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                <text>Miniaturized monopole planar antennas operating in the VHF/UHF band applied for Digital Video Broadcasting and mobile communication have gained research interest due to their low-profile, compact, and wideband nature. This antenna is capable of penetrating surfaces more easily, faster and can broadcast larger data because it operates in the wideband. The challenge of designing an antenna small enough to be adopted for Digital Video Broadcasting in handheld devices with capabilities of covering the DVB wideband and at the same time omnidirectional, with enough gain, good impedance coefficient which translates into efficiency is the drive of this paper. The proposed antenna in this paper is a rectangular patch with two large slots created in its radiating surface and extension on its edges for wider bandwidth and better matching. It employs a modified ground plane that uses coupling to achieve low …</text>
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                <text>This study presents an omnidirectional dipole antenna with wideband and low gain variation in the horizontal plane. The antenna is made up of two driven dipoles and two parasitic dipoles placed symmetrically on both sides of a central ground plane. The driven dipole is made up of two planar arms printed on both sides of the substrate. Two small slits on both sides of the driven dipole, a large centrally placed slit in the driven dipole, extensions on both sides of the driven dipole with different dimensions, and parasitic dipoles are introduced to greatly enhance the bandwidth and also attain a low gain variation. The fabricated antenna achieves a wide impedance bandwidth of 105.5% (1.36–4.4 GHz) for S11 ≤ −10 dB, and an average gain of 4.14 dBi with a low gain variation of 2 dB. The antenna may find applications in 2G/3G/LTE frequency bands.</text>
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                <text>Boqiang Lin, Isaac Ankrah</text>
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                <text>Considering the objectives of Nigeria's Renewable Energy Program, three basic questions are asked in this study: Can Nigeria really build its economy on renewable energy? Is it possible to substitute nonrenewable energy for renewable energy? What is the impact of renewable energy on the economy? This study primarily analyzes renewable energy development in Nigeria. Among other things, we estimate the economic impact, output elasticity, and the substitution possibilities of both renewable and nonrenewable energies. Our findings, based on a dataset from 1980 to 2015, in the framework of the translog production function, show that capital and labor are the main drivers of output in Nigeria; however, the economic impact of both energy types (renewable and nonrenewable) are insignificant, even though positive. With output and substitution elasticities being positive, this study confirms the possibility of …</text>
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                <text>On the Gradient-Hamiltonian Systems to the Derivation of Economic Multivariate Total Functions</text>
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                <text>This paper highlights an application of Gradient or Hamiltonian (Grad-Ham) Systems in deriving multivariate total functions. The objective is to establish a relationship between Gradient or Hamiltonian systems and economic-oriented multivariate marginal functions, and demonstrate how they can significantly be applied to the derivation of economic multivariate total functions. The multivariate marginal functions are represented by the Grad-Ham systems of differential equations whose analytical solutions are based on the partial antiderivative technique. The paper establishes that all economic multivariate marginal functions can respectively be expressed as exact differential equations. It also uncovered that functions that can be optimized are conservative along their optimal paths and that these functions become the first integrals of their respective marginal systems. Finally, it introduces two model examples-one hypothetical and the other based on the Cobb-Douglas Production function-and presents their derivations thereof.</text>
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