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In Situ Mineralization of Biomass-Derived Hydrogels Boosts Capacitive Electrochemical Energy Storage in Free-Standing 3D Carbon Aerogels

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Energy & Environmental Materials 2024年第2期7卷 359-371页

作者： Anjali Achazhiyath Edathil Babak Rezaei Kristoffer Almdal Stephan Sylνest Keller National Centre for Nano Fabrication and Characterization DTU NanolabTechnical University of Denmark2800LyngbyDenmark DTU Chemistry Technical University of Denmark2800LyngbyDenmark

Here,a novel fabrication method for making free-standing 3D hierarchical porous carbon aerogels from molecularly engineered biomass-derived hydrogels is *** situ formed flower-like CaCO_(3)molecularly embedded within the hydrogel network regulated the pore structure during in situ mineralization assisted one-step activation graphitization(iMAG),while the intrinsic structural integrity of the carbon aerogels was *** homogenously distributed minerals simultaneously acted as a hard template,activating agent,and graphitization *** decomposition of the homogenously distributed CaCO_(3)during iMAG followed by the etching of residual CaO through a mild acid washing endowed a robust carbon aerogel with high porosity and excellent electrochemical *** 0.5 mA cm^(-2),the gravimetric capacitance increased from 0.01 F g^(-1)without mineralization to 322 F g^(-1)with iMAG,which exceeds values reported for any other free-standing or powder-based biomass-derived carbon *** outstanding cycling stability of~104%after 1000 cycles in 1 M HClO4 was *** assembled symmetric supercapacitor device delivered a high specific capacitance of 376 F g^(-1)and a high energy density of 26 W h kg^(-1)at a power density of 4000 W kg^(-1),with excellent cycling performance(98.5%retention after 2000 cycles).In combination with the proposed 3D printed mold-assisted solution casting(3DMASC),iMAG allows for the generation of free-standing carbon aerogel architectures with arbitrary ***,the novel method introduces flexibility in constructing free-standing carbon aerogels from any ionically cross-linkable biopolymer while maintaining the ability to tailor the design,dimensions,and pore size distribution for specific energy storage applications.

关键词： biomass carbon aerogel sustainable energy materials free-standing supercapacitors

AI for conceptual architecture:Reflections on designing with text-to-text,text-to-image,and image-to-image generators

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Frontiers of Architectural research 2024年第3期13卷 593-612页

作者： Anca-Simona Horvath Panagiota Pouliou research Laboratory for Art and Technology Aalborg UniversityAalborg 9000Denmark Lighting Design Lab Aalborg UniversityCopenhagen 2450Denmark

In this paper we present a research-through-design study where we employed text-to-text,text-to-image,and image-to-image generative tools for a conceptual architecture project for the eVolo skyscraper *** trained these algorithms on a dataset that we collected and curated,consisting of texts about and images of *** describe our design process,present the final proposal,reflect on the usefulness of such tools for early-stage design,and discuss implications for future research and *** analysing the results from training the text-to-text generators we could establish a specific design brief that informed the final *** results from the image-to-image generator gave an overview of the shape grammars of previous *** results were intriguing and can assist creativity and in this way,the tools were useful for gaining insight into historical architectural data,helped shape a specific design brief,and provoked new *** reflecting on our design process,we argue that the use of language when employing such tools takes a new role and that three layers of language intertwined in our work:architectural discourse,programming languages,and *** present a map that unfolds how these layers came together as a contribution to making machine learning more explainable for creatives.

关键词： Machine learning StyleGAN2-ADA RNN TensorFlow VQGAN+clip AD journal eVolo Conceptual design Architectural design

Electroactivity of the magnetotactic bacteria Magnetospirillum magneticum AMB-1 and Magnetospirillum gryphiswaldense MSR-1

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Frontiers of Environmental Science & Engineering 2024年第4期18卷 103-110页

作者： Mathias Fessler Qingxian Su Marlene Mark Jensen Yifeng Zhang Department of Environmental and Resource Engineering Technical University of DenmarkCopenhagenDK-2800Denmark

Magnetotactic bacteria reside in sediments and stratified water *** are named after their ability to synthesize internal magnetic particles that allow them to align and swim along the Earth’s magnetic field ***,we show that two magnetotactic species,Magnetospirillum magneticum strain AMB-1 and Magnetospirillum gryphiswaldense strain MSR-1,are *** *** and *** were able to generate current in microbial fuel cells with maximum power densities of 27 and 11μW/m^(2),*** the presence of the electron shuttle resazurin both species were able to reduce the crystalline iron oxide hematite(Fe_(2)O_(3)).In addition,*** could reduce poorly crystalline iron oxide(FeOOH).Our study adds *** and *** to the growing list of known electroactive bacteria,and implies that electroactivity might be common for bacteria within the Magnetospirillum genus.

关键词： Magnetotactic bacteria Magnetospirillum magneticum Magnetospirillum gryphiswaldense Extracellular electron transfer Microbial fuel cells

Understanding intrarenal backflow: Intrarenal pressure during ureteroscopy and beyond

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Asian Journal of Urology 2024年第2期11卷 139-142页

作者： Palle J.S.Osther Susanne S.Osther Maria P.Hesselholt Sofia Byllov Søren K.Lildal Louise F.Øbro Helene Jung Urological research Center Department of UrologyVejle Hospital(a part of Lillebaelt Hospital)University Hospital of Southern DenmarkVejleDenmark Department of Regional Health research University of Southern DenmarkOdenseDenmark

The number of ureterorenoscopic procedures for upper urinary tract stone management has increased dramatically during recent years worldwide[1].Developments in flexible ureteroscope and laser technology have made it possible to successfully address larger and more complex stone scenarios *** the other hand,this means that more and more patients are exposed to the potential adverse effects of ureteroscopy[2].In general,ureteroscopy is considered a safe ***,serious complications and even deaths do occur,and these events are most likely underreported[3,4].

关键词： beyond likely ureter

Transient Stability Analysis of Grid-connected Converters in Wind Turbine Systems Based on Linear Lyapunov Function and Reverse-time Trajectory

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 782-790页

作者： Mohammad Kazem Bakhshizadeh Sujay Ghosh Guangya Yang Łukasz Kocewiak Ørsted Wind Power A/S Nesa Allé12820Denmark Technical University of denmark Anker Engelunds Vej 12800Denmark

As the proportion of converter-interfaced renewable energy resources in the power system is increasing,the strength of the power grid at the connection point of wind turbine generators(WTGs)is gradually *** research has shown that when connected with the weak grid,the stability of the traditional grid-following controlled converters will deteriorate,and they are prone to unstable phenomena such as *** to the limitations of linear analysis that cannot sufficiently capture the stability phenomena,transient stability must be *** far,standalone time-domain simulations or analytical Lyapunov stability criteria have been used to investigate transient ***,the time-domain simulations have proven to be computationally too heavy,while analytical methods are difficult to formulate for larger systems,require many modelling assumptions,and are often conservative in estimating the stability *** paper proposes and demonstrates an innovative approach to estimating the transient stability boundary via combining the linear Lyapunov function and the reverse-time trajectory *** proposed methodology eliminates the need of time-consuming simulations and the conservative nature of Lyapunov *** study brings out the clear distinction between the stability boundaries with different post-fault active current ramp rate *** the same time,it provides a new perspective on critical clearing time for wind turbine *** stability boundary is verified using time-domain simulation studies.

关键词： Lyapunov direct method non-autonomous system phase-locked loop(PLL) time trajectory reversal transient stability assessment wind turbine converter system

Hypoxia in the pulmonary vein increases pulmonary vascular resistance independently of oxygen in the pulmonary artery

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Animal Models and Experimental Medicine 2024年第2期7卷 156-165页

作者： Sigridur Olga Magnusdottir Carsten Simonsen Dan Stieper Karbing Bodil Steen Rasmussen Benedict Kjaergaard Biomedical research Laboratory Aalborg University HospitalAalborgDenmark Department of Clinical Medicine Aalborg UniversityAalborgDenmark Department of Cardiothoracic Surgery Aalborg University HospitalAalborgDenmark Department of Health Science and Technology Aalborg UniversityAalborgDenmark Department of Anesthesia and Intensive Care Aalborg University HospitalAalborgDenmark

Introduction:Hypoxic pulmonary vasoconstriction(HPV)can be a challenging clinical *** is not fully elucidated where in the circulation the regulation of resistance takes *** is often referred to as if it is in the arteries,but we hypothesized that it is in the venous side of the pulmonary ***:In an open thorax model,pigs were treated with a veno-venous extra corporeal membrane oxygenator to either oxygenate or deoxygenate blood passing through the pulmonary *** the same time the lungs were ventilated with extreme variations of inspired air from 5%to 100%oxygen,making it possible to make combinations of high and low oxygen content through the pulmonary circulation.A flow probe was inserted around the main pulmonary artery and catheters in the pulmonary artery and in the left atrium were used for pressure monitoring and blood *** different combinations of oxygenation,pulmonary vascular resistance(PVR)was ***:With unchanged level of oxygen in the pulmonary artery and reduced inspired oxygen fraction lowering oxygen tension from 29 to 6.7 kPa in the pulmonary vein,PVR was *** more extreme hypoxia PVR suddenly *** with low oxygenation in the pulmonary artery did not systematic influence PVR if there was enough oxygen in the inspired air and in the pulmonary ***:The impact of hypoxia occurs from the alveolar level and forward with the blood *** experiments indicated that the regulation of PVR is mediated from the venous side.

关键词： animal models cardiopulmonary support Hypoxic pulmonary vasoconstriction pulmonary circulation

Two hits are better than one:rational dual strategy efficiently fights neuroblastoma

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Signal Transduction and Targeted Therapy 2024年第5期9卷 1802-1804页

作者： Jacques Zimmer Camille Rolin Markus Ollert Department of Infection and Immunity Luxembourg Institute of HealthEsch-sur-AlzetteLuxembourg University of Luxembourg Esch-sur-AlzetteLuxembourg Department of Dermatology and Allergy Center Odense Research Center for Anaphylaxis(ORCA)University of Southern DenmarkOdenseDenmark

The recently published landmark paper by Bergaggio et *** Roberto Chiarle’s group in Cancer Cell1 investigates an elegant double-hit strategy to improve anti-cancer *** important approach demonstrates in a preclinical model that chimeric antigen receptor(CAR)-T cell treatment can be rendered more efficient by increasing the cell surface expression of the CAR target structure via a small molecule.

关键词： neuroblastoma Cancer

Dynamic Equivalent Modeling for Black-box Microgrids Under Multi-operating-point by Using LSTM

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 639-648页

作者： Yunlu Li Josep M.Guerrero Junyou Yang Yajuan Guan Guiqing Ma Jiawei Feng School of Electrical Engineering Shenyang University of TechnologyShenyang 110819China Department of Energy Technology Center for Research on Microgrids(CROM)Aalborg University9220 Aalborg EastDenmark

Since the high penetration of distributed energy sources complicates the dynamics of electrical power systems,accurate dynamic models are indispensable for study on the transient behavior of the microgrid(MG).In some practices,the lack of full detailed information results in failure of dif-ferential equation based dynamic modeling,which leads to a demand for a black-box MG modeling *** is a critical challenge to maintain the effectiveness of the black-box model under a wide operating range and various fault *** this paper,inspired by the mathematical equivalence between the recurrent neural network(RNN)and differential-algebraic equations(DAEs),a dynamic equivalent modeling method,using long short-term memory(LSTM),is presented to tackle this *** first,the modeling equivalence and advantages of our basic idea are ***,modeling procedures,including data preparation and design guidelines,are ***,the proposed method is applied to a multi-microgrid testing system for performance *** results,under various scenarios,reveal that the proposed modeling method has an adequate capability for representing the dynamic behaviors of a black-box MG under grid fault and operating point changing *** Terms-Deep learning,dynamic behavior,dynamic equivalent model,microgrid,neural network.

关键词： Deep learning dynamic behavior dynamic equivalent model microgrid neural network

Optimal Planning of Hybrid AC/DC Low-voltage Distribution Networks Considering DC Conversion of Three-phase Four-wire Low-voltage AC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 141-153页

作者： Bo Zhang Lu Zhang Wei Tang Gen Li Chen Wang the College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China the Electric Energy Group Department of Engineering TechnologyTechnical University of Denmark(DTU)2750 BallerupDenmark the Power Distribution Technology Center State Grid Beijing Electric Power Research InstituteBeijing 100075China

The increasing integration of distributed household photovoltaics(PVs)and electric vehicles(EVs)may further ag gravate voltage violations and unbalance of low-voltage distribu tion networks(LVDNs).DC distribution networks can increase the accommodation of PVs and EVs and mitigate mutilple pow er quality problems by the flexible power regulation capability of voltage source *** paper proposes schemes to es tablish hybrid AC/DC LVDNs considering the conversion of the existing three-phase four-wire low-voltage AC systems to DC op *** characteristics and DC conversion constraints of typical LVDNs are *** addition,converter configura tions for typical LVDNs are proposed based on the three-phase four-wire characteristics and quantitative analysis of various DC ***,an optimal planning method of hybrid AC/DC LVDNs is proposed,which is modeled as a bi-level programming model considering the annual investments and three-phase *** are conducted to verify the effectiveness of the proposed optimal planning *** ulation results show that the proposed optimal planning method can increase the integration of PVs while simultaneously reduc ing issues related to voltage violation and unbalance.

关键词： Optimal planning low-voltage distribution net work three-phase unbalance DC conversion