非洲爪蟾卵提取物中200nm膜泡与环形片层及核被膜上核孔复合体形成的关系

将ＬａｍｂｄａＤＮＡ引入活化的非洲爪蟾卵提取物中，在由磷酸肌酸与磷酸肌酸激酶构成的ＡＴＰ再生系统的参与下，在这种非细胞体系中能够围绕由ＬａｍｂｄａＤＮＡ诱导形成的染色质重建核被膜结构，同时在染色质外出现类似核被膜结构的环形片层。在这两种膜结构中核孔复合体的形成都与直径２００ｎｍ左右的单层圆形小膜泡密切相关，这些小膜泡可以附着在染色质表面或独立于染色质之外相互融合成扁平囊状的双层膜片层，双层膜进一步融合形成核孔，与此同时，核孔复合体在核孔上完成装配。     

Morphology and Forming Mechanism of Rare Earth Inclusions During Solidification of Steel

ＭｏｒｐｈｏｌｏｇｙａｎｄＦｏｒｍｉｎｇＭｅｃｈａｎｉｓｍｏｆＲａｒｅＥａｒｔｈＩｎｃｌｕｓｉｏｎｓＤｕｒｉｎｇＳｏｌｉｄｉｆｉｃａｔｉｏｎｏｆＳｔｅｅｌ￥ＺｈａｉＱｉ－Ｊｉｅ（ＤｅｐａｒｔｍｅｎｔｏｆＭｅｔａｌｌｕｒｇｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＳ...     

Speed–accuracy tradeoff in Fitts’ law tasks—on the equivalency of actual and nominal pointing precision

Pointing tasks in human–computer interaction obey certain speed–accuracy tradeoff rules. In general, the more accurate the task to be accomplished, the longer it takes and vice versa. Fitts’ law models the speed–accuracy tradeoff effect in pointing as imposed by the task parameters, through Fitts’ index of difficulty (I_d) based on the ratio of the nominal movement distance and the size of the target. Operating with different speed or accuracy biases, performers may utilize more or less area than the target specifies, introducing another subjective layer of speed–accuracy tradeoff relative to the task specification. A conventional approach to overcome the impact of the subjective layer of speed–accuracy tradeoff is to use the a posteriori “effective” pointing precision W_e in lieu of the nominal target width W. Such an approach has lacked a theoretical or empirical foundation. This study investigates the nature and the relationship of the two layers of speed–accuracy tradeoff by systematically controlling both I_d and the index of target utilization I_u in a set of four experiments. Their results show that the impacts of the two layers of speed–accuracy tradeoff are not fundamentally equivalent. The use of W_e could indeed compensate for the difference in target utilization, but not completely. More logical Fitts’ law parameter estimates can be obtained by the W_e adjustment, although its use also lowers the correlation between pointing time and the index of difficulty. The study also shows the complex interaction effect between I_d and I_u, suggesting that a simple and complete model accommodating both layers of speed–accuracy tradeoff may not exist.     

基于Rough集的遥感影像增强方法研究

通过对Rough集理论特点和遥感影像信息的不确定特性分析,基于对Rough集理论的不可分辨关系、近似集合和分类概念的分析,研究实现了一种保护图像边缘的遥感图像滤波和增强的算法,并通过实验证明了该算法的效果和有效性.     

天康面粉公司制粉车间局部技改介绍

山东巨野国家粮食储备库天康面粉公司制粉车间始建于2000年,设计能力为处理小麦100t/d.主要设备有FMFQ10×2/6×2磨粉机8台,FS-FG6×24C高方筛3台,FQFD50×2×3清粉机2台,磨辊总接触长度12000 mm,平筛总筛理面积138.8 m2,单位磨辊接触长度12 mm/(100kg·d),单位平筛筛理面积0.14 m2/(100kg·d).麦间清理工艺(包括初清)为4筛2打2去石3磁选2着水,粉间工艺为488M1S2T4P3Br.     

变频器在恒压供水上的应用

简要介绍了JP6C—AP1变频器的特点及在恒压供水上的应用。     

二维卡尔曼─中值混合自适应滤波

本文提出了能同时抑制加性噪声，脉冲噪声干扰和点扩展函数模糊，又能保护图象边缘及细节信息的新型滤波方法—“二维Kalman－Median混合自适应滤波”，并成功地应用于统计图象恢复，取得了满意的效果。     

费县矿业开发对水土保持的影响及对策

费县地处沂蒙山腹地,属低山丘陵区,辖18处乡（镇）,565个村,91.7万人,其中农业人口84.5万人,总面积1894.48km^2。全县分3个地貌单元,北部蒙山山系,西南部老虎山山系,中部为山前倾斜平原。该县矿产资源丰富,主要有金、银、铜、铁、花岗石、石灰石、大理石、水晶石、硅石、玛瑙、陶土、金星石、天景石等20多种．     

供水水源及管线分布式微机网络系统

本文介绍了一种由ＡＴ３８６为主机，６台ＱＡＴ２８６和最多可增加到２５６台ＭＣＳ－５１单片机系统为从机，采用两种通讯介质（２０ｍＡ电流环和无线电）所组成的分布式微机网络系统。并介绍了该系统的结构设计和软件研制。     

有机锡类农药——三唑锡液相色谱分析

用高效液相色谱分析农药三唑锡,采用强阳离子交换柱,甲醇、水、冰醋酸作流动相以及紫外检测器。结果表明,此法分离效果好,准确度和精密度高,可用于三唑锡生产控制及原药、各种制剂(粉剂、胶悬剂)产品分析。