SCITECH Nepal最新文献_第2页

COVID-19 Lockdown's Effect on Building Construction Projects in Kathmandu Valley Nepal COVID-19 封锁对尼泊尔加德满都谷地建筑施工项目的影响

SCITECH Nepal Pub Date : 2023-12-13 DOI: 10.3126/scitech.v17i1.60497

Kreeti Bajracharya, Dinesh Sukamani

{"title":"COVID-19 Lockdown's Effect on Building Construction Projects in Kathmandu Valley Nepal","authors":"Kreeti Bajracharya, Dinesh Sukamani","doi":"10.3126/scitech.v17i1.60497","DOIUrl":"https://doi.org/10.3126/scitech.v17i1.60497","url":null,"abstract":"This research intends to assess the critical factors as an effect of COVID-19 lockdown on selected building construction projects within the Kathmandu Valley in Nepal. The research identifies “Health and Safety risk management” as the most critical factor compared to the other critical components namely supply chain operation, contractual and construction financial market. This research focuses on utilizing systematic partial least squares structural equation modeling to assess the effect of COVID-19 lockdown. Further, it seeks to demonstrate the direct relationships between COVID-19 effects and the critical factors that have been affected as a result of the pandemic. The study considers these factors as essential components in assessing the overall impact of COVID-19. This study attempts to evaluate and examine the significant pandemic effects on building construction projects. Nepal-based construction firms, government agencies, and non-government organizations were surveyed to identify critical factors affected by COVID-19 in building projects. The quantitative design method of this study included the use of smart partial least squares structural equation modeling (PLS-SEM), one of the statistical tools. Information like the fundamentals of the project, its state, etc., have been considered. 104 valid responses were received out of 130 questionnaires distributed supported at less than 1 % significance level. The inner structural model analysis, with a highest value of 7.014 and a beta value of 0.474, highlights the significance of the relationship between safety and risk management factors and COVID-19 effect in building construction projects. This relationship stands out as highly significant when compared to other constructs examined in the study. The findings underscore the crucial role of safety and risk management practices in mitigating the effects of the pandemic on construction projects.","PeriodicalId":183221,"journal":{"name":"SCITECH Nepal","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139003878","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

Effect of Steel Jacketing Thickness on Seismic Performance of Bridge 钢护套厚度对桥梁抗震性能的影响

SCITECH Nepal Pub Date : 2023-12-13 DOI: 10.3126/scitech.v17i1.60457

Rajan Suwal, Binaya Jamarkattel

{"title":"Effect of Steel Jacketing Thickness on Seismic Performance of Bridge","authors":"Rajan Suwal, Binaya Jamarkattel","doi":"10.3126/scitech.v17i1.60457","DOIUrl":"https://doi.org/10.3126/scitech.v17i1.60457","url":null,"abstract":"The bridges of Nepal are getting older and old bridges were designed without considering the seismic forces, hence have low seismic capacity. The capacity of these bridges needs to be enhanced and should perform well during seismic events. The jacketing technique can be used to upgrade the bridge's structural performance. This research paper mostly focuses on the seismic performance enhancement after the application of steel jacketing on the bridge pier. The variable that has been varied is the thickness of the steel jacket. The capacity of a bridge pier is evaluated using displacement-controlled nonlinear static analysis (Pushover). The time history load is applied to the structure to determine the seismic demand of the bridge. The quantification of the enhancement of the bridge structure after the application of Steel Jacketing is evaluated by plotting the fragility curve. The modeling of the bridge is done in CSI Bridge V20.2.0. The different damage state is defined using the strain values obtained from the pushover analysis. For different damage states, the capacity and demand value are used to obtain the probability of exceeding at different PGA levels. The fragility curve is developed using the First Order Second Order Method (FOSM). From the study, it is found, that the vulnerability of the bridge after the use of jacketing for extensive damage state, the probability of failure reduced from 28.22% to 14.24% at 1.0g PGA. Similarly, the vulnerability of the bridge after the use of jacketing for collapse damage state, the probability of failure decreased from 16.93% to 7.22% at 1.0 PGA","PeriodicalId":183221,"journal":{"name":"SCITECH Nepal","volume":"37 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139003917","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

Cost Comparison of Flexible Pavement on Weak Sub-Grade Soil Modified with Lime and SD 用石灰和 SD 改性的软弱下层土壤上铺设柔性路面的成本比较

SCITECH Nepal Pub Date : 2023-12-13 DOI: 10.3126/scitech.v17i1.60491

Braj Kishore Chaudhary, Gopal Gautam

{"title":"Cost Comparison of Flexible Pavement on Weak Sub-Grade Soil Modified with Lime and SD","authors":"Braj Kishore Chaudhary, Gopal Gautam","doi":"10.3126/scitech.v17i1.60491","DOIUrl":"https://doi.org/10.3126/scitech.v17i1.60491","url":null,"abstract":"The effectiveness of flexible pavement is affected by the subgrade quality. The subgrade refers to a compacted layer of soil that provides sideways support to the pavement. When constructed on a weak subgrade, it negatively impacts the pavement's performance, leading to a shorter lifespan. Traditionally, the common method to stabilize a soft subgrade involves removing the weak soil and replacing it with stronger soil. However, due to the high expenses associated with soil replacement, highway agencies are exploring alternative approaches to constructing highways on soft subgrades. Soil stabilization is a commonly employed alternative in pavement construction, serving as an effective method to enhance the engineering characteristics of soil, including its strength and stability. This paper focuses on the utilization of lime and stone dust (SD) as admixtures for an efficient ground improvement technique over weak subgrade soil deposits. The California Bearing Ratio (CBR) test is conducted by making the specimens of weak subgrade by adding the variable percentages of a mixture of lime and SD. First, the soil was mixed up with lime to 12% by weight with an increment of 3% again the soil was mixed with SD with increments of 10% up to 50% by weight of soil. The study determined an optimal lime content of 3% based on the geotechnical properties of the mixture and the cost considerations of lime and the weak subgrade. Following this, SD was added to the optimized lime-weak subgrade mixture in varying increments of 10% by weight, up to a maximum of 40%. The modified mixes were then evaluated for their CBR and maximum dry density values. The CBR is increased to 15% and the total pavement thickness decreased to 725 mm for 50% SD addition with 4.89 % in cost reduction.","PeriodicalId":183221,"journal":{"name":"SCITECH Nepal","volume":"37 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139005609","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

Current Status of Assistive Technology for AAC for People with Autism Spectrum Disorders in Nepal 尼泊尔自闭症谱系障碍患者AAC辅助技术的现状

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49101

Sachin Shrestha, Amitta Shah

{"title":"Current Status of Assistive Technology for AAC for People with Autism Spectrum Disorders in Nepal","authors":"Sachin Shrestha, Amitta Shah","doi":"10.3126/scitech.v15i1.49101","DOIUrl":"https://doi.org/10.3126/scitech.v15i1.49101","url":null,"abstract":"This paper is focussed on the current status of usage of assistive technology for augmentative and alternative communication (AAC) for the person with autism spectrum disorder (ASD) in Nepal. ASD is marked by core features including impaired social communication, and restrictive and repetitive behaviours and interest (Diagnostic and Statistical Manual of Mental Disorders 5th Edition: DSM 5). AAC is a specific type of assistive technology that can benefit person with autism (PWA) of all ages by promoting independence, expanding communication and increasing social interactions. The major objective of this paper is to analyse the current status of AAC assistive technology for person with autism (PWA) in Nepal. The paper first analysed the assistive technology in general and then is inclined toward the current status of its development in Nepal. The research methodology of the paper included interviews and discussion sessions. The data were further reviewed based on the reports from the relevant organizations and learning outcomes from different autism related trainings and workshops. The authors visited various organizations related to autism in Nepal, Autism Care Nepal Society (ACNS) and Special School for Disability and Rehabilitation Center (SSDRC) and carried out interviews and discussions and also participated in various autism related training sessions and workshops. The findings of this paper showed that despite the high prevalence rate of autism, there is very less progress in managing ASD in Nepal and that the usage of assistive devices is limited to low tech only.","PeriodicalId":183221,"journal":{"name":"SCITECH Nepal","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134634975","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

Study on Road Transportation and Their Status at Shadananda Municipality in Bhojpur 博吉普尔市沙达南达市道路交通及其现状研究

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49099

Mohan Dhoja K.C.

引用次数: 0

Occupational Hazards in Building Construction 建筑施工中的职业危害

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49098

S. Shrestha

{"title":"Occupational Hazards in Building Construction","authors":"S. Shrestha","doi":"10.3126/scitech.v15i1.49098","DOIUrl":"https://doi.org/10.3126/scitech.v15i1.49098","url":null,"abstract":"Minor injury to fatality and permanent disablement cases due to accident at the construction sites are one of the highest as compared to the other sector. Hence, there is an urgent need to mitigate this problem. The first step that should be taken is identifying the hazard to ensure a safe and conducive working condition. Therefore, this paper is intended to identify and highlight the hazards that are most commonly found at our construction sites today. The data collection was carried out through a questionnaire forms and checklist survey regarding hazards in construction. The sites include high rise commercial building projects. The study determines six major groups of hazards in relation to works at construction sites such as physical, chemical, mechanical, biological, psychological and physiological hazards. The study was conducted on 50 contractors and 5 building construction sites. The results showed that the most common hazards for the project around the study area are noise, electric shock and vibrations as the major physical hazards; cement dust and sand dust as major chemical hazard; hit by equipment as major mechanical hazard and job dissatisfaction as major psychosocial hazard in building construction projects. Thus, contractors should be responsible and accountable for documenting different types of hazards as they are implementing agent of safety during the construction and development of any project. For this, awareness level should be increased by conducting regular awareness program, along with engineering and enforcement activities.","PeriodicalId":183221,"journal":{"name":"SCITECH Nepal","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121224509","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

Base Isolation Method for Earthquake Resistant Buildings 抗震建筑地基隔震方法

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49104

Dibyashree Lohani, Sanyog Kumar Upadhay, Surya Bikram Dahal, Shristi Adhikari, Geetika Shrestha

引用次数: 0

Variational FEM Approach to the Study of Drug Distribution in Dermal Layers in Transdermal Drug Delivery System 用变分有限元方法研究透皮给药系统中药物在真皮中的分布

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49096

S. Pradhananga

引用次数: 0

From the Editor's Desk Vol.15(1) 来自编辑台第15卷(1)

SCITECH Nepal Pub Date : 2020-12-28 DOI: 10.3126/scitech.v15i1.49095

H. Shrestha