Trần Khoa - Academia.edu (original) (raw)
Papers by Trần Khoa
Parasitology Research, 2019
Examination of 35 barramundi (Lates calcarifer) from aquaculture cages in Setiu Wetland, Malaysia... more Examination of 35 barramundi (Lates calcarifer) from aquaculture cages in Setiu Wetland, Malaysia, revealed a single fish infected with three Henneguya spp. (Cnidaria: Myxosporea). Characterization of the infections using tissue tropism, myxospore morphology and morphometry and 18S rDNA sequencing supported description of three new species: Henneguya setiuensis n. sp., Henneguya voronini n. sp. and H. calcarifer n. sp. Myxospores of all three species had typical Henneguya morphology, with two polar capsules in the plane of the suture, an oval spore body, smooth valve cell surfaces, and two caudal appendages. Spores were morphometrically similar, and many dimensions overlapped, but H. voronini n. sp. had shorter caudal appendages compared with H. calcarifer n. sp. and H. setiuensis n. sp. Gross tissue tropism distinguished the muscle parasite H. calcarifer n. sp. from gill parasites H. setiuensis n. sp. and H. voronini n. sp.; and these latter two species were further separable by fi...
Sustainability, 2021
The global increase of urban solid waste in developing countries is creating highly significant c... more The global increase of urban solid waste in developing countries is creating highly significant challenges. There is a lack of research on sustainable waste management behavior (SWMB) among university academic staff. Hence, this study aims to examine the effect of attitude, subjective norm, and perceived behavior control on SWMB. This study employed the theory of planned behavior (TPB) as the underlying theory. This study’s sample consisted of 252 academic staff from the top three sustainable universities in Malaysia listed by the UiGreenMetric in 2018. The academic staff were surveyed by using an online and self-administered survey and analyzed by using PLS-SEMThe results showed that attitude, subjective norms, and perceived behavioral control positively affect SWMB. This study makes significant contributions to both theory and practice. The study fills in the literature gap and supports the TPB theory. This study provides empirical evidence on the effect of main TPB variables, suc...
International Journal of Heat and Technology, 2021
VOCl3 and TiCl4 exhibit a similarity of various thermal properties, causing difficulty for these ... more VOCl3 and TiCl4 exhibit a similarity of various thermal properties, causing difficulty for these components separation through distillation technique. Dynamic behavior of distillation process of VOCl3-TiCl4 mixture was modeled based on the mass and energy balances, revealing in a model form of the ordinary differential equations. Influences of heating power, airflow, initial concentration, and operating pressure were considered. Simulation results show an ineffective distillation of the mixture under natural pressure. However, the reduction of the operating pressure advanced the pure TiCl4 recovery performance. Compared to experimental data, the relative error of the simulation findings is less than 5%, indicating the potential of the application of the proposed model for describing the distillation of the VOCl3-TiCl4 mixture.
Setiu Wetlands is located along the Terengganu coastline which comprises various ecosystems provi... more Setiu Wetlands is located along the Terengganu coastline which comprises various ecosystems providing a suitable natural environment for breeding and grow out of various organisms. The mud crab is considered to be one of the important natural resources and a source of income for the local community in the Setiu Wetlands. The aim of this study is to develop the breeding and larviculture technology of mud crab (Scylla paramamosian) for conservation and livelihood activities in Setiu Wetland. The matured broodstock of mud crab was collected from Setiu Wetland and transferred to AKUATROP hatchery in Universiti Malaysia Terengganu for the breeding experiments. After eyestalk ablation, crabs were separately cultured in 50L dark tanks with sandy bottom connected with recirculating systems and fed trash fish and with blood cockle twice a day. After egg spawning, ovigerous crabs were moved to incubated tanks with continuous aeration and not fed until hatching. Strong phototactic larvae were ...
Journal of Science and Technology - IUH, 2021
Phát triển nhà thông minh luôn là một trong những chủ đề được quan tâm bởi những nhà nghiên cứu v... more Phát triển nhà thông minh luôn là một trong những chủ đề được quan tâm bởi những nhà nghiên cứu về mạng lưới vạn vật kết nối. Trong bài báo này, nhóm đề xuất xây dựng mô hình nhà thông minh thân thiện với người dùng, tích hợp hệ thống giám sát và tự động điều khiển thiết bị. Hệ thống giám sát của ngôi nhà sử dụng camera để nhận diện chủ nhân, đồng thời gởi tin nhắn cho chủ nhân khi phát hiện người lạ xung quanh khu vực giám sát của ngôi nhà. Hệ thống tự động điều khiển thiết bị bao gồm các các chức năng như tự động bật/tắt đèn khi có chuyển động, tự động điều chỉnh độ sáng đèn tùy theo điều kiện ánh sáng trong nhà, tự động cân bằng nhiệt độ và độ ẩm bên trong ngôi nhà phù hợp với môi trường bên ngoài dựa trên các tình huống được thiết lập sẵn, báo động và gởi tin nhắn cho chủ nhân qua Telegram botchat khi khí gas trong nhà vượt ngưỡng cho phép, tự động thiết lập chế độ tiết kiệm điện năng khi không có người trong nhà. Việc xây dựng mô hình ngôn nhà thông minh của chúng tôi sử dụng c...
HCMCOUJS - ECONOMICS AND BUSINESS ADMINISTRATION, 2020
The main purpose of this study is to investigate the effects of perceived Corporate Social Respon... more The main purpose of this study is to investigate the effects of perceived Corporate Social Responsibility (CSR) practices on customers’ satisfaction and perceived value. According to the result of the literature review, the studied CSR practices include environmental protection, customer protection, community, HR policies, price, product quality, relationship selling, empathy, and fulfill expectations. To address the research objective, the present study proposed two following research questions: (1) What are factors of CSR practices impacting customers’ satisfaction?; and (2) How do these factors influence customer satisfaction and perceived value? The study approached 236 customers of the food industry to conduct a survey empirically and tested the proposed hypotheses using structural equation modeling. The research findings show that (1), in Vietnamese customers perceptions, Perceived price, Perceived quality and Empathy are three components of CSR practices; (2) these components...
HCMCOUJS - ECONOMICS AND BUSINESS ADMINISTRATION, 2020
Social ties and their influences on firm’s performance are still issues of many debates. The reas... more Social ties and their influences on firm’s performance are still issues of many debates. The reason is that previous studies gave different findings about the effects of social ties on firm’s performance. This study, therefore, focuses on finding what managers in construction firms perceive of social ties in their business and how these ties affect corporate social responsibility (CSR) practices – an aspect of firm’s performance. To address these research objectives, qualitative approach is employed and in-depth interview with managers in construction firms is conducted to collect the data. Furthermore, the study also explores how managers think of CSR changes in the near future. The research findings show that interviewees strongly believe in CSR changes including both internal and external changes. In terms of social ties, the research also identifies government authorities and professional associations; and business partners as political and business ties, respectively. The findi...
Journal of Advanced Biotechnology and Experimental Therapeutics, 2020
The superior gluteal artery (SGA) perforator flap (SGAP) used to cover lumbosacral soft tissue de... more The superior gluteal artery (SGA) perforator flap (SGAP) used to cover lumbosacral soft tissue defects, in order to take advantage of the SGAP flap, all surgeons are required to have substantial knowledge of its cutaneous distribution of perforator. This study describes the anatomical characteristics of the perforators of SGA on Vietnamese adults; and locates the perforator of SGA on the gluteal region. We carried out on 32 Vietnamese adult cadavers at Department of Anatomy of Ho Chi Minh University of Medicine and Pharmacy, from Jan 2017 to June 2019. On average, SGA gives off 4-5 perforators, while none was found on the deep branch. The average length of perforator from the skin to the dissecting point is short compared to that of from skin to origin diameter at origin is quite large (1mm). The chance of finding 3-5 perforators in the upper triangle is 75% and 87% on the right and left side, respectively. Also, the probability of finding a single perforator in the upper triangle is 100% based on the x-axis, most perforators are found in segment 2/5 to segment 3/5 with the center being the midpoint between two segments; based on the y-axis, most perforators are found in segment 1.5/5 to segment 3.5/5 with the center being the midpoint between the two.
Thalassas: An International Journal of Marine Sciences, 2019
Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high ... more Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high mortality during early larval stages exhibits a significant bottleneck to their mass seed production. Operational enzymatic variables were investigated for further studies on feeding optimization. Ontogenetic change of the digestive system of S. paramamosain was enzymatically (trypsin, chymotrypsin, pepsin, amylase and alkaline phosphatase) evaluated. Results showed that these enzymes were already presented in the larvae before exogenous feeding. The first detection after hatching was low activity and gradually increased from Z3 except trypsin, and chymotrypsin activity increased from Z5 stage. Alkaline phosphatase activity peaked at Z2 and Z4, followed by a sharp fall in Z5 and megalope. Trypsin and Chymotrypsin activities were also decreased from Z3 to Z5, then sharply increased from Z5; however, Chymotrypsin activity decreased after megalope stage. Pepsin activity was detectable after hatching and regularly increased through the larval development. Amylase activity was low from hatching to Z3 and then suddenly increased. Alkaline phosphatase activity was recorded with the highest activity at Z2 and Z4, then complex variation, particularly at Z3 and megalope stage. The study constitutes physiological information on ontogenic development as well as the digestive abilities of mud crab larvae further, facilitates feeding diet formulation and larviculture of this species.
Aquaculture Research, 2019
Thalassas: An International Journal of Marine Sciences, 2018
Caligus minimus, known as a sea louse, is a very important pathogen of sea floating cage culture.... more Caligus minimus, known as a sea louse, is a very important pathogen of sea floating cage culture. This paper describes the life cycle of Caligus minimus isolated from seabass culture in the cage in Penang, Malaysia. The parasitic copepod development was observed at 30°C and 20°C, with ambient photoperiod under laboratory conditions. Female of Caligus minimus with matured eggs were collected and incubated in a beaker with slow aeration. The life cycle consists of nine stages: two nauplii, one copepodid, four chalimi, pre-adult, and adult. The copepodid is infective, and all subsequent stages were attached to fish and did not require an intermediate host for its development. The eggs hatched out within 48 h at 30°C and within 60 h at 20°C, and two nauplii stages were recorded after 1.88 ± 0.74 h and 4.23 ± 1.02 h, respectively. Copepodid stage was informed after 24.91 ± 2.24 h. A single experiment conducted by exposing an uninfected sea bass fingerling to copepod showed the copepodid immediately attached to the body, fins, and gills of the fish. Chalimus stage was observed after 20.95 ± 3.70 h followed by pre-adult stage after 45.88 ± 5.95 h. Within 44.5 ± 1.08 h, the adult was found and showed the female became mature and lay the eggs after 43.25 ± 3.11 h. At 20°C, Copepodid was recorded after 25.86 ± 1.40 h and completed Chalimus stage within 40 h. Conclusively, 5.5-10 days were needed for Caligus minimus to complete its life cycle at tested temperature.
Hue University Journal of Science: Agriculture and Rural Development, 2014
Thực hiện thí nghiệm đồng ruộng trong vụ Hè Thu 2012 và Đông Xuân 2012 – 2013 trên đất cát nội đồ... more Thực hiện thí nghiệm đồng ruộng trong vụ Hè Thu 2012 và Đông Xuân 2012 – 2013 trên đất cát nội đồng tại huyện Phú Vang, tỉnh Thừa Thiên Huế nhằm nghiên cứu khả năng thay thế phân đạm vô cơ bằng phân sinh học WEHG trên giống lúa BT7. Kết quả cho thấy, việc thay thế phân đạm vô bằng phân sinh học WEHG không ảnh hưởng đến sinh trưởng, phát triển và năng suất của giống lúa BT7.Bón phối hợp giữa phân đạm vô cơ và phân sinh học WEHG cho hiệu quả kinh tế cao hơn so với công thức không bón phân sinh học WEHG. Bón phân với liều lượng 1 tấn phân hữu cơ vi sinh Sông Hương + 80 kg N + 70 kg P205 + 70 kg K20+ 5 lít WEHG cho hiệu quả kinh tế cao nhất. Bón phân sinh học WEHG còn cải thiện một số tính chất đất như pHKCl, OC, N, số lượng vi sinh vật trong đất.Từ khóa: Giống BT7, lúa, phân sinh học, Thừa Thiên Huế, WEHG.
Extended Abstracts of the 2003 International Conference on Solid State Devices and Materials, 2003
In cellular systems, hotspot communication can be established to support the high-traffic areas b... more In cellular systems, hotspot communication can be established to support the high-traffic areas by using the same frequency band of the original cellular systems. However, interference from the hotspots deteriorates the communication performance of original cellular system. In this paper, in order to decrease these interference, we set up the access point of hotspots with the adaptive array antenna and code assignment method between the cellular and the hotspot communication are considered. OFDM hotspot communication is overlapped to the uplink of MC/DS-CDMA cellular system in the same frequency band and we propose the beam forming method to eliminate inter-system interference. Moreover, by allocating orthogonal variable spreading factors (OVSF) code to the both hotspot users and cellular users in the hotspot uplink period, the orthogonality of each user is kept. As a result, we can embed many hotspots into the cellular system with very small interference toward the uplink communica...
Advanced Studies in Biology, 2013
We have sequenced the internal transcribed spacer (ITS) region (including ITS1, 5.8S, and ITS2) o... more We have sequenced the internal transcribed spacer (ITS) region (including ITS1, 5.8S, and ITS2) of 16 species and two varieties of the slipper orchid genus Paphiopedilum in Vietnam. The identification of relationship between those species was also assessed using molecular tool. Most of slipper orchid species in Vietnam are now endangered or threatened to extinction due high demand of ornamental trade of these beautiful species. However, it is difficult to distinguish them without their flowers. Therefore, it is needed to develop molecular markers to accurately identify these species. Our present study is in the view to set the first steps in constructing a molecular database of slipper orchids for future assessment of inter-and intra-specific molecular diversity of Paphiopedilum species from Vietnam, to contribute to the conservation of these valuable orchids. The results showed that highly variable areas (that contain many indels) in ITS region are useful for phylogenetic analysis as the dataset containing these long-indels areas and gave better Jack-knife supports in resolving the relationships of Paphiopedilum species than the modified dataset did.
2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595)
We reported a new operating principle of ferroelectric gate FET memory. With an intermediate elec... more We reported a new operating principle of ferroelectric gate FET memory. With an intermediate electrode inserted between a ferroelectric capacitor and a MIS-FET, the memory is potential to solve problems of short retention time, high operation voltage and instability performance of conventional ferroelectric gate FET memory. The memory was experimentally and theoretically investigated and was verified to be practicable.
Wireless Communications and Mobile Computing, 2008
In multi‐carrier CDMA cellular systems, hotspot communication can be established to support the h... more In multi‐carrier CDMA cellular systems, hotspot communication can be established to support the high‐traffic areas by using the same frequency band of the original cellular systems. However, interference from the hotspots deteriorates the communication performance of the original cellular system. In this paper, in order to decrease the interference, we set up the access point (AP) of hotspots with the adaptive array antenna and code assignment method between the cellular and the hotspot communication is considered. In the proposed system, OFDM hotspot communication is overlapped to the uplink of MC/DS‐CDMA cellular system in the same frequency band and the beam‐forming method is applied to eliminate inter‐system interference. Moreover, by allocating orthogonal variable spreading factors (OVSF) code to the both hotspot users and cellular users in the hotspot uplink period, the orthogonality of each user is kept. As a result, we can embed many hotspots into the cellular system with ve...
Thalassas: An International Journal of Marine Sciences, 2019
Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high ... more Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high mortality during early larval stages exhibits a significant bottleneck to their mass seed production. Operational enzymatic variables were investigated for further studies on feeding optimization. Ontogenetic change of the digestive system of S. paramamosain was enzymatically (trypsin, chymotrypsin, pepsin, amylase and alkaline phosphatase) evaluated. Results showed that these enzymes were already presented in the larvae before exogenous feeding. The first detection after hatching was low activity and gradually increased from Z3 except trypsin, and chymotrypsin activity increased from Z5 stage. Alkaline phosphatase activity peaked at Z2 and Z4, followed by a sharp fall in Z5 and megalope. Trypsin and Chymotrypsin activities were also decreased from Z3 to Z5, then sharply increased from Z5; however, Chymotrypsin activity decreased after megalope stage. Pepsin activity was detectable after hatching and regularly increased through the larval development. Amylase activity was low from hatching to Z3 and then suddenly increased. Alkaline phosphatase activity was recorded with the highest activity at Z2 and Z4, then complex variation, particularly at Z3 and megalope stage. The study constitutes physiological information on ontogenic development as well as the digestive abilities of mud crab larvae further, facilitates feeding diet formulation and larviculture of this species.
Thin Solid Films, 2002
We investigated the crystalline quality and resistivity of an epitaxial Ir film deposited on an e... more We investigated the crystalline quality and resistivity of an epitaxial Ir film deposited on an epitaxial (1 0 0)YSZy(1 0 0)Si substrate by RF magnetron sputtering method. It has been reported that the orientation of Ir film deposited on YSZ film depends on the deposition rate. In our case, the surface of the YSZySi structure was cleaned by diluted HF solution, just before loading the sample to the sputtering chamber. It was found that even when the sputtering gas pressure was increased to 15 Pa and the deposition rate from 0.5 to 60 nmymin, respectively, the Ir film was still epitaxially grown with a high (1 0 0) orientation. This is because the diluted HF solution treatment cleaned off the YSZySi surface. When the deposition rate was increased, the crystalline quality and resistivity of the film were decreased and increased, respectively.
Aquaculture Research, 2019
The marine finfish culture in Malaysia has been promoted and has become an important engine of na... more The marine finfish culture in Malaysia has been promoted and has become an important engine of national aquaculture production (Yusoff, 2015). Among marine fish seabass, Asian seabass (Lates calcarifer) cage farm is becoming more popular due to its economic advantages (FAO, 2015; Yap et al., 2005). L. calcarifer is a carnivorous euryhaline fish cultured both in ponds or floating cages throughout the year, hence it is considered as a good candidate for aquaculture
Parasitology Research, 2019
Examination of 35 barramundi (Lates calcarifer) from aquaculture cages in Setiu Wetland, Malaysia... more Examination of 35 barramundi (Lates calcarifer) from aquaculture cages in Setiu Wetland, Malaysia, revealed a single fish infected with three Henneguya spp. (Cnidaria: Myxosporea). Characterization of the infections using tissue tropism, myxospore morphology and morphometry and 18S rDNA sequencing supported description of three new species: Henneguya setiuensis n. sp., Henneguya voronini n. sp. and H. calcarifer n. sp. Myxospores of all three species had typical Henneguya morphology, with two polar capsules in the plane of the suture, an oval spore body, smooth valve cell surfaces, and two caudal appendages. Spores were morphometrically similar, and many dimensions overlapped, but H. voronini n. sp. had shorter caudal appendages compared with H. calcarifer n. sp. and H. setiuensis n. sp. Gross tissue tropism distinguished the muscle parasite H. calcarifer n. sp. from gill parasites H. setiuensis n. sp. and H. voronini n. sp.; and these latter two species were further separable by fi...
Sustainability, 2021
The global increase of urban solid waste in developing countries is creating highly significant c... more The global increase of urban solid waste in developing countries is creating highly significant challenges. There is a lack of research on sustainable waste management behavior (SWMB) among university academic staff. Hence, this study aims to examine the effect of attitude, subjective norm, and perceived behavior control on SWMB. This study employed the theory of planned behavior (TPB) as the underlying theory. This study’s sample consisted of 252 academic staff from the top three sustainable universities in Malaysia listed by the UiGreenMetric in 2018. The academic staff were surveyed by using an online and self-administered survey and analyzed by using PLS-SEMThe results showed that attitude, subjective norms, and perceived behavioral control positively affect SWMB. This study makes significant contributions to both theory and practice. The study fills in the literature gap and supports the TPB theory. This study provides empirical evidence on the effect of main TPB variables, suc...
International Journal of Heat and Technology, 2021
VOCl3 and TiCl4 exhibit a similarity of various thermal properties, causing difficulty for these ... more VOCl3 and TiCl4 exhibit a similarity of various thermal properties, causing difficulty for these components separation through distillation technique. Dynamic behavior of distillation process of VOCl3-TiCl4 mixture was modeled based on the mass and energy balances, revealing in a model form of the ordinary differential equations. Influences of heating power, airflow, initial concentration, and operating pressure were considered. Simulation results show an ineffective distillation of the mixture under natural pressure. However, the reduction of the operating pressure advanced the pure TiCl4 recovery performance. Compared to experimental data, the relative error of the simulation findings is less than 5%, indicating the potential of the application of the proposed model for describing the distillation of the VOCl3-TiCl4 mixture.
Setiu Wetlands is located along the Terengganu coastline which comprises various ecosystems provi... more Setiu Wetlands is located along the Terengganu coastline which comprises various ecosystems providing a suitable natural environment for breeding and grow out of various organisms. The mud crab is considered to be one of the important natural resources and a source of income for the local community in the Setiu Wetlands. The aim of this study is to develop the breeding and larviculture technology of mud crab (Scylla paramamosian) for conservation and livelihood activities in Setiu Wetland. The matured broodstock of mud crab was collected from Setiu Wetland and transferred to AKUATROP hatchery in Universiti Malaysia Terengganu for the breeding experiments. After eyestalk ablation, crabs were separately cultured in 50L dark tanks with sandy bottom connected with recirculating systems and fed trash fish and with blood cockle twice a day. After egg spawning, ovigerous crabs were moved to incubated tanks with continuous aeration and not fed until hatching. Strong phototactic larvae were ...
Journal of Science and Technology - IUH, 2021
Phát triển nhà thông minh luôn là một trong những chủ đề được quan tâm bởi những nhà nghiên cứu v... more Phát triển nhà thông minh luôn là một trong những chủ đề được quan tâm bởi những nhà nghiên cứu về mạng lưới vạn vật kết nối. Trong bài báo này, nhóm đề xuất xây dựng mô hình nhà thông minh thân thiện với người dùng, tích hợp hệ thống giám sát và tự động điều khiển thiết bị. Hệ thống giám sát của ngôi nhà sử dụng camera để nhận diện chủ nhân, đồng thời gởi tin nhắn cho chủ nhân khi phát hiện người lạ xung quanh khu vực giám sát của ngôi nhà. Hệ thống tự động điều khiển thiết bị bao gồm các các chức năng như tự động bật/tắt đèn khi có chuyển động, tự động điều chỉnh độ sáng đèn tùy theo điều kiện ánh sáng trong nhà, tự động cân bằng nhiệt độ và độ ẩm bên trong ngôi nhà phù hợp với môi trường bên ngoài dựa trên các tình huống được thiết lập sẵn, báo động và gởi tin nhắn cho chủ nhân qua Telegram botchat khi khí gas trong nhà vượt ngưỡng cho phép, tự động thiết lập chế độ tiết kiệm điện năng khi không có người trong nhà. Việc xây dựng mô hình ngôn nhà thông minh của chúng tôi sử dụng c...
HCMCOUJS - ECONOMICS AND BUSINESS ADMINISTRATION, 2020
The main purpose of this study is to investigate the effects of perceived Corporate Social Respon... more The main purpose of this study is to investigate the effects of perceived Corporate Social Responsibility (CSR) practices on customers’ satisfaction and perceived value. According to the result of the literature review, the studied CSR practices include environmental protection, customer protection, community, HR policies, price, product quality, relationship selling, empathy, and fulfill expectations. To address the research objective, the present study proposed two following research questions: (1) What are factors of CSR practices impacting customers’ satisfaction?; and (2) How do these factors influence customer satisfaction and perceived value? The study approached 236 customers of the food industry to conduct a survey empirically and tested the proposed hypotheses using structural equation modeling. The research findings show that (1), in Vietnamese customers perceptions, Perceived price, Perceived quality and Empathy are three components of CSR practices; (2) these components...
HCMCOUJS - ECONOMICS AND BUSINESS ADMINISTRATION, 2020
Social ties and their influences on firm’s performance are still issues of many debates. The reas... more Social ties and their influences on firm’s performance are still issues of many debates. The reason is that previous studies gave different findings about the effects of social ties on firm’s performance. This study, therefore, focuses on finding what managers in construction firms perceive of social ties in their business and how these ties affect corporate social responsibility (CSR) practices – an aspect of firm’s performance. To address these research objectives, qualitative approach is employed and in-depth interview with managers in construction firms is conducted to collect the data. Furthermore, the study also explores how managers think of CSR changes in the near future. The research findings show that interviewees strongly believe in CSR changes including both internal and external changes. In terms of social ties, the research also identifies government authorities and professional associations; and business partners as political and business ties, respectively. The findi...
Journal of Advanced Biotechnology and Experimental Therapeutics, 2020
The superior gluteal artery (SGA) perforator flap (SGAP) used to cover lumbosacral soft tissue de... more The superior gluteal artery (SGA) perforator flap (SGAP) used to cover lumbosacral soft tissue defects, in order to take advantage of the SGAP flap, all surgeons are required to have substantial knowledge of its cutaneous distribution of perforator. This study describes the anatomical characteristics of the perforators of SGA on Vietnamese adults; and locates the perforator of SGA on the gluteal region. We carried out on 32 Vietnamese adult cadavers at Department of Anatomy of Ho Chi Minh University of Medicine and Pharmacy, from Jan 2017 to June 2019. On average, SGA gives off 4-5 perforators, while none was found on the deep branch. The average length of perforator from the skin to the dissecting point is short compared to that of from skin to origin diameter at origin is quite large (1mm). The chance of finding 3-5 perforators in the upper triangle is 75% and 87% on the right and left side, respectively. Also, the probability of finding a single perforator in the upper triangle is 100% based on the x-axis, most perforators are found in segment 2/5 to segment 3/5 with the center being the midpoint between two segments; based on the y-axis, most perforators are found in segment 1.5/5 to segment 3.5/5 with the center being the midpoint between the two.
Thalassas: An International Journal of Marine Sciences, 2019
Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high ... more Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high mortality during early larval stages exhibits a significant bottleneck to their mass seed production. Operational enzymatic variables were investigated for further studies on feeding optimization. Ontogenetic change of the digestive system of S. paramamosain was enzymatically (trypsin, chymotrypsin, pepsin, amylase and alkaline phosphatase) evaluated. Results showed that these enzymes were already presented in the larvae before exogenous feeding. The first detection after hatching was low activity and gradually increased from Z3 except trypsin, and chymotrypsin activity increased from Z5 stage. Alkaline phosphatase activity peaked at Z2 and Z4, followed by a sharp fall in Z5 and megalope. Trypsin and Chymotrypsin activities were also decreased from Z3 to Z5, then sharply increased from Z5; however, Chymotrypsin activity decreased after megalope stage. Pepsin activity was detectable after hatching and regularly increased through the larval development. Amylase activity was low from hatching to Z3 and then suddenly increased. Alkaline phosphatase activity was recorded with the highest activity at Z2 and Z4, then complex variation, particularly at Z3 and megalope stage. The study constitutes physiological information on ontogenic development as well as the digestive abilities of mud crab larvae further, facilitates feeding diet formulation and larviculture of this species.
Aquaculture Research, 2019
Thalassas: An International Journal of Marine Sciences, 2018
Caligus minimus, known as a sea louse, is a very important pathogen of sea floating cage culture.... more Caligus minimus, known as a sea louse, is a very important pathogen of sea floating cage culture. This paper describes the life cycle of Caligus minimus isolated from seabass culture in the cage in Penang, Malaysia. The parasitic copepod development was observed at 30°C and 20°C, with ambient photoperiod under laboratory conditions. Female of Caligus minimus with matured eggs were collected and incubated in a beaker with slow aeration. The life cycle consists of nine stages: two nauplii, one copepodid, four chalimi, pre-adult, and adult. The copepodid is infective, and all subsequent stages were attached to fish and did not require an intermediate host for its development. The eggs hatched out within 48 h at 30°C and within 60 h at 20°C, and two nauplii stages were recorded after 1.88 ± 0.74 h and 4.23 ± 1.02 h, respectively. Copepodid stage was informed after 24.91 ± 2.24 h. A single experiment conducted by exposing an uninfected sea bass fingerling to copepod showed the copepodid immediately attached to the body, fins, and gills of the fish. Chalimus stage was observed after 20.95 ± 3.70 h followed by pre-adult stage after 45.88 ± 5.95 h. Within 44.5 ± 1.08 h, the adult was found and showed the female became mature and lay the eggs after 43.25 ± 3.11 h. At 20°C, Copepodid was recorded after 25.86 ± 1.40 h and completed Chalimus stage within 40 h. Conclusively, 5.5-10 days were needed for Caligus minimus to complete its life cycle at tested temperature.
Hue University Journal of Science: Agriculture and Rural Development, 2014
Thực hiện thí nghiệm đồng ruộng trong vụ Hè Thu 2012 và Đông Xuân 2012 – 2013 trên đất cát nội đồ... more Thực hiện thí nghiệm đồng ruộng trong vụ Hè Thu 2012 và Đông Xuân 2012 – 2013 trên đất cát nội đồng tại huyện Phú Vang, tỉnh Thừa Thiên Huế nhằm nghiên cứu khả năng thay thế phân đạm vô cơ bằng phân sinh học WEHG trên giống lúa BT7. Kết quả cho thấy, việc thay thế phân đạm vô bằng phân sinh học WEHG không ảnh hưởng đến sinh trưởng, phát triển và năng suất của giống lúa BT7.Bón phối hợp giữa phân đạm vô cơ và phân sinh học WEHG cho hiệu quả kinh tế cao hơn so với công thức không bón phân sinh học WEHG. Bón phân với liều lượng 1 tấn phân hữu cơ vi sinh Sông Hương + 80 kg N + 70 kg P205 + 70 kg K20+ 5 lít WEHG cho hiệu quả kinh tế cao nhất. Bón phân sinh học WEHG còn cải thiện một số tính chất đất như pHKCl, OC, N, số lượng vi sinh vật trong đất.Từ khóa: Giống BT7, lúa, phân sinh học, Thừa Thiên Huế, WEHG.
Extended Abstracts of the 2003 International Conference on Solid State Devices and Materials, 2003
In cellular systems, hotspot communication can be established to support the high-traffic areas b... more In cellular systems, hotspot communication can be established to support the high-traffic areas by using the same frequency band of the original cellular systems. However, interference from the hotspots deteriorates the communication performance of original cellular system. In this paper, in order to decrease these interference, we set up the access point of hotspots with the adaptive array antenna and code assignment method between the cellular and the hotspot communication are considered. OFDM hotspot communication is overlapped to the uplink of MC/DS-CDMA cellular system in the same frequency band and we propose the beam forming method to eliminate inter-system interference. Moreover, by allocating orthogonal variable spreading factors (OVSF) code to the both hotspot users and cellular users in the hotspot uplink period, the orthogonality of each user is kept. As a result, we can embed many hotspots into the cellular system with very small interference toward the uplink communica...
Advanced Studies in Biology, 2013
We have sequenced the internal transcribed spacer (ITS) region (including ITS1, 5.8S, and ITS2) o... more We have sequenced the internal transcribed spacer (ITS) region (including ITS1, 5.8S, and ITS2) of 16 species and two varieties of the slipper orchid genus Paphiopedilum in Vietnam. The identification of relationship between those species was also assessed using molecular tool. Most of slipper orchid species in Vietnam are now endangered or threatened to extinction due high demand of ornamental trade of these beautiful species. However, it is difficult to distinguish them without their flowers. Therefore, it is needed to develop molecular markers to accurately identify these species. Our present study is in the view to set the first steps in constructing a molecular database of slipper orchids for future assessment of inter-and intra-specific molecular diversity of Paphiopedilum species from Vietnam, to contribute to the conservation of these valuable orchids. The results showed that highly variable areas (that contain many indels) in ITS region are useful for phylogenetic analysis as the dataset containing these long-indels areas and gave better Jack-knife supports in resolving the relationships of Paphiopedilum species than the modified dataset did.
2002 23rd International Conference on Microelectronics. Proceedings (Cat. No.02TH8595)
We reported a new operating principle of ferroelectric gate FET memory. With an intermediate elec... more We reported a new operating principle of ferroelectric gate FET memory. With an intermediate electrode inserted between a ferroelectric capacitor and a MIS-FET, the memory is potential to solve problems of short retention time, high operation voltage and instability performance of conventional ferroelectric gate FET memory. The memory was experimentally and theoretically investigated and was verified to be practicable.
Wireless Communications and Mobile Computing, 2008
In multi‐carrier CDMA cellular systems, hotspot communication can be established to support the h... more In multi‐carrier CDMA cellular systems, hotspot communication can be established to support the high‐traffic areas by using the same frequency band of the original cellular systems. However, interference from the hotspots deteriorates the communication performance of the original cellular system. In this paper, in order to decrease the interference, we set up the access point (AP) of hotspots with the adaptive array antenna and code assignment method between the cellular and the hotspot communication is considered. In the proposed system, OFDM hotspot communication is overlapped to the uplink of MC/DS‐CDMA cellular system in the same frequency band and the beam‐forming method is applied to eliminate inter‐system interference. Moreover, by allocating orthogonal variable spreading factors (OVSF) code to the both hotspot users and cellular users in the hotspot uplink period, the orthogonality of each user is kept. As a result, we can embed many hotspots into the cellular system with ve...
Thalassas: An International Journal of Marine Sciences, 2019
Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high ... more Scylla paramamosain have been considered as an economic candidate for aquaculture, however, high mortality during early larval stages exhibits a significant bottleneck to their mass seed production. Operational enzymatic variables were investigated for further studies on feeding optimization. Ontogenetic change of the digestive system of S. paramamosain was enzymatically (trypsin, chymotrypsin, pepsin, amylase and alkaline phosphatase) evaluated. Results showed that these enzymes were already presented in the larvae before exogenous feeding. The first detection after hatching was low activity and gradually increased from Z3 except trypsin, and chymotrypsin activity increased from Z5 stage. Alkaline phosphatase activity peaked at Z2 and Z4, followed by a sharp fall in Z5 and megalope. Trypsin and Chymotrypsin activities were also decreased from Z3 to Z5, then sharply increased from Z5; however, Chymotrypsin activity decreased after megalope stage. Pepsin activity was detectable after hatching and regularly increased through the larval development. Amylase activity was low from hatching to Z3 and then suddenly increased. Alkaline phosphatase activity was recorded with the highest activity at Z2 and Z4, then complex variation, particularly at Z3 and megalope stage. The study constitutes physiological information on ontogenic development as well as the digestive abilities of mud crab larvae further, facilitates feeding diet formulation and larviculture of this species.
Thin Solid Films, 2002
We investigated the crystalline quality and resistivity of an epitaxial Ir film deposited on an e... more We investigated the crystalline quality and resistivity of an epitaxial Ir film deposited on an epitaxial (1 0 0)YSZy(1 0 0)Si substrate by RF magnetron sputtering method. It has been reported that the orientation of Ir film deposited on YSZ film depends on the deposition rate. In our case, the surface of the YSZySi structure was cleaned by diluted HF solution, just before loading the sample to the sputtering chamber. It was found that even when the sputtering gas pressure was increased to 15 Pa and the deposition rate from 0.5 to 60 nmymin, respectively, the Ir film was still epitaxially grown with a high (1 0 0) orientation. This is because the diluted HF solution treatment cleaned off the YSZySi surface. When the deposition rate was increased, the crystalline quality and resistivity of the film were decreased and increased, respectively.
Aquaculture Research, 2019
The marine finfish culture in Malaysia has been promoted and has become an important engine of na... more The marine finfish culture in Malaysia has been promoted and has become an important engine of national aquaculture production (Yusoff, 2015). Among marine fish seabass, Asian seabass (Lates calcarifer) cage farm is becoming more popular due to its economic advantages (FAO, 2015; Yap et al., 2005). L. calcarifer is a carnivorous euryhaline fish cultured both in ponds or floating cages throughout the year, hence it is considered as a good candidate for aquaculture