检索结果-南通市图书馆

Fractal sorting vector-based least significant bit chaotic permutation for image encryption

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第6期30卷 226-235页

作者： yong-Jin Xian Xing-Yuan Wang Ying-qian Zhang xiao-Yu Wang xiao-Hui Du School of Information Science and Technology Dalian Maritime UniversityDalian 116026China School of Information Science and Technology Xiamen University Tan Kah Kee CollegeZhangzhou 363105China

The image's least significant bit(LSB) covers lots of the details that have been commonly used in image encryption analysis. The newly proposed fractal sorting vector(FSV) and FSV-based LSB chaotic permutation(FSV-LSBCP) is a novel chaotic image encryption cryptosystem introduced in this article. The FSV-LSBCP effectively strengthens the security of the cryptographic scheme concerning the properties of the FSV. Key analysis, statistical analysis, resistance differential attack analysis, and resistance to cropping attacks and noise attacks are the focus of the suggested image encryption cryptosystem. The security experiment shows that the cryptosystem is adequate to achieve the desired degree of security.

关键词： chaotic image encryption fractal sorting vector bit-level permutation FSV-based LSB chaotic permutation

Local Environmental Dependence of Galaxy Properties in a Volume-Limited Sample of Main Galaxies

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第5期7卷 639-648页

作者： Xin-Fa Deng Ji-Zhou He Qun Zhang xiao-Xia qian Peng Jiang yong Xin School of Science Nanchang University Nanchang 330031

Using a volume-limited sample of Main Galaxies from SDSS Data Release 5, we investigate the dependence of galaxy properties on local environment. For each galaxy, a local three-dimensional density is calculated. We find that the galaxy morphological type depends strongly on the local environment; galaxies in dense environments have predominantly early type morphologies. Galaxy colors have only a weak dependence on the environment. This puts an important constraint on the process of galaxy formation.

关键词： galaxy distances and redshifts -- galaxies statistics

糖尿病肾病模型:动物模型、二维细胞模拟及三维类器官模型

在线全文

学校读者我要写书评

暂无评论

中国组织工程研究 2025年第17期29卷 3632-3640页

作者：钱足平陈勇冉燕达静静查艳遵义医科大学贵州省遵义市563000 贵州省人民医院肾内科贵州省贵阳市550002

背景:近几年来,人类多能干细胞衍生的肾类器官及糖尿病肾病啮齿动物模型取得了一定的进展。然而,由于糖尿病肾病发病受环境因素及遗传因素共同作用,发病机制复杂,并且对于此类患者的临床治疗方法需要因人而异。因此,需要开发更灵活和综... 详细信息

背景:近几年来,人类多能干细胞衍生的肾类器官及糖尿病肾病啮齿动物模型取得了一定的进展。然而,由于糖尿病肾病发病受环境因素及遗传因素共同作用,发病机制复杂,并且对于此类患者的临床治疗方法需要因人而异。因此,需要开发更灵活和综合的方法,从而发现强有力的临床前证据,以支持对糖尿病肾病患者进行更有针对性的干预。目的:从动物模型、二维细胞培养模拟及三维类器官模型等方面综述了糖尿病肾病模型的研究进展,为进一步的研究提供线索和思路。方法:以“糖尿病,糖尿病肾病,糖尿病肾病模型,糖尿病肾病动物模型,类器官,肾脏类器官,糖尿病肾病细胞模型,糖尿病肾病病证结合动物模型”为中文检索词,“Diabetes,diabetic nephropathy,diabetic kidney diseases,diabetic nephropathy models,diabetic nephropathy animal models,organoids,diabetic and organoids,diabetic and kidney organoids,kidney organoids,diabetic nephropathy cell models,diabetic nephropathy syndrome combined animal models”为英文检索词,检索中国知网及PubMed数据库,最终纳入101篇文献进行综述分析。结果与结论:糖尿病肾病体内模型和体外模型是深入研究糖尿病肾病发病机制的有力工具。动物模型可以观察到多系统之间的相互作用;二维细胞培养操作简便且成本较低;新兴的肾类器官填补了二维和整体水平之间的空白,无种属差异且一定程度模拟了人肾脏的复杂性。随着类器官技术的不断发展,肾类器官有望为探索糖尿病肾病的发病机制、病理生理过程和药物筛选提供一个新的视角。

关键词：糖尿病肾病肾脏类器官糖尿病肾病类器官细胞模型动物模型中医病证结合糖尿病肾病模型工程化组织构建

在线全文

学校读者我要写书评

暂无评论

VE对鲜切荸荠酶促褐变的影响

保鲜与加工 2021年第10期21卷 23-28页

作者：肖永谦叶海霞王诗韵闻金敏李煜林夏险食用野生植物保育与利用湖北省重点实验室(湖北师范大学) 湖北黄石435002 贺州学院食品科学与工程技术研究院广西贺州542800

以新鲜荸荠为试材,以褐变指数为评价指标,研究了VE浓度和处理时间对鲜切荸荠酶促褐变的影响,结果表明,抑制鲜切荸荠酶促褐变的最佳处理为0.04%的VE无水乙醇(1%)水溶液,处理时间为30 min。分别将最佳工艺处理样品和对照样品在1℃条件下贮... 详细信息

以新鲜荸荠为试材,以褐变指数为评价指标,研究了VE浓度和处理时间对鲜切荸荠酶促褐变的影响,结果表明,抑制鲜切荸荠酶促褐变的最佳处理为0.04%的VE无水乙醇(1%)水溶液,处理时间为30 min。分别将最佳工艺处理样品和对照样品在1℃条件下贮藏,分析二者的褐变指数、多酚氧化酶(PPO)活性、总可溶性固形物(TSS)含量、硬度、VC含量。结果表明:VE抑制了鲜切荸荠PPO活性的升高,从而可以抑制鲜切荸荠酶促褐变4~6 d,同时抑制了TSS含量的增加、硬度和VC含量的下降。

关键词：鲜切荸荠褐变指数 VE 贮藏理化分析

Effects of Ligustrazine on Airway Inflammation in A Mouse Model of Neutrophilic Asthma

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2018年第5期24卷 353-358页

作者： LIU xiao-ming1 WANG yong-bin2 WU qian2 BIAN Zhong-rui2 CHE xiao-wen2 Department of Geriatric Medicine the Affiliated Hospital of Shandong University of Traditional Chinese Medicine Department of Respiratory Medicine the Second Hospital of Shandong University

Objective: To investigate the effects of ligustrazine(LTZ) on airway inflammation in a mouse model of neutrophilic asthma(NA). Methods: Forty healthy C57 BL/6 female mice were randomly divided into 4 groups using a random number table, including the normal control, NA, LTZ and dexamethasone(DXM) groups, with 10 rats in each group. The NA mice model was established by the method of ovalbumin combined with lipopolysaccharide sensitization. At 0.5 h before each challenge, LTZ and DXM groups were intraperitoneally injected with LTZ(80 mg/kg) or DXM(0.5 mg/kg) for 14 d, respectively, while the other two groups were given the equal volume of normal saline. After last challenge for 24 h, the aerosol inhalation of methacholine was performed and the airway reactivity was measured. The bronchoalveolar lavage fluid(BALF) was collected. The Wright-Giemsa staining was used for total white blood cells and differential counts. The levels of cytokines interleukin(IL)-17 and IL-10 were detected by enzyme-linked immunosorbent assay. The pathological change of lung tissue was observed by hematoxylin eosin staining. Results: The airway responsiveness of the NA group was significantly higher than the normal control group(P<0.05), while those in the LTZ and DXM groups were significantly lower than the NA group(P<0.05). The neutrophil and eosinophil counts in the LTZ and DXM groups were significantly lower than the NA group(P<0.05), and those in the LTZ group were significantly lower than the DXM group(P<0.05). There were a large number of peribronchiolar and perivascular inflammatory cells in filtration in the NA group. The airway inflammation in the LTZ and DXM groups were significantly alleviated than the NA group. The infiltration in the LTZ group was significantly reduced than the DXM group. Compared with the normal control group, the IL-17 level in BALF was significantly increased and the IL-10 level in BALF was significantly decreased in the NA group(P<0.05). LTZ and DXM treatment

关键词： ligustrazine neutrophilic asthma airway inflammation cytokine

Effect of Magnetic-Impurity Scattering in Disordered Two-Dimensional Square Lattices Around Half Filling

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2005年第5X期44卷 929-935页

作者： qian Feng YANG yong-Hong Department of Physics Southeast University Nanjing 210096 China National Laboratory of Solid State Microstructures Nanjing University Nanjing 210008 China

Abstract Weak-localization effect in the presence of magnetic impurities is studied in disordered two-dimensional tight-binding square lattices around half filling. Both the magnetic and nonmagnetic impurities are assumed to be randomly distributed on small fractions of the sites, while the nonmagnetic impurities have a strong potential yielding a unitary-limit scattering. We derive in details the expressions of diffusive π modes in the retarded-retarded （or advanced- advanced） channel, which result from the existence of particle-hole symmetry. The quantum interference correction to the density of states is calculated. While the magnetic-impurity scattering suppresses the quantum correction from π-mode cooperon, it does not affect the contribution of π-mode diffuson.

关键词： weak localization magnetic impurity density of states two-dimensional lattice

Response to children's physical and mental needs during the COVID-19 outbreak

在线全文

学校读者我要写书评

暂无评论

World Journal of Pediatrics 2020年第3期16卷 278-279页

作者： xiao-Bo Zhang yong-Hao Gui Xiu Xu Da-qian Zhu Yi-Hui Zhai xiao-Ling Ge Hong Xu Department of Respiratory Medicine Children's Hospital of Fudan UniversityShanghai 201102China Shanghai Medical College Fudan UniversityShanghai 201102China Department of Child Health Care Children's Hospital of Fudan UniversityShanghai 201102China Department of Psychology Children's Hospital of Fudan UniversityShanghai 201102China Department of Nephrology Children's Hospital of Fudan UniversityShanghai 201102China Department of Statistics and Data Management Children's Hospital of Fudan UniversityShanghai 201102China

School closure and stay-at-home,as a part of non-pharmaceutical interventions (NPI),have been implemented in China since February as an effective way to mitigate the spread of the virus during the COVID-19 *** concerns rose over the potential impacts of such NPI measures on children's health,such as longer exposure to digital screens,irregular sleep pattern,weight gain,and loss of cardiorespiratory fitness [1],the Chinese Government,experts on public health,educators on school health,and teachers have been making joint and massive efforts to provide distance learning with well-organized online courses to help.

关键词： massive children closure

Effectiveness of co-treatment with traditional Chinese medicine and letrozole for polycystic ovary syndrome:a meta-analysis

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 Integrative Medicine 2017年第2期15卷 95-101页

作者： qian-wen Ma yong Tan The First Clinical Medical College Nanjing University of Chinese Medicine Department of Gynecology Zhenjiang Hospital of Traditional Chinese Medicine

BACKGROUND： Polycystic ovary syndrome （PCOS） is an endocrine disease that affects gynecologica health. Treatment of PCOS remains a big challenge for clinicians. OBJECTIVE： This meta-analysis was developed to compare the efficacy of co-treatment with traditiona Chinese medicine （TCM） and letrozole against letrozole monotherapy in the treatment of PCOS. SEARCH STRATEGY： Randomized controlled trials （RCTs） were electronically retrieved from PubMed, Cochrane Library, China Biomedical Literature Database, China National Knowledge Infrastructure and Wanfang Data; related papers that were not available electronically were manually checked. All papers were assessed according to the Cochrane Handbook for Systematic Reviews of Interventions and the valid data were analyzed using Revman software （The Cochrane Collaboration, Copenhagen, Denmark） INCLUSION CRITERIA： We included RCTs that compared co-treatment with TCM and letrozole against letrozole monotherapy in women with PCOS, which was defined by anovulation, biochemical or clinical hyperandrogenemia and polycystic ovaries. We included trials from all sources. DATA EXTRACTION AND ANALYSIS： Two independent reviewers extracted data, and evaluated study quality according to the Cochrane Handbook for Systematic Reviews of Interventions criteria for RCT, including issues of patient randomization, blinding and bias. RESULTS： Eight RCTs, involving a total of 537 patients, were included in the present study. The meta-analysis showed that the cycle ovulation rate, the pregnancy rate and the total effective rate of symptom treatment were higher in treatments combining TCM with letrozole, compared with letrozole monotherapy. Although the rate of luteinizing hormone （LH）/follicle-stimulating hormone （FSH） and the body mass index of the group receiving combined therapy were lower than in letrozole monotherapy, no statistical difference was found in the LH and FSH level between the two groups. CONCLUSION： Available evidence showed that c

关键词： medicine, Chinese traditional letrozole polycystic ovary syndrome meta-analysis

Bibliometric analysis of research relating to refractive cataract surgery over a 20-year period:from 2003 to 2022

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2023年第10期16卷 1692-1701页

作者： xiao-yong Chen qian-Ru Wu Min-Yue Xie Di Zhang Chun Zhang Department of Ophthalmology Beijing Key Laboratory of Restoration of Damaged Ocular NervePeking University Third HospitalBeijing 100191China Beijing Tongren Eye Center Beijing Tongren HospitalBeijing Institute of OphthalmologyCapital Medical UniversityBeijing 100730China

AIM:To investigate the research trend on refractive cataract surgery,compare the contributions of different countries,institutions,journals,and authors in the past 20y,and explore its potential research ***:All publications were extracted relating to refractive cataract surgery from 2003 to 2022 from Web of *** types were limited to original articles and reviews,and the language was limited to *** and qualitatively of the publications were analyzed through Microsoft Excel and GraphPad *** and CiteSpace were used for bibliometric and visualized ***:A total of 2090 publications were *** United States contributed the most publications(434,20.8%),followed by China(345,16.5%)and England(163,7.80%).Publications from the United States were cited more frequently(9552 citations)with the highest H-index of *** ranked second in the total number of publications,the papers were not cited that frequently(3237 citations),and the H-index ranked sixth(H-index=29).Journal of Cataract and Refractive Surgery published the most papers(333,15.9%),and the University of London had the highest number of publications(75,3.59%).Dick HB from Germany published the most *** astigmatism-related research,cataract surgery methodrelated research,postoperative visual-quality relate to research,and postoperative complications-relate research are the hotspots in this *** most significant limitation was that the database was updated frequently and the latest publications were not ***:The bibliometric analysis shows a brief summarization of the contribution of the authors,institutions,countries,and *** astigmatism,cataract surgery method,postoperative visual-quality and postoperative complications related researches have become the emerging hotspots,which can give a direction in the future researches.

关键词： bibliometric analysis cataract surgery refractive cataract surgery corneal astigmatism