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Search Results: 1 - 10 of 12752 matches for " WenYu Di "
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Air Compressor Control System for Energy Saving in Locomotive Service Plant  [PDF]
Wenyu Mo
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2009, DOI: 10.4236/jemaa.2009.12018
Abstract: The actuality and disadvantages of traditional high power asynchronism motor drive air compressor in locomotive ser-vice plant are discussed. In order to reduce the energy consumption and obtain safe running, a variable frequency con-trol method to the motor is supplied. A PLC with touch screen is used for monitoring the status of the compressor and its control system. It also presents energy consumption analysis caused by the variable frequency control method in a locomotive service plant.
Mathematical Model and Algorithm for the Task Allocation Problem of Robots in the Smart Warehouse  [PDF]
Zhenping Li, Wenyu Li
American Journal of Operations Research (AJOR) , 2015, DOI: 10.4236/ajor.2015.56038
Abstract:

In the smart warehousing system adopting cargo-to-person mode, all the items are stored in the movable shelves. There are some warehouse robots transporting the shelves to the working platforms for completing order picking or items replenishment tasks. When the number of robots is insufficient, the task allocation problem of robots is an important issue in designing the warehousing system. In this paper, the task allocation problem of insufficient warehouse robots (TAPIR) is investigated. Firstly, the TAPIR problem is decomposed into three sub-problems: task grouping problem, task scheduling problem and task balanced allocation problem. Then three sub-problems are respectively formulated into integer programming models, and the corresponding heuristic algorithms for solving three sub-problems are designed. Finally, the simulation and analysis are done on the real data of online bookstore. Simulation results show that the mathematical models and algorithms of this paper can provide a theoretical basis for solving the TAPIR problem.

A Comparative Study of Dark Matter in the MSSM and Its Singlet Extensions: A Mini Review
Wenyu Wang
Advances in High Energy Physics , 2012, DOI: 10.1155/2012/216941
Abstract: In this note we briefly review the recent studies of dark matter in the MSSM and its singlet extensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detection results of CDMS II, XENON, CoGeNT, and PAMELA, we find that (i) the latest detection results can exclude a large part of the parameter space which is allowed by current collider constraints in these models. The future SuperCDMS and XENON can cover most of the allowed parameter space; (ii) the singlet sector will decouple from the MSSM-like sector in the NMSSM; however, singlet sector makes the nMSSM quite different from the MSSM; (iii) the NMSSM can allow light dark matter at several GeV to exist. Light CP-even or CP-odd Higgs boson must be present so as to satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgs boson, the light neutralino dark matter can explain the CoGeNT and DAMA/LIBRA results; (iv) the general singlet extension of the MSSM gives a perfect explanation for both the relic density and the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in different scenario are also studied. 1. Introduction Although there are many theoretical or aesthetical arguments for the necessity of TeV-scale new physics, the most convincing evidence is from the (Wilkinson Microwave Anisotropy Probe) WMAP observation of the cosmic cold dark matter, which naturally indicates the existence of (weakly interacting massive particles) WIMPs beyond the prediction of the standard model (SM). By contrast, the neutrino oscillations may rather imply trivial new physics (plainly adding right-handed neutrinos to the SM) or new physics at some very high see-saw scale unaccessible to any foreseeable colliders. Therefore, the TeV-scale new physics to be unraveled at the large hadron collider (LHC) is the most likely related to the WIMP dark matter. If WIMP dark matter is chosen by nature, it will give a strong argument for low-energy supersymmetry (SUSY) with R parity which can give a good candidate. Nevertheless, SUSY is motivated for solving the hierarchy problem elegantly. It can also solve other puzzles of the SM, such as the deviation of the muon anomalous magnetic moment from the SM prediction. In the framework of SUSY, the most intensively studied model is the minimal supersymmetric standard model (MSSM) [1], which is the most economical realization of SUSY. However, this model suffers from the -problem. The -parameter is the only dimensional parameter in the SUSY conserving sector. From a top-down view, one would expect the
On the Differences between Chinese and Western Legal Ideas in the Process of Chinese Legal Modernization —Taking the Witness Affidavit as an Example  [PDF]
Wenyu Hu
Open Journal of Social Sciences (JSS) , 2019, DOI: 10.4236/jss.2019.76022
Abstract: The basic way of modernizing Chinese law is to transplant foreign laws. Introducing the Western legal system directly into China as an “imported product” and letting the Western legal system play a role in China’s legal system which is a process of localizing a foreign legal system into China. In this process, the collision of two different legal traditions between China and the West will inevitably lead to conflicts of many legal concepts and problems in the operation of the legal system. Among them, the introduction of the witness oath system is an example. This article takes the introduction of the witness oath system in the process of Chinese legal modernization as an entry point to deeply analyze the differences between Chinese and Western legal concepts in the process of legal system transplantation and even the entire legal modernization process. This concrete and realistic difference is ours. How should it be solved?
Risk factors of recurrence in small-sized, node negative breast cancer in young women: a retrospective study in Chinese population
XiaoSan Zhang,PengFei Li,WenJie Ma,WenYu Di,Shu Zhao,QingZu Gao,YuYing Zhao,MaoPeng Yang,QingYuan Zhang
Science China Life Sciences , 2013, DOI: 10.1007/s11427-013-4435-y
Abstract: We aimed to investigate risk factors of local and distant recurrence in small-sized, node negative breast cancer in women <35 years in a Chinese cohort. Between January 1994 and January 2007, 107 patients with pathologically confirmed small-sized ( 1 cm), node negative breast cancer who did not receive neoadjuvant or adjuvant chemotherapy were included. The 5-year recurrence-free survival (RFS) was estimated according to different prognostic variables. With a median time of 60 months (range, 8–60 months) follow-up, local and distant recurrence were observed in 25 cases (23.4%). By univariate analysis, HER-2 positivity, triple negative (TN), and high Ki-67 index ( 14%) were risk factors of a lower RFS (hazard ratio (HR) 6.680, 95% confidence interval (CI) 2.350–18.985, P<0.0001 for HER-2 positive; HR 4.769, 95%CI 1.559–14.591, P=0.006 for TN; HR 6.030, 95%CI 2.659–13.674, P<0.0001 for high Ki-67 index). Patients with grade 3 tumors had a lower RFS (HR 2.922, 95%CI 1.096–7.791, P=0.032) compared with those with grade 1 or grade 2 tumors. By multivariate analysis, HER-2 positivity (HR 10.204, 95%CI 3.391–30.704, P<0.0001), TN (HR 10.521, 95% CI 3.152–35.113, P<0.0001) and high Ki-67 index (HR 10.820, 95%CI 4.338–27.002, P<0.0001) remained risk factors of RFS. In this cohort, HER-2 positivity, triple negative and high Ki-67 index were independent risk factors of RFS in young patients with T1a,bN0 breast cancer. Subsequent pregnancy did not affect RFS.
Analysis of Characteristics of Road Traffic Accident Casualties in Guilin  [PDF]
Wenyu Qin, Xiang Liu, Zhibin Kong
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.66009
Abstract: Objectives: To explore the characteristics of road traffic accident casualties and time distribution characteristics of road traffic crashes in Guilin. Methods: We analyzed the data of road traffic crashes in 2007-2014 of Guilin to explore the casualty’s features of road traffic injuries and time distribution characteristics of road traffic crashes. Results: A total of 3162 road traffic accident casualties were studied. The majority of the study subjects were males (63.23%) who suffered almost twice as females. The casualties’ ages ranged from 5 to 78 years with the mean age 33.65 ± 16.76 years. The mortality rate of RTCs was significantly higher in males than in females (61.39 versus 38.61, P < 0.05). RTIs disproportionately affected adult people, with the majority of those fatalities occurred among people aged 15 - 59 years. The mortality rates of RTCs varied greatly by educational status, more than one-third occurred in people of secondary school. Approximately 40.25% of fatalities of road traffic crashes occurred in daily laborer showed that mortality rate was significantly higher than other occupations (P < 0.05). The distribution of season from road traffic deaths involved Spring (24.72%), Summer (15.56%), Autumn (30.56%), and Winter (29.17%). The proportion of road traffic deaths varied from the lowest 6.02% in 9:00 - 12:00 to the highest 16.78% in 0:00 - 3:0; midnight (0:00 - 3:00) shows a significantly higher proportion of reported road traffic deaths (P < 0.05). The upper limbs and lower limbs were the most common body region injured accounting for 16.57% and 17.84% of cases respectively; the highest fatality rate of head was 20.77% and followed by abdomen of 15.75%. Conclusions: This study showed diverse morbidity and mortality characteristics among the casualties and varied the road traffic accident rate and fatality rate from season and time. Corresponding measures to reduce the occurrence of traffic injuries should be formulated according to different population and time.
The Influencing Factors and Mechanism of Tourists’ Revisit Intention in Chinese Tourism Characteristic Towns—Take Gankeng Hakka Town in Shenzhen as an Example  [PDF]
Mu Zhang, Qing Chen, Wenyu Li
Journal of Service Science and Management (JSSM) , 2019, DOI: 10.4236/jssm.2019.123023
Abstract: Tourists’ revisit intention is of great significance to the sustainable development of Chinese tourism characteristic towns. This study took Gankeng Hakka Town which is a typical Chinese tourism characteristic town as an example, using confirmatory factor analysis (CFA) method of Structural Equation Modeling (SEM) to build a structural equation model regarding tourists’ revisit intention. This model included ten paths and four variables which were tourist satisfaction, tourist motivation, tourists’ perceived value and tourists’ revisit intention. Through CFA, this paper found out the dimensions of the three variables (tourist satisfaction, tourist motivation, tourists’ perceived value), also tested the reliability and validity of the measurement items. Through SEM, CMIN/DF, RMR, RMSEA, GFI, AGFI, NFI, RFI, IFI, TLI, CFI, PGFI, PCFI and PNFI were selected to evaluate the degree of finesse between the model and the data. The results indicate that the tourist satisfaction has a direct and significant effect on the tourists’ revisit intention; tourist motivation and tourists’ perceived value have no direct influence on tourists’ revisiting intention, but they can influence the revisiting intention through the influence of tourist satisfaction. Therefore, tourist satisfaction has a mediating effect in the mechanism of the entire model. Among them, the factors of “Increase Knowledge”, “Rich Atmosphere” and “Satisfactory Landscape” have great influence on tourists’ revisit intention. It is suggested that the construction of Chinese tourism characteristic towns should focus on the development of scenic cultural atmosphere and park landscape in the future.
Gate-tunable Topological Valley Transport in Bilayer Graphene
Mengqiao Sui,Guorui Chen,Liguo Ma,Wenyu Shan,Dai Tian,Kenji Watanabe,Takashi Taniguchi,Xiaofeng Jin,Wang Yao,Di Xiao,Yuanbo Zhang
Physics , 2015,
Abstract: Valley pseudospin, the quantum degree of freedom characterizing the degenerate valleys in energy bands, is a distinct feature of two-dimensional Dirac materials. Similar to spin, the valley pseudospin is spanned by a time reversal pair of states, though the two valley pseudospin states transform to each other under spatial inversion. The breaking of inversion symmetry induces various valley-contrasted physical properties; for instance, valley-dependent topological transport is of both scientific and technological interests. Bilayer graphene (BLG) is a unique system whose intrinsic inversion symmetry can be controllably broken by a perpendicular electric field, offering a rare possibility for continuously tunable valley-topological transport. Here, we used a perpendicular gate electric field to break the inversion symmetry in BLG, and a giant nonlocal response was observed as a result of the topological transport of the valley pseudospin. We further showed that the valley transport is fully tunable by external gates, and that the nonlocal signal persists up to room temperature and over long distances. These observations challenge contemporary understanding of topological transport in a gapped system, and the robust topological transport may lead to future valleytronic applications.
Effectiveness Study of English Learning in Blended Learning Environment
Wenyu Liu,Hanjing Yu
Theory and Practice in Language Studies , 2012, DOI: 10.4304/tpls.2.3.524-530
Abstract: The wide application of information technology makes web-based instruction pervasive in all levels of China’s educational institutions. The study aims to explore the inner relationship between learning motivations and learning strategies in the blended EFL learning environments based on a review on former studies about learning motivations, learning strategies and self-regulated learning. Altogether 540 pieces of questionnaire were distributed to non-English majored students in Dalian University of Technology who learnt English in a blended environment. Using the software SPSS, the data were thoroughly analyzed, indicating that students who display more adaptive self-regulatory strategies demonstrate better learning efficacy and higher motivation for learning and students’ performance is predictable with the help of learning motivation and strategies.
A Corpus-based Analysis of English Suffix –esque
Wenyu Liu,Haibo Shen
Theory and Practice in Language Studies , 2012, DOI: 10.4304/tpls.2.4.767-772
Abstract: Affixation is one of the most common and productive ways to form new words in English and forming words through suffix, an affix that is placed after a base, and is a significant component of affixation. Although numerous studies on common suffixes have been conducted, relatively little attention has been paid to the seemingly less used affixes, say the suffix –esque. A thorough analysis is conducted of the properties of the suffix –esque, specifically the etymology, the semantic meaning, the formation rules, the orthographic properties, the productivity and the stylistic tendency with the help of the Corpus of Contemporary American English (COCA). The findings are helpful in English teaching or learning.
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