By changing the ratio of raw materials and template , we obtained macroporous sio2 materials with different diameters of porosity . when template content ( weight ratio ) is ca . 30 % , sem images showed that pore sizes were in the range of 160nm - 500nm with isolate porosities ; when template content ( weight ratio ) is 50 % - 60 % , pore sizes were in the range of 0 通过扫描电镜观察，孔径范围基本在大孔范围：当模板剂含量(重量比)为总量的30时，得到具有孤立的孔道结构，孔道间相互交叉较少，孔径大小在160nm - 500nm之间，平均墙厚度为600nm的大孔材料；当模板剂含量为50 - 60时，得到孔径大小在5 . 5 m 6 . 2 m之间，平均墙厚度为2 m ，具有交叉孔道结构的大孔材料。
The results showed that the traditional performance did not change by adding 2 - 3 % granularity of rare - eath and the readiation specification was in the safe scale by producing 800 - 1000 negative irons per cm3 , the diameter of anti - bacterial circle to golden staphylococcus is 18 millimeter , the diameter of anti - bacterial circle to colon bacil lus is 22 millimeter , the purifying formaldehyde ratio comes to 65 . 3 percent and the purifying ammonia - gas ratio comes to 52 . 11 percent 结果表明：加入重量比为2 ? 3的稀土细粉后，新型环保保健涂料的常规性能指标不变；其放射性亦在安全指标范围内，可产生800 - 1000个负离子/ cm ~ 3 ，对金黄色葡萄球菌的抑菌圈直径为18mm ，对大肠杆菌的抑菌圈直径为22mm ，具有较好的抑菌作用。
Parallel manipulator has been developed based on the parallel mechanism . compared with the traditional series - connected robot , the parallel manipulator has its movement platforms actuated in parallel by several simple series connected movements chains , therefore has stronger bearing capacity , better dynamic performance and bigger ratio of rigidity load , thus are becoming more and more attractive to researchers and manufacturers . it has also become a research hot point in the manufacturing industries 基于并联机构发展起来的并联机器人由于其运动平台由几个简单的串联运动链并行驱动，与传统的串联机器人相比，具有承载能力强、动态性能好、刚度重量比大等优点，并因为这些优点而日益受到广大学者及制造商的重视，现在正在成为制造领域的一个研究热点。
Pmt enjoy following advantages over traditional five - coordinates nc machine tools : high stiffness weight ratio , high feed speed , high environmental suitability , high additional technology value etc . but it also has shortcomings such as small workspace , limited area for backhaul movement , complex of moving control and difficult for precision compensation 与传统机床相比,并联机床具有刚度重量比大、响应速度快、环境适应性强和技术附加值高等优点,但它又同时有运动范围(工作空间)小的缺点,特别是回程运动范围有限,驱动控制复杂和难以进行准确的精度补偿。
In mpe / lldpe ( ldpe ) blends when lldpe ( ldpe ) content varies from 20 % to 80 % ( weight fraction ) , tear strength and puncture of remain almost constant ; smpe / lldpe film ' s puncture strength changes slowly too . considering dsc analysis , it can be verified that the co - crystallization between ingredients affects tear strength and puncture strength greatly . 2 Mpe中加入lldpe或ldpe在后者含量为20 - 80 (重量比)时，撕裂强度和穿刺强度没有明显变化； smpe lldpe薄膜穿刺强度的变化也很平缓，结合dsc分析，证明组分之间形成的共晶结构对薄膜的撕裂强度和穿刺强度影响很大。
Composite structures have become increasingly popular as a replacement for metallic parts , particularly in high performance applications such as in the aircraft industry , because of the high strength to weight ratio , good corrosion resistance , good impact resistance , and thermal resistance exhibited by composite parts 由于纤维增强塑料具有高的强量重量比、好的抗腐蚀抗、抗冲击性能和零件的阻热性等，在航空、航天工业等一些尖端技术中，金属构件已经逐渐地被纤维增强塑料构件所替换。
In addition , instead of portal brake of j93 - 1000b model , the brake device of j93 - 1000c changes into rushing board brake , thus the dependability of braking is consumedly advanced , being convenient to adjust , and the rigidity strengthening of plate design reduces the vibration noises during the working of press . with cast steel as the material of slide , slide weight of j93 - 1000c model is increased 1 thousand kgs than j93 - 1000b model with nodular cast iron as material . plus that the width from front and back of frame upright post of j93 - 1000b model is 750mm , while its 1000mm for j53 - 1000c model , increasing 250mm than the former J93 - 1000c螺杆螺母螺旋副使用寿命及螺杆的刚度也增加刹车装置由原j93 - 1000b型门刹车改为j93 - 1000c推板式刹车，制动可靠性大大提高，而且便于调整，平台设计刚度增强降低了压力机工作中的振动噪声j93 - 1000c型滑块支背材质铸钢j93 - 1000b型的为球墨铸铁而且j93 - 1000c型滑块重量比j93 - 1000b型增加1000公斤， j93 - 1000c型机架立柱前后宽1000毫米比j93 - 1000b型机架立柱前后宽750毫米增加250毫米， j93 - 1000c机身重46 . 8吨， j93 - 1000b整体机身重38 . 5吨。
Ldneinallcs , wiectory pltw for obstacle avodance , and intelligen contidl systein of macrowhcro mpatd pe be on vahable - - truss are the forly and pe in this diwton . by tw the am dris netal netwoik ( w , the proper bo nd - th for wrgt ~ ators is ds . based on the cn ' n , the fotw poanon pioblem of m wtwt variabe geotw to rugd is tiaind by use of the tw function 变几何桁架机构有十分好的刚度重量比，理论上每个构件都是二力杆，不传递弯矩和扭矩，并可设计为可折叠的机构，变几何桁架机器人机构比串联型机器人机构有更好的刚度，这些特性使得变几何桁架机构具有广阔的应用前景。
In addition , instead of portal brake of j53 - 1000b model , the brake device of j53 - 1000c altered into rushing board brake , thus the dependability of braking is consumedly advanced , being convenient to adjust , and the rigidity strengthening of plate design reduces the vibration noise during the working of press . with cast steel as material of slide , slide weight of j53 - 1000c model is increased 1 thousand kgs than j53 - 1000b model with nodular cast iron as material . plus that the width from front and back of frame upright post of j53 - 1000b model is 750mm , while its 1000mm for j53 - 1000c model , increasing 250mm than the former J53 - 1000c螺杆螺母螺旋副使用寿命及螺杆的刚度也增加刹车装置由原j53 - 1000b型门刹车改为j53 - 1000c推板式刹车，制动可靠性大大提高，而且便于调整，平台设计刚度增强降低了压力机工作中的振动噪声j53 - 1000c型滑块支背材质铸钢j53 - 1000b型的为球墨铸铁而且j53 - 1000c型滑块重量比j53 - 1000b型增加1000公斤， j53 - 1000c型机架立柱前后宽1000毫米比j53 - 1000b型机架立柱前后宽750毫米增加250毫米， j53 - 1000c机身重46 . 8吨， j53 - 1000b整体机身重38 . 5吨。
While still not evidenced in our experiment , liquid - phase doping of ammonium molybdate solution has been broadly agreed to be able to significantly increase the yield of swnts . we have developed another doping method , solid - phase doping of metal molybdenum at elevated temperature , and discovered that sol - gel prepared catalyst with such doping can be used to grow multi - wall carbon nanotube bundles in a very large scale 对催化剂进行掺钼处理表明，它可显著提高催化剂催化裂解甲烷合成纳米碳管的能力：作者在高温下进行了催化剂掺入金属钼的实验，得到了一种性能优异的催化剂，以此制备的多壁纳米碳管的呈束状分布，所得的粗产物与催化剂之间的重量比达15倍以上。
