By small break vapor phase accident emission experiment of nuclear heating reactor with different power and different crack size, studies system's security and undulation phenomenon during the natural circulation break. 通过不同功率、不同破口尺寸核供热堆小破口汽相事故排放的实验,研究了自然循环中断过程中系统的安全性和循环流量的波动现象;
Information of paddy rice fields and their spatial distribution is the data source for land use and land cover changes, crop yield estimates, methane emission estimates, food security, and water resources management. 水稻种植及其分布信息是土地覆被变化、作物估产、甲烷排放、粮食安全和水资源管理分析的重要数据源。
Compares with drill emission hole, the use of cutting method to against coal and gas outburst prominent have characteristics of security, time and labour-saving, and easy to operate. 与排放钻孔相比,使用掏槽法防突具有省时、省力、容易操作以及安全性好等特点。
UWB possesses excellent characteristics: high spectrum utilization ratio, ambition performance of anti multi-path attenuation, very low emission power and good system security. 其具有频谱利用率高、抗多径衰落能力强、发送功率极小、系统安全性好等特点。
Developing low-carbon agriculture can not only reduce the emission of greenhouse gas, but it also can ensure food security. 发展低碳农业不仅仅可以降低温室气体排放,还能够提高粮食产量,保障粮食安全。
The results show that most of the products have good UV absorbent and fluorescence emission properties and better whitening performance as long as security to the cell in the low concentration. 结果表明:合成的目标化合物,大部分新合成产物紫外吸收性好、荧光发射积分强度高,具有较好的增白性能以及在低浓度条件下对细胞无毒性。
However, restricted by the issues such as the reserves of conventional energy and carbon emission, energy shortage gradually becomes obvious year by year. To solve energy security problem, many countries pay more and more attention to the development and application of new energy. 但受到常规能源拥有量以及常规能源使用中发生的碳排放等问题的制约,能源逐渐成为紧缺资源,为了破解能源安全难题,各国已经逐渐关注新能源的开发和应用。
In order to theoretically research on the structural integrity of solid propellant under the emission load, improve the reliability and security, it requires to study the rocket launch process under low-load. 为对固体推进剂在发射载荷作用下的结构完整性进行理论研究,以提高固体推进剂的可靠性、安全性,迫切需要对低过载条件下的火箭弹发射过程进行实验研究。
Utilization of the natural gas engine is beneficial in reducing exhaust emission, diversifying energy source and keeping national energy security. 推广使用天然气发动机有利于降低内燃机的排气污染,实现能源多元化确保国家能源安全。
Since 20th century, the speedy economic growth characterized by high investment, high consumption and high emission is restricted due to the resources shortage and the environment capacity. The ecological security of the entire humanity will be threatened because of the weakening ecological bearing capacity. 二十世纪以来,以高投入、高消耗、高排放为特征的经济快速增长受到资源短缺和环境容量的制约,人类生态安全也将因生态承载力下降而受到威胁。
Energy saving and emission reduction, which is the important way to ease the pressure of resource supply 、 environmental pollution 、 national security and so on, is also inevitable for the sake of our nation and strongly links to national rejuvenation and sustainable development. 节能减排是关系民族振兴与可持续发展的国家大计,是缓解资源供给、环境污染、国家安全等诸多压力的重要途径。