Journal of Physical Science最新文献_第9页

Evaluation of Excess Lifetime Cancer Risk Due to Gamma Rays Exposure from Phosphate Fertilisers Used in Saudi Arabia 沙特阿拉伯使用的磷肥的伽马射线暴露导致的过量终生癌症风险的评估

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.5

Fatimh Alshahri

{"title":"Evaluation of Excess Lifetime Cancer Risk Due to Gamma Rays Exposure from Phosphate\u0000 Fertilisers Used in Saudi Arabia","authors":"Fatimh Alshahri","doi":"10.21315/jps2019.30.2.5","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.5","url":null,"abstract":"Activity concentrations were measured in phosphate fertilisers widely used in Saudi Arabia employing gamma ray spectrometry. The activity concentrations of 238U, 232Th and 40K were used to estimate the excess lifetime cancer risk (ELCR). The obtained data show that 238U and 40K concentrations are higher than the recommended values (35 Bq kg–1 and 400 Bq kg–1 for 238U and 40K, respectively) in most of phosphate fertilisers. The highest value of 238U was 4122 ± 82 Bq kg–1 for diammonium phosphate (DAP) fertiliser. Absorbed dose rate, annual effective dose rate and the ELCR were calculated. The results revealed that the values of outdoor, indoor and total ELCR values were higher than the world averages in all samples except one sample, sample of MAP fertiliser (monoammonium phosphate). The highest value of ELCRtot was for DAP fertiliser which is 50 times higher than the world average value (1.45 × 10–3). Moreover, the results indicated a strong correlation between uranium in phosphate fertilisers and ELCRtot. Based on the obtained results, the direct gamma radiation exposure from phosphate fertilisers is a serious radiological threat to the farmers.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90334595","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

Correlation between the Track Density and Absorbance of Alpha Particles using CR-39 Detectors from UV-Visible Spectrum CR-39紫外-可见光谱α粒子径迹密度与吸光度的相关性

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.3

A. Ridha, Nada Farhan Kadhim, Nadheer Jassim Mohammed

引用次数: 2

Volumetric and Viscometric Studies of Copper Surfactant Derived from Karanj (Pongamia pinnata) Oil in Methanol-benzene Mixture at 298.15 K 298.15 K甲醇-苯混合液中从卡兰油中提取的铜表面活性剂的体积和粘度研究

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.4

Shema Khan, Rashmi Sharma, A. Sharma

{"title":"Volumetric and Viscometric Studies of Copper Surfactant Derived from Karanj\u0000 (Pongamia pinnata) Oil in Methanol-benzene Mixture at 298.15 K","authors":"Shema Khan, Rashmi Sharma, A. Sharma","doi":"10.21315/jps2019.30.2.4","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.4","url":null,"abstract":"The density, molar volume, apparent molar volume, viscosity and other parameters of Cu(II) surfactant derived from karanj oil in non-aqueous solvents of varying compositions have been determined at constant temperature 298.15 K. The results were used to determine the critical micelle concentration (CMC), soap-solvent interactions and the effect of chain length of the surface active molecule on various parameters. The CMC values of copper karanj soap solutions decreased with the increase in the concentration of polar solvent methanol in the solvent mixture. These studies were done to study the solution behaviour, micellar features and various interactions of the derived biologically active surfactant with polar and non-polar solvents to understand the applied part of the molecule. The apparent molar volume has been examined in terms of Masson equation, and the limiting apparent molar volume has been interpreted in terms of solute-solvent interaction. The detailed study of aforesaid compounds clearly indicates that the solutesolvent interaction decreases with the increase in ring strain and size of the synthesised complexes. The conclusions with regard to solute-solute and solute-solvent interaction have been discussed in terms of well-known Moulik’s and Jones-Dole equations. This vital information plays an important role in the selection of the synthesised molecule for various industrial and biological applications.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89988083","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

Guava Leaves as Adsorbent for the Removal of Emerging Pollutant: Ciprofloxacin from Aqueous Solution 番石榴叶作为吸附剂去除水溶液中新出现的污染物环丙沙星

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.8

Chin Tay, S. Ong

引用次数: 6

Kinetic Study of Cd(II) Ions Extraction Using Trioctylamine as Carrier in Bulk Liquid Membrane (BLM) 体积液膜中三辛基胺为载体萃取Cd(II)离子的动力学研究

IF 0.7

Journal of Physical Science Pub Date : 2019-08-25 DOI: 10.21315/jps2019.30.2.9

M. M. H. S. Buddin, Nur Athirah Azrai, Effi Aidur Roza Roseli, Farhana Wahet, A. Ahmad

{"title":"Kinetic Study of Cd(II) Ions Extraction Using Trioctylamine as Carrier in Bulk\u0000 Liquid Membrane (BLM)","authors":"M. M. H. S. Buddin, Nur Athirah Azrai, Effi Aidur Roza Roseli, Farhana Wahet, A. Ahmad","doi":"10.21315/jps2019.30.2.9","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.9","url":null,"abstract":"of ions extraction using trioctylamine as in ABSTRACT: Simultaneous extraction and stripping of Cd(II) ions from aqueous solution by using bulk liquid membrane (BLM) was explored. This study was aimed to identify the conditions to achieve maximum Cd(II) ions removal and the reaction kinetics was thoroughly analysed. The membrane phase was made by using trioctylamine (TOA) and kerosene, as carrier and diluent, respectively. Meanwhile, the feed phase contained the targeted solute (CdCl 2 ) dissolved in a pH adjusted solution while ammonia was used as the stripping agent. To achieve maximum Cd(II) ions removal, the effect of carrier concentration, stirring speed as well as extraction time were studied. Experimental data obtained shows that 0.1 wt% TOA in kerosene, 400 rpm stirring speed and 4 h of extraction time resulted in highest removal of Cd(II) ions. Furthermore, it was identified that the extraction process across BLM prefers acidic condition (pH of 1). The capability of the system to extract Cd(II) ions from the feed phase was known by using dimensionless reduced concentration, R f where the maximum removal of Cd(II) ions achieved was 0.0193 at the mentioned conditions. The reaction kinetics were investigated to identify the reaction rate constants for extraction reaction (k 1 ) and stripping reaction (k 2 ). The value of k 1 and k 2 were found to be 0.94 h –1 and 2.45 h –1 , respectively.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90182324","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

Functionalised Multi-walled Carbon Nanotubes/Cellulose Acetate Butyrate Mixed Matrix Membrane for CO2/N2 Separation 功能化多壁碳纳米管/醋酸丁酸纤维素混合基质膜用于CO2/N2分离

IF 0.7

Journal of Physical Science Pub Date : 2019-08-25 DOI: 10.21315/jps2019.30.2.7

S. Lee, J. Pang, Z. Jawad

{"title":"Functionalised Multi-walled Carbon Nanotubes/Cellulose Acetate Butyrate Mixed\u0000 Matrix Membrane for CO2/N2 Separation","authors":"S. Lee, J. Pang, Z. Jawad","doi":"10.21315/jps2019.30.2.7","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.7","url":null,"abstract":"The emission of greenhouse gases (GHGs), especially carbon dioxide (CO2), has been rising indiscriminately causing serious global warming issues. Therefore, to prevent severe consequences of global warming, stern efforts need to be taken to minimise the global GHG emission. One of the most suitable approaches chosen for removal of CO2 is the gas separation membrane technology. The main objective of this work is to synthesise a membrane with good CO2 permeance and CO2/nitrogen (N2) selectivity that can be applied in the industry. Firstly, the cellulose acetate butyrate (CAB) polymer matrix of molecular weight (Mn) 65000 was used to synthesise the membranes with different solvent evaporation times (4 min, 5 min and 6 min) and different solvent exchange drying times (15 min, 30 min and 60 min). Since the performance of the obtained CAB membrane performance was still relatively low (CO2/N2 selectivity of 0.978 ± 0.011), the mixed matrix membranes (MMMs) were introduced. The MMM was fabricated by using 4 wt% of CAB polymer of molecular weight (Mn) 65000 and 0.1 wt% of functionalised multi-walled carbon nanotubes (MWCNTs-F). In addition, the effect of different MWCNT loadings (0.2 wt% to 1.2 wt%) and acetyl contents (12 wt%–15 wt% and 28 wt%–31 wt%) on CO2/N2 separation were also investigated. The results proved that the MMM prepared from the CAB polymer of Mn 65000 and 0.1 wt% of MWCNTs with higher acetyl content, i.e., from 28 wt% to 31 wt% had better performance in terms of CO2/N2 selectivity (2.887 ± 0.068).","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80952274","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: 9

Polarizability of Exciton in Surface Quantum Well 表面量子阱中激子的极化率

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.4

A. Anitha, M. Arulmozhi

{"title":"Polarizability of Exciton in Surface Quantum Well","authors":"A. Anitha, M. Arulmozhi","doi":"10.21315/JPS2019.30.1.4","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.4","url":null,"abstract":"Surface quantum wells are seeking considerable attention due to their asymmetrical nature of polarized interface and its consequences. Their results with and without external perturbations are expected to be remarkably different from their counterparts in symmetrical quantum wells. Effect of electric field on binding energies of light hole and heavy hole exciton in surface quantum well composed of vacuum/GaAs/Ga1xAlxAs are theoretically calculated as a function of well width and Al composition. Effect of image charges arising due to the mismatch of the dielectric constant at the vacuum/GaAs interface is considered. Stark shift and polarizability of exciton in this surface quantum well is also calculated for various strengths of electric field with different well width confinement as well as Al concentration. Our results show that: (1) exciton binding energy increases as the electric field applied along the growth axis increases; (2) stark shift in exciton energy decreases as electric field, Al composition and well width increase; and (3) polarizability of exciton decreases when the electric field increases, but increases when well width increases. Variation of our results with those for other symmetrical wells will provide a choice of the well for electric field applications.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78972616","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

Formation of Low Acetyl Content Cellulose Acetate Membrane for CO2/N2 Separation 低乙酰基含量醋酸纤维素膜用于CO2/N2分离的研究

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.9

Lavania Sugu, Z. Jawad

{"title":"Formation of Low Acetyl Content Cellulose Acetate Membrane for CO2/N2 Separation","authors":"Lavania Sugu, Z. Jawad","doi":"10.21315/JPS2019.30.1.9","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.9","url":null,"abstract":"The rising carbon dioxide (CO2) emissions over the decades is known to be a huge contributor to the greenhouse effect. CO2 capture and storage methods have been perceived as favourable solutions to prevent global warming and climate change rising from the greenhouse effect. One energy efficient technology for separating CO2 is the development of high-performing CO2 gas separating membranes. A variety of membrane-based gas separation technologies designed have shown promising results and are inexpensive. A high-performing membrane must have a defect-free, thin dense skin-layer with a porous sub-layer for support that permits great permeation rate and selectivity. Of all ranges of polymers used to make polymeric membranes for CO2/nitrogen (N2) separation, cellulose acetate (CA) polymer membranes are known for their high CO2 solubility. In this research, the effect of CA polymer concentrations at low acetyl group of 39.8% and casting thickness on the structure and morphologies of the membranes were studied. The CA polymer concentration was optimised from a range of 10 wt%, 15 wt% and 20 wt%, and the casting thickness was optimised from a range of 150 μm to 400 μm using wet-phase inversion technique. The results obtained exhibit a CA membrane with thin dense, selective skin-layer achieved at CA polymer concentration of 15 wt% and a casting thickness of 300 μm, with a CO2 permeance rate of 401.173 ± 0.579 (GPU), N2 permeance rate of 133.499 ± 0.148 (GPU) and selectivity of 3.009 ± 0.00656. This CA membrane is able to contribute to promising gas separation performances with enhanced physical and mechanical support by improvement of membrane permeance and selectivity towards CO2/N2 separation performance.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84128218","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

Utilisation of Seismic Refraction Method in Producing Shale Topography Map of Sungai Batu Ancient River 地震折射法在双盖拔图古河流页岩地形图制作中的应用

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.12

S. Anda, R. Saad, M. Saidin, F. Andika, S. Muhammad, R. Yusoh

{"title":"Utilisation of Seismic Refraction Method in Producing Shale Topography Map of Sungai Batu Ancient River","authors":"S. Anda, R. Saad, M. Saidin, F. Andika, S. Muhammad, R. Yusoh","doi":"10.21315/JPS2019.30.1.12","DOIUrl":"https://doi.org/10.21315/JPS2019.30.1.12","url":null,"abstract":"Geophysical methods have been widely used in archaeological prospecting for decades. This is for the fact that the methods provide a great deal of information for archaeologist to determine buried evidences beneath the surface. Geophysical methods are also cost effective, covering much larger area at relatively lower costs, compared with the conventional archaeological probing techniques. The methods are also non-destructive and non-invasive, keeping archaeological sites entirely undisturbed after survey. Several geophysical methods including resistivity, magnetic, gravity, ground penetrating radar and electro-magnetic are usually implemented to map out the archaeological evidences. It is often believed that the seismic refraction method may not be suitable when looking for anomalies of archaeological remains. However, since the purpose of this study is to delineate the boundary of shale to locate the ancient river, seismic refraction can give the very much desired result. The study was conducted at Sungai Batu, Kedah, Malaysia, which is famously known for its archaeological sites, including an ancient international entrepot. The discovery of jetty remains within the study area is also indicative of the existence of ancient river. The results obtained showed that the shale (suspected riverbed) are characterised with P-wave velocity of > 1822 m s–1. The suspected ancient river was determine based on a ravine shape that Topography Map of Sungai Batu 170 observed. It is believed that shale which is found at a depths of > 15 m is categorised as ancient river bed. It is concluded that the ancient river was probably flowing from NorthSouth direction towards East.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2019-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77175160","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

Optimising Aged Nanostructured Nickel Oxide Thin Films for Solar Cells Fabrication 优化老化纳米结构氧化镍薄膜用于太阳能电池的制造

IF 0.7

Journal of Physical Science Pub Date : 2019-05-15 DOI: 10.21315/JPS2019.30.1.1

K. Ukoba, F. Inambao, A. Eloka‐Eboka

引用次数: 1