查询词典 threshold exposure

Based on the well-know Pennes'' bioheat equation,we calculated theoretically temperature field of HIFU-induced BFR in tissue,and measured spatial temperature rise in BFR induced by HIFU in freshly excised cow liver at constant acoustic intensity and exposure time, and studied the effects of the physical parameters of focused ultrasound transducer such as frequency,outer radius and curvature radius,focal depth, and acoustic intensity and exposure time on the temperature field of HIFU-induced BFR.

采用生物热传导方程理论计算了HIFU生物学焦域温度场，采用微型热电偶探针测量了HIFU辐照离体牛肝时靶组织温度分布；研究了聚焦超声换能器的物理参数、辐照深度和治疗剂量对HIFU生物学焦域温度场的影响；研究了HIFU在牛肝组织中的传播衰减。

This problem was found, to pass the test to determine the exposure time to take a fresh copy and exposure.

发掘这一题纲后，给不堵住测验猜测曝平工夫，从头晒版。

Blog exposure is important and one way to get this type of exposure is through blog indexing.

博客曝光的重要方法之一得到这样的曝光率是通过博客索引。

The results showed as followed :（ 1 ） The most important factor of atmospheric general circulation controlled and influenced the immigration of WBPH＇s populations was the patterns and the tempo-spatial changes of potential height field on 850hPa isobaric surface,（2） There were relative coincident air streams with a northern exposure on 850hPa isobaric surface during the migrations northward of WBPH and there were concurrent airflows with a southern exposure on 925hPa isobaric surface during the migration southward.

利用MM5中尺度数值预报模式和由PCVSAT系统接收的气象数据对2个典型的白背飞虱南、北迁降落过程的大气背景进行了数值模拟和客观分析，模拟和分析结果表明：（1）850hPa等压面上气压场的配置及其随时空的演变是控制和影响白背飞虱迁入的最重要的大气环流因素。

The Zn concentration in leaf and leafstalk increased with increasing Zn supply from 0 to 160 mgL^(-1), but had no increase or even decreased when the Zn supply was higher than 160 mgL^(-1). The Zn concentration in root exhibited a positive correlation with Zn supply and its exposure time, and the kinetic curve of Zn uptake fitted linear-quadratic model, i.e., fast linear uptake first and slow saturation uptake later, with the dividing point at about 1-2 hours' exposure, which could be related with the Zn adsorption on root cell wall and the Zn transportation across the cell membrane.

在0160 mgL^(-1) Zn处理下，植株叶片和叶柄Zn含量随Zn处理水平的提高显著增加，Zn浓度大于160 mgL^(-1)后，植株叶片和叶柄Zn含量不再随介质中Zn浓度的提高而增加，根系含Zn含量与介质中的Zn浓度和培养时间呈正相关，且根系Zn吸收动力学曲线具有二型性，即开始为快速的线性吸收，随后是较缓慢的饱和吸收，两者分界点约在12h，这可能分别与根细胞壁吸附Zn和Zn跨根细胞膜运输有关。

In this paper, the artificial soil method was applied to compare the toxicological effects of lindane and carbofuran on earthwormsusing acute exposure experiment and subacute exposure experiment.

采用人工土培养法，通过急性和亚急性暴露实验，研究了林丹和呋喃丹对赤子爱胜蚓存活、生长和繁殖能力的影响。

aim: in order to investigate different exposure of magnetic field on the learning memory of mice when the product of magnetic field intensity and magnetic exposure time is equal.

目的：观察磁场强度与磁场暴露时间的乘积相等时，恒定磁场的不同暴露方式对小鼠学习记忆能力影响的差别。

Drilling of the jugular tuberculum is the key step for access to the central clival depression. Partial mastoidectomy can result in a significant increase in surgical freedom, but only a modest increase in the exposure of the central clival depression. Removal of total condyle and resection of the lateral mass of C1 could not increase the surgical freedom and exposure of the central clival depression.

磨除颈静脉结节为经FLA入路显露斜坡中央凹陷区的关键步骤；部分乳突切除可进一步改善操作空间，但未能显著增加斜坡中央凹陷区的显露；全切枕髁和侧块不能显著增加斜坡中央凹陷区的显露和操作空间。

Using the modified electron beam exposure system, we have studied the exposure and developing characteristics of two kinds of resists, which are sensitive for electron beams, polymethylmethacrylate and the copolymer of methylmethacrylate and methacrylic acid P

另外在电镜原有的集成电路试样观察座上设计加工了一个可360°旋转的载物台，载物台X、Y方向移动分辨率为1μm，这样，通过控制工件台和电子束的移动即可实现精密的套刻。

When there is no trailing of the minor planet image (or you are measuring the middle of a trail) the time of observation is the mid-exposure time. If you are measuring both ends of a trail, then one end is associated with the start of the exposure, the other with the end.

如果你测量的是小行星拖线的中部或该小行星没有明显的拖线，那么你应该使用你暴光时间的中点时刻作为该测量点对应时刻，如果你既测量了起点又测量了终点，那么你应该分别对应的是暴光的起始时间和终了时间。

This paper designs the communication system of radio telescope FAST.

针对500m口径球面射电望远镜FAST分布式控制系统的特点完成了其通信系统的设计。

Political sheep's step-by-step a large number of fossils unearthed in the county soil Ma Ali after rural village in the middle of sallow pelitic siltstone.

步氏和政羊化石大量出土于广河县阿力麻土乡后山村，产于灰黄色泥质粉砂岩中。