衰减

The target and background physical model and infrared radiation are constructed and calculated separatedly based on Vega. Then the attenuate factor of atmosphere between scene and infrared sensor was calculated from atmosphere attenuate model. The infrared imaging system is simulated for generating the final infrared image.

针对低空红外预警的复杂场景，分别建立了目标和背景的辐射模型；考虑大气对红外辐射的衰减作用，建立了大气的传输模型；根据探测器的成像特性建立了成像系统响应模型。

The influence of seriate line-source to the decay of solute concentration in streams is not simply equal to the addition influence of several point-sources.

连续线源&对河流水体中溶质衰减过程的影响，不简单等同于几个&点源的迭加。

The variation regularity of the sheat strength index changing with the times of wet-drying cycling under upper loads was gotten in the test, it was also found that the upper load have the obvious restraining to the swelling-shrinkage deformation and the attenuation of shear strength.

得到有荷条件下膨胀土抗剪强度随着干湿循环的变化规律，并发现荷载对土的胀缩幅度和强度衰减有明显抑制作用。

The fire resistance of unprotected steel is impaired by its high thermal conductivity and by the fact that its strength decreases sizably at high temperatures.

由于未加保护的钢材的高热导率和其高温时相当大的强度衰减，它的耐火性并不理想。

In 2007, we performed 804 SPET/CT services in many aspects. Integrating CT was used for CT attenuation correction or morphological image fusion.

统计2007年当年共计进行SPET/CT造影804例，主要应用CT在辅助进行衰减校正或病灶定位。

Results: In 2007, we provided 602 SPET/CT services in myocardial perfusion scan for attenuation correction and 202 SPET/CT services in other scans for image fusion. Among 64 regional bone SPET/CT services, we noted 2 (3.13%) significant motion artifacts and 2 (3.13%) streak artifacts induced by beam hardening effect while among 25 Ga-67 local SPET/CT services. According to the features including low tube currents and slow rotating speed of this SPET/CT, some problems such as the patient safety, longer scan time, alignment mismatch and radiation protection would be analyzed and discussed.

结果：2007年804例SPET/CT造影中，602例心肌血流灌注断层摄影进行衰减校正，共202例病例进行影像融合，其中鎝－99m-MDP局部SPET/CT发生「影像上明显可见的移动假影」的比例为3.13%(2/64)，镓－67局部SPET/CT发生移动假影的比钊则为24%(6/25)，因射束硬化效应所造成的条状假影有产生干扰融合影像判读的情形，其他问题包括SPET/CT之CT低管球电压及低转速之机器特性、受检者的安全、较长的造影时间、对位错误及辐射防护筝。

Sonographic features included irregular shape, microlobulation, spiculated margin, halo, posterior attenuation, microcalcification, ductal distortion.

病变的超声征象包括：形态不规则、小分叶、毛刺、强回声晕、后方回声衰减、微小钙化、导管扩张。

Uses: Cosmetic Treatment: Rejuvenates the skin, attenuates the wrinkles and the expression lines, natural generator of collagen, nourish and hydrates, skin regenerator, prevents the striae, attenuate the spots of skin, protects the dehydration by wind or dry atmosphere.

用途： 美容治疗： rejuvenates皮肤，减轻皱纹，并表达线，自然生成胶原蛋白，营养和水合物，皮肤再生，防止皮纹，衰减点的皮肤，也保障了脱水风或干燥的气氛中进行。

This paper presents a rapid method for the characterization of sulphonated condensationpolymerized products of phenolphthalein and dichlorodiphenylsulfone membrane by using infrared attenuated total reflection and diffuse reflectance spectroscopy.

采用漫反射及衰减全反射红外技术，快速鉴定酞侧基聚砜膜的改性水平，得到了磺化后—SO3H基团的红外光谱差谱。

Changes in synaptic plasticity in dopamine neurons of the ventral tegmental area may contribute to circuit modification induced by many drugs of abuse, including cocaine.

这种LTP的易化产生是由可卡因诱导衰减GABA受体而产生的。GABA受体可以抑制多巴胺神经元的活动。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。