查询词典 trace elements

Nature, most elements have two or more isotopes, the same kinds of elements in the quality of the various isotopes of different, but the types and proportion constant (except for radioactive elements). In 1961, the carbon content of the most abundant in nature, a kind of isotope, carbon-12 atom of a quantity and quality of C as a 12 mass units to it as "benchmarks" for all isotopes of an element according to the average abundance The ratio of the benchmark is the atomic weight of this non-prime, that is listed in the periodic table of atomic weights.

自然界中大多数元素都有两种或更多的同位素，同种元素的各同位素质量不同，但其种类和比例是恒定的。1961年，把碳在自然界含量最丰富的一种同位素，碳12的一个原子的质C量定为12个质量单位，把它作为"基准"，某种元素的所有同位素按丰度的平均值与基准之比，就是这种无素的原子量，即元素周期表列出的原子量。

Subwavelength binary optical elements, because of the special property traditional optical elements do not possess, expands the applied field of binary optical elements.

亚波长结构的二元光学器件，由于具有一些传统光学元件所不具备的特殊性质，因而扩展了二元光学器件的应用领域。

In this method, as each boun dary element is connected with finite number of elements, and coupled with boundary elements through finite number of elements, the merit of the FEM is therefore fully used.

这种方法规定各边界单元只和有限单元相接，通过有限单元实现边界单元的耦合，发挥了有限单元法组装方便的特长。

Through interviewing 3 different adulthood subjects with the open question method and subjects rating short scale items, the results showed that (1) all 3 age groups (young adults, middle-aged adults, and older adults) responded and rated mutual considerateness and tolerance as the most important elements for maintaining marital relationships;(2) all 3 age groups shared the belief that mutual respect, trust, encouragement, concern, understanding, care, and thanksgiving and responsibility were also important elements for maintaining marital relationships; and (3) all 3 age groups rated shared interest, activity, discussion topic, belief and value, and occupied time and personal space as the least important elements for maintaining marital relationships.

经由对三不同成人期已婚受试以开放式问题访问与受试在简短量表的回答，本研究结果显示彼此体谅、容忍是各年龄组受试认为是维系婚姻关系最重要的因素。彼此尊重、信任、鼓励、关心、了解、有责任感、相互照顾彼此感恩是各年龄组受试所共同认为是维系婚姻关系较重要的因素。有共同的兴趣、活动、话题、信仰、价值观与拥有各自的生活空间与时间是各年龄组所共同认为是维系婚姻关系较不重要的因素。

A determinant in which all elements are zero except the elements of the principal diagonal and the elements immediately above and below this diagonal is called a continuant.

一个行列式除了主对角元素以及紧靠对角线的上面和下面的元素外，所有的元素均为零者叫做连行列式。

It was found that the relationship between the nonsmooth appearance of leaf surface and its wettability is very strong, and the shape and distribution of the non-smooth elements are the decisive factors. The surface with regular distribution of convex elements presents large contact angle, strong water repellence, and good self-clearing ability, and that of hairy non-smooth elements takes the nextplace.

试验结果表明，植物表面具有的非光滑形态与表面润湿能力的强弱有极大的关系，非光滑单元体的形状和分布是影响植物表面憎水性强弱的决定性因素；规律分布凸包形非光滑单元体的植物表面的憎水性强，脱附效果好；规律密布表皮毛形非光滑单元体次之。

The paper researches both the present situation and the circumstances of application of domestic competitive intelligence, and emphasizes the importance and necessity of competitive intelligence, according to which the paper finds out the existing problems and sums up the elements of restricting the development of domestic corporations' competitive intelligence as following: the surroundings of competition and condition, the corporations' inner elements and the disjoint elements between the theory research and the practice application of competitive intelligence.

本文从探讨我国竞争情报理论研究现状和国内企业竞争情报的应用状况两方面入手，强调了竞争情报的重要性和必要性，并根据这些现状，找出现存的问题，总结了我国企业竞争情报发展的制约因素：竞争环境与条件因素、企业自身因素和竞争情报理论研究与实际应用脱节等。

C. Electro-osmosis technology: the role of electroosmosis in the main material to be dispersed elements to help them successfully penetrate into the skin and internal, the nature of the charge the same mutually exclusive, so the nutritional elements of the cathode current is imposed, can be nutritional elements into the skin tissue .

C。电渗透技术：电渗主要作用于将要分散的物质分子，帮助其顺利穿透并进入肌肤内部，性质相同的电荷相互排斥，因此对正极的营养分子施加正电流，可将营养分子推入皮肤组织。

C. electro-osmosis technology: the role of electroosmosis in the main material to be dispersed elements to help them successfully penetrate into the skin and internal, the nature of the charge the same mutually exclusive, so the nutritional elements of the cathode current is imposed, can be nutritional elements into the skin.

C。电渗透技术：电渗主要作用于将要分散的物质分子，帮助其顺利穿透并进入肌肤内部，性质相同的电荷相互排斥，因此对正极的营养分子施加正电流，可将营养分子推入皮肤组织。

Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

镧系元素属于周期表第六周期中ⅢB族，全部是固体金属，它们是镧、铈、镨、钕、钷、钐、铕、钆、铽、镝、钬、铒、铥、镱和镥共十五种金属元素，它们的外围两层的电子均是5d16s2，而外围第三层的f轨道电子却从零增加到14个，所以外围电子结构为4f0－145d16s2，而使这些元素氧化数均为＋3，化学性质极为接近，提炼时很难分开，它们的矿石又大多是多种元素混在一起的，更增加提纯难度，它们的原子序数为57－71，核内质子数逐个增加，因而对核外电子引力也不断增强，使原子半径随原子序数Z增加而减小，这就使镧系元素收缩、离子半径也缩小，这也使得Zr和Hf，Nb和Ta、Mo和W等原子和离子半径都很接近、也决定了它们彼此性质类似，以致难以分离、也使第Ⅷ族中第五周期的钌、铑、钯和第六周期的锇、铱、铂在性质上极为相似，因而称这六个元素为铂系元素。

Objective:To compare the response control and attention of Schizophrenic patients with that of the healthy controls by Integrated Visual and Auditorycontinuous performance test. To quantitate the impairment of cognitive function in patients, and to explore the relationship between cognitive function and the severity of the disorder.

目的：探讨精神分裂症病人在IVA持续操作测试中的反应控制能力、注意力等，并与健康人进行比较，从而量化精神分裂症病人的认知功能损害，并进一步探讨其认知功能与疾病严重程度的关系。

Main effective factors including subcooling degree, mechanical vibration, gas hydrate reformation, environment temperature, noncondensing gas and surfactant are analyzed.

指出过冷度、机械振动、重复生成水合物、环境温度、不凝性气体、添加剂是影响气体水合物生成的主要因素，还对R152a水合物的放冷进行了实验研究。