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Porosity Estimation from High Resolution CT SCAN Images of Rock Samples by Using Housfield Unit

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Open Journal of Geology 2018年第10期8卷 1019-1026页

作者： Nguyen Lam Quoc Cuong Nguyen Hong Minh Hoang Manh Cuong phan Ngoc Quoc Ngo Hoang Van anh Nguyen Van Hieu Analysis Laboratory Center-Vietnam Petroleum Institute Ho Chi Minh City Vietnam

Computer Automated Tomography has been shown to be a valuable tool in production research because it provides a non-destructive method to identify and evaluate the internal structural characteristics of reservoir rock. In CT scan, Hounsfield Unit (HU) is proportional to the degree of X-ray attenuation by the tissue. The aim of the present study was to introduce the method to estimate porosity which is one of physical parameters of reservoir rock though HU data. In this study, an Image J software was used to extract Hounsfield Unit data and calibrate by standard material’s density. This method provides the ability of using CT Scanner in advanced reservoir characterization and flow test experiments.

关键词： CT Scan Hounsfield Unit Porosity

苦苣苔科凹柱苣苔属在越南的发现及水晶凹柱苣苔的补充描述

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广西植物 2020年第10期40卷 1445-1449页

作者：陆昭岑 NGUYEN Khang Sinh phan Ke Loc TRAN Thi Phuong anh 许为斌广西喀斯特植物保育和恢复生态学重点实验室广西壮族自治区中国科学院广西植物研究所中国广西桂林541006 越南科学技术研究院生态与生物资源研究所越南河内10072 越南科学技术研究院科学技术研究生院越南河内10000 越南国立大学河内科学院越南河内11416

中越边境喀斯特地区有着异乎寻常的植物多样性,已经成为全球生物多样性研究和保护的热点区域,近年来在该区发现了多个苦苣苔科植物的新种或新属。凹柱苣苔属是2010年才被建立的新属,该属的花与叶相比,花较大,叶相对较小,叶片边缘稍外卷... 详细信息

中越边境喀斯特地区有着异乎寻常的植物多样性,已经成为全球生物多样性研究和保护的热点区域,近年来在该区发现了多个苦苣苔科植物的新种或新属。凹柱苣苔属是2010年才被建立的新属,该属的花与叶相比,花较大,叶相对较小,叶片边缘稍外卷,花序仅单花,柱头盘状或凹坑状,蒴果长椭球形而有别于苦苣苔科的其他属。凹柱苣苔属为喀斯特专性植物,目前仅包括分布于黔西南的凹柱苣苔和分布于滇东南的水晶凹柱苣苔两个物种。作者在开展中越边境喀斯特地区植物多样性调查时,在越南北部的河江省发现了水晶凹柱苣苔,基于该新发现居群的植物标本,对其进行了补充描述,确认其花期为11月—12月,并对该物种濒危状况进行了重新评估,同时提供了野外生态照片以资辨认。目前,越南已记录苦苣苔科植物32属150余种,凹柱苣苔属在越南北部的发现,不仅丰富了该国苦苣苔科植物的多样性,再一次充分证明了中越边境喀斯特地区是一个完整的植物区系地理单元,而且为稀有的水晶凹柱苣苔提供了更加丰富的野外本底资料,对其将来的深入研究和保护具有重要的生物地理学和保护生物学意义。

关键词：越南植物区系石灰岩植物区系中越边境喀斯特地貌

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汉语声调与越语声调实验研究

汉语声调与越语声调实验研究

作者：潘武俊英（phan VU TUAN anh）云南师范大学

学位级别：硕士

本文对标准汉语普通话、标准越语和越南学生汉语中介语的音高进行分析研究,探索三者各自声调的音高搭配特征,重点研究标准汉语与越南学生汉语中介语静动态声调的语音特征。本文使用单音节和双音节的词语作为定量调查语料。录音对象分成... 详细信息

本文对标准汉语普通话、标准越语和越南学生汉语中介语的音高进行分析研究,探索三者各自声调的音高搭配特征,重点研究标准汉语与越南学生汉语中介语静动态声调的语音特征。本文使用单音节和双音节的词语作为定量调查语料。录音对象分成三类：讲标准普通话的中国人20位,以研究标准汉语的声调;讲标准越语的越南人20位,以研究标准越语的声调;学汉语的越南人63位,以研究越南人的汉语中介语声调。录音和调查的时间为2006年1月至2006年12月。将他们的声音录下来之后,我们用语音分析软件Speech Analyzer对录音材料进行分析和描写各种声学特征,如：基频、调形、时长、调域、起点、终点、变化速率等等。从实验语音学出发,根据对比分析法和中介语理论,我们得出以下的结果：一、对标准汉语来说,现代汉语四声的实际调值并不像教材中所说的55、35、214或51,而是44、25、313、52。在连读时它们不是固定不变,而产生出若干的变体,例：阳平2.0～4.5,上声3.0～1.5～1.5,去声5.0～2.5。二、对标准越语来说,本文重新给越语六声标上调值：横声3.0～3.0,锐声2.0～4.5,玄声2.0～1.0,问声2.5～1.0～1.5,跌声3.0～2.5～5.0,重声3.0～2.0。它们常见的动态调值分别为3.0～3.0,2.5～3.5,2.5～1.5,3.0～1.0,3.0～3.0～5.0,3.0～2.0。三、对越南学生汉语中介语来说,发音的调域比较窄。在动态组合中,男调域一般为190Hz-100Hz=90Hz、女调域为350Hz-130Hz=220Hz,比中国人窄了20～60Hz。声调掌握的难度顺序是“最难去声,其二上声,其三阳平,最后阴平”。从静态的角度看,阴平调值比较低,在3.0～3.5左右,比中国人发的低了半度到一度度。阳平发得比较容易,能从2.0发到4.0或更高。上声发得有降无升,从中央点降到低点之后就不上升,只从3.0～2.5之间发到1.0～1.5之间。去声多见变得像阴平,少见有下降的基形,从4.0～3.5之间降到3.0～2.5之间,且没有足够的下降速率。从动态的角度看,阴平还发得较低,不平稳,一般在3.5左右。动态阳平没有静态阴平好,基频两头都被缩短,一般在2.5～4.0左右。上声还是有降无升,调值为3.0～1.5左右或更低。去声起点能拉高一点,但终点不能降低,调值为3.5～2.5。此外,本文还对导致偏误的原因进行探讨及寻根。最后提出纠正的方案：克服负迁移、判断去声法、推动主动性、延长声调教学时间、提高教材科学性和针对性、丰富化声调教学方法等。总而言之,文中所研究的内容对越南学生在学习汉语的过程中提供有效之助,也为日益发展的中国对外汉语教学事业尽一份绵力。

关键词：声调调域汉语越语中介语对外汉语教学

Stem cell-based therapy for human diseases

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Signal Transduction and Targeted Therapy 2022年第9期7卷 3242-3282页

作者： Duc M.Hoang Phuong T.Pham Trung Q.Bach anh T.L.Ngo Quyen T.Nguyen Trang T.K.phan Giang H.Nguyen Phuong T.T.Le Van T.Hoang Nicholas R.Forsyth Michael Heke Liem Thanh Nguyen Department of Research and Development Vinmec Research Institute of Stem Cell and Gene TechnologyVinmec Healthcare SystemHanoiVietnam Department of Cellular Therapy Vinmec High.Tech CenterVinmec Healthcare SsystemHanoiVietnam Institute for Science&Technology in Medicine Keele UniversityKeeleUK a Department of Biology Stanford UniversityStanfordCAUSA

Recent advancements in stem cell technology open a new door for patients suffering from diseases and disorders that have yet to be *** cell-based therapy,including human pluripotent stem cells(hPsCs)and multipotent mesenchymal stem cells(MSCs),has recently emerged as a key player in regenerative *** are defined as self-renewable cell types conferring the ability to differentiate into various cellular phenotypes of the human body,including three germ *** are multipotent progenitor cells possessing self-renewal ability(limited in vitro)and differentiation potential into mesenchymal lineages,according to the International Society for Cell and Gene Therapy(ISCT).This review provides an update on recent clinical applications using either hPSCs or MSCs derived from bone marrow(BM),adipose tissue(AT),or the umbilical cord(UC)for the treatment of human diseases,including neurological disorders,pulmonary dysfunctions,metabolic/endocrine-related diseases,reproductive disorders,skin burns,and cardiovascular ***,we discuss our own clinical trial experiences on targeted therapies using MsCs in a clinical setting,and we propose and discuss the MSC tissue origin concept and how MSC origin may contribute to the role of MSCs in downstream applications,with the ultimate objective of facilitating translational research in regenerative medicine into clinical *** mechanisms discussed here support the proposed hypothesis that BM-MSCs are potentially good candidates for brain and spinal cord injury treatment,AT-MSCs are potentially good candidates for reproductive disorder treatment and skin regeneration,and UC-MsCs are potentially good candidates for pulmonary disease and acute respiratory distress svndrometreatment.

关键词： diseases distress treatment

DNA Sequence Classification by Convolutional Neural Network

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Journal of Biomedical Science and Engineering 2016年第5期9卷 280-286页

作者： Ngoc Giang Nguyen Vu anh Tran Duc Luu Ngo Dau phan Favorisen Rosyking Lumbanraja Mohammad Reza Faisal Bahriddin Abapihi Mamoru Kubo Kenji Satou Graduate School of Natural Science and Technology Kanazawa University Kanazawa Japan Institute of Science and Engineering Kanazawa University Kanazawa Japan

In recent years, a deep learning model called convolutional neural network with an ability of extracting features of high-level abstraction from minimum preprocessing data has been widely used. In this research, we proposed a new approach in classifying DNA sequences using the convolutional neural network while considering these sequences as text data. We used one-hot vectors to represent sequences as input to the model;therefore, it conserves the essential position information of each nucleotide in sequences. Using 12 DNA sequence datasets, we evaluated our proposed model and achieved significant improvements in all of these datasets. This result has shown a potential of using convolutional neural network for DNA sequence to solve other sequence problems in bioinformatics.

关键词： DNA Sequence Classification Deep Learning Convolutional Neural Network

Assessment of the Quality of Frozen-Thawed Semen or Epididymal Sperm in Three Native Vietnamese Pig Breeds

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Open Journal of Animal Sciences 2023年第3期13卷 283-297页

作者： Van Khanh Nguyen Huong Thu Thi Vu Huong Le Thi Nguyen Huong Thi Nguyen Au Thi Hoang Dat Van Le Nhung Tuyet Thi Nguyen Hieu Trung phan Yen Kim Thi Pham Son phan Le Quynh anh Le Quynh anh Le Lan Doan Pham Minh Quang Luu Muoi Thi Nguyen Key Laboratory of Animal Cell Biotechnology National Institute of Animal Science Hanoi Vietnam National Institute of Animal Science Hanoi Vietnam Ministry of Science and Technology Hanoi Vietnam Animal Experiments and Domestic Animal Conservation Center National Institute of Animal Science Hanoi Vietnam

Our aim was to evaluate the quality of ejaculated and epididymal frozen-thawed pig sperm of endangered Vietnam native pig breeds. Ejaculated sperm was collected from live boars and epididymal sperm was collected from slaughtered boars of the MuongTe, Kieng Sat and Co BinhThuan breeds and frozen in 0.25 ml straws using a protocol established earlier for modern pig breeds. We evaluated the sperm quality after thawing in terms of motility and rates of viable and abnormal spermatozoa. Our results revealed that the sperm motility and rates of viable and abnormal frozen-thawed sperm were >30%, >44%, and 0.05). In the Co BinhThuan breed, the rate of pregnancy of ejaculated groups was similar to that of the epididymal group. In conclusion, the ejaculated and epididymal sperm of native Vietnamese pigs were successfully frozen. We succeeded in creating embryos in vitro and pregnant pigs after artificial insemination from frozen-thawed semen in three native Vietnamese pig breeds for the first time. The use of the ejaculated sperm improved the production of native pig embryos in vitro efficiency.

关键词： Native Vietnamese Pig In Vitro Porcine Embryo Epididymal Ejaculate Artificial Insemination

Nutritional status of Vietnamese infants assessed by Fenton growth chart and related factors:A cross-sectional study

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Pediatric Investigation 2023年第4期7卷 254-262页

作者： Lieu Thu Thi Nguyen Cuong Danh Tran Ha Thu Thi Nguyen Hai Thanh phan Linh Thuy Nguyen Huong Lan Thi Nguyen anh Hoai Thi Ta Chau Quynh Thi Pho Khanh Nam Do anh Kim Dang Huong Thi Le School of Preventive Medicine and Public Health Hanoi Medical UniversityHanoiVietnam Department of Nutrition National Hospital of Obstetrics and GynecologyHanoiVietnam Department of General Obstetrics National Hospital of Obstetrics and GynecologyHanoiVietnam Department of Nutrition and Dietetics Hanoi Medical University HospitalHanoiVietnam Queensland Alliance for Environmental Health Sciences(QAEHS) The University of QueenslandBrisbaneAustralia

Importance:Nutritional status of infants,measured by birth weight and length,is an essential factor in neonatal *** in newborns may lead to a higher risk of mortality,neurological and cognitive impairment,and poor language ***:This study aims to assess the nutritional status of infants and related factors regarding maternal anthropometric characteristics and medical ***:A cross-sectional study was conducted at the National Hospital of Obstetrics and Gynecology,Vietnam from May 2021 to May 2022 on 340 infants and *** birth weight was defined following the Intergrowth-21 *** was evaluated using the Fenton growth chart when the length was below the 10%percentile line of the gestational *** regression models were applied to identify factors associated with the nutritional status of ***:We found that 12.4%and 14.1%of infants in our study fell into stunted and underweight categories,*** of mothers over 35 years old,having a height lower than 150 cm or experiencing anemia during pregnancy were more likely to be stunted or have low birth *** albumin deficiency during pregnancy was strongly associated with the infant being underweight(odds ratio[OR]=2.8,95%confidence interval[95%CI]1.1–7.3).Newborns were more likely to be stunted if their mothers had a history of preterm birth(OR=3.3,95%CI 1.1–10.2).Interpretation:Maternal nutritional status is closely related to infant malnutrition,particularly in preterm *** the understanding of mothers regarding prenatal care,reproductive healthcare,adequate nutritional diet,and multi-micronutrient supplements during pregnancy is therefore important.

关键词： Fenton chart Infant Low birth weight Stunting Underweight

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垂直绿化综合效应研究

黑龙江生态工程职业学院学报 2017年第4期30卷 13-17页

作者： Tang Van Tai Tran Ngoc Binh Nguyen Nhu anh phan Hong Nhung 东南大学土木工程学院江苏南京210096 越南荣市医学大学越南议案省农业管理所南京工业大学江苏南京211800

除了美观上的效果,垂直绿化缓解热岛效应,减少水土流失,防尘减噪,节能环保,延长建筑寿命等作用也被越来越多的人意识到,有关垂直绿化各方面定性的研究也不断得到开展。以南京的三种墙面绿化形式—攀援式墙面绿化、铺贴式墙面绿化和组合... 详细信息

除了美观上的效果,垂直绿化缓解热岛效应,减少水土流失,防尘减噪,节能环保,延长建筑寿命等作用也被越来越多的人意识到,有关垂直绿化各方面定性的研究也不断得到开展。以南京的三种墙面绿化形式—攀援式墙面绿化、铺贴式墙面绿化和组合移动式墙面绿化作为研究对象,通过测定垂直绿化的降温、减噪和心理效应探讨垂直绿化对建筑环境的综合影响。

关键词：垂直绿化热效应噪音效应

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城市湖泊生态改造设计

安徽农学通报 2016年第23期22卷 100-101,121页

作者： Tang Van Tai Tran Ngoc Binh Nguyen Nhu anh phan Hong Nhung 东南大学土木工程学院市政工程系江苏南京210096

转通湖泊驳岸技术是使用混凝土和浆砌石材料来建造硬质直立式驳岸结构为达到固土目标,但是硬化混凝土驳岸系统已经破坏了湖泊水生态和自然景观。湖泊生态化改造是通过土木工程结合生态技术,强化湖泊的自身防止污染功能,同时提高了湖泊... 详细信息

转通湖泊驳岸技术是使用混凝土和浆砌石材料来建造硬质直立式驳岸结构为达到固土目标,但是硬化混凝土驳岸系统已经破坏了湖泊水生态和自然景观。湖泊生态化改造是通过土木工程结合生态技术,强化湖泊的自身防止污染功能,同时提高了湖泊生态多样性及水体自能力[1]。该研究通过调研越南荣市气候、环境特点与南湖污染现状,提出了湖泊驳岸生态化改造设计方案。

关键词：水生态修复越南南湖生态驳岸湖泊改造