检索结果-南通市图书馆

Manure substitution improves maize yield by promoting soil fertility and mediating the microbial community in lime concretion black soil

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

Journal of Integrative Agriculture 2024年第2期23卷 698-710页

作者： Minghui Cao Yan Duan Minghao Li Caiguo Tang Wenjie Kan Jiangye Li Huilan Zhang Wenling Zhong Lifang wu The Center for Ion Beam Bioengineering&Green Agriculture Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China zhongke Taihe Experimental Station Taihe 236626China Institute of Resources and Environment Jiangsu Academy of Agricultural SciencesNanjing 210014China

Synthetic nitrogen(N)fertilizer has made a great contribution to the improvement of soil fertility and productivity,but excessive application of synthetic N fertilizer may cause agroecosystem risks,such as soil acidification,groundwater contamination and biodiversity ***,organic substitution has received increasing attention for its ecologically and environmentally friendly and productivity ***,the linkages between manure substitution,crop yield and the underlying microbial mechanisms remain *** bridge this gap,a three-year field experiment was conducted with five fertilization regimes:i)Control,non-fertilization;CF,conventional synthetic fertilizer application;CF_(1/2)M_(1/2),1/2 N input via synthetic fertilizer and 1/2 N input via manure;CF_(1/4)M_(3/4),1/4 N input synthetic fertilizer and 3/4 N input via manure;M,manure *** fertilization treatments were designed to have equal N *** results showed that all manure substituted treatments achieved high soil fertility indexes(SFI)and productivities by increasing the soil organic carbon(SOC),total N(TN)and available phosphorus(AP)concentrations,and by altering the bacterial community diversity and composition compared with ***,AP,and the soil C:N ratio were mainly responsible for microbial community *** co-occurrence network revealed that SOC and AP had strong positive associations with Rhodospirillales and Burkholderiales,while TN and C:N ratio had positive and negative associations with Micromonosporaceae,*** specific taxa are implicated in soil macroelement *** Forest analysis predicted that both biotic(bacterial composition and Micromonosporaceae)and abiotic(AP,SOC,SFI,and TN)factors had significant effects on crop *** present work strengthens our understanding of the effects of manure substitution on crop yield and provides theoretical support for optimizing fertilization strategies.

关键词： fertilization manure substitution soil fertility maize yield bacterial community

A Dielectric Ink Combining Acrylate and Cyanate Moieties for Inkjet 3D Printing with Good Thermal Stability

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 766-774页

作者： Yi-Xuan Li Liang-Ying wu Yan Yang Yao-Zhong Lu Zhong-Ying Ji Yu-Xiong Guo Xiao-Long Wang Qiao-Sheng Pu State Key Laboratory of Applied Organic Chemistry College of Chemistry and Chemical EngineeringLanzhou UniversityLanzhou730000China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsLanzhou730000China Lanzhou Traditional Chinese Medicine Hospital of Orthopedics and Traumatology Lanzhou730000China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai Zhongke Research Institute of Advanced Materials and Green Chemical EngineeringYantai264006China

Inkjet 3D printing has potential in the additive manufacturing of electronic circuits and ***,inks that can be used for printing layers with T5%>300℃ or hardness>200 MPa have been rarely *** ester(CE)polymers have excellent thermal stability,high strength,and low shrinkage compared to other common dielectric inks for inkjet 3D printing,but cannot be quickly shaped by ultraviolet(UV)irradiation or thermal *** CEs with UV-curable monomers may be a possible way to accelerate crosslinking,but there are challenges from the adverse effects of the dilution of both *** this study,dielectric inks with acrylate and cyanate moieties were *** low viscosity and surface tension of the CE precursor(Bisphenol E cyanate ester)were combined with photocurable acrylate diluent monomers and cross-linker to realize an ink suitable for inkjet 3D *** internal dual three-dimensional cross-linked network structure resin was prepared by a combination of photocuring and thermal curing with T5%up to 326.69℃,hardness up to 431.84 MPa,dielectric constant of 2.70 at 8 GHz,and shrinkage of 1.64%.The developed dielectric inks can be applied to the 3D printing of printed circuit boards and other electronic devices that require dielectric properties.

关键词： Inkjet printing Cyanate ester resin 3D doubly cross-linked network Good thermal stability

在线全文

学校读者我要写书评

暂无评论

基于模糊观测器的容错控制及应用

西北工业大学学报 1999年第3期17卷 376-380页

作者：杨建军史忠科吴方向戴冠中西北工业大学

基于Ｔ Ｓ模糊模型，针对状态可直接测量的模糊系统，通过把其描述为一族局部状态空间模型，提出了一种新的观测器离散设计方法。该方法对每一个局部状态空间模型，分别对失效的传感器进行观测器设计，从而重构出失了效的传感器不能... 详细信息

基于Ｔ Ｓ模糊模型，针对状态可直接测量的模糊系统，通过把其描述为一族局部状态空间模型，提出了一种新的观测器离散设计方法。该方法对每一个局部状态空间模型，分别对失效的传感器进行观测器设计，从而重构出失了效的传感器不能测量到的状态而实现容错控制。本文方法易于设计，便于实时实现，克服了常规设计方法的复杂性，最后把该方法应用到某飞机横侧向飞行容错控制，证明了其有效性。

关键词：容错控制模糊观测器传感器失效飞机

在线全文

学校读者我要写书评

暂无评论

纳米固废混凝土的弯曲疲劳性能方差分析

低温建筑技术 2024年第8期46卷 50-53,66页

作者：王振武钢张茂花申忠科李佳敏东北林业大学土木与交通学院哈尔滨150040 北京科技大学土木与资源工程学院北京100083

为促进固废材料的资源化利用,研究采用固废材料全替代水泥并掺加不同掺量的纳米SiO_(2)和纳米CaCO_(3)制备纳米固废混凝土,进行纳米固废混凝土的抗折强度试验和弯曲疲劳试验。试验结果表明,纳米材料可以增强固废混凝土的抗折强度并改善... 详细信息

为促进固废材料的资源化利用,研究采用固废材料全替代水泥并掺加不同掺量的纳米SiO_(2)和纳米CaCO_(3)制备纳米固废混凝土,进行纳米固废混凝土的抗折强度试验和弯曲疲劳试验。试验结果表明,纳米材料可以增强固废混凝土的抗折强度并改善其弯曲疲劳性能,纳米SiO_(2)和纳米CaCO_(3)分别在掺量为2%和1%时对固废混凝土的抗折强度和疲劳性能的改善效果最显著。研究可为固废混凝土在道路、桥梁以及港口码头等交通基础设施中的推广应用提供理论依据。

关键词：纳米材料固废混凝土弯曲疲劳性能方差分析

Diversity, novelty, antimicrobial activity, and new antibiotics of cultivable endophytic actinobacteria isolated from psammophytes collected from Taklamakan Desert

在线全文

学校读者我要写书评

暂无评论

Journal of Pharmaceutical Analysis 2021年第2期11卷 241-250页

作者： Ting Wang Feina Li Qinpei Lu Gang wu zhongke Jiang Shaowei Liu Xugela Habden Elizaveta A.Razumova Ilya A.Osterman Petr V.Sergiev Olga A.Dontsova Xinxin Hu Xuefu You Chenghang Sun Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100050China Beijing Key Laboratory of Antimicrobial Agents Institute of Medicinal BiotechnologyChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing100050China College of Life Science Xinjiang Normal UniversityUrumchi830054China Lomonosov Moscow State University Moscow119992Russia Center of Life Sciences Skolkovo Institute of Science and TechnologyMoscow143025Russia Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of SciencesMoscow119992Russia

Three hundred and twenty endophytic actinobacterial strains were isolated from psammophytes collected from Taklamakan Desert and identified. Among them, three strains already had been identified as new species of two genera and sixteen isolates showed relatively low 16 S rRNA similarities < 98.6% to validly described species. Seventy-five of the isolates were selected as representative strains to screen antibacterial activity and mechanism. Forty-seven strains showed antagonistic activity against at least one of the indicator bacteria. Two Streptomyces strains produced bioactive compounds inducing DNA damage, and two Streptomyces strains produced bioactive compounds with inhibitory activity on protein biosynthesis. Notably, the strain Streptomyces sp. 8P21H-1 that demonstrated both strong antibacterial activity and inhibitory activity on protein biosynthesis was prioritized for exploring new *** the strategy of integrating genetics-based discovery program and MS/MS-based molecular networking, two new streptogramin-type antibiotics, i.e., acetyl-griseoviridin and desulphurizing griseoviridin, along with known griseoviridin, were isolated from the culture broth of strain 8P21H-1. Their chemical structures were determined by HR-MS, and 1D and 2D NMR. Desulphurizing griseoviridin and griseoviridin exhibited antibacterial activities by inhibiting translation.

关键词： Taklamakan desert Endophytic actinobacteria Novelty Diversity Streptogramin-type antibiotic

中国资源型城市城镇化发展差异的解释——基于Shapley值分解方法

在线全文

学校读者我要写书评

暂无评论

中国土地科学 2019年第12期33卷 72-79页

作者：吴静白中科中国地质大学(北京)土地科学技术学院北京100083 自然资源部土地整治重点实验室北京100035 自然资源部矿区生态修复工程技术创新中心北京100083

研究目的:分析经济、社会、产业、空间、公共服务和生态环境6个方面的影响因素对资源型城市城镇化发展水平差异的贡献度。研究方法:固定效应模型、Shapley值分解法。研究结果:(1)第三产业增加值占GDP比重是形成各资源型城市城镇化差异... 详细信息

研究目的:分析经济、社会、产业、空间、公共服务和生态环境6个方面的影响因素对资源型城市城镇化发展水平差异的贡献度。研究方法:固定效应模型、Shapley值分解法。研究结果:(1)第三产业增加值占GDP比重是形成各资源型城市城镇化差异的主要原因,其平均贡献率为97.79%,其次资源型城市城镇化水平差异化还受到财政支出占GDP比重的影响,平均贡献率为13.71%,人口密度、第三产业就业和人均拥有道路面积也是资源型城市城镇化水平差异化的原因,但贡献率较小,分别为0.51%、0.24%和0.03%;(2)工业二氧化硫排放量、人均GDP和第二产业增加值占GDP比重对资源型城市城镇化发展水平差异化的贡献率为负,是缩小资源型城市城镇化水平发展差异的因素。研究结论:随着经济增速的放缓及工业结构的调整,各影响因素对资源型城市城镇化的发展贡献度不同,即形成资源型城市城镇化水平差异化的主导因素具有动态性。

关键词：城镇化资源型城市贡献度 Shapley值分解

ROBUST STABILITY CRITERIA FOR SYSTEM WITH DELAY & ITS APPLICATION TO FCS

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 1997年第3期10卷 63-67页

作者： wu Fangxiang, Shi zhongke, Yang Jianjun, Dai Guanzhong (Department of Automatic Control, Northwestern Polytechnical University, Xian, China, 710072)

A study is devoted to the delay robust stability for linear system with time delay, using matrix analysis and comparison theory on differential integral difference equations. Since the matrix norm used to derive the results may be arbitrary consistent matrix norm, the obtained results possess some agility, and it makes quite convenient to check stability for linear systems with time delay. In particular, a sufficient and necessary condition for delay robust stability is obtained, and a formula to calculate the maximum delay for systems with stability is given. At the end, the results are used to analyze a flight control system (FCS). Comparison with some literature shows that the criteria in this paper are not only simple, but also of small conservativeness.

关键词： flight control robustness (mathematics) stability system with time delay delay independent stability delay robust stability

加快发展新生产力背景下传统制造业数字化转型的路径研究

在线全文

学校读者我要写书评

暂无评论

高科技与产业化 2024年第7期30卷 87-89页

作者：吴雪吴磊西安交通工程学院西安710300 西安中科华芯测控有限公司西安710300

传统制造业一直是我国推动高质量发展的重要基础性工作,是发展形成新质生产力的重要组成部分。加快发展新质生产为传统制造业数字化转型提供了重要机遇、强大推动力和良好政策环境。加快发展新质生产力,能增强传统制造业创新驱动能力,... 详细信息

传统制造业一直是我国推动高质量发展的重要基础性工作,是发展形成新质生产力的重要组成部分。加快发展新质生产为传统制造业数字化转型提供了重要机遇、强大推动力和良好政策环境。加快发展新质生产力,能增强传统制造业创新驱动能力,促进生产要素、生产模式和科技创新方式变革。将传统制造业数字化转型作为发展新质生产力的重要内容要一体化部署安排,统筹推进,充分发挥政府引导和企业主体作用,进一步推动相关硬件设施、设备的更新改造,大力支持关键共享技术开发,强化制度保障和人才支撑。

关键词：新质生产力传统制造业数字化转型路径

在线全文

学校读者我要写书评

暂无评论

滞后区间系统的鲁棒稳定性分析及其应用

西北工业大学学报 1999年第2期17卷 236-240页

作者：吴方向史忠科戴冠中西北工业大学

研究了滞后区间系统的鲁棒稳定性和镇定问题。基于Ｌｙａｐｕｎｏｖ原理，给出了判断滞后区间系统的时滞独立渐近稳定的充分条件，这个充分条件是一个代数Ｒｉｃｃａｔｉ不等式方程存在正定解。进一步，利用这个充分条件得到了镇定问题... 详细信息

研究了滞后区间系统的鲁棒稳定性和镇定问题。基于Ｌｙａｐｕｎｏｖ原理，给出了判断滞后区间系统的时滞独立渐近稳定的充分条件，这个充分条件是一个代数Ｒｉｃｃａｔｉ不等式方程存在正定解。进一步，利用这个充分条件得到了镇定问题的解，所设计的静态线性反馈控制律保证区间闭环系统内部稳定。对国产某型飞机运动系统的分析，说明本文的结果是有用的。

关键词：滞后区间系统镇定飞机运动系统鲁棒稳定性