Search results for "COPT"

Offspring microbiomes differ across breeding sites in a panmictic species.

2019

High dispersal rates are known to homogenize host’s population genetic structure in panmictic species and to disrupt host local adaptation to the environment. Long-distance dispersal might also spread micro-organisms across large geographical areas. However, so far, to which extent selection mechanisms that shape host’s population genetics are mirrored in the population structure of the enteric microbiome remains unclear. High dispersal rates and horizontal parental transfer may homogenize bacterial communities between breeding sites (homogeneous hypothesis). Alternatively, strong selection from the local environment may differentiate bacterial communities between breeding sites (heterogene…

The helicopter for passenger transport on a regional scale.

2009

Study and Simulation of Helicopter Gearboxes Noise

2010

International audience; Main gearbox is one of the main noise sources in helicopter cabin. In order to improve the comfort of customers and reduce the health impact, acoustic and vibration mechanisms of gearboxes have to be understood and simulated during development phases. Thus, we first present the global methodology chosen to compute main gearboxes noise in helicopter cabins. Secondly, we described the way we compute mechanical excitation sources induced from gear mesh, static transmission error and meshing stiffness. Depending on the type of gear, we compute those using either analytical specially developed code or EC codes. Thirdly, we propose a modeling to compute dynamic loads on be…

Severe beak deformity in Melopsittacus undulatus caused by Knemidocoptes pilae

2014

An outbreak of knemidocoptic mange caused by Knemidocoptes pilae is described in caged Australian budgerigars (Melopsittacus undulatus) in a public park in L´Eliana (Valencia, Spain). Five individuals (5 out of 70) displayed severe malformation of the beak, with the rhamphotheca, rhinotheca, and gnathotheca affected and a slight lateral deviation of the jawbone, which did not, however, impede feeding or grooming.

I VOLI SANITARI

2018

The article concerns medical air transport, with particular reference to the rights of illness or injured passengers carried by air. Aspects concerning the european legal system on the medical emergency health service by aircraft and the requirements provisions of EMS and HEMS are examinated. Finally there is a part regarding the level of risk associated with health flight operations.

Trajectory robust control of autonomous quadcopters based on model decoupling and disturbance estimation

2021

In this article, a systematic procedure is given for determining a robust motion control law for autonomous quadcopters, starting from an input–output linearizable model. In particular, the suggested technique can be considered as a robust feedback linearization (FL), where the nonlinear state-feedback terms, which contain the aerodynamic forces and moments and other unknown disturbances, are estimated online by means of extended state observers. Therefore, the control system is made robust against unmodelled dynamics and endogenous as well as exogenous disturbances. The desired closed-loop dynamics is obtained by means of pole assignment. To have a feasible control action, that is, the fo…

A new species of Strunius(Sarcopterygii; Onychodontida) from Latvia; Lode quarry (Upper Devonian)

1995

Abstract A new species of the genus Strunius has been found. It is distinct from the other Strunius species; S. rolandi and S. walteri in the shape of the gular and parasymphysial teeth. The sigmoid tooth tips are harpoon-shaped and are similar to those of Onychodus jaekeli. Strunius nov. sp. is more closely related to S. rolandi than to the type-species S. walteri.

Topical anti-inflammatory activity of some Asian medicinal plants used in dermatological disorders.

2001

The topical anti-inflammatory activity of extracts from Cassia angustifolia, Rheum palmatum, Coptis chinensis, Phellodendron amurense and Scutellaria baicalensis, plants used in traditional East Asian medicine against different skin disorders, was studied. Though in different degree, all the extracts significantly inhibited the edema induced by 12-O-tetradecanoylphorbol-13-acetate (TPA), in both single or multiple application, oxazolone, and arachidonic acid (AA). None of the extracts inhibited in vitro the activity of phospholipase A(2) (PLA(2)) from Naja naja.

Seed isozyme variation in Petrocoptis A. Braun (Caryophyllaceae).

2001

Abstract The electrophoretic patterns of seven isozyme systems (ADH, AMY, AAT, GDH, LAP, MDH, and SOD) obtained from dormant seeds from 44 accessions belonging to 12 Petrocoptis taxa were compared in order to clarify taxonomic relationships within the genus. Overall, electrophoretic zymograms showed the presence of up 28 electromorphs, of which 26 were polymorphic among accessions. Mantel tests revealed a moderate level of correlation between the geographic distance matrix and several dissimilarity matrices based on the isozyme data ( r =0.3052–0.3376). The electrophoretic profiles of seed isozymes did not match closely the analytical taxonomic framework drawn from morphology. Many electrom…

Coptis chinensis Franch. exhibits neuroprotective properties against oxidative stress in human neuroblastoma cells.

2014

Abstract Ethnopharmacological relevance The dried rhizome of Coptis chinensis Franch. (family Ranunculaceae ) is traditionally used in Chinese medicine for the treatment of inflammatory diseases and diabetes. Recent studies showed a variety of activities of Coptis chinensis Franch. alkaloids, including neuroprotective, neuroregenerative, anti-diabetic, anti-oxidative and anti-inflammatory effects. However, there is no report on the neuroprotective effect of Coptis chinensis Franch. watery extract against tert -butylhydroperoxide ( t -BOOH) induced oxidative damage. The aim of the study is to investigate neuroprotective properties of Coptis chinensis Franch. rhizome watery extract (CRE) and …