摘要 :
The reverse circulation drilling technology is that drilling fluid
is pumped down to the annulus, through drill bit and inside of
the drilling tool, comes back to the ground. It has many
advantages, such as reducing the formati...
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The reverse circulation drilling technology is that drilling fluid
is pumped down to the annulus, through drill bit and inside of
the drilling tool, comes back to the ground. It has many
advantages, such as reducing the formation leakage, protecting
the oil and gas formation, and cutting sample very clear etc. It
includes air lifting, air and pump sucking reverse circulation
drilling. Air lifting reverse circulation drilling needs air
compressor, air tank, air box, double wall drill tool, air mixer
and reverse drilling bit etc. By applying the original drilling
rig, these equipments are connected to drill string and carried
out the drilling work, after finishing drilling work, these
equipments can be removed totally, and have no influence to
the normal drilling work. Through testing and on-site
application, these equipments are coordinative, drilled 400m
in the leaking formation and got a better effect.
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摘要 :
The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us,^ and a scheme for phase-mismatch-compensalion is proposed, which is based on the matching of both the group velocity and pu...
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The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us,^ and a scheme for phase-mismatch-compensalion is proposed, which is based on the matching of both the group velocity and pulse front between signal and idler by the combination of the no collinear-phase-malch and pulse-fronl-Ull that is accomplished by angular dispersion of the interacting rays. By this Scheme, the phase mismatch to first order in Irequcncy shift can be completely compensated, and then an ultra-broadband OPCPA is realized. It is shown that the phase mismatch to both first and second order can be completely compensated simultaneously in some cases, and this leads to an extremely broadband spectral width. Therefore the important criterion for constructing an ultra-broadband OPCPA that both pulse-front and group-velocity between signal and idler are exactly matched simultaneously. Finally, specihe numerical calculations and simulations are presented for BBO-OPCPA with type-1 noncollinear angularly dispersed geometry.
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摘要 :
The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and a scheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and pul...
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The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and a scheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and pulse front between signal and idler by the combination of the no collincar-phasc-match and pulse-front-till that is accomplished by angular dispersion of the interacting rays. By this Scheme, the phase mismatch to first order in frequency shift can be completely compensated, and then an ultra-broadband OPCPA is realized. It is shown that the phase mismatch to both first and second order can be completely compensated simultaneously in some cases, and this leads to an extremely broadband spectral width. Therefore the important criterion for constructing an ultra-broadband OPCPA that both pulse-front and group-velocity between signal and idler are exactly matched simultaneously. Finally, specific numerical calculations and simulations are presented for BBO-OPCPA with type-Ⅰ noncollinear angularly dispersed geometry.
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摘要 :
The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and ascheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and puls...
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The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and ascheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and pulse front between signal and idler by the combination of the no collinear-phase-match and pulse-front-tilt that is accomplished by angular dispersion of the interacting rays. By this Scheme, the phase mismatch to first order in frequency shift can be completely compensated, and then an ultra-broadband OPCPA is realized. It is shown that the phase mismatch to both first and second order can be completely compensated simultaneously in some cases, and this leads to an extremely broadband spectral width. Therefore the important criterion for constructing an ultra-broadband OPCPA that both pulse-front and group-velocity between signal and idler are exactly matched simultaneously. Finally, specific numerical calculations and simulations are presented for BBO-OPCPA with type-I noncollinear angularly dispersed geometry.
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摘要 :
The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and a scheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and pul...
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The problem of phase-mismatch-compensation for ultra-broadband OPCPA is first studied theoretically by us, and a scheme for phase-mismatch-compensation is proposed, which is based on the matching of both the group velocity and pulse front between signal and idler by the combination of the no collincar-phasc-match and pulse-front-till that is accomplished by angular dispersion of the interacting rays. By this Scheme, the phase mismatch to first order in frequency shift can be completely compensated, and then an ultra-broadband OPCPA is realized. It is shown that the phase mismatch to both first and second order can be completely compensated simultaneously in some cases, and this leads to an extremely broadband spectral width. Therefore the important criterion for constructing an ultra-broadband OPCPA that both pulse-front and group-velocity between signal and idler are exactly matched simultaneously. Finally, specific numerical calculations and simulations are presented for BBO-OPCPA with type-Ⅰ noncollinear angularly dispersed geometry.
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摘要 :
The aim of this study was to evaluate the anti-metastasis effects and the inhibition of the tube-like structure formation of human umbilical vein endothelial cells ECV304 of isoliquiritigenin and glabridin. The cell survival ratio...
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The aim of this study was to evaluate the anti-metastasis effects and the inhibition of the tube-like structure formation of human umbilical vein endothelial cells ECV304 of isoliquiritigenin and glabridin. The cell survival ratio of mice melanoma cells B16F1was measured by SRB assay, the lethality rate was tested by trypan blue exclusion test. The survival ratio of human umbilical vein endothelial cells ECV304 were measured by SRB and AO/EB assays.The migration of B16F1 cells and ECV304 cells were measured by scratch wound assay. The matrix metalloproteinase-2 (MMP-2) activity in B16F1 cells culture medium was measured by gelatin zymography and EL1SA methods. The inhibition on tube-like structure formation of human umbilical vein endothelial cells ECV304 were detected on artificial basilar membrane rebuilt by matrigel. Taken together, our data suggested that isoliquiritigenin and glabridin have strong anti-metastasis activities, in the same concentration, isoliquiritigenin has stronger function.
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摘要 :
In this paper, a parallel model for the detection and analysis of electrocardiogram (ECG) will be defined. First of all, the parameters of digital FIR filter are worked out, with the help of MATLAB. Before any parallel model b...
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In this paper, a parallel model for the detection and analysis of electrocardiogram (ECG) will be defined. First of all, the parameters of digital FIR filter are worked out, with the help of MATLAB. Before any parallel model being defined, the serial algorithms of detection and analysis of ECG are discussed. Then each serial algorithm will be parallelized to build our parallel model. At the end of this paper, an parallel program baseed on Message Passing Interface (MPI) would be used to validate the parallel model. The parallel computer, which we worked on, is an IBM cluster with 15 nodes. As shown in the experimental results, the efficiency of detection and analysis of ECG will be significantly improved, by using the paralle model.
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摘要 :
In this paper, a parallel model for the detection and analysis of electrocardiogram (ECG) will be defined. First of all, the parameters of digital FIR filter are worked out, with the help of MATLAB. Before any parallel model being...
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In this paper, a parallel model for the detection and analysis of electrocardiogram (ECG) will be defined. First of all, the parameters of digital FIR filter are worked out, with the help of MATLAB. Before any parallel model being defined, the serial algorithms of detection and analysis of ECG are discussed. Then each serial algorithm will be parallelized to build our parallel model. At the end of this paper, an parallel program baseed on Message Passing Interface (MPI) would be used to validate the parallel model The parallel computer, which we worked on, is an IBM cluster with 15 nodes. As shown in the experimental results, the efficiency of detection and analysis of ECG will be significantly improved, by using the paralle model.
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摘要 :
The situation of operating, aging, decommissioning and upgrading of relative research reactors, as well as the production of radioisotopes, the utilizations of radioisotopes were described here, Meanwhile, we are facing much more ...
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The situation of operating, aging, decommissioning and upgrading of relative research reactors, as well as the production of radioisotopes, the utilizations of radioisotopes were described here, Meanwhile, we are facing much more problems encountered in the years to come.
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