岩溶地下洞河诱发路基空间失稳机理数值模拟

随着“西部大开发”等国家战略的实施以及这些地区城市建设的发展,许多公路、铁路等交通都需要源于或穿越这些岩溶洞穴地区,随即面临因岩溶洞穴的塌陷所导致的路基失稳与破坏问题。本文依托昌金高速某段的岩溶塌陷进行了数值模拟,并结合塌陷段模拟分析所得的岩土体参数对邻近未塌陷段的二个处治方案进行了处治工程效果的数值模拟分析,为方案比选提供依据,对岩溶洞穴地区道路建设具有一定的指导与借鉴意义。     

老挝塞公省达克金矿区水系沉积物地球化学特征及找矿预测

达克金矿区位于老挝长山—岘港成矿带南缘,区域地质工作程度较低,为明确研究区找矿方向,首次对该地区开展了1∶50000水系沉积物地球化学测量,共采集836件样品,分析测试19种元素,通过相关性分析和因子分析将元素异常分成4类组合：F1（Cu-Cr-V-Ti）、F2（W-Mo-Bi）、F3（Au）、F4（Sn）。圈定综合异常17个,其中DJ5、DJ12、DJ10、DJ14、DJ6异常套合好、强度高、规模大、找矿潜力大。综合区内矿床地质特征及水系沉积物地球化学特征,圈定了岩浆热液型钨锡铋钼矿、铜铬镍钒钛矿及浅成低温热液型金矿3处找矿靶区,指明了下一步找矿方向,也为老挝南部地区开展此类工作积累了宝贵经验。     

黄河悬河稳定性评价专家系统的研制

从区域稳定性研究入手，以地壳、堤坝与地基三系统控制论为理论基础，系统总结了悬河研究领域中的最新成果和结论。提出了工程治理与环境治理，环境治理与经济发展，地质工程治理与水利工程治理相结合的治理策略，并用先进的人工智能技术，研制出黄河悬河稳定性评价专家系统，为黄河下游悬河分析、评价与处理以及进一步研究提供有效手段     

A membrane filter method for the enumeration of aquatic ammonifiers

A standard procedure for the enumeration of heterotrophic bacteria, utilizing heterotrophic plate count medium (m-HPC), has been modified to allow bacterial ammonifier populations also to be counted. Nessler's reagent was included as an outside indicator to ascertain what portion of the population is capable of ammonification. Typically the ammonifier population varied among aquatic habitats, ranging from 0.08 to 37.0% of the heterotrophic population in river water samples, 0.2 to 10.6% for irrigation water samples, and 1.4 to 3.0% for pond and lake water samples.     

Water quality and diatom communities in two catalan rivers (N.E. Spain)

Benthic diatom assemblages have been used to evaluate the water quality of two rivers subjected to marked human influences. These rivers, the Llobregat and the Ter, are located in N.E. Spain, and supply water for industrial, agricultural and urban requirements of roughly three million people. The diatom communities in the headwaters are similar in both rivers (Achnanthes minutissima, Cymbella ventricosa, Gomphonema anguslatum). Species of Navicula, Nitzschia and Gomphonema develop in the middle reaches of both rivers when not disrupted by extraneous factors. In the river Ter significant pollution modifies this community and Nitzschia palea, Nitzschia gandersheimiensis and Gomphonema parvulum appear as the most tolerant species. In the Llobregat, the pollution from the salt mine operations also modifies the diatom assemblage and Nitzschia frustulum, Surirella ovata, Navicula atomus are the most abundant species. Reservoirs in the river Ter improve the quality of water and a community of Fragilaria sp. pl. becomes dominant downstream.     

深度处理污染河水的反渗透膜污染特性与防治

对以受污染河水为原水的反渗透系统膜污染问题进行了分析，初步认定反渗透膜污染是以生物粘泥、铁的氧化物及有机物为主的综合污染，而预处理的不完善、清洗方案选择不合理以及杀菌措施不够是导致膜污染的主要原因，最后提出了相应的解决办法。     

谈桃河治理

从宏观的角度概括了桃河的治理与阳泉市发展的关系。从微观的角度介绍了桃河河道淤积，泄洪能力差、河面及其地下污染严重的现状。分析了桃河的气候、水文地质条件和地理特征。阐述了治理桃河不宜设复式槽坝的原因。提出了治理桃河的基本原则和初步设想，以达治理好桃河，美化好阳泉的目的。     

沿江山地城市景观照明设计理念及方法探究

城市景观照明是提升城市形象，促进旅游经济发展的重要策略。沿江山地城市特有的地域特征及空间形态不仅为创建山水园林式的景观照明风格提供了良好的条件，同时，又对景观照明设计师提出了新的挑战。对此，本文根据沿江山地城市的特点，从地域性及人文性方面对景观照明设计理念进行了探讨，并结合光度学及色度学的基本原理对景观照明中的亮化分级和光色分层进行了应用和理论分析，并提出了创建立体化城市夜景的新概念。文中针对沿江山地城市景观照明设计中易出现的问题，提出了科学的解决方法，以防止因生搬硬套，盲目效仿等不良设计风气所造成的负面效应。该文以突出绿色照明思想为中心，强调了技术与艺术的结合，为创意独具特色的沿江山地城市景观照明风格提供了应用和理论依据。     

The behaviour of phosphate, nitrate, chloride and hardness in twelve welsh rivers

Selected water quality data from 12 rivers in the area administered by the Welsh Water Authority were analysed for the period 1974–1981. Mean nitrate-nitrogen concentrations varied from 0.4 to 3.7 mg l⁻¹ and were significantly related to the intensity of average catchment run-off; mean orthophosphate-phosphorus concentrations ranged from the limit of analytical detection to 0.730 mg l⁻²; chloride from 11 to 42 mg l⁻¹ and total hardness (as CaCO₃) from 13 to 173 mg l⁻¹. Seasonal patterns of change in concentration were established, generally for all determinands at most sites, but no long-term trends were detected. Relationships between concentration and flow were established for most determinands at many sites, increasing flow generally resulting in decreased concentration. However, positive relationships between nitrate concentration and flow were established at seven sites. Mass flows (kg ha⁻¹ yr⁻¹) were calculated at nine sites only: nitrate-N 4.8–24.6; orthophosphate-P 0.16–3.81; chloride 79–334; total hardness (as CaCO₃) 196–1629. Orthophosphate flows were related to sewered population density, estimates of per capita and land drainage contributions being 1.9 g day⁻¹ and 0.112 kg ha⁻¹ yr⁻¹ respectively.     

Occurrence and seasonal variations of Giardia in wastewater and river water from Al-Jinderiyah region in Latakia,Syria

ABSTRACT

This study investigates the occurrence and concentration of Giardia cysts in wastewater and river water samples in Al-Jinderiyah region, Latakia, Syria. A total of 120 samples were collected between October 2016 and October 2017 from influent and effluent of Al-Jinderiyah Waste Water Treatment Plant (WWTP) and from three contaminated river water sites. Samples were concentrated and subjected to microscopic examination. The results show that the concentrations of cysts ranged from 0 to 297 cysts/L in wastewater samples. The overall removal efficiency of cysts in the activated sludge WWTP was 84.35%. The concentrations of cysts ranged from 0 to 128.52 cysts/L in river water samples. The highest concentration in river water was recorded near the raw wastewater discharge point. Seasonal variations of Giardia cysts concentration were significant, and the highest concentrations were recorded in the rainy season. The results suggest that Giardia may pose a public health risk in the studied region.