Search results for "hive"
showing 10 items of 300 documents
Search for scalar leptoquarks from Z$^0$ decays
1992
We have searched for pair produced scalar leptoquarks each decaying to a quark and a charged lepton in a sample of 116 000 hadronic Z0 events produced at LEP. No candidate was detected and cross section and branching ratio limits are set for the above process at 95% CL. Mass limits are found to be about 42 GeV/c2 depending only slightly on the models used and a coupling times branching ratio exclusion line is drawn for a scalar leptoquark with a free coupling. We have also probed the mass region above 45 GeV/c2 for a singly produced scalar leptoquark and set limits on the cross section and the coupling lambda(2)/4-pi up to 60 GeV.
BALDONE OBSERVATORY IN THE CIRCLES OF TIME
2019
1957 – The first laboratory building, known as the White House, was built near Baldone on the Riekstu hill, in the territory of the next Observatory. 01.01.1958 – The Astronomy Sector was separated from the Institute of Physics and commenced independent activi- ty as the Laboratory of Astrophysics at the Latvian Acade- my of Sciences (LAS). In 1967, with the decision of the Presidium of the Latvian SSR LAS the Laboratory of As- trophysics was transformed into the Radioastrophysic Ob- servatory at LAS. Under the leadership of the first director, Janis Ikaunieks, an instrumental observation base develops – a 1.2m Schmidt telescope was installed in 1966 for opti- cal observations. The project …
Vous avez dit bizarre ? Trésors insolites des Archives départementales des Vosges
2008
Catalogue d'exposition de documents insolites conservées aux Archives départementales des Vosges : reliques, objets, remploi de manuscrits médiévaux, etc.
Le réchauffement climatique diminue-t-il le risque de dégâts par le gel pour les cultures de climat tempéré ?
2014
Does global warming reduce the freezing injury risk to temperate climate crops? Winter crop response to a temperature increase is complex. Recent works point out, for cold climate vegetation, a paradoxical increase in freezing injury in a warming climate. Complementary works are needed to support these results for winter crops in temperate areas. To achieve this goal, five climatic records spanning a fifty years-long period for both daily minimum and maximum temperatures were analyzed with a model predicting frost hardiness and freezing damage for the winter pea crop. The methodological approach was based on three main steps: 1) the climate warming analysis of the 1987/1988 temperature shif…
Les passages à gué de la Grande Saône, approche archéologique et historique d'un espace fluvial (de Verdun-sur-le-Doubs à Lyon).
2002
National audience
Demethanization of aqueous anaerobic effluents using a polydimethylsiloxane membrane module: Mass transfer, fouling and feasibility
2017
Abstract The performance, fouling and feasibility of a polydimethylsiloxane hollow fibre membrane module for in situ methane degasification from the effluent of an Expanded Granular Sludge Bed anaerobic reactor has been investigated. Experiments at different operational conditions were carried out (liquid flow, sweep gas flow and vacuum pressure) with maximum removal efficiency (77%) at lowest flow-rate (0.4 L h−1), highest vacuum gauge pressure (−800 mbar) and liquid flowing in lumen side. Mass transport analysis denoted a considerably higher methane transfer than that predicted (attributed to liquid oversaturation). An enhancement factor for liquid phase has been proposed to correlate the…
Les images du Politique contestataire des Archives de la Planète : Témoignages filmés pour la postérité ou pour l’actualité ?
2019
International audience
Les archives ouvertes : état des lieux en 2017
2018
International audience; Les archives ouvertes s’inscrivent de plus en plus solidement et durablement dans le paysage documentaire de l’enseignement supérieur. Si les organismes de recherche ont été précurseurs pour la création d’archives ouvertes, les grandes écoles, mais surtout les universités ont désormais massivement rejoint le mouvement. Signe de cette progression notable, 82 % des répondants disposent en 2017 d’une archive en production ou en cours de mise en œuvre, contre 62 % en 2014. L’adoption majoritaire de la plate-forme HAL (qui représente 79 % des archives en production et 84 % des archives des universités parmi les répondants) se renforce encore depuis 2014. La structuration …
Establishing a Digital Repository
2018
A short, non technical guide for establishing a digital repository.
The determination of trace element concentrations in fly ash samples using ultrasound-assisted digestion followed with inductively coupled plasma opt…
2009
A method of ultrasound-assisted digestion followed by inductively coupled plasma optical emission spectrometry (ICP-OES) used for the determination of trace element (chromium, copper, lead, nickel, vanadium and zinc) concentrations in fly ash samples was developed. All the measurements were performed in robust plasma conditions. Ultrasound-assisted digestion procedures using digestion solutions of aqua regia and hydrofluoric acid (HF) resulted in recovery rates of over 80% for all the analyte elements. Ultrasound-assisted two-step digestion with digestion solutions of 6 mL of HNO₃(Step 1) and 3 mL of HNO₃+ 3 mL of HF (Step 2) resulted in recovery rates of over 92% for all the analyte elemen…