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基于偏移补偿模型的大曲率复杂芯模编织牵引轨迹优化控制方法

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航空制造技术 2024年第8期67卷 85-91,109页

作者：陈浩刘月刚李麒阳郗欣甫陈冰冰东华大学上海201620

针对大曲率复杂芯模编织过程中机器人示教困难、织物编织角不稳定等问题,提出一种基于偏移补偿模型的编织牵引轨迹优化控制方法。首先基于不稳定编织阶段收敛距离的变换,建立预成型编织点预测模型;其次对芯模进行离散化处理,调整每一段... 详细信息

针对大曲率复杂芯模编织过程中机器人示教困难、织物编织角不稳定等问题,提出一种基于偏移补偿模型的编织牵引轨迹优化控制方法。首先基于不稳定编织阶段收敛距离的变换,建立预成型编织点预测模型;其次对芯模进行离散化处理,调整每一段离散芯模的轴线垂直通过动态编织点平面,修正每段芯模编织进给长度,利用芯模变截面过程的不稳定编织阶段进行芯模姿态调整,同时调整不稳定阶段牵引速度以更快达到稳定编织状态。试验结果表明,该轨迹优化方法能有效避免大曲率复杂芯模预成型体的纱线堆积和编织角波动范围大的问题,能够提高预成型体编织质量。

关键词：编织机牵引轨迹离散化编织点平面牵引速度

归芪白术方不同给药方式通过调节水液代谢改善放射性肠水肿

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中华中医药杂志 2024年第7期39卷 3743-3748页

作者：李洋洋张利英刘永琦杨更强张尚祖李启杨王欣苏海翔甘肃中医药大学重大疾病分子医学与防治研究省级重点实验室兰州730000 甘肃中医药大学敦煌医学与转化教育部重点实验室兰州730000 甘肃省肿瘤医院甘肃省医学科学研究院兰州730050

目的:探讨归芪白术方预防性和治疗性给药对放射性肠水肿的保护作用及机制。方法:选择SD大鼠,运用6GyX射线腹部照射建立放射性肠水肿模型,并进行预防性和治疗性给药干预。预防性给药:30只SD大鼠随机分为空白组、模型组和归芪白术方组,每... 详细信息

目的:探讨归芪白术方预防性和治疗性给药对放射性肠水肿的保护作用及机制。方法:选择SD大鼠,运用6GyX射线腹部照射建立放射性肠水肿模型,并进行预防性和治疗性给药干预。预防性给药:30只SD大鼠随机分为空白组、模型组和归芪白术方组,每组10只;治疗性给药:120只SD大鼠分为治疗后3d和14d,各60只,随机分为空白组、模型组、纯药组、低剂量组、中剂量组和高剂量组,每组10只。观察大鼠一般状况;检测结肠组织干、湿重;HE染色观察结肠组织形态变化;透射电镜观察结肠组织超微结构;免疫荧光检测结肠组织活性氧(ROS)、缺氧诱导因子1α(HIF-1α)和水通道蛋白4(AQP4)的表达;WesternBlot检测结肠组织AQP4和Na^(+)-K^(+)-ATPase蛋白表达。结果:与空白组比较,模型组结肠组织形态和超微结构出现明显破坏,结肠组织含水量显著升高(P<0.01);ROS、HIF-1α和AQP4表达显著升高(P<0.01);Na^(+)-K^(+)-ATPase蛋白表达显著降低(P<0.01)。与模型组比较,归芪白术方给药(照射前14d,照射后3、14d)干预后,结肠组织形态和超微结构破坏明显好转,归芪白术方治疗性给药3d后,各剂量组结肠组织含水量显著降低(P<0.05,P<0.01);归芪白术方治疗性给药3、14d后,各剂量组ROS、HIF-1α和AQP4表达显著降低(除治疗3d后低剂量组HIF-1α外)(P<0.01),Na^(+)-K^(+)-ATPase蛋白表达显著升高(P<0.01,P<0.05)。结论:无论是预防性还是治疗性给药,归芪白术方均可以有效改善放射性肠水肿,其机制可能是改善缺氧和氧化应激,调控AQP4和Na^(+)-K^(+)-ATPase的表达来实现的。

关键词：水液代谢归芪白术方预防性给药治疗性给药放射性肠水肿机制水通道蛋白4 Na^(+)-K^(+)-ATPase

Preparation of Rectorite-TiO_2 and Its Application in the Solar Photocatalytic Degradation of Dye Wastewater

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Wuhan University Journal of Natural Sciences 2007年第2期12卷 367-371页

作者： DENG Deming NIE qiyang CHENG Kang li Fugui GAN Fuxing School of Resource and Environmental Science WuhanUniversity Wuhan 430079 Hubei China

A photocatalyst consisting of TiO2 powder and rectorite was prepared and activated utilizing solar light and used for degradation of simulated dye wastewater （methyl solution）. The effects of roasting temperature, the way of adding rectorite, and the amount of the rectorite on the photocatalytic activity have been investigated. The results indicated that rectorite-TiO2 photocatalyst prepared with the right proportional amount of rectorite and titanium dioxide, could effectively degrade the methyl orange solution in sunlight. After reacting in sunlight for 8 hours, the methyl orange decolorization reached 96%. The photocatalytic activity of rectorite-TiO2 was much better than that of TiO2 in sunlight.

关键词： rectorite titanium dioxide photocatalytic activity solar light

MODIFICATION EFFECT OF Sr ON Al-Si ALLOYS

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Acta Metallurgica Sinica(English Letters) 1990年第7期3卷 23-27页

作者： liU qiyang li Qingchun ZHANG Jiren Harbin Institute of Technology,Harbin,China liU qiyang,Division of Foundry,Department of Mechanical Engineering No.2,South China University of Technology,Guangzhou,China

By inserting the single crystal silicon seeds into Sr modified Al-22wt-% Si alloy melts,the fact that nucleation and growth of Si-phase are affected by Sr addition has been *** is suggested that this effect is caused by the adsorption of Sr on{111}_(si),and the modification of eutectic structure results from the variation of leading phase in the eutectic from Si to α-Al.

关键词： Al-Si alloy Sr modification

A Method for Evaluating the Performance of Unmanned Aerial Navigation Systems Based on Fuzzy Decision Trees

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A Method for Evaluating the Performance of Unmanned Aerial N...

DESIGN,CONSTRUCTION AND OPERATION MANAGEMENT OF KONGQUEGOU ARTIFICIAL AGGREGATE PREPARATION SYSTEM FOR XIAOWAN HYDROPOWER PLANT

第十三届中国卫星导航年会

作者： Changyuan Chen Chunlin Shi Teng liu Haojie li qiyang li li Ma Information Engineering University Northwestern Polytechnical University Changchun University of Science and Technology

In the process of application, unmanned aerial vehicles（UAVs） are faced with the threat of a complex electromagnetic environment, causing the airborne navigation system to fail to achieve ideal working conditions, and seriously restricting the overall effectiveness of the UAV system. Therefore, accurate assessment of UAV navigation system performance is an important prerequisite for scientific decision-making on the use of UAVs in complex environments in the future. In system design and experimentation, the more realistic electromagnetic interference environments that UAVs may be exposed to are difficult to build, resulting in insufficient data being collected to verify UAV navigation system performance. However, as real data from UAVs is continuously accumulated in various application scenarios at a later stage, it is necessary to explore a data mining-based method for UAV navigation system performance evaluation. In this study, a decision tree algorithm was used to construct a UAV navigation performance level classification assessment model. UAV performance was analysed through UAV navigation capability and survivability indicators. Finally, simulation experiments were conducted to further develop the construction and testing of the decision tree model. The experimental results showed that the model accuracy is above 90%, validating the feasibility of the method.

关键词： UAV Navigation Electromagnetic Environment Performance Evaluation Data Mining Decision Tree Algorithm

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DESIGN,CONSTRUCTION AND OPERATION MANAGEMENT OF KONGQUEGOU A...

产品与物流服务双维竞争下品牌商的跨境包邮策略研究

水电2006国际研讨会

作者： li Jianfeng li qiyang Zhu Xiaomin Xiaowan Project Construction Agency Sinohydro Engineering Bureau 8 675702

Kongquegou Artificial Aggregate Preparation System for the Xiaowan Hydropower Plant is the second largest of this type built in complicated geological conditions and narrow spaces in China. This system is large in capacity and synthetic in technology, representing high requirements for the quality and adjustability of finished aggregate. As limited by the field and geological conditions, the regulation capacity of all workshops is relatively small, which represents a high degree of difficulty in design, construction and operation management. As proven by operation over a year or so, the system is operating normally.

关键词： Artificial Aggregate Preparation System Design Construction Operation Management

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系统工程理论与实践 2022年第4期42卷 1013-1025页

作者：牛保庄陈凌云李启洋华南理工大学工商管理学院广州510641

在跨境电商中,包邮服务连同产品价格对消费者购买决策产生共同影响.当品牌商提供包邮时,它将一并承担跨境运费和进口关税;否则,这些费用将由消费者支付.基于此,本文考虑产品和物流服务双维竞争,针对同一跨境电商平台中品牌商A和B的包邮... 详细信息

在跨境电商中,包邮服务连同产品价格对消费者购买决策产生共同影响.当品牌商提供包邮时,它将一并承担跨境运费和进口关税;否则,这些费用将由消费者支付.基于此,本文考虑产品和物流服务双维竞争,针对同一跨境电商平台中品牌商A和B的包邮(F)或不包邮(N)决策,构建了四种策略组合下的模型,探讨品牌商的包邮策略选择问题.对比不同策略组合下的均衡结果,发现物流服务费用差异及产品差异对品牌商的决策起决定性作用.当产品差异较大时,品牌商A和B之间将出现(N,N)、(N,F)、(F,F)三种均衡策略,具体均衡策略的出现由消费者直接承担的物流服务费用决定.反之,当产品差异较小时,二者的均衡策略为(N,N)、(F,F).本文还发现关税税率的变化将会显著影响各种均衡策略形成的可能性,关税税率提高驱使品牌商选择趋同的包邮策略,即(N,N)、(F,F)更可能出现.这体现出跨境场景中关税对企业决策的独特作用.

关键词：双维竞争进口关税跨境包邮均衡策略

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大尺寸异形结构芯模编织策略及纱线轨迹预测

纺织学报 2023年第10期44卷 188-195页

作者：李麒阳季诚昌郗欣甫孙以泽东华大学机械工程学院上海201620

针对大尺寸异形结构芯模在编织过程中牵引轨迹精度低、编织角误差大等问题,提出一种基于双机器人协同夹持芯模进行编织的轨迹求解方法,并预测纱线轨迹。首先求解第1台机器人轨迹保证任意一段离散芯模垂直通过编织平面,再利用几何约束求... 详细信息

针对大尺寸异形结构芯模在编织过程中牵引轨迹精度低、编织角误差大等问题,提出一种基于双机器人协同夹持芯模进行编织的轨迹求解方法,并预测纱线轨迹。首先求解第1台机器人轨迹保证任意一段离散芯模垂直通过编织平面,再利用几何约束求解第2台机器人轨迹,然后提出针对该机器人轨迹的纱线预测模型,预测任意时刻纱线落在芯模上的位置。实验结果表明:使用本文求解的机器人轨迹进行编织可使芯模等截面部分编织角与期望值的误差在±3°以内,弯曲变截面部分的误差在±7°以内;预测模型的结果与实际测量编织角的等截面部分误差在±3°以内,弯曲变截面部分的误差在±5°以内。

关键词：复合材料大尺寸芯模环形编织编织角牵引轨迹纱线轨迹预测

Schizophrenia-associated rs4702 G allele-specific downregulation of FURIN expression by miR-338-3p reduces BDNF production

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Schizophrenia-associated rs4702 G allele-specific downregula...