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Sample records for hexoloy sa silicon

  1. High temperature Hexoloy{trademark} SX silicon carbide. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Srinivasan, G.V.; Lau, S.K.; Storm, R.S. [Carborundum Co., Niagara Falls, NY (United States)

    1994-09-01

    HEXOLOY{reg_sign} SX-SiC, fabricated with Y and Al containing compounds as sintering aids, has been shown to possess significantly improved strength and toughness over HEXOLOY{reg_sign}SA-SiC. This study was undertaken to establish and benchmark the complete mechanical property database of a first generation material, followed by a process optimization task to further improve the properties. Mechanical characterization on the first generation material indicated that silicon-rich pools, presumably formed as a reaction product during sintering, controlled the strength from room temperature to 1,232 C. At 1,370 C in air, the material was failing due to a glass-phase formation at the surface. This glass-phase formation was attributed to the reaction of yttrium aluminates, which exist as a second phase in the material, with the ambient. This process was determined to be a time-dependent one that leads to slow crack growth. Fatigue experiments clearly indicated that the slow crack growth driven by the reaction occurred only at temperatures >1,300 C, above the melting point of the glass phase. Process optimization tasks conducted included the selection of the best SiC powder source, studies on mixing/milling conditions for SiC powder with the sintering aids, and a designed experiment involving a range of sintering and post-treatment conditions. The optimization study conducted on the densification variables indicated that lower sintering temperatures and higher post-treatment pressures reduce the Si-rich pool formation, thereby improving the room-temperature strength. In addition, it was also determined that furnacing configuration and atmosphere were critical in controlling the Si-rich formation.

  2. Silicon-mediated resistance of Arabidopsis against powdery mildew involves mechanisms other than the salicylic acid (SA)-dependent defence pathway.

    Science.gov (United States)

    Vivancos, Julien; Labbé, Caroline; Menzies, James G; Bélanger, Richard R

    2015-08-01

    On absorption by plants, silicon (Si) offers protection against many fungal pathogens, including powdery mildews. The mechanisms by which Si exerts its prophylactic role remain enigmatic, although a prevailing hypothesis suggests that Si positively influences priming. Attempts to decipher Si properties have been limited to plants able to absorb Si, which excludes the model plant Arabidopsis because it lacks Si influx transporters. In this work, we were able to engineer Arabidopsis plants with an Si transporter from wheat (TaLsi1) and to exploit mutants (pad4 and sid2) deficient in salicylic acid (SA)-dependent defence responses to study their phenotypic response and changes in defence expression against Golovinomyces cichoracearum (Gc) following Si treatment. Our results showed that TaLsi1 plants contained significantly more Si and were significantly more resistant to Gc infection than control plants when treated with Si, the first such demonstration in a plant transformed with a heterologous Si transporter. The resistant plants accumulated higher levels of SA and expressed higher levels of transcripts encoding defence genes, thus suggesting a role for Si in the process. However, TaLsi1 pad4 and TaLsi1 sid2 plants were also more resistant to Gc than were pad4 and sid2 plants following Si treatment. Analysis of the resistant phenotypes revealed a significantly reduced production of SA and expression of defence genes comparable with susceptible controls. These results indicate that Si contributes to Arabidopsis defence priming following pathogen infection, but highlight that Si will confer protection even when priming is altered. We conclude that Si-mediated protection involves mechanisms other than SA-dependent defence responses.

  3. Water SA

    African Journals Online (AJOL)

    Journal Home > Vol 43, No 2 (2017) ... WaterSA publishes refereed, original work in all branches of water science, technology and engineering. ... Water SA is the WRC's accredited scientific journal which contains original research articles ... via linearized calibration method in the upstream of Huaihe River Basin, China ...

  4. Health SA Gesondheid

    African Journals Online (AJOL)

    Health SA Gesondheid - Journal of Interdisciplinary Health Sciences is an open access, .... Chokwe M. Setati, Zerish Z. Nkosi, 130-137 ... Movement as a critical concept in model generation to attain wholeness · EMAIL FREE FULL TEXT ...

  5. SalSA status

    Energy Technology Data Exchange (ETDEWEB)

    Connolly, Amy [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)], E-mail: amyc@hep.ucl.ac.uk

    2009-06-01

    I review the status of SalSA, a proposed antenna array in a large volume salt formation for detecting ultra-high energy neutrinos. We report on measurements taken in 2007 of attenuation lengths in the 125-900 MHz frequency range at the Cote Blanche salt mine near New Iberia, Louisiana, which is the most precise in situ measurement of attenuation lengths in salt to date. We comment on the impact of these measurements on the feasibility of SalSA.

  6. Ion-beam modifications of mechanical and dimensional properties of silicon carbide

    Science.gov (United States)

    Costantini, Jean-Marc; Kerbiriou, Xavier; Sauzay, Maxime; Thomé, Lionel

    2012-11-01

    3C-SiC single crystal epitaxial layers, 6H-SiC single crystal plates and α-SiC Hexoloy sinters were irradiated with 4.0 MeV Xe or 4.0 MeV Au ions at room temperature. Mechanical and dimensional evolutions of silicon carbide are studied by means of nano-indentation and step-height measurements which are correlated with Rutherford backscattering spectrometry and channelling (RBS/C) data in single crystals. Irradiation with Xe ions induces a total lattice disorder related to amorphization for a fluence of 1 × 1015 cm-2 in both polytypes. When complete amorphization is reached, around the same values of Young's modulus (˜350 GPa) and Berkovich hardness (˜27 GPa) are found in both polytypes. The out-of-plane expansion increases with irradiation dose and the saturation value measured in the amorphous layer (normalized to the projected range of the ions) is close to 20-25%. Modifications of macroscopic properties are mainly governed by the disordered fraction of the material in a two-step damage process. A similar behaviour of material evolution is found for the cubic and hexagonal polytypes, either in single crystals or sintered polycrystalline samples. Calculations of Young's modulus and volume swelling are carried out using the analytical (Reuss and Voigt) models of homogenization.

  7. Lewis Porter, John Coltrane. Sa vie, sa musique

    OpenAIRE

    Parent, Emmanuel

    2008-01-01

    Les éditions Outre Mesure viennent de mettre à la disposition du lectorat français, avec la qualité de mise en page et en musique qu’on leur connaît, un nouveau livre de référence en musicologie du jazz. Salué à sa sortie par la critique en langue anglaise en 1998, John Coltrane. Sa vie, sa musique constitue en effet un ouvrage fort complet pour qui veut s’immerger dans le langage du heavyweight champion. L’auteur, enseignant à Rutgers (l’université du New Jersey abritant depuis les années 19...

  8. Silicon spintronics.

    Science.gov (United States)

    Jansen, Ron

    2012-04-23

    Worldwide efforts are underway to integrate semiconductors and magnetic materials, aiming to create a revolutionary and energy-efficient information technology in which digital data are encoded in the spin of electrons. Implementing spin functionality in silicon, the mainstream semiconductor, is vital to establish a spin-based electronics with potential to change information technology beyond imagination. Can silicon spintronics live up to the expectation? Remarkable advances in the creation and control of spin polarization in silicon suggest so. Here, I review the key developments and achievements, and describe the building blocks of silicon spintronics. Unexpected and puzzling results are discussed, and open issues and challenges identified. More surprises lie ahead as silicon spintronics comes of age.

  9. Meta Analisis sa Pagsusuri ng Maiikling Kwento sa mga Tesis at Disertasyon

    Directory of Open Access Journals (Sweden)

    Regina I. Cuizon

    2014-10-01

    Full Text Available Anumang mga pagbabago na makikita sa mundo ay bunga ng pananaliksik. Ang meta-analisis ay isa sa mga bunga ng pananaliksik na ginagamit sa kasalukuyan bilang teknik upang malaman iba pang mga nagsulputang informasyon. Ito’y pag-aaral sa mga pag-aaral. Isang kritikal at sistematikong pagsusuri sa istruktura ng mga pag-aaral. Maging gabay sa mga gradwadong paaralan sa pagpili ng paksang pagaaralan. Pangunahing layunin na matiyak ang mga pamamaraan sa pagsusuri ng maiikling kwento ng mga tesis at disertasyong nagawa mula sa mga piling SUCs. Desinyong kwalitatibo - kontent analisis sa pagsusuri ng: kaanyuan ayon sa suliranin, metodolohiya, paglalahad at interpretasyon ng mga datos, natuklasan, konklusyon, at rekomendasyon; kahinatnan ayon sa pagkatulad, pagkakaiba at kabuluhan; Emerging tema. Napag-alaman na ang karaniwang pinag-aralan ay 30% kahalagahang pangkatauhan, 20% larawangdiwa ng mga kababaihan at 10% gramatikang aspeto. Sa metodolohiyang ginamit, 80% desinyong kwalitatibo at 20% kwantitatibo-kwalitatibo. Sa paglikom ng datos 60% diretsahang pagsusuri, 30% talatanungan at 10% tseklis. Sa pag-analisa 90% kontent analisis at 10% gramatikal analisis. Batay sa natuklasan, ang pagsusuri ng maiikling kwento sa mga tesis at disertasyon mula sa iba’t ibang paaralan gamit ang meta analisis ay isang epektibo, mabisa, objektibong paraan at kagamitan na magagamit sa makatarungang paghatol; pamumuna sa kabuluhan at kagandahan; paghaham- bing sa mga kritikal na isyu; at pormulasyon ng panibagong pamantayan at batas.

  10. Planejamento em Saúde

    Directory of Open Access Journals (Sweden)

    Antonio José Costa CARDOSO

    2014-03-01

    Full Text Available Esse texto pretendeu subsidiar aula sobre Planejamento e Avaliação em Saúde para os Analistas Técnicos de Políticas Sociais lotados no Ministério da Saúde (MS, na perspectiva de promover uma maior compreensão dos antecedentes históricos do planejamento em saúde no Brasil e na América Latina, do referencial teórico metodológico do planejamento estratégico e participativo, e refletir sobre os avanços e desafios que se apresentam no atual contexto de construção do Sistema Único de Saúde (SUS. Neste sentido, foi estruturado na perspectiva de responder a três questões orientadoras: 1 Como tem se dado esse processo de coordenação do Planejamento Estratégico Nacional no âmbito do SUS, em cooperação técnica com os Estados, Municípios e Distrito Federal? 2 Quais são as tecnologias de gestão e planejamento em saúde adotadas pelo MS para conduzir esses processos de forma integrada? 3 Como se dá o gerenciamento das ações no MS? Como os planos, projetos e programas são monitorados pelas equipes responsáveis?

  11. A Robust Separation Assurance (SA) Architecture Using Integrated Airborne and Ground SA Concepts Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Intelligent Automation, Inc. proposes a robust SA architecture that uses integrated airborne and ground-based SA concepts such that SA functions are switched between...

  12. Cerditos Company S.A.

    OpenAIRE

    2010-01-01

    Esta idea de negocio consiste en la adecuación de una granja, en la cual se desarrollará el proceso de levante y comercialización de carne de cerdo en pie o en canal. Cerditos Company S.A. es una empresa que busca la calidad y el buen servicio, brindando al consumidor garantías de la carne que está consumiendo. En Colombia el mercado ha sido poco explotado comparado con otros países como Chile o Europa, donde el consumo es muy significativo, Cerditos Company S.A. busca aumentar el cons...

  13. ANALISIS DAYA SAING KEDELAI INDONESIA

    Directory of Open Access Journals (Sweden)

    Sarwono Sarwono

    2014-09-01

    Full Text Available RCA (Revealed Comparative Advantage index of soybean in Indonesia from 1983 up to 2013 is less than one, mostly. It means that the competitiveness of soybean in Indonesia is low. The purpose of this study is to analyze the factors influence the soybean competitiveness. OLS (Ordinary Least Square was used as the analysis method. Hypotheses test based on that analysis model is not bias, so that, classic divergence test is needed. It is for getting the Best Linier Unbiased Estimator (BLUE appraisal. T statistic and F statistic were also applied. The result of this research shows that production and export have positive and significant influence. In addition, exchange rate and government policy do not influence the Indonesia soybean competitiveness.Indeks RCA (Revealed Comparative Advantage kedelai Indonesia dari tahun 1983-2013 kecenderungan bernilai kurang dari satu yang berarti daya saing kedelai Indonesia rendah.Penelitian ini bertujuan untuk menganalisis faktor-faktor yang mempengaruhi daya saing kedelai Indonesia.Metode analisis yang digunakan adalah Ordinary Least Square (OLS.Pengujian hipotesis berdasarkan model analisis tersebut tidak bias maka perlu dilakukan uji penyimpangan klasik yang tujuannya agar diperoleh penaksiran yang bersifat Best Linier Unbiased Estimator (BLUE.Pengujian statistik menggunakan uji t statistikdan uji f statistik.Hasil penelitian ini menunjukkan bahwa produksi dan ekspor berpengaruh secara positif dan signifikan terhadap daya saing kedelai Indonesia. Nilai tukar rupiah dan kebijakan pemerintah tidak berpengaruh terhadap daya saing kedelai Indonesia.

  14. Advantages of gated silicon single photon detectors

    Science.gov (United States)

    Legré, Matthieu; Lunghi, Tommaso; Stucki, Damien; Zbinden, Hugo

    2013-05-01

    We present gated silicon single photon detectors based on two commercially available avalanche photodiodes (APDs) and one customised APD from ID Quantique SA. This customised APD is used in a commercially available device called id110. A brief comparison of the two commercial APDs is presented. Then, the charge persistence effect of all of those detectors that occurs just after a strong illumination is shown and discussed.

  15. Saúde e desenvolvimento

    Directory of Open Access Journals (Sweden)

    Ana Luiza D'Ávila Viana

    Full Text Available Considerando que os modernos sistemas de saúde são o resultado da complexa interação de processos econômicos, políticos e sociais, o objetivo do trabalho é discutir a relação entre saúde e desenvolvimento no Brasil, mostrando que o esgotamento do modelo liberal de política econômica abre nova perspectiva para a retomada do desenvolvimento, entendido como combinação entre crescimento da economia, mudanças na estrutura produtiva e melhora das condições de vida da população. O complexo produtivo da saúde joga papel decisivo nesse processo, pois constitui um campo em que inovação tecnológica e acumulação de capital geram oportunidades de investimento, trabalho e renda, além de produzir avanços importantes para melhorar o estado de saúde das pessoas. A recente adoção de políticas públicas voltadas para articular, de forma positiva, aspectos da política econômica e da política social revela que a questão do desenvolvimento nacional ganhou nova centralidade na agenda governamental, o que abre a perspectiva de maior integração entre a lógica econômica e a lógica sanitária. Entretanto, é preciso reconhecer que o Brasil ainda não logrou alcançar uma associação virtuosa entre saúde e desenvolvimento.

  16. Varyasyong Leksikal sa mga Dayalektong Mandaya

    Directory of Open Access Journals (Sweden)

    Dr. Raymund M. Pasion

    2014-12-01

    Full Text Available Layuning panlahat sa pag-aaral na ito na tuklasin ang varyasyong leksikalsa Wikang Mandaya na matatagpuan sa Probinsyang Davao Oriental. Bilang lunsaran sa paglilikom ng mga datos, ginamit ang mga terminong kultural na pangkabuhayan tulad ng pagsasaka, pangangaso, pangingisda at paghahayupan nanababatay sa Indigenous Knowledge System and Practices (IKSP.Sinikap sagutin sa pagaaral ang suliraning ano-anong varyasyong liksikal ang makikita sa mga terminong kultural na pangkabuhayan ng Mandaya na makikita sa munisipalidad ng Caraga, Manay, Bagangaat Cateel? Disenyong kwalitatibo ginamit.Metodong indehinusat deskriptibo naman ang ginamit mula sa paglilikom hanggang sa pag-aanalisa ng mga datos. Samantalang, ang mga impormante ay pinilisa pamamagitan ng kombinasyong purposive at snow-ball sampling. Natuklasan, na ang wikang Mandaya ay nakitaan ng varyasyong lekisikal ayon sa magkakaiba ang anyo, may pagkakatulad ang anyo, at magkakatulad ang anyo subalit magkakaiba ang bigkas. Gayunpaman, pinaniniwalaang dahil sa paktor na heograpikal, sikolohikal at sosyolohikal na nagaganap sa kanilang kultura ay hindi rin maipagkailang nagyari ang varyasyong leksikal na aspekto nito.

  17. Silicon Spintronics

    NARCIS (Netherlands)

    Jansen, R.

    2008-01-01

    Integration of magnetism and mainstream semiconductor electronics could impact information technology in ways beyond imagination. A pivotal step is implementation of spin-based electronic functionality in silicon devices. Remarkable progress made during the last two years gives confidence that this

  18. Lithographically patterned silicon nanostructures on silicon substrates

    Energy Technology Data Exchange (ETDEWEB)

    Megouda, Nacera [Institut de Recherche Interdisciplinaire (IRI, USR 3078), Universite Lille1, Parc de la Haute Borne, 50 Avenue de Halley-BP 70478, 59658 Villeneuve d' Ascq and Institut d' Electronique, de Microelectronique et de Nanotechnologie (IEMN, CNRS-8520), Cite Scientifique, Avenue Poincare-B.P. 60069, 59652 Villeneuve d' Ascq (France); Faculte des Sciences, Universite Mouloud Mammeri, Tizi-Ouzou (Algeria); Unite de Developpement de la Technologie du Silicium (UDTS), 2 Bd. Frantz Fanon, B.P. 140 Alger-7 merveilles, Alger (Algeria); Piret, Gaeelle; Galopin, Elisabeth; Coffinier, Yannick [Institut de Recherche Interdisciplinaire (IRI, USR 3078), Universite Lille1, Parc de la Haute Borne, 50 Avenue de Halley-BP 70478, 59658 Villeneuve d' Ascq and Institut d' Electronique, de Microelectronique et de Nanotechnologie (IEMN, CNRS-8520), Cite Scientifique, Avenue Poincare-B.P. 60069, 59652 Villeneuve d' Ascq (France); Hadjersi, Toufik, E-mail: hadjersi@yahoo.com [Unite de Developpement de la Technologie du Silicium (UDTS), 2 Bd. Frantz Fanon, B.P. 140 Alger-7 merveilles, Alger (Algeria); Elkechai, Omar [Faculte des Sciences, Universite Mouloud Mammeri, Tizi-Ouzou (Algeria); and others

    2012-06-01

    The paper reports on controlled formation of silicon nanostructures patterns by the combination of optical lithography and metal-assisted chemical dissolution of crystalline silicon. First, a 20 nm-thick gold film was deposited onto hydrogen-terminated silicon substrate by thermal evaporation. Gold patterns (50 {mu}m Multiplication-Sign 50 {mu}m spaced by 20 {mu}m) were transferred onto the silicon wafer by means of photolithography. The etching process of crystalline silicon in HF/AgNO{sub 3} aqueous solution was studied as a function of the silicon resistivity, etching time and temperature. Controlled formation of silicon nanowire arrays in the unprotected areas was demonstrated for highly resistive silicon substrate, while silicon etching was observed on both gold protected and unprotected areas for moderately doped silicon. The resulting layers were characterized using scanning electron microscopy (SEM).

  19. Lingon sa Iskolarsyip sa Dulaan (1948-2007 Looking Back on Theater Scholarship (1948-2007

    Directory of Open Access Journals (Sweden)

    Apolonio B. Chua

    2012-12-01

    Full Text Available From 1948 to 2007, the academic community produced about a hundred titles of theses and dissertations on drama and theater, or made use of data from drama and theater for larger spheres of studies. The current article looked into identifying trends and points of emphasis, as the researches and studies progressed through roughly half a century of research production in the academic setting. Inductive in approach and tentative and exploratory in its analysis, the study identified four trends and points of emphasis in research production. In the fifties and sixties, the emphasis was more on studying the play text or drama; studies veered towards a literary reading and orientation. Eventually, this trend gave way to studying the larger phenomenon of mounting, and the mise en scéne and the spectator became additional units of concern for research. Studies began to have sections on props, costumes, and staging techniques. In the eighties, a larger concern for looking at theater as social production followed. Participant observation, field work and ethnography gave equal emphasis on the social context of theater. Marxism and other perspectives from the social sciences framed theater studies then; correlations between theater and society became useful. Towards the last decade of the century, theater studies aimed at a more conceptual approach, emphasizing core concepts like panata and other related or equivalent terms, elevating and defining the study of theater as a study of culture itself. Gamit ang mahigit sa sandaang tesis at disertasyon hinggil sa dula at dulaan o sinasangkot ang mga ito na lumabas sa akademya mula 1948 hanggang 2007, kapwa sa Unibersidad ng Pilipinas at sa iba pa, nilayon ng “Lingon sa Iskolarsyip sa Dulaan (1948-2007” na pulsuhan ang pangkalahatang daloy, tutok, tunguhin o kalakaran sa pagdadala ng mga pag-aaral. Panimula at exploratory sa inductive nitong lapat, nakatukoy ang pag-aaral ng apat na sapit o tutok sa daloy ng

  20. Space Environment Effects on Silicone Seal Materials

    Science.gov (United States)

    deGroh, Henry C., III; Daniels, Christopher C.; Dever, Joyce A.; Miller, Sharon K.; Waters, Deborah L.; Finkbeiner, Joshua R.; Dunlap, Patrick H.; Steinetz, Bruce M.

    2010-01-01

    A docking system is being developed by the NASA to support future space missions. It is expected to use redundant elastomer seals to help contain cabin air during dockings between two spacecraft. The sealing surfaces are exposed to the space environment when vehicles are not docked. In space, the seals will be exposed to temperatures between 125 to -75 C, vacuum, atomic oxygen, particle and ultraviolet radiation, and micrometeoroid and orbital debris (MMOD). Silicone rubber is the only class of space flight-qualified elastomeric seal material that functions across the expected temperature range. NASA Glenn has tested three silicone elastomers for such seal applications: two provided by Parker (S0899-50 and S0383-70) and one from Esterline (ELA-SA-401). The effects of atomic oxygen (AO), UV and electron particle radiation, and vacuum on the properties of these three elastomers were examined. Critical seal properties such as leakage, adhesion, and compression set were measured before and after simulated space exposures. The S0899-50 silicone was determined to be inadequate for extended space seal applications due to high adhesion and intolerance to UV, but both S0383-70 and ELA-SA-401 seals were adequate.

  1. Finite element analysis of (SA) mechanoreceptors in tactile sensing application

    Science.gov (United States)

    N, Syamimi; Yahud, S.

    2015-05-01

    This paper addresses the structural design of a fingertip model in order to analyse the sensory function of slow adapting (SA) mechanoreceptors by using the finite element analysis (FEA) method. A biologically inspired tactile sensor was designed to mimic a similar response of the human mechanoreceptors in the human glabrous skin. The simulation work was done by using COMSOL Multiphysics. The artificial skin was modelled as a solid square block of silicone elastomer with a semi cylinder protrusion on top. It was modelled as a nearly incompressible and linear hyperelastic material defined by Neo Hookean constitutive law. The sensing element on the other hand was modelled by using constantan alloy mimicking the SA1 receptor. Boundary loads of 1 N/m² to 4 N/m² with the increment of 1 N/m² were applied to the top surface of the protrusion in z and x-direction for normal and shear stress, respectively. The epidermal model base was constrained to maintain the same boundary conditions throughout all simulations. The changes of length experienced by the sensing element were calculated. The simulations result in terms of strain was identified. The simulated result was plotted in terms of sensing element strain against the boundary load and the graph should produce a linear response.

  2. The preliminary study of autophagy induction of SA and MeSA by confocal

    Science.gov (United States)

    Yun, Lijuan; Chen, Wenli

    2010-02-01

    Autophagy appears to be a highly conserved process from unicellular to multicellular eukaryotes which contributes to the equilibrium of intracelluar environment. While it would be harmful to the cells when it is excessive by inducing programmed cell death (PCD). It is a protein degradation process in which cells recycle cytoplasmic contents when subjected to environmental stress conditions or during certain stages of development. Previous studies have demonstrated autophagy can be induced during abiotic or biotic stresses. salicylic acid (SA) and methyl salicytic (MeSA) are endogenous signal molecules. We found SA and MeSA can induce autophagy in Arabidopsis thaliana respectively. While autophagy was not induced by SA or MeSA in tobacco suspension cells under the same concentration and period. The differences in stuctures or physiological states may contribute to the results.

  3. SA3654 Component characterization. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Meir, G.W.

    1996-06-01

    AlliedSignal Inc., Federal Manufacturing & Technologies (FM&T), was provided with production capability assurance program (PCAP) funding to develop, characterize, and qualify purchased product components for use on the PRESS-A program. The SA3654, N-Channel, Power MOSFET was identified as a component needing such activity to support PRESS-A. This report presents the characterization activities and results for the SA3654.

  4. SaVi: satellite constellation visualization

    CERN Document Server

    Wood, Lloyd

    2012-01-01

    SaVi, a program for visualizing satellite orbits, movement, and coverage, is maintained at the University of Surrey. This tool has been used for research in academic papers, and by industry companies designing and intending to deploy satellite constellations. It has also proven useful for demonstrating aspects of satellite constellations and their geometry, coverage and movement for educational and teaching purposes. SaVi is introduced and described briefly here.

  5. Åsa portreed / Åsa Johannesson ; intervjueerinud Kaisa Eiche

    Index Scriptorium Estoniae

    Johannesson, Åsa

    2009-01-01

    Rootsi fotograafist Åsa Johannessonist, kelle portreefotode seeriat "Portraits of Her" eksponeeriti Riias toimunud kunstiüritusel "MOMENT". Tema õpingutest ja elust Londonis. Naiselikkusest ja mehelikkusest

  6. Åsa portreed / Åsa Johannesson ; intervjueerinud Kaisa Eiche

    Index Scriptorium Estoniae

    Johannesson, Åsa

    2009-01-01

    Rootsi fotograafist Åsa Johannessonist, kelle portreefotode seeriat "Portraits of Her" eksponeeriti Riias toimunud kunstiüritusel "MOMENT". Tema õpingutest ja elust Londonis. Naiselikkusest ja mehelikkusest

  7. Doping Silicon Wafers with Boron by Use of Silicon Paste

    Institute of Scientific and Technical Information of China (English)

    Yu Gao; Shu Zhou; Yunfan Zhang; Chen Dong; Xiaodong Pi; Deren Yang

    2013-01-01

    In this work we introduce recently developed silicon-paste-enabled p-type doping for silicon.Boron-doped silicon nanoparticles are synthesized by a plasma approach.They are then dispersed in solvents to form silicon paste.Silicon paste is screen-printed at the surface of silicon wafers.By annealing,boron atoms in silicon paste diffuse into silicon wafers.Chemical analysis is employed to obtain the concentrations of boron in silicon nanoparticles.The successful doping of silicon wafers with boron is evidenced by secondary ion mass spectroscopy (SIMS) and sheet resistance measurements.

  8. Silicon: electrochemistry and luminescence

    NARCIS (Netherlands)

    Kooij, Ernst Stefan

    1997-01-01

    The electrochemistry of crystalline and porous silicon and the luminescence from porous silicon has been studied. One chapter deals with a model for the anodic dissolution of silicon in HF solution. In following chapters both the electrochemistry and various ways of generating visible luminescenc

  9. Silicon: electrochemistry and luminescence

    NARCIS (Netherlands)

    Kooij, Ernst Stefan

    1997-01-01

    The electrochemistry of crystalline and porous silicon and the luminescence from porous silicon has been studied. One chapter deals with a model for the anodic dissolution of silicon in HF solution. In following chapters both the electrochemistry and various ways of generating visible

  10. Silicon: electrochemistry and luminescence

    NARCIS (Netherlands)

    Kooij, Ernst Stefan

    2001-01-01

    The electrochemistry of crystalline and porous silicon and the luminescence from porous silicon has been studied. One chapter deals with a model for the anodic dissolution of silicon in HF solution. In following chapters both the electrochemistry and various ways of generating visible luminescenc

  11. The chemistry of silicon

    CERN Document Server

    Rochow, E G; Emeléus, H J; Nyholm, Ronald

    1975-01-01

    Pergamon Texts in Organic Chemistry, Volume 9: The Chemistry of Silicon presents information essential in understanding the chemical properties of silicon. The book first covers the fundamental aspects of silicon, such as its nuclear, physical, and chemical properties. The text also details the history of silicon, its occurrence and distribution, and applications. Next, the selection enumerates the compounds and complexes of silicon, along with organosilicon compounds. The text will be of great interest to chemists and chemical engineers. Other researchers working on research study involving s

  12. Evaluation of hardness and surface roughness of two maxillofacial silicones following disinfection

    OpenAIRE

    2009-01-01

    The purpose of this study was to evaluate the Shore A hardness and surface roughness of two silicones for maxillofacial prosthetic treatment, under the influence of chemical disinfection and storage. Twenty-eight specimens were obtained, half of which were made of Silastic MDX 4-4210 silicone and, the other half were made of Silastic 732 RTV silicone. The specimens were divided into four groups: Silastic 732 RTV and MDX 4-4210 with disinfection 3 times a week with Efferdent tablets and the sa...

  13. A Generalized Eigensolver based on Smoothed Aggregation (GES-SA) for Initializing Smoothed Aggregation Multigrid (SA)

    Energy Technology Data Exchange (ETDEWEB)

    Brezina, M; Manteuffel, T; McCormick, S; Ruge, J; Sanders, G; Vassilevski, P S

    2007-05-31

    Consider the linear system Ax = b, where A is a large, sparse, real, symmetric, and positive definite matrix and b is a known vector. Solving this system for unknown vector x using a smoothed aggregation multigrid (SA) algorithm requires a characterization of the algebraically smooth error, meaning error that is poorly attenuated by the algorithm's relaxation process. For relaxation processes that are typically used in practice, algebraically smooth error corresponds to the near-nullspace of A. Therefore, having a good approximation to a minimal eigenvector is useful to characterize the algebraically smooth error when forming a linear SA solver. This paper discusses the details of a generalized eigensolver based on smoothed aggregation (GES-SA) that is designed to produce an approximation to a minimal eigenvector of A. GES-SA might be very useful as a standalone eigensolver for applications that desire an approximate minimal eigenvector, but the primary aim here is for GES-SA to produce an initial algebraically smooth component that may be used to either create a black-box SA solver or initiate the adaptive SA ({alpha}SA) process.

  14. Chemical Analysis Methods for Silicon Carbide

    Institute of Scientific and Technical Information of China (English)

    Shen Keyin

    2006-01-01

    @@ 1 General and Scope This Standard specifies the determination method of silicon dioxide, free silicon, free carbon, total carbon, silicon carbide, ferric sesquioxide in silicon carbide abrasive material.

  15. Glass-silicon column

    Energy Technology Data Exchange (ETDEWEB)

    Yu, Conrad M.

    2003-12-30

    A glass-silicon column that can operate in temperature variations between room temperature and about 450.degree. C. The glass-silicon column includes large area glass, such as a thin Corning 7740 boron-silicate glass bonded to a silicon wafer, with an electrode embedded in or mounted on glass of the column, and with a self alignment silicon post/glass hole structure. The glass/silicon components are bonded, for example be anodic bonding. In one embodiment, the column includes two outer layers of silicon each bonded to an inner layer of glass, with an electrode imbedded between the layers of glass, and with at least one self alignment hole and post arrangement. The electrode functions as a column heater, and one glass/silicon component is provided with a number of flow channels adjacent the bonded surfaces.

  16. Porous silicon gettering

    Energy Technology Data Exchange (ETDEWEB)

    Tsuo, Y.S.; Menna, P.; Al-Jassim, M. [National Renewable Energy Lab., Golden, CO (United States)] [and others

    1995-08-01

    We have studied a novel extrinsic gettering method that utilizes the very large surface areas, produced by porous silicon etch on both front and back surfaces of the silicon wafer, as gettering sites. In this method, a simple and low-cost chemical etching is used to generate the porous silicon layers. Then, a high-flux solar furnace (HFSF) is used to provide high-temperature annealing and the required injection of silicon interstitials. The gettering sites, along with the gettered impurities, can be easily removed at the end the process. The porous silicon removal process consists of oxidizing the porous silicon near the end the gettering process followed by sample immersion in HF acid. Each porous silicon gettering process removes up to about 10 {mu}m of wafer thickness. This gettering process can be repeated so that the desired purity level is obtained.

  17. Growth model of lantern-like amorphous silicon oxide nanowires

    Science.gov (United States)

    Wu, Ping; Zou, Xingquan; Chi, Lingfei; Li, Qiang; Xiao, Tan

    2007-03-01

    Silicon oxide nanowire assemblies with lantern-like morphology were synthesized by thermal evaporation of the mixed powder of SnO2 and active carbon at 1000 °C and using the silicon wafer as substrate and source. The nano-lanterns were characterized by a scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), energy-dispersive spectroscope (EDS) and selective area electron diffraction (SAED). The results show that the nano-lantern has symmetrical morphology, with one end connecting with the silicon wafer and the other end being the tin ball. The diameter of the nano-lantern is about 1.5-3.0 µm. Arc silicon oxide nanowire assemblies between the two ends have diameters ranging from 70 to 150 nm. One single catalyst tin ball catalyzes more than one amorphous nanowires' growth. In addition, the growth mechanism of the nano-lantern is discussed and a growth model is proposed. The multi-nucleation sites round the Sn droplet's perimeter are responsible for the formation of many SiOx nanowires. The growing direction of the nanowires is not in the same direction of the movement of the catalyst tin ball, resulting in the bending of the nanowires and forming the lantern-like silicon oxide morphology. The controllable synthesis of the lantern-like silicon oxide nanostructure may have potential applications in the photoelectronic devices field.

  18. Growth model of lantern-like amorphous silicon oxide nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Wu Ping; Zou Xingquan; Chi Lingfei; Li Qiang; Xiao Tan [Department of Physics, Shantou University, Shantou 515063 (China)

    2007-03-28

    Silicon oxide nanowire assemblies with lantern-like morphology were synthesized by thermal evaporation of the mixed powder of SnO{sub 2} and active carbon at 1000 deg. C and using the silicon wafer as substrate and source. The nano-lanterns were characterized by a scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), energy-dispersive spectroscope (EDS) and selective area electron diffraction (SAED). The results show that the nano-lantern has symmetrical morphology, with one end connecting with the silicon wafer and the other end being the tin ball. The diameter of the nano-lantern is about 1.5-3.0 {mu}m. Arc silicon oxide nanowire assemblies between the two ends have diameters ranging from 70 to 150 nm. One single catalyst tin ball catalyzes more than one amorphous nanowires' growth. In addition, the growth mechanism of the nano-lantern is discussed and a growth model is proposed. The multi-nucleation sites round the Sn droplet's perimeter are responsible for the formation of many SiO{sub x} nanowires. The growing direction of the nanowires is not in the same direction of the movement of the catalyst tin ball, resulting in the bending of the nanowires and forming the lantern-like silicon oxide morphology. The controllable synthesis of the lantern-like silicon oxide nanostructure may have potential applications in the photoelectronic devices field.

  19. Atlas mundial da saúde

    OpenAIRE

    Barrozo, Ligia Vizeu

    2009-01-01

    O Atlas é de autoria de Zoé Vaillant, mestre de conferências da Universidade Paris-Ouest-Nanterre-La Défense e membro do laboratório Espaço, Saúde e Territórios e de Gérard Salem, professor de geografia da saúde da Universidade Paris-Ouest-Nanterre-La Défense e coordenador do laboratório Espaço, Saúde e Territórios. Cécile Marin, responsável pela cartografia do Atlas, é geógrafa-cartógrafa, formada pela Universidade d’Orléans. O Atlas mondial de la santé faz parte da série Collection Atlas/M...

  20. Silicon micro-mold

    Science.gov (United States)

    Morales, Alfredo M.

    2006-10-24

    The present invention describes a method for rapidly fabricating a robust 3-dimensional silicon-mold for use in preparing complex metal micro-components. The process begins by depositing a conductive metal layer onto one surface of a silicon wafer. A thin photoresist and a standard lithographic mask are then used to transfer a trace image pattern onto the opposite surface of the wafer by exposing and developing the resist. The exposed portion of the silicon substrate is anisotropically etched through the wafer thickness down to conductive metal layer to provide an etched pattern consisting of a series of rectilinear channels and recesses in the silicon which serve as the silicon micro-mold. Microcomponents are prepared with this mold by first filling the mold channels and recesses with a metal deposit, typically by electroplating, and then removing the silicon micro-mold by chemical etching.

  1. SILICON CARBIDE FOR SEMICONDUCTORS

    Science.gov (United States)

    This state-of-the-art survey on silicon carbide for semiconductors includes a bibliography of the most important references published as of the end...of 1964. The various methods used for growing silicon carbide single crystals are reviewed, as well as their properties and devices fabricated from...them. The fact that the state of-the-art of silicon carbide semiconductors is not further advanced may be attributed to the difficulties of growing

  2. Silicon Carbide Shapes.

    Science.gov (United States)

    Free-standing silicon carbide shapes are produced by passing a properly diluted stream of a reactant gas, for example methyltrichlorosilane, into a...reaction chamber housing a thin walled, hollow graphite body heated to 1300-1500C. After the graphite body is sufficiently coated with silicon carbide , the...graphite body is fired, converting the graphite to gaseous CO2 and CO and leaving a silicon carbide shaped article remaining.

  3. Studies of the aggregation of RNase Sa

    DEFF Research Database (Denmark)

    Khasa, Harshit; Kramer, Ryan; Maddux, Nathan

    2014-01-01

    Thirty-eight mutants of RNase Sa (ribonuclease from Streptomyces aureofaciens) were examined for their structure, thermal sensitivity, and tendency to aggregate. Although a biphasic correlation was seen between the effect of temperature on structure and the free energy of transfer changes in many...

  4. Novel Silicon Nanotubes

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Novel silicon nanotubes with inner-diameter of 60-80 nm was prepared using hydrogen-added dechlorination of SiCl4 followed by chemical vapor deposition (CVD) on a NixMgyO catalyst. The TEM observation showed that the suitable reaction temperature is 973 K for the formation of silicon nanotubes. Most of silicon nanotubes have one open end and some have two closed ends. The shape ofnanoscale silicon, however, is a micro-crystal type at 873 K, a rod or needle type at 993 K and an onion-type at 1023 K, respectively.

  5. Breast Implants: Saline vs. Silicone

    Science.gov (United States)

    ... differ in material and consistency, however. Saline breast implants Saline implants are filled with sterile salt water. ... of any age for breast reconstruction. Silicone breast implants Silicone implants are pre-filled with silicone gel — ...

  6. Nonlinear silicon photonics

    Science.gov (United States)

    Borghi, M.; Castellan, C.; Signorini, S.; Trenti, A.; Pavesi, L.

    2017-09-01

    Silicon photonics is a technology based on fabricating integrated optical circuits by using the same paradigms as the dominant electronics industry. After twenty years of fervid development, silicon photonics is entering the market with low cost, high performance and mass-manufacturable optical devices. Until now, most silicon photonic devices have been based on linear optical effects, despite the many phenomenologies associated with nonlinear optics in both bulk materials and integrated waveguides. Silicon and silicon-based materials have strong optical nonlinearities which are enhanced in integrated devices by the small cross-section of the high-index contrast silicon waveguides or photonic crystals. Here the photons are made to strongly interact with the medium where they propagate. This is the central argument of nonlinear silicon photonics. It is the aim of this review to describe the state-of-the-art in the field. Starting from the basic nonlinearities in a silicon waveguide or in optical resonator geometries, many phenomena and applications are described—including frequency generation, frequency conversion, frequency-comb generation, supercontinuum generation, soliton formation, temporal imaging and time lensing, Raman lasing, and comb spectroscopy. Emerging quantum photonics applications, such as entangled photon sources, heralded single-photon sources and integrated quantum photonic circuits are also addressed at the end of this review.

  7. Nonlinear silicon photonics

    Science.gov (United States)

    Tsia, Kevin K.; Jalali, Bahram

    2010-05-01

    An intriguing optical property of silicon is that it exhibits a large third-order optical nonlinearity, with orders-ofmagnitude larger than that of silica glass in the telecommunication band. This allows efficient nonlinear optical interaction at relatively low power levels in a small footprint. Indeed, we have witnessed a stunning progress in harnessing the Raman and Kerr effects in silicon as the mechanisms for enabling chip-scale optical amplification, lasing, and wavelength conversion - functions that until recently were perceived to be beyond the reach of silicon. With all the continuous efforts developing novel techniques, nonlinear silicon photonics is expected to be able to reach even beyond the prior achievements. Instead of providing a comprehensive overview of this field, this manuscript highlights a number of new branches of nonlinear silicon photonics, which have not been fully recognized in the past. In particular, they are two-photon photovoltaic effect, mid-wave infrared (MWIR) silicon photonics, broadband Raman effects, inverse Raman scattering, and periodically-poled silicon (PePSi). These novel effects and techniques could create a new paradigm for silicon photonics and extend its utility beyond the traditionally anticipated applications.

  8. Periodically poled silicon

    Science.gov (United States)

    Hon, Nick K.; Tsia, Kevin K.; Solli, Daniel R.; Khurgin, Jacob B.; Jalali, Bahram

    2010-02-01

    Bulk centrosymmetric silicon lacks second-order optical nonlinearity χ(2) - a foundational component of nonlinear optics. Here, we propose a new class of photonic device which enables χ(2) as well as quasi-phase matching based on periodic stress fields in silicon - periodically-poled silicon (PePSi). This concept adds the periodic poling capability to silicon photonics, and allows the excellent crystal quality and advanced manufacturing capabilities of silicon to be harnessed for devices based on χ(2)) effects. The concept can also be simply achieved by having periodic arrangement of stressed thin films along a silicon waveguide. As an example of the utility, we present simulations showing that mid-wave infrared radiation can be efficiently generated through difference frequency generation from near-infrared with a conversion efficiency of 50% based on χ(2) values measurements for strained silicon reported in the literature [Jacobson et al. Nature 441, 199 (2006)]. The use of PePSi for frequency conversion can also be extended to terahertz generation. With integrated piezoelectric material, dynamically control of χ(2)nonlinearity in PePSi waveguide may also be achieved. The successful realization of PePSi based devices depends on the strength of the stress induced χ(2) in silicon. Presently, there exists a significant discrepancy in the literature between the theoretical and experimentally measured values. We present a simple theoretical model that produces result consistent with prior theoretical works and use this model to identify possible reasons for this discrepancy.

  9. ALICE silicon strip module

    CERN Multimedia

    Maximilien Brice

    2006-01-01

    This small silicon detector strip will be inserted into the inner tracking system (ITS) on the ALICE detector at CERN. This detector relies on state-of-the-art particle tracking techniques. These double-sided silicon strip modules have been designed to be as lightweight and delicate as possible as the ITS will eventually contain five square metres of these devices.

  10. SILICON CARBIDE DATA SHEETS

    Science.gov (United States)

    These data sheets present a compilation of a wide range of electrical, optical and energy values for alpha and beta- silicon carbide in bulk and film...spectrum. Energy data include energy bands, energy gap and energy levels for variously-doped silicon carbide , as well as effective mass tables, work

  11. Silicon Valley Ecosystem

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2005-01-01

    @@ It is unlikely that any industrial region of the world has received as much scrutiny and study as Silicon Valley. Despite the recent crash of Internet and telecommunications stocks,Silicon Valley remains the world's engine of growth for numerous high-technology sectors.

  12. Effects of Atomic Oxygen and Grease on Outgassing and Adhesion of Silicone Elastomers for Space Applications

    Science.gov (United States)

    deGroh, Henry C., III; Puleo, Bernadette J.; Steinetz, Bruce M.

    2012-01-01

    An investigation of silicone elastomers for seals used in docking and habitat systems for future space exploration vehicles is being conducted at NASA. For certain missions, NASA is considering androgynous docking systems where two vehicles each having a seal would be required to: dock for a period of time, seal effectively, and then separate with minimum push-off forces for undocking. Silicone materials are generally chosen for their wide operating temperatures and low leakage rates. However silicone materials are often sticky and usually exhibit considerable adhesion when mated against metals and silicone surfaces. This paper investigates the adhesion unit pressure for a space rated silicone material (S0383-70) for either seal-on-seal (SoS) or seal-on-aluminum (SoAl) operation modes in the following conditions: as-received, after ground-based atomic-oxygen (AO) pre-treatment, after application of a thin coating of a space-qualified grease (Braycote 601EF), and after a combination of AO pre-treatment and grease coating. In order of descending adhesion reduction, the AO treatment reduced seal adhesion the most, followed by the AO plus grease pre-treatment, followed by the grease treatment. The effects of various treatments on silicone (S0383-70 and ELA-SA-401) outgassing properties were also investigated. The leading adhesion AO pretreatment reduction led to a slight decrease in outgassing for the S0383-70 material and virtually no change in ELA-SA-401 outgassing.

  13. Photoluminescence of Silicon Nanocrystals in Silicon Oxide

    Directory of Open Access Journals (Sweden)

    L. Ferraioli

    2007-01-01

    Full Text Available Recent results on the photoluminescence properties of silicon nanocrystals embedded in silicon oxide are reviewed and discussed. The attention is focused on Si nanocrystals produced by high-temperature annealing of silicon rich oxide layers deposited by plasma-enhanced chemical vapor deposition. The influence of deposition parameters and layer thickness is analyzed in detail. The nanocrystal size can be roughly controlled by means of Si content and annealing temperature and time. Unfortunately, a technique for independently fine tuning the emission efficiency and the size is still lacking; thus, only middle size nanocrystals have high emission efficiency. Interestingly, the layer thickness affects the nucleation and growth kinetics so changing the luminescence efficiency.

  14. Steps towards silicon optoelectronics

    CERN Document Server

    Starovoytov, A

    1999-01-01

    nanostructure fabrication. Thus, this thesis makes a dual contribution to the chosen field: it summarises the present knowledge on the possibility of utilising optical properties of nanocrystalline silicon in silicon-based electronics, and it reports new results within the framework of the subject. The main conclusion is that due to its promising optoelectronic properties nanocrystalline silicon remains a prospective competitor for the cheapest and fastest microelectronics of the next century. This thesis addresses the issue of a potential future microelectronics technology, namely the possibility of utilising the optical properties of nanocrystalline silicon for optoelectronic circuits. The subject is subdivided into three chapters. Chapter 1 is an introduction. It formulates the oncoming problem for microelectronic development, explains the basics of Integrated Optoelectronics, introduces porous silicon as a new light-emitting material and gives a brief review of other competing light-emitting material syst...

  15. Silicon germanium mask for deep silicon etching

    KAUST Repository

    Serry, Mohamed

    2014-07-29

    Polycrystalline silicon germanium (SiGe) can offer excellent etch selectivity to silicon during cryogenic deep reactive ion etching in an SF.sub.6/O.sub.2 plasma. Etch selectivity of over 800:1 (Si:SiGe) may be achieved at etch temperatures from -80 degrees Celsius to -140 degrees Celsius. High aspect ratio structures with high resolution may be patterned into Si substrates using SiGe as a hard mask layer for construction of microelectromechanical systems (MEMS) devices and semiconductor devices.

  16. 什么是SA8000

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    20世纪末期,欧洲、美国和澳大利亚都先后出现了一些关于“企业社会责任”的多边组织,并逐步形成了一些评价体系和认证制度。SA8000(SOCIAL ACCOUT ABILTY8000的英文简称)是其中最有名的标准之

  17. DAYA SAING KAKAO INDONESIA DI PASAR INTERNASIONAL

    Directory of Open Access Journals (Sweden)

    Anggita Tresliyana

    2015-07-01

    Full Text Available Cocoa is one of the major Indonesian agricultural export products. Cocoa international market has great potential regarding world’s consumption growth, therefore Indonesia is expected to take advantage on existing opportunities. The aims of this study were to analyze the competitiveness of Indonesian cocoa beans and processed cocoa trade in the international market as well as the level of competition between cocoa exporting countries. By using Revealed Comparative Advantage (RCA and Spearman Rank Correlation, it showed that Indonesia had a comparative advantage as an cocoa exporter on the international market, the highest for cocoa beans and the lowest for cocoa paste; Indonesia also had a significant correlation to exporting countries in cocoa beans’ market (Ghana and cocoa paste’s market (Netherlands and Malaysia, the correlation suggests that there were high correlation between Indonesia and the exporting country in competing for market share.Keywords: cocoa, comparative advantage, international trade, competitiveness, market share, RCA ABSTRAKKakao merupakan salah satu komoditas pertanian unggulan ekspor Indonesia.  Pasar kakao memiliki potensi yang besar dilihat dari peningkatan konsumsi dunia, sehingga Indonesia diharapkan dapat memanfaatkan peluang yang ada.  Tujuan penelitian ini adalah menganalisis daya saing perdagangan biji kakao dan kakao olahan Indonesia di pasar internasional serta hubungan daya saing antar negara eksportir kakao. Dengan menggunakan Reavealed Comparative Advantage (RCA, dan Korelasi Rank Spearman, hasil analisis menunjukkan bahwa Indonesia memiliki keunggulan komparatif sebagai eksportir biji kakao dan kakao olahan di pasar internasional, tertinggi untuk biji kakao dan terendah untuk kakao pasta;  Indonesia juga memiliki korelasi yang signifikan di beberapa negara untuk pasar biji kakao (Ghana dan kakao pasta (Belanda dan Malaysia, korelasi tersebut menunjukkan bahwa terdapat hubungan daya saing yang cukup

  18. Atmospheric environment for ASTP (SA-210) launch

    Science.gov (United States)

    Johnson, D. L.

    1976-01-01

    A summary is presented of selected atmospheric conditions observed near ASTP/SA-210 launch time on July 15, 1975, at Kennedy Space Center, Florida. Values of ambient pressure, temperature, moisture, ground winds, visual observations (cloud), density, index of refraction, and wind/wind shear aloft are included. A final meteorological data tape for the ASTP launch, consisting of wind and thermodynamic parameters versus altitude, has been constructed.

  19. IkusaSA. Integrated Assessment for Sustainability

    CSIR Research Space (South Africa)

    Scholes, RJ

    2012-10-01

    Full Text Available , have intended and unintended consequences across a range of important issues. The IkusaSA model system comprises: ? A South African national IAM nested within one or more ?state-of-the-art? global IAMs that predict trade, climate change and human.... The desired outcome is a well-functioning interface between sectors and between technical assessments and policy action. WHAT IS AN INTEGRATED ASSESSMENT MODEL (IAM)? An IAM is a numerical simulation of the dynamic interaction between socio...

  20. Transformational silicon electronics

    KAUST Repository

    Rojas, Jhonathan Prieto

    2014-02-25

    In today\\'s traditional electronics such as in computers or in mobile phones, billions of high-performance, ultra-low-power devices are neatly integrated in extremely compact areas on rigid and brittle but low-cost bulk monocrystalline silicon (100) wafers. Ninety percent of global electronics are made up of silicon. Therefore, we have developed a generic low-cost regenerative batch fabrication process to transform such wafers full of devices into thin (5 μm), mechanically flexible, optically semitransparent silicon fabric with devices, then recycling the remaining wafer to generate multiple silicon fabric with chips and devices, ensuring low-cost and optimal utilization of the whole substrate. We show monocrystalline, amorphous, and polycrystalline silicon and silicon dioxide fabric, all from low-cost bulk silicon (100) wafers with the semiconductor industry\\'s most advanced high-κ/metal gate stack based high-performance, ultra-low-power capacitors, field effect transistors, energy harvesters, and storage to emphasize the effectiveness and versatility of this process to transform traditional electronics into flexible and semitransparent ones for multipurpose applications. © 2014 American Chemical Society.

  1. Silicon applications in photonics

    Science.gov (United States)

    Jelenski, A. M.; Gawlik, G.; Wesolowski, M.

    2005-09-01

    Silicon technology enabled the miniaturization of computers and other electronic system for information storage, transmission and transformation allowing the development of the Knowledge Based Information Society. Despite the fact that silicon roadmap indicates possibilities for further improvement, already now the speed of electrons and the bandwidth of electronic circuits are not sufficient and photons are commonly utilized for signal transmission through optical fibers and purely photonic circuits promise further improvements. However materials used for these purposes II/V semiconductor compounds, glasses make integration of optoelectronic circuits with silicon complex an expensive. Therefore research on light generation, transformation and transmission in silicon is very active and recently, due to nanotechnology some spectacular results were achieved despite the fact that mechanisms of light generation are still discussed. Three topics will be discussed. Porous silicon was actively investigated due to its relatively efficient electroluminescence enabling its use in light sources. Its index of refraction, differs considerably from the index of silicon, and this allows its utilization for Bragg mirrors, wave guides and photonic crystals. The enormous surface enables several applications on medicine and biotechnology and in particular due to the effective chemo-modulation of its refracting index the design of optical chemosensors. An effective luminescence of doped and undoped nanocrystalline silicon opened another way for the construction of silicon light sources. Optical amplification was already discovered opening perspectives for the construction of nanosilicon lasers. Luminescences was observed at red, green and blue wavelengths. The used technology of silica and ion implantation are compatible with commonly used CMOS technology. Finally the recently developed and proved idea of optically pumped silicon Raman lasers, using nonlinearity and vibrations in the

  2. Roadmap on silicon photonics

    Science.gov (United States)

    Thomson, David; Zilkie, Aaron; Bowers, John E.; Komljenovic, Tin; Reed, Graham T.; Vivien, Laurent; Marris-Morini, Delphine; Cassan, Eric; Virot, Léopold; Fédéli, Jean-Marc; Hartmann, Jean-Michel; Schmid, Jens H.; Xu, Dan-Xia; Boeuf, Frédéric; O'Brien, Peter; Mashanovich, Goran Z.; Nedeljkovic, M.

    2016-07-01

    Silicon photonics research can be dated back to the 1980s. However, the previous decade has witnessed an explosive growth in the field. Silicon photonics is a disruptive technology that is poised to revolutionize a number of application areas, for example, data centers, high-performance computing and sensing. The key driving force behind silicon photonics is the ability to use CMOS-like fabrication resulting in high-volume production at low cost. This is a key enabling factor for bringing photonics to a range of technology areas where the costs of implementation using traditional photonic elements such as those used for the telecommunications industry would be prohibitive. Silicon does however have a number of shortcomings as a photonic material. In its basic form it is not an ideal material in which to produce light sources, optical modulators or photodetectors for example. A wealth of research effort from both academia and industry in recent years has fueled the demonstration of multiple solutions to these and other problems, and as time progresses new approaches are increasingly being conceived. It is clear that silicon photonics has a bright future. However, with a growing number of approaches available, what will the silicon photonic integrated circuit of the future look like? This roadmap on silicon photonics delves into the different technology and application areas of the field giving an insight into the state-of-the-art as well as current and future challenges faced by researchers worldwide. Contributions authored by experts from both industry and academia provide an overview and outlook for the silicon waveguide platform, optical sources, optical modulators, photodetectors, integration approaches, packaging, applications of silicon photonics and approaches required to satisfy applications at mid-infrared wavelengths. Advances in science and technology required to meet challenges faced by the field in each of these areas are also addressed together with

  3. Performance Evaluation Considering Iterations per Phase and SA Temperature in WMN-SA System

    Directory of Open Access Journals (Sweden)

    Shinji Sakamoto

    2014-01-01

    Full Text Available One of the key advantages of Wireless Mesh Networks (WMNs is their importance for providing cost-efficient broadband connectivity. There are issues for achieving the network connectivity and user coverage, which are related with the node placement problem. In this work, we consider Simulated Annealing Algorithm (SA temperature and Iteration per phase for the router node placement problem in WMNs. We want to find the optimal distribution of router nodes in order to provide the best network connectivity and provide the best coverage in a set of Normal distributed clients. From simulation results, we found how to optimize both the size of Giant Component and number of covered mesh clients. When the number of iterations per phase is big, the performance is better in WMN-SA System. From for SA temperature, when SA temperature is 0 and 1, the performance is almost same. When SA temperature is 2 and 3 or more, the performance decrease because there are many kick ups.

  4. Recrystallization of polycrystalline silicon

    Science.gov (United States)

    Lall, C.; Kulkarni, S. B.; Graham, C. D., Jr.; Pope, D. P.

    1981-01-01

    Optical metallography is used to investigate the recrystallization properties of polycrystalline semiconductor-grade silicon. It is found that polycrystalline silicon recrystallizes at 1380 C in relatively short times, provided that the prior deformation is greater than 30%. For a prior deformation of about 40%, the recrystallization process is essentially complete in about 30 minutes. Silicon recrystallizes at a substantially slower rate than metals at equivalent homologous temperatures. The recrystallized grain size is insensitive to the amount of prestrain for strains in the range of 10-50%.

  5. Porous silicon gettering

    Energy Technology Data Exchange (ETDEWEB)

    Tsuo, Y.S.; Menna, P.; Pitts, J.R. [National Renewable Energy Lab., Golden, CO (United States)] [and others

    1996-05-01

    The authors have studied a novel extrinsic gettering method that uses the large surface areas produced by a porous-silicon etch as gettering sites. The annealing step of the gettering used a high-flux solar furnace. They found that a high density of photons during annealing enhanced the impurity diffusion to the gettering sites. The authors used metallurgical-grade Si (MG-Si) prepared by directional solidification casing as the starting material. They propose to use porous-silicon-gettered MG-Si as a low-cost epitaxial substrate for polycrystalline silicon thin-film growth.

  6. Microstructured silicon radiation detector

    Energy Technology Data Exchange (ETDEWEB)

    Okandan, Murat; Derzon, Mark S.; Draper, Bruce L.

    2017-03-14

    A radiation detector comprises a silicon body in which are defined vertical pores filled with a converter material and situated within silicon depletion regions. One or more charge-collection electrodes are arranged to collect current generated when secondary particles enter the silicon body through walls of the pores. The pores are disposed in low-density clusters, have a majority pore thickness of 5 .mu.m or less, and have a majority aspect ratio, defined as the ratio of pore depth to pore thickness, of at least 10.

  7. Emissivity of microstructured silicon.

    Science.gov (United States)

    Maloney, Patrick G; Smith, Peter; King, Vernon; Billman, Curtis; Winkler, Mark; Mazur, Eric

    2010-03-01

    Infrared transmittance and hemispherical-directional reflectance data from 2.5 to 25 microm on microstructured silicon surfaces have been measured, and spectral emissivity has been calculated for this wavelength range. Hemispherical-total emissivity is calculated for the samples and found to be 0.84 before a measurement-induced annealing and 0.65 after the measurement for the sulfur-doped sample. Secondary samples lack a measurement-induced anneal, and reasons for this discrepancy are presented. Emissivity numbers are plotted and compared with a silicon substrate, and Aeroglaze Z306 black paint. Use of microstructured silicon as a blackbody or microbolometer surface is modeled and presented, respectively.

  8. Silicon nanowire hybrid photovoltaics

    KAUST Repository

    Garnett, Erik C.

    2010-06-01

    Silicon nanowire Schottky junction solar cells have been fabricated using n-type silicon nanowire arrays and a spin-coated conductive polymer (PEDOT). The polymer Schottky junction cells show superior surface passivation and open-circuit voltages compared to standard diffused junction cells with native oxide surfaces. External quantum efficiencies up to 88% were measured for these silicon nanowire/PEDOT solar cells further demonstrating excellent surface passivation. This process avoids high temperature processes which allows for low-cost substrates to be used. © 2010 IEEE.

  9. Effects of Antifungal Soaked Silicone Hydrogel Contact Lenses on Candida albicans in an Agar Eye Model.

    Science.gov (United States)

    Phan, Chau-Minh; Bajgrowicz, Magdalena; McCanna, David J; Subbaraman, Lakshman N; Jones, Lyndon

    2016-09-01

    To evaluate the effects of two commercial silicone hydrogel contact lenses (CLs) soaked with natamycin (NA) or fluconazole (FL) on the growth of Candida albicans in an in vitro eye model. Three-D printed molds were used as a cast for making eye-shaped models comprising potato dextrose agar. Senofilcon A (SA) and lotrafilcon B (LB) CLs were incubated with either 2 mL of NA or FL at a concentration of 1 mg/mL for 24 hr. To simulate a fungal infection, the eye models were coated with C. albicans. The drug-soaked lenses were placed on top of the eye models. Seven experimental conditions were examined: (1) NA-SA, (2) NA-LB, (3) FL-SA, (4) FL-LB, (5) SA, (6) LB, and (7) control-no lens. At specified time points (t=1, 8, 16, 24, 48 hr), the agar eyes from each experimental condition were removed from the incubator and photographed. The yeast cells from the 24 and 48 hr time point were also analyzed using light microscopy. At 24 and 48 hr, there was considerable growth observed for all conditions except for the NA-SA and NA-LB conditions. When observed under the microscope at 24 and 48 hr, the morphology of the yeast cells in the FL-SA and SA condition were similar to that of the control (oval shaped). There was limited hyphae growth observed for LB and significant visible hyphae growth for the NA-LB group. For NA-SA, NA-LB, and FL-LB groups, the cells were significantly smaller compared with the control. For NA-SA and NA-LB, there was limited growth of C. albicans observed on the eye models even after 48 hr. Under the microscope, the cell morphology differ noticeably between each testing condition, and is dependent on drug-lens combinations.

  10. Integrated silicon optoelectronics

    CERN Document Server

    Zimmermann, Horst

    2000-01-01

    'Integrated Silicon Optoelectronics'assembles optoelectronics and microelectronics The book concentrates on silicon as the major basis of modern semiconductor devices and circuits Starting from the basics of optical emission and absorption and from the device physics of photodetectors, the aspects of the integration of photodetectors in modern bipolar, CMOS, and BiCMOS technologies are discussed Detailed descriptions of fabrication technologies and applications of optoelectronic integrated circuits are included The book, furthermore, contains a review of the state of research on eagerly expected silicon light emitters In order to cover the topic of the book comprehensively, integrated waveguides, gratings, and optoelectronic power devices are included in addition Numerous elaborate illustrations promote an easy comprehension 'Integrated Silicon Optoelectronics'will be of value to engineers, physicists, and scientists in industry and at universities The book is also recommendable for graduate students speciali...

  11. Silicon microfabricated beam expander

    Science.gov (United States)

    Othman, A.; Ibrahim, M. N.; Hamzah, I. H.; Sulaiman, A. A.; Ain, M. F.

    2015-03-01

    The feasibility design and development methods of silicon microfabricated beam expander are described. Silicon bulk micromachining fabrication technology is used in producing features of the structure. A high-precision complex 3-D shape of the expander can be formed by exploiting the predictable anisotropic wet etching characteristics of single-crystal silicon in aqueous Potassium-Hydroxide (KOH) solution. The beam-expander consist of two elements, a micromachined silicon reflector chamber and micro-Fresnel zone plate. The micro-Fresnel element is patterned using lithographic methods. The reflector chamber element has a depth of 40 µm, a diameter of 15 mm and gold-coated surfaces. The impact on the depth, diameter of the chamber and absorption for improved performance are discussed.

  12. Silicon microfabricated beam expander

    Energy Technology Data Exchange (ETDEWEB)

    Othman, A., E-mail: aliman@ppinang.uitm.edu.my; Ibrahim, M. N.; Hamzah, I. H.; Sulaiman, A. A. [Faculty of Electrical Engineering, Universiti Teknologi MARA Malaysia, 40450, Shah Alam, Selangor (Malaysia); Ain, M. F. [School of Electrical and Electronic Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300,Nibong Tebal, Pulau Pinang (Malaysia)

    2015-03-30

    The feasibility design and development methods of silicon microfabricated beam expander are described. Silicon bulk micromachining fabrication technology is used in producing features of the structure. A high-precision complex 3-D shape of the expander can be formed by exploiting the predictable anisotropic wet etching characteristics of single-crystal silicon in aqueous Potassium-Hydroxide (KOH) solution. The beam-expander consist of two elements, a micromachined silicon reflector chamber and micro-Fresnel zone plate. The micro-Fresnel element is patterned using lithographic methods. The reflector chamber element has a depth of 40 µm, a diameter of 15 mm and gold-coated surfaces. The impact on the depth, diameter of the chamber and absorption for improved performance are discussed.

  13. Neuromorphic Silicon Photonics

    CERN Document Server

    Tait, Alexander N; de Lima, Thomas Ferreira; Wu, Allie X; Nahmias, Mitchell A; Shastri, Bhavin J; Prucnal, Paul R

    2016-01-01

    We report first observations of an integrated analog photonic network, in which connections are configured by microring weight banks, as well as the first use of electro-optic modulators as photonic neurons. A mathematical isomorphism between the silicon photonic circuit and a continuous neural model is demonstrated through dynamical bifurcation analysis. Exploiting this isomorphism, existing neural engineering tools can be adapted to silicon photonic information processing systems. A 49-node silicon photonic neural network programmed using a "neural compiler" is simulated and predicted to outperform a conventional approach 1,960-fold in a toy differential system emulation task. Photonic neural networks leveraging silicon photonic platforms could access new regimes of ultrafast information processing for radio, control, and scientific computing.

  14. The DELPHI silicon tracker

    CERN Document Server

    Pernegger, H

    1997-01-01

    The DELPHI collaboration has upgraded the Silicon Vertex Detector in order to cope with the physics requirements for LEP200. The new detector consists of a barrel section with three layers of microstrip detectors and a forward extension made of hybrid pixel and large pitch strip detectors. The layout of the detector and the techniques used for the different parts of the new silicon detector shall be described.

  15. DAYA SAING TEH INDONESIA DI PASAR INTERNASIONAL

    Directory of Open Access Journals (Sweden)

    Fadhilah Ramadhani

    2013-11-01

    Full Text Available Abstrak ___________________________________________________________________ Teh merupakan komoditas sub sektor perkebunan yang pernah mengalami kejayaan selama dua puluh tahun terakhir. Namun dari tahun ke tahun peringkat teh Indonesia di pasar internasional terus mengalami penurunan. Penurunan tersebut dari peringkat ke dua dunia menjadi peringkat ke enam dunia. Hal ini diduga karena lemahnya daya saing produk teh Indonesia di pasar internasional. Adapun tujuan penelitian ini untuk mengkaji perkembangan daya saing teh Indonesia di pasar internasional serta faktor yang mempengaruhi posisi daya saing tesebut. Metode analisis data yang digunakan dalam penelitian ini adalah analisis deskriptif untuk hasil uji Import Dependency Ratio (IDR, Self Sufficiency Ratio (SSR, dan  Revealed Comparative Advantage (RCA. Selanjutnya hasil nilai Revealed Comparative Advantage (RCA akan diregresi dengan metode Ordinary Least Square (OLS.  Berdasarkan hasil uji Import Dependency Ratio (IDR mendapatkan nilai 0 persen hingga 16 persen yang menunjukkan Indonesia tidak mempunyai ketergantungan terhadap produk impor teh. Sedangkan nilai Self Sufficiency Ratio (SSR menunjukkan nilai 280,015 persen, artinya produksi teh Indonesia cukup untuk memenuhi kebutuhan dalam negeri dan ekspor. Dengan nilai daya saing yang cukup kuat, dilihat dari nilai Revealed Comparative Advantage (RCA sebesar 6,790. Hasil uji regresi Ordinary Least Square (OLS terdahap Revealed Comparative Advantage (RCA, menunjukkan kurs rill dan harga riil berpengaruh secara signifikan terhadap posisi daya saing teh indonesia di pasar internasional pada α = 5%. Produksi teh Indonesia tidak berpengaruh terhadap posisi daya saing dengan α = 5%. Abstract ______________________________________________________________ Tea is plantation commodity has been experienced triumph over the last twenty years. But every years ratings Indonesia tea in international markets continues to decline. The decline Indonesia

  16. Manufacturing of JT-60SA Cryostat Base

    Energy Technology Data Exchange (ETDEWEB)

    Medrano, Mercedes, E-mail: mercedes.medrano@ciemat.es [Association EURATOM – CIEMAT, Avda. Complutense 40, 28040 Madrid (Spain); Alonso, Javier; Botija, José; Fernández, Pilar; Ramos, Francisco; Rincon, Esther; Soleto, Alfonso [Association EURATOM – CIEMAT, Avda. Complutense 40, 28040 Madrid (Spain); Davis, Sam; Di Pietro, Enrico [Fusion for Energy, JT-60SA European Home Team, 85748 Garching bei Munchen (Germany); Masaki, Kei; Sakasai, Akira [JAEA, Japan Atomic Energy Agency, Naka Fusion Institute, Ibaraki 311-0193 (Japan)

    2013-10-15

    Highlights: ► JT-60SA Cryostat Base has been fabricated in seven structures fastened by bolts. ► The pieces are fully welded structures further machined to get required tolerances. ► The pre-assembly of the Cryostat Base will be done at the factory to check final tolerances as well as to anticipate problems which could be encountered during final assembly. -- Abstract: JT-60SA is a superconducting tokamak to be assembled and operated at the JAEA laboratories in Naka (Japan) [1]. The tokamak has been designed to prepare, support and complement the ITER experimental programme and will be manufactured and operated under the funding of the Broader Approach Agreement (between the government of Japan and the European Commission) and of the Japan Fusion National Programme. Within the European contribution to JT-60SA, Spain has to provide the cryostat. Due to functional purposes, the cryostat has been divided in two large assemblies: the Cryostat Base (CB) and the Cryostat Vessel Body the latter subdivided into Cryostat Vessel Body Cylindrical Section (CVBCS) and the Top Lid. Spain is committed to provide the design and subsequent manufacturing of the CB and CVBCS (excluding the Top Lid) through the National Laboratory of Fusion at Ciemat. The design of both components has been concluded and the CB is currently being manufactured by a Spanish company, IDESA. This paper aims to present the status of the manufacturing and pre-assembly at the factory of the CB that has to be delivered in November 2012.

  17. Oxygen defect processes in silicon and silicon germanium

    KAUST Repository

    Chroneos, A.

    2015-06-18

    Silicon and silicon germanium are the archetypical elemental and alloy semiconductor materials for nanoelectronic, sensor, and photovoltaic applications. The investigation of radiation induced defects involving oxygen, carbon, and intrinsic defects is important for the improvement of devices as these defects can have a deleterious impact on the properties of silicon and silicon germanium. In the present review, we mainly focus on oxygen-related defects and the impact of isovalent doping on their properties in silicon and silicon germanium. The efficacy of the isovalent doping strategies to constrain the oxygen-related defects is discussed in view of recent infrared spectroscopy and density functional theory studies.

  18. Silicon-Based Light Sources for Silicon Integrated Circuits

    Directory of Open Access Journals (Sweden)

    L. Pavesi

    2008-01-01

    Full Text Available Silicon the material per excellence for electronics is not used for sourcing light due to the lack of efficient light emitters and lasers. In this review, after having introduced the basics on lasing, I will discuss the physical reasons why silicon is not a laser material and the approaches to make it lasing. I will start with bulk silicon, then I will discuss silicon nanocrystals and Er3+ coupled silicon nanocrystals where significant advances have been done in the past and can be expected in the near future. I will conclude with an optimistic note on silicon lasing.

  19. Oxygen defect processes in silicon and silicon germanium

    Energy Technology Data Exchange (ETDEWEB)

    Chroneos, A., E-mail: alexander.chroneos@imperial.ac.uk [Faculty of Engineering and Computing, Coventry University, Priory Street, Coventry CV1 5FB (United Kingdom); Department of Materials, Imperial College London, London SW7 2BP (United Kingdom); Sgourou, E. N.; Londos, C. A. [Solid State Section, Physics Department, University of Athens, Panepistimiopolis, Zografos, 157 84 Athens (Greece); Schwingenschlögl, U. [PSE Division, KAUST, Thuwal 23955-6900 (Saudi Arabia)

    2015-06-15

    Silicon and silicon germanium are the archetypical elemental and alloy semiconductor materials for nanoelectronic, sensor, and photovoltaic applications. The investigation of radiation induced defects involving oxygen, carbon, and intrinsic defects is important for the improvement of devices as these defects can have a deleterious impact on the properties of silicon and silicon germanium. In the present review, we mainly focus on oxygen-related defects and the impact of isovalent doping on their properties in silicon and silicon germanium. The efficacy of the isovalent doping strategies to constrain the oxygen-related defects is discussed in view of recent infrared spectroscopy and density functional theory studies.

  20. Amorphous silicon crystalline silicon heterojunction solar cells

    CERN Document Server

    Fahrner, Wolfgang Rainer

    2013-01-01

    Amorphous Silicon/Crystalline Silicon Solar Cells deals with some typical properties of heterojunction solar cells, such as their history, the properties and the challenges of the cells, some important measurement tools, some simulation programs and a brief survey of the state of the art, aiming to provide an initial framework in this field and serve as a ready reference for all those interested in the subject. This book helps to "fill in the blanks" on heterojunction solar cells. Readers will receive a comprehensive overview of the principles, structures, processing techniques and the current developmental states of the devices. Prof. Dr. Wolfgang R. Fahrner is a professor at the University of Hagen, Germany and Nanchang University, China.

  1. AGREEMENT BETWEEN CERN AND UBS SA

    CERN Multimedia

    2002-01-01

    We wish to inform you that the agreement between CERN and UBS SA has been renewed for a period of five years with effect from 1st July 2002. This represents the culmination of work carried out since 1999 by a group consisting of representatives of the Finance Division, the SPL Division, the Staff Association and the Users Office. After analysis of the results of a market survey, it emerged that OVERALL the UBS offered the best conditions and guarantees for the CERN personnel. Owing to developments in the banking market, new conditions have had to be negotiated, which will be presented to you by the UBS (see article).

  2. Adhesion of Silicone Elastomer Seals for NASA's Crew Exploration Vehicle

    Science.gov (United States)

    deGroh, Henry C., III; Miller, Sharon K. R.; Smith, Ian M.; Daniels, Christopher C.; Steinetz, Bruce M

    2008-01-01

    Silicone rubber seals are being considered for a number of interfaces on NASA's Crew Exploration Vehicle (CEV). Some of these joints include the docking system, hatches, and heat shield-to-back shell interface. A large diameter molded silicone seal is being developed for the Low Impact Docking System (LIDS) that forms an effective seal between the CEV and International Space Station (ISS) and other future Constellation Program spacecraft. Seals between the heat shield and back shell prevent high temperature reentry gases from leaking into the interface. Silicone rubber seals being considered for these locations have inherent adhesive tendencies that would result in excessive forces required to separate the joints if left unchecked. This paper summarizes adhesion assessments for both as-received and adhesion-mitigated seals for the docking system and the heat shield interface location. Three silicone elastomers were examined: Parker Hannifin S0899-50 and S0383-70 compounds, and Esterline ELA-SA-401 compound. For the docking system application various levels of exposure to atomic oxygen (AO) were evaluated. Moderate AO treatments did not lower the adhesive properties of S0899-50 sufficiently. However, AO pretreatments of approximately 10(exp 20) atoms/sq cm did lower the adhesion of S0383-70 and ELA-SA-401 to acceptable levels. For the heat shield-to-back shell interface application, a fabric covering was also considered. Molding Nomex fabric into the heat shield pressure seal appreciably reduced seal adhesion for the heat shield-to-back shell interface application.

  3. An investigation on SA 213-Tube to SA 387-Tube plate using friction welding process

    Energy Technology Data Exchange (ETDEWEB)

    Rajan, S. Pandia; Kumaraswamidhas, L. A. [Indian Institute of Technology, Jharkhand (India); Kumaran, S. Senthil [RVS School of Engineering and Technology, Tamil Nadu (India); Muthukumaran, S. [National Institute of Technology, Tamil Nadu (India)

    2016-01-15

    Friction welding of tube to tube plate using an external tool (FWTPET) is a relatively newer solid state welding process used for joining tube to tube plate of either similar or dissimilar materials with enhanced mechanical and metallurgical properties. In the present study, FWTPET has been used to weld SA 213 (Grade T12) tube with SA 387 (Grade 22) tube plate. The welded samples are found to have satisfactory joint strength and the Energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) study showed that inter metallic compound is absent in the weld zone. The different weld joints have been identified and the phase composition is found using EDX and XRD. Microstructures have been analyzed using optical and Scanning electron microscopy (SEM). The mechanical properties such as hardness, compressive shear strength and peel test for different weld conditions are studied and the hardness survey revealed that there is increase in hardness at the weld interface due to grain refinement. The corrosion behavior for different weld conditions have been analyzed and the weld zone is found to have better corrosion resistance due to the influence of the grain refinement after FWTPET welding process. Hence, the present investigation is carried out to study the behavior of friction welded dissimilar joints of SA 213 tube and SA 387 tube plate joints and the results are presented. The present study confirms that a high quality tube to tube plate joint can be achieved using FWTPET process at 1120 rpm.

  4. Perfil de saúde dos trabalhadores de um Centro de Saúde-Escola

    Directory of Open Access Journals (Sweden)

    Nascimento Lucila Castanheira

    2002-01-01

    Full Text Available O estudo buscou descrever o perfil de saúde dos trabalhadores (184 de um Centro de Saúde-Escola de Ribeirão Preto, sob a perspectiva da Promoção de Saúde, modelo epidemiológico de Blum e fatores de risco para doenças crônico-degenerativas. Foi realizado estudo descritivo utilizando-se entrevista estruturada. Concluiu-se que os trabalhadores eram predominantemente do sexo feminino, faixa etária de 35 a 39 anos e escolaridade "superior completo". Dentre os achados, constatou-se que 61,9% tinham sobrepeso e obesidade; a hipertensão foi detectada em 33,1%; 41 (22,3% apresentaram pressão arterial acima do nível da normalidade e a obesidade mostrou-se presente em mais da metade dos indivíduos com pressão arterial alterada. Os dados possibilitaram explorar riscos autocriados para as doenças crônico-degenerativas; identificar fatores relacionados à promoção de saúde e prevenção de doenças e refletir sobre o autocuidado e auto-responsabilidade, visando à qualidade de vida que desfrutarão, em decorrência da transição demográfica e epidemiológica que vivenciamos.

  5. North America and South America (NA-SA) neuropathy project.

    Science.gov (United States)

    Pasnoor, Mamatha; Nascimento, Osvaldo J M; Trivedi, Jaya; Wolfe, Gil I; Nations, Sharon; Herbelin, Laura; de Freitas, M G; Quintanilha, Giseli; Khan, Saud; Dimachkie, Mazen; Barohn, Richard

    2013-08-01

    Peripheral neuropathy is a common neurological disorder. There may be important differences and similarities in the diagnosis of peripheral neuropathy between North America (NA) and South America (SA). Neuromuscular databases were searched for neuropathy diagnosis at two North American sites, University of Kansas Medical Center and University of Texas Southwestern Medical Center, and one South American site, Federal Fluminense University in Brazil. All patients were included into one of the six major categories: immune-mediated, diabetic, hereditary, infectious/inflammatory, systemic/metabolic/toxic (not diabetic) and cryptogenic. A comparison of the number of patients in each category was made between North America and South America databases. Total number of cases in North America was 1090 and in South America was 1034 [immune-mediated: NA 215 (19.7%), SA 191 (18%); diabetic: NA 148 (13.5%), SA 236 (23%); hereditary: NA 292 (26.7%), SA 103 (10%); infectious/inflammatory: NA 53 (4.8%), SA 141 (14%); systemic/metabolic/toxic: NA 71 (6.5%), SA 124 (12%); cryptogenic: NA 311 (28.5%), SA 239 (23%)]. Some specific neuropathy comparisons were hereditary neuropathies [Charcot-Marie-Tooth (CMT) cases] in NA 246/292 (84.2%) and SA 60/103 (58%); familial amyloid neuropathy in SA 31/103 (30%) and none in NA. Among infectious neuropathies, cases of human T-lymphotropic virus type 1 (HTLV-1) neuropathy in SA were 36/141(25%), Chagas disease in SA were 13/141(9%) and none for either in NA; cases of neuropathy due to leprosy in NA were 26/53 (49%) and in SA were 39/141(28%). South American tertiary care centers are more likely to see patients with infectious, diabetic and hereditary disorders such as familial amyloid neuropathies. North American tertiary centers are more likely to see patients with CMT. Immune neuropathies and cryptogenic neuropathies were seen equally in North America and South America.

  6. Bond Angles in the Crystalline Silicon/Silicon Nitride Interface

    Science.gov (United States)

    Leonard, Robert H.; Bachlechner, Martina E.

    2006-03-01

    Silicon nitride deposited on a silicon substrate has major applications in both dielectric layers in microelectronics and as antireflection and passivation coatings in photovoltaic applications. Molecular dynamic simulations are performed to investigate the influence of temperature and rate of externally applied strain on the structural and mechanical properties of the silicon/silicon nitride interface. Bond-angles between various atom types in the system are used to find and understand more about the mechanisms leading to the failure of the crystal. Ideally in crystalline silicon nitride, bond angles of 109.5 occur when a silicon atom is at the vertex and 120 angles occur when a nitrogen atom is at the vertex. The comparison of the calculated angles to the ideal values give information on the mechanisms of failure in silicon/silicon nitride system.

  7. Effect of succinic anhydride as an electrolyte additive on electrochemical characteristics of silicon thin-film electrode

    Science.gov (United States)

    Han, Gi-Beom; Ryou, Myung-Hyun; Cho, Kuk Young; Lee, Yong Min; Park, Jung-Ki

    The effect of an electrolyte additive, succinic anhydride (SA), on the electrochemical performances of a silicon thin-film electrode, which is prepared by radio-frequency magnetron sputtering, is investigated. The introduction of SA into a liquid electrolyte consisting of ethylene carbonate/diethyl carbonate/1 M LiPF 6 significantly enhances the capacity retention and coulombic efficiency of the electrode. This improvement in the electrochemical performance of the electrode is attributed to modification of the solid/electrolyte interphase (SEI) layer by the introduction of SA. The differences in the characteristic properties of SEI layers, with or without SA, are explained by analysis with scanning electron microscopy, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy.

  8. Saúde Coletiva: um desafio para a enfermagem

    Directory of Open Access Journals (Sweden)

    Matumoto Silvia

    2001-01-01

    Full Text Available O texto parte da saúde pública para discutir o que é saúde coletiva, seu objeto e campo de atuação, dando ênfase à concepção de homem, à discussão a respeito do âmbito individual e coletivo e ao conceito de saúde-doença, passando pelo debate da construção interdisciplinar da saúde coletiva. Em seguida, busca situar a enfermagem nesse campo, destacando aquilo que parece ser um grande desafio, compreender a enfermagem como prática de relações.

  9. Performance improvement of silicon solar cells by nanoporous silicon coating

    Directory of Open Access Journals (Sweden)

    Dzhafarov T. D.

    2012-04-01

    Full Text Available In the present paper the method is shown to improve the photovoltaic parameters of screen-printed silicon solar cells by nanoporous silicon film formation on the frontal surface of the cell using the electrochemical etching. The possible mechanisms responsible for observed improvement of silicon solar cell performance are discussed.

  10. Spintronics: Silicon takes a spin

    NARCIS (Netherlands)

    Jansen, Ron

    2007-01-01

    An efficient way to transport electron spins from a ferromagnet into silicon essentially makes silicon magnetic, and provides an exciting step towards integration of magnetism and mainstream semiconductor electronics.

  11. Thick silicon growth techniques

    Science.gov (United States)

    Bates, H. E.; Mlavsky, A. I.; Jewett, D. N.

    1973-01-01

    Hall mobility measurements on a number of single crystal silicon ribbons grown from graphite dies have shown some ribbons to have mobilities consistent with their resistivities. The behavior of other ribbons appears to be explained by the introduction of impurities of the opposite sign. Growth of a small single crystal silicon ribbon has been achieved from a beryllia dia. Residual internal stresses of the order of 7 to 18,000 psi have been determined to exist in some silicon ribbon, particularly those grown at rates in excess of 1 in./min. Growth experiments have continued toward definition of a configuration and parameters to provide a reasonable yield of single crystal ribbons. High vacuum outgassing of graphite dies and evacuation and backfilling of growth chambers have provided significant improvements in surface quality of ribbons grown from graphite dies.

  12. The electrophotonic silicon biosensor

    Science.gov (United States)

    Juan-Colás, José; Parkin, Alison; Dunn, Katherine E.; Scullion, Mark G.; Krauss, Thomas F.; Johnson, Steven D.

    2016-09-01

    The emergence of personalized and stratified medicine requires label-free, low-cost diagnostic technology capable of monitoring multiple disease biomarkers in parallel. Silicon photonic biosensors combine high-sensitivity analysis with scalable, low-cost manufacturing, but they tend to measure only a single biomarker and provide no information about their (bio)chemical activity. Here we introduce an electrochemical silicon photonic sensor capable of highly sensitive and multiparameter profiling of biomarkers. Our electrophotonic technology consists of microring resonators optimally n-doped to support high Q resonances alongside electrochemical processes in situ. The inclusion of electrochemical control enables site-selective immobilization of different biomolecules on individual microrings within a sensor array. The combination of photonic and electrochemical characterization also provides additional quantitative information and unique insight into chemical reactivity that is unavailable with photonic detection alone. By exploiting both the photonic and the electrical properties of silicon, the sensor opens new modalities for sensing on the microscale.

  13. Floating Silicon Method

    Energy Technology Data Exchange (ETDEWEB)

    Kellerman, Peter

    2013-12-21

    The Floating Silicon Method (FSM) project at Applied Materials (formerly Varian Semiconductor Equipment Associates), has been funded, in part, by the DOE under a “Photovoltaic Supply Chain and Cross Cutting Technologies” grant (number DE-EE0000595) for the past four years. The original intent of the project was to develop the FSM process from concept to a commercially viable tool. This new manufacturing equipment would support the photovoltaic industry in following ways: eliminate kerf losses and the consumable costs associated with wafer sawing, allow optimal photovoltaic efficiency by producing high-quality silicon sheets, reduce the cost of assembling photovoltaic modules by creating large-area silicon cells which are free of micro-cracks, and would be a drop-in replacement in existing high efficiency cell production process thereby allowing rapid fan-out into the industry.

  14. Silicon containing copolymers

    CERN Document Server

    Amiri, Sahar; Amiri, Sanam

    2014-01-01

    Silicones have unique properties including thermal oxidative stability, low temperature flow, high compressibility, low surface tension, hydrophobicity and electric properties. These special properties have encouraged the exploration of alternative synthetic routes of well defined controlled microstructures of silicone copolymers, the subject of this Springer Brief. The authors explore the synthesis and characterization of notable block copolymers. Recent advances in controlled radical polymerization techniques leading to the facile synthesis of well-defined silicon based thermo reversible block copolymers?are described along with atom transfer radical polymerization (ATRP), a technique utilized to develop well-defined functional thermo reversible block copolymers. The brief also focuses on Polyrotaxanes and their great potential as stimulus-responsive materials which produce poly (dimethyl siloxane) (PDMS) based thermo reversible block copolymers.

  15. Silicon photonics: optical modulators

    Science.gov (United States)

    Reed, G. T.; Gardes, F. Y.; Hu, Youfang; Thomson, D.; Lever, L.; Kelsall, R.; Ikonic, Z.

    2010-01-01

    Silicon Photonics has the potential to revolutionise a whole raft of application areas. Currently, the main focus is on various forms of optical interconnects as this is a near term bottleneck for the computing industry, and hence a number of companies have also released products onto the market place. The adoption of silicon photonics for mass production will significantly benefit a range of other application areas. One of the key components that will enable silicon photonics to flourish in all of the potential application areas is a high performance optical modulator. An overview is given of the major Si photonics modulator research that has been pursued at the University of Surrey to date as well as a worldwide state of the art showing the trend and technology available. We will show the trend taken toward integration of optical and electronic components with the difficulties that are inherent in such a technology.

  16. Integrated Silicon Optoelectronics

    CERN Document Server

    Zimmermann, Horst K

    2010-01-01

    Integrated Silicon Optoelectronics synthesizes topics from optoelectronics and microelectronics. The book concentrates on silicon as the major base of modern semiconductor devices and circuits. Starting from the basics of optical emission and absorption, as well as from the device physics of photodetectors, the aspects of the integration of photodetectors in modern bipolar, CMOS, and BiCMOS technologies are discussed. Detailed descriptions of fabrication technologies and applications of optoelectronic integrated circuits are included. The book, furthermore, contains a review of the newest state of research on eagerly anticipated silicon light emitters. In order to cover the topics comprehensively, also included are integrated waveguides, gratings, and optoelectronic power devices. Numerous elaborate illustrations facilitate and enhance comprehension. This extended edition will be of value to engineers, physicists, and scientists in industry and at universities. The book is also recommended to graduate student...

  17. Microgravity silicon zoning investigation

    Science.gov (United States)

    Kern, E. L.; Gill, G. L., Jr.

    1985-01-01

    The flow instabilities in floating zones of silicon were investigated and methods for investigation of these instabilities in microgravity were defined. Three principal tasks were involved: (1) characterization of the float zone in small diameter rods; (2) investigation of melt flow instabilities in circular melts in silicon disks; and (3) the development of a prototype of an apparatus that could be used in near term space experiments to investigate flow instabilities in a molten zone. It is shown that in a resistance heated zoner with 4 to 7 mm diameter silicon rods that the critical Marangoni number is about 1480 compared to a predicted value of 14 indicative that viable space experiments might be performed. The prototype float zone apparatus is built and specifications are prepared for a flight zoner should a decision be reached to proceed with a space flight experimental investigation.

  18. The LHCb Silicon Tracker

    Energy Technology Data Exchange (ETDEWEB)

    Tobin, Mark, E-mail: Mark.Tobin@epfl.ch

    2016-09-21

    The LHCb experiment is dedicated to the study of heavy flavour physics at the Large Hadron Collider (LHC). The primary goal of the experiment is to search for indirect evidence of new physics via measurements of CP violation and rare decays of beauty and charm hadrons. The LHCb detector has a large-area silicon micro-strip detector located upstream of a dipole magnet, and three tracking stations with silicon micro-strip detectors in the innermost region downstream of the magnet. These two sub-detectors form the LHCb Silicon Tracker (ST). This paper gives an overview of the performance and operation of the ST during LHC Run 1. Measurements of the observed radiation damage are shown and compared to the expectation from simulation.

  19. Neuromorphic silicon neuron circuits

    Directory of Open Access Journals (Sweden)

    Giacomo eIndiveri

    2011-05-01

    Full Text Available Hardware implementations of spiking neurons can be extremely useful for a large variety of applications, ranging from high-speed modeling of large-scale neural systems to real-time behaving systems, to bidirectional brain-machine interfaces. The specific circuit solutions used to implement silicon neurons depend on the application requirements. In this paper we describe the most common building blocks and techniques used to implement these circuits, and present an overview of a wide range of neuromorphic silicon neurons, which implement different computational models, ranging from biophysically realistic and conductance based Hodgkin-Huxley models to bi-dimensional generalized adaptive Integrate and Fire models. We compare the different design methodologies used for each silicon neuron design described, and demonstrate their features with experimental results, measured from a wide range of fabricated VLSI chips.

  20. The electrophotonic silicon biosensor

    Science.gov (United States)

    Juan-Colás, José; Parkin, Alison; Dunn, Katherine E.; Scullion, Mark G.; Krauss, Thomas F.; Johnson, Steven D.

    2016-01-01

    The emergence of personalized and stratified medicine requires label-free, low-cost diagnostic technology capable of monitoring multiple disease biomarkers in parallel. Silicon photonic biosensors combine high-sensitivity analysis with scalable, low-cost manufacturing, but they tend to measure only a single biomarker and provide no information about their (bio)chemical activity. Here we introduce an electrochemical silicon photonic sensor capable of highly sensitive and multiparameter profiling of biomarkers. Our electrophotonic technology consists of microring resonators optimally n-doped to support high Q resonances alongside electrochemical processes in situ. The inclusion of electrochemical control enables site-selective immobilization of different biomolecules on individual microrings within a sensor array. The combination of photonic and electrochemical characterization also provides additional quantitative information and unique insight into chemical reactivity that is unavailable with photonic detection alone. By exploiting both the photonic and the electrical properties of silicon, the sensor opens new modalities for sensing on the microscale. PMID:27624590

  1. Silicon microphones - a Danish perspective

    DEFF Research Database (Denmark)

    Bouwstra, Siebe; Storgaard-Larsen, Torben; Scheeper, Patrick

    1998-01-01

    Two application areas of microphones are discussed, those for precision measurement and those for hearing instruments. Silicon microphones are under investigation for both areas, and Danish industry plays a key role in both. The opportunities of silicon, as well as the challenges and expectations......, are discussed. For precision measurement the challenge for silicon is large, while for hearing instruments silicon seems to be very promising....

  2. Biodiversidade, biotecnologia e saúde

    Directory of Open Access Journals (Sweden)

    Garcia Eloi S.

    1995-01-01

    Full Text Available Este artigo apresenta a importância da biodiversidade, da biotecnologia a da saúde e discute vários aspectos dos problemas biológicos, ambientais e o dilema ético, relacionados com a expansão e a exploração dos recursos naturais em razão das quais espécies de plantas e animais têm sido extintas. Por outro lado, o conhecimento da biodiversidade tem possibilitado a identificação e a utilização de novos recursos naturais para a melhoria da vida do homem neste planeta. É importante que nossos pesquisadores se envolvam na luta pela preservação do ecossistema tropical. Os programas de exploração da biodiversidade devem estar baseados em sólidos conhecimentos científicos e favorecer ecológica e economicamente a sociedade.

  3. Biodiversidade, biotecnologia e saúde

    Directory of Open Access Journals (Sweden)

    Eloi S. Garcia

    1995-09-01

    Full Text Available Este artigo apresenta a importância da biodiversidade, da biotecnologia a da saúde e discute vários aspectos dos problemas biológicos, ambientais e o dilema ético, relacionados com a expansão e a exploração dos recursos naturais em razão das quais espécies de plantas e animais têm sido extintas. Por outro lado, o conhecimento da biodiversidade tem possibilitado a identificação e a utilização de novos recursos naturais para a melhoria da vida do homem neste planeta. É importante que nossos pesquisadores se envolvam na luta pela preservação do ecossistema tropical. Os programas de exploração da biodiversidade devem estar baseados em sólidos conhecimentos científicos e favorecer ecológica e economicamente a sociedade.

  4. Novas Tecnologias e Saúde

    OpenAIRE

    2013-01-01

    Introdução Comecemos por algo simples: lidar e combater doenças sempre pressupõe alguma forma de domínio técnico, mesmo quando as práticas para obtenção da saúde estão culturalmente associadas a meios mágicos. Um aspecto importante da magia, seu sentido ritualístico estrito, a observância de fórmulas rigorosas, constitui uma forma de racionalização da experiência empírica, que resulta em conhecimento sobre propriedades alucinógenas ou curativas de certos vegetais, por exemplo. A esse resp...

  5. The Silicon Cube detector

    Energy Technology Data Exchange (ETDEWEB)

    Matea, I.; Adimi, N. [Centre d' Etudes Nucleaires de Bordeaux Gradignan - Universite Bordeaux 1 - UMR 5797, CNRS/IN2P3, Chemin du Solarium, BP 120, F-33175 Gradignan Cedex (France); Blank, B. [Centre d' Etudes Nucleaires de Bordeaux Gradignan - Universite Bordeaux 1 - UMR 5797, CNRS/IN2P3, Chemin du Solarium, BP 120, F-33175 Gradignan Cedex (France)], E-mail: blank@cenbg.in2p3.fr; Canchel, G.; Giovinazzo, J. [Centre d' Etudes Nucleaires de Bordeaux Gradignan - Universite Bordeaux 1 - UMR 5797, CNRS/IN2P3, Chemin du Solarium, BP 120, F-33175 Gradignan Cedex (France); Borge, M.J.G.; Dominguez-Reyes, R.; Tengblad, O. [Insto. Estructura de la Materia, CSIC, Serrano 113bis, E-28006 Madrid (Spain); Thomas, J.-C. [GANIL, CEA/DSM - CNRS/IN2P3, BP 55027, F-14076 Caen Cedex 5 (France)

    2009-08-21

    A new experimental device, the Silicon Cube detector, consisting of six double-sided silicon strip detectors placed in a compact geometry was developed at CENBG. Having a very good angular coverage and high granularity, it allows simultaneous measurements of energy and angular distributions of charged particles emitted from unbound nuclear states. In addition, large-volume Germanium detectors can be placed close to the collection point of the radioactive species to be studied. The setup is ideally suited for isotope separation on-line (ISOL)-type experiments to study multi-particle emitters and was tested during an experiment at the low-energy beam line of SPIRAL at GANIL.

  6. CMS silicon tracker developments

    Energy Technology Data Exchange (ETDEWEB)

    Civinini, C. E-mail: carlo.civinini@fi.infn.it; Albergo, S.; Angarano, M.; Azzi, P.; Babucci, E.; Bacchetta, N.; Bader, A.; Bagliesi, G.; Basti, A.; Biggeri, U.; Bilei, G.M.; Bisello, D.; Boemi, D.; Bosi, F.; Borrello, L.; Bozzi, C.; Braibant, S.; Breuker, H.; Bruzzi, M.; Buffini, A.; Busoni, S.; Candelori, A.; Caner, A.; Castaldi, R.; Castro, A.; Catacchini, E.; Checcucci, B.; Ciampolini, P.; Creanza, D.; D' Alessandro, R.; Da Rold, M.; Demaria, N.; De Palma, M.; Dell' Orso, R.; Della Marina, R.D.R.; Dutta, S.; Eklund, C.; Feld, L.; Fiore, L.; Focardi, E.; French, M.; Freudenreich, K.; Frey, A.; Fuertjes, A.; Giassi, A.; Giorgi, M.; Giraldo, A.; Glessing, B.; Gu, W.H.; Hall, G.; Hammarstrom, R.; Hebbeker, T.; Honma, A.; Hrubec, J.; Huhtinen, M.; Kaminsky, A.; Karimaki, V.; Koenig, St.; Krammer, M.; Lariccia, P.; Lenzi, M.; Loreti, M.; Luebelsmeyer, K.; Lustermann, W.; Maettig, P.; Maggi, G.; Mannelli, M.; Mantovani, G.; Marchioro, A.; Mariotti, C.; Martignon, G.; Evoy, B. Mc; Meschini, M.; Messineo, A.; Migliore, E.; My, S.; Paccagnella, A.; Palla, F.; Pandoulas, D.; Papi, A.; Parrini, G.; Passeri, D.; Pieri, M.; Piperov, S.; Potenza, R.; Radicci, V.; Raffaelli, F.; Raymond, M.; Santocchia, A.; Schmitt, B.; Selvaggi, G.; Servoli, L.; Sguazzoni, G.; Siedling, R.; Silvestris, L.; Starodumov, A.; Stavitski, I.; Stefanini, G.; Surrow, B.; Tempesta, P.; Tonelli, G.; Tricomi, A.; Tuuva, T.; Vannini, C.; Verdini, P.G.; Viertel, G.; Xie, Z.; Yahong, Li; Watts, S.; Wittmer, B

    2002-01-21

    The CMS Silicon tracker consists of 70 m{sup 2} of microstrip sensors which design will be finalized at the end of 1999 on the basis of systematic studies of device characteristics as function of the most important parameters. A fundamental constraint comes from the fact that the detector has to be operated in a very hostile radiation environment with full efficiency. We present an overview of the current results and prospects for converging on a final set of parameters for the silicon tracker sensors.

  7. CMS silicon tracker developments

    CERN Document Server

    Civinini, C; Angarano, M M; Azzi, P; Babucci, E; Bacchetta, N; Bader, A; Bagliesi, G; Basti, A; Biggeri, U; Bilei, G M; Bisello, D; Boemi, D; Bosi, F; Borrello, L; Bozzi, C; Braibant, S; Breuker, Horst; Bruzzi, Mara; Buffini, A; Busoni, S; Candelori, A; Caner, A; Castaldi, R; Castro, A; Catacchini, E; Checcucci, B; Ciampolini, P; Creanza, D; D'Alessandro, R; Da Rold, M; Demaria, N; De Palma, M; Dell'Orso, R; Della Marina, R; Dutta, S; Eklund, C; Feld, L; Fiore, L; Focardi, E; French, M; Freudenreich, Klaus; Frey, A; Fürtjes, A; Giassi, A; Giorgi, M; Giraldo, A; Glessing, B; Gu, W H; Hall, G; Hammarström, R; Hebbeker, T; Honma, A; Hrubec, Josef; Huhtinen, M; Kaminski, A; Karimäki, V; König, S; Krammer, Manfred; Lariccia, P; Lenzi, M; Loreti, M; Lübelsmeyer, K; Lustermann, W; Mättig, P; Maggi, G; Mannelli, M; Mantovani, G C; Marchioro, A; Mariotti, C; Martignon, G; McEvoy, B; Meschini, M; Messineo, A; Migliore, E; My, S; Paccagnella, A; Palla, Fabrizio; Pandoulas, D; Papi, A; Parrini, G; Passeri, D; Pieri, M; Piperov, S; Potenza, R; Radicci, V; Raffaelli, F; Raymond, M; Santocchia, A; Schmitt, B; Selvaggi, G; Servoli, L; Sguazzoni, G; Siedling, R; Silvestris, L; Starodumov, Andrei; Stavitski, I; Stefanini, G; Surrow, B; Tempesta, P; Tonelli, G; Tricomi, A; Tuuva, T; Vannini, C; Verdini, P G; Viertel, Gert M; Xie, Z; Li Ya Hong; Watts, S; Wittmer, B

    2002-01-01

    The CMS Silicon tracker consists of 70 m/sup 2/ of microstrip sensors which design will be finalized at the end of 1999 on the basis of systematic studies of device characteristics as function of the most important parameters. A fundamental constraint comes from the fact that the detector has to be operated in a very hostile radiation environment with full efficiency. We present an overview of the current results and prospects for converging on a final set of parameters for the silicon tracker sensors. (9 refs).

  8. Irradiation Defects in Silicon Crystal

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    The application of irradiation in silicon crystal is introduced.The defects caused by irradiation are reviewed and some major ways of studying defects in irradiated silicon are summarized.Furthermore the problems in the investigation of irradiated silicon are discussed as well as its properties.

  9. Saúde oral: um desafio para a equipe de saúde

    Directory of Open Access Journals (Sweden)

    Vera Lúcia de Oliveira Gomes

    2001-03-01

    Full Text Available Esta pesquisa teve como objetivo desvelar o conhecimento dos formandos dos cursos de Enfermagem e Medicina de uma Universidade do Rio Grande do Sul acerca da promoção da Saúde Oral. Participaram do estudo 58 acadêmicos, sendo 26 do Curso de Enfermagem e 32 do Curso de Medicina, estes responderam a um questionário com três perguntas semi-estruturadas. Através da triangulação constatamos que esse conhecimento entre os formandos dos referidos cursos é deficitário. Sabemos que é grande a dificuldade de acesso da população infantil carente aos gabinetes dentários, por esse motivo, acreditamos ser indispensável que os profissionais de Enfermagem e Medicina tenham conhecimentos referentes à promoção de saúde oral em crianças.

  10. Rheumatoid arthritis specific anti-Sa antibodies target citrullinated vimentin

    NARCIS (Netherlands)

    Vossenaar, E.R.; Despres, N.; Lapointe, E.; Heijden, A.G. van der; Lora, M.; Senshu, T.; Venrooij, W.J.W. van; Menard, H.A.

    2004-01-01

    Antibodies directed to the Sa antigen are highly specific for rheumatoid arthritis ( RA) and can be detected in approximately 40% of RA sera. The antigen, a doublet of protein bands of about 50 kDa, is present in placenta and in RA synovial tissue. Although it has been stated that the Sa antigen is

  11. Silicon carbide reinforced silicon carbide composite

    Science.gov (United States)

    Lau, Sai-Kwing (Inventor); Calandra, Salvatore J. (Inventor); Ohnsorg, Roger W. (Inventor)

    2001-01-01

    This invention relates to a process comprising the steps of: a) providing a fiber preform comprising a non-oxide ceramic fiber with at least one coating, the coating comprising a coating element selected from the group consisting of carbon, nitrogen, aluminum and titanium, and the fiber having a degradation temperature of between 1400.degree. C. and 1450.degree. C., b) impregnating the preform with a slurry comprising silicon carbide particles and between 0.1 wt % and 3 wt % added carbon c) providing a cover mix comprising: i) an alloy comprising a metallic infiltrant and the coating element, and ii) a resin, d) placing the cover mix on at least a portion of the surface of the porous silicon carbide body, e) heating the cover mix to a temperature between 1410.degree. C. and 1450.degree. C. to melt the alloy, and f) infiltrating the fiber preform with the melted alloy for a time period of between 15 minutes and 240 minutes, to produce a ceramic fiber reinforced ceramic composite.

  12. Pair distribution functions of silicon/silicon nitride interfaces

    Science.gov (United States)

    Cao, Deng; Bachlechner, Martina E.

    2006-03-01

    Using molecular dynamics simulations, we investigate different mechanical and structural properties of the silicon/silicon nitride interface. One way to characterize the structure as tensile strain is applied parallel to the interface is to calculate pair distribution functions for specific atom types. The pair distribution function gives the probability of finding a pair of atoms a distance r apart, relative to the probability expected for a completely random distribution at the same density. The pair distribution functions for bulk silicon nitride reflect the fracture of the silicon nitride film at about 8 % and the fact that the centerpiece of the silicon nitride film returns to its original structure after fracture. The pair distribution functions for interface silicon atoms reveal the formation of bonds for originally unbound atom pairs, which is indicative of the interstitial-vacancy defect that causes failure in silicon.

  13. Projetos PET-Saúde e Educando para a Saúde: construindo saberes e práticas

    Directory of Open Access Journals (Sweden)

    Pâmela Leites de Souza

    Full Text Available Buscando alcançar ações intersetoriais efetivas e inovadoras, o projeto Educando para a Saúde, vem envolvendo as escolas, academia e serviços de saúde locais no desafio de construir uma sólida relação entre saúde-escola. O presente relato de experiência socializa a trajetória do projeto Educando para a Saúde, uma parceria entre a Equipe de Saúde da Família (ESF de um bairro de Pelotas - RS, a comunidade docente de duas escolas do território e acadêmicos do Programa de Educação pelo Trabalho para a Saúde - PET-Saúde. O objetivo é refletir o papel da ESF e dos acadêmicos do Projeto PET-Saúde na integração saúde-educação. Os temas discutidos são relacionados à educação em sexualidade, direitos sexuais e reprodutivos com ênfase nas DSTs e métodos contraceptivos, prevenção, promoção e recuperação da saúde. A participação do acadêmico nas atividades de integração saúde-educação veio a acrescentar ideias, valores e conceitos, possibilitando a (reconstrução das relações interpessoais, promovendo a reciclagem do processo de trabalho. Pelos laços multiprofissionais e interdisciplinares, essa parceria consiste em aprendizado mútuo, cujos frutos refletem diretamente na melhoria da assistência prestada à comunidade.

  14. Gasto privado com saúde por classes de renda

    Directory of Open Access Journals (Sweden)

    KILSZTAJN SAMUEL

    2002-01-01

    Full Text Available OBJETIVO: O artigo analisa a participação do gasto privado com saúde das famílias no PIB e no total da renda familiar per capita e a distribuição do gasto privado com saúde das famílias por classes de renda. MÉTODOS: A pesquisa utilizou os microdados da Pesquisa Nacional por Amostra de Domicílios de 1998, com a divisão da população em quatro classes de renda familiar per capita e a distribuição dos gastos em planos de saúde, consultas médicas, consultas com outros profissionais de saúde, exames, medicamentos, artigos ortopédicos e aparelhos médicos, óculos e lentes, odontologia, hospitais, enfermagem domiciliar e outros gastos com saúde. RESULTADOS: Apenas 7,2% da população com renda familiar per capita até 1 salário mínimo em 1998 tinha direito a algum plano de saúde, e o gasto privado com saúde das famílias desta classe, que representava 52,5% da população, era em média de R$ 5,36 por pessoa. Para as pessoas com renda familiar per capita acima de 9 salários mínimos, os planos de saúde atingiam 83,2% da população e o gasto privado com saúde das famílias R$ 133,04. CONCLUSÕES: A implantação do Sistema Único de Saúde foi acompanhada pelo crescimento expressivo dos planos de saúde nos anos 90. Mesmo se todo o gasto público com saúde fosse destinado à população sem planos de saúde, ainda assim o gasto destas pessoas em 1998 só alcançaria R$ 352,62, ou seja, 43% do gasto com saúde das pessoas com planos, R$ 819,08.

  15. Saúde mental e trabalho: os problemas que persistem

    Directory of Open Access Journals (Sweden)

    Leny Sato

    Full Text Available Este artigo toma por objeto a Saúde Mental e Trabalho como uma subárea do campo da Saúde do Trabalhador. Parte da constatação de que os problemas de saúde mental e trabalho, já identificados em meados da década de 1980, persistem. Após retomar a taxonomia de tais problemas, busca evidenciar algumas de suas expressões atuais a partir da assistência e da vigilância em saúde do trabalhador, bem como pela perspectiva de alguns sindicatos mais atentos à questão. Para tal, toma como ponto de partida o Centro de Referência em Saúde do Trabalhador (CRST de Campinas. Por fim, pontua algumas características do trabalho no contexto atual para compreender as motivações dessa persistência.

  16. Advances in silicon nanophotonics

    DEFF Research Database (Denmark)

    Hvam, Jørn Märcher; Pu, Minhao

    has been an obstacle for a simple realization of electro-optic modulators, and its indirect band gap has prevented the realization of efficient silicon light emitting diodes and lasers. Still, significant progress has been made in the past few years. Electro-optic modulators based on the free carrier...

  17. ALICE Silicon Strip Detector

    CERN Multimedia

    Nooren, G

    2013-01-01

    The Silicon Strip Detector (SSD) constitutes the two outermost layers of the Inner Tracking System (ITS) of the ALICE Experiment. The SSD plays a crucial role in the tracking of the particles produced in the collisions connecting the tracks from the external detectors (Time Projection Chamber) to the ITS. The SSD also contributes to the particle identification through the measurement of their energy loss.

  18. On nanostructured silicon success

    DEFF Research Database (Denmark)

    Sigmund, Ole; Jensen, Jakob Søndergaard; Frandsen, Lars Hagedorn

    2016-01-01

    Recent Letters by Piggott et al. 1 and Shen et al. 2 claim the smallest ever dielectric wave length and polarization splitters. The associated News & Views article by Aydin3 states that these works “are the first experimental demonstration of on-chip, silicon photonic components based on complex...

  19. Silicon Valley's Turnaround

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2006-01-01

    @@ During Silicon Valley's dramatic economic growth fueled by the Internet boom and business investment in information technology, employment in the region's high-tech sec tor tripled between 1995 and 2000. The economic boom gave rise to many new firms,drawing em ployees into high-tech jobs from other regions and other industries.

  20. Characterization of Silicon Carbide.

    Science.gov (United States)

    The various electrical and structural measurement techniques for silicon carbide are described. The electrical measurements include conductivity, resistivity, carrier concentration, mobility, doping energy levels, and lifetime. The structural measurements include polytype determination and crystalline perfection. Both bulk and epitaxial films are included.

  1. Composition Comprising Silicon Carbide

    Science.gov (United States)

    Mehregany, Mehran (Inventor); Zorman, Christian A. (Inventor); Fu, Xiao-An (Inventor); Dunning, Jeremy L. (Inventor)

    2012-01-01

    A method of depositing a ceramic film, particularly a silicon carbide film, on a substrate is disclosed in which the residual stress, residual stress gradient, and resistivity are controlled. Also disclosed are substrates having a deposited film with these controlled properties and devices, particularly MEMS and NEMS devices, having substrates with films having these properties.

  2. ALICE Silicon Pixel Detector

    CERN Multimedia

    Manzari, V

    2013-01-01

    The Silicon Pixel Detector (SPD) forms the innermost two layers of the 6-layer barrel Inner Tracking System (ITS). The SPD plays a key role in the determination of the position of the primary collision and in the reconstruction of the secondary vertices from particle decays.

  3. OPAL Silicon Tungsten Luminometer

    CERN Multimedia

    OPAL was one of the four experiments installed at the LEP particle accelerator from 1989 - 2000. The Silicon Tungsten Luminometer was part of OPAL's calorimeter which was used to measure the energy of particles. Most particles end their journey in calorimeters. These detectors measure the energy deposited when particles are slowed down and stopped.

  4. Em busca de uma Teologia Pública da Saúde

    Directory of Open Access Journals (Sweden)

    Alex Villas Boas

    2016-03-01

    Full Text Available A proposta de uma teologia pública da saúde visa o diálogo entre antropologia teológica e antropologias médicas e da saúde de modo a ampliar a percepção da saúde, não somente como fato, mas como valor. Mesmo um Estado Laico, suas tradições religiosas possuem hermenêuticas de saúde, ao interpretar a doença e a morte com razões religiosas distintas, ora conflitantes, ora cooperativas com as ciências da saúde. Ampliar essas hermenêuticas religiosas compondo a sabedoria de vida presente nas expressões religiosas e o conhecimento científico da área de saúde visa uma cooperação para interesses de bem comum da sociedade civil, como é a questão da saúde. Para essa reflexão, a escola de Cós combina a sabedoria mítica asclepíade e a ciência jônia. Os mitos de saúde nomeados no juramento hipocrático pertencem à tradição da teologia poética grega e indica uma espécie de credo no qual a medicina hipocrática professa, no qual o médico além de profissional também possui fé na vida e exerce o ofício de sacerdote da esperança. Interessa ainda o modo como o a teologia da saúde grega foi recebida pela teologia cristã, e como ambas desconstruíram suas teodiceias. Nessa recepção há um caminho para pensar uma teologia pública da saúde. 

  5. Silicon in beer and brewing.

    Science.gov (United States)

    Casey, Troy R; Bamforth, Charles W

    2010-04-15

    It has been claimed that beer is one of the richest sources of silicon in the diet; however, little is known of the relationship between silicon content and beer style and the manner in which beer is produced. The purpose of this study was to measure silicon in a diversity of beers and ascertain the grist selection and brewing factors that impact the level of silicon obtained in beer. Commercial beers ranged from 6.4 to 56.5 mg L(-1) in silicon. Products derived from a grist of barley tended to contain more silicon than did those from a wheat-based grist, likely because of the high levels of silica in the retained husk layer of barley. Hops contain substantially more silicon than does grain, but quantitatively hops make a much smaller contribution than malt to the production of beer and therefore relatively less silicon in beer derives from them. During brewing the vast majority of the silicon remains with the spent grains; however, aggressive treatment during wort production in the brewhouse leads to increased extraction of silicon into wort and much of this survives into beer. It is confirmed that beer is a very rich source of silicon. (c) 2010 Society of Chemical Industry.

  6. A sub-atmospheric chemical vapor deposition process for deposition of oxide liner in high aspect ratio through silicon vias.

    Science.gov (United States)

    Lisker, Marco; Marschmeyer, Steffen; Kaynak, Mehmet; Tekin, Ibrahim

    2011-09-01

    The formation of a Through Silicon Via (TSV) includes a deep Si trench etching and the formation of an insulating layer along the high-aspect-ratio trench and the filling of a conductive material into the via hole. The isolation of the filling conductor from the silicon substrate becomes more important for higher frequencies due to the high coupling of the signal to the silicon. The importance of the oxide thickness on the via wall isolation can be verified using electromagnetic field simulators. To satisfy the needs on the Silicon dioxide deposition, a sub-atmospheric chemical vapor deposition (SA-CVD) process has been developed to deposit an isolation oxide to the walls of deep silicon trenches. The technique provides excellent step coverage of the 100 microm depth silicon trenches with the high aspect ratio of 20 and more. The developed technique allows covering the deep silicon trenches by oxide and makes the high isolation of TSVs from silicon substrate feasible which is the key factor for the performance of TSVs for mm-wave 3D packaging.

  7. On SA, CA, and GA numbers

    CERN Document Server

    Caveney, Geoffrey; Sondow, Jonathan

    2011-01-01

    Gronwall's function $G$ is defined for $n>1$ by $G(n)=\\frac{\\sigma(n)}{n \\log\\log n}$ where $\\sigma(n)$ is the sum of the divisors of $n$. We call an integer $N>1$ a \\emph{GA1 number} if $N$ is composite and $G(N) \\ge G(N/p)$ for all prime factors $p$ of $N$. We say that $N$ is a \\emph{GA2 number} if $G(N) \\ge G(aN)$ for all multiples $aN$ of $N$. In arXiv 1110.5078, we used Robin's and Gronwall's theorems on $G$ to prove that the Riemann Hypothesis (RH) is true if and only if 4 is the only number that is both GA1 and GA2. Here, we study GA1 numbers and GA2 numbers separately. We compare them with superabundant (SA) and colossally abundant (CA) numbers (first studied by Ramanujan). We give algorithms for computing GA1 numbers; the smallest one with more than two prime factors is 183783600, while the smallest odd one is 1058462574572984015114271643676625. We find nineteen GA2 numbers $\\le 5040$, and prove that a GA2 number $N>5040$ exists if and only if RH is false, in which case $N$ is even and $>10^{8576}$.

  8. Triagem em saúde mental infantil

    Directory of Open Access Journals (Sweden)

    Fabiana Vieira Gauy

    Full Text Available Este estudo foi conduzido para comparar os resultados de um procedimento grupal aberto e um procedimento individual estruturado para avaliação do comportamento da criança conforme o relato materno. Participaram deste estudo 29 mães que buscavam atendimento para seus filhos em uma unidade de saúde mental infanto-juvenil. As primeiras 15 mães que procuraram o serviço foram entrevistadas individualmente conforme um roteiro estruturado desenvolvido a partir do CBCL e depois foram entrevistadas em grupo, em formato aberto. As outras 14 mães participaram da entrevista grupal aberta e em seguida participaram da entrevista individual estruturada. Os resultados das entrevistas foram comparados tomando como referência as 67 categorias comportamentais identificadas a partir do roteiro individual e quatro variáveis contextuais relatadas nos dois procedimentos. Os resultados mostram que um número substancialmente maior de comportamentos-problema foi identificado através de entrevista individual estruturada do que através de entrevista grupal aberta realizada com os mesmos informantes. É possível que o uso de um roteiro estruturado em entrevistas grupais possa oferecer mais informações com otimização do tempo de avaliação.

  9. Saúde e meio ambiente nas cidades: os desafios da saúde ambiental

    Directory of Open Access Journals (Sweden)

    Nelson Gouveia

    1999-02-01

    Full Text Available Dentro de alguns poucos anos, nosso planeta contará com mais habitantes em áreas urbanas do que em áreas rurais. A urbanização desenfreada, sem mecanismos regulatórios e de controle, típica dos países periféricos, trouxe consigo enormes repercussões na saúde da população. Problemas como a insuficiência dos serviços básicos de saneamento, coleta e destinação adequada do lixo e condições precárias de moradia, tradicionalmente relacionados com a pobreza e o subdesenvolvimento, somam-se agora à poluição química e física do ar, da água e da terra, problemas ambientais antes considerados "modernos". Novamente, é sobre as populações mais carentes que recai a maior parte dos efeitos negativos da urbanização, gerando uma situação de extrema desigualdade e iniqüidade ambiental e em saúde. Para reverter esse quadro é preciso que haja uma reincorporação das questões do meio ambiente nas políticas de saúde, e a integração dos objetivos da saúde ambiental numa ampla estratégia de desenvolvimento sustentável. Uma abordagem mais integrada, com mecanismos intersetoriais que possibilitem um diálogo amplo entre as partes, trará enormes benefícios na conquista de melhores condições de vida nas cidades. A saúde ambiental hoje tem o desafio de promover uma melhor qualidade de vida e saúde nas cidades e a oportunidade de enfrentar o absurdo quadro de exclusão social, sob a perspectiva da eqüidade.In a matter of few years there will be more urban than rural dwellers worldwide. The rapid urbanisation lacking adequate control and regulatory mechanisms typical of developing countries, brought along huge effects to the health of the population Environmental problems traditionally related to poverty and underdevelopment such as insufficient provision of sanitation services, waste collection and disposal, and precarious housing conditions, are now added to environmental problems considered of "modern life" such as the

  10. Investigation on Silicon Thin Film Solar Cells

    Institute of Scientific and Technical Information of China (English)

    2003-01-01

    The preparation, current status and trends are investigated for silicon thin film solar cells. The advantages and disadvantages of amorphous silicon thin film, polycrystalline silicon thin film and mono-crystalline silicon thin film solar cells are compared. The future development trends are pointed out. It is found that polycrystalline silicon thin film solar cells will be more promising for application with great potential.

  11. A silicon electromechanical photodetector

    CERN Document Server

    Tallur, Siddharth

    2013-01-01

    Opto-mechanical systems have enabled wide-band optical frequency conversion and multi-channel all-optical radio frequency amplification. Realization of an on-chip silicon communication platform is limited by photodetectors needed to convert optical information to electrical signals for further signal processing. In this paper we present a coupled silicon micro-resonator, which converts near-IR optical intensity modulation at 174.2MHz and 1.198GHz into motional electrical current. This device emulates a photodetector which detects intensity modulation of continuous wave laser light in the full-width-at-half-maximum bandwidth of the mechanical resonance. The resonant principle of operation eliminates dark current challenges associated with convetional photodetectors.

  12. The CMS silicon tracker

    Energy Technology Data Exchange (ETDEWEB)

    Focardi, E. E-mail: focardi@pi.infn.it; Albergo, S.; Angarano, M.; Azzi, P.; Babucci, E.; Bacchetta, N.; Bader, A.; Bagliesi, G.; Basti, A.; Biggeri, U.; Bilei, G.M.; Bisello, D.; Boemi, D.; Bosi, F.; Borrello, L.; Bozzi, C.; Braibant, S.; Breuker, H.; Bruzzi, M.; Buffini, A.; Busoni, S.; Candelori, A.; Caner, A.; Castaldi, R.; Castro, A.; Catacchini, E.; Checcucci, B; Ciampolini, P.; Civinini, C.; Creanza, D.; D' Alessandro, R.; Da Rold, M.; Demaria, N.; De Palma, M.; Dell' Orso, R.; Della Marina, R.; Dutta, S.; Eklund, C.; Feld, L.; Fiore, L.; French, M.; Freudenreich, K.; Frey, A.; Fuertjes, A.; Giassi, A.; Giorgi, M.; Giraldo, A.; Glessing, B.; Gu, W.H.; Hall, G.; Hammarstrom, R.; Hebbeker, T.; Honma, A.; Hrubec, J.; Huhtinen, M.; Kaminsky, A.; Karimaki, V.; Koenig, St.; Krammer, M.; Lariccia, P.; Lenzi, M.; Loreti, M.; Leubelsmeyer, K.; Lustermann, W.; Maettig, P.; Maggi, G.; Mannelli, M.; Mantovani, G.; Marchioro, A.; Mariotti, C.; Martignon, G.; Evoy, B.Mc; Meschini, M.; Messineo, A.; Migliore, E.; My, S.; Paccagnella, A.; Palla, F.; Pandoulas, D.; Papi, A.; Parrini, G.; Passeri, D.; Pieri, M.; Piperov, S.; Potenza, R.; Radicci, V.; Raffaelli, F.; Raymond, M.; Rizzo, F.; Santocchia, A.; Schmitt, B.; Selvaggi, G.; Servoli, L.; Sguazzoni, G.; Siedling, R.; Silvestris, L.; Starodumov, A.; Stavitski, I.; Stefanini, G.; Surrow, B.; Tempesta, P.; Tonelli, G.; Tricomi, A.; Tuuva, T.; Vannini, C.; Verdini, P.G.; Viertel, G.; Xie, Z.; Yahong, Li; Watts, S.; Wittmer, B

    2000-10-11

    This paper describes the Silicon microstrip Tracker of the CMS experiment at LHC. It consists of a barrel part with 5 layers and two endcaps with 10 disks each. About 10 000 single-sided equivalent modules have to be built, each one carrying two daisy-chained silicon detectors and their front-end electronics. Back-to-back modules are used to read-out the radial coordinate. The tracker will be operated in an environment kept at a temperature of T=-10 deg. C to minimize the Si sensors radiation damage. Heavily irradiated detectors will be safely operated due to the high-voltage capability of the sensors. Full-size mechanical prototypes have been built to check the system aspects before starting the construction.

  13. Superhydrophobic Porous Silicon Surfaces

    Directory of Open Access Journals (Sweden)

    Paolo NENZI

    2011-12-01

    Full Text Available In this paper, we present an inexpensive technique to produce superhydrophobic surfaces from porous silicon. Superhydrophobic surfaces are a key technology for their ability to reduce friction losses in microchannels and their self cleaning properties. The morphology of a p-type silicon wafer is modified by a electrochemical wet etch to produce pores with controlled size and distribution and coated with a silane hydrophobic layer. Surface morphology is characterized by means of scanning electron microscope images. Large contact angles are observed on such surfaces and the results are compared with classical wetting models (Cassie and Wenzel suggesting a mixed Wenzel-Cassie behavior. The presented technique represents a cost-effective means for friction reduction in microfluidic applications, such as lab-on-a-chip.

  14. Electron beam silicon purification

    Energy Technology Data Exchange (ETDEWEB)

    Kravtsov, Anatoly [SIA ' ' KEPP EU' ' , Riga (Latvia); Kravtsov, Alexey [' ' KEPP-service' ' Ltd., Moscow (Russian Federation)

    2014-11-15

    Purification of heavily doped electronic grade silicon by evaporation of N-type impurities with electron beam heating was investigated in process with a batch weight up to 50 kilos. Effective temperature of the melt, an indicative parameter suitable for purification process characterization was calculated and appeared to be stable for different load weight processes. Purified material was successfully approbated in standard CZ processes of three different companies. Each company used its standard process and obtained CZ monocrystals applicable for photovoltaic application. These facts enable process to be successfully scaled up to commercial volumes (150-300 kg) and yield solar grade silicon. (copyright 2014 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  15. Haematic silicon in drowning.

    Science.gov (United States)

    Pierucci, Giovanni; Merlano, Federica; Chen, Yao; Sturini, Michela; Maraschi, Federica; Profumo, Antonella

    2016-04-01

    The aim of this paper was to evaluate silicon (Si) concentration in human whole ventricular blood as a further potential chemical marker in the diagnosis of drowning. We employed an acidic digestion for the extraction of soluble Si, and an alkaline digestion for the determination of total Si, including particulate matter, both arising from drowning medium. 29 suspected drowning situations, 24 in fresh water (Fw) and 5 in seawater (Sw), were examined. The difference in Si concentration between the left and right ventricular blood (Si ΔL-R) was measured and alkaline Si ΔL-R seems, indeed, a potentially significant complementary tool in the diagnosis of Fw drowning, because insoluble silicon fraction does not undergo hemo-dilution or hemo-concentration, and the ΔL-R is not affected by exogenous factors. In spite of the limited number of cases investigated, a good correlation was observed between the analytical results and the macro-microscopic autoptic findings.

  16. Silicon nanowire transistors

    CERN Document Server

    Bindal, Ahmet

    2016-01-01

    This book describes the n and p-channel Silicon Nanowire Transistor (SNT) designs with single and dual-work functions, emphasizing low static and dynamic power consumption. The authors describe a process flow for fabrication and generate SPICE models for building various digital and analog circuits. These include an SRAM, a baseband spread spectrum transmitter, a neuron cell and a Field Programmable Gate Array (FPGA) platform in the digital domain, as well as high bandwidth single-stage and operational amplifiers, RF communication circuits in the analog domain, in order to show this technology’s true potential for the next generation VLSI. Describes Silicon Nanowire (SNW) Transistors, as vertically constructed MOS n and p-channel transistors, with low static and dynamic power consumption and small layout footprint; Targets System-on-Chip (SoC) design, supporting very high transistor count (ULSI), minimal power consumption requiring inexpensive substrates for packaging; Enables fabrication of different types...

  17. A saúde mental em cuidados de saúde primários

    OpenAIRE

    Santos, Ana Isabel Monteiro dos

    2009-01-01

    As perturbações psiquiátricas no contexto da Clínica Geral / Medicina Geral e Familiar constituem um tema que tem vindo a ser estudado desde a década de 1960, sendo uma matéria complexa e com múltiplas implicações. Os estudos epidemiológicos mais recentes demonstram que as perturbações psiquiátricas e os problemas de saúde mental se tornaram a principal causa de incapacidade e uma das principais causas de morbilidade nas sociedades modernas. E, para além dos indivíduos que apresentam uma ...

  18. Educação em saúde como principal alternativa para promover a saúde do idoso

    Directory of Open Access Journals (Sweden)

    Danielli Gavião Mallmann

    2015-06-01

    Full Text Available Trata-se de uma revisão integrativa que objetivou identificar as evidências científicas sobre as ações educativas em saúde voltadas à promoção da saúde do idoso. A busca dos artigos foi realizada nas bases de dados Medline, Lilacs, BDENF, CINAHL e biblioteca virtual SciELO, por meio do cruzamento dos descritores Educação em Saúde, Idoso, Envelhecimento, Saúde do Idoso, Promoção da Saúde e Qualidade de vida, incluindo-se artigos publicados no período de 2003 a 2013, nos idiomas inglês, espanhol e português, realizados com idosos. Foram selecionados oito artigos, dos quais percebeu-se a qualidade de vida e a promoção do envelhecimento saudável como fatores resultantes das estratégias de educação em saúde. As ações de educação em saúde para idosos necessitam de metodologias que atentem para a complexidade do processo de envelhecimento e relacionem os fatores que cercam o indivíduo, como as crenças, os valores, as normas e os modos de vida.

  19. Building China's Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    @@ Ellis Rahhal and Andrew Schorr sit across from each other in the minimalist office of their tech startup,all clean lines and white linoleum floors.A pair of toothbrushes hint at many a late night hunched over their computers.Outside the window,the sun is slowly setting behind jagged mountains.The scene is classic Silicon Valley.But Rahhal and Schorr aren't in California.They're in suburban Beijing.

  20. Silicon Containing Photoresists.

    Science.gov (United States)

    1987-11-13

    generation of high resolution patterns. The vast majority of the commercial positive photoresists are comprised of a base soluble Novolac type resin (Cresol...plays a passive role. The generation of silicon containing Novolac- type resins represents one such effort. Workers at AT&T Bell Labs have prepared a...and formaldehyde (20). The silylated Novolac type resins were designed for use with substituted 1,2-napthoquinone-2-diazide sensitizers employed in

  1. Bringing Silicon Valley inside.

    Science.gov (United States)

    Hamel, G

    1999-01-01

    In 1998, Silicon Valley companies produced 41 IPOs, which by January 1999 had a combined market capitalization of $27 billion--that works out to $54,000 in new wealth creation per worker in a single year. Multiply the number of employees in your company by $54,000. Did your business create that much new wealth last year? Half that amount? It's not a group of geniuses generating such riches. It's a business model. In Silicon Valley, ideas, capital, and talent circulate freely, gathering into whatever combinations are most likely to generate innovation and wealth. Unlike most traditional companies, which spend their energy in resource allocation--a system designed to avoid failure--the Valley operates through resource attraction--a system that nurtures innovation. In a traditional company, people with innovative ideas must go hat in hand to the guardians of the old ideas for funding and for staff. But in Silicon Valley, a slew of venture capitalists vie to attract the best new ideas, infusing relatively small amounts of capital into a portfolio of ventures. And talent is free to go to the companies offering the most exhilarating work and the greatest potential rewards. It should actually be easier for large, traditional companies to set up similar markets for capital, ideas, and talent internally. After all, big companies often already have extensive capital, marketing, and distribution resources, and a first crack at the talent in their own ranks. And some of them are doing it. The choice is yours--you can do your best to make sure you never put a dollar of capital at risk, or you can tap into the kind of wealth that's being created every day in Silicon Valley.

  2. Silicon photonics manufacturing.

    Science.gov (United States)

    Zortman, William A; Trotter, Douglas C; Watts, Michael R

    2010-11-08

    Most demonstrations in silicon photonics are done with single devices that are targeted for use in future systems. One of the costs of operating multiple devices concurrently on a chip in a system application is the power needed to properly space resonant device frequencies on a system's frequency grid. We asses this power requirement by quantifying the source and impact of process induced resonant frequency variation for microdisk resonators across individual die, entire wafers and wafer lots for separate process runs. Additionally we introduce a new technique, utilizing the Transverse Electric (TE) and Transverse Magnetic (TM) modes in microdisks, to extract thickness and width variations across wafers and dice. Through our analysis we find that a standard six inch Silicon on Insulator (SOI) 0.35 μm process controls microdisk resonant frequencies for the TE fundamental resonances to within 1 THz across a wafer and 105 GHz within a single die. Based on demonstrated thermal tuner technology, a stable manufacturing process exhibiting this level of variation can limit the resonance trimming power per resonant device to 231 μW. Taken in conjunction with the power to compensate for thermal environmental variations, the expected power requirement to compensate for fabrication-induced non-uniformities is 17% of that total. This leads to the prediction that thermal tuning efficiency is likely to have the most dominant impact on the overall power budget of silicon photonics resonator technology.

  3. Silicon photonics fundamentals and devices

    CERN Document Server

    Deen, M Jamal

    2012-01-01

    The creation of affordable high speed optical communications using standard semiconductor manufacturing technology is a principal aim of silicon photonics research. This would involve replacing copper connections with optical fibres or waveguides, and electrons with photons. With applications such as telecommunications and information processing, light detection, spectroscopy, holography and robotics, silicon photonics has the potential to revolutionise electronic-only systems. Providing an overview of the physics, technology and device operation of photonic devices using exclusively silicon and related alloys, the book includes: * Basic Properties of Silicon * Quantum Wells, Wires, Dots and Superlattices * Absorption Processes in Semiconductors * Light Emitters in Silicon * Photodetectors , Photodiodes and Phototransistors * Raman Lasers including Raman Scattering * Guided Lightwaves * Planar Waveguide Devices * Fabrication Techniques and Material Systems Silicon Photonics: Fundamentals and Devices outlines ...

  4. Stabilization of elusive silicon oxides.

    Science.gov (United States)

    Wang, Yuzhong; Chen, Mingwei; Xie, Yaoming; Wei, Pingrong; Schaefer, Henry F; Schleyer, Paul von R; Robinson, Gregory H

    2015-06-01

    Molecular SiO2 and other simple silicon oxides have remained elusive despite the indispensable use of silicon dioxide materials in advanced electronic devices. Owing to the great reactivity of silicon-oxygen double bonds, as well as the low oxidation state of silicon atoms, the chemistry of simple silicon oxides is essentially unknown. We now report that the soluble disilicon compound, L:Si=Si:L (where L: = :C{N(2,6-(i)Pr2C6H3)CH}2), can be directly oxidized by N2O and O2 to give the carbene-stabilized Si2O3 and Si2O4 moieties, respectively. The nature of the silicon oxide units in these compounds is probed by spectroscopic methods, complementary computations and single-crystal X-ray diffraction.

  5. Radiation Hardening of Silicon Detectors

    CERN Multimedia

    Leroy, C; Glaser, M

    2002-01-01

    %RD48 %title\\\\ \\\\Silicon detectors will be widely used in experiments at the CERN Large Hadron Collider where high radiation levels will cause significant bulk damage. In addition to increased leakage current and charge collection losses worsening the signal to noise, the induced radiation damage changes the effective doping concentration and represents the limiting factor to long term operation of silicon detectors. The objectives are to develop radiation hard silicon detectors that can operate beyond the limits of the present devices and that ensure guaranteed operation for the whole lifetime of the LHC experimental programme. Radiation induced defect modelling and experimental results show that the silicon radiation hardness depends on the atomic impurities present in the initial monocrystalline material.\\\\ \\\\ Float zone (FZ) silicon materials with addition of oxygen, carbon, nitrogen, germanium and tin were produced as well as epitaxial silicon materials with epilayers up to 200 $\\mu$m thickness. Their im...

  6. A interdisciplinaridade vivenciada no PET-Saúde = The interdisciplinarity experienced in the PET- Saúde program

    Directory of Open Access Journals (Sweden)

    Assega, Mariana Lieka

    2010-01-01

    Full Text Available Introdução: A incorporação da equipe de saúde bucal na Estratégia de Saúde da Família (ESF, em 2000, possibilitou a adoção de uma postura mais ativa de atenção primária nesta área, visto que a saúde bucal consiste em parte integrante e inseparável da saúde do indivíduo. A interação dos profissionais da saúde torna-se possível por meio de iniciativas como o PET-Saúde, o qual fomenta a formação profissional articulada com os profissionais da ESF, bem como, o processo de integração ensino-serviço-comunidade na perspectiva da interdisciplinaridade. Objetivo: Relatar a vivência de estudantes ao realizar uma pesquisa interdisciplinar. Descrição da experiência: Esse relato foi vivenciado no projeto PET-Saúde da Faculdade de Medicina de Marília, no sub projeto Saúde do Homem, visando construir e validar um instrumento de coleta de dados por meio da Técnica Delphi, para auxiliar a equipe de saúde detectar precocemente agravos odontológicos, visto que no Brasil, o perfil de saúde bucal, na faixa etária de 35 a 44 anos, está comprometido. Os participantes, deste estudo, são discentes de enfermagem e medicina, preceptora cirurgiã-dentista e tutora docente enfermeira. Para as atividades educacionais utilizou-se a metodologia ativa de ensino-aprendizagem. Conclusão: Os movimentos reflexivos, os espaços de diálogos propiciaram o desenvolvimento da investigação científica. Além disso, a aproximação do processo de validação pela Técnica Delphi, também permitiu ampliação do conhecimento multidisciplinar sobre saúde bucal. Esta vivência possibilitou qualificar a formação acadêmico-profissional na linha da interdisciplinaridade, sendo importante sua multiplicação para o fortalecimento da interação entre os profissionais e a articulação das ações de saúde

  7. Cumulative Production Per Township - SaMiRa

    Data.gov (United States)

    U.S. Geological Survey, Department of the Interior — This dataset contains a selected township grid within the Sagebrush Mineral Resource Assessment project (SaMiRa) study area attributed with cumulative oil and gas...

  8. Desenvolvimento econômico, desigualdade e saúde

    Directory of Open Access Journals (Sweden)

    Pedro Reginaldo Prata

    1994-09-01

    Full Text Available O autor se refere a dimensão socioeconômica, individual e coletiva do fenômeno saúde-doença. Refere-se também ao fato das populações estarem sobre a influência desigual de fatores de risco e de proteção à saúde. Discute as desigualdades no desenvolvimento e a relação entre desenvolvimento, riqueza, saúde e justiça social. Questiona as teorias de desenvolvimento econômico, diferenciando desenvolvimento de crescimento. Cunha os conceitos de armadilha do desenvolvimento e refugiados sociais. Define uma comunidade saudável. Propõe a necessidade de mudança no modelo de desenvolvimento. Baliza o papel e as limitações do setor saúde no que diz respeito a iniqüidade social.

  9. Silicon processing for photovoltaics II

    CERN Document Server

    Khattak, CP

    2012-01-01

    The processing of semiconductor silicon for manufacturing low cost photovoltaic products has been a field of increasing activity over the past decade and a number of papers have been published in the technical literature. This volume presents comprehensive, in-depth reviews on some of the key technologies developed for processing silicon for photovoltaic applications. It is complementary to Volume 5 in this series and together they provide the only collection of reviews in silicon photovoltaics available.The volume contains papers on: the effect of introducing grain boundaries in silicon; the

  10. Laboratory course on silicon sensors

    CERN Document Server

    Crescio, E; Roe, S; Rudge, A

    2003-01-01

    The laboratory course consisted of four different mini sessions, in order to give the student some hands-on experience on various aspects of silicon sensors and related integrated electronics. The four experiments were. 1. Characterisation of silicon diodes for particle detection 2. Study of noise performance of the Viking readout circuit 3. Study of the position resolution of a silicon microstrip sensor 4. Study of charge transport in silicon with a fast amplifier The data in the following were obtained during the ICFA school by the students.

  11. Single crystalline mesoporous silicon nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Hochbaum, Allon; Dargas, Daniel; Hwang, Yun Jeong; Yang, Peidong

    2009-08-18

    Herein we demonstrate a novel electroless etching synthesis of monolithic, single-crystalline, mesoporous silicon nanowire arrays with a high surface area and luminescent properties consistent with conventional porous silicon materials. The photoluminescence of these nanowires suggest they are composed of crystalline silicon with small enough dimensions such that these arrays may be useful as photocatalytic substrates or active components of nanoscale optoelectronic devices. A better understanding of this electroless route to mesoporous silicon could lead to facile and general syntheses of different narrow bandgap semiconductor nanostructures for various applications.

  12. Social Networks in Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2006-01-01

    @@ Social network is a dominant, distinguishing characteristic of Silicon Valley. Because innovation entails coping with a high degree of uncertainty,such innovation is particularly dependent on networks.

  13. Large Brillouin Amplification in Silicon

    CERN Document Server

    Kittlaus, Eric A; Rakich, Peter T

    2015-01-01

    Strong Brillouin coupling has only recently been realized in silicon using a new class of optomechanical waveguides that yield both optical and phononic confinement. Despite these major advances, appreciable Brillouin amplification has yet to be observed in silicon. Using a new membrane-suspended silicon waveguide we report large Brillouin amplification for the first time, reaching levels greater than 5 dB for modest pump powers, and demonstrate a record low (5 mW) threshold for net amplification. This work represents a crucial advance necessary to realize high-performance Brillouin lasers and amplifiers in silicon.

  14. Discussion of CoSA: Clustering of Sparse Approximations

    Energy Technology Data Exchange (ETDEWEB)

    Armstrong, Derek Elswick [Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

    2017-03-07

    The purpose of this talk is to discuss the possible applications of CoSA (Clustering of Sparse Approximations) to the exploitation of HSI (HyperSpectral Imagery) data. CoSA is presented by Moody et al. in the Journal of Applied Remote Sensing (“Land cover classification in multispectral imagery using clustering of sparse approximations over learned feature dictionaries”, Vol. 8, 2014) and is based on machine learning techniques.

  15. Desigualdade social e saúde no Brasil

    Directory of Open Access Journals (Sweden)

    Neri Marcelo

    2002-01-01

    Full Text Available Esse artigo estuda a relação entre desigualdade social e saúde no Brasil. A estratégia usada foi avaliar as necessidades e o consumo dos serviços de saúde, bem como o acesso a seguro saúde ao longo da distribuição de renda. Adicionalmente, por meio da estimação de uma regressão logística, foram avaliados outros determinantes do consumo dos serviços de saúde, com o intuito de se conhecer aonde e quem utiliza esses serviços no país. Os dados foram extraídos da Pesquisas Nacional de Amostra por Domicilio da Fundação Instituto Brasileiro de Geografia e Estatística levada a campo em 1998. Em geral, observou-se que os indivíduos nos primeiros décimos da distribuição de renda têm pior acesso a seguro saúde, necessitam de maiores cuidados médicos, mas consomem menos os serviços de saúde. As outras características extra rendimento indicam que os principais determinantes para o consumo dos serviços de saúde estariam fortemente associados aos grupos sociais mais privilegiados (de maior escolaridade, acesso a seguro saúde, água, esgoto, luz, coleta de lixo e a fatores que apontam para capacidade de geração de oferta desses serviços no país.

  16. Review of underground salt attenuation measurements for SalSA

    Energy Technology Data Exchange (ETDEWEB)

    Connolly, Amy, E-mail: connolly@mps.ohio-state.edu [1040 Physics Research Building, 191 West Woodruff Avenue, Columbus, OH 43210-1117 (United States)

    2012-01-11

    We report on the status of the Salt Sensor Array (SalSA), a proposed experiment for detecting ultra-high energy neutrinos through the radio Cherenkov technique with an array of radio-microwave antennas embedded in a large, naturally occurring salt formation. We review the measurements to date aimed at assessing SalSA's feasibility, including a return visit of the Hockley Salt Mine in Hockley, Texas, and discuss the current status of the project.

  17. Microstructural investigation of Si-ion-irradiated single crystal 3C-SiC and SA-Tyrannohex SiC fiber-bonded composite at high temperatures

    Energy Technology Data Exchange (ETDEWEB)

    Ho, Chun-Yu [Institute of Nuclear Engineering and Science, National Tsing-Hua University, Hsinchu 30013, Taiwan (China); Tsai, Shuo-Cheng [Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 30013, Taiwan (China); Lin, Hua-Tay [Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States); Chen, Fu-Rong [Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 30013, Taiwan (China); Kai, Ji-Jung, E-mail: ceer0001@gmail.com [Institute of Nuclear Engineering and Science, National Tsing-Hua University, Hsinchu 30013, Taiwan (China); Department of Engineering and System Science, National Tsing-Hua University, Hsinchu 30013, Taiwan (China)

    2013-11-15

    Silicon carbides (SiCs) are considered as one of the promising candidates for structural and core materials used in fusion reactor and high temperature gas-cooled reactor (HTGR) due to its high thermal stability, and good resistance to irradiation and chemical attack. Single crystal 3C-SiC with less intrinsic defects was used to precisely characterize the radiation-induced defects in 3C-SiC. In addition, there are limited discussions related to radiation effect of SA-Tyrannohex fiber-bonded composite at high temperatures. Therefore, in this study, single crystal 3C-SiC thin film and SA-Tyrannohex SiC fiber-bonded composite were irradiated at 1000–1350 °C with 7 MeV Si{sup 3+} ion to simulate the neutron irradiation in reactors. The microstructure of the irradiated SiC was examined by using high resolution transmission electron microscope (HRTEM). In irradiated single crystal 3C-SiC, high resolution images showed that the planar defects were extrinsic stacking faulted loop with changing atomic sequences and intrinsic stacking faulted loop, i.e. vacancy loop. In addition, dislocation loops, voids, and edge dislocations in SA-Tyrannohex SiC fiber-bonded composite after irradiation were investigated. Besides, larger voids (with diameter 10–40 nm) formed in alumina with preferred orientation after irradiation perhaps resulting in degradation of strength of the SA-Tyrannohex SiC fiber-bonded composite.

  18. Apoio social e saúde entre idosos

    Directory of Open Access Journals (Sweden)

    Ramos Marília P.

    2002-01-01

    Full Text Available O presente artigo trata da relação entre a saúde dos idosos e relacionamentos sociais, bem como na interpretação e entendimento desta problemática sob a luz de dois enfoques teóricos: um macro, centrado na Teoria da Integração Social de Emile Durkheim e outro micro, centrado na Teoria das Trocas, de Peter Blau, com ênfase na Teoria da Eqüidade. A integração social (freqüência de contatos pode ter efeitos negativos na saúde, mas isto tem de ser medido pela qualidade dos contatos. Algumas conclusões apresentadas indicam que as relações sociais têm um efeito na saúde, no sentido de que as pessoas, nas sociedades modernas, esperam a reciprocidade, e, quando isto não é possível, principalmente na fase do envelhecimento, as pessoas sentem-se dependentes, e isso pode afetar a saúde de diferentes maneiras. Por outro lado, quando as pessoas têm problemas de saúde, elas experienciam uma falta de relações sociais balanceadas devido à incapacidade para trocar em bases iguais. Sendo assim, conclui-se que a relação entre relações sociais e saúde na população idosa pode ser uma relação recíproca.

  19. Solar silicon from directional solidification of MG silicon produced via the silicon carbide route

    Science.gov (United States)

    Rustioni, M.; Margadonna, D.; Pirazzi, R.; Pizzini, S.

    1986-01-01

    A process of metallurgical grade (MG) silicon production is presented which appears particularly suitable for photovoltaic (PV) applications. The MG silicon is prepared in a 240 KVA, three electrode submerged arc furnace, starting from high grade quartz and high purity silicon carbide. The silicon smelted from the arc furnace was shown to be sufficiently pure to be directionally solidified to 10 to 15 kg. After grinding and acid leaching, had a material yield larger than 90%. With a MG silicon feedstock containing 3 ppmw B, 290 ppmw Fe, 190 ppmw Ti, and 170 ppmw Al, blended with 50% of off grade electronic grade (EG) silicon to reconduct the boron content to a concentration acceptable for solar cell fabrication, the 99% of deep level impurities were concentrated in the last 5% of the ingot. Quite remarkably this material has OCV values higher tham 540 mV and no appreciable shorts due to SiC particles.

  20. Silicon on insulator with active buried regions

    Science.gov (United States)

    McCarthy, A.M.

    1996-01-30

    A method is disclosed for forming patterned buried components, such as collectors, sources and drains, in silicon-on-insulator (SOI) devices. The method is carried out by epitaxially growing a suitable sequence of single or multiple etch stop layers ending with a thin silicon layer on a silicon substrate, masking the silicon such that the desired pattern is exposed, introducing dopant and activating in the thin silicon layer to form doped regions. Then, bonding the silicon layer to an insulator substrate, and removing the silicon substrate. The method additionally involves forming electrical contact regions in the thin silicon layer for the buried collectors. 10 figs.

  1. New process of silicon carbide purification intended for silicon passivation

    Science.gov (United States)

    Barbouche, M.; Zaghouani, R. Benabderrahmane; Benammar, N. E.; Aglieri, V.; Mosca, M.; Macaluso, R.; Khirouni, K.; Ezzaouia, H.

    2017-01-01

    In this work, we report on a new, efficient and low cost process of silicon carbide (SiC) powder purification intended to be used in photovoltaic applications. This process consists on the preparation of porous silicon carbide layers followed by a photo-thermal annealing under oxygen atmosphere and chemical treatment. The effect of etching time on impurities removal efficiency was studied. Inductively coupled plasma atomic emission spectrometry (ICP-AES) results showed that the best result was achieved for an etching time of 10 min followed by gettering at 900 °C during 1 h. SiC purity is improved from 3N (99.9771%) to 4N (99.9946%). Silicon carbide thin films were deposited onto silicon substrates by pulsed laser deposition technique (PLD) using purified SiC powder as target. Significant improvement of the minority carrier lifetime was obtained encouraging the use of SiC as a passivation layer for silicon.

  2. Saúde, direito à saúde e justiça sanitária

    Directory of Open Access Journals (Sweden)

    João Arriscado Nunes

    2012-10-01

    Full Text Available Propõe‑se uma abordagem preliminar dos processos heterogéneos e contingentes através dos quais se definem e constituem mutuamente a saúde e o direito à saúde. São apresentadas e discutidas duas manifestações recentes dessa dinâmica. A primeira situa‑se na linha das transformações associadas às orientações de inspiração neoliberal no campo da saúde, apontando para a passagem da saúde como direito à saúde como imperativo, centrado na responsabilização individual e na centralidade da vigilância e da prevenção. A segunda, designada justiça sanitária, é exemplificada através de situações em que cidadãos, através da acção colectiva e mobilizando os vocabulários dos direitos e da justiça, procuram o reconhecimento como portadores de uma doença, os direitos associados a essa condição e a acção pública sobre situações que afectam a sua saúde.

  3. Vinyl ether silicones

    Energy Technology Data Exchange (ETDEWEB)

    Herzig, C.; Dauth, J.; Deubzer, B.; Weis, J. [Wacker-Chemie GmbH, Burghausen (Germany)

    1995-12-01

    Siloxanes with vinyl ether groups are prepared by hydrosilylation reaction of dihydrosiloxanes with divinyl ethers in excess. Different stoichiometry, produces linear copolymers of different viscosities and double bond concentrations always with an active vinyl ether group at each chain end. Polymerisations triggered by UV light were done with mixtures of these compounds and a series of onium salts. Very fast cure is observed even with low doses at 290 nm. V.E. silicones are found to cure essentially quantitative. The comparison with other highly reactive cationic monomers revealed that compounds are among the fastest curing prepolymers in cationic chemistry.

  4. Silicon production process evaluations

    Science.gov (United States)

    1982-01-01

    Chemical engineering analyses involving the preliminary process design of a plant (1,000 metric tons/year capacity) to produce silicon via the technology under consideration were accomplished. Major activities in the chemical engineering analyses included base case conditions, reaction chemistry, process flowsheet, material balance, energy balance, property data, equipment design, major equipment list, production labor and forward for economic analysis. The process design package provided detailed data for raw materials, utilities, major process equipment and production labor requirements necessary for polysilicon production in each process.

  5. Edgeless silicon pad detectors

    Science.gov (United States)

    Perea Solano, B.; Abreu, M. C.; Avati, V.; Boccali, T.; Boccone, V.; Bozzo, M.; Capra, R.; Casagrande, L.; Chen, W.; Eggert, K.; Heijne, E.; Klauke, S.; Li, Z.; Mäki, T.; Mirabito, L.; Morelli, A.; Niinikoski, T. O.; Oljemark, F.; Palmieri, V. G.; Rato Mendes, P.; Rodrigues, S.; Siegrist, P.; Silvestris, L.; Sousa, P.; Tapprogge, S.; Trocmé, B.

    2006-05-01

    We report measurements in a high-energy pion beam of the sensitivity of the edge region in "edgeless" planar silicon pad diode detectors diced through their contact implants. A large surface current on such an edge prevents the normal reverse biasing of the device, but the current can be sufficiently reduced by the use of a suitable cutting method, followed by edge treatment, and by operating the detector at low temperature. The depth of the dead layer at the diced edge is measured to be (12.5±8 stat..±6 syst.) μm.

  6. Edgeless silicon pad detectors

    Energy Technology Data Exchange (ETDEWEB)

    Perea Solano, B. [CERN, CH-1211 Geneva 23 (Switzerland)]. E-mail: blanca.perea.solano@cern.ch; Abreu, M.C. [LIP and University of Algarve, 8000 Faro (Portugal); Avati, V. [CERN, CH-1211 Geneva 23 (Switzerland); Boccali, T. [INFN Sez. di Pisa and Scuola Normale Superiore, Pisa (Italy); Boccone, V. [INFN Sez. di Genova and Universita di Genova, Genoa (Italy); Bozzo, M. [INFN Sez. di Genova and Universita di Genova, Genoa (Italy); Capra, R. [INFN Sez. di Genova and Universita di Genova, Genoa (Italy); Casagrande, L. [INFN Sez. di Roma 2 and Universita di Roma 2, Rome (Italy); Chen, W. [Brookhaven National Laboratory, Upton, NY 11973-5000 (United States); Eggert, K. [CERN, CH-1211 Geneva 23 (Switzerland); Heijne, E. [CERN, CH-1211 Geneva 23 (Switzerland); Klauke, S. [CERN, CH-1211 Geneva 23 (Switzerland); Li, Z. [Brookhaven National Laboratory, Upton, NY 11973-5000 (United States); Maeki, T. [Helsinki Institute of Physics, Helsinki (Finland); Mirabito, L. [CERN, CH-1211 Geneva 23 (Switzerland); Morelli, A. [INFN Sez. di Genova and Universita di Genova, Genoa (Italy); Niinikoski, T.O. [CERN, CH-1211 Geneva 23 (Switzerland); Oljemark, F. [Helsinki Institute of Physics, Helsinki (Finland); Palmieri, V.G. [Helsinki Institute of Physics, Helsinki (Finland); Rato Mendes, P. [LIP and University of Algarve, 8000 Faro (Portugal); Rodrigues, S. [LIP and University of Algarve, 8000 Faro (Portugal); Siegrist, P. [CERN, CH-1211 Geneva 23 (Switzerland); Silvestris, L. [INFN Sez. Di Bari, Bari (Italy); Sousa, P. [LIP and University of Algarve, 8000 Faro (Portugal); Tapprogge, S. [Helsinki Institute of Physics, Helsinki (Finland); Trocme, B. [Institut de Physique Nucleaire, Villeurbanne (France)

    2006-05-01

    We report measurements in a high-energy pion beam of the sensitivity of the edge region in 'edgeless' planar silicon pad diode detectors diced through their contact implants. A large surface current on such an edge prevents the normal reverse biasing of the device, but the current can be sufficiently reduced by the use of a suitable cutting method, followed by edge treatment, and by operating the detector at low temperature. The depth of the dead layer at the diced edge is measured to be (12.5{+-}8{sub stat.}.{+-}6{sub syst.}) {mu}m.

  7. The LHCb Silicon Tracker

    CERN Document Server

    Elsasser, Ch; Gallas Torreira, A; Pérez Trigo, A; Rodríguez Pérez, P; Bay, A; Blanc, F; Dupertuis, F; Haefeli, G; Komarov, I; Märki, R; Muster, B; Nakada, T; Schneider, O; Tobin, M; Tran, M T; Anderson, J; Bursche, A; Chiapolini, N; Saornil, S; Steiner, S; Steinkamp, O; Straumann, U; Vollhardt, A; Britsch, M; Schmelling, M; Voss, H; Okhrimenko, O; Pugatch, V

    2013-01-01

    The aim of the LHCb experiment is to study rare heavy quark decays and CP vio- lation with the high rate of beauty and charmed hadrons produced in $pp$ collisions at the LHC. The detector is designed as a single-arm forward spectrometer with excellent tracking and particle identification performance. The Silicon Tracker is a key part of the tracking system to measure the particle trajectories to high precision. This paper reports the performance as well as the results of the radiation damage monitoring based on leakage currents and on charge collection efficiency scans during the data taking in the LHC Run I.

  8. Light Emitting Porous Silicon

    Science.gov (United States)

    1993-05-01

    ml - mm m lm m ~ m m ThO report Page 14 preparation method which has been originally described by Wohler [23] leads to a bright yellow substance with...Solid State Commun. 81, 307 (1992). [221 H. Kautsky, and H. Zocher, Z. Phys. 9,267 (1992). L TNO report Page 28 [231 F. Wohler , Lieb. Ann. 127, 275 (1863...Netherlands Fax + 31 70 328 09 61 Phone + 31 70 326 42 21 TNO- report copy no. e FEL-93eo047r Lh Emitting Porous Silicon sitho(s): DTICHMi.P.Th

  9. Silicon carbide sewing thread

    Science.gov (United States)

    Sawko, Paul M. (Inventor)

    1995-01-01

    Composite flexible multilayer insulation systems (MLI) were evaluated for thermal performance and compared with currently used fibrous silica (baseline) insulation system. The systems described are multilayer insulations consisting of alternating layers of metal foil and scrim ceramic cloth or vacuum metallized polymeric films quilted together using ceramic thread. A silicon carbide thread for use in the quilting and the method of making it are also described. These systems provide lightweight thermal insulation for a variety of uses, particularly on the surface of aerospace vehicles subject to very high temperatures during flight.

  10. Silicon Valley Lifestyle

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2005-01-01

    @@ As we embrace the rapid developments of the new media age,competitiveness in the field of internet and computer technology is an increasingly crucial factor in stimulating new business,jobs and new industry in the region.Accelerating advancements in new media,internet,software and computer technologies offer new commercial opportunities and sources of economic revenue. Silicon Valley has been a model of the new age since its existence.While the dream place not only has a unique business model,but also has a very special lifestyle.

  11. Impurity doping processes in silicon

    CERN Document Server

    Wang, FFY

    1981-01-01

    This book introduces to non-experts several important processes of impurity doping in silicon and goes on to discuss the methods of determination of the concentration of dopants in silicon. The conventional method used is the discussion process, but, since it has been sufficiently covered in many texts, this work describes the double-diffusion method.

  12. Hydrodynamic slip in silicon nanochannels

    Science.gov (United States)

    Ramos-Alvarado, Bladimir; Kumar, Satish; Peterson, G. P.

    2016-03-01

    Equilibrium and nonequilibrium molecular dynamics simulations were performed to better understand the hydrodynamic behavior of water flowing through silicon nanochannels. The water-silicon interaction potential was calibrated by means of size-independent molecular dynamics simulations of silicon wettability. The wettability of silicon was found to be dependent on the strength of the water-silicon interaction and the structure of the underlying surface. As a result, the anisotropy was found to be an important factor in the wettability of these types of crystalline solids. Using this premise as a fundamental starting point, the hydrodynamic slip in nanoconfined water was characterized using both equilibrium and nonequilibrium calculations of the slip length under low shear rate operating conditions. As was the case for the wettability analysis, the hydrodynamic slip was found to be dependent on the wetted solid surface atomic structure. Additionally, the interfacial water liquid structure was the most significant parameter to describe the hydrodynamic boundary condition. The calibration of the water-silicon interaction potential performed by matching the experimental contact angle of silicon led to the verification of the no-slip condition, experimentally reported for silicon nanochannels at low shear rates.

  13. Ang Demokratikong Sistema at ang mga Modelo ng Pamumuno sa Pilipinas

    Directory of Open Access Journals (Sweden)

    F. P. A. Demeterio

    2010-06-01

    Full Text Available Maraming paraan ang pagsusuri sa problema ng pulitika sa Pilipinas.Para sa mga moralista at ideyalista, halimbawa, maaari itong tingnangamit ang perspektibo ng sistema ng pagpapahalaga (values at moralidad; para sa mga materyalista naman, maaari din itong himayin gamit ang perspektibo ng pagka-di-pantay-pantay ng kayamanan at kapangyarihan(unequal wealth and power ng ating mga mamamayan; o hindi kaya para sa mga eksperto sa sistema at istraktura, maaari din itong dalumatin gamit ang perspektibo ng ating marupok na burukrasya. Susubukan ng papel na ito na pag-aralan ang paksa sa pamamagitan ng pagsusuri sa konsepto ng pamumuno na hinihiling ng ating demokratikong sistema at sa kaparehong konseptong umiiiral naman sa kamalayan ng ating mga kababayan. Gagamitin ng pagsusuring ito, bilang teoretikal na balangkas, ang isang uri ng antropolohikalna teorya at pamamaraan na kilala bilang “kognitibong antropolohiya”(cognitive anthropology.

  14. MimoSA: a system for minimotif annotation

    Directory of Open Access Journals (Sweden)

    Kundeti Vamsi

    2010-06-01

    Full Text Available Abstract Background Minimotifs are short peptide sequences within one protein, which are recognized by other proteins or molecules. While there are now several minimotif databases, they are incomplete. There are reports of many minimotifs in the primary literature, which have yet to be annotated, while entirely novel minimotifs continue to be published on a weekly basis. Our recently proposed function and sequence syntax for minimotifs enables us to build a general tool that will facilitate structured annotation and management of minimotif data from the biomedical literature. Results We have built the MimoSA application for minimotif annotation. The application supports management of the Minimotif Miner database, literature tracking, and annotation of new minimotifs. MimoSA enables the visualization, organization, selection and editing functions of minimotifs and their attributes in the MnM database. For the literature components, Mimosa provides paper status tracking and scoring of papers for annotation through a freely available machine learning approach, which is based on word correlation. The paper scoring algorithm is also available as a separate program, TextMine. Form-driven annotation of minimotif attributes enables entry of new minimotifs into the MnM database. Several supporting features increase the efficiency of annotation. The layered architecture of MimoSA allows for extensibility by separating the functions of paper scoring, minimotif visualization, and database management. MimoSA is readily adaptable to other annotation efforts that manually curate literature into a MySQL database. Conclusions MimoSA is an extensible application that facilitates minimotif annotation and integrates with the Minimotif Miner database. We have built MimoSA as an application that integrates dynamic abstract scoring with a high performance relational model of minimotif syntax. MimoSA's TextMine, an efficient paper-scoring algorithm, can be used to

  15. Silicon-micromachined microchannel plates

    CERN Document Server

    Beetz, C P; Steinbeck, J; Lemieux, B; Winn, D R

    2000-01-01

    Microchannel plates (MCP) fabricated from standard silicon wafer substrates using a novel silicon micromachining process, together with standard silicon photolithographic process steps, are described. The resulting SiMCP microchannels have dimensions of approx 0.5 to approx 25 mu m, with aspect ratios up to 300, and have the dimensional precision and absence of interstitial defects characteristic of photolithographic processing, compatible with positional matching to silicon electronics readouts. The open channel areal fraction and detection efficiency may exceed 90% on plates up to 300 mm in diameter. The resulting silicon substrates can be converted entirely to amorphous quartz (qMCP). The strip resistance and secondary emission are developed by controlled depositions of thin films, at temperatures up to 1200 deg. C, also compatible with high-temperature brazing, and can be essentially hydrogen, water and radionuclide-free. Novel secondary emitters and cesiated photocathodes can be high-temperature deposite...

  16. Enhancement of silicon using micro-patterned surfaces of thin films

    Directory of Open Access Journals (Sweden)

    E Kaivosoja

    2010-04-01

    Full Text Available Micro-textured biomaterials might enhance cytocompatibility of silicon-based micro-electro-mechanical system (bio-MEMS dummies. Photolithography-physical vapour deposition was used to produce diamond-like carbon (DLC or Ti squares and circles on silicon, and also their inverse replicas; then DLC and Ti were compared for their guiding potential, using a SaOS-2 cell model. Scanning electron microscopy at 48 hours indicated cells were well-spread on large-sized patterns (several cells on one pattern and assumed the geometrical architecture of underlying features. Medium-sized patterns (slightly smaller than solitary indicator cells were inhabited by singular cells, which stretched from one island to another, assuming longitudinal or branching morphologies. On small-sized patterns (much smaller than individual cells cells covered large micro-textured areas, but cellular filopodia bypassed the bare silicon. Immunofluorescence and confocal laser scanning microscopy indicated that the actin cytoskeleton and vinculin-containing adhesion junctions were present on the patterned areas, but not on the bare silicon. Cell density/coverage disclosed a 3.4-3.7-fold preference for the biomaterial patterns over silicon substrate (p < 0.001. Differences in the cellular response between materials were lost at 120 hours when cells were confluent. The working hypothesis was proven; enhancement by micro-patterning depends on the pattern size, shape and material and can be used to improve biocompatibility during the initial integration phase of the device.

  17. Growth of silicon sheets from metallurgical-grade silicon

    Science.gov (United States)

    Ciszek, T.; Schietzelt, M.; Kazmerski, L. L.; Hurd, J. L.; Fernelius, B.

    1981-05-01

    Impure silicon is difficult to solidify in sheet form because of morphological proturberances which may result from constitutional supercooling. Sheet growth methods which require a specific crystallographic orientation or which are characterized by a narrow melt meniscus are most affected by this problem. The edge-supported pulling technique was applied to sheet growth of metallurgical grade silicon and DAR (Direct Arc Reactor) silicon. The 7 mm meniscus height associated with this technique allowed the growth of 5 cm wide sheets from both materials. In each case, the sheets were p-type.

  18. Tungo sa Hardin ng Tao: “Si Bonifacio ang pinakauna, hindi lamang sa Pilipinas, kundi sa buong Indonesia, oo, sa buong Asia na nanggaling sa, at edukado bilang, proletaryado, na nag-organisa ng mga proletaryo.” ni Tan Malaka

    Directory of Open Access Journals (Sweden)

    Ramon Guillermo

    2013-06-01

    Full Text Available Salin ito ng sanaysay na “Ke Taman Manusia” (sinulat taong 1943 nakathang-isip ng Indones na lider komunista na si Tan Malaka o Ibrahimgelar Datuk Tan Malaka (1897-1949 hinggil sa isang “Taman Manusia”o “Hardin ng Tao” na itatayo ng darating na Republika ng Indonesia sahinaharap. Dahil sa futuristiko nitong perspektiba, maihahalintuladang obrang ito ni Tan Malaka sa sanaysay ni Jose Rizal na “Filipinasdentro de cien años” (Ang Pilipinas sa loob ng isang dantaon (1891.Galing ito sa napakalaking akdang pilosopikal ni Tan Malaka napinamagatang Madilog: Materialisme, Dialektika, Logika (1948(Larawan 1 at tila tumatayo bilang pansarang mga repleksyon nito(Magnis-Suseno, 2005, pp. 205-233. Ang akdang ito ay unanginilathala noong 1951 ng Terbitan Widjaya sa Jakarta.

  19. Use of a molecular form technique for the penetration of supersaturated solutions of salicylic acid across silicone membranes and human skin in vitro.

    Science.gov (United States)

    Leveque, N; Raghavan, S L; Lane, M E; Hadgraft, J

    2006-08-01

    Permeation enhancement of salicylic acid (SA) from supersaturated solutions formed using a 'molecular form' technique was investigated. In a conventional cosolvent technique, two solvents are used, one in which the drug is considerably more soluble than the other. Propylene glycol and water have been predominantly used as cosolvents to create supersaturation in skin permeation enhancement. In this paper, we report the use of buffer solutions with different pHs as media for producing different molecular forms. Supersaturated solutions were prepared using pH 8:pH 2 (80:20 v/v), which gave a nominal pH when mixed of around 5. Model silicone membranes and human skin were used. Hydroxypropyl methyl cellulose (HPMC) was employed to stabilise the supersaturated states. Stability data showed that while the SA supersaturated solutions without HPMC crystallised between 15 min and 46 h depending on the degree of supersaturation, the solutions with HPMC were stable for more than 2 months. The flux of SA increased with the degree of saturation for solutions prepared in a 80:20 buffer pH 8/buffer pH 2 mixture. Although the fluxes of SA with and without HPMC were similar both through silicone membrane and human skin, HPMC was found to be effective in increasing the stability of supersaturated solutions of SA.

  20. Lipid membranes on nanostructured silicon.

    Energy Technology Data Exchange (ETDEWEB)

    Slade, Andrea Lynn; Lopez, Gabriel P. (University of New Mexico, Albuquerque, NM); Ista, Linnea K. (University of New Mexico, Albuquerque, NM); O' Brien, Michael J. (University of New Mexico, Albuquerque, NM); Sasaki, Darryl Yoshio; Bisong, Paul (University of New Mexico, Albuquerque, NM); Zeineldin, Reema R. (University of New Mexico, Albuquerque, NM); Last, Julie A.; Brueck, Stephen R. J. (University of New Mexico, Albuquerque, NM)

    2004-12-01

    A unique composite nanoscale architecture that combines the self-organization and molecular dynamics of lipid membranes with a corrugated nanotextured silicon wafer was prepared and characterized with fluorescence microscopy and scanning probe microscopy. The goal of this project was to understand how such structures can be assembled for supported membrane research and how the interfacial interactions between the solid substrate and the soft, self-assembled material create unique physical and mechanical behavior through the confinement of phases in the membrane. The nanometer scale structure of the silicon wafer was produced through interference lithography followed by anisotropic wet etching. For the present study, a line pattern with 100 nm line widths, 200 nm depth and a pitch of 360 nm pitch was fabricated. Lipid membranes were successfully adsorbed on the structured silicon surface via membrane fusion techniques. The surface topology of the bilayer-Si structure was imaged using in situ tapping mode atomic force microscopy (AFM). The membrane was observed to drape over the silicon structure producing an undulated topology with amplitude of 40 nm that matched the 360 nm pitch of the silicon structure. Fluorescence recovery after photobleaching (FRAP) experiments found that on the microscale those same structures exhibit anisotropic lipid mobility that was coincident with the silicon substructure. The results showed that while the lipid membrane maintains much of its self-assembled structure in the composite architecture, the silicon substructure indeed influences the dynamics of the molecular motion within the membrane.

  1. SA8000标准的来历

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    社会道德责任标准Social Accoutability 8000或简称SA8000。自1997年问世以来,受到了公众极大的关注,在美欧工商界引起了强烈反响。专家们认为,SA8000是ISO9000、ISO14000之后出现的又一个重要的国际性标准,并迟早会转化为ISO标准;通过SA8000认证将成为国际市场竞争中的又一重要武器。有远见的组织家应未

  2. PET-Saúde: micropolítica, formação e o trabalho em saúde

    Directory of Open Access Journals (Sweden)

    Kathleen Tereza da Cruz

    2015-12-01

    Full Text Available O presente artigo analisa os efeitos que podem ser coletados das múltiplas experiências cotidianas vivenciadas pelos tutores/as, preceptores/as e alunos/as participantes do Programa de Educação pelo Trabalho para Saúde (PET-Saúde quando se trata de utilizá-las para se pensarem transformações na micropolítica da formação universitária e no trabalho em saúde. Tem como eixo uma pergunta: O Programa Pet-Saúde, nos seus processos cotidianos, é capaz de produzir efeitos que alargam a matriz de formação que tem como característica principal os processos de ensignação? Mais do que polarizar entre o sim e o não, temos como objetivo colocar em discussão as apostas na formação e atuação do campo da produção do cuidado em saúde, tentando pensar o que têm sido esses campos no âmbito da educação brasileira, e como é possível re-inventar processos de formação que tomam muito mais as desaprendizagens e as potencialidades dos diferentes atores envolvidos.

  3. Sindicalismo, SUS e planos de saúde

    Directory of Open Access Journals (Sweden)

    José Augusto Pina

    Full Text Available Este artigo discute a interlocução do sindicalismo brasileiro com o Sistema Único de Saúde (SUS e os planos e seguros privados de saúde. São ponderadas algumas teses na Saúde Coletiva à luz de estudos mais recentes nas Ciências Sociais sobre o sindicalismo e realizada análise documental para o caso da Central Única dos Trabalhadores (CUT, tomado aqui como referência. Aponta-se a necessidade de considerar os pesos relativos que a ação sindical atribuiu a cada um dos aspectos da relação, SUS e planos privados de saúde, pelas distintas conjunturas do país. O conflito entre trabalhadores e empresas somado ao desemprego e à precarização do trabalho expõe os limites das coberturas assistenciais privadas e impele a representação sindical a pleitear a intervenção estatal. O trabalho refletiu sobre as distintas modalidades de ação sindical na empresa e no Estado. A complexidade dessa dinâmica fez emergir um setor sindical interessado na gestão da previdência complementar e dos planos de saúde e, ao mesmo tempo, recria as circunstâncias e traz novas possibilidades de as organizações sindicais se colocarem na cena política e aglutinar os interesses de amplos segmentos dos trabalhadores para pressionar o Estado na defesa da melhoria do sistema público de saúde.

  4. Single crystalline mesoporous silicon nanowires

    Energy Technology Data Exchange (ETDEWEB)

    Hochbaum, A.I.; Gargas, Daniel; Jeong Hwang, Yun; Yang, Peidong

    2009-08-04

    Herein we demonstrate a novel electroless etching synthesis of monolithic, single-crystalline, mesoporous silicon nanowire arrays with a high surface area and luminescent properties consistent with conventional porous silicon materials. These porous nanowires also retain the crystallographic orientation of the wafer from which they are etched. Electron microscopy and diffraction confirm their single-crystallinity and reveal the silicon surrounding the pores is as thin as several nanometers. Confocal fluorescence microscopy showed that the photoluminescence (PL) of these arrays emanate from the nanowires themselves, and their PL spectrum suggests that these arrays may be useful as photocatalytic substrates or active components of nanoscale optoelectronic devices.

  5. Ideal anodization of silicon

    Energy Technology Data Exchange (ETDEWEB)

    Yamani, Z.; Thompson, W.H.; AbuHassan, L.; Nayfeh, M.H. [Department of Physics, University of Illinois at Urbana-Champaign, 1110 W. Green Street, Urbana, Illinois 61801 (United States)

    1997-06-01

    Silicon has been anodized such that the porous layer is passivated with a homogeneous stretching phase by incorporating H{sub 2}O{sub 2} in the anodization mixture. Fourier transform infrared spectroscopy measurements show that the Si{endash}H stretching mode oriented perpendicular to the surface at {approximately}2100cm{sup {minus}1} dominates the spectrum with negligible contribution from the bending modes in the 600{endash}900cm{sup {minus}1} region. Material analysis using Auger electron spectroscopy shows that the samples have very little impurities, and that the luminescent layer is very thin (5{endash}10 nm). Scanning electron microscopy shows that the surface is smoother with features smaller than those of conventional samples. {copyright} {ital 1997 American Institute of Physics.}

  6. Silicon force sensor

    Science.gov (United States)

    Galambos, Paul C.; Crenshaw, Thomas B.; Nishida, Erik E.; Burnett, Damon J.; Lantz, Jeffrey W.

    2016-07-05

    The various technologies presented herein relate to a sensor for measurement of high forces and/or high load shock rate(s), whereby the sensor utilizes silicon as the sensing element. A plate of Si can have a thinned region formed therein on which can be formed a number of traces operating as a Wheatstone bridge. The brittle Si can be incorporated into a layered structure comprising ductile and/or compliant materials. The sensor can have a washer-like configuration which can be incorporated into a nut and bolt configuration, whereby tightening of the nut and bolt can facilitate application of a compressive preload upon the sensor. Upon application of an impact load on the bolt, the compressive load on the sensor can be reduced (e.g., moves towards zero-load), however the magnitude of the preload can be such that the load on the sensor does not translate to tensile stress being applied to the sensor.

  7. Monolithic silicon bolometers

    Science.gov (United States)

    Downey, P. M.; Jeffries, A. D.; Meyer, S. S.; Weiss, R.; Bachner, F. J.; Donnelly, J. P.; Lindley, W. T.; Mountain, R. W.; Silversmith, D. J.

    1984-01-01

    A new type of bolometer detector for the millimeter and submillimeter spectral range is described. The bolometer is constructed of silicon using integrated circuit fabrication techniques. Ion implantation is used to give controlled resistance vs temperature properties as well as extremely low 1/f noise contacts. The devices have been tested between 4.2 and 0.3 K. The best electrical NEP measured is 4 x 10 to the -16th W/Hz to the 1/2 at 0.35 K between 1- and 10-Hz modulation frequency. This device had a detecting area of 0.25 sq cm and a time constant of 20 msec at a bath temperature of 0.35 K.

  8. Product policy of SC Electrecord S.A.

    Directory of Open Access Journals (Sweden)

    Ph. D. Candidate Cristina Andreescu (Manolache

    2009-12-01

    Full Text Available The global brand has the advantage of the scale economy, facilitates the company image and prestige and sometimes benefits even from its origin country effect. Its use is quite difficult (the semantic variations can impede the use of the same brand. The international brands act as a restriction against standardisation (the product should not be differentiated as there are internationally accepted and recognized brands. This paper makes an overview description of the general market environment, but also of the arket environment of SC ELECTRECORD S.A.; it underlines the product characteristics as well as the commercial diagnosis within SC ELECTRECORD S.A.

  9. FaSa: A Fast and Stable Quadratic Placement Algorithm

    Institute of Scientific and Technical Information of China (English)

    HOU WenTing(侯文婷); HONG XianLong(洪先龙); WU WeiMin(吴为民); CAI YiCi(蔡懿慈)

    2003-01-01

    Placement is a critical step in VLSI design because it dominates overall speed andquality of design flow. In this paper, a new fast and stable placement algorithm called FaSa is pro-posed. It uses quadratic programming model and Lagrange multiplier method to solve placementproblems. And an incremental LU factorization method is used to solve equations for speeding up.The experimental results show that FaSa is very stable, much faster than previous algorithms andits total wire length is comparable with other algorithms.

  10. SaRDIn - A Safe Reconfigurable Distributed Interlocking

    DEFF Research Database (Denmark)

    Fantechi, A.; Gnesi, S.; Haxthausen, Anne Elisabeth;

    2016-01-01

    Current computer-based interlocking systems most often have a centralized design, with all logic residing in a single computer. Centralized interlockings are complex to design. Following the general trend in Cyber-Physical Systems, the SaRDIn (Safe Reconfigurable Distributed Interlockings) concept...... promises a radically simpler solution. The novelty of the SaRDIn concept is a fine-grained distribution of the logic over all processors deployed at the sensors and actuators along the track layout, i.e. within the track circuits, point machines, signals, etc. The advantages and drawbacks...

  11. For-LySa: UML for Authentication Analysis

    DEFF Research Database (Denmark)

    Buchholtz, Mikael; Montangero, Carlo; Perrone, Lara;

    2005-01-01

    The DEGAS project aims at enriching standard UML-centred development environments in such a way that the developers of global applications can exploit automated formal analyses with minimal overhead. In this paper, we present For-LySa, an instantiation of the DEGAS approach for authentication...... analysis, which exploits an existing analysis tool developed for the process calculus LySa. We discuss what information is needed for the analysis, and how to build the UML model of an authentication protocol in such a way that the needed information can be extracted from the model. We then present our...

  12. Automated silicon module assembly for the CMS silicon tracker

    CERN Document Server

    Surrow, B

    2001-01-01

    The CMS silicon tracker requires the assembly of about 20000 individual silicon detector modules. To ensure the assembly of such an amount with high, reproducible quality, an automated procedure has been developed for module assembly based on a high-precision robotic positioning machine. This procedure allows a much higher throughput and will result in much reduced manpower requirements than for traditional manual techniques. (1 refs).

  13. Integrated silicon and silicon nitride photonic circuits on flexible substrates.

    Science.gov (United States)

    Chen, Yu; Li, Mo

    2014-06-15

    Flexible integrated photonic devices based on crystalline materials on plastic substrates have a promising potential in many unconventional applications. In this Letter, we demonstrate a fully integrated photonic system including ring resonators and grating couplers, based on both crystalline silicon and silicon nitride, on flexible plastic substrate by using the stamping-transfer method. A high yield has been achieved by a simple, yet reliable transfer method without significant performance degradation.

  14. Acute pneumonitis secondary to subcutaneous silicone injection

    Directory of Open Access Journals (Sweden)

    Gopie P

    2011-06-01

    Full Text Available Priya Gopie, Sateesh Sakhamuri, Anu Sharma, Sanjeev Solomon, Surujpal TeelucksinghClinical Medical Sciences, University of the West Indies, St Augustine, TrinidadAbstract: Following silicone injection, end organ toxicity can occur. To our knowledge this report documents the first case of silicone embolization in the Caribbean and serves to highlight an emergent danger associated with its illicit use for cosmetic purposes in this region.Keywords: silicone, silicone embolism, silicone pneumonitis, alveolar hemorrhage, pneumonitis

  15. Silicon Holder For Molecular-Beam Epitaxy

    Science.gov (United States)

    Hoenk, Michael E.; Grunthaner, Paula J.; Grunthaner, Frank J.

    1993-01-01

    Simple assembly of silicon wafers holds silicon-based charge-coupled device (CCD) during postprocessing in which silicon deposited by molecular-beam epitaxy. Attains temperatures similar to CCD, so hotspots suppressed. Coefficients of thermal expansion of holder and CCD equal, so thermal stresses caused by differential thermal expansion and contraction do not develop. Holder readily fabricated, by standard silicon processing techniques, to accommodate various CCD geometries. Silicon does not contaminate CCD or molecular-beam-epitaxy vacuum chamber.

  16. Studies of silicon carbide and silicon carbide nitride thin films

    Science.gov (United States)

    Alizadeh, Zhila

    Silicon carbide semiconductor technology is continuing to advance rapidly. The excellent physical and electronic properties of silicon carbide recently take itself to be the main focused power device material for high temperature, high power, and high frequency electronic devices because of its large band gap, high thermal conductivity, and high electron saturation drift velocity. SiC is more stable than Si because of its high melting point and mechanical strength. Also the understanding of the structure and properties of semiconducting thin film alloys is one of the fundamental steps toward their successful application in technologies requiring materials with tunable energy gaps, such as solar cells, flat panel displays, optical memories and anti-reflecting coatings. Silicon carbide and silicon nitrides are promising materials for novel semiconductor applications because of their band gaps. In addition, they are "hard" materials in the sense of having high elastic constants and large cohesive energies and are generally resistant to harsh environment, including radiation. In this research, thin films of silicon carbide and silicon carbide nitride were deposited in a r.f magnetron sputtering system using a SiC target. A detailed analysis of the surface chemistry of the deposited films was performed using x-ray photoelectron spectroscopy (XPS), Fourier Transform Infrared Spectroscopy (FTIR) and Raman spectroscopy whereas structure and morphology was studied atomic force microscopy (AFM), and nonoindentation.

  17. Ressignificando Promoção de Saúde em Grupos para Profissionais da Saúde

    Directory of Open Access Journals (Sweden)

    Siegrid Kurzawa Zwiener dos Santos

    Full Text Available RESUMO Diferenças entre os conceitos de promoção e prevenção não estão claras para parte dos profissionais de saúde, incluindo médicos e estudantes de Medicina. Este trabalho objetivou problematizar o conceito de grupos de promoção de saúde para contribuir com o desenvolvimento da autonomia de profissionais de modo a avaliarem criticamente a maneira como vinham realizando educação em saúde e a refletirem sobre novas práticas. Foram realizados seis encontros no formato de círculos de cultura com profissionais da Estratégia Saúde da Família (ESF. Após esse trabalho, o grupo compreendeu a diferença entre promoção e prevenção. Promoção foi entendida como abordagem de condições de vida, cidadania, moradia, dinâmica familiar, como um processo que capacita para enfrentamentos, desenvolvimento do afeto, da discussão, do ouvir, do aceitar, do opinar e do oferecer. Os profissionais concluíram que é necessário desenvolver a autonomia dos grupos e indivíduos, ouvir a comunidade para compreender suas necessidades, resgatar o saber que a população possui e ver a saúde como um todo. Fatores biológicos foram relacionados à prevenção, e os sociais e psicológicos à promoção. O grupo é um instrumento importante para a promoção de saúde e deve ter uma metodologia problematizadora.

  18. Characterization of silicon-silicon carbide ceramic derived from carbon-carbon silicon carbide composites

    Energy Technology Data Exchange (ETDEWEB)

    Srivastava, Vijay K. [Indian Institute of Technology, Varanasi (India). Dept. of Mechanical Engineering; Krenkel, Walter [Univ. of Bayreuth (Germany). Dept. of Ceramic Materials Engineering

    2013-04-15

    The main objective of the present work is to process porous silicon - silicon carbide (Si - SiC) ceramic by the oxidation of carboncarbon silicon carbide (C/C - SiC) composites. Phase studies are performed on the oxidized porous composite to examine the changes due to the high temperature oxidation. Further, various characterization techniques are performed on Si- SiC ceramics in order to study the material's microstructure. The effects of various parameters such as fiber alignment (twill weave and short/chopped fiber) and phenolic resin type (resol and novolak) are characterized.

  19. Imprinted silicon-based nanophotonics

    DEFF Research Database (Denmark)

    Borel, Peter Ingo; Olsen, Brian Bilenberg; Frandsen, Lars Hagedorn

    2007-01-01

    We demonstrate and optically characterize silicon-on-insulator based nanophotonic devices fabricated by nanoimprint lithography. In our demonstration, we have realized ordinary and topology-optimized photonic crystal waveguide structures. The topology-optimized structures require lateral pattern ...

  20. Scattering characteristics from porous silicon

    Directory of Open Access Journals (Sweden)

    R. Sabet-Dariani

    2000-12-01

    Full Text Available   Porous silicon (PS layers come into existance as a result of electrochemical anodization on silicon. Although a great deal of research has been done on the formation and optical properties of this material, the exact mechanism involved is not well-understood yet.   In this article, first, the optical properties of silicon and porous silicon are described. Then, previous research and the proposed models about reflection from PS and the origin of its photoluminescence are reveiwed. The reflecting and scattering, absorption and transmission of light from this material, are then investigated. These experiments include,different methods of PS sample preparation their photoluminescence, reflecting and scattering of light determining different characteristics with respect to Si bulk.

  1. The History of Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2005-01-01

    @@ Just as Manchester was once the center for indus trial progress, the microelectronics industry also has a heartland. Silicon Valley is located in a thirty by ten miles strip between San Francisco and San Jose,California.

  2. Optical information capacity of silicon

    CERN Document Server

    Dimitropoulos, Dimitris

    2014-01-01

    Modern computing and data storage systems increasingly rely on parallel architectures where processing and storage load is distributed within a cluster of nodes. The necessity for high-bandwidth data links has made optical communication a critical constituent of modern information systems and silicon the leading platform for creating the necessary optical components. While silicon is arguably the most extensively studied material in history, one of its most important attributes, an analysis of its capacity to carry optical information, has not been reported. The calculation of the information capacity of silicon is complicated by nonlinear losses, phenomena that emerge in optical nanowires as a result of the concentration of optical power in a small geometry. Nonlinear losses are absent in silica glass optical fiber and other common communication channels. While nonlinear loss in silicon is well known, noise and fluctuations that arise from it have never been considered. Here we report sources of fluctuations...

  3. Ultra-fast silicon detectors

    Energy Technology Data Exchange (ETDEWEB)

    Sadrozinski, H. F.-W., E-mail: hartmut@scipp.ucsc.edu [Santa Cruz Institute for Particle Physics, UC Santa Cruz, Santa Cruz, CA 95064 (United States); Ely, S.; Fadeyev, V.; Galloway, Z.; Ngo, J.; Parker, C.; Petersen, B.; Seiden, A.; Zatserklyaniy, A. [Santa Cruz Institute for Particle Physics, UC Santa Cruz, Santa Cruz, CA 95064 (United States); Cartiglia, N.; Marchetto, F. [INFN Torino, Torino (Italy); Bruzzi, M.; Mori, R.; Scaringella, M.; Vinattieri, A. [University of Florence, Department of Physics and Astronomy, Sesto Fiorentino, Firenze (Italy)

    2013-12-01

    We propose to develop a fast, thin silicon sensor with gain capable to concurrently measure with high precision the space (∼10 μm) and time (∼10 ps) coordinates of a particle. This will open up new application of silicon detector systems in many fields. Our analysis of detector properties indicates that it is possible to improve the timing characteristics of silicon-based tracking sensors, which already have sufficient position resolution, to achieve four-dimensional high-precision measurements. The basic sensor characteristics and the expected performance are listed, the wide field of applications are mentioned and the required R and D topics are discussed. -- Highlights: •We are proposing thin pixel silicon sensors with 10's of picoseconds time resolution. •Fast charge collection is coupled with internal charge multiplication. •The truly 4-D sensors will revolutionize imaging and particle counting in many applications.

  4. Silicon Drift Detectors for ALICE

    CERN Document Server

    Navach, F; CERN. Geneva

    1992-01-01

    The Silicon Drift Detector (SDD) is a semiconductor, not yet extensively used in HEP experiment, which has an excellent spatial resolution and granularity about comparable to a pixel device requiring a number of readout channels two order of magnitude less.

  5. Social Networks in Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    Joseph; Leu

    2006-01-01

      Social network is a dominant, distinguishing characteristic of Silicon Valley. Because innovation entails coping with a high degree of uncertainty,such innovation is particularly dependent on networks.……

  6. Mga Kuwento-Kuwento ng Baliw: Lihis na Pagkilos sa Mga Maikling-Kuwentong Tagalog

    Directory of Open Access Journals (Sweden)

    Diana Ziganay

    1990-12-01

    Full Text Available Ang sulating ito ay nalikha upang magbigay ng isang pagsusuri at pagtatalakay sa pagbuo ng konsepto ng abnormalidad o kakaibang kilos o pananaw buhat sa mga piling uri ng panitikang Pilipinong naisulat sa wikang Ingles noong ika-1900 hanggang 1945. Pag-uukulan ng pansin dito ang panahon at kalagayang binanggit, ang mga suliraning binanggit, ang maga suliranin ng pagbuo ng panitikang Pilipino sa Ingles, at ang daloy ng kaisipan ng mga manunulat na may kaugnayan sa pag-unawa ng konsepto ng abnormalidad na sumasalamin sa ilang mga piling sulatin, tuwiran man o di tuwiran.

  7. Saúde mental nas práticas em saúde: a experiência do PROLIG

    Directory of Open Access Journals (Sweden)

    Samantha Mucci

    Full Text Available O presente trabalho apresenta o relato de experiências do Serviço de Atenção Psicossocial Integrada em Saúde (SAPIS nos Programas de Ligação (PROLIG. O SAPIS foi implantado em junho de 2002, no Hospital São Paulo (HSP, com o objetivo de promover uma atenção mais ampla às necessidades gerais e específicas do hospital no que diz respeito aos aspectos psicossociais bem como de reorganizar a inclusão de profissionais de saúde mental nas enfermarias e ambulatórios. Esse estudo tem como objetivo descrever a atuação do psicólogo como profissional de ligação em saúde mental no atendimento às demandas específicas de unidades do HSP. A tarefa do profissional de ligação em saúde mental envolve a assistência psicológica ao paciente e seu familiar assim como o desempenho do papel de especialista em saúde mental junto à equipe multiprofissional. Temos encontrado em nossa prática, no entanto, algumas dificuldades para a implementação e a manutenção de algumas propostas. Concluímos que a atuação do psicólogo como profissional de ligação de saúde mental tem promovido mudanças nos cuidados em saúde nessa instituição, porém ainda exige uma profunda reflexão e maior envolvimento da instituição e de políticas de saúde que viabilizem mudanças estruturais para a construção de uma efetiva prática integral e integrada nessa área.

  8. Evanescent field phase shifting in a silicon nitride waveguide using a coupled silicon slab

    DEFF Research Database (Denmark)

    Jensen, Asger Sellerup; Oxenløwe, Leif Katsuo; Green, William M. J.

    2015-01-01

    An approach for electrical modulation of low-loss silicon nitride waveguides is proposed, using a silicon nitride waveguide evanescently loaded with a thin silicon slab. The thermooptic phase-shift characteristics are investigated in a racetrack resonator configuration.......An approach for electrical modulation of low-loss silicon nitride waveguides is proposed, using a silicon nitride waveguide evanescently loaded with a thin silicon slab. The thermooptic phase-shift characteristics are investigated in a racetrack resonator configuration....

  9. Silicone-Rubber Stitching Seal

    Science.gov (United States)

    Wang, D. S.

    1985-01-01

    Fabric products protected from raveling by coating threads and filling stitching holes with silicone rubber. Uncored silicone rubber applied to stitching lines with air-pressurized sealant gun. Next, plastic release film placed on coated side, and blanket flipped over so release film lies underneath. Blanket then bagged and adhesive cured under partial vacuum of about 3.5 psi or under pressure. Applications include balloons, parachutes, ultralight aircraft, sails, rescue harnesses, tents, or other fabric products highly stressed in use.

  10. Silicon superconducting quantum interference device

    Energy Technology Data Exchange (ETDEWEB)

    Duvauchelle, J. E.; Francheteau, A.; Marcenat, C.; Lefloch, F., E-mail: francois.lefloch@cea.fr [Université Grenoble Alpes, CEA - INAC - SPSMS, F-38000 Grenoble (France); Chiodi, F.; Débarre, D. [Université Paris-sud, CNRS - IEF, F-91405 Orsay - France (France); Hasselbach, K. [Université Grenoble Alpes, CNRS - Inst. Néel, F-38000 Grenoble (France); Kirtley, J. R. [Center for probing at nanoscale, Stanford University, Palo Alto, California 94305-4045 (United States)

    2015-08-17

    We have studied a Superconducting Quantum Interference Device (SQUID) made from a single layer thin film of superconducting silicon. The superconducting layer is obtained by heavily doping a silicon wafer with boron atoms using the gas immersion laser doping technique. The SQUID is composed of two nano-bridges (Dayem bridges) in a loop and shows magnetic flux modulation at low temperature and low magnetic field. The overall behavior shows very good agreement with numerical simulations based on the Ginzburg-Landau equations.

  11. Silicon Sensors for HEP Experiments

    CERN Document Server

    Dierlamm, Alexander Hermann

    2017-01-01

    With increasing luminosity of accelerators for experiments in High Energy Physics the demands on the detectors increase as well. Especially tracking and vertexing detectors made of silicon sensors close to the interaction point need to be equipped with more radiation hard devices. This article introduces the different types of silicon sensors, describes measures to increase radiation hardness and provides an overview of present upgrade choices of HEP experiments.

  12. Programa de saúde mental Programme in mental health

    Directory of Open Access Journals (Sweden)

    Cid Guimarães

    1975-12-01

    Full Text Available É apresentado o programa de Saúde Mental decorrente de convênio estabelecido pela Secretaria da Saúde do Estado de São Paulo com a Universidade de São Paulo, através da Faculdade de Saúde Pública. Este convênio tem por finalidade a realização de estudos na área de Saúde Mental, tais como assistência psiquiátrica preventiva e pesquisas visando a medir transtornos mentais através de casos de óbito e na população da cidade e de cursos e atividades curriculares e extra-curriculares.The School of Public Health is conducting a project, sponsored by the Health Department of the State of S. Paulo Government, aiming at: studying the integration of a team of mental health workers in a polivalent community health center; carrying out two large surveys on the incidence and prevalence of mental disorders and some of their characteristics; promoting courses and seminars on Mental Health for the personnel of Community Health Centers.

  13. Fonoaudiologia em saúde pública

    Directory of Open Access Journals (Sweden)

    Regina M. Freire

    1992-06-01

    Full Text Available Objetivou-se obter o entendimento das funções do fonoaudiólogo enquanto profissional da saúde. Discutem-se as dificuldades ligadas à implantação de um serviço novo, estranho às Unidades Básicas de Saúde. A seguir, analisa-se a demanda pelo serviço de Fonoaudiologia em postos de saúde, e verifica-se que 32% da população que busca esse serviço está em idade escolar e vem encaminhada pelas escolas, com queixa de problemas de aprendizagem. Uma aproximação maior dessas crianças, através do atendimento fonoaudiológico, delineia uma outra realidade: a de que não se pode considerar como distúrbio/desvio/problema/patologia marcas gráficas que se constituem como indícios do choque entre o processo de letramento e o de alfabetização. Entendendo a problemática do ponto de vista da saúde pública, propõe-se um programa de atendimento ao professor, cujo objetivo é o esclarecimento da escola com relação ao seu papel de co-construtora do processo de letramento da criança, devolvendo-lhe a responsabilidade pelo sucesso e/ou fracasso da alfabetização.

  14. KELEMBAGAAN DAN STRATEGI PENINGKATAN DAYA SAING KOMODITAS CABAI KAPUPATEN GARUT

    Directory of Open Access Journals (Sweden)

    Silmi Tsurayya

    2015-03-01

    Full Text Available The objectives of this study were to identify supply chains, analyze the institutions, formulate strategies for competitiveness enhancement, design competitiveness enhancement model, and determine the main strategies in competitiveness enhancement of chili pepper in Garut District. This study used primary data (observations, interviews, and questionnaires and secondary data (literature study. The data were processed and analyzed by Descriptive Analysis, SWOT Analysis, the House Model, and Pairwise Comparison. The results of this study showed that: 1 there were 6 supply chain structures in chili pepper distribution; 2 the major institutional sectors contributed to competitiveness enhancement of chili pepper including public sector, voluntary sector, and private sector; 3 SWOT Analysis obtained 15 alternative strategies; 4 the House Model as competitiveness enhancement model had 3 pillars consisting of products, human resource, and institutional and marketing; 5 the main strategies in competitiveness enhancement of chili pepper included Increase in the number of productions, Market expansion, and Partnership Strengthening and development. The managerial implications of the study suggest: 1 land expansion and plant arrangement pattern to ensure continuity of production quantities; 2 Optimization of the role of Agribusiness Sub-Terminal as the marketing institution; and 3 Maximization in the government’s role in facilitating farmer groups with associations or corporations.Keywords: institutional, the house model, competitiveness, chili, SWOTABSTRAKPenelitian ini bertujuan mengidentifikasi rantai pasok, menganalisis kelembagaan, merumuskan strategi peningkatan daya saing, merancang model peningkatan daya saing, dan menentukan strategi utama dalam peningkatan daya saing  komoditas cabai di Kabupaten Garut. Data yang digunakan terdiri dari data primer (observasi, wawancara, dan kuesioner dan data sekunder (studi literatur. Metode pengolahan dan

  15. High-yield synthesis of silicon carbide nanowires by solar and lamp ablation

    Science.gov (United States)

    Lu, Hai-bo; Chan, Benjamin C. Y.; Wang, Xiaolin; Tong Chua, Hui; Raston, Colin L.; Albu-Yaron, Ana; Levy, Moshe; Popowitz-Biro, Ronit; Tenne, Reshef; Feuermann, Daniel; Gordon, Jeffrey M.

    2013-08-01

    We report a reasonably high yield (∼50%) synthesis of silicon carbide (SiC) nanowires from silicon oxides and carbon in vacuum, by novel solar and lamp photothermal ablation methods that obviate the need for catalysis, and allow relatively short reaction times (∼10 min) in a nominally one-step process that does not involve toxic reagents. The one-dimensional core/shell β-SiC/SiOx nanostructures—characterized by SEM, TEM, HRTEM, SAED, XRD and EDS—are typically several microns long, with core and outer diameters of about 10 and 30 nm, respectively. HRTEM revealed additional distinctive nanoscale structures that also shed light on the formation pathways.

  16. Deposited low temperature silicon GHz modulator

    CERN Document Server

    Lee, Yoon Ho Daniel; Lipson, Michal

    2013-01-01

    The majority of silicon photonics is built on silicon-on-insulator (SOI) wafers while the majority of electronics, including CPUs and memory, are built on bulk silicon wafers, limiting broader acceptance of silicon photonics. This discrepancy is a result of silicon photonics's requirement for a single-crystalline silicon (c-Si) layer and a thick undercladding for optical guiding that bulk silicon wafers to not provide. While the undercladding problem can be partially addressed by substrate removal techniques, the complexity of co-integrating photonics with state-of-the-art transistors and real estate competition between electronics and photonics remain problematic. We show here a platform for deposited GHz silicon photonics based on polycrystalline silicon with high optical quality suitable for high performance electro-optic devices. We demonstrate 3 Gbps polysilicon electro-optic modulator fabricated on a deposited polysilicon layer fully compatible with CMOS backend integration. These results open up an arr...

  17. Direct Production of Silicones From Sand

    Energy Technology Data Exchange (ETDEWEB)

    Larry N. Lewis; F.J. Schattenmann: J.P. Lemmon

    2001-09-30

    Silicon, in the form of silica and silicates, is the second most abundant element in the earth's crust. However the synthesis of silicones (scheme 1) and almost all organosilicon chemistry is only accessible through elemental silicon. Silicon dioxide (sand or quartz) is converted to chemical-grade elemental silicon in an energy intensive reduction process, a result of the exceptional thermodynamic stability of silica. Then, the silicon is reacted with methyl chloride to give a mixture of methylchlorosilanes catalyzed by cooper containing a variety of tract metals such as tin, zinc etc. The so-called direct process was first discovered at GE in 1940. The methylchlorosilanes are distilled to purify and separate the major reaction components, the most important of which is dimethyldichlorosilane. Polymerization of dimethyldichlorosilane by controlled hydrolysis results in the formation of silicone polymers. Worldwide, the silicones industry produces about 1.3 billion pounds of the basic silicon polymer, polydimethylsiloxane.

  18. Silicon active photonic devices

    Science.gov (United States)

    Dimitropoulos, Dimitrios

    Active photonic devices utilizing the optical nonlinearities of silicon have emerged in the last 5 years and the effort for commercial photonic devices in the material that has been the workhorse of electronics has been building up since. This dissertation presents the theory for some of these devices. We are concerned herein with CW lasers, amplifiers and wavelength converters that are based on the Raman effect. There have already been cursory experimental demonstrations of these devices and some of their limitations are already apparent. Most of the limitations observed are because of the appearance of effects that are competing with stimulated Raman scattering. Under the high optical powers that are necessary for the Raman effect (tens to hundrends of mW's) the process of optical two-photon (TPA) absorption occurs. The absorption of optical power that it causes itself is weak but in the process electrons and holes are generated which can further absorb light through the free-carrier absorption effect (FCA). The effective "lifetime" that these carriers have determines the magnitude of the FCA loss. We present a model for the carrier lifetime in Silicon-On-Insulator (SOI) waveguides and numerical simulations to understand how this critical parameter varies and how it can be controlled. A p-i-n junction built along SOI waveguides can help achieve lifetime of the order of 20--100 ps but the price one has to pay is on-chip electrical power consumption on the order of 100's of mWs. We model CW Raman lasers and we find that the carrier lifetime reduces the output power. If the carrier lifetime exceeds a certain "critical" value optical losses become overwhelming and lasing is impossible. As we show, in amplifiers, the nonlinear loss does not only result in diminished gain, but also in a higher noise figure. Finally the effect of Coherent anti-Stokes Raman scattering (CARS) is examined. The effect is important because with a pump frequency at 1434nm coherent power

  19. WRKY Transcription Factors Involved in Activation of SA Biosynthesis Genes

    Directory of Open Access Journals (Sweden)

    Bol John F

    2011-05-01

    Full Text Available Abstract Background Increased defense against a variety of pathogens in plants is achieved through activation of a mechanism known as systemic acquired resistance (SAR. The broad-spectrum resistance brought about by SAR is mediated through salicylic acid (SA. An important step in SA biosynthesis in Arabidopsis is the conversion of chorismate to isochorismate through the action of isochorismate synthase, encoded by the ICS1 gene. Also AVRPPHB SUSCEPTIBLE 3 (PBS3 plays an important role in SA metabolism, as pbs3 mutants accumulate drastically reduced levels of SA-glucoside, a putative storage form of SA. Bioinformatics analysis previously performed by us identified WRKY28 and WRKY46 as possible regulators of ICS1 and PBS3. Results Expression studies with ICS1 promoter::β-glucuronidase (GUS genes in Arabidopsis thaliana protoplasts cotransfected with 35S::WRKY28 showed that over expression of WRKY28 resulted in a strong increase in GUS expression. Moreover, qRT-PCR analyses indicated that the endogenous ICS1 and PBS3 genes were highly expressed in protoplasts overexpressing WRKY28 or WRKY46, respectively. Electrophoretic mobility shift assays indentified potential WRKY28 binding sites in the ICS1 promoter, positioned -445 and -460 base pairs upstream of the transcription start site. Mutation of these sites in protoplast transactivation assays showed that these binding sites are functionally important for activation of the ICS1 promoter. Chromatin immunoprecipitation assays with haemagglutinin-epitope-tagged WRKY28 showed that the region of the ICS1 promoter containing the binding sites at -445 and -460 was highly enriched in the immunoprecipitated DNA. Conclusions The results obtained here confirm results from our multiple microarray co-expression analyses indicating that WRKY28 and WRKY46 are transcriptional activators of ICS1 and PBS3, respectively, and support this in silico screening as a powerful tool for identifying new components of stress

  20. Promoção da saúde, qualidade de vida e iniquidade em saúde: reflexões para a saúde pública.

    Directory of Open Access Journals (Sweden)

    Aline Rodrigues de ALMEIDA

    2016-01-01

    Full Text Available A ideia de promover saúde tem se tornado uma energia fundamental no movimento de saúde coletiva, no qual saúde é um fenômeno social e marcado por iniquidades. Este trabalho teve como objetivo compreender as relações entre promoção da saúde e iniquidades de acesso e assistência em saúde, identificandoos entraves para uma prática equânime da saúde pública com ênfase à qualidade de vida. Os diferentes perfis de doença e suas mediações sociais ultrapassam os estudos de variação biológica e incorpora o foco na dimensão social das vulnerabilidades. Para promover saúde no Brasil, é indissociável do enfrentamento de uma realidade de iniquidades históricas de grandes proporções que impõem desafios cotidianos não apenas ao setor de saúde, mas a todos aqueles que constroem políticas públicas. A qualidade de vida depende da satisfação das necessidades básicas de todos os cidadãos, propondo uma gestão baseada na solidariedade social, uma visão holística dos problemas e a redução das iniquidades. A promoção da saúde em um país tão desigual como o Brasil propõe um desafio constante aos atores envolvidos no sistema de saúde. A compreensão das iniquidades em saúde para estabelecer uma assistência holística é um processo difícil, mas extremamente relevante para a saúde pública.

  1. Silicon Tetrafluoride on Io

    CERN Document Server

    Schaefer, L; Schaefer, Laura

    2005-01-01

    Silicon tetrafluoride (SiF4) is observed in terrestrial volcanic gases and is predicted to be the major F - bearing species in low temperature volcanic gases on Io (Schaefer and Fegley, 2005b). SiF4 gas is also a potential indicator of silica-rich crust on Io. We used F/S ratios in terrestrial and extraterrestrial basalts, and gas/lava enrichment factors for F and S measured at terrestrial volcanoes to calculate equilibrium SiF4/SO2 ratios in volcanic gases on Io. We conclude that SiF4 can be produced at levels comparable to the observed NaCl/SO2 gas ratio. We also considered potential loss processes for SiF4 in volcanic plumes and in Io's atmosphere including ion-molecule reactions, electron chemistry, photochemistry, reactions with the major atmospheric constituents, and condensation. Photochemical destruction (tchem ~ 266 days) and/or condensation as Na2SiF6 (s) appear to be the major sinks for SiF4. We recommend searching for SiF4 with infrared spectroscopy using its 9.7 micron band as done on Earth.

  2. Collimation: a silicon solution

    CERN Multimedia

    2007-01-01

    Silicon crystals could be used very efficiently to deflect high-energy beams. Testing at CERN has produced conclusive results, which could pave the way for a new generation of collimators. The set of five crystals used to test the reflection of the beams. The crystals are 0.75 mm wide and their alignment is adjusted with extreme precision. This figure shows the deflection of a beam by channelling and by reflection in the block of five crystals. Depending on the orientation of the crystals: 1) The beam passes without "seeing" the crystals and is not deflected 2) The beam is deflected by channelling (with an angle of around 100 μrad) 3) The beam is reflected (with an angle of around 50 μrad). The intensity of the deflected beam is illustrated by the intensity of the spot. The spot of the reflected beam is clearly more intense than that one of the channelled beam, demonstrating the efficiency of t...

  3. Nanoporous silicon oxide memory.

    Science.gov (United States)

    Wang, Gunuk; Yang, Yang; Lee, Jae-Hwang; Abramova, Vera; Fei, Huilong; Ruan, Gedeng; Thomas, Edwin L; Tour, James M

    2014-08-13

    Oxide-based two-terminal resistive random access memory (RRAM) is considered one of the most promising candidates for next-generation nonvolatile memory. We introduce here a new RRAM memory structure employing a nanoporous (NP) silicon oxide (SiOx) material which enables unipolar switching through its internal vertical nanogap. Through the control of the stochastic filament formation at low voltage, the NP SiOx memory exhibited an extremely low electroforming voltage (∼ 1.6 V) and outstanding performance metrics. These include multibit storage ability (up to 9-bits), a high ON-OFF ratio (up to 10(7) A), a long high-temperature lifetime (≥ 10(4) s at 100 °C), excellent cycling endurance (≥ 10(5)), sub-50 ns switching speeds, and low power consumption (∼ 6 × 10(-5) W/bit). Also provided is the room temperature processability for versatile fabrication without any compliance current being needed during electroforming or switching operations. Taken together, these metrics in NP SiOx RRAM provide a route toward easily accessed nonvolatile memory applications.

  4. Sequence determinants for DNA packaging specificity in the S. aureus pathogenicity island SaPI1.

    Science.gov (United States)

    Bento, Joana C; Lane, Kristin D; Read, Erik K; Cerca, Nuno; Christie, Gail E

    2014-01-01

    The SaPIs and their relatives are a family of genomic islands that exploit helper phages for high frequency horizontal transfer. One of the mechanisms used by SaPIs to accomplish this molecular piracy is the redirection of the helper phage DNA packaging machinery. SaPIs encode a small terminase subunit that can be substituted for that of the phage. In this study we have determined the initial packaging cleavage sites for helper phage 80α, which uses the phage-encoded small terminase subunit, and for SaPI1, which uses the SaPI-encoded small terminase subunit. We have identified a 19nt SaPI1 sequence that is necessary and sufficient to allow high frequency 80α transduction of a plasmid by a terminase carrying the SaPI1-encoded small subunit. We also show that the hybrid enzyme with the SaPI1 small terminase subunit is capable of generalized transduction.

  5. Ultrafast Terahertz Conductivity of Photoexcited Nanocrystalline Silicon

    DEFF Research Database (Denmark)

    Cooke, David; MacDonald, A. Nicole; Hryciw, Aaron;

    2007-01-01

    The ultrafast transient ac conductivity of nanocrystalline silicon films is investigated using time-resolved terahertz spectroscopy. While epitaxial silicon on sapphire exhibits a free carrier Drude response, silicon nanocrystals embedded in glass show a response that is best described by a class......The ultrafast transient ac conductivity of nanocrystalline silicon films is investigated using time-resolved terahertz spectroscopy. While epitaxial silicon on sapphire exhibits a free carrier Drude response, silicon nanocrystals embedded in glass show a response that is best described...

  6. Next generation structural silicone glazing

    Directory of Open Access Journals (Sweden)

    Charles D. Clift

    2015-06-01

    Full Text Available This paper presents an advanced engineering evaluation, using nonlinear analysis of hyper elastic material that provides significant improvement to structural silicone glazing (SSG design in high performance curtain wall systems. Very high cladding wind pressures required in hurricane zones often result in bulky SSG profile dimensions. Architectural desire for aesthetically slender curtain wall framing sight-lines in combination with a desire to reduce aluminium usage led to optimization of silicone material geometry for better stress distribution.To accomplish accurate simulation of predicted behaviour under structural load, robust stress-strain curves of the silicone material are essential. The silicone manufacturer provided physical property testing via a specialized laboratory protocol. A series of rigorous curve fit techniques were then made to closely model test data in the finite element computer analysis that accounts for nonlinear strain of hyper elastic silicone.Comparison of this advanced design technique to traditional SSG design highlights differences in stress distribution contours in the silicone material. Simplified structural engineering per the traditional SSG design method does not provide accurate forecasting of material and stress optimization as shown in the advanced design.Full-scale specimens subject to structural load testing were performed to verify the design capacity, not only for high wind pressure values, but also for debris impact per ASTM E1886 and ASTM E1996. Also, construction of the test specimens allowed development of SSG installation techniques necessitated by the unique geometry of the silicone profile. Finally, correlation of physical test results with theoretical simulations is made, so evaluation of design confidence is possible. This design technique will introduce significant engineering advancement to the curtain wall industry.

  7. Palladium interaction with silicon carbide

    Energy Technology Data Exchange (ETDEWEB)

    Gentile, M., E-mail: Marialuisa.Gentile@manchester.ac.uk [Centre for Nuclear Energy Technology (C-NET), School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL (United Kingdom); Xiao, P. [Materials Science Centre, School of Materials, The University of Manchester, Manchester M13 9PL (United Kingdom); Abram, T. [Centre for Nuclear Energy Technology (C-NET), School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, Manchester M13 9PL (United Kingdom)

    2015-07-15

    In this work the palladium interaction with silicon carbide is investigated by means of complementary analytical techniques such as thermogravimetry (TG), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Thermoscans were carried out on pellets of palladium, α-SiC and β-SiC high purity powders in the temperature range comprised between 293 K and 1773 K, in order to study the effect of temperature on the palladium-silicon carbide reaction. Thermoscans of α-SiC pellets containing 5 at.%Pd show that during differential calorimetry scans three exothermic peaks occurred at 773 K, 1144 K and 1615 K, while thermoscans of β-SiC pellets containing 3 at.%Pd and 5 at.%Pd do not show peaks. For the pellet α-SiC–5 at.%Pd XRD spectra reveal that the first peak is associated with the formation of Pd{sub 3}Si and SiO{sub 2} phases, while the second peak and the third peak are correlated with the formation of Pd{sub 2}Si phase and the active oxidation of silicon carbide respectively. Thermogravimetry scans show weight gain and weight loss peaks due to the SiO{sub 2} phase formation and the active oxidation. Additionally XPS fittings reveal the development of SiC{sub x}O{sub y} phase during the first exothermic peak up to the temperature of 873 K. The experimental data reveals that alpha silicon carbide is attacked by palladium at lower temperatures than beta silicon carbide and the reaction mechanism between silicon carbide and palladium is strongly affected by silicon carbide oxidation.

  8. Palladium interaction with silicon carbide

    Science.gov (United States)

    Gentile, M.; Xiao, P.; Abram, T.

    2015-07-01

    In this work the palladium interaction with silicon carbide is investigated by means of complementary analytical techniques such as thermogravimetry (TG), differential scanning calorimetry (DSC), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Thermoscans were carried out on pellets of palladium, α-SiC and β-SiC high purity powders in the temperature range comprised between 293 K and 1773 K, in order to study the effect of temperature on the palladium-silicon carbide reaction. Thermoscans of α-SiC pellets containing 5 at.%Pd show that during differential calorimetry scans three exothermic peaks occurred at 773 K, 1144 K and 1615 K, while thermoscans of β-SiC pellets containing 3 at.%Pd and 5 at.%Pd do not show peaks. For the pellet α-SiC-5 at.%Pd XRD spectra reveal that the first peak is associated with the formation of Pd3Si and SiO2 phases, while the second peak and the third peak are correlated with the formation of Pd2Si phase and the active oxidation of silicon carbide respectively. Thermogravimetry scans show weight gain and weight loss peaks due to the SiO2 phase formation and the active oxidation. Additionally XPS fittings reveal the development of SiCxOy phase during the first exothermic peak up to the temperature of 873 K. The experimental data reveals that alpha silicon carbide is attacked by palladium at lower temperatures than beta silicon carbide and the reaction mechanism between silicon carbide and palladium is strongly affected by silicon carbide oxidation.

  9. Isolation of Asticcacaulis sp. SA7, a novel agar-degrading alphaproteobacterium.

    Science.gov (United States)

    Hosoda, Akifumi; Sakai, Masao

    2006-03-01

    An agar-degrading bacterium, strain SA7, was isolated from plant roots cultivated in soil. Analysis of the 16S rDNA sequence showed that strain SA7 is affiliated with the genus Asticcacaulis. Strain SA7 produced extracellular agarase, and grew utilizing agar in the culture medium as sole carbon source. Zymogram analysis showed that strain SA7 extracellularly secreted single agarase protein (about 70 kDa).

  10. Indentation fatigue in silicon nitride, alumina and silicon carbide ceramics

    Indian Academy of Sciences (India)

    A K Mukhopadhyay

    2001-04-01

    Repeated indentation fatigue (RIF) experiments conducted on the same spot of different structural ceramics viz. a hot pressed silicon nitride (HPSN), sintered alumina of two different grain sizes viz. 1 m and 25 m, and a sintered silicon carbide (SSiC) are reported. The RIF experiments were conducted using a Vicker’s microhardness tester at various loads in the range 1–20 N. Subsequently, the gradual evolution of the damage was characterized using an optical microscope in conjunction with the image analysing technique. The materials were classified in the order of the decreasing resistance against repeated indentation fatigue at the highest applied load of 20 N. It was further shown that there was a strong influence of grain size on the development of resistance against repeated indentation fatigue on the same spot. Finally, the poor performance of the sintered silicon carbide was found out to be linked to its previous thermal history.

  11. Silicon-to-silicon wafer bonding using evaporated glass

    DEFF Research Database (Denmark)

    Weichel, Steen; Reus, Roger De; Lindahl, M.

    1998-01-01

    Anodic bending of silicon to silicon 4-in. wafers using an electron-beam evaporated glass (Schott 8329) was performed successfully in air at temperatures ranging from 200 degrees C to 450 degrees C. The composition of the deposited glass is enriched in sodium as compared to the target material....... The roughness of the as-deposited films was below 5 nm and was found to be unchanged by annealing at 500 degrees C for 1 h in air. No change in the macroscopic edge profiles of the glass film was found as a function of annealing; however, small extrusions appear when annealing above 450 degrees C. Annealing...... of silicon/glass structures in air around 340 degrees C for 15 min leads to stress-free structures. Bonded wafer pairs, however, show no reduction in stress and always exhibit compressive stress. The bond yield is larger than 95% for bonding temperatures around 350 degrees C and is above 80% for bonding...

  12. Aspectos relevantes sobre tuberculose para profissionais de saúde

    Directory of Open Access Journals (Sweden)

    Alexandre Daronco

    2012-01-01

    Full Text Available A Tuberculose (TB é uma patologia infectocontagiosa com clínica ampla cujo agentecausador é o Mycobacterium tuberculosis (Bacilo de Koch, uma micobactéria aeróbia estrita. Apesar de tratar-se dedoença antiga, que acomete seres humanos há séculos, sendo uma importante causa de morte no mundo inteiro,diferentes pesquisas do Ministério da Saúde apontam números preocupantes no tocante a novos casos. Materiais eMétodos: O presente artigo de revisão procura, de forma objetiva e clara, explicitar os principais aspectos de interessepara profissionais de saúde no tocante a Tuberculose doença. O artigo divide-se em tópicos: Defi nição, Sintomatologia,Diagnóstico, Tratamento, Multirresistência, Profi laxia, Formas de Contágio e Formas de Prevenção. Foram utilizadasreferências atuais sobre o tema, incluindo Manuais, Guidelines e Artigos científicos diversos de bases de dados comoUp to Date e Science Direct. Discussão: Sinais e sintomas da doença aumentam o grau de suspeição da mesma, oque torna o pedido de exames para confirmação da infecção dentro de tempo hábil para instituição da terapêuticaadequada. Assim como diagnóstico e tratamento, medidas para evitar o contágio, em serviços de saúde, locaiscom aglomerações humanas e em residências, são de fundamental importância no combate a tuberculose. Osprofissionais de saúde devem atentar para possíveis casos de resistência aos fármacos e as indicações de profilaxia,pois tais variáveis são de extrema relevância no controle da disseminação da doença. Conclusão: Por tratar-se dedoença infecciosa que pode acometer todas as classes sociais, além de possuir formas diferentes de acometimento,o conhecimento básico acerca da Tuberculose é deveras imprescindível em serviços de saúde, desde a atençãoprimária até os centros de saúde com alta tecnologia.

  13. Por um programa preventivo em saúde mental do trabalhador na brigada militar

    Directory of Open Access Journals (Sweden)

    Fernanda Spanier Amador

    Full Text Available O presente artigo argumenta sobre a importância de políticas de Saúde e Segurança Públicas que sustentem programas voltados à saúde do trabalhador na Brigada Militar. Aborda, mais especificamente, a necessidade de ações preventivas e promotoras de saúde mental nesse âmbito.

  14. Zitkala-Sa and the Problem of Regionalism: Nations, Narratives, and Critical Traditions

    Science.gov (United States)

    Totten, Gary

    2005-01-01

    Although Yankton Sioux writer Zitkala-Sa (Gertrude Bonnin, 1876-1938) was, as P. Jane Hafen notes, "virtually unknown for many decades," much critical work has appeared since Dexter Fisher's 1979 article,"Zitkala-Sa: Evolution of a Writer." Some critics desiring to bring Zitkala-Sa into the conversation about turn-of-the-century American women…

  15. 76 FR 7511 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170...

    Science.gov (United States)

    2011-02-10

    ... Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 Airplanes; and Model ERJ 190-100..., contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), Technical Publications Section (PC 060), Av.... 39.13 by adding the following new AD: Empresa Brasileira de Aeronautica S.A. (EMBRAER): Docket...

  16. Política de recursos humanos em saúde: análise de documentos oficiais do ministério da saúde

    OpenAIRE

    Luciana Pavanelli Von Gal de Almeida

    2007-01-01

    A reforma do setor saúde no Brasil levou à criação do Sistema Único de Saúde que contemplou a saúde como um direito social. Dessa forma, na atualidade, a saúde é tratada como um bem universal a ser provido para todos os cidadãos, implicando no princípio da equidade, em que cada cidadão tem direito a ações e serviços requeridos para manutenção e recuperação de sua saúde. Esse ideário tem forte implicação com os recursos humanos em saúde, em termos de definições políticas e técnicas relacionada...

  17. Silicon-micromachined microchannel plates

    Energy Technology Data Exchange (ETDEWEB)

    Beetz, Charles P. E-mail: NanoSystem@aol.com; Boerstler, Robert; Steinbeck, John; Lemieux, Bryan; Winn, David R. E-mail: winn@fair1.fairfield.edu

    2000-03-11

    Microchannel plates (MCP) fabricated from standard silicon wafer substrates using a novel silicon micromachining process, together with standard silicon photolithographic process steps, are described. The resulting SiMCP microchannels have dimensions of {approx}0.5 to {approx}25 {mu}m, with aspect ratios up to 300, and have the dimensional precision and absence of interstitial defects characteristic of photolithographic processing, compatible with positional matching to silicon electronics readouts. The open channel areal fraction and detection efficiency may exceed 90% on plates up to 300 mm in diameter. The resulting silicon substrates can be converted entirely to amorphous quartz (qMCP). The strip resistance and secondary emission are developed by controlled depositions of thin films, at temperatures up to 1200 deg. C, also compatible with high-temperature brazing, and can be essentially hydrogen, water and radionuclide-free. Novel secondary emitters and cesiated photocathodes can be high-temperature deposited or nucleated in the channels or the first strike surface. Results on resistivity, secondary emission and gain are presented.

  18. Silicon-micromachined microchannel plates

    Science.gov (United States)

    Beetz, Charles P.; Boerstler, Robert; Steinbeck, John; Lemieux, Bryan; Winn, David R.

    2000-03-01

    Microchannel plates (MCP) fabricated from standard silicon wafer substrates using a novel silicon micromachining process, together with standard silicon photolithographic process steps, are described. The resulting SiMCP microchannels have dimensions of ˜0.5 to ˜25 μm, with aspect ratios up to 300, and have the dimensional precision and absence of interstitial defects characteristic of photolithographic processing, compatible with positional matching to silicon electronics readouts. The open channel areal fraction and detection efficiency may exceed 90% on plates up to 300 mm in diameter. The resulting silicon substrates can be converted entirely to amorphous quartz (qMCP). The strip resistance and secondary emission are developed by controlled depositions of thin films, at temperatures up to 1200°C, also compatible with high-temperture brazing, and can be essentially hydrogen, water and radionuclide-free. Novel secondary emitters and cesiated photocathodes can be high-temperature deposited or nucleated in the channels or the first strike surface. Results on resistivity, secondary emission and gain are presented.

  19. Silicon nitride equation of state

    Science.gov (United States)

    Brown, Robert C.; Swaminathan, Pazhayannur K.

    2017-01-01

    This report presents the development of a global, multi-phase equation of state (EOS) for the ceramic silicon nitride (Si3N4).1 Structural forms include amorphous silicon nitride normally used as a thin film and three crystalline polymorphs. Crystalline phases include hexagonal α-Si3N4, hexagonal β-Si3N4, and the cubic spinel c-Si3N4. Decomposition at about 1900 °C results in a liquid silicon phase and gas phase products such as molecular nitrogen, atomic nitrogen, and atomic silicon. The silicon nitride EOS was developed using EOSPro which is a new and extended version of the PANDA II code. Both codes are valuable tools and have been used successfully for a variety of material classes. Both PANDA II and EOSPro can generate a tabular EOS that can be used in conjunction with hydrocodes. The paper describes the development efforts for the component solid phases and presents results obtained using the EOSPro phase transition model to investigate the solid-solid phase transitions in relation to the available shock data that have indicated a complex and slow time dependent phase change to the c-Si3N4 phase. Furthermore, the EOSPro mixture model is used to develop a model for the decomposition products; however, the need for a kinetic approach is suggested to combine with the single component solid models to simulate and further investigate the global phase coexistences.

  20. Silicon Heat Pipe Array

    Science.gov (United States)

    Yee, Karl Y.; Ganapathi, Gani B.; Sunada, Eric T.; Bae, Youngsam; Miller, Jennifer R.; Beinsford, Daniel F.

    2013-01-01

    Improved methods of heat dissipation are required for modern, high-power density electronic systems. As increased functionality is progressively compacted into decreasing volumes, this need will be exacerbated. High-performance chip power is predicted to increase monotonically and rapidly with time. Systems utilizing these chips are currently reliant upon decades of old cooling technology. Heat pipes offer a solution to this problem. Heat pipes are passive, self-contained, two-phase heat dissipation devices. Heat conducted into the device through a wick structure converts the working fluid into a vapor, which then releases the heat via condensation after being transported away from the heat source. Heat pipes have high thermal conductivities, are inexpensive, and have been utilized in previous space missions. However, the cylindrical geometry of commercial heat pipes is a poor fit to the planar geometries of microelectronic assemblies, the copper that commercial heat pipes are typically constructed of is a poor CTE (coefficient of thermal expansion) match to the semiconductor die utilized in these assemblies, and the functionality and reliability of heat pipes in general is strongly dependent on the orientation of the assembly with respect to the gravity vector. What is needed is a planar, semiconductor-based heat pipe array that can be used for cooling of generic MCM (multichip module) assemblies that can also function in all orientations. Such a structure would not only have applications in the cooling of space electronics, but would have commercial applications as well (e.g. cooling of microprocessors and high-power laser diodes). This technology is an improvement over existing heat pipe designs due to the finer porosity of the wick, which enhances capillary pumping pressure, resulting in greater effective thermal conductivity and performance in any orientation with respect to the gravity vector. In addition, it is constructed of silicon, and thus is better

  1. The interdisciplinarity experienced in the PET- Saúde program A interdisciplinaridade vivenciada no PET-Saúde

    Directory of Open Access Journals (Sweden)

    Sueli Moreira Pirolo

    2010-01-01

    Full Text Available Introduction: The incorporation of the oral health team in the Family Health Strategy (ESF, in 2000, enabled the adoption of a more active attitude of Primary Health Care in this field, in as much as oral health consists of an inseparable and integral part of the individual’s health. The interaction of health professionals becomes possible through policies like “PET-Saúde” which promotes the professional formation articulated with the ESF professionals as well as the process of integration of teaching, service and community in the perspective of interdisciplinarity. Objective: To report the experience of students during an interdisciplinary research. Description of the experience: This report was experienced in “PET-Saúde” of the Faculty of Medicine of Marília, at the “Man’s Health” subproject aiming at elaborating and validating a data collection instrument through Delphi Technique in order to help the health care team to detect early dental problems because of the damaged oral health pattern of the age group between 35 and 44 in Brazil. The members of this study are: medical and nursing students, a dentist preceptor and a nursing tutor. For the educational activities, the active methodology of teaching-learning was used. Conclusion: The reflexive actions, the moments for discussions provided the development of scientific investigation. The approximation of the process of validation through Delphi Technique also allowed the expansion of multidisciplinary knowledge on oral health. This experience made it possible to qualify the academic-professional formation on the interdisciplinary approach, and it’s important to strengthen the interaction among professionals and the articulation of health actions.Introdução: A incorporação da equipe de saúde bucal na Estratégia de Saúde da Família (ESF, em 2000, possibilitou a adoção de uma postura mais ativa de atenção primária nesta área, visto que a saúde bucal consiste

  2. Solid structures with bioorganic films on silicon

    Science.gov (United States)

    Tutov, E. A.

    2012-06-01

    The electrophysical parameters of ovalbumin/silicon and propolis/silicon heterostructures are studied using impedance spectroscopy and high-frequency capacitance-voltage characteristics under water vapor sorption conditions.

  3. Quantitation of Staphylococcus aureus in seawater using CHROMagar SA.

    Science.gov (United States)

    Tice, Alan D; Pombo, David; Hui, Jennifer; Kurano, Michelle; Bankowski, Matthew J; Seifried, Steven E

    2010-01-01

    A microbiological algorithm has been developed to analyze beach water samples for the determination of viable colony forming units (CFU) of Staphylococcus aureus (S. aureus). Membrane filtration enumeration of S. aureus from recreational beach waters using the chromogenic media CHROMagar SA alone yields a positive predictive value (PPV) of 70%. Presumptive CHROMagar SA colonies were confirmed as S. aureus by 24-hour tube coagulase test. Combined, these two tests yield a PPV of 100%. This algorithm enables accurate quantitation of S. aureus in seawater in 72 hours and could support risk-prediction processes for recreational waters. A more rapid protocol, utilizing a 4-hour tube coagulase confirmatory test, enables a 48-hour turnaround time with a modest false negative rate of less than 10%.

  4. Andragogia na saúde: estudo bibliométrico

    OpenAIRE

    Draganov, Patrícia Bover [UNIFESP; Friedländer,Maria Romana; Sanna, Maria Cristina [UNIFESP

    2011-01-01

    O sucesso da aprendizagem envolve o uso de estratégias adequadas. Como a clientela de formação profissional e de educação permanente e a população assistida, para quem se dirigem as ações de educação em saúde, são majoritariamente adultas, metodologias como a Andragogia, que é a arte e ciência de conduzir adultos ao aprendizado, são uma alternativa interessante. Com o objetivo de quantificar e descrever a produção científica sobre Andragogia nas Ciências da Saúde no período de 1999 a 2009, re...

  5. Vibration analysis of the SA349/2 helicopter

    Science.gov (United States)

    Heffernan, Ruth; Precetti, Dominique; Johnson, Wayne

    1991-01-01

    Helicopter airframe vibration is examined using calculations and measurements for the SA349/2 research helicopter. The hub loads, which transmit excitations to the fuselage, are predicted using a comprehensive rotorcraft analysis and correlated with measuring hub loads. The predicted and measured hub loads are then coupled with finite element models representing the SA349/2 fuselage. The resulting vertical acceleration at the pilot seat is examined. Adjustments are made to the airframe structural models to examine the sensitivity of predicted vertical acceleration to the model. Changes of a few percent to the damping and frequency of specific models lead to large reductions in predicted vibration, and to major improvements in the correlations with measured pilot-seat vertical acceleration.

  6. Analysis and correlation of SA349/2 helicopter vibration

    Science.gov (United States)

    Heffernan, Ruth; Precetti, Dominique; Johnson, Wayne

    1991-01-01

    Helicopter airframe vibration is examined using calculation and measurements for the SA349/2 research helicopter. The hub loads, which transmit excitation to the fuselage, are predicted using a comprehensive rotorcraft analysis and correlated with measured hub loads. The predicted and measured hub loads are then coupled with finite element models representing the SA349/2 fuselage. The resulting vertical acceleration at the pilot seat is examined. Adjustments are made to the airframe structural models to examine the sensitivity of predicted vertical acceleration to the model. Changes of a few percent to the damping and frequency of specific modes lead to large reductions in predicted vibration and to major improvements in the correlations with measured pilot seat vertical acceleration.

  7. A silicon tracker for Christmas

    CERN Multimedia

    2008-01-01

    The CMS experiment installed the world’s largest silicon tracker just before Christmas. Marcello Mannelli: physicist and deputy CMS project leader, and Alan Honma, physicist, compare two generations of tracker: OPAL for the LEP (at the front) and CMS for the LHC (behind). There is quite a difference between 1m2 and 205m2.. CMS received an early Christmas present on 18 December when the silicon tracker was installed in the heart of the CMS magnet. The CMS tracker team couldn’t have hoped for a better present. Carefully wrapped in shiny plastic, the world’s largest silicon tracker arrived at Cessy ready for installation inside the CMS magnet on 18 December. This rounded off the year for CMS with a major event, the crowning touch to ten years of work on the project by over five hundred scientists and engineers. "Building a scientific instrument of this size and complexity is a huge technical a...

  8. Tunneling magnetoresistance of silicon chains

    Science.gov (United States)

    Matsuura, Yukihito

    2016-05-01

    The tunneling magnetoresistance (TMR) of a silicon chain sandwiched between nickel electrodes was examined by using first-principles density functional theory. The relative orientation of the magnetization in a parallel-alignment (PA) configuration of two nickel electrodes enhanced the current with a bias less than 0.4 V compared with that in an antiparallel-alignment configuration. Consequently, the silicon chain-nickel electrodes yielded good TMR characteristics. In addition, there was polarized spin current in the PA configuration. The spin polarization of sulfur atoms functioning as a linking bridge between the chain and nickel electrode played an important role in the magnetic effects of the electric current. Moreover, the hybridization of the sulfur 3p orbital and σ-conjugated silicon 3p orbital contributed to increasing the total current.

  9. Belle II Silicon Vertex Detector

    CERN Document Server

    Mohanty, Gagan B

    2015-01-01

    The Belle II experiment at the SuperKEKB collider in Japan is designed to indirectly probe new physics using approximately 50 times the data recorded by its predecessor. An accurate determination of the decay-point position of subatomic particles such as beauty and charm hadrons as well as a precise measurement of low-momentum charged particles will play a key role in this pursuit. These will be accomplished by a vertex detector, which comprises two layers of pixelated silicon detector and four layers of silicon vertex detector. We describe herein the design, prototyping and construction efforts of the Belle-II silicon vertex detector that is aimed to be commissioned towards the middle of 2017.

  10. Birefringence Measurements on Crystalline Silicon

    CERN Document Server

    Krüger, Christoph; Khalaidovski, Alexander; Steinlechner, Jessica; Nawrodt, Ronny; Schnabel, Roman; Lück, Harald

    2015-01-01

    Crystalline silicon has been proposed as a new test mass material in third generation gravitational wave detectors such as the Einstein Telescope (ET). Birefringence can reduce the interferometric contrast and can produce dynamical disturbances in interferometers. In this work we use the method of polarisation-dependent resonance frequency analysis of Fabry-Perot-cavities containing silicon as a birefringent medium. Our measurements show a birefringence of silicon along the (111) axis of the order of $\\Delta\\, n \\approx 10^{-7}$ at a laser wavelength of 1550nm and room temperature. A model is presented that explains the results of different settings of our measurements as a superposition of elastic strains caused by external stresses in the sample and plastic strains possibly generated during the production process. An application of our theory on the proposed ET test mass geometry suggests no critical effect on birefringence due to elastic strains.

  11. Belle II silicon vertex detector

    Science.gov (United States)

    Adamczyk, K.; Aihara, H.; Angelini, C.; Aziz, T.; Babu, V.; Bacher, S.; Bahinipati, S.; Barberio, E.; Baroncelli, Ti.; Baroncelli, To.; Basith, A. K.; Batignani, G.; Bauer, A.; Behera, P. K.; Bergauer, T.; Bettarini, S.; Bhuyan, B.; Bilka, T.; Bosi, F.; Bosisio, L.; Bozek, A.; Buchsteiner, F.; Casarosa, G.; Ceccanti, M.; Červenkov, D.; Chendvankar, S. R.; Dash, N.; Divekar, S. T.; Doležal, Z.; Dutta, D.; Enami, K.; Forti, F.; Friedl, M.; Hara, K.; Higuchi, T.; Horiguchi, T.; Irmler, C.; Ishikawa, A.; Jeon, H. B.; Joo, C. W.; Kandra, J.; Kang, K. H.; Kato, E.; Kawasaki, T.; Kodyš, P.; Kohriki, T.; Koike, S.; Kolwalkar, M. M.; Kvasnička, P.; Lanceri, L.; Lettenbicher, J.; Maki, M.; Mammini, P.; Mayekar, S. N.; Mohanty, G. B.; Mohanty, S.; Morii, T.; Nakamura, K. R.; Natkaniec, Z.; Negishi, K.; Nisar, N. K.; Onuki, Y.; Ostrowicz, W.; Paladino, A.; Paoloni, E.; Park, H.; Pilo, F.; Profeti, A.; Rashevskaya, I.; Rao, K. K.; Rizzo, G.; Rozanska, M.; Sandilya, S.; Sasaki, J.; Sato, N.; Schultschik, S.; Schwanda, C.; Seino, Y.; Shimizu, N.; Stypula, J.; Suzuki, J.; Tanaka, S.; Tanida, K.; Taylor, G. N.; Thalmeier, R.; Thomas, R.; Tsuboyama, T.; Uozumi, S.; Urquijo, P.; Vitale, L.; Volpi, M.; Watanuki, S.; Watson, I. J.; Webb, J.; Wiechczynski, J.; Williams, S.; Würkner, B.; Yamamoto, H.; Yin, H.; Yoshinobu, T.

    2016-09-01

    The Belle II experiment at the SuperKEKB collider in Japan is designed to indirectly probe new physics using approximately 50 times the data recorded by its predecessor. An accurate determination of the decay-point position of subatomic particles such as beauty and charm hadrons as well as a precise measurement of low-momentum charged particles will play a key role in this pursuit. These will be accomplished by an inner tracking device comprising two layers of pixelated silicon detector and four layers of silicon vertex detector based on double-sided microstrip sensors. We describe herein the design, prototyping and construction efforts of the Belle-II silicon vertex detector.

  12. Belle II silicon vertex detector

    Energy Technology Data Exchange (ETDEWEB)

    Adamczyk, K. [H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342 (Poland); Aihara, H. [Department of Physics, University of Tokyo, Tokyo 113-0033 (Japan); Angelini, C. [Dipartimento di Fisica, Università di Pisa, I-56127 Pisa (Italy); INFN Sezione di Pisa, I-56127 Pisa (Italy); Aziz, T.; Babu, V. [Tata Institute of Fundamental Research, Mumbai 400005 (India); Bacher, S. [H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342 (Poland); Bahinipati, S. [Indian Institute of Technology Bhubaneswar, Satya Nagar (India); Barberio, E.; Baroncelli, Ti.; Baroncelli, To. [School of Physics, University of Melbourne, Melbourne, Victoria 3010 (Australia); Basith, A.K. [Indian Institute of Technology Madras, Chennai 600036 (India); Batignani, G. [Dipartimento di Fisica, Università di Pisa, I-56127 Pisa (Italy); INFN Sezione di Pisa, I-56127 Pisa (Italy); Bauer, A. [Institute of High Energy Physics, Austrian Academy of Sciences, 1050 Vienna (Austria); Behera, P.K. [Indian Institute of Technology Madras, Chennai 600036 (India); Bergauer, T. [Institute of High Energy Physics, Austrian Academy of Sciences, 1050 Vienna (Austria); Bettarini, S. [Dipartimento di Fisica, Università di Pisa, I-56127 Pisa (Italy); INFN Sezione di Pisa, I-56127 Pisa (Italy); Bhuyan, B. [Indian Institute of Technology Guwahati, Assam 781039 (India); Bilka, T. [Faculty of Mathematics and Physics, Charles University, 121 16 Prague (Czech Republic); Bosi, F. [INFN Sezione di Pisa, I-56127 Pisa (Italy); Bosisio, L. [Dipartimento di Fisica, Università di Trieste, I-34127 Trieste (Italy); INFN Sezione di Trieste, I-34127 Trieste (Italy); and others

    2016-09-21

    The Belle II experiment at the SuperKEKB collider in Japan is designed to indirectly probe new physics using approximately 50 times the data recorded by its predecessor. An accurate determination of the decay-point position of subatomic particles such as beauty and charm hadrons as well as a precise measurement of low-momentum charged particles will play a key role in this pursuit. These will be accomplished by an inner tracking device comprising two layers of pixelated silicon detector and four layers of silicon vertex detector based on double-sided microstrip sensors. We describe herein the design, prototyping and construction efforts of the Belle-II silicon vertex detector.

  13. SILICON REFINING BY VACUUM TREATMENT

    Directory of Open Access Journals (Sweden)

    André Alexandrino Lotto

    2014-12-01

    Full Text Available This work aims to investigate the phosphorus removal by vacuum from metallurgical grade silicon (MGSi (98.5% to 99% Si. Melting experiments were carried out in a vacuum induction furnace, varying parameters such as temperature, time and relation area exposed to the vacuum / volume of molten silicon. The results of chemical analysis were obtained by inductively coupled plasma (ICP, and evaluated based on thermodynamic and kinetic aspects of the reaction of vaporization of the phosphorus in the silicon. The phosphorus was decreased from 33 to approximately 1.5 ppm after three hours of vacuum treatment, concluding that the evaporation step is the controlling step of the process for parameters of temperature, pressure and agitation used and refining by this process is technically feasible.

  14. Improved photoluminescence of silicon nanocrystals in silicon nitride prepared by ammonia sputtering

    Energy Technology Data Exchange (ETDEWEB)

    Ma, K; Feng, J Y; Zhang, Z J [Department of Materials Science and Engineering, Key Laboratory of Advanced Materials, Tsinghua University, Beijing 100084 (China)

    2006-09-28

    In the present work we investigated the photoluminescence property of silicon nanocrystals in silicon nitride prepared by ammonia sputtering. Silicon nanocrystals were demonstrated to form even after thermal annealing at 700 deg. C. Compared with the control sample using N{sub 2} as the reactive gas, the luminescence intensity of silicon nanocrystals in silicon nitride prepared by NH{sub 3} sputtering was greatly increased. The improvement in photoluminescence was attributed to the introduction of hydrogen-related bonds, which could well passivate the nonradiative defects existing at the interface between silicon nanocrystals and the silicon nitride matrix.

  15. 360-nm Photoluminescence from Silicon Oxide Films Embedded with Silicon Nanocrystals

    Institute of Scientific and Technical Information of China (English)

    YANG Lin-lin; GUO Heng-qun; ZENG You-hua; WANG Qi-ming

    2006-01-01

    Si-rich silicon oxide films were deposited by RF magnetron sputtering onto composite Si/SiO2 targets. After annealed at different temperature, the silicon oxide films embedded with silicon nanocrystals were obtained. The photoluminescence(PL) from the silicon oxide films embedded with silicon nanocrystals was observed at room temperature. The strong peak is at 360nm, its position is independent of the annealing temperature. The origin of the 360-nm PL in the silicon oxide films embedded with silicon nanocrystals was discussed.

  16. Performance of Honeywell silicon pressure transducers

    Digital Repository Service at National Institute of Oceanography (India)

    VijayKumar, K.; Joseph, A.; Desai, R.G.P.; Nagvekar, S.; Prabhudesai, S.; Damodaran, V.

    strain gauge, semiconductor strain gauge, and quartz crystal beam. In this paper we examine the laboratory performance of a few temperature-compensated Honeywell silicon strain gauge pressure transducers based on their static calibration. 2. Silicon... Thin-Diaphragm Strain Gauge Pressure Transducer Although semiconductor materials such as germanium and silicon exhibit substantial temperature-dependence, they possess pressure-sensitivities several times that of metallic strain gauges. Silicon...

  17. Automatic Replenishment Of Dopant In Silicon Growth

    Science.gov (United States)

    Kochka, E. L.

    1988-01-01

    Dopant incorporated feed pellets to maintain required concentration. Technique of continuous replenishment of dopant in silicon melt helps ensure correct resistivity in solid silicon grown from melt. Technique used in dendritic-web growth process in which ribbon of silicon continously pulled from molten material. Providing uniform doping and resistivity in ribbon technique enables production of high-quality silicon ribbon at high yields for use in semiconductor devices.

  18. Silicon nanocrystal inks, films, and methods

    Energy Technology Data Exchange (ETDEWEB)

    Wheeler, Lance Michael; Kortshagen, Uwe Richard

    2015-09-01

    Silicon nanocrystal inks and films, and methods of making and using silicon nanocrystal inks and films, are disclosed herein. In certain embodiments the nanocrystal inks and films include halide-terminated (e.g., chloride-terminated) and/or halide and hydrogen-terminated nanocrystals of silicon or alloys thereof. Silicon nanocrystal inks and films can be used, for example, to prepare semiconductor devices.

  19. Hybrid silicon evanescent approach to optical interconnects

    OpenAIRE

    Liang, Di; Fang, Alexander W.; Chen, Hui-Wen; Sysak, Matthew N; Koch, Brian R.; Lively, Erica; Raday, Omri; Kuo, Ying-hao; Jones, Richard; Bowers, John E

    2009-01-01

    We discuss the recently developed hybrid silicon evanescent platform (HSEP), and its application as a promising candidate for optical interconnects in silicon. A number of key discrete components and a wafer-scale integration process are reviewed. The motivation behind this work is to realize silicon-based photonic integrated circuits possessing unique advantages of III–V materials and silicon-on-insulator waveguides simultaneously through a complementary metal-oxide semiconductor fabrication...

  20. Silicon Photonics Cloud (SiCloud)

    DEFF Research Database (Denmark)

    DeVore, P. T. S.; Jiang, Y.; Lynch, M.;

    2015-01-01

    Silicon Photonics Cloud (SiCloud.org) is the first silicon photonics interactive web tool. Here we report new features of this tool including mode propagation parameters and mode distribution galleries for user specified waveguide dimensions and wavelengths.......Silicon Photonics Cloud (SiCloud.org) is the first silicon photonics interactive web tool. Here we report new features of this tool including mode propagation parameters and mode distribution galleries for user specified waveguide dimensions and wavelengths....

  1. Semiconducting silicon nanowires for biomedical applications

    CERN Document Server

    Coffer, JL

    2014-01-01

    Biomedical applications have benefited greatly from the increasing interest and research into semiconducting silicon nanowires. Semiconducting Silicon Nanowires for Biomedical Applications reviews the fabrication, properties, and applications of this emerging material. The book begins by reviewing the basics, as well as the growth, characterization, biocompatibility, and surface modification, of semiconducting silicon nanowires. It goes on to focus on silicon nanowires for tissue engineering and delivery applications, including cellular binding and internalization, orthopedic tissue scaffol

  2. Eventos de massa, desastres e Saúde Pública

    Directory of Open Access Journals (Sweden)

    Camilla Figueiredo de Castro

    2014-09-01

    Full Text Available O Brasil tem sediado eventos de massa (EM e seus participantes estão sujeitos a riscos à saúde. Objetivou-se sistematizar as principais relações, de interesse da Saúde Pública, entre eventos de massa e ocorrência de desastres. Foram realizadas três estratégias metodológicas: revisão da literatura de EM, com busca sistemática, sistematização das principais informações sobre EM e seleção e sistematização das Referências que tratavam do tema desastre em suas palavras-chave, título ou Resumo. Foram selecionadas 28 Referências sobre EM, a maioria artigo científico, revisão de literatura, de 2012 e de natureza esportiva. Os principais assuntos abordados foram sistemas de vigilância e planejamento dos EM. Evidenciou-se a pouca informação analítica sobre os EM, bem como a importância de eventos não transmissíveis para a ocorrência de desastres, com destaque aos relacionados à multidão. O risco de desastres deve ser considerado no planejamento dos EM, para aumentar a capacidade de resposta considerando áreas estratégicas como: emergência médica, vigilância de doenças transmissíveis e vetores, segurança alimentar e dos serviços de saúde, saúde ambiental e laboratório. Ressalta-se a importância de pesquisas analíticas e de registro das experiências relacionadas aos EM, para a redução de risco de desastres.

  3. Genome sequencing and annotation of Morganella sp. SA36

    Directory of Open Access Journals (Sweden)

    Samy Selim

    2015-12-01

    Full Text Available We report draft genome sequence of Morganella sp. Strain SA36, isolated from water spring in Aljouf region, Saudi Arabia. The draft genome size is 2,564,439 bp with a G + C content of 51.1% and contains 6 rRNA sequence (single copies of 5S, 16S & 23S rRNA. The genome sequence can be accessed at DDBJ/EMBL/GenBank under the accession no. LDNQ00000000.

  4. Gripe Suína: Saúde em destaque

    Directory of Open Access Journals (Sweden)

    HELOÍZA FELTRIN BANDEIRA

    2009-05-01

    Full Text Available

    O texto tem por objetivo analisar alguns

    fatos ligados à crise mundial na saúde causada pelo

    virus da Influenza A.

  5. A narrativa nas pesquisas qualitativas em saúde

    Directory of Open Access Journals (Sweden)

    Marcelo Eduardo Pfeiffer Castellanos

    2014-04-01

    Full Text Available O forte interesse das ciências sociais e humanas em saúde nos estudos narrativos levou a várias formas de incorporação das contribuições desses estudos na pesquisa qualitativa em saúde. Torna-se importante refletir sobre os contextos e as características dessa incorporação. Para tanto, destacamos as principais questões teóricas aí envolvidas, assim como situamos essa incorporação no contexto da produção científica mais ampla das ciências sociais e humanas em saúde. Apontamos, também, a contribuição dos estudos narrativos para reflexão sobre as relações entre estrutura e ação social ou entre contextos específicos de interação social e contextos societários mais amplos. Essa contribuição pode ser identificada na análise das relações narrativamente estabelecidas entre interpretação, experiência e ação, ao longo do processo de saúde-doença-cuidado. Argumenta-se que as narrativas não somente organizam interpretações, mas também consistem em uma forma específica de agenciamento social. Nesse sentido, as interpretações narrativas e as performances narrativas podem ser vistas como elementos centrais da construção social de experiências e trajetórias de adoecimento e cuidado.

  6. Using SA508/533 for the HTGR Vessel Material

    Energy Technology Data Exchange (ETDEWEB)

    Larry Demick

    2012-06-01

    This paper examines the influence of High Temperature Gas-cooled Reactor (HTGR) module power rating and normal operating temperatures on the use of SA508/533 material for the HTGR vessel system with emphasis on the calculated times at elevated temperatures approaching or exceeding ASME Code Service Limits (Levels B&C) to which the reactor pressure vessel could be exposed during postulated pressurized and depressurized conduction cooldown events over its design lifetime.

  7. Epitaxial Growth of High-Quality Silicon Films on Double-Layer Porous Silicon

    Institute of Scientific and Technical Information of China (English)

    黄宜平; 竺士炀; 李爱珍; 王瑾; 黄靖云; 叶志镇

    2001-01-01

    The epitaxial growth of a high-quality silicon layer on double-layer porous silicon by ultra-high vacuum/chemical vapour deposition has been reported. The two-step anodization process results in a double-layer porous silicon structure with a different porosity. This double-layer porous silicon structure and an extended low-temperature annealing in a vacuum system was found to be helpful in subsequent silicon epitaxial growth. X-ray diffraction,cross-sectional transmission electron microscopy and spreading resistance testing were used in this work to study the properties of epitaxial silicon layers grown on the double-layer porous silicon. The results show that the epitaxial silicon layer is of good crystallinity and the same orientation with the silicon substrate and the porous silicon layer.

  8. Laser wafering for silicon solar.

    Energy Technology Data Exchange (ETDEWEB)

    Friedmann, Thomas Aquinas; Sweatt, William C.; Jared, Bradley Howell

    2011-03-01

    Current technology cuts solar Si wafers by a wire saw process, resulting in 50% 'kerf' loss when machining silicon from a boule or brick into a wafer. We want to develop a kerf-free laser wafering technology that promises to eliminate such wasteful wire saw processes and achieve up to a ten-fold decrease in the g/W{sub p} (grams/peak watt) polysilicon usage from the starting polysilicon material. Compared to today's technology, this will also reduce costs ({approx}20%), embodied energy, and green-house gas GHG emissions ({approx}50%). We will use short pulse laser illumination sharply focused by a solid immersion lens to produce subsurface damage in silicon such that wafers can be mechanically cleaved from a boule or brick. For this concept to succeed, we will need to develop optics, lasers, cleaving, and high throughput processing technologies capable of producing wafers with thicknesses < 50 {micro}m with high throughput (< 10 sec./wafer). Wafer thickness scaling is the 'Moore's Law' of silicon solar. Our concept will allow solar manufacturers to skip entire generations of scaling and achieve grid parity with commercial electricity rates. Yet, this idea is largely untested and a simple demonstration is needed to provide credibility for a larger scale research and development program. The purpose of this project is to lay the groundwork to demonstrate the feasibility of laser wafering. First, to design and procure on optic train suitable for producing subsurface damage in silicon with the required damage and stress profile to promote lateral cleavage of silicon. Second, to use an existing laser to produce subsurface damage in silicon, and third, to characterize the damage using scanning electron microscopy and confocal Raman spectroscopy mapping.

  9. Structural analysis of the JT-60SA cryostat vessel body

    Energy Technology Data Exchange (ETDEWEB)

    Botija, José, E-mail: jose.botija@ciemat.es [Association EURATOM – CIEMAT, Avda. Complutense 40, 28040 Madrid (Spain); Alonso, Javier; Fernández, Pilar; Medrano, Mercedes; Ramos, Francisco; Rincon, Esther; Soleto, Alfonso [Association EURATOM – CIEMAT, Avda. Complutense 40, 28040 Madrid (Spain); Davis, Sam; Di Pietro, Enrico; Tomarchio, Valerio [Fusion for Energy, JT-60SA European Home Team, 85748 Garching bei Munchen (Germany); Masaki, Kei; Sakasai, Akira; Shibama, Yusuke [JAEA – Japan Atomic Energy Agency, Naka Fusion Institute, Ibaraki 311-0193 (Japan)

    2013-10-15

    Highlights: ► Structural analysis to validate the JT-60SA cryostat vessel body design. ► Design code ASME 2007 “Boiler and Pressure Vessel Code. Section VIII”. ► First buckling mode: load multiplier of 10.644, higher than the minimum factor 4.7. ► Elastic and elastic–plastic stress analysis meets ASME against plastic collapse. ► Bolted fasteners have been analyzed showing small gaps closed by strong welding. -- Abstract: The JT-60SA cryostat is a stainless steel vacuum vessel (14 m diameter, 16 m height) which encloses the Tokamak providing the vacuum environment (10{sup −3} Pa) necessary to limit the transmission of thermal loads to the components at cryogenic temperature. It must withstand both external atmospheric pressure during normal operation and internal overpressure in case of an accident. The paper summarizes the structural analyses performed in order to validate the JT-60SA cryostat vessel body design. It comprises several analyses: a buckling analysis to demonstrate stability under the external pressure; an elastic and an elastic–plastic stress analysis according to ASME VIII rules, to evaluate resistance to plastic collapse including localized stress concentrations; and, finally, a detailed analysis with bolted fasteners in order to evaluate the behavior of the flanges, assuring the integrity of the vacuum sealing welds of the cryostat vessel body.

  10. Performance verification tests of JT-60SA CS model coil

    Energy Technology Data Exchange (ETDEWEB)

    Obana, Tetsuhiro, E-mail: obana.tetsuhiro@LHD.nifs.ac.jp [National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan); Murakami, Haruyuki [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan); Takahata, Kazuya; Hamaguchi, Shinji; Chikaraishi, Hirotaka; Mito, Toshiyuki; Imagawa, Shinsaku [National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan); Kizu, Kaname; Natsume, Kyohei; Yoshida, Kiyoshi [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan)

    2015-11-15

    Highlights: • The performance of the JT-60SA CS model coil was verified. • The CS model coil comprised a quad-pancake wound with a Nb{sub 3}Sn CIC conductor. • The CS model coil met the design requirements. - Abstract: As a final check of the coil manufacturing method of the JT-60 Super Advanced (JT-60SA) central solenoid (CS), we verified the performance of a CS model coil. The model coil comprised a quad-pancake wound with a Nb{sub 3}Sn cable-in-conduit conductor. Measurements of the critical current, joint resistance, pressure drop, and magnetic field were conducted in the verification tests. In the critical-current measurement, the critical current of the model coil coincided with the estimation derived from a strain of −0.62% for the Nb{sub 3}Sn strands. As a result, critical-current degradation caused by the coil manufacturing process was not observed. The results of the performance verification tests indicate that the model coil met the design requirements. Consequently, the manufacturing process of the JT-60SA CS was established.

  11. Cuidados paliativos: o desafio das equipes de saúde

    Directory of Open Access Journals (Sweden)

    Fernanda de Carvalho Braga

    2013-12-01

    Full Text Available O avanço tecnológico possibilitou tanto a redução da morte quanto o prolongamento da vida. Essa última traz consigo a necessidade de se pensar em como cuidar de pessoas fora de perspectiva de cura, especialmente porque tal cuidado inclui aspectos psicossociais, com implicações tanto para as relações entre os profissionais quanto com o paciente e sua família. Este estudo teve como objetivo buscar na literatura nacional artigos sobre equipes de saúde que oferecem cuidados paliativos. Realizou-se uma revisão de produção em periódicos nacionais com os descritores cuidados paliativos, equipe de saúde e neonatologia. Foram identificados 62 trabalhos, porém somente 11 atenderam ao critério de relacionar pelo menos dois descritores. Nenhum artigo relacionou as três palavras-chaves. O baixo número de publicações evidencia a necessidade de mais pesquisas nessa área, pois proporcionar qualidade de vida desde o diagnóstico da doença até o momento do óbito representa grande estresse para os profissionais de saúde.

  12. Saúde, este obscuro objeto de desejo

    Directory of Open Access Journals (Sweden)

    Fernando Lefèvre

    1997-07-01

    Full Text Available Exploram-se no presente ensaio as relações entre saúde e desejo, envolvendo um dado querer denominado "saúde" e as formas que este querer adquire no contexto do viver contemporâneo. Aponta-se ao final para uma situação radical no que toca à saúde, vítima de um processo irreversível de expansão, que acaba por inviabilizar qualquer tentativa de defini-la, levando a uma perda total de sentido, no contexto de um universo humano tentendo à completa robotização.The present essay explores the relations between health and desire involving a given yearning named "health" and the forms that such feeling acquires in the contemporaneous context of living. It ultimately points to a radical situation in terms of health, victim of a irreversible process of expansion that eventually makes any attempt of definition not viable, leading to a total loss of meaning within a human universe tending to complete robotization.

  13. O impacto da homofobia na saúde do adolescente

    Directory of Open Access Journals (Sweden)

    Taison Regis Penariol Natarelli

    2015-12-01

    Full Text Available Resumo Objetivo: Objetivou-se conhecer os tipos de violência sofrida por adolescentes homossexuais e compreender a influência da homofobia na saúde dessa população. Métodos: Foram realizadas entrevistas, em profundidade, com nove adolescentes residentes em um município do interior de São Paulo que se autodeclararam homossexuais. Resultados: Os tipos de violência sofridos e referidos pelos adolescentes foram: física, verbal, psicológica e sexual. A homofobia provoca percepções negativas sobre si mesmo e a não adoção de hábitos de vida saudáveis relacionados aos cuidados com alimentação, prática de atividades físicas, padrão de sono e ideações suicidas. Foram relatadas situações de homofobia nos serviços de saúde. Conclusão: Adolescentes homossexuais são vulneráveis a diferentes tipos de violência. A dificuldade de acesso aos serviços de saúde é um fator concorrente ao aumento da vulnerabilidade. A contribuição deste estudo reside na problematização de tópicos que podem auxiliar na construção do cuidado integral dos adolescentes homossexuais.

  14. Large volume cryogenic silicon detectors

    Energy Technology Data Exchange (ETDEWEB)

    Braggio, C. [Dipartimento di Fisica, Universita di Padova, via Marzolo 8, 35131 Padova (Italy); Boscardin, M. [Fondazione Bruno Kessler (FBK), via Sommarive 18, I-38100 Povo (Italy); Bressi, G. [INFN sez. di Pavia, via Bassi 6, 27100 Pavia (Italy); Carugno, G.; Corti, D. [INFN sez. di Padova, via Marzolo 8, 35131 Padova (Italy); Galeazzi, G. [INFN lab. naz. Legnaro, viale dell' Universita 2, 35020 Legnaro (Italy); Zorzi, N. [Fondazione Bruno Kessler (FBK), via Sommarive 18, I-38100 Povo (Italy)

    2009-12-15

    We present preliminary measurements for the development of a large volume silicon detector to detect low energy and low rate energy depositions. The tested detector is a one cm-thick silicon PIN diode with an active volume of 31 cm{sup 3}, cooled to the liquid helium temperature to obtain depletion from thermally-generated free carriers. A thorough study has been done to show that effects of charge trapping during drift disappears at a bias field value of the order of 100V/cm.

  15. Radiation damage in silicon detectors

    CERN Document Server

    Lindström, G

    2003-01-01

    Radiation damage effects in silicon detectors under severe hadron and gamma-irradiation are surveyed, focusing on bulk effects. Both macroscopic detector properties (reverse current, depletion voltage and charge collection) as also the underlying microscopic defect generation are covered. Basic results are taken from the work done in the CERN-RD48 (ROSE) collaboration updated by results of recent work. Preliminary studies on the use of dimerized float zone and Czochralski silicon as detector material show possible benefits. An essential progress in the understanding of the radiation-induced detector deterioration had recently been achieved in gamma irradiation, directly correlating defect analysis data with the macroscopic detector performance.

  16. Biocatalytic synthesis of silicone polyesters.

    Science.gov (United States)

    Frampton, Mark B; Subczynska, Izabela; Zelisko, Paul M

    2010-07-12

    The immobilized lipase B from Candida antarctica (CALB) was used to synthesize silicone polyesters. CALB routinely generated between 74-95% polytransesterification depending on the monomers that were used. Low molecular weight diols resulted in the highest rates of esterification. Rate constants were determined for the CALB catalyzed polytransesterifications at various reaction temperatures. The temperature dependence of the CALB-mediated polytransesterifications was examined. A lipase from C. rugosa was only successful in performing esterifications using carboxy-modified silicones that possessed alkyl chains greater than three methylene units between the carbonyl and the dimethylsiloxy groups. The proteases alpha-chymotrypsin and papain were not suitable enzymes for catalyzing any polytransesterification reactions.

  17. The SUPERB silicon vertex tracker

    Energy Technology Data Exchange (ETDEWEB)

    Forti, F., E-mail: Francesco.Forti@pi.infn.it [INFN-Pisa and Universita di Pisa (Italy); Avanzini, C.; Batignani, G.; Bettarini, S.; Bosi, F.; Calderini, G.; Ceccanti, M.; Cenci, R.; Cervelli, A.; Crescioli, F.; Dell' Orso, M.; Giannetti, P.; Giorgi, M.A. [INFN-Pisa and Universita di Pisa (Italy); Lusiani, A. [Scuola Normale Superiore and INFN-Pisa (Italy); Gregucci, S.; Mammini, P.; Marchiori, G.; Massa, M.; Morsani, F.; Neri, N. [INFN-Pisa and Universita di Pisa (Italy)

    2011-04-21

    The SUPERB asymmetric e{sup +}e{sup -} collider, to be built near the INFN National Frascati Laboratory in Italy, has been designed to deliver a luminosity greater than 10{sup 36} cm{sup -2} s{sup -1} with moderate beam currents, allowing precision measurements in the flavour sector sensitive to New Physics. The conceptual design of the Silicon Vertex Tracker for the SUPERB Detector is presented, based on double-sided silicon strip detectors for the outer layers, with the addition of an innermost Layer 0 close to the interaction point, with low material budget and capable of sustaining a background rate of several MHz/cm{sup 2}.

  18. Luminescence decay of porous silicon

    Science.gov (United States)

    Chen, X.; Uttamchandani, D.; Sander, D.; O'Donnell, K. P.

    1993-04-01

    The luminescence decay pattern of porous silicon samples prepared by electrochemical etching is characterised experimentally by a non-exponential profile, a strong dependence on temperature and an absence of spectral diffusion. We describe this luminescence as carrier-dopping-assisted recombination. Following the correlation function approach to non-dispersive transport developed by Scher and co-workers [Physics Today 41 (1991) 26], we suggest a simple derivation of analytical functions which accurately describes the anomalous luminescence decay of porous silicon, and show that this model includes exponential and Kohlrausch [Pogg. Ann. Phys. 119 (1863) 352] (stretched-exponential) relaxations as special cases.

  19. Silicon Geiger mode avalanche photodiodes

    Institute of Scientific and Technical Information of China (English)

    M. Mazzillo; S. Billotta; G. Bonanno; A. Campisi; L. Cosentino; P. Finocchiaro; F. Musumeci; S.Privitera; S. Tudisco; G. Condorelli; D. Sanfilippo; G. Fallica; E. Sciacca; S. Aurite; S. Lombardo; E. Rlmini; M. Belluso

    2007-01-01

    In this letter we present the results regarding the electrical and optical characterization of Geiger mode silicon avalanche photodiodes (GMAP) fabricated by silicon standard planar technology. Low dark count rates, negligible afterpulsing effects,good timing resolution and high quantum detection efficiency in all the visible range have been measured. The very good electro-optical performances of our photodiodes make them attractive for the fabrication of arrays with a large number of GMAP to be used both in the commercial and the scientific fields, as telecommunications and nuclear medical imaging.

  20. Extrinsic doping in silicon revisited

    KAUST Repository

    Schwingenschlögl, Udo

    2010-06-17

    Both n-type and p-type doping of silicon is at odds with the charge transfer predicted by Pauling electronegativities and can only be reconciled if we no longer regarding dopant species as isolated atoms but rather consider them as clusters consisting of the dopant and its four nearest neighbor silicon atoms. The process that gives rise to n-type and p-type effects is the charge redistribution that occurs between the dopant and its neighbors, as we illustrate here using electronic structure calculations. This view point is able to explain why conventional substitutional n-type doping of carbon has been so difficult.

  1. Extrinsic doping in silicon revisited

    Energy Technology Data Exchange (ETDEWEB)

    Schwingenschloegl, Udo [PSE Division, KAUST, Thuwal, Kingdom of Saudi Arabia (Saudi Arabia); Chroneos, Alexander; Grimes, Robin [Department of Materials, Imperial College London, London SW7 2BP (United Kingdom); Schuster, Cosima [Institut fuer Physik, Universitaet Augsburg, 86135 Augsburg (Germany)

    2011-07-01

    Both n-type and p-type doping of silicon is at odds with the charge transfer predicted by Pauling electronegativities and can only be reconciled if we no longer regard dopant species as isolated atoms but rather consider them as clusters consisting of the dopant and its four nearest neighbor silicon atoms. The process that gives rise to n-type and p-type effects is the charge redistribution that occurs between the dopant and its neighbors, as we illustrate here using electronic structure calculations. This view point is able to explain why conventional substitutional n-type doping of carbon has been so difficult.

  2. Microdefects in cast multicrystalline silicon

    Energy Technology Data Exchange (ETDEWEB)

    Wolf, E.; Klinger, D.; Bergmann, S. [Inst. of Crystal Growth Berlin (Germany)

    1995-08-01

    The microdefect etching behavior of cast multicrystalline BAYSIX and SILSO samples is mainly the same as that of EFG silicon, in spite of the very different growth parameters applied to these two techniques and the different carbon contents of the investigated materials. Intentional decorating of mc silicon with copper, iron and gold did not influence the results of etching and with help of infrared transmission microscopy no metal precipitates at the assumed microdefects could be established. There are many open questions concerning the origin of the assumed, not yet doubtless proved microdefects.

  3. ePIXfab - The silicon photonics platform

    NARCIS (Netherlands)

    Khanna, A.; Drissi, Y.; Dumon, P.; Baets, R.; Absil, P.; Pozo Torres, J.M.; Lo Cascio, D.M.R.; Fournier, M.; Fedeli, J.M.; Fulbert, L.; Zimmermann, L.; Tillack, B.; Aalto, T.; O'Brien, P.; Deptuck, D.; Xu, J.; Gale, D.

    2013-01-01

    ePIXfab-The European Silicon Photonics Support Center continues to provide state-of-the-art silicon photonics solutions to academia and industry for prototyping and research. ePIXfab is a consortium of EU research centers providing diverse expertise in the silicon photonics food chain, from training

  4. PECVD silicon nitride diaphragms for condenser microphones

    NARCIS (Netherlands)

    Scheeper, P.R.; Voorthuyzen, J.A.; Bergveld, P.

    1991-01-01

    The application of plasma-enhanced chemical vapour deposited (PECVD) silicon nitride as a diaphragm material for condenser microphones has been investigated. By means of adjusting the SiH4/NH3 gas-flow composition, silicon-rich silicon nitride films have been obtained with a relatively low tensile s

  5. Preventing Freezeup in Silicon Ribbon Growth

    Science.gov (United States)

    Mackintosh, B.

    1983-01-01

    Carefully-shaped heat conductor helps control thermal gradients crucial to growth of single-crystal silicon sheets for solar cells. Ends of die through which silicon sheet is drawn as ribbon from molten silicon. Profiled heat extractor prevents ribbon ends from solidifying prematurely and breaking.

  6. ePIXfab - The silicon photonics platform

    NARCIS (Netherlands)

    Khanna, A.; Drissi, Y.; Dumon, P.; Baets, R.; Absil, P.; Pozo Torres, J.M.; Lo Cascio, D.M.R.; Fournier, M.; Fedeli, J.M.; Fulbert, L.; Zimmermann, L.; Tillack, B.; Aalto, T.; O'Brien, P.; Deptuck, D.; Xu, J.; Gale, D.

    2013-01-01

    ePIXfab-The European Silicon Photonics Support Center continues to provide state-of-the-art silicon photonics solutions to academia and industry for prototyping and research. ePIXfab is a consortium of EU research centers providing diverse expertise in the silicon photonics food chain, from training

  7. 77 FR 20649 - Silicon Metal From China

    Science.gov (United States)

    2012-04-05

    ... COMMISSION Silicon Metal From China Determination On the basis of the record \\1\\ developed in the subject... order on silicon metal from China would be likely to lead to continuation or recurrence of material... Publication 4312 (March 2012), entitled Silicon Metal from China: Investigation No. 731-TA-472 (Third Review...

  8. Aquaporins Mediate Silicon Transport in Humans.

    Science.gov (United States)

    Garneau, Alexandre P; Carpentier, Gabriel A; Marcoux, Andrée-Anne; Frenette-Cotton, Rachelle; Simard, Charles F; Rémus-Borel, Wilfried; Caron, Luc; Jacob-Wagner, Mariève; Noël, Micheline; Powell, Jonathan J; Bélanger, Richard; Côté, François; Isenring, Paul

    2015-01-01

    In animals, silicon is an abundant and differentially distributed trace element that is believed to play important biological functions. One would thus expect silicon concentrations in body fluids to be regulated by silicon transporters at the surface of many cell types. Curiously, however, and even though they exist in plants and algae, no such transporters have been identified to date in vertebrates. Here, we show for the first time that the human aquaglyceroporins, i.e., AQP3, AQP7, AQP9 and AQP10 can act as silicon transporters in both Xenopus laevis oocytes and HEK-293 cells. In particular, heterologously expressed AQP7, AQP9 and AQP10 are all able to induce robust, saturable, phloretin-sensitive silicon transport activity in the range that was observed for low silicon rice 1 (lsi1), a silicon transporter in plant. Furthermore, we show that the aquaglyceroporins appear as relevant silicon permeation pathways in both mice and humans based on 1) the kinetics of substrate transport, 2) their presence in tissues where silicon is presumed to play key roles and 3) their transcriptional responses to changes in dietary silicon. Taken together, our data provide new evidence that silicon is a potentially important biological element in animals and that its body distribution is regulated. They should open up original areas of investigations aimed at deciphering the true physiological role of silicon in vertebrates.

  9. Analysis of silicon transporters in turfgrass species

    Science.gov (United States)

    Silicon is an abundant element on earth and is also known to be beneficial as an amendment in some crops such as rice. Despite its abundance in many soils, accumulation of silicon in plants is species-specific and can be widely different. It has been shown that the genes responsible for silicon upta...

  10. 21 CFR 172.480 - Silicon dioxide.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 3 2010-04-01 2009-04-01 true Silicon dioxide. 172.480 Section 172.480 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) FOOD FOR HUMAN... Agents § 172.480 Silicon dioxide. The food additive silicon dioxide may be safely used in food...

  11. 21 CFR 573.940 - Silicon dioxide.

    Science.gov (United States)

    2010-04-01

    ... 21 Food and Drugs 6 2010-04-01 2010-04-01 false Silicon dioxide. 573.940 Section 573.940 Food and Drugs FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN SERVICES (CONTINUED) ANIMAL DRUGS... Listing § 573.940 Silicon dioxide. The food additive silicon dioxide may be safely used in animal feed...

  12. Aquaporins Mediate Silicon Transport in Humans.

    Directory of Open Access Journals (Sweden)

    Alexandre P Garneau

    Full Text Available In animals, silicon is an abundant and differentially distributed trace element that is believed to play important biological functions. One would thus expect silicon concentrations in body fluids to be regulated by silicon transporters at the surface of many cell types. Curiously, however, and even though they exist in plants and algae, no such transporters have been identified to date in vertebrates. Here, we show for the first time that the human aquaglyceroporins, i.e., AQP3, AQP7, AQP9 and AQP10 can act as silicon transporters in both Xenopus laevis oocytes and HEK-293 cells. In particular, heterologously expressed AQP7, AQP9 and AQP10 are all able to induce robust, saturable, phloretin-sensitive silicon transport activity in the range that was observed for low silicon rice 1 (lsi1, a silicon transporter in plant. Furthermore, we show that the aquaglyceroporins appear as relevant silicon permeation pathways in both mice and humans based on 1 the kinetics of substrate transport, 2 their presence in tissues where silicon is presumed to play key roles and 3 their transcriptional responses to changes in dietary silicon. Taken together, our data provide new evidence that silicon is a potentially important biological element in animals and that its body distribution is regulated. They should open up original areas of investigations aimed at deciphering the true physiological role of silicon in vertebrates.

  13. 1366 Project Silicon: Reclaiming US Silicon PV Leadership

    Energy Technology Data Exchange (ETDEWEB)

    Lorenz, Adam [1366 Technologies, Bedford, MA (United States)

    2016-02-16

    1366 Technologies’ Project Silicon addresses two of the major goals of the DOE’s PV Manufacturing Initiative Part 2 program: 1) How to reclaim a strong silicon PV manufacturing presence and; 2) How to lower the levelized cost of electricity (“LCOE”) for solar to $0.05-$0.07/kWh, enabling wide-scale U.S. market adoption. To achieve these two goals, US companies must commercialize disruptive, high-value technologies that are capable of rapid scaling, defensible from foreign competition, and suited for US manufacturing. These are the aims of 1366 Technologies Direct Wafer ™ process. The research conducted during Project Silicon led to the first industrial scaling of 1366’s Direct Wafer™ process – an innovative, US-friendly (efficient, low-labor content) manufacturing process that destroys the main cost barrier limiting silicon PV cost-reductions: the 35-year-old grand challenge of making quality wafers (40% of the cost of modules) without the cost and waste of sawing. The SunPath program made it possible for 1366 Technologies to build its demonstration factory, a key and critical step in the Company’s evolution. The demonstration factory allowed 1366 to build every step of the process flow at production size, eliminating potential risk and ensuring the success of the Company’s subsequent scaling for a 1 GW factory to be constructed in Western New York in 2016 and 2017. Moreover, the commercial viability of the Direct Wafer process and its resulting wafers were established as 1366 formed key strategic partnerships, gained entry into the $8B/year multi-Si wafer market, and installed modules featuring Direct Wafer products – the veritable proving grounds for the technology. The program also contributed to the development of three Generation 3 Direct Wafer furnaces. These furnaces are the platform for copying intelligently and preparing our supply chain – large-scale expansion will not require a bigger machine but more machines. SunPath filled the

  14. DAYA SAING DAN STRATEGI PENGEMBANGAN MINYAK SAWIT DI INDONESIA

    Directory of Open Access Journals (Sweden)

    Jauhar Samudera Nayantakaningtyas

    2012-11-01

    Full Text Available ABSTRACTThe aims of this study were to analyze the competitiveness of Indonesian Crude palm oil CPO products in the international market and to analyze the strategy to improve the competitiveness of Indonesian CPO. The analysis methods used this research were descriptive qualitative methods. The tools used to analyze the competitiveness of palm oil is Revealed Comparative Advantages and Porter Diamond Theory, while the development of the strategy used to determine the SWOT method. Based on the analysis of Porter's Diamond System and revealed comparative advantages, this study concluded that the competitiveness of Indonesian CPO was pretty strong, but it still needed a strategy to strengthen its competitiveness especially on derivative products. Some of the routine strategies that need to be done every year, are the development of the CPO industry human resources through training and innovation activities, paying attention to national and international issues by improving government policies, downstream industrial development and palm oil value-added increase, enhance cooperation with manufacturers from other countries through promotions.Keywords: crude palm oil, competitiveness, strategy, analysis of porter's diamondABSTRAKTujuan penelitian ini adalah menganalisis daya saing produk Crude Palm Oil (CPO Indonesia di pasar internasional dan menganalisis strategi peningkatan daya saing CPO Indonesia. Metode pengolahan dan analisis data yang digunakan dalam penelitian ini adalah metode deskriptif kualitatif. Alat  yang digunakan untuk menganalisis daya saing minyak sawit  adalah Revealed Comparative Advantages dan Teori Berlian Porter, sedangkan untuk mengetahui strategi pengembangan digunakan metode SWOT. Hasil analisis Sistem Berlian Porter dan revealed comparative advantages disimpulkan bahwa daya saing CPO Indonesia cukup kuat, namun masih diperlukan adanya strategi untuk memperkuat terutama pada produk turunan CPO. Strategi rutin yang harus

  15. O Direito à Saúde no Sistema Prisional

    Directory of Open Access Journals (Sweden)

    Gabrielle Jacobi KOLLING

    2013-04-01

    Full Text Available O direito à saúde é objeto de constante análise e, a cada momento, visualiza-se a necessidade de enfrentar diferentes interfaces desse direito fundamental. A complexidade inerente ao sistema social, e, por conseguinte, ao da saúde também, demanda-nos romper com a classificação de cidadãos de primeira e de segunda classe; isso não é republicano, tampouco democrático. A lógica dos desumanizados e excluídos (esquecidos e negligenciados deve ser cambiada pela lógica da inclusão. A análise enfocará a saúde no sistema prisional. Para isso, é condição de possibilidade analisarmos os condicionantes de saúde e os seus efeitos no panorama prisional-sanitário brasileiro. Observaremos, ainda, as ações governamentais para efetivar o direito à saúde no sistema prisional, em especial a Política Pública de Saúde “Plano Nacional de Saúde no Sistema Penitenciário”, que se apresenta como uma tentativa concreta de romper com a negligência do Estado em relação aos integrantes do sistema prisional, aos esquecidos, aos sem voz. ABSTRACT The right to health is matter of constant analysis and, at each moment the need to challenge the different interfaces of this basic right is visible. The innate complexity of the social system and, by consequence to the health system as well, demands that we break with the concept of first and second class citizens; this is not republican or even democratic. The de-humanized and excluded logic (forgotten and neglected must be traded for the inclusion logic. The analysis will focus the prison system’s health. For this is condition of possibility to analyze the health conditions and its effects in the Brazilian prison-sanitary scope. We will also observe the government’s actions to make the right to heath effective in the prison system, in special the Public Health Policy “Nacional Health Plan in the Prison System”, which is presented as a real attempt to break with the state’s negligence

  16. Caso Ouro Fino Saúde Animal Caso Ouro Fino Saúde Animal Ouro Fino Saúde Animal case

    Directory of Open Access Journals (Sweden)

    Bernardo Hauch Ribeiro de Castro

    2012-04-01

    Full Text Available O Caso Ouro Fino Saúde Animal ilustra uma tomada de decisão, pelos executivos da empresa, sobre a entrada em um novo mercado, de vacinas para bovinos. Diante da necessidade de dar um passo maior em direção ao crescimento sustentável, a empresa não poderia deixar de entrar nesse segmento, que representava mais de metade do mercado brasileiro de produtos veterinários. No entanto, era um passo arriscado. A principal questão do caso é avaliar as alternativas de comprar vacinas de terceiros ou produzir internamente suas próprias vacinas. A empresa do caso é a Ouro Fino Saúde Animal, empresa brasileira de produtos veterinários, instalada no Estado de São Paulo, com faturamento de mais de R$ 100 milhões anuais. Os dois principais personagens deste caso são os diretores financeiro e industrial da empresa. A situação passa-se em 2005. Como instrumento de ensino, o caso foi concebido para o ensino de estratégia em cursos de pós-graduação em administração, levando os alunos a avaliar vantagens e desvantagens de cada uma das alternativas. Como objetivo secundário, o caso propicia alguns elementos para uma estimativa da viabilidade financeira da opção de implantar uma nova unidade produtiva e a possibilidade de refletir sobre uma decisão já tomada, de entrada no novo mercado. Por fim, o caso traz uma série de informações sobre o mercado brasileiro e sobre o mercado mundial de produtos veterinários. É possível, com base nestes dados, trabalhar questões ligadas à segmentação e posicionamento da empresa no setor, ficando a critério do professor este tipo de uso.El Caso Ouro Fino Saúde Animal ilustra una toma de decisiones por los ejecutivos de la empresa, a la entrada en un nuevo mercado de las vacunas para el ganado. Ante la necesidad de dar un paso importante hacia el crecimiento sostenible, Ouro Fino Saúde Animal no podía dejar de entrar, ya que representaba más de la mitad del mercado de productos veterinarios

  17. Silicon on insulator self-aligned transistors

    Science.gov (United States)

    McCarthy, Anthony M.

    2003-11-18

    A method for fabricating thin-film single-crystal silicon-on-insulator (SOI) self-aligned transistors. Standard processing of silicon substrates is used to fabricate the transistors. Physical spaces, between the source and gate, and the drain and gate, introduced by etching the polysilicon gate material, are used to provide connecting implants (bridges) which allow the transistor to perform normally. After completion of the silicon substrate processing, the silicon wafer is bonded to an insulator (glass) substrate, and the silicon substrate is removed leaving the transistors on the insulator (glass) substrate. Transistors fabricated by this method may be utilized, for example, in flat panel displays, etc.

  18. Intermediate Bandgap Solar Cells From Nanostructured Silicon

    Energy Technology Data Exchange (ETDEWEB)

    Black, Marcie [Bandgap Engineering, Lincoln, MA (United States)

    2014-10-30

    This project aimed to demonstrate increased electronic coupling in silicon nanostructures relative to bulk silicon for the purpose of making high efficiency intermediate bandgap solar cells using silicon. To this end, we formed nanowires with controlled crystallographic orientation, small diameter, <111> sidewall faceting, and passivated surfaces to modify the electronic band structure in silicon by breaking down the symmetry of the crystal lattice. We grew and tested these silicon nanowires with <110>-growth axes, which is an orientation that should produce the coupling enhancement.

  19. Method For Producing Mechanically Flexible Silicon Substrate

    KAUST Repository

    Hussain, Muhammad Mustafa

    2014-08-28

    A method for making a mechanically flexible silicon substrate is disclosed. In one embodiment, the method includes providing a silicon substrate. The method further includes forming a first etch stop layer in the silicon substrate and forming a second etch stop layer in the silicon substrate. The method also includes forming one or more trenches over the first etch stop layer and the second etch stop layer. The method further includes removing the silicon substrate between the first etch stop layer and the second etch stop layer.

  20. Transmutation doping of silicon solar cells

    Science.gov (United States)

    Wood, R. F.; Westbrook, R. D.; Young, R. T.; Cleland, J. W.

    1977-01-01

    Normal isotopic silicon contains 3.05% of Si-30 which transmutes to P-31 after thermal neutron absorption, with a half-life of 2.6 hours. This reaction is used to introduce extremely uniform concentrations of phosphorus into silicon, thus eliminating the areal and spatial inhomogeneities characteristic of chemical doping. Annealing of the lattice damage in the irradiated silicon does not alter the uniformity of dopant distribution. Transmutation doping also makes it possible to introduce phosphorus into polycrystalline silicon without segregation of the dopant at the grain boundaries. The use of neutron transmutation doped (NTD) silicon in solar cell research and development is discussed.

  1. Silicon carbide fibers and articles including same

    Energy Technology Data Exchange (ETDEWEB)

    Garnier, John E; Griffith, George W

    2015-01-27

    Methods of producing silicon carbide fibers. The method comprises reacting a continuous carbon fiber material and a silicon-containing gas in a reaction chamber at a temperature ranging from approximately 1500.degree. C. to approximately 2000.degree. C. A partial pressure of oxygen in the reaction chamber is maintained at less than approximately 1.01.times.10.sup.2 Pascal to produce continuous alpha silicon carbide fibers. Continuous alpha silicon carbide fibers and articles formed from the continuous alpha silicon carbide fibers are also disclosed.

  2. Methods for producing silicon carbide fibers

    Energy Technology Data Exchange (ETDEWEB)

    Garnier, John E.; Griffith, George W.

    2016-03-01

    Methods of producing silicon carbide fibers. The method comprises reacting a continuous carbon fiber material and a silicon-containing gas in a reaction chamber at a temperature ranging from approximately 1500.degree. C. to approximately 2000.degree. C. A partial pressure of oxygen in the reaction chamber is maintained at less than approximately 1.01.times.10.sup.2 Pascal to produce continuous alpha silicon carbide fibers. Continuous alpha silicon carbide fibers and articles formed from the continuous alpha silicon carbide fibers are also disclosed.

  3. Hybrid Integrated Platforms for Silicon Photonics

    Directory of Open Access Journals (Sweden)

    John E. Bowers

    2010-03-01

    Full Text Available A review of recent progress in hybrid integrated platforms for silicon photonics is presented. Integration of III-V semiconductors onto silicon-on-insulator substrates based on two different bonding techniques is compared, one comprising only inorganic materials, the other technique using an organic bonding agent. Issues such as bonding process and mechanism, bonding strength, uniformity, wafer surface requirement, and stress distribution are studied in detail. The application in silicon photonics to realize high-performance active and passive photonic devices on low-cost silicon wafers is discussed. Hybrid integration is believed to be a promising technology in a variety of applications of silicon photonics.

  4. The Future of Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    Joseph Leu

    2006-01-01

    @@ By the end of 1984, Silicon Valley was going through the down cycle fol lowing the PC boom. A hundred PC companies wanted just 10 percent of the market, wanting to strike it rich, as rich as the Apple IPO (Initial Public Of fering) -the Google celebrity IPO of its day.

  5. Applications of passivated silicon detectors

    Science.gov (United States)

    Kyung, Richard; Park, Chan Ho

    2012-03-01

    We can postulate that dark matter are WIMPS, more specifically, Majorana particles called neutralinos floating through space. Upon neutralino-neutralino annihilation, they create a greater burst of other particles into space: these being all kinds of particles including anti-deuterons which are the indications of the existence of dark matter. For the study of the applications of passivated silicon detectors, this paper shows following procedures in two categories. Painting on little pieces of silicon (Polyimid and Boxcar Red) :Took clean paint brush and painted on Polyimid and Boxcar red samples onto little pieces of sample silicon and dried for a certain number of hours in different conditions. Cooling test : usually done in 7 cycles, cool until usually -35 degrees or -40 degrees Celsius with thermoelectric cooler, dry out, evapate the moisture in the fume hood, take pictures with the microscope and check for irregularities every 1, 4 and 7 times. The results show us how the passivated silicon will act in the real experiment--the vacuum chamber and x-rays (from the radioactive source), and different atmospheric pressures simulate what it will be like in space.

  6. Surface property modification of silicon

    Science.gov (United States)

    Danyluk, S.

    1984-01-01

    The main emphasis of this work has been to determine the wear rate of silicon in fluid environments and the parameters that influence wear. Three tests were carried out on single crystal Czochralski silicon wafers: circular and linear multiple-scratch tests in fluids by a pyramidal diamond simulated fixed-particle abrasion; microhardness and three-point bend tests were used to determine the hardness and fracture toughness of abraded silicon and the extent of damage induced by abrasion. The wear rate of (100) and (111) n and p-type single crystal Cz silicon abraded by a pyramidal diamond in ethanol, methanol, acetone and de-ionized water was determined by measuring the cross-sectional areas of grooves of the circular and linear multiple-scratch tests. The wear rate depends on the loads on the diamond and is highest for ethanol and lowest for de-ionized water. The surface morphology of the grooves showed lateral and median cracks as well as a plastically deformed region. The hardness and fracture toughness are critical parameters that influence the wear rate. Microhardness tests were conducted to determine the hardness as influenced by fluids. Median cracks and the damage zone surrounding the indentations were also related to the fluid properties.

  7. Integrated silicon optofluidic ring resonator

    NARCIS (Netherlands)

    Testa, G.; Huang, Y.; Sarro, P.M.; Zeni, L.; Bernini, R.

    2010-01-01

    The feasibility of an integrated silicon optofluidic ring resonator is demonstrated. Liquid core antiresonant reflecting optical waveguides are used to realize a rectangular ring resonator with a multimode interference liquid core coupler between the ring and the bus waveguide. In this configuration

  8. Molecular dynamics of silicon indentation

    Energy Technology Data Exchange (ETDEWEB)

    Kallman, J.S.; Hoover, W.G.; Hoover, C.G.; De Groot, A.J.; Lee, S.M.; Wooten, F. (Department of Applied Science Davis-Livermore, Lawrence Livermore National Laboratory, Livermore, California 94550 (United States))

    1993-04-01

    We use nonequilibrium molecular dynamics to simulate the elastic-plastic deformation of silicon under tetrahedral nanometer-sized indentors. The results are described in terms of a rate-dependent and temperature-dependent phenomenological yield strength. We follow the structural change during indentation with a computer technique that allows us to model the dynamic simulation of diffraction patterns.

  9. Simulation of Silicon Photomultiplier Signals

    NARCIS (Netherlands)

    Seifert, Stefan; van Dam, Herman T.; Huizenga, Jan; Vinke, Ruud; Dendooven, Peter; Loehner, Herbert; Schaart, Dennis R.

    2009-01-01

    In a silicon photomultiplier (SiPM), also referred to as multi-pixel photon counter (MPPC), many Geiger-mode avalanche photodiodes (GM-APDs) are connected in parallel so as to combine the photon counting capabilities of each of these so-called microcells into a proportional light sensor. The

  10. Simulation of silicon photomultiplier signals

    NARCIS (Netherlands)

    Seifert, S.; Van Dam, H.T.; Huizenga, J.; Vinke, R.; Dendooven, P.; Löhner, H.; Schaart, D.R.

    2009-01-01

    In a silicon photomultiplier (SiPM), also referred to as multi-pixel photon counter (MPPC), many Geiger-mode avalanche photodiodes (GM-APDs) are connected in parallel so as to combine the photon counting capabilities of each of these so-called microcells into a proportional light sensor. The

  11. Let’s talk silicon

    Science.gov (United States)

    While silicon (Si) has been a known plant nutrient for centuries, how plants use this element is still poorly understood. Researchers have identified how plants acquire Si from the environment and transport the element to all plant tissues, including roots, stems, petioles, leaves and flowers. We ...

  12. Mesoporous Silicon-Based Anodes

    Science.gov (United States)

    Peramunage, Dharmasena

    2015-01-01

    For high-capacity, high-performance lithium-ion batteries. A new high-capacity anode composite based on mesoporous silicon is being developed. With a structure that resembles a pseudo one-dimensional phase, the active anode material will accommodate significant volume changes expected upon alloying and dealloying with lithium (Li).

  13. Behavior of dislocations in silicon

    Energy Technology Data Exchange (ETDEWEB)

    Sumino, Koji [Nippon Steel Corp., Chiba Prefecture (Japan)

    1995-08-01

    A review is given of dynamic behavior of dislocations in silicon on the basis of works of the author`s group. Topics taken up are generation, motion and multiplication of dislocations as affected by oxygen impurities and immobilization of dislocations due to impurity reaction.

  14. Electronic properties of interfaces produced by silicon wafer hydrophilic bonding

    Energy Technology Data Exchange (ETDEWEB)

    Trushin, Maxim

    2011-07-15

    The thesis presents the results of the investigations of electronic properties and defect states of dislocation networks (DNs) in silicon produced by wafers direct bonding technique. A new insight into the understanding of their very attractive properties was succeeded due to the usage of a new, recently developed silicon wafer direct bonding technique, allowing to create regular dislocation networks with predefined dislocation types and densities. Samples for the investigations were prepared by hydrophilic bonding of p-type Si (100) wafers with same small misorientation tilt angle ({proportional_to}0.5 ), but with four different twist misorientation angles Atw (being of < , 3 , 6 and 30 , respectively), thus giving rise to the different DN microstructure on every particular sample. The main experimental approach of this work was the measurements of current and capacitance of Schottky diodes prepared on the samples which contained the dislocation network at a depth that allowed one to realize all capabilities of different methods of space charge region spectroscopy (such as CV/IV, DLTS, ITS, etc.). The key tasks for the investigations were specified as the exploration of the DN-related gap states, their variations with gradually increasing twist angle Atw, investigation of the electrical field impact on the carrier emission from the dislocation-related states, as well as the establishing of the correlation between the electrical (DLTS), optical (photoluminescence PL) and structural (TEM) properties of DNs. The most important conclusions drawn from the experimental investigations and theoretical calculations can be formulated as follows: - DLTS measurements have revealed a great difference in the electronic structure of small-angle (SA) and large-angle (LA) bonded interfaces: dominating shallow level and a set of 6-7 deep levels were found in SA-samples with Atw of 1 and 3 , whereas the prevalent deep levels - in LA-samples with Atw of 6 and 30 . The critical twist

  15. OCULAR COMPLICATIONS OF SILICONE OIL

    Directory of Open Access Journals (Sweden)

    Muhammad Kamran Khalid

    2016-06-01

    Full Text Available Objective: Silicone oil (SO is an invaluable tool in the management of complex retinal detachments (RDs. Injection of silicone oil is associated with a variety of ocular complications specially when it is kept for a long time and its removal is endangering retinal re-detachment. The objective of this study was to determine the frequencies of different ocular complications associated with silicone oil injection in our setup. Study Design: Case series. Place and Duration of Study: This study was conducted at Vitreo-retina division of Al-Shifa Trust Eye Hospital, Rawalpindi from January 2014 to June 2014. Material and Methods: A total of 30 patients were included in the study who underwent pars-planavitrectomy (PPV with silicone oil injection for complex retinal detachments. The patients who had reached between 3 months & 6 months of their postoperative period and were presenting with some complications related to silicone oil injection were included in the study. Their records were reviewed and pre-operative data were collected regarding state of the eye preoperatively. Then the post-operative complications were noted. The descriptive and analytical statistics of different variables were measured using SPSS-17.0 software. Results: Out of thirty patients included in our study 23 (76.7% were male and 7 (23.3% were female. The mean age was 21.53 ± 16.004 years and range was 66 years. The mean pre-operative intra-ocular pressure ( IOP was 14.0 ± 2.150 mmHg and range 8 mmHg and the mean post-operative IOP was 24.93 ± 13.889 mmHg and range 45 mmHg (p=0.001. The pre-operative PVR grade-C was absent in 12 (40% patients and was present in 18 (60% patients and post-operative PVR grade-C was absent in 24 (80% patients and was present in 6 (20% patients (p=0.004; McNemar test. Band keratopathy was seen in 8 (26.7% and corneal decompensation in 2 (6.7% patients. Emulsification of silicone oil was seen in 14 (46.7% patients. Rubeosisiridis was present in 2

  16. Flexible Thermoelectric Generators on Silicon Fabric

    KAUST Repository

    Sevilla, Galo T.

    2012-11-01

    In this work, the development of a Thermoelectric Generator on Flexible Silicon Fabric is explored to extend silicon electronics for flexible platforms. Low cost, easily deployable plastic based flexible electronics are of great interest for smart textile, wearable electronics and many other exciting applications. However, low thermal budget processing and fundamentally limited electron mobility hinders its potential to be competitive with well established and highly developed silicon technology. The use of silicon in flexible electronics involve expensive and abrasive materials and processes. In this work, high performance flexible thermoelectric energy harvesters are demonstrated from low cost bulk silicon (100) wafers. The fabrication of the micro- harvesters was done using existing silicon processes on silicon (100) and then peeled them off from the original substrate leaving it for reuse. Peeled off silicon has 3.6% thickness of bulk silicon reducing the thermal loss significantly and generating nearly 30% more output power than unpeeled harvesters. The demonstrated generic batch processing shows a pragmatic way of peeling off a whole silicon circuitry after conventional fabrication on bulk silicon wafers for extremely deformable high performance integrated electronics. In summary, by using a novel, low cost process, this work has successfully integrated existing and highly developed fabrication techniques to introduce a flexible energy harvester for sustainable applications.

  17. Level of Need for Cognition and Metacognitive Thinking among Undergraduate Kindergarten Female Students at King Sa'ud University in Sa'udi Arabia

    Science.gov (United States)

    Daghistani, Bulquees

    2015-01-01

    This study aims at examining the level of need for cognition and metacognitive thinking among undergraduate kindergarten female students in Education Faculty at King Sa'ud University in Sa'udi Arabia from their own perceptions. Results showed that the need for the cognition level was moderate, but metacognitive thinking level was high. In…

  18. Grupo PET-Saúde/Vigilância em Saúde do Trabalhador Portuário: vivência compartilhada

    Directory of Open Access Journals (Sweden)

    Maria de Fátima Ferreira Queiróz

    2015-12-01

    Full Text Available Trata-se de um relato de vivência compartilhada do Grupo PET-Saúde/ Vigilância em Saúde do Trabalhador Portuário, da Universidade Federal de São Paulo – Unifesp e o Centro de Referência em Saúde do Trabalhador – CEREST, de Santos, SP. O objetivo é descrever a experiência desse grupo tutorial e sua contribuição para o fortalecimento de ações de vigilância em saúde do trabalhador de Santos. O trabalho portuário é a temática do PET-Saúde por sua importância no cenário nacional e por sofrer transformações que geram fatores de agravos à saúde dos trabalhadores. As ações são desenvolvidas englobando o CEREST, os serviços da rede de saúde de Santos e a comunidade portuária santista. Observa-se que os participantes têm compartilhado conhecimento teórico e prático profissional, contribuindo nas ações dos trabalhadores do CEREST e apontando na direção de aproximação com a rede básica de atenção à saúde.

  19. Level of Need for Cognition and Metacognitive Thinking among Undergraduate Kindergarten Female Students at King Sa'ud University in Sa'udi Arabia

    Science.gov (United States)

    Daghistani, Bulquees

    2015-01-01

    This study aims at examining the level of need for cognition and metacognitive thinking among undergraduate kindergarten female students in Education Faculty at King Sa'ud University in Sa'udi Arabia from their own perceptions. Results showed that the need for the cognition level was moderate, but metacognitive thinking level was high. In…

  20. Cryostable lightweight frit bonded silicon mirror

    Science.gov (United States)

    Anthony, F.; McCarter, D.; Tangedahl, M.; Content, D.

    The excellent polishability, low density and relatively high stiffness of silicon make it an attractive candidate for optical applications that require superior performance. Assembly of silicon details by means of glass frit bonding permits significant light weighting thus enhancing the benefit of silicon mirrors. To demonstrate the performance potential, a small lightweight glass frit bonded silicon mirror was fabricated and tested for cryoability. The test mirror was 12.5cm in diameter with a 60cm spherical radius and a maximum thickness, at the perimeter, of 2.5cm. A machined silicon core was used to stiffen the two face sheets of the silicon sandwich. These three elements were assembled, by glass frit bonding, to form the substrate that was polished. The experimental evaluation in a liquid nitrogen cryostat, demonstrated cryostability performance significantly better than required by the mirror specification. Key WordsCryostable, Lightweight, Silicon, Frit Bond, Spherical, Mirror

  1. Aluminum gettering in single and multicrystalline silicon

    Energy Technology Data Exchange (ETDEWEB)

    McHugo, S.A.; Hieslmair, H.; Weber, E.R. [Univ. of California, Berkeley, CA (United States)

    1995-08-01

    Al gettering has been performed on integrated circuit (I.C.) quality silicon and a variety of single and multicrystalline silicon solar cell materials. The minority carrier diffusion length, Ln, has been used to quantify the gettering response. Vast differences in response to the Al gettering treatment are observed between the I.C. quality silicon and the solar cell materials. The I.C. silicon generally responds well while the solar cell silicon performance progressively degrades with increasing gettering temperature. Preliminary data shows that by performing a Rapid Thermal Annealing treatment prior to the Al gettering, an improved or further degraded Ln emerges in solar cell material depending on the material`s manufacturer. We explain these observed phenomena by suggesting that Al gettering in solar cell silicon is an impurity emission-limited process while for I.C. quality silicon it is diffusion limited.

  2. Inert gas atomization of chemical grade silicon

    Energy Technology Data Exchange (ETDEWEB)

    Rodrigues, D.; Ferreira Neto, J.B.; Salgado, L.; Nogueira, P.F.; Poco, J.G.R. [Metallurgy Div. Cidade Univ., Inst. for Technological Research, Sao Paulo, SP (Brazil)

    2001-07-01

    The use of inert gas atomization to obtain chemical grade silicon particles was investigated. Both cooling rate and chemical composition are very important regarding a tailored microstructure, related with silicon performance during the synthesis of the silanos, an intermediary raw material in the silicone production. Previously refined silicon was used as raw material. Silicon with different aluminum contents were atomized and analyzed. The atomization temperature was set around 1520 C, and it was used a confined atomization nozzle. It was necessary to use a long atomization chamber to allow the cooling of the coarse silicon particles. After atomization, the powder was characterized and classified. The coarse fraction was milled. Two different particle size groups (different cooling rates) and the as atomized particles were investigated. The chemical behavior during the synthesis of the silanos was analyzed in a laboratory reactor. The relationship between cooling rate, aluminum content and silicon performance during the silanos synthesis is discussed. (orig.)

  3. Silicon photonics: some remaining challenges

    Science.gov (United States)

    Reed, G. T.; Topley, R.; Khokhar, A. Z.; Thompson, D. J.; Stanković, S.; Reynolds, S.; Chen, X.; Soper, N.; Mitchell, C. J.; Hu, Y.; Shen, L.; Martinez-Jimenez, G.; Healy, N.; Mailis, S.; Peacock, A. C.; Nedeljkovic, M.; Gardes, F. Y.; Soler Penades, J.; Alonso-Ramos, C.; Ortega-Monux, A.; Wanguemert-Perez, G.; Molina-Fernandez, I.; Cheben, P.; Mashanovich, G. Z.

    2016-03-01

    This paper discusses some of the remaining challenges for silicon photonics, and how we at Southampton University have approached some of them. Despite phenomenal advances in the field of Silicon Photonics, there are a number of areas that still require development. For short to medium reach applications, there is a need to improve the power consumption of photonic circuits such that inter-chip, and perhaps intra-chip applications are viable. This means that yet smaller devices are required as well as thermally stable devices, and multiple wavelength channels. In turn this demands smaller, more efficient modulators, athermal circuits, and improved wavelength division multiplexers. The debate continues as to whether on-chip lasers are necessary for all applications, but an efficient low cost laser would benefit many applications. Multi-layer photonics offers the possibility of increasing the complexity and effectiveness of a given area of chip real estate, but it is a demanding challenge. Low cost packaging (in particular, passive alignment of fibre to waveguide), and effective wafer scale testing strategies, are also essential for mass market applications. Whilst solutions to these challenges would enhance most applications, a derivative technology is emerging, that of Mid Infra-Red (MIR) silicon photonics. This field will build on existing developments, but will require key enhancements to facilitate functionality at longer wavelengths. In common with mainstream silicon photonics, significant developments have been made, but there is still much left to do. Here we summarise some of our recent work towards wafer scale testing, passive alignment, multiplexing, and MIR silicon photonics technology.

  4. Silicon-Based Anode and Method for Manufacturing the Same

    Science.gov (United States)

    Yushin, Gleb Nikolayevich (Inventor); Luzinov, Igor (Inventor); Zdyrko, Bogdan (Inventor); Magasinski, Alexandre (Inventor)

    2017-01-01

    A silicon-based anode comprising silicon, a carbon coating that coats the surface of the silicon, a polyvinyl acid that binds to at least a portion of the silicon, and vinylene carbonate that seals the interface between the silicon and the polyvinyl acid. Because of its properties, polyvinyl acid binders offer improved anode stability, tunable properties, and many other attractive attributes for silicon-based anodes, which enable the anode to withstand silicon cycles of expansion and contraction during charging and discharging.

  5. Silicon heterojunction solar cell and crystallization of amorphous silicon

    Science.gov (United States)

    Lu, Meijun

    The rapid growth of photovoltaics in the past decade brings on the soaring price and demand for crystalline silicon. Hence it becomes necessary and also profitable to develop solar cells with over 20% efficiency, using thin (˜100mum) silicon wafers. In this respect, diffused junction cells are not the best choice, since the inescapable heating in the diffusion process not only makes it hard to handle thin wafers, but also reduces carriers' bulk lifetime and impairs the crystal quality of the substrate, which could lower cell efficiency. An alternative is the heterojunction cells, such as amorphous silicon/crystalline silicon heterojunction (SHJ) solar cell, where the emitter layer can be grown at low temperature (solar cell, including the importance of intrinsic buffer layer; the discussion on the often observed anomalous "S"-shaped J-V curve (low fill factor) by using band diagram analysis; the surface passivation quality of intrinsic buffer and its relationship to the performance of front-junction SHJ cells. Although the a-Si:H is found to help to achieve high efficiency in c-Si heterojuntion solar cells, it also absorbs short wavelength (cells. Considering this, heterojunction with both a-Si:H emitter and base contact on the back side in an interdigitated pattern, i.e. interdigitated back contact silicon heterojunction (IBC-SHJ) solar cell, is developed. This dissertation will show our progress in developing IBC-SHJ solar cells, including the structure design; device fabrication and characterization; two dimensional simulation by using simulator Sentaurus Device; some special features of IBC-SHJ solar cells; and performance of IBC-SHJ cells without and with back surface buffer layers. Another trend for solar cell industry is thin film solar cells, since they use less materials resulting in lower cost. Polycrystalline silicon (poly-Si) is one promising thin-film material. It has the potential advantages to not only retain the performance and stability of c

  6. 认识SA8000更要关注ISO26000%Concerned on SA 8000, and Focused on ISO 26000 Further

    Institute of Scientific and Technical Information of China (English)

    张振明

    2006-01-01

    @@ 近年来,在我国形成来势凶猛的SA 8000运动浪潮,特别是2004年初,国内部分媒体的相关报道铺天盖地,各种收费培训班或专题讲座火爆异常,一时间人们谈及社会责任,言必称SA 8000,笔者同年6月参加在深圳举办的SA 8000专题讲座,授课人甚至称SA 8000是国际标准,似乎SA 8000就是社会责任的代名词.

  7. Colloidal Photoluminescent Amorphous Porous Silicon, Methods Of Making Colloidal Photoluminescent Amorphous Porous Silicon, And Methods Of Using Colloidal Photoluminescent Amorphous Porous Silicon

    KAUST Repository

    Chaieb, Sahraoui

    2015-04-09

    Embodiments of the present disclosure provide for a colloidal photoluminescent amorphous porous silicon particle suspension, methods of making a colloidal photoluminescent amorphous porous silicon particle suspension, methods of using a colloidal photoluminescent amorphous porous silicon particle suspension, and the like.

  8. DAYA SAING PRODUK TURUNAN SUSU INDONESIA DI PASAR DUNIA

    Directory of Open Access Journals (Sweden)

    Lina Yanti

    2012-06-01

    Full Text Available ABSTRACTThis research purposes were (1 to measures the competitiveness of Indonesian milk derivative product in international market based on its comparative advantage, (2 to analyze the dynamics of Indonesian milk and also to analyze the commodity’s competitive position in the international market through its dynamic export product performance, (3 to analyze dominant factors that influencing Indonesian dairy export growth based on constant market share analysis. The analysis methods used to measure the competitiveness of Indonesian milk in this research are based on revealed comparative advantage analysis, Export product dynamic analysis (EPD, and constant market share analysis. The result from RCA showed that the Indonesian milk derivative products which are Milk not concentrated nor sweetened 1–6% fat (HS 040120, Milk and cream, concentrated or sweetened (HS 0402 and Buttermilk, curdled milk, cream, kephir, etc (HS 040390 do not have comparative advantage but for Milk and cream powder unsweetened > 1,5%  fat (HS 040221, Milk and cream nes sweetened or concentrated (HS 040299 and Cereal, flour, starch, milk preparations and products (HS19 have comparative advantage. The EPD found that all Indonesian milk derivative products are included in the Rising Star position. The result test using CMS analysis concluded that the most significant factor which affect the export growth for Indonesian HS 040390 and HS 0402 derivative products are the import growth effect, HS 19 is mainly dominated by commodity composition effect, and the export growth for the rest derivative products are dominated with the competitiveness effect. Therefore, it needs to be implemented efforts to enhance the competitiveness of dairy derived products IndonesiaKeywords: milk, competitiveness, revealed comparative advantage (RCA, export product dynamic (EPD, constant market share analysis (CMSAABSTRAKPenelitian ini bertujuan (1 menganalisis daya saing komoditas susu

  9. Desigualdades socioeconômicas na saúde

    Directory of Open Access Journals (Sweden)

    Diaz Maria Dolores M.

    2003-01-01

    Full Text Available Este artigo analisa as desigualdades socioeconômicas na área da saúde no Brasil, por meio da mensuração de índice de concentração para a variável autoavaliação do estado de saúde. Utilizou-se a base de dados originada pela Pesquisa Domiciliar sobre Padrões de Vida - PPV - realizada pelo IBGE no período de março/1996 a março/1997, em convênio com o Banco Mundial. Entre os principais resultados, deve-se destacar a constatação de que existem diferenças estatisticamente significativas entre índices calculados a partir de distintas variáveis caracterizadoras do nível socioeconômico dos indivíduos. Neste caso, em particular, os indicadores calculados a partir da classificação baseada na variável renda indicou, sistematicamente, a presença de desigualdades na saúde ligeiramente superiores àquelas identificadas a partir da utilização das despesas familiares. Constatou-se, ainda, que os resultados obtidos são bastante robustos em relação às distintas ponderações utilizadas na construção das escalas de equivalência entre os indivíduos. Todas as simulações realizadas revelaram a presença de desigualdades que favorecem os indivíduos pertencentes às camadas mais elevadas das escalas socioeconômicas adotadas.

  10. Indutores de mudança na formação dos profissionais de saúde: pró-saúde e PET-SAÚDE

    Directory of Open Access Journals (Sweden)

    Isabel Cristina Luck Coelho de Holanda

    2012-12-01

    Full Text Available Na última década, a formação de profissionais de saúde tem sido reformulada no intuito de atender às necessidades de saúde das pessoas e não somente suas demandas. Políticas públicas de educação e saúde promovidas em parceria com o Ministério da Educação (MEC e o Ministério da Saúde (MS sinalizaram uma reforma curricular imprescindível nos cursos de graduação da área de saúde(1,2 .A formalização dessa mudança teve seu marco com a instituição das Diretrizes Curriculares Nacionais (DCN para os cursos de graduação no campo da saúde. Todos os instrumentos vigentes orientam a construção do perfil dos egressos por meio de um modelo acadêmico e profissional em que atitudes, habilidades e conteúdos almejem a formação generalista, humanista, crítica e reflexiva, com competência para a atuação em todos os níveis de atenção à saúde, embasando suas condutas nos rigores científico e ético(3-7.Não por acaso, todos os documentos ressaltam os mesmos campos de competência a serem desenvolvidos durante a formação dos diferentes profissionais da área: atenção à saúde, tomada de decisões, comunicação, liderança, educação permanente, administração e gerenciamento(3-7, pois a saúde, como um complexo campo de atuação, não consegue imprimir ações resolutivas através de uma única disciplina ou área do saber.A proposta preconizada pelo MEC e MS de produzir transformação nos processos de formação, trabalho e ampliação da cobertura dos serviços tem sido concretizada mediante programas indutores, como o Programa Nacional de Reorientação da Formação Profissional em Saúde (Pró-Saúde e o Programa de Educação pelo Trabalho para a Saúde (PET–Saúde(1,2.O Pró-Saúde, implementado no país desde 2005 através da divulgação de editais, pretende sintonizar a formação em saúde com as necessidades sociais, considerando as dimensões históricas, culturais e econômicas da população(8

  11. A review of oxide, silicon nitride, and silicon carbide brazing

    Energy Technology Data Exchange (ETDEWEB)

    Santella, M.L.; Moorhead, A.J.

    1987-01-01

    There is growing interest in using ceramics for structural applications, many of which require the fabrication of components with complicated shapes. Normal ceramic processing methods restrict the shapes into which these materials can be produced, but ceramic joining technology can be used to overcome many of these limitations, and also offers the possibility for improving the reliability of ceramic components. One method of joining ceramics is by brazing. The metallic alloys used for bonding must wet and adhere to the ceramic surfaces without excessive reaction. Alumina, partially stabilized zirconia, and silicon nitride have high ionic character to their chemical bonds and are difficult to wet. Alloys for brazing these materials must be formulated to overcome this problem. Silicon carbide, which has some metallic characteristics, reacts excessively with many alloys, and forms joints of low mechanical strength. The brazing characteristics of these three types of ceramics, and residual stresses in ceramic-to-metal joints are briefly discussed.

  12. Debug automation from pre-silicon to post-silicon

    CERN Document Server

    Dehbashi, Mehdi

    2015-01-01

    This book describes automated debugging approaches for the bugs and the faults which appear in different abstraction levels of a hardware system. The authors employ a transaction-based debug approach to systems at the transaction-level, asserting the correct relation of transactions. The automated debug approach for design bugs finds the potential fault candidates at RTL and gate-level of a circuit. Debug techniques for logic bugs and synchronization bugs are demonstrated, enabling readers to localize the most difficult bugs. Debug automation for electrical faults (delay faults)finds the potentially failing speedpaths in a circuit at gate-level. The various debug approaches described achieve high diagnosis accuracy and reduce the debugging time, shortening the IC development cycle and increasing the productivity of designers. Describes a unified framework for debug automation used at both pre-silicon and post-silicon stages; Provides approaches for debug automation of a hardware system at different levels of ...

  13. D0 Silicon Upgrad: D0 Silicon Cooling System

    Energy Technology Data Exchange (ETDEWEB)

    Squires, B.; /Fermilab

    1998-07-14

    The cooling system design is not complete. This paper lays out the general design and some of the design calculations that have been performed up to this date. Further refinement will be performed. This is especially true in the piping layout, piping insulation and detector manifold areas. The silicon detector is cooled by means of a coolant in the beryllium channels that also act as the primary supporting device for the silicon ladders and wedges. The coolant is water with ethylene glycol added as a freezing point depressant. The glycol concentration in the coolant is 30% by weight resulting in a freezing point of approximately -15 C. If the water/glycol is not sufficient for maintaining the desired detector temperature the concentration of the water/glycol may be changed or an alternative coolant may be used.

  14. SA8000基本知识解读

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    1SA8000的含义 社会责任国际标准体系(Social Accountability 8000 Intemational standard,简称SAS000)是一种基于国际劳工组织宪章(ILO宪章)、联合国儿童权利公约、世界人权宣言而制定的,以保护劳动环境和条件、劳工权利等为主要内容的管理标准体系。

  15. SA8000基础知识解读

    Institute of Scientific and Technical Information of China (English)

    黎友焕

    2004-01-01

    社会责任国际标准体系(Social Ac-countability 8000 International slandard,简称SA8000)是一种基于国际劳工组织宪章(ILO宪章),联台国儿童权利公约,世界人权宣言而制定的.以保护劳动环境和条件、劳工权利等为主要内容的管理标准体系。

  16. Programa de Monitoreo Ambiental para Cementos Cienfuegos S.A

    OpenAIRE

    Mario A. Curbelo Hernández; José Luis Romero Cabrera; Henrry Ricardo Cabrera

    2012-01-01

    La presente investigación se realizó en las instalaciones de Cementos Cienfuegos S.A. Cuba, con el objetivo de diseñar e implementar un programa de monitoreo de las variables de concentración de polvo en aire, tasa de deposición y concentración de metales pesados, para la valoración de la calidad del aire a partir de índices establecidos en la norma NC ISO 111:2004. Este programa incluye también el monitoreo de los parámetr...

  17. Composition and Value of waste in landfills in SA

    CSIR Research Space (South Africa)

    Oelofse, Suzanna HH

    2015-09-01

    Full Text Available stream_source_info Oelofse1_2015.pdf.txt stream_content_type text/plain stream_size 3221 Content-Encoding UTF-8 stream_name Oelofse1_2015.pdf.txt Content-Type text/plain; charset=UTF-8 1 Composition and Value of waste... in landfills in SA German Chamber of Business From Mining to Urban Mining 16 September 2015 IFAT Environmental Technology Forum Africa 2015 by Prof Suzan Oelofse Research Group Leader: Waste for Development Competency Area: Solutions for a Green...

  18. Caso Molinos Roa S.A.: historia empresarial

    OpenAIRE

    2013-01-01

    Durante su trayectoria empresarial Molinos Roa S.A. ha enfocado sus estrategias gerenciales al logro de objetivos basados en principios y valores corporativos, por lo anterior el documento presenta el estudio de la historia empresarial, donde se da un reflejo de la pujanza y la visión de gestores y administradores. Sin embargo se analiza el impacto que trae en el negocio de la industria arrocera la firma de los tratados de libre comercio, así como el contrabando desmedido de este cereal y el ...

  19. Impacto de ingrediente funcional sobre a saúde intestinal

    OpenAIRE

    Gabriela Santos Souza

    2014-01-01

    O microbioma intestinal influencia de maneira positiva e/ou negativa o bem estar e o equilíbrio da saúde no organismo humano. Carboidratos não disponíveis, tais como frutanos e amido resistente (encontrado na farinha de banana verde), são ingredientes funcionais que resistem à digestão, estimulam o peristaltismo e o trânsito intestinal, e podem aumentar população de bactérias benéficas. O presente estudo teve como objetivo avaliar o impacto do consumo regular e descontinuado (durante 6 semana...

  20. The rebranding of Electrica Soluziona SA - a case study

    Directory of Open Access Journals (Sweden)

    Monica GOMOESCU

    2016-07-01

    Full Text Available This article intends to present the design and implementation stages of a rebranding campaign that took place in the Electrica Soluziona SA company. The rebranding targets a company that provides consultancy services and software solutions and that underwent a change of its main shareholders structure, as it was taken over by Indra Group. After being taken over by Indra, Electrica Soluziona has considerably enlarged its product portfolio and the market segments targeted. Thus, it was mandatory to define a complex rebranding campaign. The rebranding process was not determined only by the broadening of activity, but also by the change of visual identity elements, along with the desire of repositioning.

  1. Genética, saúde e sociedade

    OpenAIRE

    2013-01-01

    O documentário apresenta quatro projetos de pesquisa realizados pelo Instituto de GenéticaMédica Populacional (INAGEMP) em diferentes regiões do país.As atividades mencionadasrepresentam uma amostra do trabalho do INAGEMP, que se estruturou de modo a colocar agenética médica populacional na prática ao associar pesquisa e atenção em saúde parapopulações afetadas por doenças com forte componente genético em sua etiologia.

  2. Significado da massagem com aromaterapia em saúde mental

    OpenAIRE

    Domingos,Thiago da Silva; Braga,Eliana Mara

    2014-01-01

    Objetivo Compreender o significado da intervenção de massagem com aromaterapia em saúde mental para o usuário durante a internação psiquiátrica.Métodos Pesquisa qualitativa que incluiu 22 participantes com diagnóstico de Transtornos de Personalidade internados em unidade psiquiátrica de um hospital geral. Foram realizadas entrevistas semiestruturadas, com uma questão norteadora aos participantes, os quais se submeteram a intervenç...

  3. A general classification of silicon utilizing organisms

    Science.gov (United States)

    Das, P.; Das, S.

    2010-12-01

    Silicon utilizing organisms may be defined as organisms with high silicon content (≥ 1% dry weight) and they can metabolize silicon with or without demonstrable silicon transporter genes (SIT) in them(Das,2010). Silicon is the second most abundant element in the lithosphere (27.70%) and it is as important as phosphorus and magnesium (0.03%) in the biota. Hydrated silica represents the second most abundant biogenic mineral after carbonate minerals. Silicon is accumulated and metabolized by some prokaryotes, and Si compounds can stimulate the growth of a range of fungi. It is well known that Si is essential for diatoms. In mammals, Si is considered an essential trace element, required in bone, cartilage and connective tissue formation, enzymatic activities and other metabolic processes. Silicon was suggested to act as a phosphoprotein effector in bone. In mammals, Si is also reported to positively influence the immune system and to be required for lymphocyte proliferation. The aqueous chemistry of Si is dominated by silicic acid at biological pH ranges. Monosilicic acid can form stable complexes with organic hydroxy-containing molecules . Biosilica also has been identified associated with various biomolecules including proteins and carbohydrates. There are main seven groups of silicon utilizing organisms belonging to Gram positive bacteria, algae, protozoa, sponges, fungi, lichens, and monocotyledon plants. In each group again all the members are not silicon utilizing organisms, thus selective members in each group are further classified depending their degree of silicon utilization. Important silicon utilizing bacteria are Mycobacteria, Nocardia, Streptomyces, Staphylococcus, Bacillus, Lactobacillus spp. etc., Important silicon utilizing algae are Centrobacillariophyceae, Pennatibacillariophyceae and Chrysophyceae. Many protozoa belonging to Heterokonta, Choanoflagellida, Actinopoda are well known silicon utilizing microorganisms. Hexactinellida ( glass sponges

  4. Percepção do processo saúde-doença: significados e valores da educação em saúde

    Directory of Open Access Journals (Sweden)

    Ana Maria Chagas Sette Câmara

    Full Text Available A relevância sociológica do estudo das representações sociais do processo saúde-doença está no fato de que elas fundamentam práticas e atitudes dos seus atores, assim como as relações que eles estabelecem com o seu contexto social e com aquilo que lhes acontece. O problema dessa pesquisa consiste em conhecer as representações sociais do processo saúde-doença dos profissionais do PSF, considerando que esse conhecimento pode ser fundamental para o desenvolvimento de práticas educativas em saúde. A abordagem metodológica desta pesquisa foi qualitativa, tendo por base as representações sociais dos profissionais de apoio e das equipes de saúde da família do Centro de Saúde Milionários, em Belo Horizonte, Minas Gerais. Para a coleta de dados, foi utilizada entrevista individual semi-estruturada abordando os seguintes aspectos: processo saúde-doença; educação em saúde; e barreiras ou dificuldades para prescrição/adoção de hábitos saudáveis. Os dados foram analisados pela técnica de análise de conteúdo, a partir das categorias: dimensões do processo saúde-doença; barreiras ou dificuldades para adoção de hábitos saudáveis; e significados e valores da educação em saúde. Os dados apontam que há necessidade de modificações conceituais na formação permanente desses profissionais e da inclusão do enfoque coletivo, abordando o conceito ampliado de saúde com seus determinantes sociais e contextuais. Faz-se necessária também a busca de novas metodologias de educação em saúde, para que os profissionais do PSF possam ir além da informação e consigam a ressignificação dos conceitos do processo saúde-doença, podendo de fato estabelecer novas práticas e novos processos de trabalho em saúde.

  5. Stable configurations of graphene on silicon

    Science.gov (United States)

    Javvaji, Brahmanandam; Shenoy, Bhamy Maithry; Mahapatra, D. Roy; Ravikumar, Abhilash; Hegde, G. M.; Rizwan, M. R.

    2017-08-01

    Integration of graphene on silicon-based nanostructures is crucial in advancing graphene based nanoelectronic device technologies. The present paper provides a new insight on the combined effect of graphene structure and silicon (001) substrate on their two-dimensional anisotropic interface. Molecular dynamics simulations involving the sub-nanoscale interface reveal a most favourable set of temperature independent orientations of the monolayer graphene sheet with an angle of ∽15° between its armchair direction and [010] axis of the silicon substrate. While computing the favorable stable orientations, both the translation and the rotational vibrations of graphene are included. The possible interactions between the graphene atoms and the silicon atoms are identified from their coordination. Graphene sheet shows maximum bonding density with bond length 0.195 nm and minimum bond energy when interfaced with silicon substrate at 15° orientation. Local deformation analysis reveals probability distribution with maximum strain levels of 0.134, 0.047 and 0.029 for 900 K, 300 K and 100 K, respectively in silicon surface for 15° oriented graphene whereas the maximum probable strain in graphene is about 0.041 irrespective of temperature. Silicon-silicon dimer formation is changed due to silicon-carbon bonding. These results may help further in band structure engineering of silicon-graphene lattice.

  6. Synthesis of Silicon Nanocrystals in Microplasma Reactor

    Science.gov (United States)

    Nozaki, Tomohiro; Sasaki, Kenji; Ogino, Tomohisa; Asahi, Daisuke; Okazaki, Ken

    Nanocrystalline silicon particles with a grain size of at least less than 10 nm are widely recognized as one of the key materials in optoelectronic devices, electrodes of lithium battery, bio-medical labels. There is also important character that silicon is safe material to the environment and easily gets involved in existing silicon technologies. To date, several synthesis methods such as sputtering, laser ablation, and plasma enhanced chemical vapor deposition (PECVD) based on low-pressure silane chemistry (SiH4) have been developed for precise control of size and density distributions of silicon nanocrystals. We explore the possibility of microplasma technologies for the efficient production of mono-dispersed nanocrystalline silicon particles in a micrometer-scale, continuous-flow plasma reactor operated at atmospheric pressure. Mixtures of argon, hydrogen, and silicon tetrachloride were activated using very high frequency (VHF = 144 MHz) power source in a capillary glass tube with a volume of less than 1 μ-liter. Fundamental plasma parameters of VHF capacitively coupled microplasma were characterized by optical emission spectroscopy, showing electron density of approximately 1015 cm-3 and rotational temperature of 1500 K, respectively. Such high-density non-thermal reactive plasma has a capability of decomposing silicon tetrachloride into atomic silicon to produce supersaturated atomic silicon vapor, followed by gas phase nucleation via three-body collision. The particle synthesis in high-density plasma media is beneficial for promoting nucleation process. In addition, further growth of silicon nuclei was able to be favorably terminated in a short-residence time reactor. Micro Raman scattering spectrum showed that as-deposited particles were mostly amorphous silicon with small fraction of silicon nanocrystals. Transmission electron micrograph confirmed individual silicon nanocrystals of 3-15 nm size. Although those particles were not mono-dispersed, they were

  7. Silicon Nanocrystal Synthesis in Microplasma Reactor

    Science.gov (United States)

    Nozaki, Tomohiro; Sasaki, Kenji; Ogino, Tomohisa; Asahi, Daisuke; Okazaki, Ken

    Nanocrystalline silicon particles with grains smaller than 5 nm are widely recognized as a key material in optoelectronic devices, lithium battery electrodes, and bio-medical labels. Another important characteristic is that silicon is an environmentally safe material that is used in numerous silicon technologies. To date, several synthesis methods such as sputtering, laser ablation, and plasma-enhanced chemical vapor deposition (PECVD) based on low-pressure silane chemistry (SiH4) have been developed for precise control of size and density distributions of silicon nanocrystals. In this study, we explore the possibility of microplasma technologies for efficient production of mono-dispersed nanocrystalline silicon particles on a micrometer-scale, continuous-flow plasma reactor operated at atmospheric pressure. Mixtures of argon, hydrogen, and silicon tetrachloride were activated using a very-high-frequency (144 MHz) power source in a capillary glass tube with volume of less than 1 μl. Fundamental plasma parameters of the microplasma were characterized using optical emission spectroscopy, which respectively indicated electron density of 1015 cm-3, argon excitation temperature of 5000 K, and rotational temperature of 1500 K. Such high-density non-thermal reactive plasma can decompose silicon tetrachloride into atomic silicon to produce supersaturated silicon vapor, followed by gas-phase nucleation via three-body collision: particle synthesis in high-density plasma media is beneficial for promoting nucleation processes. In addition, further growth of silicon nuclei can be terminated in a short-residence-time reactor. Micro-Raman scattering spectra showed that as-deposited particles are mostly amorphous silicon with a small fraction of silicon nanocrystals. Transmission electron micrography confirmed individual 3-15 nm silicon nanocrystals. Although particles were not mono-dispersed, they were well separated and not coagulated.

  8. Ceramic Technology Project data base: September 1992 summary report

    Energy Technology Data Exchange (ETDEWEB)

    Keyes, B.L.P.

    1993-06-01

    Data presented in this report represent an intense effort to improve processing methods, testing methods, and general mechanical properties (rupture modulus, tensile, creep, stress-rupture, dynamic and cyclic fatigue, fracture toughness) of candidate ceramics for use in advanced heat engines. This work was performed by many facilities and represents only a small part of the data generated by the Ceramic Technology Project (CTP) since 1986. Materials discussed include GTE PY6, GN-10, NT-154, NT-164, SN-260, SN-251, SN-252, AY6, silicon nitride combined with rare-earth oxides, Y-TZP, ZTA, NC-433, NT-230, Hexoloy SA, MgO-PSZ-to-MgO-PSZ joints, MgO-PSZ-to-cast iron, and a few whisker/fiber-reinforced ceramics. Information in this report was taken from the project`s semiannual and bimonthly progress reports and from final reports summarizing the results of individual studies. Test results are presented in tabular form and in graphs. All data, including test rig descriptions and material characterizations, are stored in the CTP data base and are available to all project participants on request. The objective of this report is to make available the test results from these studies but not to draw conclusions from those data.

  9. Dry etch method for texturing silicon and device

    Energy Technology Data Exchange (ETDEWEB)

    Gershon, Talia S.; Haight, Richard A.; Kim, Jeehwan; Lee, Yun Seog

    2017-07-25

    A method for texturing silicon includes loading a silicon wafer into a vacuum chamber, heating the silicon wafer and thermal cracking a gas to generate cracked sulfur species. The silicon wafer is exposed to the cracked sulfur species for a time duration in accordance with a texture characteristic needed for a surface of the silicon wafer.

  10. Thermal and mechanical joints to cryo-cooled silicon monochromatorcrystals

    Energy Technology Data Exchange (ETDEWEB)

    MacDowell, A.; Fakra, S.; Morrison, G.

    2006-07-14

    We describe the performance of various materials used as thethermal interface between silicon to silicon and silicon to copper jointswhen operated at ~;120K and loaded with ~;20 watts of thermal power. Wefind that only the indium based silicon-to-silicon joint isreliable.

  11. Psicologia da saúde crítica no contexto hospitalar

    Directory of Open Access Journals (Sweden)

    Denis Barros de Carvalho

    Full Text Available O texto apresenta uma discussão sobre a Psicologia da saúde no contexto hospitalar a partir de uma perspectiva histórica e ética, mostrando como o desenvolvimento desse campo foi caracterizado pelo surgimento de duas perspectivas: a Psicologia da saúde tradicional e a Psicologia da saúde crítica. O modelo de quatro abordagens à Psicologia da saúde é apresentado e reformulado com a inclusão do conceito de Psicologia sanitária, e a prática em Psicologia da saúde é discutida à luz do conceito de reflexividade. Por fim, alguns questionamentos derivados da Psicologia da saúde crítica são feitos à prática do psicólogo no contexto hospitalar.

  12. 18F-Labeled Silicon-Based Fluoride Acceptors: Potential Opportunities for Novel Positron Emitting Radiopharmaceuticals

    Directory of Open Access Journals (Sweden)

    Vadim Bernard-Gauthier

    2014-01-01

    Full Text Available Background. Over the recent years, radiopharmaceutical chemistry has experienced a wide variety of innovative pushes towards finding both novel and unconventional radiochemical methods to introduce fluorine-18 into radiotracers for positron emission tomography (PET. These “nonclassical” labeling methodologies based on silicon-, boron-, and aluminium-18F chemistry deviate from commonplace bonding of an [18F]fluorine atom (18F to either an aliphatic or aromatic carbon atom. One method in particular, the silicon-fluoride-acceptor isotopic exchange (SiFA-IE approach, invalidates a dogma in radiochemistry that has been widely accepted for many years: the inability to obtain radiopharmaceuticals of high specific activity (SA via simple IE. Methodology. The most advantageous feature of IE labeling in general is that labeling precursor and labeled radiotracer are chemically identical, eliminating the need to separate the radiotracer from its precursor. SiFA-IE chemistry proceeds in dipolar aprotic solvents at room temperature and below, entirely avoiding the formation of radioactive side products during the IE. Scope of Review. A great plethora of different SiFA species have been reported in the literature ranging from small prosthetic groups and other compounds of low molecular weight to labeled peptides and most recently affibody molecules. Conclusions. The literature over the last years (from 2006 to 2014 shows unambiguously that SiFA-IE and other silicon-based fluoride acceptor strategies relying on 18F− leaving group substitutions have the potential to become a valuable addition to radiochemistry.

  13. Metamaterial-inspired silicon nanophotonics

    Science.gov (United States)

    Staude, Isabelle; Schilling, Jörg

    2017-04-01

    The prospect of creating metamaterials with optical properties greatly exceeding the parameter space accessible with natural materials has been inspiring intense research efforts in nanophotonics for more than a decade. Following an era of plasmonic metamaterials, low-loss dielectric nanostructures have recently moved into the focus of metamaterial-related research. This development was mainly triggered by the experimental observation of electric and magnetic multipolar Mie-type resonances in high-refractive-index dielectric nanoparticles. Silicon in particular has emerged as a popular material choice, due to not only its high refractive index and very low absorption losses in the telecom spectral range, but also its paramount technological relevance. This Review overviews recent progress on metamaterial-inspired silicon nanostructures, including Mie-resonant and off-resonant regimes.

  14. CMS silicon tracker milestone 200

    CERN Document Server

    Dierlamm, A

    2002-01-01

    The tracker of CMS will fully consist of silicon micro-strip and pixel sensors. Building a detector with 210 m/sup 2/ sensor surface in about 3 years requires a tightly controlled construction schedule. All different aspects of the production are exercised within a pre- production of 200 modules (Milestone 200) to identify and eliminate possible bottlenecks and to test the complete electronic chain. The quality, process stability and radiation hardness of the silicon sensors will be permanently monitored. Automatic assembly procedure and industrial bonding machines will guarantee a fast and reliable construction. All modules will be tested for signal, noise and pedestals at room temperature and operation temperature of -10 degrees C. Quality assurance of the Milestone 200 sensors and modules including irradiation and stability tests are presented. (6 refs).

  15. Exceptional plasticity of silicon nanobridges

    Energy Technology Data Exchange (ETDEWEB)

    Ishida, Tadashi; Sato, Takaaki; Toshiyoshi, Hiroshi; Collard, Dominique; Fujita, Hiroyuki [University of Tokyo, Institute of Industrial Science, 4-6-1 Komaba Meguro, Tokyo 153-8505 (Japan); Cleri, Fabrizio [Institut d' Electronique Microelectronique et Nanotechnologie (CNRS UMR 8520), Universite de Lille I, Avenue Poincare BP60069 59652 Villeneuve d' Ascq (France); Kakushima, Kuniyuki [Tokyo Institute of Technology, 4259, Nagatsuda, Midori, Yokohama, Kanagawa 226-8502 (Japan); Mita, Makoto [Department of Spacecraft Engineering, Japan Aerospace Exploration Agency, 3-1-1, Yoshinodai, Sagamihara, Kanagawa 229-8510 (Japan); Miyata, Masaki; Itamura, Noriaki; Sasaki, Naruo [Department of Materials and Life Sciences, Seikei University, 3-3-1, Kitamachi, Kichijoji, Musashino, Tokyo 180-8633 (Japan); Endo, Junji, E-mail: tadashii@iis.u-tokyo.ac.jp [FK Optical laboratory, 1-13-4 Nakano Niiza Saitama, 352-0005 (Japan)

    2011-09-02

    The plasticity of covalently bonded materials is a subject at the forefront of materials science, bearing on a wide range of technological and fundamental aspects. However, covalent materials fracture in a brittle manner when the deformation exceeds just a few per cent. It is predicted that a macroscopically brittle material like silicon can show nanoscale plasticity. Here we report the exceptional plasticity observed in silicon nanocontacts ('nanobridges') at room temperature using a special experimental setup combining a transmission electron microscope and a microelectromechanical system. When accounting for surface diffusion, we succeeded in elongating the nanocontact into a wire-like structure, with a fivefold increase in volume, up to more than twenty times the original length. Such a large plasticity was caused by the stress-assisted diffusion and the sliding of the intergranular, amorphous-like material among the nanocrystals.

  16. Supersonic Dislocation Bursts in Silicon

    Science.gov (United States)

    Hahn, E. N.; Zhao, S.; Bringa, E. M.; Meyers, M. A.

    2016-06-01

    Dislocations are the primary agents of permanent deformation in crystalline solids. Since the theoretical prediction of supersonic dislocations over half a century ago, there is a dearth of experimental evidence supporting their existence. Here we use non-equilibrium molecular dynamics simulations of shocked silicon to reveal transient supersonic partial dislocation motion at approximately 15 km/s, faster than any previous in-silico observation. Homogeneous dislocation nucleation occurs near the shock front and supersonic dislocation motion lasts just fractions of picoseconds before the dislocations catch the shock front and decelerate back to the elastic wave speed. Applying a modified analytical equation for dislocation evolution we successfully predict a dislocation density of 1.5 × 1012 cm-2 within the shocked volume, in agreement with the present simulations and realistic in regards to prior and on-going recovery experiments in silicon.

  17. Cuidados em saúde entre portadores de diabetes mellitus autorreferido no Brasil, Pesquisa Nacional de Saúde, 2013

    Directory of Open Access Journals (Sweden)

    Deborah Carvalho Malta

    2015-12-01

    Full Text Available Resumo: Objetivo: Descrever medidas do cuidado assistencial destinadas ao paciente com diabetes mellitus autorreferido no Brasil. Métodos: Foram utilizados dados da Pesquisa Nacional de Saúde(2013, estudo transversal de base populacional, referentes ao cuidado em saúde com o diabetes mellitus autorreferido, quanto ao uso de serviços de saúde e acesso a medicamentos. Resultados: A prevalência de diabetes mellitus autorreferido foi de 6,2%, e 11,5% da população nunca fez uma glicemia na vida. Dos adultos que referiram diabetes mellitus , 80,2% tomaram medicamentos nas duas semanas anteriores à entrevista, 57,4% usaram o Programa Farmácia Popular, 73,2% receberam assistência médica e 47,1% realizaram o atendimento nas Unidades Básicas de Saúde. Em 65,2%, o médico que atendeu na última consulta era o mesmo das consultas anteriores, 95,3% dos pacientes conseguiram realizar os exames complementares solicitados e 83,3% conseguiram fazer as consultas com o médico especialista. A avaliação de pés e olhos foi relatada por 35,6 e 29,1% dos portadores de diabetes mellitus , respectivamente. Relataram internação hospitalar por causa do diabetes ou de alguma complicação 13,4% dos adultos, e outros 7,0% relataram limitações nas atividades diárias. Em geral, mulheres, assim como a população mais idosa, de maior escolaridade, brancos e residentes nas regiões Sul e Sudeste, tiveram maior prevalência da doença e maior acesso aos serviços, medicamentos e consultas. Discussão: Os cuidados aos portadores de diabetes foram recebidos de forma adequada, na maioria dos casos, o que é essencial para manter a qualidade de vida dos pacientes e prevenir desfechos mais graves.

  18. Solution phase synthesis of aluminum-doped silicon nanoparticles via room-temperature, solvent based chemical reduction of silicon tetrachloride

    Science.gov (United States)

    Mowbray, Andrew James

    We present a method of wet chemical synthesis of aluminum-doped silicon nanoparticles (Al-doped Si NPs), encompassing the solution-phase co-reduction of silicon tetrachloride (SiCl4) and aluminum chloride (AlCl 3) by sodium naphthalide (Na[NAP]) in 1,2-dimethoxyethane (DME). The development of this method was inspired by the work of Baldwin et al. at the University of California, Davis, and was adapted for our research through some noteworthy procedural modifications. Centrifugation and solvent-based extraction techniques were used throughout various stages of the synthesis procedure to achieve efficient and well-controlled separation of the Si NP product from the reaction media. In addition, the development of a non-aqueous, formamide-based wash solution facilitated simultaneous removal of the NaCl byproduct and Si NP surface passivation via attachment of 1-octanol to the particle surface. As synthesized, the Si NPs were typically 3-15 nm in diameter, and were mainly amorphous, as opposed to crystalline, as concluded from SAED and XRD diffraction pattern analysis. Aluminum doping at various concentrations was accomplished via the inclusion of aluminum chloride (AlCl3); which was in small quantities dissolved into the synthesis solution to be reduced alongside the SiCl4 precursor. The introduction of Al into the chemically-reduced Si NP precipitate was not found to adversely affect the formation of the Si NPs, but was found to influence aspects such as particle stability and dispersibility throughout various stages of the procedure. Analytical techniques including transmission electron microscopy (TEM), FTIR spectroscopy, and ICP-optical emission spectroscopy were used to comprehensively characterize the product NPs. These methods confirm both the presence of Al and surface-bound 1-octanol in the newly formed Si NPs.

  19. Enredando lutas cotidianas: dispositivos de saúde pela cidade

    Directory of Open Access Journals (Sweden)

    Arielle Rocha de Oliveira Silva

    2009-12-01

    Full Text Available A partir das experiências de intervenções em serviços públicos de saúde e em outros setores da cidade, este trabalho afirma uma prática oficineira descentralizada capaz de compor na construção de redes sociais, servindo de instrumento de análise e possibilitando a invenção de modos de vida e afirmação de singularidades. As intervenções na cidade abrem caminhos para mudanças nos processos em curso e contribuem para a produção de saúde/cidadania por meio da potência conectiva das lutas. O enlace dessas temáticas visa ampliar o campo problemático da atenção psicossocial e fortalecer a luta antimanicomial no Espírito Santo, apostando em novas formas de atuação.

  20. Altera – Technical update, presented by Sascoholz SA

    CERN Multimedia

    FI Department

    2008-01-01

    Thursday 28 August 2008 From 9h00 to 12h00 (welcome at 08h45) in Room B (Main Building 61/1-009) SascoHolz SA cordially invites you to an informative and interesting technical update on the latest Altera FPGA developments. Introducing Altera’s Stratix IV Device Family 40-nm high-performance, high-end FPGAs with 8.5-Gbps transceiver option The Stratix IV FPGA family gives you the highest density, highest system performance, and the lowest power available in an FPGA, enabling innovation without compromise. Speaker Ole Horn, FAE Sascoholz Agenda Altera Stratix IV Device FamilyIntroduction Logic Fabric Architecture DSP Blocks Tri-Matrix Memory PLL and Clock Networks Design Security I/O Connectivity High-Speed Transceiver Low Power Consumption Language: English As a member of the globally active distribution group, Arrow Electronics, SascoHolz SA does more than just following the concepts of classic broadline distributors. In fact, we offer a depth of service throughou...

  1. New Young Star Candidates in CG4 and Sa101

    CERN Document Server

    Rebull, L M; Hoette, V; Kim, J S; Laine, S; Foster, M; Laher, R; Legassie, M; Mallory, C R; McCarron, K; Sherry, W H

    2011-01-01

    The CG4 and Sa101 regions together cover a region of ~0.5 square degree in the vicinity of a "cometary globule" that is part of the Gum Nebula. There are seven previously identified young stars in this region; we have searched for new young stars using mid- and far-infrared data (3.6 to 70 microns) from the Spitzer Space Telescope, combined with ground-based optical data and near-infrared data from the Two-Micron All-Sky Survey (2MASS). We find infrared excesses in all 6 of the previously identified young stars in our maps, and we identify 16 more candidate young stars based on apparent infrared excesses. Most (73%) of the new young stars are Class II objects. There is a tighter grouping of young stars and young star candidates in the Sa101 region, in contrast to the CG4 region, where there are fewer young stars and young star candidates, and they are more dispersed. Few likely young objects are found in the "fingers" of the dust being disturbed by the ionization front from the heart of the Gum Nebula.

  2. Magnetic field measurements of JT-60SA CS model coil

    Energy Technology Data Exchange (ETDEWEB)

    Obana, Tetsuhiro, E-mail: obana.tetsuhiro@LHD.nifs.ac.jp [National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan); Takahata, Kazuya; Hamaguchi, Shinji; Chikaraishi, Hirotaka; Mito, Toshiyuki; Imagawa, Shinsaku [National Institute for Fusion Science, 322-6 Oroshi, Toki, Gifu 509-5292 (Japan); Kizu, Kaname; Murakami, Haruyuki; Natsume, Kyohei; Yoshida, Kiyoshi [Japan Atomic Energy Agency, 801-1 Mukoyama, Naka, Ibaraki 311-0193 (Japan)

    2015-01-15

    Highlights: • Magnetic fields of the JT-60SA CS model coil were measured. • While the coil current was held constant at 20 kA, magnetic fields varied slightly with several different long time constants. • We investigated coils consisting of CIC conductors and having long time constants. - Abstract: In a cold test of the JT-60SA CS model coil, which has a quad-pancake configuration consisting of a Nb{sub 3}Sn cable-in-conduit (CIC) conductor, magnetic fields were measured using Hall sensors. For a holding coil current of 20 kA, measured magnetic fields varied slightly with long time constants in the range 17–571 s, which was much longer than the time constant derived from a measurement using a short straight sample. To validate the measurements, the magnetic fields of the model coil were calculated using a computational model representing the positions of Nb{sub 3}Sn strands inside the CIC conductor. The calculated results were in good agreement with the measurements. Consequently, the validity of the magnetic field measurements was confirmed. Next, we investigated other coils consisting of CIC conductors and having long time constants. The only commonality among the coils was the use of CIC conductors. At present, there is no obvious way to prevent generation of such magnetic-field variations with long time constants.

  3. Reflexões sobre o papel das unidades de economia da saúde no âmbito de sistemas nacionais de saúde

    Directory of Open Access Journals (Sweden)

    Fabiola Sulpino Vieira

    Full Text Available Resumo O objetivo deste texto é apresentar algumas reflexões sobre o papel e a relevância das unidades de economia da saúde (UES no âmbito de sistemas nacionais de saúde. Parte-se dos fundamentos deste campo de conhecimento e de sua contribuição à gestão em saúde para tecer considerações sobre o papel e a relevância dessas unidades. São discutidas questões como o conhecimento dos gestores da saúde e lideranças políticas sobre economia da saúde, a necessidade de atuação transversal da UES na organização e de corpo técnico multidisciplinar qualificado, assim como a natureza técnica e política do trabalho, as possibilidades e limites para sua atuação, seus aspectos e a relação com grupos externos de pesquisa. Por fim, ressalta-se que o trabalho de equipe interna especializada em economia da saúde constitui um dos meios para qualificar o processo de tomada de decisão nas organizações públicas de saúde, visando à otimização do uso dos recursos e à equidade em sua alocação.

  4. Contribuições do PET-Saúde/Redes de Atenção Psicossocial à Saúde da Família

    Directory of Open Access Journals (Sweden)

    Larissa de Almeida Rézio

    2015-12-01

    Full Text Available O estudo objetivou analisar as contribuições do Programa de Educação pelo Trabalho para a Saúde – PET-Saúde/Redes de Atenção Psicossocial à Saúde - a uma unidade de Estratégia de Saúde da Família em Cuiabá, Mato Grosso, Brasil. Trata-se de um estudo descritivo, com abordagem qualitativa, utilizando entrevista com cinco profissionais de saúde e dois acadêmicos bolsistas e registros de atividades realizadas no serviço. À luz da análise de conteúdo temática, sistematizamos quatro subtemas: “articulação da rede”; “qualificação da assistência à saúde mental”, “melhora do conhecimento dos profissionais” e “superação de estigmas sobre o paciente em sofrimento psíquico”. Houve sensibilização dos profissionais e bolsistas sobre a importância do acompanhamento das pessoas com sofrimento mental na atenção básica, em articulação com serviços de saúde mental.

  5. Purity of silicon: with great effect on its performance in graphite-silicon anode materials for lithium-ion batteries

    Science.gov (United States)

    Jin, Chenxin; Xu, Guojun; Liu, Liekai; Yue, Zhihao; Li, Xiaomin; Sun, Fugen; Tang, Hao; Huang, Haibin; Zhou, Lang

    2017-09-01

    Ferrosilicon, industrial grade silicon, solar grade silicon, and electronic grade silicon were ball-milled to form four types of silicon powders, which were mixed with graphite powders at weight ratio of 5:95, respectively, for being used as graphite-silicon anode materials in lithium-ion batteries (LIBs). The effect of the purity of silicon on its electrochemical performance in graphite-silicon anode materials for LIBs was investigated by the cycle and rate tests. Results show that silicon with higher purity shows higher capacity, better cycle, and rate performance. In addition, the significant difference in capacity of the four graphite-silicon anodes with different purities of silicon is not completely resulted from the content of silicon materials, and the influence of the impurity inside the silicon cannot be ignored as well. The sample prepared from electronic grade silicon presents the highest first discharge capacity, which is 440.5 mAh g-1.

  6. Silicon nanocrystals as handy biomarkers

    Science.gov (United States)

    Fujioka, Kouki; Hoshino, Akiyoshi; Manabe, Noriyoshi; Futamura, Yasuhiro; Tilley, Richard; Yamamoto, Kenji

    2007-02-01

    Quantum dots (QDs) have brighter and longer fluorescence than organic dyes. Therefore, QDs can be applied to biotechnology, and have capability to be applied to medical technology. Currently, among the several types of QDs, CdSe with a ZnS shell is one of the most popular QDs to be used in biological experiments. However, when the CdSe QDs were applied to clinical technology, potential toxicological problems due to CdSe core should be considered. To eliminate the problem, silicon nanocrystals, which have the potential of biocompatibility, could be a candidate of alternate probes. Silicon nanocrystals have been synthesized using several techniques such as aerosol, electrochemical etching, laser pyrolysis, plasma deposition, and colloids. Recently, the silicon nanocrystals were reported to be synthesized in inverse micelles and also stabilized with 1-heptene or allylamine capping. Blue fluorescence of the nanocrystals was observed when excited with a UV light. The nanocrystals covered with 1-heptene are hydrophobic, whereas the ones covered with allylamine are hydrophilic. To test the stability in cytosol, the water-soluble nanocrystals covered with allylamine were examined with a Hela cell incorporation experiment. Bright blue fluorescence of the nanocrystals was detected in the cytosol when excited with a UV light, implying that the nanocrystals were able to be applied to biological imaging. In order to expand the application range, we synthesized and compared a series of silicon nanocrystals, which have variable surface modification, such as alkyl group, alcohol group, and odorant molecules. This study will provide a wider range of optoelectronic applications and bioimaging technology.

  7. Chemical Reactions of Silicon Clusters

    OpenAIRE

    Ramakrishna, Mushti V.; Pan, Jun

    1994-01-01

    Smalley and co-workers discovered that chemisorption reactivities of silicon clusters vary over three orders of magnitude as a function of cluster size. In particular, they found that \\Si{33}, \\Si{39}, and \\Si{45} clusters are least reactive towards various reagents compared to their immediate neighbors in size. We explain these observations based on our stuffed fullerene model. This structural model consists of bulk-like core of five atoms surrounded by fullerene-like surface. Reconstruction...

  8. Magic Numbers of Silicon Clusters

    OpenAIRE

    Pan, Jun; Ramakrishna, Mushti V.

    1994-01-01

    A structural model for intermediate sized silicon clusters is proposed that is able to generate unique structures without any dangling bonds. This structural model consists of bulk-like core of five atoms surrounded by fullerene-like surface. Reconstruction of the ideal fullerene geometry results in the formation of crown atoms surrounded by $\\pi$-bonded dimer pairs. This model yields unique structures for \\Si{33}, \\Si{39}, and \\Si{45} clusters without any dangling bonds and hence explains wh...

  9. Characterisation of Silicon Pad Diodes

    CERN Document Server

    Hodson, Thomas Connor

    2017-01-01

    Silicon pad sensors are used in high luminosity particle detectors because of their excellent timing resolution, radiation tolerance and possible high granularity. The effect of different design decisions on detector performance can be investigated nondestructively through electronic characterisation of the sensor diodes. Methods for making accurate measurements of leakage current and cell capacitance are described using both a standard approach with tungsten needles and an automated approach with a custom multiplexer and probing setup.

  10. The ATLAS Silicon Pixel Sensors

    CERN Document Server

    Alam, M S; Einsweiler, K F; Emes, J; Gilchriese, M G D; Joshi, A; Kleinfelder, S A; Marchesini, R; McCormack, F; Milgrome, O; Palaio, N; Pengg, F; Richardson, J; Zizka, G; Ackers, M; Andreazza, A; Comes, G; Fischer, P; Keil, M; Klasen, V; Kühl, T; Meuser, S; Ockenfels, W; Raith, B; Treis, J; Wermes, N; Gössling, C; Hügging, F G; Wüstenfeld, J; Wunstorf, R; Barberis, D; Beccherle, R; Darbo, G; Gagliardi, G; Gemme, C; Morettini, P; Musico, P; Osculati, B; Parodi, F; Rossi, L; Blanquart, L; Breugnon, P; Calvet, D; Clemens, J-C; Delpierre, P A; Hallewell, G D; Laugier, D; Mouthuy, T; Rozanov, A; Valin, I; Aleppo, M; Caccia, M; Ragusa, F; Troncon, C; Lutz, Gerhard; Richter, R H; Rohe, T; Brandl, A; Gorfine, G; Hoeferkamp, M; Seidel, SC; Boyd, GR; Skubic, P L; Sícho, P; Tomasek, L; Vrba, V; Holder, M; Ziolkowski, M; D'Auria, S; del Papa, C; Charles, E; Fasching, D; Becks, K H; Lenzen, G; Linder, C

    2001-01-01

    Prototype sensors for the ATLAS silicon pixel detector have been developed. The design of the sensors is guided by the need to operate them in the severe LHC radiation environment at up to several hundred volts while maintaining a good signal-to-noise ratio, small cell size, and minimal multiple scattering. The ability to be operated under full bias for electrical characterization prior to the attachment of the readout integrated circuit electronics is also desired.

  11. VULCANIZATION KINETICS OF SILICONE RUBBER

    Institute of Scientific and Technical Information of China (English)

    YUAN Qiang; LI Yufu; LI Guangliang

    1988-01-01

    Vulcanization rate of silicone rubber with the aid of organic peroxide or hydrosilylation agent was studied by using oscillation disk rheometer. It was found that the process of network formation would take place through one, two or three steps depending on the structure of the reactants. The effect of phenyl group, vinyl terminals on polysiloxane chain and the functionality of silylation agent was also studied.

  12. Zhongguan Village, China's Silicon Valley

    Institute of Scientific and Technical Information of China (English)

    Liu Xinwen

    2008-01-01

    @@ In 1999,driven by the dream of using technology to change people's lives,Li Yanhong,returned to Zhongguancun(Zhongguan Village in Chinese),Beijing from Silicon Valley in the U.S.to create Baidu.com.Over the years,Baidu has become the most frequently hitted website in China as well as the largest Chinesc search engine and Chinese language website in the world.

  13. Joint Service Aircrew Mask (JSAM) - Strategic Aircraft (SA): Noise Attenuation Performance

    Science.gov (United States)

    2015-08-25

    AFRL-RH-WP-TP-2015-0026 Joint Service Aircrew Mask (JSAM) – Strategic Aircraft (SA): Noise Attenuation Performance...2015 – July 2015 4. TITLE AND SUBTITLE Joint Service Aircrew Mask (JSAM) – Strategic Aircraft (SA): Noise Attenuation Performance 5a. CONTRACT...determine if the Joint Service Aircrew Mask (JSAM) –Strategic Aircraft (SA) performance specification requirements were being met. The requirement stated

  14. ANALISIS DAN MODEL STRATEGI PENINGKATAN DAYA SAING PRODUK EDAMAME BEKU

    Directory of Open Access Journals (Sweden)

    Sandryas Alief Kurniasanti

    2015-03-01

    penelitian ini adalah untuk menganalisis daya saing dan merumuskan prioritas alternatif strategi peningkatan daya saing produk edamame beku di PT MT 27. Metode yang digunakan dalam penelitian ini adalah Revealed Comparative Advantage untuk mengetahui kinerja ekspor dari produk edamame beku di pasar dunia, kemudian menganalisis faktor persaingan dengan menggunakan Diamond Porter’s Theory. Alternatif strategi dihasilkan dari analisis SWOT dan ditentukan prioritasnya dengan menggunakan analytical hierarchy process dari satu narasumber ahli. Hasil penelitian menunjukkan bahwa prioritas alternatif strategi peningkatan daya saing produk edamame beku PT MT 27 secara berurutan meliputi: (1 diversifikasi pasar, (2 diversifikasi produk, (3 meningkatkan kerjasama luar negeri, (4 pengembangan divisi Research and Development, (5 mengembangkan program Corporate Social Responsibility, (6 pengelolaan keuangan secara baik dan benar, serta (7 mengembangkan areal pertanian yang berbasis rumah kaca untuk menghindari cuaca buruk karena beriklim tropis. Implikasi Manajerial dari penelitian ini adalah mengembangkan pasar yang sudah ada, dan mengembangkan jenis produk yang diproduksi untuk memenuhi selera pasar ekspor dan juga penghematan biaya produksi. Kata kunci: daya saing, edamame beku, Mitratani Dua Tujuh, strategi daya saing

  15. Silicon spintronics: Progress and challenges

    Science.gov (United States)

    Sverdlov, Viktor; Selberherr, Siegfried

    2015-07-01

    Electron spin attracts much attention as an alternative to the electron charge degree of freedom for low-power reprogrammable logic and non-volatile memory applications. Silicon appears to be the perfect material for spin-driven applications. Recent progress and challenges regarding spin-based devices are reviewed. An order of magnitude enhancement of the electron spin lifetime in silicon thin films by shear strain is predicted and its impact on spin transport in SpinFETs is discussed. A relatively weak coupling between spin and effective electric field in silicon allows magnetoresistance modulation at room temperature, however, for long channel lengths. Due to tunneling magnetoresistance and spin transfer torque effects, a much stronger coupling between the spin (magnetization) orientation and charge current is achieved in magnetic tunnel junctions. Magnetic random access memory (MRAM) built on magnetic tunnel junctions is CMOS compatible and possesses all properties needed for future universal memory. Designs of spin-based non-volatile MRAM cells are presented. By means of micromagnetic simulations it is demonstrated that a substantial reduction of the switching time can be achieved. Finally, it is shown that any two arbitrary memory cells from an MRAM array can be used to perform a logic operation. Thus, an intrinsic non-volatile logic-in-memory architecture can be realized.

  16. Silicon spintronics: Progress and challenges

    Energy Technology Data Exchange (ETDEWEB)

    Sverdlov, Viktor; Selberherr, Siegfried, E-mail: Selberherr@TUWien.ac.at

    2015-07-14

    Electron spin attracts much attention as an alternative to the electron charge degree of freedom for low-power reprogrammable logic and non-volatile memory applications. Silicon appears to be the perfect material for spin-driven applications. Recent progress and challenges regarding spin-based devices are reviewed. An order of magnitude enhancement of the electron spin lifetime in silicon thin films by shear strain is predicted and its impact on spin transport in SpinFETs is discussed. A relatively weak coupling between spin and effective electric field in silicon allows magnetoresistance modulation at room temperature, however, for long channel lengths. Due to tunneling magnetoresistance and spin transfer torque effects, a much stronger coupling between the spin (magnetization) orientation and charge current is achieved in magnetic tunnel junctions. Magnetic random access memory (MRAM) built on magnetic tunnel junctions is CMOS compatible and possesses all properties needed for future universal memory. Designs of spin-based non-volatile MRAM cells are presented. By means of micromagnetic simulations it is demonstrated that a substantial reduction of the switching time can be achieved. Finally, it is shown that any two arbitrary memory cells from an MRAM array can be used to perform a logic operation. Thus, an intrinsic non-volatile logic-in-memory architecture can be realized.

  17. Characterisation of some experimental silicones.

    Science.gov (United States)

    Parker, S; Meththananda, I; Braden, M; Pearson, G J

    2006-12-01

    Release of antimicrobials/antibacterials like chlorhexidine diacetate (CHD) has proved successful in inhibiting Candidal colonisation of silicone-based biomaterials. However, their addition will increase water uptake and may compromise the mechanical integrity. Two experimental silicones (S1 and S2) differing only in the surface treatment of the filler, were investigated. Ultimate tensile strength (UTS), % elongation at break (Eb), Shore A hardness and, when doped with 1% CHD, water uptake and CHD release were measured. Elastic modulus (E) was calculated from the hardness measurements. There was no significant difference in UTS and Eb between the two materials. However S1 had a higher hardness (30.6 +/- 0.97) and thus E (0.76 MPa) than S2 (hardness = 23.8 +/- 0.48, E = 0.45 MPa). Water uptake for S2 (0.6%) was higher than for S2 (0.1) and addition of CHD dramatically increased the uptake of both (S1 = 3.1%, S2 = 4.0%). Release of CHD was higher for S2 (30%) than S1 (27%). Equating osmotic pressure within the droplets with elastic restraining force gave an extension ratio of 1.95 for S1 and 5.39 for S2. Thus, addition of a hydrophilic agent can compromise the mechanical integrity of low modulus silicones.

  18. The DAMPE silicon tungsten tracker

    CERN Document Server

    Gallo, Valentina; Asfandiyarov, R; Azzarello, P; Bernardini, P; Bertucci, B; Bolognini, A; Cadoux, F; Caprai, M; Domenjoz, M; Dong, Y; Duranti, M; Fan, R; Franco, M; Fusco, P; Gargano, F; Gong, K; Guo, D; Husi, C; Ionica, M; Lacalamita, N; Loparco, F; Marsella, G; Mazziotta, M N; Mongelli, M; Nardinocchi, A; Nicola, L; Pelleriti, G; Peng, W; Pohl, M; Postolache, V; Qiao, R; Surdo, A; Tykhonov, A; Vitillo, S; Wang, H; Weber, M; Wu, D; Wu, X; Zhang, F; De Mitri, I; La Marra, D

    2017-01-01

    The DArk Matter Particle Explorer (DAMPE) satellite has been successfully launched on the 17th December 2015. It is a powerful space detector designed for the identification of possible Dark Matter signatures thanks to its capability to detect electrons and photons with an unprecedented energy resolution in an energy range going from few GeV up to 10 TeV. Moreover, the DAMPE satellite will contribute to a better understanding of the propagation mechanisms of high energy cosmic rays measuring the nuclei flux up to 100 TeV. DAMPE is composed of four sub-detectors: a plastic strip scintillator, a silicon-tungsten tracker-converter (STK), a BGO imaging calorimeter and a neutron detector. The STK is made of twelve layers of single-sided AC-coupled silicon micro-strip detectors for a total silicon area of about 7 $m^2$ . To promote the conversion of incident photons into electron-positron pairs, tungsten foils are inserted into the supporting structure. In this document, a detailed description of the STK constructi...

  19. Casting larger polycrystalline silicon ingots

    Energy Technology Data Exchange (ETDEWEB)

    Wohlgemuth, J.; Tomlinson, T.; Cliber, J.; Shea, S.; Narayanan, M.

    1995-08-01

    Solarex has developed and patented a directional solidification casting process specifically designed for photovoltaics. In this process, silicon feedstock is melted in a ceramic crucible and solidified into a large grained semicrystalline silicon ingot. In-house manufacture of low cost, high purity ceramics is a key to the low cost fabrication of Solarex polycrystalline wafers. The casting process is performed in Solarex designed casting stations. The casting operation is computer controlled. There are no moving parts (except for the loading and unloading) so the growth process proceeds with virtually no operator intervention Today Solarex casting stations are used to produce ingots from which 4 bricks, each 11.4 cm by 11.4 cm in cross section, are cut. The stations themselves are physically capable of holding larger ingots, that would yield either: 4 bricks, 15 cm by 15 an; or 9 bricks, 11.4 cm by 11.4 an in cross-section. One of the tasks in the Solarex Cast Polycrystalline Silicon PVMaT Program is to design and modify one of the castings stations to cast these larger ingots. If successful, this effort will increase the production capacity of Solarex`s casting stations by 73% and reduce the labor content for casting by an equivalent percentage.

  20. Development of Radiation Hard Radiation Detectors, Differences between Czochralski Silicon and Float Zone Silicon

    CERN Document Server

    Tuominen, Eija

    2012-01-01

    The purpose of this work was to develop radiation hard silicon detectors. Radiation detectors made ofsilicon are cost effective and have excellent position resolution. Therefore, they are widely used fortrack finding and particle analysis in large high-energy physics experiments. Silicon detectors willalso be used in the CMS (Compact Muon Solenoid) experiment that is being built at the LHC (LargeHadron Collider) accelerator at CERN (European Organisation for Nuclear Research). This work wasdone in the CMS programme of Helsinki Institute of Physics (HIP).Exposure of the silicon material to particle radiation causes irreversible defects that deteriorate theperformance of the silicon detectors. In HIP CMS Programme, our approach was to improve theradiation hardness of the silicon material with increased oxygen concentration in silicon material. Westudied two different methods: diffusion oxygenation of Float Zone silicon and use of high resistivityCzochralski silicon.We processed, characterised, tested in a parti...

  1. Single-Event Effects in Silicon and Silicon Carbide Power Devices

    Science.gov (United States)

    Lauenstein, Jean-Marie; Casey, Megan C.; LaBel, Kenneth A.; Topper, Alyson D.; Wilcox, Edward P.; Kim, Hak; Phan, Anthony M.

    2014-01-01

    NASA Electronics Parts and Packaging program-funded activities over the past year on single-event effects in silicon and silicon carbide power devices are presented, with focus on SiC device failure signatures.

  2. Cobertura de Planos de Saúde na população brasileira, segundo a Pesquisa Nacional de Saúde, 2013

    Directory of Open Access Journals (Sweden)

    Deborah Carvalho Malta

    Full Text Available Resumo O objetivo do estudo é descrever as coberturas de planos de saúde no Brasil, conforme características sociodemográficas, a partir dos dados da Pesquisa Nacional de Saúde, realizada em 2013, e comparar com dados administrativos da Agencia Nacional de Saúde Suplementar para este mesmo ano. Foram utilizados dados da Pesquisa Nacional de Saúde e do Sistema de Informações de Beneficiários da Agência Nacional de Saúde para o ano de 2013. Foi descrita a cobertura dos planos de saúde segundo estratificação para Brasil, urbano/rural, Grandes Regiões, Unidades da Federação e Capitais, sexo, faixa etária, nível de instrução, posição na força de trabalho, cor/raça e estado de saúde. Como resultado, a proporção de pessoas que referiu ter algum plano de saúde no Brasil foi de 27,9% (IC95%: 27,1-28,8. Foi observada diferença significativa com relação a nível de instrução, sendo maior para os que referiram ter educação superior completa (68,8% IC95%: 67,2-70,4 e para aqueles que referiram ter ocupação (32,5% IC95%: 31,5-33,5. O aumento da cobertura de planos de saúde na população brasileira reflete a melhora da oferta de empregos e do crescimento da economia do país na época.

  3. Nas Trilhas (desconhecidas da saúde: a política pública de saúde para os homens no Brasil.

    Directory of Open Access Journals (Sweden)

    Marlene Neves Strey

    2012-11-01

    Full Text Available Neste estudo abordamos as diferentes formas de masculinidades e sua relação com a saúde, contempladas na Política de Atenção Integral à saúde do Homem (PNAISH implementada no Brasil no ano de 2009. Através de uma análise documental dessa política, pretendemos compreender os discursos masculinos que nela estão, bem como analisar a relação entre o discurso da política e as diferentes formas de produção de saúde. Devido a não estarem acostumados a se expor a um profissional de saúde, os homens sentem-se envergonhados, e além disso, atribuem sua baixa procura aos serviços de saúde, à falta de cuidados e escuta adequadas com um olhar de gênero que possa dar conta de suas demandas. Essa nova política de saúde para os homens criada no Brasil pretende atuar de maneira a atingir uma mudança cultural, que possibilite aos homens maior cuidado com sua saúde. Além disso, olhar para os modos de produção de masculinidades nos dias atuais e seus discursos sobre saúde é estar atento aos comportamentos que, devido à herança pautada nas diferenças entre os sexos, contribui para obstaculizar o acesso dos homens aos serviços de saúde.

  4. A política de saúde bucal em pauta no Conselho Municipal de Saúde no Município de Nova Friburgo - RJ

    Directory of Open Access Journals (Sweden)

    Rafael Gomes Ditterich

    Full Text Available Objetivo O presente estudo teve como objetivo analisar, por meio dos documentos técnicos do Conselho Municipal de Saúde (CMS, a organização dos serviços de saúde bucal no Município de Nova Friburgo - RJ, a partir da institucionalização da Política Nacional de Saúde Bucal. Metodologia Para a análise documental, utilizou-se o registro de frequência e categorização por assunto: saúde bucal das atas do CMS de junho/2006 a agosto/2011, do Plano Municipal de Saúde de 2003-2005 e 2010-2013, e os documentos encaminhados entre 2005 e 2011. Resultado Os registros analisados até 2012 indicaram que a população estava desassistida na questão da média complexidade, como também no acesso à água fluoretada. As equipes de saúde bucal ainda não tinham sido qualificadas e ampliadas, como é bem colocado como prioridade no Brasil Sorridente. O Município ainda não desenvolvia programas de prevenção e promoção de saúde bucal de forma contínua e efetiva. Conclusão Concluiu-se que a Política Nacional de Saúde Bucal, até o ano de 2012, não tinha ainda reflexo nas ações de saúde bucal em Nova Friburgo.

  5. Broadband Nonlinear Signal Processing in Silicon Nanowires

    DEFF Research Database (Denmark)

    Yvind, Kresten; Pu, Minhao; Hvam, Jørn Märcher;

    The fast non-linearity of silicon allows Tbit/s optical signal processing. By choosing suitable dimensions of silicon nanowires their dispersion can be tailored to ensure a high nonlinearity at power levels low enough to avoid significant two-photon abso We have fabricated low insertion and propa......The fast non-linearity of silicon allows Tbit/s optical signal processing. By choosing suitable dimensions of silicon nanowires their dispersion can be tailored to ensure a high nonlinearity at power levels low enough to avoid significant two-photon abso We have fabricated low insertion...... and propagation loss silicon nanowires and use them to demonstrate the broadband capabilities of silicon....

  6. New Perspective of High-Pure Silicon

    Institute of Scientific and Technical Information of China (English)

    2000-01-01

    @@The discovery in the middle of 1950s of the semi-con ducting properties of crystalline silicon has led to the impetu ous development of electric power facilities, the sun-power industry, and particularly, the microelectronic industry. The increasing demand for the high-pure silicon requires the production of synthetic crystals. The raw material for the syn thetic crystals, the so-called technical, or metallurgical silicon, is obtained from quartzite and quartz of superior quality by means of carbon-thermal reduction of silicon using an electric arc discharge. The complexity of the technological process, high cost of the related facilities, worsening environmental pollution, and narrow-mindedness of a raw material company are attributed to the rise in price of the final product-silicon plates, resulting in the fall in the production of high-pure silicon, normally used in sun storage batteries.

  7. Photodetectors on the Basis of Porous Silicon

    Directory of Open Access Journals (Sweden)

    I.B. Olenych

    2012-11-01

    Full Text Available The paper studies the electrical characteristics of photodiode structures porous siliconsilicon substrates modified with molecules of iodine. Changes the nature of current-voltage characteristics obtained structures with symmetrical for straightening result of adsorption of iodine are revealed. It is studied the spectral characteristics of photoresponse in the 450-1100 nm wavelength range, its temperature dependence in the 125-325 K range and energy characteristics of photovoltaic structures based on porous silicon. A possible mechanism of influence of iodine adsorption on the electrical and photoelectrical properties of the structures of porous siliconsilicon substrates is proposed. The results extend the perspectives of porous silicon in photoelectronics.

  8. Analytical and Experimental Evaluation of Joining Silicon Carbide to Silicon Carbide and Silicon Nitride to Silicon Nitride for Advanced Heat Engine Applications Phase II

    Energy Technology Data Exchange (ETDEWEB)

    Sundberg, G.J.

    1994-01-01

    Techniques were developed to produce reliable silicon nitride to silicon nitride (NCX-5101) curved joins which were used to manufacture spin test specimens as a proof of concept to simulate parts such as a simple rotor. Specimens were machined from the curved joins to measure the following properties of the join interlayer: tensile strength, shear strength, 22 C flexure strength and 1370 C flexure strength. In parallel, extensive silicon nitride tensile creep evaluation of planar butt joins provided a sufficient data base to develop models with accurate predictive capability for different geometries. Analytical models applied satisfactorily to the silicon nitride joins were Norton's Law for creep strain, a modified Norton's Law internal variable model and the Monkman-Grant relationship for failure modeling. The Theta Projection method was less successful. Attempts were also made to develop planar butt joins of siliconized silicon carbide (NT230).

  9. Signal development in irradiated silicon detectors

    CERN Document Server

    Kramberger, Gregor; Mikuz, Marko

    2001-01-01

    This work provides a detailed study of signal formation in silicon detectors, with the emphasis on detectors with high concentration of irradiation induced defects in the lattice. These defects give rise to deep energy levels in the band gap. As a consequence, the current induced by charge motion in silicon detectors is signifcantly altered. Within the framework of the study a new experimental method, Charge correction method, based on transient current technique (TCT) was proposed for determination of effective electron and hole trapping times in irradiated silicon detectors. Effective carrier trapping times were determined in numerous silicon pad detectors irradiated with neutrons, pions and protons. Studied detectors were fabricated on oxygenated and non-oxygenated silicon wafers with different bulk resistivities. Measured effective carrier trapping times were found to be inversely proportional to fuence and increase with temperature. No dependence on silicon resistivity and oxygen concentration was observ...

  10. Light Emission in Silicon from Carbon Nanotubes

    CERN Document Server

    Gaufrès, Etienne; Noury, Adrien; Roux, Xavier Le; Rasigade, Gilles; Beck, Alexandre; Vivien, Laurent

    2015-01-01

    The use of optics in microelectronic circuits to overcome the limitation of metallic interconnects is more and more considered as a viable solution. Among future silicon compatible materials, carbon nanotubes are promising candidates thanks to their ability to emit, modulate and detect light in the wavelength range of silicon transparency. We report the first integration of carbon nanotubes with silicon waveguides, successfully coupling their emission and absorption properties. A complete study of this coupling between carbon nanotubes and silicon waveguides was carried out, which led to the demonstration of the temperature-independent emission from carbon nanotubes in silicon at a wavelength of 1.3 {\\mu}m. This represents the first milestone in the development of photonics based on carbon nanotubes on silicon.

  11. Thermo-Mechanical Characterization of Silicon Carbide-Silicon Carbide Composites at Elevated Temperatures Using a Unique Combustion Facility

    Science.gov (United States)

    2009-09-10

    F THERMO-MECHANICAL CHARACTERIZATION OF SILICON CARBIDE - SILICON CARBIDE COMPOSITES AT ELEVATED...MECHANICAL CTERIZATION OF SILICON CARBIDE -SILIC BIDE COMPOSITES AT LEVATED TEMPER S USING A UNIQUE COMBUSTION FACILITY DISSERTATI N Ted T. Kim...THERMO-MECHANICAL CHARACTERIZATION OF SILICON CARBIDE - SILICON CARBIDE COMPOSITES AT ELEVATED TEMPERATURES USING A UNIQUE COMBUSTION FACILITY

  12. Mathematics teachers' beliefs about scientific approach (SA) and implementation in mathematics learning

    Science.gov (United States)

    Mutholib, Ahmad Abdul; Sujadi, Imam; Subanti, Sri

    2017-08-01

    SA is the approach used for the exploration of research and answer questions. Teachers' beliefs have a greater influence than the teacher's knowledge of designing lesson plans in the classroom. The objectives of this study are to explore the teachers' beliefs in SA, to reveal how the beliefs are reflected in classroom practices; and to figure out the factors affecting their beliefs and practices of SA to the teaching of mathematics. This qualitative research applied case study. The data was gained from classroom observation, face-to-face interview, and documentation. Interactive models from Miles and Huberman were used to examine the data. Results of the study: 1) The teachers believe about the conception of SA. They also believe that the SA is important and gives impact to students' progress. They believe that by applying SA, the target of mathematics learning is acquired. As to learning procedure, they believe that SA steps are conducted in sequence by combining some steps for each. 2) Teachers formulate their beliefs of applying the five scientific step of integrating all steps by keeping the sequence. Teachers argue that target of mathematics learning can be attained by some ways, namely presence of theoretical and practical support, teachers' guidance, providing variety of media and motivation to students. 3) There are five factors which influence teachers' beliefs and practices of SA, namely learning and teaching experience, teachers' motivation, sharing with colleagues and facility. This study concludes that teachers believe in the importance of SA, therefore they implement it in the classroom.

  13. The visualization of DHSI based on the relationship model of CL and SA

    Science.gov (United States)

    Wang, Haibo; Guo, Huijuan; Xue, Chengqi

    2013-03-01

    The source and cause of cognitive load (CL) and situation awareness (SA) in digital human-system interface (DHSI) is explained. Based on the analysis of cognitive procedure and the relation of CL and SA, The relationship model of CL and SA in DHSI is put forward. Using the association target and the relationship model of CL and SA, the method and strategy of information visualization of DHSI is presented which is based on the cognitive psychology. Selecting the Boeing 757 autopilot as the case, the comparison of design is shown.

  14. Software reference for SaTool - a Tool for Structural Analysis of Automated Systems

    DEFF Research Database (Denmark)

    Lorentzen, Torsten; Blanke, Mogens

    2004-01-01

    This software reference details the functions of SaTool – a tool for structural analysis of technical systems. SaTool is intended used as part of an industrial systems design cycle. Structural analysis is a graph-based technique where principal relations between variables express the system...... of the graph. SaTool makes analysis of the structure graph to provide knowledge about fundamental properties of the system in normal and faulty conditions. Salient features of SaTool include rapid analysis of possibility to diagnose faults and ability to make autonomous recovery should faults occur....

  15. Long-wavelength silicon photonic integrated circuits

    OpenAIRE

    2014-01-01

    In this paper we elaborate on our development of silicon photonic integrated circuits operating at wavelengths beyond the telecommunication wavelength window. Silicon-on-insulator waveguide circuits up to 3.8 mu m wavelength are demonstrated as well as germanium-on-silicon waveguide circuits operating in the 5-5 mu m wavelength range. The heterogeneous integration of III-V semiconductors and IV-VI semiconductors on this platform is described for the integration of lasers and photodetectors op...

  16. The Achievements and Challenges of Silicon Photonics

    Directory of Open Access Journals (Sweden)

    Richard Soref

    2008-01-01

    Full Text Available A brief overview of silicon photonics is given here in order to provide a context for invited and contributed papers in this special issue. Recent progress on silicon-based photonic components, photonic integrated circuits, and optoelectronic integrated circuits is surveyed. Present and potential applications are identified along with the scientific and engineering challenges that must be met in order to actualize applications. Some on-going government-sponsored projects in silicon optoelectronics are also described.

  17. Picosecond Pulse Laser Microstructuring of silicon

    Institute of Scientific and Technical Information of China (English)

    赵明; 尹钢; 朱京涛; 赵利

    2003-01-01

    We report the experimental results of picosecond pulse laser microstructuring (pulse duration 35ps, wavelength 1.06μm, repetition rate 10Hz) of silicon using the direct focusing technique. Arrays of sharp conical spikes located below the initial surface have been formed by cumulative picosecond pulsed laser irradiation of silicon in SF6. Irradiation of silicon surface in air, N2, or vacuum creates ripple-like patterns, but does not create the sharp conical spikes.

  18. Carbon nanofibers encapsulated in macropores in silicon

    Energy Technology Data Exchange (ETDEWEB)

    Starkov, V.; Red' kin, A. [Institute of Microelectronics Technology and High Purity Materials, RAS, Institutskaya str. 6, Chernogolovka 142432 (Russian Federation)

    2007-05-15

    This work reports on the development of fuel cells electrodes with a porous silicon structure and carbon nanofibers encapsulated in macropores in silicon. It is demonstrated that decomposition of carbon on a Ni catalyst deposited on the pore walls can be used to create a homogeneous carbon nanotube layer that dramatically increases the specific surface area while simultaneously reducing the resistivity of the macroporous silicon layer. (copyright 2007 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  19. Mid-infrared silicon photonic devices

    Science.gov (United States)

    Mashanovich, Goran Z.; Milosevic, Milan M.; Nedeljkovic, Milos; Owens, Nathan; Headley, William R.; Teo, Ee Jin; Xiong, Boqian; Yang, Pengyuan; Hu, Youfang

    2011-01-01

    The mid-infrared spectral region is interesting for bio-chemical sensing, environmental monitoring, free space communications, or military applications. Silicon is relatively low-loss from 1.2 to 8 μm and from 24 to 100 μm, and therefore silicon photonic circuits can be used in mid- and far- infrared wavelength ranges. In this paper we investigate several silicon based waveguide structures for mid-infrared wavelength region.

  20. Diamond-silicon carbide composite and method

    Science.gov (United States)

    Zhao, Yusheng

    2011-06-14

    Uniformly dense, diamond-silicon carbide composites having high hardness, high fracture toughness, and high thermal stability are prepared by consolidating a powder mixture of diamond and amorphous silicon. A composite made at 5 GPa/1673K had a measured fracture toughness of 12 MPam.sup.1/2. By contrast, liquid infiltration of silicon into diamond powder at 5 GPa/1673K produces a composite with higher hardness but lower fracture toughness.

  1. Silicon carbide sintered body manufactured from silicon carbide powder containing boron, silicon and carbonaceous additive

    Science.gov (United States)

    Tanaka, Hidehiko

    1987-01-01

    A silicon carbide powder of a 5-micron grain size is mixed with 0.15 to 0.60 wt% mixture of a boron compound, i.e., boric acid, boron carbide (B4C), silicon boride (SiB4 or SiB6), aluminum boride, etc., and an aluminum compound, i.e., aluminum, aluminum oxide, aluminum hydroxide, aluminum carbide, etc., or aluminum boride (AlB2) alone, in such a proportion that the boron/aluminum atomic ratio in the sintered body becomes 0.05 to 0.25 wt% and 0.05 to 0.40 wt%, respectively, together with a carbonaceous additive to supply enough carbon to convert oxygen accompanying raw materials and additives into carbon monoxide.

  2. A participação do enfermeiro de saúde pública na saúde familiar

    Directory of Open Access Journals (Sweden)

    Zélia Sena Costa

    1986-09-01

    Full Text Available As autoras partem do pressuposto de que o avanço da epidemiologia tem demonstrado que muitas enfermidades estão associadas a determinadas estruturas sociais. Face a um enfoque científico, humanístico e personalizado, o Enfermeiro tem conquistado um papel de destaque junto à família, uma vez que este grupo social se constitui em uma via estratégica para utilização de parâmetros psicossocias tendo em vista a função básica de ajuda e apoio. Considerando que a contribuição do Enfermeiro de Saúde Pública é de vital importância para a melhoria do nível de saúde familiar, concluem que existe uma necessidade premente da aplicação adequada do Processo de Enfermagem a nível familiar, propondo a inserção da concepção - unidade familiar - como princípio básico da Assistência de Enfermagem.

  3. Nano-ridge fabrication by local oxidation of silicon edges with silicon nitride as a mask

    NARCIS (Netherlands)

    Haneveld, Jeroen; Berenschot, Erwin; Maury, Pascale; Jansen, Henri

    2006-01-01

    A method to fabricate nano-ridges over a full wafer is presented. The fabrication method uses local oxidation of silicon, with silicon nitride as a mask, and wet anisotropic etching of silicon. The realized structures are 7–20 nm wide, 40–100 nm high and centimeters long. All dimensions are easily a

  4. Nano-ridge fabrication by local oxidation of silicon edges with silicon nitride as a mask

    NARCIS (Netherlands)

    Haneveld, Jeroen; Berenschot, Erwin; Maury, Pascale; Jansen, Henri

    2005-01-01

    A method to fabricate nano-ridges over a full wafer is presented. The fabrication method uses local oxidation of silicon, with silicon nitride as a mask, and wet anisotropic etching of silicon. The realized structures are 7-20 nm wide, 40-100 nm high and centimeters long. All dimensions are easily a

  5. Interstitial-type defects in implanted silicon

    Energy Technology Data Exchange (ETDEWEB)

    Berezhnov, N.I.; Stel' makh, V.F.; Chelyadinskij, A.R.

    1984-07-01

    Boron-, lithium-, phosphorus- and silicon-implanted silicon layers were investigated using X-ray diffraction method for measuring the crystal lattice parameters. It was established that stable interstitial complexes in concentrations comparable with concentrations of vacancy type defects occur in silicon as a result of ion implantation. The interstitial complexes are annealed at the following stages: 1 - 140, 2 - 500 deg C in the case of silicon irradiation by light ions and 1 - 180, 2 - 560 deg C in crystals irradiated by medium mass ions.

  6. Diffusivity in silicon 1953 to 2009

    CERN Document Server

    Fisher, David J

    2010-01-01

    This work is essentially an update of previous compilations of information on the diffusivity of elements in semiconductor-grade silicon. It subsumes the data contained in B.L.Sharma's monograph on 'Diffusion in Semiconductors' (Trans Tech Publications, 1970), plus the data contained in Diffusion and Defect Data (Diffusion in Silicon) Volume 45 (1986), Defect and Diffusion Forum (Diffusion in Silicon - 10 years of Research) Volumes 153-155 (1998), Defect and Diffusion Forum (Diffusion in Silicon - a Seven-Year Retrospective) Volume 241 (2005) and the latest data from recent Semiconductor Retro

  7. Simple Approach to Superamphiphobic Overhanging Silicon Nanostructures

    DEFF Research Database (Denmark)

    Kumar, Rajendra; Mogensen, Klaus Bo; Bøggild, Peter

    2010-01-01

    Superhydrophobic silicon nanostructures were fabricated by anisotropic etching of silicon coated with a thin hydrophobic layer. At certain etch parameters, overhanging nanostructures form at the apexes of the rod-shaped tips, This leads to superoleophobic behavior for several oily liquids...... with contact angles up to 152 degrees and roll-off angle down to 8 degrees. Such nonlithographic nanoscale overhanging Structures can also be added to silicon nanograss by deposition of a thin SiO2 layer, which equips the silicon rods with 100-300 nm sized overhanging Structures. This is a simple, fast...

  8. Silicon photonics for telecommunications and biomedicine

    CERN Document Server

    Fathpour, Sasan

    2011-01-01

    Given silicon's versatile material properties, use of low-cost silicon photonics continues to move beyond light-speed data transmission through fiber-optic cables and computer chips. Its application has also evolved from the device to the integrated-system level. A timely overview of this impressive growth, Silicon Photonics for Telecommunications and Biomedicine summarizes state-of-the-art developments in a wide range of areas, including optical communications, wireless technologies, and biomedical applications of silicon photonics. With contributions from world experts, this reference guides

  9. Mid-IR heterogeneous silicon photonics

    Science.gov (United States)

    Roelkens, Gunther; Dave, Utsav; Gassenq, Alban; Hattasan, Nannicha; Hu, Chen; Kuyken, Bart; Leo, Francois; Malik, Aditya; Muneeb, Muhammad; Ryckeboer, Eva; Uvin, Sarah; Hens, Zeger; Baets, Roel G.; Shimura, Yosuke; Gencarelli, Federica; Vincent, Benjamin; Loo, Roger; Van Campenhout, Joris; Cerutti, Laurent; Rodriguez, Jean-Baptiste; Tournié, Eric; Chen, Xia; Nedeljkovic, Milos; Mashanovich, Goran Z.; Shen, Li; Healy, Noel; Peacock, Anna C.; Liu, Xiaoping; Osgood, Richard M.; Green, William

    2013-12-01

    In this paper we discuss silicon-based photonic integrated circuit technology for applications beyond the telecommunication wavelength range. Silicon-on-insulator and germanium-on-silicon passive waveguide circuits are described, as well as the integration of III-V semiconductors, IV-VI colloidal nanoparticle films and GeSn alloys on these circuits for increasing the functionality. The strong nonlinearity of silicon combined with the low nonlinear absorption in the mid-infrared is exploited to generate picosecond pulse based supercontinuum sources and optical parametric oscillators that can be used as spectroscopic sensor sources.

  10. Silicon Micromachined Microlens Array for THz Antennas

    Science.gov (United States)

    Lee, Choonsup; Chattopadhyay, Goutam; Mehdi, IImran; Gill, John J.; Jung-Kubiak, Cecile D.; Llombart, Nuria

    2013-01-01

    5 5 silicon microlens array was developed using a silicon micromachining technique for a silicon-based THz antenna array. The feature of the silicon micromachining technique enables one to microfabricate an unlimited number of microlens arrays at one time with good uniformity on a silicon wafer. This technique will resolve one of the key issues in building a THz camera, which is to integrate antennas in a detector array. The conventional approach of building single-pixel receivers and stacking them to form a multi-pixel receiver is not suited at THz because a single-pixel receiver already has difficulty fitting into mass, volume, and power budgets, especially in space applications. In this proposed technique, one has controllability on both diameter and curvature of a silicon microlens. First of all, the diameter of microlens depends on how thick photoresist one could coat and pattern. So far, the diameter of a 6- mm photoresist microlens with 400 m in height has been successfully microfabricated. Based on current researchers experiences, a diameter larger than 1-cm photoresist microlens array would be feasible. In order to control the curvature of the microlens, the following process variables could be used: 1. Amount of photoresist: It determines the curvature of the photoresist microlens. Since the photoresist lens is transferred onto the silicon substrate, it will directly control the curvature of the silicon microlens. 2. Etching selectivity between photoresist and silicon: The photoresist microlens is formed by thermal reflow. In order to transfer the exact photoresist curvature onto silicon, there needs to be etching selectivity of 1:1 between silicon and photoresist. However, by varying the etching selectivity, one could control the curvature of the silicon microlens. The figure shows the microfabricated silicon microlens 5 x5 array. The diameter of the microlens located in the center is about 2.5 mm. The measured 3-D profile of the microlens surface has a

  11. Engineering piezoresistivity using biaxially strained silicon

    DEFF Research Database (Denmark)

    Pedersen, Jesper Goor; Richter, Jacob; Brandbyge, Mads;

    2008-01-01

    We calculate the shear piezocoefficient of p-type silicon with grown-in biaxial strain using a 66 k·p method. We find a significant increase in the value of the shear piezocoefficient for compressive grown-in biaxial strain, while tensile strain decreases the piezocoefficient. The dependence...... of the piezocoefficient on temperature and dopant density is altered qualitatively for strained silicon. In particular, we find that a vanishing temperature coefficient may result for silicon with grown-in biaxial tensile strain. These results suggest that strained silicon may be used to engineer the iezoresistivity...

  12. ELECTRON BOMBARDMENT OF SILICON SOLAR CELLS,

    Science.gov (United States)

    DAMAGE, ELECTRON IRRADIATION, SOLAR CELLS , SILICON, PHOTOELECTRIC CELLS(SEMICONDUCTOR), QUARTZ, GLASS, SHIELDING, CRYSTAL DEFECTS, HEAT TREATMENT, ARTIFICIAL SATELLITES, SPACECRAFT, GRAPHICS, GRAPHICS.

  13. Activation of silicon quantum dots for emission

    Institute of Scientific and Technical Information of China (English)

    Huang Wei-Qi; Miao Xin-Jian; Huang Zhong-Mei; Liu Shi-Rong; Qin Chao-Jian

    2012-01-01

    The emission of silicon quantum dots is weak when their surface is passivated well. Oxygen or nitrogen on the surface of silicon quantum dots can break the passivation to form localized electronic states in the band gap to generate active centers where stronger emission occurs.From this point of view,we can build up radiative matter for emission.Emissions of various wavelengths can be obtained by controlling the surface bonds of silicon quantum dots.Our experimental results demonstrate that annealing is important in the treatment of the activation,and stimulated emissions at about 600 and 700 nm take place on active silicon quantum dots.

  14. Silicon infrared diffuser for wireless communication

    Science.gov (United States)

    Massera, Ettore; Rea, Ilaria; Nasti, Ivana; Maddalena, Pasqualino; di Francia, Girolamo

    2006-09-01

    We show what we believe to be a novel way to use silicon in infrared radio communication as a suitable material for the realization of optical diffusers in the range of 850-1600 nm. A crystalline silicon wafer is made porous by means of electrochemical etching. The porous silicon produced is optically characterized, and measurements report a high reflectance in the band of interest. We also study the angular distribution of diffused radiation by the porous silicon surface at different angles of incident radiation. Measurements show that radiation diffuses in a quasi-Lambertian manner, confirming the good performance of this material as an incident radiation diffuser.

  15. Silicon solid state devices and radiation detection

    CERN Document Server

    Leroy, Claude

    2012-01-01

    This book addresses the fundamental principles of interaction between radiation and matter, the principles of working and the operation of particle detectors based on silicon solid state devices. It covers a broad scope with respect to the fields of application of radiation detectors based on silicon solid state devices from low to high energy physics experiments including in outer space and in the medical environment. This book covers stateof- the-art detection techniques in the use of radiation detectors based on silicon solid state devices and their readout electronics, including the latest developments on pixelated silicon radiation detector and their application.

  16. Radiation experience with the CDF silicon detectors

    Energy Technology Data Exchange (ETDEWEB)

    Husemann, Ulrich; /Rochester U.

    2005-11-01

    The silicon detectors of the CDF experiment at the Tevatron collider are operated in a harsh radiation environment. The lifetime of the silicon detectors is limited by radiation damage, and beam-related incidents are an additional risk. This article describes the impact of beam-related incidents on detector operation and the effects of radiation damage on electronics noise and the silicon sensors. From measurements of the depletion voltage as a function of the integrated luminosity, estimates of the silicon detector lifetime are derived.

  17. Raman Amplifier Based on Amorphous Silicon Nanoparticles

    Directory of Open Access Journals (Sweden)

    M. A. Ferrara

    2012-01-01

    Full Text Available The observation of stimulated Raman scattering in amorphous silicon nanoparticles embedded in Si-rich nitride/silicon superlattice structures (SRN/Si-SLs is reported. Using a 1427 nm continuous-wavelength pump laser, an amplification of Stokes signal up to 0.9 dB/cm at 1540.6 nm and a significant reduction in threshold power of about 40% with respect to silicon are experimentally demonstrated. Our results indicate that amorphous silicon nanoparticles are a great promise for Si-based Raman lasers.

  18. Combination of silicon nitride and porous silicon induced optoelectronic features enhancement of multicrystalline silicon solar cells

    Energy Technology Data Exchange (ETDEWEB)

    Rabha, Mohamed Ben; Dimassi, Wissem; Gaidi, Mounir; Ezzaouia, Hatem; Bessais, Brahim [Laboratoire de Photovoltaique, Centre de Recherches et des Technologies de l' Energie, Technopole de Borj-Cedria, BP 95, 2050 Hammam-Lif (Tunisia)

    2011-06-15

    The effects of antireflection (ARC) and surface passivation films on optoelectronic features of multicrystalline silicon (mc-Si) were investigated in order to perform high efficiency solar cells. A double layer consisting of Plasma Enhanced Chemical Vapor Deposition (PECVD) of silicon nitride (SiN{sub x}) on porous silicon (PS) was achieved on mc-Si surfaces. It was found that this treatment decreases the total surface reflectivity from about 25% to around 6% in the 450-1100 nm wavelength range. As a result, the effective minority carrier diffusion length, estimated from the Laser-beam-induced current (LBIC) method, was found to increase from 312 {mu}m for PS-treated cells to about 798 {mu}m for SiN{sub x}/PS-treated ones. The deposition of SiN{sub x} was found to impressively enhance the minority carrier diffusion length probably due to hydrogen passivation of surface, grain boundaries and bulk defects. Fourier Transform Infrared Spectroscopy (FTIR) shows that the vibration modes of the highly suitable passivating Si-H bonds exhibit frequency shifts toward higher wavenumber, depending on the x ratio of the introduced N atoms neighbors. (copyright 2011 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim) (orig.)

  19. O conceito de saúde The health's concept

    Directory of Open Access Journals (Sweden)

    Marco Segre

    1997-10-01

    Full Text Available Questiona-se a atual definição de saúde da Organização Mundial da Saúde: "situação de perfeito bem-estar físico, mental e social" da pessoa, considerada ultrapassada, primeiramente, por visar a uma perfeição inatingível, atentando-se as próprias características da personalidade. Menciona-se como principal sustentação dessa idéia, a renúncia necessária a parte da liberdade pulsional do homem, em troca da menor insegurança propiciada pelo convívio social. Discute-se a validade da distincão entre soma, psique e sociedade, esposando o conceito de homem "integrado", e registrando situações em que a interação entre os três aspectos citados é absolutamente cristalina. É revista a noção de qualidade de vida sob um vértice antipositivista. Essa priorização e proposta de resgate do subjetivismo, reverte a um questionamento da atual definição de saúde, toda ela embasada em avaliações externas, "objetivas", dessa situação.Objections to the present WHO (World Health Organization definition of HEALTH, as "the state of perfect physical, mental and social well-being", are expressed. It is considered to be anachronistic, first because it aims at perfection which is unaltainelle because of distict personality characteristics. As the main support for this idea, the necessary renunciation of part of man's drive to liberty in exchange for the lesser insecurity provided by social life (Freud, Castoriadis and Mc Dougall, is groted. The validity of distinguishing between "soma", "psyche" and "society" is questioned and the concept of the "integrated man", alluding to Pierre Marty and to Freud himself is adapted, and situations are recalled in which the interaction of the three aspects mentioned above is actually evident. Finally, the notion of the quality of life, in accordance with an antipositivistic taken from Bion, point of view, is discussed, and the concept that reality is that of each human being, is adapted. This

  20. Hyperdoping silicon with selenium: solid vs. liquid phase epitaxy

    OpenAIRE

    Zhou, Shengqiang; Liu, Fang; Prucnal, S.; Gao, Kun; Khalid, M.; Baehtz, C.; Posselt, M.; Skorupa, W.; Helm, M

    2015-01-01

    Chalcogen-hyperdoped silicon shows potential applications in silicon-based infrared photodetectors and intermediate band solar cells. Due to the low solid solubility limits of chalcogen elements in silicon, these materials were previously realized by femtosecond or nanosecond laser annealing of implanted silicon or bare silicon in certain background gases. The high energy density deposited on the silicon surface leads to a liquid phase and the fast recrystallization velocity allows trapping o...

  1. Using silicon to enhance rice anther culture efficiency

    Institute of Scientific and Technical Information of China (English)

    LIUBaoshen; CHENCuixia; YINLiqing; ZHANGJianjun

    1997-01-01

    Silicon is one of essential elements for rice growth. Deficiency of silicon in plants would affect the physiological metabolism of rice.Considering the important role of silicon to rice and no silicon being used in ordinary anther culture medium, we added absorbable silicon at different concentrations into either or both in-duction media (IM), differentiation media(DM) to study the effect of silicon on anther culture efficiency.

  2. Silicon-on-ceramic process: Silicon sheet growth and device development for the large-area silicon sheet task of the low-cost solar array project

    Science.gov (United States)

    Whitehead, A. B.; Zook, J. D.; Grung, B. L.; Heaps, J. D.; Schmit, F.; Schuldt, S. B.; Chapman, P. W.

    1981-01-01

    The technical feasibility of producing solar cell quality sheet silicon to meet the DOE 1986 cost goal of 70 cents/watt was investigated. The silicon on ceramic approach is to coat a low cost ceramic substrate with large grain polycrystalline silicon by unidirectional solidification of molten silicon. Results and accomplishments are summarized.

  3. Polycrystalline silicon study: Low-cost silicon refining technology prospects and semiconductor-grade polycrystalline silicon availability through 1988

    Science.gov (United States)

    Costogue, E. N.; Ferber, R.; Lutwack, R.; Lorenz, J. H.; Pellin, R.

    1984-01-01

    Photovoltaic arrays that convert solar energy into electrical energy can become a cost effective bulk energy generation alternative, provided that an adequate supply of low cost materials is available. One of the key requirements for economic photovoltaic cells is reasonably priced silicon. At present, the photovoltaic industry is dependent upon polycrystalline silicon refined by the Siemens process primarily for integrated circuits, power devices, and discrete semiconductor devices. This dependency is expected to continue until the DOE sponsored low cost silicon refining technology developments have matured to the point where they are in commercial use. The photovoltaic industry can then develop its own source of supply. Silicon material availability and market pricing projections through 1988 are updated based on data collected early in 1984. The silicon refining industry plans to meet the increasing demands of the semiconductor device and photovoltaic product industries are overviewed. In addition, the DOE sponsored technology research for producing low cost polycrystalline silicon, probabilistic cost analysis for the two most promising production processes for achieving the DOE cost goals, and the impacts of the DOE photovoltaics program silicon refining research upon the commercial polycrystalline silicon refining industry are addressed.

  4. 美国SA8000标准介绍

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    20世纪末期,欧洲、美国和澳大利亚都先后出现了一些关于“企业社会责任”的多边组织,并逐步形成了一些评价体系和认证制度。SA8000(Social Accoutability 8000的英文简称)是其中最有名的标准之一。企业社会责任是指企业在赚取利润的同时,主动承担对环境、社会和利益相关者的

  5. Impacto da microbiota intestinal na saúde mental

    OpenAIRE

    Landeiro, Joana Almeida Vilão Raposo

    2016-01-01

    Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz A microbiota intestinal consiste no conjunto de microrganismos residentes no intestino humano e que é responsável pela execução de diversas funções, sendo essencial para a manutenção da homeostase. Esta encontra-se em comunicação com o sistema nervoso central através do eixo intestino-cérebro, sendo esta comunicação bidirecional. Vários estudos têm revelado que a microbiota intestinal influenc...

  6. Editorial challenges of the Revista de Saúde Pública.

    Science.gov (United States)

    Antunes, José Leopoldo Ferreira; França Júnior, Ivan; de Andrade, Maria Teresinha Dias; Barata, Rita de Cássia Barradas; Monteiro, Carlos Augusto

    2015-07-01

    The editors of the Revista de Saúde Pública describe the journal's editorial profile and discuss the challenges of scientific publication in the area. A historical overview of almost 50 years of the journal is reported, with the temporal projection of their bibliometric indicators. Qualitative and quantitative parameters of its editorial profile and indexes are also reported. Budget constraints and the actions being taken to address them are discussed. The difficulty in allocating reviewers for manuscripts submitted to the editorial process is also discussed; an issue that affects scientific publication in many areas of knowledge. In particular, we sought to reflect on the proposal of measures to boost the editorial process by alleviating the shortage of reviewers and their possible harmful consequences for the editorial process.

  7. STRATEGI PENINGKATAN DAYA SAING RUMAH POTONG AYAM PT XYZ

    Directory of Open Access Journals (Sweden)

    Arli Arli

    2012-07-01

    chicken-based food company in Indonesia.Keywords:  competitiveness, global value chain, poultry slaughterhouse, PT XYZABSTRAKTujuan penelitian ini adalah (1 menganalisis peran aktor-aktor di dalam rantai nilai Rumah Potong Ayam (RPA PT XYZ  yang berpengaruh terhadap daya saingnya, (2 menganalisis para pemain kunci dalam stakeholders RPA PT XYZ , (3 menganalisis faktor-faktor internal dan eksternal (IE yang berpengaruh terhadap daya saing RPA PT XYZ , (4 memformulasikan tujuan dan sasaran jangka panjang strategik untuk meningkatkan daya saing RPA PT XYZ , (5 menganalisis alternatif dan prioritas strategi untuk meningkatkan daya saing RPA PT XYZ . Metode yang digunakan adalah analisis deskriptif. Analisis yang digunakan adalah global value chain, analisis stakeholder, internal factor evaluation, external factor evaluation, matriks IE, SWOT, dan quantitative strategic planning matrix. Hasil dari analisis global value chain, analisis stakeholders, analisis internal dan eksternal, dan visi-misi perusahaan, tujuan jangka panjang adalah (a menyediakan nilai tambah bagi pelanggan, (b memaksimalkan laba dari hasil operasi bisnis, (c meningkatkan kesejahteraan stakeholders, (d melakukan kegiatan sustainable business. Hasil matriks IE dan analisis SWOT, strategi untuk mencapai sasaran dan tujuan jangka panjang strategik adalah (a meningkatkan efektivitas dan efisiensi manajemen rantai pasok; (b mengimplementasikan evaluasi kinerja untuk pegawai dan partner bisnis; (c memperkuat  citra sebagai perusahaan domestik penghasil makanan olahan berbasis daging ayam berkualitas tinggi di Indonesia; (d meningkatkan kegiatan penelitian dan pengembangan; (e membangun aliansi strategik dengan pemasok ayam hidup eksternal; (f melakukan sosialisasi mengenai pentingnya konsumsi protein hewani kepada masyarakat Indonesia. Tiga strategi prioritas dari analisis QSPM adalah meningkatkan efektivitas dan efisiensi rantai pasok, mengimplementasikan evaluasi kinerja untuk pegawai dan partner bisnis, dan

  8. Saúde mental: reconstruindo saberes em enfermagem

    Directory of Open Access Journals (Sweden)

    Francisca Bezerra de Oliveira

    2003-02-01

    Full Text Available O manicômio, apesar de criticado, reformado ou mesmo negado, ainda é uma prática preponderante no cuidado às pessoas com transtornos mentais. Tal prática tem como princípio básico o isolamento do doente mental, contrariando todas as possibilidades de assistência centrada num humanismo ético. Este ensaio procura interpretar a institucionalização do asilo, da psiquiatria, da doença mental e o processo da reforma psiquiátrica, buscando contribuir para as reflexões acerca da desinstitucionalização e dos saberes e práticas de enfermagem em saúde mental.

  9. SalSA: A Teraton UHE Neutrino Detector

    Energy Technology Data Exchange (ETDEWEB)

    Reil, Kevin; /SLAC

    2006-04-19

    The observed spectrum of ultra-high energy cosmic rays virtually guarantees the presence of ultra-high energy neutrinos due to their interaction with the cosmic microwave background. Unlike cosmic rays, each of these neutrinos will point back directly to its source and will arrive at the Earth unattenuated, from sources perhaps as distant as z = 20. The neutrino telescopes currently under construction, should discover a handful of these events, probably too few for detailed study. This paper describes how an array of VHF and UHF antennas embedded in a large salt dome, SalSA (Salt dome Shower Array) promises to yield a teraton detector (> 500 km{sup 3 sr}) for contained neutrino events with energies above 10{sup 17} eV. Our simulations show that such a detector may observe several hundreds of these neutrinos over its lifetime with excellent angular resolution providing source locations.

  10. Teaching Computer System-DMT DESIGN(SA.1

    Directory of Open Access Journals (Sweden)

    A. O. Shteynberg

    2012-01-01

    Full Text Available Тhe paper introduces the training computer system of sub- agential type based on a didactic multidimensional technology. The methodology bases incorporate the systematic activity approach, some elements of artificial intelligence theory, and the instrumental didactic theory and technology developed by Scientific Experimental Laboratory at Bashkirsky State Pedagogical University. The above training system – Didactic Multidimensional Technology Design of Sub-Agential Type (DMT_DESIGN (SA.1 – has been developed for raising teachers’ technological competence and creativity regarding both the general and vocational education. Its training structure is specified by invariant socio-cultural and anthropological bases; logically semantic modeling of course materials is provided. The research data can be used by people, engaged in developing educational information technologies; practicing teachers; and post-graduates conducting research and implementing the findings. 

  11. Bien communiquer sur sa thèse, suite.

    Directory of Open Access Journals (Sweden)

    Philippe Heller

    2005-07-01

    Full Text Available Après une brève présentation sur lui-même, Edouard Paulino du Craft (Centre de recherche et d’appui pour la formation et ses technologies, qui travaille à l’ Epfl lance le débat : que signifie communiquer sur sa thèse ? Parmi le petit auditoire de doctorants présents, les questions-réponses fusent : à qui s’adresse-t-on ? Pourquoi ? Comment s’adapter à son auditoire ? Mais en fait qu’est-ce que communiquer ? Doit-on suivre forcément son plan de thèse ou ...

  12. MENDORONG PASAR MODAL EFISIEN DAN BERDAYA SAING GLOBAL

    Directory of Open Access Journals (Sweden)

    Satia Nur Maharani

    2006-01-01

    Full Text Available Globalisasi semakin memperpendek jarak dan waktu. Kemampuannya mampu  merubah wajah planet bumi menjadi” just a small village “ melalui peningkatan ilmu pengetahuan dan teknologi. Perubahan tersebut bertransformasi pula pada  sistem ekonomi. Modal berdiri sendiri tanpa identitas dan siapa saja berhak untuk berinvestasi tanpa batas melalui sebuah mekanisme antar negara dan benua. Salah satu lintasan modal untuk meraih keuntungan adalah melalui mekanisme pasar modal. Pasar modal manakah yang diminati oleh arus modal masuk adalah pasar modal yang mampu memberikan jamuan terbaik berupa keuntungan yang tinggi dengan resiko yang optimal. Maka untuk mencapai pelayan yang maksimal bagi masyarakat pemodal , pasar modal harus efisien dan berdaya saing global. Maka keterbukaan informasi, peningkatan teknologi, efisiensi biaya penegakan hukum, partisipasi masyarakat dan pemerintah, inovasi produk mutlak untuk dievaluasi dan ditingkatkan

  13. Emerging heterogeneous integrated photonic platforms on silicon

    Directory of Open Access Journals (Sweden)

    Fathpour Sasan

    2015-05-01

    Full Text Available Silicon photonics has been established as a mature and promising technology for optoelectronic integrated circuits, mostly based on the silicon-on-insulator (SOI waveguide platform. However, not all optical functionalities can be satisfactorily achieved merely based on silicon, in general, and on the SOI platform, in particular. Long-known shortcomings of silicon-based integrated photonics are optical absorption (in the telecommunication wavelengths and feasibility of electrically-injected lasers (at least at room temperature. More recently, high two-photon and free-carrier absorptions required at high optical intensities for third-order optical nonlinear effects, inherent lack of second-order optical nonlinearity, low extinction ratio of modulators based on the free-carrier plasma effect, and the loss of the buried oxide layer of the SOI waveguides at mid-infrared wavelengths have been recognized as other shortcomings. Accordingly, several novel waveguide platforms have been developing to address these shortcomings of the SOI platform. Most of these emerging platforms are based on heterogeneous integration of other material systems on silicon substrates, and in some cases silicon is integrated on other substrates. Germanium and its binary alloys with silicon, III–V compound semiconductors, silicon nitride, tantalum pentoxide and other high-index dielectric or glass materials, as well as lithium niobate are some of the materials heterogeneously integrated on silicon substrates. The materials are typically integrated by a variety of epitaxial growth, bonding, ion implantation and slicing, etch back, spin-on-glass or other techniques. These wide range of efforts are reviewed here holistically to stress that there is no pure silicon or even group IV photonics per se. Rather, the future of the field of integrated photonics appears to be one of heterogenization, where a variety of different materials and waveguide platforms will be used for

  14. Crystal growth and evaluation of silicon for VLSI and ULSI

    CERN Document Server

    Eranna, Golla

    2014-01-01

    PrefaceAbout the AuthorIntroductionSilicon: The SemiconductorWhy Single CrystalsRevolution in Integrated Circuit Fabrication Technology and the Art of Device MiniaturizationUse of Silicon as a SemiconductorSilicon Devices for Boolean ApplicationsIntegration of Silicon Devices and the Art of Circuit MiniaturizationMOS and CMOS Devices for Digital ApplicationsLSI, VLSI, and ULSI Circuits and ApplicationsSilicon for MEMS ApplicationsSummaryReferencesSilicon: The Key Material for Integrated Circuit Fabrication TechnologyIntroductionPreparation of Raw Silicon MaterialMetallurgical-Grade SiliconPuri

  15. Silicon assistant carbothermal reduction for SiC powders

    Institute of Scientific and Technical Information of China (English)

    Kezhi Li; Jian Wei; Hejun Li; Chuang Wang; Gengsheng Jiao

    2008-01-01

    The silicon assistant method to increase the reaction yield of carbothermal reduction of silica at a lower temperature is reported. The effect of silicon on the carbothermal reduction process has been investigated in detail. Compared with traditional reduction, the introduction of silicon can change the reaction path and further increase the conversion of silicon carbide at a lower temperature. It is considered that the assistant reduction consists of three steps: vaporizing and melting of silicon, formation of silicon monoxide, and synthesis of silicon carbide. The morphology of the synthesized SiC powders through the silicon assistant method can be affected apparently by the experimental temperature.

  16. Comunicação entre usuários e trabalhadores de saúde em colegiados de Saúde da Família

    Directory of Open Access Journals (Sweden)

    Marcelen Palu Longhi

    2013-02-01

    Full Text Available Atualmente, têm sido observados problemas relativos à comunicação nos fóruns de participação social da saúde. O presente estudo tem o objetivo de analisar a comunicação entre usuários e trabalhadores de saúde, em colegiados da Saúde da Família. O referencial teórico utilizado foi a Teoria da Ação Comunicativa de Habermas. Realizou-se uma pesquisa qualitativa. Os dados coletados revelaram duas dimensões que se entrelaçavam: distanciamentos e aproximações entre usuários e trabalhadores de saúde. Quanto aos distanciamentos, destacaram-se a presença de relações assimétricas, de coerção e de manipulação por parte dos trabalhadores de saúde, processos que prejudicam a participação dos usuários. Por outro lado, estiveram presentes momentos de interação e lutas por direitos, abordados nas aproximações entre usuários e trabalhadores de saúde. Por fim, consideramos que a comunicação nos colegiados da Saúde da Família apresenta potencialidades e limites, sendo que estes devem ser problematizados, especialmente, por meio da educação permanente em saúde.

  17. 企业社会责任与SA8000

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    国际市场正逐渐认可的一种新兴的标准体系——SA8000(Social Accoutability 8000,社会责任标准8000),社会责任国际(Social Accountability International,简称SAI)是SA8000标准(即社会责任标准)的制订和执行机构,其前身为1997年成立的美国经济优先认可委员会(CEPAA),总都设在美国纽约,2001年该组织更改为现名。这个全球首个对企业进行道德规范的标准自1997年问世以来,受到了公众极大的关注,如同ISO9000、ISO14000、HACCP等标准体系,已成为国际市场的“通行证”。尽管国内对这个标准还有不同意见,但是通过规范的制度化的约束机制来推动企业社会责任建设,是一个必然的趋势。海尔集团首席执行官张瑞敏说;“责任和利润不是博弈关系。人们对百年老店做过调查,他们都倡导社会责任第一,利益、利润第二。”(以下中译文仅供参考)

  18. The STAR silicon vertex tracker: a large area silicon drift detector

    CERN Document Server

    Lynn, D; Beuttenmüller, Rolf H; Caines, H; Chen, W; Dimassimo, D; Dyke, H; Elliot, D; Eremin, V; Grau, M; Hoffmann, G W; Humanic, T; Ilyashenko, Yu S; Kotov, I; Kraner, H W; Kuczewski, P; Leonhardt, B; Li, Z; Liaw, C J; Lo Curto, G; Middelkamp, P; Minor, R; Munhoz, M; Ott, G; Pandey, S U; Pruneau, C A; Rykov, V L; Schambach, J; Sedlmeir, J; Soja, B; Sugarbaker, E R; Takahashi, J; Wilson, K; Wilson, R

    2000-01-01

    The Solenoidal Tracker At RHIC-Silicon Vertex Tracker (STAR-SVT) is a three barrel microvertex detector based upon silicon drift detector technology. As designed for the STAR-SVT, silicon drift detectors (SDDs) are capable of providing unambiguous two-dimensional hit position measurements with resolutions on the order of 20 mu m in each coordinate. Achievement of such resolutions, particularly in the drift direction coordinate, depends upon certain characteristics of silicon and drift detector geometry that are uniquely critical for silicon drift detectors hit measurements. Here we describe features of the design of the STAR-SVT SDDs and the front-end electronics that are motivated by such characteristics.

  19. Saúde mental na Estratégia Saúde da Família: a avaliação de apoio matricial

    Directory of Open Access Journals (Sweden)

    Fernanda Barreto Mielke

    2010-12-01

    Full Text Available O objetivo deste artigo é avaliar o apoio matricial na perspectiva de 14 profissionais de uma unidade de saúde da família em um estudo avaliativo qualitativo realizado a partir da Avaliação de Quarta Geração. Os dados foram coletados por meio de observação e entrevistas e analisados pelo Método Comparativo Constante, enfocando a inclusão de ações de saúde mental na Estratégia Saúde da Família. Os profissionais das equipes estudadas avaliaram a necessidade de retaguarda assistencial e orientações técnicas de equipes especializadas em saúde mental para a realização de ações de saúde mental no território, o que poderia ser implementado por meio do apoio matricial. Avaliamos que este arranjo organizacional é importante na construção de ações de saúde mental no território.

  20. Homossexualidade e o direito à saúde: um desafio para as políticas públicas de saúde no Brasil

    Directory of Open Access Journals (Sweden)

    Grayce Alencar Albuquerque

    Full Text Available Objetivou-se evidenciar a atuação das políticas públicas direcionadas à saúde da população homossexual brasileira. Trata-se de uma revisão integrativa da literatura, realizada na Scientific Eletronic Library Online (SciELO e na Literatura Latino-Americana e do Caribe em Ciências da Saúde (Lilacs, utilizando os Decs: políticas públicas, assistência integral à saúde e homossexualidade. A saúde LGBT é apontada como vulnerável mesmo após a publicação de importantes documentos que garantem o acesso e a inclusão do grupo na saúde. A fragilidade na efetivação das propostas preconizadas vão ao encontro ao atendimento discriminatório e heteronormativo prestado pelos profissionais de saúde.

  1. A música popular brasileira na construção do conhecimento em Saúde Pública: o tema processo de trabalho e saúde

    Directory of Open Access Journals (Sweden)

    José Augusto Pina

    2014-01-01

    Full Text Available Este estudo destaca temas relativos ao trabalho e à saúde na música popular brasileira, especialmente no samba. Tem como objetivo apresentar um corpo de conhecimentos sobre o tema processo de trabalho e saúde. Nas canções selecionadas foram identificadas categorias tomadas como ponto de partida para discussão com a literatura. Com o desenvolvimento do texto, percebe-se o manancial da canção popular para proporcionar conteúdos sobre múltiplas dimensões do processo de trabalho e do processo saúde-doença dos trabalhadores, inclusive a dimensão coletiva e histórica da luta pelo direito à saúde. Esta pesquisa resultou na valorização da música popular brasileira como uma forma de se entenderem as relações trabalho-saúde e de se desenvolver conhecimento em Saúde Coletiva.

  2. Percepções e atuação do Agente Comunitário de Saúde em saúde mental

    Directory of Open Access Journals (Sweden)

    Maria Angélica Pagliarini Waidman

    2012-10-01

    Full Text Available Este estudo teve como objetivo identificar as percepções de Agentes Comunitários de Saúde acerca de saúde e transtorno mental, bem como verificar o preparo desses agentes para atuar na área. Trata-se de uma pesquisa qualitativa que utilizou como técnica de coleta de dados a entrevista semiestruturada e, para interpretação dos dados, a técnica de análise de conteúdo. Foram entrevistados 45 Agentes Comunitários de Saúde da Estratégia Saúde da Família, pertencentes às 21 unidades básicas de saúde do município de Maringá, PR. Os resultados obtidos demonstram os preconceitos em relação ao transtorno mental desses profissionais, que reconhecem a importância de se trabalhar tanto com o portador quanto com a família, mas não se sentem capacitados para prestar uma assistência adequada. Por compartilharem o mesmo contexto social e por conhecerem de perto a dinâmica da comunidade, vislumbramos os agentes como importantes facilitadores no cuidado à saúde mental.

  3. Amorphous silicon carbide passivating layers for crystalline-silicon-based heterojunction solar cells

    Energy Technology Data Exchange (ETDEWEB)

    Boccard, Mathieu; Holman, Zachary C. [School of Electrical, Computer, and Energy Engineering, Arizona State University, Tempe, Arizona 85287-5706 (United States)

    2015-08-14

    Amorphous silicon enables the fabrication of very high-efficiency crystalline-silicon-based solar cells due to its combination of excellent passivation of the crystalline silicon surface and permeability to electrical charges. Yet, amongst other limitations, the passivation it provides degrades upon high-temperature processes, limiting possible post-deposition fabrication possibilities (e.g., forcing the use of low-temperature silver pastes). We investigate the potential use of intrinsic amorphous silicon carbide passivating layers to sidestep this issue. The passivation obtained using device-relevant stacks of intrinsic amorphous silicon carbide with various carbon contents and doped amorphous silicon are evaluated, and their stability upon annealing assessed, amorphous silicon carbide being shown to surpass amorphous silicon for temperatures above 300 °C. We demonstrate open-circuit voltage values over 700 mV for complete cells, and an improved temperature stability for the open-circuit voltage. Transport of electrons and holes across the hetero-interface is studied with complete cells having amorphous silicon carbide either on the hole-extracting side or on the electron-extracting side, and a better transport of holes than of electrons is shown. Also, due to slightly improved transparency, complete solar cells using an amorphous silicon carbide passivation layer on the hole-collecting side are demonstrated to show slightly better performances even prior to annealing than obtained with a standard amorphous silicon layer.

  4. Process for making silicon carbide reinforced silicon carbide composite

    Science.gov (United States)

    Lau, Sai-Kwing (Inventor); Calandra, Salavatore J. (Inventor); Ohnsorg, Roger W. (Inventor)

    1998-01-01

    A process comprising the steps of: a) providing a fiber preform comprising a non-oxide ceramic fiber with at least one coating, the coating comprising a coating element selected from the group consisting of carbon, nitrogen, aluminum and titanium, and the fiber having a degradation temperature of between 1400.degree. C. and 1450.degree. C., b) impregnating the preform with a slurry comprising silicon carbide particles and between 0.1 wt % and 3 wt % added carbon c) providing a cover mix comprising: i) an alloy comprising a metallic infiltrant and the coating element, and ii) a resin, d) placing the cover mix on at least a portion of the surface of the porous silicon carbide body, e) heating the cover mix to a temperature between 1410.degree. C. and 1450.degree. C. to melt the alloy, and f) infiltrating the fiber preform with the melted alloy for a time period of between 15 minutes and 240 minutes, to produce a ceramic fiber reinforced ceramic composite.

  5. Compositional analysis of silicon oxide/silicon nitride thin films

    Directory of Open Access Journals (Sweden)

    Meziani Samir

    2016-06-01

    Full Text Available Hydrogen, amorphous silicon nitride (SiNx:H abbreviated SiNx films were grown on multicrystalline silicon (mc-Si substrate by plasma enhanced chemical vapour deposition (PECVD in parallel configuration using NH3/SiH4 gas mixtures. The mc-Si wafers were taken from the same column of Si cast ingot. After the deposition process, the layers were oxidized (thermal oxidation in dry oxygen ambient environment at 950 °C to get oxide/nitride (ON structure. Secondary ion mass spectroscopy (SIMS, Rutherford backscattering spectroscopy (RBS, Auger electron spectroscopy (AES and energy dispersive X-ray analysis (EDX were employed for analyzing quantitatively the chemical composition and stoichiometry in the oxide-nitride stacked films. The effect of annealing temperature on the chemical composition of ON structure has been investigated. Some species, O, N, Si were redistributed in this structure during the thermal oxidation of SiNx. Indeed, oxygen diffused to the nitride layer into Si2O2N during dry oxidation.

  6. Effect of Silicon Nanowire on Crystalline Silicon Solar Cell Characteristics

    Directory of Open Access Journals (Sweden)

    Zahra Ostadmahmoodi Do

    2016-06-01

    Full Text Available Nanowires (NWs are recently used in several sensor or actuator devices to improve their ordered characteristics. Silicon nanowire (Si NW is one of the most attractive one-dimensional nanostructures semiconductors because of its unique electrical and optical properties. In this paper, silicon nanowire (Si NW, is synthesized and characterized for application in photovoltaic device. Si NWs are prepared using wet chemical etching method which is commonly used as a simple and low cost method for producing nanowires of the same substrate material. The process conditions are adjusted to find the best quality of Si NWs. Morphology of Si NWs is studied using a field emission scanning electron microscopic technique. An energy dispersive X-Ray analyzer is also used to provide elemental identification and quantitative compositional information. Subsequently, Schottky type solar cell samples are fabricated on Si and Si NWs using ITO and Ag contacts. The junction properties are calculated using I-V curves in dark condition and the solar cell I-V characteristics are obtained under incident of the standardized light of AM1.5. The results for the two mentioned Schottky solar cell samples are compared and discussed. An improvement in short circuit current and efficiency of Schottky solar cell is found when Si nanowires are employed.

  7. Enhanced Sintering of Boron Carbide-Silicon Composites by Silicon

    Science.gov (United States)

    Zeng, Xiaojun; Liu, Weiliang

    2016-09-01

    Boron carbide (B4C)-silicon (Si) composites have been prepared by aqueous tape casting, laminating, and spark plasma sintering (SPS). The influences of silicon (Si) content on the phases, microstructure, sintering properties, and mechanical properties of the obtained B4C-Si composites are studied. The results indicate that the addition of Si powder can act as a sintering aid and contribute to the sintering densification. The addition of Si powder can also act as a second phase and contribute to the toughening for composites. The relative density of B4C-Si composites samples with adding 10 wt.% Si powder prepared by SPS at 1600 °C and 50 MPa for 8 min is up to 98.3%. The bending strength, fracture toughness, and Vickers hardness of the sintered samples are 518.5 MPa, 5.87 MPa m1/2, and 38.9 GPa, respectively. The testing temperature-dependent high-temperature bending strength and fracture toughness can reach a maximum value at 1350 °C. The B4C-Si composites prepared at 1600, 1650, and 1700 °C have good high-temperature mechanical properties. This paper provides a facile low-temperature sintering route for B4C ceramics with improved properties.

  8. Silicon Carbide Diodes Performance Characterization and Comparison With Silicon Devices

    Science.gov (United States)

    Lebron-Velilla, Ramon C.; Schwarze, Gene E.; Trapp, Scott

    2003-01-01

    Commercially available silicon carbide (SiC) Schottky diodes from different manufacturers were electrically tested and characterized at room temperature. Performed electrical tests include steady state forward and reverse I-V curves, as well as switching transient tests performed with the diodes operating in a hard switch dc-to-dc buck converter. The same tests were performed in current state of the art silicon (Si) and gallium arsenide (GaAs) Schottky and pn junction devices for evaluation and comparison purposes. The SiC devices tested have a voltage rating of 200, 300, and 600 V. The comparison parameters are forward voltage drop at rated current, reverse current at rated voltage and peak reverse recovery currents in the dc to dc converter. Test results show that steady state characteristics of the tested SiC devices are not superior to the best available Si Schottky and ultra fast pn junction devices. Transient tests reveal that the tested SiC Schottky devices exhibit superior transient behavior. This is more evident at the 300 and 600 V rating where SiC Schottky devices showed drastically lower reverse recovery currents than Si ultra fast pn diodes of similar rating.

  9. Enhanced Sintering of Boron Carbide-Silicon Composites by Silicon

    Science.gov (United States)

    Zeng, Xiaojun; Liu, Weiliang

    2016-11-01

    Boron carbide (B4C)-silicon (Si) composites have been prepared by aqueous tape casting, laminating, and spark plasma sintering (SPS). The influences of silicon (Si) content on the phases, microstructure, sintering properties, and mechanical properties of the obtained B4C-Si composites are studied. The results indicate that the addition of Si powder can act as a sintering aid and contribute to the sintering densification. The addition of Si powder can also act as a second phase and contribute to the toughening for composites. The relative density of B4C-Si composites samples with adding 10 wt.% Si powder prepared by SPS at 1600 °C and 50 MPa for 8 min is up to 98.3%. The bending strength, fracture toughness, and Vickers hardness of the sintered samples are 518.5 MPa, 5.87 MPa m1/2, and 38.9 GPa, respectively. The testing temperature-dependent high-temperature bending strength and fracture toughness can reach a maximum value at 1350 °C. The B4C-Si composites prepared at 1600, 1650, and 1700 °C have good high-temperature mechanical properties. This paper provides a facile low-temperature sintering route for B4C ceramics with improved properties.

  10. The Staphylococcus aureus Membrane Protein SA2056 Interacts with Peptidoglycan Synthesis Enzymes

    Directory of Open Access Journals (Sweden)

    Brigitte Berger-Bächi

    2013-01-01

    Full Text Available The yet uncharacterized membrane protein SA2056 belongs to the ubiquitous RND (Resistance-Nodulation-cell Division family of transmembrane efflux transporters. The sa2056 gene is located downstream of femX, the gene encoding the essential, non-ribosomal peptidyl-transferase adding the first glycine in the staphylococcal cell wall pentaglycine interpeptide. Due to its proximity to and weak co-transcription with femX, we assumed that sa2056 may somehow be involved in peptidoglycan synthesis. Specific antibodies against SA2056 showed that this protein is expressed during growth and present in the membrane fraction of cell preparations. Using a bacterial two hybrid system, SA2056 was shown to interact (i with itself, (ii with FemB, which adds glycines 4 and 5 to the peptidoglycan interpeptide and (iii with the essential penicillin binding proteins, PBP1 and PBP2, required for cell division and incorporation of the peptidoglycan into the cell wall. Unexpectedly, deletion of sa2056 led to no phenotype regarding growth, antibiotic resistances or cell morphology; nor did sa2056 deletion in combination with femB inactivation alter b-lactam and lysostaphin sensitivity and resistance, respectively, pointing to possible redundancy in the cell wall synthesis pathway. These results suggest an accessory role of SA2056 in S. aureus peptidoglycan synthesis, broadening the range of biological functions of RND proteins.

  11. 78 FR 5712 - Airworthiness Directives; CFM International, S.A. Turbofan Engines Modified by Supplemental Type...

    Science.gov (United States)

    2013-01-28

    ..., S.A. Turbofan Engines Modified by Supplemental Type Certificate SE00034EN AGENCY: Federal Aviation... directive (AD) for CFM International, S.A. CFM56-3, CFM56-3B, and CFM56-3C turbofan engines. This AD... of multiple turbine blades, damage to the engine, and damage to the airplane. DATES: This AD...

  12. Intersetorialidade na política de saúde do idoso

    Directory of Open Access Journals (Sweden)

    Grossi, Patricia Krieger

    2006-01-01

    Full Text Available Este artigo versa sobre a intersetorialidade na política de saúde do idoso. Apresenta uma discussão referente à conceituação e à construção da intersetorialidade. Aborda a saúde do idoso nos aspectos conceituais, legais e no enfrentamento de problemas concretos

  13. Draft Genome Sequence of Ochrobactrum intermedium Strain SA148, a Plant Growth-Promoting Desert Rhizobacterium

    KAUST Repository

    Lafi, Feras Fawzi

    2017-03-03

    Ochrobactrum intermedium strain SA148 is a plant growth-promoting bacterium isolated from sandy soil in the Jizan area of Saudi Arabia. Here, we report the 4.9-Mb draft genome sequence of this strain, highlighting different pathways characteristic of plant growth promotion activity and environmental adaptation of SA148.

  14. Educação Popular e Saúde e democracia no Brasil

    Directory of Open Access Journals (Sweden)

    Eduardo Navarro Stotz

    2014-12-01

    Full Text Available O ensaio se propõe a entender os limites, as possibilidades e os desafios do controle social do Sistema Único de Saúde à luz de uma reflexão sobre a democracia no Brasil com base nas referências da Educação Popular e Saúde.

  15. Data of evolutionary structure change: 1C5SA-1QRZD [Confc[Archive

    Lifescience Database Archive (English)

    Full Text Available dbID> A 1C5SA AHCYK-----SGIQV ...>GGG ----- EEE> ATOM 550 CA ALA A 56 34.816 22.651...QRZD AHCLEKSPRPSSYKV >EGGG EEEe>...DChain>1C5SA SCKSA--YPGQI ure>HHHHH-- ...DChain> VCNRYEFLNGRV >HH > <

  16. Data of evolutionary structure change: 1O2SA-2FOHA [Confc[Archive

    Lifescience Database Archive (English)

    Full Text Available entryIDChain>1O2SA SLNSG-----YHFCG >EEE ----- EE...ID>2FOH A 2FOHA SLQYRSGSSWAHTCG ...>EEEEEE EEE EEucture> ATOM 123 CA SER A 32 53....yIDChain>1O2SA PVVCS----GKLQG >EEEE ---- EEEE...LHCLVNGQYAVHG >EEEEEE EEEEEEe>

  17. Best Practices Case Study: S&A Homes, East Liberty, PIttsburgh, PA

    Energy Technology Data Exchange (ETDEWEB)

    None

    2010-12-01

    S&A Homes worked with Building America's IBACOS and architects Pfaffmann & Associates and Moss Associates to design energy-efficient homes for urban in-fill lots. This is a new market for S&A Homes, which builds over 500 homes a year using suburban designs.

  18. 77 FR 25644 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. Airplanes

    Science.gov (United States)

    2012-05-01

    ... Federal Aviation Administration 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira...) that apply to all Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 and ERJ 190 airplanes... information identified in this proposed AD, contact Empresa Brasileira de Aeronautica S.A....

  19. 75 FR 47190 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135...

    Science.gov (United States)

    2010-08-05

    ...-212-AD; Amendment 39-16378; AD 2010-16-02] RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 Airplanes; and Empresa Brasileira de Aeronautica S.A..., 44701. Sec. 39.13 0 2. The FAA amends Sec. 39.13 by adding the following new AD: 2010-16-02...

  20. 75 FR 52263 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170...

    Science.gov (United States)

    2010-08-25

    ...; AD 2010-18-04] RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira de Aeronautica S.A... [Amended] 0 2. The FAA amends Sec. 39.13 by adding the following new AD: 2010-18-04 Empresa Brasileira de..., contact Empresa Brasileira de Aeronautica S.A. (EMBRAER), Technical Publications Section (PC 060),...

  1. 77 FR 36224 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes

    Science.gov (United States)

    2012-06-18

    ... Federal Aviation Administration 14 CFR Part 39 RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira... all Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135 airplanes, and Model EMB-145... information identified in this proposed AD, contact Empresa Brasileira de Aeronautica S.A....

  2. 76 FR 27237 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170...

    Science.gov (United States)

    2011-05-11

    ...-153-AD; Amendment 39-16684; AD 2011-10-03] RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira... the following new AD: 2011-10-03 Empresa Brasileira de Aeronautica S.A. (EMBRAER): Amendment 39-16684... Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170-100 LR, -100 STD, -100 SE, and -100...

  3. 78 FR 66258 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Airplanes

    Science.gov (United States)

    2013-11-05

    ...-194-AD; Amendment 39-17650; AD 2013-22-18] RIN 2120-AA64 Airworthiness Directives; Empresa Brasileira... directive (AD) for certain Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model EMB-135ER, - 135KE, -135KL... information identified in this AD, contact Empresa Brasileira de Aeronautica S.A. (EMBRAER),...

  4. 75 FR 260 - Airworthiness Directives; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170...

    Science.gov (United States)

    2010-01-05

    ...; Empresa Brasileira de Aeronautica S.A. (EMBRAER) Model ERJ 170 Airplanes; and Model ERJ 190-100 STD, -100... Friday, except Federal holidays. For service information identified in this proposed AD, contact Empresa... amends Sec. 39.13 by adding the following new AD: Empresa Brasileira de Aeronautica S.A....

  5. Hydrogen infrastructure within HySA national program in South Africa: road map and specific needs

    CSIR Research Space (South Africa)

    Bessarabov, D

    2012-01-01

    Full Text Available The Department of Science and Technology of South Africa developed the National Hydrogen and Fuel Cells Technologies (HFCT) Research, Development and Innovation Strategy. The National Strategy was branded Hydrogen South Africa (HySA). HySA has been...

  6. Subconjunctival and Orbital Silicone Oil Granuloma (Siliconoma Complicating Intravitreal Silicone Oil Tamponade

    Directory of Open Access Journals (Sweden)

    Jung Hye Lee

    2014-01-01

    Full Text Available A 30-year-old male, who underwent previous pars plana vitrectomy and silicone oil tamponade due to endogenous endophthalmitis originated from Klebsiella liver abscess, was referred for evisceration. At 2 months after vitrectomy with silicon oil tamponade, conjunctival chemosis and ocular pain were aggravated. Diffuse eyelid swelling and large subconjunctival mass with lipid droplets were noted. On MRI examination, subconjunctival mass and intra- and extraconal orbital mass around superior rectus muscle were observed. Excision of subconjunctival and orbital mass was performed. Histopathologic examination showed multiple silicone oil vacuoles surrounded by foreign body giant cells and fibrosis, which confirmed silicone oil granuloma. In a patient with suspicious melting sclera in diseases such as endophthalmitis, large silicone oil granuloma may be complicated in a rapid fashion after intravitreal silicone oil tamponade due to silicone oil leakage.

  7. Growth of silicon carbide crystals on a seed while pulling silicon crystals from a melt

    Science.gov (United States)

    Ciszek, T. F.; Schwuttke, G. H. (Inventor)

    1979-01-01

    A saturated solution of silicon and an element such as carbon having a segregation coefficient less than unity is formed by placing a solid piece of carbon in a body of molten silicon having a temperature differential decreasing toward the surface. A silicon carbide seed crystal is disposed on a holder beneath the surface of the molten silicon. As a rod or ribbon of silicon is slowly pulled from the melt, a supersaturated solution of carbon in silicon is formed in the vicinity of the seed crystal. Excess carbon is emitted from the solution in the form of silicon carbide which crystallizes on the seed crystal held in the cool region of the melt.

  8. Fracture dynamics in implanted silicon

    Energy Technology Data Exchange (ETDEWEB)

    Massy, D.; Tardif, S.; Penot, J. D.; Ragani, J.; Rieutord, F. [Univ. Grenoble Alpes, F-38000 Grenoble (France); CEA, INAC-SP2M, F-38000 Grenoble (France); Mazen, F.; Madeira, F. [Univ. Grenoble Alpes, F-38000 Grenoble (France); CEA, LETI, MINATEC Campus, F-38054 Grenoble (France); Landru, D.; Kononchuk, O. [SOITEC, Parc Technologique des Fontaines, 38190 Bernin (France)

    2015-08-31

    Crack propagation in implanted silicon for thin layer transfer is experimentally studied. The crack propagation velocity as a function of split temperature is measured using a designed optical setup. Interferometric measurement of the gap opening is performed dynamically and shows an oscillatory crack “wake” with a typical wavelength in the centimetre range. The dynamics of this motion is modelled using beam elasticity and thermodynamics. The modelling demonstrates the key role of external atmospheric pressure during crack propagation. A quantification of the amount of gas trapped inside pre-existing microcracks and released during the fracture is made possible, with results consistent with previous studies.

  9. Silicon nanowires as intracellular devices

    Science.gov (United States)

    Zimmerman, John F.

    Semiconductor nanowire devices are an exciting class of materials for biomedical and electrophysiology applications, with current studies primarily delivering substrate bound devices through mechanical abrasion or electroporation. However, the ability to distribute these devices in a drug-like fashion is an important step in developing next-generation active therapeutic devices. In this work, we will discuss the interaction of label free Silicon nanowires (SiNWs) with cellular systems, showing that they can be internalized in multiple cell lines, and undergo an active 'burst-like' transport process. (Abstract shortened by ProQuest.).

  10. Enamel, Silicone Alkyd Copolymer (Metric)

    Science.gov (United States)

    2007-11-02

    shall consist of a copolymerized, air- drying, silicone modified long oil soya alkyd conforming to the requirements of table IV (see table VI...anhydride, percent by weight of nonvolatile vehicle Drying oil acids, percent by weight of nonvolatile vehicle Soya oil Rosin Phenolic resin...FED-STD-141 method Test Drying time 1/ Table V 4.6.17 Accelerated weathering 3.5.13 4061.2 D 523, D 569, D 2244, E 97, G 53 4.6.18 Soya

  11. The CDF Silicon Vertex Detector

    Energy Technology Data Exchange (ETDEWEB)

    Tkaczyk, S.; Carter, H.; Flaugher, B. [and others

    1993-09-01

    A silicon strip vertex detector was designed, constructed and commissioned at the CDF experiment at the Tevatron collider at Fermilab. The mechanical design of the detector, its cooling and monitoring are presented. The front end electronics employing a custom VLSI chip, the readout electronics and various components of the SVX system are described. The system performance and the experience with the operation of the detector in the radiation environment are discussed. The device has been taking colliding beams data since May of 1992, performing at its best design specifications and enhancing the physics program of CDF.

  12. Microfabricated silicon biosensors for microphysiometry

    Science.gov (United States)

    Bousse, L. J.; Libby, J. M.; Parce, J. W.

    1993-01-01

    Microphysiometers are biosensor devices that measure the metabolic rate of living cells by detecting the rate of extracellular acidification caused by a small number of cells. The cells are entrapped in a microvolume chamber, whose bottom surface is a silicon sensor chip. In a further miniaturization step, we have recently fabricated multichannel flow-through chips that will allow greater throughput and multiplicity. Microphysiometer technology can be applied to the detection of microorganisms. We describe the sensitive detection of bacteria and yeast. Further applications of microphysiometry to the characterization of microorganisms can be anticipated.

  13. Silicon based ultrafast optical waveform sampling

    DEFF Research Database (Denmark)

    Ji, Hua; Galili, Michael; Pu, Minhao

    2010-01-01

    A 300 nmx450 nmx5 mm silicon nanowire is designed and fabricated for a four wave mixing based non-linear optical gate. Based on this silicon nanowire, an ultra-fast optical sampling system is successfully demonstrated using a free-running fiber laser with a carbon nanotube-based mode-locker...

  14. Silicon solar cells: Physical metallurgy principles

    Science.gov (United States)

    Mauk, Michael G.

    2003-05-01

    This article reviews the physical metallurgy aspects of silicon solar cells. The production of silicon solar cells relies on principles of thermochemical extractive metallurgy, phase equilibria, solidification, and kinetics. The issues related to these processes and their impact on solar cell performance and cost are discussed.

  15. Silicon spintronics with ferromagnetic tunnel devices

    NARCIS (Netherlands)

    Jansen, R.; Dash, S. P.; Sharma, S.; Min, B. C.

    In silicon spintronics, the unique qualities of ferromagnetic materials are combined with those of silicon, aiming at creating an alternative, energy-efficient information technology in which digital data are represented by the orientation of the electron spin. Here we review the cornerstones of

  16. Silicon photonics for multicore fiber communication

    DEFF Research Database (Denmark)

    Ding, Yunhong; Kamchevska, Valerija; Dalgaard, Kjeld

    2016-01-01

    We review our recent work on silicon photonics for multicore fiber communication, including multicore fiber fan-in/fan-out, multicore fiber switches towards reconfigurable optical add/drop multiplexers. We also present multicore fiber based quantum communication using silicon devices....

  17. Silicon Timing Response to Particles and Light

    Energy Technology Data Exchange (ETDEWEB)

    Ronzhin, Anatoly [Fermilab; Spiropulu, Maria [Caltech

    2015-01-01

    It is observed growing interest to fast timing detectors in high energy physics, related, for example, with collider luminosity increase (LHC) [1]. The options of CMS [2] calorimeter upgrade based on silicon detectors renewed interest to the timing study of this type of detectors. The article is devoted to study of silicon timing response to particles and light.

  18. Performance of Ultra-Fast Silicon Detectors

    CERN Document Server

    Cartiglia, N; Ely, S; Fadeyev, V; Galloway, Z; Marchetto, F; Mazza, G; Ngo, J; Obertino, M; Parker, C; Rivetti, A; Shumacher, D; Sadrozinski, H F-W; Seiden, A; Zatserklyaniy, A

    2013-01-01

    The development of Low-Gain Avalanche Detectors has opened up the possibility of manufacturing silicon detectors with signal larger than that of traditional sensors. In this paper we explore the timing performance of Low-Gain Avalanche Detectors, and in particular we demonstrate the possibility of obtaining ultra-fast silicon detector with time resolution of less than 20 picosecond.

  19. Bubble Formation in Silicon-Quartz Interface

    OpenAIRE

    Kakimoto, K.; EGUCHI, M.; Ozoe, H.

    1997-01-01

    Bubble formation at an interface between silicon melt and a quartz crucible was studied by thermodynamical calculation and visualization of bubble formation using X-ray radiography. A phase diagram of silicon-oxygen (Si-O) system is also calculated from the reported thermodynamical data. Critical temperature and radius of bubble formation at the interface was discussed.

  20. R & D for the CMS silicon tracker

    CERN Document Server

    Feld, L; Angarano, M M; Azzi, P; Babucci, E; Bacchetta, N; Bader, A J; Bagliesi, G; Barr, A J; Bartalini, P; Basti, A; Biggeri, U; Bilei, G M; Bisello, D; Boemi, D; Bosi, F; Borrello, L; Bozzi, C; Braibant, S; Breuker, Horst; Bruzzi, Mara; Candelori, A; Caner, A; Castaldi, R; Castro, A; Catacchini, E; Checcucci, B; Ciampolini, P; Civinini, C; Creanza, D; D'Alessandro, R; Da Rold, M; Demaria, N; De Palma, M; Dell'Orso, R; Della Marina, R; Dutta, S; Eklund, C; Peisert, Anna; Fiore, L; Focardi, E; French, M; Freudenreich, Klaus; Fürtjes, A; Giassi, A; Giraldo, A; Glessing, W D; Gu, W H; Hall, G; Hammarström, R; Hebbeker, T; Honkanen, J A; Hrubec, Josef; Huhtinen, M; Kaminski, A; Karimäki, V; Kellogg, R G; König, S J; Krammer, Manfred; Lariccia, P; Lenzi, M; Loreti, M; Lübelsmeyer, K; Lustermann, W; Mättig, P; Maggi, G; Mannelli, M; Mantovani, G C; Marchioro, A; Mariotti, C; Martignon, G; McEvoy, B; Meschini, M; Messineo, A; My, S; Paccagnella, A; Palla, Fabrizio; Pandoulas, D; Parrini, G; Passeri, D; Pieri, M; Piperov, S; Potenza, R; Raffaelli, F; Raso, G; Raymond, M; Schmitt, B; Selvaggi, G; Servoli, L; Sguazzoni, G; Siedling, R; Silvestris, L; Skog, K; Starodumov, Andrei; Stavitski, I; Stefanini, G; Tempesta, P; Tonelli, G; Tricomi, A; Tuuva, T; Vannini, C; Verdini, P G; Viertel, Gert M; Xie, Z; Wang, Y; Watts, S; Wittmer, B

    1999-01-01

    The CMS silicon tracker, consisting of about 70 m/sup 2/ of silicon microstrip devices, has to be operated for at least 10 years in a harsh radiation environment. The main implications of this environment on the detector design are summarized and an overview of the expected performance is given. (2 refs).

  1. Silicon nanostructures produced by laser direct etching

    DEFF Research Database (Denmark)

    Müllenborn, Matthias; Dirac, Paul Andreas Holger; Petersen, Jon Wulff

    1995-01-01

    A laser direct-write process has been applied to structure silicon on a nanometer scale. In this process, a silicon substrate, placed in a chlorine ambience, is locally heated above its melting point by a continuous-wave laser and translated by high-resolution direct-current motor stages. Only...

  2. Micromachined silicon plates for sensing molecular interactions

    NARCIS (Netherlands)

    Carlen, E.T.; Weinberg, M.S.; Dube, C.E.; Zapata, A.M.; Borenstein, J.T.

    2006-01-01

    A micromachined surface stress sensor based on a thin suspended crystalline silicon circular plate measures differential surface stress changes associated with vapor phase chemisorption of an alkanethiol self-assembled monolayer. The isolated face of the suspended silicon plate serves as the sensing

  3. Silicon LEDs in FinFET technology

    NARCIS (Netherlands)

    Piccolo, G.; Kuindersma, P.I.; Ragnarsson, L-A.; Hueting, R.J.E.; Collaert, N.; Schmitz, J.

    2014-01-01

    We present what to our best knowledge is the first forward operating silicon light-emitting diode (LED) in fin-FET technology. The results show near-infrared (NIR) emission around 1100 nm caused by band-to-band light emission in the silicon which is uniformly distributed across the lowly doped activ

  4. Hydroxide catalysis bonding of silicon carbide

    NARCIS (Netherlands)

    Veggel, A.A. van; Ende, D.A. van den; Bogenstahl, J.; Rowan, S.; Cunningham, W.; Gubbels, G.H.M.; Nijmeijer, H.

    2008-01-01

    For bonding silicon carbide optics, which require extreme stability, hydroxide catalysis bonding is considered [Rowan, S., Hough, J. and Elliffe, E., Silicon carbide bonding. UK Patent 040 7953.9, 2004. Please contact Mr. D. Whiteford for further information: D.Whiteford@admin.gla.ac.uk]. This techn

  5. Note: Near infrared interferometric silicon wafer metrology.

    Science.gov (United States)

    Choi, M S; Park, H M; Joo, K N

    2016-04-01

    In this investigation, two near infrared (NIR) interferometric techniques for silicon wafer metrology are described and verified with experimental results. Based on the transparent characteristic of NIR light to a silicon wafer, the fiber based spectrally resolved interferometry can measure the optical thickness of the wafer and stitching low coherence scanning interferometry can reconstruct entire surfaces of the wafer.

  6. Piezoresistance in p-type silicon revisited

    DEFF Research Database (Denmark)

    Richter, Jacob; Pedersen, Jesper; Brandbyge, Mads;

    2008-01-01

    We calculate the shear piezocoefficient pi44 in p-type Si with a 6×6 k·p Hamiltonian model using the Boltzmann transport equation in the relaxation-time approximation. Furthermore, we fabricate and characterize p-type silicon piezoresistors embedded in a (001) silicon substrate. We find that the ...

  7. Oblique patterned etching of vertical silicon sidewalls

    Science.gov (United States)

    Bruce Burckel, D.; Finnegan, Patrick S.; David Henry, M.; Resnick, Paul J.; Jarecki, Robert L.

    2016-04-01

    A method for patterning on vertical silicon surfaces in high aspect ratio silicon topography is presented. A Faraday cage is used to direct energetic reactive ions obliquely through a patterned suspended membrane positioned over the topography. The technique is capable of forming high-fidelity pattern (100 nm) features, adding an additional fabrication capability to standard top-down fabrication approaches.

  8. Microstructuring of silicon with femtosecond laser pulses

    Energy Technology Data Exchange (ETDEWEB)

    Freund, Waldemar; Richters, Jan P.; Voss, Tobias; Gutowski, Juergen [Institute of Solid State Physics, Semiconductor Optics Group, University of Bremen (Germany)

    2011-07-01

    Silicon structured with ultrashort laser pulses which is called ''black silicon'' due to its dark appearance has been a field of intense studies in recent years. It exhibits a nearly uniform absorptivity beyond 90% in the whole visible to near-infrared spectral region. Therefore, it is a promising material for applications in solar cells and photo diodes. In this talk a brief introduction of microstructuring of silicon with ultrashort laser pulses will be given. Structuring is carried out in a sulfurhexafluoride (SF{sub 6}) atmosphere, which simultaneously allows doping of the silicon with sulfur far above the solubility limit. The structuring leads to a specific quasiperiodic surface morphology at which incident light is reflected multiple times. Thus light absorption in the silicon is considerably enhanced. The extremely high doping with sulfur results in the formation of a distinct defect band which is the origin of high absorptance in the near infrared. Furthermore, sulfur acts as a donor in silicon. Hence, microstructuring of p-doped silicon in SF{sub 6} atmosphere leads to the formation of a p-n{sup +} junction. This is an important step towards the fabrication of efficient solar cells and photo diodes with increased infrared sensitivity on base of easy-to-produce black silicon.

  9. Silicon on ceramic process. Silicon sheet growth development for the large-area silicon sheet task of the low-cost silicon solar array project

    Science.gov (United States)

    Zook, J. D.; Heaps, J. D.; Maciolek, R. B.; Koepke, B. G.; Butter, C. D.; Schuldt, S. B.

    1977-01-01

    The technical and economic feasibility of producing solar-cell-quality sheet silicon was investigated. The sheets were made by coating one surface of carbonized ceramic substrates with a thin layer of large-grain polycrystalline silicon from the melt. Significant progress was made in all areas of the program.

  10. Mechanism of single atom switch on silicon

    DEFF Research Database (Denmark)

    Quaade, Ulrich; Stokbro, Kurt; Thirstrup, C.

    1998-01-01

    We demonstrate single atom switch on silicon which operates by displacement of a hydrogen atom on the silicon (100) surface at room temperature. We find two principal effects by which the switch is controlled: a pronounced maximum of the switching probability as function of sample bias...

  11. Silicon spintronics with ferromagnetic tunnel devices

    NARCIS (Netherlands)

    Jansen, R.; Dash, S. P.; Sharma, S.; Min, B. C.

    2012-01-01

    In silicon spintronics, the unique qualities of ferromagnetic materials are combined with those of silicon, aiming at creating an alternative, energy-efficient information technology in which digital data are represented by the orientation of the electron spin. Here we review the cornerstones of sil

  12. Ultrafast laser functionalized rare phased gold-silicon/silicon oxide nanostructured hybrid biomaterials.

    Science.gov (United States)

    Premnath, P; Tan, B; Venkatakrishnan, K

    2015-12-01

    We introduce a hybrid nanostructured biomaterial that is a combination of rare phases of immiscible gold and silicon oxide, functionalized via ultrafast laser synthesis. For the first time, we show cancer controlling properties of rare phases of gold silicides, which include Au7Si, Au5Si, Au0.7Si2.3 and Au8Si2. Conventionally, pure forms of gold and silicon/silicon oxide are extensively employed in targeted therapy and drug delivery systems due to their unique properties. While silicon and silicon oxide nanoparticles have shown biocompatibility, gold nanoparticles show conflicting results based on their size and material properties. Several studies have shown that gold and silicon combinations produce cell controlling properties, however, these studies were not able to produce a homogenous combination of gold and silicon, owing to its immiscibility. A homogenous combination of gold and silicon may potentially enable properties that have not previously been reported. We describe rare phased gold-silicon oxide nanostructured hybrid biomaterials and its unique cancer controlling properties, owing to material properties, concentration, size and density. The gold-silicon oxide nanostructured hybrid is composed of individual gold-silicon oxide nanoparticles in various concentrations of gold and silicon, some nanoparticles possess a gold-core and silicon-shell like structure. The individual nanoparticles are bonded together forming a three dimensional nanostructured hybrid. The interaction of the nanostructured hybrids with cervical cancer cells showed a 96% reduction in 24h. This engineered nanostructured hybrid biomaterial presents significant potential due to the combination of immiscible gold and silicon oxide in varying phases and can potentially satiate the current vacuum in cancer therapy.

  13. Gettering of interstitial iron in silicon by plasma-enhanced chemical vapour deposited silicon nitride films

    Science.gov (United States)

    Liu, A. Y.; Sun, C.; Markevich, V. P.; Peaker, A. R.; Murphy, J. D.; Macdonald, D.

    2016-11-01

    It is known that the interstitial iron concentration in silicon is reduced after annealing silicon wafers coated with plasma-enhanced chemical vapour deposited (PECVD) silicon nitride films. The underlying mechanism for the significant iron reduction has remained unclear and is investigated in this work. Secondary ion mass spectrometry (SIMS) depth profiling of iron is performed on annealed iron-contaminated single-crystalline silicon wafers passivated with PECVD silicon nitride films. SIMS measurements reveal a high concentration of iron uniformly distributed in the annealed silicon nitride films. This accumulation of iron in the silicon nitride film matches the interstitial iron loss in the silicon bulk. This finding conclusively shows that the interstitial iron is gettered by the silicon nitride films during annealing over a wide temperature range from 250 °C to 900 °C, via a segregation gettering effect. Further experimental evidence is presented to support this finding. Deep-level transient spectroscopy analysis shows that no new electrically active defects are formed in the silicon bulk after annealing iron-containing silicon with silicon nitride films, confirming that the interstitial iron loss is not due to a change in the chemical structure of iron related defects in the silicon bulk. In addition, once the annealed silicon nitride films are removed, subsequent high temperature processes do not result in any reappearance of iron. Finally, the experimentally measured iron decay kinetics are shown to agree with a model of iron diffusion to the surface gettering sites, indicating a diffusion-limited iron gettering process for temperatures below 700 °C. The gettering process is found to become reaction-limited at higher temperatures.

  14. Aprendem doença, educam para a saúde : influência da formação, em futuros profissionais de saúde em concepções saúde/doença, educação para a saúde e sua implementação

    OpenAIRE

    Araújo, Isabel Maria Batista de

    2004-01-01

    Dissertação de mestrado em Educação, área de especialização em Educação para a Saúde Sucessivas reuniões internacionais apelam à implementação de actividades de educação para a saúde, apoiando-se na evolução do conceito de saúde, entendido como um recurso, um estado positivo de bem-estar individual e comunitário. Perspectivam a educação para a saúde como processo de capacitar os indivíduos e comunidades a aumentar o controlo sobre os factores que determinam a saúde através de diferentes me...

  15. An efficient hybrid evolutionary optimization algorithm based on PSO and SA for clustering

    Institute of Scientific and Technical Information of China (English)

    Taher NIKNAM; Babak AMIRI; Javad OLAMAEI; Ali AREFI

    2009-01-01

    The K-means algorithm is one of the most popular techniques in clustering. Nevertheless, the performance of the Kmeans algorithm depends highly on initial cluster centers and converges to local minima. This paper proposes a hybrid evolutionary programming based clustering algorithm, called PSO-SA, by combining particle swarm optimization (PSO) and simulated annealing (SA). The basic idea is to search around the global solution by SA and to increase the information exchange among particles using a mutation operator to escape local optima. Three datasets, Iris, Wisconsin Breast Cancer, and Riplcy's Glass, have been considered to show the effectiveness of the proposed clustering algorithm in providing optimal clusters. The simulation results show that the PSO-SA clustering algorithm not only has a better response but also converges more quickly than the K-means, PSO, and SA algorithms.

  16. A eterna busca da verdade em Die Lehrlinge zu Saïs, de Novalis

    Directory of Open Access Journals (Sweden)

    Natália Corrêa Porto Sanches Fadel

    2010-01-01

    Full Text Available The purpose of this essay is to undergo an investigation geared towards identifying the consolidation of the symbolized Upper or Ideal Truth illustrated by the figure of the goddess Saïs in the fragmentary novel Die Lehrlinge zu Saïs, from Novalis, written in 1801. As part of our approach, we traced a parallel between the allegorical use of Saïs myth by Novalis and in Schiller´s poem Das verschleierte Bild zu Saïs, aiming at a better characterization of Novalis' concept of the Ideal Truth. Lastly, we analyzed the fairy tale Hyazinth und Rosenblüte, which is part of the novel Die Lehrlinge zu Saïs, where it is possible to envisage the finding of the Ideal Truth searched by the poets of German Early Romanticism, especially by Novalis.

  17. Qualidade de vida relacionada à saúde de filhos de profissionais da área de saúde

    Directory of Open Access Journals (Sweden)

    Silvia Maria Moussi Gamallo

    2012-12-01

    Full Text Available Neste estudo mensuramos a qualidade de vida relacionada à saúde (QVRS e a fadiga de filhos de profissionais da área da saúde, com idades entre 2 e 11 anos, e avaliamos os hábitos diários e o sono dessas crianças e dos respectivos pais. Foram incluídas no estudo crianças de uma escola pública. Dados demográficos e dados de hábitos diários foram colhidos. A QVRS, o sono e a fadiga foram mensurados por questionários. Participaram 249 pais - 63,5% referiram sono adequado e 47,4% acordavam cansados. A média da idade das crianças foi 5,6 anos - 62,2% assistiam televisão no quarto, 50% usavam computador (> 4 horas/dia e 27,8% faziam atividades físicas extracurriculares. O escore do sono foi de 45,8 ± 12,2. Os escores de QVRS foram mais elevados no aspecto físico e mais baixos no emocional. Detectamos que o sono de pior qualidade dos filhos e dos pais pode estar relacionado à pior QVRS dos filhos. Concluímos que os hábitos inadequados dos pais, bem como das crianças, estão relacionados a uma diminuição da QVRS dos filhos, especialmente no aspecto emocional.

  18. Recent trends in silicon carbide device research

    Directory of Open Access Journals (Sweden)

    Munish Vashishath

    2008-08-01

    Full Text Available Silicon carbide (SiC has revolutionised semiconductor power device performance. It is a wide band gap semiconductor with an energy gap wider than 2eV and possesses extremely high power, high voltage switching characteristics and high thermal, chemical and mechanical stability. The SiC wafers are available in 6H, 4H, 2H and 3C polytypes. Because of its wide band gap, the leakage current of SiC is many orders of magnitude lower than that of silicon. Also, forward resistance of SiC power devices is approximately 200 times lower than that of conventional silicon devices. The breakdown voltage of SiC is 8-10 times higher than that of silicon. In this paper, silicon carbide Schottky barrier diodes, power MOSFETs, UMOSFET, lateral power MOSFET, SIT (static induction transistor, and nonvolatile memories are discussed along with their characteristics and applications.

  19. Fabricating solar cells with silicon nanoparticles

    Science.gov (United States)

    Loscutoff, Paul; Molesa, Steve; Kim, Taeseok

    2014-09-02

    A laser contact process is employed to form contact holes to emitters of a solar cell. Doped silicon nanoparticles are formed over a substrate of the solar cell. The surface of individual or clusters of silicon nanoparticles is coated with a nanoparticle passivation film. Contact holes to emitters of the solar cell are formed by impinging a laser beam on the passivated silicon nanoparticles. For example, the laser contact process may be a laser ablation process. In that case, the emitters may be formed by diffusing dopants from the silicon nanoparticles prior to forming the contact holes to the emitters. As another example, the laser contact process may be a laser melting process whereby portions of the silicon nanoparticles are melted to form the emitters and contact holes to the emitters.

  20. Silicon quantum dots for biological applications.

    Science.gov (United States)

    Chinnathambi, Shanmugavel; Chen, Song; Ganesan, Singaravelu; Hanagata, Nobutaka

    2014-01-01

    Semiconductor nanoparticles (or quantum dots, QDs) exhibit unique optical and electronic properties such as size-controlled fluorescence, high quantum yields, and stability against photobleaching. These properties allow QDs to be used as optical labels for multiplexed imaging and in drug delivery detection systems. Luminescent silicon QDs and surface-modified silicon QDs have also been developed as potential minimally toxic fluorescent probes for bioapplications. Silicon, a well-known power electronic semiconductor material, is considered an extremely biocompatible material, in particular with respect to blood. This review article summarizes existing knowledge related to and recent research progress made in the methods for synthesizing silicon QDs, as well as their optical properties and surface-modification processes. In addition, drug delivery systems and in vitro and in vivo imaging applications that use silicon QDs are also discussed.