Papers by Keyword: Height

Abstract: This study proposes the use of solar energy by thermal way, to heat water using a flat solar collector whose absorber is equipped with straight fins. The study concerns the optimization of the height of the fins and is based on the criterion of the absorbed energy with the necessary condition, the realization of the black body at the absorber. For this work, the relationship between the fins height, the fins pitch, the coordinates of the sun and the ones of the collector was established in order to determine, for each period of the day, the number of reflections. The absorbed energy during each of the two unfavorable days and for each given fin height was evaluated. The results show that the optimal height is equal to 5 mm all the days of the year considered. A height less than 5 mm will generate a very significant loss while a height superior to 5 mm generates an insignificant gain

Abstract: Seedling growth traits of 24 provenances of Larix principis-rupprechtii were analyzed to select superior provenances. Variance and correlation on height, basal diameter, root length, root and stem fresh weight of 1-year old and 2-year old seedlings of those provenances were analyzed. Then correlation coefficients between these growth traits and membership value of height and basal diameter of 24 provenances were carried on. Results showed that variance on growth traits of 1-year old seedlings among 24 provenances were only significant for height, but for basal diameter, height, root and stem fresh weight of 2-year old seedlings. Based on correlation coefficients between growth traits, height and basal diameter were selected for comprehensive evaluation. The top 5 provenances of Larix principis-rupprechtii were Neimeng Balinzuo, Hebei Weichang 1-21, 7-46, 8-75, and Beijing, according to average of membership value of height and basal diameter.

Abstract: Single man-sieving sand materials were tested in Constructed Rapid Infiltration System (CRI). We selected two different sand sizes as filling filter materials, with three different heights in 15cm, 30cm and 45cm respectively. The system was operated for totally 11 periods in 33 days under a hydraulic load of 1.5m/d and wetting-drying ratios of 1:5. Relevant data about COD, N and P in the effluent are then analyzed. Results show that Constructed Rapid Infiltration System can effectively remove the pollutants in municipal wastewater, thus reduce the adverse effects to local area, which can be feasible to apply as the secondary treatment in small towns. Test shows that under the selected hydraulic load and wetting-drying ratios, the optimal operation condition is the 45cm-high packed column, with the removal rate of 35~75% COD, 50~100% dissolved orthophosphate and 55~98% TP, which was far beyond the normal CRI removal rate of TP as low as 30%, to imply a innovation method for integrated waste water treatment system, especially for TP

Abstract: In many cases, the color information is useless. If we extract non-color characteristics of detection target without increasing complexity of the system,we can improve efficiency in the use of video.This paper presents a technique which must be realized based on the assumption that the body is perpendicular to the ground can measure human’s height by single camera. This technology has a strong practical in the field of Public Security Criminal Investigation

Abstract: Machine with a parallel jaw as a fixture of a widely used, it is an indispensable tool in the machining of the existing. But the actual processing according to the workpiece size, pad iron with different specifications in the clamping to adjust the height of the processed parts. The height adjustable machine with a parallel jaw improves caused problems and the use of existing in the actual processing is organic with parallel jaw of inconvenience, in order to solve this problem to design a highly available parallel jaw adjustable machine of the utility model patent, can improve the productivity and reliability, so that the operation all great satisfaction. height adjustable device of the machine with parallel jaw are discussed.

Abstract: In ordinary lathe turning workpiece before, must first adjust the turning tool nose aim at spindle centre. But in the real machining cutter bar itself due to different specifications, you need to add the shims in the cutter bar below to adjust the height to meet the lathe tool nose alignment chuck center. But this traditional method often turning tool itself reduced rigidity, affected by the roughness of the machined surface, in order to solve this problem, this paper will newly design to reasonable of turning tool holder, make the turning tool holder height according to the requirements of the upper and lower adjustment, solve the insufficient rigidity of turning tool, workpiece surface roughness difference, eating tool, tooth type angle is not accurate and other issues, the following discussion is made on the structure design. Context Development is important, on the basis of ensuring processing quality, improve productivity, existing equipment, is now as the industry is the rapid development of China's urgent need to solve the problem, in order to make a country really strong, must be developed industrial base, in the machining of this big family, Especially ordinary lathe, but a high quality processing lathe and process parameters is the total goal of development of manufacturing industry. As the machine tool operator is the first to consider how to improve the existing machine, the machine speed, reduce the processing time, reduce the auxiliary time, to improve production efficiency, and as the main auxiliary components-lathe tool holder, should also continue to improve and perfect its function. Although the lathe tool holder has emerged many improvements, but also part of the failure to meet, but these are temporary, so we must spend considerable to devote themselves to the improvement of equipment, this article tells about a scheme of ordinary lathe tool holder with improved.

Abstract: Studied on improved varieties and its parents growth characteristics. Discusses the Populus fine varieties Populus alba×Populus bolleana with its parents differences to promote varieties of Populus to provide a theoretical basis for Populus alba×Populus bolleana .The results showed:(1) Comparison of 3 varieties height accumulative increment consistent, individual difference were not significant. (2) 3 poplar varieties cumulative growth of DBH have difference, xinjiang Poplar DBH growth in the 2-8 years was slow , while the Populus alba Linn. and Populus alba×Populus bolleana continued to grow. 3 varieties DBH growth contrasts: Populus alba×Populus bolleana > Populus alba Linn.> Populus alba.(3) Populus is significantly lower than the volume growth Populus alba×Populus bolleana. Populus alba×Populus bolleana volume growth in 15 years and still maintain a high level of greater than Populus alba Linn.Populus alba Linn.and Populus alba.before the Populus alba×Populus bolleana arrivals the quantitative maturity .

Abstract: By analyzing problems of highway subgrade fill height in Xinjiang plain terrain, this paper subdivided plain terrain types and proposed corresponding height control measures of subgrade fill based on features of different subtypes, which provides useful reference to similar engineering in plain terrain.

Abstract: Spray distribution uniformity is a very important performance of nozzle. This paper analyses the spray uniformity of the spraying machinery as well as the influence factors. Spray distribution coefficient of variation of nozzles varies with the different spray pressure, spray pressure and spacing. The nozzles of lechler ST made in German were tested to present the optimum spray height with different spray pressure and spray spacing through analyzing the trend of coefficient of variation varying with the different spray pressure, spray height and spray spacing. By the test, the greatest impact on spray uniformity is the pressure of the spray bar, followed by the height and the spacing of the spray bar. By analysis of the spray distribution coefficient of variation, we find the optimum combination of the spray pressure, spray height and spray spacing.

Abstract: Aimed problem A of CUMCM in 2010,use geometry method to study height and volume relation in oil tank with changed position. Get function , which was proved to be correct and reliable with numerical method.