《史记》的“好奇”与“成一家之言”关系探颐

《史记》中的奇言、奇行、奇人、奇事,可谓是俯拾即是,人们对这些现象的研究,往往也只是停留在表象上的概括总结,而忽略了产生该现象的深层次原因——"成一家之言"的推动。本文拟从《史记》的体例建构;素材剪辑;人物选择;人物塑造四个方面来讨论一下这个问题。     

计算机科学与技术专业人才培养的实践与思考

针对近年来计算机科学与技术专业特色不明显和教育质量下降的问题,通过对信息技术产业中嵌入式系统的发展,本校办学定位及国际合作项目的研究,提出了计算机科学与技术专业(嵌入式系统方向)的人才培养方案。该方案从应用型人才培养的角度出发,强调工程实践能力的培养,学生毕业后实现了零距离上岗,解决了该专业特色不明显和教育质量不稳定的情况,深受用人单位欢迎。     

2008年海南罕见长“低温阴雨”天气过程成因分析

为了对今后"低温阴雨"灾害天气过程的预报和服务起到积极的推动作用,利用NCEP再分析资料和单站要素资料对2008年1月下旬至2月中旬海南省出现的长"低温阴雨"灾害性天气过程进行了分析.得出:高空环流形势异常、以乌拉尔山阻塞高压为主体的两槽一脊环流形势长时间稳定是导致此次长"低温阴雨"天气过程出现的直接原因.另外,200 hPa散度分布、850 hPa水汽通量、气象要素在单站剖面图上的演变情况等,对分析和预报此次长"低温阴雨"天气过程也起到一定的作用.     

Practical Application of Miyazaki Jitokko Chickens Selected for a Superior Allele at a Single Nucleotide Polymorphism Site in the Cholecystokinin Type A Receptor Gene

This study aimed to examine 1) whether selection for a superior allele at a single nucleotide polymorphism site (SNP; {"type":"entrez-nucleotide","attrs":{"text":"AB604331","term_id":"315258605","term_text":"AB604331"}}AB604331, g.420 C>A) of the chicken cholecystokinin type A receptor (CCKAR) gene in Miyazaki Jitokko chickens is detectable in commercial poultry farms, and 2) whether the reproductive traits of the Kyushu Rhode hens, as a maternal stock line of the Miyazaki Jitokko chickens, are affected by SNP selection. Conventional and A-allele fixed (improved) Miyazaki Jitokko chicks were hatched on the same day and raised in a battery cage until 7 days of age. The chicks were then deposited at two commercial poultry farms and reared until slaughter at 126 and 163 days for cockerels and pullets, respectively. Body weight on the day of hatching (day 0), at 5 days of age, and at slaughter were measured. The differences in the body weights of the farm and test groups at slaughter were analyzed using the generalized linear model. A-allele fixation increased the body weight at slaughter by approximately +123.5 g and +131.9 g in cockerels and pullets, respectively. No significant differences between the conventional and improved hens were detected in terms of egg-laying rate, fertilization rate, and hatchability in the Kyushu Rhode hens. The data suggest that fattening chicks can be supplied as usual, even if Kyushu Rhode hens are switched from the conventional to improved type. In conclusion, genetic improvements using the CCKAR SNP site as a marker were effectively established in terms of the growth of the Miyazaki Jitokko chickens in commercial farms and the reproductive traits of the Kyushu Rhode hens.     

基于MSER仿射变换配准的农用柔性pH芯片性能优化

针对柔性pH芯片复合结构多层打印制备过程的配准偏差严重，限制其农用pH值在线监测精度及稳定性问题，比较分析了MSER仿射变换模型对“叠层复合结构”柔性pH芯片性能的影响，分析了配准后柔性pH芯片在基质培番茄根系pH值在线监测应用中的可行性。试验结果表明：MSER仿射变换模型配准后，农用柔性芯片加工最小线宽和线间距分别为90、500μm,芯片加工平均相对误差可控制在25%以内；配准后，农用柔性pH传感器灵敏度达到了每单位pH值-61.9 mV,响应范围为2.0～10.0,与商用玻璃pH电极的测量绝对误差小于0.15,相对误差小于4.1%;基质培番茄根系pH值监测试验中，自制柔性芯片与商用pH电极的测量结果具有较好一致性，同步测定结果的绝对误差小于0.09,相对误差小于1.5%,RMSE仅为0.05。MSER仿射变换配准方法可有效提高“叠层复合结构”农用打印柔性传感芯片的制备精度及传感检测准确性。     

dCAPS markers developed for nitrate transporter genes TaNRT2L12s associating with 1 000-grain weight in wheat

Nitrate transporters(NRTs) are regulators of nitrate assimilation and transport. The genome sequences of TaNRT2L12-A,-B and -D were cloned from wheat(Triticum aestivum L.), and polymorphisms were analyzed by sequencing. TaNRT2L12-D in a germplasm population was highly conserved. However, 38 single nucleotide polymorphisms(SNPs) in TaNRT2L12-A coding region and 11 SNPs in TaNRT2L12-B coding region were detected. Two derived cleaved amplified polymorphic sequences(d CAPS) markers A-CSNP1 and A-CSNP2 were developed for TaNRT2L12-A based on SNP-351 and SNP-729, and three haplotypes were identified in the germplasm population. B-CSNP1 and B-CSNP2 were developed for TaNRT2L12-B based on SNP-237 and SNP-1 227, and three haplotypes were detected in the germplasm population. Association analyses between the markers and agronomic traits in 30 environments and phenotypic comparisons revealed that A-CSNP2-A is a superior allele of shorter plant height(PH), length of penultimate internode(LPI) and peduncle length(PL), B-CSNP2-G is a superior allele of higher grain number per spike(GNS). Hap-6B-1 containing both superior alleles B-CSNP1-C and B-CSNP2-A is a superior haplotype of 1 000-grain weight(TGW). Expression analysis showed that TaNRT2L12-B is mainly expressed in the root base and regulated by nitrate. Therefore, TaNRT2L12 may be involved in nitrate transport and signaling to regulate TGW in wheat. The superior alleles and d CAPS markers of TaNRT2L12-A/B are beneficial to genetic improvement and germplasm enhancement with molecular markers-assisted selection.     

一元材积表与一元出材率表的相关性分析——以福建省永安市尾叶桉为例

以福建省永安市尾叶桉一元材积表和一元材种出材率表为例,运用相关分析与曲线回归分析方法定量研究两数表中各径阶材积和总出材率之间的关系。研究结果表明:各径阶材积与出材率呈明显正相关关系,回归方程为y=e4.429-0.004/v,相关指数为0.997;永安市尾叶桉随着材积的增大,其出材率趋于84%。明确各径阶材积与出材率之间的关系,既可简化编表工作的人力、物力,为其他数表关系的研究提供参考,也可为完善林业数表体系提供依据。     

浅谈战略转型条件下海南橡胶资产的保护

对番木瓜传统的单芽腹接法种苗繁殖进行芽接技术的创新研究，并采用3种嫁接方法进行比较试验。结果表明：不同品种的番木瓜采用创新研究技术的单芽腹接创新法的发芽率为67.50%，比传统单芽切接法高23.6%；单芽腹接创新法比切接法的发芽率高14.8%；芽接技术的创新研究取得了突破性进展，其研究结果对番木瓜产业化的发展具有重要的促进作用。     

沙棘对大鼠胸腺基因表达谱的影响

通过对大鼠胸腺进行基因表达谱分析,评价沙棘对大鼠胸腺基因表达谱的影响。结果表明:与空白对照组比较,服用沙棘组出现表达差异基因共15条,其中ratio>2的上调基因11条,而ratio<0.5的下调基因4条,涉及免疫细胞因子、细胞凋亡等相关基因。可见沙棘影响了胸腺基因的一系列表达,这些基因的表达可能为从分子水平探讨沙棘促使T细胞生长提供基础。     

民族院校计算机基础课教育的反思——以北方民族大学为例

随着信息技术的迅速发展,社会对人才的需要已经由单一的知识型到知识技能型。本文结合民族院校的实际情况,以北方民族大学为例,分析了计算机基础课教学中所存在的问题,结合本校提出了对民族院校计算机基础课的一些改进措施,分层次分专业教学、案例教学、实验小班授课,建立自主学习平台等,以提高民族院校计算机基础课的教学效果,提高学生计算机的实际操作能力。