高职院校学风管理的现状与对策

文章根据高职院校的学风管理现状,提出了一些针对性的改善意见,包括突出学生思想品德教育、完善学风管理体系、协调各部门的工作等。     

New work study methods help to decide processing technique in logging

The great variation in technical properties between and within trees indicate that the efficiency of logging would be enhanced if the processing technique is adapted to the varying quality of different trees and stem sections. To evaluate the suggested differentiation in processing technique, time studies must be performed that define exact time consumption for short stem sections. This paper exemplifies how videogrammetry and computer aided recording and processing of data can be used for detailed time studies. Recordings made in the field were later run for actual time studies indoors, using a digital watch recorded on the tape. The trees cut for the study were measured in detail, as well as the resulting logs. By registering detailed tree data, an important source of variation could be controlled and sample size kept reasonably low. The method proved to function well, especially for determining very short work elements.     

植物病毒及脱毒研究之进展

植物病毒是一个极小的微粒.近几十年来,有关植物病毒的研究已取得很大的进展,对某些作物病毒的症状、寄生范围、传播途径、病理现象、鉴定方法及无毒苗培育途径等均已进行了深入的研究.     

内蒙古锡林郭勒盟农牧区移动式 风光互补发电系统应用

鉴于独立运行的风力发电系统或太阳能发电系统都有其自身的局限性,该文选择了结合风力发电和太阳能发电优点的风光互补发电系统作为研究对象,通过对内蒙古锡林郭勒盟农牧区的风能和太阳能资源进行分析,力求实现系统优化及其推广应用。     

Fruit Yield,Plant Growth and Nutrient Status in Mango

Abstract

Fruit yield and nutrient concentration of mango (Mangifera indica L.) cultivar ‘Osteen’ were studied in relation to rootstocks Gomera-1 and Gomera-3 for three years. The results indicated that the Gomera-3 root system had higher nutrient uptake and transport towards the scion. Data from grafted and ungrafted Gomera-1 and Gomera-3 trees proved similar with respect to N, P, and K utilization profile, with post-harvest accumulation and a decline during flowering, P and K concentrations significantly decreasing during fruit growth. These trends were largely the opposite for Ca and Mg. The Fe, Zn, Mn, and Cu concentrations rose during dormancy and fell at flowering. Fruit yield was higher with Gomera-1, while Gomera-3 gave fruit with greater weight and width. Tree height, trunk cross-sectional area, canopy diameter and volume were greater in grafted and ungrafted Gomera-3, this rootstock being the most vigorous. The yield efficiency was significantly greater on Gomera-1. Thus, cv. ‘Osteen’ grafted to Gomera-1 offered better yield and required a lower amount of nutrients.     

Accumulation and Mobility of Salts in Soil as Influenced by Primary Biomethanated Spentwash

A soil column laboratory experiment was carried out at the central campus, Mahatma Phule Agricultural University, Rahuri, India during 2008–2009 to study the accumulation and mobility of salts in Typic Haplusterts as influenced by primary biomethanated spentwash (PBSW). The PBSW was applied in three different levels (0.5, 1.0, and 2.5 cm) and then tap water with low salinity and low sodium hazard (C₁S₁ class) was used to carry out leaching in four different levels of water at the pore volume of soil (WPVS) (0.5, 1.0, 1.5, and 2.0). The electrical conductivity (EC) in the soil increased significantly with increasing levels of PBSW and decreased with increasing levels of WPVS in surface (0–15 cm deep) and subsurface (15–30 cm deep) soil layers. The exchangeable calcium (Ca²⁺), magnesium (Mg²⁺), and potassium (K⁺) increased, whereas exchangeable sodium (Na⁺) decreased with increasing levels of PBSW and WPVS in surface and subsurface layers of soil. The organic carbon content increased with increasing levels of PBSW and decreased with increasing levels of WPVS in both the soil layers. The cation exchange capacity (CEC) increased with increasing levels of PBSW and WPVS in both the soil layers. The exchangeable sodium percentage (ESP) decreased with increasing levels of PBSW and WPVS over the initial values of soil in both the layers. The pH of saturated paste (pHs) was reduced and electrical conductivity of extract (ECe) was increased with increasing levels of PBSW and WPVS in both the layers. The Na⁺ content of saturation paste extract increased significantly with increasing levels of PBSW and WPVS in both the soil layers.     

添加烟酸铬对生长肥育猪的生长性能、代谢及组织学的影响

将选用的 12 0头杜长大杂交生长肥育猪随机分成 4组 ,3组为实验组 ,1组为对照组 .在实验组的日粮中添加 2 0 0、50 0、10 0 0 μg· kg-1烟酸铬 (以 Cr元素计 )进行为期 2个月的试验 .结果表明 :( 1)试验组日增重比对照组分别提高 11.7%、11.1%和 12 .5% ;料重比分别提高 5.5%、5.6%和 4 .2 % .( 2 )添加 Cr对血清中 K+、Na+、Cl-、总蛋白、白蛋白、脂蛋白及血红蛋白无影响 ( P>0 .0 5) ;血清中 Ca2 +、PO3-4 、尿素氮、尿酸、甘油三酯、胆固醇和血糖含量显著下降 ( P<0 .0 5) ;血清碱性磷酸酶、天门冬氨酸转氨酶、丙氨酸转氨酶含量明显升高 ( P<0 .0 5) ;磷酸肌酸激酶含量显著升高 ( P<0 .0 5) ;而乳酸脱氢酶无明显改变 ( P>0 .0 5) .( 3) Cr含量均未超过国家限量标准 .( 4 )未发现器官的组织结构和细胞形态有何改变 .由此可见 ,在生长肥育猪中添加一定量烟酸铬制剂对猪有积极正面效应     

甘肃仁用杏发展前景分析研究

根据甘肃自然、社会经济的特点对发展仁用杏的前景从技术、经济及市场的角度进行了分析研究，并对我省发展仁用杏提出了具体建议。     

液-液水力旋流器的试验研究

描述了影响液－液旋流分离器性能的流体物性参数，含油污水模拟液的制备，试验装置流程以及级效率的测定方法。介绍了旋流器的结构参数和试验方法，重点研究了在操作 参数下不变的条件下，旋流器溢流孔径和入口尺寸、小锥段角度和尾管段尺寸对旋流器性能的影响，并进行了一系列试验研究，以便改善旋流器分离性能，降低能耗，为旋流器结构尺寸的优化设计提供依据。     

对福州市旅游景区的认知研究

运用NMDS方法研究了福州市居民对福州市旅游景区的认知。通过空间定位图分析发现,在居民的认知中福州市10家旅游景区被聚合为3个组群：自然风光类旅游景区组群、人文风貌和自然风貌旅游景区组群、海岛风光旅游景区和博物馆旅游景区组群;在当地居民对旅游景区的感知情况方面,有4家旅游景区的感知率小于60%;在到访情况方面,旅游景区到访率只有3家大于70%,有2家介于35%和55%之间,有5家小于30%。通过特征属性和旅游景区之间的配适分析与水平距离分析发现,居民对前2个组群的评价较高,对后1个组群的评价较低。据此提出了福州市旅游发展的建议。