检索结果-南通市图书馆

Computer Modeling in Engineering & Sciences 2023年第5期135卷 1521-1538页

作者： Zihang Li zexin wang Zi wang Zijun Qin Feng Liu Liming Tan Xiaochao Jin Xueling Fan Lan Huang State Key Laboratory of Powder Metallurgy Central South UniversityChangsha410083China AECC Commercial Aircraft Engine Co. Ltd.Shanghai200241China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an710049China

Solid solution strengthening(SSS)is one of the main contributions to the desired tensile properties of nickel-based superalloys for turbine blades and disks.The value of SSS can be calculated by using Fleischer’s and Labusch’s theories,while the model parameters are incorporated without fitting to experimental data of complex alloys.In thiswork,four diffusionmultiples consisting of multicomponent alloys and pure Niare prepared and characterized.The composition and microhardness of singleγphase regions in samples are used to quantify the SSS.Then,Fleischer’s and Labusch’s theories are examined based on high-throughput experiments,respectively.The fitted solid solution coefficients are obtained based on Labusch’s theory and experimental data,indicating higher accuracy.Furthermore,six machine learning algorithms are established,providing a more accurate prediction compared with traditional physical models and fitted physical models.The results show that the coupling of highthroughput experiments and machine learning has great potential in the field of performance prediction and alloy design.

关键词： Multicomponent diffusion multiples solid solution strengthening strengthening models machine learning

Research on the Marketing Mechanism of E-commerce Live Broadcast - Based on The Perspective of Brand Value Co-Creation

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

管理科学与研究（中英文版） 2022年第5期11卷 56-61页

作者： zexin wang Jiachen Gu School of Foreign Languages and Cultures Beijing Wuzi UniversityBeijing101100China

Today,the e-commerce live broadcast industry has formed a huge market,and it has become one of the important ways for most netizens to purchase goods.Live streaming has brought new opportunities for e-commerce and new growth for brand value.The interaction between brands and customers has gradually expanded,in this case,the importance of value co-creation has become more and more prominent.This article will take e-commerce live broadcast marketing as the research object,and the brand value co-creation as the research perspective,then provide a direction based on the value co-creation perspective for the healthy and long-term development of e-commerce live broadcast marketing by studying and analyzing the cases of brand value co-creation.

关键词： E-commerce Live Commerce Brand Value Co-creation Marketing Mechanism

Onboard actuator model-based Incremental Nonlinear Dynamic Inversion for quadrotor attitude control:Method and application

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

Chinese Journal of Aeronautics 2021年第11期34卷 216-227页

作者： zexin wang Jiang ZHAO Zhihao CAI Yingxun wang Ningjun LIU School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China

This paper addresses the robust attitude control problem for quadrotors subject to model mismatch and disturbances.A dynamic inversion based attitude control scheme is proposed,which consists of an outer loop attitude controller and an inner loop angular acceleration controller.The attitude controller is designed based on the Nonlinear Dynamic Inversion(NDI)to precisely linearize the nonlinear dynamics between the angular acceleration and the attitude.An onboard actuator model-based Incremental Nonlinear Dynamic Inversion(INDI)controller is designed in the angular acceleration control loop to improve the robustness against the model mismatch and disturbances.Meanwhile,the onboard actuator model with a modified structure eliminates the oscillation phenomenon when the sampling rate of the controller is higher than that of the actuator.Numerical simulations and flight tests demonstrate the effectiveness and robustness of the proposed controller in comparison with the PID controller.

关键词： Actuator Attitude control INDI NDI Quadrotor

One-year status of hepatic venous pressure gradient measurement from 85 hospitals in China

在线全文

学校读者我要写书评

暂无评论

Portal Hypertension & Cirrhosis 2024年第2期3卷 116-123页

作者： Jitao wang Ting Cui Linpeng Zhang Zhiping Yan Lei Li Jinjun Chen Junhui Sun Hua Xiang He Zhu Hao Wu Jiancuo Gengzang Feng Zhang Wei Wu Guohong Cao Wuhua Guo Haibin Shi Hui Xue Guangjun Huang Qiang Yu Meng Niu Huiling Xiang Derun Kong Wei Gou Xuefeng Luo Fuliang He Min Yuan Wei Liu Yong wang Hongjie Hu Xiaoli Zhu Tao Yu Qinxue Sun Wei Qu Ting Lu Deqiang Ma Li Zhang Jun Ma Jun Yang Ketao Mu Xiaoliang Zhu Kai Xiong Huiguo Ding Shengjuan Yao Mingsheng Huang Fang wang zexin wang Yong Huang Jianan Li Hongfeng Yi Birun Huang Zhongwei Zhao Duiping Feng Yanming Lei Changlong Hou Wenbo Guo Shirong Liu Gaojun Teng Kangshun Zhu Fan Wu Xiaogang Hu Wenfeng Zhang Shaoqi Yang Zhouchao Hu Pengfei Pang Shaowu Zhuang Weidong wang Qingliang Zhu Kunpeng Zhang Chengyu Liu Dongliang Li Chao Ma Hong Jiang Xingong Zhao Weixin Ren Zhiwei wang Lei Yu Fuhuang Lin Chaoguang Yan Feng wang Lei Yu Hui Huan Wenyong Shen Shaofei He Chengda Zhang Jinlun Bao Jiangtao Liu Jun Wu Jianbo Zhao Jian Zhang Xiaolong Qi Hebei Provincial Key Laboratory of Cirrhosis&Portal Hypertension Xingtai People's HospitalXingtaiHebeiChina Center of Portal Hypertension Department of RadiologyZhongda HospitalSchool of MedicineSoutheast UniversityNanjingJiangsuChina Department of Interventional Therapy Beijing Shijitan Hospital Affiliated to Capital Medical UniversityBeijingChina Department of Intervention Taiyuan Third People's HospitalTaiyuanShanxiChina Department of Intervention Zhongshan Hospital Affiliated to Fudan UniversityShanghaiChina Department of Interventional Medicine The First Hospital of Lanzhou UniversityLanzhouGansuChina Department of Infectious Diseases Nanfang Hospital of Southern Medical UniversityGuangzhouGuangdongChina Hepatobiliary and Pancreatic Intervention Center The First Affiliated Hospital of Zhejiang University School of MedicineHangzhouZhejiangChina Interventional Vascular Surgery Hunan Provincial People's HospitalChangshaHunanChina Department of Intervention Sixth People's Hospital of ShenyangShenyangLiaoningChina Department of Gastroenterology West China Hospital of Sichuan UniversityChengduSichuanChina Department of Intervention The Fourth People's Hospital of Qinghai ProvinceXiningQinghaiChina Department of Gastroenterology Nanjing Drum Tower HospitalNanjingJiangsuChina Department of Gastroenterology The First Affiliated Hospital of Wenzhou Medical UniversityWenzhouZhejiangChina Department of Radiology Shulan(Hangzhou)HospitalHangzhouZhejiangChina Department of Intervention Mengchao Hepatobiliary Hospital of Fujian Medical UniversityFuzhouFujianChina Department of Interventional Radiology The First Affiliated Hospital of Nanjing Medical UniversityNanjingJiangsuChina Department of Gastroenterology The First Affiliated Hospital of Xi'an Jiaotong UniversityXi'anShaanxiChina Department of Gastroenterology Shandong Provincial Hospital Affiliated to Shandong First Medical UniversityJinanShandongChina Department of Interventional Radiology Fifth Medical Center

Aims:Surveys and research on the applications of the hepatic venous pressure gradient(HVPG)are important for understanding the current status and future development of this technology in China.This article aimed to investigate the status of hepatic venous pressure gradient measurement in China in 2022.Methods:We investigated the overall status of HVPG technology in China-including hospital distribution,hospital level,annual number of cases,catheters used,average cost,indications,and current challenges by using online questionnaire.By counting the number and percentages of cases of these results,we hope to clarify the current status of HVPG measurements in China.Results:According to the survey,85 hospitals in China used HVPG technology in 2022 distributed across 29 provinces.A total of 4989 HVPG measurements were performed in all of the surveyed hospitals in 2022,of which 2813 cases(56.4%)were measured alone.The average cost of HVPG measurement was 5646.8±2327.9 CNY.Of the clinical teams who performed the measurements(sometimes multiple per hospital),94.3%(82/87)used the balloon method,and the majority of the teams(72.4%,63/87)used embolectomy catheters.Conclusions:This survey clarified the clinical application status of HVPG in China and confirmed that some medical institutions in China have established a foundation for this technology.It is still necessary to continue promoting and popularizing this technology in the future.

关键词： application status hepatic vein pressure gradient questionnaire survey

我国农村生活污水与农田退水面源氮磷污染生态净化技术现状与研究进展

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

农业资源与环境学报 2024年第3期41卷 688-696页

作者：蒋昀耕张静卢少勇刘笑欣王泽欣杨嘉鹏艾亚敬中国环境科学研究院环境基准与风险评估国家重点实验室湖泊污染控制国家环境保护重点实验室湖泊水污染治理与生态修复技术国家工程实验室北京100012 沧州师范学院河北沧州061001

当前,我国农村生活污水与农田退水面源氮磷污染尚未得到有效治理,解决此类污染的代表措施——“生态净化技术”的发展广受关注。本文从技术发展、技术标准、技术体系三个角度切入,对农村生活污水与农田退水氮磷污染生态净化技术进行梳... 详细信息

当前,我国农村生活污水与农田退水面源氮磷污染尚未得到有效治理,解决此类污染的代表措施——“生态净化技术”的发展广受关注。本文从技术发展、技术标准、技术体系三个角度切入,对农村生活污水与农田退水氮磷污染生态净化技术进行梳理分析。技术发展从分析和介绍当前热门生态净化技术的研究进展开始,通过调研整理这些技术在我国的推广和应用,梳理其在我国不同区域的发展特征,归纳出当前生态净化技术应用所面临的困难。当前相关部门对生态净化工程的监管仅关注出水水质的达标率,缺乏有效的后期维护及意见调查反馈。在技术标准方面,本文梳理了关于已发布实施的生态净化工程的的系列标准,认为应引入综合效益评价方法,以完善我国生态净化工程的评价体系。在技术体系方面,以生态净化技术的拦截性和修复性为依据对单一技术进行分类,并分别针对农村生活污水、农田退水提出了对应的技术联用体系。

关键词：面源污染生态净化运维管理人工湿地标准评价方法

维普期刊数据库博看期刊

层状硅酸盐矿物对砂岩型铀矿地浸过程中铀浸出效率的影响

在线全文

学校读者我要写书评

暂无评论

矿物岩石 2024年第1期44卷 143-152页

作者：周靖宋昊范元清王泽鑫黄晓东张成江谭亚辉成都理工大学四川成都610059 地质灾害防治与地质环境保护国家重点实验室四川成都610059 地学核技术四川省重点实验室四川成都610059 核工业北京化工冶金研究院北京101149

砂岩型铀矿是重要的铀矿资源,地浸采铀是开发利用砂岩型铀矿的重要方式。在地浸采铀过程中,矿体中白云母、高岭石等层状硅酸盐矿物会降低铀的浸出效率,为了得到层状硅酸盐矿物降低铀浸出效率的具体机制,本文通过元素地球化学及工艺矿物... 详细信息

砂岩型铀矿是重要的铀矿资源,地浸采铀是开发利用砂岩型铀矿的重要方式。在地浸采铀过程中,矿体中白云母、高岭石等层状硅酸盐矿物会降低铀的浸出效率,为了得到层状硅酸盐矿物降低铀浸出效率的具体机制,本文通过元素地球化学及工艺矿物学的相关分析测试探讨砂岩型铀矿浸出实验前后铀的赋存状态及工艺矿物学参数。可知浸出实验前后SiO_(2)含量均在75%~80%左右,Al_(2)O_(3)含量均在10%左右,这两种主量元素含量最高且浸出前后变化不大,浸出后U元素含量从569×10_(-6)降低至200×10_(-6)~300×10_(-6);浸出后铀矿物的主要连生矿物从黄铁矿变为长石、云母和黏土矿物;浸出后白云母、绿泥石等层状硅酸盐矿物的比表面积略微增加。通过扫描电镜对其进行表征可知,地浸前矿石中铀主要以独立铀矿物、吸附态铀、类质同象铀3种形式存在,地浸过程中浸出液会将部分独立铀矿物及吸附态铀浸出带走,但部分吸附在长石孔隙及层状硅酸盐矿物表面的铀难以被浸出,主要是因为层状硅酸盐的层片状结构阻止了铀矿物与溶浸液接触,且原有的黏土矿物、长石溶解新生成的黏土类层状硅酸盐矿物会吸水膨胀从而堵塞浸出液运移流动的孔隙,降低浸出的效率。

关键词：砂岩型铀矿工艺矿物学层状硅酸盐矿物影响机制

松辽盆地钱家店铀矿床钱Ⅳ块中性地浸工艺矿物学特征

在线全文

学校读者我要写书评

暂无评论

矿物岩石 2024年第1期44卷 40-49页

作者：段美铃宋昊范元清王泽鑫黄晓东周靖张成江谭亚辉成都理工大学四川成都610059 地质灾害防治与地质环境保护国家重点实验室四川成都610059 地学核技术四川省重点实验室四川成都610059 核工业北京化工冶金研究院北京101149

天然铀资源有效利用是保障我国核电与核军工天然铀供给、确保核能可持续发展的重要战略基础。中性(CO_(2)+O_(2))地浸采铀已成为我国铀矿占比最高的浸出开发工艺。为研究松辽盆地钱家店铀矿床钱Ⅳ块CO_(2)+O_(2)地浸工艺矿物学特征,本... 详细信息

天然铀资源有效利用是保障我国核电与核军工天然铀供给、确保核能可持续发展的重要战略基础。中性(CO_(2)+O_(2))地浸采铀已成为我国铀矿占比最高的浸出开发工艺。为研究松辽盆地钱家店铀矿床钱Ⅳ块CO_(2)+O_(2)地浸工艺矿物学特征,本次研究选取姚家组粉砂岩中铀矿石为研究对象,开展CO_(2)+O_(2)浸出实验模拟,采用XRF,ICP-MS,XRD,SEM-EDS和TIMA等测试方法将原样及试验后的样品进行系统的工艺矿物学对比研究以期为生产实践采铀提供理论支撑。结果表明,与原样品相比,浸出实验后的样品稀土元素含量明显减少(ΣREE含量由187.06×10^(-6)减至105.16×10^(-6));铀浸出率达到59.8%(U含量由131.00×10^(-6)减至52.60×10^(-6));铀矿物粒度变小,粒度集中在<100μm之间;而铀矿物解离度全部<10%,说明仍有被紧密包裹的铀矿物未被浸出。研究区铀的赋存状态以分散吸附态为主,独立铀矿物含量较少,在浸出后发现与黄铁矿等连生的细颗粒铀矿物残存较多。因此,钱家店铀矿床钱Ⅳ块CO_(2)+O_(2)地浸生产采铀过程中需考虑对粒度小和被紧密包裹的铀矿物提取,以及在制备溶浸剂时提高对黄铁矿的氧化效率将与其连生的沥青铀矿中的铀释放出来,从而进一步提高铀的浸出率。

关键词： CO_(2)+O_(2)地浸工艺矿物学地浸采铀钱家店铀矿床

伊犁盆地蒙其古尔砂岩型铀矿床中性CO_(2)+O_(2)地浸中铀的赋存状态变化特征及其规律

在线全文

学校读者我要写书评

暂无评论

矿物岩石 2024年第1期44卷 81-90页

作者：于慧杰宋昊王泽鑫范元清李梅杜钱敏张成江谭亚辉成都理工大学四川成都610059 地质灾害防治与地质环境保护国家重点实验室四川成都610059 地学核技术四川省重点实验室四川成都610059 核工业北京化工冶金研究院北京101149

自我国采用CO_(2)+O_(2)中性地浸工艺采铀后,一定程度上解决了高碳酸盐矿床采用酸法和碱法地浸导致的堵塞和浸出率低的问题。新疆蒙其古尔铀矿床是我国采用CO_(2)+O_(2)中性浸出方法的代表性高碳酸盐砂岩型铀矿床之一。本研究以蒙其古... 详细信息

自我国采用CO_(2)+O_(2)中性地浸工艺采铀后,一定程度上解决了高碳酸盐矿床采用酸法和碱法地浸导致的堵塞和浸出率低的问题。新疆蒙其古尔铀矿床是我国采用CO_(2)+O_(2)中性浸出方法的代表性高碳酸盐砂岩型铀矿床之一。本研究以蒙其古尔铀矿床原矿石为研究对象开展室内铀浸出实验,并对浸出前后的样品磨制薄片进行TIMA自动矿物扫面以及扫描电镜分析,以查明矿石浸出前后铀赋存状态以及铀矿物粒度、解离度和连生矿物等工艺参数的变化,为改进采铀工艺提供矿物学参数依据。结果表明蒙其古尔铀矿床原矿石中铀的存在形式主要为独立铀矿物、含铀矿物和吸附态铀。铀矿物主要为铀石,以及少量的沥青铀矿。相比于浸出前,浸出后铀石、沥青铀矿均被大量浸出,大于30μm的铀石被浸出完全,沥青铀矿仅剩少量8~9μm的未被浸出。铀石的解离度在浸出前后最大的变化是小于10%的占比从49.68%变为84.20%。相比于铀石,原矿石中沥青铀矿的解离度更高,在80%~90%解离度范围内的占比达53.06%,浸出后仅有少量60%~70%解离度的沥青铀矿未被浸出。研究表明解离度较大的铀矿物比解离度较小的更易被浸出,沥青铀矿相对于铀石更易被浸出。浸出过程中需要控制好浸出体系的pH,阻止含铀方解石的二次沉淀。本研究查明了浸出前后铀赋存状态以及铀矿物的工艺参数的变化特征,有助于研究影响矿石地浸效率的各种因素,对推动蒙其古尔以及我国类似铀矿床地浸开采技术的完善与创新具有重要的理论和现实意义。

关键词：砂岩型铀矿 CO_(2)+O_(2)中性浸出 TIMA 赋存状态

二连盆地艾勒格庙铀矿区铀矿石工艺矿物学特征及地浸工艺的选择

在线全文

学校读者我要写书评

暂无评论

矿物岩石 2024年第1期44卷 121-131页

作者：于慧杰宋昊王泽鑫乔鹏范元清徐争启李梅杜钱敏张成江谭亚辉成都理工大学四川成都610059 地质灾害防治与地质环境保护国家重点实验室四川成都610059 地学核技术四川省重点实验室四川成都610059 中核内蒙古矿业有限公司内蒙古呼和浩特010020 核工业北京化工冶金研究院北京101149

可地浸砂岩型铀矿床铀赋存状态及铀矿物的工艺矿物学特征会直接影响地浸过程中浸出工艺的选择及铀浸出效率,而地浸工艺的合理选择对铀矿床开采效率和经济效益的提高具有重要意义。本研究采集了二连盆地艾勒格庙铀矿区矿石样品,通过扫描... 详细信息

可地浸砂岩型铀矿床铀赋存状态及铀矿物的工艺矿物学特征会直接影响地浸过程中浸出工艺的选择及铀浸出效率,而地浸工艺的合理选择对铀矿床开采效率和经济效益的提高具有重要意义。本研究采集了二连盆地艾勒格庙铀矿区矿石样品,通过扫描电镜及综合矿物分析仪(TIMA)等方法,分析铀的赋存状态以及铀矿物粒度、解离度、连生矿物等工艺矿物学参数。结果表明:(1)艾勒格庙铀矿区矿石中铀的存在形式主要为铀矿物、含铀矿物和吸附态铀。铀矿物主要为铀石及少量沥青铀矿。(2)铀石粒径最大可达350~400μm,沥青铀矿粒径最大为20~30μm;大多数铀石和全部的沥青铀矿的粒径都小于30μm(分别占总颗粒数量的48.42%和100%)。(3)铀矿物的解离度较低,解离度小于10%的铀石和沥青铀矿的占比分别达到了47.26%和97.08%。与铀矿物连生关系最密切的矿物为黄铁矿、正长石等。铀矿物类型主要为铀石,矿石中碳酸盐矿物含量较低且矿体埋深较浅等特征都表明艾勒格庙铀矿区适宜采用酸法浸出。实际地浸中可通过调控不同溶浸过程溶浸液硫酸浓度,降低非铀矿物对硫酸试剂的消耗。本研究有效查明了艾勒格庙铀矿区铀赋存状态,为制定适合该矿区的地浸工艺方式及正确评价该矿区的地浸开发前景提供了工艺矿物学依据,对推动艾勒格庙铀矿区以及二连盆地其他铀矿床地浸开采技术的发展具有重要的理论意义。

关键词：二连盆地艾勒格庙铀矿区铀赋存状态地浸工艺

鄂尔多斯盆地纳岭沟铀矿床铀赋存状态及铀矿物工艺矿物学研究

在线全文

学校读者我要写书评

暂无评论

矿物岩石 2024年第1期44卷 61-70页

作者：田增辉宋昊范元清王泽鑫乔鹏黄晓东周靖张成江徐争启谭亚辉成都理工大学四川成都610059 地学核技术四川省重点实验室四川成都610059 中核内蒙古矿业有限公司内蒙古呼和浩特010020 核工业北京化工冶金研究院北京101149

铀的赋存状态直接影响在地浸过程中铀的浸出率,通过铀矿物的工艺矿物学特征能反映铀矿物与浸矿剂的接触情况,因此研究矿床中铀赋存状态及铀矿物工艺矿物学特征对地浸开采具有重要意义。本研究运用扫描电镜(SEM)以及综合矿物分析仪(TIMA... 详细信息

铀的赋存状态直接影响在地浸过程中铀的浸出率,通过铀矿物的工艺矿物学特征能反映铀矿物与浸矿剂的接触情况,因此研究矿床中铀赋存状态及铀矿物工艺矿物学特征对地浸开采具有重要意义。本研究运用扫描电镜(SEM)以及综合矿物分析仪(TIMA)等方法对纳岭沟铀矿床铀的赋存状态及铀矿物的工艺矿物学特征(包括铀矿物粒度、解离度、连生矿物占比)进行研究。结果表明:(1)纳岭沟铀矿床铀存在形式以独立铀矿物(主要为铀石)为主,还包括少量含铀矿物(锆石,独居石等)以及吸附态铀。(2)铀矿物粒度基本都处于0~160μm范围内,占比90.07%,其中大部分铀矿物粒度小于50μm(60.92%),少量(9.93%)的铀矿物粒度大于200μm。(3)铀矿物与有机质、绿泥石、石英、黑云母、正长石等矿物连生关系密切,其占比分别为21.46%、16.48%、13.76%、11.56%、10.45%,指示铀矿物大部分与矿物连生。本研究有效查明了纳岭沟铀矿床铀矿物的空间嵌布关系,其主要赋存在有机质内部及其表面,除此之外也分布在绿泥石与黑云母的层间裂隙中。因有机质的疏水性以及绿泥石与黑云母的层状结构难以破坏,最终会导致铀的浸出率降低。纳岭沟铀矿床铀赋存状态表明,大部分铀矿物能被浸出,但在实际地浸过程中,部分铀矿物会因难以与溶浸液接触导致铀的浸出率下降。

关键词： TIMA 工艺矿物学 CO_(2)+O_(2)地浸纳岭沟铀矿床