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金属夹芯结构制造中的T型接头Stake焊接方法研究
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作者 谷侃锋 魏强 赵明扬 《热加工工艺》 CSCD 北大核心 2012年第23期134-137,140,共5页
T型接头的Stake焊接方法是实现金属夹芯板焊接制造的关键技术之一。为了论证焊接制造金属夹芯板的可行性,本文通过实验对比研究了在单一激光、TIG电弧和激光-TIG电弧复合等三种焊接工艺下,钛合金薄板T型接头Stake焊接焊缝成形特点及影... T型接头的Stake焊接方法是实现金属夹芯板焊接制造的关键技术之一。为了论证焊接制造金属夹芯板的可行性,本文通过实验对比研究了在单一激光、TIG电弧和激光-TIG电弧复合等三种焊接工艺下,钛合金薄板T型接头Stake焊接焊缝成形特点及影响因素。结果表明,激光-TIG电弧焊是实现钛合金薄板T型接头Stake焊接的理想工艺,在焊缝组织、焊接效率、焊缝成形、间隙适应性等方面比单一激光或TIG焊接工艺有明显的优势,可以应用于金属夹芯板的焊接制造。 展开更多
关键词 金属夹芯结构 T型接头 激光-TIG复合焊 stake
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从外貌模式到回应模式——论斯泰克(R.E.Stake)的课程评价理论 被引量:5
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作者 金家新 兰英 《外国教育研究》 CSSCI 北大核心 2010年第10期14-17,共4页
在继承和发展以课程目标为评价依据的泰勒评价原理,考量评价的"先在因素"、"实施因素"和"结果因素"的基础上,斯泰克建立了以理论与哲学为基础、描述矩阵与判断矩阵为框架的课程评价"外貌模式"... 在继承和发展以课程目标为评价依据的泰勒评价原理,考量评价的"先在因素"、"实施因素"和"结果因素"的基础上,斯泰克建立了以理论与哲学为基础、描述矩阵与判断矩阵为框架的课程评价"外貌模式"。外貌评价模式的建立为斯泰克进一步提出教育评价"回应模式"奠定了基础。回应评价以所有与方案有利害关系或以切身利益者所关心的问题为中心进行评价,重视回应评价委托人的需要和价值观,代表着课程与教学评价的发展方向与趋势。 展开更多
关键词 外貌模式 回应模式 课程评价 斯泰克
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The Washback Effect of a High-stakes Oral Test 被引量:1
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作者 黄丽燕 《山东师范大学外国语学院学报(基础英语教育)》 2006年第5期30-39,共10页
In 2004,Guangzhou Education Bureau introduced an English oral test into its existing Guangzhou Senior Secondary School Entrance Examination(hereafter,SSSEE)with the intention of shifting from grammar-based English tea... In 2004,Guangzhou Education Bureau introduced an English oral test into its existing Guangzhou Senior Secondary School Entrance Examination(hereafter,SSSEE)with the intention of shifting from grammar-based English teaching at junior secondary school to a communication-based teaching approach.This paper presents preliminary research findings related to the washback effects of the oral test on teaching.The data were collected via focus groups and questionnaires.The nature of the washback effects of the SSSEE English oral test is discussed from six dimensions.The study shows that washback is a complex phenomenon and it can be conceptualised via a multidimensional model. 展开更多
关键词 washback English teaching high-stakes oral test
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新的爆破法(Stake法)制浆 被引量:1
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作者 岩崎誠 周国华 《国外造纸》 1991年第4期3-9,共7页
一、Stake法(S-制浆法) 1.前言据报道,加拿大的STAKE公司,开发了连续爆破装置,是在爆破的前段,采取用药液处理的方法,所得纸浆强度可与LBKP相当,得率高到90~94%,能耗比CTMP也格外低,其漂白性在H_2O_2用量为4%时自度可达82%左右,据说是... 一、Stake法(S-制浆法) 1.前言据报道,加拿大的STAKE公司,开发了连续爆破装置,是在爆破的前段,采取用药液处理的方法,所得纸浆强度可与LBKP相当,得率高到90~94%,能耗比CTMP也格外低,其漂白性在H_2O_2用量为4%时自度可达82%左右,据说是一种很好的制浆法。这种方法虽然也是爆破法。 展开更多
关键词 爆破法 制浆 stake 造纸 生产工艺
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Valuing ecological resources through stakeholder participation
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作者 George O. Rogers Eric K. Bardenhagen 《Open Journal of Ecology》 2013年第5期343-353,共11页
This paper presents a pilot effort to identify a methodology to more efficiently codify, quantify and illustrate the intrinsic values associated with ecological resources as expressed by stakeholders. Existing methodo... This paper presents a pilot effort to identify a methodology to more efficiently codify, quantify and illustrate the intrinsic values associated with ecological resources as expressed by stakeholders. Existing methodologies examine the value of ecological resources, but are often criticized for their monetary focus. These methods generally produce quasi-market values for non-market resources. The natural and cultural resources associated with a national park are analyzed in terms of the expressed values of active stakeholders to quantitatively produce multiple dimensions of value for each resource relative to all others. The resulting abstract and graphical value-space quantitatively reflects stakeholder participation, reflects non-market intrinsic value, and proactively contributes to environmental management and decision making. 展开更多
关键词 Ecological Resource VALUATION Intrinsic Values Place-Based VALUATION Natural Resources Value-Space stake-Holder PARTICIPATION
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Sinopec Adds Brazil Offshore Oil Reserves with Purchase of Galp Unit Stake
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《China's Foreign Trade》 2011年第23期22-22,共1页
According to Bloomberg on November 12, China Petrochemical Corp., Asia’s biggest ref iner, agreed to buy a 30 percent stake in Galp Energia SGPS SA (GALP)’s Brazilian unit, its second invest- ment in offshore oil fi... According to Bloomberg on November 12, China Petrochemical Corp., Asia’s biggest ref iner, agreed to buy a 30 percent stake in Galp Energia SGPS SA (GALP)’s Brazilian unit, its second invest- ment in offshore oil fields in Latin America’s largest economy in as many years. 展开更多
关键词 US Sinopec Adds Brazil Offshore Oil Reserves with Purchase of Galp Unit stake
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BP Plans to Sell Stake in Chinese Joint Venture
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《China Oil & Gas》 CAS 2016年第3期58-59,共2页
BP,the UK energy group,is planning to sell one of its biggest Chinese investments,by disposing of its 50percent stake in the SECCO petrochemicals plant near Shanghai.BP is the latest western oil company to curtail act... BP,the UK energy group,is planning to sell one of its biggest Chinese investments,by disposing of its 50percent stake in the SECCO petrochemicals plant near Shanghai.BP is the latest western oil company to curtail activity in China,as energy groups reel from low crude and petrochemical prices.China’s slow liberalization 展开更多
关键词 BP Plans to Sell stake in Chinese Joint Venture
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High Stakes for Egypt
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作者 Bob Wekesa 《ChinAfrica》 2012年第3期28-28,共1页
How Egypt can attempt to revert back to its former glory OPTIMISTS who entertained thoughts that Egypt would revert to its former state of peace and tranquility after parliamentary elections must have been badly jolte... How Egypt can attempt to revert back to its former glory OPTIMISTS who entertained thoughts that Egypt would revert to its former state of peace and tranquility after parliamentary elections must have been badly jolted in early February.This is when a fairly innocuous event,a football match between two traditionally rival teams,ended with the death of over 70 people.How a sporting event can lead to such sectarian-motivated carnage underpins the deep-seated animosities unleashed after the January 25,2011 revo- 展开更多
关键词 High stakes for Egypt
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From Learning for CET to "Study for Motherland": High-Stake of CET Accelerates the Forming of New National Identity of College Students
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作者 ZHANG Xi 《Sino-US English Teaching》 2011年第3期188-193,共6页
关键词 英语教学 教学方法 阅读 翻译
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禄利、价值与政局:朱彝尊与徐乾学交游论
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作者 崔晓新 《嘉兴学院学报》 2024年第3期5-11,共7页
清初权臣徐乾学与一代文儒朱彝尊志趣投合、互有短长,两人缔结文士之交后又因仕宦际遇而续增同僚之谊。便二人往来颇有断续,禄利与价值系徐、朱交谊中断与赓续之根本,而作为影响二人交谊走势重要因素的仕宦擢罢,实皆取决于康熙皇帝于政... 清初权臣徐乾学与一代文儒朱彝尊志趣投合、互有短长,两人缔结文士之交后又因仕宦际遇而续增同僚之谊。便二人往来颇有断续,禄利与价值系徐、朱交谊中断与赓续之根本,而作为影响二人交谊走势重要因素的仕宦擢罢,实皆取决于康熙皇帝于政治时局之布控。徐乾学与朱彝尊交谊案例既体现徐、朱二氏品性胸襟的差异,又映射出当时利益为先,充满暗算、倾轧与妥协的士人众生面相与复杂官场生态,而二人的仕宦遭际又从更深层面反映出清初政局的变化与政策的相应调整。 展开更多
关键词 徐乾学 朱彝尊 交游 禄利 价值 政局
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ESG发展对企业新质生产力影响的研究——来自中国A股上市企业的经验证据 被引量:2
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作者 宋佳 张金昌 潘艺 《当代经济管理》 北大核心 2024年第6期1-11,共11页
文章基于2015—2022年A股上市企业财务报表数据,实证研究了ESG发展对企业新质生产力的影响,结果显示:ESG发展对企业新质生产力水平的提升有显著促进作用;异质性分析结果显示ESG发展对促进非国有企业、中小微企业、实体企业的新质生产力... 文章基于2015—2022年A股上市企业财务报表数据,实证研究了ESG发展对企业新质生产力的影响,结果显示:ESG发展对企业新质生产力水平的提升有显著促进作用;异质性分析结果显示ESG发展对促进非国有企业、中小微企业、实体企业的新质生产力水平的作用更显著;机制研究表明ESG发展能改善企业与利益相关者的关系,降低中间品成本和负债融资成本水平、增加机构持股比例,进而促进企业新质生产力水平的提升。研究结果为促进企业ESG发展,加快企业形成新质生产力,促进企业高质量发展提供有用的经验证据。 展开更多
关键词 ESG 新质生产力 利益相关者 熵值法
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Thorny roses:The motivations and economic consequences of holding equity stakes in financial institutions for China's listed nonfinancial firms 被引量:7
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作者 Liping Xu Yu Xin 《China Journal of Accounting Research》 2017年第2期105-125,共21页
The reforms of China's financial system have significantly changed the country's financial sector. One noteworthy phenomenon is that many nonfinancial firms have obtained equity stakes in financial institution... The reforms of China's financial system have significantly changed the country's financial sector. One noteworthy phenomenon is that many nonfinancial firms have obtained equity stakes in financial institutions. This study investigates the motivations behind and economic consequences of this recent proliferation of investments in financial institutions by nonfinancial listed firms. We find that the motivations for holding equity stakes in financial institutions include alleviating the pressure of industry competition, reducing transaction costs, and diversification to reduce risk. These investments, however, have double-edged effects on the performance of the investing firms. While their investment income increases, their operating income and overall return on assets decrease, as the investment income cannot compensate for the decrease in other operating income. The investing firms' cost of debt also increases, their cash-holding decreases, and stock price performance does not improve after investing in financial institutions. These effects contrast with the enthusiasm nonfinancial listed firms have for investing in financial institutions. The empirical findings in this study can inform financial industry regulators and decision-makers in listed firms. We advise nonfinancial firms to be cautious when considering investing in financial institutions. 展开更多
关键词 Mixing of banking and commerce Holding equity stakes in financial institutions MOTIVATIONS Economic consequences
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基于动态加权选举的委托权益证明共识机制改进
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作者 杨攀 苏波 +3 位作者 刘敏贤 叶传涛 胡谊玲 张伟 《计算机系统应用》 2024年第1期272-279,共8页
面向委托权益证明共识机制中用户节点缺乏积极性、节点窜谋、难以抑制恶意节点出现、中心化风险变高等缺陷,提出了一种基于动态加权选举的委托权益证明共识机制改进方案.首先,针对用户节点建立奖惩机制以激励用户参与选举活动,同时引入... 面向委托权益证明共识机制中用户节点缺乏积极性、节点窜谋、难以抑制恶意节点出现、中心化风险变高等缺陷,提出了一种基于动态加权选举的委托权益证明共识机制改进方案.首先,针对用户节点建立奖惩机制以激励用户参与选举活动,同时引入用户节点地址聚类算法以发现具有相似投票行为的用户节点,限制用户节点的不良投票行为.使用改进熵权法对每一轮候选节点的特征动态计算权值,再利用优劣解距离算法结合用户节点的投票情况对候选节点进行排序,使选举结果更为合理.随后,在区块生产过程中动态调整生产节点的生产顺序以避免中心化风险.最终通过仿真模拟验证了所提改进方案的可行性与有效性,结果表明,所提方案能在激励用户节点的同时限制节点的不良行为,有效降低恶意节点出现的概率并避免中心化风险. 展开更多
关键词 区块链 委托权益证明 共识机制 动态加权选举
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基于混合信任模型的DPoS共识机制改进研究
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作者 叶飞 蒋凌云 《软件导刊》 2024年第4期141-149,共9页
针对“端—边—云”架构中“局部可信,全局不可信”的混合信任模型,提出基于混合信任的共识方案RT-DPoS。首先,设计声誉机制规范节点的行为并增强节点的投票积极性;然后,提出基于局部信任的投票策略指导节点的投票行为,并根据投票行为... 针对“端—边—云”架构中“局部可信,全局不可信”的混合信任模型,提出基于混合信任的共识方案RT-DPoS。首先,设计声誉机制规范节点的行为并增强节点的投票积极性;然后,提出基于局部信任的投票策略指导节点的投票行为,并根据投票行为建立局部信任关系,在此基础上,综合考虑节点的信任关系和声誉值,设计了两阶段的策略选出代理节点集合,增强了代理节点的去中心化;再在共识过程中引入可验证随机函数优化代理节点出块顺序,增强对腐败攻击的抵抗力。实验表明,RT-DPoS可以避免节点盲目投票,保证代理节点的可靠性和去中心化,并增强共识过程中的安全性,相较于DPoS,RT-DPoS提升了23.38%的安全性能。 展开更多
关键词 委托权益证明 混合信任 局部信任 声誉机制 边缘区块链
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混合型订单式人才培养模式下的利益博弈失序及其深层动因——基于N技工院校的多案例研究
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作者 余晖 闫赵凌云 《华南师范大学学报(社会科学版)》 北大核心 2024年第2期69-84,206,共17页
在高质量发展背景下,校企协同育人的难点之一是订单式人才培养中多元利益诉求的有效协调。基于多案例研究法对N技工院校中6个校企合作育人专业(共18个订单班)的实证分析显示,订单式人才培养呈现混合化发展趋势,并呈现出“五阶段四主体... 在高质量发展背景下,校企协同育人的难点之一是订单式人才培养中多元利益诉求的有效协调。基于多案例研究法对N技工院校中6个校企合作育人专业(共18个订单班)的实证分析显示,订单式人才培养呈现混合化发展趋势,并呈现出“五阶段四主体”的模式特征。该培养模式下的核心利益主体包括技工院校、订单班教师、用人单位和订单班学生,其利益冲突与博弈的交叠影响催生出校—企、校—生、校—师、企—生、企—师、师—生等博弈失序问题,影响人才培养质量及效益。引发博弈失序的深层动因包括制度层面的宏观和微观制度功能缺失与执行失效,法律层面的校企合作订单式育人地位模糊,以及文化层面的就业导向观、利益本位观与个人本位观冲突。为协调多元利益诉求、推动各主体实现良性博弈,应从制度建设与文化整合两个层面入手,围绕“准备阶段—班级组建—班级授课—最终考核—实习就业”的人才培养全链条实现机制优化。 展开更多
关键词 中职教育 技工院校 订单式人才培养 培养模式 利益相关者
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区块链共识算法研究综述
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作者 易黎 卢新宇 +2 位作者 汤鲲 王恒 龚子怡 《电子设计工程》 2024年第6期161-170,共10页
区块链已广泛应用于货币金融、通信网络、信息安全、物联网、电力运行管理和社会职能管理等多个领域,但依然存在许多急需解决的问题。共识算法是区块链的核心技术之一,是区块链各节点达成一致性最为重要的底层技术,是解决区块链吞吐量... 区块链已广泛应用于货币金融、通信网络、信息安全、物联网、电力运行管理和社会职能管理等多个领域,但依然存在许多急需解决的问题。共识算法是区块链的核心技术之一,是区块链各节点达成一致性最为重要的底层技术,是解决区块链吞吐量太小、通信存在延迟等一系列问题的关键技术,是区块链安全运行的重要保证。文中基于区块链共识算法的设计原理,主要介绍了区块链的构成、分类、架构、上链、节点处理流程及存在的问题,重点阐述了现有PoW、PoS、DPoS、PBFT、Raft、Paxos、Ripple等共识算法设计思路、共识理论及流程,对共识算法中的共性问题,即算法优化、算法效果进行了综合概述和分析,并对区块链共识算法研究进行了展望,希望开发出更加高效、安全的共识算法。 展开更多
关键词 区块链 共识算法 工作量证明 权益证明 拜占庭容错
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基于多源数据融合的高速公路桩号数字化研究及应用
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作者 林杰 万里 +3 位作者 陈军 阳汉 黄傲 谢俊 《武汉理工大学学报(信息与管理工程版)》 CAS 2024年第2期324-328,334,共6页
目前高速公路上普遍存在着设计、施工、运营等资料交接不全或分段设计施工的问题,交通行业相关运营管理部门急需一种能安全、快速、准确地调研桩号现状的方法及相关软硬件装备。基于多源数据融合算法,采用全球卫星定位系统(GNSS)、光电... 目前高速公路上普遍存在着设计、施工、运营等资料交接不全或分段设计施工的问题,交通行业相关运营管理部门急需一种能安全、快速、准确地调研桩号现状的方法及相关软硬件装备。基于多源数据融合算法,采用全球卫星定位系统(GNSS)、光电编码器(DMI)、图像识别数据融合的方法,建立了桩号测量及数据校核模型,应用人工智能深度学习对公里桩/百米桩智能提取算法。结果表明:对比人工徒步GNSS打点、车载人工GNSS打点等传统方法,所提方法能有效提升桩号测量效率,通过对道路环境图像和GNSS进行时空同步,将每个公里桩作为校正点,确保每个公里桩之间的误差不进行累积,定位误差不超过5 m。研究成果数据已服务于湖北交投运营集团的智慧养护管理系统底层数据库,为后期高速公路养护设计、检测、施工、信息化等提供了精准数据支撑。 展开更多
关键词 高速公路桩号 光电编码器 多源数据融合 时空同步 人工智能
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An Analysis of Private Placement, Nature of Controlling Stake and Industrial Upgrading Effect
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作者 YAN Wu LI Jia LIU Binbin 《当代财经》 CSSCI 北大核心 2015年第S1期77-91,共15页
This paper aims to discuss and analyze the distribution characteristics of the private placement among different regions and different industries by state-owned and private holding enterprises as well as the changed e... This paper aims to discuss and analyze the distribution characteristics of the private placement among different regions and different industries by state-owned and private holding enterprises as well as the changed earning capacities of the capital before and after the placement. Taking the private placement financing data of the listed companies during the period of 2006-2011 in China's A-share markets as the sample, this study adopts the panel data model to conduct a quantitative analysis of the industrial upgrading effect of the private placement by listed companies with different holding natures. The empirical results show that though the private placement by the state-owned and private holding enterprises has not significantly improved the Clark index in any region, the private placement by private holding companies has significantly improved the growth rate of the tertiary industry in the eastern region. While reducing the proportion of the tertiary industry in GDP in the central and western regions, it has also improved the growth rate of the secondary industry and its proportion in GDP in that region to a larger extent. Yet the private placement of state-owned enterprises has no significant effect on the industrial upgrading path in any region except that it helped to raise the proportion of the secondary industry in GDP a little in the eastern region. 展开更多
关键词 PRIVATE PLACEMENT NATURE of controlling stake INDUSTRIAL UPGRADING effect.
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ISSUES AT STAKE
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作者 ESTELLA ZHOU 《Beijing Review》 2008年第3期12-13,共2页
As China becomes the largest source of U.S.imports and its third largest export market,both countries will
关键词 In SED ISSUES AT stake AT
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Rising Stakes
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作者 YAN WEI 《Beijing Review》 2007年第10期12-13,共2页
With Tehran clinging to its hard-line policy, experts are extremely cautious about the future of the Iranian nuclear issue Recent moves have once again high- lighted the complexity of the Iranian nuclear issue. In a m... With Tehran clinging to its hard-line policy, experts are extremely cautious about the future of the Iranian nuclear issue Recent moves have once again high- lighted the complexity of the Iranian nuclear issue. In a meeting in London on February 26, 展开更多
关键词 In Rising stakes SECURITY
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