The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper the necessity of strengthening transportation of fruit and vegetable is discussed systematically. And combined to the characteristic of fruit and vegetable, and the situation of cold storage transportation, storage and transportation relevant technique requirement of fruit and vegetables is analysed, such as temperature, humidity, gas composition, package and vibration, and according...
Index structure system of urban rail transit is analyzed and optimized by applying information entropy. In this paper, a security evaluating C2R model on analyzing urban rail transit is set up based on DEA. Finally, a case study about Guangzhou Metro Line 1 is carried out, and annual relative validity of subway operation safety is evaluated by using the Matlab software program. According to the results...
We study the fractional Talbot effect of a grating and a lens under sphere lightwave illumination in this paper. Our analysis is based on the scalar theory of optical diffraction. For simplicity we omit the influence of the finite size of the grating and the lens on the optical diffraction. We use comparing method. We change the diffraction of the optical system under sphere lightwave illumination...
Due to the characteristics of cold chain logistics, this paper proposes a model of a multi-level-instrumented physical monitoring platform based on ZigBee and RFID technologies and Grid computing management system. Information about food products and their environments can be gathered and processed throughout the logistic chain in real time, thus the system model can facilitate more accurate monitoring...
The paper outlines the status of Variable Message Signs (VMS) on urban expressway in Beijing, and analyzes the reason for benefit generated by VMS. Firstly, the criterion system of VMS evaluation is built. Secondly, the means of data collection related to criterion system are ordered. Thirdly, the approach to VMS evaluation is determined as with or without method and cost-benefit analysis, which is...
The deflection reasons for long-span prestressed concrete box-girder (LPCB) bridge are still ambiguous. This paper pointed out some outstanding advantages of using fiber optical sensing (FOS) technology in old LPCB Bridge strengthening monitoring. According to certain existing old LPCB Bridge strengthening monitoring example,it presented some direct and indirect monitoring indexes that should be contained...
Due to the configuration complexity of the diesel locomotive air brake system, it is difficult to realize the fault diagnosis on the brake system. In order to enhance fault diagnosis efficiency for diesel locomotive air brake system with uncertain fault, a fault diagnosis model based on Bayesian network is proposed in this paper. According to a priori exact probability or experts estimate that the...
This paper presents a RFID tag antenna at 900MHz which has a wide frequency band, meeting that of Chinese standard from 860MHz to 960MHz, and it possesses easy conjugate impedance matching property by adopting an arc-shaped feeding. With a typical antenna impedance of Monza3 (Impinj), the proposed tag of compact size 30×70mm2 has a stable performance through 100MHz frequency bandwidth.
To maintain the stability of the vehicle and to guarantee the traction performance, an acceleration slip regulation (ASR) system is proposed for a front-axle drive electric passenger car. The control strategy of ASR based on the ASR system mentioned above is developed, which is realized in MATLAB/Stateflow. In order to study the characteristics of the ASR system better and to evaluate the performance...
The railway signaling system is a safety related system composed of several sub-systems which have to exchange information with each other. As the communication system may be subjected to intentional or unintentional external attacks, the application of specific safety techniques is necessary. In this paper, a safety protocol is designed. Compared with the general TCP/IP protocol, a safety layer,...
Firstly the necessity of the design of signal coordination control system in urban main roads is presented , and the design thinking and process of the signal coordination control system is given, then according to the design thinking and process create a model of signal coordination control system in urban main road., and Qingyang Road of LAN Zhou City is taken for example, based on the survey data...
The diversity of railway gauge is caused by historical reasons, and its shortcomings have been exposed to Modern railway transportation. At present, the solutions to Logistics and transport issues between different gauge railways are mainly to change transport equipment. And different ways to replace Bogie will affect the size of the frontier transshipping station, operating efficiency and investment...
The heterogeneous fleet vehicle routing problem with time windows is a variant of the classical vehicle routing problem. This paper defines a mathematical model of this problem and proposes a variable neighborhood tabu search algorithm to solve it. The initial solution is obtained by GENIUS and the giant tour algorithm. Our algorithm employs a variable neighborhood mechanism to search the optimal...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.