Athens journal of sciences最新文献

{"title":"Selected Quantitative Parameters Comparison of Apples from Bio- and Conventional Production","authors":"M. Ján, Serralegri Davide","doi":"10.30958/AJS.5-4-3","DOIUrl":"https://doi.org/10.30958/AJS.5-4-3","url":null,"abstract":"Aims of the research were to compare quantitative and qualitative parameters of apples from organic and conventional (integrated) production in following attributes: fruit weight, fruit diameter, juice yield, total sugar content, total acid content, fructose, glucose, malic acid, total soluble solids (TSS) and pH. A statistically significant difference between fruit diameter and fruit weight in organic and conventional system was observed, meanwhile in nutrition values just pH showed difference (p≤0.05) among all 11 varieties. According to measured parameters variety groups were created. The best variety for organic production was Kanzi, followed by Morgenduft, Red Delicious and Red Chief. For conventional production Fuji and Gala showed the highest performance followed by Braeburn, Golden Delicious and Pink Lady. Granny Smith and Envy can be used in both organic and conventional systems with medium performance.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49224893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ignition Source Effect on Modelling Hydrogen Premixed Combustion","authors":"M. Yehia, S. Ibrahim, M. Fawzy","doi":"10.30958/ajs.5-3-1","DOIUrl":"https://doi.org/10.30958/ajs.5-3-1","url":null,"abstract":"This paper presents numerical study of premixed combustion of hydrogen-air mixtures inside a laboratory scale combustion chamber. The study is carried out on a premixed lean mixture of hydrogen/air flames with an equivalence ratio of 0.7. The main focus of the current work is to examine the effects of the way the source of ignition would have on the overall characteristics of combustion. An in-house Large Eddy Simulation (LES) modelling technique has been used to carry out the numerical simulations. The model predictions have been validated against available published experimental data where ignition has been introduced through the use of a laser beam. Successful numerical representation of the experimental initial and boundary conditions has resulted in good agreement between the experimental and numerical results for the generated combustion flame and pressure-time history. It was concluded that the combustion characteristics are sensitive to the size of the ignition source in terms of the timing occurrence of the peak pressure but not its magnitude. This finding has practical importance in analyzing explosion hazards, internal combustion engines and gas turbine combustors.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49056698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Approach for the Automated Detection of XSS Vulnerabilities in Web Templates","authors":"Sebastian Stigler, Gulshat Karzhaubekova, C. Karg","doi":"10.30958/ajs.5-3-4","DOIUrl":"https://doi.org/10.30958/ajs.5-3-4","url":null,"abstract":"Web sites are exposed to various threats such as injections or denial of service attacks. Hence, the protection of the web site and the underlying system components is of major importance in order to deploy a reliable and secure web application. The task of securing a web application is quite complex. It requires the hardening of the system components and installation of security patches on a regular basis. Furthermore, the web application should be checked against vulnerabilities by using penetration testing methods. From a developer’s point of view, security aspects should be considered in the early stage of web application’s development life cycle already. Of special interest is the web template which is used to generate the user interface of the web page. This component connects the web application to the outside world. Hence, it is the main entrance point to inject malicious things into the web application. In this paper, we present an approach to check web templates against cross site scripting (XSS) attacks in an automatic manner. The basic idea is inspired by the LLVM compiler which uses an internal representation to optimize the machine code independently from the used programming language. Instead of searching for vulnerabilities selectively in the template code itself, the web template is converted into an internal representation. This representation decouples the structure of the web template from the syntax of the template engine. The internal representation is analysed with respect to exploitable parts. The results of the analysis are potentially vulnerable code snippets. These snippets are coded back into the template format and are used within unit tests to check whether they can be exploited with actual attack vectors. The advantage of our approach is its universality; it works with any kind of web template engine.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44259386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Computer Science and Digitalization","authors":"Thomas Fehlmann","doi":"10.30958/AJS.5-3-3","DOIUrl":"https://doi.org/10.30958/AJS.5-3-3","url":null,"abstract":"","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49585356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stochastic Forecasting of Demographic Components Based on Principal Component","authors":"Patrizio Vanella","doi":"10.30958/ajs.5-3-2","DOIUrl":"https://doi.org/10.30958/ajs.5-3-2","url":null,"abstract":"","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45664160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characteristics of the Turbulence Processes in the Magnetohydrodynamic Environment","authors":"L. Kozak, B. Petrenko, E. Kronberg, E. Grigorenko, A. Lui","doi":"10.30958/AJS.5-2-1","DOIUrl":"https://doi.org/10.30958/AJS.5-2-1","url":null,"abstract":"Methods and approaches that can be used for analyzing the hydrodynamic and magnetohydrodynamic turbulent flows are proposed. It is shown that the best methods to characterize the types of turbulent processes are the methods of statistical physics. Within the statistical approach the fractal analysis (determination of the fractal length and height of the maximum of the probability density fluctuations of the studied parameters) and the multifractal analysis (study of a power dependence of high order statistical moments and construction multifractal spectrum) had been carried out. It is indicate that the statistical analysis of properties of turbulent processes can be supplemented by the spectral studies: Fourier and wavelet analysis. In order to test the methods and approaches we have used the magnetic field measurements from the space mission Cluster-II with a sampling frequency of 22.5 Hz in the Earth's magnetospheric tail. A good agreement between the investigations and the mutual additions to provide an overall view of the turbulence can be noted.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45903252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A Strategic Model for Forensic Readiness","authors":"J. Collie","doi":"10.30958/AJS.5-2-4","DOIUrl":"https://doi.org/10.30958/AJS.5-2-4","url":null,"abstract":"Forensic readiness has been defined as: ‘…the capability of an organisation to use digital evidence in a forensic investigation’. For businesses, especially medium or small enterprises, gaining this capability can seem time consuming and expensive: it may involve a number of processes, it may require new hardware and software and people with specialised skill sets may need to be hired in order to implement any plan. Yet developing and maintaining a forensic readiness capability is vital in the digital age. Fraud and cybercrime cost almost £11bn in the UK alone last year. Across the European Union, the national annual cost of cybercrime now accounts for 0.41% of GDP. Recent figures have also shown that up to 62% of digital incidents are caused by insiders, either accidentally or knowingly. An astonishing 91% of cybersecurity attacks begin with a single email. This research proposes a structured, strategic approach to forensic readiness for businesses that is economic to implement and run. It is based on people and processes rather than complex electronic systems. Key to this approach is a firm’s best asset - its own staff. It is theorised that the foundation stone of forensic readiness is a strong internal security culture. In order to achieve this aim, a unique, scalable model for efficient and inclusive planning is put forward with a reporting construct which aims to assure company-wide involvement.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45195264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Highly Selective and Sensitive Dual Channel Schiff Base Chemosesnsors for the Detection of Al(III), Fe(III) & Cu(II)","authors":"S. Sambamoorthy, A. Subbiah","doi":"10.30958/ajs.5-2-3","DOIUrl":"https://doi.org/10.30958/ajs.5-2-3","url":null,"abstract":"Two Schiff bases derived from 2,4-dihydroxy acetophenone were synthesised and characterized by IR, UV-Vis, 1 H NMR, Mass spectral studies and single crystal Xray diffraction studies. They were grown into a single crystal in 1:1 ethanol acetonitrile medium by slow evaporation technique and belong to monoclinic crystal system with P21/c space group. Hirshfeld surface analysis based on DFT method with 3-21G as basis set was used to calculate various intermolecular interactions. Finger print plots were made to find out the percentage of different types of interactions. The cation recognizing profile of the Schiff base receptors were explored by UV-Vis and fluorescence methods. The receptor 1 NMEPDHAPI was found to recognize Al 3+ and the receptor 2 NMPDHAPIwas found to recognize Fe 3+ and Cu 2+ ions selectively over a panel of other metal ions such as Na + , Mg 2+ ,Ca 2+ ,Mn 2+ , Co 2+ , Ni 2+ , Zn 2+ , Sr 2+ ,Cd 2+ ,Ba 2+ ,Hg 2+ and Pb 2+ . The stoichiometry ratio of the receptors with Al 3+ and Fe 3+ &Cu 2+ obtained by the Job’s plot was 2:1. The binding constant of the receptor 1 for Al 3+ was 10.11 X 10 3 and that ofreceptor 2 for Fe 3+ and Cu 2+ were 1.43 X 10 +2 and 1.65 X 10 +2 respectively. The detection limits for Al 3+ , Fe 3+ and Cu 2+ were 6.5318 X 10 -9 M, 1.265 X 10 -6 M and 4.086 X 10 -6 M respectively.","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41991648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An Assessment of Biomass Supply Chain: A DEA Application","authors":"Isotilia Costa Melo, A. Rentizelas, P. N. A. Junior, J. Campoli, D. Rebelatto","doi":"10.30958/AJS.5-2-2","DOIUrl":"https://doi.org/10.30958/AJS.5-2-2","url":null,"abstract":"Renewable energy generation reduces carbon emissions and responds to the targets for renewable energy sources of most EU countries; it also enhances infrastructure resilience and creates flexibility of the energy matrix. However, the availability of biomass may drastically differ from country to country within the EU. In most cases, the most challenged countries to achieve high targets for sustainability are not those with a sufficiently large supply of biomass. Because of this, it is necessary to design new biomass supply chain networks and improve the existing networks. This paper aims to assess the efficiency of biomass alternative pathways of the supply network from South America to Europe. In this particular work, three scenarios of biomass using two transportation systems were investigated, i.e., transportation of wood logs, pellets and torrefied biomass in the country of origin by truck and train transportation. Efficiency was measured using a data envelopment analysis (DEA) model derived from CCR. The results present the most efficient supply chain alternatives and highlight the feasibility of establishing closer cooperation between Brazil and countries in Europe for green energy generation. This information can assist in the process of planning and decision-making to determine the practicability of the implementation of torrefaction facilities using the most efficient logistical pathways","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48535903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Incorporating Fermentation into Undergraduate Laboratory Courses.","authors":"Claire Gober,&nbsp;Madeleine Joullie","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>Laboratory courses in universities have a responsibility to introduce current research practices and trends in scientific research to adequately prepare students for work in the field. One such research practice gaining popularity in recent years is that of green chemistry. Since the 1960s, increasing concern over the release of toxic chemicals into the environment has led to a push for more environmentally responsible chemistry. A growing faction of chemists has begun to adopt methods to eliminate chemical waste and support green chemistry. Fermentation is an ideal technique to demonstrate environmentally sustainable chemistry in an undergraduate laboratory class. Fermentation of complex natural products, as opposed to traditional organic synthesis, is beneficial as it supports a number of principles of green chemistry; it is conducted at ambient temperature and pressure, uses inexpensive and innocuous materials, makes use of renewable resources, and does not require a fume hood. Skills implemented during fermentation can be easily taught to upper-level Chemistry and Biochemistry undergraduate students, who typically have limited exposure to complex natural products in their coursework. Such a course would be interdisciplinary in nature, incorporating fungal biology and metabolism as well as organic chemistry. Students would learn a variety of skills, including growth media selection and preparation, inoculation of fungal cultures, extraction of natural products, and purification and characterization of metabolites. Experiments of this nature would allow for discussions of several areas of research: green chemistry, natural products and their application to medicine, identification of functional groups in complex molecules by spectroscopy, and introduction to biochemistry and metabolism. Roquefortine C, a prenylated indole alkaloid readily produced by a variety of species of Penicillia, is an excellent candidate for demonstrating fermentation in a laboratory classroom setting, owing to its ease of purification from other metabolites and its unique structural features.</p>","PeriodicalId":91843,"journal":{"name":"Athens journal of sciences","volume":"2 4","pages":"257-264"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5438208/pdf/nihms822198.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"35015478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}