两厢车尾门门洞止口边的设计和优化

汽车尾门是车身上重要的启闭件,以两厢车大后盖为例,介绍了尾门止口边的正向设计方法。以止口边技术要求、人机工程要求作为输入条件,将尾门止口边分为4个区域制作控制截面,以截面中推导的位置作为构造基础,制作三维止口边数据,并探讨了校验和优化方法。通过优化后的止口边方案,可使得尾门门洞止口边同时兼顾功能性、制造性、美观性等要求。     

从屠宰场到餐桌

让一切肉菜来源可以追溯,去向可以查证,责任可以追究,是肉菜流通追溯体系要达到的主要目的。     

IBM SCE＋落地中国

IBM与世纪互联合作的IBM SCE＋高价值云平台,不仅具有较好的安全性和可用性,同时能够满足企业级的定制化需求,承载企业核心生产应用。     

小习惯 大改变

减肥的核心是“管住嘴,迈开腿”。但“管住嘴”是管多少,“迈开腿”是迈多少？这就是“瘦瘦”减肥方案提供的内容。     

The Progress of a Microbeam Facility in the Institute of Plasma Physics

The progress of a microbeam facility in the institute of Plasma Physics was discussed in this paper.This kind of equipment can supply single-particle beam which may be implanted into cells in micrometer-radius and measured by a new outstanding detector among global microbeam systems.Measurements by some plain targets showed that the highest current after the accelerator tube can be larger than 20μA ,the H2^ current before the second bending magnet is near 0.9μA ,the current after the second bending magnet is near 0.8μA,and the current of the beam line(after a 2-mm diameter aperture)is near 0.25nA which is enough for the single-particle microbeam experiment.It took scientists 3 months to do their microbeam experiment after setting up the qccelerator beam line and get the microbeam from this equipment.Two pre0collimators were installed between the 2-mm diameter aperture and the collimator to survey the beam.Tracks on the CR39 film ectched in the solution of NaOH showed that the beam can go through the collimator including a 10μm diameter aperture and the 3.5μm thick vacuum sealing film(Mylar).A new method,which is called optimization of the beam quality,was put forward in this paper,in order to get smaller diameter of beam-spot in microbeam system.     

卓越IT是这样炼成的

神州数码信息系统被比喻为是公司的＂数字神经网络系统＂,其重要性不言而喻。那么IT部门是如何获得公司认可的呢？     

数据管理迈入自由云域时代

“在调整IT运营以改善服务交付及采用云计算的过程中，CIO逐渐认识到共享存储基础架构的优势。”NetAPP产品运营执行副总裁George Kurian说。     

30CrMo精冲钢连铸板坯高温力学性能研究

利用Gleeble-3800 热模拟机测试了30CrMo精冲钢连铸坯从1350 °C以5°C/s和15°C/s冷却至600~900°C拉伸的高温力学性能,通过扫描电镜对拉伸试样的断口形貌和显微组织进行了观察分析,讨论了各温度区域变形断裂的机理。结果表明,冷却速度增大,铸坯整体的断面收缩率减小,铸坯的热塑性降低。30CrMo精冲钢的第Ⅲ脆性温度区间在650~750°C。将二冷区矫直点入口处的铸坯角部温度提升至800°C以上可以有效避免角部裂纹发生。     

A Mutant of Bacillus Subtilis with High-Producing Surfactin by Ion Beam Implantation

In order to generate a mutant of Bacillus subtilis with enhanced surface activity through low energy nitrogen ion beam implantation, the effects of energy and dose of ions implanted were studied. The morphological changes in the bacteria were observed by scanning electron microscope （SEM）. The optimum condition of ions implantation, 20 keV of energy and 2.6 × 10^15N^＋/cm^2 in dose, was determined. A mutant, B.s-E-8 was obtained, whose surface activity of 50-fold and 100-fold diluted cell-free Landy medium was as 5.6-fold and 17.4-fold as the wild strain. The microbial growth and biosurfactant production of both the mutant and the wild strain were compared. After purified by ultrafiltration and SOURCE 15PHE, the biosurfactant was determined to be a complex of surfactin family through analysis of electrospray ionization mass spectrum （ESI/MS） and there was an interesting finding that after the ion beam implantation the intensities of the components were different from the wild type strain.     

Iodogen法~(125)I标记单克隆抗体10D9

采用Iodogen法,选择最佳标记条件进行12525I标记单克隆抗体10D9.标记产物用Sephadex G-50分离纯化,三氯醋酸(TCA)法测定标记率和放化纯,并对标记物的免疫活性及稳定性进行分析.结果显示,125I标记10D9的最佳条件为Iodogen用量10μg、10D9用量20μg、加入Na125I22.2MBq、室温反应8min,125I-10D9的标记率为(84.10±3.18)%,放化纯为(98.49±1.14)%,比活度为933.51 MBq/mg;125I-10D9与Daudi细胞的特异性结合率为(23.21±1.14)%;标记物加到含1%BSA的PBS中放置3W后放化纯度仍>90%.结果表明:Iodogen法125I标记10D9标记率和放化纯高,方法简便,标记物的稳定性好且能较好地保持其免疫活性.