STUDY OF STRESSED-DEFORMED STATE OF THE POLYGONAL ARCH COVERINGS OF WOOD

In this work the use of wooden I-beams with OSB wall as the load bearing elements for polygonal arch coverings of buildings of various spans are considered. Special steel connecting pieces can shape the polygonal arch coverings. Calculations of the constructions with a span of 12 and 18 meters and an analysis of their stress-strain state are given.In this work the use of wooden I-beams with OSB wall as the load bearing elements for polygonal arch coverings of buildings of various spans are considered. Special steel connecting pieces can shape the polygonal arch coverings. Calculations of the constructions with a span of 12 and 18 meters and an analysis of their stress-strain state are given

Late results of embolization of a portal hepatic vein branches in patients, suffering extended hepatic tumors

Objective. To analyze late results of preoperative  embolization of the portal hepatic vein branches (EPHVB) in patients, suffering extended hepatic tumors and extremely border-like small calculated residual hepatic volume(CRHV). Маterials and methods. From 2004 to 2014 yr the extended hepatic resection (HER) was performed in 285 patients, to whom EPHVB was applied (the main group), аnd in 353 patients as well, but without endovascular preparation (control group). In both groups dynamics of laboratory indices, structure of complications and lethality, late survival were studied. Results. In the main group a trustworthily lower rate of an acute hepatic insufficiency and connected with a lower postoperative lethality - accordingly 2.3 and 4.6%, comparing with a control group - 9.3 and 8.8%, were suggested. The laboratory data dynamics have witnessed a lesser intensiveness of postoperative hepatocytolysis and lesser degree of the hepatic synthetic function lowering in the main group, what have confirmed a better functional adaptation of hepatic residual in patients, to whom preoperative EPHVB was applied. Conclusion. Preoperative EPHVB permits to lower the postoperative complications and lethality rate in patients, suffering hepatic tumors, due to better functional adaptation of hepatic residual

15-years experience of living donor liver transplantation in Ukraine

Institutul Național de Chirurgie și Transplantologie “А.Shalimov”, Kiev, Ucraina, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Transplantul hepatic (TH) reprezintă unica opțiune de tratament radical în cazul patologiilor hepatice terminale. Din 2001 Institutul de Chirurgie și Transplantologie din Ucraina a realizat programul de TH de la donator viu. Scopul lucrării: Evaluarea rezultatelor TH pe perioada anilor 2001-2015. Material și metode: Au fost studiate rezultatele a 142 TH alogene de la donator viu, efectuate pe perioada anilor 2001-2015. Toți recipienții s-au aflat pe lista de așteptare în baza criteriilor UNOS. Indicațiile au fost: ciroza secundară diferitelor maladii (hepatita virală – 23,2%, hepatita autoimună – 9,15%, alte etiologii – 11,3%), ciroza criptogenă – 13,4%, atrezia biliară – 31,7% și tumorile hepatice – 11,3%. Investigarea donatorului a fost efectuată în conformitate cu protocolul prestabilit. Volumul grefei de transplant a fost calculat în baza datelor CT și RMN. Rezultate: Din 142 TH de la un donator viu în 73 cazuri s-a transplantat lobul hepatic drept, 14 – lobul stîng și 54 – secțiunea laterală stângă. Într-un caz, a fost realizat transplantul unimomentan de la 2 donatori vii. Vârsta medie a recipienților a fost – 22,3±8,2 ani (7 luni – 58 ani), 75 dintre aceștia au fost de sex masculin. Toți recipienții au prezentat ciroză decompensată clasa C după Child-Pugh. Valoarea medie a stării funcționale integrale hepatice a fost de 12,5±1,2 puncte. Ascita refractară preoperator a fost observată la 47 pacienți, 8 pacienți au prezentat episoade recurente de peritonită bacteriană spontană, 6 pacienți – sindrom hepatorenal de tip II. Pierderea de sînge intraoperator a fost 2400±900 ml, durata operației – 16±3 ore. Durata ischemiei la rece: 45±17 min, la cald – 48±12 min. Durata medie a spitalizării recipienților a constituit – 32±8 zile. Mortalitatea postoperatorie precoce a fost în 23 cazuri – 16,1%. Rata de supraviețuire la 1 an – 73,9% și la 5 ani – 66,9%. Concluzii: TH alogen de la donator viu reduce semnificativ timpul de aflare a recipientului în lista de așteptare și îmbunătățește supraviețuirea. Rezultatele TH sunt comparabile cu rezultatele studiilor străine, ceea ce face posibilă recomandarea efectuării pe larg a TH, ca metodă de tratament radical a pacienților cu patologii hepatice terminale.Introduction: Liver transplantation is the only radical treatment method of terminal liver diseases. From 2001, Institute of Surgery and Transplantology of Ukraine has been performing allogenic transplantation program from the living donor. Aim: the current study is oriented on the survey of transplantation results for 2001-2015. Material and methods: The study surveyed 142 patients’ transplantations from living donors, performed from 2001 to 2015. All recipients were on the waiting list for transplantation from a relative, according to UNOS Criteria. The indications for inclusion in the waiting-list were: liver cirrhosis as a consequence of different diseases (viral hepatitis – 23.2%; autoimmune hepatitis – 9.15%, other etiology – 11.3%), cryptogenic cirrhosis – 13.4%, biliary atresia – 31.7% and liver cirrhosis – 11.3%. Donor investigations have been done according to the created protocol. Transplant’s volume was calculated with CT and MRI. Results: From 142 patients who supported living donor transplantation, in 73 cases has been performed right hemi-liver transplantation, in 14 – of the left hemi-liver, and in 54 – of the left lateral section. In one case has been performed simultaneous transplantation from 2 living donors. The average recipient’s age was 22.3±8.2 years (7 months – 58 years), 75 recipients were males. All patients with cirrhosis were of C-class according to Child-Pugh. The average index of integral liver functionality has been 12.5±1.2 points. Resistant ascitis in preoperative period was detected in 47 patients, in 8 – recurrent episodes of spontaneous bacterial peritonitis, in 6 – II type hepatorenal syndrome. Intraoperative bleeding was 2400±900mL, time of operation – 16±3 hours. The lasting of cold-ischemia was 45±17 min, warm ischemia – 48±12 min. The average duration of postoperative period for recipients was 32±8 days. Early postoperative lethality was noted in 23 cases – 16.1%. Yearly survival – 73.9%, and the actual 5-year survival rate was 66,9%. Conclusions: Living donor transplantation significantly reduces the patient time from waiting-list and increases patient survival rate. The obtained transplantation results are comparable with the results of international studies, and allow us to recommend transplantation for a large group of indications, as a method of selecting treatment for terminal liver pathology patients

КИНЕТИКА И МЕХАНИЗМ ОКИСЛИТЕЛЬНОЙ ПОЛИМЕРИЗАЦИИ 2-МЕТИЛАНИЛИНА

The kinetics of oxidative polymerization of 2-methylaniline in hydrochloric acid aqueous solution in the presence of ammonium peroxydisulfate as the oxidant was studied. The presence of autocatalysis was demonstrated, and the reaction mechanism was suggested. On the basis of the mechanism a kinetic model of oxidative polymerization of 2-methylaniline was built. The model is in satisfactory agreement with the experimental results.И сследована кинетика окислительной полимеризации 2-метиланилина в солянокислом водном растворе в присутствии пероксидисульфата аммония в качестве окислителя. Показано наличие автокатализа, предложен механизм реакции. На основании механизма построена кинетическая модель окислительной полимеризации 2-метиланилина, находящаяся в удовлетворительном соот-ветствии с результатами эксперимента

Кинетика и механизм окисления 2,4,6-триметиланилина

The kinetics of oxidation of 2,4,6-trimethylaniline hydrochloride with ammonia peroxydisulfate in an aqueous solution was studied by the potentiometric method. It was shown that the reaction proceeds as the second order process. The rate constants of one-electron transfer from 2,4,6-trimethylaniline molecule to peroxydisulfate ion were determined and are 1.46, 2.3, and 3.17 l/(mol.sec) at 30, 35 and 40° С , respectively. The activation energy of one-electron transfer from 2,4,6-trimethylaniline molecule to peroxydisulfate ion is 61 kJ/mol, the entropy of activation is –63 J/(mol К ), and the enthalpy of activation is 58.5kJ/mol. It was determined that 2,4,6-trimethylaniline is not prone to oxidative polymerization. This indicates that cation-radicals of aromatic amines which act as active centers of aniline oxidative polymerization are formed. The fact that there is no autoacceleration during oxidation of 2,4,6-trimethylaniline hydrochloride indicates that the oxidative polymerization of aniline is an autocatalytical process.Потенциометрическим методом исследована кинетика окисления 2,4,6-триметиланилина под действием пероксидисульфата аммония в водном растворе. Показано, что скорость реакции подчиняется уравнению второго порядка. Определены константы скорости и энергия активации окисления 2,4,6-триметиланилина, а также предложен механизм реакции

Study Of Stressed-deformed State Of The Polygonal Arch Coverings Of Wood

In this work the use of wooden I-beams with OSB wall as the load bearing elements for polygonal arch coverings of buildings of various spans are considered. Special steel connecting pieces can shape the polygonal arch coverings. Calculations of the constructions with a span of 12 and 18 meters and an analysis of their stress-strain state are given