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wide tunable laser based on electrically regulated bandwidth broadening in polymer-stabilized cholesteric liquid crystal

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Photonics Research 2019年第2期7卷 137-143页

作者： HONGBO LU CHENG WEI QIANG ZHANG MIAO XU YUNSHENG DING GUOBING ZHANG JUN ZHU KANG XIE XIAOJUAN ZHANG ZHIJIA HU LONGZHEN QIU Key Laboratory of Special Display Technology National Engineering Laboratory of Special Display TechnologyState Key Laboratory of Advanced Display TechnologyAcademy of Opto-Electronic TechnologyHefei University of Technology Key Laboratory of Advanced Functional Materials and Devices Anhui ProvinceSchool of Chemistry and Chemical EngineeringHefei University of Technology School of Instrument Science and Opto-Electronics Engineering Hefei University of Technology Aston Institute of Photonic Technologies Aston University State Key Laboratory of Environment-Friendly Energy Materials Southwest University of Science and Technology

Electrically responsive photonic crystals represent one of the most promising intelligent material candidates for technological applications in optoelectronics. In this research, dye-doped polymer-stabilized cholesteric liquid crystals(PSCLCs) with negative dielectric anisotropy were fabricated, and mirrorless lasing with an electrically tunable wavelength was successfully achieved. Unlike conventional liquid-crystal lasers, the proposed laser aided in tuning the emission wavelength through controlling the reflection bandwidth based on gradient pitch distribution. The principal advantage of the electrically controlled dye-doped PSCLC laser is that the electric field is applied parallel to the helical axis, which changes the pitch gradient instead of rotating the helix axis, thus keeping the heliconical structure intact during lasing. The broad tuning range(～110 nm) of PSCLC lasers,coupled with their stable emission performance, continuous tunability, and easy fabrication, leads to its numerous potential applications in intelligent optoelectronic devices, such as sensing, medicine, and display.

关键词： wide tunable laser electrically polymer-stabilized

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Safe mining practices under wide spans in underground non-caving mines——Case studies

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International Journal of Mining Science and Technology 2019年第4期29卷 535-540页

作者： J.J.Ran Kinross Gold Corporation

Mining under wide span is of concern as it increases the probability of back caving causing personnel injury and equipment damage in underground mines in open stoping and underhand drift-and-fill methods.Though restricting personnel access to well supported lateral development is commonly practiced,it is not always possible to implement this requirement due to various factors such as ore loss control,drilling equipment limitations,availability of remote operating capacity and consideration of productivity.Even with rules implemented to limit personnel entry into openings with wide spans,the hazards of equipment damage and back caving still exist.Over the years,different practices have been reported and adopted to minimize risks associated with exposure to large spans in various underground mines.Lessons from these practices are beneficial to current and future mines with challenges of safe extraction of thick deposits in a non-caving setting.This paper briefly summarizes practices in mining wide orebodies using the open stoping method without personnel access and underhand mining using the drift-andfill method with personnel exposure in the industry and presents cases from Kinross mines where the hanging pillar design was tested,and stope backs were naturally and artificially supported for extraction under wide spans using the open stoping method.

关键词： Mine safety wide span Back stability Underhand mining Hanging pillar

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Material basis for inhibition of Dragon's Blood on evoked discharges of wide dynamic range neurons in spinal dorsal horn of rats

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Science China(Life Sciences) 2008年第11期51卷 1025-1038页

作者： GUO Min, CHEN Su & LIU XiangMing Department of Biological & Medical Engineering, South-Central University for Nationalities, Wuhan 430074, China Department of Biological & Medical Engineering South-Central University for Nationalities Wuhan China

In vivo experiments were designed to verify the analgesic effect of Dragon’s Blood and the material basis for this effect. Extracellular microelectrode recordings were used to observe the effects of Dragon’s Blood and various combinations of the three components (cochinchinenin A, cochinchinenin B, and loureirin B) extracted from Dragon’s Blood on the discharge activities of wide dynamic range (WDR) neurons in spinal dorsal horn (SDH) of intact male Wistar rats evoked by electric stimulation at sciatic nerve. When the Hill's coefficients describing the dose-response relations of drugs were dif-ferent, based on the concept of dose equivalence, the equations of additivity surfaces which can be applied to assess the interaction between three drugs were derived. Adopting the equations and Tal-larida's isobole equations used to assess the interaction between two drugs with dissimilar dose-response relations, the effects produced by various combinations of the three components in modulating the evoked discharge activities of WDR neurons were evaluated. Results showed that Dragon’s Blood and its three components could inhibit the evoked discharge frequencies of WDR neurons in a concentration-dependent way. The Hill's coefficients describing dose-response relations of three components were different. Only the combined effect of cochinchinenin A, cochinchinenin B and loureirin B was similar to that of Dragons Blood. Furthermore, the combined effect was synergistic. This investigation demonstrated that through the synergistic interaction of the three components Dragon’s Blood could interfere with the transmission and processing of pain signals in spinal dorsal horn. All these further proved that the combination of cochinchinenin A, cochinchinenin B, and loureirin B was the material basis for the analgesic effect of Dragon’s Blood.

关键词： Dragon’s Blood material basis for the efficacy extracellular microelectrode recordings wide dynamic range neurons interaction between drugs

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Electron Cyclotron Resonance Deposition of wide Bandgap a-SiC:H Films Using Acetylene under High Hydrogen Dilution

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Journal of Materials Science & Technology 1997年第3期13卷 189-193页

作者： S.F.Yoon and J.Ahn(School of Electrical and Electronic Engineering, Nanyang Technological University Nanyang Avenue, Singapore 639798,Rep. of Singapore) School of Electrical and Electronic Engineering Nanyang Technological University Nanyang Avenue Singapore 639798 Singapore

The deposition of hydrogenated amorphous silicon carbide (a-SiC.H) films from a mixture of silane, acetylene and hydrogen gas using the electron cyclotron resonance chemical vapour deposition (ECR-CVD) process is reported. The variation of the deposition and film characteristics such as the deposition rate- optical bandgap, photoluminescence and the infra-red (IR) absorption as a function of the hydrogen dilution is investigated. The deposition rate increases to a maximum value of ~25 nm/min at a moderate hydrogen diIution ratio of ~20 [hydrogenflow (sccm)/acetylene+silane flow (sccm)], and decreases in response to a further increase in the hydrogen dilution. There is no strong dependence of the optical bandgap on the hydrogen dilution within the dilution range investigated (10 to 60), and the optical bandgap calculated from the E04 method varied marginally from ~2.85 eV to ~3.17 eV. The room temperaturephotoluminescence (PL) peak energy and intensity shows a prominent shift to a maximum value of ~2.17 eV corresponding to maximum PL intensity at a moderate hydrogen diIution of ~30.The PL intensity shows a strong dependence on the hydrogen dilution variation. IR absorption results show that films deposited at higher hydrogen dilution have more Si-C bonding.

关键词： SiC wide Electron Cyclotron Resonance Deposition of wide Bandgap a-SiC

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Implementation and performance evaluation of advance metering infrastructure for Borneo-wide Power Grid

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Frontiers in Energy 2020年第1期14卷 192-211页

作者： Mujahid TABASSUM Manas K.HALDAR Duaa Fatima S.KHAN Faculty of Engineering Computing and ScienceSwinburne University of TechnologyKuching93350Malaysia

In this paper,a supervisory computer network for Borneo-wide Power Grid system have been proposed and implemented,which includes a renewable power generation and advanced metering infrastructure.An Internet-based communication network running on multi-protocol label switching(MPLS)has been implemented for a smart power grid,with the addition of the renewable energy monitoring system.The centralized supervisory control and data acquisition systems(SCADA)are replaced by a wide area monitoring system(WAMS)comprising of a phasor measurement unit(PMU).The implemented communication network used advanced metering infrastructure that operates on worldwide interoperability for microwave access(WiMAX),wireless fidelity(Wi-Fi)and low power Wi-Fi,which are proposed for the distribution systems of Sarawak Energy.The proposed wide area network(WAN)is simulated using OPNET Modeler and the results are compared with the existing WAN used by Sarawak Energy.

关键词： renewable energy multiprotocol label switching(MPLS) power grid phasor measurement unit(PMU) supervisory control and data acquisition systems(SCADA) wide area monitoring system(WAMS) worldwide interoperability for microwave access(WiMAX) synchronous digital hierarchy(SDH)

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wide pillar roadway retained in the deep high gas coal seam

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International Journal of Mining Science and Technology 2012年第6期22卷 828-831页

作者： Pan Liyou Feng Enhu Zhao Qingshou Chen Liqiang Kong Fanpeng Institute of Mining Engineering Shandong University of Science and Technology Bao'an Mine Shanxi Coal Transportation and Sales Group Co.Ltd. College of Natural Resources and Environmental Engineering Shandong University of Science and Technology

According to the geological and mining conditions of deep high gas coal seam,this paper established the mechanical model of stope surrounding rock,and analyzed the stress distribution and deformation failure mechanism of working face and coal pillar.The research determined the arrangement mode that adjacent working faces retain wide pillar,and the reasonable support method of roadway that the combined support of roof and grouting combined together.The reasonable time of reinforced roadway was determined.Through analyzing the mechanical model of the ways of roadway supporting,this research drew the conclusions as follows:the combined support of roof and working slope improved the support strength and range of surrounding rock,optimized the support by adjusting the angle of anchor,and reached the support requirements by using cement grouting in working slope and chemical grout in roof.The technology was applied in 15104 working face of Baoan Mine,and obtained good results.

关键词： Gas Roadway retained wide pillar Stress distribution Combined support of roof and working slope Grouting

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Automatic Discovery of Information Resources on the World wide Web

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Journal of Donghua University(English Edition) 2002年第1期19卷 88-93页

作者：朱国进陈家训 Coll. of Info. Sci. and Technol. Dong Hua Univ. Shanghai 200051 China

A basis for automatic discovery of information resources on the World wide Web is characterized by three underlying equations. With these equations, the information universe on the Web is divided into three associated spaces. This model differs from the hypertext employed by the Web, in that the former supports the notion of automatic resource discovery. A private library, which is able to gather automatically from the Web the information useful to the library owner, is envisaged to illustrate that the basic equations and their derivations can be applied to Web automation, including crawling and classifying.

关键词： World wide Web, Resource discovery, Web automation.

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Hernia mesh prevent dislocation after wide excision and reconstruction of giant cell tumor distal radius

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World Journal of Orthopedics 2017年第9期8卷 741-746页

作者： I Gede E Wiratnaya I Gusti Bagus Arie M Budiartha I Gusti Ngurah Y Setiawan Dwijo A Sindhughosa I Ketut S Kawiyana Putu Astawa Department of Orthopedic and Traumatologic Faculty of Medicine Udayana University Sanglah General Hospital Faculty of Medicine Udayana University Sanglah General Hospital

Giant cell tumor(GCT) remains as major health problem. GCT which located at the lower end of the radius tends to be more aggressive. wide excision and reconstruction of the wrist in stage 3 of distal radius GCT lesion is an optimal modality to prevent tumor recurrence. However, dislocation often occurs as its complication. We are reporting patient with GCT of distal radius treated with wide excision and reconstruction using nonvascularized fibular graft and the addition of hernia mesh. Circumferential non-absorbable polypropylene hernia mesh was applied, covered radioulnar joint and volar aspect of radius, and served as additional support to prevent dislocation. During five years and two months of follow-up, we found no dislocation in our patient. Furthermore, good functional outcome was obtained. Our finding suggests that the addition of hernia mesh after wide excision and reconstruction with nonvascularized fibular graft may benefit to prevent dislocation and provides an excellent functional outcome.

关键词： Giant cell tumor wide excision Fibular graft Hernia mesh Dislocation

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Multi-dimensional ambiguity function for subarray-based space-time coding radar

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Journal of Systems Engineering and Electronics 2019年第5期30卷 886-896页

作者： LAN Lan LIAO Guisheng XU Jingwei WANG Hanbing National Laboratory of Radar Signal Processing Xidian University

Space-time coding radar has been recently proposed and investigated.It is a radar framework which can perform transmit beamforming at the receiver.However,the range resolution decreases when the number of the transmit element increases.A subarray-based space-time coding(sub-STC)radar is explored to alleviate the range resolution reduction.For the proposed radar configuration,an identical waveform is transmitted and it introduces a small time offset in different subarrays.The multidimensional ambiguity function of sub-STC radar is defined by considering resolutions in multiple domains including the range,Doppler,angle and probing direction.Analyses on properties of the multi-dimensional ambiguity function of the sub-STC radar with regard to the spatial coverage,resolution performance and low sidelobes are also given.Results reveal that the range resolution and low sidelobes performance are improved with the proposed approach.

关键词： space-time coding radar multi-dimensional ambiguity function range resolution wide spatial coverage subarray sidelobe

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Power system low frequency oscillation monitoring and analysis based on multi-signal online identification

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Science China(Technological Sciences) 2010年第11期53卷 2589-2596页

作者： YUAN Ye1,2,SUN YuanZhang2,CHENG Lin2,CHEN Gang2 & WANG Peng3 1 State Nuclear Electric Power Planning Design and Research Institute,Beijing 100032,China 2 State Key Laboratory of Power Systems,Deptment of Electrical Engineering,Tsinghua University,Beijing 100084,China 3 EEE School,Nanyang Technological University,Singapore State Nuclear Electric Power Planning Design and Research Institute Beijing China State Key Laboratory of Power Systems Deptment of Electrical Engineering Tsinghua University Beijing China EEE School Nanyang Technological University Singapore Singapore

The advance in the wide-area measurement system (WAMS) is driving the power system to the trend of wide-area monitoring and control.The Prony method is usually used for low frequency oscillation online identification.However,the identified amplitude and phase information is not sufficiently used.In this paper,the amplitude is adopted to detect the occurrence of the oscillation and to obtain the mode observability of the sites.The phase is adopted to identify the oscillation generator grouping and to obtain the mode shapes.The time varying characteristics of low frequency oscillations are studied.The behaviors and the characters of low frequency oscillations are displayed by dynamic visual techniques.Demonstrations on the "11.9" low frequency oscillation of the Guizhou Power Grid substantiate the feasibility and the validation of the proposed methods.

关键词： wide area measurement system (WAMS) low frequency oscillation Prony algorithm mode observability

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