Journal of Physical Science最新文献_第8页

Treated Coal Bottom Ash for Palm Oil Mill Effluent (POME) Decolourisation 棕榈油厂废水(POME)脱色处理的煤底灰

IF 0.7

Journal of Physical Science Pub Date : 2019-11-25 DOI: 10.21315/jps2019.30.3.7

S. Saleh, Ghani Wan Azlina Wan Ab Karim, K. L. Soh

引用次数: 5

Growth of Bulk Gallium Nitride Single Crystal by Sodium Flux Method: A Brief Review 钠通量法生长大块氮化镓单晶的研究进展

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.11

Nurul Fatihah Nik Sin, K. Ibrahim, N. Zainal

引用次数: 0

Experimental Investigation of Physical and Mechanical Properties of Steel Powder Filled Disc Brake Friction Materials 钢粉填充盘式制动器摩擦材料物理力学性能试验研究

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.6

Pradnya Kosbe, P. Patil, M. Manickam, Gurunathan Ramamurthy, India Rane Brake Lining Ltd.

{"title":"Experimental Investigation of Physical and Mechanical Properties of Steel Powder\u0000 Filled Disc Brake Friction Materials","authors":"Pradnya Kosbe, P. Patil, M. Manickam, Gurunathan Ramamurthy, India Rane Brake Lining Ltd.","doi":"10.21315/jps2019.30.2.6","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.6","url":null,"abstract":"A suitable selection of a filler material enhances the mechanical and tribological characteristics of brake friction material. There are various types of fillers like organic, inorganic, metallic and natural fibres. Among these various types, metallic fillers are very important as they consist of different functional characteristics of brake friction material. Hence in this work, four friction composites are shown with identical parent composition (65 wt%) and varying steel powder from 0 wt% to 12 wt%, and barite from 35 wt% to 23 wt%, respectively in each composition, i.e., S0, S1, S2 and S3. All these four composites are characterised for physical and mechanical properties according to Indian Standards (IS). The coefficient of friction is investigated using a pin on disc tribometer. Finally, the correlation between physical properties and coefficient of friction is determined. It is concluded that inclusion of steel powder improved almost all the physical and mechanical properties. It is also observed that density, void content and hardness influence the coefficient of friction level.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"27 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78648014","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: 4

Characterisation and Kinetic Studies on Activated Carbon Derived from Rubber Seed Shell for the Removal of Methylene Blue in Aqueous Solutions 橡胶籽壳活性炭去除水溶液中亚甲基蓝的表征及动力学研究

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.1

Nur Fatin Silmi Mohd Azani, Caryn Tan Hui Chuin, N. Abdullah, S. Sharifuddin, M. Hussin

{"title":"Characterisation and Kinetic Studies on Activated Carbon Derived from Rubber Seed\u0000 Shell for the Removal of Methylene Blue in Aqueous Solutions","authors":"Nur Fatin Silmi Mohd Azani, Caryn Tan Hui Chuin, N. Abdullah, S. Sharifuddin, M. Hussin","doi":"10.21315/jps2019.30.2.1","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.1","url":null,"abstract":"The aim of this research is to investigate and identify the absorption capacity of activated carbon derived from a rubber seed shell (RSS). An RSS was prepared through the conduction of a chemical activation process primarily using potassium hydroxide at a ratio of 1:1 followed by carbonisation at 400°C with N2 under a steady flow rate of 1 ml min–1 for 3 h. The produced RSS activated carbon (RSSAC) was characterised using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopyenergy dispersive X-ray (SEM-EDX) spectroscopy, Brunauer-Emmet-Teller (BET) analysis and thermogravimetric analysis (TGA). The SEM image obtained revealed the presence of a highly porous RSSAC surface, with an average pore diameter of 3.35 nm, indicating a mesoporous structure. EDX analysis depicted that C and K were major elements found in RSSAC with a compound percentage of 99.73% and 0.27%, respectively. Batch adsorption studies were conducted to investigate the adsorption properties of RSSAC towards the removal of methylene blue (MB) dye. The optimum dosage of RSSAC was determined to be 5.0 g per 100 ml. Effect of contact time revealed that the highest percentage removal of MB (99.62%) by RSSAC was obtained at a concentration of 100 mg l–1 during a time period of 1 h. In comparison, the effect of pH study affirmed that RSSAC achieved an average removal of 99% of MB in both acidic and basic media at 100 mg l–1. Kinetic studies revealed that the adsorption process abides by the pseudosecond-order kinetic model. Based on the findings by utilising multiple approaches Activated Carbon from Rubber Seed 2 as mentioned, it can be proposed that RSSAC is a viable alternative to act as a green alternative adsorbent.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"95 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76855657","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

First-principles Electronic Study of Metal-insulator Transition in the Rutile CrO2 at Room Temperature 室温下金红石CrO2金属-绝缘体转变的第一性原理电子研究

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.2

S. Biswas

{"title":"First-principles Electronic Study of Metal-insulator Transition in the Rutile CrO2\u0000 at Room Temperature","authors":"S. Biswas","doi":"10.21315/jps2019.30.2.2","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.2","url":null,"abstract":"First-principles electronic structure calculations were employed for the electronic, magnetic and structural properties of rutile CrO2. This material is a ferromagnetic half-metal with a semiconducting gap of 1.85 eV. The sharing of a single electron by Cr-3dyz and dxz orbitals is responsible for the metallic behaviour of CrO2 for the majority spin channel. For the application of on-site Coulomb interaction U up to 4 eV, the electrons in the valence band polarise towards the Fermi level (EF), while the electrons in the conduction band polarise away from EF. The enhanced shifting of conduction bands of the spin minority channel is responsible for the augmentation of the semiconducting spin gap. This system undergoes a metal-insulator transition (MIT) upon the application of U = 5 eV. Due to the presence of electron correlation, the electron in the dxy orbital shifts well below EF, while bonding components of dyz and dxz orbitals are occupied by the remaining single electron. Nevertheless, anti-bonding components of these two states remain unoccupied. Consequently, a band gap of Eg ~ 0.2 eV is opened near EF. The double exchange interactions between the partially occupied Cr-t2g states and p-d hybridisations are responsible for the ferromagnetic behaviour of CrO2 in both halfmetallic and insulating phases.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"40 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91209358","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

3D Printing Filaments Prepared from Modified Poly(Lactic Acid)/Teak Wood Flour Composites: An Investigation on the Particle Size Effects and Silane Coupling Agent Compatibilisation 改性聚乳酸/柚木粉复合材料制备3D打印长丝:粒径效应及硅烷偶联剂增容研究

IF 0.7

Journal of Physical Science Pub Date : 2019-09-15 DOI: 10.21315/jps2019.30.2.10

N. Petchwattana, W. Channuan, P. Naknaen, B. Narupai

{"title":"3D Printing Filaments Prepared from Modified Poly(Lactic Acid)/Teak Wood Flour\u0000 Composites: An Investigation on the Particle Size Effects and Silane Coupling Agent\u0000 Compatibilisation","authors":"N. Petchwattana, W. Channuan, P. Naknaen, B. Narupai","doi":"10.21315/jps2019.30.2.10","DOIUrl":"https://doi.org/10.21315/jps2019.30.2.10","url":null,"abstract":"This study aims to produce the poly(lactic acid) (PLA)/teak wood composite filament for 3D printing application. Prior to the production of the wood plastic composite (WPC) filaments, PLA was modified to remedy the problem of brittleness and low-melt viscosity by core-shell rubber (CSR) particles and acrylic processing aid (APA). Two different particle sizes of teak wood flour (WF) were added to the modified-PLA (mPLA). Silane coupling agent was further added to improve the interfacial adhesion between the hydrophilic WF and hydrophobic mPLA matrix. Experimental results indicated that all formulations could be fabricated as 3D printing filaments. However, the filaments were successfully printed only for the mPLA with 74 μm WF. For 125 μm, the printer nozzle was clogged up with the agglomerated WF. WPC filaments had higher water uptake than those mPLA and neat PLA, but it significantly decreased with the silane compatibilisation. SEM result also confirmed the improvement of the interfacial bonding between mPLA and WF, which facilitated better fibre-matrix stress transfer and improved the overall mechanical strength.","PeriodicalId":16757,"journal":{"name":"Journal of Physical Science","volume":"16 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2019-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82170617","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: 32

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":"1986 1","pages":""},"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

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

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":"1 1","pages":""},"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