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Hard carbon derived from coconut shells,walnut shells,and corn silk biomass waste exhibiting high capacity for Na-ion batteries

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Journal of Energy Chemistry 2021年第7期30卷 207-218页

作者： Cristina Nita Biao Zhang Joseph Dentzer camélia matei ghimbeu Universitéde Haute-Alsace Institut de Science des Matériaux de Mulhouse(IS2M)CNRS UMR 7361F-68100 MulhouseFrance Universitéde Strasbourg F-67081 StrasbourgFrance Center for Advanced Laser Technologies(CETAL) National Institute for LasersPlasma and Radiation PhysicsAtomistilor 409 bisRO-77125 MagureleRomania Department of Applied Physics The Hong Kong Polytechnic UniversityKowloonHong KongChina Réseau sur le Stockage Electrochimique de l’Energie(RS2E) CNRS FR345933 Rue Saint Leu80039 Amiens CedexFrance

In recent years,hard carbon materials have gained significant interest as anode materials for Na-ion *** waste is considered one of the most interesting,renewable,available,and cost-effective precursor to obtain hard carbon(HC);however,HC properties must be finely tuned to achieve performance comparable to those provided by Li-ion *** this work,three biomass wastes(coconut shells,walnut shells,and corn silk) were evaluated as potential precursors for HC preparation involving a pyrolysis process and subsequent acid washing to remove the inorganic *** obtained materials exhibited low and similar specific surface areas(<10 m^(2)·g^(-1)), but they presented different structures and surface *** walnut shell HC possessed a lower amount of inorganic impurities and oxygen-based functional groups compared to the coconut shell and corn silk HCs,leading to higher initial coulombic efficiency(iCE).The structural organization was higher in the case of the walnut shell HC,while the corn silk HC revealed a heterogeneous structure combining both highly disordered carbon and localized graphitized *** HCs delivered high initial reversible capacities between 293 and 315 mAh g^(-1) at 50 mA g^(-1) current rate,which remained rather stable during long-term *** best capacity(293 mAh g^(-1) after 100 charge/discharge cycles) and highest capacity retention(93%) was achieved in walnut HCs in half-cells,which could be associated with its higher sp2 C content,better organized structure,and fewer *** "adsorption-insertion" Na storage mechanism is suggested based on several *** walnut HCs exhibited an attractive energy density of 279 Wh/kg when tested in full cells.

关键词： Biomass Pyrolysis Hard carbon Anode Na-ion batteries Energy storage

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Carbon–Iron Microfibrous Material Produced by Thermal Treatment of Self-rolled Poly(4-vinyl pyridine) Films Loaded by Fe_2O_3 Particles

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Journal of Materials Science & Technology 2015年第9期31卷 881-887页

作者： camelia matei ghimbeu Aleksandr I.Egunov Andrey S.Ryzhikov Valeriy A.Luchnikov Institut de Science des Matériaux de Mulhouse

Ensembles of freeze-dried self-rolled polymer micro-scrolls are explored as template media for produc- ing carbon-iron based composites with fibrous morphology. Polymer fibres impregnated with furfuryl alcohol and loaded with Fe2O3 particles, were thermally treated under inert atmosphere at 700 ℃ and subsequently analysed by scanning and transmission electron microscopy, X-ray diffraction, thermogravimetric analysis, and nitrogen adsorption. The resulting material has a micro-fibrous mor- phology and is basically composed of metallic Fe^0 and FeO particles, i.e., more than 98 wt% of the carbon/ iron-based composite mass. These particles are held together by amorphous porous carbon foam obtained by in-situ carbonization of the polymer/Fe2O3 composite with evacuation of carbon from the system via COx gases released by carbo-reduction of Fe2O3. The material has significant activity in the reaction of catalytic decomposition of hydrogen peroxide in water solutions.

关键词： Composite materialsPorous carbonPolymersIron particles

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Operator Equations and Duality Mappings in Sobolev Spaces with Variable Exponents

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Chinese Annals of Mathematics,Series B 2013年第5期34卷 639-666页

作者： Philippe G.CIARLET George DINCA Pavel matei Department of Mathematics City University of Hong Kong83 Tat Chee AvenueKowloonHong KongChina Faculty of Mathematics and Computer Science University of Bucharest14 Academiei Street010014 BucharestRomania. Technical University of Civil Engineering Department of Mathematics and Computer Science124 Lacul Tei Blvd.020396 BucharestRomania.

After studying in a previous work the smoothness of the space where dr- measF0 〉 O, with p（.） E C（~） and p（x）〉 1 for all x E , the authors study in this paper the strict and uniform convexity as well as some special properties of duality mappings defined on the same space. The results obtained in this direction are used for proving existence results for operator equations having the form Ju = Niu, where J is a duality mapping on Uro corresponding to the gauge function ~, and Nf is the Nemytskij operator generated by a Caratheodory function f satisfying an appropriate growth condition ensuring that Nf may be viewed as acting from Ur0 into its dual.

关键词： Monotone operators Smoothness Strict convexity Uniform convexity Duality mappings Sobolev spaces with a variable exponent Nemytskijoperators

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Bleeding Dieulafoy's-like lesions of the gut identified by capsule endoscopy

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World Journal of Gastroenterology 2013年第29期19卷 4823-4826页

作者： Lidia Ciobanu Oliviu Pascu Brindusa Diaconu Daniela matei Cristina Pojoga Marcel Tantu Regional Institute of Gastroenterology and Hepatology University of Medicine and Pharmacy 400162 Cluj Romania

Dieulafoy's-like lesions (DLs-like) represent a cause of obscure gastrointestinal bleeding, enteroscopy being the main diagnostic and therapeutic procedure. Frequently, more than one enteroscopy is needed to identify the bleeding vessel. In our practice, video capsule endoscopy (VCE) identified and guided therapy in four cases of DLs-like; three of them were localized on the small bowel. We report, for the first time, a diagnosis of colonic DL-like performed by colon capsule endoscopy. Two patients presented with severe cardiovascular disorders, being hemodynamically unstable during VCE examination. Based on the VCE findings, only one invasive therapeutic procedure per patient was necessary to achieve hemostasis. VCE and enteroscopy may be regarded as complementary procedures in patients with gut DLs-like.

关键词： Obscure gastrointestinal bleeding Dieulafoy’ s-like lesion Video capsule endoscopy Enteroscopy Small bowel

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Gazing through the bubble:an experimental investigation into financial risk‑taking using eye‑tracking

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Financial Innovation 2023年第1期9卷 750-776页

作者： Filip‑Mihai Toma Cosmin‑Octavian Cepoi matei Nicolae Kubinschi Makoto Miyakoshi NEXARCH Lab BucharestRomania California Institute of Technology 1200 E California BlvdPasadenaCA 91125USA Bucharest University of Economic Studies Mihail Moxa RoadNo.11010964 BucharestRomania CEFIMO–Center of Financial and Monetary Research The Bucharest University of Economic StudiesBucharestRomania Swartz Center for Computational Neuroscience Institute for Neural ComputationUniversity of California San Diego9500 Gilman DriveLa JollaCA 92093‑0559USA

Eye tracking can facilitate understanding irrational decision-making in contexts such as financial *** this purpose,we develop an experimental framework in which participants trade a risky asset in a simulated bubble market to maximize individual returns while their eye movements are *** are sensitive to eye movement dynamics,depending on the presented visual *** eye-tracking data,we investigated the effects of arousal,attention,and disengagement on individual payoffs using linear and nonlinear *** estimating a nonlinear model using attention as a threshold variable,our results suggest that arousal positively influences trading returns,but its effect becomes smaller when attention exceeds a certain threshold,whereas disengagement has a higher negative impact on reduced attention levels and becomes almost irrelevant when attention ***,we provide a neurobehavioral metric as a function of attention that predicts financial gains in boomand-bust *** study serves as a proof-of-concept for developing future psychometric measures to enhance decision-making.

关键词： Financial bubble Experiment Risk-taking Eye-tracking Attention Arousal

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Comparison of the use of Alvarado and AIR scores as an adjunct to the clinical diagnosis of acute appendicitis in the pediatric population

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World Journal of Pediatric Surgery 2019年第2期2卷 33-37页

作者： Aya Musbahi Darren Rudd matei Dordea Bussa Gopinath Vijay Kurup University Hospital of North Tees Stockton-on-TeesUK

Background Acute appendicitis is one of the most common causes of acute abdominal pain with an incidence of 1.17 per 1000 and lifetime risk of approximately 7%.It remains the most common indication for emergency abdominal surgery in *** of acute appendicitis is particularly difficult in young women and the pediatric *** the USA,CT imaging is used to avert diagnostic dilemma,however the procedure is associated with radiation risk in this vulnerable ***,the procedure has high cost and variable *** A retrospective study involving all suspected pediatric cases of appendicitis between the ages of 5 and 17 who were operated on between 2012 and 2015 was carried *** were collated from clinical notes on age,sex,ultrasound findings;postoperative complications,white cell count,neutrophils,C-reactive protein,histology result,and number of days to *** patients in the time period were retrospectively scored on the Alvarado and Appendicitis Inflammatory Response(AIR)*** A total of 239 patients between 11 and 17(mean 13.6±SE)years of age were included in the *** these,79 had preoperative ultrasound,of which 52 were negative,and only one patient had CT scan.213 of the patients had an appendicectomy and 26 had diagnostic laparoscopy with no *** the 213 appendixes removed,71 were histopathologically normal,giving a negative appendectomy rate of 33.3%.28 appendixes were *** average number of days from admission to theater was 1.0 SE in males and 1.424 in females(p=0.0498).The average number of days from admission to theater in those who had ultrasound was 2.03 days compared with 0.75 in those who did not have ultrasound(p<0.0001).AIR scoring that was high and medium risk showed slightly lower negative appendicectomy rates but not significantly *** Our study has found no significant difference between the AIR scores and *** is a role for scori

关键词： pediatric diagnosis removed

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Developments in the Romanian Real Estate： Where to？

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Journal of Modern Accounting and Auditing 2011年第5期7卷 533-539页

作者： Madalina matei Nitoiu The Academy of Economic Studies Romania

The financial crisis has deeply affected Eastern European countries since the end of 2008. The global economic crisis put an end to a period when the region witnessed solid economic growth, high inflows of foreign investment and a dynamic real estate sector, which was one of the main drivers of the region＇s economic growth （Abelson, Kaemar, ＆ Jackofsky, 1990）. The Eastern European real estate market was deeply impacted by the crisis. Investment in real estate dropped sharply due to the significant increase in risks and difficulties in financial borrowing （Bruce, 1991）. Rising unemployment affected retail sales, as well as office net absorption. Take-up fell significantly in all markets： Transactions were of smaller size and demand for buildings decreased. On the supply side, vacancy increased sharply due to the high level of completions entering the market （Smith, 1992）. The strong rise in vacancy rates has put pressure on rents, which dropped sharply in 2008 and in early 2009. They started to stabilize only by the end of 2009. How will the Romanian real estate market evolve？ No one knows for certain. Through this work we try to get some predictions based on statistical theory and not on the lessons learned from other crises.

关键词： real estate financial crisis Eastern European countries

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New therapeutic options opened by the molecular classification of gastric cancer

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World Journal of Gastroenterology 2018年第18期24卷 1942-1961页

作者： Mihaela Chivu-Economescu Lilia matei Laura G Necula Denisa L Dragu Coralia Bleotu Carmen C Diaconu Department of Cellular and Molecular Pathology Stefan S. Nicolau Institute of Virology Nicolae Cajal Institute Titu Maiorescu University

Gastric cancer(GC) is one of the most lethal and aggressive cancers, being the third cause of cancer related death worldwide. Even with radical gastrectomy and the latest generation of molecular chemotherapeutics, the numbers of recurrence and mortality remains high. This is due to its biological heterogeneity based on the interaction between multiple factors, from genomic to environmental factors, diet or infections with various pathogens. Therefore, understanding the molecular characteristics at a genomic level is critical to develop new treatment strategies. Recent advances in GC molecular classification provide the unique opportunity to improve GC therapy by exploiting the biomarkers and developing novel targeted therapy specific to each subtype. This article highlights the molecular characteristics of each subtype of gastric cancer that could be considered in shaping a therapeutic decision, and also presents the completed and ongoing clinical trials addressed to those targets. The implementation of the novel molecular classification system will allow a preliminary patient selection for clinical trials, a mandatory issue if it is desired to test the efficacy of a certain inhibitor to the given target. This will represent a substantial advance as well as a powerful tool for targeted therapy. Nevertheless, translating the scientific results into new personalized treatment opportunities is needed in order to improve clinical care, the survival and quality of life of patients with GC.

关键词： Gastric cancer Molecular classification Immunotherapy Targeted therapy Clinical trials

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Short-term effects of cleaning-respacing in a silver fir-dominated stand in Romania

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Journal of Forestry Research 2018年第6期29卷 1591-1599页

作者： Valeriu-Norocel Nicolescu Cornelia Hernea Diana-Cristina Simon3 matei-Nicolae Ciolan Monica-Elena Barti Hendrik Schubert Edina Borbely Faculty of Silviculture and Forest Engineering Transylvania University of Brasov.irul Beethoven 1500123 BrasovRomania Faculty of Horticulture and Forestry Banat’s University of Agricultural Sciences and Veterinary Medicine“King Michael I of Romania”from Timi.oaraCalea Aradului 119300645 Timi.oaraRomania Barzava Forest District 317030 BarzavaAradRomania LIGNUM Forest District 605300 DarmanestiBacauRomania

This paper discusses the early silviculture of silver fir(Abies alba Mill.), a major softwood in Romania covering more than 294,000 ha. Three research plots(DRP1, DRP2 and DRP3) were established in a 25-year-old silver fir-dominated stand in May 2012. In DRP1 and DRP2, heavy cleaning-respacing were carried out while DRP3 was kept as a control. After the treatments in 2012,the plots had stocking between 1470 trees ha-1(DRP2) and10,030 trees ha-1(DRP3), basal areas between11.8 m2ha-1(DRP2) and 31.6 m2ha-1(DRP3). The average diameters were between 5.7 cm(DRP3) and 9.6 cm(DRP2). Measurements in September 2016 confirmed the rapid response of silver fir to *** best results in average diameter increments and basal area between 2012 and 2016 were in DRP2: 3.7 cm(36.4%) and 7.7 m2ha-1(85.0%) respectively. The largest diameter trees in 2012 were the best growers, and a strong linear correlation between the initial diameter of the remaining trees and their increment was established. Natural dieback of trees occurred only in DRP3(8.6%). The selection of crop trees based on the vigour, quality, and spacing criteria during cleaning-respacing was possible as individuals stood out in terms of vigour and early diameter growth. An issue encountered in DRP1 and DRP2 was the occurrence of epicormic shoots, especially on less vigorous individuals with small crowns. However, four years after cleaning-respacing, these branches are small and do not significantly affect the wood quality.

关键词： Abies alba Tending operations Stocking Basal area Increment

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Specific Elements of the Public Internal Control in Countries of the European Union

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Chinese Business Review 2016年第8期15卷 400-406页

作者： Ani matei Gaita camelia National School of Political Science and Public Administration Bucharest Romania

The concern for greater efficiency in the public sector has determined the application in countries of the European Union of the public internal control systems, stemm from the desire of management of national funds in economic conditions. This paper addresses such issues relating to highlighting elements reflecting the importance of the control function in the management process; and identifying the characteristics of the elements constituting the control systems in countries belonging to the European Union, which were grouped into two categories depending on the date of accession to the union, using public internal control related data provided by the European Commission. Particular attention is given to highlight the characteristics of the control system applied in Romania compared to other states. Research has revealed a greater number of similarities in the characteristics of the control systems of internal public in countries that joined the Union after 1990, compared with those who became members before this year, concerning the financing of the sector public, the accounting system applied, the coordination of such a system, who bears responsibility for financial management, or the limits of managerial responsibility.

关键词： control-evaluation as a function of management characteristics of the public internal control management of public resources

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