氮化的

In this paper, we used molecule dynamics simulation technique in researching dielectric property. By analyzing the information that is provided from molecule dynamics simulation, we can got some dielectric properties like dielectric constant and chargeability. Firstly, 3D model of silicon dioxide was been built and geometric optimization was been used to make the model more correctly. Then the model was been put in calculation of molecule dynamics simulation with a definitive temperature.

本文针对氮化硼晶体在极端高温下的介电性能开展研究，首先建立六方氮化硼晶体的微观结构模型，通过几何优化对其进行进一步的结构修正，然后选择合适的力场、系综、积分时间步长和压力温度控制方法，对微观结构模型进行某一温度下的分子动力学计算，动力学计算达到平衡后得到该温度下电介质材料的微观结构模型和动力学特性。

The fluffy film may fall off from Cf if the pretreat method of Cf suface was not appropriate. Boron sources was ahead loaded on the surface of Cf by in situ chemical reaction to protect the fiber from corrasion of vapor such as NH_3 and increase the combination between BN film and Cf. The measured surface area of the composite fiber increased greatly to

表面的氮化硼绒膜与碳纤维的结合程度，取决于碳纤维表面预处理的方式，先期在表面通过原位化学反应引入硼源物质，形成保护膜，可以避免碳纤维在整个反应过程中受到气相侵蚀而影响氮化硼绒膜与碳纤维的结合程度，该复合材料的比表面积大幅提高，达到96m~2／g。

The primary performances of nitrogen-rich compounds on the gas generant composition of automobile crash airbag system are studies. Based on the closed bomb tests, the P—t curves are obtained and compared with NaN〓. It is shown that the burning velocity of five compounds are higher than that of NaN〓.

研究了富氮化合物作为气体发生剂使用的基础性能，采用密闭爆发器法测出了它们燃烧过程的P-t曲线，并与常用的叠氮化钠类气体发生剂的性能进行了比较，结果表明其中5种药剂的燃烧速度优于叠氮化钠。

The ratio of nitridation increases as the temperature does and reaches the uppermost at 1:2.5 for the ratio of titania to carbon.

随着温度的升高，氮化率呈递增的趋势；而对于TiO_2／C的影响，本文发现TiO_2／C为1：2.5时系统的氮化率最高。

Using silicon and metallic iron,α-Si_3N_4 olivary microparticles with a diameter of about 300～500 nm have been obtained at 650℃.When silicon and metallic aluminium were used to react with ammonium chloride,α-Si_3N_4 nanowire bundles with diameter of about 8 nm can be also obtained at 600℃.Since all of the starting materials used are relatively cheap,the methods will have potential prospect in industrial application.3.Graphite-like carbon nitride nanowire bundles with diameters of 200-500 nm were synthesized from the solid state thermolysis of melamine at relatively low temperature(400℃).

相关研究工作的成果发表在International journal of applied ceramicstechnology.2、以廉价的硅铁合金和氯化铵为原料，在600℃合成了α相的氮化硅纳米线束，单根纳米线直径8 nm，长达800 nm，考察了反应温度和反应时间对产物纯度和形貌的影响；以硅粉和铁粉为原料合成了纯度良好，直径为150～500 nm的α-Si_3N_4亚微粒子；以硅粉和铝粉为原料在400-600℃合成了直径为10 nm左右的α相氮化硅纳米线束。

The properties such as high hardness,low friction coefficient,excellent wearability and photics properties,can provide the profound foundation for the application of carbon nitride materials in many fields.

许多研究小组已经合成出具有独特性能的氮化碳，其高硬度、低摩擦系数、良好的耐磨性、较好的光学性质等对氮化碳在广阔领域里的应用提供了坚实的基础。

The results of catalytic performance showed that chromium oxide has certain ammonia decomposition activity.

将氧化铬材料用于氨分解反应，发现氧化铬具有一定的氨解活性，在氨分解过程中，催化剂的组成发生了变化，氧化物部分氮化，氨解性能并没有明显的变化，表明氮化铬是氨解反应的活性中心。

When used in superabrasive grits synthesizing, especially in the case of cubic boron nitride, the consumption of anvils can be decreased effectively; and the quality and yield of CBN can he improved.

在超硬材料合成中，尤其是立方氮化硼合成中，能有效降低锤耗，同时可提高立方氮化硼的合成品质及产量；超硬材料表面镀钛及钛合金后，能实现镀层和结合剂的冶金结合，工具寿命提高30%以上；钛对许多氧化物质和还原物质具有极好的耐腐蚀性，适用于人造金刚石的批量电解提纯工序。

Under these conditions several aryl iodides bearing a wide range of functional groups were converted into the corresponding aryl azides in good yields.

在重新优化后的条件下，大部分不活泼芳基溴化物可以与叠氮化钠发生交叉偶联反应得到良好收率的芳基叠氮化合物，但是有拉电子基团取代的芳基溴化物与叠氮化钠的偶联反应则难以进行。

It has been well known that the activity of a BN particle might increase to a large extent when its size minished to several nanometers. As a result, the temperature and pressure required for the phase transformation will decrease accordingly.

氮化硼纳米颗粒的物相稳定性研究已有的研究结果表明：当氮化硼颗粒的粒度减小到纳米量级时，它的活性显著提高，发生物相转变所需要的温度和压力随之降低。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。