浅谈“水源空调“在丹东市的推广使用

本文通过对“水源空调”的介绍,结合丹东市的地质情况,分析论证其在我市推广使用的可行性。     

Postoperative evaluation in mandibular prognathism treated by bilateral sagittal split osteotomy

The present study was undertaken to evaluate the postoperative relapse from the period of unwiring to 1 year postoperatively and its correlation to the amount of mandibular setback and change in vertical dimension after mandibular bilateral sagittal split osteotomy. Twenty-seven patients were evaluated cephalometrically by the time preoperatively, 6 weeks, 6 months and 1 year postoperatively. It was found that 1) the average amount of mandibular setback at pogonion point, 6 weeks postoperatively, is 7.6mm backward and 1.9mm downward, 2) the average amount of horizontal relapse at pogonion point, 6 months and 1 year postoperatively, are 1.9mm and 2.3mm respectively. 86% of the horizontal relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 3) the average amount of vertical relapse at pogonion point, 6 months and 1 year postoperatively, are 0.9mm and 1.1mm upward. 82% of the vertical relapse, 1 year postoperatively, occurs in the first 6 months after removal of intermaxillary fixation, 4) the amount of 1 year postoperatively horizontal relapse is significantly correlated both with the amount of horizontal mandibular set back and vertical downward change (r = 0.58, 0.67, p < 0.001), whereas the amount of vertical relapse is with the vertical downward change only, but horizontal setback isn't.     

刮板输送机接链用千斤拉的研究

针对刮板输送机的掐链、接链问题,研制出新型掐、接链用千斤拉,介绍了该装置的结构特点和工作原理,并对使用效果进行了分析。     

电气扰动引起的弯曲振动

分析了电气扰动引起机组弯曲振动的原因.认为电气扰动可以影响联轴器的同心度和转子的弯曲.本文还分析了这种振动的特点和处理措施.     

小型压裂技术的应用

在加砂压裂施工前进行小规模压裂，能使加砂压裂更加有效。通过对近两年来胜利油田应用小型压裂指导压裂设计的4口井实例的总结，说明了为确保加砂压裂施工的成功，尤其对端部脱砂压裂设计，小型压裂必不可少。同时介绍了Nolte方法和步骤，及小型压裂为加砂压裂设计提供的必要参数，讨论了参数解释的影响因素。为配合小型压裂工作，全面提高压裂技术水平，应选部分井进行岩石力学参数解释工作、适当延长压降测量时间，并测出瞬时停泵压力等。     

塔格糖制备方法研究进展

塔格糖是一种天然的低能量填充型甜味剂，并具有抑制高血糖、改善肠道菌群和不致龋齿等多种生理功效。目前主要通过生物和化学两种方法合成。