Vietnam Journal of Science, Technology and Engineering最新文献_第3页

Fluctuations in agriculture and sediment in the Mekong delta of Vietnam due to increased upstream water use 由于上游用水增加，越南湄公河三角洲农业和沉积物的波动

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).77-82

V. H. Bui, N. Nguyen

引用次数: 0

Development of inducer-free expression plasmidsusing IPTG-inducible Pspac promoter for Bacillus subtilis 利用iptg诱导的枯草芽孢杆菌pspace启动子制备无诱导剂表达质粒

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).64-70

Phuong Thi Mai Chu, H. Phan, H. Nguyen, T. Phan

引用次数: 2

Co-digestion of domestic wastewater and organic fraction of food waste using anaerobic membrane bioreactor: a pilot scale study 厌氧膜生物反应器协同消化生活污水和食物垃圾有机组分的中试研究

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).71-76

H. Bui, Vietnam Environment, L. Nguyen, Thanh Tri Nguyen, P. Nguyen

{"title":"Co-digestion of domestic wastewater and organic fraction of food waste using anaerobic membrane bioreactor: a pilot scale study","authors":"H. Bui, Vietnam Environment, L. Nguyen, Thanh Tri Nguyen, P. Nguyen","doi":"10.31276/VJSTE.63(1).71-76","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).71-76","url":null,"abstract":": In this study, a co-digestion pilot scale study of a mixture of domestic wastewater and the organic fraction of food waste using an anaerobic membrane bioreactor was developed. The results show that the removal efficiencies of the chemical oxygen demand (COD) and total suspended solids (TSS) were high and reached more than 90%. However, the removal of nitrogen and phosphate was not remarkable. The daily biogas yield reached 2.12 m 3 /d. The obtained biogas per COD removed was 0.22 m 3 /kgCOD removed . The average generated methane yield was 1.33 m 3 /d, which is equivalent to 0.14 m 3 /kgCOD removed . A high efficiency of organic compound removal combined with a large amount of retained nutrients and high biogas yield suggests the results of this pilot scale study can be practically applied to the recovery of nutrients for agricultural use along with biogas for cooking. These benefits remarkably reduce environmental pollution, especially for decentralized residential areas and independent-stationed military units located far from concentrated wastewater treatment plants.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"60 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79999017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of Centella asiatica on cognitive deficits caused in trimethyltin-induced neurotoxicity model mice 积雪草对三甲基锡致神经毒性模型小鼠认知功能缺损的影响

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).59-63

H. K. T. Pham, Hong Nguyen Tran, Xoan Thi Le, K. Nguyen, Hiep T Nguyen, Lap Thi Nguyen, Folk R. William

引用次数: 1

Influences of seed priming with Spirulina platensisextract on seed quality properties in black gram (Vigna mungo L.) 螺旋藻提取物灌种对黑克兰种子品质的影响

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).36-41

N. Q. Thinh

{"title":"Influences of seed priming with Spirulina platensisextract on seed quality properties in black gram (Vigna mungo L.)","authors":"N. Q. Thinh","doi":"10.31276/VJSTE.63(1).36-41","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).36-41","url":null,"abstract":"As a natural biofertilizer, cyanobacteria’s ability to fix N 2 improves the growth and yield of crops through the production of growth promoters such as gibberellins, cytokinins, auxins, vitamins, antibiotics and amino acids [4]. Abstract: Black gram ( Vigna mungo L.) is a high nutrient pulse crop. Its seed quickly and easily deteriorates after harvest, resulting in poor planting material production that must be improved accordingly by seed enhancement methods. The blue-green microalgae Spirulina platensis contains variously beneficial substances, including macro and micro nutrients, vitamins, amino acids and antioxidants. The aim of this study is to improve the vigour and germination of black gram by priming its seeds with Spirulina platensis extract to prevent seed deterioration. Medium vigour black gram seeds were subjected to hydropriming for three hours (T 2 ); other seeds were primed with Spirulina platensis extract at 1.5% for three hours (T 3 ) while unprimed seeds served as control (T 1 ). Then, the seeds were artificially aged under 40±1 o C and 95±5% relative humidity for five days. The results revealed that the hydropriming and control of black gram seeds were significantly lower in all physiological and biochemical seed quality parameters than seeds primed with Spirulina platensis extract at 1.5% for three hours. Consequently, Spirulina platensis extract can effectively enhance black gram seeds and use agents in.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78682471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Evaluation of clinical characteristics and lower esophageal sphincter pressure on high resolution manometry in achalasia patients after treatment 治疗后贲门失弛缓症患者的临床特征及高分辨测压法下食管括约肌压力的评价

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).42-46

L. N. Thuy, Vietnam Hepatology, Tran Thi Tam Thu, H. Minh, H. D. Viet

{"title":"Evaluation of clinical characteristics and lower esophageal sphincter pressure on high resolution manometry in achalasia patients after treatment","authors":"L. N. Thuy, Vietnam Hepatology, Tran Thi Tam Thu, H. Minh, H. D. Viet","doi":"10.31276/VJSTE.63(1).42-46","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).42-46","url":null,"abstract":": Objective: to describe the clinical characteristics and lower esophageal sphincter (LES) pressures on high-resolution manometry (HRM) in patients with achalasia pre- and post-treatment. Methods: a case series study was conducted in achalasia patients. Clinical symptoms, Eckardt score, upper gastrointestinal endoscopy, esophageal barium swallow, and HRM results were collected on baseline and Eckardt score and HRM results on follow-up were collected. Results: from June 2018 to December 2019, 14 patients were recruited including 6 males and 8 females with mean age of 34.6±10.5 y. The proportion of achalasia type I, II, and III were 28.6, 64.3, and 7.1%, respectively. The Eckardt score, LES resting pressure (for both baseline period and swallow phase) and 4-s integrated resting pressure (IRP4s) significantly decreased after treatment (p<0.05). There was a correlation between pre-treatment LES resting pressure (in swallow phase) and change in chest pain score (p=0.044, r=0.546) and a correlation between pre-treatment IRP4s and change in Eckardt score (p=0.041, r=0.549). IRP4s had no significant difference between treatment success and recurrence groups. After treatment, 11 patients had clinical success and 3 patients recurred/failed after a median of 4 mo. The diagnosis on HRM after treatment included 5 achalasia (4 type I and 1 type II), 1 esophagogastric junction outflow obstruction (EGJOO), 1 distal esophageal spasm (DES), 6 absent contractility, and 1 ineffective esophageal motility (IEM). Conclusion: Eckardt score, LES pressure, and IRP4s improved significantly after treatment. Besides the role of classification and treatment option, HRM could be used to predict the treatment outcome in achalasia.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80444615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Removal of greenhouse gas in biofilter using organic and inorganic media 利用有机和无机介质去除生物过滤器中的温室气体

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).83-89

N. T. Tung, W. Chiemchaisri, C. Chiemchaisri, Samunya Sanguanpak

{"title":"Removal of greenhouse gas in biofilter using organic and inorganic media","authors":"N. T. Tung, W. Chiemchaisri, C. Chiemchaisri, Samunya Sanguanpak","doi":"10.31276/VJSTE.63(1).83-89","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).83-89","url":null,"abstract":"Moreover, we also investigated N 2 O conversion, which occurred simultaneously with CH 4 oxidation, during gas treatment in the biofilter. Abstract: A biofilter using organic (compost) and inorganic (pumice, porous silica pellet or poremat) media was applied to the removal of methane (CH 4 ) and nitrous oxide (N 2 O) to minimize the impact of off-gasses from municipal solid waste disposal global. The objective was to determine the appropriate biofilter media for CH 4 oxidation and N 2 O conversion. The off gas (59.6% CH 4 , 1.0% N 2 O) was fed simultaneously with air (1:3 ratio) into the biofilter. CH 4 oxidation and N 2 O conversion rates were observed over a 101-day period through the analysis of gas concentration along the biofilter’s depth using gas chromatography. Higher CH 4 oxidation in the biofilters containing organic and inorganic media was achieved, especially for the compost-poremat biofilter with 70.1 g CH 4 /m 3 /d realised. The most active methane oxidation zone was found near the gas inlet at the bottom of the biofilter. The presence of inorganic material helped promote aerobic conditions for CH 4 oxidation, especially during the initial period. N 2 O was also more completely removed with the biofilter containing inorganic media. Higher methanotrophic activities in matured biofilter media and the presence of methanotrophs type I, which prefer oxygen-rich conditions, were confirmed.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"173 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78911458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sustainability assessment of community-based water resource management of irrigation systems for agriculture 基于社区的农业灌溉系统水资源管理的可持续性评估

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).90-96

H. T. Huong, P. N. Ánh, Vietnam Environment

{"title":"Sustainability assessment of community-based water resource management of irrigation systems for agriculture","authors":"H. T. Huong, P. N. Ánh, Vietnam Environment","doi":"10.31276/VJSTE.63(1).90-96","DOIUrl":"https://doi.org/10.31276/VJSTE.63(1).90-96","url":null,"abstract":": To study community-based water resource management (CbWRM) of irrigation for agriculture, the participation of the community in the management of the irrigation system must be considered. CbWRM is the cooperation between a farming organization (the water-using cooperative group) and state-related organizations (such as the Department of Water Resources Management and commune-level authorities) in the process of the operation and management of water. In the CbWRM model, the community participates in the selection and election of the management board, meetings to collect ideas to build a CbWRM model, and financial contributions to water use fees. The community also participates in the annual operational planning of water use. Therefore, this study aimed to develop indicators to assess the sustainability of the CbWRM model of irrigation for agriculture in the Hau Giang province, Vietnam. With an assessment result of 0.54 (relatively sustainable), this study shows a picture of water resource management in general and community participation in particular. These research results can help managers and policymakers promote community participation to achieve high-efficiency water resource management in the agriculture of the Hau Giang province.","PeriodicalId":23548,"journal":{"name":"Vietnam Journal of Science, Technology and Engineering","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82092625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meningococcal disease in one soldier patient: case report from Vietnam 越南士兵一例脑膜炎球菌病病例报告

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-31 DOI: 10.31276/VJSTE.63(1).54-58

N. Viet, Nguyen Minh Nam, N. V. Trung, D. T. Anh, H. Tong

引用次数: 1

Study on extracting hemicellulose, cellulose, and carboxymethyl cellulose from Vietnamese rice straw waste 从越南稻草废料中提取半纤维素、纤维素和羧甲基纤维素的研究

Vietnam Journal of Science, Technology and Engineering Pub Date : 2021-03-16 DOI: 10.31276/VJSTE.63(1).15-20

Mai Thi Tuyet Phan, Trang Thu La, T. H. A. Ngo

引用次数: 2