After six years of Himrod grape regional trial, the Himrod had very early- ripening precocity, stable flower bud differentiation, good fruit quality and great resis- tance to diseases, which could be a moderate develo...After six years of Himrod grape regional trial, the Himrod had very early- ripening precocity, stable flower bud differentiation, good fruit quality and great resis- tance to diseases, which could be a moderate development grape variety in Tianjin. The introduction performance cultivation techniques of Himrod grape were summa- rized.展开更多
The harm caused by bird swallowing itself mainly depends on the degree of engine damage after bird swallowing. Accurate and reliable results can be obtained through the whole machine experimental research, but the cos...The harm caused by bird swallowing itself mainly depends on the degree of engine damage after bird swallowing. Accurate and reliable results can be obtained through the whole machine experimental research, but the cost is relatively expensive. Therefore, the research work on bird swallowing mechanism, numerical simulation and analog evaluation is extremely necessary. In this paper, combined with the development requirements of a turbofan engine, the influence of bird swallowing on the performance of the whole machine is studied. Firstly, the strength simulation is carried out based on the bird swallowing condition, and the damage results of the engine after bird swallowing are obtained. Then, based on the calculated damage results, a concept and method of "equivalent damage" and "characteristic influence coefficient" are proposed, and the component characteristics are reconstructed based on the above concept and method. Then, the performance of the whole machine is simulated by using the reconstructed component characteristics, and the performance change results of the engine after bird swallowing are obtained. Finally, the evaluation results are verified by the bird swallowing test of the whole machine, trying to provide some experience reference for domestic research on the impact of bird swallowing on the performance of the whole machine.展开更多
Since the 1990’s, hydrogen has found broad use in the traffic segment. Compared with conventional ones, hydrogen fuelled vehicles, a new generation of clean vehicles, produce no pollutants, with higher energy efficie...Since the 1990’s, hydrogen has found broad use in the traffic segment. Compared with conventional ones, hydrogen fuelled vehicles, a new generation of clean vehicles, produce no pollutants, with higher energy efficiency. In today’s world where the pollution is tougher, the "Zero Pollution" fuel cell buses display展开更多
基金Supported by Key Program of Applied Basic and Frontier Technology Research Foundation of Tianjin(14JCZDJC34400)Special Fund for Modern Agricultural Technology System(CARS-30)Transformation and Extension Of Agricultural Science and Technology Achievements in Tianjin(201304120)~~
文摘After six years of Himrod grape regional trial, the Himrod had very early- ripening precocity, stable flower bud differentiation, good fruit quality and great resis- tance to diseases, which could be a moderate development grape variety in Tianjin. The introduction performance cultivation techniques of Himrod grape were summa- rized.
文摘The harm caused by bird swallowing itself mainly depends on the degree of engine damage after bird swallowing. Accurate and reliable results can be obtained through the whole machine experimental research, but the cost is relatively expensive. Therefore, the research work on bird swallowing mechanism, numerical simulation and analog evaluation is extremely necessary. In this paper, combined with the development requirements of a turbofan engine, the influence of bird swallowing on the performance of the whole machine is studied. Firstly, the strength simulation is carried out based on the bird swallowing condition, and the damage results of the engine after bird swallowing are obtained. Then, based on the calculated damage results, a concept and method of "equivalent damage" and "characteristic influence coefficient" are proposed, and the component characteristics are reconstructed based on the above concept and method. Then, the performance of the whole machine is simulated by using the reconstructed component characteristics, and the performance change results of the engine after bird swallowing are obtained. Finally, the evaluation results are verified by the bird swallowing test of the whole machine, trying to provide some experience reference for domestic research on the impact of bird swallowing on the performance of the whole machine.
文摘Since the 1990’s, hydrogen has found broad use in the traffic segment. Compared with conventional ones, hydrogen fuelled vehicles, a new generation of clean vehicles, produce no pollutants, with higher energy efficiency. In today’s world where the pollution is tougher, the "Zero Pollution" fuel cell buses display
