Rcscarch on Small-Scale Solar Magnetic Fields and Activities

It has been known that there are different kinds of small-scale active phenomena on the Sun. They are classified into spicules, macrospicules, and H-alpha jets, X-ray jets, etc., according to their sizes, velocities, lifetimes, and so on. All these phenomena are related to small-scale magnetic fields. The problems of solar upper atmospheric heating and solar wind acceleration have never been solved. Small-scale magnetic fields and activities are considered to play key roles in heating upper atmosphere and in accelerating solar wind.     

外躲内防抗核辐射

最近,读者纷纷来信询问防核辐射的知识,许多读者希望了解盐为什么能够一定程度上防辐射。下面就给大家介绍一下如何抵抗核辐射,希望读者能够喜欢。前一段时间,由于惧怕日本核电站泄漏后飘洋过海的核辐射污染,中国各地掀起了一股抢盐狂潮。虽然这是无知闹出来     

专家解析核辐射

1、什么是核辐射？ 核是原子核的简称,辐射是能量传播的一种形式。有些辐射也叫射线,是运动着的粒子或光（量）子,例如常见的X射线,通常叫X线,或x光,是x射线机工作时发出来的一种辐射。它可以穿透我们的身体或钢铁部件,留下影像;它还可以使空气“电离”,生成负离子和正离子。     

某转包铸件X射线检测灵敏度的提高

本文通过对影响某转包铸件X射线检测灵敏度的技术因素和非技术因素的分析,找到了影响其灵敏度不能达到要求的主要原因,并以此采取了改进措施,使得此转包铸件的X射线检测灵敏度很容易地就能达到要求,提高了此转包铸件的X射线检测灵敏度。     

无损检测工艺规程的编制探讨

阐述了无损检测工艺的流程,详细介绍了规范的焊接接头射线检测工艺卡及焊接接头超声波检测工艺卡,并就如何更好地编制无损检测工艺规程,使之能真正用于实际检测并提出解决办法。     

Synthesis of polyketone by copolymerization of styrene and CO using carbon nanotube-complex Pd2+ catalyst

The dipping method was devised to deposit Pd onto carbon nanotube as supported catalyst(Pd/CNT) for the copolymerization of carbon monoxide(CO) and styrene(ST) towards the formation of polyketone(PK).The Pd/CNT was characterized by X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD) and high-resolution transmission electron microscopy(HRTEM).The construction and crystallization property of PK were evaluated by Fourier transform infrared spectroscopy(FTIR),13C-nuclear magnetic resonance(NMR) and XRD,respectively.The catalyst showed excellent activity and reusability in promoting the fabrication of PK.It can be recycled 14 times with the highest total catalytic activity of 4 239.64 gPK/(gPd·h) at Pd content of 8.63wt%.The results indicate that the prepared catalyst is effective to catalyze the copolymerization of CO and styrene.     

加快落实京津冀档案事业协同发展合作框架协议

正近半年来,京津冀三地档案部门认真贯彻习近平总书记关于京津冀协同发展的重要战略思想,结合各地区工作实际,加强沟通合作、协同发展,在诸多方面达成共识。本期"特别关注"栏目推出《京津冀档案部门携手合作共谋发展》一文,刊载了参加签署档案事业协同发展合作框架协议的国家档案局局长杨冬权的贺词和北京市档案局(馆)局(馆)长吕和顺、天津市档案局(馆)局(馆)长方昀、河北省档案局(馆)局(馆)长魏四海的重要讲话。三地档案局(馆)的领导共谋发展,分别就诸多方面的合作交流了意见,创新性的工作机制令人振奋,对三地档案部门加强合作、协同发展的美好前景充满了信心。     

Origin of ＂cosmic fireworks＂ further demystified

Teaming up with colleagues from Europe, Japan, and US, Dr. DENG Jinsong from the National Astronomical Ob- servatories at CAS (NAOC) has made fresh progress in revealing the mechanism behind the origin of the long-duration gamma-ray bursts (GRBs), which a…     

Blazar天体的低频射电辐射研究

用2个大的Blazar样本,研究了射电5GHz、8·4GHz辐射与γ射线辐射流量最大值、最小值以及平均值之间的相关·结果表明:射电5GHz、8·4GHz辐射与γ射线辐射在低态(最小值)时都没有相关;在高态(最大值)和平均态时都有较好的线性相关,置信度均好于10-4;射电辐射频率越高,其与γ射线辐射的相关性就越好·因此,Blazar的γ射线辐射与低频射电辐射确有关联,γ射线的辐射应来自同步自康普顿辐射过程·