Search results for "Online"
showing 10 items of 4526 documents
Active disturbance rejection control of linear induction motor
2017
This paper proposes the theoretical framework and the experimental application of the active disturbance rejection control to linear induction motors. Such a nonlinear control (ADRC) technique can be viewed as a particular kind of input-output linearization control, where the nonlinear transformation of the state is not computed by means of the model, but it is estimated online. Such an approach permits to cope with unmodelling dynamics, as well as uncertainty in the knowledge of the model parameters and exogenous disturbances. The effectiveness of the proposed ADRC control law has been verified both by numerical simulations and experimentally on a suitably developed test setup. Moreover, t…
A cultural analysis of the visual signs in the Zapatistas websites
2012
A political movement initiated in Mexico known as Zapatism is analysed through the visual objects displayed in their websites on the Internet. The objective is to make a cultural analysis and interpretation of the visual representation of Zapatistas websites, to expose their visual identity through the most salient visual signs and their corresponding cultural meanings. The analytical method introduced in this study is divided in three major aims: consolidating a pool of images retrieved from Zapatistas websites, finding patterns of visual elements within these images, and providing an interpretation for the visual signs emerging from such patterns. In the analysis, three images emerged as …
What Prevents Consumers from Making Responsible Online Purchases?
2023
The objective of this qualitative study is to examine and describe what prevents consumers from making responsible online purchases. The data were collected during February and March 2023 with an online survey. The data comprises the respondents' (N=245) free-form written responses, in which they articulated and explained the factors that prevent their responsible online purchases. The findings indicate that external and internal factors can prevent consumers' responsible online purchases. While external factors – online stores – are mainly blamed for promoting irresponsible buying behavior, internal factors –consumers' individual characteristics – are also recognized to have an important r…
Online grocery shopping before and during the COVID-19 pandemic: A meta-analytical review.
2021
The COVID-19 pandemic has forced people to limit their physical interactions, which has led to explosive growth in online grocery shopping. However, there is no clear consensus in the retailing literature on whether consumers prefer to buy groceries online. The objective of this current study is to synthesize research about online grocery shopping published before and during the COVID-19 pandemic and to develop a conceptual framework about online grocery purchase intentions and their determinants, the mediation effects of consumers’ attitudes, the moderating effects of COVID-19, and control variables. The meta-analysis presents data derived from 50 independent samples with a sample size of …
Retoriskās iezīmes veselīgās ēdināšanas uzņēmumu interneta reklāmas rakstos
2022
Retorisko iezīmju lietojums pārliecināšanas nolūkā tiek praktizēts jau tūkstošiem gadu. Pirmās teorijas par ietekmēšanas rīkiem tika zinātniski klasificētas Senajā Grieķijā, kad filozofi raksturoja, ko nozīmē runāt ētiski, loģiski un pārliecinoši. Līdz pat šai dienai šo filozofu darbs tiek uzskatīts par pamatu retorikas zinātnei. Retorisko iezīmju klātbūtne valodā ir dabiska un visuresoša, tomēr mūsdienās tā ir plaši pielietota prakse dažādās nozarēs, ieskaitot reklāmdošanu. Šī darba mērķis ir pētīt retorisko iezīmju biežumu un dažādību veselīgo ēdināšanas kompāniju tiešsaistes reklāmrakstos. Diskursa analīze apstiprina, ka retorisko iezīmju lietojums mūsdienu reklāmrakstos ir plašs, daudzp…
Online expression and spending on personal cybersecurity
2019
The Internet is used increasingly as a platform both for free expression and e-commerce. Internet users have a variety of attitudes towards the security and privacy risks involved with using the Internet; and distinct concerns and behaviors with regard to expressing themselves online. Users may have controversial viewpoints that they may express online in various ways. Controversial viewpoints or artwork by their nature may not be as well received as positive or polite expressions. In the online environment, users with controversial viewpoints may be reluctant to express the viewpoints due to concern about possible consequences resulting from the expressions. Consequences may be imposed by …
Exploring positive online customer experience formation : a study of food waste shoppers
2022
This qualitative study investigates the formation of positive online customer experiences in the context of online grocery shopping. This study analyzes customers’ written descriptions of the causes of their positive experiences when visiting an online store. Data were collected with an online survey of 581 respondents. The case company is a Finnish online retailer, Fiksuruoka Ltd. Fiksuruoka’s business idea is to sell food waste; its product range consists of surplus groceries that are in danger of being disposed of. The findings show that four main themes contribute positively to the online customer experience. Positive customer experiences were explained by factors related to 1) the shop…
Nonlinear Absorption and Refraction of Picosecond and Femtosecond Pulses in HgTe Quantum Dot Films
2021
We report measurements of the saturated intensities, saturable absorption, and nonlinear refraction in 70-nm thick films containing 4 nm HgTe quantum dots. We demonstrate strong nonlinear refraction and saturable absorption in the thin films using tunable picosecond and femtosecond pulses. Studies were carried out using tunable laser pulses in the range of 400–1100 nm. A significant variation of the nonlinear refraction along this spectral range was demonstrated. The maximal values of the nonlinear absorption coefficients and nonlinear refractive indices determined within the studied wavelength range were −2.4 × 10−5 cm2 W−1 (in the case of 28 ps, 700 nm probe pulses) and −3 × 10−9 cm2 W−1 …
EMI Worsening in a SMPS with Non-linear Inductor
2022
This paper is focused on the input current in a Switched Mode Power Supply (SMPS) in which the power inductor is exploited up to the saturation showing a non-linear behaviour. The input current exhibits a distortion due to the non-linearity. The electromagnetic interference (EMI) caused by the ripple at switching frequency, superimposed to the DC value of the input current, requires a suitable design of the input differential mode (DM) filter. The input current is analyzed both in the time and frequency domain for different operating conditions, and it is compared to a SMPS equipped with a traditional linear inductor.
A New Development in Online Marketing: Introducing Digital Inbound Marketing
2015
This paper addresses the conceptualization, scale development and scale validation related to the study of consumer engagement in online settings. It first reviews this concept and draws attention to the multidimensionality of the construct, considering the underlying cognitive, emotional, and behavioral dimensions of consumer engagement. Then, it presents the foundation of this concept in relationship marketing and adds support to this proposition. Further, it proposes the construction and psychometric assessment of a 37 scales that examine all three dimensions, based on an international sample of 110 respondents who engage with a brand on a social media network. Based on multiple and succ…