scholarly journals Homogenization in Hydrodynamic Lubrication: Microscopic Regimes and Re-Entrant Textures

2017 ◽  
Vol 140 (1) ◽  
Author(s):  
İ. N. Yıldıran ◽  
İ. Temizer ◽  
B. Çetin
Keyword(s):  
Film Thickness ◽  
Theoretical Study ◽  
Hydrodynamic Lubrication ◽  
Type Equation ◽  
Homogenization Theory ◽  
Review Of The Literature ◽  
Comprehensive Review ◽  
New Models ◽  
The Mean

The form of the Reynolds-type equation which governs the macroscopic mechanics of hydrodynamic lubrication interfaces with a microscopic texture is well-accepted. The central role of the ratio of the mean film thickness to the texture period in determining the flow factor tensors that appear in this equation had been highlighted in a pioneering theoretical study through a rigorous two-scale derivation (Bayada and Chambat, 1988, “New Models in the Theory of the Hydrodynamic Lubrication of Rough Surfaces,” ASME J. Tribol., 110, pp. 402–407). However, the resulting homogenization theory still remains to be numerically investigated. For this purpose, after a comprehensive review of the literature, three microscopic regimes of lubrication will be outlined, and the transition between these three regimes for different texture types will be extensively demonstrated. In addition to conventional textures, representative re-entrant textures will also be addressed.

scholarly journals The role of anxiety in binge eating behavior: a critical examination of theory and empirical literature

2013 ◽  
Vol 1 (2) ◽  
pp. 19 ◽  
Author(s):  
Diane L. Rosenbaum ◽  
Kamila S. White
Keyword(s):  
Negative Affect ◽  
Binge Eating ◽  
Negative Emotionality ◽  
Empirical Literature ◽  
Critical Examination ◽  
Review Of The Literature ◽  
Present Evidence ◽  
Comprehensive Review ◽  
Temporal Models

The purpose of this manuscript is to expand the understanding of binge eating by reviewing the role of aspects of negative affect. Specifically, this paper will present evidence for further investigation of the bearing that anxiety may have in binge eating development and maintenance. A comprehensive review of the literature regarding the relation of binge eating and anxiety was performed. Valuable contributions have been made to the binge eating literature regarding some aspects of negative affect (<em>i.e.,</em> depression); however, outside of bulimia nervosa studies, much of the theoretical and empirical binge eating research to date has not directly addressed the role of anxiety. Research supports expansion of investigations of negative emotionality and binge eating to include specific study of anxiety. Greater inclusivity and specificity in the unique contributions of various negative emotions may further the development of temporal models and intervention efforts.

scholarly journals Role of Probiotics in Pediatric Patients withHelicobacter pyloriInfection: A Comprehensive Review of the Literature

Helicobacter ◽  
2010 ◽  
Vol 15 (2) ◽  
pp. 79-87 ◽  
Author(s):  
Elena Lionetti ◽  
Flavia Indrio ◽  
Lorenzo Pavone ◽  
Giorgia Borrelli ◽  
Luciano Cavallo ◽  
...  
Keyword(s):  
Pediatric Patients ◽  
Review Of The Literature ◽  
Comprehensive Review

scholarly journals Perioperative Nutritional Aspects in Total Pancreatectomy: A Comprehensive Review of the Literature

Nutrients ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 1765
Author(s):  
Niccolò Furbetta ◽  
Annalisa Comandatore ◽  
Desirée Gianardi ◽  
Matteo Palmeri ◽  
Gregorio Di Franco ◽  
...  
Keyword(s):  
Risk Factors ◽  
Pancreatic Cancer ◽  
Prognostic Factors ◽  
Chronic Pancreatitis ◽  
Total Pancreatectomy ◽  
Invasive Procedure ◽  
Review Of The Literature ◽  
Nutritional Factors ◽  
Comprehensive Review

Total pancreatectomy (TP) is a highly invasive procedure often performed in patients affected by anorexia, malabsorption, cachexia, and malnutrition, which are risk factors for bad surgical outcome and even may cause enhanced toxicity to chemo-radiotherapy. The role of nutritional therapies and the association between nutritional aspects and the outcome of patients who have undergone TP is described in some studies. The aim of this comprehensive review is to summarize the available recent evidence about the influence of nutritional factors in TP. Preoperative nutritional and metabolic assessment, but also intra-operative and post-operative nutritional therapies and their consequences, are analyzed in order to identify the aspects that can influence the outcome of patients undergoing TP. The results of this review show that preoperative nutritional status, sarcopenia, BMI and serum albumin are prognostic factors both in TP for pancreatic cancer to support chemotherapy, prevent recurrence and prolong survival, and in TP with islet auto-transplantation for chronic pancreatitis to improve postoperative glycemic control and obtain better outcomes. When it is possible, enteral nutrition is always preferable to parenteral nutrition, with the aim to prevent or reduce cachexia. Nowadays, the nutritional consequences of TP, including diabetes control, are improved and become more manageable.

Measurements of Friction in Cold Metal Rolling

1996 ◽  
Vol 118 (3) ◽  
pp. 629-636 ◽  
Author(s):  
P. E. Tabary ◽  
M. P. F. Sutcliffe ◽  
F. Porral ◽  
P. Deneuville
Keyword(s):  
Film Thickness ◽  
Hydrodynamic Lubrication ◽  
Strip Thickness ◽  
Secondary Importance ◽  
Smooth Film ◽  
The Mean ◽  
Cold Metal ◽  
Aluminium Strip ◽  
Additive Molecule

Measurements of friction in rolling of aluminium strip on an experimental mill are described. Friction depended most strongly on the ratio Λ of the smooth film thickness to the combined roughness of the roll and strip, and on the reduction in strip thickness. Whether the greater roughness was on the roll or on the strip was found to be unimportant. Varying the oil temperature from 40 to 60°C was also found to be of secondary importance. Profilometry results suggested that friction was determined by the mean film thickness between the surfaces. At the slowest speeds and smallest films, friction was close to the value of 0.09 found in separate measurements in a disk machine of the boundary additive properties. At the highest speed the friction values, which were less than 0.01, could be explained by hydrodynamic lubrication. The transition between these two extremes occurred when the film thickness was of the order of the additive molecule length of 3 nm.

Meningioma: The Role of a Foreign Body and Irradiation in Tumor Formation

Neurosurgery ◽  
1991 ◽  
Vol 29 (1) ◽  
pp. 113-119 ◽  
Author(s):  
Jamshid Saleh ◽  
Howard J. Silberstein ◽  
Andrew L. Salner ◽  
Dean F. Uphoff
Keyword(s):  
Foreign Body ◽  
Obstructive Hydrocephalus ◽  
Pineal Region ◽  
Tumor Formation ◽  
Burr Hole ◽  
Intracranial Meningioma ◽  
Review Of The Literature ◽  
Comprehensive Review ◽  
Shunt Tube

Abstract A case of meningioma is reported. At the age of 18 years, the patient had undergone insertion of a Torkildsen shunt through a posteroparietal burr hole for obstructive hydrocephalus secondary to a tumor of the pineal region, of which no biopsy had been made. After the hydrocephalus was relieved, he underwent irradiation of the tumor. Thirty years later, he was treated for an intracranial meningioma wrapped around the shunt. The tumor followed the shunt in all of its intracranial course. Microscopy disclosed pieces of the shunt tube within the meningioma. The role of a foreign body and irradiation in the induction of meningiomas is discussed, and a comprehensive review of the literature is presented. (Neurosurgery 29:113-119, 1991)

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