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Near-complete violation of detailed balance in thermal radiation
Near-complete violation detailed balance thermal radiation
2015/8/6
We introduce general principles for achieving maximal violation of detailed balance in thermal radiation. We validate these principles by direct numerical calculations, based on fluctuational el...
重水在摄氏25°至100°间之密度
2007/12/13
重水在50°以上,迄今尚无较为准确之测量。作者用一具16ml容量之水晶比重瓶,在25°至100℃间,测得重水之密度。茲引用25°以下已知之数值,制成一重水密度表,自其冰点迄沸点,每隔5度,列示其密度之数值。此等数值之准确度,约为十万分之五。
马氏体式相变过程中所引起的内耗变化
2007/12/12
用扭摆测量两种跌锰合金(Mn17.5％和12.8％)和一种铜铝合金(Al13％)的内耗,在发生正和反的马氏体相变的温度范围内各出现一个内耗峰。这种内耗峰出现的条件是必须伴随着马氏体式相变过程的进行。用含Mn17.5％的铁锰合金作了系统实验,观察到内耗峰的高度随升温(或降温)速度和应力的增加而增高,随振动频率和含碳量的增加而减低。可以用振动一周内试样中转变量愈多内耗也愈大的关系得到统一的解释。讨论了...
外类杂质在氧化亚铜中的扩散
2007/12/12
在640—960℃温度范围内研究了放射性铊和钽在结晶粒结构的氧化亚铜晶体中的扩散。结果指出,它们分别满足下列关系式:DTl=2.29×10-2e-37000/(RT)+7.73×10-9e-6100/(RT)厘米2/秒;DTa=8.95e-49500/(RT)+1.85×10-8e-7200/(RT)厘米2/秒。logD～1/T图线在760±10℃有一转折点,在这个温度以上和以下由曲线斜率求出的激...
Casimir energy of a dilute dielectric ball with uniform velocity of light at finite temperature
Casimir energy of a dilute dielectric ball uniform velocity of light finite temperature
2010/10/18
The Casimir energy, free energy and Casimir force are evaluated,at arbitrary finite temperature, for a dilute dielectric ball with uniform velocity of light inside the ball and in the surrounding medi...
Adiabatic Output Coupling of a Bose Gas at Finite Temperatures
Adiabatic Coupling Bose Gas Finite Temperatures
2010/10/15
We develop a general theory of adiabatic output coupling from trapped, weakly-interacting,
atomic Bose-Einstein Condensates at finite temperatures. For weak coupling, the output rate from the condens...