Predicting annual stem diameter increment of selected tree species in Sinharaja rain forest by considering tree and stand level effects

Information on the diameter increment of tree species is important for developing a sustainable forest harvesting plan and for reforestation. Fitting a forest growth model for diameter increment can be utilized to get the information. The objective of this study was to develop a predictive model for the annual diameter increment of a multispecies stand in the Sinharaja Rain Forest in Sri Lanka. To fulfill this objective, four linear mixedeffect models were fitted to predict the annual diameter at breast height (dbh) increment of trees by using dbh, the natural logarithm of dbh, and species as a random effect. The model that contained random coefficients for the intercept term, dbh and log (dbh) were selected as the best-fitted model based on the Akaike Information Criterion (AIC) value and the likelihood ratio test. Then, the bestfitted model was expanded by adding other subsequent variables that describe the effects of competition from surrounding trees, and a size structure component, which is the maximum dbh. The final model comprised of this information dbh, log(dbh), stocking density, maximum dbh, and competition from trees smaller than the subject tree. Using the best-fitted final model, the annual dbh increment of the 10 selected abundant species was calculated. It was noted that all the selected species have growth rates that increase rapidly at the initial stage, and then reach its unique maximum growth rate. These increment patterns reflected that different species followed different annual dbh increment patterns. Therefore, this final model can be consolidated into an effective empirical model to project the future growth of a tropical rainforest

Customer Behavior Analysis for Social Media

It is essential for a business organization to get the customer feedback in order to grow as a company. Business organizations are collecting customer feedback using various methods. But the question is ‘are they efficient and effective?' In the current context, there is more of a customer oriented market and all the business organizations are competing to achieve customer delight through their products and services. Social Media plays a huge role in one's life. Customers tend to reveal their true opinion about certain brands on social media rather than giving routine feedback to the producers or sellers. Because of this reason, it is identified that social media can be used as a tool to analyze customer behavior. If relevant data can be gathered from the customers' social media feeds and if these data are analyzed properly, a clear idea to the companies what customers really think about their brand can be provided

Contribution of dissolved sulfates and sulfites in hydrogen sulfide emission from stagnant water bodies in Sri Lanka

Abstract Accumulation of sulfur-containing compounds and their bacterial mediated reductions have led to the emission of pungent odors from stagnant water bodies. This study is focused on the contribution of inorganic sulfur compounds in the emission of hydrogen sulfide. The measured dissolved oxygen levels have demonstrated good negative correlations with the dissolved sulfide levels implying the oxygen deficiency is the key for the reduction of sulfate ion and sulfite ion to sulfide ion. Particularly, the dissolved molar fractions of sulfide from the total dissolved sulfur compounds (sulfates, sulfites and sulfides) have a very good correlation with the dissolved oxygen for the stagnant water bodies except the artificially aerated prawn farms. For the stagnant water bodies with significant correlations, linear regressions are reported for them to be utilized in estimating one component of the regression from the measurement of the other. The measured data were further utilized to estimate the levels of hydrogen sulfide gas. The pH of the water bodies has confined much of the dissolved sulfides in the form of bisulfide ion and they can be easily escaped to the atmosphere upon acidification due to industrial discharges and/or acidic precipitations. The estimated levels of hydrogen sulfide just above the water surface were plotted for the most polluted stagnant water body in Sri Lanka for the pH range of 5-10 and temperature range of 25-35°C

A preliminary study on occurrence and characterization of extended spectrum beta lactamase producing extra intestinal pathogenic <em>Escherichia coli</em> isolated from dogs

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Impact of Compliance with Principles on Board of Directors and Corporate Performance: Empirical Evidence from Sri Lankan Listed Companies

Board of directors in corporate governance is conceptualized as the perceived ability of a firm to constrain and direct corporate power so that it efficiently creates economic value and equitably distributes economic wealth. Accordingly, this study examines the relationship between the level of compliance with the principles on corporate governance related to the board of directors and corporate performance of listed firms in Sri Lanka using secondary data related to 133 listed companies from 2009 to 2016. This study constructed Board Index related to dimensions (principles): Chairmanship, Nomination Committee, Audit Committee, Remuneration Committee, and Re-election of directors, Company Secretary, Role of the Board, Board Meetings and Board Independence. This study employs panel regression model to examine the relationship between the Board Index (BI) and their relationship with corporate performance and performed with Hausman test for random and fixed effects. The findings indicated that the compliance with these principles are positively related to the financial performance and negatively related with market performance. Thus, this study provides empirical support for the agency perspective in the context of compliance requirements of board of directors leading to higher corporate performance. Insights of this research are offered to listed firms by the compliance of corporate governance principles have the potential to improve company performance. KEYWORDS: Agency Perspective, Audit Committee, Corporate Governance, Nomination committee, Remuneration Committee