砂土的振动液化及防治工程措施

文章简要叙述了砂土振动液化的基本概念,分析了砂土液化的机理和影响因素。在此基础上提出了几点可行性抗土体液化的工程措施。     

粘性土剪切波速的现场和室内试验研究

利用安装在动三轴仪上的剪切波速测试装置,测试了天津地区粘土的剪切波速。并在此基础上将室内测试结果与现场测试值进行了比较。研究发现二者的差值最大不超过13％,并与土样埋深有直接关系。     

某钢厂地基液化的Bayes判别分析

将Bayes判别法应用到砂土液化的预测问题中,建立了砂土液化的线性判别函数。考虑了实际标准贯入击数、标准试验深度、粘粒含量三个指标,利用某钢厂某大型技术改造工程地基的20组参数作为判别函数的训练样本,并对剩下的71组参数进行了评判,评判效果较好,表明此判别方法用来判别地基土的液化是准确、可行的。     

综合评价场地液化等级的基本原则

针对场地不同钻孔液化指数呈现多等级,而规范对场地综合评价介绍比较模糊,且无统一或相应具体分类方法的情况,提出着重考虑场地地层地貌和工程重要性等因素进行综合确定场地液化等级的评价方法,并列举了一些基本的综合评价方法.     

浅谈强夯工艺在吹填砂地层中的应用

本文结合工程实例，验证了吹填砂层进行强夯施工工艺消除砂土层液化性可行性。同时指出施工中的一些个人体会，以供同行参考。     

浅述粉(砂)土的液化判别和工程加固处理

尽管国内外在处理可液化地基的理论和实践上取得了可喜的成果,但尚存在着一些模糊问题急待研究,如砂土液化层液化势的科学判定、液化处理范围的确定、振冲法填料设计、施工质量实时监控等.     

动力机器弹性地基的动力学分析

土动力学是研究地震、波浪及机器基础等动荷载作用下土体的动变形、动强度以及稳定的一门学科。其主要研究内容可以概括为土的动力特性,土的动力反应与稳定以及土与土体的动力测试技术三个方面。海洋钻井平台,大坝,地震中的房屋等,其地基土均受到循环荷载作用,为了防止其受力破坏,必须对其地基土的动力特性进行试验研究。动弹性模量E和动剪切模量G是表征土的动力变形特性的重要参数,其主要影响因素有:土体初始应力状态、土体本身性质、动力荷载性质等。因此,通过试验模拟实际环境,研究其变化特点及特征是很有必要的。土动力学的逐渐深入研究,离不开不断发展的试验设备。室内测试技术包括动三轴仪、动扭剪仪、共振柱、共振台、离心模型试验等。原位测试技术包括剪切波速测试、弯曲元法、动力旁压试验等。     

液化石油气中二甲醚检测方法研究进展

文章对二甲醚的性质、钢瓶腐蚀性以及液化石油气中二甲醚检测方法进行研究与展望,为液化石油气中二甲醚检测方法拓展进一步奠定了基础。     

论液化天然气零售价格的制定

目前,许多国家都将液化天然气作为首选燃料,液化天然气在我国能源供应中所占的比例也在迅速增加。本文论述了液化天然气零售价格的定价原则,并在此基础上提出了制定液化天然气零售价格的方法,以助于液化天然气零售市场更加健康快速的发展。     

新型钾盐聚合物钻井液技术应用分析

通过优选一种新型钾盐聚合物钻井液体系配方,并在室内进行了抑制性、抗温性和流变性能评价,实验证明这种新型钾盐能够代替氯化钾。2010年新型钾盐聚合物钻井液体系在伊朗雅达油田F2井岩盐、石膏层地层进行了应用,现场应用表明,该体系具有抑制性强、流变性良好、表面张力低等优点,能够满足易造浆地层及岩盐、石膏层地层的钻探施工。F2井上成功实施试油作业后,日产原油达711.1m3;F2井丰富的油气储藏和极好的试油结果,为中石化在伊朗雅达区块的勘探开发提供了有力的技术支持。     

生物质热裂解液化技术的发展概况

生物质能转换利用技术包括直接燃烧技术、热化学转化技术和生化转化技术.生物质热化学转化技术具有效率高、成本低的优势,备受各国关注,而热裂解液化技术又是研究中的重中之重,是目前生物质能源发展领域中的前沿技术之一.目前,生物质热裂解液化技术在美国、加拿大等国的研究开发居世界领先地位,而我国在这方面的研究起步较晚,没有商业化生产和应用.由于生物质资源具有可再生性,其必将取代原有的矿物能源,因此生物质热裂解液化技术具有广阔的发展应用前景.     

Banking Reforms for the 21st Century: A Perfectly Stable Banking System Based on Financial Innovations*

Although bank loans themselves are somewhat illiquid because of private information, most of their cashflows are not. Recent financial innovations allow commercial loans to be liquefied via credit derivatives and actual and synthetic securitizations. The loan originating bank holds the remaining illiquid equity tranche containing the concentrated credit risk, private information rent and the ‘excess spread’ that incentivize the bank to continue to monitor and service the loans. Empirically, we find that the average size of the equity tranche is about 3% for the representative commercial loan portfolios in our sample. The liquefaction of bank loans makes possible a banking system that restricts the guaranteed accounts to be backed by 100% reserves and the non‐guaranteed deposits to be backed by liquid securitized loan tranches, while retaining the deposit‐lending synergy. Such a system is perfectly safe without deposit insurance and it renders banks bankruptcy‐remote without sacrificing a bank's traditional role as a financial intermediary.     

多站制CW雷达目标动态模拟器设计

针对多站制连续波（CW）雷达工作特点,设计了一种CW雷达目标动态模拟器,满足多站连续 波测 量系统动态模拟联试的需求。采用高性能CPCI工控机作为模拟器硬件平台,信号处理单元 以CPCI板卡为载体,模拟控制信息依据弹道数据生成。模拟器通过控制测距信号的时间延迟 ,实现目标距离变化的模拟;通过载波频移控制,实现目标速度的模拟;通过数控衰减器控 制模拟信号的幅度,实现目标信号强弱的模拟。通过多站制测量系统动态模拟联试,验证了 模拟器的有效性和距离与速度的相关性。     

三频段准连续波雷达信号目标检测性能分析

准连续波雷达是一种低截获概率雷达,结合了脉冲雷达收发隔离和连续波雷达截获概率低的优点,但其检测性能的优劣很大程度依赖于信号形式,普通的编码信号和线性调频信号已经不能满足其对目标探测的要求。为解决这个问题,设计了一种三频段信号和与之相应的收发系统,对系统结构及三频段信号的参数选择原则、目标检测原理、模糊函数、抗近距离盲区性能做了详细分析,并指出了三频段信号相对于相位编码信号和分时发射信号的优势所在,最后通过仿真证明,将三频段信号应用于准连续波体制雷达中时能准确探测目标,得到目标的各个参数并且能有效消除近距离盲区。     

紫薯饮料护色液化工艺

本研究以紫薯为原料制备紫薯饮料,确定紫薯饮料的护色工艺和液化工艺。得到最优护色工艺为:将紫薯片放入浓度0.5%的复合护色剂(Vc∶柠檬酸=3∶2)中,20℃下护色10 min;加2倍水打浆新鲜甘薯在70℃下,添加0.4%的α-淀粉酶液化60 min。此工艺条件下制作的紫薯饮料口感良好、营养丰富。     

毫米波波导成型技术

用活动模芯代替钢带是毫米波波导弯曲成型的有效方法,该工艺的关键是模芯的设计与制造。采用活动模芯弯曲毫米波波导,重点讨论了模芯尺寸、模芯形状和回跳角对波导尺寸和表面粗糙度的影响,并对该工艺制备的样品进行了测定。结果表明:当模芯尺寸与波导内腔实际尺寸差值在0~0.02 mm,不同的弯曲半径和弯曲角度给予不同的回跳角预设值,可以制造出满足设计要求的弯波导。     

What (de) motivates customers to use AI-powered conversational agents for shopping? The extended behavioral reasoning perspective

Artificial Intelligence (AI)-powered conversational agents have become ubiquitous tools in the digital transformation of conventional customer-company interactions. Despite the widespread implementation of Artificial Intelligence (AI)-powered conversational agents, there is still a limited understanding of how customers use and resist these technologies for shopping. To address this gap, this study investigates factors that influence the usage and resistance of AI-based conversational agents for shopping using the extended behavioral reasoning theory (BRT) and partial least squares-based structural equation modeling (PLS-SEM). To test the proposed framework, this study conducted two empirical studies in South Korea. Study 1 focused on text-based chatbots with a sample of 232 participants, while Study 2 examined voice-based chatbots with a sample of 234 participants. The results of the both studies mainly supported the hypotheses driven by the extended BRT. Theoretically, this study contributes by offering a comprehensive understanding of customer motivation, attitudes, and behavioral intentions toward the use of AI-powered conversational agents in shopping. Managerially, this study provides important insights for retail managers and developers of AI-powered conversational agents for shopping. By understanding the factors that drive customer usage and resistance, managers, and developers can better design and deploy these innovative technologies to enhance the customer experience and improve business outcomes.     

Acceptance and use of big data techniques in services companies

Companies able to take advantage of the information coming from the use of Big Data will have a competitive advantage by being able to make decisions based on greater knowledge of customers and competition. Besides, the access to the software for the treatment of this great amount of data is free. So, the objective of this paper is to study the level of acceptance and use of these technologies, Big Data techniques, by services companies. To analyse the intention and use it extends the acceptance technologies model- Unified Theory of Acceptance and Use of Technology (UTAUT) - to the context of Big Data techniques, incorporating the effect on it of three new variables: resistance to use, perceived risk and opportunity cost. The structural model was evaluated using partial least squares structural equation modelling (PLS-SEM) with an adequate global fit. The verification is carried out with a sample of 199 Spanish services companies, and its main results are the strong effect of the facilitating conditions on the intention and use of Big Data, as well as the direct effect of the opportunity cost and the resistance to use on the intention, and the indirect inhibiting effect of the perceived risk through the resistance to use on intention behaviour.     

毫米波矩形波导空心扭转工艺技术

通过对毫米波矩形波导扭转成型仿真与主要工艺参数的理论分析，确定了毫米波矩形波导空心扭转工艺流程。对利用该项工艺成型的波导电性能进行了测试，并对实测结果进行了分析与讨论。