检索结果-南通市图书馆

Research and test of the measurement sensing device for the downforce of no-till planter row unit gauge wheels

International Journal of Agricultural and Biological Engineering 2024年第2期17卷 250-259页

作者： jiajie shang Liyi Liu Ruifeng Zhang Hongcheng Li Shouyin Hou Hongxin Liu Haitao Chen College of Engineering Northeast Agricultural UniversityHarbin 150036China College of Mechanical and Electrical Engineering Suqian UniversitySuqian 223800JiangsuChina

To effectively obtain the downforce of the gauge wheels in real time,mechanical models of the interaction among the ground,gauge wheels,gauge wheel arms,and depth adjustment lever were constructed.A measuring method was proposed for monitoring the downforce through a two-dimensional radial sensing device,and a corresponding prototype was *** simulation analysis of the sensing device with ANSYS,a 45°angle was determined to exist between the strain gauge axis and the sensing device axis,and the Wheatstone bridging circuit of R1+R3−R5−R7(R stands for resistance strain gauge,different figures represent the strain gauge number)and R2+R4−R6−R8 was *** to performance and calibration tests for the sensing device,the maximum interaction effect between the X and Y axes was 2.52%,and the output signal was stable and *** standard error of the slope of the fitting equation of the downforce calculation model is *** to the field test,the average downforce of the gauge wheels was 1148,1017,843,and 713 N,at different sowing speeds of 6,8,10,and 12 km/h,*** coefficients of variation were 0.40,0.41,0.62,and 0.71,*** results indicate that the downforce fluctuation of the gauge wheels became more severe with increasing planting *** the strain simulation analysis and field test verified that the measurement method is accurate and reliable,the performance of the sensing device is stable,the measurement method and sensing device meet the application requirements and lay a foundation for the research of accurate and stable control of downforce of no-till planter.

关键词： no-till planter gauge wheel downforce two-dimensional radial force sensing device strain analysis measurement mode and method

来源：

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

Evaluation of the nonmarket value of livestock and poultry feces returning to farmland utilization using CVM in Heilongjiang,China

引用

International Journal of Agricultural and Biological Engineering 2023年第2期16卷 48-56页

作者： jiajie shang Yongtao Xie Lifeng Guo Jinxia Fan Hongxin Liu College of Engineering Northeast Agricultural UniversityHarbin 150036China Key Laboratory of Swine Facilities Engineering Ministry of Agriculture and Rural AffairsHarbin 150036China College of Mechanical and Electrical Engineering Suqian UniversitySuqian 223800JiangsuChina

Aiming at a series of hot issues and topics,such as resource waste,environmental pollution,and Mollisol protection,related to the arbitrary discharge of livestock and poultry feces,livestock and poultry feces are taken as the research object,a questionnaire survey was conducted to investigate residents’cognition and willingness to pay(WTP)for the nonmarket value of livestock and poultry feces returning to farmland in Heilongjiang Province,*** contingent valuation method(CVM)was used for the correlation analysis of WTP and socioeconomic characteristics,and correlation analysis of payment mode and socioeconomic ***,the factors influencing WTP and payment mode were *** results show that the majority of the respondents are aware of the harmfulness of the arbitrary discharge of livestock and poultry feces and the importance of its nonmarket regeneration *** 90.09% of respondents were willing to pay for the return of livestock and poultry feces to *** 2020,the total value of WTP of livestock and poultry feces returning to farmland in Heilongjiang Province was 4.65 billion CNY,equivalent to 1.32% of the total agricultural production of Heilongjiang Province in the same *** the nonmarket value of livestock and poultry feces is estimated to be 1456.69 CNY/*** annual average WTP of rural and urban households is 286.42 CNY and 422.90 CNY per household,accounting for 0.46% and 0.52% of the average annual income of households,***,the return of livestock and poultry feces to farmland utilization has a high nonmarket *** analysis shows that the average annual household income is a significant factor in WTP,and the registered permanent residence type and the average annual household income are significant factors in payment *** research results should provide a scientific and theoretical basis for the government’s policy and decision-making on the return of livestock and poultry feces to

关键词： nonmarket value livestock and poultry feces farmland utilization CVM WTP

来源：

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

DeepRisk:A deep learning approach for genome-wide assessment of common disease risk

引用

Fundamental Research 2024年第4期4卷 752-760页

作者： jiajie Peng Zhijie Bao Jingyi Lia Ruijiang Han Yuxian Wang Lu Han Jinghao Peng Tao Wang Jianye Hao Zhongyu Wei Xuequn shang AI for Science Interdisciplinary Research Center Schoolof Computer ScienceNorthwestern Polyechnical UniversityXi'an 129China Key Laboratoryof Bg Data Sorage and Management Northwestern Polytechnical UniversityMinisty of Industy and Information TechnologyX'an 129Chin College of Intelligence and Computing Tianjin UniversityTianjin 300072China School of Data Science Fudan UniversityShanghai 200433China Research and Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518000China

The potential for being able to identify individuals at high disease risk solely based on genotype data has garnered significant *** widely applied,traditional polygenic risk scoring methods fall short,as they are built on additive models that fail to capture the intricate associations among single nucleotide polymorphisms(SNPs).This presents a limitation,as genetic diseases often arise from complex interactions between multiple *** address this challenge,we developed DeepRisk,a biological knowledge-driven deep learning method for modeling these complex,nonlinear associations among SNPs,to provide a more effective method for scoring the risk of common diseases with genome-wide genotype *** demonstrated that DeepRisk outperforms existing PRs-based methods in identifying individuals at high risk for four common diseases:Alzheimer's disease,inflammatory bowel disease,type 2diabetes,and breast cancer.

关键词： Disease risk prediction Deep learning Polygenic risk score Common disease risk Disease prevention

来源：

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

有机肥侧抛装置螺旋叶片辅助辊轮设计与试验

引用

农业机械学报 2023年第4期54卷 107-119页

作者：刘宏新赵一健解勇涛张一鸣尚家杰东北农业大学工程学院哈尔滨150030 宿迁学院机电工程学院宿迁223800

为解决现有对置斜盘有机肥侧抛装置在抛撒时存在的近处肥料堆积与局部起垄问题,结合侧抛装置各部件作用及工作原理,在理论分析的基础上设计一种对称螺旋叶片辅助辊轮,并优化其关键结构参数和作业参数,明确了其与主抛撒部件圆盘的空间位... 详细信息

为解决现有对置斜盘有机肥侧抛装置在抛撒时存在的近处肥料堆积与局部起垄问题,结合侧抛装置各部件作用及工作原理,在理论分析的基础上设计一种对称螺旋叶片辅助辊轮,并优化其关键结构参数和作业参数,明确了其与主抛撒部件圆盘的空间位置关系。利用EDEM软件先后开展了单因素与响应面仿真试验,研究了辊轮转速、螺旋角和叶片数对均匀度变异系数和1 m内肥料占比的影响,优化后得到了最优参数组合。仿真结果表明,辅助辊轮工作时的最优参数组合为辊轮转速2238 r/min、螺旋角42.70°、叶片数4,均匀度变异系数24.45%、1 m内肥料占比24.96%,且以该参数组合进行仿真的结果优于原辊轮最优参数仿真结果;设计的辅助辊轮样机试验结果为均匀度变异系数25.46%、1 m内肥料占比25.65%,相较于原辅助辊轮的46.77%与65.94%有了很大改善,配合主盘共同作用时抛撒均匀性好,无堆积和起垄现象。研究表明:对称螺旋叶片可有效修正肥料颗粒运动方向,使主盘集中的非受控肥料向两侧分散,与主盘及其他辅助部件联合作用下大幅提高了抛撒性能。

关键词：有机肥侧抛辅助辊轮对称螺旋叶片

来源：

维普期刊数据库博看期刊

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

具有复合充填力的立式浅盆型排种器充种机理

引用

农业工程学报 2014年第21期30卷 9-16页

作者：刘宏新徐晓萌郭丽峰尚家杰东北农业大学工程学院哈尔滨150030

为了从力学角度研究提高机械式精密排种器的充种能力以适应高速作业需要,分析了排种器种腔内种子各方向力学特征及规律,建立型孔充填力模型,找出提高充填能力的有效途径,并以增加充填力种类为目标创新设计一种立式浅盆型排种器。其排种... 详细信息

为了从力学角度研究提高机械式精密排种器的充种能力以适应高速作业需要,分析了排种器种腔内种子各方向力学特征及规律,建立型孔充填力模型,找出提高充填能力的有效途径,并以增加充填力种类为目标创新设计一种立式浅盆型排种器。其排种盘结构既能保留传统立式种盘的优点,又避免了离心力对清种产生的负面影响。运用离散元仿真分析软件EDEM(engineering discrete element method)进行仿真并用物理样机试验进一步证实了种盘转速提高时,作为复合力引入的重力与离心力的分力能明显起到保证种子完成向型孔内进入过程的作用,在高速区段平均充填率提高2.33%。该研究为机械式精密排种器的研究提供了借鉴与参考。

关键词：农业机械种子模型机械式排种器浅盆型复合充填力仿真

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

3D multiphysic simulations of energy field and material process in radial ultrasonic rolling electrochemical micromachining

引用

Chinese Journal of Aeronautics 2022年第3期35卷 494-508页

作者： Minghuan WANG Yongchao shang Changshun LIU jiajie WANG Jinsong ZHENG Xufeng XU College of Mechanical Engineering Zhejiang University of TechnologyHangzhou 310023ZhejiangChina Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry of Education Zhejiang University of TechnologyHangzhou 310023ZhejiangChina

The radial ultrasonic rolling electrochemical micromachining(RUR-EMM)combined rolling electrochemical micromachining(R-EMM)and ultrasonic vibration was studied in this *** fundamental understanding of the machining process especially the interaction between multiphysics in the interelectrode gap(IEG)was investigated and discussed by the finite element *** multiphysics coupling model including flow field model,Joule heating model,material dissolution model and vibration model was built.3D multiphysics simulation based on micro dimples process in RUR-EMM and R-EMM was *** results showed that the electrolyte flowed into and out IEG periodically,gas bubbles were easy to squeeze out and the gas void fraction deceased about 16%to 54%,the maximum current density increased by 1.36 times in RUR-EMM than in R-EMM in one vibration period of *** application of the ultrasonic vibration increased the electrolyte temperature about 1.3–4.4%in *** experiments of the micro dimple process denoted better corrosion consistency of array dimples in RUR-EMM,there was no island at the micro dimple bottom which always formed in R-EMM,and an aggregated deviation of less than 8.7%for the micro dimple depth and 4%for the material removal amount between theory and experiment was obtained.

关键词： 3D Multiphysics simulation Electrochemical micromachining Energy field Material process Micro dimple Ultrasonic vibration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

“双一流”建设背景下地方高等农业院校农机专业人才培养模式设计

引用

农机使用与维修 2022年第10期 144-147页

作者：付晓明尚家杰马永财王汉羊黑龙江八一农垦大学工程学院黑龙江大庆163319 东北农业大学工程学院哈尔滨160030

通过对国内外农业工程学科与农机专业发展及趋势进行分析的基础上,探讨了我国“双一流”建设背景下地方高等农业院校农机专业人才培养所面临的机遇与挑战,提出了以地方特色农业产业发展的人才需求为引领,强调与相关基础学科的交叉与融合... 详细信息

通过对国内外农业工程学科与农机专业发展及趋势进行分析的基础上,探讨了我国“双一流”建设背景下地方高等农业院校农机专业人才培养所面临的机遇与挑战,提出了以地方特色农业产业发展的人才需求为引领,强调与相关基础学科的交叉与融合,优化地方高校农机专业人才培养方案,建立多元化、多层次、多类型适应我国区域特色发展的农机人才培养模式。

关键词： “双一流”建设地方高等农业院校农机专业人才培养

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Flexibility and rigidity index for chromosome packing,flexibility and dynamics analysis

引用

Frontiers of Computer Science 2022年第4期16卷 203-213页

作者： jiajie Peng Jinjin Yang D Vijay Anand Xuequn shang Kelin Xia School of Computer Science Northwestern Polytechnical UniversityXi’an710129China Key Laboratory of Big Data Storage and Management Northwestern Polytechnical UniversityMinistry of Industry and Information TechnologyXi’an710129China Division of Mathematical Sciences School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore637371Singapore School of Biological Sciences Nanyang Technological UniversitySingapore637371Singapore

The packing of genomic DNA from double helix into highly-order hierarchical assemblies has a great impact on chromosome flexibility,dynamics and *** open and accessible regions of chromosomes are primary binding positions for regulatory elements and are crucial to nuclear processes and biological *** by the success of flexibility-rigidity index(FRI)in biomolecular flexibility analysis and drug design,we propose an FRI-based model for quantitatively characterizing chromosome *** on Hi-C data,a flexibility index for each locus can be ***,flexibility is tightly related to packing *** compacted regions are usually more rigid,while loosely packed regions are more ***,a strong correlation is found between our flexibility index and DNase and ATAC values,which are measurements for chromosome *** addition,the genome regions with higher chromosome flexibility have a higher chance to be bound by transcription ***,the Gaussian network model(GNM)is applied to analyze the chromosome accessibility and a mobility profile has been proposed to characterize chromosome *** with GNM,our FRI is slightly more accurate(1%to 2%increase)and significantly more efficient in both computational time and *** a 5Kb resolution Hi-C data,the flexibility evaluation process only takes FRI a few minutes on a single-core *** contrast,GNM requires 1.5 hours on 10 ***,interchromosome interactions can be easily combined into the flexibility evaluation,thus further enhancing the accuracy of our *** contrast,the consideration of interchromosome information into GNM will significantly increase the size of its Laplacian(or Kirchhoff)matrix,thus becoming computationally extremely challenging for the current *** software and supplementary document are available at https://***/jiajiepeng/FRI_chrFle.

关键词： flexibility-rigidity index 3D genome chromosome flexibility

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

中医药多元证据整合方法学MERGE框架

引用

协和医学杂志 2024年第1期15卷 172-182页

作者：赖鸿皓王浙李滢唐文静王蓓蓓孙培栋孙铭谣黄嘉杰肖志攀李颖赵晨商洪才杨克虎刘杰葛龙兰州大学公共卫生学院循证社会科学研究中心兰州730000 兰州大学公共卫生学院社会医学与卫生事业管理研究所兰州730000 兰州大学护理学院循证护理研究中心兰州730000 甘肃中医药大学护理学院兰州730030 甘肃中医药大学中西医结合学院兰州730030 中国中医科学院中医临床基础医学研究所北京100700 北京中医药大学东直门医院中医内科学教育部和北京市重点实验室北京100700 兰州大学基础医学院循证医学中心兰州730000 甘肃省循证中医药协同创新基地兰州730000 甘肃省循证医学与临床转化重点实验室兰州730000 中国中医科学院广安门医院肿瘤科北京100053 中国中医药循证医学中心北京100700

在循证医学时代下,依托规范的技术方法和标准化的操作规程发掘中医药独特优势,是实现中医药现代化、国际化发展并惠泽人类的必由之路。中医理论、人用经验和研究证据三结合证据体系的提出标志着中医药特色评价体系思维方法取得了重要进... 详细信息

在循证医学时代下,依托规范的技术方法和标准化的操作规程发掘中医药独特优势,是实现中医药现代化、国际化发展并惠泽人类的必由之路。中医理论、人用经验和研究证据三结合证据体系的提出标志着中医药特色评价体系思维方法取得了重要进步,经过恰当方法整合后的多元证据体是中医药临床指南推荐意见和循证卫生决策的有力支撑。本文基于当前国际证据合成与分级方法学前沿进展,初步提出中医药多元证据整合的方法学框架——MERGE(Merge Evidence-based Research and artificial intelliGence to support smart dEcision)框架,以期为中医药循证医学方法学体系的完善和发展提供借鉴和参考。

关键词：循证医学中医药多元证据证据整合 MERGE框架

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

专业认证背景下农业工程国家级实验教学示范中心建设与实践研究

引用

高等农业教育 2021年第6期 47-51页

作者：尚家杰刘宏新纪文义王奕娇周跃佳东北农业大学农业工程国家级实验教学示范中心黑龙江哈尔滨150030 东北农业大学黑龙江哈尔滨150030

为加快实施国家创新驱动发展战略,构建科学、高效的实践能力训练体系及教学模式,提升创新人才培养能力,对标工程教育认证目标,以农业工程实验教学示范中心为研究对象进行建设和实践研究。通过合理建设规划、统一领导、分级管理机制、构... 详细信息

为加快实施国家创新驱动发展战略,构建科学、高效的实践能力训练体系及教学模式,提升创新人才培养能力,对标工程教育认证目标,以农业工程实验教学示范中心为研究对象进行建设和实践研究。通过合理建设规划、统一领导、分级管理机制、构建多层次教学体系结构、强化中心队伍培训制度、规范中心教学质量保障制度等措施,规范和加强国家级实验教学示范中心的建设与运行。目前,农业工程实验教学示范中心已成为一个门类齐全、设施先进、运行高效、资源共享、开放服务、特色鲜明的示范中心,同时起到了示范和辐射作用的现代化实验中心。

关键词：农业工程实验教学示范中心专业认证实验教学体系实验教学队伍管理机制

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：