图像分割技术在煤矿生产中的应用

由于煤矿领域特殊的应用环境,常用的图像分割技术直接对煤矿井下视频监控图像的分割往往得不到理想的效果。本文针对煤矿应用领域的环境要求,对常用的几种图像分割算法进行深入比较分析。     

噪音交易影响中国股市效率的实证分析

适度的噪音能够增加市场的流动性，但噪音交易的过度存在会对股票市场的效率产生负面的影响。本文借用分形理论的R／S分析法，对中国股市的收益率进行了实证检验，计算其赫斯特（hurst）指数，并与美国和香港的赫斯特指数进行横向比较，以此来分析中国股市的有效性以及噪音交易的程度。     

噪音交易与股价过度波动:理论与中国经验分析

中国股市股票价格的波动性过大,引起这种现象的一个重要原因是噪音交易的存在和频繁发生。本文采用事件分析法,随机抽取了上海A股市场的近200种股票作为样本,通过构建正反馈交易的"涨幅组合",对噪音交易者投资的累积异常收益率进行检验。结果表明:股市过度波动与噪音交易频繁有密切的联系;噪音交易者通常要承受巨大的风险,但其投资收益率一般情况下却为负。     

两步法快速复原噪声模糊图像

本文提出了一种两步复原法,以用于复原被脉冲噪声干扰的模糊图像。第一步,对离群点进行识别,即那些疑似被脉冲噪声损坏的像素,并将剩余的像素视为基本非离群点。第二步,基于非离群像素,利用变分法对图像进行去模糊和去噪声。实验结果显示,使用该方法复原后图像的峰值信噪比dB值较采用典型变分法有所提高。     

“Ongoing harm under a prettier,brighter umbrella”: A critical analysis of reconciliation talk in Canadian settler philanthropy

Engagement with the concept of reconciliation, broadly understood as the process or goal of transforming relations among Canada's Indigenous and non-Indigenous peoples, became commonplace in the philanthropic sector after the 2015 release of the final report of the Truth and Reconciliation Commission of Canada (TRC). Institutional responses to the TRC (e.g., by universities, businesses, healthcare institutions, governments, etc.) have been widely discussed in the academic literature—lauded by some as pivotal to the transformation of Indigenous/settler relations, and critiqued by many as no more than a shift in rhetoric covering over ongoing racialized colonial violence. Through a critical analysis of reconciliation talk as articulated through blog posts, press articles, conference recordings, webinars, and professional development resources produced by and for progressive settler philanthropy from 2012 to 2020, this essay analyses the hearty uptake of reconciliation in the sector. I bring these texts into dialog with the larger body of critiques of reconciliation, with the aim of interrogating settler philanthropy's place and roles in Canada's settler colonial order, past, and present. I focus on common terms and concepts that appear in conjunction with reconciliation talk such as diversity and inclusion; community-engagement and relationship building; learning and listening. I also explore instances of obfuscation and renaming, such as a scarcity of explicit references to race and racism, colonialism and white supremacy and a tendency to relegate colonialism to the past in texts produced by non-Indigenous authors. The themes I identify across these texts resemble those apparent in other institutional contexts. Reconciliation talk has potential to transform how settler philanthropy engages with Indigenous communities. Yet, many of the most urgent critiques raised in other fields apply to this context. Ultimately, I conclude, reconciliation talk may elevate and uphold—and indeed conceal—the white supremacist, colonial status quo in settler philanthropy and in Canada more broadly. Occlusions and renaming common to settler philanthropy's reconciliation talk contribute to what Vimalassery et al. describe as “colonial unknowing” and what Tuck and Yang call “settler moves to innocence.” In these ways, reconciliation serves a mystifying function for settler philanthropy, masking ongoing coloniality, absolving settler guilt, and avoiding more radical, transformative possibilities.     

提高微弱信号测量准确度的方法和实践

由于微弱信号极易受到各种干扰因素的影响,因此对它们进行精确的测量就变得非常的困难和复杂。本文分析了影响微弱信号检测的主要因素,通过实例分析给出了提高微弱信号测量准确度的方法。     

燃机电厂厂区噪声治理与总平面布置研究

燃机电厂环保节能,大多建在城市近郊,但厂界噪声和周围声环境的达标却成了极其突出的问题。本文针对电厂噪声污染特点,分析了噪声源,结合总平面布置对不同区域噪声源采取了相应的噪声控制技术,以期达到国家环保要求,更好地解决燃机电厂的噪声污染问题。     

中国股市噪声交易行为有效性实证研究

本文以上海证券交易所上市交易的所有A股为研究对象,采集从1997年12月31日到2005年12月31日为止共8个年度的所有股票的日交易数据作为样本数据,采用事件研究法对中国股市进行噪声交易行为有效性实证检验,结果发现：6种噪声交易组合全部亏损,且噪声交易正确的概率远远低于错误的概率。该结果表明,在中国股市,噪声交易行为不是一种有效的的盈利行为;这一结果可以说是中国股市股价大幅波动具有市场操纵性质的间接证据。     

当前我国证券市场的噪声交易问题及其控制

当前证券市场存在的噪声交易问题,是造成地度投机和内幕交易以至导致整个市场的效率降低的重要因素。本文借鉴金融噪声理论对中国证券市场进行剖析,阐述了造成这种现象的根本性原因,提出减少噪声交易的对策措施。     

我国防治白色污染存在的问题及对策

本文从我国白色污染的现状出发，分析了在防治白色污染方面存在的问题，提出了白色污染防治的对策。