Walailak Journal of Science and Technology (WJST)最新文献

{"title":"Isolation and Identification of Cellulolytic Bacteria Symbiont from Various Termites on Different Nest Type in Bukit Baka Bukit Raya National Park, West Kalimantan, Indonesia","authors":"M. Hidayat","doi":"10.48048/WJST.2021.12708","DOIUrl":"https://doi.org/10.48048/WJST.2021.12708","url":null,"abstract":"The microbial symbiotic community in the digestive tract of termites is reportedly influenced by the taxonomy and feeding habit of the host. Both factors are strongly correlated with the nest type. This study aimed to isolate the cellulolytic bacteria from termite’s digestive tract on different nest types and characterize and identify the potential isolates. The research methods included termite sampling conducted in Bukit Baka Bukit Raya National Park (BBBRNP), Melawi, West Kalimantan, isolation of cellulolytic bacteria from termites’ gut, endoglucanase activity test, biochemical characterization, and DNA analysis based on the amplification of 16S rRNA gene. Thirty isolates from 6 different species of termites on three different nest types were successfully isolated. Sixteen potential endoglucanase bacterial isolates were tested in terms of their endoglucanase activity. The cellulolytic index measured from those isolates ranged from 1.162 - 4.894. Three isolates (MRH.13.S, MRH.13.AF, and MRH.13.O2) with the highest cellulolytic index on each nest type were identified. The analysis of 16S rRNA gene using BLAST (Basic Local Alignment Search Tool for Nucleotides) revealed that isolate MRH.13.S had the closest relationship with Bacillus tequilensis (99 % homology). Based on biochemical characterization, MRH.13.AF and MRH.13.O2 isolates were related to Bacillus spp.\u0000HIGHLIGHTS\u0000\u0000Potential cellulolytic bacteria from termite intestinal tract from different nests (i.e., soil, wood, and arboreal) were isolated and compared\u0000Termites were obtained from a lowland dipterocarp primary forest ecosystem in Bukit Baka Bukit Raya National Park, West Kalimantan Province, Indonesia\u0000Termite species collected were Termes comis, Dicuspiditermes garthwaitei, Synhamitermes quadriceps, Havilanditermes proatripennis, Bulbitermes borneensis, and Bulbitermes parapusillus\u0000Potential cellulolytic bacteria acquired were closely related with Bacillus tequilensis and Bacillus spp\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130068382","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}

{"title":"Real-Time Prediction of the COVID-19 Epidemic in Thailand using Simple Model-Free Method and Time Series Regression Model","authors":"R. Wongsathan","doi":"10.48048/wjst.2021.10028","DOIUrl":"https://doi.org/10.48048/wjst.2021.10028","url":null,"abstract":"The novel coronavirus 2019 (COVID-19) pandemic was declared a global health crisis. The real-time accurate and predictive model of the number of infected cases could help inform the government of providing medical assistance and public health decision-making. This work is to model the ongoing COVID-19 spread in Thailand during the 1st and 2nd phases of the pandemic using the simple but powerful method based on the model-free and time series regression models. By employing the curve fitting, the model-free method using the logistic function, hyperbolic tangent function, and Gaussian function was applied to predict the number of newly infected patients and accumulate the total number of cases, including peak and viral cessation (ending) date. Alternatively, with a significant time-lag of historical data input, the regression model predicts those parameters from 1-day-ahead to 1-month-ahead. To obtain optimal prediction models, the parameters of the model-free method are fine-tuned through the genetic algorithm, whereas the generalized least squares update the parameters of the regression model. Assuming the future trend continues to follow the past pattern, the expected total number of patients is approximately 2,689 - 3,000 cases. The estimated viral cessation dates are May 2, 2020 (using Gaussian function), May 4, 2020 (using a hyperbolic function), and June 5, 2020 (using a logistic function), whereas the peak time occurred on April 5, 2020. Moreover, the model-free method performs well for long-term prediction, whereas the regression model is suitable for short-term prediction. Furthermore, the performances of the regression models yield a highly accurate forecast with lower RMSE and higher R2 up to 1-week-ahead.\u0000HIGHLIGHTS\u0000\u0000COVID-19 model for Thailand during the first and second phases of the epidemic\u0000The model-free method using the logistic function, hyperbolic tangent function, and Gaussian function  applied to predict the basic measures of the outbreak\u0000Regression model predicts those measures from one-day-ahead to one-month-ahead\u0000The parameters of the model-free method are fine-tuned through the genetic algorithm \u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126070469","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}

{"title":"CMOS Realizable and Highly Cascadable Structures of First-Order All-Pass Filters","authors":"Jitender Jitender, J. Mohan, B. Chaturvedi","doi":"10.48048/WJST.2021.21451","DOIUrl":"https://doi.org/10.48048/WJST.2021.21451","url":null,"abstract":"Two novel resistorless structures of a first-order voltage-mode all-pass filter are presented in the paper. Both the structures employ a fully differential second-generation current conveyor (FDCCII) as the primary active element, in addition to an active resistor. A grounded capacitor is the only passive component used in both the structures. In both the structures, CMOS realization of FDCCII is utilized; hence, these structures are CMOS compatible. Some of the other highly demanded features possessed by the presented all-pass structures are: a simple circuit topology, electronic tunability, high input impedance, constraint-free operation in terms of passive component matching, and low sensitivity figures. The theoretical performances under ideal and non-ideal scenarios are presented in detail. Furthermore, the proposed idea is extended to an Nth-order voltage-mode all-pass filter and a quadrature oscillator to explore some of the possible applications. PSPICE simulation results verify the theoretical claims of the presented all-pass filters. \u0000HIGHLIGHTS \u0000 \u0000Two novel resistorless structures of first-order all-pass filters based on fully differential second-generation current conveyor are presented \u0000Performance of the proposed structures are thoroughly described in ideal and non-ideal scenarios \u0000Theoretically described details of the proposed structures are verified by carrying simulations on PSPICE using 180 nm CMOS technology \u0000An Nth-order all-pass filter and a quadrature oscillator are also presented as applications \u0000 \u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116572391","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}

{"title":"Changes in Physico-Chemical and Microbiological Properties in Thai Cocoa Bean Fermentation","authors":"Tiparat Tikapunya","doi":"10.48048/WJST.2021.21443","DOIUrl":"https://doi.org/10.48048/WJST.2021.21443","url":null,"abstract":"The purpose of this research is to investigate the quality-related physical, chemical, and microbiological changes in Thai cocoa beans during fermentation in 2 types of wooden containers. The results will compose a book of guidelines for good Thai cocoa fermentation in order to educate Thai farmers. Fresh Thai cocoa beans have a low pH value (5.0 - 5.5) compared to those from other countries in general (6.0 - 7.0). However, fermented temperature is able to reach 40 - 45 °C in 6 days, which is a main criteria for finishing cocoa fermentation. The color of fresh cocoa beans changes from white to brown within 2 days; after that, cocoa beans are mixed from the top to the bottom of the containers. Three groups of microorganism are evaluated with 3 different sampling points in wooden containers. The results reveal that yeast is grown quickly in 2 days on the top of containers, and then acetic acid bacteria and lactic acid bacteria are grown by the utilized yeast’s metabolites. These behaviors were found in both of the 2 wooden containers; however, a heap of cocoa beans (200 - 250 kgs) in a wooden box showed better quality of cocoa fermentation than a small volume (40 - 50 kgs) in a wooden tray. \u0000HIGHLIGHTS \u0000 \u0000Understanding changes in Thai cocoa beans fermentation based on traditional method \u0000Two type of wooden containers applied for comparing all quality-related cocoa fermentation \u0000Proper cocoa beans fermentation process composed to a book of guideline for Thai Farmers \u0000 \u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133153352","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}

{"title":"Simulations of High Non-Uniform Electric Field in Dielectric Barrier Electrode System","authors":"Pitchasak Chankuson, M. Nisoa","doi":"10.48048/WJST.2021.12953","DOIUrl":"https://doi.org/10.48048/WJST.2021.12953","url":null,"abstract":"An electric field in the dielectric barrier electrode system is necessary for ozone production because ozone is produced by the electric discharge of O2 under a high-intensity electric field. The gas discharge plasmas contain energetic particles, such as electrons, ions, atoms, and radicals. The recombination of the O atom and O2 in the plasma will form O3. In this paper, the dependence of DC electric field formation on electrode geometry and the gap between electrodes and dielectric materials were examined by using computational modeling. Thus, a set of electrode geometry, gap distance, and dielectric material were obtained for high-intensity and uniform electric field generation. The COMSOL Multiphysics software was used for the modeling. Among the electrode geometries of plate-plate, pin-plate and mesh-plate, the mesh-plate generated high-intensity and uniform electric field. In the modeling, dielectric materials, including quartz, mica, alumina, and water, were compared. The highest intensity of electric field occurred on the water surface.\u0000HIGHLIGHTS\u0000\u0000When the gap distance between two parallel electrodes is less than 100 mm, the electric field in the gap is constant, independent of the space\u0000A high-intensity and uniform electric field is generated in the gap between the dielectric and grounded electrodes when a fine mesh high-voltage electrode is utilized\u0000With the fine mesh electrode, the electric field is about two times higher than the conventional plate electrodes, whereas the electric field uniformity was about 90 %. Therefore the barrier discharge will be initiated with lower high voltage\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128012728","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}

{"title":"Enrichment a Study of Structural, Optical and Dielectric Properties of Mowiol 4-88 (Pva) Filled Zno Nanocomposites","authors":"Sahebagouda Jambaladinni, J. S. Bhat","doi":"10.48048/WJST.2021.21445","DOIUrl":"https://doi.org/10.48048/WJST.2021.21445","url":null,"abstract":"The use of ZnO nanoparticles in the fabrication of PVA (Mowiol 4-88) nanocomposites with different ‘x’ filling compositions through solvent casting technique leading to the enrichment of the host's physical properties is presented. The sol-gel approach synthesizes Zinc Oxide (ZnO) nanoparticles. The formation of ZnO nanoparticles of size 100 nm was confirmed through X-ray powder diffraction (XRD) and Field Effect Scanning Electron Microscope (FESEM) techniques. The XRD technique determines the appearance of nanocomposites and their structural properties. The improvement in filling concentration enhances the particle size up to 150 nm and percentage crystallinity by 41 % for optimum filler composition. The FTIR spectra demonstrate ZnO nanofillers' binding with OH group of host Mowiol 4-88 through intra or inter hydrogen bonding leading to a complex conformation. The optical studies indicate a decrease in the energy gap with the rise in filler composition up to 15 wt%, and frequency-dependent dielectric constant characterization shows the enhancement in the dielectric constant with an optimum filling concentration 15 wt% ZnO nanofillers. FESEM image confirms homogenous distribution and complex particle size of incorporated ZnO nanoparticles in the PVA matrix.\u0000HIGHLIGHTS\u0000\u0000ZnO nanoparticles with Fabrication of PVA (Mowiol 4-88) nanocomposites through solvent casting technique\u0000ZnO nanoparticles of size 100 nm was confirmed\u0000Filling concentration enhances the particle size and percentage crystallinity\u0000SEM and EDS illustrate ZnO nanofiller’s systematic distribution\u0000Dielectric measurements show that these fabricated polymeric composites are polar\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"208 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133830641","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}

{"title":"Analysis of Platelet Shape Al2O3 and TiO2 on Heat Generative Hydromagnetic Nanofluids for the Base Fluid C2H6O2 in a Vertical Channel of Porous Medium","authors":"S. Hazarika, Sahin Ahmed, Ali J. Chamkha","doi":"10.48048/WJST.2021.21424","DOIUrl":"https://doi.org/10.48048/WJST.2021.21424","url":null,"abstract":"An analytical investigation is performed on the unsteady hydromagnetic flow of nanoparticles Al2O3 and TiO2 in the EG base fluid through a saturated porous medium bounded by two vertical surfaces with heat generation and no-slip boundary conditions. The physics of initial and boundary conditions is designated with the flow model's non-linear partial differential equations. The analytical expressions of nanofluid velocity and temperature with the channel are derived, and Matlab Codes are used to plot the significant results for physical variables. From the physical point of view for nanofluid velocity and temperature results, the base fluid C2H6O2 has a higher viscosity and thermal conductivity than that of water. Physically, the platelet shape Al2O3 nanofluid has the highest velocity than TiO2 nanofluid. It is found that the velocity of nanofluid enhanced the porosity and nanoparticles volume fraction for Al2O3 - EG and TiO2 - EG base nanofluids. However, this trend is reversed for the effects of heat generation. Obtained results indicate that an increase in nanoparticles volume fraction raises the skin friction near the surface, but profiles gradually become linear, due to less frictional effects of nanoparticles. Moreover, due to higher values of nanoparticles volume fraction, the thermal conductivity is raised, and thus the thickness of the thermal boundary layer is declined. The results show that the method provides excellent approximations to the analytical solution of nonlinear system with high accuracy. Metal oxide nanoparticles have wide applications in various fields due to their small sizes, such as the pharmaceutical industry and biomedical engineering.\u0000HIGHLIGHTS\u0000\u0000Impact of platelet shape Al2O3 and TiO2 for base fluid C2H6O2 is studied\u0000In Couette and Poiseuille flow, nanoparticles play a vital role to enhance the heat transfer\u0000The infinite series solution has been used for solving the non-linear PDE’s\u0000The uses of Al2O3 and TiO2 in significant heat transfer applications is overviewed\u0000The physiochemical and structural features of metal oxide nanoparticles have diverse biomedical applications\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129350389","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}

{"title":"Nutritional Values of Tung Samrit Jasmine Rice for Geographical Indication in Nakhon Ratchasima Province","authors":"Wassana Phanurak","doi":"10.48048/WJST.2021.9352","DOIUrl":"https://doi.org/10.48048/WJST.2021.9352","url":null,"abstract":"The nutrition values of jasmine rice, i.e., Khao Dowk Mali (KDM) 105, from the Tung Samrit area covering 14 districts of Nakhon Ratchasima province of Thailand, were analyzed during the production seasons in 2015 and 2016. The analyzed values involved moisture, carbohydrate, protein, fat, energy, ash, vitamin E, vitamin B1, niacin B3, iron, zinc, and 2-acetyl-1-pyrroline (2-AP) contents. One of the values, 2-AP, a major aroma compound, showed significantly higher the other kinds of rice (2.71±0.05 (mg/100 g)). The comparison to the literature suggests that the rice product from the Tung Samrit area is up to the national standard. In addition to the use in the documentation for the geographical indication (GI) registration, the collaborated plans and policy were derived with the participation of farmers, dealers, and government agencies to promote sustainable “Tung Samrit jasmine rice”.\u0000HIGHLIGHTS\u0000\u0000Estimation of nutrition values of jasmine rice collected from the Tung Samrit area covering\u000014 districts of Nakhon Ratchasima province of Thailand\u0000Highly accumulation of 2-AP in Tung Samrit jasmine rice\u0000Tung Samrit jasmine rice is promote to Thailand geographical indication\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125475747","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}

{"title":"Effects of Plasma Focus on Seed Germination and Seedling Growth of 14 Thai Rice Varieties","authors":"V. Puripunyavanich, A. Tamman, P. Orpong, R. Picha, Mayuree Limtiyayothin, Pasit Wonghabut, Wutthichok Sangwang, Kewalee Nilgumhang, J. Promping","doi":"10.48048/WJST.2021.12051","DOIUrl":"https://doi.org/10.48048/WJST.2021.12051","url":null,"abstract":"Thailand Plasma Focus 2 (TPF-2) is operated at 2.16 kJ of storage energy with argon as a filled gas and can emit sharp x-ray pulses to plant cells in nanosecond (10-9 s) duration. The effects of plasma focus x-ray on seed germination and seedling growth of 14 Thai rice varieties treated under 10 conditions; 0 (control), 2, 4, 6, 8, 10, 12, 14, 16, and 18 plasma focus shots, were investigated. The results show that the germination rates and growth reduction rates were significantly different among the rice varieties. The germination rate of 10 varieties (Jek Chuey, KDML105, LPT123, PTT1, RD41, RD47, RD49, RD67, RD79, and SPR2) decreased when treated with a high number of plasma focus shots. LD50 and GR50 values were calculated, except for KTH17, RD1, RD7, and RD31 whose germination only slightly decreased, or remained constant, even after they were treated by 18 plasma focus shots.\u0000HIGHLIGHTS\u0000\u0000Effects of plasma focus irradiation on germination and growth were assessed on 14 Thai rice varieties \u0000Shoot and root lengths of rice seedlings were measured 10 days after of plasma treatment\u0000Plasma focus was operated at 12 kV and the number of plasma focus shots was varied from 0 (control) to 18 shots\u0000Sensitivity to plasma irradiation was found to differ among rice seeds tested\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129726660","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}

{"title":"Experimental Study About Water Saturation Influence on Changes in Reservoirs Petrophysical Properties","authors":"S. Al-Obaidi, V. Smirnov, H. Alwan","doi":"10.48048/wjst.2021.20594","DOIUrl":"https://doi.org/10.48048/wjst.2021.20594","url":null,"abstract":"Experimental determination of the physical properties of rocks under conditions simulating in situ reservoir conditions is of great importance both for the calculation of reserves and for the interpretation of well logging data. In addition, it is also important for the preparation of hydrocarbon field development projects. The study of the processes of changes in the petrophysical properties of the reservoir under controlled conditions allows not only to determine their reliability but also to evaluate the dynamics of these changes depending on the temperature and pressure conditions of the reservoir and the water saturation of the rocks.\u0000In this work, an evaluation of the dependence of the physical properties of hydrocarbon reservoirs on their water saturation (Sw) was carried out. Residual water saturation (Swr) was created in the rocks and the properties of these rocks were compared at the states of partial (25 %) and complete water saturation (100 %). The changes in petrophysical parameters of partially water saturated rocks during the increase in effective pressure were studied and estimates of these changes were obtained. The results showed that when the effective pressure is increased, the Swr increases by an average of 6 % compared to atmospheric conditions. This is accompanied by an increase in the velocity of longitudinal (by 51.9 % on average) and lateral waves (by 37.1 % on average). As residual water saturation increases, effective permeability decreases for both standard and reservoir conditions, with, gas permeability decreasing for both dry samples (by 23 % on average) and samples with residual water saturation (effective permeability decreases by 27 % on average).\u0000HIGHLIGHTS\u0000\u0000Changes in physical properties of hydrocarbon reservoirs by determining physical properties (permeability, porosity, elastic, electrical, deformation strength) under the standard conditions and in physical modelling of reservoir conditions and processes\u0000Assessment of the effectiveness of water saturation on the physical properties of the reservoir\u0000Comparisons between the petrophysical properties of reservoir core samples in which the pore space is fully saturated with the reservoir fluid model and samples with residual water saturation\u0000Experimental determination of the physical properties of rocks under conditions simulating in situ reservoir conditions\u0000Estimation of the changes in petrophysical parameters of partial water-saturated rocks during the increase in effective formation pressure\u0000\u0000GRAPHICAL ABSTRACT","PeriodicalId":255195,"journal":{"name":"Walailak Journal of Science and Technology (WJST)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124991241","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}