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排序方式: 共有164条查询结果,搜索用时 15 毫秒
1.
This paper deals with the decomposition analysis of energy-related CO2 emissions in Greece from 1990 to 2002. The Arithmetic Mean Divisia Index (AMDI) and the Logarithmic Mean Divisia Index (LMDI) techniques are applied and changes in CO2 emissions are decomposed into four factors: income effect, energy intensity effect, fuel share effect and population effect. The period-wise and time series analyses show that the biggest contributor to the rise in CO2 emissions in Greece is the income effect; on the contrary, the energy intensity effect is mainly responsible for the decrease in CO2 emissions. A comparison of the results of the two techniques gave an insight in the intricacies of energy decomposition. Finally, conclusions and future areas of research are presented. 相似文献
2.
Collaborative defensive approaches such as collaborative intrusion detection system (CIDS) have emerged as a response to the continuous increase in the sophistication of cyberattacks. Such systems utilize a plethora of heterogeneous monitors to create a holistic picture of the monitored network. A number of research institutes deploy CIDSs that publish their alert data publicly over the Internet. This is important for researchers and security administrators, as such systems provide a source of real‐world alert data for experimentation. However, a class of identification attacks exists, namely probe‐response attacks (PRAs), which can significantly reduce the benefits of a CIDS. In particular, such attacks allow an adversary to detect the network location of the monitors of a CIDS. This article discusses the state of the art, with an emphasis on our previous and ongoing work, with regard to the detection and the mitigation of PRAs. We compare the most promising defensive mechanisms with respect to their effectiveness and the possible negative effects they might introduce to the CIDS. Finally, we provide a thorough discussion of research gaps and possible future directions for the field. 相似文献
3.
Emmanouil Kalligeros Xrysovalantis Kavousianos Dimitris Bakalis Dimitris Nikolos 《Journal of Electronic Testing》2002,18(3):315-332
In this paper we present a new reseeding technique for test-per-clock test pattern generation suitable for at-speed testing of circuits with random-pattern resistant faults. Our technique eliminates the need of a ROM for storing the seeds since the reseeding is performed on-the-fly by inverting the logic value of some of the bits of the next state of the Test Pattern Generator (TPG). The proposed reseeding technique is generic and can be applied to TPGs based on both Linear Feedback Shift Registers (LFSRs) and accumulators. An efficient algorithm for selecting reseeding points is also presented, which targets complete fault coverage and allows to well exploiting the trade-off between hardware overhead and test length. Using experimental results we show that the proposed method compares favorably to the other already known techniques with respect to test length and the hardware implementation cost. 相似文献
4.
Marios Sagris Emmanouil P. Vardas Panagiotis Theofilis Alexios S. Antonopoulos Evangelos Oikonomou Dimitris Tousoulis 《International journal of molecular sciences》2022,23(1)
Atrial fibrillation (AF) is the most frequent arrhythmia managed in clinical practice, and it is linked to an increased risk of death, stroke, and peripheral embolism. The Global Burden of Disease shows that the estimated prevalence of AF is up to 33.5 million patients. So far, successful therapeutic techniques have been implemented, with a high health-care cost burden. As a result, identifying modifiable risk factors for AF and suitable preventive measures may play a significant role in enhancing community health and lowering health-care system expenditures. Several mechanisms, including electrical and structural remodeling of atrial tissue, have been proposed to contribute to the development of AF. This review article discusses the predisposing factors in AF including the different pathogenic mechanisms, sedentary lifestyle, and dietary habits, as well as the potential genetic burden. 相似文献
5.
Abstract This work describes an improved method for radium/actinium separation as part of a process for the production of Ac‐225 from a Th‐229 source for targeted alpha therapy of cancer. The separation method is based on the use of a newly developed extraction chromatographic resin containing the diglycolamide (DGA) class of molecules. The weight distribution ratios of Ac(III) on the extraction chromatographic resins N,N,N′N′ tetraoctyldiglycolamide (TODGA) and N,N,N′N′ tetrakis‐2‐ethylhexyldiglycolamide (TEHDGA) (both Eichrom Inc.) were determined at varying nitric and hydrochloric acid concentrations by batch experiments to optimize conditions for the separation of Ac(III) from Ra(II). Consequently, a robust and rapid procedure based on the use of TEHDGA resin was developed yielding a carrier‐free, clinical‐grade Ac‐225 with an overall yield exceeding 98%. 相似文献
6.
7.
This paper deals with the causal relationship analysis between Gross Domestic Product, Energy Intensity and CO2 emissions in Greece from 1977 to 2007, by means of Johansen cointegration tests and Granger-causality tests based on a multivariate Vector Error Correction Modeling. Results indicate that there is a set of uni-directional and bi-directional causalities among the selected time series. We performed a model Variance Decomposition Analysis using Choleski technique and we provided a comparison with other studies. The findings of the study have significant policy implications for countries like Greece as the decoupling of CO2 emissions and economic growth seems quite unlikely. 相似文献
8.
Emmanouil Lioudakis Ioannis Alexandrou Andreas Othonos 《Nanoscale research letters》2009,4(12):1475-1480
Nowadays, organic solar cells have the interest of engineers for manufacturing flexible and low cost devices. The considerable
progress of this nanotechnology area presents the possibility of investigating new effects from a fundamental science point
of view. In this letter we highlight the influence of the concentration of fullerene molecules on the ultrafast transport
properties of charged electrons and polarons in P3HT/PCBM blended materials which are crucial for the development of organic
solar cells. Especially, we report on the femtosecond dynamics of localized (P2 at 1.45 eV) and delocalized (DP2 at 1.76 eV) polaron states of P3HT matrix with the addition of fullerene molecules as well as the free-electron relaxation
dynamics of PCBM-related states. Our study shows that as PCBM concentration increases, the amplified exciton dissociation
at bulk heterojunctions leads to increased polaron lifetimes. However, the increase in PCBM concentration can be directly
related to the localization of polarons, creating thus two competing trends within the material. Our methodology shows that
the effect of changes in structure and/or composition can be monitored at the fundamental level toward optimization of device
efficiency. 相似文献
9.
Emmanouil K. Oikonomou Vassilios Kilias Aggelos Goumas Alexandrous Rigopoulos Eirini Karakatsani Markos Damasiotis Dimitrios Papastefanakis Natassa Marini 《Energy Policy》2009,37(11):4874-4883
The increasing energy challenges faced, in particular, by isolated communities, such as insular communities, call for an integrated, flexible and easy-to-apply methodology aiming at providing a list of renewable energy sources) (RES) projects capable to reduce green house gas (GHG) emissions, satisfy future energy forecasts and reach the objectives of international/national energy directives and obligations, as, for example, the ones set by the Kyoto Protocol by 2010. The EU project EMERGENCE 2010 developed such a methodology that is implemented here in the case study of wind parks in the Dodecanese islands in Greece. The results obtained consist of a final list of financially viable RES wind projects, for which various barriers have been previously identified and assessed. The additional advantages of the proposed methodology is that besides providing as an end result a comprehensive list of RES projects adopted to specific criteria and regional priorities, it also allows space for involving – from early stages – the local community and stakeholders in the decision-making process (participatory planning); in this way, the EMERGENCE 2010 methodology may assist towards the RES promotion and public acceptance, the profitability of RES investments and the regional sustainable development. 相似文献
10.
Monitoring Charge Exchange in P3HT-Nanotube Composites Using Optical and Electrical Characterisation
Ioannis Alexandrou Emmanouil Lioudakis Dimitrios Delaportas C. Z. Zhao Andreas Othonos 《Nanoscale research letters》2009,4(7):635-639
Charge exchange at the bulk heterojunctions of composites made by mixing single wall nanotubes (SWNTs) and polymers show potential
for use in optoelectronic devices such as solar cells and optical sensors. The density/total area of these heterojunctions
is expected to increase with increasing SWNT concentration but the efficiency of solar cell peaks at low SWNT concentrations.
Most researchers use current–voltage measurements to determine the evolution of the SWNT percolation network and optical absorption
measurements to monitor the spectral response of the composites. However, these methods do not provide a detailed account
of carrier transport at the concentrations of interest; i.e., near or below the percolation threshold. In this article, we
show that capacitance–voltage (C–V) response of (metal)-(oxide)-(semiconducting composite) devices can be used to fill this gap in studying bulk heterojunctions.
In an approach where we combine optical absorption methods with C–V measurements we can acquire a unified optoelectronic response from P3HT-SWNT composites. This methodology can become an important
tool for optoelectronic device optimization. 相似文献