Study of Harmful Effects of Pesticides, Especially Seed Producers, on the Components of Agrocenosis

Media refers to the channels of communication through which we distribute news, education, movies, music, advertising messages and other information. It includes physical and online newspapers and magazines, television, radio, telephone, the Internet, fax and billboards, are a dominant force in lives of children. Although television is remaining the predominant medium for children and adolescents, the new technologies are become more popular. We have to concern about the potential harmful effects of media "messages and images"; however, the positive and negative effects of media should be recognized. Parents have to establish the plan for all media in family home. Media that are influences on children should be recognized by "schools, policymakers, product advertisers, and entertainment producers".

Download Full-text

A Comparison Of The Harmful Effects Of Secular Rock Music To The Christian Alternative

10.2986/tren.031-0082 ◽

1985 ◽

Author(s):

Robert A. Hills

Keyword(s):

Rock Music ◽

Harmful Effects

Download Full-text

About some aspects of sanitary and hygienic certification of carcinogenic enterprises

Russian Journal of Occupational Health and Industrial Ecology ◽

10.31089/1026-9428-2019-59-9-564-566 ◽

2020 ◽

pp. 564-565

Author(s):

I. I. Berezin ◽

G. A. Nikiforova

Keyword(s):

Working Conditions ◽

Full Information ◽

Harmful Effects

The actual problems of sanitary-hygienic certification of carcinogenic organizations are presented. The need to extend certification to all carcinogenic production, which will provide full information on the carcinogenic hazards of working conditions in order to eliminate the harmful effects of carcinogens.

Download Full-text

ANALYSIS OF STAND RESEARCH RESULTS OF AXIAL DYNAMIC FORCE IN DRILLING BY THREE ROLLER CONE BIT

PRECARPATHIAN BULLETIN OF THE SHEVCHENKO SCIENTIFIC SOCIETY Number ◽

10.31471/2304-7399-2019-1(53)-81-93 ◽

2019 ◽

pp. 81-93

Author(s):

В. М. Мойсишин ◽

M. V. Lyskanych ◽

R. A. Zhovniruk ◽

Ye. P. Majkovych

Keyword(s):

Low Frequency ◽

Maximum Energy ◽

Dynamic Force ◽

Low Frequency Oscillation ◽

Drilling Tool ◽

Rock Destruction ◽

Frequency Components ◽

Harmonic Components ◽

Experimental Values ◽

Harmful Effects

The purpose of the proposed article is to establish the causes of oscillations of drilling tool and the basic laws of the distribution of the total energy of the process of changing the axial dynamic force over frequencies of spectrum. Variable factors during experiments on the classical plan were the rigidity of drilling tool and the hardness of the rock. According to the results of research, the main power of the process of change of axial dynamic force during drilling of three roller cone bits is in the frequency range 0-32 Hz in which three harmonic frequency components are allocated which correspond to the theoretical values of low-frequency and gear oscillations of the chisel and proper oscillations of the bit. The experimental values of frequencies of harmonic components of energy and normalized spectrum as well as the magnitude of the dispersion of the axial dynamic force and its normalized values at these frequencies are presented. It has been found that with decreasing rigidity of the drilling tool maximum energy of axial dynamic force moves from the low-frequency oscillation region to the tooth oscillation area, intensifying the process of rock destruction and, at the same time, protecting the tool from the harmful effects of the vibrations of the bit. Reducing the rigidity of the drilling tool protects the bit from the harmful effects of the vibrations generated by the stand. The energy reductions in these fluctuations range from 47 to 77%.

Download Full-text