检索结果-南通市图书馆

Propagation dynamics of relativistic electromagnetic solitary wave as well as modulational instability in plasmas

Chinese Physics b 2021年第1期30卷 332-344页

作者： Rong-An Tang Tiao-Fang Liu Xue-Ren Hong Ji-Ming Gao rui-Jin Cheng You-Lian Zheng Ju-Kui Xue Key Laboratory of Atomic and Molecular Physics and Functional Materials of Gansu Province College of Physics and Electronic EngineeringNorthwest Normal UniversityLanzhou 730070China

by one-dimensional particle-in-cell(PIC) simulations, the propagation and stability of relativistic electromagnetic(EM) solitary waves as well as modulational instability of plane EM waves are studied in uniform cold electron-ion *** investigation not only confirms the solitary wave motion characteristics and modulational instability theory, but more importantly, gives the following findings. For a simulation with the plasma density 10^(23) m^(-3) and the dimensionless vector potential amplitude 0.18, it is found that the EM solitary wave can stably propagate when the carrier wave frequency is smaller than 3.83 times of the plasma frequency. While for the carrier wave frequency larger than that, it can excite a very weak Langmuir oscillation, which is an order of magnitude smaller than the transverse electron momentum and may in turn modulate the EM solitary wave and cause the modulational instability, so that the solitary wave begins to deform after a long enough distance propagation. The stable propagation distance before an obvious observation of instability increases(decreases) with the increase of the carrier wave frequency(vector potential amplitude). The study on the plane EM wave shows that a modulational instability may occur and its wavenumber is approximately equal to the modulational wavenumber by Langmuir oscillation and is independent of the carrier wave frequency and the vector potential *** reveals the role of the Langmuir oscillation excitation in the inducement of modulational instability and also proves the modulational instability of EM solitary wave.

关键词： electromagnetic solitary wave particle-in-cell(PIC)simulation modulational instability Langmuir oscillation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of perioperative managements on ocular surface microbiota in intravitreal injection patients

引用

International Journal of Ophthalmology(English edition) 2022年第2期15卷 248-254页

作者： Ya-Guang Hu Qiong Wu Tian-Hui Li Fang Sui Ming Zhang Zhen Zhang rui Shi Na Hui Li Qin Li Li Department of Ophthalmology the First Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061Shaanxi ProvinceChina Department of Ophthalmology Northwest Women and Children's HospitalXi'an 710061Shaanxi ProvinceChina Key Laboratory of biomedical Information Engineering Ministry of EducationXi'an 710049Shaanxi ProvinceChina Department of biomedical Engineering School of Life Science and TechnologyXi'an Jiaotong UniversityXi'an 710049Shaanxi ProvinceChina Department of Otorhinolaryngology-Head and Neck Surgery the First Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061Shaanxi ProvinceChina Department of Ophthalmology Shaanxi Provincial People's HospitalXi'an 710068Shaanxi ProvinceChina Xi'an Huaxia Eye Hospital Xi'an 710061Shaanxi ProvinceChina

AIM:To investigate the effects of on ocular surface microbiota in patients who received intravitreal ***:Samples of ocular surface microbiota were obtained from 41 eyes of 41 patients who visited the Department of *** were separated for three *** A did not receive perioperative managements or intravitreal *** b1 received only once and b2 received more than *** operating room,the samples were collected on the ocular *** taxonomic units(OTUs) clustering and alpha/beta diversity analysis was *** microbial 16S rRNA from samples were analyzed using the Hi Seq 2500 ***:Alpha diversity did not differ in each group,and beta diversity differed in the b2 *** diversity showed a significant difference between Group A and b2(P=0.048).With the perioperative managements before intravitreal injection,the composition and relative abundance were *** 10 microbiota on phylum and genus level,and then microbiota notably changed at genus level were ***-negative bacteria were varied ***,Proteus was not found in Groups A and b1,but it was appeared after the patients received perioperative management and intravitreal injections in Group ***:With the perioperative managements,the balance of microbiota on the ocular surface is destroyed,and relative composition and abundance of microbiota on the ocular surface is obviously *** clinical doctors should pay more attention on the consequence of perioperative managements before intravitreal injection.

关键词： microbiota perioperative managements ocular surface intravitreal injection high-throughput sequencing

来源：

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

Chromosome analysis of esophageal squamous cell carcinoma cell line KYSE 410-4 by repetitive multicolor fluorescence in situ hybridization

引用

Journal of Genetics and Genomics 2008年第1期35卷 11-16页

作者： Yiling Yang a, b, Jiayou Chu a, Yupeng Wu b, Manli Luo b, Xin Xu b, Yaling Han b, Yan Cai b, Qimin Zhanb, Mingrong Wang b, a Department of Genetics, Institute of Medical biology, Peking Union Medical College and Chinese Academy of Medical Sciences, Kunming 650118, China b State Key Laboratory of Molecular Oncology, Cancer Institute (Hospital), Peking Union Medical College and Chinese Academy of Medical Sciences, beijing 100021, China Department of Genetics Institute of Medical Biology Peking Union Medical College and Chinese Academy of Medical Sciences Kunming 650118 China State Key Laboratory of Molecular Oncology Cancer Institute (Hospital) Peking Union Medical College and Chinese Academy of Medical Sciences Beijing 100021 China

Chromosome aberrations are distinctive features of human malignant tumors. Analysis of chromosomal changes can illuminate the molecular mechanisms underlying the development and progression of cancer. To establish the technique of multicolor fluorescence in situ hybridization (M-FISH) for identifying chromosome aberrations in esophageal carcinoma cell line KYSE 410-4, four pools of 6-color whole-chromosome painting probes have been designed and hybridized on the same metaphase spread by four rounds of repetitive FISH. Repetitive 6-color M-FISH was successfully established and the cytogenetic abnormalities in KYSE 410-4 cells were characterized. Chromosome gains occurred at 2q, 3, 8, 17p, and X. An isochromosome 3q was visualized in the cell line, which might be one intermedi- ate mechanism leading to 3p losses and/or 3q gains. Furthermore, 16 structural arrangements were detected, including four derivative chromosomes. The rearrangement of the centromeric regions accounted for approximately 44% of all rearrangements. The results added a more complete and accurate information of the genetic alterations to the classical cytogenetic description of KYSE 410-4 and provided a detailed cytogenetic background data for appropriate use of the cell line. The established 6-color M-FISH was useful for analyzing chro- mosomes in the whole genome of human tumors.

关键词： multicolor fluorescence in situ hybridization KYSE 410-4 karyotype esophageal squamous cell carcinoma

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

一株高产琼胶酶菌株MA-b22的分子鉴定与产酶条件优化

引用

水产学报 2009年第6期33卷 1037-1043页

作者：卢斌柯才焕杨明康康赵晶厦门大学海洋与环境学院

琼胶酶在多糖降解应用中的作用日益重要,而从海洋微生物中筛选琼胶酶高产菌株成为一个重要途径。本研究从养殖的杂色鲍体内分离到一株高产琼胶酶的菌株MA-b22。该菌为革兰氏阴性菌,经16S rRNA序列鉴定表明,与Tamlana agarivorans ***.具... 详细信息

琼胶酶在多糖降解应用中的作用日益重要,而从海洋微生物中筛选琼胶酶高产菌株成为一个重要途径。本研究从养殖的杂色鲍体内分离到一株高产琼胶酶的菌株MA-b22。该菌为革兰氏阴性菌,经16S rRNA序列鉴定表明,与Tamlana agarivorans ***.具有99%同源性,因此初步定为Tamlana sp.。在2216E培养基中该菌株在培养时间60h,温度25℃,起始pH为6.0条件下产酶活性最高。基于上述培养条件,通过单因素和正交实验确定了培养基的最佳基本组成:氮源为牛肉膏(其最适浓度为6.0‰),碳源为琼脂(其最适浓度为2.5‰),配制培养基的人工海水的最适盐度为25。经培养条件优化后,该菌胞外琼胶酶活力可达1021.79U/mL,较优化前提高8.82倍。实验首次对Tamlana sp.属的琼胶酶活性进行确定并优化其产酶条件,为构建琼胶酶高产工程菌株提供了基础,并可能为今后鲍养殖提供潜在的益生菌。

关键词：琼胶酶酶活力培养基

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Sterilization of mycete attached on the unearthed silk fabrics by an atmospheric pressure plasma jet

引用

Chinese Physics b 2018年第5期27卷 390-399页

作者： rui Zhang Jin-song Yu Jun Huang Guang-liang Chen Xin Liu Wei Chen Xing-quan Wang Chao-rong Li Key Laboratory of Advanced Textile Materials and Manufacturing Technology and Engineering Research Center for Eco-Dyeing & Finishing of Textiles Ministry of Education Zhejiang Sci-Tech University Hangzhou 310018 China Department of Chemistry and Chemical Engineering University of New Haven 300 Boston Post Road West Haven Connecticut 06516 USA College of Physics and Electronic Information Gannan Normal University Ganzhou 341000 China State Key Laboratory for Hubei New Textile Materials and Advanced Processing Technology Wuhan Textile University Wuhan 430200 China

The sterilization of the simulated unearthed silk fabrics using an atmospheric pressure plasma jet（APPJ） system employing Ar/O2 or He/O2 plasma to inactivate the mycete attached on the silk fabrics is reported. The effects of the APPJ characteristics（particularly the gas type and discharge power） on the fabric strength, physical-chemical structures,and sterilizing efficiency were investigated. Experimental results showed that the Ar/O2 APPJ plasma can inactivate the mycete completely within 4.0 min under a discharge power of 50.0 W. Such an APPJ treatment had negligible impact on the mechanical strength of the fabric and the surface chemical characteristics. Moreover, the Ar ions, O and OH radicals were shown to play important roles on the sterilization of the mycete attached on the unearthed silk fabrics.

关键词： unearthed silk fabric mycete sterilization atmospheric pressure plasma jet (APPJ) sterilization mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Comparison of Dust Lattice Waves in Three-Dimensional Cubic Configurations

引用

Chinese Physics Letters 2012年第2期29卷 144-147页

作者： b.Farokhi A.Hameditabar Department of Physics Faculty of ScienceArak-University38156-8-8349ArakIran

A three-dimensional (3D) dusty plasma crystalline with cubic configurations is *** calculate the interaction between particles up to distance (√2)a,implying the second-neighbor interactions for the simple cubic structure,the third-neighbor interactions for the body-centered cubic structure,and the forth-neighbor interactions the for face-centered cubic *** and transverse dispersion relations are derived in arbitrary *** dispersion relations are studied in special directions,i.e.(1,0,0),(1,1,0)/(√2),and (1,1,1)/(√3).Study of dispersion relations with more neighbor interactions show that in some cases the results change physically.

关键词： structure cubic neighbor

来源：

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

Coulomb.and nuclear interactions in the dynamics of weakly-bound neutron-halo breakup on heavy target

引用

Chinese Physics C 2022年第1期46卷 157-166页

作者： b.Mukeru Lauro Tomio Department of Physics University of South AfricaP.O.Box 392Pretoria 0003South Africa Instituto de Física Téorica Universidade Estadual Paulista01140-070 São PauloSPBrazil

Within our aim to clarify some aspects of the breakup dynamics of loosely-bound neutron-halo projectiles on a heavy target,we apply the continuum discretized coupled-channel formalism to investigate the beryllium^(11)be breakup on a lead^(208)Pb target atE_(lab)=140 MeV incident *** evidencing that the continuum–continuum couplings are much stronger in the nuclear breakup than in the Coulomb breakup,we conclude that the strength of these couplings in the total breakup is dominated by the nuclear contribution,with the diagonal monopole nuclear potential in the projectile–target center-of-mass having negligible effect on the total and nuclear breakup *** this kind of reaction,we show that the condition for the total breakup to approach its dominant component in the absorption region is strongly dependent on the continuum–continuum couplings and the diagonal monopole nuclear potential.

关键词： Coulomb breakup nuclear breakup total breakup elastic scattering channel

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

bone Loss Induced by Simulated Microgravity,Ionizing Radiation and/or Ultradian Rhythms in the Hindlimbs of Rats

引用

biomedical and Environmental Sciences 2018年第2期31卷 126-135页

作者： ZHANG Ya Nan SHI Wen Gui LI He HUA Jun rui FENG Xiu WEI Wen Jun WANG Ju Fang HE Jin Peng LEI Su Wen Key Laboratory of Space Radiobiology of Gansu Province&CAS Key Laboratory of Heavy Ion Radiation biology and Medicine Institute of Modern PhysicsChinese Academy of SciencesLanzhou 730000GansuChina University of Chinese Academy of Sciences Beijing 100049China Office of Health Standards Chinese Center for Disease Control and PreventionBeijing 102206China

Objective To better understand the pathological causes of bone loss in a space environment, including microgravity, ionizing radiation, and ultradian *** Sprague Dawley （SD） rats were randomly divided into a baseline group, a control group, a hindlimb suspension group, a radiation group, a ultradian rhythms group and a combined-three-factor group. After four weeks of hindlimb suspension followed by X-ray exposure and/or ultradian rhythms, biomechanical properties, bone mineral density, histological analysis, microstructure parameters, and bone turnover markers were detected to evaluate bone loss in hindlimbs of *** Simulated microgravity or combined-three factors treatment led to a significant decrease in the biomechanical properties of bones, reduction in bone mineral density, and deterioration of trabecular parameters. Ionizing radiation exposure also showed adverse impact while ultradian rhythms had no significant effect on these outcomes. Decrease in the concentration of the turnover markers bone alkaline phosphatase （bALP）, osteocalcin （OCN）, and tartrate-resistant acid phosphatase-5b （TRAP-Sb） in serum was in line with the changes in trabecular *** Simulated microgravity is the main contributor of bone loss. Radiation also results in deleterious effects but ultradian rhythms has no significant effect. Combined-three factors treatment do not exacerbate bone loss when compared to simulated microgravity treatment alone.

关键词： bone loss Microgravity Radiation Ultradian rhythms

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Thermal Entanglement in a Two-Qubit Ising Chain Subjected to Dzyaloshinsky–Moriya Interaction

引用

Chinese Physics Letters 2013年第12期30卷 5-8页

作者： b.G.Divyamani Sudha Department of Physics Kuvempu UniversityShankaraghattaShimoga-577451India Tunga Mahavidyalaya TirthahalliShimoga-577451India Inspire Institute Inc. AlexandriaVirginia22303USA

Thermal entanglement of a two-qubit Ising chain subjected to an external magnetic field and Dzyaloshinsky–Moriya(DM)interaction is *** effect of magnetic field,strength of DM interaction and temperature are analyzed by adopting negativity of partial transpose as the measure of *** is shown that when the DM interaction along the Ising axis is considerable,thermal entanglement can be sustained for a higher *** usefulness of longitudinal DM interaction over the one that is perpendicular to the Ising axis,in the manipulation and control of entanglement at a feasible temperature,is illustrated.

关键词： temperature Ising interaction

来源：

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

聚二甲基硅氧烷水膜对3种蚊虫的实验室控制效果研究

引用

中国媒介生物学及控制杂志 2024年第2期35卷 133-137页

作者：张铭洧段金花邓惠芦瑞鹏陈宗晶林立丰南方医科大学公共卫生学院广东广州510515 广东省疾病预防控制中心消毒与病媒生物预防控制所广东广州511430

目的评价和比较实验室条件下聚二甲基硅氧烷水膜对致倦库蚊、白纹伊蚊、埃及伊蚊不同龄期幼虫和蛹的防治效果。方法挑选不同龄期的幼虫和蛹各30只,分别置于1 ml/m^(2)水膜的水体中,在实验室环境或人工培养箱设置的不同温度下观察幼虫或... 详细信息

目的评价和比较实验室条件下聚二甲基硅氧烷水膜对致倦库蚊、白纹伊蚊、埃及伊蚊不同龄期幼虫和蛹的防治效果。方法挑选不同龄期的幼虫和蛹各30只,分别置于1 ml/m^(2)水膜的水体中,在实验室环境或人工培养箱设置的不同温度下观察幼虫或蛹的生长、发育及死亡情况,通过Excel 2016和SPSS 27.0软件进行数据的整理和分析,通过log-rank检验比较各组幼虫或蛹接触水膜后的生存曲线,采用独立样本t检验比较不同组的幼虫长度。结果在1 ml/m^(2)的水膜作用下,致倦库蚊、白纹伊蚊和埃及伊蚊Ⅰ~Ⅱ龄幼虫的半数致死时间分别为2.67、7.04和6.45 d,Ⅲ~Ⅳ龄幼虫分别为0.53、1.64和1.71 d,蛹分别为96.68、115.54和109.77 min;饲养7 d后,致倦库蚊、白纹伊蚊和埃及伊蚊水膜组平均虫体长度分别为(3.28±0.40)、(3.17±0.61)和(3.21±0.47)mm,明显小于相应的对照组(均P<0.001);在20、25、30和35℃下水膜组幼虫的死亡率随温度的升高而升高,致倦库蚊第1天的死亡率分别为66.67%、71.11%、91.11%和100%,白纹伊蚊分别为8.89%、30.00%、55.56%和81.11%,埃及伊蚊分别为14.44%、25.56%、56.67%和75.56%。结论聚二甲基硅氧烷水膜对3种蚊幼虫及蛹均有较好的控制效果,可抑制幼蚊的生长发育,同时环境温度的升高对水膜的功效有促进作用,适合于多种蚊虫的防控。

关键词：聚二甲基硅氧烷水膜致倦库蚊白纹伊蚊埃及伊蚊实验室效果

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：