267,301 research outputs found
Petrology and geochemistry of the late Jurassic-early Cretaceous calc-alkaline magmatism in the Mures ophiolitic nappe (South Apuseni mountains, Romania)
No full textPetrology and geochemistry of the Late Jurassic calc-alkaline series associated to Middle Jurassic ophiolites in the South Apuseni Mountains (Romania)
No full textIn the South Apuseni Mountains, Romania (SAM) Jurassic calc-alkaline magmatic series occur in association with Jurassic ophiolites within a narrow belt that marks the boundary between the Eurasian and Adria Paleozoic continental margins. This association of magmatic series has been previously reported as a single ophiolitic sequence by many authors. Calc-alkaline rocks include volcanic, subvolcanic and intrusive rocks and, along with associated ophiolites, occur in a composite nappe system in the central and NE part of the SAM. Volcanic rocks directly overly ophiolites and include basalts, basaltic andesites, andesites, dacites, and rhyolites, while dykes intrude both calc-alkaline volcanics and ophiolites, and are mainly represented by andesites and dacites, locally showing high-K calc-alkaline affinity. Intrusive rocks mainly include granites and granodiorites.
The geochemical characteristics of the studied rocks correspond to those generated in island arc settings, with a depletion of high field strength elements relative to large ion lithophile elements, and a marked enrichment of light rare earth elements.
Mineral-melt exchange equilibria, as well as bulk-rock major and trace element abundances indicate that fractional crystallization in closed systems played a major role in controlling the magmatic evolution of the SAM calc-alkaline series.
Geothermometric and geobarometric estimations indicate that temperature along the fractionation trend varied from 1216°C for the less evolved rocks down to 860°C for the more evolved rocks, at pressures included between 1.8-2.3 kbar.
SAM calc-alkaline lavas are derived from a MORB-like depleted source modified by slab-derived fluids in an intra-oceanic island arc setting that developed during the closure of the Vardar oceanic basin. These island arc series were formed by both intrusion and extrusion of calc-alkaline rocks into and onto a pre-existing oceanic crust now represented by SAM ophiolites. Unlike some previous interpretations, data presented in this paper demonstrate that no genetic relationship between the calc-alkaline series and the underlying ophiolitic rocks exists.
Data presented in this paper may provide significant constraints for further geodynamic reconstruction of the northernmost border of the Vardar ocean and its related continental margins
PRELIMINARY GEOCHEMICAL DATA ON VOLCANIC ROCKS FROM THE OLT NAPPE (TRANSYLVANIAN NAPPES, ROMANIA): IMPLICATION FOR THEIR ORIGIN IN THE TRANSYLVANIDES
No full textThe Transylvanian nappes (Rarau, Haghimas and Olt nappes - Fig.1a) are interpreted as remnants of the Main Tethyan Suture in the Carpathians. They consist of various types of sedimentary and Mesozoic magmatic rocks related to the ophiolites of Transylvanides, which in turn represent a Tethyan oceanic crust associated to the Vardar Zone. The nature of volcanics from the Olt nappe (ON) is still poorly constrained. Cioflica et al. (1965) reported the occurrence of sub-alkaline and alkaline volcanics interpreted as evolved magmatic products of a tholeiitic ophiolitic series. Nonetheless the alkaline chemistry of volcanics is not consistent with the interpretation of these rocks as ophiolitic remnants linked with the Transylvanides ophiolites, since they no alkaline rocks are found in these ophiolites. The aim of this paper is thus to present preliminary geochemical data on volcanic rocks from the ON in order to assess their possible genetic relationships with the Transylvanides ophiolites
Popoviciu (NicoLAE I.), Epicleza euharistica.
No full textJanin Raymond. Popoviciu (NicoLAE I.), Epicleza euharistica.. In: Échos d'Orient, tome 34, n°177, 1935. p. 112
Direct-Flux Vector Control of induction motor for light traction
No full textThe paper presents a Direct-Flux Vector Control (DFVC) scheme suitable for induction motors employed in light traction applications. In such applications, deep flux weakening is required, and the maximum torque production must be obtained under current and voltage constraints. The mathematical model of the control scheme is discussed and the implementation issues are analysed. Experimental results are presented for a small power induction motor, showing the feasibility of the proposed control, with a particular focus on the robust flux-weakening operation
Does the South Apuseni Mts. ophiolitic nappe extend eastward up to the east Carpathians? New data on volcanics from the Transylvanian Depression and Transylvanian nappes (Romania)
No full textThe South Apuseni Mountains (SAM) are characterized by the widespread occurrence of Middle Jurassic ophiolitic sequences, generated in a mid-ocean ridge setting, and covered by Late Jurassic calc-alkaline volcanics originated in an intra-oceanic island arc. Since 1975, geophysical data have suggested that the SAM ophiolitic nappe extend eastward below the Neogene sedimentary cover of the Transylvanian Depression. In addition, mafic rocks were recovered in deep wells below the Transylvanian Depression; most of these are not studied thoroughly with the exception of some calc-alkaline volcanics. The Transylvanian Nappes are located in the inner part of East Carpathians and are commonly interpreted in literature as having their roots in the ophiolitic nappe below the Transylvanian Depression; in other words, these nappes are commonly interpreted as the easternmost end of the SAM ophiolites. The Transylvanian Nappes include the Olt (Persani), Haghimas, and Rarau Nappes, which consist of various units including a Barremian-lower Aptian wildflysch with blocks of Triassic and Jurassic limestones, arenites, and volcanic rocks of various nature: calc-alkaline, tholeiitic and alkaline. This wildflysh lies at the top of an Early Cretaceous flysch belonging to the sedimentary cover of a crystalline tectonic unit (Bucovinian Nappe), and is covered by Miocene and Quaternary sedimentary and volcanic formations.
In this work volcanic rocks from a deep well in the Transylvanian Depression and from the Olt Nappe are studied in order to constrain their possible relationships with the SAM ophiolitic nappe.
Samples of volcanic rocks from the Transylvanian Depression were collected from the Deleni-6042 deep well made by Romgaz in the Deleni area, between the depth of 4742 and 5017m.
The Olt Nappe represent the southernmost outcrop of the Transylvanian Nappes, and the geochemistry and nature of its volcanics is still poorly known. These volcanics basically crop out in three distinct areas; samples were collected in southern and central areas.
Volcanic rocks from the Deleni well are represented by basalts and basaltic andesites, which display a clear calc-alkaline affinity. Incompatible elements normalised to N-MORB exhibit typical Ta, Nb, and Ti negative anomalies, whereas chondrite-normalised REE patterns display decreasing trends from La to Lu. The relatively low contents of TiO2, Zr, Y, and Ti/V ratios (15-20), as well as the high Th/Yb ratios associated with relatively low Ta/Yb ratios suggest a formation in a supra-subduction setting. These rocks have chemical compositions very similar to those of equivalent island-arc calk-alkaline rocks from the SAM.
Volcanic rocks from the Olt Nappe are represented by basalts, basaltic andesites, and trachytes, which display a clear alkaline affinity with Ba, Th, Ta, Nb, and LREE enrichments. Incompatible elements (including REE) abundances, Ti/V ratios (32-89) and high Th/Yb ratios associated with high Ta/Yb ratios are very similar to those observed in typical ocean-island basalts, and point out for a genesis in a within plate tectonic setting.
As already suggested by, although no ophiolitic rocks were recovered in the Deleni-6042 deep well, the occurrence, at a depth of about 5000m, of calc-alkaline volcanics very similar to those associated with ophiolites in the SAM, indicate that the SAM ophiolitic nappe extend below the Transylvanian Depression for about 70km eastward.
By contrast, alkaline within plate volcanics from the Olt Nappe have no equivalents in the SAM, thus suggesting that the Olt Nappe does not represent the easternmost end of the SAM ophiolitic nappe
Brinzeu (Nicolae), Samanatorul, t. I (Catehetica)
No full textJanin Raymond. Brinzeu (Nicolae), Samanatorul, t. I (Catehetica). In: Échos d'Orient, tome 36, n°185, 1937. p. 110
The course of revolution in the history of the Romanians
No full textTitle: Mersul revoluţiei în istoria Românilor (The course of revolution in the history of the Romanians) Originally published: In the journal România viitoare (Paris, 16 September 1850), vol. I. Language: Romanian The excerpts used are from Nicolae Bălcescu, Opere, vol I/2 (Scrieri istorice, politice şi economice), ed. by G. Zane (Bucharest: Fundaţia pentru literaturăşi artă ‘Regele Carol II,’ 1940), pp. 99–101, 103–108. About the author Nicolae Bălcescu [1819, Bucharest – 1852, Palermo]: his..
Pancreaticoduodenal resection - the experience of the surgery center “Nicolae Anestiadi”
No full textScopul lucrării. Analiza rezultatelor rezecției pancreatoduodenale (RPD) efectuată la pacienții spitalizați în urgență.
Materiale și metode. Studiu retrospectiv-prospectiv, 2016-2021, 27 pacienţi la care s-a practicat operație Whipple, raport B/F=2,5:1,
vârsta 58,6±8,1ani. Cauza spitalizării: icter – 19 (70,4%) și formaţiune intraabdominală – 8 (29,6%). Diagnosticul a fost stabilit prin:
TC – 22 (81,5%)cazuri, RMN – 3 (11,1%) şi CPGRE – 12 (44,2%). S-au analizat două loturi: lot. I – RPD cu stentare preoperatorie și
lot. II – RPD fără decompresie biliară preoperatorie.
Rezultate. Rata RPD la pacienții cu TP cefalice spitalizați în urgență a constituit 16,6%(n=27). Lotul I – 8 (29,6%), vârsta 57,5±6,2 ani,
bilirubinemia la internare 218,8±65,7 mmol/l; stentare endoscopică efectuată în primele 5 zile de spitalizare, timpul de la decompresie
până la intervenţie – 12,0±6,54 zile, durata intervenției 346,5±37,8 min, zile de spitalizare 29,8±12,5 zile, inclusiv ATI – 6,0 zile. Întrun caz din cauza concreșterii TP s-a efectuat hemicolectomie dreaptă. Complicațiile p/op specifice – 4 (50%), mortalitatea p/op – 2
(25%). Lotul II – 19 (70,4%), vârsta 58,0±9,0 ani, bilirubinemia la internare 82,0±13,5 mmol/l, durata intervenției 322,3±55,5 min, zile
de spitalizare 30,6±14,8 zile, inclusiv ATI – 8,0±3,2 zile, complicații p/op – 8 (42,1%), mortalitatea p/op – 2 (10,5%): decedat la 12 și
56 zile p/op din cauza complicațiilor septice intraabdominale.
Concluzii. Rata operațiilor cu viză de radicalitate la pacienții cu TP cefalică, spitalizați în urgență, rămâne joasă din cauza
diagnosticului tardiv, icterul fiind cea mai frecventă cauză de adresare. Stentarea endoscopică preoperatorie este frecvent practicată
pentru rezolvarea sindromul colestatic sever (bilirubinemie cca 200 mmol/l) la pacienții cu TP cefalică. Rata letalității postoperatorii în
loturile studiate a fost similară; durata spitalizării și morbiditatea postoperatorie semnificativ mai elevată la pacienții supuși rezecției
pancreatoduodenale.Aim of study. To analyze the results of pancreaticoduodenal resection(PDR) performed in patients hospitalized in an emergency.
Materials and methods. Retrospective-prospective study, 2016-2021, 27 patients undergoing Whipple surgery, gender ratio=2.5:1,
age 58,6±8,1years. Cause of admission: jaundice 19 (70,4%) and intraabdominal mass 8 (29,6%). Diagnosis was established by CT
22 (81,5%) cases, MRI 3 (11,1%), and ERCP 12 (44,2%). Two groups were analyzed: group I – PDR with preoperative stenting, and
group II – PDR without preoperative biliary decompression.
Results. The rate of PDR in patients with cephalic PT hospitalized in an emergency was 16,6% (n=27). Group I – 8 (29,6%),
age 57,5±6,2 years, bilirubin level on admission 218,8±65,7 mmol/l; endoscopic stenting performed within the first 5 days after
hospitalization, time period from biliary decompression to surgery 12,0±6,54 days, duration of intervention 346,5±37,8 min, hospital
stay 29,8±12,5 days, including ICU – 6 days. In one case right hemicolectomy was performed. Specific postoperative complications – 4
(50%), postoperative mortality – 2 (25%). Group II – 19 (70,4%), age 58±9 years, bilirubinemia on admission 82±13,5 mmol/l, duration
of surgery 322,3±55,5 min, hospital stay 30,6±14,8 days, including ICU – 8±3,2 days, postoperative complications – 8 (42,1%),
postoperative mortality – 2 (10.5%): died at 12th and 56th day due to intra-abdominal septic complications.
Conclusions. The rate of radical surgery in patients with cephalic PTs hospitalized in an emergency remains low due to late diagnosis,
the jaundice being the most common cause of admission. Preoperative endoscopic stenting is frequently performed in patients with
severe cholestatic syndrome (bilirubinemia>200 mmol/l). Postoperative mortality rates in the studied groups were similar; significantly
higher duration of hospital stay and postoperative morbidity were registered in patients undergoing pancreaticoduodenal resection
Esophageal surgery – the experience of the department of surgery of CME faculty of SUMPh “Nicolae Testemitanu”
No full textCatedra chirurgie FECMF, USMF „Nicolae Testemiţanu”, Chişinău, Republica Moldova, Al XII-lea Congres al Asociației Chirurgilor „Nicolae Anestiadi” din Republica Moldova cu participare internațională 23-25 septembrie 2015Introducere: Esofagul, pentru chirurgi, rămâne un segment deosebit al tractului digestiv atât din cauza particularităţilor
anatomo-topografice a organului, a căilor de acces către acesta, cât şi a tehnicilor operatorii asupra respectivului.
Scopul lucrării: De a ne împărtăşi cu experienţa Clinicii de 30 ani în domeniul chirurgiei esofagiene.
Material şi metode: Clinica de Chirurgie FECMF a USMF „Nicolae Testemiţanu” – secţia de chirurgie toracică şi
chirurgie generală a Spitalului Clinic Republican îşi are direcţia cercetărilor, studiilor practico-ştiinţifice ale intervenţiilor
pe esofag din 1974. Fişierul clinicii deţine mai mult de 1000 operaţii pe esofag.
Rezultate: Punct de pornire au servit traumele esofagului adunând 70 cazuri. Alți 83 pacienţi – operaţi pentru diverticul,
192 cu hernii a hiatusului esofagian, 226 suferinzi de diferite forme de stenoze postcaustice, 118 pacienţi s -au operat
pentru boala de reflux gastroesofagian, 115 cu achalazii, cu neoplasm esofagian s-au operat 92 pacienţi, esofag Barrett
au avut 34 bolnavi, neoplasm al joncţiunii esofago-gastrice – 37 pacienţi. Avem 32 cazuri cu ruptură spontană de esofag
(sindromul Boerhaave).
Concluzii: Aceasta este experienţa Clinicii, în baza căreia s-a susţinut o teză de doctor habilitat şi două teze de doctor
în medicină.Introduction: Esophageal surgery represents very special kind of digestive surgery, because of multiple factors –
anatomical-topographic features, specific surgical access and surgical technique.
Aim: To evaluate our clinical experience of 30 years of esophageal surgery.
Material and methods: Since 1974, in the Department of Surgery of CME Faculty of SUMPh „Nicolae Testemitanu”,
thoracic and general surgery departments of Republican Clinical Hospital, were performed about 1000 clinical cases of
esophageal surgery.
Results: Our first experience in esophageal surgery, as a start point was esophageal injuries – 70 patients, followed by
esophageal diverticula – 83 patients, esophageal hiatus hernia – 192 treatment cases, esophageal stricture of various
origin – 226 cases, 118 patients have been treated for gastro-esophageal reflux disease, 115 cases with achalasia of
esophagus, 92 patients have been treated for esophageal cancer, 34 cases – with Barrett’s esophagus,
gastroesophageal junction cancer – 37 cases. In addition, we have experience of 32 cases of spontaneous esophagus
rupture (Boerhaave syndrome).
Conclusions: The experience of the Clinic mentioned above was reflected in a thesis of doctor habilitatus of medical
since and two thesis of doctor of medical since
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