Search results for "offset"
showing 10 items of 63 documents
Wind gust estimation for precise quasi-hovering control of quadrotor aircraft
2021
Abstract This paper focuses on the control of quadrotor vehicles without wind sensors that are required to accurately track low-speed trajectories in the presence of moderate yet unknown wind gusts. By modeling the wind disturbance as exogenous inputs, and assuming that compensation of its effects can be achieved through quasi-static vehicle motions, this paper proposes an innovative estimation and control scheme comprising a linear dynamic filter for the estimation of such unknown inputs and requiring only position and attitude information. The filter is built upon results from Unknown Input Observer theory and allows estimation of wind and vehicle state without measurement of the wind its…
Adjustment time and offset of a system for spatially variable rate fertilisation
2005
The aim of this research is to measure the adjustment time and offset of a cheap system for spatially variable rate fertilisation, designed, developed and set up by the Mechanics Section of I.T.A.F. Department. In order to test the system, a centrifugal fertiliser spreader, working by gravity, was modified connecting an actuator with the two hopper shutter slides. Two different actuator types were tested, in order to measure the accordingly variable adjustment time and offset. The adjustment offset of the centrifugal spreader increases with increasing machine average forward speed and decreases with increasing fertiliser rate, considering the same rate variation. The main components of the …
Elaborating biodiversity offsetting towards ecological accounting of land use planning
2022
Suomen Akatemian hankerahoitus (TRANAPLAN, 333366) Ekologista kompensaatiota on ehdotettu keinoksi, jonka avulla myös Suomessa voitaisiin ratkoa maankäytön muutoksista aiheutuvan luontokadon ongelmaa. Esimerkiksi tonttituotantokohteiden tai rakennettavan liikenneväylän heikentämät luontoarvot tulisi hyvittää jossain toisaalla, jotta elinympäristöt ja luonnon monimuotoisuus eivät vähenisi hankkeen vaikutuksesta. Ekologisen kompensaation idea ei ole ongelmaton: sen voi perustellusti pelätä edistävän ympäristölle haitallisten hankkeiden toteuttamista. Kustannus, jonka maan käyttäjä luontoarvojen heikentämisestä saa vastattavakseen, voidaan mieltää ostetuksi luvaksi heikentää ympäristöä. Kompen…
Total ionizing dose (TID) evaluation of magnetic tunnel junction (MTJ) current sensors
2015
Abstract The paper shows an experimental study to know the behaviour of tunnel magnetoresistive effect-based current sensors configured in a Wheatstone bridge in response to irradiation. In particular the sensitivity, hysteresis, output offset voltage and input resistance are discussed when the sensors are submitted to a total irradiation dose of 43 krad with 36 krad/h dose rate. The same electrical parameters were studied subsequently once the irradiated sensors were submitted to an 80 °C annealing process. The studied TMR sensors are applied in a switched-mode power converter for space application.
Lower Crustal Rheology Controls the Development of Large Offset Strike‐Slip Faults During the Himalayan‐Tibetan Orogeny
2020
International audience
Offsetting harmful ecological impacts by restoring conservation areas
2019
Ihmistoiminnasta aiheutuvat ekologisesti haitalliset vaikutukset voidaan kompensoida tuottamalla luonnon kannalta hyötyjä, esimerkiksi ennallistamalla elinympäristöjä tai perustamalla uusia luonnonsuojelualueita. Elinympäristön ennallistaminen mahdollistaa elinympäristön palautumisen kohti luonnontilaa. Tämän tutkimuksen tarkoituksena oli selvittää, voitaisiinko jo aiemmin suojelluilla alueilla tehtävällä ennallistamisella saavuttaa ekologisessa kompensaatiossa tarvittava luontohyöty. Voi ehkä vaikuttaa siltä, että tällä tavoin tuotetut hyödyt eivät ole luonnon kannalta lisäisiä, koska toimenpiteet kohdistuvat alueisiin, jotka ovat jo suojeltu. Suomessa on kuitenkin tällä hetkellä monia suo…
Social impacts of biodiversity offsetting: A review
2022
Biodiversity offsetting is the widely studied last step of the mitigation hierarchy. Despite numerous studies and the methodological development completed for biodiversity calculations, the human aspect remains unsolved. Biodiversity conservation is typically governed at national or state levels, but the harm caused to biodiversity as well as people occurs locally. In biodiversity offsetting, biodiversity values can be relocated far from the original area, but relocating the values people hold regarding their nearby nature may not be possible. Acknowledging the local people's hopes and values may further complicate biodiversity offsetting, therefore it emphasises even more the need to avoid…
Novel constant current driver for ISFET/MEMFETs characterization
2001
Abstract In the present work a new constant current driver for ISFETs and MEMFETs sensors has been developed. The proposed circuit maintains the ISFET/MEMFET operation point at constant drain–source current and voltage. The combination of some programmable current sources and an appropriate selection of a simple precision resistor allow a good ISFET/MEMFET polarization. The use of operational amplifiers with low offset and drift are required to provide the buffering function needed by the sensor.
Comparación de los resultados radiológicos, clínicos y analíticos de un vástago con cuello modular y su homólogo monobloque en la artroplastia total …
2022
Introducción: La artroplastia total de cadera es uno de los grandes hitos de la ortopedia moderna. Los vástagos con cuellos modulares fueron introducidos con la ventaja teórica de permitir un ajuste más exacto de la anatomía. La hipótesis de nuestro trabajo es que el vástago modular H-MAX M con cuellos intercambiables permite restaurar el offset femoral y la longitud de miembros, de forma más ajustada que con el vástago monobloque homólogo H-MAX S, obteniendo con ello mejores resultados clínico-funcionales sin añadir los riesgos de una elevación sérica de cromo ni cobalto. El objetivo de nuestro trabajo es comparar los resultados radiológicos, clínicos y analíticos de un vástago con cuell…
Fifteen operationally important decisions in the planning of biodiversity offsets
2018
Many development projects, whether they are about construction of factories, mines, roads, railways, new suburbs, shopping malls, or even individual houses, have negative environmental consequences. Biodiversity offsetting is about compensating that damage, typically via habitat restoration, land management, or by establishment of new protected areas. Offsets are the fourth step of the so-called mitigation hierarchy, in which ecological damage is first avoided, minimized second, and third restored locally. Whatever residual damage remains is then offset. Offsetting has been increasingly adopted all around the world, but simultaneously serious concerns are expressed about the validity of the…