Si-based optical position-sensitive detectors(PSDs)have stimulated the interest of researchers due to their wide range of practical applications.However,due to the rigidity and fragility of Si crystals,the application...Si-based optical position-sensitive detectors(PSDs)have stimulated the interest of researchers due to their wide range of practical applications.However,due to the rigidity and fragility of Si crystals,the applications of flexible PSDs have been limited.Therefore,we presented a flexible broadband PSD based on a WS_(2)/Si heterostructure for the first time.A scalable sputtering method was used to deposit WS_(2)thin films onto the etched ultrathin crystalline Si surface.The fabricated flexible PSD device has a broad spectral response in the wavelength range of 450-1350 nm,with a high position sensitivity of~539.8 mV·mm^(−1)and a fast response of 2.3μs,thanks to the strong light absorption,the built-in electrical field at the WS_(2)/Si interface,and facilitated transport.Furthermore,mechanical-bending tests revealed that after 200 mechanical-bending cycles,the WS_(2)/Si PSDs have excellent mechanical flexibility,stability,and durability,demonstrating the great potential in wearable PSDs with competitive performance.展开更多
目的:探究双层探测器光谱CT多定量参数术前对胃癌Lauren分型的诊断价值。方法:收集48例术前在双层探测器光谱CT上行腹部增强检查且术后病理确诊为胃腺癌的患者,获取双层探测器光谱CT多定量参数及术后病理资料。按Lauren分型将入组病例...目的:探究双层探测器光谱CT多定量参数术前对胃癌Lauren分型的诊断价值。方法:收集48例术前在双层探测器光谱CT上行腹部增强检查且术后病理确诊为胃腺癌的患者,获取双层探测器光谱CT多定量参数及术后病理资料。按Lauren分型将入组病例分为三组,其中弥漫型17例,混合型21例,肠型10例。通过后处理软件得到碘浓度图及有效原子序数图,测量胃癌病灶及同层面腹主动脉期及静脉期的碘浓度及有效原子序数,计算标准化碘浓度及标准化有效原子序数。比较增强各期不同分型间各参数值的差异,对有统计学意义的参数绘制其受试者工作特征(receiver operating characteristic,ROC)曲线评估各参数的诊断效能,按约登指数为最大原则得出诊断阈值及曲线下面积(area under curve,AUC)。结果:弥漫型胃癌的各项参数值均高于肠型及混合型胃癌,弥漫型与混合型、弥漫型与肠型差异均具有统计学意义(P<0.05),而混合型与肠型除动脉期标准化有效原子序数差异具有统计学意义(P<0.05)外,余各参数值差异均无统计学意义(P>0.05)。动脉期及静脉期碘浓度、标准化碘浓度、有效原子序数及标准化有效原子序数诊断弥漫型胃癌的AUC分别为0.758、0.819、0.739、0.861及0.889、0.825、0.832、0.881;诊断阈值分别为1.26、0.12、7.91、0.75及1.81、0.52、8.28、0.91;动静脉期碘浓度、标准化碘浓度中,静脉期AUC最大;动静脉期有效原子序数、标准化有效原子序数中,静脉期AUC最大。结论:双层探测器光谱CT碘浓度及有效原子序数可为术前鉴别胃癌Lauren分型提供更多信息,具有一定的临床价值。展开更多
This paper focuses on the relic gravity waves produced during the transition from a radiation-dominated inflationary phase to a dust-dominated Friedman-Robertson-Walker-type expansion. We discuss how to investigate th...This paper focuses on the relic gravity waves produced during the transition from a radiation-dominated inflationary phase to a dust-dominated Friedman-Robertson-Walker-type expansion. We discuss how to investigate the spectral energy density by the latest space-based CWs detectors at f =0.1 Hz （i.e. DECICO）. In the case of power-law and exponential inflation, we apply the cross-correlation method to the latest detector and get the time dependence of the very early Hubble pararneter.展开更多
基金supported by the National Natural Science Foundation of China(No.51972341)the Shandong Natural Science Foundation,China(No.ZR2020MA069).
文摘Si-based optical position-sensitive detectors(PSDs)have stimulated the interest of researchers due to their wide range of practical applications.However,due to the rigidity and fragility of Si crystals,the applications of flexible PSDs have been limited.Therefore,we presented a flexible broadband PSD based on a WS_(2)/Si heterostructure for the first time.A scalable sputtering method was used to deposit WS_(2)thin films onto the etched ultrathin crystalline Si surface.The fabricated flexible PSD device has a broad spectral response in the wavelength range of 450-1350 nm,with a high position sensitivity of~539.8 mV·mm^(−1)and a fast response of 2.3μs,thanks to the strong light absorption,the built-in electrical field at the WS_(2)/Si interface,and facilitated transport.Furthermore,mechanical-bending tests revealed that after 200 mechanical-bending cycles,the WS_(2)/Si PSDs have excellent mechanical flexibility,stability,and durability,demonstrating the great potential in wearable PSDs with competitive performance.
文摘目的:探究双层探测器光谱CT多定量参数术前对胃癌Lauren分型的诊断价值。方法:收集48例术前在双层探测器光谱CT上行腹部增强检查且术后病理确诊为胃腺癌的患者,获取双层探测器光谱CT多定量参数及术后病理资料。按Lauren分型将入组病例分为三组,其中弥漫型17例,混合型21例,肠型10例。通过后处理软件得到碘浓度图及有效原子序数图,测量胃癌病灶及同层面腹主动脉期及静脉期的碘浓度及有效原子序数,计算标准化碘浓度及标准化有效原子序数。比较增强各期不同分型间各参数值的差异,对有统计学意义的参数绘制其受试者工作特征(receiver operating characteristic,ROC)曲线评估各参数的诊断效能,按约登指数为最大原则得出诊断阈值及曲线下面积(area under curve,AUC)。结果:弥漫型胃癌的各项参数值均高于肠型及混合型胃癌,弥漫型与混合型、弥漫型与肠型差异均具有统计学意义(P<0.05),而混合型与肠型除动脉期标准化有效原子序数差异具有统计学意义(P<0.05)外,余各参数值差异均无统计学意义(P>0.05)。动脉期及静脉期碘浓度、标准化碘浓度、有效原子序数及标准化有效原子序数诊断弥漫型胃癌的AUC分别为0.758、0.819、0.739、0.861及0.889、0.825、0.832、0.881;诊断阈值分别为1.26、0.12、7.91、0.75及1.81、0.52、8.28、0.91;动静脉期碘浓度、标准化碘浓度中,静脉期AUC最大;动静脉期有效原子序数、标准化有效原子序数中,静脉期AUC最大。结论:双层探测器光谱CT碘浓度及有效原子序数可为术前鉴别胃癌Lauren分型提供更多信息,具有一定的临床价值。
基金Supported by the National Basic Research Program of China under Grant No. 2003 CB 716300the National Natural Science Foundation of China under Grant No. 10575140+2 种基金CAEP Foundation under Grant No. 2008T0401 and 2008T0402Chongqing University Postgraduates Science and Innovation Fund, Project No. 200811B1A0100299Chinese State Scholarship Fund
文摘This paper focuses on the relic gravity waves produced during the transition from a radiation-dominated inflationary phase to a dust-dominated Friedman-Robertson-Walker-type expansion. We discuss how to investigate the spectral energy density by the latest space-based CWs detectors at f =0.1 Hz （i.e. DECICO）. In the case of power-law and exponential inflation, we apply the cross-correlation method to the latest detector and get the time dependence of the very early Hubble pararneter.
