10米高空作业车

10米高空作业车有QYJ5040JGKZ10(简称GKZ10)、QYJ5040JGKC10(简称GKC10)两个品种。可广泛用于路灯检修、树木剪枝、灭虫、交通标志的安装更换等。GKC10型是垂直升降式,具有结构简单、升降迅速、平稳和一     

各国标准点滴介绍

一、10号碳素结构钢表示方法中国(GB) 10苏联(ГОСТ) 10波兰(PN) 10西德(DIN) C10东德(TGL) C10法国(NF) C10日本(JIS) S10C罗马尼亚(STAS) OLC10美国(AISI) 1010英国(B、S) En2A捷克(CSN) 12021二、▽_4表面光洁度代号表示方法中国▽_4苏联▽▽_4波兰▽_4西德▽▽东德▽▽法国▼▼日本▽▽罗马尼亚 H_(CK)3.2～6.3美国▽▽_4英国 ff捷克 6.3     

2003年下半年相关国际展会

展会日期展　　会　　名　　称展会地点0 9/0 4——— 0 9/11卖国东岸工具机械展美国麻州0 9/10——— 0 9/13印尼国际金属加工机械暨工具机展印尼雅加达10 /10——— 10 /12法国里昂汽车展览会法国里昂10 /2 0——— 10 /2 3加拿大国际工具机展加拿大10 /2 1——— 10 /2 8米兰国际工具机暨金属加工机械展意大利米兰11/2 1——— 11/2 4泰国国际工具机暨金属加工机械展泰国曼谷2003年下半年相关国际展会     

超声疲劳试验方法在40Cr钢疲劳性能研究中的应用

用超声疲劳试验方法(频率为20kHz)测定40Cr钢在10^5～10^10周次范围内的疲劳寿命(S-N)曲线。结果表明，40Cr钢的疲劳寿命(SN)曲线在10^5～10^10周次范围内始终保持下降趋势，在l0^5周次以上没有水平段。超高频疲劳载荷下的S-N曲线同样能用Basquin关系式描述。与常规频率下的疲劳性能相比，高频载荷下的疲劳强度增加。20kHz循环载荷下，40Cr钢10^7周次的疲劳强度为443MPa，10^10周次时为235MPa。     

量子化霍尔电阻基准

具有我国自主知识产权的量子化霍尔电阻基准日前通过专家鉴定，其10-10(10的负10次方)量级，百亿分之几的准确度达到国际同类基准之首。     

10 kV接地线快速收放装置研究

10 kV接地线对于配网施工检修人员来说,是保护人身安全必不可缺少的防护工具,10 kV线路停电后所做的安全措施都离不开10 kV接地线。有时10 kV线路停电施工或检修需要多组10 kV接地线,由于10 kV接地线的接地铜引线长,并绕在自身的绝缘杆上,因此放线和收线十分费时费力,施工时非常不方便。现通过对10 kV接地线收线和放线过程进行分析,并结合实际生产需要,制作出一台能快速收放接地线的装置,可以提高工作效率,同时有效保护10 kV接地线,解决了10 kV接地线收放及存放的种种难题。     

《中国设备工程》2007年1～12期总目录

1￣10期目录纪念专栏《全民所有制工业交通企业设备管理条例》起草过程大事记…10-5坚持科学发展加强设备管理############10-11《设备管理条例》精神永存#############10-13《设备管理条例》开创了我国设备管理的新时代####10-14纪念《设备管理条例》颁布20周年继续搞好人才培养……10-15坚持《设备管理条例》基本精神在新形势下不断充实提高………………………………………………………………10-17《设备管理条例》为搞好设备管理指引航向######10-18贯彻《设备管理条例》坚持综合管理思想######10-19传承文明成果推进科学发展构建符合社…     

5、1OKV电流互感器

北京瑞恒电力器材有限公司 　　产品型号:LRB0.2/0.5/5P15 　　序号:1198天津市互感器厂 　　产品型号:LZZBJ9-10(A.B.C)、LZZBJ(10-21)-10Q(A.B.C)、 LFSQ-10、LBJ-10、LJ-2,4,7 　　序号:1199 　　……     

治过敏性鼻炎特效方

取荆芥10克,防风6克,苍耳子10克,菊花10克,羌活10克,川芎10克,薄荷5克(后下),生姜2片,甘草3克.水煎服,每日1剂.一般3剂可愈.本方有辛温散寒的功效,适用于风寒型过敏性鼻炎患者.     

浅析10kV配电运行的故障以及防治措施

文章主要针对10k V配电运行的故障以及防治措施进行分析,结合当下10k V配电运行的发展现状为根据,从10k V配电运行的故障、10k V配电运行防治措施等方面进行深入研究与探索,主要目的在于更好地推动10k V配电线路运行的发展与进步。     

基于FLANN和最小二乘的磁梯度计误差校正

在基于偶极子磁场分量梯度的水下磁异常定位方法中,三轴磁力计自身误差及两磁场坐标系配准误差等是限制水下定位精度的主要因素,因此有必要对其进行校正,补偿磁场分量梯度计测量值。建立了磁场分量梯度计的测量误差模型,提出了基于函数链接型神经网络(functional link artificial neural network,FLANN)和最小二乘法的磁场分量梯度计误差校正方法,给出了误差参数辨识及校正算法,数值仿真和实测数据证明了校正算法具有良好的收敛性,能显著地抑制磁场分量梯度测量误差,该校正方法为提高磁场分量梯度计性能提供了一种可行途径。     

十字形磁梯度张量系统的误差校正

针对十字形磁梯度张量系统中的单磁力仪误差(三轴灵敏度偏差、非正交误差和零点漂移误差)以及磁力仪之间存在的不对正误差,提出了十字形磁梯度张量系统的误差校正方法。首先,建立单磁力仪误差模型,采用基于椭球约束的最小二乘拟合算法对磁力仪的测量数据进行拟合从而得到椭球拟合参数;然后,接着利用Cholesky分解得到单磁力仪误差校正矩阵;最后在单磁力仪误差校正的基础上,利用正交Procrustes方法对不同磁力仪间的测量数据进行拟合从而得到磁力仪间的不对正误差校正矩阵。对提出的方法进行仿真与实测实验验证,实验结果表明:经过校正,磁梯度张量各分量的最大波动量由10 049nT/m降到52nT/m。提出的校正方法可以基本消除十字形磁梯度张量系统的误差,提高测量结果的准确度,且方法操作简单,不需要高精度的三轴无磁转台等设备,具有较高的实用价值。     

Unshielded fetal magnetocardiography system using two-dimensional gradiometers

We developed a fetal magnetocardiography (fMCG) system that uses a pair of two-dimensional gradiometers to achieve high signal-to-noise ratio. The gradiometer, which is based on a low-Tc superconducting quantum interference device, detects the gradient of a magnetic field in two orthogonal directions. Gradiometer position is easy to adjust by operating the gantry to drive the cryostat in both the swinging and axial directions. As a result, a fMCG waveform for 25 weeks' gestation was measured under an unshielded environment in real time. Moreover, the P and T waves for 25 and 34 weeks' gestation, respectively, were obtained by averaging. These results indicate that this two-dimensional gradiometer is one of the most promising techniques for measuring fetal heart rate and diagnosing fetal arrhythmia.     

Inertial measurement using atom interferometry

The recent advances of atom interferometer and its application in precision inertial measurement are review ed. The principle,characteristics and implementation of atom interferometer are introduced and it can be used to measure gravitational acceleration,gravity gradient and rotation for its high sensitivity. We also present the principle,structure and new progress of gravimeter,gravity gradiometer and gyroscope based on atom interferometer.     

Note: Low temperature superconductor superconducting quantum interference device system with wide pickup coil for detecting small metallic particles

A one-channel low temperature superconductor superconducting quantum interference device system comprising a second-order axial gradiometer with a sensing area of 10 mm × 190 mm was developed. The gradiometer was mounted in a liquid-helium dewar (450-mm diameter; 975-mm length), with a gap of 12 mm between the pickup coil and the dewar-tail surface. The magnetic field sensitivity was measured to be 16 fT∕Hz(1∕2) in the white noise regime above 2 Hz. The system was used to measure stainless steel particles of different sizes passing through the sensing area. A 100-μm diameter SUS304 particle was readily detected passing at different positions underneath the large pickup coil by measuring its 1.3-pT magnetic field. Thus, the system was shown to be applicable to quality control of lamination sheet products such as lithium ion batteries.     

Note: Unshielded bilateral magnetoencephalography system using two-dimensional gradiometers

Magnetoencephalography (MEG) noninvasively measures neuronal activity with high temporal resolution. The aim of this study was to develop a new type of MEG system that can measure bilateral MEG waveforms without a magnetically shielded room, which is an obstacle to reducing both the cost and size of an MEG system. An unshielded bilateral MEG system was developed using four two-dimensional (2D) gradiometers and two symmetric cryostats. The 2D gradiometer, which is based on a low-T(c) superconducting quantum interference device and wire-wound pickup coil detects a magnetic-field gradient in two orthogonal directions, or ?/?x(?(2)B(z)/?z(2)), and reduces environmental magnetic-field noise by more than 50 dB. The cryostats can be symmetrically positioned in three directions: vertical, horizontal, and rotational. This makes it possible to detect bilateral neuronal activity in the cerebral cortex simultaneously. Bilateral auditory-evoked fields (AEF) of 18 elderly subjects were measured in an unshielded hospital environment using the MEG system. As a result, both the ipsilateral and the contralateral AEF component N100m, which is the magnetic counterpart of electric N100 in electroencephalography and appears about 100 ms after the onset of an auditory stimulus, were successfully detected for all the subjects. Moreover, the ipsilateral P50m and the contralateral P50m were also detected for 12 (67%) and 16 (89%) subjects, respectively. Experimental results demonstrate that the unshielded bilateral MEG system can detect MEG waveforms, which are associated with brain dysfunction such as epilepsy, Alzheimer's disease, and Down syndrome.     

Mathematical modeling of fluxgate magnetic gradiometers

Issues of designing fluxgate magnetic gradiometers are considered. The areas of application of fluxgate magnetic gradiometers are determined. The structure and layout of a two-component fluxgate magnetic gradiometer are presented. It is assumed that the fluxgates are strictly coaxial in the gradiometer body. Elements of the classical approach to the mathematical modeling of the spatial arrangement of solids are considered. The bases of the gradiometer body and their transformations during spatial displacement of the gradiometer are given. The problems of mathematical modeling of gradiometers are formulated, basic mathematical models of a two-component fluxgate gradiometer are developed, and the mathematical models are analyzed. A computer experiment was performed. Difference signals from the gradiometer fluxgates for the vertical and horizontal position of the gradiometer body are shown graphically as functions of the magnitude and direction of the geomagnetic field strength vector.     

Demonstration of magnetoelectric scanning probe microscopy

A near-field room temperature scanning magnetic probe microscope has been developed using a laminated magnetoelectric sensor. The simple trilayer longitudinal-transverse mode sensor, fabricated using Metglas as the magnetostrictive layer and polyvinylidene fluoride as the piezoelectric layer, shows an ac field sensitivity of 467+/-3 microV/Oe in the measured frequency range of 200 Hz-8 kHz. The microscope was used to image a 2 mm diameter ring carrying an ac current as low as 10(-5) A. ac fields as small as 3 x 10(-10) T have been detected.     

基于AD9833信号发生器的设计

介绍了基于AD9833的信号发生器的设计方案。由单片机AT89S52完成系统的控制功能;幅度控制采用AD8320可编程增益放大器和D／A转换芯片TLC7528实现：功率放大电路采用高速缓冲器BUF634。最大可输出250mA的电流。实验表明该系统能够产生正弦波、方波和三角波三种周期性波形,且能实现从1Hz-2MHz的稳定输出,频率稳定度优于10^-4。     

飞轮组件微振动对高分辨率光学卫星光轴的影响

为了研究高分辨率光学卫星星上飞轮的微振动对卫星成像质量的影响,分别建立了飞轮扰动模型和整星结构动力学模型。首先,对飞轮组件系统进行了地面扰动测试,对实测扰动数据的分析表明,飞轮组件在与转速相关的一阶频率50Hz处产生一次谐波,在190Hz与280Hz左右存在与转速无关的一系列峰值。然后,对整星进行了单位正弦激励,获得了光轴角位移响应,并对其与飞轮实测扰动数据进行了集成分析。分析结果表明:整星在50~80 Hz和230~280Hz的角位移响应有较多的谐振响应频率成分,沿光轴方向和垂直光轴方向整星光轴的角位移最大谐振响应幅值分别为2.718″、2.739″,在245Hz左右存在较多幅值为0.5″量级的谐波。分析显示飞轮组件微振动对高分辨率光学卫星成像质量影响较大,得到的结果可为整星系统的优化设计和隔振补偿措施提供参考依据。