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The research results show for low Sn concentrations, for example 1wt%Sn with respect to Ni, the Ni/Sn surface alloy is energetically preferred. We have also used XPS to characterize the catalysts. The quantified Sn and Ni XP spectra for Ni/Sn/SLT catalysts show that Sn preferentially segregates to the surface of the Ni/Sn alloy. We demonstrate that supported Ni/Sn alloy catalyst provides significantly higher reforming reactivity and resistance to deactivation via carbon deposition than supported monometallic Ni catalyst both in steam reforming of CH4 and CO_2 dry reforming.

本文以SLT为支撑体，利用Sn对传统的Ni基催化剂进行表面合金化处理，成功制备了Ni/Sn表面合金重整催化剂，将该催化剂用于甲烷和丙烷的CO_2重整和水蒸汽重整反应，研究结果表明，在Sn浓度很低的情况下，例如1wt%Sn含量，从能量角度看更易于形成表面合金，XPS数据也显示Sn更易于富集在Ni/Sn合金催化剂表面。

Apparently his design was seen as having merit for he was given a grant of 2 500 Imperial Russian rubles a considerable sum of money with which he was to build his steam powered monoplane .

显然，他的设计被看作是具有优异，他获得了补助金2500帝国俄罗斯卢布与他建立他的蒸汽动力单翼。

Stringfellow built his own flying machine in 1868 also, a steam powered twin-propeller tandem-winged monoplane, and it too was displayed at the Crystal Palace.

stringfellow建立了他自己的飞行机器是在1868年还，蒸汽驱动的双螺旋桨串联翼单翼，它也被张贴在水晶宫。

The sesquiplane (a monoplane with additional half-wings) was meant to be powered by a steam engine mounted inside the rounded body of the machine.

这架翼半式飞机依靠安装在机体圆形装置内的蒸汽机提供动力。

The Aerial Steam Carriage was also the first recognizably "modern" monoplane design, with a three-wheeled landing gear, and powered by two contra-rotating six-bladed propellers.

空中蒸汽运输，也是第一recognizably "现代"单翼设计，与3轮式起落架，由两个魂斗罗-旋转6 -刀刃螺旋桨。

"Moony" creates a mystic space by using a steam screens with organic variations and interactive butterfly images.

梦影蝶》通过使用蒸气屏幕，配合有机变化和互动的蝴蝶图像创建了一个神秘空间。

For many years the motive power of trains was steam.

"好多年，火车的动力是蒸汽。"

High temperature gas scour,alkalescent steam attack,and thermal shock will cause the flush corrosion,silica brick corrosion,mousehole,crack and flake of crown.

生产过程中的侵蚀损毁和烤窑维修过程中的人为损害是影响玻璃池窑碹顶安全的主要因素。

The present invention adopts the technical proposal of adopting ZSM-5 mesoporous molecular sieve raw powder with a silicon-aluminum mol ratio SiO2Al2O3 of 20 to 1000 and a weight percentage of 20 to 100 percent as well as at least one caking agent selected from SiO2, clay and Al2O3 to extrude, tablet or spray into shape; then treating for 1 to 8 hours by 0.1 to 3 mol/l of at least one ammonium liquor from ammonium nitrate, ammonium chloride or ammonium sulphate or 0.1 to 8.5 mol/l of at least one acid liquor from muriatic acid, nitric acid, vitriol or acetic acid under a temperature of 20 to 90 DEG C; then using steam to treat for 2 to 15 hours under the temperature condition of 400 to 700 DEG C; using a liquor of 0.1 to 3mol/l selected from at least one of oxalic acid, citric acid or maleic acid under a temperature condition of 20 to 90 DEG C to dip for 2 to 5 hours to obtain the modified molecular sieve catalyst, thus better solving the problems.

本发明通过采用硅铝比SiO2/Al2O3为20～1000重量百分比计20～100％的ZSM-5介孔分子筛原粉与余量的选自SiO2、粘土或Al2O3中至少一种粘结剂挤条、压片或喷球成型；再经过0.1～3摩尔/升选自硝酸铵、氯化铵或硫酸铵中的至少一种铵溶液或0.1～8.5摩尔/升选自盐酸、硝酸、硫酸或乙酸中的至少一种酸溶液在温度20～90℃下处理1～8小时；然后在温度为400～700℃条件下水蒸汽处理2～15小时；再用0.1～3摩尔/升选自草酸、柠檬酸或马来酸中至少一种在温度为20～90℃条件下浸渍2～5小时得所需改性分子筛催化剂的技术方案较好地解决了该问题，可用于甲醇转化制丙烯的工业生产中。

A method for predicting product-yields of naphtha steam cracking was established by means of BP neural network model.

目前，工业上生产乙烯的主要方法是在管式裂解炉中采用热裂解法。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。