高效节水灌溉管道流量计算原则初探     

覃通  李鸣 《节水灌溉》2015,(5)

对于管网优化及投资分析来说,最不利情况下的水力条件不是普遍条件,不能够完全代表管网应当有的优化假定条件。通过管道控制灌溉面积来确定管道的流量,按照满足在一天内,管道控制的所有灌水器都灌溉一次的原则确定,并给出公式。让管道的流量这一重要参数,在高效节水灌溉工程优化和设计计算中变得简单并容易计算。  相似文献   

Effects of water‐misting sprays with forced ventilation on post mortem glycolysis,AMP‐activated protein kinase and meat quality of broilers after transport during summer          下载免费PDF全文

Nannan Jiang  Tong Xing  Minyi Han  Shaolin Deng  Xinglian Xu 《Animal Science Journal》2016,87(5):718-728

Effects of water‐misting sprays with forced ventilation on post mortem glycolysis, adenosine monophosphate‐activated protein kinase (AMPK) and meat quality of broilers after transport during summer were investigated in the present paper. A total of 105 mixed‐sex Arbor Acres broilers were divided into three treatment groups: (i) 45 min transport without rest (T); (ii) 45 min transport with 1 h rest (TR); and (iii) 45 min transport with 15 min water‐misting sprays with forced ventilation and 45 min rest (TWFR). Each treatment consisted of five replicates with seven birds each. The results indicated that the water‐misting sprays with forced ventilation could mitigate the stress caused by transport under high temperature conditions during summer, which reduced the energy depletion in post mortem Pectoralis major (PM) muscle. This resulted in a higher energy status compared to the T group, which would decrease the expression of phosphorylation of AMPK (p‐AMPK). Furthermore, decreased the expression of p‐AMPK then slowed down the rate of glycolysis in post mortem PM muscle during the early post mortem period, which in turn lessened the negative effects caused by transport on meat quality. In conclusion, water‐misting sprays with forced ventilation may be a better method to control the incidence of the pale, soft and exudative meat in broilers.  相似文献   

Flavonoid production in tomato mediates both direct and indirect plant defences against whiteflies in tritrophic interactions     

Fengbo Yang  Haowei Shen  Tianyu Huang  Qixi Yao  Jinyu Hu  Juan Tang  Rong Zhang  Hong Tong  Qingjun Wu  Youjun Zhang  Qi Su 《Pest management science》2023,79(11):4644-4654

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湿地松优良半同胞家系蛋白质及糖类对水分胁迫的生理响应   总被引：3，自引：0，他引：3  

童方平  方伟  马履一  宋庆安  龙应忠  吴际友  易霭琴  程勇 《中国农学通报》2006,22(12):459-459

为研究湿地松优良半同胞家系蛋白质及糖类对水分逆境的生理响应，采用盆栽试验和吸光度测定结合的方法，以湿地松普通种子为对照（CK），测定了七个湿地松半同胞家系在正常水分状态（土壤相对含水量为70%）、弱度水分胁迫（土壤相对含水量为55%~60%）、中度水分胁迫（土壤相对含水量为35%~40%）和强度水分胁迫（土壤相对含水量为20%~25%）条件下的可溶性蛋白质、还原性糖、可溶性糖的含量，研究结果表明：无论是不同水分梯度还是不同家系水平，蛋白质、还原性糖、可溶性糖含量的差异均达极显著性水平。随着水分胁迫程度的加剧，各家系蛋白质含量呈先升后降的趋势，在水分胁迫初期，各家系蛋白质含量增加，水分胁迫中、后期各家系蛋白含量呈直线下降；随着水分胁迫的加剧，各家系还原性糖、可溶性糖含量呈直线上升。家系1027、101、464在水分胁迫条件下具有较高的可溶性糖含量，其抗旱性较其它家系要强，是这三个家系速生、高产的生理原因之一。  相似文献   

The Application of Pre-splitting Blasting to Excavation on High Slope in Soft Rock Section     

KANG Hui ming  LI Xiao hong  LI Tong lin  JIN Xiao guang  LU Yi yu 《保鲜与加工》2001,(1):47-50

Based on analyzing about blasting mode of slope in the construction of road, the paper shows that pre splitting blasting is mostly suitable in the section of severely weathering soft rock with developed joints and fractures, introduced the laying out about the hole of pre splitting blasting that can apply in the high slope of the expressway in the section, and designed the parameter. The practice shows that it gained favourable effect by this method.  相似文献   

OPTIMIZATION OF BIPARTITE JOINS WITH GRAPH THGORY     

Zeag Yongning Tong Fu 《保鲜与加工》1989,(2):43-49

An optimization approach for multi-relational joins based on the matching concept in graph theory is introduced. The basic idea lies in constructing a join graph from an expression of N-relation query, and seeking for a maximun matching with minimun total weight. The algorithm for bipartition(X, Y) is proposed in this paper.  相似文献   

The Control Strategy for the Excitation System of Asynchronized Turbogenerators     

He Yaosan Lin Jingdong Tang Zhuoyao Tong Mingru 《保鲜与加工》1995,(5):7-12

In this paper, the excitation principle and operating characteristics ofasynchronized turbogenerators are analyzed,and adaptive tracing iterative control strategy based on state identification is proposed. In order to apply this control scheme to practice engineering, some primary elements are analyzed and presented for constituting dual-channel automatic excitation control system of asynchronized turbogenerators. Finally, the paper presents the principle structure charts about excitation control system of asynchroized turbogenerators.  相似文献   

Flow Boiling Characteristic of F12 in the Tubes with Inserted HelicaL Coils   总被引：1，自引：0，他引：1  

Tong Mingwei  Zhang Hongji 《保鲜与加工》1994,(5):36-41

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Developing a Recognition System of Gun-code     

YANG Bo  PENG Jian  YE Jun yong  LIU Jian sheng  WANG Tong qing 《保鲜与加工》2001,(5):139-141148

Intelligent recognition system of gun code is designed , which achieves online recognition of gun code. We applied video camera to get image, and some special technique in this deformed character recognition. As well, we applied dynamic template matching to get a better result.  相似文献   

Deoxidation Efficency Research of Jet Themral Dloxidation     

Tong Mingwei 《保鲜与加工》1995,(4):72-75

In this papet,a new deoxidationmethod-jet thermal deoxidation of industrialfeedwater was presented,a preliminary theoretical anlysis of mechamism of deoxidation methed wasmade. Using this experimental method,we studied the deoxidation methed and checked the effect ofthe temperatare pressure fogging state and jet direction on the deoxidation efficiency.  相似文献