本底

And dissolved background radiation in environment by adjusting ampere meter's mechanical null point.

调节电流表机械零点消除环境本底辐射。

Using simulations, we found the best geometry of the collimator is the one with a rectangle aperture and all of them are placed in two groups with an orthogonal orientation, which will have good resolution and sensitivity, and also be easy to manufacture. The rectangle aperture gives good imaging accuracy along the short side, and wide viewing along the long side. The orthogonal orientation for collimators will allow us to observe the source and the background simultaneously.

通过模拟发现，综合考虑了对强源成像的分辨率以及对弱源的灵敏度，以及加工的容易程度，论文提出了最优的准直器设计方案是用长方形准直器，并且将所有准直器分成两组，垂直摆放，一方面可以约束两个方向上的成像质量，同时具有较高的成像分辨率和定位精度，并且非常利于定点观测时的源和本底同时观测。

Results The choroid plexus, hypophysis, area postrema and pineal body, namely, circumventricular organs and ependyma as well as pia mater layers were stained by the HRP reaction products.The HRP reaction products were observed in the tissue space of membrane mucosa nasi, around the fila olfactoria and venules, and within the venules under the light microscopy and electron microscopy, also. Scintillation count showed that the radioactivity of the CVOs was higher than that of the background. The radioautography showed that the scattered grains of silver existed within the cells of neurocyte layer also.

结果 在脑室周围器官及脑室周围室管膜、软脑膜层有HRP反应产物的聚集，在鼻中隔的鼻粘膜下组织间隙、嗅丝周围间隙及静脉周围和管腔内也可见到HRP反应产物；液闪计数显示，大白鼠的脉络丛、脑垂体、最后区、松果体等脑室周围器官放射性活度明显高于本底；放射自显影显示大白鼠脑组织神经层细胞内有散在分布的银颗粒。

laser technique ; polarized light ; wave plate ; phase retardation

由于实验过程中有各种因素，如光源的起伏，光电探测器的动态范围、本底电流等，对用测量光强来确定波片的延迟量无疑会直接

The results obtained are then compared with practical individual limits and the intervention level of the radiation protection system.

阐述了公众天然本底辐射的组成和所致的剂量水平，并把它和公众在实践中的辐射剂量限值以及干预中的干预水平所对应的可避免剂量相比较，讨论了它们的含义。

The amounts of 95Zr in collected leachate of paddy soil, sea mud and red-yellow earth were about 5.33%~7.68%, 0.77%~1.32% and almost 0 of labelled amount respectively.

结果显示：当952：经模拟降雨引入系统后，gszr在蚕豆中的比活度，以茎叶和豆壳中最高，根部次之，而豆粒中最低，仅稍高于本底水平。

Objective To evaluate the improvement of diagnostic accuracy with background region of interest rectification for 99mTc-DTPA renography in patients with GFR≤30 ml·min-1·（1.73 m2-1, and to compare with plasma clearance of 99mTc-DTPA (GFRp, dual plasma sampling method).

目的 以99mTc-DTPA血浆清除率为标准，评价在重度肾功能不全[GFR≤30 ml·min-1·（1.73 m2-1]患者GFR的评估中，本底矫正在提高99mTc-DTPA肾动态显像检查准确性中的价值。

The databases available include two organism biodiversity background database: database of birds, database of Amphibia, Reptilia and Mammalia. Five specific biodiversity databases include: database of anti－pollution plants and pollution－indicator plants, database of ornamental plants, database of pests and harmful animals, database of wetland biodiversity.

目前提供的主要数据库包括2个有机体多样性本底数据库：鸟类资源库、两栖爬行动物及哺乳动物库；5个专类生物多样性数据库：绿化观赏植物库、抗污染植物库、环境污染敏感植物库、害虫害兽库、湿地生物多样性库。

Therefore, the ultra-short beam current pulse of 2ns is able to be perfectly reconstructed. Through data processing, singular points, part of high-frequency noise and background noise are eliminated.

通过后期的信号处理，剔除了采样数据中的奇异点、部分高频噪声和本底噪声，消除了由于触发和被测信号不同步的客观条件造成的波形晃动。

In the calculation, the background value was subtracted to improve the measuring accuracy to a great extent.

在数据处理中，采用扣除本底的方法大大提高了测量精度。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。