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A hybrid machine-learning model for solar irradiance forecasting

Clean energy 2024年第1期8卷 100-110页

作者： Ameera M.Almarzooqi Maher Maalouf Tarek H.M.el-Fouly vasile.os e.katzourakis Mohamed S.el Moursi Constantinos V.Chrysikopoulos Department of Industrial and Systems engineering Khalifa UniversityAbu DhabiPO Box 127788UAE electrical engineering and Computer Science Department Khalifa University Abu DhabiUAE Department of Civil Infrastructure and environmental engineering Khalifa UniversityAbu DhabiPO Box 127788UAE School of Chemical and environmental engineering Technical University of CreteChaniaGreece

Nowcasting and forecasting solar irradiance are vital for the optimal prediction of grid-connected solar photovoltaic(PV)power *** plants face operational challenges and scheduling dispatch difficulties due to the fluctuating nature of their power *** the generation capacity within the electric grid increases,accurately predicting this output becomes increasingly essential,especially given the random and non-linear characteristics of solar irradiance under variable weather *** study presents a novel prediction method for solar irradiance,which is directly in correlation with PV power output,targeting both short-term and medium-term forecast *** proposed hybrid framework employs a fast trainable statistical learning technique based on the truncated-regularized kernel ridge regression *** proposed method excels in forecasting solar irradiance,especially during highly intermittent weather periods.A key strength of our model is the incorporation of multiple historical weather parameters as inputs to generate accurate predictions of future solar irradiance values in its scalable *** evaluated the performance of our model using data sets from both cloudy and sunny days in Seattle and Medford,USA and compared it against three forecasting models:persistence,modified 24-hour persistence and least *** on three widely accepted statistical performance metrics(root mean squared error,mean absolute error and coefficient of determination),our hybrid model demonstrated superior predictive accuracy in varying weather conditions and forecast horizons.

关键词： solar power generation kernel ridge regression hybrid model forecasting

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Helium Plasma effects on Polymer Surfaces:from Plasma Parameters and Surface Properties towards Bioengineering Applications

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Chinese Journal of Polymer Science 2024年第8期42卷 1156-1166页

作者： Andrei vasile Nastuta Maria Butnaru Byron Cheatham Ramona Huzum vasile Tiron Ionut Topala Physics and Biophysics education Research Laboratory(P&B-eduResLab) Biomedical Science DepartmentFaculty of Medical Bioengineering‘Grigore T.Popa’University of Medicine and Pharmacy IasiM.Kogalniceanu 9-13Iasi 700454Romania Faculty of Medical Bioengineering ‘Grigore T.Popa’University of Medicine and Pharmacy IasiM.Kogalniceanu 9-13Iasi 700454Romania Cytoviva Inc.570 Devall Drive Suite 301Auburn 36832ALUSA Integrated Center of environmental Science Studies in the North-eastern Development Region(CeRNeSIM) Department of Exact and Natural SciencesInstitute of Interdisciplinary Research‘Alexandru Ioan Cuza’University of IasiBlvd.Carol I no.11Iasi 700506Romania Research Center on Advanced Materials and Technologies(RAMTeCH) Department of Exact and Natural SciencesInstitute of Interdisciplinary Research‘Alexandru Ioan Cuza’University of IasiBlvd.Carol I no.11Iasi 700506Romania Iasi Plasma Advanced Research Center(IPARC) Faculty of Physics‘Alexandru Ioan Cuza’University of IasiBlvd.Carol I no.11Iasi 700506Romania

Plasma treatment is necessary to optimize the performance of biomaterial *** enhances and regulates the performance of biomaterial su rfaces,creating an effective interface with the human *** treatments have the ability to modify the chemical com position and physical structu re of a surface while leaving its properties *** possess the ability to modify material su rfaces,eliminate contaminants,conduct investigations on cancer therapy,and facilitate wound *** subject of study in question involves the integration of plasma science and technology with biology and *** a helium plasma jet source,applying up to 18 kV,with an average power of 10 W,polymer foils were treated for 60 *** treatment has the ability to alter the chemical composition and physical structure of a su rface while maintaining its *** investigation involved the application of helium plasma at atmospheric pressure to polyamide 6 and polyethylene terephthalate *** inquiry involves monitoring and assessing the plasma source and polymer materials,as well as analyzing the impacts of plasma *** the mean power of the discharge aids in assessing the economic efficacy of the plasma *** discharge in helium at atmospheric pressure has beneficial effects in technology,where it increases the surface free energy of polymer *** biomedicine,it is used to investigate cytotoxicity and cell survival,particularly in direct blood exposure situations that can expedite *** the specific parameters that influence the plasma source in the desired manner for the intended application is of utmost im portance.

关键词： Atmopheric pressure plasmas Plasma-polymer interaction Plasma Medicine Plasma diagnosis Polymer characterization

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Gauge Model Based on Group G×SU（2）

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Chinese Physics Letters 2008年第2期25卷 433-435页

作者： ZeT Gheorghe MANTA vasile POPA Camelia Department of Physics Gh. Asachi Technical University Iasi Romania Department of Computers Gh. Asachi Technical University Iasi Romania Faculty of Physics Al. I. Cuza University Iasi Romania

We present a model of gauge theory based on the symmetry group G×SU（2） where G is the gravitational gauge group and SU（2） is the internal group of symmetry. We employ the spacetime of four-dimensional Minkowski, endowed with spherical coordinates, and describe the gauge fields by gauge potentials. The corresponding strength field tensors are calculated and the field equations are written. A solution of these equations is obtained for the case that the gauge potentials have a particular form potentials induces a metric of Schwarzschild type on with spherical symmetry. The solution for the gravitational the gravitational gauge group space.

关键词： pulsars x-ray spectra relativity and gravitation redshift

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Integration and scaling of UV-B radiation effects on plants: the relative sensitivity of growth forms and interspecies interactions

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Journal of Plant ecology 2018年第4期11卷 656-670页

作者： vasile Alexandru Suchar Ronald Robberecht Department of Statistical Science College of ScienceUniversity of Idaho875 Perimeter Drive MS1104MoscowID 83844-1104USA Department of Forest Rangelandand Fire SciencesCollege of Natural ResourcesUniversity of Idaho875 Perimeter Drive MS1133MoscowID 83844-1133USA

Aims the relative plant type sensitivity and selected community interac-tions under increased UV-B radiation where ***,we investigated:(i)if there are differences among growth forms in regard to their sensitivity to UV-B radiation,(ii)if increased UV-B radiation influences the plant competitive balance in plant com-munities and(iii)the response mechanisms of the UV-B radiation-sensitive species that might increase their *** to answer our research questions,we used a mechanistic model that,for the first time,integrated the effects of increased UV-B radia-tion from molecular level processes,whole plant growth and devel-opment,and community *** Findings In the model simulations,species types exhibited different levels of sensitivity to increased UV-B *** C3 and C4 annuals showed similar growth inhibition rates,while biennials and winter C3 annuals were the most *** exhibited inhibitions in growth only if increased UV-B radiation results in increases in metabolic *** communities,species sensitive to UV-B radiation may have a competitive disadvantage compared to resistant plant ***,sensitive species may have a wide array of responses that can increase their fitness and reproductive success in the com-munity,such as,increased secondary metabolites production,changes in timing of emergence and reproduction,and changes in seed *** individual plants may exhibit significant inhibi-tions in growth and development,in communities,these inhibitions can be mitigated by small morphological and physiological *** or occasional increased UV-B radiation events should not have any lasting effect on the structure of the commu-nity,unless other environmental factors are perturbing the dynamic equilibrium.

关键词： UV-B radiation effects plant growth and development simulation modeling relative sensitivity competition

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In-situ nonvolatile and volatile modulation for optical neural networks

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Advanced Photonics 2023年第5期5卷 1-2页

作者： Carlos A.Ríos Ocampo University of Maryland Department of Materials Science&EngineeringCollege ParkMarylandUnited States University of Maryland Institute for Research in Electronics and Applied PhysicsCollege ParkMarylandUnited States

High-performance integrated optical memristors are crucial in developing optical neural networks based on in-memory *** devices are building blocks capable of modulating the transmission of a propagating mode in a multilevel and nonvolatile fashion,thus allowing storage and multiplication of analog signals in the same device.1 Chalcogenide phase change materials(PCMs)are candidates for high-performance devices.

关键词： optical networks neural

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eFFICIeNT HeATING AND COOLING SYSTeMS FOR LOW-eNeRGY HOUSeS

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Journal of Green Building 2012年第4期7卷 16-35页

作者： vasile Minea Hydro-Québec Research Institute Laboratoire des technologies de l’énergie(LTE)ShawiniganCanada

Buildings account for a large amount of land use, energy and water consumption, and atmospheric pollution. For example, in the United States, they use 40% of the total national energy consumption (56% by residential dwellings), produce 38% of the total carbon dioxide emissions, and account for 12.2% of the total quantity of water consumed (2006). In this context, buildings with considerably reduced energy consumption are a key strategy to achieving energy savings and climate protection targets in both the residential and commercial/institutional sectors [1]. This article reviews a number of heating and cooling systems-existing and/or under development- available for residential buildings and briefly outlines some research projects and initiatives, as well as technical achievements in Canada and other developed countries over the last few years.

关键词： low-energy house building integrated photovoltaic thermal system energy efficiency heat pump heat recovery

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Atrial fibrillation and gastroesophageal reflux disease:From the cardiologist perspective

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World Journal of Gastroenterology 2015年第10期21卷 3154-3156页

作者： Mariana Floria vasile Liviu Drug Gr.T.Popa University of Medicine and Pharmacy Institute of Gastroenterology and Hepatology of Sf. Spiridon University Hospital Gr. T. Popa University of Medicine and Pharmacy

We have read with interest the paper by Roman *** colleagues discussing the relationship between gastroesophageal reflux disease and atrial *** review is presenting the available evidence for the common pathogenic ***,from a cardiologist perspective,some available data were not highlighted in the review,cardiovascular involvement in gastroesophageal reflux is less ***,obesity or diabetes mellitus are substrate for left atrial remodeling that initiate and sustained atrial fibrillation *** of the pathophysiologic mechanisms in atrial fibrillation is the presence of a *** reflux could be only a trigger for this *** believe that atrial fibrillation should be considered as possible extraesophageal syndrome in the gastroesophageal reflux classification.

关键词： Atrial fibrillation Gastroesophageal reflux diseas

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Non-symmetric differentially subordinate martingales and sharp weak-type bounds for Fourier multipliers

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Science China Mathematics 2024年第8期67卷 1807-1826页

作者： Meryem Akboudj Yong Jiao Adam osękowski School of Mathematics and Statistics Hunan Key Laboratory of Analytical Mathematics and ApplicationsCentral South UniversityChangsha 410075China Faculty of Mathematics Informatics and MechanicsUniversity of WarsawWarsaw 02-097Poland

Let p>2 be a given *** this paper,we prove,with the best constant,the weak-type(p,p)inequality■for a large class of non-symmetric Fourier multipliers T_(m) obtained via modulation of jumps of certain Lévy *** particular,the estimate holds for appropriate linear combinations of second-order Riesz transforms and skew versions of the Beurling-Ahlfors operator on the complex *** proof rests on a novel probabilistic bound for Hilbert-space-valued martingales satisfying a certain non-symmetric subordination *** applications to harmonic functions and Riesz systems on euclidean domains are indicated.

关键词： weak-type bound Fourier multiplier martingale differential subordination laminate

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Growing arugula plants using aeroponic culture with an automated irrigation system

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International Journal of Agricultural and Biological engineering 2020年第3期13卷 52-56页

作者： Jhon D.Ríos Salazar John e.Candelo-Becerra Fredy e.Hoyos Velasco escuela de Física Facultad de CienciasUniversidad Nacional de ColombiaSede MedellínColombia Departamento de energía eléctrica y Automática Facultad de MinasUniversidad Nacional de ColombiaSede MedellínColombia

The paper presents an efficient form of growing arugula plants by means of automatic control of an aeroponic culture irrigation *** system considers a reprogrammable electronic circuit that uses software to generate different irrigation cycles to obtain an adequate growth of arugula *** show how different samples grown in a greenhouse had the same growth behavior as field-grown samples during the test *** was possible to obtain a more efficient and sustained five-week production to supply consumers by having a continuous cycle irrigation system,which was operated for 35 *** growth and number of leaves were maintained in a similar way for different plants *** grow similarly,but some of them showed size differences during the five weeks.

关键词： aeroponic culture arugula plants food production irrigation systems smart system

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Density and thermal expansion coefficients of liquid and austenite phase in lamellar cast iron

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China Foundry 2020年第2期17卷 127-136页

作者： Kristina Hellstrm vasile-Lucian Diaconu Attila Diószegi School of engineering J.nk.ping UniversitySweden

Volume change related defects formation mechanisms are an important detracting phenomenon in production of complex shaped cast *** different technical alloys,cast iron behaves in a complex manner due to the combined volume change of the formed *** liquid and the austenitic phase are contracting while the graphite phase is expanding during the *** complex volume change in combination with complex casting shapes causes a considerable deviation from isotropy in the solidification *** mentioned difficulties are considered the main reason why an extensive research work is condensed in the literature within this *** multitude of reported experimental set up and the various efforts to interpret the volume change phenomena in terms of density and thermal expansion coefficients makes the results difficult to compare from different *** these difficulties in mind,the present paper presents a broad experimental series and measures unidirectional linear deformation of an industrially spread lamellar cast iron alloy system(Fe-C-2Si)using the push-rod based dilatometer *** measurements are divided into two major groups with respect to the liquid iron deformation over the liquidus temperature line,and the austenite deformation below the solidus temperature *** obtained results are interpreted as thermal expansion coefficients,density variation slopes,and density data at the liquids and solidus *** obtained results are compared with literature data and with calculated values by the Thermo Calc software.

关键词： density thermal expansion coefficient dilatometer castiron Fe-C-2Si CALPHAD

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