一种基于纠缠交换的远程量子链路建立策略

提出一种以纠缠交换作为核心技术的远程量子链路建立策略，建立了基于链路状态矩阵的量子链路模型并分析了纠缠交换的实现和矩阵表示。提出了链路协议栈以及端到端的建立策略，分析了矩阵控制下的纠缠交换和纠缠纯化流程，计算得出了在基于自动重传请求(ARQ)协议经典信息辅助下的链路时延和吞吐量与节点数、误帧率、平均距离、操作成功率之间的定量关系。仿真结果表明：处于同一状态区间内的链路性能随节点数呈现出较为一致和平缓的变化；不同区间内的链路性能差异较为显著，在节点平均距离为1 km、经典信息误帧率为0、纠缠保真度为0.98的情况下，当节点数分别为32、33和34时，链路时延分别为1.0770 ms、1.0903 ms和1.6690 ms，链路吞吐量分别为0.9285 kb/s、0.9172 kb/s和0.5992 kb/s。     

供应链风险评估:一个贝叶斯——量子决策的推理网络研究范式

为了分析供应链运作过程中存在风险的性质,采用贝叶斯网的方式,构建了供应链风险因素、风险事件之间的系统模型,并在量子概率的基础上,分析各种风险发生的规律,并分析了供应链风险事件之间存在的共同发生的可能性。结论认为:供应链风险是一个具有多源、多维、交叉等多种属性的复杂系统,其中,道德风险与牛鞭效应最容易发生,双重边际效应、资金链断裂以及牛鞭效应的影响最大;若干种风险之间按照一个较高的概率发生着共振现象。     

运动耦合型全同二能级原子经过单模光场后三体纠缠度的研究

在考虑原子运动和原子间的偶极相互作用的情况下,从研究两个处在全基态的全同二能级原子和单模光场的相互作用入手,对得到的三体w纠缠态的纠缠度进行了计算和分析,而后进一步研究了两全同二能级原子处于GHZ态时与真空场相互作用后的量子纠缠演化。     

Fashion interest as a driver for consumer textile waste management: reuse,recycle or disposal

Past studies have considered the impact of fashion on consumer textile disposal behaviour, but have focused mainly on drivers of clothing waste. There is a lack of research that examines consumer attitudes towards fashion and their disposal methods. This study conducted an online survey of 410 people in Ontario, Canada with varying demographic characteristics to assess how they currently manage their textile waste including resell, swap, take‐back, donation and disposal. Respondents were asked about their fashion interest and shopping frequency and were assigned a fashion index value. The fashion index value is not a means of grouping consumers but is instead a continuum to model interest in fashion, with one extreme representing fashion consumers and the other representing non‐fashion consumers. Statistical analysis was then used to establish whether there is a link between textile waste behaviour and fashion index. The results indicate that consumers with a high fashion index (i.e. fashion consumers) and consumers with low fashion index (i.e. non‐fashion consumers) manage their textile waste differently. While the majority of participants donate and dispose of unwanted clothes, fashion consumers are more interested and more likely to participate in alternative methods (e.g. resell, swap, and take back) for removing unwanted textiles. Although fashion consumers produce more textile waste than non‐fashion consumers, textile consumption cannot be directly equated with textile waste since fashion consumers were found to have a lower disposal rate than non‐fashion consumers (38 percent to 50 percent, respectively). The distinct disposal characteristics of fashion and non‐fashion consumers (i.e. interest and willingness to participate in alternative channels) allows strategies to be tailored accordingly so that the amount of waste going to landfill can be reduced.     

Vinyl record: a cultural icon

In this paper, we use the case of the vinyl record to show that iconic objects become meaningful via a dual process. First, they offer immersive engagements which structure user interpretations through various material experiences of handling, use, and extension. Second, they always work via entanglements with related material ecologies such as turntables, speakers, mixers, and rituals of object care. Additionally, these engagements are complimented by a mediation process which emplaces the vinyl historically, culturally, spatially, and also politically, especially in the context of digitalization. This relational process means that both the material affordances and entanglements of vinyl allow us to feel, handle, experience, project, and share its iconicity. The materially mediated meanings of vinyl enabled it to retain currency in independent and collector’s markets and thus resist the planned obsolescence and eventually attain the status of celebrity commodity with totemic power in music communities. This performative aspect of vinyl markets also means that consumers read closely the signals and symbols regarding vinyl’s status, as its various user groups and champions try to interpret its future, protect, or challenge its current position. Vinyl’s future, and the larger expansion of pressing plants and innovative turntable production around it, largely depend on processes of cultural and status mobility. In the current phase of market expansion, vinyl’s status might be challenged by its own success. Neither a fashion cycle phenomenon, nor simple market conditions explain vinyl’s longevity. Rather, cultural contextualization of vinyl as thing and commodity is crucial for avoiding symbolic pollution and retaining sacred aura.     

Risk‐Utility Paradigms for Statistical Disclosure Limitation: How to Think,But Not How to Act

Risk‐utility formulations for problems of statistical disclosure limitation are now common. We argue that these approaches are powerful guides to official statistics agencies in regard to how to think about disclosure limitation problems, but that they fall short in essential ways from providing a sound basis for acting upon the problems. We illustrate this position in three specific contexts—transparency, tabular data and survey weights, with shorter consideration of two key emerging issues—longitudinal data and the use of administrative data to augment surveys.     

电池交换式电动汽车换电站选址优化方法

为实现电动汽车快速补能,面向电池交换的充电方式,研究了城市路网上电动汽车换电站的选址问题。首先研究了电动汽车用户的路径选择,基于交通网络均衡状态和换电站选址方案的相互影响,建立站点建设成本和出行成本之和最小为目标的换电站选址优化模型。然后预测不同方案下的交通网络均衡状态,并依据预测结果评价选址方案的优劣,最后设计求解算法,利用襄阳东津新区的路网及居民出行数据进行算例分析,验证模型及算法的可靠性,求得换电站的最优选址及换电需求。研究表明,建立的电池交换式电动汽车换电站优化模型可以获得路网路段流量及换电站处的换电需求量,给出最优的选址方案及换电站建设时序;电动汽车混入率对换电站布设、交通网络均衡状态有较复杂的影响;交换站数量的增加能减少出行成本,但边际作用递减。研究结果可为城市换电站的规划提供决策参考。     

A Benefit Analysis of Electric Vehicle Battery Swapping and Leasing Modes in China

This article discusses three most potential operators in the electric vehicle (EV) market of China, including power companies, battery manufacturers and gasoline enterprises. We propose five commercial modes of battery swapping and leasing service (BSLS) and analyze their benefits. The simulation results indicate that oil companies are the least competitive operators, whereas battery manufacturers are the best. It is unadvisable for operators to acquire batteries via leasing. The sensitivity analysis indicates that the increase in vehicle weight, gasoline price, the quantity of EVs and V2G electricity price will expand operators’ profit respectively, while the increase in discount rate works inversely.     

Consumer–brand assemblages in advertising: an analysis of skin,identity, and tattoos in ads

This paper discusses how the use of tattoos in advertising renders diverse brand–consumer assemblages visible. In considering advertising practitioners as professionals of entanglement, the paper emphasizes the embeddedness of practitioners’ use of tattoo symbolism in institutionalized marketing systems and in the cultural history of tattooing. In accordance with the recent emphasis on the importance of material devices for understanding contemporary sociality, this paper presents a semiotic analysis of a convenience sample of advertisements depicting tattoos. Tattoos are productive for the study of brand–consumer assemblages because they are situated on the human skin, which is a mediator between the individual and the socio-material world. Furthermore, tattoos reproduce discourses of both mainstream fashion and deviant subcultural identification, which imbue tattoo symbolism with communicative potency. This analysis demonstrates how the emergence of brand tattoos in advertising challenges the dominant consumer centrism in consumer research and suggests a networked, emerging understanding of the subject in which agency is distributed in socio-technical assemblages.     

世界各国竞相研发量子通信

随着电子信息技术的迅猛发展,安全高效的信息传输日益受到人们的关注。量子通信作为当今通信领域的新宠,以其绝对安全性、超大信通容量、超高通信速率、远距离传输和信息高效率等特点,引起了国际范围的广泛关注。本文概述了量子通信及其特点和应用,追溯了量子通信起源．介绍了美国、日本、欧洲等国的量子通信研究与发展状况,展望了量子通信发展前景。