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Journal of Biomedical Science and Engineering 2010年第3期3卷 241-246页

作者： Nicos Mylonas Kleanthis Ioannides Venediktos Hadjisavvas dimitris iosif Panayiotis A. Kyriacou Christakis Damianou 不详

The effectiveness of magnetic resonance imaging (MRI) to monitor thermal lesions created by High Intensity Focused Ultrasound (HIFU) in rabbit liver in vivo is investigated. The MRI sequences of T1- weighted, and T2-weighted fast spin echo (FSE) were evaluated. The main goal in this paper was to find the range of repetition time (TR) and range of echo time (TE) which maximizes the contrast to noise ratio (CNR). An ultrasonic transducer operating at 2 MHz was used, which is navigated using a positioning device. With T1W FSE the range of TR under which CNR is maximized ranges from 400 to 900 ms. The maximum contrast measured is approximately 25. With T2W FSE the range of TE that establishes maximum contrast is between 40 ms and 80 ms, with CNR of approximately 14. T1W FSE is much better than T2W FSE in detecting thermal lesions in liver. Both T1W and T2 W FSE were proven successful to image thermal lesions created by HIFU in rabbit liver in vivo.

关键词： Ultrasound Liver MRI Lesion Ablation

New results on Cll and C12 lattices with applications to Grothendieck categories and torsion theories

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Frontiers of Mathematics in China 2016年第4期11卷 815-828页

作者： Toma ALBU Mihai iosif Simion Stoilow Institute of Mathematics of the Romanian Academy Research Unit 5 P.O. Box 1-764 RO-010145 Bucharest 1 Romania Bucharest University Department of Mathematics Academiei Str. 14RO-010014 Bucharest 1 Romania

In this paper, which is a continuation of our previous paper [T. Albu, M. iosif, A. Tercan, The conditions （Ci） in modular lattices, and applications, J. Algebra Appl. 15 （2016）, http： ***/10.1142/S0219498816500018], we investigate the latticial counterparts of some results about modules satisfying the conditions （Cll） or （C12）. Applications are given to Grothendieck categories and module categories equipped with hereditary torsion theories.

关键词： Modular complement lattice C12 theory element lattice upper closed element lattice Goldie dimension continuous lattice essential element uniform lattice condition (Ci) Cll socle Grothendieck category torsion

Perovskite type lanthanum manganite：Morpho-structural analysis and electrical investigations

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Journal of Rare Earths 2018年第5期36卷 499-504页

作者： Paula Sfirloaga Maria Poienar iosif Malaescu Antoanetta Lungu Paulina Vlazan Institute for Research and Development in Electrochemistry and Condensed Matter P. Andronescu Street No.1 300224 Timisoara Romania West University of Timisoara Vasile Parvan 4 300223 Romania

Perovskite-type oxides of LaMnO3 were synthesized by means of the sol-gel method, in the presence of citric acid as gelling agent. The precursors used were Mn（NO3）2·H2O, La2O3, and NaOH,mixed in the stoichiometric ratio to obtain perovskite materials. The obtained gel was heat-treated at 400, 600 and 800 ℃ respectively, for 6 h. X-ray diffraction and FT-IR spectroscopy were used to analyze the phase transformation as a function of temperature, and the Rietveld refinement was used in order to characterize the materials obtained structurally. The average crystallite size of the products was calculated from XRD data and the average particle size was measured from the TEM micrographs. At 600 ℃, the synthesized compound is well-crystallized, showcases a perovskite structure（Pm-3m space group）, and exhibits uniform and homogeneous hexagonally-shaped particles, with sizes in the 20-50 nm *** impedance measurements in the 20-2 × 10^6 Hz frequency range were carried out at different temperatures（26-115 ℃）, and the electrical conduction mechanism is discussed.

关键词： Rare earths Sol-gel method Physico-chemical properties Electrical investigations

The“Bitcoin Generator”Scam

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Blockchain(Research and Applications) 2022年第3期3卷 70-88页

作者： Emad Badawi Guy-Vincent Jourdan iosif-Viorel Onut Faculty of Engineering University of OttawaOttawaON K1N 6N5Canada IBM Centre for Advanced Studies OttawaON K1R 7Y6Canada

The“Bitcoin Generator Scam”(BGS)is a cyberattack in which scammers promise to provide victims with free cryptocurrencies in exchange for a small mining *** this paper,we present a data-driven system to detect,track,and analyze the *** works as follows:we first formulate search queries related to BGS and use search engines to find potential instances of the *** then use a crawler to access these pages and a classifier to differentiate actual scam instances from benign ***,we automatically monitor the BGS instances to extract the cryptocurrency addresses used in the scam.A unique feature of our system is that it proactively searches for and detects the scam ***,we can find addresses that have not yet received any *** data collection project spanned 16 months,from November 2019 to February *** uncovered more than 8,000 cryptocurrency addresses directly associated with the scam,hosted on over 1,000 ***,these addresses have received around 8.7 million USD,with an average of 49.24 USD per *** 70%of the active addresses that we are capturing are detected before they receive any transactions,that is,before anyone is *** also present some post-processing analysis of the dataset that we have captured to aggregate attacks that can be reasonably confidently linked to the same attacker or *** system is one of the first academic feeds to the APWG eCrime Exchange *** has been actively and automatically feeding the database since November 2020.

关键词： Cryptocurrency Scam analysis Cyberattack Fraud detection Bitcoin Blockchain analysis Data mining

Composite Biomaterials Based on Poly(L-Lactic Acid)and Functionalized Cellulose Nanocrystals

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Journal of Renewable Materials 2020年第4期8卷 383-395页

作者： Mariia Stepanova Ilia Averianov Olga Solomakha Natalia Zabolotnykh iosif Gofman Mikhail Serdobintsev Tatiana Vinogradova Viktor Korzhikov-Vlakh Evgenia Korzhikova-Vlakh Institute of Macromolecular Compounds Russian Academy of SciencesSt.Petersburg199004Russia St.Petersburg Research Institute of Phthisiopulmonology St.Petersburg194064Russia Institute of Chemistry Saint-Petersburg State UniversitySt.Petersburg199034Russia

The biocomposite films were prepared from poly(L-lactic acid)and cellulose *** improve interfacial compatibility of hydrophilic cellulose nanocrystals with hydrophobic matrix polymer as well as to provide the osteoconductive properties,cellulose was functionalized with poly(glutamic acid).The modified cellulose nanocrystals were better distributed and less aggregated within the matrix,which was testified by scanning electron,optical and polarized light *** to mechanical tests,composites filled with nanocrystals modified with PGlu demonstrated higher values of Young’s modulus,elongation at break and tensile *** of composite materials in model buffer solutions for 30 weeks followed with staining of Ca^(2+)deposits with Alizarin Red S assay testified better mineralization of materials containing PGlu-modified cellulose nanocrystals as *** the result of in vivo experiment,the developed composite materials showed less level of inflammation in comparison with pure polymer matrix and composites filled with non-functionalized cellulose nanocrystals.

关键词： Biomaterials polymer composites biodegradable and biocompatible polymers poly(L-lactic acid) cellulose nanocrystals modification

Monetary Policy and Unemployment:The Case of Romania

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Chinese Business Review 2022年第2期21卷 41-50页

作者： Anaida iosif The Bucharest University of Economic Studies BucharestRomania

The paper aims to analyze the monetary transmission model between the monetary policy and the labor market variable of *** results of the data show that,the external shocks have an important impact especially on the Romanian interest rates but also on the domestic production;however,the impact is not significant on unemployment,which proves the resilience of the domestic labor *** central bank policy rate has a stabilizing effect on the unemployment rate in case of an increase in the euro area policy rate.

关键词： structural vector autoregression(SVAR) monetary policy labor force unemployment rate

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前四个矩之间的关系

数学译林 2022年第3期41卷 284-285,234页

作者： iosif Pinelis 陆柱家(译) 童欣(校) 不详

用一个随机变量的第1,2,4个矩来给出其第3个矩的最好可能的界.

关键词：随机变量 1,2 之间的关系

Is there a role for colon capsule endoscopy beyond colorectal cancer screening? A literature review

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World Journal of Gastroenterology 2014年第36期20卷 13006-13014页

作者： Konstantinos Triantafyllou iosif Beintaris George D Dimitriadis Hepatogastroenterology Unit Second Department of Internal Medicine and Research Institute Attikon University General Hospital Medical School Athens University 12462 Haidari Greece

Colon capsule endoscopy is recommended in Europe alternatively to colonoscopy for colorectal cancer screening in average risk individuals. The procedure has also been proposed to complete colon examination in cases of incomplete colonoscopy or when colonoscopy is contraindicated or refused by the patient. As tissue samples cannot be obtained with the current capsule device, colon capsule endoscopy has no place in diagnosing ulcerative colitis or in dysplasia surveillance. Nevertheless, data are accumulating regarding its feasibility to examine ulcerative colitis disease extent and to monitor disease activity and mucosal healing, even though reported results on the capsule's performance in this field vary greatly. In this review we present the currently available evidence for the use of colon capsule endoscopy to complement colonoscopy failure to reach the cecum and its use to evaluate ulcerative colitis disease activity and extent. Moreover, we provide an outlook on issues requiring further investigation before the capsule becomes a mainstream alternative to colonoscopy in such cases.

关键词： Colon Capsule endoscopy Incomplete colonoscopy Ulc

Comparative Study on the Surface Dose of Some Bolus Materials

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2015年第4期4卷 348-352页

作者： iosif Malaescu Catalin Nicolae Marin Marius Spunei Department of Physics West University of Timisoara Timisoara Romania High Energy Radiotherapy Center Timisoara Romania

In order to investigate the possibility of using different materials as bolus in radiotherapy, five samples denoted by S2 - S6 were prepared and analyzed by comparison with one available commercial bolus denoted by S1. Sample S1 was a thermoplastic material from Qfix;S2 was a moldable silicon rubber (RTV-530 from Prochima);S3 and S4 were obtained by adding micrometric particles of Al and Cu respectively (at the same mass concentration of 5.5%);S5 was another moldable silicon rubber (GSP400 from Prochima) and S6 was a mixture of GSP400 and micrometric particles of Cu (at the mass concentration of 5.5%). The measurements of normalized transmitted dose as a function of sample thickness were performed for all samples (S1 - S6) at two values of electron beam energy (6 and 9 MeV) produced by a linear accelerator VARIAN 2100SC. The results showed that the maximum of the normalized transmitted dose of manufactured samples (S2 - S6) is registered at smaller sample thicknesses than for the analyzed commercial bolus (sample S1). The smallest sample thickness corresponding to normalized maximum point dose is obtained for sample S2 (RTV-530). Measurements performed for electron beam energy of 6 and 9 MeV have proven the possibility of using the manufactured samples as bolus in radiotherapy.

关键词： Bolus Materials Surface Dose Build-Up Region Moldable Silicon Rubber Electron Beams

Role of probiotics,prebiotics and synbiotics in chemoprevention for colorectal cancer

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World Journal of Gastroenterology 2008年第42期14卷 6453-6457页

作者： Constantine iosif Fotiadis Christos Nikolaou Stoidis Basileios Georgiou Spyropoulos Eleftherios Dimitriou Zografos 3rd Surgical Clinic of the university hospital 'ATTIKON' Athens Greece

Colorectal cancer is the third most common form of *** treatments are all associated with a high risk of complications and a low success ***,synbiotics have been proposed as a new preventive and therapeutic *** is no direct experimental evidence for cancer suppression in humans as a result of the consumption of pro-,pre-or ***,there is a wealth of evidence emerging from laboratory *** mechanisms by which pro-,pre-and synbiotics may inhibit colon cancer are now beginning to be understood and will be addressed in the present review.

关键词：生命起源前生命期结肠直肠癌治疗方法