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A novel flower-like BiVO4 and BiVO4/Bi2Ti2O7 heterojunction photocatalyst was firstly synthesized by surfactant-free hydrothermal route, which is very convenient, rapid, controllable and environmentally friendly. The crystal structures, chemical composition, morphology, optical and photo-catalytic property of the as-prepared samples were characterized by the techniques of XRD, XPS, SEM, HRTEM, BET,...
According to EN1434 (European Standard) and OIML R-75(International Organization of Legal Metrology), there are two methods in heat measurement, and they are all steady-state methods of test, using them in transient, obvious error will be produced, so some accurately measuring functions should be seeking. In a previous published paper of the author, a transient function relationship of heat quantity...
Mountain roads sections are recognized to be crash black-spots due to their complicated road geometric and geological conditions. Traffic crash on these road sections are severe and with great difficulties to be rescued. The paper mainly conducted the in-depth crash characteristic analysis based on typical mountain road traffic accidents in China. The research is of great importance to improve traffic...
Rural roads which are main parts of the national highway network contribute a lot to the prosperous of social and economics of rural area. With the gradual perfection of highway network, the mileage of national highway grows rapidly. It's of great importance to study and analyze the current safety situation of rural roads, especially those in mountainous areas where the traffic safety problem is increasingly...
When Venturi meters are used in wet gas the measured differential pressure is higher than it would be were the gas phases flowing alone. This phenomenon is called over reading, This paper proposed a new Venturi wet gas correlation based on homogenous and separated assumption, and its validity is verified through experiment. a new test program has been implemented in Tianjin University's low pressure...
Nowadays, air quality has being worse more and more, air pollution members of automatic monitoring has gained more attention sulfur dioxide is one of the main pollutants in air, it is an important indicator of atmospheric pollution levels. this paper studies the sample gas temperature and flow rate on impact of sulfur dioxide air quality monitoring system, two sulfur dioxide air quality monitoring...
Wet gas is a particular form of gas liquid two phase flow, normally; it can not be seen as single phase flow. when a single phase flow meter used in wet gas, appreciable errors will be produced, even, a measurement dispute would be generated, so it is extremely urgent to develop a online wet gas flow meter to measurement the gas volume fraction accurately. This paper present a review of Vortex wet...
The metro network in China's metropolitan areas has taken shape. In view of this, it is important to understand the traffic pattern for improvement of the operation, organization, and management practice. Station-to-station OD matrix, a basic and core element for calculating and gathering statistics of other traffic indicators, is fundamental to the overall analysis of metro network operation. Current...
The major factors affecting the passenger flow assignment in the urban rail transit network are analyzed and a generalized fare function is built in this paper. A logit-based model is built to simulate passenger flow route assignment after a whole rail network station-to-station OD matrix is estimated from IC card data. A case study is conducted based on the real survey data. The result demonstrates...
Heat measurement is very important to heat supply system, it concerned with the economic interest of suppliers and demanders, also, it is a key link of system monitoring, controlling and dispatching. The accuracy of heat measurement directly related to making the best use of heat energy. In this paper, the heating measurement method was analyzed according to European Standard 1434 1997, 2007 and International...
In heating measuring system, the water supply temperature of the heat source is requested invariable, it adopts the mode of changeable flow adjustment to change the capacity of heat supply, but in the actual operation it relates to the maintenance of the system and the sewage discharge, especially to the heating system of the boiler room. Furthermore, the heating measurement system unsurely employed...
In China, the heating measurement system employed a ball valve to control the flow rate on the pipe inlet of the house. Unsurely, the valve remain turn on when the inhabitant at home and remain cut off when the inhabitant go to work, which can make a step change to water supply temperature. In this paper, the characteristic of the temperature distribution curve of radiator was analyzed in transient,...
According to EN1434 (European Standard) and OIML R-75(International Organization of Legal Metrology), there are two methods in heat measurement, and they are all steady-state methods of test. The performances of these two methods are analyzed. A conclusion is improved that the two methods used in variable flow heating system results in appreciable errors. So some accurately measuring models should...
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