"日本军国主义已经复活"问题探析

日本在佐藤荣作执政末期,垄断资本膨胀,海外经济扩张加剧,军事力量加强,日美军事同盟巩固,并顽固坚持反共反华立场,中国据此曾一度提出"日本军国主义已经复活"的论断.这一论断虽然未必完全符合实际情况,但它对于警惕和防止日本军国主义复活,推进中日邦交正常化的实现所起的作用,仍是应该肯定的.     

高中学业水平合格性考试命题难度控制技术的探究——以信息技术学科为例

高中信息技术学业水平合格性考试作为标准参照性考试,命题过程需要按照考试目标及要求做好难度控制,通过准确预估试题难度控制试卷难度,实现考试结果与考试目标的一致。命题难度控制技术包括试题的难度预估、试卷难度的控制。通过确定影响难度的主要客观因素、设计简便易行的试题难度计算方法、建立试题难度预估的参照模型等三个环节探究试题难度预估的方法,结合实例进一步探究试卷难度的控制技术。     

Is right ventricular mid-septal pacing superior to apical pacing in patients with high degree atrio-ventricular block and moderately depressed left ventricular function?

Objective

We are aimed to investigate whether right ventricular mid-septal pacing (RVMSP) is superior to conventional right ventricular apical pacing (RVAP) in improving clinical functional capacity and left ventricular ejection fraction (LVEF) for patients with high-degree atrio-ventricular block and moderately depressed left ventricle (LV) function.

Methods

Ninety-two patients with high-degree atrio-ventricular block and moderately reduced LVEF (ranging from 35% to 50%) were randomly allocated to RVMSP (n=45) and RVAP (n=47). New York Heart Association (NYHA) functional class, echocardiographic LVEF, and distance during a 6-min walk test (6MWT) were determined at 18 months after pacemaker implantation. Serum levels of N-terminal pro-brain natriuretic peptide (NT-proBNP) were measured using an enzyme-linked immunosorbent assay (ELISA) kit.

Results

Compared with baseline, NYHA functional class remained unchanged at 18 months, distance during 6MWT (485 m vs. 517 m) and LVEF (36.7% vs. 41.8%) were increased, but BNP levels were reduced (2352 pg/ml vs. 710 pg/ml) in the RVMSP group compared with those in the RVAP group, especially in patients with LVEF 35%–40% (for all comparisons, P<0.05). However, clinical function capacity and LV function measurements were not significantly changed in patients with RVAP, despite the pacing measurements being similar in both groups, such as R-wave amplitude and capture threshold.

Conclusions

RVMSP provides a better clinical utility, compared with RVAP, in patients with high-degree atrioventricular block and moderately depressed LV function whose LVEF levels ranged from 35% to 40%.     

固相萃取-气相色谱质谱法测定水中七氯

实验采用固相萃取-气相色谱质谱法对水样的七氯进行分析,优化前处理条件及气相色谱质谱条件,方法最低检测质量浓度可达0.00005mg/L,标准曲线的线性相关系数r2=0.998线性范围为0.0002～0.01mg/L,样品平均加标回收率在101.7%～112.4%之间,相对标准偏差在1.81%～5.15%。该方法操作简单、灵敏度高、准确、重现性好。     

爱心感化 信心激励 耐心指导——用“三心”做好高校留级生转化工作的体会

随着高校扩招,留级生所占的比例不断上升,如何有效地做好留级生的转化工作,已是摆在全体学生工作者面前的一个全新课题。作者根据自己的工作体会,用爱心、信心和耐心做好高校留级生转化工作,取得了一定的成效。     

服务大局 加强基础 扶持青年——中国科学学与科技政策研究会第三届理事会工作报告

--编者注中国科学学与科技政策研究会第三届理事会是在1997年1月组成的，至今已有四年，任期届满。现受理事会的委托，向大会作工作报告。四年来，我会在中国科协和民政部的领导下，高举邓小平建设中国特色社会主义理论的伟大旗帜，紧跟党中央的伟大战略部署，积极贯彻党的各项方针政策，大力发挥研究会学术性群众团体的作用，组织广大会员，为实施科教兴国战略和可持续发展战略，为实现经济体制和经济增长方式的根本转变，为“两个文明”建设，多做贡献。我们积极开展课题研究，组织学术交流活动，编辑出版学术性书刊，举办学术报告会、研讨会和培训班，同国际上科学学研究组织进行联系与合作，建立健全研究会组织，在科学学的学科建设方面，以及为政府有关部门提供决策参考意见等方面，做了大量的工作，取得了显著的成绩。中国科学学事业已经出现了一个新的局面，进入了一个新的发展阶段。 1 历史的回顾 在千年交汇之际，满怀信心地总结我们的工作时，我们不应该忘记过去。因为，今天的成绩是在前人基础上完成的，而未来又会从我们的基础上向前迈进，取得新的发展。回顾、反思和总结过去，吸取前人的经验教训，对于今后的事业是会有很大好处的。“科学学”实际上也就是这样一门对人类有史以来的科学进行回顾、反思和总结的科学。 科学学从它的萌芽到今天的繁荣，大约已有近百年的历史了。回顾它那风风雨雨的发展历程，我们可以看到，它大体经过了萌芽、形成、发展和繁荣四个阶段。 本世纪初至20年代，是科学学的萌芽阶段。     

涉密信息离线浏览系统的设计与实现

信息安全是信息时代的首要任务。一些科技生产企业往往碰到需将涉密信息带到用户现场进行离线浏览的问题,确保数据安全显得至关重要。离线浏览需要依靠技术手段对数据进行信息安全处理,椭圆典线密码机制（ECC）属于非对称的公钥密码机制,基于椭圆曲线离散对数计算问题的数学困难,是目前优秀的加密算法,具有单比特强度高,密钥短的优点,简述了椭圆曲线密码机制的基本原理与加解密过程,伪随机序列是一种对称密码,由序列生成器逐比特生成,具有良好的随机性。本文结合椭圆曲线密码机制与伪随机序列机制二者的技术优势与特点,对离线的涉密信息浏览进行强化加密,描述了离线浏览系统的总体结构与功能,并在windows平台下实现。     

Understanding the topic evolution of scientific literatures like an evolving city: Using Google Word2Vec model and spatial autocorrelation analysis

Topic evolution has been described by many approaches from a macro level to a detail level, by extracting topic dynamics from text in literature and other media types. However, why the evolution happens is less studied. In this paper, we focus on whether and how the keyword semantics can invoke or affect the topic evolution. We assume that the semantic relatedness among the keywords can affect topic popularity during literature surveying and citing process, thus invoking evolution. However, the assumption is needed to be confirmed in an approach that fully considers the semantic interactions among topics. Traditional topic evolution analyses in scientometric domains cannot provide such support because of using limited semantic meanings. To address this problem, we apply the Google Word2Vec, a deep learning language model, to enhance the keywords with more complete semantic information. We further develop the semantic space as an urban geographic space. We analyze the topic evolution geographically using the measures of spatial autocorrelation, as if keywords are the changing lands in an evolving city. The keyword citations (keyword citation counts one when the paper containing this keyword obtains a citation) are used as an indicator of keyword popularity. Using the bibliographical datasets of the geographical natural hazard field, experimental results demonstrate that in some local areas, the popularity of keywords is affecting that of the surrounding keywords. However, there are no significant impacts on the evolution of all keywords. The spatial autocorrelation analysis identifies the interaction patterns (including High-High leading, High-Low suppressing) among the keywords in local areas. This approach can be regarded as an analyzing framework borrowed from geospatial modeling. Moreover, the prediction results in local areas are demonstrated to be more accurate if considering the spatial autocorrelations.     

新型研发机构促进理工类高校科技成果转化的路径分析

针对理工类高校科技成果转化的现状,从新型研发机构的视域出发,从高校响应科技成果转化政策的解释框架、产学研深度融合的技术创新体系、高校科技成果产业化价值链等方面的探究,对新型研发机构促进科技成果转化的特色发展模式进行分析,提出有助于推动理工类高校科技成果转化的对策建议.     

Surface superconductivity in the type II Weyl semimetal TaIrTe4

The search for unconventional superconductivity in Weyl semimetal materials is currently an exciting pursuit, since such superconducting phases could potentially be topologically non-trivial and host exotic Majorana modes. The layered material TaIrTe₄ is a newly predicted time-reversal invariant type II Weyl semimetal with the minimum number of Weyl points. Here, we report the discovery of surface superconductivity in Weyl semimetal TaIrTe₄. Our scanning tunneling microscopy/spectroscopy (STM/STS) visualizes Fermi arc surface states of TaIrTe₄ that are consistent with the previous angle-resolved photoemission spectroscopy results. By a systematic study based on STS at ultralow temperature, we observe uniform superconducting gaps on the sample surface. The superconductivity is further confirmed by electrical transport measurements at ultralow temperature, with an onset transition temperature (T_c) up to 1.54 K being observed. The normalized upper critical field h*(T/T_c) behavior and the stability of the superconductivity against the ferromagnet indicate that the discovered superconductivity is unconventional with the p-wave pairing. The systematic STS, and thickness- and angular-dependent transport measurements reveal that the detected superconductivity is quasi-1D and occurs in the surface states. The discovery of the surface superconductivity in TaIrTe₄ provides a new novel platform to explore topological superconductivity and Majorana modes.