一种适用于屋面绿化的种植层结构

针对屋面绿化的种植层容易流失的情况，介绍了一种适用于屋面绿化的种植层结构，通过增设围护结构，提供了一种有效阻止种植基质流失的方法，同时又不影响整体景观效果。     

Studies on pore blocking mechanism and technical feasibility of a hybrid PAC-MF process for reclamation of irrigation water from biotreated POME

An integrated low-cost adsorption (with powdered activated carbon, PAC) and cross-flow membrane filtration (with microfiltration membranes of 0.1 and 0.2 μm pore sizes) process was employed for the treatment of biotreated palm oil mill effluent (POME) to produce irrigation water that is fully benchmarked with water-quality standards. The permeate quality was within the recommended standard for irrigation water, as the concentrations of all critical constituents were well below their recommended values. Sustainability of the process integration was further confirmed with the domination of cake filtration over other blocking mechanisms with higher R² values at all trans-membrane pressures. Suitable extended usage of permeate was found for toilet/urinal flushing.     

雾化布液堆浸某铀矿石的柱浸试验

采用雾化布液新工艺,进行了某铀矿石的小型室内柱浸试验,并对雾化、喷淋、滴淋3种布液方式作了对比。结果表明,雾化布液的均匀性好,矿堆无板结现象,矿石浸出性能较好,浸出周期缩短,液固比小,适宜于某铀矿石的处理。     

堆浸雾化布液条件实验研究

布液是堆浸浸出工艺中一个重要环节之一。本文介绍了一种新的布液方法——雾化布液。用铀矿石模拟矿堆，通过堆浸雾化布液条件实验，得出使用该布液法能得到较高的浸出液铀平均浓度及较高的浸出率，能缩短浸出时间，提高经济效益，从而验证了雾化布液的优越性。为堆浸矿山采用雾化布液提供参考依据。     

Tubular dentin sealer penetration after different final irrigation protocols: A confocal laser scanning microscopy study

The aim of this study was to evaluate tubular dentin sealer penetration, comparing different final irrigation protocols using a conventional needle (CONV), EndoActivator system (EAS), EndoVac system (EVS), and ultrasound (PUI). Initially, fifty‐two first maxillary molars with a single canal in the palatal root, without abrupt curvatures, resorptive processes, or previous endodontic treatment were selected for this study. Then, the crowns were sectioned to obtain palatal roots 15 mm in length. The root canals were prepared with the ProTaper Universal System and irrigated with 5% NaOCl. Afterwards, the specimens were divided into four groups (n. 13), according to the final irrigation protocol: CONV, EAS, EVS, and PUI. After filling, slices at 3 mm and 5 mm from the apex were obtained for analysis by confocal laser scanning microscopy. Two‐way comparisons between the groups and the levels were performed with Games Howell's test (p < .05). Tubular dentin sealer penetration was higher at 5 mm compared with 3 mm from the apex (p < .05). The EAS group showed a higher percentage of tubular dentin sealer penetration, compared with the CONV group, at both levels. At 3 mm, there was no statistically significant difference among EAS, EVS, and PUI; however, these groups showed better performance, compared with the CONV group. At 5 mm, there was no statistically significant difference between the EAS and EVS groups, but both showed higher sealer penetration than the PUI group (p < .05). The EAS and EVS groups achieved better degrees of tubular dentin sealer penetration, compared with the other groups.     

农田灌溉用水量客观测算模型数据库研究

农业灌溉用水量约占全国总用水量的60％,客观测算农田灌溉用水量是落实最严格水资源制度的重要抓手,综合运用数据库管理手段实现农业用水复核工作的流程化和规范性成为迫切需求.深入剖析农田灌溉用水量客观测算的原理与方法,梳理测算业务的数据流程,基于合理的数据分类提出测算模型数据需求.分析各类数据特性及数据间的关联特性,明确数据...     

注重旱区湿地生态保护与修复的疏漫灌溉研究

针对干旱地区传统生态调度“只调不灌”造成的湿地生态补水效果欠佳、生境日益退化等实际问题,本文提出了疏漫灌溉的基本理念,明确了疏漫灌溉的定义、内涵及系统组成,搭建了疏漫灌溉系统,构建了疏漫灌溉技术体系。本文以哈巴河流域阿克齐湿地为研究区域,基于疏漫灌溉的系统组成优化了阿克齐湿地原有的工程体系;基于工程布局等要素划分了不同水平年下的三层级生态修复分区;采用Penman-Monteith公式计算了疏漫灌溉区不同地类的适宜生态需水量,采用改进的Tennant法确定了湿地的最低生态流量,最后制定了疏漫灌溉制度。研究结果表明：(1)湿地需水月份集中在4—10月份,其中6—8月份为主要生态需水期,平均生态基流为4.66 m³/s;(2)疏漫灌溉工程的布设和生态修复分区的确定改善了湿地供水条件,形成了生态分区与工程体系一一对应的靶向补水模式;(3)疏漫灌溉制度的制订可为生态工程的规划设计以及灌区引水的管理提供科学依据;(4)实施生态调度后,草地、自由水面以及沼泽面积均呈递增趋势,沙化面积减少了9.83%,湿地的水系连通性得到改善,斑块破碎化逐渐修复。研究成果可为提高旱区水资源利用效率、旱区生境的保护与修复提供技术支撑。     

沼液水肥一体化防堵塞灌溉系统在蜜桔园的推广应用研究

本文提出一种沼液水肥一体化防堵塞灌溉系统,并在新余市罗坊沼气站的蜜桔园进行推广应用。结果表明：在经过较长时间运行后流量未见明显损失,仍能保持原有效率,沼液过滤系统能够很好地将大中小固体颗粒除去,不易堵塞,保证处理后沼液满足作物正常生长使用。采用沼液水肥一体化防堵塞灌溉系统每亩平均减少肥料量50%,每亩产量平均增产2.8%,节本增收的经济效益平均每亩可达245.5元,经济效益显著,该沼液水肥一体化防堵塞灌溉系统适宜在南方果园推广应用。     

提高引黄保证率的微差爆破开槽方法研究

小浪底水库运用后,由于上游水沙条件的改变,黄河下游的河型处于剧烈变化之中,常导致引水口脱溜,引黄取水保证率常处于较低水平。采用微差爆破开槽的方法,可以保证河道主流和闸门之间的引水渠畅通,是提高游荡性河段的引水闸门引水保证率的一种有效方法。该方法首先用爆破形成可以冲开的最小引槽,然后引水冲刷,形成需要的闸前引水渠。试验表明,用最大一次起爆药量,可以控制爆破影响范围,爆破使土体液化的单向水平距离,约为爆破深度的10倍。用爆破方法可以快速形成成型的引槽。爆破不仅不会把成型槽周围泥沙压实,还会通过细沙的回填分选效应,使成型槽周围泥沙更易起动。     

凤台县农田灌溉水有效利用系数变化影响因素分析

为提高农田灌溉水有效利用系数,以凤台县实测调查资料为基础,结合当地生产实际,运用首尾测算分析法测算了凤台县2018—2021年农田灌溉水有效利用系数,从水资源条件、灌区总体规模、工程投入和管理措施四个方面对农田灌溉水有效利用系数的影响及变化规律进行了探讨分析。结果表明,持续推进灌区续建配套与节水改造项目、推广节水灌溉技术和加强灌区管理能有效提高凤台县灌溉水利用系数。研究成果对发展节水型灌区、节水型社会具有十分重要的意义,对制定县域节水灌溉规划具有一定参考价值。