Context Modeling for Ranking and Tagging Bursty Features in Text Streams

Bursty features in text streams are very useful in many text mining applications. Most existing studies detect bursty features based purely on term frequency changes without taking into account the semantic contexts of terms, and as a result the detected bursty features may not always be interesting or easy to interpret. In this paper we propose to model the contexts of bursty features using a language modeling approach. We then propose a novel topic diversity-based metric using the context models to find newsworthy bursty features. We also propose to use the context models to automatically assign meaningful tags to bursty features. Using a large corpus of a stream of news articles, we quantitatively show that the proposed context language models for bursty features can effectively help rank bursty features based on their newsworthiness and to assign meaningful tags to annotate bursty features. ? 2010 ACM.EI

Relation between axial length and ocular parameters

AIM: To investigatethe relation between axial length(AL), age and ocular parameters.<p>METHODS: A total of 360 subjects(360 eyes)with emmetropia or myopia were recruited. Refraction, center corneal thickness(CCT), AL, intraocular pressure(IOP)were measured by automatic-refractor, Pachymeter, A-mode ultrasound and non-contact tonometer, respectively. Corneal curvature(CC), anterior chamber depth(ACD)and white-to-white distance(WWD)were measured by Orbscan II. Three dimensional frequency domain coherent optical tomography(3D-OCT)was used to examine the retinal nerve fiber layer thickness(RNFLT). The Pearson correlation coefficient(<i>r</i>)and multiple regression analysis were performed to evaluate the relationship between AL, age and ocular parameters.<p>RESULTS: The average AL was 24.15±1.26mm. With elongation of the AL, spherical equivalent(SE)(<i>r</i>=-0.742,<i>P</i><0.01), CC(<i>r</i>=-0.395, <i>P</i><0.01)and RNFLT(<i>r</i>=-0.374, <i>P</i><0.01)all decreased, while the mean ACD(<i>r</i>=0.411, <i>P</i><0.01)increased. On the contrary, there was not statistical significan with CCT(<i>r</i>=0.099, <i>P</i>=0.060)and WWD(<i>r</i>=0.061, <i>P</i>=0.252). There was also a significant correlation between AL and age(<i>P</i>=0.001), SE(<i>P</i><0.001), ACD(<i>P</i><0.001), CC(<i>P</i><0.001)in Multiple linear regression analysis.<p>CONCLUSION: In longer eyes, there is a tendency toward myopia, a flatter cornea, a deeper ACD and a thinner RNFLT. Age is an influencing factor for the AL as well

Value Creation in B2B E-Markets of China: A Practical Perspective

In China, the development of e-market has unique characteristics in the transactional processes and market mechanisms, which relate largely to the current industry structure, financial infrastructure and organization structure. This paper seeks to develop a conceptual model of B2B e-market value creation strategy, and can also be used to highlight the complexity of such activities for Chinese B2B e-markets. A process-oriented approach to modelling the value of e-market, rather than strategic position theory or a simple descriptive approach, is found to be more suitable and has been selected. The model consists of two dimensions: the e-commerce process and the controlling complexity. We apply the model in an actual Chinese B2B e-market (Alibaba.com). The crucial value creation activities and strategies in the four phases of e-commerce process are identified, and the controlling complexity of these activities is evaluated in the model. The model offers an effective approach to study the dynamic structure of transactional processes and bring into light the special issues of e-market development in China. Managers can resort to the model to offer more value to their customers by designing an effective e-market process

The Role of Branched-Chain Amino Acids and Branched-Chain α-Keto Acid Dehydrogenase Kinase in Metabolic Disorders

Branched-chain amino acids (BCAAs), composed of leucine, isoleucine, and valine, are important essential amino acids in human physiology. Decades of studies have revealed their roles in protein synthesis, regulating neurotransmitter synthesis, and the mechanistic target of rapamycin (mTOR). BCAAs are found to be related to many metabolic disorders, such as insulin resistance, obesity, and heart failure. Also, many diseases are related to the alteration of the BCAA catabolism enzyme branched-chain α-keto acid dehydrogenase kinase (BCKDK), including maple syrup urine disease, human autism with epilepsy, and so on. In this review, diseases and the corresponding therapies are discussed after the introduction of the catabolism and detection methods of BCAAs and BCKDK. Also, the interaction between microbiota and BCAAs is highlighted

The one-dimensional polymer poly[[aqua­(2,2′-bipyridine)cadmium(II)]-μ-trans-stilbene-4,4′-dicarboxyl­ato]

In the title polymer, [Cd(C16H10O4)(C10H8N2)(H2O)]n, the CdII ion is in a strongly distorted octa­hedral geometry, being coordinated by two N atoms from a 2,2′-bipyridine ligand, three carboxylate O atoms from two symmetry-related trans-stilbene-4,4′-dicarboxyl­ate dianions and one water mol­ecule. The stilbene ligand lies on an inversion centre at the midpoint of the central C=C bond. This feature generates the polymeric structure: adjacent CdII ions are bridged by trans-stilbene-4,4′-dicarboxyl­ate dianions, giving rise to a one-dimensional structure. The coordinated water mol­ecule is involved in interchain O—H⋯O hydrogen bonds

Poly[[(μ-1H-benzimidazole-5,6-dicarboxyl­ato)zinc(II)] monohydrate]

The three-dimensional polymeric title compound, {[Zn(C9H4N2O4)]·H2O}n, contains one crystallographically independent ZnII atom, one fully deprotonated 1H-benzimid­azole-5,6-dicarboxyl­ate (bdc) ligand and one uncoordinated water mol­ecule. The ZnII atom is four-coordinated by three O atoms and one N atom from the bdc ligands, giving a distorted tetra­hedral coordination geometry. The uncoordinated water mol­ecule is bound to the main structure through a strong bdc–water N—H⋯O hydrogen bond, and two much weaker water–bdc O—H⋯O inter­actions

Tetra-μ-acetato-κ4 O:O′;κ3 O,O′:O′;κ3 O:O,O′-bis­[(acetato-κ2 O,O′)(1,10-phenanthroline-κ2 N,N′)europium(III)]

In the title centrosymmetric dinuclear EuIII complex, [Eu2(CH3COO)6(C12H8N2)2], each EuIII cation is coordinated by seven O atoms from five acetate anions and two N atoms from one phenanthroline ligand in a distorted tricapped trigonal-prismatic geometry. Four acetate anions bridge two EuIII cations to form the dinuclear complex, with an Eu⋯Eu distance of 3.9409 (8) Å. Weak inter­molecular C—H⋯O hydrogen bonding is present in the crystal structure

Increasing the Environmental Sustainability of Greenhouse Vegetable Production by Combining Biochar Application and Drip Fertigation—Effects on Soil N2_{2}O Emissions and Carbon Sequestrations

Drip fertigation with reduced fertilizer and water inputs has been widely used in greenhouse vegetable production in China. However, farmers usually do not apply additional organic material with a high carbon content, although soil organic carbon (SOC) concentrations are mostly below the optimum level for vegetable production. Returning straw or biochar to fields is an effective strategy for sustainability and environmental friendliness. We tested whether drip fertigation, (DIF) combined with maize straw (DIF+S) or biochar (DIF+BC), is a suitable option to improve SOC sequestration over eight growing seasons, and how these options affect soil N$_{2}$O emissions and yields or partial factor productivity of applied N (PFP$_{N}$) of crops over three growing seasons. During the winter–spring growing season, DIF+BC significantly reduced soil N$_{2}$O emission by 61.2% and yield-scaled N$_{2}$O emission by 62.4%, while increasing the tomato yield and PFP$_{N}$ compared with DIF. Straw incorporation had similar trends but without significant effects. Conversely, straw and biochar incorporation increased N$_{2}$O emission during the autumn–winter season. The structural equation model indicated N$_{2}$O emission was dominantly driven by soil NH$_{4}$$^{+}$-N concentration, temperature and moisture. The N$_{2}$O emission factor decreased significantly with increased PFP$_{N}$. Moreover, the contribution of biochar to the increased SOC was approximately 78%, which was four times higher than that of straw incorporation. Overall, the results highlighted the potential of drip fertigation with biochar incorporation to mitigate N$_{2}$O emissions, improve PFP$_{N}$ and significantly increase SOC storage, which could all contribute to maintaining environmental sustainability and soil quality of greenhouse vegetable production