bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pengaruh Electronic Word Of Mouth Dan Kualitas Pelayanan Terhadap Keputusan Berkunjung (Studi Kasus Pada Wisatawan Agro Edu Park Mabda Islam Sukabumi)
Authors: Sidik Amri May Maulana , Lutfia Evi 
Published: October 2024

Penelitian ini bertujuan untuk mengetahui pengaruh electronic word of mouth dan kualitas pelayanan terhadap keputusan berkunjung (studi kasus pada wisatawan Agro Edu Park Mabda Islam Sukabumi). Penelitian ini merupakan penelitian kuantitatif dengan menggunakan metode survei dan data primer, yaitu data berupa kuisioner yang diberikan langsung kepada responden untuk diisi dan dikembalikan lagi kepada peneliti. Populasi yang digunakan dalam penelitian ini yaitu wisatawan Agro Edu Park Mabda Islam Sukabumi sebanyak 99, dengan sampel sebanyak 99. berdasarkan hasil uji t menunjukan bahwa variabel electronic word of mouth (X1) berpengaruh positif signifikan terhadap keputusan berkunjung (Y) dengan nilai signifikasi adalah 0,000<0,05 dan nilai t-statistic (thitung) > ttabel. (4,120>1,984) sehingga Ha diterima.sedangkan variabel kualitas pelayanan (X2) berpengaruh positif dan signifikan terhadap keputusan pembelian (Y) dengan nilai signifikasi adalah 0,000<0,05 dan nilai t-statistic (thitung) > ttabel. (4,818>1,984) sehingga Ha diterima. Berdasarkan hasil dari uji f menunjukan bahwa variabel electronic word of mouth (X1) dan kualitas pelayanan (X2) secara simultan dan signifikan memiliki pengaruh terhadap keputusan berkunjung (Y) dengan nilai prob sebesar 0,000<0,05. Dan Fhitung > Ftabel atau (61,161 > 3,091) sehingga Ha diterima.
Influence of Climate Change on Plant Biodiversity and Agriculture: A Review from a Sub-Tropical Perspective
Authors: Mohammadi Noorulhaq , Sayedi Sayed Ahmad , Sirat Sultan Mohammad , Mati Matiulhaq 
Published: October 2024

Climate change is a very severe problem, in particular for plant biodiversity. Climate change refers to an important change in worldwide temperature, precipitation, and wind patterns that occurs due to human activities, especially in recent decades. Biodiversity is threatened by climatic patterns due to changes in the ecosystem. Biological diversity is home to many living things. Biodiversity is classified into three levels, such as genetic, species, and ecosystem diversity. The several usages of biodiversity comprise consumptive use (75%), productive use, social value, aesthetic value, ecosystem service value, scientific value, and evolutionary value. Several dangers influence biodiversity, and land use plays a major role. Afghanistan is retrieving population data, estimated to be 42.239 million people, and has yearly 2.6% growth. Subtropical countries such as Afghanistan are the most vulnerable to climate change because they are characterized by terrible droughts, repeated floods, water deficiencies, and an overall undesirable environmental sustainability balance. That it’s important to study about the influence of climate change on plant biodiversity, an instance particularly of Afghanistan, and to declare the problems for future mitigation and to create better reservations and cures by best of suggestions techniques.
Исследование процессов тепломассопереноса в нефтяной скважине с~призабойным нагревателем различной длины
Authors: Пинягин Дмитрий Сергеевич , Труфанова Наталия Михайловна , Костарев Никита Александрович 
Published: October 2024

This paper considers a three-dimensional mathematical model of heat and mass transfer in an oil well with a bottom-hole heater. The vertical section of an oil well with an electric bottom-hole heater device for wells with highly viscous and paraffinic oil was investigated. The bottomhole heater is a monolithic cylinder located in the lower part of the tubing. The tubing contains perforations through which the oil fluid enters the tubing. The use of a local heater in the near-wellbore area makes it possible to increase the temperature of the fluid flowing through it, thereby reducing the viscosity of the oil and the load on the electric centrifugal pump, for which the critical value of the viscosity of the pumped medium is determined. The implementation of this model was carried out by the finite volume method using the ANSYS engineering simulation software. The geometry of finite elements and the finite volume mesh generated, an analogue of a continuous computational domain, were constructed by the MESH preprocessor. The finite volume mesh consists of polyhedral elements. Using the model, the fields of temperature, velocity and viscosity were obtained throughout the entire volume of the area under study. The curves showing the dependence of the average temperature of the cross section on the longitudinal coordinate of the tubing and the dependence of the average temperature at the inlet to an electric centrifugal pump on the heater power are presented. The viscosity value at the maximum permissible temperature of the heater, as well as the value of sufficient heater power to ensure uninterrupted pumping of petroleum liquid, were determined. The results obtained can be used to significantly improve the operating efficiency of an electric centrifugal pump, to increase the turnaround time and to reduce material costs during field development.
Конвективные режимы псевдопластической жидкости в квадратной полости при воздействии высокочастотных вибраций в условиях пониженной гравитации
Authors: Никулина Светлана Анатольевна , Перминов Анатолий Викторович , Любимова Татьяна Петровна 
Published: October 2024

In this paper, we investigate convective modes of pseudoplastic fluid in a square cavity with solid perfectly heat-conducting boundaries under reduced gravity. The cavity performs vertical linearly polarized high-frequency vibrations. Between the vertical walls of the cavity a temperature drop is prescribed in the direction perpendicular to vibrations and the field of gravity. The fluid rheology is described using the Williamson model. The problem is solved based on the averaged thermovibration convection equations for nonlinear viscous fluids. The vibration intensity is determined by the vibration parameter V, which is proportional to the ratio of the amplitude of the vibration acceleration to the free-fall acceleration and does not depend on the temperature difference. The problem is found to have two types of solutions, which we call Newtonian and non-Newtonian modes. These solutions correspond to different convective structures, for which the dependences of the maximum of the stream function and the Nusselt number on the Grashof number are derived. We use these dependences for determining at different values of rheological parameters the threshold values of the Grasgof numbers, corresponding to the change in the modes of stationary averaged convection and the critical Grasgof numbers, corresponding to the loss of stability of stationary averaged flow and the occurrence of oscillatory modes of averaged convection. The structures of different modes of averaged stationary and oscillatory convection are studied. The results obtained for the Newtonian mode have shown that at small values of the Grasgoff number, a slow one-vortex stationary convective flow is realized in the cavity. With increasing the Grasgoff number it transforms into a three-vortex flow. A further increase in the Grasgoff number results in the appearance of a four-vortex convective flow, which eventually transforms again into a three-vortex motion. At even greater Gr, the stationary averaged motion becomes unstable and the oscillatory modes appear in the cavity. For the non-Newtonian mode, a stationary convective flow is the basic flow pattern detected in the cavity; the oscillatory modes are not observed in the whole investigated range of the Grasgoff numbers.
Моделирование течения воздуха в упруго-деформируемой пористой среде, аппроксимирующей легкие человека: структура модели, ее основные уравнения и разрешающие соотношения
Authors: Трусов Петр Валентинович , Зайцева Нина Владимировна , Цинкер Михаил Юрьевич , Нурисламов Владислав Владимирович 
Published: October 2024

This paper is devoted to refining the mathematical model of the human respiratory system designed to predict the occurrence of respiratory pathologies caused by the negative effects of atmospheric air pollution. It is difficult to identify individual air channels in the human lungs, consisting of small respiratory tracts, called alveoli, through which oxygen from the air passes into blood. Therefore, the human lungs are modeled as a two-phase elastically deformable saturated porous medium, in which one phase is the deformable skeleton of the medium (lung tissue) described by the model of deformable solid body, and the other phase is gas filling the porous space. We construct the model of air flow in the human lungs, which consists of the sub-model of elastic deformation of the porous lung medium, experiencing large displacement gradients, and the sub-model of air filtration through the deformable porous medium. The model takes into account the relationships between sub-models of the respiratory system, i.e. we consider the coupled problems of deformation and filtration in differential form. Since at present the analytical solution of the stated essentially nonlinear problem is unfeasible, the problem is formulated in a generalized weak form to allow subsequent application of numerical methods using the Galerkin method. For the numerical solution of the nonlinear problem of deformation of the two-phase lung medium, it is suggested to use the finite element method, for the filtration problem - the finite volume method. The resolving relations needed to solve the formulated sub-problems are derived. To solve the nonlinear problem, we developed algorithms and a set of programs. The description of these computational tools, as well as analysis of the results obtained will be presented in our the next paper.
Конечно-элементное моделирование нелинейных задач упругости в абсолютных узловых координатах на неструктурированных шестигранных сетках
Authors: Караваев Александр Сергеевич , Копысов Сергей Петрович 
Published: October 2024

We consider a finite element approach to solving the problem of elasticity theory in terms of absolute nodal coordinate formulation (ANCF), in which large body displacements are described in a global reference frame without using any local coordinate system. The main feature of the method is the absence of gyroscopic effects and, as a result, constancy of the mass matrix and the vector of the generalized force of gravity. In contrast to the traditional ANCF approach, the sets of nodal degrees of freedom of the finite element are formed only on the basis of absolute coordinates of nodes, which allows us to solve the problem using, in particular, unstructured hexahedral meshes. To construct the stiffness matrix, we apply a second-order automatic differentiation algorithm, which ensures its symmetrical form (Hessian matrix) and is analytically accurate in calculating the derivative. This approach also makes it possible to carry out calculations for models of hyperelastic materials without the corresponding Piola-Kirchhoff tensor. It has been shown that within the framework of discretization of the equation of motion, along with the well-known Newmark numerical integration scheme, it is possible to use the HTT-α scheme, which is unconditionally stable, second-order accurate and dissipative for high frequencies. We present several examples of solving static and dynamic elasticity problems for compressible and incompressible models of hyperelastic materials, in which the functions of internal energy density of the body are specified in terms of the deformation gradient.
Effect of Solid-State Fermentation on Phytochemical Composition of Rice Bran Meal
Authors: Ishaku A. H.  , Kela E. , Ahmed Y. 
Published: October 2024

In aquaculture, the available feed ingredients are expensive and limited in quantity making it essential to explore fish feed ingredients that are low-cost and locally available. Agro by-products seems to be one of the available source. This study evaluate the effect of solid state fermentation on phytochemical compositions of rice bran meal. Rice bran was collected in three different containers, ground into powder, then sieved and fermented using solid state fermentation procedure. Each sample was solidly fermented (wet at 10% moisture and keep in fermenter at ambient temperature) for 24 hours (1 day), 96 hours (4 days), and 168 hours (7 days). Afterward, the fermented samples were oven dried for one hour at 100oC as described. The fermented samples were taken to the laboratory for phytochemical analysis. The results obtained from this study revealed that fermenting rice bran for seven days (168hrs) using solid state fermentation method reduced the Alkaloid contain from 12.61±1.04 mg/kg to 10.24±1.52 mg/kg, 9.18±0.11 mg/kg and 8.13±0.16 mg/kg. Phytate from 6.73±1.32mg/kg to 4.39±0.82mg/kg, 4.05±0.56mg/kg and 2.15±0.73mg/kg. Tannins from 4.60±0.13 mgTA/kg to 4.11±0.65 mgTA/kg, 3.26±0.47 mgTA/kg and 1.52±0.24 mgTA/kg. Saponins from 2.98±0.54 g/kg to 2.50±0.17 g/kg, 1.88±1.54 g/kg and 1.43±1.17 g/kg. Oxalate from 2.78±1.25 mg∞/100g to 2.47±1.42 mg∞/100g, 2.91±0.31 mg∞/100g and 1.82±0.13 mg∞/100g. However, it increases Flavonoids from 6.94±1.82 mgRutin/kg to 7.90±1.35 mgRutin/kg, 9.03±0.43 mgRutin/kg and 11.18±1.35 mgRutin/kg. Phenols from 1.71±0.32 gGAE/kg to 2.14±0.12 gGAE/kg, 2.91±1.53 gGAE/kg and 3.58±1.65 gGAE/kg. This study establishes the fact that, fermented rice bran meal can be incorporated as an essential part of the feed production in order to reduced cost of production thereby increasing the profit and enhances waste management.
Development of ExG, ExR, ExGR, HSV, CIELAB Images from RGB Images Using Image Segmentation Algorithm in Computer Vision Based Herbicide Spraying Applications
Authors: Rao Koduru Koteswara , B Raj Kiran , Rao Srinivasa , K Lavanya 
Published: October 2024

Weed management in agriculture is critical for preventing crop yield losses, with traditional methods often leading to environmental harm and increased production costs. This study explores the development of color indices and models for weed detection in computer vision-based herbicide spraying applications. Among the all sensors, RGB colour cameras offer several advantages, including low cost and wide availability of image processing libraries tailored for RGB image analysis. In present study a Logitech C270 webcam was used for acquiring the RGB images and a specially python algorithm was developed for image segmentation based on color. Excess Green (ExG), Excess Red (ExR), Excess Green minus Red (ExGR), HSV, and CIELAB color model images are developed by using algorithm. The research demonstrates that while ExG and ExGR indices are effective under specific conditions, the CIELAB model offers superior segmentation results across varying lighting environments. Among all these color indices and models, particularly CIELAB, can enhance the precision of weed detection in automated herbicide applications, thereby reducing environmental impact and improving agricultural efficiency.
Longitudinal modulation of electron and mass densities at middle and auroral latitudes: Effect of geomagnetic field strength
Authors: Wang Hui , Zhang Jing , Lühr Hermann , Wei Yong 
Published: May 2017

AbstractIn this study, the effect of a reduction in magnetic field strength on the longitudinal modulation of electron density (ΔNe) and mass density (Δρ) is investigated. We study conditions during the September equinox and June and December solstices at middle and auroral latitudes in both Northern and Southern Hemispheres. The Global Ionosphere‐Thermosphere Model was employed for the theoretical study. Simulations were performed with a realistic International Geomagnetic Reference Field (IGRF) model and an IGRF model reduced in strength by 50%. The reduction in field strength increased the longitudinal variations in ΔNe by 2–34% in the nighttime sector but reduced the variation by 7–20% in the daytime sector at midlatitudes in both hemispheres. Conversely, at auroral latitudes ΔNe was reduced by 2–32% at all local times. The changes during equinoxes are larger than those for the solstices. The differences with local time in the response of ΔNe to a reduction in magnetic field strength were mainly due to changes in the oxygen/molecular nitrogen (O/N2) ratio in the Northern Hemisphere, whereas the differences were due to the combined effects of vertical winds and changes in the O/N2 ratio in the Southern Hemisphere. Both vertical winds and horizontal
convection eliminated ΔNe at high latitudes. Δρ got enhanced at both middle and auroral latitudes, which was related to the enhanced Joule heating effect when the magnetic field was reduced.
Longitudinal variations of topside ionospheric and plasmaspheric TEC
Authors: Zhong Jiahao , Lei Jiuhou , Wang Wenbin , Burns Alan G. , Yue Xinan , Dou Xiankang 
Published: May 2017

AbstractThe upward looking ionospheric total electron content (TEC) from the MetOp‐A and TSX satellites during 2008–2015 has been used to systematically study the longitudinal variations of the topside ionosphere and plasmasphere. The results of this study are summarized as follows: (1) There are significant longitudinal variations in the topside ionosphere and plasmasphere at low latitudes. The TEC maximum during the June solstice over the Western and Central Pacific Ocean corresponds to a TEC minimum at the same location during the December solstice, but the opposite behavior occurs over South America and the Atlantic Ocean. (2) During the solstices, the relative longitudinal variations in the geomagnetic equatorial region do not have a strong dependence on local time and solar activity. (3) The TEC in the winter hemisphere decreases with increasing solar activity, especially at higher altitudes and at night. The topside TEC depletion with solar activity depends on longitude. (4) The solstice‐like longitudinal pattern lasts much longer than the equinox‐like patterns, with the June solstice pattern lasting the longest. Furthermore, the equinox‐like longitudinal patterns occur in March when expected, whereas they extend from the autumnal equinox until the end of October. (5) The longitudinal variations of upward looking TEC are different from the corresponding longitudinal variations of electron densities around the F2 peak and orbital altitudes. This indicates that the topside ionosphere structure is strongly influenced by the physical processes in the topside region, rather than being a pure reflection of the ionospheric F2 peak structure.
Long‐term trends in precipitation and precipitation extremes and underlying mechanisms in the U.S. Great Basin during 1951–2013
Authors: Xue Tingting , Tang Guoping , Sun Lin , Wu Yuzhen , Liu Yonglin , Dou Yifeng 
Published: May 2017

AbstractUsing daily precipitation records from 151 stations, the Mann‐Kendall nonparametric test, and the rotated empirical orthogonal function, this study examined trends in precipitation and precipitation extremes and underlying mechanisms in the U.S. Great Basin during 1951–2013. The results indicate that annual total precipitation, 1 day and 5 day maximum precipitation, extreme precipitation days over the 95th and 99th percentiles trended upward during 1951–2013. Spatially, stations experienced significant positive trends in six indices are mostly distributed in the eastern basin, while those experienced significant negative trends are a few and situated in the western basin. Four distinct modes characterized by different patterns of annual precipitation variations were identified. They are the northeastern, southern, midwestern, and midnorthern modes. In addition, we found that the effects of El Niño–Southern Oscillation and Pacific Decadal Oscillation on precipitation was low in the basin. The intensifying high‐pressure system over the western North Pacific in winter and the increasing water vapor and air temperature of the atmosphere over the basin in winter and spring were mainly responsible for the upward trends in six indices during 1951–2013. Nevertheless, the topography regulates the effects of synoptic conditions on precipitation, contributing to the “east‐west” contrast in station distribution between those experienced negative and positive trends. Overall, precipitation and precipitation extremes increased significantly in the eastern and northern basin while increases were not significant in the western and southern basin. This information has important implications for not only predicting future precipitation changes but also mitigating precipitation‐change‐associated risks on ecosystems and human society in the Great Basin.
A Hybrid Mg2+/Li+ Battery Based on Interlayer‐Expanded MoS2/Graphene Cathode
Authors: Fan Xin , Gaddam Rohit Ranganathan , Kumar Nanjundan Ashok , Zhao Xiu Song 
Published: May 2017

AbstractThe hybrid Mg2+/Li+ battery (MLIB) is a very promising energy storage technology that combines the advantage of the Li and Mg electrochemistry. However, previous research has shown that the battery performance is limited due to the strong dependence on the Li content in the dual Mg2+/Li+ electrolyte. This limitation can be circumvented by significantly improving the diffusion kinetics of Mg2+ in the electrode, so that both Li+ and Mg2+ ions can be utilized as charge carriers. Herein, a free‐standing interlayer expanded MoS2/graphene composite (E‐MG) is demonstrated as a cathode for MLIB. The key advantage of this cathode is to enable the efficient intercalation of both Mg2+ and Li+. The E‐MG electrode displays a reversible capacity of ≈300 mA h g−1 at 20 mA g−1 in an MLIB cell, corresponding to a specific energy density up to ≈316.9 W h kg−1, which is comparable to that of the state‐of‐the‐art Li‐ion batteries (LIBs) and has no dendrite formation. The composite electrode is stable against cycling with a coulombic efficiency close to 100% at 500 mA g−1. This new electrode design represents a significant step forward for building a safe and high‐density electrochemical energy storage system.
Dielectric Response: Answer to Many Questions in the Methylammonium Lead Halide Solar Cell Absorbers
Authors: Anusca Irina , Balčiūnas Sergejus , Gemeiner Pascale , Svirskas Šarūnas , Sanlialp Mehmet , Lackner Gerhard , Fettkenhauer Christian , Belovickis Jaroslavas , Samulionis Vytautas , Ivanov Maksim , Dkhil Brahim , Banys Juras , Shvartsman Vladimir V. , Lupascu Doru C. 
Published: May 2017

AbstractDue to the unprecedented rapid increase of their power conversion efficiency, hybrid organic–inorganic perovskites CH3NH3PbX3 (X = I, Br, Cl) can potentially revolutionize the world of solar cells. However, despite tremendous research activity, the origin of the exceptionally large diffusion length of their photogenerated charge carriers, that is, their low recombination rate, remains elusive. Using frequency and temperature‐dependent dielectric measurements across the entire frequency spectrum, it is shown that the dielectric constant conserves very high values (>27) for frequencies below 1 THz in all three halides. This efficiently prevents photocarrier trapping and their recombination owing to the strong screening of charged entities. By combining ultrasonic and Raman spectroscopy with dielectric analysis, similarly large contributions to the dielectric constant are attributed to the dipolar disorder of the CH3NH3
+ cations as well as lattice dynamics in the gigahertz range yielding dielectric constants of εstat = 62 for the iodide, 58 for the bromide, and about 45 for the chloride below 1 GHz at room temperature. Disorder continuously reduces for decreasing temperature. Dipole dynamics prevail in the intermediate tetragonal phase. The low‐temperature orthorhombic state is antipolar. No indications of ferroelectricity are found.