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Design of Gas Sensors Circuits with in-System Programmable Ddevices

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稀有金属材料与工程 2006年第A3期35卷 146-147页

作者： Duren liu Jin liu Zhichun ren Xidian University Xi＇an 710071 China

In-system programmable devices are products that combined modern electronic techniques and semiconductor *** are indispensable devices in designing modern circuits and *** paper presents two practical circuits designed with programmable devices and its design *** introducing programmable devices into gas sensor circuits,we can further improve system reliability,stability,sensitivity and integration degree,and enhance flexibility of system design.

关键词： in-system programmable device gas sensor music warning circuit gas sensor measurement circuit

Tectonic-Hydrocarbon Accumulation of Laoyemiao Region in the Nanpu Sag,Bohai Bay Basin

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Acta Geologica Sinica(English Edition) 2009年第5期83卷 951-961页

作者： ZHANG Cuimei liu Xiaofeng ren Jianye Key Laboratory of Tectonics and Petroleum Resources China University of Geosciences Wuhan 430074 China

This paper aims to gain insight into Laoyemiao （LYM） tectonic features and utilizes the tectonic-hydrocarbon accumulation model by integrated analysis tectonic controls on suitable reservoirs, trap styles, and hydrocarbon migration. On the basis of 3-D seismic data interpretation and the Xi＇nanzhuang （XNZ） Fault geometry analysis, it has been assessed that the LYM tectonics is essentially a transverse anticline produced by flexure of the XNZ Fault surface and superimposed by Neocene north-east-trending strike-slip faults. Transverse anticline is found to exert controls both on major sediment transportation pathways and sedimentary facies distribution. Fan-delta plains that accumulated on the anticline crest near the XNZ Fault scrap and fan-delta front on the anticline front and the upper part of both limbs slumps on synclines and the Linque subsag. In combination with the reservoir properties, suitable reservoirs are predicted in the subfacies of subaqueous distributary channel and mouth bar deposited on the anticline crest. The LYM-faulted anticline accounts for the following trap groups： faulted-block and anticline-dominated trap, fault-dominated traps, and combined and stratigraphic traps. Evidence from biomarkers of crude oil and hydrocarbon-filling period simultaneous, or a little later to the strike-slip fault activity, reveal that the *** faults penetrating into the deep source rock, by connecting with shallow reservoirs, provide the major hydrocarbon migration pathways.

关键词： tectonic-hydrocarbon accumulation Laoyemiao region Nanpu sag

On the diffuse soft X-ray emission from the nuclear region of M51

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Research in Astronomy and Astrophysics 2015年第12期15卷 2164-2172页

作者： Ji-ren liu Shu-De Mao National Astronomical Observatories Chinese Academy of Sciences Physics Department and Tsinghua Center for Astrophysics Tsinghua University Jodrell Bank Centre for Astrophysics University of Manchester

We present an analysis of the diffuse soft X-ray emission from the nuclear region of M51 combining both XMM-Newton RGS and Chandra data. Most of the RGS spectrum of M51 can be fitted with a thermal model with a temperature of 0.5 keV except for the O vii triplet, which is forbidden-line dominated. The Fe L-shell lines peak around the southern cloud, where the O viii and N vn Lya lines also peak. In contrast, the peak of the O vii forbidden line is about 10＂ offset from that of the other lines, indicating that it is from a spatially distinct component. The spatial distribution of the O vii triplet mapped by the Chandra data shows that most of the O vii triplet flux is located at faint regions near edges, instead of the southern cloud where other lines peak. This distribution of the O vii triplet is inconsistent with the photoionization model. Other mechanisms that could produce the anomalous O vii triplet, including a recombining plasma and charge exchange X-ray emission, are discussed.

关键词： atomic processes -- plasmas -- ISM: jets and outflows -- galaxies:Seyfert -- galaxies: individual: M51 (NGC 5194) -- X-rays: ISM

Synthesis and Properties of IPN Hydrogels Based on Konjac Glucomannan and Poly(acrylic acid)

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Chinese Chemical Letters 2006年第10期17卷 1377-1380页

作者： Bing liu Zhi Lan liu ren Xi ZHUO Key Laboratory of Biomedical Polymers of Ministry of Education Department of Chemistry Wuhan University Wuhan 430072

Novel interpenetrating polymer network （IPN） hydrogels based on konjac glucomannan （KGM） and poly（acrylic acid）（PAA） were prepared by polymerization and cross-linking of acrylic acid （AA） in the pre-fabricated KGM gel. The IPN gel was analyzed by FF-IR. The studies on the equilibrium swelling ratio of IPN hydrogels revealed their sensitive response to environmental pH value. The results of in vitro degradation showed that the IPN hydrogels retain the enzymatic degradation character of KGM.

关键词： Hydrogel interpenetrating polymer network pH-sensitivity konjac glucomannan poly(acrylic acid).

Preparation and Properties of Aqueous SCNTs Dispersion based on A UV-curable Polymeric Dispersant

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Journal of Wuhan University of Technology(Materials Science) 2018年第2期33卷 485-491页

作者：袁妍 WU Haiqiang liu Jingcheng LUO Jing liu ren liu Xiaoya The Key Laboratory of Synthestic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan University

A novel photosensitive copolymer P（SS-co-AA-g-GMA）（PSAG） was synthesized and utilized to noncovalently functionalize pristine single-walled carbon nanotubes（SCNTs）. PSAG was highly effective for the solubilization of SCNTs in water and validated by UV-vis absorption spectra experiments, resulting in homogeneous and stable PSAG-SCNT aqueous dispersion. The microstructure of SCNTs was observed through Raman spectroscopy and transmission electron microscopy. In addition, compared with the two common polymeric dispersants of Triton X-100 and PSS, PSAG demonstrated more effective performances for dispersing SCNTs under identical conditions. Furthermore, the photosensitive PSAG-SCNTs can be crosslinked after UV irradiation, leading to significant improvement in the water resistance of SCNT films. UV-cured films can be transferred to plastic wrap to form a flexible film with high electrical conductivity.

关键词： single-walled carbon nanotubes(SCNTs) polymeric dispersant UV-curable conductive water resistance

Rapid growth of ZnO hexagonal prism crystals by direct microwave heating

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Rare Metals 2008年第5期27卷 517-521页

作者： ZHU Zhenqi ZHOU Jian liu Guizhen ren Zhiguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

ZnO hexagonal prism crystals were synthesized from ZnO powders by microwave heating in a short time （within 20 min） without any metal catalyst or transport agent. Zinc oxide raw materials were made by evaporating from the high-temperature zone in an enclosure atmosphere and crystals were grown on the self-source substrate. The inherent asymmetry in microwave heating provides the temperature gradient for crystal growth. Substrate and temperature distribution in the oven show significant effects on the growth of the ZnO crystal. The morphologies demonstrate that these samples are pure hexagonal prism crystals with maximum 80 lain in diameter and 600 lure in length, which possess a well faceted end and side surface. X-ray diffraction （XRD） reveals that these samples are pure crystals. The photoluminescence （PL） exhibits strong ultraviolet emission at room temperature, indicating potential applications for short-wave light-emitting photonic devices.

关键词： zinc oxide prism crystal microwave heating vapor growth

Resonance Fluorescence Spectrum by Two-Level System Without the Rotating Wave Approximation

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Chinese Physics Letters 1999年第1期16卷 23-25页

作者： liu ren-hong TAN Wei-han Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 Department of Physics Shanghai UniversityShanghai 201800

In this paper the theory of resonance fluorescence spectrum by two-level system is presented without the assumption of rotating wave ***,in this case,the application of quantum fluctuation-regression theorem to evaluate the resonance fluorescence spectrum takes a more complicated *** prominent features of the spectrum calculated are the double splitting on the central and side bands and the emergence of harmonics in the asymmetric spectra.

关键词： spectra. spectrum Approximation

Nonlinear Control of Chaos

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Chinese Physics Letters 1998年第4期15卷 249-251页

作者： liu ren-hong TAN Wei-han Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800 Department of Physics Shanghai UniversityShanghai 201800

The nonlinear and the exact control of chaos is *** these methods we achieve a simultaneous and instantaneous control of the scheduled unstable 2^(k)p points for the logistic and the Henon *** derivatives needed in the nonlinear method have been evaluated experimentally from the time series xn,without the pre-knowledge of the function f(x).The difficulty confronted in the optimum control may be overcome by introducing the nonlinear control.

关键词： nonlinear overcome Chaos

Light Trapping Effect in Wing Scales of Butterfly Papilio peranthus and Its Simulations

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Journal of Bionic Engineering 2013年第2期10卷 162-169页

作者： Zhiwu Han Shichao Niu Lufeng Zhang Zhenning liu Luquan ren Key Laboratory of Bionic Engineering (Ministry of Education China) Jilin University Changchun 130022 P. R. China

Broadband light trapping effect and arrays of sub-wavelength textured structures based on the butterfly wing scales are applicable to solar cells and stealth technologies. In this paper, the fine optical structures in wing scales of butterfly Papilio peranthus, exhibiting efficient light trapping effect, were carefully examined. First, the reflectivity was measured by reflectance spectrum. Field Emission Scanning Electronic Microscope （FESEM） and Transmission Electron Microscope （TEM） were used to observe the coupling morphologies and structures of the scales. Then, the optimized 3D model of the coupling structure was created combining Scanning Electron Microscope （SEM） and TEM data. Afterwards, the mechanism of the light trapping effect of these structures was analyzed by simulation and theoretical calculations. A multilayer nano-structure of chitin and air was found. These structures are effective in increasing optical path, resulting in that most of the incident light can be trapped and adsorbed within the structure at last. Furthermore, the simulated optical results are consistent with the experimental and calculated ones. This result reliably confirms that these structures induce an efficient light trapping effect. This work can be used as a reference for in-depth study on the fabrication of highly efficient bionic optical devices, such as solar cells, photo detectors, high-contrast, antiglare, and so forth.

关键词： butterfly wing scale light trapping structures biomimetic functional surfaces