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A fractal concentrator of direct and indirect sunlight

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Clean Energy 2020年第4期4卷 305-315页

作者： ilia Katardjiev Department of Electrical Engineering Uppsala UniversityUppsala 75121Sweden

A novel concept for concentrating both direct and indirect sunlight employing a combination of waveguiding and refractive optics is *** specifically,it is based on both the individual and the collective focusing effects of an array of refractive optical elements of specific *** analytical framework and design principles regarding the geometry of the optical elements taking into account Fresnel reflection and refraction are *** principle of operation along with loss mechanisms and acceptance angles are discussed in ***-tracing simulations of a light concentrator designed accordingly indicate transmittance>90%with acceptance angles of≤65°at 3 suns for moderate refractive *** is further numerically demonstrated that the new approach allows the utilization of the dominant fraction of the solar radiation by harvesting the waste heat in addition to photovoltaic conversion with an operating energy efficiency for diffuse light>70%.

关键词： concentrator diffuse light non-imaging optics solar harvesting

Model of fractured medium and nondestructive control of composite materials

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Chinese Journal of Aeronautics 2024年第2期37卷 93-99页

作者： Vasily GOLUBEV ilia NiKiTiN Katerina BEKLEMYSHEVA Department of Computers Science and Numerical Mathematics Moscow Institute of Physics and TechnologyDolgoprudny 141700Russia Mathematical Modeling and Management Department of InformatizationInstitute of Computer Aided Design RASMoscow 123056Russia

Non-destructive testing of composites is an important issue in the modern aircraft *** are susceptible to the barely visible impact damage which can affect the residual strength of the material and occurs both during production and *** continuum model for describing the damaged zone is *** slip theory relations used for a continuous distribution of slip planes are *** the initial stage,the isotropic background model is *** model allows the material slippage along the fractures based on the Coulomb friction law with the small viscous *** this regime,the govern system of equations becomes *** overcome this difficulty,the explicit-implicit grid-characteristic scheme is *** standard ultrasound diagnostic procedure of damaged composite materials is successfully *** with the trivial free-surface fracture model,different reactions on the compression and stretch waves are *** approach provided an effective way for the simulation of complex dynamic behavior of damage zones.

关键词： Non-destructive testing Composite materials Numerical modeling Continuum model Grid-characteristic method

Low-power emerging memristive designs towards secure hardware systems for applications in internet of things

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Nano Materials Science 2021年第2期3卷 186-204页

作者： Nan Du Heidemarie Schmidt ilia Polian Department Nano Device Technology Fraunhofer Institute for Electronic Nano SystemsTechnologie-Campus 309126ChemnitzGermany Faculty of Electrical Engineering and information Technology Chemnitz University of Technology(TU Chemnitz)Straße der Nationen 6209126ChemnitzGermany Department of Quantum Detection Leibniz Institute of Photonic Technology(IPHT)Albert-Einstein-Str.907745JenaGermany institute for Solid State Physics Friedrich Schiller University JenaFürstengraben 107743JenaGermany institute of Computer Engineering and Computer Architecture(iTi) University of StuttgartPfaffenwaldring 4770569StuttgartGermany

Emerging memristive devices offer enormous advantages for applications such as non-volatile memories and inmemory computing(iMC),but there is a rising interest in using memristive technologies for security applications in the era of internet of things(ioT).in this review article,for achieving secure hardware systems in ioT,lowpower design techniques based on emerging memristive technology for hardware security primitives/systems are *** reviewing the state-of-the-art in three highlighted memristive application areas,*** non-volatile memory,memristive reconfigurable logic computing and memristive artificial intelligent computing,their application-level impacts on the novel implementations of secret key generation,crypto functions and machine learning attacks are explored,*** the low-power security applications in ioT,it is essential to understand how to best realize cryptographic circuitry using memristive circuitries,and to assess the implications of memristive crypto implementations on security and to develop novel computing paradigms that will enhance their *** review article aims to help researchers to explore security solutions,to analyze new possible threats and to develop corresponding protections for the secure hardware systems based on low-cost memristive circuit designs.

关键词： Memristive technology Nanoelectronic device Low-power consumption Miniaturization Nonvolatility Reconfigurability in memory computing Artificial intelligence Hardware security primitives Machine learning-related attacks and defenses

Pediatric-type follicular lymphoma in a Crohn’s disease patient receiving anti-α4β7-integrin therapy:A case report

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World Journal of Gastroenterology 2023年第43期29卷 5865-5871页

作者： Keval Yerigeri ilia Buhtoiarov internal Medicine-Pediatrics Case Western Reserve University/MetroHealthClevelandOH 44109United States Pediatric Hematology/Oncology and Bone Marrow Transplantation Cleveland Clinic Children’sClevelandOH 44106United States

BACKGROUND patients with autoimmune conditions receiving immunosuppressants are at risk of non-Hodgkin lymphomas(NHL).Vedolizumab(anti-α4β7-integrin antibody),a treatment-of-choice for Crohn’s disease(CD),reduces inflammatory lymphocyte trafficking into the intestinal *** effect is believed to be confined to the *** SUMMARY We report the case of a CD patient on vedolizumab for five years who developed pediatric-type follicular ***-up prior to therapy revealed a reduction in circulating T-lymphocytes and their suppressed response to ***,cyclophosphamide,vincristine,and prednisone chemoimmunotherapy resulted in durable lymphoma remission,and vedolizumab treatment was *** the patient’s T-lymphocyte population and immunoglobulin production recovered,the T-lymphocyte mitogen response remained *** This patient’s NHL may be linked to receiving anti-α4β7 *** research could be beneficial to determine if proactive surveillance for NHL and other systemic diseases is indicated in patients on vedolizumab.

关键词： Pediatric-type follicular lymphoma Crohn’s disease Vedolizumab immunosuppression Non-Hodgkin lymphoma Case report

GRAFTED STYRENE-DiViNYLBENZENE COPOLYMERS CONTAiNiNG BENZALDEHYDES AND THEiR WiTTiG REACTiONS WiTH VARiOUS PHOSPHONiUM SALTS

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Chinese Journal of Polymer Science 2005年第6期23卷 651-656页

作者： Adriana Popa Gheorghe ilia Aurelia pascariu Smaranda iliescu Nicoleta Plesu institute of Chemistry Romanian Academy Bd.Mihai Viteazul 24 R-300223 TimisoaraRomania

A chloromethylated styrene-divinylbenzene copolymer support system functionalized with 4-benzaldehyde and 2-benzaldehyde was prepared. The degree of functionalization with aldehyde groups is well suited for the subsequent use of the products as Wittig reagents. The polymer bound aldehyde was reacted with Wittig reagents to give olefin groups grafted on styrene-divinylbenzene copolymers. The reactions were carded out in phase transfer catalysis conditions. A simple procedure for the calculation of the degree of functionalization and the statistical modeling of the structural repetitive unit of the copolymer are reported.

关键词： Chloromethylated styrene-divinylbenzene copolymer 4-Benzaldehyde 2-Benzaldehyde Phase-transfer catalysis Wittig reaction

Fifty years of capital markets research in accounting:Achievements so far and opportunities ahead

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China Journal of Accounting Research 2020年第3期13卷 237-249页

作者： ilia D.Dichev Goizueta Business School Emory UniversityUSA

This paper reviews the literature on capital markets research in accounting over the last 50 *** than trying to be comprehensive,the review focuses on selected areas,and strives to be *** first major takeaway is that the literature has made great progress,especially on the technical *** second takeaway is that great opportunities remain,especially in using Big Data,looking more closely into the accrual process,and in issues related to standard setting.

关键词： capital looking market

Protecting artificial intelligence iPs:a survey of watermarking and fingerprinting for machine learning

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CAAi Transactions on intelligence Technology 2021年第2期6卷 180-191页

作者： Francesco Regazzoni paolo palmieri Fethulah Smailbegovic Rosario Cammarota ilia Polian University of Amsterdam Amsterdam The Netherlands ALaRi-USi LuganoSwitzerland University College Cork CorkIreland Delft University of Technology The Netherlands intel Labs San DiegoUSA University of Stuttgart StuttgartGermany

Artificial intelligence(Ai)algorithms achieve outstanding results in many applicationdomains such as computer vision and natural language processing The performance ofAl models is the outcome of complex and costly model architecture design and ***,it is paramount for model owners to protect their Ai models frompiracy-model cloning,illegitimate distribution and *** protection mechanisms havebeen applied to Al models,and in particular to deep neural networks,to verify themodel ***-of-the-art Ai model ownership protection techniques have *** pros and cons of Al model ownership protection have been *** majonity of previous works are focused on watermarking,while more advancedmethods such fingerprinting and attestation are promising but not yet explored *** study has been concluded by discussing possible research directions in thearea.

关键词： artificial computer networks

Single-crystal microplates of two-dimensional organic-inorganic lead halide layered perovskites for optoelectronics

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Nano Research 2017年第6期10卷 2117-2129页

作者： Dewei Ma Yongping Fu Lianna Dang Jianyuan Zhai ilia A. Guzei Song Jin Department of Chemistry University of Wisconsin-Madison Madison Wisconsin 53706 USA Department of Applied Physics Zhejiang University of Technology Hangzhou 310014 China

Organic-inorganic hybrid perovskites attract considerable attention owing to their applications in high-efficiency solar cells and light emission. Compared with three-dimensional perovskites, two-dimensional （2D） layered hybrid perovskites have a higher exciton binding energy and potentially higher light- emission efficiency. The growth of high-quality crystalline 2D perovskites with a well-defined nanoscale morphology is desirable because they can be suitable building blocks for integrated optoelectronics and （nano）photonics. Herein, we report the facile solution growth of single-crystal microplates of 2D perovskites based on a 2-phenylethylammonium （C6HsCH2CH2NHG PEA） cation, （PEA）2PbX- （X = Br, i）, with a well-defined rectangular geometry and nanoscale thickness through a dissolution-recrystallization process. The crystal structures of （PEA）2PbX4 are first confirmed using single-crystal X-ray diffraction. A solution-phase transport-growth process is developed to grow microplates with a typical size of tens of micrometers and thickness of hundreds of nanometers on another clean substrate different from the substrate coated with lead-acetate precursor film. Surface-topography analysis suggests that the formation of the 2D microplates is likely driven by the wedding-cake growth mechanism. Through halide alloying, the photoluminescence emission of （PEA）2Pb（Br, i）4 perovskites with a narrow peak bandwidth is readily tuned from violet （-410 nm） to green （-530 nm）.

关键词： layered lead-halide perovskite,phenylethylammonium lead-halide perovskites,microplate,nanoplate dissolution-recrystallization,photoluminescence

Combining estimators of a common parameter across samples

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Statistical Theory and Related Fields 2018年第2期2卷 158-171页

作者： Eric Slud ilia Vonta Abram Kagan Mathematics Department University of Maryland College ParkCollege ParkMDUSA Center for Statistical Research and Methodology US Census BureauWashington DCUSA Dept.of Mathematics National Technical University of AthensAthensGreece

in many settings,multiple data collections and analyses on the same topic are summarised separately through statistical estimators of parameters and variances,and yet there are scientificreasons for sharing some statistical parameters across these different *** paper summarises what is known from large-sample theory about when estimators of a common structuralparameter from several independent samples can be combined functionally,or more specificallylinearly,to obtain an asymptotically efficient estimator from the combined *** main ideais that such combination can be done when the separate-sample nuisance parameters,if anyexist,vary freely and independently of one *** issues are illustrated using data from amulti-centre lung cancer clinical *** are presented to show that separate estimatorscannot always be combined in this way,and that the functionally combined separate estimators may have low or 0 efficiency compared to the unified analysis that could be performed bypooling the datasets.

关键词： Efficient estimator estimating equation Fisher information information bound meta-analysis regular estimator