Abstract This research aims to develop an algorithm for the precision vertical landing process on a quadcopter using GPS sensors and computer vision. consists of 2 main parts: GPS-based control used by return home area vision-based in form ArUco marker detection, which is order land precisely. Detection that goes through stages: application threshold ratio calculating black white area, can then...

The Gucheng region is oil and gas accumulation area of Tarim Basin，dominated by beach controlled lithologic reservoirs，which has superior conditions broad exploration prospects. lower Paleozoic strata in the are Carboniferous, Ordovician, Cambrian systems from top to bottom. Silurian, Devonian, Permian missing. Ordovician – main target layers area. There four reservoirs: group, Yingshan Penglai...

The purpose of this paper is the bibliometric analysis journals indexed in SciELO area teaching and learning English as a second language. searched were: How, Profile, Colombian Applied Linguistics Journal. search for information made it possible to compare different indicators. Although true that results research show scientific production field abundant, varied terms thematic lines, collabora...

Background Non-communicable diseases are the leading causes of global burden of diseases, and hypertension is one of the most important risk factors. Hypertension prevalence doubled in China in the past decade and affects more than 300 million Chinese people. In the review we systematically searched peer-reviewed publications that link health system level factors with hypertension management in...

BACKGROUND Potentially inappropriate prescribing (PIP) is commonly seen amongst the older population in all clinical settings, as indicated by several prevalence studies in several countries. Quantitative work such as this confirms that this is a global public health problem likely to grow in tandem with ageing of the global population. However, less attention has been focused on why it is happ...

BACKGROUND Reporting of relative risk reduction as the measure of treatment effect in randomized clinical trials (RCTs) may be difficult to understand. Here, we compare two methods for assessing absolute benefits of anticancer therapies. MATERIALS AND METHODS We searched PubMed for RCTs comparing therapies for breast and colorectal cancers published 1975-2009 (adjuvant setting) and 2000-2010 ...

BACKGROUND Stentless aortic bioprostheses have been advocated as being superior to conventional bioprosthetic valves, with benefits including superior left ventricular mass regression and larger effective orifice area. Several high-quality randomized studies now exist on this topic, and we sought to summarize them by meta-analysis. METHODS The literature was searched from 1995 to 2006, in MED...