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浇水因子对强筋小麦产量和品质的影响 总被引：2，自引：1，他引：1
为使优质强筋小麦品种配套栽培,充分发辉优良品种的特性,提高优质商品率,达到高产高效的目的。经过不同浇水时期及浇水次数对强筋小麦产量和品质的影响研究,研究结果表明：浇水时期和浇水次数对小麦产量和品质有直接关系,随浇水次数的减少产量呈下降的趋势,全生育期浇5水产量最高7593.0kg/hm2,拔节期不浇水产量最低7353.0kg/hm2。全生育期浇5水（其中浇麦黄水）籽粒蛋白质含量（13.4%）、湿面筋含量（33.6%）最低、稳定时间最短8.7min,浇2水（拔节、灌浆）蛋白质含量16.3%、湿面筋含量35.5%、稳定时间（9.6min）等综合品质指标较好。研究表明：强筋小麦拔节期不浇水产量减产显著,浇麦黄水蛋白质含量、湿面筋含量、稳定时间明显下降,浇越冬水、拔节水、灌浆水3水或浇拔节水、灌浆水2水可兼顾产量和品质,达到高产优质高效的目的。 相似文献
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为明确沧州地区水分对产量及农艺性状的影响,搜集黄淮北片的18个小麦品种进行春季灌水处理,利用室内和田间调查等方法,分析了灌水次数对不同品种的茎蘖动态、叶面积系数、产量等性状的影响。研究表明:浇1水比浇0水的处理平均增加产量1021.05 kg/hm~2;浇2水比浇1水的处理平均增加产量900.00 kg/hm~2。在灌浆期对小麦各品种的旗叶叶面积调查发现,0水的叶面积最小,平均为18.15 cm~2,浇1水的叶面积为20.34 cm~2,浇2水的叶面积最大为24.05 cm~2。随着浇水次数的增加,各品种的容重有所下降,不孕小穗数下降,株高逐渐增大。该研究认为在沧州地区每少浇1水,产量损失900.00 kg/hm~2。 相似文献
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以稻谷为原料,对蒸谷米的复水性进行了研究。通过单因素试验,探讨超高压浸泡工序、蒸煮工序、干燥工序中相关参数的影响规律,并以蒸煮时柠檬酸添加量、蒸煮次数、微波干燥时间为变量,成品复水率为指标,通过响应面分析建立回归方程,得出蒸煮次数对复水性影响最大,柠檬酸添加量次之,干燥时间影响最小。利用模型确定了较佳参数为柠檬酸添加量1.1%,微波干燥时间6.4 min,蒸煮次数3次。 相似文献
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为研究水提醇沉工艺中不同提取条件对黄精多糖提取率的影响,以优化黄精多糖提取工艺。在单因素实验的基础上,通过四因素三水平正交实验确定工艺参数,紫外分光光度法测定黄精多糖含量。研究表明：温度对提取工艺有极显著影响,提取时间提取工艺有显著影响,提取次数和物料比对提取率影响不大。说明黄精多糖最佳提取工艺条件为：固料比1:15,提取温度90℃,提取时间4 h,提取1次黄精多糖的得率可达3.2248%。 相似文献
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采用一次发酵法工艺,研究蒲公英用量以及pH值、和面时间、轧面次数、醒发时间等生产工艺条件对蒲公英保健馒头品质的影响。结果表明,在1kg面粉中加入20g蒲公英的浸提液来代替水进行和面,得到的馒头品质较好;在单因素试验的基础上进行正交试验,确定蒲公英馒头的最佳制作工艺条件为和面时间15min、轧面次数15次、醒发时间45min、pH值6．6。 相似文献
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以榴莲为原料、蒸馏水为提取剂,研究料液比、提取温度、提取时间、提取次数对榴莲多糖提取含量的影响,并通过单因素试验、正交试验和验证重复性试验,确定榴莲多糖的最佳提取工艺为料液比1∶30,提取温度80℃,提取时间1.5 h,提取次数2次。在此条件下,榴莲多糖的含量为31.26%。 相似文献
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为了优化银翘天甘含药血清的制备工艺,在单因素试验的基础上,选取采血时间、给药次数及给药浓度为自变量,以小鼠血清中绿原酸和连翘苷含量的综合评分为响应值,采用响应面分析方法,研究各自变量及其交互作用对综合评分的影响。利用Design-expert软件分析得到二次多项式回归方程的预测模型,并确定了银翘天甘含药血清最佳制备工艺条件为：采血时间30 min、给药次数4次、给药浓度0.02 g/mL,理论计算综合评分为95.62%,小鼠血清中绿原酸浓度为33.65 μg/mL,连翘苷浓度为193.86 μg/mL。该研究为银翘天甘含药血清的制备奠定了基础。 相似文献
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近10年尺度成都市空气污染指数变化小波分析 总被引：2，自引：1，他引：1
为了找出成都市空气污染的变化规律与影响因素,为空气污染治理提供依据。基于一维连续Meyer小波,对2000年6月底以来近10年成都市逐日空气污染指数(air pollution index, API)的时间序列进行小波分析,得到该市API时间序列的多尺度变化特征、主周期,对影响因素进行了分析。结果表明：成都市API“高—低”交替演化规律明显,主周期约320天,次周期约120天;受盆地地形与气候等条件影响,大气污染呈“冬重夏轻”格局,春季污染次高峰常伴随北方沙尘暴而产生;成都市10年来大气污染状况总体趋向于好转,但局部时段污染加重的现象时有发生。结果表明,小波变换分析对于研究API时间序列的变化规律非常有效,也适用于其他污染物的时间演变规律的研究。 相似文献
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Calculation model for the turnover number of steel ladle based on casting schedule 总被引：1，自引：1，他引：0 
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下载免费PDF全文 In order to realize optimization of production organization and put forward a reasonable calculation model for the turnover number of steel ladle, the turnover process and time of steel ladle are analyzed with steel ladle of Q steelmaking plant. Gantt charts of steel ladle turnover for single casting schedule and double casting schedule are drawn. Calculation model for turnover number of steel ladle is put forward by analyzing the relationship between casting schedule and the turnover time of steel ladle, and the accuracy of the model is verified by simulation method. Researches show that the turnover number of steel ladle can be reduced 1-2 by adjusting cast starting time, and have significance for the optimization of steel ladle production organization. 相似文献
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CHEN Deng-fu SUN Ming-yue FENG Ke ZHAO Zhan-feng DONG Ling-yan WEN Liang-ying PAN Yan-hua 《保鲜与加工》2004,(9):67-71
A numerical simulation commercial software has been developed by the object-oriented Visual Basic programming language on the basis of the 2D mathematical model of secondary cooling Process in billet continuous casting. Thereby an effective experimenting tool for computer simulation of continuous casting process is gained. By simulation with the software, the caster structures and operating parameters in continuous casting can be designed and optimized. The simulating calculation examples on several casters and its production applications indicate that the commercial software developed has more accuracy, practicability and commonality, as also as simpler operating capability. The simulated results have been successfully applied to the design and production of the high-efficiency modification for several billet casters interiorly. 相似文献
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HE La-mei~ 《保鲜与加工》2004,(5):57-61
To solve potential scheduling problems in production after renewal of continuous casting process in Vanadium-extracting and Steel-making Plant of Panzhihua Iron and Steel Corporation (PISCO), how to model and simulate logistics system in steel-making processhas been discussed. A series of simulatingtests for logistics system in steel-making processhave been conducted based on inputs of presentsteel-making processof PISCO. In the tests, cases of regular schedule case and cases with repairing converter have also been regarded as essential simulation condition. It has been shown that three casters can not start at same time in order to ensure continuous hot metal supply for casters when three kinds of steel are made. It has also been shown that the simulation system for logistics system in steel-making processis valid and can be used for simulating logisticsin upcoming 100% continuous casting process of PISCO. The better schedule scheme of production and reasonable match of converter-caster in time and capacity can be achieved with the help of using simulation approach. 相似文献
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为了研究钢箱-砼组合结构中PBH剪力键在反复荷载作用下的疲劳性能,设计制作了PBH剪力键试验模型,进行了24万次疲劳推出试验。在疲劳破坏形态和试验滑移及应变数据分析的基础上,利用数值工具开展肋板开孔孔径、穿入钢筋直径、混凝土强度3个参数的PBH剪力键疲劳寿命影响因素分析。研究表明：PBH剪力键的疲劳破坏形态与静载破坏相似,表观表现为混凝土面多处斜向劈裂裂缝、内部榫孔混凝土压碎、穿入钢筋局部屈服;疲劳破坏演化过程分为疲劳损伤开始、发展、破坏3个阶段,其中疲劳发展阶段占整个疲劳阶段的91.7%,结构刚度在疲劳损伤开始和发展阶段退化较慢,在疲劳破坏阶段退化较快;肋板开孔孔径、穿入钢筋直径、混凝土强度3个参数对PBH剪力键疲劳寿命影响均有明显影响,其中穿入钢筋直径对疲劳寿命的影响尤为突出。 相似文献
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Fluid flow and temperature distribution in a wide slab continuous caster mold are simulated using the commercial software FLUENT. The research results show that the longitudinal cracks in the wide slab surface with an original submerged entry nozzle (SEN) mainly are caused by weak upper flow circulation in the mold, slow heat exchange near the meniscus, and non uniform melting of the mold powder. Therefore, a modified SEN with smaller outlet thickness, a 15° downward port angle, and convex bottom is designed to overcome the disadvantages of the original nozzle. The characteristics of the molten steel flow are analyzed by numerical simulation. The results indicate that the parameters of the optimum SEN are more highly optimized than the original SEN. The trial results also show that the optimum SEN possesses a better application effect. 相似文献
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In order to increase decision accuracy of the intermixing slab length and position, and decrease the slabs which are offgraded or scrapped. Water model experiments were conducted to simulate the continuous casting grade transition process of No. 2 continuous caster at Bao Steel. The dimensionless concentration profiles along slab length with different continuous casting conditions were measured. Based on the profiles a mathematical model was developed to predict the final composition distributions and length of intermixing slab. Comparison of predicted dimensionless concentration profile with plant data shows that the precision of the model is considerably satisfied to meet the need of steel grade transition evaluation. 相似文献
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LIU Lin-fei LIU Shou-pin ZHOU Shang-qi REN Qin LI Ding KANG Ren-mu WU Wen-dong 《保鲜与加工》2006,(2):72-75
In order to improve the quality of the products and the pure degree of the steel; the type, quantity, size, composition and distribution of the nonmetallic inclusions present in continuous cast slabs made by Weiyuan Iron and Steel Co. , Ltd. are investigated with optic microscope, SEM, XES and Electroanalysis. Moreover the original of the inclusions is discussed. The result shows the inclusion in the continuous cast slab is mainly the spherical silicate inclusion which is smaller than 10 um. There is a small amount of polygonal inclusions, and there is the single-phase one and heterogeneous inclusion too; And the inclusions assemble in 1/3 position and in 1/4 at board base thickness and width direction. The inclusions are ineral, which origin from the deoxidizing process of molten steel. 相似文献
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电网发生大面积冰灾情况时,多条输电线路存在覆冰故障隐患,电网稳定运行受到严重威胁,需要提前制定输电线路融冰方案,合理安排融冰顺序。针对此问题,分析输电线路覆冰继续运行给电网带来的停电风险,将与待融冰输电线路相关联的变电站的电气主接线展开,将传统削负荷模型改进后应用于输电网与变电站主接线的组合网络,建立断路器可靠性模型,计算靠后融冰线路因继续运行的电网停电风险;利用计及风速及降雨影响的输电线路覆冰增长预测模型,计算输电线路的覆冰率,根据覆冰率门槛值确定待融冰线路集,基于覆冰严重度模型构建系统全局的覆冰指数指标;综合考虑电网停电风险及系统全局覆冰指数建立输电线路融冰紧迫度指标,动态更新待融冰线路并决策融冰顺序。最后,以IEEE RBTS系统进行算例分析,验证了所提方法的可行性与合理性。 相似文献
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Using precise design principle, a multi-objective programming mathematical model of the BOF-Caster matched is established for single production line in the steelmaking plant of all plate and strip, according to the segmentation of steel grade and product specification of product mix. Objectives of the model have less investment, less difference between production capacity of the converter and continuous caster, higher operating rate of converter and higher level of weighted average casting speed. The model is solved by the improved delaminating sequence method. Then, the overall configuration method of BOF-continuous casting in the steelmaking plant is proposed through integrating single production lines. According to the production outline of a new large steel plant, the result of the model shows that the configuration scheme of the steelmaking workshop of the steel plant is a better design scheme. 相似文献