WorldWideScience

Sample records for calcaneo con laser

  1. Calcaneo-valgus deformity.

    Science.gov (United States)

    Evans, D

    1975-08-01

    A discussion of the essential deformity in calcaneo-valgus feet develops a theme originally put forward in 1961 on the relapsed club foot (Evans 1961). Whereas in the normal foot the medial and lateral columns are about equal in length, in talipes equino-varus the lateral column is longer and in calcaneo-valgus shorter than the medial column. The suggestion is that in the treatment of both deformities the length of the columns be made equal. A method is described of treating calcaneo-valgus deformity by inserting cortical bone grafts taken from the tibia to elongate the anterior end of the calcaneus.

  2. Calcaneo-Scaphoid Coalition.

    Science.gov (United States)

    Seddon, H J

    1933-02-01

    Calcaneo-scaphoid coalition occurs in a number of forms, having one feature in common, namely, a skeletal abnormality of the calcaneo-scaphoid gap. The condition is congenital, but nothing is known of its causation. Ranking at first as merely an anatomical curiosity, it was later recognized to be frequently associated with spasmodic flat-foot. Probably 25% of all cases of spasmodic flat-foot show this skeletal anomaly in some form or other.Clinically, this variety of spasmodic flat-foot is indistinguishable from the better-known condition in which the bones are apparently normal. Diagnosis made radiographically; essential that an oblique lateral view of the foot should be taken.Causal relation of the condition to peroneal spasm.All the usual forms of treatment employed for the relief of spasmodic flat-foot fail when a calcaneo-scaphoid coalition is present. Resection of the offending bar is of no proven value, but may be worth further trial. If symptoms persist, subastragaloid arthrodesis is necessary.

  3. The calcaneo-stop procedure.

    Science.gov (United States)

    Usuelli, F G; Montrasio, U Alfieri

    2012-06-01

    Flexible flatfoot is one of the most common deformities. Arthroereisis procedures are designed to correct this deformity. Among them, the calcaneo-stop is a procedure with both biomechanical and proprioceptive properties. It is designed for pediatric treatment. Results similar to endorthesis procedure are reported. Theoretically the procedure can be applied to adults if combined with other procedures to obtain a stable plantigrade foot, but medium-term follow up studies are missing.

  4. [Loosening of a Calcaneo-Stop Screw after Trampolining].

    Science.gov (United States)

    Trieb, K; Fingernagel, T; Petershofer, A; Hofstaetter, S G

    2015-06-01

    Flexible flatfoot is a common malalignment in the paediatric population. Arthroereisis with a calcaneo-stop screw is an effective surgical procedure for treating juvenile flexible flatfoot after conservative measures have been fully exploited. In the present report, we describe the case of a loosening of a calcaneo-stop screw in a 12-year-old youth after excessive trampolining.

  5. Endoscopic treatment of calcaneo-fibular impingement.

    Science.gov (United States)

    Bauer, T; Deranlot, J; Hardy, Ph

    2011-01-01

    The calcaneo-fibular impingement syndrome is frequent after calcaneal fracture and is linked to the decreased space between the tip of the fibula and the lateral wall of the calcaneus. The reasons for the painful symptoms are mixed with both bony and soft tissue involvement. The abnormal bony contact between the lateral calcaneal cortex and the tip of the fibula depends mainly on the size and localization of the lateral exostosis of the calcaneal wall. The soft tissue impingement is due to the fibrosis and scar tissues in the lateral gutter and to the compression of the peroneal tendons in the retromalleolar groove and under the tip of the malleolus. A 2-portal endoscopic technique is described for the treatment of calcaneo-fibular impingement with bone resection, soft tissue debridement and peroneal tendons release. One of the advantages of this endoscopic technique is the possibility of an assessment and treatment of associated lesions in the same procedure. A subtalar joint fusion can be done before if needed under arthroscopic control. As this endoscopic technique is very efficient to relieve symptoms of calcaneo-fibular impingement and is focused on the most relevant symptoms, it can thus be indicated for most of cases of calcaneal malunions, whatever the type of malunion and depending of the painful symptoms.

  6. Results of the surgical treatment of calcaneo-navicular coalito.

    Science.gov (United States)

    Jerosch, J; Lindner, N; Finnen, D A

    1997-01-01

    We present the results after surgical treatment in 15 patients who suffered from calcaneo-navicular coalitio. A total of 20 operations were performed on 19 feet (3 T-arthrodesis, 5 simple resections, 9 resections with fat interposition, 3 resections with muscle interposition). At the time of follow-up, the patients were examined clinically and radiologically. In addition, different functional tests were performed (heel-tip test, balance test, single-leg high jump, single-leg jumping course). Ten of 17 patients who underwent radiographic study at the follow-up had a successful result. Patients who had a coalitio showed a tibial rotation (heel-tip test) of 11.5 degrees, and those patients without a coalitio had a tibia rotation of 20.3 degrees. Concerning the functional outcome, 12 of 17 patients had a successful result. The range of motion of the subtalar joint did not correlate with the functional capacity of the ankle. Seven of 20 patients subjectively judged the outcome as a failure. The worst results were found in patients with pre-existing degenerative changes at the time of resection.

  7. [Variations in the calcaneo-fibular ligament (lig. calcaneofibulare). Application to the kinematics of the ankle].

    Science.gov (United States)

    Trouilloud, P; Dia, A; Grammont, P; Gelle, M C; Autissier, J M

    1988-03-01

    The authors observe variations in the calcaneo-fibular ligament because this ligament controls two articulations, the talo-crural and the subtalar. This study is based on the dissection of the ankle of 20 specimens. The calcaneo-fibular ligament is reinforced by the ventral and lateral talo-calcaneus ligaments with variations. 3 types of disposition have been described. Type A: A lateral talo-calcaneal ligament reinforces the calcaneo-fibular ligament. These two ligaments are divergent on the proximal, medial, or distal part. Type B: There is an independent lateral talo-calcaneal ligament forward of the calcaneo-fibular ligament. Type C: A ventral talo-calcaneal ligament is observed, parallel to the interosseous ligament. The authors consider the consequences of variation in the lateral ligaments of the ankle for the functioning of the tibio-tarsal articulation, the subtalar articulation and the astragalo-scaphoid articulation in order to propose specific radiographic examination of the kinematics of the ankle.

  8. Calcaneo-stop procedure in the treatment of the juvenile symptomatic flatfoot.

    Science.gov (United States)

    Pavone, Vito; Costarella, Luciano; Testa, Gianluca; Conte, Giorgio; Riccioli, Maria; Sessa, Giuseppe

    2013-01-01

    Flexible flatfoot is the most prevalent condition seen in pediatric orthopedic clinics. It is characterized by an absence of the medial arch and a valgus position of the calcaneus. The purpose of the present study was to report on the results obtained in children treated using the calcaneo-stop procedure. A total of 410 flatfeet in 242 consecutive patients were treated using the calcaneo-stop procedure from January 1999 to March 2010 (10 years, 3 months) and were followed up to February 2012. The mean age at surgery was 11 (range 7 to 14) years, and the mean follow-up duration was 88 (range 14 to 157) months. A clinical evaluation, podoscopic examination, and radiologic assessment were performed in the participating patients preoperatively and at 6 months postoperatively. Of the 242 patients, 168 (69.42%) underwent bilateral foot surgery and 74 (30.58%) unilateral intervention, involving 33 right (44.6%) and 41 left (55.4%) feet. At follow-up, the outcome was satisfactory in 397 feet (96.83%); heel valgus was observed in only 12 feet (2.92%), and the footprint was normalized in 328 feet (80%). The calcaneo-stop procedure is a simple, reliable, and minimally invasive procedure for the treatment of pediatric flexible flatfoot. It allows alignment of the talus and calcaneus, restoring a proper foot arch.

  9. Tibio-calcaneo-naviculo-cuboidale arthrodesis: 6 patients followed for 1-8 years.

    Science.gov (United States)

    Weber, Michael; Schwer, Helmut; Zilkens, Karl W; Siebert, Christian H

    2002-01-01

    As a salvage procedure for patients with irreparable damage to the peritalar anatomy, we used a new method, the Ilizarov ring fixator, to stabilize a tibio-calcaneo-naviculo-cuboideal (TCNC) arthrodesis after resecting the talus in 6 patients with an average follow-up of 3 years. The tibia was lengthened by callus distraction, mean 6 (3.5-10) cm. Patients with exacerbation of a chronic talar osteomyelitis, symptomatic posttraumatic changes, and those with extremely unstable club feet and talar deformity preventing an adequate reduction of the joint, were successfully treated with the TCNC-fusion. The method permits early weight bearing, while providing stability and compression of the fusion, thereby avoiding further loss of bone stock.

  10. [Lower limb stump reconstruction with a functional calcaneo-plantar unit free flap. A series of 16 cases].

    Science.gov (United States)

    Malikov, S; Dubert, T; Koupatadze, D; Nabokov, V; Polosov, R

    1999-04-01

    The main objective of surgery, once amputation is inevitable, is to preserve a functional stump. This report describes the immediate reconstruction of 16 leg stumps in children by transfer of a functional calcaneo-plantar unit. Of these, 3 were thigh and 13 were lower leg reconstructions. Amputation was performed for tumor in 4 cases, and was due to accidents in the remaining twelve. The main technical features of flap preparation are preservation of the calcaneum branch and attachment of the heel skin to the greater tuberosity of the calcaneum. One case resulted in failure due to vascular thrombosis. The other 15 cases resulted in bone consolidation after an average of 45 days, sensitive protection by 70 days, and very good trophic and protective results. The provision of good distal pressure area encourages overall development of the child. There was no morbidity at the donor site, and because there is no major muscle mass in the distal fragment, the overall risk is very low compared to that of total proximal leg replantation. The transfer of functional calcaneo-plantar tissue as a single unit is the best strategy for one-step restoration of good distal support area for the stump. All surgeons liable to perform leg amputations should be aware of this technical approach.

  11. Oscillating flux in petroleum emulsions irradiated with laser; Flujo oscilatorio en emulsiones de petroleo irradiadas con laser

    Energy Technology Data Exchange (ETDEWEB)

    Costa, G. Da; Parra, J.E.; Mosqueda, F. [Departamento de Fisica, Laboratorio de Optica y Fluidos, Universidad Simon Bolivar, Apartado Postal 89000, Caracas 1080-A, (Venezuela)]. e-mail: german@usb.ve; Romanelli, A.; Sicardi-Schifino, A. [Instituto de Fisica, Facultad de Ingenieria, Julio Herrera y Reissig 565, Montevideo, (Uruguay)]. e-mail alejo@fing.edu.uy

    2003-07-01

    Oil-in-water emulsions are irradiated with a Cw laser beam. A floating oil layer grows up in the water free surface. Laser-induced wave propagation in the oil layer gives rise to space-time self-modulation of the reflected light beam. A theoretical model explains main features of observed phenomena. (Author)

  12. The Use of Laser Microdissection in Forensic Sexual Assault Casework: Pros and Cons Compared to Standard Methods.

    Science.gov (United States)

    Costa, Sergio; Correia-de-Sá, Paulo; Porto, Maria J; Cainé, Laura

    2017-01-30

    Sexual assault samples are among the most frequently analyzed in a forensic laboratory. These account for almost half of all samples processed routinely, and a large portion of these cases remain unsolved. These samples often pose problems to traditional analytic methods of identification because they consist most frequently of cell mixtures from at least two contributors: the victim (usually female) and the perpetrator (usually male). In this study, we propose the use of current preliminary testing for sperm detection in order to determine the chances of success when faced with samples which can be good candidates to undergo analysis with the laser microdissection technology. Also, we used laser microdissection technology to capture fluorescently stained cells of interest differentiated by gender. Collected materials were then used for DNA genotyping with commercially available amplification kits such as Minifiler, Identifiler Plus, NGM, and Y-Filer. Both the methodology and the quality of the results were evaluated to assess the pros and cons of laser microdissection compared with standard methods. Overall, the combination of fluorescent staining combined with the Minifiler amplification kit provided the best results for autosomal markers, whereas the Y-Filer kit returned the expected results regardless of the used method.

  13. Polipectomías endometriales realizadas con electrodo bipolar Versapoint y Laser Dioso

    OpenAIRE

    Lara Domínguez, María Dolores

    2016-01-01

    Introducción: Los pólipos endometriales son lesiones de incidencia desconocida. Suelen ser asintomáticos, siendo descubiertos como hallazgo casual; en otros casos son responsables de hemorragia uterina anómala o infertilidad. Un mínimo porcentaje malignizan. Pueden surgir en cualquier edad, pero más frecuentemente en la menopausia temprana. Los pólipos pueden ser resecados mediante electrocirugía o laser Diodo a través de un histeroscopio rígido, y son las técnicas evaluadas en...

  14. Comportamiento tribológico del acero AISI W112 con endurecimiento lineal mediante laser de ND:YAG.L. // Tribological behavior of AISI W112 steel with lineal hardening by means of ND:YAG laser.

    Directory of Open Access Journals (Sweden)

    R. Sagaró

    2001-07-01

    Full Text Available Para disminuir el desgaste en los sistemas tribológicos frecuentemente se acostumbra a endurecer localmente aquellaszonas sometidas a desgaste. En el presente trabajo, para incrementar la dureza y la resistencia al desgaste del acero AISIW112 se empleó un láser de Nd:YAG. Las características de fricción y desgaste del acero AISI W112 en condiciones decontacto deslizante en fricción seca con el acero 65MN4 fueron evaluadas para tratamientos convencionales luego de suirradiación con láser. En el trabajo se presentan además las transformaciones que ocurren durante el tratamiento con láser,así como la influencia de los parámetros operacionales del láser en la profundidad de la capa endurecida y lascaracterísticas tribológicas. El trabajo experimental corroboró que la resistencia al desgaste del acero AISI W112 es variasveces superior en comparación con los tratamientos convencionales.Palabras claves: Comportamiento tribológico, endurecimiento lineal, tratamiento superficial con láser._______________________________________________________________________________Abstract.Diminishing wear in tribological systems is usually done by locally hardening those areas subject to wear. In this paper ispresented the increasing of hardness and resistance to wear of AISI W112 steel by means of a Nd:YAG laser. Thecharacteristics of friction and wear of AISI W112 steel under sliding contact in dry friction conditions with the 65MN4steel were evaluated for conventional treatments and after laser irradiation. In the work are presented the transformationsthat take place during the laser treatment, as well as the influence of the laser operational parameters in the depth of thehardened layer and the tribological characteristics. The experimental work corroborated that the resistance to wear of AISIW112 steel is several times superior in comparison with conventional treatments.Key words: Tribological behavior , lineal hardening, laser superficial

  15. Lubricated wear of NiCrBSi coatings partially remelted with laser; Desgaste lubricado de recubrimientos NiCrBSi refundidos parcialmente con laser

    Energy Technology Data Exchange (ETDEWEB)

    Vijande, R.; Cuetos, J. M.; Cortizo, J. L.; Rodriguez, E.; Noriega, A.

    2009-07-01

    Plasma sprayed nickel based coatings are widely used at the industry due to their good wear behaviour. The laser remelting of these coatings eliminates or strongly decreases their porosity and increases their microhardness and adherence with the substrate. In this work, we define the laser meshing as the partial re fusion of the coatings surface. This technique is applied to a NiCrBSi coating in order to achieve better anti-wear outcomes, combining the advantages of plasma spraying and laser remelting. The results are experimentally verificated and they quantify themselves attending to the variables percentage of remelted surface and angle of meshing cord (remelting trace of successive parallel tracks by a laser beam). The experimental process is developed following the DOE methodology, to optimize both the test process and the objective function of minimum wear in lubricated contact. (Author) 18 refs.

  16. Malformaciones venosas orofaciales de bajo flujo: esclerosis endoluminal con láser de diodo Low-flow orofacial venous malformations: endoluminal sclerosis with a diode laser

    Directory of Open Access Journals (Sweden)

    M. Puche Torres

    2010-06-01

    Full Text Available Introducción: Las anomalías vasculares son procesos frecuentes que se localizan en más del 50% de los casos en la región de la cabeza y el cuello. Las técnicas clásicas de tratamiento, tales como la cirugía y la esclerosis química, han dado paso a modernas técnicas menos invasivas, tales como el láser Nd:YAG. Por otra parte, se ha utilizado con éxito el láser de diodo (980 nm para el tratamiento de varices mediante esclerosis endoluminal. Nuestra propuesta es la utilización del láser de diodo (l 980 nm para provocar una esclerosis por fotocoagulación intralesional de las malformaciones venosas de bajo flujo dada la capacidad de este láser de ser transmitido por fibra óptica. Objetivo: Exponer nuestros resultados en el tratamiento de malformaciones venosas de bajo flujo (MVBF orofaciales mediante la terapéutica de esclerosis endoluminal con láser de diodo. Material y métodos: Revisamos 84 pacientes que presentaban MVBF orofaciales tratados con láser de diodo. Describimos la técnica de realización y se muestran los resultados postoperatorios a corto plazo. Resultados: Tras un periodo de seguimiento no inferior a 12 meses se constató curación en el 95,24% aplicando una o dos sesiones y solamente en 4 casos se objetivó recidiva. Concluimos que la técnica de esclerosis endoluminal con láser de diodo de MVBF en el área orofacial se constituye como una nueva técnica de tratamiento, mínimamente invasiva, ambulatoria, y que permite la resolución de los casos sin tener que recurrir a cirugías más agresivas y con excelentes resultados funcionales y estéticos.Background: Vascular anomalies are common processes that involve the head and neck region in more than 50% of the cases. Traditional treatment options such as surgery and chemical sclerosis have given way to modern less-invasive techniques, including Nd:YAG laser treatment. On the other hand, 980 nm laser diode has been successfully used for the endovenous sclerosis

  17. Laser heat treatment of steel cutting blades for agricultural uses; Tratamiento termico con laser de cuchillas de acero para uso agricola

    Energy Technology Data Exchange (ETDEWEB)

    Muniz, G.; Conde, A.; Fernandez, B. J.; Varela, R.; Garcia, I.; Damborenea, J. de

    2003-07-01

    The present paper focuses on the laser surface treatment of mild steels with different %wt of carbon to be used as cutting blades in agricultural applications. The results are discussed in function of the metallographic study, hardness profiles, wear resistance and corrosion testing. Special attention is paid to the results of the results obtained with the experimental steel with carbon 0.33 %wt because it is a new promising materials specifically developed to be applied in such agricultural uses. Metallographic studies showed three well defined regions: the laser treated zone, where solid state phase transformation occurs, the heat affected zone (HAZ) with partial transformations and finally the bulk metal with the original microstructure. Surface hardness was in all cases higher than the base steel in a depth range 600 {mu}m. Wear resistance is notably improved with laser heat treatment while no detrimental effects were induced in their specific corrosion resistance. (Author) 16 refs.

  18. Con_A-CNT (Carbon Nanotube) Conjugate with Short Wave Near-Infrared (SWIR) Laser Ablation for Tumor Therapy

    Science.gov (United States)

    2010-02-11

    originate from hematopoietic stem cells in bone marrow during childhood development for “adaptive immune system” in Thymus organ with a variety of “T...cells,” short for Thymus cells,: so-called helper, cytotoxic, memory, regulator, natural killer (NK), alpha-beta-gamma-delta receptor called T cells...cells [17-19]. We have reported Concanavalin A (Con A), a plant lectin isolated from Canavalia ensiformis (Jack bean) seeds, can agglutinate cells with

  19. Tratamiento del rinofima con láser de CO2: Presentación de un caso Treatment of rhinophyma with CO2 laser: A case report

    Directory of Open Access Journals (Sweden)

    J.L. Cebrián Carretero

    2006-04-01

    Full Text Available Introducción. El rinofima es una alteración cutánea de la región nasal que produce problemas estéticos importantes. Describimos nuestra experiencia en un caso de rinofima avanzado y su resolución por medio de una técnica sencilla. Material y métodos. Previa desinfección cutánea se realizó anestesia infiltrativa y bloqueo troncular de nervios infraorbitarios y etmoidales. A continuación se realizó la resección de casi todo el espesor cutáneo con un láser de CO2 Lumenis Sharplan conservando la dermis profunda para permitir la curación por segunda intención. Posteriormente se aplicó vaselina y se realizaron curas y lavados diarios. El paciente fue dado de alta al día siguiente de la intervención. Resultados. Los resultados estéticos fueron muy buenos. El dolor postoperatorio fue controlado con analgesia habitual. En la primera semana se objetivaba un buen grado de cicatrización. A los 2 meses la reepitelización fue completa y ya no se observaban costras ni eritema. Conclusión. La utilización del láser de CO2 en el tratamiento del rinofima avanzado logra unos excelentes resultados estéticos con una morbilidad y riesgo operatorio mínimos.Introduction. Rhinophyma is a skin alteration of the nasal region that causes considerable aesthetic problems. We describe our experience with a case of advanced rhinophyma and its resolution by means of a simple technique. Materials and methods. The skin area was disinfected beforehand, anaesthesia infiltration and the infraorbital and ethmoidal nerve trunks were blocked. Then, using a Lumenis Sharplan CO2 laser almost the complete skin thickness was resected while preserving the deep dermis layer so as to allow second intention healing. Later, Vaseline was applied and the area was treated daily. The patient was discharged the day after the intervention. Results. The aesthetic results were very good. Postoperative pain was controlled with standard analgesics. Adequate healing was

  20. Lasers.

    Science.gov (United States)

    Passeron, T

    2012-12-01

    Lasers are a very effective approach for treating many hyperpigmented lesions. They are the gold standard treatment for actinic lentigos and dermal hypermelanocytosis, such as Ota nevus. Becker nevus, hyperpigmented mosaicisms, and lentigines can also be successfully treated with lasers, but they could be less effective and relapses can be observed. However, lasers cannot be proposed for all types of hyperpigmentation. Thus, freckles and café-au-lait macules should not be treated as the relapses are nearly constant. Due to its complex pathophysiology, melasma has a special place in hyperpigmented dermatoses. Q-switched lasers (using standard parameters or low fluency) should not be used because of consistent relapses and the high risk of post-inflammatory hyperpigmentation. Paradoxically, targeting the vascular component of the melasma lesion with lasers could have a beneficial effect. However, these results have yet to be confirmed. In all cases, a precise diagnosis of the type of hyperpigmentation is mandatory before any laser treatment, and the limits and the potential side effects of the treatment must be clearly explained to patients.

  1. [Lasers].

    Science.gov (United States)

    Passeron, T

    2012-11-01

    Lasers are a very effective approach for treating many hyperpigmented lesions. They are the gold standard treatment for actinic lentigos and dermal hypermelanocytosis, such as Ota nevus. Becker nevus, hyperpigmented mosaicisms, and lentigines can also be successfully treated with lasers, but they could be less effective and relapses can be observed. However, lasers cannot be proposed for all types of hyperpigmentation. Thus, freckles and café-au-lait macules should not be treated as the relapses are nearly constant. Due to its complex pathophysiology, melasma has a special place in hyperpigmented dermatoses. Q-switched lasers (using standard parameters or low fluency) should not be used because of consistent relapses and the high risk of post-inflammatory hyperpigmentation. Paradoxically, targeting the vascular component of the melasma lesion with lasers could have a beneficial effect. However, these results have yet to be confirmed. In all cases, a precise diagnosis of the type of hyperpigmentation is mandatory before any laser treatment, and the limits and the potential side effects of the treatment must be clearly explained to patients.

  2. Interstitial laser photocoagulation in the treatment of liver tumors. Personal technique, short term results and complications in patients with normal and impaired liver function; Fotocoagulazione laser-interstiziale ecoguidata dei tumori maligni del fegato: tecnica personale, risultati immediati e complicanze a breve termine nei pazienti con funzionalita' epatica normale e alterata

    Energy Technology Data Exchange (ETDEWEB)

    Giorgio, A.; Tarantino, L.; De Stefano, G.; Farella, N. [Azienda Ospedaliera D. Cotugno, Naples (Italy). Servizio di Ecografia ed Ecointerventistica; Catalano, O.; Cusati, B. [Ospedale S. Maria delle Grazie, Pozzuoli, NA (Italy). Servizio di Radiologia; Alalia, A. [Azienda Ospedaliera D. Cotugno, Naples (Italy). Servizio di Anestesia e Rianimazione; Del Vescovo, L. [Naples Univ. II, Naples (Italy). Ist. di Radiologia

    2000-04-01

    The work reports the personal experience with interstitial laser photocoagulation in patients with liver tumors (mostly cirrhotics with hepatocellular carcinoma). The aim was to evaluate the short term efficacy of percutaneous interstitial laser photocoagulation in inducing focal ablation of liver tumors and the possible complications in patients with normal and impaired liver function. [Italian] Il presente lavoro riporta l'esperienza personale con l'utilizzazione della fotocoagulazione laser-interstiziale per tumori maligni del fegato, rappresentati in gran parte da epatocarcinomi in cirrosi. Lo scopo e' quello di verificare l'efficacia terapeutica in termini di volume di necrosi e di valutare gli effetti collaterali e le complicanze a breve termine sulla riserva funzionale del fegato e di altri organi, soprattutto nei pazienti con alterata funzionalita' epatica.

  3. Escisión de un fibroma de células gigantes con láser de diodo: Informe de un caso Excision of a giant cell fibroma with Diodo's Laser: Report of case

    Directory of Open Access Journals (Sweden)

    C.M. Ardila Medina

    2010-06-01

    Full Text Available Este artículo informa un caso de un fibroma gigantocelular localizado en tejido gingival y mucosa oral. Microscópicamente, la lesión se caracterizó por proliferación de fibras colágenas y fibroblastos gigantes, que se disponían en forma densa e irregular. Además, la superficie de la lesión estaba revestida por epitelio con cambios de hiperqueratosis. Se realizó escisión del fibroma con láser de diodo.This article reports a case of giant cell fibroma located in the gingival tissue and oral mucosa. Microscopically, the lesion was characterized by proliferation of collagen fibers and giant fibroblast, irregular and densely arranged. Beside, the surface was covered by epithelium with hiperqueratosis changes. The excision was done with Diodo's Laser.

  4. Correlation between macro texture measures carried out by the volumetric method and by different laser texture meter; Correlacion de medidas de macrotextura tomadas con el metodo volumetrico y con diferentes texturometros lasar

    Energy Technology Data Exchange (ETDEWEB)

    Parra Ruiz, L.; Yanguas Gonzalez, S. J.

    2013-06-01

    The reference value for the measurement of surface macro texture in the Spanish Main Road Network is the MTD or Mean Texture Depth (PMT, Profundidad Media de Textura), obtained by means of the volumetric methods, in accordance with the standard UNE EN 13036-1:12010. The fact that it is a spot measurement that requires road closures makes it an expensive procedure as well as slow and dangerous. In addition to this, the test results are relatively sensitive to the operator, being the procedure not too suitable for systematic surveys. These are some of the reasons that have contributed to the development of texture meter laser devices that can be assembled on board of vehicles, circulating without interfering with the normal traffic flow and providing a parameter named the MPD (Mean Depth Profile). According to the standard UNE-EN ISO 13473-1:2006, it is possible to estimate the texture obtained by volumetric methods, with the parameter ETD (Estimated Texture Depth) through the equation: ETD=0,8 x MPD+0.2 In 2008 CEDEX conducted a study that correlated macro texture measures obtained by means of the volumetric method with such carried out by different laser texture meters. The equations yield a better relation between MPD and MTD were dependent on the measurement device used and were not linear equations type, as is it indicated in the standard, but exponential type equations. (Author) 6 refs.

  5. Central uplift of custom immobilization radiotherapy patients with lower limb overhead sagittal laser affected without mobile; Elevacion central de inmovilizacion personalizada de pacientes radioterapicos con extremidades inferiores afectas sin laser sagital cenital movil

    Energy Technology Data Exchange (ETDEWEB)

    Velazquez Miranda, S.; Delgado Gil, M. M.; Ortiz Seidel, M.

    2011-07-01

    If you have a laser moving overhead sagittal or the location of tumors in the lower extremities is laborious, as to reference properly in the CT, is necessary before tattooing in the treatment table using their ability to relate the lateral midline with tattoos on the limb. For anatomical forms often happens that lasers are not displayed on the areas of our interest. The problem can be overcome if between the legs raise the bag or custom immobilizer above the height of the patient's abdomen, as this will have a central reference reliable and well designed lasers.

  6. Optical fibres sensor based in the intensity switch of a linear laser with two Bragg gratings; Sensor de fibra optica basado en el salto de intensidad de un laser lineal con dos rejillas de Bragg

    Energy Technology Data Exchange (ETDEWEB)

    Basurto P, M.A.; Kuzin, E.A.; Archundia B, C.; Marroquin, E.; May A, M.; Cerecedo N, H.H.; Sanchez M, J.J. [Departamento de Fotonica y Fisica Optica, Instituto Nacional de Astrofisica, Optica y Electronica (INAOE). Apartado Postal 51 y 216, 72000 Puebla (Mexico); Tentori S, D.; Marquez B, I.; Shliagin, M.; Miridonov, S. [Centro de Investigacion CESE (Mexico)

    2000-07-01

    In this work we propose a new configuration for an optical fiber temperature sensor, based on a linear type Er-doped fiber laser. The laser cavity consists of an Er-doped fiber and two identical Bragg gratings at the fiber ends (working as reflectors). Temperature changes are detected by measuring, through one of the gratings, the intensity variations atthe system's output. When the temperature of one of the Bragg gratings is modified, a wavelength shift of its spectral reflectivity is observed. Hence, the laser emission intensity of the system is modified. We present experimental results of the intensity switch observed when the temperature difference between the gratings detunes their spectral reflectance. Making use of this effect it is possible to develop limit comparators to bound the temperature range for the object under supervision. This limiting work can be performed with a high sensitivity using a very simple interrogation procedure. (Author)

  7. Steel phase transformants in the CO{sub 2} laser hardening process; Modelizacion de las transformaciones de fase en el proceso de endurecimiento de aceros con laser de CO{sub 2}

    Energy Technology Data Exchange (ETDEWEB)

    Amado, J. M.; Alvarez, C.; Nicolas, G.; Lopez, A. J.; Perez, J. A.; Ramil, A.; Saavedra, E.; Sanesteban, J.; Tobar, M. J.; Yanez, A.

    2004-07-01

    Hardening processes of steel are very dependent on the heating and cooling rates, in both cases high rates are needed. In the laser hardening the power density of the laser beam is responsible of the fast heating of the material; fast cooling is achieved due to the heat conduction from the region being treated to the bulk of the work piece. Within this work thermal cycles are determined with a Finite Element Model which computes the temperature of the material during the laser treatment. For the prediction of the hardening IT diagrams are applied, isothermal steps are connected with constant volume fraction steps; the content of each is computed in the framework of the Johnson-Mehl and Avrami law. During the cooling process, a similar procedure is applied but now using TTT diagrams. Model validation is done comparing, on a local basis, microhardness measurement on a treated work piece with the martensite concentration extracted from the model. (Author) 6 refs.

  8. Modification of AISI M2 high speed tool steels after laser surface melting under different operation conditions; Modificacion de los aceros rapidos de herramientas AISI M2 por fusion superficial con laser bajo diferentes condiciones de operacion

    Energy Technology Data Exchange (ETDEWEB)

    Arias, J.; Cabeza, M.; Castro, G.; Feijoo, I.; Merino, P.; Pena, G.

    2010-07-01

    We applied a laser surface melting treatment to AISIM2 high-speed steel hardened and tempered- and studied the resulting surface characteristics (microstructure) and mechanical behavior (hardness and wear performance). The steel was treated using a Nd:YAG continuous-wave laser with different operation conditions. The influence of the laser processing parameters on the single tracks and on melted surface layer obtained by multipass system with 50% overlap were studied. The microstructure for all conditions is formed by MC- and M{sub 2}C-type carbides, martensite and retained austenite; the quantities of this phase depends on the operations conditions. It has been determined that low levels of power density and high speed scanning of the beam leads to greater homogeneity in the microstructure with high hardness values and wear resistance. (Author) 26 refs.

  9. Spatial resolution in laser ablation inductively coupled plasma mass spectrometry; Resolucion espacial en la ablacion laser acoplada a la espectrometria de masas con fuente de plasm de acoplamiento inductivo

    Energy Technology Data Exchange (ETDEWEB)

    Coedo, A. G.; Dorado, M. T.

    2010-07-01

    Laser ablation as sampling system in inductively coupled plasma mass spectrometry (LA-ICP-MS) offers the possibility to know the spatial distribution of elements present in a solid sample. By varying the position of the laser beam on the sample surface, the profile of the lateral distribution of elements is obtained and, with successive pulses fired on a fixed point, profile in depth is achieved. After optimization of operating parameters the technique has been applied to samples with different compositions in both surface and depth.With regard to the lateral resolution has been found that in a length similar to the crater diameter of the laser beam, the signals of the elements appear mixed, making difficult to accurately establish the interface. Regarding the resolution in depth is clearly established the influence of the natural abundance of the measured isotopes. (Author)

  10. Relativistic dynamics of an electron in a pulse of laser light with propagation along of an external magnetic field; Dinamica relativista de un electron en un pulso de luz laser con propagacion a lo largo de un campo magnetico externo

    Energy Technology Data Exchange (ETDEWEB)

    Gomez, F. [UAEM, Facultad de Ciencias, 50000 Toluca, Estado de Mexico (Mexico); Ondarza, R. [ININ, 52045 Ocoyoacac, Estado de Mexico (Mexico)

    2003-07-01

    The exact solution for the movement of a charged particle in the interaction of an electromagnetic pulse elliptically polarized spreading along a static and homogeneous magnetic field is obtained starting from the equation of force. The solution method allows to solve, in terms of the phase, the trajectory of an accelerated particle by a pulse of arbitrary width and modulated by an encircling in Gaussian form. The reported solutions in this work have diverse applications in the laser-plasma interaction physics. (Author)

  11. Diatomic gasdynamic lasers.

    Science.gov (United States)

    Mckenzie, R. L.

    1972-01-01

    Predictions from a numerical model of the vibrational relaxation of anharmonic diatomic oscillators in supersonic expansions are used to show the extent to which the small anharmonicity of gases like CO can cause significant overpopulations of upper vibrational states. When mixtures of CO and N2 are considered, radiative gain on many of the vibration-rotation transitions of CO is predicted. Experiments are described that qualitatively verify the predictions by demonstrating laser oscillation in CO-N2 expansions. The resulting CO-N2 gasdynamic laser displays performance characteristics that equal or exceed those of similar CO2 lasers.

  12. Relativistic motion of charged particles in the interaction of short pulses of intense laser light with plasma; Movimiento relativista de particulas cargadas en la interaccion de pulsos cortos de luz laser intensa con plasma

    Energy Technology Data Exchange (ETDEWEB)

    Gomez R, F

    2004-07-01

    interval d{tau} of the electron that per se is an invariant, it is proportional to a certain interval d{eta}. In the chapter 3 it will see that the movement analysis of the charged particles in the electromagnetic field presents serious mathematical difficulties, where the integration of the movement equations results extraordinarily complex and it can only be integrated in most of the cases by numerical means. We will present the procedure used for the deduction of the equations of motion of a charged particle in the interaction of a laser light pulse and a homogeneous magnetic field in arbitrary direction, with the addition of an harmonic term of force. In this chapter it is not sought to make a meticulous discussion of the involved physics and only we will present the algebraic procedure. In the chapter 4 we will present the integration method of the Lorentz force, and we will obtain the exact solution for the case of a pulse of a plane wave elliptically polarized of arbitrary amplitude spreading along an external magnetic field. The solution method will allow to decrease the solutions to the case in which we have an infinite waves train reported by Ondarza (10) and so the corresponding solutions will be obtained reported in the literature by other authors. The main contribution in this part will be the one of obtaining an exact solution for the problem of the interaction of an electromagnetic pulse, modulated by a form of gaussian type, and a charged particle. The above-mentioned approaches in acceptable measure to real situations in well-known experiments. It will be found that when the form of the pulse is introduced to modulate the electromagnetic field, an amplification of the resonance zone in the solutions appears. Such resonance depends of the external magnetic field that fixes by turns the cyclotron frequency, and of the number of optical cycles that compose the encircling one that modulates the pulse form. In the chapter 5 it will see the case of small

  13. Relativistic motion of charged particles in the interaction of short pulses of intense laser light with plasma; Movimiento relativista de particulas cargadas en la interaccion de pulsos cortos de luz laser intensa con plasma

    Energy Technology Data Exchange (ETDEWEB)

    Gomez R, F

    2004-07-01

    interval d{tau} of the electron that per se is an invariant, it is proportional to a certain interval d{eta}. In the chapter 3 it will see that the movement analysis of the charged particles in the electromagnetic field presents serious mathematical difficulties, where the integration of the movement equations results extraordinarily complex and it can only be integrated in most of the cases by numerical means. We will present the procedure used for the deduction of the equations of motion of a charged particle in the interaction of a laser light pulse and a homogeneous magnetic field in arbitrary direction, with the addition of an harmonic term of force. In this chapter it is not sought to make a meticulous discussion of the involved physics and only we will present the algebraic procedure. In the chapter 4 we will present the integration method of the Lorentz force, and we will obtain the exact solution for the case of a pulse of a plane wave elliptically polarized of arbitrary amplitude spreading along an external magnetic field. The solution method will allow to decrease the solutions to the case in which we have an infinite waves train reported by Ondarza (10) and so the corresponding solutions will be obtained reported in the literature by other authors. The main contribution in this part will be the one of obtaining an exact solution for the problem of the interaction of an electromagnetic pulse, modulated by a form of gaussian type, and a charged particle. The above-mentioned approaches in acceptable measure to real situations in well-known experiments. It will be found that when the form of the pulse is introduced to modulate the electromagnetic field, an amplification of the resonance zone in the solutions appears. Such resonance depends of the external magnetic field that fixes by turns the cyclotron frequency, and of the number of optical cycles that compose the encircling one that modulates the pulse form. In the chapter 5 it will see the case of small

  14. Arteterapia con personas con discapacidad intelectual

    OpenAIRE

    Lorenzo Pipkau, Milena

    2015-01-01

    Este proyecto pretende hacer una aproximaci??n al mundo del Arte Terapia y los beneficios que esta disciplina puede aportar a las personas con discapacidad intelectual. La idea surge de la experiencia previa de la autora en este ??mbito y con este colectivo. A trav??s de la documentaci??n bibliogr??fica se busca ampliar el conocimiento en cuanto al concepto de arteterapia y sus antecedentes, con la finalidad de elaborar una propuesta pr??ctica que se basar?? en el dise??o de un taller de arte...

  15. Laser Therapy

    Science.gov (United States)

    ... How to Choose the Best Skin Care Products Laser Resurfacing Uses for Laser Resurfacing Learn more about specific conditions where laser ... skin Scars Sun-damaged skin Wrinkles What is laser resurfacing? Laser resurfacing is a procedure that uses ...

  16. Anharmonic Oscillator Lasers.

    Science.gov (United States)

    laser development ; time dependent solutions of the master kinetic equations; electric discharge stabilization in a supersonic CO/N2 flow; and computations of vibrational pumping rates by electrons including super-elastic collisions. A description of the progress made in each of these areas is

  17. Educar con significado o con sentido

    Directory of Open Access Journals (Sweden)

    José Joaquín García García

    2017-01-01

    Full Text Available Hoy día, tres tendencias influyen directamente en la conformación de la escuela. En primer lugar, el afán de encontrar la esencia de todo encumbró a la razón e hizo de la racionalidad el único valor a defender en las aulas. En segundo lugar, el sistema capitalista hizo lo mismo con aquello que tiene valor de uso y valor de cambio, es decir, con la mercancía, validando solo lo que puede tener una utilidad económica conocida o posible. Esto convirtió a la educación en un proceso para certificar y ganar dinero, desdibujando así su intención de formar personas. Finalmente, la visión masculina y eurocéntrica con su locura por quererlo dominar todo, y de pensar que el hombre era el dueño del planeta e inclusive la vida y el destino de los otros hombres, mutiló culturas y eliminó a la naturaleza de los currículums en los centros educativos.

  18. Investigando con personas con dificultades de aprendizaje

    Directory of Open Access Journals (Sweden)

    Borja González Luna

    2013-12-01

    Full Text Available El artículo muestra los orígenes de lo que Walmsley (2008 denomina «investigación inclusiva». Para comprender qué se entiende por investigación inclusiva tenemos que remontarnos a los debates epistemológicos sobre las metodologías cuantitativas y cualitativas, acontecidos en la década de los 90, en torno a la revista Disability & Society. A partir de una síntesis de dichos debates, focalizados en el ámbito de la «discapacidad intelectual y del desarrollo», se exponen dos estrategias de colaboración con dicha población: a una aproximación etnográfica (de trabajo grupal, y b una aproximación biográfica (de trabajo individual. A continuación se esboza un posible diseño de trabajo de campo que intenta superar el paradigma cualitativo «clásico» con el objetivo de incluir a dicho colectivo más allá del rol de «sujetos de la investigación». Para finalizar se recoge el debate sobre la accesibilidad de los resultados de la investigación a los participantes en dichas investigaciones, y con ello la necesaria innovación en el ámbito de las «devoluciones» de los resultados, cuando se trata de incluir a personas que presentan limitaciones para la comprensión del lenguaje abstracto oral y/o escrito.

  19. Liposucción con diodo láser 980-nm (LSDL 980-nm: optimización de protocolo seguro en cirugía de contorno corporal Body contouring using laser diode 980-nm (LSDL 980-nm assisted lipolysis: a safe procedure

    Directory of Open Access Journals (Sweden)

    P. Centurión

    2011-12-01

    Full Text Available La disponibilidad en el mercado de una gran gama de equipos de láser de diferentes potencias y longitudes de onda para su aplicación en el tejido graso, así como la existencia de diversos trabajos científicos sobre el tema con resultados opuestos, han causado gran confusión y dudas sobre la técnica de láser-lipolisis entre los cirujanos plásticos. Presentamos un protocolo quirúrgico de liposucción con diodo-láser de 980-nm (LSDL 980-nm aplicado en 240 pacientes. Evaluamos la seguridad de la técnica según el índice de complicaciones sufrido, así como la evolución en el post-operatorio de los pacientes tratados. Empleamos un equipo diodo-láser-980 nm (ORlight ®, cuya energía llevamos a través de una fibra de 600 μm. Esto se traduce en la aplicación de 99 J por cada cm² de área tratada, con un espesor de hasta 4 cm de tejido adiposo subcutáneo. No tuvimos complicaciones mayores, tipo quemaduras y entre las complicaciones menores, que fueron de un 48.33 % (116 pacientes, encontramos equímosis mínimas (menos del 2 % de superficie corporal. El tiempo que los pacientes requirieron para controlar el dolor postoperatorio fue de entre 1 y 2 días. Consideramos importante la incorporación de la LSDL-980 nm por ser una técnica menos traumática y con bajo índice de complicaciones, que reduce el periodo de recuperación de los pacientes, provoca una importante retracción de la piel y disminuye el dolor postoperatorio.The availability of multiple laser systems on the market with different power and wavelengths and the existence of several scientific papers with contradictory presents, have created great confusion and doubts among plastic surgeons with regard to the laser lipolysis technique. We report a surgical protocol for liposuction diode laser-980 nm (LSDL-980 nm applied to 240 patients. We evaluate the security of the technique according to the complication rate and the postoperative development of patients submitted to

  20. Modelación del perfil de soldadura y de la cavidad de vapor en la aleación de aluminio 5182 soldada con láser. // Welding profile and steam cavity modelation in aluminum 5182 alloy welded with laser.

    Directory of Open Access Journals (Sweden)

    M. Pastor

    2002-09-01

    Full Text Available El presente trabajo incursiona en el desarrollo de modelos para predecir la forma de la cavidad de vapor y el perfil de laaleación de aluminio 5182 con soldadura láser, para lo cual ha sido empleado el paquete profesional de elementos finitosCOSMOS/M. La modelación de la soldadura ha sido realizada considerando como variable el grado de desenfoque del hazde láser, considerando el flujo de calor según un modelo Gaussiano, con un coeficiente de absorción de 0.24 para lacondición de haz enfocado y 0.16 para las condiciones de desenfoque negativo y positivo. La validez de los resultadosobtenidos se comprobó mediante los resultados obtenidos en pruebas experimentales.Palabras claves: Aleaciones de aluminio, láser de Nd:YAG._______________________________________________________________________AbstractThe purpose of this research is the study of laser welding process for the 5182 aluminum alloys and the development ofmodels by means of the COSMOS/M package, in order to predict the shape of the steam cavity and the weldingtemperatures profile. Modeling has been done considering the degree of defocusing. The heat flow applied on the modelswas a Gauss flow, with a coefficient of absorption of 0.24 for the condition of the focused face and 0.16 for the conditionsof negative and positive defocusing. The validity of the models has been demonstrated comparing their results with thoseobtained by experimental tests.Key words: Aluminum alloys, Nd: YAG laser.

  1. Soledad con espectador

    OpenAIRE

    2011-01-01

    Este proyecto se plantea como una investigación de las posibilidades del dibujo como una herramienta para relatar una historia propia que se empapa de realidad y de ficción con el deseo de confundir al espectador y suscitarle preguntas. Para ello me he servido de mi propia imagen como personaje central. Éste se presenta duplicado, multiplicado, repetido e interactúa consigo mismo en un espacio imaginario con intención de simular aquello que se revela en el interior de la psique. Mi trabajo se...

  2. Giochiamo con i robot

    Directory of Open Access Journals (Sweden)

    Andrea Bonarini

    2009-01-01

    Full Text Available "Giochiamo con i robot" e' un laboratorio interattivo per grandi e piccini realizzato per l'edizione 2007 del Festival della Scienza di Genova. Lungo un percorso che va dalla telerobotica alla robotica evolutiva, il laboratorio sviluppa il tema di dare intelligenza ai robot. Questo percorso, le cui tappe sono le varie installazioni, si conclude nella "bottega" dove e' possibile costruire e programmare i propri robot o smontare e modificare quelli esposti durante il percorso didattico. I visitatori sono coinvolti in attivita' ludiche grazie alle quali possonoentrare in contatto con alcune delle idee potenti della robotica,

  3. en pacientes con obesidad

    Directory of Open Access Journals (Sweden)

    Alcia María Alvarado Sánchez

    2005-01-01

    Full Text Available El objetivo de este estudio fue evaluar la eficacia de una intervención psicológica en pacientes con obesidad. Se utilizó un diseño cuasiexperimental con un grupo de estudio y un grupo control. Después de la intervención, se encontró una diferencia significativa en la reducción de peso entre los grupos. Asimismo, hubo un incremento significativo en la autoestima del grupo estudiado.

  4. Funcionando con la computadora

    OpenAIRE

    Álvarez, Eduardo; Astiz, Mercedes; Medina, Perla; Montero, Y.; Oliver, María; Rocerau, M. Cristina; VALDEZ, Guillermo; Vecino, María; Vilanova, Silvia

    2004-01-01

    En este trabajo se presenta la descripción y resultados de la segunda etapa de una experiencia planteada con el objetivo de indagar la manera en que los alumnos determinan e interpretan funciones que explican situaciones problemáticas valiéndose de una nueva forma de trabajo en el aula: la utilización de la computadora como herramienta y un programa asistente matemático. La primera etapa consistió en el desarrollo de un taller optativo con alumnos de entre 14 y 15 años de edad del Colegio Dr....

  5. fertilizada con diferentes abonos

    Directory of Open Access Journals (Sweden)

    Jorge Alberto Elizondo-Salazar

    2007-01-01

    Full Text Available Producción y calidad de la biomasa de morera (Morus alba fertilizada con diferentes abonos. Se llevó a cabo un experimento en la Estación Experimental “Alfredo Volio Mata” de la Universidad de Costa Rica con el fi n de evaluar la aplicación de 150 kg de N/ha/año proveniente de dos abonos orgánicos: lombriabono y compostaje; y de un fertilizante químico, sobre la producción y calidad de la biomasa de morera. El periodo experimental comprendió un ciclo de 12 meses, iniciando en julio del 2003 y fi nalizando en julio del 2004. Se utilizó una plantación de morera de 12 años de establecida con una densidad de siembra de 27.777 plantas/ ha. Se empleó un diseño de bloques completos al azar con cuatro tratamientos: dos abonos orgánicos, nitrato de amonio (33,5% N y un control. Las plantas se podaron a 0,6 m sobre el nivel del suelo al inicio del ensayo. Durante el periodo experimental, las plantas fueron podadas consecutivamente cada 90 días. Las hojas y los tallos fueron separados y analizados para determinar el contenido de materia seca y proteína cruda. La producción de materia seca fue 23% superior y el contenido de proteína cruda fue signifi cativamente mayor con el nitrógeno químico, mientras que el contenido de materia seca fue menor. No se encontraron diferencias signifi cativas entre el tratamiento control y los tratamientos orgánicos.

  6. Influencia del Acabado Superficial en el Digitalizado con Sensores de Triangulación por Láser Influence of Surface Finishing on the Scanning with Laser Triangulation Sensors

    Directory of Open Access Journals (Sweden)

    Eduardo Cuesta

    2008-01-01

    Full Text Available El presente trabajo trata sobre la medida de la influencia que los distintos acabados superficiales tienen sobre la precisión y calidad del digitalizado utilizando sensores láser de triangulación. Entre el gran número de parámetros que influyen en la calidad del digitalizado, se analiza la influencia de la rugosidad. Para ello se ha establecido un procedimiento que permite restringir la influencia de otras variables y que, al mismo tiempo, proporciona una excelente repetibilidad y reproducibilidad. Este procedimiento se ha aplicado a distintos procesos de fabricación que dan lugar a muy distintos acabados superficiales. De esta forma se han establecido ciertas correlaciones cuantificando, además de la influencia de la rugosidad en la nube de puntos, la forma espacial que adopta su dispersión y la intensidad optima para cada proceso.The present work deals with the measurement of the influence that surface finishing has on the accuracy and quality of the scanning performed using laser triangulation sensors. Amongst the great number of parameters that influence the scanning quality, the effect of roughness is analysed. To achieve this, a procedure for constraining the variables while providing an excellent repeatability and reproducibility was proposed. This procedure has been applied to several manufacturing processes that produce parts with very different quality of surface finishing. As a result, certain correlations have been extracted that quantify the influence of the roughness on the quality of the cloud-point, the spatial distribution of the cloud-point dispersion and the optimal laser intensity for each manufacturing process.

  7. Lasers technology

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2011-07-01

    The Lasers Technology Program of IPEN is committed to the development of new lasers based on the research of optical materials and new technologies, as well to laser applications in several areas: Nuclear, Medicine, Dentistry, Industry, Environment and Advanced Research. The Program is basically divided into two main areas: Material and Laser Development and Laser Applications.

  8. Electrodeless excimer laser; Laser a eccimeri senza elettrodi

    Energy Technology Data Exchange (ETDEWEB)

    Lisi, N. [ENEA, Divisione Nuovi Materiali, Centro Ricerche Casaccia, Rome (Italy)

    2001-07-01

    In this paper it is proposed how to build an excimer laser based on an electrodeless discharge (or Dielectric Barrier Discharge). Such laser could operate with a low energy per pulse (<100 mJ) and a high repetition rate (<100 kHz). The most relevant advantage an electrodeless DBD laser is the much longer gas mixture lifetime. This feature could allow the operation of a sealed laser emitting higher average power with respect to commercially available excimer lasers. Such discharge scheme could be advantageous in order to excite the F{sub 2} excimer molecule, whose emission wavelength in the VUV range (157 nm) at high reprate is particularly interesting in the micro-lithography field. [Italian] In questo documento viene proposto come costruire un laser a eccimeri basato su una scarica priva di elettrodi, o Dielectric Barrier Discharge. Tale laser puo' funzionare con una bassa energia per impulso (<100 mJ) ad alta frequenza di ripetizione (<100 kHz). Il vantaggio fondamentale di un laser a DBD e quindi privo di elettrodi e' la vita media della miscela gassosa molto piu' alta che potrebbe permettere alla camera laser di operare sigillata ad una potenza media superiore a quella dei laser a eccimeri attuali. Tale schema di pompaggio potrebbe essere particolarmente vantaggioso per eccitare la molecola eccimero F{sub 2} la cui lunghezza di emissione nel VUV (157 nm) ad elevata frequenza di ripetizione presenta un notevole interesse nel campo della produzione di microcircuiti.

  9. sistema Web con JSP

    Directory of Open Access Journals (Sweden)

    César Viloria Núñez

    2014-01-01

    Full Text Available Este artículo presenta el desarrollo de un sistema de información que permite la adquisición y la administración de información relacionada con los signos vitales como la presión arterial, la frecuencia cardiaca y respiratoria, y la saturación de oxígeno en la sangre de un paciente. La implementación del sistema se basa en una solución Web, permitiendo así que médicos especialistas puedan monitorear a sus pacientes desde cualquier punto conectado a la red en tiempo real y, al mismo tiempo, dar indicaciones críticas al personal médico que se encuentra en el lugar con el paciente.

  10. Transporte forestal con cables

    OpenAIRE

    Anaya L. Héctor J.

    2012-01-01

    La explotación forestal es un problema fundamentalmente de transporte. El apeo y la preparación de las trozas, aunque a veces presentan algunas dificultades, son operaciones fáciles de resolver comparadas con la operación de transporte la cual absorbe del 60% al 70% o más del costo total del aprovechamiento del bosque. El 30% o 40% restante es absorbido por las faenas previas de apeo y troceo.

  11. Encuentros con Elena Poniatowska

    OpenAIRE

    Uzquiza González, José Ignacio

    2008-01-01

    El autor analiza, desde su encuentro con Elena Poniatowska, la vertiente de la literatura testimonial como literatura de mujeres. Un análisis interior de la relación entre realidad y ficción, entre Elena, Jesusa o Tinísima. The author analyzes testimonial literature from the perspective of female literature through his meeting with Elena Poniatowska. An analysis of reality vs. Fiction in Elena, Jesusa and Tinisima.

  12. pacientes con falla cardiaca

    Directory of Open Access Journals (Sweden)

    Diana Marcela Achury Saldaña

    2007-01-01

    Full Text Available Objetivo: determinar la adherencia al tratamiento de pacientes con falla cardiaca hospitalizados, al aplicar un plan educativo quefomenta el autocuidado.Método: estudio cuasiexperimental (entrevistas enfermera-paciente realizado entre diciembre de 2004 y mayo de 2006, con unamuestra de 50 pacientes seleccionados por conveniencia. Se diseñó un instrumento para evaluar los comportamientos de los pacientes,con base en algunos resultados de la adherencia y sus respectivos indicadores de la taxonomía NOC (Nursing out comes classification. Laadherencia al tratamiento fue medida en dos momentos: el primero durante la hospitalización, seguido de la aplicación del plan educativoantes del alta, que proporcionaba información en el manejo de su enfermedad desde una dimensión física, psicológica y social quepromueve el autocuidado; y el segundo un mes después del alta en su domicilio.Resultados: diferencias estadísticamente significativas (P=0,0001 que demuestran cómo mediante la capacitación al paciente enel manejo de su tratamiento farmacológico y no farmacológico, el establecimiento de una sana relación entre el profesional de enfermeríay el paciente, y la participación de la familia, se logra una total adherencia al tratamiento.Conclusiones: para lograr una adherencia total del paciente con falla cardiaca al tratamiento es necesario un proceso educativo y unseguimiento continuo y personalizado que motive permanentemente al paciente y se le reconozca el papel protagónico en su cuidado y manejo de la enfermedad.

  13. Lectura con adolescentes

    Directory of Open Access Journals (Sweden)

    Silvia Méndez Anchía

    2007-01-01

    Full Text Available Con base en la premisa de que la lectura de textos literarios tiene una función formadora y que esta se acentúa en la adolescencia, me propongo demostrar que el cuento “Rapunzel” puede utilizarse como estrategia para explorar algunas situaciones que los sujetos adolescentes perciben como particulares en relación con su vida, pero que se inscriben dentro de grandes problemáticas estudiadas por varias disciplinas. Para ello, he identificado, desde dos marcos de referencia (sociológico y psicoanalítico, diversas problemáticas y discursos que se desprenden de la lectura del cuento realizada por dos mujeres adolescentes, quienes respondieron una guía de lectura y participaron en una entrevista a profundidad. Concluyo que la lectura y comentario del cuento hacen posible que una serie de experiencias que los sujetos adolescentes viven como únicas (como el embarazo de una amiga, las críticas de las personas adultas y las exigencias de padres y madres, ingresen en el circuito de los conocimientos generales al relacionarlas con los discursos y problemáticas en que se inscriben (por ejemplo, el discurso de la “crisis” de la adolescencia, el enfoque de derechos humanos, el mundo fantasmático materno. Por ello, recomiendo la lectura y comentario de textos literarios como estrategia didáctica para contribuir a la elaboración de la subjetividad de personas adolescentes.

  14. CO2 laser cutting

    CERN Document Server

    Powell, John

    1998-01-01

    The laser has given manufacturing industry a new tool. When the laser beam is focused it can generate one of the world's most intense energy sources, more intense than flames and arcs, though similar to an electron beam. In fact the intensity is such that it can vaporise most known materials. The laser material processing industry has been growing swiftly as the quality, speed and new manufacturing possibilities become better understood. In the fore of these new technologies is the process of laser cutting. Laser cutting leads because it is a direct process substitu­ tion and the laser can usually do the job with greater flexibility, speed and quality than its competitors. However, to achieve these high speeds with high quality con­ siderable know how and experience is required. This information is usually carefully guarded by the businesses concerned and has to be gained by hard experience and technical understanding. Yet in this book John Powell explains in lucid and almost non­ technical language many o...

  15. Investigation of laser cleaning on bronze cultural relics

    Science.gov (United States)

    Ling, Xiulan; Wang, Gao; Zhang, Chen

    2016-05-01

    The effects of laser cleaning on the corrosion layers of bronze cultural relics were studied using a pulsed fiber laser. The laser cleaning threshold value of the corrosion layers was obtained. It was found that the corrosion layer was removed successfully by employing a laser fluence value of 0.32 J cm-2 and scanning for three times. To obtain experimental evidence, laser con-focal scanning microscopy, scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDS), laser induced breakdown spectroscopy (LIBS) and laser Raman spectroscopy were employed to investigate the cleaning efficiency of corrosion layers on specimens.

  16. X-ray generation by the interaction of laser pulses of GW and high repetition rate, with solid targets of Al, Cu, Cd and Au; Generacion de rayos X por interaccion de pulsos laser de GW y alta tasa de repeticion, con blancos solidos de Al, Cu, Cd, Au

    Energy Technology Data Exchange (ETDEWEB)

    Fonseca Cuenca, C.; Rodriguez Entem, D.; Mendez Valverde, C.; Roso Franco, L.; Fernandez Gonzalez, F.

    2011-07-01

    In the present study we characterized the Bremsstrahlung radiation and X-ray emission associated with the radiation emitted during the interaction of laser pulses incident on solid targets of different material and discusses the radiation risk generated by the nature of this interaction.

  17. Cementos con cenizas volantes

    Directory of Open Access Journals (Sweden)

    Ossa M., Mauricio

    1984-03-01

    additions of 20 and 30% .

    Casi la generalidad de los estudios realizados sobre cementos con adición de cenizas volantes se refieren a sus características y comportamiento en pastas, morteros y hormigones, siempre en relación con aquéllos del cemento portland. Esta vez, se desarrolló un trabajo experimental orientado a relacionar entre sí los cementos con adiciones de cenizas volantes y de puzolana natural. Para ello se fabricaron a escala de laboratorio cementos de ambos tipos, empleando como materias primas comunes clinker y yeso y, como variables, diferentes porcentajes de las dos adiciones, que cumplieron previamente los requisitos normalizados en cuanto a sus actividades puzolánicas. La calidad de los cementos fabricados resultó adecuada y concordante con la del cemento portland-puzolánico obtenido a escala industrial con los mismos clinker, yeso y puzolana natural de este estudio. Posteriormente, se determinaron las características de los cementos experimentales y se confeccionaron morteros normales para la realización de ensayos físicos y mecánicos. Los resultados de ensayos indicaron que los cementos con adición de cenizas volantes (CCV requieren menos agua para consistencia normal, presentan tiempos de fraguado mayores y expansiones en autoclave menores que los cementos con adición de puzolana (CP. Los calores de hidratación a 7 y 28 días de edad fueron aproximadamente similares para ambos tipos de cemento. En morteros normales, los cementos CCV mostraron menor retracción de secado, mayor retentividad y mayor fluidez (para igual cantidad de agua que los cementos CP. En los ensayos de exudación se observó que ésta depende más de la finura que el tipo de adición. Finalmente, los ensayos mecánicos señalaron que las resistencias a compresión y flexotracción de los morteros con cementos CCV son menores a edades inferiores que 14 días (del orden de 5 a 10% a un día de edad, pero que a partir de entonces pasan a ser mayores que las de

  18. con problemas de aprendizaje

    Directory of Open Access Journals (Sweden)

    Claudia Jaquelina González Trujillo

    2007-01-01

    Full Text Available Un grupo de niños con diversos problemas de aprendizaje fue atendido bajo un programa de intervención de integración y adaptación social. Mejoras importantes se obtienen en competencias académicas bajo el presente programa de intervención y delimitan áreas de oportunidad para la mejora en aspectos cognitivos como el del proceso de atención e integración social. Las implicaciones de los resultados se discuten bajo un programa de apoyo psicopedagógico para la educación especial.

  19. Mayonesa con quitosano

    OpenAIRE

    Gaffrey, María Celeste

    2014-01-01

    Introducción: El quitosano es un polímero natural que se obtiene a partir de la quitina, la cual forma parte de la estructura de soporte de numerosos organismos vivos, tales como artrópodos (crustáceos e insectos), moluscos y hongos. Presenta propiedades aplicables en los alimentos, como estabilizante, emulsificante, y quelante. No puede ser digerido por los seres humanos por lo cual está considerado como una fibra dietética con un contenido calórico cero. Objetivos: Evaluar...

  20. Atender con ansiedad

    Directory of Open Access Journals (Sweden)

    Alberto Acosta

    2009-10-01

    Full Text Available Tener una personalidad ansiosa o estar ansioso en una determinada situación hace que atendamos de modo diferente a lo que acontece. Investigaciones recientes están descubriendo las relaciones específicas de la ansiedad-rasgo y de la ansiedad-estado con diferentes procesos atencionales. La intervención terapéutica para aliviar los trastornos de ansiedad, tan frecuentes en nuestra época, se va a beneficiar de este conocimiento.

  1. Creo con mis dedos

    OpenAIRE

    S??nchez Aniceto, Monta??a

    2015-01-01

    Las artes pl??sticas son muy importantes para los ni??os/as sobre todo para Educaci??n Infantil ya que promueven la creatividad mediante diferentes recursos y t??cnicas lo que favorece su motivaci??n en las competencias desde la edad temprana hasta la adolescencia. Es la primera forma que tiene el ni??o/a de expresarse en el mundo (a trav??s de los garabatos), de comunicarse, compartir sus emociones con los dem??s, creando su propio lenguaje que evolucionar?? hacia el lenguaje oral y escri...

  2. Eugenistas, pero con prudencia

    Directory of Open Access Journals (Sweden)

    Pogliano, Claudio

    1999-12-01

    Full Text Available Thinking that one could not describe eugenics like a unique movement, since numerous bound varians took place related to the geographical and cultural context, this article tries to demostrate the peculiarity of the Italian case. If already in 1889 Giuseppe Sergi wanted that the artificial selection take it to end what should make the natural, avoiding the risk of the so called «degeneration», only in the face of the First World War seems to grow the alarm for the decadent quality of the population, finding a more and more wide echo. In 1919 the Siges was born (Società italiana de genetica ed eugenica shocked under the impression of the difusse fear about the butcher the war had caused. From there from now on fastens a «nazional» direction closely related to the traditional thought and also with the new political temper. A «moderate» direction, Fascist, Catholic, that was built in consonance with the pronatalism of the regime and in rough polemic with the presumed Anglo-Saxon eugenics aberration.

    Partiendo de la base de que no se puede describir la eugénica como un movimiento unitario, ya que se produjeron numerosas variantes ligadas al contexto geográfico y cultural, este artículo intenta demostrar la peculiaridad del caso italiano. Si ya en 1889 Giuseppe Sergi deseaba que la selección artificial llevase a cabo lo que debía de hacer la natural, evitando así el riesgo de la «degeneración », sólo ante la Primera Guerra Mundial parece crecer la alarma por la decadente calidad de la población, encontrando un eco cada vez más amplio. En 1919 nació la Sige (Società italiana de genetica ed eugenica bajo la impresión del difuso temor que la carnicería bélica había provocado. De ahí en adelante prende rápidamente una dirección «nazional» que se imbrica tanto con una tradición del pensamiento como con el nuevo temple político. Una dirección «moderada» fascista, católica, que se construyó en consonancia con el

  3. Arquitectura con discurso

    OpenAIRE

    Schaposnik, Viviana

    2001-01-01

    En particular a la Carrera Arquitectura le compete un doble rol social: uno general, "educar" desde la Universidad y otro, específico, el que le es propio: dar respuesta a las necesidades planteadas por la sociedad haciéndole su lugar: construyéndolo junto con ella. Aparece la figura del "alumno de arquitectura"' nuestro destinatario específico. El alumno de arquitectura, también deberá tomar conciencia, entender, que el "espacio" que él deberá dominar a través d...

  4. Entrevista con Geoffrey Lloyd.

    Directory of Open Access Journals (Sweden)

    Fernando Colina Pérez

    2008-01-01

    Full Text Available Helenista y también sinólogo de relieve internacional, Geoffrey E. R. Lloyd nació en Londres (1933, de padres galeses. Es un gran historiador de la ciencia y del pensamiento griegos. En 1940 fue evacuado de Londres con su madre. Sus estudios significativos comenzaron, tras algún rodeo, en el King’s College donde estudiaba su hermano. Éste sería, como su padre, médico, y él mismo dudó en estudiar esa profesión, que late en sus libros. Pero un profesor de clásicas como John Raven –que redactó, con Geoffrey Kirk, Los filósofos presocráticos–, le indujo a ocuparse de la filosofía antigua; y otro maestro, William Guthrie –a quien debemos la gran Historia de la filosofía griega–, le inició, además, en la medicina griega.

  5. con la cosecha mecanizada

    Directory of Open Access Journals (Sweden)

    Arturo Martínez Rodríguez

    2006-01-01

    Full Text Available Las investigaciones dirigidas a incrementar los indicadores de eficiencia y calidad durante la cosecha mecanizada del café, constituyen un tema de gran actualidad a nivel internacional. La determinación de las propiedades físico-mecánicas de los frutos y del sistema frutopedúnculo, es una etapa indispensable durante las investigaciones relacionadas con la cosecha mecanizada de este producto. En este trabajo se brindan los resultados sobre la determinación de un grupo de propiedades dimensionales, inerciales y elásticas del sistema fruto-pedúnculo de coffea arabica variedad Catuai en diferentes estadios de maduración, relacionadas con la cosecha mecanizada de este cultivo.Así mismo se determina el momento flector requerido para la ruptura de la unión fruto pedúnculo. Durante la investigación se emplearon técnicas de procesamiento de imágenes digitales, así como de extensometría eléctrica. Como resultado de la medición de las diferentes propiedades se apreciaron diferencias sustanciales en las características dimensionales, inerciales y elásticas de los frutos maduros y verdes, así como en el momento requerido para el desprendimiento de los frutos y en las formas en que se produce el desprendimiento.

  6. Entrevista con Patricia Ariza

    Directory of Open Access Journals (Sweden)

    Esperanza Londoño La Rotta

    2017-01-01

    Full Text Available Pensamiento, Palabra y Obra entrevista a una artista, feminista y activista política, quien como mujer y artista ha permitido pensar el arte más allá de un simple espectáculo. Toda una vida dedicada al teatro y a darle voz, a través de sus obras, a víctimas del conflicto colombiano, defensora de derechos humanos; además de hacer evidente en su vida y a través de la plataforma “Artistas por la paz”, las múltiples relaciones que se pueden establecer entre el arte, la construcción de paz y la resolución de conflictos. Hablamos en su casa, en medio del calor de la bienvenida con Patricia Ariza, directora del festival alternativo de teatro, de Mujeres en Escena y de la Corporación Colombiana de Teatro, entre otras muchas actividades que voluntariamente su espíritu libertario ha asumido. Esta entrevista se realizó antes del 2 de octubre, pero con la revisión de los acuerdos que propició el plebiscito ganado por una ínfima minoría por el no, sigue siendo vigente este planteamiento.

  7. Blue Laser.

    Science.gov (United States)

    1985-12-01

    HOLLOW CATHODE LASER FABRICATION 13 4. EXPERIENCE WITH THE BLUE LASER 18 4.1 Operational and Processing Experience 18 4.2 Performance Testing 20 5...34 -. - . •. SECTION 3 BLUE HOLLOW CATHODE LASER FABRICATION This section presents an overview of the steps taken in creating a HCL. There is...to the laser assembly. These steps can actually be considered as the final steps in laser fabrication because some of them involve adding various

  8. Calcaneal tendon: imaging findings; Tendao calcaneo: avaliacao por imagem

    Energy Technology Data Exchange (ETDEWEB)

    Montandon, Cristiano; Fonseca, Cristiano Rezio; Montandon Junior, Marcelo Eustaquio [Colegio Brasileiro de Radiologia e Diagnostico por Imagem, Sao Paulo, SP (Brazil)]. E-mail: crismontandon@hotmail.com; Lobo, Leonardo Valadares; Ribeiro, Flavia Aparecida de Souza; Teixeira, Kim-Ir-Sen Santos [Goias Univ., Goiania, GO (Brazil). Hospital de Clinicas. Dept. de Diagnostico por Imagem e Anatomia Patologica

    2003-12-01

    We reviewed the radiological and clinical features of 23 patients with calcaneal tendon diseases, who were submitted to ultrasound or magnetic resonance imaging. The objective of this study was to characterize the lesions for a precise diagnosis of calcaneal tendon injuries. A wide range of calcaneal tendon diseases include degenerative lesions, inflammation of the peritendinous tissue such as peritendinitis and bursitis, and rupture. Imaging methods are essential in the diagnosis, treatment and follow-up of calcaneal tendon diseases. (author)

  9. Entrevista con Juan Marichal.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1997-01-01

    Full Text Available Juan Marichal nació en Santa Cruz de Tenerife, en 1922, en el seno de una familia ligada al partido republicano insular. Muy joven, en 1935, se trasladó a Madrid, ciudad en la que vive el estallido de la guerra civil. En 1937, pasa a Valencia y luego a Barcelona; tras su exilio en 1938, prosigue sus estudios secundarios en un liceo de París, concluyéndolos en Casablanca. En 1941 emigra a México, formándose en la UNAM: fue alumno de los exiliados José Gaos y Joaquín Xirau así como del mexicano Edmundo O 'Gorman. Luego, becado en Princeton desde 1946, lo fue de América Castro, donde preparó una tesis sobre Feijoo. Apoyado en las vastas perspectivas de sus maestros, fue orientándose hada nuestra historia intelectual, desde el siglo XV hasta hoy. Su carrera profesional se ha desarrollado en los Estados Unidos (coincidiendo con Amado Alonso y con Ferrater Mora: ha sido profesor de estudios hispánicos en la Universidad de Harvard, desde 1948 hasta 1988, año en que se jubiló voluntariamente como numerario (aunque había permanecido en el Bryn Mawr College, entre 1953 y 1957. A este trabajo se suman, con todo, sus conferencias en América Latina y en España. Ha colaborado en las revistas más importantes, en este campo, de México, Nueva York, Puerto Rico, La Habana, Buenos Aires o París así como de las españolas, desde los sesenta. Juan Marichal -hoy, miembro de la Junta Directiva de los Amigos de la Residencia de Estudiantes, director del Boletín de la Institución Libre de Enseñanza y asociado al Instituto Universitario Ortega y Gasset-, reside en España desde otoño de 1989: se considera a sí mismo «voluntario en Madrid», como había dicho Alfonso Reyes en su estancia madrileña (1914-1924.

  10. Musicalizarte con las Tics

    OpenAIRE

    Gamarra, Patricia Mabel; Velázquez, Helvecia Mercedes del Rocío; Verón, José María

    2015-01-01

    El presente trabajo hace referencia a un relato de experiencia didáctica desarrollada en el Instituto Superior de Música “Prof. Carmelo H. de Biasi” de Corrientes- Argentina, donde el área de interés de Tecnología en Educación se dirige hacia “Aplicación de las TIC en Educación/ Experiencias concretas de utilización de TIC en Educación”. En el diagnóstico realizado en la institución, se pudo observar la escasa transversalidad e interrelación con las distintas áreas curriculares como ser: l...

  11. Mirando con la cabeza

    OpenAIRE

    Corrales, Capi

    2006-01-01

    Las matemáticas y la pintura trabajan con ideas. La palabra idea viene del griego ειδω, que significa ver, mirar u observar, y de ειδοζ, que significa figura, forma, aspecto o visión. Detrás de una montaña concreta está la idea de montaña, un dibujo abstracto, unas líneas que permiten reconocer la montaña detrás de las rocas, los pinos o la nieve. La diferencia entre este árbol y árbol, entre un círculo que dibujamos en la pizarra y círculo: la diferencia entre la cosa y la idea de la cosa. E...

  12. Entrevista con Georges Duby.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1994-01-01

    Full Text Available Duby, heredero de dos grandes historiadores como Marc Bloch y Lucien Febvre, es uno de los más importantes medievalistas europeos. Fue, y sigue siendo, un motor de la importante reforma en la historia producida desde los sesenta. En sus primeros trabajos se acusa la recepción de las ideas económicas y geográficas de la mejor historiografía. Su riguroso estudio sobre la base material de la Edad Media, le permitirá luego irrumpir en la historia de las mentalidades, analizando, como decía Febvre, el utillaje mental (vocabulario, sintaxis, lugares comunes, cuadros lógicos, etc. del Medioevo. Así, el ejemplo de Mauss y LéviStrauss le anima a trabajar sobre el matrimonio, la sexualidad y ciertos sistemas del pensamiento: el primero, con su defensa de los hechos sociales totales, y el segundo, que buscaba las dimensiones simbólicas de lo social, le impulsan a trabajar sobre la ideología entendida no como mero reflejo de la situación material sino como «proyecto de acción sobre lo vivido». A su obra individual, atenta a los impulsos culturales más vivos, se suma su empuje decisivo en la realización de proyectos colectivos como la Historia de la vida privada o la Historia de las mujeres. Prácticamente, han sido traducidos todos sus libros al castellano, y han podido verse en España asimismo varios de sus programas televisivos (ha sido presidente de la SEPT, cadena de televisión cultural fundada en 1985. La amplitud de sus intereses intelectuales, transmitidos en su obra con un lenguaje a la vez muy claro y bellamente elaborado, se hace palpable también en este diálogo.

  13. preescolares desnutridos con madres con obesidad y sin obesidad

    Directory of Open Access Journals (Sweden)

    Viridiana Vanessa Conzuelo-González

    2009-01-01

    Full Text Available El primer objetivo fue conocer cuántos menores de cinco años con diferentes grados de desnutrición tienen una madre con sobrepeso/obesidad/ en una comunidad indígena que vive en extrema pobreza y bajo condiciones de migración masculina internacional. El segundo fue comparar tres variables socionutricionales (ingreso familiar, educación de la madre y adecuación nutrimental de la dieta diaria entre estos hogares y los hogares con desnutrición infantil y madres sin obesidad. Se realizó un estudio transversal (2006-2007, en la comunidad mazahua de San Francisco Tepeolulco, Municipio de Temascalcingo; que incluyó a 85 hogares integrados por preescolares con desnutrición inscritos al programa Oportunidades. Se determinó el estado nutrición de los preescolares con indicadores antropométricos y se obtuvo el IMC de las madres de estos infantes. Se aplicó una encuesta socionutricional, incluida el recordatorio de 24 horas, y complementado con la observación participante (cualitativa. Se encontró que 83% de las madres mazahuas presentaron sobrepeso u obesidad. El estado de nutrición de los preescolares con madres con obesidad presentó un porcentaje mayor de desnutrición (76%. En la variable género, se encontró que 54% de los niños con madres con obesidad tenía baja talla. Al relacionar el nivel educativo de la madre, esta variable resultó ser estadísticamente significativa (p=0.015, donde el analfabetismo está más relacionado con la desnutrición infantil que tienen madres de bajo y/o peso normal. La elevada prevalencia de hogares conformados con preescolares con desnutrición y madres con obesidad, es un síntoma más de la pobreza en zonas indígenas en México, con bajo índice de desarrollo humano.

  14. Vigas preesforzadas con refuerzo externo

    Directory of Open Access Journals (Sweden)

    Juan José Ferrer Narvaez

    2011-01-01

    Full Text Available Es de gran interés para la ingeniería colombiana el efecto del refuerzo externo de elementos estructurales con elementos metálicos. La Unidad de Estructuras ha venido realizando en el transcurso de esta década estudios en elementos en concreto con refuerzos externos a flexión con resultados satisfactorios. El proyecto ''Vigas preesforzadas con refuerzo externo" sirve de base en el estudio del comportamiento de este tipo de elementos estructurales y la extrapolación de los resultados obtenidos en elementos de concreto reforzado a concreto preesforzado.

  15. Lasers technology

    Energy Technology Data Exchange (ETDEWEB)

    NONE

    2014-07-01

    The Laser Technology Program of IPEN is developed by the Center for Lasers and Applications (CLA) and is committed to the development of new lasers based on the research of new optical materials and new resonator technologies. Laser applications and research occur within several areas such as Nuclear, Medicine, Dentistry, Industry, Environment and Advanced Research. Additional goals of the Program are human resource development and innovation, in association with Brazilian Universities and commercial partners.

  16. Entrevista con Giovanni Levi.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1999-01-01

    Full Text Available Nacido en Milán en 1939, Giovanni Levi, el importante y original historiador italiano, es heredero de una tradición familiar de grandes defensores de la libertad tanto cultural como política. En su práctica investigadora late siempre, de hecho, la memoria de un momento tan crítico de la historia italiana como el final del fascismo. Por añadidura, sus antepasados son judíos del Piamonte. Esta experiencia vital y las luchas sociales de los sesenta han marcado su quehacer como historiador y como estudioso. Levi, reconocido en Italia y asimismo en Europa y América, fue profesor en la Universidad de Turín y luego en la de Viterbo; actualmente es catedrático de Historia económica en Venecia, ejerciendo como profesor visitante en Francia. Su trabajo, muy creativo, aborda aspectos de la historia de la familia, la demografía y la agricultura en los siglos XVII y XVIII, pero su crítica como intelectual comprometido con el dudoso presente desborda su estricto ámbito de estudio.

  17. Lasers (Rev.)

    Energy Technology Data Exchange (ETDEWEB)

    Hellman, Hal

    1969-01-01

    A laser is an instrument that produces an enormously intense pencil-thin beam of light. In this booklet we shall learn what there is about the laser that gives it so much promise. We shall investigate what it is, how it works, and the different kinds of lasers there are.

  18. Characterization of the surface oxidation reaction and its influence on the radiation absorption during the surface laser hardening process of the 42CrMo4 steel; Caracterizacion de la reaccion de oxidacion superficial y su influencia sobre la absorcion de radiacion durante el proceso de temple superficial con laser para el acero 42CrMo4

    Energy Technology Data Exchange (ETDEWEB)

    Cordovilla, F.; Dominguez, J.; Sancho, P.; Garcia-Beltran, A.; Ocana, J. L.

    2016-10-01

    Surface laser hardening of steel is a process that produces an enormous interest due to its uncountable advantages in terms of quality and productivity against induction hardening The effective implantation of this process, nevertheless, is been hampered because of the lack of reliable and flexible predictive tools. There are different models focused on the temperature calculation, thought, few make a thorough analysis of the surface oxidation associated with the process and its important implications over the absorption coefficient. This work proposes and explains a coupled model temperature/ oxidation available in literature, applied, for the first time, for the simulation of simple processes carried out with different conditions of power and speed, for the 42CrMo4 steel. These conditions have been reproduced experimentally, tracking the maximum surface temperature and the oxide thickness. Both results have shown a high degree of coincidence whit theoretical predictions, confirming the capabilities and utility of the model. (Author)

  19. Entrevista con Alberto Tenenti.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1995-01-01

    Full Text Available Gran especialista en historia moderna, Alberto Tenenti nació en Viareggio, en 1924. Tras realizar estudios superiores en Italia, trabajó en el Centre National de la Recherche Scientifique varios años, asesorado por Lucien Febvre. Ha dirigido el Archivo del Estado de Brescia; y, más tarde, ha enseñado en París, desde una cátedra en la École Pratique des Hautes Études en Sciences Sociales (VI Sección, alIado de Braudel. Su Il senso della morte e l'amore della vita nel Rinascimento, de 1957, es una obra maestra sobre los orígenes de la sensibilidad moderna: sin olvidar el naciente vitalismo, estudia el desarrollo de dos motivos, el del ars moriendi, que tiene su evolución propia desde 1350 hasta su difusión impresa, y el de lo macabro, que refleja la crisis de conciencia del siglo XV y adquiere «unas dimensiones desconocidas y verdaderamente anormales». En este libro sobre un problema clave como la muerte, apela de modo notable a la iconografía: Tenenti ha recordado que la cultura tradicional, eclesiástica sobre todo, percibió un mayor peligro en la capacidad de reflexión autónoma y de crítica de los hombres de letras, que en las renovaciones radicales de los artistas. Numerosos trabajos de conjunto realizados por él han perseguido una historia global: Los fundamentos del mundo moderno; Florencia en la época de los Medicis; La formación del mundo moderno; El Renacimiento; el primero de ellos estaba firmado con un historiador de su misma generación, R. Romano, estudioso de las relaciones comerciales en la época moderna en Europa y en la América española. Tenenti ha publicado monografías (Venezia e i corsari, 1961, colecciones de artículos (Credence, ideologie, libertinismi tra medioevo ed eta moderna, 1978; Stato: un'idea, una logica. Dal comune italiano all'assolutismo francese, 1987 y editado a clásicos como Il libri della famiglia de L. B. Alberti, 1969. Es también especialista en temas económicos, como el del

  20. Puentes con vigas pretensadas

    Directory of Open Access Journals (Sweden)

    Editorial, Equipo

    1965-07-01

    Full Text Available This paper describes one of the three bridges which Hidrocivil, S. A., has built in Catalonia (northern Spain, over the river Ripoll. The other two bridges are very similar to this one, both in construction and design, and show only minor adjustments to the local topography. The contracting firm proposed several alterations in the prefabrication and constructional procedure, in relation to the initial project, and these changes were accepted. The main feature of these projects is the use of prestressed beams, built at the workshop in sections, and joined together by means of sixty 7 mm cables in each beam. As the shear forces are more acute at the joints, the end of each section has a kind of diaphragm, to provide a large contact area, and hence greater surface to transmit the shear forces. The methods of construction are also of interest. Briefly, they involve building the bridge piles, and use these to support a provisional structure with transversal movement. This provisional structure, in turn, served as platform for two bridge cranes, which lifted the girders to their final location. After the first span was completed, the deck was concreted and the auxiliary structure pushed forward to the next span, to repeat the same operations. This arrangement saved the use of provisional framework.En este trabajo se describe uno de los tres puentes que Hidrocivil, S. A., ha construido.—previo concurso— en la región catalana; concretamente, el que salva el río Ripoll. Los otros dos no han sido objeto de descripción general por ser muy similares, en lo que a ejecución y concepción se refiere, con la única variante que presentan las características topográficas locales. La empresa propuso ciertas variantes— que fueron aceptadas— en la prefabricación y métodos de construcción. El interés de estas obras se centra en el empleo de vigas pretensadas, prefabricadas en taller por trozos, y solidarizados en el mismo mediante las operaciones

  1. Entrevista con Bernard Vincent.

    Directory of Open Access Journals (Sweden)

    Fernando Colina Pérez

    2006-01-01

    Full Text Available Nacido en París (1941, Bernard Vincent es un historiador de renombre en Europa y América del Sur. Consiguió su agregación universitaria en 1966, y desde sus inicios se centró en la Historia Moderna, particularmente en grupos marginales de la España de los siglos XVI-XVII. Ha residido en nuestro país muchos años. Vincent fue miembro de la sección científica de la Casa de Velázquez inicialmente (1968-1971, algo más tarde director de estudios (1977-1978, y a continuación secretario general (1978-1982 de dicha institución. Asimismo ha encabezado el programa de cooperación francoespañol en ciencias sociales (1993-1996. Por otra parte, ha enseñado en la Universidad de París VII, en varias etapas de su vida; pero, sobre todo, ha pertenecido siempre a centros superiores de investigación: Centre National de la Recherche Scientifique (1976-1978, y a la École des Hautes Études en Sciences Sociales, en donde ha sido director de estudios desde 1988 –era doctor de Estado ya en 1986–, y luego responsable de la Sección de Historia, desde 1996 hasta hoy. Sus colaboraciones con las universidades y centros investigadores españoles han sido constantes hasta el presente. Por añadidura, ha sido miembro del Consejo Nacional de las Universidades en Francia, en lo relativo a la historia moderna y contemporánea (1987-1988, 1992-1995, y es desde hace años miembro de la madrileña Academia de la Historia.

  2. Laser device

    Science.gov (United States)

    Scott, Jill R.; Tremblay, Paul L.

    2007-07-10

    A laser device includes a target position, an optical component separated a distance J from the target position, and a laser energy source separated a distance H from the optical component, distance H being greater than distance J. A laser source manipulation mechanism exhibits a mechanical resolution of positioning the laser source. The mechanical resolution is less than a spatial resolution of laser energy at the target position as directed through the optical component. A vertical and a lateral index that intersect at an origin can be defined for the optical component. The manipulation mechanism can auto align laser aim through the origin during laser source motion. The laser source manipulation mechanism can include a mechanical index. The mechanical index can include a pivot point for laser source lateral motion and a reference point for laser source vertical motion. The target position can be located within an adverse environment including at least one of a high magnetic field, a vacuum system, a high pressure system, and a hazardous zone. The laser source and an electro-mechanical part of the manipulation mechanism can be located outside the adverse environment. The manipulation mechanism can include a Peaucellier linkage.

  3. ESTUDIO COMPARATIVO ENTRE ACUPUNTURA Y APLICACION DE LASER EN PUNTOS DE ACUPUNTURA EN EL TRATAMIENTO DE LA MIGRANA

    OpenAIRE

    RAMIREZ LABASTIDA, GUSTAVO

    2009-01-01

    EN LA CLINICA DE ACUPUNTURA DE LA ESCUELA NACIONAL DE MEDICINA Y HOMEOPATIA DEL INSTITUTO POLITECNICO NACIONAL, SE ESTUDIARON A 20 PACIENTES CON DIAGNOSTICO DE MIGRANA CON EL OBJETIVO DE COMPARAR SI LA APLICACION DE LASER EN PUNTOS DE ACUPUNTURA PODRIA TENER UNA EFECTIVIDAD SIMILAR A LA ACUPUNTURA EN EL TRATAMIENTO DE LA MIGRANA. DE MANERA ALEATORIA LOS PACIENTES FUERON ASIGNADOS AL GRUPO 1 PARA RECIBIR TRATAMIENTO CON LASER EN PUNTOS DE ACUPUNTURA O AL GRUPO 2 PARA RECIBIR TRATAMIENTO CON AG...

  4. Laser thruster

    Science.gov (United States)

    Jalufka, N. W.

    1989-01-01

    Laser propulsion can reduce fuel by 57 t to 105 t over chemical propulsion for a 144 t Lunar base, with no significant increase in trip time. Laser propulsion reduces trip time by a factor of 40 to 120 over nuclear electric propulsion and time in radiation belts by a factor of 100 to 1700. Either solar or nuclear driven laser diode arrays could produce multimegawatt beams, typically 3,700 t for a 235 MW laser system. Laser diode arrays have high payoff due to short wavelength (850 nm) and high diode efficiency (70 percent). A dry laser OTV of 8790 kg and 60 percent efficiency can transport a 144 t lunar base. Laser propulsion could carry both personnel and cargo safely to the lunar base.

  5. Matrices con entradas enteras e inversa con entradas enteras

    OpenAIRE

    Mora, Walter

    2004-01-01

    Algunos artículos publicados en The American Mathematical Monthly discuten acerca de la construcción de matrices con entradas enteras, valores propios enteros y vectores propios con componentes enteras, en particular en [1] se hace una construcción que además permite construir, de manera sencilla, matrices con entradas enteras cuya inversa también tiene entradas enteras. Este artículo trata de estas últimas construcciones e incluye software en Java para generar y modificar ejemplos y para hac...

  6. con el aborto provocado

    Directory of Open Access Journals (Sweden)

    José Luis Redondo Calderón

    2008-01-01

    Full Text Available Las vacunas de células diploides humanas (WI-38, MRC-5 tienen un origen éticamente objetable, dado que dichas células proceden de abortos provocados. Entre ellas destacan vacunas empleadas contra rubéola, sarampión, parotiditis, rabia, poliomielitis, viruela, hepatitis A, varicela y herpes zóster. Actualmente se encuentran en desarrollo otras vacunas cultivadas en células (293, PER.C6 transformadas mediante virus, procedentes de abortos. Entre ellas hay vacunas contra la gripe, virus respiratorio sincitial, parainfl uenza, HIV, virus del Nilo Occidental, virus Ébola, Marburg y Lassa, hepatitis B y C, glosopeda, encefalitis japonesa, dengue, tuberculosis, carbunco, peste, tétanos y paludismo. También con igual origen se trabaja en la elaboración de anticuerpos monoclonales y otras proteínas, terapia génica y genómica. Existe la tecnología necesaria para producir todo lo descrito sin recurrir a abortos provocados. Debe indicarse en los prospectos de vacunas y otros productos el origen de las células empleadas. Debe facilitarse el acceso a las vacunas existentes no cultivadas en células procedentes de abortos provocados. Debe potenciarse la investigación de opciones en aquellos casos en los que no exista una vacuna no originada en células procedentes de abortos provocados. Debe potenciarse la elaboración de anticuerpos monoclonales y de otras proteínas, así como la terapia génica y la genómica sin recurrir a células procedentes de abortos provocados. No sería consecuente rechazar productos obtenidos a partir de células troncales embrionarias y aceptar los originados en células procedentes de abortos provocados. Se debe evitar que la biotecnología basada en el aborto provocado invada todos los terrenos de la medicina.

  7. Perfil del trabajador con discapacidad

    OpenAIRE

    CAPGEMINI; FUNDACIÓN ADECCO

    2014-01-01

    Capgemini y la Fundación Adeco analizan y reflexionan sobre empleo de las personas con discapacidad. A pesar de los avances que se están registrando en este ámbito, la situación laboral de las personas con discapacidad aún está lejos de alcanzar las cotas deseadas de normalización: mientras que la tasa de actividad de las personas sin discapacidad se sitúa en el 76,3%, la de las que sí la tienen desciende bruscamente hasta el 36,5%. En otras palabras, un 63,4% de las personas con discapacidad...

  8. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.; Syundzo, Yo.

    1984-06-19

    It is reported that an improved gas laser design using pumping of the active medium has been developed. A diagram of the laser system is given in graph form and its principle of operation is briefly described. A special sealing element is used in such lasers to seal the reservoir containing the oil in the pump which pumps the gas active medium. When the sealing element fails, there is the danger of oil penetration into the active laser medium. It is proposed that an additional pump which continually evacuates the oil reservoir during laser system operation be used. Thus, a low pressure is maintained in the reservoir. If the sealing element fails, the secondary pump generates a gas flow from the pumping system to the reservoir and eliminates gas penetration into the laser medium.

  9. Varicela sobreinfectada con Staphylococcus Aureus

    Directory of Open Access Journals (Sweden)

    Fabiana A. Bellot

    2010-12-01

    Full Text Available Paciente masculino de 5 años de edad internado por presentar un cuadro clínico de más o menos cuatro días de evolución caracterizado por la presencia de fiebre, malestar general, anorexia y dolor abdominal leve complicándose con la aparición de erupciones en piel, cuero cabelludo, cara, tronco y mucosas de características maculo-papulosas eritematosas con un halo eritematoso. Las mismas de tamaños y formas variables, tensas, con contenido purulento, acompañado de fiebre de 38 C°. Al examen físico se evidencian: lesiones dérmicas sobreinfectadas con secreción purulenta en algunas regiones del cuerpo (rostro y tronco. El diagnóstico de ingreso fue varicela sobreinfectada por estafilococo.

  10. Biocavity Lasers

    Energy Technology Data Exchange (ETDEWEB)

    Gourley, P.L.; Gourley, M.F.

    2000-10-05

    Laser technology has advanced dramatically and is an integral part of today's healthcare delivery system. Lasers are used in the laboratory analysis of human blood samples and serve as surgical tools that kill, burn or cut tissue. Recent semiconductor microtechnology has reduced the size o f a laser to the size of a biological cell or even a virus particle. By integrating these ultra small lasers with biological systems, it is possible to create micro-electrical mechanical systems that may revolutionize health care delivery.

  11. Direct metal laser sintering: a digitised metal casting technology.

    Science.gov (United States)

    Venkatesh, K Vijay; Nandini, V Vidyashree

    2013-12-01

    Dental technology is undergoing advancements at a fast pace and technology is being imported from various other fields. One such imported technology is direct metal laser sintering technology for casting metal crowns. This article will discuss the process of laser sintering for making metal crowns and fixed partial dentures with a understanding of their pros and cons.

  12. Direct Metal Laser Sintering: A Digitised Metal Casting Technology

    OpenAIRE

    Venkatesh, K. Vijay; Nandini, V Vidyashree

    2013-01-01

    Dental technology is undergoing advancements at a fast pace and technology is being imported from various other fields. One such imported technology is direct metal laser sintering technology for casting metal crowns. This article will discuss the process of laser sintering for making metal crowns and fixed partial dentures with a understanding of their pros and cons.

  13. High power lasers & systems

    OpenAIRE

    Chatwin, Chris; Young, Rupert; Birch, Philip

    2015-01-01

    Some laser history;\\ud Airborne Laser Testbed & Chemical Oxygen Iodine Laser (COIL);\\ud Laser modes and beam propagation;\\ud Fibre lasers and applications;\\ud US Navy Laser system – NRL 33kW fibre laser;\\ud Lockheed Martin 30kW fibre laser;\\ud Conclusions

  14. con mala calidad de vida

    Directory of Open Access Journals (Sweden)

    Agustín Martín-Rodríguez

    2007-01-01

    Full Text Available En este estudio ex post facto se ha analizado si los familiares de pacientes con mala calidad de vida presentan diferencias en las variables clínicas de personalidad y relaciones familiares en función de que el paciente haya estado o no ingresado en una Unidad de Cuidados Intensivos. Seleccionamos dos grupos: 29 familiares de pacientes traumatizados graves transcurridos cuatro años de su ingreso en una UCI de Traumatología y con mala calidad de vida (debido a secuelas físicas y/o psicológicas tras el ingreso, tales como traumatismos craneoencefálicos, politraumatismos y tetraplejias traumáticas y 32 familiares de pacientes con mala calidad de vida con cuatro años de evolución de su enfermedad física (hipertensión, diabetes, artritis reumatoide y síndrome de intestino irritable que no han estado ingresados en la UCI. Para alcanzar nuestro objetivo empleamos una Encuesta Psicosocial y los siguientes instrumentos: Cuestionario de Análisis Clínico, Escala de Clima Social en la Familia y Escala de Adaptación Psicosocial de la Enfermedad. Los resultados mostraron que los familiares de pacientes con mala calidad de vida que estuvieron ingresados en la UCI hace cuatro años, presentan diferencias significativas en las variables agitación y expresividad comparados con los familiares de pacientes con mala calidad de vida que no han estado ingresados en la UCI.

  15. Encuentro con el tiempo: Adagio con variaciones de Alfredo Aracil

    Directory of Open Access Journals (Sweden)

    Rosa María Rodríguez Hernández

    2012-01-01

    Full Text Available Examinando analíticamente la obra sinfónica Adagio con variaciones de Aracil, estudiaremos los principales componentes para concluir con una evaluación de los mismos. A través de la cronología de la obra de Aracil175, observamos la importancia que adquiere en su trayectoria la memoria; su pensamiento va siempre unido a ésta. Uno de sus recursos principales es la cita; es Adagio con variaciones donde claramente observaremos la memoria lejana e inmediata al tiempo: Wagner es el punto de referencia al pasado, Wolf impulsa hacia el presente, y, Aracil advierte el devenir en cada una de sus variaciones.

  16. Laser yellowing

    Indian Academy of Sciences (India)

    M B Sai Prasad; Salvatore Siano

    2010-12-01

    Over the past few years there has been an increasing interest in researches related to the application of lasers in conservation, analysis and diagnostics of artwork surfaces. Among the many interesting problems to be tackled, one issue was drawing more interest because of the limitations it can impose on the use of lasers. Laser yellowing is a phenomenon wherein artwork surfaces assume a yellow hue when cleaned with Q-switched Nd:YAG (1064 nm) lasers in particular. Here the effect of yellowing has been studied and quantified for artwork surfaces (marble) using SFR Nd:YAG and LQS Nd:YAG lasers. Colorimetric measurements by employing a spectroradiometer helps to quantify the effect of yellowing by analysing three variables (chromaticity coordinates) of interest.

  17. Los nenes con los zombies, las nenas con los vampiros

    OpenAIRE

    López Corral, Manuela

    2012-01-01

    En este artículo nos circunscribiremos, dentro de este género literario, a las sagas de reciente salida editorial y, con mayor precisión, a las sagas de novelas románticas para adolescentes tales como Crepúsculo (Stephenie Meyer, 2005), Hush Hush (Becca Fitzpatrick, 2009), Cazadores de Sombras (Cassandra Clare, 2007), Fallen (Lauren Kate, 2010), y otras similares, dejando de lado sagas con otro tipo de particularidades como los citados libros de Harry Potter o los pertenecientes a la trilogía...

  18. Entrevista con Hans Robert Jauss.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1997-01-01

    Full Text Available El importante teórico y crítico literario alemán nació en 1921. Tras el largo paréntesis de la segunda guerra mundial, Jauss realizará sus estudios superiores, a partir de 1948, en Heidelberg, licenciándose en filología románica. Se doctora pronto con una tesis, publicada en 1955, sobre el tiempo y el recuerdo en la obra capital de Marcel Proust, En busca del tiempo perdido, y se habilita en 1957 con un trabajo sobre la epopeya animal en la Edad Media. A continuación, escribe un conjunto de estudios sobre la alegoría, y codirige con el gran especialista Erich Kohler una monumental historia de la literatura medieval, campo al que ha dedicado otros artículos, a la par que proseguía sus investigaciones iniciales.

  19. High throughput laser processing

    Science.gov (United States)

    Harley, Gabriel; Pass, Thomas; Cousins, Peter John; Viatella, John

    2016-12-27

    A solar cell is formed using a solar cell ablation system. The ablation system includes a single laser source and several laser scanners. The laser scanners include a master laser scanner, with the rest of the laser scanners being slaved to the master laser scanner. A laser beam from the laser source is split into several laser beams, with the laser beams being scanned onto corresponding wafers using the laser scanners in accordance with one or more patterns. The laser beams may be scanned on the wafers using the same or different power levels of the laser source.

  20. "LASER" EN MEDICINA Y CIRUGIA

    Directory of Open Access Journals (Sweden)

    Jaime Gómez Gonzalez

    1985-12-01

    Full Text Available

    El Laser es un instrumento de gran utilidad en diferentes campos de la medicina y la cirugía. Su aplicación se ha limitado en los países Latinoamericanos por el alto costo de la tecnología que representan estos equipos. En este artículo se presentan algunas de las aplicaciones del Laser en susdiversas modalidades.


    ABREVIATURAS: LF = Baja frecuencia; MF = Frecuencia media; HF = Frecuencia alta; TV= Televisión; VHF= Frecuencia muy alta; UHF = Frecuencia superalta; FM= Frecuencia modulada; FIR =Zona infrarroja lejana; NIR= Zona infrarroja cercana.


    La aplicación del Laser en la medicina y cirugía constituye uno de los grandes avances de la ciencia, pues con este instrumento se han podido realizar procedimientos imposibles de practicar con otros métodos. La posibilidad de cortar, coagular y vaporizar los tejidos sin tocarlos o con manipulación mínima se traduce en disminución del tiempo operatorio, reducción de la hemorragia (lo que permite intervenir enfermos con trastornos de coagulación, paso inocuo a través de zonas infectadas, acceso más fácil a las cavidades del cuerpo y cirugía prácticamente atraumática. El Laser fue producto de la aplicación práctica de las investigaciones básicas de Einstein, quien formuló la teoría foto-eléctrica merecedora del Premio Nobel en 1917. El primer Laser de Rubí fue construido por Maiman en 1960; poco después Patel desarrolló el Laser de CO2. En 1965 empezaron las investigaciones para sus múltiples aplicaciones en medicina y cirugía y a final de los afias setenta fue aprobado para uso clínico en los Estados Unidos, Europa y el Japón...

  1. Efficient self-sustained pulsed CO laser

    NARCIS (Netherlands)

    Peters, P.J.M.

    1978-01-01

    In this paper a simple sealed-off TEA CO laser is described with a self-sustained discharge without an external UV preionization source. At 77 K this system yields more than 600 mJ from a lasing volume of about 60 cm3 CO-N2-He mixture (45 J/ℓ atm. with 15.6% efficiency).

  2. Acupuncture laser in treating headache pain

    Science.gov (United States)

    Smesny, Dunja B.

    1990-09-01

    Cervicoocipital headache observed in 112 patient were treated, half of them with acupuncture, and other 50% with He-e laser (con tinuous emission- lo mW, 633nm: IEC). With this treatment was also combined an exercise program ne cesary for the mobilisation of functionaly blocked vertebral segment.

  3. Tratamiento con implantes Leader-Nano en paciente con oligodoncia

    Directory of Open Access Journals (Sweden)

    Salvador Javier Santos Medina

    2015-03-01

    Full Text Available Los implantes dentales de titanio han revolucionado el mundo de la rehabilitación desde su surgimiento. De manera particular, el empleo de implantes de carga inmediata acorta el tiempo quirúrgico y protésico, con el consiguiente bienestar estético. Se presenta el caso de una paciente femenina de 32 años de edad, con antecedentes de oligodoncia de ambos incisivos laterales superiores y portadora de prótesis parcial acrílica. Fue atendida por el equipo multidisciplinario de implantes en la Clínica Estomatológica Docente “3 de Octubre” y se le realizó tratamiento de rehabilitación integral con implantes Leader-Nano y prótesis fija con corona acrílica sobre dichos implantes. La implantología fue satisfactoria en la paciente; la mejoría estética y funcional, así como la satisfacción de la paciente, fueron los principales logros obtenidos

  4. [Lipolysis lasers].

    Science.gov (United States)

    Mazer, J-M

    2009-10-01

    We use lipolysis lasers for around five years. The principle of those lasers is that, for some wavelengths, the fat, located in the adipocytes reacts as a chromophor. In order to allow the direct exposure of the adipocytes to the optical fiber (around 1mm diameter), this has to be inserted in the hypodermis, then move back and forth inside the treated areas. The theorical benefits, compared to the liposuction procedures are related to the fact that the thermal effect of the laser emission allows to avoid laxity, sometimes observed after a liposuction. If we consider the first publications related to this emerging procedure, the profile of tolerance seems good, and even possibly better than the liposuctions. Nevertheless, this procedure with lasers is still a surgical procedure, exposing theorically to the side effects related in and after each surgery: infections, ecchymosis... Recently, some cases of severe side effects (infection of the skin, and necrosis) have been reported. They seem to be related to a homogeneous distribution of the energy inducing an excessive thermal injury. Some new improvements, with the last generation lasers, could allow us to avoid, or at least to dramatically reduce those side effects. The efficacy of those lasers is visibly satisfying; the key question is to precise the optimal modalities of use : in a surgery room, after an optimal training, with the last generation lasers?

  5. ARLAB: Laboratorio con Realidad Aumentada

    OpenAIRE

    Rodríguez Calderón, Rosalino; Santillana Arbesú, Rafael

    2013-01-01

    ResumenARLAB es una innovación que incorporar tecnología de realidad aumentada a los experimentos clásicos decontrol y automatización industrial, permitiendo integrar y que interactúen varias tecnologías desarrollándoseexperimentos mixtos, parte real y parte virtual en 3D, que se visualiza con un dispositivo inteligente, como lo esun celular o tableta electrónica; con el fin de generar una visión del conocimiento más profunda y clara.

  6. Huevos enriquecidos con omega 3

    OpenAIRE

    Viteri, Evelyn

    2013-01-01

    El presente trabajo es una contribución al estudio de usos de ingredientes no tradicionales; harina de algas, Macrocystis pyrifera, y la inclusión en raciones para aves de postura destinado a aumentar la concentración de omega 3 del huevo. Objetivo: Evaluar en la alimentación de la gallina la inclusión de harina de alga marina Macrocystis pyrifera con el fin de aumentar el valor de omega 3 en el huevo, y el grado de aceptación de un producto elaborado con el mismo en estudiante...

  7. con dietas suplementadas con Cromo-L-metionina

    Directory of Open Access Journals (Sweden)

    Ram\\u00F3n Garc\\u00EDa-Castillo

    2006-01-01

    Full Text Available Un total de 48 cerdos (Sus scrofa domesticus; 24 machos castrados y 24 hembras cruzados (Yorkshire, Hampshire, Duroc y Landrace de 3,5 a 4,0 meses de edad y 60,0 ± 5,0 kg PV en finalización. Se alimentaron con dietas isoproteícas (14,5 % PC e isoenergéticas (3.400 kcal EM/kg de MS, adicionadas con Cr-L-metionina (MiCroPlex® (0, 200, 400 y 600 ppb. El experimento tuvo una duración de 45 días y se realizó de agosto a noviembre del 2002 en las instalaciones de la Universidad Autónoma Agraria Antonio Narro, localizada en Saltillo, Coahuila, México. Al tener los animales aproximadamente 95 kg PV, se tomó muestra de 15 ml de sangre por cada animal para determinar la concentración de glucosa, ácido úrico, creatinina, urea, proteinas totales y colesterol. Se aplicó un diseño completamente al azar con arreglo factorial 2 x 4; dos para el factor sexo y cuatro para nivel de cromo. Los metabolitos en suero no fueron afectados (P>0,05 por el factor sexo. La glucosa en suero disminuyó (P<0,05 y el colesterol incrementó (P<0,05 con cromo en la dieta. Se concluye que el Cr incrementa el metabolismo de glucosa y disminuye el de colesterol, con lo cual puede haber energía disponible para síntesis de proteína la cual es necesaria para el crecimiento de los animales

  8. Laser spectroscopy

    CERN Document Server

    Demtröder, Wolfgang

    2008-01-01

    Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., frequency doubling in external cavities, reliable cw-parametric oscillators, tunable narrow-band UV sources, more sensitive detection techniques, tunable femtosecond and sub-femtosecond lasers (X-ray region and the attosecond range), control of atomic and molecular excitations, frequency combs able to synchronize independent femtosecond lasers, coherent matter waves, and still more applications in chemical analysis, medical diagnostics, and engineering.

  9. Laser spectroscopy

    CERN Document Server

    Demtröder, Wolfgang

    Keeping abreast of the latest techniques and applications, this new edition of the standard reference and graduate text on laser spectroscopy has been completely revised and expanded. While the general concept is unchanged, the new edition features a broad array of new material, e.g., ultrafast lasers (atto- and femto-second lasers) and parametric oscillators, coherent matter waves, Doppler-free Fourier spectroscopy with optical frequency combs, interference spectroscopy, quantum optics, the interferometric detection of gravitational waves and still more applications in chemical analysis, medical diagnostics, and engineering.

  10. Semiconductor laser

    Energy Technology Data Exchange (ETDEWEB)

    Ito, K.; Shyuue, M.

    1982-09-25

    A distributed feedback semiconductor laser is proposed which generates several beams with equal wavelengths in different directions. For this purpose, 1 millimeter grooves are cut into the surface of an n-type conductance GaAs plate in three different directions; these grooves form a diffraction grating. The center of this plate has no grooves and is bombarded by an He/Ne laser beam. The diffraction gratings provide resonance properties and generate laser beams with wavelengths of 8850, 9000 and 9200 angstroms.

  11. Un momento con el maestro

    OpenAIRE

    Poblete Garaycochea, Luis; Universidad Nacional Mayor de San Marcos

    2014-01-01

    Quiero comenzar, manifestando mis experiencias de comunicación teniendo como fundamento teórico a Carl ROGERS, "El camino del Ser", obra que me sirvió de inspiración e identificación con su pensamiento en el proceso del desarrollo como ser humano.

  12. A vueltas con Samuel Beckett

    Directory of Open Access Journals (Sweden)

    José María Fernández Cardo

    2010-01-01

    Full Text Available A propósito de la obra de Lourdes Carriedo, Mª Luisa Guerrero, Carmen Méndez y Fabio Vericat(eds.: A vueltas con Beckett. Aproximaciones críticas en su centenario (Madrid, Ediciones de La Discreta,col. «Bártulos», 2009, 362 páginas, ISBN: 978-84-96322-29-5.

  13. [Laser myringotomy].

    Science.gov (United States)

    Hassmann-Poznańska, Elzbieta; Skotnicka, Bozena

    2002-01-01

    The aim of the study was assessment of the qualities of laser-assisted myringotomy (LAM) as a treatment for acute and secretory otitis media. Laser-assisted myringotomy was performed on 65 children (113 ears) mean age 6.2 years diagnosed with secretory otitis media (80%), recurrent secretory otitis media (11%) and acute otitis media (9%). Myringotomy was performed under general anesthesia using the OtoLAM device (ESC/Sharplan, Israel). In 64 ears pressure equalisation tubes were inserted after fenestration of the tympanic membrane with laser. Adenoidectomy alone or with tonsillectomy was performed at the same time in 51 cases. Laser tympanostomies remained patent for 7-32 days. All tympanostomies healed with no noticeable scarring. LAM appears to be a safe, and easy to performed, alternative technique in the treatment of otitis media.

  14. Laser Refractography

    CERN Document Server

    Rinkevichyus, B.S; Raskovskaya, I.L

    2010-01-01

    This book describes the basic principles of laser refractography, a flexible new diagnostic tool for measuring optically inhomogeneous media and flows. Laser refractography is based on digital imaging and computer processing of structured laser beam refraction (SLR) in inhomogeneous transparent media. Laser refractograms provide both qualitative and quantitative measurements and can be used for the study of fast and transient processes. In this book, the theoretical basis of refractography is explored in some detail, and experimental setups are described for measurement of transparent media using either 2D (passed radiation) or 3D (scattered radiation) refractograms. Specific examples and applications are discussed, including visualization of the boundary layer near a hot or cold metallic ball in water, and observation of edge effects and microlayers in liquids and gases. As the first book to describe this new and exciting technique, this monograph has broad cross-disciplinary appeal and will be of interest t...

  15. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.

    1984-06-19

    It is reported that an improved laser design employing pumping of the active gas medium has been developed. A diagram of the laser system is given and its principle of operation is described in detail. Gas pumping is achieved using a pump whose oil reservoir is sealed by a sealing element. When the sealing element fails, the oil from the reservoir pollutes the laser substance. It is proposed that an additional oil reservoir pumping loop be used to maintain a lower pressure. The reservoir pressure is recorded by a sensor. When the sealing element fails, the pressure in the reservoir increases. The sensor records the change in pressure and generates a signal which shuts down the laser system. Thus, the possibility for oil penetration into the gas system is totally eliminated.

  16. Green lasers

    DEFF Research Database (Denmark)

    Jensen, Ole Bjarlin

    2010-01-01

    Well over a dozen papers at this year's Photonics West meeting in San Francisco boasted improvements in harmonic generation to produce visible laser beams, most of them in the green spectral range......Well over a dozen papers at this year's Photonics West meeting in San Francisco boasted improvements in harmonic generation to produce visible laser beams, most of them in the green spectral range...

  17. Con

    DEFF Research Database (Denmark)

    Graudal, Niels

    2016-01-01

    Scientific evidence to support the recommended salt intake of ..., health authorities use BP effects obtained in studies of pre-hypertensive and hypertensive patients to recommend SR in the healthy population and use these biased BP effects in statistical models indirectly to project millions of saved lives. These fantasy projections are in contrast to real data from...

  18. Laser Physics and Laser Techniques

    Science.gov (United States)

    1989-06-01

    Other types of laser-assisted materials process- Planck Institute for Quantum Optics. Garching . West ing and machining, including laser cutting, welding...detectors with microstructured electrodes, 134[ G. N. Maracas. G. L. Harrs, C. A. Lee. and R. A. McFarlane. Opt. Le’tt., vol. 7, pp. 575-577, Dcc . 1982...A. E. Siegman Max-Planck Institut f’r Quantenoptik, D-8046 Garching , West Germany and E. L. Ginzton Laboratory, Stanford University, Stanford

  19. Literatura con mayúsculas

    Directory of Open Access Journals (Sweden)

    Cerrillo, P.

    2006-11-01

    Full Text Available En este trabajo se presenta un acercamiento alconcepto de la Literatura Infantil y Juvenil a travésde una breve visión diacrítica desde sus orígeneshasta nuestros días, subrayando los usos particularesmás característicos de esta literatura en cadaépoca (didáctico, doctrinal, proselitista…. Ademásde señalar sus coincidencias con la Literatura engeneral, se pone también de relieve sus particularidadesy características específicas, en lo que noes sino un nuevo intento de delimitar la caracterizaciónde la LIJ (contenidos, temática, estructuraliteraria, forma, ediciones… y reivindicar estaLiteratura con mayúsculas.

  20. Laser therapy for cancer

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/patientinstructions/000905.htm Laser therapy for cancer To use the sharing features ... Lasers are also used on the skin. How Laser Therapy is Used Laser therapy can be used ...

  1. pacientes con insuficiencia renal terminal

    Directory of Open Access Journals (Sweden)

    Karen Herrera Herrera

    2011-01-01

    Full Text Available La presente investigación fundamenta en la clínica psicoanalítica el estudio de dos casos de tres personas diagnosticadas con IRT que reciben tratamiento de hemodiálisis, en razón a que dadas las características y el aumento de los reportes que se presentan, ya esto se considera un problema de salud pública. El objetivo principal es describir las características dinámicas del proceso de duelo en pacientes con IRT en un centro de terapia renal de la ciudad de Cartagena. El procedimiento metodológico empleó un diseño de tipo cualitativo; la investigación se desarrolló con un diseño clínico mediante el estudio de casos, y fundamentada en la hermenéutica psicoanalítica. Todo esto respaldado en la historia clínica, la entrevista semiestructurada individual y familiar, los test proyectivos, test del dibujo de la figura humana Machover y TAT de Murray, para la debida integración de los análisis. Se concluye que predominan funciones fallidas de los progenitores y que son individuos provenientes de familias psicosomáticas, que utilizan la enfermedad para obtener un beneficio secundario.

  2. con bajo peso al nacer

    Directory of Open Access Journals (Sweden)

    Adriana Mora Antó

    2005-01-01

    Full Text Available Esta investigación dio cuenta de la relación entre el estilo de funcionamiento familiar, los patrones de crianza y las edades de desarrollo evolutivo en niños, nacidos con bajo peso. El estudio descriptivo correlacional se realizó con 41 niños y sus madres, aplicándose cuestionarios sobre funcionamiento familiar, prácticas de crianza y desarrollo infantil. Los resultados señalaron la existencia de un funcionamiento familiar caracterizado por una cohesión amalgamada y una adaptabilidad caótica, una disciplina complaciente, falta de control y de límites claros en la díada madre-hijo. Se trataba de familias monoparentales, donde la temprana edad de concepción, el madresolterismo y el apoyo de la familia extensa eran constantes. Las edades evolutivas registradas indicaron un desarrollo inferior a la edad cronológica, en la mayor parte de los casos; sin embargo, éstas tendieron a ser superiores al compararlas con la edades reales de los infantes. No se encontró una correlación estadísticamente significativa entre la edad de desarrollo y los diferentes factores del funcionamiento familiar para algunos de los rangos de edad considerados; sin embargo, no se lo descartó por completo, especialmente en lo referente al optimismo familiar

  3. Laser acceleration

    Science.gov (United States)

    Tajima, T.; Nakajima, K.; Mourou, G.

    2017-02-01

    The fundamental idea of Laser Wakefield Acceleration (LWFA) is reviewed. An ultrafast intense laser pulse drives coherent wakefield with a relativistic amplitude robustly supported by the plasma. While the large amplitude of wakefields involves collective resonant oscillations of the eigenmode of the entire plasma electrons, the wake phase velocity ˜ c and ultrafastness of the laser pulse introduce the wake stability and rigidity. A large number of worldwide experiments show a rapid progress of this concept realization toward both the high-energy accelerator prospect and broad applications. The strong interest in this has been spurring and stimulating novel laser technologies, including the Chirped Pulse Amplification, the Thin Film Compression, the Coherent Amplification Network, and the Relativistic Mirror Compression. These in turn have created a conglomerate of novel science and technology with LWFA to form a new genre of high field science with many parameters of merit in this field increasing exponentially lately. This science has triggered a number of worldwide research centers and initiatives. Associated physics of ion acceleration, X-ray generation, and astrophysical processes of ultrahigh energy cosmic rays are reviewed. Applications such as X-ray free electron laser, cancer therapy, and radioisotope production etc. are considered. A new avenue of LWFA using nanomaterials is also emerging.

  4. Header For Laser Diode

    Science.gov (United States)

    Rall, Jonathan A. R.; Spadin, Paul L.

    1990-01-01

    Header designed to contain laser diode. Output combined incoherently with outputs of other laser diodes in grating laser-beam combiner in optical communication system. Provides electrical connections to laser diode, cooling to thermally stabilize laser operation, and optomechanical adjustments that steer and focus laser beam. Range of adjustments provides for correction of worst-case decentering and defocusing of laser beam encountered with laser diodes. Mechanical configuration made simple to promote stability and keep cost low.

  5. Dyestuff laser

    Energy Technology Data Exchange (ETDEWEB)

    Brinkmann, U.; Raue, R.; Schellhammer, C.; Telle, H.

    1981-06-16

    Laser light in the wavelength range of 400 - 480 nm is obtained with a dyestuff laser containing a dyestuff of the general formula wherein E denotes one of the radicals R1-R4 independently of one another denote hydrogen, alkyl, trifluoromethyl, alkoxy, aralkoxy, halogen, alkenyloxy, the carboxyl, cyano, alkylsulphone, arylsulphone, carboxamide or sulphonamide group or the carboxylic acid ester group, or R1 and R2, or R3 and R4, conjointly represent a fused benzene ring and M and N independently of one another denote 0, 1 or 2, with the proviso that the radical E contains at least one sulphonic acid group if M and N represent 0, and wherein the radical E can be further substituted, in a solvent which does not interfere with the emission, at a concentration, which emits laser beams, of, preferably, 10-2 to 10-5 mols/liter.

  6. A laser

    Energy Technology Data Exchange (ETDEWEB)

    Togo, N.

    1984-06-19

    The development of an improved gas laser system employing pumping of the active gaseous medium is reported. The layout of the design is given and its principle of operation is described in detail. The oil reservoir in the vacuum pump which pumps the gas through the laser system is separated by a sealing element; when this element fails, the oil may pollute the active medium. It is proposed that an additional oil reservoir pumping loop be used with the pump that operates continuously and maintains a lower pressure in the reservoir. The pressure in the reservoir is monitored by a special sensor. When the sealing element fails, the pressure sensor records the pressure drop in the oil reservoir. A signal is then generated and the laser system ceases operation, and eliminates the possibility for the oil penetrating into the pumping system.

  7. Laser Heterodyning

    CERN Document Server

    Protopopov, Vladimir V

    2009-01-01

    Laser heterodyning is now a widespread optical technique, based on interference of two waves with slightly different frequencies within the sensitive area of a photo-detector. Its unique feature – preserving phase information about optical wave in the electrical signal of the photo-detector – finds numerous applications in various domains of applied optics and optoelectronics: in spectroscopy, polarimetry, radiometry, laser radars and Lidars, microscopy and other areas. The reader may be surprised by a variety of disciplines that this book covers and satisfied by detailed explanation of the phenomena. Very well illustrated, this book will be helpful for researches, postgraduates and students, working in applied optics.

  8. Laser barometer

    Science.gov (United States)

    Abercrombie, Kevin R.; Shiels, David; Rash, Tim

    2001-02-06

    A pressure measuring instrument that utilizes the change of the refractive index of a gas as a function of pressure and the coherent nature of a laser light to determine the barometric pressure within an environment. As the gas pressure in a closed environment varies, the index of refraction of the gas changes. The amount of change is a function of the gas pressure. By illuminating the gas with a laser light source, causing the wavelength of the light to change, pressure can be quantified by measuring the shift in fringes (alternating light and dark bands produced when coherent light is mixed) in an interferometer.

  9. Density-functional calculations of Con+,Con, Con- (n≤5) clusters%Con+,Con,Con -(n≤5)团簇的密度泛函理论研究

    Institute of Scientific and Technical Information of China (English)

    张蓓; 陈楚; 张军

    2011-01-01

    The geometrical and electronic structures of Con+ ,Con,Con- (n≤5) clusters had been investigated using spin-polarized DFT calculations. The ground-state structures of Con+ ,Con,Con- (n≤5) clusters evoluted from one-dimension to three dimensional configurations. The total magnetic moment showed monotonic increase with size up to 5, which alternated with odd and even numbers. The interaction strengths between Con+-1(n≤5) cluster and Co atom were much more stronger. The electronic affinities (EA)and ionization potential (IP)also had been discussed in this work.%本文采用基于自旋极化的密度泛函理论系统研究了Con+,Con,Con- (n≤5)团簇的几何结构和电子结构特性.随尺寸的递增,Con,Con± (n≤5)团簇的基态几何结构由一维演变为三维的几何构型.总磁矩随尺寸的增加线性递增,并呈现奇偶交替的现象,从Con,Con±(n≤5)团簇系统中分离一个Co原子带正电的团簇体系需要的能量相对较大.本文对体系的电子亲和能(EA)以及离化势(IP)也进行了讨论.

  10. Welfare – con o senza stato

    DEFF Research Database (Denmark)

    Bengtsson, Steen

    Welfare – con o senza stato analizza una vasta gamma di servizi sociali presenti a Padova, comprandoli con quelli di una cittá di dimensioni simili, Århus. La ricerca pertanto illustra la concreta erticolazione del sisterma di sicurezza sociale danese, confrontadolo con quello realizzato del nord...

  11. Efectos de la sobredosificación con láser de arseniuro de galio sobre el cuádriceps de ratas

    OpenAIRE

    Mónica Mercado L.; Cristina Pallares V.; Sebastián González A.; Marcelo Toledo S.

    2012-01-01

    RESUMENObjetivo. Obtener información de los efectos de la irradiación con laser con el objeto de determinar dosis en la que se observen efectos deletéreos sobre el tejido muscular. Materiales y métodos. Se estudiaron 20 ratas macho Sprague Dawley y fueron divididas aleatoriamente en cuatro grupos de 5 individuos. En todos los grupos se realizó la irradiación con laser, empleando un equipo de diodo de Arseniuro de Galio. Se aplicó en forma puntual 1 vez al día durante 10 días consecutivos. El ...

  12. Con A affinity glycoproteomics of normal human liver tissue

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    In order to establish the novel high throughput, high efficiency and low cost technological platform for the research of N-glycoproteomics, to resolve the significance of characteristic expression profile of glycoprotein and to find the proteins with biological functional importance, the glycoproteins with high-mannose core and the two antennary types were purified and enriched by the Con A affinity chromatography. Con A affinity protein expression profiles of normal human liver tissue were gener- ated by using SDS-PAGE, two-dimensional electrophoresis (2-DE) followed by fast fluorescence stain- ing based on multiplexed proteomics (MP) technology. 301 visible protein spots on the gel were de- tected and 85 of glycoproteins were further successfully identified via peptide mass fingerprinting (PMF) by a matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF- MS/MS) and annotated to IPI databases. Identified glycoproteins definitely take part in the regulation of cell cycle and metabolic processes. The glycosylation sites were predicted with NetNGlyc 1.0 and NetOGlyc 3.1 software, meanwhile they were classified according to the geneontology methods. The construction of Con A affinity glycoprotein database of normal human liver tissue would contribute to the subsequent research.

  13. Con A affinity glycoproteomics of normal human liver tissue

    Institute of Scientific and Technical Information of China (English)

    SUN QiangLing; LU HaoJie; LIU YinKun; LU WenJing; CHENG Gang; ZHOU HaiJun; ZHOU XinWen; WEI LiMing; DAI Zhi; GUO Kun

    2007-01-01

    In order to establish the novel high throughput, high efficiency and Iow cost technological platform for the research of N-glycoproteomics, to resolve the significance of characteristic expression profile of glycoprotein and to find the proteins with biological functional importance, the glycoproteins with high-mannose core and the two antennary types were purified and enriched by the Con A affinity chromatography. Con A affinity protein expression profiles of normal human liver tissue were generated by using SDS-PAGE, two-dimensional electrophoresis (2-DE) followed by fast fluorescence staining based on multiplexed proteomics (MP) technology. 301 visible protein spots on the gel were detected and 85 of glycoproteins were further successfully identified via peptide mass fingerprinting (PMF) by a matrix assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS/MS) and annotated to IPI databases. Identified glycoproteins definitely take part in the regulation of cell cycle and metabolic processes. The glycosylation sites were predicted with NetNGlyc 1.0 and NetOGlyc 3.1 software, meanwhile they were classified according to the geneontology methods. The construction of Con A affinity glycoprotein database of normal human liver tissue would contribute to the subsequent research.

  14. Tratamiento del paciente con artrosis

    OpenAIRE

    2014-01-01

    El manejo terapéutico del paciente con artrosis tiene como objetivo disminuir la sintomatología dolorosa e inflamatoria, mejorar la capacidad funcional del paciente y la aplicación de intervenciones terapéuticas eficaces y lo más seguras posibles. Un enfoque centrado en el paciente implica su participación activa en el diseño del plan terapéutico y en la toma de decisiones informadas oportunas en todas las etapas de la enfermedad. La educación terapéutica, la actividad física y el ejercicio t...

  15. Conversando con... ALBERTO CAMPO BAEZA

    OpenAIRE

    Granero Martín, Francisco; Millán-Millán, Pablo-M.

    2014-01-01

    [EN] Interview with Alberto Campo Baeza, who is an architect and Project profesor in the Architecture School of Madrid. He has just been awarded the Teachinbg Excellency Award issued by the Technical University of Madrid and the 2013 Tessenow Gold Medal [ES] Entrevista con Alberto Campo Baeza, que es arquitecto y catedrático de proyectos de la Escuela de Arquitectura de Madrid. Acaba de recibir el Premio de Excelencia Docente de la Universidad Politécnica de Madrid y la Medalla de Oro Tes...

  16. Paniculitis en paciente con dermatomiositis

    OpenAIRE

    Arias,Mariana; Hernández,María Inés; Cunha,Lais Gomes Barbosa; Kien,María Cristina; Abeldaño, Alejandra

    2011-01-01

    La paniculitis es una manifestación cutánea infrecuente de la dermatomiositis. Puede preceder hasta en 14 meses a otras manifestaciones de la dermatomiositis. En todos los casos, la miositis y la paniculitis presentan mejoría simultánea durante el tratamiento. Describimos una paciente de sexo femenino de 30 años que presenta lesiones clínica e histológicamente compatibles con paniculitis luego de 2 meses de que el compromiso muscular y cutáneo permitió el diagnóstico de dermatomiositis. Las l...

  17. Dye laser

    Energy Technology Data Exchange (ETDEWEB)

    Telle, H.; Schieder, R.; Raue, R.; Eckstein, U.

    1980-05-22

    For a laser radiating in the range of wavelengths from 420 to 480 nm dye solutions are proposed. The dyes are produced by transformation of 4,4'-biphenylene-bis-(methylenoxy-2-benzaldehydes) or their bisaniles in bipolar aprotic solvents adding strongly basic alkali compounds to the benzofurans and subsequent sulfonation.

  18. Laser device

    DEFF Research Database (Denmark)

    2013-01-01

    The present invention provides a light source for light circuits on a silicon platform. A vertical laser cavity is formed by a gain region arranged between a first mirror structure and a second mirror structure, both acting as mirrors, by forming a grating region including an active material...

  19. Recubrimientos superficiales con láseres de diodos de alta potencia

    Directory of Open Access Journals (Sweden)

    Molpeceres, J. L.

    1998-04-01

    Full Text Available Nowadays, high power diode laser systems are available in the market. These systems, based on arrays of small diode lasers, can achieve more than 1 kW of output power and are currently offering new possibilities in the field of laser material processing where CO2 and Nd:YAG lasers were used up to the present. The results obtained in some materials cladding based on cobalt and nickel alloys as additional materials is presented. The instrumental set-up used in these experiments are described.

    La posibilidad de disponer actualmente de láseres de diodos con una potencia de emisión óptica superior a 1 kW permite abordar un gran número de aplicaciones en el ámbito del procesado de materiales con láser, dominado tradicionalmente por los láseres de CO2 y Nd:YAG. En el presente trabajo, se muestra la aplicación de los láseres de diodos de alta potencia al recubrimiento de materiales metálicos con aleaciones de base cobalto y níquel. Se describen las características del sistema empleado y se muestran los resultados obtenidos.

  20. Difraction spectrometry by laser beams

    Directory of Open Access Journals (Sweden)

    Frías, M.

    1988-12-01

    Full Text Available The advances in laser technology have permitted the development of numerous applications, in particular diffraction spectrometry by laser beams for the determination of the distribution curve of the particle sizes of different materials; this permits one to obtain the distribution of particle size in both wet and dry materials. In the present paper a brief description of the technique and its principles is offered. The results obtained with different materials-limestone clay, gypsum, Portland cement and siliceous materials are given.

    Los avances en la tecnología laser han permitido el desarrollo de múltiples aplicaciones, en concreto la espectrometría de difracción de rayos laser para la determinación de la curva de distribución del tamaño de partícula de diferentes materiales, y que permite la obtención de la misma tanto en seco como en húmedo. En este trabajo se hace una descripción breve de la técnica y de sus fundamentos. Se presentan resultados con diferentes materiales: caliza, arcilla, yeso, cemento Portland y materiales silíceos.

  1. Nanowire Lasers

    Directory of Open Access Journals (Sweden)

    Couteau C.

    2015-05-01

    Full Text Available We review principles and trends in the use of semiconductor nanowires as gain media for stimulated emission and lasing. Semiconductor nanowires have recently been widely studied for use in integrated optoelectronic devices, such as light-emitting diodes (LEDs, solar cells, and transistors. Intensive research has also been conducted in the use of nanowires for subwavelength laser systems that take advantage of their quasione- dimensional (1D nature, flexibility in material choice and combination, and intrinsic optoelectronic properties. First, we provide an overview on using quasi-1D nanowire systems to realize subwavelength lasers with efficient, directional, and low-threshold emission. We then describe the state of the art for nanowire lasers in terms of materials, geometry, andwavelength tunability.Next,we present the basics of lasing in semiconductor nanowires, define the key parameters for stimulated emission, and introduce the properties of nanowires. We then review advanced nanowire laser designs from the literature. Finally, we present interesting perspectives for low-threshold nanoscale light sources and optical interconnects. We intend to illustrate the potential of nanolasers inmany applications, such as nanophotonic devices that integrate electronics and photonics for next-generation optoelectronic devices. For instance, these building blocks for nanoscale photonics can be used for data storage and biomedical applications when coupled to on-chip characterization tools. These nanoscale monochromatic laser light sources promise breakthroughs in nanophotonics, as they can operate at room temperature, can potentially be electrically driven, and can yield a better understanding of intrinsic nanomaterial properties and surface-state effects in lowdimensional semiconductor systems.

  2. De paseo con los Bourbaki

    Directory of Open Access Journals (Sweden)

    Miquel Escudero

    2012-04-01

    Full Text Available Setenta y siete años después de la fundación del grupo Bourbaki, procedemos a una reflexión que puede ser útil para los estudiantes que acaso no sepan de su existencia, ni tan siquiera los de matemáticas. Sería interesante conocer que a este grupo se le debe el signo del vacío como conjunto. Con todo lo discutible que sea el método Bourbaki en su reinterpretación de la matemática, no cabe duda de su importante repercusión hasta el punto de que ha marcado una época. Hay un antes y un después tras su irrupción, ningún matemático de primera fila de la segunda mitad del siglo XX fue ajeno a su influjo, para encabezarlo o para reprobarlo. Comenzaron como una juvenil extravagancia, pero repleta de conocimientos y con decidida voluntad de aprehender el rigor de forma exhaustiva.

  3. Food irradiation - pros and cons

    Energy Technology Data Exchange (ETDEWEB)

    1983-01-01

    The use of ionising radiation for food preservation is a much-disputed topic, both among experts and among consumers. Pros and cons of this issue were discussed in detail at the consumers' forum. Professor Dr. Johannes Friedrich Diehl, Director of the Institute for Biochemistry of the Food Research Centre, Karlsruhe, is a well-known supporter of the new method of food preservation; he sees advantages in the radiopreservation of food because, for example, losses due to inedibility are reduced, the danger of salmonellosis is decreased, just as the use of chemicals. He thinks this method to be without danger to health, shown by many years of experience. Opponents to food irradiation like Prof. Dr. Konrad Pfeilsticker, Professor for food science and food chemistry at the Bonn University deem the method to be unnecessary and raise the problem of qualitative changes caused in the food. In the course of the discussions, the pros and cons seemed to balance each other out.

  4. Tratamiento del paciente con artrosis

    Directory of Open Access Journals (Sweden)

    Francisco Vargas Negrín

    2014-01-01

    Full Text Available El manejo terapéutico del paciente con artrosis tiene como objetivo disminuir la sintomatología dolorosa e inflamatoria, mejorar la capacidad funcional del paciente y la aplicación de intervenciones terapéuticas eficaces y lo más seguras posibles. Un enfoque centrado en el paciente implica su participación activa en el diseño del plan terapéutico y en la toma de decisiones informadas oportunas en todas las etapas de la enfermedad. La educación terapéutica, la actividad física y el ejercicio terapéutico junto con el control de peso, en caso de sobrepeso u obesidad, constituyen el núcleo central del tratamiento. Los autocuidados individuales y por los familiares son fundamentales en el control del día a día del paciente. El uso de terapias físicas, ayudas técnicas (bastón, etc. y de fármacos tipo analgésicos simples, opioides y antiinflamatorios tiene evidencias demostradas en el control del dolor, mejora la funcionalidad y la calidad de vida del paciente y una clara recomendación de uso en el tratamiento de la artrosis. La cirugía conservadora y la de reemplazo articular se indican en los casos en los que no se logran los objetivos terapéuticos en casos concretos.

  5. Excimer Laser Technology

    CERN Document Server

    Basting, Dirk

    2005-01-01

    This comprehensive survey on Excimer Lasers investigates the current range of the technology, applications and devices of this commonly used laser source, as well as the future of new technologies, such as F2 laser technology. Additional chapters on optics, devices and laser systems complete this compact handbook. A must read for laser technology students, process application researchers, engineers or anyone interested in excimer laser technology. An effective and understandable introduction to the current and future status of excimer laser technology.

  6. RASGOS DE PERSONALIDAD EN PACIENTES CON OBESIDAD

    Directory of Open Access Journals (Sweden)

    Alejandra Bravo Del Toro

    2011-01-01

    Full Text Available El presente estudio analizó los rasgos de personalidad con mayor incidencia en una población mexicana con obesidad. Se distinguieron los rasgos que intervienen en el funcionamiento diario de los sujetos. La muestra estuvo conformada por 60 pacientes: 31 hombres y 29 mujeres, con edades de 30 a 40 años, casados, con nivel educativo básico y que acudían a consulta médica en un centro de diagnóstico clínico, con antecedentes de obesidad. Se utilizó el perfil-inventario de la personalidad de Gordon, según el cual se comprobó que los pacientes con obesidad tienden a mostrar rasgos de personalidad por debajo de la norma. Los análisis demostraron relaciones significativas entre la gente obesa y cada uno de los rasgos de personalidad con menor prevalencia que mide la escala.

  7. Laser Development for Laser Fusion Applications

    Science.gov (United States)

    1978-09-01

    SLL 80 676 copy 1 SAN D78-2306 Unlimited Release UC-21 aM* m ml 8 H Laser Development for Laser Fusion Applications Research Progress...Printed Copy $6.00; Microfiche $3.00 Accession Number: 3885 Publication Date: Dec 01,1978 Title: Laser Development for Laser Fusion Applications...Document: Archive, RRI, DEW Descriptors, Keywords: Laser Development Fusion Application Oscillator Amplifier Geometry Electron Beam Iodine Hydrogen

  8. Cons ICARUS, TIGER and Fascism

    Directory of Open Access Journals (Sweden)

    Janez Vrečko

    2010-12-01

    Full Text Available Like the scientists of their time, Russian artists in the 1920s considered gravity the central problem – a view which points to the close harmony between modern physics and the avant-garde. It was only with the constructivist movement that the Icarus revolution grasped the principles of the “mobile philosophy” (3.651 which was almost at the same time recognised by modern physics as well. The static view of the world became obsolete, space and time were no longer absolute values. It was necessary to transcend Euclidean geometry, shake off the political ʻshackles on one’s hands’ and surrender to Lisicki’s imaginary space, where “At 2000 metres in the air / there is no more perspective” (Integrals 276.  Kosovel’s Icarus project accorded with Tatlin’s, and both of them accorded with the quintessential aims of the constructivist movement. It is no accident that Kosovel wished to name one of his poetry collections The Dream of Icarus. Poems on the Icarus theme, such as “Cons Icarus”, “Evacuation of the Spirit”, “Eh, Hey”, “A Heart in Alcohol” etc. belong to the group of Kosovel’s conses which follow his “mobile philosophy” (3.650 and “letters growing into space” (Int. 282.  The question “Man, do you want up in the air?” (Int. 128 will remain a question until the moment when man is finally ready to transcend the existing boundary and dive “beyond”. Hence Kosovel’s clear-cut contrast between the “green windows of an illuminated / express on a viaduct”, which moves horizontally and is, like a water current, subject to the earth’s gravity, and “the spirit in space”, whose direction of motion is “the perpendicular of the spirit”, atectonicity. “The spirit burns in space”: fire is an element that knows vertical movement alone, the only one of the elements to outgrow and transcend the earth’s gravity, therefore it is associated with another mythological figure important for

  9. RILIS laser room HD

    CERN Multimedia

    2016-01-01

    Footage of the RILIS laser room at ISOLDE. The Resonance Ionization Laser Ion Source (RILIS) is a chemically selective ion source which relies on resonant excitation of atomic transitions using tunable laser radiation. This video shows you the laser table with the different lenses and optics as well as an overview of the RILIS laser setup. It also shows laser light with different colors and operation by the RILIS laser experts. The last part of the video shows you the laser path from the RILIS laser room into the ISOLDE GPS separator room where it enters the GPS separator magnet.

  10. RILIS laser room

    CERN Multimedia

    2016-01-01

    Footage of the RILIS laser room at ISOLDE. The Resonance Ionization Laser Ion Source (RILIS) is a chemically selective ion source which relies on resonant excitation of atomic transitions using tunable laser radiation. This video shows you the laser table with the different lenses and optics as well as an overview of the RILIS laser setup. It also shows laser light with different colors and operation by the RILIS laser experts. The last part of the video shows you the laser path from the RILIS laser room into the ISOLDE GPS separator room where it enters the GPS separator magnet.

  11. Mirrorless lasers

    Indian Academy of Sciences (India)

    Hema Ramachandran

    2002-02-01

    Experimental realization of mirrorless lasers in the last decade have resulted in hectic activity in this field, due to their novelty, simplicity and ruggedness and their great potential for application. In this article, I will review the various developments in this field in roughly chronological order, and discuss some possible applications of this exciting phenomenon, also termed as ‘random lasing’.

  12. Nanowire Lasers

    OpenAIRE

    Couteau C.; Larrue A.; Wilhelm C.; Soci C.

    2015-01-01

    We review principles and trends in the use of semiconductor nanowires as gain media for stimulated emission and lasing. Semiconductor nanowires have recently been widely studied for use in integrated optoelectronic devices, such as light-emitting diodes (LEDs), solar cells, and transistors. Intensive research has also been conducted in the use of nanowires for subwavelength laser systems that take advantage of their quasione- dimensional (1D) nature, fl...

  13. Un tema con muchas variaciones

    Directory of Open Access Journals (Sweden)

    Bárbara Kepowics Malinowska

    2003-01-01

    Full Text Available Se aborda el tema de ética y valores como uno de los ejes principales de la formación de la identidad de los futuros profesionistas. Se presentan los resultados de una investigación realizada con metodología cualitativa, para conocer la relación entre los valores explícitos en el proyecto universitario y los valores en los estudiantes al culminar su carrera en la Universidad. Entre las principales conclusiones, cabe destacar la heterogeneidad de los valores vividos a través de las prácticas curriculares, una discrepancia significativa entre ellos y los valores declarados en los proyectos y, por consecuencia, una diferencia entre los valores deseables y los asumidos como compromiso personal. Predomina la ética de la conveniencia y hay poca conciencia de la profesión, entendida como un servicio de calidad para la sociedad.

  14. Fare astronomia con piccoli telescopi

    CERN Document Server

    Gainer, Michael K

    2007-01-01

    Non sono necessariamente richiesti strumenti mastodontici per produrre risultati scientificamente validi nel campo dell’astronomia. Anche l’astrofilo dotato di un piccolo telescopio, con un diametro di soli 8-9 cm, può contribuire alla scienza del cielo realizzando utili osservazioni del Sole, della Luna, dei pianeti, delle comete, degli asteroidi, delle stelle doppie o variabili, delle nebulose e degli ammassi stellari. Il manuale di M.K. Gainer spiega quale sia la dotazione minima (un piccolo telescopio, un computer, una semplice fotocamera digitale), come utilizzarla, e quali siano le tecniche appropriate da adottare nelle osservazioni. Offre inoltre schemi per interpretare e ridurre i dati raccolti, nonché schede da compilare e da spedire ai centri di raccolta internazionali. Questo libro è il passaporto grazie al quale l’astrofilo può entrare a pieno titolo nel mondo affascinante della scienza astronomica.

  15. La atención a los padres con hijos con necesidades educativas especiales (NEE

    Directory of Open Access Journals (Sweden)

    Claudia María Pernas Pico

    2011-01-01

    Full Text Available Los padres que tienen hijos con necesidades educativas especiales (NEE necesitan al igual que sus hijos de la intervención del maestro de Audición y Lenguaje con el objetivo primordial de mejorar la comunicación y el lenguaje de los niños. Se pretende en este artículo dar un abanico de posibilidades de cómo se puede intervenir con los padres desde las escuelas: con largas horas de reuniones, con formación, con talleres, con actividades y juegos, con libretas viajeras, con pequeñas pautas, etc... Siempre desde la empatía y la profesionalidad que debe transmitir el maestro de Audición y Lenguaje. Cambiando la preocupación de los padres por su ocupación.

  16. Laser Research Lab

    Data.gov (United States)

    Federal Laboratory Consortium — The Laser Research lab is thecenter for the development of new laser sources, nonlinear optical materials, frequency conversion processes and laser-based sensors for...

  17. Laser therapy (image)

    Science.gov (United States)

    A laser is used for many medical purposes. Because the laser beam is so small and precise, it enables ... without injuring surrounding tissue. Some uses of the laser are retinal surgery, excision of lesions, and cauterization ...

  18. Laser-Driven Fusion.

    Science.gov (United States)

    Gibson, A. F.

    1980-01-01

    Discusses the present status and future prospects of laser-driven fusion. Current research (which is classified under three main headings: laser-matter interaction processes, compression, and laser development) is also presented. (HM)

  19. Lasers in medicine.

    Science.gov (United States)

    Viherkoski, E

    1990-01-01

    Since its discovery, the laser has been intensively investigated and used in medicine, first in ophthalmology then in ear, nose and throat surgery, gynaecology, neurosurgery etc. Development spans from the ruby and argon lasers in outpatient eye surgery to the carbon dioxide and Nd:YAG lasers in the operating theatres and further on to the PDT-dye lasers, excimer and solid state angioplasty lasers or flash lamp pumped "gallstone cracker" lasers. The CO2-Nd: YAG laser combination will be described as the state-of-art surgical laser. This simultaneous, coaxial and coherent combination laser offers a new possibility to cut and coagulate effectively at the same time. Operating times are shortened and bleeding volumes minimised. The CO2-Nd: YAG laser represents a new type of interaction between laser and tissue, laser enhanced tissue absorption, which will be described.

  20. Fabrication and investigation of laser heterostructures InGaAs P/GaAs and InGaAs P/In P with wave emission of 0.8 {mu} m and 1.3 {mu} m; Obtencion e investigacion de heteroestructuras laser InGaAsP/GaAs e InGaAsP/InP con emision de onda de 0.8 {mu} m y 1.3 {mu} m

    Energy Technology Data Exchange (ETDEWEB)

    Berishev, I.E.; Gorbatchev, A.Y.; Hernandez del Castillo, I.C.; Ortiz, M.I.; Rodriguez P, G.; Mishournyi, V.A. [Instituto de Investigacion en Comunicacion Optica, Universidad Autonoma de San Luis Potosi, S.L.P. (Mexico)

    1998-10-01

    The present work reports about the fabrication and investigation of InGaAs P/In P and InGaAs P/GaAs lasers heterostructure with wavelength of 1.3 and 0.8 {mu} m, respectively. We propose a method based on the concept of solubility to determine the distribution of the temperature in the oven along the graphite boat. That permits to know the temperature immediately in the interface between the liquid phase and the substrate. This procedure together with a series of measurement of X-ray diffraction and photoluminescence spectra allows to simplify the optimization of the composition of the layers forming the heterostructure. The modified growth technology method by liquid phase epitaxy is described in detail. Using a special construction of the graphite boat allows to growth the layers with the thickness down to 50 Armstrong. We did a comparative analysis of a laser double heterostructure and a separate confinement heterostructure, The best threshold current densities were 270 and 370 A/cm{sup 2} for the heterostructure with the wavelength of 0.8 and 1.3 {mu} m, accordingly. These magnitudes are comparable with the threshold current densities reported early in different articles for equivalent structures. (Author)

  1. Manejo del embarazo prolongado con conducta expectante

    OpenAIRE

    Corrales Gutiérrez, Alexis

    2008-01-01

    Estudio sobre el Manejo del Embarazo Prolongado con conducta expectante tiene como fundamental objetivo demostrar que con una práctica obstétrica menos invasiva, se pueden obtener buenos resultados perinatales. Se asiste a una cada vez mayor tendencia mundial a interrumpir el embarazo incluso en la semana 41, con lo que se plantea mejorar los resultados en lo que a morbimortalidad perinatal se refiere. El protocolo de asistencia establecido en la Maternidad “Mariana Grajales” de Santa Clara, ...

  2. The Laser Marketplace

    Science.gov (United States)

    Hitz, C. B.

    1986-11-01

    The total value of all lasers sold during 1986 in the non-Communist world will exceed US $600 million. This paper examines these sales and categorizes them according to application and according to type of laser. The results are presented both in terms of numbers of lasers sold, and in terms of the value of those lasers. The data are based on extensive interviews with laser manufacturers and laser users.

  3. Laser accidents: Being Prepared

    Energy Technology Data Exchange (ETDEWEB)

    Barat, K

    2003-01-24

    The goal of the Laser Safety Officer and any laser safety program is to prevent a laser accident from occurring, in particular an injury to a person's eyes. Most laser safety courses talk about laser accidents, causes, and types of injury. The purpose of this presentation is to present a plan for safety offices and users to follow in case of accident or injury from laser radiation.

  4. Gasdynamic lasers: an introduction

    Energy Technology Data Exchange (ETDEWEB)

    Anderson, J.D. Jr.

    1976-01-01

    The following topics are covered: elementary physics, thermodynamics and vibrational kinetics of the CO/sub 2/--N/sub 2/--H/sub 2/O or He gasdynamic laser, calculation of gasdynamic laser performance, comparison between theory and experiment, inversions behind normal shock waves, CO/sub 2/--N/sub 2/ gasdynamic lasers: state-of-the-art, the carbon monoxide gasdynamic laser, downstream mixing gasdynamic lasers, optical cavity considerations for gasdynamic lasers, aerodynamic windows, and diffusers. (MHR)

  5. Hologramas multipresenciales en 3D con Kinect

    OpenAIRE

    Sánchez Sanabria, José Miguel

    2012-01-01

    El dispositivo de Microsoft Kinect se utiliza normalmente para videojuegos (Xbox360) pero también se puede programar para darle una utilidad deseada según sus funciones. Esto se consigue con el SDK de Microsoft para Windows 7. El dispositivo permite reconocer por infrarrojos profundidad, formas, gestos y también dispone de unos micrófonos con los que reconoce el audio. Los Hologramas siempre han sido algo relacionado con la ciencia ficción desde sus inicios con Star Wars, pero ahora existe...

  6. Criptococosis gingival en un paciente con SIDA

    OpenAIRE

    Delgado-Azañero, Wilson A.; Facultad de Estomatología, Universidad Peruana Cayetano Heredia. Lima,; Meneses Rivadeneyra, Leopoldo; Facultad de Estomatología, Universidad Peruana Cayetano Heredia. Lima,; Gotuzzo Herencia, Eduardo; Instituto de Medicina Tropical “Alexander von Humboldt”. Universidad Peruana Cayetano Heredia. Lima,; Bustamante, Beatriz; Instituto de Medicina Tropical “Alexander von Humboldt”. Universidad Peruana Cayetano Heredia. Lima,

    2014-01-01

    La criptococosis es una infección micótica que afecta a personas con o sin inmunosupresión. Sepresenta principalmente como una infección pulmonar crónica. La mayoría de casos enmucosa oral han sido reportados en pacientes con SIDA que cursaban con la forma diseminadade la infección. Se presenta un paciente varón de 36 años con SIDA, cuyo diagnóstico decriptococosis se estableció por biopsias de las encías. El cuadro oral se caracterizó poragrandamientos gingivales del sector ántero superior e...

  7. Aprende Ajedrez con Rey - Parte 2

    OpenAIRE

    ESTÉVEZ MONTERO, RAÚL; Lloret Mauri, Jaime

    2016-01-01

    Es una pieza audiovisual creada con el objeto de atraer la atención de los niños de muy corta edad con el ajedrez y familiarizarlos con todas sus piezas y movimientos. Es una animación dirigida a un público infantil presentada por dibujos animados en 2D, en la que se ha intentado respetar en todo momento el argot de la comunidad ajedredística. En este video se presenta la segunda parte. Estévez Montero, R.; Lloret Mauri, J. (2016). Aprende Ajedrez con Rey - Parte 2. http://hdl.handle.net/1...

  8. Aprende Ajedrez con Rey - Parte 1

    OpenAIRE

    ESTÉVEZ MONTERO, RAÚL; Lloret Mauri, Jaime

    2016-01-01

    Es una pieza audiovisual creada con el objeto de atraer la atención de los niños de muy corta edad con el ajedrez y familiarizarlos con todas sus piezas y movimientos. Es una animación dirigida a un público infantil presentada por dibujos animados en 2D, en la que se ha intentado respetar en todo momento el argot de la comunidad ajedredística. En este video se presenta la primera parte. Estévez Montero, R.; Lloret Mauri, J. (2016). Aprende Ajedrez con Rey - Parte 1. http://hdl.handle.net/1...

  9. Semiconductor Laser Measurements Laboratory

    Data.gov (United States)

    Federal Laboratory Consortium — The Semiconductor Laser Measurements Laboratory is equipped to investigate and characterize the lasing properties of semiconductor diode lasers. Lasing features such...

  10. Laser biophotonics

    Science.gov (United States)

    Bashkatov, A. N.; Genina, E. A.; Priezzhev, A. V.; Tuchin, V. V.

    2016-06-01

    This issue of Quantum Electronics presents the papers that reflect the state-of-the-art of laser technologies used in biomedical studies and medical practice. Among the new technologies, one can note the methods of correlation and Doppler spectroscopy, as well as THz spectroscopy, in which biologically significant molecules are characterised by specific resonances. The latter topic is considered in the paper by Nazarov et al., where the dielectric function of aqueous solutions of glucose and albumin is studied using pulsed THz spectroscopy.

  11. Progress Toward a Monolithically Integrated Coherent Diode Laser Array.

    Science.gov (United States)

    1981-02-20

    B-i C. DBR AND ACTIVE-PASSIVE LASER FABRICATION PROCEDURE ............... C-I D. ELECTROCHEMICAL DEPOSITION OF OHMIC CONTACTS FOR DIODE... LASER FABRICATION PROCEDURE C.1 SAMPLE EXAMINATION 1. Etch sample in 1:1:8 A-B etch (A:B:H 20 mp) for 5 sec. 2. Photograph all four corners of sample to...GaAlAs waveguide att ,uation coeffi- cients; 1 6 the assumption that K remains the same for both DBRs simplifies con- siderably the actual DBR laser

  12. Research on ballistic missile laser SIMU error propagation mechanism

    Institute of Scientific and Technical Information of China (English)

    Wei Shihui; Xiao Longxu

    2008-01-01

    It is necessary that the laser inertial system is used to further improve the fire accuracy and quick reaction capability in the ballistic missile strapdown inertial navigation system. According to the guidance con-trolling method and the output and error model of ballistic missile laser SIMU, the mathematical model of error propagation mechanism is set up and any transfer environmental function of error coefficient that affects the fire accuracy is deduced. Also, the missile longitudinal/lateral impact point is calculated using MATLAB. These estab-lish the technical foundation for further researching the dispersion characteristics of impact point and reducing the laser guidance error.

  13. Bases tratadas con cemento, en California

    Directory of Open Access Journals (Sweden)

    Chinchilla, M.

    1962-05-01

    Full Text Available El uso de bases tratadas con cemento para autopistas se inició en el Estado de California en 1938, empleándose para carreteras con determinadas condiciones de tráfico. Inicialmente, se especificó el uso obligatorio de plantas mezcladoras para asegurar el debido control de las proporciones adecuadas.

  14. Obstacles to Laser Safety

    Energy Technology Data Exchange (ETDEWEB)

    Barat, K

    2005-04-25

    The growth of laser development & technology has been remarkable. Unfortunately, a number of traps or obstacles to laser safety have also developed with that growth. The goal of this article is to highlight those traps, in the hope that an aware laser user will avoid them. These traps have been the cause or contributing factor of many a preventable laser accident.

  15. Diode Pumped Fiber Laser.

    Science.gov (United States)

    1984-12-01

    FIBER LASERS I. Nd:YAG FIBER LASER FABRICATION .............. 5 A. FIBER GROWTH .......................... 5 B. FIBER PROCESSING 7...1.32 pm FIBER LASERS I. Nd:YAG FIBER LASER FABRICATION A. FIBER GROWTH The single crystal fibers used in this work were grown at Stanford University

  16. Lasers in cosmetic dentistry.

    Science.gov (United States)

    Pang, Peter

    2008-01-01

    Lasers have become a necessary instrument in the esthetic restorative armamentarium. This article presents smile design guidelines for soft tissue lasers, as well as an overview of hard tissue procedures that may be performed using all-tissue lasers. The goal is to help dentists determine the appropriate laser for a given clinical situations.

  17. Visible Solid State Lasers

    NARCIS (Netherlands)

    Hikmet, R.A.M.

    2007-01-01

    Diode lasers can be found in various applications most notably in optical communication and optical storage. Visible lasers were until recently were all based on IR diode lasers. Using GaN, directly blue and violet emitting lasers have also been introduced to the market mainly in the area of optical

  18. Applications of Semiconductor Lasers

    Institute of Scientific and Technical Information of China (English)

    LI Te; SUN Yan-fang; NING Yong-qiang; WANG Li-jun

    2005-01-01

    An overview of the applications of semiconductor lasers is presented. Diode lasers are widely used today,and the most prevalent use of the laser is probably in CD and DVD drives for computers and audio/video media systems. Semiconductor lasers are also used in many other fields ranging from optical fiber communications to display,medicine and pumping sources.

  19. New laser materials for laser diode pumping

    Science.gov (United States)

    Jenssen, H. P.

    1990-01-01

    The potential advantages of laser diode pumped solid state lasers are many with high overall efficiency being the most important. In order to realize these advantages, the solid state laser material needs to be optimized for diode laser pumping and for the particular application. In the case of the Nd laser, materials with a longer upper level radiative lifetime are desirable. This is because the laser diode is fundamentally a cw source, and to obtain high energy storage, a long integration time is necessary. Fluoride crystals are investigated as host materials for the Nd laser and also for IR laser transitions in other rare earths, such as the 2 micron Ho laser and the 3 micron Er laser. The approach is to investigate both known crystals, such as BaY2F8, as well as new crystals such as NaYF8. Emphasis is on the growth and spectroscopy of BaY2F8. These two efforts are parallel efforts. The growth effort is aimed at establishing conditions for obtaining large, high quality boules for laser samples. This requires numerous experimental growth runs; however, from these runs, samples suitable for spectroscopy become available.

  20. Multibeam fiber laser cutting

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove; Hansen, Klaus Schütt; Nielsen, Jakob Skov

    2009-01-01

    The appearance of the high power high brilliance fiber laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating Cutting laser, the CO2 laser. However, quality problems in fiber-laser...... cutting have until now limited its application to metal cutting. In this paper the first results of proof-of-principle Studies applying a new approach (patent pending) for laser cutting with high brightness and short wavelength lasers will be presented. In the approach, multibeam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from two single mode fiber lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W...

  1. Multibeam Fibre Laser Cutting

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove

    The appearance of the high power high brilliance fibre laser has opened for new possibilities in laser materials processing. In laser cutting this laser has demonstrated high cutting performance compared to the dominating cutting laser, the CO2-laser. However, quality problems in fibre-laser...... cutting have until now limited its application in metal cutting. In this paper the first results of proof-of-principle studies applying a new approach (patent pending) for laser cutting with high brightness short wavelength lasers will be presented. In the approach, multi beam patterns are applied...... to control the melt flow out of the cut kerf resulting in improved cut quality in metal cutting. The beam patterns in this study are created by splitting up beams from 2 single mode fibre lasers and combining these beams into a pattern in the cut kerf. The results are obtained with a total of 550 W of single...

  2. High power fiber lasers

    Institute of Scientific and Technical Information of China (English)

    LOU Qi-hong; ZHOU Jun

    2007-01-01

    In this review article, the development of the double cladding optical fiber for high power fiber lasers is reviewed. The main technology for high power fiber lasers, including laser diode beam shaping, fiber laser pumping techniques, and amplification systems, are discussed in de-tail. 1050 W CW output and 133 W pulsed output are ob-tained in Shanghai Institute of Optics and Fine Mechanics, China. Finally, the applications of fiber lasers in industry are also reviewed.

  3. Laser Hardening of Metals

    Institute of Scientific and Technical Information of China (English)

    Institute for Laser Physics; V.A.Serebryakov; K.V.Gratzianov; A.S.Eremenko; A.A.Timopheev; SPBSUITMO; M.V.Volkov

    2006-01-01

    Results of experiments on laser hardening of various materials with intensity 109~1010W/cm2 are represented. Nd:glass laser with energy up to 45J with a pulse duration ~30ns was used as a source of ra diation. Comparative researches of the laser peening for the various target areas are fulfilled. Results of laser hardening were determined by the microstructure analysis. The new approach to creation of the industrial laser for peening is discussed.

  4. The laser in urology

    Science.gov (United States)

    Hofstetter, Alfons G.

    2002-10-01

    Laser is an acronym for a physical principle and means: Light Amplification by stimulated Emission of Radiation. This principle offers a lot of tissue/light effects caused by the parameters: power density/time and the special qualities of the laser light. Nowadays for diagnosis and therapy following lasers are used in urology: Krypton- and Dye-lasers as well as the Neodymium-YAG- (nd:YAG-), Holmium-YAG (Ho:YAG-), Diode-, Argon- and the CO2-lasers.

  5. Laser ablation principles and applications

    CERN Document Server

    1994-01-01

    Laser Ablation provides a broad picture of the current understanding of laser ablation and its many applications, from the views of key contributors to the field. Discussed are in detail the electronic processes in laser ablation of semiconductors and insulators, the post-ionization of laser-desorbed biomolecules, Fourier-transform mass spectroscopy, the interaction of laser radiation with organic polymers, laser ablation and optical surface damage, laser desorption/ablation with laser detection, and laser ablation of superconducting thin films.

  6. Materiales compuestos reforzados con estructuras MULTIAXIALES

    OpenAIRE

    Capdevila Juan, Francisco Javier; Ardanuy Raso, Mònica

    2011-01-01

    La combinación de los elementos estructurales de los tejidos de calada y los tejidos de malla conduce a una estructura híbrida. Esta estructura, que pueden incorporar varios hilos de trama o a la que se le puede insertar una tela no tejida, se denomina multiaxial. La combinación de las estructuras multiaxiales con resinas poliméricas permite obtener materiales compuestos con propiedades específicas y distintas a las de sus componentes - fibras y polímeros - para aplicaciones novedosas. Con es...

  7. El envejecimiento de las personas con discapacidad

    OpenAIRE

    Envejecimiento Activo, CERMI

    2012-01-01

    El envejecimiento activo es considerado como un concepto multidimensional que abarca y supera la buena salud, resultado de un amplio conjunto de factores biológicos, psicológicos y sociales. En el caso de las personas mayores con discapacidad, la ausencia de una política de promoción y sensibilización en la comunidad a veces les niega la igualdad de oportunidades en relación con el resto de los ciudadanos. Para desarrollar ese potencial de envejecimiento activo en personas con discapacidad ha...

  8. Enfermedad coronaria en pacientes con psoriasis

    OpenAIRE

    Walter Masson; María L. Galimberti; Carolina L. Anselmi; Arturo Cagide; Ricardo L. Galimberti

    2013-01-01

    Comunicaciones previas asociaron la psoriasis con la enfermedad coronaria. Desconocemos si en nuestro país o región existe dicha asociación. Se realizó un estudio transversal analizando los datos de la historia clínica electrónica de un sistema de salud de Buenos Aires. Analizamos todos los pacientes mayores de 18 años con diagnóstico de psoriasis entre el 1 de enero de 2003 y el 31 de julio de 2011 y los comparamos con un grupo control, en una relación 2:1, obtenido en forma aleatoria del mi...

  9. Entornos adaptados para personas con discapacidad mental

    OpenAIRE

    Guasch Murillo, Daniel; Bonasa Jiménez, Mª del Pilar; López Novella, Judit; Mayor Sánchez, Carolina; Guasch Murillo, Yolanda

    2001-01-01

    Las universidades tienen ante sí un reto importante en conseguir entornos accesibles para el alumnado con discapacidad mental donde puedan desarrollar con éxito sus estudios universitarios y, de esta forma, mejorar sus perspectivas laborales. Sólo el 5,4% de las personas con discapacidad de 25 o más años tienen estudios universitarios o equivalentes, siendo este porcentaje del 18,7% en el caso de las personas sin discapacidad (Observatorio Estatal de la Discapacidad, 2010). Si se observa el p...

  10. Tratamiento conservador en pacientes con retinoblastoma bilateral

    Directory of Open Access Journals (Sweden)

    Juan C. Suárez

    2008-11-01

    Full Text Available OBJETIVO: comparar el tratamiento convencional del retinoblastoma bilateral, usado hasta hace algunos años, consistente en radioterapia o enucleación bilateral, con el tratamiento conservador actual que incluye termoterapia transpupilar (TTT o TTT/quimioterapia al menos en un ojo, en niños con diagnóstico de retinoblastoma bilateral. DISEÑO: estudio retrospectivo descriptivo. MUESTRA: 20 pacientes con diagnóstico de retinoblastoma bilateral que consultaron al Hospital Universitario San Vicente de Paúl, de Medellín, Colombia, entre 1997 y 2007. MÉTODO: se hizo enucleación del ojo con el tumor de mayor tamaño. En el otro ojo se hizo tratamiento con TTT, con el láser diodo (810 nm, spot amplio, solo o combinado con otras terapias. RESULTADOS: se dividió a los pacientes en dos grupos: 16 pacientes (32 ojos en el grupo 1 tratados conservadoramente y 4 pacientes (8 ojos en el grupo 2 con tratamiento convencional. El rango de edad fue de 1-72 meses en el grupo 1 y de 1-12 meses en el grupo 2. El tiempo de seguimiento fue de 7-67 meses para el grupo 1 y de 13-73 meses para el grupo 2. En el grupo 1 se hizo enucleación de 16 ojos (50%, radioterapia externa de uno (3,1%, quimioterapia más termoterapia de 5 (15,6% y quimioterapia más termoterapia más crioterapia de 10 (31,3%. En todos los pacientes se logró preservar al menos un ojo. En el grupo 2, se enuclearon 7 ojos (87,5% y se hizo radioterapia externa más enucleación en un paciente (12.5%. Además, todos los pacientes recibieron quimioterapia. CONCLUSIÓN: la terapia conservadora actual consistente en tratamiento local (termoterapia, crioterapia o braquiterapia y quimiorreducción permite preservar al menos un ojo y en algunos casos de los dos, muchas veces con buena agudeza visual, en niños con retinoblastoma bilateral; se evitan así la enucleación bilateral y la radioterapia externa usada en el tratamiento convencional con todos sus efectos secundarios. La enucleación contin

  11. Paternidad: niños con discapacidad

    OpenAIRE

    Patricia Ortega Silva; Laura Evelia Torres Velázquez; Adriana Reyes Luna; Adriana Garrido Garduño

    2010-01-01

    La paternidad no sólo es un compromiso, una responsabilidad, algo que resulte difícil de realizar, sino que incluye, además, momentos de recreación, convivencia con el otro, expresión de sentimientos, etcétera, que llevan a establecer relaciones donde se va construyendo y reconstruyendo la identidad como persona tanto para el hombre como para el hijo o hija. En familias con hijos o hijas con discapacidad, se crea una fuerte tensión entre el ser y el deber ser; el varón empieza a cuestionarse ...

  12. Posicionamiento WIFI con variaciones de fingerprint

    OpenAIRE

    Kornuta, Carlos; Acosta, Nelson; Toloza, Juan Manuel

    2013-01-01

    Los sistemas de posicionamiento Indoor estiman la posición de un dispositivo móvil en un entorno cerrado con una precisión relativa. Existen diversas técnicas de posicionamiento, donde el parámetro mayormente utilizado es el RSSI (Received Signal Strength Indicator). En este artículo se analiza la técnica Fingerprint con la finalidad de estimar el margen de error obtenido con la distancia euclidiana como métrica principal. Se presentan variantes de la construcción de la base de datos Fingerpr...

  13. Hiperalgesia asociada al tratamiento con opioides

    OpenAIRE

    Gil Martín, A.; M. Moreno García; J. Sánchez-Rubio Ferrández; T. Molina García

    2014-01-01

    La hiperalgesia inducida por opioides es una reacción paradójica caracterizada por una percepción intensificada de dolor relacionada con el uso de estos medicamentos en ausencia de progresión de la enfermedad o de síndrome de retirada. A diferencia de los casos de tolerancia, definida como pérdida de potencia analgésica durante el uso prolongado de opioides, no se produce mejoría con el escalado de dosis. La hiperalgesia inducida por opioides se ha manifestado en pacientes con dosis de manten...

  14. Ceramic Laser Materials

    Directory of Open Access Journals (Sweden)

    Guillermo Villalobos

    2012-02-01

    Full Text Available Ceramic laser materials have come a long way since the first demonstration of lasing in 1964. Improvements in powder synthesis and ceramic sintering as well as novel ideas have led to notable achievements. These include the first Nd:yttrium aluminum garnet (YAG ceramic laser in 1995, breaking the 1 KW mark in 2002 and then the remarkable demonstration of more than 100 KW output power from a YAG ceramic laser system in 2009. Additional developments have included highly doped microchip lasers, ultrashort pulse lasers, novel materials such as sesquioxides, fluoride ceramic lasers, selenide ceramic lasers in the 2 to 3 μm region, composite ceramic lasers for better thermal management, and single crystal lasers derived from polycrystalline ceramics. This paper highlights some of these notable achievements.

  15. Laser-surface interactions

    CERN Document Server

    Ganeev, Rashid A

    2014-01-01

    This book is about the interaction of laser radiation with various surfaces at variable parameters of radiation. As a basic principle of classification we chose the energetic or intensity level of interaction of laser radiation with the surfaces. These two characteristics of laser radiation are the most important parameters defining entire spectrum of the processes occurring on the surfaces during interaction with electromagnetic waves. This is a first book containing a whole spectrum of the laser-surface interactions distinguished by the ranges of used laser intensity. It combines the surface response starting from extremely weak laser intensities (~1 W cm-2) up to the relativistic intensities (~1020 W cm-2 and higher). The book provides the basic information about lasers and acquaints the reader with both common applications of laser-surface interactions (laser-related printers, scanners, barcode readers, discs, material processing, military, holography, medicine, etc) and unusual uses of the processes on t...

  16. John Ashbery: encuentro con los pintores

    OpenAIRE

    Power, K

    2009-01-01

    Este texto, basado en la ponencia presentada en el Seminario Permanente de Investigación de la Cátedra Félix Huarte dedicado a "Autorretrato en espejo convexo", propone un recorrido por el diálogo de Ashbery con la pintura: su primera etapa como crítico de arte en París y su relación con los pintores del expresionismo abstracto norteamericano.

  17. Vicente del Bosque: el carisma con mesura

    Directory of Open Access Journals (Sweden)

    Antonio Sánchez Pato

    2013-01-01

    Full Text Available La vida del seleccionador español de fútbol, D. Vicente del Bosque, constituye un ejemplo de dedicación al deporte rey. En este ensayo haremos una alabanza de los principales méritos deportivos, docentes y personales que atesora, con el objetivo de servir de laudatio1 con motivo de su investidura como doctor honoris causa por la Universidad Católica San Antonio de Murcia.

  18. Últimas tardes con Teresa

    Directory of Open Access Journals (Sweden)

    Hugo Ruiz Rojas

    1966-08-01

    Full Text Available Ultimas tardes con Teresa, del escritor español Juan Marsé, viene a llamar la atención sobre este joven autor, que ya en sus libros anteriores, Esta cara de la luna y Encerrados con un solo juguete, había demostrado claras dotes de novelista, puesto que no solo tenía algo que decir sino que sabía también cómo decirlo.

  19. Infactibilidad en programas con restricciones lineales

    Directory of Open Access Journals (Sweden)

    Liern Carrión, V.

    1999-01-01

    Full Text Available En este trabajo resumimos las técnicas más habituales que permiten diagnosticar las causas de infactibilidad de programas con restricciones lineales. Además, presentamos dos métodos que, con las mínimas transformaciones posibles del modelo inicial, permiten hacer viable un programa infactible. Los métodos descritos son aplicados a un modelo de selección de carteras eficientes.

  20. Presa con revestimiento asfáltico

    Directory of Open Access Journals (Sweden)

    Proudfit, D. P.

    1960-07-01

    Full Text Available La presa denominada Montgomery se halla situada sobre el río South Platte River, a unos 8 km aguas arriba de la ciudad de Alma, del Estado de Colorado (EE. UU., y en la ladera oriental de la cordillera Continental Divide. El cuerpo o dique de esta presa está constituido por piedra, revestida con una capa de hormigón asfáltico en el paramento de contacto con el agua.

  1. Controlling Chaotic Lasers

    Science.gov (United States)

    Gills, Zelda; Roy, Rajarshi

    1995-01-01

    Irregular fluctuations in intensity have long plagued the operation of a wide variety of solid-state lasers. We are exploring the possibility of exploiting rather than avoiding a laser's chaotic output. As an important step in that direction, we have applied a novel control technique to stabilize a solid state laser. By making small periodic changes in only one input parameter of the laser, we are able to stabilize complex periodic waveforms and steady state behavior in the laser output. We demonstrate the application of this approach in a diode pumped Nd:/YAG laser system.

  2. Lasers in periodontics.

    Science.gov (United States)

    Elavarasu, Sugumari; Naveen, Devisree; Thangavelu, Arthiie

    2012-08-01

    Laser is one of the most captivating technologies in dental practice since Theodore Maiman in 1960 invented the ruby laser. Lasers in dentistry have revolutionized several areas of treatment in the last three and a half decades of the 20(th) century. Introduced as an alternative to mechanical cutting device, laser has now become an instrument of choice in many dental applications. Evidence suggests its use in initial periodontal therapy, surgery, and more recently, its utility in salvaging implant opens up a wide range of applications. More research with better designs are a necessity before lasers can become a part of dental armamentarium. This paper gives an insight to laser in periodontics.

  3. Búsqueda de prensiones con force-closure de objetos 2D articulados con 2 eslabones

    OpenAIRE

    Alvarado Tovar, Noé; Suárez Feijóo, Raúl

    2013-01-01

    Este trabajo propone un procedimiento por medio del cual se puede encontrar una prensión localmente óptima en objetos articulados 2D con 2 eslabones y considerando contactos sin fricción.La superficie de cada eslabón del objeto se representa con un conjunto finito de puntos. El enfoque propuesto encuentra en primer lugar una prensión inicial con force-closure. La medida de calidad considerada en este trabajo es el vector de fuerzas generalizadas mayor que una prensión puede resistir con indep...

  4. Terapia familiar estructuralista aplicada a una familia con un hijo con autismo

    OpenAIRE

    2015-01-01

    El presente trabajo abarca dos temas importantes, la terapia estructuralista familiar en una familia con un hijo diagnosticado con Autismo. El autismo es un trastorno con características multifactoriales que si bien no tiene cura, afecta no solo al enfermo sino a la familia, este se presenta como una vivencia de duelo para la familia. Se trabaja con la terapia estructuralista familiar para lograr cambios dentro de la familia que permitan un mejor desarrollo en el niño a nivel personal y socia...

  5. Higiene postural relacionado con la integración de alumnos con necesidades educativas especiales

    OpenAIRE

    Martín Rodríguez, Cristina

    2014-01-01

    A lo largo de este trabajo pretendemos demostrar la importancia de la prevención e higiene postural para el mantenimiento de la salud de la comunidad educativa, con el objetivo de crear escuelas saludables. Hemos querido relacionar este tema con la inclusión e integración escolar de los alumnos con necesidades educativas especiales, partiendo de las inquietudes del resto del alumnado por el mobiliario adaptado y utilizado por los alumnos con discapacidad motórica. En primer ...

  6. Mincle Signaling Promotes Con A Hepatitis.

    Science.gov (United States)

    Greco, Stephanie H; Torres-Hernandez, Alejandro; Kalabin, Aleksandr; Whiteman, Clint; Rokosh, Rae; Ravirala, Sushma; Ochi, Atsuo; Gutierrez, Johana; Salyana, Muhammad Atif; Mani, Vishnu R; Nagaraj, Savitha V; Deutsch, Michael; Seifert, Lena; Daley, Donnele; Barilla, Rocky; Hundeyin, Mautin; Nikifrov, Yuriy; Tejada, Karla; Gelb, Bruce E; Katz, Steven C; Miller, George

    2016-10-01

    Con A hepatitis is regarded as a T cell-mediated model of acute liver injury. Mincle is a C-type lectin receptor that is critical in the immune response to mycobacteria and fungi but does not have a well-defined role in preclinical models of non-pathogen-mediated inflammation. Because Mincle can ligate the cell death ligand SAP130, we postulated that Mincle signaling drives intrahepatic inflammation and liver injury in Con A hepatitis. Acute liver injury was assessed in the murine Con A hepatitis model using C57BL/6, Mincle(-/-), and Dectin-1(-/-) mice. The role of C/EBPβ and hypoxia-inducible factor-1α (HIF-1α) signaling was assessed using selective inhibitors. We found that Mincle was highly expressed in hepatic innate inflammatory cells and endothelial cells in both mice and humans. Furthermore, sterile Mincle ligands and Mincle signaling intermediates were increased in the murine liver in Con A hepatitis. Most significantly, Mincle deletion or blockade protected against Con A hepatitis, whereas Mincle ligation exacerbated disease. Bone marrow chimeric and adoptive transfer experiments suggested that Mincle signaling in infiltrating myeloid cells dictates disease phenotype. Conversely, signaling via other C-type lectin receptors did not alter disease course. Mechanistically, we found that Mincle blockade decreased the NF-κβ-related signaling intermediates C/EBPβ and HIF-1α, both of which are necessary in macrophage-mediated inflammatory responses. Accordingly, Mincle deletion lowered production of nitrites in Con A hepatitis and inhibition of both C/EBPβ and HIF-1α reduced the severity of liver disease. Our work implicates a novel innate immune driver of Con A hepatitis and, more broadly, suggests a potential role for Mincle in diseases governed by sterile inflammation.

  7. Enfermedad coronaria en pacientes con psoriasis

    Directory of Open Access Journals (Sweden)

    Walter Masson

    2013-10-01

    Full Text Available Comunicaciones previas asociaron la psoriasis con la enfermedad coronaria. Desconocemos si en nuestro país o región existe dicha asociación. Se realizó un estudio transversal analizando los datos de la historia clínica electrónica de un sistema de salud de Buenos Aires. Analizamos todos los pacientes mayores de 18 años con diagnóstico de psoriasis entre el 1 de enero de 2003 y el 31 de julio de 2011 y los comparamos con un grupo control, en una relación 2:1, obtenido en forma aleatoria del mismo sistema de salud, apareados por edad y sexo. Determinamos la prevalencia de los factores de riesgo cardiovascular y de enfermedad coronaria. Analizamos la asociación entre la enfermedad coronaria y la psoriasis mediante análisis uni y multivariado. Se incluyeron 3 833 sujetos (1 286 pacientes con psoriasis y 2 547 controles. La prevalencia de hipertensión arterial (50% vs. 38%, p < 0.001, tabaquismo (25% vs. 17%, p < 0.001, diabetes (12% vs. 8%, p < 0.001 y enfermedad coronaria (4.98% vs. 3.06%, p = 0.003 fue mayor en los sujetos con psoriasis en comparación con el grupo control. Independientemente de la edad, la presencia de diabetes, hipertensión arterial o tabaquismo, hubo una asociación significativa entre la enfermedad coronaria y la psoriasis (OR 1.48, IC95% 1.04-2.11, p = 0.03. En conclusión, en esta población de Buenos Aires, los pacientes con psoriasis tuvieron una mayor prevalencia de diabetes, hipertensión arterial, tabaquismo y enfermedad coronaria. La asociación entre la psoriasis y la enfermedad coronaria fue independiente de los factores de riesgo explorados.

  8. Photonic bandgap fiber lasers and multicore fiber lasers for next generation high power lasers

    DEFF Research Database (Denmark)

    Shirakawa, A.; Chen, M.; Suzuki, Y.

    2014-01-01

    Photonic bandgap fiber lasers are realizing new laser spectra and nonlinearity mitigation that a conventional fiber laser cannot. Multicore fiber lasers are a promising tool for power scaling by coherent beam combination. © 2014 OSA....

  9. Laser Processing and Chemistry

    CERN Document Server

    Bäuerle, Dieter

    2011-01-01

    This book gives an overview of the fundamentals and applications of laser-matter interactions, in particular with regard to laser material processing. Special attention is given to laser-induced physical and chemical processes at gas-solid, liquid-solid, and solid-solid interfaces. Starting with the background physics, the book proceeds to examine applications of lasers in “standard” laser machining and laser chemical processing (LCP), including the patterning, coating, and modification of material surfaces. This fourth edition has been enlarged to cover the rapid advances in the understanding of the dynamics of materials under the action of ultrashort laser pulses, and to include a number of new topics, in particular the increasing importance of lasers in various different fields of surface functionalizations and nanotechnology. In two additional chapters, recent developments in biotechnology, medicine, art conservation and restoration are summarized. Graduate students, physicists, chemists, engineers, a...

  10. Laser in operative dentistry

    Directory of Open Access Journals (Sweden)

    E. Yasini

    1994-06-01

    Full Text Available Today laser has a lot of usage in medicine and dentistry. In the field of dentistry, laser is used in soft tissue surgery, sterilization of canals (in root canal therapy and in restorative dentistry laser is used for cavity preparation, caries removal, sealing the grooves (in preventive dentistry, etching enamel and dentin, composite polymerization and removal of tooth sensitivity. The use of Co2 lasers and Nd: YAG for cavity preparation, due to creating high heat causes darkness and cracks around the region of laser radiation. Also due to high temperature of these lasers, pulp damage is inevitable. So today, by using the Excimer laser especially the argon floride type with a wavelength of 193 nm, the problem of heat stress have been solved, but the use of lasers in dentistry, especially for cavity preparation needs more researches and evaluations.

  11. Transmyocardial Laser Revascularization

    Science.gov (United States)

    ... Vascular Access for Hemodialysis Ventricular Assist Devices Transmyocardial Laser Revascularization Like every other organ or tissue in ... bypass surgery, there is a procedure called transmyocardial laser revascularization, also called TMLR or TMR. TMLR cannot ...

  12. Wavelength sweepable laser source

    DEFF Research Database (Denmark)

    2014-01-01

    Wavelength sweepable laser source is disclosed, wherein the laser source is a semiconductor laser source adapted for generating laser light at a lasing wavelength. The laser source comprises a substrate, a first reflector, and a second reflector. The first and second reflector together defines...... and having a rest position, the second reflector and suspension together defining a microelectromechanical MEMS oscillator. The MEMS oscillator has a resonance frequency and is adapted for oscillating the second reflector on either side of the rest position.; The laser source further comprises electrical...... connections adapted for applying an electric field to the MEMS oscillator. Furthermore, a laser source system and a method of use of the laser source are disclosed....

  13. Laser surgery - skin

    Science.gov (United States)

    Surgery using a laser ... used is directly related to the type of surgery being performed and the color of the tissue ... Laser surgery can be used to: Close small blood vessels to reduce blood loss Remove warts , moles , sunspots, and ...

  14. LASIK - Laser Eye Surgery

    Science.gov (United States)

    ... Uveitis Focus On Pediatric Ophthalmology Education Center Oculofacial Plastic Surgery Center Laser Surgery Education Center Redmond Ethics Center ... Uveitis Focus On Pediatric Ophthalmology Education Center Oculofacial Plastic Surgery Center Laser Surgery Education Center Redmond Ethics Center ...

  15. Silicon superficial texturing bypulsed laser

    Directory of Open Access Journals (Sweden)

    Ponce, L.

    1998-04-01

    Full Text Available Texturing of silicon surfaces with pulsed laser is made. The method is based on the formation of laser- induced periodic surface structure (LIPSS. The process is temporary characterized through the dynamic reflectance, thus determining the formation threshold of the structure. Relation between the different textures and the spectral reflectance of the samples before and after the treatment is also characterized. The mean value of spectral reflectance decreases up to a 6 %.

    Se realiza el texturado de superficies de silicio con un láser pulsado mediante la formación de una estructura periódica inducida por láser (LIPSS. Se caracteriza el proceso mediante reflectancia dinámica, determinándose el umbral de formación de la estructura. Se caracteriza el nivel de texturado midiendo la reflectancia espectral de las muestras antes y después del tratamiento. El valor medio de la reflectancia espectral disminuye hasta el 6 %.

  16. Laser removal of tattoos.

    Science.gov (United States)

    Kuperman-Beade, M; Levine, V J; Ashinoff, R

    2001-01-01

    Tattoos are placed for different reasons. A technique for tattoo removal which produces selective removal of each tattoo pigment, with minimal risk of scarring, is needed. Nonspecific methods have a high incidence of scarring, textural, and pigmentary alterations compared with the use of Q-switched lasers. With new advances in Q-switched laser technology, tattoo removal can be achieved with minimal risk of scarring and permanent pigmentary alteration. There are five types of tattoos: amateur, professional, cosmetic, medicinal, and traumatic. Amateur tattoos require less treatment sessions than professional multicolored tattoos. Other factors to consider when evaluating tattoos for removal are: location, age and the skin type of the patient. Treatment should begin by obtaining a pre-operative history. Since treatment with the Q-switched lasers is painful, use of a local injection with lidocaine or topical anaesthesia cream may be used prior to laser treatment. Topical broad-spectrum antibacterial ointment is applied immediately following the procedure. Three types of lasers are currently used for tattoo removal: Q-switched ruby laser (694 nm), Q-switched Nd:YAG laser (532 nm, 1064 nm), and Q-switched alexandrite laser (755 nm). The Q-switched ruby and alexandrite lasers are useful for removing black, blue and green pigments. The Q-switched 532 nm Nd:YAG laser can be used to remove red pigments and the 1064 nm Nd:YAG laser is used for removal of black and blue pigments. The most common adverse effects following laser tattoo treatment with the Q-switched ruby laser include textural change, scarring, and pigmentary alteration. Transient hypopigmentation and textural changes have been reported in up to 50 and 12%, respectively, of patients treated with the Q-switched alexandrite laser. Hyperpigmentation and textural changes are infrequent adverse effects of the Q-switched Nd:YAG laser and the incidence of hypopigmentary changes is much lower than with the ruby laser

  17. CO2 laser modeling

    Science.gov (United States)

    Johnson, Barry

    1992-01-01

    The topics covered include the following: (1) CO2 laser kinetics modeling; (2) gas lifetimes in pulsed CO2 lasers; (3) frequency chirp and laser pulse spectral analysis; (4) LAWS A' Design Study; and (5) discharge circuit components for LAWS. The appendices include LAWS Memos, computer modeling of pulsed CO2 lasers for lidar applications, discharge circuit considerations for pulsed CO2 lidars, and presentation made at the Code RC Review.

  18. Laser cutting system

    Science.gov (United States)

    Dougherty, Thomas J

    2015-03-03

    A workpiece cutting apparatus includes a laser source, a first suction system, and a first finger configured to guide a workpiece as it moves past the laser source. The first finger includes a first end provided adjacent a point where a laser from the laser source cuts the workpiece, and the first end of the first finger includes an aperture in fluid communication with the first suction system.

  19. Tunable laser optics

    CERN Document Server

    Duarte, FJ

    2015-01-01

    This Second Edition of a bestselling book describes the optics and optical principles needed to build lasers. It also highlights the optics instrumentation necessary to characterize laser emissions and focuses on laser-based optical instrumentation. The book emphasizes practical and utilitarian aspects of relevant optics including the essential theory. This revised, expanded, and improved edition contains new material on tunable lasers and discusses relevant topics in quantum optics.

  20. Application of Various Lasers to Laser Trimming Resistance System

    Institute of Scientific and Technical Information of China (English)

    SUN Ji-feng

    2007-01-01

    Though the laser trimming resistance has been an old laser machining industry for over 30 years, the development of technology brings new alternative lasers which can be used for the traditional machining. The paper describes application of various lasers to laser trimming resistance system including early traditional krypton arc lamp pumped Nd:YAG to laser, modern popular diode pumped solid state laser and the present advanced harmonic diode pumped solid state laser. Using the new alternative lasers in the laser trimming resistance system can dramatically improve the yields and equipment performance.

  1. Variables socionutricionales de hogares mazahuas integrados por preescolares desnutridos con madres con obesidad y sin obesidad

    Directory of Open Access Journals (Sweden)

    Conzuelo González, Viridiana Vanessa

    2009-01-01

    Full Text Available El primer objetivo fue conocer cuántos menores de cinco años con diferentes grados de desnutrición tienen una madre con sobrepeso/obesidad/ en una comunidad indígena que vive en extrema pobreza y bajo condiciones de migración masculina internacional. El segundo fue comparar tres variables socionutricionales (ingreso familiar, educación de la madre y adecuación nutrimental de la dieta diaria entre estos hogares y los hogares con desnutrición infantil y madres sin obesidad. Se realizó un estudio transversal (2006-2007, en la comunidad mazahua de San Francisco Tepeolulco, Municipio de Temascalcingo; que incluyó a 85 hogares integrados por preescolares con desnutrición inscritos al programa Oportunidades. Se determinó el estado nutrición de los preescolares con indicadores antropométricos y se obtuvo el IMC de las madres de estos infantes. Se aplicó una encuesta socionutricional, incluida el recordatorio de 24 horas, y complementado con la observación participante (cualitativa. Se encontró que 83% de las madres mazahuas presentaron sobrepeso u obesidad. El estado de nutrición de los preescolares con madres con obesidad presentó un porcentaje mayor de desnutrición (76%. En la variable género, se encontró que 54% de los niños con madres con obesidad tenía baja talla. Al relacionar el nivel educativo de la madre, esta variable resultó ser estadísticamente significativa (p=0.015, donde el analfabetismo está más relacionado con la desnutrición infantil que tienen madres de bajo y/o peso normal. La elevada prevalencia de hogares conformados con preescolares con desnutrición y madres con obesidad, es un síntoma más de la pobreza en zonas indígenas en México, con bajo índice de desarrollo humano.

  2. Zeeman laser gyroscopes

    Energy Technology Data Exchange (ETDEWEB)

    Azarova, V V; Golyaev, Yu D; Saveliev, I I [Open Joint-Stock Company M.F. Stel' makh Polyus Research Institute, Moscow (Russian Federation)

    2015-02-28

    The history of invention and development of Zeeman laser gyroscopes, specific features of their optical scheme and operation principle are described. The construction and element base of modern laser angular velocity sensors with Zeeman-based frequency biasing are considered. The problems and prospects of their development are discussed. (laser gyroscopes)

  3. On g -ray laser

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    We review various possibilities for realizing a g-ray laser. We conclude that, similar to the free-electron laser, it is practical to generate the g-ray laser by the stimulated emission of radiation from wiggling positrons channelled in a periodically bent crystal. It is the time to research this possi-bility both theoretically and experimentally with big efforts.

  4. Laser Programs Highlights 1998

    Energy Technology Data Exchange (ETDEWEB)

    Lowdermilk, H.; Cassady, C.

    1999-12-01

    This report covers the following topics: Commentary; Laser Programs; Inertial Confinement Fusion/National Ignition Facility (ICF/NIF); Atomic Vapor Laser Isotope Separation (AVLIS); Laser Science and Technology (LS&T); Information Science and Technology Program (IS&T); Strategic Materials Applications Program (SMAP); Medical Technology Program (MTP) and Awards.

  5. Lasers for nonlinear microscopy.

    Science.gov (United States)

    Wise, Frank

    2013-03-01

    Various versions of nonlinear microscopy are revolutionizing the life sciences, almost all of which are made possible because of the development of ultrafast lasers. In this article, the main properties and technical features of short-pulse lasers used in nonlinear microscopy are summarized. Recent research results on fiber lasers that will impact future instruments are also discussed.

  6. Laser power transmission

    Science.gov (United States)

    Conway, Edmund J.

    1992-01-01

    An overview of previous studies related to laser power transmission is presented. Particular attention is given to the use of solar pumped lasers for space power applications. Three general laser mechanisms are addressed: photodissociation lasing driven by sunlight, photoexcitation lasing driven directly by sunlight, and photoexcitation lasing driven by thermal radiation.

  7. LaserFest Celebration

    Energy Technology Data Exchange (ETDEWEB)

    Dr. Alan Chodos; Elizabeth A. Rogan

    2011-08-25

    LaserFest was the yearlong celebration, during 2010, of the 50th anniversary of the demonstration of the first working laser. The goals of LaserFest were: to highlight the impact of the laser in its manifold commercial, industrial and medical applications, and as a tool for ongoing scientific research; to use the laser as one example that illustrates, more generally, the route from scientific innovation to technological application; to use the laser as a vehicle for outreach, to stimulate interest among students and the public in aspects of physical science; to recognize and honor the pioneers who developed the laser and its many applications; to increase awareness among policymakers of the importance of R&D funding as evidenced by such technology as lasers. One way in which LaserFest sought to meet its goals was to encourage relevant activities at a local level all across the country -- and also abroad -- that would be identified with the larger purposes of the celebration and would carry the LaserFest name. Organizers were encouraged to record and advertise these events through a continually updated web-based calendar. Four projects were explicitly detailed in the proposals: 1) LaserFest on the Road; 2) Videos; 3) Educational material; and 4) Laser Days.

  8. Diode laser and endoscopic laser surgery.

    Science.gov (United States)

    Sullins, Kenneth E

    2002-05-01

    Two functionally important differences exist between the diode laser and the carbon dioxide (CO2) laser (used more commonly in small animal surgery). Diode laser energy is delivered through a quartz fiber instead of being reflected through an articulated arm or waveguide. Quartz fibers are generally more flexible and resilient than waveguides and can be inserted through an endoscope for minimally invasive procedures. Laser-tissue interaction is the other significant difference. The CO2 laser is completely absorbed by water, which limits the effect to visible tissue. The diode wavelength is minimally absorbed by water and may affect tissue as deep as 10 mm below the surface in the free-beam mode. With proper respect for the tissue effect, these differences can be used to the advantage of the patient.

  9. El empleo de las personas con discapacidad

    OpenAIRE

    Egea García, Carlos

    2014-01-01

    En 2012 había un total de 1.450.800 personas con certificado de discapacidad en edad de trabajar (de 16 a 64 años), lo que supuso el 4,8% de la población total en edad laboral. En este artículo se analiza la situación laboral del colectivo de personas con discapacidad que participa en el mercado de trabajo (activos), comparándola con la del resto de la población. Dado que en esta comparación pueden incidir, además de la discapacidad, otras características personales, se ofrece en primer lugar...

  10. Pénfigo seborreico con eritema polimorfo

    Directory of Open Access Journals (Sweden)

    Marisabel R. Coronel Q.

    2009-12-01

    Full Text Available Paciente femenino de 50 años, internadapor presentar dolor intenso generalizadoen la piel. Presenta lesiones dérmicasde mas o menos 2 meses de evolución, conáreas eritematosas y vesículas que confluyena ampollas con fondo eritematoso, que conel tiempo se extendió a una gran superficiedel cuerpo. Al examen físico se evidencian:lesiones dérmicas sobreinfectadas con secreciónpurulenta en algunas regiones delcuerpo (cuello y brazos además de lesioneshiperqueratósicas y decamativas que comprometentodo el cuerpo. El diagnóstico deingreso fue pénfigo vulgar impetiginizadocon hepatitis autoinmune.

  11. Polycarbazoles microcavities: towards plastic blue lasers

    Energy Technology Data Exchange (ETDEWEB)

    Castex, M.C.; Olivero, C.; Fischer, A.; Mousel, S.; Michelon, J.; Ades, D.; Siove, A

    2002-09-30

    With the aim of developing a plastic blue laser emitting around 400 nm, we have investigated the luminescence and lasing possibilities of recently designed new polymeric materials based on carbazole chromophores. Our carbazole compounds are used either as doping organic dyes in usual polymer cast films (e.g. PMMA) or as thin layers deposited onto a quartz substrate. In both cases, by using different interferometric methods, periodic patterning of surfaces has been realised and compared. Efficient relief gratings are produced by laser irradiation at 193 nm of a phase mask ({lambda}=1090 nm) in con onto carbazolic films. We demonstrate that such patterning allows photopumping of doped PMMA films in a planar waveguide configuration with distributed feedback (DFB) even for high Bragg grating order (m=6). Monomode stimulated emission is observed for rhodamine doped PMMA film. Preliminary results concerning UV photopumping of carbazolic films are presented.

  12. Traducir utilizando Internet, Traducir con Speechy Project

    OpenAIRE

    Nicolás Fermín Pino James

    2011-01-01

    Speechy Project surgió el pasado otoño de 2009 con la intención de ayudar a estudiantes de nivel avanzado de lengua inglesa a sacarle partido a Internet. Desde entonces, este sitio web ha “tamizado” la red con el objetivo de seleccionar los mejores recursos online y clasificarlos ordenadamente en sus listas a posteriori.  En esta corriente, varias filtraciones se han llevado a cabo en diferentes campos de la lengua inglesa. Este artículo se centrará en el campo de la Traducción que se proyect...

  13. Diarrea en el paciente con diabetes mellitus

    Directory of Open Access Journals (Sweden)

    Jainer Méndez-Flórez

    2015-10-01

    Full Text Available La diabetes mellitus es una enfermedad de gran prevalencia a nivel mundial que conlleva a muchas complicaciones, de las cuales las gastrointestinales son las mayormente olvidadas por el personal médico. Hasta el 22% de los pacientes con diabetes mellitus pueden tener diarrea y la causa de ello es multifactorial, pues incluye la neuropatía, efectos adversos de la terapia antidiabética, el aumento de la miocrobiota intestinal, entre otras. El tratamiento más efectivo es el control estricto de la glucemia; sin embargo, algunos medicamentos han sido utilizados con algún tipo de beneficio en estos pacientes.

  14. Hiperalgesia asociada al tratamiento con opioides

    Directory of Open Access Journals (Sweden)

    A. Gil Martín

    2014-10-01

    Full Text Available La hiperalgesia inducida por opioides es una reacción paradójica caracterizada por una percepción intensificada de dolor relacionada con el uso de estos medicamentos en ausencia de progresión de la enfermedad o de síndrome de retirada. A diferencia de los casos de tolerancia, definida como pérdida de potencia analgésica durante el uso prolongado de opioides, no se produce mejoría con el escalado de dosis. La hiperalgesia inducida por opioides se ha manifestado en pacientes con dosis de mantenimiento y retirada, pacientes con dosis elevadas o escalado de dosis y pacientes con dosis ultra bajas. Para establecer un diagnóstico diferencial es importante tener en cuenta que un incremento de dosis puede producir una mejoría temporal en pacientes con tolerancia pero no en los que han desarrollado hiperalgesia. La prevalencia de dicho fenómeno es desconocida, pero puede ser más frecuente de lo esperado y muchas veces no reconocido. El mecanismo subyacente no está bien definido, pero existen diversos estudios experimentales tanto en modelos animales como en humanos en los que se observa que la hiperalgesia no está desencadenada por un único factor, sino que son muchos los implicados. Entre los mecanismos propuestos destacan: la mediación del receptor NMDA (N-metil-D-aspartato activado por la liberación presináptica de glutamato, la modulación por la proteína-kinasa de calcio/calmodulina, el aumento en el número de nociceptores o la liberación de neurotransmisores excitadores. Se han realizado diversos estudios para describir la expresión y la relevancia de la hiperalgesia inducida por opioides en distintos grupos de pacientes: ex-adictos a opioides en tratamiento de mantenimiento con metadona, en exposición perioperatoria, en voluntarios sanos o en dolor crónico. Existen diferentes estrategias de tratamiento disponibles; entre las más aceptadas se encuentra la reducción en la dosis del opioide utilizado, la rotación del

  15. Galaxias australes con núcleo doble

    Science.gov (United States)

    Gimeno, G.; Díaz, R.; Carranza, G.

    Se estudia una muestra de galaxias australes con núcleo doble a partir de una búsqueda extensiva en la literatura. Se analizan las características morfológicas, fotométricas y espectroscópicas de la muestra. Para algunas galaxias se han realizado observaciones con el espectrógrafo multifunción (EMF) de la Estación Astrofísica de Bosque Alegre a partir de las cuales se determinaron parámetros cinemáticos.

  16. Eutanasia : el derecho a morir con dignidad

    OpenAIRE

    Espinosa Peláez, Tania

    2014-01-01

    En este trabajo se da a conocer el controvertido tema de la eutanasia, un tema muy actual debido al debate generado por la nueva ley de eutanasia infantil aprobada en Bélgica durante el mes de febrero del 2014. Con este trabajo se pretende lanzar una vista general de los problemas ético-legales que supone la eutanasia así como los problemas morales que genera en el personal sanitario que trabaja con los enfermos terminales que deciden pedirlo. A lo largo del mismo se habla de los motivos que ...

  17. Ríete con las Mates

    OpenAIRE

    López González, M. Dolores

    2013-01-01

    Este articulo presenta la exposición “Ríete con las Mates: Viñetas Cómicas Matemáticas” que el Grupo de Innovación Educativa (GIE) “Pensamiento Matemático" de la Universidad Politécnica de Madrid (UPM) ha confeccionado con la colaboración de alumnos de la Escuela Técnica Superior de Ingenieros de Caminos, Canales y Puertos de la UPM. El trabajo quiere poner de manifiesto la utilidad de las exposiciones como recurso docente en la enseñanza de las matemáticas

  18. La experiencia educativa con menores infractores sancionados

    OpenAIRE

    Cuadra, Daniel

    2016-01-01

    Con la ponencia denominada: “La experiencia educativa con menores infractores sancionados”, Daniel Cuadra, coordinador del centro para la ejecución de la medida sancionadora de convivencia en grupo educativo de la Asociación Meridianos, ha analizado la labor de los grupos de convivencia en el sistema de reforma juvenil de la Junta de Andalucía. En particular, ha explicado las causas que llevan a los menores a la delincuencia y el tratamiento integral que reciben en los centros. De igual forma...

  19. TIROTOXICOSIS GESTACIONAL: PATOLOGIA CON RIESGO VITAL

    OpenAIRE

    Valdés R.,Enrique; PILASI M,CARLOS; Núñez U.,Tatiana

    2003-01-01

    Se presenta un caso clínico con diagnóstico final de Tirotoxicosis gestacional que debuta con una complicación excepcional, insuficiencia cardíaca congestiva e hipertensión pulmonar severa. Se presenta la experiencia del Hospital Clínico de la Universidad de Chile, proponiendo que su diagnóstico y tratamiento oportunos son la base del pronóstico de esta patología de riesgo vital para el binomio madre-hijo

  20. Pensamiento divergente y creatividad con personas mayores

    OpenAIRE

    2015-01-01

    Este trabajo revisa la información existente sobre el pensamiento divergente y la creatividad considerando estos aspectos muy importantes dando importancia a la neuroeducación como la mejor manera de transmitir los conocimientos para un aprendizaje a largo plazo. Se propondrá un proyecto de intervención para realizar con personas mayores que mejore estos valores y así su vida, ralentizando así el deterioro cognitivo asociado a la edad y se fomentan valores relacionados con la sociali...

  1. Intervista con Igor’ Pil’šikov

    OpenAIRE

    Ornella Discacciati

    2013-01-01

      Igor’ Pil’šikov, Doktor nauk in Linguistica Generale e Teoria Letteraria, è Leading Researcher all’Istituto di cultura mondiale dell’Università statale Lomonosov di Mosca e Senior Researcher presso la Facoltà di Scienze Umanisitiche dell’Università statale di Tallin. Autore di numerosi saggi sulla teoria letteraria e la letteratura russa, ha pubblicato Batjuškov e la letteratura italiana (2003) e Leksika i frazeologija “Evgenija Onegina” (2008, con I.G. Dobromodov). Ha curato con M. Šapir e...

  2. Intervista con Igor’ Pil’šikov

    Directory of Open Access Journals (Sweden)

    Ornella Discacciati

    2013-12-01

    Full Text Available   Igor’ Pil’šikov, Doktor nauk in Linguistica Generale e Teoria Letteraria, è Leading Researcher all’Istituto di cultura mondiale dell’Università statale Lomonosov di Mosca e Senior Researcher presso la Facoltà di Scienze Umanisitiche dell’Università statale di Tallin. Autore di numerosi saggi sulla teoria letteraria e la letteratura russa, ha pubblicato Batjuškov e la letteratura italiana (2003 e Leksika i frazeologija “Evgenija Onegina” (2008, con I.G. Dobromodov. Ha curato con M. Šapir e M. Akimova il volume di Boris Jarcho Metodologija točnogo literaturovedenija (2006. 

  3. Sarcoma de Kaposi en paciente con SIDA

    OpenAIRE

    Jesús Ramón León Polanco; Tereza Rodríguez Feliz; Ángel Franco Yee

    2015-01-01

    Se presenta el caso de un paciente masculino de 33 años de edad, con antecedentes de VIH-SIDA desde hace 10 años, que se mantiene en tratamiento con antirretrovirales. Durante todo este tiempo ha presentado varios episodios de infecciones respiratorias, incluyendo tuberculosis pulmonar 5 años atrás. Acude a consulta refiriendo edemas en miembros inferiores acompañado de lesiones en piel de color violáceo de un año de evolución, previamente interpretado como linfangitis rebelde al tratamiento ...

  4. Manejo de conductos radiculares con curvatura marcada

    OpenAIRE

    Jorge Mario Nuñez Duran

    2013-01-01

    Las variaciones anatómicas en dientes con conductos que poseen dilaceraciones hacen del tratamiento de endodonciaun reto o una complicación relativa, en donde el clínico debe desarrollar toda su habilidad y el uso de instrumentosespeciales que faciliten u optimicen la terapia de conductos radiculares. La toma de radiografías previas con diferentesangulaciones y el estudio minucioso de ellas, darán una ayuda fundamental para conocer más detalladamente estacomplicación anatómica, que en algunos...

  5. Photoionization in alkali lasers.

    Science.gov (United States)

    Knize, R J; Zhdanov, B V; Shaffer, M K

    2011-04-11

    We have calculated photoionization rates in alkali lasers. The photoionization of alkali atoms in the gain medium of alkali lasers can significantly degrade the laser performance by reducing the neutral alkali density and with it the gain. For a ten atmosphere Rb laser and a Cs exciplex laser, the photoionization induced alkali atom loss rates are greater than 10(5) sec(-1). These high loss rates will quickly deplete the neutral alkali density, reducing gain, and may require fast, possibly, supersonic flow rates to sufficiently replenish the neutral medium for CW operation.

  6. Coherent laser beam combining

    CERN Document Server

    Brignon, Arnaud

    2013-01-01

    Recently, the improvement of diode pumping in solid state lasers and the development of double clad fiber lasers have allowed to maintain excellent laser beam quality with single mode fibers. However, the fiber output power if often limited below a power damage threshold. Coherent laser beam combining (CLBC) brings a solution to these limitations by identifying the most efficient architectures and allowing for excellent spectral and spatial quality. This knowledge will become critical for the design of the next generation high-power lasers and is of major interest to many industrial, environme

  7. Lasers In Dentistry

    Directory of Open Access Journals (Sweden)

    Prasanth. S

    2011-07-01

    Full Text Available The uses of Lasers in dentistry have revolutionized several areas of treatment in the last three & a half decades of the 20th century. Initially it was used for ablating the hard tissues for acid etch treatment. Later Lasers were used for cutting, coagulation & cauterization of the soft tissues. It is also been used for the diagnosis of carious lesions& to test pulp vitality with Doppler. There are more than 40 uses for Laser. Initially Lasers were very expensive, but now they have become much cheaper. Portable models are available which have increased its versatility. Lasers will be the main weapon in the armamentarium of the dental surgeons.

  8. Quantum well lasers

    CERN Document Server

    Zory, Jr, Peter S; Kelley, Paul

    1993-01-01

    This book provides the information necessary for the reader to achieve a thorough understanding of all aspects of QW lasers - from the basic mechanism of optical gain, through the current technolgoical state of the art, to the future technologies of quantum wires and quantum dots. In view of the growing importance of QW lasers, this book should be read by all those with an active interest in laser science and technology, from the advanced student to the experienced laser scientist.* The first comprehensive book-length treatment of quantum well lasers* Provides a detailed treatment

  9. Tunable laser applications

    CERN Document Server

    Duarte, FJ

    2008-01-01

    Introduction F. J. Duarte Spectroscopic Applications of Tunable Optical Parametric Oscillators B. J. Orr, R. T. White, and Y. He Solid-State Dye Lasers Costela, I. García-Moreno, and R. Sastre Tunable Lasers Based on Dye-Doped Polymer Gain Media Incorporating Homogeneous Distributions of Functional Nanoparticles F. J. Duarte and R. O. James Broadly Tunable External-Cavity Semiconductor Lasers F. J. Duarte Tunable Fiber Lasers T. M. Shay and F. J. Duarte Fiber Laser Overview and Medical Applications

  10. Laser Diode Ignition (LDI)

    Science.gov (United States)

    Kass, William J.; Andrews, Larry A.; Boney, Craig M.; Chow, Weng W.; Clements, James W.; Merson, John A.; Salas, F. Jim; Williams, Randy J.; Hinkle, Lane R.

    1994-01-01

    This paper reviews the status of the Laser Diode Ignition (LDI) program at Sandia National Labs. One watt laser diodes have been characterized for use with a single explosive actuator. Extensive measurements of the effect of electrostatic discharge (ESD) pulses on the laser diode optical output have been made. Characterization of optical fiber and connectors over temperature has been done. Multiple laser diodes have been packaged to ignite multiple explosive devices and an eight element laser diode array has been recently tested by igniting eight explosive devices at predetermined 100 ms intervals.

  11. Laser Applications in Orthodontics

    Science.gov (United States)

    Heidari, Somayeh; Torkan, Sepideh

    2013-01-01

    A laser is a collimated single wavelength of light which delivers a concentrated source of energy. Soon after different types of lasers were invented, investigators began to examine the effects of different wavelengths of laser energy on oral tissues, routine dental procedures and experimental applications. Orthodontists, along with other specialist in different fields of dentistry, can now benefit from several different advantages that lasers provide during the treatment process, from the beginning of the treatment, when separators are placed, to the time of resin residues removal from the tooth surface at the end of orthodontic treatment. This article outlines some of the most common usages of laser beam in orthodontics and also provides a comparison between laser and other conventional method that were the standard of care prior to the advent of laser in this field. PMID:25606324

  12. Lasers in orthodontics

    Science.gov (United States)

    Nalcaci, Ruhi; Cokakoglu, Serpil

    2013-01-01

    Many types of dental lasers are currently available that can be efficiently used for soft and hard tissue applications in the field of orthodontics. For achieving the desired effects in the target tissue, knowledge of laser characteristics such as power, wavelength and timing, is necessary. Laser therapy is advantageous because it often avoids bleeding, can be pain free, is non-invasive and is relatively quick. The high cost is its primary disadvantage. It is very important to take the necessary precautions to prevent possible tissue damage when using laser dental systems. Here, we reviewed the main types and characteristics of laser systems used in dental practice and discuss the applications of lasers in orthodontics, harmful effects and laser system safety. PMID:24966719

  13. Flexible Laser Metal Cutting

    DEFF Research Database (Denmark)

    Villumsen, Sigurd; Jørgensen, Steffen Nordahl; Kristiansen, Morten

    2014-01-01

    This paper describes a new flexible and fast approach to laser cutting called ROBOCUT. Combined with CAD/CAM technology, laser cutting of metal provides the flexibility to perform one-of-a-kind cutting and hereby realises mass production of customised products. Today’s laser cutting techniques...... possess, despite their wide use in industry, limitations regarding speed and geometry. Research trends point towards remote laser cutting techniques which can improve speed and geometrical freedom and hereby the competitiveness of laser cutting compared to fixed-tool-based cutting technology...... such as punching. This paper presents the concepts and preliminary test results of the ROBOCUT laser cutting technology, a technology which potentially can revolutionise laser cutting....

  14. Mode selection laser

    DEFF Research Database (Denmark)

    2014-01-01

    The invention relates to a semiconductor mode selection laser, particularly to a VCSEL laser (200) having mode selection properties. The mode selection capability of the laser is achieved by configuring one of the reflectors (15,51) in the resonance cavity so that a reflectivity of the reflector...... (15) varies spatially in one dimension or two dimensions. Accordingly, the reflector (15) with spatially varying reflectivity is part both of the resonance cavity and the mode selection functionality of the laser. A plurality of the lasers configured with different mode selectors, i.e. different...... spatial reflector variations, may be combined to generate a laser beam containing a plurality of orthogonal modes. The laser beam may be injected into a few- mode optical fiber, e.g. for the purpose of optical communication. The VCSEL may have intra-cavity contacts (31,37) and a Tunnel junction (33...

  15. ORION laser target diagnostics

    Energy Technology Data Exchange (ETDEWEB)

    Bentley, C. D.; Edwards, R. D.; Andrew, J. E.; James, S. F.; Gardner, M. D.; Comley, A. J.; Vaughan, K.; Horsfield, C. J.; Rubery, M. S.; Rothman, S. D.; Daykin, S.; Masoero, S. J.; Palmer, J. B.; Meadowcroft, A. L.; Williams, B. M.; Gumbrell, E. T.; Fyrth, J. D.; Brown, C. R. D.; Hill, M. P.; Oades, K. [Plasma Physics Department, Atomic Weapons Establishment, Aldermaston, Reading, Berkshire RG7 4PR (United Kingdom); and others

    2012-10-15

    The ORION laser facility is one of the UK's premier laser facilities which became operational at AWE in 2010. Its primary mission is one of stockpile stewardship, ORION will extend the UK's experimental plasma physics capability to the high temperature, high density regime relevant to Atomic Weapons Establishment's (AWE) program. The ORION laser combines ten laser beams operating in the ns regime with two sub ps short pulse chirped pulse amplification beams. This gives the UK a unique combined long pulse/short pulse laser capability which is not only available to AWE personnel but also gives access to our international partners and visiting UK academia. The ORION laser facility is equipped with a comprehensive suite of some 45 diagnostics covering optical, particle, and x-ray diagnostics all able to image the laser target interaction point. This paper focuses on a small selection of these diagnostics.

  16. Nanofabrication with pulsed lasers.

    Science.gov (United States)

    Kabashin, Av; Delaporte, Ph; Pereira, A; Grojo, D; Torres, R; Sarnet, Th; Sentis, M

    2010-02-24

    An overview of pulsed laser-assisted methods for nanofabrication, which are currently developed in our Institute (LP3), is presented. The methods compass a variety of possibilities for material nanostructuring offered by laser-matter interactions and imply either the nanostructuring of the laser-illuminated surface itself, as in cases of direct laser ablation or laser plasma-assisted treatment of semiconductors to form light-absorbing and light-emitting nano-architectures, as well as periodic nanoarrays, or laser-assisted production of nanoclusters and their controlled growth in gaseous or liquid medium to form nanostructured films or colloidal nanoparticles. Nanomaterials synthesized by laser-assisted methods have a variety of unique properties, not reproducible by any other route, and are of importance for photovoltaics, optoelectronics, biological sensing, imaging and therapeutics.

  17. Raman fiber lasers

    Science.gov (United States)

    Supradeepa, V. R.; Feng, Yan; Nicholson, Jeffrey W.

    2017-02-01

    High-power fiber lasers have seen tremendous development in the last decade, with output powers exceeding multiple kilowatts from a single fiber. Ytterbium has been at the forefront as the primary rare-earth-doped gain medium owing to its inherent material advantages. However, for this reason, the lasers are largely confined to the narrow emission wavelength region of ytterbium. Power scaling at other wavelength regions has lagged significantly, and a large number of applications rely upon the diversity of emission wavelengths. Currently, Raman fiber lasers are the only known wavelength agile, scalable, high-power fiber laser technology that can span the wavelength spectrum. In this review, we address the technology of Raman fiber lasers, specifically focused on the most recent developments. We will also discuss several applications of Raman fiber lasers in laser pumping, frequency conversion, optical communications and biology.

  18. Lasers in materials science

    CERN Document Server

    Ossi, Paolo; Zhigilei, Leonid

    2014-01-01

    This book covers various aspects of lasers in materials science, including a comprehensive overview on basic principles of laser-materials interactions and applications enabled by pulsed laser systems.  The material is organized in a coherent way, providing the reader with a harmonic architecture. While systematically covering the major current and emerging areas of lasers processing applications, the Volume provides examples of targeted modification of material properties achieved through careful control of the processing conditions and laser irradiation parameters. Special emphasis is placed on specific strategies aimed at nanoscale control of material structure and properties to match the stringent requirements of modern applications.  Laser fabrication of novel nanomaterials, which expands to the domains of photonics, photovoltaics, sensing, and biomedical applications, is also discussed in the Volume. This book assembles chapters based on lectures delivered at the Venice International School on Lasers...

  19. Alternate laser fusion drivers

    Energy Technology Data Exchange (ETDEWEB)

    Pleasance, L.D.

    1979-11-01

    Over the past few years, several laser systems have been considered as possible laser fusion drivers. Recently, there has been an increasing effort to evaluate these systems in terms of a reactor driver application. The specifications for such a system have become firmer and generally more restrictive. Several of the promising candidates such as the group VI laser, the metal vapor excimers and some solid state lasers can be eliminated on the basis of inefficiency. New solid state systems may impact the long range development of a fusion driver. Of the short wavelength gas lasers, the KrF laser used in conjunction with Raman compression and pulse stacking techniques is the most promising approach. Efficiencies approaching 10% may be possible with this system. While technically feasible, these approaches are complex and costly and are unsatisfying in an aethetic sense. A search for new lasers with more compelling features is still needed.

  20. ORION laser target diagnostics.

    Science.gov (United States)

    Bentley, C D; Edwards, R D; Andrew, J E; James, S F; Gardner, M D; Comley, A J; Vaughan, K; Horsfield, C J; Rubery, M S; Rothman, S D; Daykin, S; Masoero, S J; Palmer, J B; Meadowcroft, A L; Williams, B M; Gumbrell, E T; Fyrth, J D; Brown, C R D; Hill, M P; Oades, K; Wright, M J; Hood, B A; Kemshall, P

    2012-10-01

    The ORION laser facility is one of the UK's premier laser facilities which became operational at AWE in 2010. Its primary mission is one of stockpile stewardship, ORION will extend the UK's experimental plasma physics capability to the high temperature, high density regime relevant to Atomic Weapons Establishment's (AWE) program. The ORION laser combines ten laser beams operating in the ns regime with two sub ps short pulse chirped pulse amplification beams. This gives the UK a unique combined long pulse/short pulse laser capability which is not only available to AWE personnel but also gives access to our international partners and visiting UK academia. The ORION laser facility is equipped with a comprehensive suite of some 45 diagnostics covering optical, particle, and x-ray diagnostics all able to image the laser target interaction point. This paper focuses on a small selection of these diagnostics.

  1. Semiconductor nanowire lasers

    Science.gov (United States)

    Eaton, Samuel W.; Fu, Anthony; Wong, Andrew B.; Ning, Cun-Zheng; Yang, Peidong

    2016-06-01

    The discovery and continued development of the laser has revolutionized both science and industry. The advent of miniaturized, semiconductor lasers has made this technology an integral part of everyday life. Exciting research continues with a new focus on nanowire lasers because of their great potential in the field of optoelectronics. In this Review, we explore the latest advancements in the development of nanowire lasers and offer our perspective on future improvements and trends. We discuss fundamental material considerations and the latest, most effective materials for nanowire lasers. A discussion of novel cavity designs and amplification methods is followed by some of the latest work on surface plasmon polariton nanowire lasers. Finally, exciting new reports of electrically pumped nanowire lasers with the potential for integrated optoelectronic applications are described.

  2. Lasers in space

    Science.gov (United States)

    Michaelis, M. M.; Forbes, A.; Bingham, R.; Kellett, B. J.; Mathye, A.

    2008-05-01

    A variety of laser applications in space, past, present, future and far future are reviewed together with the contributions of some of the scientists and engineers involved, especially those that happen to have South African connections. Historically, two of the earliest laser applications in space, were atmospheric LIDAR and lunar ranging. These applications involved atmospheric physicists, several astronauts and many of the staff recruited into the Soviet and North American lunar exploration programmes. There is a strong interest in South Africa in both LIDAR and lunar ranging. Shortly after the birth of the laser (and even just prior) theoretical work on photonic propulsion and space propulsion by laser ablation was initiated by Georgii Marx, Arthur Kantrowitz and Eugen Saenger. Present or near future experimental programs are developing in the following fields: laser ablation propulsion, possibly coupled with rail gun or gas gun propulsion; interplanetary laser transmission; laser altimetry; gravity wave detection by space based Michelson interferometry; the de-orbiting of space debris by high power lasers; atom laser interferometry in space. Far future applications of laser-photonic space-propulsion were also pioneered by Carl Sagan and Robert Forward. They envisaged means of putting Saenger's ideas into practice. Forward also invented a laser based method for manufacturing solid antimatter or SANTIM, well before the ongoing experiments at CERN with anti-hydrogen production and laser-trapping. SANTIM would be an ideal propellant for interstellar missions if it could be manufactured in sufficient quantities. It would be equally useful as a power source for the transmission of information over light year distances. We briefly mention military lasers. Last but not least, we address naturally occurring lasers in space and pose the question: "did the Big Bang lase?"

  3. Tunable lasers for waste management photochemistry applications. [Dye lasers, excimer lasers, IR lasers

    Energy Technology Data Exchange (ETDEWEB)

    Finch, F.T. (comp.)

    1978-09-01

    A review of lasers with potential photochemical applications in waste management indicates that dye lasers, as a class, can provide tunable laser output through the visible and near-uv regions of the spectrum of most interest to photochemistry. Many variables can affect the performance of a specific dye laser, and the interactions of these variables, at the current state of the art, are complex. The recent literature on dye-laser characteristics has been reviewed and summarized, with emphasis on those parameters that most likely will affect the scaling of dye lasers in photochemical applications. Current costs are reviewed and correlated with output power. A new class of efficient uv lasers that appear to be scalable in both energy output and pulse rate, based on rare-gas halide excimers and similar molecules, is certain to find major applications in photochemistry. Because the most important developments are too recent to be adequately described in the literature or are the likely outcome of current experiments, the basic physics underlying the class of excimer lasers is described. Specific cost data are unavailable, but these new gas lasers should reflect costs similar to those of existing gas lasers, in particular, the pulsed CO/sub 2/ lasers. To complete the survey of tunable-laser characteristics, the technical characteristics of the various classes of lasers in the ir are summarized. Important developments in ir laser technology are being accelerated by isotope-separation research, but, initially at least, this portion of the spectrum is least likely to receive emphasis in waste-management-oriented photochemistry.

  4. Calidad de vida relacionada con la salud en pacientes con enfermedad renal crónica

    Directory of Open Access Journals (Sweden)

    Lilian Barros-Higgins

    2015-10-01

    Full Text Available Antecedentes. La calidad de vida relacionada con la salud se puede afectar en personas con enfermedad renal crónica. Objetivo. Determinar la calidad de vida relacionada con la salud de los pacientes con enfermedad renal crónica (ERC y su relación con variables sociodemográficas y datos clínicos. Materiales y métodos. Estudio analítico de corte transversal realizado en 80 personas con diagnóstico de enfermedad renal crónica. Participaron los pacientes que asistieron a la Unidad Renal y al servicio de hospitalización durante los meses de estudio. Se aplicó el cuestionario Kidney Disease Quality of Life (KDQOL-SF, valorando ocho dimensiones genéricas de la calidad de vida relacionada con la salud y tres específicas relacionadas con la enfermedad renal. Se compararon las variables socio demográficas y las relacionadas con la enfermedad con las dimensiones del KDQOOL-36. Resultados. El 23.5% de la población estudiada tenía entre 61 y 70 años y 51.3% eran hombres. Se obtuvieron promedios bajos en las dimensiones carga de la enfermedad renal (40.3, salud física (33.4 y salud mental (43.5 del componente genérico. Se encontró una correlación significativa de la edad con las dimensiones efectos de la enfermedad renal en la vida diaria (0.238, p=0.03 y el componente genérico salud física (-0.242, p=0.03. Un trabajo remunerado se correlacionó positivamente con los componentes genéricos salud física (0.499, p=0.001 y salud mental (0.375, p=0.001 y la carga de la enfermedad renal se correlacionó negativamente con el tiempo de diagnóstico de enfermedad renal (-0.241, p=0.02. Conclusión. La enfermedad renal crónica tiene una carga sobre la calidad de vida de los pacientes en términos de salud física, salud mental y carga de la enfermedad.

  5. Optical coatings for fiber lasers

    Institute of Scientific and Technical Information of China (English)

    HONG Dong-mei; ZHU Zhen; YUE Wei

    2005-01-01

    Fiber laser is the future development direction for the high energy lasers. This paper describs two kinds of optical coatings for fiber laser, including long and short wave pass filters. The one characteristic of fiber laser coatings lies in that coatings should separate two closely wavelength light including laser pump wavelength (980 nm) and laser irradiation wavelength(1 050~1 100 nm). At the same time, the coatings should have high laser damage threshold.

  6. IoT con Raspberry Pi

    OpenAIRE

    García Muelas, Carlos

    2015-01-01

    Estudio de diferentes plataformas software y hardware del internet de las cosas. Aplicación real con Raspberry Pi. Estudi de diferents plataformes programari i maquinari de l'internet de les coses. Aplicació real amb Raspberry Pi. Bachelor thesis for the Telecommunication Technologies program on Telematics.

  7. Conversazioni autobiografiche con Albino Sacco-Casamassima

    Directory of Open Access Journals (Sweden)

    Orazio Maria Valastro

    2004-03-01

    Full Text Available Nel 1948 venne Olivetti a Matera. Olivetti venne a Matera con un certo ambasciatore americano che praticamente aveva preparato o stava dando una mano per il piano Marschall, venne a Matera e mi vollero incontrare. Io sono stato chiamato dalla piazza, stavo nella piazza, era il mese di luglio, una cosa di questo genere, e andai in un bar, un bar ad angolo mi ricordo in Via Don Minzioni, dove questo Olivetti mi disse 'ma lei che cosa fa coi sassi?' 'Che cos'è questa storia?' Gli raccontai un po' che cosa facevo io con questi amici, avevamo fatto questo, insomma tutto quello che avevamo fatto nei sassi e che volevamo preparare ancora per presentare a qualcuno un piano di revisionamento dei sassi. Mi ricordo, era la prima volta che avevo visto Adriano Olivetti, ne avevo sentito parlare però non avevo mai visto quest'uomo con gli occhi celesti, minuto, coi capelli bianchi, riccioluto, con una cravatta bianca, cosa che mi fece impressione, una specie di angelo.

  8. PLACENTA PREVIA PERCRETA CON INVASION VESICAL

    OpenAIRE

    Perucca,Ernesto; Cazenave,Henry; Barra,Alejandro; Ochoa,Nelson; Villagrán,Gabriel; Espinoza,Rosemary; Estay,Ricardo; Bustamante,Rodrigo; Siebert,Alejandra

    2002-01-01

    Se presentan 3 nuevos casos de placenta percreta con invasión a vejiga ocurridos en nuestro Servicio. Uno de ellos fue diagnosticado durante el embarazo, los otros dos casos fueron hallazgos intraoperatorios. La evolución clínica de las tres pacientes fue satisfactoria

  9. Sarcoma de Kaposi en paciente con SIDA

    Directory of Open Access Journals (Sweden)

    Jesús Ramón León Polanco

    2015-01-01

    Full Text Available Se presenta el caso de un paciente masculino de 33 años de edad, con antecedentes de VIH-SIDA desde hace 10 años, que se mantiene en tratamiento con antirretrovirales. Durante todo este tiempo ha presentado varios episodios de infecciones respiratorias, incluyendo tuberculosis pulmonar 5 años atrás. Acude a consulta refiriendo edemas en miembros inferiores acompañado de lesiones en piel de color violáceo de un año de evolución, previamente interpretado como linfangitis rebelde al tratamiento y que se extendió a la cara interna de los muslos y a los miembros inferiores. Con pérdida de peso, no prurito en las lesiones, fiebre, lesiones en la mucosa oral. Se determinó hemoglobina 89 g/L, leucocitos 4,5 x 109 /L, se estudiaron las funciones hepática y renales resultando normales. Radiografías de tórax y ultrasonido abdominal normales. Se realizó estudio anatomopatológico de piel que informó Sarcoma de Kaposi. Se impuso tratamiento con quimioterapia

  10. Ocio Inclusivo para personas con discapacidad

    OpenAIRE

    Ruiloba Arce, Marta María

    2014-01-01

    Mi proyecto de Fin de Grado trata del ocio inclusivo para personas con discapacidad intelectual. Como educadora social apuesto por la inclusión social para la mejora de calidad de vida de las personas, siendo uno de los medios más efectivos para lograr una sociedad sin diferencias ni prejuicios. [...

  11. en personas con el VIH/SIDA

    Directory of Open Access Journals (Sweden)

    Ximena Palacios Espinosa

    2006-01-01

    Full Text Available El objetivo de este estudio fue hallar la relación de la intención e ideación suicida con algunas variables sociodemográficas, las características de la enfermedad, el tratamiento antirretroviral y los aspectos piscoafectivos en personas con el VIH/SIDA que residen en Bogotá (Colombia y pertenecientes a una fundación. Para ello, se tomó una muestra de 75 pacientes con VIH positivo a quienes se evaluó a través de una entrevista semiestructurada y dos instrumentos: el inventario de depresión de Beck (IBD y la escala de Ideación Suicida (SSI. Los resultados mostraron que solo 29 personas tenían ideación suicida y 10 intención suicida: De los 10 solo 2 sujetos tenían intención después del diagnóstico. Se encontró una relación estadística significativa para ideación suicida e intención suicida con edad, estrato socioeconómico, estado civil, orientación sexual, las características de la enfermedad, el tratamiento antirretroviral y los aspectos piscoafectivos.

  12. CHLAMYDIA TRACHOMATIS: TRANSMISION VERTICAL CON MEMBRANAS INTEGRAS

    OpenAIRE

    2002-01-01

    Se presenta un caso clínico de transmisión vertical de Chlamydia trachomatis con membranas amniocoriónicas íntegras. Se discute esta rara vía de contagio realizando una revisión actualizada de su diagnóstico y tratamiento

  13. Procesamiento de argumentos en personas con afasia

    Directory of Open Access Journals (Sweden)

    Luis Martínez

    2012-06-01

    Full Text Available En las personas con afasia se alteran diversos procesos lingüísticos. Entre las alteraciones más comunes tenemos aquellas que se producen en el procesamiento sintáctico, lo cual es evidente en el procesamiento de los argumentos. Investigaciones previas realizadas a sujetos con afasia reflejan un procesamientodeficiente de argumentos, lo cual se hace más evidente a medida que el número de argumentos aumenta. Se ha encontrado que mientras mayor es la complejidad en la estructura de la oración, los sujetos afásicos manifiestan mayores dificultades en el procesamiento de la misma. El presente estudio indaga en las dificultades que presentan los sujetos adultos con trastornos afásicos hablantes de español en el procesamiento de argumentos durante tareas de descripción. Este trabajo corrobora la evidencia de que los sujetos con afasia manifiestan un manejo deficiente en el procesamiento de argumentos en las tareas señaladas.

  14. Domótica con Kinect

    OpenAIRE

    VALLS CATALÁ, JAVIER

    2013-01-01

    Sistema domótico utilizando una cámara Kinect y la placa microcontroladora Arduino. Home automation system using a Kinect camera and Arduino microcontroller board. Valls Catalá, J. (2013). Domótica con Kinect. http://hdl.handle.net/10251/33357. Archivo delegado

  15. INTERACCION DE ARSENICO CON MEMBRANAS CELULARES

    OpenAIRE

    2007-01-01

    Con el propósito de contribuir al conocimiento sobre el mecanismo de la toxicidad del arsénico a nivel de membranas celulares, se estudió la interacción del arsenito de sodio [As(Ill)], arseniato de sodio [As(V)], metil arseniato disódico [MMA] y ácido di 122p.

  16. REDUCCIÓN DE ÓXIDOSDE NITROGENO CON CATALIZADORES ZEOLÍTICOS INTERCAMBIADOS CON COBALTO

    Directory of Open Access Journals (Sweden)

    Enrique Alexis García Moya

    2012-10-01

    Full Text Available Se presenta un estudio sobre la reducción catalítica selectiva (RCS de NOx con metano en presencia de oxígeno en exceso con varios catalizadores a base de las zeolitas mordenita, ferrierita y ZSM-5 intercambiadas con diferentes cargas de cobalto y con las correspondientes zeolitas en forma acida. Cuando la mezcla reactiva contenía mayormente NO2 en lugar de NO, los catalizadores ácidos mostraron las más altas velocidades de formación de N2 en condiciones secas. Las mayores actividades se obtuvieron con los catalizadores Co-mordenita, siguiendo en orden de actividad los catalizadores Co-Ferrierita y Co-ZSM-5. El catalizador Co-Mordenita más activo se ensayó con una mezcla reactiva donde predominó el NO en lugar del NO2 bajo condiciones secas e hidrotérmicas y en presencia de SO2. Con la adición de 8% de agua a la mezcla de reacción se observó desactivación reversible, especialmente a bajas temperaturas. La adición de 60 ppm de SO2 disminuyó la velocidad de reacción aproximadamente a la mitad debido posiblemente al envenenamiento de algunos sitios activos.

  17. Laser system using ultra-short laser pulses

    Science.gov (United States)

    Dantus, Marcos; Lozovoy, Vadim V.; Comstock, Matthew

    2009-10-27

    A laser system using ultrashort laser pulses is provided. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and binary pulse shaping (BPS). Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and a SHG crystal.

  18. Factores de Accesibilidad Relacionados con Muerte Perinatal

    Directory of Open Access Journals (Sweden)

    Vilma del Socorro Catalán Álvarez

    2010-12-01

    Full Text Available Introducción: Objetivo Describir diferencias de factores relacionados con accesibilidad a servicios de salud, entre un grupo de mujeres que tuvieron parto en instituciones prestadoras de servicios de salud de Bucaramanga, cuyos productos sufrieron muerte perinatal y otro grupo con productos vivos, procedentes de Lebrija Santander año 2004. Materiales y métodos: estudio de caso descriptivo, retrospectivo. De 15 muerte perinatal reportadas, sólo 7 cumplían criterios de inclusión. Por cada muerte perinatal, se seleccionaron por conveniencia, 3 madres con niños vivos. Las variables estudiadas, mediante frecuencia absoluta y relativa, fueron: Características de la madre, del niño, Oportunidad, Percepción de atención, Funcionalidad, Costos. Resultados: 6 muerte perinatal previsibles, 1 no previsible. 3 pertenecían al régimen subsidiado, 1 al contributivo, 3 no aseguradas. Se observó, falta de oportunidad para remisión de madres e intervención del parto. Mujeres con 3 ó más controles, presentaron mayor frecuencia relativa de muerte perinatal. También se observó insatisfacción en la percepción de atención, en 3 aspectos estudiados, en 3 niveles de atención. Discusión y Conclusiones: Implementar políticas encaminadas a mejorar la oportunidad de atención materna-perinatal, facilitando acceso oportuno para prestación de servicios de salud. Controles prenatales enfocados en búsqueda de factores relacionados con muerte perinatal. Fortalecer Sistemas de Vigilancia Epidemiológica y Centro Regulador de Urgencias. (Rev Cuid 2010;1(1:26-34.Palabras clave: Mortalidad perinatal, Accesibilidad, Servicios de Salud. (Fuente DeCs, BIREME.

  19. Manejo de conductos radiculares con curvatura marcada

    Directory of Open Access Journals (Sweden)

    Jorge Mario Nuñez Duran

    2013-10-01

    Full Text Available Las variaciones anatómicas en dientes con conductos que poseen dilaceraciones hacen del tratamiento de endodonciaun reto o una complicación relativa, en donde el clínico debe desarrollar toda su habilidad y el uso de instrumentosespeciales que faciliten u optimicen la terapia de conductos radiculares. La toma de radiografías previas con diferentesangulaciones y el estudio minucioso de ellas, darán una ayuda fundamental para conocer más detalladamente estacomplicación anatómica, que en algunos casos es muy frecuente. El uso de instrumental más flexible y resistentepermite llegar con mayor precisión y seguridad a la parte apical sin que se corra el riesgo de fracturar los instrumentos,limpiándolos y modelándolos en toda su extensión para poder obturarlos de una manera correcta.El uso de limas de menor calibre, precurvadas, permite acceder a la porción dilacerada de la raíz. Este es un métodoeficaz para prevenir la perdida de longitud de trabajo y evitar así las perforaciones de las raíces durante la preparación.Dentro de los errores más comunes durante la instrumentación de los conductos está la perdida de longitud detrabajo, junto con la transportación del foramen apical, ya sea de manera externa o interna. En el presente artículose menciona el uso de nuevas y mejores técnicas usadas para poder evitar este tipo de errores y se muestra un casoclínico del manejo de un molar superior con una curvatura de 40 grados que fue preparado y obturado exitosamentecon el sistema Protaper (Dentsply- maillefer.

  20. Ependimoma myxopapilar sacro gigante con osteolisis

    Science.gov (United States)

    Ajler, Pablo; Landriel, Federico; Goldschmidt, Ezequiel; Campero, Álvaro; Yampolsky, Claudio

    2014-01-01

    Objetivo: la presentación de un caso de una paciente con un ependimoma sacro con extensa infiltración y destrucción ósea local. Descripción del caso: una mujer de 53 años acudió a la consulta por dolor lumbosacro y alteraciones sensitivas perineales y esfinterianas. La imágenes por Resonancia Magnética (IRM) y la Tomografía Axial Computada (TAC) mostraron una lesión expansiva gigante a nivel S2-S4 con extensa osteólisis e invasión de tejidos adyacentes. Se realizó una exéresis tumoral completa con mejoría del estatus funcional. La anatomía patológica informó ependimoma mixopapilar. Discusión: la extensión de la resección quirúrgica es el mejor predictor de buen pronóstico. El tratamiento radiante se reserva como opción adyuvante para las resecciones incompletas y recidiva tumoral. La quimioterapia sólo debería utilizarse en casos en que la cirugía y la radioterapia estén contraindicadas. Conclusión: Los ependimomas mixopapilares sacros con destrucción ósea y presentación intra y extradural son muy infrecuentes y deben ser tenidos en cuenta entre los diagnósticos diferenciales preoperatorios. Su resección total, siempre que sea posible, es la mejor alternativa terapéutica. PMID:25165615

  1. Photobiomodulation in laser surgery

    Science.gov (United States)

    Liu, Timon Cheng-Yi; Rong, Dong-Liang; Huang, Jin; Deng, Xiao-Yuan; Liu, Song-Hao

    2006-01-01

    Laser surgery provides good exposure with clear operating fields and satisfactory preliminary functional results. In contrast to conventional excision, it was found that matrix metalloproteinases and the tissue inhibitors of metalloproteinases -1 mRNA expression is higher, myofibroblasts appeared and disappeared slower in laser excision wounds. It has been suggested that the better anatomical and functional results achieved following laser cordectomy may be explained by the fact that such procedures result in better, more rapid healing processes to recover vocal cord for early glottic tumors and better. In this paper, the role of photobiomodulation in laser surgery will be discussed by the cultured monolayer normal human skin fibroblast model of the photobiomodulation of marginal irradiation of high intensity laser beam, the photobiomodulation related to the irradiated tissue, the biological information model of photobiomodulation and the animal models of laser surgery. Although high intensity laser beam is so intense that it destroys the irradiated cells or tissue, its marginal irradiation intensity is so low that there is photobiomodulation on non-damage cells to modulate the regeneration of partly damaged tissue so that the surgery of laser of different parameters results in different post-surgical recovery. It was concluded that photobiomodulation might play an important role in the long-term effects of laser surgery, which might be used to design laser surgery.

  2. Frequency comb swept lasers.

    Science.gov (United States)

    Tsai, Tsung-Han; Zhou, Chao; Adler, Desmond C; Fujimoto, James G

    2009-11-09

    We demonstrate a frequency comb (FC) swept laser and a frequency comb Fourier domain mode locked (FC-FDML) laser for applications in optical coherence tomography (OCT). The fiber-based FC swept lasers operate at a sweep rate of 1kHz and 120kHz, respectively over a 135nm tuning range centered at 1310nm with average output powers of 50mW. A 25GHz free spectral range frequency comb filter in the swept lasers causes the lasers to generate a series of well defined frequency steps. The narrow bandwidth (0.015nm) of the frequency comb filter enables a approximately -1.2dB sensitivity roll off over approximately 3mm range, compared to conventional swept source and FDML lasers which have -10dB and -5dB roll offs, respectively. Measurements at very long ranges are possible with minimal sensitivity loss, however reflections from outside the principal measurement range of 0-3mm appear aliased back into the principal range. In addition, the frequency comb output from the lasers are equally spaced in frequency (linear in k-space). The filtered laser output can be used to self-clock the OCT interference signal sampling, enabling direct fast Fourier transformation of the fringe signals, without the need for fringe recalibration procedures. The design and operation principles of FC swept lasers are discussed and designs for short cavity lasers for OCT and interferometric measurement applications are proposed.

  3. Laser treatment in gynecology

    Science.gov (United States)

    de Riese, Cornelia

    2004-07-01

    This presentation is designed as a brief overview of laser use in gynecology, for non-medical researchers involved in development of new laser techniques. The literature of the past decade is reviewed. Differences in penetration, absorption, and suitable delivery media for the beams dictate clinical application. The use of CO2 laser in the treatment of uterine cervical intraepithelial lesions is well established and indications as well as techniques have not changed over 30 years. The Cochrane Systematic Review from 2000 suggests no obviously superior technique. CO2 laser ablation of the vagina is also established as a safe treatment modality for VAIN. CO2 laser permits treatment of lesions with excellent cosmetic and functional results. The treatment of heavy menstrual bleeding by destruction of the endometrial lining using various techniques has been the subject of a 2002 Cochran Database Review. Among the compared treatment modalities are newer and modified laser techniques. Conclusion by reviewers is that outcomes and complication profiles of newer techniques compare favorably with the gold standard of endometrial resection. The ELITT diode laser system is one of the new successful additions. CO2 laser is also the dominant laser type used with laparoscopy for ablation of endometriotic implants. Myoma coagulation or myolysis with Nd:Yag laser through the laparoscope or hysteroscope is a conservative treatment option. Even MRI guided percutaneous approaches have been described. No long-term data are available.

  4. Variables socionutricionales de hogares mazahuas integrados por preescolares desnutridos con madres con obesidad y sin obesidad

    OpenAIRE

    Viridiana Vanessa Conzuelo-González; Ivonne Vizcarra-Bordi

    2009-01-01

    El primer objetivo fue conocer cuántos menores de cinco años con diferentes grados de desnutrición tienen una madre con sobrepeso/obesidad/ en una comunidad indígena que vive en extrema pobreza y bajo condiciones de migración masculina internacional. El segundo fue comparar tres variables socionutricionales (ingreso familiar, educación de la madre y adecuación nutrimental de la dieta diaria) entre estos hogares y los hogares con desnutrición infantil y madres sin obesidad. Se realizó un est...

  5. Cambios psicológicos en pacientes con espondiloartritis axial tratados con infliximab

    OpenAIRE

    Morlà Novell, Rosa M.

    2015-01-01

    Es conocido que los pacientes con enfermedades reumáticas presentan alteraciones psicológicas relacionadas con su enfermedad articular crónica. Algunos estudios reportan el beneficio de las terapias biológicas en las espondiloartritis (EsP), pero son pocos los datos acerca del impacto de los fármacos biológicos en los síntomas psicológicos. El objetivo del estudio fue el de analizar la influencia del tratamiento con un fármaco biológico anti-TNFα, infliximab (IFX), en los síntomas de ansiedad...

  6. Terapias alternativas con animales para niños con necesidades especiales

    OpenAIRE

    Cea-Chueca, Aihnoa

    2014-01-01

    El presente trabajo de fin de grado consiste en la realización de un análisis y descripción de la literatura acerca de las distintas terapias animales, destinadas a niños con necesidades especiales: cómo y por qué surgieron, en qué consisten las terapias, cómo podemos utilizarlas, etc. Las terapias alternativas con animales se conocen como una alternativa terapéutica, donde se utiliza a un animal como co-terapeuta para poder desarrollar diferentes capacidades de los niños con necesidades espe...

  7. Dermatological laser treatment. Dermatologisk laserbehandling

    Energy Technology Data Exchange (ETDEWEB)

    Moerk, N.J.; Austad, J. (Rikshospitalet, Oslo (Norway)); Helland, S. (Haukeland Sykehus, Bergen (Norway)); Thune, P. (Ullevaal Sykehus, Oslo (Norway)); Volden, G. (University and Regional Hospital, Trondheim (Norway)); Falk, E. (University and Regional Hospital, Tromsoe (Norway))

    1991-10-01

    The article reviews the different lasers used in dermatology. Special emphasis is placed on the treatment of naevus flammeus (''portwine stain'') where lasers are the treatment of choice. Argon laser and pulsed dye laser are the main lasers used in vascular skin diseases, and the article focuses on these two types. Copper-vapour laser, neodymium-YAG laser and CO{sub 2} laser are also presented. Information is provided about the availability of laser technology in the different health regions in Norway. 5 refs., 2 figs.

  8. Tibio-talo-calcaneo fusion using a locked intramedullary compressive nail.

    Science.gov (United States)

    Krissen, Chettiar; Sumon, Halder; Nicholas, Bowman; Howard, Cottam; Andrew, Armitage; Andrew, Skyrme

    2011-12-01

    We present the clinical results and outcomes of 30 consecutive patients (31 ankles) who have undergone tibio-talo-calcaneal arthrodesis using an intramedullary nail to achieve bony union. This was a prospective study and surgery was performed by the senior author in a single hospital. We achieved high levels of satisfaction and outcome via the AOFAS and SF-36 scoring systems. We propose that this method of arthrodesis is reliable and easily reproducible for patients with severe arthritis and bone loss at the ankle and subtalar joints.

  9. [Excessively long calcaneal spur. A rudimentary form of calcaneo-navicular synostosis].

    Science.gov (United States)

    Hardy, J; Pouliquen, J C

    1983-01-01

    The authors have seen 5 children aged between 12 and 16 years suffering from a painful foot described as a recurrent sprain. Movements of the subtalar joint were limited and radiographs showed a hypertrophic calcaneal spur projecting towards the navicular but without fusion between the calcaneus and navicular. The calcaneal spurs were resected with good results and with an immediate symptomatic improvement.

  10. Lasers in Dermatology and Medicine

    CERN Document Server

    Nouri, Keyvan

    2012-01-01

    Laser technology is constantly evolving and progressing. The use of laser therapy is vastly expanding and for this reason a medical book of this magnitude is necessary. Lasers and Light Therapy includes an up-to-date comprehensive look at lasers and light therapy not only in the field of Cutaneous Laser Surgery, but in other medical specialties as well.

  11. Laser/tissue interaction.

    Science.gov (United States)

    Dederich, D N

    1991-01-01

    When laser light impinges on tissue, it can reflect, scatter, be absorbed, or transmit to the surrounding tissue. Absorption controls to a great degree the extent to which reflection, scattering and transmission occur, and wavelength is the primary determinant of absorption. The CO2 laser is consistently absorbed by most materials and tissues and the Nd-YAG laser wavelength is preferentially absorbed in pigmented tissues. The factors which determine the initial tissue effect include the laser wavelength, laser power, laser waveform, tissue optical properties, and tissue thermal properties. There are almost an infinite number of combinations of these factors possible, many of which would result in unacceptable damage to the tissues. This underscores the need to thoroughly test any particular combination of these factors on the conceptual, in-vitro, and in-vivo level before a treatment is offered.

  12. Principles of Lasers

    CERN Document Server

    Svelto, Orazio

    2010-01-01

    This new Fifth Edition of Principles of Lasers incorporates corrections to the previous edition. The text’s essential mission remains the same: to provide a wide-ranging yet unified description of laser behavior, physics, technology, and current applications. Dr. Svelto emphasizes the physical rather than the mathematical aspects of lasers, and presents the subject in the simplest terms compatible with a correct physical understanding. Praise for earlier editions: "Professor Svelto is himself a longtime laser pioneer and his text shows the breadth of his broad acquaintance with all aspects of the field … Anyone mastering the contents of this book will be well prepared to understand advanced treatises and research papers in laser science and technology." (Arthur L. Schawlow, 1981 Nobel Laureate in Physics) "Already well established as a self-contained introduction to the physics and technology of lasers … Professor Svelto’s book, in this lucid translation by David Hanna, can be strongly recommended for...

  13. Laser Cutting, Development Trends

    DEFF Research Database (Denmark)

    Olsen, Flemming Ove

    1999-01-01

    In this paper a short review of the development trends in laser cutting will be given.The technology, which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal, as it will expand in heavy industry and in cutting o...... of 3-dimensional shapes.The CO2-laser will also in the near future be the dominating laser source in the market, although the new developments in ND-YAG-lasers opens for new possibilities for this laser type.......In this paper a short review of the development trends in laser cutting will be given.The technology, which is the fastest expanding industrial production technology will develop in both its core market segment: Flat bed cutting of sheet metal, as it will expand in heavy industry and in cutting...

  14. Laser materials production

    Science.gov (United States)

    Gianinoni, I.; Musci, M.

    1985-09-01

    The characteristics and the perspectives of the new photochemical laser techniques for materials production will be briefly analysed and some recent experimental results both on large area deposition of thin films and on synthesis of powders will be reported. As an example of an IR laser process, the cw CO 2 laser-induced deposition of hydrogenated amorphous silicon will be described in some detail. The results of some UV experiments for semiconductor, metal and insulating film depositions will also be discussed. The features of the process for laser-driven synthesis of powders and the characteristics of the produced particles will be evidenced, and some of their technological applications will be outlined. The requirements of the laser sources suitable for this kind of applications are in general the same as in gas-phase laser chemistry, however it will be pointed out how some parameters are more significant for this specific use.

  15. Lasers Fundamentals and Applications

    CERN Document Server

    Thyagarajan, K

    2010-01-01

    Lasers: Fundamentals and Applications, serves as a vital textbook to accompany undergraduate and graduate courses on lasers and their applications. Ever since their invention in 1960, lasers have assumed tremendous importance in the fields of science, engineering and technology because of their diverse uses in basic research and countless technological applications. This book provides a coherent presentation of the basic physics behind the way lasers work, and presents some of their most important applications in vivid detail. After reading this book, students will understand how to apply the concepts found within to practical, tangible situations. This textbook includes worked-out examples and exercises to enhance understanding, and the preface shows lecturers how to most beneficially match the textbook with their course curricula. The book includes several recent Nobel Lectures, which will further expose students to the emerging applications and excitement of working with lasers. Students who study lasers, ...

  16. Nanofabrication with Pulsed Lasers

    Directory of Open Access Journals (Sweden)

    Kabashin AV

    2010-01-01

    Full Text Available Abstract An overview of pulsed laser-assisted methods for nanofabrication, which are currently developed in our Institute (LP3, is presented. The methods compass a variety of possibilities for material nanostructuring offered by laser–matter interactions and imply either the nanostructuring of the laser-illuminated surface itself, as in cases of direct laser ablation or laser plasma-assisted treatment of semiconductors to form light-absorbing and light-emitting nano-architectures, as well as periodic nanoarrays, or laser-assisted production of nanoclusters and their controlled growth in gaseous or liquid medium to form nanostructured films or colloidal nanoparticles. Nanomaterials synthesized by laser-assisted methods have a variety of unique properties, not reproducible by any other route, and are of importance for photovoltaics, optoelectronics, biological sensing, imaging and therapeutics.

  17. Lasers in periodontics

    Directory of Open Access Journals (Sweden)

    Sugumari Elavarasu

    2012-01-01

    Full Text Available Laser is one of the most captivating technologies in dental practice since Theodore Maiman in 1960 invented the ruby laser. Lasers in dentistry have revolutionized several areas of treatment in the last three and a half decades of the 20 th century. Introduced as an alternative to mechanical cutting device, laser has now become an instrument of choice in many dental applications. Evidence suggests its use in initial periodontal therapy, surgery, and more recently, its utility in salvaging implant opens up a wide range of applications. More research with better designs are a necessity before lasers can become a part of dental armamentarium. This paper gives an insight to laser in periodontics.

  18. Nuclear-pumped lasers

    CERN Document Server

    Prelas, Mark

    2016-01-01

    This book focuses on Nuclear-Pumped Laser (NPL) technology and provides the reader with a fundamental understanding of NPLs, a review of research in the field, and exploration of large scale NPL system design and applications. Early chapters look at the fundamental properties of lasers, nuclear-pumping and nuclear reactions that may be used as drivers for nuclear-pumped lasers. The book goes on to explore the efficient transport of energy from the ionizing radiation to the laser medium and then the operational characteristics of existing nuclear-pumped lasers. Models based on Mathematica, explanations and a tutorial all assist the reader’s understanding of this technology. Later chapters consider the integration of the various systems involved in NPLs and the ways in which they can be used, including beyond the military agenda. As readers will discover, there are significant humanitarian applications for high energy/power lasers, such as deflecting asteroids, space propulsion, power transmission and mining....

  19. Power Laser Ablation Symposia

    CERN Document Server

    Phipps, Claude

    2007-01-01

    Laser ablation describes the interaction of intense optical fields with matter, in which atoms are selectively driven off by thermal or nonthermal mechanisms. The field of laser ablation physics is advancing so rapidly that its principal results are seen only in specialized journals and conferences. This is the first book that combines the most recent results in this rapidly advancing field with authoritative treatment of laser ablation and its applications, including the physics of high-power laser-matter interaction. Many practical applications exist, ranging from inertial confinement fusion to propulsion of aerostats for pollution monitoring to laser ignition of hypersonic engines to laser cleaning nanoscale contaminants in high-volume computer hard drive manufacture to direct observation of the electronic or dissociative states in atoms and molecules, to studying the properties of materials during 200kbar shocks developed in 200fs. Selecting topics which are representative of such a broad field is difficu...

  20. A gas laser system

    Energy Technology Data Exchange (ETDEWEB)

    Sydzo, Y.; Norio, T.

    1984-04-02

    It is reported that an improved gas laser system with active medium circulation has been developed. The design of the gas laser is given in block diagram form, and its principle of operation is described in detail. The gaseous active medium flows through the inlet hole to the laser system, and is uniformly dispersed as it flows through the cylindrical diffuser. Thus, a near uniform distribution in the flow velocity of the gas flow in the laser discharge tube is achieved. The gas flow velocity along the edges of the discharge tube exceeds somewhat the flow velocity in the central section, which aids in generating and maintaining a stable and uniform pumping discharge. It is established experimentally that when using the proposed design, the parameters of the output emission from the gas laser are improved significantly. A relationship is given which demonstrates the near linear relationship between the pumping voltage and the output emission power from a gas laser.

  1. Esporotricosis cutánea diseminada con compromiso articular en una mujer con diabetes tipo 2

    Directory of Open Access Journals (Sweden)

    Sendy Solorzano

    Full Text Available La esporotricosis diseminada es una presentación infrecuente de esta micosis. Aunque ha sido descrita en sujetos inmunocompetentes, con frecuencia existe compromiso de la inmunidad mediada por células T. Reportamos el caso de una mujer con diabetes tipo 2 no controlada que desarrolló esporotricosis cutánea diseminada. El curso de la enfermedad presentó varias complicaciones que incluyeron hepatitis secundaria a itraconazol y artritis de la rodilla con cultivo positivo para Sporothrix schenckii durante el tratamiento con solución saturada de ioduro de potasio. La discusión del caso incluye aspectos de la patogénesis de la esporotricosis diseminada y el manejo de la infección y sus complicaciones.

  2. Esporotricosis cutánea diseminada con compromiso articular en una mujer con diabetes tipo 2

    Directory of Open Access Journals (Sweden)

    Sendy Solorzano

    2015-01-01

    Full Text Available La esporotricosis diseminada es una presentación infrecuente de esta micosis. Aunque ha sido descrita en sujetos inmunocompetentes, con frecuencia existe compromiso de la inmunidad mediada por células T. Reportamos el caso de una mujer con diabetes tipo 2 no controlada que desarrolló esporotricosis cutánea diseminada. El curso de la enfermedad presentó varias complicaciones que incluyeron hepatitis secundaria a itraconazol y artritis de la rodilla con cultivo positivo para Sporothrix schenckii durante el tratamiento con solución saturada de ioduro de potasio. La discusión del caso incluye aspectos de la patogénesis de la esporotricosis diseminada y el manejo de la infección y sus complicaciones.

  3. Laser In Veterinary Medicine

    Science.gov (United States)

    Newman, Carlton; Jaggar, David H.

    1982-12-01

    Lasers have been used for some time now on animals for experimental purposes prior to their use in human medical and surgical fields. However the use of lasers in veterinary medicine and surgery per se is a recent development. We describe the application of high and low intensity laser technology in a general overview of the current uses, some limitations to its use and future needs for future inquiry and development.

  4. Arduino based laser control

    OpenAIRE

    Bernal Muñoz, Ferran

    2015-01-01

    ARDUINO is a vey usefull platform for prototypes. In this project ARDUINO will be used for controling a Semiconductor Tuneable Laser. [ANGLÈS] Diode laser for communications control based on an Arduino board. Temperature control implementation. Software and hardware protection for the laser implementation. [CASTELLÀ] Control de un láser de comunicaciones ópticas desde el ordenador utilizando una placa Arduino. Implementación de un control de temperatura y protección software y hardware ...

  5. Laser cutting plastic materials

    Energy Technology Data Exchange (ETDEWEB)

    Van Cleave, R.A.

    1980-08-01

    A 1000-watt CO/sub 2/ laser has been demonstrated as a reliable production machine tool for cutting of plastics, high strength reinforced composites, and other nonmetals. More than 40 different plastics have been laser cut, and the results are tabulated. Applications for laser cutting described include fiberglass-reinforced laminates, Kevlar/epoxy composites, fiberglass-reinforced phenolics, nylon/epoxy laminates, ceramics, and disposable tooling made from acrylic.

  6. Precision laser aiming system

    Science.gov (United States)

    Ahrens, Brandon R.; Todd, Steven N.

    2009-04-28

    A precision laser aiming system comprises a disrupter tool, a reflector, and a laser fixture. The disrupter tool, the reflector and the laser fixture are configurable for iterative alignment and aiming toward an explosive device threat. The invention enables a disrupter to be quickly and accurately set up, aligned, and aimed in order to render safe or to disrupt a target from a standoff position.

  7. Laser precision microfabrication

    CERN Document Server

    Sugioka, Koji; Pique, Alberto

    2010-01-01

    Miniaturization and high precision are rapidly becoming a requirement for many industrial processes and products. As a result, there is greater interest in the use of laser microfabrication technology to achieve these goals. This book composed of 16 chapters covers all the topics of laser precision processing from fundamental aspects to industrial applications to both inorganic and biological materials. It reviews the sate of the art of research and technological development in the area of laser processing.

  8. Semiconductor laser. Halbleiterlaser

    Energy Technology Data Exchange (ETDEWEB)

    Wuenstel, K.; Gohla, B.; Tegude, F.; Luz, G.; Hildebrand, O.

    1987-08-27

    A highly modulable semiconductor laser and a process for its manufacture are described. The semiconductor laser has a substrate, a stack of semiconductor layers and electrical contacts. To reduce the capacity, the width of the stack of semiconductor layers is reduced at the sides by anisotropic etching. The electrical contacts are situated on the same side of the substrate and are applied in the same stage of the process. The semiconductor laser is suitable for monolithic integration in other components.

  9. A gas laser design

    Energy Technology Data Exchange (ETDEWEB)

    Syudzo, Y.; Nooya, Kh.

    1984-05-28

    A gas laser design that excludes direct contact between the gas medium and the atmosphere is proposed. The laser operates at a reduced gas pressure. After shutdown, a special system is used to increase the gas pressure inside the discharge chamber, which approaches atmospheric pressure. The laser employs an internal optical resonator. The electrical discharge which excites the gas medium originates from three electrodes located within the gas discharge tube.

  10. Lasers in Ophthalmology

    Institute of Scientific and Technical Information of China (English)

    1992-01-01

    In recent years,lasers have entered every fieldof medicine and especially so in ophthalmol-ogy.The scientific basis of lasers in ophthal-mology is based on three mechanisms:1.Photothermal effectLasers:argon,krypton,dye and diodeA thermal effect is generated when laserenergy is absorbed by pigment leading to in-creased vibration and therefore heat content.A

  11. DETERMINACION CUANTITATIVA DEL ESTADO ENERGETICO CON NEUROMETER EN PACIENTES Y CAMBIOS EN SU TRATAMIENTO CON ACUPUNTURA

    OpenAIRE

    RAMIREZ MONDRAGON, MERIT

    2009-01-01

    SE REALIZO ESTUDIO CLINICO INTERVENSIONISTA, DESCRIPTIVO, LONGITUDINAL, PROSPECTIVO, ABIERTO, TETRAETAPICO, PARA VER CAMBIOS ENERGETICOS DE 30 PACIENTES 22 MUJERES Y 8 HOMBRES TRATADOS CON ACUPUNTURA EN LA CLINICA DE ACUPUNTURA DEL HOSPITAL 20 DE NOVIEMBRE DEL ISSSTE. SE LES PRACTICO HISTORIA CLINICA Y MEDICION ENERGETICA CON EL NEUROMETRO PARA EVALUAR EL ESTADO ENERGETICO EL CUAL SE REPRESENTA EN UNA GRAFICA A PARTIR DE LOS VALORES TOMADOS DE LOS PUNTOS DE ACUPUNTURA DETERMINADOS POR EL...

  12. Estudio observacional prospectivo con insulina detemir en pacientes con diabetes mellitus tipo 2 mal controlados que inician por primer vez tratamiento con insulina (estudio SOLVE)

    OpenAIRE

    Domingo Orozco-Beltrán; Sara Artola-Menéndez

    2016-01-01

    Objetivo: Describir la experiencia en atención primaria con insulina detemir en pacientes con diabetes mellitus tipo 2 mal controlados con antidiabéticos orales que necesitan incorporar una insulina a su terapia antidiabética. Métodos: Estudio observacional prospectivo de 6 meses de seguimiento realizado en 10 países. En España participaron solo centros de atención primaria. Se reclutaron pacientes con diabetes mellitus tipo 2 mal controlados a cuyo tratamiento con antidiabéticos orales se...

  13. GRADO DE MICROFILTRACIÓN DENTINARIA EN RESINAS REALIZADAS CON ADHESIVO DE V GENERACIÓN CON Y SIN ACONDICIONAMIENTO CON CLORHEXIDINA AL 2%, ESTUDIO COMPARATIVO IN VITRO

    OpenAIRE

    CHINCHAY PORTALATINO, IRIS MARISOL

    2014-01-01

    El presente estudio tuvo como objetivo comparar el grado de microfiltración dentinaria de resinas realizadas con adhesivo de V generación con y sin el acondicionamiento con clorhexidina al 2%. En una muestra de 36 premolares se realizaron cavidades clase V de Kennedy, luego se dividieron en dos grupos; un grupo control en donde se acondicionó las cavidades con ácido fosfórico al 37%, posteriormente se aplicó un adhesivo de V generación seguido de la obturación con una resina compuesta, y un ...

  14. Prueba de inmunodifusión radial con hapteno nativo para diferenciar bovinos con revacunaciones repetidas con la cepa S19 de Brucella abortus

    OpenAIRE

    Esperanza González Miranda; Laura Hernández Andrade; Efrén Díaz Aparicio

    2006-01-01

    El objetivo del estudio fue establecer la capacidad de la inmunodifusión radial (IDR) con hapteno nativo, para diferenciar anticuerpos post-vacunales de anticuerpos por infección, en bovinos con revacunaciones repetidas de cepa S19. Se trabajó en un establo del estado de México, con presencia de abortos, retención de placenta, expulsiones y fetos momificados. Las becerras se vacunaban con dosis clásica de cepa S19 de B. abortus, y ya adultas revacunaciones anuales repetidas con dosis reducida...

  15. Calidad de vida relacionada con la salud en pacientes con enfermedad inflamatoria intestinal

    Directory of Open Access Journals (Sweden)

    R. López Cortés

    Full Text Available Fundamento. Determinar la calidad de vida relacionada con la salud en pacientes con enfermedad de Crohn y colitis ulcerosa, así como evaluar las diferencias en función del sexo, tipo de enfermedad y otras variables sociodemográficas. Método. Estudio observacional, descriptivo y transversal en 100 pacientes atendidos en el servicio de Digestivo del Complejo Hospitalario de Navarra. Se empleó un cuestionario con variables sociodemográficas y clínicas, además del Inflammatory Bowel Disease Questionnaire-32, en su versión adaptada al castellano, para medir la calidad de vida. Resultados. La media de la puntuación total del cuestionario de calidad vida es de 166 puntos (D.T.=40,06 sobre un máximo de 232. Se han hallado diferencias estadísticamente significativas en función del tipo de enfermedad (p=0,005 y el sexo (p=0,001. Conclusiones. Las personas con enfermedad de Crohn o sexo femenino perciben peor calidad de vida relacionada con la salud respecto a pacientes con colitis ulcerosa u hombres.

  16. Gigashot Optical Laser Demonstrator

    Energy Technology Data Exchange (ETDEWEB)

    Deri, R. J. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

    2015-10-13

    The Gigashot Optical Laser Demonstrator (GOLD) project has demonstrated a novel optical amplifier for high energy pulsed lasers operating at high repetition rates. The amplifier stores enough pump energy to support >10 J of laser output, and employs conduction cooling for thermal management to avoid the need for expensive and bulky high-pressure helium subsystems. A prototype amplifier was fabricated, pumped with diode light at 885 nm, and characterized. Experimental results show that the amplifier provides sufficient small-signal gain and sufficiently low wavefront and birefringence impairments to prove useful in laser systems, at repetition rates up to 60 Hz.

  17. Tunable Microfluidic Dye Laser

    DEFF Research Database (Denmark)

    Olsen, Brian Bilenberg; Helbo, Bjarne; Kutter, Jörg Peter

    2003-01-01

    We present a tunable microfluidic dye laser fabricated in SU-8. The tunability is enabled by integrating a microfluidic diffusion mixer with an existing microfluidic dye laser design by Helbo et al. By controlling the relative flows in the mixer between a dye solution and a solvent......, the concentration of dye in the laser cavity can be adjusted, allowing the wavelength to be tuned. Wavelength tuning controlled by the dye concentration was demonstrated with macroscopic dye lasers already in 1971, but this principle only becomes practically applicable by the use of microfluidic mixing...

  18. Principles of laser dynamics

    CERN Document Server

    Khanin, YI

    1995-01-01

    This monograph summarizes major achievements in laser dynamics over the past three decades. The book begins with two introductory Chapters. Chapter 1 offers general considerations on quantum oscillators, formulates the requirements for the laser key elements and shows how these requirements are met in different laser systems. The second Chapter proposes the mathematical models used in semiclassical laser theory, discusses the approximations and simplifications in particular cases, and specifies the range of applicability of these models. In Chapters 3-5 attention is given primarily to the stea

  19. High power lasers

    CERN Document Server

    Niku-Lari, A

    1989-01-01

    The use of lasers for the working and treatment of materials is becoming increasingly common in industry. However, certain laser applications, for example, in welding, cutting and drilling, are more widely exploited than others. Whilst the potential of lasers for the surface treatment of metals is well recognised, in practice, this particular application is a relative newcomer. The 24 papers in this volume present the latest research and engineering developments in the use of lasers for processes such as surface melting, surface alloying and cladding, and machining, as well as discussing th

  20. Introduction to laser technology

    CERN Document Server

    Hitz, C Breck; Hecht, Jeff

    2012-01-01

    The only introductory text on the market today that explains the underlying physics and engineering applicable to all lasersAlthough lasers are becoming increasingly important in our high-tech environment, many of the technicians and engineers who install, operate, and maintain them have had little, if any, formal training in the field of electro-optics. This can result in less efficient usage of these important tools. Introduction to Laser Technology, Fourth Edition provides readers with a good understanding of what a laser is and what it can and cannot do. The book explains what types of las.

  1. X-ray lasers

    CERN Document Server

    Elton, Raymond C

    2012-01-01

    The first in its field, this book is both an introduction to x-ray lasers and a how-to guide for specialists. It provides new entrants and others interested in the field with a comprehensive overview and describes useful examples of analysis and experiments as background and guidance for researchers undertaking new laser designs. In one succinct volume, X-Ray Lasers collects the knowledge and experience gained in two decades of x-ray laser development and conveys the exciting challenges and possibilities still to come._Add on for longer version of blurb_M>The reader is first introduced

  2. Dental lasers and science.

    Science.gov (United States)

    Zakariasen, K L; Dederich, D N

    1991-07-01

    We have attempted to accomplish two purposes in this article. First, we have presented the case that extensive scientific investigation must form the base of our profession, that it must be an ongoing, continuous process and that laser dentistry must be developed through extensive scientific inquiry--as all of our treatment modalities should be. Second, we have presented many examples of the science involved in the development of laser dentistry. Lasers do have far-reaching potential for application to dentistry. We, as a profession, must insist that such laser development is done properly, not foisted upon us based on anecdotal reports and incomplete research.

  3. Physics of semiconductor lasers

    CERN Document Server

    Mroziewicz, B; Nakwaski, W

    2013-01-01

    Written for readers who have some background in solid state physics but do not necessarily possess any knowledge of semiconductor lasers, this book provides a comprehensive and concise account of fundamental semiconductor laser physics, technology and properties. The principles of operation of these lasers are therefore discussed in detail with the interrelations between their design and optical, electrical and thermal properties. The relative merits of a large number of laser structures and their parameters are described to acquaint the reader with the various aspects of the semiconductor l

  4. Laser processing of materials

    Indian Academy of Sciences (India)

    J Dutta Majumdar; I Manna

    2003-06-01

    Light amplification by stimulated emission of radiation (laser) is a coherent and monochromatic beam of electromagnetic radiation that can propagate in a straight line with negligible divergence and occur in a wide range of wavelength, energy/power and beam-modes/configurations. As a result, lasers find wide applications in the mundane to the most sophisticated devices, in commercial to purely scientific purposes, and in life-saving as well as life-threatening causes. In the present contribution, we provide an overview of the application of lasers for material processing. The processes covered are broadly divided into four major categories; namely, laser-assisted forming, joining, machining and surface engineering. Apart from briefly introducing the fundamentals of these operations, we present an updated review of the relevant literature to highlight the recent advances and open questions. We begin our discussion with the general applications of lasers, fundamentals of laser-matter interaction and classification of laser material processing. A major part of the discussion focuses on laser surface engineering that has attracted a good deal of attention from the scientific community for its technological significance and scientific challenges. In this regard, a special mention is made about laser surface vitrification or amorphization that remains a very attractive but unaccomplished proposition.

  5. Trends in laser micromachining

    Science.gov (United States)

    Gaebler, Frank; van Nunen, Joris; Held, Andrew

    2016-03-01

    Laser Micromachining is well established in industry. Depending on the application lasers with pulse length from μseconds to femtoseconds and wavelengths from 1064nm and its harmonics up to 5μm or 10.6μm are used. Ultrafast laser machining using pulses with pico or femtosecond duration pulses is gaining traction, as it offers very precise processing of materials with low thermal impact. Large-scale industrial ultrafast laser applications show that the market can be divided into various sub segments. One set of applications demand low power around 10W, compact footprint and are extremely sensitive to the laser price whilst still demanding 10ps or shorter laser pulses. A second set of applications are very power hungry and only become economically feasible for large scale deployments at power levels in the 100+W class. There is also a growing demand for applications requiring fs-laser pulses. In our presentation we would like to describe these sub segments by using selected applications from the automotive and electronics industry e.g. drilling of gas/diesel injection nozzles, dicing of LED substrates. We close the presentation with an outlook to micromachining applications e.g. glass cutting and foil processing with unique new CO lasers emitting 5μm laser wavelength.

  6. Traducir utilizando Internet, Traducir con Speechy Project

    Directory of Open Access Journals (Sweden)

    Nicolás Fermín Pino James

    2011-06-01

    Full Text Available Speechy Project surgió el pasado otoño de 2009 con la intención de ayudar a estudiantes de nivel avanzado de lengua inglesa a sacarle partido a Internet. Desde entonces, este sitio web ha “tamizado” la red con el objetivo de seleccionar los mejores recursos online y clasificarlos ordenadamente en sus listas a posteriori.  En esta corriente, varias filtraciones se han llevado a cabo en diferentes campos de la lengua inglesa. Este artículo se centrará en el campo de la Traducción que se proyecta en Speechy Project como una organizada red cooperativa formada (y mantenida por seis voluntarios.

  7. VANET Routing Protocols: Pros and Cons

    CERN Document Server

    Paul, Bijan; Bikas, Md Abu Naser

    2012-01-01

    VANET (Vehicular Ad-hoc Network) is a new technology which has taken enormous attention in the recent years. Due to rapid topology changing and frequent disconnection makes it difficult to design an efficient routing protocol for routing data among vehicles, called V2V or vehicle to vehicle communication and vehicle to road side infrastructure, called V2I. The existing routing protocols for VANET are not efficient to meet every traffic scenarios. Thus design of an efficient routing protocol has taken significant attention. So, it is very necessary to identify the pros and cons of routing protocols which can be used for further improvement or development of any new routing protocol. This paper presents the pros and cons of VANET routing protocols for inter vehicle communication.

  8. Monitoreo de PostgreSQL con Munin

    Directory of Open Access Journals (Sweden)

    Gunnar Eyal Wolf Iszaevich

    2011-11-01

    Full Text Available Una de los principales tareas del trabajo diario de un administrador de sistemas, redes o bases de datos es el monitoreo de recursos. Con herramientas adecuadas de monitoreo, el administrador puede no sólo detectar un problema antes de que cause interrupciones en la operación de los sistemas, sino que puede prevenir que ocurran, conociendo la evolución histórica de los valores relevantes. En el presente trabajo presento el marco de recopilación y graficación de datos Munin, enfocándome a su uso para monitorear el gestor de base de datos relacional PostgreSQL, así como en la flexiblilidad y facilidad con que administradores y programadores pueden adecuarlo para desarrollar plugins específicos para el monitoreo de sus necesidades puntuales.

  9. Rabdomiolisis asociada al tratamiento con valaciclovir

    Directory of Open Access Journals (Sweden)

    Héctor Enríquez Gómez

    2012-03-01

    Full Text Available La rabdomiolisis es un efecto secundario asociado a un buen número de fármacos, entre ellos los antivirales. Describimos un caso de rabdomiolisis secundaria a valaciclovir, efecto no descrito anteriormente en laliteratura, en un contexto clínico muy especial. Se trata de un varón queingresa por un golpe de calor secundario a la realización de ejercicio físicoextremo. Durante su ingreso se comienza tratamiento con valaciclovir porun herpes nasolabial, observándose en los días siguientes una marcadaelevación de las cifras de CPK que desaparece con la suspensión del mismo. Proponemos, por tanto, que ante la administración de valaciclovir ensituaciones que puedan comportar daño mitocondrial habría que realizarmonitorización estrecha de los niveles de CPK

  10. Reclutando profesionales con deseos de empleo.

    Directory of Open Access Journals (Sweden)

    Teresa Farfán Cabrera

    2014-01-01

    Full Text Available En los últimos años la vinculación retórica de la globalización con el empleo ha creado una serie de retos y prejuicios respecto a la forma en que la primera ha afectado la organización y producción del conocimiento dentro de las instituciones de educación superior públicas, lo que llevó a tomar caminos separados, pero ya es tiempo de generar nuevas formas de acercamiento que vinculen a los profesionistas con el actual mercado laboral y sus formas de contratación como un ejerció donde ambas partes puedan generar soluciones a problemas comunes.

  11. Riesgos asociados con las radiaciones ionizantes

    Directory of Open Access Journals (Sweden)

    Adriana Cascón

    2009-01-01

    Full Text Available El uso médico de las radiaciones ionizantes implica ciertos riesgos, aunque están ampliamente compensados por sus beneficios diagnósticos y terapéuticos. No obstante, el conocimiento de esos riesgos, así como su diagnóstico y prevención, minimiza sus inconvenientes y optimiza la calidad y la seguridad de su empleo. En este artículo se discuten aspectos vinculados con la relación dosis-respuesta en la piel (efectos determinísticos, la importancia del límite de la dosis, la fisiopatología del daño biológico y, por último, con las medidas de prevención.REV ARGENT CARDIOL 2009;77:123-128.

  12. Laser processing with specially designed laser beam

    Science.gov (United States)

    Asratyan, A. A.; Bulychev, N. A.; Feofanov, I. N.; Kazaryan, M. A.; Krasovskii, V. I.; Lyabin, N. A.; Pogosyan, L. A.; Sachkov, V. I.; Zakharyan, R. A.

    2016-04-01

    The possibility of using laser systems to form beams with special spatial configurations has been studied. The laser systems applied had a self-conjugate cavity based on the elements of copper vapor lasers (LT-5Cu, LT-10Cu, LT-30Cu) with an average power of 5, 10, or 30 W. The active elements were pumped by current pulses of duration 80-100 ns. The duration of laser generation pulses was up to 25 ns. The generator unit included an unstable cavity, where one reflector was a special mirror with a reflecting coating. Various original optical schemes used were capable of exploring spatial configurations and energy characteristics of output laser beams in their interaction with micro- and nanoparticles fabricated from various materials. In these experiments, the beam dimensions of the obtained zones varied from 0.3 to 5 µm, which is comparable with the minimum permissible dimensions determined by the optical elements applied. This method is useful in transforming a large amount of information at the laser pulse repetition rate of 10-30 kHz. It was possible to realize the high-precision micromachining and microfabrication of microscale details by direct writing, cutting and drilling (with the cutting width and through-hole diameters ranging from 3 to 100 µm) and produce microscale, deep, intricate and narrow grooves on substrate surfaces of metals and nonmetal materials. This system is used for producing high-quality microscale details without moving the object under treatment. It can also be used for microcutting and microdrilling in a variety of metals such as molybdenum, copper and stainless steel, with a thickness of up to 300 µm, and in nonmetals such as silicon, sapphire and diamond with a thickness ranging from 10 µm to 1 mm with different thermal parameters and specially designed laser beam.

  13. Millisecond laser machining of transparent materials assisted by nanosecond laser.

    Science.gov (United States)

    Pan, Yunxiang; Zhang, Hongchao; Chen, Jun; Han, Bing; Shen, Zhonghua; Lu, Jian; Ni, Xiaowu

    2015-01-26

    A new form of double pulse composed of a nanosecond laser and a millisecond laser is proposed for laser machining transparent materials. To evaluate its advantages and disadvantages, experimental investigations are carried out and the corresponding results are compared with those of single millisecond laser. The mechanism is discussed from two aspects: material defects and effects of modifications induced by nanosecond laser on thermal stress field during millisecond laser irradiation. It is shown that the modifications of the sample generated by nanosecond laser improves the processing efficiency of subsequent millisecond laser, while limits the eventual size of modified region.

  14. Comunicándonos con las cosas

    Directory of Open Access Journals (Sweden)

    Miguel Delgado

    2009-09-01

    Full Text Available Tras la Web 2.0 y gracias a la colaboración entre las personas, Internet sigue creciendo y evolucionando, pero esta vez a través de los objetos. La siguiente evolución pretende que las personas puedan interactuar con las cosas de una forma inteligente mediante tecnologías ampliamente utilizadas como el teléfono móvil e Internet, y tecnologías que permitan etiquetar objetos.

  15. Biotransformacion de Residuos Lignocelulosicos con Hongos Pleurotus.

    OpenAIRE

    Grisel Maria Ortega Arias-Carbajal; Gloria Bueno García; Dionisio Betancourt Rodríguez; Ivis Álvarez; Ana Lidia González

    2005-01-01

    En los últimos años se han estudiado numerosos microorganismos capaces de degradar los componentes de las maderas, considerándose como agentes degradadores de la lignina en la naturaleza. Los hongos del grupo de Phanerochaete chrysosporium y otros basidiomicetos, que incluso pueden ser cultivados a escala comercial, como son los Agaricus bisporus y Pleurotus, ambos comestibles, metabolizan con cierta selectividad la fracción de lignina del complejo lignocelulósico dejando un residuo de pudric...

  16. El tratamiento del escleroma con autohemoterapia irradiada

    OpenAIRE

    Cleves Cucalon, Carlos A.

    2013-01-01

    En un artículo aparecido en la revista Anales de Otolaringología del año ,1949 y traducido para la revista de la Sociedad de Otorrino y Oftalmología, encontré una comunicación del Profesor Lewenfisz sobre los resultados obtenidos en pacientes, que sufrían de escleroma, al ser tratados con inyecciones de sangre irradiada.

  17. Bacteriemia en pacientes internados con celulitis

    Directory of Open Access Journals (Sweden)

    Juan S. Lasa

    2012-08-01

    Full Text Available La celulitis es una inflamación aguda de la dermis y tejido celular subcutáneo de causa bacteriana, que generalmente complica a heridas, úlceras y dermatosis, aunque de manera frecuente no existe sitio de entrada. Se recomienda la realización de cultivo de punción de piel y partes blandas (PPB. Los hemocultivos raramente dan resultados positivos. El objetivo de este trabajo fue determinar la prevalencia de bacteriemia en pacientes internados en nuestra institución con diagnóstico de celulitis. Se analizaron retrospectivamente los registros clínicos de los pacientes con este diagnóstico al ingreso entre junio de 2007 y marzo de 2010. Se evaluaron los datos poblacionales, presencia de comorbilidades, y resultados de los cultivos. En ese período, se internaron 140 pacientes con diagnóstico de celulitis y a todos ellos se les realizó hemocultivo y cultivos de PPB. Setenta y cuatro eran varones (52.8%. La edad promedio: 47.5 ± 19.7 años (rango 16-94. El 40% tuvo cultivos positivos de PPB, en los que el Staphylococcus aureus meticilino resistente (SAMR fue el germen más frecuentemente aislado (35.7%; la prevalencia de bacteriemia fue del 8.6%, en donde el germen más frecuente fue Streptoccocus Beta hemolítico, grupo G (33% del total de hemocultivos positivos. La bacteriemia se asoció significativamente a mayor estadía hospitalaria (10.5 ± 8.9 vs. 4.9 ± 6, p = 0.004. Se asoció con mayor riesgo de hemocultivo positivo a ser diabético, tener cultivo de PPB positivo, consumo de alcohol y/o enfermedad pulmonar obstructiva crónica.

  18. Tricentenario: Encuentro con zurbarán

    Directory of Open Access Journals (Sweden)

    Luis Navarro Garavito

    1964-12-01

    Full Text Available Este, hasta hace muy poco, desconocido español de la provincia de Extremadura ha sentado ahora sus reales, a tres siglos de su muerte, en el Casón del Buen Retiro de Madrid, donde le han precedido en estos últimos años conmemorativos de gloriosas resurrecciones Velázquez, Berruguete y también Sorolla, con solo un siglo a cuestas.

  19. Intervista con Fabiola Gianotti, Portavoce esperimento ATLAS

    CERN Multimedia

    CERN Video Productions

    2009-01-01

    Domande : 1. Come ci si sente come Portavoce di un grande esperimento internazionale come ATLAS nel momento in cui LHC sta per produrre i primi dati? 2. Il rivelatore è pronto per i dati? 3. Quindi l'anno di arresto non è stato inutile? 4. Cosca cisi può aspettare da LHC con l'energia di 3,5 TeV per fascio? 5. Cosa succederà il giorno delle prime collisioni in sala di controllo di ATLAS?

  20. Tratamiento de la osteoporosis grave con teriparatide

    Directory of Open Access Journals (Sweden)

    Marcelo A. Sarli

    2013-10-01

    Full Text Available El objetivo de este trabajo retrospectivo fue evaluar el tratamiento de la osteoporosis grave con teriparatide (PTH y comparar nuestros resultados con los publicados en la literatura médica. Se incluyeron cuarenta y seis pacientes, cuarenta y dos mujeres y cuatro varones, edad: 69.15 ± 9.43 años. Seis eran vírgenes de tratamiento y cuarenta tratados previamente con bisfosfonatos. Treinta y dos pacientes habían tenido 93 fracturas de las cuales 86 vertebrales. Cuarenta y seis recibieron PTH 6 meses, 29 pacientes durante 12 meses y 20 completaron los 18 meses sugeridos. La densidad mineral ósea (DMO de columna lumbar aumentó significativamente desde el primer control a los 6 meses (p < 0.0001. La DMO de cuello de fémur alcanzó un incremento significativo al final del tratamiento (p = 0.002. La osteocalcina aumentó significativamente al mes, seguido por el ß crosslaps (beta-CTx, prueba en suero al tercer mes y la fosfatasa alcalina ósea, regresando los marcadores de recambio óseo a niveles basales a los 18 meses. Las calcemias y las calciurias no se modificaron significativamente, pero 8 pacientes tuvieron hipercalcemias leves y tres hipercalciurias asintomáticas. El tratamiento fue bien tolerado y no se registraron efectos adversos graves que requirieran suspender el tratamiento. En conclusión, la PTH es una alternativa útil y segura para el tratamiento de la osteoporosis grave. Nuestros resultados concuerdan con los previamente publicados en la literatura médica.

  1. Comunicándonos con las cosas

    OpenAIRE

    Miguel Delgado; Sergio Ciruela; Nicolás Marín

    2009-01-01

    Tras la Web 2.0 y gracias a la colaboración entre las personas, Internet sigue creciendo y evolucionando, pero esta vez a través de los objetos. La siguiente evolución pretende que las personas puedan interactuar con las cosas de una forma inteligente mediante tecnologías ampliamente utilizadas como el teléfono móvil e Internet, y tecnologías que permitan etiquetar objetos.

  2. Laser Program annual report 1987

    Energy Technology Data Exchange (ETDEWEB)

    O' Neal, E.M.; Murphy, P.W.; Canada, J.A.; Kirvel, R.D.; Peck, T.; Price, M.E.; Prono, J.K.; Reid, S.G.; Wallerstein, L.; Wright, T.W. (eds.)

    1989-07-01

    This report discusses the following topics: target design and experiments; target materials development; laboratory x-ray lasers; laser science and technology; high-average-power solid state lasers; and ICF applications studies.

  3. Miasis en paciente con Carcinoma Basocelular

    Directory of Open Access Journals (Sweden)

    Dr. Hugo Pérez Vedia

    2012-12-01

    Full Text Available Paciente de sexo masculino, de 71 años de edad, proveniente de la provincia Chapare, Cochabamba, es remitido por sus familiares al servicio de Infectologíadel Hospital Obrero Nº2 Caja Nacional de Salud, tras presentar cuadro clínico de varios días de evolución, caracterizado por lesión ulcerada de bordes irregulares, con secreciónserosanguinolenta localizada en hemicara derecha, con extensión a tejidos profundos y destrucción ósea con pérdida del pabellón auricular derecho,destrucción de la fosa nasal derecha, exposición de globo ocular por destrucción de tejido,destrucción del paladar duro y blando del lado derecho, lengua saburral, faringe hiperémica,acompañado de dolor intenso y signos de un procesoinfeccioso-inflamatorio en la zona, además de presentar larvas en dicha lesión, y antecedentes de carcinoma basocelular de 20 añosde evolución.

  4. ORIENTACIONES CURRICULARES CON EL ENFOQUE CTS

    Directory of Open Access Journals (Sweden)

    Miguel Corchuelo

    2010-11-01

    Full Text Available Considerando que el propósito de la educación con un enfoque CTS propende por abordar problemas contextualizados socialmente, se busca construir una propuesta desde la práctica, con el fi n de fortalecer la formación para la participación ciudadana. Encontramos que abordar el tratamiento de las relaciones entre deporte, nutrición humana y motricidad convierte al cuerpo humano en un objeto de estudio vigente. En la ciudad de Popayán (Cauca, Colombia se vive una de las más altas tasas de bulimia y anorexia en adolescentes del país, al igual que de consumo de drogas ilícitas. Además, el bajo rendimiento de los deportistas caucanos en los últimos Juegos Nacionales, los casos de dopaje en atletas olímpicos, entre otros, abre interrogantes sobre la formación integral de nuestros estudiantes. Con el fi n de acercar la escuela a estas problemáticas locales y nacionales, se asume un trabajo interdisciplinario basado en la resolución de problemas socialmente relevantes. En esta oportunidad compartiremos los resultados del camino recorrido en torno a la pregunta: “El deporte: ¿emancipación o alienación?”.

  5. Solar radiation pumped solid state of lasers for Solar Power Satellites

    Energy Technology Data Exchange (ETDEWEB)

    Zhu, Ruiyi [New Jersey (United States)

    2000-07-01

    The Laser Solar Power Satellites (L-SPS) is the most promising way to overcome global energy and environmental and economical problems. The purpose was to use the favorable combination of solar radiation, modern lasers and the extremely promising phenomenon Optical Phase Conjugation (OPC). Direct conversion of solar energy to energy of a high-power laser beam has the advantage of high efficiency and precise energy transportation. In this paper, direct solar radiation pumping of the laser is compared with the pumping using the intermediate stage of the conversion of the solar radiation in electrical energy. Possible solid-state lasers that can be used in L-SPS are also discussed (including optical system and cooling system). [Spanish] Los Satelites de Energia Solar Laser (L-SPS) son la forma mas prometedora para contrarrestar los problemas globales de energia, ambientales y problemas economicos. El proposito fue el de usar la combinacion favorable de radiacion solar, laseres modernos y el fenomeno extremadamente prometedor de conjugacion de fase optica (OPC). La conversion directa de energia solar a energia de un rayo laser de alta potencia tiene la ventaja de la alta eficiencia y precision de la transportacion de la energia. En este documento la radiacion solar directa impulsada por el laser se compara con la impulsion usando el estado intermedio de conversion de la radiacion solar en energia electrica. Tambien se analizan los posibles laseres de estado solido que pueden usarse en L-SPS (incluyendo el sistema optico y el sistema de enfriamiento).

  6. Laser Stabilization with Laser Cooled Strontium

    DEFF Research Database (Denmark)

    Christensen, Bjarke Takashi Røjle

    The frequency stability of current state-of-the-art stabilized clock lasers are limited by thermal fluctuations of the ultra-stable optical reference cavities used for their frequency stabilization. In this work, we study the possibilities for surpassing this thermal limit by exploiting the nonli......The frequency stability of current state-of-the-art stabilized clock lasers are limited by thermal fluctuations of the ultra-stable optical reference cavities used for their frequency stabilization. In this work, we study the possibilities for surpassing this thermal limit by exploiting...... the nonlinear effects from coupling of an optical cavity to laser cooled atoms having a narrow transition linewidth. Here, we have realized such a system where a thermal sample of laser cooled strontium-88 atoms are coupled to an optical cavity. The strontium-88 atoms were probed on the narrow 1S0-3P1 inter......-combination line at 689 nm in a strongly saturated regime. The dynamics of the atomic induced phase shift and absorption of the probe light were experimentally studied in details with the purpose of applications to laser stabilization. The atomic sample temperature was in the mK range which brought this system out...

  7. Control de procesos de temple con láser mediante dispositivos pirométricos

    Directory of Open Access Journals (Sweden)

    Molpeceres, C.

    2002-06-01

    Full Text Available In this work, a detailed description of an on-line control system for laser heat treatments based on pyrometric monitorization, is presented. The study includes full details concerning monitorization devices and comprehensive description of the control loop, based on a direct synthesis regulator. The system validation and exportable character of the proposed method are also discussed. Finally, results obtained for CO2 laser transformation hardening of F-114 steel are analyzed, including parametric analysis of control variables through metallurgical testing of the treated material.

    Se presenta un sistema de regulación en tiempo real del temple de aceros con láser basado en el empleo de dispositivos pirométricos de radiación. Se incluye una descripción completa del dispositivo de monitorización junto con un análisis detallado del bucle de control, basado en un regulador por síntesis directa y su validación, especificando su concepción flexible y exportable a otro tipo de sistemas y tratamientos láser diferentes al empleado en el presente trabajo. Finalmente, se analizan los resultados obtenidos aplicando el sistema en procesos reales de temple superficial en acero F-114, incluyendo un estudio paramétrico de las posibles variables de control a través de ensayos de dureza y profundidad de temple de las probetas tratadas.

  8. High-power pulsed lasers

    Energy Technology Data Exchange (ETDEWEB)

    Holzrichter, J.F.

    1980-04-02

    The ideas that led to the successful construction and operation of large multibeam fusion lasers at the Lawrence Livermore Laboratory are reviewed. These lasers are based on the use of Nd:glass laser materials. However, most of the concepts are applicable to any laser being designed for fusion experimentation. This report is a summary of lectures given by the author at the 20th Scottish University Summer School in Physics, on Laser Plasma Interaction. This report includes basic concepts of the laser plasma system, a discussion of lasers that are useful for short-pulse, high-power operation, laser design constraints, optical diagnostics, and system organization.

  9. Laser safety tools and training

    CERN Document Server

    Barat, Ken

    2008-01-01

    Lasers perform many unique functions in a plethora of applications, but there are many inherent risks with this continually burgeoning technology. Laser Safety: Tools and Training presents simple, effective ways for users in a variety of facilities to evaluate the hazards of any laser procedure and ensure they are following documented laser safety standards.Designed for use as either a stand-alone volume or a supplement to Laser Safety Management, this text includes fundamental laser and laser safety information and critical laser use information rarely found in a single source. The first lase

  10. Coatings of metal substrates assisted by laser radiation

    Directory of Open Access Journals (Sweden)

    Caudevilla, H.

    1998-04-01

    Full Text Available In this contribution, a new way of obtaining ceramic coatings is presented. This method uses precursor suspensions, settled on substrates and in-situ pyrolised with a laser. Different deposition techniques of the ceramic precursors have been tested in order to obtain a homogeneous distribution on the metal substrate before the laser treatment.

    La combinación de recubrimientos utilizando disoluciones de precursores metálicos con la pirólisis asistida por láser, permite obtener una gran diversidad de recubrimientos sobre sustratos de muy distinta naturaleza. Se han realizado estudios, tanto con disoluciones poliméricas, como con disoluciones de tipo sol-gel y pastas obtenidas con técnicas similares, depositadas utilizando métodos convencionales de inmersión y atomización previa a la pirólisis asistida por láser, así como simultánea. En este trabajo se presenta un resumen de los resultados más significativos obtenidos en la realización de recubrimientos sobre sustratos metálicos y cerámicos.

  11. Experiencias de familias que conviven con una persona con diagnóstico de Alzheimer

    Directory of Open Access Journals (Sweden)

    Viriam Leiva Díaz

    2015-12-01

    Full Text Available Introducción. La demencia tipo Alzheimer es un trastorno neurológico progresivo y degenerativo que afecta principalmente el pensamiento, la memoria y el comportamiento; su evolución es lenta y los daños que produce,  severos. Actualmente la enfermedad no tiene cura: el tratamiento consiste en aminorar los síntomas y retrasar el proceso degenerativo. El objetivo principal de esta investigación es analizar las experiencias de las familias que viven con una persona con Alzheimer, sustentada en la teoría de Imogene King.Metodología. El estudio requirió una aproximación cualitativa fenomenológica. La muestra utilizada incluye tres familias, cada una con un miembro que padece dicha enfermedad. Para la recolección de los datos se aplicó la entrevista a profundidad y la observación, así como otros instrumentos como genograma familiar y APGAR I y II.Resultados. Al analizar los datos, en las familias se identificó cambios en el sistema personal, interpersonal y el sistema social.Conclusión. Es importante reconocer la lucha de estas familias al convivir con una persona con la enfermedad de Alzheimer, lo cual implica no solo  cambios, sino desafíos, además de un reajuste y una reestructuración de sus sistemas con el fin de cumplir con sus nuevas necesidades.

  12. CO2 laser resurfacing.

    Science.gov (United States)

    Fitzpatrick, R E

    2001-07-01

    The CO2 Laser offers a variety of unique features in resurfacing facial photodamage and acne scarring. These include hemostasis, efficient removal of the epidermis in a single pass, thermally induced tissue tightening, and safe, predictable tissue interaction. Knowledge of these mechanisms will result in the capability of using the CO2 laser effectively and safely whether the goal is superficial or deep treatment.

  13. Levitated droplet dye laser

    DEFF Research Database (Denmark)

    Azzouz, H.; Alkafadiji, L.; Balslev, Søren

    2006-01-01

    a high quality optical resonator. Our 750 nL lasing droplets consist of Rhodamine 6G dissolved in ethylene glycol, at a concentration of 0.02 M. The droplets are optically pumped at 532 nm light from a pulsed, frequency doubled Nd:YAG laser, and the dye laser emission is analyzed by a fixed grating...

  14. Laser spectroscopy of protonium

    CERN Document Server

    Hayano, R S

    1999-01-01

    High-precision laser spectroscopy of protonium (pp) is one of the future experiments being considered by ASACUSA collaboration at CERN AD. A possible scheme to produce protonium in vacuum and to detect laser transitions is presented, and implications of reaching high precision are discussed. (7 refs).

  15. Liquid heat capacity lasers

    Science.gov (United States)

    Comaskey, Brian J.; Scheibner, Karl F.; Ault, Earl R.

    2007-05-01

    The heat capacity laser concept is extended to systems in which the heat capacity lasing media is a liquid. The laser active liquid is circulated from a reservoir (where the bulk of the media and hence waste heat resides) through a channel so configured for both optical pumping of the media for gain and for light amplification from the resulting gain.

  16. Lasers, A Bibliography.

    Science.gov (United States)

    1979-09-02

    TA1675 Muncheryan , Hrand 14. Laser Fundamentals and Applications, 1486 Indianapolis , IN: H.W. Sams , c1975 . 2...Francisco , CA: the cmd , 1970. • TK787 1.3 Van Pelt , W.F . , et al . Laser Fundamentals and Experiments . US Washington , DC: U.S. Bur of Radiological

  17. Learning about Lasers

    Science.gov (United States)

    Roberts, Larry

    2011-01-01

    The word laser is an acronym. It stands for Light Amplification by Stimulated Emission of Radiation. Lasers, invented in 1958, are used to cut and fuse materials, accurately survey long distances, communicate across fiber-optic phone lines, produce 3D pictures, make special effects, help navigation, and read bar codes for cash registers. A laser…

  18. Exciton laser rate equations

    Directory of Open Access Journals (Sweden)

    Garkavenko A. S.

    2011-08-01

    Full Text Available The rate equations of the exciton laser in the system of interacting excitons have been obtained and the inverted population conditions and generation have been derived. The possibility of creating radically new gamma-ray laser has been shown.

  19. Dielectric laser accelerators

    Science.gov (United States)

    England, R. Joel; Noble, Robert J.; Bane, Karl; Dowell, David H.; Ng, Cho-Kuen; Spencer, James E.; Tantawi, Sami; Wu, Ziran; Byer, Robert L.; Peralta, Edgar; Soong, Ken; Chang, Chia-Ming; Montazeri, Behnam; Wolf, Stephen J.; Cowan, Benjamin; Dawson, Jay; Gai, Wei; Hommelhoff, Peter; Huang, Yen-Chieh; Jing, Chunguang; McGuinness, Christopher; Palmer, Robert B.; Naranjo, Brian; Rosenzweig, James; Travish, Gil; Mizrahi, Amit; Schachter, Levi; Sears, Christopher; Werner, Gregory R.; Yoder, Rodney B.

    2014-10-01

    The use of infrared lasers to power optical-scale lithographically fabricated particle accelerators is a developing area of research that has garnered increasing interest in recent years. The physics and technology of this approach is reviewed, which is referred to as dielectric laser acceleration (DLA). In the DLA scheme operating at typical laser pulse lengths of 0.1 to 1 ps, the laser damage fluences for robust dielectric materials correspond to peak surface electric fields in the GV /m regime. The corresponding accelerating field enhancement represents a potential reduction in active length of the accelerator between 1 and 2 orders of magnitude. Power sources for DLA-based accelerators (lasers) are less costly than microwave sources (klystrons) for equivalent average power levels due to wider availability and private sector investment. Because of the high laser-to-particle coupling efficiency, required pulse energies are consistent with tabletop microJoule class lasers. Combined with the very high (MHz) repetition rates these lasers can provide, the DLA approach appears promising for a variety of applications, including future high-energy physics colliders, compact light sources, and portable medical scanners and radiative therapy machines.

  20. Microfluidic Dye Lasers

    DEFF Research Database (Denmark)

    Kristensen, Anders; Balslev, Søren; Gersborg-Hansen, Morten

    2006-01-01

    A technology for miniaturized, polymer based lasers, suitable for integration with planar waveguides and microfluidic networks is presented. The microfluidic dye laser device consists of a microfluidic channel with an embedded optical resonator. The devices are fabricated in a thin polymer film...

  1. Laser hair removal pearls.

    Science.gov (United States)

    Tierney, Emily P; Goldberg, David J

    2008-03-01

    A number of lasers and light devices are now available for the treatment of unwanted hair. The goal of laser hair removal is to damage stem cells in the bulge of the follicle through the targeting of melanin, the endogenous chromophore for laser and light devices utilized to remove hair. The competing chromophores in the skin and hair, oxyhemoglobin and water, have a decreased absorption between 690 nm and 1000 nm, thus making this an ideal range for laser and light sources. Pearls of laser hair removal are presented in this review, focusing on four areas of recent development: 1 treatment of blond, white and gray hair; 2 paradoxical hypertrichosis; 3 laser hair removal in children; and 4 comparison of lasers and IPL. Laser and light-based technologies to remove hair represents one of the most exciting areas where discoveries by dermatologists have led to novel treatment approaches. It is likely that in the next decade, continued advancements in this field will bring us closer to the development of a more permanent and painless form of hair removal.

  2. Athermal laser launch telescopes

    NARCIS (Netherlands)

    Kamphues, F.G.; Henselmans, R.; Rijnveld, N.; Lemmen, M.H.J.; Doelman, N.J.; Nijkerk, M.D.

    2011-01-01

    ESO has developed a concept for a compact laser guide star unit for use in future Adaptive Optics (AO) systems. A small powerful laser is combined with a telescope that launches the beam, creating a single modular unit that can be mounted directly on a large telescope. This approach solves several o

  3. Tribological behaviour of line hardening of steel U13A with Nd: YAG laser

    Directory of Open Access Journals (Sweden)

    Sagaro, R.

    1999-06-01

    Full Text Available To diminish wear in tribological systems is frequently to harden locally the load carrying areas, which are subjected to wear. A Nd:YAG laser was used for the improvement of hardness and wear resistance of steel U13A. The friction and wear characteristics of steel U13A in sliding contact against steel 65MN4 under unlubricated conditions were evaluated for conventional treatments and after laser irradiation. In addition the transformations occurring during laser treatments and the influence of laser parameters for quenching on tribological characteristics are presented. The experimental work indicates that wear resistance of steel U13A (AISI Wl 12 is several times higher then that for conventional heat treatments.

    Para disminuir el desgaste en los sistemas tribológicos frecuentemente se llevan a cabo endurecimientos localizados en aquellas áreas sometidas a esfuerzos y que están sujetas a desgaste. En el trabajo se presenta el endurecimiento y el incremento de la resistencia al desgaste del acero U13A, empleando un láser de Nd: YAG. Se evalúan las características de fricción y desgaste del acero U13A en contacto deslizante con el acero 65MN4 bajo condiciones de fricción seca para muestras con tratamientos térmicos convencionales y luego del tratamiento con láser. Se presentan además las transformaciones estructurales que tienen lugar durante el tratamiento con láser, así como la influencia de los parámetros operacionales del láser en las características tribológicas. Todo el trabajo experimental muestra un incremento de la resistencia al desgaste del acero U13A (AISI W112 con tratamiento térmico superficial con láser comparativamente con los tratamientos térmicos convencionales.

  4. Regenerative similariton laser

    Directory of Open Access Journals (Sweden)

    Thibault North

    2016-05-01

    Full Text Available Self-pulsating lasers based on cascaded reshaping and reamplification (2R are capable of initiating ultrashort pulses despite the accumulation of large amounts of nonlinearities in all-fiber resonators. The spectral properties of pulses in self-similar propagation are compatible with cascaded 2R regeneration by offset filtering, making parabolic pulses suitable for the design of a laser of this recently introduced class. A new type of regenerative laser giving birth to similaritons is numerically investigated and shows that this laser is the analog of regenerative sources based solely on self-phase modulation and offset filtering. The regenerative similariton laser does not suffer from instabilities due to excessive nonlinearities and enables ultrashort pulse generation in a simple cavity configuration.

  5. Airclad fiber laser technology

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2008-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last five years, and many of the traditional manufactures of gas and solid-state lasers are pursuing the attractive fiber-based systems, which are now displacing the old technology in many areas. High-power fiber laser...... laser system. We present the latest advancements within airclad fiber technology including a new 70 μm single-mode polarization-maintaining rod-type fiber capable of amplifying to MW power levels. Furthermore we describe the novel airclad based pump combiners and their use in a completely monolithic 350...... W CW fiber laser system with an M2 of less than 1.1. Finally, we briefly touch upon the subject of photo darkening and its origin....

  6. Laser Beam Focus Analyser

    DEFF Research Database (Denmark)

    Nielsen, Peter Carøe; Hansen, Hans Nørgaard; Olsen, Flemming Ove

    2007-01-01

    The quantitative and qualitative description of laser beam characteristics is important for process implementation and optimisation. In particular, a need for quantitative characterisation of beam diameter was identified when using fibre lasers for micro manufacturing. Here the beam diameter limits...... the obtainable features in direct laser machining as well as heat affected zones in welding processes. This paper describes the development of a measuring unit capable of analysing beam shape and diameter of lasers to be used in manufacturing processes. The analyser is based on the principle of a rotating...... mechanical wire being swept through the laser beam at varying Z-heights. The reflected signal is analysed and the resulting beam profile determined. The development comprised the design of a flexible fixture capable of providing both rotation and Z-axis movement, control software including data capture...

  7. Multispot fiber laser welding

    DEFF Research Database (Denmark)

    Schutt Hansen, Klaus

    This dissertation presents work and results achieved in the field of multi beam fiber laser welding. The project has had a practical approach, in which simulations and modelling have been kept at a minimum. Different methods to produce spot patterns with high power single mode fiber lasers have...... been possible to control the welding width in incremental steps by adding more beams in a row. The laser power was used to independently control the keyhole and consequently the depth of fusion. An example of inline repair of a laser weld in butt joint configuration was examined. Zinc powder was placed...... in the weld causing expulsion of the melt pool. Trailing beams were applied to melt additional material and ensure a melt pool. The method showed good results for increasing tolerances to impurities and reduction of scrapped parts from blowouts during laser welding....

  8. Airclad fiber laser technology

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2011-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last 5 years. Many of the traditional manufacturers of gas and solid-state lasers are now pursuing the fiber-based systems, which are displacing the conventional technology in many areas. High-power fiber laser systems...... laser system. We present the latest advancements within airclad fiber technology including a new 100 m single-mode polarization-maintaining rod-type fiber capable of amplifying to megawatt power levels. Furthermore, we describe the novel airclad-based pump combiners and their use in a completely...... monolithic 350 W cw fiber laser system with an M2 of less than 1.1. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)....

  9. Auricular Acupuncture with Laser

    Directory of Open Access Journals (Sweden)

    Regina Round

    2013-01-01

    Full Text Available Auricular acupuncture is a method which has been successfully used in various fields of medicine especially in the treatment of pain relief. The introduction of lasers especially low-level lasers into medicine brought besides the already existing stimulation with needles and electricity an additional technique to auricular acupuncture. This literature research looks at the historical background, the development and the anatomical and neurological aspects of auricular acupuncture in general and auricular laser acupuncture in detail. Preliminary scientific findings on auricular acupuncture with laser have been described in detail and discussed critically in this review article. The results of the studies have shown evidence of the effect of auricular laser acupuncture. However, a comparison of these studies was impossible due to their different study designs. The most important technical as well as study parameters were described in detail in order to give more sufficient evidence and to improve the quality of future studies.

  10. Solid State Laser

    Science.gov (United States)

    1990-01-01

    The Titan-CW Ti:sapphire (titanium-doped sapphire) tunable laser is an innovation in solid-state laser technology jointly developed by the Research and Solid State Laser Divisions of Schwartz Electro-optics, Inc. (SEO). SEO is producing the laser for the commercial market, an outgrowth of a program sponsored by Langley Research Center to develop Ti:sapphire technology for space use. SEO's Titan-CW series of Ti:sapphire tunable lasers have applicability in analytical equipment designed for qualitative analysis of carbohydrates and proteins, structural analysis of water, starch/sugar analyses, and measurements of salt in meat. Further applications are expected in semiconductor manufacture, in medicine for diagnosis and therapy, and in biochemistry.

  11. Photonic Crystal Microchip Laser

    Science.gov (United States)

    Gailevicius, Darius; Koliadenko, Volodymyr; Purlys, Vytautas; Peckus, Martynas; Taranenko, Victor; Staliunas, Kestutis

    2016-09-01

    The microchip lasers, being very compact and efficient sources of coherent light, suffer from one serious drawback: low spatial quality of the beam strongly reducing the brightness of emitted radiation. Attempts to improve the beam quality, such as pump-beam guiding, external feedback, either strongly reduce the emission power, or drastically increase the size and complexity of the lasers. Here it is proposed that specially designed photonic crystal in the cavity of a microchip laser, can significantly improve the beam quality. Experiments show that a microchip laser, due to spatial filtering functionality of intracavity photonic crystal, improves the beam quality factor M2 reducing it by a factor of 2, and increase the brightness of radiation by a factor of 3. This comprises a new kind of laser, the “photonic crystal microchip laser”, a very compact and efficient light source emitting high spatial quality high brightness radiation.

  12. Ceramic laser materials

    Science.gov (United States)

    Ikesue, Akio; Aung, Yan Lin

    2008-12-01

    The word 'ceramics' is derived from the Greek keramos, meaning pottery and porcelain. The opaque and translucent cement and clay often used in tableware are not appropriate for optical applications because of the high content of optical scattering sources, that is, defects. Recently, scientists have shown that by eliminating the defects, a new, refined ceramic material - polycrystalline ceramic - can be produced. This advanced ceramic material offers practical laser generation and is anticipated to be a highly attractive alternative to conventional glass and single-crystal laser technologies in the future. Here we review the history of the development of ceramic lasers, the principle of laser generation based on this material, some typical results achieved with ceramic lasers so far, and discuss the potential future outlook for the field.

  13. Discrete Thermodynamics of Lasers

    CERN Document Server

    Zilbergleyt, B

    2007-01-01

    The paper offers a discrete thermodynamic model of lasers. Laser is an open system; its equilibrium is based on a balance of two thermodynamic forces, one related to the incoming pumping power and another to the emitted light. The basic expression for such equilibrium is a logistic map, graphical solutions to which are pitchfork bifurcation diagrams. As pumping force increases, the relative populations on the ground and lasing branches tend to zero and unity correspondingly. An interesting feature of this model is the line spectrum of the up and down transitions between the branches beyond bifurcation point. Even in a simple case of 2-level laser with only 2 possible transition types (up and down), the spectra look like sets of the line packets, starting well before the population inversion. This effect is an independent confirmation of the Einstein's prohibition on practical realization of 2-level laser. Multilevel lasers may be approached by employing the idea of thermodynamic activity for the emitting atom...

  14. Femtosecond Laser Filamentation

    CERN Document Server

    Chin, See Leang

    2010-01-01

    Femtosecond Laser Filamentation gives a comprehensive review of the physics of propagation of intense femtosecond laser pulses in optical media (principally air) and the applications and challenges of this new technique. This book presents the modern understanding of the physics of femtosecond laser pulse propagation, including unusual new effects such as the self-transformation of the pulse into a white light laser pulse, intensity clamping, the physics of multiple filamentation and competition, and how filaments’ ability to melt glass leads to wave guide writing. The potential applications of laser filamentation in atmospheric sensing and the generation of other electromagnetic pulses from the UV to the radio frequency are treated, together with possible future challenges in the excitation of super-excited states of molecules. Exciting new phenomena such as filament induced ultrafast birefringence and the excitation of molecular rotational wave packets and their multiple revivals in air (gases) will also ...

  15. Dark state lasers

    CERN Document Server

    Gentry, Cale M

    2014-01-01

    We propose a new type of laser resonator based on imaginary "energy-level splitting" (imaginary coupling, or quality factor Q splitting) in a pair of coupled microcavities. A particularly advantageous arrangement involves two microring cavities with different free-spectral ranges (FSRs) in a configuration wherein they are coupled by "far-?field" interference in a shared radiation channel. A novel Vernier-like effect for laser resonators is designed where only one longitudinal resonant mode has a lower loss than the small signal gain and can achieve lasing while all other modes are suppressed. This configuration enables ultra-widely tunable single-frequency lasers based on either homogeneously or inhomogeneously broadened gain media. The concept is an alternative to the common external cavity configurations for achieving tunable single-mode operation in a laser. The proposed laser concept builds on a high-Q "dark state" that is established by radiative interference coupling and bears a direct analogy to parity...

  16. NASA Space Laser Technology

    Science.gov (United States)

    Krainak, Michael A.

    2015-01-01

    Over the next two decades, the number of space based laser missions for mapping, spectroscopy, remote sensing and other scientific investigations will increase several fold. The demand for high wall-plug efficiency, low noise, narrow linewidth laser systems to meet different systems requirements that can reliably operate over the life of a mission will be high. The general trends will be for spatial quality very close to the diffraction limit, improved spectral performance, increased wall-plug efficiency and multi-beam processing. Improved spectral performance will include narrower spectral width (very near the transform limit), increased wavelength stability and or tuning (depending on application) and lasers reaching a wider range of wavelengths stretching into the mid-infrared and the near ultraviolet. We are actively developing high efficiency laser transmitter and high-sensitivity laser receiver systems that are suitable for spaceborne applications.

  17. A gas laser

    Energy Technology Data Exchange (ETDEWEB)

    Sydzo, Y.

    1984-03-27

    It is reported that an improved design of a discharge tube for a gas laser is developed. A schematic of the discharge tube is given and its principle of operation is described in detail. In order to improve the flow of the gaseous active substance, it is proposed that tow additional incoming channels be used which are located between the primary incoming channels and the gas laser mirrors. The use of the additional incoming channels provides better circulation of the active medium in the regions near the laser mirrors. Thus, a more uniform heating of the region near the discharge tube is achieved due to the heat liberated from pumping discharge. It is noted that the proposed design serves to reduce the thermal deformation to the mirrors in the gas laser, and improves the laser efficiency.

  18. Laser-diode pumped Nd:YAG lasers; Laser diode reiki Nd:YAG lasear

    Energy Technology Data Exchange (ETDEWEB)

    Yuasa, H.; Akiyama, Y.; Nakayama, M. [Toshiba Corp., Tokyo (Japan)

    2000-04-01

    Laser-diode pumped Nd:YAG lasers are expected to be applied to laser processing fields such as welding, cutting, drilling, and marking due to their potential for high efficiency and compactness. We are designing and developing laser-diode pumped Nd:YAG lasers using numerical analysis simulation techniques such as ray tracing and thermal analysis. We have succeeded in achieving a laser power of more than 3 kW with 20% efficiency, which is the best ever obtained. In addition, we have developed a laser-diode pumped green laser by second harmonic generation, for precision machining on silicon wafers. (author)

  19. Laser conservation paleontology

    Science.gov (United States)

    Asmus, John F.

    2001-10-01

    Just as lasers have found countless applications in science, industry, medicine, and entertainment, an array of real and potential uses for lasers in art-conservation analytes and practice have been investigated over the past thirty years. These include holographic recording, holographic recording, holographic nondestructive testing, laser-induced ultrasonic imaging, laser-scattering surface characterization, atomic and molecular analyses, photoacoustic spectroscopy, surface modification, as well as surface divestment and cleaning. The initial endeavors in exploring and assessing the utility of these tools for art conservation are recounted for investigations involving ruby, glass, ion, YAG, carbon dioxide, dye, and excimer lasers as well as high-intensity nonlaser light generators such as xenon flashlamps and argon pinchlamps. Initially, laser divestment/cleaning was, by general consensus, the least plausible laser application in art conservation. In the past ten years it has emerged to dominate all the other applications noted above. Today, at least a dozen firms supply user-friendly laser systems optimized for a range of art-conservation divestment applications. The first-generation laser-cleaning tools are essentially a laser, a beam-delivery device, and a debris- collection accessory. Advanced developmental work has turned in large measure to ancillary subsystems for more sophisticated process control. Of particular importance are acoustic, optical, spectral, EMP, and electronic-vision process control. Beam direction may be via manual, translational-scanner, or robotic beam positioning implemented by means of fiber optics, minors, or prisms and computer control. Substrate thermal alteration and debris redeposition may be minimized or avoided through the incorporation of a gas jet, fluid or fluid jet, or dry-ice blast.

  20. Entrevista con Julian Pitt-Rivers.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1995-01-01

    Full Text Available El gran antropólogo inglés, nació en Londres, en 1919. Tras tomar parte en la guerra mundial, concluyó en Oxford su formación antropológica con EvansPritchard, doctorándose en 1953. Pitt-Rivers hizo su primer trabajo de campo de Andalucía, desde enero de 1949 hasta octubre de 1952, redactando después su estudio fundamental sobre Grazalema; al que siguió otro trabajo en el sudoeste francés. Más tarde, con el apoyo de la Universidad de Chicago, donde enseñó durante más de una década, analizó las transformaciones sociales en América hispanohablante. Desde 1964, simultanea su docencia americana con la de la École Pratique des Hautes Études en París y, después, acepta la cátedra que ocuparon Malinowski y Firth en Londres (1971-1977 -donde dio una célebre conferencia inaugural: Mana-. Volvió luego a enseñar en Francia: Aix-en-Provence (1979-1980 y París (Nanterre y École Pratique en la Sorbona, sección V «Ciencias religiosas», 1980-1986. Pero entre, 1965 y 1970, siguió escribiendo sobre el carnaval, la fiesta popular, el honor, el compadrazgo o la fiesta taurina españoles; así como sobre la circuncisión, la amistad y sus paradojas, la gracia, el dolor, el sacrificio y los rituales de la muerte. Desde su jubilación en 1986, ha proseguido estas investigaciones.

  1. Rescate articular con colgajo anterolateral del muslo

    Directory of Open Access Journals (Sweden)

    F.J. García-Bernal

    2015-06-01

    Full Text Available La preservación del nivel de amputación tanto de la extremidad superior como de la inferior, puede mejorar la función residual y el proceso de rehabilitación protésica de la misma. Ambas van a estar condicionadas por la longitud restante de la extremidad, la presencia o no de articulaciones operativas y la calidad de la cobertura del muñón. Presentamos 2 casos de amputaciones. El primero es un caso agudo de amputación traumática de extremidad superior a la altura del tercio proximal de antebrazo, que asocia avulsión cutánea circular desde el tercio medio del brazo y con articulación de codo conservada. El segundo, es la secuela de una amputación infracondílea de extremidad inferior por osteosarcoma que presenta fístulas cutáneas con drenaje supurativo por osteomielitis en el muñón tibial. En ambos pacientes realizamos cobertura con colgajo anterolateral de muslo anastomosado a la arteria radial en el caso de la extremidad superior, y a la arteria genicular descendente en la extremidad inferior. En los dos casos el postoperatorio transcurrió sin complicaciones, logrando preservar las articulaciones del codo y de la rodilla respectivamente, así como la posterior rehabilitación protésica. Consideramos que el colgajo anterolateral del muslo permite aportar tejido de buena calidad como cobertura del muñón de amputación. Dadas las características del tejido aportado y su volumen, es idóneo tanto para cobertura de defectos agudos como de déficits de almohadillado en casos crónicos.

  2. 9 CFR 319.300 - Chili con carne.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Chili con carne. 319.300 Section 319.300 Animals and Animal Products FOOD SAFETY AND INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE AGENCY... Products § 319.300 Chili con carne. “Chili con carne” shall contain not less than 40 percent of...

  3. 9 CFR 319.301 - Chili con carne with beans.

    Science.gov (United States)

    2010-01-01

    ... 9 Animals and Animal Products 2 2010-01-01 2010-01-01 false Chili con carne with beans. 319.301 Section 319.301 Animals and Animal Products FOOD SAFETY AND INSPECTION SERVICE, DEPARTMENT OF AGRICULTURE... Dehydrated Meat Food Products § 319.301 Chili con carne with beans. Chili con carne with beans shall...

  4. Jugando con la Estadística (y la Probabilidad)

    OpenAIRE

    Cabrera Gómez, Gloria

    2014-01-01

    Nos encontramos con un conjunto de ejercicios recopilados para las conferencias impartidas con el mismo título, durante la Semana de la Ciencia 2013, con el objeto de divulgar, motivar y atraer hacia la Estadística y la Probabilidad.

  5. [Unamuno con su nieto Miguel de Unamuno en brazos

    OpenAIRE

    Anónimo

    2010-01-01

    1 fot.; papel. - Retrato. Unamuno de pie con su nieto Miguel de Unamuno Pérez en brazos. (Gelatina D.O.P. brillo.Tarjeta postal con proceso fotográfico. Imagen contrastada con poco detalle en altas luces). - Procedencia: fondo Miguel de Unamuno. - Buena Conservación.

  6. Realidad del ocio de las personas con discapacidad intelectual

    OpenAIRE

    Guirao, I.

    2010-01-01

    “A toda vela” nace en Almería en 1997 con la misión de mejorar la calidad de vida de las personas con discapacidad intelectual y sus familias, a través del desarrollo preferente del ocio, mediante una alta participación de las personas con discapacidad intelectual, sus familias y la comunidad.

  7. Erosion processes and micro-particle production in gas discharge lasers

    Energy Technology Data Exchange (ETDEWEB)

    Letardi, T.; Giordano, G. [ENEA, Centro Ricerche Frascati, Frascati, RM (Italy). Dipt. Innovazione

    1999-07-01

    The erosion processes of the cathode for pulsed excimer gas lasers are explained by comparing the initiation conditions of the pulsed excimer gas laser discharge to that of the vacuum discharge breakdown. The number of the micro-particles, generated due to the above cathode-processes, are estimated. Several possible influences of the micro-particles on performances of the gas discharge lasers are analyzed. Two methods for eliminating the micro-particles or reducing their influences are discussed. [Italian] Viene descritto, comparandolo con la scarica in vuoto, il processo di erosione del catodo di un laser ad eccimeri a scarica. Viene stimato il numero delle micro-particelle generate dal processo di scarica. Vengono analizzate le possibili influenze di tali micro-particelle sulle prestazioni dei laser a scarica. Sono presentati e discussi due possibili metodi per la eliminazione delle micro-particelle generate dalla scarica.

  8. Diarrea en el paciente con diabetes mellitus

    OpenAIRE

    Jainer Méndez-Flórez; Laura García-Muñoz

    2015-01-01

    La diabetes mellitus es una enfermedad de gran prevalencia a nivel mundial que conlleva a muchas complicaciones, de las cuales las gastrointestinales son las mayormente olvidadas por el personal médico. Hasta el 22% de los pacientes con diabetes mellitus pueden tener diarrea y la causa de ello es multifactorial, pues incluye la neuropatía, efectos adversos de la terapia antidiabética, el aumento de la miocrobiota intestinal, entre otras. El tratamiento más efectivo es el control estricto de l...

  9. Actinomicosis periapical con resistencia a las penicilinas

    OpenAIRE

    Jotko, C. A.; Iantosca, A. E.; Pólvora, B.; Gagliardi, R. V.; Serrano, V. C.; M. Cattaneo; Solari, E.; Pertino, M. R.; Mele, S.; Giménez, G. L.; Degaetano, S.; Ameri, C.; M. Spina

    2015-01-01

    La actinomicosis es una enfermedad comúnmente causada por el Actinomyces israelii, bacteria anaeróbica grampositiva habitante normal de la cavidad bucal. La infección aparece generalmente después de un trauma, cirugía o una infección previa aunque extracciones dentarias, cirugía periodontales e infecciones orales predisponen al desarrollo de esta enfermedad. El tratamiento habitual es la eliminación de la causa acompañado de antibioticoterapia con penicilinas.

  10. Matemáticas escolares con geogebra

    OpenAIRE

    Aya, Orlando; Echeverry, Armando

    2008-01-01

    El documento que se presenta a continuación, tiene como propósito fundamental realizar una propuesta frente a la enseñanza de las cónicas a un nivel introductorio, en los cursos de educación media e incluso en los programas de licenciatura de la Facultad de Ciencia y Tecnología de la Universidad Pedagógica Nacional, particularmente para ofrecer una alternativa al paso de las representaciones sintéticas y analíticas de las cónicas. La propuesta esta apoyada en una serie de actividades con el u...

  11. Eficiencia temporal con modelos dea no radiales

    Directory of Open Access Journals (Sweden)

    A. Martínez

    2005-01-01

    Full Text Available Se presenta una aplicación del método Window Anlysis para analizar la eficiencia de diferentes unidades cuando se dispone de datos de panel. Además para este tipo de estudio se utiliza el modelo SBM (Slack based measure que analiza las desviaciones individuales de cada unos de los inputs u outputs utilizados en el estudio, la comunicación concluye con la aplicación practica de este procedimiento para los equipos de fútbol de la liga española.

  12. Cementos con FCC: cumplimiento de requerimientos normativos

    OpenAIRE

    Sánchez de Rojas, M. I.; García de Loma, M; Asensio, E.; Frías, Moisés; Medina, César

    2016-01-01

    El presente trabajo estudia la viabilidad de reciclar dos catalizadores gastados de craqueo catalítico, uno, procedente de los precipitadores electrostáticos y el otro, el catalizador sustituido, como adiciones activas al cemento. Para ello, se llevó a cabo una caracterización química, mineralógica y morfológica de los catalizadores por medio de FRX, DRX, y SEM, para finalmente realizar un estudio de los cementos donde se incorporaron diferentes porcentajes de los mismos con el fin de comprob...

  13. Rabdomiolisis asociada al tratamiento con valaciclovir

    OpenAIRE

    Héctor Enríquez Gómez; Javier De La Fuente Aguado; Laura González Vázquez; María Soledad Rodríguez Pecci

    2012-01-01

    La rabdomiolisis es un efecto secundario asociado a un buen número de fármacos, entre ellos los antivirales. Describimos un caso de rabdomiolisis secundaria a valaciclovir, efecto no descrito anteriormente en laliteratura, en un contexto clínico muy especial. Se trata de un varón queingresa por un golpe de calor secundario a la realización de ejercicio físicoextremo. Durante su ingreso se comienza tratamiento con valaciclovir porun herpes nasolabial, observándose en los días siguientes una ma...

  14. Programa de habilidades Sociales con Personas Mayores

    OpenAIRE

    2013-01-01

    Este proyecto refleja la necesidad del entrenamiento en habilidades sociales teniendo como destinatarios a un colectivo de personas mayores, con el que se realizará una propuesta práctica del proceso psicopedagógico tras una fase previa de evaluación y diagnóstico de las necesidades del colectivo; durante la fase del programa de intervención propiamente dicho, se llevarán a cabo sesiones que ayudarán a mejorar la autoestima, el control de la ira, la comunicación para establecer unas óptimas r...

  15. Bacteriemia en pacientes internados con celulitis

    OpenAIRE

    2012-01-01

    La celulitis es una inflamación aguda de la dermis y tejido celular subcutáneo de causa bacteriana, que generalmente complica a heridas, úlceras y dermatosis, aunque de manera frecuente no existe sitio de entrada. Se recomienda la realización de cultivo de punción de piel y partes blandas (PPB). Los hemocultivos raramente dan resultados positivos. El objetivo de este trabajo fue determinar la prevalencia de bacteriemia en pacientes internados en nuestra institución con diagnóstico de celuliti...

  16. Aceros al molibdeno sinterizados con gradiente funcional

    OpenAIRE

    2014-01-01

    Las propiedades que se solicitan a las piezas y productos exigen, la mayoría de las veces, una combinación de materiales que respondan a requerimientos específicos en función de su posición. La fabricación de materiales compuestos y materiales con gradiente funcional proporciona grandes posibilidades de respuesta a las necesidades demandas, tanto de satisfacción de requerimientos como de reducción de materias primas necesarias. En este sentido, satisfacer las propiedades demandadas, de manera...

  17. Tumor germinal mixto con componentes de disgerminoma y coriocarcinoma de ovario en mujer adolescente con ataxiatelangiectasia

    Directory of Open Access Journals (Sweden)

    Eduardo Augusto Gálvez-Cuitiva

    2015-11-01

    días. Se suspendió la quimioterapia porque desarrolló choque séptico que puso en riesgo su vida. Por su enfermedad de base permaneció bajo vigilancia. Actualmente, 17 meses después, la paciente vive sin actividad tumoral.  Conclusión: existe asociación entre ataxia-telangiectasia, leucemia y linfomas. Se describe el caso clínico de una paciente con ataxia-telangiectasia y tumor germinal mixto con componente de disgerminoma y coriocarcinoma de ovario. Se propone establecer un tratamiento especial para estos pacientes inmunocomprometidos, con alto riesgo de cáncer pero, a la vez, de no tolerar los esquemas habituales.

  18. The heat-pipe resembling action of boiling bubbles in endovenous laser ablation

    NARCIS (Netherlands)

    van der Geld, C.W.M.; van den Bos, R.R.; van Ruijven, P.W.M.; Nijsten, T.; Neumann, H.A.M.; van Gemert, M.J.C.

    2010-01-01

    Endovenous laser ablation (EVLA) produces boiling bubbles emerging from pores within the hot fiber tip and traveling over a distal length of about 20 mm before condensing. This evaporation-condensation mechanism makes the vein act like a heat pipe, where very efficient heat transport maintains a con

  19. Efectos de la terapia asistida con animales en dominios cognitivos en pacientes con esquizofrenia

    OpenAIRE

    Vitutia San Millán, María de la O

    2016-01-01

    Esta investigación tiene como objetivo determinar la efectividad de incorporar un programa de terapia asistida con animales (TAA) al tratamiento farmacológico y programa individualizado de rehabilitación psicosociolaboral en pacientes con esquizofrenia que acuden a recursos de atención social de la red de atención pública de la Comunidad de Madrid. Hay dos momentos, un primer estudio en el que la investigación se centra en evaluar la mejora de dominios clínicos, psicosociales y cognitivos y u...

  20. Problemas y necesidades relacionados con la salud en personas con discapacidad intelectual

    OpenAIRE

    Mirón, J.A.; et al.

    2005-01-01

    El objetivo del estudio es valorar los problemas y necesidades de Salud en personas adultas con discapacidad intelectual (PADI). Se evidencia la asociación de comorbilidad asociada a discapacidad intelectual con una alta prevalencia de enfermedades cardiovasculares, neurológicas y osteomusculares. El factor de riesgo más importante es el sobrepeso y la obesidad. La demanda de consulta médica es alta y la consulta al dentista es baja; ambas se asocian significativamente al bajo nivel socioecon...

  1. Máquinas metodológicas: encuentro con el otro, encuentros con el arte

    OpenAIRE

    Cervantes Botero, Elsa Patricia

    2015-01-01

    El proyecto Maquinas metodológicas: encuentro con el otro, encuentros con el arte, reconoce tres temporalidades que se encuentran presentes en las escuelas de arte: los sujetos, las instituciones y las formas de hacer. El estudio de estas temporalidades permite: evidenciar la distancia que se presenta entre ellas; reconocer la singularidad de los sujetos en contraposición a un intento de estandarización social que está presente en todas las instituciones; crear una metodología que examina, de...

  2. Laser scar revision.

    Science.gov (United States)

    Lupton, Jason R; Alster, Tina S

    2002-01-01

    A variety of lasers can be used to treat scars and striae effectively. It is of paramount importance that the type of scar be properly classified on initial examination so that the most appropriate method of treatment can be chosen. Classification also allows the laser surgeon to discuss with the patient the anticipated response to treatment. The 585-nm pulsed dye laser (PDL) is the most appropriate system for treating hypertrophic scars, keloids, erythematous scars, and striae. The PDL carries a low risk of side effects and complications when operated at appropriate treatment parameters and time intervals. Atrophic scars are best treated with ablative CO2 and Er:YAG lasers; however, proliferative keloids and hypertrophic scars should not be vaporized because of the high risk of scar recurrence or progression. The appropriate choice and use of lasers can significantly improve most scars. As research in laser-skin interaction continues, further refinements in laser technology coupled with the addition of alternate treatment procedures will allow improved clinical efficacy and predictability.

  3. Novel laser ion sources

    CERN Document Server

    Fournier, P; Kugler, H; Lisi, N; Scrivens, R; Rodríguez, F V; Düsterer, S; Sauerbrey, R; Schillinger, H; Theobald, W; Veisz, L; Tisch, J W G; Smith, R A

    2000-01-01

    Development in the field of high-power laser systems with repetition rates of several Hz and energies of few joules is highly active and opening, giving new possibilities for the design of laser ions sources. Preliminary investigations on the use of four different laser and target configurations are presented: (1) A small CO/sub 2/ laser (100 mJ, 10.6 mu m) focused onto a polyethylene target to produce C ions at 1 Hz repetition rate (CERN). (2) An excimer XeCl laser (6 J, 308 nm) focused onto solid targets (Frascati). (3) A femtosecond Ti: sapphire laser (250 mJ, 800 nm) directed onto a solid targets (Jena). (4) A picosecond Nd: yttrium-aluminum-garnet (0.3 J, 532 nm) focused into a dense medium of atomic clusters and onto solid targets (London). The preliminary experimental results and the most promising schemes will be discussed with respect to the scaling of the production of high numbers of highly charged ions. Different lasers are compared in terms of current density at 1 m distance for each charge state...

  4. Laser applications in surgery

    Science.gov (United States)

    Azadgoli, Beina

    2016-01-01

    In modern medicine, lasers are increasingly utilized for treatment of a variety of pathologies as interest in less invasive treatment modalities intensifies. The physics behind lasers allows the same basic principles to be applied to a multitude of tissue types using slight modifications of the system. Multiple laser systems have been studied within each field of medicine. The term “laser” was combined with “surgery,” “ablation,” “lithotripsy,” “cancer treatment,” “tumor ablation,” “dermatology,” “skin rejuvenation,” “lipolysis,” “cardiology,” “atrial fibrillation (AF),” and “epilepsy” during separate searches in the PubMed database. Original articles that studied the application of laser energy for these conditions were reviewed and included. A review of laser therapy is presented. Laser energy can be safely and effectively used for lithotripsy, for the treatment of various types of cancer, for a multitude of cosmetic and reconstructive procedures, and for the ablation of abnormal conductive pathways. For each of these conditions, management with lasers is comparable to, and potentially superior to, management with more traditional methods.

  5. [Low reactive laser therapy].

    Science.gov (United States)

    Saeki, Shigeru

    2012-07-01

    The type, characteristics and effect of low reactive laser equipment used for pain treatment in Japan are described in this section. Currently, low reactive laser therapy equipments marketed and used in Japan include diode laser therapeutic device with semiconductor as a medium consisting of aluminum, gallium and arsenic. Low reactive laser equipment comes in three models, the first type has a capacity of generating 1,000 mW output, and the second type has a capacity of generating 10 W output. The third type has four channels of output, 60, 100, 140 and 180 mW and we can select one channel out of the four channels. This model is also used as a portable device because of its light weight, and we can carry it to wards and to the outside of the hospital. Semiconductor laser has the capacity of deepest penetration and the effect tends to increase proportionally to the increasing output. Low reactive laser therapy is less invasive and lower incidence of complications. Although low reactive laser therapy might be effective for various pain disorders, the effect is different depending on the type of pain. We should keep in mind that this therapy will not give good pain relief equally in all patients with pain.

  6. Ultra-fast laser system

    Science.gov (United States)

    Dantus, Marcos; Lozovoy, Vadim V

    2014-01-21

    A laser system is provided which selectively excites Raman active vibrations in molecules. In another aspect of the present invention, the system includes a laser, pulse shaper and detection device. A further aspect of the present invention employs a femtosecond laser and binary pulse shaping (BPS). Still another aspect of the present invention uses a laser beam pulse, a pulse shaper and remote sensing.

  7. 1982 laser program annual report

    Energy Technology Data Exchange (ETDEWEB)

    Hendricks, C.D.; Grow, G.R. (eds.)

    1983-08-01

    This annual report covers the following eight sections: (1) laser program review, (2) laser systems and operation, (3) target design, (4) target fabrication, (5) fusion experiments program, (6) Zeus laser project, (7) laser research and development, and (8) energy applications. (MOW)

  8. en tratamiento con antipsicóticos

    Directory of Open Access Journals (Sweden)

    A. González Padrón

    2007-01-01

    Full Text Available La intensidad y la evolución de la esquizofrenia dependen de la alteración de determinados centros neuronales y de la interacción entre la gravedad de tales alteraciones y las fluctuaciones de diversos neurotransmisores y neuromoduladores, entre ellos, la dopamina. Quizás debido a esta complejidad y heterogeneidad tanto en su causa como en su evolución, se dan casos de pacientes tratados con antipsicóticos, fisiológicamente estabilizados y de los que no se espera una evolución desfavorable que sufren un fallecimiento inesperado. En este sentido, se considera un caso de muerte súbita en un paciente que padecía hipertensión arterial, diabetes mellitus y esquizofrenia hebefrénica en tratamiento con tioridazina, sustancia que es determinada mediante cromatografía gaseosa acoplada a espectrometría de masas (GC-MS detectándose la presencia de tioridazina en una concentración de 2,392 mg/L de sangre. Estudiando dicho caso y teniendo en cuenta otros similares se aportan consideraciones que pueden ser de utilidad en la evaluación de estos agentes terapéuticos.

  9. Polimiositis con incapacidad ventilatoria e insuficiencia respiratoria

    Directory of Open Access Journals (Sweden)

    O. Lopez Gaston

    2003-10-01

    Full Text Available Las miopatías inflamatorias son un grupo de enfermedades caracterizadas por debilidad muscular proximal y las causas mayores incluyen la polimiositis (PM, dermatomiositis y miositis por cuerpos de inclusión. Las complicaciones respiratorias son comunes y adquieren importancia por la incidencia sobre el pronóstico. Las tres formas de compromiso frecuentes son la enfermedad pulmonar intersticial, la neumopatía aspirativa y la incapacidad ventilatoria (IV por debilidad de los músculos respiratorios, que en su forma severa es de ocurrencia excepcional. Se presenta una paciente con IV sin compromiso del parénquima pulmonar, que requirió asistencia respiratoria mecánica por 4 meses con «destete» exitoso.The inflammatory diseases of muscle are a group of disorders characterized by proximal muscle weakness. Most cases fall into three major diagnostic categories, polymyositis (PM, dermatomyositis and inclusion body myositis. Respiratory complications are a common feature and are an important cause of morbidity and mortality. The three main types of pulmonary involvement are interstitial lung disease, aspiration pneumonia and ventilatory incapacity (VI due to muscle weakness. There are few reported cases in which mechanical ventilation has been used in patients with PM and VI in absense of lung disease. We present a patient with PM and VI due to muscle weakness who underwent therapy maintenance with mechanical ventilator and was weaned 4 months later.

  10. Entrevista con Jacques-Alain Miller.

    Directory of Open Access Journals (Sweden)

    Francisco Estévez González

    1987-01-01

    Full Text Available Jacques-Alain MILLER es psicoanalista, editor -uno de cuyos principales cometidos consiste en establecer los textos y la publicación de los Seminarios de Jacques LACAN, tal como le encargó el propio maestro escritor, prestigioso conferenciante y profesor especializado en los fundamentos del psicoanálisis. En la actualidad dirige el Departamento de Psicoanálisis de la Universidad de París VIII. Es miembro del Consejo de la Escuela de la Causa Freudiana, editor de las publicaciones del Campo Freudiano y director de la revista Ornicar, una de las más importantes publicaciones psicoanalíticas en el panorama internacional. Está casado con Judith MILLER -hija de LACAN-, presidenta de la Fundación del Campo Freudiano, con la que tiene dos hijos. Ha visitado España en numerosas ocasiones, pronunciando conferencias, dictando seminarios e impulsando la articulación de grupos de estudio psicoanalíticos en diversas ciudades. Es asesor editorial de la revista «El Analiticón», publicación del Campo Freudiano en España.

  11. Refortalecimiento: Un Debate con el Empowerment

    Directory of Open Access Journals (Sweden)

    Carlos Vázquez Rivera

    2004-01-01

    Full Text Available Mi intención, en este artículo, es problematizar lo que llamo el proceso de compra de conceptos y con él las dificultades implícitas en toda traducción. Explorar las limitaciones de la noción de empowerment en su conceptualización y práctica y finalmente proponer una estrategia alterna, que he dado en llamar refortalecimiento. Esta noción nace desde nuestro contexto cultural, histórico, psicológico, social y comunitario. Las circunstancias históricas que bordean la reflexión que propongo ante su consideración tienen como marco de referencia los debates al interior de la Psicología Social Comunitaria, la condición colonial en la que aún se encuentra nuestro país, las tensiones existentes respecto al consumo y producción del conocimiento y un contrapunteo con la noción de empowerment.

  12. Valuación con opciones reales de proyectos con flujos correlacionados con fundamentales económicos y con saltos extremos Viabilidad del caso COMERCI UCB

    Directory of Open Access Journals (Sweden)

    Sergio Mendoza Sandoval

    2014-01-01

    Full Text Available Este trabajo extiende el método de flujos de efectivo desconta - dos para valuar proyectos de inversión a través de la incorpo - ración de opciones reales. Se supone que los flujos de efectivo generados por la empresa están correlacionados con fundamen - tales macroeconómicos, particularmente con la tasa de interés; asimismo, se supone que presentan saltos cuyo tamaño está dado por una distribución de valores extremos. Estos flujos son vistos como un portafolio de opciones reales, que surgen de un proceso de optimización dinámica estocástica donde el inversionista (el empresario busca maximizar su utilidad total descontada, sujeto a la riqueza que posee. Esta riqueza incluye el proyecto de inversión, un bono libre de riesgo de incumpli - miento y un conjunto de opciones reales asociadas al proyecto.

  13. Obligaciones morales con seres no humanos

    Directory of Open Access Journals (Sweden)

    Rodrigo J. Ocampo

    2014-06-01

    Full Text Available Entre los modelos de reflexión ética a partir de los cuales es posible dar cuenta del debate sobre las relaciones entre seres humanos y no humanos están: el deontológico, el contractualista, el utilitarista, el neoaristotélico y el discursivo. En este artículo se examinará, a partir de ellos, la cuestión del estatus moral asignado a los animales y a la naturaleza, junto con la posibilidad de cada uno para sustentar la ampliación de las obligaciones morales. Para tal fin, se estudian los principales argumentos para reconocer o negar consideración moral a seres no humanos, así como los alcances de estas justificaciones para comprender el sentido y límites de la comunidad ética. Esto permitirá clasificar los enfoques éticos mencionados atendiendo a sus afinidades con diversas formas de antropocentrismo o biocentrismo.

  14. con enfermedad crónica

    Directory of Open Access Journals (Sweden)

    María del Refugio Zavala Rodríguez

    2007-01-01

    Full Text Available El propósito del estudio fue determinar el grado de correlación entre los niveles de fortaleza para la salud y de ansiedad-rasgo, en unamuestra de 200 pacientes integrada por medio de muestreo no probabilístico; los criterios de inclusión fueron: adultos de ambos génerosdiagnosticados con enfermedad crónica, con estudios de enseñanza básica y orientada. El marco teórico que guió la investigación es elModelo de Adaptación de Roy. El diseño fue descriptivo, transversal, correlacional. Se utilizó el cuestionario de fortaleza de S. Pollock y laescala de autoevaluación de ansiedad-rasgo de Spielberger; los instrumentos presentaron una consistencia interna aceptable con unAlpha de Cronbach de ,852 y ,813 respectivamente. La información se recabó de cuatro instituciones de salud ubicadas en los municipiosde Tampico-Cd. Madero Tamaulipas, México. El análisis de los datos se efectuó mediante estadística descriptiva e inferencial, se utilizó elpaquete estadístico SPSS versión 13. El rango de edad que predominó fue de 45 a 64 años (54%; el 55% fue del sexo femenino, el 48%cuenta con estudios de primaria, cerca del 90% padece de una enfermedad metabólica. El coeficiente de correlación de Spearman entrela fortaleza para la salud y la ansiedad-rasgo fue significativo (Œ,570, valor Œp,000. En la mayoría de la población participante se encontróun nivel moderado tanto de fortaleza (83% como de ansiedad (73%. El análisis de regresión múltiple indicó que la relación significativaentre estas dos variables no es afectada por la edad, el género o los años de evolución de la enfermedad crónica. Los datos de este estudiomuestran evidencia de que en los pacientes con enfermedades crónicas a mayor nivel de fortaleza menor nivel de ansiedad-rasgo. Estasituación invita a desarrollar más estudios de estos fenómenos, en la disciplina de enfermería, que sirvan como sustento teórico-prácticopara el diseño o la mejora de

  15. Dye laser principles with applications

    CERN Document Server

    Duarte, Frank J; Liao, Peter F; Kelley, Paul

    1990-01-01

    A tutorial introduction to the field of dye lasers, Dye Laser Principles also serves as an up-to-date overview for those using dye lasers as research and industrial tools. A number of the issues discussed in this book are pertinent not only to dye lasers but also to lasers in general. Most of the chapters in the book contain problem sets that expand on the material covered in the chapter.Key Features* Dye lasers are among the most versatile and successful laser sources currently available in use Offering both pulsed and continuous-wave operation and tunable from the near ultraviole

  16. Optimising Laser Tattoo Removal

    Science.gov (United States)

    Sardana, Kabir; Ranjan, Rashmi; Ghunawat, Sneha

    2015-01-01

    Lasers are the standard modality for tattoo removal. Though there are various factors that determine the results, we have divided them into three logical headings, laser dependant factors such as type of laser and beam modifications, tattoo dependent factors like size and depth, colour of pigment and lastly host dependent factors, which includes primarily the presence of a robust immune response. Modifications in the existing techniques may help in better clinical outcome with minimal risk of complications. This article provides an insight into some of these techniques along with a detailed account of the factors involved in tattoo removal. PMID:25949018

  17. LASER safety course

    CERN Multimedia

    HR Department

    2008-01-01

    Two sessions of the LASER safety course will be held in October IN ENGLISH. PLEASE SIGN-UP! -\t"Laser Users", on 27 October, 08:30-12:30. -\t"Laser Experts", on 27-28 October, 08:30-17:30 (including practical session) specifically aimed at LSOs. To register, go to: https://edh.cern.ch/Document/TRN/new?course=077X10 You will receive an invitation via e-mail once your EDH document has been completed and fully signed. For further information, please contact Safety Training (73811).

  18. Plasmonic colour laser printing

    DEFF Research Database (Denmark)

    Zhu, Xiaolong; Vannahme, Christoph; Højlund-Nielsen, Emil

    2016-01-01

    -beam lithography (EBL) or focused ion beam (FIB), both expensive and not scalable processes that are not suitable for post-processing customization. Here we show a method of colour printing on nanoimprinted plasmonic metasurfaces using laser post-writing. Laser pulses induce transient local heat generation...... that leads to melting and reshaping of the imprinted nanostructures. Depending on the laser pulse energy density, different surface morphologies that support different plasmonic resonances leading to different colour appearances can be created. Using this technique we can print all primary colours...

  19. Thallium Mercury Laser Development.

    Science.gov (United States)

    1980-04-17

    AD-A9 840 WESTINGHOUSE RESEARCH AND DEVELOPMENT CENTER PITTSBU--ETC F/A 20/5 THALLIUM MERCURY LASER DEVELOPMENT .(U) APR 80 C S LIU, D W FELDMAN, J L...PACK NO001I78-C-0131 lIlrt A nEQE-WOTFX-R NL THALLIUM MERCURY LASER DEVELOPMENT C. S. Liu, D. W. Feldman and J. L. Pack FINAL REPORT (PHASE II...PERIOD COVERED Thallium Mercury Laser Development -T- Final Report (Phase II) Feb. 1, 1979 to Jan. 31, 1980 77a. w-atF. -REPORT NUMBER _,___C2-OTEX

  20. Ultrashort Laser Pulse Phenomena

    CERN Document Server

    Diels, Jean-Claude

    2006-01-01

    Ultrashort Laser Pulse Phenomena, 2e serves as an introduction to the phenomena of ultra short laser pulses and describes how this technology can be used to examine problems in areas such as electromagnetism, optics, and quantum mechanics. Ultrashort Laser Pulse Phenomena combines theoretical backgrounds and experimental techniques and will serve as a manual on designing and constructing femtosecond (""faster than electronics"") systems or experiments from scratch. Beyond the simple optical system, the various sources of ultrashort pulses are presented, again with emphasis on the basic

  1. Optimising laser tattoo removal

    Directory of Open Access Journals (Sweden)

    Kabir Sardana

    2015-01-01

    Full Text Available Lasers are the standard modality for tattoo removal. Though there are various factors that determine the results, we have divided them into three logical headings, laser dependant factors such as type of laser and beam modifications, tattoo dependent factors like size and depth, colour of pigment and lastly host dependent factors, which includes primarily the presence of a robust immune response. Modifications in the existing techniques may help in better clinical outcome with minimal risk of complications. This article provides an insight into some of these techniques along with a detailed account of the factors involved in tattoo removal.

  2. Laser in manufacturing

    CERN Document Server

    Davim, J Paulo

    2013-01-01

    Generally a laser (light amplification by stimulated emission of radiation) is defined as "a device which uses a quantum mechanical effect, stimulated emission, to generate a coherent beam of light from a lasing medium of controlled purity, size, and shape". Laser material processing represents a great number of methods, which are rapidly growing in current and different industrial applications as new alternatives to traditional manufacturing processes. Nowadays, the use of lasers in manufacturing is an emerging area with a wide variety of applications, for example, in electronics, molds an

  3. Laser Range Sensors

    Directory of Open Access Journals (Sweden)

    K.C. Bahuguna

    2007-11-01

    Full Text Available This paper presents the design aspects of laser range finders and proximity sensors being developed at IRDE for different applications. The principle used in most of the laser range finders is pulse echo or time-of-flight measurement. Optical triangulation is used in proximity sensors while techniques like phase detection and interferometry are employed in instruments for surveying and motion controllers where high accuracy is desired. Most of the laser range finders are designed for ranging non-cooperative targets.

  4. Random Fiber Laser

    CERN Document Server

    de Matos, Christiano J S; Brito-Silva, Antônio M; Gámez, M A Martinez; Gomes, Anderson S L; de Araújo, Cid B

    2007-01-01

    We investigate the effects of two dimensional confinement on the lasing properties of a classical random laser system operating in the incoherent feedback (diffusive) regime. A suspension of 250nm rutile (TiO2) particles in a Rhodamine 6G solution was inserted into the hollow core of a photonic crystal fiber (PCF) generating the first random fiber laser and a novel quasi-one-dimensional RL geometry. Comparison with similar systems in bulk format shows that the random fiber laser presents an efficiency that is at least two orders of magnitude higher.

  5. Color speckle in laser displays

    Science.gov (United States)

    Kuroda, Kazuo

    2015-07-01

    At the beginning of this century, lighting technology has been shifted from discharge lamps, fluorescent lamps and electric bulbs to solid-state lighting. Current solid-state lighting is based on the light emitting diodes (LED) technology, but the laser lighting technology is developing rapidly, such as, laser cinema projectors, laser TVs, laser head-up displays, laser head mounted displays, and laser headlamps for motor vehicles. One of the main issues of laser displays is the reduction of speckle noise1). For the monochromatic laser light, speckle is random interference pattern on the image plane (retina for human observer). For laser displays, RGB (red-green-blue) lasers form speckle patterns independently, which results in random distribution of chromaticity, called color speckle2).

  6. Organic solid-state lasers

    CERN Document Server

    Forget, Sébastien

    2013-01-01

    Organic lasers are broadly tunable coherent sources, potentially compact, convenient and manufactured at low-costs. Appeared in the mid 60’s as solid-state alternatives for liquid dye lasers, they recently gained a new dimension after the demonstration of organic semiconductor lasers in the 90's. More recently, new perspectives appeared at the nanoscale, with organic polariton and surface plasmon lasers. After a brief reminder to laser physics, a first chapter exposes what makes organic solid-state organic lasers specific. The laser architectures used in organic lasers are then reviewed, with a state-of-the-art review of the performances of devices with regard to output power, threshold, lifetime, beam quality etc. A survey of the recent trends in the field is given, highlighting the latest developments with a special focus on the challenges remaining for achieving direct electrical pumping of organic semiconductor lasers. A last chapter covers the applications of organic solid-state lasers.

  7. Laser forming and welding processes

    CERN Document Server

    Yilbas, Bekir Sami; Shuja, Shahzada Zaman

    2013-01-01

    This book introduces model studies and experimental results associated with laser forming and welding such as laser induced bending, welding of sheet metals, and related practical applications. The book provides insight into the physical processes involved with laser forming and welding. The analytical study covers the formulation of laser induced bending while the model study demonstrates the simulation of bending and welding processes using the finite element method. Analytical and numerical solutions for laser forming and welding problems are provided.

  8. Diarrea recurrente por Cystoisopora belli en pacientes con infección por VIH con TARGA

    Directory of Open Access Journals (Sweden)

    Raúl Montalvo

    Full Text Available La Cystoisospora belli, antes denominada Isospora belli, es el agente etiológico de la cystoisosporiasis, una infección oportunista que afecta a pacientes inmunodeprimidos, caracterizada por diarrea crónica y pérdida ponderal. La incidencia de diarrea crónica por este agente, en pacientes infectados por el VIH, ha disminuido considerablemente. Ello gracias al advenimiento de la terapia antirretroviral de gran actividad (TARGA, con la que se ha logrado mejorar la respuesta inmunológica del paciente y disminuir su carga viral. Se presentan seis casos de cystoisosporiasis recurrente y refractaria en pacientes con infección por VIH, en quienes se diagnosticó cystoisosporiasis pese a que previamente se encontraban recibiendo profilaxis con trimetropin/sulfametoxazol (TMP/SMX. Cinco de ellos evolucionaron de manera tórpida y fallecieron, a pesar de una buena respuesta al TARGA (adecuado incremento de CD4 y disminución de la carga viral hasta rangos indetectables, y de tratamiento con TMP/SMX por vía oral y otros medicamentos de segunda línea.

  9. Disseminated paracoccidioidomycosis with peripleuritis in an AIDS patient Paracoccidioidomicosis diseminada con peripleuritis en paciente con SIDA

    Directory of Open Access Journals (Sweden)

    Marcelo Corti

    2004-02-01

    Full Text Available Paracoccidioidomycosis is one of the most frequent systemic and endemic mycoses of Latin America caused by a dimorphic fungus. In AIDS patients, paracoccidioidomycosis appears as a severe and disseminated disease with a wide spectrum of clinical findings. The CD4 counts are usually less than 200 cell/mu L. We present a case of disseminated paracoccidioidomycosis with peripleuritis and subcutaneous abscesses on the chest wall as initial manifestation of AIDS. In endemic countries, paracoccidioidomycosis should be included as an opportunistic infection in AIDS.La paracoccidioidomicosis es una de las micosis sistémicas endémicas más frecuentes de Latinoamérica, causada por un hongo dimorfo. En los pacientes con SIDA se presenta como una enfermedad grave y diseminada, con un amplio espectro de manifestaciones clínicas. Los niveles de linfocitos T CD4 + son habitualmente < de 200 cél/myL. Presentamos un caso de paracoccidioidomicosis diseminada con peripleuritis y abscesos subcutáneos sobre la pared torácica como manifestación inicial del SIDA. En países endémicos, la paracoccidioidomicosis debe incluirse como una complicación oportunista de los pacientes con SIDA.

  10. RUPTURA CON EL EJE Y ALINEAMIENTO CON ESTADOS UNIDOS: CHILE DURANTE LA SEGUNDA GUERRA MUNDIAL

    Directory of Open Access Journals (Sweden)

    Raffaele Nocera

    2005-12-01

    Full Text Available En este trabajo se avanza más allá en la investigación de un tema que ya ha sido objeto de otros estudios. Se entrega un análisis pormenorizado de la posición de Chile ante el origen y primer desarrollo de la Segunda Guerra Mundial. Aunque se destacan las relaciones con EE.UU., en base principalmente a un amplio estudio de archivos chilenos y norteamericanos, se analiza la situación tanto política como económica del país en relación a la guerra. El artículo vincula las relaciones de Chile con Estados Unidos a la luz de sus propias relaciones con el conflicto europeo, y particularmente con la Alemania naziThis study advances the research of a field, which already has been subyect of other works. There is a detailed analysis on Chile's position in front of the origins and in the first stage of the Second World War. There is an emphasis on relations with the U.S., based on Chilean and American archives, on the economic and political attitudes on the war. The article links the relations between Chile and the U.S. under the light of Chilean relations with the European conflict and, specially, Nazi Germany

  11. ESTUDIO DE LA DIGESTION HUMANA CON ALUMNOS CON DIFICULTADES DE APRENDIZAJE

    Directory of Open Access Journals (Sweden)

    Mª Begoña Carretero Gómez

    2009-01-01

    Full Text Available En esta experiencia se han seleccionado una serie de actividades relacionadas con la digestión con el fin de lograr una reestructuración de ideas y cambios conceptuales, y así con la conseguir que el alumnado aprenda a construir sus propios conocimientos acerca de cómo y donde se dan los procesos de digestión necesarios para la nutrición del organismo. El trabajo se ha llevado a cabo con alumnos de 3º de Educación Secundaria Obligatoria, pertenecientesal programa de diversificación curricular. Hemos querido hacer la ciencia más cercana para que comprendan que algunos procesos tienen su explicación científica y que la ciencia forma parte de nuestro día a día, fomentando el interés del estudiante así como su implicación en el proceso de enseñanza-aprendizaje. Por ello hemos trabajado a base de pequeñas investigaciones, donde es el alumno el que marca su ritmo de trabajo, investiga y hace sus aportaciones. Han aprendido a trabajar de una forma meticulosa donde el rigor esfundamental, contagiándose del afán investigador de manera que al realizar las experiencias se han aproximado al trabajo científico a la vez que aclaran y reestructuran conocimientos.

  12. Tratamiento con sociodrama familiar de un niño epiléptico con disconducta.

    Directory of Open Access Journals (Sweden)

    Pablo Álvarez Valcarce

    1985-01-01

    Full Text Available Existe una marcada relación entre las disconductas de las epilepsias del Lóbulo Temporal (agresiones, intentos de suicidio, etc. y los trastornos emocionales del entorno familiar. El tratamiento propuesto es el Psicodrama Moreniano, aplicado primeramente como Sociodrama Vincular a la relación madre-hijo, después como Grupo de Psicodrama de Adolescentes, y finalmente como Sociodrama Familiar. Un niño de trece días de edad, es ingresado en el hospital con deshidratación severa, parada cardio-respiratoria e intolerancia alimentaria total. Permanece ingresado durante siete meses. Desde entonces presenta alteraciones de conducta progresivamente más graves hasta que a los doce años experimenta varias crisis convulsivas atípicas. El EEG bajo sueño, muestra una punta muy persistente en el Lóbulo Temporal derecho. El tratamiento farmacológico mejoró las crisis que desaparecieron, pero los trastornos de conducta empeoraron con aparición de intentos de suicidio. Es en este momento cuando se comienza el tratamiento con Sociodrama. La dramatización de las fantasías agresivas con él y con su madre, conlleva la desaparición de las pseudo-alucinaciones auditivas. El uso de las técnicas de Concretización al dramatizar las fantasías de suicidio, produce una mejoría de las disconductas. La dramatización del rol sádico pone en evidencia el Mecanismo Reparatorio de tipo Histérico que subyace a las disconductas. A partir de todo esto, el paciente instaura la conducta de buscar a su padre (normalmente ausente después de sus ataques de furia. Al trabajar con toda la familia se ponen en evidencia las posiciones sociométricas, los deficientes roles de esposos, los mitos familiares, la relación madre-hijo altamente sexualizada, y el pobremente estructurado rol de padre. En el Grupo de Psicodrama de Adolescentes, el paciente trabaja con sus relaciones angulares y triangulares, lo que facilita el aprendizaje de los roles sociales. El paciente

  13. Comunicación con padres y conducta sexual en jóvenes mexica-nos con discapacidad auditiva

    OpenAIRE

    Robles Montijo, Silvia Susana; Universidad Nacional Autónoma de México; Guevara Benítez, Yolanda; Pérez Bautista, Yuma Yoaly; Hermosillo García, Ángela

    2013-01-01

    Se adaptaron cuatro instrumentos dirigidos a jóvenes con discapacidad auditiva con el fin de describir su perfil sociodemográfico, antecedentes de su discapacidad, patrón de comportamiento sexual, y nivel de comunicación con sus padres y madres sobre temas de salud sexual. En dicha adaptación participaron once jóvenes y un instructor con dominio del lenguaje de señas. En la fase de aplicación de instrumentos participaron 132 jóvenes con discapacidad auditiva, de entre 15 y 26 años de edad, se...

  14. Utilidad de la gammagrafía con Ga 67 en el seguimiento de pacientes con linfoma: Reporte preliminar

    OpenAIRE

    Saavedra, Patricia; Cano, Roque; Morales, Rosanna; Sánchez, Rolando; Muñoz, Luis; Gómez, Henry; Carracedo, Carlos; León, Luis; Vallejos, Carlos; Casanova, Luis; Guerrero,Jorge; Cisneros, Félix

    2005-01-01

    El objetivo del estudio fue determinar la utilidad de la gammagrafía con galio 67 en la valoración de respuesta al tratamiento en pacientes con Enfermedad de Hodgkin o con Linfoma No Hodgkin. Entre marzo del 2003 y junio del 2004, se evaluaron a 21 pacientes entre 15 y 72 años con Linfoma non Hodgkin (08 pacientes) y Enfermedad de Hodgkin (13 pacientes). De los 21 rastreos corporales con galio 67 realizados, 14 fueron considerados negativos y 07 positivos, teniéndose un caso falso negativo ...

  15. Estabilidad a la congelación descongelación de emulsiones o/w preparadas con aislados de soja nativos y desnaturalizados con diferente solubilidad

    Directory of Open Access Journals (Sweden)

    Gonzalo Palazolo

    2011-05-01

    Full Text Available En este trabajo se evaluó la estabilidad a la congelación de emulsiones modelo aceite en agua (o/w preparadas con cuatro aislados de soja: dos nativos (ASN-1 y ASN-2, de similar composición pero diferente solubilidad, >90% y ~75%, respectivamente y dos desnaturalizados (ASD-1 y ASD-2, resultantes de calentar los respectivos aislados nativos (90 ‹C, 5 minutos. Las emulsiones preparadas con dispersiones acuosas al 2% p/v de ASN o ASD y aceite de girasol refinado (ƒ³ =0,25, se congelaron a -20 ‹C por 24 horas y luego se descongelaron a 20 ‹C. La estabilidad se evaluo a partir de medidas de distribución de tamano de partícula (difraccion laser y aceite liberado (AL, metodo de dilucion del colorante. Las emulsiones preparadas con ASN-2 y ASD-2 resultaron muy inestables despues de ser congeladas y descongeladas, resultadoque se evidenció por el aumento del tamano de partícula y un AL>25%. Al usar el aislado ASN-1 de mayor solubilidad, las emulsiones fueron mas estables y se observó un marcado incremento de la estabilidad cuando sus proteínas eran desnaturalizadas (ASD-1, no observándose prácticamente coalescencia ni aceite separado. En conclusión, la solubilidad y la desnaturalización proteíca de los aislados de soja son factores decisivos en la estabilidad de emulsiones frente a la congelación-descongelación.

  16. Fiber Lasers V

    DEFF Research Database (Denmark)

    Hansen, Kim P.; Olausson, Christina Bjarnal Thulin; Broeng, Jes

    2008-01-01

    High-power fiber lasers and amplifiers have gained tremendous momentum in the last five years, and many of the traditional manufactures of gas and solid-state lasers are pursuing the attractive fiber-based systems, which are now displacing the old technology in many areas. High-power fiber laser...... systems require specially designed fibers with large cores and good power handling capabilities – requirements that are all met by the airclad fiber technology. In the present paper we go through many of the building blocks needed to build high-power systems and we show an example of a complete airclad...... laser system. We present the latest advancements within airclad fiber technology including a new 70 μm single-mode polarization-maintaining rod-type fiber capable of amplifying to MW power levels. Furthermore we describe the novel airclad based pump combiners and their use in a completely monolithic 350...

  17. Belfort Laser Ceilometer

    Data.gov (United States)

    Oak Ridge National Laboratory — The Belfort laser ceilometer (BLC) Model 7013C field unit is a self-contained, ground-based, optical, active remote sensing instrument with the ability to detect and...

  18. Beamlet laser diagnostics

    Energy Technology Data Exchange (ETDEWEB)

    Burkhart, S.C.; Behrendt, W.C.; Smith, I.

    1996-06-01

    Beamlet is instrumented extensively to monitor the performance of the overall laser system and many of its subsystems. Beam diagnostics, installed in key locations, are used to fully characterize the beam during its propagation through the multipass cavity and the laser`s output section. This article describes the diagnostics stations located on Beamlet and discusses the design, calibration, and performance of the Beamlet calorimeters. The authors used Nova`s diagnostics packages to develop the Beamlet design to determine beam energy, spatial profile, temporal profile, and other beam parameters. Technologic improvements within the last several years in controls, charge-coupled device (CCD) cameras, and fast oscilloscopes have allowed the authors to obtain more accurate measurements on the Beamlet laser system. They briefly cover some of these techniques, including a description of their LabVIEW based data acquisition system.

  19. Lasers in aesthetic dentistry.

    Science.gov (United States)

    Adams, Timothy C; Pang, Peter K

    2004-10-01

    This article focuses on lasers and aesthetic dentistry and their unique parallel in history from their early development to their present day usage and application. The demand for aesthetic dentistry has had a major impact not only on treatment planning but also on the choice of materials, techniques, and equipment. It is this demand that has married the use of lasers with aesthetic dentistry. A short literature review on the five basic laser types precedes the basic premise of smile design and its critical importance in attaining the desirable aesthetic end result. A short review on biologic width and biologic zone reinforces their importance when manipulating gingival tissue. Four case reports highlight the use of diode, erbium, and carbon dioxide lasers. The end results show the power of proper treatment planning and the use of a smile design guide when using these instruments and confirm a conservative, aesthetic treatment without compromising the health and function of the patients.

  20. Laser dye technology

    Energy Technology Data Exchange (ETDEWEB)

    Hammond, P R

    1999-09-01

    The author has worked with laser dyes for a number of years. A first interest was in the Navy blue-green program where a flashlamp pumped dye laser was used as an underwater communication and detection device. It made use of the optical window of sea-water--blue for deep ocean, green for coastal water. A major activity however has been with the Atomic Vapor Laser Isotope Separation Program (AVLIS) at the Lawrence Livermore National Laboratory. The aim here has been enriching isotopes for the nuclear fuel cycle. The tunability of the dye laser is utilized to selectively excite one isotope in uranium vapor, and this isotope is collected electrostatically as shown in Figure 1. The interests in the AVLIS program have been in the near ultra-violet, violet, red and deep-red.

  1. Jupiter Laser Facility

    Data.gov (United States)

    Federal Laboratory Consortium — The Jupiter Laser Facility is an institutional user facility in the Physical and Life Sciences Directorate at LLNL. The facility is designed to provide a high degree...

  2. Laser therapy for periodontitis

    Science.gov (United States)

    Efanov, O. I.

    2001-04-01

    An investigation was made of applying pulsed (lambda) equals 0.89 micrometers laser radiation in the treatment for early diagnosed periodontitis. The investigation was made on 65 patients (47 patients constituted the experimental group and 18 patients constituted a control group) affected by periodontitis. Clinical and functional tests revealed that laser therapy produced a string effect on the course of the illness. It reduced bleeding, inflammation, and pruritus. However, it did not produce an affect on electroexcitation. Biomicroscopic examinations and periodontium rheography revealed that the gingival blood flow became normal after the course of laser therapy. The capillary permeability and venous congestion decreased, which was confirmed by the increased time of vacuum tests, raised gingival temperature, reduced tissue clearance, and increased oxygen tension. Apart from that, laser therapy subsided fibrinolysis, proteolytic tissue activity, and decreased the exudative inflammation of periodontium.

  3. Lasers and holography

    CERN Document Server

    Kock, Winston E

    1981-01-01

    Accessible, illustrated introduction covers wave patterns and coherence, summarizes the development of lasers and the phenomenon of wave diffraction, and describes zone plates and properties of holograms. 1981 edition.

  4. Dynamical laser spike processing

    CERN Document Server

    Shastri, Bhavin J; Tait, Alexander N; Rodriguez, Alejandro W; Wu, Ben; Prucnal, Paul R

    2015-01-01

    Novel materials and devices in photonics have the potential to revolutionize optical information processing, beyond conventional binary-logic approaches. Laser systems offer a rich repertoire of useful dynamical behaviors, including the excitable dynamics also found in the time-resolved "spiking" of neurons. Spiking reconciles the expressiveness and efficiency of analog processing with the robustness and scalability of digital processing. We demonstrate that graphene-coupled laser systems offer a unified low-level spike optical processing paradigm that goes well beyond previously studied laser dynamics. We show that this platform can simultaneously exhibit logic-level restoration, cascadability and input-output isolation---fundamental challenges in optical information processing. We also implement low-level spike-processing tasks that are critical for higher level processing: temporal pattern detection and stable recurrent memory. We study these properties in the context of a fiber laser system, but the addit...

  5. Electra Laser Facility

    Data.gov (United States)

    Federal Laboratory Consortium — FUNCTION: The Electra Laser Facility is used to develop the science and technology needed to develop a reliable, efficient, high-energy, repetitively pulsed krypton...

  6. Blackbody metamaterial lasers

    KAUST Repository

    Liu, Changxu

    2015-01-01

    We investigate both theoretically and experimentally a new type of laser, which exploits a broadband light "condensation" process sustained by the stimulated amplification of an optical blackbody metamaterial. © 2014 Optical Society of America.

  7. A semiconductor laser

    Energy Technology Data Exchange (ETDEWEB)

    Naoko, O.; Masaru, K.

    1984-04-20

    A semiconductor laser with enhanced characteristics is patented in which bleaching coatings are generated on the outcoupling mirrors by sputtering alternating coating layers made from A1203 and A10, with high and low indices of refraction.

  8. Incidencia y factores asociados con las reacciones adversas del tratamiento antirretroviral inicial en pacientes con VIH

    Directory of Open Access Journals (Sweden)

    Juan Astuvilca

    2007-07-01

    Full Text Available La alta incidencia de reacciones adversas medicamentosas (RAMA al tratamiento antirretroviral de gran actividad (TARGA en pacientes con VIH/SIDA puede afectar la calidad de vida y adherencia al tratamiento. Objetivos: Determinar la incidencia de RAMA del TARGA inicial e identificar los factores asociados con la ocurrencia de RAMA al recibir dicha terapia. Materiales y métodos: Se realizó un estudio de cohorte histórica con todos los pacientes VIH (+ mayores de 18 años que recibieron TARGA por primera vez en el Hospital Nacional Arzobispo Loayza, con un seguimiento de 360 días desde la primera prescripción. Se recabó las RAMA de las historias clínicas y tarjetas de control. Resultados: Se incluyeron 353 pacientes, se encontró una incidencia acumulada de 66,7% de efectos adversos al TARGA inicial y una densidad de incidencia de 9,1 eventos de RAMA por 10 personas año de seguimiento (IC95%: 8,1-10,1. Anemia (23,4%, náuseas (20,6% y rash (17,2% fueron las RAMA más frecuentes. El uso de drogas (OR 2,40; IC95% 1,01-5,67; consumo de alcohol (OR 0.32; IC95%: 0,19-0,55 y estadio SIDA (OR 0,20; IC95%: 0,04-0,95 estuvieron asociadas con la presencia de RAMA. Conclusiones: Existe un alta incidencia de RAMA, siendo la anemia la más frecuente. El uso de drogas es un factor de riesgo para presentar RAMA.

  9. femtosecond laser ablation

    OpenAIRE

    Margetic, Vanja

    2003-01-01

    Femtosecond laser ablation was investigated as a solid sampling method for elemental chemical analysis. In comparison to the sampling with longer laser pulses, two aspects could be improved by using ultrashort pulses: elimination of the elemental fractionation from the ablation crater, which is necessary for an accurate quantitative analysis, and better control of the material removal (especially for metals), which increases the spatial resolution of microanalysis. Basic aspects of ultrashort...

  10. Laser Impact Welding

    OpenAIRE

    Daehn, Glenn S.; Lippold, John; Liu, Deijan; Taber, Geoff; Wang, Huimin

    2012-01-01

    Laser impact welding is a solid-state, collision-based welding process. In this process, laser-generated optical energy is converted to kinetic energy through the ablation at the surface and confinement of the gas generated between a flyer and backing plate. The launch of the flyer can be affected by many factors, for example, backing material, ablative layer, and flyer thickness. In this paper, the effect of three backing materials: glass, polycarbonate and cellophane tape, we...

  11. Hybrid vertical cavity laser

    DEFF Research Database (Denmark)

    Chung, Il-Sug; Mørk, Jesper

    2010-01-01

    A new hybrid vertical cavity laser structure for silicon photonics is suggested and numerically investigated. It incorporates a silicon subwavelength grating as a mirror and a lateral output coupler to a silicon ridge waveguide.......A new hybrid vertical cavity laser structure for silicon photonics is suggested and numerically investigated. It incorporates a silicon subwavelength grating as a mirror and a lateral output coupler to a silicon ridge waveguide....

  12. Laser Scanning in Forests

    OpenAIRE

    Håkan Olsson; Juha Hyyppä; Markus Holopainen

    2012-01-01

    The introduction of Airborne Laser Scanning (ALS) to forests has been revolutionary during the last decade. This development was facilitated by combining earlier ranging lidar discoveries [1–5], with experience obtained from full-waveform ranging radar [6,7] to new airborne laser scanning systems which had components such as a GNSS receiver (Global Navigation Satellite System), IMU (Inertial Measurement Unit) and a scanning mechanism. Since the first commercial ALS in 1994, new ALS-based fore...

  13. Ceramic Laser Materials

    Energy Technology Data Exchange (ETDEWEB)

    Soules, T F; Clapsaddle, B J; Landingham, R L; Schaffers, K I

    2005-02-15

    Transparent ceramic materials have several major advantages over single crystals in laser applications, not the least of which is the ability to make large aperture parts in a robust manufacturing process. After more than a decade of working on making transparent YAG:Nd, Japanese workers have recently succeeded in demonstrating samples that performed as laser gain media as well as their single crystal counterparts. Since then several laser materials have been made and evaluated. For these reasons, developing ceramic laser materials is the most exciting and futuristic materials topic in today's major solid-state laser conferences. We have established a good working relationship with Konoshima Ltd., the Japanese producer of the best ceramic laser materials, and have procured and evaluated slabs designed by us for use in our high-powered SSHCL. Our measurements indicate that these materials will work in the SSHCL, and we have nearly completed retrofitting the SSHCL with four of the largest transparent ceramic YAG:Nd slabs in existence. We have also begun our own effort to make this material and have produced samples with various degrees of transparency/translucency. We are in the process of carrying out an extensive design-of-experiments to establish the significant process variables for making transparent YAG. Finally because transparent ceramics afford much greater flexibility in the design of lasers, we have been exploring the potential for much larger apertures, new materials, for example for the Mercury laser, other designs for SSHL, such as, edge pumping designs, slabs with built in ASE suppression, etc. This work has just beginning.

  14. Laser gingivectomy for pediatrics.

    Science.gov (United States)

    Kelman, Michelle M; Poiman, David J; Jacobson, Barry L

    2010-01-01

    Traditional gingivectomy procedures have been a challenge for pediatric dentists who confront issues of patient cooperation and discomfort. Treatment of pediatric patients must involve minimal operative and postoperative discomfort. Laser soft-tissue surgery has been shown to be well accepted by children. For the pediatric patient, the greatest advantage of the laser is the lack of local anesthesia injection and the associated pre- and postoperative discomfort. The following case report describes a gingivectomy procedure performed on a 14-year-old female.

  15. Laser Hazards Bibliography

    Science.gov (United States)

    1989-10-31

    1954). 292. Van Liempt, J. A. M. and De Vriend, J. A., Pupillenmessungen Bei Monochromatischem Licht, Physica, 7: 10 (December 1940 ). 293. Van Meeteren...120. Mohan, K., and James, R. H.! High accuracy laser power measurements: a scale comparison, Appl Opt, 18(12). 1937- 1940 (1979). 121. Moseley, H...University of Tokyo Press (1975). 2. Golovin , G. V., Effect of laser radiation on the morphological makeup of the peripheral blood and bone marrow

  16. Laser cooling of solids

    Energy Technology Data Exchange (ETDEWEB)

    Epstein, Richard I [Los Alamos National Laboratory; Sheik-bahae, Mansoor [UNM

    2008-01-01

    We present an overview of solid-state optical refrigeration also known as laser cooling in solids by fluorescence upconversion. The idea of cooling a solid-state optical material by simply shining a laser beam onto it may sound counter intuitive but is rapidly becoming a promising technology for future cryocooler. We chart the evolution of this science in rare-earth doped solids and semiconductors.

  17. Estudio observacional prospectivo con insulina detemir en pacientes con diabetes mellitus tipo 2 mal controlados que inician por primer vez tratamiento con insulina (estudio SOLVE

    Directory of Open Access Journals (Sweden)

    Domingo Orozco-Beltrán

    2016-02-01

    Conclusiones: En esta cohorte de pacientes con diabetes mellitus tipo 2 recientemente insulinizados, la insulina detemir (una vez al día mejoró el control glucémico, con baja incidencia de hipoglucemia y una reducción significativa del peso.

  18. Verification of a characterization method of the laser-induced selective activation based on industrial lasers

    DEFF Research Database (Denmark)

    Zhang, Yang; Hansen, Hans Nørgaard; Tang, Peter T.

    2013-01-01

    In this article, laser-induced selective activation (LISA) for subsequent autocatalytic copper plating is performed by several types of industrial scale lasers, including a Nd:YAG laser, a UV laser, a fiber laser, a green laser, and a short pulsed laser. Based on analysis of all the laser-machine...

  19. High-energy molecular lasers self-controlled volume-discharge lasers and applications

    CERN Document Server

    Apollonov, V V

    2016-01-01

    This book displays the physics and design of high-power molecular lasers. The lasers described are self-controlled volume-discharge lasers. The book explains self-sustained discharge lasers, self-initiated discharge lasers and technical approaches to laser design. Important topics discussed are laser efficiency, laser beam quality and electric field homogeneity. The book contains many new innovative applications.

  20. El deporte en personas con discapacidad

    OpenAIRE

    2015-01-01

    L'esport en persones amb discapacitat és un reportatge esportiu que parla de persones que sofreixen alguna discapacitat. A través de l'experiència d'una nadadora es donarà a conèixer una mica més com és aquest esport des de dins. L'història d'aquesta nadadora mostrarà els valors que té la pràctica d'aquest esport. Què aporta l'esport en les seves vides a nivell físic i emocional. L'objectiu d'aquest projecte es aconseguir la sensibilització de l'espectador cap aquest tema i que aquestes perso...

  1. Entrevista con Emilio Lledó.

    Directory of Open Access Journals (Sweden)

    - Consejo de Redacción

    1995-01-01

    Full Text Available Nacido en Sevilla en 1927, el filósofo español más hondo y discreto de la actualidad es también una de las figuras más solventes de nuestras letras. Lledó hizo sus primeros estudios en Madrid durante la guerra civil, licenciándose luego en 1952. Becado a continuación por la Fundación Humboldt, se instala en Heidelberg y estudia con los más grandes filósofos y filólogos del momento, Gadamer, LOwith, Dirlmeier y Regenbogen, discípulo este último de Wilamowitz. Emilio Lledó permaneció allí hasta 1962, como docente ya en los últimos cuatro cursos de su estancia alemana. Con todo, retoma a España, y, dado su apasionamiento por la enseñanza, se le reconoce como uno de los verdaderos maestros españoles: en Valladolid primero; desde 1964, en las universidades de La Laguna o Barcelona, como catedrático de Historia de la Filosofía, y. más tarde, en la UNED de Madrid, donde actualmente enseña. Fue nombrado, en 1988, miembro vitalicio del Instituto para Estudios Avanzados en Berlín, en donde vivió un año, y de nuevo, tras la concesión del Premio Alexander van Humboldt por el gobierno alemán, en 1990, fue invitado a investigar durante otro año en esa capital. Y ocupa un sillón de la Academia Española de la Lengua, tras leer su discurso de entrada, Las palabras en su espejo, en noviembre de 1994, un año después de su elección. Excelente cultivador de nuestra lengua -sus libros, claros y rigurosos, se alejan de la expresión académica-, Lledó ha traducido varios textos del alemán y del griego (es especialista en Platón, Aristóteles y Epicuro e intenta siempre revitalizar el diálogo entre el pasado y el presente. Los lectores de Emilio Lledó empezaron a conocerle, en los setenta, con Filosofía y lenguaje; La filosofía, hoy (traducido al francés de inmediato y Lenguaje e historia. Pero La memoria del logos y El epicureísmo, una filosofía del cuerpo, del gozo y de la amistad, ambos de 1984, consagran a su autor; y

  2. Estudio de pacientes colombianos con homocistinuria

    Directory of Open Access Journals (Sweden)

    Ugarte M.

    2001-06-01

    Full Text Available La homocistinuria es una alteración bioquímica producida por causas genéticas como son la deficiencia de alguna de las enzimas involucradas en el metabolismo de metionina u homocisteína: Cistationina b sintasa, 5-10 Metilentetrahidrofolato reductasa, o Metionina sintasa al igual que a deficiencias nutricionales y asocio a otras patologías como son la enfermedad renal y problemas  vasculares. El objetivo de este trabajo es la identificación de la deficiencia bioquímica en pacientes con homocistinuria, mediante la cuantificación de las enzimas involucradas, utilizando como muestras fibroblastos y linfocitos.

  3. Factores relacionados con el aborto en yeguas

    OpenAIRE

    Alejandro Córdova Izquierdo

    2006-01-01

    El aborto es la interrupción de la gestación con expulsión de un feto no viable que, en el caso de las yeguas, es la expulsión del producto antes del día 290 de gestación. Los signos que preceden a un aborto son semejantes a los de un parto normal; sin embargo la intensidad de éstos dependerá del tiempo de la gestación, entre más avanzada se encuentre la gestación, más intensos serán los signos. Existen muchos factores que predisponen al aborto. Los enfriamientos bruscos pueden dar origen a u...

  4. Ejemplos Nacionales relacionados con la Crisis

    Directory of Open Access Journals (Sweden)

    Nelson Loustaunau

    2014-04-01

    Full Text Available Buenas noches, inicialmente me voy a permitir una licencia, voy a excederme del tema que se me había confiado, el cual era tomar ejemplos nacionales relacionados con la crisis. ¿Por qué me tomo esta libertad?, por un motivo muy sencillo, si uno solamente mira el panorama nacional, puede no comprender la dimensión del problema a nivel mundial, y puede no comprender si realmente nuestro país está haciendo las cosas bien o no.Veamos, nosotros identificamos cinco tipos de medidas básicas tomadas en relación al Derecho del Trabajo, o a la salvaguarda de puestos de trabajo frente a la crisis. 

  5. Accesibilidad digital para usuarios con limitaciones visuales

    Directory of Open Access Journals (Sweden)

    Toledo, Gabriela Alejandra

    2013-04-01

    Full Text Available El presente trabajo persigue como objetivos: recapitular y analizar los principios básicos de diseño para el desarrollo de tecnologías inclusivas; evaluar ventajas y desventajas en el uso del programa lector de pantalla (JAWS al acceder a entornos comunicacionales, desde las variables de navegabilidad, interoperabilidad, usabilidad y colaboración en la cognición; derivar sugerencias acerca del diseño de entornos de aprendizaje colaborativo, de modo de lograr una mayor efectividad de esta herramienta digital, aplicada a personas con limitaciones en la visión en diverso grado; redactar un manual complementario de orientaciones que facilite el uso de este instrumento inclusivo, aplicado a entornos de enseñanza/ aprendizaje colaborativo.

  6. Cenizas, cementos y hormigones con cenizas

    Directory of Open Access Journals (Sweden)

    Calleja, José

    1982-09-01

    Full Text Available This paper describes the chemical composition and the morfological nature of pulverized coal ashes, as well as their physical characteristics. Their influences —actions and effects— on the main properties and behaviour of cements and concretes, and the more adequate conditions for their efficient use un them are also described.

    En este trabajo se exponen la composición química y la naturaleza morfológica de las cenizas pulverulentas de los carbones, así como sus características físicas. Se describen asimismo sus influencias —acciones y efectos— sobre las principales propiedades y comportamientos más importantes de los cementos y de los hormigones, así como las condiciones más idóneas para su más eficaz empleo con y en ellos.

  7. con enfermedades crónicas

    Directory of Open Access Journals (Sweden)

    Stefano Vinaccia

    2005-01-01

    Full Text Available El objetivo de la siguiente revisión teórica fue estudiar el impacto de las variables psicosociales sobre la calidad de vida de personas con enfermedades crónicas. Se plantea el concepto de salud como un comportamiento asociado al estilo de vida; se define el concepto de calidad de vida y sus principales aspectos multidimensionales; se justifica la importancia de evaluar la calidad de vida en enfermos crónicos. Adicionalmente, se resumen algunos trabajos en los que se ha evaluado el importante papel que juegan diferentes variables psicológicas y sociales en el mantenimiento, recuperación o pérdida de la salud en cinco enfermedades crónicas: infarto, diabetes, cáncer, VIH-SIDA, insuficiencia renal.

  8. Laser Scanning in Forests

    Directory of Open Access Journals (Sweden)

    Håkan Olsson

    2012-09-01

    Full Text Available The introduction of Airborne Laser Scanning (ALS to forests has been revolutionary during the last decade. This development was facilitated by combining earlier ranging lidar discoveries [1–5], with experience obtained from full-waveform ranging radar [6,7] to new airborne laser scanning systems which had components such as a GNSS receiver (Global Navigation Satellite System, IMU (Inertial Measurement Unit and a scanning mechanism. Since the first commercial ALS in 1994, new ALS-based forest inventory approaches have been reported feasible for operational activities [8–12]. ALS is currently operationally applied for stand level forest inventories, for example, in Nordic countries. In Finland alone, the adoption of ALS for forest data collection has led to an annual savings of around 20 M€/year, and the work is mainly done by companies instead of governmental organizations. In spite of the long implementation times and there being a limited tradition of making changes in the forest sector, laser scanning was commercially and operationally applied after about only one decade of research. When analyzing high-ranked journal papers from ISI Web of Science, the topic of laser scanning of forests has been the driving force for the whole laser scanning research society over the last decade. Thus, the topic “laser scanning in forests” has provided a significant industrial, societal and scientific impact. [...

  9. Laser double Doppler flowmeter

    Science.gov (United States)

    Poffo, L.; Goujon, J.-M.; Le Page, R.; Lemaitre, J.; Guendouz, M.; Lorrain, N.; Bosc, D.

    2014-05-01

    The Laser Doppler flowmetry (LDF) is a non-invasive method for estimating the tissular blood flow and speed at a microscopic scale (microcirculation). It is used for medical research as well as for the diagnosis of diseases related to circulatory system tissues and organs including the issues of microvascular flow (perfusion). It is based on the Doppler effect, created by the interaction between the laser light and tissues. LDF measures the mean blood flow in a volume formed by the single laser beam, that penetrate into the skin. The size of this measurement volume is crucial and depends on skin absorption, and is not directly reachable. Therefore, current developments of the LDF are focused on the use of always more complex and sophisticated signal processing methods. On the other hand, laser Double Doppler Flowmeter (FL2D) proposes to use two laser beams to generate the measurement volume. This volume would be perfectly stable and localized at the intersection of the two laser beams. With FL2D we will be able to determine the absolute blood flow of a specific artery. One aimed application would be to help clinical physicians in health care units.

  10. Modelización financiera con Excel

    Directory of Open Access Journals (Sweden)

    Lafuente Robledo, M.

    1998-01-01

    Full Text Available La enseñanza de la Matemática de las Operaciones Financieras ha experimentado durante la década de los noventa una transformación profunda como consecuencia de la progresiva introducción de los programas informáticos. Las hojas de cálculo, dada su gran facilidad de uso, su flexibilidad y su utilización generalizada, han sido una de las herramientas disponibles más potentes para el tratamiento de problemas financieros. De ahí que su incorporación a los programas docentes de esta disciplina se hayan convertido en una norma casi obligada para garantizar la calidad de la enseñanza en esta materia. No obstante, es preciso tener en cuenta que para aplicaciones de alto nivel se requieren programas más especializados (por ejemplo, para gestión de carteras y que cada vez están más extendidas otras herrramientas informáticas de cálculo avanzado como los programas de cálculo numérico (por ejemplo, las aplicaciones financieras específicas de Matlab o de cálculo simbólico (Mathematica, Maple, Matlab, Derive, etc.. De ahí que la hoja de cálculo haya dejado de ser el único programa informático de uso generalizado para el tratamiento de operaciones financieras, y que progresivamente sea preciso incorporar las nuevas aplicaciones en los curricula del alumno. La utilización de las hojas de cálculo en la modelización de problemas de matemática financiera representa importantes ventajas didácticas: · Dado el carácter eminentemente práctico de la misma, simplifica en gran medida la materia a impartir, ya que con los principios y razonamientos elementales permite prescindir del desarrollo de buen número de las fórmulas que la matemática financiera plantea para realizar valoraciones. · Como consecuencia se produce un gran ahorro de tiempo en cuanto a las necesidades de clases magistrales, lo cual permite dedicar más tiempo a la explicación detallada y pormenorizada de los conceptos fundamentales. · Desde el punto de vista

  11. Lasers '92; Proceedings of the International Conference on Lasers and Applications, 15th, Houston, TX, Dec. 7-10, 1992

    Science.gov (United States)

    Wang, Charles P. (Editor)

    1993-01-01

    Papers from the conference are presented, and the topics covered include the following: x-ray lasers, excimer lasers, chemical lasers, high power lasers, blue-green lasers, dye lasers, solid state lasers, semiconductor lasers, gas and discharge lasers, carbon dioxide lasers, ultrafast phenomena, nonlinear optics, quantum optics, dynamic gratings and wave mixing, laser radar, lasers in medicine, optical filters and laser communication, optical techniques and instruments, laser material interaction, and industrial and manufacturing applications.

  12. Lasers in endodontics: an overview

    Science.gov (United States)

    Frentzen, Matthias; Braun, Andreas; Koort, Hans J.

    2002-06-01

    The interest in endodontic use of dental laser systems is increasing. Developing laser technology and a better understanding of laser effects widened the spectrum of possible endodontic indications. Various laser systems including excimer-, argon+-, diode-, Nd:YAG-, Er:YAG- and CO2-lasers are used in pulp diagnosis, treatment of hypersensitivity, pulp capping, sterilization of root canals, root canal shaping and obturation or apicoectomy. With the development of new delivery systems - thin and flexible fibers - for many different wavelengths laser applications in endodontics may increase. Since laser devices are still relatively costly, access to them is limited. Most of the clinical applications are laser assisted procedures such as the removing of pulp remnants and debris or disinfection of infected root canals. The essential question is whether a laser can provide improved treatment over conventional care. To perform laser therapy in endodontics today different laser types with adopted wavelengths and pulse widths are needed, each specific to a particular application. Looking into the future we will need endodontic laser equipment providing optimal laser parameters for different treatment modalities. Nevertheless, the quantity of research reports from the last decade promises a genuine future for lasers in endodontics.

  13. Cognitive enhancement by transcranial laser stimulation and acute aerobic exercise.

    Science.gov (United States)

    Hwang, Jungyun; Castelli, Darla M; Gonzalez-Lima, F

    2016-08-01

    This is the first randomized, controlled study comparing the cognitive effects of transcranial laser stimulation and acute aerobic exercise on the same cognitive tasks. We examined whether transcranial infrared laser stimulation of the prefrontal cortex, acute high-intensity aerobic exercise, or the combination may enhance performance in sustained attention and working memory tasks. Sixty healthy young adults were randomly assigned to one of the following four treatments: (1) low-level laser therapy (LLLT) with infrared laser to two forehead sites while seated (total 8 min, 1064 nm continuous wave, 250 mW/cm(2), 60 J/cm(2) per site of 13.6 cm(2)); (2) acute exercise (EX) of high-intensity (total 20 min, with 10-min treadmill running at 85-90 % VO2max); (3) combined treatment (LLLT + EX); or (4) sham control (CON). Participants were tested for prefrontal measures of sustained attention with the psychomotor vigilance task (PVT) and working memory with the delayed match-to-sample task (DMS) before and after the treatments. As compared to CON, both LLLT and EX reduced reaction time in the PVT [F(1.56) = 4.134, p = 0.01, η (2)  = 0.181] and increased the number of correct responses in the DMS [F(1.56) = 4.690, p = 0.005, η (2)  = 0.201], demonstrating a significant enhancing effect of LLLT and EX on cognitive performance. LLLT + EX effects were similar but showed no significantly greater improvement on PVT and DMS than LLLT or EX alone. The transcranial infrared laser stimulation and acute aerobic exercise treatments were similarly effective for cognitive enhancement, suggesting that they augment prefrontal cognitive functions similarly.

  14. Validez de la Escala de Memoria Wechsler con una muestra previamente diagnosticada con enfermedad de Alzheimer

    Directory of Open Access Journals (Sweden)

    Aurealis T. Báez

    1995-01-01

    Full Text Available El presente estudio fue un intento inicial y exploratorio de traducción y adaptación de la Escala de Memoria Wechsler Forma 1(Wechsler, 1945 en una muestra de origen puertorriqueño. Se postuló que en todas las subescalas de la Escala de Memoria Wechsler habría diferencias significativas entre las puntuaciones obtenidas por los pacientes previamente diagnosticados con la enfermedad de Alzheimer y el grupo de personas neurológicamente normales. El grupo previamente diagnosticado con la enfermedad de Alzheimer fue provisto por un neurólogo independiente del estudio. La muestra del estudio estuvo constituida por 20 pacientes con una edad promedio de 72 años y 20 personas neurológicamente normales con una edad promedio de 66 años. Se le administraron tres instrumentos, un cuestionario de datos sociodemográficos, el Barranquilla Rapid Survey Intelligence Text (BARSIT y una traducción adaptada a Puerto Rico de la Escala de Memoria Wechsler FonnaI original de 1945. Los resultados arrojaron diferencias significativas entre las puntuaciones del grupo de pacientes y el grupo neurológicamente normal en todas las subescalas de la Escala de Memoria Wechsler con excepción de la subescala de Memoria Visual. Las puntuaciones del grupo diagnosticado fueron más bajas que las del grupo normal. Los resultados apoyan la sensibilidad de esta escala en la medición de las alteraciones de la memoria relacionadas con la enfermedad de Alzheimer. Las implicaciones de este estudio podrían estar relacionadas a tres áreas de importancia dentro del campo de la psicología y neuropsicología clínicas las cuales son: la evaluación, el diagnóstico y el tratamiento de estos pacientes y su relevancia en la comprensión, manejo y calidad de vida de los mismos

  15. Femtosecond Fiber Lasers

    Science.gov (United States)

    Bock, Katherine J.

    This thesis focuses on research I have done on ytterbium-doped femtosecond fiber lasers. These lasers operate in the near infrared region, lasing at 1030 nm. This wavelength is particularly important in biomedical applications, which includes but is not limited to confocal microscopy and ablation for surgical incisions. Furthermore, fiber lasers are advantageous compared to solid state lasers in terms of their cost, form factor, and ease of use. Solid state lasers still dominate the market due to their comparatively high energy pulses. High energy pulse generation in fiber lasers is hindered by either optical wave breaking or by multipulsing. One of the main challenges for fiber lasers is to overcome these limitations to achieve high energy pulses. The motivation for the work done in this thesis is increasing the output pulse peak power and energy. The main idea of the work is that decreasing the nonlinearity that acts on the pulse inside the cavity will prevent optical wave breaking, and thus will generate higher energy pulses. By increasing the output energy, ytterbium-doped femtosecond fiber lasers can be competitive with solid state lasers which are used commonly in research. Although fiber lasers tend to lack the wavelength tuning ability of solid state lasers, many biomedical applications take advantage of the 1030 microm central wavelength of ytterbium-doped fiber lasers, so the major limiting factor of fiber lasers in this field is simply the output power. By increasing the output energy without resorting to external amplification, the cavity is optimized and cost can remain low and economical. During verification of the main idea, the cavity was examined for possible back-reflections and for components with narrow spectral bandwidths which may have contributed to the presence of multipulsing. Distinct cases of multipulsing, bound pulse and harmonic mode-locking, were observed and recorded as they may be of more interest in the future. The third

  16. Laser assisted {alpha} decay

    Energy Technology Data Exchange (ETDEWEB)

    Castaneda Cortes, Hector Mauricio

    2012-02-01

    Excited or short-lived nuclei often decay by emitting alpha particles that are assumed to be preformed inside the nucleus and confined in the nuclear potential well. In this picture, {alpha} decay refers to the tunneling of the alpha particle through the potential barrier. In this thesis we investigate for the first time how strong laser fields can assist the tunneling of the alpha particle and thus influence the nuclear decay. Generally speaking, laser-assisted {alpha} decay can be described as laser-assisted tunneling of a quasistationary state, i.e, a slowly decaying state. Our theoretical treatment is developed starting from the complex trajectory formulation of the well-known strong-field approximation used to describe laser-induced ionization. We extend this formulation and develop a method to treat the decay of quasistationary states. The effect of both static and optical and X-ray monochromatic fields on the lifetimes and {alpha}-particle emission spectra are investigated for a number of {alpha}-emitting nuclei. We find that even at strong intensities, the laser-induced acceleration of the {alpha} decay is negligible, ranging from a relative modification in the decay rate of 10{sup -3} for static fields of electric field strengths of 10{sup 15} V/m, to 10{sup -8} for strong optical fields with intensities of 10{sup 22} W/cm{sup 2}, and to 10{sup -6} for strong X-ray fields with laser intensities around 10{sup 24} W/cm{sup 2}. However, the effect of the external field is visible in the spectrum of emitted alpha particles, leading in the case of optical fields even to rescattering phenomena for intensities approaching 6 x 10{sup 22} W/cm{sup 2}. The dynamics of the alpha particle in laser fields of intensities below the rescattering limit is investigated.

  17. Surgical Lasers In Gynecology

    Science.gov (United States)

    Schellhas, Helmut F.; Barnes, Alfonso E.

    1982-12-01

    Multipurpose surgical CO2 lasers marketed in the USA have been developed to be applicable to a variety of surgical procedures in many surgical fields. They are all suited for endoscopic surgical procedures and can be fitted to all standard surgical microscopes. They all can adjust the focal length of the laser beam to the different standard focal lengths of the surgical microscope which for instance in laryngoscopy is 400 mm and in colposcopy 300 mm. One laser instrument can even change the spot size in a given focal distance which is very advantageous for some microsurgical procedures (Merrimack Laboratories 820). All multipurpose surgical CO2 laser systems provide a multi-articulated surgical arm for free-hand surgery. The surgical arms are cumbersome to use but they are adapted to the surgeons needs with ingenuity. The practicality of the multi-articulated surgical arms depends mostly on the distance of the handpiece from the surgical console which now is also overbridged by the laser tube in most surgical laser system. The spot size of the beam is variable in most handpieces by interchangeable lenses which modify the focal distance of the beam and the power density. Another common feature in all systems is a coaxial He-Ne pilot light which provides a red spot which unfortunately becomes invisible in a bleeding surgical field. Most surgical laser systems have a spacial mode of TEM 00 which is essential for incisional surgery. The continuous mode of beam delivery is used for incisional surgery and also for most endoscopic procedures.

  18. Laser safety in the lab

    CERN Document Server

    Barat, Ken L

    2012-01-01

    There is no more challenging setting for laser use than a research environment. In almost every other setting the laser controls count on engineering controls, and human exposure is kept to a minimum. In research, however, the user often manipulates the optical layout and thereby places him or herself in peril, but this does not mean that accidents and injury are unavoidable. On the contrary, laser accidents can be avoided by following a number of simple approaches. [i]Laser Safety in the Lab[/i] provides the laser user and laser safety officer with practical guidelines from housekeeping to ey

  19. Injection-controlled laser resonator

    Science.gov (United States)

    Chang, J.J.

    1995-07-18

    A new injection-controlled laser resonator incorporates self-filtering and self-imaging characteristics with an efficient injection scheme. A low-divergence laser signal is injected into the resonator, which enables the injection signal to be converted to the desired resonator modes before the main laser pulse starts. This injection technique and resonator design enable the laser cavity to improve the quality of the injection signal through self-filtering before the main laser pulse starts. The self-imaging property of the present resonator reduces the cavity induced diffraction effects and, in turn, improves the laser beam quality. 5 figs.

  20. 2008 CONEXPO-CON/AGG%镜头中的CONEXPO-CON/AGG2008

    Institute of Scientific and Technical Information of China (English)

    周贤彪

    2008-01-01

    @@ 于2008年3月11-15日在美国拉斯维加斯会展中心举行的CONEXPO-CON/AGG(建设机械展)和IFPE(动力传动展)圆满闭幕.CONEXPO-CON/AGG有2182家企业参展,展出净面积达21.2万平方米,较上届增长21%;IFPE有469家企业参展,展出净面积达1.2万平方米,较上届增长16%.14.46万人参观展会,其中国际观众2.8万人,占19%,中国、印度、土耳其的观众数量翻倍.

  1. Hepatotoxicidad inducida por azatioprina en paciente con enfermedad de Crohn

    Directory of Open Access Journals (Sweden)

    D. Ruiz-Clavijo

    2013-08-01

    Full Text Available Los inmunosupresores se encuentran entre los grupos farmacológicos con mayor potencial teórico de inducir reacciones adversas, entre ellas las hepáticas. Presentamos el caso de un paciente de 35 años con enfermedad de Crohn en tratamiento con azatioprina por corticodependencia al que se le diagnosticó tras realización de una biopsia hepática de hiperplasia nodular regenerativa secundaria a este tratamiento.

  2. Equinoterapia en niños con autismo

    OpenAIRE

    Martinez Alvernia, Carlos Francisco

    2015-01-01

    Introducción: Autismo es un trastorno del desarrollo caracterizado por compromiso en interacción social, habilidades de lenguaje, presentando rituales con estereotipias. Sin tratamientos curativos, actualmente se buscan terapias alternativas. Un incremento de la literatura científica de terapias asistidas con animales se ha evidenciado, demostrando mejoría en pacientes autistas con la equinoterapia. Objetivo: Realizar una revisión sistemática de la literatura para evaluar efectividad de la eq...

  3. Comportamiento de mezclas asfálticas fabricadas con asfaltos modificados con ceras

    Directory of Open Access Journals (Sweden)

    Oscar Javier Reyes Ortíz

    2013-01-01

    Full Text Available El propósito principal de la investigación fue modificar asfaltos colombianos con ceras naturales para fabricar mezclas asfálticas tibias y establecer su comportamiento mecánico y dinámico. Las mezclas estudiadas corresponden a las denominadas curvas granulometrías md-10 y md-12 del Instituto de Desarrollo Urbano (IDU. El estudio inicio con la caracterización de los materiales a utilizar (granular, asfalto y ceras naturales, seguido de la determinación del porcentaje de adición de ceras y el contenido de asfalto óptimo para fabricar mezclas tibias. Posteriormente se fabricaron y compactaron las mezclas asfálticas a 110, 130 y 150°C para evaluar el efecto del asfalto modificado en su comportamiento mecánico y dinámico. Los ensayos utilizados para medir las propiedades de las mezclas asfálticas fueron la resistencia a la tracción indirecta, la resisten- cia conservada y los módulos resilientes. Del análisis de los resultados se estableció que las ceras naturales utilizadas reducen la viscosidad de los asfaltos y por ende las temperaturas de fabricación y compactación de las mezclas, reduciendo significativamente el consumo de energía y la generación de gases de efecto invernadero. De otra parte, se estableció que las propiedades mecánicas y dinámicas estudiadas a las mezclas asfálticas con asfalto modificado con ceras, son similares a las mezclas convencionales, estableciendo la viabilidad para su aplicación y uso.

  4. Variable emissivity laser thermal control system

    Science.gov (United States)

    Milner, Joseph R.

    1994-01-01

    A laser thermal control system for a metal vapor laser maintains the wall mperature of the laser at a desired level by changing the effective emissivity of the water cooling jacket. This capability increases the overall efficiency of the laser.

  5. Ultrashort pulse laser technology laser sources and applications

    CERN Document Server

    Schrempel, Frank; Dausinger, Friedrich

    2016-01-01

    Ultrashort laser pulses with durations in the femtosecond range up to a few picoseconds provide a unique method for precise materials processing or medical applications. Paired with the recent developments in ultrashort pulse lasers, this technology is finding its way into various application fields. The book gives a comprehensive overview of the principles and applications of ultrashort pulse lasers, especially applied to medicine and production technology. Recent advances in laser technology are discussed in detail. This covers the development of reliable and cheap low power laser sources as well as high average power ultrashort pulse lasers for large scale manufacturing. The fundamentals of laser-matter-interaction as well as processing strategies and the required system technology are discussed for these laser sources with respect to precise materials processing. Finally, different applications within medicine, measurement technology or materials processing are highlighted.

  6. Televisión con cultura / cultura con televisión

    Directory of Open Access Journals (Sweden)

    Donacio Bartolomé Crespo

    2004-01-01

    Full Text Available Es evidente la necesidad de valorar los programas con intencionalidad cultural, especialmente en la televisión pública, atendiendo a los objetivos que se proponen en su estructura y en las consecuencias no previstas que se derivan de su aplicación. De igual modo, los resultados de dichas investigaciones deben ser considerados por los responsables de la programación. La mayoría de los casos estudiados coincide en la escasez de programas con contenido cultural y en la poca originalidad de los existentes. Se percibe descontento respecto al contenido de los programas que se emiten en la actualidad y aprecio por aquellos con contenido cultural, pero los televidentes reconocen que acaban viendo programas de entretenimiento, debido a lo poco atractivos que resultan los que consideran más importantes o a la mala ubicación que éstos tienen dentro de la programación, ya que se emiten a altas horas de la madrugada o a principios de la mañana.

  7. MACROHEMATURIA PERSISTENTE Y ANEMIZANTE RESUELTA CON ENALAPRIL

    Directory of Open Access Journals (Sweden)

    Imperiali N

    2005-12-01

    Full Text Available ABSTRACTHematuria is the presence of an excessive number of red blood cells in the urine (at least three or more erythrocytes in a high-power field in centrifuged urine. It is categorized as microscopic when it is visible only with the aid of a microscope and macroscopic when the urine is tea-colored, pink or even red.Hematuria can result from injury to the kidney or injury to another site in the urinary tract, and renal hematuria can be caused by glomerular or non-glomerular disease.Some clinical and biochemical findings contribute to understand the origin of this problem: the presence of hematuria with clots suggests an urological cause, while the presence of red blood cell casts and/or dysmorphic red blood cells in a urine sample supports a glomerular etiology.In the present report we presented a clinical case of a patient suffering from persistent and anemizing gross hematuria secondary to a mesangial proliferative glomerulonephritis associated with thick glomerular basement membranes which was solved using enalapril.RESUMENLa hematuria es definida como la presencia de por lo menos tres o más eritrocitos por campo en una muestra de orina centrifugada, pudiéndose a su vez clasificar este problema en microhematuria: cuando sólo puede ser detectado con la ayuda del microscopio o macrohematuria cuando a simple vista se observa una orina color te, rosada o francamente roja.La hematuria puede ser producto de una lesión a nivel de la vía urinaria o a nivel renal, pudiendo ser esta última de etiología glomerular o no glomerular.Algunos datos clínicos y bioquímicos contribuyen a la comprensión acerca del origen de la hematuria: la presencia de coágulos en la orina sugiere una causa urológica, mientras que la presencia de cilindros eritrocitarios y/o eritrocitos dismórficos o acantocitos en la misma apoyan una etiología glomerular.En este reporte, presentamos un caso clínico de un paciente portador de una macrohematuria anemizante

  8. Seguridad contra incendios en edificios con atrio

    Directory of Open Access Journals (Sweden)

    Faller, George

    2003-06-01

    Full Text Available Atria are commonly used in the design of buildings to improve the environment of the space. Nevertheless the current Spanish codes do not address the fire safety concerns associated with this type of building. A new draft code, the "Código Técnico de la Edificación .. (CTE, proposes a series of measures to address the issue of fire safety in atria, based on the approach adopted by the British atrium codeo. In order to simplify the application of the measures, buildings are classified according to use and appropriate measures are presented in a tabulated format. As could be expected from such an approach, the simplification of the pro cess imposes limits on design flexibility, and given a set of prescribed solutions, the designer would often not be able to achieve the ideal building form. This article discusses the limits of a prescriptive approach to fire safety in buildings with atria , and describes an alternative approach based on fire engineering principles that offers the architect more design flexibilty .Cada vez se utilizan más atrios para mejorar el ambiente dentro de los edificios. Sin embargo, las normativas actualmente vigentes en España no ofrecen soluciones para abordar los riesgos -en caso de incendio- en este tipo de edificios. El borrador del nuevo Código Técnico de la Edificación (CTE plantea una serie de medidas de seguridad contra incendios en atrios, basada en el planteamiento seguido en por las normas británicas. Para simplificar la aplicación de dichas medidas, se fijan algunas características del edificio y se ofrecen soluciones basadas en medidas obtenidas de una tabla . Como es era de esperar con este tipo de planteamiento, la facilidad de aplicación va en detrimento de la flexibilidad, y resulta que con las soluciones prescritas el diseñador no puede conseguir la forma deseada en el edificio. Este artículo trata de ilustrar las restricciones que conllevan un planteamiento prescriptivo para la seguridad

  9. Programación declarativa cualificada con restricciones

    OpenAIRE

    Romero Díaz, Carlos Alberto

    2011-01-01

    La incorporación del razonamiento con incertidumbre a la programación declarativa y, en especial, a la programación lógica ha sido objeto de investigación en las últimas décadas. En este periodo, se han aportado diversas propuestas con este propósito así como diferentes aplicaciones prácticas de estas propuestas. Al mismo tiempo, los esquemas CLP y CFLP de la programación lógica con restricciones y la programación lógico-funcional con restricciones, respectivamente, se han convertido en poten...

  10. Amiloidosis renal en paciente con osteomielitis de extremidad inferior

    Directory of Open Access Journals (Sweden)

    María Vicente Santos

    2012-09-01

    Full Text Available La amiloidosis secundaria (AA sistémica es una entidad frecuente, asociada con enfermedades inflamatorias e infecciones de larga evolución, así como con algunas neoplasias. Presentamos el caso de un varón de 58 años, con antecedente de úlcera en miembro inferior derecho de más de 30 años de evolución y con síndrome nefrótico secundario a amiloidosis AA.

  11. Tratamiento periodontal en un paciente con bulimia y anorexia

    OpenAIRE

    Dolonguevich, Evelyn Ruth; Boero López, Edgardo

    2009-01-01

    En el caso clínico se trató periodontalmente a la paciente C. J., con diagnóstico de bulimia y anorexia nerviosa purgativa. Se destacó el importante trabajo de motivación, que dio como resultado una respuesta excelente en su salud bucal. Se contó con la posibilidad de colocar implantes dentales con buen resultado postoperatorio, lo cual es promisorio en cuanto a lograr rehabilitarla con una solución fija, que no sufrirán de patología...

  12. Laser Science and Applications

    Science.gov (United States)

    El-Nadi, Lotfia M.; Mansour, Mohy S.

    2010-04-01

    Attosecond high harmonic pulses: generation and characterization / C. H. Nam and K. T. Kim -- High power lasers and interactions / C. Chatwin and R. Young -- Laser accelerators / L. M. El-Nadi ... [et al.] -- Energy levels, oscillator strengths, lifetimes, and gain distributions of S VII, CI VIII, and Ar IX / Wessameldin. S. Abdelaziz and Th. M. El-Sherbini -- The gain distribution according to theoretical level structure and decay dynamics of W[symbol] / H. M. Hamed ... [et al.] -- Raman spectroscopy and low temperature photoluminescence ZnSe[symbol]Te[symbol] ternary alloys / A. Salah ... [et al.] -- Automated polarization-discrimination technique to minimize lidar detected skylight background noise, part I / Y. Y. Hassebo, K. Elsayed and S. Ahmed -- Laser interferometric measurements of the physical properties for He, Ne gases and their mixture / N. M. Abdel-Moniem ... [et al.] -- Analytical studies of laser beam propagation through the atmosphere / M. I. El-Saftawy, A. M. Abd El-Hamed and N. Sh. Kalifa -- Laser techniques in conservation of artworks: problems and breakthroughs / R. Salimbeni and S. Siano -- Technology-aided heritage conservation laser cleaning for buildings / M. S. Nada -- Technology significance in conservation of the built heritage 3D visualization impact / M. S. Nada -- Simulation of optical resonators for Vertical-Cavity Surface-Emitting Lasers (VCSEL) / M. S. Mansour ... [et al.] -- Optical design alternatives: a survey study / A. A. K. Ismail, I. A. S. Ismail and S. H. Ahmed -- Materials for digital optical design; a survey study / A. A. K. Ismail, I. A. S. Ismail and S. H. Ahmed -- Proposed design for optical digital circuits / A. A. K. Ismail, I. A. S. Ismail and S. H. Ahmed -- Photo-induced effect on bacterial cells / M. H. El Batanouny ... [et al.] -- Laser and non-coherent light effect on peripheral blood normal and acute lymphoblastic leukemic cells by using different types of photosensitizers / M. H. El Batanouny ... [et al

  13. [The use of lasers in dermatology].

    Science.gov (United States)

    Lecocq, C; Pirard, D; del Marmol, V; Berlingin, E

    2013-01-01

    Albert Einstein is undoubtedly the father of lasers. But it is not until 1964 that the first dermatological lasers were introduced. The Nd-YAG laser, the CO2 laser were developed by Kumar Patel. In a 40 year period lasers not only were diversified but have also become safer and miniaturized. This article hopes to strengthen general practionners' and specialist's knowledge of the different categories of available lasers. The most frequently used ones are ablative lasers (CO2-Erbium), vascular lasers (Nd-YAG, KTP, pulsed dye laser) and the pigment lasers (Q-Switched Nd-YAG, Alexandrite). A description of these lasers and their indications in dermatology will be discussed.

  14. Atmospheric Laser Communication.

    Science.gov (United States)

    Fischer(, Kenneth W.; Witiw, Michael R.; Baars+, Jeffrey A.; Oke, T. R.

    2004-05-01

    Atmospheric laser communication, often referred to as free-space optics (FSO) or free-space laser (FSL) communication, is similar to fiber optic cable in terms of carrier wavelength and bandwidth capability, but data are transmitted directly through the atmosphere via laser beams over paths from a few meters to 4 km or longer. FSL uses lasers in the near-infrared spectrum, typically at wavelengths of 850 or 1550 nm. Given these wavelengths, atmospheric attenuation must be considered, and an adequate margin of optical power (dB) must exist to support high system availability (the percentage of time that an FSL link is in operation, typically 99.9%). A visual range of 100 m can attenuate a laser beam at a rate of nearly 130 dB km-1. For short links (rain, and snow frequently become issues. To address these issues, long-term climate data are analyzed to determine the frequency of occurrence of low visibilities and low-cloud ceilings. To estimate availability at a site of interest, adjustments to airport climate data are made to accommodate differences in altitude, geography, and the effects of the urban heat island. In sum, communication via FSL is a feasible alternative to fiber optic cable when atmospheric conditions are considered and properly analyzed.(Current affiliation: The Boeing Company, Seattle, Washington+Current affiliation: Department of Atmospheric Sciences, University of Washington, Seattle, Washington

  15. Novel oral laser applications

    Science.gov (United States)

    Yousif, A.; Strassl, M.; Beer, F.; Verhagen, L.; Wittschier, M.; Wintner, E.

    2007-03-01

    In dental hard tissue ablation, ultra-short laser pulses have proven sufficiently their potential for material ablation with negligible collateral damage providing many advantages. The absence of micro-cracks and the possibility to avoid overheating of the pulp during dental cavity preparation may be among the most important issues, the latter opening up an avenue for potential painless treatment. Beside the evident short interaction time of laser radiation with the irradiated tissue, scanning of the ultra-short pulse trains turned out to be crucial for ablating cavities of required quality and shape. Additionally, long-pulsed laser systems have demonstrated successfully their suitability for decontamination purposes. In this paper, an overview of different indications for laser application in dental therapies in both pulse regimes is presented. A special focus is set on the decontamination of dental implants in periimplantitis therapy. Having employed commercially available long pulse systems for dental applications and ultra-short 330 fs pulses, we present first results for temperature development and corresponding ablation thresholds for dental implants, as in the future more gentle implant cleaning by ultra-short laser pulses could become of interest.

  16. Photonic Molecule Lasers Revisited

    Science.gov (United States)

    Gagnon, Denis; Dumont, Joey; Déziel, Jean-Luc; Dubé, Louis J.

    2014-05-01

    Photonic molecules (PMs) formed by coupling two or more optical resonators are ideal candidates for the fabrication of integrated microlasers, photonic molecule lasers. Whereas most calculations on PM lasers have been based on cold-cavity (passive) modes, i.e. quasi-bound states, a recently formulated steady-state ab initio laser theory (SALT) offers the possibility to take into account the spectral properties of the underlying gain transition, its position and linewidth, as well as incorporating an arbitrary pump profile. We will combine two theoretical approaches to characterize the lasing properties of PM lasers: for two-dimensional systems, the generalized Lorenz-Mie theory will obtain the resonant modes of the coupled molecules in an active medium described by SALT. Not only is then the theoretical description more complete, the use of an active medium provides additional parameters to control, engineer and harness the lasing properties of PM lasers for ultra-low threshold and directional single-mode emission. We will extend our recent study and present new results for a number of promising geometries. The authors acknowledge financial support from NSERC (Canada) and the CERC in Photonic Innovations of Y. Messaddeq.

  17. Moldless casting by laser

    Science.gov (United States)

    McLean, Marc A.; Shannon, G. J.; Steen, William M.

    1997-09-01

    The principle of laser cladding involves the use of high power carbon-dioxide lasers and powder deposition technology to provide wear and corrosion resistant surface coatings to engineering components. By injecting metal powder into a laser generated melt pool on a moving substrate a solidified metal track can be produced. Deposition of successive tracks produces a multi-layer build. Laser direct casting (LDC) utilizes a coaxial nozzle enabling consistent omnidirectional deposition to produce 3D components from a selection of metal powders. The influence of the principal process parameters over the process features namely, powder catchment efficiency, beam shape and build rates are presented with several successfully generated 3D components. Nickel, stainless steel and satellite powders were deposited at laser powders of 0.4 to 1.4 kW and speeds of 500 to 1000 mm/min achieving build rates of 3 to 9 mm3/s. Fully dense metallurgical structures have been produced with no cracking or porosity and powder catchment efficiencies up to 85% have been achieved.

  18. Pulsed inductive HF laser

    Energy Technology Data Exchange (ETDEWEB)

    Razhev, A M; Kargapol' tsev, E S [Institute of Laser Physics, Siberian Branch, Russian Academy of Sciences, Novosibirsk (Russian Federation); Churkin, D S; Demchuk, S V [Novosibirsk State University, Novosibirsk (Russian Federation)

    2016-03-31

    We report the results of experimentally investigated dependences of temporal, spectral and spatial characteristics of an inductive HF-laser generation on the pump conditions. Gas mixtures H{sub 2} – F{sub 2}(NF{sub 3} or SF6{sub 6}) and He(Ne) – H{sub 2} – F{sub 2}(NF{sub 3} or SF{sub 6}) were used as active media. The FWHM pulse duration reached 0.42 μs. This value corresponded to a pulsed power of 45 kW. For the first time, the emission spectrum of an inductive HF laser was investigated, which consisted of seven groups of bands with centres around the wavelengths of 2732, 2736, 2739, 2835, 2837, 2893 and 2913 nm. The cross section profile of the laser beam was a ring with a diameter of about 20 mm and width of about 5 mm. Parameters of laser operation in the repetitively pulsed regime were sufficiently stable. The amplitude instability of light pulses was no greater than 5% – 6%. (lasers)

  19. A gas laser tube

    Energy Technology Data Exchange (ETDEWEB)

    Tetsuo, F.; Tokhikhide, N.

    1984-04-19

    A gas laser tube is described in which contamination of the laser gas mixture by the coolant is avoided, resulting in a longer service life of the mirrors. The holder contains two tubes, one inside the other. The laser gas mixture flows through the internal tube. An electrode is fastened to the holder. The coolant is pumped through the slot between the two tubes, for which a hole is cut into the holder. The external tube has a ring which serves to seal the cavity containing the coolant from the atmosphere. The internal tube has two rings, one to seal the laser gas mixture and the other to seal the coolant. A slot is located between these two rings, which leads to the atmosphere (the atmosphere layer). With this configuration, the degradation of the sealing properties of the internal ring caused by interaction with the atmospheric layer is not reflected in the purity of the laser gas mixture. Moreover, pollution of the mirrors caused by the penetration of the coolant into the cavity is eliminated.

  20. An??lisis de la complejidad sint??ctica de textos producidos por alumnos con baja visi??n, con ceguera y con visi??n normal

    OpenAIRE

    Rodr??guez Fuentes, Antonio

    2005-01-01

    El estudio pretende analizar la complejidad ling????stica num??rica y estructural de textos producidos por alumnos con baja visi??n y ceguera, a trav??s de cuatro ??ndices de complejidad: a) ??ndice de complejidad num??rica, b) ??ndice ponderado de complejidad, c) ??ndice de complejidad estructural de las oraciones y d) ??ndice de complejidad estructural de las proposiciones de las oraciones compuestas. Para ello se han analizado los textos producido por 11 alumnos con hipovisi??n y 6 con ceg...