检索结果-南通市图书馆

Calculation of Differential Cross-Section of Elastic and 4^(1)S -4^(1)P Excitation of Calcium by Electron Impact

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 Letters 1998年第12期15卷 877-879页

作者： ZHOU Ya-jun ZHONG Zheng HE Xun pan shou-fu Institute of Atomic and Molecular Physics and National Laboratory of Theoretical and Computational ChemistryJilin UniversityChangchun 130023 Department of Physics Jilin Normal CollegeJilin 132000

Differential cross-sections of elastic and 4^(1)S-4^(1)P excitation for electron scattering by calcium at intermediate energies have been calculated and compared with *** method used is the momentum space coupled channels optical method with the complex equivalent-local polarization potentials,which takes all channels into *** channels are included in a coupled equation and the optical potential is added that describes effects of target continuum.

关键词： experiment. Elastic Electron

Calculation of Elastic Differential Cross Sections for Electron Scattering by Molecular Hydrogen

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 Letters 2001年第1期18卷 36-38页

作者： XIE Ting-Xian ZHOU Ya-Jun pan shou-fu YU Jun-Hua Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130023 Tunable Laser Technology National Key Laboratory Harbin Institute of TechnologyHarbin 150001

Differential cross sections for the elastic scattering of electrons by H2 at 100 eV and 150 eV have been calculated and compared with *** use the momentum space method in which the electron-molecule system has a single centre and the interaction of electron-nuclei is expanded by a multipole *** static exchange calculation is supplemented by a phenomenological polarization ***-molecule scattering is reduced to an electronic problem by the Born--Oppenheimer approximation,using closure over the vibrational and rotational states.

关键词： potential. Electron Elastic

Variability of Multiphoton Detachment Rate Versus Laser Intensity

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 Letters 1996年第5期13卷 355-358页

作者： WANG Bing-bing ZHU Qi-ren pan shou-fu Institute of Atomic and Molecular Physics Jilin University.Changchun 130023

With the help of a model calculation based on the R-matrix-Floquet theory,the variability of multiphoton detachment rate versus laser intensity is in detail investigated.A number of interesting regularities,which can ... 详细信息

关键词： perturbation theory lowest

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电子碰撞分子的R-矩阵研究

原子与分子物理学报 2007年第2期24卷 237-239页

作者：闫冰潘守甫吉林大学原子与分子物理研究所长春130012

采用R-矩阵方法首次研究了电子碰撞激发S3分子过程.S3分子靶态采用24个电子态密耦合表示,计算了电子碰撞由基态1A1平衡位置垂直激发到电子激发态13B2,13B1,13A2,11A2和11B1的积分散射截面.

关键词： S3 R-矩阵方法散射截面

Link between childhood obesity and gut microbiota

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第30期30卷 3560-3563页

作者： Yan pan fu-Yong Jiao Department of Pediatrics The First Affiliated Hospital of Yangtze UniversityJingzho 434000Hubei ProvinceChina Shaanxi Kawasaki Disease Diagnosis and Treatment Center Children's HospitalShaanxi Provincial People's Hospital of Xi'anJiaotong UniversityXi'an 710000Shaanxi ProvinceChina

Childhood obesity is a critical global health concern with rising prevalence and significant long-term health *** studies have implicated gut microbiota in the development and progression of *** editorial analyzes the research conducted by Li et al,who utilized 16S rRNA gene sequencing to compare the gut microbiome of overweight and healthy-weight *** study found significant differences in microbial diversity and composition between the two groups,with potential implications for understanding and managing childhood *** analyzed the study’s advantages and drawbacks,proposing potential areas for future research to better understand the connection between gut microbiota and obesity.

关键词： 16S rRNA Childhood obesity Gut microbiota future research Global health

Degradation behaviors of Nabumetone and its metabolite during UV/monochloramine process:Experimental and theoretical study

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 Environmental Sciences 2024年第8期142卷 103-114页

作者： Xiang Tu Yunsong Bai Qing fu Sheng Chang Kunfeng Zhang Yang pan Ruiyang Xiao Yifu fu Qi Zhang State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Drinking Water Source ProtectionResearch Centre of Lake EnvironmentNational Engineering Laboratory for Lake Pollution Control and Ecological RestorationChinese Research Academy of Environmental SciencesBeijing 100012China School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Institute of Environmental Engineering School of Metallurgy and EnvironmentCentral South UniversityChangsha 410083China School of Forestry Northeast Forestry UniversityHarbin 150040China

This study investigated degradation behaviors of a nonsteroidal anti-inflammatory drug Nabumetone(NMT)and its major metabolite 6-methoxy-2-naphthylacetic acid(MNA)in the coupling process of ultraviolet and monochloramine(UV/NH2Cl).The second-order rate constants of the contaminants reacting with reactive radicals(HO·,Cl·,Cl_(2)·-,and CO_(3)·^(-))were determined by laser flash photolysis ***·and Cl·contributed predominantly with 52.3%and 21.7%for NMT degradation and 60.8%and 22.3%for MNA *** presence of chlorides retarded the degradation of NMT,while promoted the destruction of MNA,which was ascribed to the photosensitization effects of MNA under UV *** functional theory(DFT)calculations revealed that radical adduct formation(RAF)was dominant pathway for both HO·and Cl·reacting with the contaminants,and hydrogen atom transfer(HAT)preferred to occur on side chains of NMT and *** reacted with NO_(2)·through single electron transfer(SET)with the second-order rate constant calculated to be 5.35×10^(7)(mol/L)^(-1)sec^(-1),and the contribution of NO_(2)·was predicted to be 13.0%of the total rate constant of NMT in pure water,which indicated that NO_(2)·played a nonnegligible role in the degradation of *** acute toxicity and developmental toxicity of NMT were enhanced after UV/NH_(2)Cl treatment,while those of MNA were *** transformation products of both NMT and MNA exhibited higher mutagenicity than their parent *** study provides a deep understanding of the mechanism of radical degradation of NMT and MNA in the treatment of UV/NH2Cl.

关键词： UV/NH_(2)Cl Reactive species Degradation kinetics Reaction mechanism Degradation products

The degradation pathways of contaminants by reactive oxygen species generated in the Fenton/Fenton-like systems

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第10期35卷 158-169页

作者： Chi Zhang Ning Ding Yuwei pan Lichun fu Ying Zhang Tianjin Key Laboratory of Environmental Technology for Complex Trans-Media Pollution College of Environmental Science and EngineeringNankai UniversityTianjin300350China Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business University.Beijing100048China College of Biology and the Environment Nanjing Forestry UniversityNanjing 210037China School of Iron and Steel Soochow UniversitySuzhou 205000China Key Laboratory of Pollution Process and Environmental Criteria Ministry of EducationCollege of Environmental Science and EngineeringNankai UniversityTianjin300350China

Reactive oxygen species(ROSs)in Fenton process are of great importance in treating contaminants in *** is crucial to understand their chemical properties,formation,and reaction mechanisms with *** review summarizes the reactive oxygen species in Fenton process,including hydroxyl radical(·OH),superoxide radical(O_(2)·-),singlet oxygen(1O_(2)),hydroperoxyl radical(HO_(2)·),and high-valent iron.·OH shows a trend to react with chemistry groups with abundant electrons through H-atom abstraction,radical adduct formation and single electron *** transfer is discovered to be an important pathway when1O_(2)degrades organic ***-opening andβ-scission are proposed to be the possible ways of1O_(2)to certain *** abstraction,nucleophilic substitution,and single electron transfer are proposed to explain how O_(2)·-degrade *** the conjugated acid of O_(2)·-,radical adduct formation and H-atom abstraction are reported for the reaction mechanisms of hydroperoxyl ***-valent iron in Fenton,namely Fe(IV),reacts with certain pollutants via single-or two-electron *** review is important for researchers to understand the ROSs produced in Fenton and how they react with pollutants.

关键词： Fenton Hydroxyl radical Superoxide radical Singlet oxygen Hydroperoxyl radical High-valent iron

Role of Oncostatin M in the prognosis of inflammatory bowel disease: A meta-analysis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第1期16卷 228-238页

作者： Yue Yang Kan-Zuo fu Gu pan Department of Gastroenterology III Heilongjiang Provincial HospitalHarbin 150036Heilongjiang ProvinceChina Department of Nursing The Second Hospital of HarbinHarbin 150056Heilongjiang ProvinceChina

BACKGROUND Oncostatin M(OSM)is a pleiotropic cytokine which is implicated in the path-ogenesis of inflammatory bowel disease(IBD).AIM To evaluate the prognostic role of OSM in IBD *** Literature search was conducted in electronic databases(Google Scholar,Embase,PubMed,Science Direct,Springer,and Wiley).Studies were selected if they reported prognostic information about OSM in IBD *** data were synthesized,and meta-analyses were performed to estimate standardized mean differences(SMDs)in OSM levels between treatment responders and non-res-ponders and to seek overall correlations of OSM with other inflammatory *** Sixteen studies(818 Crohn’s disease and 686 ulcerative colitis patients treated with anti-tumor necrosis factor-based therapies)were *** levels were associated with IBD severity.A meta-analysis found significantly higher OSM levels in non-responders than in responders to therapy[SMD 0.80(0.33,1.27);P=0.001],in non-remitters than in remitters[SMD 0.75(95%CI:0.35 to 1.16);P<0.0001]and in patients with no mucosal healing than in those with mucosal heal-ing[SMD 0.63(0.30,0.95);P<0.0001].Area under receiver operator curve values showed considerable variability between studies but in general higher OSM levels were associated with poor *** had significant correlations with Simple Endoscopic Score of Crohn’s disease[r=0.47(95%CI:0.25 to 0.64);P<0.0001],Mayo Endoscopic Score[r=0.35(95%CI:0.28 to 0.41);P<0.0001],fecal calprotectin[r=0.19(95%CI:0.08 to 0.3);P=0.001],C-reactive protein[r=0.25(95%CI:0.11 to 0.39);P<0.0001],and platelet count[r=0.28(95%CI:0.17 to 0.39);P<0.0001].CONCLUSION OSM is a potential candidate for determining the severity of disease and predicting the outcomes of anti-tumor necrosis factor-based therapies in IBD patients.

关键词： Inflammatory bowel disease Crohn’s disease Ulcerative colitis Oncostatin M Prognosis

First-principles study on the heterogeneous formation of environmentally persistent free radicals(EPFRs)overα-Fe2O3(0001)surface:Effect of oxygen vacancy

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 Environmental Sciences 2024年第8期142卷 279-289页

作者： Wenxiao pan Shuming He Qiao Xue Xian Liu Jianjie fu Kang Xiao Aiqian Zhang State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environment Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310012China College of Resources and Environment University of Chinese Academy of SciencesBeijing 100049China Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of SciencesBeijing 101408China

Metal oxides with oxygen vacancies have a significant impact on catalytic activity for the transformation of organic pollutants in waste-to-energy(WtE)incineration *** study aims to investigate the influence of hematite surface oxygen point defects on the formation of environmentally persistent free radicals(EPFRs)from phenolic compounds based on the first-principles *** oxygen-deficient conditions were considered:oxygen vacancies at the top surface and on the *** simulations indicate that the adsorption strength of phenol on theα-Fe_(2)O_(3)(0001)surface is enhanced by the presence of oxygen ***,the presence of oxygen vacancies has a negative impact on the dissociation of the phenol molecule,particularly for the surface with a defective point at the top ***-kinetic parameters were established over a temperature range of300-1000 K,and lower reaction rate constants were observed for the scission of phenolic O-H bonds over the oxygen-deficient surfaces compared to the pristine *** negative effects caused by the oxygen-deficient conditions could be attributed to the local reduction of FeⅢto FeⅡ,which lower the oxidizing ability of surface reaction *** findings of this study provide us a promising approach to regulate the formation of EPFRs.

关键词： EPFR formation Phenol dissociation Oxygen-vacancy impact Hematite surface First-principles calculation