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J. López Quiroga-O. Brandt-C. Pappalardo-S. Cresci (editors): Episcopus, ciuitas, territorium (Proceedings of the XV International Congress on Christian Archaeology, Toledo 8th-12th September 2008), Rome, 2013.
American Antiquity, 2002
Fifty-five pieces of lava with impressions of prehistoric corn have recently been recoveredfrom NA 860, a small habitation site near Sunset Crater Volcano in northern Arizona. Archaeological, geological, and botanical information suggest that husked ears of corn were deliberately placed in the lava's path when the volcano erupted in the mid-to-late eleventh century A.D. Over 40 kg of basalt lava containing the hardened corn casts were then taken to NA 860 located 4 km away from the lava flow. At the site, the rocks underwent lithic reduction to expose the casts. We suggest that these "corn rocks" are indicative of ritual practices, perhaps serving as an offering made to appease the forces responsible for the eruption. Although both prehistoric and modern offerings are commonly associated with volcanoes in other parts of the world, this is the first evidence from the Southwest United States of possible ritual behavior related to volcanism. Cincuenta y cinco pedazos de lava con impresiones de mafz prehistoricofueron descubiertos recientemente en NA 860, un pequeno sitio de habitacion cerca del volcan Sunset Crater en el noroeste de Arizona. Informacion arqueol6gica, geol6gica, y botanica sugieren que las mazorcas de mafzfueron intencionalmente colocadas en la trayectoria de la lava cuando el volcan hizo erupcion en la segunda mitad del siglo XI d. C. Mds de 40 kg. de lava basdltica conteniendo impresiones de mafz se recuperaron en el sitio NA 860, a 4 km de distancia de la lava. En este sitio, las rocasfueron trabajadas para exponer las impresiones. Sugerimos que estas 'rocas de maiz' indican practicas rituales, y que quizas estas rocas sirvieron como ofrendas para apaciguar a las fuerzas responsables por la erupci6n. Aunque las ofrendas asociadas con volcanes son comunes en otras partes del mundo, tanto en la prehistoria como en tiempos modernos, esta es la primera evidencia de practicas rituales asociadas con vulcanismo que se ha recuperado en el suroeste de los Estados Unidos.
Uluslararası 14. ve 15. Yüzyıl İslam Düşüncesinde Felsefe, Kelam ve Tasavvuf Sempozyumu Bildirileri -II, 2020
Archaeological hammers and theories, 1983
Alcazaba. Revista Histórico-Cultural, 2011
Brain and Cognition, 2000
This paper highlights the neuropsychological sequelae of posteroventral pallidotomy (PVP) and deep brain stimulation (DBS) of the subthalamic nucleus (STN) and the internal segment of the globus pallidus (GPi) at 3/6 months postoperatively. Results are based on our extensive experience with PVP and our preliminary observations with DBS. Patients with borderline cognitive or psychiatric functioning risk postoperative decompensation. Nonlateralizing attentional and hemisphere-specific impairments of frontostriatal cognitive functions followed unilateral PVP. ''Frontal'' behavioral dyscontrol was observed in approximately 25% of patients. Three cases of staged bilateral PVP suggest that premorbid factors may predict outcome, although lesion size and ___location are also critical. Older patients are at risk for significant cognitive and behavioral decline after bilateral STN DBS, while GPi DBS may be safer.
Meta Gene, 2014
In Thailand, there are currently five recognized species members of the bubble-nesting Betta genus, namely Betta splendens, B. smaragdina, B. imbellis, B. mahachaiensis and B. siamorientalis. In 2010, we indicated the possibility, based on COI barcoding evidence, that there might be two additional species, albeit cryptic, related to the type-locality B. smaragdina in some provinces in the northeast of Thailand. In the present study, after a more extensive survey of the northeast, and phylogenetic analyses based on COI and ITS1 sequences, the B. smaragdina group may be composed of at least 3 cryptic species members. The phylogenetic positions of these B. smaragdina group members in the bubble-nesting bettas' tree together with those of their congeners have been consolidated by better DNA sequence quality and phylogenetic analyses. With a better supported tree, the species statuses of B. siamorientalis and the Cambodian B. smaragdina-like fish, B. stiktos, are also confirmed.
Marketing Letters, 2006
The linkage of customer satisfaction, customer retention, and firm profitability has been well established in the marketing literature, and provides ample justification as to why customer satisfaction measurement (CSM) has been a focal point in marketing decision making. Although aggregate market level research on understanding the determinants of customer satisfaction is abundant, CSM decisions at segment level are possible only if the individual or market segment differences in the formation of overall satisfaction judgments and subsequent heterogeneity in the role these various determinants play are understood. Based on expectancy-disconfirmation theory in customer satisfaction, we propose a maximum likelihood based latent structure factor analytic methodology which visually depicts customer heterogeneity regarding the various major determinants of customer satisfaction judgments involving multiple attributes, and provides directions for segment-specific CSM decisions. We first describe the proposed model framework including the technical aspects of the model structure and subsequent maximum likelihood estimation. In an application to
Journal of the American Society for Mass Spectrometry, 2008
Electron detachment dissociation (EDD) Fourier transform mass spectrometry has recently been shown to be a powerful tool for examining the structural features of sulfated glycosaminoglycans (GAGs). The characteristics of GAG fragmentation by EDD include abundant cross-ring fragmentation primarily on hexuronic acid residues, cleavage of all glycosidic bonds, and the formation of even-and odd-electron product ions. GAG dissociation by EDD has been proposed to occur through the formation of an excited species that can undergo direct decomposition, or eject an electron which then undergoes dissociation. In this work, we perform electron induced dissociation (EID) on singly-charged GAGs to identify products that form via direct decomposition by eliminating the pathway of electron detachment. EID of GAG tetrasaccharides produces cleavage of all glycosidic bonds and abundant cross-ring fragmentation primarily on hexuronic acid residues, producing fragmentation similar to EDD of the same molecules, but distinctly different from the products of infrared multiphoton dissociation or collisionally activated decomposition. These results suggest that observed abundant fragmentation of hexuronic acid residues occurs due to their increased lability when they undergo electronic excitation. EID fragmentation of GAG tetrasaccharides results in both even-and odd-electron products. EID of heparan sulfate tetrasaccharide epimers produces identical fragmentation, in contrast to EDD, in which the epimers can be distinguished by their fragment ions. These data suggest that for EDD, electron detachment play a significant role in distinguishing glucuronic acid from iduronic acid.
2000
For a long time, it has been known that the power spectrum of Barkhausen noise had a power-law decay at high frequencies. Up to now, the theoretical predictions for this decay have been incorrect, or have only applied to a small set of models. In this paper, we describe a careful derivation of the power spectrum exponent in avalanche models, and in particular, in variations of the zerotemperature random-field Ising model. We find that the naive exponent, (3 − τ )/σνz, which has been derived in several other papers, is in general incorrect for small τ , when large avalanches are common. (τ is the exponent describing the distribution of avalanche sizes, and σνz is the exponent describing the relationship between avalanche size and avalanche duration.) We find that for a large class of avalanche models, including several models of Barkhausen noise, the correct exponent for τ < 2 is 1/σνz. We explicitly derive the mean-field exponent of 2. In the process, we calculate the average avalanche shape for avalanches of fixed duration and scaling forms for a number of physical properties.
FACTORS AFFECTING THE LEARNING OF MATHEMATICS IN THE UNIVERSITIES IN MAKURDI LOCAL GOVERNMENT AREA OF BENUE STATE, 2019
Mathematics is of central importance to the modern society, it provides the language and analytical tools underpinning much of our scientific and industrial research and development. There is no doubt that mathematics is one of the basic pillars of any scientific progress, the teaching of modern mathematics has become necessary of the age of information revolution, as all inventions of cars, trains, computers, missiles, are governed by the laws of mathematics (Salamah, a., 2003). The importance of mathematics in scientific in scientific endeavor was explored by Herbert, k., (1978) who views mathematics as the Queen and servant of the science. Mathematical concepts, models and techniques are also key to many vital areas of the knowledge economy, including the finance, engineering and ICT industries. Mathematics is also crucially important for the employment opportunities and achievements of individual citizens”. (Smith, 2004) In recent years mathematics has increasingly been put under the spotlight as its potential in a vast array of sectors is gaining increased recognition among societies. In spite of this, much of the recent research into the mathematical standards of students in tertiary institutions has shown a decline in the standard of mathematics in this country and in many other countries around the world (Rylands and Coady 2009; MacGillivary 2009; Hourigand and O’ Donoghue 2007). Taking into consideration both the importance of mathematics in modern day society and the decline in standards of mathematics, it is now necessary to carry out a study on this. This hinged on some perceived factors such as: physical environment, students’ interest, teaching method/strategy among others. The physical environment of the school system includes the libraries, laboratories, technical workshops; class size, hostel accommodation are factors that affect students’ academic performance (Ajayi, 2001 and Oluchyukwo, 2000). Also other factors include-teachers’ qualification, quality of instruction and attitude (Caleb, 2001 Buker & Ibi, 2003): socio-psychological factors (Umoninyang &Okpala, 2001) Hence the school environment remains an important premise that should be studied and well managed to enhance students’ academic performance in mathematics. The issue of poor academic performance of students in Nigerian universities has been of much concern to the government, parents, teachers and even students themselves. The quality the quality of education not only depends on the lecturers as reflected in the performance of their duties, but also in the effective coordination of the school environment (Ajao, 2001) The extent to which student’s learning could be enhanced depends on the ___location of the students from the school campus as students who stay closer to the school campus will he more available in school on time than those that stay further away from the school campus as the case may be; also the structure of their classroom, availability of instructional and laboratory facilities and accessories. It is believe that a well planned school will gear up expected outcome so education that will facilitate good social, political and economic emancipation, effective teaching and learning process and academic performance of the students. Students’ interest (anxiety)in mathematics is also a very vital factor. According to Aahcraft, M.H.,(2002), mathematics anxiety is a feeling of tension, apprehension of fear that interferes with one’s performance in mathematics. Many other factors like student’s gender, socio-economic background, prior performance and classroom influences including the student’s opportunities to learn within the classroom which is often a measure of time exposed to a learning situation, the instruction practices that are employed in the classroom contributes greatly in determining students’ readiness to learn. To complement these studies, the focus of this present research will be to examine the afore mentioned factors as they affect students learning of mathematics in the universities in Makurdi Local Government Area of Benue State in Nigeria.
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