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Modified stochastic user-equilibrium assignment algorithm for urban rail transit under network operation

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Journal of Central South University 2013年第10期20卷 2897-2904页

作者：朱炜胡昊徐瑞华洪玲 Center of Transportation Research School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong University School of Transportation Engineering Tongji University

Based on the framework of method of successive averages(MSA), a modified stochastic user-equilibrium assignment algorithm was proposed, which can be used to calculate the passenger flow distribution of urban rail transit(URT) under network operation. In order to describe the congestion's impact to passengers' route choices, a generalized cost function with in-vehicle congestion was set up. Building on the k-th shortest path algorithm, a method for generating choice set with time constraint was embedded, considering the characteristics of network operation. A simple but efficient route choice model, which was derived from travel surveys for URT passengers in China, was introduced to perform the stochastic network loading at each iteration in the algorithm. Initial tests on the URT network in Shanghai City show that the methodology, with rational calculation time, promises to compute more precisely the passenger flow distribution of URT under network operation, compared with those practical algorithms used in today's China.

关键词： urban rail transit stochastic user equilibrium assignment algorithm method of successive averages network operation

Functional Analysis of Three Rice Chloroplast transit Peptides

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Rice science 2019年第1期26卷 11-20页

作者： HE Lei CHEN Guang ZHANG Sen QIU Zhennan HU Jiang ZENG Dali ZHANG Guangheng DONG Guojun GAO Zhenyu REN Deyong SHEN Lan GUO Longbiao QIAN Qian ZHU Li State Key Laboratory of Rice Biology China National Rice Research Institute

Chloroplast transit peptides(CTPs) can be used to transport non-chloroplastic proteins into the chloroplasts. Here, we studied the CTPs of three rice(Oryza sativa L.) chloroplast-localized proteins and found that their CTPs could be used to transport non-chloroplast-localized proteins into the chloroplasts. Fusion proteins lacking the CTP remained located in the cytoplasm. Furthermore, we constructed green fluorescent protein fusion vectors with the three CTPs and three non-chloroplast-localized proteins, Ghd10, MULTI-FLORET SPIKELET1(MFS1), and SHORTENED UPPERMOST INTERNODE 1(SUI1). After transforming these constructs into rice protoplasts, the fusion proteins all localized in the chloroplasts. Collectively, our results showed that these CTPs can transport non-chloroplast-localized proteins into the chloroplasts, and more importantly, these CTPs can be applied to engineer chloroplast metabolism.

关键词： rice chloroplast transit peptide translocated function subcellular location

Equilibrium model and algorithm of urban transit assignment based on augmented network

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Science China(Technological Sciences) 2009年第11期52卷 3158-3167页

作者： SI BingFeng ZHONG Ming SUN HuiJun GAO ZiYou Institute of System Science School of Traffic and TransportationBeijing Jiaotong UniversityBeijing 100044China Department of Civil Engineering University of New BrunswickFrederictonN.B.E3B 5A3Canada

The passenger flow assignment problem for the urban transit network is relatively complicated due to the complexity of the network structure and many factors influencing the passengers' route and line choices. In the past three decades, many models have been proposed to solve the passenger flow assignment problem. However, the common-line problem remains challenging in transit flow assignment. In this paper, the characteristics of the urban transit network is analysed and a new technique of augmented network is proposed to represent the urban transit system. The purpose is to eliminate the complex common-line problem when modeling transit passenger flow assignment. Through this augmentation technique, the urban transit system can be represented by an augmented network-it then behaves like a simple network and can be used as a generalized network for traffic assignment or network analysis. This paper presents a user equilibrium model for the urban transit assignment problem based on such a technique. A numerical example is also provided to illustrate the approach.

关键词： transit network flow assignment user equilibrium algorithm

A tentative study for the prediction of the CME related geomagnetic storm intensity and its transit time

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Science China(Technological Sciences) 2005年第6期48卷 648-668页

作者： ZHAO Xinhua1,2 & FENG Xueshang1,3 1. SIGMA Weather Group, Key Laboratory of Space Weather, Center for Space Science and Applied Re-search, Chinese Academy of Sciences, Beijing 100080, China 2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China 3. School of Geophysics and Geoinformation Systems, China University of Geosciences, Beijing 100083, China SIGMA Weather Group Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing China Graduate School of the Chinese Academy of Sciences Beijing China School of Geophysics and Geoinformation Systems China University of Geosciences Beijing China

Using 80 CME-ICME events during 1997.1―2002.9, based on the eruptive source locations of CMEs and solar magnetic field observation at the photosphere, a current sheet magnetic coordinate (CMC) system is established in order to study the propagation of CME and its geoeffectiveness. In context of this coordinate system, the effect of the eruptive source location and the form of heliospheric current sheet (HCS) at the eruptive time of CME on the geomagnetic storm intensity caused by CME and the CME’s transit time at the Earth is investigated in detail. Our preliminary conclusions are: 1) The geomagnetic disturbances caused by CMEs tend to have the so-called “same side-opposite side effect”, i.e. CMEs erupt from the same side of the HCS as the earth would be more likely to arrive at the earth and the geomagnetic disturbances associated with them tend to be of larger magnitude, while CMEs erupting from the opposite side would arrive at the earth with less probability and the corresponding geomagnetic disturbance magnitudes would be relatively weaker. 2) The angular separation between the earth and the HCS affect the corresponding disturbance intensity. That is, when our earth is located near the HCS, adverse space weather events occur most probably. 3) The erupting location of the CME and its nearby form of HCS will also affect its arrival time at the earth. According to these conclusions, in this context of CMC coordinate we arrive at new prediction method for estimating the geomagnetic storm intensity (Dstmin) caused by CMEs and their transit times. The application of the empirical model for 80 CME-ICME events shows that the relative error of Dst is within 30% for 59% events with Dstmin≤?50 nT, while the averaged absolute error of transit time is lower than 10 h for all events.

关键词： coronal mass ejections, current sheet magnetic coordinate system, geomagnetic storm intensity, transit time, prediction method.

Hangzhou:Brainy Urban transit

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China Report ASEAN 2022年第5期7卷 40-42页

作者： Yuan Yanan 不详

The feeling of being trapped in a car in an endless stream of non-moving traffic while“inhuman”traffic lights rigidly change color to a set rhythm is familiar to *** spend more time looking for parking than the trip to the destination would *** ambulances,traffic problems can mean lost lives.A traffic accident usually causes traffic on a city street to pile up long before the police can arrive at the scene.

关键词： transit traffic spend

Probiotic supplementation decreases intestinal transit time: Meta-analysis of randomized controlled trials

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World Journal of Gastroenterology 2013年第29期19卷 4718-4725页

作者： Larry E Miller Arthur C Ouwehand Miller Scientific Consulting Inc. Arden NC 28704 United States DuPont Nutrition and Health FIN-02460 Kantvik Finland

AIM: To determine the efficacy of probiotic supplementation on intestinal transit time (ITT) and to identify factors that influence these outcomes. METHODS: A systematic review of randomized controlled trials (RCTs) of probiotic supplementation that measured ITT in adults was conducted by searching MEDLINE and EMBASE using relevant combinations. Main search limits included RCTs of probiotic supplementation in healthy or constipated adults that measured ITT. Study quality was assessed using the Jadad scale. A random effects meta-analysis was performed with standardized mean difference (SMD) of ITT between probiotic and control groups as the primary outcome. Meta-regression and subgroup analyses were conducted to examine the impact of moderator variables on ITT SMD. RESULTS: A total of 11 clinical trials with 13 treatment effects representing 464 subjects were included in this analysis. Probiotic supplementation was associated with decreased ITT in relation to controls, with an SMD of 0.40 (95%CI: 0.20-0.59, P < 0.001). Constipation (r 2 = 39%, P = 0.01), higher mean age (r 2 = 27%, P = 0.03), and higher percentage of female subjects (r 2 = 23%, P < 0.05) were predictive of decreased ITT with probiotics in meta-regression. Subgroup analyses demonstrated statistically greater reductions in ITT with probiotics in subjects with vs without constipation and in older vs younger subjects [both SMD: 0.59 (95%CI: 0.39-0.79) vs 0.17 (95%CI: -0.08-0.42), P = 0.01]. Medium to large treatment effects were identified with Bifidobacterium Lactis (B. lactis ) HN019 (SMD: 0.72, 95%CI: 0.27-1.18, P < 0.01) and B. lactis DN-173 010 (SMD: 0.54, 95%CI: 0.15-0.94, P < 0.01) while other single strains and combination products yielded small treatment effects. CONCLUSION: Overall, short-term probiotic supplementation decreases ITT with consistently greater treatment effects identified in constipated or older adults and with certain probiotic strains.

关键词： Constipation Gastrointestinal Intestinal transit time Meta-analysis Probiotics

ABB Vows to Assist Global Shipping Zero Carbon transit via Deep Ploughing in China Market

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船舶经济贸易 2023年第12期 58-61页

作者： Wang Qian 不详

The golden propeller outlined a beautiful arc in the air,and the dark gray machine gave a metal glow...On December 5-8,at the 21st China International Maritime Exhibition site,an Azipod pod propeller standing AB in th... 详细信息

关键词： transit ABB Deep

Subtotal colonic bypass plus colostomy with antiperistaltic cecoproctostomy for the treatment of slow transit constipation in an aged population:A retrospective control study

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World Journal of Gastroenterology 2018年第23期24卷 2491-2500页

作者： Yang Yang Yong-Li Cao Wen-Hang Wang Yuan-Yao Zhang Nan Zhao Dong Wei Institute of Anal-Colorectal Surgery No.150 Central Hospital of PLA

AIM To compare the efficacy,improved quality of life,and prognosis in patients undergoing either subtotal colonic bypass with antiperistaltic cecoproctostomy(SCBAC) or subtotal colonic bypass plus colostomy with antiperistaltic cecoproctostomy(SCBCAC) for the treatment of slow transit *** Between October 2010 and October 2014,aged patients with slow transit constipation who were hospitalized and underwent laparoscopic surgery in our institute weredivided into two groups: the bypass group,15 patients underwent SCBAC,and the bypass plus colostomy group,14 patients underwent SCBCAC. The following preoperative and postoperative clinical data were collected: gender,age,body mass index,operative time,first flatus time,length of hospital stay,bowel movements(BMs),Wexner fecal incontinence scale,Wexner constipation scale(WCS),gastrointestinal quality of life index(GIQLI),numerical rating scale for pain intensity(NRS),abdominal bloating score(ABS),and ClavienDindo classification of surgical complications(CD) before surgery and at 3,6,12,and 24 mo after *** All patients successfully underwent laparoscopic surgery without open surgery conversion or surgeryrelated death. The operative time and blood loss were significantly less in the bypass group than in the bypass plus colostomy group(P = 0.007). No significant differences were observed in first flatus time,length of hospital stay,or complications with CD > 1 between the two groups. No patients had fecal incontinence after surgery. At 3,6,and 12 mo after surgery,the number of BMs was significantly less in the bypass plus colostomy group than in the bypass group. The parameters at 3,6,12,and 24 mo after surgery in both groups significantly improved compared with the preoperative conditions(P < 0.05),except NRS at 3,6 mo after surgery in both groups,ABS at 12,24 mo after surgery and NRS at 12,24 mo after surgery in the bypass group. WCS,GIQLI,NRS,and ABS significantly improved in the bypass plus col

关键词： Subtotal colonic bypass plus colostomy with antiperistaltic cecoproctostomy Subtotal colonic bypass with antiperistaltic cecoproctostomy Minimally invasive surgery for treatment of constipation Clinical efficacy Slow transit constipation in an aged population

Determining transit nodes for potential transit-oriented development:Along the LRT corridor in Addis Ababa,Ethiopia

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Frontiers of Architectural Research 2020年第3期9卷 606-622页

作者： Eden Atsbeha Teklemariam Zhongwei Shen School of Architecture and Designf Southwest Jiootons Univeristy ChengduChina

The aim of transit-oriented development(TOD)is to create a livable urban environment by improving the integration between land-use and transportation *** capital city of Ethiopia,Addis Ababa,aims to promote a sustainable transportation system by launching its first light rail transit(LRT)network to control the current pattern of increased congestion and the need for mass *** for TOD around existing transit stations helps achieve improved transit choice and encourages local economic ***,this article proposes a methodology to quantitatively measure the existing TOD in terms of a TOD index within the walkable distance of transit nodes by measuring the criteria that define TOD *** TOD index is calculated for areas of 22 stations on the East-West LRT line of Addis *** on the value of the TOD index,certain stations are identified to have a potential TOD but poor transit *** these results,the recommendation to improve TOD planning can become accurate for each station,depending on its relevant *** results also help identify each station’s potential for TOD planning and its improvements toward future local developments.

关键词： Accessibility LRT transit TOD TOD index Addis Ababa