Cost Effective Repair Techniques for Turbine Airfoils. Volume I

1978 ◽  
Author(s):  
J. A. Wein ◽  
W. R. Young
Keyword(s):  
Cost Effective ◽  
Turbine Airfoils ◽  
Repair Techniques

scholarly journals Strengthening and Repair of a Precast Reinforced Concrete Residential Building

2020 ◽  
Vol 6 (12) ◽  
pp. 2457-2473
Author(s):  
M. Jamal Shannag ◽  
Mahmoud Higazey
Keyword(s):  
Reinforced Concrete ◽  
Residential Building ◽  
Minimum Cost ◽  
High Strength ◽  
Cost Effective ◽  
Steel Beams ◽  
Reinforced Concrete Structure ◽  
Design Error ◽  
Analytical Tools ◽  
Repair Techniques

The deterioration or ageing of the existing infrastructures coupled with increased safety requirements necessitate immediate strengthening. Developing long lasting and cost effective repair techniques and materials continue to capture the attention of concrete professionals worldwide. The main purpose of this investigation was to extend the life span of a multi-storey precast reinforced concrete structure built in Riyadh 40 years ago. The condition assessments relied on analytical tools, visual, field and laboratory experiments for core samples collected from the building. The analytical checks of the building revealed considerable deflections of some slabs because of design error. The field and chemical analysis tests performed, confirmed the occurrence of durability defects as a result of poor workmanship during the construction stage. Several state-of-the-art repair techniques and materials were used for enhancing the service life of the structure at a minimum cost. The Repair strategy implemented included, removal of the deteriorated concrete, pouring a bonding agent on the surface of the damage, followed by injecting high strength cementitious grouts, supporting the deflected slabs using I-section steel beams, using cathodic protection to prevent corrosion, strengthening the columns and beams using carbon fiber reinforced polymer (CFRP) sheets, and steel jackets. Doi: 10.28991/cej-2020-03091630 Full Text: PDF

The Refurbishment of Rotating Steam Turbine Blades

1990 ◽  
Vol 27 (06) ◽  
pp. 356-360
Author(s):  
J. C. Hendelman ◽  
R. J. Bazzini
Keyword(s):  
Steam Turbine ◽  
Turbine Blades ◽  
Cost Effective ◽  
The United States ◽  
Variable Speed ◽  
Steam Turbine Blades ◽  
Maintenance Schedules ◽  
The Cost ◽  
Logical Extension ◽  
Repair Techniques

The remanufacture and repair of steam turbine parts continues to be a cost-effective and viable alternative to replacement with new parts in many cases, providing improved scheduling flexibility in situations where replacement part deliveries cannot support maintenance schedules, and where the cost of replacement parts is not justified when alternatives exist. The extension of these repair techniques to rotating steam turbine blades was a logical extension of the technology available to turbine owners and operators. With turbine blade failures remaining the leading cause of turbine failures in the United States, and 75 percent of all blade failures occurring in the L-0 and L-1 stages, many blades not previously considered candidates for repair are being reevaluated for refurbishment. Although the power generating utilities have led the way in turbine part "salvage" via repairs, the application of the techniques described herein are fully applicable to marine steam propulsion units. These being variable-speed machines, operation off "design point" is more common and blade service is more severe in most cases.

Gas Turbine Cooling: Moving From Macro to Micro Cooling

2013 ◽  
Author(s):  
Ronald S. Bunker
Keyword(s):  
Gas Turbine ◽  
Film Cooling ◽  
Stress Gradient ◽  
Internal Flow ◽  
Cost Effective ◽  
Turbine Cooling ◽  
Cooling Channels ◽  
Significant Performance ◽  
Gas Turbine Cooling ◽  
Turbine Airfoils

Up to the present time, virtually all production gas turbine engines utilize high-pressure turbine components that are cooled by various modes of bulk, or macro, internal flow passages and networks, many of which are then linked to external film cooling by holes through the walls. Typical examples of macro cooling include serpentine passages, swirl chambers, pin banks, and impingement jets. All cooled turbine airfoils in commercial operation today utilize cooling channels and film holes that are considered to be macroscopic in physical magnitude. The conventional delimiters between macro and micro cooling are (1) whether the feature (internal passages and holes) can be repeatedly manufactured via investment casting methods, and (2) whether the flow passage (film hole, impingement orifice, dust hole) may become plugged by particles in the cooling fluid. The acceptable sizes are relative to the turbine size and the operating environment. This study examines the limitations and weaknesses inherent in macro cooling and the reasoning that demands gas turbine cooling change to micro cooling methods. A brief history of the developments in micro cooling for turbine airfoils is presented, including the reasons why it has not yet become commercially viable. A simple cooling study is used to demonstrate the very significant performance gains that can be obtained with micro cooling, such as cooling flow reductions approaching 40%, and thermal stress (gradient) reductions of 50%. The key to realizing these gains in full lies in cost effective manufacturing and durability in operation.

The application of electron microscopy to diagnosis in gynecologic neoplasms and tumor-like conditions

1984 ◽  
Vol 42 ◽  
pp. 102-105
Author(s):  
Lawrence M. Roth
Keyword(s):  
Electron Microscopy ◽  
Reproductive Tract ◽  
Malignant Tumors ◽  
Frozen Section ◽  
Cost Effective ◽  
Female Reproductive Tract ◽  
Ultrastructural Examination ◽  
Specific Diagnosis ◽  
Potential Value ◽  
Gynecologic Neoplasms

The female reproductive tract may be the site of a wide variety of benign and malignant tumors, as well as non-neoplastic tumor-like conditions, most of which can be diagnosed by light microscopic examination including special stains and more recently immunoperoxidase techniques. Nevertheless there are situations where ultrastructural examination can contribute substantially to an accurate and specific diagnosis. It is my opinion that electron microscopy can be of greatest benefit and is most cost effective when applied in conjunction with other methodologies. Thus, I have developed an approach which has proved useful for me and may have benefit for others. In cases where it is deemed of potential value, glutaraldehyde-fixed material is obtained at the time of frozen section or otherwise at operation. Coordination with the gynecologic oncologist is required in the latter situation. This material is processed and blocked and is available if a future need arises.

The IBM-PC in electron microscopy

1996 ◽  
Vol 54 ◽  
pp. 612-613
Author(s):  
James F. Mancuso
Keyword(s):  
Head Start ◽  
Image Acquisition ◽  
Cost Effective ◽  
Financial Applications ◽  
Number Of Factors ◽  
Instrument Control ◽  
The Cost ◽  
Training And Support ◽  
Control Image ◽  
Ibm Pc

IBM PC compatible computers are widely used in microscopy for applications ranging from control to image acquisition and analysis. The choice of IBM-PC based systems over competing computer platforms can be based on technical merit alone or on a number of factors relating to economics, availability of peripherals, management dictum, or simple personal preference.IBM-PC got a strong “head start” by first dominating clerical, document processing and financial applications. The use of these computers spilled into the laboratory where the DOS based IBM-PC replaced mini-computers. Compared to minicomputer, the PC provided a more for cost-effective platform for applications in numerical analysis, engineering and design, instrument control, image acquisition and image processing. In addition, the sitewide use of a common PC platform could reduce the cost of training and support services relative to cases where many different computer platforms were used. This could be especially true for the microscopists who must use computers in both the laboratory and the office.

A Review of 21 iPad Applications for Augmentative and Alternative Communication Purposes

2012 ◽  
Vol 21 (2) ◽  
pp. 60-71 ◽  
Author(s):  
Ashley Alliano ◽  
Kimberly Herriger ◽  
Anthony D. Koutsoftas ◽  
Theresa E. Bartolotta
Keyword(s):  
Augmentative And Alternative Communication ◽  
Cost Effective ◽  
Alternative Form ◽  
Alternative Communication ◽  
Text To Speech ◽  
Reference Guide ◽  
Expressive Communication ◽  
Communication Needs ◽  
User Friendly ◽  
Ipad Applications

Abstract Using the iPad tablet for Augmentative and Alternative Communication (AAC) purposes can facilitate many communicative needs, is cost-effective, and is socially acceptable. Many individuals with communication difficulties can use iPad applications (apps) to augment communication, provide an alternative form of communication, or target receptive and expressive language goals. In this paper, we will review a collection of iPad apps that can be used to address a variety of receptive and expressive communication needs. Based on recommendations from Gosnell, Costello, and Shane (2011), we describe the features of 21 apps that can serve as a reference guide for speech-language pathologists. We systematically identified 21 apps that use symbols only, symbols and text-to-speech, and text-to-speech only. We provide descriptions of the purpose of each app, along with the following feature descriptions: speech settings, representation, display, feedback features, rate enhancement, access, motor competencies, and cost. In this review, we describe these apps and how individuals with complex communication needs can use them for a variety of communication purposes and to target a variety of treatment goals. We present information in a user-friendly table format that clinicians can use as a reference guide.

Teletinnitus Program at the VA Gulf Coast Veterans Health Care System

2014 ◽  
Vol 4 (1) ◽  
pp. 23-29
Author(s):  
Constance Hilory Tomberlin
Keyword(s):  
Health Care ◽  
Patient Satisfaction ◽  
Patient Care ◽  
Health Care System ◽  
Gulf Coast ◽  
New Technology ◽  
Cost Effective ◽  
Veterans Health ◽  
Potential Benefits ◽  
Care System

There are a multitude of reasons that a teletinnitus program can be beneficial, not only to the patients, but also within the hospital and audiology department. The ability to use technology for the purpose of tinnitus management allows for improved appointment access for all patients, especially those who live at a distance, has been shown to be more cost effective when the patients travel is otherwise monetarily compensated, and allows for multiple patient's to be seen in the same time slots, allowing for greater access to the clinic for the patients wishing to be seen in-house. There is also the patient's excitement in being part of a new technology-based program. The Gulf Coast Veterans Health Care System (GCVHCS) saw the potential benefits of incorporating a teletinnitus program and began implementation in 2013. There were a few hurdles to work through during the beginning organizational process and the initial execution of the program. Since the establishment of the Teletinnitus program, the GCVHCS has seen an enhancement in patient care, reduction in travel compensation, improvement in clinic utilization, clinic availability, the genuine excitement of the use of a new healthcare media amongst staff and patients, and overall patient satisfaction.

Sign in / Sign up

Export Citation Format

Share Document