Thesis: B.S., Massachusetts Institute of Technology, Department of Mechanical Engineering, 1976 / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / B.S. / B.S. Massachusetts Institute of Technology, Department of Mechanical Engineering

<p>The sex ratio at birth in China has been increasingly skewed in favor of males since 1980 when the government implemented the one-child policy to control population growth. Existing studies commonly point to economic factors and their weakening effect on the Confucian tradition of son preference to understand the male-biased sex ratio at birth; however, a perspective that heavily focuses on economic factors is limited. In this dissertation, I argue that bringing in religion – a key factor shaping individual attitudes and decisions related to son preference – can shed important light upon sex ratio at birth patterns in China.</p><p>This dissertation is divided into three empirical chapters. The first study explores religious effects on county-level sex ratios at birth using data from the 2000 China Population Census and the 2004 China Economic Census. Findings reveal that greater Daoist presence is associated with more imbalanced sex ratios in the county, while the presence of Islamic and Buddhist places of worship helps mitigate male-biased sex ratios. Study two askes how religious groups vary in their preferences for sons and sex selection decisions using data from the 2010 Chinese General Social Survey (CGSS). Findings suggest that Christians stand out for their weak son preference and refrain from sex selection, while Daoists hold strong son preference and more likely to practice sex selection to have many sons. The last study uses the CGSS data to explore whether religion shapes abortion attitudes among Chinese people. It shows that Islam and Christianity have a strong influence on the disapproval of abortion, and while affiliating with Daoism does not affect one’s approval of abortion, living in a neighborhood with more Daoists significantly reduces one’s approval of abortion.</p><div><p>These studies together demonstrate that religion is an important factor shaping not only individual attitudes and behaviors but also demographic trends in society. This dissertation serves as the first study that investigates the linkage between religion and demographic trends by examining how religion – both individual religious affiliation and religious context in a locality – affects the sex ratio at birth via shaping individual son preferences, sex selection decisions, and abortion attitudes. By highlighting religion – a factor that has been overlooked in demographic studies of China – this study contributes to a more nuanced understanding of imbalanced sex ratios and its determinants.</p></div><p></p>

Current forensic DNA analysis utilizes capillary electrophoresis (CE) to separate short tandem repeat (STR) fragments based on their length. Next generation sequencing (NGS) is the next evolution of forensic DNA profiling, and though dedicated forensics protocols are still fairly new, it is only a matter of time before NGS becomes the new standard for forensic DNA profiling. Stutter has been a problem ever since forensic STR testing was first implemented. The slipped strand mispairing model is the proposed mechanism for how stutter occurs, and it appears to be an intrinsic part of the polymerase chain reaction (PCR). Samples that were run via the ForenSeq™ DNA Signature Prep Kit were amplified using the DNA Primer Mix A (DPMA) and then sequenced on a MiSeq FGx™ Forensics Genomics System. Samples were also amplified using the GlobalFiler™ PCR Amplification kit and fragment separation was done via capillary electrophoresis. Stutter ratios were calculated by dividing the read count /relative fluorescence unit of the stutter allele by the read count / relative fluorescence unit of the parent allele. Stutter ratio comparisons were made between the ForenSeq™ and GlobalFiler™ kits as well as between the parents and the children in the family pedigree, though only samples tested using the ForenSeq™ kit were used. Comparison of overall stutter ratios revealed that the ForenSeq™ kit produced higher stutter across all STR loci, except for D13S317 and D2S441, when compared to the GlobalFiler™ kit. The different chemistries between the two kits, potential usage of different polymerases, and the fact that the ForenSeq™ kit requires two rounds of amplification can serve as likely explanations for this difference. There was also quite a bit of variability observed for the stutter ratios between loci in the samples run using the ForenSeq™ kit. Possible explanations for this could be that the cluster generation step could produce more clusters for some stutter products over others. Comparison of the stutter ratios for the pedigree obtained from the Coriell Institute revealed no differences between the parents and the respective alleles inherited by the children when tested with the ForenSeq™ kit. Some loci showed a difference between the parent and children, but that could simply be due to the sample size. The utilization of NGS for STR testing can result in two alleles of the same length but different sequences, called isoalleles. Analysis of isoalleles present at D21S11 in the children samples from the Coriell Institute pedigree showed that the isoalleles had different mean stutter ratios. The results open the possibility of potentially utilizing sequence-specific stutter filters in the ForenSeq™ Universal Analysis Software. The model of the longest uninterrupted stretch (LUS) has been around for some time, though recently the block length of missing motif (BLMM) has been proposed as a better predictor for stutter ratios. The results of stutter ratio analysis at D21S11 show that as the length of the BLMM increases, so too does the stutter ratio.

Revenue insurance with shallow loss protection for farmers has been introduced recently. A common attribute of most shallow loss proposals is that they would be arearevenue triggered. The impact on optimal hedge ratios of combining these shallow loss insurance proposals with deep loss farm-level insurance is examined. Since crop insurance, commodity programs and forward pricing are commonly used concurrently to manage crop revenue risk, the optimal combinations of these tools are explored. Numerical analysis in the presence of yield, basis and futures price variability is used to find the futures hedge ratio which maximizes the certainty equivalent of a risk averse producer. The results generally reveal a lower optimal hedge ratio with area-insurance than with individual insurance and show that shallow loss revenue insurance tends to slightly increase optimal hedge ratios.

<p> The primary purpose of this study was to date the last metamorphism of a metanorthosite near Parry Sound, Ontario, by the Rb-Sr method on the mineral phases: biotite, hornblende and plagioclase. Due to problems with the mass spectrometer, the prepared samples could not be run. </p> <p> K/Rb ratios on biotites and plagioclase give a calculated K/Rb whole rock ratio for the mafic rich bands of about 230, consistent with the main trend of igneous rocks. The plagioclase K/Rb ratio, however, is much higher, and the anorthosite body as a whole may have a much higher K/Rb ratio, consistent with oceanic tholeiites and achondritic meteorites and indicating a possible lower crustal or mantle origin. </p> / Thesis / Bachelor of Science (BSc)

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