Roof bolting is the most popular type of support for underground mines’ workings. However, in Polish coal mines it used only as a supplementary support. To raise effectiveness and economic score horizontal development works, JSW (Jastrzębska Spółka Węglowa) started project to introduce independent rock its mines. The key element monitoring mine workings supported with roof bolting, appropriate ...

PROBLEM Incident investigation reports do not usually contain enough information to aid in studying boom arm vertical speed for roof bolting machines to determine the impact that appendage speed had on an operator's risk of experiencing a contact. Laboratory experiments with human subjects are also not feasible because of safety and ethical issues. METHOD Researchers successfully developed a ...

Greenhouse-grown oilseed rape (Brassica napus, annual Canola variety ;Westar') plants were harvested at six dates from the vegetative phase until the early pod (silique)-fill/late flowering stage. Endogenous gibberellin (GA)-like substances were extracted from stems, purified, and chromatographed on silica gel partition columns prior to bioassay in serial dilution using the ;Tan-ginbozu' dwarf ...

This paper describes an investigation into the use of advanced manufacturing techniques for creation a new class intermeshed steel connections that rely on neither welding nor bolting. The project detailed herein lays groundwork to transform building construction industry by advancing underlying science and engineering precepts created from precise, volumetric cutting. proposed system enhances ...

When carbon-fiber-reinforced plastic (CFRP) and steel are joined using blind riveting bolting, fastener inclination occurs due to the clearance between hole. To this end, study investigated unavoidable occurrence of when joining metal composite materials mechanical fastening. The effect on lap shear strength (LSS) was quantitatively under various conditions. In riveting, breakage occurred mainl...