The question of virus occurrence and survival in sediments was addressed only after improved detection methods were at hand . 淤泥中病毒发生和存活的问题只有在改进了检测方法以后，才能够得以了解。
Copper was reduced from 20 mg/l to below detectable limits by sulfide precipitation from a gold-ore extraction wastewater . 用硫化物沉淀法可将金矿抽提废水中的铜含量从20毫克升降到可检测标准以下。
The emission observed while holding at the proof load provides another piece of information regarding the imminence of failure . 在验证载荷施加期间，检测声发射还能额外地提供有关破坏临近程度的信息。
A compromise must be reached between the "thinness" of the surface larger examined and the intensity of the infrared spectrum obtained . 应就被检测材料表面层的厚薄同红外线光谱强度之间的关系进行适当选择。
If an aerosol counter is used to monitor the concentration of particles in the emerging air, one finds that the concentration falls off with decreasing flow rate . 如果用一台气溶胶计数器检测射出气流中的粒子浓度，就会发现浓度随流速的降低而减少。
The initial determination should be followed by periodic assays during the working season, so that changes can be detected before exposure reaches a serious level . 在使用期间，应于初始测定之后进行定期测定。因此在暴露达到严重程度之前，可以检测出它的变化。
Investigators at aerojet-general corporation and other organizations have applied acoustic emission with multiple transducers, and triangulation techniques to the detection and location of flaws in large structures . 通用航空喷气公司和其他机构的研究人员用多路传成器和三角定位技术将声发射应用于大型结构的袭纹检测与定位工作中。
Keep up allowable density , detect tiny components 密度容限，检测出微小的元件。
Measurement of vehicle speed based on harris corner detector 角点检测的车辆测速
