So-journeying: creating sacred space in education

This research questions current taken-for-granted meanings given to school, education, teaching and curriculum from an African/African American perspective. This inquiry is based on my experiences as an African American woman curriculum theorist committed to the education of African American youth. Drawing on the lifework of Sojourner Truth, a nineteenth century African American woman abolitionist and human rights activist, this work seeks to explore aspects of both African/African American-centered education and curriculum theory as a means of informing understandings of school, education, teaching and curriculum. My research question is: How does Sojourner Truth inform curriculum theory? This inquiry is a self-exploration and self-evaluation from African/African American-centered education through curriculum theory inspired by the call of Sojourner Truth. Referencing literature relative to Sojourner Truth, African/African American-centered education and curriculum theory, this dissertation makes connections between Truth’s lived experiences and its relevance to African/African American-centered education and curriculum theory. Based on Sojourner Truth’s African/African American world view as well as my own, I developed call-and-response in the context of I~We as my methodology which honors the communion, community, and communication of All-That-Exists. Using this as well as autobiographical methods, I explored an African world view, African/African American-centered education, curriculum theory as well as spirituality in education. The results of this inquiry suggest: 1) The role of spirituality in education needs to be reexamined so that the spirit of life can become the focus of school, education, teaching, and curriculum. 2) An African/African American world view of life is a guide, source, and resource for school, education, teaching, and curriculum; 3) To challenge limited, static contemporary approaches to learning, so-journeying is an authentic, organic process of and approach to learning which reflects learning as lifelong and rooted in life; 4) Following the belief that human beings are spiritual beings having a human experience, education necessitates creating sacred space

Giant Electron-hole Charging Energy Asymmetry in Ultra-short Carbon Nanotubes

Making full usage of bipolar transport in single-wall carbon nanotube (SWCNT) transistors could permit the development of two-in-one quantum devices with ultra-short channels. We report on clean $\sim$10 to 100 nm long suspended SWCNT transistors which display a large electron-hole transport asymmetry. The devices consist of naked SWCNT channels contacted with sections of SWCNT-under-annealed-gold. The annealed gold acts as an n-doping top gate which creates nm-sharp barriers at the junctions between the contacts and naked channel. These tunnel barriers define a single quantum dot (QD) whose charging energies to add an electron or a hole are vastly different ($e-h$ charging energy asymmetry). We parameterize the $e-h$ transport asymmetry by the ratio of the hole and electron charging energies $\eta_{e-h}$. We show that this asymmetry is maximized for short channels and small band gap SWCNTs. In a small band gap SWCNT device, we demonstrate the fabrication of a two-in-one quantum device acting as a QD for holes, and a much longer quantum bus for electrons. In a 14 nm long channel, $\eta_{e-h}$ reaches up to 2.6 for a device with a band gap of 270 meV. This strong $e-h$ transport asymmetry survives even at room temperature

Effect of time lapse on the diagnostic accuracy of cone beam computed tomography for detection of vertical root fractures

Accurate and early diagnosis of vertical root fractures (VRFs) is imperative to prevent extensive bone loss and unnecessary endodontic and prosthodontic treatments. The aim of this study was to assess the effect of time lapse on the diagnostic accuracy of cone beam computed tomography (CBCT) for VRFs in endodontically treated dog’s teeth. Forty-eight incisors and premolars of three adult male dogs underwent root canal therapy. The teeth were assigned to two groups: VRFs were artificially induced in the first group (n=24) while the teeth in the second group remained intact (n=24). The CBCT scans were obtained by NewTom 3G unit immediately after inducing VRFs and after one, two, three, four, eight, 12 and 16 weeks. Three oral and maxillofacial radiologists blinded to the date of radiographs assessed the presence/absence of VRFs on CBCT scans. The sensitivity, specificity and accuracy values were calculated and data were analyzed using SPSS v.16 software and ANOVA. The total accuracy of detection of VRFs immediately after surgery, one, two, three, four, eight, 12 and 16 weeks was 67.3%, 68.7%, 66.6%, 64.6%, 64.5%, 69.4%, 68.7%, 68% respectively. The effect of time lapse on detection of VRFs was not significant (p>0.05). Overall sensitivity, specificity and accuracy of CBCT for detection of VRFs were 74.3%, 62.2%, 67.2% respectively. Cone beam computed tomography is a valuable tool for detection of VRFs. Time lapse (four months) had no effect on detection of VRFs on CBCT scans. © 2016, Associacao Brasileira de Divulgacao Cientifica. All rights reserved