检索结果-南通市图书馆

Experimental investigation on the movement mechanism of top coal in steeply inclined ultra-thick coal seams

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2021年第4期37卷 631-648,I0003页

作者： jiachen Wang Fei Liu Zhaohui Wang School of Energy and Mining Engineering China University of Mining&TechnologyBeijing 100083China Coal Industry Engineering Research Center of Top-Coal Caving Mining Beijing 100083China

The pre-blasting zones have a significant influence on the coal broken and the recovery rate of the top coal caving mining.This paper explores the coal movement mechanism in the top coal with pre-blasting zones based on the geological parameters of Jiangcang No.1 mine in the western of China.The steeply inclined ultra-thick coal seam was mined by using the sublevel top-coal caving mining method.The geo-image process system(GIPS)software was used to track the mark points on the coal and roof.The support was used to record the load on the top of the support during the caving mining process.The results show that the horizontal coal is moved to the shield window and the vertical coal is moved downward in the first level,while that in the second level shows consistency for the integrity of the coal.The vertical displacements of the corresponding points in the first level are lairger than that in the second level.However,the load on the top of the support in the first level is smaller than that in the second level.It indicated that the pre-blasting zones will give a more loosen top-coal and a small degree of difficulty in the top coal caving.

关键词： Sublevel Top coal caving Pre-blasting Physical modeling Movement mechanism

IXT: Improved searchable encryption for multi-word queries based on PSI

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2023年第5期17卷 153-163页

作者： Yunbo YANG Xiaolei DONG Zhenfu CAO jiachen SHEN Shangmin DOU Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062China Kunyao Academy of Shanghai Kunyao Network Technology Co. Ltd.Shanghai 200233China PwC US Advisory Shanghai AC Shanghai 201203China

Oblivious Cross-Tags(OXT)[1]is the first efficient searchable encryption(SE)protocol for conjunctive queries in a single-writer single-reader framework.However,it also has a trade-off between security and efficiency by leaking partial database information to the server.Recent attacks on these SE schemes show that the leakages from these SE schemes can be used to recover the content of queried keywords.To solve this problem,Lai et al.[2]propose Hidden Cross-Tags(HXT),which reduces the access pattern leakage from Keyword Pair Result Pattern(KPRP)to Whole Result Pattern(WRP).However,the WRP leakage can also be used to recover some additional contents of queried keywords.This paper proposes Improved Cross-Tags(IXT),an efficient searchable encryption protocol that achieves access and searches pattern hiding based on the labeled private set intersection.We also prove the proposed labeled private set intersection(PSI)protocol is secure against semi-honest adversaries,and IXT is-semi-honest secure(is leakage function).Finally,we do experiments to compare IXT with HXT.The experimental results show that the storage overhead and computation overhead of the search phase at the client-side in IXT is much lower than those in HXT.Meanwhile,the experimental results also show that IXT is scalable and can be applied to various sizes of datasets.

关键词： searchable encryption private set intersection

Multi-AUV Inspection for Process Monitoring of Underwater Oil Transportation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2023年第3期10卷 828-830页

作者： Jingyi He Jiabao Wen Shuai Xiao jiachen Yang School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China IEEE

Dear Editor,This letter presents an inspection method for process monitoring of underwater oil transportation via multiple autonomous underwater vehicles(AUV).To improve the adaptability of our method in practice,we introduce the dynamic complex ocean current data to the previously mentioned case by using regional ocean modeling system(ROMS)for the first time.

关键词： underwater mentioned autonomous

Energy-efficient task allocation for reliable parallel computation of cluster-based wireless sensor network in edge computing

在线全文

学校读者我要写书评

暂无评论

Digital Communications and Networks 2023年第2期9卷 473-482页

作者： Jiabao Wen jiachen Yang Tianying Wang Yang Li Zhihan Lv School of Electrical and Information Engineering Tianjin UniversityTianjin300072China College of Mechanical and Electrical Engineering Shihezi UniversityXinjiang832003China School of Data Science and Software Engineering Qingdao UniversityQingdao266000China

To efficiently complete a complex computation task,the complex task should be decomposed into subcomputation tasks that run parallel in edge computing.Wireless Sensor Network(WSN)is a typical application of parallel computation.To achieve highly reliable parallel computation for wireless sensor network,the network's lifetime needs to be extended.Therefore,a proper task allocation strategy is needed to reduce the energy consumption and balance the load of the network.This paper proposes a task model and a cluster-based WSN model in edge computing.In our model,different tasks require different types of resources and different sensors provide different types of resources,so our model is heterogeneous,which makes the model more practical.Then we propose a task allocation algorithm that combines the Genetic Algorithm(GA)and the Ant Colony Optimization(ACO)algorithm.The algorithm concentrates on energy conservation and load balancing so that the lifetime of the network can be extended.The experimental result shows the algorithm's effectiveness and advantages in energy conservation and load balancing.

关键词： Wireless sensor network Parallel computation Task allocation Genetic algorithm Ant colony optimization algorithm Energy-efficient Load balancing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

论民国江西词人群体

南阳师范学院学报 2020年第5期19卷 33-39页

作者：赵家晨江西师范大学文学院江西南昌310013

民国时期江西词人以《词学季刊》《同声月刊》《学衡》《青鹤》等杂志为依托,分别形成以夏敬观、龙榆生为领袖以及以王易、胡先骕为首的两支词人群。江西词人群体是以地缘、业缘、学缘为纽带结成,他们早期词学梦窗、彊村,词境质实、词... 详细信息

民国时期江西词人以《词学季刊》《同声月刊》《学衡》《青鹤》等杂志为依托,分别形成以夏敬观、龙榆生为领袖以及以王易、胡先骕为首的两支词人群。江西词人群体是以地缘、业缘、学缘为纽带结成,他们早期词学梦窗、彊村,词境质实、词风晦涩、情感沉郁;20世纪30年代中叶后标举“苏辛”,以词纪史,书写时事,词风飚烈。民国江西词人群体不仅延续了千年词统,以词记述民国特殊时期的家国史、学人心灵史,更促使时代词坛风会由“梦窗”转为“苏辛”,为新中国培植了大批词学传人。

关键词：江西词人群体创作意义

Current status and progress in immunotherapy for malignant pleural mesothelioma

在线全文

学校读者我要写书评

暂无评论

Chronic Diseases and Translational Medicine 2022年第2期8卷 91-99页

作者： Boyang Sun Yiting Dong jiachen Xu Zhijie Wang State Key Laboratory of Molecular Oncology Department of Medical OncologyNational Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100021China

Malignant pleural mesothelioma(MPM)is a rare and aggressive malignant disease.Currently,the platinum doublet of pemetrexed and cisplatin is the standard first-line treatment for unresectable MPM.However,recent promising results of immunotherapy have markedly changed the landscape of MPM treatment.Further,the ongoing innovative therapeutic strategies are expected to expand the range of treatment options;however,several questions remain unanswered.First,establishing predictive biomarkers with high potency is urgently needed to optimize the patient selection process.Second,further exploration of the combination algorithm is expected to unveil more effective and safe regimens.Moreover,other dilemmas,such as the resistance mechanism of immunotherapy and the role of immunotherapy in perioperative settings,still warrant further exploration.

关键词： immunotherapy mesothelioma predictive biomarker

在线全文

学校读者我要写书评

暂无评论

慢性骨髓炎抗生素应用疗程的研究进展

中华创伤骨科杂志 2022年第2期24卷 173-178页

作者：邸佳琛李文波时培晟薛云高秋明甘肃中医药大学第一临床医学院兰州730000 解放军联勤保障部队第九四〇医院创伤骨科兰州730000

慢性骨髓炎是一种常见疾病。骨髓炎传统治疗疗程是在彻底清创后使用4~6周的静脉注射抗生素治疗。然而,并没有确凿的证据证实,这一疗程相较于其他疗程的抗生素治疗具有优越性。近年来,随着对该疾病的认识愈发深入,各项治疗技术不断发展,... 详细信息

慢性骨髓炎是一种常见疾病。骨髓炎传统治疗疗程是在彻底清创后使用4~6周的静脉注射抗生素治疗。然而,并没有确凿的证据证实,这一疗程相较于其他疗程的抗生素治疗具有优越性。近年来,随着对该疾病的认识愈发深入,各项治疗技术不断发展,抗生素的使用方案也发生了改变。本文就慢性骨髓炎抗生素应用疗程的最新进展作一综述。

关键词：感染骨髓炎抗生素治疗疗程

Theoretical description of drawing body shape in an inclined seam with longwall top coal caving mining

在线全文

学校读者我要写书评

暂无评论

International Journal of Coal Science & Technology 2020年第1期7卷 182-195页

作者： jiachen Wang Weijie Wei Jinwang Zhang School of Energy and Mining Engineering China University of Mining and Technology(Beijing)Beijing 100083China Coal Industry Engineering Research Center of Top-coal Caving Mining Beijing 100083China

Understanding the characteristics of drawing body shape is essential for optimization of drawing parameters in longwall top coal caving mining.In this study,both physical experiments and theoretical analysis are employed to investigate these characteristics and derive a theoretical equation for the drawing body shape along the working face in an inclined seam.By analyzing the initial positions of drawn marked particles,the characteristics of the drawing body shape for different seam dip angles are obtained.It is shown that the drawing body of the top coal exhibits a shape-difference and volume-symmetry characteristic,on taking a vertical line through the center of support opening as the axis of symmetry,the shapes of the drawing body on the two sides of this axis are clearly different,but their volumes are equal.By establishing theoretical models of the drawing body in the initial drawing stage and the normal drawing stage,a theoretical equation for the drawing body in an inclined seam is proposed,which can accurately describe the characteristics of the drawing body shape.The shape characteristics and volume symmetry of the drawing body are further analyzed by comparing the results of theoretical calculations and numerical simulations.It is shown that one side of the drawing body is divided into two parts by an inflection point,with the lower part being a variation development area.This variation development area increases gradually with increasing seam dip angle,resulting in an asymmetry of the drawing body shape.However,the volume symmetry coefficient fluctuates around 1 for all values of the seam dip angle variation,and the volumes of the drawing body on the two sides are more or less equal as the variation development volume is more or less equal to the cut volume.Both theoretical calculations and numerical simulations confirm that the drawing body of the top coal exhibits the shape-difference and volume-symmetry characteristic.

关键词： Longwall top coal caving mining Inclined seam Top coal Drawing body shape Equation for drawing body

表皮干细胞在皮肤创面修复中的作用与机制研究进展

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华烧伤与创面修复杂志 2022年第9期38卷 854-858页

作者：石志远张博涵孙佳辰刘馨竹申传安解放军总医院第四医学中心烧伤整形医学部北京100048

表皮干细胞在皮肤自我更新、创面修复、再上皮化过程中发挥关键作用。单细胞测序、基因敲除等新技术新理念的出现进一步揭示了表皮干细胞维持表皮自我更新、参与创面修复的新机制,为创面修复提供了新思路。该文回顾了近年来关于表皮干... 详细信息

表皮干细胞在皮肤自我更新、创面修复、再上皮化过程中发挥关键作用。单细胞测序、基因敲除等新技术新理念的出现进一步揭示了表皮干细胞维持表皮自我更新、参与创面修复的新机制,为创面修复提供了新思路。该文回顾了近年来关于表皮干细胞的增殖、分化、迁移的机制,通过对表皮干细胞异质性与可塑性相关研究的分析,进一步加深对表皮干细胞生理功能的理解;结合表皮干细胞在创面修复领域中的应用进展,为从事创面修复相关工作的临床与基础研究工作者提供参考。

关键词：皮肤表皮干细胞干细胞异质性细胞可塑性创面修复