Commissioning of the new AGS MMPS transformers

The Brookhaven AGS Main Magnet Power Supply (MMPS) is a thyristor control supply rated at 5500 Amps. +/-9000 Volts. The peak magnet power is 50 MWatts. The power supply is fed from a motor/generator manufactured by Siemens. During rectify and invert operation the P Bank power supplies are used. During the flattops the F Bank power supplies are used. The P Bank power supplies are fed from two 23 MVA transformers and the F Bank power supplies are fed from two 5.3 MYA transformers. The fundamental frequency of the F Bank power supplies is 1440 Hz, however the fundamental frequency of the P banks was 720 Hz. It was very important to reduce the ripple during rectify to improve polarized proton operations. For this reason and also because the original transformers were 45 years old we replaced these transformers with new ones and we made the fundamental frequency of both P and F banks 1440 Hz. This paper will highlight the major hurdles that were involved during the installation of the new transformers. It will present waveforms while running at different power levels up to 6MW full load. It will show the transition from the F-Bank power supplies to the P-Banks and also show the improvements in ripple made on the P-Bank power supplies

Interaktywne gry programu Vensim jako wsparcie procesu uczenia się w dynamice systemowej

This article presents the process of learning with the use of interactive gaming described on “Accidental Adversaries” archetype model, thus providing a new method of research than can be conducted on vast number of SD models. Authors selected an already well researched archetype to show a different approach in the process of model optimization. This gives the opportunity to share the knowledge about the possibilities of practical application of interactive gaming.W artykule opisano proces uczenia się z wykorzystaniem interaktywnych gier przedstawiony na archetypie „Przypadkowi przeciwnicy”, pokazując w ten sposób nową metodę badania, która może być zastosowana w ogromnej liczbie modeli dynamiki systemowej. Autorzy wybrali dokładnie zbadany i opisany w literaturze archetyp, aby zilustrować nowe podejście do procesu optymalizacji modelu. Przykład prezentuje nowe możliwości praktycznego zastosowania interaktywnych gier symulacyjnych

Homogeneous dielectric barrier discharge in CO 2

International audienceAbstract This study investigates dielectric barrier discharges generated in CO 2 at atmospheric pressure. According to the literature, under these conditions, discharges usually work in the filamentary regime. On the contrary, the experimental results reported in the present study demonstrate for the very first time that it is also possible to obtain a diffuse CO 2 discharge under these conditions. The diffuse regime appears to be related to a memory effect mechanism occurring at the dielectric surface. Both the filamentary and diffuse regimes were compared in this work based on electrical measurements coupled with intensified charged coupled device (iCCD) imaging and optical emission spectroscopy. The clear difference between both regimes is discussed

Influence of waves on the three-dimensional distribution of plastic in the ocean

The world's oceans are facing plastic pollution, 80 % of which of terrestrial origin flowing from the mismanaged waste of coastal populations and from river discharge. To study the fate of this pollution, the three-dimensional trajectories of neutral plastic particles continuously released for 24 years according to realistic source scenarios are computed using currents from a global ocean-wave coupled model at resolution and from a reference ocean-only model. These Lagrangian simulations show that neutral particles accumulate at the surface in the subtropical convergence zones from where they penetrate to about 250 m depth and strongly disperse over 40? of latitude. About 5.3 % of the particles remain at the surface with the wave-coupled model currents, whereas only 2 % for the uncoupled model, with some modulation in the location of the convergence zones. Increased surface retention results from upward vertical velocities induced by widespread divergence of waves-induced Stokes transport in the surface layers

High power fast ramping power supplies

Hundred megawatt level fast ramping power converters to drive proton and heavy ion machines are under research and development at accelerator facilities in the world. This is a leading edge technology. There are several topologies to achieve this power level. Their advantages and related issues will be discussed

Antibacterial activity of Sandoricum koetjape (Santol) leaf ethanolic extract against Staphylococcus aureus and Escherichia coli

Sandoricum koetjape, also known as santol, is a tropical fruit belonging to the Meliaceae family. This plant is used to cure diarrhea and fever, and to treat ringworm and armyworm. On the other hand, Staphylococcus aureus is a Gram-positive bacterium that lives in skin, hair, nose, throat and mucous membranes of warm-blooded animals. Its infections are common and may be acquired in hospital settings. Escherichia coli is a Gram-negative bacterium that can be found in the stomach and intestines of humans and warm-blooded animals. Other strains of E. coli can cause diarrhea, abdominal pain, cramping, nausea, and vomiting. In this study, S. koetjape was used to determine its antibacterial property against S. aureus and E. coli. Ethanolic extract of S. koetjape leaves was prepared into three treatment groups with concentration of 25%, 50% and 75% along with the control groups. The groups were subjected with the two bacteria (S. aureus and E. coli) to determine the antibacterial activity of the extract. Answering the statement of the problem number 1, the effect of the extract is the inhibition of growth of S. aureus and E. coli for a certain measure of the zone of inhibition. There is a significant difference between the zone of inhibition which suggests that the inhibitory effect of the various concentrations is different from one another. By comparing the average zone of inhibition for both S. aureus & E. coli, T3 is the most effective treatment among others. This study proved that the Sandoricum koetjape leaf ethanolic extract had an effect against Staphylococcus aureus and Escherichia coli

High Resolution Spintronics Probe-Array Technology Solutions for Very Near-Field Scanning

New integrated high-resolution Spintronics Probe-Array at nanometric and micronic scales are proposed for very-near field (VNF) scanning and OTA-testing of electronic circuits and radiating systems. The proposed technology solutions lead to small dimensions (micrometric range), reduced cost, and high magnetic field sensitivity at room temperature with tunability through smart-adaptive-biasing control. The measured performances exhibit improvements in terms of accuracy and thermal stability outperforming state of the art sensors based on SQUID techniques, Josephson junctions or loops-based technologies. Porting of chemically functionalized Spintronics into advanced FD-SOI platforms is proposed as an enabler of hybrid interferometric Thermal-Electromagnetic sensing based on unified analog-digital image-correlators using ASIC-System on a Chip (ASIC-SoC) integration solutions

Spintronics Technology Solutions for Interferometric Thermal-Electromagnetic Sensing

Hybrid electromagnetic (EM) and thermal imaging using spintronic technologies is proposed for sensing circuits and systems in near-field and far-field from DC (Switching-Power) to mmWave frequencies. High resolution spintronic sensors capable of detecting magnetic fields ranging from few tens of mT (milli-Tesla) down to tens of pT (pico-Tesla) are demonstrated spanning about 10 orders of magnitude in dynamic range. A configurable Agile Front-End-Module LNA (AFEM) is combined with spintronics probe-array sensors providing adjustable 80 dB of dynamic range for subsequent processing of MIMO correlations in time and frequency domains. The proposed hybrid EM-Thermal sensing solution is applied to mmWave beamforming modules demonstrating the possibility of extracting power-density and energy-density metrics as a function of beamforming angles. An infrared (IR)- Visual dual-camera is introduced together with augmented reality (AR) based on 3D non-uniform spatial-sampling. Porting of chemically functionalized spintronic sensing materials into advanced FD-SOI platforms is proposed using advanced MRAM/SRAM process technologies

Impact of COVID-19 on the performance of a radiation oncology department at a major comprehensive cancer centre in Poland during the first ten weeks of the epidemic

The outbreak of SARS-CoV-2 coronavirus rapidly altered radiotherapy service delivery around the world.AimThe main objective of this study was to assess the impact of precautionary measures implemented in response to the COVID-19 pandemic on the performance of a radiation oncology departments and on mitigation the risk of COVID-19 contagion between and among patients and staff.MethodsThe study period was from March 15 until May 22, 2020. We evaluated total number of patients irradiated and those who initiated treatments, taking into account tumours localisations. We assessed the relationship of potential risk of contagion with patients’ domiciles locations in regions with high number of COVID19 case.Results and conclusionsThe number of patients treated with radiotherapy during the study period decreased due to precautionary measures. After five weeks, the number of radiotherapy treatments began to increase. Just over half of the radiotherapy patients (53.5%) treated at the GPCC reside in the city of Poznan or in one of the ten surrounding counties where COVID19 incidence was low and reached at the end of the study period cumulative number of cases n = 204. The precautionary measures were effective qRT-PCR tests were performed in 1545 individuals (patients and hospital staff) revealing four staff members and none patient with a positive PCR result. Immunoglobulin testing was performed in 1132 individuals (patients and hospital staff). A total of 63 individuals were positive for antibodies