检索结果-南通市图书馆

中华高血压杂志 2017年第10期25卷 998-998页

作者： Juraschek SP daya n Appel LJ Miller ER Windham BG Pompeii L Griswold ME Kucharska-newton A Selvin E 陈云叶鹏

每年有1／3老年人晕倒。直立性低血压（orthostatic hypotension，OH）被认为是晕倒的重要危险因素之一，但先前对此研究的结论并不一致。

关键词：直立性低血压晕倒风险中年危险因素老年人

Conditions for advantageous quantum Bitcoin mining

在线全文

学校读者我要写书评

暂无评论

Blockchain(Research and Applications) 2023年第3期4卷 52-63页

作者： Robert R.nerem daya R.Gaur Institute for Quantum Science and Technology University of CalgaryAlbertaT2N 1N4Canada Department of Mathematics University of California San DiegoCalifornia92093United States Department of Mathematics and Computer Science University of LethbridgeAlbertaT1K 3M4Canada

Our aim is to determine the conditions for quantum computing technology to give rise to the security risks associated with quantum Bitcoin ***,we determine the speed and energy efficiency a quantum computer needs to offer an advantage over classical *** analyze the setting in which the Bitcoin network is entirely classical except for a single quantum miner with a small hash rate compared to the *** develop a closed-form approximation for the probability that the quantum miner successfully mines a block,with this probability dependent on the number of Grover iterations the quantum miner applies before making a ***,we show that for a quantum miner that is“peaceful”,this success probability is maximized if the quantum miner applies Grover iterations for 16 min before measuring,which is surprising,as the network mines blocks every 10 min on *** this optimal mining procedure,we show that the quantum miner outperforms a classical computer in efficiency(cost per block)if the condition Qn,C is the cost of a classical hash,r is the quantum miner's speed in Grover iterations per second,and b is a factor that attains its maximum if the quantum miner uses our optimal mining *** condition lays the foundation for determining when quantum mining and the known security risks associated with it will arise.

关键词： Quantum algorithms Quantum mining Grover search Bitcoin Quantum attacks

Spatio-temporal distribution of earthquake occurrence in Eastern Himalaya and vicinity(26°n-31°n and 87°E-98°E)based on b-value and fractal dimension

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

Applied Geophysics 2022年第3期19卷 458-469,472页

作者： Ram Krishna Tiwari Harihar Paudyal daya Shanker Central Department of Physics Tribhuvan UniversityKirtipurKathmanduNepal Birendra Multiple Campus Tribhuvan UniversityBharatpurChitwanNepal Department of Earthquake Engineering Indian Institute of Technology RoorkeeRoorkeeUttarakhandIndia

This study investigates the spatial and temporal variation of fractal dimension and b-value for the eastern part of the Himalaya and adjoining area(26°n–31°n and 87°E–98°E).The analysis is carried out on the earthquake dataset of 1373 events(Mc=4.0)by sliding window technique for the period 1964 to *** region is divided into three sub regions A(87°E–92°E),B(92°E–94°E)and C(94°E–98°E).The b-value computed for the region A comprising eastern nepal is smaller compared to other two regions which infers the possible high stress and asperities in the *** spatial fractal dimension(Dc>1.5)and low temporal fractal dimension(Dtnsion may indicate that fractures generating earthquakes are approaching a 2D structure and low temporal fractal dimension implies high clustering of earthquake’s *** b value shows a weak negative correlation with Dc for regions A and C while a weak positive correlation is observed for the region *** on b-value and fractal dimension,this study explains the frequency of earthquakes and heterogeneity of the seismogenic structure in this part of the Himalaya.

关键词： Eastern Himalaya fault b-value fractal dimension earthquake clustering

Seismicity of Tehri Area of the Himalayan Region, India

在线全文

学校读者我要写书评

暂无评论

International Journal of Geosciences 2024年第11期15卷 911-926页

作者： Ashok Anand nazeel Sabah daya Shanker Department of Civil Engineering Indian Institute of Technology Roorkee India Department of Earthquake Engineering Indian Institute of Technology Roorkee India

A database for the seismicity of the Tehri region (29.5˚n - 31.5˚n and 77.5˚E - 79.5˚E) from november 1, 1853, to March 31, 1989, has been prepared using a Compatible Personal Computer System. The seismicity database is complete for events with mb ≥ 4.5 only since 1963. It is inferred that the general seismicity of the area is considerably low, which is associated with four main tectonic features identified based on the spatial distribution of events in the area. Earthquakes in the Tehri area is of shallow focus, and maximum seismic activity is confined in the region beyond 60 km east and northwest of Tehri. The cumulative number of Events as a Function of Time (CnET) for the period from 1963 to 1988 has indicated that precursory swarms do not precede the medium-sized earthquakes of the Tehri area. However, the CnET curves for total events and those with mb ≥ 4.6 have indicated a sharp 2-fold seismicity rate increase from 1986 compared to the preceding period. The October 20, 1991 (IST) earthquake of mb = 6.5 of Uttarkashi is believed to be associated with this seismicity rate change. The continuous increasing trend of the CnET curve before 1986 has been attributed to the detection changes.

关键词： Himalayan Seismicity b-Value Earthquake Precursors Seismicity Rate

平板运动试验后心率恢复和恢复期室性期前收缩的临床意义

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

临床心血管病杂志 2010年第8期26卷 574-577页

作者：李志明叶运新杨达雅申源生胡承恒惠州市中心人民医院心内科广东惠州516001 中山大学附属第一医院心内科

目的:观察平板运动试验后患者心率恢复情况及恢复期室性期前收缩的数量,探讨其在心力衰竭(心衰)和冠心病方面可能的临床意义。方法:入选完成平板运动试验的342例住院患者,根据平板结果和氨基末端B型利钠肽前体水平分别分为阳性组(184例... 详细信息

目的:观察平板运动试验后患者心率恢复情况及恢复期室性期前收缩的数量,探讨其在心力衰竭(心衰)和冠心病方面可能的临床意义。方法:入选完成平板运动试验的342例住院患者,根据平板结果和氨基末端B型利钠肽前体水平分别分为阳性组(184例)和阴性对照组(158例),心衰组(48例)和正常对照组(294例)。比较各组患者在试验后0s、30s、1min、2min、4min、6min、10min的心率,计算1min、2min、4min、6min、10min5个时间点的心率恢复速率值,并计算恢复期10min内室性期前收缩总数。结果:阳性组和心衰组患者的心率恢复速率均低于各自的对照组。在试验后2min内,心率恢复速率曲线分离较大,差异具有统计学意义。2min后各组差异减小,无统计学意义。阳性组、心衰组运动后室性期前收缩的数量均比相应的对照组增多(37.6±3.7:19.2±2.4;32.3±3.1:11.8±1.9),均Pn内心率恢复的减慢和恢复期室性期前收缩的增多可能是一个预测心血管事件简单而实用指标。

关键词：心律失常心率恢复室性期前收缩心力衰竭冠心病

Comparable Study of Xylanase Production from Aspergillus niger via Solid State Culture

在线全文

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2012年第12期6卷 1106-1113页

作者： norazhna I Pushpahvalli B Ku Halim K.H norakma M.n Faculty of Engineering Universiti Selangor Bestari Jaya 45600 Malaysia Faculty of Science and Biotechnology Universiti Selangor Bestari daya 45600 Malaysia Faculty of Chemical Engineering Universiti Teknologi Mara Selangor 40450 Malaysia

With the high availability of agricultural wastes in Malaysia, green energy is practical to be conducted. Thus, a research on the modification of the physical conditions of the solid state culture system, specifically different initial moisture content, fermentation temperature, inoculums size and different percentage of carbon and nitrogen sources were conducted to compare the usage of two different lignocellulosic materials which were oil palm frond and banana petiole respectively. After using a conventional method （one factor at a time）, the optimum fermentation conditions would be a combination of 70% initial moisture content （v/w）, at 28 ~C fermentation temperature with supplementation of 1% sucrose （w/w） and 1% peptone using 1 mL of inoculum in order to achieve highest xylanase production which was 1,711.87 U/mL and 1,579.60 U/mL for oil palm frond and banana petiole respectively. It was suggested that oil palm frond showed higher xylanase production compared to banana petiole.

关键词： Xylanase solid state culture Aspergillus niger oil palm frond banana petiole.

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

斜带石斑鱼与赤点石斑鱼的核型研究

湛江海洋大学学报 2004年第3期24卷 4-8页

作者：王云新王宏东张海发刘付永忠广东省大亚湾水产试验中心广东惠州516081

采用PHA体内注射肾细胞直接制片法研究斜带石斑鱼和赤点石斑鱼的核型。结果表明 ,斜带石斑鱼的核型为 2n =4 8,2sm +46t ,nF =5 0 ;赤点石斑鱼的核型为 2n =4 8,5st+43t ,nF =4 8。两种鱼的 2n数相同 ,它们的核型特点符合典型的高位类... 详细信息

采用PHA体内注射肾细胞直接制片法研究斜带石斑鱼和赤点石斑鱼的核型。结果表明 ,斜带石斑鱼的核型为 2n =4 8,2sm +46t ,nF =5 0 ;赤点石斑鱼的核型为 2n =4 8,5st+43t ,nF =4 8。两种鱼的 2n数相同 ,它们的核型特点符合典型的高位类群鱼类核型特征。

关键词：海水鱼类核型斜带石斑鱼赤点石斑鱼 PHA注射法

在线全文

学校读者我要写书评

暂无评论

医学生物化学实验线上教学资源的建设与应用

生命的化学 2024年第12期44卷 2353-2360页

作者：谢彩凤涂硕罗达亚熊向阳杨晓红朱伟锋黄春洪胡晓鹃南昌大学江西医学部基础医学院生物化学与分子生物学教研室南昌310006 南昌大学玛丽女王学院南昌330031

医学生物化学实验是医学生理解和应用生物化学理论知识、提高动手能力及培养科研创新思维的重要专业课程。为了延伸实验课程深度和广度进而提高课程育人成效,培养学生创新思辨能力,本教学团队构建了含实验慕课、虚拟仿真实验平台、直播... 详细信息

医学生物化学实验是医学生理解和应用生物化学理论知识、提高动手能力及培养科研创新思维的重要专业课程。为了延伸实验课程深度和广度进而提高课程育人成效,培养学生创新思辨能力,本教学团队构建了含实验慕课、虚拟仿真实验平台、直播授课及线上生物软件学习的“四位一体”线上教学资源,进而将该线上教学资源与线下实验课程项目内容进行有机融合,有效地提升了学生对于实验项目的掌握度和满意度。教学实践发现,单纯的线上实验课程无法满足学生实际动手操作的需求,存在学生掌握度较低,且学生成绩区分度较差等问题。而通过构建完善的线上实验课程内容并有机整合线下实验项目,打造线上线下混合式综合创新实验课程体系可以较好地突破时间空间的限制,提升课程的广度和深度,增加课程的抗压度。本文的相关改革内容可供借鉴及参考。

关键词：医学生物化学实验课程线上教学

Improved measurement of the reactor antineutrino flux and spectrum at daya Bay

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2017年第1期41卷 11-46页

作者：安丰鹏 A.B.Balantekin H.R.Band M.Bishai S.Blyth 曹德文曹国富曹俊岑吴镕陳日朗常劲帆張立楚张昀陈和生陈泉佑陈少敏陈义学陈羽程佳樺程捷程雅苹成兆侃 J.J.Cherwinka 朱明中 A.Chukanov J.P.Cummings J.de Arcos 邓子艳丁雪峰丁雅韵 M.V.Diwan M.Dolgareva J.Dove D.A.Dwyer W.R.Edwards R.Gill M.Gonchar 龚光华宫辉 M.Grassi 顾文强关梦云郭磊郭如盼郭新恒郭子溢 R.W.Hackenburg 韩然 S.Hans 何苗 K.M.Heeger 衡月昆 A.Higuera Y.K.Hor 熊怡胡貝禎胡涛胡维黄恩泉黄翰雄黄性涛 P.Huber 霍文驹 G.Hussain D.E.Jaffe P.Jaffke 任國綸 S.Jetter 季向盼季筱璐焦健斌 R.A.Johnson D.Jones J.Joshi 康丽 S.H.Kettell S.Kohn M.Kramer 關健强郭文伟郭天能 T.J.Langford K.Lau L.Lebanowski J.Lee 李曉菁雷瑞庭 R.Leitner 李超李登杰李飞李高嵩李秋菊黎山峰 S.C.Li 李卫东李小男李玉峰李志兵梁昊林政儒林贵林林盛鑫林士凱林禹丞凌家杰 J.M.Link L.Littenberg B.R.Littlejohn 刘大为刘江来刘金昌 C.W.Loh 陆昌国路浩奇陆稼书陆锦标吕志鹏马秋梅马晓妍马续波马宇倩 Y.Malyshkin D.A.Martinez Caicedo K.T.McDonald R.D.McKeown I.Mitchell M.Mooney Y.nakajima J.napolitano D.naumov E.naumova 倪浩然宁哲 J.P.Ochoa-Ricoux A.Olshevskiy 潘孝儒 J.Park S.Patton V.Pec 彭仁杰 L.Pinsky 潘振声齐法制祁鸣钱鑫 n.Raper 任杰 R.Rosero B.Roskovec 阮锡超 H.Steiner 孙功星孙吉良唐炜 D.Taychenachev K.TVeskov K.V.Tsang C.E.Tull n.Viaux B.Viren V.Vorobei 王正祥王萌王乃彦王瑞光王为王玺王贻芳王喆王铮王志民魏瀚宇温良剑 K.Whisnant C.G.White L.Whitehead T.Wise 黄显诺黄振辉 E.Worcester 吳珈豪吴群吴文杰夏冬梅夏经凯邢志忠徐建一徐吉磊徐晔薛涛杨长根杨海波杨雷阳马生杨梦婷叶梅 Z.Ye 叶铭芳杨炳麟于泽源曾珊占亮张超张宏浩张家文张清民张玄同张一鸣张一心张玉美张志坚张智勇张子平赵洁赵庆旺赵豫斌钟玮丽周莉 n.Zhou 庄红林邹佳恒 Institute of Modern Physics East China University of Science and Technology University of Wisconsin Department of Physics Yale University Brookhaven national Laboratory Department of Physics National Taiwan University national United University nanjing University Institute of High Energy Physics Chinese University of Hong Kong Institute of Physics National Chiao-Tung University Shandong University Department of Engineering Physics Tsinghua University north China Electric Power University Shenzhen University Sun Yat-Sen (Zhongshan) University Joint Institute for nuclear Research Siena College Department of Physics Illinois Institute of Technology Department of Physics University of Illinois at Urbana-Champaign Lawrence Berkeley national Laboratory Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Beijing normal University Department of Chemistry and Chemical Technology Bronx Community College Department of Physics University of Houston Center for neutrino Physics Virginia Tech China Institute of Atomic Energy University of Science and Technology of China School of Physics Nankai University Department of Physics University of Cincinnati Department of Physics College of Science and Technology Temple University Dongguan University of Technology Department of Physics University of California Department of Physics The University of Hong Kong Charles University Faculty of Mathematics and Physics Joseph Henry Laboratories Princeton University Department of nuclear Science and Technology School of Energy and Power Engineering Xi’an Jiaotong University Instituto de F'?sica Pontificia Universidad Católica de Chile California Institute of Technology College of William and Mary Department of Physics Applied Physics and Astronomy Rensselaer Polytechnic Institute China General nuclear Power Group College of Electronic Science and Engineering National University of Defense Technology Iowa State University Chongqing University

A new measurement of the reactor antineutrino flux and energy spectrum by the daya Bay reactor neutrino experiment is reported. The antineutrinos were generated by six 2.9 GWth nuclear reactors and detected by eight antineutrino detectors deployed in two near（560 m and 600 m flux-weighted baselines） and one far（1640 m flux-weighted baseline） underground experimental halls. With 621 days of data, more than 1.2 million inverse beta decay（IBD） candidates were detected. The IBD yield in the eight detectors was measured, and the ratio of measured to predicted flux was found to be 0.946±0.020（0.992±0.021） for the Huber＋Mueller（ILL＋Vogel） model. A 2.9σ deviation was found in the measured IBD positron energy spectrum compared to the predictions. In particular, an excess of events in the region of 4–6 MeV was found in the measured spectrum, with a local significance of 4.4σ. A reactor antineutrino spectrum weighted by the IBD cross section is extracted for model-independent predictions.

关键词： antineutrino flux energy spectrum reactor daya Bay

Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at daya Bay

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2021年第5期45卷 190-201页

作者： F.P.An A.B.Balantekin H.R.Band M.Bishai S.Blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettell S.Kohn M.Kramer T.J.Langford J.Lee J.H.C.Lee R.T.Lei R.Leitner J.K.C.Leung F.Li J.J.Li Q.J.Li S.Li S.C.Li W.D.Li X.n.Li X.Q.Li Y.F.Li Z.B.Li H.Liang C.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link L.Littenberg B.R.Littlejohn J.C.Liu J.L.Liu C.Lu H.Q.Lu J.S.Lu K.B.Luk X.B.Ma X.Y.Ma Y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown Y.Meng J.napolitano D.naumov E.naumova J.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian n.Raper J.Ren C.Morales Reveco R.Rosero B.Roskovec X.C.Ruan H.Steiner J.L.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull B.Viren V.Vorobel C.H.Wang J.Wang M.Wang n.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing J.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh B.L.Young H.Z.Yu Z.Y.Yu B.B.Yue S.Zeng Y.Zeng L.Zhan C.Zhang F.Y.Zhang H.H.Zhang J.W.Zhang Q.M.Zhang X.T.Zhang Y.M.Zhang Y.X.Zhang Y.Y.Zhang Z.J.Zhang Z.P.Zhang Z.Y.Zhang J.Zhao L.Zhou H.L.Zhuang J.H.Zou Instiute of Modern Physics East China University of Science and TechnologyShanghai 200237 University of Wisconsin MadisonWisconsin 53706 Wright Laboratory and Department of Physics Yale UniversityNew HavenConnecticut 06520 Brookhaven national Laboratory UptonNew York 11973 Department of Physics National Taiwan UniversityTaipei Institute of High Energy Physics Beijing 100049 national United University Miao-Li Department of Engineering Physics Tsinghua UniversityBejing 100084 Shenzhen University Shenzhen 518060 Sun Yat-Sen(Zhongshan)University Guangzhou north China Electric Power University Bejjing 102206 Chinese University of Hong Kong Hong Kong 999077 Siena College LoudonvilleNew York 12211 Department of Physics and Astronomy University of CaliforniaIrvineCaliformia 92697 University of Science and Technology of China Hefei 230026 Charles University Faculty of Mathematics and PhysicsPrague Department of Physics University of llinois at Urbana-ChampaignUrbanaIlinois 61801 Lawrence Berkeley national Laboratory BerkeleyCalifornia 94720 Department of Physics Illinois Institute of TechnologyChicagoIllinois 60616 Joint Institute for nuclear Research DubnaMoscow Region Beijing normal University Beijing 100875 Department of nuclear Science and Technology School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an 710049 Department of Physics University of HoustonHoustonTexas 77204 China Institute of Atomic Energy Beijing 102413 Shandong University Jinan 250100 Guangxi University Nanning 530004 Center for neutrino Physics Virginia TechBlacksburgVirginia 24061 Institute of Physics National Chiao-Tung UniversityHsinchu Department of Physics University of CincinnatiCincinnatiOhio 45221 Department of Physies Collge of Science and TechnologyTemple UniversityPhiladelphiaPennsylvania 19122 Dongguan University of Technology Dongguan 523808 Department of Physics University of CaliforniaBerkeleyCalifornia 94720 Department of Physics The University of Hong KongPokfulamHong Kong 999077 School

The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars *** the daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW *** used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino *** detected electron-antineutrino candidates were consistent with the expected background rates for all the three time *** monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w *** the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows.

关键词： grav itational waves electron-antineutrinos fluence upper limit