低分子肝素与阿斯匹林治疗不稳定心绞痛疗效对比观察

目的探讨低分子肝素治疗不稳定型心绞痛(UAP)的疗效及安全性。方法将116例UAP患者随机单盲分为对照组(常规治疗)和治疗组(常规治疗 低分子肝素)分别为58例。结果4周后总有效率:治疗组为91.38%,对照组为68.97%(P<0.05);观察4周治疗组无1例发生心肌梗死,无1例死亡;对照组发生心肌梗死5例(占8.62%),死亡4例。治疗组未发生明显不良反应。结论在常规抗凝治疗基础上加用低分子肝素能更有效的控制并预防心绞痛发作频率,并能减低心肌梗死的发生率。     

《今日说法》中的态度研究：一种评价视角

在马丁评价系统理论指导下,从三个子系统的角度对《今日说法》节目的分析表明,该理论具有强大的实用性与可操作性。     

化学虚拟实验室建设的探究

运用虚拟现实技术建立化学虚拟实验室,对于进行工业设计,虚拟实验、虚拟制造,有效提高教学效果,提升教学过程中的科技含量,起着重要的作用,应着力建设和加强这方面的工作,本文介绍了化学虚拟实验室的基本概念及化学虚拟实验室建设的基本参数,提出了建设化学虚拟实验室的对于教学工作的必要性。     

Athanasius Kircher’s magical instruments: an essay on ‘science’, ‘religion’ and applied metaphysics

In this paper I endeavour to bridge the gap between the history of material culture and the history of ideas. I do this by focussing on the intersection between metaphysics and technology—what I call ‘applied metaphysics’—in the oeuvre of the Jesuit scholar Athanasius Kircher. By scrutinising the interplay between texts, objects and images in Kircher’s work, it becomes possible to describe the multiplicity of meanings related to his artefacts. I unearth as yet overlooked metaphysical and religious meanings of the camera obscura, for instance, as well as of various other optical and magnetic devices. Today, instruments and artefacts are almost exclusively seen in the light of a narrow economic and technical concept. Historically, the ‘use’ of artefacts is much more diverse, however, and I argue that it is time to historicize the concept of ‘utility’.     

太阳能转化为氢能之探讨

介绍了新能源、太阳能、氢能,以及太阳能光热利用的低温、中温、高温利用.简述了几种常用的太阳能制氢工艺技术.详细阐述了Zn/ZnO氧化还原反应的太阳能光热化学循环制氢原理和两步法循环制氢的工艺流程.该技术为低成本高效率利用太阳能制氢的新途径,可供业内参考.     

A Survey of MRI-Based Brain Tumor Segmentation Methods

Brain tumor segmentation aims to separate the different tumor tissues such as active cells, necrotic core,and edema from normal brain tissues of White Matter（WM）, Gray Matter（GM）, and Cerebrospinal Fluid（CSF）. MRIbased brain tumor segmentation studies are attracting more and more attention in recent years due to non-invasive imaging and good soft tissue contrast of Magnetic Resonance Imaging（MRI） images. With the development of almost two decades, the innovative approaches applying computer-aided techniques for segmenting brain tumor are becoming more and more mature and coming closer to routine clinical applications. The purpose of this paper is to provide a comprehensive overview for MRI-based brain tumor segmentation methods. Firstly, a brief introduction to brain tumors and imaging modalities of brain tumors is given. Then, the preprocessing operations and the state of the art methods of MRI-based brain tumor segmentation are introduced. Moreover, the evaluation and validation of the results of MRI-based brain tumor segmentation are discussed. Finally, an objective assessment is presented and future developments and trends are addressed for MRI-based brain tumor segmentation methods.     

南沙诸岛的法律地位

根据《联合国海洋法公约》第121条的规定,岛屿可以享有与大陆同等的海域范围,而不具备社会经济属性的岩礁则不能拥有专属经济区和大陆架。南沙群岛的归属争议归根结底来自对其岛礁周围海域自然资源的争夺,因此明确南沙诸岛的法律地位是解决主权争端的关键。在运用国际法基本原理,并结合各岛礁的地理信息以及经济价值加以系统分析中,对南沙诸岛的法律地位进行明确,以期在实践中为维护中国在南海的海洋权益提供理论依据。     

玻纤拉丝空调冷冻水温度分析

玻纤行业为稳定拉丝作业,基本上采用制冷机、拉丝空调所组成的送风系统,以保证拉丝作业现场的工艺风温度和环境风温度达到合理要求。我公司实际生产过程中冷冻水温度基本达标,但空调所供给的送风温度却达不到设计要求,本文以制冷机冷冻水系统及空调机组为重点,分析冷冻水温度高的主要影响因素,并提出相应措施进行解决,对其它玻纤企业相关问题的处理具有借鉴意义。     

低密度CH泡沫微柱微细车削加工工艺研究

低密度多孔泡沫材料在高能密度物理、辐射运输、绝热成型研究中有重要应用,但该材料多孔易碎,加工难度大.在尖刃金刚石外圆刀具和尖刃金刚石切断刀具设计的基础上,利用精密车削微加工方法制备了激光惯性约束聚变(ICF)所需的各类低密度CH泡沫微柱,并详细讨论了切削加工条件、加工刀具集合参数、切断刀具几何参数、加工参数等对CH泡沫微柱车削加工的影响.     

光、水、群体性等因素对台湾乳白蚁生存力的影响

通过改变台湾乳白蚁的生存条件,研究多种因素对台湾乳白蚁工蚁生存力的影响.实验结果表明光照对工蚁生存力影响最大,可以使工蚁生存时间大大减少,水和食物也是影响工蚁生存力的关键因素.同时实验结果还表明,同等条件下台湾乳白蚁工蚁群体的大小对其生存力有一定的影响,群体越大,生存力越强.