128 research outputs found
Zeta study of water samples on Ba and Dong Nai river basins
No full textFindings zeta potential in river water samples of Ba and Dong Nai basin in Tay Nguyen area indicated that the properties of colloidal systems in the basin of Ba and Dong Nai river in Tay Nguyen region was relatively stable. The colloidal system was heavily influenced by the pH of the water, not by suspended component. The study also showed the influence of pH value on zeta potential values in river water samples. For the three river water samples, pH values tend to be inversely proportional to the zeta potential. Meanwhile, it is only true for the water samples taken in the middle section and the downstream of Dong Nai river basin, but upstream tended to be directly proportional. In addition, zeta potential in water samples at the regional hydroelectric plant located on 2 river basins, especially water sampled before and after the dams were also studied. The obtained results showed that affects of pH index on the zeta potential values are completely correct and were a good agreement with discovered rules.ReferencesLại Huy Anh và nnk, 2004: Nghiên cứu cấu trúc địa hình, địa mạo, địa động lực lưu vực sông Ba và sông Côn. Báo cáo chuyên đề Viện Địa lý, Hà Nội. Đỗ Đức Dũng, Nguyễn Vũ Huy, 2012: Báo cáo tình hình quản lí lưu vực sông Đồng Nai 2011, Đỗ Tiến Lanh, 2010: Báo cáo đề tài KC08 18/06-10 “Quản lý tổng hợp lưu vực và sử dụng hợp lí tài nguyên nước lưu vực hệ thống sông Đồng Nai”. Lưu trữ tại viện Khoa học Thủy lợi miền Nam. Ngô Đình Tuấn và nnk, 2007: Quản lý tổng hợp tài nguyên nước lưu vực sông Ba, Trường Đại học Thủy lợi, Hà Nội. Nguyễn Viết Phổ, 1999: Tìm hiểu sông Đồng Nai. Hội nghị khoa học, công nghệ và môi trường miền Đông Nam Bộ họp tại Đà Lạt 12/1999, http://dalat.gov.vn Nguyễn Viết Phổ, 2003: Tài nguyên nước Việt Nam, Nhà xuất bản Nông Nghiệp, trang 137-152. Tran Hong Thai, Tran Thi Van, 2011: Assessment of climate change impacts on salinity intrusion in Hong-Thai Binh and Dong Nai river basins, VNU Journal of Science, Earth Sciences 27, 54-61. Zeta Meter 4.0 Instructor, Zeta-Meter Inc., PO Box 3008, Staunton VA 24402 USA. 2009. Cổng thông tin quan tắc môi trường, Lưu vực sông Đồng Nai, http://www.cem.gov.vn, 01/03/2011.
Petrography and geochemistry of Permian basalts of the Cam Thuy formation and their relation to Song Da and Emeishan magmatic rocks
No full textCam Thuy Permian basalts consisting of thick lava flows and pyroclastic layers appear along both sides of the Song Ma fault zone in Thanh Hoa and in Son La and Ninh Binh provinces, NW Vietnam. The magmatism has been thought to have genetic relationship with Permian volcanism in the Song Da rift zone, which is believed to be part of the Emeishan large igneous province, having been extruded along the Red River shear zone following Paleogene India-Eurasian collision. A set of Cam Thuy volcanic samples including olivine and alkaline basalts was collected in the Lam Son area (Tho Xuan, Thanh Hoa province) to analyze for geochemical major, trace element and Sr-Nd-Pb isotopic composition. The Cam Thuy basalts are high-TiO2, CaO, FeO*, moderate MgO and SiO2 that plot between the Song Da and Emeishan high- and low-Ti basalt distribution fields and closely overlap that of Song Da’s high-Ti field. The primitive mantle and chondrite normalized trace element patterns of Cam Thuy basalts are essentially enriched oceanic island basalt (OIB)-like; this feature, together with crustal contamination-free, chondritic Sr, Nd and Pb initial (255Ma) isotopic composition are certainly of asthenospheric origin. These geochemical and isotopic characteristics are closely analogous to those features observed for the Song Da high-Ti basalts, suggesting similarity in their source of origin. Nevertheless, while the Song Da (and Emeishan) magmatism is signified by the presence of both high- and low-Ti basalts, with the latter being derived from heterogeneous and partially crustal-material contaminated sources in the lithospheric mantle, this low-Ti volcanic rock type has yet to be discovered in the Cam Thuy formation.ReferencesAnders, E., Grevesse, N., 1989. Abundances of the elements: meteorite and solar. 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Assessment of Physicochemical Characteristics of Surface Water in the Full-Dyke and Semi-Dyke Systems: A Case Study
No full textThe present study aimed to assess the physicochemical characteristics of surface water in the full-dyke (FD) and semi-dyke (SD) systems of the An Giang province. Water samples were collected in both seasons in 2019 (1) the first monitoring phase in the dry season (April) and (2) the second monitoring phase in the rainy season (October). At each season, the surface water samples were collected at 15 sites in the FD system and 15 sites in the SD system to analyze the water quality parameters. The results showed that the concentrations of DO, COD, BOD, TSS, NO3-, NH4+, TKN, PO43- and TP parameters in the FD system were higher than in the SD system and there was a significant difference (p<0.05), except the value of pH and DO in the dry season. The DO, COD, BOD5 and TSS concentrations in the FD system tended to exceed the Vietnamese standard threshold (QCVN 08:2015/BTNMT, column B1), but in the SD system, these values were within the allowable limits of Vietnamese Standard. Other parameters, such as NO3-, NH4+, TKN, PO43- and TP exceeded the threshold of the Vietnamese standard in both systems. The results of this study provide the scientific information on water pollution inside the FD system. Therefore, it was expected that the local government of the An Giang province should have long-term strategies to manage the FD system to improve the water quality inside the FD system
Monitoring Truck Cranes Operation with the Safety Management System on Construction Sites
No full textIn the era of construction digitization, automating construction site management is becoming increasingly feasible by integrating site management systems with on-site facilities and equipment. For mobile cranes, including truck cranes operating at construction sites, safety is a critical concern alongside operational management and productivity. The high susceptibility of truck cranes to unsafe conditions, such as excessive vibrations during operation, underscores the importance of addressing these risks.
This article presents a research model focused on managing the vibration and tilt levels of truck cranes as part of the broader occupational safety challenges at construction sites. The study employs the finite element method to develop a structural model and applies analytical techniques to construct a continuous-discrete model of the crane, simulating unsafe conditions during operation.
The research further proposes a framework for monitoring crane operations with a safety focus, utilizing sensors and a safety controller device. These components communicate with the on-site safety management system to exchange real-time data, issue safety alerts, and generate warnings. Future studies aim to validate these findings by testing the crane element models and the proposed framework in practical, real-world scenarios
Exhaled Nitric Oxide as a Surrogate Marker for Obstructive Sleep Apnea Severity Grading: An In-Hospital Population Study
No full textKhue Dang-Thi-Mai,1 Nhat-Nam Le-Dong,2 Vu Le-Thuong,1 Ngoc Tran-Van,1 Sy Duong-Quy3,4 1Department of Respiratory Diseases, Cho Ray Hospital, Ho Chi Minh City, Vietnam; 2Department of Technology, Sunrise, Namur, Belgium; 3Bio-Medical Research Centre, Lam Dong Medical College, Dalat, Vietnam; 4Penn State Medical College, Hershey Medical Center, Hershey, PA, USACorrespondence: Sy Duong-QuyBio-Medical Research Centre, Lam Dong Medical College, 16 Ngo Quyen, Dalat, VietnamTel +84 918413813Fax +84 2633815000Email [email protected]: Our study aimed to evaluate the relationship between exhaled nitric oxide (eNO) markers and obstructive sleep apnea (OSA) severity and verify the changes in eNO profiles among mild, moderate, and severe OSA subgroups.Methods: This study was a cross-sectional and in-hospital population-based study. We investigated 123 OSA patients (17 mild, 23 moderate and, 83 severe OSA) in the department of respiratory diseases. Studied data included anthropometry, respiratory polygraphy, biological markers, spirometry, and multi-flow eNO measurements. Data analysis implied linear correlation, non-parametric ANOVA, and pair-wise comparison.Results: No significant difference could be found among 3 OSA severity subgroups for FENO at – four sampling flow rates (50– 350 mL/s). The bronchial production rate of NO (J’awNO) was proportionally increased, with median values of 11.2, 33.9, and 36.2 in mild, moderate, and severe OSA, respectively (p=0.010). The alveolar concentration of NO (CANO) changed with a non-linear pattern; it was increased in moderate (6.49) vs mild (7.79) OSA but decreased in severe OSA (5.20, p = 0.015). The only correction that could be established between OSA severity and exhaled nitric oxide markers is through J’AWNO (rho=0.25, p=0.02) and CANO (rho= 0.18, p=0.04). There was no significant correlation between FENO measured at three different flow rates and the OSA severity. We also found a weak but significant correlation between FENO 100 and averaged SpO2 (rho = 0.07, p= 0.03).Conclusion: The present study showed that J’AWNO, which represents eNO derived from the central airway, is proportionally increased in more severe OSA, while eNO from alveolar space, indicated by CANO, was also associated with OSA severity and relatively lower in the most severe OSA patients. In contrast, stand-alone FENO metrics did not show a clear difference among the three severity subgroups.Keywords: exhaled nitric oxide, FENO, J’AWNO, CANO, obstructive sleep apne
Enhancing renewable energy production from water hyacinth (Eichhornia crassipes) by a biogas-aerating recirculation system: A case study in the Vietnamese Mekong Delta
No full textThe study aims to examine biogas-aerating recirculation on biomethanation in a farm-scale digester with water hyacinth substrate. The experiment was conducted with the difference in biogas-aerating times and frequencies. Methane yield considerably improved by 27.44–52.12%, 50.19–62.30% and 63.11−71.46% for aerating biogas from 15 to 60 minutes at once, twice and four-time d−1, respectively. Maximum biogas yields were estimated for biogas-aerating at once, twice, and four daily repetitions at 47.8, 78.0, and 145 minutes. Biogas-aerating 30 minutes at twice d−1 and 15–60 minutes at four-time d−1 displayed great potential for biogas production augmentation
Effects of Chlorpyrifos Ethyl on Cholinesterase and Growth of Silver Barb (Barbonymus gonionotus)
No full textChlorpyrifos ethyl is a popular insecticide widely used in agriculture within the Vietnamese Mekong delta, including for rice farming. Here, local farmers often apply pesticides at very high rates which leads to contamination of the surrounding environment. Silver barb (Barbonymus gonionotus) is a fish species indigenous to the delta, which resides in a variety of water bodies and is also commonly cultivated in rice–fish systems. As a result, this species is at high risk of exposure to chlorpyrifos ethyl. This study aims to determine the lethal concentration (LC50) of chlorpyrifos ethyl, as well as the effects of sub-lethal concentrations on the activity of cholinesterase and growth of Silver barb. Lethal concentration testing was conducted in a static non-renewed system. Three concentrations of chlorpyrifos ethyl (1%, 10% and 20% LC50-96 h) were conducted in triplicate to assess the effects of chlorpyrifos ethyl on the brain cholinesterase (ChE) of fingerling fish for 15 days, and on their growth for 60 days. Results showed that chlorpyrifos ethyl was highly toxic to fingerling Silver barb with a LC50-96 h of 0.119 ppm. The lowest observed effect concentration (LOEC) was 1%LC50-96 h for ChE and 10%LC50-96 h for growth. No observed effect concentration (NOEC) of chlorpyrifos ethyl for growth was 1%LC50-96 h. The result from this study suggests that ChE activity is significantly inhibited at environmentally realistic concentrations in the Vietnamese Mekong delta and can be used as a biomarker of pesticide exposure. Further study in the rice fields as well as in the canals or rivers is required
A High-Throughput Hardware Implementation of NAT Traversal For IPSEC VPN
No full textIn this paper, we present a high-throughput FPGA implementation of IPSec core. The core supports both NAT and non-NAT mode and can be used in high speed security gateway devices. Although IPSec ESP is very computing intensive for its cryptography process, our implementation shows that it can achieve high throughput and low lantency. The system is realized on the Zynq XC7Z045 from Xilinx and was verified and tested in practice. Results show that the design can gives a peak throughput of 5.721 Gbps for the IPSec ESP tunnel mode in NAT mode and 7.753 Gbps in non-NAT mode using one single AES encrypt core. We also compare the performance of the core when running in other mode of encryption
Role of surface charge and oxidative stress in cytotoxicity of organic monolayer-coated silicon nanoparticles towards macrophage NR8383 cells
No full textBackground - Surface charge and oxidative stress are often hypothesized to be important factors in cytotoxicity of nanoparticles. However, the role of these factors is not well understood. Hence, the aim of this study was to systematically investigate the role of surface charge, oxidative stress and possible involvement of mitochondria in the production of intracellular reactive oxygen species (ROS) upon exposure of rat macrophage NR8383 cells to silicon nanoparticles. For this aim highly monodisperse (size 1.6 ± 0.2 nm) and well-characterized Si core nanoparticles (Si NP) were used with a surface charge that depends on the specific covalently bound organic monolayers: positively charged Si NP-NH2, neutral Si NP-N3 and negatively charged Si NP-COOH. Results - Positively charged Si NP-NH2 proved to be more cytotoxic in terms of reducing mitochondrial metabolic activity and effects on phagocytosis than neutral Si NP-N3, while negatively charged Si NP-COOH showed very little or no cytotoxicity. Si NP-NH2 produced the highest level of intracellular ROS, followed by Si NP-N3 and Si NP-COOH; the latter did not induce any intracellular ROS production. A similar trend in ROS production was observed in incubations with an isolated mitochondrial fraction from rat liver tissue in the presence of Si NP. Finally, vitamin E and vitamin C induced protection against the cytotoxicity of the Si NP-NH2 and Si NP-N3, corroborating the role of oxidative stress in the mechanism underlying the cytotoxicity of these Si NP. Conclusion - Surface charge of Si-core nanoparticles plays an important role in determining their cytotoxicity. Production of intracellular ROS, with probable involvement of mitochondria, is an important mechanism for this cytotoxicit
BIM Related Technology Enabled Facility Management for Buildings: Challenges and Potential Research Directions
No full textThe operation and maintenance phases of the buildings, featured by great time and cost consumption, always contain a variety of complex issues, risks and uncertainties, all of which significantly impact on buildings’ performance. Many cutting-edge digital technology applications are proposed to effectively manage operation and maintenance tasks, and BIM and BIM-related technologies (such as iBMS, sensors and IoT) stand out as the best options because of their advantages for the information management process. In this research, a literature review on the application of BIM and BIM-related technologies for facilities management was conducted in order to measure the challenges of such technologies’ application and potential research directions toward the topic. The results pointed out a number of issues in terms of BIM enabled facilities management, then discussed on challenges and potential research directions on the BIM-FM system for building sector, including: (1) improving and managing data input quality, (2) identifying frameworks and processes for transferring data between BIM and existing operation management systems with the aid of advanced technologies, and (3) developing completely automated BIM enabled facilities management for the goals of automation and sustainable development
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