bluuebunny/crossref_metadata_2025_split huggingface dataset:
Análisis de concretos con no conformidades: efectos de larga duración
Authors: Fernandes B. , Christ R. , Quinino U. , Tutikian B. 
Published: September 2016

Análisis de concretos con no conformidades: efectos de larga duración RESUMENEste artículo tiene como objetivo contribuir al análisis del concreto en casos de incumplimiento normativo, centrado en los efectos a largo plazo. Se llevó a cabo una encuesta entre los participantes en el análisis de no conformidades: evolución de la resistencia a la compresión, variabilidad de los resultados y criterios de aceptación. Complementariamente, se presenta un caso de estudio de un hormigón en incumplimiento utilizado en una estructura mixta (pilares metálicos rellenos) que mostró una resistencia a 28 días menor que la especificada. Teniendo en cuenta los efectos a largo plazo, se observó una ganancia de resistencia nominal por encima de los límites reglamentarios. Este análisis, junto con una revisión del proyecto y una inspección minuciosa puede ayudar en la toma de decisiones en casos de hormigón en incumplimiento.Palabras clave: incumplimiento; ganancia de resistencia; seguridad estructural. Analysis of non-conformity concrete: long time effectsABSTRACTThe paper aims to contribute to the analysis of non-conformity concrete, focusing on long time effects. A review of compressive strength evolution, results variability and acceptance criteria was made. In addition, it is presented a case study of a nonconforming concrete used in composite structures (concrete-filled steel columns) that present 28-day strength below the specified. Considering long time effects, a nominal strength gain above the limits considered in technical standards was observed. This analysis, associated with a revision of the structural design and a carefully assessment, could help decision taking in case of non-conformity concretes.Keywords: non-conforming; strength gain; structural safety. Análise de concretos com não conformidades: efeitos de longa duração RESUMOO presente artigo tem como objetivo contribuir para a análise de concretos com não conformidades, com foco nos efeitos de longa duração. Foi realizado um levantamento dos intervenientes na análise de não conformidades: evolução da resistência à compressão, a variabilidade dos resultados e critérios de aceitação do concreto. De forma complementar, é apresentado o estudo de caso de concretos não conformes empregados em estrutura mista (pilares metálicos preenchidos) que apresentaram resistências abaixo do especificado aos 28 dias. Considerando os efeitos de longa duração, um ganho de resistência nominal acima dos limites normativos foi observado. Esta análise, aliada a uma revisão do projeto e a uma inspeção criteriosa, pode auxiliar na tomada de decisão em casos de concretos não conformes.Palavras-chave: não conformidade; crescimento de resistência; segurança estrutural.
Impacts of an Enhanced Family Health and Sexuality Module of the HealthTeacher Middle School Curriculum: A Cluster Randomized Trial
Authors: Goesling Brian , Scott Mindy E. , Cook Elizabeth 
Published: September 2016

Objectives. To evaluate the impacts of an enhanced version of the Family Life and Sexuality Module of the HealthTeacher middle school curriculum. Methods. We conducted a cluster randomized trial of Chicago, Illinois, middle schools. We randomly assigned schools to a treatment group that received the intervention during the 2010–2011 school year or a control group that did not. The primary analysis sample included 595 students (7 schools) in the treatment group and 594 students (7 schools) in the control group. Results. Students in the treatment schools reported greater exposure to information on reproductive health topics such as sexually transmitted infections (STIs; 78% vs 60%; P < .01), abstinence (64% vs 37%; P < .01), and birth control (45% vs 29%; P < .01). They also reported higher average scores on an index of knowledge of contraceptive methods and STI transmission (0.5 vs 0.3; P = .02). We found no statistically significant differences in rates of sexual intercourse (12% vs 12%; P = .99), oral sex (12% vs 9%; P = .18), or other intermediate outcomes. Conclusions. The program had modest effects when tested among Chicago middle school students.
Impact of Two Adolescent Pregnancy Prevention Interventions on Risky Sexual Behavior: A Three-Arm Cluster Randomized Control Trial
Authors: Barbee Anita P. , Cunningham Michael R. , van Zyl Michiel A. , Antle Becky F. , Langley Cheri N. 
Published: September 2016

Objectives. To test the efficacy of Reducing the Risk (RTR) and Love Notes (LN) on reducing risky sexual behavior among youths yet to experience or cause a pregnancy. Methods. The four dependent variables were ever had sex, condom use, birth control use, and number of sexual partners at 3- and 6-month follow-up in a 3-arm cluster randomized controlled trial of 1448 impoverished youths, aged 14 to 19 years, in 23 community-based organizations in Louisville, Kentucky, from September 2011 through March 2014. Results. At 3 and 6 months, compared with the control condition, youths in RTR reported fewer sexual partners and greater use of birth control. At 6 months, LN participants reported greater use of birth control and condoms, fewer sexual partners, and were less likely to have ever had sex compared with the control condition. Conclusions. We provided additional evidence for the continued efficacy of RTR and the first rigorous study of LN, which embeds sex education into a larger curriculum on healthy relationships and violence prevention.
Compositional Mechanisms in Steam-Assisted Gravity Drainage and Expanding-Solvent Steam-Assisted Gravity Drainage With Consideration of Water Solubility in Oil
Authors: Venkatramani Arun Venkat , Okuno Ryosuke 
Published: September 2016

Summary
Experimental data have shown that the solubility of water in the oleic (L) phase (xwL) can be significant at elevated temperatures. However, xwL was not properly considered in prior studies of steam-assisted gravity drainage (SAGD) and expanding-solvent (ES)-SAGD. The main objective of this research is to present a detailed study of compositional mechanisms in SAGD and ES-SAGD simulation by considering xwL.
The phase-behavior models used in this research are carefully created on the basis of experimental studies presented in the literature. Mechanistic simulation studies are then conducted for SAGD and ES-SAGD. Coinjectants used in ES-SAGD simulations range from propane through n-decane.
Results show that xwL enhances bitumen production in both SAGD and ES-SAGD, mainly because xwL results in reduction of L-phase viscosity. The enhancement is more significant when the chamber-edge temperature is higher, because xwL increases with temperature. The enhancement of bitumen production observed in the case studies is 7.66% for SAGD, 4.08% for n-C6-SAGD, and 4.85% for n-C8-SAGD for a fixed period of operation at 35 bar. It is important to consider xwL in SAGD and ES-SAGD simulations, because the performance of ES-SAGD relative to SAGD tends to be overestimated without considering xwL.
A guideline is presented to leverage xwL to improve bitumen production in ES-SAGD. As discussed in our prior research, solvent becomes effective in diluting bitumen and reducing the steam requirement only when it sufficiently accumulates near the chamber edge. New results show that water can act as a diluting agent until solvent sufficiently accumulates near the chamber edge.
Numerical computation of wheel-rail impact noises with considering wheel flats based on the boundary element method
Authors: Cui Kai , Qin Xiaotong 
Published: September 2016

When a wheel rolls to a flat, it can generate the impact force several multiples larger than that generated at the common time. The paper established a wheel-rail coupling vibration model with wheel flat, and vibration acceleration responses of the rail was computed. The computational result was then compared with the experimental result. Good consistency between simulation and experiment indicated that the finite element model is reliable. Then, based on the finite element model and boundary element model, the paper established a structural-acoustic coupling boundary element model and computed the radiation noise of wheel-rail under effects of wheel flats. Results show that: the wheel flats were an important reason for wheel rail impact noises, impact noises of wheel flats were mainly concentrated in frequency bands of over 250 Hz, and impact noises of wheel flats were closely related with wheel flat length, quantity of wheel flats as well as running speeds. With the increase of these parameters, the radiation noise of wheel flats would be increased correspondingly.
A rolling bearing fault diagnosis method based on VMD – multiscale fractal dimension/energy and optimized support vector machine
Authors: Chen Fei , Chen Xiaojuan , Yang Zhaojun , Xu Binbin , Xie Qunya , Zhang Heng , Ye Yifeng 
Published: September 2016

To achieve the goal of automated rolling bearing fault diagnosis, a variational mode decomposition (VMD) based diagnosis scheme was proposed. VMD was firstly used to decompose the vibration signals into a series of band-limited intrinsic mode functions (BLIMFs). Subsequently, the multiscale fractal dimension (MSFD) and multiscale energy (MSEN) of each BLIMF were calculated and combined together as features of the original vibration signals. In an attempt to accelerate the classification speed, one-way analysis of variance (ANOVA) test was adopted to extract significant features from the redundant features. Finally, those significant features were fed into the optimized support vector machine (SVM), which was optimized by the genetic algorithm (GA), for classification. Experimental results on the international public Case Western Reserve University bearing data indicate the effectiveness of the proposed method with a classification accuracy of 99.75 % for seven classes. Moreover, our approach also shows good anti-noise performance in different signal-to-noise ratios (SNRs).
Experimental investigation of the vibration-attenuating effect of rail suspension fasteners on environment vibration induced by subway
Authors: Wang Ping , Wei Kai , Liang Yingchun , Wang Feng 
Published: September 2016

A field test of environment vibration due to subway was carried out so as to investigate the vibration-alleviating effect of rail suspension fasteners in both time and frequency domains. The experimental results show that the time-domain vertical ground vibration accelerations would transform from several concentrated vibrations to the decentralized and uniform ones after replacement of common rail fasteners with rail suspension fasteners. Moreover, rail suspension fasteners have more significant vibration-mitigation effect on the time-domain peak particle accelerations (PPAs) at the nearer positions than at the farther ones, and the minimum PPA induced by common rail fasteners is still higher than the maximal PPA caused by rail suspension fasteners at all measuring positions. In frequency domain, the vibration-reduction effect of rail suspension fasteners is more remarkable in the dominant 1/3 octave center frequencies of 50-125 Hz than in the non-dominant ones from 1 to 40 Hz. Compared with common rail fasteners, the highest vibration acceleration levels (VALmax) in the dominant 1/3 octave center frequencies between 50 and 125 Hz at all measuring positions decrease by 8.7-21 dB after adoption of rail suspension fasteners. Additionally, the integrated VLzs in 1/3 octave center frequencies of 1-125 Hz at all measuring positions are ranged from 77.1 dB to 66.5 dB, evidently higher than the China’ standard threshold of 65 dB, before replacement of common rail fasteners, while the integrated VLzs are framed between 68.3 and 57.3 dB, mostly less than the threshold, after application of rail suspension fasteners.
Instituições de ensino superior e desenvolvimento: impactos econômicos de curto prazo de universidades federais do oeste paranaense
Authors: Brüne Sabrina , Bidarra Zelimar Soares 
Published: September 2016

O objetivo deste artigo é o de analisar os impactos diretos (no curto prazo) gerados pela Universidade Federal do Paraná, localizada em Palotina, e pela Universidade Tecnológica Federal do Paraná, de Toledo, que aderiram ao Programa de Apoio a Planos de Reestruturação e Expansão das Universidades Federais (Reuni) nas cidades que as hospedam e a influência desses impactos na economia local. A opção por trabalhar com os efeitos econômicos do Reuni se deu pelo fato de o tema ter sido pouco explorado em pesquisas acadêmicas até então. Parte-se do pressuposto de que as universidades são instituições com relevância econômica para os municípios e, portanto, contribuem ativamente para o desenvolvimento local. A metodologia utilizada é um estudo de caso comparativo entre as duas IES, e o principal instrumento de coleta de dados foi o questionário. Espera-se demonstrar que as universidades são organizações dinamizadoras da economia local.
The Use of Antihypoxant and Antioxidant Therapy in Comprehensive Treatment of Acute Small Intestinal Obstruction
Authors: Skrypko V. D. , Deltsova O. I. , Klymenko A. O. , Gonchar M. H. , Sheviak P. I. 
Published: September 2016

Indices of lipid peroxidation (LPO), middle weight molecules (MWM), and changes in the structure of the liver and the impact of Reamberin solution on them were analyzed in 202 patients with acute small intestinal obstruction (ASIO) and model of small intestinal obstruction (SIO) in 40 Vietnamese pigs. Endogenous intoxication indices were established to increase along with the increase in enteral deficiency. In case of ASIO increase in lipid peroxidation products, MWM in serum, and decrease in ceruloplasmin securities, significant changes in the liver (destruction of granular and smooth endoplasmic reticulum, mitochondria, hepatocytes nuclei) were observed. Surgical resolution of ASIO leads to further temporary deterioration of liver structure, increase in MWM, and indices of lipid peroxidation and decrease in ceruloplasmin levels. Prescription of antioxidant therapy in the postoperative period promotes reparative processes in hepatocytes and leads to normalization of endogenous intoxication indices in blood serum and helps reduce postoperative mortality.
Microleakage of Lithium Disilicate Crown Margins Finished on Direct Restorative Materials
Authors: Metz M , Durski M , Chou J , Crim G , Harris B , Lin W-S 
Published: September 2016

SUMMARY
Objective: For some esthetic clinical situations, it is necessary to finish crown margins on direct restorative materials to preserve tissue integrity, bonding integrity, and biological width. The purpose of this research was to investigate microleakage at the interface between bonded lithium disilicate crowns and various direct restorative materials in a class III and class V position.
Methods and Materials: Class III or class V restorations were prepared on one side of extracted incisors with either Tetric EvoCeram, Tetric Evoceram Bulk, Fuji II LC, or Tetric Evoflow. The teeth were prepared for and received a lithium disilicate crown. After load fatiguing, the specimens were thermo-cycled with a fuchsin dye and sectioned. The depth and area of dye penetration were measured with a dimensional grid in micrometers using stereomicroscopy and reported as mean dye depth and area (μm) ± SD. The comparison of multiple categorical independent variables with ratio scale dependent variables was evaluated with an analysis of variance and Tukey's post hoc analysis.
Results: A statistically significant higher dye penetration was noted for all treatment groups compared with the positive control (side opposite the restoration after sagittal sectioning was used as positive control) regardless of material or placement area (p&lt;0.05). In comparing treatment groups, the Tetric EvoFlow experienced a statistically higher dye penetration than did the other treatment groups regardless of material or placement area (p&lt;0.05). There was no statistically significant difference between the Tetric EvoCeram, Tetric Evoceram Bulk, and Fuji II LC materials regardless of placement area (p&gt;0.05).
Conclusions: Within the limitations of this study, it can be concluded that flowable composite materials as finish lines that interact with resin cements could lead to exacerbated interfacial degradation. Finishing lithium disilicate all-ceramic crowns on flowable resin composite materials in the esthetic zone should be used with caution. If necessary, finishing lithium disilicate all-ceramic crowns on nanofilled resin composite or resin-modified glass ionomer materials seems to provide the least dye penetration depth and area.
Microtensile Bond Strength of Composite Cement to Novel CAD/CAM Materials as a Function of Surface Treatment and Aging
Authors: Lise DP , Van Ende A , De Munck J , Vieira LCC , Baratieri LN , Van Meerbeek B 
Published: September 2016

SUMMARY
Objectives: To evaluate the effect of different surface treatments on the bond strength to a composite and a polymer-infiltrated ceramic CAD/CAM block after six-month artificial aging.
Methods and Materials: Two types of CAD/CAM blocks (Cerasmart, GC; Enamic, Vita Zahnfabrik) were cut in slabs of 4-mm thickness, divided into six groups, and subjected to the following surface treatments: group 1: no treatment; group 2: sandblasting (SB); group 3: SB + silane (Si); group 4: SB + Si + flowable composite (see below); group 5: 5% hydrofluoric acid etching (HF) + Si; and group 6: 37% phosphoric acid etching (H3PO4) + Si. Sections of the same group were luted together (n=3: 3 sandwich specimens/group) using a dual-cure self-adhesive cement for all groups, except for the sections of group 4 that were luted using a light-curing flowable composite. After three weeks of storage in 0.5% chloramine at 37°C, the sandwich specimens were sectioned in rectangular microspecimens and trimmed at the interface to a dumbbell shape (1.1-mm diameter). One half of the specimens was subjected to a microtensile bond strength (μTBS) test, and the other half was tested after six months of water storage (aging). Data were statistically analyzed with a linear mixed-effects model for the factors surface treatment, material type, and aging, together with their first-degree interactions (α=0.05).
Results: The lowest bond strengths were obtained in the absence of any surface treatment (group 1), while the highest μTBSs were obtained when the surface was roughened by either SB or HF, this in combination with chemical adhesion through Si. Loss in bond strength was observed after six-month aging when either surface roughening or silanization, or both, were omitted.
Conclusions: Both the composite and polymer-infiltrated ceramic CAD/CAM blocks appeared equally bonding-receptive regardless of the surface treatment used. Creating a microretentive surface by either SB or HF, followed by chemical adhesion using Si, is mandatory to maintain the bond strength after six months.
Effect of Nd:YAG Laser Irradiation Pretreatment on the Long-Term Bond Strength of Etch-and-Rinse Adhesive to Dentin
Authors: Gan J , Liu S , Zhou L , Wang Y , Guo J , Huang C 
Published: September 2016

SUMMARY
Purpose: To investigate the effect of neodymium-doped yttrium aluminum garnet (Nd:YAG) laser irradiation pretreatment on the long-term bond strength of an etch-and-rinse adhesive to dentin.
Methods: Fifty molars were sectioned parallel to the occlusal plane and randomly divided into two groups (n=25 per group): control group (no treatment) and laser group (dentin surfaces were treated with Nd:YAG laser at a setting of 100 mJ/10 Hz). Afterward, resin was bonded to the dentin surface using a two-step etch-and-rinse adhesive (Adper SingleBond 2), and then 150 beams of each group were produced. Each group was divided into three subgroups (n=50 each group): 24 hours of water storage, thermocycling, and NaOCl storage. The microtensile bond strength (MTBS), failure modes, nanoleakage expression, and Masson's trichrome staining were evaluated. An additional 20 molars were sectioned to obtain 2-mm-thick flat dentin slices. These slices were randomly divided into control and laser-treated groups as mentioned previously. Then slices of each group were examined by scanning electron microscopy, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), and the Knoop hardness test.
Results: The results of ATR-FTIR and Masson's trichrome verified that laser irradiation partly removed collagen fibers from the dentin surface; however, no significant difference was found in the Knoop hardness (p&gt;0.05). The XRD result showed similar crystalline structure regardless of laser pretreatment. There is no significant difference in short-term MTBS between control and laser-treated groups (p&gt;0.05); however, long-term MTBS differed between the groups (p&gt;0.05). Furthermore, the laser-treated group showed less silver deposition than the control group after aging (p&lt;0.05).
Conclusion: Pretreatment by Nd:YAG laser irradiation appeared to have a positive effect on the adhesive-dentin bonding in vitro test, and the bonding effectiveness could be preserved after aging.
Rapid Diagnosis of Bacterial Pneumonia in Under-five Children by Latex Particle Agglutination Test in Urine
Authors: Begum Shahin Ara , Rashid Aliya , Rhman Md. Abdur , Chowdhury Akhtaruzzman , Rahman Sufi HZ , Muazzam Naima 
Published: September 2016

Streptococcus pneumoniae and Haemophilus influenzae type b are the main causes of community-acquired bacterial pneumonia in developing countries including Bangladesh. This study was carried out to find a rapid diagnostic method for early detection of bacterial pneumonia. Latex Particle Agglutination Test (LPAT) was done in urine for quick detection of capsular antigens of S. pneumoniae and H. influenzae type b. Three hundred children were enrolled based on clinical criteria as defined by the WHO. Among them, 70 pneumonic children, who had total white blood cell counts around 20000/ mm3, Neutrophils ? 75% and consolidation on chest X-rays, were selected for LPAT in urine. Some 20 children of the same age group, who had chest diseases other than pneumonia, were selected as sick control group. Among 70 pneumonic cases, 36 (51.43%) were positive by LPAT in urine. Out of 36 LPAT-positive cases, 19 (52.7%) were positive for S. pneumoniae and 17 (47.3%) were positive for H. influenzae type b by specific anti-sera. The LPAT is thus appears as a quick and reliable test for the diagnosis of bacterial pneumonia cases caused by S. pneumoniae and H. influenzae type b.Bangladesh J Med Microbiol 2007; 01 (01):17-20
Anti-Helicobacter pylori IgG in Asymptomatic Population
Authors: Sumona Asma Azad , Hossain Md. Akram , Shamsuzzaman AKM , Musa AKM , Mahmud Md. Chand , Ali Md. Shawkat , Khan Mohammad Shoeb , Ahmed Salma , Begum Zohra , Zahan Nahida Akther , Ahmed Mejbah Uddin 
Published: September 2016

To evaluate the serologic (IgG) response to Helicobacter pylori in asymptomatic population, a total of 45 asymptomatic healthy adults aged 18-65 years were included in the study. The study was carried out in the department of Microbiology, Mymensingh Medical College between July, 2006 to June, 2007. The sera samples of the participants were tested for presence of anti-H. pylori IgG by using Enzyme Linked Immunosorbent Assay (ELISA). Seropositivity rate for anti-H. pylori IgG in asymptomatic adults was found 88.89% at a cut-off level of 5 arbU/ml. The impact of changing cut-off level for IgG seropositivity was also examined in the present study. The seropositivity rate for anti-H. pylori IgG at 10 arbU/ml was found 71.11%.Bangladesh J Med Microbiol 2008; 02 (02): 31-34