88 research outputs found

    Phase gate and readout with an atom/molecule hybrid platform

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    We suggest a combined atomic/molecular system for quantum computation, which takes advantage of highly developed techniques to control atoms and recent experimental progress in manipulation of ultracold molecules. We show that two atoms of different species in a given site, {\it e.g.}, in an optical lattice, could be used for qubit encoding, initialization and readout, with one atom carrying the qubit, the other enabling a gate. In particular, we describe how a two-qubit phase gate can be realized by transferring a pair of atoms into the ground rovibrational state of a polar molecule with a large dipole moment, and allowing two molecules to interact via their dipole-dipole interaction. We also discuss how the reverse process of coherently transferring a molecule into a pair of atoms could be used as a readout tool for molecular quantum computers

    Standardization of intravenous medication beyond use dating at a large health-system

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    Within a large, nine-hospital health-system, there are a number of hospitals that have historically reviewed the current literature individually to establish hospital-specific non-hazardous compounded sterile product (CSP) beyond-use date (BUD) lists. Creating and standardizing the list on a system level is a potential model that could reduce work at the individual site level, increase network patient safety, and facilitate the implementation of network technology. Researchers reviewed the most up-to-date literature and current non-hazardous CSP BUD lists at each site for inconsistencies to highlight the value and increased safety associated with standardizing this resource across the network

    NMR spectroscopy of hydrogen deuteride and magnetic moments of deuteron and triton

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    Magnetic moments of free and bound deuteron and triton are considered and new results for their magnetic moments (in units of that of the proton) and their g factors are presented. We report on a measurement with medium-pressure hydrogen deuteride (HD) at 10 atm, which is to be compared with the previous measurement done at 100 atm. We confirm that the high pressure used in former experiments caused no systematic effects at a level of 10 ppb. We also reexamined a theoretical uncertainty related to screening effects in HD and HT molecules and found that previously it was underestimated. The medium-pressure result obtained for the free deuteron mu_d/mu_p=0.307 012 206 5(28) with a fractional uncertainty of 9.1 * 10^-9 is free of systematic effects related to former high-pressure experiments. The reevaluated result for triton is mu_t/mu_p=1.066 639 908(10) with a fractional uncertainty of 9.3 * 10^-9.Comment: 3 figure

    Activation admixtures in concrete

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    Cílem této práce je shrnutí a pohled na příměsi do betonu. Jedná se o příměsi aktivní i inertní, které mají pozitivní vlastnosti na čerstvý i zatvrdlý beton. Především pak možné zvýšení jejich vazného potenciálu, pro co nejvyšší využití jejich pojivých vlastností, a to jak mechanickou tak chemickou cestou, popřípadě jejich kombinací, či jinou metodou. Dále pak posouzení fyzikálně – mechanických vlivů na čerstvý i zatvrdlý beton ve stáří až 60 dní, při částečné náhradě cementu příměsí odlišného charakteru.The aim of my bachelor´s work is the summarization and focus on admixure concrete,and the active and inert admixure, which have some positive characteristies for fresh and hardened concrete. Theoretically, I tried to study the increase of their joining potential while this characteristic can be used by either chemici or mechnical way, their combination as well. I also Works on evaluetion of physically mechanical influence for fresh and hardened concrete that can up to 60 days old while the cement was partly substituted by admixure of different character.

    Increase of Excavating Sponges on Caribbean Coral Reefs: Reproduction, Dispersal, and Coral Deterioration

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    Coral reefs ecosystems are deteriorating and facing dramatic changes. These changes suggest a shift in dominance from corals to other benthic organisms. Particularly in the Caribbean Sea, with corals dying, sponges have become the leading habitat-forming benthic animals. However, little is known about what life-history traits allow organisms to proliferate in a marine system that is undergoing change. Thus, the objective of this dissertation was to try to understand the current increase of encrusting excavating sponges on deteriorating Caribbean coral reefs through the study of reproduction, recruitment and dispersal potential of the widely distributed and currently expanding species, Cliona delitrix. Different methodological approaches were used, such as histology, electron microscopy, quantification of sponges in the field, genetics, and mathematical modeling. Results are presented in four different chapters. It was found that Cliona delitrix has an extended reproductive cycle in Florida, USA, from April - May to around November - December depending on a \u3e25°C sea-water temperature threshold. C. delitrix gametogenesis is asynchronous and it has multiple spawning events. C. delitrix is recruiting abundantly on Caribbean coral reefs, preferentially on recent coral mortality than on old coral mortality. The increase in C. delitrix and other excavating sponges can be explained by the repeated spawning and by the coincidence in time and space of larval production with the availability of new dead coral, which tend to overlap during the warmest months of the year. Eggs or larvae of C. delitrix appear to survive enough to be transported by currents over larger distances. It was found that dispersal ranges for Cliona delitrix may reach as far as ~315 km in the Florida reef track, and over ~971 km in the South Caribbean Sea, between Belize and Panama. Thus, reproduction, dispersal, and recruitment patterns of C. delitrix along with oceanographic currents, and eddies that form at different periods of time, are sustaining the spread of this sponge on coral reefs. According to mathematical models carried out, C. delitrix increase on reefs fluctuates depending of coral mortality events and available space on old dead coral (colonized by algae and other invertebrates). However, under temperature anomalies, these sponges will 2 tend to increase and take over the reef system only if heat stress and coral mortality is moderate. Under massive mortality events both corals and sponges will tend to decline, although sponges at a slower rate than corals. In general, coral excavating sponges have been favored by coral mortality, especially during past few decades. However as bioeroders, their success is also limited by the success of calcifying corals. In a reef management context and based on this dissertation’s findings, it is suggested that excavating sponges, and especially Cliona delitrix, should be more formally included in reef monitoring programs. Their increase can be used to track coral mortality events on reefs (past and future), and also can be used as another major bioindicator of health on coral reefs

    Analisis Kuat Tekan dan Laju Infiltrasi pada Beton Porous K-200 dengan Tambahan Sika Fume

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     Beton porous memiliki pori-pori yang lebih banyak dari beton normal yang menyebabkan kuat tekannya lebih rendah. Perlu dilakukan penelitian untuk dapat meningkatkan kuat tekan beton porous. Penelitian dilakukan dengan cara menambahkan zat aditif yaitu sika fume pada campuran beton porous dengan presentase 0%, 3%, 5% dan 7% dari berat semen. Dilakukan dua pengujian yaitu pengujian kuat tekan dan pengujian laju infiltrasi. Bentuk benda uji yang digunakan adalah silinder dengan ukuran 15cm x 30cm dan plat dengan ukuran 50cm x 50cm x 5cm. Pengujian kuat tekan dilakukan pada saat beton berumur 7, 14 dan 28 hari sedangkan pengujian laju infiltrasi dilakukan pada saat beton berumur 28 hari. Hasil penelitian menunjukan bahwa pemakaian 7% sika fume ke dalam campuran beton porous menghasilkan kuat tekan tertinggi dengan nilai kuat tekan sebesar 22,46 MPa. Sedangkan nilai maksimum dari pengujian laju infiltrasi ditunjukkan pada beton porous dengan pemakaian sika fume sebesar 3% dengan nilai laju infiltrasi sebesar 2550310,41 mm/jam. Dari hasil penelitian dapat diamati bahwa semakin banyak sika fume yang digunakan maka semakin tinggi nilai kuat tekan dan semakin kecil nilai laju infiltrasinya
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