Walton Model Research Articles

Using seismic petrophysical modeling and prestack simultaneous inversion to provide insights into the physical properties of uranium-bearing reservoirs: Implications for favorable sites of sandstone-hosted uranium deposits

Seismic prospecting has been accepted as one of the most widely available methods for exploring sandstone-hosted uranium deposits (SUDs). However, conventional seismic interpretation faces a challenge in the identification and characterization of a uranium reservoir’s complexity. How to characterize in detail a uranium reservoir’s physical complexity and effectively improve uranium reservoir prediction accuracy remain unresolved problems. To address this, we develop a novel combination of petrophysical modeling and prestack simultaneous inversion to understand in detail the physical properties of uranium-bearing reservoirs and efficiently predict favorable SUD sites. First, we develop a workflow of rock-physics modeling for SUD logs using the Xu-White method to calculate the modulus of elasticity of the grain matrix; subsequently, we extend the Walton model for the modulus prediction of the dry rocks and the Gassmann equation for one of the saturated rocks after a massive calculation test; and then, we predict the S-wave data used for the following inversion. Second, we execute a prestack simultaneous inversion to obtain the petrophysical parameters (e.g., P-impedance, density [[Formula: see text]], shear modulus [[Formula: see text]], Lamé coefficient [[Formula: see text]], and Young’s modulus) that can provide insights into the physical properties of a uranium metallogenic environment. Accordingly, we discover that sites bearing uranium mineralization strongly correspond to areas with low elastic-parameter values (especially [Formula: see text] and [Formula: see text]), whereas nonuranium anomalies occur in high-value sites. This indicates that weakened elastic characteristics are caused by the enhancement of the total organic content and total clay mineral volumes of the uranium-bearing layers. In summary, the developed combination approach can yield an effective and accurate characterization of the geologic properties of uranium-bearing formations, and it can provide prediction factors (e.g., parameters related to the shear modulus) for uranium mineralization.

Quality of Life at Work: A Qualitative Analysis of The Sustainable Logistics Management Plans of Brazilian Federal Institutes

Purpose: This study analyzed the initiatives linked to Quality of Life at Work (QWL) in implementing the Sustainable Logistics Management Plan of the Brazilian Federal Institutes (IFs). Theoretical background: As a theoretical basis, we used the dimensions of QWL proposed in the model developed by Walton (1973), which analyzes QWL based on factors influencing employees' lives in organizations. Methodology: With a qualitative approach, the research selected twelve logistics plans from FIs in the five Brazilian regions, whose analysis was based on the dimensions of Walton's model (1973) and content analysis (Bardin, 1977). Results and conclusion: The notable results were that the dimension of the opportunity to use and develop capabilities was less prominent in the FIs' plans. In the plans of the FIs, the ones that presented actions were the Federal Institute of Sul de Minas, Pará, and Catarina. de Minas, Pará and, Catarinense. Another dimension that needs to be in the plans is opportunity for growth and security. The institutes of Sertão Pernambucano, Pará, Norte de Minas, Sul de Minas, and Rio Grande do Sul showed initiatives, and Rio Grande do Sul showed initiatives such as the promotion of training courses and qualification courses for staff and the provision of training. Research implications: The analysis and categorization of QWL actions contribute as a measurement tool for both public and private organizations. Originality/value: The use of the model opens up ways of using the instrument in the preparation and structuring of QWL actions in the PLs with the aim of reaching the most diverse areas of QWL This study analyzed the initiatives linked to Quality of Life at Work (QWL) in implementing the Sustainable Logistics Management Plan of the Brazilian Federal Institutes (IFs). As a theoretical basis, we used the dimensions of QWL proposed in the model developed by Walton (1973), which analyzes QWL based on factors influencing employees' lives in organizations. With a qualitative approach, the research selected twelve logistics plans from FIs in the five Brazilian regions, whose analysis was based on the dimensions of Walton's model (1973). The notable results were that the dimension of the opportunity to use and develop capabilities was less prominent in the FIs' plans. In the plans of the FIs, the ones that presented actions were the Federal Institute of Sul de Minas, Pará, and Catarina. de Minas, Pará and, Catarinense. Another dimension that needs to be in the plans is opportunity for growth and security. The institutes of Sertão Pernambucano, Pará, Norte de Minas, Sul de Minas, and Rio Grande do Sul showed initiatives, and Rio Grande do Sul showed initiatives such as the promotion of training courses and qualification courses for staff and the provision of training. The main results show that all the FIs whose PLSs were studied presented actions focused on safe and healthy working conditions. On the other hand, other dimensions need to be explored further.

Elderly Public Servants: Assessment of their satisfaction with Quality of Life at Work

This work aims to test the Walton Model based on the perception of quality of life (QWL) of elderly employees of the state government of Amazonas. Furthermore, the model's predictive capacity to explain the satisfaction of public servants with QWL will also be analyzed. This research presents a quantitative approach in which the questionnaire represents the eight dimensions of Walton's model. Data collection occurred electronically by sending the Google Forms link to all state elderly servers. Data were analyzed using structural equation modeling. The results show that the dimensions of the Walton Model that most impact the overall QWL perceived by state government employees are balance, work relevance, and professional growth, respectively. On the other hand, social integration negatively impacts general QWL. Furthermore, it was found that the Walton Model can explain more than 73% of the overall QWL. The main theoretical contributions of this work fall on the test of the nomological validity of Walton's model, on the study that addresses elderly public servants who are little studied and presents specific and pertinent considerations on the support and rejection of the hypotheses that represent the eight dimensions of the Walton model.

Spanish Version of a Scale to Evaluate the Quality of Work Life in Teachers: An Adaptation of Walton's QWL Model in the Peruvian Context.

Workers' job satisfaction benefits the organization, which constitutes a competitive advantage. This is why the Quality of Work Life (QoWL) study has gained relevance in recent years. For this reason, various scales have been developed to evaluate this organizational variable constantly. However, to date, there is no evidence in the scientific literature of a Spanish version that evaluates the validity and reliability of these scales in a Peruvian context. Thus, this study aimed to translate into Spanish and adapt and analyze the validity and reliability of a scale to assess the quality of work life in Peruvian teachers based on Walton's model. For this purpose, 457 regular basic education teachers from a private educational network located in the three regions of Peru were surveyed. The analyses used the Structural Equation Model (SEM) with the AMOS 24 statistical software. Confirmatory Factor Analysis provided an excellent fit model of eight factors and 31 elements (CMIN/DF = 2.351; CFI = 0.955; SRMR = 0.062; RMSEA = 0.054; Pclose = 0.052). It also demonstrated good internal consistency (α = between 0.806 and 0.938; CR = between 0.824 and 0.939; AVE = between 0.547 and 0.794). These results contribute to the study of QoWL in Peru.

Quality of life and work engagement among nursing staff at the start of the COVID-19 pandemic.

This article investigates the correlation between work engagement and work-related quality of life among nursing staff at a public hospital in São Paulo State, at the onset of the COVID-19 pandemic. A descriptive, correlational, cross-sectional study of nursing personnel was conducted from December 2020 to January 2021, using the Brazilian versions of the Work & Well-being Survey (Utrecht Work Engagement Scale - UWES) and the Work-related Quality of Life (WRQoL) scale, following Walton's model. Nursing staffs returned a strong positive correlation (r≥0.70) between the social integration domain of the WRQoL and the vigour dimension of the UWES (r=0.88; p=<0.001); a moderate positive correlation (r≥0.40≤0.69) between working conditions (WRQOL) and the vigour (r=0.40; p<0.001), dedication (r=0.40; p<0.001) and overall score (r=0.41; p<0.001) dimensions of the UWES. Correlations were positive and weak (r≤0.39) for the other WRQoL domains and the UWES dimensions. It was concluded that personnel with satisfactory levels of quality of life tend to show higher levels of engagement at work. At the onset of the COVID-19 pandemic, nursing professionals were strongly engaged and satisfied with their work-related quality of life.

Impact of Quality of Work-life on Employee Productivity in Divisional Secretariats of The North-Western Province of Sri Lanka

Public sector organizations in Sri Lanka are running through public funds, and it is vital to use those funds in an impactive manner. To measure whether public organizations are running effectively, productivity is an important concept to study. Previous scholars have analyzed and identified an ideaof work-life quality related to employee productivity. The majority of early researchers found a relationship between quality of work-life and employee productivity, but they do not focus on measuringthe impact of quality of work-life on employee productivity. This study fills the said gap by investigating the effects of quality of work-life on employee productivity. Employee productivity was measured using ACHIEVE model, and quality of work-life was measured using the Walton model. In the Walton model, there are eight quality indicators of work-life working conditions, social integration, adequate and fair compensation, occupied space by work in life, use of capacities at work, social relevance, opportunities at work, and constitutionalism. The population of this study was all employees working in divisional secretariat offices in Northwestern province; thesample size was 375 and useda random sampling technique. This research was a basic type of explanatory research, and primary data was used. Data were collected from employees covering all sections of divisional secretariats in the northwestern province. The result of this study indicated that there is a positive relationship between quality of work-life and employee productivity. At the same time, quality of work-life has a significant impact on employee productivity. Of eight indicators of quality of work-life, only four have influenced employee productivity. They are social integration, constitutionalism, social relevance, and occupied space by work. Concern about providing formal and informal integration among employees, freedom of expression, fair treatment,, and focus on social responsibility in divisional secretariat offices are vital aspects of employee productivity.

Determining the relationship between girl students’ quality of school life and teachers’ quality of work life

The purpose of this study is to determine the relationship between the quality of life of school students and the quality of work life of high school teachers in Eslamshahr. The research method is descriptive–correlational and its statistical population includes all high school teachers and students of second grade in Eslamshahr city. The sample size was calculated based on the Cochran formula with 5% error levels for 339 teachers and 363 for students. The data collection tools in this study are as follows: Walton Model of Quality of Work Life and Knowledge of School Quality of Life Questionnaires. The analysis of the research data was conducted in two parts: inferential statistics and inferential statistics with SPSS software. The results showed that all the components of the quality of school life of students had a positive and significant relationship with the dimensions of teachers’ quality of work life with p≥0.05. Keywords: Quality of life, quality of work life, quality of school life.

Qualidade de vida no trabalho: uma análise sobre a percepção dos colaboradores da cooperativa Camnpal

Este estudo teve o objetivo de identificar junto aos colaboradores da Cooperativa Camnpal, como avaliam sua Qualidade de Vida no Trabalho. É uma pesquisa aplicada, com abordagem quantitativa, quanto aos objetivos é exploratória, descritiva e uma pesquisa de campo. A coleta de dados ocorreu através de um questionário com 30 questões tendo em vista as oito categorias do modelo de Walton (1973). Os resultados mostraram que os funcionários estão satisfeitos em relação à relevância social da vida no trabalho, constitucionalismo, oportunidades de crescimento e segurança, Somente o uso e desenvolvimento das capacidades e as condições de trabalho, necessitam de melhorias.

QUALITY OF LIFE AT WORK AND OCCUPATIONAL STRESS OF NURSING IN AN EMERGENCY CARE UNIT

ABSTRACT Objective: to evaluate and relate quality of life at work and occupational stress in the nursing team in the Emergency Care Unit. Method: a cross-sectional, correlational study conducted with 109 nursing workers working in the Emergency Care Unit of Minas Gerais, Brazil. A questionnaire with demographic and labor profile was used; the occupational stress was verified by the Job Stress Scale, and the quality of life at work by the Walton model. Results: Among the 109 workers, 34.9% were nurses, 53.2% nursing technicians and 11.9% nursing assistants. In analyzing the Job Stress Scale, 14.7% characterize work with high demand, 8.3% active work, 40.4% passive work and 36.7% work with low demand. In assessing quality of life at work, 39.5% are dissatisfied and 60.5% satisfied. The factors associated with dissatisfaction with work, according to the global scale quality of life at work, were female gender, nurse, low support at work, high demand or active work and longer time in the position held. Conclusion: it was found that most nursing workers in the Emergency Care Unit are satisfied with their quality of life at work and exposed to moderately occupational stress, and those most exposed to this stress were dissatisfied with their quality of life at work.

An Investigation of Factors Affecting the Employees' Quality of Work Life and Assessment of the Status of These Factors

The present study investigated the factors affecting the quality of work life of employees and assessed the status of these components in Mazandaran Gas Company. The population of this study included the employees of this company, and statistical sample involved 329 employees. Walton model was used to study the quality of work life components. To analyze data, test research hypotheses, and assess the status of components, the Chi-square test, Wilcoxon, Friedman, and confirmatory factor analysis were used. The results revealed that fair and appropriate compensation, providing opportunities for continued growth and safety, social relevance of work life, and development of human capacities were at a good status, and healthy and safe environment as well as social cohesion and integration were at an average status, and total space of life and constitutionalism were at an adverse status.

Qualidade de Vida no Trabalho: o caso dos agentes penitenciários em um Centro de Detenção Provisória do Rio Grande do Norte

Os agentes penitenciários, devido a natureza da sua profissão, estão sujeitos a vários fatores de riscos, tensão, desgaste físico e mental. Esse estudo trata-se de uma pesquisa realizada em um Centro de Detenção Provisória (CDP) do Rio Grande do Norte (RN), com o objetivo de analisar a Qualidade de Vida no Trabalho (QVT), tal como percebida pelos agentes penitenciários, segundo o modelo de Walton (1973). O método adotado foi uma pesquisa de campo, de caráter exploratória e descritiva onde foram coletados os dados através de um questionário com perguntas estruturadas e fechadas. Aliado a "Escala de avaliação da qualidade de vida no trabalho" de acordo com o modelo de Walton, adaptada e proposta por Timossi et al (2009). A população-alvo foram os agentes penitenciários servidores de um CDP do RN. Para esta coleta, foram adotados os cuidados éticos, através da carta de anuência da instituição e termo de consentimento dos participantes. Os pressupostos teóricos desse trabalho, se baseiam nos estudos de Walton (1973) que pode ser considerado um dos precursores de uma abordagem científica de QVT. Para Walton, a QVT depende estreitamente do equilíbrio entre trabalho e outras esferas da vida, do papel social da organização e da importância de se conciliar produtividade com QVT. Na análise dos resultados constatou-se uma divisão por partes dos participantes da pesquisa, na qual dentre as dimensões consideradas satisfatórias, temos: o uso e desenvolvimento de capacidades; a integração social na organização e o constitucionalismo. Por outro lado houve insatisfação em relação a compensação justa e adequada; condições de trabalho; oportunidade de crescimento e segurança e a relevância social da vida no trabalho. Observa-se que a QVT é afetada pela subjetividade da percepção que cada pessoa possui em relação a cada dimensão apresentada sobre suas aspirações pessoais e profissionais diante dos objetivos organizacionais. Sugerem-se algumas ações para a melhoria da percepção da QVT no trabalho, como a implantação de um Plano de cargos, carreira e salários e a melhoraria do ambiente físico e da segurança dos trabalhadores.

Inverting Dynamic Elastic Moduli of a Granular Pack to Get Shear Modulus of the Grain

Elastic moduli of rocks derived from its powder is a new concept and can be applied in practical geophysics studies. To develop this concept, we make ultrasonic velocity measurement on granular packs of quartz sand. We calculate dynamic elastic moduli from that measurement and invert afterwards to find the shear modulus of quartz. The inversion technique follows Extended Walton Model that relies on the grain’s contact surface condition between infinitely rough and perfectly smooth. We use different coordination numbers from previous studies (for different samples) in the process of forward modelling and inversion. Forward models have good match with the laboratory measurements both in bulk and shear moduli of the granular pack. Our overall inverted results for the shear modulus are stable and close to actual shear modulus of quartz. However, the coordination numbers that has better match in forward modelling a little bit overestimates shear modulus. On the contrary, the coordination numbers that predicts the higher effective moduli of the pack is giving closest result. As the experiment set up and procedure are simple and robust, this technique can be extended and run in very rigorous situation such as at hard rock drilling rig site to get the elastic properties of the penetrated rocks in real time, where the effective elastic moduli of a grain can be represented as a statistical averaging of elastic moduli of hard rock minerals. This information can be helpful for planning and monitoring the ongoing drilling procedure. It can also be a replacement of solid cores that are missing or damaged for elasticity study.

A study on the effect of teleworking on quality of work life

Article history: Received December 2, 2013 Accepted February 20, 2014 Available online May 21 2014 Nowadays teleworking has become a useful technique for business development and improving employees’ quality of life. Many people are now able to stay at home and do their daily job activities without bothering to wear formal closes. This paper presents an empirical investigation to study the effect of teleworking on quality of life using Walton (1976) method [Walton, R. E. (1973). Quality of working life-what is it. Sloan Management Review, 15(1), 1121.]. The variables of quality of working-life according to Walton Model are: “Adequate and fair compensation”, “Safe and Healthy Working conditions”, “Opportunity for Continued Growth and Security”, “The Social Relevance of Work Life”, “Total Life Space”, “Social Integration in the Work”, “Constitutionalism in the work Organization”, “Human Progress Capabilities”. Using different statistical tests, the study indicate that teleworking had significant positive relationship with Quality of Working-Life components. The study also reports that different personal characteristics such as age, gender had no meaningful impact on teleworking. © 2014 Growing Science Ltd. All rights reserved.

Extended Walton third-order elastic coefficients modified by an anisotropic and stress-dependent coordination number

Relating subsurface stress to velocity anisotropy can provide quantitative insight into the effects of reservoir production. Rock-physics models using effective medium theory for unconsolidated sands can be built to establish this link, although empirical corrections are often required. In pursuit of this goal, fractional changes in elastic moduli have been related to fractional changes in stress through a perturbation analysis of the extended Walton model. The stress path considered was composed of isotropic loading followed by an arbitrary stress perturbation. The coefficients derived are dependent on granular elastic moduli and the proportion of grains with no-slip contacts but are conveniently independent of strain and porosity. A modification of these relationships has been introduced using an anisotropic stress-dependent coordination number, whose parameters can be derived from isotropic moduli-stress experiments. The inclusion of an anisotropic coordination number improved the model’s fit to experimental results of unconsolidated sands subject to anisotropic loading.

Improved granular medium model for unconsolidated sands using coordination number, porosity, and pressure relations

We have developed a recipe for using closed-form expressions of effective-medium models to predict velocities in unconsolidated sandstones. The commonly used Hertz-Mindlin effective-medium model for granular media often predicts elastic wave velocities that are higher, and [Formula: see text] ratios that are lower, than those observed in laboratory and well log measurements in unconsolidated sediments. We use the extended Walton model, which introduces a parameter [Formula: see text] to represent the fraction of grain contacts that are perfectly adhered. Using the extended Walton model with [Formula: see text] ranging from 0.3 to 1, we obtain new empirical relations between the coordination number (C), porosity, and pressure for P- and S-wave velocities by inverting dynamic measurements on dry, unconsolidated sands. We propose using the extended Walton model [Formula: see text] along with these new C-porosity and C-pressure relations to study the mechanical compaction of unconsolidated sandstones. The model has been tested on two experimental data sets. It provides a reasonable fit to observed P- and S-wave velocities and specifically improves shear-wave predictions.

Natural Ventilation - A New Method Based on the Walton Model Applied to Cross-Ventilated Buildings having Two Large External Openings

In order to provide comfort in a low energy consumption building, it is preferable to use natural ventilation rather than HVAC systems. To achieve this, engineers need tools that predict the heat and mass transfer between the building's interior and exterior. This paper presents a method implemented in some building software, and the results are compared to CFD. The results show that the knowledge model is not sufficiently well described to identify all the physical phenomena and the relationships between them. A model was developed which introduces a new building-dependent coefficient allowing the use of Walton's model, as extended by Roldan to large external openings, and which better represents the turbulent phenomena near large external openings. The formulation of the mass flow rates was inversed to identify modelling problems. It appears that the discharge coefficient is not the only or best parameter to obtain an indoor static pressure compatible with CFD results, or to calculate more realistic mass flow rates.

Granular gases

The dynamic evolution of granular gases is fundamentally different from molecular gases due to the energy loss during collisions. Nevertheless techniques of kinetic theory are useful in a regime, when the granular particles are moving rapidly and the gas is sufficiently dilute. In these lecture notes we analyse in detail the collision of two rough particles which is inelastic due to incomplete normal and tangential restitution as well as Coulomb friction. Based on the Walton model a time evolution operator for the many particle system is introduced, a formalism which is well suited for simple approximations. We discuss free cooling of granular particles with particular emphasis on the exchange of energy between rotational and translational degrees of freedom.