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  1. Article: Laparoscopic repair of an anterior perineal hernia: a video presentation.

    Furuie, I / Quevedo, A / Tovar, P / Santos, F / Zomer, M / Castro, G / Kondo, W

    Facts, views & vision in ObGyn

    2023  Volume 15, Issue 2, Page(s) 153–155

    Abstract: Background: The perineal hernia is a condition that occurs as a result of a defect in the pelvic diaphragm. It is classified as anterior or posterior, and as either a primary or secondary hernia. The best management of this condition remains ... ...

    Abstract Background: The perineal hernia is a condition that occurs as a result of a defect in the pelvic diaphragm. It is classified as anterior or posterior, and as either a primary or secondary hernia. The best management of this condition remains controversial.
    Objectives: To demonstrate the surgical steps of a laparoscopic repair with mesh of a perineal hernia.
    Materials and methods: A video presentation showing the laparoscopic repair of a recurrent perineal hernia.
    Main outcome measures: A 46-year-old woman with a prior history of a primary perineal hernia repair had complaints of a symptomatic vulvar bulge. Pelvic magnetic resonance imaging showed a 5 cm hernia sac at the right anterior pelvic wall containing adipose tissue. A laparoscopic perineal hernia repair was performed by dissection of the space of Retzius, reduction of the hernial sac, closure of the defect and mesh fixation.
    Results: The laparoscopic repair with mesh of a recurrent perineal hernia is demonstrated.
    Conclusion: We showed that the laparoscopic approach can be an effective and reproducible treatment for perineal hernia.
    Learning objective: Understanding of the surgical steps involved in the laparoscopic repair with mesh of a recurrent perineal hernia.
    Language English
    Publishing date 2023-07-12
    Publishing country Belgium
    Document type Journal Article
    ZDB-ID 2701574-9
    ISSN 2032-0418 ; 2684-4230
    ISSN 2032-0418 ; 2684-4230
    DOI 10.52054/FVVO.15.2.068
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: A mode-locked random laser generating transform-limited optical pulses.

    von der Weid, Jean Pierre / Correia, Marlon M / Tovar, Pedro / Gomes, Anderson S L / Margulis, Walter

    Nature communications

    2024  Volume 15, Issue 1, Page(s) 177

    Abstract: Ever since the mid-1960's, locking the phases of modes enabled the generation of laser pulses of duration limited only by the uncertainty principle, opening the field of ultrafast science. In contrast to conventional lasers, mode spacing in random lasers ...

    Abstract Ever since the mid-1960's, locking the phases of modes enabled the generation of laser pulses of duration limited only by the uncertainty principle, opening the field of ultrafast science. In contrast to conventional lasers, mode spacing in random lasers is ill-defined because optical feedback comes from scattering centres at random positions, making it hard to use mode locking in transform limited pulse generation. Here the generation of sub-nanosecond transform-limited pulses from a mode-locked random fibre laser is reported. Rayleigh backscattering from decimetre-long sections of telecom fibre serves as laser feedback, providing narrow spectral selectivity to the Fourier limit. The laser is adjustable in pulse duration (0.34-20 ns), repetition rate (0.714-1.22 MHz) and can be temperature tuned. The high spectral-efficiency pulses are applied in distributed temperature sensing with 9.0 cm and 3.3 × 10
    Language English
    Publishing date 2024-01-02
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-44315-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Distributed birefringence sensing at 10

    Tovar, Pedro / Wang, Yuan / Chen, Liang / Bao, Xiaoyi

    Optics express

    2022  Volume 30, Issue 18, Page(s) 33156–33169

    Abstract: Brillouin dynamic gratings (BDG) can measure the distributed birefringence of polarization-maintaining fibers (PMF), however, its sensing range is limited by both stimulated Brillouin scattering depletion and fiber losses in PMF, which are significantly ... ...

    Abstract Brillouin dynamic gratings (BDG) can measure the distributed birefringence of polarization-maintaining fibers (PMF), however, its sensing range is limited by both stimulated Brillouin scattering depletion and fiber losses in PMF, which are significantly higher than those in standard single-mode fibers. In this work, we theoretically and experimentally verify that BDG can be sustained over ultra-long distances when assisted by distributed Brillouin amplification, significantly extending the distributed birefringence measurement distance. Using an optical frequency comb pumped by a narrow linewidth laser to both generate and interrogate the amplified BDG, a birefringence measurement accuracy of 7.5 × 10
    Language English
    Publishing date 2022-10-14
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.466212
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Generation of high performance optical chirped pulse for distributed strain sensing application with high strain accuracy and larger measurement range.

    Wang, Yuan / Tovar, Pedro / Chen, Liang / Bao, Xiaoyi

    Optics express

    2022  Volume 30, Issue 11, Page(s) 18518–18529

    Abstract: A photonic approach for generating low frequency drifting noise, arbitrary and large frequency chirping rate (FCR) optical pulses based on the Kerr effect in the nonlinear optical fiber is theoretically analyzed and experimentally demonstrated. Due to ... ...

    Abstract A photonic approach for generating low frequency drifting noise, arbitrary and large frequency chirping rate (FCR) optical pulses based on the Kerr effect in the nonlinear optical fiber is theoretically analyzed and experimentally demonstrated. Due to the Kerr effect-induced sinusoidal phase modulation in the nonlinear fiber, high order Kerr pulse with a large chirping rate is generated. In the concept-proof experiments, the FCR of the m
    Language English
    Publishing date 2022-10-12
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.454913
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Book ; Online: DEFORESTATION DETECTION IN THE AMAZON RAINFOREST WITH SPATIAL AND CHANNEL ATTENTION MECHANISMS

    Tovar, P. / Adarme, M. O. / Feitosa, R. Q.

    eISSN: 2194-9034

    2021  

    Abstract: Deforestation in the Amazon rainforest is an alarming problem of global interest. Environmental impacts of this process are countless, but probably the most significant concerns regard the increase in CO 2 emissions and global temperature rise. Currently, ...

    Abstract Deforestation in the Amazon rainforest is an alarming problem of global interest. Environmental impacts of this process are countless, but probably the most significant concerns regard the increase in CO 2 emissions and global temperature rise. Currently, the assessment of deforested areas in the Amazon region is a manual task, where people analyse multiple satellite images to quantify the deforestation. We propose a method for automatic deforestation detection based on Deep Learning Neural Networks with dual-attention mechanisms. We employed a siamese architecture to detect deforestation changes between optical images in 2018 and 2019. Experiments were performed to evaluate the relevance and sensitivity of hyperparameter tuning of the loss function and the effects of dual-attention mechanisms (spatial and channel) in predicting deforestation. Experimental results suggest that a proper tuning of the loss function might bring benefits in terms of generalisation. We also show that the spatial attention mechanism is more relevant for deforestation detection than the channel attention mechanism. When both mechanisms are combined, the greatest improvements are found, and we reported an increase of 1.06% in the mean average precision over a baseline.
    Subject code 333
    Language English
    Publishing date 2021-06-30
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: A random optical parametric oscillator.

    Tovar, Pedro / von der Weid, Jean Pierre / Wang, Yuan / Chen, Liang / Bao, Xiaoyi

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 6664

    Abstract: Synchronously pumped optical parametric oscillators (OPOs) provide ultra-fast light pulses at tuneable wavelengths. Their primary drawback is the need for precise cavity control (temperature and length), with flexibility issues such as fixed repetition ... ...

    Abstract Synchronously pumped optical parametric oscillators (OPOs) provide ultra-fast light pulses at tuneable wavelengths. Their primary drawback is the need for precise cavity control (temperature and length), with flexibility issues such as fixed repetition rates and marginally tuneable pulse widths. Targeting a simpler and versatile OPO, we explore the inherent disorder of the refractive index in single-mode fibres realising the first random OPO - the parametric analogous of random lasers. This novel approach uses modulation instability (χ
    Language English
    Publishing date 2023-10-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-42452-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Book ; Article ; Online: Intra-Bloc Tariffs and Preferential Margins in Trade Agreements

    Ornelas, Emanuel / Tovar, Patricia

    2021  

    Abstract: We study, theoretically and empirically, how countries choose intra-bloc tariffs and preferential margins when they form Preferential Trade Agreements (PTAs). Our model indicates that countries should set systematically lower preferential margins when ... ...

    Abstract We study, theoretically and empirically, how countries choose intra-bloc tariffs and preferential margins when they form Preferential Trade Agreements (PTAs). Our model indicates that countries should set systematically lower preferential margins when the bloc takes the form of a free trade area (where members set external trade policies independently), relative to a customs union (where members coordinate external tariffs). Moreover, in customs unions (but not necessarily in free trade areas) preferential margins should increase with the supply of partner countries and decrease with the level of preferential imports. These relationships reflect, respec-tively, the internalization of political-economy goals within the bloc and the desire to curb trade diversion. Using a sample that covers most PTAs formed by Latin American countries in the 1990s, when their popularity in the region shot up, we find empirical support for each of those predictions. These findings make clear that the type of PTA matters significantly for the bloc's tariff structure. Our results carry out important implications for the welfare consequences and the social desirability of different types of PTAs.
    Keywords ddc:330 ; F15 ; F13 ; regionalism ; free trade agreements ; customs unions ; tariff complementarity ; Latin America
    Subject code 381
    Language English
    Publisher Munich: Center for Economic Studies and ifo Institute (CESifo)
    Publishing country de
    Document type Book ; Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: Broadband ultrasound sensing based on fused dual-core chalcogenide-PMMA microfibers.

    Wang, Haiyang / Baker, Chams / Kelly, Liam / Tovar, Pedro / Chen, Liang / Bao, Xiaoyi

    Optics express

    2022  Volume 30, Issue 6, Page(s) 8847–8856

    Abstract: High-frequency ultrasound sensors are essential for high-resolution medical ultrasonic imaging and industrial ultrasonic non-destructive monitoring. In this paper, we propose highly sensitive broadband ultrasound sensors based on fused dual-core ... ...

    Abstract High-frequency ultrasound sensors are essential for high-resolution medical ultrasonic imaging and industrial ultrasonic non-destructive monitoring. In this paper, we propose highly sensitive broadband ultrasound sensors based on fused dual-core chalcogenide-polymethyl methacrylate (As
    Language English
    Publishing date 2022-03-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.450734
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: External tariffs under a free-trade area

    Tovar, Patricia

    The journal of international trade & economic development Vol. 23, No. 5/6 , p. 656-681

    2014  Volume 23, Issue 5, Page(s) 656–681

    Author's details Patricia Tovar
    Language English
    Size graph. Darst.
    Publisher Routledge
    Publishing place London
    Document type Article
    ZDB-ID 913003-2
    ISSN 0963-8199
    Database ECONomics Information System

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  10. Article ; Online: Bibliografía

    Hermes Tovar P.

    Anuario Colombiano de Historia Social y de la Cultura, Vol 0, Iss 6-7, Pp 157-

    2012  Volume 222

    Abstract: MARGARITA GONZÁLEZ. El Resguardo en el Nuevo Reino de Granada. Bogotá, 1970, 197 páginas. PEÑUELA, CAYO LEÓNIDAS: Álbum de Boyacá, 2 tomos, segunda edición, Tmi- Ja, 1969-1970, 764 -f- 535 páginas. Fotografías. WEST, ROBERT C: La minería de aluvión en ... ...

    Abstract MARGARITA GONZÁLEZ. El Resguardo en el Nuevo Reino de Granada. Bogotá, 1970, 197 páginas. PEÑUELA, CAYO LEÓNIDAS: Álbum de Boyacá, 2 tomos, segunda edición, Tmi- Ja, 1969-1970, 764 -f- 535 páginas. Fotografías. WEST, ROBERT C: La minería de aluvión en Colombia durante el período Colo- nial, Divulgación Cultural, Universidad Nacional de Colombia, Bogotá, 1972, 129 páginas, XVI B. Láminas. (Traducción de Jorge Orlando Meló y re- visión de Camilo Domínguez). URRUTIA, MIGUEL y ARRUBLA, MARIO (editores): Compendio de Estadísticas Históricas de Colombia, Dirección de Divulgación Cultural, Universidad Na- cional de Colombia, Bogotá, 1970, 314 páginas. MARTÍNEZ ZÜLAICA, ANTONIO: La Medicina del siglo XVIII en el Nuevo Reino de Granada, Universidad Pedagógica y Tecnológica de Colombia^ Tun- ja, 1972, 318 páginas. RUIZ RIVERA, JULIÁN: Fuentes para la Demografía Histórica de Nueva Gra- nada, Escuela de Estudios Hispanoamericanos, Sevilla, 1972, 157 páginas, 1 mapa. GILHODES, FIERRE: Las luchas agrarias en Colombia, Ed. El Tigre de Papel, Bogotá-Medellín, 1972, 90 páginas. (Traducción, Jorge Orlando Melo).
    Keywords GILHODES ; FIERRE ; RUIZ RIVERA ; JULIÁN ; MARTÍNEZ ZÜLAICA ; ANTONIO ; URRUTIA ; MIGUEL y ARRUBLA ; MARIO (editores) ; WEST ; ROBERT ; PEÑUELA ; CAYO LEÓNIDAS ; MARGARITA GONZÁLEZ ; History (General) ; D1-2009 ; History (General) and history of Europe ; D
    Language Spanish
    Publishing date 2012-08-01T00:00:00Z
    Publisher Universidad Nacional de Colombia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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