浅析存款业务创新

从技术角度来探讨银行的存款业务创新，提出商业银行应该考虑经济发展情况、金融文化背景等因素，以满足客户的需求为目的来设计、组织存款要素，并在市场细分的基础上，提供差别化存款产品，按市场规律进行定价。     

电除尘器的设计与探讨

介绍了电除尘器的工作原理、结构特性、基本参数和总体设计计算。这种电除尘器可广泛使用于冶金、化工、轻工 ,水泥和矿山等工业部门 ,随着人们对生态环境质量要求的不断提高 ,电除尘器将成为环保的重要设备     

碱熔法回收废催化剂中的钴、钼和铝

采用碱熔法从废钴钼催化剂中回收钴、钼和铝。该方法的工艺过程为 :将废催化剂与纯碱按质量比 1∶1 8混合 ,在焙烧温度 90 0℃条件下 ,焙烧 2h ;用 2倍于熔块的沸水浸取30min ;用稀硫酸调浸取液 pH至 6 ,浸取液中的铝形成氢氧化铝被回收 ;然后除盐并回收钼酸钠 ;使酸浸黑渣中的钴形成氢氧化钴并脱水氧化成为氧化钴。用该工艺回收铝、钼和钴 ,其回收率可达 95 %以上 ,回收产品的纯度可达 97%以上。     

华东某铀矿区周边河流表层沉积物的天然放射性评价

利用高纯锗γ能谱分析仪测量中国华东某铀矿区附近河流沉积物的放射性核素比活度,计算γ辐射吸收剂量率(D)、有效镭浓度(Ra_(eq))、外照射指数(H_(ex))、内照射指数(H_(in))、年有效剂量当量(AEDE(室内和室外))和年性腺剂量当量(AGDE)等放射性参数,并开展沉积物的放射性危害评估,最后通过Pearson线性系数确定放射性核素比活度之间的相关性。结果表明,河流沉积物中放射性核素~(238)U、~(226)Ra、~(232)Th和40K的平均比活度分别为51.55、37.32、57.63和756.86 Bq·kg~(-1),除~(226)Ra外,其他放射性核素的比活度均高于中国平均值;距离污染区较远或存在河流稀释作用的区域,沉积物的天然放射性核素处于正常水平,作为建筑材料使用时比活度不存在超标;放射性核素~(238)U、~(226)Ra和~(232)Th之间存在显著相关性。     

Utilizing vortex behaviour to minimize drift

Abstract

The ULV spray emitted from a TBM flying in a cross wind was mapped by a scanning lidar system. The fate of the spray cloud for 2 min after release from the aircraft was followed as the material was transported downwind of the flight line. Vertical scans at 6 s intervals with 1 m^‐3 resolution provided detailed insight into the entrainment of the spray into the wing‐tip vortices and ultimate release to drift or deposit. Relative concentration, dosage and deposit profiles are presented for this cross‐wind case. Vortex lifetimes were found to be significantly different for the up‐wind and downwind vortices. The majority of the near field deposit was associated with the up‐wind vortex while the drift was linked to the down‐wind vortex.     

Foliar and ground deposits of fenitrothion following aerial application over a plantation forest

Abstract

Spray deposits were measured on spruce foliage at tree canopy level and on glass plates at ground level, after aerial application of an emulsion formulation of fenitrothion at the rate of 0.21 kg AI in 1.46 L per ha over a 16 ha plot in a plantation forest. Fenitrothion deposits were quantified by gas‐liquid chromatography. A wide variation was observed in deposits on foliage and at the forest floor. Deposits were relatively higher on foliar samples collected from the upwind side of a tree canopy than those on the downwind side. Similarly, the glass plate placed under a tree on the upwind side received relatively higher deposit than the one on the downwind side. However, the glass plates placed in the adjacent forest openings collected markedly higher deposits. Results clearly indicate filtration of the spray droplets by canopy foliage. Assessment of the average deposit of fenitrothion at ground level (mean deposit from all sampling locations) indicated that ca. 19.4% of the applied material reached the forest floor. Within a sampling station, correlation was poor between foliar depsits and those on glass plates under the same trees or in nearby clearings. Analysis of fenitrothion deposits on foliage collected at 1 and 2 h after application indicated that the droplets took, more than 1 h for deposition on the tree canopy. On the other hand, deposition on the glass plates at ground level appeared to be practically complete within 1 h post‐treatment. This was attributed to the higher sedimentation velocities of the larger droplets which tend to travel faster to the floor level than the smaller droplets which float for a longer period near the tree canopy.     

高浊度钼矿浮选废水的混凝沉淀

针对某钼矿选矿厂浮选废水,以PAC、PFS和FeCl3为凝聚剂,以APAM-A和APAM-N为絮凝剂,以H2SO4和NaOH为pH调整剂,研究了不同混凝剂、不同pH值和不同水力条件下废水处理后的浊度和COD.实验结果表明,在最佳水力条件下,原水pH不调整,以APAM-A为絮凝剂,以PAC为凝聚剂,其用量分别为15 g/t,750g/t时,处理后上清液浊度为25 NTU,COD小于30 mg/L.浮选废水经处理后回用于选矿浮选流程,大大改善了选矿指标.     

Mercury deposition/accumulation rates in the vicinity of a lead smelter as recorded by a peat deposit

Mercury (Hg) concentration profiles and historical accumulation rates were determined in three ²¹⁰Pb-dated cores from a peat deposit in the vicinity of a lead (Pb) smelter at Příbram, Czech Republic. The Hg concentrations in peat samples ranged from 66 to 701 μg kg⁻¹. Cumulative Hg inventories from each core (for the past 150 yr) varied by a factor of 1.4 (13.6–18.5 mg Hg m⁻²), indicating variations of net Hg accumulation rate within the peat deposit. Historical changes in vegetation cover (leading to variable interception by trees) are probably responsible for this variation in space and time. The uncorrected Hg accumulation rates peaked between the 1960s and 1980s (up to 226 μg m⁻² yr⁻¹). Recent findings show that Hg records from peat tend to overestimate historical levels of Hg deposition. Therefore we used the mass loss compensation factor (MLCF) to normalize Hg accumulation rates. These corrected Hg accumulation rates were significantly lower (maximum 129 μg m⁻² yr⁻¹) and better corresponded to changes in historical smelter emissions, which were highest in the 1960s. The agreement between the corrected Hg accumulation rates in the uppermost peat sections (2–38 μg m⁻² yr⁻¹) and biomonitoring of atmospheric deposition by mosses in several recent years (4.7–34.4 μg m⁻² yr⁻¹) shows the usefulness of MLCF application on Hg accumulation in peat archives. However, the MLCF correction was unsuitable for Pb. The recent Pb deposition rates obtained by an independent biomonitoring study using mosses (0.5–127 mg m⁻² yr⁻¹) were better correlated with net Pb accumulation rates recorded in peat (7–145 mg m⁻² yr⁻¹) than with corrected rates obtained by the MLCF approach (1–28 mg m⁻² yr⁻¹).     

大井银铜锡矿体—一个潜火山热液矿床的特征和成因

大井银铜锡矿床是我国在金属组合上较为罕见的矿床之一。过去,该矿床曾被认为是与花岗岩有关的中深成热液矿床。作者从矿区潜火山侵入体与矿区东侧侏罗纪火山层序对比、矿床地质特征(包括矿体、矿石、金属矿物及金属分带)以及成矿作用地球化学等方面的资料和数据,论证了该矿床是一个浅成的潜火山热液矿床。     

德国双元系统对电子废弃物回收的启示

本文回顾了德国双元系统在包装物回收领域取得的成功，探讨了此系统应用于电子废弃物回收的可行性与优势。针对电子废弃物的特性，本文提出了一系列相应的改进措施，使德国双元系统能够适用于电子废弃物的回收。