Articles de revues : « Infiltrato »

1

Laužikas, Giedrius, Gintaras Varanauskas et Juozas Stanaitis. « Apendikulinio infiltrato diagnostikos ir gydymo ypatumai ». Lietuvos chirurgija 2, n^o 1 (1 janvier 2004) : 0. http://dx.doi.org/10.15388/lietchirur.2004.1.2377.

Texte intégral

Résumé :

Giedrius Laužikas, Gintaras Varanauskas, Juozas StanaitisVilniaus universiteto Bendrosios ir kraujagyslių chirurgijos klinikos Bendrosios chirurgijos centras,Vilniaus greitosios pagalbos universitetinė ligoninė,Šiltnamių g. 29, LT-2043 VilniusEl paštas: giedrius.lauzikas@vgpul.lt Įvadas / tikslas Apendikulinis infiltratas – viena iš ūminio apendicito formų, pasižyminti sudėtinga diagnostika ir gydymo ypatumais. Literatūroje diskutuojama, kuriam gydymo metodui – operaciniam ar konservatyviam – teikti pirmenybę. Mūsų darbo tikslas – apžvelgti apendikulinių infiltratų diagnostikos ir gydymo ypatumus pagal literatūros ir VGPUL duomenis. Ligoniai ir metodai Retrospektyviai išnagrinėtos 49 ligonių, 1992–2002 m. gydytų Vilniaus greitosios pagalbos universitetinėje ligoninėje nuo apendikulinio infiltrato, ligos istorijos. Vėlyvieji gydymo rezultatai vertinti apklausiant telefonu ar peržiūrint kartotinės hospitalizacijos ligos istorijas. Rezultatai Per 1992–2002 m. VGPUL Bendrosios chirurgijos klinikoje nuo apendikulinio infiltrato gydyti 49 ligoniai: 27 moterys ir 22 vyrai. Į stacionarą šia liga sergantys ligoniai kreipėsi vidutiniškai po 8,4 paros nuo ligos pradžios. Iki tol 43 ligoniai gydėsi patys, 4 – gydyti poliklinikoje nuo kitų ligų, 2 – išleisti iš ligoninės priimamojo. Stacionare vidutiniškai praleido po 17,4 dienos, dauguma jų pasveiko, mirė 2 ligoniai (4,08%). Diagnozuojant apendikulinį infiltratą remtasi šiais medicininės apžiūros duomenimis: čiuopiamu infiltratu dešinėje klubinėje srityje (29 ligoniai; 59,2%), pilvo echoskopijos (35 ligoniai; 71,4%) ar KT metu (vienas ligonis) matomu dariniu dešinėje klubinėje srityje. Keturiasdešimt apendikuliniu infiltratu sirgusių ligonių buvo operuoti: 27 ligoniams – atlikta laparotomija dešinėje klubinėje srityje ir drenavimas, 6 – vidurinė laparotomija ir drenavimas, 6 – ileocekalinio kampo rezekcija, 1 – dešinioji hemikolektomija. Devyni ligoniai buvo gydyti konservatyviai. Vėlyvuoju laikotarpiu iš 24 ligonių 18 buvo operuoti: šešiolikai atlikta apendektomija, dviem – dešinioji hemikolektomija. Šešiems iš 49 (12,24%) šia liga sirgusių ligonių diagnozuota onkologinė liga. Išvados Gydant apendikulinį infiltratą reikėtų skirti konservatyvų gydymą ir pagal galimybes išsiaiškinti ligos priežastį. Jei šis gydymas neveiksmingas, rekomenduojama ligonį operuoti. Operacijos metu radus apendikulinį infiltratą, tikslinga atlikti radikalią rezekcinę operaciją pagal onkologinius principus. Prasminiai žodžiai: apendikulinis infiltratas, laparotomija, drenavimas, ileocekalinio kampo rezekcija, hemikolektomija Diagnostics and treatment of appendiceal mass: 10 years of experience at Vilnius University Emergency Hospital Giedrius Laužikas, Gintaras Varanauskas, Juozas Stanaitis Background / Objective Discussions still continue concerning treatment tactics for appendiceal mass. The main endpoint of the study was to analyse appendiceal mass diagnostic measurements and treatment at Vilnius Emergency University Hospital. Patients and methods Medical records for patients admitted with "appendiceal mass" between 1992–2002 were reviewed. There were 49 patients treated for appendiceal mass at Vilnius Emergency University Hospital General Surgery Clinic during 1992–2002: 27 women, 22 men. Results The mean duration of hospitalisation was 17.4 days, two patients (4.08%) died. "Appendiceal mass" was diagnosed by clinical investigation in 29 patients (59.2%), by sonoscopy in 35 patients (71.43%), and by CT-scan in one patient. Fourty patients were operated on. Laparotomy in right iliac fossa and drainage were performed in 27, median laparotomy and drainage in six, ileocecal resection in 6 cases, right hemicolectomy in one case. Nine patients received conservative treatment. Malignancy was diagnosed in 6 patients (12.24%). Most "appendiceal masses" should be treated conservatively and examined carefully. Conclusions If there is no effect of conservative treatment, an operation should be performed. If appendiceal mass is found during operation, a radical resection according to oncological principles is the operation of choice. Keywords: appendiceal mass, laparotomy, drainage, ileocecal resection, hemicolectomy

Styles APA, Harvard, Vancouver, ISO, etc.

2

Briscoe, D. M., J. S. Pober, W. E. Harmon et R. S. Cotran. « Expression of vascular cell adhesion molecule-1 in human renal allografts. » Journal of the American Society of Nephrology 3, n^o 5 (novembre 1992) : 1180–85. http://dx.doi.org/10.1681/asn.v351180.

Texte intégral

Résumé :

The expression of vascular cell adhesion molecule-1 (VCAM-1) in 11 human renal allograft biopsies and 3 normal kidney specimens was investigated by immunocytochemistry. VCAM-1 expression was correlated with the degree of CD3+ T cell infiltration and the clinicopathologic diagnosis of acute rejection. CD3+ infiltrates were seen in all biopsies with rejection, but not in normal biopsies or one with acute tubular necrosis, and were accompanied by CD68+ monocyte/macrophage infiltrates. In normal biopsies, VCAM-1 was present on occasional tubules, where its expression was patchy and restricted to the basolateral surface of cells with slight cytoplasmic staining. The total number of tubules expressing VCAM-1 significantly increased in specimens infiltrated with CD3+ T cells. Moreover, in these infiltrated biopsy specimens, VCAM-1 was present throughout the cytoplasm of tubular cells concentrated on the basolateral surface. VCAM-1 was also observed on vascular endothelial cells where its expression correlated with the degree of CD3+ infiltrate. Mean scores (0 to 3+) for endothelial VCAM-1 expression increased from 0 (CD3+ score, 0) to a mean score of 2.25 in association with CD3+ T cell infiltrates (CD3+ score, 3). Endothelial VCAM-1 was predominantly on vessels in areas of infiltrate, including peritubular capillaries, venules, and arterioles, but was notably absent on glomerular endothelium. VCAM-1 also stained mesangial cells in an occasional CD3+ infiltrated specimen. It was concluded that the expression of VCAM-1 is increased on renal tubules and renovascular endothelium in rejecting renal allografts in association with CD3+ infiltrates.(ABSTRACT TRUNCATED AT 250 WORDS)

Styles APA, Harvard, Vancouver, ISO, etc.

3

Yu, Peng, Ma Qian et Graham B. Schaffer. « Rapid Prototyping of Aluminium Alloy Parts : The Effect of Infiltration Atmosphere ». Materials Science Forum 618-619 (avril 2009) : 635–40. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.635.

Texte intégral

Résumé :

An investigation has been made on the infiltration behaviour in rapid prototyping of Al alloy parts under different infiltration atmospheres. An Al 6061 alloy preform was first prepared by selective laser sintering. Then the aluminium precursor powders in the preform were converted into AlN to form a skeletal AlN structure, which was subsequently pressureless infiltrated with a molten Al 6061 alloy under nitrogen, argon or vacuum. The pathway of the infiltrant was determined by density measurements in conjunction with metallographic examination and quantitative image analysis. Detailed comparison of the microstructures at the surface and the centre of the as-infiltrated samples indicates that the pathway into the porous preform is dependent on the infiltration atmosphere. Under vacuum, the infiltrant fills the interior of the preform first and then propagates to the surface. In contrast, under nitrogen or argon, the infiltrant penetrates along the surface prior to filling the interior.

Styles APA, Harvard, Vancouver, ISO, etc.

4

Chimanski, Afonso, Amanda Martins Jordão, Paulo Francisco Cesar et Humberto Naoyuki Yoshimura. « Devitrification in SiO₂-B₂O₃-Al₂O₃-La₂O₃-TiO₂ Glass during the Infiltration of Ceramic Composite ». Materials Science Forum 881 (novembre 2016) : 77–82. http://dx.doi.org/10.4028/www.scientific.net/msf.881.77.

Texte intégral

Résumé :

Dental prostheses made of ceramic composites infiltrated with glasses have been used due to their biocompatibility and possibility to mimic the natural teeth. In this study, the devitrification behavior of 20SiO2-25B2O3-25Al2O3-15La2O3-15TiO2 glass during the infiltration process in a porous alumina preform was investigated. Glass frits were prepared by melting the raw materials at 1500 °C for 60 min. The glass was infiltrated into the alumina preform at 1,150 or 1,200 °C for 60 min. The specimens were characterized by X-ray diffraction analysis and scanning electron microscopy. After the infiltration, it was possible to note that the devitrification process occurred in the remaining glass (excess glass that did not infiltrate in the preform), forming mostly aluminum borate and mullite crystalline phases. However, within the infiltrated composite no devitrification was noticed in the infiltrated glass. Possible explanations for this behavior are discussed.

Styles APA, Harvard, Vancouver, ISO, etc.

5

Thammarakcharoen, Faungchat, et Jintamai Suwanprateeb. « Preparation of 3DP Hydroxyapatite Composite by Single and Double Pass Poly(ε-caprolactone) Infiltration ». Key Engineering Materials 545 (mars 2013) : 69–73. http://dx.doi.org/10.4028/www.scientific.net/kem.545.69.

Texte intégral

Résumé :

Recently, porous hydroxyapatite was fabricated by three dimensional printing (3DP) in coupled with low temperature phosphorization to yield nanosized and low crystalline structure. However, brittleness was an intrinsic drawback for some foreseen applications. Polymer infiltration aiming to improve the toughness and mechanical integrity was thus carried out using biodegradable poly(ε-caprolactone) (PCL) as an infiltrant since it has shown good biocompatibility together with a high elongation and energy to failure as compared to other medical polymers. Three routes of infiltration were performed including melt infiltration of low molecular weight PCL (Mw ˜ 10,000), solution infiltration by 10 % high molecular weight PCL (Mw ˜ 80,000) and the combination of both melt and solution infiltration of low and high molecular weight PCL. The combination of low and high MW infiltration yielded the greatest increase in the mechanical properties and followed by the melt infiltration of low molecular weight PCL while the use of high MW infiltration yielded limited enhancement. After immersing in simulated body fluid (SBF), no significant changes in flexural properties were seen for both hydroxyapatite and high molecular weight infiltrated sample. However, flexural strength and strain at break of low molecular weight infiltrated sample largely dropped after 7 days of immersion to be closed to those of hydroxyapatite and high molecular weight infiltrated sample. The flexural properties of high-low infiltrated sample also decreased after immersion, but to a less degree and still maintained the greatest values amongst all samples. This could be associated to the difference in degradation of different molecular weight of PCL and the content of polymer infiltration induced by different infiltration routes. Calcium and phosphorus ions in the SBF were quantified and observed to be consumed continuously during immersion for all samples. Newly formed apatite crystals were observed to form on the surface of the infiltrated composites signifying that infiltration did not hinder the bioactivity of the composites.

Styles APA, Harvard, Vancouver, ISO, etc.

6

Prodan, Doina, Marioara Moldovan, Andrea Maria Chisnoiu, Codruța Saroși, Stanca Cuc, Miuța Filip, Georgiana Florentina Gheorghe et al. « Development of New Experimental Dental Enamel Resin Infiltrants—Synthesis and Characterization ». Materials 15, n^o 3 (21 janvier 2022) : 803. http://dx.doi.org/10.3390/ma15030803.

Texte intégral

Résumé :

The aim of the present study was to obtain experimental infiltration materials, intended for the treatment of dental white spots, and to investigate them. Two series of infiltrants (P1–P6)/(P1F–P6F) were obtained, based on different monomer mixtures, without/with glass filler (with fluoride release ability). Each infiltrant from the second series contained the same amount of glass powder, and each infiltrant from the (P–PF) group contained the same resin composition. The characteristics of the experimental infiltrants were investigated by degree of conversion (DC), mechanical strength, water sorption (WS), and fluoride release, in addition to residual monomer for (P1F–P6F) infiltrants. The results were compared with those obtained for commercial Icon infiltrant. For the experimental infiltrants, without/with filler, the recorded DC was in the range of 58.27–89.70%/60.62–89.99%, compared with Icon (46.94%) 24 h after polymerization. The release of fluoride depends on the permeability of the polymer matrix, with respect to the water sorption, which may help to diffuse ions in the storage medium but which can also influence the release of residual monomers. The highest flexural strengths were recorded for the (TEGDMA/HEMA/Bis-GMA) infiltrants (133.94 ± 16.389 MPa/146.31 ± 7.032 MPa). The best experimental infiltrants were P2 and P2F (Bis-GMA/HEMA/TEGDMA).

Styles APA, Harvard, Vancouver, ISO, etc.

7

Yang, Shao Feng, Wei Ping Chen, Meng Yan Han et De Zhi Zhu. « Microstructure and Interface Strength of MMCs Prepared by Pressureless Ni-Induced Infiltration Using Fe Alloy ». Applied Mechanics and Materials 37-38 (novembre 2010) : 652–57. http://dx.doi.org/10.4028/www.scientific.net/amm.37-38.652.

Texte intégral

Résumé :

Metal matrix composites (MMCs) were produced by Ni-induced pressureless infiltration using Fe alloy. The mainly fabrication process was that Ni and Al2O3 powders mixture was pressed and sintered after milled, and then the sintered Al2O3 ceramics were infiltrated by Fe alloy at 1600°C with 4h holding time. While the SEM and EPMA analyses indicated that the interface between ceramics and Fe alloy reaches a full homogeneity after infiltration and Fe alloy could infiltrate Al2O3 ceramic preforms and the maximum infiltration distance was more than 400 μm. This would increase the strength of interfacial due to excellent bonding interface. The fracture strength is about 63.0 MPa.

Styles APA, Harvard, Vancouver, ISO, etc.

8

Stasiak, Katarzyna, Robin Lindsay et Victor H. Engelhard. « Low immunogenicity of intracranial tumors limits immune response to brain malignancies ». Journal of Immunology 204, n^o 1_Supplement (1 mai 2020) : 242.51. http://dx.doi.org/10.4049/jimmunol.204.supp.242.51.

Texte intégral

Résumé :

Abstract The presence of CD8 T cells in tumors, including melanomas, is correlated with longer survival. Cutaneous melanoma is a highly immunogenic malignancy with high rate of dissemination into central nervous system but the brain is considered immunologically privileged due to the blood-brain barrier, which limits T cell entry. To determine if brain tumors are also poorly infiltrated by T cells we evaluated intracranial (IC) and subcutaneous (SC) B16 melanomas expressing different model antigens. CD8 T cells were present in IC tumors 7 days post tumor implantation in B16 melanomas expressing chicken ovalbumin (B16OVA) or influenza M1 protein (B16M1), but infiltrates were only 10% of those observed in SC tumors. We also observed that expression of homing receptor ligands (HRLs) known to mediate T cell infiltration was lower on IC than SC tumor-associated vasculature. Despite the fact that HRL expression decreased over time in tumors grown in both locations, T cell infiltrates increased, suggesting that HRL are not the only factor limiting T cells entry into IC tumors. To determine whether the IC tumor infiltrate size was limited by inefficient stimulation of effectors cells, we vaccinated mice to generate fully activated effector T cells able to recognize tumor associated antigen. Vaccination normalized the infiltrate sizes in IC and SC tumors. Interestingly, this was also dependent on expression of Ag by the tumor cells. This suggests that IC tumors are not able to efficiently elicit a robust immune response, possibly due to limitations on drainage to lymph nodes, while IC tumor vasculature does not impose inherently greater limitations on the ability of T cells to enter.

Styles APA, Harvard, Vancouver, ISO, etc.

9

Weil, Andrew C., Matt E. Kalaycio et James R. Cook. « Pulmonary Infiltration by CLL/SLL in the Presence of Inflammation : Significant or Incidental Finding?. » Blood 114, n^o 22 (20 novembre 2009) : 2352. http://dx.doi.org/10.1182/blood.v114.22.2352.2352.

Texte intégral

Résumé :

Abstract Abstract 2352 Poster Board II-329 Radiographically identified pulmonary infiltrates in patients with CLL are usually secondary to infectious causes. However, a subset of patients develop pathologic leukemic infiltrates. Lung biopsies containing both inflammation and CLL infiltrates are particularly problematic. It is unclear in such cases whether the CLL infiltrate represents a nonspecific “passenger effect” secondary to ongoing inflammation versus a pathologic leukemic infiltrate. Furthermore, it is unknown whether there are clinical factors that would help predict who is at higher risk for pulmonary infiltration by CLL. We retrospectively analyzed 45 transbronchial lung biopsies taken from 37 patients at the Cleveland Clinic between 1999 and 2008. We reviewed the biopsies for evidence of acute or chronic inflammation and involvment by CLL. Acute inflammation in our biopsies consisted of acute pneumonias. Cases displaying a lymphocytic infiltrate suspicious for CLL on routine H&E sections were further investigated by immunohistochemistry. The patients studied were 67.5% male with a median age of 67 (45-83) and a median absolute lymphocyte count of 2.75 (0.12 – 86.08). All patients at the time of diagnosis with CLL had flow cytometery of blood and/or bone marrow demonstrating CD5, CD19 positive B cells consistent with CLL. 72% of all patients were previously treated and 52% of patients had a RAI stage > 2 at the time of their diagnosis with CLL. CLL was identified in 20% of the biopsies. Of the 31.1% of biopsies showing acute inflammation, none had leukemia. CLL infiltration was found in association with and without chronic inflammation in 25% and 30.4% of the biopsies respectively. The median peripheral blood absolute lymphocyte count was 3.64 (1.33 – 86.08) in those with leukemic biopsies and 8.31 (0.12 – 79.12) in those without leukemic biopsies. Furthermore, only 33% of the patients with CLL positive biopsies had a RAI stage ≥ 3. At the time of biopsy, 7 previously treated patients were in remission; none of these cases displayed evidence of CLL in lung tissue. We found that the incidence of leukemic infiltration of lung biopsies did not increase in the presence of inflammation. In fact, the incidence of infiltration of biopsies with inflammation was lower than those without inflammation. These results demonstrate that leukemic infiltration on biopsies with inflammation is uncommon, and suggests that this phenomenon represents true, pathologic infiltration of the tissue by CLL and not a “passenger effect”. To the authors knowledge this is the largest study evaluating the association of inflammation and pathologic infiltration of pulmonary tissue by CLL. Disclosures: No relevant conflicts of interest to declare.

Styles APA, Harvard, Vancouver, ISO, etc.

10

Murphy, Christopher, Erjon Agushi, Zhangjie Su, Rainer Hinz, Federico Roncaroli et David Coope. « Quantitative Diffusion Tensor Imaging (DTI) Analysis Reveals Different Infiltrative Patterns of Oligodendrogliomas and Astrocytomas in Peri-Tumour White Matter ». Neurosurgery 84, n^o 5 (23 mars 2019) : E273. http://dx.doi.org/10.1093/neuros/nyz001.ni2.

Texte intégral

Résumé :

Abstract INTRODUCTION Gliomas are highly infiltrative primary brain tumours. Glioma infiltration is difficult to identify clinically using conventional diagnostic imaging. We used diffusion tensor imaging (DTI) to identify glioma infiltration in peritumour white matter (WM) and characterized differences between histological subtypes. METHODS We recruited 8 patients with a histological diagnosis of grade II or III glioma and 10 healthy controls. We compared fractional anisotropy (FA) maps of each patient against the control group using SPM8 (Matlab 2014a) to identify regions of glioma infiltration. The FA and mean diffusivity (MD) of formerly WM matter tumour regions, infiltrated WM and normal appearing WM were compared with a 2-sample t-test and characterized with respect to normal control data. RESULTS Our results have identified radiological evidence of infiltration in the peri-tumour WM of glioma patients. The infiltrated region of oligodendrogliomas extended further than that of astrocytomas. Oligodendrogliomas preferentially infiltrated larger WM tracts, whereas astrocytomas infiltrated more peripheral WM. In all grades, the 3 regions had significantly different diffusion parameters and there were significant differences between oligodendrogliomas and astrocytomas. CONCLUSION We identified previously unrecognized study wide significant changes in the peri-tumour WM of gliomas. Despite the known propensity of these tumours to infiltrate WM we found no significant DTI changes distant to the tumour. Our DTI results suggest oligodendrogliomas and astrocytomas demonstrate different infiltrative patterns, which highlights the need for astrocytomas and oligodendrogliomas to be studied separately.

Styles APA, Harvard, Vancouver, ISO, etc.

11

Rodríguez-Guerrero, Alejandro, Javier Narciso, Enrique Louis et F. Rodríguez-Reinoso. « Reducing Threshold Pressure for Infiltration of Al-12Si Alloys into Carbon Particle Compacts by Placing a Thin Layer of Sn at the Infiltration Front ». Materials Science Forum 539-543 (mars 2007) : 785–90. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.785.

Texte intégral

Résumé :

The oxide layer that usually covers the surface of liquid aluminum and its alloys, is one of the main factors that hinders infiltration of these alloys into graphite particle compacts. The oxide film increases the threshold pressure for infiltration and the porosity of the resulting composites is large because the wetting at the metal/carbon interface is reduced. Infiltrating graphite compacts with tin requires, however, a much lower pressure, less than half of that required to infiltrate the eutectic Al-12Si alloy. As the surface tension of tin is half that of the Al-12Si alloy, this result indicates that wetting at the Sn/C interface is slightly better. As a result, porosity in the infiltrated samples is reduced. In order to reduce the threshold pressure and improve the properties of Al-Si/graphite composites, a novel method has been used in this work that consists in placing a thin film of tin at the compact end through which infiltration takes place. During the infiltration process the graphite particles are firstly infiltrated by tin, which is pushed by the aluminum alloy, thus avoiding the oxidation of the latter. The method proved to be very effective in reducing the threshold pressure, while keeping almost constant the infiltration rate.

Styles APA, Harvard, Vancouver, ISO, etc.

12

Su, Yu Wu, Chao Zhang, Shan Shan Liu, Liang Yue Pang, Huan Cai Lin et Qing Hui Zhi. « Effect of Thermal Cycling Aging on the Surface Microhardness and Roughness of Resin-Infiltrated Enamel Lesions ». Science of Advanced Materials 13, n^o 3 (1 mars 2021) : 356–63. http://dx.doi.org/10.1166/sam.2021.3925.

Texte intégral

Résumé :

With the widespread use of resin infiltration, its properties have drawn increasing attention. The objective of this study was to investigate the effect of resin infiltration on the surface microhardness and roughness of enamel lesions after thermal cycling aging. Tooth blocks were made from extracted premolars and placed into a control group, resin-infiltrated group or demineralized group. Before and after the aging procedure, the surface microhardness and surface roughness was measured. Before the aging procedure, the surface microhardness of the control group, resin-infiltrated group and demineralized group was 302.14 (±9.77) HV, 146.62 (±8.22) HV, and 28.85 (±2.21) HV (p 0.001), respectively. After the aging procedure, the surface microhardness of the control group, resin-infiltrated group and demineralized group decreased by 9.42%, 16.59%, and 20.75% ( p 0.001), respectively. Before the aging procedure, the surface roughness of the control group, resin-infiltrated group and demineralized group was 0.29 (±0.04) μm, 0.32 (±0.04) μm, and 0.39 (±0.07) μm (p = 0.009), respectively. After the aging procedure, the surface roughness of the control group, resin-infiltrated group and demineralized group increased by 9.85%, 8.31%, and 17.37% (p = 0.634), respectively. Resin infiltration can improve the surface microhardness and surface roughness of demineralized teeth in an artificial enamel caries model. The treatment also shows good aging resistance after thermal cycling. The infiltrant resin provided a suitable material for early enamel caries.

Styles APA, Harvard, Vancouver, ISO, etc.

13

Zhang, Xiao Li, Zhi Hao Jin et Zhen Lin Lu. « The Microstructures and Mechanical Properties of Molybdenum Disilicide Preforms Infiltrated by Aluminum ». Key Engineering Materials 317-318 (août 2006) : 331–34. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.331.

Texte intégral

Résumé :

Infiltrant aluminum was infiltrated into molybdenum disilicide preforms in N2 atmosphere at different temperatures by liquid reactive infiltration processing. The mechanical properties and phase composition of these materials were analyzed and discussed. The experimental results showed that the samples were corresponding to 10 at.% Al averagely after sintered, and consisted of Mo(Al,Si)2 phase and Al-Si alloy phase. High infiltration temperature would lead to Al deficiency mainly in Al-Si alloy phase. The highest bending strength of 737 MPa was reached at infiltration temperature of 1350 °C because the sample had fine and integrated grains, and the strong combination between particles. When the infiltration temperature was higher than 1350 °C, the bending strength of material prepared would decrease because of the phase fragmentation.

Styles APA, Harvard, Vancouver, ISO, etc.

14

Bourell, D. L., R. S. Evans et S. L. Barrows. « High-Temperature Infiltration of Non-Metallic Articles Produced via Selective Laser Sintering ». Materials Science Forum 475-479 (janvier 2005) : 2861–66. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2861.

Texte intégral

Résumé :

There are several commercial processes for producing metallic parts by selective laser sintering (SLS) followed by infiltration of a molten metal at 700-900C. These parts are used in rapid manufacturing and rapid tooling applications. The present work centers around research to produce non-metallic parts infiltrated with materials at temperatures exceeding 1300C. Specific systems include siliconized silicon carbide. Of primary concern are: process control during the high-temperature infiltration; the binder system which must bind powder together during SLS, provide structural strength continuously from room temperature to the infiltration temperature, and react favorably with the infiltrant. This research was funded by State of Texas Technology Development and Transfer Grant Number 003658.

Styles APA, Harvard, Vancouver, ISO, etc.

15

Lizardo, Breno Ferreira, Luciano Machado Gomes Vieira, Juan Carlos Campos Rubio, Tulio Hallak Panzera et João Paulo Davim. « An assessment of thermosetting infiltrate in powder-based composites made by additive manufacturing ». Journal of Composite Materials 53, n^o 7 (2 août 2018) : 873–82. http://dx.doi.org/10.1177/0021998318792296.

Texte intégral

Résumé :

Rapid prototyping for material deposition or additive manufacturing has been widely used for short time production of parts with complex geometry in small series. The three-dimensional printing process needs post-processing to improve the strength, stiffness and/or surface finish of the parts. Printed parts in pristine condition are generally very brittle with a porous structure, so infiltrates have been introduced to improve their mechanical and physical characteristics. This work investigates the effect of two infiltrates, epoxy polymer and cyanoacrylate, under a vacuum pressure system on the mechanical properties of powder-based composites made by three-dimensional printing. Samples printed under pristine and infiltrated conditions were tested under tensile, flexural, compressive and impact loadings. The infiltrated samples achieved superior mechanical properties, especially when the epoxy polymer was applied via a vacuum system. The microstructural analysis showed that the infiltrates were not able to penetrate the entire sample, revealing a porous structure in the centre, mainly when the cyanoacrylate was used. The epoxy polymer infiltrate was able to substantially increase the mechanical performance of three-dimensional samples, being a promising material when higher structural requirements are required.

Styles APA, Harvard, Vancouver, ISO, etc.

16

Movrin, Dejan, Ognjan Luzanin et Vera Guduric. « Using statistically designed experiment to optimize vacuum-assisted post-processing of binder jetted specimens ». Rapid Prototyping Journal 25, n^o 3 (8 avril 2019) : 653–63. http://dx.doi.org/10.1108/rpj-07-2018-0177.

Texte intégral

Résumé :

PurposeThis paper aims to propose a vacuum-assisted post-processing method for use in binder jetted technology. The method is based on six key technological parameters and uses standard, commercially available consumables to achieve improvement in tensile strength, as well as the microstructure and porosity of the infiltrated matrix.Design/methodology/approachSix key technological parameters were systematically varied as factors on three levels, using design of experiment, i.e. definitive screening design. Surface response methodology was used to optimize the process and yield optimal tensile strength for the given range of input factors. Thus obtained, the optimized factor settings were used in a set of confirmation runs, where the result of optimization was experimentally confirmed. To confirm improvement in microstructure of the infiltrated matrix, SEM analysis was performed, while the reduction of porosity was analyzed using mercury porosimetry.FindingsThe obtained results indicate that, compared to its conventional counterpart, the proposed, optimized infiltration method yields improvement in tensile strength which is significant from both the statistical and engineering point of view, while reducing porosity by 3.5 times, using only standard consumables. Scanning electron microscopy examination of fractured specimens’ micrographs also revealed significant morphological differences between the conventional and proposed method of post-processing. This primarily reflects in higher surface area under hardened epoxy infiltrate, which contributes to increased load capacity of specimen cross-section.Research limitations/implicationsAt the present stage of development, the most important limitation of the proposed method is the overall size of models which can be accommodated in standard vacuum impregnation units. Although, in this study, the infiltration method did not prove statistically significant, further investigation is required with models of complex geometry, various sizes and mass arrangements, where infiltration would be more challenging and could possibly result in different findings.Practical implicationsThe most important practical implication of this study is the experimentally verified result of optimization, which showed that tensile strength and matrix microstructure can be significantly improved, using just standard consumables.Social implicationsImproved strength contributes to reduction of material consumption, which, in a longer run, can be beneficial for environment protection and sustainable development.Originality/valueBased on literature review, there have been no previous investigations which studied the tensile strength of infiltrated specimens through design of experiment, which involved specimen preheating temperature, level and duration of vacuum treatment of infiltrate mixture and infiltrated specimens and infiltration method.

Styles APA, Harvard, Vancouver, ISO, etc.

17

Roshidan, Nursamirah, Hanisah Manshor, Alya Naili Rozhan et Ahmad Zahirani Ahmad Azhar. « The Effect of Polyvinyl Alcohol Addition on the Solid Carbon Infusion in Zirconia-Toughened Alumina ». Key Engineering Materials 908 (28 janvier 2022) : 208–22. http://dx.doi.org/10.4028/p-b3me7y.

Texte intégral

Résumé :

This study examines the effect of adding various amount of polyvinyl alcohol (PVA) from 1 wt. % to 5 wt. % as function to produce porosity of the microstructure on Zirconia-Toughened Alumina (ZTA). Porosity is required in this study which aims to increase the efficiency of carbon infiltration on the porous composite through chemical vapor infiltration (CVI). Moreover, carbon production from empty fruit bunch (EFB) was used as a reinforcement on ceramic composites in this system. The microstructure of samples was characterised by using scanning electron microscopy (SEM). The density shows the lowest at 2.864 g/cm3 when the percentage of binder is increased at 4wt.% of PVA without carbon infiltration but shows the highest density value which is 4.107 g/cm3 after carbon is infiltrated. Vickers hardness was used to identify the hardness of samples. It was found that ZTA composite with infiltrated carbon has better hardness (2053HV) with addition of 4wt.% of PVA. However, firing shrinkage showed no effect on the composite with or without carbon infiltration. The structure of crystalline carbon in composite was analyses by X-Ray Diffraction (XRD). Nevertheless, no peak for carbon is observed due to low carbon content and another alternative such as Raman spectroscopy was used to identify the presence of diffused carbon. Based on the result, carbon infiltration on composite will produce better physical and mechanical properties with the help of binders that produce pores for carbon to infiltrate.

Styles APA, Harvard, Vancouver, ISO, etc.

18

Jaffe, Ronald. « Liver Involvement in the Histiocytic Disorders of Childhood ». Pediatric and Developmental Pathology 7, n^o 3 (mai 2004) : 214–25. http://dx.doi.org/10.1007/s10024-003-9876-z.

Texte intégral

Résumé :

The liver can be involved directly, by infiltration, and indirectly—by remote effects—in the histiocytoses of childhood. Langerhans cell disease, the most well recognized of these, infiltrates the liver directly but has a remarkable selectivity for the bile ducts. Early involvement is by Langerhans cell histiocytosis (LCH) infiltration leading to a sclerosing cholangitis and, eventually, biliary cirrhosis. Gamma glutamyl transpeptidase is a sensitive indicator of liver infiltration in a child with LCH. The indirect effects on the liver of LCH elsewhere in the body are mediated through an accompanying macrophage activation syndrome that is most likely responsible for hepatomegaly and hypoalbuminemia but without direct infiltration. These indirect effects are completely reversible. Juvenile xanthogranuloma/xanthoma disseminatum, a related dendritic cell disorder that can have systemic manifestations, has a strikingly different pattern, with a predominantly portal infiltrate spilling over into the adjacent lobule but sparing the biliary tree. The biology of the liver lesions is not clear but regression has been documented. Myeloproliferative disorders and myeloid leukemias can express CD1a and/or S100 protein, mimicking LCH but distinguished by their sinusoidal pattern. The primary macrophage histiocytoses such as the familial hemophagocytic syndromes can lead to severe liver damage. Although a portal lymphohistiocytic infiltrate is most characteristic, it is probably cytokine-mediated hepatocellular damage that can cause substantial functional impairment or even hepatic failure as a presenting feature. Liver involvement in other, more unusual histiocytic disorders, is also illustrated.

Styles APA, Harvard, Vancouver, ISO, etc.

19

Zulfia, Anne. « Al-Si/SiC Metal Matrix Composites Produced by Spontaneous Infiltration ». Advanced Materials Research 277 (juillet 2011) : 21–26. http://dx.doi.org/10.4028/www.scientific.net/amr.277.21.

Texte intégral

Résumé :

Aluminium Silicon reinforced with 50Vf% SiC has been produced by spontaneous infiltration at 900°C for 1 hour. Aluminium infiltrated preforms containing 1%wt Mg mixed with various of Si between 2 and 14wt%, as external dopant. However Al did not infiltrate a preform containing 1wt%Mg but if mixed with Si in the preform generated in more extensive infiltration. Effect of Si on characterisation of pure Al composites by spontaneous infiltration were studied and compared to Al-Si based matrix. Microstructural analysis of MMC as well as mechanical properties were also observed. It was found that increasing of Si content generated lower porosity thus increasing hardness due to aluminium could wet SiC preform well. Although the dopant was uniformly distributed throughout the perform but microstructural analysis and hardness measurements indicate that the resultant composite may not be uniform as infiltration inwards from the top to the bottom of preform.The hardness of Al-Si composites is significantly increased with increasing of Si for both externally and internally doped system. This is associated with decreasing porosity with higher Si in composites.

Styles APA, Harvard, Vancouver, ISO, etc.

20

Lopes Bezerra, Paulo Henrique, Artur Paiva Coutinho, Laurent Lassabatere, Severino Martins dos Santos Neto, Tassia dos Anjos Tenório de Melo, Antonio Celso Dantas Antonino, Rafael Angulo-Jaramillo et Suzana Maria Gico Lima Montenegro. « Water Dynamics in an Infiltration Trench in an Urban Centre in Brazil : Monitoring and Modelling ». Water 14, n^o 4 (9 février 2022) : 513. http://dx.doi.org/10.3390/w14040513.

Texte intégral

Résumé :

Infiltration trenches are compensatory techniques that consist of a reservoir filled with granular material. Their function is to store and infiltrate runoff water generated by rainfall. The objective of this work was to evaluate the hydraulic performance and model the water dynamics of an infiltration trench installed in the city of Recife, Pernambuco, Brazil. For each event, the response time of the infiltration system, the percentage of the infiltrated volume and the dynamics of water storage processes were analyzed as a function of rainfall events. The Puls method was used to model the events. The monitoring data demonstrated that the infiltration trench had a positive performance, infiltrating a large part of the drained volume, even with system overflows. The analyzed events presented an average emptying time of 6 days. The infiltration trench achieved its objective of decreasing the volume drained on the surface. The application of the Puls method in simulations of the monitored events showed satisfactory results in the statistical criteria coefficient of determination, deviation ratio and coefficient of residual mass, obtaining efficient adjustments, apart from a few exceptions. This study allowed us to prove the positive contribution of the trench to the water budget.

Styles APA, Harvard, Vancouver, ISO, etc.

21

Şelte, A., et B. Özkal. « Infiltration Behavior Of Mechanical Alloyed 75 wt% Cu-25 wt% WC Powders Into Porous WC Compacts ». Archives of Metallurgy and Materials 60, n^o 2 (1 juin 2015) : 1565–68. http://dx.doi.org/10.1515/amm-2015-0272.

Texte intégral

Résumé :

AbstractIn this work infiltration behavior of mechanical alloyed 75 wt% Cu – 25 wt% WC powders into porous WC compacts were studied. Owing to their ductile nature, initial Cu powders were directly added to mechanical alloying batch. On the other hand initial WC powders were high energy milled prior to mechanical alloying. Contact infiltration method was selected for densification and compacts prepared from processed powders were infiltrated into porous WC bodies. After infiltration, samples were characterized via X-Ray diffraction studies and microstructural evaluation of the samples was carried out via scanning electron microscopy observations. Based on the lack of solubility between WC and Cu it was possible to keep fine WC particles in Cu melt since solution reprecipitation controlled densification is hindered. Also microstructural characterizations via scanning electron microscopy confirmed that the transport of fine WC fraction from infiltrant to porous WC skeleton can be carried out via Cu melt flow during infiltration.

Styles APA, Harvard, Vancouver, ISO, etc.

22

Novak, Saša, Katja König, Aljaž Ivekovič et Aldo Roberto Boccaccini. « Infiltration of a 3-D Fabric for the Production of SiC/SiC Composites by Means of Electrophoretic Deposition ». Key Engineering Materials 412 (juin 2009) : 237–42. http://dx.doi.org/10.4028/www.scientific.net/kem.412.237.

Texte intégral

Résumé :

Electrophoretic deposition (EPD) was used to infiltrate 2D and 3D SiC fabrics with SiC submicron particles with the aim to verify the potential of the technique for the fabrication of dense SiC/SiC composites. Bulk SiC deposits were first prepared from aqueous suspensions with different dispersants using cathodic and anodic deposition. The most suitable composition of the suspensions and the conditions for the infiltration were determined on the basis of the analysis of green parts formed. Using a specially designed EPD cell a relatively high packing density of SiC particles in infiltrated 2D and 3D SiC-fiber fabrics was achieved.

Styles APA, Harvard, Vancouver, ISO, etc.

23

Basse, P., R. B. Herberman, U. Nannmark, B. R. Johansson, M. Hokland, K. Wasserman et R. H. Goldfarb. « Accumulation of adoptively transferred adherent, lymphokine-activated killer cells in murine metastases. » Journal of Experimental Medicine 174, n^o 2 (1 août 1991) : 479–88. http://dx.doi.org/10.1084/jem.174.2.479.

Texte intégral

Résumé :

While close contact between lymphokine-activated killer (LAK)/adherent, lymphokine-activated killer (A-LAK) cells and tumor cells is believed to be a prerequisite for initiating the events leading to tumor cell lysis, clear evidence for the ability of these effector cells to infiltrate tumors or tumor metastases in vivo still has to be obtained. In the present study, we report that a significant fraction of adoptively transferred A-LAK cells, labeled with fluorochromes for identification, accumulates in lung and liver metastases of the B16 melanoma, the MCA 102 sarcoma and the Lewis lung carcinoma lines. Thus, 5- to 10-fold higher numbers of A-LAK cells were found in the malignant lesions compared to the surrounding normal tissue. The infiltration seemed very heterogeneous after intravenous injection of moderate numbers of A-LAK cells (15 x 10(6)). However, after adoptive transfer of 45 million A-LAK cells, an A-LAK cell/tumor cell ratio higher than 1:1 in most metastases was observed. Surprisingly, approximately 5% of the lung metastases seemed totally resistant to infiltration even though neighboring metastases were highly infiltrated. While substantial infiltration of lung metastases was seen after i.v. injection, significant infiltration of liver metastases was seen only after intraportal injection of the A-LAK cells indicating impaired traffic of intravenous injected A-LAK cells through the lung capillaries. These results present direct evidence that A-LAK cells, upon a proper route of administration, have the potential to migrate to and heavily infiltrate metastases from murine tumors of different origin.

Styles APA, Harvard, Vancouver, ISO, etc.

24

Thammarakcharoen, Faungchat, Waraporn Suvannapruk et Jintamai Suwanprateeb. « Preparation of 3DP Hydroxyapatite/Polycaprolactone Composite by a Novel Sequential Infiltration Technique ». Advanced Materials Research 747 (août 2013) : 170–73. http://dx.doi.org/10.4028/www.scientific.net/amr.747.170.

Texte intégral

Résumé :

In this study, a novel sequential infiltration technique using both high and low molecular mass polymers was developed as a means to improve the toughness and mechanical integrity of three dimensional printed hydroxyapatite compared to typical polymer infiltration technique which employed only single molecular mass polymer. Biodegradable polycaprolactone (PCL, Mw ~ 10,000 designated low or Mw ~ 80,000 designated high) were selected as an infiltrant since it has shown good biocompatibility together with a high elongation and energy to failure as compared to other medical polymers. Characterizations including thermogravimetry analysis, flexural properties, in vitro degradation and liquid absorption were carried out. It was observed that the combination of high and low MW infiltration in sequence yielded greater increase in the flexural modulus, strength, elongation and energy at break than those of using only single molecular mass infiltration. This enhancement in mechanical properties was found to be due to the increase in the content of infiltrated polymer into the samples in combination with the synergic effect of low and high molecular mass polycaprolactone resulting from the sequential infiltration.

Styles APA, Harvard, Vancouver, ISO, etc.

25

-, Andri, et Yuanita Amanda. « The Role of Conventional Chest X-Ray in Detection and Evaluation of Long COVID-19 ». Cermin Dunia Kedokteran 49, n^o 4 (1 avril 2022) : 212. http://dx.doi.org/10.55175/cdk.v49i4.1823.

Texte intégral

Résumé :

A 52-year-old woman came to ER with shortness of breath, fever, and cough with oxygen saturation of 80% on room air. The COVID-19 PCR test was positive. CXR showed it infiltrates ground-glass opacities in both lungs and cardiomegaly. Chest X-ray at discharge from the hospital showed decreased infiltrate and fibrosis in two lung. She came to the ER 4 days later with worsened shortness of breath. CXR showed diffuse infiltrates in both lungs and cardiomegaly. Discussion: COVID-19 patients can develop long-term sequelae and complications (long COVID-19). Although CT is now considered the primary investigation for COVID-19, CXR is still valid for detecting and monitoring its progression. Conclusion: CXR is useful for detecting and monitoring the rapid advancement of lung abnormalities in long COVID-19.Wanita 52 tahun datang ke IGD dengan sesak napas, demam, batuk; dengan saturasi oksigen 80% udara ruangan. Tes PCR COVID-19 positif. Rontgen toraks menunjukkan infiltrat di kedua lapangan paru, ground glass opacities, dan kardiomegali. Rontgen toraks saat keluar rumah sakit menunjukkan penurunan gambaran infiltrat dan fibrosis pada dua lapangan paru. Empat hari setelah keluar rumah sakit pasien kembali sesak napas. Rontgen toraks menunjukkan infiltrat difus dikedua paru dan kardiomegali. Diskusi: Pasien COVID-19 dapat mengalami sekuele jangka panjang dan komplikasi, disebut long COVID-19. Walaupun CT-scan menjadi pendeteksi utama COVID-19, rontgen toraks masih bermanfaat untuk memantau progresi sindrom tersebut.

Styles APA, Harvard, Vancouver, ISO, etc.

26

Andri et Yuanita Amanda. « The Role of Conventional Chest X-Ray in Detection and Evaluation of Long COVID-19 ». Cermin Dunia Kedokteran 49, n^o 4 (1 avril 2022) : 212–13. http://dx.doi.org/10.55175/cdk.v49i4.221.

Texte intégral

Résumé :

A 52-year-old woman came to ER with shortness of breath, fever, and cough with oxygen saturation of 80% on room air. The COVID-19 PCR test was positive. CXR showed it infiltrates ground-glass opacities in both lungs and cardiomegaly. Chest X-ray at discharge from the hospital showed decreased infiltrate and fibrosis in two lung. She came to the ER 4 days later with worsened shortness of breath. CXR showed diffuse infiltrates in both lungs and cardiomegaly. Discussion: COVID-19 patients can develop long-term sequelae and complications (long COVID-19). Although CT is now considered the primary investigation for COVID-19, CXR is still valid for detecting and monitoring its progression. Conclusion: CXR is useful for detecting and monitoring the rapid advancement of lung abnormalities in long COVID-19. Wanita 52 tahun datang ke IGD dengan sesak napas, demam, batuk; dengan saturasi oksigen 80% udara ruangan. Tes PCR COVID-19 positif. Rontgen toraks menunjukkan infiltrat di kedua lapangan paru, ground glass opacities, dan kardiomegali. Rontgen toraks saat keluar rumah sakit menunjukkan penurunan gambaran infiltrat dan fibrosis pada dua lapangan paru. Empat hari setelah keluar rumah sakit pasien kembali sesak napas. Rontgen toraks menunjukkan infiltrat difus dikedua paru dan kardiomegali. Diskusi: Pasien COVID-19 dapat mengalami sekuele jangka panjang dan komplikasi, disebut long COVID-19. Walaupun CT-scan menjadi pendeteksi utama COVID-19, rontgen toraks masih bermanfaat untuk memantau progresi sindrom tersebut. Simpulan: Rontgen toraks berguna untuk deteksi dan memantau kelainan paru pada long COVID-19.

Styles APA, Harvard, Vancouver, ISO, etc.

27

Qi, Le Hua, Ji Ming Zhou, Li Zheng Su, Hai Bo Ouyang et He Jun Li. « Fabrication of C_sf/Mg Composites Using Extrusion Directly Following Vacuum Infiltration - Part 2 : Forming Process Study ». Solid State Phenomena 141-143 (juillet 2008) : 91–96. http://dx.doi.org/10.4028/www.scientific.net/ssp.141-143.91.

Texte intégral

Résumé :

Extrusion directly following vacuum infiltration is a special forming technique that combines the advantages of liquid metal infiltration and semisolid extrusion. The major advantages of this process are elimination of porosity and shrinkage, good surface finish, good dimensional accuracy, high strength to weight ratio and near net shaping. Magnesium matrix composites are fabricated usually through stirring casting, powder forming, injecting deposition, liquid metal infiltration or die casting at present time. However few investigations on magnesium matrix composite are conducted for the specific characteristics of magnesium alloy, such as high chemical activity and easy oxidation. The present paper is focused on Csf/Mg composites obtained via infiltration of porous short carbon fiber preform by liquid Magnesium. The complete experiment setup is designed and fabricated by ourselves, which include the forming molds, the unit for melting the magnesium, the unit for vacuuming and the monitoring and collecting system of forming process parameters. In this method the whole experiment setup is vacuumed firstly. Then the pressurized nitrogen is used to infiltrate the magnesium melt through a porous preform of short carbon fibers. After the infiltration completed, the punch of the press extrude the magnesium-infiltrated preform out of the forming die to form the tubes or bars. X-ray diffraction (XRD), optical and SEM microscopes were used to characterize the infiltration and the microstructure of fabricated composites. The compression test was used to characterize the mechanical properties of fabricated composites. The results show that the preform was infiltrated thoroughly by melt magnesium and the fabricated Csf/Mg composites have excellent mechanical properties compared with the magnesium alloys. Csf/Mg composites should be very promising candidates for automobile parts and portable electronic appliance parts in the future.

Styles APA, Harvard, Vancouver, ISO, etc.

28

Carta, F., N. Chuchueva, C. Gerosa, S. Sionis, R. A. Caria et R. Puxeddu. « Parotid tumours : clinical and oncologic outcomes after microscope-assisted parotidectomy with intraoperative nerve monitoring ». Acta Otorhinolaryngologica Italica 37, n^o 5 (octobre 2017) : 375–86. http://dx.doi.org/10.14639/0392-100x-1089.

Texte intégral

Résumé :

I pazienti sottoposti ad intervento chirurgico di parotidectomia per lesioni benigne e maligne possono presentare disfunzioni temporanee o permanenti del nervo facciale. Il monitoraggio intraoperatorio della motilità facciale è uno strumento ampiamente riconosciuto per la sua utilità nella preservazione del nervo, mentre lefficacia del microscopio operatorio è stata raramente discussa. Gli autori riportano la loro esperienza su 198 parotidectomie consecutive eseguite su 196 pazienti con lausilio del microscopio operatorio e del monitoraggio intraoperatorio del nervo facciale. Centoqurantacinque interventi sono stati eseguiti per lesioni benigne e 53 per neoplasie maligne. Tredici pazienti operati per lesioni benigne hanno presentato un deficit della funzionalità del nervo facciale: 11 hanno sofferto di paralisi temporanea e 2 di paralisi permanente (entrambe di secondo grado). Dieci pazienti affetti da patologia maligna presentavano un interessamento preoperatorio del nervo facciale. Cinque e sei pazienti affetti da patologia maligna senza interessamento preoperatorio del nervo hanno presentato un deficit rispettivamente temporaneo e definitivo (in 2 casi il sacrificio di un ramo del nervo macroscopicamente infiltrato dalla neoplasia fu deciso solo durante la procedura chirurgica). Lincidenza di paralisi definitiva di una singola branca del nervo facciale dopo interventi eseguiti per lesioni che non originavano dal nervo facciale o che non lo infiltravano macroscopicamente (n = 185) è stata del 2,7%. I pazienti trattati per tumori benigni non flogistici del lobo superficiale della ghiandola parotide (n = 91) hanno presentato una paralisi facciale postoperatoria temporanea nel 4,4% dei casi e nessun deficit permanente. Luso combinato del microscopio operatorio e del monitoraggio intraoperatorio del nervo sembra garantire la preservazione del nervo facciale nei pazienti sottoposti a parotidectomia.

Styles APA, Harvard, Vancouver, ISO, etc.

29

Vishnevsky, А. А. « Local infiltration anesthesia by the creeping infiltrate method ». Kazan medical journal 26, n^o 5-6 (24 décembre 2020) : 569–77. http://dx.doi.org/10.17816/kazmj52489.

Texte intégral

Résumé :

In modern surgery, there are a large number of different types of general anesthesia and local anesthesia. This most clearly indicates that there is still no such method of pain relief that could be completely satisfied.

Styles APA, Harvard, Vancouver, ISO, etc.

30

Pratiwi, Yesi Eka, Syarifuddin Kadir et Badaruddin Badaruddin. « ANALISIS INFILTRASI PADA BERBAGAI TUTUPAN LAHAN DI SUB DAS BATI-BATI DAS MALUKA KALIMANTAN SELATAN ». Jurnal Sylva Scienteae 4, n^o 5 (25 octobre 2021) : 928. http://dx.doi.org/10.20527/jss.v4i5.4217.

Texte intégral

Résumé :

Land cover can affect the physical properties of soil related to the pace, volume and capacity of infiltration on a land. The purpose of this research is to know the pace of infiltration and to analyze the large capacity and volume of infiltration on several different land cover in Sub DAS Bati-Bati DAS Maluka. Data collection required is primary data and secondary data. The research method is purposive sampling means the retrieval of infiltration data, laying of infiltrometer tools and soil sampling with the ring samples in the area that can be considered to represent all areas research. The pace of infiltration will be faster on land cover which is overgrown by vegetation such as plantation than only land cover of reeds and shrub. The highest infiltration pace is at a plantation of 84.86 mm, while the lowest in the reeds land cover is 74.67 mm. The infiltration pace is influenced by the physical properties of the soil, when the physical properties of the soil will also increase the infiltration pace. The infiltration capacity is directly proportional to the volume of infiltration, the highest value is on the land cover of the shrub with an average infiltration capacity of 198.1 mm/hr and volume infiltration 125.17 mm3. Lowest value in reeds land cover with average infiltration capacity of 157.58 mm/hr and volume infiltration 114.69 mm3. At Plantation land cover the average value of infiltration capacity is 185.88 mm/hr and the volume of infiltration is 121.58 mm3Tutupan lahan dapat memberikan pengaruh terhadap sifat fisik tanah yang berhubungan dengan laju, kapasitas dan volume infiltrasi pada suatu lahan. Tujuan dari penelitian ini ialah untuk mengetahui laju infiltrasi serta menganalisis besar volume dan kapasitas infiltrasi pada beberapa tutupan lahan yang berbeda di Sub DAS Bati-Bati DAS Maluka. Pengumpulan data yang diperlukan ialah data primer dan data sekunder. Metode penelitian dilakukan secara purposive sampling artinya pengambilan data infiltrasi, peletakan alat infiltrometer dan pengambilan sampel tanah dengan ring sample diarea yang dianggap dapat mewakili seluruh areal yang diteliti. Laju infiltrasi akan semakin cepat pada tutupan lahan yang banyak ditumbuhi oleh vegetasi seperti perkebunan daripada hanya tutupan lahan alang-alang dan semak belukar. Laju infiltrasi paling tinggi ialah pada perkebunan sebesar 84,86 mm, sedangkan paling rendah pada tutupan lahan alang-alang sebesar 74,67 mm. Laju infiltrasi dipengaruhi oleh sifat fisik tanah, saat sifat fisik tanah bagus maka laju infiltrasi juga semakin meningkat. Kapasitas infiltrasi berbanding lurus dengan volume infiltrasi, nilai tertinggi ialah pada tutupan lahan semak belukar dengan rata-rata kapasitas infiltrasi 198,1 mm/jam dan volume infiltrasi 125,17 mm3. Nilai terendah pada tutupan lahan alang-alang dengan rata-rata kapasitas infiltrasi 157,58 mm/jam dan volume infiltrasi 114,69 mm3. Pada tutupan lahan perkebunan nilai rata-rata kapasitas infiltrasi ialah 185,88 mm/jam dan volume infiltrasi sebesar 121,58 mm3.

Styles APA, Harvard, Vancouver, ISO, etc.

31

Chen, H. M., M. Luo, H. C. Wang, P. Fu, D. Yang, X. X. Lin et X. Li. « Investigation on the Freeze Casting Porous Al₂O₃ Ceramic Bodies Infiltrated with Nb-Ti-Al-Cr Alloy by Pressureless Infiltration ». Applied Mechanics and Materials 152-154 (janvier 2012) : 188–92. http://dx.doi.org/10.4028/www.scientific.net/amm.152-154.188.

Texte intégral

Résumé :

This paper adopted freeze casting method to prepare porous Al2O3 ceramic bodies with different volume percentage and interconnected pore channels as the preform. The porous Al2O3 ceramic bodies were pressureless infiltrated with Nb-35Ti-20Al-10Cr alloy (atom percentage, at%) by using electromagnetic induction furnace. The results indicated that there is a well wettability between Nb-35Ti-20Al-10Cr melt and porous Al2O3 ceramic body. And it would be possible to infiltrate Nb-35Ti-20Al-10Cr melt into porous Al2O3 ceramic body through pressureless infiltration. The microstructure observation for the Nb-35Ti-20Al-10Cr/Al2O3 composites demonstrated that it was still retained the layer structure characteristics of the preform. The Nb-35Ti-20Al-10Cr melt was filled into the interconnected pore channels existed in the porous Al2O3 ceramic bodies and the Nb, Ti, Al, Cr alloy elements diffused into the reinforced Al2O3 particles during pressureless infiltration.

Styles APA, Harvard, Vancouver, ISO, etc.

32

Liu, Jie, Huai Xiu Lu, Long Quan Shao, Bin Deng, Yuan Fu Yi, Jie Mo Tian, Wei Wei Zhang et Ning Wen. « Evaluation of Glass Infiltration Speed within Dental CAD/CAM Alumina at Different Temperatures ». Advanced Materials Research 177 (décembre 2010) : 314–17. http://dx.doi.org/10.4028/www.scientific.net/amr.177.314.

Texte intégral

Résumé :

Objective: to investigate glass infiltrating rates (depth/time) within dental CAD/CAM alumina at different temperatures. Methods: micron α-alumina powder was prepared with cold isostastic pressure at 250 MPa and sintered at 1450°C. The presintered alumina specimens were then infiltrated with special glass at 1150°C, 1200°C and 1250 °C. The infiltrating depths and time to form the infiltrate at the different temperatures were evaluated. Results: As the infiltrating temperature increased, the viscosity of the infiltrating glass decreased, and the infiltrating depth increased. A 1 mm infiltration depth into the presintered alumina at 1150°C, 1200°C and 1250°C required 95 min, 22 min and 8 min, respectively. Conclusion: An optimal infiltrating time required to reach a suitable infiltration depth into the presintered alumina was observed at 1200°C, an important finding for clinical applications at this commonly used furnace temperature.

Styles APA, Harvard, Vancouver, ISO, etc.

33

Singh, M., et D. R. Behrendt. « Reactive melt infiltration of silicon-niobium alloys in microporous carbons ». Journal of Materials Research 9, n^o 7 (juillet 1994) : 1701–8. http://dx.doi.org/10.1557/jmr.1994.1701.

Texte intégral

Résumé :

Studies of the reactive melt infiltration of silicon-niobium alloys in microporous carbon preforms prepared by the pyrolysis of a polymer precursor have been carried out using modeling, DTA, and melt infiltration. Mercury porosimetry results indicate a very narrow pore size distribution with virtually all the porosity within the carbon preforms open to infiltrants. The morphology and amount of the residual phases (niobium disilicide and silicon) in the infiltrated material can be tailored according to requirements by careful control of the properties (pore size and pore volume) of the porous carbon preforms and alloy composition. The average room temperature four-point fiexural strength of a reaction-formed silicon carbide material (made by the infiltration of medium pore size carbon preform with Si–5 at. % Nb alloy) is 290 ± 40 MPa (42 ± 6 ksi) and the fracture toughness is 3.7 ± 0.3 . The fiexural strength decreases at high temperatures due to relaxation of residual thermal stresses and the presence of free silicon in the material.

Styles APA, Harvard, Vancouver, ISO, etc.

34

Trophymov, P. N., O. V. Antonova, V. R. Khairutdinov, I. E. Belousova et A. V. Samtsov. « Pathomorphological changes in patients with Jessner>s lymphocytic infiltrate of skin, reticular erythematous mucinosis and lupus tumidus ». Vestnik dermatologii i venerologii 91, n^o 6 (24 décembre 2015) : 41–49. http://dx.doi.org/10.25208/0042-4609-2015-91-6-41-49.

Texte intégral

Résumé :

Jessner’s lymphocytic infiltrate of skin, reticular erythematous mucinosis and lupus tumidus are the group of rare, insufficiently explored dermatosis with common clinical and histological features, whose nosology is controversial today. Plasmacytoid dendritic cells play the key role in autoimmune disease induction The target of our study was the analysis of pathomorphological features of lesional skin and the research of plasmacytoid dendritic cells in the skin of patients with Jessner’s lymphocytic infiltrate of skin, reticular erythematous mucinosis and lupus tumidus. Material and methods. Histological and indirect immunohistochemistry examination (anti-CD123 antibodies) of lesional skin of 36 patients was held (JLIS - 12, REM - 10, LT - 14) and 10 healthy people. Result. The main pathomorphological changes of skin in all groups were found in dermis: dense perivascular and perifollicular infiltration and deposit of mucin between collagen fibers. Deposits of mucin in papillary dermis were found between patients with JLIS, REM and LT in 10/12 (83%), 7/10 (70%) and 12/14 (86%) of cases, there were no mucin found in skin of healthy people 0/10 (0%) In all dermatosis the distribution of CD123 cells in lesional skin, in immunohistochemistry study, was corresponded clusters model of infiltrate - plasmacytoid DC concentrate in groups around vessels of superficial and profundus networks and perivascular. The comparative analysis of density and localization of perivascular infiltration, number of CD123-cells and their correspondence in dermis perivascular infiltrates didn’t reveal statistically significant differences between JLIS, REM and LT. Results. Our results allow us to consider JLIS and LT as identical decease, and REM as similar in clinical-pathomorphological features dermatosis.

Styles APA, Harvard, Vancouver, ISO, etc.

35

Smith, Sarah M., John W. Scott et Jerry A. Bartz. « The Inheritance of Bacterial Soft Rot Tolerance through Stem Scar Water Infiltration in Tomato ». HortScience 41, n^o 4 (juillet 2006) : 990D—990. http://dx.doi.org/10.21273/hortsci.41.4.990d.

Texte intégral

Résumé :

When tomato (Lycopersicon esculentum Mill.) fruit come in contact with water at the packing house dump tanks, they can infiltrate water through the stem scar. If the water is infested with Erwinia carotovora, the fruit can infiltrate the bacteria, which will later develop into bacterial soft rot. To determine the inheritance of low water infiltration and thus tolerance to soft rot, a complete diallel was produced using six parents that infiltrate different amounts of water. The parents and hybrids were grown in a completely randomized block design with three blocks and 10 plants per block. The amount of water infiltrated by the fruit was measured by the change in weight after the fruit were immersed in water in a pressure cooker for 2 min. Both general combining ability (GCA) and specific combining ability (SCA) were significant, with GCA having a higher significance than SCA. There appeared to be a cytoplasmic effect on water uptake, where less water was taken up when the low-uptake parent was used as a female. When orthogonal contrasts were performed on reciprocal hybrids from parents that were significantly different, 33% of them were significantly different.

Styles APA, Harvard, Vancouver, ISO, etc.

36

Barros, Enicléia Nunes de Sousa, et Saymon Martin Boaventura. « ESTUDO EXPERIMENTAL DO DESEMPENHO DE PAVIMENTOS PERMEÁVEIS COMO ALTERNATIVA DE REDUÇÃO DO ESCOAMENTO SUPERFICIAL EM ÁREAS URBANAS ». REEC - Revista Eletrônica de Engenharia Civil 15, n^o 2 (5 juin 2020) : 300–313. http://dx.doi.org/10.5216/reec.v15i2.61831.

Texte intégral

Résumé :

RESUMO: O processo de urbanização das cidades sem o adequado planejamento de uso do solo provoca uma crescente impermeabilização deste, levando a constantes cheias nos centros urbanos. Entende-se que os sistemas tradicionais de drenagem resolvem apenas parte do problema, pois não agem nas causas mas somente nos efeitos. Nesse sentido o presente trabalho tem como objetivo avaliar o desempenho do pavimento permeável em relação à capacidade de infiltração das águas pluviais, visando à redução do escoamento superficial em áreas urbanas; para isso foi realizada a simulação chuvas para obter o escoamento por meio da equação de precipitação de Palmas-TO, onde foi possível aferir parâmetros de infiltração e escoamento; também foram produzidos e ensaiados blocos em concreto poroso para avaliar sua capacidade de infiltração. Na simulação efetuada sobre o pavimento permeável em blocos intertravados observou-se que ocorreu uma absorção da precipitação nos 9 minutos iniciais; já na simulação realizada sobre os blocos vazados percebeu-se que neste praticamente não ocorreu escoamento superficial. Os blocos em concreto poroso demonstraram uma ótima capacidade de infiltração, conseguindo comportar em seu interior 7,2 litros, o que significa uma infiltração instantânea de 7,2mm de chuva. ABSTRACT: The process of urbanization of cities without the adequate planning of land use causes a growing waterproofing of this, leading to constant floods in urban centers. It is understood that traditional drainage systems solve only part of the problem, as they do not act on causes but only on the effects. In this sense, the present work aims to evaluate the performance of the permeable pavement in relation to the infiltration capacity of rainwater, aiming at reducing surface runoff in urban areas; for this, the simulation was performed rains to obtain the flow through the Palmas-TO precipitation equation, where it was possible to measure infiltration and flow parameters; blocks were also produced and tested in porous concrete to assess their ability to infiltrate. In the simulation carried out on the permeable pavement in interlocked blocks it was observed that precipitation was absorbed in the initial 9 minutes; already in the simulation carried out on the leaked blocks it was noticed that in this practically no surface runoff occurred. The porous concrete blocks demonstrated an excellent infiltration capacity, managing to accommodate 7.2 liters inside, which means an instant infiltration of 7.2mm of rain.

Styles APA, Harvard, Vancouver, ISO, etc.

37

Batista, Mariana, Diana Ferreira, Francisca Morgado, José Carlos Cardoso, Maria José Julião et Margarida Gonçalo. « Infiltração Cutâneo-Mucosa Perioral / Perioral mucocutaneous infiltration ». Journal of the Portuguese Society of Dermatology and Venereology 76, n^o 2 (29 mai 2018) : 205–8. http://dx.doi.org/10.29021/spdv.76.2.844.

Texte intégral

Résumé :

Apresenta-se o caso de uma mulher de 75 anos, caucasiana, com achados clínicos compatíveis com sialadenite esclerosante crónica e discutem-se os achados laboratoriais, histológicos e radiológicos que permitiram estabelecer o diagnóstico de uma Doença relacionada com IgG4. Discutem-se os critérios de diagnóstico, tratamento e evolução clínca da doente.

Styles APA, Harvard, Vancouver, ISO, etc.

38

Lilbæk, G., et J. W. Pomeroy. « Evidence for enhanced infiltration of ion load during snowmelt ». Hydrology and Earth System Sciences Discussions 7, n^o 1 (24 février 2010) : 1431–57. http://dx.doi.org/10.5194/hessd-7-1431-2010.

Texte intégral

Résumé :

Abstract. Meltwater ion concentration and infiltration rate into frozen soil both decline rapidly as snowmelt progresses. Their temporal association is highly non-linear and a covariance term must be added in order to use time-averaged values of snowmelt ion concentration and infiltration rate to calculate chemical infiltration. The covariance is labelled enhanced infiltration and represents the additional ion load that infiltrates due to the timing of high meltwater concentration and infiltration rate. Previous assessment of the impact of enhanced infiltration has been theoretical; thus, experiments were carried out to examine whether enhanced infiltration can be recognized in controlled laboratory settings and to what extent its magnitude varies with soil moisture. Three experiments were carried out: dry soil conditions, unsaturated soil conditions, and saturated soil conditions. Chloride solution was added to the surface of frozen soil columns; the concentration decreased exponentially over time to simulate snow meltwater. Infiltration excess water was collected and its chloride concentration and volume determined. Ion load infiltrating the frozen soil was specified by mass conservation. Results showed that infiltrating ion load increased with decreasing soil moisture as expected; however, the impact of enhanced infiltration increased considerably with increasing soil moisture. Enhanced infiltration caused 2.5 times more ion load to infiltrate during saturated conditions than that estimated using time-averaged ion concentrations and infiltration rates alone. For unsaturated conditions, enhanced infiltration was reduced to 1.45 and for dry soils to 1.3. Reduction in infiltration excess ion load due to enhanced infiltration increased slightly (2–5%) over time, being greatest for the dry soil (45%) and least for the saturated soil (6%). The importance of timing between high ion concentrations and high infiltration rates was best illustrated in the unsaturated experiment, which showed large inter-column variation in enhanced ion infiltration due to variation in this temporal covariance.

Styles APA, Harvard, Vancouver, ISO, etc.

39

Lilbæk, G., et J. W. Pomeroy. « Laboratory evidence for enhanced infiltration of ion load during snowmelt ». Hydrology and Earth System Sciences 14, n^o 7 (29 juillet 2010) : 1365–74. http://dx.doi.org/10.5194/hess-14-1365-2010.

Texte intégral

Résumé :

Abstract. Meltwater ion concentration and infiltration rate into frozen soil both decline rapidly as snowmelt progresses. Their temporal association is highly non-linear and a covariance term must be added in order to use time-averaged values of snowmelt ion concentration and infiltration rate to calculate chemical infiltration. The covariance is labelled enhanced ion infiltration and represents the additional ion load that infiltrates due to the timing of high meltwater concentration and infiltration rate. Previous assessment of the impact of enhanced ion infiltration has been theoretical; thus, experiments were carried out to examine whether enhanced infiltration can be recognized in controlled laboratory settings and to what extent its magnitude varies with soil moisture. Three experiments were carried out: dry soil conditions, unsaturated soil conditions, and saturated soil conditions. Chloride solutions were added to the surface of frozen soil columns; the concentration decreased exponentially over time to simulate snow meltwater. Infiltration excess water was collected and its chloride concentration and volume determined. Ion load infiltrating the frozen soil was specified by mass conservation. Results showed that infiltrating ion load increased with decreasing soil moisture as expected; however, the impact of enhanced ion infiltration increased considerably with increasing soil moisture. Enhanced infiltration caused 2.5 times more ion load to infiltrate during saturated conditions than that estimated using time-averaged ion concentrations and infiltration rates alone. For unsaturated conditions, enhanced ion infiltration was reduced to 1.45 and for dry soils to 1.3. Reduction in infiltration excess ion load due to enhanced infiltration increased slightly (2–5%) over time, being greatest for the dry soil (45%) and least for the saturated soil (6%). The importance of timing between high ion concentrations and high infiltration rates was best illustrated in the unsaturated experiment, which showed large inter-column variation in enhanced ion infiltration due to variation in this temporal covariance.

Styles APA, Harvard, Vancouver, ISO, etc.

40

Balogun, Shuaib Adesina, Adam Steiner et Mark D. Losego. « Kinetics of TiCl₄ Vapor Phase Infiltration (VPI) into PMMA and the Resulting Thermophysical and Optical Properties of the TiO_x -PMMA Hybrids ». ECS Meeting Abstracts MA2022-02, n^o 31 (9 octobre 2022) : 1143. http://dx.doi.org/10.1149/ma2022-02311143mtgabs.

Texte intégral

Résumé :

Vapor phase infiltration (VPI) is a post-polymerization modification technique that imbues inorganic materials into polymers to create organic-inorganic hybrid materials with new properties distinct from the parent polymer. While several VPI precursor-polymer chemistries have been explored, a lack of chemical intuition remains for fully understanding the thermodynamics and kinetics that govern the VPI process. This study seeks to continue to build this knowledge by examining the VPI process kinetics for TiO2 infiltration into PMMA via the use of TiCl4 and H2O precursors. In this research, polymethylmethacrylate / TiO2 hybrid materials are prepared using VPI. The depth of infiltration of the TiO2species into ~200 nm PMMA thin films is studied using x-ray photoelectron spectroscopy (XPS), Fourier-transform infrared (FTIR) spectroscopy and spectroscopic ellipsometry. The kinetics for TiCl4 infiltration increases with both VPI process temperature and TiCl4 exposure time. However, the rates of infiltration are considerably slower than those observed in the more commonly studied trimethylaluminum (TMA) / PMMA system. Even at 150 °C, process times of at least 12 hours are required to fully infiltrate a 200 nm PMMA film whereas using TMA similar films are fully infiltrated within 1 hour at the same process temperature. Films that we believe to be fully infiltrated at 150 °C and 24 hours of TiCl4 exposure have a 6 at% Ti in the innermost bulk, as determined by XPS. Interestingly, unlike AlOx-PMMA hybrids, these TiOx – PMMA hybrids exhibit significant changes in their optical properties. Increased titanium loading leads to a 4% increase in refractive index and increased UV absorbance in the UV range of 270-350nm. Furthermore, films infiltrated at 150 °C and 24 hours of TiCl4 exposure had a 50 % and 70 % reduction in coefficients of thermal expansion (CTE) below and above Tg respectively. Reduced CTE trends with increased titanium loading. We will discuss possible opportunities to use these new properties for various applications. This project is supported by the Laboratory Directed Research and Development program at Sandia National Laboratories, a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.

Styles APA, Harvard, Vancouver, ISO, etc.

41

Faveeuw, C., M. C. Gagnerault et F. Lepault. « Expression of homing and adhesion molecules in infiltrated islets of Langerhans and salivary glands of nonobese diabetic mice. » Journal of Immunology 152, n^o 12 (15 juin 1994) : 5969–78. http://dx.doi.org/10.4049/jimmunol.152.12.5969.

Texte intégral

Résumé :

Abstract The nonobese diabetic mouse is a relevant model for insulin-dependent diabetes mellitus which results from the destruction of pancreatic beta cells by mononuclear cells infiltrating the islets of Langerhans. Other organs such as salivary glands display inflammatory infiltration. Using immunohistochemical and flow cytometry analyses, we have studied the expression of diverse homing and adhesion molecules in salivary glands and the pancreas in nonobese diabetic mice. In salivary glands, ICAM-1 was expressed by endothelial and dendritic cells within the lymphocytic infiltration. HEV-like structures expressing PNAd were observed in the areas of lymphocytic infiltration whereas MAdCAM-1 was absent. Lymphocytes infiltrating salivary glands expressed LFA-1 and Pgp-1 although Mel-14 Ag was absent. In infiltrated islets, ICAM-1 was expressed by endothelial cells, dendritic cells, and mononuclear cells. We confirm the presence of HEV-like structures expressing MAdCAM-1 and PNAd in inflamed islets. With regard to peripheral lymphocytes, the proportion of CD4 and CD8 cells expressing Mel-14 was decreased in the infiltrated islets, whereas the expression of LFA-1, Pgp-1, and LPAM-1/2 was increased. B lymphocytes exhibited up-regulation of LPAM-1/2. Moreover, the proportion of CD4, CD8, and B lymphocytes expressing CD69 was increased in the pancreas. These results indicate that first, infiltration of islets of Langerhans results at least partly from modifications of adhesion molecule expression in the pancreas, which allow extravasation of mononuclear cells into the islets via at least three different pathways; and second, that activated cells are concentrated in the infiltrates as compared with peripheral lymphoid organs.

Styles APA, Harvard, Vancouver, ISO, etc.

42

Bison, Karla Stange, Mariza Schuster Bueno et Alan Pinheiro de Paula. « Investigação policial e limites do agente infiltrado nas organizações criminosas ». Academia de Direito 4 (11 avril 2022) : 645–68. http://dx.doi.org/10.24302/acaddir.v4.3916.

Texte intégral

Résumé :

O presente artigo visa analisar o método investigativo de infiltração policial em organizações criminosas e os limites que devem ser impostos aos agentes enquanto infiltrados, uma vez que a não observância dos limites impostos pode acabar prejudicando e causando nulidades ao processo criminal que se utilizar das provas assim obtidas. Ainda, analisa-se os aspectos legislativos, as primeiras e mais conhecidas organizações criminosas nascidas no Brasil e outros métodos de investigação trazidos pela Lei n. 12.850/2013. Assim, questiona-se: Quais os limites impostos ao agente infiltrado para a obtenção de provas lícitas? No que se refere à metodologia, utiliza-se o método dedutivo, através da técnica de pesquisa bibliográfica, com base na legislação pertinente e doutrinas.

Styles APA, Harvard, Vancouver, ISO, etc.

43

Carvalhaes, Silvia Mandello, Andy Petroianu, Mauro Augusto Tostes Ferreira, Virgínea Magalhães de Barros et Raquel Virgínea Lopes. « Assesment of the treatment of earlobe keloids with triamcinolone injections, surgical resection, and local pressure ». Revista do Colégio Brasileiro de Cirurgiões 42, n^o 1 (février 2015) : 09–13. http://dx.doi.org/10.1590/0100-69912015001003.

Texte intégral

Résumé :

OBJECTIVE: To evaluate the combined treatment of ear lobe keloids. METHODS: We studied 46 consecutive patients with 81 ear lobe keloids. Patients underwent local infiltration of triamcinolone acetonide (TCN) at concentrations of 40mg/ml (Group 1), 20 mg/ml (Group 2) and 10mg/ml (Group 3). The volume of TCN infiltrate varied according to the size of the lesion. Treatment consisted of three monthly injections before surgery, excision of keloid in the fourth month and perioperative infiltration, followed by two more leaks TCN within two months. Patients used earrings pressure on the scar after operation for four months. The pressure exerted by earrings in the ear lobe was measured electronically. Post-treatment follow-up of patients was 24 months. RESULTS: TCN at concentrations of 20mg/ml and 40mg/ml were effective for the treatment of keloids, no difference between the groups (p = 0.58). However, patients in which TCN was infiltrated the 10mg/ml had poor involution of keloid and the study of this group was stopped. CONCLUSION: the combination of infiltration TCN month to 20 mg/mL (1.2mg to 2.0mg per mm3 TCN injury), surgical excision and pressure application device is effective for treatment of keloid ear lobe.

Styles APA, Harvard, Vancouver, ISO, etc.

44

Sousa, Ivna Sorelly de Arruda, Caroline Mesquita Barroso, Mariana de Saboia Filgueiras et Nara Sousa Rodrigues. « INFILTRANTE RESINOSO E SUA AÇÃO SOBRE MANCHAS BRANCAS NO ESMALTE : UMA REVISÃO DE LITERATURA ». Brazilian Journal of Case Reports 2, Suppl.4 (4 novembre 2022) : 31. http://dx.doi.org/10.52600/2763-583x.bjcr.2022.2.suppl.4.31.

Texte intégral

Résumé :

Introdução: O infiltrante resinoso é uma opção de tratamento para lesões de mancha branca, pois age preenchendo as microporosidades da lesão pela infiltração de uma resina fotopolimerizável de baixa viscosidade. Ele objetiva mascarar a lesão, fortalecendo e estabilizando o esmalte desmineralizado. Objetivo: O presente estudo tem o objetivo de avaliar, através de uma revisão de literatura, a eficácia do infiltrante resinoso como tratamento de lesões de mancha branca. Metodologia: Para o presente estudo, foi utilizada as bases de dados PUBMED e o Portal Regional da Biblioteca Virtual em Saúde, utilizando as seguintes palavras-chave “white spot lesions” e “resin infiltrant”. Dos 71 artigos encontrados, foram selecionados 8. Foram incluídos ensaios clínicos randomizados publicados entre 2012 e 2022 e excluídos os estudos de caso e revisões de literatura, além dos artigos que não se relacionavam ao objetivo do trabalho. Revisão de literatura: O infiltrante resinoso permite tratar a maioria das lesões cariosas incipientes após o preparo superficial do esmalte com ácido clorídrico a 15%. Este tratamento também se mostrou eficaz no tratamento de manchas brancas devido à fluorose e hipomineralização. Não houve consenso sobre a estabilidade de cor após a aplicação do infiltrante resinoso. Conclusão: Foi possível observar a eficácia do infiltrante resinoso na melhora da aparência estética dos dentes com manchas brancas.

Styles APA, Harvard, Vancouver, ISO, etc.

45

Kelley, Forrest, et Walter Eshenaur. « Irrigate, Infiltrate, Automate. Upper Villa Infiltration and Reuse Project ». Proceedings of the Water Environment Federation 2017, n^o 6 (1 janvier 2017) : 4675–93. http://dx.doi.org/10.2175/193864717822156361.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

46

Krok, Magdalena, Ewa Wróblewska-Czajka, Joanna Kokot, Anna Micińska, Edward Wylęgała et Dariusz Dobrowolski. « Retrospective Analysis of Sterile Corneal Infiltrates in Patients with Keratoconus after Cross-Linking Procedure ». Journal of Clinical Medicine 11, n^o 3 (25 janvier 2022) : 585. http://dx.doi.org/10.3390/jcm11030585.

Texte intégral

Résumé :

Background: This paper’s objective is to analyze patients with keratoconus who developed sterile infiltrate after corneal collagen cross-linking (CXL), and to evaluate possible risk factors for their occurrence. Methods: 543 medical histories of patients after cross-linking (Epi-off, Epi-on) procedure performed according to the Dresden protocol were analyzed retrospectively. Results: Sterile corneal infiltrates occurred in four men (0.7%) in the age range (16–28) years, the average age being 20.3. The average time from procedure to onset of symptoms was 3.5 days (2–5 days). Inflammatory infiltration resolved in all patients, leaving scars on corneal stroma in two patients. Corneal healing time ranged from 4–12 weeks. In vivo confocal microscopy (IVCM), round inflammatory cells, and Langerhans cells in the epithelium and Bowman’s layer were observed at the site of infiltration. The Optical coherence tomography (OCT) shows hyperreflective lesions of various sizes which decreased over time. The corneal topographic parameters and Best-corrected visual acuity (BCVA) improved after the CXL procedure in all of the described cases. Conclusions: Most likely, damage to the epithelium and the phototoxic effect of the procedure is of significant importance in the formation of sterile corneal infiltrates. Appropriate classification and selection of CXL procedures in combination with protective measures in people at risk may have an overwhelming impact on the incidence of this complication.

Styles APA, Harvard, Vancouver, ISO, etc.

47

Khurelbaatar, Ganbaatar, Manfred van Afferden, Maximilian Ueberham, Michael Stefan, Stefan Geyler et Roland A. Müller. « Management of Urban Stormwater at Block-Level (MUST-B) : A New Approach for Potential Analysis of Decentralized Stormwater Management Systems ». Water 13, n^o 3 (31 janvier 2021) : 378. http://dx.doi.org/10.3390/w13030378.

Texte intégral

Résumé :

Cities worldwide are facing problems to mitigate the impact of urban stormwater runoff caused by the increasing occurrence of heavy rainfall events and urban re-densification. This study presents a new approach for estimating the potential of the Management of Urban STormwater at Block-level (MUST-B) by decentralized blue-green infrastructures here called low-impact developments (LIDs) for already existing urban environments. The MUST-B method was applied to a study area in the northern part of the City of Leipzig, Germany. The Study areas was divided into blocks smallest functional units and considering two different soil permeability and three different rainfall events, seven scenarios have been developed: current situation, surface infiltration, swale infiltration, trench infiltration, trough-trench infiltration, and three different combinations of extensive roof greening, trough-trench infiltration, and shaft infiltration. The LIDs have been simulated and their maximum retention/infiltration potential and the required area have been estimated together with a cost calculation. The results showed that even stormwater of a 100 year rainfall event can be fully retained and infiltrated within the blocks on a soil with low permeability (kf = 10−6 m/s). The cost and the required area for the LIDs differed depending on the scenario and responded to the soil permeability and rainfall events. It is shown that the MUST-B method allows a simple down- and up-scaling process for different urban settings and facilitates decision making for implementing decentralized blue-green-infrastructure that retain, store, and infiltrate stormwater at block level.

Styles APA, Harvard, Vancouver, ISO, etc.

48

Grewal, I. S., B. J. Rutledge, J. A. Fiorillo, L. Gu, R. P. Gladue, R. A. Flavell et B. J. Rollins. « Transgenic monocyte chemoattractant protein-1 (MCP-1) in pancreatic islets produces monocyte-rich insulitis without diabetes : abrogation by a second transgene expressing systemic MCP-1. » Journal of Immunology 159, n^o 1 (1 juillet 1997) : 401–8. http://dx.doi.org/10.4049/jimmunol.159.1.401.

Texte intégral

Résumé :

Abstract Monocyte chemoattractant protein-1 (MCP-1) is a CC chemokine that attracts monocytes and T lymphocytes in vitro; however, its in vivo functions are poorly understood. To address this question, we constructed transgenic mice expressing MCP-1 controlled by an insulin promoter. These mice developed a chronic insulitic infiltrate composed of F4/80+ monocytes with minor populations of CD4+, CD8+, and B220+ cells. Despite persistent transgene expression, the insulitis never progressed, and blood glucose levels remained normal. Thus, MCP-1 alone is sufficient to elicit a monocytic infiltrate, but not to activate elicited cells. These results differ from those obtained with another transgenic model using the mouse mammary tumor virus long terminal repeat, in which mice expressed substantial MCP-1 in several organs but had no infiltrates. However, mice expressing both transgenes had minimal insulitis, indicating that high systemic levels of MCP-1 prevented monocytes from responding to local MCP-1. Thus, the ability of MCP-1 to elicit monocytic infiltration depends on its being expressed at low levels in an anatomically restricted area.

Styles APA, Harvard, Vancouver, ISO, etc.

49

Bennani, A. C., J. Lary, A. Nrhira, L. Razouki, J. Bize et N. Nivault. « Wastewater Treatment of Greater Agadir (Morocco) : An Original Solution for Protecting the Bay of Agadir by Using the Dune Sands ». Water Science and Technology 25, n^o 12 (1 juin 1992) : 239–45. http://dx.doi.org/10.2166/wst.1992.0355.

Texte intégral

Résumé :

The wastewater treatment by infiltration-percolation plant at Ben Sergao (a suburb of Agadir, Morocco) foreshadows the installation which will be able to be built for Greater Agadir (first fraction: 40,000 m3/d). The present plant treats 1,000 m3/d of highly concentrated raw effluents which after being decanted in an anaerobic stabilization pond are infiltrated into 5 infiltration basins of 1,500 m2 each, constituted by a bed 2 metres thick of eolian sand drained at its base. The decanted water infiltrates at the rate of one metre per day. With this process 100 % of the suspended matter, and 95 % of the chemical oxygen demand are removed, 85 % of the nitrogen is oxidized. The parasites are entirely eliminated and the number of fecal coliforms and streptococci is made 10,000 to 100,000 times smaller. A series of experiments of irrigation by the treated effluents is under way.

Styles APA, Harvard, Vancouver, ISO, etc.

50

Dovbeshko, G. I., O. M. Fesenko, V. V. Boyko, V. R. Romanyuk, V. S. Gorelik, V. N. Moiseyenko, V. B. Sobolev et V. V. Shvalagin. « Secondary Emission From Synthetic Opal Infiltrated by Colloidal Gold and Glycine ». Ukrainian Journal of Physics 57, n^o 2 (15 février 2012) : 154. http://dx.doi.org/10.15407/ujpe57.2.154.

Texte intégral

Résumé :

A comparison of the secondary emission (photoluminescence) and Bragg reflection spectra of photonic crystals (PC), namely, synthetic opals, opals infiltrated by colloidal gold, glycine, and a complex of colloidal gold with glycine is performed. The infiltration of colloidal gold and a complex of colloidal gold with glycine into the pores of PC causes a short-wavelength shift (about 5–15 nm) of the Bragg reflection and increases the intensity of this band by 1.5–3 times. In photoluminescence, the infiltration of PC by colloidal gold and colloidal gold with glycine suppresses the PC emission band near 375–450 nm and enhances the shoulder of the stop-zone band of PC in the region of 470–510 nm. The shape of the observed PC emission band connected with defects in synthetic opal is determined by the type of infiltrates and the excitation wavelength. Possiblemechanisms of the effects are discussed.

Styles APA, Harvard, Vancouver, ISO, etc.

Articles de revues sur le sujet « Infiltrato »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres