平地漫灌灌溉水净化与循环利用研究

为提高设施农业的水分利用率，设计了平地漫灌灌溉水净化与循环利用系统；阐述了系统的组成、节水灌溉原理与工作过程。理论分析可知，系统具有较高的输水利用率、灌水利用率和降水利用率，是农业节水灌溉的有效新途径。     

Spatial patterns of the Citrus leprosis virus and its associated mite vector in systems without intervention

Leprosis is caused by the Citrus leprosis virus cytoplasmic type and is vectored by the mite Brevipalpus yothersi. Miticide applications, which cost $54 million annually, are based on inspection for the presence of mites. The aim of the present study was to characterize the spatial patterns of B. yothersi-infested trees and trees with leprosis symptoms for further improvement in sampling and disease control. The presence of mites and the occurrence of leprosis were assessed over two years in 1160 Valencia trees and 720 Natal trees in a commercial sweet orange grove in Sao Paulo State, Brazil. To assess the natural growth and dispersal of mites and leprosis, mite populations were not controlled during the experimental period. Maps of mite-infested trees and trees with leprosis symptoms were analysed at three different levels of spatial hierarchy using complementary methods, i.e. among adjacent trees within and across rows, within quadrats, and the strength and orientation of aggregation among quadrats. The study showed that the spatial patterns of virus-infected and mite-infested trees were different, with a strong aggregation pattern of trees with leprosis symptoms that increased over time. Conversely, the spatial pattern of B. yothersi showed randomness or weak aggregation at all three spatial hierarchical levels. Disease incidence increased steadily in plots of both cultivars, unlike in mite-infested trees where incidence fluctuated over time. These results have important implications for the development of better management strategies for leprosis. Sampling methods and action thresholds for mite control should consider primary disease inoculum in addition to the incidence of mites.     

糖水乳蟠桃罐头加工技术研究

乳蟠桃含有丰富的营养价值,作为我国药食兼用的食品之一,具有很好的保健功能,受到人们的青睐。本实验以新疆乳蟠桃为材料,通过对蟠桃罐头的单因素、正交实验分析得到蟠桃罐头生产加工的最佳配方：糖26%（m/v）、柠檬酸0.20%（m/v）、抗坏血酸0.15%（m/v）。     

浅谈屋面形式与防水卷材的应用及施工

为了保证屋面工程的功能和质量，屋面防水技术的提高与应用尤为重要，本文叙述了屋面形式和防水技术的应用，提醒工程施工人员在屋面防水施工中应注意的事项。     

连续平压热压机的进展

论述了发展连续平压热压机的背景、必要性以及国外同类技术的详细情况,同时介绍了我国目前研究连续平压热压机的现状和迫切性。     

鲆鲽鱼营养生理研究进展

本文综述了鲆鲽鱼类营养生理的研究进展,涉及鲆鲽鱼对蛋白质、氨基酸、脂肪、必需脂肪酸、碳水化合物、维生素和微量元素的需要量及各种营养元素的生理功能,评价饲料中各营养素缺乏和过量对鲆鲽鱼生长的影响,以及各营养素之间的相互关系。     

小型饲料搅拌机和平模颗粒机组合使用制备颗粒饲料的工艺研究

[目的] 研究JB-300型精饲料搅拌机和300型平模颗粒机组合使用制备牛羊精补料颗粒饲料的最佳工艺参数。[方法] 测定不同搅拌时间、装载系数对饲料混合均匀度的影响;确定搅拌混合工艺参数的基础上,测定不同玉米粉碎粒度、水分含量对颗粒饲料成型率的影响。以模孔直径、玉米粉碎粒度和水分含量为测定因素,以成型率和硬度的综合加权评分值为指标,确定制备颗粒饲料的最优组合参数。[结果] 搅拌时间为10 min、20 min的变异系数均显著（P<0.05）低于搅拌5 min和15 min。装载系数为80%时,变异系数显著（P<0.05）低于装载系数为70%和60%。玉米粉碎粒度为2 mm和4 mm时,颗粒饲料成型率显著（P<0.05）高于玉米粉碎粒度为6 mm和8 mm。水分含量为10%和13%时,颗粒饲料成型率显著（P<0.05）高于水分含量为16%和19%。影响正交试验综合加权平均分值的模孔直径、玉米粉碎粒度、水分含量的极差分别为18.76、1.64和3.47。[结论] JB—300型精饲料搅拌机混合饲料最佳参数：装载系数为80%、搅拌时间为10 min;300型平模颗粒机制作精补料颗粒饲料最佳参数：模孔直径为4 mm（压缩比为6）、玉米粉碎粒度为4 mm、水分含量为13%。     

Tidal effects on net ecosystem exchange of carbon in an estuarine wetland

One year of continuous data from two eddy-flux towers established along an elevation gradient in coastal Shanghai was analyzed to evaluate the tidal effect on carbon flux (F_c) over an estuarine wetland. The measured wavelet spectra and cospectra of F_c and other environmental factors demonstrated that the dynamics of F_c at both sites exhibited a tidal-driven pattern with obvious characteristics at scales between 10 and 20 days (256–512-h). Environmental factors exerted major controls on the carbon balance at finer temporal scales. F_c was more sensitive to tides at the low-elevation site than at the high-elevation site. Overall, the mean nighttime F_c during spring tides was lower than that during neap tides, indicating suppressed ecosystem respiration under inundation. Larger differences were observed at the low-elevation site due to longer inundation durations. In contrast, daytime F_c was more variable since plants reacted differently in different growth periods and under different tidal elevations. The amplitudes of diurnal F_c during tidal periods were larger than those reported for other wetland types, implying a great potential for future carbon sequestration. Whilst tides would also transport organic matter to nearby estuaries and hence may incur carbon emission in the receiving ecosystems. Thus, further study on lateral carbon transport is required to investigate the tidal effect on the carbon sink/source role of the wetland.     

浮动平底推杆等宽凸轮机构第Ⅱ类机构综合问题

以浮动平底推杆等宽凸轮机构为研究对象,通过引入往程、返程、向径标定线和等宽映射区间套等概念,阐述了往程/返程运动角、远近休止角的内在规律性关系,运动学尺寸、行程幅值和初位参数间的内在特征关系,输出摇杆返程角位移规律的求解,主副平底容许选择区段和凸轮基圆半径取值域确定,凸轮基圆半径、压力角和宽度的变化规律等,揭示了等宽凸轮机构的设计蕴含着诸多的异质性内涵。还对等宽凸轮机构、共轭凸轮机构进行了比较,得到了两种形锁合机构相同点、差异点。最后给出等宽凸轮机构的一个综合算例。