Silika Daripada Sekam Padi Melalui Pengekstrakkan Pelarut Dan Kaedah Sol Gel

Kajian ini menunjukkan silika boleh diekstrak dari sekam padi dengan menggunakan kaedah pengekstrakkan pelarut. Takat optimum kemolaran natrium hidroksida ialah 1 M. Pada mulanya juga menunjukkan jisim silika yang diperolehi adalah lebih daripada 1.00 g bagi setiap 10.0 g sekam padi disebabkan oleh penggunaan radas berkaca Selain itu, asid nitrik dan kloroform didapati tidak sesuai digunakan sebagai agen peluntur dalam kajian in

Antagonistic Managers, Careless Workers and Extraverted Salespeople: An Examination of Personality in Occupational Choice

This paper is an econometric investigation of the choice of individuals between a number of occupation groupings utilising an extensive array of conditioning variables measuring a variety of aspects of individual heterogeneity. Whilst the model contains the main theory of occupational choice, human capital theory, it also tests dynasty hysteresis through parental status variables. The focus is an examination of the relationship between choice and personality with the inclusion of psychometrically derived personality variables. Occupational choice is modelled using multinomial logit estimation using the Household Income and Labour Dynamics in Australia (HILDA) survey data. Human capital variables are found to exhibit strong credentialism effects. Parental status has a small and limited effect on occupation outcomes indicative of only some small dynasty hysteresis. On the other hand, personality effects are found to be significant, relatively large and persistent across all occupations. Further, the strength of these personality effects are such that they can in many instances rival that of various education credentials. These personality effects include but are not limited to: managers being less agreeable and more antagonistic; labourers being less conscientiousness; and sales people being more extraverted.occupational choice, personality traits, credentialism, dynasty hysteresis

Occupational Choice: Personality Matters

In modern societies, people are often classified as "White Collar" or "Blue Collar" workers: that classification not only informs social scientists about the kind of work that they do, but also about their social standing, their social interests, their family ties, and their approach to life in general. This analysis will examine the effect of an individual's psychometrically derived personality traits and status of their parents on the probability of attaining a white collar occupation over the baseline category of a blue collar occupation; controlling for human capital and other factors. The paper uses data from the Household Income and Labour Dynamics in Australia (HILDA) survey to estimate a random effects probit model to capture the effects on the probability of being in a white collar occupation. The results are then examined using the average marginal effects of the different conditioning variables over the whole sample. The analysis confirms the previous findings of human capital theory, but finds that personality and parental status also have significant effects on occupational outcomes. The results suggest that the magnitude of the average marginal effect of parental status is small and the effect of the personality trait "conscientiousness" is large and rivals that of education. Finally, estimates of separate models for males and females indicate that effects differ between the genders for key variables, with personality traits in females having a relatively larger effect on their occupational outcomes due to the diminished effects of education.occupational choice, personality, human capital, dynasty hysteresis

TRANSACTION COSTS AND FISHERIES CO-MANAGEMENT

Fisheries co-management as an alternative to centralized command and control fisheries management is often suggested as a solution to the problems of fisheries resource use conflicts and overexploitation. This paper highlights some elements of the transaction costs under a fisheries co-management system. The transaction costs can be categorized into three major cost items: (i) information costs, (ii) collective fisheries decision-making costs, and (iii) collective operational costs. An approach to measuring transaction costs of fisheries co-management systems both in static and dynamic processes is also proposed. There is a need to empirically evaluate the nature of the transaction costs involved in fisheries co-management institutions as a basis for evaluating the efficiency or net benefits of co-managed fisheries compared to centrally managed fisheries.Resource /Energy Economics and Policy,

The curious effects of integrating bimetallic active centres within nanoporous architectures for acid-catalysed transformations

The resourceful combination of distinct Mg, Zn and Si active-sites within a single aluminophosphate framework, via simultaneous isomorphous substitution, has afforded unique bimetallic nanoporous heterogeneous catalysts. Unique site-specific interactions have been engineered, at the molecular level, to facilitate catalytic modifications and optimize product yield. By the dextrous incorporation of individual transition-metal active centres, we are able to intricately control the precise nature of the Brønsted acid sites, thereby influencing their catalytic behaviour for the industrially relevant acid-catalysed Beckmann rearrangement of cyclohexanone oxime and isopropylation of benzene