We report the production of^(39)K and^(87)Rb Bose–Einstein condensates(BECs)in the lowest hyperfine states|F=1,m_(F)=1 simultaneously.We collect atoms in bright/dark magneto-optical traps(MOTs)of^(39)K/^(87)Rb to ove...We report the production of^(39)K and^(87)Rb Bose–Einstein condensates(BECs)in the lowest hyperfine states|F=1,m_(F)=1 simultaneously.We collect atoms in bright/dark magneto-optical traps(MOTs)of^(39)K/^(87)Rb to overcome the light-assisted losses of^(39)K atoms.Gray molasses cooling on the D1 line of the^(39)K is used to effectively increase the phase density,which improves the loading efficiency of^(39)K into the quadrupole magnetic trap.Simultaneously,the normal molasses is employed for^(87)Rb.After the microwave evaporation cooling on^(87)Rb in the optically plugged magnetic trap,the atoms mixture is transferred to a crossed optical dipole trap,where the collisional properties of the two species in different combinations of the hyperfine states are studied.The dual species BECs of^(39)K and^(87)Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a_(KRb)=34 a_(0)(a_(0)is the Bohr radius)and the intraspecies scattering length a_K=20.05 a_(0).展开更多
We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating...We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating at the D_(1) and D_(2 )lines of^(87)Rb.The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field.The absorption imaging technique accurately reveals the EIA-like effect of the n-type system.This coherent effect in an n-type system is useful for optical storage,tunable optical switching,and so on.展开更多
We propose a new design scheme for a Booth encoder based on clocked transmission gate adiabatic logic(CTGAL). In the new design the structural complexity of the Booth encoder is reduced while the speed of the multipli...We propose a new design scheme for a Booth encoder based on clocked transmission gate adiabatic logic(CTGAL). In the new design the structural complexity of the Booth encoder is reduced while the speed of the multiplier is improved. The adiabatic two's complement multiplier-accumulator(MAC) is furthermore a design based on the CTGAL. The computer simulation results indicate that the designed circuit has the correct logic function and remarkably less energy consumption compared to that of the MAC based on complementary metal oxide semiconductor(CMOS) logic.展开更多
BACKGROUND Although long-term retention of a ventilation tube is required in many ear diseases,spontaneous removal of conventional ventilation tube is observed in patients within 3 to 12 mo.To address this issue,we ai...BACKGROUND Although long-term retention of a ventilation tube is required in many ear diseases,spontaneous removal of conventional ventilation tube is observed in patients within 3 to 12 mo.To address this issue,we aimed to determine a new method for long-term retention of the ventilation tube.AIM To explore the value of removing the biofilm for long-term retention of tympanostomy ventilation tubes.METHODS A case-control study design was used to evaluate the safety and effectiveness of long-term tube retention by directly removing the biofilm(via surgical exfoliation)in patients who underwent myringotomy with ventilation tube placement.The patients were randomly divided into two groups:Control group and treatment group.Patients in the treatment group underwent regular biofilm exfoliation surgery in the clinic,whereas those in the control group did not have their biofilm removed.Only conventional ventilation tubes were placed in this study.Outcome measures were tube position and patency.Tube retention time and any complications were documented.RESULTS Eight patients with biofilm removal and eight patients without biofilm removal as a control group were enrolled in the study.The tympanostomy tube retention time was significantly longer in the treatment group(43.5±26.4 mo)than in the control group(9.5±6.9 mo)(P=0.003).More tympanostomy tubes were found to be patent and in correct position in the treatment group during the follow-up intervals than in the control group(P=0.01).CONCLUSION Despite the use of short-term ventilation tubes,direct biofilm removal can be a well-tolerated and effective treatment for long-term tube retention of tympanostomy ventilation tubes in patients who underwent myringotomy.展开更多
Valley filter is a promising device for producing valley polarized current in graphene-like two-dimensional honeycomb lattice materials.The relatively large spin-orbit coupling in silicene contributes to remarkable qu...Valley filter is a promising device for producing valley polarized current in graphene-like two-dimensional honeycomb lattice materials.The relatively large spin-orbit coupling in silicene contributes to remarkable quantum spin Hall effect,which leads to distinctive valley-dependent transport properties compared with intrinsic graphene.In this paper,quantized conductance and valley polarization in silicene nanoconstrictions are theoretically investigated in quantum spin-Hall insulator phase.Nearly perfect valley filter effect is found by aligning the gate voltage in the central constriction region.However,the valley polarization plateaus are shifted with the increase of spin-orbit coupling strength,accompanied by smooth variation of polarization reversal.Our findings provide new strategies to control the valley polarization in valleytronic devices.展开更多
We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation（BEC）of^（87）Rb in an optical dipole trap.As a comparison,we shine a continuous-wave s...We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation（BEC）of^（87）Rb in an optical dipole trap.As a comparison,we shine a continuous-wave singlefrequency Ti：sapphire laser,an external-cavity diode laser and a phase-locked diode laser on BEC.We measure the heating and lifetime of BEC in two different hyperfine states：｜F=2,m_F=2〉and｜F=1,m_F=1〉.Due to the narrow linewidth and small phase noise,the continuous-wave single-frequency Ti：sapphire laser has less influence on the lifetime of^（87）Rb BEC than the external-cavity diode laser.To reduce the phase noise of the external-cavity diode laser,we use an optical phase-locked loop for the external-cavity diode laser to be locked on a Ti：sapphire laser.The lifetime of BEC is increased when applfying the phase-Jocked diode laser in contrast with the external-cavity diode laser.展开更多
We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit...We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.展开更多
基金supported by the National Key R&D Program of China(Grants Nos.2016YFA0301602 and 2018YFA0307601)the National Natural Science Foundation of China(Grant Nos.11974224,11704234,11804203,12034011,12022406,12004229,and 92065108)+1 种基金the Fund for Shanxi“1331 Project”Key Subjects Constructionthe Program of Youth Sanjin Scholar。
文摘We report the production of^(39)K and^(87)Rb Bose–Einstein condensates(BECs)in the lowest hyperfine states|F=1,m_(F)=1 simultaneously.We collect atoms in bright/dark magneto-optical traps(MOTs)of^(39)K/^(87)Rb to overcome the light-assisted losses of^(39)K atoms.Gray molasses cooling on the D1 line of the^(39)K is used to effectively increase the phase density,which improves the loading efficiency of^(39)K into the quadrupole magnetic trap.Simultaneously,the normal molasses is employed for^(87)Rb.After the microwave evaporation cooling on^(87)Rb in the optically plugged magnetic trap,the atoms mixture is transferred to a crossed optical dipole trap,where the collisional properties of the two species in different combinations of the hyperfine states are studied.The dual species BECs of^(39)K and^(87)Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a_(KRb)=34 a_(0)(a_(0)is the Bohr radius)and the intraspecies scattering length a_K=20.05 a_(0).
基金the National Key Research and Development Program of China under Grant No 2016YFA0301602the National Natural Science Foundation of China under Grant Nos 11474188 and 11704234the Fund for Shanxi‘1331 Project’Key Subjects Construction,and the Program of Youth Sanjin Scholar
文摘We study the electromagnetically induced-absorption-like(EIA-like)effect for an n-type system in an^(87)Rb Bose–Einstein condensate(BEC)using the absorption imaging technique for coupling and driving lasers operating at the D_(1) and D_(2 )lines of^(87)Rb.The coherent effect is probed by measuring the number of atoms remaining after the BEC is exposed to strong driving fields and a weak probe field.The absorption imaging technique accurately reveals the EIA-like effect of the n-type system.This coherent effect in an n-type system is useful for optical storage,tunable optical switching,and so on.
基金supported by the National Natural Science Foundation of China (No. 60776022)the Science and Technology Fund of Zhejiang Province (No. 2008C21166)+3 种基金the Key Scientific Research Fund of the Department of Education of Zhejiang Province (No. 20061666)the Professor Fund (No. JSL2007001)the Scientific Research Fund (No. XK0610030)the K. C. Wong Magna Fund in Ningbo University, China
文摘We propose a new design scheme for a Booth encoder based on clocked transmission gate adiabatic logic(CTGAL). In the new design the structural complexity of the Booth encoder is reduced while the speed of the multiplier is improved. The adiabatic two's complement multiplier-accumulator(MAC) is furthermore a design based on the CTGAL. The computer simulation results indicate that the designed circuit has the correct logic function and remarkably less energy consumption compared to that of the MAC based on complementary metal oxide semiconductor(CMOS) logic.
基金Supported by Shanghai Leadership Talent Training Plan,No. 2017062the Key Project of Shanghai Jiao Tong University Medicine Science and Engineering Interdisciplinary Foundation,No. YG2016ZD02+3 种基金Shanghai Municipal Education Commission-Gaofeng Clinical Medicine Grant Support,No.20152233Multi-Center Clinical Research Plan of Medical College of Shanghai Jiao Tong University,No. DLY201823the Clinical Research Plan of Shanghai Shen Kang Hospital Development Center,No. 16CR4022A and No.16CR3041ANational Natural Science Foundation of China,No.81974142.
文摘BACKGROUND Although long-term retention of a ventilation tube is required in many ear diseases,spontaneous removal of conventional ventilation tube is observed in patients within 3 to 12 mo.To address this issue,we aimed to determine a new method for long-term retention of the ventilation tube.AIM To explore the value of removing the biofilm for long-term retention of tympanostomy ventilation tubes.METHODS A case-control study design was used to evaluate the safety and effectiveness of long-term tube retention by directly removing the biofilm(via surgical exfoliation)in patients who underwent myringotomy with ventilation tube placement.The patients were randomly divided into two groups:Control group and treatment group.Patients in the treatment group underwent regular biofilm exfoliation surgery in the clinic,whereas those in the control group did not have their biofilm removed.Only conventional ventilation tubes were placed in this study.Outcome measures were tube position and patency.Tube retention time and any complications were documented.RESULTS Eight patients with biofilm removal and eight patients without biofilm removal as a control group were enrolled in the study.The tympanostomy tube retention time was significantly longer in the treatment group(43.5±26.4 mo)than in the control group(9.5±6.9 mo)(P=0.003).More tympanostomy tubes were found to be patent and in correct position in the treatment group during the follow-up intervals than in the control group(P=0.01).CONCLUSION Despite the use of short-term ventilation tubes,direct biofilm removal can be a well-tolerated and effective treatment for long-term tube retention of tympanostomy ventilation tubes in patients who underwent myringotomy.
基金the Natural Science Foundation of Zhejiang Province,China(Grant No.LQ17A040001)the National Natural Science Foundation of China(Grant Nos.61874078,11647046,and 61904125)+1 种基金the National Key Research and Development Program of China(Grant No.2018YFB2202100)the Science and Technology Planning Project of Wenzhou City(Grant No.G20180012).
文摘Valley filter is a promising device for producing valley polarized current in graphene-like two-dimensional honeycomb lattice materials.The relatively large spin-orbit coupling in silicene contributes to remarkable quantum spin Hall effect,which leads to distinctive valley-dependent transport properties compared with intrinsic graphene.In this paper,quantized conductance and valley polarization in silicene nanoconstrictions are theoretically investigated in quantum spin-Hall insulator phase.Nearly perfect valley filter effect is found by aligning the gate voltage in the central constriction region.However,the valley polarization plateaus are shifted with the increase of spin-orbit coupling strength,accompanied by smooth variation of polarization reversal.Our findings provide new strategies to control the valley polarization in valleytronic devices.
基金Supported by the National Key Research and Development Program of China under Grant Nos 2016YFA0301600 and 2016YFA0301602the National Natural Science Foundation of China under Grant Nos 11234008,11474188 and 11704234the Fund for Shanxi'1331 Project'Key Subjects Construction
文摘We study the influence of the phase noises of far detuning single frequency lasers on the lifetime of Bose-Einstein condensation（BEC）of^（87）Rb in an optical dipole trap.As a comparison,we shine a continuous-wave singlefrequency Ti：sapphire laser,an external-cavity diode laser and a phase-locked diode laser on BEC.We measure the heating and lifetime of BEC in two different hyperfine states：｜F=2,m_F=2〉and｜F=1,m_F=1〉.Due to the narrow linewidth and small phase noise,the continuous-wave single-frequency Ti：sapphire laser has less influence on the lifetime of^（87）Rb BEC than the external-cavity diode laser.To reduce the phase noise of the external-cavity diode laser,we use an optical phase-locked loop for the external-cavity diode laser to be locked on a Ti：sapphire laser.The lifetime of BEC is increased when applfying the phase-Jocked diode laser in contrast with the external-cavity diode laser.
基金supported by the Science and Technology Innovation 2030-Major Project(Grant No.2021ZD0302003)the National Key Research and Development Program of China(Grant Nos.2022YFA1404101,2021YFA1401700,and 2018YFA0307601)+1 种基金the National Natural Science Foundation of China(Grant Nos.12034011,92065108,11974224,12022406,and 12004229)the Fund for Shanxi 1331 Project Key Subjects Construction,and Tencent(Xplorer Prize)。
文摘We report on the efficient creation of a sample of 2.2×10^(4)fermionic polar molecules^(23)Na^(40)K in their rovibrational ground state X^(1)∑^(+)|v=0,J=0>at 247 nK via an intermediate state of the spin-orbit coupled complex B^(1)Π|v=4〉~C^(3)∑^(+)|v=25〉.Compared with the intermediate state of the coupled complex B^(1)Π|v=12〉^(c)^(3)∑^(+)|v=35〉,this intermediate state has the larger Franck-Condon factors for up-and down-leg coupling of stimulated Raman adiabatic passage(STIRAP).We demonstrate this two-photon pathway to the^(23)Na^(40)K ground state molecules and find that the one-way STIRAP transfer efficiency reaches75%.The molecules^(23)Na^(40)K in their rovibrational ground state are an ideal candidate for the quantum simulation and quantum information of ultracold molecules with long-range interaction.
