This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferrom...This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferromagnetic environment. We have shown in this work that the character variability of the field induces oscillations amongst the eigen modes of the environment. This observation is made via the derivation of the transition probability density of state, a manner by which critical parameters (parameters where transition occur) of the system could be obtained as it shows resonance peak. We equally observed that the two different magnons modes resulting from the frequency splitting via the application of the time-varying external B-Field, exhibit each a resonant peak of similar amplitude at different temperature ranges. This additional information shows that the probability for the central spin system to remain in its initially prepared diabatic state is enhanced for some temperature ranges for the corresponding two magnon modes. Hence, these temperature ranges where the probability density is maximum could save as decoherence free environment;an important requirement for the implementation of quantum computation and information processing in solid state circuitry. The theoretical and numerical results presented for the decoherence time and the probability density are that of a decohered central electron spin coupled to an anti-ferromagnetic spin bath. The theory is based on a spin wave approximation and on the density matrix using both transformations of Bloch, Primakov and Bogoliobuv in the adiabatic limit.展开更多
The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF ...The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF generator. The azimuthal B-field in the channel of 0.5-1.5 kG was formed by a pulsed current from external capacitor bank. Control of the hydrogen gas pressure was provided by an electromagnetic puffvalve. The paper describes experimental devices and results on the generated plasma parameters as function of RF frequency, antenna voltage, pulse duration and puffgas pressure. When operating at-1 kG B-field, ambient gas pressure in the range of few -10 mTorr, and 5 kV antenna voltage at resonant frequency of 150 kHz, the plasma density range was （3-7）×10^12 cm3 with a temperature of a few eV.展开更多
目的:研究乳腺X射线摄影与B超联合鉴别诊断乳腺肿瘤的效能。方法:选取2020年3月—2023年3月无锡市人民医院收治的103例乳腺肿瘤患者开展试验。对所有受试者均开展B超检查,同时分别实施全视野数字乳腺X射线摄影(full-field digital mammo...目的:研究乳腺X射线摄影与B超联合鉴别诊断乳腺肿瘤的效能。方法:选取2020年3月—2023年3月无锡市人民医院收治的103例乳腺肿瘤患者开展试验。对所有受试者均开展B超检查,同时分别实施全视野数字乳腺X射线摄影(full-field digital mammography,FFDM)。将病理检查结果视作金标准,分析乳腺X光机与B超联合应用于乳腺肿瘤鉴别诊断中的效能。此外,对比FFDM与B超联合对不同直径乳腺恶性肿瘤的检出率。结果:病理检查结果显示,恶性肿瘤71例,良性肿瘤32例。FFDM检出恶性肿瘤63例,其中6例误诊,8例漏诊;B超检出恶性肿瘤58例,其中8例误诊,13例漏诊。将病理检查结果视作金标准,FFDM联合B超诊断乳腺恶性肿瘤的灵敏度、特异度及准确率分别为98.59%、96.88%、98.06%,均高于单纯FFDM检查的88.73%、81.25%、86.41%与单纯B超检查的81.69%、75.00%、79.61%,差异有统计学意义(P<0.05)。FFDM联合B超对<2 cm乳腺恶性肿瘤的检出率为97.14%,高于单纯FFDM检查的82.86%与单纯B超检查的77.14%,差异有统计学意义(P<0.05)。结论:FFDM与B超联合诊断乳腺肿瘤的效能较佳,且能够实现对直径<2 c m的微小病灶乳腺癌的诊断,具有较高的临床应用价值,值得推广应用。展开更多
文摘This present issue is an extension of the work of Y. Xiao-Zhong et al. who investigated the influence of constant external magnetic field on the decoherence of a central electron spin of atom coupled to an anti-ferromagnetic environment. We have shown in this work that the character variability of the field induces oscillations amongst the eigen modes of the environment. This observation is made via the derivation of the transition probability density of state, a manner by which critical parameters (parameters where transition occur) of the system could be obtained as it shows resonance peak. We equally observed that the two different magnons modes resulting from the frequency splitting via the application of the time-varying external B-Field, exhibit each a resonant peak of similar amplitude at different temperature ranges. This additional information shows that the probability for the central spin system to remain in its initially prepared diabatic state is enhanced for some temperature ranges for the corresponding two magnon modes. Hence, these temperature ranges where the probability density is maximum could save as decoherence free environment;an important requirement for the implementation of quantum computation and information processing in solid state circuitry. The theoretical and numerical results presented for the decoherence time and the probability density are that of a decohered central electron spin coupled to an anti-ferromagnetic spin bath. The theory is based on a spin wave approximation and on the density matrix using both transformations of Bloch, Primakov and Bogoliobuv in the adiabatic limit.
文摘The paper describes experiments on formation of a plasma channel with imbedded B-field for transporting high power ion beam. The plasma was generated with a 5-turn loop inductive antenna driven by an H-bridge type RF generator. The azimuthal B-field in the channel of 0.5-1.5 kG was formed by a pulsed current from external capacitor bank. Control of the hydrogen gas pressure was provided by an electromagnetic puffvalve. The paper describes experimental devices and results on the generated plasma parameters as function of RF frequency, antenna voltage, pulse duration and puffgas pressure. When operating at-1 kG B-field, ambient gas pressure in the range of few -10 mTorr, and 5 kV antenna voltage at resonant frequency of 150 kHz, the plasma density range was （3-7）×10^12 cm3 with a temperature of a few eV.
文摘目的:研究乳腺X射线摄影与B超联合鉴别诊断乳腺肿瘤的效能。方法:选取2020年3月—2023年3月无锡市人民医院收治的103例乳腺肿瘤患者开展试验。对所有受试者均开展B超检查,同时分别实施全视野数字乳腺X射线摄影(full-field digital mammography,FFDM)。将病理检查结果视作金标准,分析乳腺X光机与B超联合应用于乳腺肿瘤鉴别诊断中的效能。此外,对比FFDM与B超联合对不同直径乳腺恶性肿瘤的检出率。结果:病理检查结果显示,恶性肿瘤71例,良性肿瘤32例。FFDM检出恶性肿瘤63例,其中6例误诊,8例漏诊;B超检出恶性肿瘤58例,其中8例误诊,13例漏诊。将病理检查结果视作金标准,FFDM联合B超诊断乳腺恶性肿瘤的灵敏度、特异度及准确率分别为98.59%、96.88%、98.06%,均高于单纯FFDM检查的88.73%、81.25%、86.41%与单纯B超检查的81.69%、75.00%、79.61%,差异有统计学意义(P<0.05)。FFDM联合B超对<2 cm乳腺恶性肿瘤的检出率为97.14%,高于单纯FFDM检查的82.86%与单纯B超检查的77.14%,差异有统计学意义(P<0.05)。结论:FFDM与B超联合诊断乳腺肿瘤的效能较佳,且能够实现对直径<2 c m的微小病灶乳腺癌的诊断,具有较高的临床应用价值,值得推广应用。
