1,721,143 research outputs found
Genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh and development of propagation methods
No full textThe present study set out to assess genetic diversity of jackfruit (Artocarpus heterophyllus Lam.) in Bangladesh, to selects its superior germplasm, and to develop suitable methods of vegetative and in-vitro propagation.The genetic diversity of jackfruit in Bangladesh was assessed by means of a farmers' participatory survey, a study of morpho-agronomic characteristics and an isozyme study in the laboratory.The superior types were selected on the basis of farmers' preferences. Ten superior types were recommended on the basis of yield per plant, fruiting season, flesh colour, flesh texture and sweetness. Cultivation of superior types may increase the production of quality jackfruit and would also extend the fruiting season in Bangladesh.An attempt was made to develop propagation methods. Air-layering gave 86% rooting success when it was done in the month of November on current year shoots in mature trees of jackfruit. The subsequent growth of the layers in the nursery was found to be good after one years of establishment. The success rate in the nursery after one year was 80%.The methods of grafting in respect of different seasons were standardised using scions from mature trees. Among the methods, veneer grafting in April gave the highest (80%) success. The seasons of grafting could be extended to October with epicotyl grafting and to November by cleft or splice grafting. The subsequent growth and establishment of these grafts were also found satisfactory.In the study of in-vitro methods, 2.0 mg/1 of BAP or 0.5 mg/1 of TDZ were the effective cytokinins for multiple shoot regeneration. GA3 or Kinetin did not produce multiple shoots on a large scale. The regenerated shoots were rooted using IBA at concentrations of 2.0 to 2.5 mg/1 in in vitro culture. The in-vitro plantlets were established in the nursery. The success rate of establishment was 81-88%. The protocol for hardening and establishment of in-vitro derived plantlets in the nursery was developed for a higher success rate.</p
Advance strategies for tar elimination from biomass gasification techniques
No full textTar is an unwanted complex organic compound that has a molecular weight higher than benzene. Usually, tar is produced during gasification process during the pyrolysis stage of carbonaceous materials. Higher concentrations of tar in produced gas can cause choking and damage to the downstream equipment. The operation parameters of gasification are affected by the formation of tar. There are two main methods for tar rejection from the gaseous stream: mechanical and chemical tar reforming using catalysts. Both methods have pros and cons, in mechanical tar removal, however, the tar is only physically removed or separated from the gas, while in the catalytic tar reforming process, tar content reduces along with the gaseous stream, thus enhancing the quality of fuel gas. In conclusion, the catalytic tar reforming is more effective, while the implementation of catalysts in the gasification process on large-scale faces economic challenges
Advances in clean energy technologies
No full textAzad, M ORCiD: 0000-0001-8258-6057Advances in Clean Energy Technologies presents the latest advanced approaches toward a cleaner and more sustainable energy environment. Editor Kalam Azad and his team of expert contributors focus on recent developments in the field of clean energy technologies, sustainable zero emission resources, energy efficiency and environmental sustainability, as well as clean energy policy and markets. This well-rounded reference includes an authoritative view on control and storage solutions specific to medium and large-scale industries, advanced approaches to modeling, and experimental investigations on clean energy technologies.
Those working in and researching clean energy and sustainability will obtain detailed understanding of a variety of zero emission energy production and conversion approaches, as well as important socio-economic and environmental considerations that can be applied to their own unique power generation settings.
Key Features
Presents an exclusive analysis on advanced approaches of modeling and experimental investigations of clean energy technologies, including solar, wind, ocean, and hybrid systems
Includes an authoritative and cross-disciplinary view on energy policy and energy markets
Helps readers develop an understanding of concepts and solutions to global issues surrounding sustainability in medium-large scale energy industries
Offers detailed understanding of a variety of zero emission energy production and conversion approache
Development: Where Do We Stand?
Full text linkBangladesh has achieved the status of a 'lower middle-income' country 44 years after emerging as a sovereign state. Along the way, it achieved some successes in improving several development indicators such as life expectancy, primary school enrolment, infant mortality rate, maternal mortality, etc. But how remarkable are these achievements in relation to the attainments of other countries
Determinants of Asian Democratisation (1981-2005)
No full textAs a culturally distinctive region, Asia was chosen as the sample for this study. This empirical study investigated what the major trends of democratisation were in Asia between 1981 and 2005: why some countries became democratic while other countries failed to follow suit during that period. The main research hypothesis was: “That is it was mainly economic development that drove democratisation in Asia between 1981 and 2005”. Although some studies have studied the impact of economic development on democratisation in Asia, their findings have been inconclusive and focuses sometimes different. [To investigate the research hypothesis, 24 Asian countries were selected…measurement tools used etc…] For this research work, statistical and case study methods were applied. The data used in the analyses were collected from established data sources e.g. Freedom House (Freedom in the World, n.d.) and United Nations Statistics Division (UN Stat, n.d.). Repeated Measures in Linear Mixed Modeling (LMM) were used to analyse the quantitative data. Three case studies supplemented the findings of statistical analyses. Historical information and institutional and legal facts were also used in the case studies. This study found that increases in the level of economic development along with its equitable distribution in society and positive roles of political actors increase the level of democratisation in Asia. Some pro-democratic political and social institutions, such as tradition of parliamentarianism, and international organisations, for example Bretton wood institutions, also led to democratisation. A low extent of national political divide was found to result in a considerably high level of democratisation in a country where confrontation between major political forces is the main feature of politics. This study also found that a partial democracy with Asian values, economic legitimacy, a lack of corruption and a “systematic control” over opposition politicians can survive, and is not prone to higher level of democratisation. The Taiwan case revealed that, amongst other factors, the role of political actors and economic equity along with economic development is also vital for democratisation. The Singapore case explained how a “hybrid regime” in a rich country outsmarts democratisation. The study of Bangladesh provides an idea about other elements, e.g. lower level of political confrontation, that push for higher levels of democratisation
Effect of lignin-rich Vitex negundo leaf extract on antioxidant, thrombolytic, antiproliferative, antidepressant, and cytotoxic activities in mice
No full textIn several counties, Vitex negundo have been claimed to have anti-inflammatory, analgesic, and antioxidant activities. It's frequently used in folk medicine for the treatment of various pain disorders. The methanol extract of Vitex negundo leaves was studied for its biological effects. To investigate different biological exertions of the methanol extract of Vitex negundo, the leaf extracts were obtained with pure methanol. In-vitro anti-oxidant activity was resolved using a DPPH radical scavenging assay. A clot lysis test was used to assess the thrombolytic activity. Antiproliferative effects of DMSO Vitex negundo in cell lines acquired from human cervix adenocarcinoma (HeLa cells). Using the brine shrimp lethality bioassay method, the plant extracts were evaluated for cytotoxic action. LC50 values were determined through probit analysis of mortality percentages. In hole cross-test and open-field test, neuropharmacological activities of mice were assessed in mice. The findings revealed that Vitex negundo leaf extract possessed antioxidant effects, streptokinase exposed significant clot lysis and human cervix adenocarcinoma cells demonstrated mild cervical antiproliferative activity. Significant neuropharmacological action (antidepressant and anxiolytic) and cytotoxic action were shown by the methanol extract of Vitex negundo leaves
Synthesis, Structure, and Magnetic Properties of Double Perovskites of the type A2MnBO6 and A2FeBO6; (A=Ca, Sr, Ba, La; B=W, Mo, Cr
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Cash flow management and raw material purchase process of ACI Ltd
Full text linkThis internship report is submitted in a partial fulfillment of the requirements for the degree of Bachelor of Business Administration,2012.Cataloged from PDF version of Internship report.Includes bibliographical references (page 39).Abul Kalam AzadB. Business Administratio
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