Journal of undergraduate reports in physics最新文献_第2页

PhysiCL: An OpenCL-Accelerated Python Physics Simulator PhysiCL:OpenCL加速Python物理模拟器

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006351

Benjamin C. Warner

引用次数: 0

Probing the Energy Gaps of a Multi-Gap Superconductor: Ba(1-x)KxFe2As2 多隙超导体Ba(1-x)KxFe2As2的能隙探测

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006347

K. Ramanathan, Luke Conover, Oberon Wackwitz, R. Ramos

引用次数: 0

Demonstrating the Sagnac Effect Using Tabletop Optics on a Rotary Platform 在旋转平台上使用桌面光学演示Sagnac效应

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006346

J. Mock, Jared Medlin, M. Richards, E. Hamilton

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Preliminary Examination of Uncertainties due to Parton Distribution Functions in Far-Forward Neutrino Production at the Large Hadron Collider 大型强子对撞机远前中微子产生中部分子分布函数不确定性的初步研究

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006343

Fnu Karan Kumar

{"title":"Preliminary Examination of Uncertainties due to Parton Distribution Functions in Far-Forward Neutrino Production at the Large Hadron Collider","authors":"Fnu Karan Kumar","doi":"10.1063/10.0006343","DOIUrl":"https://doi.org/10.1063/10.0006343","url":null,"abstract":"Abstract. A large flux of neutrinos is expected in the forward direction of the pp collisions [1, 3] at the Large Hadron Collider (LHC) at CERN. Several experiments have recently been proposed at CERN to detect these neutrinos and discussion has started on the possibility of building a Forward Physics Facility grouping many of them. Among the others, the FASER-nu [2] proposal consists of a lead+emulsion neutrino detector at a distance of 480 m from the ATLAS interaction region along the tangent to the LHC beamline. Old calculations of neutrinos rates in the forward direction were done to leading order in the QCD perturbative series. We have included next-to-leading order (NLO) terms in our calculation. We have also studied the effect of incorporating a non-perturbative Gaussian intrinsic kT . This kT effect mimics the contribution from missing higher-order terms in QCD calculations. We present the study of uncertainties due to scale variations and Parton Distribution Function (PDF) variations in the production rate of D and tau neutrinos in the far-forward Production at the Large Hadron Collider. We compare our predictions with the LHCb data with D production in the rapidity range of [2 −4.5] at the LHC. In our studies, for which we consider various modern PDF sets, we also include the comparison of predictions obtained by different dynamical central scale assumptions.","PeriodicalId":93662,"journal":{"name":"Journal of undergraduate reports in physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42041312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Photometric Study of RR Lyrae Star TV Lyn 天琴座RR星TV Lyn光度学研究

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006345

She’Kayla Love, Hazra Susmita, M. Fitzgerald

引用次数: 0

Microgel Dynamics Characterization Using SEM 利用扫描电镜进行微凝胶动力学表征

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006350

S. Tietjen, Richard Sent, P. Fodor, K. Streletzky

{"title":"Microgel Dynamics Characterization Using SEM","authors":"S. Tietjen, Richard Sent, P. Fodor, K. Streletzky","doi":"10.1063/10.0006350","DOIUrl":"https://doi.org/10.1063/10.0006350","url":null,"abstract":"A methodology for imaging the dynamics of individual microgel particles using high resolution scanning electron microscopy (SEM) is presented. To enable this, the microgels are dispersed in an ionic liquid, which due to its low vapor pressure allows them to remain in suspension even under the high vacuum conditions present in a typical electron gun. Thus, compared with conventional electron microscopy studies of microgels, no sample drying or freezing is necessary which preserves their morphology while also allowing to probe microgel dynamics in solution. The results based on the individually tracked particles are compared with results from dynamic light scattering (DLS) which measures the mean size and diffusion properties of large collectives of particles. For the size measurements, the SEM and DLS data are in general agreement. For the particle dynamics, monitoring individual microgel motion reveals complex dynamics in which, aside from the expected thermal motion, one observes effects such as clustering, rotation and drift. This is in contrast with a control sample of hard sphere-like silica particles where the motion is primarily diffusional in good agreement with DLS studies.","PeriodicalId":93662,"journal":{"name":"Journal of undergraduate reports in physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46704312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Installation of a Cosmic-Ray Trigger System to Commission the Belle II Experiment VerteX Detector with Cosmic Rays 安装一个宇宙射线触发系统，以委托百丽二号实验顶点探测器与宇宙射线

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006341

Ahmed Halawani, R. Ayad, M. Albalawi, Mansour Alatawi, Abdulaziz Alatawi, Hans-Günter Moser

{"title":"Installation of a Cosmic-Ray Trigger System to Commission the Belle II Experiment VerteX Detector with Cosmic Rays","authors":"Ahmed Halawani, R. Ayad, M. Albalawi, Mansour Alatawi, Abdulaziz Alatawi, Hans-Günter Moser","doi":"10.1063/10.0006341","DOIUrl":"https://doi.org/10.1063/10.0006341","url":null,"abstract":"In this paper, we describe the design, construction, testing, and installation of the cosmic ray trigger system used to commission the VerteX Detector (VXD) of the Belle II experiment at the High-Energy Accelerator Research Organization (KEK) in Japan. The system consists of two rows of scintillators; with six scintillators being on top of the VXD, and six at the bottom of it. The scintillators were characterized (plateaus, threshold values, coincidences rate), and when compared with the simulation values a concordant match was found for all cosmic coincidence measurements. In Phase 3 of SuperKEKB accelerator, the VXD was the last sub-detector to be integrated into the heart of Belle II detector, after it was absent from being integrated within Belle II in Phase 1 and Phase 2 of SuperKEKB machine studies. A system consisting of VXD prototype parts had been installed, into Belle II detectors, at the VXD location during Phase 2 to study background and it was found that the VXD can cope with the level of measured background: allowing the VXD to be present during Phase 3 Belle II data taking. The VXD was tested with cosmic rays outside of Belle II before it was integrated within Belle II just before Phase 3 data taking, which commenced in March 2019.","PeriodicalId":93662,"journal":{"name":"Journal of undergraduate reports in physics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45155238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Test Particle Calculation of Plasma Equilibria 等离子体平衡的测试粒子计算

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006349

Jonathan Sullivan-Wood, D. Holland

引用次数: 0

Mapping the Photoresponse of the Quantum-Dot Based Photon-Number-Resolving Detector 基于量子点的光子数分辨探测器的光响应映射

Journal of undergraduate reports in physics Pub Date : 2021-01-01 DOI: 10.1063/10.0006339

Trevor Geerdts, Connor Govin, E. Gansen

{"title":"Mapping the Photoresponse of the Quantum-Dot Based Photon-Number-Resolving Detector","authors":"Trevor Geerdts, Connor Govin, E. Gansen","doi":"10.1063/10.0006339","DOIUrl":"https://doi.org/10.1063/10.0006339","url":null,"abstract":"Efficient and versatile photon-number resolving detectors are critical to the development of future communication systems. The quantum-dot, optically-gated, field-effect transistor (QDOGFET) is one such detector. Utilizing quantum dots (QDs), tiny islands of semiconductor, imbedded in a transistor, QDOGFETs have been shown to exhibit single-photon sensitivity and photon-number-resolving (PNR) capabilities. A photon is detected when it photocharges a QD, which alters the amount of current flowing through the transistor by screening the gate field. Crucial to the resolving power is that each charged QD produce the same response, regardless of its location within the active area of the device. Here, we investigate the extent spatial nonuniformities in the QDOGFET’s response to light limit its ability to distinguish different numbers of photons. By using an optical-scanning microscope (OSM), contour plots of a QDOGFET’s response are acquired that show that the device exhibits localized “hotspots” where it is particularly sensitive to photons. The spatial resolution of the microscope is enhanced by capping the QDOGFET with a solid-immersion lens (SIL). We present experimental results that show how the hotspots depend on bias conditions and help decipher the root cause of the nonuniformities.","PeriodicalId":93662,"journal":{"name":"Journal of undergraduate reports in physics","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59872125","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Viscoelastic Relaxation of the Nuclear Envelope Does Not Cause the Collapse of the Spindle After Ablation in S. pombe. 核包膜的粘弹性松弛不会引起S. pombe烧蚀后纺锤体的坍塌。

Journal of undergraduate reports in physics Pub Date : 2021-01-01 Epub Date: 2021-09-14 DOI: 10.1063/10.0006352

Parsa Zareiesfandabadi, Mary Williard Elting

{"title":"Viscoelastic Relaxation of the Nuclear Envelope Does Not Cause the Collapse of the Spindle After Ablation in S. pombe.","authors":"Parsa Zareiesfandabadi, Mary Williard Elting","doi":"10.1063/10.0006352","DOIUrl":"https://doi.org/10.1063/10.0006352","url":null,"abstract":"A large molecular machine called the mitotic spindle is responsible for accurate chromosome segregation in eukaryotic cells. The spindle consists of protein filaments known as microtubules and microtubule-associated proteins such as motors and crosslinkers, which help impart its organization. In the case of the fission yeast S. pombe, these form a single bundle inside the nucleus. During spindle elongation, sliding by motor proteins provides an internal source of extensile forces, which are resisted by the compressive forces of the nuclear envelope. To probe the sources of this force balance, we cut the spindle using focused laser light at various stages of spindle elongation. We find that the spindle pole bodies collapse toward each other post-ablation. While this basic behavior has been previously observed, many questions remain about the timing, mechanics, and molecular requirements of this phenomenon. Here, we quantify the time scale of the relaxation and probe its underlying mechanism. We demonstrate that viscoelastic relaxation of the nuclear envelope cannot explain this phenomenon and provide evidence of active forces as the underlying mechanism.","PeriodicalId":93662,"journal":{"name":"Journal of undergraduate reports in physics","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9472288/pdf/nihms-1823537.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"40362201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1