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低碳视角下云南省国土空间利用效率测度及综合分区

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水土保持通报 2024年第5期44卷 347-357页

作者：陶俊逸叶显民汪小宝周玉琴冉玉菊熊波董雯雯赵筱青云南大学地球科学学院云南昆明650500 云南大学国际河流与生态安全研究院云南昆明650500 云南省国土资源规划设计研究院云南昆明650500

[目的]在碳中和背景下进行云南省国土空间利用效率测度及空间综合分区,为提出差异化国土空间低碳、高效发展策略提供科学参考。[方法]利用2020年云南省16个州市单元面板数据,基于非期望超效率SBM模型测度低碳视角下的国土空间利用效率,... 详细信息

[目的]在碳中和背景下进行云南省国土空间利用效率测度及空间综合分区,为提出差异化国土空间低碳、高效发展策略提供科学参考。[方法]利用2020年云南省16个州市单元面板数据,基于非期望超效率SBM模型测度低碳视角下的国土空间利用效率,并结合碳效益指数划分综合分区,提出各区优化建议。[结果]①2020年云南省碳排放量为1.23×10^(8)t,其中生产空间碳排放远大于生活空间,前者几乎是后者的31倍,碳吸收量为1.40×10^(7)t,仅为碳排放量的1/10。②2020年云南省国土空间利用效率仅为0.628,呈现出滇中和滇西北较高,滇东、滇西南较低的空间分布格局;具体到各州市,仅西双版纳、迪庆和玉溪达到高效利用,效率最大值为1.430,而昭通市利用效率最低,仅为0.490。③基于国土空间利用效率与碳效益指数,最终形成低碳保持-高效率、碳汇功能-高效率、碳汇功能-中等效率、碳汇功能-低效率、碳强度控制-高效率、碳强度控制-中等效率和高碳优化-低效率7个综合分区,并提出各区差异化管治策略。[结论]当前云南省碳吸收远不足以抵消碳排放,整体表现为碳源,国土空间利用仍较为粗放,利用效率还有很大提升潜力,国土空间利用效率分布具有明显的区域非均衡性,在制定国土空间低碳发展与高效利用策略时应予以重视。

关键词：碳中和国土空间利用效率非期望超效率SBM模型国土空间综合分区云南省

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超高效液相色谱-串联质谱法检测全血中的东莨菪碱和阿托品

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刑事技术 2017年第2期42卷 133-136页

作者：佘彩蒙杜鸿雁王芳琳何洪源王小宝中国人民公安大学北京100038 公安部物证鉴定中心北京100038 广州市公安局越秀区分局刑警大队广州510080

本文旨在建立一种基于超高效液相色谱-串联质谱(UPLC-MS/MS)检测全血中的东莨菪碱和阿托品的快速检验方法。全血样品经乙腈沉淀蛋白,振荡、离心提取后,上清液过0.22μm有机滤膜,上机检测。UPLC-MS/MS检测方法选用Agilent Eclipse Plus C... 详细信息

本文旨在建立一种基于超高效液相色谱-串联质谱(UPLC-MS/MS)检测全血中的东莨菪碱和阿托品的快速检验方法。全血样品经乙腈沉淀蛋白,振荡、离心提取后,上清液过0.22μm有机滤膜,上机检测。UPLC-MS/MS检测方法选用Agilent Eclipse Plus C_(18)色谱柱,以0.1%甲酸水溶液-乙腈为流动相,进行梯度洗脱,流速为0.4mL/min。东莨菪碱和阿托品在1~100ng/mL范围内线性良好,线性系数分别为0.9997、0.9968,平均回收率分别为93.99%、97.71%,日内与日间精密度均小于10%。东莨菪碱与阿托品的最低检出限(LOD S/N=3)均为0.2ng/mL,最低定量限(LOQ S/N=10)均为1ng/mL。该方法快速简便,灵敏度高,可用于人全血中东莨菪碱与阿托品的定性定量检测。

关键词：东莨菪碱阿托品液相色谱-质谱联用快速检验

改良环状软骨上喉部分切除术治疗声门型喉癌的临床价值

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现代肿瘤医学 2016年第23期24卷 3718-3720页

作者：王晓侠姚小宝李宏慧白艳霞申震西安交通大学第一附属医院耳鼻喉科陕西西安710061 解放军451医院耳鼻喉科陕西西安710054

目的：总结改良环状软骨上喉部分切除术治疗声门型喉癌的经验,评价该术式对保留喉功能的价值。方法：选取26例声门型喉癌进行改良环状软骨上喉部分切除术,总结其手术方法。结果：1例出现环状软骨脱垂及喉狭窄,3例出现皮下感染,余患者均... 详细信息

目的：总结改良环状软骨上喉部分切除术治疗声门型喉癌的经验,评价该术式对保留喉功能的价值。方法：选取26例声门型喉癌进行改良环状软骨上喉部分切除术,总结其手术方法。结果：1例出现环状软骨脱垂及喉狭窄,3例出现皮下感染,余患者均恢复良好。随访3~5年,2例患者死亡。结论：应用改良环状软骨上喉部分切除术能改善患者的发音质量,缩短吞咽功能恢复时间,提高拔管率,并且不影响生存率。改良环状软骨上喉部分切除术对声门型喉癌有积极的治疗意义。

关键词：喉肿瘤喉切除术功能恢复

Molecular Dynamics Simulations of Displacement Cascade in Ni-Based Concentrated Solid Solution Alloys

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Acta Mechanica Solida Sinica 2024年第1期37卷 82-89页

作者： Chaoquan Zhao Rongxuan Xie Chuanlong Xu xiaobao Tian Qingyuan wang Wentao Jiang Haidong Fan Department of Mechanics Sichuan UniversityChengdu 610065China

Single-phase concentrated solid solution alloys(SP-CSAs),including high-entropy alloys,have received extensive attention due to their excellent irradiation *** this work,displacement cascade simulations are conducted using the molecular dynamics method to study the evolution of defects in Ni-based *** with pure Ni,the NiCr,NiCo,and NiCu alloys exhibit a larger number of Frankel pairs(FPs)in the thermal peak stage,but a smaller number of surviving ***,the NiFe alloy displays the opposite *** explain these different observations for NiFe and other alloys,the formation energy and migration energy of interstitials/vacancies are *** the NiFe alloy,both the formation energy and migration energy barrier are *** the other hand,in NiCr and other alloys,the formation energy of interstitials/vacancies is lower,as is the migration energy barrier of *** energy analysis agrees well with previous *** present work provides new insights into the mechanism behind the irradiation resistance of binary Ni-based SP-CSAs.

关键词： Molecular dynamics simulation Displacement cascade Point defect Ni-based concentrated solid solution alloys

A performance evaluation of remotely sensed sea surface salinity products in combination with other surface measurements in reconstructing three-dimensional salinity fields

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Acta Oceanologica Sinica 2017年第7期36卷 15-31页

作者： CHEN Jian YOU xiaobao XIAO Yiguo ZHANG Ren wang Gongjie BAO Senliang Beijing Institute of Applied Meteorology Beijing 100029China Institute of Meteorology and Oceanography PLA University of Science and TechnologyNanjing 211101China

Several remotely sensed sea surface salinity（SSS） retrievals with various resolutions from the soil moisture and ocean salinity（SMOS） and Aquarius/SAC-D missions are applied as inputs for retrieving salinity profiles（S） using multilinear regressions. The performance is evaluated using a total root mean square（RMS） error, different error sources, and the feature resolutions of the retrieved S fields. In the mixed layer of the salinity, the SSS-S regression coefficients are uniformly large. The SSS inputs yield smaller RMS errors in the retrieved S with respect to Argo profiles as their spatial or temporal resolution decreases. The projected SSS errors are dominant, and the retrieved S values are more accurate than those of climatology in the tropics except for the tropical Atlantic, where the regression errors are abnormally large. Below that level, because of the influence of a sea level anomaly, the areas of high-accuracy S values shift to higher latitudes except in the high-latitude southern oceans, where the projected SSS errors are abnormally large. A spectral analysis suggests that the CATDS-0.25° results are much noisier and that the BEC-L4-0.25° results are much smoother than those of the other retrievals. Aquarius-CAP-1° generates the smallest RMS errors, and Aquarius-V2-1° performs well in depicting large-scale phenomena. BEC-L3-0.25°,which has small RMS errors and remarkable mesoscale energy, is the best fit for portraying mesoscale features in the SSS and retrieved S fields. The current priority for retrieving S is to improve the reliability of satellite SSS especially at middle and high latitudes, by developing advanced algorithms, combining both sensors, or weighing between accuracy and resolutions.

关键词： soil moisture and ocean salinity Aquarius sea surface salinity vertical retrieval feature resolution

Relationship between a function of the northward pressure gradient and the Pacific Equatorial Undercurrent

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Acta Oceanologica Sinica 2018年第9期37卷 22-28页

作者： CHEN Xuan ZHENG Chongwei WU Hui YOU xiaobao LI Xunqiang wang Huipeng The 75839 Army People's Liberation Army Guangzhou 510510 China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai 200062 China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics the Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Beijing Institute of Applied Meteorology Beijing 100029 China College of Meteorology and Oceanography National University of Defense Technology Nanjing 211101 China

The Equatorial Undercurrent（EUC） plays an important role in ocean circulation and global climate change. Near the equator, as the Coriolis parameter goes to 0, equatorial currents cannot be described by geostrophy in which the pressure gradient force term is balanced by the Coriolis force term. Many previous studies focus on the relationships between the EUC and El Ni？o-Southern Oscillation（ENSO）, the thermocline, sea surface topography, the distribution of equatorial wind stress and other atmosphere-ocean factors. However, little attention has been paid to the northward pressure gradient（NGT）, which may also be important to the EUC. The pressure can be regarded as a complex nonlinear function of terms including temperature, salinity and *** study attempts to reveal the connection between a function of the northward pressure gradient（FNP） and the EUC. The connection is derived from primitive equations, by simplifying the equations with using scaling analysis, and shows that the beta effect may be the main reason why the FNP is important to the EUC. The vertical structure of the EUC can be partially described by the FNP. The NGT has an obvious influence on the EUC while the eastward pressure gradient has a relatively smaller effect.

关键词： Equatorial Undercurrent northward pressure gradient beta effect

DESIGN OF HIGH VOLTAGE POWER CONVERTER FOR TRAVELING WAVE TUBE AMPLIFIER

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Journal of Electronics(China) 2014年第6期31卷 587-596页

作者： Chen Yu wang Gang Su xiaobao Institute of Electronics Chinese Academy of Sciences

Traveling Wave Tubes(TWTs) are widely used in the radar and communications system as RF power amplifiers. A highly sophisticated power supply is required by TWT. In order to meet the severe requirements of Traveling Wave Tube Amplifier(TWTA), a novel two-stage topology high voltage converter for TWTA is *** converter is based on Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) resonant techniques. The high voltage converter operation principles are investigated and major features of the converter are discussed. The power switching mode of ZVS/ZCS is obtained. The experimental results show that the converter has good soft switching characteristics. Compared to the conventional hard switched Pulse Width Modulation(PWM) techniques, the high efficiency and low ripple of the converter for TWTA are realized. The efficiency of High Voltage Electronic Power Conditioners(HV-EPC) over 93.5% under the condition of 38~46 V input voltage and 260~300 W input power. The switching frequency of first-stage(preregulator) of HV-EPC is 89 k Hz and the switching frequency of second-stage(postregulator) is 44.5 k Hz. The highest output voltage of the HV-EPC is helix voltage which is about –6.8 kV. It is especially suitable for TWTA utilized in space satellite applications due to its high switching frequency and high power density.

关键词： Traveling Wave Tube Amplifier(TWTA) Zero-Voltage Switching and Zero-Current Switching(ZVS/ZCS) High efficiency Two stages

Fabrication and tribological properties of superhydrophobic nickel films with positive and negative biomimetic microtextures

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Friction 2014年第3期2卷 287-294页

作者： Ying wang Jing YANG xiaobao GUO Qiang ZHANG Jingyu wang Jianning DING Ningyi YUAN Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering Changzhou UniversityChangzhou 213164JiangsuChina Jiangsu Key Laboratory for Solar Cell Materials and Technology Changzhou UniversityChangzhou 213164China Center for Low-Dimensional Materials Micro-Nano Devices and SystemsChangzhou UniversityChangzhou 213164JiangsuChina School of Materials Science and Engineering Changzhou UniversityChangzhou 213164China

Nickel(Ni)films with positive and negative textured surfaces of lotus and rice leaf patterns were fabricated through an inexpensive and effective *** as-prepared Ni films were superhydrophobic and exhibited excellent tribological properties after chemical *** results indicated that the water contact angles(WCAs)on the surfaces of biomimetic textured Ni films(approximately 120°)were far greater than those on smooth films(65°).The biomimetic textured surfaces became superhydrophobic(WCA of approximately 150°)after perfluoropolyether(PFPE)treatment,which could be due to the combined effects of the special texture and the *** as-prepared biomimetic-textured Ni films modified with PFPE were improved with a low friction coefficient and excellent antiwear properties,which were due to the combination of the effective lubrication of PFPE and the special textures that served as a good lubricant and a debris ***,the antiwear properties of the as-prepared Ni films with negative biomimetic microtextures modified with PFPE were much better than those of films with positive biomimetic microtextures modified with PFPE.

关键词： nickel positive negative bio-mimicking superhydrophobic friction

Multi-field Coupled Inverse Hall–Petch Relations for Ferroelectric Nanocrystals

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Acta Mechanica Solida Sinica 2024年第1期37卷 139-147页

作者： Xiaodong Zhang Wei Yan Xuhui Lou Yujun Chen Zhihong Zhou Qingyuan wang Lianhua Ma xiaobao Tian Non-Destructive Testing Laboratory School of Quality and Technical SupervisionHebei UniversityBaoding 071002China AVIC Huiyang Aviation Propeller Co. LtdBaoding 071051China Department of Mechanics and Engineering Sichuan UniversityChengdu 610065China Yibin Institute of Industrial Technology Sichuan University Yibin ParkYibin 644000China Research Institute of Interdisciplinary Sciences(RISE) Dongguan University of TechnologyDongguan 523808China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808China

Tailoring grain size can improve the strength of polycrystals by regulating the proportion of grains to grain boundaries and the interaction *** the grain size decreases to the nanoscale,the deformation mechanism in polycrystals shifts from being primarily mediated by dislocations to deformation occurring within the grains and grain ***,the mechanism responsible for fine-grain strengthening in ferroelectric materials remains unclear,primarily due to the complex multi-field coupling effect arising from spontaneous *** molecular dynamics simulations,we investigate the strengthening mechanism of barium titanate(BaTiO3),with extremely fine-grain *** material exhibits an inverse Hall–Petch relationship between grain size and strength,rooting in the inhomogeneous concentration of atomic strain and grain ***,we present a theoretical model to predict the transition from the inverse Hall–Petch stage to the Hall–Petch stage based on strength variations with size,which aligns well with the simulation *** has been found that the piezoelectric properties of the BaTiO3 are affected by polarization domain switching at various grain *** study enhances our understanding of the atomic-scale mechanisms that contribute to the performance evolution of fine-grain nano-ferroelectric *** also provides valuable insights into the design of extremely small-scale ferroelectric components.

关键词： Ferroelectrics Multi-field coupling Molecular dynamics Fine-grain reinforcement Inverse Hall-Petch effect