bluuebunny/crossref_metadata_2025_split huggingface dataset:
UTILIZING MACHINE LEARNING ALGORITHMS TO IMPROVE THE ACCURACY OF SOLAR ENERGY YIELD PREDICTIONS BASED ON VARIOUS INPUT VARIABLES
Authors: Mohd Abdullah Al Mamun  , Abdullah Al Hossain Newaz  , Yasin Arafat  , Anwar Hossain  , Md Mehedi Hassan Melon  
Published: December 2024

This paper explores a framework for an ML model for solar yield estimation using random forest, gradient boosting, support vector machines, and neural networks There are various factors affecting solar energy production, some of which are weather conditions, solar intensity, temperature, among others, and characteristics of the panel. The trend for development and usage of renewable energy sources continues to gain momentum. The estimation of production rates for solar energy is crucial for the efficiency of energy generation, transmission, and supply. Hypothesis-driven and list-based models of traditional statistics are sometimes rather low in predictive validity because the relationships between these factors may be non-linear and highly interactive. The complex structure of these dependencies indicates that advanced ML algorithms are an appropriate approach to modeling the yield and increasing the utility of the resulting predictions. This work predictively analyzes historical solar generation data and climatic factors and preprocesses the data through normalization and feature engineering. The models are then adjusted and tested using a cross-validation approach in order to minimize the risk of obtaining high accuracy values only on the training data set. Evaluations of performance with mean absolute error, root mean square error, and coefficient of determination are used to measure the efficiency of each model. Machine learning algorithms widely outperform other models when applied to predict the yield of solar energy in the same or related areas. The random forests seem to perform better for prediction because they operate in an ensemble, which allows for modeling interactions between them. Through enhanced prediction precision, the approach proves to be a helpful resource for solar energy managers to attain better correlation between supply and demand, enhance solar energy production, and encourage the use of sustainable energy resources. Extension of this study in future work would involve the use of real-time data coupled with adaptive learning models to improve the prediction resilience.
Peer to Peer (P2P) IR Optical Communication used for Underwater or Open Air Medium
Authors: Reena Durugwar  , Prof Dr. Sanket B. Kasturiwala  
Published: December 2024

Although the hydrosphere protects most of the world, scientists and researchers from all over the world think that the world is underwater because it is difficult to know the concept of underwater optical wireless communication (UOWC) has recently received a lot of attention is not new , seawater's reduced blue-green light absorption window has rekindled interest in it recently, but the security issues surrounding it have received little attention. In this paper, we show how messages sent using UWOCs can be heard without the intention of the sender or receiver, using diffraction collision. This is attributed to its high data exchange capacity and low cost. Therefore, we organize this review around various aspects of the Underwater Optical Remote Switching (UOWC) field; here we introduce the main communication techniques and present their shortcomings and merits. Underwater optical wireless communications can support higher data rates with lower latency than their acoustic and RF counterparts. We also show for the first time that UWOC is possible even in the ultra-saline Dead Sea by analyzing how many Gaussian beams propagate through the water. We will review the connections and project plans and present a summary of the most prominent works from 1992 to the present. The paper is focused on those who need to embrace and concentrate on UOWC. [2] It ours an outline of the ongoing innovations and those possibly accessible soon. Specific consideration has been given to obring a new reference index, particularly on the utilization of single-photon collectors. We measure how far away the receiver can hear the message. Many theoretical studies and experiments focus on achieving effective communication strategies. This is important for optimization, military and security purposes, and for the management of maritime assets. Underwater communication technology, which uses acoustic or electromagnetic waves (in the radio frequency spectrum or light spectrum), has made great progress with the use of telephones and wireless. Although acoustic communication accepts long-distance communication, its low data rate, high speed, and negative effects on sea air have made people aware of communication based on electric waves. Electromagnetic waves provide high data and high speed communication. Also, the turbidity of the water does not affect underwater RF communication, air and water exchange. [2] However, they are very expensive. Surprisingly, none of the above methods can match the performance of wireless communication in the spectrum. We also examine the most important moments affecting light propagation and consider them together with coding techniques.
PENGARUH MEDIA PEMBELAJARAN PLAYDOUGH TEIRHADAP PERKEMBANGAN KREATIVITAS ANAK USIA 5-6 TAHUN DI TK GKPI TARUTUNG KOTA
Authors: Harefa Sefi Putri , Samosir Rotua , Butar Butar Mei Lastri E.F. 
Published: December 2024

The purpose of this study is to find out how much influence the meidiia playdough teaching is in the balance of the credibility of children aged 5-6 years of kindergarten GKPI Tarutung Kota. The data collection tools in this study are observation, interviews, and documentation. The sample in this study is children aged 5-6 years who are divided into two groups, namely group B2 as the experimental group and group B3 as the control group. The hypothesis test in this study is a t-test using the help of the Microsoft Excel computer program and the SPSS version 21 program. Based on the results of the Posttest test between the experimental group and the control group, there was a significant difference. The results of the experimental group and the control group normality of the sig. (2-tailed) of 0.081 and 0.666 is greater than the significance level of 0.005 and the homogeneity of the Fcal value is 0.050 will be compared with the value of Fcal with the provision of the numerator dk (n1-1; 8-1=7) and the denominator dk (n2-1; 25-24=24) which is 2.42. So it is known that Fcalung < Ftabel (0.050 < 2.42) sig. Based on the results of the t-test, the Equal Varince Assumed value is calculated > ttable (α=0.05; df= 48), namely tcal= 4.736 > ttable = 2.021 or can be seen in the significant value of Equal Varince Ascetic, which is 0.000 < 0.05. It turned out that the ttable > calculation was 4,736 > 2,021, so Ho was rejected and Ha was accepted. This means that the teacher of the playdough is facing the balance of the creativity of children in the age of 5-6 years of GKPIi Tarutung Kota Kindergarten.
La viveza boliviana y su relación con la decadencia moral de la sociedad
Authors: Condori Cáceres René Percy , Ramos Cárdenas Obed Tatiana , Camacho López Harold Alejandro , Mejia Bohorquez Alejandro Amilcar , Aráoz Rioja Nidia Edith 
Published: December 2024

La investigación aborda el fenómeno de la "viveza boliviana", un comportamiento cultural que prioriza beneficios personales mediante la transgresión de normas éticas y sociales. A través de un enfoque mixto (cualitativo y cuantitativo), se estudió este fenómeno en la ciudad de Oruro, Bolivia, seleccionando una muestra de personas de 16 a 40 años en mercados, plazas y otros espacios concurridos. Se utilizaron encuestas, entrevistas y observación para recolectar datos. Los resultados revelan que el 77.8% de los encuestados percibe que la "viveza boliviana" contribuye a la pérdida de valores morales, mientras que un 55.6% la considera una parte de la identidad cultural. Factores como la falta de educación (44.4%), la cultura arraigada (33.3%) y la pobreza (11.1%) fueron identificados como causas principales de este comportamiento. Aunque negativamente visto, es comúnmente aceptado como astucia o inteligencia. Las conclusiones subrayan que este fenómeno fomenta el individualismo y deteriora el bienestar colectivo, con efectos negativos sobre la moralidad social. A pesar de su aceptación en algunos sectores, su normalización perpetúa la crisis de valores en la sociedad orureña y boliviana. Se propone que la educación integral y el fortalecimiento de valores éticos son fundamentales para contrarrestar este problema cultural profundamente arraigado.
Determinants of Market Participation among Vegetable Growers in West Coast Region, The Gambia
Authors: Boye Mortala , Fatty Lamin KM , Bah Abubacarr A. 
Published: December 2024

Aims: This study aimed to identify factors that influencing vegetable growers' decision to participate in output market in the West Coast Region of The Gambia.
Study Design: A cross-sectional data involving a sample of 138 vegetable producers were selected using multi-stage sampling technique.
Methodology: Data was collected through in-person interview using semi-structured questionnaire and analyzed using descriptive and Probit model.
Results: Results from Probit model analysis show that gender, access to transportation, access to credit, belonging to a farmer association, and access to market information were the main significant factors influencing vegetable growers to participate in the output market.
Conclusion: The findings highlight that government and other stakeholders dedicated to supporting the well-being of vegetable growers need to improve the existing infrastructure, strengthen farmer organizations, and enhancing access to credit and market information.
Association of Seropositivity and Mortality in Rheumatoid Arthritis and the Impact of Treatment With Disease‐Modifying Antirheumatic Drugs: Results From a Real‐World Study
Authors: Alemao Evo , Bao Ying , Weinblatt Michael E. , Shadick Nancy 
Published: September 2019

ObjectiveSeropositivity for anti–citrullinated protein antibody (ACPA)/rheumatoid factor (RF) in rheumatoid arthritis (RA) is associated with increased overall mortality; however, the association between antibody titers and mortality is not well established. Investigating relationships between antibody titers and mortality may clarify their role in RA pathogenesis. This study was undertaken to evaluate the association of antibody titers with mortality and its modification by disease‐modifying antirheumatic drugs (DMARDs).MethodsEligible patients with established RA were identified through administrative claims data linked to laboratory results (2005–2016). Patients were categorized by positivity status for ACPA, RF, or both. Patients were further divided into groups by autoantibody titers. DMARD‐exposed patients were categorized into biologic DMARD (bDMARD) and conventional DMARD (cDMARD) subcohorts. Crude mortality rates/1,000 patient‐years and Kaplan‐Meier curves were compared between antibody categories. Adjusted Cox proportional hazards regression and sensitivity (propensity‐matched patients) analyses were conducted.ResultsOverall, 53,849 and 79,926 patients had evaluable ACPA and RF status, respectively. For both autoantibodies, mortality rates were significantly higher in seropositive versus seronegative patients (risk increase of 48.0% and 44.0% in ACPA‐ and RF‐positive patients, respectively; P < 0.001 each). Mortality rates were greatest in patients with higher versus lower autoantibody titers (ACPA hazard ratio [HR] 1.60 [95% confidence interval (95% CI]) 1.45–1.76]; RF HR 1.78 [95% CI 1.66–1.91]). In cDMARD‐exposed patients, HRs were higher in seropositive versus seronegative cohorts; in bDMARD‐exposed patients, there was no difference in mortality by serostatus.ConclusionElevated ACPA/RF titers were independently associated with increased mortality among patients with RA and persisted in patients treated with cDMARDs but not with bDMARDs.
Photo‐/Thermal‐Responsive Field‐Effect Transistor upon Blending Polymeric Semiconductor with Hexaarylbiimidazole toward Photonically Programmable and Thermally Erasable Memory Device
Authors: Liu Yidong , Yang Yizhou , Shi Dandan , Xiao Mingchao , Jiang Lang , Tian Jianwu , Zhang Guanxin , Liu Zitong , Zhang Xisha , Zhang Deqing 
Published: September 2019

AbstractIt is shown that the semiconducting performance of field‐effect transistors (FETs) with PDPP4T (poly(diketopyrrolopyrrole‐quaterthiophene)) can be reversibly tuned by UV light irradiation and thermal heating after blending with the photochromic hexaarylbiimidazole compound (p‐NO2‐HABI). A photo‐/thermal‐responsive FET with a blend thin film of PDPP4T and p‐NO2‐HABI is successfully fabricated. The transfer characteristics are altered significantly with current enhanced up to 106‐fold at VG = 0 V after UV light irradiation. However, further heating results in the recovery of the transfer curve. This approach can be extended to other semiconducting polymers such as P3HT (poly(3‐hexyl thiophene)), PBTTT (poly(2,5‐bis(3‐tetradecylthiophen‐2‐yl)thieno[3,2‐b] thiophene)) and PDPPDTT (poly(diketopyrrolopyrrole‐dithienothiophene)). It is hypothesized that TPIRs (2,4,5‐triphenylimidazolyl radicals) formed from p‐NO2‐HABI after UV light irradiation can interact with charge defects at the gate dielectric–semiconductor interface and those in the semiconducting layer to induce more hole carriers in the semiconducting channel. The application of the blend thin film of PDPP4T and p‐NO2‐HABI is further demonstrated to fabricate the photonically programmable and thermally erasable FET‐based nonvolatile memory devices that are advantageous in terms of i) high ON/OFF current ratio, ii) nondestructive reading at low electrical bias, and iii) reasonably highly stable ON‐state and OFF‐state.
Donor Polymer Can Assist Electron Transport in Bulk Heterojunction Blends with Small Energetic Offsets
Authors: Yin Hang , Ma Lik‐Kuen , Wang Yilin , Huang Jiachen , Yu Han , Zhang Jianquan , Chow Philip C. Y. , Ma Wei , So Shu Kong , Yan He 
Published: September 2019

AbstractConventional organic solar cell (OSC) systems have significant energy offsets between the donor and acceptor both at the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels. Because of this, in a bulk heterojunction (BHJ) system, electrons typically transport in acceptors, whereas holes typically transport in donors. It is not favorable for electrons to hop back and forth between the donor and acceptor because the hopping is energetically disfavored. In such conventional OSC systems, the addition of donor polymer to acceptor films should typically reduce the electron mobility. In this study, a surprisingly large increase (up to 30×) in electron mobility is observed in an OSC blend when introducing a polymer donor into small molecular acceptor. By ruling out morphology reasons, it is shown that the donor polymer can assist the electron transport by providing “bridges” or a “shortcut” for electron transport across the domains of small molecular acceptors. This can happen because, for these systems, the LUMO offset is small. The study shows the benefits of donor‐assisted electron transport in BHJ systems with small energetic offsets. This finding could be also applied to other fields to tune the optimized charge transport property of organic materials or slush blends.
Reaction and Energy Levels at Oxide–Oxide Heterojunction Interfaces
Authors: Kung Hao‐Ting , Li Peicheng , Lee Jae‐Jin , Zhao Yongbiao , Dumont Antoine , Lu Zheng‐Hong 
Published: September 2019

AbstractOxide–oxide heterojunction interfaces (OHIs) are foundations for many applications such as transistors, optoelectronic devices, and chemical catalysis. The formation of OHIs involves complex events such as charge transfer, interfacial diffusion, and chemical reactions. These events collectively contribute to an OHI's energy structure and to its ability to perform an intended application. Here, multiple MoO3/oxide interfaces are studied at which changes in multiple oxidation states Mox+ can be easily tracked. For the formation of reactive interfaces, it is found that the primary driving force behind the reduction of MoO3 is redox reactions at the interfaces. For the nonreactive interface, the reduction of MoO3 occurs as a result of various factors such as oxygen deficiency. At these OHIs, band bending and formation of interface dipole are observed. It is discovered that the degrees of interface dipole and work function at the OHIs scale linearly as a function of the contacting oxide's work function. These findings provide the guide in designing OHIs for a specific application.
Reconfigurable Periodic Liquid Crystal Defect Array via Modulation of Electric Field
Authors: You Ra , Choi Yun‐Seok , Shin Min Jeong , Seo Min‐Kyo , Yoon Dong Ki 
Published: September 2019

AbstractTopological defects in liquid crystal (LC) phases have been considered critical from the areas in topology and self‐assembly, as well as in applications such as optical vortex generation, particle manipulation system, and template for material micropatterning. An approach for generating and modulating various patterns of LC defects is presented in a single cell by varying the electrode configurations. Periodic LC defect arrays including −1 topological defect in the nematic phase can be achieved by simply adjusting crossed electrodes. Specifically, the fourfold symmetric −1 defect pattern is used as a vortex beam generator and a particle trapping agent with control either of the frequency of the applied electric field or the temperature. The approach suggested here would be beneficial to extend the use of LC patterns in lithographic tools and optoelectronic devices.
Quenching‐Resistant Polymer Carbon Dot Preserving Emission Color Consistency in Solid‐State
Authors: Kwak Byeong Eun , Yoo Hyo Jeong , Kim Do Hyun 
Published: September 2019

AbstractSolid‐state luminescent carbon dot without dispersion matrices is studied to overcome aggregation‐caused quenching, but it usually shows spectral shift between solution‐ and solid‐state accompanying a dramatic decrease of fluorescence intensity, which hinders a real application. Herein, polymer carbon dot (PCD) showing solid‐state luminescence without red‐shift is synthesized by low‐temperature reaction. The PCD solution and solid have the same emission peaks at 434 nm and similar absolute quantum yields of 68.2% and 62.7%, respectively, which is uncommon feature compared to other carbon dots. The mechanism for solid‐state luminescence and emission color consistency is investigated by structural analysis of the PCD compared to carbon dot that shows red‐shift in solid‐state. The PCD is utilized into light‐emitting diode application as a phosphor, and little color change in emission without significant decrease in luminous efficacy is achieved even with high loading fraction (50 wt%), opening the possibility of real application in solid‐state lighting.
The Optical Properties and Plasmonics of Anisotropic 2D Materials
Authors: Wang Chong , Zhang Guowei , Huang Shenyang , Xie Yuangang , Yan Hugen 
Published: September 2019

AbstractIn the fast growing 2D materials family, anisotropic 2D materials, with their intrinsic in‐plane anisotropy, exhibit a great potential in optoelectronics. One such typical material is black phosphorus (BP), with a layer‐dependent and highly tunable bandgap. Such intrinsic anisotropy adds a new degree of freedom to the excitation, detection, and control of light. Particularly, hyperbolic plasmons with hyperbolic q‐space dispersion are predicted to exist in BP films, where highly directional propagating polaritons with divergent densities of states are hosted. Combined with a tunable electronic structure, such natural hyperbolic surfaces may enable a series of exotic applications in nanophotonics. Herein, the anisotropic optical properties and plasmons (especially hyperbolic plasmons) of BP are discussed. In addition, other possible 2D material candidates (especially anisotropic layered semimetals) for hyperbolic plasmons are examined. This review may stimulate further research interest in anisotropic 2D materials and fully unleash their potential in flatland photonics.
Growth and Characterization of Vanadium Dioxide/Niobium Doped Titanium Dioxide Heterostructures for Ultraviolet Detection
Authors: Creeden Jason A. , Madaras Scott E. , Beringer Douglas B. , Novikova Irina , Lukaszew Rosa A. 
Published: September 2019

AbstractThe properties of VO2/TiO2:Nb heterostructures are engineered for their potential use in ultraviolet (UV) detection and observed external quantum efficiency (EQE) exceeding 100% in both near UV (405 nm) and UV‐C (254 nm) spectral regions. The proposed UV detection scheme is based on vanadium dioxide (VO2) thin films epitaxially grown on niobium doped titanium dioxide (TiO2:Nb). Such VO2/TiO2:Nb heterostructure exhibits enhanced photocurrent due to cation doping engineering in a space‐charge region thus yielding favorable conditions for hole tunneling from TiO2:Nb into VO2. The heterostructure is engineered and photocurrent is optimized by varying the VO2 film thickness, reaching up to 5000% EQE for 405 nm and up to 17 000% EQE for 254 nm light, indicating that the VO2/TiO2:Nb system can be fine‐tuned for efficient UV photodetection.
Dendrite‐Free Flexible Fiber‐Shaped Zn Battery with Long Cycle Life in Water and Air
Authors: Guan Qun , Li Yongpeng , Bi Xuanxuan , Yang Jie , Zhou Jingwen , Li Xuelian , Cheng Jianli , Wang Zhuanpei , Wang Bin , Lu Jun 
Published: September 2019

AbstractFiber‐shaped aqueous rechargeable Zn batteries (FARZBs) show flexibility, good reliability, cost‐effectiveness, high energy/power densities, and high safety that have attracted increasing attention as promising energy storage devices for future wearable applications. However, the development of FARZB is limited by its poor cycling life and inferior charge–discharge performance, mainly suffering from zinc dendrite growth and increasing electrode irreversibility. In this work, dendrite‐free fiber‐shaped Zn//Co3O4 rechargeable batteries with a long cycle life tested in water and air, are obtained via tuning the surface binding energy of Zn on the anode using the zincophilic N,O‐functional carbon fiber, as well as engineering the Co3O4 cathode with a nanowire array structure. The fiber‐shaped Zn//Co3O4 full battery demonstrates remarkable long cycle life in water and air with high energy density, impressive flexibility, and excellent waterproof ability (fully immersed and charged/discharged under water for more than 33 h for 3000 cycles with capacity retention of ≈80%). The reversible electrochemical mechanisms of the FARZBs, without obvious zinc dendrite deposits and structural change of Co3O4 nanowires, are confirmed by a series of characterizations. These results demonstrate that the FARZBs are promising power sources for emerging wearable electronics.