A Study of the Pore Surface State of Porous TiNi-based Materials Obtained by SHS at Various Ignition Temperatures

Structural features of porous TiNi-based materials obtained by SHS at temperatures of synthesis beginning of400 Cand600 Chave been investigated. It is found that finely porous material with a porosity P=75 % was obtained at the temperature of400 C. A surface of pore walls contains a dendritic relief, oxycarbidenitride layer and a multitude of secondary phase particles. Phase and chemical composition of the material is non-uniform. SHS material obtained at the synthesis beginning temperature of600 °Cis characterized as a coarse-porosity one P=65 %. Nano- and micropores are practically absent. The oxycarbidenitride surface layer with a variable thickness is substantially free of secondary inclusions due to the more complete processes of alloy formation. This layer has an own substructure based on carbonitride and oxynitride layers

Features of Cells Integration on TiNi-based Porous Scaffold

Developing of standard population of cells — line fibroblasts 3T3 in porous structure of incubator having fixed composition, porousness and pore size distribution has been studied. The volume of scaffold space was shown to determine the potential cell division and its function. The characteristic integration of fibroblasts in porous incubators from TiNi-based alloy having different volumes was analyzed. The relation of colonization by cells and growth of tissues in porous samples from titanium nickel depending on depth of penetration is determined

Study of Correlation of Structural Features in the Porous TiNi-based Materials Obtained by Sintering with the Integration Process of Bone Marrow Cell Populations

The structural features of porous-permeable TiNi-based materials obtained by sintering in depending on the temperature have been studied. It is shown that a material obtained at the sintering temperature of T2=1250 °C and time t=40 min has an optimal degree of sintering and relates to finely porous materials with the porosity of 55 %. A positive dynamics of development of bone marrow cells in the TiNi-based sintered material was proved. It is noted that the finely porous macrostructure with developed rough surface of pore walls provides favorable conditions for development of cell populations. When the 21 day of cultivation a dense formed tissue on basis of bone marrow cells observes in the material pores

Structural Features of TiNi-based Textile Materials and Their Biocompatibility with Cell Culture

This study investigates the structural features of TiNi-based textile materials. It is established that woven materials have a regular cellular structure, while knitted mesh materials are characterized by presence of cells with various sizes both in the longitudinal and cross directions. The surface oxide layer of threads has a microporous structure that provides the improved adaptation in organism tissues. It is shown that the fibroblast colonization rate of the knitted mesh implants depends on the cell size and quantity of mesh knots. Smaller cells are quicker colonized. Mesh knots are the centers of the cell cling. The feature of cell interaction with the tread surface of various sizes is analyzed

Surgical Treatment of Fractures of Long Tubular Bones of Elderly and Old-Aged People with the Usage of Shape Memory Implants

The article's abstract is no available

Measurement of the Dalitz plot slope parameters for K- -> pi0 pi0 pi- decay using ISTRA+ detector

The Dalitz plot slope parameters g, h and k for the K- -> pi0 pi0 pi- decay have been measured using in-flight decays detected with the ISTRA+ setup operating in the 25 GeV negative secondary beam of the U-70 PS. About 252 K events with four-momenta measured for the pi- and four involved photons were used for the analysis. The values obtained g=0.627+/-0.004(stat)+/-0.010(syst), h=0.046+/-0.004(stat)+/-0.012(syst), k=0.001+/-0.001(stat)+/-0.002(syst) are consistent with the world averages dominated by K+ data, but have significantly smaller errors.Comment: LaTeX, 10 pages, 8 eps-figures, update of IHEP 2002-1

Determination of the high-twist contribution to the structure function xF3νNxF^{\nu N}_3

We extract the high-twist contribution to the neutrino-nucleon structure function $xF_3^{(\nu+\bar{\nu})N}$ from the analysis of the data collected by the IHEP-JINR Neutrino Detector in the runs with the focused neutrino beams at the IHEP 70 GeV proton synchrotron. The analysis is performed within the infrared renormalon (IRR) model of high twists in order to extract the normalization parameter of the model. From the NLO QCD fit to our data we obtained the value of the IRR model normalization parameter $\Lambda^2_{3}=0.69\pm0.37~({\rm exp})\pm0.16~({\rm theor})~{\rm GeV}^2$. We also obtained $\Lambda^2_{3}=0.36\pm0.22~({\rm exp})\pm0.12~({\rm theor})~{\rm GeV}^2$ from a similar fit to the CCFR data. The average of both results is $\Lambda^2_{3}=0.44\pm0.19~({\rm exp})~{\rm GeV}^2$.Comment: preprint IHEP-01-18, 7 pages, LATEX, 1 figure (EPS

Двуствольная энтеростомия с компрессионным анастомозом у новорожденных и детей раннего возраста

BACKGROUND: Staged treatment of small bowel diseases involves the formation of an enterostomy. BishopKoop T-anastomosis and Mikulicz double-barreled enterostomy with compression clamp are widely applied. The disadvantages of Mikuliczs can be eliminated using a clip of titanium nickelide with shape memory instead of a clamp. AIM: This study aimed to evaluate the efficacy and safety of a titanium nickelide device in double-barreled enterostomy and compare the results of treatment with a T-anastomosis. MATERIALS AND METHODS: The study included newborns and infants. The clip was applied on 958 days postoperatively. Differences were accepted as significant at p 0.05. RESULTS: Since 2000, enterostomy was performed in 79 children: 12 (15.2%) had T-anastomoses, 44 (55.7%) had double-barreled stomas, and 18 (40.9%) had a titanium nickelide clip. In the study groups, stomas were applied for ileus, atresia, and aganglionosis. In the group of double-barreled enterostomies with a clip, the stoma was closed later (p = 0.027) and the operation time was short (p = 0.013). In the T-anastomosis group, parenteral nutrition was required for a longer period (p = 0.018). Self-removal of the clip and appearance of the stool occurred on days 5 and 13. Compression anastomosis was obtained in 83.3% and stoma closure outside in 73.3%. With a double-barreled enterostomy, hepatic failure (p = 0.018) and anastomosis dysfunction (p = 0.046) were less common. T-anastomosis revealed an increase in the incidence of CDC II (p = 0.013) and III (p = 0.015) complications. DISCUSSION: The results reflect the safety of the presented method in comparison with the T-anastomosis, since the operation time and duration of the parenteral nutrition are reduced, invasive treatment is less often required for complications, and anastomosis dysfunction rarely occurs. CONCLUSIONS: Double-barreled enterostomy with a compression clip is an effective and safe alternative to T-anastomosis in children aged 1 year. The formed compression anastomosis allows closure of the stoma by suturing its outer part. The conditions for the formation of the anastomosis are the patency of the distal sections and bowel diameter 1 cm.Актуальность. Этапное лечение заболеваний и повреждений тонкой кишки заключается в формировании различных видов энтеростом. Распространены Т-анастомоз по Bishop Koop и двуствольная энтеростомия по Микуличу с наложением раздавливающего зажима. Недостатки последней возможно устранить, используя вместо зажима клипсу из никелида титана с памятью формы. Цель. Оценка эффективности и безопасности применения устройства из никелида титана с памятью формы в двуствольной энтеростоме и сравнение результатов с Т-анастомозом. Материалы и методы. В исследование включены дети возрастом до 1 года. Наложение клипсы проводили на 958-е сутки послеоперационного периода. Значимыми приняты различия при p 0,05. Результаты. С 2000 г. энтеростомия выполнена у 79 детей: Т-анастомозы у 12 (15,2 %), двуствольные у 44 (55,7%), с наложением клипсы у 18 (40,9 %). В исследуемых группах стомы накладывались по поводу илеуса, атрезии и аганглиоза. В группе двуствольных энтеростом позднее проводилось закрытие стомы (p = 0,027), а операция занимала меньше времени (p = 0,013). При Т-анастомозе длительнее требовалось парентеральное питание (p = 0,018). Удаление клипсы и появление стула происходили на 5-е и 13-е сутки. Соустье получено в 83,3 %, а закрытие стомы без резекции в 73,3 %. При двуствольной энтеростомии реже возникали печеночная недостаточность (p = 0,018) и дисфункция соустья (p = 0,046). При T-анастомозе выявлено повышение частоты осложнений CDC II (p = 0,013) и III (p = 0,015). Обсуждение. Полученные данные позволяют судить о безопасности способа в сравнении с Т-анастомозом, так как сокращается время операции, длительность парентерального питания, реже требуется инвазивное лечение по поводу осложнений, реже возникает дисфункция соустья. Заключение. Двуствольная энтеростомия с наложением компрессионной клипсы эффективная и безопасная альтернатива Т-анастомозу у детей до 1 года. Сформированное компрессионное соустье позволяет закрыть стому ушиванием ее наружной части. Условиями формирования соустья являются проходимость дистальных отделов и диаметр кишки 1 см

High pressure plasma confinement and stability in gas dynamic trap

The paper reviews recent results obtained in the studies of high beta plasma confinement in Gas-Dynamic Trap (GDT) device. Successful application of Ti -gettering and increase of NB injection power and duration enable to obtain a plasma as high as 30%. Enery balance and stability of this high beta plasma with a density of ~3 10¹³ cm⁻³ were thoroughly studied. Confinement of more dense plasma with steeper density gradients was also studied in the experiment with on-axis gas puff in the central cell