1,268 research outputs found

    Graded Hecke algebras for disconnected reductive groups

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    We introduce graded Hecke algebras H based on a (possibly disconnected) complex reductive group G and a cuspidal local system L on a unipotent orbit of a Levi subgroup M of G. These generalize the graded Hecke algebras defined and investigated by Lusztig for connected G. We develop the representation theory of the algebras H. obtaining complete and canonical parametrizations of the irreducible, the irreducible tempered and the discrete series representations. All the modules are constructed in terms of perverse sheaves and equivariant homology, relying on work of Lusztig. The parameters come directly from the data (G,M,L) and they are closely related to Langlands parameters. Our main motivation for considering these graded Hecke algebras is that the space of irreducible H-representations is canonically in bijection with a certain set of "logarithms" of enhanced L-parameters. Therefore we expect these algebras to play a role in the local Langlands program. We will make their relation with the local Langlands correspondence, which goes via affine Hecke algebras, precise in a sequel to this paper.Comment: Theorem 3.4 and Proposition 3.22 in version 1 were not entirely correct as stated. This is repaired in a new appendi

    Temperature dependence of electrical properties of electrodeposited Ni-based nanowires

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    The influence of annealing on the microstructure and the electrical properties of cylindrical nickel-based nanowires has been investigated. Nanowires of nickel of nominally 200 nm diameter and of permalloy (Py) of nominally 70 nm were fabricated by electrochemical deposition into nanoporous templates of polycarbonate and anodic alumina, respectively. Characterization was carried out on as-grown nanowires and nanowires heat treated at 650┬░C. Transmission electron microscopy and diffraction imaging of as-grown and annealed nanowires showed temperature-correlated grain growth of an initially nano-crystalline structure with ÔëĄ8 nm (Ni) and ÔëĄ20 nm (Py) grains towards coarser poly-crystallinity with grain sizes up to about 160 nm (Ni) and 70 nm (Py), latter being limited by the nanowire width. The electrical conductivity of individual as-grown and annealed Ni nanowires was measured in situ within a scanning electron microscope environment. At low current densities, the conductivity of annealed nanowires was estimated to have risen by a factor of about two over as-grown nanowires. We attribute this increase, at least in part, to the observed grain growth. The annealed nanowire was subsequently subjected to increasing current densities. Above 120 kA mm -2 the nanowire resistance started to rise. At 450 kA mm -2 the nanowire melted and current flow ceased

    Eficacitatea tratamentului fizioterapeutic cu Amplipuls în litiaza ureterală joasă

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    Summary Contemporary treatment of urolithiasis combines different approaches to the destruction/elimination of the urinary stones. There are a limited number of researches dedicated to the application of physical factors in the treatment of urinary lithiasis i. e. renal colic (Gorovits, 1969, Kubarikov, 1993). The ,,AmplipulsÔÇÖÔÇÖ therapy in pelvic ureteral stones, has a greater efficiency than conventional methods, a fact that was demonstrated in this study. Introducere. ├Än managementul contemporan al urolitiazei sunt ├«mbinate diverse metode de tratament (conservator conven┼úional, ESWL, NLP, litotri┼úie intracorporal─â, chirurgia deschis─â). Un num─âr ne├«nsemnat de cercet─âri este dedicat problemei utiliz─ârii metodelor fizioterapeutice ├«n tratamentul urolitiazei ┼či anume a colicii renale (Gorovits, 1969; Kubarikov, 1993). La momentul actual este reactualizat─â problema de aplicare a metodelor alternative ├«n asociere cu cele conven┼úionale ├«n tratamentul colicii renale (Davenport, 2005). Scopul lucr─ârii. Analiza eficacitatii metodei fizioterapeutice de curent diadinamic ÔÇťAmplipulsÔÇŁ ├«n tratamentul litiazei ureterale joase. Material si metod─â. Studiul a fost realizat retrospectiv pe un lot de 1215 de bolnavi cu calculi ureterali pelvini, trata┼úi ├«n Clinica de Urologie a CN┼×PMU, ├«n perioada anilor 2002-2005. Dimensiunile calculului a variat de la 0,3 la 0,7 cm. Din lotul general de pacien┼úi, ├«n lotul A (746 pacien┼úi) a fost administrat tratament conservator medicamentos (spasmolitice, antalgice, antiinflamatorii nesteroidiene) ┼či fizioterapie cu Amplipuls, iar ├«n lotul B (469 pacien┼úi) numai tratament medicamentos. S-a urm─ârit ├«n ambele loturi durata de eliminare a calculului ├«n corela┼úie cu dimensiunile lui. ├Än studiu nu au fost inclu┼či pacien┼úii care au urmat metode miniminvazive de tratament (ESWL sau metode endoscopice). Rezultate. To┼úi pacien┼úii au eliminat spontan calculul. ├Än lotul A de pacien┼úi s-a determinat eliminarea calculului ureteral de dimesiuni 0,3-0,4 cm ├«n 1,4 zile ┼či de dimensiuni 0,5-0,7 cm ├«n 4,3 zile. ├Än lotul B pacien┼úii au eliminat calculul de 0,3-0,4 cm ├«n 2,5 zile ┼či cel de 0,5-0,7 cm ├«n 5,8 zile, respectiv. Concluzie. Tratamentul fizioterapeutic cu Amplipuls ├«n litiaz─â ureteral─â joas─â duce la eliminarea mai rapid─â a concrementilor: de 1,8 ori pentru calculi cu diametrul mediu 0,3 - 0,4 cm ┼či de 1,3 ori pentru calculi cu diametrul mediu 0,5-0,7 cm

    Optimizing surgical techniques in extra-anatomical ilio-femoral bypasses

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    Scopul lucr─ârii. Bypass-ul extraanatomic ilio-femural crossover este o procedura chirurgicala utilizat─â pentru revascularizarea segmentului aorto-femural, c├ónd interven╚Ťiile endovasculare nu sunt posibile, iar aplicarea unui bypass aorto sau ilio-femural este dificil─â sau chiar imposibil─â din cauza condi╚Ťiilor tehnice sau a st─ârii pacientului. Scopul este studierea rezultatelor precoce ╚Öi tardive pentru favorizarea unor schimb─âri ╚Öi implementarea unor gesturi tehnice ├«n aplicarea bypass-urilor crossover ilio-femural, pentru a crea o geometrie c├ót mai fiziologic─â ce poate oferi o solu╚Ťie durabil─â pe termen lung. Materiale ╚Öi metode. Pe parcursul anilor 2001-2022 au fost efectuate 142 bypass-uri crossover ilio-femurale. Rezultate. ├Än perioada postoperatorie a fost un singur deces ╚Öi s-au efectuat 3 amputa╚Ťii. Au fost analizate duplex scan─ârile ╚Öi CT angiografiile ├«n primele 12 luni postoperatorii, pentru aprecierea altor leziuni aterosclerotice, care ar necesita revascularizare deschis─â s-au endovascular─â at├«t in bazinul recipient c├ót ╚Öi cel donator. Totodat─â, a fost apreciata pozi╚Ťia ╚Öi forma bypass-ului ce a dus la folosirea ulterioar─â a unor noi procedee tehnice ce difer─â de cele descrise anterior. Concluzii. Optimizarea tehnicilor chirurgicale cre├ónd o geometrie c├ót mai fiziologic─â, excluderea maximal─â a angul─ârilor stenozante ale grefei poate oferi bypass-ului extraanatomic crossover ilio-femural o durabilitate ├«ndelungat─â. Acest lucru poate favoriza cre╚Öterea frecven╚Ťei indica╚Ťiilor la folosirea bypass-urilor crossover ilio-femural.Aim of study. The extra-anatomic ilio-femoral crossover bypass is a surgical procedure used for revascularizing the aorto-femoral segment when endovascular interventions are not possible, and when applying an aorto- or ilio-femoral bypass is difficult or even impossible due to technical conditions or the patient's condition. The aim was to study the early and late outcomes to promote changes and implement technical gestures in the application of ilio-femoral crossover bypasses, aiming to create a more physiological geometry that can provide a durable long-term solution. Materials and methods. Between 2001 and 2022, a total of 142 ilio-femoral crossover bypasses were performed. Results. There was one death and three amputations in the postoperative period. Duplex scans and CT angiography were analyzed in the first 12 months postoperatively to assess other atherosclerotic lesions that would require open or endovascular revascularization in both the recipient and donor areas. Additionally, the position and shape of the bypass were evaluated, leading to the subsequent use of new technical procedures that differ from those previously described. Conclusions. Optimizing surgical techniques by creating a more physiological geometry and minimizing stenotic angles of the graft can provide the extra-anatomic ilio-femoral crossover bypass with long-lasting durability. This may increase the frequency of indications for using ilio-femoral crossover bypasses

    Resection of a juxtarenal aneurysm complicated by rupture. Clinical case

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    Caz clinic. Se prezint─â un caz clinic de tratament chirurgical soldat cu succes al unui anevrism de aort─â juxtarenal complicat cu ruptur─â al unui pacient de 76 ani. Boala a debutat de 3 zile cu dureri puternice ├«n regiunea lombar─â, cu iradiere ├«n abdomen. Internat ├«n spitalul or─â╚Öenesc, unde la CT angiografie s-a depistat un anevrism al aortei abdominale complicat cu ruptur─â in spa╚Ťiul retroperitoneal. Pacientul a fost transferat ├«n SCR ,,T. Mo╚ÖneagaÔÇŁ operat ├«n mod urgent. La laparotomie xifopubian─â s-a depistat circa un litru de lichid sero-sangvinolent, anevrism juxtarenal cu hematom retroperitoneal. Dup─â clamparea aortei suprarenale s-a efectuat rezec╚Ťia anevrismului rupt, cu protezare aorto-femural─â pe dreapta ╚Öi iliac─â pe st├ónga. Perioada postoperatorie f─âr─â complica╚Ťii. Externat la a 11-a zi ├«n stare satisf─âc─âtoare. CT angiografie de control peste 6 luni- proteza aortal─â func╚Ťional─â, f─âr─â alte patologii. Concluzie. ├Än cazul anevrismelor aortei abdominale complicate cu ruptur─â, care nu pot fi rezolvate endovascular din diferite motive (anatomie nepotrivit─â, lipsa utilajului necesar la moment etc) este necesar tratamentul chirurgical deschis ├«n mod urgent. Posedarea metodelor deschise nu trebuie exclus─â din arsenalul chirurgului vascular.Clinical case. We present a clinical case of a successful surgical treatment of a ruptured juxtarenal aortic aneurysm in a 76-year-old patient. The disease started three days ago with severe pain in the lower back, radiating to the abdomen. The patient was transferred to the local hospital, where a CT angiography revealed an abdominal aortic aneurysm complicated by retroperitoneal rupture. The patient was urgently transferred to the "T. Mo╚Öneaga'' Intensive Care Unit for surgery. Xipho-pubic laparotomy revealed approximately one liter of serosanguinous fluid, a juxtarenal aneurysm with a retroperitoneal hematoma. After clamping the suprarenal aorta, resection of the ruptured aneurysm was performed, followed by aortic-femoral grafting on the right side and iliac grafting on the left side. The postoperative period was uneventful. The patient was discharged in satisfactory condition on the 11th day. A follow-up CT angiography after 6 months showed a functional aortic graft without any other pathologies. Conclusions. In cases of abdominal aortic aneurysms complicated by rupture, which cannot be resolved endovascularly due to various reasons (inappropriate anatomy, lack of necessary equipment at the moment, etc.), urgent open surgical treatment is necessary. Proficiency in open surgical techniques should not be excluded from the vascular surgeon's armamentarium

    Dirac cohomology, elliptic representations and endoscopy

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    The first part (Sections 1-6) of this paper is a survey of some of the recent developments in the theory of Dirac cohomology, especially the relationship of Dirac cohomology with (g,K)-cohomology and nilpotent Lie algebra cohomology; the second part (Sections 7-12) is devoted to understanding the unitary elliptic representations and endoscopic transfer by using the techniques in Dirac cohomology. A few problems and conjectures are proposed for further investigations.Comment: This paper will appear in `Representations of Reductive Groups, in Honor of 60th Birthday of David Vogan', edited by M. Nervins and P. Trapa, published by Springe

    On the elliptic nonabelian Fourier transform for unipotent representations of p-adic groups

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    In this paper, we consider the relation between two nonabelian Fourier transforms. The first one is defined in terms of the Langlands-Kazhdan-Lusztig parameters for unipotent elliptic representations of a split p-adic group and the second is defined in terms of the pseudocoefficients of these representations and Lusztig's nonabelian Fourier transform for characters of finite groups of Lie type. We exemplify this relation in the case of the p-adic group of type G_2.Comment: 17 pages; v2: several minor corrections, references added; v3: corrections in the table with unipotent discrete series of G

    Pathological elongation of the internal carotid artery: surgical treatment and immediate postoperative results

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    Scopul lucr─ârii. ├Än structura cauzelor dezvolt─ârii insuficien╚Ťei cerebrovasculare, elongarea patologic─â a arterei carotide interne ocup─â locul 2, dup─â afectarea aterosclerotic─â. Prevalen╚Ťa dolicoarteriopatiei la popula╚Ťia general─â se estimeaz─â a fi de la 10 la 40 %, iar de la 16% p├ón─â la 56 % din pacien╚Ťi au ├«n anamnestic deficit neurologic tranzitor sau permanent. Scopul lucr─ârii este optimizarea tehnicilor chirurgicale ╚Öi aprecierea eficien╚Ťei postoperatorii imediate la pacien╚Ťii cu elongare patologic─â a arterei carotide interne. Materiale ╚Öi metode. Studiul efectuat reprezint─â o analiz─â retrospectiv─â a 243 pacien╚Ťi, trata╚Ťi ├«n cadrul IMSP SCR ,,Timofei Mo╚ÖneagaÔÇŁ, sec╚Ťia de Chirurgie Vascular─â ├«n perioada 2002-2022. Rezultate. La pacien╚Ťii supu╚Öi studiului s-a efectuat 258 interven╚Ťii chirurgicale. Rezultatele imediate au fost: la 230 pacien╚Ťi (89.14 %) a disp─ârut simptomatologia preoperatorie, AVC ischemic s-a ├«nregistrat la 1 pacient, sindrom coronarian acut sau deces nu s-a ├«nregistrat la nici un pacient din lotul studiat. Concluzii. Lu├ónd ├«n considerare rata mic─â de complica╚Ťii periprocedurale precum ╚Öi eficacitatea postoperatorie imediat─â evident─â, putem spune c─â interven╚Ťia chirurgical─â ├«n tratamentul elong─ârilor patologice ale arterelor carotide interne reprezint─â o metoda sigur─â ╚Öi eficient─â pentru prevenirea accidentelor vasculare cerebrale acute ╚Öi ├«mbun─ât─â╚Ťirea calit─â╚Ťii vie╚Ťii pacien╚Ťilor.Aim of study. Among the causes contributing to the development of cerebrovascular insufficiency, pathological elongation of the internal carotid artery ranks second after atherosclerotic involvement. The prevalence of dolichoarteriopathy in the general population is estimated to range from 10% to 40%, and between 16% and 56% of patients have a history of transient or permanent neurological deficits. The aim of this study was to optimize surgical techniques and assess immediate postoperative efficacy in patients with pathological elongation of the internal carotid artery. Materials and methods. This study represents a retrospective analysis of 243 patients treated at the State Medical and Pharmaceutical University "Timofei Mo╚Öneaga", Department of Vascular Surgery, between 2002 and 2022. Results. A total of 258 surgical interventions were performed in the study group. The immediate results were as follows: symptomatology disappeared in 230 patients (89.14%), one patient experienced an ischemic stroke, and no cases of acute coronary syndrome or death were recorded among the studied patients. Conclusions. Considering the low rate of periprocedural complications and the evident immediate postoperative effectiveness, it can be concluded that surgical intervention for the treatment of pathological elongation of the internal carotid artery is a safe and efficient method for preventing acute cerebrovascular accidents and improving the quality of life for patients

    Surgical treatment tactics in renal cell carcinoma with metastatic thrombus in the inferior cava vein

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    Sec╚Ťia Chirurgie Vascular─â, Laboratorul de Cardiologie Interven╚Ťional─â ╚Öi Endochirurgie, IMSP Spitalul Clinic RepublicanÔÇŁTimofei Mo╚ÖneagaÔÇŁ, Chi╚Öin─âu, Republica Moldova, Al XIII-lea Congres al Asocia╚Ťiei Chirurgilor ÔÇ×Nicolae AnestiadiÔÇŁ ╚Öi al III-lea Congres al Societ─â╚Ťii de Endoscopie, Chirurgie miniminvaziv─â ╚Öi Ultrasonografie ÔÇŁV.M.Gu╚ŤuÔÇŁ din Republica MoldovaIntroducere: Pacien╚Ťii cu cancer renal reprezint─â 15.3 cazuri noi per 100,000 popula╚Ťie anual raportate ├«n Statele Unite ale Americii. Material ╚Öi metode: Pe parcursul anilor 2010-2019, ├«n sec╚Ťia de chirurgie vascular─â a IMSP SCR ÔÇťTimofei MosneagaÔÇŁ, au fost opera╚Ťi 34 pacienti cu diagnosticul de cancer renal cu concre╚Ötere ╚Öi tromb metastatic ├«n vena cav─â inferioar─â. ├Än dependen╚Ť─â de tipul trombului metastatic in vena cava inferioara au fost abordate diferite metode de acces, mobilizare ╚Öi trombectomie cu sau far─â plastie a defectului parietal. Rezultate: Histologic a fost descoperit cancerul renal cu celule clare la to╚Ťi pacien╚Ťii, ce reprezint─â 80-90% din cancerele renale. Durata medie de spitalizare a pacien╚Ťilor a fost de 9 zile. Concluzii: Nefrectomia si trombectomia din vena cava inferioara ├«n cazul hipernefroamelor cu tromb metastatic ├«n vena cava inferioar─â pot fi efectuate ├«n siguran╚Ť─â cu o rata ├«nalt─â de supravie╚Ťuire la distan╚Ť─â a pacien╚Ťilor. Tipul de acces ╚Öi mobilizare a venei cave depinde de nivelul extinderii trombului metastatic. Suportul de circula╚Ťie extracorporeal─â este necesar doar ├«n cazurile de extindere intracardiac─â a trombului metastatic.Introduction: Patients suffering from renal cancer, represent 15.3 new cases per 100,000 populations, annualy reported in the United States of America. Materials and methods: During 2010-2019, 34 patients with renal cancer involving ingrow and the inferior cava vein metatstatic thrombus underwent surgery in Vascular Surgery Department PBI CRH ÔÇťTimofei MosneagaÔÇŁ. Depending on the inferior cava vein metastatic thrombus type, were used different access, mobilization and thrombectomy types, with or without parietal defect plastics. Results: Clear cell renal cancer was confirmed histologically in all patients, that represents 80-90 % of the total amount of renal cancers. Average hospital stay represented 9 days after surgery. Conclusions: Nephrectomy and inferior cava vein thrombectomy, in renal cancer with inferior cava vein metastatic thrombus, can be performed safely, with a high rate of survival, also at distance in time. The type of access and mobilization of the cava vein depends on the level of metastatic thrombus enlargement. Extracorporeal circulation is necessary only in cases that include intracardiac thrombus extension
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