Will spent mushroom substrate application affect the dissipation and plant uptake of phthalate esters?

Journal of Soils and Sediments - The objective of this study was to investigate whether spent mushroom substrate (SMS) amendment was an appropriate way to reduce di(2-ehylhexyl) phthalate (DEHP)...     

Possibility of using a SPAD chlorophyll meter to establish a normalized threshold index of nitrogen status in different potato cultivars

Leaf SPAD values are thought to be an indicator of potato nitrogen (N) status; however, when making plant N diagnosis, no single threshold leaf SPAD value can be used for all potato cultivars because of cultivar variation. We conducted field experiments over 3?years to test whether the difference in SPAD values between the upper and lower leaves was consistent among potato cultivars, and whether this value responded to N application levels. The results showed cultivar affects the SPAD values of the fourth and eighth leaves (SPAD_L4 and SPAD_L8), but not SPAD_L4-8, the difference between SPAD_L4 and SPAD_L8. Moreover, the SPAD_L4-8 values responded well to N application levels. Therefore the SPAD_L4-8 could be applied as a general index of N status across different potato cultivars, and establishing a threshold SPAD_L4-8 value might be more useful in guiding N fertilization recommendations for different potato cultivars.     

尤溪县野生茜草科植物资源开发利用探讨

经调查,发现福建省尤溪县野生茜草科植物共有22属,44种(包括变种)。对该区野生茜草科植物的种类、优势属、数量与利用价值进行分析,同时提出保护与开发利用建议。     

海城林木害虫天敌姬蜂调查初报

2014年至2017年,利用网捕法、灯光诱集法与室内饲养法,对海城市天敌姬蜂进行调查研究。鉴定出海城地区林木害虫天敌姬蜂种类14亚科46属60种,提供了海城市已知种类分布名录,为海城市森林病虫害生物防治奠定了坚实基础。     

一种可扩展的多功能低压接户横担

针对目前常州市老城区及农村私房低压接户线布线环境复杂,强弱电导线混杂,可用通道资源紧张的情况,提出一种可扩展的多功能低压接户横担结构,既可以作为直线横担,为0.4kV绝缘接户线和其他通信、电话线提供通道资源,也可通过扩展结构成为转角横担和双回路横担,扩容接户线通道,提高了通道建设效率,降低了接户线维护成本和故障发生率。     

气候变化对荒漠区5种主要灌木植物物候的影响

物候常作为指示气候变化的一项可靠指标,基于物候资料分析气候变化对荒漠区5种灌木物候的影响,对阐明荒漠生态系统碳循环具有重要意义。因此,本研究采用一元线性回归法和相关分析法对阿拉善左旗荒漠区5种灌木30年来的物候及其对应的气象数据进行了分析,结果表明,1)1983-2012年研究区增温明显,气温平均增幅0.43℃·10a-1,降水量无显著变化,气候朝着暖干化方向发展;2)5种灌木春季物候均表现出提前的趋势,枯黄期则表现出显著的提前或不明显的推后趋势,生长季长度有所延长;3)3月均温、4月均温和10月均温对研究区5种灌木物候期影响显著,月降水量仅与白刺(Nitraria tangutorum)的春季物候期呈显著(P0.05)或极显著(P0.01)的相关关系。     

加强法制建设,落实生猪屠宰厂(场)主体责任的思考

屠宰厂(场)开展入场查物验证和肉品品质检验是落实主体责任的重要体现。目前相关法律法规对屠宰厂(场)未履行查物验证义务缺少处罚依据,对肉品品质检验的人员资质、人数和印章使用的规定不够详细,肉品品质检验合格证填写烦琐。为了更好地落实屠宰厂(场)主体责任,应增加对屠宰场不履行入场查物验证的处罚法律依据,明确肉品品质检验员专业、人数和健康证的要求,规范和简化肉品品质检验合格证的填写。     

基于摩擦温升校验的往复泵密封件设计

为了避免中高压往复泵的密封件因摩擦温升而快速磨损或破坏,在选择和设计往复泵密封件时要对其摩擦温升进行分析计算,保证摩擦面最高温度不超过密封材料的许用温度.摩擦面最高温度主要由环境温度、摩擦接触体温升、摩擦面温升3个因素决定.考虑以上因素,推导了往复泵接触体温升计算公式,并在经典摩擦面温升解析计算公式的基础上,提出了1种基于摩擦面温升的往复泵密封件设计校验简洁公式.通过与试验结果对比,验证了校验式的适用性.研究结果从摩擦温升角度为往复运动密封件的选择与设计提供了参考.     

Analysis of Field Test High-Speed Railway CFG Pile-Raft Composite Foundation

Based on settlementation control design, CFG pile-raft composite foundation was used in the Shanghai-Nanjing intercity railway embankment test. To explore the settlement control mechanism and bearing characteristics of the CFG pile-raft composite foundation,embankment settlement, pile-soil stress distribution and the dissipation of excess pore water pressure were observed to obtain data through field testing. Composite foundation settlement, lateral deformation of subgrade soil, pile-soil stress distribution along the lateral base and excess pore water pressure changes with time under embankment were analyzed. The change pattern of pile-soil stress ratio and load sharing ratio were studied. Field test results provide the experimental basis for the further theoretical studies and optimized practial design of the soft foundation treatment in the CFG pile - raft structure in the high-speed railway project.