bluuebunny/crossref_metadata_2025_split huggingface dataset:
Adaptive spectrum scanning techniques for reducing the identification time of the frequency coded chipless RFID system
Authors: El‐Awamry Ahmed , Khaliel Maher , Fawky Abdelfattah , Kaiser Thomas 
Published: March 2017

AbstractThe main objective of this contribution is to introduce novel techniques for reducing the time taken from the reader to identify the frequency coded chipless radio frequency identification tags existed in the reader's interrogation region, system latency. The frequency scanning methodology, number of averaging for clutter removal, and hop duration are the 3 main parameters that significantly affect the overall system latency. Consequently, the adaptive frequency hopping (AFH) and adaptive sliding window (ASW) methodologies are proposed and proofed to be efficient for the chipless radio frequency identification systems from the latency and accuracy perspectives. Likewise, the performance of the designed AFH and ASW techniques are compared with the classical fixed frequency hopping methodology with a fine frequency step to validate the accuracy of the proposed methods. Moreover, 4 different coded frequency coded chipless tags are manufactured and used in the measurements. A real‐world testbed is designed including a software‐defined radio platform by which the proposed adaptive algorithms and traditional fixed frequency hopping methodology are implemented. All the measurements are performed in an indoor realized scenario, including the environmental effects. The experiments show that the proposed AFH combined with ASW algorithms significantly reduce the system latency by 58%.
Long‐term liver‐specific functions of hepatocytes in electrospun chitosan nanofiber scaffolds coated with fibronectin
Authors: Rajendran Divya , Hussain Ali , Yip Derek , Parekh Amit , Shrirao Anil , Cho Cheul H. 
Published: March 2017

AbstractIn this study, a new 3D liver model was developed using biomimetic nanofiber scaffolds and co‐culture system consisting of hepatocytes and fibroblasts for the maintenance of long‐term liver functions. The chitosan nanofiber scaffolds were fabricated by the electrospinning technique. To enhance cellular adhesion and spreading, the surfaces of the chitosan scaffolds were coated with fibronectin (FN) by adsorption and evaluated for various cell types. Cellular phenotype, protein expression, and liver‐specific functions were extensively characterized by immunofluorescent and histochemical stainings, albumin enzyme‐linked immunosorbent assay and Cytochrome p450 detoxification assays, and scanning electron microscopy. The electrospun chitosan scaffolds exhibited a highly porous and randomly oriented nanofibrous structure. The FN coating on the surface of the chitosan nanofibers significantly enhanced cell attachment and spreading, as expected, as surface modification with this cell adhesion molecule on the chitosan surface is important for focal adhesion formation and integrin binding. Comparison of hepatocyte mono‐cultures and co‐cultures in 3D culture systems indicated that the hepatocytes in co‐cultures formed colonies and maintained their morphologies and functions for prolonged periods of time. The 3D liver tissue model developed in this study will provide useful tools toward the development of engineered liver tissues for drug screening and tissue engineering applications. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2119–2128, 2017.
Differential responses of grain yield, grain protein, and their associated traits to nitrogen supply in soft red winter wheat
Authors: Tamang Bishal G. , Brasier Kyle G. , Thomason Wade E. , Griffey Carl A. , Fukao Takeshi 
Published: March 2017

AbstractIncreased application of nitrogen fertilizers has significantly raised grain yield and protein concentration in wheat. However, only 30–50% of applied fertilizer nitrogen are usually utilized by the plant. In this study, four soft red winter wheat genotypes (Triticum aestivum L., IL07‐4415, MD05W10208‐11‐8, OH06‐150‐57 and Sisson) were grown under three different nitrogen regimes (high, medium, and low) in a greenhouse, and grain yield, grain protein concentration, nitrogen use efficiency (NUE) and their associated traits were evaluated. Among the four genotypes, a high‐yielding cultivar, Sisson, exhibited superior performance in terms of grain weight plant−1 and NUE for yield (NUEY) at low nitrogen due to maintained grain number spike−1 and harvest index. Significant yield losses due to nitrogen limitation were attributable to reduced spike number plant−1 and grain number spike−1 in the other genotypes. Interestingly, a linear relationship between NUEY and NUE for grain protein (NUEP) was detected at high (R2 = 0.67) and low (R2 = 0.42) nitrogen; both of these traits were positively correlated with grain number spike−1, 1000‐seed weight, and harvest index under nitrogen‐limited conditions (R2 = 0.35–0.48). These results suggest that simultaneous improvement of NUEY and NUEP could be achieved through the selection of the three yield components (grain number spike−1, 1000‐seed weight, and harvest index) at low nitrogen.
The effect solid particle lubricant contamination on the dynamic behavior of compliant journal bearings
Authors: Boucherit Hamid , Bou‐Saïd Benyebka , Lahmar Mustapha 
Published: March 2017

AbstractThe proposed work concerns a theoretical and numerical investigation of the effect of solid particle contamination of lubricant oils on the static and dynamic characteristics of a finite length compliant journal bearing operating under isothermal conditions with laminar flow.In the present investigation, we use simple models based on the Einstein's mixture theory, which is characterized by the presence of suspended rigid particles in a fluid. Using the classical assumptions of lubrication, a Reynolds equation is derived and solved numerically by the finite difference method. The displacement field at the fluid film bearing liner interface due to pressure forces is determined using the elastic thin layer model.The results obtained show that the presence of suspended rigid particles in the lubricating oil (solid contamination) has significant effects on the hydrodynamic performance characteristics such as the pressure field, friction force, flow rate, elastic surface deformation as well as stability maps of the rotor‐bearing system (critical mass and whirl frequency) especially at high volumetric concentration.
SIW‐fed Vivaldi antenna with beam steering capabilities
Authors: Puskely Jan , Mikulasek Tomas , Lacik Jaroslav , Raida Zbynek , Arthaber Holger 
Published: March 2017

ABSTRACTA tapered slot antenna element capable of reconfiguring its beam direction is presented. As the basic element, a Vivaldi antenna fed by a substrate integrated waveguide is chosen. The Vivaldi antenna is complemented by a parasitic planar array of small metallic patches placed in front of its aperture and by corrugated edges of the Vivaldi antenna's arms to provide reconfiguration capabilities. The proposed antenna's beam can be steered in five directions by configuring the interconnections of the parasitic patches and by activation/deactivation of the corrugated edges in the antenna arms. The antenna steers the radiation beam over ±30° in E plane and operates in the frequency band of 6.0–6.5 GHz. The measured gain at 6.25 GHz for 0°, ±15°, and ±30° beam direction of the antenna with ideal switches, is 8.4 dBi, 7.5 dBi, and 6.7 dBi, respectively. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1022–1027, 2017
Low‐profile circularly polarized cylindrical dielectric resonator antenna coupled by L‐shaped resonating slot
Authors: Mishra Nipun K. , Das Soma , Vishwakarma Dinesh K. 
Published: March 2017

ABSTRACTThe aim of this work is to design a low‐profile Circularly Polarized Dielectric Resonator Antenna for the X‐band frequency applications. With optimized design the proposed Cylindrical DRA (CDRA) fed by off‐centered L shaped slot is showing characteristics of Circular Polarization in the proposed band. Two orthogonal arms of off‐centered L shaped slot having different dimension excite the two TM01δ modes at 9.5 and 10.5 GHz, in addition both slots itself produce resonances nearly at 8.6 GHz. Combination of all these resonances is generating the nature of circular polarization near 9.5 GHz. Parametric study on designed antenna has been done in order to determine the effect of design parameters on the circular polarization. Axial Ratio bandwidth of 10.5% (1 GHz) and impedance bandwidth of 25% (2.3 GHz) at 9.5 GHz has been shown for single and simple feed low‐profile CDRA. Prototype of optimized design has been fabricated for the validation and measured results have shown good agreement with simulated ones. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:996–1000, 2017
A five elements sequential rotation array arranged in a single‐layer pentagonal substrate
Authors: Maddio Stefano , Pelosi Giuseppe , Righini Monica , Selleri Stefano 
Published: March 2017

ABSTRACTA pentagonal circular polarized subarray composed of five elements is proposed for operation at 2.45 GHz. The array is based on the sequential rotation architecture (SRA), implemented with a sequential phase distribution network. Despite a more complex design in comparison to the canonical 4‐elements SRA, a pentagonal subarray is more suited to be packed in a Bucky‐ball or icosahedral arrangement, ideal for smart antennas with wide angle spatial coverage. A single‐layer via‐less prototype is fabricated on a common FR4 substrate. Measurements show a realized gain of 6.15 dBi with a polarization purity exceeding 20 dB at 2.45 GHz. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1077–1081, 2017
Dual notched, high gain diversity antenna for wide band applications
Authors: Satam Vandana , Nema Shikha 
Published: March 2017

ABSTRACTA compact microstrip line fed wide band MIMO antenna with high isolation, dual notch bands with high gain and low correlation coefficient is proposed in this article. These characteristics makes antenna superior for diversity applications. U‐shape slots are etched on radiating element and on feed line to achieve decent band rejection capability. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:1222–1226, 2017
Investigating the Coordination/Binding Events of Biologically Relevant Monosaccharides with New Mononuclear Iron(III) and Zinc(II) Complexes in Aqueous Solution
Authors: Giri Gopal C. , Haldar Shobhraj , Vijaykumar Gonela , Bera Manindranath 
Published: March 2017

AbstractNew water‐soluble mononuclear iron(III) and zinc(II) complexes, (Me4N)4[Fe2OCl6][Fe(pbal)Cl3]2 (1), (Me4N)[Fe(pbal)(NO3)3] (2) and (Me4N)[Zn(pbal)Cl2] (3)(Hpbal=N‐(2‐pyridylmethyl)‐β‐alanine) have been synthesized and fully characterized. The interactions of the complexes with biologically relevant monosaccharides, such as D‐glucose, D‐xylose and D‐mannose have been studied by UV‐Vis, 13C NMR and ESI‐MS techniques in alkaline aqueous solution. All the monosaccharides bind to metal complexes in 1:1 molar ratio. Binding‐induced gradual increase in the absorption intensities of 1 and 2 has been observed in the UV‐Vis spectra, with a significant blue shift of absorption maxima of the complexes upon increasing the concentration of monosaccharides. The binding ability and binding mode of these monosaccharides with 3 are identified by their characteristic coordination‐induced shift (CIS) values for carbon atoms C1 and C2 in the 13C NMR spectra. The ESI‐MS for the complexes under the same experimental conditions but in the presence of one mol equiv. of the applied monosaccharides indicate the formation of complex/monosaccharide‐bound associations in solution.
Natural Template Mediated Sustainable Synthesis of Nanocrystalline Zeolite with Significantly Improved Catalytic Activity
Authors: Rani Poonam , Satpati Biswarup , Srivastava Rajendra 
Published: March 2017

AbstractA novel, natural template mediated, one‐step, direct synthesis route was developed for the preparation of nanocrystalline zeolites. Bio‐template (pollen grains and yeast) was used along with a microporous zeolite structure director to obtain nanocrystalline ZSM‐5. Nanocrystalline ZSM‐5 exhibited large surface area, pore volume and intercrystalline mesopores when compared to the conventional ZSM‐5. Bio‐template (containing different functional groups) cooperatively participated in the zeolite crystallization process with the assistance of microporous zeolite structure director to form nanocrystalline ZSM‐5 framework, while the cell walls of the bio‐templates exerted an influence on restraining the growth of zeolite nanoparticles. Bio‐template mediated synthesis strategy of the present investigation was extended for the preparation of other related materials such as silicalite, zirconosilicate, and titanosilicate. Nanocrystalline ZSM‐5 and metallosilicates exhibited excellent catalytic activities involving large organic molecules, which are important for the synthesis of a wide range of industrially important fine chemicals.
A review of multivariate distributions for count data derived from the Poisson distribution
Authors: Inouye David I. , Yang Eunho , Allen Genevera I. , Ravikumar Pradeep 
Published: March 2017

The Poisson distribution has been widely studied and used for modeling univariate count‐valued data. However, multivariate generalizations of the Poisson distribution that permit dependencies have been far less popular. Yet, real‐world, high‐dimensional, count‐valued data found in word counts, genomics, and crime statistics, for example, exhibit rich dependencies and motivate the need for multivariate distributions that can appropriately model this data. We review multivariate distributions derived from the univariate Poisson, categorizing these models into three main classes: (1) where the marginal distributions are Poisson, (2) where the joint distribution is a mixture of independent multivariate Poisson distributions, and (3) where the node‐conditional distributions are derived from the Poisson. We discuss the development of multiple instances of these classes and compare the models in terms of interpretability and theory. Then, we empirically compare multiple models from each class on three real‐world datasets that have varying data characteristics from different domains, namely traffic accident data, biological next generation sequencing data, and text data. These empirical experiments develop intuition about the comparative advantages and disadvantages of each class of multivariate distribution that was derived from the Poisson. Finally, we suggest new research directions as explored in the subsequent Discussion section.WIREs Comput Stat2017, 9:e1398. doi: 10.1002/wics.1398This article is categorized under:Statistical and Graphical Methods of Data Analysis > Multivariate Analysis
Effects of UPR and ERAD pathway on the prolyl endopeptidase production in Pichia pastoris by controlling of nitrogen source
Authors: Wang Xiao-Dong , Jiang Ting , Yu Xiao-Wei , Xu Yan 
Published: March 2017

Abstract
Prolyl endopeptidase (PEP) is very useful in various industries, while the high cost of enzyme production remains a major obstacle for its industrial applications. Pichia pastoris has been used for the PEP production; however, the fermentation process has not be investigated and little is known about the impact of excessive PEP production on the host cell physiology. Here, we optimized the nitrogen source to improve the PEP expression level and further evaluated the cellular response including UPR and ERAD. During methanol induction phase the PEP activity (1583 U/L) was increased by 1.48-fold under the optimized nitrogen concentration of NH4+ (300 mmol/L) and casamino acids [1.0% (w/v)] in a 3-L bioreactor. Evaluated by RT-PCR the UPR and ERAD pathways were confirmed to be activated. Furthermore, a strong decrease of ERAD-related gene transcription was observed with the addition of nitrogen source, which contributed to a higher PEP expression level.
A New Strategy for Quantitative Proportions in Complex Systems of Blended Oils by Triacyglycerols and Chemometrics Tools
Authors: Yang Hong , Tong Pei‐Jin , Jiang Yuan‐Rong , Cao Wen‐Ming , Wang Xi‐Chang , Wei Ting‐Ting , Li Tong , Zhong Cheng , Zhang Yi‐Ming , Zhou Chuan , Ding Zhuo‐Ping , Zhang Yu‐Quan 
Published: March 2017

AbstractMany oils sold in China and India are a blend of various oils to improve performance, stability, and nutritional characteristics, which are required in their respective markets. Quantitative analysis of the proportions of constitutive components is fundamental to the conformity and adulteration checking of edible blended oil products. A multi linear regression model with constrained linear least squares and exhaustion calculation was applied in this study. The source of the varieties in the model is a database (614 pure oils) of triacylglycerols (TAGs) collected by GC–FID and HPLC–RID. There were 20 groups of binary and ternary blended oils consisting of two or three oils out of five kinds, namely soybean, corn, peanut, rapeseed, and sunflower, which were analyzed and processed separately. Results showed that the method was able to predict the proportions of constitutive components in the edible blended oils, given that relative errors required less than 20%, the accuracy was 98.2% for the binary system if the proportion of each oil in blended oils was more than 20%, while the accuracy was 84.7% for the ternary system if the proportion of each oil in blended oils was more than 10%. The quantitative method is based on a simple analysis to determine the TAGs composition and thus it is useful for quick segregation and quality control of blended oils in routine analysis.
Seneca on Surpassing God
Authors: AIKIN SCOTT 
Published: March 2017

ABSTRACT:Seneca twice argues that the wise person (sapiens) outstrips or surpasses (antecedat) God. On its face, this claim seems both starkly impossible and rankly impious, the kind of thought antithetical to Stoic wisdom. However, a case may be made that the thought is a natural outgrowth of Stoicism's value theory and is part of the broader Stoic aspirational ethical program.
‘All the corridors are the same’: a qualitative study of the orientation experiences and design preferences of UK older adults living in a communal retirement development
Authors: O'MALLEY MARY , INNES ANTHEA , MUIR SARAH , WIENER JAN M. 
Published: March 2017

ABSTRACTEnvironments need to be designed such that they support successful orientation for older adults and those with dementia who often experience marked difficulties in their orientation abilities. To better understand how environments can compensate for decreasing orientation skills, voice should be given directly to those experiencing dementia to describe how they find their way and to understand their design preferences. This study explored the navigational experiences and design preferences of older adults with memory difficulties living in a retirement development. In-depth semi-structured interviews with 13 older adults experiencing memory difficulties were conducted. All participants were residents of one retirement development in the United Kingdom. Questions began broadly, for example, to describe their experiences of navigating in their living environment, before discussing any specific navigation difficulties in detail. Thematic analysis identified three main themes: highlighting environmental design that causes disorientation, strategies to overcome disorientation, and residents’ suggestions to improve the design. The design suggestions were particularly informative, heavily focusing on the importance of having memorable and meaningful spaces which were favoured more than signage as an orientation aid. The findings demonstrate the need to consider environmental design to support orientation for those with memory difficulties. Of particular importance is the use of meaningful and relevant landmarks as orientation aids which can additionally stimulate conversation and increase wellbeing. Given the range of suggestions in dementia-friendly design guidelines aimed to support orientation, it is crucial to speak directly to those living in different environments to learn how they find their way around and what design works in their environment.
The policies, practices and predicaments of senior employment in Hong Kong and Singapore
Authors: HIGGINS PAUL , VYAS LINA 
Published: March 2017

ABSTRACTThe ageing of populations is an unprecedented worldwide phenomenon that has created anxiety about labour and skill shortages in many developed countries. One way to address these concerns is to extend the working lives of seniors through appropriate retirement, retention and recruitment policies. This paper utilises official policy documentation and employment data to compare the policies, practices and predicaments of senior employment in Hong Kong and Singapore, two of developed Asia's most ageing economies. It finds that while labour force participation rates among Hong Kong seniors have declined since the early 1990s, older workers in Singapore remain largely confined to the secondary labour market. This paper examines why these trends are occurring and whether longer working lives will lead to greater opportunities for ‘active ageing’ in employment or, conversely, force older workers into a reserve army of labour to maintain their incomes.
A redox-mediated Kemp eliminase
Authors: Li Aitao , Wang Binju , Ilie Adriana , Dubey Kshatresh D. , Bange Gert , Korendovych Ivan V. , Shaik Sason , Reetz Manfred T. 
Published: March 2017

AbstractThe acid/base-catalysed Kemp elimination of 5-nitro-benzisoxazole forming 2-cyano-4-nitrophenol has long served as a design platform of enzymes with non-natural reactions, providing new mechanistic insights in protein science. Here we describe an alternative concept based on redox catalysis by P450-BM3, leading to the same Kemp product via a fundamentally different mechanism. QM/MM computations show that it involves coordination of the substrate’s N-atom to haem-Fe(II) with electron transfer and concomitant N–O heterolysis liberating an intermediate having a nitrogen radical moiety Fe(III)–N· and a phenoxyl anion. Product formation occurs by bond rotation and H-transfer. Two rationally chosen point mutations cause a notable increase in activity. The results shed light on the prevailing mechanistic uncertainties in human P450-catalysed metabolism of the immunomodulatory drug leflunomide, which likewise undergoes redox-mediated Kemp elimination by P450-BM3. Other isoxazole-based pharmaceuticals are probably also metabolized by a redox mechanism. Our work provides a basis for designing future artificial enzymes.
Heterogeneity in homogeneous nucleation from billion-atom molecular dynamics simulation of solidification of pure metal
Authors: Shibuta Yasushi , Sakane Shinji , Miyoshi Eisuke , Okita Shin , Takaki Tomohiro , Ohno Munekazu 
Published: March 2017

AbstractCan completely homogeneous nucleation occur? Large scale molecular dynamics simulations performed on a graphics-processing-unit rich supercomputer can shed light on this long-standing issue. Here, a billion-atom molecular dynamics simulation of homogeneous nucleation from an undercooled iron melt reveals that some satellite-like small grains surrounding previously formed large grains exist in the middle of the nucleation process, which are not distributed uniformly. At the same time, grains with a twin boundary are formed by heterogeneous nucleation from the surface of the previously formed grains. The local heterogeneity in the distribution of grains is caused by the local accumulation of the icosahedral structure in the undercooled melt near the previously formed grains. This insight is mainly attributable to the multi-graphics processing unit parallel computation combined with the rapid progress in high-performance computational environments.