检索结果-南通市图书馆

Inverse Electromagnetic Scattering by a Penetrable chiral Object

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2024年第9期12卷 3081-3098页

作者： Sotiria Dimitroula Paraskevi Roupa Spyridon c. Athanasiadis georgios Halikias Department of Mathematics National and Kapodistrian University of Athens Athens Greece Department of Informatics and Telecommunications National and Kapodistrian University of Athens Athens Greece School of Electrical and computer Engineering National and Technical University of Athens Athens Greece

We consider the inverse electromagnetic scattering problem of determining the shape of a perfectly conducting core inside a penetrable chiral body. We prove the well-posedness of the corresponding direct scattering problem by the variational method. We focus on a uniqueness result for the inverse scattering problem that is under what conditions an obstacle can be identified by the knowledge of the electric far-field pattern corresponding to all time-harmonic incident planes waves with a fixed wave number. To this end, we establish a chiral mixed reciprocity relation that connects the electric far-field pattern of a spherical wave with the scattered field of a plane wave.

关键词： chiral Media Inverse Scattering Problem chiral Mixed Reciprocity Relation

Totally laparoscopic left hepatectomy using the Torsional Ultrasonic Scalpel

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第35期19卷 5929-5932页

作者： georgios c.sotiropoulos Paraskevas Stamopoulos Petros charalampoudis Ernesto P Molmenti Athanasios Voutsarakis Gregory Kouraklis 2nd Department of Propedeutic Surgery University of AthensMedical School Department of Surgery North Shore University Hospital

Minimal invasive techniques have allowed for major surgical *** report our initial experience of performing total laparoscopic left hepatectomy(segmentsⅡ-Ⅳ)with the Lotus(laparoscopic operation by torsional ultrasound)Ultrasonic *** perioperative and postoperative courses of the young female patient were uneventful and she is in a good general condition without complaints 18 mo after *** the best of our knowledge,this is the first total laparoscopic hemihepatectomy to be performed in Greece,as well as the first laparoscopic liver resection using Lotus shears.

关键词： Laparoscopic surgery Liver resectionMinimally invasive surgery Hepatectomy Bloodless surgery Ultrasonic Scalpel Ultrasonic dissector Parenchyma transection Liver adenoma Focal nodular hyperplasia

Effect of growth hormone on colonic anastomosis after intraperitoneal administration of 5-fluorouracil, bleomycin and cisplatin: An experimental study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastrointestinal Surgery 2024年第8期16卷 2679-2688页

作者： Ioannis Lambrou Ioannis Mantzoros Orestis Ioannidis Dimitrios Tatsis Elissavet Anestiadou Vasiliki Bisbinas Manousos-georgios Pramateftakis Efstathios Kotidis Barbara Driagka Ourania Kerasidou Savvas Symeonidis Stefanos Bitsianis Freideriki Sifaki Konstantinos Angelopoulos Haralabos Demetriades Stamatios Angelopoulos Fourth Department of Surgery Medical SchoolAristotle University of ThessalonikiThessaloniki 57010Greece Department of ENT Royal Cornwall Hospitals NHS TrustCornwall TR13LJUnited Kingdom

BAcKGROUND Growth hormone(GH)plays a crucial role in wound healing and tissue repair in postoperative *** particular,colonic anastomosis healing following colorectal surgery is impaired by numerous chemotherapy *** To investigate whether GH can improve the healing of a colonic anastomosis following the adverse effects of intraperitoneal administration of 5-fluorouracil(5-FU),bleomycin and *** Eighty Wistar rats underwent laparotomy and a 1 cm-resection of the transverse colon,followed by an end-to-end anastomosis under general *** rats were blindly allocated into four equal groups and administered a different daily intraperitoneal therapeutic regimen for 6 *** control group(A)received normal *** B received chemotherapy with 5-FU(20 mg/kg),bleomycin(4 mg/kg)and cisplatin(0.7 mg/kg).Group c received GH(2 mg/kg),and group D received the aforementioned combination chemotherapy and GH,as *** rats were sacrificed on the 7th postoperative day and the anastomoses were macroscopically and microscop-ically *** weight,bursting pressure,hydroxyproline levels and inflammation markers were *** All rats survived until the day of sacrifice,with no infections or other complications.A decrease in the body weight of group D rats was observed,not statistically significant compared to group A(P=1),but significantly different to groups c(P=0.001)and B(Pc dehiscence rate was not statistically different between the *** pressure was not significantly different between groups A and D(P=1.0),whereas group B had a significantly lower bursting pressure compared to group D(Pcantly more adhesions than group ***,as a measurement of collagen deposition,was significantly higher in group D compared to group B(Pcally significant,compared to group *** changes in group D were recorded,compared to group A

关键词： Growth hormone colonic anastomosis Adhesion Bursting pressure collagen Hydroxyproline Inflammation Neoangiogenesis chemotherapy

Energy storage and harvesting in BaTiO_(3)/epoxy nanodielectrics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

High Voltage 2016年第4期1卷 151-157页

作者： Georgia c.Manika georgios c.Psarras Department of Materials Science University of Patras26504PatrasGreece

composite nanodielectrics consisted of an epoxy resin and barium titanate nanoparticles were developed and *** measurements were performed via broadband dielectric *** results reveal the presence of three relaxation processes,which are attributed to(a)glass to rubber transition of the polymer matrix(α-mode),(b)re-arrangement of polar side groups(β-mode)and(c)interfacial polarisation between system’s *** ability of the examined nanodielectrics to store and harvest energy was also examined in dc *** dc voltage varied in the range of 10–240 *** data indicate that increasing the applied dc field results to higher values of the stored and harvested *** energy efficiency was also investigated in all *** filler content enhances the coefficient of energy efficiency(neff)up to 58.2%for the 7 phr BaTiO_(3)nanocomposite at 200 V and 10 s charging/discharging time.

关键词： spectroscopy. rubber arrangement

Are acute exacerbations of chronic inflammatory appendicitis triggered by coprostasis and/or coproliths?

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第20期14卷 3179-3182页

作者： George Sgourakis georgios c.sotiropoulos Ernesto P Molmenti charis Eibl Stylianous Bonticous Jurgen Moege christoph Berchtold Department of General Visceral and Transplantation Surgery Department of General Surgery Marien Hospital Bottrop Institute of Pathology Marien Hospital Bottrop

AIM: To examine the role of coprostasis and coproliths in recurrent appendicitis. METHODS: We evaluated four hundred and twenty seven consecutive pathology reports of all appende- ctomy specimens from January 2003 to December 2004. Findings were categorised as showing acute appen- dicitis, acute recurrent appendicitis, subacute recurrent appendicitis, chronic appendicitis, or appendices without inflammation. All patients had presented with acute right lower quadrant pain. In 94 instances, there was a history of recurrent similar episodes in the past. RESULTS: Of the 427 histology reports, 294 were inter- preted as showing acute appendicitis, 56 acute recurrent appendicitis, 34 subacute recurrent appen-dicitis, 28 chronic appendicitis, and 15 non-inflamed appendices. coprostasis was observed in 58 patients (13.58%) and the presence of coprolith in 6 (1.4%). coprostasis, and age, were among the predictors in the final model. cONcLUSION: coprostasis but not coproliths seems to be a contributing factor to acute exacerbations of chronic inflammatory appendicitis.

关键词： chronic inflammatory appendicitis coprostasis coproliths Recurrent appendicitis

Hepatocellular carcinoma and metabolic syndrome: The times are changing and so should we

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2019年第29期25卷 3842-3848页

作者： georgios Tsoulfas Department of Surgery Aristotle University of Thessaloniki

Although hepatocellular carcinoma (Hcc) is as prevalent as ever as a cancerrelated mortality, and some would even argue that it is increasing, the pattern of its etiologies has been changing. Specifically, the domination of viral hepatitis c virus is being overcome, partly because of the emergence of the antiviral treatments, and partly because of the significant increase, especially in developed countries, of the combination of obesity, diabetes, metabolic syndrome, nonalcoholic fatty liver disease and non-alcoholic steatohepatitis. This editorial will explore the interconnection of this group of diseases and how they are linked to Hcc. More importantly, it will argue that this shift in Hcc etiology essentially means that we have to change how we approach the treatment of Hcc, by changing our focus (and resources) to earlier stages of the disease development in order to prevent the appearance and progression of Hcc.

关键词： Hepatocellular carcinoma Diabetes Obesity Steatosis Non-alcoholic fatty liver disease Body-mass index Non-alcoholic steatohepatitis

Anion effect on Li/Na/K hybrid electrolytes for Graphite//NcA(LiNi_(0.8)co_(0.15)Al_(0.05)O_(2))Li-ion batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy chemistry 2022年第1期31卷 451-462,I0012页

作者： Aiman Jrondi georgios Nikiforidis Meriem Anouti Laboratoire PcM2E Universite de ToursFaculte des sciences et technologiePare de Grandmont37200 ToursFrance LE STUDIUM Institute for Advanced Studies 45000 OrleansFrance

The electrolyte is an essential component of a battery system since it is responsible for the conduction of ions between the *** the quest for cheaper alternatives to common organic electrolytes for lithium-ion batteries(LIB),we formulated hybrid electrolytes comprising a mixture of Na,K,and Li alkaline salts with ethylene carbonate(Ec),ethyl methyl carbonate(EMc),and lithium hexafluorophosphate(LiPF_(6)),giving a total salt concentration of 1.5 M;we determined their physicochemical properties and investigated their electrochemical behavior on a nickel cobalt aluminum oxide(NcA)cathode and graphite(Gr)*** electrolytes demonstrated a melting transition peak(T_(m)).eutectic behavior,and ionic conductivities(-13 mS cm^(-1))close to those of a commercial LIB electrolyte(SE,Ec/EMc+1 M LiPF_(6))and activation energies of ca.3 kJ mol^(-1).The half-cell coin cells revealed high coulombic efficiency(99%),specific capacity(175 mAh g^(-1) at c/10),and capacity retention(92% for NacF_(3)SO_(3))for the NcA cathode and a moderate performance(coulombic efficiency of 98%for 20 cycles)on the graphite anode after the formation of the SEI *** hybrid electrolytes were cycled at 25℃ in a Gr//NcA cell yielding specific capacities of ca.225 mAh g^(-1) at a c/5 rate,corroborating that the anion plays a key role and highlighting their potential for energy storage applications.

关键词： Hybrid electrolyte Alkali salts NcA//Li cell Li-ion battery

An integrated multi-criteria analysis for assessing sustainability of agricultural production at regional level

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2020年第2期7卷 223-232页

作者： georgios Bartzas Kostas Komnitsas School of Mining and Metallurgical Engineering National Technical University of AthensZografos CampusAthens 15780Greece School of Mineral Resources Engineering Technical University of CreteChaniaCrete 73100Greece

Assessment of agricultural production sustainability is a multi-dimensional task that involves the quantification of various economic,social and environmental indicators at different scales and uncertainty *** this context,a particularly challenging approach is proposed involving the appropriate selection of the most representative criteria that ensure economic viability,eco-friendliness and social development,in order to overcome the limitations of other methodological approaches that are often vague and *** this study,a holistic methodology that integrates life cycle analysis(LcA),environmental risk assessment(ERA)along with on-site farm and regional surveys using the multi-criteria environment of the Analytical Hierarchy Process(AHP)is designed for the identification of the most sustainable agricultural management practices at regional *** on a set of 13 representative sub-criteria,the proposed approach was applied to Pistacia vera *** in Aegina island,Greece,where narrow range of resources is available,groundwater supply is scarce and of poor ***,three alternative scenarios,*** scenario representing the current production(BL)as well as composting(cO)and Biochar Use(BU)scenarios aiming at sustainability improvement were *** of multi-criteria and sensitivity analyses suggest that the optimal sustainable management scenario is cΟ,which involves on-site composting of organic solid waste,mainly produced at farm site,and subsequent application in the *** proposed methodology shows significant potential as a valuable multi-criteria tool that can be easily adapted at regional level to assist decision makers such as farmers and their associations,policy makers,local and regional authorities to efficiently explore a range of alternative farm management practices and thus identify pathways toward sustainability.

关键词： Sustainability Multi-criteria analysis LcA AHP Pistacia vera L. Sensitivity analysis

Statistical analysis on the influence of mechanical parameters in the vibration of pylons

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2023年第1期22卷 263-278页

作者： georgios I.Dadoulis George D.Manolis Laboratory for Experimental Mechanics Department of Civil EngineeringAristotle UniversityThessaloniki 54124Greece

We present a statistical investigation of the degree of influence that assumptions made in relation to the mechanical parameters of a pylon have on its ground-induced *** study is set up by using as a key kinematic variable the displacement at the top of a reference,a stand-alone pylon with a uniform cross-section and fixity at its ***,statistics are produced using a dimensionless displacement ratio defined between the‘parental’and the‘subsidiary’cases,the latter defined for the pylon(a)resting on compliant soil,(b)having an attached top mass,and(c)being non-uniform with ***,two materials are examined,namely,steel and reinforced concrete(R/c).More specifically,this displacement ratio is independent of the excitation and plays the role of a transfer function between the base and the top of the *** horizontal and vertical motions are considered,and the equations of motion are solved in the frequency *** ensuing statistical analysis is conducted for the following parameter combinations:(a)pylon founded on soft,intermediate,and stiff soil;(b)low,intermediate,and high-mass ratios of the attached mass to the pylon′s mass;(c)a constant and quadratic degree of pylon tapering with *** correlation coefficients are calculated for all the above combinations to arrive at statistical results that establish validity bounds and quantify the degree of influence of each assumption on the pylon′s response.

关键词： pylons statistical analysis spearman coefficients structural vibrations elastic waveguides attached masses soil springs tapering