An important implication of this work is that the conversion of energy by matter falling toward a black hole is much more efficient than nuclear or fossil fuels 该工作的重要推论是，落向黑洞的物质比核燃料或化石燃料有着更高的能量转换效率。
Solid oxide fuel cells ( sofc ) is one of the most attractive energy conversion system because of its high efficiency , low pollution and fuel flexibility 固体氧化物燃料电池( sofc )因其具有能量转换效率高、低污染、对燃料的适应范围宽而备受关注。
The result shows that good approach rhythm and high center of mass are necessary to reach good records , and the economic value and time efficiency of takeoff emphasize the disadvantages of chinese athletes 结果表明：良好的助跑节奏与较高的起跳质心是获得优异成绩的必要条件；起跳的能量转换效率与时效性是国内运动员的弱势所在。
And it has a high absorption coefficient ( > 10 ~ 4cm ~ ( - 1 ) ) and a high conversion efficiency of ~ 25 % . in addition , elements sn and s are abundant and non - toxic in nature , which has good compatibility to environment . thus , it can be used as an absorbing layer material in the solar photovoltaic cells 其具有很大的光吸收系数( > 10 ~ 4cm ~ ( - 1 ) ) ,且在理论上其能量转换效率最高可达到25 % ,其组成元素在地球上储存含量丰富,有很好的环境兼容性,因而非常适合于作为太阳能电池中的光吸收层。
In the section of experiment , we focused on the research of optical system of optical parameter oscillation , computer controlling data sampling closed - circuit system and technology of computer controlling feed - back . in the section of optics , we used present condition to do the experiments about optical parameter effect and got a series of characteristic curve on power transition efficiency and output power 本文的实验部分主要侧重于智能化光参量系统的光学部分、计算机控制数据采集闭环系统以及计算机控制反馈技术的研究。在光学部分，本论文利用现有实验条件进行了参量振荡器频率调谐的研究，得到了调谐曲线，并做了输出参量光的能量转换效率以及输出功率的实验，得到一系列特性曲线。
Compared to gan , which is one of the most successful wide - band semiconductor materials at present , zno is promising : high - quality zno with very low defect densities can be synthesized at much lower temperature than gan ; zno can emits light with shorter wavelength than blue light emission from gan ; zno has higher excitonic binding energy ( ~ 60mev for zno , 25mev for gan ) , which promises strong photoluminescence from bound excitonic emissions at room temperature ; meanwhile , homogeneous bulk zno is available 和gan相比， zno薄膜具有生长温度低，激子复合能高( zno ： 60mev ， gan ： 21 25mev ) ，受激辐射阈值较低，能量转换效率很高等优点。有可能实现室温下较强的紫外受激发射，制备出性能较好的探测器、发光二极管和激光二极管等光电子器件。
A mixed - powered thermoacoustic prime mover concept is also presented in use of hysteresis , which may be helpful for the application of low - qualified energy to thermoacoustic machines . 3 ) traveling - wave thermoacoustic prime mover also known as thermoacoustic stirling engine , traveling - wave thermoacoustic prime mover is a newly proposed thermoacoustic system 这种机型中由于经历的是可逆斯特林循环，它的能量转换效率较驻波型有本质性的提高，已经可以同传统的发动机(如内燃机)相媲美。
Sns has an energy gap of eg 1 . 3ev , which is very close to the optimum energy gap 1 . 5ev of solar cells , and it has a high absorption coefficient ( > 104cm - 1 ) and a high conversion efficiency of about 25 % . in addition , elements sn and s are abundant and non - toxic in nature 硫化亚锡( sns )的禁带宽度eg 1 . 3ev ,接近太阳能电池的最佳禁带宽度1 . 5ev ,在理论上其能量转换效率达到25 % ;其吸收系数? 104cm - 1 ,用作太阳能电池耗材少;其组成元素s和sn在地球上储量丰富、廉价、无毒,有很好的环境兼容性。
Experimental results indicate that under two different work modules , i . e . real - time control and energy feedback , experimental prototype could achieve excellent static performance , dynamic characteristic and high power transformation efficiency , which consequently prove the correctness and feasibility of our solution 实验结果表明，实验样机在实时控制和能量回馈两种不同的工作模式下，均有良好稳态性能和动态特性，具有较高的能量转换效率，从而表明了本文解决方飞轮储能控制系统及能量回馈技术的研究案的正确性与可行性。
The most studies were focused on the influence of soz on photosynthetic organ e . g . chloroplast in vitro and fumigating with high concentrations of soz . thus , those experiments could not reflect the real state of plant suffering from soz pollution in nature condition and it was very difficult to find out the mechanism of soz affecting photosynthesis 我们采用与自然条件相近的野外开顶式熏气装置，用0 . 8571mg m ~ 3的低浓度so2长期处理油桐苗木，用近期发展起来的对植物无伤害作用的荧光测定技术和叶红外820nm吸收测定技术，对长期低浓度so2对光合能量转换效率及其机理进行了研究。
