水城河污染状况监测

为了解六盘水水城河的污染情况,对该河水体的化学需氧量（COD）、干物质重（TSS）及pH进行监测。结果表明：在取样的10个样点当中,COD含量在（10～1000）mg／L范围内波动;pH维持在5．0～7．0之间,水质呈弱酸性;干物质含量为0．02～8．75g／L,且从河流上游到下游TSS总体呈上升趋势。显示了水城河水体有机废水浓度较高,污染较为严重,应采取积极措施加强治理。     

Investigating the effectiveness of three-dimensionally printed anatomical models compared with plastinated human specimens in learning cardiac and neck anatomy: A randomized crossover study

Three-dimensional printing (3DP) technology has been increasingly applied in health profession education. Yet, 3DP anatomical models compared with the plastinated specimens as learning scaffolds are unclear. A randomized-controlled crossover study was used to evaluate the objective outcomes of 3DP models compared with the plastinated specimens through an introductory lecture and team study for learning relatively simple (cardiac) and complex (neck) anatomies. Given the novel multimaterial and multicolored 3DP models are replicas of the plastinated specimens, it is hypothesized that 3DP models have the same educational benefits to plastinated specimens. This study was conducted in two phases in which participants were randomly assigned to 3DP (n = 31) and plastinated cardiac groups (n = 32) in the first phase, whereas same groups (3DP, n = 15; plastinated, n = 18) used switched materials in the second phase for learning neck anatomy. The pretest, educational activities and posttest were conducted for each phase. Miller's framework was used to assess the cognitive outcomes. There was a significant improvement in students' baseline knowledge by 29.7% and 31.3% for Phase 1; 31.7% and 31.3% for Phase 2 plastinated and 3DP models. Posttest scores for cardiac (plastinated, 3DP mean ± SD: 57.0 ± 13.3 and 60.8 ± 13.6, P = 0.27) and neck (70.3 ± 15.6 and 68.3 ± 9.9, P = 0.68) phases showed no significant difference. In addition, no difference observed when cognitive domains compared for both cases. These results reflect that introductory lecture plus either the plastinated or 3DP modes were effective for learning cardiac and neck anatomy.     

城市交通绿地土壤抗蚀性———以内江市城区为例简

选择内江市交通绿地（林地、灌丛、草地）为研究对象,通过对土壤干筛团聚含量、土壤机械组成、土壤水稳性指数（K值）、土壤抗蚀性指数S（％）等指标的测定和分析,研究了城市交通绿地土壤的抗蚀性能.结果表明,三种城市绿地土壤抗蚀性强弱不同,但都随时间的延长呈下降趋势,并且三种模式下土壤抗蚀指数都随浸水时间（t）呈三次函数曲线变化（R2＞0.9684）;其中相关分析得出水稳性指数与粘粒、物理性粘粒、＞0.25 mm粒径、2～5 mm粒径、5～7 mm粒径呈正相关关系,与粗粉粒、砂粒、0.25～0.5 mm粒径、0.5～1 mm粒径表现出负相关趋势,这说明土壤团聚体大粒径、机械组成粘粒和物理性粘粒含量越少,土壤水稳性指数越大,抗蚀性能越强.抗蚀性能强弱由大到小为：草地＞灌丛＞林地.     

煤矿井下掘进工作面干式过滤除尘实验教学系统建设

建立了干式过滤除尘实验模型,并设计了煤矿井下掘进工作面干式过滤除尘实验教学系统,系统主要包括除尘器本体、脉冲清灰、模拟现实巷道3个子系统.利用相似原理对巷道模拟子系统的长度、相对位置等参数进行了优化设计.通过调整粉尘源及抽压风筒相对位置、净化风量、相对湿度等外部参数,模拟掘进工作面现场情况.利用预设传感器对干式过滤除尘...     

二维码标签在植物病害教学标本制作及识别中的应用

随着移动网络的校园全覆盖,结合植物病害标本制作的特点,将二维码技术应用于植物病害标本标签制作中,挖掘二维码与标本制作的信息化结合点,阐述二维码技术应用于植物病害标本制作与识别中的可行性与创新性,简单、快捷地为学生提供更加详尽的植物病害信息.随着二维码技术的发展,它将不断为常规实验教学资源创新提供新的改进方法.     

插花节与赛装节--从旱作到稻作的农耕祭祀主题

中国云南省楚雄彝族自治州大姚县昙华乡的插花节与永仁县直苴村的赛装节都有着复杂的多层主题,而两个节日初始的内核是该地区农业生产方式由旱作向稻作转型,或旱作与稻作并存的农耕祭祀主题.围绕这一主题,文章从两个节日的祭祀内容、文化内涵、主题的流变、主题形成的文化心理因素、文化生态以及蕴涵在这一主题中的三个深层内涵等方面进行了深入阐释.文章认为插花节是昙华地区农耕旱作文化的载体,赛装节是直苴地区农耕稻作文化的载体.两个节日的主题无论如何演变,都离不开彝族人民对自然、土地、农业文明的崇拜和礼赞.     

一维摩擦振动停点的理论研究

详尽地讨论了具有初速的一维摩擦振动停点的若干问题。给出了最终停点位置、振动次数的条件及所需时间的一般表达式，并对振动变化规律作了相应分析。     

全媒体动物标本库的建设构想

介绍了山东农业大学动物科技学院动物标本库建设的情况,阐述了在全媒体时代,动物标本库在互联网和手机移动互联网建设的可行性、必要性和应用价值,描述了各种数据库的建设构想和实现的手段,为未来标本库的建设提供有益的参考.     

磁控式水位传感器的设计

自动供水系统是一个先对水位进行检测而后根据情况执行相应操作的系统。其信号输入端是一套能够对水位进行自动检测并将检测情况即时告知系统控制部分的装置,而由干簧管和磁性浮子组成的磁控式传感器便是具有此种功能的传感器。     

Introduction of the Concept of Logistics Providers of Dry Bulk Cargos and Operation Models of Shipping Companies

This article is an empirical study of the status quo of the logistics services of shipping companies dealing with dry bulk cargos. It expounds the necessity and feasibility of logistics services for dry bulk cargos, explaining basic models of logistics services in shipping dry bulk cargos. Finally, it investigates the selection of models.