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Optimum Environmental Load Design Criterion for Marine Structures Based on Investment and Benefit Analysis

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China Ocean Engineering 1998年第2期13卷 235-242页

作者： Zhang, sh Yu, Yf Li, BX Ocean Univ Qingdao Qingdao 266003 Peoples R China

Marine structures operating in natural ocean environment are subjected to various stochastic loads. for design of the marine structures, the most important task is to determine environmental load design criterion. This paper presents a method to determine the optimum environmental load design criterion for marine structures. This method is based on the investment and benefit analysis and it can reach the design purpose of decreasing total costs during the service life of the structures and increasing economic benefits.

关键词： marine structures investment-benefit analysis optimum environmental load design criterion

Evaluation of four Coals for Blast furnace Pulverized Coal Injection

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Journal of Iron and Steel Research International 2010年第3期17卷 8-12,20页

作者： sh Raygan H Abdizadeh A Eskandari Rizi School of Metallurgy and Materials Engineering University of Tehran

One of the effective methods of reducing coke consumption is pulverized coal injection. The most important problems encountered in this method are reduced permeability, unburned and high ash content. To select the best coal for injection, suitable tests can be used. Therefore, experiments such as proximate and ultimate analysis, Rock- Eval and combustion tests were performed on four kinds of coals from different mines, including Sarakhs, Sangrood, Karmozd, and Tabas. The results of proximate and ultimate analysis indicated that although the sulfur content and ash content of selected coals were a little high, they were suitable for coal injection. The results of combustion experiments and Rock-Eval tests showed that Karmozd coal was the best one to be injected into blast furnace. The result indicated that the mixing of coals could improve the combustion properties of pulverized coals.

关键词： pulverized coal blast furnace non-coking coal

EIGENfUNCTION EXPANSION fOR STURM-LIOUVILLE PROBLEMS wITH TRANSMISSION CONDITIONS AT ONE INTERIOR POINT

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Acta Mathematica Scientia 2015年第3期35卷 639-649页

作者： Oktay sh.MUKHTAROV Kadriye AYDEMIR Institute of Mathematics and Mechanics Azerbaijan National Academy of Sciences Department of Mathematics Faculty of ScienceGaziosmanpasa University

The purpose of this article is to extend some spectral properties of regular Sturm- Liouville problems to the special type discontinuous boundary-value problem, which consists of a Sturm-Liouville equation together with eigenparameter-dependent boundary conditions and two supplementary transmission conditions. we construct the resolvent operator and Green＇s function and prove theorems about expansions in terms of eigenfunctions in modified Hilbert space L2[a, b].

关键词： Boundary-value problems transmission conditions resolvent operator

Modelling and optimization of combined heat and power system in microgrid based on renewable energy

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Clean Energy 2023年第4期7卷 735-746页

作者： Ghassan f.Smaisim Azher M.Abed Salema K.Hadrawi Hasan sh.Majdi Ali shamel Department of Mechanical Engineering Faculty of EngineeringUniversity of Kufa54001Iraq Nanotechnology and Advanced Materials Research Unit(NAMRU) Faculty of EngineeringUniversity of Kufa54001Iraq Air Conditioning and Refrigeration Techniques Engineering Department Al-Mustaqbal University CollegeBabylon51001Iraq Refrigeration and Air-conditioning Technical Engineering Department College of Technical EngineeringThe Islamic UniversityNajafIraq Department of Chemical Engineering and Petroleum Industries Al-Mustaqbal University CollegeBabylon 51001Iraq Department of Chemistry Ardebil BranchIslamic Azad UniversityArdebilIran

Due to the short distance between the sources of production and consumption,microgrids(MGs)have received considerable attention because these systems involve fewer losses and waste less *** another advantage of MGs is that renewable energy sources can be widely used because these resources are not fully available and can provide a part of the required *** purpose of this research is to model the MG considering the production sources of microturbines,gas turbines and internal combustion *** energies such as wind turbines(wTs)and photovoltaic(PV)cells have been used to provide part of the required power and,because of the lack of access to renewable energy sources at all times,energy reserves such as batteries and fuel cells(fCs)have been *** power of the microturbine,gas turbine,internal combustion engine,fC and battery in this system is 162,150,90,100 and 225 kw,*** modelling the studied system,optimization was done using the imperialist competitive algorithm to minimize production costs and provide maximum thermal and electrical *** maximum production power for PVs is equal to 0.6860 Mwh and at this time this value for wTs is equal to 0.3812 Mwh,in which case the excess electricity produced will be sold to the grid.

关键词： microgrid energy management system optimization optimal power flow combined heat and power sustainable development

Essential commutant of analytic Toeplitz operators

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Chinese Science Bulletin 1997年第7期42卷 548-552页

作者： Ding, XH Sun, sh Department of Mathematics Sichuan Union University Chengdu China

LET Bn be the unit ball of Cn. The n-dimensional vector space over the complex field C, Sn=（?）Bn is the boundary of Bn. we use σ to denote the unique rotation-invariant probability measure on Sn. The Lebesgue space... 详细信息

关键词： Toeplitz operators inner function essential commutant.

Effects of Silicon Content and Intercritical Annealing on Manganese Partitioning in Dual Phase Steels

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Journal of Iron and Steel Research International 2010年第5期17卷 44-50页

作者： A Nouri H Saghafian sh Kheirandish Department of Metallurgy and Materials Engineering Iran University of Science and Technology

Steels of constant manganese and carbon contents with silicon content of 0.34 %- 2.26% were cast. The as-cast steels were then hot rolled at 1 100 ℃ in five passes to reduce the cast ingot thickness from 80 to 4 mm, air cooled to room temperature and cold rolled to 2 mm in thickness. Dual phase microstructures with different volume fraction of martensite were obtained through the intercritical annealing of the steels at different temperatures for 15 min followed by water quenching. In addition to intercritical annealing temperature, silicon content also altered the volume fraction of martensite in dual phase steels. The partitioning of manganese in dual phase silicon steels was investigated using energy-dispersive spectrometer （EDS）. The partitioning coefficient, defined as the ratio of the amounts of alloying element in the austenite to that in the adjacent ferrite, for manganese increased with increasing intercritieal annealing temperature and silicon content of steels. It was also found that the solubility of manganese in ferrite and austenite decreased with increasing intereritical temperature. The results were discussed by the diffusivity and the solubility of manganese in ferrite and austenite existed in dual phase silicon steels.

关键词： partitioning dual phase steel intercritical annealing temperature silicon manganese

Asymmetric Meerwein-Ponndorf-Verley reduction catalyzed by a new type of chiral binaphthol-samarium complex

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Chinese Journal of Chemistry 1996年第6期14卷 561-564页

作者： Ding, ZB Cheng, KJ wu, sh fUDAN UNIV DEPT CHEMSHANGHAI 200433PEOPLES R CHINA

A new type of chiral 1,1'-binaphthol(BINOL) derived samarium complex, prepared from (R)- or (S)-BINOL and SmCl3, serves as an enantioselective catalyst for the Meerwein-Ponndorf-Verley (MPV) reduction in the presence of Molecular Sieves 4 Angstrom(MS 4 Angstrom). Moderate enantioselectivity was obtained. Kinetic studies show slight decrease of the enantiomeric excess with the conversion.

关键词： asymmetric synthesis reduction samarium reagent

fluorescence Quenching and Depolarization Studies on Segmental Motion of Poly (N, N-dimethylacrylamide)

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Chinese Chemical Letters 1997年第8期8卷 719-720页

作者： Zhu, CY wu, sh Li, LR NANKAI UNIV DEPT CHEMTIANJIN 300071PEOPLES R CHINA

A new polymer, poly(N, N-dimethylacrylamide), labeled with acenaphthylene has been synthesized. The rotational relaxation time of this polymer has been studied using steady state fluorescence depolarization measuremen... 详细信息

关键词： fluorescence Quenching and Depolarization Studies on Segmental Motion of Poly N-dimethylacrylamide

PREPARATION Of Cr-POLYSTYRENE COMPLEX BY METALVAPOR SYNTHESIS

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Chinese Chemical Letters 1996年第7期7卷 679-680页

作者： wu, sh Zhu, CY Huang, wP NANKAI UNIV DEPT CHEMTIANJIN 300071PEOPLES R CHINA

Chromium atom-hexane solution prepared in a metal atom reactor was transferred into a solution containing polystyrene in diethylene glycol dibutyl ether at -78 degrees C, followed by gently warming the mixture to 0 degrees C to react for two hows, yielding a brown-green solid product Ultraviolet-visible and infrared spectra showed that the product was a bi- (eta(6)-arene) chromium complex.

关键词： Cr PREPARATION Of Cr-POLYSTYRENE COMPLEX BY METALVAPOR SYNTHESIS