Effect of pH variation on magnetic properties of strontium hexaferrite nanoparticles synthesized by sol gel process

A strontium ferrite (SrFe12O19) nanoparticle was prepared by sol gel auto combustion method at 800°C and 900°C and at various pH (pH 1, 3 and 5). The SrFe12O19 powder was characterized by using Thermogravimetric analyses (TGA), X-Ray Diffraction (XRD), Vibrating Sample Magnetometer (VSM), and Field emission Scanning Microscope (FeSEM) to investigate thermal behavior, crystalline structure, magnetic properties and morphology. To review, the single crystal size of SrFe12O19 was found at 900°C has lower weight loss about 30.44%, crystalline size of 70.5 nm with Mr, Ms, and Hc were 64036 G, 44.188 emu/g and 27.593 emu/g. The average grain size was 80 ~ 100 nm. In brief, as pH increase, the Mr, Ms and Hc were increases

Effect of polypropylene fibre on cementitious mortar early shrinkage cracking using the eccentric-ring test

The effects of polypropylene fibres on mortar and cement-paste cracking were investigated using different amounts of fibre fractions and eccentric rings under restrained-shrinkage conditions. Eccentric-ring tests were conducted to investigate early-age shrinkage cracks. The characteristics of restricted cementitious materials were described by evaluating the cracking time and using concrete mixtures that are less likely to crack. Different fibre-volume fractions significantly enhanced the width, area, and age of cracking. Increasing the water-cement ratio and sand percentage increased the cracking age. The eccentric-ring test showed a greater susceptibility to cracking in cement-mortar composites. The mechanical strength was assessed, and the impact of polypropylene fibres was investigated

Extent of Application of Green Productivity Standards in Al- Sumoud Refinery in Baiji: Case Study

The studys objective is to ascertain the proportion of implemented green productivity standards, identify implemented green productivity standards, and identify deficiencies in Al-Sumoud Baiji Refinerys dedication to enhancing productivity and safeguarding the environment in crude oil refining. The data was gathered via on-site visits to businesses, direct observation of work activities, and personal interviews conducted with engineers, chemists, and administrative personnel. The primary results suggest that the Al-Sumoud Baiji Refinery has demonstrated a favorable inclination toward diminishing solid and gaseous waste, thereby decreasing environmental harm and decreasing environmental harm and enhancing production. The adoption of green productivity standards is commendable, with the highest level of employee participation suggesting a strong awareness among workers about minimizing pollution and industrial emissions. Refinery management offers education courses to foster this awareness. This strategy mitigates adverse environmental effects and enhances productivity in oil refining

VERIFICATION FOR MODELING OF ULTIMATE LOAD FOR LIGHTWEIGHT PALM OIL CLINKER REINFORCED CONCRETE BEAMS WITH WEB OPENINGS USING RESPONSE SURFACE METHODOLOGY

ABSTRAC

INCEPTION OF 3Es IN PROMOTING DISASTER RESILIENT COMMUNITIES LIVING NEAR HYDROPOWER DAMS OF PENINSULAR MALAYSIA

Excessive rain pattern has been the major cause contributing to flooding of low land due to excess water release from affected dams. This deliberate measure has to be taken to prevent the catastrophic effect of a dam break scenario. Therefore, this kind of disaster is considered as a local phenomenon. The local communities are the vulnerable population to face the immediate impact of such disaster. Needless to mention that they are also first emergency responders which is crucial for saving lives. It is therefore imperative for the involved stakeholders to improve local communities’ resilience to dam related disasters. This resonates well with the Hyogo Framework for Action, which identify local communities as integral cornerstone for saving lives and livelihoods. In the case of communities living near main hydropower dams owned by Tenaga Nasional Berhad, an initiative known as Integrated Community Based Disaster Management (ICBDM) has been launched in May 2015. This initiative adopts the concept of 3Es; embrace, educate and empower. The priority is to ensure the vulnerable communities embrace the reality, being educated to face any upcoming situation as well as being empowered to take charge of immediate live saving efforts in the future. The initiative involves five key scopes encompassing technical and non-technical areas and promotes the strategic partnerships between dam owner, authority and the community. It is anticipated that this initiative will build the resilience of communities to dam related disaster

Extent of application of green productivity standards in AlSumoud Refinery in Baiji: case study

The study's objective is to ascertain the proportion of implemented green productivity standards, identify implemented green productivity standards, and identify deficiencies in Al-Sumoud Baiji Refinery's dedication to enhancing productivity and safeguarding the environment in crude oil refining. The data was gathered via on-site visits to businesses, direct observation of work activities, and personal interviews conducted with engineers, chemists, and administrative personnel. The primary results suggest that the Al-Sumoud Baiji Refinery has demonstrated a favorable inclination toward diminishing solid and gaseous waste, thereby decreasing environmental harm and decreasing environmental harm and enhancing production. The adoption of green productivity standards is commendable, with the highest level of employee participation suggesting a strong awareness among workers about minimizing pollution and industrial emissions. Refinery management offers education courses to foster this awareness. This strategy mitigates adverse environmental effects and enhances productivity in oil refining

Annealing study of α-Fe2O3 nanoparticles steel-waste based: microstructure and magnetic behavior

The interest of this paper is to show the influence of annealing process on magnetic properties and microstructure of -Fe2O3 derived from steel waste product (mill scales). The mill scales flakes were wet ball milling for several hours to form a fine powder. The mill scales powder was purified by using magnetic separation to isolate the magnetic and non magnetic particles. The method was continue for Curie temperature separation technique. The purified powder was annealed at 400/450/500 and 550 °C at 6 oC/mins to form hematite, -Fe2O3. The annealed powders were milled for several hours by using mechanical alloying. Annealing at varied temperatures produced α-Fe2O3 nanopowders with average crystallite size 18.1 nm to 28.6 nm. Phase transformation occurred directly by annealing in air, conversion of FeO and Fe3O4 phase to form α-Fe2O3. The correlation between the magnetic properties and microstructure, of the sintered powders at 1200 oC enables to obtain microphase of α-Fe2O3 and Fe3O4 with different particle size and magnetic properties. The resultant α-Fe2O3 nanopowders are ferromagnetic with moderate coercivities

DEVELOPMENT OF HUMANITARIAN SUPPLY CHAIN PERFORMANCE CONCEPTUAL FRAMEWORK IN CREATING RESILIENT LOGISTICS NETWORK

Humanitarian logistics which is precisely known as humanitarian supply chain (HSC) plays a major role in reducing the impact of disaster on human life and livelihood by providing humanitarian aid in the forms of food, water, medicine, shelter and other supplies. Unfortunately, anecdotal evidences indicated that relief chain tends to be unstable, unpredictable and unresponsive to the needs of disaster victims. The 2004 Asian tsunami highlighted the lack of coordination between the relief chain linkages that hampered effective supply of aid. This phenomenon was further evident in our own context during the 2014 flood devastation in Peninsular Malaysia. Floodwaters and subsequent landslides blocked major roads, limiting access to evacuation centres and impeding the delivery of emergency relief supplies. Hence, an effective humanitarian supply chain management (HSCM) should be able to be deployed rapidly enabling provision of aid to beneficiaries. Notwithstanding the frequency and impact of disasters, humanitarian organizations today are under continuous pressure of improving their logistics performance. Departing from this need, this study aims to examine the criteria that influence the humanitarian aid actors in their decision making while increasing transparency and accountability of relief operations. Therefore, it is imperative for humanitarian sector to quantify the efficiency and effectiveness of a particular relief operation using set of performance metrics. A mixed methods approach comprising qualitative and quantitative survey will be used. The study intended to identify and define the metrics that would determine successful operational performance of disaster relief. This research will contribute mainly in the development of a HSCM performance model that (i) informs decision makers at the strategic, tactical and operational level in tracking progress, (ii) facilitate a more open and transparent communication and cooperation between humanitarian actors, and (iii) improve the logistics of disaster management both at the government and at non-governmental level

Students’ Inclination towards English Language as Medium of Instruction in the Teaching of Science and Mathematics

AbstractMalay language, the national language of Malaysia has been the medium of instruction for Science and Mathematics for the past four and a half decades in Malaysia. The government however changed the medium of instruction of these subjects to English in January 2003. The “Teaching and Learning of Science and Mathematics in English” (PPSMI) policy was implemented in all primary and secondary schools. It aims to improve the English language proficiency among students as well as the learning and achievement level in science and mathematics. This paper presents findings of the study on students’ inclination towards English language as medium of instruction in teaching and learning of Science and Mathematics in Higher Learning Institutions in Malaysia. The respondents were 291 undergraduate students from the Faculty of Science and Technology (FST) and Faculty of Education (FPEND) of Universiti Kebangsaan Malaysia (UKM). A questionnaire pertaining to students’ inclination was used as research instrument. Using descriptive statistics, ANOVA and t-test, the study found that undergraduate students of FST and FPEND had an inclination towards English as medium of instruction in the teaching and learning of Science and Mathematics. Using the Post-Hoc test, it is found that Indian students and students from other races than Malay and Chinese have greater inclination towards English as medium of instruction in teaching and learning of Science and Mathematics in UKM for both faculties. However, FST students who studied in Mandarin and Tamil at pre-university level (STPM) had higher inclination compared to those who used Malay language or even English

Criteria and computer-aided design of solid slab to BS 8110 - the structural use of concrete

Criteria for the limit state design of reinforced concrete slabs are discussed. A step by step longhand solution for some of rectangular slabs is given in order to explain the limit state concept of BS 8110. A general purpose computer program written in GWBASIC calculates the ultimate moments, reinforcement area, spacing, deflection, and local damage and crack widths in any specific direction