scholarly journals Cutting Tests of the Outer Layer of Material Using Onion as an Example

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2360
Author(s):  
Andrzej Bochat ◽  
Marcin Zastempowski ◽  
Marcin Wachowicz

This paper describes experimental research on cutting the outer layer of onions in the machine peeling process. The authors’ own globally innovative modular machine construction was used for this purpose. The onion peeling machine was constructed on a real scale. The effectiveness of the machine’s functioning Se was defined as the ratio of the mass of material correctly removed by the scale blower mp to the mass of all material leaving the machine on the test bench mc. In order to carry out the experimental research, a test stand was constructed, a research plan and programme were adopted, and the research methodology was developed. The results obtained during the experimental research and the data obtained from the regression function equations for the developed design of the onion peeling machine were used to build systems of independent variables, for which the dependent variable Se reached extreme values. The effectiveness of the machine’s operation Se of modular construction increased with the increase in the depth of the external incisions of the shells dn, the number of scale-blowing nozzles, and the pressure of the air supply to the scale-blowing unit p. Increasing the material feed rate vp and the distance of the air nozzles from the material to be processed hd reduced the machine’s efficiency Se. The tests carried out showed a high level of efficiency on the level of Se=0.645−0.780, which is not found in mass-produced machines.

VLSI Design ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-17
Author(s):  
Soumya Pandit ◽  
Chittaranjan Mandal ◽  
Amit Patra

This paper presents a systematic methodology for the generation of high-level performance models for analog component blocks. The transistor sizes of the circuit-level implementations of the component blocks along with a set of geometry constraints applied over them define the sample space. A Halton sequence generator is used as a sampling algorithm. Performance data are generated by simulating each sampled circuit configuration through SPICE. Least squares support vector machine (LS-SVM) is used as a regression function. Optimal values of the model hyper parameters are determined through a grid search-based technique and a genetic algorithm- (GA-) based technique. The high-level models of the individual component blocks are combined analytically to construct the high-level model of a complete system. The constructed performance models have been used to implement a GA-based high-level topology sizing process. The advantages of the present methodology are that the constructed models are accurate with respect to real circuit-level simulation results, fast to evaluate, and have a good generalization ability. In addition, the model construction time is low and the construction process does not require any detailed knowledge of circuit design. The entire methodology has been demonstrated with a set of numerical results.


2014 ◽  
Vol 224 ◽  
pp. 226-231
Author(s):  
Michał Burak ◽  
Dariusz Skibicki ◽  
Michał Stopel

This paper presents procedures to be used for development of an experiment plan which is supposed to provide the tested structure with operating conditions most similar to those in real life. The research object is an air handling unit subjected to random loading such as earthquakes.


2013 ◽  
Vol 371 ◽  
pp. 235-239
Author(s):  
Dumitru Soaita

EDM is presently known as the best available technology (BAT) to solve various problems in machine construction. This paper attempts to provide some answers to the question - is EDM a clean technology? Working methodology consisted in processing literature data and data obtained from authors experimental research on the environmental impact of EDM. In conclusion, there are several issues to be solved before EDM can be considered a clean technology. The article also suggests solutions for these problems.


2016 ◽  
Vol 27 (2) ◽  
pp. 205-218 ◽  
Author(s):  
Andrius Jurelionis ◽  
Laura Stasiuliene ◽  
Tadas Prasauskas ◽  
Dainius Martuzevicius

The usage of floor heating is increasing in low-energy buildings as it enables efficient applications of low-exergy level heat sources as well as provides a uniform distribution of air temperature and low air velocities in heated spaces. The aim of this study was to analyse the effects of floor heating on the dispersion of gaseous pollutants emitted at the floor level, considering that carpets and flooring materials can be sources of such pollution. Mixing ventilation with high-level wall grille air supply and in-ceiling four-way air supply was tested numerically and experimentally in the full-scale chamber at the air change rate of 2 h−1. Three positions of a heated dummy in relation to the pollution source, cold surface and air supply diffusers were analysed. Both experiments and CFD predictions revealed the overall positive effect of floor heating on ventilation effectiveness and personal exposure. Floor heating increased pollutant removal effectiveness by 5% and reduced personal exposure by 22% on average.


2020 ◽  
Vol 34 (4) ◽  
pp. 78-86
Author(s):  
Byeongjun Kim ◽  
Ying Yan ◽  
Weon Gyu Shin

In this study, numerical simulations were performed on the air egress velocity of pressurization systems in an ancillary room when a fire occurred in an apartment house. The relationship between the air supply flow rate of a damper and air egress velocity at a fire door is predicted to be linear. Additionally, a minimum flow rate of the damper, which meets national fire safety standards for air egress velocity, i.e., 0.7 m/s can be estimated. Air egress velocity at the fire door is analyzed according to the supply air direction and installation height of the damper. When the damper has an upward supply air direction and is installed at a high level, the egress velocity at the top section of the fire door is larger, whereas the soot concentration at the ancillary room is lower than when the supply direction of the damper is downward. Therefore, it is found that increasing the air egress velocity at the top section of the fire door helps to efficiently prevent the inflow of smoke.


2012 ◽  
Vol 188 ◽  
pp. 185-192 ◽  
Author(s):  
Laurentiu Roland Cucuruz ◽  
Mircea Nicoară ◽  
Aurel Răduţă ◽  
Cosmin Locovei ◽  
Maria Cucuruz ◽  
...  

Experimental research in both medical sciences and material science rely in many situations on a reduced quantity of available data, due to limited number of patients or high costs of samples. Some statistical data manipulation methods are discussed regarding their applicability, information content, value and limits. A special attention is given to the extreme values eliminated by the GRUBBS test. The necessity of the elimination of the extreme values is demonstrated.


1986 ◽  
Vol 23 (04) ◽  
pp. 937-950 ◽  
Author(s):  
Jürg Hüsler

We extend some results of the extreme-value theory of stationary random sequences to non-stationary random sequences. The extremal index, defined in the stationary case, plays a similar role in the extended case. The details show that this index describes not only the behaviour of exceedances above a high level but also above a non-constant high boundary.


Author(s):  
Yang Yang ◽  
Yingchun Cui ◽  
Wenfa Yan

The fast and flexible characteristics of badminton determine the necessity of its lunge, and fast lunge will have an important impact on the results of the game in actual combat. In lunge evaluation, the contact time to the ground is a key indicator. This article selects two middle-aged male badminton amateurs with similar body shape and age, but different skill levels as the research objects to carry out comparative experiments. The microseismic equipment is used to record the floor vibration which is caused by the running of badminton amateurs in sports. The microseismic signals of lunge are processed and analyzed by MATLAB software. And we evaluate the pro and cons of various time to touch the ground from amateurs with different skill levels. The research found that 1. Microseismic technology can detect the contact time to the ground. 2. High-level badminton amateurs have obvious advantages in the footwork contact time. Microseismic technology has a certain feasibility as a tool for evaluating the footwork contact time of badminton.


2018 ◽  
Vol 4 (1) ◽  
pp. 39-43
Author(s):  
Mimi Suriatie

The purpose of this study is to obtain empirical data about improving social relations through group guidance services. The research plan used in this study was pre-experimental research using the pretest-posttest. The population in this study were students of class XI IPS, and the sampling technique used in this study was purposive sampling. The sample in this study were students who reflected a low level of social relations compared to other students, namely ten students � the method of power collection in this study using a questionnaire with a Likert scale. Before obtaining group guidance services, the level of social relations of students was in the low category with a percentage score of 486 with low criteria. Whereas after obtaining guidance services for social relations groups students receive an average rating of 812 with high standards. From the t-test obtained (t) count of 21.44 and the value (t) of the table at a significant level of 5% and N-1 (10-1) = 9 obtained (t) table of 2.262 thus, it can be concluded that group guidance services can improve student social relations. the conclusion is that there is a significant increase in students' social relationships after being given group guidance services


Buildings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 30
Author(s):  
Anatolijs Borodinecs ◽  
Aleksandrs Geikins ◽  
Elina Barone ◽  
Vladislavs Jacnevs ◽  
Aleksejs Prozuments

The growing terrorism threats across the world play an important role in the design of civil buildings and living areas. The safety of personnel is a top priority in unclassified buildings, especially military buildings. However indoor air quality and thermal comfort has a direct impact on personal productivity and ability to concentrate on duties and affect the decision making in stress conditions. The use of wooden structures is becoming more common in the building construction, and application of wooden frame structures for the construction of new buildings as well as for retrofitting the existing buildings. Prefabricated wooded frame construction perfectly fits need of unclassified buildings, allowing significant reduction of construction time and integration of various active and passive elements, such as a fresh air supply duct. Within the scope of this paper a 12 mm thick ballistic panel made of aramid was tested. Ballistic panel, thermal conductivity, and fire resistance of wooded construction panel with embedded air duct were analyzed for the various modelled exterior wall solutions. The main advantage of the proposed technology is fast and qualitative modular construction of unclassified buildings, providing all modern requirements not only for safety, but also for the energy efficiency and indoor air quality. It was found that bullet proof aramid panels do not reduce overall fire safety in comparison to traditional construction materials. However embedded outdoor air supply ducts significantly reduces construction heat transfer coefficient.


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