Research on Feasibility of Several High Density Materials for EFP Liner and Material Selection Criteria

2017 ◽  
Vol 42 (4) ◽  
pp. 360-369 ◽  
Author(s):  
Li Ding ◽  
Jianwei Jiang ◽  
Jianbing Men ◽  
Shuyou Wang ◽  
Mei Li
Keyword(s):  
Selection Criteria ◽  
Material Selection ◽  
High Density

scholarly journals Use of Silicone Sizers in Implantation of Porous Polyethylene Nasal Dorsal Implants in Asians

2011 ◽  
Vol 2011 ◽  
pp. 1-3
Author(s):  
Randal Pham
Keyword(s):  
Selection Criteria ◽  
High Density ◽  
Nasal Surgery ◽  
Porous Polyethylene ◽  
Asian Patients ◽  
Thin Skin ◽  
History Of ◽  
A New Technique ◽  
Patient Selection Criteria ◽  
Porous Polyethylene Implants

Introduction. A new technique of implantation of high-density porous polyethylene nasal dorsal implants in Asians is described in this paper. Silicone sizers, which have smooth surfaces, were used to facilitate implantation of porous polyethylene implants in Asian patients. Materials and Methods. Twenty-three patients of Asian descent underwent dorsal augmentation rhinoplasty with open technique using high-density porous polyethylene implants. In all cases, silicone sizers were used to facilitate implantations of high-density porous polyethylene nasal dorsal implants. Patient selection criteria exclude patients with history of cocaine use, history of nasal or sinus disorders, previous nasal surgery, deviated septum, poor cartilage support, and thin skin. Results. No bleeding, infection, rejection, displacement, or extrusion was noted. One implant was removed because of a patient's dissatisfaction with the resulting tip height. Conclusion. The use of silicone sizers to facilitate implantations of high-density porous polyethylene nasal dorsal implants was safe and efficacious.

Characterization and Technical Comparison Between Steel Tube Umbilicals and Thermoplastic Hoses Umbilicals

2009 ◽  
Author(s):  
Andre´ Athayde Gonc¸alves ◽  
Fernando Buscacio de Almeida ◽  
Marco Antoˆnio Dias ◽  
William Albuquerque da Silva ◽  
Yonathan Reboh
Keyword(s):  
Selection Criteria ◽  
Material Selection ◽  
Structure Type ◽  
Steel Tube ◽  
Steel Tubes ◽  
Advantages And Disadvantages ◽  
Great Production ◽  
Higher Temperature ◽  
And Control ◽  
Production Losses

Subsea umbilicals are key part on the development of deep water fields. Generally, they are used to connect Platforms to all type of subsea equipment. Umbilicals’ component failure may result to great production losses. Traditionally, Petrobras uses thermoplastic hoses for chemical injection and control applications in its subsea systems; it has acquired a great deal of technical knowledge. Nevertheless, in recently presented layouts, the steel tubes have gained importance worldwide and this was due the increased water depth, integrity and higher pressure / higher temperature. This present paper makes a technical comparison between Steel Tube Umbilicals and Thermoplastic Hose Umbilicals with focus on Petrobras experience. The first part analyzes material selection criteria considering each structure type. Subjects such as material, welding and construction of both types are commented. This work also points to important subjects that suppliers must consider when designing and manufacturing umbilicals. The second part presents the Petrobras’ qualification tests of control umbilicals. Some of the tests that are used for steel tubes, thermoplastic hoses and high collapse resistant hoses are listed as well. On the third part, the focuses are the fatigue analysis, installation procedures and corrosion aspects. The work concludes listing some advantages and disadvantages when using Steel Tube Umbilicals or Thermoplastic Hoses Umbilicals, considering Petrobras scenarios.

Relating Material Selection and Sustainability in Design

2018 ◽  
Vol 43 (2) ◽  
pp. 28-32
Author(s):  
Elif Sonmez ◽  
Filiz Tavsan
Keyword(s):  
Renewable Resources ◽  
Selection Criteria ◽  
Material Selection ◽  
Special Importance ◽  
Materials Selection ◽  
Factors Affecting ◽  
Interview Technique ◽  
Materials Used ◽  
The Relationship

It is likely that under modern-day conditions, design, designer and materials selection would follow a parallel continuum in a cycle. The attitude in materials selection confronts us as one of the substantial values directing the design. Therefore, it should be approached in certain criteria. Today, designers have to put emphasis on not only the setting and style of the space they are designing, but also on the relationship between the materials used and the environment at the same time. In our day, designers have an intense awareness on the use of renewable resources. Hence, it is obvious that a special importance should be given to the fact that the materials are in a cycle of sustainable and recycled. In this study, 15 design offices are asked the question of “what are the factors affecting your materials decisions and what are your selection criteria in general?” by using the interview technique. As a result of interviews conducted with design offices regarding their materials selection, many criteria are identified. It is seen that although sustainability is not clearly stated by designers among these criteria, it actively takes part in the content. In the light of answers provided and interviews, the relationship between materials selection criteria and sustainability will be examined over the standpoints of 12 offices that particularly mentioned the area of sustainability.

Detecting climate-related trends in streamflow data

2002 ◽  
Vol 45 (8) ◽  
pp. 89-104 ◽  
Author(s):  
Paul J. Pilon ◽  
Sheng Yue
Keyword(s):  
Local Knowledge ◽  
Serial Correlation ◽  
Selection Criteria ◽  
Spatial Scales ◽  
High Density ◽  
Global Network ◽  
Trend Detection ◽  
Testing Procedures ◽  
Stable Conditions ◽  
Streamflow Data

This paper reviews the results of a number of studies that have investigated streamflow data for the existence of trend. These studies provide evidence that trends in various, but not all, streamflow regimes are occurring at rates that are higher than one might attribute to chance alone. Results of different studies using different approaches were compared and were shown, at times, to have dramatic differences. These differences might potentially be due to pre-conditioning of data prior to trend detection in attempts to minimize the impacts of serial correlation on testing procedures. It was also evident that patterns of trend can vary over small spatial scales and that a relatively high-density network is required to effectively comprehend trend and how it might be altering across an area. A global network of streamflow sites representing pristine or stable conditions is needed to assess patterns of change. Selection criteria for sites within such a network are provided, and it is highlighted that local knowledge is required to perform this selection.

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