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2021年Abel奖获得者László Lovasz和Avi Wigderson访谈录(Ⅱ)

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数学译林 2022年第2期41卷 103-112页

作者： Bjorn Ian Dundas christian f.skau 陆柱家(译) 童欣(校) 不详

***算法Dundas&skau(以下简写为“D&S”):Lovasz(罗瓦兹)教授,我们想谈谈LLL算法,这是一种具有惊人应用的算法.例如,据称唯一可以抵御量子计算机攻击的加密货币体制使用LLL算法.该算法出现在您与Lenstra兄弟关于多项式因式分解的论文中... 详细信息

***算法Dundas&skau(以下简写为“D&S”):Lovasz(罗瓦兹)教授,我们想谈谈LLL算法,这是一种具有惊人应用的算法.例如,据称唯一可以抵御量子计算机攻击的加密货币体制使用LLL算法.该算法出现在您与Lenstra兄弟关于多项式因式分解的论文中,该算法或多或少遵循减少模素数的预期路径.

关键词：量子计算机 LLL算法多项式因式分解 (Ⅱ) 加密货币

Adsorption of pharmaceutical pollutants on ZnCl_(2)-activated biochar from corn cob:Efficiency,selectivity and mechanism

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Journal of Bioresources and Bioproducts 2024年第1期9卷 58-73页

作者： christian f.Varela L.C.Moreno-Aldana Yazmin Yaneth Agámez-Pertuz Department of Chemistry National University of ColombiaAv.Carrera 30 No.45-03BogotáD.C.Colombia Department of Biology and Chemistry University of the Llanoskm 12 road to Puerto LópezVillavicencioColombia

The occurrence of pharmaceuticals in water bodies and drinking water poses risks for the envi-ronment and human health,thus it is necessary to study methodologies that allow the efficient removal of these *** this work,corn cob-derived biochar was obtained by ZnCl_(2)-activation,and subsequent carbonization at 700℃.The effect of contact time,temperature,pH,and initial concentration on the adsorption capacity of acetaminophen(ACE)and amoxicillin(AMX)was determined through batch *** addition,the kinetics,isotherms,and ther-modynamics parameters were *** activated biochar exhibited a maximum adsorp-tion capacity of 332.08 mg/g for ACE and 175.86 mg/g for *** adsorption kinetics and adsorption isotherm of ACE corresponded to the pseudo-second order and Langmuir model,***,pseudo-first-order kinetics and the freundlich isotherm model were well-fitted to AMX *** ACE and AMX co-adsorption had a synergistic effect on AMX but an antagonistic effect on ACE removal,achieving a maximum adsorption capacity of 193.51 and 184.58 mg/g,*** the other hand,fixed-bed column experiments showed that the adsorption capacity depends on the influent concentration,and the breakthrough curve fits the Thomas and Yoon-Nelson *** mechanism adsorption studies showed that surface inter-actions(hydrogen bonding formation and n-𝜋interactions)are the main driving forces for the adsorption process,and pore filling is the rate-limiting *** this way,the prepared biochar exhibits a high potential for the adsorption of pharmaceutical compounds from water.

关键词： Biochar Adsorption Acetaminophen Amoxicillin Wastewater treatment

2022年Abel奖获得者Dennis Sullivan访谈录

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数学译林 2022年第4期41卷 349-362页

作者： Bjorn Ian Dundas christian f.skau 陆柱家(译) 童欣(校) 不详

Dundas&skau(以下简写为“D&S”):Sullivan(沙利文)教授,首先,我们要祝贺您由于您在最广泛意义上的拓扑学,特别是在代数学、几何学和动力学方面的突破性贡献被授予2022年Abel(阿贝尔)奖.明天您将从挪威国王陛下手中接过Abel奖.Sullivan... 详细信息

Dundas&skau(以下简写为“D&S”):Sullivan(沙利文)教授,首先,我们要祝贺您由于您在最广泛意义上的拓扑学,特别是在代数学、几何学和动力学方面的突破性贡献被授予2022年Abel(阿贝尔)奖.明天您将从挪威国王陛下手中接过Abel奖.Sullivan(以下简写为“s”):谢谢!D&S:您曾在许多不同的领域工作过,实际上,您的导师William Browder(布劳德)将您描述为一种智力上的真空吸尘器.但对您所做的事情您似乎总是有一个指导性的指导原则.

关键词：阿贝尔拓扑学真空吸尘器代数学沙利文布劳德动力学几何学

2021年Abel奖获得者László Lovász和Avi Wigderson访谈录(Ⅰ)

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数学译林 2022年第1期41卷 18-28页

作者： BjФrn Ian Dundas christian f.skau 陆柱家(译) 童欣(校) 不详

Dundas&skau(以下简写为"D&S"):Lovász(罗瓦兹)教授,Wigderson(威格森)教授.首先,我们要祝贺你们成为2021年Abel(阿贝尔)奖的获得者.我们引用Abel委员会的颁奖词:“表彰他们对理论计算机科学和离散数学的基础性贡献,以及他们在将它们... 详细信息

Dundas&skau(以下简写为"D&S"):Lovász(罗瓦兹)教授,Wigderson(威格森)教授.首先,我们要祝贺你们成为2021年Abel(阿贝尔)奖的获得者.我们引用Abel委员会的颁奖词:“表彰他们对理论计算机科学和离散数学的基础性贡献,以及他们在将它们塑造成现代数学中心领域的领导作用.”

关键词：现代数学阿贝尔理论计算机科学颁奖词数学的基础性

Prospective cohort study on facial profile changes in infants with Robin sequence and healthy controls

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World Journal of Pediatrics 2024年第6期20卷 581-589页

作者： Cornelia Wiechers Julian Sowula Karen Kreutzer Christoph E.Schwarz Christina Weismann Michael Krimmel christian f.Poets Bernd Koos Department of Neonatology Tuebingen University HospitalCalwerstrasse 772076 TuebingenGermany Center for Cleft Lip Palate and Craniofacial MalformationsTuebingen University HospitalTuebingenGermany Department of Orthodontics Tuebingen University HospitalTuebingenGermany Department of Oral and Maxillofacial Surgery Tuebingen University HospitalTuebingenGermany

Background Various conservative and surgical approaches exist to treat Robin sequence(RS),but their effects on facial profile and mandibular catch-up growth are unclear.A functional treatment concept,used in our centre for 25 years,includes an individualized palatal plate with a velo-pharyngeal extension and intensive feeding *** We performed a prospective study to objectively describe facial profiles in infants with RS treated with the above *** with isolated RS were admitted to our tertiary perinatal and national referral centre for craniofacial malformations between May 2018 and Nov *** with RS received 3D-photographs during clinically indicated *** controls were recruited from Dec 2018 to Sep 2019 and received 3D-photographs every 3 *** digitally measured jaw index(JI),defined as alveolar overjet(O)x maxillary arch(U)/mandibular arch(L),and the soft tissue reference points A’-point,Nasion’,B’-point angle(ANB’),describing the relative position of maxilla to mandible,were *** mixed models were used to examine time trajectories in JI and ANB’.Results A total of 2073D images,obtained in 19 infants with RS and 32 controls,were *** and ANB’decreased over time in both groups[for JI−0.18(95%CI−0.25 to−0.10);for ANB’:−0.40°per month[(95%CI−0.48 to−0.32)]]but remained lower in controls[for JI−2.5(95%CI−3.2 to−1.8);for ANB’-1.7°(95%CI−2.4 to−1.0)].Also,the ANB’model showed a significant effect of the interaction term diagnosis x *** Based on longitudinal 3D images,we describe changes in objective parameters of facial profile in infants with and without RS during the first year of *** findings indicate catch-up growth in infants treated for RS.

关键词： Infant Mandibular catch-up growth Pre-epiglottic Baton Plate Robin sequence Three-dimensional photography

Ray tracing particle image velocimetry-Challenges in the application to a packed bed

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Particuology 2024年第1期84卷 194-208页

作者： Christin Velten Mirko Ebert christian Lessig Katharina Zahringer Lehrstuhl für Strömungsmechanik und Strömungstechnik Otto-von-Guericke-Universität Magdeburg39106MagdeburgGermany Institut für Simulation und Graphik Otto-von-Guericke-Universität Magdeburg39106MagdeburgGermany

Ray tracing Particle Image Velocimetry(RT-PIV)is an optical technique for high resolution velocity measurements in challenging optical systems,such as transparent packed beds,that uses ray tracing to correct for distortions introduced by transparent geometries in the light *** ray tracing based correction is a post processing step applied to the raw PIV particle images before classical PIV *** this study,RT-PIV is performed in the top layer of a body centred cubic(bcc)sphere packing with gaseous flow,where optical access is obtained by the use of transparent N-BK7 glass balls with a diameter of d=40 ***-PIV introduces new experimental and numerical challenges,for example a limited field of view,illumination difficulties,a very large required depth of field and high sensitivity to geometric parameters used in the ray tracing *** challenges and their implications are the main scope and discussed in the present ***,the validation of the ray tracing reconstruction step is presented and examples for the obtained corrected vector fields in a packed bed are *** results show the strength of the method in reconstructing velocity fields behind transparent spheres that would not have been accessible by optical measurement techniques without the ray tracing correction.

关键词： Ray tracing particle image velocimetry(RT-PIV) Transparent spherical particles Packed bed Distortion correction Gas flow

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Abel奖得主John Tate访谈录

数学译林 2024年第2期43卷 119-130页

作者： Martin Raussen christian skau 张浩(译) 赵晓燕(译) 林开亮(校) 不详

1.教育Raussen&skau(以下简写为“R&S”):Tate(泰特,1925-2019(译注))教授,您因对数论的决定性和持久性影响而被评选为今年的Abel(阿贝尔)奖获奖者.在开始向您提问之前,我们首先对您取得这一成就表示热烈祝贺.您于1925年出生在美国的明... 详细信息

1.教育Raussen&skau(以下简写为“R&S”):Tate(泰特,1925-2019(译注))教授,您因对数论的决定性和持久性影响而被评选为今年的Abel(阿贝尔)奖获奖者.在开始向您提问之前,我们首先对您取得这一成就表示热烈祝贺.您于1925年出生在美国的明尼阿波利斯.您的父亲是明尼苏达大学的物理学教授.我们猜测他影响了您对自然科学和数学的兴趣,是这样吗?

关键词：明尼苏达大学明尼阿波利斯物理学教授阿贝尔

Melt flow,heat transfer and solidification in a flexible thin slab continuous casting mold with vertical-combined electromagnetic braking

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Journal of Iron and Steel Research International 2024年第2期31卷 401-415页

作者： Lin Xu Ze-feng Han christian Karcher En-gang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang110819LiaoningChina Key Laboratory of Liaoning Province for Clean Combustion Power Generation and Heating Technology Shenyang Institute of EngineeringShenyang110136LiaoningChina Institute of Thermodynamics and fluid Mechanics Technische Universität IlmenauIlmenau98684Germany

During continuous casting of steel slabs,the application of electromagnetic braking technology(EMBr)provides an effective tool to influence solidification by controlling the pattern of melt flow in the ***,the quality of the final product can be improved considerably.A new electromagnetic braking(EMBr)method,named vertical-combined electromagnetic braking(VC-EMBr),is proposed to be applied to a flexible thin slab casting(fTSC)*** evaluate the beneficial effects of the VC-EMBr,the melt flow,heat transfer,and solidification processes in the fTSC mold are studied by means of numerical *** detail,a Reynolds-averaged Navier–Stokes turbulence model together with an enthalpy-porosity approach was *** numerical findings are compared with respective simulations using the traditional *** results demonstrate that the application of the VC-EMBr contributes significantly to preventing relative slab *** contrast to the Ruler-EMBr,the additional vertical magnetic poles of the VC-EMBr preferentially suppress the direct impact of jet flow on the narrow face of fSTC mold and considerably diminish the level fluctuation near the meniscus *** instance,by applying a magnetic flux density of 0.3 T,the maximum amplitude of meniscus deflection reduces by about 80%.Moreover,the braking effect of the VC-EMBr effectively improves the homogeneity of temperature distribution in the upper recirculation region and increases the solidified shell thickness along the casting *** this basis,the newly proposed VC-EMBr shows a beneficial effect in preventing relative slab defects for fTSC thin slab continuous casting.

关键词： Electromagnetic braking Mold Melt flow Heat transfer Solidification

Wear dependent virtual flow rate sensor for progressing cavity pumps with deformable stator

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Petroleum Science 2024年第2期21卷 1346-1353页

作者： Jens Müller Sebastian Leonow Johannes Schulz christian Hansen Martin Monnigmann Ruhr-Universitat Bochum Universit atsstraûe 150Bochum44801Germany SEEPEX GmbH Scharnh olzstraûe 344Bottrop46240Germany

This contribution presents a novel wear dependent virtual flow rate sensor for single stage single lobe progressing cavity pumps. We study the wear-induced material loss of the pump components and the impact of this material loss on the volumetric efficiency. The results are combined with an established backflow model to implement a backflow calculation procedure that is adaptive to wear. We use a laboratory test setup with a highly abrasive fluid and operate a pump from new to worn condition to validate our approach. The obtained measurement data show that the presented virtual sensor is capable of calculating the flow rate of a pump being subject to wear during its regular operation.

关键词： Backflow Progressing cavity pump Virtual sensor Wear