物计量

Double chain naphthyurea/thiourea piperazine derivatives could act as a fluorescent chemosensor not for aromatic dicarboxylate but for linear dicarboxylate especially for pimelate anion.

双链萘脲基或硫脲基哌嗪化合物与直链二羧酸盐络合具有较高的稳定常数和1∶1的化学计量比，两者通过六个氢键形成双点结合的络合物。

The disubstituted ureas and the catalyst could be separated by addition of water and the catalyst could be reused without deactivation.

新型高效的菲咯啉钯-离子液体含氮化合物羰化催化剂体系，以苯胺为反应物时该体系的转化频率可以达到6000mol/mol/h；氢氧化铯-离子液体催化剂体系，可以在不加入化学计量脱水剂的条件下活化二氧化碳与脂肪族胺反应得到二取代脲，反应结束后可以通过加入水实现产品和催化剂体系的分离，催化剂体系可以重复使用。

Methods Specific endothelial cell markers with immunohistochemistry and microvessel density with morphometry in 28 casas of laryngopharyngeal malignant melanoma.

方法应用免疫组织化学染色法检测28例咽喉部恶性黑色素瘤中血管内皮细胞特异性标记物Ⅷ因子相关抗原（factor FⅧ-related antigen， FⅧ-RAg）和CD31的表达，并通过形态学计量法计数肿瘤内微血管密度。

With their shared mechanistic worldview, the global discourses of conservation biology and natural resource management have promoted the rational use of key material resources among the Yami fetishisms, under the influences of ever-expanding global commodification and conservationism, have become a hybrid that expresses contested worldviews and social relations between genders and across generations.

自然资源管理与保育的全球论述介入兰屿雅美族的生活世界，并提倡著一种机械论式的理性计量世界观。当商品流入与保育概念强加在原有雅美的物神信仰时，在不同性别与年龄层引发多重宇宙观相嵌的混合激荡。

The standard materials of geology,chemical prospecting,heap leaching,gold ornaments and lossfree detecting series of gold and the standard analytical method as well as professional standard method of analysis promulgated all by the state ity are introduced emphatically.

具有&化学成分计量物&之称的黄金标准物质，在分析测定中起到传递准确值的作用，使不同地点、不同方法技术、不同时间测得的量值具有对比性。黄金标准分析方法体现了现代黄金分析方法的特点和水平，体现了现代

No matter it is in main structures or secondary structures, the usage of the concrete count is much steres. The material is used in big quantity and its variability is complex, it will influence the security of the structures directly whether the quality of the concrete is good or bad.

不论是在主要结构或者次要结构方面，混凝土的使用动辄就是数十方甚或数百方的计量，在这数量大且变异性复杂的复合材料当中，混凝土的品质优劣会直接影响结构物的安全。

It is established through a series of comparative measurements using a hierarchy of measurement procedures and calibrators.

结果 溯源性是指测量结果能与一公认的标准相联系的属性，它通过一系列对比测量而建立，对比测量中的测量过程和校准物有不同的计量学等级，较高等级的称参考测量过程和参考物质，可统称参考系统，是量值溯源的基础。

The method of metrological traceability of values for catalytic concentration of enzymes is now widely recognized as the combination of reference materials, reference measurement procedures and network of reference laboratories. Reference materials that are value-assigned using an internationally agreed upon protocol play an important role in this system and now reference materials or calibrators have come to our attention in our country.

随着人们对酶标准化工作和计量学溯源体系的深入认识，参考方法、参考物质和参考实验室网络的结合成为国内外普遍认可的实现酶活性测定标准化的重要途径，而使用公认的酶校准物作为载体，将测定结果的数值在参考方法和常规方法间进行准确性的传递是目前酶标准化工作的关键环节之一。

Compared the voltage negative feedback wire-feeding speed regulation system supported by current positive feedback with the rotational speed negative feedback regulation system, the equivalent condition of the two systems is obtained. Then, a wire-feeding speed regulation circuit for the CO_2 welding machine is designed based on TL494 chip, which has the self-protective function under the condition of current overloading.

通过对电压负反馈配合电流正反馈的送丝调速系统与转速负反馈调速系统的比较，得出了这两种调速系统的等效条件，并采用电压负反馈配合电流正反馈技术，设计了一种以TL494为核心的具有过电流截止保护功能的CO_2焊机送丝调速电路。

Make a model to help you determine the optimal number of tollbooths to deploy in a barrier-toll plaza.

建立一个模型来确定在一个容易造成阻塞的收费区中应该设置的收费亭的最优数量。