Duy Chinh Nguyen

Southern California Coastal Water Research Project

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Long Giang Bạch

Trường ĐH Nguyễn Tất Thành

Trinh Duy Nguyen

Pukyong National University

Dai‐Viet N. Vo

Trường ĐH Nguyễn Tất Thành

Dai Hai Nguyen

Vietnam Academy of Science and Technology

Tri Duc Lam

Trường ĐH Nguyễn Tất Thành

Thien Hien Tran

Trường ĐH Nguyễn Tất Thành

Trần Quốc Toàn

Vietnam Academy of Science and Technology

Le Thi Hong Nhan

Ho Chi Minh City University of Technology

Mark Meyer

University of Central Florida

Farid Gharagozloo

Florida College

Cooperative Institutions

Trường ĐH Nguyễn Tất Thành

Vietnam Academy of Science and Technology

Vietnam National University Ho Chi Minh City

Ho Chi Minh City University of Technology

Nong Lam University Ho Chi Minh City

Tân Tạo University

Hanoi University of Science and Technology

Thai Nguyen University

Methodist Hospital

Merrill (United States)

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Extraction Process of Essential Oil from Plectranthus amboinicus Using Microwave-Assisted Hydrodistillation and Evaluation of It’s Antibacterial Activity

Asian Journal of Chemistry (2018)

Tan Phat Dao Duy Chinh Nguyen Trinh Duy Nguyen Thien Hien Tran Phu Thuong Nhan Nguyen

Plectranthus amboinicus oil has many applications in pharmaceutical, medicine and cosmetic industries. Recently, new methods of extracting essential oil used have been increasingly developed to replace traditional methods. In this study, maximization of essential oils yield from P. amboinicus was studied by the combination of microwave assisted hydro-distillation (MAHD) and response surface methodology (RSM). We found that that the maximum essential oil yield was 0.1374 % with 94.38 % reliability and influencing factors such as microwave power for this process was 515 W, raw material to water ratio 1.64:1, extraction time at 100.8 min. ANOVA analysis for quadratic model also gives favourable outcome including the high determination coefficient (R2 = 0.94), significant F-value and p-value of coefficients. Under laboratory condition, the obtained yield (0.1374 %) approximated the yield predicted by the quadratic model, suggesting the reasonable soundness of the employed model and RSM when it comes to optimizing the parameters of extraction. In addition, considerable antibacterial activities of extracted essential oil against four bacteria cultures, in particular, S. aureus was recognized.

Quadratic model

Eucalyptus oil

Microwave power

10.14233/ajchem.2019.21667

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Citations (46)

Response surface modeling and optimizing conditions for anthocyanins extraction from purple sweet potato (Ipomoea batatas (L.) Lam) grown in Lam Dong province, Vietnam

IOP Conference Series Materials Science and Engineering (2019)

Tri Nhut Pham Bui Phuc Tran Thien Hien Tran Duy Chinh Nguyen Thi-Phuong-Tu Nguyen

Anthocyanin is increasingly used as a natural and safe coloring agent. In this paper, the extraction of purple sweet potato anthocyanin (PSPAs) was investigated by using response surface methodology (RSM). Different extraction temperatures of solvent ethanol (60 – 70 °C), duration of extraction (35 - 45 min) and solid-liquid ratios (4:1 - 6:1) were selected in order to extract PSPAs. The highest anthocyanin content of 206.019 mg/L of PSPAs was collected at the solid liquid ratio 6:1, extraction time 39.61 min, and temperature 67.38°C. PSPAs yield detailed significant correlation with high F values, low P values (<0.0001), the determination coefficient (R2=0.9986) and a high desirability 93.5%.

Ipomoea

10.1088/1757-899x/479/1/012012

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Citations (11)

Advanced Production Technologies for High Performance FML Parts

Hakan Uçan Duy Chinh Nguyen Christian Krombholz Dorothea Nieberl Deniz Nick Akin

Due to the low density and almost unrestricted design possibilities of a laminate, the use of glass-fiber-reinforced aluminum allows a significant weight reduction compared to a conventional fuselage made of monolithic aluminum materials. The innovation to be expected consists the development of a construction for very thin metal laminates, that have on the one hand a skin thickness which is about 50% lower than that of the prior art used in A380, and which has at the same time a significantly greater performance in terms of fatigue, damage tolerance and impact behavior compared to conventional aluminum components. On this basis, the aim in various research projects is to develop and validate a fuselage concept based on the FML technology with the objectives of a significant weight reduction of the aircraft structure (approx. 400 kg) and constant manufacturing costs (RC) compared to the state of the art. The German Aerospace Center (DLR) develops a new process chain for the production of fuselage shells at three different institutes and four locations. In addition to the advanced automation technologies of the production of metal-lamina, the research activities contain also the continuous process-accompanying quality assurance as well as a broad understanding of the material behavior. While the DLR site in Stade is processing the glass layup using AFP / ATP (ideally wrinkle-free, highly accurate and with low-waste) and the topic of the one-shot bonding, the DLR site in Augsburg is developing cooperating robots for the efficient deposition of aluminum sheets bases on the pick-and-place technology. At the DLR site in Cologne, material stresses are examined with the aim of establishing design rules under biaxial cyclic loading. The paper will include the detailed discussion of the above mentioned topics.

Fuselage

Source

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Robot Assistant Extrapleural Pneumonectomy for Mesothelioma

American Journal of Robotic Surgery (2015)

Duy Chinh Nguyen Badi Rawashdeh Mark Meyer Wali Yousufzai Mohamad Moslami

Extrapleural Pneumonectomy

10.1166/ajrs.2015.1016

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Purification Process, Physicochemical Properties, and Fatty Acid Composition of Black Soldier Fly (Hermetia illucens Linnaeus) Larvae Oil

Journal of the American Oil Chemists Society (2019)

Mai Huỳnh Cang Ngoc Duy Dao Tri Duc Lam Viet Nguyen Duy Chinh Nguyen

Abstract This study presented a refining process and reported on fatty acid composition and the physicochemical properties of the oil from black soldier fly larvae (BSFL). Crude larvae oil was purified through four steps consisting of degumming, neutralization, bleaching, and deodorization. Optimum degumming conditions that give the highest phospholipid weight and oil consisted of water concentration of 7% (v/v), followed by addition of H 2 SO 4 at a concentration of 0.5% (v/v). Optimum conditions for saponification that maximize saponification value and free fatty acid (FFA) value were 0.4 mg NaOH/100 g oil, 1 hour, and 80 °C of NaOH quantity, reaction time, and temperature, respectively. The oil was then dehydrated using 10 mg Na 2 SO 4 /g oil. The bleaching process that gives maximum oil yield consisted of activated carbon at concentration of 5% (w/w), followed by centrifugation at a speed of 5000 rpm (radius = 86 mm) for 30 min. The contents of lauric acid, linoleic acid, and linolenic acid in purified oil were 28.8%, 11.1%, and 0.4%, respectively. Physicochemical properties of the refined oil included viscosity of 96 ± 0.14 cP (measured at 20 °C), FFA value of 0.45 ± 0.017%, acid value of 0.9 ± 0.043 mg KOH g −1 , saponification value of 215.78 mg KOH g −1 , iodine value of 53.7 gI 2 /100 g, and peroxide index of 133 mEq kg −1 .

Saponification value

Saponification

Peroxide value

Hermetia illucens

10.1002/aocs.12263

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Citations (53)

Utilization of Minimally Invasive Thymectomy and Margin-Negative Resection for Early-Stage Thymoma

The Annals of Thoracic Surgery (2019)

Bryan M. Burt Duy Chinh Nguyen Shawn S. Groth Nihanth Palivela R. Taylor Ripley

Thymectomy

Margin (machine learning)

Resection margin

10.1016/j.athoracsur.2019.03.010

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Citations (30)

Isolation Process and Compound Identification of Agarwood Essential Oils from Aquilaria crassna Cultivated at Three Different Locations in Vietnam

Processes (2019)

Đinh Thị Thu Thủy Trần Thị Tuyến Trần Thị Thu Thủy Phạm Thị Hồng Minh Trần Quốc Toàn

Agarwood and agarwood essential oils are commodities with great commercial value. In Vietnam, the agarwood industry has been growing, with more than 10,000 ha of forest land reserved for the cultivation of Aquilaria crassna, an agarwood-producing tree. The aim of this study was to present a hydrodistillation process to recover agarwood essential oil and to compare chemical compositions of agarwood samples harvested from various locations in Vietnam. Three agarwood samples representing products from A. crassna trees cultivated in the provinces of Bac Giang and Khanh Hoa, and on the Phu Quoc island (Kien Giang province) of Vietnam were subjected to hydrodistillation, resulting in essential oil yields of 0.32%, 0.27%, and 0.25% (w/w), respectively. Using GC–MS analysis, a total of 44 volatile compounds were identified in the obtained oils. Most of the constituents were oxygenated sesquiterpenes and had been previously found in other agarwood oil samples. Notable compounds of other chemical classes were aromatics and fatty acids. The three oil samples showed a common volatile profile, which is characterized by the dominance of eremophilane, agarofurans, and eudesmane sesquiterpenes, while vetispirane and guaiane sesquiterpenes were found in smaller quantities. Desired compounds, such as neopetasane (7.47–8.29%), dihydrokaranone (2.63–3.59%), β-agarofuran (3.04–6.18%), and agarospirol (2.98–3.42%), were present in substantial quantities, suggesting that the essential oils could be commercialized as fragrant materials of high value.

Agarwood

Incense

10.3390/pr7070432

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Citations (35)

Modified compact fluorescent lamps improve light‐induced off‐season floral stimulation in dragon fruit farming

Food Science & Nutrition (2021)

Quang Thach Nguyen Minh Dung Ngo Thanh Hung Truong Duy Chinh Nguyen Nguyen Minh Chau

Abstract Efficient light‐induced floral stimulation plays a key role in energy conservation and maintaining stable productivity during off‐season periods of dragon fruit plants. In this study, we first reported on results of a survey on dragon fruit farmers regarding use of lamps in performing artificially induced flowering process in Vietnam. It was found that the use of incandescent lamp was prevalent in dragon fruit cultivation practices, resulting in heavy electricity consumption, and that low‐power compact fluorescent light (CFL) bulbs were not extensively utilized, possibly due to low floral induction performance of domestic CFL bulbs. Arguing that emission spectra of currently used lamps were not consistent with adsorption spectra of phytochromes, whose transformation is responsible for flowering process of dragon fruit, we then proposed three improved CFL lamps (power capacity of 20 W) having emission spectra focused on red and far‐red regions. New lamp prototypes were tested in 7 field experiments in three different provinces in Vietnam. One improved CFL bulb (treatment 2) performed relatively well in comparison with the incandescent control lamp (60 W) in six out of seven experiments with regard to some growth indicators (e.g., number of floral stems, number of bubs, number of fruits per plant) and fruit yield. Recent success on commercialization of the improved CFL lamp demonstrates the potential of CFL lamps in floral stimulating irradiation of other crops and plants and in alleviating electricity burden in dragon fruit growing areas.

Incandescent light bulb

10.1002/fsn3.2088

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Citations (4)

EVALUATING THE EFFECTIVENESS OF THE IMPLEMENTATION OF POLICY DOCUMENTS RELATED TO DISEASES PREVENTATION BY WILDLIFE PROTECTION IN PERIOD 2010 - 2020

Tạp chí Y học Việt Nam (2024)

H. N. Nguyen Duy Chinh Nguyen Ta Nguyen Thi Khuyen Tran

The project was conducted to evaluate the effectiveness of the implementation of policies on wildlife protection on the awareness and practice of party members. Within the framework of the study, 261 party members in 3 clusters were questioned with a set of quantitative questions. The results showed that policy documents were covered at a high rate in a variety of forms. However, the level of awareness and practice of the participants is not commensurate with this coverage, and there are differences between groups. 78,2% of respondents identified violations specified in policy documents related to wildlife consumption and use. The reason for not carrying out wildlife trade was chosen by 91,6% of respondents; Reasons for protecting wildlife; prevention of diseases transmitted from animals to humans; Ensuring the implementation of international commitments has 83,1% respectively; 71,3% and 65,9% identified. The rate of good practice accounted for the highest rate with 67,1%. The rates of good and bad practice were 26,8% and 6,5%, respectively. Changes in the form and method of dissemination are needed to improve the effectiveness of wildlife protection policy documents implementation.

10.51298/vmj.v544i2.11976

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Extraction conditions of Polyphenol, Flavonoid compounds with Antioxidant activity from Veronia amygdalina Del. Leaves: Modeling and optimization of the process using the response surface methodology RSM

Materials Today Proceedings (2019)

Dương Đình Chung Yen Thi Ngoc Nguyen Duc Lam Tri Quan Nguyen Huu Khanh Duy Chinh Nguyen

Vernonia amygdalina

10.1016/j.matpr.2019.07.342

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Citations (5)