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Advanced Fiber-Optic Acoustic Sensors

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Photonic Sensors 2014年第3期4卷 198-208页

作者： Joao G. V. TEIXEIRA ivo T. LEITE Susana SILVA Orlando FRAZAO EQS Group Rua Joaquim Dias Rocha 354 4470-221 Maia Portugal lNESC TEC (coordinated by INESC Porto) Rua Campo Alegre 687 4169-007 Porto Portugal Department of Physics and Astronomy Faculty of Sciences- University of Porto Rua Campo Alegre 687 4169-007 Porto Portugal

Acoustic sensing is nowadays a very demanding field which plays an important role in modern society, with applications spanning from structural health monitoring to medical imaging. Fiber-optics can bring many advantages to this field, and fiber-optic acoustic sensors show already performance levels capable of competing with the standard sensors based on piezoelectric transducers. This review presents the recent advances in the field of fiber-optic dynamic strain sensing, particularly for acoustic detection. Three dominant technologies are identified - fiber Bragg gratings, interferometric Mach-Zehnder, and Fabry-Perot configurations - and their recent developments are summarized.

关键词： Acoustic sensors fiber optics optical fiber sensors

Endoscopic therapy of weight regain after bariatric surgery

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World Journal of Gastrointestinal Surgery 2021年第12期13卷 1584-1596页

作者： Milutin Bulajic Salvatore Francesco Vadalà di Prampero ivo Boškoski Guido Costamagna Department of Gastroenterology and Digestive Endoscopy Mater Olbia HospitalOlbia 07026Italy Digestive Endoscopy Unit Fondazione Policlinico Universitario Agostino Gemelli IRCCSRome 00168Italy

Weight regain following primary bariatric surgery occurs in a significant proportion of patients and is attributed to epidemiological,anatomical and metabolic *** revision of these patients has significant risks and limited *** revisions that reduce gastric pouch size and diameter of the gastrojejunal anastomosis may offer an effective,safe,less invasive and even reproducible *** herein discuss the indication,selection and feasibility of different endoscopic techniques that could be used in the management of weight regain following primary bariatric *** research could optimize a personalized approach not only in the endoscopic management but also in combination with other therapeutic modalities for weight regain after bariatric surgery.

关键词： Morbid obesity Weight regain Endoscopic sleeve gastroplasty Transoral outlet reduction Bariatric surgery Full thickness suturing

Multidimensional assessment of neuro-psychiatric symptoms in patients with low-grade hepatic encephalopathy: A clinical rating scale

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World Journal of Gastroenterology 2005年第37期11卷 5893-5898页

作者： Sergei Mechtcheriakov ivo W Graziadei André Kugener Julia Wiedemann Chantal Galbavy Hartmann Hinterhuber Josef Marksteiner Wolfgang Vogel Department of General Psychiatry Medical University Innsbruck Austria Department of Gastroenterology and Hepatology Medical University Innsbruck Anichstrasse 35 AT-6020 Innsbruck Austria

AIM： To evaluate the feasibility of a new clinical rating scale for a standardized assessment of cirrhosis-associated neuro-psychiatric symptoms. METHODS： Forty patients with liver cirrhosis （LC, with or without low-grade hepatic encephalopathy） were investigated using a clinical neuro-psychiatric rating scale based on a comprehensive list of neurological, psychomotor, cognitive, affective, behavioral symptoms, and symptoms of disturbed bioregulation. RESULTS： The analysis revealed that the majodty of cirrhotic patients showed, besides characteristic neurological symptoms of hepatic encephalopathy, various psychomotor, affective and bioregulatory symptoms （disturbed sleep and sexual dysfunction）. Patients were impaired in the following subscales： sleep and biorhythm disorder （75.0% of patients）, Parkinsonoid symptoms （25.0%）, affective symptoms （17.5%）, and psychomotor retardation （12.5%）. The increase of total neuro-psychiatric clinical score was significantly associated with the degree of hepatic encephalopathy. CONCLUSION： This study suggests that a substantial number of patients with LC and low-grade hepatic encephalopathy manifest various clinical neuro-psychiatric symptoms. The use of a rating scale, which explores clinical dimensions of hepatic encephalopathy, would improve the management of patients with LC.

关键词： Liver cirrhosis Hepatic encephalopathy Neuropsychiatric symptoms Clinical neuro-psychiatric rating Bradykinesia

Diagnostic value of fine motor deficits in patients with low-grade hepatic encephalopathy

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World Journal of Gastroenterology 2005年第18期11卷 2777-2780页

作者： Sergei Mechtcheriakov ivo W. Graziadei Maria Rettenbacher Ingrid Schuster Hartmann Hinterhuber Wolfgang Vogel Josef Marksteiner Department of General Psychiatry Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria Department of Gastroenterology and Hepatology Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria Department of Biological Psychiatry Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria

AIM: The role of motor dysfunction in early diagnosis of low-grade hepatic encephalopathy remains uncertain. We performed a pilot study to comparatively investigate the kinematic characteristics of small and large rapid alternating movements in patients with liver cirrhosis and low-grade hepatic ***: A kinematic analysis of alternating handwriting (7.5 mm) and large drawing movements (DM, 175 mm) was performed in 30 patients with liver cirrhosis (no hepatic encephalopathy: n = 10; minimal hepatic encephalopathy: n = 9; grade I hepatic encephalopathy: n = 11; healthy controls: n = 12). The correlation between kinematic parameters, clinical neuro-psychiatric symptoms of cerebral dysfunction and the grade of encephalopathy was ***: Both movement types, handwriting and drawing, were significantly slower in cirrhotic patients. In contrast to large DM, the deterioration of handwriting movements significantly correlated with the increase of symptoms of motor dysfunction and differentiated significantly within the group of cirrhosis patients corresponding to the degree of hepatic encephalopathy. CONCLUSION: The deterioration of fine motor control is an important symptom of low-grade hepatic encephalopathy. The kinematic analysis of handwriting allows the quantitative analysis of alterations of motor function and is a possible tool for diagnostics and monitoring of motor dysfunction in patients with low-grade hepatic encephalopathy.

关键词： Hepatic encephalopathy Liver cirrhosis Motor dysfunction Handwriting Kinematic analysis

Value of three-dimensional reconstructions in pancreatic carcinoma using multidetector CT:Initial results

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World Journal of Gastroenterology 2009年第46期15卷 5827-5832页

作者： Miriam Klauβ Max Schbinger ivo Wolf Jens Werner Hans-Peter Meinzer Hans-Ulrich Kauczor Lars Grenacher Department of Diagnostic and Interventional Radiology University of Heidelberg Department of Medical and Biological Informatics German Cancer Research Center(DKFZ) Surgical Clinic University of Heidelberg

AIM:To evaluate the use of three-dimensional imaging of pancreatic carcinoma using multidetector computed tomography(CT)in a prospective ***:Ten patients with suspected pancreatic tumors were examined prospectively using multidetec-tor CT(Somatom Sensation 16,Siemens,Erlangen,Germany).The images were evaluated for the pres-ence of a pancreatic carcinoma and invasion of the peripancreatic vessels and surrounding *** the isotropic CT data sets,a three-dimensional image was created with automatic vascular analysis and semi-automatic segmentation of the organs and pancreatic tumor by a *** CT examinations and the three-dimensional images were presented to the sur-geon directly before and during the patient's operation using the Medical Imaging Interaction Toolkit-based software "ReLiver".Immediately after surgery,the value of the two images was judged by the *** operation and the histological results served as the gold ***:Nine patients had a pancreatic carcinoma(all pT3),and one patient had a serous *** tumor inf iltrated the superior mesenteric *** inf iltration was correctly *** carcinomas were *** comparison to the CT image with axial and coronal reconstructions,the three-dimensional image was judged by the surgeons as better for operation planning and consistently described as ***:A 3D-image of the pancreas repre-sents an invaluable aid to the ***,the 3D-software must be further developed in order to be integrated into daily clinical routine.

关键词： Pancreatic carcinoma 3D-reconstruction Multidetector computed tomography Pancreatic carcinomainvasion Segmentation

Photoluminescent Tb^(3+)-based metal-organic framework as a sensor for detection of methanol in ethanol fuel

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Journal of Rare Earths 2019年第3期37卷 225-231页

作者： Ramon R.F.Fonseca Rafael D.L.Gaspar ivo M.Raimundo Jr. Priscilla P.Luz Department of Chemistry Federal University of Espírito Santo Institute of Chemistry University of Campinas

The sensing capability of a Tb^(3+)-metal-organic framework, based on its photoluminescence, was used for detection of methanol in ethanol fuel. It was synthesized using terbium and trimesic acid as a metal ion center and ligand, respectively. Powder X-ray diffraction, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy were employed to characterize the synthesized MOF-76 structural features. According to the results, MOF-76 was successfully obtained with minor synthetic modification and its activated form(named TbTMA) was tested as a sensor for methanol. Tb^(3+) luminescence intensity increases as the methanol concentration in ethanol fuel also increases and the water content does not affect this response. Our findings indicate TbTMA as an appropriate sensor for evaluating ethanol fuel adulteration by methanol addition above the allowed limit.

关键词： Lanthanide Metal-organic frameworks Luminescence Ethanol fuel Sensor Adulteration

Validation of a novel imaging approach using multi-slice CT and cone-beam CT to follow-up on condylar remodeling after bimaxillary surgery

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International Journal of Oral Science 2017年第3期9卷 139-144页

作者： laura ferreira pinheiro nicolielo jeroen van dessel eman shaheen carolina letelier marina codari constantinus politis ivo lambrichts reinhilde jacobs omfs-impath research group department of imaging and pathologyfaculty of medicineuniversity of leuven and maxillofacial surgery departmentuniversity hospitals leuvenLeuvenBelgium department of oral and maxillofacial radiology university of los andessantiagochileSantiagoChile unit of radiology irccs policlinico san donato MilaneseMilanItaly department of morphology faculty of medicineuniversity of hasseltcampusDiepenbeekBelgium department of dental medicine karolinska institutetHuddingeSweden

The main goal of this study was to introduce a novel three-dimensional procedure to objectively quantify both inner and outer condylar remodelling on preoperative multi-slice computed tomography （MSCT） and postoperative cone-beam computed tomography （CBCT） images. Second, the reliability and accuracy of this condylar volume quantification method was assessed. The mandibles of 20 patients （11 female and 9 male） who underwent bimaxillary surgery were semi-automatically extracted from MSCT/CBCT scans and rendered in 3D. The resulting condyles were spatially matched by using an anatomical landmark-based registration procedure. A standardized sphere was created around each condyle, and the condylar bone volume within this selected region of interest was automatically calculated. To investigate the reproducibility of the method, inter- and intra-observer reliability was calculated for assessments made by two experienced radiologists twice five months apart in a set of ten randomly selected patients. To test the accuracy of the bone segmentation, the inner and outer bone structures of one dry mandible, scanned according to the clinical set-up, were compared with the gold standard, micro-CT. Thirty-eight condyles showed a significant （P〈O.05） mean bone volume decrease of 26.4%_ 11.4% （502.9 mm3＋ 268.1 mm3）. No significant effects of side, sex or age were found. Good to excellent （ICC〉 0.6） intra- and inter-observer reliability was observed for both MSCT and CBCT. Moreover, the bone segmentation accuracy was less than one voxel （0.4 mm） for MSCT （0.3 mm __. 0.2 mm） and CBCT （0.4 mm _ 0.3 mm）, thus indicating the clinical potential of this method for objective follow-up in pathological condylar resorption.

关键词： condylar resorption Cone-beam computed tomography mandibular condyle multi-slice computed tomography three-dimensional imaging

Volume/thrust optimal shape criteria for arches under static vertical loads

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Journal of Traffic and Transportation Engineering(English Edition) 2018年第6期5卷 503-509页

作者： Giuseppe Carlo Marano Francesco Trentadue Rita Greco ivo Vanzi Bruno Briseghella DICAR Department of Civil Engineering and ArchitectureTechnical University of BariBail 70125Italy College of Civil Engineering Fuzhou UniversityFuzhou 350108China DICATECH Department of Civil EngineeringEnvironmentTerritoryBuilding and ChemicalTechnical University of BariBari 70125Italy Department of Engineering and Geology University of Chieti-Pescara "G.d'Annunzio"Pescara65127Italy

Arches are widely used when large spans are necessary, e.g. to overpass large rivers, and further possess unquestioned aesthetics advantages. Their structural efficiency depends primarily on optimal material exploitation, i.e. minimization of internal stress eccentricity,and on minimization of structural material volume. An efficient structure, under these terms, further requires simpler and lighter scaffolding, contributing in minimizing construction *** arches have millenary use and many researches dealing with this typology are available in literature, there is still scope for design optimization. The proposed study is framed within this context. Investigation is limited to statically determinate plane arches under vertical load. The problem of finding the profile of an equal strength catenary subjected to its self-weight is spread out to the case of an inverted catenary of equal strength under its self-weight and an external constant load. In the first optimization step, constant normal stress is imposed at all sections, to maximize material exploitation, and the resulting arch centerline shape is computed in closed form. In the second step, the ensemble of foundations and arch is considered and optimized, taking the linear combination of arch weight and thrust as objective function. The linear combination is dependent on a single variable, and minima of the objective function(i.e. optimal geometric shape parameters) are computed and charted to be simply used in the design process.

关键词： Plane arch Vertical loads Optimal shape Volume/thrust objective functions Analytical solution

Visible fluorescence of biological fluids as a renal failure marker:New integrative approach

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Journal of Innovative Optical Health Sciences 2015年第4期8卷 69-84页

作者： Artur I.Kuznetsov Aleksander Frorip Jekaterina Kozlova Vitali Nagirnyi Mai Ots-Rosenberg ivo Romet Alar Sünter Tartu Science Park AS Ldiamon Riia str.18551014 TartuEstonia Institute of Physics Tartu University Ravila str.14^(c)Tartu 50411Estonia Department of Internal Medicine Tartu University Puusepa str.8Tartu 51014Estonia Biomedicum Tartu University Ravila str.1950411 TartuEstonia

Solid phases of visible fuorescence substance(VFS)of biological fuids(blood,urine,hemodia-lysate)which was proposed earlier as a morbidity and mortality marker by renal failure and diabetes were investigated in-depth by the methods of electron and confocal microscopy,optical spectroscopy and matrix assisted laser desorption-ionization(MALDI)mass *** is shown that dry VFS exists predominantly in the form of carbon-oxygen-nitrogen(N≈8.7 wt.%)nanoparticles(NPs)(5≤d≤100nm).For the first time the existence of the threshold energy E_(g)≈2.15eV for excitation of VFS was observed experimentally and confirmed by semi empirical calculations of the bathochromic shift.A good accordance with the earlier autonomous theo-retical calculations was ***,the long wavelength limit(575 nm)of the spectral range where the VFS can be used as a fluorescent marker was reliably determined.A pilot MALDI comparative study of graphene oxide(GO)and urine VFS was carried *** kinds of nitrogen-free particles(412≤M≤456 Da)were observed in each substance and possible computer models of those have been *** is established that along with nitrogen-containing advanced glycation end products(AGEs)also nitrogen-fee carbon-oxygen-lhydrogen particles(probably toxic)with the composition and structure related to GO can exist in *** types of particles should be taken into account in search for the reasons of high mortality among end stage renal disease patients.

关键词： Auto-fuorescence of biological fuids AGE glycosides end stage renal diseases MALDI of human metabolites fluorescence of graphene oxide