关于Maunder极小期太阳活动的统计分析

本文通过自相关分析探讨在“Maunder极小期”期间太阳活动是否仍然存在11年活动周期.利用Eddy根据欧洲望远镜在“Maunder极小期”时观测的太阳黑子记录所作的相对黑子数年平均值进行了自相关分析,也与中国地方志在“Maunder极小期”时的有关黑子记录一起进行了同样的自相关分析.在作自相关分析时采用几种不同的方法进行比较,结果发现,11年活动周期性的存在与否与所选用的统计方法有关,因此不能绝对地说在“Maunder极小期”时太阳活动完全停止了,或者说在“Maunder极小期”时仍然存在着11年周期的活动性质.

双组元气体的磁流体流动及其应用

<正> 由于同位素分离日益增长的需要,提高单极分离系数和产量成为十分重要的问题.机械离心机可以使两种不同气体或液体高速旋转,达到使其分离的目的.但因结构强度限制和存在机械振动,继续提高分离系数有一定困难.能否使用电磁场力来推动两种同位素气体产生更高的转速,达到分离的目的呢?六十年代开始探索其可能性.Gross等人利

溶液热历史对蛋白质晶体生长影响的内在原因研究

从溶液中聚集体的角度研究了溶液的热历史改变生长出的蛋白质晶体的数目和尺寸的内在原因.将在281和309 K下保存1 d的两组溶菌酶溶液按不同比例混合,加入沉淀剂生长晶体.随着高温溶液的比例增加,生长出的晶体数目减少,同时溶液中生长基元的尺寸增大.在5周内,采用动态光散射对281,293和309K三种温度下保存的溶菌酶溶液中聚集体的变化情况进行监测,发现溶液中均存在大小不同的两部分聚集体,称之为小聚集体与多聚体.前者的尺寸基本不随保存时间而变化,而后者尺寸随保存时间增加而减小,减小的速度与保存温度有关.多聚体的尺寸经过5周后和小聚集体基本相同.研究结果表明,处于无序聚集阶段的溶液的均一化程度和成核阶段生长基元的尺寸受到了溶液热历史的影响,并最终对晶体的数目产生影响.

Adiabatic shear localization: occurrence, theories, and applications

Membrane Deformability and Membrane Tension of Single Isolated Mitochondria

Mitochondria dynamics is crucial to many biological processes such as mitochondria fusion and fission, which is highly correlated to the mechanics of single mitochondria. However, the mechanobiological coupling of mitochondria has been poorly understood. Here membrane deformability and membrane tension of individual mitochondria isolated from MtDsRed labeled human embryonic T-Rex-293 kidney cells were measured using a micropipette aspiration assay. The results demonstrated that membrane deformation of isolated mitochondria exhibited an elastic transition phase followed by an equilibrium phase, and mitochondrial membrane tension was proportional to the area compressibility. It was also indicated that mitochondrial membrane deformability was significantly affected by physical chemical factors such as osmotic pressure or pH value, and was further correlated to mitochondrial functionality in different respiratory states and Ca2+ regulation. These findings provide a new insight into understanding the mechanical regulation of mitochondrial physiology.

Solid-state optical parallel morphological processor

Based on birefringence, a building-block stacking technique is suggested in this paper. A solid-state optical morphological processor module is thus developed, which is an integration of a beam array generator submodule, an optical connector submodule, and a Pockels readout optical modulator. It is shown that the technique is compact in construction, simple for fabrication, and insensitive to the environment.