Temperature profile of graphite surface burning in a stream of oxygen

Using methods for the objective measurement of the spectrum line reversal temperature in burning gases, the temperature profile at a graphite surface burning in a stream of oxygen was measured. From the behavior of the reversal temperature, it follows that particles in long-lived, high-energy states are present in the burning gas, and these bring about an overexcitation of the atomic species emitting the reversal line. Qualitative measurements show that a temperature maximum occurs at the expected distance of 1-2 mm from the graphite surface

Lightweight multiple output converter development

A high frequency, multiple output power conditioner was developed and breadboarded using an eight-stage capacitor diode voltage multiplier to provide +1200 Vdc, and a three-stage for -350 Vdc. In addition, two rectifier bridges were capacitively coupled to the eight-stage multiplier to obtain 0.5 and 0.65 a dc constant current outputs referenced to +1200 Vdc. Total power was 120 watts, with an overall efficiency of 85 percent at the 80 kHz operating frequency. All outputs were regulated to three percent or better, with complete short circuit protection. The power conditioner component weight and efficiency were compared to the equivalent four outputs of the 10 kHz conditioner for the 8 cm ion engine. Weight reduction for the four outputs was 557 grams; extrapolated in the same ratio to all nine outputs, it would be 1100 to 1400 grams

Chrysalis

I owe a great deal of thanks to both the clarinetists and Dr. Curlette for putting a great deal of time into this piece. Chrysalis is quite challenging, both technically (because of the complex rhythms and counter-rhythms) and musically (because of the unique harmonic language). The idea behind Chrysalis is that the tiny phrases, syncopations, and runs would create the picture of a thousand tiny little pieces being changed and rearranged, much like how God transforms a caterpillar into a butterfly. Also like a caterpillar, near the end of the piece, the quartet goes through a transformation as well, as the first Bb Clarinet changes to the higher Eb Clarinet. The last idea you will hear is the butterfly flitting out of sight, as the main motive becomes thinner and thinner, until it “disappears into the distance.

Disablement, Gender, and Deafhood among the Negev Arab-Bedouin

A high incidence of deafness occurs among the native Arab inhabitants of the Negev (the southern arid region of present-day Israel). Dynamics both within the Bedouin population, as well as Bedouin encounters with state services and the Israeli-Jewish deaf community, are leading to the gradual emergence of a new sense of Deafhood among the Negev Bedouin. This paper concerns the differential impact of these processes on deaf Bedouin women and men. The first aim of this paper is to consider the state of deaf people among the Negev Bedouin. The second is to provide an analysis of the intersection of deafness and gender, focusing on the way marriage and schooling inform the lives of deaf Bedouin women and men, and shape their different lived experience and structure of opportunities

The Relationship of Rehabilitation Therapy Clients and Grit: A Pilot Study

Client experience is an important consideration in physical and occupational therapy (known as rehabilitation therapy.) The personality trait of grit has been studied in many different settings and populations and could have an impact on rehabilitation therapy clients’ perceptions and experiences. The purpose of this study is to identify the relationship between scores on Dr. Angela Duckworth’s Grit Scale (that identifies the presence and strength of grit) and perceptions of experiences by rehabilitation therapy clients. Seven males and twelve females (age: 56.78 ± 15.83) participated in this study. The Grit Scale was used to assess participants’ grit. Multiple-choice questions were used to collect data on participants’ experiences in rehabilitation therapy. This study found moderate positive correlations (r = .432, p = .065) between grit and positive perceptions of progress in therapy, as well as between grit and positive reasons behind completing assigned at-home exercises (r = .45, p \u3c .05), an important aspect of rehabilitation success. Studying grit is important to the fields of physical and occupational therapy because clients with different levels of grit may view their challenges in therapy differently accordingly and understanding grit in clients may help therapists improve client experience and progress in treatment. Findings from this study can be used to help improve rehabilitation therapy clients’ experiences

Above 15-year follow-up of single machined Brånemark implants

Background: Since the late 1980s dental implants have been used in the indication of single-tooth replacement. Aim: The aim of this study was to evaluate the radiographical and clinical outcome of single-machined Bra°nemark implants with at least 15 years of follow-up. Methods: Fifty-one patients who received 63 single implants between 1987 and 1994 were randomly selected. In this patient group three implants failed (4.8%), leaving 60 implants to be clinically investigated. Mean interproximal probing depth, bleeding and plaque index were measured around each implant. Peri-apical radiographs were compared for marginal bone level between baseline (¼within 6 months after abutment connection) and 2–4 years, 5–8 years and 15–22 years of follow-up. Mean interproximal bone level was measured from the implant shoulder as a reference point. Overall changes in marginal bone level were analyzed with the Friedman test and 2-by-2 comparison between time points was evaluated with the Wilcoxon signed ranks test. Results: The group consisted of 29 males and 22 females with a mean age of 24 years (range 14.7–57.4) at implant placement. Mean follow-up time was 18.5 years (range 15–22). Mean probing depth was 3.9 _ 1.27mm (range 2–10.3). Bleeding and plaque indices were 1.2 _ 0.81 and 0.2 _ 0.48, respectively. Mean bone level after 15–22 years was 1.7 _ 0.88mm (range _0.8 to 5). There was no correlation found between radiographic bone level and probing depth. The Friedman test indicated a statistically significant change in marginal bone level between time points (P < 0.05). Wilcoxon signed ranks test showed a statistically significant difference between baseline and all other time points. After 2–4 years no statistically significant differences could be found. All but one implants (98.3%) were within the currently accepted success criteria corresponding to a maximum accepted bone loss of 4.3mm after 15 years. If one accepts a mean bone level of 2.1mm from the implant shoulder (¼2nd thread), 81.7% of the implants are successful. If a mean interproximal probing depth of 5mm is accepted, 91.7% of the implants are successful. If both these criteria are combined, 76.7% are successful. Conclusions and clinical implications: The machined Bra°nemark implant used as a single-tooth replacement is a predictable solution with high clinical survival and success rates. In general, a steady state bone level can be expected over decades. New criteria for long-term implant success should be determined