Search results for "pump"

Efficiency improvement of a ground coupled heat pump system from energy management

2011

The installed capacity of an air conditioning system is usually higher than the average cooling or heating demand along the year. So, most of the time, the system is working under its actual capacity. In this contribution, we study the way to improve the efficiency of a ground coupled heat pump air conditioning system by adapting its produced thermal energy to the actual thermal demand. For this purpose, an air conditioning system composed by a ground coupled heat pump and a central fan coil linked to an office located in a cooling dominated area was simulated, and a new management strategy aiming to diminish electrical consumption was developed under the basic constraint that comfort requi…

ECR2:n suihkulinjan ja HIISIn tyhjiöpumppujen suojaus HIISIn hajamagneettikentältä

2017

Tässä työssä suunniteltiin HIISIn tyhjiöpumpuille ja ECR2:n injektiolinjalle magneettiset suojaukset HIISIn kelojen synnyttämältä magneettikentältä. HIISIn aiheuttaman magneettikentän suuruutta ja suuntaa tutkittiin simulaatioiden ja mittausten avulla suojattavissa paikoissa. Tyhjiöpumppujen valmistajat ovat ilmoittaneet kunkin pumpun kestämät maksimimagneettivuot radiaalisesti sekä aksiaalisesti. Tyhjiöpumpuille suunniteltiin ferromagneettiset suojat, jotka pienentävät HIISIn hajakenttää tyhjiöpumppujen kohdalla riittävästi, jotta pumput eivät ole vaarassa vaurioitua HIISIä käytettäessä. Suojiksi valittiin toisesta päästä suljetut putket, jotka koostuvat matalahiilipitoisesta rakenneteräsl…

Nonlinear Hanle effect in Cs vapor under strong laser excitation

2002

We report results of a theoretical and experimental study of the ground state nonlinear Hanle effect under strong laser excitation. It is shown that besides the well-known zero-magnetic field suppression of absorption on F g = F→F e = F - 1 transitions caused by population trapping, an optical pumping induced enhanced absorption occurs on F g = F→F e = F + 1 transitions for small B-fields. The latter effect becomes more pronounced for high F values. The experiment with atomic vapor of Cs (D2 line, F g = 4) confirms an increase of the spectrally unresolved fluorescence yield at zero magnetic field and 600 mW/cm2 laser intensity by 9% or 42%, when excitation occurs with linearly or circularly…

Comparison of TID response and SEE characterization of single- and multi-level high density NAND flash memories

2009

Heavy ion single-event measurements and total ionizing dose (TID) response for 8Gb commercial NAND flash memories are reported. Radiation results of multilevel flash technology are compared with results from single-level flash technology. The single-level devices are less sensitive to single event upsets (SEUs) than multi-level devices. In general, these commercial high density memories exhibit less TID degradation compared to older generations of flash memories. The charge pump in this study survived up to 600 krads.

The Role of Technology in Participative Processes

2016

Smart city is more and more, in the common feeling, the crossroad of technologies, but first and foremost, the place where humans, contexts and technologies meet and must interact. Technological systems thanks to the deep human interaction acquire an uncertain behaviour that can be hardly modelled and controlled. The resulting complexity, cannot be easily handled with the tools that are available to separate scientific fields. The interdisciplinarity that comes from the implementation of technologies and the dialogue between these and the territories requires new tools for classification and design. New urban design tools are needed allowing to identify in a standardized way adequate suppor…

Novel Wireless Sensor System for Dynamic Characterization of Borehole Heat Exchangers

2011

The design and field test of a novel sensor system based in autonomous wireless sensors to measure the temperature of the heat transfer fluid along a borehole heat exchanger (BHE) is presented. The system, by means of two specials valves, inserts and extracts miniaturized wireless sensors inside the pipes of the borehole, which are carried by the thermal fluid. Each sensor is embedded in a small sphere of just 25 mm diameter and 8 gr weight, containing a transceiver, a microcontroller, a temperature sensor and a power supply. A wireless data processing unit transmits to the sensors the acquisition configuration before the measurements, and also downloads the temperature data measured by the…

Anti-helicobacter regimens

1996

Cellular and tissue expression of DAPIT, a phylogenetically conserved peptide

2011

DAPIT (Diabetes Associated Protein in Insulin-sensitive Tissues) is a small, phylogenetically conserved, 58 amino acid peptide that was previously shown to be down-regulated at mRNA level in insulin-sensitive tissues of type 1 diabetes rats. In this study we characterize a custom made antibody against DAPIT and confirm the mitochondrial presence of DAPIT on cellular level. We also show that DAPIT is localized in lysosomes of HUVEC and HEK 293T cells. In addition, we describe the histological expression of DAPIT in several tissues of rat and man and show that it is highly expressed especially in cells with high aerobic metabolism and epithelial cells related to active transport of nutrients …

Cavity Ring-Down Spectroscopy measurements of Acetone concentration

2017

This research has been partly supported by the National Research Programme "The next generation of information and communication technologies" (NexIT).

Fundamentals of metastability exchange optical pumping in helium

2010

21 pages; International audience; Advances in metastability exchange optical pumping (MEOP) at high laser powers, but also at high gas pressures and high magnetic field strengths, has provided strong motivation for revisiting the understanding of the limitations of this powerful technique. A comprehensive model has been developped for improved description of the combined effects of OP, ME, and relaxation, and of detailed MEOP features observed over the broad range of operating conditions. A brief description is provided, with illustrative comparisons of computed and experimental results. This improved tool is used to explain the excellent photon efficiency of OP obtained at all field streng…