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自然利率成为货币政策的重要参考指标

中国金融 2024年第16期 13-15页

作者：托马斯·乔丹肖林(译) 瑞士中央银行中国人民银行广东省分行

近年来,自然利率再次成为货币政策的重要参考指标。测算自然利率,计算其与实际利率的差值有助于更好地评估货币政策立场。然而,自然利率的测算存在着较大不确定性,这可能会对政策效果评估产生影响和误导。我将从实际利率的演变开始,结... 详细信息

近年来,自然利率再次成为货币政策的重要参考指标。测算自然利率,计算其与实际利率的差值有助于更好地评估货币政策立场。然而,自然利率的测算存在着较大不确定性,这可能会对政策效果评估产生影响和误导。我将从实际利率的演变开始,结合瑞士的实例,介绍瑞士中央银行如何对自然利率这项不确性指标进行测算并在实践中加以应用。

关键词：实际利率自然利率中央银行政策效果评估货币政策不确性不确定性参考指标

Magnetically assisted gas-solid fluidization in a tapered vessel:Part II Dimensionless bed expansion scaling

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Particuology 2009年第1期7卷 183-192页

作者： jordan Hristov Department of Chemical Engineering University of Chemical Technology and Metallurgy

The article presents an effort to create dimensionless scaling correlations of the overall bed porosity in the case of magnetically assisted fluidization in a tapered vessel with external transverse magnetic field. This is a stand of portion of new branch in the magnetically assisted fluidization recently created concerning employment of tapered vessels. Dimensional analysis based on ＂pressure transform＂ of the initial set of variables and involving the magnetic granular Bond number has been applied to develop scaling relationships of dimensionless groups representing ratios of pressures created by the fluid flow, gravity and the magnetic field over an elementary volume of the fluidized bed. Special attention has been paid on the existing data correlations developed for non-magnetic beds and the links to the new ones especially developed for tapered magnetic counterparts. A special dimensionless variable Xp = （Ar△Dbt）1/3√RgMQ combining Archimedes and Rosensweig numbers has been conceived for porosity correlation. Data correlations have been performed by power-law, exponential decay and asymptotic functions with analysis of their adequacies and accuracies of approximation.

关键词： Fluidization Magnetization FIRST Tapered bed Dimensional analysis Pressure transform of variables Magnetic granular Bond number Rosensweig number Porosity correlations

Magnetic field assisted fluidization—Dimensional analysis addressing the physical basis

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China Particuology 2007年第1期5卷 103-110页

作者： jordan Hristov Department of Chemical Engineering University of Chemical Technology and Metallurgy Sofia 1756 8 "Kliment Ohridsky" Boulevard Bulgaria

This paper originates a discussion on dimensional analysis and scaling in magnetically assisted fluidized beds. Basic examination of process variables, merging mechanical and magnetic units, allows the conversion of mixed sets of variables into unified terms representing surface forces as effects of the fields contributing to the assisted fluidization behaviour. This transformation is termed ＂pressure transform＂ since the new variables are all characteristic pressures generated by three basic fields： gravity, magnetic and fluid flow. This approach addresses the physical basis in terms of dimensionless groups rather than formal algebraic manipulations pertinent to classical dimensional analysis. Basic dimensionless group termed granular magnetic Bond number is introduced as the ratio of characteristic pressures of gravity and of magnetic field. This analysis also provides a set of named dimensionless numbers characterizing magnetic field assisted fluidization such as Filippov number, Rosensweig number, Kwauk number and Siegell number, derived as ratios of characteristic pressures.

关键词： Magnetic field assisted fluidization (MFAF) Dimensional analysis Bond number

Magnetically stabilized bed dust filters—Analysis through variable length scale approach

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China Particuology 2007年第1期5卷 121-129页

作者： jordan Hristov Department of Chemical Engineering University of Chemical Technology and Metallurgy 1756 Sofia 8 Kl. Ohridsky blvd. Bulgaria

Magnetically stabilized beds are packed beds subjected to fluid-driven deformation and controlled by magnetically induced interparticle forces. This paper deals with magnetically stabilized beds as deformable porous media and describes their application in dust filtration. The Richardson-Zaki scaling law, U/Ut = ε^n describes the field controlled bed expansion via the exponent n, that yields a porosity-dependent flow length scale dc = dpε^n. The paper addresses two issues：（i） deformation characteristics by assuming homogeneous bed expansion and a definition of bed variable flow length scale; （ii） dust filtration characteristics such as filter coefficient, specific deposit and filtration efficiency expressed in terms of the variable flow length scale and illustrated by experimental data.

关键词： Magnetic field Magnetically stabilized bed filter Scaling Richardson-Zaki law Variable length scale Dust filtration Filter length scale

Physicochemical Analysis of Locally Made Yoghurt (Kossam) Commercialised in the City of Douala-Cameroon

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Open Journal of Physical Chemistry 2024年第3期14卷 49-60页

作者： Sidoine Sadjeu Tchakouteu Kang Costly Eha-Kang François Siewe Humphrey Ngole jordan Wabo Blandine Penn Sandra Fokam Thelma Njuikui Yimeli Rodiah Fresnell Tcheuffa Bertin Sone Enone Department of Biomedical and Technical Science Higher Institute of Applied Sciences/University Institute of the Gulf of Guinea of Douala Douala Cameroon Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Pharmaco-Chemistry and Natural Substances Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon

Yogurt is a traditional dairy product well known in all the regions of the world. In Cameroon, the most popularly known type is “kossam” also called curdled milk. Kossam is a set of milk based beverage from northern Cameroon presenting great symbolic, economic and social values for local population [1]. 150 Kossam samples were collected from neighborhoods of PK8, Bonamoussadi, Nyalla, cite des palmier, Deido and Bedi community and later on reconstituted into 50 different samples of 350 mL, each containing 1/3 of 3 individual samples. They were analyzed for their physiochemical properties such as: PH, titratable acidity, density, brix and dry matter using most at times the standard Association of Official Analytical Chemists (AOAC) methods with slight modifications and results compared to a licensed brand sold in the Cameroonian market. The results of the study showed that, the physico-chemical properties of the locally made yogurts were different within the different samples. Analysis of variance revealed a significant difference in the levels of the parameters analyzed in the different yogurt samples (p −1 Kg/L), Brix (8˚ - 24˚B), Dornic (23˚ - 160˚D). others contents per 100 g fresh matter are as follows: dry matter (average mean of 16.54%). Hence, the significant variations in the physico-chemical properties of kossam are a call for concern since as it impacts on the health of the population consuming this product.

关键词： Kossam Physicochemical Analysis Brix Titratable Acidity

Particle elasticity influences polymeric artificial antigen presenting cell effectiveness in vivo via CD8+T cell activation,macrophage uptake,and the protein corona

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Nano Research 2024年第10期17卷 9052-9064页

作者： Savannah E.Est-Witte Sydney R.Shannon Dennis H.Gong Kaitlyn G.Calabresi Jawaun J.Harris Kaitlyn Storm Edwin J.Yoo Ariel Isser Vivek P.Jani Natalie K.Livingston Mary O.Omotoso Kelly Rhodes Elana Ben-Akiva Randall A.Meyer Zoe T.Hsieh Simone Sidoli Stephany Y.Tzeng Jonathan P.Schneck jordan J.Green Translational Tissue Engineering Center Institute for NanobiotechnologyDepartment of Biomedical EngineeringJohns Hopkins School of Medicine400 N BroadwayBaltimoreMD 21231USA Institute for Cell Engineering Department of PathologyJohns Hopkins School of Medicine733 N BroadwayBaltimoreMD 21205USA Department of Biochemistry Albert Einstein College of MedicineThe BronxNew York CityNY 10461USA

Adoptive cell therapy(ACT)is an immunotherapy strategy for cancer that has seen widespread clinical *** ACT,patient-derived lymphocytes are stimulated with the antigen of interest ex vivo,proliferated,then returned to the patient to initiate an antigen-specific antitumor *** effective,this process is resource-intensive and logistically impossible for many *** artificial antigen presenting cells(aAPCs)offer a potential“off-the-shelf”alternative to ex vivo *** particulate aAPCs perform well in vitro,they have had limited success in vivo due to poor bioavailability after *** to bioavailability include rapid clearance,unfavorable biodistribution,and inadequate interactions with CD8+T cells at sites of *** properties such as elasticity have been shown to vastly impact the bioavailability and particle-cell interactions,but this has yet to be investigated in the context of aAPCs for in vivo T-cell *** literature likewise indicates that biomaterial properties,especially elasticity,can modulate T-cell activation in *** the goal of creating a more biomimetic,next-generation particulate aAPC,we developed a poly(ethylene)glycol hydrogel particle platform with tunable elasticity to investigate the impact of elasticity on antigen-specific T cell activation for in vivo adoptive *** this knowledge,we were able to gain more precise control over in vivo T cell activation and investigate possible mechanisms including the effects of aAPC elasticity on T cell binding,macrophage uptake,and the protein corona.

关键词： adoptive cell therapy artificial antigen presenting cells particle drug delivery elasticity protein corona poly(ethylene glycol)

An overview of separation by magnetically stabilized beds:State-of-the-art and potential applications

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China Particuology 2007年第1期5卷 11-18页

作者： jordan Hristov Ludmil Fachikov Department of Chemical Engineering University of Chemical Technology and Metallurgy 1756 Sofia 8 Kl. Ohridsky Blvd. Bulgaria Department of Electrochemistry University of Chemical Technology and Metallurgy 1756 Sofia 8 Kl. Ohridsky Blvd. Bulgaria

This article deals with problems relevant to implementation of magnetically stabilized beds （MSB） as separation devices. The main issues discussed are： bed mechanics, bed structure, possibilities to create controllable filter media, etc. As examples several separation techniques are discussed： dust filtration-magnetic and non-magnetic, ion-exchange, copper cementation, yeast filtration from biological liquids, particle separation by density and magnetic properties, dangerous wastes removal. Only key publications will be quoted that provide a basis for further reading and study and relevant information.

关键词： Magnetically stabilized bed Separation Overview Potential application

Plasma Spray Forming of Nanostructured Composite Coatings

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Journal of Materials Science & Technology 2002年第3期18卷 287-288页

作者： XianliangJIANG EricH.jordan 等 InstituteofSurfaceandCoatingsTechnology CentralSouthUniversityChangsha410083China InstituteofMatrialsScience UniversityofConnecticutStorrsCT06269USA

The nanostructure composite coating is obtained via plasma spraying of Al2O3-13 wt pct TiO2 powder. Brittle and hard lamella results from melted nanostructured powder. Ductile nanostructured matrix forms from unmelted nanostructured particles. Through the adjustment of constituent and nanostructure, hardness/strength and toughness/ductility are balanced and overall properties of the structure composite are achieved.

关键词： Plasma spray forming Nanostructured coating Mechanical Property

Preliminary study on the influence of in situ filter size in CFD-DEM transfer kernel

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Particuology 2020年第4期18卷 205-209页

作者： William D.Fullmer jordan Musser National Energy Technology Laboratory MorgantownWV26507USA Leidos Research Support Team MorgantownWV26507USA

An unknown in coupled Eulerian-Lagrangian models for particle flow,such as CFD-DEM,which has received fairly little attention in the literature to date is the size of the filter width in the transfer *** work provides a preliminary glimpse at how this parameter can influence the solution in cold-flow,unbounded *** to previously published direct numerical simulation data is used to suggest an appropriate range for this parameter.

关键词： CFD-DEM High-resolution Lagrangian-Eulerian kernel