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Johnson-Arbor, Kelly,Schultz, Brian The Korean Society for Preventive Medicine 2021 Journal of Preventive Medicine and Public Health Vol.54 No.5
Elemental mercury exposure can result in significant toxicity. Source decontamination and remediation are often required after larger elemental mercury exposures, but the details of these processes are infrequently reported. In the case described herein, a 64-year-old woman and her husband were exposed to elemental mercury in their home after the husband purchased it online for the purpose of recreational barometer calibration. After the mercury reportedly spilled during the calibration process, a vacuum cleaner was used to decontaminate the affected surface; this led to extensive mercury contamination of the home. The couple was relocated from the home while remediation occurred over the course of several weeks. Vacuum cleaning of an elemental mercury spill can lead to extensive volatilization and recirculation of mercury vapor. For smaller mercury spills, careful removal of visible mercury beads by using an eyedropper, cardboard, and masking tape is recommended. Larger spills require professional decontamination and remediation and may necessitate involvement of governmental resources. Vacuum cleaning should not be used as an initial method of decontamination after elemental mercury exposure. Careful attention to source decontamination can reduce the emotional and financial costs associated with extensive remediation after elemental mercury exposure.
기상레이더와 지형정보시스템을 이용한 분포형 강우-유출 유역모형의 개발과 검정
Skahill Brian E.,Choi Woo-Hee,Kim Min-Hwan,Kim Sung-Kyun,Johnson Lynn E. 한국수자원학회 2003 한국수자원학회논문집 Vol.36 No.2
기상레이더와 지형정보 시스템을 이용한 홍수사상에 기초하고, 운동역학적이며, 초과강우가 고려된 분포형 강우-유출 유역모형이 개발되었다. 이 유역모형에서 강우로 인한 지표면 유출 및 지표면 흐름과 관련된 각종 변수의 공간적 변동성과 불확실성을 인식하고 설명한다. 개발된 모형은 래스터 지형정보시스템과 공간적·시간적으로 변하는 강우자료와 호환된다. 몬테칼로 모의와 우도값이 이 모형의 검정을 위하여 이용되었으며, 검정 모형으로부터 반응되는 시스템의 가능범위가 허
A Modular-based Miniature Mobile Robot for Pervasive Computing
Yan Meng,Kerry Johnson,Brian Simms,Matthew Conforth 보안공학연구지원센터 2008 International Journal of Hybrid Information Techno Vol.1 No.1
Increasingly, innovations in miniaturization and embedded systems are making pervasive computing a reality. Meanwhile, similar advancements in robotics have made autonomous mobile robots easier to develop and more cost-efficient. However, since the field of ubiquitous robotics remains relatively unexplored, we develop SMARbot (Stevens Modular Autonomous Robot), as a tool to explore the pervasive capability of miniature robots. The SMARTBot was designed to be a highly modular, adaptable, inexpensive base model to integrate miniature mobile robots into the pervasive computing environment. The hardware and software architecture of the prototype are proposed. The experimental results demonstrate the feasibility and efficiency of the SMARbot in the real-world scenarios
Design of a direct-cycle supercritical CO2 nuclear reactor with heavy water moderation
Robert Petroski,Ethan Bates,Benoit Dionne,Brian Johnson,Alex Mieloszyk,Cheng Xu,Pavel Hejzlar 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
A new reactor concept is described that directly couples a supercritical CO2 (sCO2) power cycle with aCO2-cooled, heavy water moderated pressure tube core. This configuration attains the simplification andeconomic potential of past direct-cycle sCO2 concepts, while also providing safety and power densitybenefits by using the moderator as a heat sink for decay heat removal. A 200 MWe design is describedthat heavily leverages existing commercial nuclear technologies, including reactor and moderator systemsfrom Canadian CANDU reactors and fuels and materials from UK Advanced Gas-cooled Reactors(AGRs). Descriptions are provided of the power cycle, nuclear island systems, reactor core, and safetysystems, and the results of safety analyses are shown illustrating the ability of the design to withstandlarge-break loss of coolant accidents. The resulting design attains high efficiency while employingconsiderably fewer systems than current light water reactors and advanced reactor technologies, illustratingits economic promise. Prospects for the design are discussed, including the ability to demonstrateits technologies in a small (~20 MWe) initial system, and avenues for further improvement of the designusing advanced technologies.
Thermoneutrality but Not UCP1 Deficiency Suppresses Monocyte Mobilization Into Blood
Williams, Jesse W.,Elvington, Andrew,Ivanov, Stoyan,Kessler, Skyler,Luehmann, Hannah,Baba, Osamu,Saunders, Brian T.,Kim, Ki-Wook,Johnson, Michael W.,Craft, Clarissa S.,Choi, Jae-Hoon,Sorci-Thomas, Mar Grune & Stratton 2017 Circulation research Vol.121 No.6
<P>Conclusions: Warm ambient temperature is, like UCP1 deficiency, atheroprotective, but the mechanisms of action differ. Thermoneutrality associates with reduced monocyte egress from the bone marrow in a UCP1-dependent manner in mice and likewise may also suppress blood monocyte counts in man.</P>
( Dennis K Bideshi ),( Greer Waldrop ),( Maria Teresa Fernandez Luna ),( Mercedes Diaz Mendoza ),( Margaret C Wirth ),( Jeffrey J Johnson ),( Hyun Woo Park ),( Brian A Federici ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.8
The Cyt1Aa protein of Bacillus thuringiensis susbp. israelensis elaborates demonstrable toxicity to mosquito larvae, but more importantly, it enhances the larvicidal activity of this species Cry proteins (Cry11Aa, Cry4Aa, and Cry4Ba) and delays the phenotypic expression of resistance to these that has evolved in Culex quinquefasciatus. It is also known that Cyt1Aa, which is highly lipophilic, synergizes Cry11Aa by functioning as a surrogate membrane-bound receptor for the latter protein. Little is known, however, about whether Cyt1Aa can interact similarly with other Cry proteins not primarily mosquitocidal; for example, Cry2Aa, which is active against lepidopteran larvae, but essentially inactive or has very low toxicity to mosquito larvae. Here we demonstrate by ligand binding and enzyme-linked immunosorbent assays that Cyt1Aa and Cry2Aa form intermolecular complexes in vitro, and in addition show that Cyt1Aa facilitates binding of Cry2Aa throughout the midgut of C. quinquefasciatus larvae. As Cry2Aa and Cry11Aa share structural similarity in domain II, the interaction between Cyt1Aa and Cry2Aa could be a result of a similar mechanism previously proposed for Cry11Aa and Cyt1Aa. Finally, despite the observed interaction between Cry2Aa and Cyt1Aa, only a 2-fold enhancement in toxicity resulted against C. quinquefasciatus. Regardless, our results suggest that Cry2Aa could be a useful component of mosquitocidal endotoxin complements being developed for recombinant strains of B. thuringiensis subsp. israelensis and B. sphaericus aimed at improving the efficacy of commercial products and avoiding resistance.
GLOBULAR AND OPEN CLUSTERS OBSERVED BY SDSS/SEGUE: THE GIANT STARS
Morrison, Heather L.,Ma, Zhibo,Clem, James L.,An, Deokkeun,Connor, Thomas,Schechtman-Rook, Andrew,Casagrande, Luca,Rockosi, Constance,Yanny, Brian,Harding, Paul,Beers, Timothy C.,Johnson, Jennifer A. American Astronomical Society 2016 The Astronomical journal Vol.151 No.1
<P>We present griz observations for the clusters M92, M13 and NGC 6791 and gr photometry for M71, Be 29 and NGC 7789. In addition we present new membership identifications for all these clusters, which have been observed spectroscopically as calibrators for the Sloan Digital Sky Survey (SDSS)/SEGUE survey; this paper focuses in particular on the red giant branch stars in the clusters. In a number of cases, these giants were too bright to be observed in the normal SDSS survey operations, and we describe the procedure used to obtain spectra for these stars. For M71, we also present a new variable reddening map and a new fiducial for the gr giant branch. For NGC 7789, we derived a transformation from T-eff to g-r for giants of near solar abundance, using IRFM T-eff measures of stars with good ugriz. and 2MASS photometry and SEGUE spectra. The result of our analysis is a robust list of known cluster members with correctly dereddened and (if needed) transformed gr photometry for crucial calibration efforts for SDSS and SEGUE.</P>
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.