When any structure is immersed in seawater, a fouling process begins whereby a great variety of marine organisms gradually attach themselves to the stucture. This process is quite…
Abstract
When any structure is immersed in seawater, a fouling process begins whereby a great variety of marine organisms gradually attach themselves to the stucture. This process is quite complex, and varies in nature according to the geographical region, but the effect on ships' hulls is to increase the weight and drag on the vessel, resulting in a greater expenditure of fuel in order to maintain a cruising speed; it has been estimated that this increase in fuel consumption is about 40% after just six months' fouling. Additional costs are incurred by the need periodically to clean off the fouling, plus there is of course a loss of revenue when the ship is dry‐docked and out of service.
High Resolution Photolithography and U‐V Curing of an Experimental Positive Resist (in German) MARTIN, B., Elektronik Produktion & Prüftechnik, No. 11, p. 662 (1983). A…
Abstract
High Resolution Photolithography and U‐V Curing of an Experimental Positive Resist (in German) MARTIN, B., Elektronik Produktion & Prüftechnik, No. 11, p. 662 (1983). A photolithographic process using the Deep U‐V Resist Waycoat WX‐159 in conjunction with the developer Waycoat HPR‐402 is described. The process is suitable for conventional U‐V exposure at 320 nm as well as for short‐wave U‐V exposure in the 220–320 nm range. In addition, the extent of resist separation during exposure with HPR‐402 and WX‐108 developers is compared. The stability of the line profile of the WX‐159 resist during the thermal cure process after development could be improved by exposing the developed structures with short‐wave U‐V light.
Swati Paranjape and Amogh Patkar
The present study was aimed to explore and analyse the multifaceted impact of coronavirus disease 2019 (COVID-19) on quality-of-life of survivors, in physical, social…
Abstract
Purpose
The present study was aimed to explore and analyse the multifaceted impact of coronavirus disease 2019 (COVID-19) on quality-of-life of survivors, in physical, social, psychological and environmental health domains.
Design/methodology/approach
This explanatory mixed-method study was conducted on 20 patients admitted in the Intensive Care Unit (ICU) of a tertiary care hospital having mild-to-moderate clinical spectrum. Scores of WHO Quality of Life Brief Version (WHO QOL BREF) questionnaire, a quantitative data source, were recorded during admission and two months post-discharge. Qualitative data were collected through in-depth telephonic interviews 2 months post-discharge.
Findings
Statistically significant improvement in the quality-of-life was seen post-discharge in all four domains. Explanatory qualitative data derived four themes. This experience was life changing and metamorphic. Many participants experienced social exclusions. However, they outlived it with hope, faith and positive frame of mind. Quarantine, limiting social contact impacted largely the well-being and mental health of patients. Integrated care and multidisciplinary protocols are accentuated to combat future crisis.
Research limitations/implications
COVID-19 was a wake-up call to human race for radical change in healthcare policies. Researchers have emphasised the need to build resilient communities. The role of this research in building evidence as a basis for informed integrated care and decision making is vital. Study findings suggest that along with exhausting physical symptoms survivors experienced psychological symptoms highlighting the need of integrated approach and tailor-made strategies in assessment and treatment.
Originality/value
Lack of integrated approach in the system resulted in long-lasting physical and psychosocial impact on the survivors. This novel mixed methods research report, adding a valuable insight to body of knowledge through first-hand information, help provide evidence base which can account for future research, policy reforms and response.
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Arts in America: A Bibliography. Ed. by Bernard Karpel. Washington, DC, Smithsonian Institution Press, 1979. $190.00. 4 v. LC 79–15321. ISBN 0–87474–578–0. The publication of Arts…
Abstract
Arts in America: A Bibliography. Ed. by Bernard Karpel. Washington, DC, Smithsonian Institution Press, 1979. $190.00. 4 v. LC 79–15321. ISBN 0–87474–578–0. The publication of Arts in America: A Bibliography by the Smithsonian Institution Press should be greeted with enthusiasm not only by scholars of American art, but by anyone with an interest in bibliography in general. This compendium of mostly secondary materials is composed of four beautifully designed folio volumes which together list more than 25,000 entries. This bibliography will serve as an indispensable reference guide to a previously uncharted body of important cultural material. S. Dillon Ripley, Secretary of the Smithsonian, notes that “scholarship … begins with knowledge of previously published work …” (“Foreword”); Arts in America is a pioneer project designed with this goal in mind — to serve as a foundation upon which all future scholarship on the arts will depend.
Jenna McWilliams, Ian de Terte, Janet Leathem, Sandra Malcolm and Jared Watson
The Transformers programme is a community-based intervention for people with an intellectual disability (ID) who have emotion regulation difficulties, which can manifest as…
Abstract
Purpose
The Transformers programme is a community-based intervention for people with an intellectual disability (ID) who have emotion regulation difficulties, which can manifest as aggressive and challenging behaviour. The programme was adapted from the Stepping Stones programme (Oxnam and Gardner, 2011) – an emotion regulation programme for offenders with an ID who live in an inpatient setting. The purpose of this paper is to describe the development of the Transformers programme that has been implemented at an ID service, which provides secure and supervised care to people who have been convicted of an imprisonable offence or have high and complex behaviour needs.
Design/methodology/approach
The Transformers programme is delivered in weekly sessions over a six-month period in a group format. The focus is on helping group members to develop skills in recognising and understanding negative emotions and learning skills to cope effectively with such emotions. Treatment covers a variety of modules including relaxation, goal setting, chain analysis, emotion recognition, and emotion regulation. Specific strategies used include role-plays, DVDs, and quizzes.
Findings
This paper presents the rationale, developmental history, and description of a specific approach to the treatment of emotion regulation difficulties.
Originality/value
The paper aims to inform health professionals working in the field of ID.
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Zhuoyu Zhang, Lijia Zhong, Mingwei Lin, Ri Lin and Dejun Li
Docking technology plays a crucial role in enabling long-duration operations of autonomous underwater vehicles (AUVs). Visual positioning solutions alone are susceptible to…
Abstract
Purpose
Docking technology plays a crucial role in enabling long-duration operations of autonomous underwater vehicles (AUVs). Visual positioning solutions alone are susceptible to abnormal drift values due to the challenging underwater optical imaging environment. When an AUV approaches the docking station, the absolute positioning method fails if the AUV captures an insufficient number of tracers. This study aims to to provide a more stable absolute position visual positioning method for underwater terminal visual docking.
Design/methodology/approach
This paper presents a six-degree-of-freedom positioning method for AUV terminal visual docking, which uses lights and triangle codes. The authors use an extended Kalman filter to fuse the visual calculation results with inertial measurement unit data. Moreover, this paper proposes a triangle code recognition and positioning algorithm.
Findings
The authors conducted a simulation experiment to compare the underwater positioning performance of triangle codes, AprilTag and Aruco. The results demonstrate that the implemented triangular code reduces the running time by over 70% compared to the other two codes, and also exhibits a longer recognition distance in turbid environments. Subsequent experiments were carried out in Qingjiang Lake, Hubei Province, China, which further confirmed the effectiveness of the proposed positioning algorithm.
Originality/value
This fusion approach effectively mitigates abnormal drift errors stemming from visual positioning and cumulative errors resulting from inertial navigation. The authors also propose a triangle code recognition and positioning algorithm as a supplementary approach to overcome the limitations of tracer light positioning beacons.
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Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.
Abstract
Purpose
Reviews the latest management developments across the globe and pinpoints practical implications from cutting‐edge research and case studies.
Design/methodology/approach
This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context.
Findings
As marketers become increasingly adept in exposing us to advertising, consumers constantly need to ask: Are their advertisements truthful, do they obey government regulations – and do they annoy or please us?
Practical implications
Provides strategic insights and practical thinking that have influenced some of the world's leading organizations.
Originality/value
The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy‐to digest format.
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Promio Charles F., Raja Samikkannu, Niranjan K. Sura and Shanwaz Mulla
Ground vibration testing (GVT) results can be used as system parameters for predicting flutter, which is essential for aeroelastic clearance. This paper aims to compute GVT-based…
Abstract
Purpose
Ground vibration testing (GVT) results can be used as system parameters for predicting flutter, which is essential for aeroelastic clearance. This paper aims to compute GVT-based flutter in time domain, using unsteady air loads by matrix polynomial approximations.
Design/methodology/approach
The experimental parameters, namely, frequencies and mode shapes are interpolated to build an equivalent finite element model. The unsteady aerodynamic forces extracted from MSC NASTRAN are approximated using matrix polynomial approximations. The system matrices are condensed to the required shaker location points to build an aeroelastic reduced order state space model in SIMULINK.
Findings
The computed aerodynamic forces are successfully reduced to few input locations (optimal) for flutter simulation on unknown structural system (where stiffness and mass are not known) through a case study. It is demonstrated that GVT data and the computed unsteady aerodynamic forces of a system are adequate to represent its aeroelastic behaviour.
Practical implications
Airforce of every nation continuously upgrades its fleet with advanced weapon systems (stores), which demands aeroelastic flutter clearance. As the original equipment manufacturers does not provide the design data (stiffness and mass) to its customers, a new methodology to build an aeroelastic system of unknown aircraft is devised.
Originality/value
A hybrid approach is proposed, involving GVT data to build an aeroelastic state space system, using rationally approximated air loads (matrix polynomial approximations) computed on a virtual FE model for ground flutter simulation.
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L. Djayapertapa and C.B. Allen
Transonic flutter and active flap control, in two dimensions, are simulated by coupling independent structural dynamic and inviscid aerodynamic models, in the time domain. A…
Abstract
Transonic flutter and active flap control, in two dimensions, are simulated by coupling independent structural dynamic and inviscid aerodynamic models, in the time domain. A flight control system, to actively control the trailing edge flap motion, has also been incorporated and, since this requires perfect synchronisation of fluid, structure and control signal, the “strong” coupling approach is adopted. The computational method developed is used to perform transonic aeroelastic and aeroservoelastic calculations in the time domain, and used to compute stability (flutter) boundaries of 2D wing sections. Open and closed loop simulations show that active control can successfully suppress flutter and results in a significant increase in the allowable speed index in the transonic regime. It is also shown that active control is still effective when there is free‐play in the control surface hinge. Flowfield analysis is used to investigate the nature of flutter and active control, and the fundamental importance of shock wave motion in the vicinity of the flap is demonstrated.
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IT would be quite impossible adequately to report a Dublin conference of any kind in purely professional terms. The warm friendliness of its people demands an equally personal…
Abstract
IT would be quite impossible adequately to report a Dublin conference of any kind in purely professional terms. The warm friendliness of its people demands an equally personal reaction from its visitors and for public librarians certainly this is as it should be, because we are ourselves, above all, involved with people. So professional affairs at this conference were kept in their proper place—as only a part of the whole and merely providing a framework round which the business of renewing contacts and making friends could take place.