|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 3D morphology and formation mechanism of fractures developed by true triaxial stress显示文摘As main part of underground rock mass,the three-dimensional(3D)morphology of natural fractures plays an important role in rock mass stability.Based on previous studies on 3D morphology,this study probes into the law and mechanism regarding the influence of the confining pressure constraints on 3D morphological features of natural fractures.First,fracture surfaces were obtained by true triaxial compression test and 3D laser scanning.Then 3D morphological parameters of fractures were calculated by using Grasselli’s model.The results show that the failure mode of granites developed by true triaxial stress can be categorized into tension failure and shear failure.Based on the spatial position of fractures,they can be divided into tension fracture surface,S-1 shear fracture surface,and S-2 shear fracture surface.Micro-failure of the tension fracture surface is dominated by mainly intergranular fracture;the maximum height of asperities on the fracture surface and the 3D roughness of fracture surfaces are influenced by σ_(3) only and they are greater than those of shear fracture surfaces,a lower overall uniformity than tension fracture surface.S-1 shear fracture surface and S-2 shear fracture surface are dominated by intragranular and intergranular coupling fracture.The maximum height of asperities on the fracture surface and 3D roughness of fracture surface are affected by σ_(1),σ_(2),and σ_(3).With the increase of σ_(2) or σ_(3),the cutting off of asperities on the fracture surface becomes more common,the maximum height of asperities and 3D roughness of fracture surface further decrease,and the overall uniformity gets further improved.The experimental results are favorable for selecting technical parameters of enhanced geothermal development and the safety of underground mine engineering. | Bing Chen Baotang Shen Shichuan Zhang Yangyang Li Haiyang Jiang | 2022 | International Journal of Mining Science and Technology2022，32，6： | 4 |
| 2 | Application of confocal laser Raman spectroscopy on marine sediment microplastics显示文摘Marine sediment is the primary sink of microplastics and is an indicator of pollution levels.However,although there are well-developed detection methods,detection is rarely focused on lowmicrometer-sized particles,mainly due to technique limitations.In this study,a simplifi ed process omitting digestion procedures was developed to pretreat microplastics obtained from marine sediment and was coupled with micro-Raman spectroscopy to identify microplastics.Based on the overall analysis of the characteristic peak assignments,a Raman spectral reference library was constructed for 18 types of plastic.In addition,the eff ects of the measurement parameters were systematically described.Field research was then conducted to validate the developed process and investigate microplastic contamination in Huiquan Bay,Qingdao,China.This simplifi ed process could retain the original appearance of microparticles and accomplish the detection of<500μm-sized microplastics in environmental samples.Microplastics in the size range of 10-150μm accounted for 76%of all microplastics,and 56%of the total particles was particles smaller than 50μm.Polypropylene(42%)and polyethylene(20%)were predominant components of the particles.In particular,polypropylene particles smaller than 10μm were identifi ed in marine sediment.This work demonstrates that Raman spectroscopy is not only an eff ective tool for detecting environmental particles but also highly applicable for identifying particles extracted from marine sediment. | LIU Jing ZHANG Xin DU Zengfeng LUAN Zhendong LI Lianfu XI Shichuan WANG Bing CAO Lei YAN Jun | 2020 | Journal of Oceanology and Limnology2020，38，5： | 2 |
| 3 | Effect of ultramicropores and inner space of carbon materials on the capacitive sodium storage performance显示文摘1.Introduction Carbon materials have been widely investigated as the anode materials for Na+storage due to their moderate capacity,good stability,and low cost.The Na+storage mechanisms of carbon are generally classified into diffusion-controlled interlayer insertion/desertion and capacitive-controlled surface adsorption/desorption[1]. | Zimu Jiang Su Zhang Jing Feng Yuting Jiang Shichuan Liang Qiqi Li Mengjiao Shi Meng Cao Mingyi Zhang Tong Wei Zhuangjun Fan | 2022 | Journal of Energy Chemistry2022，31，10： | 0 |
| 4 | A deep‐sea sulfate‐reducing bacterium generates zero‐valent sulfur via metabolizing thiosulfate显示文摘Zero‐valent sulfur(ZVS)is a crucial intermediate in the sulfur geobiochemical circulation and is widespread in deep‐sea cold seeps.Sulfur‐oxidizing bacteria are thought to be the major contributors to the formation of ZVS.However,ZVS production mediated by sulfate‐reducing bacteria(SRB)has rarely been reported.In this study,we isolated and cultured a typical SRB designated Oceanidesulfovibrio marinus CS1 from deep‐sea cold seep sediment in the South China Sea.We show that O.marinus CS1 forms ZVS in the medium supplemented with thiosulfate.Proteomic and protein activity assays revealed that thiosulfate reductase(PhsA)and the sulfide:quinone oxidoreductase(SQR)played key roles in driving ZVS formation in O.marinus CS1.During this process,thiosulfate firstly was reduced by PhsA to form sulfide,then sulfide was oxidized by SQR to produce ZVS.The expressions of PhsA and SQR were significantly upregulated when O.marinus CS1 was cultured in a deep‐sea cold seep,strongly indicating that strain CS1 might form ZVS in the deep‐sea environment.Notably,homologs of phsA and sqr were widely identified from microbes living in sediments of deep‐sea cold seep in the South China Sea by the metagenomic analysis.We thus propose that SRB containing phsA and sqr genes potentially contribute to the formation of ZVS in deep‐sea cold seep environments. | Rui Liu Yeqi Shan Shichuan Xi Xin Zhang Chaomin Sun | 2022 | mLife2022，1，3： | 0 |
| 5 | Stretchable on-skin touchless screen sensor enabled by ionic hydrogel显示文摘Screen sensors are the most commonly used human-machine interfaces in our everyday life,which have been extensively applied in personal electronics like cellphones.Touchless screen sensors are attracting growing interest due to their distinct advantages of high interaction freedom,comfortability,and hand hygiene.However,the material compositions of current touchless screen sensors are rigid and fragile,hardly meeting the needs of wearable and stretchable on-skin electronics development.Additionally,these touchless screen sensors are also restricted by high power consumption,limited gesture types of recognition,and the requirement of light conditions.Here,we report a stretchable on-skin touchless screen sensor(OTSS)enabled by an ionic hydrogel-based triboelectric nanogenerator(TENG).Compared with current touchless screen sensors,the OTSS is stretchable,self-powered,and competent to recognize diverse gestures by making use of charges naturally carried on fingers without the need of sufficient light conditions.An on-skin noncontact screen operating system is further demonstrated on the basis of the OTSS,which could unlock a cellphone interface in touchless operation mode on the human skin.This work for the first time introduces the on-skin touchless concept to screen sensors and offers a direction to develop new-generation screen sensors for future cellphones and personal electronics. | Tianxing Feng Dan Ling Chaoyue Li Wentao Zheng Shichuan Zhang Chang Li Artem Emel’yanov Alexander S.Pozdnyakov Lijun Lu Yanchao Mao | 2024 | Nano Research2024，17，5： | 0 |
| 6 | Boosting the dimensionality of frequency entanglement using a reconfigurable microring resonator显示文摘Integrated quantum frequency combs(QFCs)based on microring resonators supplies as an essential resource for expanding the Hilbert-space dimensionality for high-dimensional quantum computing and information processing.In this work,we propose and demonstrate a reconfigurable ring resonator with tunable quality factors to efficiently increase the dimensionality of frequency entanglement,simultaneously,ensuring a high on-chip pair generation rate(PGR)and coincidence-to-accidental ratio(CAR).Our method exploits the asymmetric Mach-Zehnder interferometer instead of the traditional straight waveguide as the coupler of resonators which offer a tunable external coupling coefficient to modulate the quality factor to enlarge the QFCs’bandwidth and thus increase the dimensionality of frequency entanglement.We measured the QFCs’joint spectral intensity of 28 frequency pairs under various quality factors ranging from 16.6×10^(4) to 3.4×10^(4).Meanwhile,the measured Schmidt number increased from 11.01 to 24.77,denoting a huge expansion of the Hilbert-space dimensionality from 121 to a record number of 613 dimensions,which agrees well with our theoretical calculations.In addition,the PGR and CAR-another two key parameters for high-quality QFCs-were all measured under different quality factors to verify that our method can significantly increase the Schmidt number and CAR while maintaining a high PGR.In fact,bright QFCs with a total PGR of 4.3 MHz under a 0.48 mW pump power and a mean CAR of 1578 were simultaneously obtained at the highest Schmidt number.This method is widely applicable to other material-based ring resonators and can act as a general solution for high-dimensional QFCs. | Chao Wu Qilin Zheng Yingwen Liu Yang Wang Jiangfang Ding Pingyu Zhu Shichuan Xue Miaomiao Yu Weihong Luo Kaikai Zhang Anqi Huang Mingtang Deng Junjie Wu Ping Xu | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，5： | 0 |
| 7 | Simulation of Supercritical Carbon Dioxide Fracturing in Shale Gas Reservoir显示文摘In order to fracture shale gas reservoir with carbon dioxide as the working fluid,laboratory experiments were firstly conducted to measure the influence of carbon dioxide immersion on shale rock's properties,and then the coupling mechanism between stress and seepage during hydraulic fracturing was simulated based on cohesive zone model.The fracturing ability of carbon dioxide and water was also compared under the same working conditions,and finally sensitivity analysis(including elastic modulus of shale,filtration coefficient,pump rate and viscosity of carbon dioxide)were conducted based on field application.The results show that,the elastic modulus of shale increased by 32.2%,the Poisson's ratio decreased by 40.3%and the compressive strength decreases by 22.9%after geothermal reaction with carbon dioxide under 30 MPa and 335.15 K for 2 hours.Compared with water fracturing,carbon dioxide fracturing induces longer fracture(increased by 25.3%)and narrower fracture(decreased to 40.8%).The fracture tends to get longer and narrower with increasing elastic modulus of shale.As filtration coefficient increases,the maximum width of fracture decreases significantly,whereas the length changes little.Both the length and maximum width of fracture increase with increasing pump rate,however the changing rate of length tends to decrease.The influence of viscosity of carbon dioxide on both fracture width and length is negligible,which validates the stable feasibility of carbon dioxide fracturing in different formation conditions. | SONG Weiqiang NI Hongjian TANG Peng ZHANG Shichuan GAO Jichao ZHANGJunming SHEN Baotang | 2021 | Journal of Thermal Science2021，30，4： | 0 |
| 8 | Subrecoil cooling of ^(6)Li atoms by 2S→3P ultraviolet narrow transition显示文摘Laser cooling of atoms and molecules is crucial to exhibiting excellent features in the field of low-temperature physics.Cooling ^(6)Li atoms to very low temperatures is difficult due to their partially resolved D_(2) line of excited states.Here we report an observation of cooling ^(6)Li atom samples to 16μK with an ultraviolet(UV)laser in a magneto-optical trap,which breaks the Doppler cooling limit and approaches half of the photon-recoil limit.The essential mechanism of cooling results is that the natural linewidth is comparable to the recoil frequency in such a 2S→3P ultraviolet narrow transition.Laser frequency stability is important in the cooling process,and thus,the UV laser was locked to an optical frequency comb referenced to an ultrastable optical cavity.The cooling was numerically simulated to explain the cooling forces.The results can provide an ideal platform in the field of precision measurements and ultracold Fermi gases. | Yang Rui Liang Zhang Rui Li Pengyue Liu Xuemei Liu Chunyang Duan Shichuan Yu Yuelong Wu Haibin Wu | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，8： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员