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Publication Title : Homologous 1,3,5-triarylpyrazolines: synthesis, CH--pi interactions guided self-assembly and effect of alkyloxy chain length on DNA binding properties
Author : Associate Prof. Dr. Lo Kong Mun
Publisher URL : www.rsc.org/njc

Publication Abstract:
-A series of new 2-pyrazoline derivatives (1cā€“12c) bearing one to twelve carbon homologous alkyloxy side chains have been synthesized in good to excellent yields via intramolecular cyclization reaction on treatment of chalcone intermediates (1aā€“12a) with phenyl hydrazine (1b) and characterized on the basis of their physical and spectral (IR, 1H & 13C NMR, GC-MS) data. The solid state structure of compound (2c) showed intriguing and unique 1D-supramolecular zigzag chain-like self-assembled structure, the driving force of which is only CH  p interactions. DNA interaction studies have also been carried out on selected compounds 1c, 3c, 5c, 6c, 9c and 12c of the series by UV-visible spectroscopy to evaluate their anticancer potential and the effect of alkyloxy chain length on DNA binding property. All the tested compounds showed strong DNA binding (105ā€“106 M1 binding constants) with hyperchromic effect. A slight increase in the DNA binding strength, observed on increasing the chain length of alkyloxy groups, was attributed to their conformational arrangements, leading to the best fit conformation of 1,3,5-triaryl moiety in the minor groove of DNA structure.




Publication Title : Highly Oriented Vertically Aligned Carbon Nanotubes via Chemical Vapor Deposition for Key Potential Application in CNT Ropes
Author : Dr. Samira Bagheri
Publisher URL : - none -

Publication Abstract:
The remarkable properties of highly oriented vertically aligned carbon nanotubes (CNTs) make them attractive for electrical applications, especially for CNT ropes. In this paper, we describe the process to grow long oriented CNT arrays to improve the electrical properties of the devices based on CNTs. Chemical vapour deposition was used to deposit highly oriented CNTs using camphor oil as a carbon source and argon and hydrogen gas as carrier gases to grow perpendicular CNTs on the surface of the silicon substrate in presence of ferrocene as a metallic catalyst. Images obtained by field emission SEM indicate the formation mechanism of oriented CNTs with high morphological purity of nanotubes, which depends significantly on the deposition time and applied temperature to the furnaces. The TEM images confirm synthesis of multiwall CNTs (MWCNTs). This method might be an effective method of producing highly oriented MWCNTs in different aspect ratios.




Publication Title : Effects of Engineered Nanomaterials on Plants Growth: An Overview
Author : Dr. Samira Bagheri
Publisher URL : - none -

Publication Abstract:
Rapid development and wide applications of nanotechnology brought about a significant increment on the number of engineered nanomaterials (ENs) inevitably entering our living system. Plants comprise of a very important living component of the terrestrial ecosystem. Studies on the influence of engineered nanomaterials (carbon and metal/metal oxides based) on plant growth indicated that in the excess content, engineered nanomaterials influences seed germination. It assessed the shoot-to-root ratio and the growth of the seedlings. From the toxicological studies to date, certain types of engineered nanomaterials can be toxic once they are not bound to a substrate or if they are freely circulating in living systems. It is assumed that the different types of engineered nanomaterials affect the different routes, behavior, and the capability of the plants. Furthermore, different, or even opposing conclusions, have been drawn from most studies on the interactions between engineered nanomaterials with plants. Therefore, this paper comprehensively reviews the studies on the different types of engineered nanomaterials and their interactions with different plant species, including the phytotoxicity, uptakes, and translocation of engineered nanomaterials by the plant at the whole plant and cellular level.




Publication Title : Prediction Cost Maintenance Model of Office Building Based on Condition-Based Maintenance
Author : Associate Prof. Dr. Faizah Binti Ahmad
Prof. Dr.Sr Azlan Shah Bin Ali
Dr. Au Yong Cheong Peng
Publisher URL : http://www.ein.org.pl/

Publication Abstract:
Building maintenance costs are continuously increasing as a result of poor maintenance. Consequently, there is an urgent need to develop solutions to reduce the maintenance costs. Various studies demonstrated that the characteristics of condition-based maintenance are directly related to the cost performance. Thus, this paper seeks to establish the relationships between the characteristics of condition-based maintenance and the cost performance. The researcher then developed a regression model for maintenance planning and prediction. The study adopted a mix method approach that includes questionnaire survey, interview, and case study. The findings highlighted the reliability of maintenance data and information as the most significant characteristic of condition-based maintenance. Consequently, the study concluded that the planning and the application of the condition-based maintenance strategy should consider its significant characteristics and make reference to the resulting prediction model. Furthermore, the study recommended measures to improve the significant characteristics and the cost performance in practice.




Publication Title : Participative Mechanisms to Improve Office Maintenance Performance and Customers' Satisfaction
Author : Associate Prof. Dr. Faizah Binti Ahmad
Prof. Dr.Sr Azlan Shah Bin Ali
Dr. Au Yong Cheong Peng
Publisher URL : http://ascelibrary.org/doi/abs/10.1061/(ASCE)CF.1943-5509.0000609

Publication Abstract:
Buildings can be poorly maintained due to lack of understanding towards the role of building maintenance in achieving organisation's objective and long-term profitability. The maintenance management is the agent that provides maintenance services to fulfil the needs of the organisation. However, involvement of all the key participants is the key to enhance maintenance planning, execution, and outcome. Whereby, participative mechanism involves the key participants to deal with the maintenance issues. Thus, this paper seeks to identify the participative mechanisms through literature review; then, establish relationship between the mechanisms and maintenance performance through questionnaire survey and interview; and finally produce a regression model for prediction purpose. The findings reveal that effective communication among the key participants is vital to enhance the maintenance performance. Therefore, this paper recommends that the management should develop an effective communication platform involving all key participants with contribution and commitment toward the maintenance activities.






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