Repair of Second-Generation Recycled Fine Aggregate of Waste Concrete from Freeze-Thaw Environment by Carbonation Treatment

The reuse of waste recycled concrete from harsh environments has become a research hotspot in the field of construction.This study investigated the repair effect of carbonation treatment on second-generation recycled fine aggregate(SRFA)obtained from recycled fine aggregate concrete(RFAC)subjected to freeze-thaw(FT)cycles.Before and after carbonation,the properties of SRFA were evaluated.Carbonated second-generation recycled fine aggregate(CSRFA)at five substitution rates(0%,25%,50%,75%,100%)to replace SRFA was used to prepare carbonated second-generation recycled fine aggregate concrete(CSRFAC).The water absorption,porosity and mechanical properties of CSRFAC were tested,and its frost-resisting durability was evaluated.The results showed after carbonation treatment,the physical properties of SRFA was improved and met the requirements of II aggregate.The micro-hardness of the interfacial transition zone and attached mortar in CSRFA was 50.5%and 31.2%higher than that in SRFA,respectively.With the increase of CSRFA replacement rate,the water absorption and porosity of CSRFAC gradually decreased,and the mechanical properties and frost resistance of CSRFAC were gradually improved.Carbonation treatment effectively repairs the damage of SRFA caused by FT cycles and improves its application potential.

The Second-generation Wavelet Transform and its Application in Denoising of Seismic Data

This paper discusses the principle and procedures of the second-generation wavelet transform and its application to the denoising of seismic data. Based on lifting steps, it is a flexible wavelet construction method using linear and nonlinear spatial prediction and operators to implement the wavelet transform and to make it reversible. The lifting scheme transform -includes three steps： split, predict, and update. Deslauriers-Dubuc （4, 2） wavelet transforms are used to process both synthetic and real data in our second-generation wavelet transform. The processing results show that random noise is effectively suppressed and the signal to noise ratio improves remarkably. The lifting wavelet transform is an efficient algorithm.

Second-generation wavelet finite element based on the lifting scheme for GPR simulation

Ground-penetrating radar(GPR)is a highly efficient,fast and non-destructive exploration method for shallow surfaces.High-precision numerical simulation method is employed to improve the interpretation precision of detection.Second-generation wavelet finite element is introduced into the forward modeling of the GPR.As the finite element basis function,the second-generation wavelet scaling function constructed by the scheme is characterized as having multiple scales and resolutions.The function can change the analytical scale arbitrarily according to actual needs.We can adopt a small analysis scale at a large gradient to improve the precision of analysis while adopting a large analytical scale at a small gradient to improve the efficiency of analysis.This approach is beneficial to capture the local mutation characteristics of the solution and improve the resolution without changing mesh subdivision to realize the efficient solution of the forward GPR problem.The algorithm is applied to the numerical simulation of line current radiation source and tunnel non-dense lining model with analytical solutions.Result show that the solution results of the secondgeneration wavelet finite element are in agreement with the analytical solutions and the conventional finite element solutions,thereby verifying the accuracy of the second-generation wavelet finite element algorithm.Furthermore,the second-generation wavelet finite element algorithm can change the analysis scale arbitrarily according to the actual problem without subdividing grids again.The adaptive algorithm is superior to traditional scheme in grid refinement and basis function order increase,which makes this algorithm suitable for solving complex GPR forward-modeling problems with large gradient and singularity.

Effect of High Temperature Curing on the Frost Resistance of Recycled Aggregate Concrete and the Physical Properties of Second-Generation Recycled Coarse Aggregate under Freeze-Thaw Cycles

With the emphasis on environmental issues,the recycling of waste concrete,even recycled concrete,has become a hot spot in the field of architecture.But the repeated recycling of waste concrete used in harsh environments is still a complex problem.This paper discusses the durability and recyclability of recycled aggregate concrete(RAC)as a prefabricated material in the harsh environment,the effect of high-temperature curing(60℃,80℃,and 100℃)on the frost resistance of RAC and physical properties of the second generation recycled coarse aggregate(RCA_(2))of RAC after 300 freeze-thaw cycles were studied.The frost resistance of RAC was characterized by compressive strength,relative dynamic elastic modulus,and mass loss.As the physical properties of RCA_(2),the apparent density,water absorption,and crushing value were measured.And the SEM images of RAC after 300 freeze-thaw cycles were shown.The results indicated that the frost resistance of RAC cured at 80℃ for 7 days was comparable to that cured in the standard condition(cured for 28 days at 20℃±2℃ and 95%humidity),and the RAC cured at 100℃ was slightly worse.However,the frost resistance of RAC cured at 60℃ deteriorated seriously.The RAC cured at 80℃ for 7 days is the best.Whether after the freeze-thaw cycle or not,the RCA that curd at 60℃,80℃,and 100℃ for 7 days can also meet the requirements of Grade III RCA and be used as the aggregate of non-bearing part of prefabricated concrete components.RCA_(2) which is cured at 80℃ for 7 days had the best physical properties.

Alternating-current losses in two-layer superconducting cables consisting of second-generation superconductors coated by U-shaped ferromagnetic materials

Alternating-current losses in a two-layer superconducting cable, each layer being composed of 15 closely-spaced rectangular wires made up of second-generation superconductors when the ends of wires are coated by either a non-magnetic or strong ferromagnetic material having a U profile is numerically investigated. Computations are carried out through the finite-element method. The alternating-current losses do not increase significantly if the relative permeability of the coating is increased three orders of magnitude, provided that the current amplitude is less than half of the critical current in a superconducting wire. However, the losses are much higher for ferromagnetic coating if the amplitude of the applied current oscillating at 50 Hz is close to the critical current. The ferromagnetic coating is seen to accumulate the magnetic field lines normally on its surfaces, while the field lines are parallel to the long axes of the wires, leading to more significant flux penetration in the coated regions. This facilitates a uniform low-loss current flow in the uncoated regions of the wires. In contrast, coating with a non-magnetic material gives rise to a considerably smaller current flow in the uncoated regions, whereas the low-loss flow is maintained in the coated regions. Moreover, the current flows in opposite directions in the coated and uncoated regions, where the direction in each region is converse for the two materials.

Mutagenic Effects of Spaceflight Treatment on the Second-Generation Seeds of Alfalfa

[ Objective] To explore the effects of spaceflight on the second-generation seeds of alfalfa and provide a theoretical basis for mutation breeding. [Method] The seeds of Medicago stavia L. lines no. 1, no. 2 and no. 4 were carried into space by the Shijian-8 seed breeding satellite for a 15-d spaceflight treatment. After returning to the ground, seedlings were transplanted to field. Traits of the second-generation seeds of alfalfa were evaluated. [Result] The 1 000-grain weight of the second-generation seeds were 5% -9% significantly higher than that the control （P 〈 0.05）. The germination rate, seedling weight, shoot length and root length were significantly increased （P 〈 0.05）. The hard seed rate and the rate of moldy seeds were significantly decreased （ P 〈 0.05）. However, the rate of dead seeds was increased. [ Conclusion] Spaceflight treatment has positive mutagenic effects on the second-generation seeds of alfalfa.

Role of Second-Generation Drug-Eluting Stents and Bypass Grafting in Coronary Artery Disease:A Systematic Review and Meta-analysis

Background:The safety and efficacy of coronary artery bypass grafting(CABG)and second-generation drug-eluting stents(DESs)in patients with coronary artery disease(CAD)remain controversial.Therefore we aimed to compare the outcomes of CAD patients treated with CABG and second-generation DESs.Methods:We systematically searched the PubMed,Cochrane Library,Ovid,and Elsevier databases.Studies comparing second-generation DESs with CABG in CAD patients were included.RevMan 5.3 was used to extract and pool the data from the applicable studies.Results:Six trials(N=6604 participants)were included in this meta-analysis.Among all of the CAD patients,second-generation DESs were associated with no differences in the risks of all-cause death[risk ratio(RR)1.18,95% confi dence interval(CI)0.98–1.43,P=0.09],cardiovascular death(RR 1.14,95% CI 0.81–1.59,P=0.45),myocardial infarction(RR 1.22,95% CI 0.98–1.54,P=0.08),and stroke(RR 0.83,95% CI 0.59–1.17,P=0.29),but increased the risks of revascularization(RR 1.95,95% CI 1.66–2.30,P<0.001)and major adverse cardiac and cerebrovascular events(RR 1.72,95% CI:1.31–2.26,P<0.001)when compared with CABG.Conclusions:In the treatment of CAD patients,second-generation DESs was not associated with increased risks of all-cause death,cardiovascular death,myocardial infarction,and stroke,but increased the risks of revascularization and major adverse cardiac and cerebrovascular events when compared with CABG.

Thirty years of scientific research on second-generation antipsychotic drugs in Japan: A bibliometric analysis

Aims:Research on second-generation antipsychotic drugs (SGAs) has experienced great development in last decades.We did a bibliometric study on the scientific publications on SGAs in Japan.Methods: With theEMBASEandMEDLINEdatabases, we chose papers published from Japan with SGA descriptors. Price’s law and Bradford’s law has been used as bibliometric indicators for quantitating production and dispersion, respectively, of published papers on SGAs. We also calculated the participation index of different countries, and correlated those bibliometric data with some social and health data from Japan (such as totalper capitaexpenditure on health and gross domestic expenditure on research and development). Results: A sum of 669 original documents were published from Japan from 1982 to 2011. Those results fulfilled Price’s law, with scientific production on SGAs showing exponential growth (correlation coefficientr= 0.9261, as against anr= 0.8709 after linear adjustment). The most studied SGAs in Japan wererisperidone (n= 192), aripiprazole (n= 109), and olanzapine (n= 106). Division of documents into Bradford zones yielded a nucleus occupied exclusively by theProgress in Neuro-Psychopharmacology and Biological Psychiatry(49 articles). Those publications were in 157 different journals. Seven of the first 10 frequently used journals had an impact factor of being greater than 3. Conclusions: The SGA publications in Japan have been through exponential growth over the studied period, without evidence of reaching a saturation point.

The Application of Automatic Routing Technology in the Logistics System based on Intemet of Things

According to the development trend of intelligent logistics in our country, combining database, communication, GIS （Geography lnfolrnation System） technology, the paper study the key core technology of each module monitoring platform for vehicle monitoring system, and establish logistics transport vehicle monitoring platform that oriented small and medium-sized logistics enterprises, to realize the whole process of real-time monitoring for logistics and transport the vehicle from the warehouse to transportation, promote the informationization of logistics and transport.

An Analysis of the Public Participation in Environmental Management in the Era of＂Intemet＋＂

In recent years, the application of Intemet technology in the public participation in environmental management has been developing continuously in China. From the case of Maoming PX Incident and the case of Chai＇s ＂Under the Dome,＂ it can be seen that Internet technology has both advantages of promoting the public participation in environmental management and disadvantages of the lacks of normative guidance. Government departments should not only adapt to the ＂Internet＋＂ era and guide the public use of Internet technology in environment management, but also strengthen the construction of laws and regulations and the construction of institutional mechanisms to standardize concrete links of the public participation in environmental management through the Intemet and finally establish a system of the public participation in environmental management in the era of＂lnternet＋.＂

Research on Mobile Information Access based on Intemet of Things Technology

The paper design mobile information collection system based on lnternet of Things, implemented access gateway by smart mobile devices through a variety of ways, such as Wi-Fi and access the underlying perceptual information based on ZigBee wireless sensor networks. On the one hand, For information sensitivity of the sensor network, we design the mobile terminal through the gateway access authentication protocol, and effective solute the authentication and infbnnation between mobile devices and gateways, gateway and sensor network nodes obtain permission problem; on the other hand, according to the practical application of mobile information collection characteristics, the paper proposed information collection strategy based on historical data movement path to solve the problem for too long the device connection is established when the mobile smart devices collecting information along fixed lines, increasing the actual data transmission time and improve the efficiency of information transmission.

Research on the transformation and upgrading of manufacturing industry based on the Intemet Plus

Along with the development oflntemet plus and information technology, the future industrial pattern will appear new change. The Internet represents a new economic model, and it uses the results of the development of the developed communication technology and the Internet platform with the existing various areas of known and unknown fields of social and economic to integration depth, giving full play to the advantages of integration, enhancing the innovation ability of the economic and the production adaptability, to create more new opportunities, thus forming a sustainable excellent ecosystem.

An empirical study of the new mode of educating people through the school-enterprise cooperation in private universities based on "Intemet+"

With the use of the MIntemet+" thinking, vigorously carry out the innovation of the school-enterprise cooperation mode, and improve and promote the quality of the school-enterprise cooperation, which is a major task faced by all kinds of the private colleges and universities. The school-enterprise cooperation, as a personnel training mode adapting to the development of the times, makes ftill use of the resources of universities and enterprises, which is of great significance to strengthen the mutually beneficial cooperation between schools and enterprises and to train the practical talents. However, problems such as the imperfect equipment of private colleges and universities, the inactive participation of the enterprises in the cooperation, and the lack of communication and exchange between the two sides, still exist. Therefore, it is of great practical significance for the development of the national education and the social progress to put forward the improvement measures and accelerate the development of the efficient and mutually beneficial mode of the school-enterprise cooperation.

“孔乙己文学”视域下青年价值观塑造的挑战及其应对

“孔乙己文学”作为当前社会热点话题,反映了青年一代所面临的迷茫与困顿。“孔乙己文学”现象是以部分青年创新意识不足、从众心理滋生,劳动观念弱化、拜金主义泛滥,奋斗主义消解、躺平现象蔓延为表征的青年价值观新样态,对新时代青年价值观塑造带来严重挑战。其得以生成,既是社会身份预期的结构失位,也是温室型家庭教育机制的结果,还与网络戏谑语言表达和现代性经济社会高度内卷综合形塑密不可分。为有效应对青年价值观塑造所面临的挑战,需要社会、家庭、媒体、政府的通力合作,在社会发展环境、家庭教育机制、媒体社会责任、政府关照诉求等方面作出正向回应。

智慧保护地管理云平台系统设计与研究

针对保护地数据收集较为困难、管理云平台的利用普遍低下等问题,对智慧保护地管理云平台系统进行设计与研究。采用分布式系统对智慧保护地管理云平台进行设计,其结构可分为感知层、网络层和应用层。感知层主要采用无人机遥感技术实现对保护地数据的采集;网络层在窄带物联网技术上增加一个定时节能模块,可在对采集到的信息传送时节省功耗;应用层主要是对数据存储进行设计,可避免产生冗余重复数据,节省数据空间,增强索引能力和响应速度。通过试验,验证了数据采集的完整度和帧图像分辨率的稳定性都较传统方法更为优越。管理云平台数据存储占用空间较传统方法少,且随着数据量的增加,增长幅度更为均匀。

医疗卫生机构健康科普网络音频平台的运营策略——以“长三角公共卫生(网络)电台”为例

2021年,阿基米德传媒与健康促进、疾病预防与医疗相关机构共同启动首个区域化、以公共卫生为主题的网络电台——“长三角公共卫生(网络)电台”。本文拟通过对“长三角公共卫生(网络)电台”运营策略的探讨,为更多医疗卫生机构建设健康科普网络电台提供引领示范。

基于GPRS业务的远程移动监控系统

目前,GPS定位信息的传输方式主要以GSM的SMS或电路交换方式进行,其缺点是实时性差、费用高、信息承载量小。电信部门推出的GPRS业务,具有实时性好,数据按流量收费且费用低廉等特点,这使得采用以GPRS为主、GSM为辅的定位信息传输方法代替单一的GSM传输方式成为新的发展趋势。文中详细介绍了将GPRS、GSMI、nternet、GIS、GPS等技术融为一体的远程监控系统的设计,并给出了移动终端具体应用实例。

新型的网络团购模式:主动式网络团购

本文在分析比较当前网络团购模式的基础上,论述了由大型零售企业作为网络团购的组织者而形成的主动式网络团购新型模式,主要包括主动式网络团购模式的运作机制、形成要素、服务内容以及制度保障机制、主动式网络团购的支撑体系。这种网购模式具有主动性、主导性和完好性的特征,实现了消费者、大型零售企业、生产厂商之间的三赢,具有良好的应用前景。

中国物联网信息服务系统研究

基于RFID(Radio Frequency Identification)和物联网技术综述了物联网国内外发展现状,设计了一种中国物联网体系架构.结合本结构提出了中国物联网信息服务系统(RFID-IS)的设计方法.为了实现中国物联网的有效管理,利用SNMP协议的优点,提出了中国物联网网络管理协议结构(RFID-MP).为中国物联网的架构、信息服务系统和网络管理协议的发展和研究提供了参考.