Search results for "pump"
showing 10 items of 471 documents
Susanna Alakoski: Pumpulienkeli
2021
Kirja-arvostelu teoksesta Susanna Alakoski: Pumpulienkeli (Bomullsängeln) Suom. Sirkka-Liisa Sjöblom. Werner Söderström Osakeyhtiö 2021. 484 s. nonPeerReviewed
Iewehrojami latweeschi: skizes un atzerejumi [Ievērojami latvieši]
1887
Saturs: Priekšvārds -- Cimzes tēvs -- Krogzemju Mikus (Auseklis) -- J. Pilsātnieks -- Krišjānis Kalniņš -- Juris Alunāns -- Fr. Treulands (Fr. Brīvzemnieks) -- virsnieks Andrejs Pumpurs -- Brāļi Reinis un Matīss Kaudzīši -- Baumaņu Kārlis -- Marija Pēkšēna -- Jurjānu Andrejs.
Formations of finite monoids and formal languages: Eilenberg’s variety theorem revisited
2014
International audience; We present an extension of Eilenberg's variety theorem, a well-known result connecting algebra to formal languages. We prove that there is a bijective correspondence between formations of finite monoids and certain classes of languages, the formations of languages. Our result permits to treat classes of finite monoids which are not necessarily closed under taking submonoids, contrary to the original theory. We also prove a similar result for ordered monoids.; Nous présentons une extension du théorème des variétés d'Eilenberg, un résultat célèbre reliant l'algèbre à la théorie des langages formels. Nous montrons qu'il existe une correspondance bijective entre les form…
1.3 µm GaInNAs optically-pumped vertical cavity semiconductor optical amplifier
2003
A GaInNAs/GaAs vertical cavity semiconductor optical amplifier (VCSOA) is reported. This is believed to be the first monolithic VCSOA operating at 1.3 mum. Under continuous-wave optical pumping in a singlemode fibre coupled format, gain figures of up to 17.7 dB were achieved. Amplification with 12 GHz bandwidth,was obtained at 12.8 dB peak gain.
Influence of pump coherence on the dynamic behavior of a laser
1988
The dynamic behavior of a coherently pumped single-mode unidirectional ring laser with a homogeneously broadened three-level active medium is studied. Our formulation is based on a set often real equations of the plane-wave, mean-field Maxwell–Bloch type. The instability domain in the main control parameters space is determined. Our numerical study of these equations for a parameter range of the type explored in the recent experiments by Weiss Brock [ Phys. Rev. Lett.57, 2804 ( 1986)] reveals some similarities, but striking differences between our theoretical predictions and their experimental observations are also noted.
A Self-Contained Cylinder Drive with Indirectly Controlled Hydraulic Lock
2020
This paper presents a self-contained pump-controlled hydraulic linear drive including an innovative load holding sub-circuit. For safety critical applications such as crane manipulators, locking valves or load holding valves are enforced by legislation, but the load holding functionality may also be used actively to decrease the energy consumption for applications where the load is kept stationary for longer periods of time. The system proposed in this paper is based on a simple hydraulic architecture using two variablespeed electric motors each connected to a fixed-displacement pump. This architecture is well-known inacademic literature, but in this paper a novel load holding sub-circuit h…
An automatic system for stepwise treatment of solid samples and application to pollution evaluation by measuring ion lixiviation rates in lichens
1999
An automatic system for the stepwise treatment of solid samples is described. The system is controlled by a PC computer that is connected to a burette equipped with a three-way valve, to a peristaltic pump, and to a robot arm through two serial interfaces. In a cycle, the burette introduces a solvent volume in the sample cell, sonication is applied, and, after a fixed time, the pump carries the solvent to the vial selected by the robot arm. Measurements can be performed both in-line and off-line by analyzing the vial series. The program was written in Visual Basic 3. Lixiviation rates of several cations from the lichen Ramalina farinacea were measured by capillary zone electrophoresis using…
Phase-conjugate emission of a two-mirror solid state laser
2002
We show that phase conjugation strongly contributes to the emission of a solid state laser in a two-mirror (Fabry-Perot) resonator , enabling dynamic correction of thermal lensing . Full correction of thermal effects is reached by vector phase conjugation .
Is routine second-look endoscopy effective after endoscopic hemostasis in acute peptic ulcer bleeding? A meta-analysis
2012
Background Routine second-look endoscopy in modern-era peptic ulcer bleeding (PUB) remains controversial. Objective To assess the effectiveness of routine second-look endoscopy in patients with PUB exhibiting high-risk stigmata after standard medical care and endoscopic therapy. Design Comprehensive literature searches (1990-2011) were performed, seeking randomized trials comparing a routine with an as-needed second endoscopy. Main Outcome Measurements The main outcome was rebleeding. Secondary outcomes were surgery and mortality. Subanalyses assessed the influence of study quality, rebleeding definitions, endoscopic hemostasis modality, and proton pump inhibitor (PPI) therapies. Analyses w…
Electrical hybrid heat pumps assisted by natural gas boilers: a review
2022
In this paper, a comprehensive review is performed on hybrid systems using electrical Heat Pumps for Heating, Ventilation & Air Conditioning systems and Domestic Hot Water production using case studies from 2016 to 2022. This work particularly focuses on studies that investigated systems with electrical Heat Pumps assisted by a gas boiler. Some studies that considered the exploitation of renewable energy sources, but not as a whole sub-stitute for fossil sources, have also been included. In particular, the analysis investigated the layouts of the systems by considering the type and the size of the components, the control methods applied (by distinguishing rule-based control methods and …