scholarly journals ALGORITHMIZATION AND MOTION PROGRAMMING OF THE VACUUM CLEANER-ROBOT WITH PATH CORRECTION

2021 ◽  
Vol 35 (111) ◽  
pp. 8-17
Author(s):  
Lubov Melnikova ◽  
◽  
Kateryna Koval ◽  
Sergii Nichenko
Keyword(s):  
Vacuum Cleaner

The Hard Sell

2017 ◽  
Author(s):  
Peter Scott
Keyword(s):  
Price Competition ◽  
New Economy ◽  
The United States ◽  
Vacuum Cleaner ◽  
Firm Level ◽  
Direct Sales ◽  
Cost Distribution ◽  
Household Cleaning ◽  
Time Savings ◽  
Cleaning Methods

The vacuum cleaner was an archetypal new economy product of the early twentieth century. It offered both major time savings and qualitative advantages over previous household cleaning methods—the brush, broom, and manual carpet sweeper—and was sold in a novel way (by household demonstration). The direct sales techniques pioneered by vacuum manufacturers in the United States were to have a profound impact on the way vacuums were sold in Britain, and globally. Yet by 1939 their household diffusion was relatively slow compared to refrigerators or washing machines. This chapter explores why the industry evolved a structure based on high prices, high cost distribution methods (door-to-door sales), and a strong emphasis on non-price competition, based on differentiation through features. It also shows how door-to-door selling eventually came to constitute both a key firm-level competitive advantage and a substantial industry-level constraint on product diffusion.

Vacuum cleaner friction injuries in paediatrics. A 10 year review looking at national trends

Burns ◽  
2021 ◽  
Author(s):  
Karl Walsh ◽  
Mohamed Osman-Elabd ◽  
Zeeshan Sheikh ◽  
Ali Soueid
Keyword(s):  
Vacuum Cleaner ◽  
National Trends

Optimization of a vacuum cleaner fan suction and shaft power using Kriging surrogate model and MIGA

2021 ◽  
pp. 095765092110496
Author(s):  
Soheil Almasi ◽  
Mohammad Mahdi Ghorani ◽  
Mohammad Hadi Sotoude Haghighi ◽  
Seyed Mohammad Mirghavami ◽  
Alireza Riasi
Keyword(s):  
Optimization Design ◽  
Optimization Technique ◽  
Internal Flow ◽  
Latin Hypercube Sampling ◽  
Sample Space ◽  
Geometrical Parameters ◽  
Vacuum Cleaner ◽  
Time Saving ◽  
Design Variables ◽  
Shaft Power

Optimization of vacuum cleaner fan components is a low-cost and time-saving solution to satisfy the increasing requirement for compact energy-efficient cleaners. In this study, surrogate-based optimization technique is used and for the first time it is focused on maximization of Airwatt parameter, which describes the fan suction power, as an objective function (Case II). Besides, the shaft power is minimized (Case I) as another optimization target in order to reduce the power consumption of the vacuum cleaner. 11 geometrical variables of 3 fan components including impeller, diffuser and return channel are selected as the optimization design variables. 80 training points are distributed in the sample space using Advanced Latin Hypercube Sampling (ALHS) technique and the outputs of sample points are calculated by means of CFD simulations. Kriging and RSA surrogate models have been fitted to the outputs of the sample space. Through coupling of constructed Kriging models and Multi-Island Genetic Algorithm (MIGA), the optimal design for each of the optimization cases is presented and evaluated using numerical simulations. A 20.22% reduction in shaft power in Case I and an improvement of 27.73% in Airwatt in Case II have been achieved as the overall results of this study. Despite achieving goals in both optimization cases, a slight decrease in Airwatt in Case I (−6.20%) and a slight increase in shaft power in Case II (+4.82%) are observed relative to primary fan. Furthermore, the Analysis of Variance (ANOVA) determines the importance level of design variables and their 2-way interactions on the objective functions. It was concluded that geometrical parameters related to all of the fan components must be considered simultaneously to conduct a comprehensive optimization. The reasons of enhancement in optimal cases compared with the reference design have been further investigated by analysis of the fan internal flow field. Post-processing of the CFD results demonstrates that the applied geometrical modifications cause a more uniform flow through the flow passages of the optimal fan components.

scholarly journals Collaborative Coverage for a Network of Vacuum Cleaner Robots

2021 ◽  
pp. 112-115
Author(s):  
Junyan Hu ◽  
Barry Lennox ◽  
Farshad Arvin
Keyword(s):  
Vacuum Cleaner

scholarly journals An Analysis of Commissive Speech Act Used by The Shopping Hosts of MNC Shop

2019 ◽  
Vol 6 (1) ◽  
pp. 28
Author(s):  
Widdya Syafitri
Keyword(s):  
Speech Acts ◽  
Speech Act ◽  
Observational Method ◽  
Normal Pattern ◽  
Vacuum Cleaner ◽  
Distributional Method ◽  
Normal Sentence ◽  
The Subject ◽  
Permutation Technique ◽  
Sentence Subject

This research focuses on the use of commissive speech act used by the shopping hosts of MNC Shop. The source of data is taken from the advertisements of household appliances, such as frying pan, rice cooker, vacuum cleaner, etc which are broadcasted in December 2018. The purposes of the research are to identify and to explain the form and the pattern as well as the function of the commissive speech acts used by the shopping hosts. This research uses qualitative approach. The data are collected by using observational method followed by recording and note-taking technique. Then, the data are analyzed by using pragmatic identity method and distributional method with deletion and permutation technique. The theory of form and pattern of the commissive speech act are based on Alwi’s and Putrayasa’s theory. Meanwhile the theory of its function is taken from Yule’s and Ibrahim’s theory. From the analysis, it is found that the commissive speech acts in the advertisement can be uttered in the form of declarative, interrogative and exclamative. The pattern can be in the form of normal sentence (subject preceding the predicate then followed by the object) or in the form of inverted sentence (the inversion of normal pattern) which the predicate preceding the subject, etc. In terms of its functions, the commissive speech acts can be used to promise, to guarantee and to convince.

Sign in / Sign up

Export Citation Format

Share Document