Calif., Univ. of California, Diss.--San Diego, 2004. / Kopie, ersch. im Verl. UMI, Ann Arbor, Mich. - Enth.3 Beitr.

Univ., Diss.--Basel, 2006. / Die Vorlage enth. insgesamt 3 Werke.

Univ., Diss.--Uppsala, 2005. / Enth. 5 Beitr.

Business School, Diss.--Jönköping, 2007. / Die Vorlage enth. insgesamt 7 Werke.

Handelshøyskole, Diss.--Bergen, 2007. / Enth. 4 Beitr.

Diss. (sammanfattning) Uppsala : Sveriges lantbruksuniv., 2009. / Härtill 4 uppsatser.

Diss. (sammanfattning) SLU : Sveriges lantbruksuniv., 2009. / Härtill 4 uppsatser.

This thesis challenges previous historiography and suggests an alternative explanation for the first appearance in writing of the ḥadīth relating the collection and codification of the Qur’ān. Rather than equating this “sudden” appearance with fabrication, I argue that the ḥadīth were already in oral circulation, and put in writing in Abū ʿUbayd’s Faḍā’il al-Qur’ān in order to serve the religio-political goals of the Abbasid Caliph al-Ma’mūn (r. 197/813-218/833). I argue that Abū ʿUbayd’s inclusion of the collection and codification accounts, which emphasize caliphal authority over the written Qur’ān, were intended to support al-Ma’mūn’s campaign to control religious authority as exemplified in the Miḥna. / text

With the recent development of smart-well technology, the reservoir community now faces the challenge of developing robust and efficient techniques for reservoir characterization by means of data inversion. Unfortunately, classical history-matching methodologies do not possess computational efficiency and robustness needed to assimilate data measured almost in real time. Therefore, the reservoir community has started to explore techniques previously applied in other disciplines. Such is the case of the representer method, a variational data assimilation technique that was first applied in physical oceanography. The representer method is an efficient technique for solving linear inverse problems when a finite number of measurements are available. To the best of our knowledge, a general representer-based methodology for nonlinear inverse problems has not been fully developed. We fill this gap by presenting a novel implementation of the representer method applied to the nonlinear inverse problem of identifying petrophysical properties in reservoir models. Given production data from wells and prior knowledge of the petrophysical properties, the goal of our formulation is to find improved parameters so that the reservoir model prediction fits the data within some error given a priori. We first define an abstract framework for parameter identification in nonlinear reservoir models. Then, we propose an iterative representer-based scheme (IRBS) to find a solution of the inverse problem. Sufficient conditions for convergence of the proposed algorithm are established. We apply the IRBS to the estimation of absolute permeability in single-phase Darcy flow through porous media. Additionally, we study an extension of the IRBS with Karhunen-Loeve (IRBS-KL) expansions to address the identification of petrophysical properties subject to linear geological constraints. The IRBS-KL approach is compared with a standard variational technique for history matching. Furthermore, we apply the IRBS-KL to the identification of porosity, absolute and relative permeabilities given production data from an oil-water reservoir. The general derivation of the IRBS-KL is provided for a reservoir whose dynamics are modeled by slightly compressible immiscible displacement of two-phase flow through porous media. Finally, we present an ad-hoc sequential implementation of the IRBS-KL and compare its performance with the ensemble Kalman filter. / text

Objective: To describe and compare the characteristics of blood donors and non-donors and to examine factors associated with donation, including motivators and barriers of blood donation in Guangzhou, China. Design: Cross-sectional survey using self-administered standardized structured questionnaires on both donors and non-donors. Setting: 12 mobile and 4 permanent blood donation stations in Guangzhou during the whole operation time. Participants: 500 blood donors who donated at the donation sites and 500 non-donors who never donated and passed by the station were asked to complete a self-administered questionnaire during Dec 10, 2013 to Jun 25, 2014. Main outcome measures: Blood donation or no donation. Results: 1080 questionnaires were collected, of which 1034(95.7%) questionnaires were valid. 602(58.2%) participants were donors and 432(41.8%) were non-donors. Older people (OR: 1.46, 95% confidence interval: 1.24 to 1.72, p<0.01), males (1.33, CI: 1.02 to 1.71, p=0.03), non-college-students (1.76, CI: 1.16 to 2.56, p<0.01) and people with higher education level (1.27, CI: 1.11 to 1.45, p<0.01) were more likely to be donors. The main objective of blood donation was helping patients (n=405, 68.2%), and the main reason of not donating was being in poor health (n=138, 33.1%). However, other motives, such as benefiting health and free check for blood type and body, and obstacles, such as failing to meet the requirements and fear, were also important. More male donors would donate again than females (80.5% vs. 68.5%, p<0.01), whereas more female donors showed uncertainty than males (25.9% vs. 16.6%, p<0.01). Usage of blood (n=182, 46.7%) was what non-donors wanted to know the most if they were to donate in the future. The majority of participants (n=730, 71.3%) considered raising the awareness of blood donation among people was one of the most effective ways of blood donation promotion. Television was considered as one of the most effective methods of blood donation promotion and recruitment, and was more acceptable to females. Younger participants preferred the internet. Conclusion: These findings suggest that raising the awareness of blood donation is vital. Campaigns should focus on multiple aspects targeting different groups of people. Television and the internet are useful tools of blood donation promotion and recruitment. / published_or_final_version / Public Health / Master / Master of Public Health