scholarly journals Factors affecting clay dispersion in oxisols treated with vinasse

2016 ◽  
Vol 37 (6) ◽  
pp. 3997 ◽  
Author(s):  
Thadeu Rodrigues de Melo ◽  
Tiago Santos Telles ◽  
Walquiria Silva Machado ◽  
João Tavares Filho
Keyword(s):  
Sandy Soil ◽  
Physical Quality ◽  
Factors Affecting ◽  
Clay Dispersion ◽  
Water Dispersible ◽  
Dispersive Effect ◽  
Bivalent Cations ◽  
Chemical Attributes ◽  
Almost All ◽  
Dispersible Clay

Vinasse is a potassium-rich waste generated in large amounts by the ethanol production that, applied in the soil, can promote changes in water dispersible clay and in its physical quality. The aim of this study was to evaluate the clay dispersion of Oxisols after vinasse application and correlate it with some chemical attributes. Samples were collected in two Oxisols (155 and 471 g of clay kg-1), put in pots, received dosages of vinasse (0, 50, 100, 150 and 200 m3 ha-1) and remained incubated during 120 days. Phosphorous, organic carbon, pH H2O, pH KCl, pH CaCl2, Al3+, H+Al3+, Ca2+, Mg2+, K+, Na+, Delta pH and the proportion between monovalent and bivalent cations have been evaluated and correlated with the clay flocculation degree. Vinasse changed almost all chemical variables in both soils and increased the flocculation in the sandy soil, but did not change the clayey one. Delta pH, Mg2+ and K+ significantly correlated with the flocculation degree in the sandy soil. It is possible to conclude that the dispersive effect of K+ added by vinasse are irrelevant, considering the flocculant effect caused by the increment in Mg2+ and Delta pH after vinasse application.

scholarly journals Water-dispersible clay in soils treated with sewage sludge

2010 ◽  
Vol 34 (5) ◽  
pp. 1527-1534 ◽  
Author(s):  
João Tavares Filho ◽  
Graziela Moraes de Césare Barbosa ◽  
Adriana Aparecida Ribon
Keyword(s):  
Sewage Sludge ◽  
Block Design ◽  
Clay Fraction ◽  
Organic Matter Content ◽  
Soil Samples ◽  
Point Of Zero Charge ◽  
Native Forest ◽  
Water Dispersible ◽  
Significant Difference ◽  
Dispersible Clay

A by-product of Wastewater Treatment Stations is sewage sludge. By treatment and processing, the sludge is made suitable for rational and environmentally safe use in agriculture. The aim of this study was to assess the influence of different doses of limed sewage sludge (50 %) on clay dispersion in soil samples with different textures (clayey and medium). The study was conducted with soil samples collected from native forest, on a Red Latosol (Brazilian classification: Latossolo Vermelho distroférrico) loamy soil in Londrina (PR) and a Red-Yellow Latosol (BC: Latossolo Vermelho-Amarelo distrófico) medium texture soil in Jaguapitã (PR). Pots were filled with 3 kg of air-dried fine earth and kept in greenhouse. The experiment was arranged in a randomized block design with six treatments: T1 control, and treatments with limed sewage sludge (50 %) as follows: T2 (3 t ha-1), T3 (6 t ha-1), T4 (12 t ha-1), T5 (24 t ha-1) and T6 (48 t ha-1) and five replications. The incubation time was 180 days. At the end of this period, the pots were opened and two sub-samples per treatment collected to determine pH-H2O, pH KCl (1 mol L-1), organic matter content, water-dispersible clay, ΔpH (pH KCl - pH-H2O) and estimated PZC (point of zero charge): PZC = 2 pH KCl - pH-H2O, as well as the mineralogy of the clay fraction, determined by X ray diffraction. The results showed no significant difference in the average values for water-dispersible clay between the control and the other treatments for the two soil samples studied and ΔpH was the variable that correlated best with water-dispersible clay in both soils.

scholarly journals AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS

2015 ◽  
Vol 16 (1) ◽  
Author(s):  
Muhammad Abid ◽  
Muhammad Shahid Khalil ◽  
Hafiz Abdul Wajid
Keyword(s):  
Dynamic Behaviour ◽  
Relaxation Behaviour ◽  
Bolted Joint ◽  
Factors Affecting ◽  
Elastic Interactions ◽  
Short And Long Term ◽  
The Many ◽  
Almost All ◽  
Static Behaviour

Loss of pre-load with time, commonly known as ‘Relaxation’ is an established phenomena. Behaviour of a bolted joint depends upon the pre-load in the bolts in use, not the pre-load introduced by the mechanic. Loss of pre-load is expected due to the many factors such as embedment relaxation, gasket creep, elastic interactions, and vibration loosening or stress relaxation. In a gasketed joint, due to the gasket flexibility, relaxation is always substantial during preliminary passes, as 80 to 100% loss is not uncommon in almost all the bolts, resulting in a dynamic behaviour. Pre-load in a gasketed joint is stabilized and retained to certain extent in the final passes only. In a non-gasketed joint, due to no gasket and no rotation its static behaviour is concluded. This paper highlights the factors affecting the amount of relaxation with time and presents important considerations that can reduce this. Both the short and long term relaxations are recorded and a ‘best fit’ model for relaxation behaviour is derived.

scholarly journals The Effects of Picking Up Primary School Pupils on Surrounding Street’s Traffic: A Case Study in Hanoi

2020 ◽  
Vol 14 (1) ◽  
pp. 237-250
Author(s):  
Dinh Hiep ◽  
Vu V. Huy ◽  
Teppei Kato ◽  
Aya Kojima ◽  
Hisashi Kubota
Keyword(s):  
Primary School ◽  
Traffic Safety ◽  
Traffic Congestion ◽  
Traffic Management ◽  
Primary Schools ◽  
Traffic Accidents ◽  
Binary Logistic Regression ◽  
Binary Logistic Regression Model ◽  
Factors Affecting ◽  
Almost All

Introduction: One of the significant characteristics of schools in Vietnam is that almost all parents send their children to school and/or pick up their children from school using private vehicles (motorcycles). The parents usually stop and park their vehicle on streets outside the school gates, which can lead to serious congestion and increases the likelihood of traffic accidents. Methods: The objective of this study is to find out factors affecting the picking up of pupils at primary school by evaluating the typical primary schools in Hanoi city. A binary logistic regression model was used to determine factors that influence the decision of picking up pupils and the waiting duration of parents. The behavior of motorcyclists during the process of picking up pupils at the primary school gate has been identified and analyzed in detail by the Kinovea software. Results and Discussion: The study showed that, on the way back home, almost all parents use motorbikes (89.15%) to pick up their children. During their waiting time (8.48 minutes in average), they made a lot of illegal parking actions on the street there by, causing a lot of “cognitive” errors and “crash” points surrounding in front of the primary school entrance gate. Risky picking-up behaviors were significantly observed, i.e. picking-up on opposite side of the school, making a U-turn, backing-up dangerously, parking on the middle of street, and parking on the street next to sidewalk). Conclusion: Based on the analyzed results, several traffic management measures have been suggested to enhance traffic safety and reduce traffic congestion in front of school gates. In addition, the results of the study will provide a useful reference for policymakers and authorities.

scholarly journals Factors Affecting the Perception and Practice of Iranian Nomadic and Semi-Nomadic Pastoralists in Regard to Biosecurity Practices in Sheep and Goat Farms: A Cross-Sectional and Prospective Study

Ruminants ◽  
2022 ◽  
Vol 2 (1) ◽  
pp. 54-73
Author(s):  
Zeinab Hatami ◽  
Richard A. Laven ◽  
Saeid Jafari-Gh. ◽  
Mahdi Moazez-Lesko ◽  
Pegah Soleimani ◽  
...  
Keyword(s):  
Prevention Measures ◽  
Extension Programs ◽  
Cross Sectional ◽  
Mortality And Morbidity ◽  
Factors Affecting ◽  
Nomadic Pastoralists ◽  
Almost All ◽  
Biosecurity Practices ◽  
Umbilical Cords ◽  
Annual Mortality

Preventing the spread of diseases between and within farms (biosecurity) is essential for minimizing animal mortality and morbidity, as well as for reducing the risk of spread of zoonotic diseases. These effects are even greater in countries such as Iran, which have to deal with multiple ongoing epidemics of infectious disease. However, there is currently no published information about biosecurity practices on sheep and goat farms in Iran in published research. The aim of this study was to collect such information and to identify some of the factors affecting biosecurity practices. Data were gathered using a checklist and in-depth interviews with 99 nomadic and semi-nomadic pastoralists. Regression analysis was used to identify the relationships between the collected variables and the biosecurity scores. The results showed that neither within- nor between-farm disease prevention measures were appropriately applied on most farms (median total score of total biosecurity was 37.3/90; Q1 = 29.0 and Q3 = 44.7). Almost all the farmers reported slaughtering animals on farms and nobody properly disposed of the bodies of the dead animals. Additionally, the majority of the participants did not disinfect the umbilical cords of newborns. Of the collected variables, the annual mortality rate was associated with most within-farm biosecurity practices. The increase in annual mortality rates was associated with the regular cleaning of troughs (p = 0.03), preventing feed and water from being contaminated by urine and feces (p = 0.02), providing a clean and dry place for animals to rest (p = 0.05) and disinfecting the navel cord (p = 0.03). The results of this survey suggest that there is a clear need for extension programs to enhance Iranian and sheep and goat farmers’ perceptions and practices regarding biosecurity measures.

scholarly journals Investigation of moderator factors in e-business adoption: A quantitative meta-analysis of moderating effects on the drivers of intention and behavior

2017 ◽  
Vol 14 (1) ◽  
pp. 75-102 ◽  
Author(s):  
Bostjan Sumak ◽  
Marjan Hericko ◽  
Zoran Budimac ◽  
Maja Pusnik
Keyword(s):  
Technology Acceptance ◽  
New Technologies ◽  
Causal Effect ◽  
Meta Analysis ◽  
Moderating Effect ◽  
Factors Affecting ◽  
Adoption Research ◽  
Acceptance Model ◽  
Almost All ◽  
Business Technology

E-business technology is becoming one of the most important global markets where e-business solutions will have to adapt to new technologies. The main objective in this study was to synthesize existing knowledge in the field of e-business technology acceptance and to understand differences in Technology Acceptance Model (TAM) related causal effect sizes for different e-business contexts. A quantitative meta-analysis of existing empirical research about factors affecting e-business adoption was conducted using 89 published papers that provided empirical data about causal relationships. A moderator analysis was carried out to investigate the moderating effect of four factors: consumer type, device type, continent and respondent type. The results of the study showed a moderating effect for all four proposed factors in almost all TAM-related causal paths. The study also showed that TAM is the most common theory being applied in e-business adoption research.

scholarly journals Factors Affecting Nursing Ability To Know Acute Coroner Syndrome In Emergency Installation

2018 ◽  
Vol 2 (1) ◽  
pp. 64-72
Author(s):  
Agus Riyadi ◽  
Karmiati Karmiati
Keyword(s):  
Emergency Department ◽  
Acute Coronary Syndrome ◽  
Emergency Services ◽  
P Value ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Research Education ◽  
Coronary Syndrome ◽  
Coronary Syndromes ◽  
Almost All

Background: Coronary heart disease is the most cardiovascular disease that causes death in the world. The ability of nurses to recognize acute coronary syndromes is very necessary as part of the emergency services team. Purpose : The purpose of this study was to determine the description of the factors that influence the ability of nurses to know acute coronary syndrome in the emergency department of dr. Iskak Tulungagung. Methods : The design of this research is descriptive analytic with a cross sectional approach with the population of all nurses who work in the Emergency Department of dr. Iskak Tulungagung. The population is 55 nurses. The sample is all of the population, namely 55 respondents with total sampling sampling techniques. The data that has been collected is processed by a statistical test of Multivariate Analysis, Ordinal Regression with significance α = 0.05. Result : The results showed that most of the respondents with D3 education were 33 respondents (60.0%), almost all respondents had never attended ECG training in the amount of 50 respondents (90.9%) and almost half of the respondents had a working period of 2-5 year is 25 respondents (45.5%). The results of the regression regression analysis showed that the p-value = 0.855 on the education factor which means that H0 was accepted, the p-value = 0.041 in the training factor which means H1 is received, the p-value = 0.003 on the working period, which means that H1 is accepted Conclusion : Based on research, education does not affect the ability to recognize acute coronary syndrome. The education obtained will develop according to the increase in the work period and the frequent training that is obtained and practiced directly in real situations

scholarly journals Assistive devices: self-reported use by older people in Victoria

2002 ◽  
Vol 25 (4) ◽  
pp. 169 ◽  
Author(s):  
Robyn Smith ◽  
Susan Quine ◽  
Julie Anderson ◽  
Kirsten Black
Keyword(s):  
Older People ◽  
Service Providers ◽  
Assistive Devices ◽  
Factors Affecting ◽  
Payment Policy ◽  
Home Based ◽  
Home Modifications ◽  
Adequate Education ◽  
Almost All

A qualitative study was conducted in Victoria to explore factors affecting the acceptability and use of assistive devices by older people. Four focus groups and fifteen home-based interviews were conducted with older people (mean age 77 years) who had been issued with 2 or more assistive devices. Analysis of the data indicated that almost all participants were content to be advised by professionals on suitable equipment. Most considered the equipment and home modifications safe and easy to use, and appreciated the benefits for mobility, confidence and independence. Reasons for non-use were commonly related to changes in functional ability. Cost was a major deterrent for a small number who opted to 'make do'. Recommendations are made for improvements to the existing system of equipment provision and use, including: review and development of consistency of provision and payment policy among service providers; flexibility of payment options; adequate education and follow-up support for clients.

The Attractiveness of Schools of Management: The Case of Indonesia

2018 ◽  
Vol 3 (3) ◽  
pp. 162-168
Author(s):  
Kamaludin Kamaludin
Keyword(s):  
Doctoral Students ◽  
Small Towns ◽  
Jel Classification ◽  
Online Questionnaire ◽  
Factors Affecting ◽  
Managerial Skills ◽  
Depth Interview ◽  
Almost All ◽  
Rates Of Growth ◽  
Research Show

Objective - In recent times, schools of management in Indonesia have experienced rapid rates of growth all over the country in both big cities and small towns. The increase in interest to join schools of management is reflected by the number of schools of management at the undergraduate, master and doctoral levels that exist in almost all universities, particularly at the undergraduate and master levels. This research aims to determine the factors that influence the decision of an undergraduate, master or doctoral student to enroll in a school of management. Methodology/Technique - This study uses factor analysis and in-depth interview. The data is collecting using an online questionnaire distributed through WhatsApp groups and emails to undergraduate, masters and doctoral students throughout Indonesia. 366 questionnaires were distributed in total. Findings - The result of research show that the factors affecting students' decisions to enroll at schools of management are the process, product, and motivation. While the high interest in entering master and doctoral in management with the non-management background is caused by several factors, primarily, due to its relevance to their work, career development, accreditation, and other factors. Novelty - Those students that already occupy key positions in both private and government sectors consider managerial skills are more dominant in schools of management. Type of Paper: Empirical. Keywords: Attractiveness; Management; Undergraduate; Master; Doctoral. JEL Classification: A20. A22. A29.

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