活性炭对糖浆脱色效能的研究

通过实验与回归分析，得出了福建粉炭等六种国产粉央对复筛原糖糖浆脱色的吸附等温线，用于评价活性对糖浆的脱色效能，在实验条件下，江西德兴粉炭的脱色效能较佳。     

MEASUREMENT OF ANODIC OVERVOLTAGE BY AMODIFIED CURRENT INTERRUPTION METHOD IN CRYOLITE-ALUMINA MELTS

１ＩＮＴＲＯＤＵＣＴＩＯＮＩｎｔｈｅｅｌｅｃｔｒｏｌｙｔｉｃｐｒｏｄｕｃｔｉｏｎｏｆａｌｕｍｉｎｉｕｍ，ｔｈｅｃｅｌｃｏｎｓｉｓｔｓｏｆａｃａｒｂｏｎａｎｏｄｅａｎｄａｎａｌｕｍｉｎｉｕｍｍｅｔａｌｃａｔｈｏｄｅ．Ｔｈｅｄｏｍｉｎａｎｔｐｏｔｅｎｔ...     

Molecular dynamics study of solid state interfacial reaction in the Ni-Mo system

Based on the Finnis–Sinclair formalism, an n-body Ni-Mo potential is constructed and the potential with optimized parameters is able to reproduce some physical properties of several Ni-Mo alloy phases. Molecular dynamics simulation with the constructed potential is performed to study the detailed process of solid-state interfacial reaction in the Ni/Mo multilayers upon isothermal annealing at medium temperatures. It is found that in the sandwich model or the bilayer model, interfacial reaction can take place down to 350 °C and is initiated through interface-crossing atomic diffusion, resulting in alloying and amorphization. The planar growth of the amorphous interlayer shows an asymmetric behavior, i.e., consuming the Ni lattice at a higher speed than the Mo lattice, leading to some intermediate stages where an Ni-enriched amorphous phase coexists with a small amount of unreacted Mo crystal. Moreover, it is revealed that 21 at.% Mo atoms in the Ni lattice reaches a critical value, resulting in a crystal-to-amorphous transition, while the critical concentration for collapsing of the Mo lattice is up to 25 at.% Ni. It follows that the above difference in the solubilities is regarded as the physical origin of asymmetric growth. Kinetically, the growth of the amorphous layer is found to follow a t ^1/2 law, indicating that solid-state amorphization is indeed through a diffusion-limited reaction. This revised version was published online in July 2006 with corrections to the Cover Date.     

Stand alone intelligent digital distance relay

Remote end infeed causes problems in distance relay especially under high resistance earth fault conditions. Although a distance relay set to an ideal operating region can cover the fault resistance at one particular load condition, the operating region is affected by changes in load condition. Hence a distance relay may overreach or underreach when load changes. From the main factors which affect the ideal digital distance relay operating region, a stand alone intelligent digital distance relay which can adapt to these changes is presented. This approach does not need communication links from the remote end of the line or the system control center. Numerous computer simulations have been carried out on realistic system configurations and the results show that there is a high potential for developing an intelligent digital distance relay     

渤海海域天然气勘探前景

渤海海域油气勘探已进行了30多年，在天然气勘探方面，仅仅找到一些中、小型天然气田（藏），在综合分析盆地类型，天然气成因和富气凹陷形成条件的基础上，认为渤海海域是一个相对以油为主的油气区，天然气以油型气和陆源有机气为主，天然气藏可能以中、小型为主，由于目前天然气资源量探明度低，因此渤海海域仍具有一定的天然气勘探前景。     

用EXCEL处理物性分析数据

介绍一咱在ＥＸＣＥＬ环境下处理物性分析数据的方法。它应用了垢计算功能和函数，使得数据处理报告制作过程步骤清晰简捷明了。这种方法的建立过程与以前所用的物性数据处理方法相比，具有简单，改动容易，便于掌握和使用等优点，尤其在处理探井分析数据时更具优越性。     

A hybrid of sequential rules and collaborative filtering for product recommendation

Customers’ purchase behavior may vary over time. Traditional collaborative filtering (CF) methods make recommendations to a target customer based on the purchase behavior of customers whose preferences are similar to those of the target customer; however, the methods do not consider how the customers’ purchase behavior may vary over time. In contrast, the sequential rule-based recommendation method analyzes customers’ purchase behavior over time to extract sequential rules in the form: purchase behavior in previous periods ⇒ purchase behavior in the current period. If a target customer’s purchase behavior history is similar to the conditional part of the rule, then his/her purchase behavior in the current period is deemed to be the consequent part of the rule. Although the sequential rule method considers the sequence of customers’ purchase behavior over time, it does not utilize the target customer’s purchase data for the current period. To resolve the above problems, this work proposes a novel hybrid recommendation method that combines the segmentation-based sequential rule method with the segmentation-based KNN-CF method. The proposed method uses customers’ RFM (Recency, Frequency, and Monetary) values to cluster customers into groups with similar RFM values. For each group of customers, sequential rules are extracted from the purchase sequences of that group to make recommendations. Meanwhile, the segmentation-based KNN-CF method provides recommendations based on the target customer’s purchase data for the current period. Then, the results of the two methods are combined to make final recommendations. Experiment results show that the hybrid method outperforms traditional CF methods.     

Cr6Mn13Ni10／Cr5Mo异质接头时效过程中碳的扩散行为

Ｃｒ６Ｍｎ１３Ｎｉ１０／Ｃｒ５Ｍｏ异质金属焊接接头在时效过程中，其熔合区域的扩散行为不同于以往的Ａ／Ｆ异质焊接接头，时效初期奥氏体钢一侧有一定宽度的增碳层，随时效时间延长，增碳层反而逐渐变窄；时效温度越高，上述现象越明显，经７００℃，时效５０ｈ后增碳层可完全消失。     

Development of a PCR assay for the detection of nifH and nifD genes in indigenous photosynthetic bacteria

Molybdenum (Mo) nitrogenases consist of two components: dinitrogenase reductase (encoded by nifH) and the dinitrogenase or MoFe protein (encoded by nifDK). Nitrogenase enzyme of photosynthetic bacteria is responsible for hydrogen production. Therefore, primers were designed for the nitrogenase gene only. In this study, two primers (ND and NH) were designed after comparative genomic analysis of nifH and nifD gene sequences from public databases. The designed primers were used for the amplification of nifH and nifD genes to detect nitrogenase genes in photosynthetic bacteria. Initial detection was done using a monoplex Polymerase Chain Reactions (PCRs) followed by optimization of the PCR protocols. Subsequently, a duplex PCR was designed for amplification and detection of nifH and nifD genes in indigenous photosynthetic bacteria. Evaluation of the duplex PCR on six samples isolated from Palm Oil Mill Effluent (POME) showed that only four isolates contained both the nifH and nifD genes, indicating that these isolates were potential hydrogen-producing bacteria. PCR detection provides a rapid and efficient pre-identification of potential photosynthetic bacterial hydrogen producers.     

Advanced treatment of biologically pretreated coking wastewater by electrochemical oxidation using boron-doped diamond electrodes

Electrochemical oxidation is a promising technology to treatment of bio-refractory wastewater. Coking wastewater contains high concentration of refractory and toxic compounds and the water quality usually cannot meet the discharge standards after conventional biological treatment processes. This paper initially investigated the electrochemical oxidation using boron-doped diamond (BDD) anode for advanced treatment of coking wastewater. Under the experimental conditions (current density 20-60 mA cm⁻², pH 3-11, and temperature 20-60 °C) using BDD anode, complete mineralization of organic pollutants was almost achieved, and surplus ammonia-nitrogen (NH₃-N) was further removed thoroughly when pH was not adjusted or at alkaline value. Moreover, the TOC and NH₃-N removal rates in BDD anode cell were much greater than those in other common anode systems such as SnO₂ and PbO₂ anodes cells. Given the same target to meet the National Discharge Standard of China, the energy consumption of 64 kWh kgCOD⁻¹ observed in BDD anode system was only about 60% as much as those observed in SnO₂ and PbO₂ anode systems. Further investigation revealed that, in BDD anode cell, organic pollutants were mainly degraded by reaction with free hydroxyl radicals and electrogenerated oxidants (S₂O₈²⁻, H₂O₂, and other oxidants) played a less important role, while direct electrochemical oxidation and indirect electrochemical oxidation mediated by active chlorine can be negligible. These results showed great potential of BDD anode system in engineering application as a final treatment of coking wastewater.