检索结果-南通市图书馆

Evaluation of Cold Resistance and Semi-lethal Low Temperature(LT 50)of Nine Pear Cultivars

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Agricultural Research 2024年第6期16卷 45-47页

作者： Huan LIU Lijuan GAO Jintao XU Minghui JI Longfei LI baofeng hao Changli Institute of Pomology Hebei Academy of Agriculture and Forestry SciencesChangli 066600China

[Objectives]To evaluate the cold resistance and semi-lethal temperature of pear cultivars,and provide a theoretical basis for the regional extension and breeding of cold-resistant pear cultivars.[Methods]Nine pear cultivars were used to study the changes in relative conductivity and cell injury rate of pear branches under low temperature stress,and the semi-lethal temperature(LT 50)of pear branches was analyzed by fitting Logistic equation.[Results]The relative conductivity and cell injury rate of pear branches took on the trend of slow increase,rapid increase,and slow increase the decrease of treatment temperature.The LC 50 of the nine pear cultivars were as follows:Nanguo pear-33.9℃,Wanyu-32.3℃,Red D Anjou-31.8℃,Jinfeng-31.3℃,Wujiuxiang-29.2℃,20 th Century Pear-29.1℃,Hanxiang-35.1℃,Yuluxiang-27.9℃and Korla Fragrant Pear-29.2℃.[Conclusions]The semi-lethal temperature could reflect the cold resistance of pear trees,and Wanxiang had better cold resistance.The evaluation of cold resistance and semi-lethal temperature of pear cultivars can provide theoretical basis for regional extension and breeding of cold-resistant pear cultivars.

关键词： Pear Cold resistance Semi-lethal temperature (LT 50 ) Low temperature

A Light and Simplified Branch Bending Method for Young Pear Trees

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diseases and Pests 2024年第2期15卷 19-21页

作者： Jintao XU Longfei LI Minghui JI Huan LIU Lijuan GAO baofeng hao Changli Institute of Pomology Hebei Academy of Agriculture and Forestry SciencesChangli 066600China

Aiming at high cost and low efficiency of conventional branch bending method in the modern intensive planting and labor-saving cultivation mode of young pear trees,this paper provides a new branch bending method with wide source of raw materials,cheap price and simple operation,which is also suitable for the management of low-age branches in the process of high grafting and upgrading of traditional big trees.

关键词： Pear tree Light and simplified Branch bending Method

A method for Improving the Efficiency of Pear Tree Crossbreeding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Agricultural Biotechnology 2024年第2期13卷 25-26,42页

作者： Jintao XU Longfei LI Minghui JI Huan LIU Lijuan GAO Yong GUO Yingjie WANG baofeng hao Changli Institute of Pomology Hebei Academy of Agriculture and Forestry SciencesChangli 066600China

In view of the short blooming period of pear tree crossbreeding and the complexity of pollination process, a method that can improve the efficiency of crossbreeding of pear trees was provided. Meanwhile, this method can also be applied to the study of pollen xenia effect, pollination tree selection and pure pollen collection in pear tree cultivation.

关键词： Pear tree Cross breeding Efficiency Method

Biomaterials-based anti-inflammatory treatment strategies for Alzheimer's disease

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第1期19卷 100-115页

作者： Jianjian Chu Weicong Zhang Yan Liu baofeng Gong Wenbo Ji Tong Yin Chao Gao Danqi Liangwen Mengqi hao Cuimin Chen Jianhua Zhuang Jie Gao You Yin Department of Neurology Second Affiliated Hospital(Shanghai Changzheng Hospital)of Naval Medical UniversityShanghaiChina School of Pharmacy University College LondonLondonUK Department of Clinical Pharmacy Xinhua HospitalShanghai Jiao Tong University School of MedicineClinical Pharmacy Innovation InstituteShanghai Jiao Tong University School of MedicineShanghaiChina School of Health Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina Changhai Clinical Research Unit Shanghai Changhai HospitalNaval Medical UniversityShanghaiChina

The current therapeutic drugs for Alzheimer's disease only improve symptoms,they do not delay disease progression.Therefo re,there is an urgent need for new effective drugs.The underlying pathogenic factors of Alzheimer's disease are not clear,but neuroinflammation can link various hypotheses of Alzheimer's disease;hence,targeting neuroinflammation may be a new hope for Alzheimer's disease treatment.Inhibiting inflammation can restore neuronal function,promote neuro regeneration,reduce the pathological burden of Alzheimer's disease,and improve or even reverse symptoms of Alzheimer's disease.This review focuses on the relationship between inflammation and various pathological hypotheses of Alzheimer's disease;reports the mechanisms and characteristics of small-molecule drugs(e.g.,nonsteroidal anti-inflammatory drugs,neurosteroids,and plant extracts);macromolecule drugs(e.g.,peptides,proteins,and gene therapeutics);and nanocarriers(e.g.,lipid-based nanoparticles,polymeric nanoparticles,nanoemulsions,and inorganic nanoparticles)in the treatment of Alzheimer's disease.The review also makes recommendations for the prospective development of anti-inflammatory strategies based on nanocarriers for the treatment of Alzheimer's disease.

关键词： Alzheimer's disease anti-inflammation blood-brain barrier drug delivery microglia nanoparticles neuroinflammation plant extracts

维普期刊数据库

Enrichment characteristics of normal-pressure marine shale gas in the complex tectonic zone: a case study of the Lower Cambrian Niutitang Formation in northern Guizhou

在线全文

学校读者我要写书评

暂无评论

Journal of Earth Science 2024年

作者： Wenjibin Sun Zhonghu Wu Yujun Zuo Chao Pan hao Liu baofeng Lan Jianyun Lin Bin Chen Qinggang Chen Guizhou Energy Industry Research Institute Co. Ltd Mining College Guizhou University College of Resource and Environmental Engineering Guizhou University College of Civil Engineering Guizhou University

The Lower Cambrian Niutitang Formation is a crucial stratum for the exploration of normal-pressure marine shale gas in southern China， with great development potential. To research the normal-pressure shale gas accumulation of the Niutitang Formation in the complex tectonic zone， the shale cores in northern Guizhou were subjected to X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) observation， and tests were conducted to determine total organic content (TOC)， bitumen reflectance， and nitrogen isotopes. The results indicate that the equivalent vitrinite reflectance of cores varies from 2.30% to 3.73%， and the TOC content of cores varies from 3.8% to 7.8%. The total gas content of three wells in northern Guizhou is 0.5 m3/t， 0.3 m3/t， and 1.4 m3/t， respectively. The TOC content of the shale in the syncline structure is higher than that of the shale in the anticline structure. Nitrogen in shale gas originates primarily from the thermal ammoniation of organic matter， the atmosphere， and the deep crust. Shale gas preservation is favourable in regions with a large range of lifting， and small lifting differences. The syncline is broad and gentle with few faults have better gas accumulation conditions. The Niutitang Formation in the residual syncline of the study area has better gas content than that of other structures. Exploration of shale gas accumulation sweet spots in northern Guizhou should focus on the broad-gentle synclines with minimal changes in stratigraphic lifting， few faults， and no hydrothermal activity at the edges of paleo-uplifts.

关键词：

Enhancing SAEAs with unevaluated solutions:a case study of relation model for expensive optimization

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第2期67卷 41-58页

作者： hao hao Xiaoqun ZHANG Aimin ZHOU Institute of Natural Sciences Shanghai Jiao Tong University Shanghai Frontiers Science Center of Molecule Intelligent Syntheses School of Computer Science and Technology East China Normal University

Surrogate-assisted evolutionary algorithms(SAEAs) hold significant importance in resolving expensive optimization problems. Extensive efforts have been devoted to improving the efficiency of SAEAs through the development of proficient model-assisted solution selection methods, which, however, first requires generating high-quality solutions. The fundamental paradigm of evaluating a limited number of solutions in each generation within SAEAs reduces the variance of adjacent populations, thereby affecting the quality of offspring solutions. This is a frequently encountered issue yet receives little attention. To address the issue, this paper presents a framework using unevaluated solutions to enhance the efficiency of SAEAs.The surrogate model is employed to identify high-quality solutions for the direct generation of new solutions without evaluation. To ensure dependable selection, we have introduced two tailored relation models to select the optimal solution and the unevaluated population. A comprehensive experimental analysis is performed on two test suites, which showcases the superiority of the relation model over regression and classification models in the solution selection phase. Furthermore, the surrogate-selected unevaluated solutions with high potential have been shown to enhance the efficiency of the algorithm significantly.

关键词： expensive optimization unevaluated solutions relation model surrogate-assisted evolutionary algorithm

Very long wave infrared quantum dot photodetector up to 18μm

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第4期13卷 772-782页

作者： Xiaomeng Xue Qun hao Menglu Chen School of Optics and Photonics Beijing Institute of TechnologyBeijing 100081China. Westlake Institute for Optoelectronics FuyangHangzhou 311421China. Physics Department Changchun University of Science and TechnologyChangchun 130022China

Colloidal quantum dots(CQDs)are of interest for optoelectronic devices because of the possibility of high-throughput solution processing and the wide energy gap tunability from ultraviolet to infrared wavelengths.People may question about the upper limit on the CQD wavelength region.To date,although the CQD absorption already reaches terahertz,the practical photodetection wavelength is limited within mid-wave infrared.To figure out challenges on CQD photoresponse in longer wavelength,would reveal the ultimate property on these nanomaterials.What’s more,it motivates interest in bottom-up infrared photodetection with less than 10%cost compared with epitaxial growth semiconductor bulk.In this work,developing a re-growth method and ionic doping modification,we demonstrate photodetection up to 18μm wavelength on HgTe CQD.At liquid nitrogen temperature,the responsivity reaches 0.3 A/W and 0.13 A/W,with specific detectivity 6.6×108 Jones and 2.3×109 Jones for 18μm and 10μm CQD photoconductors,respectively.This work is a step toward answering the general question on the CQD photodetection wavelength limitation.

关键词： quantum wave ultraviolet

A Global Optimality Principle for Fully Coupled Mean-field Control Systems

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 Mathematicae Applicatae Sinica 2024年第2期40卷 379-413页

作者： Tao hao School of Statistics and Mathematics Shandong University of Finance and EconomicsJinan 250014China

This paper concerns a global optimality principle for fully coupled mean-field control systems.Both the first-order and the second-order variational equations are fully coupled mean-field linear FBSDEs. A new linear relation is introduced, with which we successfully decouple the fully coupled first-order variational equations. We give a new second-order expansion of Y^(ε) that can work well in mean-field framework. Based on this result, the stochastic maximum principle is proved. The comparison with the stochastic maximum principle for controlled mean-field stochastic differential equations is supplied.

关键词： optimal control global maximum principle fully coupled general mean-field FBSDE adjoint equation recursive utility

维普期刊数据库

Microbes in mass extinction: an accomplice or a savior?

在线全文

学校读者我要写书评

暂无评论

National Science Review 2024年第1期11卷 12-15页

作者： Genming Luo Deng Liu hao Yang China University of Geosciences (Wuhan) State Key Laboratory of Geobiology and Environmental Geology

Microbes include various types of organisms that are invisible to the naked eye,e.g. bacteria, archaea and microeukaryotes. Although the precise number remains largely unknown, microbes are recognized as the unseen majority of our biosphere [1]. As a group of organisms classified by body size, microbes cover a considerable spectrum of metabolisms,

关键词： AFTERMATH