Construction Activity Analysis of Workers Based on Human Posture Estimation Information

Identifying workers’construction activities or behaviors can enable managers to better monitor labor efficiency and construction progress.However,current activity analysis methods for construction workers rely solely on manual observations and recordings,which consumes considerable time and has high labor costs.Researchers have focused on monitoring on-site construction activities of workers.However,when multiple workers are working together,current research cannot accu rately and automatically identify the construction activity.This research proposes a deep learning framework for the automated analysis of the construction activities of multiple workers.In this framework,multiple deep neural network models are designed and used to complete worker key point extraction,worker tracking,and worker construction activity analysis.The designed framework was tested at an actual construction site,and activity recognition for multiple workers was performed,indicating the feasibility of the framework for the automated monitoring of work efficiency.

Construction of Guiding System for Growth and Development of College Students under the Student-oriented Concept

The student-oriented concept is a kind of people orientation. It emphasizes respect and support for students. It is student-centered,and is for all students. At the school level,the guiding principles of student orientation and respecting teachers and teaching must be adhered to,and corresponding reforms in the school's system,policies and environment needs to be carried out. At the university teacher level,the concept of student orientation must be adhered to in teaching,and it is regarded as the guiding concept of teaching and education and is implemented in classroom teaching and practical teaching. At the level of college administrator,the concept of student orientation must be adhered in the course of daily management and service to do better management,service and education work. In order to better implement the student-oriented concept and promote the growth and development of college students,we needs to build a mentor team for college students' growth based on political workers,establish a team of academic tutors for college students based on professional teachers and build a platform for cooperation between schools and enterprises. The innovative training mode can promote students to grow into talents.

Construction Strategies of Public Activity Spaces in Residential Districts Based on Children's Activities

The relationship between children's activities and public spaces was analyzed and summarized from three perspectives, namely, children's demands on outdoor activity spaces, factors infl uencing children's behavior requirements, and planning strategies. The paper provided theoretical support for exploring the relationship between children's activities and public spaces, and proposed planning strategies for improving use effi ciency of urban outdoor public spaces and facilities, and creating public spaces capable of meeting children's psychological needs.

Automatic Recognition of Construction Worker Activities Using Deep Learning Approaches and Wearable Inertial Sensors

The automated evaluation and analysis of employee behavior in an Industry 4.0-compliant manufacturingfirm are vital for the rapid and accurate diagnosis of work performance,particularly during the training of a new worker.Various techniques for identifying and detecting worker performance in industrial applications are based on computer vision techniques.Despite widespread com-puter vision-based approaches,it is challenging to develop technologies that assist the automated monitoring of worker actions at external working sites where cam-era deployment is problematic.Through the use of wearable inertial sensors,we propose a deep learning method for automatically recognizing the activities of construction workers.The suggested method incorporates a convolutional neural network,residual connection blocks,and multi-branch aggregate transformation modules for high-performance recognition of complicated activities such as con-struction worker tasks.The proposed approach has been evaluated using standard performance measures,such as precision,F1-score,and AUC,using a publicly available benchmark dataset known as VTT-ConIoT,which contains genuine con-struction work activities.In addition,standard deep learning models(CNNs,RNNs,and hybrid models)were developed in different empirical circumstances to compare them to the proposed model.With an average accuracy of 99.71%and an average F1-score of 99.71%,the experimentalfindings revealed that the suggested model could accurately recognize the actions of construction workers.Furthermore,we examined the impact of window size and sensor position on the identification efficiency of the proposed method.

Torsional vibration active control of hybrid construction machinery complex shafting

Due to the coaxial connection of engine, motor and pump, the dynamic characteristics of hybrid construction machinery are changed, which generates a new torsional vibration problem of multi-power sources. To reduce the torsional vibration of the hybrid construction machinery complex shafting, torsional vibration active control was proposed. The three-mass model of coaxial shafting of hybrid construction machinery was established. The PID control and the fuzzy sliding mode control were chosen to weaken torsional vibration by controlling the motor speed and torque. The simulation results show that the fuzzy sliding mode control has 12% overshoot of the PID control when the engine torque changes. The active control is effective and can realize smooth power switch.

Construction of GPS MonitoringNetwork,Characteristics of RecentCrustal Movement,and Relationbetween Stress Field andEarthquake Activity in the NingxiaRegion

GPS observation network is deployed in the central part of Ningxia, which is the juncture of the Alxa block, Ordos block and Qinghai-Xizang (Tibet) block. Using the data of five phases of repeated survey sine 1996, the current state of crustal movement in the central part of Ningxia is analyzed. From the result, we can know the following. (1) In the period from Dec. 1996 to May 1999, the central part of Ningxia had the phenomenon of left-lateral movement about the west margin of Ordos (measuring station P2) and the Lingwu fault on the east of the Yinchuan basin displayed the mode of left-lateral reverse strike slip movement. In that region, the direction of the principal stress field was NNE-SSW (with an azimuth of 29.8?; the central part to the south of the measuring station P2 displaced eastward; the vertical deformation was obviously greater than the horizontal deformation in order of magnitude; the Yinchuan basin and Qinghai-Xizang (Tibet) block were in a state of rising; the measuring station P1 in the hinterland of Ordos showed a trend of subsiding year by year; and there may be a hidden fault to exist between the measuring points P3 and P4. (2) About one year before the occurrence of moderately strong earthquakes in the vicinity of the measuring region, deformation anomalies and abnormal changes of principal stress direction can be observed by the GPS measuring stations in that region; before moderately strong earthquakes near the measuring region and before strong earthquakes in adjacent regions, the simulated GPS deformation vector field ofthat region can betoken the approximate position of the coming earthquake. These results can be regarded as the eigenvalues of earthquake prediction for consideration.

Construction of Cox7a2 fluorescent vector and its effect on cytochrome C oxidase activity in mouse Sertoli cell line TM4

Objective To construct Cox7a2 fluorescent vector and study its effect on cytochrome C oxidase ( COX) activity in mouse Sertoli cell line TM4. Methods The coding region of CoxTa2 was amplified from mouse Sertoli cell line TM4 by RT-PCR. PCR product was

Application of Farming Culture in the Construction of Eco-Park —A Case Study of Baiyunzhai Demonstration Eco-park in Chongqing City

Definitions and features of eco-park and theme park were introduced as well as their differences, it was proposed that by applying cultural themes suited to regional ecological resources in the construction of eco-park, the eco-park could achieve not only desired ecological benefits, but also social and economic benefits, and the optimal comprehensive benefits. Design of Baiyunzhai Demonstration Eco-park was taken for an example, integration of eco-park and farming culture was confirmed as the nature, principles of "adaptation to actual conditions, amended protection and construction of plant system" proposed, three functional areas of "Colorful Forest Belt, Yiyun Health Maintenance Zone, Lakefront Meditation Zone" are given on the basis of actual terrains, planning highlights and desired landscape effects expounded to promote the value of regional cultures in Chongqing by building Baiyunzhai Eco-park.

Quantifying impacts of climate and human activities on the grassland in the Three-River Headwater Region after two phases of Ecological Project

The Three-River Headwater Region(TRHR)of China is a typical representative of the alpine environment in the Central Asian plateau and the alpine grassland in the world.Grassland degradation is one of its serious eco-logical problems.The purpose of this study is to quantify the joint impacts of climate and human activities on grassland changes in TRHR after two phases of Ecological Conservation and Construction Project(Ecological Project).Grassland vegetation coverage is selected as an indicator for analyzing grassland changes.We adopt Sen+Mann-Kendall trend analysis,residual trend analysis and correlation analysis methods to analyze the trends in spatial-temporal changes and driving factors of grassland in TRHR from 2000 to 2019.The results show that:(1)The grassland has been mainly restored,and the degraded grassland area only accounts for 1.66%of TRHR.After the implementation of the first phase of the Ecological Project,the percentage of restored grassland area has significantly increased from 8.82%to 24.57%,and slightly decreased during the second phase.(2)The establish-ment of national nature reserves and the implementation of the Ecological Project have changed the situation that“the grassland inside the reserve is worse than that outside the reserve”.(3)Grassland restoration is mainly af-fected by the joint effects of climate and human activities.Nevertheless,grassland degradation is mainly affected by human activities such as overgrazing and grassland reclamation.All of these findings can enrich our under-standing of grassland restoration in TRHR.Artificial measures have certain limitations in promoting grassland restoration.Natural restoration should be considered when human beings strengthen ecological conservation and transform their production and life styles.

Spacial Distribution Characteristics, Activity and Degradation Capability of the Biofilm in Integrated Vertical-flow Constructed Wetland

The spacial distribution characteristics, activity and degradation capability of the biofilm in integrated vertical-flow constructed wetland were investigated. Results showed that the biofilm widely distributed in the substrate of integrated vertical-flow constructed wetland and mainly in the 0-10 cm top layer where the activity ofdehydrogenase of the biofilm was also higher than that of other layers. The water quality could also affect the activity of the biofilm, for the TF（1,3,5-Triphenylformazan） amount reduced by the biofim incubated in water of the higher eutrophication was larger, too. The PCP （pentachlorophenol） removal rate by the substrate with biofilm was 1.5 times that without biofilm. In total, the biofilm of the down-flow chamber appeared larger biomass, higher dehydrogenase activity and stronger degradation capability of organic contamination than that in up-flow chamber and it was the major place for removal of the organic matters in waste water.

Combined process of sequencing batch reactor activated sludge process and constructed wetland for domestic wastewater treatment

By combining sequencing batch reactor (SBR) activated sludge process and constructed wetland (CW), this study is to achieve the domestic wastewater treatment. Our purpose was to determine the optimum operating parameters of the combined process. The process involved advantages and shortages of SBR and CW. Under normal temperature, the 3rd cycle (SBR’s operation cycle is 8 h: inflow for 1 h, limited aeration for 3 h, sediment for 1 h, outflow for 1 h, and idling for 2 h; CW’s hydraulic retention time (HRT) is 24.8 h and hydraulic loading is 24.5 m3/m2 d) was the best cyclic mode. The effluents can meet the standard GB/T18921-2002: "The reuse of urban recycling water: water quality standard for scenic environment use". In the 3rd cycle, the efficiency of CW was the maximum, and energy consumption of SBR was the minimum. Under the condition of low dissolved oxygen, the removing efficiency of chemical oxygen demand (COD) and ammonia was not affected obviously. Simultaneously, nitrification and denitrification phenomena occured and phosphorus was absorbed obviously.

The Methodology of Risk Assessment in the Planning of Construction Projects

Any investment project bears some burden of risk. An investor who plans to carry out a building investment must be aware of the hazards that can be encountered while pursuing the project. Risk analysis can be supported by multi-criteria methods, which allow the user to assess the risk level while taking into account various risk-affecting factors. The aim of this article is to present and compare methods for estimating the level of risk. The article shows an example of risk assessment using methods Preliminary Hazard Assessment, Hazard Matrix and the method not used to this type of calculation Indicator method. Conducted in Article calculations show the possibility of using methods from the group of multi-criteria analysis and the results show the usefulness of the methodology developed by the author. This analysis involves a construction development designed for the tourism business. This is an interesting example due to the specific nature of the object and its location. The calculations take into account the difficult implementation conditions and the results show what you should pay attention to when planning investment.

A Preliminary Study on the Construction of Yacht Club Alliance

In order to break the restrictions for yachts to navigate across districts, to provide convenience for yacht club consumers and to inaprove the operation circumstance of yacht clubs, it is imperative to construct yacht club alliance. Based on the definition of yacht club alliance, the article interprets the significance of yacht club alliance and puts forward the approaches and methods to construct yacht club alliance. Yacht clubs can realize the alliance objectives by sharing club members, training professional yacht talents, setting up yacht lease platform, holding annual meeting and forum, press conference.

腺苷酸活化蛋白激酶介导巨噬细胞脂肪酸氧化:中药防治动脉粥样硬化的途径

背景:巨噬细胞的能量代谢和极化状态在动脉粥样硬化的进展中起关键作用。中医药通过调控巨噬细胞代谢途径展示出防治动脉粥样硬化的潜力。目的:综述腺苷酸活化蛋白激酶调控巨噬细胞能量代谢和极化状态的研究进展,并探讨中医药防治动脉粥样硬化的作用机制。方法:计算机检索Web of Science、PubMed及中国知网等数据库,检索时限为各数据库建库至2024年6月。中文检索词为“AMPK,脂肪酸氧化,巨噬细胞极化,中药,动脉粥样硬化,冠心病”等;英文检索词为“AMPK,fatty acid oxidation,macrophage polarization,Traditional Chinese Medicine,atherosclerosis,coronary heart disease”等,最终纳入62篇文献。结果与结论:①巨噬细胞的能量代谢从氧化磷酸化向糖酵解的转变,在动脉粥样硬化进展中起关键作用。在巨噬细胞中腺苷酸活化蛋白激酶激活后,通过促进脂肪酸氧化和M2型极化,发挥抗炎和稳定动脉斑块的作用。②中药单药(如人参、黄芪、黄精等)及复方(如黄连解毒汤、养心舒脉颗粒、调肝导浊方等)通过调控腺苷酸活化蛋白激酶途径干预核因子κB、过氧化物酶体增殖物激活受体γ、哺乳动物雷帕霉素靶蛋白等多条信号通路影响巨噬细胞的代谢方式,改变细胞功能,从而发挥治疗疾病的作用。③未来的研究应关注腺苷酸活化蛋白激酶、代谢与极化途径的相互作用,以及中药如何通过这些途径发挥治疗作用,为动脉粥样硬化的治疗提供新的策略。

Effects of Cd^(2+) and Pb^(2+) on the substrate biofilms in the integrated vertical-flow constructed wetland

The effects of single Cd^(2+)and Pb^(2+),and combined Cd^(2+)and Pb^(2+)on dehydrogenase activity and polysaccharide content of the substrate biofilms in the integrated vertical-flow constructed wetland(IVCW)were studied.Dehydrogenase activities decreased linearly with the increasing concentrations of Cd^(2+)and Pb^(2+)at different times(6,24,72,and 120 h).The activities at both 6 and 24 h were significantly higher than that at 72 and 120 h in the case of single and combined treatments.The single Cd^(2+)and...

再生微粉性能激活研究及应用进展

再生微粉是以混凝土、砖瓦等为主要成分的建筑垃圾制备再生骨料过程中产生的粒径小于75μm的颗粒,其主要化学组成与粉煤灰类似,具有一定的潜在活性。将再生微粉作为掺合料使用,可减少对原材料的需求,减轻对环境的污染,实现资源的循环利用。再生微粉具有组成复杂、需水量大、活性指数低等特点,直接作为掺合料使用不利于砂浆或混凝土的性能,但再生微粉中SiO_(2)、CaO和Al_(2)O_(3)含量均较高,具有较好的活性潜质,经过适当的技术处理后可以有效激发其活性,提高利用效率。目前再生微粉主要激活方式有物理激活、化学激活和热激活。热激活可以燃尽再生微粉中的有机物杂质,改变部分物质组成,从而激发其活性;物理激活通过机械力增大了再生微粉的比表面积,从而提高了再生微粉活性;化学激活主要通过加入碱性激发剂等提供碱性环境或提供可参与反应的离子,从而促进水化程度提高再生微粉活性。相关学者对再生微粉的活性激发方法及其在砂浆和混凝土中的应用进行了深入研究,这对再生微粉的应用具有积极作用。本文基于已有文献资料,对再生微粉的物理性能、化学组成、激活方式、激活机理及应用现状进行了综合评述,分析了目前再生微粉研究存在的问题并展望了其应用前景,以期为再生微粉的高品质利用提供研究基础。

积极老龄化视角下老年人心理服务体系建设路径研究

随着我国人口老龄化进程的逐步加快,老年人的心理健康状况被广泛关注,推进老年心理健康服务体系研究与建设,有助于实现积极老龄化。近年来,我国高度重视社会心理服务体系建设,但在实际推进中遇到了种种难题和瓶颈,且缺乏针对老年人等特殊群体的服务制度体系建设。根据我国老年人心理服务体系建设过程中存在的问题以及路径进行探析,提出未来应从明确责任主体和权责分工、健全运行机制、明确定位、创新服务模式、建设专业化人才队伍、建立健全评估和激励机制等方面进行进一步探索,以期为积极老龄化视角下建立符合我国实际的老年人心理服务体系建设路径提供新思路。

新型基础设施建设对区域创新创业活跃度的影响研究

以2011~2021年中国除西藏及港澳台地区外30个省份为样本,探究新型基础设施建设对区域创新创业活跃度的影响及作用机制。研究发现,新型基础设施具有显著的创新创业促进效应,该效应在制造业与服务业中、信息基建与创新基建维度、处于较低市场潜能分位点的地区中更为明显。作用机制研究表明,除劳动力市场一体化的调节作用不显著外,商品和资本市场一体化、区域创新关联,均对新型基础设施建设的创新创业促进效应具有显著强化作用。进一步的研究还发现,新型基础设施建设对创新创业活跃度的影响存在“抑制—促进—减缓”的门槛特征,且目前部分西部地区仍处于抑制阶段。

数字乡村建设对县域产业升级的影响

县域作为我国经济功能完整、运行独立的基本空间单元,在经济发展体系中的地位举足轻重。当下,我国大多数县域经济发展仍旧处于较低的水平,存在产业发展严重依赖于传统工业与农业、数字基础设施条件落后等多重掣肘。县域产业升级是实现县域经济高质量发展的重要动力,合理的技术应用会促进产业结构的升级进而影响经济增长,数字技术的蓬勃发展为县域发展带来了新的契机。在此背景下,探讨数字乡村建设是否会影响县域产业升级,通过何种渠道来影响,这种影响效应又是否会因县域经济发展水平不同而存在异质性,这一系列问题的解答对理论与实践都具有重大意义。目前关于数字乡村建设与县域产业结构升级关系的研究尚未形成一致结论,由于变量度量指标、样本观测期、理论基础的不同而有所区别。文章将北京大学新农村发展研究院和阿里研究院共同发布的县域数字乡村指数数据与中国县级层面相关数据进行匹配,最终得到2018—2020年涵盖中国1094个县(市)的面板数据,运用面板固定效应模型实证考察数字乡村建设水平对产业结构影响的总效应,并进一步开展了作用机制以及异质性效应讨论。实证结果表明:从全样本层面看,数字乡村建设能够显著促进产业结构升级转型,在进行内生性问题、替换解释变量和被解释变量、剔除特殊样本等多种稳健性检验后,该结果依然成立;从作用机制来看,数字乡村建设通过提升居民创业活跃度和收入水平促进了县域产业结构升级;异质性分析表明,数字乡村建设对中国东北、中部地区产业升级的正向效应更为明显。综合以上结果,文章提出了继续推动县域地区数字建设水平和数字应用水平、加强县域居民数字素养的培养、激发数字乡村建设的就业促进效应、发挥数字技术在经济欠发达地区的后发优势等政策建议。文章的主要贡献在于运用县域数字乡村指数科学且直观地衡量县域数字建设水平,以县域这一更加细微的尺度探讨了数字乡村建设和产业升级之间的关系,丰富现有研究,为政府加快推进数字乡村建设、实现乡村产业振兴和共同富裕目标提供指导。

普通硅酸盐水泥对负温碱激发矿渣砂浆力学性能的影响

碱激发矿渣(AAS)在0℃下能持续水化,具有应用于冬季施工的潜力。为了进一步提升AAS砂浆作为寒冷修补材料的力学性能,掺入了5%、10%、15%和20%的普通硅酸盐水泥(OPC)作为AAS中粒化高炉矿渣(GGBS)的部分替代物。结果表明:在-10℃条件下,OPC含量为15%时,1 d龄期的抗压强度和抗折强度分别提高了31.3%和25.18%,28 d龄期的抗压强度和抗折强度分别提高了4.5%和7.2%。此外,对样品的水化热、生成产物和微观结构进行了对比分析。结果显示,在AAS中加入OPC可以提高水化热,增加C(-A)-S-H的生成率,优化微观结构。