查询词典 thermal

When high power laser transmits in the atmosphere, thermal blooming will be generated. In order to study the phenomenon, the effect parameters to steady-state thermal blooming without wind are solved in detail by numerical simulation. It is studied that both epaxial light intensity and energy distribution at far field are affected by steady-state thermal blooming without wind.

为了研究强激光在大气传输过程中产生的热晕效应，采用数值模拟的方法，对无风时稳态热晕效应的影响参数进行了求解，探讨了无风稳态热晕效应对轴上光强以及远场能量分布的影响。

Through the simulation and analysis, the thermal characteristics of the medium and the thermal effects of laser beam are obtained. A superior pump cooling structure was selected and designed, and it is to be demonstred in this dissertation. 2 The thermal distortion effects in the slab mediam are experimently studied using auxiliary lens、Shearing Interferometer and Mach-Zehnder interferometer.

建立热效应分析模型，从热效应理论基础出发，就适合板条激光介质泵浦源的两种泵浦安排和三种常见的泵浦几何结构进行详细的理论分析，分析比较激光介质的热特性以及对激光束热效应的影响，最终选择出较优越的泵浦冷却结构，为传导冷却板条激光振荡器的设计提供参考依据。

In the second part, the theory of numerical simulation is introduced, including description of body configuration, elastic-plastic large deformation constitutive equation and finite element formula. It is followed by the derivation of equation from the basic theory of elastic-plastic deformation. The solution to temperature field, thermal stress, thermal strain, equivalent effective stress and equivalent strain is achieved then. In addition, we exposit the relation between machine load and thermal load in coupling analysis.

介绍了物体的构形及其描述，弹塑性大变形的本构方程、有限元列式；并进一步论述了弹塑性变形的基本理论，推导了弹塑性方程组；阐述了温度场的求解、热应力及热应变的理论概要，说明了等效应力与等效应变，并进一步阐明了在热力耦合分析中，机械负荷与温度负荷之间的关系；此外，还简介了Marc AutoForge程序结构的特点。

In the present work poly is prepared by chemical vapor deposition polymerization from [2.2] paracyclophane. Thermal gravimetrical analysis is used to study the thermal degradation. It is found that the onset of thermal degradation of poly in air is much lower than that in N2 due to the existence of O2 in the air.

用化学气相沉积聚合法制备了聚对亚苯基二亚甲基膜，由傅立叶变换红外光谱图证实了其化学结构采用热重分析研究了PPX的热降解性能，结果表明，在空气氛围中由于氧气的参与，其热稳定性比在N2中差，热氧化降解明显。

The results indicate that the different thermal expansions and elastoplastic properties and distributed randomness of various mineral particles composed of oil shale will lead to the nonuniformity of thermal field , deformation field and stress field in heating process , which makes the particles of oil shale deform incompatibly : and the release of product pyrolysis results in irreversible damages of oil shale material and structure . These are the main reasons for the thermal fracture of oil shale .

研究结果表明：组成油页岩各种矿物颗粒热膨胀和弹塑性性质的不同及其分布的随机性，导致油页岩加热过程中温度场，变形场和应力场的非均匀性，使得油页岩颗粒间变形不协调和油页岩热解产物释放引起油页岩材料与结构性能发生不可逆的劣化损伤，这是油页岩发生热破裂的主要原因；热传导方式加热油页岩，温度的传递比较缓慢，加热井和生产井的间距不宜过大，对油页岩储层性质存在差异时，注热井应选择较高热导率的区段；油页岩的层理对油页岩地下原位开发形成渗透带至关重要，油页岩达到热解温度会产生附加的膨胀力，首先在层理处开裂，应充分利用油页岩层理赋存条件改造其渗透性。

Incurrent research, aiming at the rupture problem engendered in the shooting process of acertain 5.56mm automatic rifle, the strain and stress distributions on the cartridge caseunder the action of axial pull have been analyzed. Based on the theories of elastic-plasticmechanics and contact mechanics, a mathematic and physical model of the cartridge-caseand chamber system has been set up; and based on the platform of the general softwarepackage APDL of ANSYS for finite element analysis, a parameterized model of thecartridge-case and chamber system has also been established. The method for nonlinearFEA has been adopted to analyze the stress distribution on the entire cartridge-case andchamber system, and the method of contact element has been employed to investigate thecontact stress between the cartridge case and chamber, and then the influences of frictioncoefficient and locking space on the static and dynamic stress and strain response of thecartridge case and chamber to the action of power gas have also been discussed. On thebasis of a lot of numerical tests, a kind of element Plane13, which is concentrated incoupled computation of heat and construction, has been used finally to simulate thetransient response of the cartridge-case and chamber system to the power gas. Throughloading the temporary thermal characteristics of explosive gas in the procedure of emulate, the corresponding transient thermal stress distributed on the entire system under thecombined load of transient thermal stress and transient pressure has been obtained. Owingto these comprehensive considerations, the numerical results obtained in this paperrepresent the actual situations comparatively exactly.

本文针对某5.56mm自动步枪在工作中出现断壳的问题，分析了弹壳在轴向拉力作用下的应力应变；基于弹塑性力学及接触理论，建立了弹壳弹膛系统的数学、物理学模型，在通用有限元ANSYS软件的参数化建模工具APDL平台上，建立了弹壳弹膛系统的参数化模型；采用非线性有限元法计算了弹壳弹膛系统的整体应力，引入接触单元法分析弹壳和弹膛的接触压力，探讨了在不同的摩擦系数和不同的闭锁间隙对弹壳弹膛静、动态响应的影响；本文进行了大量的尝试，最后确定采用热、结构耦合单元Plane13，在计算中加载了火药气体的温度历程，成功的获得了弹壳弹膛系统在瞬态的热载荷和瞬态的压力载荷同时作用下弹壳弹膛系统的热应力数值解，考虑因素全面，比较真实的反映了弹壳弹膛系统在火药气体压力和热载荷下作用的情况。

The system consists of the following procedure: pre-concentration of metallogenic matter in living organisms in primary depositional basin; solution, absorption and concentration of metallogenic matter in organic matter and organic thermal fluid generated from organisms during lithogenesis; migration of metallogenic matter in organic thermal fluid from basin to mountain region and activation of metallogenic elements by organic matter and organic thermal fluids in sedimentary strata in mountain regions during basin compaction and mountain building; metallization due to reactions between inorganic fluid and organic fluid bearing metallogenic matter and because of reductions and absorptions by organic matter in mountain regions.

生物成矿系统的内容是：在原始盆地接受沉积时，生物对金属成矿物质就存在预富集作用；在成岩过程中，生物转化为有机质及有机热流体，对金属成矿物质存在溶解、萃取、富集作用；在盆地压实和造山活动中，盆地中有机热流体向造山带运移，此过程流体携带大量成矿物质，对金属成矿物质存在迁移作用，而处于造山带沉积地层中的有机物及有机流体对金属成矿元素存在活化作用；盆地有机热流体与造山带含金属流体会合，以及造山带有机质及有机流体对金属元素进行还原和吸咐，最终形成金属矿床，对金属成矿物质存在成矿作用。

The biometallogenesis system of Jinya gold deposits consists of the following procedure: pre-concentration of gold and metallogenic matter in living organisms in Luodian-Danchi rift depositional basin; solution, absorption and concentration of metallogenic matter in organic matter and organic thermal fluid generated from organisms during lithogenesis; migration of gold and metallogenic matter in organic fluid from basin to Lingyun underwater carbonate platform and concentration at its boundary convex (palaeo-blind-mountain) during basin compaction ; metallization due to depth thermal fluid making organic fluid thermal degradation and forming new fluid which riches in gold and sulfur, and the fluid migrating upward and depositing in upside ore-controlling structures because of absorptions by organic carbon and atc.

通过研究金牙金矿作用的生物成矿系统内容为：在早、中三叠世罗甸—丹池裂谷盆地接受沉积时，生物对金等成矿物质就存在预富集作用；在成岩过程中，生物转化为有机质及有机热流体，对生物及沉积物中的金等成矿物质存在溶解、萃取、富集作用；在盆地压实成岩作用中，盆地中有机热流体向凌云水下碳酸盐台地运移，并在台地边缘外凸部位集中，此过程流体携带大量成矿物质，对金等成矿物质存在迁移集中作用；深部热流上侵使有机流体发生降解和释放金的热作用、形成高含金的有机热液，含金热液上移在构造通道中沉积并被有机碳再次吸附，最终形成金矿床，对金存在成矿作用。

In this acticle, thermal oil velocity was determined in accordance with Reynold criterion, in order to be convenient for heat transfer of thermal oil and prevent thermal oil carbonizing.

为了便于导热油的传热和防止结焦现象，根据雷诺准则确定了导热油在管束内的流速。

Studies on the trinitration of toluene showed that, the trinitration temperatures were high enough to intensify oxidation, and the two thermal hazard evaluation methods mentioned above couldn\'t evaluate the situation well. Results were found from the reaction calorimeter experiments that lower reaction temperature and decelerating dosing rate could prevent thermal accumulation and decrease thermal hazard efficiently.

在对三段硝化反应进行热危险性评估时发现，三段硝化反应的温度很高，氧化副反应随温度升高而加剧，风险矩阵法和失控情景分析方法难以准确评估该情况下的热失控危险，但实验结果表明降低反应温度，减缓加料速率能有效地防止热积累，减小反应过程中的热危险性。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。