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Electrical programmable multilevel nonvolatile photonic random-access memory

Light(Science & Applications) 2023年第11期12卷 2325-2334页

作者： Jiawei Meng Yaliang Gui Behrouz Movahhed Nouri Xiaoxuan Ma Yifei Zhang cosmin-constantin popescu Myungkoo Kang Mario Miscuglio Nicola Peserico Kathleen Richardson Juejun Hu Hamed Dalir Volker J.Sorger Department of Electrical and Computer Engineering George Washington UniversityWashington DC 20052USA Florida Semiconductor Institute University of FloridaGainesvilleFL 32603USA Department of Electrical and Computer Engineering University of FloridaGainesvilleFL 32603USA Department of Materials Science&Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA CREOL The College of Optics&PhotonicsUniversity of Central FloridaOrlandoFL 32816USA

Photonic Random-Access Memories(P-RAM)are an essential component for the on-chip non-von Neumann photonic computing by eliminating optoelectronic conversion losses in data *** Phase-Change Materials(PCMs)have been showed multilevel memory capability,but demonstrations still yield relatively high optical loss and require cumbersome WRITE-ERASE approaches increasing power consumption and system package *** we demonstrate a multistate electrically programmed low-loss nonvolatile photonic memory based on a broadband transparent phase-change material(Ge2Sb2Se5,GSSe)with ultralow absorption in the amorphous state.A zero-staticpower and electrically programmed multi-bit P-RAM is demonstrated on a silicon-on-insulator platform,featuring efficient amplitude modulation up to 0.2 dB/μm and an ultralow insertion loss of total 0.12 dB for a 4-bit memory showing a 100×improved signal to loss ratio compared to other phase-change-materials based photonic *** further optimize the positioning of dual microheaters validating performance *** we demonstrate a half-a-million cyclability test showcasing the robust approach of this material and ***-loss photonic retention-of-state adds a key feature for photonic functional and programmable circuits impacting many applications including neural networks,LiDAR,and sensors for example.

关键词： retention random eliminating

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Highly efficient fiber to Si waveguide free-form coupler for foundry-scale silicon photonics

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Photonics Research 2024年第5期12卷 1055-1066页

作者： LUIGI RANNO JIA Xu BRIAN SIA cosmin popescu DREW WENINGER SAMUEL SERNA SHAOLIANG YU LIONEL C.KIMERLING ANURADHA AGARWAL TIAN GU JUEJUN HU Department of Materials Science&Engineering Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Centre for Micro-&Nano-Electronics(CMNE) Nanyang Technological UniversitySingapore 639798Singapore Department of Physics Photonics and Optical EngineeringBridgewater State UniversityBridgewaterMassachusetts 02324USA Zhejiang Laboratory Hangzhou 311100China Materials Research Laboratory Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA

As silicon photonics transitions from research to commercial deployment,packaging solutions that efficiently couple light into highly compact and functional sub-micrometer silicon waveguides are imperative but remain *** 220 nm silicon-on-insulator(SOI)platform,poised to enable large-scale integration,is the most widely adopted by foundries,resulting in established fabrication processes and extensive photonic component *** development of a highly efficient,scalable,and broadband coupling scheme for this platform is therefore of paramount *** two-photon polymerization(TPP)and a deterministic free-form micro-optics design methodology based on the Fermat’s principle,this work demonstrates an ultraefficient and broadband 3-D coupler interface between standard SMF-28 single-mode fibers and silicon waveguides on the 220 nm SOI *** coupler achieves a low coupling loss of 0.8 dB for the fundamental TE mode,along with 1 dB bandwidth exceeding 180 *** broadband operation enables diverse bandwidthdriven applications ranging from communications to ***,the 3-D free-form coupler also enables large tolerance to fiber misalignments and manufacturing variability,thereby relaxing packaging requirements toward cost reduction capitalizing on standard electronic packaging process flows.

关键词： fiber waveguide enable

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Beneficial use of mussel shell as a bioadditive for TPU green composites by the valorization of an aqueous waste

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Waste Disposal and Sustainable Energy 2024年第1期6卷 123-137页

作者： SedefŞişmanoğlu Yasin Kanbur Carmen-Mihaela popescu Diana Kindzera Ümit Tayfun Department of Chemistry Karabuk University78050KarabukTurkey Petru Poni Institute of Macromolecular Chemistry of the Romanian Academy 700487IasiRomania Department of Chemical Engineering Lviv Polytechnic National UniversityLviv79013Ukraine Department of Basic Sciences Bartin University74110BartinTurkey

Scientific studies have focused on environmentally friendly solutions as effective as the reuse of crop products owing to plastic-waste problems in recent *** issue is the main driving force for upcoming academic research attempts in waste valorization-related ***,we integrated an aqua-waste,mussel shell(MS),as a bioadditive form into green thermoplastic polyurethane(TPU)green *** of the MS surface was performed to achieve strong adhesion between composite *** surface functionalities of MS powders were evaluated via infrared spectroscopy and scanning electron microscopy(SEM)*** samples were prepared by melt-compounding followed by injection molding *** was confirmed by morphological analysis that relatively better adhesion between the phases was achieved for composites involving surface-modified MS compared to unmodified *** strength and Young’s modulus of surface-modified MS-filled composites were found to be higher than those of unmodified MS,whereas the elongation at break shifted to lower values with MS *** shore hardness of TPU was remarkably improved after being incorporated with silane-treated MS(AS-MS).Stearic acid-treated MS(ST-MS)additions resulted in an enhancement in the thermal stability of the ***-mechanical analysis showed that the storage moduli of composites were higher than those of unfilled ***-MS additions led to an increase in the characteristic glass transition temperature of *** flow index(MFI)of neat TPU was highly improved after MS loading regardless of modification *** to the wear test,surface modification of MS displayed a positive effect on the wear resistance of *** the water absorption data of the composites were evaluated,the TPU/AS-MS composite yielded the lowest water *** silane layer on MS inclusion promoted water repellency of composites due to the hydrophobicity of *** results of the biodegradation

关键词： Aqua-waste Polyurethane Mussel shell Green composites Sustainability Waste valorization

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Structure and heat capacity of the NaCeF_4 compound

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Journal of Rare Earths 2013年第9期31卷 911-915页

作者： Virgil constantin Ana-Maria popescu "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy Splaiul Independentei 202 st.060021BucharestRomania

This work continued our general research program on obtaining metallic cerium by electrodeposition from NaCeF4 dis-solved in different molten fluorides. The structure of NaCeF4 （cubic or hexagonal depending on the way of preparation） was estab-lished by DTA analysis, IR spectra and X-ray diffraction. The heat capacity （Cp） of NaCeF4 was measured by differential scanning calorimetry in the temperature range of 300-1093 K using the“step-method”. The Cp was fitted by an equation with a satisfactory re-sult. Heat capacity was compared with that calculated from the Neumann-Kopp rule （NKR） and the deviations observed were consis-tent with the stability of the NaCeF4 compound.

关键词： cerium compounds structure heat capacity NaCeF4 rare earths

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Current Efficiency, Corrosion and Structural Changes in SnO2-Sb2O3-CuO Inert Anodes for Aluminium Electrolysis

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Chinese Journal of Chemical Physics 2014年第3期27卷 368-372页

作者： Ana-Maria popescu Virgil constantin Ilie Mur&ulescu Institute of Physical Chemistry of the Romanian Academy Splaiul Independentei 202060021 Bucharest Romania

A systematic study was conducted on current efficiency （CE）, corrosion and structural changes in SnO2-based inert anodes （made of 96wt%SnO2＋2wt%Sb2O3＋2wt%CuO） on a laboratory Hall-Heroult aluminium cell. The influence of operating parameters and electrolyte composition on the CE and corrosion process were evaluated. The CE was found to be more than 90% and catastrophic corrosion took place at low percent of Al2O3, high percent of LiF, low cryolite ratio and high current densities. From all the structural changes that took place in the SnO2-based inert anodes, we assumed that the most important contribution was due to the migration of CuO towards the outer limits of the constituent grains of SnO2 based ceramic. The complex process occurred during the formation of various phases and their sintering ability both directly depended on Cu/Sb molar ratio.

关键词： Inert anode Aluminium electrowinning Current efficiency

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Synthesis, Characterization and Thermophysical Properties of Three Neoteric Solvents-Ionic Liquids Based on Choline Chloride

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Chemical Research in Chinese Universities 2014年第1期30卷 119-124页

作者： popescu Ana-Maria constantin Virgil Laboratory of Molten Salts llie Murgulescu Institute of Physical Chemistry of the Romanian Academy Bucharest 006021 Romania

The authors prepared,characterized and preliminary studied the properties of some neoteric solvents-ionic liquids based on choline chloride,i.e.,three ionic liquids based on the eutectics of choline chloride（2-hydroxyN,N,N-trimethylethanaminium chloride） with,respectively,urea,malonic acid and citric *** obtained mixtures were clear and colorless ionic liquids at room *** thermophysical properties,namely,density,viscosity,and electrical conductivity of these mixtures were investigated as a function of temperature within a range of 298-353 *** for the temperature dependence of the measured properties were generated and discussed in terms of Arrhenius *** the electrochemical windows of the eutectic liquids were determined.

关键词： Neoteric solvent Ionic liquid Choline chloride Malonic acid Citric acid Density Viscosity Conductivity

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Electrochemical studies on cerium(Ⅲ) in molten fluoride mixtures

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Journal of Rare Earths 2010年第3期28卷 428-434页

作者： VIRGIL constantin ANA-MARIA popescu MIRCEA OLTEANU Romanian Academy Institute of Physical Chemistry "Ilie Murgulescu"Department of Molten Salts Splaiul Independentei 202Bucharest-Romania

This study aims to determine the principal electrochemical characteristics of the electrodeposition of cerium metal from molten fluoride *** cathodic process of Ce3+ ions in LiF-NaF and LiF-NaF-CaF2 molten salts was studied using electrochemical techniques as steady state and cyclic voltammetry *** decomposition potential(Ed) and the overvoltage(η) were determined for NaCeF4 using current-potential curves under galvanostatic *** Ed was found to be 2.025 V in LiF-NaF and 2.045 V in...

关键词： cerium molten salts lanthanides NaCeF4 electrolysis cyclic voltammetry

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Determination of Metal Content in Soil and Wheat Plant by Inductively Coupled Plasma Mass Spectrometry

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Journal of Agricultural Chemistry and Environment 2024年第3期13卷 300-311页

作者： Iubu (Badea) Anişoara Ion V. popescu Claudia Stihi Ioana Daniela Dulama Doctoral School of Physics University of Bucharest Magurele Romania Faculty of Science and Arts Valahia University of Targoviste Targoviste Romania Academy of Romanian Scientists Bucharest Romania Institute of Multidisciplinary Research for Science and Technology Valahia University of Targoviste Targoviste Romania

This study aims to investigate the level of soil pollution and the grade of accumulation of metals and heavy metals by wheat plants from the soil in different parts of the crop: root, stem, leaf, spike and grain. Sampling campaigns took place in February, April and July when wheat plants were at different growth stages. A number of eight soil samples and eight wheat plant samples were collected. The sampled wheat plant was taken at the same time and from the same place as the soil. Concentrations of Al (aluminium), Cr (chromium), Mn (manganese), Fe (iron), Ni (nickel), Co (cobalt), Cu (copper), Zn (zinc), Sr (strontium), Cd (cadmium) and Pb (lead) were determined by inductively coupled plasma mass spectrometry. Bioconcentration and translocation factors were calculated for the samples analysed.

关键词： Soil Wheat Plant Heavy Metals Translocation Factor

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Electrochemical Study and Electrodeposition of Copper（I） in Ionic Liquid-reline

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Chemical Research in Chinese Universities 2013年第5期29卷 991-997页

作者： popescu Ana-Maria COJOCARU Anca DONATH Cristina constantin Virgil Laboratory of Molten Salts "Hie Murgulescu" Institute of Physical Chemistry of Romanian Academy Bucharest 060021 Romania Department of Applied Physical Chemistry and Electrochemistry University Politehnica of Bucharest Bucharest 010737 Romania

The authors made the electrochemical studies on the electrode processes during copper electrodeposition with ionic liquids-reline as an electrolytic medium. Reline is a commercial name for a eutectic mixture of choline chloride and urea（1：2, molar ratio）. This new proposed method of copper deposition is an ecological one because the ionic liquids are recyclable, non-volatile and non-toxic. Cyclic voltammetry investigations were conducted at 343 and 353 K in choline chloride-urea（Reline） deep eutectic solvent with single salt CuCl（generally in 0.05--0.38 mol/L concentration range）. Electrochemical impedance spectroscopy investigations were conducted in choline chloride- urea ionic liquid with CuCI（0.05 mol/L）. We investigated both cathodic and anodic processes of Cu＋ ions at different sweep rates in this new electrolytic system based on choline chloride. We have proposed by this an alternative to the classical copper electrodeposition. Coefficient of diffusion, Do, for the system Reline-CuCl is presented and the value of D0 is 1.22× 10^-8 cm2/s.

关键词： Ionic liquid Reline Electrodeposition Cu(I) Coefficient of diffusion

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Electromagnetic Characteristics and Corrosion Resistance of New Magnetosoft Materials Based on Capsulated Iron Powders

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Chemical Research in Chinese Universities 2020年第6期36卷 1326-1331页

作者： Alexander VETCHER Gennady GOVOR Olga DEMIDENKO Virgil constantin Ana Maria popescu Scientific-Practical Materials Research Centre National Academy of BelarusP.Brovki 19 Str.220072 MinskBelarus “IlieMurgulescu”Institute of Physical Chemistry of Romanian Academy Laboratory of Electrochemistry and CorrosionSplaiullndependentei 202Bucharest 060021Romania

A new method of depositing an insulating multifunctional oxide coating on metal particles was *** coatings increase corrosion resistance and insulate metal particles from each *** base of capsulated by oxide coating water-atomized iron powder ASC100.29,new composite soft magnetic materials were synthesized,which are able of replacing electrical steel in ***,electromagnetic properties and corrosion characte-ristics of the obtained composites were *** was found that the synthesized composite materials have low elec-tromagnetic losses,high values of magnetic induction(up to 2.1 T)and good corrosion *** results demon-strate that the use of such materials in power supplies,c hokes,transformers,stators and rotors of electric machines and other products ensures their stable operation under various conditions.

关键词： Soft magnetic composite material Iron powder Insulating cover High-frequency transformer Stators and rotors of electro machine

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