Prediction of physical properties of oil palm biomass reinforced polyethylene: Linear regression approach

In recent years, there has been an increasing interest on renewable resources for consumer products and biodegradable materials.Traditional polymeric materials derived from petro-chemical sources do not degrade and disposal of such materials is a major concern in minimizing the environmental problems. Currently, experiments are carried out in laboratories to determine the physical properties of degradable plastics which include melt flow index (MFI), melting point (MP) and Density.Oil palm biomass (OPB) is used as bio-active components in the formulation with Polyethylene (PE).Alternatively, a different approach is required as to minimize the time consume, the cost of production and the cost of labor.In this study, Linear Regression model has been developed and used to predict the physical properties of degradable plastics.The ability of Linear Regression model is assessed by comparing the theoretical results with the actual lab results using correlation coefficient (r) and coefficient of determination (R2).The result showed that the percentage prediction accuracy for MFI is 93%, 71% for the prediction of MP and 24% for the prediction of Density respectively using linear regression.The study proves that the use of Linear Regression model for predicting the physical properties of degradable plastics is highly feasible

Lambda-max criteria weight determination in an adaptive neuro-fuzzy inference system / Rosma Mohd Dom, Daud Mohamad and Ajab Bai Akbarally

Fuzzy inference is the process of formulating the mapping from a given input to an output using fuzzy logic. The primary mechanism for fuzzy inference engine involves a list of if- then statement called rules. A neuro-fuzzy system is a fuzzy system that uses learning algorithms derived from or inspired by neural network theory to determine its parameters (fuzzy sets and fuzzy rules) by processing data samples. In simple terms a neuro-fuzzy system is a combination of fuzzy logic and neural network in generating a model that produces required output (Oke S.A et a/., 2006). The existing method in determining the weights in the Adaptive Neuro-Fuzzy Inference System (ANFIS) is questionable since only simple multiplication (algebraic t-norm) is used. In fuzzy mathematics, criteria weights determination can be carried out using many available techniques such as the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS), Analytic Hierarchy Process (AHP), Multi Attribute Utility Theory (MAUT), Multi Attribute Value Theory (MAVT) and the Fuzzy Preference Relation (FPR). There are three methods of calculating the fuzzy criteria weights using the Analytic Hierarchy Process (AHP) namely the Extend Analysis, Lambdamax and the Least Squares method. Each method has its own strengths and limitations. In this research we will use the Lamda-max method of the AHP to determine the criteria weights to replace the weights used in the existing ANFIS. Literatures have shown that the Extend Analysis method is not suitable when it involves extreme values (zero weights) and the Least Squares method requires an extensive amount of computing application. Thus the Lamda-max method is the most appropriate method to be used in this research. The first objective of this research is to improvise the existing ANFIS by applying the chosen criteria weight determination Lamda-max in developing the neuro-fuzzy system. The second objective is to assess the ability of the Modified ANFIS by comparing the performance of the Modified ANFIS with the Conventional ANFIS.In assessing the performance of Modified ANFIS we will use it to identify factors affecting the tensile strength of plastics. Currently experiments were carried out in the labs to help determine such contributing factors. The process can be very time consuming and costly. This research proposes a soft computing model specifically the Modified ANFIS model to help identify the contributing factors. The Modified ANFIS will be used to investigate the influence of fiber size, pH value, ash content, moisture content, pH value, density, melt flow rate and thermal transition on the tensile strength of plastic

Coefficient estimates for Ruscheweyh derivatives

We consider functions f, analytic in the unit disc and of the normalized form f(z)=z+∑n=2∞anzn. For functions f∈R¯δ(β), the class of functions involving the Ruscheweyh derivatives operator, we give sharp upper bounds for the Fekete-Szegö functional |a3−μa22|

On the properties of class of pvalent functions defined by Salagean differential operator,

Abstract Salagean [3] defined the operato

Properties of a certain subclass of starlike functions defined by a generalized operator

In this paper, we introduce the class Sα,λ n,s (β), consisting of analytic functions defined by a generalized operator. We derive coefficient inequalities, growth and distortion theorem, extreme points and Fekete-Szegö problem for functions in this class

P A COEFFICIENT BOUNDS FOR A CLASS MULTIVALENT FUNCTION DEFINED BY SALAGEAN OPERATOR

Abstract: The aim of the present paper is to define a subclass of analytic p-valent function in the open unit disk U = {z : |z| < 1} namely S λ p (A, B, b). For the class defined, we obtain the upper bounds for the Fekete Szego functional,|a p+2 − µa 2 p+1 |