查询词典 temperature gradient

The temperature of surface concrete varies with environmental temperature, but the conductibility of inner concrete is very poor. As a result, a quick decrease of environmental temperature will lead to large temperature gradient and then tensile stressdevelop soon in the thick direction, which will probably occur on the entire cross-section.

混凝土表面温度随外界温度波动而波动，但内部的导温性能很差，所以在外界温度骤降时将引起很大的温度梯度，从而在厚度方向上拉应力发展很快，这极易引起全断面拉应力发生。

The results show that the increasing Marangoni number will lead to more nonlinear distribution of temperature field, but streamfunction of the cell center; vorticity on the wall and peak value of velocity diminish first, then increase, finally lose stability. The thermocapillary convection in the whole liquid zone appears to get stronger along with the augmentation of Prantal number. The effect of increasing of Biot number on temperature and flow fields is not obvious although the convection is strengthened a little. As increasing the aspect ratio A, thermocapillary convection induced by temperature gradient and liquid viscosity becomes stronger.

结果表明：温度场的非线性分布随着Ma数的增大而加剧，但对流涡胞中心流函数、壁面涡量和轴向、径向速度峰值并不象温度场随着Ma数的增大而单调增大，而是先减小，然后增大，最后失稳，表明Ma数对热毛细对流的影响比较复杂，针对不同的物理模型，会导致完全不同的流态；Pr数愈大，流体的热扩散能力在粘性扩散与热扩散能力之比中愈占支配地位，当Ma数一定时，热毛细对流随Pr数的增大在整个液体区域内有增强的趋势；Bi数增大，热毛细对流有所增强，但不甚明显；A的增大使得由温度梯度和流体粘性诱导的热毛细对流随之增强。

That is, we can consider the raised temperature a single impulse and predict the ambient temperature and temperature gradient of the sediments by fitting with the cylindrical temperature decay function.

另外我们也发现直接从温度梯度的资料用该函数来推求最终之背景温度梯度的方法又优於先用该函数推求背景温度再求背景梯度的方法。

And then the temperature field and configure deformation of the primary and second mirror on the function of temperature gradient of axial, radial and circle direction. The characteristics of the dichroscope with body absorbing and face radiation are stated and the transient temperature field is analysized. The temperature field and configure deformation in different time is known and the influence on visible and middle infrared light is analysized. The advice to thermal control is put forward and the influence of self-radiation of the dichroscope to the detector is analysized.

接下来分析了主次镜在轴向、径向、周向温度梯度作用下的温度场分布及面型变形，阐述了分色镜的体吸收、面发射的特性并建立了分色镜的模型，对分色镜进行了瞬态温度分析，得到了不同时间内分色镜的温度场分布及面型变形，确定了其对可见光和中波红外光的影响，提出了温控的建议并分析了分色镜的自辐射对探测器的影响。

Numerical simulation results show that the fluid flow in Lost Foam Process was different from that in an ordinary green sand mold, the molten metal flow forwards in a circular-arc shape from the ingate, meanwhile, the nature of the gating system influenced the filling process notably. As the polystyrene pattern decomposition has a strong quenching effect on the flowing metal fornt, a high temperature gradient was formed at the flowing metal front, this resulted in the dropping of temperature of the metal to the liquidus temperature quickly and decreased the flowability of molten metal, the temperature distribution in the metal behind, however, was even. The properties of the pattern and the coating affected the temperature distribution remarkably.

从内浇口开始，金属液呈放射状均匀向前充填，同时浇注系统性质显著影响金属液充型过程的流场；由于聚苯乙烯模样气化吸热对金属液的激冷作用，在金属液流端部区域产生很大的温度梯度，使得端部区域金属液很快降至液相线温度，降低了金属液的充型能力，而后续金属液中温度分布则比较均匀，模样性能、涂料性能显著影响这一温度分布特点。

The results show that there are apparent temperature gradient, pressure gradient and concentration gradient in the mold.

对负压消失模车间排放废气的组成、温度、压力和流量进行了测试，选择了催化燃烧法作为消失模废气净化方法。

Barrel is the key part of artillery. In shot process, propellent gas of high pressure and high temperature flows in the tube at a high rate of speed, which brings an upheaval to the temperature field of the composite barrel. As to the composite barrel with metal inner, its poor thermal conductivity is more likely to cause uneven temperature distribution and bigger temperature gradient, to produce improper deformation and to make the work temperature of metal inner rise, all of which will affect the life span of barrel.

身管是火炮的关键部件，在火炮发射过程中，高温、高压的火药燃气在身管内成脉冲式高速流动，使身管受到急剧的加热，引起身管壁内的温度急剧变化，而对于带金属内衬复合材料身管，由于复合材料导热性能较差，更容易引起非均匀温度分布以及较大的温度梯度，产生不合适的变形，也会使身管的金属内衬的工作温度升高，从而使得身管的寿命降低，同时身管的发热会引起其刚度的变化，增大射弹散布。

ANSYS is a finite element simulation software used to simulate the temperature field in selective laser sintering.By using the ANSYS parameter design language,the density of the thermal flow,the velocity and the path of scanning can be controlled.The effect of the scanning path on the temperature field in the SLS process is studied. Balling,which occurs at the end of the scanning line,is caused by the dissymmetric temperature field and the great temperature gradient.

利用有限元分析软件AN SY S，对激光烧结温度场进行了数值模拟，建立了激光烧结薄板的温度模型；运用APDL语言控制热源的热流密度、移动速度以及扫描轨迹；研究了激光行程对烧结温度场的影响，扫描端点温度场的不对称及较大的温度梯度造成了端点球化现象；激光扫描线间的耦合作用使端点球化现象随扫描线的增加而逐渐显著。

The reaction and influence involving the mechanism of crystal and the interior flow field was developed when impeller machine transferring bittern .Based on the measurement through PIV and numerical simulation,the reason that deposition mass rate and removal mass rate is changed along with the increase of crystal layer was analyzed. Moreover,the viewpoint was developed that the change is the result of the reaction among temperature gradient,velocity gradient,turbulent intensity and the temperature stress within the crystal layer.

提出叶轮机械输送卤水时，结盐过程与内部流场相关且相互影响、相互作用，并在进行PIV内流测试和数值模拟的基础之上，综合运用多学科理论，依据Kern-Seaton模型，分析了沉积率与脱除率随盐析层增长而发生变化的原因，提出了这种变化是温度梯度、速度梯度、湍动度及盐析层内部温度应力等各种因素交叉影响的结果。

The trail bridge design,the mixture performance test,the temperature between the different layers of the deck surfacing,the traffic investigation and the surface performance observation are introduced in this article.The basic performance of the mixture used in the trial bridge is analyzed through rutting tests at high temperature,bending tests at low temperature,fatigue tests of the composite beam and pull off tests.The rule of the temperature gradient distribution in the pavement and the variety relation ...

介绍润扬大桥钢桥面铺装试验桥的方案设计、试验研究、温度测试、交通量调查和使用性能跟踪观测，通过混合料高温车辙试验、低温弯曲试验、复合梁疲劳试验以及拉拔试验等分析实桥试验沥青混合料基本性能，阐述铺装内各层温度梯度分布规律及与大气温度变化关系，通过使用性能跟踪观测介绍浇注式沥青混凝土+环氧沥青混凝土新型铺装结构的工程效果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。