This study employs the Taguchi method to approach the optimum co-gasification operation of torrefied biomass (eucalyptus) and coal in an entrained flow gasifier. The cold gas efficiency is adopted as the performance index of co-gasification. The influences of six parameters, namely, the biomass blending ratio, oxygen-to-fuel mass ratio (O/F ratio), biomass torrefaction temperature, gasification...

Among the renewable sources of energy, solar energy offers a practical solution for the energy problem which is clouding the prospects of mankind. The present paper deals with the experimental investigation of parameters of a solar parabolic trough in winter conditions and to obtain optimum process parameters by Grey Relational Analysis. The experiments were planned using Taguchi’s L9 orthogona...

The properties and performance of DDR ppnn Wurtzite Gallium Nitride (Wz-GaN) Impatt diodes at Terahertz (THz) frequencies has been investigated for optimum bias current density through modeling and simulation technique. A double iterative computer method based on drift-diffusion model has been used to study the DC and small signal admittance properties of the device. The bias current density is...

An improved model for the collision efficiency factor of clusters of oppositely charged spheres has been developed, which accounts for repulsive and attractive interactions that occur at a finite distance from the colliding species, i.e., the so-called "soft" interactions. Trends in measured optimum dosages for rapid aggregation with increasing Debye length (a decrease at particle size ratios b...

In this paper, incorporation of MISO concept is proposed as a solution for increasing energy efficiency and improving BER performance of OFDMCDMA downlink system with pilot tone and threshold detection combining (optimum TDC). The new presented system with MISO included uses spacetime block coding applied to two, three and four transmit antennas. BER (Bit Error Rate) performance in the case of ...

The seminal Buchanan-Ng club model is used to analyze optimal allocation of population between non-homogenous cities. Because of externalities (marginal welfare effects), migration cannot alone ensure efficiency and policy intervention is needed. In principle, a first-best optimum is achievable, if the externalities are properly calculated and internalized to people’s decisions by local or cent...

Background & objectives: Nitrate contamination of drinking water is a common problem in many parts of the world that poses a serious threat to public health and environment. In this research, the performance of a new rotary electrocoagulation reactor model for removal of nitrate in presence or absence of turbidity has been investigated. Methods: In this study, aluminum and iron electrodes were...

The electrical and structural behavior of uniformly mixed films of boron subphthalocyanine chloride (SubPc) and C60 and their performance in organic photovoltaic cells is explored. Device performance shows a strong dependence on active-layer donor–acceptor composition, and peak efficiency is realized at 80 wt.% C60. The origin of this C60-rich optimum composition is elucidated in terms of morph...

In the joint scalable video model (JSVM), selection of quantization parameters for mode decision (QPMD) and bit rate control (QPBC) is important for efficient coding performance. For quality (SNR) scalability, QPMD is adjusted only to the base layer QPBC in JSVM. Thus, it reduces coding efficiency in the enhancement layer. In this paper, we propose a new method for selecting optimum quantizatio...