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A Design Configuration of an FPGA-Based Coincident Spectrometry System

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第3期3卷 158-162页

作者： Pham Dinh Khang nguyen Nhi Dien Dang Lanh nguyen Xuan Hai Pham Ngoc tuan nguyen Duc Hoa nguyen An Son Nuclear Research Institute Dalat Vietnam Nuclear Training Center Hanoi Vietnam University of Dalat Dalat Vietnam University of Dalat Dalat Vietnam.

In the past, most of popular coincidence spectrometers were normally based on traditional electronics techniques such as time to amplitude conversion or logic selecting coincidence unit. They were complicated and it is not convenient for us to use them. This paper deals with a new design of a contemporary coincidence spectrometer which is based on Field Programmable Gate Arrays (FPGA) devices via Digital Signal Processing (DSP) techniques with Hardware Description Language (VHDL). The outstanding advantage of DSP techniques and FPGA technology is capable of enhancement of the quality of the experimental measurements for nuclear radiation. The designed configuration of the traditional system was tested on the PCI 7811R board of National Instruments while the digital systems were establishing with FPGA devices. The purpose of this work is referring to the principle for construction of an FPGA-based system capable of replacing a conventional system. Therefore, a novel approach for in-house development of digital techniques is presented. The method for designing the system is utilization of slow-fast coincidence configurations with two HPGe detectors obtaining a pair of coincidence events, processing data in DSP algorithms. The significant and noticeable results are the operating frequency of 80 MHz and system timestamp window of approximately 10 ns.

关键词： Digital Signal Processing FPGA VHDL

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捐赠母乳的使用

英国医学杂志中文版 2022年第3期25卷 169-171页

作者： Hoang Thi Tran tuan T nguyen Roger Mathisen 熊祎(译) 杜忠东(校) Da Nang Hospital for Women and Children Da NangVietnam Alive&Thrive Southeast Asia FHI 360HanoiVietnam 首都儿科研究所首都医科大学附属北京儿童医院

在越南中部的大南妇女儿童医院,一名25岁的初产妇孕27周诞下一男婴。这名男婴出生体重仅980 g,他住在新生儿重症监护室,需要进行持续的气道正压通气支持。新生儿重症监护室的护士向她提供母乳喂养宣教和相关支持,出生后前4天,她的宝宝... 详细信息

在越南中部的大南妇女儿童医院,一名25岁的初产妇孕27周诞下一男婴。这名男婴出生体重仅980 g,他住在新生儿重症监护室,需要进行持续的气道正压通气支持。新生儿重症监护室的护士向她提供母乳喂养宣教和相关支持,出生后前4天,她的宝宝接受她自己的母乳以及巴氏灭菌的捐赠母乳。从生后5天起,她已经可以分泌足够的母乳以满足孩子的生理需要。

关键词：新生儿重症监护室妇女儿童医院气道正压通气初产妇捐赠母乳巴氏灭菌出生体重生理需要

Reporting cervical effacement as a percentage: How accurate is it?

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Open Journal of Obstetrics and Gynecology 2013年第7期3卷 569-572页

作者： Radha Malapati Yen N. Vuong tuan M. nguyen Department of Obstetrics and Gynecology Division of Maternal-Fetal Medicine John H. Stroger Hospital Chicago USA

Objective: To evaluate the accuracy of cervical effacement reported as a percentage by digital cervical exams using cervical length determined by transvaginal ultrasonography as a standard. Methods: Records of pregnant women who had a digital cervical exam and subsequent transvaginal ultrasound scan for cervical length between January 2005 and December 2008 were reviewed. Digital cervical exams were performed by different examiners. Transvaginal ultrasound was performed by one examiner who did not perform any of the digital exams. Cervical effacements were recorded as a percentage and cervical lengths were measured in centimeters. Results: A total of 173 women met the study criteria. Average cervical length for 0% effacement was 3.3 ± 1.1 cm (0.8 - 5.0 cm);20% effacement, 1.6 ± 1.0 cm (0.9 - 3.0 cm);25% effacement, 2.2 ± 0.2 cm (2.0 - 2.3 cm);30% effacement, 2.6 ± 0.4 cm (2.1 - 3.0 cm);40% effacement, 3.0 ± 0.4 cm (2.6 - 3.4 cm);50% effacement, 2.4 ± 1.1 cm (0.6 - 4.6 cm);60% effacement, 2.3 ± 1.4 cm (0.7 - 4.3 cm);70% effacement, 2.2 ± 0.8 cm (1.1 - 3.3 cm);75% effacement, 1.7 ± 1.4 cm (0.7 - 2.7 cm);80% effacement, 2.0 ± 0.9 cm (0.6 - 4.4 cm);90% effacement, 0.7 ± 0.4 cm (0.4 - 0.9 cm);100% effacement, 1.2 ± 1.5 cm (0.3 - 3.0 cm). The coefficient of variation ranges from 10% - 124%. Conclusion: The traditional method of reporting cervical effacement as a percentage is unacceptably inaccurate compared to the actual cervical length determined by vaginal probe ultrasound.

关键词： Cervical Effacement Cervical Length Transvaginal Ultrasound

Evaluation of the calibration factors of neutron dose rate meters in a 241Am–Be neutron field

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Nuclear Science and Techniques 2019年第9期30卷 18-23页

作者： Thiem Ngoc Le Sy Minh tuan Hoang Quynh Ngoc nguyen Hoai-Nam Tran Institute for Nuclear Science and Technology VINATOM 179 Hoang Quoc Viet Hanoi Vietnam Institute of Fundamental and Applied Sciences Duy Tan University Ho Chi Minh City Vietnam

Calibrations were performed for three types of neutron ambient dose equivalent rate meters, i.e., Aloka TPS-451C (Hitachi), KSAR1U.06 (Baltic Scientific Instruments), and Model 12-4 (Ludlum), using a standard field of a 241Am–Be source. The measured total neutron ambient dose equivalent rates, H*(10)' tot, were analyzed to obtain the direct neutron ambient dose equivalent rates, H*(10)' dir, using the ISO 8529-2-recommended generalized- fit method, semiempirical fit method, and reducedfitting method (RFM) fit methods. The calibration factor (CF), defined as the ratio between the conventional true value of the neutron ambient dose equivalent rates in a free field, H*(10)' FF, and H*(10)' dir, was evaluated as one of the important characteristics of the neutron meters in the present work. The fitting results show that the H*(10)' dir values of the meters are in good agreement within the theoretical data within 4%. The averaged CFs of the three neutron meters were evaluated as 0:99 ± 0:01, 1:00 ± 0.03;and 0:99 ± 0:08, respectively. The largest standard uncertainty of these values was determined to be approximately 18.47%(k =1). The standard uncertainty of the CFs obtained using the RFM method was less than 4.23%(k=1), which is the smallest uncertainty among the three methods.

关键词： Neutron meter Calibration factor ^241 Am–Be source

Effects of Placental Transfusion by Delayed Cord Clamping or Umbilical Cord Milking versus Immediate Cord Clamping on Neonatal Outcomes in Very Low Birth Weight Neonates

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Open Journal of Obstetrics and Gynecology 2018年第11期8卷 1032-1039页

作者： Swosti Joshi Mopelola Akintorin Alison Wiles Annamarie Arias Louis Fogg tuan nguyen Division of Neonatology John H Stroger Hospital of Cook County Chicago IL USA Department of Pediatrics John H Stroger Hospital of Cook County Chicago IL USA Chicago Medical School at Rosalind Franklin University of Medical Sciences Chicago IL USA Division of Statistics Rush University Medical Center Chicago IL USA Department of Obstetrics and Gynecology John H Stroger Hospital of Cook County Chicago IL USA

Background: Delayed cord clamping (DCC) and umbilical cord milking (UCM) are two recently advocated interventions to enhance placental transfusion at birth. DCC and MCM might increase blood volume and help neonates to transition from fetal to neonatal circulation. Objective: To evaluate the effects of delayed cord clamping (DCC), umbilical cord milking (UCM), and immediate cord clamping (ICC) on very low birth weight (VLBW) neonates. Methods: At our institution, ICC was routinely done until December, 2012 when it was replaced by DCC. UCM was implemented in March, 2015. Neonatal outcomes were compared among ICC, DCC, and UCM. Results: A total of 94 neonates met inclusion criteria. Comparing with ICC neonates, DCC and UCM neonates had higher hematocrits, fewer blood transfusions, and lower incidence of chronic lung disease at 36 completed weeks of gestation. All groups were similar in APGAR scores, vasopressor use, intraventricular hemorrhage (IVH) and necrotizing enterocolitis (NEC). Conclusion: Compared to ICC, DCC and UCM appear to be more beneficial to VLBW neonates without apparent adverse risks.

关键词： Delayed Cord Clamping Umbilical Cord Milking Very Low Birth Weight Placental Transfusion

High-performance polarization-sensitive photodetectors on two-dimensional β-InSe

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National Science Review 2022年第5期9卷 30-36页

作者： Zhinan Guo Rui Cao Huide Wang Xi Zhang Fanxu Meng Xue Chen Siyan Gao David K.Sang Thi Huong nguyen Anh tuan Duong Jinlai Zhao Yu-Jia Zeng Sunglae Cho Bing Zhao Ping-Heng Tan Han Zhang Dianyuan Fan Institute of Microscale Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology College of Physics and Optoelectronic EngineeringShenzhen University Institute of Nanosurface Science and Engineering Guangdong Provincial Key Laboratory of MicroNano Optomechatronics EngineeringShenzhen University State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of Sciences Department of Physics and Energy Harvest-Storage Research Center University of Ulsan State Key Laboratory of Supramolecular Structure and Materials Jilin University

Two-dimensional(2D) indium selenide(InSe) has been widely studied for application in transistors and photodetectors,which benefit from its excellent optoelectronic *** the three specific polytypes(γ-,ε-and β-phase) of InSe,only the crystal lattice of InSe in β-phase(β-InSe) belongs to a non-symmetry point group of D6 h~4,which indicates stronger anisotropic transport behavior and potential in the polarized photodetection of β-InSe-based optoelectronic ***,we prepare the stable p-type 2D-layered β-InSe via temperature gradient *** anisotropic Raman,transport and photoresponse properties of β-InSe have been experimentally and theoretically proven,showing that theβ-InSe-based device has a ratio of 3.76 for the maximum to minimum dark current at two orthogonal orientations and a high photocurrent anisotropic ratio of 0.70 at 1 V bias voltage,*** appealing anisotropic properties demonstrated in this work clearly identify β-InSe as a competitive candidate for filter-free polarization-sensitive photodetectors.

关键词： 2D materials polarization photodetectors β-InSe Raman spectra

The Basis for Design and Manufacture of a DSP-Based Coincidence Spectrometer

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Journal of Analytical Sciences, Methods and Instrumentation 2013年第3期3卷 152-157页

作者： nguyen Xuan Hai Pham Ngoc tuan nguyen Nhi Dien Dang Lanh Tuong Thi Thu Huong Pham Dinh Khang Nuclear Research Institute Dalat Vietnam Nuclear Research Institute Dalat Vietnam 2Nuclear Training Center Hanoi Vietnam Nuclear Research Institute Dalat Vietnam 2Nuclear Training Center Hanoi Vietnam. Nuclear Training Center Hanoi Vietnam

The coincidence technique and the coincidence spectroscopy have been developed and applied for over 40 years. Most of popular coincidence measurement systems were based on analog electronics techniques such as time to amplitude conversion (TAC) or logic selecting coincidence unit. The above-mentioned systems are relatively cumbersome and complicated to use. With the strong growth of digital electronics techniques and computational science, the coincidence measurement systems will be constructed simpler but more efficient with the sake of application. This article presents the design principle and signal processing of a simple two-channel coincidence system by a technique of digital signal processing (DSP) using Field Programmable Gate Arrays (FPGA) devices at Nuclear Research Institute (NRI), Dalat.

关键词： Coincidence Spectrometer Digital Signal Processing FPGA

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越南农业发展模式及未来展望

中国乡村发现 2010年第3期 147-150页

作者： tuan nguyen 越南农业部农村政策研究中心

越南和中国是近邻,在发展模式上和中国有很多相似之处。在过去的20年里,中国和越南都经历了快速的经济发展,而且越南现在也已经达到了中等收入陷阱的时期,未来需要面临的问题不仅是农工之间的关系、城乡之间的关系,还有国家和外部世界... 详细信息

越南和中国是近邻,在发展模式上和中国有很多相似之处。在过去的20年里,中国和越南都经历了快速的经济发展,而且越南现在也已经达到了中等收入陷阱的时期,未来需要面临的问题不仅是农工之间的关系、城乡之间的关系,还有国家和外部世界的关系。

关键词：城乡之间发展模式关系越南中国

An ecohealth assessment of poultry production clusters (PPCs) for the livelihood and biosecurity improvement of small poultry producers in Asia

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Infectious Diseases of Poverty 2015年第1期4卷 49-57页

作者： Libin Wang Edi Basuno tuan nguyen Worapol Aengwanich Nyak Ilham Xiaoyun Li College of Humanities and Development Studies China Agricultural UniversityQinghua Donglu 17Beijing 100083China Indonesian Center for Agriculture Socio Economic and Policy Studies J1 Ahmad Yani 7016161 BogorIndonesia Center for Agricultural Policy Institute of Policy and Strategy for Agriculture and Rural DevelopmentHanoiVietnam Faculty of Veterinary Sciences Mahasarakham UniversityMaha Sarakham 440000Thailand

Background:Poultry production cluster(PPC)programs are key strategies in many Asian countries to engage small commercial poultry producers in high-value production chains and to control infectious poultry *** study assessed the multiple impacts of PPCs through a transdisciplinary ecohealth approach in four Asian countries,and drew the implications for small producers to improve their livelihoods and reduce the risk of spreading infectious diseases in the poultry ***:The data collection combined both quantitative and qualitative *** comprised:formal structured household survey questionnaires,measuring the biosecurity level of poultry farms with a biosecurity score card;and key informant *** statistics were used to process the quantitative data and a content analysis was used to process the qualitative ***:This research found that poultry farms in clusters do not necessarily have better economic performance than those outside *** farmers in PPCs only consider them to be an advantage for expanding the scale of their poultry operations and improving household incomes,and they are less concerned about-and have limited capacities to-enhancing biosecurity and environmental *** measured the biosecurity level of farms in PPCs through a 14-item checklist and found that biosecurity is generally very low across all sample *** increased flies,mosquitoes,rats,and smells in and around PPCs not only pollute the environment,but also cause social conflicts with the surrounding ***:This research concluded that a poultry cluster,mainly driven by economic objectives,is not necessarily a superior model for the control of infectious *** level of biosecurity in PPCs was found to be *** the intensity of poultry operations in PPCs(farms are densely packed into clusters),and the close proximity to residential areas of some PPCs,the risk of spreading infectious diseases,in fact,incre

关键词： Poultry production cluster(PPC) Small producers Biosecurity Infectious diseases Livelihood Ecohealth