نتایج جستجو برای: gravimeter isn
تعداد نتایج: 859 فیلتر نتایج به سال:
State Key Laboratory of ISN, Xidian University, Xi’an, 710071, China State Key Laboratory of Information Security, Graduate University of Chinese Academy of Sciences, Beijing, 100049, China 3 Department of Applied Mathematics, Xidian University, Xi’an, 710071, China 4 Guangxi Key Laboratory of Wireless Wideband Communication and Signal Processing, Guilin University of Electronic Technology, Gui...
We review some of the salient results presented at this Workshop, together with some comments on the underlying physics, and the proposed facilities for future experiments. ISN 93–17 February 5, 2008. Invited talk at the Workshop on Spin and Flavour in Hadronic and Electromagnetic Interactions, Turin, September 1992, to appear in the Proceedings SPIN AND FLAVOUR: CONCLUDING REMARKS
A Bose-Einstein condensate (BEC) is frequently described as the matter-wave analog of an optical laser – the preferred source for optical interferometry. In this project, we have demonstrated an atom interferometer-based gravimeter using a Rb Bose-condensed source [1]. Our data represent the highest fringe visibility yet achieved in such a device (Fig. 1), for both standard, and large-momentum-...
Abstract. We analyze VLBI delays back to 1984 from the permanent geodetic network, and ten superconducting gravimeter records from the Global Geodynamic Project spanning more than 7 years. From the former data, we deduce nutation offsets, and from the latter we get gravimetric factors. Comparison of these observed quantities against theoretical expressions of the core and mantle admittance to t...
We report on a precision measurement of gravitational acceleration using ultracold strontium atoms confined in an amplitude-modulated vertical optical lattice. An uncertainty Δg/g ≈ 10(-7) is reached by measuring at the 5th harmonic of the Bloch frequency. The value obtained with this microscopic quantum system is consistent with the one measured with a classical gravimeter. Using lattice modul...
Salicylic acid (SA) is a key defense signal molecule against biotrophic and hemibiotrophic pathogens in plants, but how SA is synthesized in plant cells still remains elusive. Identification of new components involved in pathogen-induced SA accumulation would help address this question. To this end, we performed a large-scale genetic screen for mutants with altered SA accumulation during pathog...
A systematic study of sensitil'ilY enhancement in ' ~N NMR spectra of phosphorus-nilrogf'o compounds by 3IP.I5N polariSlllion tfllrtsff'r \'l as .,..rformed !ISing Iris-(dimethylamioo)phosphine ( I) as a model compound. The application of sen!ral mul1ipulse lechoiques (refocussed and oon-rdocussed INEPT. DEPT) lind dccoupling sclw>mes shows lh:tl muimum enhaocement \'I'as reached \'lith fhe non...
As this paper has described, methods are available for addressing all of the reasons organizations choose the wrong projects, including quantitative methods for identifying projects on the efficient frontier. Some organizations that regularly make high-stakes, project-selection decisions (e.g. some financial institutions, oil and gas exploration companies, pharmaceutical companies, some high-te...
The notion that biological systems come to embody optimal solutions seems consistent with the competitive drive of evolution. It has been used to interpret many examples of sensorimotor behavior. It is attractive from the viewpoint of control engineers because it solves the redundancy problem by identifying the one optimal motor strategy out of many similarly acceptable possibilities. This pers...
We describe development of a transportable version of the Superconducting Gravimeter (SG) and its test in a field experiment to monitor storage in a karst (limestone) aquifer in central Texas. The SG is contained within two aluminum enclosures, one holding the SG in its 35 liter helium dewar, plus electronics; and the second for refrigerator and power supply. In the field test, the SG was suppo...
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