Search results for "guide"

showing 10 items of 1478 documents

Terahertz four-wire waveguides for broadband signal processing and multiplexing

2022

In this work, we introduce a versatile metal-wire waveguide geometry, namely a four-wire waveguide, which is capable of sustaining two independent and orthogonally polarized fundamental modes, thus acting as a broadband polarization-division multiplexer. By integrating multiscale-structured grooves into the wires of such a waveguide, we demonstrate the independent manipulation of polarization-division terahertz signals.

TerahertzSignal ProcessingWaveguidesSettore ING-INF/01 - ElettronicaMultiplexing
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Broadband Terahertz Signal Processing and Multiplexing with Four-wire Waveguides

2022

We demonstrate a new waveguide geometry, namely a four-wire waveguide, which acts as a terahertz polarization-division multiplexer and a novel platform to realize versatile signal-processing functionalities into independent channels over a broadband terahertz frequency range.

TerahertzSignal ProcessingWaveguidesSettore ING-INF/01 - ElettronicaMultiplexing
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Comparison of GTR, T-PRF and open-flap debridement in the treatment of intrabony defects with endo-perio lesions : a randomized controlled trial

2019

Background Titanium- prepared platelet rich fibrin (T-PRF) is an autologous hemo-component with a high concentration of platelets that also incorporates leukocytes, and growth factors into the dense fibrin matrix and can be used as a healing biomaterial. This study assesses the adjunctive use of T-PRF in intrabony defects (IBDs) with open flap debridement (OFD) in comparison with guided tissue regeneration (GTR) as a gold standard and OFD alone as a control. Material and Methods A total of 45 patients (15 per group) were randomized as either T-PRF (test group), GTR (test group), or OFD alone (control group) sites. Probing depth (PD), clinical attachment level (CAL), and IBD were recorded. T…

Test groupmedicine.medical_treatmentAlveolar Bone LossFibrin matrixDentistrylaw.invention03 medical and health sciences0302 clinical medicineRandomized controlled triallawPlatelet-Rich FibrinmedicineHumansPeriodontologyPeriodontitisFlap SurgeryGeneral DentistryTitaniumGuided Tissue Regenerationbusiness.industryResearchSignificant differenceOpen flap debridementIntrabony DefectsAttachment level030206 dentistry:CIENCIAS MÉDICAS [UNESCO]Platelet-rich fibrindigestive system diseasesRoot Canal TherapyTreatment OutcomeDebridementOtorhinolaryngologyDebridement (dental)UNESCO::CIENCIAS MÉDICASGuided Tissue Regeneration PeriodontalSurgerybusiness
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The laparoscopic approach to Acute Mesenteric Ischemia is today unclear and less debated (AMI). There are in fact no clinical evidences on this parti…

2016

The laparoscopic approach to Acute Mesenteric Ischemia is today unclear and less debated (AMI). There are in fact no clinical evidences on this particular focus and only few articles can be found in several databases (pubmed, cochrane library, etc.), and the problem concerns both diagnostic and therapeutic utilization of the procedure. These considerations were already taken into account in 2012 EAES guidelines where the Grade of Recommendation (GoR) of laparoscopy in AMI was low in both diagnostic and therapeutic aspects. According to the new Oxford Classification [1], the use of laparoscopy in patients with suspicious or diagnosed AMI presents a weak GoR.

The laparoscopic approach to Acute Mesenteric Ischemia is today unclear and less debated (AMI). There are in fact no clinical evidences on this particular focus and only few articles can be found in several databases (pubmed cochrane library etc.) and the problem concerns both diagnostic and therapeutic utilization of the procedure. These considerations were already taken into account in 2012 EAES guidelines where the Grade of Recommendation (GoR) of laparoscopy in AMI was low in both diagnostic and therapeutic aspects. According to the new Oxford Classification [1] the use of laparoscopy in patients with suspicious or diagnosed AMI presents a weak GoR.
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Interventistica eco-guidata per l’articolazione d’anca

2013

Lo scopo di questo lavoro è di rivedere le principali applicazioni della interventistica eco-guidata d’anca, descrivendone le indicazioni e la metodologia. L’ecografia è una metodica considerata sicura per i pazienti, in quanto non è stato dimostrato un possibile danno dovuto all’energia trasmessa dagli ultrasuoni ai tessuti del paziente, contrariamente alle metodiche che fanno uso di radiazioni ionizzanti, come la radiografia convenzionale e la tomografia computerizzata. Inoltre, l’ecografia risulta rapida ed efficace nel guidare l’ago verso la sede voluta evitando di intercettare strutture vascolari e/o nervose, consentendo quindi una maggiore sicurezza, rispetto alle tecniche interventis…

The purpose of this work is to review the main applications of ultrasound-guided hip intervention al procedures describing the indications and methodology. Ultrasound is a method considered safe for patients as it has not been shown a possible damage due to ultrasound energy transmitted towards the patient's tissues as opposed to methods that make use of ionizing radiation such as conventional radiography and computed tomography. In addition ultrasound is quick and effective in guiding the needle to the desired location avoiding vascular and/or nerve structures thus enabling greater security compared to the techniques performed in interventional fluoroscopy which also have the disadvantage of a large delivery of ionizing radiation for both patient and operator. Several authors have described the main techniques of ultrasound-guided hip intervention and its various applications that can be both diagnostic (as in the case of joint fluid aspiration to assess the presence or absence of septic arthritis) and therapeutic (as in the case of drugs inoculations or evacuation of exceeding intra-articular fluid).
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Fabrication and Characterization of Polymeric Optical Waveguides Using Standard Silicon Processing Technology

2005

We report the fabrication and characterization of a rib polymeric waveguide having a thick layer of oxidized porous silicon as an innovative solution for the lower cladding. The waveguide was fabricated using standard silicon substrates and Si-based technology. The multimodal guiding structure has a polymethylmetacrylate (PMMA) core and the innovative lower cladding was obtained by thermal oxidation of a porous silicon layer. The waveguide does not have the upper cladding. Propagation loss measurements were performed at 1.48 /spl mu/m using the cut-back method. We obtained propagation loss of about 1.7 dB/cm, confirming the possibility to use the porous silicon oxide as the lower cladding l…

Thermal oxidationMaterials scienceFabricationSiliconbusiness.industryHybrid silicon laserchemistry.chemical_elementPorous siliconCladding (fiber optics)Waveguide (optics)Optical waveguidesOpticschemistryOptoelectronicsbusinessRefractive indexWaveguidesEthers
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Qualità della didattica universitaria e sviluppo della capacità decisionale. Il modello ADVP per garantire i passaggi da L-19 a LM-85bis.

2020

Il presente contributo intende offrire una riflessione sulle competenze attese individuate attraverso la formulazione dei descrittori di Dublino dei CdS in Scienze dell’Educazione (L-19) e Scienze della Formazione Primaria (LM-85bis) istituiti presso l’Ateneo di Palermo e nello stesso tempo proporre un modello per lo sviluppo della maturità professional e necessaria a garantire scelte consapevoli, mature e responsabili. L’analisi condotta ci ha permesso, in una seconda fase di individuare gli obiettivi formativi finali scelti seguendo il modello proposto dalle Linee Guida dell ’Anvur, e di scegliere il modello dell’Activaction du Developpement Vocationnel et Personnel quale strumento per lo…

This paper offers a reflection on the expected competencies identified through the formulation of the Dublin descriptors of the CdS in Education Sciences (L-19) and Primary Education Sciences (LM-85bis) established at the University of Palermo and in the same time to propose a model for the development of professional maturity necessary to ensure informed mature and responsible choices. The analysis carried out allowed us in a second phase to identify the final training objectives chosen following the model proposed by the ANVUR Guidelines and to select the model of the Activaction du Developpement Vocationnel et Personnel for developing decision-making capacity that allows a conscious and responsible passage of students from course L-19 to course LM-85bis safeguarding the specific professional skills that young people wishing to dedicate themselves to teaching in primary and kindergarten must acquire.Settore M-PED/03 - Didattica E Pedagogia Speciale
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Can ECG-gated MDCT be considered an obligatory step to plan and manage a new chest-pain unit?

2007

The recent improvements in multi-detector computed tomography technology and its application in cardiac field allow to consider this non-invasive imaging technique as a promising comprehensive method for detecting significant coronary stenoses in a chest-pain unit. The possibility to use the ECG-synchronisation acquisition protocol, normally limited to the cardiac volume, for the entire thoracic vascular system should have the remarkable potential to reduce invasive and non-invasive procedures actually used to investigate acute chest pain and the number of unnecessary hospital admissions without reducing appropriate admissions in patients with chest pain.

ThoraxAcute coronary syndromemedicine.medical_specialtyChest PainCritical CareCardiac VolumeMyocardial InfarctionChest painElectrocardiographymedicineAcute chest painHumansRadiology Nuclear Medicine and imagingMyocardial infarctionAngina UnstablePractice Patterns Physicians'medicine.diagnostic_testbusiness.industryGeneral MedicineSyndromemedicine.diseaseRadiographic Image EnhancementAngiographyPractice Guidelines as TopicRadiologymedicine.symptombusinessTomography X-Ray ComputedElectrocardiographyEuropean Journal of Radiology
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Comprehensive cardiovascular ECG-gated MDCT as a standard diagnostic tool in patients with acute chest pain

2007

Acute myocardial infarction, pulmonary embolism, and aortic dissection are diseases associated with acute chest pain and may lead to severe morbidity and mortality. These diseases may not be trivial to diagnose in the settings of emergency room. ECG-gated multi-detector computed tomography (MDCT), already established for the assessment of pulmonary embolism and aortic dissection, provides reliable information regarding the triage of patients with acute coronary syndrome in the emergency room. MDCT recently appeared to be logistically feasible and a promising comprehensive method for the evaluation of cardiac and non-cardiac chest pain in emergency department patients. The possibility to sca…

ThoraxChest Painmedicine.medical_specialtyAcute coronary syndromeCritical CareMyocardial InfarctionChest painElectrocardiographyInternal medicinemedicineHumansRadiology Nuclear Medicine and imagingAngina Unstablecardiovascular diseasesMyocardial infarctionPractice Patterns Physicians'Aortic dissectionbusiness.industrySyndromeGeneral MedicineEmergency departmentmedicine.diseaseTriagePulmonary embolismRadiographic Image EnhancementPractice Guidelines as Topiccardiovascular systemCardiologyRadiologymedicine.symptomTomography X-Ray ComputedbusinessEuropean Journal of Radiology
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The 2015 European Thyroid Association Guidelines on diagnosis and treatment of endogenous subclinical hyperthyroidism

2014

Endogenous subclinical hyperthyroidism (SHyper) is caused by Graves' disease, autonomously functioning thyroid nodules and multinodular goitre. Its diagnosis is based on a persistently subnormal serum thyroid-stimulating hormone (TSH) level with free thyroid hormone levels within their respective reference intervals. In 2014 the European Thyroid Association Executive Committee, given the controversies regarding the treatment of Endo SHyper, formed a task force to develop clinical practice guidelines based on the principles of evidence-based medicine. The task force recognized that recent meta-analyses, including those based on large prospective cohort studies, indicate that SHyper is associ…

Thyroid nodulesmedicine.medical_specialtyendocrine systemendocrine system diseasesEndocrinology Diabetes and Metabolismallergic reactionGuidelinesAsymptomaticCognitionInternal medicinemedicineBone riskProspective cohort studySubclinical infectionProgressionbusiness.industryThyroidAtrial fibrillationCardiovascular riskmedicine.diseaseMultinodular goitreAntithyroid drugManagementEndocrinologymedicine.anatomical_structureHeart failureSubclinical hyperthyroidismSurgeryRadioactive iodinemedicine.symptombusiness
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