This study designed a vertical take-off and landing tailsitter unmanned aerial vehicle (UAV) with a long endurance time.Nine parameters of the tailsitter UAV were investigated.Using a 2k full factorial test, 512 experiments on the nine parameters were conducted at their maximum and minimum values.The time coefficient and air resistance were calcula
The use of leaf morphometrics in Salix was investigated at three genetic entry levels: species, family and clonal (progeny genotype).Data for seven leaf parameters, were collected from four full-sib Salix eriocephala and three S.exigua families.Principal componentanalysis, multivariate analysis of variance and discriminant analysis showed that most
This study aims to investigate clinical and pathological findings of a clinical Coenurus cerebralis case in a 10-month-old Simmental male calf.Clinical examination of the calf revealed incoordination, irregular gait, failure to hold GERANIUM the head straight, leftward head tilt, and circling.The animal was diagnosed with C.cerebralis and euthanazi
The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings.Here we present new data and methods for identifying key growth stages from bone histology.Previous breastplate studies on Psittacosaurus lujiatunen
The article presents the study results of the world trade stagnation issues associated with the WTO systemic crisis.The aim of the article is to summarize the main reasons for the world trade system disintegration and to identify feasible directions for the world economic order transformation.The G20 trade-restricting measures were analyzed based o