不磨的

In the production of low chrome cast iron grinding ball, there has been existing lower longevity and instability properties.

在低铬铸铁磨球生产上，一直存在磨球介质的使用寿命不高，性能不稳定。

In different grinding stage, the grind-aid effect of different type of surfactants is not identical.

不同类助磨剂在不同粉磨阶段作用效果不一，因此不同的助磨剂表征方法不同。

Centerless grinding is a important way of processing in industrial production,the traditional grinding parameters are determined through the technology handbook and own actual processing experience,choice quality depends largely on the level of technology staff,so that the choice of parameters can not achieve the best.

无心磨削是工业生产中一种重要的加工方式，传统的磨削参数都是由磨削工艺人员通过查询相关的工艺手册并结合自身的实际加工经验选择确定，选择的好坏在很大程度上取决于工艺人员的水平，因此磨削参数不能达到最佳。

The sort and reason of grinding burn were analyzed. Based on the characteristic of the coned shape grinding wheel, the fac-tors of affecting the depth of the thermal damage layer were found.

锥面砂轮磨齿机工作时，由于工件受热和冷却、膨胀和收缩等不均匀性及磨削过程中各种变化因素的作用，极易产生磨削裂纹和烧伤。

The biomechanical tests showed that two kinds of artificial bones had not significant difference on compressive strength and Young\'s modulus(P＞0.05),while the flexural strength of nano-nacre artificial bone was less than the control group(P＜0.05).3.The results of CCK-8 showed that the difference were not significant in each group,the proliferation of osteoblast reached the peak at the 5th day;7 days after being co-cultured,the total protein content of study group was higher than control group and blank group(P＜0.05),while the difference between control group and blank group was not significantP＞0.05The difference of alkaline phosphatase activities among three groups was not significant(P＞0.05The SEM view showed that osteoblast attached and grew well in two kinds of artificial bone.4.X-ray photography showed that two kinds of powder started to degrade in 2 weeks;this phenomenon became more appear in 4 weeks,nano-nacre powder degraded faster than micron-nacre powder,while the hole shadow was easy to be found;in 8 weeks,all the femoral holes recovered and returned to normal bone mineral density in all groups.Analysis of tetracycline fluorescent double marks in the hard tissue grinding slices indicated that new bone grew fastest around the bone defect area in study group,while most slowly in blank groupP＜0.05 SEM(scanning electron microscope observation showed that nano-nacre powder degraded more quickly.The same result can be found through the demineralized sections morphometric analysis,and both of the composite artificial bones made from those two kinds of nacre powder had the good connection with the adjacent tissue in rats body without apparent inflammatory response.5.X-ray photography showed that rabbit\'s bone defects healed faster in study group since NNAB implanted than in control group since MNAB implanted.At 24 weeks after operation,bone density in radial defects had nearly accessed to the normal area,while lower in control group,and turned up nonunion in blank group;The checking of BMD showed that results in study group were higher than those in control group at 8,16 and 24 week(P＜0.05), and the difference between the BMD values in study group at 24 week and those in blank group was not significant(P＞0.05).The gross specimens showed satisfactory histocompatibility both in study group and in control group,with bone tissue growing from two sides into the center of implanted materials; Normal slices in HE stain and hard tissue grinding slices in Stevenel\'s blue/Van Geison\'s picro-fuchsin stain showed that the bone growth tendency was better in study group than that in control group,and the medullary cavity had been penetrated to the implanted materials in study group at 24 week;Analysis of tetracycline fluorescent double marks in the hard tissue grinding slices indicated that new bone in both groups grew fastest 8 weeks after surgery,while slow down at 16 week.

纳米珍珠层/消旋聚乳酸复合人工骨与微米珍珠层/消旋聚乳酸复合人工骨分别与成骨细胞共培养后，其各时间点CCK-8法检测值与空白对照无显著差异(P＞0.05)，成骨细胞均在第5天达到增殖高峰期；培养7天后，实验组细胞蛋白含量高于对照组及空白组(P＜0.05)，后两者之间则无显著差异P＞0.05碱性磷酸酶活性在三组间均无显著差异(P＞0.05电镜下可见成骨细胞在两种人工骨上都有良好生长贴附能力。4.X-ray显示两种粉体在大鼠股骨骨洞植入第2周时都开始出现了降解，第4周时更为明显，纳米珍珠层粉较之微米珍珠层粉降解更快，而空白对照组骨洞阴影仍可见，至8周时，则所有组骨洞均己闭合修复，X-ray下已不可见原钻孔痕迹，恢复正常骨质密度；硬组织磨片四环素荧光双标记结果显示纳米珍珠层粉植入组较其余两组在骨缺损区周围新骨生长速度更快，空白组速度最慢P＜0.05电镜观察及常规脱钙切片亦可见到纳米粉体降解较快；由以上两种原材料制得的纳米珍珠层/消旋聚乳酸复合人工骨与微米珍珠层/消旋聚乳酸复合人工骨在大鼠体内均与周围组织结合良好，无明显炎症反应。5.X-ray显示纳米珍珠层/消旋聚乳酸复合人工骨植入兔桡骨缺损区后其骨愈合速度较对照组微米珍珠层/消旋聚乳酸复合人工骨植入的快，至植入术后24周，实验组骨缺损区接近正常骨密度，对照组骨缺损区密度较低，空白组则呈现骨不连状态；骨密度测量结果显示术后8周、16周、24周实验组的骨密度值高于对照组(P＜0.05，24周实验组的骨密度值与术前所测得的正常值无显著性差异P＞0.05动物取材大体所见均显示组织相容性良好，骨组织逐渐由植入材料两端向中央生长；常规切片HE染色及硬组织磨片Stevenel\'s blue/Van Geison\'s picro-fuchsin联合染色均可见实验组骨缺损区长势优于对照组，至术后24周，实验组骨髓腔与材料已呈相交通状；硬组织磨片荧光显微镜下观察，两组材料在术后8周处于骨生长最快速时期，16周时速度开始减慢，术后4、8、16周时实验组的新骨生长速度均较对照组的快

The study will develop the important research domain in the high efficiency grinding which has great potentialities, considering that the increase of heat transfer efficiency means an synchronous increase of the limit material removal rate under the condition of grinding unburn, therefore the further perfection of this study will not only increase the available material removal rate to a new level, but also solve the workpiece burn problem of the difficult-to-machining materials in the high efficiency grinding, which has great technical and economical significance

本项研究可望开拓高效磨削的极富潜力的重要研究方向，考虑到换热效率的提高本身也就意味着磨削时不发生烧伤的材料极限去除率的同步提高，因而进一步完善此项研究不仅可望将现有高效深切磨削的材料去除率提高到一个新水平，而且将有效解决难加工材料的高效磨削问题，其技术经济意义十分重大。

Through test and analysis, the influence of putting auxiliary air of the double inlet and double outlet coal pulverizer into operation upon ecomomic behavior of the boiler for 300 MW unit in one power plant has been obtained.

摘要通过试验分析了某电厂300MW机组锅炉所配双进双出钢球磨煤机辅助风投运对锅炉排烟温度的影响，结果表明，锅炉运行期间只要磨煤机一次风管不堵管，就无需投入磨煤机辅助风，辅助风仅在启动前和停磨煤机后吹扫管道时投入即可。

The results show that the mill current and particle filling increased with the coal feed flow when ventilation rate remained the same, mill current started to decline after rising to a peak, the beginning of the decline region corresponded to the optimal particle filling, at this point, the gap between balls were just full of coal particles, the mill was running close to maximum power, and grinding efficiency reached the highest.

研究结果表明，磨煤机通风量不变时，随着给煤量增加，磨内存煤量增加，磨煤机电流升高，电流上升到峰值后又有所下降，开始下降的区域对应的料位是最佳运行料位，此时，钢球间隙中刚好充满了煤粉颗粒，磨煤机接近最大功率运行，粉碎效率达到最高。

This trial test prows that when specific surface remains constant, the output of mill was l0%~15% increased per machine-hour, power consumption reduced 3 kWh/t; when admixture adding rate increased 6%, strength of test samples in each age is equal to that of samples without compound grinding aids added; the initial setting and final setting time are shortened slightly; the workability and fluidity of cement and the grindability of materials are improved remarkably.

结果表明，在比表面积保持不变时，台时产量可提高10%~15%，粉磨电耗成本可下降约3kWh/t；混合材掺量增加6%后，试样各龄期强度与不加复合助磨剂的水泥样强度相当；水泥的初、终凝时间均有所缩短；水泥的和易性、流动性及物料的易磨性能等方面均得到较大的改善。

It combines rough and fine processes into one and achieves low metal removal rate as compared with cutting processes such as welding and milling.

它与普通磨削的区别在于很高的磨削速度和进给速度，而高速磨削的定义随时间的不同在不断推进。20世纪60年代以前，磨削速度在50m/s时即被称为高速磨削；而20世纪90年代磨削速度最高已达500m/s。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。