1,720,978 research outputs found
PHEROMONE USE FOR INSECT CONTROL: PRESENT STATUS AND PROSPECT IN BANGLADESH
Get PDFThe insect’s world is filled with many odors. Insects use these odors to cue them in a variety of complex social behaviors, including courtship, mating, and egg laying. Scientists and pest control specialists have known about these complex communication systems for decades. The main aim of this study was to visualize the availability, trends and differences in the sources of pheromone control in agricultural growth of Bangladesh. It also concerned on constrains and present use of pheromone and their possible recommendation on behalf of Bangladesh agriculture. It concentrated on the data during last three decades (1980-2010), comprising status of pheromone use in Bangladesh agriculture and its future. Review revealed that Bangladesh has been enormously successful in increasing pheromone use in agricultural production (especially for vegetables). Understanding of the nature of pheromones and their potential for pest control along with the future prospective of pheromone technique in agriculture were stated. Since the pheromone, technologies for control of major crop pests in Bangladesh are still limited. So that this review emphasized on more attention to the authority to increase the research works and project facilities related to develop and promote pheromone techniques. It is highly recommended to increase availability of pheromone in market, more investment in research and development, introduction of newly identified pheromone for specific pest, to assist government and nongovernment organizations to work with farmers to reduce harmful insecticide use and promote pheromone tactics as one part of integrated crop management (ICM)
Secure data sharing in cloud and IoT by leveraging attribute-based encryption and blockchain
Get PDF“Data sharing is very important to enable different types of cloud and IoT-based services. For example, organizations migrate their data to the cloud and share it with employees and customers in order to enjoy better fault-tolerance, high-availability, and scalability offered by the cloud. Wearable devices such as smart watch share user’s activity, location, and health data (e.g., heart rate, ECG) with the service provider for smart analytic. However, data can be sensitive, and the cloud and IoT service providers cannot be fully trusted with maintaining the security, privacy, and confidentiality of the data. Hence, new schemes and protocols are required to enable secure data sharing in the cloud and IoT. This work outlines our research contribution towards secure data sharing in the cloud and IoT. For secure data sharing in the cloud, this work proposes several novel attribute-based encryption schemes. The core contributions to this end are efficient revocation, prevention of collusion attacks, and multi-group support. On the other hand, for secure data sharing in IoT, a permissioned blockchain-based access control system has been proposed. The system can be used to enforce fine-grained access control on IoT data where the access control decision is made by the blockchain-based on the consensus of the participating nodes”--Abstract, page iv
"Smart oppløsning mellom handelspartnere til SMB i Bangladesh: Tilnærming til fakturafinansiering som et middel for smart forsyningskjedefinansiering". : En kvalitativ studie i konteksten av Bangladesh.
No full textMaster of Science in Business (Siviløkonom) - Nord universitet 202
Μελέτη της προσρόφησης και εκρόφησης επιλεχθέντων φυτοφαρμάκων και μιας τυπικής χρωστικής σε εδαφικά συστήματα και απομάκρυνση των υπολειμμάτων τους με υψηλού κόστους (ενεργός άνθρακας) και χαμηλού κόστους υλικά, με τη χρήση στατιστικής μεθοδολογίας επιφανειών απόκρισης
No full textThe adsorption-desorption study of bromophos methyl [O, O- dimethyl – O - (2, 5 dichloro-4 bromophenyl) phosphorothioate], quinalphos [O, O-diethyl O-2-quinoxalinylphosphorothioate], pretilachlor [2- chloro-2’,6’-diethyl-N-(2-propoxyethyl)-acetanilide]and a typical dye congo red (CR) [Dinatirum-3, 3 ¢-[[1, 1 ¢-biphenyl]-4, 4¢-diylbis (azo)] bis(4-aminonaphthalin-1-sulfonat) on five soils from different Greek locations with varying physical and chemical properties were studied by batch equilibration method. Adsorption isotherms fitted well to the Freundlich equation than Langmuir isotherm equation for all compounds. Regression analysis between Freundlich adsorption coefficient (Kfads) andvarious soil properties indicated that soil organic matter content plays a controlling role inthe adsorption of these pesticides on the soils. But on the other hand, clay content plays animportant role for congo red adsorption. Desorption isotherms also conformed well to theFreundlich equation and there was a hysteresis effect in all the soils. The Freundlich Kfdesvalues were higher for the soils with the highest organic matter percent for studiedpesticides and for CR the highest Freundlich Kfdes was observed for the soils with thehighest clay contentPesticides are being applied to agricultural lands all over the world for increased cropproduction as well as for greater yield in order to meet the demand of world increasingpopulation. However, at present, misapplication, carelessly disposal or storage of emptypesticides and containers into the environment is a major source of drinking watercontamination in all over the world. As consequences, the accumulation of pesticides infood and drinking water has been generally recognized as dangerous, and the long-termpersistence and toxicity of pesticides in groundwater is potentially responsible for causingvarious kinds of human diseases. In the same way, synthetic dyes are indispensable to thetextile and dyeing industries. Textile and yarn dyeing industries are discharging theiruntreated waste water into the natural streams. So, the surface water body is nowvulnerable, aquatic life is endangered and users are facing serious health problems due tocontamination by hazardous chemicals from those industries. So it is an urgent need tosearch low-cost materials and efficient methodology for the removal of these pesticidesand dye effluents from the waste water. Adsorption is the most widely used methodologysince the beginning of this century for the treatment of these hazardous substances fromaqueous matrices.This PhD study tried to removal of above mentioned hazardous compounds fromaqueous solution onto different adsorbents from diverse origin. The adsorbents used in thepresent study were used tea leaves (UTL), Neem leaf powder (NLP) and saw dusts (SD) aslow cost materials; as well as activated carbon produced from olive seed (OSACs), ricehusk (RHACs) and sugarcane bagasse (BAGACs) used as high cost materials. At first,kinetic studied were performed for all adsorbents in order find equilibrium contact timeand describe the kinetic models. An approach of statistical design of experiments based onresponse surface methodology (RSM) was used to develop response model and desirabilityfunction was then used for simultaneous optimization of all affecting parameters in orderto achieve the highest removal% of all compounds. Finally, removal capacities of alladsorbents were determined by developing isotherms, considering all optimized factors.The results indicated that all adsorbents followed either Langmuir isotherm model orFreundlich model and the kinetic study showed all data for all adsorbents fitted by pseudosecondorder kinetic model. All the low cost materials used in this study are locallyavailable as well as economically feasible and there have no alternative use, moreover,proposed adsorbents do not require any pretreatments but showed high removal capacity incompared to activated carbons. The developed model using RSM can be providing afurther insight for potential use of other processes, especially industrial water treatmentsystem
Structural Configuration of Amorphous Silica Surface with Different Terminating Groups Using Classical and Ab Initio Molecular Dynamics
No full textSilica has numerous applications across various sectors of technology, including concrete production, glass production, food additives, and semiconductor technology. The surface interaction properties of amorphous silica are crucial, yet many aspects of these interactions, particularly with passivating groups, are still not fully understood because amorphous silica’s nature is non-periodic. In this study, computational simulations are used to understand the bonding mechanism and atomic structure of the amorphous silica surfaces with different passivating groups. Amorphous silica surfaces are generated by melt-quench dynamics using classical molecular dynamics (MD). Then, subdomains of these surfaces containing an undercoordinated surface atom are selected for ab initio density functional theory calculations. Relaxed surface geometries including hydroxyl, methyl, and fluoromethyl passivating groups are determined from DFT-based structural relaxation calculations, along with Born-Oppenheimer MD at 300 K to determine the bond dissociation energy, bond length, and angle. This study provides a deeper understanding of the interactions between silica surfaces and this information can be used to improve the production and processing of silica-based materials, leading to improved product quality, reduced costs, and increased efficiency. Additionally, this research can provide a foundation for future studies on the surface interactions of amorphous silica, leading to further advances in this field
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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