检索结果-南通市图书馆

Photonics Research 2016年第5期4卷 197-201页

作者： zhengyong li Changrui liao Jun Song Ying Wang Feng Zhu Yiping Wang Xiaopeng Dong Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University School of Information Science and Engineering Xiamen University

An ultrasensitive magnetic field sensor based on a compact in-fiber Mach–Zehnder interferometer(MZI) created in twin-core fiber(TCF) is proposed, and its performance is experimentally demonstrated. A section of TCF was spliced between two sections of standard single-mode fibers, and then a microchannel was drilled through one core of the TCF by means of femtosecond laser micromachining. The TCF with one microchannel was then immersed in a water-based Fe_3O_4 magnetic fluid(MF), forming a direct component of the light propagation path,and then sealed in a capillary tube, achieving a magnetic sensing element, which merges the advantages of an MZI with an MF. Experiments were conducted to investigate the magnetic response of the proposed sensor. The developed magnetic field sensor exhibits a linear response within a measurement range from 5 to 9.5 m T and an ultrahigh sensitivity of 20.8 nm/m T, which, to our best knowledge, is 2 orders of magnitude greater than other previously reported magnetic sensors. The proposed sensor is expected to offer significant potential for detecting weak magnetic fields.

关键词： TCF Zehnder interferometer with a magnetic fluid component Ultrasensitive magnetic field sensor based on an in-fiber Mach MZI

Uniformly high-speed semi-open loop polarization control and PMD suppression

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第5期18卷 1-5页

作者： Boehen Wang zhengyong li Key Laboratory of Luminescence and Optical Information Technology Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China

We propose and demonstrate a novel scheme of semi-open-loop polarization control(SOL-PC), which controls the state of polarization(SOP) with high accuracy and uniform high speed. For any desired SOP, we first adjust the initial SOP using open-loop control(OLC) based on the matrix model of a three-unit piezoelectric polarization controller, and quickly move it close to the objective one. Then closed-loop control(CLC) is performed to reduce the error and reach precisely the desired SOP. The response time is three orders faster than that of the present closed-loop polarization control, while the average deviation is on par with it. Finally, the SOL-PC system is successfully applied to realize the suppression of the polarization mode dispersion(PMD) effect and reduce the first-order PMD to near zero. Due to its perfect performance, the SOL-PC energizes the present polarization control to pursue an ideal product that can meet the future requirements in ultrafast optical transmission and quantum communication.

关键词： polarization control polarization mode dispersion fiber optics components coherent comm unications

Polarization scrambling characteristic analysis based on density of polarization states statistics

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2020年第6期18卷 15-18页

作者： Shangchun Wang zhengyong li Key Laboratory on Luminescence and Optical Information Technology Ministry of EducationBeijing Jiaotong UniversityBeijing 100044China

We report a new method to deeply analyze the scrambling characteristic of polarization scramblers based on density of polarization states(DPS)statistics that makes it possible to describe the DPS distribution in detail on the whole Poincarésphere,thus easy to locate accurately the nonuniform areas of defective polarization scramblers,which cannot be realized by existing *** have built a polarization scrambling system to demonstrate the advantages of our method compared with others by experiments and suggested effective evaluation indexes whose validity is well confirmed by applying to a commercial *** conclusions are valuable for accurately analyzing and diagnosing the performance of any polarization scrambler,and quality evaluation of polarization controllers or other polarization devices.

关键词： optical communication polarization scrambling density of polarization states

Long Period Fiber Gratings Written in Photonic Crystal Fibers by Use of CO2 Laser

在线全文

学校读者我要写书评

暂无评论

Photonic Sensors 2013年第3期3卷 193-201页

作者： Yiping WANG Changrui liAO Xiaoyong ZHONG Jiangtao ZHOU Yingjie liU zhengyong li Guanjun WANG Kaiming YANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education/Guangdong Province ShenzhenUniversity Shenzhen 518060 China

Photonic crystal fibers are usually divided into two different types of fibers： solid-core photonic crystal fibers （PCFs） and air-core photonic bandgaps fibers （PBFs）. We presented the fabrication methods and applications of long period fiber gratings （LPFGs） written in these two types of photonic crystal fibers by use of a CO2 laser. A stain sensor with a high sensitivity was demonstrated by use of an LPFG written in solid-core PCFs. An in-fiber polarizer based on an LPFG was fabricated by use of a focused CO2 laser beam to notch periodically on a PCF. A novel LPFG was written in an air-core PBF by use of a CO2 laser to collapse periodically air holes in the fiber cladding.

关键词： Long period fiber gratings fiber Bragg gratings photonic crystal fibers photonic bandgap fibers CO2 lasers

3D printing of personalized polylactic acid scaffold laden with GelMA/autologous auricle cartilage to promote ear reconstruction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2023年第4期6卷 451-463页

作者： Xingyu Gui Zhiyu Peng Ping Song li Chen Xiujuan Xu Hairui li Pei Tang Yixi Wang Zixuan Su Qingquan Kong Zhenyu Zhang zhengyong li Ying Cen Changchun Zhou Yujiang Fan Xingdong Zhang National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China Department of Thoracic Surgery West China HospitalSichuan UniversityChengdu 610041China Analytical and Testing Center Sichuan UniversityChengdu 610064China College of Biomedical Engineering Sichuan UniversityChengdu 610064China Department of Burn and Plastic Surgery West China HospitalSichuan UniversityChengdu 610041China Department of Orthopedics West China HospitalSichuan UniversityChengdu 610041China

At present,the clinical reconstruction of the auricle usually adopts the strategy of taking autologous costal *** method has great trauma to patients,poor plasticity and inaccurate ***-dimensional(3D)printing technology has made a great breakthrough in the clinical application of orthopedic *** study explored the combination of 3D printing and tissue engineering to precisely reconstruct the ***,a polylactic acid(PLA)polymer scaffold with a precisely customized patient appearance was fabricated,and then auricle cartilage fragments were loaded into the 3D-printed porous PLA scaffold to promote auricle *** vitro,gelatin methacrylamide(GelMA)hydrogels loaded with different sizes of rabbit ear cartilage fragments were studied to assess the regenerative activity of various autologous cartilage *** vivo,rat ear cartilage fragments were placed in an accurately designed porous PLA polymer ear scaffold to promote auricle *** results indicated that the chondrocytes in the cartilage fragments could maintain the morphological phenotype in *** three months of implantation observation,it was conducive to promoting the subsequent regeneration of cartilage in *** autologous cartilage fragments combined with 3D printing technology show promising potential in auricle reconstruction.

关键词： Microtia 3D printing Polylactic acid(PLA)polymer scaffolds Gelatin methacrylamide Cartilage reconstruction

Influence of hypercholesterolemia on the risk of chronic kidney disease in the middle-aged and elderly population and gender differences

在线全文

学校读者我要写书评

暂无评论

China Medical Abstracts(Internal Medicine) 2021年第3期38卷 176-177页

作者： li zhengyong Dept Nephrol 1st Affil HospZhengzhou UnivZhengzhou 450052

Objective To explore the influence of hypercholesterolemia on the risk of chronic kidney disease(CKD)in the middle-aged and elderly population and the gender *** The data came from the "Epidemiological Survey of Chron... 详细信息

关键词： Kidney kidney chronic

Recent progress and clinical applications of advanced biomaterials in cosmetic surgery

在线全文

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2023年第1期10卷 459-469页

作者： Hairui li Xiujuan Xu lina Wu Xi Chen Haris Akhter Yixi Wang Ping Song Xiaoxia liao Zhenyu Zhang zhengyong li Changchun Zhou Ying Cen Hua Ai and Xingdong Zhang Department of Plastic Reconstructive and Aesthetic Surgery West China Tianfu HospitalSichuan UniversityChengdu 610213China Department of Burn and Plastic Surgery West China School of MedicineWest China HospitalSichuan UniversityChengdu 610041China National Engineering Research Center for Biomaterials Sichuan UniversityChengdu 610064China College of Biomedical Engineering Sichuan UniversityChengdu 610064China Department of Orthopedic Surgery West China HospitalWest China School of MedicineSichuan UniversityChengdu 610041China Department of Plastic and Reconstructive Surgery University of Nebraska Medical CenterNebraska 68588USA

Materials of different allogeneic or xenogeneic or autologous origins are widely used as soft-tissue fillers or structural scaffolds in the field of cosmetic surgery,while complications including prosthesis infection,donor site deformity and filler embolization have always been difficult problems for plastic *** application of novel biomaterials may bring in hopeful solutions for these ***,some advanced biomaterials,such as regenerative biomaterials can effectively promote the repair of defective tissues,which have been proven to have good therapeutic as well as cosmetic effects in cosmetic ***,biomaterials with active compounds have drawn significant attention for the tissue regeneration of reconstructive and esthetic *** of these applications have achieved better clinical outcomes than traditional biological *** review summarized recent progress and clinical applications of advanced biomaterials in cosmetic surgery.

关键词： applications biomaterials cosmetic soft tissue scaffolds regenerative mechanism

liquid modified photonic crystal fiber for simultaneous temperature and strain measurement

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2017年第2期5卷 129-133页

作者： CHUPAO liN YING WANG YIJIAN HUANG CHANGRUI liAO ZHIYONG BAI MAOXIANG HOU zhengyong li YIPING WANG Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic Engineering Shenzhen University

A liquid modified photonic crystal fiber(PCF)integrated with an embedded directional coupler and multi-mode interferometer is fabricated by infiltrating three adjacent air holes of the innermost layer with standard 1.48 refractive index *** refractive index of the filled liquid is higher than that of background silica,which can not only support the transmitting rod modes but also the"liquid modified core"modes propagating between the PCF core and the liquid ***,the light propagating in the liquid modified core can be efficiently coupled into the satellite waveguides under the phase-matching conditions,resulting in a dramatic decrease of the resonant wavelength ***,there is a multi-mode interference produced by modified core modes and rod *** a compact(~0.91 cm)device integrated with an embedded coupler and interferometer is demonstrated for high-sensitivity simultaneous temperature(~14.72 nm∕℃)and strain(~13.01 pm∕με)measurement.

关键词： PCF liquid modified photonic crystal fiber for simultaneous temperature and strain measurement RIU

Ultralow-noise single-photon detection based on precise temperature controlled photomultiplier with enhanced electromagnetic shielding

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2017年第10期15卷 7-10页

作者： Mingyu Wang zhengyong li Yanhui Cai Yi Zhang Xiangkong Zhan Haiyang Wang Chongqing Wu Key Lab of Education Ministry on Luminescence and Optical Information Technology Beijing Jiaotong University Beijing 100044 China The Institute of Optics University of Rochester 275 Hutchison Road Rochester New York 14627 USA

We demonstrate an ultralow-noise single-photon detection system based on a sensitive photomultiplier tube（PMT） with precise temperature control, which can capture fast single photons with intervals around 10 *** improvement of the electromagnetic shielding and introduction of the self-differencing method, the dark counts（DCs） are cut down to ~1%. We further develop an ultra-stable PMT cooling subsystem and observe that the DC goes down by a factor of 3.9 each time the temperature drops 10°C. At -20°C it is reduced 400 times with respect to the room temperature（25°C）, that is, it becomes only 2 counts per second, which is on par with the superconducting nanowire detectors. Meanwhile, despite a 50% loss, the detection efficiency is still 13%. Our detector is available for ultra-precise single-photon detection in environments with strong electromagnetic disturbances.

关键词： PMT Ultralow-noise single-photon detection based on precise temperature controlled photomultiplier with enhanced electromagnetic shielding

在线全文

学校读者我要写书评

暂无评论

当前我国农村人才培训与成人教育

安徽农业科学 2009年第24期37卷 11785-11786页

作者：李振永四川农业大学远程与继续教育学院四川雅安625014

通过对我国农村人才培训必要性的综述,阐述了农村成人教育在人才培训中的重要作用,提出了农村成人教育与培训的实施策略。

关键词：农村人才培训成人教育策略