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Investigation on thermal characteristics and desensitization mechanism of improved step ladder-structured nitrocellulose

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Defence Technology（防务技术） 2023年第2期20卷 93-102页

作者： Cheng-kai Pu Yu luan Ming-jun yi Zheng-gang Xiao Key Laboratory of Special Energy Materials Ministry of EducationSchool of Chemistry and Chemical EngineeringNanjing University of Science and TechnologyNanjing210094People's Republic of China

Nitrocellulose,or cellulose nitrate,has received considerable interest due to its various applications,such as propellants,coating agents and gas ***,its high mechanical sensitivity caused many accidents during its storage and usage in *** this work,two kinds of insensitive step ladderstructured nitrocellulose(LNC)with different nitrogen contents were *** products were characterized by FT-IR,Raman,XRD,SEM,elemental analysis,TGA,DSC,accelerating rate calorimeter analysis(ARC),and drop weight test to study their molecular structure,thermal characteristics and desensitization *** with raw nitrocellulose,LNC has a sharper exothermic peak in the DSC and ARC *** H50values of the two kinds of LNC increased from 25.76 to 30.01 cm for low nitrogen content and from 18.02 to 21.84 cm for high nitrogen content,*** results show that the ladder-structure of LNC which provides regular molecular arrangement and a soft buffer made with polyethylene glycol could affect the energy releasing process of LNC and reduce the sensitivity of *** LNC provides an alternative to be used as a binder in insensitive propellants formulation.

关键词： Nitrocellulose Decomposition Desensitization Ladder structure Thermal characteristic Polyethylene glycol

Towards reinforcement learning in UAV relay for anti-jamming maritime communications

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Digital Communications and Networks 2023年第6期9卷 1477-1485页

作者： Chuhuan Liu yi Zhang Guohang Niu Luliang Jia Liang Xiao Jiangxia luan Department of Information and Communication Engineering Xiamen UniversityXiamen361005China School of Space Information Space Engineering UniversityBeijing101400China Xiamen Meiya Pico Information Co. Ltd.Xiamen361005China

Maritime communications with sea surface reflections and sea wave occlusions are susceptible to jamming attacks due to the wide geographical area and intensive wireless communication *** Aerial Vehicles(UAVs)help relay messages to improve communication performance,but the relay policy that depends on the rapidly changing maritime environments is difficult to *** this paper,a reinforcement learning-based UAV relay policy for maritime communications is proposed to resist jamming *** on previous transmission performance,the relay location,the received power of the transmitted signal and the received jamming power,this scheme optimizes the UAV trajectory and relay power to save the energy consumption and decrease the Bit-Error-Rate(BER)of the maritime signals.A deep reinforcement learning-based scheme is also proposed,which designs a deep neural network with dueling architecture to further improve the communication performance and computational *** performance bounds regarding the signal to interference plus noise ratio,energy consumption and the communication utility are provided based on the Nash equilibrium of the game against jamming,and the computational complexity of the proposed schemes is *** results show that the proposed schemes improve the energy efficiency and decrease the BER compared with the benchmark.

关键词： Maritime communications Jamming Unmanned aerial vehicle Relay Reinforcement learning

补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效

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中成药 2024年第2期46卷 458-465页

作者：杨晔颖何东仪薛鸾于盈盈程鹏孙宇苏励上海中医药大学附属龙华医院上海200032 上海光华中西医结合医院上海200030 上海中医药大学附属岳阳中西医结合医院上海200437 青浦区中医医院上海201700

目的探讨补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效。方法 167例患者随机分为对照组(常规治疗,55例)、暴露组(常规治疗+补肾活血汤剂,54例)、高暴露组(常规治疗+补肾活血汤剂+补肾活血膏方,58例),疗程2年。检测临床疗效、BA... 详细信息

目的探讨补肾活血膏方对肾虚血瘀证强直性脊柱炎患者的临床疗效。方法 167例患者随机分为对照组(常规治疗,55例)、暴露组(常规治疗+补肾活血汤剂,54例)、高暴露组(常规治疗+补肾活血汤剂+补肾活血膏方,58例),疗程2年。检测临床疗效、BASDAI评分、ASDAS-CRP、BASFI评分、脊柱痛评分、PGA评分、BASMI评分、ASQoL评分、SPARCC评分、肾虚血瘀证评分、ESR、CRP、IL-6、TNF-α、IL-17、IL-23、IL-35、NLR、PLR、安全性指标变化。结果高暴露组ASAS40、ASAS5/6、BASDAI50例数多于暴露组和对照组(P<0.05)。治疗后,高暴露组BASDAI评分、ASDAS-CRP、BASFI评分、脊柱痛评分、PGA评分、BASMI评分、SPARCC评分、ASQoL评分、肾虚血瘀证评分、ESR、CRP、IL-6、TNF-α、IL-17、IL-23低于其他2组(P<0.05),IL-35更高(P<0.05)。经Logistic回归分析校正混杂因素后,补肾活血汤、补肾活血膏方降低BASDAI评分和ASDAS-CRP(P<0.05),提高临床疗效(P<0.05)。3组未发现严重不良反应。结论补肾活血膏方可安全有效地抑制肾虚血瘀证强直性脊柱炎患者炎症,降低疾病活动度,减轻骨髓水肿,改善临床症状,提高关节功能和生活质量。

关键词：补肾活血膏方常规治疗补肾活血汤强直性脊柱炎肾虚血瘀

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立式轴流泵装置内流瞬变特性数值分析

水资源与水工程学报 2024年第4期35卷 111-118页

作者：徐贵颖王暴王振华栾逸单秋雯杨帆扬州大学水利科学与工程学院江苏扬州225009 宿迁市湖滨新区农村工作局江苏宿迁223800 江苏省水利勘测设计研究院有限公司江苏扬州225127

为明确立式轴流泵装置内流瞬态变化特性,采用计算流体动力学(CFD)方法求解泵装置全流道内流场,并结合物理模型试验验证数值模拟的可靠性,得到不同流量工况下泵装置叶片区的瞬态流动特性。结果表明:叶轮进口偏流角较大的区域主要集中于... 详细信息

为明确立式轴流泵装置内流瞬态变化特性,采用计算流体动力学(CFD)方法求解泵装置全流道内流场,并结合物理模型试验验证数值模拟的可靠性,得到不同流量工况下泵装置叶片区的瞬态流动特性。结果表明:叶轮进口偏流角较大的区域主要集中于叶轮前缘附近且随叶轮旋转呈动态变化,叶轮出口偏流角由轮毂向轮缘逐渐增大,导叶体出口偏流角较大的区域为导叶片尾缘周向位置。1.2 Q_(bep)工况时,叶轮进口轴向速度分布均匀度为89.5%,速度加权平均角为82.9°;当流量从0.8 Q_(bep)增加至1.2 Q_(bep)时,导叶体出口平均速度环量降低了12.1%;在流量工况为0.8 Q bep~1.2 Q_(bep)范围内,平均速度环量的最小值为4.7 m^(2)/s,此时流量为1.2 Q_(bep)。导叶体出口的涡结构特征显著,从导叶体进口到出口涡结构数量增多,涡体积减小,涡结构的合速度降低显著。

关键词：轴流泵泵装置叶片内流场瞬态特性数值分析

GNNSched:面向GPU的图神经网络推理任务调度框架

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计算机工程与科学 2024年第1期46卷 1-11页

作者：孙庆骁刘轶杨海龙王一晴贾婕栾钟治钱德沛北京航空航天大学计算机学院北京100191

由于频繁的显存访问,图神经网络GNN在GPU上运行时往往资源利用率较低。现有的推理框架由于没有考虑GNN输入的不规则性,直接适用到GNN进行推理任务共置时可能会超出显存容量导致任务失败。对于GNN推理任务,需要根据其输入特点预先分析并... 详细信息

由于频繁的显存访问,图神经网络GNN在GPU上运行时往往资源利用率较低。现有的推理框架由于没有考虑GNN输入的不规则性,直接适用到GNN进行推理任务共置时可能会超出显存容量导致任务失败。对于GNN推理任务,需要根据其输入特点预先分析并发任务的显存占用情况,以确保并发任务在GPU上的成功共置。此外,多租户场景提交的推理任务亟需灵活的调度策略,以满足并发推理任务的服务质量要求。为了解决上述问题,提出了GNNSched,其在GPU上高效管理GNN推理任务的共置运行。具体来说,GNNSched将并发推理任务组织为队列,并在算子粒度上根据成本函数估算每个任务的显存占用情况。GNNSched实现了多种调度策略来生成任务组,这些任务组被迭代地提交到GPU并发执行。实验结果表明,GNNSched能够满足并发GNN推理任务的服务质量并降低推理任务的响应时延。

关键词：图神经网络图形处理器推理框架任务调度估计模型

肿瘤定量参数对VI-RADS评分系统评估膀胱癌的辅助价值

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中华腔镜泌尿外科杂志（电子版） 2024年第1期18卷 41-45页

作者：张逸张继栾成明张传猛南京医科大学附属泰州人民医院影像科江苏泰州225300 泰州市第三人民医院影像科南京医科大学附属泰州人民医院临床研究中心江苏泰州225300

目的评估VI-RADS评分系统的准确性,以及肿瘤的定量参数对VI-RADS评分系统评估膀胱癌的辅助价值。方法回顾性分析泰州市人民医院79例经病理证实的膀胱癌病例资料,以病理结果为标准,分析VI-RADS评估膀胱癌肌层浸润的准确性。按照病理结果... 详细信息

目的评估VI-RADS评分系统的准确性,以及肿瘤的定量参数对VI-RADS评分系统评估膀胱癌的辅助价值。方法回顾性分析泰州市人民医院79例经病理证实的膀胱癌病例资料,以病理结果为标准,分析VI-RADS评估膀胱癌肌层浸润的准确性。按照病理结果有无肌层浸润将患者分为两组,测量膀胱癌病灶的表观扩散系数(ADC)值、肿瘤-膀胱壁接触长度(TCL)、肿瘤最大径、病灶周长,分析每个定量参数对肌层浸润的诊断效能,以及与肿瘤分期的相关性。结果VI-RADS评分诊断浸润性膀胱癌的ROC曲线下面积(AUC)为0.925(95%CI:0.863~0.986,P<0.05),取≥4分作为诊断标准时,约登指数最大为0.651,敏感度为68.4%,特异度为96.7%;膀胱癌的ADC值、TCL、肿瘤最大径、病灶周长诊断肌层浸润的AUC分别为0.822,0.865,0.799,0.796,敏感度为76.5%,70.6%,70.6%,76.5%,特异度为84.9%,94.3%,90.6%,90.6%,VI-RADS评分联合各参数诊断肌层浸润的AUC为0.980,敏感度100%,特异度86.8%;膀胱癌的ADC值、TCL、肿瘤最大直径、病灶周长与肿瘤分期具有明显相关性。结论膀胱癌的ADC值、TCL、肿瘤最大径、病灶周长可以一定程度诊断膀胱癌有无肌层浸润,对VI-RADS评分系统进行补充其中TCL的诊断价值最大。

关键词：膀胱癌图像分析 VI-RADS ADC值 TCL 肿瘤最大径

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基于多元宇宙融合算法的船舶电网重构研究

船电技术 2024年第5期44卷 9-14页

作者：刘伟刘桓伯栾泳立郭燚上海船舶运输科学研究所有限公司上海200135 上海海事大学物流工程学院上海201306

本文提出了一种基于改进的多元宇宙(Multi-Verses Optimization, MVO)和优劣距离法(Technique for Order Preference by Similarity to Ideal Solution,TOPSIS)融合算法的船舶电力系统故障重构方法。在多元宇宙算法基础上引入变异操作,融合TOPSIS算法,对多个宇宙的适应度进行评价,选出最优个体。通过实例分析和仿真验证表明,所提出的算法不易陷入局部最优,收敛速度快,在求解船舶电力系统故障重构问题上具有较强的优越性。

关键词：船舶中压直流电力系统故障重构多元宇宙算法优劣距离法

海藻酸钠与刺槐豆胶协同作用对绿豆淀粉的短期和长期老化影响

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粮油食品科技 2024年第4期32卷 112-120页

作者：栾茜玉陈妍张一秀王雨生于真陈海华青岛农业大学食品科学与工程学院山东青岛266109 青岛农业大学巴瑟斯未来农业科技学院山东青岛266109

以海藻酸钠(SA)、刺槐豆胶(LBG)和绿豆淀粉(MBS)为原料,采用动态流变仪、质构仪、差示扫描量热仪、X-射线衍射仪和低场核磁共振仪探究了SA、LBG及不同复配比例的SA-LBG混合物对MBS老化的影响及其影响机理。结果显示,添加SA、LBG和SA-LB... 详细信息

以海藻酸钠(SA)、刺槐豆胶(LBG)和绿豆淀粉(MBS)为原料,采用动态流变仪、质构仪、差示扫描量热仪、X-射线衍射仪和低场核磁共振仪探究了SA、LBG及不同复配比例的SA-LBG混合物对MBS老化的影响及其影响机理。结果显示,添加SA、LBG和SA-LBG混合物均能降低老化MBS凝胶的硬度、老化焓值、重结晶速率常数(k)、相对结晶度和水的流动性,提高其损失因子。低场核磁共振结果发现SA-LBG混合物提高了MBS凝胶的自旋-自旋弛豫时间(T_(2))。SA、LBG和SA-LBG混合物均能延缓MBS凝胶老化,其中SA-LBG混合物抗老化效果更显著。当SA与LBG以1∶1质量比复配时,SA-LBG混合物具有最强的协同作用,能有效抑制淀粉老化。这主要是由于SA与LBG的协同作用及SA、LBG和淀粉之间的氢键和静电相互作用均能减缓淀粉分子之间的相互作用,抑制淀粉的重结晶。为引入SA-LBG复合物提高MBS基食品品质提供一定的理论依据。

关键词：绿豆淀粉老化海藻酸钠刺槐豆胶协同作用

10B-doped MCP detector developed for neutron resonance imaging at Back-n white neutron source

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Nuclear Science and Techniques 2024年第8期35卷 58-68页

作者： Qiang Li Li‑Jiao Wang Jing‑Yu Tang Xiang‑Biao Qiu Zhen Chen Mao‑Yuan Zhao Chang‑Jun Ning Kai Pan Wei Xu Tao Li Su‑Peng Lu Han yi Rui‑Rui Fan Chang‑Qing Feng Rong Zhang Xiao‑Yang Sun Qi An Hao‑Fan Bai Jiang‑Bo Bai Jie Bao Ping Cao Qi‑Ping Chen Yong‑Hao Chen Zeng‑Qi Cui An‑Chuan Fan Fan‑Zhen Feng Min‑Hao Gu Chang‑Cai Han Zi‑Jie Han Guo‑Zhu He Yong‑Cheng He Yang Hong yi‑Wei Hu Han‑Xiong Huang Wei Jiang Zhi‑Jie Jiang Zheng‑Yao Jin Ling Kang Bo Li Gong Li Xiao Li Yang Li Jie Liu Rong Liu Shu‑Bin Liu yi‑Na Liu Guang‑Yuan luan Jie Ren Zhi‑Zhou Ren Xi‑Chao Ruan Zhao‑Hui Song Kang Sun Zhi‑Xin Tan Sheng‑Da Tang Jin‑Cheng Wang Peng‑Cheng Wang Zhao‑Hui Wang Zhong‑Wei Wen Xiao‑Guang Wu Xuan Wu Cong Xia Yong‑Ji Yu Guo‑Hui Zhang Hang‑Chang Zhang Lin‑Hao Zhang Qi‑Wei Zhang Xian‑Peng Zhang Yu‑Liang Zhang Yue Zhang Zhi‑Yong Zhang Zhi‑Hao Zhou Ke‑Jun Zhu Chong Zou Institute of High Energy Physics Chinese Academy of Sciences(CAS)Beijing 100049China Spallation Neutron Source Science Center Dongguan 523803China State Key Laboratory of Particle Detection and Electronics Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Dongguan Songshan Lake Future School Dongguan 523808China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China North Night Vision Science and Technology(Nanjing)Research Institute Co.Ltd Nanjing 211106China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China Institute of Modern Physics Fudan UniversityShanghai 200433China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China China Academy of Engineering Physics Institute of Nuclear Physics and ChemistryMianyang 621900China USTC archaeometry lab University of Science and Technology of ChinaHefei 230026China Northwest Institute of Nuclear Technology Xi’an 710024China University of Chinese Academy of Sciences Beijing 100049China China Shipbuilding Trading Co. LtdBeijing 100044China

Neutron resonance imaging(NRI)has recently emerged as an appealing technique for neutron *** complexity surpasses that of conventional transmission imaging,as it requires a high demand for both a neutron source and ***,the progression of NRI technology has been sluggish since its inception in the 1980s,particularly considering the limited studies analyzing the neutron energy range above *** white neutron source(Back-n)at the China Spallation Neutron Source(CSNS)provides favorable beam conditions for the development of the NRI technique over a wide neutron energy range from eV to ***-sensitive microchannel plates(MCP)have emerged as a cutting-edge tool in the field of neutron detection owing to their high temporal and spatial resolutions,high detection efficiency,and low *** this study,we report the development of a 10B-doped MCP detector,along with its associated electronics,data processing system,and NRI experiments at the *** heavy elements such as gold,silver,tungsten,and indium can be easily identified in the transmission images by their characteristic resonance peaks in the 1–100 eV energy range;the more difficult medium-weight elements such as iron,copper,and aluminum with resonance peaks in the 1–100 keV energy range can also be *** particular,results in the neutron energy range of dozens of keV(Aluminum)are reported here for the first time.

关键词： Neutron resonance imaging 10B doped MCP detector White neutron source Sample nuclide identification