检索结果-南通市图书馆

Creating.heralded hyper-entang.ed photons using.Rydberg.atoms

在线全文

学校读者我要写书评

暂无评论

Lig.t(Science & Applications) 2021年第7期10卷 1227-1235页

作者： Sutapa g.osh Nicholas Rivera g.di eisenstein Ido Kaminer Andrew and Erna Viterby Department of Electrical Eng.neering.and Russell Berrie Nanotechnolog. Institute Technion-Israel Institute of TechnologyHaifa 32000Israel Department of Physics Massachusetts Institute of TechnologyCambridgeMAUSA

Entang.ed photon pairs are a fundamental component for testing.the foundations of quantum mechanics,and for modern quantum technolog.es such as teleportation and secured *** state-of-the-art sources are based on nonlinear processes that are limited in their efficiency and waveleng.h *** motivates the exploration of physical mechanisms for entang.ed photon g.neration,with a special interest in mechanisms that can be heralded,preferably at telecommunications *** we present a mechanism for the g.neration of heralded entang.ed photons from Rydberg.atom cavity quantum electrodynamics(cavity QED).We propose a scheme to demonstrate the mechanism and quantify its expected *** heralding.of the process enables non-destructive detection of the photon *** entang.ed photons are produced by exciting.a rubidium atom to a Rydberg.state,from where the atom decays via two-photon emission(TPE).A Rydberg.blockade helps to excite a sing.e Rydberg.excitation while the input lig.t field is more efficiently collectively absorbed by all the *** TPE rate is sig.ificantly enhanced by a desig.ed photonic cavity,whose many resonances also translate into hig.-dimensional *** resulting.hig.-dimensionally entang.ed photons are entang.ed in more than one deg.ee of freedom:in all of their spectral components,in addition to the polarization—forming.a hyperentang.ed state,which is particularly interesting.in hig. information capacity quantum *** characterize the photon comb states by analyzing.the Hong.Ou-Mandel interference and propose proof-of-concept experiments.

关键词： Rydberg quantum proof

Efficient, Season-Independent Seed g.rmination in Black Cohosh (<i&g.;Actaea racemosa</i&g.;L.)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2013年第5期4卷 77-83页

作者： Bhavneet Kaur Joe-Ann McCoy Edward eisenstein Institute for Bioscience and Biotechnolog. Research Fischell Department of Bioengineering University of Maryland Rockville USA Plant Protection DuPont Agricultural Biotechnology Wilmington USA The North Carolina Arboretum University of North Carolina Affiliate Campus Asheville USA.

Seed g.rmination in black cohosh was systematically examined in eig.teen populations including.15 USDA accessions with an effective protocol for the consistent, season independent g.rmination of this valuable alternative specialty crop. Two in vitro approaches were investig.ted for breaking.the complex double dormancy of black cohosh seeds for yearround g.rmination of plants for increased cultivation and laboratory studies. The first approach was a two-step alternating.temperature stratification in which surface sterilized seeds were incubated in darkness at 25?C for two weeks followed by incubation at alternating.temperatures of 20?C and 8?C for 12-hour periods with a 16-hour photoperiod for 12 months. The second was a three-step-approach that involved initial stratification of seeds in darkness at 25?C for two weeks, followed by incubation at 4?C in darkness for 3 -4 months and then cultivation at 25?C with a 16-hour photoperiod to g.nerate seedling.. Althoug. both approaches broke double dormancy for black cohosh seed g.rmination, the three-step-stratification technique yielded hig.er percentag. seed g.rmination in less time when compared to the two-step scheme, including.for seeds stored over two years. Additional factors of critical importance for efficient g.rmination included the selection of healthy and viable seeds, as well as thoroug. but non-excessive surface sterilization to control bacterial and fung.l contamination. The in vitro approach for black cohosh g.rmination allowed year-round cultivation and culture of a number of different g.notypic accessions to enable laboratory based studies on cell culture and transformation approaches to aid in deciphering.g.ne-metabolite relationships in this important medicinal plant.

关键词： Actaea racemosa Seed g.rmination Morphophysiolog.cal Dormancy Stratification Radicle

新的分子学技术在微生物流行病学和传染病诊断中的应用

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国外医学（流行病学．传染病学分册） 1990年第4期17卷 161-164页

作者： eisenstein BI 杨能宇

新的分子学技术的出现使传染病的快速诊断更敏感、更特异,并提高了微生物流行病学研究的能力。本文对新的分子学技术包括表型和基因型、多位点酶电泳、质粒图谱分析法及聚合酶链反应作了扼要介绍。

关键词：分子学技术传染病微生物学检验

在线全文

学校读者我要写书评

暂无评论

2024最值得关注的七大技术

宁波经济（财经视点） 2024年第4期 32-34页

作者： Michael eisenstein 不详

从蛋白质工程到3D打印再到深度伪造(deepfake),《自然》近期细数了今年值得关注的七大技术。面向蛋白质设计的深度学习20年前,华盛顿大学的David Baker和同事取得了一个重要突破:他们用计算工具从头设计了一种全新的蛋白质。“Top7”能... 详细信息

从蛋白质工程到3D打印再到深度伪造(deepfake),《自然》近期细数了今年值得关注的七大技术。面向蛋白质设计的深度学习20年前,华盛顿大学的David Baker和同事取得了一个重要突破:他们用计算工具从头设计了一种全新的蛋白质。“Top7”能按预期折叠,但它是惰性的:没有实际的生物学功能。如今,从头开始(de novo)的蛋白质设计已经成熟,成了生产定制酶和其他蛋白质的实用工具。“这个技术现在很强大,”与Baker团队合作设计基于蛋白的疫苗和药物递送载体的华盛顿大学生物化学家Neil King.,“一年半前还是不可能的事,现在说做就做。”

关键词： 3D打印生物化学家深度学习蛋白质工程华盛顿大学计算工具团队合作

Ecolog.cal and Chemotypic Analysis for Improved g.owth and Manag.ment of Naturally Occurring.Black Cohosh (<i&g.;Actaea racemosa</i&g.;L.) Populations in Western Maryland

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2015年第19期6卷 3272-3281页

作者： Amanda Vickers Sunshine L. Brosi James Howell Bhavneet Kaur David Puthoff Edward eisenstein Frostburg.State University Frostburg USA US Botanical Safety Lab Candler USA Alleg.ny Colleg. of Maryland Cumberland USA Institute for Bioscience and Biotechnolog. Research Rockville USA Sustainable Ag.icultural Systems Laboratory Beltsville Agricultural Research Center USDA-ARSBeltsville USA Fischell Department of Bioeng.neering University of Maryland Rockville USA

Black cohosh (Actaea racemosa L.) is a perennial herb native to deciduous woodlands in eastern North America with an extensive history of traditional use, most commonly for rheumatoid arthritis and female reproductive issues. Modern clinical research has maintained this herb’s relevance into the 21st century with a majority of authentic black cohosh raw material still harvested from naturally occurring.populations in Appalachian woodlands for use in botanical supplements. Increased use and interest in black cohosh have led to increased wild harvesting. reports of adulteration, and stress on this important natural resource. In an effort to study this sig.ificant medicinal plant as part of an ecosystem, and to understand factors that would contribute to the more effective g.owth and maintenance of black cohosh, key chemical, physiolog.cal, and ecolog.cal aspects of two occurring.populations in western Maryland were surveyed. Rhizomes were harvested from six populations of naturally occurring.black cohosh in two state forests located in the Alleg.eny Plateau and Ridg. and Valley physiog.og.aphic provinces of Maryland. The concentrations of five medicinal compounds found in black cohosh extracts, actein, 23-epi-26-deoxyactein, cafeic acid, ferulicacid, and N-methylserotonin, were compared with plant reproductive status as well as accompanying.overstory and under story species, soil moisture, and soil pH at each site. Compound levels showed a complex dependence on physiog.aphy but were independent of reproductive state. The finding. provide clues to g.ide efforts at effective g.owth and manag.ment of wild populations of black cohosh and other threatened medicinal plants.

关键词： Actaea racemosa Rhizome Natural Products Physiog.aphic Province Reproductive State

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

把物理技术引入中学课程

物理通报 1995年第7期 28-31页

作者： B.eisenstein S.Millman g.Pallrand 拉杰斯大学数学科学和计算机教育中心贝尔实验室拉杰斯教育学研究生院科学教育学家名誉物理指导拉杰斯中心的高级顾问教授

在本栏目中已经发表过几篇论文,分别介绍了德国、法国等国中学物理教育现状,那么英,美等国情况如何呢。本文介绍美国中学物理教改的状况,其突出特点的是对中学教育引入高技术。现摘译出来,介绍给大家。

关键词：中学课程物理学物理技术磁性材料石榴石传导电子

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

康林松:电动化的真正信徒

经营者(汽车商业评论) 2021年第11期 123-125页

作者：朱琳 Paul A.eisenstein ABR

这位首席执行官明确表示,奔驰正在加大赌注几年前,梅赛德斯还把主要注意力放在柴油车上,但在一场令人尴尬的排放丑闻之后,以及面对日益严格的全球排放标准,它改变了方向。梅赛德斯-奔驰的目标是,到2025年,让插电式混合动力和纯电动车型...

这位首席执行官明确表示,奔驰正在加大赌注几年前,梅赛德斯还把主要注意力放在柴油车上,但在一场令人尴尬的排放丑闻之后,以及面对日益严格的全球排放标准,它改变了方向。梅赛德斯-奔驰的目标是,到2025年,让插电式混合动力和纯电动车型占到公司全球销量的50%。

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

重现宇宙的远古声波

中国国家天文 2016年第4期10卷 104-109页

作者： Daniel eisenstein 吴蕴豪

天文学家正在绘制迄今最大的星系分布图，目的是寻找宇宙最原初的声波。

关键词：声波宇宙新墨西哥州分布图数字化天文学年代星系

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

微生物流行病学和传染病诊断的新分子技术

微生物学免疫学进展 1991年第2期19卷 17-21页

作者： Barry I.eisenstein 杨亮

新兴的方法学改变了快速诊断传染病的方法,并能从事微生物流行病学的研究。这两方面的关键因素是要能够鉴定微生物和确定与疾病发生或爆发相关的病原。用任何一种方法鉴定微生物都需要有足够的关于此微生物独特性质的知识,以便将其与... 详细信息

新兴的方法学改变了快速诊断传染病的方法,并能从事微生物流行病学的研究。这两方面的关键因素是要能够鉴定微生物和确定与疾病发生或爆发相关的病原。用任何一种方法鉴定微生物都需要有足够的关于此微生物独特性质的知识,以便将其与大量非病原菌或非流行菌株区别开来。例如,尽管大肠埃希氏菌中有一些菌株能够引起种种严重的疾病,其实此种细菌通常是胃肠道的一种正常居住菌。

关键词：克隆微生物流行病传染病诊断