Scientific Review Engineering and Environmental Sciences最新文献_第2页

Detecting the relations between meteorological elements and alpha and beta activity concentration at Al-Tuwaitha site, Baghdad 探测巴格达Al-Tuwaitha站点气象要素与α和β活动浓度之间的关系

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-08 DOI: 10.22630/pniks.2021.30.3.33

Salwa Naif, M. Al-Jiboori, Thoalfaqar Al-Rbayee

引用次数: 0

Sustainable acoustic insulation for prefabricated concrete homes in Andean zones 安第斯地区预制混凝土房屋的可持续隔音

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-08 DOI: 10.22630/pniks.2021.30.3.42

Marcel Paredes, Alexis Andrade, Valeria Arroba, Tito Castillo, Fausto Lopez

{"title":"Sustainable acoustic insulation for prefabricated concrete homes in Andean zones","authors":"Marcel Paredes, Alexis Andrade, Valeria Arroba, Tito Castillo, Fausto Lopez","doi":"10.22630/pniks.2021.30.3.42","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.42","url":null,"abstract":"The construction sector is undoubtedly one of the main promoters for economic and social development. The modern concept of the prefabrication of elements originated from the industrial revolution to reduce costs and increase production through the mechanization of work, increasing the quality and ease of control in the plant. Prefabricated concrete homes are aimed at the popular sectors, however, when talking about acoustic habitability comfort we refer to constructive solutions used in a building to minimize the transmission of sounds (noise pollution) from outside or from an adjoining enclosure. This is achieved with the use of acoustic insulation materials. In the present research, through a bibliographic review, the updated state-of-the-art search methodology is developed, supported by the Delphi and AHP (hierarchical analytical process) methods and with the opinion of experts to compare the properties of acoustic insulating materials; in order to publicize the best acoustic insulators to be installed inside prefabricated concrete homes. Within the bibliographic review, new technologies with sustainable materials found as feasible prototypes were investigated in Ecuador, where thanks to its diversity of ecosystems and the necessary existing technology, the natural fibers used in the prototypes for insulation/absorption are easily found acoustics in homes.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68303878","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

Investigation the effect of newly used polymer modified bitumen on the performance of hot mix asphalt containing reclaimed asphalt pavement 研究了新用聚合物改性沥青对含再生沥青路面热拌沥青性能的影响

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-08 DOI: 10.22630/pniks.2021.30.3.38

Osamah Chafat, Sahar Al-Ghurab, B. Al-Humeidawi

引用次数: 0

Removal of Meropenem by using Lemna minor 用小柠檬去除美罗培南

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-08 DOI: 10.22630/pniks.2021.30.3.41

N. Saad, S. Al-Dulaimi

引用次数: 0

Mesoscale modeling of fracture in cement and asphalt concrete 水泥和沥青混凝土断裂的中尺度模拟

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.37

H. Al-Jelawy, A. Al-Rumaithi, Aqeel T. Fadhil, A. Naji

{"title":"Mesoscale modeling of fracture in cement and asphalt concrete","authors":"H. Al-Jelawy, A. Al-Rumaithi, Aqeel T. Fadhil, A. Naji","doi":"10.22630/pniks.2021.30.3.37","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.37","url":null,"abstract":"In this paper, mesoscale modeling is performed to simulate and understand fracture behavior of two concrete composites: cement and asphalt concrete using disk-shaped compact tension (DCT) tests. Mesoscale models are used as alternative to macroscale models to obtain better realistic behavior of composite and heterogeneous materials such as cement and asphalt concrete. In mesoscale models, aggregate and matrix are represented as distinct materials and each material has its characteristic properties. Disk-shaped compact tension test is used to obtain tensile strength and fracture energy of materials. This test can be used as a better alternative to other tests such as three points bending tests because it is more convenient for both field and laboratory specimens in addition to its accurate results. Comparing the numerical results of the mesoscale models of cement and asphalt concrete specimens with experimental data shows that these models can predict the behavior of these composite materials very well as seen in the curves of load-crack mouth opening displacement (CMOD). Also, the mesoscale modeling highlights the variability of crack direction where it is dependent on the random distribution of aggregate.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68303811","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

Approaching of May maximum surface air temperature to characteristic summer season for Baghdad city 巴格达市5月地表最高气温接近夏季特征

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.34

Sara Muter, A. Hassan, Jasim H. Kadhum

{"title":"Approaching of May maximum surface air temperature to characteristic summer season for Baghdad city","authors":"Sara Muter, A. Hassan, Jasim H. Kadhum","doi":"10.22630/pniks.2021.30.3.34","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.34","url":null,"abstract":"Seasonal variability is the complex non-linear response of the physical climate system. There are two types of natural variability: those external and internal to the climate system. In any given season, natural variability may cause the climate to be different than its long-term average. This study examines with the seasonal variation of the maximum temperatures during the summer season. In addition, the maximum temperatures in May become close to the characteristics of the summer season. The monthly data for maximum temperature of May, June and July were used from Iraqi Meteorological Organization and Seismology (IMOS) for 47 years from 1970 to 2017 for Baghdad city. This period was long enough to estimate the range of approaching maximum temperature (Tmax) May to summer. Results revealed a significant Tmax for Baghdad during the second period (1992–2017) and ‎shown similar behavior of Tmax in May to June and July; on the contrary that first period (1970–1991). In second period, two phases have been found out, positive phase and negative phase. The positive phase were happened in 1995, 1999, and 2006, and the negative phase was four cases (1992, 2004, 2013, and 2016), while a few cases recorded in first period. The amplitudes of monthly variability had same distance of leaner correlation especially in 1999 and 2013 that represent coherent wave with summer seasons. The variance difference for Tmax between May and June approximately was 2°C for second study’s period, while exceed this range in first period. This variance change to 7.5°C when found difference between July and May.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48409069","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

Strength of eccentrically tensioned reinforced concrete structures with small eccentricities by normal sections 小偏心截面偏心张拉钢筋混凝土结构的强度

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.36

Yevhen Dmytrenko, Oleg Fesenko, I. Yakovenko

{"title":"Strength of eccentrically tensioned reinforced concrete structures with small eccentricities by normal sections","authors":"Yevhen Dmytrenko, Oleg Fesenko, I. Yakovenko","doi":"10.22630/pniks.2021.30.3.36","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.36","url":null,"abstract":"It is implemented the method of normal rectangular sections slab (shell) reinforced concrete elements strength calculating with flat eccentric tensile strength using the deformation m ethod. The results of the calculation are analyzed for the case of eccentric tension with small eccentricities with varying next parameters: the height of the cross section and the reinforcement coefficient. It is investigated the character of diagrams condition change of section “N – εc(1)” at gradual change of the stress-strain state from eccentric to the central tension. It is revealed that when the eccentricity of external forces decreases, the compressed zone of concrete decreases until its complete disappearance, and at rather small values of eccentricities of force application the balance between external and internal forces cannot be found by the method of current norms. An equilibrium is found between internal and external forces only at a two-digit diagram of the distribution of relative longitudinal deformations (in the case of a compressed zone). Variants of the given problem decision without considerable loss of calculations accuracy are offered, the most expedient of which is transition to algorithm of calculation by a method of limiting efforts. It was accepted as the basic in the previous building norms. The results of numerical calculations performed in the software complex “Lira-CAD” and the corresponding mathematical modeling confirmed the rationality and allowable accuracy of further calculations by this method.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68303767","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: 2

Longitudinal shear in composite deck slabs using corrugated steel sheets 波纹钢板复合板的纵向剪切

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.35

Hakim Alkurayshi, Alaa I. Dawood, Ahmed Hakim S., A. Jawad

{"title":"Longitudinal shear in composite deck slabs using corrugated steel sheets","authors":"Hakim Alkurayshi, Alaa I. Dawood, Ahmed Hakim S., A. Jawad","doi":"10.22630/pniks.2021.30.3.35","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.35","url":null,"abstract":"Profile deck steel sheets are used in composite deck slabs. These sheets are standard in dimensions and shapes besides they are supplied with embossments and indentations. Such sheets are not available in Iraqi markets nowadays therefore people used another type of sheets which are corrugated without embossments or indentations in very wide range. This study covers the use of such sheets in composite slabs as decks instead of standard profiled steel sheets. The study comprises testing slabs of dimensions 0.9 × 2.5 m reinforced by steel fabric mesh and rested on corrugated sheets. Two types of shear spans are selected shorter and longer to study the longitudinal shear force transmitted due to the applied loads according to the Eurocode 4. The shorter shear spans are 600, 500 and 400 mm while longer one is 800, 750 and 700 mm. The study extended to support the requirements of design equation of the Eurocode by shear bond method also known as m–k method. The evaluated values of m and k are 0.094 and 65 respectively. The result of k which plays a very important role in shear transfer is small compared to what available in literature, therefore it is recommended to make use of shear connectors in such construction or any else method.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68303756","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

Use of waste paper ash or wood ash as substitution to fly ash in production of geopolymer concrete 利用废纸灰或木灰替代粉煤灰生产地聚合物混凝土

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.39

Haider Owaid, Haider M. Al-Baghdadi, M. Al-Rubaye

{"title":"Use of waste paper ash or wood ash as substitution to fly ash in production of geopolymer concrete","authors":"Haider Owaid, Haider M. Al-Baghdadi, M. Al-Rubaye","doi":"10.22630/pniks.2021.30.3.39","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.39","url":null,"abstract":"Large quantities of paper and wood waste are generated every day, the disposal of these waste products is a problem because it requires huge space for their disposal. The possibility of using these wastes can mitigate the environmental problems related to them. This study presents an investigation on the feasibility of inclusion of waste paper ash (WPA) or wood ash (WA) as replacement materials for fly ash (FA) class F in preparation geopolymer concrete (GC). The developed geopolymer concretes for this study were prepared at replacement ratios of FA by WPA or WA of 25, 50, 75 and 100% in addition to a control mix containing 100% of FA. Sodium hydroxide (NaOH) solutions and sodium silicate (Na2SiO3) are used as alkaline activators with 1M and 10M of sodium hydroxide solution.The geopolymer concretes have been evaluated with respect to the workability, the compressive strength, splitting tensile strength and flexural strength. The results indicated that there were no significant differences in the workability of the control GC mix and the developed GC mixes incorporating WPA or WA. Also, the results showed that, by incorporating of 25–50% PWA or 25% WA, the mechanical properties (compressive strength, splitting tensile strength and flexural strength) of GC mixes slightly decreased. While replacement with 75–100% WPA or with 50–100% WA has reduced these mechanical properties of GC mixes. As a result, there is a feasibility of partial replacement of FA by up to 50% WPA or 25% WA in preparation of the geopolymer concrete.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68303833","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: 6

Operation and maintenance financial feasibility analysis of centralized domestic wastewater treatment system (case study: Palembang City Sewerage Project) 集中式生活污水处理系统的运营和维护财务可行性分析（案例研究：巨港城市下水道项目）

Scientific Review Engineering and Environmental Sciences Pub Date : 2021-10-01 DOI: 10.22630/pniks.2021.30.3.40

Larap Estu, Febrian Hadinata, B. Susanti

{"title":"Operation and maintenance financial feasibility analysis of centralized domestic wastewater treatment system (case study: Palembang City Sewerage Project)","authors":"Larap Estu, Febrian Hadinata, B. Susanti","doi":"10.22630/pniks.2021.30.3.40","DOIUrl":"https://doi.org/10.22630/pniks.2021.30.3.40","url":null,"abstract":"Budget needed for operation and maintenance of centralized domestic wastewater management in Indonesia is often overlooked. This results in fail systems, high idle capacity, and abandoned assets. While the economic feasibility often used as the basis for centralized domestic wastewater infrastructure construction, the financial feasibility often shown a different result. The construction phase will be feasible according the analysis, while the operation and maintenance phase will have a different result. As unsolicited projects, the operation and maintenance of sewerage in Indonesia always have budget difficulties, thus needed scenario to resolve the matter. In this study, cost and revenue variable will be analyzed to determine the feasibility value based on NPV, BCR, and IRR calculations. The revenue comes from user charge tariffs on household and commercials connections, and cost variable consists of: chemical usage cost; sludge disposal cost; personnel wage cost; fuel and electricity cost; spare-part replacement cost. The analysis will determine whether both household connection and commercials connection in the sewerage system have positive results. Should negative results emerged, follow up analysis added to elevate the results consists of following scenarios: sensitivity analysis for tariffs adjustment; sensitivity analysis adding grant as option; sensitivity analysis adding loan as option. While analysis of base tariffs shown negative results on NPV, BCR, and IRR calculation, the follow up analysis shown significant changes thus the results is desirable.","PeriodicalId":38397,"journal":{"name":"Scientific Review Engineering and Environmental Sciences","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48553071","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