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Ríos-Osorio Néstor,Quijano-Guauque Sara,Briñez-Rodríguez Sandra,Velasco-Flechas Gustavo,Muñoz-Solís Antonieta,Chávez Carlos,Fernandez-Grisales Rafael 대한치과보존학회 2024 Restorative Dentistry & Endodontics Vol.49 No.1
The implementation of imaging methods that enable sensitive and specific observation of anatomical structures has been a constant in the evolution of endodontic therapy. Cone-beam computed tomography (CBCT) enables 3-dimensional (3D) spatial anatomical navigation in the 3 volumetric planes (sagittal, coronal and axial) which translates into great accuracy for the identification of endodontic pathologies/conditions. CBCT interpretation consists of 2 main components: (i) the generation of specific tasks of the image and (ii) the subsequent interpretation report. A systematic and reproducible method to review CBCT scans can improve the accuracy of the interpretation process, translating into greater precision in terms of diagnosis and planning of endodontic clinical procedures. MEDLINE (PubMed), Web of Science, Google Scholar, Embase and Scopus were searched from inception to March 2023. This narrative review addresses the theoretical concepts, elements of interpretation and applications of the CBCT scan in endodontics. In addition, the contents and rationale for reporting 3D endodontic imaging are discussed.
Armando Saenz,Victor Santibañez,Eusebio Bugarin,Alejandro Dzul,Héctor Ríos,Jorge Villalobos-Chin 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.2
In this paper, we propose a novel computed voltage based control law for an omnidirectional wheeled mobile robot equipped with four mecanum wheels. First, the dynamical model for the mechanical part is originally introduced by means of the Euler-Lagrange formulation. The motion constraints are added to the dynamic model using the Lagrange multipliers. Then, the dynamic model is completed by incorporating the dynamics of the actuators. Therefore, the dynamical model input signals are the armature voltage of the motors. The control law requires only the feedback of position and velocity of the whole robot, unlike most controllers in the literature that also need wheel speed feedback. The position and velocity are obtained by means of a multicam vision system, so measurements from motor encoders are not needed. A high-order sliding modes differentiator is included to estimate linear and angular velocities in a finite time. A stability proof is presented by means of the direct Lyapunov method, and furthermore, an analysis about parametric uncertainties in the mechanical parameters is introduced. The experimental results validate the theoretical proposal and show the good performance of the approach.
M. J. Pellegrini-Cervantes,C. P. Barrios-Durstewitz,R. E. Nú,ñ,ez-Jaquez,F. J. Baldenebro-Lopez,R. Corral-Higuera,S. P. Arredondo-Rea,M. Rodriguez-Rodriguez,O. Llanes-Cardenas,R. Beltran-Chaco 한국탄소학회 2018 Carbon Letters Vol.26 No.-
Pollution of chloride ion-reinforced concrete can trigger active corrosion processes that reduce the useful life of structures. Multifunctional materials used as a counter-electrode by electrochemical techniques have been used to rehabilitate contaminated concrete. Cement-based pastes added to carbonaceous material, fibers or dust, have been used as an anode in the non-destructive Electrochemical Chloride Extraction (ECE) technique. We studied the performance of the addition of Carbon Fiber (CF) in a cement-graphite powder base paste used as an anode in ECE of concretes contaminated with chlorides from the preparation of the mixture. The experimental parameters were: 2.3% of free chlorides, 21 days of ECE application, a Carbon Fiber Volume Fraction (CFVF) of 0.1, 0.3, 0.6, 0.9%, a lithium borate alkaline electrolyte, a current density of 4.0 A / m2 and a cement/graphite ratio of 1.0 for the paste. The efficiency of the ECE in the traditional technique using metal mesh as an anode was 77.6% and for CFVF of 0.9% it was 90.4%, with a tendency to increase to higher percentages of the CFVF in the conductive cement-graphite paste, keeping the pH stable and achieving a homogeneous ECE in the mass of the concrete contaminated with chlorides.
Bursectomy, Curettage, and Chemotherapy in Tuberculous Trochanteric Bursitis
Luis R. Ramos-Pascua,José A. Carro-Fernández,José A. Santos-Sánchez,Paula Casas Ramos,Luis J. Díez-Romero,Francisco M. Izquierdo-García 대한정형외과학회 2016 Clinics in Orthopedic Surgery Vol.8 No.1
We presented three patients with trochanteric tuberculosis and described the clinical and imaging findings of the infection. Histology revealed a necrotizing granulomatous bursitis and microbiology confirmed tuberculosis. All cases were successfully treated with bursectomy and curettage of the trochanteric lesion and antituberculous chemotherapy including isoniazid, pyrazinamide, rifampicin, and ethambutol.
Agri Agra Law Compliance among Philippine Banks: Trends and Insights
Cherry Lou R,Nuñ,ez,Arnie-Gil DLR,Hordejan,Jeanette Angeline B,Madamba 아시아무역학회 2020 Journal of Asia Trade and Business Vol.7 No.1
Purpose - This study examined the trends of compliance by the Philippine banking sector and offered insights and suggestions based on the findings. Being an agricultural country, the agricultural (agri) and agrarian (agra) sector of the Philippines is constantly in need of funds from the banking and financial sector in order to meet operational requirements if it is to develop and grow. However, since most farmers and farming enterprises are not bankable due to strict banking standards and requirements including collateral, lack of financing remains a chronic challenge. Thus, a mechanism formulated by the Philippine government together with the Bangko Sentral ng Pilipinas (BSP) also known as the Central Bank of the Philippines, included an Agri-Agra Law requiring all banks within its jurisdiction to channel one-fourth of their net loanable funds to agriculture to spur development and economic growth in the countryside. Design/Methodology/Approach - To accomplish the research objectives, this study utilized descriptive and trend analyses. Findings - Results showed that while there appeared to be compliance relative to the Agri requirement of the law, banks as a whole remained non-compliant in terms of the Agra requirement of the law such that instead of direct lending to agribusinesses and agrarian reform beneficiaries, banks preferred to comply via alternative modes of compliance. Research Implications - This implies that banks still consider farmers, agricultural and agro-based enterprises and agrarian beneficiaries as lending risks and minimally profitable to do business with. It is suggested therefore that changes be introduced in the implementing rules and regulations of the Agri-Agra Law to address the risk issues and make it more financially rewarding for banks to lend to the agricultural and agrarian sector through the introduction of incentives.
Periá,ñ,ez, R.,Bezhenar, R.,Brovchenko, I.,Jung, K.T.,Kamidara, Y.,Kim, K.O.,Kobayashi, T.,Liptak, L.,Maderich, V.,Min, B.I.,Suh, K.S. Elsevier Applied Science Publishers 2019 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.198 No.-
<P><B>Abstract</B></P> <P>A number of marine radionuclide dispersion models (both Eulerian and Lagrangian) were applied to simulate <SUP>137</SUP>Cs releases from Fukushima Daiichi nuclear power plant accident in 2011 over the Pacific at oceanic scale. Simulations extended over two years and both direct releases into the ocean and deposition of atmospheric releases on the ocean surface were considered. Dispersion models included an embedded biological uptake model (BUM). Three types of BUMs were used: equilibrium, dynamic and allometric. Model results were compared with <SUP>137</SUP>Cs measurements in water (surface, intermediate and deep layers), sediment and biota (zooplankton, non-piscivorous and piscivorous fish). A reasonable agreement in model/model and model/data comparisons was obtained.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Marine dispersion models applied to Fukushima releases in the Pacific Ocean. </LI> <LI> Biological uptake model included within physical dispersion models. </LI> <LI> Model results compared with measurements in water, sediments and biota. </LI> <LI> Generally good agreement in model/model and model/data comparisons. </LI> </UL> </P>
The marine <i>kd</i> and water/sediment interaction problem
Periá,ñ,ez, R.,Brovchenko, I.,Jung, K.T.,Kim, K.O.,Maderich, V. Elsevier 2018 JOURNAL OF ENVIRONMENTAL RADIOACTIVITY Vol.192 No.-
<P><B>Abstract</B></P> <P>The behavior of marine distribution coefficients is analyzed with the help of numerical experiments and analytical solutions of equations describing kinetic models for uptake/release of radionuclides. The difficulties in measuring true k<SUB>d</SUB> in a marine environment perturbed by an external radionuclide source are highlighted. Differences between suspended matter and bed sediment k<SUB>d</SUB> are analyzed. The performances of different kinetic models (1-step/2step; single-layer/multi-layer) are studied in model/model and model/experiment comparisons. Implications for the use of models to assess radioactive contamination after an emergency are given; as well as recommendations when k<SUB>d</SUB> data are compiled in order to create a useful database.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Equilibrium in radionuclide partition between water and sediment seldom found in the sea. </LI> <LI> Differences between suspended matter and bed sediment kd highlighted. </LI> <LI> One step and two step kinetic models performances compared. </LI> <LI> Single layer and multi-layer models compared. </LI> <LI> Formulation to deal with changes in salinity and pH provided. </LI> </UL> </P>
Periá,ñ,ez, R.,Suh, Kyung-Suk,Min, Byung-Il Elsevier 2016 MARINE POLLUTION BULLETIN Vol.113 No.1
<P><B>Abstract</B></P> <P>A Lagrangian model which simulates the dispersion of <SUP>137</SUP>Cs in the North Atlantic has been developed. The model includes water/sediment interactions. It has been tested comparing calculated and measured <SUP>137</SUP>Cs concentrations in water and sediments of the European Shelf resulting after the releases from the nuclear fuel reprocessing plants of Sellafield and La Hague. Some additional numerical experiments have been carried out. First, the redissolution of <SUP>137</SUP>Cs from contaminated sediments after the reduction in releases from the reprocessing plants has been studied. This allowed to calculate effective half-lives of <SUP>137</SUP>Cs in several sub-basins. Later, potential leakage of <SUP>137</SUP>Cs from dumped nuclear wastes in several locations of the Atlantic has been investigated. Even in worst-case scenarios, these leakages should not lead to any radiological implications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Model applied to simulate <SUP>137</SUP>Cs marine dispersion in the North Atlantic </LI> <LI> Calculated Cs concentrations in water and sediments compared with measurements. </LI> <LI> Cs redissolution from contaminated sediments and subsequent transport studied </LI> <LI> Leakage from dumped nuclear waste should not have radiological implications. </LI> </UL> </P>
Periá,ñ,ez, R.,Suh, Kyung-Suk,Min, Byung-Il,Villa-Alfageme, M. Elsevier 2018 The Science of the total environment Vol.626 No.-
<P><B>Abstract</B></P> <P>A numerical model, previously validated with other radionuclides, was applied to simulate the dispersion of <SUP>236</SUP>U released from European nuclear fuel reprocessing plants in the North Atlantic and Shelf Seas using a published reconstruction of Sellafield and La Hague releases. Model results are in better agreement with observations if the lowest estimation of such releases are used. This implies that approximately 40kg of <SUP>236</SUP>U has been discharged from Sellafield. It was found that adsorption of <SUP>236</SUP>U on bed sediments of the shallow European Shelf Seas plays an essential role in its dispersion patterns. This contrasts strongly with the more conservative behaviour of <SUP>129</SUP>I in the same area. This has two important implications in the use of <SUP>236</SUP>U as oceanographic tracer; i) special care must be taken in coastal areas, as sediments might act as sinks and sources of <SUP>236</SUP>U; ii) the annual input function of <SUP>236</SUP>U into the Arctic is not directly controlled by the annual discharges from Sellafield and La Hague, since sediments from the Irish, Celtic and North Sea modulate and smooth the signal. Only 52% of the total releases enter into the Arctic Ocean.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Calculated <SUP>236</SUP>U concentrations in water and sediments compared with measurements. </LI> <LI> Adsorption of <SUP>236</SUP>U in bed sediments is significant. </LI> <LI> Releases from Sellafield estimated as 40kg of <SUP>236</SUP>U for period 1952–2013 </LI> <LI> Only 52% of the total releases from the three nuclear facilities are introduced into the Arctic. </LI> <LI> Input function into the Arctic reconstructed: total of 38 ± 8kg of <SUP>236</SUP>U for period 1952–2013. </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>