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Proposing a“lean and green”framework for equipment cost analysis in construction

Frontiers of Engineering Management 2019年第3期6卷 384-394页

作者： Ming LU Nicolas DIAZ monjurul hasan Department of Civil and Environmental Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

One limitation of previous productivity-driven research on equipment selection and operation simulation lies in the fact that the green aspects of construction activities have been largely neglected in analysis of costefficiency of construction *** the other hand,studies attempting to measure greenhouse gas emission due to construction activities have yet to develop a methodology that correlates their findings and implications with construction *** order to address the immediate need for improving the sustainability performance of construction projects,it is imperative for the construction industry to evaluate greenhouse gas emission as a cost factor in construction planning,equipment selection,and cost *** this context,this paper formalizes an integrative framework for equipment cost analysis based on the concepts of lean construction and green construction,aimed to guide the selection of appropriate construction equipment considering exhaust emission and productivity performance at the same *** framework is elaborated in earthwork construction in order to evaluate the impact of greenhouse gas emission in estimating equipment hourly rates and assessing greenness and sustainability for alternative equipment options.

关键词： green construction lean construction equipment simulation earthwork construction sustainability productivity

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Financial management for custom hire service of tractor in Bangladesh

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International Journal of Agricultural and Biological Engineering 2013年第3期6卷 28-33页

作者： Anisur Rahman Most.Latifunnahar Md monjurul Alam Department of Farm Power and Machinery Bangladesh Agricultural UniversityMymensingh-2202Bangladesh

The main purpose of the study was to determine the economic parameters and effective schedules for tractor *** data from various sources were used in this *** essential data were collected from primary sources through *** costs were calculated and project financial profitability was determined by four major factors on farm financial measurement techniques,namely,benefit-cost ratio(BCR),net present value(NPV),internal rate of return(IRR),and payback *** the economic use,land topography and cropping pattern was developed to effective scheduling for tractor *** operating cost of tractor with implement was found to be US$9.25 per *** replacement of the existing tractor on expiry of economic life,the entrepreneur has to save an amount of US$219 per year in a bank *** on the operating cost,annual savings for replacement and a profit margin for the entrepreneur,the rent-out charge of the tractor is estimated at US$11.58 per *** 10%interest rate,the NPV of the tractor at existing condition is US$*** NPV of tractor indicates that tractor entrepreneurship is considered financially sound and the project is financially viable,with an average IRR of 36.96%.This is because IRR of the tractor was higher than the bank interest rate and it is highly profitable from the viewpoint of individual *** Payback period of tractor with implement was determined as 2.03 *** minimum tenure for an economic use of a common tractor used in agriculture is about 6310 *** this critical use,the utilization of a tractor is economical for a tractor *** on the cropping pattern two major and one minor turn-around periods are available in between cropping seasons for tilling *** time available for tilling of land is estimated about 140 days at 12 hours a day in a *** strengthen the existing capacity of the tractor customer hire service entrepreneurs an

关键词： tractor operating cost economic parameter effective scheduling tractor entrepreneur Bangladesh

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Numerical Investigation of a modified Kalina cycle system for high-temperature application and genetic algorithm based optimization of the multi-phase expander’s inlet condition

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能源与人工智能(英文) 2021年第4期6卷 71-87页

作者： Mohammad Masrur Hossain MdSakib Hossain Niyaz Afnan Ahmed M monjurul Ehsan Department of Mechanical and Production Engineering Islamic University of TechnologyBoard BazarGazipur 1704Bangladesh

As an alternative to the conventional steam Rankine Cycle,Kalina Cycle has witnessed a growing interest over the past years for high-temperature applications(A working fluid temperature of 500◦C at the turbine inlet).However,the possibility of implementing an additional multi-phase expander on the weak ammonia-water solution loop of the Kalina cycle was hardly analyzed in the available *** this research,two novel Kalina cycles(Kalina cycle-12A and Kalina cycle-12B)have been presented by integrating a multi-phase expander in addition to the turbine installed downstream of the Kalina *** Kalina cycle-12A,this additional multi-phase expander is positioned downstream of the Kalina separator and on the weak ammonia-water solution loop for Kalina Cycle-12B.A detailed mathematical model based on the thermodynamic laws has been developed to solve and optimize the Kalina *** influence of critical decision parameters,specifically the ammonia concentration on working fluid and evaporation pressure,were *** optimization was performed based on the objective to maximize the net power output from the multi-phase expander under steady-state operating *** the performance of the proposed Kalina cycles was compared with the conventional Kalina Cycle-12,both of them demonstrated superior performance,i.e.,net power output and peak thermal efficiency increased by a maximum value of 3.23%for the proposed Kalina Cycle-12A cycle and 3.94%for the proposed Kalina Cycle-12B *** terms of second law efficiency,Kalina Cycle-12A is 3.68 percent more efficient than Kalina Cycle-12,while Kalina Cycle-12B is 4.04 percent more ***,2nd law analysis also reveals,maximum destruction of exergy occurs at the condensers of the cycles.

关键词： Kalina cycle Genetic algorithm-based optimization Exergy analysis High temperature

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Analysis of the Adsorption of Toxic Chromium (VI) by Untreated and Chitosan Treated Banana and Areca Fiber

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Journal of Textile Science and Technology 2020年第2期6卷 81-106页

作者： Hosne Ara Begum A. K. M. monjurul Haque Md. Didarul Islam M. Mehedi hasan Suza Ahmed Md. Razzak Ruhul Amin Khan Department of Yarn Engineering Bangladesh University of Textiles Dhaka Bangladesh Department of Applied Science & Chemical Engineering University of Dhaka Dhaka Bangladesh Department of Fabric Engineering Bangladesh University of Textiles Dhaka Bangladesh Institute of Radiation and Polymer Technology Bangladesh Atomic Energy Commission Dhaka Bangladesh

This paper work involves bunch experiments to investigate the effect of contact time, pH, and adsorbent dose on the extent of adsorption by bio-composites. Adsorption capacity of Chromium (VI) onto chitosan coated with banana and areca fiber was investigated in a batch system by considering the effects of various parameters like contact time, initial concentration, pH and adsorbent dose. The chitosan and fibers (banana and areca) were then cross-linked with glutaraldehyde to remove chromium [Cr (VI)] from water via static adsorption. It was found that optimum chromium absorption capacity of chitosan was assessed at pH of 2.5 to 4.5 and contact time of 30 to 180 minutes for raw banana and areca fiber and for chitosan treated banana & areca fiber. Though optimum adsorption of chromium of chitosan was measured 34.17 ppm (85.42%) from a 100 ml solution containing 40 parts per million (ppm) of Cr (VI) at 120 minutes, pH of 3.0 and 120 milligram (mg) adsorbent dose size, use of composite will be more favorable in the point of environmental concern as well as low cost because chitosan preparation is comparatively costly then banana and areca fiber. On the other hand, untreated banana and areca fiber optimum adsorption of chromium measured 3.65 ppm (9.1%) at 180 min and, pH of 4.5 and 140 mg adsorbent dose size and 3.76 ppm (9.4%) at 180 min, pH of 4.5 and 160 mg adsorbent dose size respectively. In case of chitosan treated banana fiber, it was observed that adsorption was increased from 17.664 to 30.057 (75.14%). On the other hand, for areca fiber with chitosan, it was observed that adsorption was increased from 21.664 to 30.156 (75.39%) ppm. The Langmuir and Freundlich adsorption models were used for the mathematical description of the adsorption of chromium ion onto composites and it was found that the Langmuir adsorption isotherm was more fitted models which mean that a monolayer adsorption surface was created. After analyzing from IBM SPSS 25 software, we got the stand

关键词： Adsorption Heavy Metal Chitosan Banana Fiber Areca Fiber Toxicity

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