Wave Attenuation Performance and the Influencing Factors of A Lower Arc-Plate Breakwater

Comprehensive experimental and numerical studies have been undertaken to investigate wave energy dissipation performance and main influencing factors of a lower arc-plate breakwater. The numerical model, which considers nonlinear interactions between waves and the arc-plate breakwater, has been constructed by using the velocity wave- generating method, the volume of fluid (VOF) method and the finite volume method. The results show that the relative width, relative height and relative submergence of the breakwater are three main influencing factors and have significant influence on wave energy dissipation of the lower arc-plate open breakwater. The transmission coefficient is found to decrease with the increasing relative width, and the minimum transmission coefficient is 0.15 when the relative width is 0.45. The reflection coefficient is found to vary slightly with the relative width, and the maximum reflection coefficient is 0.53 when the relative width is 0.45. The transmission and reflection coefficients are shown to increase with the relative wave height for approximately 85% of the experimental tests when the relative width is 0.19 0.45. The transmission coefficients at relative submergences of 0.04, 0.02 and 0 are clearly shown to be greater than those at relative submergences of 0.02 and 0.04, while the reflection coefficient exhibits the opposite relationship. After the wave interacts with the lower arc-plate breakwater, the wave energy is mainly converted into transmission, reflection and dissipation energies. The wave attenuation performance is clearly weakened for waves with greater heights and longer periods.

Influencing Factors and Improvement Suggestions for Agricultural Green Development Performance:Empirical Insights from China

Agricultural green development is an essential direction for global sustainable agriculture.The academic literature,however,needs to place greater emphasis on studying the factors influencing agricultural green development performance and how such performance can be improved.A theoretical framework for agricultural green development performance was constructed in this paper using the Super-SBM model,which considers undesirable outputs,to measure the agricultural green development performance of 330 cities at or above the prefecture level in China(excluding Tibet Autonomous Region,Hong Kong,Macao and Taiwan of China)from 2007 to2018.Furthermore,the influencing mechanism of agricultural green development performance was then analyzed using a spatial econometric model.The results show that:1)from 2007 to 2018,China’s agricultural green development performance experienced three stages of evolution:‘rise,decline and rise’.2)The regions with high performance agricultural green development are mainly distributed in eastern China,northeastern China,and southern Qinghai Province.3)The agricultural economic level,industrialization process,and labor quality play significant roles in promoting local agricultural green development performance,while such performance is obviously inhibited by the openness level and the government’s environmental regulations.Local agricultural green development performance is significant inhibited by the agricultural economic level and accelerated industrialization process in neighboring cities,while significantly promoted by the agricultural industrial structure in neighboring cities.Some suggestions for improving agricultural green development performance are proposed based on these research results,which can provide scientific references for promoting sustainable agriculture.

Review of emulsified asphalt modification mechanisms and performance influencing factors

In recent years,with the improvement of the requirements of road performance,modified emulsified asphalts with better performance has gradually replaced the emulsified asphalt and become the primary material for road maintenance.This paper introduces the modified emulsified asphalt materials commonly used in pavement maintenance projects,definitions and modified mechanisms of polymerized styrene butadiene rubber(SBR)modified emulsified asphalt,styrene butadiene styrene block polymer(SBS)modified emulsified asphalt and waterborne epoxy resin(WER)modified emulsified asphalt are summarized.The analysis focused on comparing the effects of modifiers,preparation process,auxiliary additives,and other factors on the performance of modified emulsified asphalt.In this paper,it is considered that the greatest impact on the performance of emulsified asphalt is the modifier,emulsifier mainly affects the speed of breaking the emulsion,stabilizers on the basic performance of emulsified asphalt evaporative residue is small;and when the modifier is distributed in the asphalt in a network,the dosage at this time is the recommended optimum dosage.Finally,this study recommends that in the future,the polymer-asphalt compatibility can be improved through composite modification,chemical grafting and other methods to continue to develop broader applicability and better performance of modified emulsified asphalt.

Spatial Differentiation and Influencing Factors of Poverty Alleviation Performance Under the Background of Sustainable Development:A Case Study of Contiguous Destitute Areas in Hunan Province,China

Poverty eradication is a realistic requirement for the addressing of the urban-rural development imbalance.It consolidates the achievements of the poverty alleviation,and accelerates the realization of the United Nations Sustainable Development Goals.In research that deals with poverty,qualitative analysis is often used to study the connection between a single influencing factor and poverty reduction,and to solve regional poverty through government measures.However,these studies usually ignore the multidimensional nature of poverty,and the fact that poverty alleviation also needs to be approached from multiple perspectives.By constructing a theoretical framework of poverty alleviation performance from the perspective of sustainable development,this study selects contiguous poverty-stricken areas in the Hunan Province,China as the empirical study area,constructs an evaluation index system from the three dimensions of economic development,infrastructure and people’s livelihood security,and selects influencing factors from three aspects of‘population’,‘land’and‘industry’.The spatial differentiation characteristics and influencing factors of poverty alleviation performance in poverty-stricken areas were studied by using the methods of entropy weight method and geodetector.The results show:firstly,in the concentrated and contiguous poverty-stricken areas of the Hunan Province,the performance of poverty alleviation in the economic development makes little difference,showing a‘high-medium-low’cross-distribution pattern.The poverty alleviation performance of the infrastructure presents a distribution pattern of‘low in the middle and high on both sides.The poverty alleviation performance of people’s livelihood security has significant spatial differentiation characteristics,which all present a reunion distribution.The overall poverty alleviation performance varies greatly,showing a funnel-shaped distribution in space.Secondly,the spatial differentiation of poverty alleviation performance in the concentrated and contiguous poverty-stricken areas of the Hunan Province is the result of the combined effects of multiple factors.‘Population’is the dominant factor affecting the performance of poverty alleviation,‘land’is the basic factor that causes the spatial differentiation of poverty alleviation performance,and‘industry’is the key factor for the improvement of the poverty alleviation ability.

Influential Factors on Deicing Performance of Electrically Conductive Concrete Pavement

The deicing experiment of carbon fiber reinforced electrically conductive concrete （CFRC） slab was conducted in laboratory at first, then the deicing process of CFRC parement was analyzed by means of finite element method （FEM）. At last, based on the energy conservation law and the computing restdts of finite element method, the influential factors including the setting of electric heating layer, environmental temperature, the thickness of ice, material parameters, and deicing power on deicing performance and energy consumption were discussed.

Shear resistance performance of steel-concrete-steel composite shear wall

For a deeper understanding of the shear resistance performance of the steel-concrete-steel composite shear wall, the main influence factors such as the thicknesses of the steel plates and the concrete, the strength grades of the concrete and the span-depth ratios of the composite wall, which have impacts on the shear resistance performance of the composite shear wail, are analyzed by the numerical simulation method. Meanwhile, the simplified calculation formulae of the initial elastic lateral-resisting stiffness and the shear bearing capacity of the composite shear wall are also proposed. The research shows that with the increase in the thicknesses of the steel plates and the concrete and the increase in the strength grades of the concrete, the shear performance of the shear wall improves obviously; the span-depth ratios of the composite wall have a significant effect on the initial elastic lateral- resisting stiffness, but a small effect on the shear bearing capacity. Comparing the results of the simplified calculation formulae with those of the nonlinear finite element method, it is obvious that the presented formulae are reasonable and meet the real force state of the structure. These conclusions can serve as a preliminary design reference for the steel-concrete- steel composite shear wall.

Performance Evaluation of Urban Comprehensive Carrying Capacity of Harbin, Heilongjiang Province in China

Urban comprehensive carrying capacity is an important guarantee and external representation of regional sustainable development. Based on urban comprehensive carrying capacity, this paper constructed a performance evaluation index system of urban comprehensive carrying capacity, and used entropy method, urban comprehensive carrying capacity measurement model and urban sustainable development model to measure spatial and temporal comprehensive carrying capacity of Harbin City in Heilongjiang Province from 2012 to 2017. The results show that: 1) index weight analysis suggested the regional development mode in Harbin still followed an epitaxial development mode, which pursued the expansion of scale and the growth of total amount of regional development, neglecting the effective utilization of resources and the improvement of structural benefits. 2) In the pressure system, the index of resource support has dropped sharply. The index of environmental capacity and social progress has risen circuitously, while the degree of agglomeration and the value of transportation facilities have risen steadily;in the pressure system, the index of population development and economic growth tended to fluctuate, while energy consumption and environmental pollution showed a more synchronous change in characteristics, and the livable demand remained at a high level. 3) The carrying capacity index of resources and environment in Harbin has been declining, and the acquired carrying capacity index fluctuated. The long-term regional development model has severely impaired the carrying capacity of resources and environment. 4) The comprehensive carrying capacity of Harbin has clear spatial differentiation characteristics. Finally, the paper proposes that location conditions, economic development level, government regulation, and science and technology are the main factors influencing the spatial differentiation of urban comprehensive carrying capacity.

Removal performance,mechanisms,and influencing factors of biochar for air pollutants:a critical review

The emission of air pollutants from various industries is a major contributor to environmental pollution.The removal of these pollutants before they are discharged into the environment has become an important means of controlling air pollution.Biochar has attracted increasing attention because of its low cost,high porosity,large specific surface area,abundant surface functional groups,and high removal capacity.The physicochemical properties of biochar are greatly affected by feedstock types,preparation,and modification conditions.For this reason,the capacity and propensity of biochar for removing air pollutants are rather variable.To understand the existing research status and grasp the latest research progress,a systematic review on the removal of different air pollutants by biochar is highly needed.Based on the recent research,this paper systematically analyzes and summarizes the preparation and modification methods of biochar commonly used for the removal of six air pollutants(SO_(2),H_(2)S,CO_(2),Hg0,VOCs,and NH_(3)),as well as the removal performance and mechanisms.Then,the potential influencing factors(preparation parameters,physicochemical characteristics of biochar,and removal conditions)are discussed.Finally,the regeneration of biochar,suggestions,and future perspectives are proposed.

Lateral Performance for Wood-Frame Shear Walls–A Critical Review

Wood is a green material in line with the sustainable development strategy.From the excellent performance of engineering wood products,modern wood structures represented by light wood structures have gained more development opportunities.As an indispensable part of light wood structure systems,the wood-frame shear wall plays a vital role in the bearing capacity and earthquake resistance of light wood structure systems.This paper is focused on a review of the lateral performance of wood-frame shear walls and classifies the influencing factors in relevant experimental research into three categories,including internal factors such as shear wall structure,external factors such as test scheme,and other factors of material production and test process.Finally,the research prospects in this field were introduced based on the summary of the research status.This work can be a reference for further research on the lateral performance of wood-frame shear walls.

Character shaping in animation performance

At present, China＇s animation industry is developing rapidly, the performance of the animation is through a series of design to complete, through the action to create the role of animation characters, which led to the audience resonance. This article mainly analyzes the influencing factors of character creation and the importance of characterization in characterization in the animation performance, and then explores the performance of the characterization in the animation performance. Hoping to through this theoretical study, the animation performance of the characterization of a deeper understanding.

基于PIFA的语音识别系统评测平台

语音识别技术的应用领域众多,而语音识别系统的性能评测对语音识别技术的发展起着重要的推动作用。为了能够更好地对比各类语音系统的性能,在总结现有各种语音识别评测方法的基础上,提出了一种基于性能影响因素分析(PIFA)的语音识别平台体系结构,并据此开发了一个通用的语音识别系统评测平台。该平台以评测库和评测项目为核心概念,包含评测数据生成、数据分析、性能评价指标计算和性能影响因素分析等主要模块,能够面向多种任务和多种语音数据对语音识别系统性能进行快速、准确的自动化评价,尤其适用于大词汇量、连续性的语音识别情景。评测结果可以由平台加以统计分析,揭示各数据属性对识别系统性能的影响,指导语音识别系统的改进和提高。

Evolutionary characteristics and driving factors of carbon emission performance at the city level in China

To achieve carbon peak targets,realize carbon neutrality vision,and tackle global climate change,China must improve the carbon emission performance at the city level.Based on the carbon emission performance of 191 prefecture-level cities in China from 1997 to 2017,this paper analyses the evolution characteristics of urban carbon emission performance from three aspects:the overall spatial and temporal evolution,the differences according to both region and city size,and the differences among clusters categorized by carbon emission performance at the city level.This paper also reveals the impact of the social and economic transition on China’s carbon emission performance.The results show that:(1)The overall level of carbon emission performance of Chinese cities is low,and there is a downward trend during the study period.The differences in carbon emission performance among cities are convergent,but there is a wide gap between high and low values.(2)The carbon emission performance of cities in eastern coastal areas is higher than that in non-coastal areas cities.Large urban agglomerations and economically developed regions,such as provincial capitals,are the agglomeration areas of high urban carbon emission performance values.(3)The carbon emission performance level of cities with similar sizes will converge.At the same time,such changes will enhance the differences among carbon emission performances at the city level within the same region.(4)Cities that belong to high urban carbon emission performance clusters are mainly distributed in the eastern region.Such cities are classified into large cities,supercities,and megacities.Compared with low urban carbon emission performance clusters,cities in high urban carbon emission performance clusters show a higher proportion in the medium-high level and high level of carbon emission performance.Moreover,cities in high urban carbon emission performance clusters are more likely to improve their urban carbon emission performance.(5)The economic agglomeration effect,industrial structure adjustment and carbon intensity reduction have a significant impact on improving urban carbon emission performance.Population agglomeration has an incremental effect,and the anticipated benefits of environmental regulation have yet to be fully realized.The impacts of different clusters and different regions are variable.Finally,this paper advances policy enlightenment according to its research findings.

个人影响因子(PIF):基于综合贡献度和被引质量的作者影响力评价新指标

[目的/意义]提出一个新的作者影响力评价指标——个人影响因子(PIF)。[方法/过程]给出(PIF)的计算公式,以图书情报领域2014-2018年5年内发文量和被引量均为前40名的作者为例,计算其(PIF)值,并与已有指标如h指数、h5指数、作者署名、期刊影响因子等进行对比。[结果/结论]PIF与已有指标存在一定的相关性;相较于其他评价指标,PIF的区分度、灵活性、敏感性和稳定性更高;而且P IF基于被引期刊质量选择合适的时间窗,有利于评价青年作者和“睡美人”文献作者的学术影响力。

脑出血患者血肿扩大的CT征象、参数表现及其相关的影响因素模型构建

目的 探讨脑出血(ICH)患者血肿扩大(HE)的电子计算机断层扫描(CT)征象、参数表现及其相关的影响因素,并构建模型。方法 对于2020年1月~2023年1月在湖北省潜江市中心医院接受治疗的124例ICH患者的临床资料进行回顾性分析,将发生HE的患者纳入HE组(59例),未发生HE的患者纳入无HE组(65例)。比较两组一般资料、CT征象、参数表现,并予以多因素Logistic回归分析法分析ICH患者HE的危险因素,构建预测模型,绘制受试者工作特征(ROC)曲线分析其对ICH患者HE的预测价值。结果 HE组入院时格拉斯哥昏迷量表(GCS)评分低于无HE组;基线血肿量、全血NPR水平均高于无HE组;初诊血肿体积、高低密度差大于无H E组;岛征、漩涡征、黑洞征、混合征及联合征象的患者占比分别为40.68%、44.07%、35.59%、52.54%及83.05%,均高于无HE组的7.69%、7.69%、4.62%、 9.23%及20.00%(P<0.05)。多因素Logistic回归分析结果显示,ICH患者HE的独立危险因素包括全血NPR水平高、初诊血肿体积大、高低密度差大、岛征、漩涡征、黑洞征、混合征及联合征象(OR=1.575、2.406、1.408、1.929、2.713、2.784、2.195、2.633,P<0.05)。构建回归方程模型:logit(P)=-8.983+全血NPR水平×0.454+初诊血肿体积×0.878+高低密度差×0.342+岛征×0.657+漩涡征×0.998+黑洞征X1.024+混合征×0.786+联合征象×0.968。ROC曲线显示,当logit(P)>12.41时,曲线下面积(AUC)值为0.824,95%CI为0.746~0.887,χ^(2)为8.848,诊断敏感度为79.66%,特异度为73.85%。结论 ICH患者HE的独立危险因素包括全血NPR水平高、初诊血肿体积大、高低密度差大、漩涡征、岛征、混合征、黑洞征及联合征象,预测模型对其预测价值较高,临床尽早结合上述情况进行评估,并给予针对性干预措施,有助于预防ICH患者HE的发生风险。

高质量发展背景下卫生系统绩效主观测度及影响因素研究--基于CSS 2015—2021调查的实证分析

高质量发展背景下从主观角度测度卫生系统绩效及其影响因素。利用2015—2021年中国社会状况综合调查数据(Chinese Social Survey,CSS),基于卫生系统绩效评估框架,从居民获得感视角构建卫生系统绩效指数,通过多层回归模型分析我国卫生系统绩效变化趋势及影响因素。我国卫生系统绩效综合指数从2015年的41.732提高到2021年的46.935,增长了12.47%(β=6.143,P<0.01)。其中,过程指数从43.961提高到45.968,增长了4.57%(β=2.391,P<0.01),结果指数从48.501提高到58.009,增长了19.60%(β=11.504,P<0.01)。卫生系统绩效获得感呈现出明显的异质性,性别、年龄、受教育程度、婚姻状况、就业状况、经济状况、医保类型和居住地区类型等因素显著影响居民卫生系统绩效的获得感。高质量发展背景下我国卫生系统绩效明显改善,居民获得感显著提高。然而,卫生系统过程维度改善不够,“看病难、看病贵”问题依然存在。需重点加强脆弱人群以及农村地区卫生系统绩效获得感。

基于等效钢筋连接的连梁和剪力墙节点抗震性能研究

目的 研究基于等效钢筋连接的连梁和剪力墙节点的抗震性能,为装配式混凝土连梁和剪力墙的连接设计提供依据。方法 采用WCOMD有限元软件建立现浇连梁及装配连梁模型,对比分析二者的受力破坏过程。结果 未考虑连梁端部破坏向墙内扩展时,装配连梁与现浇连梁相比,屈服荷载、峰值荷载和极限荷载分别提高3.98%、15.19%和12.76%,延性和能量耗散系数分别提高3.83%和15.84%;未考虑连梁端部破坏向墙内扩展与考虑连梁端部破坏向墙内扩展的装配连梁相比,屈服荷载、峰值荷载和极限荷载分别提高5.97%、0.84%和3.57%,延性和能量耗散系数分别提高1.07%和23.76%。结论 采用等效钢筋连接连梁和剪力墙的方法具有可行性,且等效钢筋面积比、装配区灌浆长度及装配位置对结构的承载力影响较大。

废黏土砖骨料轻质混凝土物理力学性能试验研究

将废弃黏土砖破碎成骨料用于制备轻质混凝土,可同步达到资源再利用、降低环境污染、节省天然骨料的目的。为揭示废弃黏土砖骨料轻质混凝土的性能,通过室内试验对废砖骨料级配、废砖骨料体积率、水灰比、泡沫掺量等因素影响轻质混凝土的干密度、吸水率、抗压强度性能进行试验研究,结果表明:泡沫掺量对干密度和抗压强度影响显著,泡沫掺量由2%增加到5%时,干密度由1407kg/m^(3)减小到1128kg/m^(3),抗压强度由13.39MPa减小到4.66MPa,废砖骨料级配对吸水率影响显著,骨料级配从A组到C组级配时,吸水率由11.3%减小到5.7%。

甘氨酸与热力学抑制剂对甲烷水合物的协同抑制机理

天然气水合物在开采过程中,温度和压力的变化会导致分解后的水合物二次形成,进而会造成井筒和管线堵塞。甘氨酸因其强亲水性和生物可降解性,在水合物防治方面具有巨大应用潜力,但其与热力学抑制剂复配协同抑制水合物生成的作用机理尚不明确。为此,开展了甘氨酸与常见盐类和醇类热力学抑制剂复配使用时的甲烷水合物生成模拟实验,分析了甘氨酸与热力学抑制剂协同抑制甲烷水合物生成机理,并形成了适用于海洋水合物钻探开发用的甘氨酸类钻井液体系。研究结果表明:①甲烷气消耗量并不能真实反映抑制剂对水合物生成的抑制效果,还需结合水合物最终生成量、水合物生成3个阶段的时间变化情况综合判断;②甘氨酸浓度为1.0%时,抑制水合物生成的效果最佳,对应的反应体系具有最小的水合物生成区和最大的稳定区;③相比于单独使用1.0%甘氨酸,5.0%盐类抑制剂与1.0%甘氨酸混合使用时,具有协同抑制水合物生成的效果,可减少水合物生成量20%~30%,但5.0%醇类抑制剂与1.0%以及0.5%甘氨酸混合使用时反而促进了水合物生成;④甘氨酸与盐类混合形成的钻井液体系,可以有效降低水合物生成量。结论认为,该认识进一步厘清了甘氨酸与热力学抑制剂对水合物的协同抑制机理,为解决水合物开采过程中井筒堵塞造成的钻井安全问题提供了实验数据和理论支撑。

带短肋钢筋桁架预制底板受弯性能研究

为研究带短肋钢筋桁架预制底板的力学性能,采用ABAQUS建立有限元模型,对比了该板与钢筋桁架预制底板的受弯性能,探讨了短肋形式对该板受弯性能的影响,分析了短肋长度、宽度、数量等因素对该板受弯性能的影响。结果表明:与钢筋桁架预制底板相比,带短肋钢筋桁架预制底板的承载力和刚度更高,带短肋钢筋桁架预制底板具有可行性;矩形短肋可有效提高该板的承载力和刚度;短肋长度、宽度对该板受弯性能影响较大,最大相差21.73%,且短肋长度主要影响承载力,宽度主要影响刚度;短肋混凝土强度等级、厚度,数量对该板受弯性能影响较小,最大相差3.5%。

宁夏地区1452名护士工作幸福感现状及影响因素分析:一项多中心研究

目的:调查宁夏地区护士工作幸福感的现状及影响因素,为制定减轻护士绩效压力、提高工作幸福感的干预措施提供参考。方法:采用便利抽样法选取2023年1月—3月宁夏回族自治区5个市区的5所三级医院1 452名护士作为调查对象,采用自行设计的一般资料调查表、绩效压力量表、护士心理资本问卷和护士工作幸福感量表对其进行问卷调查,并对调查结果进行统计分析。结果:护士工作幸福感总分为(85.06±18.81)分,多元逐步回归分析结果显示,韧性、乐观、自我效能、竞争压力、医院所在地、就职医院等级、是否喜欢护理专业均是护士工作幸福感的影响因素(P<0.05)。结论:宁夏地区护士工作幸福感处于中等水平,心理资本维度中的韧性、乐观、自我效能及绩效压力维度中的竞争压力、就职医院所在地、就职医院等级、是否喜欢护理专业均是护士工作幸福感的预测因素。护理管理者应重视护士的工作幸福感,根据影响因素制定针对性措施,提高护士工作幸福感。