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Porous media grain size distribution and hydrodynamic forces effects on transport and deposition of suspended particles

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Journal of Environmental Sciences 2017年第3期29卷 161-172页

作者： Nasre-Dine Ahfir Ahmed Hammadi abdellah alem HuaQing Wang Gilbert Le Bras Tariq Ouahbi Normandie University UNIHAVREUMR 6294 CNRSLOMC76600 Le HavreFrance GeM UMR 6183 CNRSUniuersite de NantesBP 42044606 Saint Nazaire CedexFrance

The effects of porous media grain size distribution on the transport and deposition of polydisperse suspended particles under different flow velocities were investigated. Selected Kaolinite particles （2-30 μm） and Fluorescein （dissolved tracer） were injected in the porous media by step input injection technique. Three sands filled columns were used： Fine sand, Coarse sand, and a third sand （Mixture） obtained by mixing the two last sands in equal weight proportion. The porous media performance on the particle removal was evaluated by analysing particles breakthrough curves, hydro-dispersive parameters determined using the analytical solution of convection-dispersion equation with a first order deposition kinetics, particles deposition profiles, and particle-size distribution of the recovered and the deposited particles. The deposition kinetics and the longitudinal hydrodynamic dispersion coefficients are controlled by the porous media grain size distribution. Mixture sand is more dispersive than Fine and Coarse sands. More the uniformity coefficient of the porous medium is large, higher is the filtration efficiency. At low velocities, porous media capture all sizes of suspended particles injected with larger ones mainly captured at the entrance. A high flow velocity carries the particles deeper into the porous media, producing more gradual changes in the deposition profile. The median diameter of the deposited particles at different depth increases with flow velocity. The large grain size distribution leads to build narrow pores enhancing the deposition of the particles by straining.

关键词： Suspended particlesPorous mediaGrain size distributionStructured heterogeneityStrainingParticle size distribution

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Hybritus:a password strength checker by ensemble learning from the query feedbacks of websites

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Frontiers of Computer Science 2020年第3期14卷 189-202页

作者： Yongzhong HE Endalew Elsabeth alem Wei WANG Beijing Key Laboratory of Security and Privacy in Intelligent Transportation Beijing Jiaotong UniversityBeijing 100044China

Password authentication is vulnerable to dictionary *** strength measurement helps users to choose hard-to-guess passwords and enhance the security of systems based on password *** there are many password strength metrics and tools,none of them produces an objective measurement with inconsistent policies and different *** this work,we analyzed the password policies and checkers of top 100 popular websites that are selected from Alexa *** checkers are inconsistent and thus they may label the same password as different strength labels,because each checker is sensitive to its configuration,e.g.,the algorithm used and the training *** are empowered to exploit the above vulnerabilities to crack the protected systems more *** such,single metrics or local training data are not enough to build a robust and secure password *** on these observations,we proposed Hybritus that integrates different websites'strategies and views into a global and robust model of the attackers with multiple layer perceptron(MLP)neural *** data set is comprised of more than 3.3 million passwords taken from the leaked,transformed and randomly generated *** data set were sent to 10 website checkers to get the feedbacks on the strength of passwords labeled as strong,medium and *** we used the features of passwords generated by term frequency-inverse document frequency to train and test *** experimental results show that the accuracy of passwords strength checking can be as high as 97.7%and over 94%even if it was trained with only ten thousand *** study shows that Hybritus is usable as well as secure.

关键词： password password strength,password checker,neural networks

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Factors affecting farmers’participation in watershed management programs in the Northeastern highlands of Ethiopia:a case study in the Teleyayen sub-watershed

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Ecological Processes 2018年第1期7卷 137-151页

作者： alem-meta Assefa Agidew K.N.Singh Department of Geography and Environmental Studies Wollo UniversityP.O.Box 1145DessieEthiopia Department of Geography and Environmental Studies Addis Ababa UniversityP.O.Box 1176Addis AbabaEthiopia

Introduction:This study investigated factors affecting farmers’participation in watershed management programs in the Northeastern highlands of Ethiopia by taking the Teleyayen sub-watershed as a case *** were collected from 215 farm households which were selected from the four villages using a multistage sampling procedure,involving a combination of purposive and random *** were gathered using a structured survey questionnaire,focus group discussion,and key informant *** analysis,Pearson correlation analysis,and regression analysis were employed to analyze the ***:Findings of this study showed that farmer’s perception has a strong positive correlation(r=0.612,P=0.000)with the farmer’s decision to participate in the watershed management programs followed by government support(r=0.163,P=0.017),while the slope of the farmland and the gender of the household head have shown significant and negative *** binary logistic regression analysis also revealed that six independent variables were significant in explaining the factors affecting the farmers’decision to participate in watershed management *** variables were land redistribution,gender,agricultural labor force,extension service,farm size,and *** these,land redistribution,gender,agricultural labor force,extension service,and slope of the farmland indicated a negative influence,while farm size of a household exerted a positive *** study also examined the role of discrete variables in explaining variations of variables in affecting the farmers’decision to participate in the ***,two variables found to be *** variables are the gender of the household head and land tenure ***,the chi-square result of the variable(χ^(2)=9.052)of gender was found to be statistically significant at the 95%level of ***,the chi-square result(X^(2)=8.792)of land tenure security was found to be statistically

关键词： Binary logistic regression model Ethiopia Farmers’participation Watershed management

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Preoperative selection of patients with colorectal cancerliver metastasis for hepatic resection

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World Journal of Gastroenterology 2016年第2期22卷 567-581页

作者： Rafif E Mattar Faisal A Al-alem Eve Simoneau Mazen Hassanain Department of Surgery College of MedicineKing Saud UniversityRiyadh 11461Saudi Arabia Department of Surgery McGill University Health CentreHepatopancreaticobiliary Research UnitMontrealQC H4A 3J1Canada Department of Oncology McGill University Health CenterMontrealQC H4A 3J1Canada

Surgical resection of colorectal liver metastases(CRLM) has a well-documented improvement in survival. To benefit from this intervention, proper selection of patients who would be adequate surgical candidates becomes vital. A combination of imaging techniques may be utilized in the detection of the lesions. The criteria for resection are continuously evolving; currently, the requirements that need be met to undergo resection of CRLM are: the anticipation of attaining a negative margin(R0 resection), whilst maintaining an adequate functioning future liver remnant. The timing of hepatectomy in regards to resection of the primary remains controversial; before, after, or simultaneously. This depends mainly on the tumor burden and symptoms from the primary tumor. The role of chemotherapy differs according to the resectability of the liver lesion(s); no evidence of improved survival was shown in patients with resectable disease who received preoperative chemotherapy. Presence of extrahepatic disease in itself is no longer considered a reason to preclude patients from resection of their CRLM, providing limited extra-hepatic disease, although this currently is an area of active investigations. In conclusion, we review the indications, the adequate selection of patients and perioperative factors to be considered for resection of colorectal liver metastasis.

关键词： Colorectal cancer liver metastases Liverresection Hepatectomy Patient selection Preoperativeselection

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Boron Nitride-Integrated Lithium Batteries:Exploring Innovations in Longevity and Performance

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Energy & Environmental Materials 2024年第6期7卷 13-40页

作者： Shayan Angizi Sayed Ali Ahmad alem Mahdi Torabian Maryam Khalaj Dmitri Golberg Amir Pakdel Department of Chemical Engineering McMaster University1280 Main St WHamiltonONL8S 4L7 Canada Institute of Chemistry of Polymeric Materials Montanuniversität LeobenOtto-Glöckel-Strasse 2A-8700 LeobenAustria Department of Chemistry Materials and Chemical EngineeringPolitecnico di MilanoPiazza Leonardo da Vinci 3220133 MilanItaly Department of Materials Science and Engineering Northwestern UniversityEvanstonIL60208 USA Centre for Materials Science and School of Chemistry and Physics Queensland University of Technology(QUT)2 GeorgeBrisbaneQLD4000 Australia Research Centre for Materials Nanoarchitectonics(MANA) National Institute for Materials Science(NIMS)Namiki 1Ibaraki3050044 Japan Department of Mechanical Manufacturing and Biomedical EngineeringTrinity College DublinThe University of DublinDublinD02PN40 Ireland

The current global warming,coupled with the growing demand for energy in our daily lives,necessitates the development of more efficient and reliable energy storage *** batteries(LBs)are at the forefront of emerging power sources addressing these *** studies have shown that integrating hexagonal boron nitride(h-BN)nanomaterials into LBs enhances the safety,longevity,and electrochemical performance of all LB components,including electrodes,electrolytes,and separators,thereby suggesting their potential value in advancing eco-friendly energy *** review provides an overview of the most recent applications of h-BN nanomaterials in *** begins with an informative introduction to h-BN nanomaterials and their relevant properties in the context of LB ***,it addresses the challenges posed by h-BN and discusses existing strategies to overcome these limitations,offering valuable insights into the potential of BN *** review then proceeds to outline the functions of h-BN in LB components,emphasizing the molecular-level mechanisms responsible for performance ***,the review concludes by presenting the current challenges and prospects of integrating h-BN nanomaterials into battery research.

关键词： electrode electrolyte hexagonal boron nitride lithium battery separator

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Optimization Model Proposal for Traffic Differentiation in Wireless Sensor Networks

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Computers, Materials & Continua 2024年第10期81卷 1059-1084页

作者： Adisa Haskovic Dzubur Samir Causevic Belma Memic Muhamed Begovic Elma Avdagic-Golub alem Colakovic Faculty of Traffic and Communications University of SarajevoSarajevo71000Bosnia and Herzegovina

Wireless sensor networks(WSNs)are characterized by heterogeneous traffic types(audio,video,data)and diverse application traffic *** paper introduces three traffic classes following the defined model of heterogeneous traffic differentiation in *** requirements for each class regarding sensitivity to QoS(Quality of Service)parameters,such as loss,delay,and jitter,are *** classes encompass real-time and delay-tolerant *** that QoS evaluation is a multi-criteria decision-making problem,we employed the AHP(Analytical Hierarchy Process)method for multi-criteria *** a result of this approach,we derived weight values for different traffic classes based on key QoS factors and *** weights are assigned to individual traffic classes to determine transmission *** study provides a thorough comparative analysis of the proposed model against existing methods,demonstrating its superior performance across various traffic scenarios and its implications for future WSN *** results highlight the model’s adaptability and robustness in optimizing network resources under varying conditions,offering insights into practical deployments in real-world ***,the paper includes an analysis of energy consumption,underscoring the trade-offs between QoS performance and energy *** study presents the development of a differentiated services model for heterogeneous traffic in wireless sensor networks,considering the appropriate QoS framework supported by experimental analyses.

关键词： Wireless Sensor Networks(WSNs) traffic differentiation traffic classes Quality of Services(QoS) multi-criteria optimization Analytical Hierarchy Process(AHP)

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Smallanthus sonchifolius roots ameliorate non-alcoholic fatty liver disease by reducing redox imbalance and hepatocyte damage in rats fed with a high fructose diet

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Asian Pacific Journal of Tropical Biomedicine 2019年第9期9卷 365-372页

作者： Mariano Nicolás alemán Sara Serafina Sánchez Stella Maris Honoré Instituto Superior de Investigaciones Biológicas (INSIBIO) Consejo Nacional de Investigaciones Científicas y Técnicas - Universidad Nacional de Tucumán (CONICET-UNT)

Objective: To evaluate the potential of Smallanthus sonchifolius(S. sonchifolius) roots in ameliorating hepatic damage of rats fed with a high fructose ***: The effect of S. sonchifolius roots on energy intake, body weight, fat and liver mass was determined in male rats fed with a high-fructose diet. Plasma glucose, triglycerides, total cholesterol, lipoproteins and aspartate aminotransferase and alanine aminotransferase were analyzed. Histological changes of the livers were evaluated by electronic microscopy and apoptosis was examined using the TUNEL method. The levels of malondialdehyde, reducedglutathione and antioxidant enzymes(catalase, superoxide dismutase, glutathione peroxidase, glutathione S-transferase) activities were also ***: S. sonchifolius roots significantly decreased energy intake, body weight, fat and liver mass(P < 0.05). S. sonchifolius roots ameliorated liver steatosis and mitochondrial morphology, avoiding cellular apoptosis and normalizing transaminase activity in the liver of rats fed with high fructose. Enzymatic assays revealed that S. sonchifolius roots had a modulatory effect on the oxidative stress induced by fructose-feeding by reducing lipid peroxidation(P < 0.05) and antioxidant enzyme activities(P < 0.05) in ***: S. sonchifolius roots can ameliorate non-alcoholic fatty liver disease by improving oxidative stress and liver injury.

关键词： Smallanthus sonchifolius roots Non-alcoholic fatty liver disease Oxidative stress Apoptosis Liver

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A comparative assessment on regeneration status of indigenous woody plants in Eucalyptus grandis plantation and adjacent natural forest

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Journal of Forestry Research 2009年第1期20卷 31-36页

作者： Shiferaw alem Tadesse Woldemariam Ethiopian Institute of Agricultural Research Forestry Research Center P.O. Box 30708 Addis Ababa Ethiopia Addis Ababa University Department of Biology Education P.O.Box 1176 Addis Ababa Ethiopia

Diversity, density and species composition of naturally regenerated woody plants under Eucalyptus grandis plantation and the adjacent natural forest were investigated and compared. Twenty plots, with an area of 20 m × 20 m for each, were established in both of E. grand＆ plantation and adjacent natural forest, independently. In each plot, species name, abundance, diameter and height were recorded. Numbers of seedling were collected in five sub-plots （4 m2） within each major plot. A total of 46 species in the plantation, and 52 species in the natural forest, which belongs to 36 families were recorded. The diversity of species （H＇） is 2.19 in the plantation and 2.74 in the natural forest. The density of understory woody plant was 3842 stems/ha in the plantation and 4122 stems/ha in the natural forest. The densities of seedlings in the natural forest and the plantation were 8101 stems/ha and 4151 stems/ha, respectively. High similarity of woody species composition was found between the natural forest and the plantation. The E. grand＆ plantation was found favoring the regeneration and growth of Millitiaferruginia and Coffea arabica in a much better way than other underneath woody species.

关键词： E. grandis, natural forest natural regeneration plantation woody species diversity

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The TV as a Space of Identification and Differentiation

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Journalism and Mass Communication 2012年第12期2卷 1106-1114页

作者： Beatriz alem General Sarmiento National University (UNGS) Los Polvorines Argentina University of Buenos Aires (UBA) City of Buenos Aires Argentina

The objective of this article is to work the media representation of citizens＇ rights in television news. We have taken a particular case which happened in the province and the autonomous City of Buenos Aires, Argentina during the second week of December 2010. Such circumstances were in opposition to housing rights and property. We selected a sample of three evening news （two private and one public） Telenoche, Telefe News, and Vision 7, with the intention of establishing a line of comparison in both media, and thereby recognizing the differences in patterns of representation the news. From the analysis of data, we realize the ways in which TV News defined the citizen complaint.

关键词： othemess citizenship stigma security

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Software Vulnerabilities Overview:A Descriptive Study

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Tsinghua Science and Technology 2020年第2期25卷 270-280页

作者： Mario Calín Sánchez Juan Manuel Carrillo de Gea José Luis Fernández-alemán Jesús Garcerán Ambrosio Toval the Department of Informatics and Systems Faculty of Computer ScienceUniversity of Murcia

Computer security is a matter of great *** the last decade there have been numerous cases of cybercrime based on the exploitation of software *** fact has generated a great social concern and a greater importance of computer security as a *** this work,the most important vulnerabilities of recent years are identified,classified,and categorized individually.A measure of the impact of each vulnerability is used to carry out this classification,considering the number of products affected by each vulnerability,as well as its *** addition,the categories of vulnerabilities that have the greatest presence are *** on the results obtained in this study,we can understand the consequences of the most common vulnerabilities,which software products are affected,how to counteract these vulnerabilities,and what their current trend is.

关键词： descriptive study software security software vulnerabilities vulnerability databases

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