Optimum protein and energy levels for the Thai native frog, Rana rugulosa Weigmann     

P Somsueb  & M Boonyaratpalin 《Aquaculture Research》2001,32(S1):33-38

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镁基碱金属二元合金热力学性质的理论计算     

欧阳义芳  张邦维 《湖南农业大学学报(自然科学版)》1995,22(3)

本文运用Ｍｉｅｄｅｍａ理论，系统地计算了镁与碱金属组成的二元合金系统的液态混和焓和固态合金形成焓。根据理想溶液理论，还计算了Ｌｉ－Ｍｇ系统在１０００Ｋ时的熵、以及自由能－成分曲线，所得的结果同已有的实验结果和第一原理赝势方法计算的结果符合得比较好。  相似文献   

黑龙江垦区营养状况评价的计算机实现     

于长青  陈建霞  周云波  谢银梅 《黑龙江八一农垦大学学报》2001,13(1):74-77

通过科学的膳食调查和合理的数据收集，最终整理出黑龙江垦区营养状况的原始资料，然后设计和编制计算机程序进行评价，得出全区人们的营养水平。  相似文献   

能量按自由度均分定理剖析     

刘玉清 《信阳农业高等专科学校学报》2002,12(1):76-78

剖析了能均分定理中能量按自由度均分实质上是“平均动能”按自由度均分 ,并用量子理论观点分析了该定理近似的微观机理。  相似文献   

日光能土壤高温消毒防治茄子黄萎病研究   总被引：2，自引：0，他引：2  

董灵迪  石琳琪  焦永刚  郭敬华 《河北农业科学》2009,13(8):19-21

2006～2008年连续3a对太阳能高温闷棚提高土壤耕作层温度、防治茄子黄萎病的效果以及对茄子产量的影响进行了研究。结果表明：高温闷棚可极显著提高0～20cm耕层土壤温度，使各土层温度均达到微茵核的致死温度，极显著降低茄子黄萎病的发病率，提高茄子产量。  相似文献   

长大长与杜长嵊杂交组合猪肥育效果的比较     

田爱民  周月珍 《家畜生态学报》2001,22(2):38-39

在我公司现有的饲养条件下，对40头内元猪和40头外元猪进行了肥育比较试验，结果表明长大长猪料重比2.87∶1，杜长嵊猪2.83∶1；长大长猪日增重452g，杜长嵊猪日增重460g；成活率杜长嵊猪100%，长大长猪95%；；杜长嵊猪的肉质等级也比长大长猪略高。  相似文献   

新疆米泉县电力井灌节能节水初见成效     

马楫  董新光  李守孝 《新疆农业大学学报》1988,(4)

米泉县电力提水灌溉所消耗的能源约占农用动力的80％以上,能源浪费惊人。本文就此问题在机井普测的基础上,采取以综合维修保养为主,并对高扬程的潜水电泵运用变径,变级等改造措施,提出了节水节能的途径,达到少花钱,节能效果显著的目的。  相似文献   

Phänotyp und Futterqualitat einschliefilich Konservierungseigenschaften bei Grasern     

W. Opitz  VON Boberfeld 《Journal of Agronomy and Crop Science》1994,172(5):289-304

Phenotype and forage value, including conservation properties, of grasses The phenotype of grasses can be influenced by the date of harvest as well as by breeding programs. In contrast to dicotyledons, the stems of grasses are younger than the leaves, although the grass leaves are usually considered to have a higher nutritional value than the stems. In a field experiment, Lolium multiflorum Lam. ssp. gaudini (Parl.) Schinz et Kell. was grown as a model-plant in order to study effects of ploidy-level, N-fertilization, stage of development, and growth time on the main aspects of nutritional value and conservation properties in relation to the phenotype. As regards the nutritional value, the interactions of ploidy × plant organ (=stem or leaf) and of ploidy × N-input were not significant. Hence, the results for leaf and stem can be generahzed. Until the emergence of the inflorescence, EC 49, the stem showed a significant higher net energy content than the leaf; at later stages of development this relationship changed. The evaluation of the net energy content of leaf and stem was significantly influenced by the method of estimation. In vitro methods with rumen liquor may show the best approximation to the real value. The crude protein/energy ratio of the stem as compared to the leaf better meets the nutritional requirements of ruminants; on the other hand the leaf was more valuable than the stem in relation to the nitrate content, especially when the whole plant showed an increased nitrate level. The general relationship between the mineral content and the phenotype was not evident. The investigation indicated significant differences between stem and leaf in relation to their conservation properties. The leaf showed more favourable drying properties than the stem but ensilability was better for the stem than for the leaf. As a result of this investigation it is assumed that, in the past, the nutritional value of young stem has been underestimated whereas the value of the leaf has been overemphasized. This may also be due to the criteria and determination methods of the nutritional value.  相似文献   

白三叶草营养动态的研究   总被引：17，自引：3，他引：14  

胡迪先  封朝壁 《草业学报》1994,3(2):44-50

影响白三叶草营养成分的因素有品种，不同收割时期，不同部位─—茎和叶，不同海拔高度等。本文就影响白三叶草营养价值的各种因素进行了探讨。  相似文献   

基于虚拟仪器的气力输送能耗参数检测     

何卿  钱东平  杨世凤 《河北农业大学学报》2003,26(4):93-97

气力输送应用广泛，但存在着能耗高等缺陷。应用虚拟仪器技术可实现气力输送能耗参数的自动检测。检测系统的硬件包括气力输送装置、孔板、压差传感器、扭矩传感器、变频调速器、可控硅、数据采集板等。系统软件应用Lab Windows／CVI实现数据的分析、计算和处理，得出检测试验的回归方程。基于虚拟仪器的气力输送能耗参数检测系统可显示能耗指标与其参数的关系曲线，并得出能耗最小时的最佳参数组合。  相似文献