检索结果-南通市图书馆

Laser beam effect on the entanglement of elastic collisions in quantum plasma

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第8期76卷 147-155页

作者： Ramin Roozehdar Mogaddam Nasser Sepehri Javan hosein Mohammadzadeh Department of Physics Ferdowsi University of MashhadPO Box 1436MashhadIran Department of Physics University of Mohaghegh ArdabiliPO Box 179ArdabilIran

In the quantized field formalism, using Kramers-Henneberger unitary transformation as the semi-classical counterpart of Block-Nordsieck transformation, the dynamics of entanglement during the low energy scattering processes in bi-partite systems at the presence of a laser beam fields are studied. The stationary-state Schrodinger equation for the quantum scattering process is obtained for such systems. Then, using partial wave analysis, we introduce a new form of entanglement fidelity considering the effect of high-intensity laser beam fields. The effective potential of hot quantum plasma including plasmon and quantum screening effects is used to obtain the entanglement fidelity ratio as a function of the laser amplitude, and plasmon and Debye length parameters for the elastic electron-ion collisions. It is shown that the plasma free electrons oscillations under interaction with laser beam fields improve the correlations between charged particles and consequently lead to the increase in the system entanglement.

关键词： laser entanglement quantum plasma elastic collision plasmon fidelity

Experimental and Finite Element Analysis of Corroded High-Pressure Pipeline Repaired by Laminated Composite

在线全文

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2024年第8期140卷 1783-1806页

作者： Seyed Mohammad Reza Abtahi Saeid Ansari Sadrabadi Gholam hosein Rahimi Gaurav Singh Hamid Abyar Daniele Amato Luigi Federico Faculty of Mechanical Engineering Tarbiat Modares UniversityTehran***Iran A.Leon Linton Department of Mechanical Robotics and Industrial EngineeringLawrence Technological UniversitySouthfieldMI48075USA Department of Mechanical Engineering Faculty of EngineeringMeybod UniversityYazd***Iran Department of Industrial Engineering University of SalernoVia Giovanni PaoloⅡFiscianoItaly Italian Aerospace Research Center(C.I.R.A.) Via MaioriseCapuaCE81043Italy

Repairs of corroded high-pressure pipelines are essential for fluids transportation under high *** of the methods used in their repairs is the use of layered *** composite used must have the necessary ***,the experiments and analytical solutions presented in this paper are performed according to the relevant standards and codes,including ASME PCC-2,ASME B31.8S,ASME B31.4,ISO 24817 and ASME *** addition,the experimental tests are replicated numerically using the finite element *** the strain gauges at different distances from the defect location,can reduce the nonlinear effects,deformation,and fluctuations due to the high *** direct relationship between the depth of an axial defect and the stress concentration is observed at the inner side edges of the *** reparation reduces the non-linearities related to the sharp variation of the geometry and a more reliable numerical simulation could be performed.

关键词： High-pressure pipeline composite repair ASME PCC-2 ISO 24817

The potent osteo-inductive capacity of bioinspired brown seaweed-derived carbohydrate nanofibrous three-dimensional scaffolds

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

Marine Life Science & Technology 2024年第3期6卷 515-534页

作者： Zahra Dadashi Ouranj Saadi Hosseini Atefeh Alipour Shahin Homaeigohar Shahram Azari Leila Ghazizadeh Mohammadali Shokrgozar Sabu Thomas Saeed Irian hosein Shahsavarani Department of Cell and Molecular Biology Faculty of Biological SciencesKharazmi UniversityTehran 15719-14911Iran Laboratory of Regenerative Medicine and Biomedical Innovations National Cell Bank of IranPasteur Institute of IranTehran 13169-43551Iran Department of Nanobiotechnology Pasteur Institute of IranTehran 13169-43551Iran School of Science and Engineering University of DundeeDundee DD14HNUK School of Chemical Sciences Mahatma Gandhi UniversityKottayamKeralaIndia Department of Cell and Molecular Biology Faculty of Life Sciences and BiotechnologyShahid Beheshti UniversityTehran 19839-69411Iran Iranian Biological Resource Center Academic Center for EducationCulture and Research(ACECR)Tehran ***Iran

This study aimed to investigate the osteo-inductive capacity of a fucoidan polysaccharide network derived from brown algae on human adipose-derived stem cells(HA-MSCs)for bone *** physiochemical properties of the scaffold including surface morphology,surface chemistry,hydrophilicity,mechanical stiffness,and porosity were thoroughly *** in vitro and in vivo measurements implied a superior cell viability,proliferation,adhesion,and osteo-inductive performance of obtained scaffolds compared to using specific osteogenic induction medium with increased irregular growth of calcium crystallites,which mimic the structure of natural *** scaffold was highly biocompatible and suitable for cell *** examinations,such as quantification of mineralization,alkaline phosphatase,gene expression,and immunocytochemical staining of pre-osteocyte and bone markers confirmed that HAD-MSCs differentiate into osteoblasts,even without an osteogenic induction *** study provides evidence for the positive relationship and synergistic effects between the physical properties of the decellularized seaweed scaffold and the chemical composition of fucoidan in promoting the osteogenic differentiation of ***,the natural matrices derived from brown seaweed offers a sustainable,cost-effective,non-toxic bioinspired scaffold and holds promise for future clinical applications in orthopedics.

关键词： Bone tissue engineering Seaweed-derived scaffold Fucoidans HA-MSCs differentiation Osteoblasts

利用地理信息系统对中国地区羊弓形虫流行病学数据调查分析

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

中国预防兽医学报 2024年

作者：闫俊宇包梦楠刘丹吴琼宾晨李凌丹 hosein Salehian-Dehkordi 熊涛长江大学生命科学学院长江大学动物科学技术学院中国农业科学院北方农牧业技术创新中心(呼和浩特)

为了解我国地区羊弓形虫的流行情况，本研究利用知网、万方、维普、Web of Science、PubMed等数据库对1991年～2023年，近30年已收录的流行性病学文献中收集自我国22个省区的94 891份临床血清样品数据，并从地区、年份、经纬度、海拔、... 详细信息

为了解我国地区羊弓形虫的流行情况，本研究利用知网、万方、维普、Web of Science、PubMed等数据库对1991年～2023年，近30年已收录的流行性病学文献中收集自我国22个省区的94 891份临床血清样品数据，并从地区、年份、经纬度、海拔、感染率和聚集性分布情况对结果做了统计分析。结果显示，我国羊弓形虫血清抗体阳性率平均为10.37%(8869/94891,1991～2023)。其中阳性率最高的是华南地区平均阳性率41.18%，省份为广西，阳性样品21份。次之是西南地区平均阳性率30.49%，省份为云南、重庆、贵州羊弓形虫血清学阳性样品数量依次为1 830份(28.63%)、310份(45.06%)和919份(17.79%)。以南北方分界线秦岭淮河一线为分界线，秦岭淮河线以北的省份对羊弓形虫的流行病学调查较多，但感染率20%以下居多。秦岭淮河线以南只有一半省份有调查数据，但感染率20%以上居多。上述结果表明，我国大部分地区均存在羊弓形虫感染，呈地方性流行，华东、华南、西南地区应加强流行病学的监控与防治。利用中国海拔高度DEM 1 km(SRTM 90 m)高程图及经纬度数据，ArcGIS10.2软件标记海拔范围，海拔2 000 m以下的地区感染率较高，为10%～30%。提示低海拔、暖湿、高降雨区需要加强对弓形虫流行病学的监控与防治。通过General G和Moran’s I指数分析，羊弓形虫在空间上呈现高值聚类。提示羊弓形虫感染是显著性聚类，感染点之间具有极强关联性，存在聚集性并且是高值聚类。本研究结果表明利用GIS技术分析对中国地区所记载的羊感染弓形虫流行病的地理分布、适生区域、聚集情况，对羊弓形虫疾病预防、科学管控和决策作用有重要指导意义。

关键词：地理信息系统(GIS) 动物流行病学弓形虫羊

利用地理信息系统对我国羊弓形虫流行病学数据的调查与分析

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国预防兽医学报 2024年第2期46卷 206-213页

作者：闫俊宇包梦楠刘丹吴琼宾晨李凌丹 hosein Salehian-Dehkordi 熊涛长江大学动物科学技术学院湖北荆州434025 长江大学生命科学学院湖北荆州434025 中国农业科学院北方农牧业技术创新中心内蒙古呼和浩特010000

为了解我国羊弓形虫的流行情况,本研究对1991年~2023年近30年收录的羊弓形虫流行病学文献中我国22个省区的94 891份临床羊血清样品数据,采用Arc GIS10.2软件中的点密度和核密度分析法分析羊弓形虫在不同地区采样点的分布及聚集性;采用Ex... 详细信息

为了解我国羊弓形虫的流行情况,本研究对1991年~2023年近30年收录的羊弓形虫流行病学文献中我国22个省区的94 891份临床羊血清样品数据,采用Arc GIS10.2软件中的点密度和核密度分析法分析羊弓形虫在不同地区采样点的分布及聚集性;采用Excel 2010软件统计不同省份、地区及7个地理分区羊弓形虫的平均阳性率(以下均简称为阳性率);采用SPSS软件对上述地区的阳性率进行卡方检验;通过Arc GIS10.2软件做羊弓形虫阳性率分级(阳性率分为6个等级)的统计分析,以分析羊弓形虫在不同地区的分布状况。点密度和核密度结果显示,除12个地区外其他地区均有羊弓形虫调查数据的报告;羊弓形虫在青海、甘肃、河南、内蒙古、云南、新疆等地呈点的聚集性分布,在青海和甘肃省呈密集性分布。统计结果显示,我国羊弓形虫平均阳性率为10.37%(8869/94891),不同省份的阳性率在3.09%~30.49%;7个地理分区羊弓形虫的阳性率为14.4%~30.49%,其中西南地区阳性率最高为30.49%(3059/12245),主要包括重庆、云南、贵州,羊弓形虫阳性率依次为45.06%(310/688)、28.63%(1830/6392)和17.79%(919/5165)。西北地区的阳性率最低,为14.4%(3879/58038),主要包括陕西、甘肃、新疆、青海,羊弓形虫阳性率依次为29.82%(99/332)、17.12%(1353/7905)、6.03%(487/8071)、4.56%(1940/41730)。分级统计结果显示,秦岭淮河以北的省份对羊弓形虫的流行病学调查较多,且平均阳性率为20%以下居多,大多属于1级、2级地区,但其中华北地区平均阳性率为20.78%(737/4562),为3级地区。秦岭淮河以南只有一半省份有调查数据,主要集中在西南地区,平均阳性率为30.49%(3059/12245),为4级地区;其次是华东、华中地区,阳性率分别为18.7%(422/2329)和16.32%(1584/15474),均为2级地区,但其中的重庆市可达5级。上述结果表明,我国大部分地区均存在羊弓形虫且呈地方性流行,西南、华北地区应加强对羊弓形虫流行病学的监测与防治。利用ArcGIS10.2软件分析羊弓形虫的分布与海拔等气候条件的关系;采用全域莫兰指数(Moran’s I指数)、高低值聚类(General G指数)分析羊弓形虫分布地区的空间自相关性。通过ArcGIS10.2软件对弓形虫分布的冷热点分析,结果显示,海拔2 000 m以下地区的羊弓形虫阳性率均较高,为10%~30%,且低海拔、高温高湿和雨热地区羊弓形虫的阳性率均较高,提示上述地区需加强对羊弓形虫流行病学的监控与防治。弓形虫感染的空间自相关性分析结果表明我国羊弓形虫的分布地区之间存在关联性(Moran’s I指数>0)和聚集性(General G指数>0),且分布点之间具有极强关联性(General G指数中的Z>0)。冷热点分析显示,我国秦岭淮河两侧的湖南和安徽部分地区、贵州、河南及西北地区的青海和甘肃大部分地区均为热点地区。因此要在集中养殖区重点监测及防治羊弓形虫病,以阻止羊弓形虫的聚集性流行。本研究对羊弓形虫病的科学防控决策的制定具有重要指导意义。

关键词：地理信息系统(GIS) 动物流行病学弓形虫羊

Pseudo-Harmonic Oscillatory Ring-Shaped Potential in a Relativistic Equation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第11期29卷 17-19页

作者： M.eshghi Department of Physics Faculty of SciencesImam Hossein Comprehensive UniversityTehranIran

Exact solutions of the Dirac equation are studied for the pseudo-harmonic oscillatory ring-shaped potential by using the Laplace transform approach and the Nikiforov–Uvarov(NU)*** normalized eigenfunctions are expressed in terms of hyper-geometric series and use the NU and Laplace methods to obtain the eigenvalues *** obtained result of the eigenvalue equation is *** the end,one can find with a simple transformation the lower spinor component of the Dirac equation.

关键词： equation method equation

Quantum pseudodots under the influence of external vector and scalar fields

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

Chinese Physics B 2018年第8期27卷 109-117页

作者： M eshghi S M Ikhdairt Department of Physics Imam Hossein Comprehensive UniversityTehranIran Department of Physics Faculty of ScienceAn-Najah National UniversityNablusPalestine Department of Electrical Engineering Near East UniversityNicosiaNorthern CyprusMersin 10Turkey

We study the spherical quantum pseudodots in the Schr6dinger equation by using the pseudo-harmonic plus harmonic oscillator potentials considering the effect of the external electric and magnetic fields. The finite energy levels and the wave functions are calculated. Furthermore, the behavior of the essential thermodynamic quantities such as, the free energy, the mean energy, the entropy, the specific heat, the magnetization, the magnetic susceptibility, and the persistent currents are also studied by using the characteristic function. Our analytical results are found to be in good agreement with the other works. The numerical results on the energy levels as well as the thermodynamic quantities have also been given.

关键词： Schr6dinger equation harmonic oscillator pseudo-harmonic potential thermodynamic quantities quantum pseudo-dots characteristic function

Two-phase flow component fraction measurement using gamma-ray attenuation technique

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2017年第6期28卷 196-202页

作者： Mohsen Sharifzadeh hosein Khalafi hosein Afarideh Ehsanallah Noori Radiation Application Research School Nuclear Science and Technology Research Institute Department of Energy Engineering and Physics AmirKabir University of Technology Nuclear Science and Technology Research Institute Plasma Research School Nuclear Science and Technology Research Institute

Multiphase flow meters as the potential alternatives to separation and metering techniques have been in rapid development since 1980 *** its field operation,the instrument should be calibrated in a standard *** spite of the known medium and large scale facilities all over the world,we developed a laboratory scale instrument for component fraction *** has a two-phase flow homogenizer loop with the clamp-on potential of the meters to provide a regime independent *** is capable of delivering a complete homogenization by γ-ray *** an error of±5%in component fraction measurements,this instrument is appropriate for testing and calibrating other meters.

关键词： Component fraction measurement Homogenization MATLAB-Based algorithm Pencilbeam collimation Gamma-ray attenuation

Relativistic effect of pseudospin symmetry and tensor coupling on the Mie-type potential via Laplace transformation method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第12期23卷 44-49页

作者： M.eshghi S.M.Ikhdair Young Researchers and Elite Club Central Tehran Branch Islamic Azad University Department of Physics Faculty of Science An-Najah National University

A relativistic Mie-type potential for spin-1/2 particles is studied. The Dirac Hamiltonian contains a scalar S（r） and a vector V（r） Mie-type potential in the radial coordinates, as well as a tensor potential U（r） in the form of Coulomb potential. In the pseudospin（p-spin） symmetry setting Σ = Cps and Δ = V（r）, an analytical solution for exact bound states of the corresponding Dirac equation is found. The eigenenergies and normalized wave functions are presented and particular cases are discussed with any arbitrary spin–orbit coupling number κ. Special attention is devoted to the caseΣ = 0 for which p-spin symmetry is exact. The Laplace transform approach（LTA） is used in our calculations. Some numerical results are obtained and compared with those of other methods.

关键词： Dirac equation Mie-type potential Laplace transform approach tensor interaction p-spin symmetry