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Resolution and contrast enhancement in optical subtraction microscopy with annular aperture

optoelectronics Letters 2019年第2期15卷 93-97页

作者： LI Zheng-ya WANG Xiang-hui FAN Fei CHENG Jie-rong CHANG Sheng-jiang Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern Optics Nankai University

A method for improving lateral resolution and reducing imaging distortion of optical subtraction microscopy is ***, an azimuthally polarized(AP) light is modulated by an annular ***, an image with higher lateral resolution is obtained by subtracting an image obtained by an annular AP beam from an image obtained by a radially polarized *** simulation results demonstrate that compared with the case without the annular aperture, negative side-lobes in the effective point spread function are effectively suppressed, and the imaging quality of subtraction microscopy is obviously enhanced.

关键词： PSF Resolution enhancement subtraction

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Numerical study of gain equalization in burst-mode Yb^(3+)-doped fiber amplifier with pulse pump by FDTD method

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optoelectronics Letters 2021年第8期17卷 496-500页

作者： ZHU Longfei LI Caiyun LIU Yange XING Dengke ZHANG Luhe ZHU Kaiyan WANG Zhi Tianjin Key Laboratory of Optoelectronic Sensor Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300350China

The amplifying dynamics of the pulse burst in Yb^(3+)-doped fiber amplifier(YDFA)with high-power pulse pump is numerically analyzed by a finite-difference time-domain(FDTD)*** numerical simulations show that the amplitude uniformity of the amplified pulse burst can be modified by adjusting the parameters of pump,such as relative delay and *** optimizing the pump parameters,we can reduce the gain difference between the pulses in a burst and improve the efficiency of coherent pulse stacking based on Gires-Tournois interferometers(GTIs).These results can be applied to the design of high energy ultra-short pulse amplifiers based on burst-mode amplification and coherent pulse stacking technology.

关键词： pump amplifier pulse

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Tunable and narrow linewidth multi-wavelength Brillouin-erbium fiber laser using dual-wavelength pumping

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optoelectronics Letters 2022年第6期18卷 349-353页

作者： ZHU Kaiyan HE Jiangyong CHANG Kun XING Dengke LIU Yange WANG Zhi Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Institute of Modern OpticsNankai UniversityTianjin 300350China

We demonstrate a multi-wavelength Brillouin-erbium fiber laser(BEFL)with narrow linewidth and tunable wavelength interval using dual-wavelength Brillouin *** generation of multi-wavelength output in BEFL is based on the combination of stimulated Brillouin scattering(SBS)and four-wave mixing(FWM)effect in a fiber *** tunable wavelength interval is determined by the artificially controlled wavelength interval of the pumping *** BEFL could compress a 1 MHz pump laser to a 340 Hz Brillouin Stokes laser,which proves the BEFL has excellent capability of linewidth *** erbium-doped fiber pumped by 980 nm laser is inserted into the cavity to further amplify the Brillouin *** wideband multi-wavelength BEFL covering over 50 nm is successfully generated when the 980 nm pump power is 400 *** features of multi-wavelength BEFL provide an effective method for optical communication systems and optical fiber sensing.

关键词： pumping fiber laser

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Study on ultra-precision phase synchronization technique employing phase-locked loop

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optoelectronics Letters 2021年第3期17卷 134-139页

作者： ZHANG Wan-peng WU Hong ZHOU Wei-feng ZHAO Ying-xin LIU Zhi-yang YANG Meng-huan Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China

Microwave-to-optical phase synchronization techniques have attracted growing research interests in recent years. Here, we demonstrate tight, real-time phase synchronization of an optical frequency comb to a rubidium atomic clock. A detailed mathematical model of the phase locking system is developed to optimize its built-in parameters. Based on the model, we fabricate a phase locking circuit with high integration. Once synchronized, the fractional frequency instability of the repetition rate agrees to 6.35×10^(-12) at 1 s and the standard deviation is 1.5 mHz, which indicates the phase synchronization system can implement high-precision stabilization. This integrated stable laser comb should enable a wide range of applications beyond the laboratory.

关键词： synchronization phase locking

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Prediction of Intrinsically Disordered Proteins with a Low Computational Complexity Method

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Computer Modeling in Engineering & Sciences 2020年第10期125卷 111-123页

作者： Jia Yang Haiyuan Liu Hao He Nankai University School of Electronic Information and Optical EngineeringTianjin Key Laboratory of Optoelectronic Sensor and Sensing Network TechnologyTianjin300350China Hebei University of Technology Tianjin300400China

The prediction of intrinsically disordered proteins is a hot research area in *** to the high cost of experimental methods to evaluate disordered regions of protein sequences,it is becoming increasingly important to predict those regions through computational *** this paper,we developed a novel scheme by employing sequence complexity to calculate six features for each residue of a protein sequence,which includes the Shannon entropy,the topological entropy,the sample entropy and three amino acid preferences including Remark 465,Deleage/Roux,and Bfactor(2STD).Particularly,we introduced the sample entropy for calculating time series complexity by mapping the amino acid sequence to a time series of *** our knowledge,the sample entropy has not been previously used for predicting IDPs and hence is being used for the first time in our *** addition,the scheme used a properly sized sliding window in every protein sequence which greatly improved the prediction ***,we used seven machine learning algorithms and tested with 10-fold cross-validation to get the results on the dataset R80 collected by Yang et *** of the dataset DIS1556 from the Database of Protein Disorder(DisProt)(https://***)containing experimentally determined intrinsically disordered proteins(IDPs).The results showed that k-Nearest Neighbor was more appropriate and an overall prediction accuracy of 92%.Furthermore,our method just used six features and hence required lower computational complexity.

关键词： Bioinformatics intrinsically disordered proteins machine learning algorithms sequences computational complexity

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Single-molecule devices reveal step-by-step dynamics of hydrogen bonds

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Science China Chemistry 2018年第6期61卷 639-640页

作者： Lifa Ni Dong Xiang Takhee Lee Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology College of Electronic Information and Optical Engineering Nankai University Department of Physics and Astronomy Seoul National University

Intermolecular interactions,including hydrogen bonding,hydrophobic interactions,halogen bonding etc.,are ubiquitous in nature,which play key roles in the basic chemical,physical and biochemical process of *** them,hydrogen bonds are particularly attractive because they dominate many important structures and functions in nature from elegant base-pair interactions in DNAs to sophisticated protein folding and are regarded as an important element in the discovery of new *** better elucidate fundamental mechanisms,

关键词：氢结合单个分子动力学设备相互作用生物化学分子间 DNA

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Analysis of base stations deployment on power saving for heterogeneous network 17

Analysis of base stations deployment on power saving for het...

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17th IEEE International Conference on Communication technology, ICCT 2017

作者： Lv, Yuanhong Zhang, Hui Xueming, Sui NanKai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin China

ISBN: (纸本)9781509039432

With the increasing of energy consumption in the wireless network, Heterogeneous network (HetNet) is used to improve the capability of communication networks, save transmitting power of base stations (BSs), enhance the coverage of communication network and so on. Designing an energy efficient network should not only consider the energy efficient operation of BSs, but also take the energy efficiency of mobile devices (MDs) into account. This paper considers the energy efficiency of BSs and MDs and studies the power saving of HetNet from a more comprehensive and systematic perspective. This paper mainly analyzes the deployment of a certain number of micro BSs in the region which has a certain number of macro BSs, and compares the power saving indicator at different radius of the micro BSs in three algorithms, which are that the region-based deployment algorithm, the grid-based deployment algorithm and the greedy BSs deployment algorithm. The greedy BSs deployment algorithm is used to determine the most suitable positions of micro BSs, in order to maximize the overall power saving indicator of the entire HetNet. © 2017 IEEE.

关键词： Heterogeneous networks

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Research on Resource Allocation Based on Immune Algorithm in D2D System 19

Research on Resource Allocation Based on Immune Algorithm in...

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19th IEEE International Conference on Communication technology, ICCT 2019

作者： Zheng, Tianyu Zhang, Hui Fei, Lei Li, Luan Nankai University Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology Tianjin China

ISBN: (纸本)9781728105352

D2D technology is a communication method in which two users can communicate directly by multiplexing cellular channels. Due to the existence of co-channel interference, research on resource allocation is particularly significant. We first describe the D2D communication scenario and discuss the difference of path loss model between D2D users and cellular users, then summarize the problem as an optimization model to maximize the multiplexed channel throughput. According to this optimization goal, a resource allocation algorithm based on immune theory is proposed, which can find the best multiplexed channels for D2D pairs. The simulation results show that the proposed algorithm can effectively improve the channel throughput compared with the existing literature algorithms. © 2019 IEEE.

关键词： Resource allocation

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Efficient hydrolysis of coagulated porcine blood by a purified lumbrokinase from Eisenia fetida

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Food Bioscience 2025年 68卷

作者： Xin, Xuan Huang, Yuhua Zhang, Mengmeng Zou, Yucong Zeng, Liyan Fei, Yongtao Bai, Weidong Yang, Shanghua College of Light Industry and Food Technology Zhongkai University of Agriculture and Engineering Dongsha Street 24 Guangdong Guangzhou 510225 China College of Chemistry and Chemical Engineering Zhongkai University of Agriculture and Engineering Dongsha Street 24 Guangdong Guangzhou 510225 China School of Chemistry and Chemical Engineering Guangdong Provincial Key Laboratory of Optoelectronic Materials and Sensor Components Guangzhou Key Laboratory of Sensing Materials & Devices Centre for Advanced Analytical Science Guangzhou University Guangzhou 510006 China

Lumbrokinase, a serine protease with fibrinolytic activity in earthworms, is rarely used in food processing. To investigate the potential of lumbrokinase for hydrolyzing congealed porcine blood proteins, an electrophoretically pure lumbrokinase, L-C1, was isolated from E. fetida, which had a fibrinolytic activity of 85,312 U/mg, a molecular weight of 26 kDa, an optimal temperature range of 10–50 °C, and an optimal pH range of 5–11. The degree of hydrolysis, soluble peptide yield, and free amino acid content of the hydrolysates prepared by L-C1 were 43.30 %, 47.10 %, and 35.39 g/100 g, respectively. Moreover, the hydrolysates (1 mg/mL) had the highest ABTS, DPPH radical scavenging, and ACE inhibition rates of 77.85 %, 56.52 %, and 86.21 %, respectively. Results demonstrated that lumbrokinase hydrolyzed porcine blood proteins more efficiently than papain, alcalase, and bromelain, highlighting the potential application of its hydrolysates in functional foods. This study provides directions for the application of lumbrokinase in food processing and new enzymes for the hydrolysis of food proteins. © 2025 Elsevier Ltd

关键词： Active peptide Earthworm Enzymatic hydrolysis Enzyme Lumbrokinase Porcine blood

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Improved sensing performance of WO_(3) nanoparticles decorated with Ag and Pt nanoparticles

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Rare Metals 2021年第6期40卷 1642-1650页

作者： Dong-Liang Feng Zheng-You Zhu Ling-Ling Du Xia-Xia Xing Chen Wang Jian Chen Yong-Tao Tian Da-Chi Yang Tianjin Key Laboratory of Optoelectronic Sensor and Sensing Network Technology and Department of ElectronicsCollege of Electronic Information and Optical EngineeringNankai UniversityTianjin 300350China School of Physics and Engineering and Key Laboratory of Materials Physics Ministry of EducationZhengzhou UniversityZhengzhou 450001China

Gas sensors built with metal oxide semiconductors have attracted tremendous attention due to the growing demand for the detection of inflammable,explosive and toxic ***,to improve the sensing response,WO_(3) nanoparticles decorated with Ag and Pt bimetals(Ag and Pt/WO_(3) NPs)have been developed via combined hydrolysis and hydrothermal *** sensors prototypes show high response to acetone(Ra/Rg=250@100×10^(-6),140℃),which is 6.1 fold as high as that of the pristine WO_(3) NPs(Ra/Rg=41@100×10^(-6),140℃).Moreover,the recovery time of Ag and Pt/WO_(3) NPs was reduced from 138 to 13 s compared with that of the pristine WO_(3) *** improved acetone sensing performance may be attributed to that the chemical and electronic sensitization of Ag and Pt to WO_(3) NPs increases adsorbed oxygen species,speeds up the reaction and thus boosts the sensing *** strategy that decoration of dual precious metals onto WO_(3) NPs improves the acetone sensing performance may be applied to the gas sensors of other sensing materials.

关键词： WO_(3)nanoparticles Ag and Pt bimetals Acetone sensing Chemical sensitization Recovery time

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