We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The ...We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The loss rates from the magneto-optic trap and the pure magnetic trap are compared and show significant differences.The collision cross sections as a function of trap depth for helium gas are obtained.These findings are significant for extracting the information about the different cross sections when the trap depth is changed.展开更多
We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Phy...We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Physics Letters[28(4)(2011)043401].The first author,Jicheng Wang,had participated in related research with Professor Kirk Madison’s group at the Department of Physics&Astronomy at the University of British Columbia,Canada from September 2008 to February 2010.Even though consent had been granted for some of the experimental data to be used by Jicheng Wang in his own thesis,its publication had not been authorized.We apologize to Professor K.Madison for the misunderstanding,and to Chinese Physics Letters and the readers of Chinese Physics Letters for any inconvenience this mistake may have caused.展开更多
A generalized type of spiral Bessel beam has been demonstrated by using a spatially displaced helical axicon （HA）. The topological charge of the spiraling Bessel beams is determined by the order of the input Laguerr...A generalized type of spiral Bessel beam has been demonstrated by using a spatially displaced helical axicon （HA）. The topological charge of the spiraling Bessel beams is determined by the order of the input Laguerre Gaussian （LG） beam and the topological charge of the HA. The obtained spiraling Bessel beams have an LG type of modulation along their propagation direction and exhibit annihilation-reconstruction properties. Theoretical analysis is presented, including that of the stability, propagation distance, topological charge, and spiraling dynamic characteristics. The mathematical and numerical results show that the propagation distance and helical revolution of the spiraling Bessel beams can be controlled through choosing appropriate radius of the HA.展开更多
Nonlinear absorption in a novel metallophthalocynine compound (C_(12)H_(25)O)_(8)PcPb was investigated by the Zscan technique with the irradiation of 8ns laser pulses at the wavelength of 532nm. The large optical limi...Nonlinear absorption in a novel metallophthalocynine compound (C_(12)H_(25)O)_(8)PcPb was investigated by the Zscan technique with the irradiation of 8ns laser pulses at the wavelength of 532nm. The large optical limiting response was observed. The nonlinear absorption cross section was obtained by the simulation with a simplified rate equation model in which excited triplet-triplet state absorption is dominant. The excited-state absorption cross section and its effective ratio to the ground-state absorption cross section are larger than those of C_(60). The attenuation factor for (C_(12)H_(25)O)_(8)PcPb is 2.5 times larger than that of C_(60), which is induced by the heavy atom lead interposition.展开更多
Making use of a new generalized ansatz, we present a new generalized extended F-expansion method for constructing the exact solutions of nonlinear partial differential equations in a unified way. Applying the generali...Making use of a new generalized ansatz, we present a new generalized extended F-expansion method for constructing the exact solutions of nonlinear partial differential equations in a unified way. Applying the generalized method with the aid of Maple, we consider the （2＋1）-dimentional breaking soliton equation. As a result, we successfully obtain some new and more general solutions including Jacobi elliptic function solutions, soliton-like solutions, trigonometric function solutions, and so on. As an illustrative sampler the properties of some soliton solutions for the breaking soliton equation are shown by some figures. Our method can also be applied to other partial differential equations.展开更多
We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing...We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing the concurrence.We examine the influence of the initial mean photon number,the relative phase and the amplitude of the two qubits on the time evolution of entanglement.The results show that the initial mean photon number,the relative phase and the amplitude of the two qubits play an important role in the evolution of entanglement.展开更多
Objective： To observe the clinical effects of comprehensive treatmenton cutaneous region for low back pain. Methods： One hundred and twenty outpatients with low back pain who met the diagnostic criteria were random...Objective： To observe the clinical effects of comprehensive treatmenton cutaneous region for low back pain. Methods： One hundred and twenty outpatients with low back pain who met the diagnostic criteria were randomly divided into a cutaneous region group or a medication group, 60 cases in each group. The cases in the cutaneous region group were treated by Nie-pinching up the skin of the lumbosacral region, cupping and acupuncture. Those in the medication group were treated by oral administration of Celecoxib capsule. The visual analogue scale （VAS） and Oswestry disability index （ODI） were used to assess the therapeutic effects. Results： After treatment, the VAS scores of both groups were different from those before treatment, showing statistical significances （allP＆lt;0.01）. The D-valuse of VAS scores of both groups were different from those before treatment, showing statistical significances （allP＆lt;0.01）. The D-value of OID scores in the cutaneous region group was significantly different from that in the medication group（P＆lt;0.01）. After treatment, the total effective rate was 91.7% in the cutaneous region group versus 76.7% in the medication group, there was a significant difference in comparing the clinical effect （P＆lt;0.01）. Conclusion： Both comprehensive treatment on the cutaneous region and Celecoxib capsule can obviously relieve low back pain. But comprehensive treatment on the cutaneous region is better than Celecoxib capsule in the therapeutic effects.展开更多
基金Supported by the National Basic Research Program of China under Grant No 2011CB301801the National Natural Science Foundation of China under Grant No 10974039jointly supported by the State Scholarship of the China Scholarship Council for Study Abroad.
文摘We present the measurements and calculations of the absolute total collision cross sections for a room-temperature gas of helium using^(87)Rb atoms confined in either a magneto-optic or a magnetic quadrupole trap.The loss rates from the magneto-optic trap and the pure magnetic trap are compared and show significant differences.The collision cross sections as a function of trap depth for helium gas are obtained.These findings are significant for extracting the information about the different cross sections when the trap depth is changed.
文摘We announce the withdrawal of the article entitled“Measurement of Absolute Atomic Collision Cross Section with Helium Using 87Rb Atoms Confined in Magneto-Optic and Magnetic Traps”,which was published in Chinese Physics Letters[28(4)(2011)043401].The first author,Jicheng Wang,had participated in related research with Professor Kirk Madison’s group at the Department of Physics&Astronomy at the University of British Columbia,Canada from September 2008 to February 2010.Even though consent had been granted for some of the experimental data to be used by Jicheng Wang in his own thesis,its publication had not been authorized.We apologize to Professor K.Madison for the misunderstanding,and to Chinese Physics Letters and the readers of Chinese Physics Letters for any inconvenience this mistake may have caused.
基金Project supported by the National Basic Research Program of China(Grant No.2011CB301801)the National Natural Science Foundation of China(Grant Nos.10974039,11047153,10904027,61008039,and 11104049)+1 种基金the Doctoral Program of Higher Education of China(Grant No.20102302120009)the Fundamental Research Funds for the Central Universities of China(Grant No.2009038)
文摘A generalized type of spiral Bessel beam has been demonstrated by using a spatially displaced helical axicon （HA）. The topological charge of the spiraling Bessel beams is determined by the order of the input Laguerre Gaussian （LG） beam and the topological charge of the HA. The obtained spiraling Bessel beams have an LG type of modulation along their propagation direction and exhibit annihilation-reconstruction properties. Theoretical analysis is presented, including that of the stability, propagation distance, topological charge, and spiraling dynamic characteristics. The mathematical and numerical results show that the propagation distance and helical revolution of the spiraling Bessel beams can be controlled through choosing appropriate radius of the HA.
基金Supported by the National Natural Science Foundation of China under Grant Nos.292682001 and 29832030。
文摘Nonlinear absorption in a novel metallophthalocynine compound (C_(12)H_(25)O)_(8)PcPb was investigated by the Zscan technique with the irradiation of 8ns laser pulses at the wavelength of 532nm. The large optical limiting response was observed. The nonlinear absorption cross section was obtained by the simulation with a simplified rate equation model in which excited triplet-triplet state absorption is dominant. The excited-state absorption cross section and its effective ratio to the ground-state absorption cross section are larger than those of C_(60). The attenuation factor for (C_(12)H_(25)O)_(8)PcPb is 2.5 times larger than that of C_(60), which is induced by the heavy atom lead interposition.
基金The project supported partially by the State Key Basic Research Program of China under Grant No. 2004 CB 318000The authors would like to thank the referee for his/her valuable suggestions.
文摘Making use of a new generalized ansatz, we present a new generalized extended F-expansion method for constructing the exact solutions of nonlinear partial differential equations in a unified way. Applying the generalized method with the aid of Maple, we consider the （2＋1）-dimentional breaking soliton equation. As a result, we successfully obtain some new and more general solutions including Jacobi elliptic function solutions, soliton-like solutions, trigonometric function solutions, and so on. As an illustrative sampler the properties of some soliton solutions for the breaking soliton equation are shown by some figures. Our method can also be applied to other partial differential equations.
基金by the National Basic Research Program of China under Grant No 2011CB301801 and the National Natural Science Foundation of China under Grant No 10974039.
文摘We consider a model which consists of two coupled superconducting charge qubits by sharing a large Josephson junction.The time evolution of entanglement between two Josephson charge qubits is investigated by employing the concurrence.We examine the influence of the initial mean photon number,the relative phase and the amplitude of the two qubits on the time evolution of entanglement.The results show that the initial mean photon number,the relative phase and the amplitude of the two qubits play an important role in the evolution of entanglement.
基金supported by the Key Project of Scientific Research Plan of State Administration of Traditional Chinese Medicine of Hunan Province (No. 2010008)
文摘Objective： To observe the clinical effects of comprehensive treatmenton cutaneous region for low back pain. Methods： One hundred and twenty outpatients with low back pain who met the diagnostic criteria were randomly divided into a cutaneous region group or a medication group, 60 cases in each group. The cases in the cutaneous region group were treated by Nie-pinching up the skin of the lumbosacral region, cupping and acupuncture. Those in the medication group were treated by oral administration of Celecoxib capsule. The visual analogue scale （VAS） and Oswestry disability index （ODI） were used to assess the therapeutic effects. Results： After treatment, the VAS scores of both groups were different from those before treatment, showing statistical significances （allP＆lt;0.01）. The D-valuse of VAS scores of both groups were different from those before treatment, showing statistical significances （allP＆lt;0.01）. The D-value of OID scores in the cutaneous region group was significantly different from that in the medication group（P＆lt;0.01）. After treatment, the total effective rate was 91.7% in the cutaneous region group versus 76.7% in the medication group, there was a significant difference in comparing the clinical effect （P＆lt;0.01）. Conclusion： Both comprehensive treatment on the cutaneous region and Celecoxib capsule can obviously relieve low back pain. But comprehensive treatment on the cutaneous region is better than Celecoxib capsule in the therapeutic effects.
