27 research outputs found
The Factors Influencing Purchase Intention by Students to Buy Counterfeit Products
No full textSince there are many people in Indonesia that know and buy counterfeit products of CROCS and since this product is famous enough in society, the author wants to know the factors that can influence purchase intention by students to buy counterfeit products. The title of this research is The Factors Influencing Purchase Intention by Students to buy counterfeit products. The purpose of this research is to analyze the effect of brand personality, perceived product attributes, perceived benefits, product involvement and product knowledge toward purchase intention by students to buy counterfeit products. 125 respondents in this research are students of Muhammadiyah University of Surakarta. Technique sampling of research used was convenience sampling. The data in this research have fulfilled the normal distribution. The analysis results brand personality, product involvement and product knowledge were significant and supported while perceived product attributes and perceived benefits were not significant and not supported.
Key words: Brand personality, Perceived product attributes, Perceived benefits, product involvement, Product knowledge and Purchase Intention.
Surakarta, 04 November 2014
Author,
(Riffat Verlila Ponto
Plant mucilage effects on rhizosheath formation
No full textThe formation of rhizosheaths, protective layers encasing plant roots, involves various factors, including mucilage presence. Yet, the specific impact of mucilage concentration on rhizosheath growth remains unexplored.
Hence, I conducted comprehensive experiments to assess rhizosheath formation across varied mucilage concentrations, soil moisture levels, and alternating dry-wet cycles. Using an artificial root system, I investigated (i) the influence of chia seed mucilage concentration on rhizosheath formation in different soils, (ii) a comparison between chia and flax seed mucilage regarding rhizosheath formation, (iii) the impact of diverse chia seed mucilage concentrations on rhizosheath development under different water contents, (iv) the effect of drying and wetting cycles on rhizosheath formation, (v) and evaluated the particle size distribution and stability of rhizosphere soil under dry and wet conditions in the presence of mucilage. Additionally, a novel model was proposed to describe the pore distribution of dry mucilage.
The experiments involved jute cord models as roots placed in sandy loam and quartz sand with varying chia seed mucilage concentrations. Soil was filled into PVC cylinders, artificial roots inserted, and wet mucilage solutions prepared at five concentrations were uniformly applied to simulate mucilage exudation. Soil samples were kept for 48 hours at room temperature, after which rhizosheath development was weighed. Similarly, I explored rhizosheath development under flax seed mucilage concentrations in quartz sandy soil, and, using the same method, studied the effect of chia seed mucilage under different volumetric water contents. Further experiments examined rhizosheath formation with 0.12 g dry mucilage g-1 water in sterilized and unsterilized soils with varying clay contents under dry-wet cycles to 75% of the water holding capacity. I also analysed particle size distribution and stability of rhizosphere soil using laser diffraction and SEM imaging.
Notably, the findings revealed that in dry soil, rhizosheath formation peaked at an intermediate mucilage concentration. This observation aligned with our model, suggesting that extremely low mucilage concentrations lack the molecules required for soil particle adhesion, while highly concentrated gels limit diffusion. Flax seed mucilage showed no significant impact on rhizosheath formation, whereas increasing soil moisture levels up to a certain point enhanced rhizosheath development, doubling with mucilage presence. Additionally, constant wet conditions significantly augmented rhizosheath development, particularly in soils with 22% clay, while drying-wetting cycles reduced rhizosheath formation. Outside the rhizosheath, interactions with particle aggregation exhibited an average size diameter of
Overall, both water and mucilage concentrations drive rhizosheath formation, synergizing within an optimal range observed at 0.12 g mucilage g-1 rhizosphere water. The water regime significantly controls mucilage contribution to rhizosheath formation, while factors like clay content or microbial activity showed minor influences within controlled laboratory conditions
Propose a new Firefly-Fast Learning Network model based Intrusion-Detection System
No full textCurrently, effective Intrusion-detection systems
(IDS) still represent one of the important security tools. However,
hybrid models based on the IDS achieve better results compared
with intrusion detection based on a single algorithm. But even so,
the hybrid models based on traditional algorithms still face
different limitations. This work is focused on providing two main
goals; firstly, analysis based on the main methods and limitations
of the most-recent hybrid model-based on intrusion detection,
secondly, to propose a novel hybrid IDS model called FA-FLN
based on the Firefly algorithm and Fast Learning Network
Fundamental studies of anaerobic biosorption in wastewater treatment
No full textThe potential for sorption of soluble organic matter on anaerobic biomass is currently under investigation by the author and coworkers at Iowa State University. Biosorption is defined as the uptake or accumulation of particulates and chemicals by microbial biomass. The anaerobic biosorption process utilizes the sorption capabilities of active biomass for the treatment of wastewater. Biosorption is a rapid process. About 40% removal of organic matter was obtained in only 15 minutes after the substrate was brought in contact with the biomass;This dissertation presents the results of preliminary investigations on the effects of various factors on the biosorption process. The primary objective of this research was to determine the applicability of anaerobic biomass as a potential sorbent for organic matter and to quantify the results in terms of isotherms. The effects of mixing times, temperature, substrate concentration, biomass concentration, and granular biomass particle size were also studied;Anaerobic biomass was grown at 35°C in 10-liter source reactors, operated as anaerobic sequencing batch reactors (ASBR). Biosorption experiments were performed with active biomass in two liter batch reactors on a synthetic milk waste. The particle size distributions of the granular biomass were determined using an Automatic Image Analysis system. Temperature studies were significant. Better removals were obtained at higher temperature than at lower temperature. It was observed that wastes at temperatures as low as 7°C could be treated without the application of external heat;Higher removals were obtained with the small granular biomass than with the large granules. Increasing the biomass concentration resulted in a significant increase in the percentage removal of organic matter. Another method of improving biosorption was to operate a number of sorption reactors in series. High overall COD removals were obtained in a series of three reactors. The results were expressed in terms of adsorption isotherms. The data conformed well to both the Freundlich and the Langmuir adsorption models.</p
Preliminary Performance Test of a Combined Solar Thermal Roof System with Heat Pump for Buildings
No full textAbstractIn the present study, a novel solar thermal roof collector was developed by primarily exploiting components and techniques widely available on the market and coupled with a commercial heat pump unit. The proposed indirect series solar-assisted heat pump system was experimentally tested and preliminary system performance was investigated. Yet, the analysis based on indoor and outdoor testing predominantly focuses on the solar thermal roof collector. A detailed thermal model was developed to describe the system operation. Also, a computer model was set-up by using Engineering Equation Solver (EES) to carry out the numerical computations of the governing equations. Preliminary analyses show that the difference in water temperature could reach up to 18°C while maximum thermal efficiency found to be 26%. Data processing of the series covering the test period represents that Coefficient Performance of the heat pump (COPHP) and overall system (COPSYS) averages were attained as COPHP=3.01 and COPSYS=2.29, respectively
Performance Analysis of a Combined Building Integrated PV/T Collector with a Liquid Desiccant Enhanced Dew Point Cooler
No full textAbstractThis study introduces a new concept on solar thermal energy driven liquid desiccant based dew point cooling system that integrates several green technologies; including photovoltaic modules, polyethylene heat exchanger loop and a combined liquid desiccant dehumidification-indirect evaporative air conditioning unit. A small scale experimental prototype was developed and tested to investigate the performance of the proposed system and influence of the various parameters such as weather condition, air flow and regeneration temperature. A cost effective, easy-to-make polyethylene heat exchanger loop was employed underneath PV panels for heat generation. In addition, a liquid desiccant enhanced dew point cooling unit was utilized to provide air conditioning through dehumidification of humid air and indirect evaporative cooling. The experimental results show that the proposed tri-generation system is capable of providing about 3kW of heating, 5kW of cooling power and 10 MWh/year power generation, respectively
Students' and Teachers' Perceptions About Hospital Educational Environment In Selected Postgraduate Medical Institutes of Bangladesh
No full textThis descriptive type of cross sectional study was carried out to observe the hospital educational environment of selected postgraduate medical institutes of Bangladesh. Study period was from July 2016 to June 2017.Sample size was 289 postgraduate clinical students of various course (MD, FCPS & Diploma) and 20 clinical teachers of 10 selected postgraduate medical institutes of Bangladesh. Convenience sampling technique was adopted. Data collection was done with self- administered semi-structured questionnaire using Postgraduate Hospital Educational Environment Measurement (PHEEM) inventory and by In-depth interview of teachers. Three subscales of PHEEM are students' perceptions about 'role autonomy', students' perceptions about quality of teaching and students' perceptions about social support. In-depth interview of the clinical teachers was undertaken to explore the training facilities in the selected postgraduate medical institutes of Bangladesh. Study result revealed total PHEEM score was110.08.Mean score of subscales of PHEEM were 34.51, 36.29 and 26.28 for 'role autonomy', quality of teaching and social support respectively. All these values indicates that the students' perception were in the right or positive direction. Analysis of individual items had shown mean score of most of the individual item were 2-3 that indicated the aspects of the climate that could be enhanced. There were few items that had mean score 2 or less than 2 that indicated the problematic areas of hospital educational environment. In-depth interview of the teachers revealed that there was also some problematic issues on postgraduate training facilities like work overload, lack of proper monitoring or supervision of training, inadequate library, internet, ICU and investigation facilities etc. Study recommended that significant attention should be paid in the problematic areas (lack of supervised training, heavy work load of student, lack of library facility etc.) as well as improvement needed on several areas of hospital educational environment of postgraduate medical institutes of Bangladesh.Bangladesh Journal of Medical Education Vol.9(1) 2018: 7-9</jats:p
China’s Belt and Road Initiative: Global Politics and Implications
No full textBelt and Road Initiative (BRI) is a global infrastructure development project that ambitiously aims to connect Asia with European and African continents through land and sea corridors. China adopted this gigantic game-changing master plan in 2013 and spurred much speculation among scholars and policymakers worldwide. This article investigates the development of the project through the lens of global political geography and economy. From an international relations perspective, the author consults relevant pieces of literature and focuses on the international issues and events concerning the development of the project using concepts of ideas, interests, and institutions within the scope of geopolitics and political economy. The analysis is performed by reviewing critical events and arguments related to the ideas, interests and institutions evolving around the implementation of BRI. Drawing from the analysis, the author argues that the rise of China as a dominant global superpower largely depends on the success of the BRI, and this initiative will continue to generate politics among the international actors, multinational entities, and institutions. Despite widespread speculations, the project poses a substantive threat to the USA’s global dominance and is likely to create more global development cooperation under Chinese leadership and vision
Pressure drop of HFC refrigerants inside evaporator and condenser coils as determined by CFD
No full textSmith was a PhD student supervised by Shao and was lead author.
The work enabled the authors to secure, through highly competitive tendering, project (963-TRP) on HVAC Flow Resistance from the American Society of Heating Refrigeration and Air-conditioning Engineers (ASHRAE)
