substitutional

简明释义

英[ˌsʌbstɪtjuːʃənəl]美[ˌsʌbstəˈtjʊʃənl]

adj. 取代的；代用的；代理的

英英释义

单词用法

同义词

反义词

例句

1.Objective To investigate the alteration of serum muscle enzyme levels in patients with hypothyroid myopathy by substitutional treatment with thyroid hormone.

目的探讨甲减肌病患者甲状腺激素替代治疗前后血清肌酶谱的变化。

2.Also considers structural features: grain size, interstitial and substitutional solutes, precipitates, second-phase particles, and eutectoids.

亦考量结构特征如：晶粒、格隙型固溶体和置换型固溶体、出物、二相颗粒和共晶。

3.The high concentration of substitutional elements in ferrite results in distorting lattice of ferrite and thus the diffraction peaks of ferrite deviate to little Angle.

代位元素在铁素体中的固溶，导致了铁素体晶格的畸变，进而引起了衍射峰向小角度方向漂移。

4.The markets, enterprises and the country are in the substitutional relation, and they are the systems which created by human beings in order to reduce the uncertainty.

市场、企业和国家是一种三角替代关系，都是为了降低不确定性而由人类创造的制度安排。

5.The results show that Cu solubilizes in W and the substitutional solid solution is formed.

结果发现，铜固溶在钨中，并形成了置换固溶体。

6.The function of anti-account has un-substitutional effect under the condition that the computerized accounting information system makes mistakes in the treatment of economic business.

反记账功能在电算化会计信息系统经济业务处理发生错误等情况下有着无可替代的作用。

7.Supplementary and substitutional medicine can be defined as a group of institutions for health care in main stream medicine.

补充替代医学可以定义为除主流医学外的一组医疗保健形式。

8.The substitutional solid solution formed by cobalt and bismuth molybdate will improve the conductivity and sensitivity of this gas sensor to reducing gases.

钼酸铋和氧化钴取代后的固溶胶对吸收将提高该材料对还原性气体的敏感能力。

9.Methods The serum levels of enzymes in 66 patients with primary hypothyroidism were reviewed and compared before and after substitutional treatment with thyroid hormone.

方法回顾分析66例甲减患者激素治疗前、后血清酶检测资料。

10.In genetics, substitutional mutations can lead to significant changes in an organism's traits.

在遗传学中，替代性突变可能导致生物特征的显著变化。

11.The substitutional doping of silicon with phosphorus enhances its electrical conductivity.

用磷进行的替代性掺杂使硅的电导率增强。

12.In the field of materials science, substitutional alloys are created by replacing some of the original metal atoms with different ones.

在材料科学领域，替代性的合金是通过用不同的金属原子替换部分原始金属原子而创建的。

13.Researchers are exploring substitutional methods to improve the efficiency of solar cells.

研究人员正在探索替代性方法来提高太阳能电池的效率。

14.The substitutional approach in chemistry involves replacing one atom in a compound with another.

化学中的替代性方法涉及用另一个原子替换化合物中的一个原子。

作文

In the field of chemistry, the concept of substitutional alloys plays a crucial role in determining the properties and applications of various materials. A substitutional alloy is formed when one metal atom replaces another in the crystal lattice structure of a metallic solid. This process is known as substitutional (替代的) solid solution formation, where the new atoms must be similar in size and chemical properties to those they replace. This characteristic allows for the creation of materials with enhanced physical and mechanical properties, which can be tailored for specific applications. For instance, brass, an alloy of copper and zinc, exemplifies the benefits of substitutional (替代的) alloying. In this case, zinc atoms substitute for copper atoms in the crystal structure, resulting in a material that is not only stronger than pure copper but also more resistant to corrosion. Such enhancements make brass a preferred choice in plumbing fittings, musical instruments, and decorative items.Another notable example is stainless steel, which often contains chromium and nickel as substitutional (替代的) elements. These additions improve corrosion resistance and strength, making stainless steel a vital material in both construction and kitchenware. The ability to modify the properties of metals through substitutional (替代的) alloying is a testament to the ingenuity of material science, allowing engineers and designers to create solutions that meet specific needs.The concept of substitutional (替代的) alloys is not limited to just metals; it can also be applied to semiconductors. For instance, silicon can be doped with phosphorus or boron atoms, which act as substitutional (替代的) impurities. This process alters the electrical properties of silicon, enabling its use in electronic devices such as transistors and diodes. The careful selection of these dopants is essential to optimize performance and functionality in various applications.Moreover, the study of substitutional (替代的) solid solutions extends to the field of geology, particularly in understanding mineral compositions. Many minerals exhibit substitutional (替代的) behavior, where ions of similar size and charge can replace one another within the mineral structure. This phenomenon is critical in determining the stability and formation conditions of minerals, influencing everything from the color of gemstones to the properties of industrial minerals.In conclusion, the significance of substitutional (替代的) processes in material science cannot be overstated. Through the manipulation of atomic structures, scientists and engineers can develop innovative materials with tailored properties for a wide range of applications. Whether in metallurgy, electronics, or geology, the principles of substitutional (替代的) alloying and doping continue to drive advancements in technology and industry, showcasing the importance of understanding and leveraging this fundamental concept.