中层拖网的水层控制   总被引：2，自引：0，他引：2  

王尔光 《大连水产学院学报》1991,6(2):21-29

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一种简易的花房温湿度无线自动监控系统     

杨守建  李宏 《黑龙江农业科学》2011,(8):121-124

花房内的温湿度变化直接影响到花卉的健壮生长,以C8051F330为核心设计一款简易的花房温湿度无线自动监控系统,可对花房内的温湿度进行实时自动监控,当花房内温湿度指标超过设定值时,系统发出声光报警。该系统温度测量范围为-55~125℃,精度为±4℃;相对湿度测量范围为10%~90%,精度为±5%。经测试,系统运行稳定,...  相似文献   

突发性环境污染事故应急监测的速度保障     

张先宝  曹锋  廖志凌 《农机化研究》2004,(3):144-145

针对突发性环境事故如何保证应急监测速度的问题，从应急监测前准备工作及应急监测运行期两方面进行说明，为保障应急监测速度提供了切实可行的方法和步骤。  相似文献   

Video Monitor and Control System of Tunnel Based on DSP/BIOS     

YNAG Shang-gang  HUANG Xi-yue  LI Bao-lin  ZHANG Wei 《保鲜与加工》2006,(7):81-84

A video Monitor &Control system of tunnel based on DSP/BIOS is proposed,which is different from traditional video Monitor & Control system.It uses DSP to process image,and uses enhanced video input processor to qcquire image.This system satisfies all requirements of video supervision,and is a low cost system.It has a good application foreground.The system has been confirmed as a good veracity and practicability system through testing in the Zhongliang Mountain tunnel of Chongqing.  相似文献   

Incentive Mechanism for Team Cooperation Based on Implicit Side Contract     

WEI Guang-xing  PU Yong-jian  QIN Yan-hong 《保鲜与加工》2006,(12):136-140

Aiming at the free-riding problem in team incentive, this paper designs a dynamic incentive mechanism based on implicit side contract with dynamic game theory by introducing the reasonable assumption that there is horizontal monitor in team production. The theoretic analysis indicates that the dynamic incentive mechanism, in which a strict group incentive compatibility contract is taken at the first stage and an individual incentive compatibility contract is taken at the second stage, can implement team cooperation uniquely in the general condition of risk aversion and stochastic production by only two stage repeated game.  相似文献   

机器视觉技术在精细农业中的研究进展   总被引：2，自引：0，他引：2  

冀荣华  祁力钧  傅泽田 《农机化研究》2007,(11):1-5

精细农业以节约投入、增加产出、提高投入物利用率、减少环境污染为目的.快速、准确地采集各种农田信息,有效地监测农业对象是实施精细农业的重要基础.机器视觉技术由于其非破坏性、精度高、成本效率高、信息量大、灵活等特点,在精细农业中得到了广泛的应用.为此,通过对大量参考文献进行分析,发现机器视觉在精细农业中的主要研究方向集中在农业机械自动导航、作物生长信息检测、变量控制等方面.同时,对机器视觉技术在上述领域中的研究情况进行分析和总结,并讨论了未来机器视觉技术在精细农业中应用存在的问题以及发展前景.  相似文献   

白云山水库调度管理系统   总被引：1，自引：0，他引：1  

李国亚  齐鄂荣  余慧  李国宏  张洪刚  叶家生 《中国农村水利水电》2003,(5):43-45

针对江西省吉安市白云山水库自建的局域网的特点，研制开发了水库调度管理系统软件。简要介绍在Power Builder平台上开发的水库调度管理系统软件中有关电力部分的主要功能和系统软件开发要点，重点介绍实现实时监控、报表制作等功能的关键技术，并介绍了四的技术关键。  相似文献   

露地栽培番茄斑萎病毒病发生流行规律调查及TSWV重要寄主植物监测     

李婷婷  尹跃艳  兰梅  袁琼芬  李凡  丁铭 《植物保护学报》2020,47(2):339-346

为明确云南省昆明市露地栽培条件下番茄斑萎病毒病的发生流行特征,于2014—2015年采用病害系统调查法结合病毒ELISA及RT-PCR检测方法研究露地栽培条件下由番茄斑萎病毒(tomato spotted wilt virus,TSWV)引起的病毒病发生规律及其重要寄主种类,并研究利用防虫网隔离蓟马对番茄斑萎病毒病的防控效果。结果表明:番茄斑萎病毒病在露地番茄主要种植期3—10月普遍发生,番茄苗期和移栽初期是该病毒病防控的关键期,带毒种苗调运是该病毒病的主要传播途径;田间多种茄科和菊科植物是TSWV的重要中间寄主。在田间,菊科寄主植物油麦菜、莴苣、鬼针草、牛膝菊上TSWV的检出率均较高,在42.53%～81.63%之间;茄科寄主植物中辣椒上TSWV的检出率最高,为41.99%,其次为马铃薯,TSWV检出率为27.78%,在番茄上TSWV的检出率为19.02%,因此生产中应对这些TSWV重要中间寄主给予更多关注和防控。应用防虫网能有效隔离蓟马,使番茄斑萎病毒病发病率和病情指数较对照分别降低了6.44个百分点和5.31,可有效降低番茄苗期及定植期斑萎病毒病的发生。  相似文献   

福建街面水库水质现状及浮游生物调查     

崔利峰 《河北渔业》2010,(5):38-40,44

选择福建省尤溪街面水库两个样点分别于2008年8月-2009年6月对水体石油类、氨氮、总氮、总磷、高锰酸盐指数、大肠菌群进行监测,并在2008年8月对水库浮游生物进行调查。结果显示,目前街面水库水质良好,浮游生物以硅藻为主。  相似文献   

Nocturnal feeding reduces sea bass (Dicentrarchus labrax, L.) pellet-catching ability     

V. C. Rubio  F. J. Snchez-Vzquez  J. A. Madrid 《Aquaculture (Amsterdam, Netherlands)》2003,220(1-4):697-705

European sea bass exhibits a feeding rhythm with seasonal phase inversions: nocturnal feeding is predominant in winter, and diurnal feeding during the rest of the year. This explains the increased growth of sea bass fed at night during the winter months, but to fully assess such feeding practices, it is important to monitor food-catching efficiency in the dark. To evaluate the influence of nocturnal feeding on pellet-capture efficiency under laboratory conditions, we developed an infrared pellet detector linked to on-line recording with a microcomputer. Feed waste was recorded for eight groups of four sea bass (54.6±15.8 g body weight) fed either diurnal or nocturnal meals with long (>60 s) or short (<20 s) feed availability times. With short feed availability times, food-catching efficiency in complete darkness (0 lx) was reduced to 78.6%, compared to 93.5% in diurnally fed fish. This was confirmed in a second experiment, performed during winter, involving 4000 sea bass in four sea cages (1000 per cage) provided with self-feeders and pellets detectors. Feed waste amounted to less than 13% of the food distributed, but nocturnal demands (29% of total feed demands) were accompanied by higher levels of uneaten pellets (68% of the total feed waste) than diurnal demand. This suggests that if the aim is to reduce feed waste, nocturnal feeding should be restricted in sea cages.  相似文献