SiC Semiconductor Applications - An Air Force Perspective

1996 ◽  
Vol 423 ◽  
Author(s):  
L. S. Rea
Keyword(s):  
Air Force ◽  
Device Performance ◽  
Full Potential ◽  
Materials Development ◽  
Device Development ◽  
Performance Requirements ◽  
Wide Range ◽  
The Status ◽  
Performance Results ◽  
High Temperature Electronic

AbstractThe Department of Defense (DoD) is investing in the development of Silicon Carbide (SiC) for a wide range of applications. Over the past year, SiC technology has demonstrated excellent device performance results for power devices, high temperature electronic devices and microwave devices. The materials growth and processing technology for SiC is now at a level of sufficient maturity to support substantial device development efforts. While there is still considerable materials and device research required for SiC to achieve it's full potential, the fundamental technology has been proven for several critical applications. A perspective on some Air Force device performance requirements will be presented. The status of SiC materials development, material limits to advances in device performance and issues relating to supporting technology will also be discussed.

Recent Applications of High Resolution Electron Microscopy to Crystalline Arrays of Virus Particles

1978 ◽  
Vol 36 (3) ◽  
pp. 470-482 ◽  
Author(s):  
R.W. Horne
Keyword(s):  
Electron Microscopy ◽  
Image Processing ◽  
Analytical Techniques ◽  
Staining Technique ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Full Potential ◽  
Virus Particles ◽  
Resolution Electron ◽  
Wide Range

The technique of surrounding virus particles with a neutralised electron dense stain was described at the Fourth International Congress on Electron Microscopy, Berlin 1958 (see Home & Brenner, 1960, p. 625). For many years the negative staining technique in one form or another, has been applied to a wide range of biological materials. However, the full potential of the method has only recently been explored following the development and applications of optical diffraction and computer image analytical techniques to electron micrographs (cf. De Hosier & Klug, 1968; Markham 1968; Crowther et al., 1970; Home & Markham, 1973; Klug & Berger, 1974; Crowther & Klug, 1975). These image processing procedures have allowed a more precise and quantitative approach to be made concerning the interpretation, measurement and reconstruction of repeating features in certain biological systems.

РУССКИЙ ЯЗЫК – ЯЗЫК ВЫСШЕГО ОБРАЗОВАНИЯ В КГМА

2020 ◽  
pp. 50-53
Author(s):  
Г. Кульбаева
Keyword(s):  
Russian Language ◽  
Educational Activity ◽  
Official Language ◽  
Main Motivation ◽  
Language Functioning ◽  
Teaching Language ◽  
Medical Academy ◽  
Wide Range ◽  
The Status ◽  
The Russian Language

Аннотация. В статье рассматривается вопрос о функционировании русского языка в образовательном пространстве КГМА. Большое место в работе занимает роль русского языка в учебной деятельности студентов-медиков. Мотивацией к изучению именно, русского языка являются следующие факторы: статус официального языка; возможность привлечь внимание широкого круга специалистов к своим исследованиям; понимание престижности русского языка. В статье нашли отражение различные формы работы по расширению сферы использования русского языка в медицинской академии. В работе уделено внимание и профильным учебным пособиям, разработанным автором статьи. Анализ некоторых заданий позволяет констатировать тот факт, что содержание пособии определено через компетенции, одной из которых является языковая. Ключевые слова:язык обучения, фундаментальные науки, соматические ФЕ, компетентностная основа, профессиональная направленность, жаргонная лексика. Аннотация. Макалада КММАнын билим берүү мейкиндеги орус тилин өздөштүү маселеси каралат. Орус тили студент-медиктердин окуу ишмердигинде чоң роль ойнойт. Расмий тил статусу, өз изилдөөлөрүнө көпчүлүк адистердин көңүлүн буруу мүмкүнчүлүгү, орус тилинин баркын түшүнүү, өзгөчөлөп билүүгө далил болуп эсептелет. Макалада медициналык академияда орус тили колдонуу чөйрөсүн кеңейтүү боюнча иштөөнү ар кандай формалары көрсөтүлгөн. Эмгекте макаланын автору иштеп чыккан адистик окуу колдонмолорго да көңул бурулган. Кээ бир тапшырмалардын анализи колдонмонун мазмуну компетенция, анын бирөөсү тил аркылуу аныкталганын факт катары көрсөтүүгө мүмкүндүк түзөт. Түйүндүү сөздөр: фундаменталдык илимдер, соматикалык фразеологизмдер, компетенттик негиз, профессионалдык багытталыш, жаргондук лексика. Summary. The article discusses the Russian language functioning in the of the KSMA’s educational space. Russian language plays a big role in the educational activity of the medical students. The main motivation of learning the Russian language has the following points: the status of the official language; the opportunity to attract the attention of a wide range of specialists to their research; understanding of the prestige of the Russian language. The article reflected various forms of work to expand the scope of the use of the Russian language at the medical academy. The work focuses on specialized textbooks developed by the author of the article. An analysis of some tasks allows us to state the fact that the content of the manual is determined through competencies, one of which is the language. Key words: teaching language, fundamental sciences, somatic phraseological unit, slang vocabulary.

Recycling and Reuse in the Roman Economy

2020 ◽  
Keyword(s):  
Building Materials ◽  
Computational Modelling ◽  
Late Antique ◽  
Roman Economy ◽  
Wide Range ◽  
The Status ◽  
Recent Developments ◽  
Methodological Approaches ◽  
First Time ◽  
Site Types

The recycling and reuse of materials and objects were extensive in the past, but have rarely been embedded into models of the economy; even more rarely has any attempt been made to assess the scale of these practices. Recent developments, including the use of large datasets, computational modelling, and high-resolution analytical chemistry, are increasingly offering the means to reconstruct recycling and reuse, and even to approach the thorny matter of quantification. Growing scholarly interest in the topic has also led to an increasing recognition of these practices from those employing more traditional methodological approaches, which are sometimes coupled with innovative archaeological theory. Thanks to these efforts, it has been possible for the first time in this volume to draw together archaeological case studies on the recycling and reuse of a wide range of materials, from papyri and textiles, to amphorae, metals and glass, building materials and statuary. Recycling and reuse occur at a range of site types, and often in contexts which cross-cut material categories, or move from one object category to another. The volume focuses principally on the Roman Imperial and late antique world, over a broad geographical span ranging from Britain to North Africa and the East Mediterranean. Last, but not least, the volume is unique in focusing upon these activities as a part of the status quo, and not just as a response to crisis.

scholarly journals Atmospheric Pressure Plasma Deposition of TiO2: A Review

Materials ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 2931
Author(s):  
Soumya Banerjee ◽  
Ek Adhikari ◽  
Pitambar Sapkota ◽  
Amal Sebastian ◽  
Sylwia Ptasinska
Keyword(s):  
Atmospheric Pressure ◽  
Gas Flow ◽  
Plasma Deposition ◽  
Atmospheric Pressure Plasma ◽  
Cost Savings ◽  
Historical Background ◽  
Pressure Plasma ◽  
Wide Range ◽  
The Status ◽  
Deposition Techniques

Atmospheric pressure plasma (APP) deposition techniques are useful today because of their simplicity and their time and cost savings, particularly for growth of oxide films. Among the oxide materials, titanium dioxide (TiO2) has a wide range of applications in electronics, solar cells, and photocatalysis, which has made it an extremely popular research topic for decades. Here, we provide an overview of non-thermal APP deposition techniques for TiO2 thin film, some historical background, and some very recent findings and developments. First, we define non-thermal plasma, and then we describe the advantages of APP deposition. In addition, we explain the importance of TiO2 and then describe briefly the three deposition techniques used to date. We also compare the structural, electronic, and optical properties of TiO2 films deposited by different APP methods. Lastly, we examine the status of current research related to the effects of such deposition parameters as plasma power, feed gas, bias voltage, gas flow rate, and substrate temperature on the deposition rate, crystal phase, and other film properties. The examples given cover the most common APP deposition techniques for TiO2 growth to understand their advantages for specific applications. In addition, we discuss the important challenges that APP deposition is facing in this rapidly growing field.

scholarly journals Enhanced Bilosomal Properties Resulted in Optimum Pharmacological Effects by Increased Acidification Pathways

Pharmaceutics ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1184
Author(s):  
Armin Mooranian ◽  
Thomas Foster ◽  
Corina M Ionescu ◽  
Daniel Walker ◽  
Melissa Jones ◽  
...  
Keyword(s):  
Bile Acids ◽  
Biological Effects ◽  
Cellular Respiration ◽  
Full Potential ◽  
Protective Effects ◽  
Pharmacological Effects ◽  
Β Cells ◽  
Positive Effects ◽  
Wide Range ◽  
Anti Inflammatory

Introduction: Recent studies in our laboratory have shown that some bile acids, such as chenodeoxycholic acid (CDCA), can exert cellular protective effects when encapsulated with viable β-cells via anti-inflammatory and anti-oxidative stress mechanisms. However, to explore their full potential, formulating such bile acids (that are intrinsically lipophilic) can be challenging, particularly if larger doses are required for optimal pharmacological effects. One promising approach is the development of nano gels. Accordingly, this study aimed to examine biological effects of various concentrations of CDCA using various solubilising nano gel systems on encapsulated β-cells. Methods: Using our established cellular encapsulation system, the Ionic Gelation Vibrational Jet Flow technology, a wide range of CDCA β-cell capsules were produced and examined for morphological, biological, and inflammatory profiles. Results and Conclusion: Capsules’ morphology and topographic characteristics remained similar, regardless of CDCA or nano gel concentrations. The best pharmacological, anti-inflammatory, and cellular respiration, metabolism, and energy production effects were observed at high CDCA and nano gel concentrations, suggesting dose-dependent cellular protective and positive effects of CDCA when incorporated with high loading nano gel.

scholarly journals Key Challenges in the Status Analysis for the Sustainable Urban Mobility Plan in Podgorica, Montenegro

2021 ◽  
Vol 13 (3) ◽  
pp. 1037
Author(s):  
Radoje Vujadinović ◽  
Jelena Šaković Jovanović ◽  
Aljaž Plevnik ◽  
Luka Mladenovič ◽  
Tom Rye
Keyword(s):  
Traffic Accidents ◽  
Road Traffic ◽  
Motor Vehicles ◽  
Urban Mobility ◽  
Passenger Cars ◽  
Study Program ◽  
Wide Range ◽  
The Status ◽  
Sustainable Urban Mobility ◽  
Status Analysis

The paper presents the results of the application of a practical approach for collecting data, which provides a simple, cost efficient, and easily reproducible method that was applied to obtain the necessary data for the status analysis of the Sustainable Urban Mobility Plan (SUMP) for Podgorica, the capital of Montenegro. Important data for the estimation of the existing condition of the traffic system were collected through desk research from the appropriate institutions and organizations. Several surveys and focus group interviews were conducted, in which about 5000 residents of Podgorica participated. In addition to answering questions, residents made numerous suggestions, confirming the correctness of a participatory approach in the new traffic planning paradigm that provides the SUMP with crucial advantages. A manual cordon count of traffic on five bridges for the traffic of the motor vehicles, as well as on two pedestrian-only bridges, was performed by students from the study program Road Traffic, and there are plans to repeat this in the coming years in order to enable more reliable monitoring and evaluation of the obtained data. Contemporary quality management tools such as BYPAD and ParkPAD were also used to assess the status of cycling and parking policy, respectively. It is especially important to emphasize that Podgorica is the first city in the West Balkans, and the fourth city in Europe, in which the ParkPAD tool was applied. A wide range of negative phenomena and trends was identified, like a rapid increase in the number of registered vehicles, an increase in the motorization rate and the number of traffic accidents, increased non-compliance with traffic rules, excessive use of passenger cars and auto-taxi vehicles, insufficient use of unattractive public transport, walking and cycling, etc. Based on the data collected, key challenges in status analysis in Podgorica were identified, which the SUMP should try to overcome.

scholarly journals Mineral Physicochemistry Underlying Feature-Based Extraction of Mineral Abundance and Composition from Shortwave, Mid and Thermal Infrared Reflectance Spectra

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 347
Author(s):  
Carsten Laukamp ◽  
Andrew Rodger ◽  
Monica LeGras ◽  
Heta Lampinen ◽  
Ian C. Lau ◽  
...  
Keyword(s):  
Mineral Exploration ◽  
Relevant Information ◽  
Ore Deposits ◽  
Reflectance Spectra ◽  
Full Potential ◽  
Infrared Reflectance ◽  
Vibrational Modes ◽  
Diagnostic Features ◽  
Wide Range ◽  
Mineral Assemblages

Reflectance spectroscopy allows cost-effective and rapid mineral characterisation, addressing mineral exploration and mining challenges. Shortwave (SWIR), mid (MIR) and thermal (TIR) infrared reflectance spectra are collected in a wide range of environments and scales, with instrumentation ranging from spaceborne, airborne, field and drill core sensors to IR microscopy. However, interpretation of reflectance spectra is, due to the abundance of potential vibrational modes in mineral assemblages, non-trivial and requires a thorough understanding of the potential factors contributing to the reflectance spectra. In order to close the gap between understanding mineral-diagnostic absorption features and efficient interpretation of reflectance spectra, an up-to-date overview of major vibrational modes of rock-forming minerals in the SWIR, MIR and TIR is provided. A series of scripts are proposed that allow the extraction of the relative intensity or wavelength position of single absorption and other mineral-diagnostic features. Binary discrimination diagrams can assist in rapidly evaluating mineral assemblages, and relative abundance and chemical composition of key vector minerals, in hydrothermal ore deposits. The aim of this contribution is to make geologically relevant information more easily extractable from reflectance spectra, enabling the mineral resources and geoscience communities to realise the full potential of hyperspectral sensing technologies.

Thermal analysis method of electromagnetic linear actuator based on multiphysics coupling model

2021 ◽  
pp. 1-17
Author(s):  
Geng Wang ◽  
Renjing Gao ◽  
Qi Wang ◽  
Shutian Liu
Keyword(s):  
Thermal Analysis ◽  
Thermal Characteristics ◽  
Coupling Model ◽  
Analysis Method ◽  
Thermal Analysis Method ◽  
Performance Requirements ◽  
Wide Range ◽  
Multiphysics Coupling ◽  
Simulation And Experiment ◽  
Electromagnetic Linear Actuator

Electromagnetic linear actuators (ELAs) may be confronted with unsatisfactory performance when subjected to overheating. Therefore, it is significant to clarify its thermal characteristics and design the thermal performance requirements. A thermal analysis method based on multiphysics coupling model was presented, which uses the non-simplified loss distribution as the heat source to calculate the temperature field, adjusts the material properties by temperature, and considers the interaction between motion (including impact) and loss. More importantly, an improved universal equivalent winding to satisfy the condition of real compact concentrated winding was developed. Finally, the validity of this approach was verified through the experiment, and the regularity of temperature was summarized. The results show that the error of simulation and experiment is less than 6% and the permissible continuous operation frequency is no more than 30 Hz. The approach proposed in this paper can be employed not only to the ELA, but also to the design and analysis a wide range of electromagnetic machines.

scholarly journals Teaching Critical Vocabulary to Filipino Heritage Language Learners

2021 ◽  
Vol 11 (6) ◽  
pp. 260
Author(s):  
Jayson Parba
Keyword(s):  
Language Development ◽  
Social Issues ◽  
Language Teaching ◽  
Language Teachers ◽  
World Language ◽  
Wide Range ◽  
Teachers And Students ◽  
The Status ◽  
Language Classrooms ◽  
L1 And L2

Engaging in critical dialogues in language classrooms that draw on critical pedagogical perspectives can be challenging for learners because of gaps in communicative resources in their L1 and L2. Since critically oriented classrooms involve discussing social issues, students are expected to deploy “literate talk” to engage in critiquing society and a wide range of texts. Although recent studies have explored teachers’ and students’ engagement with critical materials and critical dialogues, research that explores language development in critical language teaching remains a concern for language teachers. In this paper, I share my experience of fostering language development, specifically the overt teaching of critical vocabulary to students of (Tagalog-based) Filipino language at a university in Hawai’i. Through a discussion of racist stereotypes targeting Filipinos and the impacts of these discourses on students’ lived experiences, the notion of “critical vocabulary” emerges as an important tool for students to articulate the presence of and to dismantle oppressive structures of power, including everyday discourses supporting the status quo. This paper defines critical vocabulary and advances its theoretical and practical contribution to critical language teaching. It also includes students’ perspectives of their language development and ends with pedagogical implications for heritage/world language teachers around the world.

Molecular markers and antioxidant activity in berry crops: Genetic diversity analysis

2012 ◽  
Vol 92 (6) ◽  
pp. 1121-1133 ◽  
Author(s):  
S. C. Debnath ◽  
Y. L. Siow ◽  
J. Petkau ◽  
D. An ◽  
N. V. Bykova
Keyword(s):  
Genetic Diversity ◽  
Antioxidant Activity ◽  
Molecular Markers ◽  
Molecular Techniques ◽  
Diversity Analysis ◽  
Full Potential ◽  
Genetic Diversity Analysis ◽  
Wide Range ◽  
Berry Crops ◽  
Improvement Programs

Debnath, S. C., Siow, Y. L., Petkau, J., An, D. and Bykova, N. V. 2012. Molecular markers and antioxidant activity in berry crops: Genetic diversity analysis. Can. J. Plant Sci. 92: 1121–1133. An improved understanding of important roles of dietary fruits in maintaining human health has led to a dramatic increase of global berry crop production. Berry fruits contain relatively high levels of vitamin C, cellulose and pectin, and produce anthocyanins, which have important therapeutic values, including antitumor, antiulcer, antioxidant and anti-inflammatory activities. There is a need to develop reliable methods to identify berry germplasm and assess genetic diversity/relatedness for dietary properties in berry genotypes for practical breeding purposes through genotype selection in a breeding program for cultivar development, and proprietary-rights protection. The introduction of molecular biology techniques, such as DNA-based markers, allows direct comparison of different genetic materials independent of environmental influences. Significant progress has been made in diversity analysis of wild cranberry, lowbush blueberry, lingonberry and cloudberry germplasm, and in strawberry and raspberry cultivars and advanced breeding lines developed in Canada. Inter simple sequence repeat (ISSR) markers detected an adequate degree of polymorphism to differentiate among berry genotypes, making this technology valuable for cultivar identification and for the more efficient choice of parents in the current berry improvement programs. Although multiple factors affect antioxidant activity, a wide range of genetic diversity has been reported in wild and cultivated berry crops. Diversity analysis based on molecular markers did not agree with those from antioxidant activity. The paper also discusses the issues that still need to be addressed to utilize the full potential of molecular techniques including expressed sequence tag-polymerase chain reaction (EST-PCR) analysis to develop improved environment-friendly berry cultivars suited to the changing needs of growers and consumers.

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