Propeller thrust force contribution to airplane longitudinal stability

2018 ◽  
Vol 90 (9) ◽  
pp. 1474-1478
Author(s):  
Miodrag Milenković-Babić
Keyword(s):  
Stability Analysis ◽  
Thrust Force ◽  
Standard Procedure ◽  
Longitudinal Stability ◽  
Content Type ◽  
Additional Information ◽  
New Information ◽  
Practical Implications ◽  
Theoretical Results ◽  
Propeller Thrust

Purpose This paper aims to present the new information about propeller thrust force contribution to airplane longitudinal stability analysis. Design/methodology/approach The method presented in this paper is empirical, shows how propeller thrust force derivative can be obtained and gives some additional information about misinterpretation of the propeller thrust effects that are present in the current literature. Findings New information about propeller thrust force contribution to airplane longitudinal stability analysis has been presented. This information should enable more precise insight in aircraft stability analysis and better understanding of the physical process that occurs during maneuver flight. Practical implications The information presented in this paper is new and specific to the propeller aircraft configuration. The methods used here are standard procedure to evaluating propeller thrust force derivative. Originality/value The information in this paper presents theoretical results. The method for calculating thrust force contribution to the airplane longitudinal stability is given depending on the propeller type and should enable good engineering results.

Remarks about factors shaping the heliosphere

2018 ◽  
Vol 92 (3) ◽  
pp. 329-335
Author(s):  
Romana Ratkiewicz ◽  
Wojciech Konior ◽  
Jan Kotlarz
Keyword(s):  
Status Report ◽  
Physical Processes ◽  
Content Type ◽  
General Review ◽  
New Information ◽  
Conceptual Paper ◽  
First Time ◽  
Practical Implications ◽  
Theoretical Results

Purpose The purpose of the paper is to give a brief description of the new topic introduced for the first time at the EASN Conferences. Design/methodology/approach The topic concerns the heliosphere, the nearest surrounding of the Sun and thus the nearest vicinity of the Earth. The heliosphere is created due to the interaction between the solar wind and the local interstellar medium. Findings This paper does not include any new information about the heliosphere and only introduces a new topic to this journal. It is briefly shown how heliospheric structures are formed, what factors affect a shape of the heliosphere, what measurements are made by Ulysses, Voyager and IBEX space missions (important for the heliosphere modeling) and how obtained data are used to validate theoretical results. Practical implications To categorize the paper under one of these classifications, research paper, viewpoint, technical paper, conceptual paper, case study, literature review or general review, the authors chose a paper type, general review, as the closest category to this paper. However, it is not a purpose of this paper to provide an extensive review of the community efforts to investigate the physical processes in the vicinity of the heliosphere interface. This is mostly a status report. Originality/value As the new topic in this journal, the article introduces in detail only a small number of aspects connected with heliosphere models. Interplanetary and interstellar magnetic field structures are primarily described. Other factors are only mentioned.

Use of Salvia hispanica as an eco-friendly corrosion inhibitor for bronze in acid rain

2017 ◽  
Vol 64 (6) ◽  
pp. 654-663 ◽  
Author(s):  
A.K. Larios-Galvez ◽  
J. Porcayo-Calderon ◽  
V.M. Salinas-Bravo ◽  
J.G. Chacon-Nava ◽  
Jose Gonzalo Gonzalez-Rodriguez ◽  
...  
Keyword(s):  
Acid Rain ◽  
Corrosion Inhibitor ◽  
Electrochemical Impedance ◽  
Electrochemical Techniques ◽  
Simulated Acid Rain ◽  
Salvia Hispanica ◽  
Content Type ◽  
Green Corrosion Inhibitor ◽  
New Information ◽  
Practical Implications

Purpose The purpose of this research paper was to investigate the use of methanolic extract of Salvia hispanica (S. hispanica) as a green corrosion inhibitor for bronze in a simulated acid rain solution. Design/methodology/approach Extract of S. hispanica was used as a green corrosion inhibitor for bronze in simulated acid rain solution. Electrochemical techniques such as potentiodynamic polarization curves, electrochemical impedance spectroscopy and electrochemical noise were used. Parameters such as polarization, charge transfer and noise resistance (Rp, Rct and Rn, respectively) were calculated. Findings Results showed that the extract acts as a good, anodic type of inhibitor. The inhibitor efficiency increased with increasing its concentration up to 400 ppm, decreasing beyond this concentration. Efficiency also increased with an increase in the immersion time. The inhibition was due to the adsorption of components found in the S. hispanica extract following a Langmuir adsorption isotherm. Practical implications S. hispanica extract can be used as a corrosion inhibitor for bronze in acid rain solution. Originality/value This study provides new information on the inhibition features of S. hispanica under specific conditions. This eco-friendly inhibitor could find applications to protect bronze exposed to polluted urban atmospheres.

FDGM(1,1) model based on unified fractional grey generation operator

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wei Meng ◽  
Qian Li ◽  
Bo Zeng ◽  
Yingjie Yang
Keyword(s):  
Design Methodology ◽  
Simulation Method ◽  
Simple Expression ◽  
Fractional Operators ◽  
Modeling Error ◽  
Content Type ◽  
New Information ◽  
The Relationship ◽  
Special Case ◽  
Practical Implications

PurposeThe purpose of this paper is to unify the expression of fractional grey accumulating generation operator and the reducing generation operator, and build the FDGM(1,1) model with the unified fractional grey generation operator.Design/methodology/approachBy systematically studying the properties of the fractional accumulating operator and the reducing operator, and analyzing the sensitivity of the order value, a unified expression of the fractional operators is given. The FDGM(1,1) model with the unified fractional grey generation operator is established. The relationship between the order value and the modeling error distribution is studied.FindingsThe expression of the fractional accumulating generation operator and the reducing generation operator can be unified to a simple expression. For −1<r < 1, the fractional grey generation operator satisfies the principle of new information priority. The DGM(1,1) model is a special case of the FDGM(1,1) model with r = 1.Research limitations/implicationsThe sensitivity of the unified operator is verified through random numerical simulation method, and the theoretical proof was not yet possible.Practical implicationsThe FDGM(1,1) model has a higher modeling accuracy and modeling adaptability than the DGM(1,1) by optimizing the order.Originality/valueThe expression of the fractional accumulating generation operator and the reducing generation operator is firstly unified. The FDGM(1,1) model with the unified fractional grey generation operator is firstly established. The unification of the fractional accumulating operator and the reducing operator improved the theoretical basis of grey generation operator.

Commitment to change

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Keyword(s):  
Mixed Methods ◽  
Resistance To Change ◽  
Research Report ◽  
Mixed Methods Design ◽  
Commitment To Change ◽  
Content Type ◽  
Cultural Validity ◽  
Mixed Methods Approach ◽  
New Information ◽  
Practical Implications

Purpose The purpose of the study was to develop and validate an integrative measure of commitment to change using a mixed-methods approach. Changes in employees' commitment to change over time were examined. Design/methodology/approach This is a longitudinal study using participants in China. The researchers used a mixed-methods design. Findings Three hypotheses were supported: 1. Initial and later commitment to change were positively correlated 2. Commitment to change and change supportive behaviour was positively correlated 3. Initial commitment to change was negatively related to resistance to change. Research limitations/implications Construct clarification can be further examined across cultures to make its cross-cultural validity clearer. The research uses participants from a Chinese context and adds significantly to understanding of commitment to change in this culture. Practical implications Employers would do well to attend to the needs and interests of employees who have higher vocational commitment to change. Originality/value This research report gives data from participants from a Chinese cultural background which gives new information regarding vocational commitment to change and opens new areas for further research.

Alcohol versus sponsorship: effectiveness in sports posters

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Manuel Alonso Dos Santos ◽  
Maria Huertas-Serrano ◽  
Manuel J. Sánchez-Franco ◽  
Eduardo I. Torres-Moraga
Keyword(s):  
Eye Tracking ◽  
Purchase Intent ◽  
Sporting Events ◽  
Content Type ◽  
Academic Literature ◽  
New Information ◽  
Sports Sponsorship ◽  
Sponsorship Effectiveness ◽  
The Media ◽  
Practical Implications

PurposeThe academic literature debates the desirability of sponsoring alcohol products at sporting events, a discussion that increases as major sporting events approach. This study aims to examine the influence that sponsorship of an alcoholic product such as beer has on the sports spectator, and the level of efficacy with respect to congruent, alcohol, and incongruent sponsorship.Design/methodology/approachThe experiment was performed on 180 subjects considering three variables 3 × 3 × 2 (congruency type vs alcohol; sport discipline; placement). The experiment consisted of exposure to sponsored sports posters. Visual attention was recorded through eye tracking and then a self-reported questionnaire.FindingsThrough an experiment using eye tracking the results showed that the recall variable is higher among alcohol sponsorships and incongruent sponsorship, but it cannot be concluded either that the intention to buy or the attitude toward the brand differ among the sponsorships analyzed.Practical implicationsAlcohol brand is perceived as an incongruous brand in the context of sports sponsorship. Congruent sponsors attract more attention and recall, but no differences in terms of intention to buy. If purchase intent and consumption does not increase, perhaps sports sponsorship by alcohol brands should be reconsidered.Originality/valueThis research makes at least three relevant contributions to the scientific literature. (1) It examines the response to sponsorship in the media of the sports poster. (2) It analyses the consumer's response using neurophysiological means and provides new indicators in this area and (3) It compares performance indicators such as purchase intent, recall and brand attitude for alcoholic and non-alcoholic brand sponsors. These contributions could introduce new information about sponsorship performance.

Novel step-down topologies of star-connected autotransformer

Circuit World ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
JiaRong Wang ◽  
Bo He ◽  
XiaoQiang Chen
Keyword(s):  
Design Methodology ◽  
Voltage Regulation ◽  
Content Type ◽  
Harmonic Reduction ◽  
Modeling Analysis ◽  
Step Down ◽  
The Mathematical Model ◽  
Practical Implications ◽  
Theoretical Results ◽  
Equivalent Capacity

Purpose This paper aims to obtain a symmetrical step-down topology with lower equivalent capacity and wider step-down range under the condition of the same output. Two new symmetrical step-down topologies of star-connected autotransformers are proposed in this paper. Taking the equivalent capacity as the main parameter, the obtained topologies are modeled and analyzed in detail. Design/methodology/approach This paper adopts the research methods of design, modeling, analysis and simulation verification. First, the star-connected autotransformer is redesigned according to the design objective of symmetrical step-down topology. In addition, the mathematical model of two topologies is established and a detailed theoretical analysis is carried out. Finally, the theoretical results are verified by simulation. Findings Two symmetrical star-connected autotransformer step-down topologies are designed, the winding configurations of the corresponding topology are presented, the step-down ranges of these three topologies are calculated and the influence of step-down ratio on the equivalent capacity of autotransformer are analyzed. Through analysis, the target step-down topologies are obtained when the step-down ratio is [1.1, 5.4] and [1.1, 1.9] respectively. Research limitations/implications Because the selected research object is only a star-connected autotransformer, the research results may lack generality. Therefore, researchers are encouraged to further study the topologies of other autotransformers. Practical implications This paper includes the implications of the step-down ratio on the equivalent capacity of autotransformers and the configuration of transformer windings. Originality/value The topologies designed in this paper enable star-connected autotransformer in the 12-pulse rectifier to be applied in step-down circumstances rather than situations of harmonic reduction only. At the same time, this paper provides a way that can be used to redesign the autotransformer in other multi-pulse rectifier systems, so that those transformers can be used in voltage regulation.

Price promotions: examining the buyer mix and subsequent changes in purchase loyalty

2018 ◽  
Vol 35 (4) ◽  
pp. 366-376 ◽  
Author(s):  
John G. Dawes
Keyword(s):  
Design Methodology ◽  
Price Promotion ◽  
Price Promotions ◽  
Managerial Implication ◽  
Content Type ◽  
Packaged Goods ◽  
New Information ◽  
The Uk ◽  
Practical Implications ◽  
Normal Price

PurposeThis paper aims to investigate the extent to which temporary price promotions attract people who do not normally buy a brand, and whether buyers change their propensity to buy the promoted brand afterwards.Design/methodology/approachThe study analyses promotions in 18 consumer goods categories in the UK and USA. It calculates the proportion of promotion purchasers that have bought a brand at least once in their last five purchases and the Share of Category Requirements of those purchasers. These figures are then compared to normal-price purchasers.FindingsThe study finds the majority of price-promotion buyers already bought the brand at least once in their last five category purchases (average = 77 per cent). This figure is similar to that for normal-price purchases (average = 81 per cent). Average Household SCR to the brand is also very similar for price-promotion purchases compared to normal price purchases. Therefore, promotions do not attract a markedly different mix of buyers. Furthermore, buyer propensity to buy the brand is the same after a promotion purchase as it was before.Research limitations/implicationsA contribution of the paper is that it supports a theory of consumers as cognitive misers, who screen out promotion information about unfamiliar brands. The paper also highlights that in packaged-goods markets, consumers can be generally seen as experienced buyers, who do not learn new information from buying brands they have previously purchased.Practical implicationsThe managerial implication is that price promotions must be judged on their immediate profitability. There seems little recourse to the idea they can result in “try it, like it, buy it again later” effects.Originality/valueWhile many studies have examined the effects of price promotions, this is the first to explicitly compare the mix of buyers attracted from a price promotion to that which occurs when a brand is sold at normal price.

Collections, selection, access

2014 ◽  
Vol 115 (5/6) ◽  
pp. 263-271
Author(s):  
Aline Soules
Keyword(s):  
Design Methodology ◽  
Review Of The Literature ◽  
Future Directions ◽  
Content Type ◽  
New Information ◽  
Current Thinking ◽  
New Directions ◽  
Practical Implications ◽  
Review Current ◽  
New Strategies

Purpose – The purpose of this paper is to review current strategies in collections, selection and the access libraries provide, to present scenarios that illustrate the roles libraries are beginning to play and to discuss viable strategies for libraries in the future. Design/methodology/approach – An extensive review of the literature was conducted to identify current strategies in collections and selection, and to explore innovations in access strategies that reveal future directions. Findings – Librarians are redefining collections and selection, implementing new strategies to provide information that is more relevant to today’s needs, focusing more intently on niche collections and experimenting in access strategies to market information and increase use. Practical implications – Libraries’ survival depends on re-thinking the philosophy and approach to collections, selection and access. Social implications – Libraries need this shift in thinking and approach to find their place in the new information world. Originality/value – The paper provides an overview of current thinking in collections, selection and access, prompts thought about new directions in this area and provides a forum for discussion.

scholarly journals External constraints on Spanish municipal sports agencies’ finances

2016 ◽  
Vol 29 (2) ◽  
pp. 198-215 ◽  
Author(s):  
Jorge García-Unanue ◽  
José Luis Felipe ◽  
Carlos Gómez-González ◽  
Julio del Corral ◽  
Leonor Gallardo
Keyword(s):  
Performance Management ◽  
Service Provision ◽  
Regression Models ◽  
Local Level ◽  
Negative Influence ◽  
Positive Influence ◽  
Content Type ◽  
Additional Information ◽  
Financial Condition ◽  
Practical Implications

Purpose The purpose of this paper is to analyse the influence of the environment on the financial performance in public sports agencies at the local level. Design/methodology/approach The influence of the socio-demographic, socio-economic and political environment on the financial condition of municipal sports agencies in Spain from 2003 to 2011 was studied by several regression models. Findings The results show a negative influence of the size of the population and a positive influence of the municipal taxes per capita. The influence of the political context is not demonstrated. However, the set of variables only explain a small percentage of the variance. Research limitations/implications The main limitation of this study is the possible existence of other non-controlled environmental variables. However, this study approaches genuinely the effect of the environment on municipal sports agencies, which has important research implications as it shows additional information to be contrasted with other researches in different countries or regions. Practical implications The information provided in this study will be of great importance for managers to select more objectively other entities in benchmarking development. Originality/value Finally, this study uses a non-exploited database and redirects performance management studies to other areas of service provision such as sport.

Using CFD model of furnace for improvement of the quality of alumina-containing sinter

2014 ◽  
Vol 31 (1) ◽  
pp. 48-58 ◽  
Author(s):  
Alexander V. Aleksandrov ◽  
Valera V. Aleksandrov
Keyword(s):  
Stable State ◽  
Radiant Heat ◽  
Content Type ◽  
Cooling Conditions ◽  
New Information ◽  
Technical Solutions ◽  
First Time ◽  
Practical Implications ◽  
Fuel Burner

Purpose – The purpose of the study is to improve the quality of alumina-containing sinter produced in a rotary kiln. Simulating sintering furnace assessment of technical solutions aimed at creating optimal phase composition of clinker. Design/methodology/approach – The computer model of the sintering furnace is developed. Influence of characteristics of material streams on thermal processes in the furnace was considered. Balance of energy, including heat conductivity, convection and radiant heat exchange has been solved in a stable state. Between actual and calculated variables of work of the furnace, good correlation was observed. Findings – The evaluation of the effect of increasing primary air and fuel burner extension to changes in temperature of the material. The modeling found that the most effective solution to reduce the temperature of the sinter is lengthening fuel burner to 5 m. Practical implications – The model can be applied to analyze and optimize the alteration of temperatures of materials and gases in an industrial furnace under various conditions. Originality/value – The article provides new information for specialists in the production of alumina. For the first time shows the influence of cooling conditions on the alumina-containing sinter quality. According to the results of computer modeling, it has been established that for creating of optimal cooling conditions of the sinter in the furnace, the length of coal burner must be not less than 5 m.

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