|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Broadband rhenium disulfide optical modulator for solid-state lasers显示文摘Rhenium disulfide(ReS_2), a member of group Ⅶ transition metal dichalcogenides(TMDs), has attracted increasing attention because of its unique distorted 1T structure and electronic and optical properties, which are much different from those of group Ⅵ TMDs(MoS_2, WS_2, MoSe_2, WSe_2, etc.). It has been proved that bulk ReS_2 behaves as a stack of electronically and vibrationally decoupled monolayers, which offers remarkable possibilities to prepare a monolayer ReS_2 facilely and offers a novel platform to study photonic properties of TMDs. However,due to the large and layer-independent bandgap, the nonlinear optical properties of ReS_2 from the visible to midinfrared spectral range have not yet been investigated. Here, the band structure of ReS_2 with the introduction of defects is simulated by the ab initio method, and the results indicate that the bandgap can be reduced from 1.38 to 0.54 eV with the introduction of defects in a suitable range. In the experiment, using a bulk ReS_2 with suitable defects as the raw material, a few-layered broadband ReS_2 saturable absorber(SA) is prepared by the liquid phase exfoliation method. Using the as-prepared ReS_2 SA, passively Q-switched solid-state lasers at wavelengths of 0.64,1.064, and 1.991 μm are investigated systematically. Moreover, with cavity design, a femtosecond passively modelocked laser at 1.06 μm is successfully realized based on the as-prepared ReS_2 SA for the first time. The results present a promising alternative for a rare broadband optical modulator and indicate the potential of ReS_2 in generating Q-switched and mode-locked pulsed lasers. It is further anticipated that this work may be helpful for the design of 2D optoelectronic devices with variable bandgaps. | XIANCUI SU BAITAO ZHANG YIRAN WANG GUANBAI HE GUORU LI NA LIN KEJIAN YANG JINGLIANG HE SHANDE LIU | 2018 | Photonics Research2018，6，6： | 4 |
| 2 | Revisiting the late Permian coal from the Huayinshang, Sichuan, southwestern China: Enrichment and occurrence modes of minerals and trace elements显示文摘 | Shifeng Dai Yangbing Luo Vladimir V. Seredin Colin R. Ward James C. Hower Lei Zhao Shande Liu Cunliang Zhao Heming Tian Jianhua Zou | 2013 | International Journal of Coal Geology2013，，： | 3 |
| 3 | Fast multipole accelerated boundary element method for the Helmholtz equation in acoustic scattering problems显示文摘We apply the fast multipole method (FMM) accelerated boundary element method (BEM) for the three-dimensional (3D) Helmholtz equation, and as a result, large-scale acoustic scattering problems involving 400000 elements are solved efficiently. This is an extension of the fast multipole BEM for two-dimensional (2D) acoustic problems developed by authors recently. Some new improvements are obtained. In this new technique, the improved Burton-Miller formulation is employed to over-come non-uniqueness difficulties in the conventional BEM for exterior acoustic problems. The computational efficiency is further improved by adopting the FMM and the block diagonal preconditioner used in the generalized minimum residual method (GMRES) iterative solver to solve the system matrix equation. Numerical results clearly demonstrate the complete reliability and efficiency of the proposed algorithm. It is potentially useful for solving large-scale engineering acoustic scattering problems. | LI ShanDe GAO GuiBing HUANG QiBai LIU WeiQi CHEN Jun | 2011 | Science China(Physics,Mechanics & Astronomy)2011，54，8： | 2 |
| 4 | Relationship between Thermal Metamorphism of Coal and the Periodic Variation Law of Geochemical Behavior of Elements:A Study on the C2 Coal Seam in the Fengfeng Mining Area of the Handan Coalfield in Hebei,China显示文摘This study highlights the response of the periodic variation of the geochemical behavior of elements to the thermal metamorphism of coal by considering the differentiation mode and differentiation degree of elements of the C2 coal seam in the Fengfeng mining area of the Handan Coalfield in Hebei,China.The periodic variation of the geochemical behavior of elements was observed to change towards a certain direction as the degree of metamorphism of a geological body increased.Based on the coincidence degree(or similarity degree)between the geochemical behavior of elements and periodic variation of elements,the 57 elements in this study were divided into two levels.The periodic variation of the geochemical behavior of first-level elements was largely synchronous with that of their first ionization energy,suggesting that only one differentiation mode exists and the elements are mainly inorganically associated.The differentiation mode of the second-level elements deviated to a certain extent from their first ionization energy;the larger the deviation,the more complicated and diverse was the differentiation mode.Among the second-level elements,the grade of coal metamorphism has evident and intuitive effects on the proportion of elements with particular structural features,such as the 4q+3 type of elements and the odd-odd elements.In addition,the distribution of elements in organic and inorganic matter within coal are subject to the structural features of the elements.The differentiation mode and differentiation intensity of elements could be characterized by the hierarchical parameter and differentiation intensity.The hierarchical parameter and differentiation intensity of certain elements showed a good positive or negative correlation with R_(max) in coal.The 57 elements in this study were quantitatively ordered according to the degree of magmatic hydrothermal fluid influence and thermal metamorphism of coal through graphs depicting the goodness of fit,correlation coefficient with R_(max),and differentiation intensity.The results of this study are consistent with the results of previous field research,illustrating the scientific significance and application value of this study on the periodic variation of the geochemical behavior of elements. | YANG Jianye QIN Shenjun ZHANG Weiguo LIU Shande XU Fei | 2021 | Acta Geologica Sinica(English Edition)2021，95，5： | 1 |
| 5 | Effect of seed orientations on crystallographic texture control in faceted Al2O3/YAG eutectic ceramic during directional solidification显示文摘Crystallographic texture control is a major challenge in directionally solidified multiphase eutectic ceramics with complex faceted growth characteristics.In this study,the Czochralski(CZ)technique is proposed to prepare eutectic single crystal ceramic with large size(30 mm×125 mm).A highly oriented and unique texture of Al_(2)O_(3)/Y_(3)Al_(5)O_(12)(YAG)eutectic ceramic is formed via the 112¯0Al_(2)O_(3) single crystal seed induction based on crystallographic orientation tailoring.The orientations of Al_(2)O_(3)/YAG eutectic are more strictly constrained by single crystal seed induction on the basis of the minimum interface energy principle,resulting in a defined single orientation relationship along the solidification direction.In particular,the single crystallographic orientation can be obtained in a short competitive solidification distance under the influence of epitaxial solidification from single crystal seed.Therefore,it has been confirmed that the orientations of 112¯0Al_(2)O_(3) and 111YAG are preferentially stabilized with the minimum under-cooling during directional solidification.Crystallographic orientation disturbances and instabilities due to polycrystalline crystal seed are avoided.Finally,the successful texture control inducted by 112¯0Al_(2)O_(3) single crystal seed can provide a promising orientation design pathway for faced oxide eutectic solidification. | Yuan Liu Haijun Su Zhonglin Shen Di Zhao Yinuo Guo Shanding Li Min Guo Lin Liu Hengzhi Fu | 2023 | Journal of Materials Science & Technology2023，，15： | 0 |
| 6 | Large-diameter indium antimonide microwire based broadband and robust optical switch显示文摘Various nanophotonic devices based on semiconductor wires with a diameter of several ten nanometers have been studied.Nevertheless,studying the optoelectronics properties and performance of such devices based on large-diameter wires is interesting and meaningful.Here,we successfully grew the micronsized indium antimonide(InSb) wires,and examined their nonlinear optical properties by Z-scan and I-scan(power-dependent) methods within the wavelength range of 0.8-2.8 μm.Furthermore,we demonstrated InSb micro wires(MWs) working as an effective and robust optical switch within 1-2.8 μm wavelength.The findings can open possibilities for research on more large-diameter MWs made from other semiconductor materials for photonic and electronic devices. | Fei Lou Xiangpeng Cui Xinyue Sheng Chunyan Jia Shuaiyi Zhang Xia Wang Vladislav Khayrudinov Baitao Zhang Shande Liu Wing Yim Tam Harri Lipsanen He Yang Jingliang He | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，2： | 0 |
| 7 | Specific Types of Screen-Based Sedentary Time and Depressive Symptoms in Adolescents显示文摘Purpose:Screen-based sedentary behavior(SSB)has been identified as risk factor for mental disorders in most of adolescents.However,there is little literature pertaining to the specific kinds of SSB and its connections with depressive symptoms in most of adolescents.In the present study,we are going tofind out the connections between specific types of SSB and depressive symptoms in Chinese adolescents.Methods:A cross-sectional data based on 996 study participants of middle school students in Guangdong Province.SSB was evaluated by distri-buting the questionnaire of Health Behavior in School-aged Children,while depressive symptoms were evaluated using Chinese version of Children’s Depressive symptoms Inventory(CDI).SSB was categorized into TV/movie time,video games time and other electronic devices-based time(e.g.,mobile phone,computer use).Generalized linear models was used to explore the connections between specific kinds of SSB and depressive symptoms.Results:After controlling for variables of sex,ethnicity,grade,residence,siblings,perceived family affluence,father educational level,mother educational background,body mass index(BMI),physical exercise,duration of sleep,other electronic devices-based time was positively correlated with depressive symptoms in Chinese adolescents(B=0.557%,95%CI:0.187–0.926,p=0.003).This significant connection was also found in girls(B=0.728%,95%CI:0.230–1.225,p=0.004)instead of boys(p>0.05).The other types of SSB were not signifi-cantly in relation to depressive symptoms in adolescents regardless of sex.Conclusion:This study suggested that it might be effective in reducing or preventing depressive symptoms through limiting electronic devices-based time,like computer use or mobile phone use time.This strategy would be particularly useful in girls.Future stu-dies should negate or replicate the research results by introducing more improved study design,which is beneficial to better understand the connections between SSB and depressive symptoms as well as then design more efficient interventions in adolescents. | Shande Liu | 2022 | International Journal of Mental Health Promotion2022，24，4： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员