No abstract

Purpose is substantiating ways to enhance durability and bearing capacity of open gears of ore-pulverizing drum mills as well as efficiency of engineering solutions concerning the increase in their unit power at the expense of drive improvement. Methods. Results of continual experiments and theoretical studies have been generalized as for the abrasion of working surfaces of open gear teeth of drum mills and factors influencing load distribution in terms of a tooth rim width. Findings. Comparative analysis between domestic mills and the best world-class products has been carried out. Ways of solving problems to design large-capacity mills with a gearbox drive have been demonstrated. Influence of hardness of working teeth surfaces on their durability has been evaluated quantitatively. The factors, governing load distribution in terms of tooth rim width, have been analyzed. Use of self-adjusting gear drives for open gears has been evaluated. Originality. Functional relation between stress-strain properties of working surface of teeth; the number of running-in modes, determined by operational conditions; and durability of open gear has been identified. The factors, influencing load distribution in terms of tooth rim width, have been considered. Practical implications. It has been shown that use of such open gears, where hardness of working surface of gear teeth is (500-600) H1B1 and that of a tooth rim one is (260-300) H2B2, makes it possible to provide almost wear-free operation. Moreover, it is the required condition for the performance of a tooth rim with two drive gears.

The article is devoted to the study of the definition and classification of sexism. Stressed that the word «sexism» became widely known during the women’s liberation movement of the 1960s. At that time, feminist theorists explained that the oppression of women was widespread in nearly all human society, and they began to speak of sexism instead of male chauvinism. Whereas male chauvinists were usually individual men who expressed the belief that they were superior to women, sexism referred to collective behavior that reflected society as a whole. Highlighted that today sexism means discrimination based on sex or gender, or the belief that because men are superior to women, discrimination is justified.The article emphasizes that sexism includes attitudes or ideology, including beliefs, theories, and ideas that hold one group (usually male) as deservedly superior to the other (usually female), and that justify oppressing members of the other group on the basis of their sex or gender. Besides, sexism involves practices and institutions and the ways in which oppression is carried out. Summarized that several different types of sexism exist, and each of them can have harmful consequences. The six main types of sexism include: benevolent sexism and hostile sexism (benevolent sexism usually stems from a desire to protect women due to a belief that women are inherently weaker, more sensitive, or more innocent than men. Whereas hostile sexism punishes women for violating traditional gender norms, benevolent sexism encourages those traditional roles); аmbivalent sexism (this type of sexism combines both hostile and benevolent forms. It fuses the seemingly contradictory beliefs that women are both fragile and pure as well as manipulative and conniving); іnterpersonal sexism (this type of sexism occurs in everyday interactions with partners); іnternalized sexism (self-adoption of sexism); institutional sexism (this type of sexism occurs when institutions like the media, healthcare, law enforcement, education, religion, and banking reinforce sexist ideology). Sexism can come from a wide range of sources: beliefs about traditional gender roles inherited from caregivers and educators; laws that promote different treatment of men and women; sexist imagery and language in pop culture and the media; lack of policies for responding to or penalizing sexism in the workplace, schools, and other sectors.

No abstract

No abstract