scholarly journals Basic results of research of kinematics and dynamics little links of the mechanism of forest machines

2015 ◽  
Vol 5 (4) ◽  
pp. 208-214
Author(s):  
Платонова ◽  
Marina Platonova ◽  
Платонов ◽  
Aleksey Platonov ◽  
Драпалюк ◽  
...  

Currently, the traffic safety on the railways remains a topical problem of removing unwanted trees and shrubs in the right of way of railways. To improve the efficiency removal of unwanted shoots and branches and stumps, reducing the share of manual labor and facilitation of staff by the authors in 2015 were investigated little links resources saving compact means of mechanization, allowing their use in hard to reach places. These means of mechanization considered in combination with modern the vehicles, which can provide them with the necessary energy, both on the railroad track, and away from it. The design scheme drawn up manipulators for mathematical description of the motion of their units in the plan and profile of the railway, shows a diagram of the dynamic interaction between the rotary operating element with tree and shrub vegetation and stumps, and on the basis of these formulas and reasoned input parameter values it was built a number of plots. The article presents the main findings and recommendations of the study of kinematics and dynamics little links of the mechanism of forest machines. It was concluded that a number of promising kinematic schemes associated with the rotation of the body part telescopic of manipulators machines, substantiated possible working range of the of manipulators according to the scheme of their location on the machine base, a certain range of angles of rotation around the axis of the working equipment of its fastening, the issues of the impact of deviations small diameter unwanted shoots from the vertical cutting force.

2010 ◽  
Vol 16 (4) ◽  
pp. 112-121 ◽  
Author(s):  
Brennen W. Mills ◽  
Owen B. J. Carter ◽  
Robert J. Donovan

The objective of this case study was to experimentally manipulate the impact on arousal and recall of two characteristics frequently occurring in gruesome depictions of body parts in smoking cessation advertisements: the presence or absence of an external physical insult to the body part depicted; whether or not the image contains a clear figure/ground demarcation. Three hundred participants (46% male, 54% female; mean age 27.3 years, SD = 11.4) participated in a two-stage online study wherein they viewed and responded to a series of gruesome 4-s video images. Seventy-two video clips were created to provide a sample of images across the two conditions: physical insult versus no insult and clear figure/ground demarcation versus merged or no clear figure/ground demarcation. In stage one, participants viewed a randomly ordered series of 36 video clips and rated how “confronting” they considered each to be. Seven days later (stage two), to test recall of each video image, participants viewed all 72 clips and were asked to identify those they had seen previously. Images containing a physical insult were consistently rated more confronting and were remembered more accurately than images with no physical insult. Images with a clear figure/ground demarcation were rated as no more confronting but were consistently recalled with greater accuracy than those with unclear figure/ground demarcation. Makers of gruesome health warning television advertisements should incorporate some form of physical insult and use a clear figure/ground demarcation to maximize image recall and subsequent potential advertising effectiveness.


2013 ◽  
Vol 821-822 ◽  
pp. 735-745
Author(s):  
Alttabi Furat Jamal Hassan ◽  
Xiang Yang Bian ◽  
Xiao Yu Xin

There were signs of the first civilization known to humanity for more than 6000 years BC in the north of Iraq have disappeared this civilization to appear after 500 years in southern Iraq, the Sumerian civilization, which was considered as the opinion of scientists or civilizations, exceeds the impact to Asia and the countries that had been in contact (Sumerians) and see them today in other towns and villages. In subsequent periods of time appeared distinct personalities to their nature, religious, social, special clothing with clothes seem especially long. And usually dress is made from raw wool material making them in the Sumerian era. Put the garment on the body and leaves the top of the right shoulder with the survival of an open hand. There are of special clothing used by the clergy in the exercise of religious mourning rituals .There are traditional clothes to the clergy of other faiths. The clothing we see in the beginning of the third millennium BC has gained status in society in general, and was also the head cover. The animals have for centuries symbolized the signs of a divinity that we see hanging on the walls of some temples in northern Iraq. Centuries have been mentioned in the history of the Arabian were animal horns in Sumerian times to symbolize the moon in the Sumerian language .


2005 ◽  
Vol 13 (1) ◽  
pp. 19-30
Author(s):  
E. Huedo ◽  
A. Lepinette ◽  
R.S. Montero ◽  
I.M. Llorente ◽  
L. Vázquez

Impact cratering is an important geological process of special interest in Astrobiology. Its numerical simulation comprises the execution of a high number of tasks, since the search space of input parameter values includes the projectile diameter, the water depth and the impactor velocity. Furthermore, the execution time of each task is not uniform because of the different numerical properties of each experimental configuration. Grid technology is a promising platform to execute this kind of applications, since it provides the end user with a performance much higher than that achievable on any single organization. However, the scheduling of each task on a Grid involves challenging issues due to the unpredictable and heterogeneous behavior of both the Grid and the numerical code. This paper evaluates the performance of a Grid infrastructure based on the Globus toolkit and the GridWay framework, which provides the adaptive and fault tolerance functionality required to harness Grid resources, in the simulation of the impact cratering process. The experiments have been performed on a testbed composed of resources shared by five sites interconnected by RedIRIS, the Spanish Research and Education Network.


2020 ◽  
Vol 7 (3) ◽  
pp. 104-135
Author(s):  
L. Novoselova

In this article, an attempt is made to determine the legal status of the human body (organs and tissue) both while a person is alive and after a person dies. The article discusses the points of view of various authors in relation to the possibility of considering the human body, its organs and tissue, after their separation from the body, as objects of a person’s property rights, and also as an object of a person’s non-property rights. The article argues the impossibility of qualifying the human body and the organs that were not separated from it during life as parts – and perhaps critical parts – of the existence of the total human being, as objects of real (property) rights including the rights of the persons themselves. The human body as a single object is a personal non-property benefit. The organs and tissue separated from the body may be considered objects of real rights, but on several conditions: if they were indeed separated from the body and if the person gave permission for this in a will. The specific characteristics of the legal status of the separated organs and tissue of a human being are analyzed as things (possessions) with limited turnover. The specific characteristics of the legal status of the organs and tissue separated from the body as possessions in limited turnover are reviewed as well as the impact of personal non-property rights on this status. The main focus of the article is on the legal status of the human body and the organs separated from it after death in view of the fact that transplantology and postmortem organ donation are becoming more and more widespread. This issue is analyzed in terms of the body as a whole and as it applies to the organs and tissue that are not used for transplantation. The proposal is to base our analysis on the status of the human body after death which as a rule cannot be the object of property rights. The human body is disposed of within the framework of the protection of the personal non-property rights of the deceased, including the right of physical inviolability that covers the organs and tissue separated from the body. The article characterizes the legal nature of living wills when people give instructions as to the procedure of their burial and other means of handling their body, including donation of their bodies to science. The article examines the possibility of the right of ownership to organs and tissue separated from the body after death. This right can exist if a complex legal construct is present, including a direct or assumed living will of the person. The specific characteristics of living acts concerning the possibility of after-death organ and tissue harvesting for further use, including for transplantation purposes, and the differences between such acts and last wills are determined.


2021 ◽  
Vol 33 (1) ◽  
pp. 41-65
Author(s):  
Hanna Prószyńska-Bordas ◽  
Katarzyna Baranowska

The aim of the paper was to investigate health aspects of high altitude trekking such as preparation for the physical exertion during trekking at high altitude, the impact of mountaineering on the daily life before and after the expedition, the effect of high-mountain conditions on health and well-being. It was found that in the pre-departure period trekkers commonly train to ensure that they are physically fit for the expedition. They train alone or under the supervision of a trainer. Self-prepared workouts may turn out to be insufficient due to the lack of appropriate training plans. The most challenging aspects of high altitude trekking for the body include carrying too heavy equipment, dealing with illegibly marked routes, wearing inappropriate clothing, having an unbalanced diet, not having enough water, which can lead to dehydration and infections. Misconduct by other people poses a risk. The specific type of effort involved in mountaineering requires balanced nutrition in terms of both micro- and macro-elements. To find the right combination, one has to either experiment or seek advice from a dietitian. However, relatively few people consult a nutrition coach. Among sanitary problems, the most serious one is inappropriate human waste disposal, the resulting lack of drinkable water. Some of the observed problems result from insufficient regulations regarding the conduct in the mountains and from trekkers’ lack of awareness regarding good practices in such extreme conditions.


2021 ◽  
Vol 13 (11) ◽  
pp. 6368
Author(s):  
Xizhen Zhou ◽  
Binghong Pan ◽  
Yang Shao

The decision sight distance (DSD) at freeway exits is a major factor affecting traffic safety. Based on the Hechizhai Interchange in Xi’an City (Shaanxi Province, China), this paper designs a simulation experiment. Through a simulator study and a questionnaire survey, this paper discusses the impact of the DSD, 1.25 times the stopping sight distance (SSD) and a circular curve deflection on a driver’s driving state (including steering wheel angle rate and steering wheel angle frequency domain). Thirty volunteers participated in this research. The result shows that (1) it is safer to drive on an exit that meets DSD. (2) If it only meets the 1.25 times the SSD requirement, the overloaded driving tasks and operation would be more likely to cause crashes. The driving state of the driver on the right circular curve is obviously better than that on the left circular curve, because changing lanes to the right on the left circular curve does not meet the driver’s expectations. (3) Left and right circular curve should be treated differently in the driving area and the constant sight distance requirements should not be applied. (4) The left circular curve should be more stringent to ensure driving safety.


2019 ◽  
Author(s):  
Andi Dinda Fatimah Azzahra

Flat shoes are the second most popular women's footwear after high heels. Practical usage, direct use and fashionable shape, of course, causes many women to use it in activities as well as its use in the campus environment, many students are fond of wearing flat shoes. It turns out that flat shoes have the same risk as high hells. Shoes do not have the right to make the heel not well supported, this will make the feet work hard to hold the body and cause heel pain. The writing of this article aims to explain how the impact of using flat shoes in undergoing campus activities can cause heel pain in its users. The research method used in this study is descriptive qualitative by means of case studies on students of the Faculty of Medicine, Sebelas Maret University, Surakarta. The results of this study indicate that the use of flat shoes really shows the impact of heel pain on the use of flat shoes. Using shoes with a higher base does not resemble flat shoes and not as high as high hells in carrying out campus activities can protect comfort, safety and health.


2018 ◽  
Vol 40 (1) ◽  
pp. 11-20
Author(s):  
Tomasz Strzelecki ◽  
Anna Uciechowska-Grakowicz ◽  
Michał Strzelecki ◽  
Eugeniusz Sawicki ◽  
Łukasz Maniecki

Abstract This article presents the results of numerical simulations of seepage through the body of the dam and the reservoir bed. The purpose of this study was to analyse the seepage stability during a flood as well as the impact on seepage stability of the diaphragm wall and gravel columns, on which the dam body is founded in selected segments. Simulations were conducted for three different locations, and the following 3D models of the dum were prepared: – a model containing the front and right-bank part of the dam, for which no diaphragm wall, gravel columns and drainage ditch were provided for – a model of a segment of the right-bank dam including a diaphragm wall, drainage ditch and gravel columns under the dam (two variants with differing diaphragm wall lengths) – a model of the water dam segment accounting for gravel columns and a drainage ditch, but without a diaphragm wall. In the case of founding on gravel columns, the base was modelled as an anisotropic medium in terms of seepage properties, macroscopically equivalent to the actual soil medium. The numerical model utilises the finite element method. The geometry of the dam and geological substrate was defined in the GIS tools in the form of a 3D model of the terrain and geology of the substrate.


2019 ◽  
Vol 252 ◽  
pp. 09007
Author(s):  
Jerzy Montusiewicz ◽  
Stanisław Skulimowski

The problem of maintaining accuracy of autonomous movement of vehicles and robots is an important element of keeping the right level of traffic safety. This applies not only to autonomous cars, but also to construction or other industry mobile robots that will soon appear in the human environment. With that in mind, the authors present a multi-criteria assessment process, which can be used to assess the qualitative and quantitative movement of such robots, in order to better identify passage errors, as well as improve their way of moving. The authors wanted to check the effect of the set power level on engines, repeatability of subsequent runs, and the impact of the level of contamination of the surface on the stability of the robot movement. The article describes the results of the robots movement assessment based on (1) the surface areas of the routes envelope, (2) the augmented average route length and (3) the number of trajectory intersections. The results obtained were compared to the research scenarios – differences in set power for motors and the state of contamination of the surface


2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Meiyu Liu ◽  
Jing Shi

This is a subsequent study of a two-lane cellular automata (CA) traffic simulation model proposed by the authors. The current study focused on understanding the impacts of the configuration of the differentiated per-lane speed limit (DPLSL) and its compliance rate on traffic safety indexes, including lane-changing frequency, the coefficient of variation of speed, and incident rate of dangerous situations. The results indicate that freeway sections with DPLSL, especially the ones with complex DPLSL, have potentials to reduce the speed variation, lane changing frequencies, and chances of dangerous situations, resulting in higher traffic safety levels. Furthermore, under DPLSL configurations, the compliance rate of the lane of slow vehicles could positively affect the traffic safety levels. Specifically, as the decrease of the compliance rate, lane changing frequency slightly increases, the coefficient variation of speed especially of the outer lane increases, and the incident rate of the overtaking-on-the-right circumstances increases. In contrast to the simple DPLSL, freeway segments with the complex DPLSL configuration are more sensitive to the influence of the compliance rate.


Sign in / Sign up

Export Citation Format

Share Document