热辐射对热团簇衰变率和丰度的影响

本文量化了辐射冷却对单分子衰变速率、热簇以及非特定激发能量的分子的影响.检测出两种不同的区域,可以通过发射光子的能量大小进行定义,并根据光子发射速率常数和颗粒的热性质确定它们之间的边界.此外,通过丰度光谱计算了相当于小光子能量的连续冷却情况.两种不同区域分别是连续性冷却和单分子衰变的单光子猝灭.辐射效应通过重新定义每个单独的团簇用于进行蒸发的时间进行参数化,可用有效辐射时间常数来表示.     

Mechanical and Thermal Properties of the AH of FRW Universe

We calculate the work made out by the apparent horizon （AH） of the Friedmann-Robertson-Walker （FRW） universe and the heat flux through the AH from the first law of thermodynamics. We discuss the mechanical properties of the AH and analyze the universe model for which the mechanical properties can change. Finally, the thermal properties of the AH of FRW universe are discussed.     

The Influence of Thermal Treatment and Solar Radiation on the Optical Characteristics of Zinc Oxide Nanostructures

Optics and Spectroscopy - The luminescence properties of ZnO nanorods and nanocrystals after high-temperature annealing in air and exposure to strong solar radiation were studied. Under UV...     

辐射背景对岩石受力热红外光谱变化影响的实验研究

研究表明,岩石在加载过程中表面的红外辐射随应力发展而变化,而辐射信息的有效提取与辐射背景存在密切关系。通过理论分析不同实验环境对岩石受力热红外光谱变化影响,开展了花岗岩在室内外环境下的受力热红外光谱观测实验,分析了不同辐射背景下岩石红外辐射与应力的相关性以及由应力引发的辐射变化信息的强弱差异,并对两种环境下岩石应力热红外探测的优势波段进行了对比分析。结果表明,辐射背景对岩石受力热红外光谱探测结果有重要影响,室外环境因背景辐射较弱,相同应力作用下的红外辐射变化更加显著,与应力之间的相关程度更高,优势波段区间更宽,更加有利于岩石应力的热红外探测。8.0~11.8 μm波段是利用热红外遥感监测地表花岗岩应力变化的优势波段。     

Lemaitre-Tolman-Bondi Model of the Universe and Hawking Radiation of a Dynamical Horizon

The paper deals with anisotropic spherically symmetric Lemaitre-Tolman-Bondi model of the universe bounded by the apparent horizon. Using Hamilton-Jacobi method for both massive and massless test particles, we are able to show that the temperature associated with the apparent horizon due to Hawking radiation is the usual Hawking Temperature. Also the usual Lemaitre-Tolman-Bondi model and the transformed r-gauge Lemaitre-Tolman-Bondi model are shown to be equivalent. Finally, the results of Tunneling approach agree with the Hamiltonian-Jacobi method.     

Dilaton Black Hole Tunneling Radiation in de Sitter Universe

The Hawking radiation via tunneling from the dilaton black hole in de Sitter universe is investigated using Parikh Wilczek＇s method. We show that if the self-gravitational interaction and energy conservation are taken into account, the modified radiation spectrum deviates from exact thermal spectrum and satisfies the unitary theory.     

Quantum Corrections to Hawking Radiation for Rainbow Universe

Via the method beyond semi-classical approximation, we obtain the correctional tunneling probability and Hawking temperature at the apparent horizon of Finsler rainbow universe. Then we apply Bekenstein–Hawking entropy area law used in black hole to the cases of rainbow universe, and reach the entropy of the apparent horizon. Finally, we calculate the correctional entropy and obtain reasonable results.     

冰的热辐射偏振特性研究

冰作为全球能量平衡、气候、水文和生态模型中的重要参数,直接影响到地气系统能量平衡、天气和气候变化等,利用热红外波段对冰偏振特性研究国内外尚未见报道,运用热红外技术对冰热辐射偏振研究有重要意义。研究结果表明,波段、探测角、偏振角对冰热辐射偏振特性均有较大影响,而方位角影响不显著。振辐亮度表现为:LCH1LCH3LCH4LCH2,偏振亮温表现为TCH4TCH1TCH2TCH3,对冰热辐射偏振特性研究选择第三通道偏振亮温数据更优。探测角对冰热辐射特性影响极其显著且受偏振角影响,冰在探测角10°、偏振角30°处偏振亮温最低,这非偶然因素造成,与冰自身特性有关,探测角对冰偏振度影响表现为P0P40P10P20P50P30,偏振度大小与各偏振角的亮温差异大小直接相关,方位角对冰偏振亮温影响不显著,表面粗糙程度与组织结构差异直接导致冰在不同方位角发射辐射差异,利用偏振度对冰理化特性监测具有重要作用。     

Thermal Radiation of Graphene

Optics and Spectroscopy - The problem of thermal radiation of ideal graphene is considered based on the theoretical concepts of surface electromagnetic waves and surface impedance. The intensity of...     

雪的热辐射偏振特性定量研究

雪作为衡量全球气候变化有效的信息源之一,其热辐射存在偏振特性,且这一偏振特性会受到多因素的影响。为了定量分析单一因素及其交互作用对雪的热辐射偏振特性的影响,在传统分析的基础上,设计了三因素三水平的正交实验。结果表明,探测角、方位角和波段均对雪的热辐射偏振特性产生影响;探测角对雪的热辐射偏振度产生显著的影响;探测角与其他两因素的交互作用以及波段均对雪的热辐射偏振度产生显著影响;方位角对雪的热辐射偏振度有一定的影响,而它与波段的交互作用不会对雪的热辐射偏振度产生影响。因此,在研究中,既要考虑单因素本身对雪的热辐射偏振特性的影响,还要考虑交互作用的影响。     

The Radiation Spectrum of a Classical Electron Moving in a Radiation-Dominated Universe

The motion and radiation of a classical electron in a conformally flat Robertson–Walker space, which corresponds to the quasi-Euclidean model of a radiation-dominated universe, is considered. The spectral-angular distribution of the energy radiated by the electron is found; the dependence of the spectrum on the momentum of the electron is investigated; estimates for the coherence interval are given. The results obtained show that the radiation spectrum of a classical electron coincides with the quasiclassical limit of the spectral distribution of the photons radiated by a Dirac electron moving in a radiation-dominated universe.     

De Broglie–Bohm Interpretation of Canonical Quantum Cosmology Implies Early Stages of the Universe Dominated by Radiation

The Einstein＇s genera/relativity is formulated in the Hamiltonian form for a spatia/ly Bat, isotropic and homogeneous universe. Subsequently, we perform the canonical quantization procedure to the Hamiltonian to obtain the Wheeler-DeWitt equation. Solving the Wheeler-DeWitt equation and employing the de Broglie-Bohm interpretation to the wave function of the universe, we obtain a new version of spatia/ly fiat Friedmann equation for the early universe where the scale factor of the universe is taken to be sufilcientlv small.     

De Broglie-Bohm Interpretation of Canonical Quantum Cosmology Implies Early Stages of the Universe Dominated by Radiation

The Einstein's general relativity is formulated in the Hamiltonian form for a spatially flat, isotropic and homogeneous universe. Subsequently, we perform the canonical quantization procedure to the Hamiltonian to obtain the Wheeler-DeWitt equation. Solving the Wheeler-DeWitt equation and employing the de Broglie-Bohm interpretation to the wave function of the universe, we obtain a new version of spatially flat Friedmann equation for the early universe where the scale factor of the universe is taken to be sufficiently small.     

影响土壤偏振亮度温度的因子分析

土壤作为自然界的重要组成部分之一,对生态系统的形成和人类的生存均起着绝对不可忽视的作用,故对于土壤热红外偏振辐射特性的研究,具有十分重要的现实意义。而且,关于土壤在2π空间内的偏振热辐射特性的研究,国内外还未见报道。研究结果表明： 随着探测角的改变,土壤的偏振亮度温度在0°～80°范围内呈现非线性变化,当探测角的变化范围为60°～80°时,其偏振亮度温度随着探测角的增大而呈现明显的上升趋势;不同方位角条件下,土壤的偏振亮度温度会发生改变,在0°～240°范围内,随着方位角的增大而呈现上升趋势,在240°～320°范围内,呈现下降趋势;波段和偏振角对于土壤的偏振亮度温度的变化均具有一定的影响,而且二者的变化曲线的波动幅度都较为平缓;不同土壤类型的偏振辐射亮度温度不同,呈现草甸黑土>淋溶黑钙土>典型黑钙土>草甸风沙土的规律。以上研究为热红外偏振遥感基础理论研究提供重要依据。     

第三类热边界条件对激光晶体热效应的影响

以各向异性半解析热分析理论为基础,研究矩形横截面Nd∶YVO4激光晶体在有第三类热边界条件工作时,激光晶体温度场分布和晶体抽运面热形变分布.通过激光晶体工作特点分析,建立符合激光晶体工作状态的热模型.利用各向异性介质热传导方程的半解析求解方法,得出了矩形截面Nd∶YVO4晶体的温度场、端面热形变场的通解表达式.研究结果表明：当使用输出功率为15 W半导体激光器端面中心入射Nd∶YVO4晶体（晶体掺钕离子质量分数为0.5%）时,在抽运端面中心获得499.5 K最高温度和0.99 μm最大热形变量.和将第三类热边界条件近似为第二类热边界条件的通用做法相比更准确.这种方法可以应用到其它激光晶体热问题研究中,为有效解决激光系统热问题提供了理论依据.