1,268 research outputs found
Theme park visitor travel patterns
This study was designed to address several related problems. (1) To determine the difference, if any, between national travel patterns and those of 1982 Easter Week visitors to Marriott’s Great America (Santa Clara, California) and Marine World Africa U.S.A (Redwood City, California). (2) To determine the differences, if any, between the 1982 Easter Week travel patterns of visitors to Marriott’s Great America and Marine World Africa U.S.A. (3) To determine the difference, if any, between the distances visitors traveled to Marriott’s Great America and Marine World Africa U.S.A. during the summer of 1981 and the 1982 Easter Week.
The problems dictated the necessity to address several subproblems. (1) To determine the distances visitors traveled; (2) mode of transportation used; (3) percentages of visitors traveling less than and more than 300 miles; (4) percentages of visitors utilizing various modes of transportation to Marriott’s Great America and Marine World Africa U.S.A. during the 1982 Easter Week; (5) to determine the difference between the distances visitors Marriott’s Great America traveled during the summer of 1981 and the 1982 Easter Week; and (6)to determine the difference between the distances visitors to Marine World Africa U.S.A. traveled during the summer of 1981 and the 1982 Easter Week
Energy Harvesting Networks with General Utility Functions: Near Optimal Online Policies
We consider online scheduling policies for single-user energy harvesting
communication systems, where the goal is to characterize online policies that
maximize the long term average utility, for some general concave and
monotonically increasing utility function. In our setting, the transmitter
relies on energy harvested from nature to send its messages to the receiver,
and is equipped with a finite-sized battery to store its energy. Energy packets
are independent and identically distributed (i.i.d.) over time slots, and are
revealed causally to the transmitter. Only the average arrival rate is known a
priori. We first characterize the optimal solution for the case of Bernoulli
arrivals. Then, for general i.i.d. arrivals, we first show that fixed fraction
policies [Shaviv-Ozgur] are within a constant multiplicative gap from the
optimal solution for all energy arrivals and battery sizes. We then derive a
set of sufficient conditions on the utility function to guarantee that fixed
fraction policies are within a constant additive gap as well from the optimal
solution.Comment: To appear in the 2017 IEEE International Symposium on Information
Theory. arXiv admin note: text overlap with arXiv:1705.1030
Dilemma of applying Islamic sharia’a through takhayur and talfiq principles in the modern Egyptian legal system
For many Egyptians, the only path to modernity in the Egyptian legal system is believed to be through utilizing Islamic sharia’a. Between the nineteenth and twentieth centuries, the Egyptian legal elite worked to introduce a modern interpretation and application of Islamic sharia’a. The Islamic principles takhayur and talfiq were used to do this. While the main usage of takhayur and talfiq was to legitimize the modern legal system by maintaining the usage of Islamic sharia’a, the legal practice reached a contradictory outcome. The Courts have been unable to decide on the exact relationship between Islamic sharia’a and other legal texts. This confusion has produced ambiguity and uncertainty in legal practice. This situation of uncertainty in the legal system is inevitable because of the differences in the underlying nature and philosophy of the modern and sharia’a legal systems. Accordingly, the Egyptian legal system may require additional secular reform to reduce the uncertainty by stressing the superiority of the legal text
Decreasing Occlusion and Increasing Explanation in Interactive Visual Knowledge Discovery
Lack of explanation and occlusion are the major problems for interactive visual knowledge discovery, machine learning and data mining in multidimensional data. This thesis proposes a hybrid method that combines visual and analytical means to deal with these problems. This method, denoted as FSP, uses visualization of n-D data in 2-D in a set of Shifted Paired Coordinates (SPC). SPC for n-D data consists of n/2 pairs of Cartesian coordinates that are shifted relative to each other to avoid their overlap. Each n-D point is represented as a directed graph in SPC. It is shown that the FSP method simplifies pattern discovery in n-D data providing explainable rules in a visual form with significantly decrease of the cognitive load for analysis of n-D data. The computational experiments on real data has shown its efficiency on both training and validation data
Job satisfaction and job performance with moderating effect of Islamic work ethics in Yemen
Job performance which focuses on improving workers productivity has been the most widely dependent variable studied in the field of industrial and organisational psychology. In Yemen, universities face many problems that prevent the achievement of quality education, a motivated workforce, improved learning, a good learning environment, and the general development of the university system. In the context of Yemen, more than 10% of the financial budget for higher education have been returned to the Ministry of Finance at the end of each year. This is a good reason to believe that there is a lack of staff, and the ability to utilize resources effectively to improve learning and the general conditions of the learning environment. Findings of previous studies regarding the relationship between job satisfaction and job performance were mixed,
hence suggesting the need to incorporate a moderating variable. Drawing upon the social
exchange theory, Weber’s theory, and Herzberg’s motivator - hygiene theory, this study
examined the moderating role of Islamic work ethics (IWE) on the relationship between
job satisfaction and job performance among 475 administrative staffs in the Yemeni public universities. Using the Partial Least Squares structural equation modelling (PLSSEM), the results show that work itself was significantly related to contextual performance. Similarly, supervision and work itself were significantly related to task performance. In addition, the relationship between work itself and task performance was found to be moderated by IWE. Conversely, IWE was not found to be a moderator
variable on the relationships between co-workers, pay, promotion, supervision, and
contextual performance. The direct and moderating effect of IWE on the relationship
between overall job satisfaction and overall job performance was also supported. The
theoretical and practical contributions of the study are discussed and suggestions for future research are provide
Geophysical characteristics of nickel and copper deposits in Wadi Al Khadra prospect, southwestern of Saudi Arabia
“Three geophysical datasets (self-potential, magnetics, and time - domain electromagnetics) were acquired at Wadi Al Khadra Ni-Cu prospect in southwest Saudi Arabia, and were processed and interpreted for the Saudi Geological Survey. The primary objectives were to map the distribution of metallic mineralization, map structures, verify the integration of the geophysical interpretations and its signatures in conjunction with boreholes information, distinguish the similarities and differences in the integrated interpretation of geophysical data, and design optimal processing and interpretation data parameters. The self-potential tool was used to map the variation in natural surface potential differences to map lateral variations in the distribution of shallow metallic minerals, specifically copper and nickel, qualitatively. The time-domain electromagnetic tool was utilized to measure the lateral and vertical variations in the conductivity of the subsurface to map the distribution of metallic mineralization to depths approximately 140 meters and structures (faults) that control the distribution of mineralization qualitatively. A magnetic tool was used to map lateral variations in the magnetic field of the earth to map the distribution of magnetically susceptible mineralization (magnetite and nickel) and structures (faults) that control the distribution of mineralization and to map structures qualitatively. Surface-based geologic data and core hole control were used to constrain the interpretation of the geophysical data.
The investigation was successful. The interpreted geophysical data sets are consistent with one another (re: distribution of metallic mineralization) and consistent with surface-based geologic control and core hole data”--Abstract, page iii
The Role of International Organizations in Supporting Children under Conflicts: the case study of Yemen
不同国家的一些国际组织正在努力打击侵犯儿童的行为,并给予他们足够的照顾,尤其是 在冲突时期。为了履行自己的职责和工作,他们必须面对许多挑战,包括国际社会的不作 为,捐款人资助活动的缺乏、政府的缺位以及对儿童权利认识的缺乏。 研究的题目是,国际组织对战区儿童的生计有积极贡献吗?为了回答这一问题,本研究旨 在调查国际组织对战区儿童在营养、健康、教育和保护方面的基本生活需要的贡献。同 时,本研究以发展中国家儿童的实际情况为例,以也门最近的危机为个案研究。 研究问题通过强调讨论的中心四项决定来回答。在调查过有关国际组织工作的论证和事实 之后,很明显,在各种各样的情况下,国际组织确实有通过...Several International Organizations in the different countries are trying to counter the violations against children and provide the sufficient care for them especially in the conflicting periods. To do their roles and work, they are required to face many challenges including the international community's inaction, the scarcity of donations to finance their activities, the absence of the gover...学位:法学硕士院系专业:南洋研究院_国际关系学号:3022014115450
Miniaturized High-Q Tunable RF Filters
This dissertation focuses on the investigation and development of novel efficient tuning techniques and the design of miniaturized high-Q tunable RF filters for high-performance reconfigurable systems and applications. First, a detailed survey of the available tuning concepts and state-of-art tunable filters is provided. Then, a novel so-called inset resonator configuration is presented for the applications of fixed and tunable coaxial filters. The design procedure of frequency tunable filters with constant absolute bandwidth (CABW) is described, and various tunable inset filters are implemented, offering many desirable merits, including the wide tuning range and stable high-Q with minimum variation. For wide octave frequency tuning ranges with CABW, a second novel concept is presented using so-called re-entrant caps tuners. Beside simplicity and compactness, this technique also features enhanced spurious performance and wider tuning capabilities than the conventional means. Also, in this dissertation, various miniaturized reconfigurable dual-band/dual-mode bandpass filters and diplexers are presented using compact dual-mode high-Q TM-mode dielectric resonators. Furthermore, a novel microfluidic-based ultra-wide frequency tuning technique for TM010-mode dielectric resonators and filters is introduced in this dissertation. In addition to the very wide tuning window, this mechanism has key advantages of low-cost, simplicity, and intrinsic switch-off. Lastly, the dissertation includes a novel bandwidth reconfiguration concept with multi-octave tuning using a single element for coaxial bandpass filters. This mechanism brings many features including the fast tuning, constant high-Q, intrinsic switch-off, and wide BW-reconfiguration
A web content mining application for detecting relevant pages using Jaccard similarity
The tremendous growth in the availability of enormous text data from a variety of sources creates a slew of concerns and obstacles to discovering meaningful information. This advancement of technology in the digital realm has resulted in the dispersion of texts over millions of web sites. Unstructured texts are densely packed with textual information. The discovery of valuable and intriguing relationships in unstructured texts demands more computer processing. So, text mining has developed into an attractive area of study for obtaining organized and useful data. One of the purposes of this research is to discuss text pre-processing of automobile marketing domains in order to create a structured database. Regular expressions were used to extract data from unstructured vehicle advertisements, resulting in a well-organized database. We manually develop unique rule-based ways of extracting structured data from unstructured web pages. As a result of the information retrieved from these advertisements, a systematic search for certain noteworthy qualities is performed. There are numerous approaches for query recommendation, and it is vital to understand which one should be employed. Additionally, this research attempts to determine the optimal value similarity for query suggestions based on user-supplied parameters by comparing MySQL pattern matching and Jaccard similarity
Functionalization of Cucurbituril Derivatives Towards Enhanced Oral Drug Delivery
Cucurbiturils (Q[n]) are cage-like molecules with diverse potential applications, including drug delivery. They act as molecular hosts for encapsulating smaller molecules through various intermolecular interactions. Q[n] are mainly utilized as drug delivery vehicles, which is the thesis focus. Q[n] have demonstrated promising drug delivery properties, including increased bioavailability, reduced toxicity, improved stability, controlled release, targeted delivery, and delivery of biomolecules. Oral administration is preferred by patients due to its convenience, non-invasive nature, and cost-effectiveness. However, most studies have used Q[n] for injection routes, and only two have focused on their oral drug delivery capabilities. Thus, further investigation is needed, especially given their high chemical stability.
The aim of this thesis was to enhance the oral drug delivery properties of Q[n] by covalently bonding it to other moieties with well-established oral delivery properties. This novel combination was anticipated to provide better oral drug delivery properties than either component alone. However, to achieve this combination functionalization of the Q[n] molecules was first required to facilitate covalent bonding between the two moieties. This functionalization was challenging due to the inertness of Q[n]. Therefore, this thesis focuses on functionalizing the tetrahydrothiophene ring (THT) of THTQ[7 and 8] for use as oral drug delivery vehicles.
Recently, partially substituted THTQ[n] were introduced and derived from the condensation of unsubstituted glycoluril and THT-glycoluril diether. However, limited studies have been conducted on the functionalization of the THT ring of the THT-glycoluril. This thesis investigates the functionalization of the THT ring of THT-glycoluril as a model for application to THTQ[n]. After exploring three pathways, the pathway of the nucleophilic substitution of the 2-Cl-THT glycoluril diether was identified as the most promising for use on THTQ[n].
During the course of developing the synthetic procedures on electrophilic THT-glycoluril derivatives it was observed that the reactivity of nucleophilic substitution reactions was not as expected in the presence of bases, which deviated from the behaviour previously described in literature. Some limited reactivity was attributed to both the presence of steric hindrance and appeared to be related to the acidity of the proton alpha to sulfur in the derivatives under study.
To further comprehend this phenomenon, computational calculations were performed to evaluate the pKa of the proton alpha to sulfur in the THT-derivatives as well as in comparison to related compounds documented in the literature. The findings indicated that besides the impact of steric hindrance, the acidity of the protons alpha to sulfur can significantly influence the derivatisation reactions of sulfur-containing compounds. From this study it was determined that the acidity of those protons should be taken into consideration when designing reactions for such substances.
The most effective pathway established on the model THT-glycoluril diether was through the 2-Cl-THT glycoluril derivative, which was adapted to produce 2-Br-THTQ. The latter was then substituted with various moieties important for oral drug delivery through an ether linkage and alkylated with different moieties to introduce new functionalities. One of the obtained derivatives (PEG-THTQ[7]) was tested for the stability of the ether linkage in simulated gastric fluid. The study revealed that the linkage is stable to the acidic medium of the stomach. This enhances the suitability of the series for further assessments
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