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Preventing Pressure Oscillations Does Not Fix Local Linear Stability Issues of Entropy-Based Split-Form High-Order Schemes

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Communications on Applied Mathematics and Computation 2022年第3期4卷 880-903页

作者： Hendrik Ranocha gregor J.Gassner Applied Mathematics Münster University of Münster48149 MünsterGermany Computer Electrical and Mathematical Science and Engineering(CEMSE)Division King Abdullah University of Science and Technology(KAUST)Thuwal 23955-6900Saudi Arabia Department of Mathematics and Computer Science Center for Data and Simulation ScienceUniversity of CologneCologneGermany

Recently,it was discovered that the entropy-conserving/dissipative high-order split-form discontinuous Galerkin discretizations have robustness issues when trying to solve the sim-ple density wave propagation example for the compressible Euler *** issue is related to missing local linear stability,i.e.,the stability of the discretization towards per-turbations added to a stable base *** is strongly related to an anti-diffusion mech-anism,that is inherent in entropy-conserving two-point fluxes,which are a key ingredi-ent for the high-order discontinuous Galerkin *** this paper,we investigate if pressure equilibrium preservation is a remedy to these recently found local linear stability issues of entropy-conservative/dissipative high-order split-form discontinuous Galerkin methods for the compressible Euler *** equilibrium preservation describes the property of a discretization to keep pressure and velocity constant for pure density wave *** present the full theoretical derivation,analysis,and show corresponding numerical results to underline our *** addition,we characterize numerical fluxes for the Euler equations that are entropy-conservative,kinetic-energy-preserving,pressure-equilibrium-preserving,and have a density flux that does not depend on the *** source code to reproduce all numerical experiments presented in this article is available online(https://***/10.5281/zenodo.4054366).

关键词： Entropy conservation Kinetic energy preservation Pressure equilibrium preservation Compressible Euler equations Local linear stability Summation-by-parts

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Geothermal Research in Austria—An Overview on Recent Activities of the Geological Survey of Austria

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地学前缘 2009年第S1期16卷 153-154页

作者： Goetzl gregor Geological Survey of Austria

Increasing demand on environmentally friendly energy supply enforces the need for geothermal research in *** geothermal utilization for recreational purposes and local heating has long tradition in Austria,the first geothermal heating facility has been launched in 1978 at Bad Waltersdorf, and the currently installed capacities exceed 60 MWth,fundamental researches,for example in

关键词： geothermal energy surface heat flow density utilization potential research strategy

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Ultrafast Imaging of Electronic Relaxation in Ortho-xylene： New Features from Fragmentation-Ion Spectroscopy

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Chinese Physics Letters 2014年第12期31卷 130-133页

作者：刘玉柱 KNOPP gregor 肖韶荣 GERBER Thomas College of Physics and Opto-electronics Engineering Nanjing University of Information Science & Technology Nanjing 210044 Paul Scherrer Institute Villigen 5232 Switzerland

After light absorption, a molecule can undergo ra- diationless processes, and photophysics is one of the important general types. The photophysical pro- cesses involve internal conversion （IC） due to elec- tronic nonadiabaticity and intersystem crossing （ISC） induced by spin-orbit coupling. In polyatomic molecules that are excited IC and ISC to vibronic to higher electronic states, levels of lower electronic states are two dominant mechanisms. With the ad- vent of femtosecond ultrashort pulse, tracking and controlling the ultrafast photophysical processes be- come realizable. Due to the fact that ISC requires a change in the spin of an electron, it is usually a slower process than IC. However, extensive reports show that ultrafast competing ISC exists in a number of systems. Re- cently, Richter et al. reported femtosecond ISC in cytosine. Martinez-Fernandez et al. simulated the deactivation dynamics of photo-excited 6-thioguanine using a direct surface hopping dynamics approach Their simulations show that 6-thioguanine is another example of a system showing ultrafast ISC that can compete with IC in the same time scale. Both the spin-orbit and the dynamic couplings are important to describe realistically the excited state dynamics of 6-thioguanine. A similar phenomenon has also been evidenced in the S1 state of benzene. The exper- imental results show that the ultrafast decay of the S1 state is due to competing IC and ISC processes and both processes occur on a femtosecond timescale. Spin-orbit coupling is highly effective when the in- volved states are nearly isoenergetic.

关键词： ORTHOXYLENE ELECTRONIC excitation PHOTOELECTRONS IMAGING systems DAUGHTER ions FRAGMENTATION reactions SPECTRUM analysis

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Proper ties of core-EP order in rings with involution

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Frontiers of Mathematics in China 2019年第4期14卷 715-736页

作者： gregor DOLINAR Bojan KUZMA Janko MAROVT Burcu UNGOR University of Ljubljana Faculty of Elec trical Engineering Trzaska 25 SI-1000 Ljubljana Slovenia University of Primorska Glagoljaska 8 SI-6000 Koper Slovenia University of Maribor Faculty of Economics and Business Razlagova 14 SI-2000 Maribor Slovenia IMFM Jadranska 19 SI-1000 Ljubljana Slovenia Faculty of Sciences Ankara University 06100 Tandogan Ankara Turkey

We study properties of a relation in *-rings, called the core-EP (pre)order which was introduced by H. Wang on the set of all n × n complex matrices [Linear Algebra Appl., 2016, 508: 289-300] and has been recently generalized by Y. Gao, J. Chen, and Y. Ke to *-rings [Filomat, 2018, 32: 3073- 3085]. We present new characterizations of the core-EP order in *-rings with identity and introduce the notions of the dual core-EP decomposition and the dual core-EP order in *-rings.

关键词： Drazin inverse core-EP decomposition pre-order ring

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Origin of potential errors in the quantitative determination of terahertz optical properties in time-domain terahertz spectroscopy

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Chinese Optics Letters 2015年第9期13卷 82-86页

作者：梁启军 gregor Klatt Nico Krau? Oleksii Kukharenko Thomas Dekorsy Department of Physics and Center for Applied Photonics University of Konstanz Laser Quantum GmbH Faculty of Physics National Taras Shevchenko University of Kyiv

We demonstrate theoretically and experimentally how changes of a terahertz （THz） beam induced by the sample affect the accuracy of the determination of THz dielectric properties in THz time-domain transmission spectros- copy （TDTS）. We apply a Gaussian beam and the ABCD matrix formalism to describe the propagation of the THz beam in a focused beam setup. The insertion of the sample induces a focus displacement which is absent in the reference t without a sample. We show how the focus displacement can be corrected. The THz optical properties after focus displacement correction reported in this Letter are in quantitative agreement with those obtained using collimated beam THz-TDTSinpreviouswork.

关键词： THz Origin of potential errors in the quantitative determination of terahertz optical properties in time-domain terahertz spectroscopy time

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ESCRT machinery:role of membrane repair mechanisms in escaping cell death

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Signal Transduction and Targeted Therapy 2022年第8期7卷 2655-2657页

作者： Lisa gregor Sophia Stock Sebastian Kobold Division of Clinical Pharmacology Department of Medicine IVUniversity HospitalLudwig Maximilian University(LMU)of MunichLindwurmstrasse 2a80337 MunichGermany Department of MedicineⅢ University HospitalLudwig Maximilian University(LMU)of MunichMarchioninistrasse 1581377 MunichGermany German Cancer Consortium(DKTK) Partner Site MunichPettenkoferstrasse 8a80336 MunichGermany Einheit für Klinische Pharmakologie(EKLiP) Helmholtz Zentrum MünchenGerman Research Center for Environmental Health(HMGU)Ingolstädter Landstrasse 185764 NeuherbergGermany

A recent research article published in Science by Ritter et *** that endosomal sorting complexes required for transport(ESCRT)proteins mediate repair of lesions in the cell membrane caused by the pore-forming toxin perforin at sites of cytotoxic T cell engagement.1 Subsequent entry of granzymes and initiation of apoptosis of cancer cells is thus limited,leading to reduced sensitivity against T cell‑mediated cytotoxicity.1 Along these lines,this could constitute a new critical resistance mechanism for T cellbased treatment approaches.

关键词： al. cytotoxicity death

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Gas separation using porous cement membrane

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Journal of Environmental Sciences 2014年第1期26卷 140-146页

作者： Weiqi Zhang Maria Gaggl gregor J.G.Gluth Frank Behrendt Berlin Institute of Technology Department of Energy Engineering Chair EVUR Chinese Research Academy of Environmental Sciences Berlin Institute of Technology Chair of Building Materials BAM Federal Institute for Materials Research and Testing Division 7.4 Technology of Construction Materials

Gas separation is a key issue in various industrial fields. Hydrogen has the potential for application in clean fuel technologies. Therefore, the separation and purification of hydrogen is an important research subject. CO2 capture and storage have important roles in ＂green chemistry＂. As an effective clean technology, gas separation using inorganic membranes has attracted much attention in the last several decades. Membrane processes have many applications in the field of gas separation. Cement is one type of inorganic material, with the advantages of a lower cost and a longer lifespan. An experimental setup has been created and improved to measure twenty different cement membranes. The purpose of this work was to investigate the influence of gas molecule properties on the material transport and to explore the influence of operating conditions and membrane composition on separation efficiency. The influences of the above parameters are determined, the best conditions and membrane type are found, it is shown that cementitious material has the ability to separate gas mixtures, and the gas transport mechanism is studied.

关键词： gas separation porous membrane clean fuel cement membrane inorganic membranes

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Reinforcement learning building control approach harnessing imitation learning

Energy and AI

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Energy and AI 2023年第4期14卷 60-72页

作者： Sourav Dey Thibault Marzullo Xiangyu Zhang gregor Henze Department of Civil Environmental and Architectural EngineeringUniversity of ColoradoBoulderCOUSA National Renewable Energy Laboratory GoldenCOUSA Renewable and Sustainable Energy Institute BoulderCOUSA

Reinforcement learning(RL)has shown significant success in sequential decision making in fields like autonomous vehicles,robotics,marketing and gaming *** success has attracted the attention to the RL control approach for building energy systems which are becoming complicated due to the need to optimize for multiple,potentially conflicting,goals like occupant comfort,energy use and grid ***,for real world applications,RL has several drawbacks like requiring large training data and time,and unstable control behavior during the early exploration process making it infeasible for an application directly to building control *** address these issues,an imitation learning approach is utilized herein where the RL agents starts with a policy transferred from accepted rule based policies and heuristic *** approach is successful in reducing the training time,preventing the unstable early exploration behavior and improving upon an accepted rule-based policy-all of these make RL a more practical control approach for real world applications in the domain of building controls.

关键词： Reinforcement learning Building controls Imitation learning Artificial intelligence

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Catalytic domain of PDC-E2 contains epitopes recognized by antimitochondrial antibodies in primary biliary cirrhosis

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World Journal of Gastroenterology 2010年第8期16卷 973-981页

作者： Sandra Braun Christoph Berg Sandra Buck Michael gregor Reinhild Klein Department of Internal Medicine University of Tuebingen Department of Internal Medicine University of Tuebingen

AIM:To search for further immunodominant peptides of the pyruvate dehydrogenase complex E2-component (PDC-E2) recognized by antimitochondrial antibodies (AMA) in primary biliary cirrhosis (PBC). METHODS:Sera from 95 patients with PBC were tested by enzyme-linked immunosorbent assay against 33 synthetic overlapping peptides (25 amino acids; aa) covering the entire length of the E2-subunit of PDC-E2. Furthermore,the inner lipoyl peptide 167-184 was used in an unlip oylated and a lipoylated form as well as coupled to ovalbumin. Sera from 11 AMA negative/ANA posit ive PBC patients,63 patients with other liver disorders and 22 healthy blood donors served as ***:Of the 95 PBC-sera,74% reacted with the peptide 475-499 and 58% with the pept ide 407-431 located within the catalytic domain of PDC-E2. Patients with other disorders or healthy controls were positive in only up to 18%. Antibodies to the unlipoylatedand lip oylated pept ide 167-184 within the inner lipoyl domain were found in only 5% and 11% of the PBC sera,respectively; using ovalbumin-coupled peptides,the incidence increased up to 57% (unlipoylated form). CONCLUSION:Peptides within the catalytic site of PDC-E2 rather than the previously reported lipoyl binding peptide 167-184 may represent major immunodomin ant epitopes recognized by AMA in PBC.

关键词： Anti-M2 Epitope mapping E2-subunit Pyruvate dehydrogenase complex Inner lipoyl domain Active site Catalytic domain Primary biliary cirrhosis

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The Naked Truth-Perspectives on Internet Regulation and Pornography among Chinese Youth

The Naked Truth-Perspectives on Internet Regulation and Porn...

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作者： gregor Seuffert 复旦大学

学位级别：硕士

性交易在全世界的主流媒体中都是一个禁忌词汇。然而,随着互联网时代的来临,一般的市民都有机会通过大众传媒即时获得未经过滤的信息。由此带来的一个副产品就是浏览色情网站成为了可能。不同国家对这一问题有着不同的反应。在中国,政... 详细信息

性交易在全世界的主流媒体中都是一个禁忌词汇。然而,随着互联网时代的来临,一般的市民都有机会通过大众传媒即时获得未经过滤的信息。由此带来的一个副产品就是浏览色情网站成为了可能。不同国家对这一问题有着不同的反应。在中国,政府试图过滤掉色情等不恰当的内容。本文旨在研究中国政府对色情的限制如何影响大学生在网络上浏览色清内容的行为,此外考虑到移动互联网和社交媒体在中国式如此普遍,本文还研究了这样的限制能产生多大的效用。为阐明该问题,本文采用了社会调查的方法。有60名复旦大学的大学生参与了调查。调查结果表明中国大学生的网络使用行为与使用“自由互联网”国家的人不存在必然的差别。

关键词：色情互联网管理公众环境中国媒介互联网

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