scholarly journals DESIGN FEATURES OF RIVER-SEA CRUISE PASSENGER VESSELS FOR RUSSIAN INLAND WATERWAYS AND ADJACENT SEAS

2019 ◽  
Author(s):  
A G Egorov ◽  
G V Egorov ◽  
I A Ilnitskiy
Keyword(s):  
Comfort Level ◽  
Cfd Modelling ◽  
Hull Form ◽  
Inland Waterways ◽  
Living Space ◽  
New Concepts ◽  
Standard Module ◽  
Marine Engineering ◽  
Passenger Vessel ◽  
Passenger Cabin

New concepts of river-sea cruise passenger vessels are not only new vessels, but also new tourist product. In market of sea and river cruises there are practically no offers on earlier popular cruises between ports of Black, Mediterranean and Baltic, and Caspian seas. Thus, absence of offers is connected, first, with lack of river-sea cruise vessels. For the solution of problem of connection of sea and river routes modern cruise vessels of PV09, PV300 and PV300VD projects developed by Marine Engineering Bureau are offered. Researches have shown that generally for native conditions traditional single hull type passenger vessel can be recommended. CFD-modelling tests were executed to optimize hull form. Module principles of creating inner living space were used widely. Standard module cabins usage let alternate passenger capacity by using passenger cabin modules with different area in accordance with required comfort level.

scholarly journals A Model for Intact and Damage Stability Evaluation of CNG Ships during the Concept Design Stage

2019 ◽  
Vol 7 (12) ◽  
pp. 450 ◽  
Author(s):  
Francesco Mauro ◽  
Luca Braidotti ◽  
Giorgio Trincas
Keyword(s):  
Natural Gas ◽  
Design Process ◽  
Design Stage ◽  
Concept Design ◽  
Compressed Natural Gas ◽  
Hull Form ◽  
Intact Stability ◽  
Damage Stability ◽  
Marine Engineering ◽  
Feasible Solutions

To face the design of a new ship concept, the evaluation of multiple feasible solutions concerning several aspects of naval architecture and marine engineering is necessary. Compressed natural gas technologies are in continuous development; therefore, there are no available databases for existing ships to use as a basis for the design process of a new unit. In this sense, the adoption of a modern multi-attribute decision-based method can help the designer for the study of a completely new ship prototype. A database of compressed natural gas ships was generated starting from a baseline hull, varying six hull-form parameters by means of the design of experiment technique. Between the attributes involved in the concept design process, stability is for sure one of the most relevant topics, both for intact and damaged cases. This work describes two approaches to identify the compliance of a ship with the intact stability regulations based on the ship main geometrical quantities. Moreover, a metamodel based on the maximum floodable length concept (damage stability) allows determining the main internal subdivision of the ship. The metamodel outcomes were compared with results from direct calculations on a ship external to the database, highlighting the adequate accuracy given by the developed methods.

The Small Passenger Vessel

1985 ◽  
Vol 22 (04) ◽  
pp. 319-328
Author(s):  
Robert M. Cashman
Keyword(s):  
Historical Review ◽  
Regulatory Process ◽  
Hull Form ◽  
Regulatory Standards ◽  
Construction Of Self ◽  
Passenger Vessel ◽  
Design And Construction

This paper opens with a brief historical review and then discusses design and construction of self-propelled U.S.-flag passenger vessels from 50 to 200 ft in length. Technical topics include hydrodynamics, hull form, structure, weights, trim, subdivision, stability and machinery. A discussion of regulatory standards and the effect of the regulatory process on the industry is included.

scholarly journals Effect of tunnel on the resistance of high-speed planing craft

1970 ◽  
Vol 2 (1) ◽  
pp. 1-14 ◽  
Author(s):  
V Anantha Subramanian ◽  
PVV Subramanyam
Keyword(s):  
Pressure Distribution ◽  
High Speed ◽  
Hydrodynamic Effect ◽  
Hull Form ◽  
Planing Craft ◽  
Ship Hulls ◽  
Pressure Distributions ◽  
Pressure Development ◽  
Marine Engineering ◽  
Scaled Models

Tunnels are provided in ship hulls to accommodate propellers under reduced draught conditions, thereby avoiding reduction of propeller diameter and consequent loss of efficiency. In this work the hydrodynamic effect of propeller tunnels in high speed craft, by way of modified resistance and pressure distribution, are studied both numerically using CFD, and experimentally using geometrically scaled models. The experimental study has been conducted on the model of a single hard chine hull form designed for specific length to displacement ratio. The parametric study considers two other draught conditions. In order to bring out pressure influences, CFD based simulations have been carried out. It is noted that the pressure distributions are altered around the tunnel region and, for an investigated case of tunnel area ratio, there is consistent reduction of resistance for all the three draught conditions tested. The study also compares the merits of the modified Froude extrapolation method, after correction for flow velocity due to pressure development in the hull zone, with the classical Savitsky's method for planing hulls. The qualitative aspects with respect to pressure distribution are brought out in the CFD based studies and the pressure predictions do show consistency with obtained experimental data. Keywords: High speed planing craft, Tunnels, Resistance, Extrapolation methods, Pressure distribution, CFD Studies. doi: 10.3329/jname.v2i1.2025 Journal of Naval Architecture and Marine Engineering 2(1)(2005) 1-14

Novel Approaches to Low-Voltage Scanning Electron Microscopy

1990 ◽  
Vol 48 (1) ◽  
pp. 366-367
Author(s):  
Arthur V. Jones
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Low Voltage ◽  
Electron Optics ◽  
Current Interest ◽  
New Concepts ◽  
Opportune Time ◽  
Novel Approaches ◽  
Voltage Scanning ◽  
Scanning Electron

In comparison with the developers of other forms of instrumentation, scanning electron microscope manufacturers are among the most conservative of people. New concepts usually must wait many years before being exploited commercially. The field emission gun, developed by Albert Crewe and his coworkers in 1968 is only now becoming widely available in commercial instruments, while the innovative lens designs of Mulvey are still waiting to be commercially exploited. The associated electronics is still in general based on operating procedures which have changed little since the original microscopes of Oatley and his co-workers.The current interest in low-voltage scanning electron microscopy will, if sub-nanometer resolution is to be obtained in a useable instrument, lead to fundamental changes in the design of the electron optics. Perhaps this is an opportune time to consider other fundamental changes in scanning electron microscopy instrumentation.

Speech-Language Pathologists' Comfort Level With Use of Term “Stuttering” During Evaluations

2020 ◽  
Vol 29 (2) ◽  
pp. 841-850 ◽  
Author(s):  
Courtney T. Byrd ◽  
Danielle Werle ◽  
Kenneth O. St. Louis
Keyword(s):  
Communication Disorders ◽  
Academic Experiences ◽  
Comfort Level ◽  
Future Research ◽  
Clinical Experiences ◽  
Speech Language Pathologists ◽  
Comfort Levels ◽  
Parents And Children ◽  
Evaluation Feedback ◽  
Study Participants

Purpose Speech-language pathologists (SLPs) anecdotally report concern that their interactions with a child who stutters, including even the use of the term “stuttering,” might contribute to negative affective, behavioral, and cognitive consequences. This study investigated SLPs' comfort in providing a diagnosis of “stuttering” to children's parents/caregivers, as compared to other commonly diagnosed developmental communication disorders. Method One hundred forty-one school-based SLPs participated in this study. Participants were randomly assigned to one of two vignettes detailing an evaluation feedback session. Then, participants rated their level of comfort disclosing diagnostic terms to parents/caregivers. Participants provided rationale for their ratings and answered various questions regarding academic and clinical experiences to identify factors that may have influenced ratings. Results SLPs were significantly less likely to feel comfortable using the term “stuttering” compared to other communication disorders. Thematic responses revealed increased experience with a specific speech-language population was related to higher comfort levels with using its diagnostic term. Additionally, knowing a person who stutters predicted greater comfort levels as compared to other clinical and academic experiences. Conclusions SLPs were significantly less comfortable relaying the diagnosis “stuttering” to families compared to other speech-language diagnoses. Given the potential deleterious effects of avoidance of this term for both parents and children who stutter, future research should explore whether increased exposure to persons who stutter of all ages systematically improves comfort level with the use of this term.

School-Based Speech-Language Pathologists' Perceived Self-Efficacy in Conducting Multidimensional Treatment With Children Who Stutter

2020 ◽  
Vol 51 (4) ◽  
pp. 1172-1186
Author(s):  
Carolina Beita-Ell ◽  
Michael P. Boyle
Keyword(s):  
Self Efficacy ◽  
Clinical Training ◽  
Online Survey ◽  
The United States ◽  
Comfort Level ◽  
Social Emotional ◽  
Speech Language Pathologists ◽  
Fluency Disorders ◽  
Cognitive Components ◽  
School Based

Purpose The purposes of this study were to examine the self-efficacy of school-based speech-language pathologists (SLPs) in conducting multidimensional treatment with children who stutter (CWS) and to identify correlates of self-efficacy in treating speech-related, social, emotional, and cognitive domains of stuttering. Method Three hundred twenty randomly selected school-based SLPs across the United States responded to an online survey that contained self-efficacy scales related to speech, social, emotional, and cognitive components of stuttering. These ratings were analyzed in relation to participants' beliefs about stuttering treatment and their comfort level in treating CWS, perceived success in therapy, and empathy levels, in addition to their academic and clinical training in fluency disorders as well as demographic information. Results Overall, SLPs reported moderate levels of self-efficacy on each self-efficacy scale and on a measure of total self-efficacy. Significant positive associations were observed between SLPs' self-efficacy perceptions and their comfort level in treating CWS, self-reported success in treatment, beliefs about the importance of multidimensional treatment, and self-reported empathy. There were some discrepancies between what SLPs believed was important to address in stuttering therapy and how they measured success in therapy. Conclusions Among school-based SLPs, self-efficacy for treating school-age CWS with a multidimensional approach appears stronger than previously reported; however, more progress in training and experience is needed for SLPs to feel highly self-efficacious in these areas. Continuing to improve clinician self-efficacy for stuttering treatment through improved academic training and increased clinical experiences should remain a high priority in order to enhance outcomes for CWS. Supplemental Material https://doi.org/10.23641/asha.12978194

New Concepts in Congenital Deafness

1971 ◽  
Vol 4 (2) ◽  
pp. 431-443
Author(s):  
LaVonne Bergstrom ◽  
Janet Stewart
Keyword(s):  
Congenital Deafness ◽  
New Concepts

symbolizes new concepts in sulfonation

1958 ◽  
Vol 36 (20) ◽  
pp. 4
Keyword(s):  
New Concepts
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