小型水利工程质量管理现状及建议     

索菲燕  王永进 《现代农业科学》2009,(3):159-160

随着霍城县农业基础设施建设资金投入的不断加大，小型农田水利工程作为农业生产中重要的基础设施之一。在发展节水型农业，抵御水、旱灾害中发挥了重要作用。其特点是：单体建筑规模小，兴建数量多，分布面积广，结构相对简单。就因其有着特殊性，工程质量管理常常不被重视，存在的问题和隐患较多。笔者就如何搞好霍城县小型农田水利工程质量管理提出了几点建议。  相似文献   

磨料水射流切割质量研究   总被引：1，自引：0，他引：1  

接志波 《青岛农业大学学报(自然科学版)》2009,26(3):239-241

对磨料水射流的切割质量进行了试验研究,通过改变水射流压力、切割进给速度来研究切割断面质量,对AWJ切割机理和切割过程进行了分析,探讨了AWJ切割断面的形貌特征及其形成机理,认为是射流断面磨料动能的分布不均和射流的偏转滞后造成了AWJ切割断面斜条纹和曲线及尖角处的尖端,提出了两种提高磨料水射流切割质量的方法。  相似文献   

Vineyard Compost Supplemented with Trichoderma Harzianum T78 Improve Saline Soil Quality     

《Land Degradation \u0026amp; Development》2017,28(3):1028-1037

Understanding soil degradation is especially important in the Mediterranean Region where desertification is a serious problem, and soil salinization is one of the causes. Salinity reduces soil quality, limits crop productivity and brings on long term soil degradation. Therefore the restoration of degraded soils is necessary to reduce land degradation, improve soil fertility and achieve a sustainable food production. The addition of compost supplemented with the beneficial microorganism Trichoderma harzianum isolate T78 to saline soils (NaCl) was studied to determine the impact on soil microbiology, which is the key to restore and rehabilitate degraded soils. The selected Trichoderma harzianum isolate T78 showed high salt tolerance despite the low osmotolerance of the genus Trichoderma . Increasing salt concentration reduced Trichoderma sp colony‐forming units (CFU) from natural soil and adversely affected soil microbial biomass C as well as dehydrogenase, β‐glucosidase, phosphatase and urease activities. Simultaneous amendment of the saline soil with compost and inoculation with T. harzianum T78 improved the soil microbiological quality; the number of T. harzianum T78 CFU did not decrease as NaCl increased. As T. harzianum strain T78 is salt tolerant, increasing the relative abundance of this specific strain would contribute to the rehabilitation of saline soils. Vineyard composts supplemented with T. harzianum T78 represent a promising approach for the treatment and improvement of saline soil properties. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

提高新时期高校办公室秘书素质的基本要求     

陈思泽 《四川畜牧兽医学院学报》2009,(1):211-213

新时期高校办公室秘书应从具备合适的知识结构体系、加强政治修养、改进工作作风、注重培养和锻炼各种工作能力等方面入手，通过学习和实践，使其达到提高自身素质的目的。从而在完成新时期赋予高校的重大历史使命中，发挥自己的作用，作出应有的贡献。  相似文献   

Effects of phenyllactic acid on production performance,egg quality parameters,and blood characteristics in laying hens     

《The Journal of Applied Poultry Research》2009,18(2):203-209

Organic acids have been widely used as feed additives to replace antibiotics in livestock feeds. Data on the use of phenyllactic acid (PLA) are lacking. The effects of PLA on production performance, egg quality parameters, and blood characteristics in laying hens were studied in a 35-d experiment. A total of 240 ISA Brown 36-wk-old layers were divided into the following 4 treatments: 1) control (basal diet), 2) control + 0.1% PLA, 3) control + 0.2% PLA, and 4) control + 0.3% PLA. Although supplementing the diet with PLA did not affect ADFI and FE, it linearly improved egg production rate, eggshell breaking strength, and Haugh units. Egg weight, eggshell thickness, and egg yolk color were not significantly altered by supplementing the diet with PLA. White blood cell, red blood cell, total protein, and albumin concentrations were higher in the control + 0.1% PLA and control treatment groups (P < 0.05), whereas the groups fed the control + 0.2% PLA and control + 0.3% PLA diets had greater (P < 0.05) lymphocyte concentrations. In conclusion, PLA may exert some positive effects to the immune system and egg production over the short term. It may be beneficial to supplement the diets of laying hens with PLA in the absence of antibiotics. This experiment involved a small experimental sample and a short time, so the beneficial effects of PLA should be studied further in commercial farms over the long term.  相似文献   

皖Ⅲ系长毛兔系统选育中产毛性能的研究   总被引：1，自引：1，他引：0  

赵辉玲  朱秀柏 《中国养兔杂志》1995,(6):14-19

皖Ⅲ系长毛兔是在皖系粗毛型长毛兔的基础上，又经５个世代的继代选育而成。据五世代测定：其１１月龄产毛量达２５３．１９克；１１月龄粗毛度１５．１４％，参加繁殖１－２胎的周岁成年母兔的粗毛率达１７．５８％。１１月龄产毛量和粗毛率分别较皖系粗毛兔提高２２．５９％和１０．５９％。１１月龄毛纤维的长度、细度、强度及伸度，其粗毛分别为１１．４９ｃｍ、４５．１２μｍ、２３．４７克和４６．７２％，细毛分别为７．４０  相似文献   

Effect of Weather and Soil Conditions on Yield Components and Bread-Making Quality of Winter Wheat (Triticum aestivum L.) and Winter Triticale (Triticosecale Wittm.) Varieties in North-East Germany     

O. Erekul  W. Köhn 《Journal of Agronomy and Crop Science》2006,192(6):452-464

The reduced nutrient and water availability of the sorption‐weak silty sand soil in Thyrow when compared with the loamy sand soil in Berge enhanced the negative effects of unfavourable weather conditions. Winter wheat reacted to weather conditions and soil quality substantially more sensitively than winter triticale, so that the cultivation of wheat on very light sandy soil is combined with a higher risk. Reduced yields resulting from site differences are, for both cereals, mainly a result of reduced ear densities. Low grain yields as in the dry year 2003 led to high crude protein contents, this being more pronounced for winter wheat than for triticale and on the poor silty sand soil in Thyrow to a greater degree than on the loamy sand soil in Berge. For the starch content the contrary holds true. Grain yields were, to a greater extent, decisive for the protein and starch yields than the content values. For both cereals, the sedimentation value, the wet gluten value, the gluten index and the falling number resulted in principally higher values in the dry year 2003 and on the loamy sand soil when compared with the wet year 2004 and the silty sand soil. Only the wet gluten content was not clearly influenced by soil quality. All parameters describing bread‐making quality are clearly lower for winter triticale than for winter wheat. Especially, the falling number was not satisfactory, so that the tested triticale varieties seem only to be suitable for bread‐making by mixing with wheat flour. The internal grain quality of winter wheat varieties is extensively genetically determined. Weather and soil‐induced variations in the quality parameters were, with only few exceptions, greater for winter wheat than for triticale.  相似文献   

Histochemical properties of skeletal muscles in Japanese cattle and their meat production ability     

Takafumi GOTOH 《Animal Science Journal》2003,74(5):339-354

The compositional characteristics of the three basic types of myofiber, namely type I (slow‐twitch oxidative), type IIA (fast‐twitch oxidative glycolytic) and type IIB (fast‐twitch glycolytic), are clarified in the skeletal muscles of Japanese Black cattle. The myofiber composition, which is characteristic of the muscles of Japanese Black cattle, markedly changes during their growth, when some type IIA myofibers are transformed into type I or IIB, depending on the different muscles. Independent of these changes with growth, inter‐ and intramuscular variations of myofiber type distribution is evident. The small extensor muscles in deep regions around bone contain a lot of type I myofibers, whereas the large muscles at surface regions have many type II myofibers. Japanese Black cattle have typical white muscles such as the Longissimus thoracis and Semitendinosus, containing half the myofibers as red (type I + IIA). The muscles of Japanese Black cattle show a tendency to contain a higher percentage of type I myofibers than other breeds over an intrabreed variation of the myofiber type composition. In the big muscles such as the Longissimus thoracis and Biceps femoris, a great diversity of myofiber type composition is observed among the different regions. When fattened, heifers produce Longissimus thoracis and Biceps femoris muscles of smaller weight than steers, but in heifers the myofiber size in each type is rather larger. In the Psoas major, Vastus lateralis and Serratus ventralis muscles, heifers contain a higher frequency of red (type I + IIA) myofibers with no differences in myofiber size. Among the several muscles of fattened Japanese Black steers, the percentage distribution of type I myofibers has a positive correlation with the percentage amount of intramuscular fat. From these results, the high potential of Japanese Black cattle to produce marbled beef could be based on the histochemical properties of myofibers in their skeletal muscles.  相似文献   

水稻栽培因素对北方粳稻产量及米质的影响[Ⅵ]--穗肥追肥时间对产量及米质的影响     

严光彬  李彦利  孟令军  王万成  贾玉敏  严永峰 《北方水稻》2005,(3):20-21

通过田间对比试验研究穗肥追施时间对水稻产量及米质的影响,结果表明,水稻的穗肥追施时间越晚,加工品质越好,而产量和食味品质明显降低.这种趋势以出穗前25 d为准,有跳跃式的质的变化.所以为了提高产量和增加食味品质,水稻的穗肥追肥时间不应晚于出穗前25 d.  相似文献   

我国独立审计质量的经济学分析     

万宇洵  任志能  张鹏 《湖南农业大学学报(自然科学版)》2005,(1)

我国独立审计市场存在的种种问题表明 ,我国审计市场环境较差、审计质量较低。其原因在于独立审计市场上存在的审计供给和需求的深层次矛盾。本文从信息经济学角度分析我国独立审计市场上的供需双方的博弈关系后 ,认为只有处理好供需双方的矛盾 ,才能较好地解决问题  相似文献