吡草醚原药对大鼠一般生长情况的影响及其慢性肾毒性研究

研究吡草醚原药对大鼠一般生长情况的影响,寻找慢性毒性靶器官以及确定最大无作用剂量(NOAEL)。将初重为40~50 g的SPF级SD大鼠随机分成对照、低、中和高剂量组,160只/组,雌雄各半。各组动物分别给予含有不同浓度吡草醚原药的饲料(0,80,400,2 000 mg·kg-1的饲料),染毒期间不限制摄食饮水,期限为104周。结果显示雌、雄鼠中、高剂量组1~104周的体重、增重、食物利用率与对照组比较,于不同阶段均有不同程度降低,差异有显著性(P0.05或P0.01或P0.001);中、高剂量受试物可导致大鼠血液中尿素氮(BUN)水平升高及胆碱酯酶(Ch E)水平下降,肾脏器系数升高,与对照组比较差异有显著性(P0.05或P0.01或P0.001);病理学检查显示中、高剂量组可引起肾小管上皮细胞变性、肾脏间质炎、慢性进行性肾病等。实验结果表明在本试验条件下,中、高剂量的吡草醚原药可明显影响大鼠的体重增长及食物利用率,对SD大鼠的慢性毒性靶器官是肾脏。     

装备典型舰载平台振动环境严酷度分析

目的为了正确识别舰载环境。方法采用INV3062T2数据采集系统,在典型舰载平台上实测了装备在舱室内的振动环境。结果数据表明,舱室内各方向上的振动加速度是一个正态随机变量,得到了各方向加速度峰值和振动加速度谱密度。结论分析表明,舱室内典型振动环境属于I型,是一类长期存在但量值较小的振动环境。     

Microalgae binary culture for higher biomass production,nutrients recycling,and efficient harvesting: a review

Environmental Chemistry Letters - Microalgae are photosynthetic cell factories of global interest for fuels, food, feed, bioproducts, carbon sequestration, waste mitigation, and environmental...     

“Green” economic development in China: quantile regression evidence from the Yangtze River Economic Belt

As China’s economy began transitioning from one focused on high-speed growth to one focusing on high-quality development, sustainable green development has become the main goal pursued by the government. This study empirically measures the marginal impact of per capita GDP, technological innovation level, industrial structure, openness, fiscal decentralization, and urbanization level on per capita wastewater discharge in 11 provinces (cities) along the Yangtze River Economic Belt (YREB) from 2008 to 2018 using a quantile model. The key findings were as follows: (1) factors such as the per capita GDP, industrial structure, foreign direct investment, and urbanization in the YREB significantly increased water resource pollution; (2) the quantile model regression results showed that the relationship between economic growth and ecological pollution followed the so-called environmental Kuznets inverted U-curve. Wastewater discharge per capita was low in areas with low per capita GDP, meaning that the ecological environment in these areas was more fragile and that the environmental pollution costs due to economic growth were therefore relatively much higher in these areas; (3) fiscal decentralization significantly reduced water resource pollution in relatively developed areas although the effects in the relatively developing areas were not significant; and (4) the effects of technological innovation on reducing water resource pollution in the YREB were positive but not very significant. The results also confirmed that traditional patterns of economic growth increased water pollution in the YREB. For this reason, the government needs to urgently improve policies—for example, upgrading economic structures, preventing over-urbanization, speeding up technological innovation, introducing environmentally friendly foreign investment, and providing more rewards to best practitioners of environmental governance—that is conducive to the achievement of green ecological development.

     

Uptake,translocation, and degradation of spirotetramat in tomato (Lycopersicon esculentum Miller): Impact of the mixed-application with pymetrozine

Environmental Science and Pollution Research - In this study, we investigated the impact of the mixed-application with pymetrozine on the behavior (i.e., uptake, translocation, and degradation) of...     

The influences of industrial gross domestic product,urbanization rate,environmental investment,and coal consumption on industrial air pollutant emission in China

With the rapid economic development and urbanization, there would be severe air pollution. The path analysis method was employed to investigate the specific effects of Industrial Gross Domestic Product (IGDP), Urbanization Rate (UR), Environmental Investment (EI), and Coal Consumption (CC) on Industrial SO₂ Emissions (ISE) and Industrial Dust Emissions (IDE). The results shown that (1) IGDP is the main reason for the increase in ISE and IDE, with the direct positive influence more than 20% and a total contribution of more than 35%, and the combined effects of UR can reduce air pollutants emission considerably, especially in ISE. (2) The effects of EI and CC on ISE could be ignored, given that their contributions comprised <?10%. Meanwhile, the contribution of EI to IDE was only 8.92%. For one reason, EI is underfunded which the percentage of Gross Domestic Product was <?2%.     

布筋形式对加筋土挡墙变形性能影响研究

筋材布置是加筋土挡墙设计中的一个重要问题,通过具有不同布筋形式的加筋土挡墙砂箱模型实验,研究布筋形式对加筋土挡墙变形性能的影响。结果表明:在筋材面积相等的条件下,网格式布筋面板变形更加均匀,而条带式布筋面板易在中下部发生过大的局部变形;对于条带式布筋,减短单筋长度、加密布筋,或筋材上长下短铺设,能提高墙体稳定性;对于网格式布筋,筋材间结点越强,墙体抵抗变形能力越好;在筋带末端增加一个竖向副筋能有效控制面板变形。该研究成果可为实际工程中布筋形式的经济合理化设计提供参考。     

ClO2和Cl2混合消毒剂对氯仿形成的影响

研究了ClO₂和Cl₂混合水溶液对黄腐酸、间苯二酚、间苯三酚和3,5-甲苯二酚等9种THMs前驱物在ClO₂/Cl₂各种配比、前驱物含量、反应pH、反应时间和温度等不同条件下对氯仿形成的影响.结果表明,随着ClO₂占混合消毒剂中质量分数的增加,形成氯仿量减少,在混合消毒剂中ClO₂的质量分数为25%、50%和75%时,CHCl₃生成量分别减少55%～65%,70%～86%和80%～93%;直到ClO₂占90%时,CHCl₃降低率才达到95%～99%.欲较彻底地控制氯仿的生成,ClO₂的质量分数必须大于90%.这为生产高纯ClO₂发生器以及用高纯ClO₂消毒的必要性提供了重要的科学依据.     

生态工业园建设中的绿色物流规划研究

通过分析现代物流对生态工业园建设带来的环境影响,论述了在可持续发展原则下的绿色物流战略;并以苏州新加坡工业园为例,探讨了绿色物流的发展模式,以及这种模式对生态工业园建设的意义。     

基于PCA与改进AHP-CRITIC法的地质灾害风险评价研究——以神木市为例

神木市是西部地区重要的能源城市,对能源的过度开发利用引发了大量地质灾害,严重阻碍着居民生产生活和城市发展建设,因此开展地质灾害风险评价研究是该地区可持续发展的必由之路。为解决多因子综合作用对评价精度的影响,根据神木市地质环境及社会经济情况选取合适的评价因子分别建立危险性和易损性评价体系,利用主成分分析（PCA）法判断、提取主成分来避免因子间相关性的干扰,计算各因子综合分值得到危险性区划图;首次将改进层次分析（AHP）-CRITIC主客观组合赋权法应用于承灾体易损性评价当中,通过该方法计算因子综合权重得到各乡镇易损指数。叠加危险区划图和易损指数图完成神木市地质灾害风险性分区,将风险区划为高、较高、中、较低和低五个等级,分别占全市面积的5.31%、7.72%、14.17%、17.08%和55.72%,表明研究区风险等级中等偏低。可为同类型地区地质灾害风险评价工作提供参考依据。