熔点

It is found that the melting points of borides of IVB and VB group elements are higher than their simples. It is because their hybridization levels are higher, and their single bond radius are shorter.

发现IVB，VB族元素的硼化物熔点都比相应的单质有较大提高，原因是组成元素的杂阶升高，单键半距随杂阶升高而逐渐下降。

Transition metal borides and inorganic boron-containing compounds, such as TiB〓, BN, B〓C and BP, are one of the most important groups for application in high-temperature performance, electronics and catalysts. Traditionally, they were prepared by high-temperature reactions; however, the products were beyond nanometer scale.

中文题名溶剂热合成硼化物及非金属含硼化合物纳米材料副题名外文题名论文作者谷云乐导师钱逸泰学科专业无机化学研究领域\研究方向学位级别博士学位授予单位中国科学技术大学学位授予日期2003 论文页码总数70页关键词纳米材料硼化物溶剂热合成馆藏号BSLW /2003 /O613 /6 硼化物、非金属含硼化合物功能材料（如硼化钛、氮化硼、碳化硼和磷化硼等）通常具有高硬度、高熔点、机械强度大、高温化学稳定性好等一系列优良性能，有些还具有奇异的光、电、磁、热学性能和催化活性，是一类最富潜力的非氧化物高温结构材料、电子材料和催化材料。

Latest researches in the catalysts for synthesis of carbamate by ammonolysis of dimethyl carbonate;2. Progress in the catalysts for synthesis of carbamates by ammonolysis of dimethyl carbonate;3.4,4′-Methylene diphenyl carbamatewas synthesized by ammonolysis of dimethyl carbonate, a substitute of phosgene, and 4,4′-diaminodiphenyl methane with anhydrous zinc acetate as catalyst.

用碳酸二甲酯代替光气，以4，4′-二氨基二苯基甲烷为原料，在无水醋酸锌催化剂的作用下，经胺解反应合成了4，4′-二苯甲烷二氨基甲酸甲酯；测定了MDC的熔点；采用傅里叶变换红外光谱和氢核磁共振对产品结构进行了表征；考察了反应温度、DMC用量、反应压力、反应时间、催化剂用量对MDC收率的影响。

Frictional experiments using a self-designed "multifunction servo friction and abrasion experiment machine" with the multi-parameter synchronous data collection system and online data processing software have been made on six types of rocks. The analyses of the experiments results indicate that earthquake faults with large displacement bring up a series of products continually changing from cataclasis to melting. The rocks contained mafic minerals are easier to melt and the gas bubbles in melting products proved the hydroxy water from the minerals has participated the rock melting process and decreased the melting point of the rock. Frictional melting is more sensitive to speed than normal stress. The temperature sharply increases at about 40℃/sec when the sample enters the earthquake fault state. While the melting happens, torsion decreases instantly and there is perhaps a "blind region" of normal stress.

利用自行设计加工的&多功能伺服摩擦磨损实验机&，及多参数同步数据采集系统和联机数据处理软件，对六类岩石进行的实验和分析成果表明：大位移地震断层作用形成了与滑动速率有关的从碎裂到熔融连续变化的系列产物；含镁铁质矿物的岩石更容易熔融，熔融产物中出现的气泡证实了矿物羟基水很可能参与了岩石的熔融过程并降低岩石熔点；相对于正应力而言摩擦熔融程度对速度变化更加敏感；此外，进入地震断层状态时温度急剧上升达～40℃/秒；伴随熔融发生出现扭矩骤减时，可能存在一个短暂的正应力&盲区&。

The research of convectors final slag properties indicates that, the content of MgO in final slag, in top blown, is lower than that in bottom blown, and the content of TFe in former is higher than that in latter, and as the content of MgO in slag increased, the melting point of slag increase, significantly.

转炉终渣性能分析研究表明，顶吹终渣MgO的含量比复吹终渣含量低，顶吹终渣中的TFe含量比复吹终渣的含量高；随着渣中MgO含量的增加，渣的熔点显著增大。

But, with the bath face of overheat, can take away facial skin fat too much on one hand, make facial skin lacks flexibility, flabby and little moist; The exudation that can stimulate facial skin fat more on the other hand (the melting point of leather fat makes an appointment with 30 Celsius, the skin is lukewarm every rise 1 Celsius, leather fat is secreted rise 10%).

但是，用过热的水洗脸，一方面会过多地带走面部皮脂，使面部皮肤缺乏弹性，松弛而少润泽；另一方面更会刺激面部皮脂的分泌（皮脂的熔点约30摄氏度，皮温每上升1摄氏度，皮脂分泌就上升10%）。

In the BPW,a brazing filler metal,which has high melting point and is able to dissolve the base metal significantly,is placed between the faying surface to be joined,the assembly is heated with high frequency induction heating,and a high uniaxial pressure is applied to discharge the molten interlayer ...

BPW新工艺以熔点较高并能显著溶解母材的钎料为中间层，利用感应电源加热并施加较大的压力，挤出液态中间层及氧化膜等形成的夹杂物，最终在焊接面周边形成圆滑过渡的钎角，同时，在界面处实现洁净母材之间直接接触的固相压力焊接合。

To avoid loss of drilling tools and even well abandonment due to downhole fire or explosion during air drilling in pay zones, we developed a novel downhole fire or explosion prevention sub, a kind of downhole tool made of low melting-point alloy, designed to shield off oxygen so as to put out fires. This sub is connected to the upper part of dill bit.

为了解决空气钻井在钻遇油气层时，发生井下燃爆，造成埋钻具、井眼报废等复杂情况，基于阻断氧气使火熄灭的思路研制出了一种低熔点合金制造的井下工具－空气钻井燃爆灭火阀。

To avoid loss of drilling tools and even well abandonment due to downhole fire or explosion during air drilling in pay zones, we developed a novel downhole fire or explosion prevention sub, a kind of downhole tool made of low meltingpoint alloy, designed to shield off oxygen so as to put out fires. This sub is connected to the upper part of dill bit.

为了解决空气钻井在钻遇油气层时，发生井下燃爆，造成埋钻具、井眼报废等复杂情况，基于阻断氧气使火熄灭的思路研制出了一种低熔点合金制造的井下工具--空气钻井燃爆灭火阀。

Our main dealing area is air conditioning refrigeration/cutting tools/ hard alloy tool/ diamond cutting tool/saw/ metal vlexible hose/ healthy body equipment/medical equipment/fishing equipment/bicycle/ metal furniture/ large-scale petroleum drilling/fire prevention and so on.

我公司生产的控温低熔合金有着独特的产品质量与良好的社会口碑，品牌控温低熔点合金钎料在广大的客户群中产生了巨大的影响与波动！斯耐特品牌已经在广大客户心中留下了深刻的印象。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失