina, V. (Unidad de Desarrollo Geotermico, Guatemala City (Guatemala). Inst. Nacional de Electrificacion)

    1990-01-01

    A suite of 41 thermal and nonthermal waters in the Zunil-Quetzaltenango region, Guatemala, were collected as part of a well logging operation conducted by the Instituto Nacional de Electrificacion (INDE) and Los Alamos National Laboratory. Both in situ and weirbox samples were collected in the Zunil geothermal field. The various data suggest that the reservoir at Zunil is geochemically inhomogeneous. Stable isotope data suggest recharge to the field comes primarily from the north and east whereas tritium data indicate that the reservoir waters may be 500 to 7500 years old. 14 refs., 4 figs., 3 tabs.

  14. Photonic MEMS for NIR in-situ

    SciTech Connect (OSTI)

    Bond, T C; Cole, G D; Goddard, L L; Behymer, E

    2007-07-03

    We report on a novel sensing technique combining photonics and microelectromechanical systems (MEMS) for the detection and monitoring of gas emissions for critical environmental, medical, and industrial applications. We discuss how MEMS-tunable vertical-cavity surface-emitting lasers (VCSELs) can be exploited for in-situ detection and NIR spectroscopy of several gases, such as O{sub 2}, N{sub 2}O, CO{sub x}, CH{sub 4}, HF, HCl, etc., with estimated sensitivities between 0.1 and 20 ppm on footprints {approx}10{sup -3} mm{sup 3}. The VCSELs can be electrostatically tuned with a continuous wavelength shift up to 20 nm, allowing for unambiguous NIR signature determination. Selective concentration analysis in heterogeneous gas compositions is enabled, thus paving the way to an integrated optical platform for multiplexed gas identification by bandgap and device engineering. We will discuss here, in particular, our efforts on the development of a 760 nm AlGaAs based tunable VCSEL for O{sub 2} detection.

  15. The Sandia MEMS passive shock sensor : FY07 maturation activities.

    SciTech Connect (OSTI)

    Houston, Jack E.; Blecke, Jill; Mitchell, John Anthony; Wittwer, Jonathan W.; Crowson, Douglas A.; Clemens, Rebecca C.; Walraven, Jeremy Allen; Epp, David S.; Baker, Michael Sean

    2008-08-01

    This report describes activities conducted in FY07 to mature the MEMS passive shock sensor. The first chapter of the report provides motivation and background on activities that are described in detail in later chapters. The second chapter discusses concepts that are important for integrating the MEMS passive shock sensor into a system. Following these two introductory chapters, the report details modeling and design efforts, packaging, failure analysis and testing and validation. At the end of FY07, the MEMS passive shock sensor was at TRL 4.

  16. Population, Rural Development, and Land Use Among Settler Households in an Agricultural Frontier in Guatemala's Maya Biosphere Reserve

    E-Print Network [OSTI]

    Lopez-Carr, David

    in Guatemala's Maya Biosphere Reserve David Carr Ph.D. University of California, Santa Barbara carr increasingly occurs on impoverished soils (Carr, Barbieri et al., 2006). Agricultural frontier1 This paper). This is especially true in Latin America (Rudel & Roper 1996; Carr & Bilsborrow, 2001). Political, economic

  17. Superhydrophobic Surface Coatings for Microfluidics and MEMs.

    SciTech Connect (OSTI)

    Branson, Eric D.; Singh, Seema [Sandia National Laboratories, Livermore, CA] [Sandia National Laboratories, Livermore, CA; Houston, Jack E.; van Swol, Frank B.; Brinker, C. Jeffrey

    2006-11-01

    Low solid interfacial energy and fractally rough surface topography confer to Lotus plants superhydrophobic (SH) properties like high contact angles, rolling and bouncing of liquid droplets, and self-cleaning of particle contaminants. This project exploits the porous fractal structure of a novel, synthetic SH surface for aerosol collection, its self-cleaning properties for particle concentration, and its slippery nature 3 to enhance the performance of fluidic and MEMS devices. We propose to understand fundamentally the conditions needed to cause liquid droplets to roll rather than flow/slide on a surface and how this %22rolling transition%22 influences the boundary condition describing fluid flow in a pipe or micro-channel. Rolling of droplets is important for aerosol collection strategies because it allows trapped particles to be concentrated and transported in liquid droplets with no need for a pre-defined/micromachined fluidic architecture. The fluid/solid boundary condition is important because it governs flow resistance and rheology and establishes the fluid velocity profile. Although many research groups are exploring SH surfaces, our team is the first to unambiguously determine their effects on fluid flow and rheology. SH surfaces could impact all future SNL designs of collectors, fluidic devices, MEMS, and NEMS. Interfaced with inertial focusing aerosol collectors, SH surfaces would allow size-specific particle populations to be collected, concentrated, and transported to a fluidic interface without loss. In microfluidic systems, we expect to reduce the energy/power required to pump fluids and actuate MEMS. Plug-like (rather than parabolic) velocity profiles can greatly improve resolution of chip-based separations and enable unprecedented control of concentration profiles and residence times in fluidic-based micro-reactors. Patterned SH/hydrophilic channels could induce mixing in microchannels and enable development of microflow control elements. Acknowledgements This work was funded by Sandia National Laboratory's Laboratory Directed Research & Development program (LDRD). Some coating processes were conducted in the cleanroom facility located at the University of New Mexico's Center for High Technology Materials (CHTM). SEM images were performed at UNM's Center for Micro-Engineering on equipment funded by a NSF New Mexico EPSCoR grant. 4

  18. Reduced-order modeling of MEMS using modal basis functions

    E-Print Network [OSTI]

    Varghese, Mathew, 1973-

    2002-01-01

    The field of MEMS has matured significantly over the last two decades increasing in both complexity and level of integration. To keep up with the demands placed by these changes requires the development of computer-aided ...

  19. Characterization and modeling of polysilicon MEMS chemical-mechanical polishing

    E-Print Network [OSTI]

    Tang, Brian D. (Brian David), 1980-

    2004-01-01

    Heavily used in the manufacture of integrated circuits, chemical-mechanical polishing (CMP) is becoming an enabling technology for microelectromechanical systems (MEMS). To reliably use CMP in the manufacturing process, ...

  20. An electrothermally-actuated bistable MEMS relay for power applications

    E-Print Network [OSTI]

    Qiu, Jin, 1974-

    2003-01-01

    This thesis first develops a bistable mechanism that does not rely on internal stress or hinges for its bistability, which is then combined with transient electrothermal actuation and contact structure to develop a MEMS ...

  1. Magnetic machines and power electronics for power MEMS applications

    E-Print Network [OSTI]

    Das, Sauparna, 1979-

    2005-01-01

    This thesis presents the modeling, design, and characterization of microfabricated, surface-wound, permanent-magnet (PM) generators, and their power electronics, for use in Watt-level Power MEMS applications such as a ...

  2. Modeling and design of a MEMS piezoelectric vibration energy harvester

    E-Print Network [OSTI]

    Du Toit, Noël Eduard

    2005-01-01

    The modeling and design of MEMS-scale piezoelectric-based vibration energy harvesters (MPVEH) are presented. The work is motivated by the need for pervasive and limitless power for wireless sensor nodes that have application ...

  3. MemTable : contextual memory in group workspaces

    E-Print Network [OSTI]

    Hunter, Seth E

    2009-01-01

    This thesis presents the design and implementation of MemTable, an interactive touch table that supports co-located group meetings by capturing both digital and physical interactions in its memory. The goal of the project ...

  4. Multidisciplinary adaptive wireless communication systems: Reconfigurable MEMS integrated antennas &

    E-Print Network [OSTI]

    De Flaviis, Franco

    Multidisciplinary adaptive wireless communication systems: Reconfigurable MEMS integrated antennas of California, Irvine, USA Wireless communication systems with reconfigurability capabilities that can for the next generation communication scenarios. A communication system capable of changing its output

  5. Planarization techniques for MEMS: enabling new structures and enhancing manufacturability

    SciTech Connect (OSTI)

    Smith, J.H.

    1996-12-31

    Planarization techniques such as chemical-mechanical polishing (CMP) have emerged as enabling technologies for the manufacturing of multi- level metal interconnects used in high-density Integrated Circuits (IC). An overview of general planarization techniques for MicroElectroMechanical Systems (MEMS) and, in particular, the extension of CMP from sub-micron IC manufacturing to the fabrication of complex surface-micromachined MEMS will be presented. Planarization technique alleviates processing problems associated with fabrication of multi-level polysilicon structures, eliminates design constraints linked with non-planar topography, and provides an avenue for integrating different process technologies. The CMP process and present examples of the use of CMP in fabricating MEMS devices such as microengines, pressure sensors, and proof masses for accelerometers along with its use for monolithically integrating MEMS devices with microelectronics are presented.

  6. System architecture for mode-matching a MEMS gyroscope

    E-Print Network [OSTI]

    Wu, Henry, M. Eng. Massachusetts Institute of Technology

    2009-01-01

    MEMS gyroscopes are used to detect rotation rates and have enabled a variety of motion-based technologies in a range of industries. They are composed of micro-machined polysilicon structures that resonate and deflect when ...

  7. Control of a MEMS fast steering mirror for laser applications

    E-Print Network [OSTI]

    Lane, Joseph Kerivan

    2012-01-01

    A control system for a MEMS fast steering mirror is designed and implemented to accurately steer a laser beam. This document contains a characterization of important mirror characteristics and the full analysis of an analog ...

  8. GE MEMS for LTE Advanced Mobile Devices | GE Global Research

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

    MEMS Switch Technology Demonstrates Performance Which Could Meet Demands for Next-Generation "True 4G" Mobile Devices Click to email this to a friend (Opens in new window) Share on...

  9. Thin Silicon MEMS Contact-Stress Sensor

    SciTech Connect (OSTI)

    Kotovsky, J; Tooker, A; Horsley, D

    2010-03-22

    This thin, MEMS contact-stress (CS) sensor continuously and accurately measures time-varying, solid interface loads in embedded systems over tens of thousands of load cycles. Unlike all other interface load sensors, the CS sensor is extremely thin (< 150 {micro}m), provides accurate, high-speed measurements, and exhibits good stability over time with no loss of calibration with load cycling. The silicon CS sensor, 5 mm{sup 2} and 65 {micro}m thick, has piezoresistive traces doped within a load-sensitive diaphragm. The novel package utilizes several layers of flexible polyimide to mechanically and electrically isolate the sensor from the environment, transmit normal applied loads to the diaphragm, and maintain uniform thickness. The CS sensors have a highly linear output in the load range tested (0-2.4 MPa) with an average accuracy of {+-} 1.5%.

  10. MEMS inertial sensors with integral rotation means.

    SciTech Connect (OSTI)

    Kohler, Stewart M.

    2003-09-01

    The state-of-the-art of inertial micro-sensors (gyroscopes and accelerometers) has advanced to the point where they are displacing the more traditional sensors in many size, power, and/or cost-sensitive applications. A factor limiting the range of application of inertial micro-sensors has been their relatively poor bias stability. The incorporation of an integral sensitive axis rotation capability would enable bias mitigation through proven techniques such as indexing, and foster the use of inertial micro-sensors in more accuracy-sensitive applications. Fabricating the integral rotation mechanism in MEMS technology would minimize the penalties associated with incorporation of this capability, and preserve the inherent advantages of inertial micro-sensors.

  11. Mechanics and tribology of MEMS materials.

    SciTech Connect (OSTI)

    Prasad, Somuri V.; Dugger, Michael Thomas; Boyce, Brad Lee; Buchheit, Thomas Edward

    2004-04-01

    Micromachines have the potential to significantly impact future weapon component designs as well as other defense, industrial, and consumer product applications. For both electroplated (LIGA) and surface micromachined (SMM) structural elements, the influence of processing on structure, and the resultant effects on material properties are not well understood. The behavior of dynamic interfaces in present as-fabricated microsystem materials is inadequate for most applications and the fundamental relationships between processing conditions and tribological behavior in these systems are not clearly defined. We intend to develop a basic understanding of deformation, fracture, and surface interactions responsible for friction and wear of microelectromechanical system (MEMS) materials. This will enable needed design flexibility for these devices, as well as strengthen our understanding of material behavior at the nanoscale. The goal of this project is to develop new capabilities for sub-microscale mechanical and tribological measurements, and to exercise these capabilities to investigate material behavior at this size scale.

  12. Testing MEM with Diquark and thermal Meson Correlation Functions

    E-Print Network [OSTI]

    I. Wetzorke; F. Karsch

    2000-11-03

    When applying the maximum entropy method (MEM) to the analysis of hadron correlation functions in QCD a central issue is to understand to what extent this method can distinguish bound states, resonances and continuum contributions to spectral functions. We discuss these issues by analyzing meson and diquark correlation functions at zero temperature as well as free quark anti-quark correlators. The latter test the applicability of MEM to high temperature QCD.

  13. Flat Is Not Dead: Current and Future Performance of Si-MEMS Quad Mass Gyro (QMG) System

    E-Print Network [OSTI]

    Chen, Zhongping

    /Honeywell MEMS gyroscope and the majority of MEMS gyroscopes in the consumer electronics and automotive the drift of Class I CVGs is to mount the MEMS IMU on a gimbaled platform, which reorients the sensors

  14. Design of a Class of Antennas Utilizing MEMS, EBG and Septum Polarizers including Near-field Coupling Analysis

    E-Print Network [OSTI]

    Kim, Ilkyu

    2012-01-01

    inverted-F antenna with an RF MEMS switch for the correctionP. G. Steeneken, “A Five-band MEMS Switched PIFA for MobileApplications to Reconfigurable MEMS Filters,” in IEEE MTT-S

  15. High linearity 1.5-2.5 GHz RF-MEMS and varactor diodes based tunable filters for wireless applications

    E-Print Network [OSTI]

    El-Tanani, Mohammed Ahmed

    2009-01-01

    5.2.3 RF-MEMS Tunable Capacitive Network . . . . . . . .5.3Wide-Bandwidth Miniaturized RF-MEMS Tun- ableApplications104 Appendix B RF MEMS Cantilever Fabrication

  16. MEMS Reliability: Infrastructure, Test Structures, Experiments, and Failure Modes

    SciTech Connect (OSTI)

    TANNER,DANELLE M.; SMITH,NORMAN F.; IRWIN,LLOYD W.; EATON,WILLIAM P.; HELGESEN,KAREN SUE; CLEMENT,J. JOSEPH; MILLER,WILLIAM M.; MILLER,SAMUEL L.; DUGGER,MICHAEL T.; WALRAVEN,JEREMY A.; PETERSON,KENNETH A.

    2000-01-01

    The burgeoning new technology of Micro-Electro-Mechanical Systems (MEMS) shows great promise in the weapons arena. We can now conceive of micro-gyros, micro-surety systems, and micro-navigators that are extremely small and inexpensive. Do we want to use this new technology in critical applications such as nuclear weapons? This question drove us to understand the reliability and failure mechanisms of silicon surface-micromachined MEMS. Development of a testing infrastructure was a crucial step to perform reliability experiments on MEMS devices and will be reported here. In addition, reliability test structures have been designed and characterized. Many experiments were performed to investigate failure modes and specifically those in different environments (humidity, temperature, shock, vibration, and storage). A predictive reliability model for wear of rubbing surfaces in microengines was developed. The root causes of failure for operating and non-operating MEMS are discussed. The major failure mechanism for operating MEMS was wear of the polysilicon rubbing surfaces. Reliability design rules for future MEMS devices are established.

  17. Tomato chocolate spot virus, a member of a new torradovirus species that causes a necrosis-associated disease of tomato in Guatemala

    E-Print Network [OSTI]

    Batuman, O.; Kuo, Y.-W.; Palmieri, M.; Rojas, M. R.; Gilbertson, R. L.

    2010-01-01

    Tomato chocolate spot virus, a member of a new torradovirusRepublic of Guatemala this virus being the causal agent oflate-spot-associated virus, revealed a genome composed of

  18. MEMS packaging with etching and thinning of lid wafer to form lids and expose device wafer bond pads

    DOE Patents [OSTI]

    Chanchani, Rajen; Nordquist, Christopher; Olsson, Roy H; Peterson, Tracy C; Shul, Randy J; Ahlers, Catalina; Plut, Thomas A; Patrizi, Gary A

    2013-12-03

    In wafer-level packaging of microelectromechanical (MEMS) devices a lid wafer is bonded to a MEMS wafer in a predermined aligned relationship. Portions of the lid wafer are removed to separate the lid wafer into lid portions that respectively correspond in alignment with MEMS devices on the MEMS wafer, and to expose areas of the MEMS wafer that respectively contain sets of bond pads respectively coupled to the MEMS devices.

  19. Electrical power systems (Guatemala). Small generators and turbines, March 1992. Export trade information

    SciTech Connect (OSTI)

    Not Available

    1992-03-01

    In Guatemala the market for all types of electrical power generator systems, including parts and accessories, increased from US $19.5 million in 1990 to US $25.5 in 1991 (up 30.7 percent). Guatemalan import statistics list within this category all types of turbines and hydraulic electric power generating engines, regardless of their size or power generating capacity. Also included in the study are all types of electrical generators that are moved or operated by an attached fuel powered engine. The outlook for future market demand for electrical power generating systems looks promising for the next three or four years, with an estimated average increase of 7.3 percent per year.

  20. The direct application of geothermal energy to provide process heat in Guatemala

    SciTech Connect (OSTI)

    Altseimer, J.H.; Edeskuty, F.J.

    1987-09-01

    One part of an energy and resource development program in Central America is a geothermal process heat project in Guatemala. The feasibility of the direct heat application depends upon the production characteristics and reliability of the geothermal source. Other factors are the distance from the heat source, quantity of use, and capacity factor of the use facilities. Favorable conditions would be distances of under 5 km, heat requirements approximately equal to the well capacity, and high capacity factors (say 60% or higher) in the industrial plants. Depending upon the values of these factors, energy costs of less than $1.00/million Btus to greater than $5.00/million Btus have been estimated. This can be compared to about $5.00/million Btus for petroleum-based fuels in Guatemala in mid 1987. A survey was made of existing industries in the Amatitlan and Zunil geothermal areas. In both Amatitlan and Zunil the existing industries are spread out over an area too large to be called an optimum. The most promising situation for an industrial park development is at Amatitlan, except that proven production wells are not yet available. At Zunil, production wells exist, but a diverse nearby industrial base does not. However, both of these two areas are sufficiently promising to merit further development. Consequently, a demonstration project is underway aimed at the ultimate establishment of an agricultural processing center at Zunil. This center would have the capability to process agricultural products by dehydration, freezing, and cold storage. 2 refs., 4 figs., 2 tabs.

  1. Design, fabrication and testing of a lateral self-cleaning MEMS switch

    E-Print Network [OSTI]

    Shi, Yong, 1965-

    2004-01-01

    A lateral contact MEMS switch has been developed to address the need for a long life cycle, low contact resistance RF switch. At the present time, there is no commercial MEMS switch that meets all the requirements. The ...

  2. A MEMS Thin Film AlN Supercritical Carbon Dioxide Valve

    E-Print Network [OSTI]

    Chen, Ya-Mei

    2011-01-01

    and T. K. Tang, “MEMS micro-valve for space applications”,of the fabricated thermal MEMS valve by Kim et al. [An electrostatically actuated gas valve with an s-shape film

  3. Performance and characterization of a MEMS-based device for alignment...

    Office of Scientific and Technical Information (OSTI)

    of a MEMS-based device for alignment and manipulation of x-ray nanofocusing optics Title: Performance and characterization of a MEMS-based device for alignment and...

  4. INTEGRATED MEMS STRUCTURES AND CMOS CIRCUITS FOR BIOELECTRONIC INTERFACE WITH SINGLE CELLS

    E-Print Network [OSTI]

    Maryland at College Park, University of

    INTEGRATED MEMS STRUCTURES AND CMOS CIRCUITS FOR BIOELECTRONIC INTERFACE WITH SINGLE CELLS N of Maryland, College Park, Maryland 20742, USA {smela,pabshire}@glue.umd.edu ABSTRACT We describe a bioMEMS

  5. Acoustic Bragg Reflectors for Q-Enhancement of Unreleased MEMS Resonators

    E-Print Network [OSTI]

    Wang, Wentao

    This work presents the design of acoustic Bragg reflectors (ABRs) for unreleased MEMS resonators through analysis and simulation. Two of the greatest challenges to the successful implementation of MEMS are those of packaging ...

  6. High performance RF MEMS metal-contact switches and switching networks

    E-Print Network [OSTI]

    Patel, Chirag D.; Patel, Chirag D.

    2012-01-01

    3.2.1 Switch Overview . . . . . . . . . . . . . . . . . . .MEMS Switch and Networks . . . . . . . . . . . . . . . . . .4.1 Switch Design . . . . . . . . . . . . . . . . . . 4.2

  7. Testing of Critical Features of Polysilicon MEMS

    SciTech Connect (OSTI)

    LAVAN,DAVID A.; BUCHHEIT,THOMAS E.

    1999-12-02

    The behavior of MEMS devices is limited by the strength of critical features such as thin ligaments, oxide cuts joining layers, pin joints and hinges. Devices fabricated at Sandia's Microelectronic Development Laboratory have been successfully tested to investigate these features. A series of measurements were performed on samples with gage lengths of 15 to 1000 microns, using conventional and tungsten coated samples as well as samples that include the critical features of standard components in the test section. Specimens have a freely moving pin joint on one end that anchors the sample to the silicon die to allow rotation to reduce effects of bending. Each sample is loaded in uniaxial tension by pulling laterally with a flat tipped diamond in a computer-controlled Nanoindenter. Load is calculated by resolving the measured lateral and normal forces into the applied tensile force and frictional losses. The specimen cross section and gage length dimensions were verified by measuring against a standard in the SEM. Multiple tests can be programmed at one time and performed without operator assistance allowing the collection of significant populations of data.

  8. Differentially-driven MEMS spatial light modulator

    DOE Patents [OSTI]

    Stappaerts, Eddy A.

    2004-09-14

    A MEMS SLM and an electrostatic actuator associated with a pixel in an SLM. The actuator has three electrodes: a lower electrode; an upper electrode fixed with respect to the lower electrode; and a center electrode suspended and actuable between the upper and lower electrodes. The center electrode is capable of resiliently-biasing to restore the center electrode to a non-actuated first equilibrium position, and a mirror is operably connected to the center electrode. A first voltage source provides a first bias voltage across the lower and center electrodes and a second voltage source provides a second bias voltage across the upper and center electrodes, with the first and second bias voltages determining the non-actuated first equilibrium position of the center electrode. A third voltage source provides a variable driver voltage across one of the lower/center and upper/center electrode pairs in series with the corresponding first or second bias voltage, to actuate the center electrode to a dynamic second equilibrium position.

  9. Novel Fabrication and Simple Hybridization of Exotic Material MEMS

    SciTech Connect (OSTI)

    Datskos, P.G.; Rajic, S.

    1999-11-13

    Work in materials other than silicon for MEMS applications has typically been restricted to metals and metal oxides instead of more ''exotic'' semiconductors. However, group III-V and II-VI semiconductors form a very important and versatile collection of material and electronic parameters available to the MEMS and MOEMS designer. With these materials, not only are the traditional mechanical material variables (thermal conductivity, thermal expansion, Young's modulus, etc.) available, but also chemical constituents can be varied in ternary and quaternary materials. This flexibility can be extremely important for both friction and chemical compatibility issues for MEMS. In addition, the ability to continually vary the bandgap energy can be particularly useful for many electronics and infrared detection applications. However, there are two major obstacles associated with alternate semiconductor material MEMS. The first issue is the actual fabrication of non-silicon devices and the second impediment is communicating with these novel devices. We will describe an essentially material independent fabrication method that is amenable to most group III-V and II-VI semiconductors. This technique uses a combination of non-traditional direct write precision fabrication processes such as diamond turning, ion milling, laser ablation, etc. This type of deterministic fabrication approach lends itself to an almost trivial assembly process. We will also describe in detail the mechanical, electrical, and optical self-aligning hybridization technique used for these alternate-material MEMS.

  10. Computation of Electrostatic Properties of 3D MEMS Structures

    E-Print Network [OSTI]

    N. Majumdar; S. Mukhopadhyay

    2006-04-05

    Micro-Electro-Mechanical Systems (MEMS) normally have fixed or moving structures with cross-sections of the order of microns ($\\mu m$) and lengths of the order of tens or hundreds of microns. These structures are often plates or array of thin beams which, owing to their smallness, can be moved or deflected easily through the application of low voltages. Since electrostatic forces play a very major role in maneuvering these devices, a thorough understanding of the electrostatic properties of these structures is of critical importance, especially in the design phase of MEMS. In many cases, the electrostatic analysis of MEMS is carried out using boundary element method (BEM), while the structural analysis is carried out using finite element method (FEM). In this paper, we focus on accurate electrostatic analysis of MEMS using BEM. In particular, we consider the problem of computing the charge distribution and capacitance of thin conducting plates relevant to the numerical simulation of MEMS. The reason behind the accuracy of the solver is the fact that it uses closed-form analytic expressions that are valid seamlessly throughout the physical domain for computing the influence coefficients. Thus, it is possible to avoid one of the most serious approximations of the BEM, namely, the assumption that the effect of a charge distributed over a boundary element can be approximated by charge located at the centroid of the element. Comparison with other results available in the literature seems to indicate that the present results are more accurate than the existing ones.

  11. High Efficiency Optical MEMS by the Integration of Photonic Lattices with Surface MEMS

    SciTech Connect (OSTI)

    FLEMING, JAMES G.; LIN, SHAWN-YU; MANI, SEETHAMBAL S.; RODGERS, M. STEVEN; DAGEL, DARYL J.

    2002-11-01

    This report outlines our work on the integration of high efficiency photonic lattice structures with MEMS (MicroElectroMechanical Systems). The simplest of these structures were based on 1-D mirror structures. These were integrated into a variety of devices, movable mirrors, switchable cavities and finally into Bragg fiber structures which enable the control of light in at least 2 dimensions. Of these devices, the most complex were the Bragg fibers. Bragg fibers consist of hollow tubes in which light is guided in a low index media (air) and confined by surrounding Bragg mirror stacks. In this work, structures with internal diameters from 5 to 30 microns have been fabricated and much larger structures should also be possible. We have demonstrated the fabrication of these structures with short wavelength band edges ranging from 400 to 1600nm. There may be potential applications for such structures in the fields of integrated optics and BioMEMS. We have also looked at the possibility of waveguiding in 3 dimensions by integrating defects into 3-dimensional photonic lattice structures. Eventually it may be possible to tune such structures by mechanically modulating the defects.

  12. C O L L E G E O F A RT S & S C I E N C EV A N D E R B I L T U N I V E R S I T Y n a remote jungle of Guatemala, Professor

    E-Print Network [OSTI]

    Wikswo, John

    of Guatemala, Professor Arthur Demarest and his team of Vanderbilt and Guatemalan archeologists have uncov in Guatemala (please see sidebar, page 4). The Cancuén research might cause scholars to revise their views

  13. The Impact of Emerging MEMS-Based Microsystems on US Defense Applications

    SciTech Connect (OSTI)

    STAPLE,BEVAN D.; JAKUBCZAK II,JEROME F.

    2000-01-20

    This paper examines the impact of inserting Micro-Electro-Mechanical Systems (MEMS) into US defense applications. As specific examples, the impacts of micro Inertial Measurement Units (IMUs), radio frequency MEMS (RF MEMS), and Micro-Opto-Electro-Mechanical Systems (MOEMS) to provide integrated intelligence, communication, and control to the defense infrastructure with increased affordability, functionality, and performance are highlighted.

  14. OPTO-ACOUSTIC OSCILLATOR USING SILICON MEMS OPTICAL MODULATOR Suresh Sridaran and Sunil A. Bhave

    E-Print Network [OSTI]

    Afshari, Ehsan

    is chosen for oscillation by the RF filter. The superior phase noise is due to the long energy storage timesOPTO-ACOUSTIC OSCILLATOR USING SILICON MEMS OPTICAL MODULATOR Suresh Sridaran and Sunil A. Bhave OxideMEMS Lab, Cornell University, Ithaca, NY, USA ABSTRACT We show operation of a silicon MEMS based

  15. ARTICLE IN PRESS BioMEMS: state-of-the-art in detection,

    E-Print Network [OSTI]

    Bashir, Rashid

    or Biological Micro-Electro-Mechanical Systems [BioMEMS]) have become increasingly prevalent and have found . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 1. Introduction and BioMEMS defined Since the inception of micro-electro-mechanical systemsARTICLE IN PRESS BioMEMS: state-of-the-art in detection, opportunities and prospects Rashid Bashir

  16. A System for Calibration and Reliability Testing of MEMS Devices Under Mechanical Stress

    E-Print Network [OSTI]

    Polian, Ilia

    ), University of Freiburg, Germany Abstract Microelectromechanical systems (MEMS) are employed in safety Introduction Microelectromechanical systems (MEMS) are em- ployed in safety-critical fields such as automotiveA System for Calibration and Reliability Testing of MEMS Devices Under Mechanical Stress S. Spinner

  17. Motivation Measuring Speedup Parallel Out of Mem Automation Introduction to High-Performance R

    E-Print Network [OSTI]

    Pudlo, Pierre

    Motivation Measuring Speedup Parallel Out of Mem Automation Introduction to High-Performance R Use-Performance R / UseR! 2008 Tutorial #12;Motivation Measuring Speedup Parallel Out of Mem Automation Motivation Speedup Parallel Out of Mem Automation Motivation cont. Roadmap: We will start by measuring how we

  18. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 16, NO. 5, OCTOBER 2007 1185 RF MEMS Sequentially Reconfigurable Sierpinski

    E-Print Network [OSTI]

    Tentzeris, Manos

    JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 16, NO. 5, OCTOBER 2007 1185 RF MEMS Sequentially, RF microelectromechanical systems (RF MEMS), Sierpinski fractal antenna. I. INTRODUCTION THE RF microelectromechanical systems (RF MEMS) switches are quickly becoming a popular switching ele- ment among microwave

  19. MEM Project Guidelines revised 6/25/09 Master of Environmental Management

    E-Print Network [OSTI]

    MEM Project Guidelines revised 6/25/09 Master of Environmental Management Project Guidelines (MEM) degree is completion of a project. This element of the curriculum serves to integrate coursework and presents the results of the project to an appropriate audience. Project Committee: MEM students

  20. 3D MEMS Simulation Modeling Using Modified Nodal Analysis J. V. Clark, N. Zhou, D. Bindel,

    E-Print Network [OSTI]

    California at Berkeley, University of

    3D MEMS Simulation Modeling Using Modified Nodal Analysis J. V. Clark, N. Zhou, D. Bindel, L, and experimental verification of several MEMS devices are presented. Simulated results include 3D mode analysis. To simulate the performance of these MEMS devices a modified nodal analysis approach is used to formulate

  1. MEMS Deformable Mirrors for Astronomical Adaptive Optics S.A. Cornelissen1

    E-Print Network [OSTI]

    Bifano, Thomas

    on the development of high actuator count, micro-electromechanical (MEMS) deformable mirrors designed for high order Microelectromechanical systems (MEMS) based deformable mirrors (DMs) are an emerging class of wavefront correctors usedMEMS Deformable Mirrors for Astronomical Adaptive Optics S.A. Cornelissen1 , A.L. Hartzell1 , J

  2. MEMS Needle-type Sensor Array for in Situ Measurements of Dissolved

    E-Print Network [OSTI]

    Papautsky, Ian

    a multisensor device (1, 5, 16-18). Microelectromechanical systems (MEMS) technologies permit the integrationMEMS Needle-type Sensor Array for in Situ Measurements of Dissolved Oxygen and Redox Potential J I systems (MEMS) technologies. The MEA exhibits fast response times for both DO and ORP measurements

  3. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 22, NO. 6, DECEMBER 2013 1257 What is MEMS Gyrocompassing? Comparative

    E-Print Network [OSTI]

    Chen, Zhongping

    JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 22, NO. 6, DECEMBER 2013 1257 What is MEMS an in-house developed vibratory silicon MEMS quadruple mass gyroscope (QMG). We instru- mented a vacuum a simple turn table, but requires calibration due to temperature-induced drifts. [2012-0378] Index Terms--MEMS

  4. CEE 812 Structural Engineering Seminar Series A Family of MEMS Sensors

    E-Print Network [OSTI]

    Kamat, Vineet R.

    CEE 812 ­ Structural Engineering Seminar Series A Family of MEMS Sensors for Redundant Structural multiple MEMS sensors on the same package tackles several limitations of the SHM methods such as the need wave problem, nonlinear ultrasonics for stress measurement of thick plates, MEMS sensors for multi-sensor

  5. UNIVERSITY OF CALGARY Integration of WiFi and MEMS Sensors for Indoor Navigation

    E-Print Network [OSTI]

    Calgary, University of

    UNIVERSITY OF CALGARY Integration of WiFi and MEMS Sensors for Indoor Navigation by Yuan Zhuang of MEMS sensors and WiFi offer an efficient integration for indoor navigation applications. Two automatic-coupled) integration and TC (Tightly-coupled) integration are implemented for WiFi and MEMS sensors to further limit

  6. Effect of cubic nonlinearity on auto-parametrically amplified resonant MEMS mass sensor

    E-Print Network [OSTI]

    Effect of cubic nonlinearity on auto-parametrically amplified resonant MEMS mass sensor Wenhua. Keywords: Mass sensor; Chemical sensor; Nonlinearity; Parametric resonance; Damping; Mathieu equation; MEMS detection [10­12], etc. cantilever-based MEMS sensors have been utilized. Micro- scale oscillators

  7. Origami-like Folded MEMS for Realization of TIMU: Fabrication Technology and Initial

    E-Print Network [OSTI]

    Chen, Zhongping

    single-axis sensors and then folding them into a 3-D Fig. 1. Commercial MEMS IMUs Performance Fig. 2 for assembly of the integrated MEMS sensor cluster in a 3-D configuration, or folding in a 3-D shape. FoldedOrigami-like Folded MEMS for Realization of TIMU: Fabrication Technology and Initial Demonstration

  8. Bio-inspired MEMS Pressure and Flow Sensors for Underwater Navigation and Object Imaging "

    E-Print Network [OSTI]

    Bio-inspired MEMS Pressure and Flow Sensors for Underwater Navigation and Object Imaging " MIT. - A. G. P. Kottapalli et. al., "Liquid crystal polymer membrane MEMS sensor for flow rate and flow for waterproofing. Fabrication Kayak Testing Commercial Sensors (Reference) MEMS Sensor When mounted on the side

  9. Nondestructive Monitoring of a Pipe Network using a MEMS-Based Wireless Network

    E-Print Network [OSTI]

    Shinozuka, Masanobu

    , MEMS sensors, ruptures, wireless sensor network 1. INTRODUCTION Pressurized pipeline systems-electro-mechanical systems (MEMS)-based wireless sensor network (WSN). It is composed of sensing nodes, each of which for data uplink. A sensor board is equipped with MEMS accelerometers for measuring vibration

  10. > REPLACE THIS LINE WITH YOUR PAPER IDENTIFICATION NUMBER (DOUBLE-CLICK HERE TO EDIT) MEMS Switches

    E-Print Network [OSTI]

    De Flaviis, Franco

    Monolithic Integration of RF MEMS Switches With a Diversity Antenna on PCB Substrate B. A. Cetiner, J. Y integration of RF MEMS switches with three-dimensional (3-D) antenna elements on a microwave laminate printed applications. A two- element diversity antenna system monolithically integrated with RF MEMS switches

  11. Development of a 4096 Element MEMS Continuous Membrane Deformable Mirror for High Contrast

    E-Print Network [OSTI]

    Bifano, Thomas

    Development of a 4096 Element MEMS Continuous Membrane Deformable Mirror for High Contrast star. This surface micromachined MEMS deformable mirror will have an active aperture of 25.2mm developed for commercially available 1024 and 140 element MEMS deformable mirrors to achieve unprecedented

  12. MEMS Deformable Mirror Actuators with Enhanced Reliability S.A. Cornelissena

    E-Print Network [OSTI]

    Bifano, Thomas

    MEMS Deformable Mirror Actuators with Enhanced Reliability S.A. Cornelissena , T.G. Bifanoa,b , P, 15 St. Mary's St., Boston, MA 02215 ABSTRACT MEMS deformable mirrors with thousands of actuators due to electrical overstress. We report on advances made in the development of MEMS deformable mirror

  13. Modeling and Design of RF MEMS Structures Using Computationally Efficient Numerical Techniques

    E-Print Network [OSTI]

    Tentzeris, Manos

    Modeling and Design of RF MEMS Structures Using Computationally Efficient Numerical Techniques N. A Abstract The modeling of MEMS structures using MRTD is presented. Many complex RF structures have been communication systems efficiently and accurately. Specifically, micromachined structures such as MEMS

  14. Requirements for MEMS Mirrors for Adaptive Optics in the Elizabeth Daly, Eugenie Dalimier and Chris Dainty

    E-Print Network [OSTI]

    Dainty, Chris

    Requirements for MEMS Mirrors for Adaptive Optics in the Eye Elizabeth Daly, Eugenie Dalimier, Galway, Ireland. ABSTRACT MEMS is one of several emerging technologies for fabricating wavefront mirrors, including a 12x12 MEMS device. The key point is that it is the effectiveness of each actuator

  15. Processor-Embedded Distributed MEMS-Based Storage Systems for High-Performance I/O

    E-Print Network [OSTI]

    Processor-Embedded Distributed MEMS-Based Storage Systems for High-Performance I/O Steve C. Chiu new data organization and access character- istics, MEMS-based storage devices have come under con production, MEMS-based storage devices have outperformed disks in device-level simulations. Processor

  16. Rapid Earthquake Characterization Using MEMS Accelerometers and Volunteer Hosts Following the M 7.2 Darfield,

    E-Print Network [OSTI]

    Allen, Richard M.

    Rapid Earthquake Characterization Using MEMS Accelerometers and Volunteer Hosts Following the M 7. Small low-cost ($30­$3000) microelectrome- chanical systems (MEMS) triaxial sensors provide ground of cyber-social-seismic network. In the QCN architecture, MEMS sensors are con- nected directly

  17. MN 555 MEMS: Fabrication and Materials Spring 2004 Department of Manufacturing Engineering

    E-Print Network [OSTI]

    Lin, Xi

    MN 555 MEMS: Fabrication and Materials Spring 2004 Instructor Xin Zhang Department of Manufacturing meetings by appointment) 2003-2004 Catalog Data: MN 555 MEMS: Fabrication and Materials This course will explore the world of microelectromechanical devices and systems (MEMS). This requires an awareness

  18. MEMS-based Disk Buffer for Streaming Media Servers Raju Rangaswami

    E-Print Network [OSTI]

    Rangaswami, Raju

    MEMS-based Disk Buffer for Streaming Media Servers Raju Rangaswami raju@cs.ucsb.edu Zoran of large DRAM buffers to im- prove the overall streaming throughput. MEMS-based stor- age is an exciting on the class of streaming media applications. We evaluate the use of MEMS-based storage for buffering

  19. Designing Computer Systems With MEMS-based Storage Steven W. Schlosser, John Linwood Grin,

    E-Print Network [OSTI]

    Designing Computer Systems With MEMS-based Storage Steven W. Schlosser, John Linwood GriÆn, David F architects. An exciting new storage technology based on microelectromechanical systems (MEMS) is poised many new classes of applications. This research explores the impact that several di#11;erent MEMS

  20. Modeling of Large Scale RF-MEMS Circuits Using Efficient Time-Domain Techniques

    E-Print Network [OSTI]

    Tentzeris, Manos

    Modeling of Large Scale RF-MEMS Circuits Using Efficient Time-Domain Techniques N. Bushyager, E Engineering Georgia Institute of Technology Atlanta, GA 30332-0250, USA Abstract RF-MEMS design is made difficult due to the lack of tools capable of simulating both MEMS devices and their surrounding circuits

  1. MEMS Design Synthesis: Integrating Case-based Reasoning and Multi-objective Genetic Algorithms

    E-Print Network [OSTI]

    Agogino, Alice M.

    MEMS Design Synthesis: Integrating Case-based Reasoning and Multi-objective Genetic Algorithms-Electro-Mechanical Systems (MEMS) design tool that uses a multi-objective genetic algorithm (MOGA) to synthesize and optimize conceptual designs. CBR utilizes previously successful MEMS designs and sub-assemblies as building blocks

  2. Ferroelectric PZT RF MEMS Resonators Jeffrey S. Pulskamp, Sarah S. Bedair, Ronald G.

    E-Print Network [OSTI]

    Afshari, Ehsan

    Ferroelectric PZT RF MEMS Resonators Jeffrey S. Pulskamp, Sarah S. Bedair, Ronald G. Polcawich- piezoelectric lead zirconate titanate (PZT) RF MEMS resonators. Several research topics are introduced including (~117dB) parallel resonant mode with DC bias tunable rejection, a MEMS support design for the mitigation

  3. Statistical Design and Optimization for Adaptive Post-silicon Tuning of MEMS Filters

    E-Print Network [OSTI]

    Li, Xin

    Statistical Design and Optimization for Adaptive Post-silicon Tuning of MEMS Filters Fa Wang, Gokce of microelectro-mechanical systems (MEMS) for RF (radio frequency) applications. In this paper we describe a novel technique of adaptive post-silicon tuning to reliably design MEMS filters that are robust to process

  4. Nonlocal Problems in MEMS Device Control J.A.Pelesko pelesko@math.gatech.edu

    E-Print Network [OSTI]

    Pelesko, John

    Nonlocal Problems in MEMS Device Control J.A.Pelesko pelesko@math.gatech.edu Georgia Institute the most ubiquitous phenomena associated with electrostati- cally actuated MEMS devices is the pull, a mathematical model of an idealized electrostatically actuated MEMS device is constructed for the purpose

  5. RF-MEMS Capacitive Series Switches of CPW & MSL Configurations for Reconfigurable Antenna Application

    E-Print Network [OSTI]

    De Flaviis, Franco

    RF-MEMS Capacitive Series Switches of CPW & MSL Configurations for Reconfigurable Antenna, University of California Irvine, Irvine, CA, 92697 Abstract: The air-bridged RF-MEMS switches in single pole) and coplanar waveguide (CPW) structures. RF-MEMS series switches are monolithic fabricated in both transmission

  6. SI-BASED UNRELEASED HYBRID MEMS-CMOS RESONATORS IN 32NM TECHNOLOGY

    E-Print Network [OSTI]

    Reif, Rafael

    SI-BASED UNRELEASED HYBRID MEMS-CMOS RESONATORS IN 32NM TECHNOLOGY Radhika Marathe*, Wentao Wang*, and Dana Weinstein HybridMEMS Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA *authors before the presence of parasitics. This enables RF-MEMS resonators at orders of magnitude higher

  7. A 100 MHz MEMS SiBAR Phase Modulator for Quadrature Phase Shift Keying

    E-Print Network [OSTI]

    Ayazi, Farrokh

    A 100 MHz MEMS SiBAR Phase Modulator for Quadrature Phase Shift Keying Logan Sorenson and Farrokh of a MEMS resonator to form the basic component of a switchless quadrature phase shift keying (QPSK) scheme. INTRODUCTION In recent years, microelectromechanical systems (MEMS)- based solutions have gained acceptance

  8. Through-Wafer Interconnects for High Degree of Freedom MEMS Deformable Mirrors

    E-Print Network [OSTI]

    Bifano, Thomas

    Through-Wafer Interconnects for High Degree of Freedom MEMS Deformable Mirrors Alioune Diouf 1 Spinelli Place, Cambridge, MA 02138 Abstract The development of an assembly and packaging process for MEMS University MEMS DMs are surface-micromachined polysilicon double-cantilever actuator architecture

  9. Wavelength selection in MEMS tunable vertical-cavity SOAs Garrett Cole1

    E-Print Network [OSTI]

    MacDonald, Noel C.

    Wavelength selection in MEMS tunable vertical-cavity SOAs Garrett Cole1 , Qi Chen2 , Staffan: gcole@engineering.ucsb.edu Abstract: We analyze the tuning characteristics of MEMS tunable vertical promising method is microelectromechanical (MEMS) tuning. In this case mechanical alteration of the resonant

  10. PHASE NOISE PERFORMANCE COMPARISON BETWEEN LIGA-MEMS AND ON-CHIP CMOS CAPACITORS

    E-Print Network [OSTI]

    Saskatchewan, University of

    PHASE NOISE PERFORMANCE COMPARISON BETWEEN LIGA-MEMS AND ON-CHIP CMOS CAPACITORS FOR A VCO between the VCO using a new type of MEMS vari- able capacitor and that using conventional CMOS varactor, which is built on-chip together with the CMOS VCO. A representative MEMS variable capacitor, fabricated

  11. Modeling and Scheduling of MEMS-Based Storage Devices John Linwood Grin, Steven W. Schlosser,

    E-Print Network [OSTI]

    Modeling and Scheduling of MEMS-Based Storage Devices John Linwood GriÆn, Steven W. Schlosser University Pittsburgh, PA 15213 Abstract MEMS-based storage devices are seen by many as promising replacements for disk drives. Fabricated on CMOS, MEMS-based storage uses thousands of small, mechanical probe

  12. Nonlocal Problems in MEMS Device Control J.A. Pelesko* and A.A. Triolo**

    E-Print Network [OSTI]

    Pelesko, John

    Nonlocal Problems in MEMS Device Control J.A. Pelesko* and A.A. Triolo** *Georgia Institute associated with electrostaticallyactuated MEMS devices is the pull- in" voltage instability electrostatically actuated MEMS device is constructed for the purpose of analyzingvarious schemes proposed

  13. Modeling and Optimization of RF-MEMS Reconfigurable Tuners with Computationally Efficient Time-Domain Techniques

    E-Print Network [OSTI]

    Tentzeris, Manos

    Modeling and Optimization of RF-MEMS Reconfigurable Tuners with Computationally Efficient Time of Technology, Atlanta, GA 30332 2 Raytheon Company, Tucson AZ, 85734 Abstract -- Modern RF-MEMS device design methods in which the FDTD technique can be used to model a reconfigurable RF-MEMS tuner. A new method

  14. How much power from MEMS windmills? January 20, 2014 // Peter Clarke

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    How much power from MEMS windmills? January 20, 2014 // Peter Clarke A University of Texas Arlington research team has enjoyed considerable publicity for its development of a MEMS windmill of the photographs or the Youtube video of the prototype MEMS windmill, is any electrical wiring. Similarly

  15. Identification of Residual Stress State in an RF-MEMS Device

    E-Print Network [OSTI]

    Espinosa, Horacio D.

    Identification of Residual Stress State in an RF-MEMS Device l Horacio D. Espinosa, M. Fischer Dept Microelectromechanical Systems (MEMS) are among the most significant technological advances of this decade. The objective is of a few nanometers. The study of "thin films" and "ultra thin films" employed in MEMS devices is being

  16. Low Profile Packaging for MEMS Aero-acoustic Sensors John R. Burns1

    E-Print Network [OSTI]

    White, Robert D.

    Low Profile Packaging for MEMS Aero-acoustic Sensors John R. Burns1 , Robert D. White1 , and Joshua 02155 Abstract: This paper describes a semi-automated conductive ink process used for packaging MEMS devices. The method is applied to packaging of MEMS sensors for wind tunnel testing. The primary advantage

  17. Role of oxide thickening in fatigue crack initiation in LIGA nickel MEMS thin films

    E-Print Network [OSTI]

    Shan, Wanliang

    Role of oxide thickening in fatigue crack initiation in LIGA nickel MEMS thin films W.L. Shan a 2012 Accepted 16 October 2012 Available online 24 October 2012 Keywords: LIGA Ni MEMS thin films Oxide micro-electro-mechanical-systems (MEMS) structures. & 2012 Elsevier B.V. All rights reserved. 1

  18. Two-axis MEMS scanner with transfer-printed high-reflectivity, broadband monolithic silicon

    E-Print Network [OSTI]

    Rogers, John A.

    Two-axis MEMS scanner with transfer-printed high-reflectivity, broadband monolithic silicon@illinois.edu Abstract: We present a two-axis electrostatic MEMS scanner with high- reflectivity monolithic. The reflective surfaces of the MEMS scanner are transfer-printed PC mirrors with low polarization dependence, low

  19. Non-autonomous saddle-node bifurcation in a canonical electrostatic MEMS

    E-Print Network [OSTI]

    Arias, Cristina M.

    Non-autonomous saddle-node bifurcation in a canonical electrostatic MEMS Alexander Gutiérrez of electrostatically actuated micro-electro-mechanical system (MEMS) by means of classical topological techniques like of electrostatically actuated micro-electro-mechanical system (MEMS) which has become canonical in the related

  20. System-Level Synthesis of MEMS via Genetic Programming and Bond Graphs

    E-Print Network [OSTI]

    Hu, Jianjun

    System-Level Synthesis of MEMS via Genetic Programming and Bond Graphs Zhun Fan+ , Kisung Seo for automatic synthesis of MEMS system-level lumped parameter models using genetic programming and bond graphs. This paper first dis- cusses the necessity of narrowing the problem of MEMS synthesis into a certain specific

  1. Reliability of Capacitive RF MEMS Switches at High and Low Temperatures

    E-Print Network [OSTI]

    Espinosa, Horacio D.

    Reliability of Capacitive RF MEMS Switches at High and Low Temperatures Yong Zhu, Horacio D 60208-3111 Received 1 September 2003; accepted 24 February 2003 ABSTRACT: Some applications of RF MEMS temperatures in the range 60°C to 100°C are envisioned. The basic operation of a capacitive MEMS switch

  2. Low Cost RF MEMS Switches Fabricated on Microwave Laminate Printed Circuit Boards

    E-Print Network [OSTI]

    De Flaviis, Franco

    1 Low Cost RF MEMS Switches Fabricated on Microwave Laminate Printed Circuit Boards Hung-Pin Chang process for directly constructing RF MEMS capacitive switches has been developed on microwave laminate among components. Index Terms--RF MEMS switches, compressive molding planarization, high density

  3. Towards Understanding Architectural Tradeoffs in MEMS Closed-Loop Feedback Control

    E-Print Network [OSTI]

    Sherwood, Tim

    Towards Understanding Architectural Tradeoffs in MEMS Closed-Loop Feedback Control Greg Hoover, California 93106 sherwood@cs.ucsb.edu ABSTRACT Micro-Electro-Mechanical Systems (MEMS) combine litho on the scale of microns. However, the physical scale of MEMS devices can make controlling them computationally

  4. Tuning of MEMS devices using Evolutionary Computation and Open-Loop Frequency Response.

    E-Print Network [OSTI]

    Arizona, University of

    1 Tuning of MEMS devices using Evolutionary Computation and Open-Loop Frequency Response. Didier.keymeulen@jpl.nasa.gov Abstract-- 12 We propose a tuning method for MEMS gyroscopes based on evolutionary computation that has the capacity to efficiently increase the sensitivity of MEMS gyroscopes through tuning and, furthermore

  5. 2/3/2014 How much power from MEMS windmills? -Electronics Eetimes http://www.electronics-eetimes.com/en/how-much-power-from-mems-windmills-63.html?cmp_id=7&news_id=222919711 1/4

    E-Print Network [OSTI]

    Chiao, Jung-Chih

    2/3/2014 How much power from MEMS windmills? - Electronics Eetimes http://www.electronics-eetimes.com/en/how-much-power-from-mems-windmills 2014? Five lessons from Lenovo's Motorola deal How much power from MEMS windmills? January 20, 2014 development of a MEMS windmill that the developers have said could, when produced in array, provide energy

  6. Chemical-mechanical polishing: Enhancing the manufacturability of MEMS

    SciTech Connect (OSTI)

    Sniegowski, J.J.

    1996-10-01

    The planarization technology of Chemical-Mechanical-Polishing (CMP), used for the manufacturing of multi-level metal interconnects for high-density Integrated Circuits (IC), is also readily adaptable as an enabling technology in Micro Electro Mechanical Systems (MEMS) fabrication, particularly polysilicon surface micromachining. CMP not only eases the design and manufacturability of MEMS devices by eliminating several photolithographic and film issues generated by severe topography, but also enables far greater flexibility with process complexity and associated designs. Thus, the CMP planarization technique alleviates processing problems associated with fabrication of multi-level polysilicon structures, eliminates design constraints linked with non-planar topography, and provides an avenue for integrating different process technologies. Examples of these enhancements include: an simpler extension of surface micromachining fabrication to multiple mechanical layers, a novel method of monolithic integration of electronics and MEMS, and a novel combination of bulk and surface micromachining.

  7. MEMS: A new approach to micro-optics

    SciTech Connect (OSTI)

    Sniegowski, J.J.

    1997-12-31

    MicroElectroMechanical Systems (MEMS) and their fabrication technologies provide great opportunities for application to micro-optical systems (MOEMS). Implementing MOEMS technology ranges from simple, passive components to complicated, active systems. Here, an overview of polysilicon surface micromachining MEMS combined with optics is presented. Recent advancements to the technology, which may enhance its appeal for micro-optics applications are emphasized. Of all the MEMS fabrication technologies, polysilicon surface micromachining technology has the greatest basis in and leverages the most the infrastructure for silicon integrated circuit fabrication. In that respect, it provides the potential for very large volume, inexpensive production of MOEMS. This paper highlights polysilicon surface micromachining technology in regards to its capability to provide both passive and active mechanical elements with quality optical elements.

  8. SAMPLE (Sandia Agile MEMS Prototyping, Layout tools, and Education)

    SciTech Connect (OSTI)

    Davies, B.R.; Barron, C.C.; Sniegowski, J.J.; Rodgers, M.S.

    1997-08-01

    The SAMPLE (Sandia Agile MEMS Protyping, Layout tools, and Education) service makes Sandia`s state-of-the-art surface-micromachining fabrication process, known as SUMMiT, available to US industry for the first time. The service provides a short cause and customized computer-aided design (CAD) tools to assist customers in designing micromachine prototypes to be fabricated in SUMMiT. Frequent small-scale manufacturing runs then provide SAMPLE designers with hundreds of sophisticated MEMS (MicroElectroMechanical Systems) chips. SUMMiT (Sandia Ultra-planar, Multi-level MEMS Technology) offers unique surface-micromachining capabilities, including four levels of polycrystalline silicon (including the ground layer), flanged hubs, substrate contacts, one-micron design rules, and chemical-mechanical polishing (CMP) planarization. This paper describes the SUMMiT process, design tools, and other information relevant to the SAMPLE service and SUMMiT process.

  9. Finite Element Modeling of Micromachined MEMS Photon Devices

    SciTech Connect (OSTI)

    Datskos, P.G.; Evans, B.M.; Schonberger, D.

    1999-09-20

    The technology of microelectronics that has evolved over the past half century is one of great power and sophistication and can now be extended to many applications (MEMS and MOEMS) other than electronics. An interesting application of MEMS quantum devices is the detection of electromagnetic radiation. The operation principle of MEMS quantum devices is based on the photoinduced stress in semiconductors, and the photon detection results from the measurement of the photoinduced bending. These devices can be described as micromechanical photon detectors. In this work, we have developed a technique for simulating electronic stresses using finite element analysis. We have used our technique to model the response of micromechanical photon devices to external stimuli and compared these results with experimental data. Material properties, geometry, and bimaterial design play an important role in the performance of micromechanical photon detectors. We have modeled these effects using finite element analysis and included the effects of bimaterial thickness coating, effective length of the device, width, and thickness.

  10. 332 IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 51, NO. 1, JANUARY 2003 Monolithic Integration of RF MEMS Switches

    E-Print Network [OSTI]

    Cetiner, Bedri A.

    Integration of RF MEMS Switches With a Diversity Antenna on PCB Substrate B. A. Cetiner, Member, IEEE, J. Y integration of RF mi- croelectromechanical system (MEMS) switches with three-dimen- sional antenna elements with RF MEMS switches is designed and demonstrated. Index Terms--RF microelectromechanical system (MEMS

  11. MEMS/NEMS Design Automation and Synthesis Annual Report for NSF Grant # CCR-DES/CC-0306557

    E-Print Network [OSTI]

    Agogino, Alice M.

    1 MEMS/NEMS Design Automation and Synthesis Annual Report for NSF Grant # CCR-DES/CC-0306557 (2004: The goal of the project is to extend the existing SUGAR MEMS simulator into a design synthesis tool that supports the early stages of MEMS/NEMS conceptual design. We are developing a broad base of MEMS building

  12. MEMS/NEMS Design Automation and Synthesis Annual Report for NSF Grant # CCR-DES/CC-0306557

    E-Print Network [OSTI]

    Agogino, Alice M.

    1 MEMS/NEMS Design Automation and Synthesis Annual Report for NSF Grant # CCR-DES/CC-0306557 (2005: The goal of the project is to extend the existing SUGAR MEMS simulator into a design synthesis tool that supports the early stages of MEMS/NEMS conceptual design. We are developing a broad base of MEMS building

  13. Vibration Combined High Temperature Cycle Tests for Capacitive MEMS Accelerometers

    E-Print Network [OSTI]

    Z. Szucs; G. Nagy; S. Hodossy; M. Rencz; A. Poppe

    2008-01-07

    In this paper vibration combined high temperature cycle tests for packaged capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to provide useful Design for Reliability information for MEMS designers. A high temperature test chamber and a chopper-stabilized read-out circuitry were designed and realized at BME - DED. Twenty thermal cycles of combined Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5 samples. Statistical evaluation of the test results showed that degradation has started in 3 out of the 5 samples.

  14. APPLICATION OF MILLISECOND PULSED LASER WELDING IN MEMS P. Bozorgi*

    E-Print Network [OSTI]

    MacDonald, Noel C.

    APPLICATION OF MILLISECOND PULSED LASER WELDING IN MEMS PACKAGING P. Bozorgi* , C.B. Burgner, Z:YAG pulsed laser is used as a localized heating source to micro-weld a 350 µm titanium cap to the substrate distortion of the welding, several geometries at the cap and substrate interface were investigated

  15. MEMSNANO-2005 International conference on MEMS and Semiconductor Nanotechnology

    E-Print Network [OSTI]

    Mishra, Prabhat

    in place of polycrystalline metal oxide lead to large increase of free surface energy which in turn leads-22,2005,IIT Kharagpur,India MEMS BASED NANOCRYSTALLINE METAL OXIDE GAS SENSORS FOR COALMINE ENVIRONMENT P Metal Oxide gas sensors commonly used for sensing inflammable hydrocarbon gases and other toxic gases

  16. Rehabilitation program faculty mem-bers Chow Lam, Patrick Corrigan,

    E-Print Network [OSTI]

    Heller, Barbara

    Rehabilitation program faculty mem- bers Chow Lam, Patrick Corrigan, and Jon Larson, and Institute in rehabilitation and education. There are very few universities in China that offer studies on rehabili- tation psychology, and Lam believes IIT's MOU with CAS and his efforts in training future rehabilitation pro

  17. Enhanced Performance of Micro-Electro-Mechanical-Systems (MEMS) Microbial

    E-Print Network [OSTI]

    Cincinnati, University of

    the energy-climate cri- sis and environmental pollution, microbial fuel cells (MFCs) are a major focusEnhanced Performance of Micro-Electro- Mechanical-Systems (MEMS) Microbial Fuel Cells Using as a potential source for renewable energy production. A MFC can transform the chemical energy of bio- degradable

  18. Hidden Challenges to MEMS Commercialization: Design Realization and Reliability Assurance

    SciTech Connect (OSTI)

    McWhorter, P.J.; Miller, S.L.; Miller, W.M.; Rodger, M.S.; Yarberry, V.R.

    1999-01-20

    The successful commercialization of MicroElectroMechanical Systems (MEMS) is an essential prerequisite for their implementation in many critical government applications. Several unique challenges must be overcome to achieve this widespread commercialization. Challenges associated with design realization and reliability assurance are discussed, along with approaches taken by Sandia to successfully overcome these challenges.

  19. Characterization of a MEMS Accelerometer for Inertial Navigating Applications

    SciTech Connect (OSTI)

    Kinney, R.D.

    1999-02-12

    Inertial MEMS sensors such as accelerometers and angular rotation sensing devices continue to improve in performance as advances in design and processing are made. Present state-of-the-art accelerometers have achieved performance levels in the laboratory that are consistent with requirements for successful application in tactical weapon navigation systems. However, sensor performance parameters that are of interest to the designer of inertial navigation systems are frequently not adequately addressed by the MEMS manufacturer. This paper addresses the testing and characterization of a MEMS accelerometer from an inertial navigation perspective. The paper discusses test objectives, data reduction techniques and presents results from the test of a three-axis MEMS accelerometer conducted at Sandia National Laboratories during 1997. The test was structured to achieve visibility and characterization of the accelerometer bias and scale factor stability overtime and temperature. Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the US Department of Energy under contract DE-AC04-94AL85000.

  20. Piezoresistive and Piezoelectric MEMS Strain Sensors for Vibration Detection

    E-Print Network [OSTI]

    Horowitz, Roberto

    , vibration 1. INTRODUCTION Vibrations are a common phenomena of mechanical structures that can be detrimental vibrations of the structure. In this case, sensors are applied to the mechanical structure to be monitoredPiezoresistive and Piezoelectric MEMS Strain Sensors for Vibration Detection Stanley Kona, Kenn

  1. Capture of Anastrepha species (Diptera: Tephritidae) with multilure traps and biolure attractants in Guatemala

    SciTech Connect (OSTI)

    Martinez, A.J.; Salinas, E.J. [USDA-APHIS-PPQ-CPHST, 22675 N. Moorefield Rd, Edinburg, TX 78541-5033 (United States); Rendon, P. [USDA-APHIS-PPQ-CPHST, 4a Avenida 12-62, Zona 10, Guatemala City (Guatemala)

    2007-03-15

    Two trapping systems were compared in a study in Guatemala during the wet season, May through Dec 2001. Trap/lure combinations consisting of green or yellow-based plastic McPhail-like traps baited with a synthetic 2-component lure (putrescine and ammonium acetate) and 300 mL of propylene glycol antifreeze as a preservative were compared to the traditional glass McPhail baited with torula yeast/borax and 300 mL of water. Both systems captured several key Anastrepha species including Anastrepha ludens Loew, A. obliqua, Macquart, A. serpentina Weidemann, A. striata Schiner, A. distincta Greene, A. fraterculus Weidemann as well as Ceratitis capitata Weidemann. Additionally, 13 other Anastrepha spp. were captured with the synthetic lure. The plastic traps captured more key flies than the McPhail trap except for A. distincta where there were no significant differences between the yellow-based plastic trap and the McPhail trap and no significant differences between any trap and lure for trapping A. fraterculus. The synthetic lure lasted 10 weeks. The sex ratio was female-biased for almost all captured key species in both systems. Moreover, there were significant numbers of captured nontarget insects in all traps; however, the captured flies in those traps with the synthetic lure were not adversely affected by these insects. Propylene glycol-based antifreeze was a superior preservative when compared to borax/water. (author) [Spanish] En Guatemala, se compararon dos sistemas de trampeo durante la epoca lluviosa de Mayo a Deciembre, 2001. Combinaciones de trampa/atrayente que consistieron de trampas de plastico con bases verdes o amarillos y con atrayentes sinteticos (acetate de amoniaco y putrecina) fueron comparadas con el sistema de trampeo tradicional McPhail de vidrio cebada con torula y borax en agua. Los dos sistemas capturaron moscas del genero Anastrepha incluyendo Anastrepha ludens Loew, A. obliqua, Macquart, A. serpentina Weidemann, A. striata Schiner, A. distincta Greene, A. fraterculus Weidemann y Ceratitis capitata Weidemann. Ademas, se capturaron 13 especias adicionales de Anastrepha asi como Toxotrypana curvicauda Gerstaecker con el cebo sintetico. El cebo sintetico fue efectivo por diez semanas sin recebar. Las trampas de plastico capturaron mas moscas del genero Anastrepha que la trampa de cristal McPhail. Las excepciones fueron A. distincta en donde no hubo differencias el la captura con la trampa de plastico con base amarillo y la trampa McPhail de cristal asi como A. fraterculus en donde no hubo differencias comparando la captura de moscas con ambos sistemas. La proporcion sexual de las moscas capturadas con los dos sistemas fue al favor de las hembras. La captura de otros tipos de insectos fue significantemente elevado, sin embargo, las moscas capturadas con los cebos sinteticos no fueron afectados adversamente por estos insectos. El 10% del anticongelante, glicol propilico, fue superior al borax/agua como conservador de las moscas capturardas. (author)

  2. Satellites images, digitized topography, and the recognition of the Xela Caldera, Quezaltenango Valley, Guatemala

    SciTech Connect (OSTI)

    Foley, D. (Pacific Lutheran Univ., Tacoma, WA (United States). Dept. of Earth Sciences); McEwen, A.; Duffield, W. (Geological Survey, Flagstaff, AZ (United States)); Heiken, G. (Los Alamos National Lab., NM (United States))

    1992-01-01

    The authors propose, based on reconnaissance geology studies and interpretation of landforms as depicted by Landsat Thematic Mapper (TM) images combined with digitized topography, that the Quezaltenango basin of Guatemala is part of a caldera. The Quezaltenango basin is an elliptical depression, about 12 by 25 km and about 500 m deep. The proposed Xela Caldera extends beyond the basin more than 10 km to the north. The geomorphological features of the area that are typical of a geologically young large-scale caldera include bounding walls that have steep interior and gentle exterior slopes; broad flat areas at the base of the walls; at least one large block, about 3 by 12 km, that only partly floundered as the caldera collapsed; resurgence of a younger volcanic dome, flow and small-scale caldera complex (last active in 1818); younger volcanoes located along the structural margin of the major caldera (one of which is currently active) lobate features on the caldera margins that may indicate a multiple sequence of eruptions; and an active, high-temperature geothermal system. The valley is coincident with a gravity low. Extensive ash-flow tuff sheets that have no identified source are located north of the caldera, and may be the outflow deposits. The Xela caldera is similar in size to the Atitlan caldera, which lies about 50 km southeast of Quezaltenango. The Xela Caldera, if confirmed by future studies, may contain undiscovered geothermal resources, may present a significant geologic hazard to the more than 400,000 people who occupy the Quezaltenango valley, and may be a new member of the list of magmatic systems that have the capability to change global climate for several years.

  3. MEM imaging of multi-wavelength VLBA polarisation observations of Active Galactic Nuclei

    E-Print Network [OSTI]

    Coughlan, Colm P

    2013-01-01

    We have developed a C++ implementation of the Maximum Entropy Method (MEM) suitable for deconvolving VLBI polarisation data. The first results of this implementation are presented and compared with CLEAN-based deconvolutions of the same data. We present Faraday rotation measure and intrinsic polarisation maps of AGN which have been made from MEM deconvolutions of multi-wavelength observations of Stokes parameters I, Q and U. The advantages of using MEM are demonstrated, in particular its enhanced resolution over the CLEAN algorithm.

  4. Damage of MEMS thermal actuators heated by laser irradiation.

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen; Klody, Kelly Anne; Sackos, John T.; Phinney, Leslie Mary

    2005-01-01

    Optical actuation of microelectromechanical systems (MEMS) is advantageous for applications for which electrical isolation is desired. Thirty-two polycrystalline silicon opto-thermal actuators, optically-powered MEMS thermal actuators, were designed, fabricated, and tested. The design of the opto-thermal actuators consists of a target for laser illumination suspended between angled legs that expand when heated, providing the displacement and force output. While the amount of displacement observed for the opto-thermal actuators was fairly uniform for the actuators, the amount of damage resulting from the laser heating ranged from essentially no damage to significant amounts of damage on the target. The likelihood of damage depended on the target design with two of the four target designs being more susceptible to damage. Failure analysis of damaged targets revealed the extent and depth of the damage.

  5. Damage of MEMS thermal actuators heated by laser irradiation.

    SciTech Connect (OSTI)

    Walraven, Jeremy Allen; Klody, Kelly Anne; Sackos, John T.; Phinney, Leslie Mary

    2004-11-01

    Optical actuation of microelectromechanical systems (MEMS) is advantageous for applications for which electrical isolation is desired. Thirty-two polycrystalline silicon opto-thermal actuators, optically-powered MEMS thermal actuators, were designed, fabricated, and tested. The design of the opto-thermal actuators consists of a target for laser illumination suspended between angled legs that expand when heated, providing the displacement and force output. While the amount of displacement observed for the opto-thermal actuators was fairly uniform for the actuators, the amount of damage resulting from the laser heating ranged from essentially no damage to significant amounts of damage on the target. The likelihood of damage depended on the target design with two of the four target designs being more susceptible to damage. Failure analysis of damaged targets revealed the extent and depth of the damage.

  6. Piston-Driven Fluid Ejectors In Silicon Mems

    DOE Patents [OSTI]

    Galambos, Paul C. (Albuquerque, NM); Benavides, Gilbert L. (Los Ranchos, NM); Jokiel, Jr., Bernhard (Albuquerque, NM); Jakubczak II, Jerome F. (Rio Rancho, NM)

    2005-05-03

    A surface-micromachined fluid-ejection apparatus is disclosed which utilizes a piston to provide for the ejection of jets or drops of a fluid (e.g. for ink-jet printing). The piston, which is located at least partially inside a fluid reservoir, is moveable into a cylindrical fluid-ejection chamber connected to the reservoir by a microelectromechanical (MEM) actuator which is located outside the reservoir. In this way, the reservoir and fluid-ejection chamber can be maintained as electric-field-free regions thereby allowing the apparatus to be used with fluids that are electrically conductive or which may react or break down in the presence of a high electric field. The MEM actuator can comprise either an electrostatic actuator or a thermal actuator.

  7. Atomic Calligraphy: The Direct Writing of Nanoscale Structures using MEMS

    E-Print Network [OSTI]

    Matthias Imboden; Han Han; Jackson Chang; Flavio Pardo; Cristian A. Bolle; Evan Lowell; David J. Bishop

    2013-04-04

    We present a micro-electromechanical system (MEMS) based method for the resist free patterning of nano-structures. Using a focused ion beam (FIB) to customize larger MEMS machines, we fabricate apertures as small as 50 nm on plates that can be moved with nanometer precision over an area greater than 20x20 {\\mu}m^2. Depositing thermally evaporated gold atoms though the apertures while moving the plate results in the deposition of nanoscale metal patterns. Adding a shutter only microns above the aperture, enables high speed control of not only where but also when atoms are deposited. Using a shutter, different sized apertures can be selectively opened and closed for nano-structure fabrication with features ranging from nano- to micrometers in scale. The ability to evaporate materials with high precision, and thereby fabricate circuits and structures in situ, enables new kinds of experiments based on the interactions of a small number of atoms and eventually even single atoms.

  8. Recent Developments in Mems-Based Micro Fuel Cells

    E-Print Network [OSTI]

    Pichonat, T

    2007-01-01

    Micro fuel cells ($\\mu$-FC) represent promising power sources for portable applications. Today, one of the technological ways to make $\\mu$-FC is to have recourse to standard microfabrication techniques used in the fabrication of micro electromechanical systems (MEMS). This paper shows an overview on the applications of MEMS techniques on miniature FC by presenting several solutions developed throughout the world. It also describes the latest developments of a new porous silicon-based miniature fuel cell. Using a silane grafted on an inorganic porous media as the proton-exchange membrane instead of a common ionomer such as Nafion, the fuel cell achieved a maximum power density of 58 mW cm-2 at room temperature with hydrogen as fuel.

  9. Broadband Terahertz Modulators based on MEMS-Reconfigurable Mesh Filters

    E-Print Network [OSTI]

    Unlu, Mehmet; Li, Shenglin; Yang, Shang-Hua; Hashemi, Mohammad R; Jarrahi, Mona

    2013-01-01

    Despite the extensive progress in terahertz technology, existing terahertz modulators have not yet offered the modulation specifications required for high-performance terahertz imaging, spectroscopy, and communication systems. Here, we present a novel terahertz intensity modulation technique based on MEMS-reconfigurable double-layered mesh filters, which offers record-high modulation depths and modulation bandwidths, without a considerable compromise in modulation speed or modulation voltage through a fully integrated device configuration. The unique advantage of the presented modulation technique compared with the previously demonstrated terahertz modulation schemes based on tunable metamaterials is reconfiguring the device geometry, which enables radical changes in the device scattering parameters over a broad range of frequencies. Device geometry reconfiguration is made possible through integration of a double-layered mesh filter with an array of electrostatically-actuated MEMS switches. We experimentally ...

  10. An on-chip test circuit for characterization of MEMS resonators

    E-Print Network [OSTI]

    Lee, John Haeseon

    2011-01-01

    There has been much interest in developing microelectromechanical systems (MEMS) resonators that achieve comparable performance to traditional resonators yet have smaller footprint and are compatible with CMOS. Recently, ...

  11. Stress-tolerant and temperature-stable RF MEMS capacitive switches and tunable filters

    E-Print Network [OSTI]

    Reines, Isak C.

    2010-01-01

    4.2 UCSD Switch Design . . . . . . . . . . . . . . .5.2 Switch Design . . . . . . . . . . . . . . .2.2 Switch Design in the Raytheon RF MEMS Process . . . . .

  12. The Sandia MEMS Passive Shock Sensor : FY08 testing for functionality...

    Office of Scientific and Technical Information (OSTI)

    and technology readiness. Citation Details In-Document Search Title: The Sandia MEMS Passive Shock Sensor : FY08 testing for functionality, model validation, and technology...

  13. Critical issues for the application of integrated MEMS/CMOS technologies to inertial measurement units

    SciTech Connect (OSTI)

    Smith, J.H.; Ellis, J.R.; Montague, S.; Allen, J.J.

    1997-03-01

    One of the principal applications of monolithically integrated micromechanical/microelectronic systems has been accelerometers for automotive applications. As integrated MEMS/CMOS technologies such as those developed by U.C. Berkeley, Analog Devices, and Sandia National Laboratories mature, additional systems for more sensitive inertial measurements will enter the commercial marketplace. In this paper, the authors will examine key technology design rules which impact the performance and cost of inertial measurement devices manufactured in integrated MEMS/CMOS technologies. These design parameters include: (1) minimum MEMS feature size, (2) minimum CMOS feature size, (3) maximum MEMS linear dimension, (4) number of mechanical MEMS layers, (5) MEMS/CMOS spacing. In particular, the embedded approach to integration developed at Sandia will be examined in the context of these technology features. Presently, this technology offers MEMS feature sizes as small as 1 {micro}m, CMOS critical dimensions of 1.25 {micro}m, MEMS linear dimensions of 1,000 {micro}m, a single mechanical level of polysilicon, and a 100 {micro}m space between MEMS and CMOS. This is applicable to modern precision guided munitions.

  14. Performance Characteristics of a MEMS Quadrupole Mass Filter With Square Electrodes: Experimental and Simulated Results

    E-Print Network [OSTI]

    Hogan, Thomas J.

    Size reduction in quadrupole mass spectrometers (QMSs) is an ongoing requirement driven by the needs of space exploration, portable, and covert monitoring applications. Microelectromechanical systems (MEMS) technology ...

  15. Research and Development of Non-Spectroscopic MEMS-Based Sensor...

    Office of Scientific and Technical Information (OSTI)

    experiments that the combination of thermal conductivity detection (TCD) and coating-free damped resonance detection (CFDRD) using micro-electromechanical systems (MEMS)...

  16. Performance and characterization of a MEMS-based device for alignment...

    Office of Scientific and Technical Information (OSTI)

    of a MEMS-based device for alignment and manipulation of x-ray nanofocusing optics Xu, Weihe Brookhaven National Laboratory, Upton, NY, 11973 USA; Lauer, Kenneth...

  17. Theory on Measuring Orientation with MEMS Accelerometers in a Centrifuge

    E-Print Network [OSTI]

    Beemer, Ryan D.; Murali, Madhuri; Biscontin, Giovanna; Aubeny, Charles

    2015-03-21

    , in brief, examples include: evaluation of MEMS accelerometers in dynamic centrifuge testing (Stringer et al. 2010), seismic evaluation of pile reinforced slopes (Al-Defae and Knappett 2014), and measurement of pile rotation (Lau et al. 2014). However... Eq. 13 Since the across is dependent on ?n and ?n is dependent on across an iterative process is required for calculating sensor orientation. DISCUSSION Basket Orientation It is possible for the basket to rotate and not be at ? from vertical...

  18. Selective W for coating and releasing MEMS devices

    SciTech Connect (OSTI)

    Mani, S.S.; Fleming, J.G.; Sniegowski, J.J.; Boer, M.P. de; Irwin, L.W.; Walraven, J.A.; Tanner, D.M.; Lavan, D.A.

    2000-01-04

    Two major problems associated with Si-based MEMS (MicroElectroMechanical Systems) devices are stiction and wear. Surface modifications are needed to reduce both adhesion and friction in micromechanical structures to solve these problems. In this paper, the authors will present a CVD (Chemical Vapor Deposition) process that selectively coats MEMS devices with tungsten and significantly enhances device durability. Tungsten CVD is used in the integrated-circuit industry, which makes this approach manufacturable. This selective deposition process results in a very conformal coating and can potentially address both stiction and wear problems confronting MEMS processing. The selective deposition of tungsten is accomplished through the silicon reduction of WF{sub 6}. The self-limiting nature of this selective W deposition process ensures the consistency necessary for process control. The tungsten is deposited after the removal of the sacrificial oxides to minimize stress and process integration problems. Tungsten coating adheres well and is hard and conducting, requirements for device performance. Furthermore, since the deposited tungsten infiltrates under adhered silicon parts and the volume of W deposited is less than the amount of Si consumed, it appears to be possible to release stuck parts that are contacted over small areas such as dimples. The wear resistance of selectively coated W parts has been shown to be significantly improved on microengine test structures.

  19. Friction of different monolayer lubricants in MEMs interfaces.

    SciTech Connect (OSTI)

    Carpick, Robert W. (University of Wisconsin, Madison, WI); Street, Mark D.; Ashurst, William Robert; Corwin, Alex David

    2006-01-01

    This report details results from our last year of work (FY2005) on friction in MEMS as funded by the Campaign 6 program for the Microscale Friction project. We have applied different monolayers to a sensitive MEMS friction tester called the nanotractor. The nanotractor is also a useful actuator that can travel {+-}100 {micro}m in 40 nm steps, and is being considered for several MEMS applications. With this tester, we can find static and dynamic coefficients of friction. We can also quantify deviations from Amontons' and Coulomb's friction laws. Because of the huge surface-to-volume ratio at the microscale, surface properties such as adhesion and friction can dominate device performance, and therefore such deviations are important to quantify and understand. We find that static and dynamic friction depend on the monolayer lubricant applied. The friction data can be modeled with a non-zero adhesion force, which represents a deviation from Amontons' Law. Further, we show preliminary data indicating that the adhesion force depends not only on the monolayer, but also on the normal load applied. Finally, we also observe slip deflections before the transition from static to dynamic friction, and find that they depend on the monolayer.

  20. MEMS-based thin-film fuel cells

    DOE Patents [OSTI]

    Jankowksi, Alan F.; Morse, Jeffrey D.

    2003-10-28

    A micro-electro-mechanical systems (MEMS) based thin-film fuel cells for electrical power applications. The MEMS-based fuel cell may be of a solid oxide type (SOFC), a solid polymer type (SPFC), or a proton exchange membrane type (PEMFC), and each fuel cell basically consists of an anode and a cathode separated by an electrolyte layer. Additionally catalyst layers can also separate the electrodes (cathode and anode) from the electrolyte. Gas manifolds are utilized to transport the fuel and oxidant to each cell and provide a path for exhaust gases. The electrical current generated from each cell is drawn away with an interconnect and support structure integrated with the gas manifold. The fuel cells utilize integrated resistive heaters for efficient heating of the materials. By combining MEMS technology with thin-film deposition technology, thin-film fuel cells having microflow channels and full-integrated circuitry can be produced that will lower the operating temperature an will yield an order of magnitude greater power density than the currently known fuel cells.

  1. Catalog of historic seismicity in the vicinity of the Chixoy-Polochic and Motagua faults, Guatemala. Final report

    SciTech Connect (OSTI)

    White, R.A.

    1984-01-01

    A new catalog of shallow historical earthquakes for the region of the Caribbean-North American plate boundary in Guatemala is presented. The catalog is drawn mostly from original official documents that are considered to be primary accounts. It contains 25 damaging earthquakes, 18 of which have not previously been published. The catalog is estimated to be complete for magnitude 6.5 earthquakes since 1700 for most of the study area. The earthquakes in this catalog can be grouped into periods of seismic activity alternating with extended periods of seismic quiescence. The periods of seismic activity appear to be terminated by the major rupture of either the Chixoy-Polochic or Motagua faults, the two principal sub-parallel faults that form the transform plate boundary in Guatemala. Although the plate boundary is not simple in this region, the alternating nature of the regional seismic activity with seismic quiescence is a classic example of the seismic cycle concept. It is estimated that a very large earthquake (M 7.5) may recur along a transform boundary fault between 160 to 300 years after the previous such earthquake in the region. 20 refs., 5 figs.

  2. Dating the Vinland Map

    ScienceCinema (OSTI)

    None

    2013-07-17

    Scientists from Brookhaven National Laboratory, the University of Arizona, and the Smithsonian Institution used carbon-dating technology to determine the age of a controversial parchment that might be the first-ever map of North America.

  3. Publish date: 06/27/2011 ECE 4385: Introduction to Microsystems I

    E-Print Network [OSTI]

    Gelfond, Michael

    System Design, J. Allen Catalog description: Fundamentals of microelectromechancial (MEMS an interdisciplinary overview of the current state of MEMS 2. Use numerical tools to predict the behavior of MEMS 3. Operate and analyze the behavior of MEMS 4. Utilize computer layout and simulation tools to design MEMS

  4. MEMS-based contact stress field measurements at a rough elastomeric layer: local test of Amontons' friction law in static

    E-Print Network [OSTI]

    Adda-Bedia, Mokhtar

    MEMS-based contact stress field measurements at a rough elastomeric layer: local test of Amontons/Universit´e Paris 6, Paris, France Abstract. We present the results of recent friction experiments in which a MEMS

  5. Performance-Driven Microfabrication-Oriented Methodology for MEMS Conceptual Design with Application in Microfluidic Device Design

    E-Print Network [OSTI]

    Deng, Y.-M.

    Performance and manufacturability are two important issues that must be taken into account during MEMS design. Existing MEMS design models or systems follow a process-driven design paradigm, that is, design starts from the ...

  6. Integration of TCAD Tools into CAD Tools for MEMS Nathan M. Wilson 1 , Robert W. Dutton 2

    E-Print Network [OSTI]

    Dutton, Robert W.

    @stanford.edu Micro-Electro-Mechanical Systems (MEMS) o#11;er dramatic new functional capabilities. Analysis of MEMSIntegration of TCAD Tools into CAD Tools for MEMS Nathan M. Wilson 1 , Robert W. Dutton 2- dimensional. The multi-domain physics for MEMS includes electrical, mechanical, and uidic interactions. E#11

  7. GNSS -05, December 8-10, 2005, Hong Kong 1 Development of a DGPS/MEMS IMU Integrated System for

    E-Print Network [OSTI]

    Calgary, University of

    navigation solution. Advances in MEMS inertial sensor technology constitute an increasingly attractive lowGNSS -05, December 8-10, 2005, Hong Kong 1 Development of a DGPS/MEMS IMU Integrated System Drive N.W., Calgary, Alberta, CANADA, T2N 1N4 Abstract. The aim of this paper is to develop a DGPS/MEMS

  8. Sensors and Actuators A 132 (2006) 139146 MEMS based digital variable capacitors with a high-k dielectric insulator

    E-Print Network [OSTI]

    Fleck, Norman A.

    2006-01-01

    Sensors and Actuators A 132 (2006) 139­146 MEMS based digital variable capacitors with a high Abstract A novel MEMS based digital variable capacitor was designed and fabricated. The device consists and keep the cantilever stuck on the substrate. © 2006 Elsevier B.V. All rights reserved. Keywords: MEMS

  9. 390 IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 41, NO. 3, MARCH 2005 MEMS-Tunable Vertical-Cavity SOAs

    E-Print Network [OSTI]

    MacDonald, Noel C.

    390 IEEE JOURNAL OF QUANTUM ELECTRONICS, VOL. 41, NO. 3, MARCH 2005 MEMS-Tunable Vertical properties, and noise figure (NF) of MEMS-based widely tunable vertical-cavity semiconductor optical electrostatic actuator are outlined. It is found that MEMS-tunable VCSOAs follow many of the same design trends

  10. 608 IEEE TRANSACTIONS ON ADVANCED PACKAGING, VOL. 23, NO. 4, NOVEMBER 2000 MEMS Post-Packaging by Localized Heating and

    E-Print Network [OSTI]

    Lin, Liwei

    608 IEEE TRANSACTIONS ON ADVANCED PACKAGING, VOL. 23, NO. 4, NOVEMBER 2000 MEMS Post of microelectromechanical systems (MEMS). Establishing a versatile post-packaging process not only advances the field technologies of MEMS packaging and wafer bonding is followed by an innovative post-packaging approach

  11. An Overview on MEMS-based Storage, Its Research Issues and Open Problems Department of Computer Science and Engineering

    E-Print Network [OSTI]

    Zhu, Yifeng

    An Overview on MEMS-based Storage, Its Research Issues and Open Problems Yifeng Zhu Department technology based on Microelectromechanical Systems (MEMS) is emerging as an exciting complement to the memory potential research issues in MEMS storage are identified, including (1) exploiting idle read/write tips

  12. Engineering Analysis with Boundary Elements 30 (2006) 940948 Dual BIE approaches for modeling electrostatic MEMS problems with

    E-Print Network [OSTI]

    Liu, Yijun

    2006-01-01

    electrostatic MEMS problems with thin beams and accelerated by the fast multipole method Y.J. Liuà Department of electrostatic fields exterior to thin-beam structures as found in some micro-electro-mechanical systems (MEMS that the dual BIEs are very effective in solving MEMS problems with thin beams and the fast multipole BEM

  13. IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 1, JANUARY 2000 7 Low-Loss Distributed MEMS Phase Shifter

    E-Print Network [OSTI]

    York, Robert A.

    IEEE MICROWAVE AND GUIDED WAVE LETTERS, VOL. 10, NO. 1, JANUARY 2000 7 Low-Loss Distributed MEMS a one-bit low-loss -band phase shifter circuit that employs microelectromechanical systems (MEMS, demonstrates the potential for the implementation of a very low-loss multibit digital MEMS phase shifter. Index

  14. 15th Biennial University/Government/Industry Microelectronics Symposium, Boise, Idaho, June 30 -July 2, 2003. Hands-On MEMS

    E-Print Network [OSTI]

    Frechette, Luc G.

    - July 2, 2003. Hands-On MEMS Luc Frechette1 , Vijay Modi1 , Floyd Miller2 and K. R. Farmer3 1Dept, NJ 07102 Abstract-- We have developed an innovative MEMS education program that combines virtual fabrication with actual testing of classic MEMS devices. This approach is suitable both for large classes

  15. A High Aspect Ratio Parylene Micro-Stencil for Large Scale Micro-Patterning for MEMS Applications

    E-Print Network [OSTI]

    Dokmeci, Mehmet

    A High Aspect Ratio Parylene Micro-Stencil for Large Scale Micro- Patterning for MEMS Applications and selective metal deposition onto fragile MEMS devices. This paper will discuss the details of the parylene substrates (lacking chemical and thermal stability) and on released MEMS (fragile) devices. Hence, Shadow

  16. Abstract --We describe a MEMS-on-CMOS microsystem to encage, culture, and monitor cells. The system was designed

    E-Print Network [OSTI]

    Maryland at College Park, University of

    Abstract -- We describe a MEMS-on-CMOS microsystem to encage, culture, and monitor cells. A MEMS process flow was developed for the fabrication of closeable micro-vials to contain each cell, a custom bio-amplifier CMOS chip was designed, fabricated, and tested, and the fabrication of the MEMS

  17. Low Actuation Voltage RF MEMS SwitchesWith Signal Frequencies From 0.25GHz to 40GHz

    E-Print Network [OSTI]

    Shen, Shyh-Chiang

    Low Actuation Voltage RF MEMS SwitchesWith Signal Frequencies From 0.25GHz to 40GHz Shyh-voltage radio-frequency micro- electromechanical system (RF MEMS) switch is reported. The device switching of better than 27 dB over the frequency band from 0.25GHz to 40GHz was achieved. The RF MEMS switch

  18. Low-voltage small-size double-arm MEMS N. Biyikli, Y. Damgaci and B.A. Cetiner

    E-Print Network [OSTI]

    Cetiner, Bedri A.

    Low-voltage small-size double-arm MEMS actuator N. Biyikli, Y. Damgaci and B.A. Cetiner The fabrication and characterisation of a double-arm cantilever-type metallic DC-contact MEMS actuator with low MEMS actuator, this actuator showed actuation vol- tages lower than 10 V. RF measurements of the 10 mm

  19. JOURNAL OF MICROELECTROMECHANICAL SYSTEMS, VOL. 17, NO. 1, FEBRUARY 2008 85 Vertically-Shaped Tunable MEMS Resonators

    E-Print Network [OSTI]

    Rubloff, Gary W.

    -Shaped Tunable MEMS Resonators Brian Morgan, Member, IEEE, and Reza Ghodssi, Member, IEEE Abstract--We report], and vibration-to- electric energy conversion [6]­[8]. Multiple MEMS approaches have been investigated for tuning, Adelphi, MD 20783 USA (e-mail: brian.morgan6@arl.army.mil). R. Ghodssi is with the MEMS Sensors

  20. Reconfigurable Multi-Beam Spiral Antenna with RF-MEMS Capacitive Series Switches Fabricated on Rigid Substrates

    E-Print Network [OSTI]

    De Flaviis, Franco

    Reconfigurable Multi-Beam Spiral Antenna with RF-MEMS Capacitive Series Switches Fabricated antenna, which radiates multi-beam with radio frequency-micro electro mechanical system (RF-MEMS.8). The spiral is configured by three-arms, which can be interconnected by two RF-MEMS series switches

  1. IEEE PHOTONICS TECHNOLOGY LETTERS, VOL. 17, NO. 10, OCTOBER 2005 2029 Linewidth Measurements of MEMS-Based Tunable

    E-Print Network [OSTI]

    Kahn, Joseph M.

    and the frequency noise spectrum method--to measure linewidths of microelectromechanical systems (MEMS)-based tun) based on microelectromechanical systems (MEMS). We find that the two methods yield similar results of MEMS-Based Tunable Lasers for Phase-Locking Applications Ezra Ip, Joseph M. Kahn, Fellow, IEEE, Doug

  2. A LOW COST WAFER-LEVEL MEMS PACKAGING TECHNOLOGY Pejman Monajemi, Paul J. Joseph*

    E-Print Network [OSTI]

    Ayazi, Farrokh

    A LOW COST WAFER-LEVEL MEMS PACKAGING TECHNOLOGY Pejman Monajemi, Paul J. Joseph* , Paul A. Kohl-cost low-temperature packaging technique for wafer-level encapsulation of MEMS devices fabricated on any arbitrary substrate. The packaging process presented here does not involve wafer bonding and can be applied

  3. A Novel Pump for MEMS Applications Mihir Sen, Daniel Wajerski, and Mohamed Gad-el-Hak

    E-Print Network [OSTI]

    Gad-el-Hak, Mohamed

    1 A Novel Pump for MEMS Applications Mihir Sen, Daniel Wajerski, and Mohamed Gad-el-Hak Department of Fluids Engineering, vol. 118, pp. 624-627, 1996. #12;2 A Novel Pump for MEMS Applications Mihir Sen1 of Notre Dame Notre Dame, IN 46556 We present a novel approach for pumping fluids in micromechanical

  4. A System for Electro-Mechanical Reliability Testing of MEMS Devices Stefan Spinner

    E-Print Network [OSTI]

    Polian, Ilia

    A System for Electro-Mechanical Reliability Testing of MEMS Devices Stefan Spinner Computer and a method that enables automated analysis of mechanical stress impact on microelectromechanical systems (MEMS). In this setup both electrical and optical inspection are available. Reliability testing

  5. Bio-implantable passive on-chip RF-MEMS strain sensing resonators for orthopaedic applications

    E-Print Network [OSTI]

    Demir, Hilmi Volkan

    Bio-implantable passive on-chip RF-MEMS strain sensing resonators for orthopaedic applications. Micromech. Microeng. 18 (2008) 115017 (9pp) doi:10.1088/0960-1317/18/11/115017 Bio-implantable passive on designed novel, bio-implantable, passive, on-chip, RF-MEMS strain sensors that rely on the resonance

  6. APPLICATION OF MEMS TECHNOLOGY TO MICRO DIRECT METHANOL FUEL CELL Xiaowei Liu*

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    APPLICATION OF MEMS TECHNOLOGY TO MICRO DIRECT METHANOL FUEL CELL Xiaowei Liu* , Chunguang Suo, email: lxw@hit.edu.cn) ABSTRACT In view of micro fuel cells, the silicon processes are employed for microfabrication of the micro direct methanol fuel cell (DMFC). Using the MEMS technology we have successfully made

  7. Design of Compliant Meanders for Applications in MEMS, Actuators, and Flexible Electronics

    E-Print Network [OSTI]

    Shapiro, Benjamin

    1 Design of Compliant Meanders for Applications in MEMS, Actuators, and Flexible Electronics Bavani-electro-mechanical systems (MEMS) to stretchable electrodes in flexible electronics and dielectric elastomer actuators are required in flexible displays [4], stretchable circuits [5], flexible antennas [6], and dielectric

  8. Electrostatic Operation and Curvature Modeling for a MEMS Flexible Film Actuator

    E-Print Network [OSTI]

    Electrostatic Operation and Curvature Modeling for a MEMS Flexible Film Actuator B. Edmonds, Jr.1 Introduction and Motivation The electrostatic flexible film actuator, also known as an "Artificial Eyelid," is a unique MEMS (MicroElectronic Mechanical System) actuator fabricated from polyimide and thin metal films

  9. EXPERIMENTAL INVESTIGATION OF ORGANIC MEMS BASED CONDUCTIVE POLYMER-METAL COMPOSITE

    E-Print Network [OSTI]

    Kassegne, Samuel Kinde

    by focusing on composite mixing methods and solid fabrication parameters for organic solar cell fabricationEXPERIMENTAL INVESTIGATION OF ORGANIC MEMS BASED CONDUCTIVE POLYMER-METAL COMPOSITE. Sam Kassegne #12;vi ABSTRACT OF THE THESIS Experimental Investigation of Organic MEMS based conductive

  10. 2780 IEEE SENSORS JOURNAL, VOL. 11, NO. 11, NOVEMBER 2011 Folded MEMS Pyramid Inertial Measurement Unit

    E-Print Network [OSTI]

    Chen, Zhongping

    2780 IEEE SENSORS JOURNAL, VOL. 11, NO. 11, NOVEMBER 2011 Folded MEMS Pyramid Inertial Measurement. A prototype of the folded MEMS pyramid IMU with co-fabricated iner- tial sensors, electrical interconnects-on-insulator (SOI) backbone with in-situ fabricated high-aspect-ratio sensors. A planar multi- sensor unit

  11. Beam control in multiphoton microscopy using a MEMS spatial light Thomas Bifano*, Hari Paudel

    E-Print Network [OSTI]

    Bifano, Thomas

    . The combination of MPM and a fast microelectromechanical spatial light modulator (MEMS SLM) offers a compellingBeam control in multiphoton microscopy using a MEMS spatial light modulator Thomas Bifano*, Hari instrument. S-MPM's imaging advantages are enabled by a high-speed, microelectromechanical spatial light

  12. 4096-element continuous face-sheet MEMS deformable mirror for high-contrast imaging

    E-Print Network [OSTI]

    Bifano, Thomas

    microelectromechanical systems MEMS DM that has been demonstrated to be capable of flattening a wavefront 0.54 nm rms4096-element continuous face-sheet MEMS deformable mirror for high-contrast imaging Steven A 02138 Abstract. We present the progress in the development of a 4096- element microelectromechanical

  13. A Membrane Deflection Fracture Experiment to Investigate Fracture Toughness of Freestanding MEMS Materials

    E-Print Network [OSTI]

    Espinosa, Horacio D.

    A Membrane Deflection Fracture Experiment to Investigate Fracture Toughness of Freestanding MEMS Materials H.D. Espinosa* and B. Peng ABSTRACT This paper presents a novel Membrane Deflection Fracture Experiment (MDFE) to investigate the fracture toughness of MEMS and other advanced materials in thin film

  14. Validation of thermal models for a prototypical MEMS thermal actuator.

    SciTech Connect (OSTI)

    Gallis, Michail A.; Torczynski, John Robert; Piekos, Edward Stanley; Serrano, Justin Raymond; Gorby, Allen D.; Phinney, Leslie Mary

    2008-09-01

    This report documents technical work performed to complete the ASC Level 2 Milestone 2841: validation of thermal models for a prototypical MEMS thermal actuator. This effort requires completion of the following task: the comparison between calculated and measured temperature profiles of a heated stationary microbeam in air. Such heated microbeams are prototypical structures in virtually all electrically driven microscale thermal actuators. This task is divided into four major subtasks. (1) Perform validation experiments on prototypical heated stationary microbeams in which material properties such as thermal conductivity and electrical resistivity are measured if not known and temperature profiles along the beams are measured as a function of electrical power and gas pressure. (2) Develop a noncontinuum gas-phase heat-transfer model for typical MEMS situations including effects such as temperature discontinuities at gas-solid interfaces across which heat is flowing, and incorporate this model into the ASC FEM heat-conduction code Calore to enable it to simulate these effects with good accuracy. (3) Develop a noncontinuum solid-phase heat transfer model for typical MEMS situations including an effective thermal conductivity that depends on device geometry and grain size, and incorporate this model into the FEM heat-conduction code Calore to enable it to simulate these effects with good accuracy. (4) Perform combined gas-solid heat-transfer simulations using Calore with these models for the experimentally investigated devices, and compare simulation and experimental temperature profiles to assess model accuracy. These subtasks have been completed successfully, thereby completing the milestone task. Model and experimental temperature profiles are found to be in reasonable agreement for all cases examined. Modest systematic differences appear to be related to uncertainties in the geometric dimensions of the test structures and in the thermal conductivity of the polycrystalline silicon test structures, as well as uncontrolled nonuniform changes in this quantity over time and during operation.

  15. Sources of stress gradients in electrodeposited Ni MEMS.

    SciTech Connect (OSTI)

    Hearne, Sean Joseph; Floro, Jerrold Anthony; Dyck, Christopher William

    2004-06-01

    The ability of future integrated metal-semiconductor micro-systems such as RF MEMS to perform highly complex functions will depend on developing freestanding metal structures that offer improved conductivity and reflectivity over polysilicon structures. For example, metal-based RF MEMS technology could replace the bulky RF system presently used in communications, navigation, and avionics systems. However, stress gradients that induce warpage of active components have prevented the implementation of this technology. Figure 1, is an interference micrograph image of a series of cantilever beams fabricated from electrodeposited Ni. The curvature in the beams was the result of stress gradients intrinsic to the electrodeposition process. To study the sources of the stress in electrodeposition of Ni we have incorporated a wafer curvature based stress sensor, the multibeam optical stress sensor, into an electrodeposition cell. We have determined that there are two regions of stress induced by electrodepositing Ni from a sulfamate-based bath (Fig 2). The stress evolution during the first region, 0-1000{angstrom}, was determined to be dependent only on the substrate material (Au vs. Cu), whereas the stress evolution during the second region, >1000{angstrom}, was highly dependent on the deposition conditions. In this region, the stress varied from +0.5 GPa to -0.5GPa, depending solely on the deposition rate. We examined four likely sources for the compressive intrinsic stress, i.e. reduction in tensile stress, and determined that only the adatom diffusion into grain boundaries model of Sheldon, et al. could account for the observed compressive stress. In the presentation, we shall discuss the compressive stress generation mechanisms considered and the ramifications of these results on fabrication of electrodeposited Ni for MEMS applications.

  16. PHYS 4xx Mem 6 1 2010 by David Boal, Simon Fraser University. All rights reserved; further copying or resale is strictly prohibited.

    E-Print Network [OSTI]

    Boal, David

    PHYS 4xx Mem 6 1 2010 by David Boal, Simon Fraser University. All rights reserved; further copying or resale is strictly prohibited. 4xx Mem 6 - Van der Waals and electrostatic interactions Lecture Mem 5 A B #12;PHYS 4xx Mem 6 2 2010 by David Boal, Simon Fraser University. All rights reserved; further

  17. IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS--I: FUNDAMENTAL THEORY AND APPLICATIONS, VOL. 48, NO. 2, FEBRUARY 2001 133 Synchronization of MEMS Resonators and

    E-Print Network [OSTI]

    Izhikevich, Eugene

    , FEBRUARY 2001 133 Synchronization of MEMS Resonators and Mechanical Neurocomputing Frank C. Hoppensteadt: microelectromechanical systems (MEMS) and neu- rocomputing. First, we consider MEMS oscillators having low amplitude. Then, we investigate a theoretical possibility of using MEMS oscillators to build an oscillatory

  18. Aluminum Nitride Thin Films on Titanium for Piezoelectric MEMS Applications Seth Boeshore, Emily Parker, Vanni Lughi, Noel C. MacDonald

    E-Print Network [OSTI]

    MacDonald, Noel C.

    Aluminum Nitride Thin Films on Titanium for Piezoelectric MEMS Applications Seth Boeshore, Emily piezoelectric MEMS. Titanium is a new and attractive platform for MEMS because of its corrosion resistance with standard silicon MEMS processing and has found widespread use in film bulk acoustic resonators (FBARs

  19. Charging characteritiscs of ultrananocrystalline diamond in RF MEMS capacitive switches.

    SciTech Connect (OSTI)

    Sumant, A. V.; Goldsmith, C.; Auciello, O.; Carlisle, J.; Zheng, H.; Hwang, J. C. M.; Palego, C.; Wang, W.; Carpick, R.; Adiga, V.; Datta, A.; Gudeman, C.; O'Brien, S.; Sampath, S.

    2010-05-01

    Modifications to a standard capacitive MEMS switch process have been made to allow the incorporation of ultra-nano-crystalline diamond as the switch dielectric. The impact on electromechanical performance is minimal. However, these devices exhibit uniquely different charging characteristics, with charging and discharging time constants 5-6 orders of magnitude quicker than conventional materials. This operation opens the possibility of devices which have no adverse effects of dielectric charging and can be operated near-continuously in the actuated state without significant degradation in reliability.

  20. Micro Electro-Mechanical System (MEMS) Pressure Sensor for Footwear

    DOE Patents [OSTI]

    Kholwadwala, Deepesh K. (Albuquerque, NM); Rohrer, Brandon R. (Albuquerque, NM); Spletzer, Barry L. (Albuquerque, NM); Galambos, Paul C. (Albuquerque, NM); Wheeler, Jason W. (Albuquerque, NM); Hobart, Clinton G. (Albuquerque, NM); Givler, Richard C. (Albuquerque, NM)

    2008-09-23

    Footwear comprises a sole and a plurality of sealed cavities contained within the sole. The sealed cavities can be incorporated as deformable containers within an elastic medium, comprising the sole. A plurality of micro electro-mechanical system (MEMS) pressure sensors are respectively contained within the sealed cavity plurality, and can be adapted to measure static and dynamic pressure within each of the sealed cavities. The pressure measurements can provide information relating to the contact pressure distribution between the sole of the footwear and the wearer's environment.

  1. A novel method of fabricating integrated FETs for MEMS applications.

    SciTech Connect (OSTI)

    Okandan, Murat; Bennett, Reid Stuart; Draper, Bruce Leroy; Mani, Seethambal S.

    2003-07-01

    This paper demonstrates a simple technique for building n-channel MOSFETs and complex micromechanical systems simultaneously instead of serially, allowing a more straightforward integration of complete systems. The fabrication sequence uses few additional process steps and only one additional masking layer compared to a MEMS-only technology. The process flow forms the MOSFET gate electrode using the first level of mechanical polycrystalline silicon, while the MOSFET source and drain regions are formed by dopant diffusions into the substrate from subsequent levels of heavily doped poly that is used for mechanical elements. The process yields devices with good, repeatable electrical characteristics suitable for a wide range of digital and analog applications.

  2. EMERGENCY MANAGEMENT Effective Date

    E-Print Network [OSTI]

    Fernandez, Eduardo

    SUBJECT: EMERGENCY MANAGEMENT Effective Date: 4-7-14 Policy Number: 1.14 Supersedes: Policy 4 assets and ensure continued operations during and after all manner of emergencies, whether natural or man- made, by implementing appropriate emergency management policies, plans, and procedures designed

  3. MEMS design rule checking: a batch approach for remote operation

    SciTech Connect (OSTI)

    Yarberry, V.R.

    1998-01-01

    This paper describes a design rule checking (DRC) tool developed as an aid for designing microelectromechanical structures (MEMS) using AutoCAD running on a Windows NT workstation. The application suite, MEMSdrc, consists of: a graphical user interface integrated into AutoCAD to invoke DRC, translation and interface software to communicate with a commercial IC layout design checking software package, and routines to interactively display and review the results. The user interface provides the capability to select a checking window area and specific DRC rules to be applied to the design. The MEMS structures, defined as 2D AutoCAD geometry are translated first into DXF format, then to GDSII format. A remote process transfers the files to a Unix workstation where Mentor Graphics ICverify is invoked to perform the layout design rule checks. Upon completion, the results are translated into DXF geometry and returned back to the Windows NT workstation to be overlaid onto the original design. A set of icons are provided for the user to interactively review the results inside of AutoCAD using a first/next/previous technique.

  4. Design tools and issues of silicon micromachined (MEMS) devices

    SciTech Connect (OSTI)

    Davies, B.R.; Rodgers, M.S.; Montague, S.

    1998-05-01

    This paper describes the design and design issues associated with silicon surface micromachined device design Some of the tools described are adaptations of macro analysis tools. Design issues in the microdomain differ greatly from design issues encountered in the macrodomain. Microdomain forces caused by electrostatic attraction, surface tension, Van der Walls forces, and others can be more significant than inertia, friction, or gravity. Design and analysis tools developed for macrodomain devices are inadequate in most cases for microdomain devices. Microdomain specific design and analysis tools are being developed, but are still immature and lack adequate functionality. The fundamental design process for surface micromachined devices is significantly different than the design process employed in the design of macro-sized devices. In this paper, MEMS design will be discussed as well as the tools used to develop the designs and the issues relating fabrication processes to design. Design and analysis of MEMS devices is directly coupled to the silicon micromachining processes used to fabricate the devices. These processes introduce significant design limitations and must be well understood before designs can be successfully developed. In addition, some silicon micromachining fabrication processes facilitate the integration of silicon micromachines with microelectronics on-chip. For devices requiring on-chip electronics, the fabrication processes introduce additional design constraints that must be taken into account during design and analysis.

  5. Progress toward a MEMS fabricated 100 GHz oscillator.

    SciTech Connect (OSTI)

    Loubriel, Guillermo Manuel; Lemp, Thomas; Weyn, Mark L.; Coleman, Phillip Dale; Rowley, James E. (SAIC, Albuquerque, NM)

    2006-02-01

    This report summarizes an LDRD effort which looked at the feasibility of building a MEMS (Micro-Electro-Mechanical Systems) fabricated 100 GHz micro vacuum tube. PIC Simulations proved to be a very useful tool in investigating various device designs. Scaling parameters were identified. This in turn allowed predictions of oscillator growth based on beam parameters, cavity geometry, and cavity loading. The electron beam source was identified as a critical element of the design. FEA's (Field Emission Arrays) were purchased to be built into the micro device. Laboratory testing of the FEA's was also performed which pointed out care and handling issues along with maximum current capabilities. Progress was made toward MEMS fabrication of the device. Techniques were developed and successfully employed to build up several of the subassemblies of the device. However, the lower wall fabrication proved to be difficult and a successful build was not completed. Alternative approaches to building this structure have been identified. Although these alternatives look like good solutions for building the device, it was not possible to complete a redesign and build during the timeframe of this effort.

  6. Frequency-dependent electrostatic actuation in microfluidic MEMS.

    SciTech Connect (OSTI)

    Zavadil, Kevin Robert; Michalske, Terry A.; Sounart, Thomas L.

    2003-09-01

    Electrostatic actuators exhibit fast response times and are easily integrated into microsystems because they can be fabricated with standard IC micromachining processes and materials. Although electrostatic actuators have been used extensively in 'dry' MEMS, they have received less attention in microfluidic systems probably because of challenges such as electrolysis, anodization, and electrode polarization. Here we demonstrate that ac drive signals can be used to prevent electrode polarization, and thus enable electrostatic actuation in many liquids, at potentials low enough to avoid electrochemistry. We measure the frequency response of an interdigitated silicon comb-drive actuator in liquids spanning a decade of dielectric permittivities and four decades of conductivity, and present a simple theory that predicts the characteristic actuation frequency. The analysis demonstrates the importance of the native oxide on silicon actuator response, and suggests that the actuation frequency can be shifted by controlling the thickness of the oxide. For native silicon devices, actuation is predicted at frequencies less than 10 MHz, in electrolytes of ionic strength up to 100 mmol/L, and thus electrostatic actuation may be feasible in many bioMEMS and other microfluidic applications.

  7. The use of a high-order MEMS deformable mirror in the Gemini Planet Imager

    SciTech Connect (OSTI)

    Poyneer, L A; Bauman, B; Cornelissen, S; Jones, S; Macintosh, B; Palmer, D; Isaacs, J

    2010-12-17

    We briefly review the development history of the Gemini Planet Imager's 4K Boston Micromachines MEMS deformable mirror. We discuss essential calibration steps and algorithms to control the MEMS with nanometer precision, including voltage-phase calibration and influence function characterization. We discuss the integration of the MEMS into GPI's Adaptive Optics system at Lawrence Livermore and present experimental results of 1.5 kHz closed-loop control. We detail mitigation strategies in the coronagraph to reduce the impact of abnormal actuators on final image contrast.

  8. Media contact: Release date

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELING Release date: Todd A. NelsonJune 3,4,

  9. Media contact: Release date

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELING Release date: Todd A. NelsonJune

  10. Media contact: Release date

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELING Release date: Todd A. NelsonJuneJune

  11. Media contact: Release date

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELING Release date: Todd A.

  12. Media contact: Release date

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELING Release date: Todd A.February 10,

  13. Monotonic and fatigue testing of spring-bridged freestanding microbeams application for MEMS

    E-Print Network [OSTI]

    Lin, Ming-Tzer; Tong, Chi-Jia

    2008-01-01

    Microelectromechanical systems (MEMS) technologies are developing rapidly with increasing study of the design, fabrication and commercialization of microscale systems and devices. Accurate knowledge on the mechanical behaviors of thin film materials used for MEMS is important for successful design and development of MEMS. Here a novel electroplating spring-bridge micro-tensile specimen integrates pin-pin align holes, misalignment compensate spring, load sensor beam and freestanding thin film is demonstrated and fabricated. The specimen is fit into a specially designed micro-mechanical apparatus to carry out a series of monotonic tensile testing on sub-micron freestanding thin films. Certain thin films applicable as structure or motion gears in MEMS were tested including sputtered gold, copper and tantalum nitride thin films. Metal specimens were fabricated by sputtering; for tantalum nitride film samples, nitrogen gas was introduced into the chamber during sputtering tantalum films on the silicon wafer. The s...

  14. Emergency delivery of Vasopressin from an implantable MEMS rapid drug delivery device

    E-Print Network [OSTI]

    Ho Duc, Hong Linh, 1978-

    2009-01-01

    An implantable rapid drug delivery device based on micro-electro-mechanical systems (MEMS) technology was designed, fabricated and validated for the in vivo rapid delivery of vasopressin in a rabbit model. In vitro ...

  15. Payload characterization for CubeSat demonstration of MEMS deformable mirrors

    E-Print Network [OSTI]

    Cahoy, Kerri

    Coronagraphic space telescopes require wavefront control systems for high-contrast imaging applications such as exoplanet direct imaging. High-actuator-count MEMS deformable mirrors (DM) are a key element of these wavefront ...

  16. A MEMS-based, high-resolution Electric-Field meter

    E-Print Network [OSTI]

    Shafran, John Sawa

    2005-01-01

    In MEMS-based inertial sensors, such as accelerometers and gyroscopes, known electrical waveforms are applied to a modulating capacitive element to determine an unknown deflection. However, the inverse of this scheme can ...

  17. An Implantable MEMS Drug Delivery Device for Rapid Delivery in Ambulatory Emergency Care

    E-Print Network [OSTI]

    Elman, Noel

    We introduce the first implantable drug delivery system based on MEMS (Micro-Electro-Mechanical-Systems) technology specifically designed as a platform for treatment in ambulatory emergency care. The device is named ...

  18. Assembling 3D MEMS structures by folding, aligning and latching 2D patterned films

    E-Print Network [OSTI]

    Shaar, Nader S. (Nader Salah)

    2014-01-01

    The techniques used in the fabrication of micro-electro-mechanical systems (MEMS) were adopted from the integrated circuits (IC) industry and are mostly limited to patterning thin films on a flat substrate. As a consequence, ...

  19. The use of a high-order MEMS deformable mirror in the Gemini...

    Office of Scientific and Technical Information (OSTI)

    function characterization. We discuss the integration of the MEMS into GPI's Adaptive Optics system at Lawrence Livermore and present experimental results of 1.5 kHz closed-loop...

  20. Self-powered wireless sensor system using MEMS piezoelectric micro power generator (PMPG)

    E-Print Network [OSTI]

    Xia, YuXin, M.B.A. Sloan School of Management.

    2006-01-01

    A thin-film lead zirconate titanate, Pb(Zr,Ti)03, MEMS Piezoelectric Micro Power Generator (PMPG) has been integrated with a commercial wireless sensor node (Telos), to demonstrate a self-powered RF temperature sensor ...