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Simultaneous optimization of electrical interconnection configuration and cable sizing in offshore wind farms

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Journal of Modern Power Systems and Clean Energy 2018年第4期6卷 749-762页

作者： Mohsen SEDIGHI Mohammad MORADZADEH Osman KUKRER Murat FAHRIOGLU Department of Electrical and Electronic Engineering Eastern Mediterranean University (EMU) Electrical Engineering Department Sari Branch Islamic Azad University (IAU) Electrical Engineering Department Shahid Rajaee Teacher Training University Department of Electrical and Electronics Engineering Middle East Technical University-Northern Cyprus Campus

Offshore wind farm(OWF) is the largest renewable energy resource. The electrical interconnection cost of OWFs is a considerable fraction of the overall design cost of the farm. In order to minimize the investment and operational costs, this paper proposes an optimization formulation to find the optimal electrical interconnection configuration of wind turbines(WTs), and the optimal cable sizing simultaneously. This simultaneous minimization of total trenching length and cable dimensions creates a complex optimization problem that is solved by the harmony search(HS) algorithm. In this paper, two distinct methods of full and partial optimal cable sizing areconsidered to comprehensively assess the optimal interconnection layout of OWFs. Furthermore, various shipping and burying costs as well as various WTs power ratings are considered in order to investigate their impact on the optimal electrical interconnection system. The optimal electrical interconnection design obtained by the HS algorithm corresponds to a lower cost that together with the technological developments can help policy makers increase the use of offshore wind energy as a feasible unlimited renewable resource in their energy production portfolios.

关键词： Offshore wind farm(OWF) Optimal interconnection configuration Cable sizing Simultaneous optimization Harmony search(HS) algorithm

Investigation of bright and dark solitons in α,β-Fermi Pasta Ulam lattice

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Chinese Physics B 2021年第2期30卷 211-219页

作者： Nkeh Oma Nfor Serge Bruno Yamgoué Francois Marie Moukam Kakmeni Department of Physics Higher Teacher Training College BambiliThe University of BamendaP.O.Box 39Bambili-Cameroon Complex Systems and Theoretical Biology Group Laboratory of Research on Advanced Materials and Nonlinear Science(LaRAMaNS)Department of PhysicsFaculty of ScienceUniversity of BueaP.O.Box 63 Buea-Cameroon

We consider the Hamiltonian ofα,β-Fermi Pasta Ulam lattice and explore the Hamilton-Jacobi formalism to obtain the discrete equation of *** using the continuum limit approximations and incorporating some normalized parameters,the extended Korteweg-de Vries equation is obtained,with solutions that elucidate on the Fermi Pasta Ulam *** further derive the nonlinear Schrodinger amplitude equation from the extended Korteweg-de Vries equation,by exploring the reductive perturbative *** dispersion and nonlinear coefficients of this amplitude equation are functions of theαandβparameters,with theβparameter playing a crucial role in the modulational instability analysis of the ***βgreater than or equal to zero,no modulational instability is observed and only dark solitons are identified in the *** forβless than zero,bright solitons are traced in the lattice for some large values of the *** of numerical simulations of both the Korteweg-de Vries and nonlinear Schr¨odinger amplitude equations with periodic boundary conditions clearly show that the bright solitons conserve their amplitude and shape after collisions.

关键词： Fermi Pasta Ulam paradox bright dark

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Frontiers of Computer Science 2022年第3期16卷 207-209页

作者： Shuai WANG Chunyi CHEN Guijie ZHANG School of Computer Science and Technology Changchun University of Science and TechnologyChangchun 130022China teacher training Center of Colleges and Universities of Jilin Province Jilin Normal UniversitySiping 136000China School of Computer Science and Technology Jilin Normal UniversitySiping 136000China

1 Introduction and main contributions The combination of location technology and wireless communication technology has spawned a number of location-based services(LBS).Trusted location service providers(LSP)obtain a large amount of users’*** knowledge obtained from mining trajectory data can be used in many fields and may lead to privacy disclosure of *** data owner(LSP)should process the trajectory data to protect privacy before *** of trajectories is a common privacy protection method for publishing trajectories.

关键词： LBS trajectories services

A Fractional Model for the Single Stokes Pulse from the Nonlinear Optics

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Journal of Applied Mathematics and Physics 2022年第10期10卷 2856-2875页

作者： Mihai Ivan teacher training Department Geometry and Topology Seminary West University of Timi&#537 oara Timi&#537 oara Romania

In this paper we refer to equations of motion for the single Stokes pulse from the nonlinear optics, called the Stokes pulse system. A fractional-order model with Caputo derivative associated to Stokes pulse system (called the fractional Stokes pulse system) is proposed. The existence and uniqueness of solution of initial value problem for this fractional system are proved. The dynamic behavior for a special fractional Stokes pulse system is investigated, including: the fractional stability, the stabilization problem using suitable linear controls and the numerical integration based on fractional Euler method.

关键词： Fractional Stokes Pulse System Fractional Stability Fractional Euler Method Numerical Integration

ON CONJECTURE ABOUT A CODE COMMUTATIVELY EQUIVALENT TO A PREFIX CODE

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Science in China,Ser.A 1987年第10期 3-1015页

作者：章亮郭聿琦王利民 Shanghai College of Architecture and Municipal Engineering Lanzhou University Zhangye College for teacher-training Gansu Province

In this paper, we have shown that the conjecture stated by Perrin and Schutzenberger is equivalent to the fact that every simple code is commutatively equivalent to a prefix code. And this equivalence for simple codes... 详细信息

关键词： show code 刃一 ON CONJECTURE ABOUT A CODE COMMUTATIVELY EQUIVALENT TO A PREFIX CODE over

Improved germination of threatened medicinal Prunus africana for better domestication: effects of temperature, growth regulators and salts

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Journal of Forestry Research 2020年第6期31卷 2403-2411页

作者： Justine Germo Nzweundji Koffi Konan Leopold MNyochembeng Nehemie Donfagsiteli Tchinda Nicolas Niemenak Department of Biological Science Higher Teacher Training CollegeUniversity of Yaounde IPO Box 47Yaounde´Cameroon Centre for Research on Medicinal Plants and Traditional Medicine Institute of Medical Research and Medicinal Plants Studies(IMPM)PO Box 6163Yaounde´Cameroon IngateyGen LLC Elizabeth CityNCUSA Department of Natural Resources and Environmental Sciences Alabama A&M UniversityHunstvilleALUSA

Prunus africana is an endangered medicinal species and has been classified as a priority for domestication in ***,the seeds rapidly lose their viability during storage at room temperature after 2–3 *** study aimed to improve seed germination of *** by germinating at different temperatures(4℃,28℃)using different concentrations of growth stimulators(sodium nitrate and gibberellic acid)and different concentrations of *** seeds had 91.7%germination at 4C after 1 month of *** regulators considerably influenced germination after 6 months and reached 66.0%with 10 mM gibberellic acid and 100%with 10 mM sodium *** three shoots per seed were developed,an indication of *** analyses revealed the presence of protein-like bodies close to the embryo axis and accumulations of starch after 7 days of *** 14 days,amyloplasts and dark protein bodies of various sizes were *** outcome of this study will contribute to improve the germination of *** for better domestication and conservation.

关键词： Conservation Germination Growth regulators Histochemical analyses Prunus africana Temperature

A study on the form contemporary developments of Tabriz leather and shoe Bazaar(marketplace)from the late Qajar to current period

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Frontiers of Architectural Research 2024年第4期13卷 741-763页

作者： Rana Najjari Nabi Nahideh Rezaei Rahmat Mohammad Zadeh Farzin Haghparast Department of Architectural Engineering&Urban Design Shahid Rajaee Teacher Training UniversityTehranIran Faculty of Architecture and Urbanism Tabriz Islamic Art UniversityTabrizIran Department of Civil Architecture GroupUniversity of TabrizTabrizIran

Bazaars are considered essential components of a society’s economy and significant features in the urban context of cities,which have emerged based on exchanging goods and meeting people’s *** the late Qajar period,amidst the rapid changes resulting from interaction with modernization,the form of Tabriz Grand Bazaar has undergone significant *** research aims to explain the contemporary transformations of marketplace form in the leather and shoe *** objectives aim to elucidate the contemporary physical,functional,and sementic changes and propose *** research method is qualitative,with a phenomenological *** results indicate that the Bazaar has lost some physical and sementic *** providing goods,it has failed to meet the public’s demands because of eliminating production workshops by changing the productive function to service-oriented and the size and shape of *** decline of religious activities is also one reason for the diminished sementic *** functional and physical aspects,some proposed solutions include preserving the authenticity of the spaces and utilizing suitable Functions with the dominant architectural *** sementic characteristics,suggestions include enhancing the sense of identity.

关键词： Contemporary developments Form Functional_Physical_Semantic factors Marketplace Bazaar

Evolution of Floristic Composition and Structural Parameters between Two Management Inventories in a Tropical Forest in the East Cameroon Region

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Open Journal of Forestry 2023年第3期13卷 243-261页

作者： Aichetou Ngoungoure Manjeli Fridolin Choula Kadiri Serge Bobo Achille Bernard Biwole Mireille Feudjio Department of Forestry Faculty of Agronomy and agronomical Sciences University of Dschang Dschang Cameroon Department of Biology Higher Teacher Training College The University of Bamenda Bambili Cameroon Department of Forestry Higher Teacher Technical Training College The University of Douala Douala Cameroon

The realization of two management inventories in 2003 and 2020 on the same forest concession made it possible to characterize the floristic composition and to describe some structural parameters on three sites established according to the period of exploitation. Due to the change in the orientation of the lines, it was noted that respectively 82 and 85 species from the first inventory are not found in the second and inversely. A total of 311 species were identified in 2003, compared to 314 in 2020. The density varies from 111 to 140 stems/ha for all the individuals, 19 to 25 for the main species and 15 to 20 for the most exploited species. The decrease in the basal area between the two phases of 12% for all the species and 13% for the main species on the site exploited before the first inventory indicates a persistence of the disturbance for years after logging. It is proposed to supplement the management plans decisions with annual measures based on more complete inventories and to ensure the application of reduced impact logging measures.

关键词： Tropical Forest Floristic Composition Density Basal Area

Synthesis, Characterization and X-Ray Structure of a Ba(II)/Ag(I)/Cr(III)-Oxalate Salt with Water-Filled Nanochannels

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American Journal of Analytical Chemistry 2016年第1期7卷 99-106页

作者： Clémence Eboga Tanke Bridget N. Ndosiri Yves A. Mbiangué Gouet Bebga Justin Nenwa Inorganic Chemistry Department Faculty of Science University of Yaounde 1 Yaounde Cameroon Chemistry Department Higher Teacher Training College University of Maroua Maroua Cameroon Chemistry Department Higher Teacher Training College University of Yaounde 1 Yaounde Cameroon

A novel mixed barium(II)/silver(I)/chromium(III) oxalate salt, Ba0.5Ag2[Cr(C2O4)3]·5H2O (1), with open architecture has been synthesized in water and characterized by elemental analysis, vibrational and electronic spectra, and single crystal X-ray structure determination. Compound 1 crystallizes in a monoclinic space group C2/c, with unit cell parameters a = 18.179(3), b = 14.743(2), c = 12.278(2)Å, β = 113.821(3), V = 3010.34(90) Å3, Z = 8. The structure is characterized by a network of anionic [Cr(C2O4)3]3- units connected through the O atoms of the oxalates to Ba2+ and Ag+ sites, forming a three-dimensional coordination polymer with one-dimensional isolated nanochannels parallel to the c axis, and encapsulating hydrogen-bonded guest water molecules. The bulk structure is consolidated by O–H···O bridgings within the nanochannels and by coulombic interactions.

关键词： Crystal Structure Chromium(III) Complex Nanochannels Coordination Polymer Guest-Water Molecules