Conception et construction d'une expérience d'atomes froids : vers un condensat de sodium sur puce

In this thesis, we describe the early stages in setting up a new experiment which aims at producing sodium Bose-Einstein condensates. The final apparatus will integrate an atomchip, enabling us to study the non-equilibrium dynamics of low-dimensional quantum gases, as well as their relaxation dynamics.The experimental setup comprises a laser system locked to an iodine rovibronic transition, and an ultra-high vacuum chamber. The latter consists of an oven producing an effusive atomic beam, which is decelerated in a Zeeman slower made with permanent magnets. We thus obtain a flux of 2 x 10^8 atoms/s, allowing the efficient loading of a magneto-optical trap containing up to 10^9 atoms.During the slower optimization, we observed a redistribution of the atomic populations from the |F = 2> state to the |F = 1> state before the entrance of the Zeeman slower. This depumping mechanism, induced by the interaction of the atoms with the slowing beam, has been confirmed by the numerical resolution of the optical Bloch equations describing the system. To circumvent this effect, we now prepare the atoms before the entrance of the slower in the |F = 2, mF = −2> magnetic substate with a two-frequency light beam.Finally, we designed a magnetic transport system to transfer the atoms from the magneto-optical trap chamber to the condensate chamber. Based on the results of molecular dynamics simulations, we found a performing temporal sequence to move the magnetic trap, and we intend to efficiently transport the atoms over 65 cm in about 1 s.Dans cette thèse, nous décrivons les premières étapes de la construction d’une expérience de condensation d’atomes de sodium. À terme, le dispositif intégrera une puce à atomes qui permettra d’étudier la dynamique hors équilibre de gaz quantiques de dimensionnalité réduite, ainsi que leur dynamique de relaxation.Le montage expérimental est constitué d’un système laser stabilisé en fréquence sur une raie de l’iode, ainsi que d’une enceinte à ultra-vide. Cette dernière comporte un four produisant un jet atomique effusif qui est décéléré dans un ralentisseur Zeeman à aimants permanents. Nous obtenons alors un flux de 2 x 10^8 atomes/s, ce qui nous permet de charger près de 10^9 atomes dans un piège magnéto-optique.Durant la caractérisation du ralentisseur Zeeman, nous avons mis en évidence un mécanisme de redistribution des populations atomiques vers l’état |F = 1> en amont du ralentisseur, induit par l’interaction avec le faisceau Zeeman. Après avoir confirmé ces observations par une résolution numérique des équations de Bloch optiques, nous avons mis en place un faisceau laser avec deux composantes de fréquence permettant de préparer initialement les atomes dans le sous-niveau |F = 2, mF = −2> pour les préserver de cet effet.Enfin, nous avons conçu un dispositif de transport magnétique permettant d’acheminer les atomes depuis l’enceinte du piège magnéto-optique vers l’enceinte du condensat. Des simulations de dynamique moléculaire nous ont permis de déterminer une séquence temporelle pour le déplacement du nuage performante, autorisant un transport de 65 cm en 1s

Fabrication of Digital Harmonic Vibration Practicum Using Phototransistor Sensor with Arduino-Uno Microcontroller

The problem in the harmonic vibration practicum is in calculating time accurately. Commonly, the time counter used was a stopwatch, but it was unable to provide valid data. As a result, the student has difficulty seeing the relationship between concepts with practical results in the laboratory. To overcome these problems, in this study, we developed a harmonic vibration practicum tool that is equipped with a digital timer using an Arduino Uno microcontroller as a light sensor. An Arduino can be programmed via a PC according to the wishes of the developer. This study was development research using a 4-D model (Define-design-develop-dissemination). The define and design stages respectively to find problems in the harmonic vibration practicum tool. The tool is finally designed and then calibrated, validated, and practical. The calibration results show that the percentage difference for repetition measurement and comparison that values with theory was 0.008% and 3.98%, respectively. In addition, the validation results show an average percentage of 87% or very valid. For practicality, the result through a limited test of Physics students of IAIN Batusangkar in the second semester shows a very practical response with a percentage of 85.96%. Due to time constraints, the dissemination stages have not been carried out in this study

SIMULASI ELEKTRIKAL KENDALI AUTOMATIC TRANSFER SWITCH BERBASIS PLC pada TRAINER SEBAGAI MEDIA PEMBELAJARAN MAHASISWA DIII TEKNIK ELEKTRONIKA POLITEKNIK HARAPAN BERSAMA

Teknologi sistem kontrol ATS (Automatic Transfer Switch) telah banyak digunakan pada sistem kelistrikan di industri, gedung – gedung, perkantoran, sekolahan/kampus dan bisa juga di rumah. ATS merupakan alat yang berguna sebagai pengalihan aliran daya listrik secara otomatis. PLC (Programmable Logic Control) merupakan suatu sistem peralatan yang digunakan untuk mengontrol suatu peralatan atau sistem lainnya dengan menggunakan suatu rangkaian logika yang dapat diprogram sesuai dengan kebutuhan. Penyediaan layanan suplai daya listrik dari PT. PLN (Persero) tidak selamanya kontinu, karena pada kondisi tertentu akan terjadi pemadaman yang disebabkan adanya gangguan atau pemeliharaan pada sistemnya. Untuk menjaga kontinuitas sumber daya listrik maka harus disediakan sumber cadangannya dengan dilengkapi alat ATS sebagai kontrolnya dan kontrol ini dapat dibangun dengan menggunakan PLC Omron tipe CP 1E–E20SDR–A. Tujuan penelitian untuk menerapkan ilmu/ keterampilan dari kampus melalui alat trainer ATS berbasis PLC sebagai alat ATS, dengan metode research and development (R&D) yang implementasinya membuat ATS – PLC. Hasil yang dicapai bahwa PLC supaya dapat bekerja butuh perangkat lunak berupa program ladder diagram yang merupakan salah satu bahasa pemograman PLC yang kinerjanya seperti cara kerja dari relai – relai dengan mengubah bentuknya menjadi operasi – operasi digital yang berupa OR, AND dan NOT

Implementasi Al-Kautsar Zakat Infaq & Sedekah (Alkazis) Untuk Meningkatkan Rasa Empati Siswa Di Smp Muhammadiyah Al-Kautsar Program Khusus (Pk) Kartasura

This research aims to describe the implementation of Al-Kautsar Zakat Infaq & Sedekah (ALKAZIS) to increase student empathy at SMP Muhammadiyah Al-Kautsar Special Program (PK) Kartasura. The basis for this research is that there are students who focus more on their computers when their friends need help, do not greet the teacher or school officials when they pass by, talk to themselves in class, and do not donate when the treasurer pulls them away. The approach used in this research uses a phenomenology approach This type of research is field research. In obtaining valid data that supports this research, the author used interviews, observation and documentation. This program is modeled after K.H Ahmad Dahlan in his preaching to the community regarding the letter Al-Ma'un, which encourages helping people who are experiencing difficulties. This program (ALKAZIS) has three process stages, namely: planning, implementation and evaluation. Based on data from the evaluation results that have been carried out, the researchers concluded that there was an increase in the sense of empathy experienced by students at Muhammadiyah Al-Kautsar Middle School, Kartasura Special Program, based on their achievement in meeting the empathy indicators mentioned by Farisa, including: understanding of other people, sensitivity to surroundings, and self-control in helping others. Then, with a sense of empathy within the students, it can encourage them to be more enthusiastic in worship and learning, as a form of gratitude for their current condition. As the vision of this school is used as a benchmark, namely to make an Islamic school with achievements and progress. Supporting factors in this program are the role of parents the role of teachers and. Meanwhile, the inhibiting factors are student motivation and erratic monthly reporting

Ruptured Sinus of Valsalva Aneurysm Causing Aorto–Atrial Fistula and Acute Heart Failure: A Rare Encounter

A ruptured sinus of Valsalva aneurysm as a cause of aorto–atrial fistula is very rare. We present the case of a 53-year-old female who presented with symptoms of acute heart failure and suspicion of an aorto–atrial fistula found on a transthoracic echocardiogram, which was confirmed on transesophageal echocardiography. A coronary angiogram showed normal coronary arteries but confirmed the right aorto–atrial fistula on aortogram. She underwent successful surgical repair of the fistula. Her postoperative echocardiogram showed a normal right atrium and right ventricle with no shunt. A ruptured sinus of Valsalva aneurysm is a devastating event and presents as acute heart failure. Prompt diagnosis and surgical repair is necessary to prevent mortality

Achieving treatment goals of reducing or maintaining body iron burden with deferasirox in patients with β-thalassaemia: results from the ESCALATOR study

This analysis evaluated the effects of deferasirox on liver iron concentration in moderate and heavily iron-overloaded patients with β-thalassaemia from the ESCALATOR trial (n = 231). Mean liver iron concentrations (LIC) decreased significantly from 21.1 ± 8.2 to 14.2 ± 12.1 mg Fe/g dry weight (dw) at 2 yr (P < 0.001) in patients with LIC ≥7 mg Fe/g dw at baseline; patients with LIC <7 mg Fe/g dw maintained these levels over the treatment period. The proportion of patients with LIC <7 mg Fe/g dw increased from 9.4% at core baseline to 39.3% by the end of year 2. The results showed that deferasirox enabled therapeutic goals to be achieved, by maintaining LIC in patients with LIC <7 mg Fe/g dw at a mean dose of 22.4 ± 5.2 mg/kg/d and significantly reducing LIC in patients with LIC ≥7 mg Fe/g dw at a mean dose of 25.7 ± 4.2 mg/kg/d, along with a manageable safety profile

Why honey is effective as a medicine. 1. Its use in modern medicine

Honey has been used as a medicine for thousands of years and its curative properties are well documented. However, modern medicine turned its back on honey and it is only now, with the advent of multi-resistant bacteria, that the antibiotic properties of honey are being rediscovered

Copernicus Ocean State Report, issue 6

The 6th issue of the Copernicus OSR incorporates a large range of topics for the blue, white and green ocean for all European regional seas, and the global ocean over 1993–2020 with a special focus on 2020

Body appreciation around the world: Measurement invariance of the Body Appreciation Scale-2 (BAS-2) across 65 nations, 40 languages, gender identities, and age.

The Body Appreciation Scale-2 (BAS-2) is a widely used measure of a core facet of the positive body image construct. However, extant research concerning measurement invariance of the BAS-2 across a large number of nations remains limited. Here, we utilised the Body Image in Nature (BINS) dataset - with data collected between 2020 and 2022 - to assess measurement invariance of the BAS-2 across 65 nations, 40 languages, gender identities, and age groups. Multi-group confirmatory factor analysis indicated that full scalar invariance was upheld across all nations, languages, gender identities, and age groups, suggesting that the unidimensional BAS-2 model has widespread applicability. There were large differences across nations and languages in latent body appreciation, while differences across gender identities and age groups were negligible-to-small. Additionally, greater body appreciation was significantly associated with higher life satisfaction, being single (versus being married or in a committed relationship), and greater rurality (versus urbanicity). Across a subset of nations where nation-level data were available, greater body appreciation was also significantly associated with greater cultural distance from the United States and greater relative income inequality. These findings suggest that the BAS-2 likely captures a near-universal conceptualisation of the body appreciation construct, which should facilitate further cross-cultural research. [Abstract copyright: Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.

Hyperoxemia and excess oxygen use in early acute respiratory distress syndrome : Insights from the LUNG SAFE study

Publisher Copyright: © 2020 The Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.Background: Concerns exist regarding the prevalence and impact of unnecessary oxygen use in patients with acute respiratory distress syndrome (ARDS). We examined this issue in patients with ARDS enrolled in the Large observational study to UNderstand the Global impact of Severe Acute respiratory FailurE (LUNG SAFE) study. Methods: In this secondary analysis of the LUNG SAFE study, we wished to determine the prevalence and the outcomes associated with hyperoxemia on day 1, sustained hyperoxemia, and excessive oxygen use in patients with early ARDS. Patients who fulfilled criteria of ARDS on day 1 and day 2 of acute hypoxemic respiratory failure were categorized based on the presence of hyperoxemia (PaO2 > 100 mmHg) on day 1, sustained (i.e., present on day 1 and day 2) hyperoxemia, or excessive oxygen use (FIO2 ≥ 0.60 during hyperoxemia). Results: Of 2005 patients that met the inclusion criteria, 131 (6.5%) were hypoxemic (PaO2 < 55 mmHg), 607 (30%) had hyperoxemia on day 1, and 250 (12%) had sustained hyperoxemia. Excess FIO2 use occurred in 400 (66%) out of 607 patients with hyperoxemia. Excess FIO2 use decreased from day 1 to day 2 of ARDS, with most hyperoxemic patients on day 2 receiving relatively low FIO2. Multivariate analyses found no independent relationship between day 1 hyperoxemia, sustained hyperoxemia, or excess FIO2 use and adverse clinical outcomes. Mortality was 42% in patients with excess FIO2 use, compared to 39% in a propensity-matched sample of normoxemic (PaO2 55-100 mmHg) patients (P = 0.47). Conclusions: Hyperoxemia and excess oxygen use are both prevalent in early ARDS but are most often non-sustained. No relationship was found between hyperoxemia or excessive oxygen use and patient outcome in this cohort. Trial registration: LUNG-SAFE is registered with ClinicalTrials.gov, NCT02010073publishersversionPeer reviewe