A novel long period passive vertical vibration isolatorconstructed by mounting reverse pendu- lums on two pairs of torsionsprings is presented. By theoretical analysis and numericalcalculation, it is shown that the is...A novel long period passive vertical vibration isolatorconstructed by mounting reverse pendu- lums on two pairs of torsionsprings is presented. By theoretical analysis and numericalcalculation, it is shown that the isolator can achieve much longerresonant period due to gravitational positive feedback and is smallerin size than the current torsion spring isolators with the samegeometric parameters.展开更多
The results of coincidence experiment which was carried out in the whole month of April,1985 by two gravitational wave detectors in stanford and in Guangzhou are presented.It is found that up to sensitivity of h 10^(-...The results of coincidence experiment which was carried out in the whole month of April,1985 by two gravitational wave detectors in stanford and in Guangzhou are presented.It is found that up to sensitivity of h 10^(-16)the number of coincident events did not excess the number expected statistically.展开更多
Perturbed effect of high-frequency gravitational radiation produced by microwave electromagnetic(EM)cavity on static detecting EM field is investigated,and corresponding perturbation solutions have been given.It is fo...Perturbed effect of high-frequency gravitational radiation produced by microwave electromagnetic(EM)cavity on static detecting EM field is investigated,and corresponding perturbation solutions have been given.It is found that the gravitational wave(GW)beam propagating along symmetric axis of the cavity is purely+type polarized in transverse traceless coordinate system,and it can make the static EM field generate a cumulative perturbed effect which is proportional to the time.For the gravitational radiation wave beams propagating along other directions,they are usually mixed radiation of+and x type polarization.Quality factor of the cavity plays a key role in interaction strength of the GW with the detecting EM field.展开更多
基金the Post-doctoral Foundation of Huazhong University of Science and Technology
文摘A novel long period passive vertical vibration isolatorconstructed by mounting reverse pendu- lums on two pairs of torsionsprings is presented. By theoretical analysis and numericalcalculation, it is shown that the isolator can achieve much longerresonant period due to gravitational positive feedback and is smallerin size than the current torsion spring isolators with the samegeometric parameters.
基金the Science Fund of the Chinese Academy of Sciences and United States National Science Foundation。
文摘The results of coincidence experiment which was carried out in the whole month of April,1985 by two gravitational wave detectors in stanford and in Guangzhou are presented.It is found that up to sensitivity of h 10^(-16)the number of coincident events did not excess the number expected statistically.
文摘Perturbed effect of high-frequency gravitational radiation produced by microwave electromagnetic(EM)cavity on static detecting EM field is investigated,and corresponding perturbation solutions have been given.It is found that the gravitational wave(GW)beam propagating along symmetric axis of the cavity is purely+type polarized in transverse traceless coordinate system,and it can make the static EM field generate a cumulative perturbed effect which is proportional to the time.For the gravitational radiation wave beams propagating along other directions,they are usually mixed radiation of+and x type polarization.Quality factor of the cavity plays a key role in interaction strength of the GW with the detecting EM field.
