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Methods for determining unimpeded aircraft taxiing time and evaluating airport taxiing performance

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Chinese Journal of Aeronautics 2017年第2期30卷 523-537页

作者： yu Zhang qing Wang Civil and Environmental Engineering University of South Florida College of Air Traffic Management Civil Aviation University of China College of Transportation Engineer Tongji University

The objective of this study is to improve the methods of determining unimpeded（nominal） taxiing time,which is the reference time used for estimating taxiing delay,a widely accepted performance indicator of airport surface *** reviewing existing methods used widely by different air navigation service providers（ANSP）,new methods relying on computer software and statistical tools,and econometrics regression models are *** models are highly recommended because they require less detailed data and can serve the needs of general performance analysis of airport surface *** proposed econometrics model outperforms existing ones by introducing more explanatory variables,especially taking aircraft passing and over-passing into the considering of queue length calculation and including runway configuration,ground delay program,and weather *** length of the aircraft queue in the taxiway system and the interaction between queues are major contributors to long taxi-out *** proposed method provides a consistent and more accurate method of calculating taxiing delay and it can be used for ATM-related performance analysis and international comparison.

关键词： Aircraft taxiing Airport performance Econometric regression modeling Queue length Simulation analysis Taxiway system

Acetyl-11-keto-β-boswellic acid extracted from Boswellia serrata promotes Schwann cell proliferation and sciatic nerve function recovery

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Neural Regeneration Research 2018年第3期13卷 484-491页

作者： xiao-wen jiang bin-qing zhang lu qiao lin liu xue-wei wang wen-hui yu Department of Veterinary Medicine Northeast Agricultural University Harbin Helongjiang Province China

Frankincense can promote blood circulation. Acetyl-11-keto-β-boswellic acid （AKBA） is a small molecule with anti-inflammatory properties that is derived from Boswellia serrata. Here, we hypothesized that it may promote regeneration of injured sciatic nerve. To address this hypothesis, we established a rat model of sciatic nerve injury using a nerve clamping method. Rats were administered AKBA once every 2 days at doses of 1.5, 3, and 6 mg/kg by intraperitoneal injection for 30 days from the 1st day after injury. Sciatic nerve function was evaluated using the sciatic functional index. Degree of muscle atrophy was measured using the triceps surae muscle Cuadros *** changes were observed by hematoxylin-eosin staining. Western blot analysis was used to detect expression of phospho-extracellular signal-regulated kinase 1 and 2 （p-ERK1/2） in injured nerve. S100 immunoreactivity in injured nerve was detected by immunohistochemistry. In vivo experiments showed that 3 and 6 mg/kg AKBA significantly increased sciatic nerve index, Cuadros index of triceps muscle, p-ERK1/2 expression, and S100 immunoreactivity in injured sciatic nerve of sciatic nerve injury model rats. Furthermore,for in vitro experiments, Schwann cells were treated with AKBA at 0–20 μg/mL. Proliferation of Schwann cells was detected by Cell Counting Kit-8 colorimetry assay. The results showed that 2 μg/mL AKBA is the optimal therapeutic concentration. In addition, ERK phosphorylation levels increased following 2 μg/mL AKBA treatment. In the presence of the ERK1/2 inhibitor, PD98059 （2.5 μL/mL）, the AKBA-induced increase in p-ERK1/2 protein expression was partially abrogated. In conclusion, our study shows that AKBA promotes peripheral nerve regeneration with ERK protein phosphorylation playing a key role in this process.

关键词： nerve regeneration acetyl-11-keto-β-boswellic acid peripheral nerve injury repair sciatic nerve crush injury Schwann cells cell proliferation ERK signaling pathway PD98059 neural regeneration

A New xanthene from Blumea riparia

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Chinese Chemical Letters 2007年第3期18卷 303-305页

作者： Jia qing Cao Yao Yao Huan Chen Li qiao yu Zhi Zhou yue Hu Pei School of Traditional Chinese Materia Medica Shenyang Pharmaceutical University Shenyang 110016 China

A new xanthene, named blumeaxanthene, was isolated from Blumea riparia DC. The structure was elucidated on the basis of the data of NMR, MS, IR.

关键词： Blumea riparia DC. Compositae Blumeaxanthene

Effect of celecoxib on improving depression:A systematic review and meta-analysis

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World Journal of Clinical Cases 2022年第22期10卷 7872-7882页

作者： Zhi Wang qiao Wu qing Wang Integrated Traditional Chinese Medicine&Western Medicine Department Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina Department of Neurology Tongji HospitalHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina Department of Rehabilitation Center of Wuhan Puren Hospital Wuhan University of Science and TechnologyWuhan 430080Hubei ProvinceChina

BACKGROUND Anti-inflammation drugs were uncovered to be a potential therapy for *** as a selective COX2 inhibitor is also one anti-inflammation *** is widely used in the clinic,which is well known by medical *** is uncertain whether celecoxib has efficacy in improving *** To estimate the effect of celecoxib on improving *** All literature was searched until *** databases included PubMed,OVID database,Cochrane library,Web of Science,CNKI,*** database and Wanfang *** random effects model was used to estimate the standardized mean differences with 95%*** determined diagnostic criteria,studies containing patients with depression in the celecoxib group and the control group were included in the *** primary outcome measures were set for depression scale *** Twenty-nine randomized controlled studies were included in the meta-analysis(including 847 subjects with depression and 810 control subjects).The metaanalysis showed that celecoxib had an effect of *** the same time,heterogeneity was observed(I2=82.1%,P=0.00),and meta-regression was implemented to estimate the source of heterogeneity,which showed that the type of depression scale and depression type may lead to the *** analysis with respect to depression scale and depression type suggested that depression type was the possible main source of ***,Egger’s test,Begg’s test,funnel plot and Doi plot was implemented,and publication bias was found to be ***,the trim and fill method was used to estimate the influence of publication bias on the outcome of the meta-analysis,which showed that the outcome of the meta-analysis was *** analysis was estimated by deleting a study one by one,and the outcome of the meta-analysis was significantly *** quality of all randomized controlled trial studies was assessed by risk of bias,

关键词： Celecoxib Depression Systematic review Meta-analysis Inflammation

An efficient and coordinated mapping algorithm in virtualized SDN networks

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Frontiers of Information Technology & Electronic Engineering 2016年第7期17卷 701-716页

作者： Shui-qing GONG Jing CHEN qiao-yan KANG qing-wei MENG qing-chao ZHU Si-yi ZHAO College of Information and Navigation Air Force Engineering University

Software-defined networking(SDN) enables the network virtualization through SDN hypervisors to share the underlying physical SDN network among multiple logically isolated virtual SDN networks(v SDNs),each with its own *** v SDN embedding,which refers to mapping a number of v SDNs to the same substrate SDN network,is a key problem in the SDN virtualization ***,due to the distinctions of the SDN,such as the logically centralized controller and different virtualization technologies,most of the existing embedding algorithms cannot be applied directly to SDN *** this paper,we consider controller placement and virtual network embedding as a joint vS DN embedding problem,and formulate it into an integer linear programming with objectives of minimizing the embedding cost and the controller-to-switch delay for each v ***,we propose a novel online vS DN embedding algorithm called CO-v SDNE,which consists of a node mapping stage and a link mapping *** the node mapping stage,CO-vS DNE maps the controller and the virtual nodes to the substrate nodes on the basis of the controller-to-switch delay and takes into account the subsequent link mapping at the same *** the link mapping stage,CO-v SDNE adopts the k-shortest path algorithm to map the virtual *** evaluation results with simulation and Mininet emulation show that the proposed CO-v SDNE not only significantly increases the long-term revenue to the cost ratio and acceptance ratio while guaranteeing low average and maximum controller-to-switch delay,but also achieves good v SDN performance in terms of end-to-end delay and throughput.

关键词： Software-defined networking(SDN) Network virtualization Controller placement Virtual network embedding Coordination

区域互联网深化、信息摩擦与进口增长——基于进口二元边际视角

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山西财经大学学报 2025年第1期47卷 72-85页

作者：庄金凤马野青王冠宇南京大学商学院

信息技术发展是驱动城市数字经济发展和高水平对外开放的基础。基于此，创新性地提出考虑信息摩擦作用的垄断竞争分析框架，并从进口二元边际视角实证检验区域互联网深化对进口增长的作用。研究发现，区域互联网深化能显著促进进口规模... 详细信息

信息技术发展是驱动城市数字经济发展和高水平对外开放的基础。基于此，创新性地提出考虑信息摩擦作用的垄断竞争分析框架，并从进口二元边际视角实证检验区域互联网深化对进口增长的作用。研究发现，区域互联网深化能显著促进进口规模扩张，增长来源于进口价格、进口数量与进口种类，主要影响机制为降低信息摩擦。异质性分析表明，低对外贸易开放城市互联网深化显著降低了进口产品数量。进一步讨论发现，区域互联网深化对进口“数量”增长及“质量”增长均有促进作用。

关键词：互联网深化进口广延边际进口集约边际信息摩擦进口产品质量可变加价垄断竞争市场进口贸易

Restudy on Dark Matter Time-Evolution in the Littlest Higgs Model with T-Parity

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Communications in Theoretical Physics 2008年第11期50卷 1211-1218页

作者： qiao qing-Peng TANG Jian LI Xue-Qian Department of Physics Nankai University Tianjin 300071 China

Following previous study, in the littlest Higgs model （LHM）, the heavy photon is supposed to be a possiL dark matter candidate and its relic abundance of the heavy photon is estimated in terms of the Boltzman- Lee-Weinba time-evolution equation. The effect of the T-parity violation is also considered. Our calculations show that when Higmass MH taken to be 300 GeV and do not considering T-parity violation, only two narrow ranges 133 〈 MAH 〈 135 Ge and 167 〈 MAH〈 169 GeV are tolerable with the current astrophysical observation and if 135 〈 MAH 〈 167 GeV there must at least exist another species of heavy particle contributing to the cold dark matter. As long as the T-pari; can be violated, the heavy photon can decay into regular standard model particles and would affect the dark matt abundance in the universe, we discuss the constraint on the T-parity violation parameter based on the present dat Direct detection prospects are also discussed in some detail.

关键词： little Higgs dark matter time evolution

Post-Processing Time-Aware Optimal Scheduling of Single Robotic Cluster Tools

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IEEE/CAA Journal of Automatica Sinica 2020年第2期7卷 597-605页

作者： qing Hua Zhu Yan qiao NaiQi Wu Yan Hou School of Computer Science and Technology Guangdong University of TechnologyGuangzhou 510006China Institute of Systems Engineering Macao University of Science and TechnologyTaipa 999078MacaoChina State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006China

Integrated circuit chips are produced on silicon *** cluster tools are widely used since they provide a reconfigurable and efficient environment for most wafer fabrication *** advances in new semiconductor materials bring about new functionality for integrated *** a wafer is processed in a processing chamber,the wafer should be removed from there as fast as possible to guarantee its high-quality integrated ***,maximization of the throughput of robotic cluster tools is *** work aims to perform post-processing time-aware scheduling for such tools subject to wafer residencytime *** do so,closed-form expression algorithms are derived to compute robot waiting time accurately upon the analysis of particular events of robot waiting for singlearm cluster *** are given to show the application and effectiveness of the proposed algorithms.

关键词： Cluster tool discrete event systems optimization robotic systems scheduling

Negative Charge Management to Make Fragile Bonds Less Fragile toward Electrons for Robust Organic Optoelectronic Materials

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CCS Chemistry 2022年第1期4卷 331-343页

作者： Rui Wang qing-yu Meng Yi-Lei Wang Juan qiao Key Lab of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084 Center for Flexible Electronics Technology Tsinghua UniversityBeijing 100084

The operational stability of organic(opto)electronic devices largely depends on the intrinsic stability of organic materials on *** organic light-emitting diode(OLED)materials,a key parameter of their intrinsic stability is the bond-dissociation energy of the most fragile bond(BDE_(f)).Although rarely involved,many OLED molecules have the lowest BDE_(f) in anionic states[BDE_(f)(−)∼1.6–2.5 eV],which could be a fatal short-slab for device ***,we separated BDE_(f)(−)from other parameters and confirmed the clear relationship between BDE_(f)(−),intrinsic material stability and device *** on thermodynamic principles,we developed a general and effective strategy to greatly improve BDE_(f)(−)by introducing a negative charge manager within the *** manager must combine an electron-withdrawing group(EWG)with a delocalizing structure,so that it can firmly confine the negative charge and hinder the charge redistribution toward fragile ***,the use of this manager can substantially promote BDE_(f)(−)by∼1 eV for various fragile bonds and outperform the effect reported from solely employing EWGs or delocalizing *** effect was verified in typical phosphine-oxide and carbazole derivatives and backed up by newly designed molecules with multiple fragile *** strategy provides a new way to transform vulnerable building blocks into robust organic(opto)electronic materials and devices.

关键词： organic anions bond-dissociation energy chemical degradation intrinsic stability organic light-emitting diodes