Performance of synthetic storm technique in estimating fade dynamics in equatorial Malaysia

In this paper, the synthetic storm technique (SST) is applied to 1‐minute rainfall rate collected from a rain gauge to predict the fade dynamics of the signal in an earth‐to‐satellite link in an equatorial climate location without the needs of satellite beacon measurements. The obtained results are compared with the statistics calculated from measured rain attenuation and with the ITU recommendation model. As for fade duration, a good agreement with measurements has been found together with a significant improvement in terms of prediction errors with respect to the ITU‐R model. Synthetic storm technique is also able to predict fade slope statistics fairly well and has equivalent performance of ITU‐R model.     

云南大姚铜矿银的赋存状态与成矿地质特征

矿床产于白垩系上统长石石英砂岩中,为典型的砂岩型铜矿。对矿床的矿石物质成分,银、铜、金的赋存状态及分布规律和矿床成矿特征研究结果:该矿床的银矿物有辉银矿、自然银、硫铜银矿、硫砷铜银矿、硫铁铜银矿、角银矿、银辉铜矿和银砷黝铜矿8种,其中后5种为本次工作发现;与铜矿带相对应,矿体有银矿物相带,并发现两个不同成因的“高银带”——原生高银带与次生高银带;原生矿体中银的峰值位于铜峰值的东侧,两者相距80～120m,规律性显著;矿床成因类型为多次叠加的沉积热卤水改造矿床;指出了大雪山背斜东翼南部倾伏部位为矿区外围找矿远景区,并在已知铜矿床内提出了两个高银预测区。     

Towards ontology-based multilingual URL filtering: a big data problem

Web content filtering is one among many techniques to limit the exposure of selective content on the Internet. It has gotten trivial with time, yet filtering of multilingual web content is still a difficult task, especially while considering big data landscape. The enormity of data increases the challenge of developing an effective content filtering system that can work in real time. There are several systems which can filter the URLs based on artificial intelligence techniques to identify the site with objectionable content. Most of these systems classify the URLs only in the English language. These systems either fail to respond when multilingual URLs are processed, or over-blocking is experienced. This paper introduces a filtering system that can classify multilingual URLs based on predefined criteria for URL, title, and metadata of a web page. Ontological approaches along with local multilingual dictionaries are used as the knowledge base to facilitate the challenging task of blocking URLs not meeting the filtering criteria. The proposed work shows high accuracy in classifying multilingual URLs into two categories, white and black. Evaluation results conducted on a large dataset show that the proposed system achieves promising accuracy, which is on a par with those achieved in state-of-the-art literature on semantic-based URL filtering.     

A multi-layer perceptron neural network model for predicting the hydrate equilibrium conditions in multi-component hydrocarbon systems

Neural Computing and Applications - This work presents a model based on multilayer perceptron neural network (MLPNN) for the prediction of hydrate equilibrium conditions in hydrocarbon systems. The...     

Automatic segmentation of liver & lesion detection using H-minima transform and connecting component labeling

Automatic segmentation of the liver and the Lesion detection can be a very challenging task due to its variability in size, shape, position and the presence of other organs with similar intensities. Manual segmentation and detection of a tumor is a time-consuming task and greatly depends upon the expertise and experience of the physician. We proposed a method which consists of automatic segmentation and detection of liver and lesion using CT scan modality. H-minima transform filter, Otsu global thresholds, Morphological opening by reconstruction and modified Connected Component Labeling algorithms are applied for liver segmentation. To keep the technique simple and effective, an appropriate range of threshold values are defined to detect different types of lesions. Performance of the proposed system is evaluated and compared with the state-of-the art algorithms. The results of the comparison show that the proposed approach is robust and efficient due to its simplicity. The dice coefficient score for the hepatic segmentation is 94% while sensitivity and specificity for hepatic lesion are 93% and 87% respectively.

     

Electron beam synthesis and characterization of poly(vinyl alcohol)/montmorillonite nanocomposites

Poly(vinyl alcohol) (PVA)/montmorillonite clay (MMT) nanocomposites in the form of films were prepared under the effect of electron beam irradiation. The PVA/MMT nanocomposites gels were characterized by X‐ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and mechanical measurements. The study showed that the appropriate dose of electron beam irradiation to achieve homogeneous nanocomposites films and highest gel formation was 20 kGy. The introduction of MMT (up to 4 wt %) results in improvement in tensile strength, elongation at break, and thermal stability of the PVA matrix. In addition, the intercalation of PVA with the MMT clay leads to an impressive improved water resistance, indicating that the clay is well dispersed within the polymer matrix. Meanwhile, it was proved that the intercalation has no effect on the metal uptake capability of PVA as determined by a method based on the color measurements. XRD patterns and SEM micrographs suggest the coexistence of exfoliated intercalated MMT layers over the studied MMT contents. The DSC thermograms showed clearly that the intercalation of PVA polymer with these levels of MMT has no influence on the melting transitions; however, the glass transition temperature (T_g) for PVA was completely disappeared, even at low levels of MMT clay. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1129–1138, 2006     

Effects of Cu2+ on stability and composition of water soluble ternary polyacrylic acid-Cu2+-protein complexes against radiation damage

Summary The formation of water soluble ternary complexes of polyacrylic acid (PAA) and bovine serum albumin (BSA) in the presence of divalent copper ions was investigated at the neutral pH. Aqueous solutions of PAA, BSA, and their mixture (PAA-BSA, PAA-Cu²⁺-BSA) have been irradiated with ⁶⁰Co -rays and the changes occurred have been measured by high performance liquid chromatography (HPLC) and spectrophotometry. Addition of Cu²⁺ ions to PAA-BSA mixture have been shown to protect the PAA and BSA components of ternary PAA-Cu²⁺-BSA complexes against radiation damage. A structural model of ternary polycomplexes was proposed and the mechanism of observed protection effect was discussed.     

两个具有新骨架结构的二萜生物碱的质谱研究

利用电子轰击质谱（ＥＩＭＳ）、高分辨质谱（ＨＲＭＳ）和碰撞活化谱（ＣＡＭＳ）等方法研究了两个具有新骨架结构的二萜生物碱的质谱，为其质谱裂解规律性研究提供了依据。     

天然气锅炉电控设备的防爆安全性不容忽视

随着我国国民经济建设的飞速发展 ,为了提高环境保护水平 ,合理使用能源 ,创建一个美丽的工作和生活环境 ,煤气、液化气、天然气等资源 ,正逐步走进我们的生活领域 ,燃气灶具、燃气锅炉、燃气汽车 ,在我们的视线中日益增多。而燃气用具和设备的使用 ,离不开可燃气体为其供应燃料 ,因此 ,为满足可燃性气体的安全使用 ,防止发生爆炸事故和保证使用安全便日益引起人们的广泛关注。天燃气是一种挥发性很高的易燃气体 ,其主要成份是 :(甲烷 :CH4 ) 95%、(丙烷 :C3H8) 0 .3%、(丁烷 :C4 H10 ) 0 .3%、(碳 :C5) 0 .4%、(氮 :N2 ) 1 %。这种易燃…