The regularity and exponential decay of solution for a linear wave equation associated with two-point boundary conditions

This paper is concerned with the existence and the regularity of global solutions to the linear wave equation associated with two-point type boundary conditions. We also investigate the decay properties of the global solutions to this problem by the construction of a suitable Lyapunov functional.Comment: 18 page

Existence, blow-up and exponential decay estimates for a nonlinear wave equation with boundary conditions of two-point type

This paper is devoted to study a nonlinear wave equation with boundary conditions of two-point type. First, we state two local existence theorems and under suitable conditions, we prove that any weak solutions with negative initial energy will blow up in finite time. Next, we give a sufficient condition to guarantee the global existence and exponential decay of weak solutions. Finally, we present numerical resultsComment: 2

Semaine d'Etude Mathématiques et Entreprises 7 : Détection d'ilôtage dans un réseau électrique

In recent years, the signiﱂcant increase in number of connections to photo- voltaic installations in the public networks has caused greater risks. Meth- ods involving in detecting situations such as islanding, damage on the trans- port network, and normal situations without special event arise have been exploited, however, each method has its disavantages. In this work, by using the statistical and signal processing tools, we can consider and appre- ciate the change of data of the simulated model. Then we apply the CART algorithm to classify the above phenomena

Determinants of customer's apartment purchase intention: is the location dominant?

The purpose of this research is to identify and measure the factors affecting the intention to buy apartments of customers in Ho Chi Minh City, Vietnam. The survey carried out with the participation of 200 customers. The authors explore five factors which affect customer's apartment purchase intention include location, features, brand, finance, and subjective norm. The result from Exploratory Factor Analysis (EFA) shows that location, features, finance, and subjective norm have a significant effect on the intention to buy customers' apartments. In which, location in Ho Chi Minh City context is the most influential factor, so, it strongly confirm the research of Adair et al. (1996), Clark et al. (2006), Daly et al. (2003), Kaynak and Stevenson (2007), Opoku and AbdulMuhmin (2010), Sengul et al. (2010), Tu and Goldfinch (1996), Xiao and Tan (2007) and Wang and Li (2006). The study also proposes some recommendations to increase the attractiveness of the apartment. What is more, developers, marketers, real estate policymakers can use the results of this research to understand the needs of customers better and satisfy customers

PHÂN TÍCH VÙNG GENE trnL-trnF CỦA CÂY SÂM CAU (Curculigo orchioides) TỰ NHIÊN THU TẠI TỈNH THỪA THIÊN HUẾ

Curculigo orchioides, a member of the genus Curculigo and the family Hypoxidaceae, is a herbal plant and has been used as traditional medicine. Currently, there is high demand for cultivating this plant. However, there has not been sufficient research into the genetic diversity to assist the authentication of the material, for example, the genetic research based on the DNA indicators of Curculigo. In this study, the gene trnL-trnF region of 15 Curculigo orchioides germplasms collected from three locations in the province were sequenced and analyzed for identification and evolution. The results show that the sequenced fragment of the gene trnL-trnF from the surveyed samples has 99% similarity and 100% coverage compared with the NC 053892 sequence of Curculigo orchioides. We identified five haplotypes of C. orchioides in the province with a haplotype diversity coefficient (Hd) of 0.705 ± 0.088. The genetic distances ranged from 0 to 0.49% among the populations. The Curculigo orchioides population in Thua Thien Hue has evolved towards balanced, neutral, and random selection because of the lack of rare alleles.Sâm cau (Curculigo orchioides), thuộc chi Curculigo, họ Hypoxidaceae, là một loài thảo dược quý và đã được người dân tin dùng để chăm sóc và bảo vệ sức khỏe. Hiện nay, nhu cầu trồng cây Sâm cau ngày càng tăng cao, nhưng các nghiên cứu dựa trên các chỉ thị DNA của Sâm cau nhằm phát triển chỉ thị để tránh nhầm lẫn trong quá trình thu mua nguyên liệu ở dạng khô vẫn chưa có nhiều. Trong nghiên cứu này, vùng gene trnL-trnF của 15 nguồn gene Sâm cau thu hái từ ba khu vực thuộc tỉnh Thừa Thiên Huế đã được giải trình tự và phân tích nhằm phục vụ cho công tác định danh, phân loại và phân tích sự tiến hoá. Kết quả cho thấy vùng gene trnL-trnF của các mẫu nghiên cứu có trình tự tương đồng 99% và độ bao phủ 100% so với trình tự NC 053892 của loài Curculigo orchioides. Chúng tôi đã xác định được năm loại haplotype tại tỉnh Thừa thiên Huế với hệ số đa dạng haplotype (Hd) 0,705 ± 0,088. Mức độ khác biệt di truyền giữa các quần thể dao động từ 0 đến 0,49%. Quần thể Sâm cau ở tỉnh Thừa Thiên Huế tiến hoá theo hướng chọn lọc cân bằng, trung tính và quần thể ngẫu nhiên do thiếu các allen hiếm xuất hiện trong quần thể

The relationship between brand equity and intention to buy: the case of convenience stores

The research aims to identify the components of brand equity that affect consumer purchasing intentions and measure the effect of brand equity components on the intention of consumer purchases at the convenience stores in Ho Chi Minh City. The authors conduct the group discussions, expert discussion, and then analyze data from 200 valid questionnaires with four components of brand equity, namely perceived quality, brand loyalty, brand association, brand awareness. The results of Exploratory Factor Analysis (EFA) show that all four elements have a positive effect on the customer' intention to purchase in the convenience store of Ho Chi Minh City. In particular, the brand association factor has the strongest influence, followed by perceived quality, brand awareness, and brand loyalty. This research contributes that the results confirm the theory of Aaker (1991), Brown and Stayman (1992), Cobb-Walgren et al. (1995), MacKenzie (1986) in the new context of convenience stores in Ho Chi Minh City, Vietnam. Besides, the study gives some recommendations to help convenience stores improve the elements of brand equity and it, to enhance attraction for consumers

Determinants of organic food purchasing intention: an empirical study of local consumers in Da Nang city, Central Vietnam

With the rapid economic development in the past decades, Vietnamese people are more and more aware of the role of safe food for their health and that of their families. Currently, the trend of organic food consumption is happening faster, especially in urban areas. The study aims to determine the influence of transparent information and knowledge about organic products on consumers' attitudes, trust, and subjective norms affecting their purchase intention of organic products. Data were collected from 420 consumers in Da Nang city, Central Vietnam. Exploratory Factor Analysis (EFA) method and Structural Equation Modeling (SEM) were used to evaluate the scale's reliability and identify the impact factors. The results show that attitudes and trust have a positive relationship with the intention to buy organic food. In addition, research shows that trust is a predecessor of attitudes and mediates the relationship between information, knowledge about organic food, and intention to buy organic food. The study's findings are consistent with previous literature and provide implications for food managers, organic food businesses, and the community

Quality of Life and Suitability with Vietnamese Harmonious Face Index in Class III Malocclusion Patients

BACKGROUND: Maxillary Lefort I osteotomy, mandibular bilateral sagittal split ramus was frequently used in correcting skeletal class III malocclusion. There was a lack of research on class III malocclusion patients’ quality of life (QoL) after bimaxillary osteotomy. AIM: Class I Intermaxillary relationship was achieved, aesthetic was significantly improved. Significant improvement in Class III skeletal patients’ quality of life was acquired. The achievement of harmonious face would be beneficial to the facial aesthetics of patients, thus improving the quality of life. METHODS: Harmonious face index is an effective criterion in assessing the surgery’s outcome. In this study was conducted on 30 patients at Hanoi National Hospital of Odontostomatology, Viet Duc Hospital, and Hong Ngoc Hospital from April 2017 to April 2018, and it was a quasi-experimental study with self-comparison, 12 months follow up. RESULTS: Orthognathic surgery effectively corrected malocclusion crossbite, dental compensation, and helped to improve facial aesthetics. 100% of patients had the quality of life improved, good quality of life consisted of 86.7%. In comparison with a harmonious facial index of Kinh ethnic in Vietnam, 70% of patients achieved skeletal harmony, 63.3% of patients achieved dental harmony, 80% achieved soft tissue harmony. CONCLUSIONS: Vietnamese harmonious facial index should be used in planning and pre-surgical simulatio

Growth and development of transgenic peanut (Arachis hypogaea) lines containing chitinase 42 kDa gene from Trichoderma asperellum SH16

Peanut (Arachis hypogaea L.) is vulnerable to many diseases. Vietnam and other regions where peanut is widely cultivated have a high threat of fungal and other plant diseases. Various fungicides are available to control the fungal disease but these have various harmful effects on the natural flora, fauna, and environment. Transgenic peanut lines which possess antifungal activity provide a possible solution in managing fungal diseases apart from the traditional resistance and fungicide usage. Therefore, this study evaluated the probable growth and development of chitinase transgenic peanut lines against Sclerotium rolfsii, a pathogen that causes “southern blight” in plants, under greenhouse conditions. This study provided evidence that through Agrobacterium itumefaciens mediated transformation, 42 kDa chitinase genes from Trichoderma asperellum, which is under the regulation of 35S promoter, were successfully incorporated into the peanut’s (A. hypogaea L.) genome and expressed in their plants. This evidence also demonstrated that transgenic peanut lines were suitable for growing and developing in the greenhouse. Further, it was reported that transgenic peanut lines took approximately 133 to 145 days from planting to maturity. These results also revealed that various growth characteristics of transgenic peanut lines having two synthetic genes (syncod Chi42-2 i.e. S2-2, S2-4, S2-6, and syncod Chi42-1 i.e. S1-1, S1-2, S1-3) were greater than that from the wild-type Chi42 (WT-1, WT-2, and WT-3). In addition, yield-related parameters including the number of mature pods, 100 pods weight and 100 seeds weight for all the transgenic peanut lines were higher than that of the non-transformed plant. Among the transgenic lines, line S2-4 exhibited significantly higher growth and yield than the other transgenic lines. These results demonstrated that 42 kDa chitinase genes overexpressing peanut lines could be a candidate for improvement against plants to phytopathogenic fungus S. rolfsii and high yield.