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基于聚酰胺高效吸附剂和高效液相色谱-紫外检测的抗干扰方法用于同时测定番红花和尿液中3种苏丹染料(英文)

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色谱 2015年第1期33卷 29-34页

作者： iman saeidi Behruz BARFI Moazameh PAYROVI Javad FEIZY Hojat A SHEIBANI Mina MIRI Farahnaz GHOLLASI MOUD Iranian National Standards Organization Department of Chemistry University of Semnan Department of Chemistry University of Mazandran Testa Quality Control Laboratory Birjand University of Technology

With polyamide(PA)as an efficient sorbent for solid phase extraction(SPE)of Sudan dyes II,III and Red 7B from saffron and urine,their determination by HPLC was *** optimum conditions for SPE were achieved using 7 mL methanol/water(1∶9,v/v,pH 7)as the washing solvent and 3 mL tetrahydrofuran for *** clean-up and high(above 90%)recoveries were observed for all the *** optimized mobile phase composition for HPLC analysis of these compounds was methanol-water(70∶30,v/v).The SPE parameters,such as the maximum loading capacity and breakthrough volume,were also determined for each *** limits of detection(LODs),limits of quantification(LOQs),linear ranges and recoveries for the analytes were 4.6-6.6μg/L,13.0-19.8μg/L,13.0-5 000μg/L(r2>0.99)and 92.5%-113.4%,*** precisions(RSDs)of the overall analytical procedure,estimated by five replicate measurements for Sudan II,III and Red 7B in saffron and urine samples were 2.3%,1.8%and 3.6%,*** developed method is simple and successful in the application to the determination of Sudan dyes in saffron and urine samples with HPLC coupled with UV detection.

关键词：聚酰胺吸附剂固相萃取苏丹红

Determination of uncertainties of geomechanical parameters of metamorphic rocks using petrographic analyses

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 345-364页

作者： Behzad Dastjerdy Ali saeidi Shahriyar Heidarzadeh Department of Applied Sciences University of Quebec at ChicoutimiSaguenayQCCanada SNC-Lavalin MontrealCanada

Geomechanical parameters of intact metamorphic rocks determined from laboratory testing remain highly uncertain because of the great intrinsic variability associated with the degrees of *** aim of this paper is to develop a proper methodology to analyze the uncertainties of geomechanical characteristics by focusing on three domains,*** treatment process,schistosity angle,and ***,the variabilities of the geomechanical laboratory data of Westwood Mine(Quebec,Canada)were examined statistically by applying different data treatment techniques,through which the most suitable outlier methods were selected for each parameter using multiple decision-making criteria and engineering *** indicated that some methods exhibited better performance in identifying the possible outliers,although several others were unsuccessful because of their limitation in large sample *** well-known boxplot method might not be the best outlier method for most geomechanical parameters because its calculated confidence range was not acceptable according to engineering ***,several approaches,including adjusted boxplot,2MADe,and 2SD,worked very well in the detection of true ***,the statistical tests indicate that the best-fitting probability distribution function for geomechanical intact parameters might not be the normal distribution,unlike what is assumed in most geomechanical ***,the negative effects of schistosity angle on the uniaxial compressive strength(UCS)variabilities were reduced by excluding the samples within a specific angle range where the UCS data present the highest ***,a petrographic analysis was conducted to assess the associated uncertainties such that a logical link was found between the dispersion and the variabilities of hard and soft minerals.

关键词： Intact rock parameters Natural variabilities Outlier detection methods Uncertainties Westwood mine Mineralogy

Modelling of the variation of granular base materials resilient modulus with material characteristics and humidity conditions

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Journal of Road Engineering 2024年第1期4卷 27-35页

作者： Jean-Pascal Bilodeau Erdrick Leandro Perez-Gonzalez Ali saeidi Departement de Genie Civil et Genie des Eaux Universite LavalQuebecG1V 0A6Canada Departement des Sciences Appliquees Universite du Quebeca ChicoutimiChicoutimiG7H 2B1Canada

This study aims to quantify the susceptibility of granular materials used in pavements to changes in moisture content and propose a correlation model to incorporate this susceptibility into seasonal *** fines content and the percentage of fractured coarse aggregates were identified as direct indicators of the resilient modulus susceptibility to changes in water *** results showed that the percentage of fractured coarse aggregates particles(FR)has a more significant impact on the resilient modulus(Er)of crushed granular materials used in pavement construction than the combined indicator of the fines content and sample volumetrics(nf).Crushed granular materials with a higher percentage of fractured coarse aggregates are relatively insensitive to changes in the degree of saturation,but become more sensitive as the fine fraction porosity *** adjusted model was proposed based on the existing formulation,but considers a complex parameter to describe and adjust the sensitivity of base granular materials to variations in moisture content with respect to fabrication charac-teristics,fines content and volumetric *** model shows that the variation of Er values is below10%for fully crushed granular ***,it reaches approximately±12%for materials with 75%of crushed coarse aggregates andþ40%and-25%for materials with FR=50%.This model could help select good ag-gregates characteristics and adjust grain-size distribution for environments where significant moisture content variations can occur in the pavement system,such as in the Province of Quebec(Canada).As it is based on pa-rameters that can be easily determined or estimated,it also represents a valuable tool for detailed design and analysis that can consider material characteristics.

关键词： Resilient modulus Degree of saturation Humidity conditions Unbound granular materials Pavement base

Evaluation of the effect of geometrical parameters on stope probability of failure in the open stoping method using numerical modeling

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International Journal of Mining Science and Technology 2019年第3期29卷 399-408页

作者： Shahriyar Heidarzadeh Ali saeidi Alain Rouleau Department of Applied Sciences University of Quebec at Chicoutimi

Stress-induced failure is among the most common causes of instability in Canadian deep underground *** stoping is the most widely practiced underground excavation method in these mines,and creates large stopes which are subjected to stress-induced *** probability of failure(POF)depends on many factors,of which the geometry of an open stope is especially *** this study,a methodology is proposed to assess the effect of stope geometrical parameters on the POF,using numerical *** ranges for each input parameter are defined according to previous surveys on open stope geometry in a number of Canadian underground mines.A Monte-Carlo simulation technique is combined with the finite difference code FLAC3D,to generate model realizations containing stopes with different geometrical *** probability of failure(POF)for different categories of stope geometry,is calculated by considering two modes of failure;relaxation-related gravity driven(tensile)failure and rock mass brittle *** individual and interactive effects of stope geometrical parameters on the POF,are analyzed using a general multi-level factorial ***,mathematical optimization techniques are employed to estimate the most stable stope conditions,by determining the optimal ranges for each stope’s geometrical parameter.

关键词： Stope stability Stope geometrical parameters Probability of failure General factorial design Numerical modeling Sublevel open stoping

Efficient oxidative deprotection of trimethylsilyl,tetrahydropyranyl and methoxymethyl ethers under solvent-free conditions

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Chinese Chemical Letters 2008年第6期19卷 676-680页

作者： Farhad Shirini Saeideh saeidi Department of Chemistry College of ScienceUniversity of GuilanRasht 41335Islamic Republic of Iran

A mild, efficient and fast method for direct oxidation of trimethylsilyl, tetrahydropyranyl and methoxymethyl ethers to their corresponding carbonyl compounds using trinitratocerium（Ⅳ） bromate （TNCB） supported on... 详细信息

关键词： Oxidative deprotection Trinitratocerium(Ⅳ) bromate Trimethylsilyl ethers Tetrahydropyranyl ethers Methoxymethyl ethers

A Review on Applications of Integrated Terahertz Systems

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China Communications 2021年第5期18卷 175-201页

作者： Xuyang Lu Suresh Venkatesh Hooman saeidi University of Michigan–Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong UniversityShanghai 200240China Department of Electrical and Computer Engineering Princeton UniversityPrincetonNJ 08540USA

A review on Terahertz end-to-end systems with an emphasis on integrated approaches is *** major catalogs of THz integrated systems,including THz communication systems,THz imaging systems,THz radars,and THz spectroscopy systems,are reviewed in this *** performance of integrated systems is compared with non-integrated solutions,followed by a discussion on the trend in future research avenues and applications.

关键词： terahertz integrated circuit imaging communication spectroscopy on-chip antenna CMOS wireless transceivers phased array MIMO

A zero emission scheme for producing energy from natural gas hydrates and conventional natural gas

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Petroleum 2021年第4期7卷 364-384页

作者： Bj?rn Kvamme Navid saeidi Hyzenenergy Strategic Carbon LLC State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University

The global amount of energy contained in natural gas hydrates is huge,maybe as much as twice all known conventional fossil fuel *** the worldwide distribution of conventional fossil fuels,hydrocarbons trapped in water as hydrate is also available in countries with limited conventional hydrocarbon *** development towards lower global emissions of greenhouse gases requires new strategies for the use of hydrocarbons,whether they are available as conventional resources,or in the form of natural gas *** this work we outline some possible strategies of utilizing hydrocarbon energy resources in a clean and environmentally friendly *** use of carbon dioxide for producing hydrates is not *** from several experimental studies are *** this work we shed more light on thermodynamic limitations and the need for additives in order to make the approach technically *** thermodynamic analysis we show that up to 20 mol per cent N2is feasible in a CO2/N2injection gas based on ability to form a new hydrate with free pore water and the released enthalpy needed to dissociate in situ *** is also needed in order to keep the injection gas front free of blocking hydrate *** alcohols like methanol and ethanol have surfactant *** is demonstrated that even 10 wt% ethanol in liquid pore water still makes it feasible to create a new hydrate from injection gas containing 20 mol per cent *** of other components than CH4in the hydrate are also *** in practical cases with a well-defined source of CO2it is also important to investigate impact of other components like for instance H2S on the stability of injection gas hydrate,as well as changes in enthalpy of hydrate *** key element of this work is the conversion of produced hydrocarbons over to hydrogen and carbon dioxide using steam *** technology for this is very old and in daily use.

关键词： Hydrate Non-equilibrium Thermodynamics Kinetics

Integrated Intelligent Electromagnetic Radiator Design for Future THz Communication:A Review

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Chinese Journal of Electronics 2022年第3期31卷 499-515页

作者： LU Xuyang Venkatesh Suresh saeidi Hooman Sengupta Kaushik UM-SJTU Joint Institute Shanghai Jiao Tong University Electrical and Computer Engineering Princeton University

Advances in 6 G communication changes how machines and humans interact. The blossom of new applications demands significantly higher data bandwidth while preserving the mobility and sustainability of electronic wireless communication systems. It also demands an integrable system that allows convenient interactions between communication units and signal processing units.A review of CMOS-based THz communication system solutions is presented, with a focus on novel systematic EM-circuit co-design philosophy. This review starts with a review of THz power generation, followed by the discussion of THz localization and THz beamforming for efficient high-throughput communication.

关键词： Terahertz Integrated circuits CMOS 6G MIMO

A method to determine relevant geomechanical parameters for evaluating the hydraulic erodibility of rock

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1004-1018页

作者： Lamine Boumaiza Ali saeidi Marco Quirion Département des Sciences appliquées Universitédu QuébecàChicoutimiChicoutimiG7H 2B1Canada Expertise en barrages Direction Barrages et infrastructuresHydro-QuébecMontréalH2Z 1A4Canada

Among the methods used for evaluating the potential hydraulic erodibility of rock,the most common methods are those based on the correlation between the force of flowing water and the capacity of a rock to resist erosion,such as Annandale’s and Pells’*** capacity of a rock to resist erosion is evaluated based on erodibility indices that are determined from specific geomechanical parameters of a rock *** indices include unconfined compressive strength(UCS)of rock,rock block size,joint shear strength,a block’s shape and orientation relative to the direction of flow,joint openings,and the nature of the surface to be potentially ***,it is difficult to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of *** assessment of eroded unlined spillways of dams has shown that the capacity of a rock to resist erosion is not accurately *** more than 100 case studies,we develop a method to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock in unlined *** UCS of rock is found not to be a relevant parameter for evaluating the hydraulic erodibility of *** the other hand,we find that the use of three-dimensional(3D)block volume measurements,instead of the block size factor used in Annandale’s method,improves the rock block size ***,the parameter representing the effect of a rock block’s shape and orientation relative to the direction of flow,as considered in Pells’method,is more accurate than the parameter adopted by Annandale’s method.

关键词： Rock mass Hydraulic erodibility Geomechanical parameters Rock block size Annandale’s method Pells’method Kirsten’s index Erosion level