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工业区绿色生态城市更新单元规划设计理念与应用研究

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工程技术研究 2024年第14期9卷 188-190页

作者：夏冰心深圳和华国际工程与设计有限公司广东深圳518000

文章通过深入分析深圳市工业用地转型背景,以及绿色生态城市更新单元的定义、特征、重要性等方面,结合案例分析,总结了工业区绿色生态城市更新单元规划设计理念、方法与技术,进行了案例分析。研究结果表明,科学的规划设计能促进工业结... 详细信息

文章通过深入分析深圳市工业用地转型背景,以及绿色生态城市更新单元的定义、特征、重要性等方面,结合案例分析,总结了工业区绿色生态城市更新单元规划设计理念、方法与技术,进行了案例分析。研究结果表明,科学的规划设计能促进工业结构转型升级,提升城市环境品质,提高资源利用效率,促进城市可持续发展,为工业区的发展注入新动力。

关键词：工业区绿色生态城市更新单元规划

rb-bFGF联合美容缝合技术在儿童颌面部软组织创伤愈合中的应用

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中国美容医学 2024年第9期33卷 62-65页

作者：夏冰心张少翔徐海波芜湖市第一人民医院整形科安徽芜湖241000

目的:探究重组牛碱性成纤维细胞生长因子(Recombinant bovine basic fibroblast growth factor,rb-bFGF)联合美容缝合技术在颌面部软组织创伤愈合的应用。方法:纳入笔者医院整形外科于2023年4月-2023年5月期间收治的72例开放性面部损伤... 详细信息

目的:探究重组牛碱性成纤维细胞生长因子(Recombinant bovine basic fibroblast growth factor,rb-bFGF)联合美容缝合技术在颌面部软组织创伤愈合的应用。方法:纳入笔者医院整形外科于2023年4月-2023年5月期间收治的72例开放性面部损伤患儿,按照随机数字表法将所有研究对象分为缝合组(n=36)与rb-bFGF组(n=36),缝合组实施美容缝合术,rb-bFGF组在缝合组基础上施加rb-bFGF凝胶治疗,2次/天,持续7 d。比较两组患儿创面愈合情况(愈合时间、表皮生长时间)、并发症发生率,术后7 d,细胞因子水平[干扰素(Interferon-α,INF-α)、人干扰素诱导蛋白10(Interferon induced protein-10,IP-10)及转化生长因子β1(Transforming growth factorβ1,TGF-β1)],术前及术后5个月瘢痕评分[瘢痕评估量表(Patient and observer scar assessment scale,POSAS)、温哥华瘢痕评估量表(Vancouver Scar scale,VSS)]及美学效果满意度。结果:rb-bFGF组患儿创面愈合时间、表皮生长时间均显著短于缝合组(P0.05);术后7 d,rb-bFGF组INF-α、IP-10水平显著低于缝合组,TGF-β1水平显著高于缝合组(P<0.05);术后5个月,rb-bFGF组POSAS、VSS评分均显著低于缝合组(P<0.05);rb-bFGF组患儿美学效果满意度(94.44%)显著高于缝合组(77.78%)(P<0.05)。结论:rb-bFGF联合美容缝合技术可加快颌面部软组织损伤患儿伤口愈合,改善瘢痕及美观度,并发症较少,安全有效,值得推广。

关键词：重组牛碱性成纤维细胞生长因子美容缝合技术颌面部软组织创伤瘢痕美学效果

Predicting Credit Card Transaction Fraud Using Machine Learning Algorithms

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Journal of Intelligent Learning Systems and Applications 2019年第3期11卷 33-63页

作者： Jiaxin Gao Zirui Zhou Jiangshan Ai bingxin xia Stephen Coggeshall Hebei University of Economics and Business Shijiazhuang China China University of Political Science and Law Beijing China Wuhan Maple Leaf International School (High School) Wuhan China Wuhan Jinde Education Consulting Co. Ltd. Wuhan China University of Southern California Los Angeles USA

Credit card fraud is a wide-ranging issue for financial institutions, involving theft and fraud committed using a payment card. In this paper, we explore the application of linear and nonlinear statistical modeling and machine learning models on real credit card transaction data. The models built are supervised fraud models that attempt to identify which transactions are most likely fraudulent. We discuss the processes of data exploration, data cleaning, variable creation, feature selection, model algorithms, and results. Five different supervised models are explored and compared including logistic regression, neural networks, random forest, boosted tree and support vector machines. The boosted tree model shows the best fraud detection result (FDR = 49.83%) for this particular data set. The resulting model can be utilized in a credit card fraud detection system. A similar model development process can be performed in related business domains such as insurance and telecommunications, to avoid or detect fraudulent activity.

关键词： Credit Card Fraud Machine Learning Algorithms Logistic Regression Neural Networks Random Forest Boosted Tree Support Vector Machines

Particle-bound polycyclic aromatic hydrocarbons in typical urban of Yunnan-Guizhou Plateau:Characterization,sources and risk assessment

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Frontiers of Environmental Science & Engineering 2022年第9期16卷 25-38页

作者： Yaoqian Zhong bingxin xia Jianwu Shi Ping Ning Chaoneng Zhang Xinyu Han Jiming Hao Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China State Key Joint Laboratory of Environmental Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

Monthly particle-phase ambient samples collected at six sampling locations in Yuxi,a high-altitude city on the edge of Southeast Asia,were measured for particle-associated *** trace substances,polycyclic aromatic hydrocarbons(PAHs)are susceptible to the influences of meteorological conditions,emissions,and gas-particulate partitioning and it is challenging job to precise quantify the source and define the transmission *** daily concentrations of total PM_(2.5)-bound PAHs ranged from 0.65 to 80.76 ng/m^(3),with an annual mean of 11.94 ng/m^(3).Here,we found that the concentration of PM_(2.5)-bound PAHs in winter was significantly higher than that in summer,which was mainly due to source and meteorology *** increase of fossil combustion and biomass burning in cold season became the main contributors of PAHs,while precipitation and low temperature exacerbated this *** to the concentration variation trend of PM_(2.5)-bound PAHs and their relationship with meteorological conditions,a new grouping of PAHs is applied,which suggested that PAHs have different environmental fates and migration paths.A combination of source analysis and trajectory model supported local sources from combustion of fossil fuel and vehicle exhaust contributed to the major portion on PAHs in particle,but on the Indochina Peninsula the large number of pollutants emitted by biomass burning during the fire season would affect the composition of PAHs through long-range *** assessment in spatial and temporal variability suggested that citizens living in industrial areas were higher health risk caused by exposure the PM_(2.5)-bound PAHs than that in other regions,and the risk in winter was three times than in summer.

关键词： Particle-associated PAHs Fine particle Source appointment Group analysis Risk assessment Biomass burning

Laurencia nanhaiense ***.,a new species of the genus Laurencia(Rhodomelaceae,Rhodophyta) from China

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Acta Oceanologica Sinica 2007年第5期26卷 136-143页

作者： TSENG C K Institute of Oceanology Chinese Academy of Sciences

Laurencia nanhaiense sp. nov. （Rhodomelaceae, Rhodophyta） is described from Hainan and Guangdong Provinces, China. The new species clearly displays one of the defining features of the genus, viz. four periaxial cells per vegetative axial segment. It differs from other closely related species in having a combination of features such as terete axes from a basal system composed of a primary discoid holdfast and a secondary attachment to give rise to many short rhizoids, branching oppositely and alternately, irregularly tristichous or subverticillately polystichous, having more curve branches with very sparse, adventitious ultimate branchlets, non-projecting superficial cortical cells at the apices of ultimate branchlets, presence of longitudinally oriented secondary pit-connections between contiguous superficial cortical cells, absence of lenticular thickenings in the walls of medullary cells, parallel arrangement of tetrasporangia along the axis of stichidia, and presence of intercellular spaces between medullary cells.

关键词： Rhodomelaceae Laurencia nanhaiense Rhodophyta taxonomy China.

Analytical Solutions for an Isotropic Elastic Half-Plane with Complete Surface Effects Subjected to a Concentrated/Uniform Surface Load

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Acta Mechanica Solida Sinica 2024年第3期37卷 371-384页

作者： xia-Hui Pan School of Civil Engineering Henan Polytechnic UniversityJiaozuo454003China

Within the context of Gurtin-Murdoch surface elasticity theory,closed-form analytical solutions are derived for an isotropic elastic half-plane subjected to a concentrated/uniform surface *** the effects of residual surface stress and surface elasticity are *** stress function method and Fourier integral transform technique are *** solutions are provided in a compact manner that can easily reduce to special situations that take into account either one surface effect or none at *** results indicate that surface effects generally lower the stress levels and smooth the deformation profiles in the *** elasticity plays a dominant role in the in-plane elastic fields for a tangentially loaded half-plane,while the effect of residual surface stress is fundamentally crucial for the out-of-plane stress and displacement when the half-plane is normally *** the remaining situations,combined effects of surface elasticity and residual surface stress should be *** results for a concentrated surface force serve essentially as fundamental solutions of the Flamant and the half-plane Cerruti problems with surface *** solutions presented in this work may be helpful for understanding the contact behaviors between solids at the nanoscale.

关键词： Surface effects Residual surface stress Surface elasticity Half-plane Analytical solutions

Computational modelling of gas–liquid–solid multiphase free surface flow with and without evaporation

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Particuology 2024年第7期90卷 218-235页

作者： Huihuang xia Marc Kamlah Institute for Applied Materials(IAM) Karlsruhe Institute of Technology(KIT)Hermann-von Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany

Gas–liquid–solid multiphase systems are ubiquitous in engineering applications,*** printing,spray drying and *** a numerical framework for modelling these multiphase systems is of great *** improved,resolved computational fluid dynamics-discrete element method(CFD-DEM)framework is developed to model the multiphase free surface flow with and without *** improved capillary force model is developed to compute the capillary interactions for partially floating particles at a free *** well-known benchmark cases,namely drag coefficient calculation,the single sphere settling,and drafting-kissing-tumbling of two particles are conducted to validate the resolved CFD-DEM *** turns out that the resolved CFD-DEM model developed in this paper can accurately calculate the fluid–solid interactions and predict the trajectory of solid particles interacting with the liquid *** demonstrations,namely two particles moving along a free surface when the liquid phase evaporates,and particle transport and accumulations inside an evaporating sessile droplet show the performance of the resolved model.

关键词： Capillary force Discrete element method Liquid bridge Particle transport Resolved CFD-DEM Volume of fluid

Seasonal thermal energy storage using natural structures:GIS-based potential assessment for northern China

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Building Simulation 2024年第4期17卷 561-574页

作者： Yichi Zhang Jianjun xia Midea HVAC Heating&Ventilation Equipment Co. LtdFoshan528311China Building Energy Research Center Tsinghua UniversityBeijing100084China

Seasonal thermal energy storage(STES)allows storing heat for long-term and thus promotes the shifting of waste heat resources from summer to winter to decarbonize the district heating(DH)*** being a promising solution for sustainable energy system,large-scale STES for urban regions is lacking due to the relatively high initial investment and extensive land *** close the gap,this study assesses the potentials of using two naturally available structures for STES,namely valley and ground pit *** on geographical information system(GIS)methods,the available locations are searched from digital elevation model and selected considering several criteria from land uses and construction *** costs of dams to impound the reservoir and the yielded storage capacities are then quantified to guide the choice of suitable *** assessment is conducted for the northern China where DH systems and significant seasonal differences of energy demand *** total,2,273 valley sites and 75 ground pit sites are finally identified with the energy storage capacity of 15.2 billion GJ,which is much larger than the existing DH demand in northern *** results also prove that 682 valley sites can be achieved with a dam cost lower than 20 CNY/m^(3).By conducting sensitivity analysis on the design dam wall height and elevations,the choices of available natural structures are expanded but practical issues about water pressures and constructions are also ***,the identified sites are geographically mapped with nearest urban regions to reveal their roles in the DH *** general,560 urban regions are found with potential STES units and most of them have STES storage capacities larger than their own DH *** novel planning methodology of this study and publicly available datasets create possibilities for the implementations of large-scale STES in urban DH systems.

关键词： seasonal thermal energy storage geographical information system district heating water reservoir

Minimum mass-entransy dissipation profile for one-way isothermal diffusive mass-transfer process with mass-resistance and massleakage

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Science China(Technological Sciences) 2024年第8期67卷 2427-2435页

作者： CHEN LinGen xia ShaoJun Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China School of Mechanical Electrical EngineeringWuhan Institute of TechnologyWuhan 430205China School of Power Engineering Naval University of EngineeringWuhan 430033China

As a new concept,mass-entransy is one of the twins in the core of entransy *** can describe mass-transfer ability for masstransfer processes(MTPes),just as thermal-entransy for describing heat-transfer ***,mass-entransy dissipation can be utilized to evaluate the loss of mass-transfer *** mass-entransy dissipation(MMED) is utilized to optimize one-way isothermal diffusive MTPes with mass-leakage and mass-transfer law(g ∝ Δ(c),where c means concentration).For a given net amount of mass-transferred key components at the low-concentration side,optimality-condition for the MMED of isothermal diffusive MTPes is obtained by using the *** of the amount of mass-transferred and mass-leakage on optimal results are analyzed,and the obtained optimization profiles are compared with those for MTP profiles of constant-concentration-difference(c_1-c_2=const) and constant-concentration-ratio(c_1/c_2=const).The product of square of key-component-concentration(KCC) difference between high-and low-concentration sides and inert component concentration at high-concentration side for the MMED of the MTP with no mass-leakage is a constant,and the optimal relationship of the KCCs between high-and low-concentration sides with mass-leakage is significantly different from the *** mass-leakage is relatively small,the MTP with c_1-c_2=const strategy is superior to that with c_1/c_2=const strategy,and the latter is superior to the former with an increase in mass-leakage.A combination of mass-entransy concept,finite-time thermodynamics,and averaged-optimization-method is a meaningful tool for optimizing MTPes.

关键词： diffusive mass-transfer-law mass-leakage one-way isothermal mass-transfer minimum mass-entransy dissipation finite-time thermodynamics averaged-optimization-method