目前,农机类传感器的生产,普遍采用标定的方法,趋向精度高,价格高;一般农机的受力设计要求不高,常根据试验和经验决定尺寸,这样的测力传感器不适应实际使用要求.针对这一问题.我们研制了两种测力传感器;传感器用理论公式测试,工艺简单....目前,农机类传感器的生产,普遍采用标定的方法,趋向精度高,价格高;一般农机的受力设计要求不高,常根据试验和经验决定尺寸,这样的测力传感器不适应实际使用要求.针对这一问题.我们研制了两种测力传感器;传感器用理论公式测试,工艺简单.试验结果表明,精度符合要求,有推广价值.1 梁式测力传感器1.1 受力分析传感器的结构简图,电阻应变片的粘贴和连接电桥,如图1所示.梁为矩形载面,宽度相同,高度不同;为了加力,DE 段较其两边的高度大.设 AD 和 BE 段的轴惯性矩为 I_1。展开更多
Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method br...Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method brought out can effectively eliminate the systematic error caused by the instrumental system, and greatly improve the surveying precision and the reliability of the survey results.展开更多
A plasma spectroscopy experiment is described and its performances are given, ways oI excltauon u^ttc~,t tc~,,,,,~ ,,, free-burning plasma at atmospheric pressure is analyzed in detail. The fixed-grating spectrograph ...A plasma spectroscopy experiment is described and its performances are given, ways oI excltauon u^ttc~,t tc~,,,,,~ ,,, free-burning plasma at atmospheric pressure is analyzed in detail. The fixed-grating spectrograph PGS-2 Carl Zeiss Jena is actually a variation on the very first spectrometer design, where photo-plate was replaced with a detector array of PIXIS-Roper Scientific camera. Abilities of the system are analyzed and its limitations are determined.展开更多
This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter ...This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232,the surveying accuracy is very high and repetition is good,and their inner surveying accuracy is about 2-3 microGal.展开更多
In the standard model of particle physics, photons are massless particles with a particular dispersion relation. Tests of this claim at different scales are both interesting and important. Experiments in territory lab...In the standard model of particle physics, photons are massless particles with a particular dispersion relation. Tests of this claim at different scales are both interesting and important. Experiments in territory labs and several exterritorial tests have put some upper limits on photon mass, e.g., torsion balance experiment in the lab shows that photon mass should be smaller than 1.2 x 10-51g. In this work, this claim is tested at a cosmological scale by looking at strong gravitational lensing data available and an upper limit of 8.71 x 10-39g on photon mass is given. Observations of energy-dependent gravitational lensing with not yet available higher accuracy astrometry instruments may constrain photon mass better.展开更多
文摘目前,农机类传感器的生产,普遍采用标定的方法,趋向精度高,价格高;一般农机的受力设计要求不高,常根据试验和经验决定尺寸,这样的测力传感器不适应实际使用要求.针对这一问题.我们研制了两种测力传感器;传感器用理论公式测试,工艺简单.试验结果表明,精度符合要求,有推广价值.1 梁式测力传感器1.1 受力分析传感器的结构简图,电阻应变片的粘贴和连接电桥,如图1所示.梁为矩形载面,宽度相同,高度不同;为了加力,DE 段较其两边的高度大.设 AD 和 BE 段的轴惯性矩为 I_1。
文摘Testing methods of instrumental system in the marine magnetic survey have been studied in this paper, and the feasibility of each method has been testified by the observed data. The conclusion shows that the method brought out can effectively eliminate the systematic error caused by the instrumental system, and greatly improve the surveying precision and the reliability of the survey results.
文摘A plasma spectroscopy experiment is described and its performances are given, ways oI excltauon u^ttc~,t tc~,,,,,~ ,,, free-burning plasma at atmospheric pressure is analyzed in detail. The fixed-grating spectrograph PGS-2 Carl Zeiss Jena is actually a variation on the very first spectrometer design, where photo-plate was replaced with a detector array of PIXIS-Roper Scientific camera. Abilities of the system are analyzed and its limitations are determined.
基金Supported by the Fund of Institute of Seismology,CEA (No.IS200736026)
文摘This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232,the surveying accuracy is very high and repetition is good,and their inner surveying accuracy is about 2-3 microGal.
文摘In the standard model of particle physics, photons are massless particles with a particular dispersion relation. Tests of this claim at different scales are both interesting and important. Experiments in territory labs and several exterritorial tests have put some upper limits on photon mass, e.g., torsion balance experiment in the lab shows that photon mass should be smaller than 1.2 x 10-51g. In this work, this claim is tested at a cosmological scale by looking at strong gravitational lensing data available and an upper limit of 8.71 x 10-39g on photon mass is given. Observations of energy-dependent gravitational lensing with not yet available higher accuracy astrometry instruments may constrain photon mass better.
