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Search Results: 1 - 10 of 1835 matches for " sic (100). "
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Ab initio determination of the (100) surfaces phonon dispersions of the SiC
Soares, J. S.;Alves, H. W. Leite;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000300018
Abstract: in this work, we presented our preliminary ab initio results for the vibrational modes and the phonon frequencies of the sic (100) surfaces. our results are in good agreement with the available experimental data whenever this comparison is possible. for the accepted models of the c-terminated surfaces in the c(2×2) reconstruction, while in the bridge-dimer model there is an acetylene-like vibrational a1 mode at 2031 cm-1, which is infrared active, in the staggered-dimer model, there is a füchs-kliewer (fk) mode at 1328 cm-1, which is experimentally detected. for si-terminated surfaces in the p(2×1) reconstruction, instead, no fk was obtained, in contradiction with the hreels experimental results for the si-terminated surfaces, but they are in consonance with the fact that this surface should be described by a (3×2) or more complex models.
Structural and electronic properties of the SiC (100) surfaces
Soares, J. S.;Alves, H. W. Leite;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000300017
Abstract: in this work, we present our preliminary ab initio results for the structural and electronic properties of both si- and c-terminated sic (100) surfaces in (2×1) and c(2×2) reconstruction patterns. based on our results, we found that the si-terminated surfaces are dominated by weak bonded si-dimers, which are stabilized only at si-rich conditions, leading to (3×2) or more complex reconstruction patterns, as verified experimentally. also, our results show that the c-terminated surfaces is characterized by strong triply-bonded c-dimers, in a c(2×2) reconstruction pattern, which consists of c2 pairs over si bridge sites, in agreement with experimental results.
Heteroepitaxial Growth and Heterojunction Characteristics of Voids-Free n-3C-SiC on p-Si(100)
无坑洞n-3C-SiC/p-Si(100)的LPCVD外延生长及其异质结构特性(英文)

SUN Guosheng,Sun Yanling,Wang Lei,Zhao Wanshun,Luo Muchang,Zhang Yongxing,Zeng Yiping,Li Jinmin,Lin Lanying,
孙国胜
,孙艳玲,王雷,赵万顺,罗木昌,张永兴,曾一平,李晋闽,林兰英

半导体学报 , 2003,
Abstract: 在MBE/CVD高真空系统上,利用低压化学气相淀积( L PCVD)方法在直径为5 0 mm的单晶Si( 10 0 )衬底上生长出了高取向无坑洞的晶态立方相碳化硅( 3 C- Si C)外延材料,利用反射高能电子衍射( RHEED)和扫描电镜( SEM)技术详细研究了Si衬底的碳化过程和碳化层的表面形貌,获得了制备无坑洞3 C- Si C/Si的优化碳化条件,采用霍尔( Hall)测试等技术研究了外延材料的电学特性,研究了n- 3 C- Si C/p- Si异质结的I- V、C- V特性及I- V特性对温度的依赖关系.室温下n- 3 C- Si C/p- Si异质结二极管的最大反向击穿电压达到2 2 0 V,该n- 3 C- Si C/p- Si异质结构可用于制
High Efficiency SiC Terahertz Source in Mixed Tunnelling Avalanche Transit Time Mode  [PDF]
Pranati Panda, Satya Narayana Padhi, Gana Nath Dash
World Journal of Nano Science and Engineering (WJNSE) , 2014, DOI: 10.4236/wjnse.2014.44018
Abstract: High frequency properties of 4H-SiC double drift region (DDR) Mixed Tunnelling Avalanche Transit Time (MITATT) diodes are studied through computer simulation method. It is interesting to observe that the efficiency of SiC (flat) DDR MITATT diode (16%) is more than 4 times that of Si (flat) DDR MITATT diode (3.59%). In addition, a power output of more than 15 times from the SiC MITATT diode compared to the Si MITATT diode is commendable. A reduced noise measure of 17.71 dB from a low-high-low (lo-hi-lo) structure compared to that of 21.5 dB from a flat structure of SiC is indicative of the favourable effect of tunnelling current on the MITATT diode performance.
Outcome following severe traumatic brain injury TBI correlates with serum S100B but not brain extracellular fluid S100B: An intracerebral microdialysis study  [PDF]
Craig D. Winter, Geraldine F. Clough, Ashley K. Pringle, Martin K. Church
World Journal of Neuroscience (WJNS) , 2013, DOI: 10.4236/wjns.2013.32013
Abstract:

S100B protein is released by astrocytes into the brain extracellular fluid following acute brain injury and elevated levels in CSF and serum have been shown to correlate with patient outcome following traumatic brain injury. A prospective study of brain extracellular fluid (ECF) and serum S100B levels in 12 patients with severe head injury (GCS ≤ 8) was undertaken using intracerebral microdialysis to investigate whether a correlation with ECF S100B and outcome could be confirmed. Patient outcomes were assessed at 6 months using the Glasgow Outcome Scale (GOS) and divided into two outcome groups: group A, 8 survivors with either a good recovery or moderate disability (GOS scores of 4 or 5); and group B, 4 patients who died (GOS 1). Peak serum levels of S100B were significantly greater in group B (mean 6.03 ng/ml) compared with group A (mean 0.73 ng/ml) (P = 0.009). Group A had a mean peak S100B in the extracellular compartment of 186 ng/ml compared to 150 ng/ml in group B. There was no significant difference between the mean peak brain ECF S100B concentrations for the 2 outcome groups (P = 0.932). We confirm that intracerebral microdialysis can be used to sample S100B concentrations from brain extracellular fluid and our results suggest that the ECF S100B levels were variable and that there was no significant difference between the good outcome and poor outcome groups. In contrast, the serum levels of S100B of patients with a poor outcome were significantly higher than those with a good outcome.

S100B and delirium in the geriatric acute care setting  [PDF]
Walaa W. Aly, Samia A. Abdul-Rahman, Salma M. S. El Said, Samah A. Bastawy
Advances in Aging Research (AAR) , 2014, DOI: 10.4236/aar.2014.31001
Abstract:

Delirium and its relation to biochemical markers have been considered a study question in several research works. The relation between S100B levels and delirium is still a matter of discussion. Objective: To compare the serum level of S100B in patients with and without delirium and to detect the relation between S100B and delirium subtypes. Method: A case control study was conducted on 114 elderly (60 years and older) selected from the geriatric acute care unit at Ain Shams University Hospitals. They were classified into two groups; 58 elderly cases who had delirium diagnosed by Confusion Assessment Method and 56 controls. Then delirium was reclassified according to the subtypes of delirium into Hyperactive: 46 patients, hypoactive: 2 patients, and Mixed: 10 patients. Serum S100B levels were determined by ELISA. Results: Cases were significantly older than controls (72.4 ± 9.4 versus 66.9 ± 5.3 years respectively) (P < 0.001). S100B levels were higher in cases (32.4 ± 9.8 pg/ml) than controls (30 ± 9.3 pg/ml) but the difference was not statistically significant (P = 0.19). There was no significant difference in S100B levels between the different subtypes of delirium. Conclusion: Delirious patients had higher S100B levels than controls but the difference was not statistically significant.

Achieving 100% Throughput for Integrated Uni- and Multicast Traffic without Speedup  [PDF]
Fulong Yan, Qingxu Xiong, Han Xiao, Jiacheng Liang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.105B004
Abstract:
Along with the unbounded speedup and exponential growth of virtual queues requirement aiming for 100% throughput of multicast scheduling as the size of the high-speed switches scale, the issues of low throughput of multicast under non-speedup or fixed crosspoint buffer size is addressed. Inspired by the load balance two-stage Birkhoff-von Neumann architecture that can provide 100% throughput for all kinds of unicast traffic, a novel 3-stage architecture, consisting of the first stage for multicast fan-out splitting, the second stage for load balancing, and the last stage for switching (FSLBS) is proposed. And the dedicated multicast fan-out splitting to unicast (M2U) scheduling algorithm is developed for the first stage, while the scheduling algorithms in the last two stages adopt the periodic permutation matrix. FSLBS can achieve 100% throughput for integrated uni- and multicast traffic without speedup employing the dedicated M2U and periodic permutation matrix scheduling algorithm. The operation is theoretically validated adopting the fluid model.
Wst pne porównanie wyników badań zanieczyszczenia powietrza grzybami z wykorzystaniem aparatu SAS SUPER 100 i MAS 100. Doniesienie wst pne
El?bieta Krajewska-Ku?ak,Agnieszka Gniadek,Cecylia R. ?ukaszuk,Anna B. Macura
Medical Mycology , 2009,
Abstract: Wprowadzenie: Monitorowanie czysto ci mikrobiologicznej rodowiska w pomieszczeniach, zw aszcza placówek ochrony zdrowia, jest szczególnie wa ne. W zwi zku z powy szym celowe jest prowadzenie badań ulepszaj cych i modyfikuj cych metody oceny powietrza. Cel pracy: Celem pracy by o wst pne porównanie wyników badań zanieczyszczenia powietrza grzybami z wykorzystaniem aparatów SAS SUPER 100 i MAS 100. Materia i metody: Materia do badań mikologicznych stanowi o powietrze pobierane z pomieszczeń rehabilitacyjnych, korytarzy oraz przed wej ciem do budynku szpitala. Do monitorowania zanieczyszczenia powietrza grzybami u yto aparatów: SAS SUPER 100 (pbi-international) oraz MAS 100 (Merck). Wyniki: W przypadku aparatu MAS 100 warto ci CFU/l waha y si od 1340 do 50 i wynosi y rednio dla wszystkich pomiarów 302,5±56,6. W przypadku aparatu SAS SUPER 100 warto ci CFU/l waha y si od 200 do 0 i wynosi y rednio dla wszystkich pomiarów 104,8±84,9. W próbkach powietrza pobranych aparatem MAS 100 izolowano 11 rodzajów/gatunków grzybów, a aparatem SAS Super 100 - 7 rodzajów/gatunków. Te same rodzaje grzybów izolowano jedynie w przypadku próbek powietrza z pracowni fizykoterapii oraz pracowni kinezyterapii I, korytarza przy pracowni kinezyterapii. Aparatem MAS 100 izolowano 4 rodzaje/gatunki grzybów, których nie uzyskano w hodowli z adnej próbki pobranej aparatem SAS SUPER 100 Wnioski: W wi kszo ci badanych pomieszczeń wykazano istotne statystycznie ró nice w warto ciach CFU/l w zale no ci od rodzaju u ytego aparatu. Analiza mikologiczna hodowli grzybów uzyskanych z pobranych próbek powietrza pozwoli a na stwierdzenie, i nie zawsze z materia u pobranego u ytymi aparatami izolowano te same rodzaje/gatunki grzybów. Celowe jest prowadzenie dalszych poszerzonych badań oceny zanieczyszczenia powietrza grzybami z u yciem ró nych przyrz dów pomiarowych.
Caracteriza??o de minérios: uso do Magstream-Model 100, suas vantagens e limita??es
Salum, Maria José Gazzi;Peres, Ant?nio Eduardo Clark;
Rem: Revista Escola de Minas , 2002, DOI: 10.1590/S0370-44672002000100011
Abstract: this paper discusses the importance of mineral characterization as a support to understand their behavior in mineral processing and in the control of the processes and quality of the products obtained. also presented is a brief review on the main techniques used in minerals characterization, including the procedures for minerals separation from an ore. special attention was given to the technique of mineral separation from an ore according to their specific gravities using a device called magstream-model 100. it is shown that the magstream process, which involves the use of a magnetic fluid as a medium for mineral separation, a magnetic field and a rotation speed system, offers advantages compared to the heavy liquids technique. however, the magstream process leads to changes on mineral surface properties, imparting to them different flotation behaviors. this fact is considered a limitation for its use when further studies with the minerals involve surface properties.
Thermal Conductivity and Microstructure Properties of Porous SiC Ceramic Derived from Silicon Carbide Powder  [PDF]
Xiuwen Wu, Hongwen Ma, Xiaochao Chen, Zhanbing Li, Jie Li
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.31007
Abstract: Porous SiC ceramic were prepared with silicon carbide powder as the aggregate, silicone resin as the binder and pore agent by the process of mixing, iso-static pressure molding, and calcination. The mechanical properties and microstructures of the samples were characterized with a universal testing machine, X-ray diffraction, scanning electron microscope, and mercury injection. Two main factors, molding pressures and silicone resin mass ratio were studied in the experiments. The thermal conductivity of the samples was tested. The compressive strength was up to 19.4 MPa, and the porosities up to 30%. The thermal conductivities, mainly influenced by porosities, increased from 0.68 W.m-1.K-1 to 1.03 W.m-1.K-1 with the porosity decreasing from 41.96% to 31.30%.
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