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Experimental demonstration of influence of underwater turbulence on ghost imaging

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Chinese Physics B 2019年第9期28卷 180-185页

作者： Man-qian Yin Le Wang sheng-Mei Zhao Institute of Signal Processing and Transmission Nanjing University of Posts and Telecommunications

It is difficult to obtain a clear image in underwater turbulence environment with classical imaging methods due to the absorption, scattering, and underwater turbulence on the propagation ***, ghost imaging(GI), a nonlocally imaging technique, has shown the turbulence-free ability in atmospheric turbulence by exploiting the second-order correlation between the signal beam and the reference *** this paper, we experimentally investigate the imaging quality of GI affected by the underwater environment, where the underwater environment is simulated by a 1 m×0.4 m×0.4 m tank with distilled *** water temperature is controlled by a heater inside the tank, and a temperature gradient is obtained by putting the heater at different positions of the *** water vibration is produced by a heavy force, and the turbid medium is obtained by dissolving very small specks of CaCO3 in the water.A set of Hadamard speckle pattern pairs are generated and modulated on the incident beam, and then the beam illuminates on an unknown object after passing through the simulated underwater *** the second-order correlations, the image is reconstructed under different temperature gradients, water vibration, and turbid medium *** results show that GI has the turbulence-free ability under lower temperature gradient, water vibration, and turbid *** structural similarity image measurement(SSIM)values of the reconstructed images only start to decrease when the temperature gradient is greater than 4.0℃.The same temperature gradient produced at the different positions has a little effect on the quality of the underwater GI.

关键词： underwater ghost imaging temperature gradient turbid media water vibration

Single-cell RNA sequencing in cornea research:Insights into limbal stem cells and their niche regulation

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World Journal of Stem Cells 2023年第5期15卷 466-475页

作者： Di Sun Wei-Yun Shi sheng-qian Dou State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyEye Institute of Shandong First Medical UniversityQingdao 266000Shandong ProvinceChina Qingdao Eye Hospital of Shandong First Medical University Qingdao 266000Shandong ProvinceChina Eye Hospital of Shandong First Medical University Jinan 250000Shandong ProvinceChina School of Ophthalmology Shandong First Medical UniversityQingdao 266000Shandong ProvinceChina

The corneal epithelium is composed of stratified squamous epithelial cells on the outer surface of the eye,which acts as a protective barrier and is critical for clear and stable *** continuous renewal or wound healing depends on the proliferation and differentiation of limbal stem cells(LSCs),a cell population that resides at the limbus in a highly regulated *** of LSCs or their niche can cause limbal stem cell deficiency,a disease that is manifested by failed epithelial wound healing or even ***,compared to stem cells in other tissues,little is known about the LSCs and their *** the advent of single-cell RNA sequencing,our understanding of LSC characteristics and their microenvironment has grown *** this review,we summarized the current findings from single-cell studies in the field of cornea research and focused on important advancements driven by this technology,including the heterogeneity of the LSC population,novel LSC markers and regulation of the LSC niche,which will provide a reference for clinical issues such as corneal epithelial wound healing,ocular surface reconstruction and interventions for related diseases.

关键词： Cornea Limbal stem cells Single cell RNA sequencing Heterogeneity Novel markers Niche regulation

Enhanced Synchronization of Intercellular Calcium Oscillations by Noise Contaminated Signals

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Communications in Theoretical Physics 2008年第10期50卷 903-906页

作者： ZHANG Ji-qian CHEN Han-Shuang WANG Mao-sheng College of Physics and Electronic Information Anhui Normal University Wuhu 241000 China

We consider the dynamics of locally coupled calcium oscillation systems,each cell is subjected to extracel-lular contaminated signal,which contains common sub-threshold signal and independent Gaussian *** is found thatintermediate noise can enhance synchronized oscillations of calcium ions,where the frequency of noise-induced oscilla-tions is matched with the one of sub-threshold external *** show that synchronization is enhanced as a result ofthe entrainment of external signal Furthermore,the effect of coupling strength is *** find above-mentionedphenomenon exists only when coupling strength is very *** findings may exhibit that noise can enhance thedetection of feeble external signal through the mechanism of synchronization of intercellular calcium ions.

关键词： synchronization noise coupled oscillators random processes

Comparison of bilateral/unilateral lateral rectus recession and unilateral recession-resection for intermittent exotropia:a Meta-analysis

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International Journal of Ophthalmology(English edition) 2018年第12期11卷 1984-1993页

作者： De-sheng Song Zhi-Jun Chen Jing qian Department of Ophthalmology Children's Hospital of Nanjing Medical University

AIM: To compare the effectiveness of unilateral recession-resection(R&R) and bilateral/unilateral recession(BLR/ULR) for treatment of basic type of intermittent exotropia [IX(T)].METHODS: A comprehensive literature search was performed using PubMed, EMBASE, and the Cochrane Library, to identify randomized controlled trials and comparative studies regarding the effectiveness of R&R and BLR/ULR for IX(T). Based on which, a Meta-analysis was then performed in terms of long-term success rate, overcorrection rate, and recurrence ***: Nine studies in total satisfy the specified eligibility criteria. BLR is at disadvantage to R&R at a short-term follow-up [2 y). There is no significant difference was found in overcorrection rate, regardless of the length of follow-up time [OR 0.85(0.41, 1.75)]. In the treatment for small-angle IX(T), the final outcome was significantly different between the groups, demonstrating a more successful alignment [OR 0.37(0.18, 0.74)] and a lower undercorrection [OR 3.50(1.28, 7.26)] in the R&R group than in the ULR group. While for moderate-angle IX(T)(20 PD-25 PD), the effectiveness of R&R and ULR is quite equivalent with similar success rate [OR 1.08(0.65, 1.79)] and undercorrection rate [OR 0.89(0.54, 1.48)]. CONCLUSION: As regard to the effect of BLR and R&R, R&R shows an advantage over BLR at short term. But, BLR is more effective in the long term for the basic typeIX(T) in children. R&R surgery should be a better choice for the treatment of small-angle IX(T) of ≤20 PD than ULR. However, both of ULR and R&R are recommended for moderate-angle IX(T) from 20 PD to 25 PD.

关键词： intermittent exotropia unilateral lateral rectus recession recess-resect moderate-angle exotropia

Reversibility of the structure and dewaterability of anaerobic digested sludge

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Journal of Environmental Sciences 2016年第4期28卷 178-186页

作者： Yiqi sheng Yili Wang Wei Hu Xu qian Huaili Zheng Xiaoxiu Lun College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry University College of Urban Construction and Environmental Engineering Chongqing University

The reversibility of the structure and dewaterability of broken anaerobic digested sludge（ADS）is important to ensure the efficiency of sludge treatment or management *** study investigated the effect of continuous strong shear（CSS）and multipulse shear（MPS）on the zeta potential,size（median size,d（50））,mass fractal dimension（DF）,and capillary suction time（CST）of ADS ***,the self-regrowth（SR）of broken ADS aggregates during slow mixing was also *** results show that raw ADS with d（50） of 56.5μm was insensitive to CSS–SR or MPS–SR,though the size slightly decreased after the breakage *** conditioned ADS with d（50） larger than 600μm,the breakage in small-scale surface erosion changed to large-scale fragmentation as the CSS strength *** most cases,after CSS or MPS,the broken ADS had a relatively more compact structure than before and d（50） is at least 200μ*** CST of the broken fragments from optimally dosed ADS increased,whereas that corresponding to overdosed ADS *** treatment resulted in larger and more compact broken ADS fragments with a lower CST value than *** the subsequent slow mixing,the broken ADS aggregates did not recover their charge,size,and dewaterability to the initial values before *** addition,less than 15%self-regrowth in terms of percentage of the regrowth factor was observed in broken ADS after CSS at average velocity gradient no less than 1905.6 sec^（-1）.

关键词： Anaerobic digested sludge Shear Reversibility Structure Dewaterability Floc strength

Synthesis and Optoelectronic Properties of Donor-acceptor Molecules Containing Pyromellitic Diimide Chromophore

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Chemical Research in Chinese Universities 2013年第6期29卷 1083-1088页

作者： ZHANG qian LU Xue-feng WANG Zhong-sheng ZHOU Gang Laboratory of Advanced Materials Department of ChemistryFudan University Shanghai 200438 P.R.China

Three donor-acceptor molecules containing pyromellitic diimide chromophore were designed and synthe- sized. The synthetic route towards the target compounds was systematically investigated and discussed in detail. The resulted organic semiconductors have shown promising optoelectronic properties as further revealed by UV-Vis ab- sorption spectroscopy, cyclic voltammetry, and theoretic calculation.

关键词： Pyromellitic diimide Donor-acceptor Charge transfer

Revision of the photometric parameters of BS Cassiopeiae

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Research in Astronomy and Astrophysics 2010年第6期10卷 569-576页

作者： Jia-Jia He sheng-Bang qian Miloslav Zejda Zdenek Mikulasek National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China Key Laboratory for the Structure and Evolution of Celestial Objects National Astronomical Observatories/Yunnan Observatory Chinese Academy of Sciences Kunming 650011 China Institute of Theoretical Physics and Astrophysics Masaryk University Kotlarska 2 611 37 Brno Czech Republic Observatory and Planetarium of J. Palisa VSB- Technical University Ostrava Czech Republic

Seven charge-coupled device （CCD） photometric times of light minimum of the overcontact binary BS Cas which were obtained from 2007 August to November and one CCD light curve in the R band which was observed on 2007 September 24 and October 15, are presented. It is found that the light curve ofBS Cas has characteristics like a typical EW-type light variation. The light curve obtained by us is symmetric and shows total eclipses, which is very useful for determining photometric parameters with high precision. Photometric solutions were derived by using the 2003 version of the Wilson-Devinney code. It shows that BS Cas is a W-subtype overcontact binary （f = 27.5% ± 0.4%） with a mass ratio of q = 2.7188± 0.0040. The temperature difference between the two components is 190 K. Analysis of the 042 curve suggests that the period of AE Phe shows a long-term continuous decrease at a rate of dP/dt = - 2.45 × 10^-7 d yr^- 1 The long-time period decrease can be explained by mass transfer from the primary to the secondary.

关键词： stars binaries close -- stars binaries eclipsing -- stars individual BS Cas

Monte Carlo Simulation on Layered Polymeric Films

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Chinese Journal of Polymer Science 2014年第5期32卷 595-602页

作者： Ru Xia Xiang-song Wu 陈鹏 Jia-sheng qian Xiao-shuang Feng Anhui Province Key Laboratory of Environment-friendly Polymer Materials School of Chemistry and Chemical Engineering Anhui University Eco-Efficient Product & Process Laboratory (E2P2L) UMI 3464 Research & Innovation Center in Shanghai (RICS) Solvay(China) Co. Ltd.

Thin films of polymer blends composed of alternating copolymer, diblock copolymer and/or homopolymer are studied using Monte Carlo simulation. A multilayer morphology is observed in the film, that is, the blended polymers assemble into individual domains arranged from interior to the surfaces of the film. The coexisting components residing throughout the neighboring domains in the film make no distinguishable interface between any neighboring domains. By this means, it forms a vertical composition gradient in the polymeric film. Being different from layer-by-layer deposition of polyelectrolyte or hydrogen bonding approach etc., the layered structure in this study is formed by polymer blending in one step. Alternating copolymers are found to be essential components to form vertical composition gradient （layered structure） in thin films.

关键词： Monte Carlo simulation Polymer blends Alternating copolymer Layered structure.

Natural Characteristic of Thin-Wall Pipe under Uniformly Distributed Pressure

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Chinese Journal of Mechanical Engineering 2018年第6期31卷 118-127页

作者： Chao-Feng Li qian-sheng Tang Hou-Xin She Bang-Chun Wen School of Mechanical Engineering & Automation Northeastern University Shenyang 110819 China Key Laboratory of Vibration and Control of Aero-propulsion Systems Northeastern University Shenyang 110819 China

Natural characteristics of thin?wall pipe of the compressor under uniformly distributed pressure were presented in this paper based on a cylindrical shell model. In the traditional method, the beam model was usually used to analyze the pipe system. In actual fact, the pipe segment of the compressor was always broken in the form of a long crack or a partial hole and the phenomenon was hardly explained by beam model. According to the structure characteristic of compressor pipe segment, whose radius is large and thickness is little, shell model shows the advantage in this kind of pipe problem. Based on Sanders’ shell theory, the vibration di erential equation of pipe was established by apply?ing the energy method. The influences of length to radius ratio(L/R), thickness to radius ratio(h/R), circumferential wave number(n) and pressure(q) on the natural frequencies of pipe were analyzed. The study shows: Pressure and structural parameters have a great e ect on the natural characteristics of the pipe. Natural frequency increases as the pressure increases, especially for the higher mode. The sensitivity of natural frequency on pressure becomes stronger with h/R ratio increases; when L/R ratio is greater than a certain critical value, the influence of the pressure on natural frequency will no longer be obvious. The value of n corresponding to the minimum natural frequency also depends on the value of pressure. In the end, analysis of the forced vibration of a specific pipeline model was given and the modal shapes were illustrated to understand the break of the pipe. The research here will provide the theory support for the dynamic design of related pressure pipe and further experiment study should be employed.

关键词： Pipe vibration Natural frequency Pulse pressures Geometric parameters Modal shape