论明清以来壮族种植结构的变迁

壮族是典型的稻作民族。明清以来,其农作物的种植结构因受地形、气候等自然地理因素,以及农作物的引进、人口的迁移等人文地理因素的影响,壮族地区农作物种植结构具有显著的特征。主要是平原地区农作物种植的品种不断增加,但水稻种植一直占据绝对的主导地位,而玉米、麦等杂粮在种植结构中的比重,大致呈由平原、丘陵向山地不断提升的趋势。这种变化正是壮族适应边疆民族地区农业地理环境的结果。     

清末呼兰地区移民与农业开发

呼兰是清政府在东北最早开禁的地区。1860～1903年,清朝先后开放了蒙古尔山、通肯等地区,关内移民开始大量涌入呼兰地区．土地开发规模迅速扩大,粮食产量大幅度提高,农产品加工业崛起,农产商品率迅速提高,促进了农业的近代化。     

明清时期安徽植棉研究

对明清时期安徽种植与推广棉花的情况进行初步探讨。     

明清时期导致人口大量死亡的疫灾时空分布及灾害链研究

文中通过检索《中国基本古籍库》及《爱如生数据库·中国方志库》,搜集史料,构建导致人口大量死亡的疫灾频次与县次序列.采用最小二乘法、空间插值等方法,探讨疫灾发生的时间与空间分布特征,并通过灾害链分析疫灾发生的过程.结果表明:1)自公元1368年至1911年,导致人口大量死亡的疫灾共计发生156次,平均3.49a发生一次;...     

Information fusion for tactile sensor array signals

According to the solubility parameters of aged asphalt system, the effect of the recycling agent components on the compatibility of aged asphalt was studied by using the molecular dynamics method. And the mechanism between the recycling agent and the aged asphalt is investigated based on the interaction energies analysis. The results show that the aromatic is helpful to improve the compatibility of aged asphalt, and the more the aromatic is, the better the recycling effect would be. However, the effect of saturate is negative. These results are consistent with the experimental data. With the increase in dosage, the interaction energy between aromatic and aged asphalt increases significantly because of their bigger electrostatic interaction energy and smaller Van der Waals forces. However, the interaction energy between the saturate and aged asphalt shows no obvious change in which the electrostatic and van der Waals interaction energy is almost the same. The main factor for aged asphalt recycling is electrostatic interaction energy between molecules.     

清代广州的绿化与绿色景观

随着城市的飞跃发展,清代广州的绿化活动也迅速发展起来,居宅、公共园林、寺庙、书院、衙署乃至山丘河湖隙地纷纷植树、栽花、种草,广州城市呈现出一片片绿色的景观.     

Analysis of gene expression profile of multidrug resistant MCF/DOX cell line after benflumetol derivative LY980503 treatment

AIM:To investigate the effect of LY980503(a benflumetol derivative)on multidrug resistance of tumor cell line using DNA microarray.METHODS:Total RNA was extracted from multidrug resistant MCF/DOX cell line. cDNA microarray containing 320 cDNAs was used to detect the gene expression profile.RESULTS:9 down-regulated genes and 1 up-regulated gene were identified after multidrug resistant MCF/DOX cells were treated with LY980503.CONCLUSION:LY980503 can effectively reverse the resistance of MCF/DOX to DOX in vitro by adjusting the expression of multi-genes.     

畜舍内混合气体定量检测系统的研究

将气体传感器阵列与神经网络模式识别技术相结合,构建了一个多组分混合气体定量检测系统,进行了初步的试验,并对试验方法进行了改进.结果表明,用该方法识别准确率接近93%,为畜舍内空气质量的在线检测打下了良好的基础.     

被忽视的晚清诗文拓荒者——论胡先骕之诗文评

上个世纪20年代,胡先骕在《学衡》发表多篇关于清代诗词集的评论。他独具慧眼,对赵熙、阮大铖、刘光第等人的研究,皆有开山奠基之功,后世研究多以此为基础,可谓是晚清诗歌研究的拓荒者。在这些文章中,胡先骕强调道德节制、中庸等思想,反对白话文运动,体现了他保守主义的文化观。也正由于胡先骕的文化立场及其他复杂原因,导致其诗歌研究的开拓之功,长期以来未得到应有的重视。     

Cortical gene expression pattern in rat focal cerebral ischemia

AIM: To investigate the genes differential expression in cortex during rat focal cerebral ischemia.METHODS: cDNA microarray chips containing numerous cDNAs were used to investigate the gene expression pattern between samples of focal cerebral ischemia and sham-control operation rats. RESULTS: Two hundred and eleven genes differentially expressed were screened out, among these genes, up-and down-regulated genes were 199 and 12, respectively. CONCLUSIONS: The analysis of gene expression pattern of focal cerebral ischemia based on cDNA microarray can realize high-throughput screening of the genes associated with the focal cerebral ischemia. The differential expression of genes may be related to the pathogenesis of focal cerebral ischemic diseases.