检索结果-南通市图书馆

Acta Geochimica 2016年第3期35卷 240-250页

作者： Xiaohang Xu Na Liu Matthew s.landis Xinbin Feng Guangle Qiu state Key Laboratory of Environmental Geochemistry Institute of GeochemistryChinese Academy of SciencesGuiyang 550081People's Republic of China University of Chinese Academy of sciences Beijing 100049People's Republic of China Us EPA Office of Research and DevelopmentResearchTriangle ParkDurhamNC 27709USA

Continuous measurements of speciated atmo- spheric mercury （Hg）, including gaseous elemental mer- cury （GEM）, particulate mercury （PHg）, and reactive gaseous mercury （RGM） were conducted in Guizhou Pro- vince, southwestern China. Guiyang Power Plant （GPP）, Guiyang Wujiang Cement Plant, Guizhou Aluminum Plant （GAP）, and Guiyang Forest Park （GFP） in Guiyang were selected as study sites. Automatic Atmospheric Mercury speciation Analyzers （Tekran 2537A） were used for GEM analysis. PHg and RGM were simultaneously collected by a manual sampling system, including elutriator, coupler/ impactor, KCl-coated annular denuder, and a filter holder. Results show that different emission sources dominate different species of Hg. The highest average GEM value was 22.2 ±28.3 ng·m-3 and the lowest 6.1 ± 3.9 ng·m-3, from samples collected at GPP and GAP, respectively. The maximum average PHg was 1984.9 pg·m-3 and the mini- mum average 55.9 pg·m-3, also from GPP and GAP, respectively. similarly, the highest average RGM of 68.8 pg·m-3 was measured at GPP, and the lowest level of 20.5 pg·m-3 was found at GAP. We conclude that coal combustion sources are still playing a key role in GEM; traffic contributes significantly to PHg; and domestic pol- lution dominates RGM.

关键词： Atmospheric mercury speciation Anthropogenic sources GEM - PHg RGM

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

在线全文

学校读者我要写书评

暂无评论

半导体技术 2004年第7期29卷 86-91页

作者： R. Pelzer P. Lindner T. Glinsner B.Vratzov C.Gourgon s.landis P. Kettner C. schaefer EV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingAMICA AMO GmbH Huysensweg 25 D-52074 AachenLaboratoire des Technologies de la Microelectronique CNRS 17 R. des MartyrsF- 3805Grenoble Cedex4CEA-LETI 17 R. des Martyrs F- 38054 Grenoble CedexEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 Schaerding

Nanoimprint Lithography has been demon-strated to be one of the most promising next genera-tion techniques for large-area structure replicationin the nanometer scale. This fast and low costmethod becomes an increasingly important instru-ment for fabrication of biochemistry,m-fluidic, m-TAs and telecommunication devices, as well as for awide variety of fields in the nm range, like biomedical,nano-fluidics,nano-optical applications, datastorage, *** to the restrictions on wavelength and theenormous development works, linked to high pro-cess and equipment costs on standard lithographysystems, nanoimprint lithography might become areal competitive method in mainstream IC *** are no physical limitations encountered withimprinting techniques for much smaller replicatedstructures, down to the sub-10nm range [1]. Amongseveral Nanoimprint lithography techniques resultsof two promising methods, hot embossing lithogra-phy (HEL) and UV-nanoimprinting (UV-NIL) will bepresented. Both techniques allow rapid prototypingas well as high volume production of fully patternedsubstrates for a wide range of *** paper will present results on HE and UV-NIL, among them full wafer imprints up to 200mmwith high-resolution patterns down to nm range.

关键词：光刻 HEL UV-NIL MCP 光对准

纳米压印光刻技术——下一代批量生产的光刻技术(英文)

在线全文

学校读者我要写书评

暂无评论

电子工业专用设备 2004年第7期33卷 3-9页

作者： R.Pelzer P.Lindner T.Glinsner B.Vratzov C.Gourgon s.landis P.Kettner C.schaefer EV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingAMICA AMO GmbH Huysensweg 25 D-52074 AachenLaboratoire des Technologies de la Microelectronique-CNRS 17 R. des MartyrsF-38054 Grenoble CedexCEA-LETI17 R.des Martyrs F-38054 Grenoble CedexEV Group DI Erich Thallner Strasse 1 A-4780 SchaerdingEV Group DI Erich Thallner Strasse 1 A-4780 Schaerding

纳米压印光刻技术已被证实是纳米尺寸大面积结构复制的最有前途的下一代技术之一。这种速度快、成本低的方法成为生物化学、μ级流化学、μ-TAs和通信器件制造以及纳米尺寸范围内广泛应用的一种日渐重要的方法,如生物医学、纳米流体学... 详细信息

纳米压印光刻技术已被证实是纳米尺寸大面积结构复制的最有前途的下一代技术之一。这种速度快、成本低的方法成为生物化学、μ级流化学、μ-TAs和通信器件制造以及纳米尺寸范围内广泛应用的一种日渐重要的方法,如生物医学、纳米流体学、纳米光学应用、数据存储等领域。由于标准光刻系统的波长限制、巨大的开发工作量、以及高昂的工艺和设备成本,纳米压印光刻技术可能成为主流IC产业中一种真正富有竞争性方法。对细小到亚10nm范围内的极小复制结构,纳米压印技术没有物理极限。从几种纳米压印光刻技术中选择两种前景广阔的方法——热压印光刻(HEL)和紫外压印光刻(UV-NIL)技术给予介绍。两种技术对各种各样的材料以及全部作图的衬底大批量生产提供了快速印制。重点介绍了HEL和UV-NIL两种技术的结果。全片压印尺寸达200mm直径,图形分辨力高,拓展到纳米尺寸范围。

关键词：纳米压印技术热压印紫外压印电铸光刻

使用直接作用抗病毒药物实现持续病毒学应答后的新发肝细胞癌的发生率和预测因素:来自吉利德svr和肝硬化登记处的结果

在线全文

学校读者我要写书评

暂无评论

使用直接作用抗病毒药物实现持续病毒学应答后的新发肝细胞癌的发...

A case for systemic environmental analysis of cultured meat

第十届全国疑难及重症肝病大会

作者： K.Rajender REDDY Ira M.Jacobson Armand Abergel Barbara A.Leggett Charles s.landis Robert Hyland Frances Chen Liyun Ni Anu O.Osinusi Diana Brainard Jose Luis Calleja Eric J.Lawitz Andrew Joseph Muir Alessandra Mangia UniversityofPennsylvania QIMRBerghoferMedicalResearchInstitute UniversityofWashington CentroDeInvestigacionBiomedicaEnRedDeEnfermedadesHepaticasyDigestivas(CIBERehd) Irccs-OspedaleCasasollievoDellasofferenza CHUClermontFerrand GileadsciencesInc. DukeClinicalResearchInstitute NewYorkUniversity Gileadsciences Inc. TexasLiverInstitute UniversityofTexasHealthSanAntonio

背景一些研究表明,使用直接作用抗病毒药物(DAA)实现持续病毒学应答(sVR)与肝细胞癌(HCC)发生的减少相关。本研究评估了在吉利德登记处的一支包括6700余名患者的特征良好的队列中的sVR后新发HCC的发生率和预测因素。方法本研究进行了一...

背景一些研究表明,使用直接作用抗病毒药物(DAA)实现持续病毒学应答(sVR)与肝细胞癌(HCC)发生的减少相关。本研究评估了在吉利德登记处的一支包括6700余名患者的特征良好的队列中的sVR后新发HCC的发生率和预测因素。方法本研究进行了一项汇总分析,评估了吉利德sVR和肝硬化登记处的患者中的新发HCC的

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2015年第2期14卷 249-254页

作者： Carolyn s Mattick Amy E landis Braden R Allenby University of Texas school of Public Health 1200 Hermann Pressler DriveHouston TX 77030 USA school of sustainable Engineering and the Built Environment Arizona State UniversityTempe AZ PO Box 875306 USA

The environmental implications of cultured meat are profound. An anticipatory life cycle assessment of cultured meat published in 2011 suggested it could have a smaller impact than agricultural meat in all categories except energy consumption. As with most technologies, cultured meat will almost certainly be accompanied by unintended consequences as well as unforeseen costs and benefits that accrue disproportionately to different stakeholders. Uncertainty associated with new engineered products cannot be completely eliminated prior to introduction, but ongoing environmental assessments of the technologies as they advance can serve to reduce unforeseen risks. Given the pace at which tissue engineering is advancing, systemic assessments of the technology will be pivotal in mitigating unintended environmental consequences.

关键词： cultured meat in vitro meat factory-grown food anticipatory life cycle assessment systemic environmental implications of emerging technologies

Experimental investigations of internal energy dissipation during fracture of fiber-reinforced ultra-high-performance concrete

在线全文

学校读者我要写书评

暂无评论

Frontiers of structural and Civil Engineering 2019年第1期13卷 190-200页

作者： Eric N.landis Roman KRAVCHUK Dmitry LOsHKOV Department of Civil &Environmental Engineering University of MaineOronoME 04469USA

split-cylinder fracture of fiber-reinforced ultra-high-performance concrete (UHPC)was examined using two complementary techniques:X-ray computed tomography (CT)and acoustic emission (AE).Fifty-mm-diameter specimens of two different fiber types were scanned both before and after load *** the CT images,fiber orientation was evaluated to establish optimum and pessimum specimen orientations,at which fibers would have maximum and minimum effect,*** expected,fiber orientation affected both the peak load and the toughness of the specimen,with the optimum toughness being between 20% and 30%higher than the *** AE energy was also affected *** CT scans of the specimens were used to measure internal damage. Damage was quantified in terms of internal energy dissipation due to both matrix cracking and fiber pullout by using calibration measurements for *** results showed that fiber pullout was the dominant energy dissipation mechanism;however,the sum of the internal energy dissipation measured amounted to only 60% of the total energy dissipated by the specimens as measured by the net work of *** is postulated that localized compaction of the UHPC matrix as well as internal friction between fractured fragments makes up the balance of internal energy dissipation.

关键词： ultra-high-performance concrete concrete fracture X-ray computed tomography acoustic emission

Chemical characterization and sources of PM2.5 at 12-h resolution in Guiyang, China

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2018年第2期37卷 334-345页

作者： Longchao Liang Na Liu Matthew s. landis Xiaohang Xu Xinbin Feng Zhuo Chen Lihai shang Guangle Qiu Guizhou University Guiyang 550025 China state Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550081 China Guizhou Normal University Guiyang 550001 China U.s. EPA Office of Research and Development Research Triangle Park Durham NC 27709 USA

The increasing emission of primary and gaseous precursors of secondarily formed atmospheric particulate matter due to continuing industrial development and urbanization are leading to an increased public awareness of environmental issues and human health risks in China. As part of a pilot study, 12-h integrated fine fraction particulate matter （PM2.5） filter samples were collected to chemically characterize and investigate the sources of ambient particulate matter in Guiyang City, Guizhou Province, southwestern China. Results showed that the 12-h integrated PM2.5 concentrations exhibited a daytime average of 51 ± 22 μg m^-3 （mean -4- standard deviation） with a range of 17-128 μg m^-3 and a nighttime average of 55 ± 32 μg m^-3 with a range of 4-186 μg m^-3. The 24-h integrated PM2.5 concentrations varied from 15 to 157 μg m^-3, with amean value of 53 ± 25 μg m^-3, which exceeded the 24-h PM2.5 standard of 35μg m^-3 set by UsEPA, but was below the standard of 75 μg m^-3, set by China Ministry of Environmental Protection. Energy-dispersive X-ray fluorescence spectrometry （XRF） was applied to determine PM2.5 chemical element concentrations. The order of concentrations of heavy metals in PM2.5 were iron （Fe）〉 zinc （Zn）〉 manganese （Mn）〉 lead （Pb）〉 arsenic （As）〉 chromium （Cr）. The total concentration of 18 chemical elements was 13 ± 2 μg m^-3, accounting for 25% in PM2.5, which is comparable to other major cities in China, but much higher than cities outside of China.

关键词： Trace elements PM2.5 source apportionment

A comparison of the relative efficiency of ICsI and extended culture with epididymal sperm versus testicular sperm in patients with obstructive azoospermia

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2020年第2期22卷 222-226页

作者： scott J Morin Brent M Hanson Caroline R Juneau shelby A Neal Jessica N landis Richard T scott Jr James M Hotaling Reproductive Medicine Associates of New Jersey 140 Allen RoadBasking RidgeNJ 07920USA Division of Reproductive Endocrinology and Infertility Department of Obstetrics and GynecologySidney Kimmel Medical College at Thomas Jefferson University833 Chestnut StreetPhiladelphiaPA 19107USA Foundation for Embryonic Competence 140 Allen RoadBasking RidgeNJ 07920USA Division of Urology Department of SurgeryUniversity of Utah School of Medicine30 N 1900 ESalt Lake CityUT 84132USA Department of Obstetrics and Gynecology University of Utah School of Medicine30 N 1900 ESalt Lake CityUT 84132USA.An abbreviated version of this manuscript was published and presented as an abstract at the American Society for Reproductive Medicine(ASRM)2017 Scientific Congress.

This is a retrospective cohort study comparing blastocyst transfer outcomes following intracytoplasmic sperm injection utilizing epididymal versus testicular sperm for men with obstructive *** cases at a single center between 2012 and 2016 were *** approach was selected at the surgeon’s discretion and included microepididymal sperm aspiration or testicular sperm *** culture was exclusively utilized prior to *** primary outcome was live birth *** outcomes included fertilization rate,blastulation rate,euploidy rate,and implantation rate.A mixed effects model was ***-six microepididymal sperm aspiration cases and 93 testicular sperm extraction cases were *** live birth rate was equivalent(48.6%vs 50.5%,P=0.77).However,on mixed effects model,epididymal sperm resulted in a greater likelihood of fertilization(adjusted OR:1.37,95%CI:1.05–1.81,P=0.02)and produced a higher blastulation rate(adjusted OR:1.41,95%CI:1.1–1.85,P=0.01).As a result,the epididymal sperm group had more supernumerary blastocysts available(4.3 vs 3,Ps no *** rates were no different through the first transfer ***,intracytoplasmic sperm injection following microepididymal sperm aspiration resulted in a greater number of usable blastocysts per ***,the true benefit of epididymal sperm may only be demonstrated via a comparison of cumulative pregnancy rates after multiple transfers from one cohort.

关键词： azoospermia intracytoplasmic sperm injection male infertility testicular sperm extraction

Phylogenetic patterns suggest frequent multiple origins of secondary metabolites across the seed-plant ‘tree of life’

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National science Review 2021年第4期8卷 66-77页

作者： Yongzeng Zhang Tao Deng Lu sun Jacob B.landis Michael J.Moore Hengchang Wang Yuehua Wang Xiaojiang Hao Jijun Chen shenghong Li Maonian Xu Pema-Tenzin Puno Peter H.Raven Hang sun CAs Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of Botany Chinese Academy of Sciences University of the Chinese Academy of sciences Department of Botany and Plant sciences University of California Riverside school of Integrative Plant science Section of Plant Biology and the L.H.Bailey HortoriumCornell University Department of Biology Oberlin College CAs Key Laboratory of Plant Germplasm Enhancement and specialty Agriculture Chinese Academy of Sciences school of Life science Yunnan University state Key Laboratory of Phytochemistry and Plant Resources in West China Kunming Institute of BotanyChinese Academy of Sciences Pharmaceutical sciences University of Iceland Missouri Botanical Garden

To evaluate the phylogenetic patterns of the distribution and evolution of plant secondary metabolites(PsMs), we selected 8 classes of PsMs and mapped them onto an updated phylogenetic tree including 437 families of seed plants. A significant phylogenetic signal was detected in 17 of the 18 tested seed-plant clades for at least 1 of the 8 PsM classes using the D statistic. The phylogenetic signal, nevertheless, indicated weak clustering of PsMs compared to a random distribution across all seed plants. The observed signal suggests strong diversifying selection during seed-plant evolution and/or relatively weak evolutionary constraints on the evolution of PsMs. In the survey of the current phylogenetic distributions of PsMs, we found that multiple origins of PsM biosynthesis due to external selective forces for diverse genetic pathways may have played important roles. In contrast, a single origin of PsMs seems rather uncommon. The distribution patterns for PsMs observed in this study may also be useful in the search for natural compounds for medicinal purposes.

关键词： secondary metabolites phylogenetic tree phylogenetic signal co-diversification evolution bioprospecting seed plants

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

全球公共产品与世界最贫困者的健康(英文)

全球公共产品与世界最贫困者的健康(英文)