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A comprehensive analysis method of building luminous and indoor thermal environment based on orthogonal analysis 基于正交分析的建筑光环境与室内热环境综合分析方法
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-15 DOI: 10.3233/jcm-226881
N. Ding, Jie Yuan
Good design strategies can help reduce energy consumption and ensure proper natural lighting. In the process of building design, this paper uses orthogonal analysis to identify design elements that correspond optimally to light levels. The visible light transmission ratio, horizontal sunshade baffle depth, sunshade angle, horizontal sunshade height from the window, and heat transfer coefficient were selected as influencing factors. The design elements corresponding to the lowest energy consumption were found. The test points are representative, and the number of tests is small.
良好的设计策略可以帮助减少能源消耗,并确保适当的自然采光。在建筑设计的过程中,本文采用正交分析法来确定与光照水平最匹配的设计元素。选取可见光透过率、水平遮阳挡板深度、遮阳角度、水平遮阳距窗高度、换热系数作为影响因素。找到了能耗最低的设计要素。测试点具有代表性,测试数量较少。
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引用次数: 0
The application of UAVs in marathon public security risk early warning 无人机在马拉松公共安全风险预警中的应用
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-15 DOI: 10.3233/jcm-226891
J. Zhang, Yukun Lu, Sen Lin
The UAV (Unmanned Aerial Vehicle) has the advantages of mobility and flexibility, rapid concealment and holistic vision. Coordinating with the intelligent and efficient precise dispatching of the “decision module” of the command centre, UAVs can meet the public safety needs of significant events. The marathon is an open, long-distance, gathering sporting event, so on-site security is hard to guarantee. To study the application of UAVs in marathon public security risk early warning, we examine the Hangzhou Marathon as an example, analysing the potential public security risks of a marathon and the application scenarios of UAVs by modelling the data of population and vehicles near the fundamental security early warning places of the marathon through theoretical discussion and modelling research. We propose a marathon risklevel intelligent identification and early warning model, establish the deployment and control scheme of UAVs in marathon public security, and conceive a comprehensive command platform for UAVs to promote the integration of UAVs into marathon security by taking intelligent security as an example.
无人机(UAV)具有机动性和灵活性、快速隐蔽和整体视野等优点。配合指挥中心“决策模块”的智能高效精准调度,满足重大事件公共安全需求。马拉松是一项开放、长距离、聚集的体育赛事,因此现场安全很难保证。为研究无人机在马拉松公共安全风险预警中的应用,以杭州马拉松为例,通过理论讨论和建模研究,对马拉松基本安全预警地点附近的人口和车辆数据进行建模,分析马拉松潜在的公共安全风险以及无人机的应用场景。提出马拉松风险级智能识别预警模型,建立无人机在马拉松公共安全中的部署与控制方案,构想无人机综合指挥平台,以智能安防为例,推动无人机融入马拉松安防。
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引用次数: 0
Optimization of segmented thermoelectric power generators from waste heat while considering the influence of temperature on materials 考虑温度对材料影响的分段式余热热电发电机的优化设计
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-15 DOI: 10.3233/jcm-226874
W. Cao, Baolin Wang, Jianzhuang Xu, Jie Lei, Meiying Huang, Ruifang Zhang, C. Bluth
Thermoelectric technology is commonly used in waste heat utilization of automotive internal combustion engines and widely combined with solar energy units to form solar thermoelectric generator systems. The structure of the Thermoelectric Generator (TEG) needs to be optimized in order to obtain better performance for wider applications. In this paper, the influence of temperature on the height of PN-type thermoelectric arms was analyzed using an improved one-dimensional heat conduction model with the calculus method. At the same time, both the calculation formula of the maximum output power and the calculation formula of various size parameters of the TEG was derived when the influence of temperature on the performance of thermoelectric materials has been considered. In addition, the relationships among different size parameters were derived to obtain the maximum efficiency. The relationships include the most commonly used classical optimization relationship, that is, when the Seebeck coefficient, thermal conductivity and resistivity are averaged, the relationship is consistent with the classical optimization relationship. By considering the impact of temperature on the performance of thermoelectric materials, an improved calculation formula of the figure of merit (Z) was also given. The new optimization formula was compared with the classical optimization method by taking the maximum output power as the optimization index. In the case study, the temperatures of the cold end and the hot end were set at 330 K and 700 K, respectively. PbTe and PbSe were used as the materials with intermediate temperature, and Bi2Te3 was used as the material with low temperature. Through theoretical analysis, it is found that the maximum output power of the new optimization formula can be higher than that of the classical optimization formula.
热电技术通常用于汽车内燃机的废热利用,并与太阳能单元广泛结合,形成太阳能热电发电系统。热电发电机(TEG)的结构需要优化,以获得更好的性能,用于更广泛的应用。本文采用改进的一维热传导模型,用微积分方法分析了温度对PN型热电臂高度的影响。同时,在考虑温度对热电材料性能影响的情况下,导出了TEG最大输出功率的计算公式和各种尺寸参数的计算公式。此外,推导了不同尺寸参数之间的关系,以获得最大效率。这些关系包括最常用的经典优化关系,即当对塞贝克系数、热导率和电阻率进行平均时,该关系与经典优化关系一致。考虑到温度对热电材料性能的影响,给出了一个改进的优值(Z)计算公式。以最大输出功率为优化指标,将新的优化公式与经典的优化方法进行了比较。在案例研究中,冷端和热端的温度分别设定为330K和700K。使用PbTe和PbSe作为具有中间温度的材料,使用Bi2Te3作为具有低温的材料。通过理论分析发现,新优化公式的最大输出功率可以高于经典优化公式。
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引用次数: 0
Analysis of factors affecting the water regeneration capacity in Tarim River Basin 塔里木河流域水资源再生能力影响因素分析
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-15 DOI: 10.3233/jcm-226878
Juan Wu, Y. Li
The formation, evolution and regeneration of water resources follow the general laws of nature. However, in recent years, with the increasing social and economic activities of human beings, the hydrological cycle of nature has undergone significant changes, which has led to a prominent contradiction in the water supply-demand. It has also led to a series of serious environmental and ecological problems, which have caused certain areas, such as the Tarim River Basin (TRB) to face severe conditions of water shortage, downstream river channel cutoff, vegetation degradation and ecological environment deterioration. The lack of water is the main problem to solve these problems, and the water resource reproducible ability, now and in the future, is the key to solving the core problem of water shortage. Through collecting data of precipitation, runoff and temperature of representative hydrographic stations of the Tarim River, as well as the data of geographical location and human activities, this paper studies the factors affecting the water resource reproducible ability in the TRB. The paper draws the following conclusions: (1) The water resource reproducible ability in the source flow area of TRB is increasingwhen the temperature and precipitation is increasing. (2) The water resource reproducible ability in the west of TRB is greater than that in the east. (3) With the elevation of the topography, the water resource reproducible ability in the TRB is stronger. (4) Human activities weaken the water resource reproducible ability.
水资源的形成、演化和再生遵循着自然界的一般规律。然而,近年来,随着人类社会经济活动的日益频繁,自然界的水循环发生了重大变化,导致了水资源供需矛盾的突出。这也导致了一系列严重的环境和生态问题,使塔里木河流域等部分地区面临着水资源短缺、下游河道断流、植被退化和生态环境恶化的严峻局面。水资源短缺是解决这些问题的主要问题,而水资源的可再生能力,无论是现在还是未来,都是解决水资源短缺这一核心问题的关键。本文通过收集塔里木河代表性水文站的降水、径流和温度资料,以及地理位置和人类活动资料,对塔里木河流域水资源可再生能力的影响因素进行了研究。本文得出以下结论:(1)随着温度和降水的增加,TRB源流区水资源再生能力逐渐增强。(2) TRB西部的水资源可再生能力大于东部。(3)随着地形的升高,TRB内水资源的再生能力越强。(4)人类活动削弱了水资源的再生产能力。
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引用次数: 0
Optimization and comparison of two-stage thermoelectric generators considering the influence of temperature variation on materials for waste heat utilization 考虑温度变化对余热利用材料影响的两级热电发电机优化与比较
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-15 DOI: 10.3233/jcm-226876
W. Cao, Jie Lei, Jianzhuang Xu, Baolin Wang, Meiying Huang, Ruifang Zhang, C. Bluth
Thermoelectricity technology, as a kind of cost-effective and pollution-free power generation solution, is often used for waste heat recovery and utilization. In this paper, the temperature distribution of a Two-stage Thermoelectric Generator (TTEG) under constant temperature conditions has been studied using a one-dimensional heat conduction model. Moreover, by combining the obtained temperature distribution with the three-dimensional size of TTEG, a calculation formula of resistance and voltage was developed based on the calculus method. When the sum of cross-sectional areas of all the PN-type thermoelectric arms respectively in high- and low-temperature layers is constant, the optimal ratio between cross-sectional areas of a single PN-thermoelectric arm respectively in high- and low-temperature layers can be calculated using the proposed formula in this study to achieve the maximum output power. Results also showed the relationship between the heights of PN-type thermoelectric arms and the temperature distributions in high- and low-temperature layers. Using PbTe as the medium temperature thermoelectric material and Bi2Te3 as the low temperature thermoelectric material, a case study was conducted on the PN-type thermoelectrics with the same total height and the same total cross-sectional area. The theoretical calculation results showed that the bigger of maximum output power between the two-stage thermoelectric generator and that of the Segmented Thermoelectric Generator (STEG) is related to the hot and cold end temperature.
热电技术作为一种低成本、无污染的发电解决方案,常被用于余热的回收利用。本文采用一维热传导模型,研究了恒温条件下两级热电发生器(TTEG)的温度分布。将得到的温度分布与TTEG的三维尺寸相结合,建立了基于微积分法的电阻和电压计算公式。当高温层和低温层中所有pn型热电臂的截面积总和一定时,利用本文提出的公式可以计算出高温层和低温层中单个pn型热电臂的最优截面积比,从而获得最大输出功率。结果还显示了pn型热电臂的高度与高低温层温度分布之间的关系。以PbTe为中温热电材料,Bi2Te3为低温热电材料,对具有相同总高度和相同总截面积的pn型热电材料进行了实例研究。理论计算结果表明,两级热电发电机与分段式热电发电机(STEG)的最大输出功率的大小与冷热端温度有关。
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引用次数: 0
Application of BIM+IoT technology in the design and operation and maintenance stages of smart buildings BIM+IoT技术在智能建筑设计和运维阶段的应用
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-13 DOI: 10.3233/jcm-226910
Yuzhao Liu, Shaojun Hong, Fan Jiang
With the continuous emergence of new technologies and the efficient and convenient development of people’s daily life and work, the topic of intelligent building is becoming more and more hot. There are two kinds of data in intelligent building, namely static data and dynamic data. The digital expression of intelligent building is realized through the fusion and interaction of these two kinds of data. The building information model (BIM) stores a large amount of static data, including size, material, color and other data, while the Internet of Things (IoT) collects real-time dynamic data, including temperature, humidity, light and other data, through sensors in every space within the building. The related problems of building data management in the design and operation and maintenance stages mainly include data collection relying on manual work, low data processing efficiency, scattered and disorderly data storage, difficult data interaction, slow speed, and low data visualization. In order to solve these problems, this paper combines the characteristics and advantages of BIM and IoT technology, analyzes the interaction and application value of BIM and IoT technology in the design and operation and maintenance stage of intelligent buildings, and constructs a data management system based on the Internet of things, a 3D visualization technology based on BIM, and an operation and maintenance management platform based on BIM and IoT. The application of BIM and IoT technology in the design and operation and maintenance stage of intelligent buildings has promoted the development of the construction industry. The Internet of Things can provide many functional services, such as real-time monitoring, remote tracking, automatic update, plan management and a series of personalized services and management, to achieve the management, control and detection of various things, and ensure the high-speed and effective operation of the system. The emergence of the building system of modern communication network technology has brought many conveniences to people, and there is still a broad space for development. The combination of new Internet of Things technology and intelligent buildings will certainly be an important development direction.
随着新技术的不断涌现,人们日常生活和工作的高效便捷发展,智能建筑的话题越来越热门。智能建筑中有两种数据,即静态数据和动态数据。通过这两种数据的融合与交互,实现了智能建筑的数字化表达。建筑信息模型(BIM)存储了大量静态数据,包括尺寸、材料、颜色等数据,而物联网(IoT)则通过建筑内每个空间的传感器收集实时动态数据,包括温度、湿度、光线等数据。建筑数据管理在设计和运维阶段的相关问题主要包括数据采集依赖人工、数据处理效率低、数据存储分散无序、数据交互困难、速度慢、数据可视化程度低。为了解决这些问题,本文结合BIM和物联网技术的特点和优势,分析了BIM和物联技术在智能建筑设计和运维阶段的相互作用和应用价值,构建了一个基于物联网的数据管理系统,一个基于BIM的三维可视化技术,以及基于BIM和物联网的运维管理平台。BIM和物联网技术在智能建筑设计和运维阶段的应用促进了建筑业的发展。物联网可以提供实时监控、远程跟踪、自动更新、计划管理等一系列个性化服务和管理等多种功能服务,实现对各种事物的管理、控制和检测,确保系统的高速有效运行。现代通信网络技术建筑体系的出现,给人们带来了诸多便利,仍有广阔的发展空间。新的物联网技术与智能建筑的结合必将是一个重要的发展方向。
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引用次数: 0
An improved predictor for identifying recombination spots based on support vector machine 基于支持向量机的重组点识别改进预测器
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-12 DOI: 10.3233/jcm-226872
Linghua Kong, Xueda Zhao
Meiotic recombination has a crucial role in the biological process involving double-strand DNA breaks. Recombination hotspots are regions with a size varying from 1 to 2 kb, which is closely related to the double-strand breaks. With the increasement of both sperm data and population data, it has been demonstrated that computational methods can help us to identify the recombination spots with the advantages of time-saving and cost-saving compared to experimental verification approaches. To obtain better identification performance and investigate the potential role of various DNA sequence-derived features in building computational models, we designed a computational model by extracting features including the position-specific trinucleotide propensity (PSTNP) information, the electron-ion interaction potential (EIIP) values, nucleotide composition (NC) and dinucleotide composition (DNC). Finally, the supporting vector machine (SVM) model was trained by using the 172-dimensional features selected by means of the F-score feature ranking mode, and the accuracy of the predictor reached 98.24% in the jackknife test, which elucidates this model is a potential way for identifying recombination spots.
减数分裂重组在双链DNA断裂的生物学过程中起着至关重要的作用。重组热点是大小在1 ~ 2kb之间的区域,与双链断裂密切相关。随着精子数据和种群数据的增加,与实验验证方法相比,计算方法可以帮助我们识别重组点,具有节省时间和成本的优点。为了获得更好的识别性能,并研究各种DNA序列衍生特征在构建计算模型中的潜在作用,我们设计了一个计算模型,该模型提取了包括位置特异性三核苷酸倾向(PSTNP)信息、电子-离子相互作用势(EIIP)值、核苷酸组成(NC)和二核苷酸组成(DNC)在内的特征。最后,利用F-score特征排序模式选择的172维特征对支持向量机(SVM)模型进行训练,在刀切试验中预测准确率达到98.24%,说明该模型是一种潜在的识别重组点的方法。
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引用次数: 0
Noise-driven signal study of power systems based on stochastic partial differential equations 基于随机偏微分方程的电力系统噪声驱动信号研究
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-10 DOI: 10.3233/jcm-226914
Yankee Chen
The exploration of stochastic partial differential equations in noisy perturbations of dynamical systems remains a major challenge at this stage. The study analyzes the effective dynamical system combining degenerate additive noise-driven stochastic partial differential equations, firstly in the first class of stochastic partial differential equations, the terms in the non-nuclear space formed by nonlinear interactions are overcome by effectively replacing the elements in the non-nuclear space through the ItÔ formulation, and thus the final effective dynamical system is obtained. The effective dynamical system is then obtained in the second type of stochastic partial differential equation using the O-U process similar to the terms in the non-nuclear space. At noise disturbance amplitudes of 5%, 10%, 15% and 20% AC voltage maxima in that order, the effective dynamical systems for the first type of stochastic partial differential equation and the second type of stochastic partial differential equation are more stable compared to the other types of partial differential equation dynamical systems, with the maximum range of error rate improvement for the sampling points 0–239 voltage rms and voltage initial phase value being 3.62% and 26.85% and 2.13% and 19.86% for sampling points 240–360, respectively. The effective dynamic system and stochastic partial differential equation obtained by the research have very high approximation effect, and can be applied to mechanical devices such as thermal power machines.
在这个阶段,探索动力系统的噪声扰动中的随机偏微分方程仍然是一个主要的挑战。结合退化加性噪声驱动的随机偏微分方程分析有效动力系统,首先在第一类随机偏微分方程中,通过ItÔ公式有效替换非核空间中的元素,克服非线性相互作用形成的非核空间中的项,从而得到最终的有效动力系统。然后利用类似于非核空间项的O-U过程,得到了第二类随机偏微分方程的有效动力系统。在5%、10%、15%和20%交流电压的最大噪声扰动幅度下,第一类随机偏微分方程和第二类随机偏微分方程的有效动力系统比其他类型的偏微分方程动力系统更稳定。采样点0 ~ 239电压RMS和电压初始相位值的最大误差率改善范围分别为3.62%和26.85%,采样点240 ~ 360电压初始相位值的最大误差率改善范围分别为2.13%和19.86%。研究得到的有效动力系统和随机偏微分方程具有很高的近似效果,可应用于火电机组等机械设备。
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引用次数: 0
Intelligent design of display space layout based on two-stage deep learning network 基于两阶段深度学习网络的展示空间布局智能设计
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-10 DOI: 10.3233/jcm-226912
Jiaxing Liu, Yongchao Zhu, Yin Cui
In an age of big data and information overload, recommendation systems have evolved rapidly. Throughout the traditional design of interior spaces, the specialised nature of the work and the high rate of human involvement has led to high costs. With the continuous development of artificial intelligence technology, it provides a favourable environment for reducing the development cost of the system. This study proposes a two-stage modelling scheme based on deep learning networks for the intelligent design of display space layouts, divided into two parts: matching and layout, which greatly improves design efficiency. The research results show that through comparison tests, its prediction accuracy reaches more than 80%, which can well meet the matching requirements of household products. The training number of Epochs is between 15 and 30, its training curve tends to saturate and the best accuracy can reach 100%, while the running time of the hybrid algorithm proposed in this study is only 20.716 s, which is significantly better compared with other algorithms. The proposed hybrid algorithm has a running time of only 20.716 s, which is significantly better than other algorithms. The approach innovatively combines deep learning technology with computer-aided design (CAD), enabling designers to automatically generate display space layouts with good visibility and usability based on complex design constraints. This study presents an innovative application of the research methodology by combining quantitative and qualitative methods to analyse the data. The application of both methods provides a more comprehensive understanding of the problem under study and provides insight into the key factors that influence the results. The findings of this study can provide useful insights for policy makers and practitioners.
在大数据和信息过载的时代,推荐系统发展迅速。在整个传统的室内空间设计中,工作的专业性和高参与率导致了高昂的成本。随着人工智能技术的不断发展,它为降低系统的开发成本提供了有利的环境。本研究提出了一种基于深度学习网络的两阶段建模方案,用于显示空间布局的智能设计,分为匹配和布局两部分,大大提高了设计效率。研究结果表明,通过对比测试,其预测准确率达到80%以上,能够很好地满足家居产品的匹配要求。Epochs的训练次数在15到30之间,其训练曲线趋于饱和,最佳精度可达100%,而本研究提出的混合算法的运行时间仅为20.716s,与其他算法相比明显更好。所提出的混合算法的运行时间仅为20.716s,明显优于其他算法。该方法创新性地将深度学习技术与计算机辅助设计(CAD)相结合,使设计师能够根据复杂的设计约束自动生成具有良好可见性和可用性的显示空间布局。本研究通过结合定量和定性方法对数据进行分析,提出了研究方法的创新应用。这两种方法的应用可以更全面地了解所研究的问题,并深入了解影响结果的关键因素。这项研究的发现可以为政策制定者和从业者提供有用的见解。
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引用次数: 0
Research on cross-border e-commerce logistics under the sharing economy model 共享经济模式下的跨境电子商务物流研究
IF 0.5 Q4 ENGINEERING, MULTIDISCIPLINARY Pub Date : 2023-06-10 DOI: 10.3233/jcm-226922
Lin He, Qixiang Wu
As an important part of cross-border e-commerce, cross-border e-commerce logistics occupies a very important position in cross-border e-commerce, but its development in China is relatively lagging behind that of cross-border e-commerce, and this situation needs to be resolved urgently. The emergence of the sharing economy model provides possible solutions to the problems in cross-border e-commerce logistics. This article analyzes the current development status of cross-border e-commerce logistics in China, defines and analyzes the feasibility of the “sharing economy + cross-border e-commerce logistics” model, and finally proposes the “sharing economy + cross-border e-commerce logistics” model corresponding policy recommendations to better support cross-border e-commerce to achieve a high level of sustainable development.
跨境电商物流作为跨境电商的重要组成部分,在跨境电商中占有非常重要的地位,但其在中国的发展相对滞后于跨境电商,这种情况亟待解决。共享经济模式的出现为跨境电子商务物流中的问题提供了可能的解决方案。本文分析了我国跨境电商物流的发展现状,定义并分析了“共享经济+跨境电商物流”模式的可行性,最后提出“共享经济+跨境电商物流”模式的相应政策建议,更好地支持跨境电商实现高水平的可持续发展。
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引用次数: 0
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