检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

我国河南与北京腹泻患儿中的星状病毒感染

病毒学报 2000年第2期16卷 123-126页

作者：方肇寅章菁赵章华马莉李永华杨辉 S.Monroe r.glass 中国预防医学科学院病毒学研究所北京100052 北京友谊医院北京100050 河南省中医研究院郑州450004 美国疾病控制和预防中心

人星状病毒 (HAstV)是rNA病毒的新家族 ,从我国河南和北京两地区的急性腹泻患儿便样中鉴定了 7株星状病毒 ,经电镜观察病毒颗粒直径约为 2 8nm ,表面呈五角或六角星状形态 ,用rT PCr检定为阳性 ,比较PCr扩增产物的核苷酸序列构建的序列... 详细信息

人星状病毒 (HAstV)是rNA病毒的新家族 ,从我国河南和北京两地区的急性腹泻患儿便样中鉴定了 7株星状病毒 ,经电镜观察病毒颗粒直径约为 2 8nm ,表面呈五角或六角星状形态 ,用rT PCr检定为阳性 ,比较PCr扩增产物的核苷酸序列构建的序列同源性树表明 ,1 990年在河南流行的星状病毒主要为HAstV 1 ,另有一株HAstV 5,1 996年北京流行株为HAstV 5。对HAstV患儿的临床症状进行了讨论。

关键词：急性胃肠炎星状病毒 rT-PCr 序列分析流行病学

在线全文

学校读者我要写书评

暂无评论

在我国腹泻患儿中发现诺瓦克样病霉感染

病毒学报 1995年第3期11卷 215-219页

作者：方肇寅温乐英晋圣瑾赵章华 C.Moe H.Yoshikura r.glass 中国预防医学科学院病毒学研究所河南省中医研究院美国疾病控制和预防中心日本京东大学医学院

诺瓦克病毒是引起无菌性急性胃肠炎爆发的重要病原。１９９０年１０月至１９９１年１月从河南省急性腹泻门诊患儿便样中发现了诺瓦克样病毒。经电镜观察，病毒直径约为２８ｎｍ，病毒壳似由有结构的亚单位组成，进一步用诺瓦克病毒特异... 详细信息

诺瓦克病毒是引起无菌性急性胃肠炎爆发的重要病原。１９９０年１０月至１９９１年１月从河南省急性腹泻门诊患儿便样中发现了诺瓦克样病毒。经电镜观察，病毒直径约为２８ｎｍ，病毒壳似由有结构的亚单位组成，进一步用诺瓦克病毒特异的寡核苷酸引物做逆转录一聚合酶链式反应（ＲＴ－ＰＣＲ），检定为阳性。由ＰＣＲ产物测得的核苷酸序列与诺瓦克病毒原型株相应序列比较，同源性为７２％。以上结果证实，在我国腹泻病人中有诺瓦克样病毒感染。这对我国病毒性胃肠炎流行的防治研究具有重要意义。

关键词：腹泻儿童急性胃肠炎诺瓦克病毒

Tensorial tomographic Fourier ptychography with applications to muscle tissue imaging

在线全文

学校读者我要写书评

暂无评论

Advanced Photonics 2024年第2期6卷 50-60页

作者： Shiqi Xu Xi Yang Paul ritter Xiang Dai Kyung Chul Lee Lucas Kreiss Kevin C.Zhou Kanghyun Kim Amey Chaware Jadee Neff Carolyn glass Seung Ah Lee Oliver Friedrich roarke Horstmeyer Duke University DurhamNorth CarolinaUnited States Friedrich-Alexander University ErlangenGermany UC San Diego La JollaCaliforniaUnited States Yonsei University SeoulRepublic of Korea UC Berkeley BerkeleyCaliforniaUnited States Duke University Medical Center DurhamNorth CarolinaUnited States

We report tensorial tomographic Fourier ptychography(T^(2)oFu),a nonscanning label-free tomographic microscopy method for simultaneous imaging of quantitative phase and anisotropic specimen information in *** upon Fourier ptychography,a quantitative phase imaging technique,T^(2)oFu additionally highlights the vectorial nature of *** imaging setup consists of a standard microscope equipped with an LED matrix,a polarization generator,and a polarization-sensitive *** tensors of anisotropic samples are computationally recovered from polarized intensity measurements across three *** demonstrate T^(2)oFu’s efficiency through volumetric reconstructions of refractive index,birefringence,and orientation for various validation samples,as well as tissue samples from muscle fibers and diseased heart *** reconstructions of healthy muscle fibers reveal their 3D fine-filament structures with consistent ***,we demonstrate reconstructions of a heart tissue sample that carries important polarization information for detecting cardiac amyloidosis.

关键词： computational imaging three-dimensional imaging phase retrieval microscopy polarization-sensitive imaging labelfree imaging

Analysis and Optimization of Operational and Pollutant Attributes of Diesel Engine with CNT-Infused Orange Peel Biodiesel-Diesel Blend Fuel

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

Journal of Thermal Science 2024年第2期33卷 761-778页

作者： ranjeet rAI r.r.SAHOO Mechanical Engineering Department GLA UniversityMathura281406India Mechanical Engineering Department IIT(BHU)Varanasi221005India

The current study is performed to find sustainable solutions for the future of transportation and environmental *** conventional methods and experimental design table(L16 Orthogonal Array)techniques have been employed to examine and optimize a diesel-powered engine's operational and pollutant *** L16 Orthogonal Array is obtained through Taguchi's experimental design approach using Minitab 16 *** experimental design incorporated three control variables,namely engine speed,fuel type,and engine load,each with four *** operational parameters,namely brake thermal efficiency(BTE)and brake specific fuel consumption(BSFC),as well as the emission characteristics,including hydrocarbon(HC),carbon monoxide(CO),nitrogen oxide(NO),and smoke emissions,were acquired using the L16 orthogonal array(OA) and subsequently *** utilization of methodologies such as signal-to-noise(S/N) ratio and grey analysis was employed to determine the optimal operational state of the engine to achieve maximum performance while minimizing *** engine's ideal state of operation,in terms of BTE and BSFC,was determined to be at 75% engine load,1000 r/min engine speed,and using 10^(-4)(in vol) carbon nanotube incorporated 20% orange peel biodiesel(OPB20CNT100) blended fuel(A3-B1-C4).The study indicated that engine load significantly influenced BTE and BSFC,with 84.05% and 87.79% contribution factors,*** 25% engine load,1000 r/min,and OPB20CNT100 fuel(A1-B1-C4) CO,smoke,NO,and HC emissions were the *** load affects emissions the *** BSFC increased 3.10% and NO emissions 1.77%.BTE,CO,smoke,and HC emissions decreased by 1.9%,12.29%,47.05%,and 47.22%,respectively,at optimal operating conditions concerning diesel *** study shows that Taguchi-Grey's experimental design optimizes diesel engine operational and pollutant *** outcomes revealed that orange peel biodiesel infused with CNT can replace diesel fuel in a

关键词： Taguchi-Grey method OPB20CNT100 transesterification S/N ratio GrG HC CO and NO

Multidimensional images and aberrations in STEM

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2024年第9期33卷 68-74页

作者： Eric r.Hoglund Andrew r.Lupini Center for Nanophase Materials Sciences Oak Ridge National LaboratoryOak RidgeTN 37831United States

recent advances in scanning transmission electron microscopy(STEM)have led to increased development of multidimensional STEM imaging modalities and novel image reconstruction *** interest arises because the main electron lens in a modern transmission electron microscope usually has a diffraction-space information limit that is significantly better than the real-space resolution of the same *** state-of-affairs is sometimes shared by other scattering methods in modern physics and contributes to a broader excitement surrounding multidimensional techniques that scan a probe while recording diffraction-space images,such as ptychography and scanning nano-beam ***,the contrasting resolution in the two spaces raises the question as to what is limiting their effective ***,we examine this paradox by considering the effects of aberrations in both image and diffraction planes,and likewise separate the contributions of pre-and post-sample *** consideration provides insight into aberration-measurement techniques and might also indicate improvements for super-resolution techniques.

关键词： scanning transmission electron microscopy (STEM) aberrations

Kinematic analysis of flexible bipedal robotic systems

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 Mathematics and Mechanics(English Edition) 2024年第5期45卷 795-818页

作者： r.FAZEL A.M.SHAFEI S.r.NEKOO Department of Mechanical Engineering Shahid Bahonar University of KermanKerman ***Iran Departamento de Ingenieria de Sistemas y Automatica Escuela Técnica Superior de IngenieriaUniversidad de SevillaSeville 41092Spain

In spite of its intrinsic complexities,the passive gait of bipedal robots on a sloping ramp is a subject of interest for numerous *** distinguishes the present research from similar works is the consideration of flexibility in the constituent links of this type of robotic *** is not a far-fetched assumption because in the transient(impact)phase,due to the impulsive forces which are applied to the system,the likelihood of exciting the vibration modes increases ***,the human leg bones that are involved in walking are supported by viscoelastic muscles and ***,for achieving more exact results,it is essential to model the robot links with viscoelastic *** this end,the Gibbs-Appell formulation and Newton's kinematic impact law are used to derive the most general form of the system's dynamic equations in the swing and transient phases of *** most important issue in the passive walking motion of bipedal robots is the determination of the initial robot configuration with which the system could accomplish a periodic and stable gait solely under the effect of gravitational *** extremely unstable nature of the system studied in this paper and the vibrations caused by the impulsive forces induced by the impact of robot feet with the inclined surface are some of the very serious challenges encountered for achieving the above-mentioned *** overcome such challenges,an innovative method that uses a combination of the linearized equations of motion in the swing phase and the algebraic motion equations in the transition phase is presented in this paper to obtain an eigenvalue *** solving this problem,the suitable initial conditions that are necessary for the passive gait of this bipedal robot on a sloping surface are *** effects of the characteristic parameters of elastic links including the modulus of elasticity and the Kelvin-Voigt coefficient on the walking stability of this type of

关键词： bipedal robot flexible link swing phase transient phase eigenvalue problem Kelvin-Voigt coefficient

Holographic dark energy in non-conserved gravity theory

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第4期76卷 126-133页

作者： H r Fazlollahi Institute of Gravitation and Cosmology Peoples Friendship University of Russia(RUDN University)6 Miklukho-Maklaya StMoscow117198Russia

recently, reconsidering the rastall idea T_(μ;νν)^(v)=α_(,μ) through relativistic thermodynamics gives a new form for the scalar field α which led us to construct modern modified theory of gravity debugged ‘non-conserved gravity theory’ Fazlollahi 2023 Euro. Phys. J. C 83 923. This theory unlike other modified theories of gravity cannot directly explain the current acceleration expansion in the absence of the cosmological constant and or existence of other forms of dark energy. Hence, in this study we have reinvestigated holographic dark energy Ρ_(X)~H^(2) in the non-conserved theory of gravity. In this context, the density and pressure of dark energy depend on the non-conserved term and density of the dust matter field. As shown, due to non-conservation effects on large-scale structures, unlike the original holographic model, our model onsets an acceleration epoch for the current Universe satisfies observations. Moreover, the interaction and viscous scenarios are studied for this model.

关键词： non-conserved gravity covariant form of thermodynamics holographic dark energy

Investigating the impact of the universal function of the nuclear proximity potential in heavy-ion fusion cross sections

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第5期76卷 86-93页

作者： r Gharaei E Sarvari Department of Physics Sciences FacultyHakim Sabzevari UniversityPO Box 397SabzevarIran Department of Physics Faculty of ScienceFerdowsi University of MashhadPO Box 91775-1436MashhadIran Science Faculty Department of PhysicsTarbiat Modares UniversityTehranIran

The fusion barriers and cross sections of 15 colliding systems with 320≤Z_(1)Z_(2)≤1512 are investigated in detail to understand the influence of the universal function of proximity potential formalism in the heavy-ion fusion *** realize this goal,we select three versions of the phenomenological proximity potentials,including Prox.77,Zhang 2013,and Guo 2013,to calculate the nucleus-nucleus *** experimental fusion cross sections for the selected reactions are analyzed using the standard coupled-channel calculations,including couplings to the low-lying 2^(+)and 3^(-)states in the target and *** calculated results show that the universal functions of the Guo 2013 and Prox.77 models provide the lowest and highest fusion barriers,*** addition,it is found that the height of the fusion barriers is enhanced by increasing the mass number of the projectile from light to heavy *** highest sensitivity to the mass number of the projectile belongs to the results of Prox.77.A discussion is also presented on the influence of the universal function on the radial behavior of the interaction potential in the allowed region for overlapping *** results reveal that the best fit to the experimental data of the fusion cross sections for the reactions involving light and medium nuclei is obtained using the universal function of the Zhang 2013 *** the heavier systems,the results of the Guo 2013 model at sub-barrier energies provide a good description of the available data.

关键词： fusion reactions proximity-type potentials universal function coupled-channel calculations

在线全文

学校读者我要写书评

暂无评论

东京也将建成纽约式的高线公园

商业周刊（中文版） 2024年第9期 34-36页

作者： Mia glass 孟洁冰(译) 不详

东京即将建造类似于纽约高线公园的高架步行道,标志着这座城市对汽车至上地位的重视发生了初步转变。日本首都东京中心地带的一条主要高速道路计划把部分路段迁移至地下,这个项目将削弱东京高速道路(又称KK线)的重要地位。在讨论是否拆... 详细信息

东京即将建造类似于纽约高线公园的高架步行道,标志着这座城市对汽车至上地位的重视发生了初步转变。日本首都东京中心地带的一条主要高速道路计划把部分路段迁移至地下,这个项目将削弱东京高速道路(又称KK线)的重要地位。在讨论是否拆除KK线的事宜后,东京于2021年决定将这条长2公里的道路改造为空中步行道。该项目将于2029年部分开放,计划于2030年代或2040年代全部完工。

关键词：高速道路高线公园道路改造东京纽约步行