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A carbon cycle optimization method for fossil and biomass energy utilization
Vasilios I. Manousiouthakis,최수형 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10
A carbon cycle model based environmental optimization method is proposed that minimizes the maximum and steady state atmospheric CO2 concentration. The proposed method is applied to a fossil to biomass energy transition problem. The optimization results indicate that a gradual change is more effective than immediate or delayed step changes, and that afforestation is essential in addition to reforestation. From these results, it is suggested that, in order to avoid a huge carbon debt, fossil fuels should be used as a complement until biomass resources are increased to an optimum level by afforestation. Furthermore, it is predicted that using biomass instead of fossils cannot fully recover the initial state, even if supported by intensive afforestation. The misleading concept of carbon neutrality of biomass is also clarified using the proposed model, which shows that biomass is not a preferable alternative to fossil fuels. Nonetheless, the proposed method is applicable to optimal energy utilization of fossil and biomass resources.
Vasilios Alevizakos,Richard Mosch,Gergo Mitov,Ahmed Othman,Constantin von See 대한치과보철학회 2021 The Journal of Advanced Prosthodontics Vol.13 No.3
Purpose. The aim of this study was to investigate to what extent cyclic load affects the screwless implant-abutment connection for Morse taper dental implants. Materials and Methods. 16 implants (SICvantage max) and 16 abutments (Swiss Cross) were used. The screwless implant-abutment connection was subjected to 10,000 cycles of axial loading with a maximum force of 120 N. For the pull-off testing, before and after the same cyclic loading, the required force for disconnecting the remaining 6 implant-abutment connections was measured. The surface of 10 abutments was examined using a scanning electron microscope 120× before and after loading. Results. The pull-off test showed a significant decrease in the vertical force required to pull the abutment from the implant with mean 229.39 N ± 18.23 before loading, and 204.30 N ± 13.51 after loading (P <.01). Apart from the appearance of polished surface areas and slight signs of wear, no visible damages were found on the abutments. Conclusion. The deformation on the polished abutment surface might represent the result of micro movements within the implant-abutment connection during loading. Although there was a decrease of the pull-off force values after cyclic loading, this might not have a notable effect on the clinical performance.
Foreign direct investment and productivity spillovers: a quantile analysis
Vasilios D. Kosteas 한국국제경제학회 2008 International Economic Journal Vol.22 No.1
This paper estimates the within-plant and spillover productivity effects of foreign investment in Mexican manufacturing plants. It contributes to the existing literature by analyzing whether FDI of North American origin differs from FDI from the rest of the world. I also use quantile regression analysis to determine whether spillovers are equal for plants of different productivity levels. The results indicate positive and significant spillovers from the presence of foreign firms. However, these spillovers accrue only to plants at the upper end of the productivity distribution. Furthermore, North American based FDI appears to yield slightly larger spillovers relative to FDI from the rest of the world; however the difference is not statistically significant. A deeper look at this issue reveals that Canadian FDI yields large productivity spillovers relative to both US and rest of the world FDI. These differences are highly statistically significant.
Georgakilas, Vasilios,Tiwari, Jitendra N.,Kemp, K. Christian,Perman, Jason A.,Bourlinos, Athanasios B.,Kim, Kwang S.,Zboril, Radek American Chemical Society 2016 Chemical reviews Vol.116 No.9
<P>This Review focuses on noncovalent functionalization of graphene and graphene oxide with various species involving biomolecules, polymers, drugs, metals and metal oxide-based nanoparticles, quantum dots, magnetic nanostructures, other carbon allotropes (fullerenes, nanodiamonds, and carbon nanotubes), and graphene analogues (MoS2, WS2). A brief description of pi-pi interactions, van der Waals forces, ionic interactions, and hydrogen bonding allowing noncovalent modification of graphene and graphene oxide is first given. The main part of this Review is devoted, to tailored functionalization for applications in drug delivery, energy materials, solar cells, water splitting, biosensing, bioimaging, environmental, catalytic, photocatalytic, and biomedical technologies. A significant part of this Review explores the possibilities of graphene/graphene oxide-based 3D superstructures and their use in lithium-ion batteries. This Review ends with a look at challenges and future prospects of noncovalently modified graphene and graphene oxide.</P>
Functionalization of Graphene: Covalent and Non-Covalent Approaches, Derivatives and Applications
Georgakilas, Vasilios,Otyepka, Michal,Bourlinos, Athanasios B.,Chandra, Vimlesh,Kim, Namdong,Kemp, K. Christian,Hobza, Pavel,Zboril, Radek,Kim, Kwang S. American Chemical Society 2012 Chemical reviews Vol.112 No.11
<P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/chreay/2012/chreay.2012.112.issue-11/cr3000412/production/images/medium/cr-2012-000412_0001.gif'></P>
Does Divestment Risk Evolution of MNE Subsidiaries Display an Inverse U-shaped Form?
Antonios Georgopoulos,Vasilios Sogiakas 세종대학교 경제통합연구소 2019 Journal of Economic Integration Vol.34 No.1
The current study investigates the evolutionary path of divestment risk of MNE subsidiaries in a regionally integrated area. Although descriptive statistics tend to indicate an inverse U-shaped path of divestment risk for the whole post-war era (1960-2015) included the protectionism period (1960-1980), the Kaplan-Meier survivor curve is monotonically decreasing across the three successive stages of the EU integration (1981-2015). Moreover, the econometric findings exhibit that divestment risk stabilization at the deep integration stage is due to investment in product differentiation and human capital and not to factor differentials such as tariffs and wage costs. To our best knowledge, this is the first study that explores evolution of foreign divestment risk into a gradually increasing integrated environment.
Christos Nanos,Vasilios Souftas,Athanasios Zissimopoulos,Michael I. Koukourakis 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.2
Purpose: Conventionally fractionated radiotherapy (CRT) is widely applied for the treatment of high-risk prostate cancer. Pelvic node irradiation improves control of the disease. Although the therapeutic guidelines support the use of hypofractionated and accelerated radiotherapy (HypoAR), this is addressed to prostate and seminal vesicles. At the same time, the safety and efficacy of HypoAR for pelvic node irradiation remain obscure. Materials and Methods: In a phase II study, we evaluated the feasibility of pelvic HypoAR in 22 high-risk prostate cancer patients. The RT scheme delivers 14 consecutive fractions of 3.67 Gy (total 51.38 Gy) to the prostate, 3.5 Gy (total 49 Gy) to the seminal vesicles, and 2.7 Gy (total 37.8 Gy) to the lymph nodes, using image-guided volumetric modulated arc therapy. A comparative radiobiological analysis of dose-volume histogram is performed (HypoAR vs. hypothetical equivalent CRT regimens, without and with time correction). Results: Our clinical experience shows impressively low early and short-term late toxicities, without any grade III events, within a median follow-up of 30 months. Only one biochemical relapse was recorded 30 months after irradiation. In radiobiological analysis, considering an α/β-value of 4 Gy and a λ-value of 0.2 Gy/day for late effects, all comparisons predicted significantly lower toxicity for the HypoAR regimen (p < 0.05). For early toxicities (α/β = 10 Gy), a λ-value lower than 0.4 Gy/day favors the HypoAR regimen, which is along with the clinical results. Conclusion: Radiobiological analysis favors HypoAR as a safe and effective regimen for high-risk prostate cancer patients, which is confirmed in the current phase II clinical study.
( Levan Maisuradze ),( Vasilios Marinos ),( Nikolaos Kazilis ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The current study deals with slope instability at the wider area of Zvare village, of Imereti region, central Georgia, central Caucasus, adjacent to railroad alignment. Conceptual engineering geological model was created in order understand better the behavior of the ground, so investigations in terms of Surface geological mapping, drilling and boring, laboratory tests and geotechnical monitoring was carried out. The landslide, of approximately 400m length and 230m wide, was activated at 13/05/2017 at the above mentioned region, due to excavations, which were carried out at the toe of old stabilized landslide, for the construction of railroad line. The mentioned landslide, although constitutes a complex system of minor landslides, generally is classified as a rotational andslide. Displacements approach 16m in lateral direction and 7m in vertical, respectively. The maximum depth of shearing due to boring and instrumentation, is estimated at depth of 40m, which through to back analysis shown shear strength of shear surface, expressed as Mohr Coulomb shear parameters, cohesion c=0 and friction angle φ=10°. This failure provides several geotechnical and social related problems. These deal with the safe construction and maintnanance of the new railway line, the maintenance of the river and the road. In addition, one main issue is the maintenance of the springs of natural carbonated water, which are also located at the left bank of the river. The area of springs is considered protected area.
Vasiliki Poulidou,Vasilios K. Kimiskidis 대한파킨슨병및이상운동질환학회 2022 Journal Of Movement Disorders Vol.15 No.3
We describe a patient presenting with secondary PKD due to an MS-related demyelinating lesion in the right cerebral peduncle. The patient failed to respond to steroids and levetiracetam but showed rapid improvement with lacosamide (LCM). A 35-year-old female presented to the emergency department of our hospital with a new-onset movement disorder. The patient experienced three brief episodes of tingling in the left part of her body followed by painful cramps in the past 24 hours.