一个分类规则的存储结构及查询策略

分析了数据挖掘所获规则的不同应用类型及其实施过程中建立规则管理系统的必要性,提出了一个分类规则管理系统的构建方法,根据对分类规则挖掘过程及结果的抽象,引入元数据知识设计了分类规则的存储结构、查询操作以及建立在此基础上的应用,给出了应用实例·其特点是不仅存储了挖掘结果,同时存储了挖掘过程中涉及的相关数据,更便于对新数据分类和预测·     

蒙古黄芪的组织培养研究

对蒙古黄芪无菌苗的不同外植体(叶片、子叶、下胚轴)进行组织培养研究.结果表明:该三种外植体分别在MS BA2.0mg/L NAA2.0mg/L、LS BA2.0mg/L NAA0.1mg/L、MS BA2.0mg/L NAA2.0mg/L 培养基上的愈伤组织诱导率很高;在这三种外植体中,子叶和下胚轴所诱导的愈伤组织在继代培养基上能分化出芽;试管苗在1/2MS NAA5.0mg/L培养基上生根效果好.     

管棚加固技术在地道桥顶推施工中的应用

介绍了在高速公路不中断交通的情况下，地道桥顶推施工穿越路基时所采用的管棚支护加固路基技术。工程实践表明，该技术有效地抑制了高速公路路面的沉降和路基开挖时的塌陷，保证了高速路的行车安全。     

基于神经网络的铸坯凝固过程自适应控制

对铸坯冷却过程模型进行了改进,同时采用最小方差自适应控制策略和多层前馈神经网络技术,设计了一种铸坯表面温度自适应控制器,该方法克服了传统的拉速配水和根据传热学模型控制喷水的不足,具有一定的实用价值.     

Abnormal expression of centrosome protein (centrin) in spermatozoa of male human infertility

To study the relations between male infertility and centrosome protein (centrin) and the functions of centrin in spermatogenesis, the matured spermatozoa of 10 normal male people and 18 male infertility patients were stained by immunofluorescence labeling antibody against centrin. The results showed that two fluorescence signal dots appeared in the normal male spermatozoa and were located at the base of flagellum. They are proximal centriole and distal centriole. However, in some spermatozoa of the male infertility, centrin protein was located abnormally at the base of flagellum and its staining signals were spread, the normal proximal and distal centrioles were confused and could not be recognized separately. These results suggest that abnormality of centrosome protein may be related to male infertility. This discovery may be used as a marker of abnormal sperm and male infertility.     

Two closely linked rice U14 boxC/D snoRNAs

By analysis of the conserved elements in yeast U14 boxC/D snoRNA. the conserved elements in rice U14 boxC/D snoRNA have been speculated. Through computer search of the international rice genome database, two rice U14 snoRNA gene candidates are obtained. These two putative U14 snoRNA genes are closely linked on rice chromosome 2. The coding sequences of these two snoR-NAs exhibit the hallmark structure of boxC/D antisense snoRNA. They both have conserved boxC and boxD sequences and a 14nt-long complement to the sequence between 414nt and 427nt of rice 18S rRNA (according to GenBank accession no. X00755). The experimental evidence shows that these two snoRNAs are involved in the methylation of the complementary sequence of rice 18S rRNA. The existence and localization of these two snoRNAs are proved by RT-PCR and Northern blot. Further analysis shows that both of the newly found rice snoRNAs have high homology with maize U14 snoRNA. and they are named rice U14.1 snoRNA and U14.2 snoRNA respectively. The gene sequence encoding these two snoRNAs has been deposited in the GenBank database under accession number of AF332622.     

Geochemistry and petrogenesis of Jurassic high Sr/low Y granitoids in eastern China: Constrains on crustal thickness

The Jurassic high Sr/low Y granitoids in eastern China are characterized by high Sr/Y (27—166) and La/Yb (14—66) ratios, low abundance in Y (6—21 μg/g) and Yb (0.5—2.0 μg/g), comparable with those of adakites defined by Defant et al. Thus, they were recently considered as adakitic rocks by some researchers. Compared with the typical adakites in circum-Pacific margins, however, these high Sr/low Y granitoids have higher K₂O (-3.5%) but lower Al₂O₃ (-16.0%) as well as lower Mg^# (-38) and δ Sr_N (-1.23) values. Furthermore, they show relatively flat HREE patterns with Y/Yb values of -10 close to the chondritic value. These geochemical characteristics indicate a residue mineral assemblage of hornblende, garnet and plagioclase for these high Sr/low Y granitoids melt. Thus, they were generated by partial melting at 9—13 kbar (30—45 km in depth), similar to the Archaean high-Al TTG rather than the modern adakites. Generation of these high Sr/low Y granitoids cannot be considered as evidence for a thickened crust (>50 km) and/or the presence of the “Eastern China Plateau” in Jurassic.     

用弯曲应变能方法评价沥青混合料的低温抗裂性能

通过对沥青混合料低温开裂机理的分析和对大量试验结果的总结，以弯曲应能密度临界值为指标来评价沥青混合料的低温抗裂性能，首先，分析了沥青混合料低温开裂机理，其次，在MTS810材料试验系统上进行了0℃下的沥青混合料的低温弯曲试验；最后，用灰关联的方法分析了沥青混合料的弯拉强度、临界弯拉应变、油石质量比，表观密度及所用沥青的针入度等指标对混合料的应变能密度临界值的影响程度，研究表明，一般情况下，沥青混合料储存的弹性应变能越多，沥青混合料的低温抗裂性能就越好，由于沥青混合料的应变能密度临界值指标是混合料临界弯拉应变和弯拉强度2个指标的综合，用它来评价沥青混合料的低温抗裂性能更加科学；低温时沥青混合料的允许变形能力较差，提高混合料的允许变形能力可明显增强沥青路面的低温抗裂性能。     

正丁胺自盐酸溶液中在铝表面上的吸附及其缓蚀作用

本文用失重法研究了在1M盐酸溶液中正丁胺对铝的缓蚀作用,应用吸附理论和Sekine方法处理实验数据,探讨了正丁胺在铝表面上的吸附行为以及吸附与缓蚀作用之间的关系,估算了正丁胺吸附的热力学参数.     

TBQ-1型总日射表倾斜效应理论初探

本文研究了TBQ-1型总日射表的倾斜效应,给出了实验测量的总日射表在各种倾角和不同方位时的倾斜效应。并根据此表的结构,从感应面的热平衡出发,对其各类传热方式随倾角的改变进行理论分析,得到了表内对流换热的改变是倾斜效应的主要原因的结论。最后提出改进总日射表结构以减少倾斜效应的建议。