Comparative Study on Carcass Traits and Meat Quality of Different Month Old of Xinjiang Brown Cattle Steers

In this research,12 heads of 28 to 30 months (low months age group) and 8 heads of 32 to 34 months (high months age group) Xinjiang Brown cattle steers which fed in the same mode of nutrition were chose for the slaughter test,in which the carcass traits,nutrient composition and some edible quality index were measured and comparative analyzed,a research which through comparative analysis the carcass traits and meat quality of nutritional components of different months of Xinjiang Brown cattle steers was carried out.The results indicated that the marbling,carcass grade,fat,meat color of high months age group were better than that of low months age group,the traits of the low months age group on fat color,moisture,protein,cooking loss and shear force value were better than that of high months age group,and there were significant difference on the traits of fat and meat color L^* between the two groups (P<0.05),while the differences of other traits between them were not significant (P>0.05);As high-grade beef,in addition to the traits of meat color and pH value of the chunk roll,tenderloin and striploin,each site of the meat traits on the fat,protein,moisture,cooking loss,shear force value indicators were all better than other parts,and showed the best of nutritional value and edible quality.28 to 34 months of Xinjiang Brown cattle steers could produce high-grade beef,the meat could be used as the raw materials of steak and boiled beef.     

丘陵山地水田旱地交错分布区耕地地力评价

在自然条件下,通过比较水田和旱地地块的肥力差异,选择合适的评价模式,以制定合理的耕地利用依据。结合研究区丘陵山地水田和旱地交错的分布特点,依据最小控制斑块面积确定评价单元数,重点分析了水田和旱地在实际耕作中的差异性,并结合操作实践合理分配水田和旱地在评价体系中各指标的权重系数。结果表明,评价单元数的多少对评价结果的影响比较明显,综合研究区耕地地力实际情况和节约计算耗时的实际,建议最小控制斑块面积在临界值(推荐值)的10%为佳;另外通过水旱分开评价和水旱统一评价两种评价模式的比较,发现水旱分开能使评价结果更加贴近实际情形,反映实际耕地地力状况,能够更加有效地指导农业生产实践。     

吉林省西部新开发水田遥感动态监测研究

为了响应土地整理开发项目的政策,吉林省西部地区开发了大面积的水田。为掌握新开发水田的动态变化,有必要对吉林省地区进行土地利用分类。以吉林省前郭县为例,利用2010年环境卫星数据进行不同土地利用分类方法的比较,进而对另外3景图像进行信息提取,分析4个年份新开发水田的分布及变化情况。结果表明,支持向量机法比最大似然法的耕地分类精度高约5%,其产品和用户精度分别为95%和84%。加入纹理信息没有显著提高分类精度。2009~2012年水田面积分别增加-67.7 km2,111.7 km2和265.01 km2。     

浅析河北省太行山区生态经济沟的可持续发展

河北省太行山区生态经济沟经过20多年的发展已取得了一定的成绩,在促进农业经济发展方面发挥了重要作用.面对新的形势,如何推进生态经济沟健康持续发展是一个重要课题.文章以河北省太行山区生态经济沟发展的现状为切入点,以生态经济相互协调为前提,以山区环境和资源、人口为依据,提出了建设农村高效农业,促进农村支柱产业发展等一系列建...     

景颇族传统民族图案在园林中的应用探讨

少数民族的传统图案是一笔独特的文化财富。本文通过对景颇族传统图案的产生、类型和象征分析,对部分典型图案的图示和阐述,探讨了景颇族民族传统图案在园林中的应用形式和发展前景,为设计具有少数民族特色的园林提供思路和方法。     

库车坳陷克深地区现今地应力场及储层裂缝数值模拟

克深三维区目前处于勘探开发的前期,需要明确地应力场及地下储层裂缝的分布规律,指导开发工作,但该区存在地层埋深大、取心困难、成像测井资料缺乏等实际情况,应力场研究及裂缝预测难度大。利用有限元分析方法,以井点现今地应力值为约束进行了克深三维区现今地应力场的数值模拟,同时建立了应力应变与裂缝参数的定量关系模型,利用古今应力场结合法对克深三维区的裂缝参数进行了预测,模拟结果显示构造高部位和断层带是低应力值区及裂缝的有利发育区。裂缝的数值模拟结果与测井解释结果对比表明,预测结果与实钻吻合度较高,裂缝预测效果较好。     

Hyperspectral Models for Estimating SPAD Value of Cotton Leaves under Waterlogging Stress

[Object] To setup the hyperspectral sensing models for estimating SPAD value of cotton leaves under waterlogging stress. [Method] Irrigation and drainage controllable plots were introduced to simulate the waterlogging stress treatment in the flowering and boll forming stage, during which the change characteristics of the cotton leaf spectral reflectance and SPAD value were observed after 1 d, 3 d, 6 d, 9 d waterlogging, respectively. To find out the hyperspectral sensing models for estimating SPAD value of cotton leaves under waterlogging stress, the correlation and regression relationships between SPAD value and spectrum parameters were analyzed. [Result] (1) The SPAD value of the fourth cotton leaf from the top was significantly lower than control when suffers from waterlogging for 3 d, when waterlogged 9 d the SPAD value decreased by around 15% compared with the control. (2) The cotton suffering from waterlogged damage in the flowering and boll forming stage caused the reflection peak in green light wave band became steep, while the near infrared spectral reflectance increased, and caused the reduction of red absorption and red edge position "blue shifts", the red edge position drifts towards short wave with 4～5 nm when suffers from waterlogging for 9 d. With increase of the waterlogged days, the red edge slope and red edge area increased with a maximum value at 6 d of waterlogging, meanwhile, the skewness and kurtosis of red edge increased. (3) After waterlogging, the SPAD value of the fourth cotton leaf from the top (chlorophyll content) had a remarkable correlation with red edge slope(Dr), red edge position(λr), green peak reflection(Rg), green peak position(λg), red well position(λo), blue edge area(SDb), yellow edge skewness(Sy), yellow edge kurtosis(Ky), red edge skewness(Sr), red edge kurtosis(Kr), etc. An experience linear, polynomial and exponential models for estimating SPAD value had been built through using the Sy, Sr, Kr as independent variables, respectively, their determination coefficient (R²) were greater than 0.9, and the root mean square error (RMSE) were less than 1; and an experience binary linear regression equation for estimating SPAD value had been built through multivariate regression using the λg, SDr/SDb(VI3), Sb, Sy, Ky as independent variables, the R² was as high as 0.973, and the RMSE was 0.393. [Conclusion] The model can be remote sensing model used as estimating leaf SPAD of cotton value under waterlogging stress.     

基于结构洞指数的网络节点重要度评估

运用双阶差分模型探究了并购与新建投资模式下公司避税效应的非对称性，并进一步从事后的视角探究该非对称性是否是影响企业投资模式选择的显著影响因素。研究发现：相比于新建投资，并购增加了收购方会计利润应税所得差异，且实质性地降低了其所得税实际有效税率，这表明不同投资模式下公司避税效应存在理论预期的非对称性。进一步研究发现，改变企业会计利润应税所得差异以及会计利润应税所得操纵程度是影响企业投资模式选择的重要因素。从事后的视角来看，企业很可能为了获取更大程度的公司避税效应而选择并购行为。     

西藏地区不同作物秸秆体外发酵特性研究

本试验旨在利用体外产气法评定西藏地区不同作物秸秆的营养价值。选取西藏地区5种常见作物秸秆(豌豆秸秆、玉米秸秆、青稞秸秆、小麦秸秆、油菜秸秆),通过单因素试验设计,利用体外产气法评定5种作物秸秆体外发酵48 h的产气量、理论最大产气量(Vf)、甲烷(CH4)产量、逻辑斯谛-指数(LE)模型产气参数、发酵液p H和氨态氮(NH3-N)浓度、主要挥发性脂肪酸(VFA)产量、体外干物质降解率(IVDMD)和体外中性洗涤纤维降解率(IVNDFD)等指标。结果显示:5种作物秸秆体外发酵48 h的产气量按玉米秸秆、青稞秸秆、豌豆秸秆、小麦秸秆、油菜秸秆的顺序依次降低。体外发酵48 h后,玉米秸秆的Vf、IVDMD、IVNDFD、CH4产量(豌豆秸秆除外)、丙酸和总VFA产量均显著高于其他4种作物秸秆(P0.05),其体外发酵液p H则显著低于其他秸秆(P0.05)。结果表明,玉米秸秆体外发酵效果最佳,与其他试验作物秸秆相比更容易被瘤胃微生物降解利用。     

浅谈苄·二氯对抛栽水稻的药害及预防措施

针对当前兴业县高峰镇抛秧田应用面积最广的除草剂苄·二氯因使用不当造成水稻药害的现状,进行深入的调查研究,找出造成药害的原因,提出切实可行的预防措施。