查询词典 diamond boron

The method on trans fatty acids analysis in food is very important. The effects of methylate sodium, potassium hydroxide, sulfuric acid and boron trifluoride in methanol and their different concentration and dosage on TFA analysis were studied. The chromatographic condition and the influence of time and temperature on the esterifation of TFA using boron trifluoride in methanol were optimized. A method for analyzing TFA were established by GC based on boron trifluoride in methanol and RT-2560(100m×0.25mm×0.2μm) capillary column.

研究了甲醇钠－甲醇、氢氧化钾－甲醇、浓硫酸－甲醇和三氟化硼－甲醇4种甲酯化试剂的浓度、用量及甲酯化时间和温度对反式脂肪酸检测的影响，优化了色谱条件，建立了以三氟化硼－甲醇法甲酯化，RT-2560(100m×0.25mm×0.2μm)毛细管柱为基础的反式脂肪酸气相色谱检测方法，C18：1-9 t， C18：1-11 t， C18：2-9 t， 12 t和C22：1-13 t 4种反式脂肪酸的最小检出浓度在0.774.08 mg/kg之间。4种反式脂肪酸不同添标浓度回收率为98.44%101.23%，重复测定的相对标准差在0.22%1.31%之间，有较好的准确度和重现性。

The company produces boron trifluoride acetonitrile and family of products based on technology Zhejiang Huangyan chemical synthesis, the plant is the first production of boron trifluoride etherate, one of the manufacturers, with thirty years of history, there is a group engaged in research boron trifluoride and a group of experts with practical experience of staff.

本公司生产三氟化硼乙腈及系列产品的技术主要依托浙江黄岩合成化工厂，该厂是全国最早生产三氟化硼乙醚的厂家之一，具有三十多年的历史，有一批从事研究三氟化硼的专家和一批具有实际操作经验的工作人员。

Research progresses in the oganoboron π-conjugated materials are reviewed in this paper, in terms of the molecular structures of the π-conjugated systems, including the linear π-conjugated systems with boryl groups at the terminal positions, the starburst π-conjugated systems containing boron atoms at the center, the polymeric π-conjugated systems containing boron atoms in the main chain, the boron-bridged ring-fused π-conjugated systems, as well as the π-conjugated systems with boryl groups at the side positions.

本文根据π-共轭体系分子结构的不同，对有机硼π-共轭材料，包括硼取代基位于末端的线形π-共轭体系、硼原子位于中心的星形π-共轭体系、硼原子位于主链的π-共轭聚合物体系、硼原子桥联的并环π-共轭体系以及硼取代基位于侧链的π-共轭体系等的研究进展进行了综述，并进一步对该领域的发展前景进行展望。

The organoboron compounds in this paper are based on triarylboranes, boronic acids and boronic esters. The structure-property relationship and sensing mechanism are elucidated. Organoboron compounds as Lewis acid can be used as fluoride probe with high sensitivity and selectivity because they have a unique LUMO in which the π-conjugation is divergently extended through the vacant p-orbital of the boron atom. The complexation of the boron π-electron systems with fluoride ion would interrupt the π-conjugation extended through the boron atom, causing the change of photophysical properties.

介绍了基于三芳基硼化合物、硼酸和硼酸酯的有机硼化合物在氟离子检测中的应用，评述了这些化合物的结构和检测性能之间的关系，讨论了检测机理，即有机硼化合物中硼原子空的p轨道使其作为路易斯酸能够选择性地结合氟离子，硼原子与氟离子的结合破坏了硼中心与芳香取代基的p-π共轭，引起有机硼化合物光物理性质的变化，从而实现对氟离子的高选择性检测。

It was found in this investigation that boron exerted considerable influenceon the nucleation and growth of pearlite. In a hypoeutectoid steel, boron delayedthe starting time of pearlite formation at the maximum pearlite formation temp-erature. Boron did not effect the relation of nucleation rate with time butonly increased the incubation period for pearlite nucleation.

从实验结果证明，硼对珠光体的成核及成长是有影响的；在亚共析钢中硼促使珠光体的开始形成时间推迟，增长了珠光体成核的孕育期，但对成核率与时间的关系，在近于A_1温度(700℃)时，略为加速，而在珠光体转变速度最大的温度(650℃)时却没有影响。

Through designing of composition and structure of the bioactive graded coating,innerstress and its distribution in the coating were analyzed and calculated, the resultsshowed that when composition distribution coefficient n was 1.5, a reasonable stressdistribution could be got, that was at the beginning of deposition the suspension containingrichly BG granules was used so that a rich BG granules layer, a good transitional layerbetween BG layer at the bottom and the coating could be obtained at the titanium alloy side,the bottom of the coating; the stress value near the interface and surface and its character,pressure stress or tensile stress, were decided by the character of its composition itself.Changing composition distribution coefficient n could only change the variation tendency ofstress in the coating, but did not change the stress distribution rule in the coating. Thethinner the coating is, the sharper stress variation in the coating is, which does not mean thatthicker coating is better because the thicker the coating is, the little the permitteddeformation of coating is, so the coating thickness should be thinner, for example, about50μm for bending applications, but for applications only bearing pure shear stress, such asroot of tooth implant, the coating can be thicker little, for instance, about 80～100μm. The study on electrification characteristic and electrophoresis deposition of HAand BG granules in aqueous and non-aqueous solution system found that EPD almost didn'toccur in aqueous solution system. However, because HA granules take position charges inabsolute alcohol, a homogeneous EPD be carried out on the cathode titanium alloy slice, but taking negative charge in absolute alcohol the BG granules not be deposited on the cathode. A guided HA crystallizing, 100～300nm, on surface of the BG granules be realized by metathetical reaction, which cover BG granules with HA microcrystals and make the covered BG granules taking position charges in absolute alcohol, sequentially realize the EPCD of the BG and HA granules on the cathode, so it is feasible to make a titanium alloy/BG/HA bioactive graded coating by making use of EPCD technology. The corrosion experiment of rich boron bioglass coating and plasma spray coating showed that split phase, rich boron and rich silicon phase, occurred during its preparation. In basic medium the corrosion behavior of 〓 BG coating showed uniformity corrosion, the corrosion mostly occurred at rich boron phase area, therefore batch formula design of BGshould avoid the occurring of split phase. The corrosion appearance of plasma spray coatingappeared a non-uniform corrosion, mostly occurred at the edge of the laminated HA moltendrops, and emerged an accelerated corrosion tendency, which will easyly lead to corrosioncrackles extending to the interface and the happening of osmotic interfacial corrosion, thatmay be one of the major reasons leading to the coating cracking-off in the later period. Thetesting results of thermal expansion coefficient of 〓 and 〓BG showed the thermalexpansion coefficient of 〓 BG matched with that of titanium alloy better, and 〓 BG couldsinter with titanium alloy into densification enamel layer at low temperature (720℃).

将Ti6Al4V合金在1000℃下进行真空热处理会降低其力学性能，且合金内的V元素会向表面富集，因此，钛合金真空热处理和表面涂层的烧结温度不能过高，即应低于其相转变点；通过对生物活性梯度涂层的组成和结构的设计，分析和计算了梯度涂层内的应力大小和分布，结果表明：对于本研究，当成分分布系数n=1.5时，可以获得较合理的涂层力学性能，即在沉积开始时，采用富含BG颗粒的悬浮液，以便在钛合金侧获得同底层BG有良好过渡的富BG涂层；梯度涂层界面和表面的应力大小、性质由材料组成本身的性质决定，改变成分分布系数，只能改变涂层内应力变化的趋势；涂层的厚薄不影响涂层内的应力分布规律，但涂层越薄，涂层内的应力变化越快，但这并不意味着涂层越厚越好，因为涂层越厚，涂层允许的变形越小，对于应用于弯曲受力部位的涂层而言，涂层应薄一点为好(50μm)；而对于仅纯受剪切应力的部位，如牙根种植体，涂层可适当加厚(80～100μm)；通过对HA和BG颗粒在水溶液体系和非水溶液体系中的带电特性和电泳沉积的研究发现，它们在水溶液体系中很难发生电沉积；在无水乙醇溶液中，HA颗粒带正电，可在阴极钛合金片上发生均匀的电泳沉积，而BG颗粒则带负电荷；利用复分解反应法，可以制得100～300nm的HA，通过诱导HA在BG颗粒表面结晶，可对BG颗粒进行表面包覆，获得了被HA包覆的BG颗粒，改变了BG颗粒表面的带电特性，使BG和HA颗粒在无水乙醇中均带上正电荷，从而实现了HA和BG颗粒在阴极上的共沉积。

Our company specializes in producing: cubic boron nitride grinding wheel; resin grinding wheel; CBN resin grinding wheel; plating wheel; bronze wheel; ceramic grinding wheel; micro-grinding wheel study; cylindrical grinding wheel; diamond polishing paste; diamond grinding head models of various specifications of diamond wheel.

本公司专业生产：立方氮化硼砂轮；树脂砂轮；CBN树脂砂轮；电镀砂轮；青铜砂轮；陶瓷砂轮；微钻研磨砂轮；外圆研磨砂轮；金刚石研磨膏；金刚石磨头等各种规格型号的金刚石砂轮。

Diamonds are the hardest natural material. Only a diamond can cut another diamond. So diamond cutters use diamond dust on a device called a polisher's wheel.

钻石是自然界最坚硬的物质，只有用钻石才能切割钻石，所以，钻石切割机是将钻石沙放在一种叫磨光器的轮子上。

The lattice relaxation in the CVD diamond thick films were detected by the X-ray diffraction attachments. It is associated with self-annealing of diamond thick films in the process of long time deposition. The wearing discrepancy of diamond coated cuttings and diamond thick films brazed cuttings is well illustrated by means of lattice relaxation.

用X射线衍射仪的薄膜附件测试分析金刚石厚膜内的晶格松弛现象，发现沉积金刚石厚膜过程中存在高温自退火的作用，运用晶格松弛的观点很好地解释了金刚石薄膜涂层刀具与厚膜钎焊刀具的耐磨性能差异。

The research results showed that resin bond could hold the self-sharpening diamond more tightly than ordinary diamond, for CSD diamonds have irregular shape, rough surfaces and many incurvated angle. Under the condition of the same grinding efficiency, the grinding ratio of resin bond grinding wheels made with self-sharpening diamond was 1.6 times as high as that of the grinding wheels made with ordinary diamond.

试验结果表明，由于CSD形状不规则，有许多凹入角和粗糙表面，树脂结合剂对CSD的把持力较普通金刚石强，所以在磨削各参数相同的条件下，自锐性金刚石砂轮与普通金刚石砂轮相比，其磨削比提高60%以上。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了