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Search Results: 1 - 10 of 2059 matches for " Nadine Tung "
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A free-boundary problem for the evolution $p$-Laplacian equation with a combustion boundary condition
Tung To
Mathematics , 2007,
Abstract: We study the existence, uniqueness and regularity of solutions of the equation $f_t = \Delta_p f = \text{div} (|Df|^{p-2} Df)$ under over-determined boundary conditions $f = 0$ and $|Df| = 1$. We show that if the initial data is concave and Lipschitz with a bounded and convex support, then the problem admits a unique solution which exists until it vanishes identically. Furthermore, the free-boundary of the support of $f$ is smooth for all positive time.
Loss of BRCA1 leads to an increase in epidermal growth factor receptor expression in mammary epithelial cells, and epidermal growth factor receptor inhibition prevents estrogen receptor-negative cancers in BRCA1-mutant mice
Laura N Burga, Hai Hu, Ashish Juvekar, Nadine M Tung, Susan L Troyan, Erin W Hofstatter, Gerburg M Wulf
Breast Cancer Research , 2011, DOI: 10.1186/bcr2850
Abstract: Cultures of MECs were used to examine EGFR protein levels and promoter activity in response to BRCA1 suppression with inhibitory RNA. EGFR was assessed by immunoblot and immunofluorescence analysis, real-time reverse transcriptase-polymerase chain reaction assay (RT-PCR) and flow cytometry. Binding of epidermal growth factor (EGF) to subpopulations of MECs was examined by Scatchard analysis. The responsiveness of MECs to the EGFR inhibitor erlotinib was assessed in vitro in three-dimensional cultures and in vivo. Mouse mammary tumor virus-Cre recombinase (MMTV-Cre) BRCA1flox/flox p53+/- mice were treated daily with erlotinib or vehicle control, and breast cancer-free survival was analyzed using the Kaplan-Meier method.Inhibition of BRCA1 in MECs led to upregulation of EGFR with an inverse correlation of BRCA1 with cellular EGFR protein levels (r2 = 0.87) and to an increase in cell surface-expressed EGFR. EGFR upregulation in response to BRCA1 suppression was mediated by transcriptional and posttranslational mechanisms. Aldehyde dehydrogenase 1 (ALDH1)-positive MECs expressed higher levels of EGFR than ALDH1-negative MECs and were expanded two- to threefold in the BRCA1-inhibited MEC population. All MECs were exquisitely sensitive to EGFR inhibition with erlotinib in vitro. EGFR inhibition in MMTV-Cre BRCA1flox/flox p53+/- female mice starting at age 3 months increased disease-free survival from 256 days in the controls to 365 days in the erlotinib-treated cohort.We propose that even partial loss of BRCA1 leads to an overall increase in EGFR expression in MECs and to an expansion of the highly EGFR-expressing, ALDH1-positive fraction. Increased EGFR expression may confer a growth advantage to MECs with loss of BRCA1 at the earliest stages of transformation. Employing EGFR inhibition with erlotinib specifically at this premalignant stage was effective in decreasing the incidence of ER-negative breast tumors in this mouse model.Primary prevention of breast cancer has t
Studying Heavy Metals in Sediments Layers along Selected Sites on the Lebanese Coast  [PDF]
Nadine NASSIF, Ziad SAADE
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.21006
Abstract: Ensuring the environmental protection of the Lebanese coast requires a continues monitoring system. For this purpose, four heavy metals (Fe, Mn, Cu and Pb in the marine sediments along the Lebanese coast were selected for analysis Sampling was carried out from two sites: Beirut and Batroun. Thus, 1g of dried sample is used for digestion by wet mineralization in order to determine the concentration of the four heavy metals by atomic absorption spectrometry. The results showed that Beirut area is polluted, by Fe and Mn as well as the station Bat 2 of Batroun. For Cu and Pb, Batroun region is more polluted in the superficial layers. The analysis also showed significant difference between the sites except for Cu. A difference between depths and between particles size fractions are observed for all the parameters studied. There is no a significant difference in layer sequence except for the Pb, and neither between the repetitions of the same sample. Results showed that the values of the four metals studied do not exceed the maximum limits at both sites, but they showed increase in comparison with the analyses obtained before July 2006 conflict, which was caused by the release of large quantity of fuel-oil from Jiyeh Power Station.
Influence of production processes in quality of fermented milk "Laban" in Lebanon  [PDF]
Zeineddine Mayssoun, Nassif Nadine
Health (Health) , 2010, DOI: 10.4236/health.2010.24057
Abstract: Yoghurt (Laban) is one of the most consumed food products in Lebanon. Thus its quality has given a concern. In this study, the sensory, chemical and rheological properties of commercial and traditional samples were investigated in order to characterize this fermented milk. Hence, Laban samples were collected from 14 areas in Lebanon; especially from mountainous regions and from the capital Beirut. Forty-two samples were provided by processing industry whether at small, medium, or large scale. A statistical analysis was carried out, and thus sensory and physicochemical properties were subjected to two approaches of variance analysis. Pearson correlation coefficients between attributes were also calculated. Both, the analyses of variance and correlations were conducted using SPSS 3. The physicochemical analysis and the microbiological analysis exhibit a significant effect of the date, and the manufacturing process. Also, the instrumental data showed no significant correlation between physicochemical and microbiological parameters, which indicates that they are completely independent. Moreover, the general appreciation of descriptive sensory analysis of products display that this appreciation is not dependant on the production process. It is also noticed that some sensory characteristics can be dread by instrumental measures. This research endorses the essential role of quality control for the manufacturing of yoghurt in Lebanon.
Preoccupation with Weight and Eating Patterns of Lebanese and Cypriot Female Students  [PDF]
Ioanna Katsounari, Nadine Zeeni
Psychology (PSYCH) , 2012, DOI: 10.4236/psych.2012.36073
Abstract: This comparative cross-cultural study explores the prevalence of preoccupation with weight and eating patterns among female university students in two distinct cultural contexts, Cyprus and Lebanon. Data was collected by means of self-administered questionnaires to 200 students from each culture. To gather the data for this study, the Dutch Eating Behavior Scale was used for the assessment of eating behaviors. Body Mass Index (BMI) and Weight directed behavior were also calculated. The Pearson Product-Moment Correlation Coefficient was used to determine whether there is a linear relationship between students’ BMI and eating behaviors. Findings suggested that with respect to culture and pre-occupation with weight, Cypriot students are more pre-occupied with their weight. However, Lebanese students received higher emotional and external eating scores. In addition, a positive relationship between Body Mass Index, restrained and emotional eating was found in both cultures Also, in both cultures there was a significant positive relationship between restrained and emotional eating, emotional and external eating. These findings suggest that in the Lebanese culture, eating dysfunction among women may be due to responsiveness to external and emotional cues while in the Cypriot culture may be due to an over pre-occupation with weight fuelled by sociocultural agents. Understanding the underlying causes of eating deviations and the existing elements in each culture which promote these deviations could lead to better prevention efforts in two societies where the rise in eating disturbances has been alarming.
“We Are Only as Strong as We Are United, as Weak as We Are Divided” a Dynamic Analysis of the Peer Support Networks in the Harry Potter Books  [PDF]
Goele Bossaert, Nadine Meidert
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32024
Abstract:

This research studied the concept of enacted peer support during adolescence by means of the Harry Potter Series. A network approach was used. Results indicated the importance of reciprocity and transitivity for enacted peer support during adolescence. Contrary to our expectations, gender, age and personality traits did not affect enacted peer support. No homophily effects based on gender and age were detected. However, students were found to be more supportive of students with similar personality traits. We hope this study adds to the current knowledge on peer support in adolescence and promotes the use of social theories and methods in literacy research.

Management of Peptic Ulcer Bleeding Refractory to Endoscopic Treatment  [PDF]
Tung Yen Lee, Cheng Cheng Tung
Open Journal of Gastroenterology (OJGas) , 2016, DOI: 10.4236/ojgas.2016.66021
Abstract: Background: Before the advent of transcatheter arterial embolization (TAE), emergency surgery was the only choice for patients with peptic ulcer bleeding refractory to endoscopic therapy. This study compared the effectiveness of TAE and surgery in patients with peptic ulcer bleeding refractory to endoscopic hemostasis. Materials and Methods: This was a retrospective analysis of 116 patients with peptic ulcer bleeding refractory to endoscopic treatment at our institution. Eighty-three cases were treated with surgery, and 33 cases were managed with TAE. Clinical outcomes were evaluated. Results: There were no differences between groups with respect to the mortality rate (p > 0.05), length of hospital stay, or medical diseases related to mortality. The TAE group exhibited a significantly higher rebleeding rate (p < 0.05). Rebleeding predominantly occurred in patients with type Ia peptic ulcers (Forrest classification) irrespective of the treatment approach. The rebleeding rates in such patents were 30.2% and 56.3% in the surgery and TAE groups, respectively. Patients with rebleeding after further therapy showed high mortality rates (68.6%). The rebleeding rate was not significantly different between the subgroups of patients with type Ia lesions, although there was a higher mortality rate in the TAE group (27.9% vs. 75%, p = 0.001). Conclusions: TAE may be the first-choice therapy for patients with peptic ulcer bleeding refractory to endoscopic treatment, whereas emergency surgery may be used as an alternative in patients with type Ia bleeding at institutions with no 24-hour radiology service or when no experienced radiologist is available.
Influence of Microstructural Changes on Some Macro Physical Properties of Cement Mortar during Accelerated Carbonation  [PDF]
Son Tung Pham
Open Journal of Civil Engineering (OJCE) , 2014, DOI: 10.4236/ojce.2014.42008
Abstract:

The objective of this work was to examine the changes in the microstructure and macro physical properties caused by the carbonation of normalised CEM II mortar. Samples were prepared and subjected to accelerated carbonation at 20°C, 65% relative humidity and 20% CO2 concentration. On the microstructure scale, the evolutions of the cumulative pore volume, pore size distribution, and specific surface area during carbonation were calculated from the adsorption desorption isotherms of nitrogen. We also examined the evolution of macro physical properties such as the solid phase volume using helium pycnometry, porosity accessible to water, gas permeability, and thermal conductivity. The conflict between nitrogen porosity and water porosity results indicated that the porous domains explored using these two techniques are different and help to complementarily evaluate the effects of carbonation. This is a multi-scale study where results on microstructural changes can help to explain the evolution of macro physical properties.

Effects of Carbonation on the Microporosity and Macro Properties of Portland Cement Mortar CEM I  [PDF]
Son Tung Pham
Journal of Materials Science and Chemical Engineering (MSCE) , 2014, DOI: 10.4236/msce.2014.27005
Abstract:

The aim of this work was to examine the microstructural changes of CEM I standardised cement mortar caused by accelerated carbonation (20% CO2 concentration) using porosity accessible to water and nitrogen adsorption. The conflicted results obtained by these two techniques showed the differences in porous domains explored, while the pore size distributions calculated from nitrogen adsorption provided evolution of the micro and meso pores during carbonation. The porosity accessible to water showed changes in all three porous domains: macro, meso and micro pores. This is because of difference in the molecular sizes between water and nitrogen molecules. Although these two techniques are different, they help to complementarily evaluate the effects of carbonation. The results also indicated the influence of type of cement on microstructural evolutions and the correlation between variations of mesopores volume and specific surface area. Changes in microstructure induce changes in macroscopic properties that we also examined such as the solid phase volume using helium pycnometry, the gas permeability, the thermal conductivity, the thermal diffusivity, and the longitudinal and transverse ultrasonic velocities.

Group Ranking Sequence Decision for Recommendation of Messaging APP  [PDF]
Wei-Feng Tung
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.27002
Abstract:

This research is to develop a novel recommendation service using a unique group ranking sequence technique “Mining Maximum Consensus Sequences from all Users’ Partial Ranking Lists (MCSP)”. MCSP is capable of determining the product’s sequence recommendations based on k-item candidate sequences and maximum consensus sequences. This paper also illustrates the complete decision procedures of group ranking sequences. In terms of popular information products, we select “messaging app” to reveal the MCSP’s group ranking sequence decision. The recommendation service provides that query users search for the product’s recommendation (i.e., messaging app) according to the preference sequences from query users themselves and a great deal of preference sequences from the other users. This paper consists of the definitions, procedures, implementation, and experiment analysis, as well as system demonstrations of MCSP respectively. This research contributes to a kind of systematic service innovation.

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