检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

玉米免耕播种机振动特性分析与优化

农机化研究 2025年第4期47卷 122-126页

作者：何俊艺何家盼湖南汽车工程职业学院湖南株洲412001

玉米免耕播种机在作业时会产生振动,影响播种机的工作效率和生产质量,故对其振动特性进行分析和优化非常重要。为此,对玉米免耕播种机振动特性进行了分析与优化。首先,通过试验测试和有限元模拟确定了播种机的振动特性,包括自然频率、... 详细信息

玉米免耕播种机在作业时会产生振动,影响播种机的工作效率和生产质量,故对其振动特性进行分析和优化非常重要。为此,对玉米免耕播种机振动特性进行了分析与优化。首先,通过试验测试和有限元模拟确定了播种机的振动特性,包括自然频率、振型等;然后,针对振动特性中存在的问题,采用了多种优化方法(如结构优化、材料优化等),以改善播种机的振动性能;最后,通过试验和仿真模拟验证了优化后的播种机性能。研究结果表明:通过优化设计,可以有效地降低播种机的振动幅值,提高工作效率和生产质量。

关键词：玉米免耕播种机振动特性自然频率振型振幅结构优化

维普期刊数据库博看期刊

Analysis and Improvement of an Efficient Controlled Quantum Secure Direct Communication and Authentication Protocol

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2018年第12期57卷 621-633页

作者： jifeng Zhong Zhihao Liu Juan Xu Navigation College Jimei UniversityXiamen361021China School of Computer Science and Engineering Southeast UniversityNanjing211189China Key Laboratory of Computer Network and Information Integration Southeast UniversityMinistry of EducationNanjing211189China Institute for Quantum Computing University of WaterlooWaterlooONCanadaN2L3G1

The controlled quantum secure direct communication(CQSDC)with authentication protocol based on four particle cluster states via quantum one-time pad and local unitary operations is *** is found that there are some serious security issues in this *** eavesdropper(Eve)can eavesdrop on some information of the identity strings of the receiver and the controller without being detected by the selective-CNOT-operation(SCNO)*** the same attack,Eve can also steal some information of the secret message that the sender *** addition,the receiver can take the same kind of attack to eavesdrop on some information of the secret message out of the control of the *** means that the requirements of CQSDC are not *** last,we improve the original CQSDC protocol to a secure one.

关键词： Quantum cryptography controlled quantum secure direct communication selective-CNOT-operation attack

从中国式现代化实践的沃土中长出理论——华中乡土派的研究方法论

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

武汉大学学报（哲学社会科学版） 2025年第1期78卷 28-42页

作者：贺雪峰武汉大学社会学院湖北武汉430072

最近20多年来,华中村治研究群体坚持田野调研,做从土地中长出理论的学问,被学界称为华中乡土派。大量研究表明,当前中国社会科学研究存在的一个问题是过于强调小循环的对话式研究,而在对话式的研究中,中国式现代化的实践变成支离破碎的... 详细信息

最近20多年来,华中村治研究群体坚持田野调研,做从土地中长出理论的学问,被学界称为华中乡土派。大量研究表明,当前中国社会科学研究存在的一个问题是过于强调小循环的对话式研究,而在对话式的研究中,中国式现代化的实践变成支离破碎的经验片段,中国经验的完整性无法呈现,社会科学研究既无法回应中国式现代化实践中需要解答的问题,又无法从中国实践中形成一般化的理论。要改变中国社会科学研究的这一困境,必须强调中国社会科学的主体性,建立从中国式现代化实践中提出问题并回到实践中去接受检验的社会科学研究大循环。只有真正扎根田野,通过饱和经验训练,形成研究者经验质感,具备在研究中的想事能力,从伟大的中国式现代化实践中吸取理论营养,才能真正建立有主体性的中国社会科学。

关键词：中国式现代化中国自主知识体系经验质感饱和经验法

从“上海岁月”到延安时期:中共党建策略的演变及其长远影响——一项历史政治学的考察

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

武汉大学学报（哲学社会科学版） 2025年第1期78卷 16-27页

作者：贺东航复旦大学复旦大学社会科学高等研究院上海200433 复旦大学国际关系与公共事务学院上海200433

中共从成立初期的“上海岁月”至延安时期党建策略的演变对党的建设及中国革命的长远发展影响深远。在共产国际支持下,中共上海时期的党建工作确立了党的基本组织原则和运作模式,完成了从研究团体向初生政党的转变。这一时期党的基本框... 详细信息

中共从成立初期的“上海岁月”至延安时期党建策略的演变对党的建设及中国革命的长远发展影响深远。在共产国际支持下,中共上海时期的党建工作确立了党的基本组织原则和运作模式,完成了从研究团体向初生政党的转变。这一时期党的基本框架、路径和规则得到确立,包括党的组织原则、内部治理结构、党员标准以及党的日常运作,等等。在延安时期,中共通过“整风运动”等措施,进一步完善了党建策略,实现了思想统一和组织整合,为应对复杂的政治环境和战争挑战提供了坚实保障。特别是延安时期党建的特点和成就,包括思想建设、组织结构优化、领导层的示范作用、军队党建实践等方面,表明中共党建策略的演变并非一蹴而就,而是与当时面对的政治环境变化以及中国革命的进程密切相关。

关键词：党建策略 “上海岁月” 延安时期 “整风运动” 政党治理

维普期刊数据库博看期刊

Preparation of Co/S co-doped carbon catalysts for excellent methylene blue degradation

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 169-181页

作者： Haixu Li Haobo he Tiannan Jiang Yunfei Du Zhichen Wu Liang Xu Xinjie Wang Xiaoguang Liu Wanhua Yu Wendong Xue School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China Beijing Jinyu Tongda Refractory Technologies Co. Ltd.Beijing 100085China

S and Co co-doped carbon catalysts were prepared via pyrolysis of MOF-71 and thiourea mixtures at 800℃at a mass ratio of MOF-71 to thiourea of 1:0.1 to effectively activate peroxymonosulfate(PMS)for methylene blue(MB)*** effects of two different mixing routes were identified on the MB degradation ***,the catalyst obtained by the alcohol solvent evaporation(MOF-AEP)mixing route could degrade 95.60%MB(50 mg/L)within 4 min(degradation rate:K=0.78 min^(-1)),which was faster than that derived from the direct grinding method(MOF-DGP,80.97%,K=0.39 min^(-1)).X-ray photoelectron spectroscopy revealed that the Co-S content of MOF-AEP(43.39at%)was less than that of MOF-DGP(54.73at%),and the proportion of C-S-C in MOF-AEP(13.56at%)was higher than that of MOF-DGP(10.67at%).Density functional theory calculations revealed that the adsorption energy of Co for PMS was -2.94 eV when sulfur was doped as C-S-C on the carbon skeleton,which was higher than that when sulfur was doped next to cobalt in the form of Co-S bond(-2.86 eV).Thus,the C-S-C sites might provide more contributions to activate PMS compared with ***,the degradation parameters,including pH and MOF-AEP dosage,were ***,radical quenching experiments and electron paramagnetic resonance(EPR)measurements revealed that ^(1)O_(2)might be the primary catalytic species,whereas·O~(2-)might be the secondary one in degrading MB.

关键词： advanced oxidation process alcohol solvent evaporation hydrogen bond S and Co co-doped carbon catalysts wastewater remediation

Cohort study on the treatment of BRAF V600E mutant metastatic colorectal cancer with integrated Chinese and western medicine

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Oncology 2025年第1期16卷 25-33页

作者： Jiang-Yu Bian Yu-Fang Feng Wen-Ting he Tong Zhang Department of Oncology Xiyuan Hospital of China Academy of Chinese Medical SciencesBeijing 100091China Department of Oncology The Fourth Clinical Medical College of Xinjiang Medical UniversityUrumqi 830001China Department of Oncology Traditional Chinese Medicine Hospital Affiliated to Xinjiang Medical UniversityUrumqi 830001China

BACKGROUND Patients with BRAF V600E mutant metastatic colorectal cancer(mCRC)have a low incidence rate,poor biological activity,suboptimal response to conventional treatments,and a poor *** the previous cohort study on mCRC conducted by our team,it was observed that integrated Chinese and Western medicine treatment could significantly prolong the overall survival(OS)of patients with colorectal ***,we further explored the survival benefits in the population with BRAF V600E mutant *** To evaluate the efficacy of integrated Chinese and Western medicine in the treatment of BRAF V600E mutant metastatic colorectal *** A cohort study was conducted on patients with BRAF V600E mutant metastatic colorectal cancer admitted to Xiyuan Hospital of China Academy of Chinese Medical Sciences and Traditional Chinese Medicine Hospital of Xinjiang Uygur Autonomous Region from January 2016 to December *** patients were divided into two *** A total of 34 cases were included,with 23 in Chinese-Western medicine cohort(cohort A)and 11 in Western medicine cohort(cohort B).The median overall survival was 19.9 months in cohort A and 14.2 months in cohort B,with a statistically significant difference(P=0.038,hazard ratio=0.46).The 1-3-year survival rates were 95.65%(22/23),39.13%(9/23),and 26.09%(6/23)in cohort A,and 63.64%(7/11),18.18%(2/11),and 9.09%(1/11)in cohort B,*** analysis showed statistically significant differences in median OS between the two cohorts in the right colon,liver metastasis,chemotherapy,and first-line treatment subgroups(Phe survival and reduce the risk of death in patients with BRAF V600E mutant metastatic colorectal cancer,with more pronounced benefits observed in patients with right colon involvement,liver metastasis,combined chemotherapy,and first-line treatment.

关键词： Metastatic colorectal cancer BRAF V600E mutation Integrated Chinese and Western medicine Cohort study

Nonlocal thermo-elastic constitutive relation of fibre-reinforced composites

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

Acta Mechanica Sinica 2020年第1期36卷 176-187页

作者： Linjuan Wang jifeng Xu Jianxiang Wang Bhushan LKarihaloo State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering ScienceCollege of EngineeringPeking UniversityBeijing100871China CAPT-heDPS and IFSA Collaborative Innovation Center of MoECollege of EngineeringPeking UniversityBeijing100871China Beijing Aeronautical Science and Technology Research Institute Beijing100083China School of Engineering Cardiff UniversityCardiffCF243AAUK

The effective properties of composite materials have been predicted by various micromechanical *** composite materials of constituents which are described by the classical governing equations of the local form,the conventional micromechanical schemes usually give effective properties of the local ***,it is recognized that under general loading conditions,spatiotemporal nonlocal constitutive equations may better depict the macroscopic behavior of these *** this paper,we derive the thermo-elastic dynamic effective governing equations of a fibre-reinforced composite in a coupled spatiotemporal integral *** coupled equations reduce to the spatial nonlocal peridynamic formulation when the microstructural inertial effects are *** static deformation and steady-state heat conduction,we show that the integral formulation is superior at capturing the variations of the average displacement and temperature in regions of high gradients than the conventional micromechanical *** approach can be applied to analogous multi-field coupled problems of composites.

关键词： Nonlocal theory Thermoelasticity Composite materials Constitutive equations

All-inorganic perovskite solar cells with efficiency>20%

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 Materials 2021年第10期64卷 2624-2626页

作者： Di Zhang jifeng Yuan Jianjun Tian Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China

The power conversion efficiency(PCE)of organic-inorganic hybrid metal halide perovskite solar cells(PSCs)has rocketed from around 3%to more than 25%in a decade,showing a miracle in the development history of photovoltaics^([1]).However,the hybrid perovskites still suffer from the issue of thermodynamic instability due to the volatile organic cations in ***-inorganic metal halide perovskites.

关键词： perovskite inorganic halide

Study on membrane fouling of submerged membrane bioreactor in treating bathing wastewater

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2008年第10期20卷 1158-1167页

作者： GUO jifeng XIA Siqing WANG Rongchang ZHAO Jianfu State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and Engineering Tongji University Shanghai 200092 China

A pilot-scale submerged membrane bioreactor (MBR) was used to treat the bathing wastewater for more than 90 d. Several factors a?ecting membrane fouling were studied, including the variation in transmembrane pressure (TMP), changes in extracellular polymeric substance (EPS), and distribution of membrane resistance (R). The relationships between R and EPS concentration were found to be R = 0.00008(EPSS)2.915 in the mixed liquor (EPSS) and R = 0.2853(EPSm) – 0.824 on the membrane surface (EPSm). The constant ...

关键词： MBR membrane fouling extracellular polymeric substance (EPS) PCR-DGGE fluorescent in situ hybridization (FISH)