毛主席语录

列宁为什么说对资产阶级专政,这个问题要搞清楚。这个问题不搞清楚,就会变修正主义。要使全国知道。 总而言之,中国属于社会主义国家。解放前跟资本主义差不多。现在还实行八级工资制,按劳分配,货币交换,这些跟旧社会没有多少差别。所不同的是所有制变更了。 我国现在实行的是商品制度,工资制度也不平等,有八级工资制,等等。这只能在无产阶级专政下加以限制。所以,林彪一类如上台,搞资本主义制度很容易。因此,要多看点马列主义的书。 列宁说,“小生产是经常地、每日每时地、自发地和大批地产生着资本主义和资产阶级的。”工人阶级一部分,党…     

1992年(第6卷)作者索引

.(4).(3).(4).(1)297。221。285。37。七划(杨、 辛、汪 .(l)芍、苏、李、吴、邹、沈、宋、张、陈)30。143。136。230。235。127。221。285。206。54。221。192。198。15。15。230。30,.(l)48,206,.(3)217,254,.(4)273,279。254。198。143。143。23。58。297。175。150。48。30,t(4)273,279。、刃夕、.,、,了﹄、产、声、产、,口、,口、.尹、,︸、产、,J、声‘,.、刀,‘、产心‘,‘,曰,口心山吸口月,自J曰.1,口,曰自j曰.二,二,口1‘了、了、Jr.、矛.、了、了.、了‘、工气矛.、矛.、矛叮、子‘,矛.、J‘、护.、了.、......…t ....t .....…     

西诗偶拾(摘选)

《希腊选本》选译柏拉图(Plato)共憩松荫下 ,相偕避尘嚣。西风拂高干 ,枝叶尽萧萧。流泉伴笛韵 ,悠悠烦襟消。倦矣睫低垂 ,美梦任逍遥。托勒密(Ptolemy)顾余本凡人 ,倏忽寄浮生。深霄观天象 ,星斗自纵横。恍若离尘寰 ,跻身造化邻。畅饮长生酒 ,欢悦润素心。卡里马瞿斯(Kallimachus)故人噩耗至 ,凄然泪盈眶。忆昔频聚首 ,高谈催日藏。挚友归尘土 ,遗篇存诗章。死亡吞万物 ,赖此令名彰。《柔巴依集》选译莪默·伽亚谟(OmarKhayyam)Ⅻ绿树浓荫一卷诗 ,卮酒炊饼醉莫辞。身畔卿复歌一曲 ,沙漠天堂正此时。XIII天地穹窿旧旅庐 ,昼夜交替犹门户…     

量子材料大观园(1)

浪淘沙·文心涨落无欲睹芳容,经典西东。北南风景枉玲珑。正看时光回转后,反演无穷。有意步萍踪,量子匆匆。对角一幕解三重。欲挽本征何处是,简并寒冬。Ⅰ.让声子来存储信息–热导回线在信息领域,热很大程度上是个坏小子。不过,也有时候,热导跟电导一样,是可以利用来存储信息的。与电输运比较,热输运毫无疑问比较慢、比较粗,且热量自由散漫惯了,难以驾驭,也是事实。     

学问、知识不是唾手可得

开放以来,改革声浪日高。原属意料中事。从长远看来对我国政治、经济、女化、学术等无疑会带来繁荣的前景。不过改革可能过快或失策,则难免产生一些意外。目前各机构变相裁减人员,即令人员“自食其力”,则属失策。另一方面,在人反本身切不可自馁。应该发奋自强,克服困难,终能得胜利。古语云:事在人为。在分析化学范围内的各分支,希望都有人搞,人数却不能一般多。目的在匡家、企业有需求时,不致临时找不到人,不致有缺门。因为学问、知识不是唾手面得,而要多年专心从事。学问、知识不是唾手可得     

我们为何仰望星空

<正>人静更初,月沉西去,小儿偷入庭中。举目巡天望,满院繁星。银汉斜横南北,河两岸、郎女难逢。东天上,英仙跨马,擎起苍鹰。极空,化出仙后,华冠紫金衣,护驾双熊。瞬而西南暗,将隐长庚。星月轮番登场,人亦是、十载河东。青云涌,天龙显鳞,四宇飞腾。这首《凤凰台上忆吹箫·望星空》是我数年前所填。从中也引出一个问题:我们为何仰望星空?我想,每个人都有着各自的答案。有人说:星空很神秘,我们仰望星空可以畅想未知的力量。有人说:从小就养成了看星星的习惯,看着满天星斗,     

最杰出的10位物理学家

 英国杂志《物理世界》在100位著名物理学家中选出的10位最伟大者:爱因斯坦,美籍德国物理学家。苏黎世大学哲学博士,英国皇家学会会员。建立相对论改变了世人的宇宙观。他因解释光电效应的理论,独获1921年诺贝尔物理学奖。牛顿,英国物理学家、数学家与天文学家。创立牛顿运动定律和发现万有引力定律。1666年用三棱镜分析日光,发现白光由不同颜色的光构成。1671年研制反射望远镜观察行星运动规律。解释潮汐现象,预言地球不是正球体。麦克斯韦,英国物理学家、数学家,英国皇家学会会员。他建立电磁场的基本方程,指出光的本质是电磁波。玻尔,丹麦物理学家。量子力学创始人之一。     

暢谈大学物理教学内容现代化

一、实践 大学物理教学现代化,现在是教师们讨论的热门话题。有的杂志,例如《大学物理》还发表了许多文章进行讨论。笔者对此问题有一些想法,也曾经有一些做法。兹简述如下。 物理教学要现代化,其理由是不言自明的。它是教育现代化的一个具体体现。大学物理教学的现代化包括教学内容的现代化与教学方法的现代化,比较起来,前者当然更根本一些。 物理教学内容要现代化,首先要增添现代物理学发展的新成就,包括实验和理论。几十年来,物理学中已有了“近代物理”部分。但一般讲来,其内容多止于量子力学基本概念,包括波粒二象性,不确定性原理,势阱中的粒子等。粒子的介绍一般也只止于核子和电子。关于宇宙除了介绍一点宇宙射线外,可以说毫无触及。这些内容也就只相当于本世纪20或30年代的物理学的成就。从那时以来,不论是小到粒子,大到宇宙,中间涉及分子,原子及凝聚态,都有了长足的发展。这些发展应该有重点地引进到物理教学中来。在     

我的老师朱洪元先生

 1992年6月初,因开会路过北京,听说朱先生因病住院,急忙赶到同仁医院去看望他。在病房中看着朱先生消瘦的面容,心里真是痛极了。朱先生说,平日只注意心脏不要出毛病,没想那里出了问题。他嘱咐我,一定要多活动。从医院出来,眼泪再也止不住了。没想到这次见面竟是永别。五个月后,从计算机网络中得知朱先生仙逝了。     

施士元先生在物理学会年会上的讲话

诸位领导,老师们、同学们:非常高兴,在百岁之际,我还能出现在物理学会年会这个氛围庄严活跃、充满吸引力的学术园地。常言道:“人生不满百,常怀千岁忧。”而我,习惯于泰然处事,可以说是无忧无虑地走过了百年。回首既往,感慨殊多。1925年,我开始与物理学结下不解之缘。1929年,我从清华大学毕业,去法国巴黎大学居里夫人研究所学习。1933年回国之后,我一直在中央大学———南京大学任教。这么多年的教学科研实践和复杂多样的生活历程,无论是经验或是教训,对后人也许会有所启迪。所以,尽管我年迈体衰,我还是撰写了这本简短的回忆录。感谢南京大…     

New approaches on application of multipole moments for determination of toroidal plasma shift

An application of multipole moments for the determination of toroidal plasma column shift is presented. First, we present analytical details for using this technique. Then, the principle of different models based on this technique for design and fabrication of a six coils will be presented: four modified Rogowski coils (two cosine coils and two sine coils) and two saddle coils (saddle sine coil and saddle cosine coil). As continuous measurements of magnetic field distribution around the toroidal plasma can be made using these coils, this technique is a good method for the determination of toroidal plasma column shift.     

Approach to Generate Radiometric Images

A new technique to generate radiometric images from the optical images is introduced in this paper. This technique can be applied in generating the source images for purpose of image-matching navigation. For comparison, two radiometric images are presents, one is imaged by a 8mm ground-based radiometer and the other is generated by this technique.     

Artifact-free black-blood cine cardiac imaging in a single breath-hold

Fast imaging using the STimulated Echo Acquisition Mode (STEAM) sequence can produce cine images of the heart with black-blood contrast. Nevertheless, correction of deformation-related artifacts is required in order to maintain myocardial signal throughout the cardiac cycle. Recent work by our group has eliminated this artifact by combining two STEAM sequences acquired with two different demodulation gradients. Unfortunately, these two STEAM sequences were acquired on two separate breath-holds; thus, scan time doubled. In this work, we present a technique to reduce the total scan time by one half, without sacrificing image quality. The technique is based on interleaving two demodulations within one acquisition in order to obtain quality cine images of the heart in a single breath-hold. The technique was tested on animal models and human subjects, and the impact of interleaved acquisition on image quality was studied using quantitative and qualitative measures.     

Angle independent ultrasonic blood flow detection by frame-to-frame correlation of B-mode images

We have previously reported initial clinical results of a novel blood velocity imaging technique utilizing a two-dimensional correlation search applied to consecutively acquired echoes. In this paper, we describe both the physical principles underlying this technique and test tank experiments which define its performance under a variety of conditions. The results indicate that, unlike Doppler flow imaging systems, this technique defines the flow velocity vector in two dimensions and is not subject to aliasing.     

Sensitivity enhancement for measurement of nonlinear refraction using top-hat beams

A simple and high-sensitivity technique is presented to investigate nonlinear refraction. In this technique, a combination of aperture and obscuration disk is introduced in the measurement system. Compared to the top-hat Z-scan, the curves of modified top-hat Z-scan for the nonlinear refraction show a single peak. Furthermore, the sensitivity of this new technique can be more than two orders of magnitude enhanced. Nonlinear refraction of Nd-doped phosphate glass is investigated using this technique with 19 ps pulses at wavelength of 532 nm.     

Decoupling technique of patch antenna arrays with shared substrate by suppressing near-field magnetic coupling using magnetic metamaterials

In this paper,we propose the decoupling technique of patch antenna array by suppressing near-field magnetic coupling(NFMC) using magnetic metamaterials.To this end,a highly-integrated magnetic metamaterials,the substrate-integrated split-ring resonator(SI-SRR),is firstly proposed to achieve negative permeability at the antenna operating frequency.By integrating SI-SRR in between two closely spaced antennas,magnetic fields are blocked in the shared substrate due to negative permeability of SI-SRR,reducing NFMC between the two antennas.To verify the technique,a prototype was fabricated and measured.The measured results demonstrated that the isolation can be enhanced by more than 17 dB even when the gap between the two patch antennas is only about 0.067 A.Due to high integration,this technique provides an effective alternative to high-isolation antenna array.     

利用磁光调制实现方位角垂直传递

本文详述了一种可以实现无机械连接的方位角垂直传递技术,并进行了精度分析.这种方法利用了偏振光的物理特性,从原理上突破了国内瞄准技术的局限,并采用磁光调制技术提高检测精度.演示装置的对准重复精度达到3σ≤10^″.     

Accelerating fast Fourier transform and filtering operations in Fourier fringe analysis for accurate measurement of three-dimensional surfaces

This paper describes two techniques to accelerate the Fourier fringe analysis technique. The two 2-D Fourier transforms required for the technique are usually a bottleneck for good-quality images in which unwrapping is straight forward. Automation of the filtering operation is an operation that very often requires user interaction when two peaks at similar frequencies are present in the Fourier transform. The techniques presented in this paper attempt to solve these issues. The first technique proposes a reduction in the number of pixels calculated by the Fourier transform. The second, automates the filtering operation to avoid user interaction.     

Realizing variable contrast technique in MRC measuring target using integrating sphere

In order to realize variable contrast in the minimum resolvable contrast(MRC)measuring target in the visible imaging system, a novel technique is presented, which adopts two integrating spheres to illuminate two sides of target respectively and the different contrasts can be achieved by regulating the luminancein two integrating spheres. This technique can make the contrast be regulated more conveniently. Based on this technique, the MRC measuring device is developed. This device can be used in all kinds of trial fields. The expanded uncertainty of measuring MRC is less than 3％.     

A simple technique for holographic multiplexing

A technique for holographic multiplexing is proposed which utilizes a combination of theta modulation and carrier frequency multiplexing. Twenty two binary transparent object were multiplexed with this technique and a resolution of 10 lines/mm with good diffraction efficiency was obtained. The technique can be used for studying the sequential events at discrete time intervals.