The crystal-like anatomical uniformity of the striate cortex

The visual field is topographically mapped onto the primary visual cortex (V1), forming a retinotopic map which is far more detailed for the foveal regions than for the periphery. We found that receptive field (RF) size in monkey V1 increases with eccentricity, and that a 1—2 m² V1 region contains roughly a complete set of machinery necessary to analyze a visual-field area whose size is about that of the RFs of the cells. This allows V1 to be anatomically uniform, and is in sharp contrast with the retina.     

活动标形及其在点啮合齿轮传动误差分析中的应用

活动标形法的论述首推苏步青译，佐佐木重夫著《微分几何学》，还有的著作从外微分形式引入活动标形,本文论证取曲面的正交曲率网为参数网时，曲面论的基本公式就是活动标形的微分形式，并用其分析了点啮合齿轮传动误差．     

Calculation of the Specific Heats for the Ⅱ—Ⅲ and Ⅱ—Ⅳ Phase transitions in NH4I

This study gives our calculation for the specific heats CVI due to an Ising model using the observed Cp data for the Ⅱ-Ⅲ and Ⅱ-VI phase transitions in NH4I.By fitting to the CP data we determine the values of the critical exponent for the pressure of 0.14GPa(Ⅱ-Ⅲ phase transition)and for the pressures of 0.75,1.35and 1.97 GPa (II-IV phase transition)in NH4I.Our exponent values values are close to the predicted values of the specific heat in a three-dimensional Ising model.Our calculated CVI are in good agreement with the experimental CP for NH4I in most cases.     

Numerical Calculation and Analysis of Track Etching Process

Heavy ion irradiated polymers can be chemically etched to form track membrane with pores in the micro and sub-micro ranges. It has been reported that pore growth during etching can be related to track structures. A latent track has a track core inside and a track halo surrounding the track core. By single track etching it is observed that etching in the track core is much faster than in the track halo where the etching rate is even lower tlian that of bulk material. For multi-track etching, no such stages can be seen by the conductance measurements.     

α-FUZZY PAIRWISE RETRACT OF L-VALUED PAIRWISE STRATIFICATION SPACES

The notion of a fuzzy retract was introduced by Rodabaugh (1981). The notion of a fuzzy pairwise retract was introduced in 2001. Some weak forms and some strong forms of α-continuous mappings were introduced in 1988 and 1997. The authors extend some of these forms to the L-fuzzy bitopological setting and construct various α-fuzzy pairwise retracts. The concept of weakly induced spaces in the case L = [0,1] was introduced by Martin (1980). Liu and Luo (1987) generalized this notion to the case that L is an arbitrary F-lattice and introduced the notion of induced L-fts. Several results are obtained, especially, for L-valued pairwise stratification spaces.     

火花熔蚀-电感耦合等离子体光谱法分析地质矿物

火花熔蚀-电感耦合等离子体光谱法(SA-ICP)用于测量锆石中铪-锆比值和锰铁矿瘤中的铈、钴、铁、铅、镍和磷。用信背比和信嗓比的序贯单纯形优化法建立了用于高压火花和氩气ICP系统的六个操作参数。将磨细的样品与铜压成饼,从样品中熔蚀出的分析物和基体元素的原于发射信号的时间相关性给出一种用火花来作选择取样的方法。测量锆石中的铪、锆浓度比的精密度为4%(相对标准偏差)。对于锰铁矿瘤,根据分析线对锰(Ⅱ)257.610纳米线强度比的光谱测量结果达到分析精密度范围为7-14%(相对标准偏差)。分析的准确度用参比物USGS诺得(Nod)P-1的标准物加入法来决定,而与锰浓度的测量无关。     

使用霍尔探头来测定四极磁铁的磁轴和机械轴之间的距离

本文的作者用数学、物理的方法推导并用二个实例阐述了使用霍尔片在四极磁铁孔穴内旋转来测得在四个极头方向上场强的极值,从而来计算该磁铁的磁轴和机械轴之间的距离和相对方位。GSI自1971年直到目前都是用这种办法来检验该所的加速器系统中的每一个四极磁铁的制造质量。使用与计算机速接的霍尔片的测磁系统,对各种规格的四极磁铁,一般在20分钟内可以得到测量结果。     

数理教育工作者应该协同工作

在教了几乎20年数学之后，我最近决定学习并执教物理．     

冰岛南部Bodmodsstadir地热田的概念模型和自然状…

Ｂｏｄｍｏｄｓｓｔａｄｉｒ地热田是冰岛南部低温地热田之一。１９７４年以来，已完成１０口钻井。根据温度测井，井中压力和水位测量和一些地质地球物理资料研究，本建立了它的概念模型。为了进一步建立该地热田的自然状态模型，本进行了稳态和非稳态地温场模拟。通过假定一倾向北西的主断裂，模拟计算地温也观测地温吻合得很好，非稳态模拟还表明象这样的地热系统形成后５０００ａ就能达到准稳态（自然状态）。进一步通过求解