查询词典 hydrogen fluoride

Of all the hydrogen storage alloys studied previously, AB~5-type mischmetal- based hydrogen storage alloy is used most widely.

在多种贮氢合金中，AB~5型稀土系贮氢合金的应用最为广泛。

In order to find screening rules suitable for lead compounds of pesticide,five descriptors:logarithm of partition coefficient of octanol/water,relative molar weight,number of hydrogen-bond donors,number of hydrogen-bond acceptors,polar surface areaand carcinogenic and mutagenic toxicities of 242 fungicides,512 herbicides and 399 insecticides were calculated and analyzed.

为了寻找适合于农药的先导筛选规则，对242个杀菌剂、512个除草剂和399个杀虫剂的5个描述符：疏水常数、相对分子质量、氢键给体数、氢键受体数、分子极性表面积和毒性进行了计算和分析，提出了杀菌剂、除草剂和杀虫剂先导化合物的筛选规则。

In order to find screening rules suitable for lead compounds of pesticide,five descriptors:logarithm of partition coefficient of octanol/water,relative molar weight,number of hydrogen-bond donors,number of hydrogen-bond acceptors,polar surface areaand carcinogenic and mutagenic toxicities of 242 fungicides,512 herbicides and 399 insecticides were calculated and analyzed.

1996年，Lipinski通过对2000多种口服药物进行分析，提出了用于药物分子筛选的&5规则&，即化合物疏水常数(CLogP≤5或MLogP≤4.5)，相对分子质量不大于500，氢键给体数不大于5和氢键受体数不大于10[1]。2003年，Andrew等报道了从高通量筛选结果中获取先导化合物的规则：化合物疏水常数≤3，相对分子质量小于450[2]。

Hydrogen always has valence 1, so other elements' valences equal the number of hydrogen atom s they combine with.

元素的特征价数是以该元素一个原子可结合的氢原子数或可从一化合物中置换出的氢原子数来表示。

The mainly conclusions in our research are as flowing: tungsten trioxide powders with 100 nm primary particle are obtained by spray drying,calcination and wet milling process, and an average size of quadric particle composed of agglomerated particles is 0.64 μm; tungtsen powders with 39 nm grain size and 60 -100 nm primary particle are produced directly from previous tungsten trioxide using one step reduction in hydrogen at 700℃, and an average size of quadric particle of tungsten powder is 2.91 μm; tungsten trioxide and copper tungstate compound powders with 100 nm - 200 nm primary particle are produced using ammonia metatungsten and copper nitrate as raw materials by spray drying,calcination and wet milling process;the compound powders are transformed completely into tungsten and copper compound powders by reduction in hydrogen at 700℃,in which tungsten grain size is 59 nm and copper grain size is 51 nm; primary particle size of compound powders is 80 - 120 nm,and an average size of agglomerated quadric particle is 1.86 μm; tungsten nitride powders with 35 nm grain size are prepared from tungsten trioxide powders by nitrogen treatment thoroughly in pure ammonia at 650℃, and an average size of agglomerated quadric particle is 0.64 μm in normal temperature.

研究结果表明：采用喷雾干燥—焙烧—球磨工艺可以制备出粒度约为100nm的WO_3粉体，它们在团聚后形成的二次颗粒平均粒度为0.64μm；采用一步直接氢还原方法可在700℃下从上述WO_3粉体制备出晶粒尺寸为39nm的、一次颗粒粒度为60-100nm的W粉体，其二次颗粒的平均粒度为2.91μm；以偏钨酸铵、硝酸铜为原料，采用喷雾干燥—焙烧—球磨工艺可制备出一次粒度为100-200nm的WO_3和CuWO_4混合粉体；采用氢还原工艺可在700℃下将这种粉体完全转变为W、Cu复合粉体，其中W的平均晶粒粒尺寸为59nm，Cu的平均晶粒尺寸为51nm；复合粉体的一次颗粒尺寸为80-120nm，在常温下团聚后形成的二次平均粒度为1.86μm；采用纯氨氮化工艺可以在650℃下由WO_3粉体制得WN，其晶粒尺度为35nm，在常温下团聚后的二次平均粒度为6.4μm。

The most effective way to solve these problems is on-board hydrogen generation by liquid fuels with high hydrogen density.

解决这些问题的最有效的方法是选择合适的具有高能量密度的液体燃料催化转化在线产氢。

The hydrogen solubility in Pd follows Sieverts law, and hydrogen diffusion through the bulk of the palladium membrane is the rate determining step. Whereas other gases only permeate through the pinholes or gaps in the Pd layer;the permeation can be quantitatively described as a combination of Knudsen diffusion and viscous flow.

氢气在钯膜中溶解渗透服从Sievert定律，并且氢的渗透扩散过程是速率控制步骤；而其他气体则通过膜中的针孔或裂隙进行扩散，其传质过程为Knudsen扩散和粘性流两种传递方式的综和。

Interconersion between these two forms of energy suggests on-site utilization of hydrogen to generate electricity, with the electrical power grid sering in energy transportation, distribution utilization, and hydrogen regeneration as needed.

以氢气作能源可以缓解空气污染，地球变暖得到控制，环境以可持续发展的方式得到保护。氢气可以和电能偶连起来，为交通运输及发电提供能源。

For the fourth part, we first designed a hydrogen bonding-mediated rigidified polymer. The X-ray crystal analysis of its fragment molecules showed the existence of consecutive intramolecular hydrogen bonds, which forced the backbone to adopt a rigidified planar conformation.

在第四部分工作中，首先我们设计了一种分子内氢键控制构象的聚合物，通过对其氢键骨架的单晶培养和结构解析证实在它们的结构中存在三中心氢键使得它们采取平面刚性的构象。

Reforming unit: recycle hydrogen compressor, reforming hydrogen compressor, feedstock furnace, reboiling furnace of deheptane tower

重整单元：循环氢压缩机、重整氢增压机、重整进料加热炉、脱戊烷塔重沸炉

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。