Calculation Of Coefficients Research Articles

Comment on Lu et al. Ultrathin Terahertz Dual-Band Perfect Metamaterial Absorber Using Asymmetric Double-Split Rings Resonator. Symmetry 2018, 10, 293

In this study, the design of a dual-band terahertz absorber, previously published by Lu et al. (Symmetry 2018, 10, 293), was re-simulated. Our findings showed significantly different absorption results from those published in the article. A detailed analysis was conducted to explain this discrepancy, which was attributed to the reflection of an unaccounted orthogonal component of the waves from the design, rather than absorption. The metasurface design has two resonances at 4.48 THz and 4.76 THz, respectively. It was reported that at these frequencies, the structure achieved absorption of 98.6% and 98.5%, respectively. However, in our results, it was found that at the second resonance (4.76 THz), the structure acted as a strong cross-polarization converter, reflecting a significant amount of incident energy in the cross-polarization component of the reflected wave. When this component is considered in the reflection coefficient calculations, the absorption reduces to 41% (from 98.5%), which is not an acceptable level for an absorber. In addition, the structure was simulated for both lossy and lossless (FR4) substrate cases to understand the effect of substrate losses. The results showed that the absorption response significantly deteriorates at the first resonance (4.48 THz) in the case of a lossy FR4 substrate.

The Influence of Work Life Balance and Work Experience on Employee Performance in Rocket Chicken in the City of Yogyakarta

This research is useful to investigate the effects work life balace, along with work experience, impacts the employee performance. The sample in this study were employees who worked at Rocket Chicken, Yogyakarta City with the characteristics of having work experience of ≥ 1 year. The research utilized purposive sampling, involving 45 respondents in total. Primary data for this study comprises the perspectives of employees at Rocket Chicken in Yogyakarta City, collected via a questionnaire. The examinations conducted in this study included descriptive analysis, instrument validation (reliability and validity tests), assessment of classical assumptions, determination coefficient calculation, and hypothesis testing (t-test and F-test). The findings indicate a positive and significant impact of both work-life balance and work experience on employee performance. Work-life balance, with a regression coefficient of 0.731 and work experience with a coefficient of 0.769, show substantial effects on performance, supported by significance values of 0.00. Additionally, their collective influence is reinforced by an F-value of 17.308, exceeding the F-table value, and a significance value below 0.05 (0.00).

Evaluation of multi-layer urban canopy model (MLUCM) for urban microclimate predictions at different urban contexts

Modeling tools are often used to obtain a better understanding of the characteristics of urban microclimates. Among the different approaches to physics-based modeling, urban canopy models tend to be computationally faster than computational fluid dynamics (CFD) simulations. However, the evaluation of current urban canopy models for different urban characteristics is still limited, especially for wind speed. This study aims to evaluate the potential usability of the existing urban canopy model for microclimate variable prediction in different urban contexts, specifically the vertical city weather generator (VCWG) v1.4.5, which can predict microclimate variables at different vertical heights. The measurement data used in model evaluation were obtained from 248 weather stations in Seoul, Republic of Korea. The results showed that among the input parameters, a few variables had significant impact on the wind speed prediction results, namely, the turbulent coefficient during unstable conditions, the pressure gradient coefficient, and the aerodynamic roughness length. The discrepancy in wind-speed prediction tended to be lower during the summer season, with lower wind speeds at the rural weather station. Further investigations also addressed the significant parameters of wind speed prediction related to the calculation of the turbulent diffusion coefficient and pressure gradient.

Inverse Estimation of Thermal Contact Resistance Between Two Layers of Cylindrical Wall

This study presents a method for estimating the space-dependent thermal contact resistance between the two-layer walls of a furnace using the boundary element method (BEM) and conjugate gradient method (CGM) for the heat conduction problem. The global solution equation in matrix form is derived using the interface conditions, and the BEM is used to solve the direct problem. The CGM minimizes the objective function and calculates the sensitivity coefficients with the complex variable derivation method (CVDM). Comparative results show that the present approach is more accurate, stable, and efficient than the conventional CGM, which is attributed to the calculation of the sensitivity coefficients by CVDM. The effects of the value of thermal contact resistance, thermal conductivity ratio, Biot number, initial guess, measurement error, and the number and position of measurement points on the inversion results are also analyzed. Finally, the effectiveness of this approach is demonstrated through numerical examples, and the inversion results show its stability, efficiency, and accuracy in identifying different and complex distributions of thermal contact resistance. Furthermore, this approach is feasible for nonintrusive measurement, which is very meaningful in practical applications.

Calculations of backpatch factors and conversion coefficients for the personal dose equivalent for X-ray beams used in radiodiagnostic

The purpose of this study is to use the Monte Carlo N-Particle radiation transport code (MCNP) to calculate the conversion coefficients of air kerma for personal dose equivalent (Hp [Sv]) and Back Scattering Factors (BSF) for X-ray beams used in diagnostic radiography at potentials of 40, 50, 60, 70, 80, 90, 100, 120, and 150 kVp. Additionally, effective dose is determined using male and female anthropomorphic voxel-based simulators (REX and REGINA) as recommended by the International Commission on Radiological Protection (ICRP) Publication 110, along with tissue weight factors from ICRP Publication 103 to simulate whole-body irradiation. The results indicate that the relationship between operational metrics such as Hp and risk limitation metrics like effective dose varies from 0.14 to 0.71 for Radiation Qualities in Radiation (RQR) beams from the X-ray source assembly and up to 0.64 for Radiation Qualities based on a phantom with an added aluminium filter (RQA). When comparing the obtained values for air kerma conversion coefficients for personal dose equivalent with the value adopted by the National Commission for Nuclear Energy (CNEN) of 1.14 Sv/Gy for individual dose determination, it is observed that at low energies, the values are overestimated by up to 44%, while at high energies, the values are underestimated by up to 67%.

Data-mining framework for in-depth quantitative study of influences on low-wind-velocity area from morphological parameters of cuboid-form buildings

Wind environment is important in architectural sustainable design, as existing studies show that it can be considerably influenced by building morphologies. This study aimed to develop a data-mining framework to quantitatively evaluate and compare influences on Low-Wind-Velocity Area (LWVA) of common cuboid-form buildings with typical morphological parameters. The data-mining framework was originally developed by integrating multiple computational methods for rapid in-depth iterative analyses, including the generation of building models using parametric modelling, the big data generation based on hybrid model, and the statistical metric analysis method. The hybrid model was created by combining the CFD model and machine learning model. The accuracy and efficiency of the framework were fully demonstrated through the comprehensive validation and analyses of different models. The data of more than fifty thousand building cases with different morphological parameters and relevant wind conditions were generated and analyzed. Influences on LWVA of morphological parameters of cuboid-form building was comprehensively evaluated, including the visualization of multiple parameters, calculation and comparison of several correlation coefficients. It suggested that the reduction of height and width on the windward side would significantly decrease the LWVA and promote the outdoor ventilation. The change of depth would have relatively limited influence on the LWVA. Multivariate regression model-fit and variance analyses were further implemented, and it was found that there was a relatively significant linear correlation between the LWVA and morphological parameters. The equation of multivariate regression model was provided for extra rapid prediction. The study outcome could contribute to efficient evaluation of LWVA and provide useful information for sustainable design.

IJCM_152A: Assessment of Supportive Care Needs of Breast Cancer Patients and their Caregivers - A Cross Sectional Study at a Tertiary Care Centre, Vadodara

Background: Cancer diagnosis can be difficult for the patients as well as their families; who bear a disproportionate amount of caring burden. Research indicates that as patients’ needs rise, so do those of their caregivers. For holistic health care delivery, it is important for service providers to be cognizant of the difficulties faced by both. Objective: 1. To assess the needs of breast cancer patients and their caregivers. 2. To explore the factors associated with needs of the patients and their caregivers 3. To assess the relation between the needs of the patients and their caregivers Methodology: One hundred and fifty dyads of patients and their caregivers were purposely sampled and administered Supportive-Care-Needs-Surveys (SCNS) Short-form34 (SF-34), and SCNS-Partners and Caregivers respectively, by the interviewer in local language. Cronbach a was used to check reliability and median (IQR) scores were calculated for domains in each survey. Univariate analysis was done to identify factors affecting needs, followed by calculation of correlation coefficient between the needs of patients and of their caregivers. Results: All domains in the two scales were acceptable (Cronbacha>0.6) except Patient Care and Support (0.51) and Sexuality (0.19) domains in SCNS-SF34. Highest needs were reported by patients in Physical and Daily Living domain 40.62(31.5-56.5) and by caregivers in Work and Social Security 30.4(25-35.7), and Emotional and Psychological Needs 30.4(21.4- 35.7) domains. Patients’ and caregivers’ needs were significantly associated with patient’s disease status (p< 0.05), and a moderately positive correlation (r (148) = 0.41, p<0.001) was found between their needs. Conclusion: Patients and caregivers both reported unmet needs which were influenced by the patient’s disease status, and caretakers’ needs increased in tandem with patients’ needs. Studies to validate existing scales or create new ones and larger-scale comparable research including the private sector could aid in generalizability.

Federal Algorithm Design and Numerical Experiments of Ensemble Kalman Filter Data Assimilation Analysis Process

Based on the federated Kalman filter proposed by Carlson with linear systems, we propose a federated computing scheme for the ensemble Kalman filter (EnKF) assimilation analysis process for nonlinear systems, and give an optimal information fusion estimation algorithm weighted by diagonal matrix under the linear minimum variance criterion, that is, the assimilation analysis values of each variable in the global estimation are linear combinations of the assimilation analysis values of the corresponding variables in the local estimation of sub-filters, and the calculation of the combination coefficients is given. The federated algorithm of the EnKF assimilation analysis process for nonlinear systems is verified by the Lorenz (1963) system.

Electrical conductivity of hydrogen plasmas: Low-density benchmarks and virial expansion including e–e collisions

An improved virial expansion for the low-density limit of the electrical conductivity σ(T,n) of hydrogen as the simplest ionic plasma is presented. Quantum statistical methods provide exact values for the lowest virial coefficients, which serve as a benchmark for analytical approaches to electrical conductivity as well as for numerical results from density functional theory-based molecular dynamics simulations (DFT-MD) or path-integral Monte Carlo simulations. The correction factor introduced by Reinholz et al. [Phys. Rev. E 91, 043105 (2015)] is applied to describe the inclusion of electron–electron collisions in DFT-based calculations of transport coefficients. As a benchmark, the first virial coefficient is correctly described with this approach. The value of the second virial coefficient is discussed, and questions about its value according to DFT-MD simulations are addressed.

Calculation of the Absorption Coefficient of Ar-Broadened CO2 in the 4.3 μm Band Wing on the Basis of Asymptotic Line Wing Theory

Calculation of the Absorption Coefficient of Ar-Broadened CO2 in the 4.3 μm Band Wing on the Basis of Asymptotic Line Wing Theory

Wide band gap tuning of Mg doped ZnO thin films for optoelectronic applications.

Zinc oxide (ZnO) thin films with magnesium (Mg) doping have demonstrated significant potential due to their wide band gap, which enables efficient absorption of ultraviolet (UV) radiation while maintaining transparency to visible light. Sol-gel spin coating methods were used to deposit Mg-doped ZnO thin films. The solution was made with methanol as the solvent, and the starting materials were magnesium acetate tetrahydrate and zinc acetate dihydrate. The integration of Mg content in deposited ZnO films was investigated for structural, morphological, and optical properties using an X-ray diffractometer (XRD), scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), and UV-VIS spectrophotometer. Mg-doped ZnO films were produced on quartz substrates and post-annealed at 400°C. According to absorption coefficient calculations, the optical band gap of Mg-doped ZnO films is in the range of 5.4 eV which is ideal for a variety of applications in the field of optoelectronic devices.

Analisis Modul Proyek Penguatan Profil Pelajar Pancasila Kelas IV di UPTD SDN Kraton 1 Bangkalan

The purpose of this research is to determine the suitability of developing project modules at the UPTD SDN Kraton 1 Bangkalan school with guidelines for developing profile projects. Based on Minister of Education and Culture Decree No.262/M/2022, the theme provisions applied at the elementary school level are 2 to 2. 3 different themes in 1 school year. The approach taken in this research is descriptive quantitative research. The data collection used was a questionnaire sheet. The results obtained in this research show that: The school has fulfilled 2 different themes in 1 academic year with module components that are in accordance with the project development guidelines for strengthening the Pancasila student profile. The customized project module components include mapping of themes, dimensions, elements and sub-elements, activity flow, and assessment design based on phase development for class IV, namely phase B. The completeness and suitability of the module obtained 100% results. The results of the researcher's data analysis were agreed upon by 2 observers. From the calculation of the agreement coefficient, the result was 1. A value of 1 > 0.75, if categorized using recapitulation of observation calculations, received a very good category.

공립유치원 교사의 발달단계가 승진욕구와 교사헌신에 미치는 영향에 관한 연구

The purpose of this study is to investigate the effect of the developmental stage of public kindergarten teachers on desire for promotion and teacher commitment. The research method collected 233 copies of data collected from teachers of public kindergartens in Gyeonggi-do and statistically analyzed them through SPSS 29.0 by frequency analysis, reliability coefficient calculation, mean and standard deviation, correlation analysis, and regression analysis. As a result of the study, first, among the sub-factors of the teacher development stage of public kindergartens, growth and maturity were found to be high, desire for promotion were found to be at an intermediate level, and teacher commitment was found to be high. Second, looking at the correlation between the teacher development stage and the promotion desire, promotion orientation, growth, and maturity were positively correlated with the promotion desire, and stability, recession, and frustration were negatively correlated. Looking at the correlation between the teacher development stage and teacher commitment, growth, maturity, and promotion orientation were positively correlated, and frustration and survival were negatively correlated.

Pengaruh Labelisasi Halal dan Harga Terhadap Minat Mahasiswa Pada Produk Roma Malkist

This study aims to empirically examine the effect of halal labeling and price on student interest in roma malkist products in students of the Faculty of Economics and Business UNISNU Jepara. This study used a descriptive quantitative approach. The population of this study amounted to 889 students with samples taken as many as 90 students. The sampling technique used uses the purposive sampling method. The data analysis technique uses multiple linear regression through the SPSS 21 program. The results of this study show that halal labeling has a significant effect on students' interest in roma malkist products. Data analysis showed the calculation of a regression coefficient of 0.002 with a significance level of t of 0.05. Price has a significant effect on students' interest in roma malkist snack products. This is indicated by a significance value of 0.000 < 0.05. The value of the coefficient of determination in this study is 52.9% so it can be concluded that halal labeling and price affect interest.

Implementation of a PAFV turbulence model for airfoil flow simulation on OpenFOAM

To further develop a more effective turbulence model and to improve the calculation accuracy of the flow around airfoil, a new PAFV turbulence model has here been constructed by using a deformation rate tensor and the grouping of an average fluctuation velocity. To evaluate the applicability of the PAFV turbulence model, the numerical calculations of flow around the airfoil have here been implemented, which was based on the OpenFOAM calculation platform. On the basis of grid independence research, the model was used to calculate the low-speed flow-around problem for the plano-convex airfoil NACA4412 and the symmetric airfoil NACA0012. It was also compared with the S-A (Spalart-Allmaras) and SST (Shear Stress Transport) k-ω turbulence models. Firstly, the maximum lift angle-of-attack case of the NACA4412 airfoil was calculated. Thereafter, numerical calculations were performed for the flow around the airfoil in the multi-angle-of-attack case of the NACA0012 airfoil. The results showed that the NACA4412 airfoil had an obviously separated vortex at the trailing edge of the airfoil at the maximum lift angle of attack. Also, there was a certain velocity loss downstream of the trailing edge, which was calculated by all three models. However, the results of the PAFV turbulence model were found to be better than those of the S-A and SST turbulence models. The three turbulence models showed comparable accuracies for the calculations of the surface pressure coefficients of the NACA0012 airfoil. However, the S-A and SST k-ω turbulence models were slightly better for the calculations of the mean velocity profiles of the NACA0012 airfoil. Also, the PAFV turbulence model was more accurate for the calculations of the lift and drag coefficients. In conclusion, the PAFV model can make effective predictions of the airfoil low-speed flow around the problem at hand, which in turn preliminarily verifies the applicability of this turbulence model for the low-speed flow around the airfoil problems.

Calculation of hydrogen adsorption isotherms and Henry coefficients with mixed CO2 and CH4 gases on hydroxylated quartz surface: Implications to hydrogen geo-storage

Hydrogen is a clean fuel that is becoming increasingly popular in addressing future energy challenges, however, its viable storage requires an understanding of its interaction with underground rock minerals. For this purpose, this study focuses on developing adsorption isotherms and Henry coefficients for hydrogen in hydroxylated quartz surfaces, which are predominant in sandstone and shale rocks. In this study, a molecular-scale hydroxylated quartz structure with a pore space is generated and the Monte Carlo (MC) simulation is utilized to assess the adsorption isotherms and Henry coefficients. Initially, the CO2 adsorption with the hydroxylated quartz is matched with the published data to determine the accuracy of MC simulation and the mineral-fluid interaction. After that, the concentration of H2 within the pore is progressively increased and the competitive adsorption is calculated under various subsurface temperature and pressure conditions. Additionally, CH4 is introduced to understand the competitive adsorption dynamics between H2 and CH4. The findings indicate that increasing pressure results in increasing molecules of hydrogen that monotonically increase H2 adsorption. On the contrary, increasing temperature reduces the affinity of hydrogen with the quartz surface causing a decrease in adsorption capacity and Henry coefficients. Furthermore, a weak single hydrogen adsorption layer is developed at all pressure and temperature conditions, while most of the hydrogen remains as a free gas in the pore. In addition, the hydroxyl group controls most of the adsorption of hydrogen in the hydroxylated quartz. Furthermore, the addition of water film (approximately 1 wt%) reduces the hydrogen adsorption by around 3 %. The H2 adsorption values further experience a notable decrease with the introduction of CO2 and CH4, primarily due to the establishment of a strong adsorption layer caused by the high electrostatic attraction between these gases and the quartz mineral. The study offers crucial microscopic details regarding H2 adsorption alongside CO2 and CH4 gases within hydroxylated quartz pores. These insights support efficient hydrogen geo-storage and larger-scale simulation research.

Continental Arc Accumulation Mafic Rocks in the Mid-Upper Crust: Constraints From the Early Eocene Hornblende Gabbro–Diorite in the Tengchong Block, Southeastern Extension of Tibet

Abstract Magmatic activity in the syn-collision stage is key for net crustal growth. To understand the mechanism of accretion–differentiation and compositional change of the continental crust, it is important to focus on the magmatic activity during the syn-collision stage. Early Eocene mafic–ultramafic rock assemblages found in the western part of the Tengchong Block resulted from a continuous series of arc magmatic evolution, thoroughly recording the continental arc magmatic system during the subduction of the Neo-Tethys Ocean and syn-collision of the Indian-Asian continents. Early Eocene hornblende gabbro–diorite in the Tengchong Block formed at 53 Ma, and the primitive magma was derived from an enriched mantle source due to the enriched Nd–Hf isotopes. The amphibole and biotite thermobarometer measurements indicate that the mafic magma reservoirs in the Tengchong Block occurred at a mid-upper crust. Petrography, amphibole Fe/Mg exchange coefficient (KD), Rayleigh fractionation, and equilibrium melt calculation indicate that the Early Eocene hornblende gabbro–diorite in the Tengchong Block was created due to plagioclase-dominated accumulation at the mid-upper crust level. Based on the calculation, the corresponding amphibole equilibrium melt is more silicic (dacitic–rhyolitic in composition) than the bulk rocks, indicating a more evolved composition in the mid-upper crust. Three types of plagioclases reveal the multi-recharging and dissolution–reprecipitation promoting the further evolution of these mafic rocks. Therefore, this study concludes that magma recharge and plagioclase-dominated accumulation processes may be important mechanisms for the formation and evolution of mafic magma and the further crustal differentiation at the mid-upper crust level in a continental margin arc.

Examination of the Attitudes of Individuals Playing Folk Dances Towards Folk Dances

The purpose of this study is to investigate the attitudes of individuals who perform folk dances towards folk dances. 193 people who actively studied and performed folk dances at Alanya Aladdin Keykubat University participated voluntarily in our study. Tekkurşun Demir, Ozbek, and Gündüz (2022) established the validity and reliability of the Attitude Scale Towards Folk Dances (ASTFD), which was used in our study. In accordance with the 95% confidence interval, statistical frequency analysis, reliability coefficient calculations, the Mann Witney U test, and the Kruskal Wallis H test were conducted using the SPSS 25 package program. In the age variable of our research, the average age is close to each other, in the gender variable, women are more than men, graduate students are negative compared to undergraduate students, in the monthly income levels variable, individuals above the minimum wage are positive compared to individuals below the minimum wage, in the folk dance experience variable, individuals who receive 1-2 years of education and actively play folk dance are positive compared to individuals who are 3-4 years and 5 years and above. As a result, it was observed that According to the results of the Man Witney U Test conducted between the ages of the individuals and their Attitudes towards Folk Dances, there was a statistically significant difference in the scale total score and three sub-dimensions (p

Development and Validation of the Bilingual Catalan/Spanish Cross-Cultural Adaptation of the Consensus Auditory-Perceptual Evaluation of Voice.

This study aimed to develop a valid and reliable bilingual version of the Consensus Auditory-Perceptual Evaluation of Voice (CAPE-V) for the auditory-perceptual evaluation of voice in Catalan and Spanish speakers. The development of this CAPE-V adaptation included Delphi methodology with 20 voice and speech experts reaching consensus on the optimal adapted terminology of the perceptual vocal attributes, considering also input from the original instrument authors. The adaptation and validation of vocal tasks followed a sequential validation procedure, with input from phoneticians and speech-language pathologists. Following pilot testing with a large sample of speech-language pathology students, a refined adapted version was empirically tested for validity and reliability. Concurrent validity was assessed by comparing the adapted CAPE-V with the reference Grade, Roughness, Breathiness, Asthenia, Strain scale. Construct validity was assessed through convergent and discriminant validity analysis. Intrarater and interrater reliability were assessed via intraclass correlation coefficient calculations. User experience was evaluated through a questionnaire. Scale properties were validated using a confusion matrix, and cutoff values were calculated to achieve the optimal balance between sensitivity and specificity. Through a formalized consensus process, optimal Catalan/Spanish terminology was determined for the perceptual attributes of voice present in the CAPE-V. An adapted protocol of tasks was obtained that preserves the objectives of the original instrument and the relevance of the phonetic criteria in the target languages. The results demonstrated concurrent validity, construct validity, and intrarater reliability. Interrater reliability was found to depend on the extent to which evaluators shared their internal standards. The raters identified CAPE-V as an effective and preferred instrument. An adapted, validated version of the CAPE-V is made available to clinical professionals for the evaluation of voice in Catalan and Spanish speakers.

Optimization Problems for Assessing the Relative Importance of Elements in the Analytic Hierarchy Process

Analytic hierarchy process (AHP) was proposed by American scientist Thomas Saati. It is a closed logical structure that, with the help of hierarchies, priorities and simple mathematical rules, provides analysis of complex problems in all their diversity. Analytic hierarchy process is successfully used for solving practical problems and quite often leads to optimal answers for planning, forecasting and other problems. It can also be applied to system analysis of the using multimedia factors for increasing the effectiveness of patients’ rehabilitation at various stages of disease.The article proposes two optimization problems for coefficients analysis in the matrix of pairwise comparisons of elements for analytic hierarchy process, with criterion is minimization of the matrix consistency index. The first problem is related to finding integer coefficients in the scale of T. Saati subject to insignificance of components deviations of the vector of priorities of elements rounded to two digits from the given ones. The second problem is related to correction of the specified pairwise comparisons matrix coefficients subject to upper bound on total deviation of the matrix coefficients from the specified ones and subject to deviation of the rounded components of the element priorities vector from the specified components.Calculations of the optimal coefficients in both optimization problems for the example of T. Saati related to study of lighting intensity and the law of the inverse square of the distance to the light source are given. An example of the second optimization problem application for correcting matrix of pairwise comparisons, which was built by a rehabilitation doctor to assess the importance of four elements of the multimedia environment when including them in the rehabilitation program, is considered.The material of the article is presented in three sections. Section 1 describes T. Saati’s example from the study of light intensity and the law of the inverse square of the distance to the light source. Section 2 describes the first optimization problem and provides calculations of the optimal coefficients for the pairwise comparisons matrix for the example of T. Saati. Section 3 describes the second optimization problem and gives examples of its application to bring the already existing pairwise comparisons matrix to the pairwise comparisons matrix with better consistency index both for the experiment of T. Saati and for the analysis of using of multimedia factors for improving efficiency of patients’ rehabilitation.