水和废水中汞的快速检测方法研究

介绍了检测管法快速测定水和废水中汞的方法，研制了检测管并测试了检测管的精密度、准确度、干扰因素等指标．     

弹簧支吊架在管道设计上的应用

安全生产、环境保护，对技术密集、连续化生产，易燃易爆的石油化工企业尤为重要。炼油厂装置区装有带油、带压，有毒可燃、腐蚀性物料和气体的设备及管道，对炼厂的安全，环保构成威胁。如何在管道设计过程中合理设计是保证管道和设备正常运行的关键     

螺旋钢管盘制成形的一种新方法

对如何在三辊卷板机上进行盘制螺旋钢管、盘管所用模具及成形工艺作了介绍.     

大口径薄壁无缝铝管变薄旋压工艺

介绍采用离心铸坯——变薄旋压方法制作大口径薄壁铝管的工艺.包括简要工艺流程、特点、适用范围等.该工艺为解决国内大口径薄壁无缝铝管提供了新的途径.     

Anaerobic digestion in mesophilic and room temperature conditions: Digestion performance and soil-borne pathogen survival

Tomato plant waste(TPW) was used as the feedstock of a batch anaerobic reactor to evaluate the effect of anaerobic digestion on Ralstonia solanacearum and Phytophthora capsici survival. Batch experiments were carried out for TS(total solid) concentrations of 2%, 4% and 6% respectively, at mesophilic(37 ± 1°C) and room(20–25°C) temperatures. Results showed that higher digestion performance was achieved under mesophilic digestion temperature and lower TS concentration conditions. The biogas production ranged from 71 to 416 L/kg VS(volatile solids). The inactivation of anaerobic digestion tended to increase as digestion performance improved. The maximum log copies reduction of R. solanacearum and P. capsici detected by quantitative PCR(polymerase chain reaction) were 3.80 and 4.08 respectively in reactors with 4% TS concentration at mesophilic temperatures. However, both in mesophilic and room temperature conditions, the lowest reduction of R. solanacearum was found in the reactors with 6% TS concentration, which possessed the highest VFA(volatile fatty acid) concentration. These findings indicated that simple accumulation of VFAs failed to restrain R. solanacearum effectively, although the VFAs were considered poisonous. P. capsici was nearly completely dead under all conditions. Based on the digestion performance and the pathogen survival rate, a model was established to evaluate the digestate biosafety.     

Hydroforming of locally heat treated tubes

In tube hydroforming, the process chain can be very long as it may involve several pre-forming operations (e.g. bending, crushing, end forming, etc.) which are usually followed by an intermediate annealing stage. Conventional annealing is performed in batches and it is often perceived as a long, relatively expensive and non-environmentally friendly operation. For this reason, in this paper local intermediate heat treatment is proposed as a promising alternative solution, in order to reduce the throughput process time. The study has been carried out on a real tubular motorcycle part, by performing both experiments and numerical simulations, in order to verify whether local annealing can be an effective substitute of conventional global annealing. Several alternative ways of locally heat treating an Al6060 tube right before hydroforming have been investigated. The results demonstrate that a feasible solution can be found, with local heat treatment of relatively small portions of the tube.     

非全量消解-悬浮液进样火焰原子吸收光谱法测定煤灰中的铜和铅

试验了用非全量消解—悬浮液直接进样火焰原子吸收光谱法测定煤灰中的铜和铅，结果表明：铜和铅的方法检出限(3σ)分别为0．038mg／L和0．23mg／L，测定吸光度与其浓度的线性范围均为0．5mg／L—5．0mg／L，样品加标回收率在87％—97％之间，相对标准差(n＝4)小于7％。     

氢化物发生-原子荧光光谱法测定汾河沉积物中的总汞

采用两种不同的消解方法对汾河沉积物中的总汞进行分析,结果表明,王水水浴加热消解法对总汞的消解程度完全而且测定结果比较稳定.探讨了还原剂浓度、栽流浓度以及仪器条件等主要因素对测定的影响,选择了最佳实验条件,检出限为0.0074ng/ml,加标回收率在84%～117%之间.标准参考样品测定结果表明,该方法准确可靠,精度好.     

Cornstarch explosion experiments and modeling in vessels ranged by height/diameter ratios

Height to diameter (H/D) ratio is one of the important parameters affecting premixed particle–air combustion characteristics. This paper focuses on the behavior of cornstarch combustion in closed vessels with changed H/D ratios and fixed volumes; and a combustion model is employed to simulate the experiments. An Eulerian–Lagrangian approach for two-phase flows was used in the model and conservation equations of unsteady turbulent two-phase reacting flows were solved in two-dimensional domains. Heat loss to the vessel walls was taken into consideration in the model. The simulation results have a good agreement with those of experiments. Further simulations were carried out for higher H/D ratios from 8 to 15. These results show that H/D=8 is a changing point. When H/D<8, the maximum pressure and the rate of maximum pressure rise decrease with increasing H/D ratios. While H/D>8, the both have an increasing tendency with increasing H/D ratios.     

土工管袋技术在湖库底泥脱水中的应用研究

为掌握土工管袋充填过程的变化规律及脱水效果,在疏浚船舶和絮凝剂的配合下,通过对土工管袋首次充填过程及后续充填过程进行实验研究,筛选出了最佳的管袋种类、获得了充填过程管袋高度变化曲线、管袋利用效率、底泥脱水后含水率变化曲线以及充填施工过程中的控制方法等技术指标,为土工管袋的工程化提供了指导,为管袋技术的大规模应用和技术集成化奠定了一定的基础。