Relation between brain architecture and mathematical ability in children: A DBM study

Population-based studies indicate that between 5 and 9 percent of US children exhibit significant deficits in mathematical reasoning, yet little is understood about the brain morphological features related to mathematical performances. In this work, deformation-based morphometry (DBM) analyses have been performed on magnetic resonance images of the brains of 79 third graders to investigate whether there is a correlation between brain morphological features and mathematical proficiency. Group comparison was also performed between Math Difficulties (MD-worst math performers) and Normal Controls (NC), where each subgroup consists of 20 age and gender matched subjects. DBM analysis is based on the analysis of the deformation fields generated by non-rigid registration algorithms, which warp the individual volumes to a common space. To evaluate the effect of registration algorithms on DBM results, five nonrigid registration algorithms have been used: (1) the Adaptive Bases Algorithm (ABA); (2) the Image Registration Toolkit (IRTK); (3) the FSL Nonlinear Image Registration Tool; (4) the Automatic Registration Tool (ART); and (5) the normalization algorithm available in SPM8. The deformation field magnitude (DFM) was used to measure the displacement at each voxel, and the Jacobian determinant (JAC) was used to quantify local volumetric changes. Results show there are no statistically significant volumetric differences between the NC and the MD groups using JAC. However, DBM analysis using DFM found statistically significant anatomical variations between the two groups around the left occipital-temporal cortex, left orbital-frontal cortex, and right insular cortex. Regions of agreement between at least two algorithms based on voxel-wise analysis were used to define Regions of Interest (ROIs) to perform an ROI-based correlation analysis on all 79 volumes. Correlations between average DFM values and standard mathematical scores over these regions were found to be significant. We also found that the choice of registration algorithm has an impact on DBM-based results, so we recommend using more than one algorithm when conducting DBM studies. To the best of our knowledge, this is the first study that uses DBM to investigate brain anatomical features related to mathematical performance in a relatively large population of children.     

基于组件式GIS的电子地图集的设计与实现

论述了传统GIS开发的制约因素及基于组件GIS开发软件系统的意义，给出了MapObjects的数据结构及图形显示机制．以福建省经济电子地图集为例，论述了以Map Objects组件进行电子地图设计与制作的方法，阐述了与传统GIS相比，基于组件式GIS的系统设计与实现在软件开发、复用、更新及开放性方面的优点．     

Colorimetry of Ion-Plasma Protective-Decorative Coatings

On the basis of recommendations of the Commision Internationale de L'Eclairage CIE) an attempt has been made to construct a logically consistent system of attesting the color of protective-decorative coatings formed by ion-plasma techniques. An algorithm of data translation from the CIE system to the specifications of the color atlases used in Russia, the USA, Germany, and the UK has been realized.     

基于科学知识图谱的智慧农业研究演进趋势分析

智慧农业是农业农村从数字化阶段向智能化阶段发展的更高级形式,是农业农村现代化发展的大势所趋,对促进农业、农村数字经济转型,有效推动乡村全面振兴战略具有重大现实意义。本研究借助科学知识图谱软件Cite-Space5.7.R5对2000~2021年期间我国智慧农业研究领域的相关文献进行了可视化定量分析,分析其发展趋势和研究热点,以知识图谱的形式清晰直观展现给读者。分析表明,自2015年我国智慧农业发展迅猛,以乡村振兴战略为主旨,聚焦数字化驱动数字乡村建设,持续推动农业、农村现代化发展。本研究在新兴农业科技应用、新型农业科技人才培养、智慧农业基础设施建设、数字化要素驱动智慧农业发展等方面提出了建议,以期为智慧农业领域的进一步研究提供有益参考。     

山蜡梅叶颗粒的高效液相色谱指纹图谱定性及定量分析

应用高效液相色谱法建立可同时对山蜡梅叶颗粒进行鉴别和有效成分含量测定的色谱指纹图谱。以Cosmosil C18色谱柱为分离柱,甲醇与甲酸混合溶液进行梯度洗脱,检测波长为365 nm。成分芦丁、槲皮素和山奈素的质量浓度均与峰面积呈线性关系,线性范围分别为4.6~110.4,1.0~24.0,1.5~36.0 mg.L-1。运用中药色谱指纹图谱相似度评价系统2004版进行分析,20批样品平均相似度为95%以上。颗粒剂中三个成分的含量分别为芦丁含量(130±20)μg.g-1,槲皮素含量(35±10)μg.g-1,山奈素含量(60±10)μg.g-1。建立的山蜡梅叶颗粒的色谱指纹图谱,为质量控制提供新方法。     

毛细管电泳指纹图谱应用于叶下珠药材中黄酮的检测

建立了叶下珠药材中黄酮的毛细管电泳指纹图谱。以硼砂和十二烷基磺酸钠(pH9.0)为背景电解质溶液,运行电压15kV,紫外检测波长245nm,流体静压力进样15s(高度12cm),对不同产地叶下珠药材进样检测。按电泳峰共有率fi≥70%为依据,确定10个不同产地叶下珠药材中黄酮的毛细管电泳指纹峰为8个,各产地叶下珠的毛细管电泳指纹图谱与标准毛细管电泳指纹图谱的相似度较好。在制备供试液后不同时间进样测定,各指纹峰的相对迁移时间的相对标准偏差小于5%,相对峰面积的相对标准偏差在3.0%～7.8%之间,结果表明样品在48h内稳定。     

气相色谱法分析非标柴油

应用气相色谱法建立了国标柴油和非标柴油中饱和烃的指纹图谱。通过分析国标柴油与非标柴油的指纹图谱特征,包括主峰碳数、碳数分布等,确定非标柴油与国标柴油的差异,为柴油的质量控制提供新方法。     

近代历史海图集编制的特殊原则和方法

本文讨论了近代历史海图集及其编制的了'}i夕殊问题,主要有近代历史海图集的功能与编辑方针、数学基础的选择、图集结构的总体设计以及若干特殊图载要素的技术处:理、它们已在浙江海区近代历史海图集的编制中得到应用和验证,并对我国其它海尽近代历史海图集的编制具有参考价值.