检索结果-南通市图书馆

High-resolution remote thermometry based on Bi^(3+)-doped 0D zinc halide hybrids

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第8期67卷 2599-2605页

作者： Cui-Mi Shi shu-Hua Xue Jin-Yun Wang Liang-Jin Xu Zhong-ning Chen State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Fujian Science Technology Innovation Laboratory for Optoelectronic Information of ChinaFuzhou 350108China University of Chinese Academy of Sciences Beijing 100049China

Developing highly sensitive optical thermometers is of great significance due to their capability to enable remote and non-contact temperature measurements, rendering them highly applicable in diverse and harsh environments. Herein we report a temperature-dependent phosphor of 0D metal halide hybrid by incorporating Bi^(3+)into the(MePPh_(3))_(2.ZnCl_(4) matrix. Through Bi^(3+)doping,the initially non-luminescent(MePPh_(3))_(2. ZnCl_(4) matrix exhibits a deep-blue emission centered at 453 nm, with a photoluminescence quantum yield(PLQY) of 5.71% and a Stokes shift of 75 nm at room temperature. Experimental characterization demonstrates that exciton-like luminescence of Bi^(3+)is mainly responsible for the blue emission. Single crystals of Bi^(3+)-doped(MePPh_(3))_(2.ZnCl_(4) show an unusual correlation between photoluminescence(PL) lifetime and temperature. Particularly, the dependence of luminescence lifetime on temperature is most remarkable in the temperature range of 80 to 100 K with an exceptional sensitivity up to 0.09 K^(-1), representing one of the best levels for thermometry based on PL decay lifetime. Our work not only provides a viable strategy for designing a novel, environmentally friendly, and stable blue emitter, but also paves the way for precise thermometric application at low temperature.

关键词： lead-free hybrids Bi^(3+)doping blue emission temperature sensing

Stereoselective Self-Assembly of Chiral Metalla[2.Catenanes and Lemniscular Macrocycles

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2024年第8期6卷 2000-2010页

作者： shu-Jin Bao Hai-ning Zhang Guo-Xin Jin Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of PolymersDepartment of ChemistryFudan UniversityShanghai 200433

Designing and stereoselectively constructing chiral mechanically interlocked molecules(MIMs)is a goal that many chemists are pursuing due to their potential in the development of functional molecular machines involved in catalysis,sensing,and chiroptical ***,the synthesis of enantiopure supramolecular entities with crystallographic structures remains ***,the stereoselective self-assembly of chiral metalla[2.catenanes interlocked by two D-shaped macrocycles was realized by combining long binuclear half-sandwich organometallic Cp*Rh^(III)(Cp*=η^(5)-pentamethylcyclopentadienyl)clip and ditopic monodentate ligand incorporating L-leucine *** resulting metalla[2.catenane displayed unique co-conformational mechanical helical chirality characteristics arising from the chirality transfer of the chiral ***,decreasing the length of the binuclear Cp*Rh^(III)clip and adjusting the steric hindrance of the amino-acid side chains(L-alanine and L-phenylalanine)in the ligands resulted in two lemniscular macrocycles with left-handed(M)-twisted conformational *** the best of our knowledge,the synthesized macrocycles are the first family of homochiral abnormal lemniscate-shaped organometallic macrocycles featuring figure-eight ***[2.catenanes and macrocycles with opposite chirality were also generated by employing corresponding D-amino acid ligands,as evidenced by single-crystal X-ray diffraction,nuclear magnetic resonance,mass,and circular dichroism *** present study demonstrates that homochiral MIMs can be accessed readily using amino acid–containing ligands through rational molecular design.

关键词： stereoselective synthesis chirality metallacatenanes twisted macrocycles aminoacid residues

Rate and Change in Household Solid Fuels Usage Among Residents Aged 40 and Older — China, from 2.14–2.15 to 2.19–2.2.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China CDC weekly 2024年第43期6卷 1111-1119,I0001,I0002页

作者： Wenjing Wang shu Cong Jing Fan ning Wang Qian Wang Liwen Fang National Center for Chronic and Non-communicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijingChina National Center for Women and Children’s Health Chinese Center for Disease Control and PreventionBeijingChina.

Introduction:Solid fuel combustion is a significant source of household air pollution and an important risk factor for chronic obstructive pulmonary disease(COPD).This study presents the rates and change in the use of solid fuels for cooking and heating in ***:Based on data from the Chinese Chronic Obstructive Pulmonary Disease Surveillance,the research estimated the rates and change of solid fuels usage for cooking and heating from 2.14–2.15 to 2.19–2.2. and the rate of primary cooking solid fuels usage in 2.19–2.2.,and analyzed the association between solid fuels usage and ***:The rates of solid fuels usage for cooking and heating significantly decreased,dropping from 45.3%to 2..0%and from 33.5%to 2..2.,*** rates were higher among rural residents,with 47.2.using it for cooking and 37.7%for heating in *** usage of solid fuels for cooking is associated with increased risk of *** rural residents,combined usage of biomass and coal for cooking(OR=1.2.,95%CI:1.12.1.48)and using coal as primary fuel for cooking(OR=1.18,95%CI:1.00,1.38)are associated with higher risk of *** usage of biomass for cooking is associated with an increased risk of COPD in urban residents(OR=1.17,95%CI:1.03,1.32..Conclusions:The study demonstrates a significant decline in the use of household solid ***,high utilization rates persist among individuals in rural settings and those from lower socioeconomic *** is of great public health importance to propose targeted fuel substitution measures for various solid fuels in different regions to reduce the risk of COPD.

关键词： cooking Solid usage

Simultaneous Bulk-and Surface-initiated Living Polymerization Studied with a Heterogeneous Stochastic Reaction Model

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 Journal of Polymer Science 2024年第3期42卷 364-372,I0008页

作者： Jia-shu Ma Zhi-ning Huang Jia-Hao Li Bang-Ping Jiang Yan-Da Liao Shi-Chen Ji Xing-Can Shen State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources(Ministry of Education of China)School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004China School of Computer Science and Engineering&School of Software Guangxi Normal UniversityGuilin 541004China

To better characterize the properties of surface-initiated polymers, simultaneous bulk-and surface-initiated polymerizations are usually carried out by assuming that the properties of the surface-initiated polymers resemble those of the bulk-initiated polymers. Through a Monte Carlo simulation using a heterogeneous stochastic reaction model, it was discovered that the bulk-initiated polymers exhibit a higher molecular weight and a lower dispersity than the corresponding surface-initiated polymers, which indicates that the equivalent assumption is invalid. Furthermore, the molecular weight distributions of the two types of polymers are also different, suggesting different polymerization mechanisms. The results can be simply explained by the heterogeneous distributions of reactants in the system. This study is helpful to better understand surface-initiated polymerization.

关键词： Surface-initiated polymerization Polymer brush Stochastic reaction model Heterogeneous polymerization Simultaneous polymerization

The IDD Transcription Factors:Their Functions in Plant Development and Environmental Response

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第1期93卷 63-79页

作者： Jing Liu Defeng shu Zilong Tan Mei Ma Huanhuan Yang ning Guo Shipeng Li Dayong Cui School of Life Sciences Qilu Normal UniversityJinan250200China School of Life Sciences Shandong Normal UniversityJinan250014China

INDETERMINATE-DOMAIN proteins(IDDs)are a plant-specific transcription factor family characterized by a conserved ID domain with four zinc finger *** studies have demonstrated that IDDs coordinate a diversity of physiological processes and functions in plant growth and development,including floral transition,plant architecture,seed and root development,and hormone *** this review,we especially summarized the latest knowledge on the functions and working models of IDD members in Arabidopsis,rice,and maize,particularly focusing on their role in the regulatory network of biotic and abiotic environmental responses,such as gravity,temperature,water,and *** these mechanisms underlying the function of IDD proteins in these processes is important for improving crop yields by manipulating their ***,the review offers valuable insights into the functions and mechanisms of IDD proteins in plants,providing a foundation for further research and potential applications in agriculture.

关键词： INDETERMINATE DOMAIN flowering time root development shoot gravitropism plant immunity hormonal signaling environmental responses

Altered oceanic crust source for the alkaline rocks with superchondritic Nb/Ta ratios due to the steep subduction

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 Earth Science 2024年

作者： Xu Zhao ning-Bo Li He-Cai Niu shu-Cheng Tan Department of Geology， School of Earth Sciences， Yunnan University CAS Key Laboratory of Mineralogy and Metallogeny， Guangzhou Institute of Geochemistry， Chinese Academy of Sciences CAS Center for Excellence in Deep Earth Science

The cause resulting in alkaline rocks with superchondritic Nb/Ta ratios remains a geochemical enigma. This paper present zircon and apatite geochronology， mineralogy， geochemistry， and Nd-Hf-Zn isotope investigation on the Ejinao nepheline syenite from South China to constrain the petrogenesis of alkaline rocks. The occurrence of alkaline minerals， including alkaline feldspar， arfvedsonite， and nepheline， indicate an alkaline feature of the Ejinao nepheline syenite. Zircon and apatite from the rock show U-Pb concordia age of 135.4±0.9 Ma and 137.5±5.8Ma， respectively， suggesting generation in the Early Cretaceous. The rock is characterized by low MgO （0.17 wt.%–0.2. wt.%） contents， but high Fe2.3T（4.66 wt.%–6.16 wt.%） and total alkalis (Na2. + K2. = 12.1 wt.%–13.1 wt.%) contents， consistent with the melts from subducting oceanic crust rather than mantle peridotite. The rock has low TiO2.0.13 wt.%–0.2. wt.%） contents and superchondritic Nb/Ta and Zr/Hf ratios， resulting from rutile residue in the source area. The εNd（t）（-1.35 to -1.09）， εHf（t）（-3.03 to -1.52.， and δ66Zn （0.32. to 0.34‰） values of the nepheline syenite manifest the involvement of 15%–2.% carbonate-bearing sediments in the altered oceanic crust. Geochemical modeling further reveals that the nepheline syenite was sourced from 10%–2.% melting of such a source. This superchondritic Nb/Ta nepheline syenite was generated during the steep subduction of the Paleo-Pacific Ocean， which is needed to bring oceanic slab to a hot mantle and resulted in the altered oceanic crust melting. Our study highlights that the altered oceanic crust represents a novel source for superchondritic Nb/Ta alkaline rocks.

关键词：

Efficacy and safety of Yangxue Qingnao Granules in treatment of migraine:A systematic review and meta-analysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第2期12卷 335-345页

作者： Bo Zhou Gui-shu Wang Yu-ning Yao Tong Hao Huan-Qin Li Ke-Gang Cao Department of Neurology Xiyuan HospitalChina Academy of Chinese Medical SciencesBeijing 100091China Department of Infectious Disease Dongfang HospitalBeijing University of Chinese MedicineBeijing 100078China Institute for Brain Disorders Beijing University of Chinese MedicineBeijing 100700China Department of Acupuncture and Moxibustion Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical UniversityBeijing 100010China

BACKGROUND Yangxue Qingnao Granules(YXQN)is a Chinese patent medicine that has been commonly used in the clinical treatment of *** To assess the efficacy and safety of YXQN alone for the treatment of *** We searched 10 databases to identify relevant randomized controlled trials(RCTs)published before September *** review authors independently searched and screened the literature,extracted the data,and assessed the methodological quality of the studies using criteria from ROB 2.0,and analyzed the data using Review Manager 5.4 *** A total of 12.RCTs including 767 participants with migraine met the selection *** divided these studies into comparisons of YXQN with placebo,routine treatment drugs,and other Chinese patent *** meta-analysis showed the following:(1)Efficacy:The YXQN group outperformed the placebo group[relative risk(RR)=0.2.,95%confidence interval(95%CI):0.15–0.43,P2.,P2.,95%CI:0.13–0.41,P2.frequency of headache:There was a significant difference between YXQN vs placebo[mean difference(MD)=-1.2.,95%CI:-1.60 to-0.90,P2.,95%CI:-0.89 to 0.46,P2.,95%CI:-1.70 to-0.77,P2.to 0.19,P=0.08),routine treatment drugs(MD=-0.53,95%CI:-2.02.to 0.96,P=0.68),and other Chinese patent medicines(MD=-0.49,95%CI:-2.83 to 1.85,P=0.68).Mild gastrointestinal adverse reactions were reported

关键词： Meta-analysis Migraine Yangxue Qingnao Granules Traditional Chinese patent medicine

Autonomous Recommendation of Fault Detection Algorithms for Spacecraft

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 273-275页

作者： Wenbo Li Baoling ning the National Key Laboratory of Science and Technology on Space Intelligent Control Beijing Institute of Control EngineeringBeijing 100094China the School of Data Science and Technology Heilongjiang UniversityHarbin 150001China

Dear Editor, This letter deals with the problem of algorithm recommendation for online fault detection of spacecraft. By transforming the time series data into distributions and introducing a distribution-aware measure, a principal method is designed for quantifying the detectabilities of fault detection algorithms over special datasets.

关键词： fault introducing letter

Performance enhancement of perovskite solar cells:surface is the key

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第1期67卷 375-376页

作者： Wenzhuo Li Zhijun ning School of Physical Science and Technology Shanghaitech UniversityShanghai 201210China

Metal halide perovskite solar cells(PSCs)stand out as one of the most promising contenders among photovoltaic technologies for the *** the past decade,PSCs with high power conversion efficiency(PCE)predominantly adopted the normal(ni-p)device ***,a common p-type organic small molecule,Spiro-OMe TAD,which is widely employed at the top layer of n-i-p devices[1],faces issues such as susceptibility to water absorption and poor thermal stability.

关键词： structure stability perovskite