新型紧固件用高温合金

新型紧固件用高温合金美国ＳＰＳ公司最近研制出一种高温合金专利产品ＡＥＲＥＸ￣（ＴＭ）３５０，旨在用于燃气涡轮发动机的螺栓。在７３０℃下，与ＵＤＩＭＥＴ７２０，ＷＡＳＰＡＬＯＹ，ＭＵＬＴＩ－ＰＨＡＳＥ１５９以及７１８合金等紧固件用合金相比，该合金表现出...     

SIMULATION OF ACTIVE CONTROL OF ROTATING STALL IN AXIAL COMPRESSOR

ＳＩＭＵＬＡＴＩＯＮＯＦＡＣＴＩＶＥＣＯＮＴＲＯＬＯＦＲＯＴＡＴＩＮＧＳＴＡＬＬＩＮＡＸＩＡＬＣＯＭＰＲＥＳＳＯＲＸｕＧａｎｇ（ＴｈｅｒｍａｌＥｎｇｉｎｅｒｉｎｇＤｅｐａｒｔｍｅｎｔ，ＴｓｉｎｇｈｕａＵｎｉｖｅｒｓｉｔｙ，Ｂｅｉｊｉｎｇ，１０００８４...     

两种新型航空航天结构胶

两种新型航空航天结构胶剑桥Ｄｕｘｆｏｒｄ公司的ＣＩＢＡ─ＧＥＩＧＹ聚合物分公司推出两种特殊配制的新型结构胶，用于航空航天工业。第一种Ｒｅｄｕｘ４２０－Ａ／Ｂ结构胶是一种高强度、高韧性的环氧胶，可广泛应用于航空航天工业的金属、木材、橡胶、纤维增强复合材...     

ANALYSIS OF THE RETURNED SIGNAL MODEL IN BISTATIC RADAR SYSTEMS

ＡＮＡＬＹＳＩＳＯＦＴＨＥＲＥＴＵＲＮＥＤＳＩＧＮＡＬＭＯＤＥＬＩＮＢＩＳＴＡＴＩＣＲＡＤＡＲＳＹＳＴＥＭＳＹｉｎＣｈｅｎｇｙｏｕ，ＸｕＳｈａｎｊｉａ，ＷａｎｇＤｏｎｇｊｉｎ，ＺｈｏｕＬｉｎｙｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉ...     

NUMERICAL INVESTIGATION OF UNSTEADY DROPLET COMBUSTION PROCESS IN HOT QUIESCENT AIR ENVIRONMENTS (HQAE)

ＮＵＭＥＲＩＣＡＬＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦＵＮＳＴＥＡＤＹＤＲＯＰＬＥＴＣＯＭＢＵＳＴＩＯＮＰＲＯＣＥＳＳＩＮＨＯＴＱＵＩＥＳＣＥＮＴＡＩＲＥＮＶＩＲＯＮＭＥＮＴＳ（ＨＱＡＥ）ＺｈｕＧｕａｎｇｓｈｅｎｇ，ＬｉｎＪｕｎｙｉ，ＺｈａｎｇＹｕｅｌｉｎ...     

NUMERICAL SIMULATION OF VORTEX BREAKDOWN ON A DELTA WING AT LOW SPEED

ＮＵＭＥＲＩＣＡＬ　ＳＩＭＵＬＡＴＩＯＮ　ＯＦ　ＶＯＲＴＥＸ　ＢＲＥＡＫＤＯＷＮ　ＯＮ　Ａ　ＤＥＬＴＡ　ＷＩＮＧ　ＡＴ　ＬＯＷ　ＳＰＥＥＤＺｈｕＺｉｑｉａｎｇ；ＪｉａＪｉａｎｂｏ（ＩｎｓｔｉｔｕｔｅｏｆＦｌｕｉｄＭｅｃｈａｎｉｃｓ，ＢｅｉｊｉｎｇＵｎ...     

PARALLEL COMPUTATION OF SUPER-SONIC BLUNT BODY VISCOUS FLOWFIELDS IN PVM

ＰＡＲＡＬＬＥＬＣＯＭＰＵＴＡＴＩＯＮＯＦＳＵＰＥＲ┐ＳＯＮＩＣＢＬＵＮＴＢＯＤＹＶＩＳＣＯＵＳＦＬＯＷＦＩＥＬＤＳＩＮＰＶＭＹａｎｇＸｉａｏｈｕｉ，ＷａｎｇＺｈｅｎｇｈｕａ，ＷａｎｇＣｈｅｎｇｙａｏ（Ｄｅｐｔ．１，ＮａｔｉｏｎａｌＵｎｉｖｅｒｓｉｔ...     

METHOD FOR CALCULATING KILL PROBABILITY OF MISSILE WITH CONTINUOUS ROD WARHEAD IN FORWARD HEMI-SPHERE ATTACKING

ＭＥＴＨＯＤＦＯＲＣＡＬＣＵＬＡＴＩＮＧＫＩＬＬＰＲＯＢＡＢＩＬＩＴＹＯＦＭＩＳＳＩＬＥＷＩＴＨＣＯＮＴＩＮＵＯＵＳＲＯＤＷＡＲＨＥＡＤＩＮＦＯＲＷＡＲＤＨＥＭＩ┐ＳＰＨＥＲＥＡＴＴＡＣＫＩＮＧＮｉｅＲｏｎｇｍｅｉ（聂蓉梅）,ＬｉＴｉｎｇｊｉｅ（李廷...     

ISO9000与欧洲航空航天工业

欧洲航空航天工业多年来一直强调的“质量体系方法”,现已通过ＩＳＯ9000族标准,提供给该行业的各部门使用。为配合ＩＳＯ9000的应用,欧洲航空航天协会(ＡＥＣＭＡ,法文缩写)补充制定了ＥＮ2000和ＥＮ3042两个标准,其内容包括本地区航空航天工业的一些特殊要求。ＡＥＣＭＡ还设立了一个认证机构(ＡＥＣＭＡ-ＣＥＲＴ),来负责管理按ＥＮ2000对制造商质量体系进行认可(Ａｐｐｒｏｖａｌ),以及按ＥＮ3042对航空航天产品进行鉴定(Ｑｕａｌｉｆｉｃａｔｉｏｎ)等工作。对欧洲标准中规定的所有航空航天产品来说,ＡＥＣＭＡ-ＣＥＲＴ的认证是强制的…     

COMPUTATION OF COMPRESSIBLE FLOW PAST SLENDER WING－BODY USING FULL－POTENTIAL EQUATION

ＣＯＭＰＵＴＡＴＩＯＮＯＦＣＯＭＰＲＥＳＳＩＢＬＥＦＬＯＷＰＡＳＴＳＬＥＮＤＥＲＷＩＮＧ－ＢＯＤＹＵＳＩＮＧＦＵＬＬ－ＰＯＴＥＮＴＩＡＬＥＱＵＡＴＩＯＮＨｕａｎｇＭｉｎｇｋｅ（ＤｅｐａｒｔｍｅｎｔｏｆＡｅｒｏｄｙｎａｍｉｃｓ，ＮａｎｊｉｎｇＵｎｉｖｅ...     

Access control system with hand geometry verification and smartcards

An access control system that joins the uniqueness of biometric verification, as well as the storage security and processing capabilities of smart cards, is defined here. The biometric technique chosen has been hand geometry, which is considered to provide low/medium security (there are other much more secure, as fingerprint, iris or retina), to be easy to use, to achieve high acceptance by users, and which performance is given throughout fast processing and medium cost. Also, the small template size needed for each user is positive for storage and processing capabilities required in the system. But the innovation in the system proposed is that the smart card not only stores the user's template, but also performs the verification process with the features set by the terminal to the card. With this improvement, the security of the system has risen because the template is never extracted from the card, avoiding duplication of such sensible data. The specifications for the enrolment process will be presented as well as the applications where this new system is recommended     

Implementation of hand geometry: an analysis of user perspectives and system performance

This discusses the implementation issues of installing a commercially available hand geometry system in the current infrastructure of Purdue University's Recreational Sports Center. In addition to a performance analysis of the system, a pre- and post-data collection survey was distributed to the 129 test subjects gathering information on perceptions of biometrics, in particular hand geometry, as well as participants' thoughts and feelings during their interaction with the hand geometry device. The results of the survey suggest that participants were accepting of hand geometry. Additionally, analyses of the participants' survey responses revealed that 93% liked using hand geometry, 98% thought it was easy to use, and 87% preferred it to the existing card-based system, while nobody thought the device invaded their personal privacy. System performance achieved a 3-try match rate of 99.02% (FRR 0.98%) when "gaming"/potential impostor attempts were removed from analysis. The failure to enroll rate was zero. Statistical analyses exposed a significant difference in the scores of attempts made by users with prior hand geometry usage, and subjects that could not straighten out their hand on the device. However, there were no statistical difference in the effects of rings/no rings, improper hand placements/proper hand placements, or gender on hand geometry score.     

无硝烟的战“疫”来临,他们携手奔赴战场!——记坚守在疫情防控“防输入”一线的虹桥机场医护团队

2020年春运,注定是一段不平凡的记忆。新冠肺炎疫情发生以来,机场工作人员坚守一线,奋力投身疫情防控阻击战!每天有数十万名乘客在虹桥枢纽抵离,在作为虹桥枢纽重要组成部分的虹桥机场,有一群消防急救保障部的医护人员,守护着这个城市空中门户,守护着市民健康和城市安全。     

Dynamic modeling and RBF neural network compensation control for space flexible manipulator with an underactuated hand

In space operation, flexible manipulators and gripper mechanisms have been widely used because of light weight and flexibility. However, the vibration caused by slender structures in manipulators and the parameter perturbation caused by the uncertainty derived from grasping mass variation cannot be ignored. The existence of vibration and parameter perturbation makes the rotation control of flexible manipulators difficult, which seriously affects the operation accuracy of manipulators. What’s mor...