共查询到20条相似文献，搜索用时 93 毫秒
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淀粉糖浆的挤压酶解技术 总被引：2，自引：0，他引：2
采用二次正交旋转组合试验,研究了挤压酶解法生产淀粉糖浆时挤压机参数对淀粉糖浆DE的影响规律,并采用正交试验设计对酶解挤压玉米粉的液化、糖化技术条件进行了研究。结果表明,在挤压机模孔孔径12．2～13．0mm、套筒温度64．2～70．9℃、进料含水率18．43％～19．66％和螺杆转速193～202r／min条件下对获取的挤压玉米粉进行酶解生产淀粉糖浆的酶解条件为水料比3．0mL／g、液化20min、糖化40min。在该挤压条件和酶解条件下,获取的淀粉糖浆的平均DE值为40．80％,糖液出品率及过滤性能等指标均优于对照工艺。 相似文献
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《农业装备与车辆工程》1999,(2)
为适应高层建筑消防给水稳压需求，完善工矿企业、城市生活排水．加热冷却、增压系统等场合用泵的种类，山东双轮集团研制了该系列多级消防给水稳压泵。LＤＷ系列有８个品种、１６８个规格。流量范围：Ｏ．３—５．５ｍ3／ｈ；扬程范围：１５一１７６ｍ：转速：２９５０、２８５０ｒ／ｍｉｎ；立式安装。ＬＧＷ系列有４个品种、４９个规格。流量范围：１．０—１８ｍ２／ｈ；扬程范围：１６～１８３．９ｍ；转速：２９００ｒ／ｍｉｎ；立式安装。ＤＬＷ系列有４个品种、３２个规格。流量范围：２．４—２２ｍ３／ｈ；扬程范围：肥～２０８… 相似文献
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介绍一种小型固定床移动层下吸式生物质气化炉及净化器系统的设计与试验情况，系统主要以我国水稻产区废弃的谷壳为为燃料产生可燃气，燃料消耗量为８．３ｋｇ／ｈ，气化效率为５２．６％。净化后的可燃气用于由Ｓ１９５型柴油机改装的双燃料发动机，可节约８５％以上的柴油。双燃料发动机的最大负荷可达原发动机标定工况的７０％左右。 相似文献
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厌氧—好氧法处理石化废水的研究 总被引：3，自引：0，他引：3
为考察厌氧－好氧组合技术处理石化废水的可行性,采用ＵＡＳＢ反应器和曝气池进行了处理该废水的研究。结果表明,在中温条件下,当ＵＡＳＢ进水有机负荷为５．２ｋｇＣＯＤ／（ｍ３·ｄ）,水力停留时间为２４ｈ时,ＢＯＤ５去除率８５％,ＣＯＤ去除率８３％,容积产气率１．７７ｍ３／（ｍ３·ｄ）。石化废水经厌氧处理后,其好氧可生化性提高２０％～３０％。当曝气池污泥负荷为０．４５ｋｇＣＯＤ／（ｋｇＭＬＳＳ·ｄ）,水力停留时间为４ｈ时,ＢＯＤ５去除率９４％,ＣＯＤ去除率９３％。系统总ＣＯＤ去除率９８．８％,ＢＯＤ５去除率９９％。 相似文献
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《农业装备与车辆工程》1995,(3)
该机为螺旋压榨式榨油机．它结构简单、体积小、重量轻、易安装、操作方便．适合压榨花生、大豆、棉籽、油菜籽等多种油料作物。具有坚固耐用、产量高、出油率高的特点．适用于农村中、小型油厂及专业户等进行油料加工。主要技术参数：日处理量3．5～45吨（花生）3．3～3．8吨（大豆）3.5～4．5吨（棉籽）3．5～4吨（油菜籽）干粉残油：70％～8．0％（毛生）6.5％～7.0％（大豆）6．0％～7．0％（棉籽）75％～80％（油菜籽）榨轴转达26～36转／分减速箱速13／28·13／55一19．11驱动型式型三角书传动配套动力电动机7．5～11千瓦外形尺寸（长… 相似文献
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全生育期覆膜冬小麦灌溉制度的试验研究 总被引：11，自引：0，他引：11
冬小麦全生育期覆膜是近年发展起来的一种新的栽培技术。该技术采用冬小麦穴播方式,自播种至收割的整个生育期内,地膜始终覆盖在地面。根据１９９７ 年１０ 月至１９９８ 年６ 月在东光县龙王李乡进行的灌溉试验,初步确定了冬小麦全生育期覆膜灌溉的适宜灌溉制度,在偏湿润年为：灌３ 次水（ 包括播前水） ;播前水定额根据土壤墒情确定,一般为４５０ ～９００ ｍ ３ ／ｈ ｍ ２ ;起身～拔节期的灌水定额为６００ ｍ ３／ｈ ｍ ２ ;抽穗～灌浆期的灌水定额为４５０ ｍ ３ ／ｈｍ ２ ;总灌溉定额为１５００ ～１９５０ ｍ ３ ／ｈ ｍ ２ ;试验结果表明,与不覆膜的相比,全生育期覆膜冬小麦,节水４１２ ％ ,产量提高２２８ ％ 。 相似文献
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１．２ＢＭＦ－２型马铃薯播种机 该机由辽宁省建平县农机局与县农机推广站、农机制造厂联合研制生产，现已批量投入使用。它与８．８～１１ｋＷ小四轮拖拉机配套使用，一次完成开沟、播种、施肥、覆土、镇压等多项作业，株距、行距、播深等均可调；种子破碎率≤１％；双株率≤８％；空穴率≤２％；生产率０．２６ｈｍ２／ｈ。 ２．２ＢＸＣＰ－２Ａ型双行马铃薯铺膜播种机 由河北省围场县农机技术推广站研制开发，填补了国内马铃薯覆膜播种技术的空白。试验表明，使用马铃薯地膜覆盖技术，一般可增产２０％～７０％。该机与１１～１３．２… 相似文献
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Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
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瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
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对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
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对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
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About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献
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在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
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Gunter Wriedt Marijn van der Velde Alberto Aloe Fayçal Bouraoui 《Agricultural Water Management》2009,96(5):771-789
We present a pan-European irrigation map based on regional European statistics, a European land use map and a global irrigation map. The map provides spatial information on the distribution of irrigated areas per crop type which allows determining irrigated areas at the level of spatial modelling units. The map is a requirement for a European scale assessment of the impacts of irrigated agriculture on water resources based on spatially distributed modelling of crop growth and water balance. The irrigation map was compiled in a two step procedure. First, irrigated areas were distributed to potentially irrigated crops at a regional level (European statistical regions NUTS3), combining Farm Structure Survey (FSS) data on irrigated area, crop-specific irrigated area for crops whenever available, and total crop area. Second, crop-specific irrigated area was distributed within each statistical region based on the crop distribution given in our land use map. A global map of irrigated areas with a 5′ resolution was used to further constrain the distribution within each NUTS3 based on the density of irrigated areas. The constrained distribution of irrigated areas as taken from statistics to a high resolution dataset enables us to estimate irrigated areas for various spatial entities, including administrative, natural and artificial units, providing a reasonable input scenario for large-scale distributed modelling applications. The dataset bridges a gap between global datasets and detailed regional data on the distribution of irrigated areas and provides information for various assessments and modelling applications. 相似文献
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在介绍粉质仪和拉伸仪结构和原理的基础上,探讨了粉质曲线中吸水率、形成时间、稳定时间、弱化度和评价值等指标与面粉品质的关系,以及如何根据拉伸曲线中面团最大拉伸阻力、延伸度和拉伸曲线面积等指标来评价面团品质,并结合生产实际,概述了粉质仪和拉伸仪在面粉生产中的作用。 相似文献
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车辆ABS控制算法的研究及探讨 总被引：1，自引：0，他引：1
对现代汽车的ABS控制算法作了一些简单的介绍,同时指出了它们的一些缺陷,相应地提出了几种对ABS的其它控制方法并加以探讨,其中着重论述了ABS门限值控制算法中参考车速的确定方法和基于附着系数的控制算法。 相似文献