Studying gear power loss theoretically and determining the efficiency of a helical gear drive depend on many geometrical and working parameters, such as rotation speed, tooth number, gear ratio, helix angle, and torque, among others. In this paper, the Plackett–Burman screening design and the Box–Behnken response-surface method are used to consider how the above parameters influence gear drive efficiency, and experimental models are provided to evaluate these influences. The present results can be used to select the efficiency when calculating and designing gear transmissions and to choose the parameters for improving gear transmission efficiency.
The article presents the research results on medicinal plant resources at Tan Phu Protective Forests, Dong Nai Province. Initially, 351 plant species have been identified for medicinal use, belonging to 83 families, 3 plant divisions; in which: Pinophyta has 1 species belonging to 1 family; Polypodiophyta has 11 species belonging to 4 families; Magnoliophyta has 339 species belonging to 78 families. The life form is very diverse with the woody group having the highest number of species 152 species (accounting for 43.3%), the group of herbs having 73 species (20.8%), the group of shrubs, having 72 species (20.5%); The liana has 40 species (11.4%) and the epiphytes has the least with 14 species (4.0%), respectively. Medicinal plants are mainly used to treat groups of pimples, rashes, inflammation with 155 species (accounting for 44.16%); the group used to treat colds and fever with 112 species (accounting for 31.9%); group used to treat dysentery, diarrhea with 107 species (30.5%); group used to treat low and painful anesthesia with 105 species (29.9%); in the digestive system with 104 species (29.63%), respectively. The most commonly used treatment is pounding for topical use and excellent for internal use. Recorded 07 species in Group IIA in Decree 06/2019/ND-CP; 06 species in the Vietnam Red Data Book (2007): 03 species classified as Vulnerable - VU; 03 species classified as Endangered - EN. The medicinal resources here are being over-exploited, so it is necessary to have measures for conservation and development.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.