bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of Densitometric and Geometric Parameters of the Femur in 14-Month-Old Ostriches Depending on Sex with the Use of Computed Tomography
Authors: Charuta Anna 
Published: May 2018

Abstract
The aim of the study was to analyse densitometric and geometric parameters of the compact bone and the trabecular diaphysis of the femur of ostriches with the use of computed tomography. The method has been applied in ostriches for the first time. The study was conducted on the femur of 14-month-old ostriches of both sexes. The obtained results were analysed statistically using one-way ANOVA, with Bonferroni correction for multiple-group comparisons. It was stated that the mineral content (BMC) in the middle of the diaphysis of the femur was significantly higher in males (465.52 mg/mm) than in females (417.67 mg/mm). Similar tendencies were observed for the total bone area (TOT_ A), trabecular area (TRAB_ A), cortical area (CRT_ A), and strength strain index (SSI). The average area of the CRT_A for both sexes was 568.62 mm2 and was lower than the TRAB_A - 884 mm2, at P≤0.05. Moreover, it was found that strength strain index (SSI) of the diaphysis depended on the TOT_A and the TRAB_A. Both features positively correlated with SSI. Pearson’s correlation coefficient for both features was r = 0.97, at P≤0.01. Further research concerning the dynamics of changes of densitometric and geometric parameters occurring with age and involving both sexes is recommended, as there are many locomotion problems in ostriches, especially older ones, used intensively on farms for many years.
Magnetoconvection in a plane layer rotating about the horizontal axis: The effect of anisotropic diffusivities
Authors: Šoltis Tomáš , Brestenský Jozef 
Published: May 2018

Abstract
A linear stability analysis of convection arising in a horizontal plane layer rotating about the horizontal axis and permeated by a homogeneous horizontal magnetic field perpendicular to the rotation axis is performed. Resulting horizontal convective rolls are inclined to the magnetic field at an angle dependent on the dimensionless numbers − the Elsasser, Ekman and Roberts numbers, and moreover on the anisotropy parameter, the ratio of horizontal and vertical diffusion coefficients (which are the viscosity and thermal diffusivity; magnetic diffusivity is considered isotropic).
Two types of anisotropies, SA andBM, are considered and compared with the isotropic case of diffusion coefficients. In the stratification anisotropy, SA, of the Sa and So types, diffusivities in the horizontal directions are, respectively, smaller and greater than the vertical ones. In the BM anisotropy (Braginsky and Meytlis, 1990), the diffusivities in the directions of rotation axis and magnetic field - in the horizontal directions are greater than in vertical direction, thus identically as in So type anisotropy. Results of this H case, the model with the horizontal rotation axis, are compared with the V case of a similar model with the vertical rotation axis. The modes of instabilities are much more sensitive to viscosity and various anisotropies in the H case than in the V case.
Results indicate that the effects of anisotropic diffusivities on the Earth’s core magnetoconvection and geodynamo processes should be studied more thoroughly in simpler models than is usually done.
Differential and Common Mode Noise Waves and Correlation Matrices
Authors: Dobrowolski Janusz A. 
Published: May 2018

Abstract
This paper presents an innovative extention of the noise wave definition to mixed mode, differential - and commonmode noise waves which can be used for noise analysis of differential microwave networks. Mixed mode noise waves are used next to define generalized mixed mode noise wave correlation matrices of microwave multiport networks. Presented approach may be used for noise analysis of microwave differential networks with differential ports as well as with conventional single ended ports.
AP-MOVPE Technology and Characterization of InGaAsN p-i-n Subcell for InGaAsN/GaAs Tandem Solar Cell
Authors: Dawidowski Wojciech , Šciana Beata , Zborowska-Lindert Iwona , Mikolášek Miroslav , Latkowska Magdalena , Radziewicz Damian , Pucicki Damian , Bielak Katarzyna , Badura Mikołaj , Kováč Jaroslav , Tłaczała Marek 
Published: May 2018

Abstract
Tandem (two p-n junctions connected by tunnel junction) and multijunction solar cells (MJSCs) based on AIIIBV semiconductor compounds and alloys are the most effective photovoltaic devices. Record efficiency of the MJSCs exceeds 44% under concentrated sunlight. Individual subcells connected in series by tunnel junctions are crucial components of these devices. In this paper we present atmospheric pressure metal organic vapour phase epitaxy (AP-MOVPE) of InGaAsN based subcell for InGaAsN/GaAs tandem solar cell. The parameters of epitaxial structure (optical and electrical), fabrication process of the test solar cell devices and current-voltage (J-V) characteristics are presented and discussed.
Nonlinear Optimal Tracking For Missile Gimbaled Seeker Using Finite-Horizon State Dependent Riccati Equation
Authors: Khamis Ahmed , Naidu D. Subbaram , Kamel Ahmed M. 
Published: May 2018

Abstract
The majority of homing guided missiles use gimbaled seekers. The equations describing seeker gimbal system are highly nonlinear. Accurate nonlinear control of the motion of the gimbaled seeker through the attached DC motors is required. In this paper, an online technique for finite-horizon nonlinear tracking problems is presented. The idea of the proposed technique is the change of variables that converts the nonlinear differential Riccati equation to a linear Lyapunov differential equation. The proposed technique is effective for wide range of operating points. Simulation results for a realistic gimbaled system with different engagement scenarios are given to illustrate the effectiveness of the proposed technique.
Learners’ Perceptions on the Structure and Usefulness of e-Resources for the Thesis Courses
Authors: Aghaee Naghmeh , Hansson Henrik , Tedre Matti , Drougge Ulrika 
Published: May 2018

Abstract
The use of information and communication technology (ICT) in education is a way to facilitate interaction and accessing information for learning in higher education. However, finding a set of structured e-resources to facilitate learning within specific courses is still a big challenge in most higher education institutions. This includes the problems and challenges for thesis courses in both undergraduate (Bachelor) and graduate (Master) level in Sweden. To overcome or reduce the problems and enhance quality of outcomes in thesis courses, the department of Computer and Systems Sciences (DSV) at Stockholm University has developed a Learning Support System, SciPro (Scientific Process), to support the thesis process. The aim of this study is to investigate learners’ perspectives on the usefulness of structured e-resources in SciPro, to reduce challenges for finding information related to the thesis process. This was done based on an open online survey, carried out in 2012-2013 of students’ perspectives at DSV. The study found the actual problems that students have encountered in the thesis courses and hence suggested a general model as a way forward to sort the e-resources to reduce the problems in the thesis process.
Do Referral Programs Increase Profits
Authors: Schmitt Philipp , Skiera Bernd , Bulte Christophe Van den 
Published: May 2018

Abstract
Marketers increasingly use word of mouth to promote products or acquire new customers. But is such companystimulated WOM effective? Are customers who are referred by other customers really worth the effort? A recent study clearly says “yes”. In a study of almost 10,000 accounts at a German bank, the referred customers turned out to be 25 % more profi table than customers acquired by other means. Over a 33-month period, they generated higher profi t margins, were more loyal and showed a higher customer lifetime value. The difference in lifetime value between referred and non-referred customers was most pronounced among younger people and among retail (as opposed to private banking) customers. The reward of € 25 per acquired customer clearly paid off. Given the average difference in customer lifetime value of € 40, this amount implied a return on investment (ROI) of roughly 60 % over a six-year period. The encouraging results of this study, however, do not imply that “viral-for-hire” works in each and every case. Referral programs would be most beneficial for products and services that customers might not appreciate immediately. Products and services that imply some kind of risk would also benefit to a more than average degree from referrals because prospects are likely to feel more confi dent when a trusted person has positive experiences. Companies should consider carefully which prospects to target with referral programs and how large a referral fee to provide.
To Close or not to Close? Assessing the Impact of Outlet Closures on Retail Chains
Authors: Haans Hans , Gijsbrechts Els 
Published: May 2018

Abstract
Retail chains often face tough competition and permanently seek to increase profitability. Closing outlets is a common strategy, even if knowledge about its implications is limited. Indeed, chain sales losses from store closure of a multi-outlet retailer operating multiple formats vary widely across outlets (ranging from less than 30 % to more than 80 % of the closed outlet’s revenue) and depend not only on the closed store’s format and distance to competitors, but also on the profile of its clientele and type of shopping trip. Analyzing these criteria helps to predict the magnitude of these losses for specific store closures using a new model. It offers guidance to retailers in deciding whether a particular store closure is beneficial to the chain or, if the objective is to prune an overly dense network, which of a set of local outlets is the best candidate for closure
Measuring Consumers’ Willingness to Pay. Which Method Fits Best?
Authors: Miller Klaus M. , Hofstetter Reto , Krohmer Harley , Zhang Z. John 
Published: May 2018

Abstract
Gauging the maximum willingness to pay (WTP) of a product accurately is a critical success factor that determines not only market performance but also financial results. A number of approaches have therefore been developed to accurately estimate consumers’ willingness to pay. Here, four commonly used measurement approaches are compared using real purchase data as a benchmark. The relative strengths of each method are analyzed on the basis of statistical criteria and, more importantly, on their potential to predict managerially relevant criteria such as optimal price, quantity and profit. The results show a slight advantage of incentive-aligned approaches though the market settings need to be considered to choose the best-fitting procedure
“Call. Mail. Shoot. Listen. Play” But What Functionalities Add Real Value in Convergent Products?
Authors: Gill Tripat 
Published: May 2018

Abstract
It is very common to add diverse new functionalities to existing base products (e.g., adding mobile television to a cell phone or internet access to a personal digital assistant). These convergent products offer users a broad choice of potential applications. However, it is not clear what additions are actually valued by consumers, and therefore also make sense from a manufacturer’s perspective. The current research addresses this very issue. It investigates the role of three factors on the evaluation of such convergent products (CPs); namely, (1) the consumption goal (utility versus fun-oriented) associated with the base product and the added functionality, (2) the prior ownership of the base product, and (3) the quality of the brand introducing the new functionality. In three experimental studies, the author explores the effect of each of the above three factors in the evaluation of CPs. On the basis of the results he presents some guidelines on how to extend existing products to create more value for consumers and manufacturers
Proving Marketing Success Pays Off! Marketing Performance Measurement and its Effects on Marketing’s Stature and Firm Success
Authors: O’Sullivan Don , Abela Andrew V. 
Published: May 2018

Abstract
It has been widely argued that an inability to account for marketing’s contribution has undermined its standing within the company. Furthermore, the effect of marketing activities on business success is underestimated. To respond to this pressure, marketers are investing in the development of performance measurement abilities. In this study of senior marketing managers in high-tech firms, the effect of the ability to measure marketing performance against business performance is examined. The authors also explore the effect of the ability to measure marketing against marketing’s status within the company. Results indicate that this ability is essential given that it has a significant impact on company performance, profitability, stock returns, and marketing’s stature within the company. Considering these effects, the closing managerial implications are highly relevant for marketing professionals
Trying Harder and Doing Worse: How Grocery Shoppers Track in-Store Spending
Authors: van Ittersum Koert , Pennings Joost M.E , Wansink Brian 
Published: May 2018

Abstract
All over the world the economic crisis has raised the number of households which are below the poverty line. A careful tracking of expenditures has become increasingly necessary to avoid financial distress. Models of spending behavior often implicitly assume that budget shoppers know how much they spend while shopping. As demonstrated here, this assumption is the exception rather than the rule
All Customers are Equal, but Some are More Equal Should Firms Prioritize their Customers ?
Authors: Homburg Christian , Totzek Dirk , Droll Mathias 
Published: May 2018

Abstract
Focusing marketing efforts on the most valuable customers so as to increase company profits is not as straightforward as it seems. There is a downside to customer prioritization such as negative reaction from low priority customers. Taking this into account we still show that prioritizing customers does lead to higher profitability and more return on sales. There are two reasons for this. Firstly, it has a positive effect on the key characteristics of a firm’s relationship with its elite customers while not affecting the lower level. Secondly, it reduces sales and marketing costs. Customer prioritization is more effective and efficient than equal treatment. We also show that firms can rely on six key levers relating to a company’s organizational structure and processes, enabling proper implementation of customer prioritization.
Getting Marketing back into the boardroom: The influence of the marketing department in companies today
Authors: Verhoef Peter C. , Leeflang Peter S.H. 
Published: May 2018

Abstract
What influence do marketing departments have in companies today? Which factors determine this influence? These are the issues discussed in the present article. Empirical evidence based on data from companies in the Netherlands demonstrates that accountability, innovativeness and customer connections are the three major drivers of influence. The need for a strong marketing department within companies is also discussed, supported by empirical data.
My customers are better than yours! On Reporting Customer Equity
Authors: Wiesel Thorsten , Skiera Bernd , Villanueva Julián 
Published: May 2018

Abstract
Managers and investors need information about the performance and future prospects of a firm. If information is relevant in steering a business, it is also relevant for its investors’ investment decisions. Recent initiatives demand information that supplements and complements a firm’s financial statements to bridge the gap between financial statement capabilities and financial reporting objectives. Firms that aim to increase the value of their customer base should manage their business by future-oriented customer metrics. They should also report this information externally because it aligns customer management with corporate goals and investors’ perspectives. The authors propose a means to report customer equity that enables monitoring firms’ performance with respect to their customer assets. Furthermore, they develop a specific model for Netflix and apply it to quarterly reports that cover more than six years.
Comparative study of long-term water uptake of Norway spruce and Douglas-fir in Moravian upland
Authors: Nadezhdina Nadezhda , Urban Josef , Čermák Jan , Nadezhdin Valeriy , Kantor Petr 
Published: May 2018

Abstract
Long-term water uptake of Douglas-fir and Norway spruce trees, growing in condition of Moravian upland, was studied with aim of comparing sap flow in small roots with flow in stems. Sap flow was measured by the heat field deformation method using multi-point sensors for stems and single-point sensors for roots. Differences between species were found in relationships between sap flow in tree stems and water uptake by roots, suggesting that Douglas-fir is able to take water from deeper soil more efficiently than spruce. This allows Douglas-fir to transpire more water especially during drought and grow faster than spruce. These biological features should be taken into account for future forest species compositions because they may have impact on both, forestry and hydrology.
Modelling the impact of increasing soil sealing on runoff coefficients at regional scale: a hydropedological approach
Authors: Ungaro Fabrizio , Calzolari Costanza , Pistocchi Alberto , Malucelli Francesco 
Published: May 2018

Abstract
Soil sealing is the permanent covering of the land surface by buildings, infrastructures or any impermeable artificial material. Beside the loss of fertile soils with a direct impact on food security, soil sealing modifies the hydrological cycle. This can cause an increased flooding risk, due to urban development in potential risk areas and to the increased volumes of runoff. This work estimates the increase of runoff due to sealing following urbanization and land take in the plain of Emilia Romagna (Italy), using the Green and Ampt infiltration model for two rainfall return periods (20 and 200 years) in two different years, 1976 and 2008. To this goal a hydropedological approach was adopted in order to characterize soil hydraulic properties via locally calibrated pedotransfer functions (PTF). PTF inputs were estimated via sequential Gaussian simulations coupled with a simple kriging with varying local means, taking into account soil type and dominant land use. Results show that in the study area an average increment of 8.4% in sealed areas due to urbanization and sprawl induces an average increment in surface runoff equal to 3.5 and 2.7% respectively for 20 and 200-years return periods, with a maximum > 20% for highly sealed coast areas.
Improved higher lead time river flow forecasts using sequential neural network with error updating
Authors: Prakash Om , Sudheer K.P. , Srinivasan K. 
Published: May 2018

Abstract
This paper presents a novel framework to use artificial neural network (ANN) for accurate forecasting of river flows at higher lead times. The proposed model, termed as sequential ANN (SANN), is based on the heuristic that a mechanism that provides an accurate representation of physical condition of the basin at the time of forecast, in terms of input information to ANNs at higher lead time, helps improve the forecast accuracy. In SANN, a series of ANNs are connected sequentially to extend the lead time of forecast, each of them taking a forecast value from an immediate preceding network as input. The output of each network is modified by adding an expected value of error so that the residual variance of the forecast series is minimized. The applicability of SANN in hydrological forecasting is illustrated through three case examples: a hypothetical time series, daily river flow forecasting of Kentucky River, USA and hourly river flow forecasting of Kolar River, India. The results demonstrate that SANN is capable of providing accurate forecasts up to 8 steps ahead. A very close fit (>94% efficiency) was obtained between computed and observed flows up to 1 hour in advance for all the cases, and the deterioration in fit was not significant as the forecast lead time increased (92% at 8 steps ahead). The results show that SANN performs much better than traditional ANN models in extending the forecast lead time, suggesting that it can be effectively employed in developing flood management measures.
Models of Air Missions / Modele Misji Lotniczych
Authors: Cwojdziński Leszek , Lewitowicz Jerzy , Żyluk Andrzej 
Published: May 2018

Abstract
Combat missions of both a single multi-role aircraft and a group of aircraft. Compatibility and readiness - properties determining accomplishment of an air operation. Scenarios of air operations. Models of air-to-air and air-to-surface operations (AAO and ASO, respectively). Computer modelling of air missions.
The Optimization of Replacement Time for Non-Repairable Aircraft Component / Wyznaczanie Optymalnego Czasu Wymiany Nieodnawialnego Komponentu Samolotu
Authors: Kustroń Kamila , Cieślak Łukasz 
Published: May 2018

Abstract
This paper presents the procedure to be followed in order to determine the optimal time of non-repair component of the air operator's aircraft fleet. This problem is very important because of the losses that may occur as a result of too late the decision to replace and the damaged might occur during the operation of the airplane. On the other hand, the operator suffers losses because of too frequent replacements. These losses are generated by very early replacement of the efficient equipment and in addition generate excessive workload sharing on its assessment, the impact of human factors and increase the aircraft downtime. There is thus an optimal solution for which the objective function is to maximize the technical and operational readiness expressing the ratio of aircraft downtime and the time of its use as intended uptime with minimal costs. The optimal condition for the data component of the failure rate was determined and presented in this paper. The resulting replace component of the optimal interval must then be correlated with other work to do on an airplane as Maintenance Programme - MP.
The Design Technology Development of Prospective Airframe in View of the Operation&Maintenance Experience and Technology Development / Rozwój Technik Projektowania Przyszłościowych Płatowców W Aspekcie Doświadczenia Eksploatacyjnego I Rozwoju Techniki I Technologii
Authors: Kustroń Kamila 
Published: May 2018

Abstract
The paper presents forward-looking approach to airframe design and development by integrated design philosophy with the philosophy of sustainability management service in terms of quality, taking into account the whole life cycle of the aircraft and the interactions between the different phases. The approach has been presented pro-quality. The determinants of quality and relationships has been identified. The concept of an advisory system logistics support airframe design using artificial intelligence methods.