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Extraintestinal heterotopic gastric tissue simulating acute appendicitis

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World Journal of Gastroenterology 2008年第14期14卷 2268-2269页

作者： Elizabeth Bender Steven p schmidt Department of Surgery and Division of Surgical Research Summa Health System Akron Ohio 44304 United States

We describe the case of a 68-year-old otherwise healthy male who presented to our emergency room with signs and symptoms of acute appendicitis. Exploratory surgery revealed a normal appendix. Further examination revealed an enlarged lymph node-like mass of tissue near the appendix, in the ileocecal mesentery. This mass was removed and was found to be inflamed heterotopic gastric tissue. Although reports of heterotopic gastric tissue in the literature are common, we believe that this case represents the first report of inflamed heterotopic gastric tissue simulating appendicitis.

关键词： Heterotopic gastric mucosa Acute appendicitis

Modelling of particle layer detachment—Role of transient kinetic effects

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particuology 2009年第1期7卷 45-51页

作者： Eberhard schmidt Faculty D-Safety Engineering/Environmental protection University of WuppertalBuilding FFRainer-Gruenter-StrasseD-42119 WuppertalGermany

particle layers tend to build up on wails in many filtration and separation processes, calling for periodic removal in order to keep the apparatus running. Important factors are the adhesion of the layer on the substrate and the cohesion of the particles in the layer. Models describing such layer detachment generally assume constant and homogeneous conditions for the forces acting on the layer. But in reality detachment is extremely non-stationary concerning place and time, primarily due to changing conditions of the detaching forces on the one hand and changes in the particle layer morphology on the other. This paper describes a model and a simulation based on this model considering such transient kinetic effects, for which some computing results are presented and discussed.

关键词： Adhesive forces Filter cleanability Dust cake discharge patchy cleaning

Comparison between the quality and function of sperm after semen processing with two different methods

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Asian Journal of Andrology 2001年第2期3卷 125-130页

作者： M.E.Hammadeh p.M.Zavos p.Rosenbaum W.schmidt Dept. of Obs/Gyn University of Saarland 66421 Homburg/Saar GermanyAndrology Insitute of America and Kentucky Center for Reproductive Medicine & IVF Lexington KY USADept. of Obs/Gyn University of Saarland 66421 Homburg/Saar GermanyDept. of Obs/Gyn University of Saarland 66421 Homburg/Saar Germany

Aim: To compare the recovery rate of morphologically normal and chromatin condensed spermatozoa from native se-men samples using the Spermprep^(TM) filtration columns and percoll gradient centrifugation and to determine the influenceof the two processing techniques on fertilization and pregnancy rates in an IVF-ET program. Methods: Sixteen se-men samples obtained from patient's husband were included in this study. Each was divided into two aliquots. The firstaliquot was processed with Spermprep^(TM) filtration columns and the second, percoll gradient centrifugation. Smears weremade before and after semen processing with both methods for the evaluation of chromatin condensation (chromomycineCMA3) as well as morphology (strict criteria) of spermatozoa. One hundred and seventy oocytes were retrieved fromthe patients and the oocytes from each patient were subdivided into two sets : one set was inseminated using spermatozoaprocessed with Spermprep^(TM) and the other inseminated after semen processing with percoll gradient centrifugation. Re-sults: The percoll method yielded a significantly higher percentage of chromatin condensed (90.8 ±6.5% vs 82.3±8.8%, p = 0.017) and morphologically normal spermatozoa (12.9±7.4% vs 6.9±4.8%, p =0.001) in com-parison to Spermprep^(TM). Whereas, sperm count recovery rate was significantly higher after the use of Spermprep^(TM) thanafter the percoll gradient centrifugation. The fertilization rate was similar between the two methods. Conclusion:Semen processing with percoll should be recommended for intracytoplasmic sperm injection as the natural selection isbypassed and the Spermprep^(TM) technique could be recommended for IVF and IUI programs as the sperm concentrationplays a more significant role in these procedures.

关键词： sperm semen processing spermprep^(TM) percoll gradient centrifugation IVF

Quantification of particle separation using electrostatically charged spray mist in a dust chamber

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particuology 2021年第5期19卷 92-98页

作者： Marcel Zillgitt Eberhard schmidt Institute of particle Technology Rainer Gruenter StraBeBuilding FFCampusFreudenbergBergische Universitat Wuppertal42119 WuppertalGermany

In order to improve the efficiency of reducing fine dust emissions from diffuse sources,the commonly used water mist can be electrostatically ***,the attraction between particles and droplets increases due to electrostatic field *** the experimental investigations carried out,an electrostatic two-fluid nozzle was used to generate a charged spray mist according to the principle of charging by *** a chamber,dispersed dust was precipitated with the spray mist,while detecting the laser light *** means of comparative measurements it could be shown that faster sedimentation and separation takes place through electrostatic *** variations regarding the use of compressed air and water were investigated and the sedimentation time of the particle-droplet mixture in the chamber was shown.A size distribution was then calculated from the laser light attenuation,which shows that the proportion of small particles decreases with spray ***,the influence of the polarity of droplets and solid particles on the reduction measure was determined.

关键词： Dust separation Spray mist Electrostatic Dust chamber Laser light attenuation Charging by induction

Super-resolving microscopy images of Li-ion electrodes for fine-feature quantification using generative adversarial networks

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npj Computational Materials 2022年第1期8卷 650-660页

作者： Orkun Furat Donal p.Finegan Zhenzhen Yang Tom Kirstein Kandler Smith Volker schmidt Institute of Stochastics Ulm UniversityHelmholtzstraße 1889069UlmGermany National Renewable Energy Laboratory 15013 Denver W ParkwayGoldenCO80401USA Chemical Sciences and Engineering Division Argonne National Laboratory9700 S.Cass AvenueLemontIL60439USA

For a deeper understanding of the functional behavior of energy materials,it is necessary to investigate their microstructure,e.g.,via imaging techniques like scanning electron microscopy (SEM).However,active materials are often heterogeneous,necessitating quantification of features over large volumes to achieve representativity which often requires reduced resolution for large fields of *** within Li-ion electrode particles are an example of fine features,representative quantification of which requires large volumes of tens of *** overcome the trade-off between the imaged volume of the material and the resolution achieved,we deploy generative adversarial networks (GAN),namely SRGANs,to super-resolve SEM images of cracked cathode materials.A quantitative analysis indicates that SRGANs outperform various other networks for crack detection within aged cathode *** makes GANs viable for performing super-resolution on microscopy images for mitigating the trade-off between resolution and field of view,thus enabling representative quantification of fine features.

关键词： microstructure crack networks

Navigation sensors and systems in GNSS degraded and denied environments

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Chinese Journal of Aeronautics 2015年第1期28卷 1-10页

作者： George T.schmidt IEEE Aerospace and Electronic Systems Society

position, velocity, and timing（pVT） signals from the Global positioning System（GpS）are used throughout the world but the availability and reliability of these signals in all environments has become a subject of concern for both civilian and military applications. This presentation summarizes recent advances in navigation sensor technology, including GpS, inertial, and other navigation aids that address these concerns. Also addressed are developments in sensor integration technology with several examples described, including the Bluefin-21 system mechanization.

关键词： navigation inertial GNSS environments receiver degraded military addressed presentation advances

Machine learning guided high-throughput search of non-oxide garnets

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npj Computational Materials 2023年第1期9卷 1717-1725页

作者： Jonathan schmidt Hai-Chen Wang Georg schmidt Miguel A.L.Marques Institut für physik Martin-Luther-Universität Halle-WittenbergD-06099 HalleGermany

Garnets have found important applications in modern technologies including magnetorestriction,spintronics,lithium batteries,*** overwhelming majority of experimentally known garnets are oxides,while explorations(experimental or theoretical)for the rest of the chemical space have been limited in scope.A key issue is that the garnet structure has a large primitive unit cell,requiring a substantial amount of computational *** perform a comprehensive search of the complete chemical space for new garnets,we combine recent progress in graph neural networks with high-throughput *** apply the machine learning model to identify the potentially(meta-)stable garnet systems before performing systematic density-functional calculations to validate the *** discover more than 600 ternary garnets with distances to the convex hull below 100 meV⋅atom−*** includes sulfide,nitride,and halide *** analyze their electronic structure and discuss the connection between the value of the electronic band gap and charge balance.

关键词： structure sulfide oxides

Application of dynamic image analysis to the optical characterisation of fibrous bulk material

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particuology 2024年第7期90卷 51-60页

作者： Johannes Lunewski Eberhard schmidt Institute of particle Technology University of WuppertalGermany

Dynamic image analysis provides an automated evaluation method to determine the size and shape of multiple particles. This method represents a common application for ordinary bulk material. The latest draft of ISO 13322–2:2021 describes the state of the art, but lacks instructions for handling fibrous bulk material. Interlocking fibres complicate the measurement conditions and require a disentanglement of fibrous samples during a pre-dispersion step. A further error source includes the fibre orientation inside the measurement zone of the device. If the thresholding algorithm fails to differentiate between the fibre projection area and the background, a subsequent image optimisation solves the problem. This article addresses the mentioned problems by analysing cotton cellulose and polyacrylonitrile fibres. Besides the execution of a pre-dispersion step, the experiments compare the discrepancies between dry and wet dispersion. Here, the software packages pAQXOS and ImageJ perform the image evaluation. In this case, the wet dispersion setup with a subsequent image evaluation by ImageJ provides comprehensible results.

关键词： Bootstrap method Dynamic image analysis Fibre diameter Fibre length distribution Natural fibres Synthetic fibres

Entangled-photons generation with quantum dots

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Chinese physics B 2018年第2期27卷 140-153页

作者：李远丁飞 Oliver G schmidt Institute for Integrative Nanosciences IFW Dresden HelmholtzstraBe 20. 01069 Dresden. Germany Integrative for Solid State physics. Leibniz University of Hunnover. AppelstBe 2.30 167 Hannovel Germany

Entanglement between particles is a crucial resource in quantum information processing, an important example of which is the exploitation of entangled photons in quantum communication protocols. Among the different available sources of entangled photons, semiconductor quantum dots （QDs） excel owing to their deterministic emission properties, potential for electrical injections, and direct compatibility with semiconductor manufacturing techniques. Despite the great promises, QD-based sources at＇e far from being ideal. In particular, such sources present several critical issues, which require the overcoming of challenges pertaining to spectral tunability, entanglement fidelity, photon indistinguishability and brightness. In this article, we will discuss the potential solutions to these problems and review the recent progress in the field.

关键词： quantum information entangled-photon source quantum dots