Pavement subsurface drainage: importance of appropriate subbase materials

2009 ◽  
Vol 46 (8) ◽  
pp. 987-1000 ◽  
Author(s):  
Marc Lebeau ◽  
Jean-Marie Konrad
Keyword(s):  
Water Movement ◽  
Material Selection ◽  
Theoretical Models ◽  
Subsurface Drainage ◽  
Repeated Loading ◽  
Drainage Time ◽  
Base Materials ◽  
Lateral Drainage ◽  
Time To Drain

Past and current research has clearly established the detrimental effects of inadequate subsurface drainage within a road environment. In response, pavement engineers have developed a number of theoretical models to establish the lateral drainage requirements of pavements. The intention of the present paper is to extend current drainage design by accounting for the presence of a pervious subbase layer. A parametric study of an extended form of the time to drain problem was performed while focusing on the effect of subbase material characteristics under saturated and unsaturated conditions. The numerical results established that the addition of a suitable subbase material can shift drainage time from days to minutes by combining the effects of gravity, seepage distance, and discharge area to enhance vertical water movement. Although increasing saturated hydraulic conductivity of the subbase material was generally shown to favour vertical drainage, it also created a capillary barrier effect that hindered downward flow. The results of this analysis emphasize the importance and relevance of subbase material selection for improving the drainage quality of dense-graded base materials, which display excellent bearing capacity and remain stable under repeated loading.

Cancer and Cancer Treatment-Related Cognitive Impairment

2019 ◽  
pp. 60-83
Author(s):  
James C.  Root ◽  
Elizabeth Ryan ◽  
Tim A. Ahles
Keyword(s):  
Cancer Survivors ◽  
Cancer Treatment ◽  
Clinical Presentation ◽  
Functional Neuroimaging ◽  
Theoretical Models ◽  
Future Research ◽  
Cognitive Changes ◽  
Central Nervous System Cancer ◽  
Pharmacologic Treatments

As the population of cancer survivors has grown into the millions, there is increasing emphasis on understanding how late effects of treatment impact survivors’ ability return to work/school, ability to function and live independently, and overall quality of life. Cognitive changes are one of the most feared problems among cancer survivors. This chapter describes the growing literature examining cognitive changes associated with non-central nervous system cancer and cancer treatment. Typical elements of cancer treatment are discussed, followed by a description of clinical presentation, self-reported and objectively assessed cognitive findings, and results of structural and functional neuroimaging research. Genetic and other risk factors for cognitive decline following treatment are identified and discussed, together with biomarkers and animal models of treatment-related effects. This is followed by a discussion of behavioral and pharmacologic treatments. Finally, challenges and recommendations for future research are provided to help guide subsequent research and theoretical models.

scholarly journals Efficiency increase in combined electro-chemical grinding of hard alloys by diamond metal bonded disks

2017 ◽  
Vol 2 (2) ◽  
pp. 3-8
Author(s):  
Ольга Медведева ◽  
Olga Medvedeva ◽  
Александр Янюшкин ◽  
Aleksandr Yanyushkin ◽  
Павел Архипов ◽  
...  
Keyword(s):  
Theoretical Models ◽  
Capacity Factor ◽  
Hard Alloys ◽  
Metal Bond ◽  
Disc Cutting ◽  
Efficiency Increase ◽  
The Stability ◽  
Cutting Capacity ◽  
Diamond Disc

In the paper there are emphasized problems connected with the use of diamond metal bond abrasive discs at the processing of hard alloys. The reasons of cutting capacity decrease are pointed out which limit a wide-spread use of a diamond metal bond tool. It is established that for the achievement of a required productivity and quality of ready products is possible at the expense of the application of electro-chemical and electro-physical methods of stropping and also due to the improvement of abrasive disc designs. This work reports the investigations of a cutting capacity of diamond discs at the working of hard alloys by a combined method of electro-chemical grinding with simultaneous continuous stropping. As an output parameter there was accepted a cutting capacity factor of a diamond which was assesses according to the changes in effective working capacity. On the basis of the results of the experimental data processed there were obtained theoretical models of the dependence of the cutting capacity factor upon electric and mechanical constituents of the modes of combined electro-chemical grinding. A complex of investigations directed to the detection of efficient modes ensuring the stability of cutting capacity in diamond metal bond discs is carried out. It is experimentally confirmed that the application of the method of combined electro-chemical grinding with the simultaneous continuous disc stropping at working hard alloy materials allows increasing diamond disc cutting capacity by 15% in comparison with other methods of the diamond working of such materials.

Preschool Teacher Identity

2016 ◽  
pp. 1914-1942
Author(s):  
Sanja Tatalović Vorkapić ◽  
Lidija Vujičić ◽  
Renata Čepić
Keyword(s):  
Teacher Identity ◽  
Cultural Context ◽  
Preschool Teachers ◽  
Theoretical Models ◽  
Preschool Teacher ◽  
Study Program ◽  
Learning And Teaching ◽  
Education And Care ◽  
Best Teachers

The teaching process cannot be simplified to definitions of the best teachers as those possessing certain desirable teaching behaviours and skills (Katz, 2002). Although there are numerous factors that significantly influence learning and teaching, one might agree that specific teaching roles dominantly determine the quality of preschool teaching processes and learning outcomes. Furthermore, two equally important dimensions that characterize teaching roles, as linked with concepts of identity, are professional and personal dimensions. Therefore, one might be wondering: Who are contemporary preschool teachers? How do they define their self and identity? What determines identity that preschool teachers describe as theirs? Consequently, how do these identities influence the quality of process of early and preschool care and education? Answering these questions is no easy task since the concept of identity is defined in various ways in the more general literature (Beijaard, Meijer, & Verloop, 2004). This chapter is focused on an analysis of preschool teacher identity from three specific aspects. First, since all identity models emphasize the cultural context within which preschool teachers' identity develops and its crucial role, contemporary changes in preschool teacher roles and a new study program called Early and Preschool Teacher Education and Care are analysed in the Croatian context. Secondly, in order to follow contemporary literature, theoretical models of identity are presented. Afterwards, based on such models, the personality traits and temperament of research participants are analysed within the context of preschool teacher identity. Finally, the chapter's third section analyses preschool teachers' values, motives, and narratives.

Preschool Teacher Identity

2014 ◽  
pp. 22-60 ◽  
Author(s):  
Sanja Tatalović Vorkapić ◽  
Lidija Vujičić ◽  
Renata Čepić
Keyword(s):  
Teacher Identity ◽  
Cultural Context ◽  
Preschool Teachers ◽  
Theoretical Models ◽  
Preschool Teacher ◽  
Study Program ◽  
Learning And Teaching ◽  
Education And Care ◽  
Best Teachers

The teaching process cannot be simplified to definitions of the best teachers as those possessing certain desirable teaching behaviours and skills (Katz, 2002). Although there are numerous factors that significantly influence learning and teaching, one might agree that specific teaching roles dominantly determine the quality of preschool teaching processes and learning outcomes. Furthermore, two equally important dimensions that characterize teaching roles, as linked with concepts of identity, are professional and personal dimensions. Therefore, one might be wondering: Who are contemporary preschool teachers? How do they define their self and identity? What determines identity that preschool teachers describe as theirs? Consequently, how do these identities influence the quality of process of early and preschool care and education? Answering these questions is no easy task since the concept of identity is defined in various ways in the more general literature (Beijaard, Meijer, & Verloop, 2004). This chapter is focused on an analysis of preschool teacher identity from three specific aspects. First, since all identity models emphasize the cultural context within which preschool teachers' identity develops and its crucial role, contemporary changes in preschool teacher roles and a new study program called Early and Preschool Teacher Education and Care are analysed in the Croatian context. Secondly, in order to follow contemporary literature, theoretical models of identity are presented. Afterwards, based on such models, the personality traits and temperament of research participants are analysed within the context of preschool teacher identity. Finally, the chapter's third section analyses preschool teachers' values, motives, and narratives.

scholarly journals Selected Issues Concerning Degradation of Material in the Production of Injection Molded Plastic Components

2016 ◽  
Vol 10 (3) ◽  
pp. 173-180
Author(s):  
Marek Jałbrzykowski
Keyword(s):  
Thermal Characteristics ◽  
Test Results ◽  
Base Materials ◽  
Plastic Materials ◽  
Technological Quality ◽  
Injection Molded ◽  
Plastic Components ◽  
Injection Molded Plastic ◽  
Selection Of

Abstract This paper presents the problem of thermal degradation of thermoplastic materials processed using the injection method. Attention was paid to the issue of the optimal selection of a dye for modifying the base materials. For the selected materials and dyes, derivatograph tests were performed in order to assess their thermal characteristics and breakdown kinetics. Additionally, tribological tests and microscope observations of selected samples were performed. The obtained test results suggest a diverse level of thermal processes in the analyzed materials. This is crucial for the appropriate selection of dyes for plastic materials. As it turned out, the tribological properties of materials can also influence the technological quality of the injected alloy.

scholarly journals Monitoring the Quality of Services in Electronic Banking

2016 ◽  
Vol 5 (3) ◽  
pp. 99-119 ◽  
Author(s):  
Radislav Jovovic ◽  
Elvis Lekic ◽  
Miroslav Jovovic
Keyword(s):  
Theoretical Model ◽  
Quantitative Research ◽  
Theoretical Models ◽  
Quality Of Services ◽  
Electronic Banking ◽  
Significant Information ◽  
Time Activity ◽  
Banking Services ◽  
Quantitative Research Methods

Abstract Successful development of electronic banking is in direct correlation with the quality of services in electronic banking. Therefore, it is necessary that the banks are familiar with the attributes of electronic services on which clients assess the bank’s quality and client’s satisfaction with them, in order to be able to monitor, correct and improve the performance of electronic banking. We start from the hypothesis that there are already developed theoretical models for measuring the quality of e-banking services but they must be adjusted to the specific environment that is analysed in order to obtain reliable and quality information. The qualitative and quantitative research methods are applied in this paper in order to a get adjusted theoretical model (instrument) for measuring the quality of electronic banking services. As a result of the conducted analysis, the initial theoretical model has been modified, so that the final version of the model (instrument) for measuring quality of online banking allows obtaining reliable data, and information in the particular environment. And the results are: significant information about the quality of e-banking, modified theoretical model, information about the dimensions of quality of e-banking, customer satisfaction, and pathways and guidelines for the improvement of e-banking. The measuring of quality of electronic banking services in not one time activity but repeated one, as permanent monitoring strategy. This research is widely applicable even though it was conducted in the context of Montenegrin e-banking, since most of the banks in Montenegro are owned by well-known European banks, and it is expected that the obtained knowledge and information can be generalized.

scholarly journals Radiographic study of patients submitted to total gastrectomy using Safatle reconstruction technique

2008 ◽  
Vol 45 (3) ◽  
pp. 230-233
Author(s):  
Alberto Luiz Monteiro Meyer ◽  
Eduardo Berger ◽  
Orlando Monteiro Jr. ◽  
Paulino Alberto Alonso ◽  
João Sadi Lerner
Keyword(s):  
Quality Of Life ◽  
Gastric Cancer ◽  
Total Gastrectomy ◽  
Gastrointestinal Transit ◽  
Jejunal Loop ◽  
Reconstruction Technique ◽  
Resected Stomach ◽  
Radiographic Study ◽  
Drainage Time

BACKGROUND: Ever since the first total gastrectomy, there has always been a great concern in increasing the survival of patients, and with the advance of techniques, in improving the quality of life of these patients. The most common reconstruction technique of the gastrointestinal transit is the Roux-en-Y. The reposition of a functional pouch in place of the resected stomach was proposed to minimize the postprandial symptoms, improve the nutritional grade and consequently, the quality of life. The Safatle reconstruction of the gastrointestinal transit technique consists of, in short, in the association of the interposition of the jejunal loop with partial transit through the duodenum, with an inverted Roux-en-Y and with the creation of a pouch which resembles the dynamics of the stomach, achieved by duodenojejunal segment which has an antiperistalsis emptying. AIM: To assess, by radiographic means, the emptying of the duodenojejunal pouch in patients submitted to total gastrectomy using the Safatle reconstruction technique. METHOD: Twelve patients submitted to total gastrectomy using the Safatle technique due to gastric cancer were studied. They were summoned to perform contrasted radiographies of the esophagus-duodenum-jejunum by the videofluoroscopic method during the months of July and August, 2005. RESULTS: All the patients presented satisfactory movement of the duodenojejunal pouch and an adequate emptying in antiperistalsis without food stasis. There has been an average 25-minute drainage time of the duodenojejunal pouch. CONCLUSION: The duodenojejunal pouch, in the patients submitted to total gastrectomy using the Safatle reconstruction, presented adequate emptying and movement.

Material Selection Based on Finite Element Method in Customized Iliac Implant

2020 ◽  
Vol 1000 ◽  
pp. 82-89
Author(s):  
Dhyah Annur ◽  
Muhammad S. Utomo ◽  
Talitha Asmaria ◽  
Daniel P. Malau ◽  
Sugeng Supriadi ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Material Selection ◽  
Potential Candidate ◽  
Basic Study ◽  
Common Location ◽  
Weight Support ◽  
Natural Geometry ◽  
Element Method

Osteosarcoma, as the most frequent bone tumor cases, can be found in the pelvis bone. Within the pelvis, the ilium is the most common location for osteosarcoma, followed by the acetabulum and then the ischium. Surgery of pelvis is difficult and the reconstruction is complicated mainly due to the geometry complexity and also the weight support function of the pelvis. Endoprosthesis of the ilium is therefore designed to increase the quality of life of the patient. In this study, the iliac implant is designed based on the natural geometry of the ilium, and the size is modified to fit the morphometry of the Eastern Asian. A finite element method (FEM) is proposed as a basic study in material selection. Titanium and its alloy (Ti-6Al-4V) are studied as the potential candidate for the proposed implant while the finite analysis of the bone was also included. As a preliminary study, in this FEM, only the static load is given, each material is assumed to be isotropic and the contacts were considered bonded. FEM in this study is expected to give a better understanding of the stress distribution, and to optimize the selection of materials.

Nursing Research in Parkinson’s Disease From 2006 to 2015

2016 ◽  
Vol 26 (2) ◽  
pp. 142-156 ◽  
Author(s):  
Ju Young Shin ◽  
Barbara Habermann
Keyword(s):  
Quality Of Life ◽  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Family Caregiving ◽  
Symptom Management ◽  
Family Members ◽  
Theoretical Models ◽  
Self Management ◽  
Nursing Research

Most people with Parkinson’s disease (PD) reside in their homes with their family members. Nurses are in a good position to partner with people with PD and their family members for better self-management of the disease and improved quality of life. The purpose of this systematic review was to assess the state of the science of nursing research related to PD during the 10-year period, 2006 to 2015. A total of 27 studies were included in this review. Family caregiving was the most studied topic, followed by symptom management/medication adherence, quality of life, end-of-life/palliative care, and functional status/improving function. Recommendations for future studies in PD include (a) developing and testing interventions based on theoretical models in the areas of self-management, symptom management, and function improvement in people with PD and for caregivers caring for people with advanced stage PD, and (b) building programs of research with interprofessional teams.

Quality of Life in People With Severe Dementia and Its Association With the Environment in Nursing Homes: An Observational Study

2018 ◽  
Vol 59 (4) ◽  
pp. 665-674 ◽  
Author(s):  
Rebecca Palm ◽  
Diana Trutschel ◽  
Christian G G Sorg ◽  
Martin N Dichter ◽  
Burkhard Haastert ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Nursing Homes ◽  
Observational Study ◽  
Nursing Home Residents ◽  
Theoretical Models ◽  
Annual Data ◽  
Significant Interaction Effect ◽  
Significant Difference ◽  
Diagnosis Of Dementia

Abstract Background and Objectives Theoretical models propose the environment as a factor influencing the quality of life (QoL) of nursing home residents with dementia. This study investigates whether the observed QoL differs depending on the type of care unit. Research Design and Methods DemenzMonitor is an exploratory, observational study involving annual data collection in German nursing homes (2012–2014). For this analysis, we selected residents with a recorded diagnosis of dementia and severe cognitive impairment. QoL was measured with the proxy assessment QUALIDEM. Four care unit types were investigated: large integrated, large segregated, small integrated, and small segregated. Results We did not find a significant difference between the care units. During the 2 years, the observed QoL was not affected by any of the care unit types in a statistically significant or clinically relevant manner. However, a significant interaction effect between time and care unit types was found. Discussion and Implications Structural and organizational characteristics of care units, which in turn have implications for residents characteristics and the quality of care, may influence the QoL of residents. This may explain the interaction we observed.

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