Acoustic Resonance in a Package Boiler and Its Solution—A Case Study

2006 ◽  
Vol 129 (4) ◽  
pp. 759-762 ◽  
Author(s):  
Frantisek L. Eisinger ◽  
Robert E. Sullivan
Keyword(s):  
Acoustic Resonance ◽  
Acoustic Mode ◽  
Flow Channel ◽  
Tube Bank ◽  
Resonant Condition ◽  
Entire Depth ◽  
Downstream Section ◽  
One Year

Strong acoustic resonance with acoustic pressures reaching up to 165dB developed in the boiler bank of a package boiler at full load. At first, the resonance developed at a lower frequency in the downstream portion of the tube bank and was suppressed by an acoustic baffle covering the downstream section of the flow channel. After about one year of operation, a second resonant condition developed. Tests confirmed that, again, a strong resonant condition developed at a higher frequency in the unbaffled upstream portion of the flow channel. Computer analysis confirmed that the initial resonance occurred at the first acoustic mode of the flow channel while the follow-up resonance occurred at the second mode of the flow channel expressed as a first-mode resonance in a different (upstream) location. An extension of the acoustic baffle covering the entire depth of the tube bank eliminated the vibration. This paper gives a description of the problem and summarizes the theoretical and experimental results substantiating the findings.

Acoustic Resonance in a Package Boiler and Its Solution: A Case Study

2005 ◽  
Author(s):  
Franktisek L. Eisinger ◽  
Robert E. Sullivan
Keyword(s):  
Acoustic Resonance ◽  
Acoustic Mode ◽  
Flow Channel ◽  
Tube Bank ◽  
Resonant Condition ◽  
Entire Depth ◽  
Downstream Section ◽  
One Year

Strong acoustic resonance with acoustic pressures reaching up to 165 dB developed in the boiler bank of a package boiler at full load. At first, the resonance developed at a lower frequency in the downstream portion of the tube bank and it was suppressed by an acoustic baffle covering the downstream section of the flow channel. After about one year of operation, a second resonant condition developed. Tests confirmed that again a strong resonant condition developed at a higher frequency in the unbaffled upstream portion of the flow channel. Computer analysis confirmed that the initial resonance occurred at the first acoustic mode of the flow channel while the follow-up resonance occurred at the second mode of the flow channel expressed as a first mode resonance in a different (upstream) location. An extension of the acoustic baffle covering the entire depth of the tube bank eliminated the vibration. The paper gives a description of the problem and summarizes the theoretical and experimental results substantiating the findings.

Individualized Behavioural Treatment of Severe Stuttering

1991 ◽  
Vol 19 (4) ◽  
pp. 347-357 ◽  
Author(s):  
Willi Ecker ◽  
Victor Meyer
Keyword(s):  
Oral Reading ◽  
Reading Improvement ◽  
Behavioural Treatment ◽  
Communication Situations ◽  
Cognitive Techniques ◽  
One Year

This case study illustrates the reduction of severe stuttering by an individually tailored treatment programme. Interventions are derived from a tripartite analysis (Lang, 1971) and include EMG biofeedback, regulated breathing, exposure in vivo to stressful communication situations and cognitive techniques to reduce relapse risk. The role of dysfunctional response system interactions in stuttering is emphasized. Treatment resulted in a marked reduction of stuttering and associated facial contortions during videotaped conversations with strangers and oral reading. Improvement was maintained at one-year follow-up.

A Successful Adaptation of Systematic Desensitization in the Treatment of a Phobia of Babies

1985 ◽  
Vol 2 (1) ◽  
pp. 59-64
Author(s):  
Michael Free ◽  
Margaret Beekhuis
Keyword(s):  
Young Woman ◽  
Skin Conductance ◽  
Treatment Strategy ◽  
Physiological Measures ◽  
Systematic Desensitization ◽  
Physiological Measure ◽  
One Year

A case study is presented of a young woman with an unusual phobia, a fear of babies. Barabasz's (1977) technique of systematic desensitization using psycho-physiological measures was chosen as the main treatment strategy. Difficulties arose as the client was unable to visualise scenes involving babies. Nor could she look at photographs of babies long enough for the hierarchy to be ordered using a psycho-physiological measure (skin conductance). A set of photographs was eventually used for the hierarchy, but it was ordered in terms of the length of time the client could look at the various photographs. Systematic desensitization was carried out using the set of photographs instead of imaginary scenes, together with some in vivo exposure in the latter stages of treatment. At termination the client could approach babies without discomfort. Improvement was maintained at one year follow-up.

Multigenerational Patterns and Internal Structures in Families in which Grandparents Raise Grandchildren

1998 ◽  
Vol 79 (5) ◽  
pp. 477-489 ◽  
Author(s):  
Robin Goldberg-Glen ◽  
Roberta G. Sands ◽  
Ralph D. Cole ◽  
Carolyn Cristofalo
Keyword(s):  
Life Satisfaction ◽  
Service Providers ◽  
Well Being ◽  
Family Structures ◽  
Systems Perspective ◽  
Internal Structures ◽  
One Year ◽  
Interactional Processes

‘Skipped generation’ families, consisting of grandparents and grandchildren with parents absent from the home, are frequently served in social work agencies. These families have unique multigenerational patterns and family structures that are important for service providers to recognize. This paper uses a multigenerational systems perspective to highlight the diversity among grandparent-headed households. Twenty families who were previously part of a larger study of stress, well-being, and life satisfaction among caregiving grandparents constituted a follow-up case study involving videotaped family interviews one year after the first study. Three families representing the range of diversity among the twenty are described with accompanying genograms. Differences in structure, interactional processes, and links with prior generations are identified in each case. These examples reveal the strengths and vulnerabilities, as well as the diversity, of grandparent-headed families.

Case study of postoperative neurocognitive decline in heart failure: Improved functioning at one year follow up

2011 ◽  
Vol 500 ◽  
pp. e30
Author(s):  
Kalliopi Megari ◽  
Mary H. Kosmidis ◽  
Helena Argiriadou ◽  
Giorgos Karapanagiotidis ◽  
Evanthia Thomaidou ◽  
...  
Keyword(s):  
Heart Failure ◽  
One Year ◽  
Neurocognitive Decline

MANAGING CHALLENGING BEHAVIOUR IN AN ADULT WITH LEARNING DISABILITIES: THE USE OF LOW AROUSAL APPROACH

1998 ◽  
Vol 26 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Andrew McDonnell ◽  
Simon Reeves ◽  
Amanda Johnson ◽  
Alan Lane
Keyword(s):  
Learning Disabilities ◽  
Behaviour Change ◽  
Single Case ◽  
Challenging Behaviour ◽  
Single Case Study ◽  
Short Term ◽  
One Year ◽  
Challenging Behaviours

Behaviour change is often a desired outcome for carers and professionals who work with people with learning disabilities and challenging behaviours. Managing these behaviours in the short term is an important step towards this goal. This single case study presents the use of a low arousal approach in managing challenging behaviours in a young man labelled with severe challenging behaviour. This strategy focuses on the interaction of the carers with the client and how their approach has an important impact on the behaviour of the client. The study documents the incidents of challenging behaviour and shows a decline in their frequency from baseline over a one-year period. These gains were maintained at five-month follow-up. The implications for services of these findings are discussed.

Assessing the Borrow Direct engineering e-book pilot

2015 ◽  
Vol 43 (4) ◽  
pp. 174-178 ◽  
Author(s):  
Douglas McGee
Keyword(s):  
Design Methodology ◽  
Case Study Approach ◽  
Interlibrary Loan ◽  
Similar Nature ◽  
Content Type ◽  
Study Approach ◽  
One Year ◽  
Joint Purchase

Purpose – The purpose of this paper is to provide an assessment of a one-year pilot exploring the joint purchase of e-books via demand-driven acquisition (DDA) conducted by engineering librarians from seven members of the Borrow Direct interlibrary loan partnership. Also provided are observations that may inform future initiatives of a similar nature. Design/methodology/approach – The author presents a case study approach and examination of the results. Findings – The pilot was discontinued as a result of dissatisfaction with its configuration, but it did offer significant financials savings as well as provide accessible copies of mutually acquired titles to each member. The pilot also offered several lessons that can inform future joint e-book endeavors. Originality/value – Multi-institutional joint e-book DDA acquisition has been attempted elsewhere; however, what is unique about this pilot is that it was managed by seven independent institutions without a central legal entity to oversee it. This paper is a follow-up to the author’s presentation at the 80th IFLA World Library and Information Congress, August 16-22, 2014, in Lyon, France.

Clinical Efficacy of a New Automated Hemoencefalographic Neurofeedback Protocol

2012 ◽  
Vol 15 (3) ◽  
pp. 930-941 ◽  
Author(s):  
Álvaro Machado Dias ◽  
Adrian Machado Van Deusen ◽  
Eduardo Oda ◽  
Mariana Rodrigues Bonfim
Keyword(s):  
Clinical Trial ◽  
Cognitive Performance ◽  
Cognitive Enhancement ◽  
Digital Signal ◽  
Controlled Clinical Trial ◽  
Brain Maps ◽  
One Year ◽  
Neurologically Intact

Among the ongoing attempts to enhance cognitive performance, an emergent and yet underrepresented venue is brought by hemoencefalographic neurofeedback (HEG). This paper presents three related advances in HEG neurofeedback for cognitive enhancement: a) a new HEG protocol for cognitive enhancement, as well as b) the results of independent measures of biological efficacy (EEG brain maps) extracted in three phases, during a one year follow up case study; c) the results of the first controlled clinical trial of HEG, designed to assess the efficacy of the technique for cognitive enhancement of an adult and neurologically intact population. The new protocol was developed in the environment of a software that organizes digital signal algorithms in a flowchart format. Brain maps were produced through 10 brain recordings. The clinical trial used a working memory test as its independent measure of achievement. The main conclusion of this study is that the technique appears to be clinically promising. Approaches to cognitive performance from a metabolic viewpoint should be explored further. However, it is particularly important to note that, to our knowledge, this is the world's first controlled clinical study on the matter and it is still early for an ultimate evaluation of the technique.

scholarly journals Dual language intervention in a case of severe speech sound disorder

2014 ◽  
Vol 4 (2) ◽  
pp. 93-111
Author(s):  
Eliane Ramos ◽  
Jean Mead
Keyword(s):  
Dual Language ◽  
Single Case ◽  
Speech Sound ◽  
Language Choice ◽  
Speech Sound Disorder ◽  
Phonological Processes ◽  
English Only ◽  
One Year

This single case study of a bilingual child with a severe speech sound disorder examined whether language transference occurs when treatment is provided in L1 or L2 and whether monolingual or bilingual intervention is most effective. A 6-year 5-month old sequential Portuguese/English bilingual female was seen for 3 separate intervention phases lasting about 2 months each. Four phonological processes common to both languages were targeted in either monolingual or bilingual conditions in each phase. The child’s speech was examined with formal tests and analyses of spontaneous speech after each phase. Results indicated that transference occurred in both directions for some processes (L1 to L2 and L2 to L1), but in general L1 had to be specifically targeted for significant improvement to occur. For both languages, the bilingual condition was most effective. A follow-up assessment one year after Portuguese treatment was interrupted revealed that the child continued to make progress in English only (the only language treated for the entire year) and her Portuguese phonology still showed the same errors as in the previous year. This case study provides further evidence that bilingual intervention is the preferred choice for bilingual children. Implications for language choice and future studies are discussed.

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