Red-emitting Ln2−xEuxTe2O6:RE (Ln = La, Y; RE = Sm, Gd) phosphors prepared by the Pechini sol-gel method

La_1.90Eu_0.10TeO₆:RE³⁺ (RE = Gd, Sm) and Y₂TeO₆:Eu³⁺nanophosphors were prepared by the Pechini sol-gel process, using lanthanide sesquioxides and telluric acid as precursors. X-ray diffraction (XRD), scanning electron microscopy (SEM), photoluminescence spectra (PL) and fluorescence lifetime were used to characterize the resulting phosphors. The results of XRD indicate that all samples crystallized completely at 1073 K and are isostructural with orthorhombic Ln₂TeO₆. The SEM study reveals that the samples have a strong tendency to form agglomerates with an average size ranging from 40 to 65 nm. The luminescence decay curves suggest for all samples a monoexponential behavior. The photoluminescence intensity and chromaticity were improved for excitation at 395 nm when the co-doping concentration reaches the 1% mol. The optimized phosphorsLa_1.88Eu_0.10Gd_0.02TeO₆and La_1.88Eu_0.10Sm_0.02TeO₆, could be considered an efficient red-emitting phosphor for solid-state lighting devices based on InGaN LEDs.     

豆豉和淡豆豉微生物组与功能成分研究进展

豆豉和淡豆豉作为中国传统大豆发酵食品,其中含有丰富的微生物资源,同时微生物组也可能对其中功能成分如异黄酮、γ-氨基丁酸等物质的含量产生影响。该文综述了组学技术在分析豆豉和淡豆豉发酵过程微生物变化研究中的应用,并对豆豉和淡豆豉中功能成分形成、转化和健康机制研究进行总结,同时根据临床药理学研究,两者中的部分功能成分对包括高血压、抑郁症等慢性病都显示出治疗潜力,通过收集有关其活性物质临床价值的信息,关注相关工艺改革进展,以期为进一步研究和开发豆豉和淡豆豉提供参考。     

Ontogeny of mouthpart sensilla of muga silkworm: A scanning electron microscopic study

Scanning electron microscopy on the postembryonic development of the mouthpart sensory structures of the Muga silk moth, Antheraea assamensis revealed the presence of a variety of sensilla. The types, distribution pattern of the sensilla remained almost the same in the different larval stages except for the number and dimension in some cases. The findings of the study assumes significance because the silk moth, Antheraea assamensis is a species endemic to the North Eastern part of India and very few reports are available on it. In fact, the present study provides the first report on the ontogeny of the mouth part sensilla of the silk moth species. Since mouth part sensilla and their surface micro structural characteristics are extremely important in understanding their roles in searching behavior during feeding, the present study will certainly help in developing strategies for proper rearing of this economically important insect species. Microsc. Res. Tech. 77:120–132, 2014. © 2013 Wiley Periodicals, Inc.     

Evaluation of Measurement Uncertainty for Absolute Flatness Measurement by Using Fizeau Interferometer with Phase-Shifting Capability

It is important to precisely measure flatness of the optical flats, as many industries use these as reference standards to ensure the quality of precision measurements and fabricated components. This paper describes identification of sources of error and measurement uncertainty evaluation for three flat test. Three flat test is used for absolute flatness measurement of optical flats, with the help of Fizeau interferometer (VerifireXP/D, with phase shift interferometry) established recently at National Physical Laboratory, India (NPL-I). The absolute profile of reference flat with higher accuracy can be determined using liquid level reference but liquid flat reference is more difficult to realize practically. Therefore three flat test is frequently adopted in standard interferometric measurements and traceability of this test can also be established by using a traceable laser head. This paper describes three flat method in detail along with observations and evaluation of measurement uncertainty as per ISO GUM is also done. Factors contributing to uncertainty of measurement of surface flatness have been indentified and detailed evaluation of uncertainty in measurements has been reported here.     

Propositional semantics for disjunctive logic programs

In this paper we study the properties of the class of head-cycle-free extended disjunctive logic programs (HEDLPs), which includes, as a special case, all nondisjunctive extended logic programs. We show that any propositional HEDLP can be mapped in polynomial time into a propositional theory such that each model of the latter corresponds to an answer set, as defined by stable model semantics, of the former. Using this mapping, we show that many queries over HEDLPs can be determined by solving propositional satisfiability problems. Our mapping has several important implications: It establishes the NP-completeness of this class of disjunctive logic programs; it allows existing algorithms and tractable subsets for the satisfiability problem to be used in logic programming; it facilitates evaluation of the expressive power of disjunctive logic programs; and it leads to the discovery of useful similarities between stable model semantics and Clark's predicate completion.     

Memory intensive AND/OR search for combinatorial optimization in graphical models

In this paper we explore the impact of caching during search in the context of the recent framework of AND/OR search in graphical models. Specifically, we extend the depth-first AND/OR Branch-and-Bound tree search algorithm to explore an AND/OR search graph by equipping it with an adaptive caching scheme similar to good and no-good recording. Furthermore, we present best-first search algorithms for traversing the same underlying AND/OR search graph and compare both algorithms empirically. We focus on two common optimization problems in graphical models: finding the Most Probable Explanation (MPE) in belief networks and solving Weighted CSPs (WCSP). In an extensive empirical evaluation we demonstrate conclusively the superiority of the memory intensive AND/OR search algorithms on a variety of benchmarks.     

A shared reality of therapists and survivors in a national crisis as illustrated by the Gulf War.

Utilizes the example of the Gulf War to present a conceptualization and a pragmatic model of professional intervention during situations of national crisis, like the recent situations (bomb explosions) in Buenos Aires, Argentina and in Oklahoma City, US. The authors discuss the impact of the shared reality experienced by therapists and patients, when both are exposed to a national crisis. The article stresses the importance of going out into the field and aiding the victims wherever they are. It describes interventions by an Israeli mental health team formed during the Gulf War, which assisted victims, whose homes were damaged by Scud missiles, wherever they were housed after their evacuation. By addressing the questions that confront the therapist in a national crisis of this kind, the authors introduced a certain mode of work that reflects the way the therapist and the patient cope with their shared reality as well as with the interrelationship between external organization and internal mobilization. Three case examples of adult individuals whose homes were destroyed during the war serve to illustrate the effectiveness of the technique of immediate intervention in the field in a crisis of this kind. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of polymer architecture on metal nanoclusters

Synthesis of metal nanoclusters in polymeric media has been shown to yield small clusters with a narrow size distribution. Embedding such clusters in the three-dimensional structures formed by diblock copolymers will allow the development of ordered structures with high optical and magnetic contrast between the different regions. In this paper we investigate the effect of homopolymer and diblock copolymer properties on the cluster size. We find that in homopolymer solutions, the cluster size reaches a minimum at a specific chain molecular weight (MW). In the case of diblock copolymers, the cluster size is set by the MW of the block with the stronger affinity to the metal surface.