Research on the Distant Hybrids of Wheat Obtained via Low-Energy Ion-Beam Implantation

Abstract The whole DNA of soybean was implanted into four varieties of wheat of Zhongyu5, Huaiyin 9628, Wenyou 1, Jimai 5 respectively via ion-beam mediation. There were 5 plantsobtained whose protein content was higher than 18.5%, the highest one was 21.44%. There were 3plants obtained whose protein content was lower than 11.5%, the lowest one was 10.96%. We cansee that the whole DNA of soybean transformed into wheat via ion beam implantation can inducethe increase in wheat protein content dramatically. The result also shows that the transformationefficiency of different gene types of wheat receptor varies greatly that the implanting time has acertain effect on the efficiency of transformation.     

基于数控仿型的逆向工程技术在模具制造中的应用

介绍了一种基于数控仿型的逆向工程应用系统的组成、原理及应用。     

现代信息网络系统频谱分析与精确测量

随着现代信息网络系统频谱分析研究的不断深入,对应用频谱分析仪测量信号的精确度提出了更高的要求。以信息网络系统匹配传输技术要求为标准,对信息进行必要的频谱分析,在综合考虑影响频谱仪灵敏度与测量精确度的各种因素后,选择最合理的测量方案,使测量结果更精确,确保信号传输更通畅。     

CT and MRI characteristics of intracranial hemorrhage complicating breech and vacuum delivery

The CT/MRI brain findings and sequelae of intracranial hemorrhage resulting from traumatic breech and vacuum delivery of 16 term newborn infants are presented. Eleven infants were vacuum extracted, while the remaining five infants were delivered breech. Except for three breech-delivered infants who had intraventricular hemorrhage, the location and nature of hemorrhage were similar in both groups. Nine of the 11 vacuum-extracted babies showed complete resolution of hemorrhage on follow-up examination. None of the breech cases had a normal outcome. All five of the latter group had hydrocephalus, and one case each demonstrated porencephaly and encephalomalacia.     

圆坯连铸结晶器温度场模拟与坯壳厚度预测

基于连铸圆坯结晶器温度与热流实测数据,建立了连铸圆坯凝固的三维传热模型,计算出结晶器和铸坯的温度场,并得到铸坯的固相率与坯壳厚度分布情况.温度计算结果与实测数据符合较好,表明此数学模型能够较为准确地反映实际情况.讨论了拉速、浇注温度等因素对坯壳厚度的影响,并对利用模型计算与经验公式计算得到的坯壳厚度进行了对比.     

基于UG的橡胶轮胎花纹、花粒成型铜电极的五轴加工方法

阐述了在UG软件中电动自行车橡胶轮胎花纹的成型铜电极的五轴加工方法。     

汽提塔的制造

氯碱厂用汽提塔塔体圆度、直线度、塔盘平面度都有严格要求，在试制过程对塔体纵环缝焊接坡口、焊接过程、塔盘加工和组装进行了有效的控制，从而满足了设计要求，本文对汽提塔的制造工艺进行了全面总结。     

鹤煤热电厂气力输灰系统的改进

鹤煤热电厂气力输灰系统在运行中存在经常发生堵管,管道磨损严重,耗气量大等问题。因此,该厂针对输送管道及仓泵布置进行了改进,通过更换磨损弯头,降低输灰速度,基本解决了上述问题,满足了输灰要求,保证了系统运行的稳定性。     

锻造ZK60镁合金的搅拌摩擦焊工艺

采用搅拌摩擦焊焊接工艺对4 mm厚的锻造ZK60镁合金板进行了焊接试验,研究了搅拌头轴肩尺寸、旋转速度及焊接速度等对焊缝质量及接头抗拉强度的影响,并得到了较佳焊接工艺参数。结果表明:在其他条件一定时,焊接接头的抗拉强度随搅拌速度的增加而增大,随焊接速度的增加而先增大后减小;当搅拌头轴肩直径为15 mm、旋转速度为1 170 r.min-1,焊接速度为36 mm.min-1时,所得焊缝表面光滑,无裂纹、孔洞、疏松及未焊透等缺陷,接头的抗拉强度最大,为271.2 MPa,约为母材的85%。     

Field Measurements and Modeling of Two-Stage Biofilter that Treats Odorous Sulfur Air Emissions

Because the presence of hydrogen sulfide (H2S) and methyl mercaptan (MeSH) inhibits the removal of some organic reduced sulfur compounds (e.g., dimethyl sulfide, Me2S) in biofilters, a two-stage biofilter may be an appropriate method to treat a mixture of reduced sulfur compounds. This work studied the treatment of odorous air emissions [a mixture of H2S, MeSH, Me2S, and dimethyl disulfide (Me2S2)] using a two-stage biofilter. H2S had the highest overall removal efficiency (96%) followed by MeSH and Me2S (90 and 91% removal, respectively) and Me2S2 (81%). Most of the removal of H2S, MeSH, and Me2S2 occurred in the primary biofilter (72% H2S, 66% MeSH, and 52% Me2S2), while most of the Me2S removal occurred in the secondary biofilter (64% Me2S). A dynamic model that describes biofiltration was calibrated and validated to H2S and MeSH field data. This is the first time a model was evaluated with organic odor-causing sulfur compound data obtained from a biofilter packed with compost and wood chips. Model simulations showed that H2S removal in a lava rock packed biofilter would be better than in a similar biofilter packed with compost and wood chips.