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SPECIFIC ACTIVITY MEASUREMENTS TO DETERMINE PHOSPHORUS TURNOVER IN BLUEGILL, LEPOMIS-MACROCHIRUS

HYDROBIOLOGIA 1988年第1期157卷 3-11页

作者： KAHN, B TURGEON, KS MARTINI, DK DUNKERLY, SJ ELSHINAWY, RMK WILSON, MD 1.Nuclear Engineering and Health Physics Program School of Mechanical Engineering Georgia Institute of Technology 30332 Atlanta GA USA

The biological turnover constant for phosphorus was determined in muscle and five other sections of bluegill. Bluegill of average weight 121 g were maintained in a large flowthrough system at ***.-***. C and fed worms, Eisenia foetida, at two feeding levels, ad lib. (which averaged 2.6 g/d per 100-g fish, wet weight), and 1.5 g/d per 100-g fish. The daily phosphorus intakes at the two levels per 100-g fish were 3.1 and 1.8 mg. The average phosphorus concentration was 2.4 mg/g in muscle and 15.4 mg/g in the whole fish. Worm food was spiked with P-32 at increasing daily increments to balance radioactive decay. The radioactive worms were fed daily to the bluegill during the P-32 accumulation period of 51 days. For the next 28 days of depuration, nonradioactive worms were fed. Sets of three bluegill were collected at approximately weekly intervals, sectioned and analyzed for P-32 and phosphorus. All data were reported as specific activity in tissue relative to specific activity in feed, with P-32 count rates corrected for its 14.3-day half life. Phosphorus turnover constants were obtained by three approaches: (1) from the relative specific activity measured near steady state;(2) by fitting an equation for a 1-compartment model to the accumulation and depuration data;and (3) by fitting an equation for a simplified 2-compartment model to the depuration data. The biological turnover constant calculated with all three approaches was 0.004 d-1 for phosphorus in muscle of bluegill fed ad lib.

关键词： Phosphorus P-32 bluegill biological turnover constant radioactive tracer study specific activity measurements

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SEM ANALYSIS OF COPPER-CONTAINING INTRAUTERINE IMPLANTS

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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1981年第4期15卷 605-610页

作者： ROSENFELD, J WILLIAMS, WS SHARMA, NK Bioengineering Program University of Illinois at Urbana-Champaign Urbana Illinois 61801 Also with Department of Physics and Department of Ceramic Engineering.

The rate of dissolution of copper from the IUD implant, and hence the contribution of copper to the total contraceptive efficiency, will be influenced by any changes produced by the biological environment in the effective surface area and surface condition of the copper. Sixteen devices of the CU-7 IUD, some used for several months and others as-received, were examined optically and with the scanning electron microscope. A potential problem in the long-term performance (typically three years) of an IUD is the buildup of calcium deposits on the copper, as shown in the present study. The effective surface area presented to body fluids that will carry copper ions away can be reduced by a large factor through the formation of such deposits. Calcium-containing deposits on the copper in used IUD's, seen and identified here for the first time, could reduce the rate at which copper ion is introduced into the physiological system and thus undermine the biochemical aspect of the contraceptive action of the device. Such a degradation mechanism could help account for device failures, which occur at the rate of 1. 1 to 1. 5 per 100 users.

关键词： Clinical Research Contraception Contraception Failure Contraceptive Methods Contraceptive Methods--complications Copper Examinations And Diagnoses Family Planning Iud Material Iud, Copper Releasing Iud--complications Research Methodology Size

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Using an advanced mechanics of materials design project to enhance learning in an introductory mechanics of materials course

Using an advanced mechanics of materials design project to e...

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2002 ASEE Annual Conference and Exposition: Vive L'ingenieur

作者： Crone, Wendy C. Department of Engineering Physics Engineering Mechanics Program University of Wisconsin Madison

Design projects and experiments demonstrating mechanics concepts are two ways in which learning can be enhanced in undergraduate mechanics courses. This paper will discuss incorporation of these concepts in two mechanics of materials courses at the University of Wisconsin - Madison. Students in an Advanced Mechanics of Materials course were assigned a design project in which they created new table-top demonstrations and classroom experiments for the introductory level Mechanics of Materials course. The design project involved the development and construction of a table-top experiment or demonstration suitable for instruction in Mechanics of Materials. A written report, including instructions for use, descriptions of suggested demonstrations and experiments, and a thorough mechanics analysis of the device constructed, was required. In addition to providing the Advanced Mechanics of Materials students with a good open-ended design experience that reinforced introductory topics and helped the students to develop the advanced skills being studied in the course, some wonderful teaching demonstrations were created for the introductory Mechanics of Materials course. With a minimal supplies budget of $500, students created 9 projects, which addressed topics such as temperature effects, elastoplastic bending, and stress concentration. After the Advanced Mechanics of Materials course was completed, a guide was developed for instructors of the Mechanics of Materials course based on the students' project reports. In later semesters, the table-top demonstrations and classroom experiments served as a teaching aid in two introductory courses on mechanics of materials.

关键词： engineering education

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Computational design of serine hydrolases

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Science (New York, N.Y.) 2025年第6744期388卷 eadu2454页

作者： Lauko, Anna Pellock, Samuel J. Sumida, Kiera H. Anishchenko, Ivan Juergens, David Ahern, Woody Jeung, Jihun Shida, Alexander F. Hunt, Andrew Kalvet, Indrek Norn, Christoffer Humphreys, Ian R. Jamieson, Cooper Krishna, Rohith Kipnis, Yakov Kang, Alex Brackenbrough, Evans Bera, Asim K. Sankaran, Banumathi Houk, K.N. Baker, David Department of Biochemistry University of Washington Seattle WA United States Institute for Protein Design University of Washington Seattle WA United States Graduate Program in Biological Physics Structure and Design University of Washington Seattle WA United States Department of Chemistry University of Washington Seattle WA United States Graduate Program in Molecular Engineering University of Washington Seattle WA United States Paul G. Allen School of Computer Science and Engineering University of Washington Seattle WA United States Medical Scientist Training Program University of Washington Seattle WA United States Howard Hughes Medical Institute University of Washington Seattle WA United States Department of Chemistry and Biochemistry University of California Los Angeles CA United States

The design of enzymes with complex active sites that mediate multistep reactions remains an outstanding challenge. With serine hydrolases as a model system, we combined the generative capabilities of RFdiffusion with an ensemble generation method for assessing active site preorganization at each step in the reaction to design enzymes starting from minimal active site descriptions. Experimental characterization revealed catalytic efficiencies (kcat/Km) up to 2.2 × 105 M-1 s-1 and crystal structures that closely match the design models (Cα root mean square deviations <1 angstrom). Selection for structural compatibility across the reaction coordinate enabled identification of new catalysts remove with five different folds distinct from those of natural serine hydrolases. Our de novo approach provides insight into the geometric basis of catalysis and a roadmap for designing enzymes that catalyze multistep transformations.

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Polarimetric Study of GRS 1915+105: Estimation of Interstellar Polarization Component

arXiv

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arXiv 2025年

作者： Inokuchi, Jin Kawabata, Koji S. Uemura, Makoto Hiraga, Hiroyuki Hiroshima University High School Fukuyama 5-14-1 Kasuga-cho Fukuyama Hiroshima721-8551 Japan Hiroshima Astrophysical Science Center Hiroshima University 1-3-1 Kagamiyama Hiroshima Higashi-Hiroshima739-8526 Japan Physics Program Graduate School of Advanced Science and Engineering Hiroshima University 1-3-1 Kagamiyama Hiroshima Higashi-Hiroshima739-8526 Japan

GRS 1915+105 is a well-known X-ray binary system composed of a black hole with a low-mass companion star and is recognized for emitting relativistic jets. Imazato et al. (2021) performed extensive polarimetry in a near-infrared (NIR) Ks band from 2019 April through December when GRS 1915+105 experienced an X-ray low luminous state and found almost stable polarization of PP = 2.42% ± 0.08%. We performed NIR polarimetry of the field stars around GRS 1915+105 in 2023 April and October, and found that the field stars that are not listed in Gaia DR3 and StarHorse2 catalogues show well aligned polarization that is consistent with GRS 1915+105's polarization. Those suggest that the interstellar clouds existing beyond 4 kpc causes the large interstellar extinction and that the polarization the GRS 1915+105 is mostly originated from the magnetically aligned dust grains within the clouds. Therefore, the jet-origin synchrotron radiation polarization would have given only minor contribution in the NIR band in 2019 Apr-Dec. © 2025, CC BY.

关键词： Infrared devices

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Wall proximity effect on microparticles observed via dynamic laser speckle analysis 23

Wall proximity effect on microparticles observed via dynamic...

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Optical Biopsy XXIII: Toward Real-Time Spectroscopic Imaging and Diagnosis 2025

作者： Abbasian, Vahid Rad, Vahideh Farzam Darafsheh, Arash Cabrera, Humberto Department of Radiation Oncology Washington University School of Medicine in St. Louis St. LouisMO63110 United States Imaging Science Program McKelvey School of Engineering Washington University in St. Louis St. LouisMO63130 United States MLAB STI Unit The Abdus Salam International Centre for Theoretical Physics Strada Costiera 11 Trieste34151 Italy

ISBN: (纸本)9781510683709

We demonstrate the feasibility of using dynamic laser speckle analysis (DLSA) to investigate the influence of wall proximity on the sedimentation dynamics of colloidal particles in non-Newtonian fluids within a transparent flat-walled container. Polystyrene microspheres were imaged under laser illumination as they settled in oil within a quartz cuvette. By leveraging DLSA, we obtained comprehensive insights into the sedimentation process, highlighting substantial numerical and graphical variations in DLSA parameters at different distances from the cuvette wall. These findings reveal that particle sedimentation behavior is significantly affected by wall proximity. This innovative approach offers potential applications in medical diagnostics and research, providing a quantitative and non-invasive tool for analyzing blood flow, sedimentation, and related phenomena in various medical contexts. © 2025 SPIE.

关键词： Non Newtonian flow

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programming Variational Quantum Circuits with Quantum-Train Agent

Programming Variational Quantum Circuits with Quantum-Train ...

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Quantum Communications, Networking, and Computing (QCNC), International Conference on

作者： Chen-Yu Liu Samuel Yen-Chi Chen Kuan-Cheng Chen Wei-Jia Huang Yen-Jui Chang Graduate Institute of Applied Physics National Taiwan University Taipei Taiwan Hon Hai (Foxconn) Research Institute Taipei Taiwan Wells Fargo New York NY USA Department of Electrical and Electronic Engineering Imperial College London London UK Centre for Quantum Engineering Science and Technology (QuEST) Imperial College London London UK Quantum Information Center Chung Yuan Christian University Taoyuan City Taiwan Master Program in Intelligent Computing and Big Data Chung Yuan Christian University Taoyuan City Taiwan

ISBN: (数字)9798331531591

ISBN: (纸本)9798331531607

This study introduces the Quantum-Train Quantum Fast Weight programmer (QT-QFWP) framework, enabling efficient and scalable programming of variational quantum circuits (VQCs) through quantum-driven parameter updates for the classical slow programmer controlling the fast programmer VQC. By optimizing quantum and classical parameter management, QT-QFWP significantly reduces parameters (by 70–90%) compared to Quantum Long Short-Term Memory (QLSTM) and Quantum Fast Weight programmer (QFWP) while maintaining accuracy. Benchmarking on time-series tasks—including Damped Simple Harmonic Motion (SHM), NARMA5, and Simulated Gravitational Waves (GW)—demonstrates superior efficiency and predictive accuracy. QT-QFWP is particularly advantageous for near-term quantum systems, addressing qubit and gate fidelity constraints, enhancing VQC deployment in time-sensitive applications, and expanding quantum computing’s role in machine learning.

关键词： Quantum system Accuracy Computational modeling Qubit Neural networks programming Predictive models Quantum circuit physics Long short term memory

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Efficient pumping of atomic frequency combs in a Tm3+:YAG crystal for broadband quantum optical storage

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Physical Review Applied 2025年第5期23卷 054076-054076页

作者： Yisheng Lei Zongfeng Li Mahdi Hosseini Department of Electrical and Computer Engineering and Applied Physics Program Northwestern University Evanston Illinois 60208 USA Elmore Family School of Electrical and Computer Engineering Purdue University West Lafayette Indiana 47907 USA

Quantum memory devices with high storage efficiency and bandwidth are essential elements for future quantum networks. Here, we report a storage efficiency greater than 28% in a Tm3+:YAG crystal (where YAG is yttrium aluminum garnet) at elevated temperatures, achieving this milestone without relying on optical cavities and without compromising memory bandwidth. We introduce different pumping techniques for Tm-based memories that enable multifrequency-window storage and high memory bandwidth reaching 630 MHz, significantly surpassing previous Tm-based memory demonstrations, considering the operating temperature of 3.5 K. Furthermore, we propose a general method for large-bandwidth atomic frequency memory using non-Kramers rare-earth ions (REIs) in solids, paving the way for storage efficiencies and bandwidths approaching fundamental limits. The compatibility of Tm memories with neutral-atom quantum processors and their seamless integration with scalable photonic platforms, such as lithium niobate on insulator, underscore their potential for distributed quantum computing, hybrid quantum networks, and space-based quantum communication. Our study represents a significant advancement toward practical high-performance quantum memories based on REI-doped crystals, where we predict that gigahertz bandwidth and storage efficiencies exceeding 30% are achievable at lower temperatures.

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Passive design multi-objective optimization for high-performance tropical office buildings: Comparison of four different decision-making algorithms 18

Passive design multi-objective optimization for high-perform...

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18th IBPSA Conference on Building Simulation, BS 2023

作者： Rachman, Arinda Puspita Ichwania, Chalila Atthaillah Mangkuto, Rizki A. Pradipta, Justin Engineering Physics Doctorate Program Institut Teknologi Bandung Bandung Indonesia Engineering Physics Graduate Program Institut Teknologi Bandung Bandung Indonesia Department of Engineering Physics Institut Teknologi Bandung Bandung Indonesia

The implementation of passive design strategies is essential for improving building performance. However, selecting the best passive design solution can be challenging due to the multiple criteria involved. In this study, we compare four different Multi-Criteria Decision-Making (MCDM) methods: WSM, TOPSIS, VIKOR, and COPRAS, for selecting the best passive design solution. The criteria considered include energy use intensity (EUI), percentage of comfort hours (PCH), spatial daylight autonomy (sDA300/50%), and annual sunlight exposure (ASE1000,250). The results show that all MCDM methods provide the same best solution among the design alternatives generated by the optimizer if all criteria are equally important. We also found that WSM and VIKOR suggest similar top 10 alternative solutions, although there are differences in their respective ranking orders. However, if all design alternatives are considered, all evaluated methods suggest a unique ranking of solutions. The findings of this study can help designers and engineers select the most suitable MCDM method for their specific needs and achieve high-performance buildings. © 2023 *** rights reserved.

关键词： Office buildings

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The effect of calcium and barium fluoride on CeF3 doped in gadolinium phosphate scintillating glass

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Ceramics International 2025年

作者： Sarumaha, C.S. Kantuptim, P. Yanagida, T. Intachai, N. Kothan, S. Kim, H.J. Busayaporn, W. Pakawanit, P. Phoovasawat, C. Kaewnuam, E. Kaewkhao, J. Faculty of Science and Technology Muban Chombueng Rajabhat University Ratchaburi 70150 Thailand Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand Department of Materials Engineering Faculty of Engineering Kasetsart University Bangkok10900 Thailand Division of Materials Science of Science and Technology Nara Institute of Science and Technology 8916-5 Takayama Ikoma Nara630-0192 Japan Center of Radiation Research and Medical Imaging Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Chiang Mai50200 Thailand Department of Physics Kyungpook National University Daegu41566 Korea Republic of Synchrotron Research and Applications Division Synchrotron Light Research Institute 111 University Avenue Muang District Nakhon Ratchasima30000 Thailand Physics Program Faculty of Science and Technology Nakhon Pathom Rajabhat University Nakhon Pathom73000 Thailand

This study concerns alkaline fluorides such as CaF2 and BaF2 contained in gadolinium phosphate glass doped with CeF3, which were synthesized using a melt-quenching technique. Ce3+ was activated in both glasses and a comparative study of their optical, luminescence and scintillation behaviors was conducted. The results found that the higher atomic weight of BaF2 glass makes higher density compared with CaF2 glass, resulting in more integral scintillation efficiency. The quantum yield of BaF2-glass (PLZGdBafCe0.5) is also higher than that of CaF2-glass (PLZGdCafCe0.5). Energy transfer efficiency from Gd3+ to Ce3+ shows similar values, reflecting that the higher photoluminescence intensity of BaF2-glass comes from the efficiency of the luminescence center (Ce3+ ion). Photoluminescence and scintillation decay times were measured and found to be in the range of nanoseconds. XANES measurement was used to confirm the oxidation state and ratio between Ce3+/Ce4+. Moreover, the practical application of the glass scintillator was succeeded by micro-imaging using synchrotron X-ray. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Photoluminescence

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