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Geothermal distribution characteristics and sedimentary basin geothermal system in the severe cold region of Northeast China

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Applied Geophysics 2020年第3期17卷 321-337页

作者： Fan Zhen-yu Xiong Sheng-Qing yu chang-chun Zhang Gui-Bin Zhang Xin-Yong Hu Bin School of Geophysics and Information Technology China University of Geosciences(Beijing)Beijing 100083China. China Aero Geophysical Survey&Remote Sensing Center for Natural Resources Beijing 100083China. Key Laboratory of Airborne Geophysics&Remote Sensing Geology Ministry of Natural ResourcesBeijing 10083China. Heilongjiang Provincial Ecological Geological Survey&Research Institute Heilongjiang 150030China

In this study,Shengli fault depression,Tangyuan fault basin,and northern Songliao Basin in Yitong‒Yilan fault zone of Heilongjiang province are considered the research areas for geothermal *** on the temperature of the deep thermal reservoir,the hydrothermal fl uid channel,caprock thickness,and the mode of heat transfer,which are the main factors controlling the geothermal reservoir formation,we examined geothermal resource system of the underground HDR in this ***,we inversed the aeromagnetic data,calculated the Curie isotherm depth,analyzed the geothermal distribution characteristics,and estimated the temperature of the deep heat ***,we applied the controlled source audio frequency magnetotelluric(CSAMT)and magnetotelluric(MT)methods to obtain the deep electrical structure of the study *** determined the thickness of the caprock and the hydrothermal fluid ***,we obtained the borehole geothermal steady-state temperature measurement data and water sample chemical analysis data from the logging temperature curves of 24 wells to infer the mode of heat *** on the results,we built a model of the geothermal system of the sedimentary basin in this *** results show that the depth of Curie isotherm in the study area is 17–39 *** resistivity of sedimentary caprock in the north of Songliao basin is low,and there exists a deep heat source,which is mainly thermal *** contrast,in Shengli and Tangyuan fault basins,heat conduction is *** on the geothermal system model,we conclude that the area from Daqing to Lindian in Songliao basin has a thermal-convection-dominated sedimentary basin geothermal *** exchange is realized by the upwelling of mantle-derived thermal materials through fracture *** thick sedimentary caprock reduces the heat *** can be a target for sustainable development and utilization of HDR.

关键词： Songliao basin Curie isotherm geothermal system HDR

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临床药师参与普外科围手术期镇痛治疗的效果研究

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中国现代药物应用 2024年第8期18卷 154-157页

作者：植伟文余日荣余长春蓝玲陆嫦萍广东省云浮市中医院临床药学科 527300 广东省云浮市中医院外三科 527300

目的探究临床药师参与普外科围手术期镇痛治疗的效果。方法100例进行普外科手术的患者,采用随机数字表法分为对照组与观察组,每组50例。对照组采取常规的镇痛方式,观察组在对照组基础上接受临床药师提供的围手术期药学服务。比较两组患... 详细信息

目的探究临床药师参与普外科围手术期镇痛治疗的效果。方法100例进行普外科手术的患者,采用随机数字表法分为对照组与观察组,每组50例。对照组采取常规的镇痛方式,观察组在对照组基础上接受临床药师提供的围手术期药学服务。比较两组患者术后出院时间、术后疼痛程度、治疗满意度、不良反应发生情况、P物质水平、去甲肾上腺素水平。结果观察组术后出院时间(9.66±0.87)d短于对照组的(10.07±0.91)d(t=2.302,P=0.023<0.05)。观察组术后12、24 h的数字疼痛评分量表(NRS)评分分别为(7.36±0.49)、(5.57±1.26)分,均低于对照组的(7.63±0.57)、(6.34±1.18)分(P<0.05)。观察组患者治疗满意度98.00%高于对照组的86.00%(P<0.05)。两组患者术后均未出现不良反应。观察组患者P物质(183.26±26.23)ng/ml、去甲肾上腺素(374.51±37.56)ng/ml均低于对照组的(195.62±29.41)、(392.34±32.34)ng/ml(P<0.05)。结论在普外科围术期阶段,由临床药师共同参与的镇痛治疗效果显著,有助于减轻患者疼痛症状,并提高患者的满意度,该方式在临床上具有较高的应用价值。

关键词：临床药师普外科围术期疼痛程度满意度不良反应

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Simple digital PWM and PSM controlled DC-DC boost converter for luminance-regulated WLED driver

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The Journal of China Universities of Posts and Telecommunications 2009年第2期16卷 98-102页

作者： LIU Xin GUO Shu-xu chang yu-chun ZHU Shun-dong WANG Shuai State Key Laboratory on Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 China

This article presents a control strategy based on simple digital pulse-width modulation （DPWM） and pulse-skip modulation （PSM） for a DC-DC boost converter, to drive a luminance-regulated white light emitting diodes （WLEDs）. The presented control strategy not only retains most of the advantages and flexibilities of traditional digital PWM, but also reduces complexity and cost. Based on analyzing the principle of the presented control strategy, the white light emitting diode （WLED） driver is designed and simulated using the 0.6 μm CMOS process. Simulation results of the boost converter show that the power efficiency is above 76% for a full load, with a peak efficiency of 88% when supply voltage varies from 2.7 V to 5.5 V. The control strategy overcomes low efficiency for PWM mode with light load.

关键词： DC-DC boost converter DPWM PSM WLED

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Analysis of Responsivity and Signal-to-Noise Ratio in PEPT

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Chinese Physics Letters 2012年第11期29卷 70-73页

作者： ZHOU Quan GUO Shu-Xu LI Zhao-Han SONG Jing-Yi chang yu-chun State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012

We analyze the responsivity and signal-to-noise ratio(SNR)of a punchthrough enhanced phototransistor(PEPT).Measurement results show that the PEPT exhibits a good response to light over a wide range of *** the responsivity is still as high as 106 A/W when the bias voltage is as low as 0.2 V,the device is suitable for ultra-low voltage ***,with 1–10μA bias current,the PEPT shows the best performance for the responsivity and *** incident light is as low as 3.8×10^(-8) W/cm^(2),the responsivity reaches approximately 108 A/*** super high responsivity of PEPTs makes it possible to fabricate small sized photodetector.

关键词： responsivity transistor Signal

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Microstructure Evolution and Nanomechanical Behavior of Micro-Area in Molten Pool of Selective Laser Melting(CoCrNi)_(82)Al_(9)Ti_(9)High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1019-1033页

作者： Hong-Wei Zhang Li-Wei Lan Zhe-yu Yang chang-chun Li Wen-Xian Wang College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Ministry of Education Key Laboratory of Interface Science and Engineering in Advanced MaterialsTaiyuan University of TechnologyTaiyuan030024China Shanxi-Zhejiang University New Materials and Chemical Research Institute Taiyuan030032China

In this work,the phase evolution mechanism and nanomechanical properties of(CoCrNi))(82)Al_(9)Ti_(9)high-entropy alloy(HEA)prepared by selective laser melting(SLM)in the molten pool were *** HEA contains multiple primary elements and undergoes high-temperature gradient and rapid cooling during *** leads to significant inhomogeneity of nano-scale microstructure characteristics and instability of *** optimizing process parameters,the microstructure evolution at the optimal parameter volume energy density of 440 J/mm^(3)was studied.A phase transition from BCC to FCC occurred in the melt *** the micro-area of the melt pool results in a temperature rise and the combustion-induced loss of Al ***,the Ni element content increases significantly outside the melt *** process enhances the phase stability of FCC and facilitates phase ***,rapid cooling leads to the formation of distinctive ultrafine equiaxial crystals inside the melt pool,accompanied by the generation of intracrystalline needle-like nano-scale *** the melt pool,the accumulation of energy results in the formation of coarse ***,the nano-hardness inside the molten pool is remarkably high at 11.79 GPa,while the outside the molten pool is reduced to 9.58 *** the fracture toughness outside the melt pool also *** with inside the melt pool,the residual stress outside the melt pool changed from compressive to tensile stress and decreased from 603.28 to 322.84 MPa.

关键词： High-entropy alloys Selective laser melting Microstructure evolution Nanoindentation

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One-step conversion of methane and formaldehyde to ethanol over SA-FLP dual-active-site catalysts: A DFT study

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Chinese Chemical Letters 2024年第4期35卷 544-548页

作者： Tao Ban Xi-Yang yu Hai-Kuo Tian Zheng-Qing Huang chun-Ran chang Shaanxi Key Laboratory of Energy Chemical Process Intensification School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an 710049China Shaanxi Key Laboratory of Low Metamorphic Coal Clean Utilization School of Chemistry and Chemical EngineeringYulin UniversityYulin 719000China

One-step conversion of methane and formaldehyde into ethanol is a 100% atom-efficient process for carbon resources utilization and environment protection but still faces eminent challenges due to the lacking of efficient catalysts. Therefore, developing active and stable catalysts is crucial for the co-conversion of methane and formaldehyde. Herein, twelve kinds of “Single-Atom”-“Frustrated Lewis Pair”(SA-FLP)dual-active-site catalysts are designed for the direct conversion of methane and formaldehyde to ethanol based on density functional theory(DFT) calculations and microkinetic simulations. The results show that the SA-FLP dual active sites can simultaneously activate methane at the SA site and activate formaldehyde at the FLP site. Among the twelve designed SA-FLP catalysts, Fe1-FLP shows the best performance in the co-conversion of methane and formaldehyde to ethanol with the rate-determining barrier of 1.15 e *** is proved as the main product with the turnover frequency of 1.32 × 10^(-4)s^(-1)at 573 K and 3 *** work provides a universal strategy to design dual active sites on metal oxide materials and offers new insights into the effective conversion of methane and formaldehyde to desired C_(2) chemicals.

关键词： Single-atom Frustrated Lewis pairs Methane conversion Dual active sites Ethanol synthesis

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A homopolymolybdate-supported plate-like 2D cobalt network constructed from a new pyrazole-amide-pyridyl ligand: highly electrochemical activity in both capacitive performance and the detection of Cr(Ⅵ)

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Tungsten 2024年第2期6卷 422-427页

作者： Xiu-Li Wang Yong-Zhen Chen Zhi-Han chang yu-chun Lin Jing-Yi Ma College of Chemistry and Materials Engineering Bohai UniversityJinzhou 121013China Professional Technology Innovation Center of Liaoning Province for Conversion Materials of Solar Cell Jinzhou 121013China

By employing a new semi-rigid pyrazole-amide-derived bis(pyridyl)ligand[N,N'-bis(4-picolylamine)-1-hydropyrazole(4-dpap)],a new homopolymolybdate-based two-dimensional(2D)plate-like complex[Co(4-dpap)(H_(2)O)(β-Mo_(8)O_(2)6)1/2](1)has been prepared under solvothermal condition and structurally ***β-Mo_(8)anions are fi xed between the 2D metal–organic networks[Co(4-dpap)(H_(2)O)]n 2n+via hydrogen-bonding *** 1 possesses satisfactory specifi c capacitance of 1512.4 F·g^(−1)(current density:1 A·g^(−1))and good cycling stability(90.8%after 1000 cycles).Moreover,1 represents a promising amperometric sensor for measurement of Cr(Ⅵ)with low detection limit(0.042μmol·L^(−1))and high *** insertion ofβ-Mo_(8)anions between the unique 2D metal−organic networks improves the active area of polyoxometalates,which further promotes electrochemical performance.

关键词： Homopolymolybdate Metal–organic network Pyrazole-amide-derived bis(pyridyl)ligand Supercapacitor Electrochemical sensor

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3D inversion modeling of joint gravity and magnetic data based on a sinusoidal correlation constraint

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Applied Geophysics 2019年第4期16卷 519-529,561,562页

作者： Gao Xiu-He Xiong Sheng-Qing Zeng Zhao-Fa yu chang-chun Zhang Gui-Bin Sun Si-yuan China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Beijing 100083China School of Geophysics and Information Technology China University of Geosciences(Beijing)Beijing 100029China College of GeoExploration Science and Technology Jilin UniversityChangchun 130000China.

Joint inversion based on a correlation constraint utilizes a linear correlation function as a structural *** linear correlation function contains a denominator,which may result in a singularity as the objective function is optimized,leading to an unstable inversion *** improve the robustness of this calculation,this paper proposes a new method in which a sinusoidal correlation function is employed as the structural constraint for joint inversion instead of the conventional linear correlation *** structural constraint does not contain a denominator,thereby preventing a *** with the joint inversion method based on a cross-gradient constraint,the joint inversion method based on a sinusoidal correlation constraint exhibits good *** application to actual data demonstrates that this method can process real data.

关键词： joint inversion gravity and magnetic data correlation sine function

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Enhanced Crystallization of Poly(butylene adipate-co-terephthalate)by a Self-assembly Nucleating Agent

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Chinese Journal of Polymer Science 2024年第5期42卷 663-674,I0010页

作者： Cheng Zhou Kun Chen Zi-Heng Zhang Meng-Fan Jing chun-Tai Liu chang-yu Shen Ya-Ming Wang State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China

Poly(butylene adipate-co-terephthalate)(PBAT)is a promising biodegradable flexible polymer but suffers from slow crystallization rate,making it less attractive for some applications like the injection-molded products in comparison with low-density polyethylene(LDPE).This work aimed to accelerate the crystallization of PBAT by adding a self-assembly nucleating agent octamethylenedicarboxylic dibenzoylhydrazide(OMBH).PBAT/OMBH composites with various OMBH contents(0 wt%,0.5 wt%,0.7 wt%,1 wt%,2 wt%,3 wt%and 5 wt%)were prepared through *** effect of OMBH on the crystallization behavior,morphologies and mechanical properties of PBAT was *** highest nucleation efficiency value of 59.6%was achieved for PBAT with 0.7 wt%OMBH,much higher than that of 22.7%for PBAT with 0.7 wt%*** force microscopy results showed that OMBH formed fine fibers and induced the formation of transcrystalline layers of *** transform infrared spectroscopy(FTIR)combined with two-dimensional correlation spectra suggested that the intermolecular dipole-dipole N—H…O=C interactions but not hydrogen bond between OMBH and PBAT promoted the crystallization of PBAT in the initial period of *** presence of OMBH did not change the crystal form of PBAT but had positive contribution in enhancing its crystallinity and mechanical *** work is essential for preparing PBAT with high crystallization rate,enhancing its potential applications in injection-molded products.

关键词： Poly(butylene adipate-co-terephthalate) Biodegradable Self-assembly nucleating agent Crystallization

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Breakthrough in Li-mediated continuous electrosynthesis of ammonia

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Science China Chemistry 2024年第10期67卷 3191-3192页

作者： Fei Zhan chang yu State Key Laboratory of Chemical Resource Engineering College of Chemical EngineeringBeijing University of Chemical Technology State Key Laboratory of Fine Chemicals Liaoning Key Lab for Energy Materials and Chemical EngineeringSchool of Chemical EngineeringDalian University of Technology

Ammonia（NH3） ranks among the manufactured chemicals,with an annual production surpassing 182 million tons [1],which is an indispensable raw material for fertilizer industry and has been recognized as a promising car...

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