This paper presents a model of an agile tail-sitter aircraft, which can operate as a helicopter as well as capable of transition to fixed-wing flight. Aerodynamics of the co-axial counter-rotating propellers with quad rotors are analysed under the condition that the co-axial is operated at equal rotor torque (power). A finite-time convergent observer based on Lyapunov function is presented to e...

This article describes the principles of sihr (sorcery) from an Islamic perspective, starting with discussion how to become a sorcerer and perform sorcery help satanic djinns amulets. Then, ruqya, practices for countering aid Qur’an Sunna, are exemplified in detail. Next, analyzes these can be interpreted by means ritual studies models identifies four components that essential successful cure. ...

Chemotherapy (chemo) is the specific systematic treatment administered in oncological practice for malignant neoplasms in order to destroy chaotically dividing abnormal cells. Chemo is a part of anticancer treatment along with radiotherapy, immunotherapy and surgery. The drugs used in chemotherapeutic protocols cannot be purchased over the counter; they can be taken with prescription only. Canc...

Background The purpose of this study was to determine the influence of linear and rotational pre-cure bracket displacement during the bonding procedure on shear bond strength (SBS) of orthodontic brackets. Material and Methods Stainless steel orthodontic premolar brackets were bonded to the buccal surfaces of 50 human pre-molars with a conventional two-step bonding protocol. Extracted human p...

The internal flow circulation dynamics of a liquid drop moving in a co- or counter-flowing gas stream has been numerically studied. The present work is concerned with the time accurate numerical solution of the two phase flow field at the low Mach number limit with an appropriate volume tracking method to capture motion and deformation of a liquid drop. It is shown that relative velocity betwee...

We study the problem of bisimilarity-checking between processes of one-counter automata and finite-state processes. We show that deciding weak bisimilarity between processes of one-counter nets (which are ‘restricted’ one-counter automata where the counter cannot be tested for zero) and finite-state processes is DP-hard. In particular, this means that the problem is both NP and co-NP hard. The ...

Convergence of geographic regions endemic for human immunodeficiency virus (HIV) and cutaneous leishmaniasis (CL) raise concerns that HIV co-infection may worsen CL burden, complicating already lengthy and costly CL treatments and highlighting a need for newer therapies. We constructed two Markov decision models to quantify impact of HIV on CL and help establish a target product profile for new...

BACKGROUND The metabolic syndrome is a group of risk factors predictive of cardiovascular diseases. The rising number of obese Americans has increased the prevalence of metabolic syndrome. This study investigated the hypothesis that the incidence of metabolic syndrome is decreased after laparoscopic gastric bypass surgery. METHODS The charts of all patients who had undergone laparoscopic gast...