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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

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

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

Decellularized extracellular matrix particle-based biomaterials for cartilage repair applications

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journal of Materials Science & Technology 2023年第29期160卷 194-203页

作者： Peng Guo Nan jiang Carina Mini gregor Miklosic Songsong Zhu Andrea j.Vernengo Matteo D’Este Sibylle Grad Mauro Alini Zhen Li AO Research Institute Davos Davos 7270Switzerland Department of Spine Surgery The Sixth Affiliated HospitalSun Yat-sen UniversityGuangzhou 510655China State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Disease and West China Hospital of Stomatology Sichuan UniversityChengdu 610041China Institute for Biomechanics ETH ZürichZürich 8093Switzerland

Cartilage Decellularized ExtraCellular Matrix(dECM)materials have shown promising cartilage regenera-tion capacity due to their chondrogenic ***,the limited retention of ECM components and the reduced integrity of functional ECM molecules during traditional decellularization processes im-pair the biomimicry of these *** current study aims to fabricate biomimetic materials con-taining decellularized cartilage particles that have an intact molecular structure and native composition as biomaterial inks and hydrogels for cartilage *** this,we established a novel two-fraction de-cellularization strategy for the preparation of reconstituted dECM(rdECM)particles by mixing the two-fraction components,as well as a one-fraction decellularization strategy for the preparation of biomimetic dECM(bdECM)*** acid-tyramine(THA)hydrogels containing rdECM or bdECM particles were produced and characterized via rheological test,swelling and stability evaluation,and compression *** results showed that our novel decellularization strategies preserved intact proteoglycans and collagen at a higher retention rate with adequate DNA removal compared to traditional methods of *** addition of rdECM or bdECM particles significantly increased the shear moduli of the THA bioinks while preserving their shear-thinning *** particle-embedded THA hydrogels also achieved long-term stability with a swelling ratio of 70%and high retention of glycosaminoglycans and collagen after long-term incubation,while rdECM particle-embedded THA hydrogels showed unsat-isfactory stability as self-standing *** to pure THA hydrogels,the addition of bdECM particles significantly enhanced the compression *** summary,our decellularization methods are successful in the retention of functional and intact cartilage components with high *** rdECM and bdECM particles can be supplemented in THA bioinks for biomimet

关键词： Cartilage tissue engineering Decellularized extracellular matrix Proteoglycan integrity Biomimetic hydrogels Biomaterial Bioink

Predictors of disease severity in ulcerative colitis patients from Southwestern Ontario

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World journal of Gastroenterology 2010年第2期16卷 232-236页

作者： Lee S Roth Nilesh Chande Terry Ponich Maya L Roth james gregor Division of Gastroenterology London Health Sciences Centre Victoria Hospital800 Commissioner’s Road EastLondon OntarioN6A 5W9Canada Operational Stress Injury Clinic Parkwood HospitalLondonOntarioN6C 5J1Canada

AIM:To understand the demographic characteristics of patients in Southwestern Ontario,Canada with ulcerative colitis(UC)in order to predict disease severity. METHODS:Records from 1996 to 2001 were exam- ined to create a database of UC patients seen in the London Health Sciences Centre South Street Hospital Inflammatory Bowel Disease *** be included, patients'charts were required to have information of their disease presentation and a minimum of 5 years of *** were reviewed using standardized data collection *** severity was generated during the chart review process,and non-endoscopic Mayo Score criteria were collected into a composite. RESULTS:One hundred and two consecutive patients'data were entered into the *** analyses revealed that 51%of the patients were male, the mean age at diagnosis was 39 years,13.7%had a first degree relative with inflammatory bowel disease (IBD),61.8%were nonsmokers and 24.5%were *** 22.5%of patients the disease was limited to the rectum,in 21.6%disease was limited to the sigmoid colon,in 22.5%disease was limited to the left colon,and 32.4%of patients had pancolitis. Standard multiple regression analysis which regressed a composite of physician global assessment of disease severity,average number of bowel movements,and average amount of blood in bowel movements on year of diagnosis and age at time of diagnosis was significant,R 2=0.306,F(7,74)=4.66,P<0.01. Delay from symptoms to diagnosis of UC,gender, family history of IBD,smoking status and disease severity at the time of diagnosis didnot significantly predict the composite measure. CONCLUSION:UC severity is associated with younger age at diagnosis and year of diagnosis in a longitudinal cohort of UC patients,and may identify prognostic UC indicators.

关键词： Demographic Disease severity Prognosis Ulcerative colitis

Current position of ALPPS in the surgical landscape of CRLM treatment proposals

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World journal of Gastroenterology 2013年第39期19卷 6548-6554页

作者： Marcello Donati gregor A Stavrou Karl j Oldhafer Department of General and Abdominal Surgery Asklepios Hospital Barmbek22291 HamburgGermany Department of Surgery General and Oncologic Surgery UnitVittorio-Emanuele University Hospital of Catania95122 CataniaItaly

The Authors summarize problems,criticisms but also advantages and indications regarding the recent surgical proposal of associating liver partition and portal vein ligation(PVL)for staged hepatectomy(ALPPS)for the surgical management of colorectal liver *** at published data,the technique,when compared with other traditional and well established methods such as PVL/portal vein embolisation(PVE),seems to give real advantages in terms of volumetric gain of future liver ***,major concerns are raised in the literature and some questions remain unanswered,preliminary experiences seem to be *** method has been adopted all over the world over the last 2 years,even if oncological long-term results remain unknown,and benefit for patients is *** prospective studies comparing traditional methods(PVE,PVL or classical 2 staged hepatectomy)with ALPPS are available to *** reinterpretations of the original method were also proposed in order to enhance feasability and increase safety of the *** data about morbidity and mortality are also *** real role of ALPPS is,to date,still to be *** clinical studies,even if,for ethical reasons,in well selected cohorts of patients,are expected to better define the indications for this new surgical strategy.

关键词： Portal ligation In situ split Liver resections Colorectal metastases Liver metastases

Theplant cytosolic m^(6)A RNA methylome stabilizes photosynthesis in the cold

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Plant Communications 2023年第6期4卷 70-84页

作者： Alexandre Magno Vicente Nikolay Manavski Paul Torben Rohn Lisa-Marie Schmid Antoni Garcia-Molina Dario Leister Charlotte Seydel Leo Bellin Torsten Möhlmann gregor Ammann Stefanie Kaiser jörg Meurer Plant Molecular Biology Faculty of BiologyLudwig-Maximilians-University MunichGroßhaderner Street 2-482152 Planegg-MartinsriedGermany Plant Development Faculty of BiologyLudwig-Maximilians-University MunichGroßhaderner Street 2-482152 Planegg-MartinsriedGermany Plant Physiology Faculty of BiologyUniversity of KaiserslauternErwin-Schröodinger-Street767663 KaiserslauternGermany Pharmaceutical Chemistry Goethe University FrankfurtMax-von-Laue-Str.960438 Frankfurt am MainGermany Present address:Loewe Biochemica GmbH Möuhlweg 2a82054 SauerlachGermany Present address:Center for Research in Agricultural Genomics 08193

The sessile lifestyle of plants requires an immediate response to environmental stressors that affect photosynthesis,growth,and crop ***,we showed that three abiotic perturbations—heat,cold,and high light—triggered considerable changes in the expression signatures of 42 epitranscriptomic factors(writers,erasers,and readers)with putative chloroplast-associated functions that formed clusters of commonly expressed genes in *** expression changes under all conditions were reversible upon deacclimation,identifying epitranscriptomic players as modulators in acclimation *** dysfunctions,particularly those induced by the oxidative stress-inducing norflurazon in a largely GENOME UNCOUPLED-independent manner,triggered retrograde signals to remodel chloroplastassociated epitranscriptomic expression patterns.N6-methyladenosine(m^(6)A)is known as the most prevalent RNA modification and impacts numerous developmental and physiological functions in living *** cold treatment,expression of components of the primary nuclear m^(6)A methyltransferase complex was upregulated,accompanied by a significant increase in cellular m^(6)A mRNA *** the cold,the presence of FIP37,a core component of the writer complex,played an important role in positive regulation of thylakoid structure,photosynthetic functions,and accumulation of photosystemⅠ,the Cytb6f complex,cyclic electron transport proteins,and Curvature Thylakoid1 but not that of photosystemⅡcomponents and the chloroplast ATP *** of FIP37 affected abundance,polysomal loading,and translation of cytosolic transcripts related to photosynthesis in the cold,suggesting m^(6)Adependent translational regulation of chloroplast *** summary,we identified multifaceted roles of the cellular m^(6)A RNA methylome in coping with cold;these were predominantly associated with chloroplasts and served to stabilize photosynthesis.

关键词： m^(6)A RNA methylation cold acclimation stress response Arabidopsis thaliana photosynthesis chloroplast

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Comparison of cauliflower-insect-fungus interactions and pesticides for cabbage root fly control

作者：格雷格·乔丹 gregor·jordan导演

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Insect Science 2017年第6期24卷 1057-1064页

作者： jaka Razinger Metka Zerjav Meta Zemljic-Urbancic Spela Modic Matthias Lutz Hans-josef Schroers jurg Grunder Simon Fellous gregor Urek Agricultural Institute of Slovenia Plant Protection Department Ljubljana Slovenia Agroscope Institut for Pflanzenbauwissenschaften Waedenswil Switzerland Zurich University of Applied Sciences School of Life Sciences and Facility Management Campus Grueental Waedenswil Switzerland INRA Center for the Biology and Management of Populations (CBGP) UMR Montpellier France

Cabbage root fly （Delia radicum L.） control represents a major challenge in brassica production, therefore different management strategies for its control were tested in conventionally managed open field cauliflower production. Strategies included treatments with low-risk methods such as nitrogen lime, the insecticide spinosad and the Beauveria bassiana ATCC 74040-based biopesticide Naturalis. Their effects were compared with treatments based on nonformulated fungal species Metarhizium brunneum, B. bassiana, Clonostachys solani, Trichoderma atroviride, T. koningiopsis, and T. gamsii and commercial insecticides λ-cyhalothrin and thiamethoxam. Spinosad and thiamethoxam were pipetted to individual plants before transplanting; λ-cyhalothrin was sprayed after transplanting; nitrogen lime was applied at first hoeing. Nonformulated fimgi were delivered onto cauliflower plantlets＇ roots as a single pretransplantation inoculation. The cabbage root fly population dynamics exhibited a strong spatiotemporal variation. The lowest number of cabbage root fly pupae recovered from cauliflower roots in the field experiments was recorded in plants treated with spinosad （significant reduction）, followed by Naturalis and one of the tested M. brunneurn strains （nonsignificant reduction）. Significantly more pupae were counted in the nitrogen lime treatment. The field experiments showed that a single drench of cauliflower plantlets with spinosad offered consistent and enduring cabbage root fly control. Naturalis and nonformulated fungal isolates did not decrease cabbage root fly pressure significantly, apparently due to lack of statistical power. The implications of the substantial intra- and inter-annual pest pressure variation and the benefits of using single plant treatments are discussed, and recommendations for improvement of rhizosphere-competence utilizing biological control strategies provided.

关键词： biological control cabbage maggot Delia radicum entomopathogenic fungi plant-insect-microbe interactions rhizosphere competence