Introduction. The technology for producing hot-formed powder steel is one of the most energy-intensive in powder metallurgy, which includes a large number of operations. The study of the influence of technological modes on the final properties of the part is an urgent task. Developed by the scientific team under the leadership of Yu. G. Dorofeev at the end of the XX century, the technology of manufacturing hot-formed powder steels is currently one of the main ones in the production of high-density products. However, the use of new materials that improve the mechanical properties of products requires a modern approach to analyzing the quality of interparticle splicing of powder particles. The influence of the following technological factors on the formation of qualitative interparticle splicing was established: the blank density, the granulometric composition of the initial charge, the temperature and holding time of the blank during heating, the ratio of its dimensions, the deformation rate. The study objective is to analyze the effect of a graphite-containing component on the mechanical properties of hot-formed powder alloys due to the formation of high-quality interparticle splicing.Materials and Methods. The work used domestic and foreign powders produced by PAO Severstal and the Swedish company Höganäs with the addition of carbon GC-1 (GOST 4404-78). Hot stamping was carried out on a crank press of the K2232 model with a maximum force of 1600 kN. The heating temperature of the workpieces varied between 800-1200 ºC.Results. As a result of the experiments, the influence of the sintering duration on the mechanical properties of materials was established. The reason for the change in mechanical properties are local inclusions of graphite, which did not have time to homogenize as a result of prolonged sintering. Technological modes of hot stamping for steels have been developed that affect the preservation or destruction of the pre-formed contact interparticle surface.Discussion and Conclusion. The studies have shown that additional hot plastic deformation contributes to the formation of intracrystalline fusion on the entire contact surface. The addition of graphite to the charge improves splicing for alloyed iron powder and practically does not affect the use of alloyed and unalloyed iron powder.

Myofascial pain syndrome is a complex psychophysiological process determined by nonspecific lesion of skeletal muscles with formation of trigger points in tense muscles, which be come generators of pathological reflex system. The role of myo fascial structures in formation of a back pain syndrome was identified. It was shown that biocontrolled mechanokinesi therapy is a promising method of drugfree treatment for pa tients with myofascial pain syndrome.

Новосибирский НИИ травматологии и ортопедии 2 Кемеровский центр рефлексотерапии «Шень-Дао»Biological feedback in the treatment of back myofascial pain syndrome V.P. Mikhailov, M.V. Kovtun, A.A. Kuzmichev, E.A. Golovko Objective. To study the effect of therapeutic exercise with biological feedback on a functional status of back muscles in patients with myofascial pain syndrome. Material and Methods. Twenty patients (16 females, 4 males) aged 19 to 56 years having back pain of different localization were examined. Clinical neurological examination was performed with the assessment of psychic sphere, sleep quality and vegetative disorders, social adaptation, stress level, and pain. All patients were administered monotherapy (therapeutic exercise with biological feedback) 20-40 minutes daily during four weeks. After the treatment course completion, all patients underwent repeated and catamnestic (three weeks later) examination. Results. Apparatus therapeutic exercise with biological feedback reduced the intensity of pain syndrome and muscle tension level which had a positive effect on patients' quality of life. Subjective estimate of treatment was good in 11 (55 %) and satisfactory in 9 (45 %) patients. Conclusion. Therapeutic exercise with biological feedback should be included to multimodal therapy of myofascial pain syndrome, especially in the initial stage. Key Words: biological feedback, myofascial pain syndrome.Hir. Pozvonoc. 2008;(4):37-41.Цель исследования. Изучение влияния аппаратной ле-чебной гимнастики с биологической обратной связью на функциональное состояние мышц спины у пациентов с миофасциальными болевыми синдромами. Материал и методы. Обследовано 20 пациентов в возрасте от 19 до 56 лет (16 женщин и 4 мужчин) с болью в спине различной локализации. Использовали клинико-невроло-гический метод исследования, оценивали состояние пси-хической сферы, качество сна и вегетативные нарушения, социальную адаптацию, уровень стресса, боли. Всем па-циентам назначали монотерапию (лечебная гимнастика с биологической обратной связью) 20-40 мин ежедневно в течение четырех недель. После завершения курса тера-пии проводили повторное и катамнестическое (через три недели) исследования. Результаты. Благодаря аппаратной лечебной гимнастике с биологической обратной связью снижена интенсивность болевого синдрома и степень выраженности мышечно-го напряжения, что положительно отразилось на качест-ве жизни пациентов. Субъективно 11 (55 %) пациентов оценили результат лечения как хороший, 9 (45 %) -как удовлетворительный. Заключение. Целесообразно включение аппаратной лечеб-ной гимнастики с биологической обратной связью в ком-плексную терапию миофасциальных болевых синдромов, особенно в начальном периоде заболевания. Ключевые слова: биологическая обратная связь, миофас-циальный болевой синдром.Боль в спине -одна из наиболее час-тых жалоб, с которой пациенты обра-щаются к врачу. Около 20 % взрослого населения страдает от периодически повторяющихся болей в спине дли-тельностью более трех дней. Чаще все-го это люди трудоспособного ...