基于关联性及趋势性分析的AVHRR NDVI及#br# MODIS NDVI数据产品比较

针对AVHRR NDVI和MODIS NDVI数据集中不同数据产品间的差异和区域适应性问题，利用2003~2013年重叠时间段MODIS Terra/Aqua的NDVI Collection 5(C5)和Collection 6(C6)产品以及AVHRR NDVI中的GIMMS NDVI3g产品，选择汉江流域典型区域进行数据对比分析。通过关联指数IOAs(Index of Association)来评价各数据在季节波动上的一致性；采用Mann Kendall检验分析各数据的长期趋势差异。结果表明，在季节性变化上，同一卫星不同版本产品之间的关联性相对较高。在年际变化上，GIMMS产品相对MODIS 产品，仅能检出部分NDVI变化趋势。在地表覆被异质性相对较高地区，GIMMS产品的长期变化趋势检出率较低。MODIS Terra的NDVI C5产品受传感器退化影响，表现出相对较高的减少趋势。 关键词： GIMMS NDVI；MODIS NDVI；Mann Kendall检验；趋势分析     

蒽醌修饰石墨毡电极预处理头孢合成废水

以钛涂钌电极为阳极、自制蒽醌修饰石墨毡电极为阴极,对头孢合成废水(COD=25 000~30 000 mg/L、ρ(NH3-N)=850~1 300 mg/L、色度为2 300~2 680度)进行了电化学氧化预处理,优化了电解条件,并对电化学体系的动力学和稳定性进行了分析。实验结果表明:蒽醌的存在可改善电化学氧化降解效果;在电解时间50 min、电流密度0.14 A/cm2、Na2SO4浓度0.1 mol/L、极板间距2 cm、初始废水p H 7.0的条件下,废水的COD、色度、NH3-N的去除率分别可达45.3%,66.9%,33.6%;BOD5/COD由处理前的0.27增至0.40,可生化性得到改善;COD、色度、NH3-N的电化学氧化降解过程均近似符合一级动力学方程;且该电化学体系的应用稳定性良好。     

Seasonal variations in microcystin concentrations in Lake Taihu, China

An enzyme-limited immunosorbent assay (ELISA) was used to monitor spatial and temporal variation of microcystins (MCs) in Lake Taihu. MC concentrations were higher in summer and autumn than in other seasons. Maximal MC concentration was 15.6 mug L(-1). Compared to central Lake Taihu and Wuli Bay, Meiliang Bay had higher MC concentrations due to high biomass of Microcystis.     

深冲钢板塑性变形形为研究

单相塑性材料的强度和塑性基本上是分别研究讨论的。此文以低碳深冲钢板为例,从能量观点出发,讨论了强度和塑性的内在制约关系,唯象地提出了单相塑性材料塑性破坏的判据,并解释了几个实验现象。此文的研究有助于加深对深冲钢塑性变形形为的理解。     

Modification of ferrite–manganese oxide sorbent by doping with cerium oxide

Fe–Mn oxide and Ce-doped Fe–Mn oxide sorbents were studied on the structural and desulfurization behavior in COS removal from syngas. The effects of cerium oxide on the Fe–Mn oxides have been investigated by XRD, BET, TPR, XPS and TEM methods. Analysis data show that the Ce-doped sorbent has larger specific surface area and better particles’ dispersion compared with non-modified Fe–Mn sorbent. The addition of Ce improves the reduction performance of Fe–Mn species. The desulfurization experiments show that the desulfurization activity of sorbent can be increased because of the promotion of the structural and redox properties by ceria doped. The Ce-doped sorbent can reduce COS from 15,000 ppmv to less than 0.1 ppmv at 325 °C and a space velocity of 1000 h⁻¹.     

黄孢原毛平革菌处理染料废水过程中细胞结构损伤效应研究

利用透射电子显微镜观察分析白腐真菌(黄孢原毛平革菌)在处理染料废水活性艳红X-3B过程中,染料和盐度对黄孢原毛平革菌的细胞结构产生的毒性作用.结果表明:活性艳红X-3B染料对黄孢原毛平革菌产生生物毒性作用,且随着染料浓度的增加,细胞受损伤程度不断加深.加入100 mg/L的染料活性艳红X-3B后,黄孢原毛平革菌菌丝细胞形态发生变化,出现质壁分离现象;染料浓度进一步加大,菌丝细胞超微结构受到损伤逐渐严重.染料废水中的盐度对黄孢原毛平革菌细胞也会造成损伤,且损伤程度随盐度增大而增大.NaCl浓度为3 g/L时,菌丝细胞发生质壁分离;而当NaCl加入量高于8 g/L时,细胞膜受损,线粒体、细胞核呈现空泡化,表现为受到不可逆的损伤.染料和盐双因子对黄孢原毛平革菌细胞的损伤效应表现为其损伤程度与单因子作用一致,且染料的影响作用占主导.     

用次磷酸钠废渣制备饲料级磷酸三钙

采用高温煅烧工艺，以工业生产次磷酸钠的废渣为原料，制备饲料级磷酸三钙，并对最佳工艺条件进行探讨。最佳工艺条件：煅烧温度600℃、煅烧时间20min。制得的饲料级磷酸三钙中磷的质量分数为16％～18％，符合Q／YHY01—2003《饲料级磷酸三钙》产品质量企业标准。     

劳动保护工作的价值

在市场经济条件下,事物本身的价值决定着它的社会地位。劳动保护工作也同其他事物一样,在生产经营活动中的地位由其本身的价值决定劳动保护工作到底有多大价值?目前尚无理论根据。由于没有价值指标,在以经济效益为中心的生产经营活动中,它的地位就时而重要时而不重要。出事故的时候就重要,不出事故时就不重要。一些企业或基层领导人重生产轻劳动保护,他们认为:生产效益不好,劳动保护再好也没用;劳动保护本身没有效益,效益是间接的;劳动安全是个负效益,只是发生事故造成损失,才能看出“安全效益”。     

β修正罗丹明B光度法测定工业废水中银

对β修正光度法测定废水中痕量银进行了研究，该方法能消除反应液中过量显色剂干扰，提高分析灵敏度和准确度。测定结果表明，银加标回收率９３．０－１０６．０％，精密度ＲＳＤ２．３％，银量低测定浓度０．０２ｍｇ／Ｌ。该方法适合于印相，电镀等行业废水银分析。     

UV/H2O2 oxidation of tri(2-chloroethyl) phosphate: Intermediate products, degradation pathway and toxicity evaluation

Tri(2-chloroethyl) phosphate (TCEP) with the initial concentration of 5 mg/L was degraded by UV/H₂O₂ oxidation process. The removal rate of TCEP in the UV/H₂O₂ system was 89.1% with the production of Cl^? and PO₄^3? of 0.23 and 0.64 mg/L. The removal rate of total organic carbon of the reaction was 48.8% and the pH reached 3.3 after the reaction. The oxidative degradation process of TCEP in the UV/H₂O₂ system obeyed the first order kinetic reaction with the apparent rate constant of 0.0025 min^?1 (R²=0.9788). The intermediate products were isolated and identified by gas chromatography-mass spectrometer. The addition reaction of HO? and H₂O and the oxidation reaction with H₂O₂ were found during the degradation pathway of 5 mg/L TCEP in the UV/H₂O₂ system. For the first time, environment risk was estimated via the “ecological structure activity relationships” program and acute and chronic toxicity changes of intermediate products were pointed out. The luminescence inhibition rate of photobacterium was used to evaluate the acute toxicity of intermediate products. The results showed that the toxicity of the intermediate products increased with the increase of reaction time, which may be due to the production of chlorine compounds. Some measures should be introduced to the UV/H₂O₂ system to remove the highly toxic Cl-containing compounds, such as a nanofiltration or reverse osmosis unit.