Properties of a-C:H films deposited from a methane electron cyclotron wave resonant plasma

N.A.Morrison,C.William,B.Racine,W.I.Milne,E.Martinez,J.Esteve,J.L.Andujar 한국물리학회 2003 Current Applied Physics Vol.3 No.5

An electron cyclotron wave resonant methane plasma discharge was used for the high rate deposition of hydrogenated amorphous carbon (a-C:H). Deposition rates of up to 400 AA/min were obtained over substrates up to 2.5 in. in diameter with a film thickness uniformity of 10%. The deposited films were characterised in terms of their mass density, sp3 and hydrogen contents, C–H bonding, intrinsic stress, scratch resistance and friction properties. The deposited films possessed an average sp3 content, mass density and refractive index of 58%, 1.76 g/cm3 and 2.035 respectively. Mechanical characterisation indicated that the films possessed very low steady-state coefficients of friction (ca. 0.06) and a moderate shear strength of 141 MPa. Nano-indentation measurements also indicated a hardness and elastic modulus of 16.1 and 160 GPa respectively. The critical loads required to induce coating failure were also observed to increase with ion energy as a consequence of the increase in degree of ion mixing at the interface. Furthermore, coating failure under scratch test conditions was observed to take place via fracture within the silicon substrate itself, rather than either in the coating or at the film/substrate interface. 2003 Elsevier B.V. All rights reserved.

Static wind loads on rigid roof model with complex hyperbolic geometry

Juan S. Delnero,Julio Marañón Di Leo,Mariano A. Martinez 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.3

The use of tensioned structures, such as membranes, as solutions for roofing and other kinds of covers has become more and more frequent. Current regulations do not provide detailed information about the coefficients needed to develop efficient designs, regarding wind loads. A lot of simulations and tests have been performed on different geometries which are typically used in these kinds of designs. However, no precise and clear standard has been established, yet, in order to regulate efficiently this application. Current regulations consider only simple geometries, while the effects of the interference between multiple covers or between a cover and the near urban environment is completely absent. In this paper are presented the results obtained from testing a 1:75 scale complex geometry model in a boundary layer wind tunnel. More precisely a model of a parking lot for vans, roofed with a complex geometry tensioned membrane was tested in order to measure its pressure distribution. Due to the high complexity of the geometry and in order to obtain a better description of the effects of the wind it was decided to lead wind tunnel tests to validate and to verify the load conditions over the roof. Information about wind load distributions for simple geometries such as cones, hyperboloids, etc. alone can be easily found in current technical bibliography. However, when designs are based on more complex shapes, including arrays of simpler shapes, a profound lack of information is observed. Therefore, it is not possible to calculate the wind loads over the membrane which are needed to dimension the supporting structure.

Finite and infinite dimensional Lie group structures on Riordan groups

Cheon, Gi-Sang,Luzó,n, Ana,Moró,n, Manuel A.,Prieto-Martinez, L. Felipe,Song, Minho Academic Press 2017 Advances in Mathematics Vol. No.

<P><B>Abstract</B></P> <P>We introduce a Frechet Lie group structure on the Riordan group. We give a description of the corresponding Lie algebra as a vector space of infinite lower triangular matrices. We describe a natural linear action induced on the Frechet space <SUP> K N </SUP> by any element in the Lie algebra. We relate this to a certain family of bivariate linear partial differential equations. We obtain the solutions of such equations using one-parameter groups in the Riordan group. We show how a particular semidirect product decomposition in the Riordan group is reflected in the Lie algebra. We study the stabilizer of a formal power series under the action induced by Riordan matrices. We get stabilizers in the fraction field K ( ( x ) ) using bi-infinite representations. We provide some examples. The main tool to get our results is the paper where the Riordan group was described using inverse sequences of groups of finite matrices.</P>

Safety of Nonoperative Management After Acute Diverticulitis

Javier Suarez Alecha,Sonia Amoza Pais,Xavi Batlle Marin,Begoña Oronoz Martinez,Enrique Balen Ribera,Concepción Yarnoz Irazabal 대한대장항문학회 2014 Annals of Coloproctolgy Vol.30 No.5

Purpose: The role of surgery in the management of diverticular disease after an episode of acute diverticulitis (AD) managed in a conservative form is evolving. Age, number of episodes of AD, type of episode, and symptoms after the episodes are factors related to the need for elective surgery. The aim of this study is to evaluate the safety of conservative management and the risk factors for emergency surgery after a first episode of AD managed without surgery. Methods: We retrospectively evaluated 405 patients diagnosed as having had a first episode of AD. Sixty-nine patients underwent emergency surgery on the first admission, and 69 patients had an elective operation in the follow-up (group A). The remaining 267 patients were managed initially without surgery (group B). Thirteen of these 267 patients needed a further urgent surgical procedure. Factors involved in the decision of elective surgery and the probability of emergency surgery after the first episode of AD managed without surgery were evaluated in relation to demographic factors, risk factors, presence of recurrences, and type of the first episode. Results: Patients, mean age was 62.7 years, 71 were aged less than 51, and 151 were males. The mean follow-up for patients with nonoperative management was 91.2 months. An elective operation was performed in 69 patients. Compared to patients in group B, those in group A more frequently had a first episode of complicated acute diverticulitis (CAD) (37.1% vs. 16.4%; P = 0.000) and were more likely to be smokers (46.3% vs. 19.3%; P = 0.000) and to suffer more than one episode of AD (42% vs. 26.9%; P = 0.027). Nonoperative management was chosen for 267 patients, but 13 patients needed an emergency operation later. In the multivariate analysis, we found a significant relation between the presence of CAD in the first episode and the need for emergency surgery. There were no differences in surgical mortality between the patients in the two groups, but patients treated with elective surgery had a higher rate of stoma than patients treated non-operatively (7.2% vs. 1.4%; P = 0.028); this difference was not observed in the subgroup of patients with CAD (15.3% vs. 6.8%; P = 0.458). Conclusion: After an episode of AD, nonoperative management is safe because fewer than 5% of patients will need an emergent procedure in a subsequent attack of AD. A first episode of CAD is the only risk factor for emergency surgery in patients managed conservatively.

Pectinmethylesterase Extraction from Jicama (Pachyrhizus erosus L. Urban)

N.A. Martinez,J.G. Rodriguez,C.N. Aguilar,J.C. Montanez,R.A. Hours,J.C. Contreras-Esquivel 한국식품과학회 2003 Food Science and Biotechnology Vol.12 No.2

Neutron Capture on <SUP>209</SUP>Bi: Determination of the Production Ratio of ^(210m)Bi/^(210g)Bi

F. Gunsing,E. Berthoumieux,A. Borella,T. Belgya,L. Szentmiklosi,P. Schillebeeckx,J. C. Drohe,R. Wynants,N. Colonna,S. Marrone,G. Tagliente,R. Terlizzi,C. Domingo-pardo,J. Tain,T. Martinez,C. Massimi,P 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

Neutron capture on ^(209)Bi produces either an isomeric state ^(210m)Bi with a half life of 3×10^6 years, or the ground state ^(210g)Bi which decays with a half life of 5 days to the alpha emitter ^(210)Po. Therefore the neutron capture cross section ratio ^(209)Bi(n,γ) ^(210m)^(Bi)/^(210g)Bi plays an important role in predicting the short- and long-term radio-toxicity produced by ^(209)Bi under neutron irradiation. This ratio is dependent on the neutron energy. We have measured this ratio for cold neutrons at the cold neutron beam facility of the Budapest Neutron Centre by observing the population of the ground- and the metastable state using high resolution gamma-ray spectroscopy. The same technique hasbeen used at the pulsed white neutron source GELINA of the IRMM, Geel in combination with the neutron time-of-flight technique. Results for the neutron-energy dependent branching ratio will be presented. In addition we performed simulations using a statistical decay code.

Design, setup and routine operation of a water treatment system for the monitoring of low activities of tritium in water

C.D.R. Azevedo,A. Baeza,E. Chauveau,J.A. Corbacho,J. Diaz,J. Domange,C. Marquet,M. Martinez-Roig,F. Piquemal,C. Roldan,J. Vasco,J.F.C.A. Veloso,N. Yahlali Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7

In the TRITIUM project, an on-site monitoring system is being developed to measure tritium (³H) levels in water near nuclear power plants. The quite low-energy betas emitted by ³H have a very short average path in water (5 ㎛ as shown by simulations for 18 keV electrons). This path would be further reduced by impurities present in the water, resulting in a significant reduction of the detection efficiency. Therefore, one of the essential requirements of the project is the elimination of these impurities through a filtration process and the removal of salts in solution. This paper describes a water treatment system developed for the project that meets the following requirements: the water produced should be of near-pure water quality according to ISO 3696 grade 3 standard (conductivity < 10 µS/cm); the system should operate autonomously and be remotely monitored.

Noncanonical role of singleminded-2s in mitochondrial respiratory chain formation in breast cancer

Wall Steven W.,Sanchez Lilia,Tuttle Kelly Scribner,Pearson Scott J.,Soma Shivatheja,Wyatt Garhett L.,Carter Hannah N.,Jenschke Ramsey M.,Tan Lin,Martinez Sara A.,Lorenzi Philip L.,Gohil Vishal M.,Rijn 생화학분자생물학회 2023 Experimental and molecular medicine Vol.55 No.-

Dysregulation of cellular metabolism is a hallmark of breast cancer progression and is associated with metastasis and therapeutic resistance. Here, we show that the breast tumor suppressor gene SIM2 promotes mitochondrial oxidative phosphorylation (OXPHOS) using breast cancer cell line models. Mechanistically, we found that SIM2s functions not as a transcription factor but localizes to mitochondria and directly interacts with the mitochondrial respiratory chain (MRC) to facilitate functional supercomplex (SC) formation. Loss of SIM2s expression disrupts SC formation through destabilization of MRC Complex III, leading to inhibition of electron transport, although Complex I (CI) activity is retained. A metabolomic analysis showed that knockout of SIM2s leads to a compensatory increase in ATP production through glycolysis and accelerated glutamine-driven TCA cycle production of NADH, creating a favorable environment for high cell proliferation. Our findings indicate that SIM2s is a novel stabilizing factor required for SC assembly, providing insight into the impact of the MRC on metabolic adaptation and breast cancer progression.

Remote Healthcare Program in Mexico in the Context of the COVID-19 Pandemic

Rodolfo Lehmann Mendoza,Gabriela Yanet Cortés Moreno,Hilario Ascensión Martinez Arredondo,Anaya Aguilar Cynthia Jeanet,Pedro Armando Chaidez Rosales,Ilicia González Mundo,Armando Mejía Nava,Adrian H. 대한의료정보학회 2022 Healthcare Informatics Research Vol.28 No.2

Objectives: Given the challenge of limiting the transmission of coronavirus disease 2019 while simultaneously continuingto provide medical care for other chronic and degenerative diseases and monitor therapy, a remote medical advice and guidanceprogram was created to help individuals receive health services at their homes. Methods: A descriptive, cross-sectional,and observational study was performed from April 13, 2020 to April 19, 2021 among Petroleos Mexicanos (PEMEX) healthservices beneficiaries. Mobile text messages were used to assign patients throughout Mexico to a doctor, who coordinateda video call with the nursing service for advice and remote care. Results: In total, 17,472 calls were registered, with an averageduration of 10.28 minutes. Almost half (49.4%) of the people who requested attention through the remote program wereworkers, 31.5% were workers’ relatives, and 19.1% were retired workers. The average age of the program users was 50.66 ±18.02 years. A total of 144 doctors from 28 different specialties participated. In this program, 7,163 calls were made becauseof respiratory symptoms, 1,514 for therapeutic monitoring (prescriptions), and 8,183 because of other diseases, includingmental health. Conclusions: Remote healthcare programs have shown the potential to support the health system. This programis the first to deploy real-time video calls with a health team utilizing institutional electronic clinical records in Mexico. The implementation of this pandemic management program impacted the number of consultations given remotely, resultingin effective triage.

The "Warm Zone" Cases: Environmental Monitoring Immediately Outside the Fire Incident Response Arena by Firefighters

Caban-Martinez, Alberto J.,Kropa, Bob,Niemczyk, Neal,Moore, Kevin J.,Baum, Jeramy,Solle, Natasha Schaefer,Sterling, David A.,Kobetz, Erin N. Occupational Safety and Health Research Institute 2018 Safety and health at work Vol.9 No.3

Hazardous work zones (i.e., hot, warm, and cold) are typically established by emergency response teams during hazardous materials (HAZMAT) calls but less consistently for fire responses to segment personnel and response activities in the immediate geographic area around the fire. Despite national guidelines, studies have documented the inconsistent use of respiratory protective equipment by firefighters at the fire scene. In this case-series report, we describe warm zone gas levels using multigas detectors across five independent fire incident responses all occurring in a large South Florida fire department. Multigas detector data collected at each fire response indicate the presence of sustained levels of volatile organic compounds in the "warm zone" of each fire event. These cases suggest that firefighters should not only implement strategies for multigas detector use within the warm zone but also include respiratory protection to provide adequate safety from toxic exposures in the warm zone.