凤凰城图书馆西萨·查维兹分馆

项目背景地处美国西南部的凤凰城(Phoenix)是全美第六大城市,拥有一个庞大的公共图书馆体系。图书馆部在20世纪80年代决定以后的图书馆发展要强     

A powerful approach to develop nitrogen-doped graphene sheets: theoretical and experimental framework

Journal of Materials Science - We have reported a novel route to develop highly conductive graphene sheets using camphor as a natural precursor followed by nitrogen doping via low-temperature...     

Fitness based weighted flower pollination algorithm with mutation strategies for image enhancement

Multimedia Tools and Applications - Flower Pollination Algorithm (FPA) is a well-known swarm intelligence optimization algorithm, which has shown an effective performance by solving many...     

Effects of acid,alkaline, and seawater aging on the mechanical and thermomechanical properties of glass fiber/epoxy composites filled with carbon nanofibers

Owing to the superior corrosion resistance, fiber-reinforced polymer (FRP) composites are the prime choice of structural materials for various marine and chemical industries, where there is a long-term direct contact of the components takes place with corrosive fluids. In this present work, glass fiber/epoxy (GE) composites have been fabricated with and without carbon nanofibers (CNFs), and aging has been carried out in acidic (pH = 1), seawater (pH = 8.2), and alkaline (pH = 13) solutions for 150 days. The resistance of CNF-filled GE composites toward the corrosive fluids has been evaluated in terms of alteration in the mechanical (flexural), microstructural (fractography analysis by field emission scanning electron microscope), and thermomechanical (dynamic mechanical analysis) behavior of the materials. It is revealed that as the immersion time increases, there is a continuous decrement in flexural strength and modulus, and glass-transition temperature (T_g) of all the materials in all these solutions. Compared to the 1% CNF-filled GE composite, control GE composite showed more degradation in the case of alkaline aging and seawater aging. Maximum reduction (56%) in the strength of GE composite was observed due to 150 days of alkaline aging. However, the control GE composite showed better resistance to the acidic solution than that of CNF-filled GE composite. Possible failure modes, changes in the chemistry of the material due to aging have been studied by fractography analysis. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48434.     

CORDIC-Based VLSI Architecture for Implementing Kaiser-Bessel Window in Real Time Spectral Analysis

Windowing techniques have been widely used for preprocessing of samples before fast Fourier transform (FFT) in real time spectral analysis to minimize spectral leakage and picket fence effect. Among all popular window functions, Kaiser-Bessel window is an obvious choice for its better spectral characteristics. In this paper, CORDIC (CO-ordinate Rotation DIgital Computer) based VLSI architecture for implementing Kaiser-Bessel window has been proposed for real time applications. The parallel-pipelined technique has been adopted for the present design to ensure high throughput. Various architectural design and implementation issues have been discussed. The physical synthesis for ASIC implementation of proposed architecture using Synopsys design compiler(Design Vision) and commercially available 0. 18 μm CMOS yields the core area of 52 mm ²and worst case dynamic power of 890 mW at an operating frequency and voltage of 400 MHz and 1.8 V respectively.     

Accessing electronic information in UK further education: Findings from JUBILEE in FE,a JLSC‐funded research project

The further education sector has been exposed to many changes during the last decade, including the development of a National Information and Technology structure, an increasing emphasis on ‘lifelong learning’, ‘key skills’, collaboration and regional planning, changes in funding arrangements and growth in student numbers and wider participation. Growing emphasis on the use of Electronic Information Services (EIS) in teaching is forcing academic staff to acquire and expand their ICT and information literacy skills. In the course of this paper some of the main barriers and impediments faced by academic staff in the present climate are discussed as identified by the JUBILEE research. These included access to technology, staff attitudes and skill levels and the focus of available EIS. Enabling access to EIS has emerged as a pivotal aim and the research found that through the implementation of an informed EIS strategy, effective communication and awareness raising, tailored user training programmes, and embedding EIS into the curriculum, the ability of users to access and use EIS effectively is enhanced. The necessity for further education institutions to succeed in this aim is vital given that, in an increasingly digital world of information, access is the key.     

Statistical analysis of mammographic features and its classification using support vector machine

This study aims at designing a support vector machine (SVM)-based classifier for breast cancer detection with higher degree of accuracy. It introduces a best possible training scheme of the features extracted from the mammogram, by first selecting the kernel function and then choosing a suitable training-test partition. Prior to classification, detailed statistical analysis viz., test of significance, density estimation have been performed for identifying discriminating power of the features in between malignant and benign classes. A comparative study has been performed in respect to diagnostic measures viz., confusion matrix, sensitivity and specificity. Here we have considered two data sets from UCI machine learning database having nine and ten dimensional feature spaces for classification. Furthermore, the overall classification accuracy obtained by using the proposed classification strategy is 99.385% for dataset-I and 93.726% for dataset-II, respectively.     

31—THE EFFECT OF THE APPLICATION OF BATCHING OIL ON THE FINE STRUCTURE AND MECHANICAL PROPERTIES OF JUTE

An investigation is described in which jute filaments obtained from breaker-card sliver were subjected to the following treatments: (i) samples were made moisture-free but retained the batching oil; (ii) samples were made both moisture-free and oil-free; (iii) moisture-free and oil-free samples were soaked in water and again made moisture-free. Jute filaments were also obtained from raw fibre and from raw fibre from which natural fat and wax had been removed. The X-ray crystallinity was determined for all the samples in the moisture-free condition. The results obtained are explained on the basis of a paracrystalline structure of cellulosic fibre, some regions of which are capable of diffracting X-rays and at the same time are accessible to moisture. It has been proposed that, when the fibre is treated with an oil–water emulsion, water molecules penetrate into the amorphous regions and into portions of the region of intermediate order (paracrystalline), the resultant swelling then producing fissures that oil particles in the emulsion enter and in which they anchor themselves like wedges. These anchored oil particles are retained when the absorbed moisture (the water molecule) gradually evaporates to leave the structure in a less crystalline state. Rigidity values of the variously treated jute filaments support this view.     

Monitoring Suspended Sediment Dynamics Using MBES

This technical note describes use of a multibeam echosounder (MBES) to quantify the dynamics of suspended sediment in a large open channel. A methodology is detailed that uses the backscatter magnitude from the MBES water-column data to adjust the magnitude of sonar returns for the various sonar settings, spatially and temporally average the data to account for the random nature of acoustic backscatter from the suspended sediment, and calibrate the processed data with direct samples. A case study of flow at the confluence of the Rio Paraná and Rio Paraguay, Argentina, where there is a distinct turbidity difference along the mixing interface of the two flows, is used to demonstrate the unique capabilities of MBES to quantify sediment concentrations and dynamics within the water column.