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Performance of water-coupled charge blasting under different in-situ stresses

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Journal of Central South University 2024年第7期31卷 2300-2320页

作者： ZHOU Zi-long WANG Zhen CHENG rui-shan CAI Xin LAN Ri-yan School of Resources and Safety Engineering Central South UniversityChangsha 410083China Center for Infrastructural Monitoring and Protection School of Civil and Mechanical EngineeringCurtin UniversityBentleyAustralia Guangxi Xinfazhan Communication Group Co. Ltd.Nanning 530000China

Water-coupled charge blasting is a promising technique to efficiently break rock *** this study,numerical models of double boreholes with water-coupled charge are established using LS-DYNA and are calibrated by the tests of rock masses subjected to explosion loads to examine its *** crack levels of rock mass induced by water-coupled charge blasting and air-coupled charge blasting are first *** is found that water-coupled charge blasting is more appropriate to fracture deep rock mass than air-coupled charge *** addition,the effects of rock properties,water-coupled charge coefficients,and borehole connection angles on the performance of water-coupled charge blasting are *** results show that rock properties and water-coupled charge coefficients can greatly influence the crack and fragmentation levels of rock mass induced by water-coupled charge blasting under uniform and non-uniform in-situ ***,changing borehole-connection angles can only affect crack and fragmentation levels of rock mass under non-uniform in-situ stresses but barely affect those under uniform in-situ stresses.A formula is finally proposed by considering the above-mentioned factors to provide the design suggestion of water-coupled charge blasting to fracture rock mass with different in-situ stresses.

关键词： water-coupled blasting in-situ stress water-coupled charge coefficient rock type borehole-connection angle

Design and implementation of dual-mode configurable memory architecture for CNN accelerator

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High Technology Letters 2024年第2期30卷 211-220页

作者：山蕊 LI Xiaoshuo GAO Xu HUO Ziqing School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi’an 710121P.R.China

With the rapid development of deep learning algorithms,the computational complexity and functional diversity are increasing ***,the gap between high computational density and insufficient memory bandwidth under the traditional von Neumann architecture is getting *** the algorithmic characteristics of convolutional neural network(CNN),it is found that the access characteristics of convolution(CONV)and fully connected(FC)operations are very *** on this feature,a dual-mode reronfigurable distributed memory architecture for CNN accelerator is *** can be configured in Bank mode or first input first output(FIFO)mode to accommodate the access needs of different *** the same time,a programmable memory control unit is designed,which can effectively control the dual-mode configurable distributed memory architecture by using customized special accessing instructions and reduce the data accessing *** proposed architecture is verified and tested by parallel implementation of some CNN *** experimental results show that the peak bandwidth can reach 13.44 GB·s^(-1)at an operating frequency of 120 *** work can achieve 1.40,1.12,2.80 and 4.70 times the peak bandwidth compared with the existing work.

关键词： distributed memory structure neural network accelerator reconfigurable arrayprocessor configurable memory structure

以饲料行业助推三产融合,加速农业农村经济发展

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中国饲料 2024年第8期 137-140页

作者：单雪单锐郑州升达经贸管理学院河南郑州450000

三产融合强调农业产业中资本、技术和资源要素的优化配置,以产业联动、产业链延伸、产业集聚等方式加速农业农村经济发展,增加农民经济收入。而饲料行业是联系种植业和养殖业的桥梁纽带,在以农业为基本依托的三产融合背景下,饲料行业能... 详细信息

三产融合强调农业产业中资本、技术和资源要素的优化配置,以产业联动、产业链延伸、产业集聚等方式加速农业农村经济发展,增加农民经济收入。而饲料行业是联系种植业和养殖业的桥梁纽带,在以农业为基本依托的三产融合背景下,饲料行业能激活农业生产要素,加快农村基础设施建设,有效解决农村就业问题,带动农业产业化发展。因此,三产融合要以饲料行业为载体,积极推动农业农村经济发展。

关键词：饲料行业三产融合农业产业农业农村经济

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基于循环经济的绿色饲料产业高质量发展路径

中国饲料 2024年第8期 157-160页

作者：单锐单雪郑州升达经贸管理学院河南郑州450000

在饲料产业发展过程中,循环经济能满足清洁、高效、可持续的要求,在给饲料产业带来可观经济效益的同时,有助于饲料产业的高质量发展。因此,要正视循环经济的作用和价值,深入了解循环经济与饲料产业的关系,通过增强环保意识、优化技术条... 详细信息

在饲料产业发展过程中,循环经济能满足清洁、高效、可持续的要求,在给饲料产业带来可观经济效益的同时,有助于饲料产业的高质量发展。因此,要正视循环经济的作用和价值,深入了解循环经济与饲料产业的关系,通过增强环保意识、优化技术条件、加大资金投入、发挥人才优势、构建监督机制等方式转变饲料产业的传统生产结构,促进饲料产业的绿色转型升级。

关键词：循环经济绿色饲料产业高质量发展

康复机器人具有速度决策的每步限时学习控制方法

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控制与决策 2024年第8期39卷 2679-2684页

作者：单芮孙平王硕玉沈阳工业大学人工智能学院沈阳110870 高知工科大学智能机械系统工程学院日本高知7828502

为了提高康复步行训练器人的智能性和安全性,提出一种运动速度决策的康复训练机器人限时学习迭代控制方法,目的是抑制训练者位姿不确定性和人机速度不协调对系统安全性能的影响.建立具有系统不确定偏移量的康复步行训练机器人动力学模型... 详细信息

为了提高康复步行训练器人的智能性和安全性,提出一种运动速度决策的康复训练机器人限时学习迭代控制方法,目的是抑制训练者位姿不确定性和人机速度不协调对系统安全性能的影响.建立具有系统不确定偏移量的康复步行训练机器人动力学模型,通过比较康复训练机器人当前的运动速度和训练者的实际步行速度,提出机器人运动速度的决策方法,从而使康复者在主动训练模式下实现人机速度协调运动;进一步,利用机器人决策的运动速度和动力学模型建立跟踪误差系统,提出有限学习时间的迭代控制方法,并基于Lyapunov理论验证跟踪误差系统的有限时间稳定性.仿真对比分析和实验结果表明,所提出的速度决策方法和跟踪控制方法能使人机系统协调地进行主动模式的康复训练.

关键词：康复步行训练机器人每步限时学习运动速度决策迭代学习控制人机速度协调主动康复训练

Pregnancy and the disease recurrence of patients previously treated for differentiated thyroid cancer:A systematic review and meta analysis

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Chinese Medical Journal 2024年第5期137卷 547-555页

作者： rui shan Xin Li Ming Tao Wucai Xiao Jing Chen Fang Mei Shibing Song Bangkai Sun Chunhui Yuan Zheng Liu Department of Maternal and Child Health School of Public HealthPeking UniversityBeijing 100191China Department of General Surgery Peking University Third HospitalBeijing 100191China Department of Pathology Peking University Third HospitalSchool of Basic Medical SciencesPeking University Health Science CenterBeijing 100191China Information Management and Big Data Center Peking University Third HospitalBeijing 100191China

Background:Differentiated thyroid cancer(DTC)is commonly diagnosed in women of child-bearing age,but whether pregnancy influences the prognosis of DTC remains *** study aimed to summarize existing evidence regarding the association of pregnancy with recurrence risk in patients previously treated for ***:We searched PubMed,Embase,Web of Science,Cochrane,and Scopus based on the prespecified protocol registered at PROSPERO(CRD42022367896).After study selection,two researchers independently extracted data from the included *** quantitative data synthesis,we used random-effects meta-analysis models to pool the proportion of recurrence(for pregnant women only)and odds ratio(OR;comparing the risk of recurrence between the pregnancy group and the nonpregnancy group),*** we conducted subgroup analyses to explore whether risk of recurrence differed by response to therapy status or duration of follow-up *** also assessed quality of the included ***:A total of ten studies were *** sample size ranged from 8 to 235,with participants’age at pregnancy or delivery ranging from 28 to 35 *** follow-up time varied from 0.1 to 36.0 *** pooled proportion of recurrence in all pregnant patients was 0.13(95%confidence intervals[CI]:0.06-0.25;I^(2):0.58).Among six included studies reporting response to therapy status before pregnancy,we observed a trend for increasingly higher risk of recurrence from excellent,indeterminate,and biochemically incomplete to structurally incomplete response to therapy(P trend0.05)or the OR of recurrence in studies with a comparison group(P>0.05).Two included studies t

关键词： Thyroid cancer Pregnancy Recurrence Women Systematic review Meta-analysis

Dysbiosis promotes recurrence of adenomatous polyps in the distal colorectum

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World Journal of Gastrointestinal Oncology 2024年第8期16卷 3600-3623页

作者： Li-Li Yin Ping-Qian Qi Yun-Fei Hu Xiao-Jun Fu rui-shan He Meng-Meng Wang Yan-Juan Deng Su-Yi Xiong Qi-Wen Yu Jin-Ping Hu Lv Zhou Zhi-Bin Zhou Ying Xiong Huan Deng The Affiliated Rehabilitation Hospital Jiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina The Fourth Affiliated Hospital Jiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina The Second College of Clinical Medicine Jiangxi Medical CollegeNanchang UniversityNanchang 330006Jiangxi ProvinceChina Tumor Immunology Institute Nanchang UniversityNanchang 330006Jiangxi ProvinceChina Department of General Medicine The Second College of Clinical MedicineJiangxi Medical CollegeNanchang UniversityNanchang 330031Jiangxi ProvinceChina The Ministry of Education Basic Research and Innovation Center for the Targeted Therapeutics of Solid Tumors Jiangxi Medical CollegeNanchang UniversityNanchang 330031Jiangxi ProvinceChina

BACKGROUND Colorectal polyps,which are characterized by a high recurrence rate,represent preneoplastic conditions of the *** to unclear mechanisms of pathogenesis,first-line therapies for non-hereditary recurrent colorectal polyps are limited to endoscopic *** recent studies suggest a mechanistic link between intestinal dysbiosis and polyps,the exact compositions and roles of bacteria in the mucosa around the lesions,rather than feces,remain *** To clarify the composition and diversity of bacteria in the mucosa surrounding or 10 cm distal to recurrent intestinal *** Mucosal samples were collected from four patients consistently with adenomatous polyps(Ade),seven consistently with non-Ade(Pol),ten with current Pol but previous Ade,and six healthy individuals,and bacterial patterns were evaluated by 16S rDNA *** discriminant analysis and Student’s t-tests were used to identify the genus-level bacteria differences between groups with different colorectal polyp ***’s correlation coefficients were used to evaluate the correlation between intestinal bacteria at the genus level and clinical *** The results confirmed a decreased level of probiotics and an enrichment of pathogenic bacteria in patients with all types of polyps compared to healthy *** changes were not restricted to the mucosa within 0.5 cm adjacent to the polyps,but also existed in histologically normal tissue 10 cm distal from the *** differences in bacterial diversity were observed in the mucosa from individuals with normal conditions,Pol,and *** abundance of Gram-negative bacteria,including Klebsiella,Plesiomonas,and Cronobacter,was observed in Pol group and Ade group,suggesting that resistance to antibiotics may be one risk factor for bacterium-related harmful ***,age and gender were linked to bacteria changes,indicating the potential involvement of sex hormone

关键词： Dysbiosis Biopsy Polyp Bacteria Colorectum

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Pt/CaO材料催化糠醇加氢制备戊二醇

化工进展 2024年第3期43卷 1318-1327页

作者：萧垚鑫张军单锐袁浩然陈勇华南农业大学生物质工程研究院广东广州510642 中国科学院广州能源研究所广东广州510640 中国科学院可再生能源重点实验室广东广州510640 广东省新能源和可再生能源研究开发与应用重点实验室广东广州510640

通过浸渍法制备出一系列氧化钙负载铂金属催化材料,用于生物质基糠醇选择性加氢制备戊二醇研究。研究采用X射线衍射仪、扫描电子显微镜、CO_(2)-程序升温脱附、N2等温吸附-脱附、X射线光电子能谱、热重-差热分析法等一系列表征手段,对... 详细信息

通过浸渍法制备出一系列氧化钙负载铂金属催化材料,用于生物质基糠醇选择性加氢制备戊二醇研究。研究采用X射线衍射仪、扫描电子显微镜、CO_(2)-程序升温脱附、N2等温吸附-脱附、X射线光电子能谱、热重-差热分析法等一系列表征手段,对合成的催化剂样品物理化学性质进行了系统表征。实验结果表明,Pt/CaO-600催化剂表现出优异的催化活性,在4MPa氢压、210℃反应温度条件下,糠醇转化率为99.8%,1,2-戊二醇和1,5-戊二醇收率分别可达48.6%和21.5%。催化剂的优异性能可归因于作为载体的CaO提供了适宜的碱性位点,有利于糠醇开环反应的发生,进而提高了糠醇转化率与戊二醇选择性。同时,催化剂还表现出了优异的循环使用性能,经重复使用4次后,其催化糠醇转化率可达96.5%,1,2-戊二醇和1,5-戊二醇的收率分别为40.3%和17.0%。

关键词：糠醇催化加氢戊二醇

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上海市建设用地与人口变化的关联特征及展望

自然资源学报 2024年第5期39卷 1160-1173页

作者：游猎刘晓琴陈睿山上海交通大学设计学院上海200240

系统研究建设用地与人口的时空耦合关系,是优化调整建设用地与人口政策,提高土地资源利用效率的理论基础。利用1990年以来四次人口普查数据与多时期土地利用遥感监测数据,基于人口—建设用地变化率模型分析1990—2020年间上海市域及16... 详细信息

系统研究建设用地与人口的时空耦合关系,是优化调整建设用地与人口政策,提高土地资源利用效率的理论基础。利用1990年以来四次人口普查数据与多时期土地利用遥感监测数据,基于人口—建设用地变化率模型分析1990—2020年间上海市域及16个行政区建设用地面积与人口数量的时空变化特征和耦合关系。研究发现:(1)30年间上海市建设用地和人口均大幅扩张,强度剧烈,呈典型的蔓延特征。(2)全市16个区人口用地变迁同时呈现空间分异和地理邻近特征。(3)在近郊区和远郊区变迁强度先增后减的同时,部分中心城区出现人口用地的减少。研究结果反映出30年来上海市人口用地变化与城市发展呈现出一种“补偿式启动、扩张式发展、收缩式平衡”的阶段性特征。首次提出了变迁强度、弹性等概念和计算方法,并加入地理信息增强结果可视化,为超大城市人地关系提供了评价方法和价值导向,可为相关政策制定和规划编制提供参考。

关键词：人地关系人口—建设用地变化率模型人居空间变迁模型关联特征上海