A spaceborne hard X-ray spectrometer, composed of an array of 99 scintillation detectors and associated readout electronics, has been developed for the hard X-ray imager(HXI). The HXI is one of the three payloads onbo...A spaceborne hard X-ray spectrometer, composed of an array of 99 scintillation detectors and associated readout electronics, has been developed for the hard X-ray imager(HXI). The HXI is one of the three payloads onboard the advanced space-based solar observatory(ASO-S), which is scheduled to be launched in early 2022 as the first Chinese solar satellite. LaBr3 scintillators and photomultiplier tubes with a super bialkali cathode are used to achieve an energy resolution better than 20% at 30 keV.Further, a new multi-channel charge-sensitive readout application-specific integrated circuit guarantees high-frequency data acquisition with low power consumption. This paper presents a detailed design of the spectrometer for the engineering model of the HXI and discusses its noise and linearity performance.展开更多
目的探究Zn_(x)Ni_(1-x)S@DOX纳米结构在肿瘤光热-化学疗法联合治疗中的应用,为肿瘤治疗方法的研究提供新思路。方法通过透射电子显微镜等方法对Zn_(x)Ni_(1-x)S纳米结构进行表征测试;通过红外热成像仪探究光热性能;通过荧光光谱仪研究...目的探究Zn_(x)Ni_(1-x)S@DOX纳米结构在肿瘤光热-化学疗法联合治疗中的应用,为肿瘤治疗方法的研究提供新思路。方法通过透射电子显微镜等方法对Zn_(x)Ni_(1-x)S纳米结构进行表征测试;通过红外热成像仪探究光热性能;通过荧光光谱仪研究了不同温度和不同pH条件下Zn_(x)Ni_(1-x)S@DOX纳米结构的药物释放情况;通过MTT实验探究Zn_(x)Ni_(1-x)S纳米结构的生物安全性及Zn_(x)Ni_(1-x)S@DOX纳米结构的体外抗肿瘤性能。结果所制备的Zn_(x)Ni_(1-x)S纳米结构分散性良好且尺寸均一;光热性能测试结果显示Zn x Ni 1-x S纳米结构具有良好的光热升温效果;Zn_(x)Ni_(1-x)S@DOX纳米结构的药物释放行为具有温度和pH响应性;细胞实验表明,Zn_(x)Ni_(1-x)S纳米结构对正常细胞无明显毒性,在近红外光照射下,Zn_(x)Ni_(1-x)S@DOX纳米结构能够显著地抑制肿瘤细胞的生长。结论Zn_(x)Ni_(1-x)S纳米结构是一种生物相容性良好的纳米材料,在此基础上构建的Zn_(x)Ni_(1-x)S@DOX纳米结构具有良好的抗肿瘤性能,能够用于肿瘤的光热-化学疗法联合治疗研究。展开更多
The influence of thermal treatment on the lux-ampere characteristics of polycrystalline films from the CdSe<sub>x</sub>S<sub>1-x</sub> solid solution obtained by the method of thermal evaporati...The influence of thermal treatment on the lux-ampere characteristics of polycrystalline films from the CdSe<sub>x</sub>S<sub>1-x</sub> solid solution obtained by the method of thermal evaporation in a vacuum has been investigated. It is shown that at low illumination intensities L μ of electrons increases with a power law μ ~ L<sup>γ</sup>, first with the exponent γ > 1, then with γ ≈ 0.5, and their concentration n almost does not change. Starting from the intensity L > 12 - 15 lx, the electron concentration increases strongly n ~ L<sup>β</sup> from β ≈ 3.0, and the parameters n and μ reach relatively high values ~(10<sup>15</sup> - 10<sup>16</sup>) sm<sup>-3</sup> and ~(150 - 200) sm<sup>2</sup>/V·s, however further, at L > 50 lx, a weak dependence of n(L) and μ(L) with β, γ < 1.0 is found. The obtained experimental results are interpreted on the basis of a model of a semiconductor film with intergranular potential barriers when the concentration and barrier mechanisms of photoconductivity operate simultaneously.展开更多
The chemisorbed structure for an aromatic molecule on a silicon surface plays an important part in promoting the development of organic semiconductor material science. The carbon K-shell x-ray photoelectron spectrosc...The chemisorbed structure for an aromatic molecule on a silicon surface plays an important part in promoting the development of organic semiconductor material science. The carbon K-shell x-ray photoelectron spectroscopy（XPS） and the x-ray absorption near-edge structure（XANES） spectra of the interfacial structure of an s-triazine molecule adsorbed on Si（100） surface have been performed by the first principles, and the landscape of the s-triazine molecule on Si（100） surface has been described in detail. Both the XPS and XANES spectra have shown their dependence on different structures for the pristine s-triazine molecule and its several possible adsorbed configurations. By comparison with the XPS spectra, the XANES spectra display the strongest structural dependency of all of the studied systems and thus could be well applied to identify the chemisorbed s-triazine derivatives. The exploration of spectral components originated from non-equivalent carbons in disparate local environments has also been implemented for both the XPS and XANES spectra of s-triazine adsorbed configurations.展开更多
Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle si...Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle size of semiconductor crystallites from X_ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength diraction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third_order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.展开更多
This paper studies chaos synchronization in the modified Chua ' s circuitwith nonlinear quadratic function x|x| using a unidirectional Linear coupling approach. A newsufficient condition is derived for chaos synch...This paper studies chaos synchronization in the modified Chua ' s circuitwith nonlinear quadratic function x|x| using a unidirectional Linear coupling approach. A newsufficient condition is derived for chaos synchronization between the two unidirectional coupledmodified Chua ' s circuits with x x I based on the Lyapunov stability theory. A simulation exampleis given for demonstration .展开更多
基金supported by the Strategic Priority Program Stage Ⅱ on Space Science of Chinese Academy of Sciences(No.XDA15320104)the National Natural Science Foundation of China(Nos.11703097,11427803,11820101002,11622327,11773087,U1631116,and 11803093)
文摘A spaceborne hard X-ray spectrometer, composed of an array of 99 scintillation detectors and associated readout electronics, has been developed for the hard X-ray imager(HXI). The HXI is one of the three payloads onboard the advanced space-based solar observatory(ASO-S), which is scheduled to be launched in early 2022 as the first Chinese solar satellite. LaBr3 scintillators and photomultiplier tubes with a super bialkali cathode are used to achieve an energy resolution better than 20% at 30 keV.Further, a new multi-channel charge-sensitive readout application-specific integrated circuit guarantees high-frequency data acquisition with low power consumption. This paper presents a detailed design of the spectrometer for the engineering model of the HXI and discusses its noise and linearity performance.
文摘目的探究Zn_(x)Ni_(1-x)S@DOX纳米结构在肿瘤光热-化学疗法联合治疗中的应用,为肿瘤治疗方法的研究提供新思路。方法通过透射电子显微镜等方法对Zn_(x)Ni_(1-x)S纳米结构进行表征测试;通过红外热成像仪探究光热性能;通过荧光光谱仪研究了不同温度和不同pH条件下Zn_(x)Ni_(1-x)S@DOX纳米结构的药物释放情况;通过MTT实验探究Zn_(x)Ni_(1-x)S纳米结构的生物安全性及Zn_(x)Ni_(1-x)S@DOX纳米结构的体外抗肿瘤性能。结果所制备的Zn_(x)Ni_(1-x)S纳米结构分散性良好且尺寸均一;光热性能测试结果显示Zn x Ni 1-x S纳米结构具有良好的光热升温效果;Zn_(x)Ni_(1-x)S@DOX纳米结构的药物释放行为具有温度和pH响应性;细胞实验表明,Zn_(x)Ni_(1-x)S纳米结构对正常细胞无明显毒性,在近红外光照射下,Zn_(x)Ni_(1-x)S@DOX纳米结构能够显著地抑制肿瘤细胞的生长。结论Zn_(x)Ni_(1-x)S纳米结构是一种生物相容性良好的纳米材料,在此基础上构建的Zn_(x)Ni_(1-x)S@DOX纳米结构具有良好的抗肿瘤性能,能够用于肿瘤的光热-化学疗法联合治疗研究。
文摘The influence of thermal treatment on the lux-ampere characteristics of polycrystalline films from the CdSe<sub>x</sub>S<sub>1-x</sub> solid solution obtained by the method of thermal evaporation in a vacuum has been investigated. It is shown that at low illumination intensities L μ of electrons increases with a power law μ ~ L<sup>γ</sup>, first with the exponent γ > 1, then with γ ≈ 0.5, and their concentration n almost does not change. Starting from the intensity L > 12 - 15 lx, the electron concentration increases strongly n ~ L<sup>β</sup> from β ≈ 3.0, and the parameters n and μ reach relatively high values ~(10<sup>15</sup> - 10<sup>16</sup>) sm<sup>-3</sup> and ~(150 - 200) sm<sup>2</sup>/V·s, however further, at L > 50 lx, a weak dependence of n(L) and μ(L) with β, γ < 1.0 is found. The obtained experimental results are interpreted on the basis of a model of a semiconductor film with intergranular potential barriers when the concentration and barrier mechanisms of photoconductivity operate simultaneously.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11874242,11804196,and 11804197)
文摘The chemisorbed structure for an aromatic molecule on a silicon surface plays an important part in promoting the development of organic semiconductor material science. The carbon K-shell x-ray photoelectron spectroscopy（XPS） and the x-ray absorption near-edge structure（XANES） spectra of the interfacial structure of an s-triazine molecule adsorbed on Si（100） surface have been performed by the first principles, and the landscape of the s-triazine molecule on Si（100） surface has been described in detail. Both the XPS and XANES spectra have shown their dependence on different structures for the pristine s-triazine molecule and its several possible adsorbed configurations. By comparison with the XPS spectra, the XANES spectra display the strongest structural dependency of all of the studied systems and thus could be well applied to identify the chemisorbed s-triazine derivatives. The exploration of spectral components originated from non-equivalent carbons in disparate local environments has also been implemented for both the XPS and XANES spectra of s-triazine adsorbed configurations.
文摘Semiconductor(Zn\-\%x\%Cd 1-x S) doped silica glasses were prepared by Sol_Gel process and \%in situ\% growth technique. The structure of the materials was characterized by X_ray diffraction technique, the particle size of semiconductor crystallites from X_ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength diraction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third_order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.
文摘This paper studies chaos synchronization in the modified Chua ' s circuitwith nonlinear quadratic function x|x| using a unidirectional Linear coupling approach. A newsufficient condition is derived for chaos synchronization between the two unidirectional coupledmodified Chua ' s circuits with x x I based on the Lyapunov stability theory. A simulation exampleis given for demonstration .
