检索结果-南通市图书馆

Science china mathematics 2011年第10期54卷 2253-2257页

作者： hai jinke LI ZhengXing College of mathematics Qingdao University Qingdao 266071 China

Let G = NwrA be a wreath product of a finite nilpotent group N by an abelian group A. It is shown that every Coleman automorphism of G is an inner automorphism. As an immediate consequence of this result,it is obtaine... 详细信息

关键词： Coleman automorphisms wreath products the normalizer problem

集合上非一一变换构成的群及其在矩阵代数中的表现

在线全文

学校读者我要写书评

暂无评论

首都师范大学学报（自然科学版） 2003年第2期24卷 5-14页

作者：朱一心海进科首都师范大学数学系北京100037 青岛大学数学系青岛266071

发现任意集合A上一个由非一一变换关于变换乘法构成的群与A的某个子集上一个变换群的同构 ;证明A上一个非一一变换f能出现在一个由A上变换构成的乘法群中当且仅当f(A)上的限制ResAf(A) f为f(A)上一一变换 .然后将结论用到矩阵代数中 ,... 详细信息

发现任意集合A上一个由非一一变换关于变换乘法构成的群与A的某个子集上一个变换群的同构 ;证明A上一个非一一变换f能出现在一个由A上变换构成的乘法群中当且仅当f(A)上的限制ResAf(A) f为f(A)上一一变换 .然后将结论用到矩阵代数中 ,给出数域F上n级矩阵M满足秩M =秩M2 的充要条件 .

关键词：集合非一一变换变换群乘法群矩阵代数变换乘法

在线全文

学校读者我要写书评

暂无评论

马克思对“人的价值”之类命题的批判

山东大学学报（哲学社会科学版） 2001年第1期 47-52页

作者：李毅嘉秦尚海山东大学哲学系山东济南250100 青岛海洋大学山东青岛266003

马克思认为：“人的价值”之类的命题在本质上是资本主义经济的思想反映。因而，它决非是关于人的本性、尊严和幸福的永恒观念，而仅仅是资产阶级的特殊要求、愿望和幻想的反映。它同共产主义的世界观是根本对立的。在共产主义社会中，... 详细信息

马克思认为：“人的价值”之类的命题在本质上是资本主义经济的思想反映。因而，它决非是关于人的本性、尊严和幸福的永恒观念，而仅仅是资产阶级的特殊要求、愿望和幻想的反映。它同共产主义的世界观是根本对立的。在共产主义社会中，新的命题“每一个人的自由发展”将取代陈腐的命题“人的价值”。

关键词：人的价值按能力分配人的自由发展

在线全文

学校读者我要写书评

暂无评论

基于概率统计及查询质量的数据源选择策略

计算机科学 2004年第11期31卷 102-104页

作者：张春海刘群李华中国海洋大学计算机科学系青岛266071

数据源选择策略对提高异构数据集成效率具有重要意义。综合考虑概率统计信息和数据源相对执行质量,提出一种新的数据源选择策略。概率统计信息通过分析查询日志得到,包括针对频繁主题类的数据源覆盖度和数据源集合重叠度。数据源相对执... 详细信息

数据源选择策略对提高异构数据集成效率具有重要意义。综合考虑概率统计信息和数据源相对执行质量,提出一种新的数据源选择策略。概率统计信息通过分析查询日志得到,包括针对频繁主题类的数据源覆盖度和数据源集合重叠度。数据源相对执行质量包括查询价格、执行时延、数据源可靠性和用户满意度。给出基于以上标准的数据源选择贪心算法,并通过实验原型验证算法有效性。

关键词：数据源查询异构数据集成日志贪心算法验证算法时延选择策略执行用户满意度

New insights into the deposition of natural gas hydrate on pipeline surfaces:A molecular dynamics simulation study

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 694-704页

作者： Jun Zhang hai-Qiang Fu Mu-Zhi Guo Zhao Wang Li-Wen Li Qi Yin You-Guo Yan Wei Wei Wei-Feng Han Jie Zhong School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina department of Alternative Energy PetroChina Research Institute of Petroleum Exploration&DevelopmentLangfang 065007HebeiChina

Natural gas hydrate(NGH)can cause pipeline blockages during the transportation of oil and gas under high pressures and low *** hydrate adhesion on pipelines is viewed as an efficient way to prevent NGH *** studies suggested the water film can greatly increase hydrate adhesion in gas-dominant ***,by performing the molecular dynamics simulations,we find in water-dominant system,the water film plays different roles in hydrate deposition on Fe and its corrosion ***,due to the strong affinity of water on Fe surface,the deposited hydrate cannot convert the adsorbed water into hydrate,thus,a water film *** water affinities decrease(Fe>Fe_(2)O_(3)>FeO>Fe_(3)O_(4)),adsorbed water would convert to amorphous hydrate on Fe_(2)O_(3)and form the ordered hydrate on FeO and Fe_(3)O_(4)after hydrate *** absorbed water film converts to amorphous or to hydrate,the adhesion strength of hydrate continuously increases(Fe

关键词： Deposition Natural gas hydrate Pipelines Water affinity Adhesion strength

CD3ε of a pan T cell marker involved in mouse Aspergillus fumigatus keratitis

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2024年第4期17卷 616-624页

作者： Wen-Hao Shi Li-Mei Wang hai-Jing Yan Shi-Long Liu Xian Yang Xue-JiaoYang Cheng-Ye Che department of Ophthalmology the Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina Weifang Medical university Weifang 261053Shandong ProvinceChina Eye Hospital of Wenzhou Medical university Wenzhou 325027Zhejiang ProvinceChina department of Medical Engineering the Affiliated Hospital of Qingdao UniversityQingdao 266000Shandong ProvinceChina

AIM:To explore whether CD3ε is involved in the adaptive immunity of Aspergillus fumigatus(***)keratitis in mice and the role of innate and adaptive immunity in ***:Mice models of *** keratitis were established by intra-stromal injection and corneal epithelial *** injections of natamycin,wedelolactone,LOX-1 inhibitor(poly I)or Dectin-1 inhibitor(laminarin)were used to treat mice with *** *** were pretreated by intraperitoneal injection of anti-mouse CD3ε.We observed the corneal infection of mice under the slit lamp microscope and made a clinical *** protein expression of CD3ε and interleukin-10(IL-10)was determined by Western ***:With the disease progresses,the degree of corneal opacity and edema *** the intrastromal injection models,CD3εprotein expression began to increase significantly on the 2^(nd) ***,in the scraping epithelial method models,CD3ε only began to increase on the 3^(rd) *** natamycin treatment,the degree of corneal inflammation in mice was significantly attenuated on the 3^(rd) *** wedelolactone treatment,the severity of keratitis *** the amount of CD3ε protein was also reduced,compared with the control *** inhibiting LOX-1 and Dectin-1,there was no significant difference in CD3ε production compared with the control *** inhibiting CD3ε,corneal ulcer area and clinical score increased,and IL-10 expression was ***:As a pan T cell marker,CD3ε participate in the adaptive immunity of *** keratitis in *** our mice models,the corneas will enter the adaptive immune stage *** regulating IL-10,CD3ε exerts antiinflammatory and repairs effects in the adaptive immune stage.

关键词： CD3ε adaptive immunity Aspergillus fumigatus keratitis interleukin-10

Phase modulation of nickel-tin alloys in regulating electrocatalytic nitrogen reduction properties

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

Rare Metals 2024年第6期43卷 2851-2858页

作者： Lin Wang Hang-Ning Liu Xin Meng Chang-Hui Sun hai-Dong Liu Liang-Yu Gong Zhen-Hua Yan Jie Wang College of Chemistry and Pharmaceutical Sciences Qingdao Agricultural UniversityQingdao 266109China department of Chemistry-Angstrom Laboratory Uppsala University75121UppsalaSweden Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

Electrocatalytic nitrogen reduction reaction(NRR)is one of the attractive methods for ammonia(NH_(3))production at ambient conditions,but the catalytic performance largely depends on the physical properties of the ***,Ni-Sn alloy nanoparticles with well-controlled physical properties have been synthesized via a simple two-step method,which are applied as efficient electrocatalysts for the NRR.

关键词： alloys alloy nickel

Mechanisms of tigecycline resistance in Gram-negative bacteria:A narrative review

在线全文

学校读者我要写书评

暂无评论

Engineering Microbiology 2024年第3期4卷 54-61页

作者： Wenya Su Wenjia Wang Ling Li Mengge Zhang hai Xu Chengzhang Fu Xiuhua Pang Mingyu Wang State Key Laboratory of Microbial Technology Microbial Technology InstituteShandong UniversityQingdao 266237PR China Helmholtz Institute for Pharmaceutical Research Saarland(HIPS) Helmholtz Centre for Infection Research(HZI)and Department of PharmacySaarland UniversitySaarbrücken 66123Germany

Tigecycline serves as a critical“final-resort”antibiotic for treating bacterial infections caused by multidrug-resistant bacteria for which treatment options are severely *** increasing prevalence of tigecycline resistance,particularly among Gram-negative bacteria,is a major *** mechanisms have been iden-tified as contributors to tigecycline resistance,including upregulation of nonspecific Resistance Nodulation Divi-sion(RND)efflux pumps due to mutations in transcriptional regulators,enzymatic modification of tigecycline by monooxygenase enzymes,and mutations affecting tigecycline binding *** review aims to consolidate our understanding of tigecycline resistance mechanisms in Gram-negative bacteria and offer insights and perspectives for further drug development.

关键词： Gram-negative bacteria Tigecycline Tigecycline resistance Resistance mechanisms RND efflux pump

Changes in the Non-targeted Metabolomic Profile of Three-year-old Toddlers with Elevated Exposure to Polycyclic Aromatic Hydrocarbons

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

Biomedical and Environmental Sciences 2024年第5期37卷 479-493页

作者： LI Yang LIN Dan ZHANG Xiu Qin JU Guang Xiu SU Ya ZHANG Qian DUAN hai Ping YU Wei Sen WANG Bing Ling PANG Shu Tao department of Epidemiology and Health Statistics School of Public HealthQingdao UniversityQingdao 266021ShandongChina department of Environmental Health Qingdao Municipal Center for Disease Control and PreventionQingdao Institute of Preventive MedicineQingdao 266033ShandongChina Physicochemical Laboratory Qingdao Municipal Center for Disease Control and PreventionQingdao Institute of Preventive MedicineQingdao 266033ShandongChina Section of Child Health Care Huangdao Maternity and Child Health Care Hospital of QingdaoQingdao 266499ShandongChina qingdao Blood Center Qingdao 266071ShandongChina

Objective To investigate changes in the urinary metabolite profiles of children exposed to polycyclic aromatic hydrocarbons(PAHs)during critical brain development and explore their potential link with the intestinal *** Liquid chromatography-tandem mass spectrometry was used to determine ten hydroxyl metabolites of PAHs(OH-PAHs)in 36-month-old ***,37 children were categorized into low-and high-exposure groups based on the sum of the ten ***-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry was used to identify non-targeted metabolites in the urine ***,fecal flora abundance was assessed by 16S rRNA gene sequencing using Illumina *** The concentrations of 21 metabolites were significantly higher in the high exposure group than in the low exposure group(variable importance for projection>1,P<0.05).Most of these metabolites were positively correlated with the hydroxyl metabolites of naphthalene,fluorine,and phenanthrene(r=0.336–0.531).The identified differential metabolites primarily belonged to pathways associated with inflammation or proinflammatory states,including amino acid,lipid,and nucleotide ***,these distinct metabolites were significantly associated with specific intestinal flora abundances(r=0.34–0.55),which were mainly involved in *** Higher PAH exposure in young children affected metabolic homeostasis,particularly that of certain gut microbiota-derived *** investigation is needed to explore the potential influence of PAHs on the gut microbiota and their possible association with neurodevelopmental outcomes.

关键词： Child Gut microbiota Non-targeted metabolomics Polycyclic aromatic hydrocarbons Urinary metabolite profile