检索结果-南通市图书馆

MPC‑Based Coordinated Control of Gear Shifting Process for a Power‑split Hybrid Electric Bus with a Clutchless AMT

Chinese Journal of Mechanical Engineering 2022年第6期35卷 377-389页

作者： Tong Liu Xiaohua zeng Dafeng song State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130025China

Two-speed clutchless automated manual transmission(AMT)has been widely implemented in electric vehicles for its simple structure and low *** contrast,due to the complex response characteristics of powertrain,utilizing clutchless AMT in a hybrid power system comes with complex coordination control *** order to address these issues,a power-split hybrid electric bus with two-speed clutchless AMT is studied in this paper,and a coordinated control method based on model predictive control(MPC)is used in gear shifting control strategy(GSCS)to improve gear shifting quality and reduce system ***,the dynamic model of power sources and other main powertrain components including a single planetary gear set and AMT are established on the basis of data-driven and mechanism modeling ***,the GSCS is put forward using the segmented control idea,and the shifting process is divided into five phases,including(I)unloading of drive motor,(II)shifting to neutral gear,(III)active speed synchronization by drive motor,(IV)engaging to new gear,and(V)resuming the drive motor’s power,among which the phases I and V have evident impact on the system ***,the MPC-based control method is adopted for these phases,and the fast compensation of driving torque is realized by combining the prediction model and quadratic programming *** simulation results show that the proposed GSCS can effectively reduce shift jerk and improve driving *** research proposes a coordinated control strategy of two-speed clutchless AMT,which can effectively improve the smoothness of gear shifting and provides a reference for the application of two speed clutchless AMT in power-split hybrid powertrains.

关键词： Power-split hybrid electric bus Shift jerk Model predictive control

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

The biogenesis,function and clinical significance of circular RNAs in breast cancer

引用

Cancer Biology & Medicine 2022年第1期19卷 14-29页

作者： yan zeng Yutian Zou Guanfeng Gao Shaoquan Zheng song Wu Xiaoming Xie Hailin Tang Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhou 510060China

Circular RNAs(circ RNAs)are noncoding RNAs that form covalently closed loop *** RNAs are dysregulated in cancer and play key roles in tumorigenesis,diagnosis,and tumor *** RNAs function as competing endogenous RNAs or micro RNA sponges that regulate transcription and splicing,binding to proteins,and *** RNAs may serve as novel biomarkers for cancer diagnosis,and they show potential as therapeutic targets in cancers including breast cancer(BC).In women,BC is the most common malignant tumor worldwide and the second leading cause of cancer *** evidence indicates that circ RNAs play a critical role in BC,the mechanisms regulating the function of circ RNAs in BC remain poorly ***,we provide literature review aiming to clarify the role of circ RNAs in BC and summarize the latest *** provide a systematic overview of the biogenesis and biological functions of circ RNAs,elaborate on the functional roles of circ RNAs in BC,and highlight the value of circ RNAs as diagnostic and therapeutic targets in BC.

关键词： Breast cancer circular RNAs carcinogenesis tumor biomarker targeted therapy

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

Non-pharmaceutical intervention and pain management situation for neonatal analgesia

引用

Frontiers of Nursing 2020年第4期7卷 299-305页

作者： Zi zeng yan-Xia Duan Guo-Min song Henan Vocational College of Nursing AnyangHenan 455000China Department of Nursing Tianjin HospitalTianjin 300211China

Neonatal pain management is an important issue which should have great *** and more researches have proved that neonates can feel pain when undergoes painful procedures such as vaccination,heel stick,and so on,and it will result in shortterm and long-term *** it is very important to manage neonatal *** article summarized some non-pharmaceutical interventions,including sucrose or glucose,non-nutritional sucking(NNS),breastfeeding,facilitated tucking(FT),kangaroo mother care(KMC),swaddling,heel warming,sensorial saturation(SS),and music therapy,which showed obvious effects for neonatal *** addition,this article summarized the progress of neonatal pain intervention in various countries and showed that many countries have not paid enough attention to this problem,while some countries have carried out promotion programs for neonatal pain management which give some clinical enlightenment to our country that we need to pay more attention to this problem.

关键词： neonatal pain pain management non-pharmaceutical intervention

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

阿拉善-华北北缘晚古生代-早中生代岩浆作用:对古亚洲洋俯冲-闭合过程的制约

引用

岩石学报 2025年第1期41卷 66-90页

作者：曾浩宋东方肖文交李普庆中国科学院地质与地球物理研究所岩石圈演化与环境演变全国重点实验室北京100029 中国科学院地球科学研究院北京100029 中国科学院新疆生态与地理研究所干旱区生态安全与可持续发展全国重点实验室乌鲁木齐830011 中国科学院大学地球与行星科学学院北京100049

位于中亚造山带南部的阿拉善-华北北缘地区保存了丰富的晚古生代-早中生代岩浆记录,为理解古亚洲洋从俯冲至闭合的构造演化过程提供了关键信息。本文对位于内蒙古西部的甘其毛都地区的4个侵入体进行了岩相学、地球化学、锆石U-Pb年代学... 详细信息

位于中亚造山带南部的阿拉善-华北北缘地区保存了丰富的晚古生代-早中生代岩浆记录,为理解古亚洲洋从俯冲至闭合的构造演化过程提供了关键信息。本文对位于内蒙古西部的甘其毛都地区的4个侵入体进行了岩相学、地球化学、锆石U-Pb年代学和Lu-Hf同位素分析。锆石U-Pb定年表明这些岩体分别形成于早二叠世(283±3Ma、273±5Ma、272±5Ma)和中三叠世(238±3Ma)。早二叠世岩体以石英闪长岩和闪长玢岩为主,富集轻稀土与大离子亲石元素,亏损高场强元素Nb、Ta等,Hf同位素显著亏损(-4.0~+15.6)。它们可能是由俯冲板片流体交代地幔楔部分熔融形成的基性岩浆经分离结晶演化而成。中三叠世侵入体为花岗闪长岩,轻重稀土元素强烈分异,锆石ε_(Hf)(t)值均为正值(+5.0~+8.5),可能代表了碰撞造山阶段新生下地壳物质部分熔融的产物。在此基础之上,本文系统收集并分析了阿拉善-华北北缘地区晚古生代-早中生代岩浆岩的时空分布规律与地球化学特征,以限定其构造背景与深部动力学过程。结合前人研究成果提出:石炭纪时期,古亚洲洋向南俯冲至阿拉善-华北克拉通之下并不断向北后撤;至早二叠世,俯冲板片转变为前进式俯冲,整体处于挤压环境,发育大规模岩浆活动与弧背前陆盆地;早-中三叠世,古亚洲洋闭合,阿拉善-华北克拉通沿索伦缝合带与北侧的中亚弧增生体系发生碰撞-拼贴。

关键词：阿拉善华北北缘晚古生代-早中生代古亚洲洋俯冲-闭合

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

Metagenomic Analysis of Environmental Samples from Wildlife Rescue Station at Poyang Lake, China

引用

Biomedical and Environmental Sciences 2023年第7期36卷 595-603页

作者： LIU Jia LI Xi yan song Wen Tao zeng Xiao Xu LI Hui yanG Lei WANG Da yan National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing 102206China Nanchang Center for disease prevention and control Nanchang 330038JiangxiChina

Objective To improve the understanding of the virome and bacterial microbiome in the wildlife rescue station of Poyang Lake,*** Ten smear samples were collected in March *** sequencing was performed to delineate bacterial and viral *** analysis was performed using the Kraken2 and Bracken methods.A maximum-likelihood tree was constructed based on the RNA-dependent RNA polymerase(RdRp)region of *** We identified 363 bacterial and 6 viral families.A significant difference in microbial and viral abundance was found between samples S01–S09 and *** S01–S09,members of Flavobacteriia and Gammaproteobacteria were the most prevalent,while in S10,the most prevalent bacteria class was *** S01–S09,members of Myoviridae and Herelleviridae were the most prevalent,while the dominant virus family of S10 was *** full genome of the pigeon mesivirus-like virus(NC-BM-233)was recovered from S10 and contained an open reading frame of 8,124 *** showed the best hit to the pigeon mesivirus 2 polyprotein,with 84.10%amino acid *** analysis showed that RdRp clustered into Megrivirus *** This study provides an initial assessment of the bacteria and viruses in the cage-smeared samples,broadens our knowledge of viral and bacterial diversity,and is a way to discover potential pathogens in wild birds .

关键词： Metagenomics Virome Megrivirus B Picornaviridae Poyang Lake Wildlife Rescue Station Wild Bird

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

CFD-DEM study of impacts of the porous distributor medium on fluidization characteristics of a 2D-fluidized bed

引用

Particuology 2024年第4期87卷 54-73页

作者： Fei Wang Yishan zeng Hao yan School of Mechanical Engineering Hefei University of TechnologyHefei230009China

Gas-solid bubbling fluidized beds are widely used in chemical,energy,construction,and other industrial fields due to their excellent fluidization performance.2D-fluidized beds with planar rectangular columns of finite thickness are widely used in fluidized bed studies,and it is essential for understanding the hydrodynamics of gas-particle ***,the distributor(porous medium)at the bottom of the bed has a crucial influence on the fluidization performance of the 2D-fluidized *** this work,the fluidization mechanism and gas-solid dynamic characteristics of the fluidized bed under three porous media are studied by CFD-DEM coupled with the porous medium model,and the accuracy of numerical simulation is verified by a high-speed photography *** show that with the increase in the flow resistance of the porous medium,the average and standard deviation of the bubble diameter decrease,and the time and position of particles in the dead zone to participate in the core-annular flow *** a low fluidization velocity,the dead zone in the bed can be considerably reduced by increasing the flow resistance.

关键词： Fluidized bed CFD-DEM Porous medium Bubble dynamics Solid mixing

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

Detecting Iris Liveness with Batch Normalized Convolutional Neural Network

引用

Computers, Materials & Continua 2019年第2期58卷 493-504页

作者： Min Long yan zeng Changsha University of Science and Technology Changsha410014China Hunan Provincial Key Laboratory of Intelligent Processing of Big Data on Transportation Changsha410014China

Aim to countermeasure the presentation attack for iris recognition system,an iris liveness detection scheme based on batch normalized convolutional neural network(BNCNN)is proposed to improve the reliability of the iris authentication *** BNCNN architecture with eighteen layers is constructed to detect the genuine iris and fake iris,including convolutional layer,batch-normalized(BN)layer,Relu layer,pooling layer and full connected *** iris image is first preprocessed by iris segmentation and is normalized to 256×256 pixels,and then the iris features are extracted by *** these features,the genuine iris and fake iris are determined by the decision-making *** normalization technique is used in BNCNN to avoid the problem of over fitting and gradient disappearing during *** experiments are conducted on three classical databases:the CASIA Iris Lamp database,the CASIA Iris Syn database and Ndcontact *** results show that the proposed method can effectively extract micro texture features of the iris,and achieve higher detection accuracy compared with some typical iris liveness detection methods.

关键词： Iris liveness detection batch normalization convolutional neural network biometric feature recognition

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

Single-photon detection and its applications

引用

Science China(Physics,Mechanics & Astronomy) 2014年第7期57卷 1218-1232页

作者： LIANG yan zeng HePing Shanghai Key Laboratory of Modern Optical System Engineering Research Center of Optical Instrument and System Ministry of Education School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technology State Key Laboratory of Precision Spectroscopy East China Normal University

A single-photon detector is an extremely sensitive device capable of registering photons,offering essential technical support for optics quantum information *** review herein our recent experimental progress in the development and application of single-photon detection *** based on advanced self-differencing,low-pass filtering,frequency up-conversion and photon-number-resolving are introduced for attaining high-speed,high-efficiency,low-noise single-photon detection at infrared *** advantages of high-speed single-photon detection are discussed in some applications,such as the laser ranging and quantum key *** photon-number-resolving detection is shown to support efficient quantum random number generation.

关键词： quantum optics photodetection avalanche photodiode frequency up-conversion

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

The landing of parameter rays at non-recurrent critical portraits Dedicated to the Memory of Professor Lei Tan

引用

Science China Mathematics 2018年第12期61卷 2267-2282页

作者： yan Gao Jinsong zeng School of Mathematics Sichuan University School of Mathematics and Information Science Guangzhou University

Based on the distortion theory developed by Cui and Tan (2015), we prove the landing of every parameter ray at critical portraits coming from non-recurrent polynomials, thereby generalizing a result of Kiwi (2005).

关键词： critical portraits non-recurrent impressions

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

Dynamic modeling and damage analysis of debris cloud fragments produced by hypervelocity impacts viaimage processing

引用

Frontiers of Information Technology & Electronic Engineering 2022年第4期23卷 555-570页

作者： Ru zeng yan song Weizhen LV Department of Control Science and Engineering University of Shanghai for Science and TechnologyShanghai200093China

It is always a challenging task to model the trajectory and make an efficient damage estimation of debris clouds produced by hypervelocity impact(HVI)on thin-plates due to the difficulty in obtaining high-quality fragment images from *** improve the damage estimation accuracy of HVIs on a typical double-plate Whipple shield configuration,we investigate the distributive characteristic of debris clouds in successive shadowgraphs using image processing techniques and traditional numerical *** aim is to extract the target movement parameters of a debris cloud from the acquired shadowgraphs using image processing techniques and construct a trajectory model to estimate the damage with desirable *** HVI experiments,eight successive frames of fragment shadowgraphs are derived from a hypervelocity sequence laser shadowgraph imager,and four representative frames are selected to facilitate the subsequent feature ***,using image processing techniques,such as denoising and segmentation techniques,special fragment features are extracted from successive *** on the extracted information,image matching of debris is conducted and the trajectory of debris clouds is modeled according to the matched debris.A comparison of the results obtained using our method and traditional numerical methods shows that the method of obtaining hypervelocity impact experimental data through image processing will provide critical information for improving numerical ***,an improved estimation of damage to the rear wall is presented based on the constructed *** proposed model is validated by comparing the estimated damage to the actual damage to the rear wall.

关键词： Debris clouds Hypervelocity impact Image processing Damage estimation

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：