Thesis (Ph. D.)--University of Chicago, Department of Statistics, June 2001. / Includes bibliographical references. Also available on the Internet.

Industrial hemp is legally defined in the United States by the Agriculture Improvement Act of 2018 (2018 Farm Bill) as Cannabis containing <0.3% total tetrahydrocannabinol (THC). The 2018 Farm Bill does not, however, specify standard methods for sample preparation or quantification of cannabinoids (including THC) in Cannabis. Extraction efficiency of phytochemicals is well-known to depend on the solvent and extraction method used. In this project, we evaluated the effect of sample preparation extraction methods on the quantitative analysis of five cannabinoids found in industrial hemp with regulatory or commercial significance: cannabidiol (CBD), cannabidiolic acid (CBDA), delta-9-tetrahydrocannabinol (THC), tetrahydrocannabinolic acid (THCA), and cannabinol (CBN). Extraction methods evaluated include: QuEChERS, diethyl ether, ethanol, and methanol. Extracts obtained via these methods were subject to quantitative cannabinoid analysis by UPLC/PDA. Standard curves for quantification of each cannabinoid were constructed using authentic standards for quantification. The concentrations of each cannabinoid in the plant material determined via each of the extraction methods were compared using one-way ANOVA followed by Tukey's HSD (significant difference defined as p <0.05). All extraction methods evaluated returned different concentrations of total THC in the plant material. The QuEChERS extraction resulted in the highest calculated concentrations of THC, THCA and CBDA, reporting three to four times greater than obtained via other extractions evaluated. Classification of the starting plant material as hemp or marijuana depended on the extraction method used. These findings clearly and quantitatively demonstrate the need for standardization of extraction methods for hemp analysis and regulation. / Master of Science in Life Sciences / Hemp is a type of Cannabis plant that produces an insignificant amount of the psychoactive cannabinoid tetrahydrocannabinol (THC). Hemp was federally illegal in the United States until the 2018 Farm Bill differentiated hemp from Marijuana, defining hemp as containing less than 0.3% total THC. Standard methods for cannabinoid testing in hemp have not been defined. In this project, four extraction methods with potential use for sample preparation in hemp analysis were evaluated and compared. The extraction methods evaluated included: ethanol, methanol, QuEChERS, and diethyl ether. The concentrations of cannabinoids in each of the plant extracts were then determined using an appropriate analytical method and authentic standards for Cannabidiol (CBD), Cannabidiolic Acid (CBDA), THC, Tetrahydrocannabinolic Acid (THCA), and Cannabinol (CBN). Total concentrations of each cannabinoid in the plant material were then calculated using each extraction method. All extraction methods evaluated resulted in different concentrations of total THC in the plant material, with QuEChERS resulting in the highest calculated concentrations of THC, THCA, and CBDA. The identify of this plant material as hemp or marijuana depended on the extraction method used. This result is not surprising, as extraction efficiency of phytochemicals is well known to depend on the solvent and extraction method used. Nonetheless, our findings clearly demonstrate the need for standardization of extraction methods for hemp analysis and regulation.

Thesis (Ph.D.)--Hong Kong University of Science and Technology, 2005. / Includes bibliographical references (leaves 77-82). Also available in electronic version.

Thesis (Ph. D.)--University of Texas Health Science Center at Houston, School of Public Health, 2008. / Source: Dissertation Abstracts International, Volume: 69-02, Section: B, page: 1086. Adviser: Wenyaw Chan. Includes bibliographical references.

Baigiamajame magistro darbe analizuojama prilydomos stogo dangos susiklijavimo kokybė atsižvelgiant į tai, kiek laiko buvo kaitinama danga. Bandymams atlikti buvo naudojama UAB „Gargždų Mida“ danga. Iš dangos rulono buvo išpjauti bandiniai kurių ilgis ir plotis 15 ir 10 cm. Buvo numatyta, kad eksperimento metu bandiniai bus kaitinami nuo 1 sekundės iki 15, tačiau pasiekus 9 sekundžių kaitinimo ribą bandinys vos nesuirdavo, todėl daugiau laiko kaitinti buvo atsisakyta. Darbe išanalizuotos sutapdintų stogų rūšys, įvertinti kiekvienos rūšies privalumai ir trūkumai. Išnagrinėtos jų technologijos bei išryškinti veiksniai, labiausiai darantys įtaką būsimojo stogo sandarumui. Išanalizuoti sutapdintų stogų defektai, jų atsiradimo priežastys. Išnagrinėjus sutapdintų stogų technologijas ir pratekėjimo vietų nustatymo metodus, pateikiamos baigiamojo darbo išvados. Darbą sudaro 8 dalys: įvadas, darbo tikslas, terminai ir apibrėžimai, stogų būklės analizė, sutapdintų stogų plokštumos sandarumo būklės analizė, ritininių stogo dangų įrengimas, ypatumai bei reikalavimai, prilydomosios stogo dangos klijavimo ypatumai, dangos prijungimo prie parapetų ir skardos paviršių ilgalaikis tyrimas, dangos prisiklijavimo ploto tyrimas atsižvelgiant į kaitinimo laiką, išvados, literatūros sąrašas. Darbo apimtis – 60 p. teksto, 39 pav., 10 lent., 55 bibliografiniai šaltiniai. / This job contains an analysis of welded roof covering joints and joints between wooden, metal, and cemented surfaces. All tested samples was made from roof covering material of “Gargždu Mida“ and „Ico Pal“. During experiments was investigated glued intersection among two roof coverings and among cover-base surface. It was showed that the quality of welded intersection depend on the time of heating the roof cover bottom layer. Optimal heating time is about 9 seconds, because in this time period we can reach maximum welded intersection without damaging the covering material inner structure. There is done the analysis of technology for flat roofs, the main factors are selected, which influence tightness of roofs. The analysis of shortcomings of roofs and its reasons is presented. The conclusions are presented, after analysis of technologies of flat roofs and method to determine the glued section of coverings. Structure: introduction, the objective, main concepts, flat roofs, , analysis of state of flat roofs, analysis of flat of roofs, ,created new method to determine the glued section, conclusions, references. Thesis consists of: 56p. text, 40 pictures, 10 tables, 55 bibliographical entries. Keywords: flat roof, effusion places, method analysis, flat tightness, roofing defects.

Industrial processes have for a long time become more and more automated, this is no different in the mining industry. When excavating during mining operations special drill rigs are used to drill holes in the rock walls to be used for either explosives or bolts to support the structure. The study aimed to find out if it was possible to create an algorithm that would use the drill rigs telemetry data to estimate the number of holes it had created over specific time period. The main approach would be to see if machine learning could be used for the problem or if some other method could be theorised. Without the groundwork needed to create a proper machine learning algorithm a basic statistical approach was used to solve the problem, however since there were no actual reports containing the amount of holes a rig drilled the final solution is highly conjectural.

<p>This study explored the role of idiosyncratic service experience by redefining the wow experience in the context of boutique hotels. Despite the expansion of the boutique hotel segment, which seeks to provide a unique and singular experience, in the lodging industry and the growing popularity of pursuing novel experiences among Millennial consumers, the role of idiosyncratic experience in consumer behavior has not been explored. This left the potential antecedents and consequents of idiosyncratic hotel stay experience—and its role in consumer’s decision-making process—unknown. In this study, a consumer’s perception of a hotel stay experience, which is unusual in an interesting and surprising way, is coined as the perceived quirky experience (PQE). Utilizing the Mehrabian-Russel model, the relationship among boutique hotel service quality aspects, motives and barriers, PQE, and behavior intentions were examined. The consumer decision-making process is expected to be influenced by the optimal stimulation level (OSL); thus, the group differences between stimulation avoiders and seekers were also explored. </p> <p>Methodologically, the current study also seeks to provide a novel approach to amalgamate qualitative and quantitative data. By integrating qualitative analysis of 175,407 TripAdvisor reviews and quantitative analysis of field data (n = 498), topic modeling using an unsupervised machine learning process was performed. Identified keywords were used for aspect-based sentiment analysis and to construct measurement items for the quantitative study stage. Statistical tests were performed using logistic regression and path analysis—and multi-group analysis. The results of this study suggested that boutique hotel-specific service quality aspects have a stronger effect on PQE, and this internal state leads to strong behavioral intentions regardless of temporal differences. The consumer’s stimulation-seeking tendency influenced multiple paths in the consumer’s decision-making process. </p> <p>This study is the first to explore the role of idiosyncratic service experience in the boutique hotel setting and makes theoretical contributions to understanding consumer behaviors involving the perception of uncommon and interesting experiences. The findings of this study provide practical contributions to boutique hotel developers regarding the relative importance of service quality aspects to create a unique and singular stay experience and also provide hotel and brand managers with insightful marketing implications.</p>

No description available.

Single cell proteins such as that of edible filamentous fungal biomass are considered as a promising sustainable source of animal feed supplementation. Filamentous fungi can be cultivated on different organic substrates including volatile fatty acids (VFAs) such as acetic, propionic, and butyric acids. These VFAs can be generated through the famous waste valorisation approach of anaerobic digestion (AD) as intermediate metabolites. This project investigates a sustainable approach for the production of animal feed supplementation through cultivation of fungal biomass on waste derived VFAs along with the in vitro analysis of fungal biomass digestibility as ruminant feed. In this regard, optimum conditions for the production of Aspergillus oryzae biomass on different VFAs effluents derived from anaerobic digestion process of food waste plus chicken manure (FWCKM) and potato protein liquor (PPL) at different pH, nitrogen sources, and feed mixture was studied. Accordingly, analyses showed that PPL has the highest biomass yield with 0.4 (g biomass/g consumed VFAs) based on the volatile solids (VS) by adjusting pH to 6.2. Furthermore, the digestibility of the produced fungal biomass is analysed by using three different in vitro digestion methods including Tilley and Terry (TT) method, Gas Production Method (GPM), and Nylon Bag Method (NBM) and the results are compared with the conventional feed (silage and rapeseed meal). Results obtained from different digestibility methods illustrate that different A. oryzae fungal biomass had approximately 10-15 % higher dry matter digestibility fraction compared to silage and rapeseed meal (reference feeds). Hence, these results revealed that A. oryzae fungal biomass can grow on VFAs effluents and produce protein-rich fungal biomass while this biomass has better digestibility compared to conventional feeds and confirmed the initial hypothesis of the study.

This paper examines the lowest political participation groups in Swedish society, through four interviews with people who belong to various social groups with the lowest levels of political participation. The aim of this study is to increase the understanding of how political inequalityis manifested in Swedish societies. The purpose of this thesis is to map what factors characterize people who are politically active within the groups of society with the lowest levels of political participation in terms of resources, motivation, and recruitment network. The second aim of this research is to understand what factors are important to their political involvement. We hope that the findings of this research can be used as guidelines in futurework to encourage increased participation among the groups that have the lowest levels of participation in Sweden. This paper uses a multi-method study that combines the quantitative method and qualitative method. The multi-method study allows us to examine the research questions from a quantitative and qualitative angle. The qualitative part of the study examinesthe factors that make individuals from the least represented groups in society participate. The qualitative part of the study concluded that the factors that make individuals from the least represented groups in society partake in politics are, network, time and motivation as three decisive factors that influence political engagement among the groups that are far from politics.The results also show that those who are furthest from politics values the right to vote and therefore participate even though they have no interest in politics, it can also be interpreted as a sense of social duty. / Denna studie undersöker fyra intervjuer med personer som tillhör olika grupper som står långt från politiken för att öka förståelsen om hur den politiska ojämlikheten ser ut i svenska samhället. Vi hoppas att de fynd som hittats i denna studie kan användas i vidare studier och i arbete om att främja ett ökat deltagande bland de grupper som deltar i minst utsträckning i Sverige. Syftet med uppsatsen är att kartlägga vilka faktorer som utmärker personer som är politiskt aktiva inom de grupper som står långt från politiken i termer av resurser, motivationoch nätverk samt vilka faktorer de anser som viktiga för deras politiska engagemang. För att göra detta har uppsatsen använt flermetodsstudie som kombinerar kvantitativ metod och kvalitativ metod. En flermetodsstudie ger oss möjligheten att undersöka de givna frågeställningarna utifrån både en kvantitativ och kvalitativ vinkel, vilket ger studien både en bredd och ett djup. Den kvantitativa delen identifierar de olika grupperna i det svenska samhället som har ett lågt politiskt deltagande genom en enkätstudie. Den kvalitativa delen av studien synliggör de faktorer som får individer från de minst representerade grupperna i samhället att visa på ett politiskt deltagande. Den kvalitativa delen av uppsatsen framförföljande slutsats; nätverk, tid och motivation är tre avgörande faktorer som påverkar politiskt engagemang med bland de grupper som står långt ifrån politiken. Resultaten visar även på att de som står längst ifrån politiken värderar rösträtten vilket gör att de deltar trots att de saknarett intresse för politik, vilket kan tolkas som en känsla av samhällsplikt.