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     

促芽肥与杂交中稻再生力关系及其作用机理

１９９１－１９９３年以２个杂交中稻品种为材料，研究了促芽肥与杂交中稻再生力关系及其作用机理。结果表明，促芽肥不能提高到２、倒３节位活芽率，可提高倒４、５位活芽率。促芽肥对再生力的效果与母茎 鞘干物质重有关，当母茎鞘干物质过大或过小时，促芽肥的作用极小。     

双环带种肥穴播器的设计

针对目前穴播机械的现状,设计了一种新型的双环带种肥穴播器,介绍了其基本结构和工作原理.从结构上分析了种肥穴播合理性,并推导出了穴播器的入土端方程.试验证明,机速在1.0m/s时,该穴播器投放种子与肥料可靠,穴粒数、穴距和播深合格率都能满足要求.鸭嘴强制后开式设计有效解决了堵土问题,播种精度较高,可广泛应用于花生、棉花、玉米与小麦等农作物的播种.