Industrial

Separation of Water from High pH Water-in-Heavy Oil Emulsions Using Low Pressure CO2
In this study, a demulsification treatment process for high pH water-in-oil (W/O) emulsions, using low pressure CO2 and demulsifier, with optimized temperature and mixing time is designed. The efficacy of different acids, including HCl and CH3COOH, are also examined using this method, to be compared with the results obtained with CO2 gas. Both the demulsifier and CO2 are indispensable in this d...


Zirconia-Supported Ruthenium Catalyst for Efficient Aerobic Oxidation of Alcohols to Aldehydes
We have developed the supported ruthenium catalyst (Ru(OH)x/ZrO2) that shows highly efficient catalytic performance for the oxidation of activated, nonactivated, and heterocyclic alcohols with only 1 atm of molecular oxygen as a green oxidant. The ruthenium active site gave excellent aerobic alcohol oxidation reaction (turnover number (TON) = 63 000). The catalyst was easily recovered after t...
The Elusive Wage-Benefits Trade-Off: The Case of Employer-Provided Health Insurance
This study shows that standard regressions estimated to measure a trade-off between wages and health insurance are misspecified by insufficiently accounting for establishment and firm size; an interactive, size-corrected specification is more likely to reveal a trade-off. Furthermore, because insurance decisions are typically made by firms, and wages set by establishments, the insurance constra...


Improvement of welding heat source models for TIG-MIG hybrid welding process
Tungsten inert gas-metal inert gas (TIG-MIG) hybrid welding process is an effective way to improve welding productivity and quality due to advantages of the two processes. Mathematical analysis is crucial to fundamentally understand this synergetic welding process. In this study, based on experimental visualization of arc behaviors, some assumptions are proposed to deduce adaptive plane and vol...
Experimental Investigation of Convective Heat Transfer Using Graphene Nanoplatelet Based Nanofluids under Turbulent Flow Conditions
An experimental investigation was performed to evaluate the heat transfer characteristics and the pressure drop of a graphene nanoplatelet (GNP) nanofluid in a horizontal stainless steel tube that was subjected to a uniform heat flux at its outer surface. The thermal conductivity and viscosity of the GNP nanofluids at concentrations of 0.025, 0.05, 0.075, and 0.1 wt % were measured prior to the...


Mechanisms of Aquifer Protection in Underground Coal Mining
Mining activities and geological conditions affect underground aquifers and surface water by different mechanisms. In this paper, we report three cases that illustrate some key factors and mechanisms to protect water supply during underground mining. Underground aquifers or surface water may be protected by controlling key strata movement, insuring an appropriate interburden thickness, and prot...
Optimal production control of a service-oriented manufacturing system with customer balking behavior
The great challenge for service-oriented manufacturing (SOM) is how to cope with customer behavior while making decision on production planning and scheduling. In this paper, we consider a single-stage manufacturing system for SOM with impatient customers. In order to represent customer balking behavior caused by backlog, we employ a balking function, which is an arbitrary non-decreasing functi...

Application of genetic algorithms for sequencing of AS/RS with a triple-shuttle module in class-based storage
Materials handling systems, as a main support to the dynamism of logistic systems, must be highly productive, well utilised, and very efficiently controlled. In the case of high volume, large capacity warehouse systems, an AS/RS (automatic storage/retrieval system) is a typical solution to these requirements. The performance of an AS/RS is closely related to the implementation of different cont...
Using Genetic Algorithms to solve scheduling problems on flexible manufacturing systems (FMS): a literature survey, classification and analysis
This paper reviews the literature regarding Genetic Algorithms (GAs) applied to flexible manufacturing system (FMS) scheduling. On the basis of this literature review, a classification system is proposed that encompasses 6 main dimensions: FMS type, types of resource constraints, job description, scheduling problem, measure of performance and solution approach. The literature review found 40 pa...

Inventory rationing for a system with heterogeneous customer classes
Many retailers find it useful to partition customers into multiple classes based on certain characteristics. We consider the case in which customers are primarily distinguished by whether they are willing to wait for backordered demand. A firm that faces demand from customers that are differentiated in this way may want to adopt an inventory management policy that takes advantage of this differ...
Process flexibility and inventory flexibility via product substitution
This paper studies the optimal control of and interaction between two types of flexibility under Markov models of demand and production: process flexibility and inventory flexibility. In our model, process flexibility is generated by a multi-functional production facility that can produce two types of products, and inventory flexibility is manifested in firm-driven one-way product substitution....

Transesterification of Waste Cooking Oil to Biodiesel Using KOH/γ-Al2O3 Catalyst in a New Two-Impinging-Jets Reactor
In this article, the transesterification of waste cooking oil (WCO) to biodiesel fuel (BDF) has been studied using KOH loaded on millimetric γ-Al2O3 particles in a novel type of two-impinging-jets reactor (TIJR). The effects of various parameters such as KOH loading (wt %), catalyst loading, and methanol-to-oil molar ratio on the BDF yield were studied. The catalyst particles with a KOH loadin...
Effect of Activated Sludge Retention Time, Operating Temperature, and Influent Phosphorus Deficiency on Floc Physicochemical Characteristics and UV Disinfection
Pilot-scale sequencing batch reactors (SBRs) were used to assess the effects of sludge retention time, temperature, and influent phosphorus level on floc physicochemical characteristics, effluent quality, and UV disinfection kinetics. Increasing the operating temperature from 12 to 22 °C caused an increase in the activated sludge flocs fractal dimension from 0.1 to 0.2, and improved the UV dis...
Aluminated Derivatives of Porous Magadiite Heterostructures for Acid-Catalyzed tert-Butylation of Catechol
Novel porous magadiite/Al-magadiite heterostructures (PMH/PAMH) and aluminated derivatives of PMH (xAl-PMH, x = Al/Si in feeding) were fabricated upon two-dimensional interlayer cosurfactant-directing TEOS hydrolysis–condensation–polymerization from synthetic Na-magadiite/Na-[Al]magadiite and postgrafting of Al into the interlayer silica framework of PMH from NaAlO2 precursor, respectively....
Evaluation of the Conductor-like Screening Model for Real Solvents for the Prediction of the Water Activity Coefficient at Infinite Dilution in Ionic Liquids
Ionic liquids (ILs) have attracted great attention, from both industry and academia, as alternative fluids for very different types of applications. The large number of cations and anions allow a wide range of physical and chemical characteristics to be designed. However, the exhaustive measurement of all these systems is impractical, thus requiring the use of a predictive model for their study...