Regression Formula Research Articles

Dynamic Viscosity Measurement Method Based on the Stokes Drag of Prolate Ellipsoidal Mass

Viscometer plays an important role in the field of tribology. One way to measure viscosity is to use the Stokes drag principle in the underdamped harmonic oscillation phenomenon. This paper proposes a dynamic viscosity measurement method based on the related physical laws. Our experimental model involves a prolate ellipsoidal mass that experiences underdamped harmonic oscillation within viscous liquid samples. We observed the oscillations of the prolate ellipsoid to obtain the viscous damping coefficient of each sample and substituted it to the theoretical formula of dynamic viscosity. Experimental data suggest that the mathematical model has failed to predict the viscosity values of the samples. In addition, the regression curve of the reference viscosity and the measured viscous damping coefficient shows that the two quantities have an exponential relation instead of linear relation as explained in the theoretical model. We considered the regression formula as the empirical measurement transfer function and used it to measure the viscosity of an ISO VG 150 industrial oil sample. This measurement resulted in a 2.40 % of relative error percentage. Lastly, this measurement method is only valid for measuring samples with viscosities ranging from 0.0400 Pa s to 0.256 Pa s.

Application of the Kvaal method to CBCT reconstructed panoramic images for age estimation

As the teeth are more durable than other parts of the skeleton, they provide valuable data for age estimation. Age estimation from adult teeth is mainly based on secondary dentin production. The present study aimed to devise a regression formula for age estimation specific to the Anatolian population using the Kvaal method on CBCT reconstructed panoramic images. In total, 201 individuals aged between 20 and 69 were divided into two groups: data from the study group (n = 101) were used to create the regression formulae, and data from the control group (n = 100) were used to test the formulae. Pearson’s correlation coefficients and linear regression analyses were performed. Maxillary teeth provided more accurate age estimates than mandibular teeth. The regression formulae derived in this study are found to be statistically applicable and reasonably accurate. However, these results should be interpreted with caution.

A planting optimization strategy to improve the carbon sink benefit for urban green-Taking the communal green of Nanjing Forestry University as an example

This research study identified the communal green at Nanjing Forestry University as an example and focused on the carbon sink benefits of the plant communities. Firstly, the representative plant communities in the communal green were investigated, and the parameters of the plant communities were established so that the carbon sink benefits of each plant community could be quantified. Secondly, by applying correlation analysis to study the influence degree of varied plant community factors on the benefits of carbon sink, it was found that the canopy closure, diameter class structure and tree density showed significant positive correlation; the correlation between community density and daily carbon sequestration per unit area was significant; the correlation between community density and carbon storage per unit area showed none significance; and the correlation between the proportion of trees and shrubs and the carbon sink benefits was of no significance. Thirdly, regression analysis was used to study the curve trends of the carbon sink benefits of the plant communities, from which it was concluded that increasing canopy density, average plant height, average crown width and tree density will improve carbon sink benefits. Increasing the average DBH would achieve positive effects for increasing daily carbon sequestration per unit area only at the early stage of the community growth. The plant community density showed positive effects on the increase of the daily carbon sequestration per unit area within a limited range. Since most regression formulas resulted in S-curves, certain threshold bottlenecks were found existed of improving the carbon sinks benefits by increasing the plant community factors. Finally, the characteristics of plant communities with high carbon sink benefit were summarized to provide theoretical references for forming a planting optimization strategy of urban green.

Interstitial lung disease in patients with systemic scleroderma: approaches to predicting lesion volume

Aim. To determine the factors that contribute to the prediction of the volume of pulmonary lesion in patients with systemic scleroderma (SSc).Materials and methods. The analysis included patients with SSc observed in the Registry of Myositis, systemic sclerosis and mixed connective tissue disease (REMISSIS), who underwent high-resolution computed tomography (HRCT) of the lungs. For the immunological characteristic, all patients were tested for anti-topoisomerase (anti-Scl-70), and anti-centromeric (anti-CENP-B) antibodies, and anticentromere antibodies (anti-Pm-Scl).Results. The study included 79 patients with SSc. There was 94.9 % women. Average age – 64.4 ± 11.5 years. Signs of interstitial lung disease (ILD), according to HRCT were detected in 50 patients. The largest extent of lung injury was noted in patients with SSc sine scleroderma (32.7 ± 29.3 %), a smaller extent in patients with diffuse form SSc (16.9 ± 17.1 %) and the lowest in patients with limited SSc (8.5 ± 14.2 %). In addition to the type of disease, the extent of lung injury in patients with SSc-ILD was statistically significantly higher in patients with arthralgia, dyspnea and the presence of antibodies to topoisomerase I and combined autoantibodies. Also, a statistically significant feedback was established with all indicators of the test with a 6-minute walk and forced vital capacity and a direct relationship with indicators of pulmonary artery systolic pressure. When evaluating the correlation between the extent of lung injury and the degree of dyspnea according to Borg, it was found that in patients who assessed dyspnea less than 3 points, the extent of lung injury was less than 25 %. Due to the high degree of correlation, a regression formula was created for the dependence of the extent of lung injury on the distance in the test with a 6-minute walk: extent of lung injury = (52.7–0.1) × distance 6MWT. A multivariate model was also obtained for predicting the extent of lung injury in SSc, in which the patient’s immunotype, distance in the 6-minute walk test, saturation after the 6-minute walk test, and the presence of dyspnea became the most effective.

The Effect of Human Resources Development on the Work Effectiveness of Employees of the Muara Enim Regency Cooperative, Small and Medium Enterprises Office

This study aims to find out and analyze whether there is an influence of human resource development on the work effectiveness of employees of the Office of Cooperatives, Small and Medium Enterprises of Muara Enim Regency and to find out and analyze whether there is a positive and significant relationship between human resource development and work effectiveness of employees of the Office of Cooperatives , Small and Medium Enterprises Muara Enim Regency. The sample in this study were all employees of the Office of Cooperatives, Small and Medium Enterprises, Muara Enim Regency, totaling 32 people. So the sampling technique used in this study using saturated sampling method. Sampling is saturated, namely the technique of determining the sample if all members of the population will be sampled in research or can also be called a census in a small scope. The research method used in this study is a quantitative method using questionnaires distributed to respondents. Data analysis techniques using validity test, reliability test, normality test. The analysis used was descriptive analysis and inferential analysis using statistical calculations with a simple linear regression formula, coefficient of Cooperatives, Small and Medium Enterprises of Muara Enim Regency. The results of the analysis show that human resource development has a fairly strong contribution to the work effectiveness of the employees of the Office of Cooperatives, Small and Medium Enterprises, Muara Enim Regency.

Mathematical modeling of optimal coagulant dosage for tofu preparation using MgCl2

To explore the association between the optimal coagulant for tofu and the components of soybeans,30 different kinds of soybeans were selected, and tested for their optimal coagulant MgCl2 content. The optimal amount of coagulant was taken as the dependent variable, and the soybean Composition were taken as independent variables for the correlation analysis. The results showed that there was a positive correlation between the optimal coagulant content and the content of histidine, 7S β-conglycinin, B1aB1bB2B3B4 of 11 s glycincin, and α'-subunit of 7S β-conglycinin, negative correlation with lysine. The regression formula is y = -1.186 + 3.457*B1aB1bB2B3B4 + 2.304*7S + 0.351*histidine − 0.084*lysine + 4.696*α', and the model is validated to be within 10 % of the error value and has a high degree of confidence. This study provides theoretical support for realizing the green production of traditional soybean products.

Estimation of cadaveric age in crime scenes using Raman spectroscopy

The number of unidentified corpses has been increasing in recent years. There is a need for an objective and readily applicable method to estimate age, which is important information for identification. In previous reports, we reported that the protein folding ratio (RPF) of skin, as measured by Raman spectroscopy using cross sections of skin samples, is highly correlated with age. In this study, we investigated the possibility of estimating age by measuring Raman spectra from the skin surface of cadavers using a portable device.The resultant intercept, slope, and root mean square error were 97.9, – 63.7 (p < 0.0001), and 11.68, respectively. We evaluated this regression formula by using 10-fold cross-validation, resulting in a coefficient of determination of 0.51. The portable Raman spectrometer may be of assistance in estimating age at death of corpses at the scene of discovery.

Stature from Tibia Irrespective of Sex: A Cross-Sectional Study

Mutilated human remains are recovered many times and may be the only evidence of crime. Establishing the identity of the victim is of primary importance and stature assumes a prominent feature in the identification parameters. In view of this, we have taken up the present study to on Indigenous Manipuri Meitei subjects, both males and females, in the age group of 21-25 years. This is a cross-sectional study comparing the standing height of the participants with the percutaneous tibial length. The degree of correlation has been analysed and a regression formula has been estableshed irrespective of sex, i.e., which can be used on any specimen, whether male or female. Atotal of 75 males and 75 females were studied in Department of Forensic Medicine and Toxicology, of a tertiary health care centre in north east India. Subjects with any obvious congenital or acquired deformity of spine or extremities was not included in the study. Aregression equation is established based on the tibial length of the individual, irrespective of sex has been derived as, Y= 81.90 +.85 X3 + 4.11. The equation so developed is tested by F-test and found to be very highly significant (P=&lt;.001). In other words, the developed equation is treated as best fit to the present data and henceforth it may be used to detect the stature of person too for any given value of his/her tibial length.

Regression models for calculating state-to-state coefficients of the rate of vibrational energy exchanges

The paper proposes an effective algorithm for solving problems of nonequilibrium gas dynamics taking into account detailed state-to-state vibrational kinetics. One of the problems of traditional methods is their high computational complexity, which requires a lot of time and memory. The work explored the possibilities of using relaxation rate prediction to improve the performance of numerical simulations of nonequilibrium oxygen flows instead of direct calculations. For this purpose, an approach based on nonlinear regression analysis was used, which made it possible to obtain computationally efficient approximation formulas for the energy exchange rate coefficients in the model of a forced harmonic oscillator, taking into account free rotations (FHO-FR), to significantly increase the calculation speed while maintaining accuracy, and to construct an optimized model FHO-FR-reg. Using the obtained regression formulas, numerical modeling was carried out, which made it possible to validate the model for the problem of oxygen flow behind an incident and reflected shock wave. A comparison between the forced harmonic oscillator (FHO) and FHO-FR models is not possible due to the high computational complexity of the second model. With the advent of a common approximation model, it became possible to compare simulation results for these models. Numerical calculations have shown that the FHO-FR-reg model gives values of gas-dynamic parameters close to the FHO model. The developed regression models make it possible to speed up the solution of the problem of modeling oxygen relaxation several times compared to other models of similar accuracy.

Pengembangan Bahan Ajar Fikih Berbasis Padlet dalam Meningkatkan Motivasi Belajar Siswa di MTs Al-Azhar Pamekasan

Learning materials are the key to the success of the learning process. The development of learning materials is carried out by taking into account the characteristics and conditions of the learners, as well as their relevance to the development of the times. The use of technology has also been integrated to create up-to-date learning. However, the gap in access to technology between urban and rural areas still needs attention. Therefore, the purpose of this study is to test the development of Padlet-based Fiqh learning materials to improve student motivation in MTs Al-Azhar Pamekasan. This study uses the R&amp;D method through the development of Padlet-based Fiqh learning materials with the ASSURE model. It also uses the linear regression formula to ensure the influence of learning material development on the motivation of Grade 8 students at MTs Al-Azhar.The findings of the study prove that the development of Padlet-based Fiqh learning materials is very effective in attracting interest and livening up the learning atmosphere in the classroom. Through regression analysis testing, the development of this fiqh learning material is also able to increase student motivation from various aspects.

Clinical History Method versus Corneal Tomographers in Estimating Corneal Power after.

To investigate the concordance between the corneal power determined by various approaches with two tomographers (MS-39® and Galilei G6®) and the clinical history method (CHM) in patients undergoing photorefractive surgery with excimer laser for myopic errors. Prospective cohort study. Patients undergoing keratorefractive surgery, and having pre- and postoperative keratometries, and tomographies, were included. In 90 eyes, the differences in the power estimated by the CHM and the one determined by four approaches with the corneal tomographers, which included measurements of the posterior cornea, did not show statistically significant differences in their averages. However, the 95% limits of agreement were very wide. After obtaining regression formulas to adjust the values of these four variables, the results of the agreement analysis were similar. Although certain values either directly determined or derived from measurements with the Galilei® and MS-39®corneal tomographers, approximated the estimated value of postoperative corneal power according to the CHM, due to the amplitude of their limits of agreement, these calculations must be taken with care, because they may not be accurate in a given eye.

The influence of organizational characteristics, task division, job satisfaction and employee behavior on the work performance of employees of the regional revenue agency of muara enim district.

The research method used in this research is a quantitative method using questionnaires distributed to respondents. Test data quality using validity tests, reliability tests, normality tests. The analysis used is descriptive analysis and inferential analysis using statistical calculations with multiple regression formulas, partial simultaneous tests and coefficient of determination. Organizational characteristics have a significant effect on the work performance of Muara Enim Regency Regional Revenue Agency employees. The division of tasks has a significant effect on the work performance of Muara Enim Regency Regional Revenue Agency employees. Job satisfaction has a significant effect on the work performance of Muara Enim Regency Regional Revenue Agency employees. Employee behavior has a significant effect on the work performance of Muara Enim Regency Regional Revenue Agency employees. Organizational Characteristics, Division of Tasks, Job Satisfaction and Employee Behavior together have a significant effect on the work performance of Muara Enim Regency Regional Revenue Agency employees.

Non-Invasive Quantitative Approximation of Intracranial Pressure in Pediatric Idiopathic Intracranial Hypertension Based on Point-of-Care Ultrasound of the Optic Nerve Sheath Diameter.

To investigate whether ultrasound-based optic nerve sheath diameter (US-ONSD) is a reliable measure to follow up children with idiopathic intracranial hypertension (IIH). In addition, to analyze the inter- and intra-individual relationships between US-ONSD and intracranial pressure (ICP), and to investigate whether an individualized mathematical regression equation obtained from two paired US-ONSD/ICP values can be used to approximate ICP from US-ONSD values. 159 US examinations and 53 invasive ICP measures via lumbar puncture (LP) were performed in 28 children with IIH. US-ONSD was measured using a 12 Mhz linear transducer and compared to ICP values. In 15 children, a minimum of 2 paired US-ONSD/ICP determinations were performed, and repeated-measures correlation (rmcorr) and intra-individual correlations were analyzed. The cohort correlation between US-ONSD and ICP was moderate (r = 0.504, p < 0.01). Rmcorr (r = 0.91, p < 0.01) and intra-individual correlations (r = 0.956-1) of US-ONSD and ICP were excellent. A mathematical regression equation can be calculated from two paired US-ONSD/ICP values and applied to the individual patient to approximate ICP from US-ONSD. Related to excellent intra-individual correlations between US-ONSD and ICP, an individualized regression formula, created from two pairs of US-ONSD/ICP values, may be used to directly approximate ICP based on US-ONSD values. Hence, US-ONSD may become a non-invasive and reliable measure to control treatment efficacy in pediatric IIH.

The Effect of Using Wordwall Game Application Media on Economics Subjects on Student Learning Outcomes at SMA Negeri 2 Sanga Desa

In this study, the problems found in the field are that the teaching and learning process is not optimal because students experience a form of learning difficulties related to characteristic, personality and study habits or students who excel below their ability level (wordwaall game). By applying synectic learning media, it is expected to overcome or at least direct adjustments to the problems faced by students. This study aims to determine the learning interest of grade XI IPS 1 students in economic growth and development at SMA Negeri 2 Sanga Desa. The method used in this study is the experimental method. Based on the results of the study, the results of the student wordwall game test showed that the average student who experienced it was 85.66% in the experimental class. In the synectic model category, the average student activity is 46.66% and in the experimental class learning outcomes students have an average Student activeness is 46.66%. The overall increase that occurred in students after applying wordwall game media synectic learning in the experimental class had an average of 85.66% or in the creteria "Improving / influential". In the results of the hypothesis carried out by researchers using a simple regression formula, this study there is an influence of wordwall games on the interest of high school students in economics subjects at SMA Negeri 2 Sanga Desa on the material of economic growth and development obtained t_(count =) 7.277&gt;t_(table=)1.697 which means Ha is accepted while Ho is rejected. This study has an influence on other factors. Thus, this study shows that there is an influence of wordwall games on high school students' interest in economics subjects at SMA Negeri 2 Sanga Desa.

The Influence Of Work Attitude, Emotional Intelligence, Work Productivity And Work Motivation On The Effectiveness Of The Work Of Employees Of The Regional Revenue Agency Of Muara Enim Regency

This study aims to determine and analyze the effect of work attitude, emotional intelligence, work productivity and work motivation on the work effectiveness of employees of the Muara Enim Regional Revenue Agency. The research method used in this study is a quantitative method using questionnaires distributed to respondents. Test the quality of the data by using the validity test, reliability test, normality test. The analysis used is descriptive analysis and inferential analysis using statistical calculations with multiple regression formulas, partial tests and coefficient of determination. The results of the study showed that work attitude has a significant effect on the work effectiveness of employees of the Muara Enim Regency Regional Revenue Agency. Emotional intelligence has a significant effect on the effectiveness of the work of employees of the Muara Enim Regency Regional Revenue Agency. Work productivity has a significant effect on the work effectiveness of Muara Enim Regency Regional Revenue Agency employees. Work motivation has a significant effect on the work effectiveness of employees of the Muara Enim District Revenue Agency.

THE INFLUENCE OF WORK MOTIVATION AND DISCIPLINE ON THE PERFORMANCE OF CIVIL SERVANTS IN THE PASER DISTRICT TRANSPORTATION SERVICE

This research aims to analyze the influence of motivation and work discipline on the performance of Civil Servants (PNS) in the Paser Regency Transportation Service. Data was obtained from 67 civil servant respondents via questionnaires, and multiple regression analysis using SPSS 20 was carried out. The results of the analysis show that there is a positive relationship between motivation (X1) and work discipline (X2) and civil servant performance (Y), with the regression formula Y = 0.490 + 0.560X1 + 0.289X2. The coefficient of determination (R2) is 51.9%, indicating the contribution of motivation and work discipline variables to civil servant performance, while 48.1% is influenced by other factors. The F test shows the significance of the relationship together, with H0 rejected. Partially, motivation (X1) and work discipline (X2) each have a significant effect on civil servant performance. Motivation (X1) is the dominant variable with the largest t-count value (4.374). Thus, the hypothesis that motivation (X1) partially has a dominant influence on the performance of civil servants in the Paser Regency Transportation Service can be accepted based on the results of this research.

Risk Stratification of QTc Prolongation in Critically Ill Patients Receiving Antipsychotics for the Management of Delirium Symptoms.

Patients experiencing significant agitation or perceptual disturbances related to delirium in an intensive care setting may benefit from short-term treatment with an antipsychotic medication. Some antipsychotic medications may prolong the QTc interval, which increases the risk of potentially fatal ventricular arrhythmias. In this targeted review, we describe the evidence regarding the relationships between antipsychotic medications and QTc prolongation and practical methods for monitoring the QTc interval and mitigating arrhythmia risk. Searches of PubMed and Cochrane Library were performed to identify studies, published before February 2023, investigating the relationships between antipsychotic medications and QTc prolongation or arrhythmias. Most antipsychotic medications commonly used for the management of delirium symptoms (eg, intravenous haloperidol, olanzapine, quetiapine) cause a moderate degree of QTc prolongation. Among other antipsychotics, those most likely to cause QTc prolongation are iloperidone and ziprasidone, while aripiprazole and lurasidone appear to have minimal risk for QTc prolongation. Genetic vulnerabilities, female sex, older age, pre-existing cardiovascular disease, electrolyte abnormalities, and non-psychiatric medications also increase the risk of QTc prolongation. For individuals at risk of QTc prolongation, it is essential to measure the QTc interval accurately and consistently and consider medication adjustments if needed. Antipsychotic medications are one of many risk factors for QTc prolongation. When managing agitation related to delirium, it is imperative to assess an individual patient's risk for QTc prolongation and to choose a medication and monitoring strategy commensurate to the risks. In intensive care settings, we recommend regular ECG monitoring, using a linear regression formula to correct for heart rate. If substantial QTc prolongation (eg, QTc > 500 msec) is present, a change in pharmacologic treatment can be considered, though a particular medication may still be warranted if the risks of discontinuation (eg, extreme agitation, removal of invasive monitoring devices) outweigh the risks of arrhythmias. This review aims to summarize the current literature on relationships between antipsychotic medications and QTc prolongation and to make practical clinical recommendations towards the approach of antipsychotic medication use for the management of delirium-related agitation and perceptual disturbances in intensive care settings.

A Job satisfaction and work environment with happiness among Indonesian police personnel

This study aimed to determine the relationship between job satisfaction, work environment, and personnel happiness. The method used is quantitative descriptive correlative type, which takes samples using proportional random sampling totaling 109 people. In collecting data, it used instruments of job satisfaction, work environment, and personnel happiness, then tested it with multiple linear regression formulas. The results of the research data analysis show there is a relationship between job satisfaction and personnel happiness. There is a relationship between the work environment and personnel happiness, and there is a relationship between job satisfaction and the work environment with personnel happiness. Seeing the relationship between job satisfaction and work environment with personnel happiness, it is hoped that the leadership of Tebing Tinggi Police Station will pay attention to providing increased awareness that supports the creation of happiness in personnel members. These theoretical findings can be used to develop empirical quantitative research in psychology.

Impaired Aortic Growth in Neuroblastoma Patients After Intensive Treatment

PurposeThis study evaluated the abdominal aortic diameter in high-risk neuroblastoma (NB) patients and the risk of aortic narrowing following intensive treatment. MethodsWe measured the aortic diameter at four specific levels of the abdominal aorta (diaphragmatic crus, celiac axis, and the root of the superior (SMA) and inferior (IMA) mesenteric arteries) on contrast CT scans. The control group consisted of 56 children with non-oncologic disorders, while the NB group included 35 patients with high-risk abdominal NB. We used regression analysis of age and aortic diameter to determine the regression formula for each level in each group and performed intergroup comparisons using t-test. ResultsWe evaluated a total of 160 contrast-enhanced CTs performed in the 35 eligible cases. The aortic diameter of pretreated NB patients was not significantly different from the controls. After receiving any treatment, the aortic diameter was significantly smaller in the NB group (p < 0.01 each). Patients who underwent radical surgery, particularly gross total resection (n = 26), had smaller aortic diameters at all levels compared to controls (p < 0.01 each). Patients treated with radiotherapy (RT) had smaller aortic diameters than controls. External beam radiotherapy (EBRT) patients (n = 24) had smaller aortic diameters at all levels except the celiac axis (crus, SMA, IMA; p < 0.01 each), and intraoperative radiotherapy (IORT) ± EBRT patients (n = 5) had smaller aortic diameters at all levels (p < 0.01 each). ConclusionPatients with NB may experience impaired development of the abdominal aorta after multimodal therapy, particularly after RT. Close observation and long-term follow-up is essential to monitor for catastrophic vascular complications. Level of EvidenceLEVEL III.

Long-Term Behaviour in an Exactly Solvable Model of Pure Decoherence and the Problem of Markovian Embedding

We consider a well-known, exactly solvable model of an open quantum system with pure decoherence. The aim of this paper is twofold. Firstly, decoherence is a property of open quantum systems important for both quantum technologies and the fundamental question of the quantum–classical transition. It is worth studying how the long-term rate of decoherence depends on the spectral density characterising the system–bath interaction in this exactly solvable model. Secondly, we address a more general problem of the Markovian embedding of non-Markovian open system dynamics. It is often assumed that a non-Markovian open quantum system can be embedded into a larger Markovian system. However, we show that such embedding is possible only for Ohmic spectral densities (for the case of a positive bath temperature) and is impossible for both sub- and super-Ohmic spectral densities. On the other hand, for Ohmic spectral densities, an asymptotic large-time Markovianity (in terms of the quantum regression formula) takes place.