Loading effects on rat craniomandibular morphology: a system for gravity studies

Gravity effects on muscle and bone are a major impediment to long-term space travel. We introduce a model for studying these effects, the craniomandibular system. Some advantages of this system include: (1) craniomandibular morphology is determined by epigenetic factors including gravity, (2) relatively light forces can significantly alter its morphology, and (3) soft diet and tooth loss produce effects that are similar to those produced in lower limbs by weightlessness. In the study, implants made either of gold (experimental group) or lightweight acrylic (controls) were attached to adult rats' mandibles. After 13 weeks, the animals' skulls and mandibles were dissected. Pair-wise comparisons indicated that the experimental animals showed significantly shortened and narrowed cranial bases, and significant changes in the posterior zygomatic arch region. These results indicate that simulated macrogravity influences bone remodeling in the adult craniomandibular system.     

XLG3TM手持式工业视频内窥镜三维相位测量

GE检测控制技术业务是一个行业领先创新者,业务涉及传感测量,无损检测技术,状态监测,与自动化优化控制领域,帮客户实现精确、高效和安全.旗下产品广泛应用于航空航天、石油天然气、电力、运输、医疗等行业.     

GE推出适用于电子制造业的高性能X射线检测系统——phoenix xlaminer

2011年5月12日,GE检测控制技术宣布最新推出的新型phoenix x|aminer是一个微焦点X射线检测系统,有5个轴,主要用于电子元件分装的质量控制,并适用于焊点的可靠精确检测。     

Six-month space greenhouse experiments--a step to creation of future biological life support systems

SVET Space Greenhouse (SG)--the first automated facility for growing of higher plants in microgravity was designed in the eighty years to be used for the future BLSS. The first successful experiment with vegetables was carried out in 1990 on the MIR Space Station (SS). The experiments in SVET SG were resumed in 1995, when an American Gas Exchange Measurement System (GEMS) was added. A three-month wheat experiment was carried out as part of MIR-SHUTTLE'95 program. SVET-2 SG Bulgarian equipment of a new generation with optimised characteristics was developed (financed by NASA). The new SVET-GEMS equipment was launched on board the MIR SS and a successful six-month experiments for growing up of two crops of wheat were conducted in 1996 - 97 as part of MIR-NASA-3 program. The first of these "Greenhouse" experiments (123 days) with the goal to grow wheat through a complete life cycle is described. Nearly 300 heads developed but no seeds were produced. A second crop of wheat was planted and after 42 days the plants were frozen for biochemical investigations. The main environmental parameters during the six-month experiments in SVET (substrate moisture and lighting period) are given. The results and the contribution to BLSS are discussed.     

分析吸气式运载工具的简单关系式

以往几十年中,人们一直对在运载工具的部分爬升段中以吸气式推进代替火箭推进的可能性争论不休.近几年来,这种争论日趋激烈.但不管怎样,目前有必要对此开展一些基本的系统研究.本文给出一组描述运载工具的速度参数(α)和比冲参数(β)等质量分数的简单关系式.但愿这些关系式能有助于选择最佳的吸气式运载工具(ABLV).本文只给出单级入轨运载工具(SSTO)的关系式,这并不表明SSTO优先于多级运载工     

中国运载火箭技术研究院一○二所 通过国家标准检测实验室认可

2000年12月22日至24日，中国实验室国家认可委员会(简称CN ACL)对中国运载火箭技术研究院一○二所进行了现场评审，依据ISO/IEC Guide 25及相关文件，CN ACL对中国运载火箭技术研究院一○二所申报的长度、热学、力学、电学等四类共87大项校准检测项目给予了认可。同时，该所获得国际实验室、认可合作组织的其他35个国际实验室认可机构的认可，由该所出具的相应参数的校准证书和检测报告将得到27个国家和地区的承认。 缪寅宵报道     

Precision motion control for electro-hydraulic axis systems under unknown time-variant parameters and disturbances

This article focuses on asymptotic precision motion control for electro-hydraulic axis systems under unknown time-variant parameters, mismatched and matched disturbances. Different from the traditional adaptive results that are applied to dispose of unknown constant parameters only, the unique feature is that an adaptive-gain nonlinear term is introduced into the control design to handle unknown time-variant parameters. Concurrently both mismatched and matched disturbances existing in electro-hy...     

GE传感与检测Rhythm超声软件

2008年10月26日,GE传感与检测科技宣布推出Rhythm超声软件,这是Rhythm软件包中第一个专门用于超声波探伤的元件.     

ZOLLER和Tebis帮您拒绝设备停工期

生产企业总是希望购买的生产设备能够每周7天每天24小时不停地运转,同时还会希望有一种解决方案能让刀具在工件加工过程中避免干涉的影响。ZOLLER和Tebis能够帮您解决这些问题。