98 research outputs found

    Characterizaton of Nb75Ta for Hix decomposition process

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    Nb7.5Ta, a candidate refractory material for use in the HI, decomposition process, has been tested for evaluation of its tensile properties and corrosion resistance. The results of tensile testing within a temperature range of ambient to 400°C revealed a gradual drop in tensile strength with increasing temperature. However, reduced failure strain was observed at temperatures up to 300°C, suggesting the occurrence of dynamic strain aging (DSA) behavior. The characterization of the tensile specimens by transmission electron microscopy showed somewhat higher dislocation density at 300°C that could be the result of the DSA effect. Corrosion studies under a slow strain rate condition in an acidic solution exhibited enhanced cracking tendency at 90°C, suggesting a detrimental effect of higher temperature on the cracking susceptibility. No failures were observed under a constant-load condition. An application of a cathodic controlled potential to the test specimen resulted in enhanced cracking tendency in terms of failure strain. The morphology of failure, determined by a scanning electron microscope, was ductile in all tested specimens

    Enhancing the built heritage of Singapore

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    Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Architecture, 2000.Includes bibliographical references (leaves 83-85).The thesis looks at Conservation in Singapore: how it started, what were its initial goals, how these changed over years, and the impacts of the same. These questions are dealt with by studying the three conservation districts of Chinatown, Little India and Kampong Clam, which were the original settlements for the three main populations namely, the Chinese, Indian and Malay respectively. The one thing common to all these different populations is the history of Singapore and the built fabric which represent this history. The three areas represent the unique cultures, lifestyles and traditions of the different populations that give these areas the character they possessed until conservation came about. The built fabric has been saved, but does it represent the true essence of Place? The three districts have undergone rapid changes in the last two decades and the process is questionable. It has resulted in sociocultural and economic imbalances largely due to a strong hand by the State. The thesis along with these issues, also addresses the question of whether the conservation effort is catering to the right people. Finally, based on the analysis of these impacts, current guidelines and policies, the thesis proposes strategies for making these conservation districts culturally more significant & at the same time economically feasible.bu Sunitha Kondur Raju.S.M

    Formation of Cognitive Flexibility as a Basic Competence of the Future Teachers’ Multicultural Personality

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    The article presents the results of research work on the formation of cognitive flexibility (CF) as an essential competence of the future teachers’ multicultural personality. It has been shown that various branches of knowledge (psychology, philosophy, clinical medicine, pedagogy, and others) contribute to the scientific and theoretical substantiation of CF, which is included in the TOP-10 most requested competencies in the XXI century. Based on the analysis of the essence and nature of the future teachers’ multicultural personality, the hypothesis that the competence of CF should become a vital component of personal development was put forward. To test this hypothesis, a pedagogical experiment was organised, which covered 33 future teachers studying "Educational, Pedagogical Sciences" at the Precarpathian National University (Ivano-Frankivsk, Ukraine). The experiment was conducted in four stages: on the first preparatory stage, a defined program of experimental activities was made; on the second statement stage, the diagnosis of future teachers’ CF levels was set on the basis of the developed prognostic tools (the Questionnaire Cognitive flexibility was created to define the main features of CF as a component of multicultural competence of the future teacher, tests); on the third formative stage the approbation of our methodology for the formation of CF was carried out, which had no analogues in modern education and pedagogy (this was implemented on the basis of our own special course "Cognitive flexibility and multicultural competence of the future teacher", which was held as a training seminar); on the fourth control stage the results of the experiment were determined. They showed that the indicators of CF formation of future teachers at a high level increased from 9.1% to 41.5% (4.7 times), at the medium level they decreased from 63.6% to 53% (1.2 times). At the low level, they changed from 27% to 5.5% (4.9 times) according to four defined criteria (cognitive abilities, adaptive abilities, flexibility of thinking, and emotional flexibility). This proves the effectiveness of the authors’ methodology for the formation of CF as a basic competence of the multicultural personality of the future teacher. It can be widely used in the training of specialists in various specialities

    Suggestions for plantatıin of arid and semi-arid areas and control of insect pest in regard with the global climatic change (Çankırı province example)

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    Ormancılık faaliyetleri açısından Ülkemiz, yarıkurak iklim şartları nedeniyle hassas bir ekosistem kuşağı üzerinde yer almakta olup, Karadeniz kıyı bölgesi hariç kurak ve yarı kurak bir iklim etkisi altındadır. İç Anadolu bölgesini iklim bakımından karakterize edebilen Çankırı ili, 417.7 mm yıllık ortalama yağışı, 11.1°C ortalama sıcaklığı ile yarıkurak alan niteliğindedir. Bu özellikleri nedeniyle, yapılacak ağaçlandırma çalışmalarının başarısında, iklim koşulları yanında, uygun ağaç türlerinin seçilerek fidan yetiştirilmesi, diri örtü mücadelesi, toprak işlemesinin tekniğine uygun olarak yapılması, kültür bakımı tedbirleri ile hastalık ve zararlı böceklerle biyoteknik mücadele büyük önem taşımaktadır. Bu çalışma, Çankırı ilinin de yer aldığı kurak ve yarıkurak alanlarda yapılacak ağaçlandırma çalışmalarını; mevcut bilgi ve deneyimler ile bu konuda yapılan araştırmaların ışığı altında değerlendirmek üzere ele alınmıştır.Turkey is at a sensitive ecosystem belt due to semi-arid climatic conditions in regard to forestry and under an arid and semi-arid climate with the exception of the Blacksea region. Çankırı province that may characterize the Middle Anatolian Region is a semi-arid region because of 417.7 mm annual rainfall and 11.1°C average temperature. Within these conditions, in order to be successful at afforestation studies; breeding of saplings of suitable tree species, weed control, appropriate cultivation techniques, cultural tending and biotechnical control measures for insect pests and diseases have great importance. This study discusses afforestation studies in arid and semi-arid areas such as Çankırı by means of evaluation of the current knowledge, experiences and researches regarding to this subject

    Ботулинотерапия в лечении дистонического сколиоза при генерализованной дистонии (клиническое наблюдение)

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    Dystonic scoliosis as one of the forms of generalized dystonia is a highly disabling form of dystonia, which can lead to damage to internal organs (lungs, heart) and the peripheral nervous system, including the spinal cord. Almost always, those muscles that are involved in the formation of a dystonic posture in generalized dystonia have not been studied in terms of the effectiveness of treatment with botulinum toxin type A and are not reflected in the instructions. As a result, there is no understanding of the general motor interaction with differentiation into targeted and non-targeted muscles, administration doses and control methods.The aim of the work was to evaluate the efficacy and tolerability of high doses of botulinum toxin type A in dystonic scoliosis, as well as to present the introduction of botulinum toxin type A using ultrasound and electromyographic control. We have described a clinical case of a 19-year-old patient suffering from generalized dystonia with S-shaped dystonic scoliosis of the III degree. Deep brain stimulation was recommended as a treatment for the patient. During the waiting period for the timing of the operation, we attempted symptomatic therapy using the drug incobotulotoxin A. Over the next year and a half, 700 units of botulinum toxin type A were administered under ultrasound and electromyographic control every 3–4 months. As a result, treatment of trunk dystonia in the patient during the observation period led to a clinically significant decrease in the degree of curvature (from 37° to 27°, from III to II degree of scoliosis) in the absence of undesirable effects of the drug, including generalized muscle weakness. According to the repeated conclusion of the council of neurosurgeons, surgical intervention is not indicated for the patient due to the positive effect of the introduction of botulinum toxin type A.Дистонический сколиоз как одна из форм генерализованной дистонии является высокоинвалидизирующей формой дистонии, которая может приводить к повреждению внутренних органов (легких, сердца) и периферической нервной системы, включая спинной мозг. В большинстве случаев мышцы, которые участвуют в формировании дистонической позы при генерализованной дистонии, исследуются мало в плане эффективности лечения препаратами ботулинического токсина типа А и, как следствие, не отражены в инструкциях. В результате отсутствует методическое понимание общего двигательного взаимодействия с дифференцировкой на таргетные и не таргетные мышцы, дозы введения и методов контроля.Цель настоящей работы – оценить эффективность и переносимость высоких доз ботулинического токсина типа А при дистоническом сколиозе, а также представить возможности введения ботулинического токсина типа А с использованием ультразвукового и электромиографического контроля.Нами описан клинический пример пациента 19 лет, страдающего генерализованной дистонией с С-образным дистоническим сколиозом III степени. В качестве лечения пациенту была рекомендована глубокая стимуляция головного мозга. В период ожидания сроков операции нами была предпринята попытка симптоматической терапии с использованием препарата инкоботулотоксина А. В течение последующих полутора лет введение 700 ЕД ботулинического токсина А проводили под ультразвуковым и электромиографическим контролем каждые 3–4 мес. В результате у пациента за период наблюдения лечение дистонии туловища привело к клинически достоверному снижению градуса искривления (с 37 до 27°, с III до II степени сколиоза) при отсутствии нежелательных явлений действия препарата, включая генерализованную мышечную слабость. Согласно повторному заключению консилиума нейрохирургов, оперативное вмешательство пациенту не показано ввиду положительного эффекта от введения ботулинического токсина типа А
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