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城市交通可持续发展策略的思考

现代城市研究 2004年第9期19卷 70-72页

作者：陈建凯杨涛广东省深圳市规划设计研究江苏南京市交通规划研究所

城市交通发展策略具有长期性和稳定性,对引导交通系统的健康发展具有重要的指导意义。结合国内外的先进经验、交通发展趋势等阐述了我国建立可持续城市交通系统过程中应予以坚持的若干重要策略,如土地利用与城市交通的协调、适当控制机... 详细信息

城市交通发展策略具有长期性和稳定性,对引导交通系统的健康发展具有重要的指导意义。结合国内外的先进经验、交通发展趋势等阐述了我国建立可持续城市交通系统过程中应予以坚持的若干重要策略,如土地利用与城市交通的协调、适当控制机动车拥有和使用以及加强交通需求管理等。

关键词：可持续发展策略可持续城市城市交通发展交通系统交通发展土地利用先进经验引导中国过程

Optimization of ECAP-RAP process for preparing semisolid billet of 6061 aluminum alloy

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International Journal of Minerals,Metallurgy and Materials 2020年第6期27卷 792-800页

作者： Zu-jian yang kai-kun Wang Yan yang School of Materials Science and Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Jinchang 737100China

6061 aluminum alloy semisolid billet was prepared by the equal-channel angular processing(ECAP)-recrystallization and partial(RAP)process(a combination of equal-channel angular processing and recrystallization and partial remelting).The effects of different process parameters on the alloy microstructure were studied and the quantitative relationship between the process parameters and microstructure was established by response surface methodology(RSM)to optimize the process *** to the orthogonal test,the holding temperature and holding time of the four ECAP-RAP process parameters were found to have the greatest impact on the microstructural characteristics,including average grain size and average shape *** RSM,it was also found that when the average grain size or the average shape factor is optimized separately,another will be *** the two indexes were simultaneously considered,the optimal process parameters were found to be a holding temperature of 623°C and holding time of 13 min,and the corresponding average grain size and average shape factor were 35.97μm and 0.8535,***,comparing the experimental and predicted values,the reliability of the established response surface model was verified.

关键词： 6061 aluminum alloy equal-channel angular pressing semisolid microstructure response surface methodology

A video conferencing system based on SDN-enabled SVC multicast

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Frontiers of Information Technology & Electronic Engineering 2016年第7期17卷 672-681页

作者： En-zhong yang Lin-kai ZHANG Zhen YAO jian yang School of Information Science and Technology University of Science and Technology of China

Current typical video conferencing connection is bridged by a multipoint control unit(MCU),which may cause large delay and communication bottleneck for the whole *** the development of network technology,a video conferencing system can be implemented based on software-defined networking(SDN),which makes the service controllable and improves the scalability and ***,a video encoding method called scalable video coding(SVC) can also *** this paper,we propose a video conferencing architecture based on SDN-enabled SVC multicasting,which discards the traditional Internet group management protocol(IGMP) and *** system implements SVC multicast streaming to satisfy different device capabilities of various conference *** SDN controller is responsible for dynamically managing and controlling the layers of a video stream when a conference member faces network ***,a conference manager is designed to facilitate the management of the conference *** results show that our system can not only provide a flexible and controllable video delivery,but also reduce the network usage while guaranteeing the quality of service(QoS) of video conferencing.

关键词： Software-defined networking(SDN) Multicast Scalable video coding Video conferencing system

Association of stent thrombectomy and conventional treatment with neuroprotection, complications, anxiety, and depression in acute ischemic stroke patients

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World Journal of Psychiatry 2025年第1期15卷 72-82页

作者： kai-Jie yang Jia-jian Huang Cai-Xia Xuan Department of Neurology Qinzhou Second People's HospitalQinzhou 535000Guangxi Zhuang Autonomous RegionChina

BACKGROUND Acute ischemic stroke(AIS)is an abrupt blood flow cessation to a specific brain region within a vascular zone,causing a subsequent decline in neurological *** thrombectomy is a recently established technique for treating *** provides the benefits of being a relatively simple and safe procedure,capable of partially enhancing a patient’s ***,some patients may experience endothelial damage and recurrent thrombosis,with clinical outcomes that are not always ***,the efficacy of this method remains *** To survey the association of stent thrombectomy vs standard treatment with neurological function protection,complications,and short-term prognosis in patients diagnosed with *** This study assigned 90 patients with AIS to the observation and control groups(n=45 patients)from December 2020 to December *** thrombectomy was conducted in the observation group,whereas routine treatment was provided to the control *** study assessed the therapeutic outcomes of two groups,including a comparison of their neurological function,living ability,anxiety and depression status,plaque area,serum inflammatory factors,serum Smur100βprotein,neuron-specific enolase(NSE),homocysteine(Hcy),and vascular endo-thelial ***,the incidence of complications was calculated and analyzed for each *** The total effective rate of treatment was 77.78%and 95.56%in the control and observation groups,*** 8 weeks of treatment,the scores on the National Institutes of Health Stroke Scale,Hamilton Anxiety Scale,and Hamilton Depression Scale decreased remarkably;the Barthel index increased remarkably,with better improvement effects of the scores in the observation group(P<0.05);total cholesterol,triglyceride,C-reactive protein,and plaque area lessened remarkably,with fewer patients in the observation group(P<0.05);S-100βprotein,NSE,and Hcy levels lessened remarkably,with fewer patients in

关键词： Stent thrombectomy Acute ischemic stroke Neurological function Complications Short-term prognosis

二甲基-β-丙酸噻亭对凡纳滨对虾幼虾生长、蜕壳和渗透调节的影响

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水产学报 2006年第3期30卷 404-409页

作者：赵红霞曹俊明周萌吴建开朱选杨大伟广东省农业科学院畜牧研究所广东省农业科学院畜牧研究所广东广州510640

在低盐度5~6和水温25~29℃条件下,分别投喂1种对照饲料和7种添加二甲基-β-丙酸噻亭(DMPT)(添加量分别为100、2003、00、400、5006、00和***-1)的试验饲料,饲养初始体重约每尾0.77g的凡纳滨对虾56d,观察DMPT对凡纳滨对虾的生长、蜕壳和... 详细信息

在低盐度5~6和水温25~29℃条件下,分别投喂1种对照饲料和7种添加二甲基-β-丙酸噻亭(DMPT)(添加量分别为100、2003、00、400、5006、00和***-1)的试验饲料,饲养初始体重约每尾0.77g的凡纳滨对虾56d,观察DMPT对凡纳滨对虾的生长、蜕壳和渗透压调节的影响。实验结果表明,添加DMPT的各组凡纳滨对虾增重率随着DMPT添加量的增加,呈现先升后降的趋势,在***-1凡纳滨对虾增重率达到最高,显著高于对照组;与对照组相比,各试验组凡纳滨对虾的饲料系数均不同程度降低,***-1DMPT组凡纳滨对虾的饲料系数降低达到显著水平。添加DMPT对凡纳滨对虾的蜕壳次数无显著影响。除***-1DMPT组外,DMPT组凡纳滨对虾的渗透压均明显低于对照组,其中,添加300和***-1组凡纳滨对虾的渗透压降低呈现显著性差异。凡纳滨对虾肌肉粗蛋白和粗脂肪含量随着DMPT水平增加呈现出先上升后下降的趋势。粗蛋白含量在DMPT添加量为***-1时达到最高,粗脂肪含量在DMPT添加量为***-1时达到最高,均显著高于对照组。以增重率为判定指标,DMPT在凡纳滨对虾饲料中的适宜添加量为***-1。

关键词：凡纳滨对虾二甲基-β-丙酸噻亭生长蜕壳渗透调节

Variability Analysis for a Two-station Queueing Network in Heavy Traffic with Arrival Processes Driven by Queues

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 445-466页

作者： jian CAO Yong-jiang GUO kai-ming yang School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China

The law of the iterated logarithm(LIL)for the performance measures of a two-station queueing network with arrivals modulated by independent queues is developed by a strong approximation *** convenience,two arrival processes modulated by queues comprise the external system,all others are belong to the internal *** is well known that the exogenous arrival has a great influence on the asymptotic variability of performance measures in *** the considered queueing network in heavy traffic,we get all the LILs for the queue length,workload,busy time,idle time and departure processes,and present them by some simple functions of the primitive *** LILs tell us some interesting insights,such as,the LILs of busy and idle times are zero and they reflect a small variability around their fluid approximations,the LIL of departure has nothing to do with the arrival process,both of the two phenomena well explain the service station’s situation of being busy all the *** external system shows us a distinguishing effect on the performance measures:an underloaded(overloaded,critically loaded)external system affects the internal system through its arrival(departure,arrival and departure together).In addition,we also get the strong approximation of the network as an auxiliary result.

关键词： two-station queueing network the law of the iterated logarithm(LIL) strong approximation fluid approximation

Intramuscular hematoma in rhabdomyolysis patients treated with low-molecular-weight heparin: Report of two cases

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World Journal of Clinical Cases 2021年第12期9卷 2838-2844页

作者： Shi-yang Yuan kai-Fan Xie jian yang Department of Critical Care Medicine Nanping First Hospital Affiliated to Fujian Medical UniversityNanping 353000Fujian ProvinceChina Department of Respiratory Medicine 907 Hospital of the Joint Logistics TeamNanping 353000Fujian ProvinceChina

BACKGROUND Rhabdomyolysis is a serious complication of heat *** that in acute kidney injury,the risk of muscle bleeding in rhabdomyolysis is often ignored and can substantially increase via the widespread use of anticoagulants,leading to the formation of intramuscular *** SUMMARY During the summer,a middle-aged man and an elderly man were diagnosed with heat stroke,rhabdomyolysis,and acute renal ***-dose enoxaparin sodium was initiated for prophylaxis of deep vein thrombosis after the disease was stabilized with continuous renal replacement *** that,the patients'hemoglobin decreased progressively,and no obvious intracranial,thoracic,digestive,or skin bleeding tendency was ***,one of the patients had hip muscle pain,and computed tomography and color ultrasound confirmed that the patients separately had lumbar back and hip intermuscular *** discontinuation of anticoagulant drugs and monitoring of the steady increase in hemoglobin,the intermuscular hematomas were gradually *** the use of prophylactic anticoagulation therapy,the patients'hemoglobin showed a progressive downward *** formation in the lumbosacral and buttock muscles was confirmed after excluding bleeding in typical regions(such as the digestive tract,thoracic cavity,and abdominal cavity).Anticoagulant drugs were discontinued immediately,and nutritional support was ***,the hemoglobin levels gradually increased,and the hematoma volumes gradually *** Patients with rhabdomyolysis have a risk of muscle bleeding,and inappropriate use of anticoagulants may lead to an increased risk or even to the formation of an intermuscular hematoma. When continuous blood loss is found in the body, thepossibility of bleeding in the muscles and more typical sites should be considered.

关键词： Rhabdomyolysis Heat stroke Anticoagulant drugs Intramuscular hematoma Continuous renal replacement therapy Case report

Microstructural evolution and aging behavior of Mg-4.5Y-2.5Nd-1.0Gd-0.5Zr alloys with different Zn additions

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Rare Metals 2021年第8期40卷 2188-2196页

作者： Zheng Tian Qiang yang kai Guan Zhan-Yi Cao jian Meng Key Laboratory of Automobile Materials of Ministry of Education Department of Materials Science and EngineeringJilin UniversityChangchun130025China State Key Laboratory of Rare Earth Resources Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China

Microstructures and mechanical properties of Mg-4.5 Y-2.5 Nd-1.0 Gd-0.5 Zr-xZn(x=0,0.5,1.0,and 1.5;wt%)alloys under as-cast and peak-aged states were investigated in this *** results indicate that the intermetallic phase components are closely dependent on Zn *** as-cast state,the dominant eutectic phase is Mg5 RE in the alloys with 0 wt%and 0.5 wt%Zn additions while Mg5 RE,18 R-and 14 H-LPSO(long period stacking ordered)phases in the alloys with 1.0 wt%and1.5 wt%Zn *** solution and peak-aging,the highest strength and hardness were obtained on the alloy with 0.5 wt%Zn *** electron microscopy(TEM)characterizations revealed that there are denser and finer precipitates on basal(β’)and prismatic(γ’)planes,***,the excellent mechanical performance of the alloy with 0.5 wt%Zn addition is mainly due to precipitation strengthening and grain boundary strengthening.

关键词： Magnesium alloy Intermetallic phase Precipitates Mechanical property

Effect of Mg Addition on Inhibiting Austenite Grain Growth in Heat Affected Zones of Ti-Bearing Low Carbon Steels

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Journal of Iron and Steel Research International 2011年第9期18卷 60-64页

作者： ZHU kai yang jian WANG Rui-zhi yang Zhen-guo Department of Materials Science Fudan University Shanghai 200433 China Metallurgical ProcessDepartment Research and Development Center Baoshan Iron and Steel Co Ltd Shanghai 201900 China

To study the effect of Mg addition on inhibiting weld heat affected zones （HAZ） austenite grain growth of Ti-bearing low carbon steels, two steels with and without Mg treated were prepared using a laboratory vacuum. The welding testing was simulated by Gleeble 3500 thermomechanical simulator. The performance of HAZ was investiga ted that the toughness was improved from 3.3 to 185 J by adding 0. 005%Mg （in mass percent） to the steel, and the fracture mechanism changed from cleavage fracture to toughness fracture. Through in-situ observation by a confocal scanning laser microscope, a significant result was found that the austenite grain of the steel with Mg treated was still keeping fine-grained structure after holding at 1 400℃ and lasting for 300 s. This inhibition of austenite grain growth was mainly attributed to the formation of pinning particles after the addition of Mg. The obtained results pro pose a potential method for improving HAZ toughness of structure steels.

关键词： low carbon steel Mg microstructure pinning mechanism