STRUCTURAL STATIC ANALYSIS OF THE CURVED STILT BY FEM USING THE ELCUT PROGRAM

The paper presents a study of the distribution of stresses and strains in the curved stilt of the plough-body, using the ELCUT analysis program by the finite element method. In its public version, the program allows the static structural analysis in three stages of precision. However, there are some limitations on the number of nodes for the discretized structure, depending on its complexity (250 to 500 nodes)

ANALYSIS OF THE STATE OF STRESSES AND STRAINS IN THE CURVED STILT, USING TRIANGULAR FINITE ELEMENTS (CST)

The paper presents a study on the analysis of the distribution of stresses and strains in the curved stilt of the plough-body, using the Finite Element Method. Modeling was performed with the help of triangular finite elements "CST" (Constant Strain Triangle), using a special program for this type of applications “CSTPL.EXE”, developed at University Politehnica of Bucharest, Department of Materials Strength

Endoscopic reinterventions in patients with poor recovery after ERC

Catedra Chirurgie nr. 4, Universitatea de Medicină și Farmacie ”Nicolae Testemițanu”, Chișinău, Republica Moldova, Al XIII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” și al III-lea Congres al Societății de Endoscopie, Chirurgie miniminvazivă și Ultrasonografie ”V.M.Guțu” din Republica MoldovaIntroducere: Anual în clinicile IMSP SCR ”Timofei Moșneaga” din diferite motive, intervențiilor endoscopice ERCP (Endoscopic Retrograde Cholangio-Pancreatography) sunt supuși în jur de 500 pacienți. Ca regulă, pacienții suportă ERCP adecvat, însă un procent din ei sunt totuși supuși unei reintervenții endoscopice din diferite motive. Materiale şi metode: În lucrare sunt analizate evoluțiile post-ERCP la 1432 pacienți realizate pe parcursul ultimilor 3 ani (2016, 2017, 2018) și în special frecvența și motivul reintervențiilor. Astfel s-a constatat că reintervenții au avut loc în 172 (12%) cazuri. Am realizat că motivul principal al reintevențiilor a fost colangita condiționată de fragmente sau calculi restanți – 115 (66,7%), obstrucție de stent – 36 (20.9%), altele – 21 (12.2%). Rezultate: În majoritatea cazurilor reintervențiile endoscopice au servit drept manoperă finală pentru soluționarea cazurilor - 159 (92.4%). Doar în 13 (7.6%) cazuri, reintervențiile endoscopice nu au soluționat situația, urmând ca pacienții să fie supuși intervențiilor chirurgicale tradiționale. Concluzii: Întotdeauna în situațiile nesigure, intervențiile endoscopice urmează a fi finalizate cu una din metodele de drenare endoscopică, și anume - protezare endoscopică sau drenare nazobiliară.Introduction: Anually, in the clinics of IMSP SCR ”Timofei Moșneaga”, because of various reasons, around 500 patients are undergoing endoscopic interventions – ERCP (Endoscopic Retrograde Cholangio-Pancreatography). As a rule, the patients endure the ERCPs adequately, but still, a percentage of them sustain an endoscopic reintervention because of a variety of reasons. Materials and methods: This study analyzes post-ERCP evolution in 1432 patients which underwent an ERCP during the last 3 years (2016, 2017, 2018), and especially the frequency and reasons of reintervention. Thus, it was determined that reinterventions took place in 172 (12%) cases. Also, it was determined that the main reason of reinterventions was cholangitis conditioned by fragments or residual calculus – 115 (66,7%), stent obstruction – 36 (20,9%), other reasons – 21 (12,2%). Results: In most cases, endoscopic reinterventions served as a final maneuver for the settlement of cases - 159 (92,4%). Only in 13 (7,6%) cases, endoscopic reinterventions didn’t solve the situation, the patients later undergoing a traditional surgery. Conclusions: In uncertain situations, endoscopic interventions must always be finalized with one of the endoscopic drainage options, namely endoscopic prosthesis or nasobiliary drainage

Derivaţi ligninici modificaţi prin reacţiile de hifroximetilare şi epoxidare

Lignin derivative (the commercial product -Protobind 2000) offered by the Granit Recherche Developement S.A. company, Lausanne-Schwitzerlandwas synthesized from annual plants. The present study’s aim was tomodify commercial lignins by the reaction of hydroxymethylation (produced in alkaline medium) and epoxydation (reaction with epichlorohydrin was performed in basic catalysis, aiming at increase the functionality) and to characterize the lignin derivatives chemical, spectral (1H NMR) and thermogravimetric analysis (TG). Studies have revealed some functional changes related to the difference in reactivity and reaction conditions

PRODUCTION STATUS OF BIOMASS PELLETS – REVIEW

The use of biomass has become extremely important for the production of clean energy from renewable sources. This is due to the continuously increased need for energy, to the possible depletion of conventional fossil fuels in the near future, and also to the regulations of European Union on the need to reduce significantly the emissions of greenhouse gases. This paper presents a synthesis on the raw materials used for pellets production, some of the important characteristics of pellets (density, ash content and heating power), and also data on the status of pellets production and consumption in different countries. Latest reported data show that the European Union is the biggest wood pellets producer globally, with a production of 13.5 million tonnes in 2014. Romania’s pellets production in 2014 was of 740000 tonnes, and estimations are that in 2020 it will exceed 1.2 million tonnes

The role of superior digestive endoscopy in the diagnosis of failed and/or complicated fundoplication

Catedra Chirurgie nr.1 “Nicolae Anestiadi”, Laboratorul Chirurgie Hepato-Pancreato-Biliară, Catedra chirurgie nr.4 Universitatea de Stat de Medicină și Farmacie „Nicolae Testemițanu”, Laboratorul de endoscopie digestivă avansată (LEDA) CM „Excellence”, Chișinau, .Al XIII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” și al III-lea Congres al Societății de Endoscopie, Chirurgie miniminvazivă și Ultrasonografie ”V.M.Guțu” din Republica MoldovaIntroducere: Fundoplicația în boala de reflux gastro-esofagian (BRGE) este procedeul chirurgical electiv, cu rată de succes pe termen lung de circa 90%. În 10% apar simptome persistente sau recurente de reflux și disfagie, caracteristice fundoplicației eșuate. Simptomele progresive și apariția simptomelor de novo caracterizează fundoplicația complicată. Acestea-s consecințele montajului fundoplicativ strâmt, slăbit, disrupt, poziționat incorect sau migrat supradiafragmal. Scopul studiului a fost de a analiza cazurile cu fundoplicație eșuată/complicată în viziune endoscopică. Materiale și metode: S-au analizat datele endoscopice corelate cu tabloul clinic și radiologic a 25 cazuri de fundoplicație eșuată/ complicată după procedeul Nissen (n=6), Dor (n=6) și Hill-Lortat-Jacob (n=13). Concluzia endoscopică s-a expus în baza examinării complexe a joncțiunii esofago-gastrice (JEG) refăcute în proendoscopie și retroflexie din stomac. Turn endoscopie OLYMPUS EXERA III, endoscop GIF HQ190. Rezultate: S-au constatat urmatoarele semne endoscopice anormale după fundoplicație: (1) esofagită, (2) ostium gastroesoafagian beant, (3) rezistență la pasajul endoscopului, (4) disrupția montajului chirurgical, (5) montaj chirurgical malformat, (6) topografie incorectă a JEG refăcute, (7) gastrostază. Singular sau în combinație, acestea au definit următoarele tipuri de fundoplicație eșuată/complicată: (1) strangulare fundoplicativă (n=2, 8%); (2) malformația fundoplicației (n=7, 28%); (3) disrupție hiatală cu derapaj intratoracic al montajului chirurgical (n=7, 28%); (4) disrupția montajului chirurgical și hernie recurentă (n=4, 16%); (5) disrupție hiatală și hernie paraesofagiană (n=3, 12%); (6) gastrostază (n=2, 8%). Corelație endoscopică și radiologică s-a constatat în 20 (80%) și clinică în 19 (76%) cazuri. Concluzii: Rolul endoscopiei este fundamental pentru diagnosticarea fundoplicației eșuate și complicate.Introduction: Fundoplication, as a surgical intervention in the gastro-esophageal reflux disease (GERD) is actually confirmed as an elective procedure, with a long-term success rate of approximately 90%. In the 10%, persistent symptoms, or reflux recurrence and/or post-surgery disphagia appear which are characteristic to failed fundoplication. Progressive symptoms or the appearance of de novo symptoms and clinical states describe a complicated fundoplication. These defects are due to a fundoplication fit that is too tight, too weak, disrupted, ill-positioned, or that migrated in the thorax. The goal of this study was to analyze the cases with failed/complicated gastric fundoplication with endoscopic vision. Methods and materials: We correlated the endoscopic data with the clinical and radiological data of 25 cases of failed/complicated fundoplication: after Nissen (n=6), Dor (n=6), and Hill-Lortat-Jacob (n=13) methods. The endoscopic conclusion was formed based on the detailed examination of the restored GEJ during proendoscopy and retroflexion. We used the OLYMPUS EXERA III, GIF HQ 190. Results: The following abnormal endoscopic signs, after fundoplication, were detected: (1) esophagitis, (2) open gastro-esophageal junction (GEJ), (3) resistance during the passage of the endoscope, (4) disruption the fundoplication, (5) malformed fundoplication, (6) incorrect topography of the restored GEJ, (7) gastrostasis. The signs have established the following types of failed/complicated fundoplication: (1) tight fundoplication (n=2, 8%); (2) fundoplication malformation (n=7, 28%); (3) hiatal disruption and thoracic slippage of the entire surgical mounting (n=7, 28%); (4) surgical mounting disruption and reccurent hernia (n=4, 16%); (5) hiatal disruption and paraesophageal hernia (n=3, 12%); (6) gastrostasis (n=2, 8%). The diagnostic coincidence with the radiological exam was found in 20 (80%), and clinical correlation in 19 (76%). Conclusion: Role of endoscopy was found to be fundamental in the diagnosis of failed and complicated fundoplication

INFLUENCE OF THE NUMBER OF PASSES OF AGRICULTURAL MACHINERY ON PENETRATION RESISTANCE AND THE DEGREE OF SOIL COMPACTION

In the context of the ongoing development of mechanized agriculture, which implies the use of heavy agricultural machinery, often on soils with high moisture content, it increased significantly the risk of soil compaction. Compaction has become a problem of major proportions especially to farmers, because this phenomenon causes environmental damage, and affects soil quality and crop production. Penetration resistance is a valuable and easy to determine indicator of the degree of compaction of agricultural soil. In this paper are presented the results of some experimental research conducted to determine the penetration resistance of a plot of clover, under the influence of the number of passes of a tractor, in order to assess, from an qualitative point of view, the degree of soil compaction

Cercetări privind comportarea unor soiuri de cireş cu diferite epoci de coacere în condiţiile zonei de N-E a României

The aim of this study is to improve the sweet cherry tree assortment for the Northeastarea of Romania by promoting the new cultivars created at RSFG Iasi, renewing the current sweet cherry tree assortment with new quality cultivars and especially extending the sweet cherry season, filling the existing gaps during the consumption period. At this time, the market is unbalanced in favor of cultivars in the first part of the fruit season. The tendency is towards rebalancing, by reducing the proportion of cultivars with medium season maturity and increasing the early and the late ones. In termsof productivity, the three-year average production (2016-2018) cultivars as followes Golia (19.7 kg / tree), Margonia (23.3 kg / tree) and Bucium (24.7 kg / tree) was remarkable. Regarding the average weight of the fruit, it recorded values between 4.8 g (Cetatuia) and 7.6 g (Bucium)

RESEARCH REGARDING LABORATORY TESTING OF SOIL PROCESSING EQUIPMENT USING THE EFFECT OF ELECTRO-OSMOSIS

Electro-osmosis principle consists of the application of a direct current voltage for an anode-cathode system introduced into soil. The soil water transported from the anode to cathode, on the tool-soil contact surface will produce a lubrification of an active surface and through this a great decreasing of the friction forces and implicit of the energy needed for displacing the tool through the soil. The active surface of the tilling tool is chosen in order to minimize the frictions, respective the mechanic energies needed for tilling. This paper aims to increase the popularization of the electro-osmosis technique, highlighting the advantages of using such a method for soil improvements, as well as in view of optimizing the functional parameters of the soil tillage equipment

Evaluarea unor soiuri de cireş amar obţinute la S.C.D.P. Iaşi

The aim of the paper is to present the valuable features of bitter cherry cultivars obtained at RSFG Iasi, that improve the cultivars’ assortment with different maturation ages of the fruits sequenced all over the cherries’ maturation season. In terms of fruit’s weight (g) and equatorial diameter (mm), the cultivars Amaris (5.1 g and 21.1 mm) and Amar Galata (4.1 g and 18.0 mm) got remarked statistically during the five years. They recorded very significant differences and distinct positive significant differences in comparison with the witness cultivar Silva (3.0 g and 15.8 mm). For the stone’s size, the cultivars recorded a weight between 0.25-0.33 g, recording very negatively significant differences (Amar Maxut with 0.25 g) and negatively distinct significant differences (Amaris with 0.26 g) in comparison with the cultivar Silva as control (0.33 g). Regarding the fruits’ resistance to cracking, Amar Maxut (0.3%), Amaris (0.3%) and Amar Galata (3.3%) present a resistance superior to the control cultivar Silva (4.1%