基于模糊控制的水肥药一体化系统研究

为了提高目前水肥药一体化系统的自动化程度,设计了一种智能水肥药一体化系统;针对系统混肥精度不高的问题,设计了适用于营养液混合的模糊控制器,并利用Lab VIEW完成整个系统应用软件的开发。该系统不但能够实现独立灌溉、灌溉施肥一体化、灌溉施药一体化及水肥药一体化,而且还具备控制指令输入、系统工作监控和系统信息查询的功能。     

制种玉米密度对土壤水分及产量构成的影响研究

通过田间试验,就制种玉米密度对土壤水分、农艺性状、产量构成及产量的影响进行了研究分析。结果表明:1在拔节期以前,低密组的土壤含水量比高密组的高;在拔节期到灌浆期,高密组的比低密组的高。在整个生育期,拔节期前土壤含水量比较高,而后逐渐降低,吐丝期达到最低,然后又逐步上升。2在一定密度范围内,制种玉米株高、亩产量随着密度的增大而增加单株产量产量相反;叶长、穗粗、穗粒数先随着密度的增大而减小,后随着密度的增大而增大;叶宽、穗长、百粒重、出籽率先随着密度的增大而增加,后随着密度的增大而减小;叶面积、茎粗、穗位先随着密度的增大而减小,后随着密度的增大而增加,然后又随着密度的增大而减小,秃顶变化规律相反。     

动物诊疗机构人用药品使用现象分析及建议

随着社会经济水平日益提升,越来越多的人饲养宠物作为伴侣,与此同时宠物诊疗机构如春笋般蓬勃发展。然而其在发展中存在诸多问题,尤以使用人用药品问题最为突出。论文从药品使用现状、原因、管理等方面,对动物诊疗机构人用药品使用现象进行分析并提出一些建议,旨在进一步规范动物诊疗机构临床用药,使其良性发展。     

Some Ideas on Reconstruction of Villages inside the City

In this paper, the historical reasons of formation of the village inside the city are analyzed. It is indicated that such situation for the villages inside the city are the result of joint action of both the villagers and the government. The foundation of villages inside the city laid on the simple compensation for farmers in confiscating the rural land and lack of intelligence aids. In this paper, the ideas and measures for their reconstruction are put forward based on consideration of the reasons of their formation and difficulties in the reconstruction.     

PROBABILISTIC EVALUATION FOR STEEL FRAME COLUMNS OF TALL BUILDINGS

Based on properties of parameters and test data of dom-estic steel,this paper analyses the reliability and partial coefficient forresistance of steel frame columns of tall builings.The result may serveas a scientific basis.It is not only for domestic steel instead of importedsteel in building tall steel structures,but also for compiling concerendstandards.     

The Software System for Computation and Drawing of Ship Properties

The softwa re system suggested in this paper is applied to replace the traditionalhanded-computation forms. It uses the cubic sample interpolation and numerical integral,and is writ-ten with FORTRAN according to the accurate formula. With this software system,the nine sorts ofcomputation results of ship properties can be obtained. The system is con nected through SCR filewith AutoCAD,and ean draw automatically eleven sorts of pictures according to the computation re-sults.     

The Monitoring Measurements and Country Rock Control of NATM in Tunnel of Express Road during Construction

In this paper the author' s study on the monitoring measurement technique of NATM,the regularity and conditions of the country rock deformation are analysed based on the site measurement data in the west section of Zhongliangshan tunnel. The regression analysis of measure data for different measure lines of vavious country rock is done by the use of self-compiled CRAP program. The stability criterion for various rockmass and optimum time for primary and permanent support are provided. The conclusion available could conduct the theoretical research of NATM deeply as well as tunnel design and construction.     

A SDUDY ON THE LOCKING PERFORMANCE OF THE SYSTEM FOR HEIGHT OF MG150-WD COAL SEAM SHEARER

In this paper, based on the automatic-control theory, the time and frequency response of the hydraulic control system for height of MG150-WD coal shearer are analysed, and the steady and dynamic locking performance tests are made. The results show that the locking performance is satisfactory.     

玉米自交系及杂交种抗青枯病鉴定

1986-1989年采用自然鉴定和人工土壤接种鉴定的方法，对602份玉米材料的青枯病抗性进行了鉴定。人工接种鉴定397份，其中204份材料表现抗病。在正常年份，人工接种鉴定效果明显好于自然鉴定，但在重病区或青枯病流行年份，在尚未具备人工接种条件时，利用自然发病作为选育抗病材料仍有一定效果。玉米苗期接种青枯病重于成株期     

土壤水分对稻米外观品质的影响

水稻的分蘖期、长穗期、抽穗后1～10d、11～20d、21～30d及1～30d,用负压式土壤湿度计监测,分别进行土壤水势为-30～-35kPa、-60～-65kPa的控水处理,收获后对优势粒、中位粒、劣势粒进行粒形和垩白测定,发现在不同土壤水分下S品种长穗期和抽穗后1～10d控水显著抑制了籽粒伸长,也不同程度的抑制了籽粒增宽和长厚,以S4处理受抑制的程度最为严重;Y品种主要是长穗期控水显著抑制了粒长、粒宽和粒厚;两品种的多数处理不同程度的提高了粒厚,这在优势粒中更明显;土壤水分对粒长/宽的影响很小。S品种各处理垩白率、垩白度多低于CK,Y品种各处理垩白率、垩白度多高于CK。对两个品种来说长穗期是影响外观品质的主要水分敏感期,节水栽培应从品种选择入手。