Real-time Performance of Linux System

The standard Linux is a typical time-sharing system, it has a poor real-time performance. But according to the applications of the Linux OS are expanding on real-time domain, it becomes necessary to enhance the performance of the Linux system. This paper analyses the schedule policies and schedule algorithms of the Linux kernel, and discusses several different kinds of methods about enhancing real-time performance of the Linux system from the total Linux system. They authors summarizes the current research's developments of the Linux system.     

卫星遥感数据在森林采伐监测中的应用

分别采用SPOT5、TM5影像前后两期多光谱遥感影像的波谱特征变化,检测森林资源变化信息,确定变化类型,以计算机自动识别对森林资源变化(减少)的区域(伐区)进行信息提取,并在此基础上进行室内人工预判读;结合采伐证、伐区作业设计、二类调查材料,进行补充判读,得出森林采伐图斑。古丈TM5(30 m分辨率)的面积正判率为96.3%;古丈SPOT5(10 m分辨率)的面积正判率为96.9%。实证分析表明,使用中、高分辨率卫星遥感数据能对森林采伐进行监测,结合辅助材料后能显著提高森林采伐监测精度。     

基于流变特性分析的菠菜有序收获机夹持输送装置研究

针对菠菜有序收获夹持输送过程中极易出现挤压损伤的问题,基于菠菜植株的流变特性对夹持输送过程中工作参数对损伤的影响进行了研究。首先提出了一种菠菜夹持输送装置,阐述其工作原理和机械结构,分析了浮动夹持机构与菠菜植株的互作关系;通过Burgers粘弹性模型构建了菠菜植株夹持输送作用下的流变本构方程,利用菠菜植株的蠕变试验,确定流变本构方程系数;在不考虑弹性变形和粘塑性变形前提下求得菠菜塑性变形表达式,并将菠菜塑性变形量作为衡量菠菜机械损伤程度的评价指标;选择对损伤影响较大的夹持轮当量弹性系数和输送速度,分析其对菠菜塑性变形量的影响,得到最小塑性变形下的作业条件;选取输送速度和当量弹性系数三水平的5组参数组合进行分析研究,得到不同参数组合下的夹持输送过程中夹持力与时间的关系方程,以菠菜最小塑性变形量为目标,实现低损伤收获。为了验证用菠菜流变特性分析工作参数对菠菜损伤影响的可行性,进行了夹持输送试验,试验结果表明:当输送速度为25 mm/s、当量弹性系数为2 N/mm时,输送成功率为93. 3%,菠菜损伤率为6. 7%,夹持输送效果较好。     

不同栽培树形对油橄榄品种果实产量的效应

Longnan City in Gansu Province is the largest base of olive production in China. In the olive orchard locating in Wudu District of Longnan City, thirty trees were sampled each of three cultivars, ‘Leccino’, ‘Chenggu32’, ‘Ezhi8’, with monoconical and vase training system. After planted with density of 5×6 m in 1992, each sample tree was investigated to determine the yield fresh fruit in five different years. The results of survey and analysis showed that there were significant differences of fruit yield among 5 years and 3 cultivars. Different canopy shapes yielded some effect on fruit setting rate and yield of different cultivars in different years. During first fruiting period in the fourth/sixth year after planting, fruit setting rate and yield of ‘Leccino’ with monocone were more 6.7% and 0.15 kg than those with vase and those of ‘Ezhi8’ and ‘Chenggu32’ with vase were more 20%, 10% and 0.18 kg, 0.09 kg than those with monocone. With the increase of tree age, fruit set and yield of ‘Leccino’ and ‘Ezhi8’ with vase was more than those of monocone. In 2011, average yields per tree of ‘Leccino’ and ‘Ezhi8’ with vase were more 13.35 kg and 6.85 kg than those with monocone. And the highest yield per tree of ‘Leccino’ with vase was 75 kg, more 16 kg than that of monocone. Fruit trees with yield over 35 kg of ‘Leccino’ and 25 kg of ‘Ezhi8’ with vase accounted for 80% and 46.7%, more 40% and 30.01% than those of monocone. It was concluded that vase training system would produce higher yield of ‘Leccino’ and ‘Ezhi8’ and its effect and advantages were gradually prominent with increase age. As for ‘Chenggu32’, monocone got a slightly higher yield than that of vase and in 2011 fruit trees with yield over 15 kg accounted for 25%, more 8.34% than vase. The difference between two training system of this cultivar was not obvious.     

巴东皱皮木瓜发育及主要成分的变化分析

以湖北巴东产的皱皮木瓜为试验材料,分别在皱皮木瓜果实7个不同生长期采样,通过果实颜色、纵横径、鲜果质量等形态特征的测定,并采用HPLC法对不同生长期内的有效成分(齐墩果酸、熊果酸、原儿荼酸、绿原酸)进行检测,综合评价皱皮木瓜最佳的采收季节和质量指标.结果 表明:(1)皱皮木瓜的纵径、横径、鲜果质量增长随生长阶段呈逐渐递...     

宁夏干旱风沙草原区紫花苜蓿地下滴灌水肥耦合试验研究

针对宁夏干旱风沙草原区紫花苜蓿地下滴灌灌溉制度、水肥协同效应不明确的问题。通过田间试验,对不同水肥组合下地下滴灌紫花苜蓿株高、土壤水分、产量及水分生产效率等指标进行综合分析,结果表明,处理D11条件下地下滴灌紫花苜蓿生长状况较好。研究提出了宁夏干旱风沙草原区苜蓿地下滴灌水肥耦合灌溉制度为:灌溉定额为3150m3/hm^2,灌水次数为12次,施肥量N为90kg/hm^2、P2O5为126kg/hm^2、K2O为108kg/hm^2。     

Effect of Conditioning Zinc Sulfate Heptahydrate (ZnSHH) with Zinc Oxide (ZnO) and Neem Oil on Growth,Productivity, Zinc Biofortification of Grain and Zinc Uptake by Basmati Rice

Commercial grade zinc (Zn) sulfate hepta hydrate (ZnSHH) is the most widely used source of Zn in India and several other countries for amelioration of Zn deficiency in crops. However, it releases water of hydration at temperature above 30°C and forms lumps on storage, which make it difficult to handle it and apply in fields. Therefore, conditioning of ZnSHH with ZnO and neem oil reduces the release of water of hydration and prevents lumps formation and can be well stored. Field experiments were conducted at the research farm of the Indian Agricultural Research Institute, New Delhi, India during rice growing seasons (July-November) of 2009 and 2010 to study the effect of conditioning ZnSHH with ZnO and neem oil on growth, productivity and Zn fortification of rice (Oryza sativa) grain and uptake by Basmati rice ‘Pusa 1121’. The experiment was conducted in a randomized block design with 3 replications comprised of 9 treatments of Zn fertilization. The present study shows that when conditioned with 2% ZnO and 4% neem oil ZnSHH improved yield attributes, grain and straw yields, Zn uptake and partial factor productivity (PFP), agronomic efficiency (AE), recovery efficiency (RE), and physiological efficiency (PE) of Zn in Basmati rice ‘Pusa 1121’. In general, ZnO was inferior to ZnSHH. Application of ZnSHH conditioned with 2% ZnO and 4% neem oil can be a better source of Zn for transplanted puddled Basmati rice on Zn deficient soils.     

凤丹牡丹花粉和花药壁营养成分分析及评价

为探明凤丹牡丹花粉、花药壁的营养成分,从而更好地发挥其营养价值,本研究采用凯氏定氮法、电感耦合等离子体发射光谱、高效液相色谱、氨基酸分析仪等对凤丹花粉和花药壁蛋白质、矿物质元素、维生素C、水解氨基酸及游离氨基酸进行了系统地分析和评价。结果表明,凤丹花粉中蛋白质含量高达40.68%(初开期),水解氨基酸总量为355.65 mg·g^-1(初开期),花药壁中蛋白质和水解氨基酸的总量虽仅为花粉的一半,但二者必需氨基酸与总氨基酸的比值均为40%左右,属优质蛋白来源。36种游离氨基酸检测结果显示,花药壁中总游离氨基酸含量稍高,但花粉中必需氨基酸、蛋白氨基酸及鲜甜氨基酸含量更高。矿物质元素分析结果表明,凤丹花粉、花药壁含有丰富的常量和微量元素,尤以K、Ca、Mg、Fe、Zn等元素含量较高,是开发高钾低钠和补铁补锌的佳品。Vc测定结果显示,凤丹花粉和花药壁中Vc含量较高,可作为Vc补充剂。同时考察了凤丹花粉、花药壁不同采收时期及破壁对检测成分含量的影响,结果显示二者更适合在初开期采收,且破壁对花粉、花药壁营养成分检测无显著影响。综上,凤丹花粉、花药壁含有丰富的营养成分,本研究将为...     

GENETICALLY MODIFIED AND CONVENTIONAL DRY BEAN GENOTYPE RESPONSES TO SOIL FERTILITY

Dry bean is important pulse for the diet of South American population and results related to comparison of genetically modified and conventional dry bean genotypes to soil fertility are limited. A greenhouse experiment was conducted to compare genetically modified and conventional dry bean genotypes to soil fertility. Genotypes evaluated were Olathe Pinto, Olathe 5.1 (genetically modified), BRS Pontal, BRS Pontal 5.1 (genetically modified), Pérola and Pérola 5.1 (genetically modified). Fertility levels were 1 g fertilizer (5-30-15) kg^?1 soil (low fertility level) and 2 g fertilizer (5-30-15) per kg soil (high fertility level). These fertility levels were designated as low and high, respectively. Grain yield, number of pods per plants, and seed per pod were significantly increased with the increase in soil fertility. Shoot dry weight, seed per pod, and 100 seed weight were also significantly influenced by genotype treatment. Fertility X genotypes interaction was significant for maximum root length and root dry weight, indicating genotypes responded differently at two fertility levels in relations to these two traits. Shoot dry weight, number of pods per plant, and grain harvest index had significant association with grain yield, indicating that increase in these three traits grain yield can be increased. Grain yield efficiency index (GYEI) was having significant linear association with grain yield. Hence, on the basis of GYEI, genotypes were classified as efficient (E), moderately efficient (ME), and inefficient in nutrient use. Three conventional genotypes (Olathe Pinto, BRS Pontal and Pérola) and one genetically modified genotype (Olathe Pinto 5.1) were classified as moderately efficient and two genetically modified genotypes (Pérola 5.1 and BRS Pontal 5.1) were classified as efficient. None of the genotypes fall into the inefficient group.     

制取淀粉用甘薯的最佳收获期及磨浆分离机的研究

通过对河北省甘薯集中产区“一窝红”和“卢选1号”两个具有代表性的甘薯品种,在不同收获时间甘薯淀粉亩产量的试验测定,确定出该区甘薯用来制取淀粉的最佳收获时间。同时,为在甘薯最佳收获时间内制取淀粉,提高甘薯淀粉的亩产量,研究设计了适合甘薯集中产区的6SF-20型薯类磨浆分离机。该机的淀粉分离率为96.4%,淀粉提取率为92.0%,达到国际先进水平