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Hydrophobization of cotton fabric by Gliding Arc plasma discharge
Pavel Cerny,Petr Bartos,Pavel Olsan,Petr Spatenka 한국물리학회 2019 Current Applied Physics Vol.19 No.2
The surface modification in order to obtain hydrophobic cotton fabrics was carried out using air/HMDSO Gliding Arc plasma discharge. The dependence of the surface wettability on used process parameters, such as air flow, sample distance and treatment time were investigated. The wettability of cotton fabrics was evaluated by the drop test method by measuring the time of droplet absorption and water contact angle (WCA). The changes in the surface morphology were examined by optical microscopy and scanning electron microscopy (SEM). The treated hydrophobic fabrics were subjected to the analysis of chemical composition of the applied coatings using the ATR-FTIR spectroscopy. Hydrophobic cotton fabrics were obtained, especially with a high resistance to static wetting. In addition, the treated cotton fabrics were tested using a spray test measurement and were subjected to multiple washing.
음원 파라미터 모델과 인공신경망을 이용한 음성장애 검출
파벨 시틸(Pavel Chytil),조철우(Cheolwoo Jo),미샤 파벨(Misha Pavel) 한국음성학회 2008 음성과학 Vol.15 No.2
There is a number of clinical conditions that affect directly or indirectly the physical properties of the vocal folds and thereby the pressure waveforms of elicited sounds. If the relationships between the clinical conditions and the voice quality are sufficiently reliable, it should be possible to detect these diseases or disorders. The focus of this paper is to determine the set of features and their values that would characterize the speaker’s state of vocal folds. To the extent that these features can capture the anatomical, physiological, and neurological aspects of the speaker they can be potentially used to mediate an unobtrusive approach to diagnosis. We will show a new approach to this problem supported with results obtained from two disordered voice corpora.
Russia as a Security Disaster Area: Possible Conflicts and Interventions in 2015
( Pavel K Baev ) 한국국방연구원 2002 The Korean Journal of Defense Analysis Vol.14 No.1
The fluid state of the system of international relations in the middle of the global war against terrorism increases the need to undertake risk analysis of the options that until recently could have been dismissed as improbable. This article takes a deliberately pessimistic view on Russia, which continues to be a source of major security challenges, and attempts to measure the scale of possible disasters in medium-long perspective. This country, despite its present-day semblance of stability, may see a chain of violent conflicts engulfing the most vulnerable parts of its vast periphery - and some of those may pose such risks to international peace and security that external interventions might become necessary. The analysis examines the elements of the basic scenario of gradual erosion of the central authority in Russia under the impact of centrifugal forces and identifies a number of possible flash-points in the North, South, West and Far East of the country. The requirements for, and formats of external armed interventions in these low-intensity but high-risk conflicts are evaluated, while the fundamental issue of whether the West would be politically willing and militarily capable of performing any of the described interventions is deliberately left out.
TerraPower, LLC Traveling Wave Reactor Development Program Overview
PAVEL HEJZLAR,Rovert Petroski,Jesse Cheatham,Nick Touran,Michael Cohen,Bao Truong,Ryan Latta,Mark Werner,Tom Burke,Jay Tandy,Mike Gattett,Brian Johnson,Tyler Ellis,Jon Mcwhirter,Ash Odedra,Pat Schweig 한국원자력학회 2013 Nuclear Engineering and Technology Vol.45 No.6
Energy security is a topic of high importance to many countries throughout the world. Countries with access to vast energy supplies enjoy all of the economic and political benefits that come with controlling a highly sought after commodity. Given the desire to diversify away from fossil fuels due to rising environmental and economic concerns, there are limited technology options available for baseload electricity generation. Further complicating this issue is the desire for energy sources to be sustainable and globally scalable in addition to being economic and environmentally benign. Nuclear energy in its current form meets many but not all of these attributes. In order to address these limitations, TerraPower, LLC has developed the Traveling Wave Reactor (TWR) which is a near-term deployable and truly sustainable energy solution that is globally scalable for the indefinite future. The fast neutron spectrum allows up to a ~30-fold gain in fuel utilization efficiency when compared to conventional light water reactors utilizing enriched fuel. When compared to other fast reactors, TWRs represent the lowest cost alternative to enjoy the energy security benefits of an advanced nuclear fuel cycle without the associated proliferation concerns of chemical reprocessing. On a country level, this represents a significant savings in the energy generation infrastructure for several reasons 1) no reprocessing plants need to be built, 2) a reduced number of enrichment plants need to be built, 3) reduced waste production results in a lower repository capacity requirement and reduced waste transportation costs and 4) less uranium ore needs to be mined or purchased since natural or depleted uranium can be used directly as fuel. With advanced technological development and added cost, TWRs are also capable of reusing both their own used fuel and used fuel from LWRs, thereby eliminating the need for enrichment in the longer term and reducing the overall societal waste burden. This paper describes the origins and current status of the TWR development program at TerraPower, LLC. Some of the areas covered include the key TWR design challenges and brief descriptions of TWR-Prototype (TWR-P) reactor. Selected information on the TWR-P core designs are also provided in the areas of neutronic, thermal hydraulic and fuel performance. The TWR-P plant design is also described in such areas as; system design descriptions, mechanical design, and safety performance. Energy security is a topic of high importance to many countries throughout the world. Countries with access to vast energysupplies enjoy all of the economic and political benefits that come with controlling a highly sought after commodity. Given thedesire to diversify away from fossil fuels due to rising environmental and economic concerns, there are limited technologyoptions available for baseload electricity generation. Further complicating this issue is the desire for energy sources to besustainable and globally scalable in addition to being economic and environmentally benign. Nuclear energy in its currentform meets many but not all of these attributes. In order to address these limitations, TerraPower, LLC has developed theTraveling Wave Reactor (TWR) which is a near-term deployable and truly sustainable energy solution that is globally scalablefor the indefinite future. The fast neutron spectrum allows up to a ~30-fold gain in fuel utilization efficiency when compared toconventional light water reactors utilizing enriched fuel. When compared to other fast reactors, TWRs represent the lowestcost alternative to enjoy the energy security benefits of an advanced nuclear fuel cycle without the associated proliferationconcerns of chemical reprocessing. On a country level, this represents a significant savings in the energy generationinfrastructure for several reasons 1) no reprocessing plants need to be built, 2) a reduced number of enrichment plants need tobe built, 3) reduced waste production results in a lower repository capacity requirement and reduced waste transportation costsand 4) less uranium ore needs to be mined or purchased since natural or depleted uranium can be used directly as fuel. Withadvanced technological development and added cost, TWRs are also capable of reusing both their own used fuel and used fuelfrom LWRs, thereby eliminating the need for enrichment in the longer term and reducing the overall societal waste burden. This paper describes the origins and current status of the TWR development program at TerraPower, LLC. Some of the areascovered include the key TWR design challenges and brief descriptions of TWR-Prototype (TWR-P) reactor. Selectedinformation on the TWR-P core designs are also provided in the areas of neutronic, thermal hydraulic and fuel performance. The TWR-P plant design is also described in such areas as; system design descriptions, mechanical design, and safetyperformance.