检索结果-南通市图书馆

Synthesis and characterization of three new solid polyoxometalates based on Wells-Dawson-derived sandwich-type polyanions [Co_(4)(H_(2)O)_(2)(P_(2)W_(15)O_(56))_(2)]^(16-)

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第3期25卷 268-274页

作者： Jjijie YE xuan XU Chuande wu Department of Chemistry Zhejiang UniversityHangzhou 310058China

Three polyoxometalate-based hybrid coordination materials,[Co_(8)(H_(2)O)_(34)(pz)_(2){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·16H_(2)O(compound 1),[H_(3)O]_(4)[Co_(6)(H_(2)O)_(22)(pz)_(2){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·21H_(2)(compound 2),and[H_(3)O]_(4)[Co_(6)(H_(2)O)_(22){Co_(4)(H_(2)O)_(2)P_(4)W_(30)O_(112)}]·29H_(2)O(compound 3)(pz-pyrazine),were built from the linkage of[Co_(4)(H_(2)O)_(2)(P_(2)W_(15)O_(56)_(2)]^(16-)-(abbreviated as{Co_(4)P_(4)W_(30})polyanions and pz and/or cobalt(II)*** compounds 1 and 2 consisted of the same components,their lamellar networks were quite *** inorganic lamellar network in compound 3 was constructed by connecting{Co_(4)P_(4)W_(30)}units with cobalt(I)*** work demonstrates that the coordination modes of{Co_(4)P_(4)W_(30)}are very sensitive to synthesis conditions,while the ring-belt tetrametals are easily substituted by different transition metal cations under mild reaction conditions.

关键词： Cobalt Crystal structure Cyclic voltammetry Hybrid Polyoxometalate

Conductivity characteristics of landslide considering porosity,saturation,temperature and ion concentration

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 Mountain Science 2023年第8期20卷 2133-2148页

作者： XIONG Bo-bo YANG Shi-jie ZHAO Bing-qin LU Xiao-chun TIAN Bin LI Cheng wu xuan-xuan TU Xiao-long College of Hydraulic and Environmental Engineering China Three Gorges UniversityYichang 443000China College of Civil Engineering and Architecture China Three Gorges UniversityYichang 443000China Hubei Energy Group Luotian Pingtanyuan Pumped Storage Co. Ltd.Huanggang 438000China

High-density resistivity imaging method is widely used in landslide *** resistivity of rock and soil is closely related to factors,such as porosity,moisture content,saturation and *** this study,the resistivity test was designed to investigate the influence of physical factors and pore solution components on the resistivity of landslide *** and analytical results find that both moisture content and volumetric water content varies greatly under the same *** different temperatures,soil resistivity exhibits great *** the same temperature,the ion concentration and species in pore solutions have great influence on soil *** on the test results and grey correlation analysis,this study established a resistivity model by considering porosity,saturation,temperature and ion *** study lays a foundation for the high-density resistivity method to measure the moisture content of landslides.

关键词： Landslide monitoring High-density resistivity method Pore fluid composition Resistivity model

mRNA vaccine technology for infectious diseases and beyond

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2024年第10期67卷 2267-2270页

作者： Pei Hao Xiao Li xuan Li wu Zhong Key Laboratory of Molecular Virology and Immunology Shanghai Institute of Immunity and InfectionChinese Academy of SciencesShanghai 200031China Changchun Veterinary Research Institute Chinese Academy of Agricultural SciencesChangchun 130122China Key Laboratory of Synthetic Biology CAS Center for Excellence in Molecular Plant SciencesInstitute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032China National Engineering Research Center for the Emergency Drug Beijing Institute of Pharmacology and ToxicologyBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

The rise of mRNA vaccine technology Vaccines stand as one of the most significant medical advancements,playing a crucial role in the prevention of infectious diseases and the improvement of global *** triumph of smallpox vaccination stands as a towering achievement in the annals of healthcare,leading to the complete elimination of a oncedevastating disease and showcasing the efficacy of vaccination methods.

关键词： methods vaccination prevention

Synthesis and Modulation of Low-Dimensional Transition Metal Chalcogenide Materials via Atomic Substitution

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第9期16卷 49-94页

作者： xuan Wang Akang Chen XinLei wu Jiatao Zhang Jichen Dong Leining Zhang Key Laboratory of Cluster Science Ministry of Education of ChinaBeijing Key Laboratory of Photoelectronic and Electrophonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081People’s Republic of China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of Chemistry Chinese Academy of SciencesBeijing 100190People’s Republic of China

In recent years,low-dimensional transition metal chalcogenide(TMC)materials have garnered growing research attention due to their superior electronic,optical,and catalytic properties compared to their bulk *** controllable synthesis and manipulation of these materials are crucial for tailoring their properties and unlocking their full potential in various *** this context,the atomic substitution method has emerged as a favorable *** involves the replacement of specific atoms within TMC structures with other elements and possesses the capability to regulate the compositions finely,crystal structures,and inherent properties of the resulting *** this review,we present a comprehensive overview on various strategies of atomic substitution employed in the synthesis of zero-dimensional,one-dimensional and two-dimensional TMC *** effects of substituting elements,substitution ratios,and substitution positions on the structures and morphologies of resulting material are *** enhanced electrocatalytic performance and photovoltaic properties of the obtained materials are also provided,emphasizing the role of atomic substitution in achieving these ***,challenges and future prospects in the field of atomic substitution for fabricating low-dimensional TMC materials are summarized.

关键词： Transition metal chalcogenides Atomic substitution Ion exchange Low-dimensional materials Controllable synthesis

Meta-analysis of the clinical efficacy of the Gamma3 nail vs Gamma3U-blade system in the treatment of intertrochanteric fractures

在线全文

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2024年第3期15卷 285-292页

作者： xuan wu Bo Gao Department of Orthopedic Zhong Da HospitalSchool of MedicineSoutheast UniversityNanjing 210000Jiangsu ProvinceChina Department of Orthopedic The Affiliated Taizhou Second People's Hospital of Yangzhou UniversityTaizhou 225500Jiangsu ProvinceChina

BACKGROUND The traditional Gamma3 nail is a mainstream treatment for femoral intertrochanteric *** reports that the Gamma3U-blade system can increase the stability of the Gamma3 nail and reduce complication ***,comparative studies between the Gamma3U-blade and Gamma3 systems are limited;hence,this meta-analysis was performed to explore the clinical efficacy of these two surgical *** To investigate the clinical efficacy of Gamma3 and Gamma3 U-blade for intertrochanteric *** A computerized search for Chinese and English literature published from 2010 to 2022 was conducted in PubMed,Cochrane,CNKI,Wanfang,and VIP *** search keywords were gamma 3,gamma 3 U blade,and intertrochanteric ***,literature tracking was performed on the references of published *** data were analyzed using Revman 5.3 *** individuals checked the inputs for *** variables were described using mean difference and standard deviation,and outcome effect sizes were expressed using ratio OR and 95%confidence interval(CI).High heterogeneity was considered at(P50%),moderate heterogeneity at I2 from 25%to 50%,and low heterogeneity at(P≥0.05,I2<50%).RESULTS Following a comprehensive literature search,review,and analysis,six articles were selected for inclusion in this *** selection comprised five articles in English and one in Chinese,with publication years spanning from 2016 to *** study with the largest sample size,conducted by Seungbae in 2021,included a total of 304 *** analysis:A total of 1063 patients were included in this *** main outcome indicators were:Surgical time:The Gamma3U blade system had a longer surgical time compared to Gamma3 nails(P=0.006,I2=76%).Tip-apex distance:No statistical significance or heterogeneity was observed(P=0.65,I2=0%).Harris Hip score:No statistical significance was found,and low heterogeneity was detected(P=0.

关键词： Gamma3 nail Gamma3U-Blade system Femoral intertrochanteric fractures Meta-analysis

Cellular senescence-driven transcriptional reprogramming of the MAFB/NOTCH3 axis activates the PI3K/AKT pathway and promotes osteosarcoma progression

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2024年第2期11卷 952-963页

作者： Zhenhao Zhang Doudou Jing Baijun xuan Zhicai Zhang Wei wu Zengwu Shao Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430022China Department of Orthopedics The Second Hospital of Shanxi Medical UniversityTaiyuanShanxi 030001China Department of Cardiology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanHubei 430022China

Osteosarcoma is the most common primary malignancy of bones and primarily occurs in adolescents and young ***,a second smaller peak of osteosarcoma incidence was reported in the elderly aged more than *** patients with osteosarcoma exhibit different characteristics compared to young patients,which usually results in a poor *** mechanism underlying osteosarcoma development in elderly patients is intriguing and of significant value in clinical *** cells can accelerate tumor progression by metabolic *** research has shown that methylmalonic acid(MMA)was significantly up-regulated in the serum of older individuals and played a central role in the development of aggressive *** found that the significant accumulation of MMA in elderly patients imparted proliferative potential to osteosarcoma *** expression of MAFB was excessively up-regulated in osteosarcoma specimens and was further enhanced in response to MMA accumulation as the patient ***,we first confirmed a novel molecular mechanism between cellular senescence and cancer,in which the MMA-driven transcriptional reprogramming of the MAFB-NOTCH3 axis accelerated osteosarcoma progression via the activation of PI3K-AKT ***,the down-regulation of the MAFB-NOTCH3 axis increased the sensitivity and effect of AKT inhibitors in osteosarcoma through significant inhibition of AKT *** conclusion,we confirmed that MAFB is a novel age-dependent biomarker for osteosarcoma,and targeting the MAFB-NOTCH3 axis in combination with AKT inhibition can serve as a novel therapeutic strategy for elderly patients with osteosarcoma in experimental and clinical trials.

关键词： Cellular senescence Elderly patients MAFB-NOTCH3axis Methylmalonic acid Osteosarcoma PI3K-AKTpathway

Elevation response of above-ground net primary productivity for Picea crassifolia to climate change in Qilian Mountains of Northwest China based on tree rings

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 Geographical Sciences 2024年第1期34卷 146-164页

作者： wu xuan JIAO Liang DU Dashi XUE Ruhong WEI Mengyuan ZHANG Peng College of Geography and Environment Science Northwest Normal UniversityLanzhou 730070China Key Laboratory of Resource Environment and Sustainable Development of Oasis Northwest Normal UniversityLanzhou 730070China

Current ecosystem models used to simulate global terrestrial carbon balance generally suggest that terrestrial landscapes are stable and mature,but terrestrial net primary productivity(NPP)data estimated without accounting for disturbances in species composition,environment,structure,and ecological characteristics will reduce the accuracy of the global carbon ***,the steady-state assumption and neglect of elevation-related changes in forest NPP is a *** Qilian Mountains are located in continental climate zone,and vegetation is highly sensitive to climate *** quantified aboveground biomass(AGB)and aboveground net primary productivity(ANPP)sequences at three elevations using field-collected tree rings of Picea crassifolia in Qilian Mountains of Northwest *** results showed that(1)There were significant differences between AGB and ANPP at the three elevations,and the growth rate of AGB was the highest at the low elevation(55.99 t ha^(–1)10a^(–1)).(2)There are differences in the response relationship between the ANPP and climate factors at the three elevations,and drought stress is the main climate signal affecting the change of ANPP.(3)Under the future climate scenario,drought stress intensifies,and the predicted decline trend of ANPP at the three elevations from mid-century to the end of this century is–0.025 t ha^(–1)10a^(–1),respectively;–0.022 t ha^(–1)10a^(–1);At–0.246 t ha^(–1)10a^(–1),the level of forest productivity was significantly *** results reveal the elevation gradient differences in forest productivity levels and provide key information for studying the carbon sink potential of boreal forests.

关键词： global climate change tree ring aboveground net primary productivity aboveground biomass drought stress Qilian Mountains

A metal-free coordination–insertion ring-opening polymerization of tetrahydrofuran by the central metalloid bis(pentafluorophenyl)(phenoxy)borane

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第3期35卷 419-422页

作者： Cheng wu Yixuan Liu Chunsheng Xiao Chenyang Hu xuan Pang Xuesi Chen Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China

A new strategy for the metal-free coordination–insertion ring-opening polymerization of tetrahydrofuran by the central metalloid Boron has been first ***(pentafluorophenyl)(phenoxy)borane was used as a catalyst for the polymerization reaction *** polytetrahydrofuran with high molecular weight and narrow molecular weight distribution could be *** proposed mechanism was studied by MALDI-TOF,ESI-MS and O-18 isotope labeling analyses as a metal-free coordination insertion mechanism.

关键词： Metal-free catalyst Bis(pentafluorophenyl)(phenoxy)borane Coordination–insertion mechanism Ring-opening polymerization Polytetrahydrofuran

SCIRD: Revealing Infection of Malicious Software in Edge Computing-Enabled IoT Networks

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第5期79卷 2743-2769页

作者： Jiehao Ye Wen Cheng Xiaolong Liu Wenyi Zhu xuan’ang wu Shigen Shen School of Information Engineering Huzhou UniversityHuzhou313000China

The Internet of Things(IoT)has characteristics such as node mobility,node heterogeneity,link heterogeneity,and topology *** the face of the IoT characteristics and the explosive growth of IoT nodes,which brings about large-scale data processing requirements,edge computing architecture has become an emerging network architecture to support IoT applications due to its ability to provide powerful computing capabilities and good service ***,the defense mechanism of Edge Computing-enabled IoT Nodes(ECIoTNs)is still weak due to their limited resources,so that they are susceptible to malicious software spread,which can compromise data confidentiality and network service *** this situation,we put forward an epidemiology-based susceptible-curb-infectious-removed-dead(SCIRD)***,we analyze the dynamics of ECIoTNs with different infection levels under different initial conditions to obtain the dynamic differential ***,we establish the presence of equilibrium states in the SCIRD ***,we conduct an analysis of the model’s stability and examine the conditions under which malicious software will either spread or disappear within Edge Computing-enabled IoT(ECIoT)***,we validate the efficacy and superiority of the SCIRD model through MATLAB *** research findings offer a theoretical foundation for suppressing the propagation of malicious software in ECIoT *** experimental results indicate that the theoretical SCIRD model has instructive significance,deeply revealing the principles of malicious software propagation in ECIoT *** study solves a challenging security problem of ECIoT networks by determining the malicious software propagation threshold,which lays the foundation for buildingmore secure and reliable ECIoT networks.

关键词： Edge computing Internet of Things malicious software propagation model heterogeneity