对我国征地补偿制度的若干思考

从分析我国土地征用中利益分配机制入手,基于对国内外土地征用补偿方案的对比研究,对我国土地征用中土地征用范围、征地主体、补偿对象、补偿内容等方面进行了具体分析,并提出了加快制度创新,切实保障农民利益,发挥市场配置资源的基础性作用的若干建议.     

蔬菜钵苗在导苗管中的动力学分析

有序移栽是利用钵苗的重力和导苗管的导向作用来实现的，所以导苗管是移栽机实现有序移栽的一个关键部件。通过对导管式蔬菜钵苗移栽机苗钵栽植过程的动力学分析，建立了苗钵在导苗管中的运动学和动力学模型，对苗钵在导苗管栽植系统内的运动和影响其直立率的因素进行了理论分析。结果表明，降低机器前进速度和增加土壤塑性可以提高钵苗的栽植质量。通过模型的分析，为导苗管的机构设计提供了理论依据。     

冬小麦节水高效优化灌溉制度模型应用研究

根据霍泉灌区田间试验资料,考虑水分亏缺的后效性,以冠层叶面积指数修正后的作物-水模型作为目标函数,建立二雏动态规划模型,计算冬小麦节水高效优化灌溉制度。结果显示,该模型充分反映了灌水时间、灌水定额和灌溉水量产生的冬小麦的产量效应,所建模型和参数确定较合理,在实践中更有实用性。     

5XY-5型种子圆筒筛分级设备的研制

针对国内圆筒筛分级设备现有传统产品存在的问题,并结合国家重大项目,研制开发了5XY-5型种子圆筒分级设备.为此,介绍了该机的基本结构、工作原理、关键部件的设计以及主要工作参数等,并对均配喂料、清筛装置、筛下物输送、半轴牙嵌离合器等部件及筛筒转速等做了较详细研究分析.对玉米的作业性能试验表明:分级合格率≥97.6%,生产率为5.6t/kW·h,噪声≤83dB;连续生产运行100h无故障,性能稳定.     

龙山县沼气建设发展现状及对策思考

龙山县建成沼气池2万余口，主要依靠技术、资金和组织等支持，针对存在的一些问题，提出了加大投入，制定适宜发展目标，建立奖惩制度，提高组织能力，坚持技术标准，合理调整计划，因地制宜，逐步三改，加强后续服务，搞好综合利用等对策思考。     

敦煌西晋画像砖所绘“白象”形象溯源

敦煌佛爷庙湾西晋早期墓出土的白象画像砖,是佛教在当时被视为一种神秘性方术而存在的现实表现。本文对敦煌西晋画像所绘“白象”形象进行溯源,认为画像砖上的六牙白象应该是中国早期佛教朝着神秘主义方向发展的一个缩影。     

基于遗传算法的遥感数字图像镶嵌研究

遥感数字图像的镶嵌处理是遥感图像处理的基本工作之一，为此介绍了一种基于遗传算法确定图像重叠区和调整图像色度，以辅助完成遥感图像的镶嵌工作的新方法。     

江西省农业数字园区信息系统的架构与实现

农业数字园区JPDAMIS将成为农业生产新的信息源,任何与农业生产有关的信息,都将被定位,并与空间数据库联系起来。用户可以多媒体的形式查询农业生产信息,获得所需的信息。为此,介绍了建立江西省农业数字园区信息系统的必要性和实现,及其应用和前景     

p300/p53/Smad3 pathway involved in aging-related atrial fibrosis in human atrial fibroblasts

AIM To investigate the role of p300 in aging-related atrial fibrosis in human atrial fibroblasts （HAFs） and its potential mechanism. METHODS HAFs were obtained from human left atrial tissue, and the senescence model was established by cell passage. Senescence-associated β-galactosidase （SA-β-Gal） staining was used to detect the cell senescence, and Western blot was used to determine the protein levels of p300, p53, Smad3 and other senescence and fibrosis associated proteins in HAFs. RESULTS Compared to passage 3 HAFs, the proportion of senescent cells, and the protein levels of p300, p53, p-Smad3 and other senescence and fibrosis associated proteins were increased in HAFs at passage 7 and 11 （P<0.05）. After treated with curcumin （a p300 inhibitor） or transfection with p300 small-hairpin （sh） RNA plasmid, the protein levels of p300, and the senescence and fibrosis associated proteins were decreased in HAFs at passage 7（P<0.05）. Up-regulation of p300 by transfection with p300 over-expression plasmid increased the protein levels of p53, Smad3 and MMP-2 in HAFs at passage 3 （P<0.05）. CONCLUSION p300/p53/Smad3 signaling pathway plays an important role in aging-related atrial fibrosis in HAFs.     

Correlation between progression of atherosclerosis accelerated by emotional stimulation and imbalance of SDF-1/CXCR4 in mice

AIM To observe effects of emotional stimulation on expression of stromal cell-derived factor-1（SDF-1） and CXC chemokine receptor 4 （CXCR4） in plasma, platelets, aortas, hippocampus and bone marrow of apolipoprotein E gene knockout （ApoE^-/-） mice, and to reveal the possible mechanism of the aggravated atherosclerotic plaque vulnerability by emotional stimulation. METHODS Thirty 8-week-old male ApoE^-/- mice were randomly divided into normal control group, high fat group, and emotional stimulation group. Ten 8-week-old inbred C57BL/6J mice served as blank control group. After 12 weeks of intervention, the serum levels of SDF-1 and CXCR4 were investigated by ELISA. The protein levels of SDF-1 and CXCR4 in platelets, aortas, hippocampus and bone marrow were determined by Western blot. The pathological damage of aortas was observed by oil red O staining. RESULTS Compared with blank control group, normal control group and high fat group, the mice subjected to emotional stimulation showed more serious atherosclerosis in aortas detected by oil red O staining, and increased levels of SDF-1 and CXCR4 in the plasma and aortas were also observed （P<0.05）. The results of Western blot showed that the protein levels of SDF-1 and CXCR4 in platelets, aortas and hippocampus were increased in the mice subjected emotional stimulation, but the expression of SDF-1 and CXCR4 in the bone marrow was decreased （P<0.05）. CONCLUSION Imbalance of SDF-1/CXCR4 may be the key target by which emotional stimulation accelerates the progression of atherosclerosis.