检索结果-南通市图书馆

Chinese Chemical Letters 2025年第2期36卷 400-405页

作者： Qinghong Zhang Qiao zhao Xiaodi Wu Li Wang Kairui Shen Yuchen Hua Cheng Gao Yu Zhang Mei Peng Kai zhao Institute of Advanced Synthesis School of Chemistry and Molecular EngineeringJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing Tech University College of Chemical Engineering Nanjing Forestry University College of Pharmacy Hengyang Medical SchoolUniversity of South China School of Chemistry and Chemical Engineering Henan Normal University

Pyridyl-based ketones and 1,6-diketones are both attractive and invaluable scaffolds which play pivotal roles in the construction and structural modification of a plethora of synthetically paramount natural products, pharmaceuticals, organic materials and fine chemicals. In this context, we herein demonstrate an unprecedented, robust and generally applicable synthetically strategy to deliver these two crucial ketone frameworks via visible-light-induced ring-opening coupling reactions of cycloalcohols with vinylazaarenes and enones, respectively. A plausible mechanism involves the selective β-C-C bond cleavage of cycloalcohols enabled by proton-coupled electron transfer and ensuing Giese-type addition followed by single electron reduction and protonation. The synthetic methodology exhibits broad substrate scope,excellent functional group compatibility as well as operational simplicity and environmental friendliness.

关键词： 1,6-Diketone C-C Bond cleavage Proton-coupled electron transfer Pyridyl-based ketone Ring-opening coupling

A Geometric Model Simplification Strategy for CFD Simulation of the Cockpit Internal Environment

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2025年第2期142卷 1545-1564页

作者： Meng zhao Jiaao Liu YudiLiu Zhengwei Long Tianjin Key Lab.of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin300072China Architectural Institute China Railway Design CorporationTianjin300308China Environmental Control Oxygen Department Shanghai Aircraft Design and Research InstituteCOMACShanghai201210China

Computational Fluids Dynamics(CFD)simulations are essential for optimizing the design of a cockpit’s internal environment,but the complex geometric models consume a significant amount of computational resources and *** simplification of geometric models may result in inaccurate calculations of physical *** address this issue,this study establishes a geometric model simplification strategy and successfully applies it to a *** implementation of the whole approach is divided into three steps,summarized in three methods,namely Sensitivity Analysis Method(SAM),Detail Suppression Method(DSM),and Evaluation Standards Method(ESM).Sensitivity analysis of the detailed features of the geometric model is performed using the adjoint *** details of the geometric model are suppressed based on the principle of curvature *** evaluation,the suppression degrees of detailed features with different sensitivity levels are *** results demonstrate that this strategy can be employed to achieve precise simplification standards,thereby avoiding excessive deviations caused by arbitrary simplification and reducing the significant costs associated with trial-and-error simplification.

关键词： CFD model simplification cockpit sensitivity analysis detail suppression

Resolving the developmental mechanisms of cardiac microthrombosis of SARS-CoV-2 based on single-cell transcriptome 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

Science China(Life Sciences) 2025年第1期68卷 103-115页

作者： Xizi Luo Nan Zhang Yuntao Liu Beibei Du Xuan Wang Tianxu zhao Bingqiang Liu Shishun zhao Jiazhang Qiu Guoqing Wang State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious Diseases Key Laboratory for Zoonosis Research of the Ministry of EducationCollege of Basic MedicineJilin UniversityChangchun 130012China College of Mathematics Jilin UniversityChangchun 130021China Department of Cardiology China-Japan Union HospitalJilin UniversityChangchun 130033China Bioinformatic Lab School of MathematicsShandong UniversityJinan 250100China State Key Laboratory for Diagnosis andTreatmentof Severe Zoonotic Infectious Diseases Key Laboratory for Zoonosis Research of the Ministryof EducationCollegeof Veterinary MedicineJilin UniversityChangchun 130062China

The coronavirus disease 2019(COVID-19)outbreak caused by the severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)developed into a global health *** microthrombus caused by SARS-CoV-2 infection is a common complication in patients with *** microthrombosis as a complication of SARS-CoV-2 infection is the primary cause of cardiac injury and death in patietns with severe *** this study,we performed single-cell sequencing analysis of the right ventricular free wall tissue from healthy donors,patients who died during the hypercoagulable period of characteristic coagulation abnormality(CAC),and patients who died during the fibrinolytic period of *** collected 61,187 cells enriched in 24 immune cell subsets and 13 cardiac-resident cell *** found that in the course of SARS-CoV-2 infected heart microthrombus,MYO1 Ehigh RASGEF1 Bhighmonocyte-derived macrophages promoted hyperactivation of the immune system and initiated the extrinsic coagulation pathway by activating chemokines CCL3,*** series of events is the main cause of cardiac microthrombi following SARS-CoV-2 *** a SARS-CoV-2 infected heart microthrombus,excessive immune activation is accompanied by an increase in cellular iron content,which in turn promotes oxidative stress and intensifies intercellular *** induces cells to alter their metabolic environment,resulting in increased sugar uptake via the glycosaminoglycan synthesis *** addition,high levels of reactive oxygen species generated by elevated iron levels promote increased endogenous malondialdehyde synthesis in a subpopulation of cardiac endothelial *** exacerbates endothelial cell dysfunction and exacerbates the coagulopathy process.

关键词： SARS-CoV-2 cardiac microthrombosis immune hyperactivation cell competition

Carbon Dots-Modified Hollow Mesoporous Photonic Crystal Materials for Sensitivityand Selectivity-Enhanced Sensing of Chloroform Vapor

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第4期17卷 381-398页

作者： Junchen Liu Ji Liu Zhipeng Li Liupeng zhao Tianshuang Wang Xu Yan Fangmeng Liu Xiaomin Li Qin Li Peng Sun Geyu Lu Dongyuan zhao State Laboratory On Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012People’s Republic of China Department of Chemistry and Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsState Key Laboratory of Molecular Engineering of PolymersCollaborative Innovation Center of Chemistry for Energy Materials(2011-iChEM)College of Chemistry and MaterialsFudan UniversityShanghaiPeople’s Republic of China School of Engineering and Built Environment Griffith UniversityNathanQLD 4111Australia

Chloroform and other volatile organic pollutants have garnered widespread attention from the public and researchers,because of their potential harm to the respiratory system,nervous system,skin,and ***,research on chloroform vapor sensing is still in its early stages,primarily due to the lack of specific recognition *** we report a mesoporous photonic crystal sensor incorporating carbon dots-based nanoreceptor(HMSS@CDs-PCs)for enhanced chloroform *** colloidal PC packed with hollow mesoporous silica spheres provides an interconnected ordered macro-meso-hierarchical porous structure,ideal for rapid gas sensing utilizing the photonic bandgap shift as the readout *** as-synthesized CDs with pyridinic-N-oxide functional groups adsorbed in the hollow mesoporous silica spheres are found to not only serve as the chloroform adsorption sites,but also a molecular glue that prevents crack formation in the colloidal *** sensitivity of HMSS@CDs-PCs sensor is 0.79 nm ppm^(-1)and an impressively low limit of detection is 3.22 ppm,which are the best reported values in fast-response chloroform vapor sensor without multi-signal *** positive response time is 7.5 s and the negative response time 9 ***,relatively stable sensing can be maintained within a relative humidity of 20%-85%RH and temperature of 25-55℃.This study demonstrates that HMSS@CDs-PCs sensors have practical application potential in indoor and outdoor chloroform vapor detection.

关键词： Carbon dots Photonic crystal sensors Sensitivity-enhanced sensing Selectivity-enhanced sensing Chloroform vapor sensing

Solitons in the Fifth-Order Kd V Equation with a Perturbation

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2025年第1期42卷 10-14页

作者： Wentao Li Yipu Chen zhao Zhang Xiangyu Yang Biao Li School of Mathematics and Statistics Ningbo UniversityNingbo 315211China School of Mathematics and Statistics Lingnan Normal UniversityZhanjiang 524048China School of Mathematical Sciences Dalian University of TechnologyDalian 116024China

The fifth-order Kd V equation with a perturbation term is naturally consistent with the shallow-water wave *** this study,the leading-order asymptotic solution of the perturbed fifth-order Kd V equation was derived using the multi-scale perturbation expansion ***,the asymptotic solution was reconsidered from the perspective of conservation laws,and consistent results were *** addition,the numerical solution of the slowly varying solitary wave asymptotic solution was obtained using the Fourier spectral method under appropriate initial conditions to better understand its dynamic *** results enrich research on fluid dynamics.

关键词： dynamics. method. asymptotic

在线全文

学校读者我要写书评

暂无评论

RNA干扰及其在植物研究中的应用

中国农学通报 2006年第4期22卷 36-39页

作者：赵明敏赵健郭永清李国俊长江大学农学院湖北荆州434205 长江大学动物科学学院湖北荆州434205 内蒙古农业大学职业技术学院内蒙古014100

RNA干扰(RNAinterference,RNAi)是双链RNA诱导的转录后基因沉默。RANi在生物体内普遍存在,且高度保守,被生物学家誉为生物体在基因组水平上的免疫系统。随着RNAi机制研究的不断深入,RNA干扰作为一种高效的、序列特异的基因沉默,可在植... 详细信息

RNA干扰(RNAinterference,RNAi)是双链RNA诱导的转录后基因沉默。RANi在生物体内普遍存在,且高度保守,被生物学家誉为生物体在基因组水平上的免疫系统。随着RNAi机制研究的不断深入,RNA干扰作为一种高效的、序列特异的基因沉默,可在植物基因功能分析、农作物基因组改良和植物抗病毒研究等方面发挥重要作用。

关键词： RNA干扰基因沉默植物

COMPrompter: reconceptualized segment anything model with multiprompt network for camouflaged object detection

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年第1期68卷 189-203页

作者： Xiaoqin ZHANG Zhenni YU Li zhao Deng-Ping FAN Guobao XIAO Zhejiang Province Key Laboratory of Intelligent Informatics for Safety and Emergency Wenzhou University Nankai International Advanced Research Institute (SHENZHEN FUTIAN) College of Computer Science Nankai University School of Computer Science and Technology Tongji University

We rethink the segment anything model(SAM) and propose a novel multiprompt network called COMPrompter for camouflaged object detection(COD). SAM has zero-shot generalization ability beyond other models and can provide an ideal framework for COD. Our network aims to enhance the single prompt strategy in SAM to a multiprompt strategy. To achieve this, we propose an edge gradient extraction module, which generates a mask containing gradient information regarding the boundaries of camouflaged objects. This gradient mask is then used as a novel boundary prompt, enhancing the segmentation process. Thereafter, we design a box-boundary mutual guidance module, which fosters more precise and comprehensive feature extraction via mutual guidance between a boundary prompt and a box prompt. This collaboration enhances the model's ability to accurately detect camouflaged objects. Moreover, we employ the discrete wavelet transform to extract high-frequency features from image embeddings. The high-frequency features serve as a supplementary component to the multiprompt ***, our COMPrompter guides the network to achieve enhanced segmentation results, thereby advancing the development of SAM in terms of COD. Experimental results across COD benchmarks demonstrate that COMPrompter achieves a cutting-edge performance, surpassing the current leading model by an average positive metric of 2.2% in COD10K. In the specific application of COD, the experimental results in polyp segmentation show that our model is superior to top-tier methods as well. The code will be made available at https://***/guobaoxiao/COMPrompter.

关键词： segment anything model camouflaged object detection boundary prompt

同方期刊数据库

An improved method to evaluate trap depth from thermoluminescence

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2025年第2期43卷 262-269页

作者： Shiyou Zhang Fangyi zhao Shengqiang Liu Zhen Song Quanlin Liu The Beijing Municipal Key Laboratory of New Energy Materials and Technologies School of Materials Science and EngineeringUniversity of Science and Technology Beijing

Rare earth-doped inorganic compounds contribute mostly to the family of persistent luminescent materials due to the versatile energy levels of rare earth *** of the key research aims is to match the trap level stemming from the doped rare earth ion or intrinsic defects to the electronic structure of the host,and therefore thermoluminescence measurement becomes a radical technology in studying trap depth,which is one of the significant parameters that determine the properties of persistent luminescence and photostimulated ***,the results of trap depth obtained by different thermoluminescence methods are quite different so that they are not ***,we analyzed different thermoluminescence methods,selected and improved the traditional peak position method of Tm/500 to be E=（-0.94Inβ+30.09）*** the experimental heating rate（β） is needed additionally,but the accuracy is improved greatly in most *** convenient and accurate method will accelerate the discovery of novel rare earth-doped materials.

关键词： Persistent luminescence Photostimulated luminescence Rare earths Thermoluminescence Trap depth

变电站空间电磁场对电力物联网汇聚节点线缆耦合特性分析

在线全文

学校读者我要写书评

暂无评论

南方电网技术 2022年第7期16卷 92-100页

作者：李谦张卫东杨志超赵明敏王沛付胜军关程远新能源电力系统国家重点实验室(华北电力大学电气与电子工程学院) 北京102206 国网浙江省电力有限公司嘉兴供电公司浙江嘉兴314033 中国电力科学研究院北京100192

GIS变电站复杂的空间电磁骚扰会耦合侵入智慧型变电站无线传感网络的汇聚节点设备,导致其丢包、误码,工作异常,严重时会导致设备永久性损坏,造成整个无线网络系统的崩溃。调研了几座不同组网类型的智慧型变电站,实测了某110 kV智慧型变... 详细信息

GIS变电站复杂的空间电磁骚扰会耦合侵入智慧型变电站无线传感网络的汇聚节点设备,导致其丢包、误码,工作异常,严重时会导致设备永久性损坏,造成整个无线网络系统的崩溃。调研了几座不同组网类型的智慧型变电站,实测了某110 kV智慧型变电站稳态情况下汇聚节点设备通信线和电源线的感应电流;分析了空间电磁场与汇聚节点线缆之间的耦合机理;建立了汇聚节点通信线和电源线的近场与远场情况下场线耦合的模型,并进行了芯线感应电压的计算;提出了用内部电路器件的噪声容限来判断芯线感应电压对汇聚节点的干扰程度。本文对汇聚节点在复杂电磁环境下的可靠性问题提出分析和建议,为推进电力物联网的大面积建设提供技术保障。

关键词：电力物联网智慧型变电站空间电磁场电磁干扰电磁兼容汇聚节点

Performance Analysis of a Coupled System based on Organic Rankine Cycle and Double Effect Absorption Refrigeration for Waste Heat Recovery in Data Center

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2025年第1期34卷 188-205页

作者： LI Peng XU Jiaqi WANG Binbin LIU Jianyang zhao Wensheng HAN Zhonghe School of Energy Power and Mechanical Engineering North China Electric Power UniversityBaoding 071003China Hebei Key Laboratory of Low Carbon and High Efficiency Power Generation Technology North China Electric Power UniversityBaoding 071003China

During data center operation,it generates a significant volume of low-grade waste *** recover waste heat,a coupled system including solar collector,double effect absorption refrigeration and organic Rankine cycle is *** system performance is analyzed in *** the organic Rankine cycle,five organic working fluids(R245fa,R245ca,R123,R11,and R113)are selected.R245fa,R113 and R245ca obtain the maximum net power output,thermal efficiency and exergy efficiency,*** the double effect absorption refrigeration system,the evaporation temperature,condensation temperature,and generation pressure affect the COP and exergy *** the generator pressure is unchanged,the COP increases with increasing evaporation temperature and decreasing condensation *** the COP reaches 1.3,the COP slightly decreases as the evaporation temperature or condensation temperature ***,the exergy efficiency of refrigeration systems exhibits the same trend as the COP,and the exergy efficiency maximum value appears at approximately 0.32.A new performance indicator,rPUE,was defined to evaluate the data center power utilization *** flow distribution ratio and heat source temperature were optimized with multi-objective *** the mass flow distribution rate is 0.6 and the heat source temperature is 441.5 K,rPUE and the total unit production costs of the system obtain the optimal solution.

关键词： data center solar heat collection organic Rankine cycle double effect absorption refrigeration waste heat recovery