Historical Text and Historical Archaeology: Hunting the Narrative of Kievan Rus

This paper focuses on the historical narrative of Kievan Rus between 860 to 1240 and the importance of historical archaeology in order to gain a clearer understanding of its history. Very few sources written in the 9th to 13th centuries in Rus survive today. The Primary Chronicle is the most widely known and available account of the history of Rus for historians to use. However, scholars utilize the chronicle with caution because the original oldest surviving chronicle was written almost two centuries after the first dated entry. We can expect that not everything written in the chronicles was accurate and that changes would have been made. Since the Primary Chronicle is a fundamental piece of literature for historians studying the history of Kievan Rus, I will be closely examining passages from Samuel Cross’s translation of the Primary Chronicle to understand the once-official narrative and identify archaeological evidence that either supports or challenges the official narrative. I will discuss issues regarding: the so-called Norman Controversy, Khazar influence in Kiev, construction and utilization of boats, traditional Scandinavian boat graves, the organization of the city of Kiev, and literacy among non-elite townspeople

The Impact of Dynamic Furniture on Classroom Performance: A Pilot Study

The purpose of this study was to understand how dynamic classroom furniture may impact classroom performance such as attention, work neatness, and work completion in a second grade general education classroom of 19 students. All students in the classroom were included in this study to understand the implications of environmental modifications on the learning process in general education settings. A descriptive method provided information about the interaction of dynamic furniture on identified learning components. Three different dynamic furniture options were provided: Zuma chairs®, Disc‘O’Sits® (inflated seat cushions), and standing desks with the Original FootFidget®. The class was randomly divided into four groups of up to five students. The groups were rotated through the furniture, allowing one week per group with each type of furniture. The Sensory Processing Measure (Parham & Ecker, 2007) was used to screen the sensory processing of students and a daily self-report rubric provided data on attention behaviors and perception of the dynamic furniture options. Data were graphed and visually analyzed for differences in responses to types of furniture. Responses on the rubrics indicate that the different types of furniture impacted different components of learning in a variety of ways. The data from this study indicates that no one type of furniture provides the same effect for all elementary students, but rather that personal characteristics may dictate the best match for focus, work completion, and neatness

Characterisation of a novel reverse-biased PPD CMOS image sensor

A new pinned photodiode (PPD) CMOS image sensor (CIS) has been developed and characterised. The sensor can be fully depleted by means of reverse bias applied to the substrate, and the principle of operation is applicable to very thick sensitive volumes. Additional n-type implants under the pixel p-wells, called Deep Depletion Extension (DDE), have been added in order to eliminate the large parasitic substrate current that would otherwise be present in a normal device. The first prototype has been manufactured on a 18 μm thick, 1000 Ω .cm epitaxial silicon wafers using 180 nm PPD image sensor process at TowerJazz Semiconductor. The chip contains arrays of 10 μm and 5.4 μm pixels, with variations of the shape, size and the depth of the DDE implant. Back-side illuminated (BSI) devices were manufactured in collaboration with Teledyne e2v, and characterised together with the front-side illuminated (FSI) variants. The presented results show that the devices could be reverse-biased without parasitic leakage currents, in good agreement with simulations. The new 10 μm pixels in both BSI and FSI variants exhibit nearly identical photo response to the reference non-modified pixels, as characterised with the photon transfer curve. Different techniques were used to measure the depletion depth in FSI and BSI chips, and the results are consistent with the expected full depletion

Preventing Delinquency and Promoting Academic Success among School-Age African American Males

This study explores delinquency related factors that have a relationship with educational outcomes for Black males. The findings suggest that reducing behaviors associated with delinquency improves academic performance across all races

The African Pollen Database (APD) and tracing environmental change: State of the Art

International audienc

Implementation and performance of the pseudoknot problem in sisal

The Pseudoknot Problem is an application from molecular biology that computes all possible three-dimensional structures of one section of a nucleic acid molecule. The problem spans two important application domains: it includes a deterministic, backtracking search algorithm and floating-point intensive computations. Recently, the application has been used to compare and to contrast functional languages. In this paper, we describe a sequential and parallel implementation of the problem in Sisal. We present a method for writing recursive, floating-point intensive applications in Sisal that preserves performance and parallelism. We discuss compiler optimizations, runtime execution, and performance on several multiprocessor systems

Measurement of the temperature-dependent speed of sound and change in Gruneisen parameter of tissue-mimicking materials

Knowledge of the temperature dependence of the material properties of tissue-mimicking materials is useful or essential for many applications. This includes photoacoustic thermometry where the temperature dependence of the Grüneisen parameter of tissues leads to changes in the recorded photoacoustic signal amplitude with temperature. Here, a setup is described that can measure the temperature dependence of the speed of sound and photoacoustic conversion efficiency (μ a Γ) of tissue-mimicking materials. Agar-based phantoms, copolymer-in-oil, gel wax, PVCP, silicone and water were characterised in the newly developed setup for temperatures between 22°C and 50°C. This information provides a valuable resource for material characterisation and future development of tissue-mimicking materials