足趾保护包头的测试方法及技术要求

本文系统阐述了足趾保护包头的技术要求、检测方法、检测设备的主要技术参数。对足趾保护包头和足趾保护鞋中容易混淆的技术要求和测试方法进行说明。为生产企业产品质量改进和企业产品选用提供指导。     

无机沉淀对土壤有机质吸附疏水有机污染物的影响

土壤有机质对疏水性有机污染物的吸附解吸是影响其在土壤中迁移、转化和归趋的重要因素之一。老化是有机污染物和土壤等介质长时间相互作用的结果,它影响着污染物的生物有效性。已有的老化研究注重有机污染物被土壤等介质吸附隔离的机制,很少考虑土壤等吸附剂自身演化对有机污染物吸附的影响。本文通过无机沉淀处理方法来模拟自然环境过程吸附剂自身的演化对土壤有机质吸附能力的影响,从而证明吸附剂自身的变化也是影响老化效应的一个重要因素。结果表明,不同无机沉淀包裹和填充的碱提土样品比原始碱提土样品具有更小的吸附能力,同时无机沉淀处理后的样品的吸附性能随着无机沉淀离子浓度增加而降低。这可能是无机沉淀覆盖碱提土样品的内外表面积和填充碱提土样品的微孔所引起的,同时也可能是无机沉淀占据了吸附有机污染物的高能点位所致。     

High-resolution inventory of NO emissions from agricultural soils over the Ile-de-France region

Arable soils are a significant source of nitric oxide (NO), a precursor of tropospheric ozone, and thereby contribute to ozone pollution. However, their actual impact on ozone formation is strongly related to their spatial and temporal emission patterns, which warrant high-resolution estimates.Here, we combined an agro-ecosystem model and geo-referenced databases to map these sources over the 12 000 km² administrative region surrounding Paris, France, with a kilometric level resolution. The six most frequent arable crop species were simulated, with emission rates ranging from 1.4 kg N-NO ha⁻¹ yr⁻¹ to 11.1 kg N-NO ha⁻¹ yr⁻¹. The overall emission factor for fertilizer-derived NO emissions was 1.7%, while background emissions contributed half of the total NO efflux. Emissions were strongly seasonal, being highest in spring due to fertilizer inputs. They were mostly sensitive to soil type, crops' growing season and fertilizer N rates.     

The impact of career customization on work outcomes: Boundary conditions of manager support and employee age

The current paper investigated the longitudinal effects of mass career customization (MCC) on job attitudes and objective career outcomes of employees in a professional service firm in the Netherlands. On the basis of theory on individualization of career trajectories, it was expected that the possibility for employees to customize their careers would be positively related to their job attitudes and subsequent objective career success, as indicated by their levels of affective commitment, work engagement, and received salary and bonuses. However, these effects were expected to occur primarily under the combination of high manager support for implementation of career customization and, on the basis of lifespan theory, older workers, as customization fulfills their increased heterogeneous career preferences. A three‐wave longitudinal study largely showed support for the study hypotheses; the relation between MCC use and work engagement and subsequent career success was stronger for older workers who received support for MCC, whereas the relation between MCC use and commitment was negative for older workers who received low support. The study shows the benefits of career customization in organizations by showing the conditions under which these benefits will manifest. Copyright © 2015 John Wiley & Sons, Ltd.     

基于加速老化和自然贮存数据的氟硅橡胶制品贮存寿命预估

目的准确评价氟硅橡胶制品的贮存寿命。方法利用G402氟硅橡胶制品自然贮存数据对加速老化试验数据进行检验。结果确认加速老化试验方法可行,数据可信,并根据加速老化试验中的模拟试验确定了贮存失效临界值。结论推测出G402氟硅橡胶制品的贮存寿命可以达到15年。     

基于CiteSpace中国生态补偿研究的知识图谱分析

生态补偿已成为生态环境管理领域的热点问题。本文基于CiteSpace可视化文献分析工具,以CSSCI数据库中1998—2018年的期刊论文作为数据源,以"生态补偿"为关键词进行文献检索,通过共被引、关键词共现分析以及聚类分析等,探讨生态补偿研究领域的知识基础以及研究热点与前沿。结果表明:①生态补偿研究的发文数量经历了缓慢上升、快速增长、平稳增加三个阶段;②生态补偿研究作者集中度较高,发行期刊涵盖经济学、地理学、生态学、制度经济学等多个学科,反映出生态补偿是一个多学科交叉的研究主题,生态补偿研究的综合性不断增强;③依据关键词知识图谱,"国家重点生态功能区""生态环境""可持续发展"等成为最新研究热点;④新时期生态文明建设下,"草原生态补偿""支付意愿""转移支付""退耕还林"等成为生态补偿研究的最新前沿话题。     

Marine Eutrophication: A Proposed Data Analysis Procedure For Assessing Spatial Trends

A methodology for the discrimination of the different trophic levels at a spatial scale in the marine environment is proposedusing spatial analysis methods and non-parametric statistics. Phytoplankton cell number, being a representative parameter to express trophic trends in the marine ecosystem is selected forthe methodology development; Saronicos Gulf, Greece is used for the case study. The proposed stepwise methodology includes interpolation for assessing the spatial distribution of phytoplankton cell number, division of the Gulf into a number of quadrates, development of a scale characterising trophic levels and finally characterisation of the trophic state ofeach quadrate using non-parametric statistics. The advantages of this methodology and the potential applications in coastal management studies are also discussed.     

时序逻辑电路分析方法的改进

本文采用次态卡诺图法对时序逻辑电路的功能进行分析,力图改进传统异步时序电路的分析方法,在保证分析结果正确无误的前提下,简化了常规分析方法中繁琐的步骤,更具有实用性。以一个8421BCD码表示的十进制异步减法计数器为例,给出各触发器状态方程的表达式,并用状态表、状态图分析其逻辑功能。     

辽宁省地质灾害遥感调查电子地图的制作

通过辽宁省地质构造解译图和辽宁省地质灾害遥感解译图这两个电子地图的制作，说明了电子地图制作的工具选择、制作方法、关键技术以及地图应用等。体现了地理信息系统这一现代化科技手段在防灾、减灾和地质环境的整治与保护方面的价值。     

琥珀山庄污水处理厂污泥上浮的成因与控制

污水处理厂的污泥上浮会影响污水处理系统的操作、运行和出水水质.活性污泥上浮以后,如不及时处理会造成污泥大量流失、氧化沟内MLSS值降低、微生物量锐减,导致运行彻底失败.本文以合肥市琥珀山庄污水处理厂的工艺运行为实例,寻求活性污泥上浮的原因及其控制对策.通过多年的观察与实践,认为污泥上浮的主要原因有污泥老化与腐化、污泥反硝化、冲击负荷、曝气过度、污泥携油上浮等.实践表明,气温、气压和水温的变化也是污泥上浮的重要原因.常用的控制污泥上浮的方法有增加污泥回流量、及时排除剩余污泥、降低混合液浓度、缩短污泥龄、降低溶解氧、消除沉淀池的死角区、加大池底坡度以及改进池底刮泥设备等.