Volume 21, Issue 1最新文献

Comparison of 2D and 3D Finite Element Analysis of RC Blocks Culvert Based on Soil-Structure Interaction Using GTS 基于GTS的混凝土砌块涵洞土-结构相互作用二维与三维有限元分析比较

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.09

A. Ajwad

引用次数: 0

Unfolding the Locale of Membrane Proteins within Cellular Alcove by SVM 基于支持向量机的膜蛋白定位研究

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.05

Mehwish Faiz

引用次数: 0

Isolated Cascaded DAB DC-DC Converter to Boost Medium DC Voltage to HVDC 隔离级联DAB DC-DC变换器提升中直流电压到HVDC

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.01

Muhammad Danial Afridi

{"title":"Isolated Cascaded DAB DC-DC Converter to Boost Medium DC Voltage to HVDC","authors":"Muhammad Danial Afridi","doi":"10.52584/qrj.2101.01","DOIUrl":"https://doi.org/10.52584/qrj.2101.01","url":null,"abstract":"The offshore wind farms typically use ac system to collect power from each generator, with the voltage increased by means of high, heavy step-up transformers. DC collection grids have also recently been taken into consideration as solution to simplify and minimize the offshore windfarm platforms. DC collection grids offer an additional method to reduce complexity of offshore windfarms. However, to increase the DC voltage for HVDC transmission requires the development of high-power and high voltage converters, which presents a technical challenge. This research makes use of an isolated cascaded dual active bridge (DAB) DC-DC converter to boost medium DC voltage to HVDC. Isolated Cascaded DAB DC-DC Converters are connected in series on the output side and in parallel on the input side to obtain a high transformation ratio and high power. The bidirectional DAB DC-DC converters cab be designed with power densities in the variability of tens to hundreds of kilowatts, depending on the components used and the switching frequency at which the converters function most effectively. The input parallel output series (IPOS) topology, 225 kV HVDC can be generated from a 5 kV MVDC input by cascading DAB DC-DC up to 30 stages. This converter family is useful due to its scalability and flexibility, since the power and voltage ratings can be increased while still using the same cells. MATLAB Simulink simulations are performed and verified the elementary operating characteristics of the system.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"241 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115600397","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

Efficient use of PV in a Microgrid using Reinforcement Learning 利用强化学习在微电网中高效使用PV

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.13

Khawaja Haider Ali

{"title":"Efficient use of PV in a Microgrid using Reinforcement Learning","authors":"Khawaja Haider Ali","doi":"10.52584/qrj.2101.13","DOIUrl":"https://doi.org/10.52584/qrj.2101.13","url":null,"abstract":"Artificial Intelligence is a new concept to optimize or schedule the energy storage system of the Microgrid. The reinforcement learning (RL) method can be used in the effective scheduling of the battery connected to the microgrid. The proposed strategy aims to reduce energy costs while prioritizing both energy balance and user comfort within the microgrid. The key innovation lies in developing an optimal policy for battery actions (charging, discharging, idle) using a model-free stochastic approach. One significant aspect that sets this work apart from others is its acknowledgment of the non-deterministic nature of the state of charge (SOC) of the battery. Unlike systems that solely rely on grid charging, our approach takes into account the unpredictability of renewable energy sources, particularly solar power, which heavily depends on varying time instances and weather conditions throughout the day. Consequently, the SOC of the battery exhibits non-deterministic behavior due to the uncertainty in the availability of excess renewable energy for charging. The RL-based policy presented in this research capitalizes on the effective utilization of photovoltaic sources, optimizing the battery’s discharge and idle states. By intelligently adapting to the dynamic energy supply from renewable sources, the proposed approach ensures that the battery is charged only when surplus energy is available beyond fulfilling the overall system load demand.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115089426","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

Flexural Strength and Modulus of Elasticity of Concrete Beam Cast with Binary Blending of Recycled Concrete Aggregate and Marble Dust 再生混凝土骨料与大理石粉二元配合比混凝土梁的抗弯强度和弹性模量

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.14

Faizyab Latif

{"title":"Flexural Strength and Modulus of Elasticity of Concrete Beam Cast with Binary Blending of Recycled Concrete Aggregate and Marble Dust","authors":"Faizyab Latif","doi":"10.52584/qrj.2101.14","DOIUrl":"https://doi.org/10.52584/qrj.2101.14","url":null,"abstract":"This research paper presents the combined effect of recycled coarse aggregates and marble dust on the flexural strength and modulus of elasticity of concrete. Use of the waste materials in concrete leads to sustainable development; and is the need of the day. Recycled aggregates were processed from demolishing waste and ensured by sieve analysis for well-graded concrete. Marble dust was used as cement replacement from 2.5% to 10% in increments of 2.5%. Recycled aggregates were used in equal dosage with conventional aggregates. A total of five batches of beams and cubes were cast using normal mix concrete. The curing of the specimens was done for 28 days. Ultrasonic pulse velocity testing was done to evaluate the modulus of elasticity. The same was also evaluated using an empirical equation of ACI and from the literature. A comparison of the results shows that both UPV testing and numerical equation by ACI can comfortably be used for evaluation of the modulus of elasticity of recycled aggregate concrete. Beams were tested under central point load for flexure. Comparison of flexural strength and deflection with control concrete shows that a 5% dosage of marble dust as cement replacement along with 50% replacement of conventional coarse aggregates with coarse aggregates from demolishing waste is optimum as with this replacement level residual flexural strength is 88% and the deflection is only 5% more than control concrete and less compared to the maximum approximate deflection allowed by ACI-31.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"30 38","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120836030","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

Numerical Simulation of One-Dimensional Advection Diffusion Equation by New Hybrid Explicit Finite Difference Schemes 一维平流扩散方程的新混合显式有限差分格式数值模拟

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.07

Abdul Qadir Mugheri

引用次数: 0

The Impact of Urban Heat Island on Cooling Needs in Urban and Suburban Areas of Hyderabad Sindh Pakistan 城市热岛对巴基斯坦信德省海德拉巴城市和郊区制冷需求的影响

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.04

Abdul Rehman Soomro

{"title":"The Impact of Urban Heat Island on Cooling Needs in Urban and Suburban Areas of Hyderabad Sindh Pakistan","authors":"Abdul Rehman Soomro","doi":"10.52584/qrj.2101.04","DOIUrl":"https://doi.org/10.52584/qrj.2101.04","url":null,"abstract":"The urban heat island phenomenon is causing numerous problems, and studying its effects in rapidly developing cities is crucial to meet the Sustainable Development Goal 14 for sustainable building and cities. This research focuses on investigating the characteristics of the Urban Heat Island in Hyderabad Sindh, specifically in a densely populated commercial area and a rural suburb known as TandoJam. The study utilized weather station data from the Pakistan Meteorological Department and temperature sensors from Qasimabad to compare air temperature differences between the urban and reference rural areas. The UHI intensity was determined by calculating the air temperature difference between urban and rural areas. Results showed that the UHI effect was more prominent during winter and nighttime than during summer and daytime, with only a few months, like June, showing some UHI effects during daytime. The study also used cooling degree days and cooling degree hours as a measure of energy required for cooling, and all areas observed higher numbers of CDDs and CDHs. However, urban areas had more CDDs than rural areas, indicating that the maximum cooling degree days in urban areas are a direct consequence of the UHI. The 7-year average data revealed that TandoJam experienced the least number of CDDs compared to its urban area, suggesting better thermal comfort in the rural area. The study’s findings were further validated through a day UHI analysis in the town of Qasimabad Hyderabad, which showed high CDHs and higher UHI intensity in Qasimabad than in other rural towns in Hyderabad.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116122409","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

Review on Cleveland Heart Disease Dataset using Machine Learning 基于机器学习的Cleveland心脏病数据集综述

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.11

Ruqiya

{"title":"Review on Cleveland Heart Disease Dataset using Machine Learning","authors":"Ruqiya","doi":"10.52584/qrj.2101.11","DOIUrl":"https://doi.org/10.52584/qrj.2101.11","url":null,"abstract":"According to the World Health Organization (WHO), heart disease has been a foremost source of death worldwide for the past 15 years. Therefore Medical diagnosis is typically performed mostly by doctors due to their training and experience. In the field of medicine, computer-aided decision support systems are enormously significant. Therefore, it is necessary to develop prediction systems that give information of different categories to readers. According to the study, hybrid intelligent algorithms increase the heart disease prediction system’s accuracy. Hence, recognizing cardiovascular problems including heart attacks, coronary artery diseases, etc. by routine clinical data analysis is an important task; early identification of heart disease may save many lives. In this article, have reviewed various papers related to the Cleveland heart disease dataset that used one or more machine-learning algorithms to forecast congestive heart failure. In one of the above mention papers, the result of utilizing Random Forest is almost 100%. To ensure that predictions made using machine learning algorithms produce accurate outcomes. Applying machine learning algorithms to heart disease treatment data can produce results that are just as accurate as those found in heart disease diagnosis.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"165 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122998354","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

Fabrication and Characterization of Antimony doped Iron oxide Nanoparticles 掺锑氧化铁纳米颗粒的制备与表征

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.08

T. Jamal

引用次数: 0

Effect of Recycled Aggregates and Polymer Modified Bitumen on the Marshall Properties of Hot Mix Asphalt- A Case Study 再生骨料和聚合物改性沥青对热拌沥青马歇尔性能的影响——以热拌沥青为例

Volume 21, Issue 1 Pub Date : 2023-06-30 DOI: 10.52584/qrj.2101.03

Diyar Khan

{"title":"Effect of Recycled Aggregates and Polymer Modified Bitumen on the Marshall Properties of Hot Mix Asphalt- A Case Study","authors":"Diyar Khan","doi":"10.52584/qrj.2101.03","DOIUrl":"https://doi.org/10.52584/qrj.2101.03","url":null,"abstract":"The main objective of this study was to assess the performance and physical properties of hot mix asphalt mixes incorporating recycled aggregates from demolished concrete and compare them with an unmodified hot mix asphalt mixture. Using recycled aggregates offers potential environmental benefits by reducing the load on landfill sites\u0000associated with demolished concrete waste. Hot mix asphalt mixes were prepared using the Marshall mix-design technique, with varying proportions (0%, 25%, 50%, and 75%) of recycled aggregates replacing the coarse virgin aggregates. The resulting mixes were compared to a control sample. It was observed that with an increase in the proportion of recycled aggregates, the stability of the mixes decreased. Additionally, the number of air voids and voids filled by mineral aggregates increased. However, laboratory tests indicated that the recycled aggregates modified mixes exhibited comparable performance to conventional hot mix asphalt mixes while providing improved environmental advantages through the recovery and reuse of waste concrete aggregates. These findings highlight the potential of utilizing recycled aggregates in hot mix asphalt as a sustainable approach in asphalt pavement construction.","PeriodicalId":426146,"journal":{"name":"Volume 21, Issue 1","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122438959","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