检索结果-南通市图书馆

Crystal phase control and ignition properties of HNS/CL-20 composite microspheres prepared by microfluidics combined with emulsification techniques

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第2期85卷 241-251页

作者： yi Liu Yunyan Guo Rui zhu Jinqiang Zhou Zhengxu Lin Kai Han Chongwei An Jingyu Wang Bidong Wu School of Environment and Safety Engineering North University of ChinaTaiyuan030051China School of Engineering Beijing Institute of TechnologyBeijing100081China Shanxi Province Ultrafine Powder Engineering Technology Research Center Taiyuan030051China

Improved controllability and energy density of ignition agents are of great significance for the devel-opment of energetic composite *** this study,droplet microfluidics and emulsification tech-niques were combined to prepare HNS/CL-20 composite microspheres with polyglycidyl azide polymer(GAP)as the *** influence of binder content on the morphology of microspheres was investi-gated,and the microspheres were characterized and tested for particle size,crystal structure,thermal decomposition,dispersibility,mechanical sensitivity,combustion behavior and detonation *** results showed that microspheres prepared with a binder content of 3%had higher sphericity and particle size *** microspheres retained the crystal structure of both HNS and CL-20(ε-type).Compared with raw HNS,the microspheres had higher apparent activation energy,better safety per-formance,and good *** ignition experiments and detonation performance tests show that HNS/CL-20 composite microspheres have excellent ignition performance,obvious combustion flame,and significant energy release effects,which are expected to achieve high energy and high-speed response of the igniter,thus improving the ignition reliability in special environments or systems.

关键词： Droplet microfluidics Emulsification technology Energetic materials Composite microspheres Crystal phase control Ignition

6DOF pose estimation of a 3D rigid object based on edge-enhanced point pair features

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computational Visual Media 2024年第1期10卷 61-77页

作者： Chenyi Liu Fei Chen Lu Deng Renjiao yi Lintao Zheng Chenyang zhu Jia Wang Kai Xu College of Computing National University of Defense TechnologyChangsha410073China Department of Spine Surgery the Second Xiangya HospitalCentral South UniversityChangsha410011China Clinical Nursing Teaching and Research Section the Second Xiangya HospitalChangsha410011China College of Meteorology and Oceanography National University of Defense TechnologyChangsha410073China Beijing Institute of Tracking and Communication Technology Beijing100094China

The point pair feature(PPF)is widely used for 6D pose *** this paper,we propose an efficient 6D pose estimation method based on the PPF *** introduce a well-targeted down-sampling strategy that focuses on edge areas for efficient feature extraction for complex geometry.A pose hypothesis validation approach is proposed to resolve ambiguity due to symmetry by calculating the edge matching *** perform evaluations on two challenging datasets and one real-world collected dataset,demonstrating the superiority of our method for pose estimation for geometrically complex,occluded,symmetrical *** further validate our method by applying it to simulated punctures.

关键词： point pair feature(PPF) pose estimation object recognition 3D point cloud

Optimization design of the hydro-pneumatic suspension system for high clearance self-propelled sprayer using improved MOPSO algorithm

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2024年第2期17卷 109-122页

作者： Fan Yang Yuefeng Du Changkai wen Zhen Li Enrong Mao Zhongxiang zhu College of Engineering China Agricultural UniversityBeijing 100083China Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment China Agricultural UniversityBeijing 100083China

Large high clearance self-propelled sprayers were widely used in field plant protection due to their high-efficiency operation *** by the characteristics of field operations such as high power,heavy weight,high ground clearance,and fast operation speed,the comprehensive requirements for the ride comfort,handling stability and road friendliness of the sprayer were increasingly *** the present stage,the chassis structure of the high clearance selfpropelled sprayer that attaches great importance to the improvement of comprehensive performance still has the problems of severe bumps,weak handling performance and serious road damage in complex field ***,this paper proposes an optimization design method for hydro-pneumatic suspension system of a high clearance self-propelled sprayer based on the improved MOPSO(Multi-Objective Particle Swarm Optimization)algorithm,covering the entire process of configuration design,parameter intelligent optimization,and system verification of the high clearance self-propelled sprayer ***,chassis structure of the hydro-pneumatic suspension suitable for the high clearance self-propelled sprayer was designed,and a design method combining the improved MOPSO algorithm based on time-varying fusion strategy and adaptive update with the parameter optimization of hydro-pneumatic suspension based on this algorithm was proposed,and finally the software simulation and bench performance verification were carried *** results show that the optimized hydropneumatic suspension has excellent vibration reduction effect,and the body acceleration,suspension dynamic deflection and tire deflection were increased by 16.5%,9.9%and 0.9%respectively,compared with those before *** comprehensive performance of the hydro-pneumatic suspension designed in this study is better than that of the traditional suspension.

关键词： high clearance self-propelled sprayer vibration reduction hydro-pneumatic suspension MOPSO multi-objective optimization

Understanding the role of manganese oxides in retaining harmful metals: Insights into oxidation and adsorption mechanisms at microstructure level

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Eco-Environment & Health 2024年第1期3卷 89-106页

作者： Feng Li Hui yin Tianqiang zhu wen zhuang School of Environmental Science and Engineering Shandong UniversityQingdaoShandong 266237China Institute of Marine Science and Technology Shandong UniversityQingdao 266237China Key Laboratory of Arable Land Conservation(Middle and Lower Reaches of Yangtse River) Ministry of Agriculture and Rural AffairsCollege of Resources and EnvironmentHuazhong Agricultural UniversityWuhan 430070China State Environmental Protection Key Laboratory of Soil Health and Green Remediation Ministry of Ecology and EnvironmentHuazhong Agricultural UniversityWuhan 430070China National Laboratory for Marine Science and Technology Qingdao 266237China Institute of Eco-environmental Forensics Shandong UniversityQingdao 266237China

The increasing intensity of human activities has led to a critical environmental challenge:widespread metal ***(Mn)oxides have emerged as potentially natural scavengers that perform crucial functions in the biogeochemical cycling of metal *** reviews have focused on the synthesis,characterization,and adsorption kinetics of Mn oxides,along with the transformation pathways of specific layered Mn *** review conducts a meticulous investigation of the molecular-level adsorption and oxidation mechanisms of Mn oxides on hazardous metals,including adsorption patterns,coordination,adsorption sites,and redox *** also provide a comprehensive discussion of both internal factors(surface area,crystallinity,octahedral vacancy content in Mn oxides,and reactant concentration)and external factors(pH,presence of doped or preadsorbed metal ions)affecting the adsorption/oxidation of metals by Mn ***,we identify existing gaps in understanding these mechanisms and suggest avenues for future *** goal is to enhance knowledge of Mn oxides'regulatory roles in metal element translocation and transformation at the microstructure level,offering a framework for developing effective metal adsorbents and pollution control strategies.

关键词： Manganese oxides Harmful metals Adsorption Redox Environment

Preparation of vanadium-based electrode materials and their research progress in solid-state flexible supercapacitors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 431-454页

作者： Rui-Jie zhu Jiang Liu Chao Hua Hao-Yu Pan yi-Jun Cao Meng Li Zhongyuan Critical Metals Laboratory Zhengzhou UniversityZhengzhou450001China School of Chemical Engineering Zhengzhou UniversityZhengzhou450001China

Solid-state flexible supercapacitors(SCs)have many advantages of high specific capacitance,excellent flexibility,fast charging and discharging,high power density,environmental friendliness,high safety,light weight,ductility,and long cycle *** are the ideal choice for the development of flexible energy storage technology in the future,and provide a good prospect for energy storage *** present,solid-state flexible SCs are widely used for portable electronic equipment and wearable energy storage equipment,the research of them has become the focus of a growing number of *** material is the key part of SCs and always determines the electrochemical performance of *** has been a hotspot and focus of ***-based compounds are considered to be a promising electrode material for SCs because of variable valence,open structure,high theoretical capacity,and low ***,this study first gives an overview of solid-state flexible SCs,then reviews the current research status of vanadium-based electrode materials in solid-state flexible SCs,and proposes some strategies to solve some problems of vanadium-based electrode materials.

关键词： Vanadium-based materials Flexible energy storage Specific capacitance Supercapacitors(SCs)

Acoustic characterization of hydrate formation and decomposition in clay-bearing sediments

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第4期21卷 2830-2838页

作者： yi-Jian zhu Xiao-Mei Yang Xing Huang Hao Li Xiao-Hui Wang yi-Fei Sun Peng Xiao Chang-Yu Sun Guang-Jin Chen State Key Laboratory of Heavy Oil Processing College of Chemical Engineering and Environment China University of Petroleum

Understanding the acoustic characteristics of hydrates in various sediments is crucial for hydrate resource detection and safe and efficient exploitation, as hydrate occurrence patterns vary greatly in different sediments. In this work, sediments with different bentonite contents, water saturations, and types were prepared to investigate the characteristics of P-wave velocity(reflecting the magnitude of hydrate saturation in the sediment) and amplitude(reflecting the degree of hydrate-sediment cementation) during hydrate formation and depressurization. During hydrate formation, the P-wave velocity and amplitude have similar trends. As clay content increases, the P-wave velocity increase rates quickened. On the other hand, the increased rate of P-wave velocity slows down with the increase of water saturation in the clay-bearing sediments. Comparing various types of sediment shows that the water absorption and swelling of bentonite reduce the pore space, speeding up the cementation of the hydrate with the sediment and increasing P-wave velocity at a faster rate. Correspondence between P-wave velocity and hydrate saturation is strongly related to sediment type, clay content, and water *** rapidly decreasing amplitude in the early stage of hydrate depressurization indicates that hydrate in clay-bearing sediments is weakly cemented to the sediments, which is prone to stratigraphic *** findings of this study offer guidance for hydrate resource assessments in clay-bearing sediments as well as geologic risk estimations during hydrate mining.

关键词： Gas hydrate Bentonite Illite P-wave velocity Amplitude

Fibroblast growth factor 21 inhibits ferroptosis following spinal cord injury by regulating heme oxygenase-1

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第7期19卷 1568-1574页

作者： Qi Gu Weiping Sha Qun Huang Jin Wang yi zhu Tianli Xu Zhenhua Xu Qiancheng zhu Jianfei Ge Shoujin Tian Xiaolong Lin Department of Orthopaedic Surgery Zhangjiagang Hospital Affiliated to Soochow UniversitySuzhouJiangsu ProvinceChina Orthopedics Laboratory The First People’s Hospital of Zhangjiagang CitySuzhouJiangsu ProvinceChina Department of Anesthesiology Zhangjiagang Hospital Affiliated to Soochow UniversitySuzhouJiangsu ProvinceChina

Interfering with the ferroptosis pathway is a new strategy for the treatment of spinal cord *** growth factor 21 can inhibit ferro ptosis and promote neurofunctional recovery,while heme oxygenase-1 is a regulator of iron and reactive oxygen species *** relationship between heme oxygenase-1and ferroptosis remains controve *** this study,we used a spinal co rd injury rat model to show that the levels of fibroblast growth factor 21 in spinal co rd tissue decreased after spinal cord *** addition,there was a significant aggravation of ferroptosis and a rapid increase in heme oxygenase-1 expression after spinal cord *** r,heme oxygenase-1 aggravated fe rroptosis after spinal cord injury,while fibroblast growth factor 21 inhibited fe rroptosis by downregulating heme ***,the activation of fibroblast growth factor 21 may provide a potential treatment for spinal co rd *** findings could provide a new potential mechanistic explanation for fibroblast growth factor 21 in the treatment of spinal cord injury.

关键词： ferroptosis fibroblast growth factor 21 functional recovery heme oxygenase-1 lipid peroxidation neuron reactive oxygen species spinal cord injury

在线全文

学校读者我要写书评

暂无评论

干细胞移植在肾脏疾病中的应用

中国当代儿科杂志 2012年第2期14卷 154-160,F0003页

作者：黄丹琳易文中南大学湘雅二医院儿科肾脏病专科/湖南省小儿肾脏病临床中心湖南长沙410011

该文总结干细胞移植在肾脏损伤修复中的治疗证据,着重讨论干细胞种类的选择、移植方法的选择、干细胞抵达肾脏的可能机制和它起效的可能机制。脐带间充质干细胞的应用具有广阔的前景,但细胞移植的途径和最佳剂量仍有待进一步研究。干细... 详细信息

该文总结干细胞移植在肾脏损伤修复中的治疗证据,着重讨论干细胞种类的选择、移植方法的选择、干细胞抵达肾脏的可能机制和它起效的可能机制。脐带间充质干细胞的应用具有广阔的前景,但细胞移植的途径和最佳剂量仍有待进一步研究。干细胞抵达肾脏的机制可能和靶部位表达和释放趋化干细胞的因子有关,而干细胞的旁分泌和内分泌功能可能是它发挥作用的主要的机制。关于干细胞移植治疗肾脏疾病还有许多问题有待解决,但是干细胞移植仍是急慢性肾脏疾病的治疗中一个充满前景和希望的治疗策略。

关键词：干细胞移植肾脏疾病

肾小管上皮细胞损伤在肾小管间质纤维化中的作用

在线全文

学校读者我要写书评

暂无评论

实用儿科临床杂志 2007年第17期22卷 1287-1289页

作者：易文陈丹中南大学湘雅二医院小儿肾脏病研究室长沙410011

肾小管上皮细胞(RTEC)损伤指肾小管受到缺氧、中毒、细胞/炎性反应因子、血浆蛋白或葡萄糖等因素作用后,RTEC活化、增生,小管扩张,管型形成,最终导致小管萎缩、凋亡和(或)纤维化。RTEC损伤尤其是小管萎缩引起肾间质纤维化是导致终末期... 详细信息

肾小管上皮细胞(RTEC)损伤指肾小管受到缺氧、中毒、细胞/炎性反应因子、血浆蛋白或葡萄糖等因素作用后,RTEC活化、增生,小管扩张,管型形成,最终导致小管萎缩、凋亡和(或)纤维化。RTEC损伤尤其是小管萎缩引起肾间质纤维化是导致终末期肾病的主要原因和共同病理过程。损伤后RTEC运动、迁移、分泌功能显著增强,正常小管间质结构破坏,同时产生大量化学趋化因子、致炎因子、促纤维形成因子和基质蛋白。这些病理变化往往相互影响,相互促进,参与肾间质纤维化病变的全过程,在肾间质纤维化病变的不同时期仅侧重点不同而已,最终结果是改变正常小管间质结构,诱导和促进肾间质纤维化的形成。

关键词：肾小管肾间质损伤纤维化萎缩转分化凋亡