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Passive electrochemical hydrogen recombiner for hydrogen safety systems:prospects

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Nuclear Science and Techniques 2023年第6期34卷 215-224页

作者： A.v.Avdeenkov d.G.Bessarabov d.G.Zaryugin All Russian Research Institute for Nuclear Power Plants Operation JSC 25 Ferganskaya Str.MoscowRussia109507 HySA Center Faculty of EngineeringNorth-West UniversityPotchefstroom2520South Africa State Atomic Energy Corporation Rosatom 24 Bolshaya Ordynka Str.MoscowRussia119017

This paper presents the concept of a passive electrochemical hydrogen recombiner(PEHR).The reaction energy of the recombination of hydrogen and oxygen is used as a source of electrical energy according to the operating principle for hydrogen fuel cells to establish forced circulation of the hydrogen mixture as an alternative to natural circulation(as is not utilized in conventional passive autocatalytic hydrogen recombiners currently used in nuclear power plants(NPPs)).The proposed concept of applying the physical operation principles of a PEHR based on a fuel cell simultaneously increases both productivity in terms of recombined hydrogen and the concentration threshold of flameless operation(the‘ignition’limit).Thus,it is possible to reliably ensure the hydrogen explosion safety of NPPs under all conditions,including beyond-design *** experimental setup was assembled to test a laboratory sample of a membrane electrode assembly(MEA)at various hydrogen concentrations near the catalytic surfaces of the electrodes,and the corresponding current–voltage characteristics were *** simplest MEA based on the Advent P1100W PBI membrane demonstrated stable performance(delivery of electrical power)over a wide range of hydrogen concentrations.

关键词： Recombiner Catalytic ignition Hydrogen explosion safety Hydrogen fuel cell Membrane electrode assembly

Highly transparent ceramics for the spectral range from 1.0 to 60.0μm based on solid solutions of the system AgBr-AgI-TlI-TlBr

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Chinese Optics Letters 2021年第2期19卷 51-56页

作者： L.v.Zhukova d.d.Salimgareev A.E.Lvov A.A.Yuzhakova A.S.Korsakov d.A.Belousov K.v.Lipustin v.M.Kondrashin Ural Federal University named after the first President of Russia B.N.Yeltsin Ekaterinburg 620002Russia

The article is devoted to the technology for obtaining optical ceramics of Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems and manufacturing samples with different *** new heterophase crystal ceramics are transparent without absorption windows in the spectral range from 1.0 to 60.0μ*** the ceramics’transparency spectra based on the Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems fusibility diagrams,with an increase in the thallium halides mass fraction,as well as the replacement of the bromine ion with iodine,the maximum transparency shifts to a long infrared region.

关键词： solid solution silver halides monovalent thallium

Thermodynamic Assessment of the ZrO_2-CeO_2 and ZrO_2-CeO_(1.5) Binary System

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Journal of Materials Science & Technology 2002年第4期18卷 325-327页

作者： ShuigenHUANG O.v.d.Biest 等 dpet.ofMaterialsScienceandEngineering ShanghaiUniversityShanghai200072China dept.ofMaterialsandMetallurgy KatholiekeUniversiteitLeuvenB-3001HeverleeBelgium

An optimal set of thermodynamic parameters of the ZrO2-CeO1.5 system has been obtained using phase diagram data by modern CALPHAd (CALculation of PHAse diagrams) technique. The liquid and other solid solution phases were regarded as substitutional solution. The ordered Zr2Ce2O7 phase was treated as a stoichiometric compound. The ZrO2-CeO2 system has been re-optimized with new reference state. A comparison between the ZrO2-CeO2 system and ZrO2-CeO1.5 system has been made through calculation. With the calculation, the experimental information is well reproduced and a good agreement is obtained.

关键词： ZrO2-CeO1.5 thermodynamic Phase diagram

ON REdUCTION OF MULTICOMPONENT COSMOLOGY TO TOdA LATTICE

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Chinese Physics Letters 1990年第3期7卷 97-100页

作者： v.d.Ivashchuk v.N.Melnikov USSR State Committee for Standards 9 Leninsky prospectMoscow 117049USSR

We prove that Gibbons-Maeda reduction of two-component cosmology to the Toda lattice can not be generalyzed for n-component case.

关键词： MULTI lattice component

Modeling the temperature shock of elastic elements using a one-dimensional model of thermal conductivity

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International Journal of Modeling, Simulation, and Scientific Computing 2020年第6期11卷 220-228页

作者： d.A.Belousova v.v.Serdakova Multidisciplinary Engineering Center Joint Stock Company“SMARTEC”Samara Russia Amur State University BlagoveshchenskRussia

This paper considers the task of evaluating micro-accelerations arising due to the temperature shock of large elastic elements when a small spacecraft leaves the Earth’s *** this case, a one-dimensional model of thermal conductivity is used. Its solution wasobtained by the method of direct approximation with the construction of differenceschemes. It is shown that the accuracy of estimating micro-accelerations is commensurate with the accuracy of solving by a three-dimensional model of thermal *** proposed model allows reducing the time to obtain estimates and significantly simplifies the task at hand. The results of the work can be used in the formation of thedynamic characteristics of a small spacecraft for technological purposes.

关键词： Small spacecraft simulation of temperature shock micro-acceleration gravitationally sensitive processes

SCIENTIFIC PRINCIPLES FOR MOdIFICATION OF WATER-SOLUBLE POLYMERS. FORMATION OF MACROMOLECULAR COMPLEXES

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Chinese Journal of Polymer Science 1998年第3期16卷 268-278页

作者： PAUTOv v.d. ANUFRIEvA E.v. KRAKOvYAK M.G. Institute of Macromolecular Compounds RAS Bolshoy pr. 31 St. Petersburg 199004 RussiaInstitute of Macromolecular Compounds RAS Bolshoy pr. 31 St. Petersburg 199004 RussiaInstitute of Macromolecular Compounds RAS Bolshoy pr. 31 St. Petersburg 199004 Russia

The study of nanosecond dynamics of macromolecules with the lumines-cent methods make it possible to investigate the formation and functioning of polymericcomplexes, polymeric conjugates and macromolecular metal complexes, which are widelyused for solving many practical tasks. The nanosecond dynamics of macromolecules are ahighly sensitive indicator of interpolymer complexes (IPC) formation. It enables us to solvethe problems of studying IPC formation and stability and to investigate the interpolymerreactions of exchange and substitution. The investigation of changes in the rotational mo-bility of globular protein molecules as a whole makes it possible to determine the complexcomposition and its stability, and to control the course of polymer-protein conjugate forma-tion reaction. The nanosecond dynamics of polymers interacting with surfacants' ions (S)are the sensitive indicator of the S-polymer complex formation. A method for determin-ing the equilibrium constants of the S-polymer complex formation was developed on thebasis of the study of polymer chains mobility. It is established that nanosecond dynamicsinfluences the course of chemical reactions in polymer chains. Moreover, the marked effectof the nanosecond dynamics is also revealed in the study of photophysical processes (theformation of excimers and energy migration of electron excitation) in polymers with pho-toactive groups. It was found that the efficiency of both processes increases with increasingthe mobility of side chains, the carriers of photoactive groups.

关键词： Modification of water-soluble polymers Formation of complexes

Endoscopic management of biliary strictures after liver transplantation

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World Journal of Gastroenterology 2009年第30期15卷 3725-3733页

作者： Emmanuelle d Williams Peter v draganov division of Gastroenterology University of FloridaGainesvilleFL 32610-0214United States

Bile duct strictures remain a major source of morbidity after orthotopic liver transplantation (OLT). Biliary strictures are classifi ed as anastomotic or non-anastomotic strictures according to location and are defi ned by distinct clinical behaviors. Anastomotic strictures are localized and short. The outcome of endoscopic treatment for anastomotic strictures is excellent. Nonanastomotic strictures often result from ischemic and immunological events, occur earlier and are usually multiple and longer. They are characterized by a far less favorable response to endoscopic management, higher recurrence rates, graft loss and need for retransplantation. Living donor OLT patients present a unique set of challenges arising from technical factors, and stricture risk for both recipients and donors. Endoscopic treatment of living donor OLT patients is less promising. Current endoscopic strategies for biliary strictures after OLT include repeated balloon dilations and placement of multiple side-by-side plastic stents. Lifelong surveillance is required in all types of strictures. despite improvements in incidence and long term outcomes with endoscopic management, and a reduced need for surgical treatment, the impact of strictures on patients after OLT is signifi cant. Future considerations include new endoscopic technologies and improved stents, which could potentially allow for a decreased number of interventions, increased intervals before retreatment, and decreased reliance on percutaneous and surgical modalities. This review focuses on the role of endoscopy in biliary strictures, one of the most common biliary complications after OLT.

关键词： Anastomotic strictures Bile duct diseases Endoscopic retrograde cholangiopancreatography Orthotopic liver transplantation Surgical anastomosis

Pancreatic fistula after pancreatectomy:Evolving definitions,preventive strategies and modern management

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World Journal of Gastroenterology 2008年第38期14卷 5789-5796页

作者： Shailesh v Shrikhande Melroy A d'Souza department of GI and HPB Surgical Oncology Tata Memorial HospitalMumbai 400-012 India

Pancreatic resection is the treatment of choice for pancreatic malignancy and certain benign pancreatic disorders. However, pancreatic resection is technically a demanding procedure and whereas mortality after a pancreaticoduodenectomy is currently d high-volume centers, post-operative morbidity is considerable, about 30%-50%. At present, the single most significant cause of morbidity and mortality after pancreatectomy is the development of pancreatic leakage and fistula (PF). The occurrence of a PF increases the length of hospital stay and the cost of treatment, requires additional investigations and procedures, and can result in life-threatening complications. There is no universally accepted definition of PF that would allow standardized reporting and proper comparison of outcomes between different centers. However, early recognition of a PF and prompt institution of appropriate treatment is critical to the prevention of potentially devastating consequences. The present article, reviews the evolution of post resection pancreatic fistula as a concept, and discusses evolving definitions, the current preventive strategies and the management of this problem.

关键词： Pancreatic fistula Pancreaticoduodenectomy Pancreatic anastomosis Pancreatic anastomotic failure Complications

Stability Analysis of Network Controlled Temperature Control System with Additive delays

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Computer Modeling in Engineering & Sciences 2018年第3期114卷 321-334页

作者： v.venkatachalam d.Prabhakaran department of Chemical Engineering Coimbatore Institute of TechnologyCoimbatore-641014India

This paper presents,using Lyapunov-Krasovskii functional technique combined with reciprocal convex lemma is considered for a networked control temperature control system with additive *** the stability analysis,a new LK functional is assumed,and take the time-derivative of the(LK)functional,using reciprocal convex combination technique was employed to obtain less conservative stability ***,the proposed stability analysis culminates into a stability criterion in the LMI(linear matrix inequalities)*** results obtained are in accordance with the theoretically obtained in the temperature control system and they are closer to the standard benchmark temperature-control system.

关键词： delay-dependent stability time-varying additive delays temperature control heat exchanger lyapunov-krasovskii functional linear matrix inequality reciprocal convex lemma