检索结果-南通市图书馆

In-situ Horizontal Extrusion Test of Herbaceous Root-Soil with Different Root Types

Journal of Earth Science 2024年第3期35卷 918-928页

作者： Fangcui Liu Shengwen Qi Shenglin Qi Xiaokun Hou Yanrong Li guangming Luo Lei xue xueliang Wang Juanjuan Sun Songfeng Guo Bowen Zheng Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Earth Sciences Chinese Academy of SciencesBeijing 100029China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan Government Affairs Service Center of Beijing Municipal Water Affairs Bureau Beijing 100073China Department of Earth Sciences and Engineering Taiyuan University of TechnologyTaiyuan 030024China

The influence of different types of roots on the soil is complex and still remains unclear.Four in-situ extrusion tests were conducted on two types of root systems,namely fibrous and tap root system,for three plants,Eleusine indica,Potentilla anserine,and Artemisia argyi,according to the classification in Botany,and the thrust-displacement curves and failure patterns of different samples were analysed by comparison to fill the aforementioned gap.Results reveal that the roots can reduce the characteristics of soil brittleness and enhance its capability to resist large deformation,and different root types contribute different effects to the strain-hardening behavior of the root-soil mass.The contribution of the fibrous root system to strength is limited,whilst the tap root system substantially enhances strength and stiffness.Results of failure patterns show that fibrous and tap root systems affect soil solidification and surface cracking reduction.However,the effect of the tap root system depends on the composition of lateral and tap roots:long and rich lateral roots are effective for resisting the creation of cracks,but thick tap roots with few and thin lateral roots may lead to several surface cracks.

关键词： root types fibrous root tap root in-situ horizontal extrusion test root-soil cracks slope protection.

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

Traveling-wave parametric amplifiere-induced qubit dephasing:analysis and mitigation

引用

Chip 2023年第4期2卷 97-104页

作者： Yingshan Zhang Huikai Xu Yu Song Yuqun Xu Shuang Yang Ziyue Hua Shoukuan Zhao Weiyang Liu guangming xue Yirong Jin Haifeng Yu Beijing Academy of Quantum Information Sciences Beijing 100193China Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua UniversityBeijing 100084China Hefei National Laboratory Hefei 230088China

The mitigation of dephasing poses a significant challenge toimproving the performance of error-prone superconducting quantum computing systems.Here,the dephasing of a transmon qubit ina dispersive readout regime was investigated by adopting aJosephson traveling-wave parametric amplifier as the preamplifier.Our findings reveal that the potent pump leakage from the preamplifier may lead to severe dephasing.This could be attributed to amixture of measurement-induced dephasing,ac Stark effect,andheating.It is showed that pulse-mode readout is a promising measurement scheme to mitigate qubit dephasing while minimizing theneed for bulky circulators.Our work provides key insights intomitigating decoherence from microwave-pumped preamplifiers,which will be critical for advancing large-scale quantum computers.

关键词： TWPA Microwave pump Dephasing Pulse mode

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

拖拉机液压功率分流无级变速箱设计

引用

中国农机化学报 2024年第1期45卷 138-143,192页

作者：徐钊睿赵业慧刘风平薛丽君杨延强王光明山东农业大学机械与电子工程学院山东泰安271018 山东潍坊鲁中拖拉机有限公司山东潍坊261000 山东农业大学信息科学与工程学院山东泰安271018 山东省园艺机械与装备重点实验室山东泰安271018

为适应拖拉机复杂的作业工况并提高其作业效率,提出一种单行星输入耦合型液压功率分流无级变速箱的设计方案。依据拖拉机配套动力与速度要求进行变速箱参数设计与结构设计,基于SolidWorks构建变速箱虚拟样机,并基于AMESim构建变速箱传... 详细信息

为适应拖拉机复杂的作业工况并提高其作业效率,提出一种单行星输入耦合型液压功率分流无级变速箱的设计方案。依据拖拉机配套动力与速度要求进行变速箱参数设计与结构设计,基于SolidWorks构建变速箱虚拟样机,并基于AMESim构建变速箱传动系统模型,对其整机调速特性进行分析。研究结果表明:该变速箱可以实现拖拉机在0~30 km/h范围内的无级调速,且在犁耕等重点工况下具有较小的液压分流功率从而实现节能;该变速箱在段位切换时需要将泵马达排量比从1快速调制-0.85,通过快速的马达反向实现行星排复位与换段前后的速度衔接。对我国无级变速拖拉机的国产化设计与应用具有一定的参考价值。

关键词：拖拉机无级变速箱功率分流仿真 AMESim

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

基于SKIP宏程序编程CNC无线测头在线智能检测系统设计

引用

机床与液压 2024年第2期52卷 120-126页

作者：薛明黄文龙刘惠强吴光明胡毅业赵铎东莞市技师学院智能制造学院广东东莞523460 东莞市腾信精密仪器有限公司广东东莞523380

针对数控铣削加工精密零件尺寸精度测量时,因离线测量易产生测量误差、效率低、成本高等问题,通过赋值相关检测路径及补偿的参数,编写零件在线检测及误差补偿宏程序,开发了基于三菱M70数控系统跳过指令SKIP在线检测与误差补偿宏程序控... 详细信息

针对数控铣削加工精密零件尺寸精度测量时,因离线测量易产生测量误差、效率低、成本高等问题,通过赋值相关检测路径及补偿的参数,编写零件在线检测及误差补偿宏程序,开发了基于三菱M70数控系统跳过指令SKIP在线检测与误差补偿宏程序控制系统。应用结果表明:该系统在线检测重复定位精度能达到0.001~0.003 mm,能适用于精密零件数控铣削加工,具有一定的推广使用价值。

关键词： CNC无线测头在线检测误差补偿 SKIP信号宏程序

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

Characterizing noise correlation and enhancing coherence via qubit motion

引用

Fundamental Research 2021年第1期1卷 10-15页

作者： Jiaxiu Han Zhiyuan Li Jingning Zhang Huikai Xu Kehuan Linghu Yongchao Li Chengyao Li Mo Chen Zhen Yang Junhua Wang Teng Ma guangming xue Yirong Jin Haifeng Yu Beijing Academy of Quantum Information Sciences Beijing 100193China

The identification of spacial noise correlation is of critical importance in developing error-corrected quantum devices,but it has barely been studied so far.In this work,we utilize an effective method called qubit motion,to efficiently determine the noise correlations between any pair of qubits in a 7-qubit superconducting quantum system.The noise correlations between the same pairs of qubits are also investigated when the qubits are at distinct operating frequencies.What’s more,in this multi-qubit system with the presence of noise correlations,we demonstrate the enhancing effect of qubit motion on the coherence of logic qubits,and we propose a Motion-CPMG operation sequence to more efficiently protect the logic state from decoherence,which is experimentally demonstrated to extend the coherence time of logic qubits by nearly one order of magnitude.

关键词： Qubit motion Noise correlation Decoherence CPMG Quantum error correction

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

116例儿童过敏性咳嗽发病特点及证型分布研究

引用

国医论坛 2024年第2期39卷 26-29页

作者：袁洋陈光明徐玲杨丽霞马海龙闫雪南京中医药大学附属盐城中医院江苏盐城224001

目的:探讨盐城地区儿童过敏性咳嗽发病特点及中医证型分布情况,为临床治疗提供参考。方法:将符合纳入标准的儿童过敏性咳嗽患儿116例,通过观察表采集病因、饮食、症状、体征、舌苔、脉象、既往史、家族史、合并症等资料,进行统计学分析... 详细信息

目的:探讨盐城地区儿童过敏性咳嗽发病特点及中医证型分布情况,为临床治疗提供参考。方法:将符合纳入标准的儿童过敏性咳嗽患儿116例,通过观察表采集病因、饮食、症状、体征、舌苔、脉象、既往史、家族史、合并症等资料,进行统计学分析。结果:在116例过敏性咳嗽患儿中,证型分布由高到低依次是气阴两虚、风寒咳嗽、肺脾气虚、痰湿咳嗽、风热咳嗽、肝火犯肺、痰热咳嗽、燥邪犯肺;其证的要素分布由高到低依次是气虚、风邪、阴虚、痰邪、热邪、寒邪、肺虚、脾虚、湿邪、肝火、燥邪;其体质分布由高到低依次是特禀质、气虚质、阴虚质、痰湿质、阳虚质、食积郁热质、平和质、血虚质;病因与受凉、先天禀赋不足、接触异味、恣食肥甘厚味、饮食生冷等密切相关。结论:盐城地区儿童过敏性咳嗽的发生,实证以风寒咳嗽、虚证以气阴两虚为最常见证型;证候要素中以气虚、风邪、阴虚、痰邪居多;体质与特禀质、气虚质、阴虚质等密切相关;受凉、先天禀赋不足是其主要病因。

关键词：过敏性咳嗽儿童发病特点证型分布临床研究

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

In-situ horizontal extrusion test of herbaceous root–soil with different root types

引用

Journal of Earth Science 2022年

作者： Fangcui Liu Shengwen Qi Shenglin Qi Xiaokun Hou Yanrong Li guangming Luo Lei xue xueliang Wang Juanjuan Sun Songfeng Guo Bowen Zheng Key Laboratory of Shale Gas and Geoengineering， Institute of Geology and Geophysics， Chinese Academy of Sciences University of Chinese Academy of Sciences Innovation Academy for Earth Science， CAS China-Pakistan Joint Research Center on Earth Sciences， CAS-HEC Government Affairs Service Center of Beijing Municipal Water Affairs Bureau Department of Earth Sciences and Engineering， Taiyuan University of Technology

The influence of different types of roots on the soil is complex and still remains unclear. Four in-situ extrusion tests were conducted on two types of root systems， namely fibrous and tap root system， for three plants (i.e. Eleusine indica， Potentilla anserine and Artemisia argyi)， according to the classification in Botany， and the thrust–displacement curves and failure patterns of different samples were analysed by comparison to fill the aforementioned gap. Results reveal that the roots can reduce the characteristics of soil brittleness and enhance its capability to resist large deformation， and different root types contribute different effects on the strain-hardening behaviour of the root–soil mass. The contribution of the fibrous root system on strength is limited， whilst the tap root system substantially enhances strength and stiffness. Results of failure patterns show that fibrous and tap root systems affect soil solidification and surface cracking reduction. However， the effect of the tap root system depends on the composition of lateral and tap roots: long and rich lateral roots are effective for resisting the creation of cracks， but thick tap roots with few and thin lateral roots may lead to several surface cracks.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Effects of high intensity pulsed electric fields on yield and chemical composition of rose essential oil

引用

International Journal of Agricultural and Biological Engineering 2017年第3期10卷 295-301页

作者： Zhou Yajun xue Changmei Zhang Susu Yao guangming Zhang Ling Wang Shujie Department of Food Science and Engineering Jilin UniversityChangchun 130062China College of Biological and Agricultural Engineering Jilin UniversityChangchun 130025China

High intensity pulsed electric fields(PEF)combined with distillation was used to extract essential oil from rose.Three main parameters,namely electric field intensity,pulse number and distillation times,which can affect the efficiency of extraction,were optimized.Then,in order to demonstrate the feasibility of the method,oil obtained under optimal conditions was compared quantitatively and qualitatively with that obtained by conventional hydro distillation.Considering the extraction yield,the optimal parameters combination was obtained with electric field intensity of 20 kV/cm,pulse number of 8 and distillation time of 2 h.PEF treatment had no significant influence on the quality of essential oils.However,there was an increase in methyl eugenol percentage,which is a disadvantage from qualitative point of view.

关键词： rose hydro distillation pulsed electric fields PEF extraction essential oil

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

基于人工智能的全自动化一站式CT血流储备分数在冠心病患者中的诊断与预后价值

引用

Science Bulletin 2024年第10期69卷 1472-1485页

作者：郭邦俊姜孟春郭翔唐春香钟健陆梦洁刘春雨张晓蕾乔红艳周帆许棚棚薛艺郑敏文侯阳王怡宁张佳胤张波张代民徐磊胡秀华周长圣李建华杨志文毛新生卢光明张龙江 Department of Radiology Jinling HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing 210002China Department of Radiology Affiliated Hospital of Jining Medical UniversityJining 272007China Department of Radiology Xijing HospitalFourth Military Medical UniversityXi’an 733399China Department of Radiology Shengjing Hospital of China Medical UniversityShenyang 110022China Department of Radiology Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100005China Institute of Diagnostic and Interventional Radiology and Department of CardiologyShanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai 200235China Department of Radiology Jiangsu Taizhou People’s HospitalTaizhou 225399China Department of Cardiology Nanjing First HospitalNanjing Medical UniversityNanjing 210012China Department of Radiology Beijing Anzhen HospitalCapital Medical UniversityBeijing 100029China Department of Radiology Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310020China Department of Cardiology Jinling HospitalAffiliated Hospital of Medical SchoolNanjing UniversityNanjing 210002China Shukun(Beijing)Network Technology Co. Ltd.Beijing 102200China

Currently,clinically available coronary CT angiography(CCTA)derived fractional flow reserve(CT-FFR)is time-consuming and complex.We propose a novel artificial intelligence-based fully-automated,on-site CT-FFR technology,which combines the automated coronary plaque segmentation and luminal extraction model with reduced order 3 dimentional(3D)computational fluid dynamics.A total of 463 consecutive patients with 600 vessels from the updated China CT-FFR study in Cohort 1 undergoing both CCTA and invasive fractional flow reserve(FFR)within 90 d were collected for diagnostic performance evaluation.For Cohort 2,a total of 901 chronic coronary syndromes patients with index CT-FFR and clinical outcomes at 3-year follow-up were retrospectively analyzed.In Cohort 3,the association between index CT-FFR from triple-rule-out CTA and major adverse cardiac events in patients with acute chest pain from the emergency department was further evaluated.The diagnostic accuracy of this CT-FFR in Cohort 1 was 0.82 with an area under the curve of 0.82 on a per-patient level.Compared with the manually dependent CT-FFR techniques,the operation time of this technique was substantially shortened by 3 times and the number of clicks from about 60 to 1.This CT-FFR technique has a highly successful(>99%)calculation rate and also provides superior prediction value for major adverse cardiac events than CCTA alone both in patients with chronic coronary syndromes and acute chest pain.Thus,the novel artificial intelligencebased fully automated,on-site CT-FFR technique can function as an objective and convenient tool for coronary stenosis functional evaluation in the real-world clinical setting.

关键词： Artificial intelligence Coronary CTA CT-derived fractional flow reserve Fully-automated Outcomes

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

Skeletal muscle cell apoptosis following motor nerve injury versus sensory nerve injury

引用

Neural Regeneration Research 2011年第3期6卷 224-230页

作者： Zhao, Lei Xu, Ruisheng Jiang, Shenyang Lue, guangming Yan, Zhiqiang Sun, Junming Wang, Ling xue, Ye Jiang, Donglin Nantong Univ Affiliated Hosp 3 Clin Cent Lab Wuxi 214041 Jiangsu Peoples R China Nantong Univ Affiliated Hosp 3 Dept Orthoped Wuxi 214041 Jiangsu Peoples R China Nantong Univ Jiangsu Prov Key Lab Neuroregenerat Nantong 223001 Jiangsu Peoples R China Shanghai Jiao Tong Univ Inst Mechanobiol & Med Engn Shanghai 200030 Peoples R China

Skeletal muscle atrophy inevitably occurs in denervated skeletal muscle, and cell apoptosis plays an important role in skeletal muscle atrophy and degeneration. The present study established rat models of simple nerve injury by transecting the ventral or dorsal spinal nerve root and observed rat skeletal muscle cell apoptosis following simple motor nerve injury versus simple sensory nerve injury. Following skeletal muscle denervation for 10 weeks, cell apoptosis was detected in skeletal muscle, which was accompanied by obvious changes in rat behavior and electrophysiological responses. In addition, changes in cross-sectional area and average gray-scale of motor endplates of the gastrocnemius muscle were analyzed following sciatic nerve injury and motor nerve injury. Cell nuclei in denervated skeletal muscle tissue were more densely arranged than in normal skeletal muscle tissue. Cell nuclei were most dense in the sciatic nerve injury group, followed by the motor nerve injury group and the sensory nerve injury group. Fas/FasL expression and the number of apoptotic cells increased in denervated skeletal muscle, and apoptosis-related changes were observed. These findings suggested that motor and sensory nerves provided trophic actions following skeletal muscle and motor nerve injury, resulting in a greater influence on skeletal muscle atrophy than sensory nerve injury. Therefore, reconstruction of motor nerves should be preferentially considered for treating denervation-induced skeletal muscle atrophy.

关键词： apoptosis motor nerve rats sensory nerve skeletal muscle atrophy

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：