96 research outputs found
Nondestructive evaluation of residual stresses in nanostructured coatings by synchotron radiation:
No full textThis thesis presents a strain mapping in nanostructure Al2O3/TiO2 ceramic coatings on metallic Titanium substrates by synchrotron radiation. The mapping is obtained under various boundary conditions (tension/compression loads, four-point bending, etc.) and is accomplished using high energy (deeply penetrating) synchrotron white radiation with photon energies up to 200 keV to perform high precision x-ray diffraction on small volumes (1 µm to a few cm), which are then integrated into high resolution 3D maps of the strain fields. Strain mapping in conventional micro-size ceramic coatings are performed for comparison. The underlining structural and functional parameters in processing of these coatings, which result in dramatic improvements in their performance, are discussed. The thesis also presents mechanical properties such as elastic modulus, yield strength, etc., which are deduced from energy dispersive X-ray diffraction (EDXRD) strain mapping in conjunction with modeling.M.S.Includes bibliographical referencesby Nazia Ikram Ahmed
Microbial Remediation of Pesticide Polluted Soils
No full textThe increasingly rapid growth of both, population- and food demands has driven a research race in food production efficiency through the last century, which has made the pesticide use seemingly unavoidable. However, many pesticides are very persistent and tend to accumulate in the ecosystem, often threatening biodiversity and public health. Although abiotic degradation of these compounds plays a role in many cases, the biodegradation of pesticides by microorganisms is usually the most important and dominant process. This natural degradation varies from site to site, depending on several factors, but it can be favourably improved by applying techniques such as bioaugmentation and biostimulation, which can lead to the cleaning-up of pesticide-contaminated soils. The present chapter introduces the most recent findings in the field of bioremediation of pesticides, critically discussing the main bottlenecks and how to overcome them. Factors affecting biodegradation of pesticide-polluted soils are presented, with a clear focus on the enrichment and selection strategies for relevant microbial strains. Case studies on bioaugmentation of contaminated soils and future trends are also described, including the microbial degradation of pesticide mixtures through mixed culture technology.<br/
Microbial Degradation of Plastics:New Plastic Degraders, Mixed Cultures and Engineering Strategies.
No full textPlastic and plastic recycling/degradation has been in the spotlight during last decade, due to its increasing waste accumulation in all world’s ecosystems and the huge challenge deriving from micro-plastic pollution. Therefore, different strategies are under investigation, trying to cope with this problem. Although depolymerisation of plastics by chemico-physical methods seems to represent a promising technology, biodegradation by microorganisms has been raising interest in recent years. In fact, new studies regarding the possibility of engineering specific plastic-degrading enzymes have obtained much attention by the media, due to the hope of overcoming one of the main bottlenecks of this technology: the extremely slow conversion rates. In the following chapter, we will be discussing two important strategies, which are expected to help overcoming these bottlenecks: genetic engineering to improve the catalytic activity of plastic-degrading enzymes and the development of syntrophism and cross-feeding mechanisms in enriched microbial communities. Finally, the potential of ongoing studies and future trends will also be discussed
ANALISIS PENDAYAGUNAAN ZAKAT PRODUKTIF DALAM PENINGKATAN PENDAPATAN MUSTAHIK MELALUI PROGRAM BANGKIT USAHA MANDIRI SUKABUMI (BUMI) (Studi Kasus pada Badan Amil Zakat Nasional Kabupaten Sukabumi)
No full textNazia Nadia Muzdalifah (1530611040). Muhammadiyah University of Sukabumi. Analysis of Productive Zakat Utilization in Mustahik Revenue Increase Through the Sukabumi (BUMI) Mandiri Business Revival Program at the Sukabumi Regency National Amil Zakat Agency. (Sulaeman, S.E., M.Si and Tina Kartini, S.E., M.E.Sy).
This study aims to determine how the utilization of productive zakat through the Sukabumi Mandiri Business Empowerment program conducted by the Sukabumi Regency National Amil Zakat Agency in increasing mustahik income.
This study uses a descriptive method with a qualitative approach. The author performs data collection techniques through interviews, documentation, and observation. Processing data by means of descriptive analysis, namely a technical writing by describing all data obtained through interviews, documentation, and library materials and analyzing it with written sources. The results of this study indicate that the Sukabumi District National Amil Zakat Agency distributes and utilizes ZIS funds by creating community empowerment programs. Sukabumi's Independent Business Rising Program has been effective, as evidenced by the achievement of the objectives of the program, namely for the welfare of the community, increasing income from mustahik, and improving social and religious aspects
SECURITY MEASUREMENT FOR LTE/SAE NETWORK DURING SINGLE RADIO VOICE CALL CONTINUITY (SRVCC).
No full textVoice has significant place in mobile communication networks. Though data applications have extensively gained in importance over the years but voice is still a
major source of revenue for mobile operators. It is obvious that voice will remain an important application even in the era of Long Term Evolution (LTE). Basically LTE is an all-IP data-only transport technology using packet switching. Therefore, it introduces challenges to satisfy quality of service expectations for circuit-switched mobile telephony and SMS for LTE capable smartphones, while being served on the LTE network. Since 2013, mobile operators have been busy deploying Voice Over LTE (VoLTE). They are relying on a VoLTE technology called Single Radio Voice Call Continuity (SRVCC) for seamless handover between packet-switch domain to circuit-switch domain or vice versa. The aim of thesis is to review and identify the security measurement during SRVCC and verify test data for ciphering and integrity algorithm.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format
Towards automatic configuration of access control
No full textAccess control provide means to implement organizational security policies to both of its physical and electronic resources. To date, several access control mechanisms, including Role Based Access Control (RBAC) and Discretionary Access Control (DAC) have been proposed. Regardless of which security mechanism an organization adopts, once the system variables such as policies, roles, and authorizations are defined, continuous configuration management of these systems become necessary in order to ensure that the behavior of implemented system matches with the expected system behavior. In recent years, configuration errors in access control system have emerged as one of the key causes of system failure. Traditional access control system lacks the ability to anticipate potential configuration errors. Therefore, these systems fail to gracefully react to this problem. Configuration errors often occur either in the form of false positive or false negative authorizations. It is not trivial to manually identify such misconfigurations, and moreover, existingmethods of analyzing system configuration are not efficient in detectingmisconfigurations. Therefore, there is an acute need of better ways for automatic configuration of access control systems. This dissertation aims at developing efficient and automatic methodologies and tools for access control configuration management that are based on data mining technologies. Specifically, it addresses the following three research issues. The first research problem is based on using risk estimates for configuration management. There exist a number of situations in which specific user permission assignments based on the security policy cannot be a priori decidable. These may include emergency and disaster management situations where access to critical information is expected because of the need to share, and in some cases, because of the responsibility to provide information. This dissertation has proposed novel methodologies for dynamic computation of risk in such situations where preventing an access to a resource has more deleterious effect than granting it, if the underlying risk is low. Moreover, it has developed a model that facilitates risk-based access control in both DAC and RBAC cases. Also, in case of RBAC, it has developed a method to determine situational role for a user. Computational experiments performed on both synthetic and benchmark real datasets, even in the presence of noise, confirms the viability of the proposed approaches. The second issue is to investigate the configuration management problems that arise as a result of changes within a system or due to requests from users from collaborating organizations that do not have explicit access to resources. This dissertation has proposed to exploit attribute semantics of users to (semi)automate security configuration and management, and has proposed a methodology to derive credential requirements for roles having permission to access requested object, based on local access control policies using existing access control data. The proposed approach is based on well-known data mining method known as classification. Experimental evaluation shows that the proposed method has outperformed the previously proposed approach to address this problem. Finally, the third research issue deals with automating the process of identifying and removing misconfigurations in RBAC and DAC. Towards this end, this dissertation has proposed approaches to automate the process of detection of exceptionally or erroneously granted or denied authorizations in access control data. These approaches are based on using multiple classifiers to identify anomalous assignments. An extensive experimental evaluation has been performed to demonstrate the accuracy and performance of the proposed approaches.Ph.D.Includes bibliographical referencesby Nazia Bada
Polyhydroxyalkanoates (PHA) production in bacterial co-culture using glucose and volatile fatty acids as carbon source
No full textAliphatic Biopolymers as a Sustainable Green Alternative to Traditional Petrochemical-Based Plastics
No full textIsolation of biosurfactant producing bacteria from Potwar oil fields: Effect of non-fossil fuel based carbon sources
No full textBiosurfactants are surface-active metabolites produced by microorganisms. Biosurfactants tend to solubilize hydrocarbons in the surrounding environment, by reducing surface tension and increasing carbon uptake. In this study, isolation of biosurfactant producing bacteria and effect of renewable, non-fossil fuel based carbon sources on production were assessed. Oil field produced water was collected from Potwar oil fields and thirteen strains were isolated. Strains were screened for biosurfactant production by hemolysis test, emulsification index test, emulsification assay, oil displacement test, drop collapse test, tilted glass slide test and oil coated agar emulsification test. Strains were further screened for maximum production on cost effective renewable carbon source e.g. glucose, waste glycerol and animal fat. Promising strains were identified as Bacillus subtilis (MH142143), Pseudomonas aeruginosa (MH142144), Bacillus tequilensis (MH142145) and Bacillus safensis (MH142146) by 16S rRNA gene sequencing. Among all isolates, highest biosurfactant production on glucose (37%), glycerol (48%) and animal fat oil (49%), after 24 h cultivation was by Pseudomonas aeruginosa. Biosurfactant showed similarity to rhamnolipids by Thin Layer Chromatography (TLC). Assessment of bioactive propertiaes of rhamnolipid showed strong antimicrobial activity against Bacillus spp. Future investigations can be focused on application of these strains in environmental as well as industrial sectors
Bacterial Conversion of Waste Products into Degradable Plastics: An Inexpensive Yet Eco-friendly Approach
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