检索结果-南通市图书馆

Computers, Materials & Continua 2024年第7期80卷 643-660页

作者： Tong Gan shuo dong Shiyou Wang Jiaxin Li Division of Consulting Beijing Metro Consultancy Corporation Ltd.Beijing100037China Department of Computer and Communication Engineering University of Science and Technology BeijingBeijing100083China

With the rapid development of urban rail transit,the existing track detection has some problems such as low efficiency and insufficient detection coverage,so an intelligent and automatic track detectionmethod based onUAV is urgently needed to avoid major safety *** the same time,the geographical distribution of IoT devices results in the inefficient use of the significant computing potential held by a large number of *** a result,the Dispersed Computing(DCOMP)architecture enables collaborative computing between devices in the Internet of Everything(IoE),promotes low-latency and efficient cross-wide applications,and meets users’growing needs for computing performance and service *** paper focuses on examining the resource allocation challenge within a dispersed computing environment that utilizes UAV inspection ***,the system takes into account both resource constraints and computational constraints and transforms the optimization problem into an energy minimization problem with computational *** Markov Decision Process(MDP)model is employed to capture the connection between the dispersed computing resource allocation strategy and the system ***,a method based on Double Deep Q-Network(DDQN)is introduced to derive the optimal ***,an experience replay mechanism is implemented to tackle the issue of increasing *** experimental simulations validate the efficacy of the method across various scenarios.

关键词： UAV track inspection dispersed computing resource allocation deep reinforcement learning Markov decision process

基于运营数据的发动机压气机叶片裂纹扩展规律研究

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

机械强度 2024年第3期46卷 602-610页

作者：师利中董硕刘雪峰陈健中国民航大学航空工程学院天津300300 中国航发上海商用航空发动机制造有限责任公司上海201306

为研究航空发动机实际服役中转子叶片在复杂载荷作用下的裂纹损伤扩展规律,基于航空发动机运营数据构建叶片的裂纹扩展寿命曲线,同时采用断裂力学理论建立裂纹扩展速率公式。以高压压气机叶片为实例,通过流固耦合方法构建压气机叶片结... 详细信息

为研究航空发动机实际服役中转子叶片在复杂载荷作用下的裂纹损伤扩展规律,基于航空发动机运营数据构建叶片的裂纹扩展寿命曲线,同时采用断裂力学理论建立裂纹扩展速率公式。以高压压气机叶片为实例,通过流固耦合方法构建压气机叶片结构的载荷模型,分别采用Paris、Walker、Newman裂纹扩展速率公式对压气机叶尖区域进行三维裂纹扩展分析。仿真结果表明,三种裂纹扩展速率公式在裂纹扩展前期预测结果与发动机运营数据裂纹扩展曲线具有一致性,可较好地描述叶片裂纹扩展规律;在裂纹稳定扩展阶段,Walker和Newman公式预测结果相对危险,Paris公式预测结果吻合度较高,并且能与厂家技术手册中关于其损伤发展控制要求相互印证。

关键词：压气机叶片运营数据断裂力学裂纹扩展速率公式寿命预测

Porous silicon/carbon composites as anodes for high-performance lithium-ion batteries

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

新型炭材料（中英文） 2024年第5期39卷 992-1002页

作者： TIAN Zhen-yu WANG Ya-fei QIN Xin Shaislamov Ulugbek Hojamberdiev Mirabbos ZHENG Tong-hui dong shuo ZHANG Xing-hao KONG De-bin ZHI Lin-jie School of Materials Science and Engineering China University of Petroleum(East China)Qingdao 266580China College of New Energy China University of Petroleum(East China)Qingdao 266580China Center for Development of Nanotechnology at the National University of Uzbekistan Tashkent 100174Uzbekistan Department of Physics National University of UzbekistanTashkent 100174Uzbekistan Institut für Chemie Technische Universität BerlinBerlin 10623Germany Advanced Chemical Engineering and Energy Materials Research Center China University of Petroleum(East China)Qingdao 266580China

Silicon anodes are promising for use in lithium-ion ***,their practical application is severely limited by their large volume expansion leading to irreversible material fracture and electrical *** study proposes a new top-down strategy for preparing microsize porous silicon and introduces polyacrylonitrile(PAN)for a nitrogen-doped carbon coating,which is designed to maintain the internal pore volume and lower the expansion of the anode during lithiation and *** then explore the effect of temperature on the evolution of the structure of PAN and the electrochemical behavior of the composite *** treatment at 400℃,the PAN coating retains a high nitrogen content of 11.35 at%,confirming the presence of C—N and C—O bonds that improve the ionic-electronic transport *** treatment not only results in a more intact carbon layer structure,but also introduces carbon defects,and produces a material that has remarkable stable cycling even at high *** cycled at 4 A g^(-1),the anode had a specific capacity of 857.6 mAh g^(-1) even after 200 cycles,demonstrating great potential for high-capacity energy storage applications.

关键词： Porous silicon Lithium-ion batteries Polyacrylonitrile Electrochemical behavior

美学区即刻种植常见生物学并发症风险因素及处理

在线全文

学校读者我要写书评

暂无评论

中国实用口腔科杂志 2024年第2期17卷 129-134页

作者：董硕汤春波南京医科大学附属口腔医院种植科江苏省口腔疾病研究重点实验室江苏省口腔转化医学工程研究中心江苏南京210029

美学区即刻种植具有明显的优势,能最大程度地保留软硬组织轮廓,是目前较常见的治疗方式。但是,相对于早期种植和延期种植,即刻种植失败率较高。种植体周围结缔组织炎症和骨组织进行性丧失是目前导致种植失败的主要原因。文章将从美学区... 详细信息

美学区即刻种植具有明显的优势,能最大程度地保留软硬组织轮廓,是目前较常见的治疗方式。但是,相对于早期种植和延期种植,即刻种植失败率较高。种植体周围结缔组织炎症和骨组织进行性丧失是目前导致种植失败的主要原因。文章将从美学区即刻种植常见生物学并发症的风险因素及处理方式进行探讨,以期为临床医生在预防和处理此类疾病时提供借鉴。

关键词：美学区即刻种植生物学并发症处理方式

城市轨道交通桥下空间功能更新适宜性研究——以北京地铁5号线为例

在线全文

学校读者我要写书评

暂无评论

城市建筑空间 2024年第6期31卷 45-48页

作者：董硕王江滨北京清华同衡规划设计研究院有限公司中国建筑设计研究院有限公司

以城市轨道交通桥下空间为研究对象,通过田野调查、文献研究等方法,归纳我国城市轨道交通桥下空间现状特征,梳理国内外轨道交通桥下空间功能更新实践,分析北京、上海等城市相关政策,提出城市轨道交通桥下空间功能更新适宜性影响要素,确... 详细信息

以城市轨道交通桥下空间为研究对象,通过田野调查、文献研究等方法,归纳我国城市轨道交通桥下空间现状特征,梳理国内外轨道交通桥下空间功能更新实践,分析北京、上海等城市相关政策,提出城市轨道交通桥下空间功能更新适宜性影响要素,确定功能更新适宜性评价方法。以北京地铁5号线为例,提出不同桥下空间功能更新适宜方向,以期对未来城市轨道交通桥下空间更新改造提供参考。

关键词：轨道交通桥下空间功能更新适宜性评价

Heparanase and hepatocellular carcinoma:Promoter or inhibitor?

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第3期16卷 306-311页

作者： dong, shuo Wu, Xiong-Zhi Tianjin Med Univ Canc Inst & Hosp Zhong Shan Men In Patient Dept Tianjin 300171 Peoples R China

Heparan sulphate proteoglycans (HSPGs) consist of a core protein and several heparan sulphate (HS) side chains covalently linked. HS also binds a great deal of growth factors, chemokines, cytokines and enzymes to the extracellular matrix and cell surface. Heparanase can specially cleave HS side chains from HSPGs. There are a lot of conflicting reports about the role of heparanase in hepatocellular carcinoma (HCC). Heparanase is involved in hepatitis B virus infection and hepatitis C virus infection, the activation of signal pathways, metastasis and apoptosis of HCC. Heparanase is synthesized as an inactive precursor within late endosomes and lysosomes. Then heparanase undergoes proteolytic cleavage to form an active enzyme in lysosomes. Active heparanase translocates to the nucleus, cell surface or extracellular matrix. Different locations of heparanase may exert different activities on tumor progression. Furthermore, enzymatic activities and non-enzymatic activities of heparanase may play different roles during HCC development. The expression level of heparanase may also contribute to the discrepant effects of heparanase. Growth promoting as well as growth inhibiting sequences are contained within the tumor cell surface heparan sulfate. Degrading different HSPGs by heparanase may play different roles in HCC. Systemic studies examining the processing, expression, localization and function of heparanase should shed a light on the role of heparanase in HCC.

关键词： Apoptosis Heparanase Heparan sulphate Hepatocellular carcinoma Infection Metastasis

抗菌聚己内酯基三维纤维骨架材料的制备及油水分离性能

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

高分子材料科学与工程 2024年第8期40卷 147-154页

作者：张文雅董硕刘絮瑶洪大卫程德山王英沣安徽工程大学纺织服装学院安徽芜湖241000 武汉纺织大学纺织科学与工程学院湖北武汉430200

油水分离及水体抗菌处理是水资源应用领域的重要课题。基于此,文中以二氯二甲基海因(DCDMH)为添加剂、聚己内酯(PCL)电纺纤维为骨架,构建了一种疏水亲油的三维纤维骨架材料。利用扫描电镜及表面能谱对材料的结构形态及元素分布进行了分... 详细信息

油水分离及水体抗菌处理是水资源应用领域的重要课题。基于此,文中以二氯二甲基海因(DCDMH)为添加剂、聚己内酯(PCL)电纺纤维为骨架,构建了一种疏水亲油的三维纤维骨架材料。利用扫描电镜及表面能谱对材料的结构形态及元素分布进行了分析,并对材料的密度及孔隙率进行了研究。这种材料疏水性能较好,接触角可达141.1o,且对有机溶剂的吸附性能优异,吸附量可达74~206 g/g。材料对有机溶剂循环吸附性能良好,15次吸附/解吸附后油水分离效率仍高于95%。基于DCDMH的添加,样品在30 min内对数量级为6的金黄色葡萄球菌及大肠杆菌灭活率可达到79.59%及71.76%,具有一定的抗菌效果。

关键词：聚己内酯静电纺丝抗菌卤胺油水分离

南海东部深水浊积砂岩气藏储层精细描述与连通性研究

在线全文

学校读者我要写书评

暂无评论

中国海上油气 2024年第2期36卷 98-109页

作者：杨娇戴建文董硕杨秋飞钟旭临涂乙朱璠马睿中海中海石油(中国)有限公司深圳分公司广东深圳518054

南海东部深水区油气资源丰富,深水重力流浊积砂岩展布复杂,砂体构型期次划分、构型单元叠置样式和连通关系直接制约气田的布井开发。以南海东部深水L气田为例开展研究,基于地震沉积学方法,运用沉积模式研究、复合水道体系构型及建模表... 详细信息

南海东部深水区油气资源丰富,深水重力流浊积砂岩展布复杂,砂体构型期次划分、构型单元叠置样式和连通关系直接制约气田的布井开发。以南海东部深水L气田为例开展研究,基于地震沉积学方法,运用沉积模式研究、复合水道体系构型及建模表征方法,开展了基于南海深水重力流复合砂体解剖,建立了本海域深水气田浊积水道复合砂体构型划分方案,开展了单期构型砂体空间演化和展布规律研究。研究成果表明:南海深水L气田浊积水道可划分为复合浊积体、复合水道和单一水道等3个级次,在气田内部平面上发育4条复合水道,纵向上发育2期河道,建立复合水道内部的沉积演化规律,明确了水道间的连通关系,并结合动态生产验证了连通关系的合理性,成功指导相邻B气田部署1口水平井,最高日产达130万方,生产效果较好。研究成果对推动周边气田开发及潜力勘探具有一定借鉴和启示意义。

关键词：珠江口盆地深水浊积砂岩重力流沉积水道复合体系水道化朵叶深水扇

Activation of TLR-4 and liver injury via NF-kappa B in rat with acute cholangitis

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2008年第2期7卷 185-191页

作者： Yu, Hong Wu, shuo-dong China Med Univ Dept Biliary & Minimal Invas Surg 1 Shengjing Hosp Shenyang 110004 Peoples R China

BACKGROUND: Toll-like receptors (TLRs) are a family of type 1 transmembrane receptors, which can recognize different pathogen-associated molecular patterns. Among them, TLR-4 is specific to lipopolysaccharide. It transfers the infection signal into the cell and promotes the translocation of nuclear factor kappa B (NF-kappa B) to the nucleus and the subsequent transcriptional activation of genes encoding pro- and anti-inflammatory cytokines and chemokines. Acute cholangitis (AC) is a common biliary tract infection in oriental countries, and often leads to liver injury. The activation of TLR-4 and its significance in liver injury in rats with AC remain unclear. METHODS: Rat models of AC (biliary tract obstruction+E. coli injection, n=36) and control models (biliary tract obstruction+saline, n=18) were made. Liver tissue injury was investigated by pathological examination. The levels of serum TNF-alpha and IL-10 were measured by enzyme-linked immunosorbent assay, and the expressions of TLR-4, NF-kappa B mRNAs and proteins in the liver were detected by RT-PCR, immunohistochemical staining and Western blotting, respectively. RESULTS: Severe liver tissue injury in rats with AC was evident as shown by pathological examination. TLR-4 and NF-kappa B were strongly expressed in the cytoplasm of hepatocytes in the AC group. They were negative or slightly positive in the control group. TLR-4 mRNA and protein in the liver of rats with AC increased 1 hour after biliary tract ligation and E. coli injection, and peaked at 6 hours after surgery. Twenty-four hours later, they began to decrease. The expression of TLR-4 was paralleled by that of NF-kappa B in the liver and TNF-alpha in serum. CONCLUSION: The higher expression of TLR-4 in the liver of rats with AC may be involved in liver injury through the activation of NF-kappa B and release of cytokines such as TNF-alpha.

关键词： acute cholangitis NF-kappa B toll-like receptor-4

Zn^(2+)和TiO_(2)合金化过程中不同成分占比对薄膜结构和光催化性能的影响

在线全文

学校读者我要写书评

暂无评论

物理学报 2024年第18期73卷 121-130页

作者：肖文悦董小硕买买提热夏提·买买提牛娜娜李国栋朱泽涛毕杰昊新疆大学物理科学与技术学院乌鲁木齐830017 新疆大学材料科学与工程学院乌鲁木齐830017

使用溶胶-凝胶法在单晶硅衬底上制备一批不同Zn^(2+)成分调节的TiO_(2)薄膜,观测Zn^(2+)和TiO_(2)合金化过程中光学和光催化性能的变化.X射线衍射光谱仪用于观测在合金化过程中薄膜的晶体结构变化并追踪ZnTiO_(3)化合物的形成.扫描电子... 详细信息

使用溶胶-凝胶法在单晶硅衬底上制备一批不同Zn^(2+)成分调节的TiO_(2)薄膜,观测Zn^(2+)和TiO_(2)合金化过程中光学和光催化性能的变化.X射线衍射光谱仪用于观测在合金化过程中薄膜的晶体结构变化并追踪ZnTiO_(3)化合物的形成.扫描电子显微镜、原子力显微镜用于观测合金化过程中因TiO_(2)晶格对Zn^(2+)溶解度有限而导致薄膜表面出现大量孔洞的现象.X射线光电子能谱和光学带隙用于观测Zn^(2+)与TiO_(2)合金化过程中电子结构层面的变化.最后,通过降解亚甲基蓝(MB)溶液,表明少量Zn^(2+)掺杂完全溶解在TiO_(2)中,并破坏TiO_(2)结晶质量.在Zn^(2+)的成分占比继续提高至15%的过程中,XPS峰形拟合结果验证了TiO_(2)对Zn^(2+)的溶解度有限,导致薄膜出现大量孔洞结构,薄膜的活性比表面积得以提升,同时Zn^(2+)可以有效地捕获光生e^(-)/h^(+).为了继续观察Zn^(2+)浓度对TiO_(2)的影响,将Zn^(2+)的浓度提升至40%,观察Zn^(2+)与TiO_(2)合金化过程中的现象.表明化合物ZnTiO_(3)的出现可以充当e^(-)/h^(+)的复合中心以及TiO_(2).占比的大幅下降导致合金化之后的薄膜光催化效率逐渐下降.

关键词： TiO_(2) Zn^(2+) 光催化带隙表面