检索结果-南通市图书馆

Shock Initiation Experiments with Modeling on a DNAN Based MeltCast Insensitive Explosive

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第2期32卷 655-662页

作者： Feichao Miao dandan li Yangfan Cheng Junjiong Meng lin Zhou School of Chemical Engineering Anhui University of Science and TechnologyHuainan 232001China Composite Explosive Research Department Xi'an Modern Chemistry Research InstituteXi'an 710065China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

2,4-dinitroanisole(DNAN)is a good replacement for 2,4,6-trinitrotoluene(TNT)in melt-cast explosives due to its superior *** the increasing use of DNAN-based melt-cast explosives,the prediction of reaction violence and hazard assessment of the explosives subjected to shock is of great *** study investigated the shock initiation characteristics for a DNAN-based melt-cast explosive,DHFA,using the one-dimensional Lagrangian *** embedded manganin gauges in the apparatus record the pressure histories at four Lagrangian positions and show that shock-todetonation transition in DHFA needs a high input shock *** experimental data are analyzed to calibrate the Ignition and Growth *** calibration is performed using an objective function based on both pressure history and the arrival time of *** agreement between experimental and calculated pressure histories indicates the high accuracy of the calibrated parameters with the optimization method.

关键词： 2,4-Dinitroanisole(DNAN) Shock initiation Insensitive explosives Ignition and growth model Equation of state(EOS)

Plasmon coupling-driven enhanced high-order multiphoton excited fluorescent performance of metal-organic frameworks

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第7期17卷 6502-6508页

作者： Tong Meng Bo li linlin Zeng Xianshun Sun Yupeng Tian Hongping Zhou Meng Zhou dandan li Institutes of Physical Science and Information Technology Key Laboratory of Structure and Functional Regulation of Hybrid MaterialsMinistry of EducationAnhui UniversityHefei 230601China School of Chemistry and Chemical Engineering Anhui UniversityHefei 230601China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

Accessing high-order multiphoton excited fluorescence(H-MPEF)materials is challenging yet and needs complicated synthesis *** this study,we successfully assembled plasmonic Au nanorods(Au NRs)with multiphoton responsive metalorganic frameworks(MOFs),resulting in a significant several-fold enhancement of *** extent of multiphoton enhancement was found to be strongly dependent on the degree of overlap between the multiphoton excitation wavelength of MOFs and the localized surface plasmon resonance absorbance of Au NRs,indicating the importance of plasmon-induced resonance energy ***,plasmon-induced hot electron transfer played a vital role in enhanced multiphoton activity as ***,the optimum H-MPEF enhancement occurs at the second near-infrared(NIR-II)region,which provides a promising platform for fluorescent *** findings provide a feasible and practical method to fabricate optimized H-MPEF materials for biological imaging using tissue-penetrating NIR-II light.

关键词： metal-organic framework(MOF) plasmon resonance multiphoton activity fluorescence imaging

A quantum federated learning framework for classical clients

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

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 1-10页

作者： Yanqi Song Yusen Wu Shengyao Wu dandan li Qiaoyan Wen Sujuan Qin Fei Gao State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 00876China Department of Physics The University of Western AustraliaPerthWA 6009Australia School of Computer Science(National Pilot Software Engineering School) Beijing University of Posts and TelecommunicationsBeijing100876China

Quantum federated learning(QFL)enables collaborative training of a quantum machine learning(QML)model among multiple clients possessing quantum computing capabilities,without the need to share their respective local ***,the limited availability of quantum computing resources poses a challenge for each client to acquire quantum computing *** raises a natural question:Can quantum computing capabilities be deployed on the server instead?In this paper,we propose a QFL framework specifically designed for classical clients,referred to as CC-QFL,in response to this *** each iteration,the collaborative training of the QML model is assisted by the shadow tomography technique,eliminating the need for quantum computing capabilities of ***,the server constructs a classical representation of the QML model and transmits it to the *** clients encode their local data onto observables and use this classical representation to calculate local *** local gradients are then utilized to update the parameters of the QML *** evaluate the effectiveness of our framework through extensive numerical simulations using handwritten digit images from the MNIST *** framework provides valuable insights into QFL,particularly in scenarios where quantum computing resources are scarce.

关键词： client server quantum

Study on the low mechanical anisotropy of extruded Mg-Zn-Mn-Ce-Ca alloy tube in the compression process

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2024年第3期12卷 1054-1067页

作者： dandan li Qichi Le Xiong Zhou Xiaoqiang li Chenglu Hu Ruizhen Guo Tong Wang Ping Wang Wenxin Hu The Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China State Key Laboratory of Baiyunobo Rare Earth Resource Research and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou 014030China

In this study,the extruded Mg-Zn-Mn-Ce-Ca alloy tube with a low compression anisotropy along the ED,45ED and TD was *** effect of the second phases,initial texture and deformation behavior on this low mechanical anisotropy was *** results revealed that the alloy tube contains the high content(Mg1-xZnx)11Ce phase and the low content of Mg12Ce *** second phases are respectively incoherent and coherent with the Mg matrix,and their influence can be ***,the alloy tube exhibited a weak basal fiber texture,where the c-axis was aligned along the 0°∼30°tilt from TD to *** a texture made the initial deformation(at 1.0%∼1.6%strain)of the three samples controlled by comparable basal*** deformation progressed(1.6∼9.0%strain),larger amounts of ETWs nucleated and gradually approached saturation in the three samples,re-orienting the c-axis to a 0°∼±30°deviation with respect to the loading ***,the prismatic and pyramidalslips replaced the dominant deformation progressively until ***,the similar deformation mechanisms determined by the weak initial texture in the three samples contribute to the comparable strain hardening rates,resulting in the low compressive anisotropy of the alloy tube.

关键词： Mg alloy tube Low mechanical anisotropy Weak texture Deformation mechanism.

Identifying and validating MMP family members(MMP2,MMP9,MMP12,and MMP16)as therapeutic targets and biomarkers in kidney renal clear cell carcinoma(KIRC)

在线全文

学校读者我要写书评

暂无评论

Oncology Research 2024年第4期32卷 737-752页

作者： KUNLUN li dandan li BARBOD HAFEZ MOUNIR M.SALEM BEKHIT YOUSEF A.BIN JARDAN FARS KAED ALANAZI EHAB I.TAHA SAYED H.AUDA FAIQAH RAMZAN MUHAMMAD JAMIL The Second Affiliated Hospital of Harbin Medical University Harbin Medical UniversityHarbinChina Department of Pharmaceutical Engineering Jiangsu Ocean UniversityLianyungangChina Department of Biological Engineering University of SalfordSalfordUK Department of Pharmaceutics College of PharmacyKing Saud UniversityRiyadhSaudi Arabia Department of Animal and Poultry Production Faculty of Veterinary and Animal SciencesGomal UniversityDera Ismail KhanPakistan Department of Arid Zone Research PARC instituteDera Ismail KhanPakistan

Kidney Renal Clear Cell Carcinoma(KIRC)is a malignant tumor that carries a substantial risk of morbidity and *** MMP family assumes a crucial role in tumor invasion and *** study aimed to uncover the mechanistic relevance of the MMP gene family as a therapeutic target and diagnostic biomarker in Kidney Renal Clear Cell Carcinoma(KIRC)through a comprehensive approach encompassing both computational and molecular ***,Cytoscape,UALCAN,GEPIA,OncoDB,HPA,cBioPortal,GSEA,TIMER,ENCORI,DrugBank,targeted bisulfite sequencing(bisulfite-seq),conventional PCR,Sanger sequencing,and RT-qPCR based analyses were used in the present study to analyze MMP gene family members to accurately determine a few hub genes that can be utilized as both therapeutic targets and diagnostic biomarkers for *** performing STRING and Cytohubba analyses of the 24 MMP gene family members,MMP2(matrix metallopeptidase 2),MMP9(matrix metallopeptidase 9),MMP12(matrix metallopeptidase 12),and MMP16(matrix metallopeptidase 16)genes were denoted as hub genes having highest degree *** analyzing MMP2,MMP9,MMP12,and MMP16 via various TCGA databases and RT-qPCR technique across clinical samples and KIRC cell lines,interestingly,all these hub genes were found significantly overexpressed at mRNA and protein levels in KIRC samples relative to *** notable effect of the up-regulated MMP2,MMP9,MMP12,and MMP16 was also documented on the overall survival(OS)of the KIRC ***,targeted bisulfite-sequencing(bisulfite-seq)analysis revealed that promoter hypomethylation pattern was associated with up-regulation of hub genes(MMP2,MMP9,MMP12,and MMP16).In addition to this,hub genes were involved in various diverse oncogenic *** MMP gene family members(MMP2,MMP9,MMP12,and MMP16)may serve as therapeutic targets and prognostic biomarkers in KIRC.

关键词： KIRC MMP gene family Chemotherapy Overall survival

国家审计、非效率投资与制造业企业全要素生产率

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

审计与经济研究 2024年第3期39卷 11-19页

作者：李丹丹李笑迎西北政法大学商学院陕西西安710122

基于2010—2018年审计署实施中央企业审计事件样本,采用多时点双重差分模型考察国家审计对制造业企业TFP的影响效应和机制以及非效率投资的作用路径。研究发现,国家审计显著促进了制造业企业TFP的提升,这种提升主要是通过缓解代理问题... 详细信息

基于2010—2018年审计署实施中央企业审计事件样本,采用多时点双重差分模型考察国家审计对制造业企业TFP的影响效应和机制以及非效率投资的作用路径。研究发现,国家审计显著促进了制造业企业TFP的提升,这种提升主要是通过缓解代理问题和抑制高管超额在职消费发挥作用的。非效率投资在国家审计对制造业企业TFP影响过程中发挥了部分中介效应,即抑制非效率投资是国家审计促进企业TFP提升的重要作用路径。进一步地,二次审计正向调节了国家审计对企业TFP的影响效应。国家审计的促进作用在非效率投资程度高的企业中更为显著,且主要缓解了制造业企业投资不足问题。研究结论为微观企业借助审计监督力量更好实现经济高质量发展、优化审计治理机制提供了路径参考。

关键词：国家审计非效率投资制造业企业全要素生产率经济监督双重差分模型代理问题高管超额在职消费

企业数字化程度促进双元创新了吗?——基于知识多样性视角分析

在线全文

学校读者我要写书评

暂无评论

商业研究 2024年第3期 125-133页

作者：李玉花李丹丹浙江财经大学经济学院杭州310018

数字技术已成为一种新型生产要素,明确其在企业生产运营的应用与创新的关系具有重要理论价值和现实意义。本文以2007—2021年中国A股上市公司为研究样本,探讨企业数字化程度对渐进式创新和突破式创新的差异化影响。研究发现:企业数字化... 详细信息

数字技术已成为一种新型生产要素,明确其在企业生产运营的应用与创新的关系具有重要理论价值和现实意义。本文以2007—2021年中国A股上市公司为研究样本,探讨企业数字化程度对渐进式创新和突破式创新的差异化影响。研究发现:企业数字化程度通过增强行业内知识多样性促进了渐进式创新,但对突破式创新的影响并不显著;企业员工教育水平和专业化分工程度均增强了企业数字化程度对渐进式创新的正向影响,但并不调节企业数字化程度和突破式创新之间的关系;高盈利能力企业和竞争性行业的企业数字化程度能够促进渐进式创新,但不影响突破式创新;管制性行业的企业数字化程度抑制了突破式创新,且对渐进式创新的影响不明显。

关键词：企业数字化程度知识多样性渐进式创新突破式创新

资源三号03星立体影像与激光测高点联合区域网平差处理及精度验证

在线全文

学校读者我要写书评

暂无评论

遥感学报 2024年第4期28卷 1089-1100页

作者：周平唐新明李丹丹王霞自然资源部国土卫星遥感应用中心北京100048 清华大学地球系统科学系北京100084

利用国产卫星影像开展全球范围地理信息资源建设的前提条件之一是提升卫星影像无地面控制条件下几何精度水平。2020年7月成功发射资源三号03星(ZY3-03)是资源三号系列卫星中的第3颗高分辨率立体测绘卫星,主要用于全球范围1∶5万比例尺... 详细信息

利用国产卫星影像开展全球范围地理信息资源建设的前提条件之一是提升卫星影像无地面控制条件下几何精度水平。2020年7月成功发射资源三号03星(ZY3-03)是资源三号系列卫星中的第3颗高分辨率立体测绘卫星,主要用于全球范围1∶5万比例尺测图应用。卫星搭载了3台全色线阵推扫式光学相机和一台多光谱相机,可获取优于2.5 m分辨率的三线阵立体影像和5.8 m分辨率的多光谱影像。为了提升卫星影像的高程精度,卫星还设计搭载了一台单波束激光测高仪,可同步获取高精度激光测高点。本文提出了一种ZY3-03星激光测高点与立体影像联合区域网平差处理方法。利用激光测高点和同轨获取的正视影像相对平面误差较小的特性,准确获取激光测高点在立体影像上的像方位置;将激光测高点作为立体影像高程控制,并以整轨立体影像为单位开展立体影像与激光测高点的联合区域网平差,实现立体影像高程精度大幅提升。选取黑龙江省中部地区和河北省太行山地区的ZY3-03星三线阵立体影像及其同轨获取的激光测高点开展联合区域网平差试验,结果表明,平地和丘陵地形区域的ZY3-03星立体影像的高程中误差从5.27 m降低至2.58 m,山地地形区域的ZY3-03立体影像的高程中误差从11.25 m降低至4.45 m,均能满足中国1∶5万比例尺立体测图的精度要求。

关键词：遥感资源三号03星三线阵立体影像激光测高点联合区域网平差几何精度

不同柑橘类果胶分子的理化特性、结构及凝胶性能

在线全文

学校读者我要写书评

暂无评论

农业工程学报 2024年第14期40卷 240-249页

作者：李丹丹韦惠莹齐军茹华南理工大学食品科学与工程学院小麦和玉米国家工程研究中心

为了解不同果胶的理化性质、结构与其功能特性的区别，拓展不同性能果胶的针对化应用，提高柑橘加工副产物的附加值。该研究采用酸提法从上饶柚子皮、赣南脐橙皮、南丰蜜桔皮、日本柚子皮、小青柑皮、柠檬皮6种柑橘类水果果皮渣中分别... 详细信息

为了解不同果胶的理化性质、结构与其功能特性的区别，拓展不同性能果胶的针对化应用，提高柑橘加工副产物的附加值。该研究采用酸提法从上饶柚子皮、赣南脐橙皮、南丰蜜桔皮、日本柚子皮、小青柑皮、柠檬皮6种柑橘类水果果皮渣中分别提取果胶，依次为HMP-1、HMP-2、HMP-3、HMP-4、HMP-5和HMP-6，并对其理化特性、结构及凝胶性能进行比较分析。结果表明：不同来源的6种柑橘果胶酯化度在67.20%～75.45%，均为高酯果胶（high methoxyl pectin, HMP），具备阴离子多糖特性，在提取过程中均出现了不同程度的降解，理化特性和分子结构上存在一定差别。果胶的分子量、黏度、分子链结构等因素共同作用于果胶的凝胶性能，6种HMP均能形成具有一定强度的酸/糖凝胶，将水分截留在三维凝胶网络中，经历冻融循环过程持水性仍在96%以上，具备较好的稳定性。其中分子量较低的HMP-1和HMP-6凝胶强度最高，胶凝度均在200°以上，这与HMP-1的高同型半乳糖醛酸聚糖（HG）含量、较完整的分子结构，以及HMP-6较高的鼠李糖半乳糖醛酸聚糖-I(RG-I)含量及分支度有关，而分子量及黏度较高的HMP-5的弱凝胶强度则与其较大的分子链降解程度及低RG-I含量有关，表明HG和RG-I结构域对凝胶的形成均有促进作用。原子力显微镜图像也显示，HMP-1和HMP-6中出现较为明显的分子链交联。对不同柑橘类果胶的理化性质、结构与凝胶特性进行比较分析，为筛选凝胶性能更加优异的提取原料、果胶的扩大化生产及针对性应用提供了理论参考。

关键词：柑橘类水果理化性质凝胶特性结构表征高酯果胶