Graphene MEMS capacitive microphone: highlight and future perspective

MEMS microphone is widely used in the electronic product nowadays because of its tiny size body, low power consumption and performance consistency over time and temperature. This paper highlights on the MEMS capacitive microphone and future perspective. This paper discusses the working principle of capacitive-based MEMS microphone and some of the important performance parameter that must be considered for the MEMS microphone. Recent MEMS microphone technology incorporates graphene as the microphone membrane. Finally, we discuss the future prospect and the possibility for graphene usage as the membrane for MEMS microphone

Biological Particle Control and Separation using Active Forces in Microfluidic Environments

Exploration of active manipulation of bioparticles has been impacted by the development of micro-/nanofluidic technologies, enabling evident observation of particle responses by means of applied tunable external force field, namely, dielectrophoresis (DEP), magnetophoresis (MAG), acoustophoresis (ACT), thermophoresis (THM), and optical tweezing or trapping (OPT). In this chapter, each mechanism is presented in brief yet concise, for broad range of readers, as strong foundation for amateur as well as brainstorming source for experts. The discussion covers the fundamental mechanism that underlying the phenomenon, presenting the theoretical and schematic description; how the response being tuned; and utmost practical, the understanding by specific implementation into bioparticles manipulation engaging from micron-sized material down to molecular level particles

Moral penapisan kendiri filem dokumentari sejarah

Khalayak secara keseluruhannya mempunyai kemampuan yang berbeza dalam memberi interpretasi ke atas teks media. Oleh itu, setiap penerbitan teks media perlu memenuhi etika penyampaian yang sebenar supaya tidak menimbulkan kekeliruan dalam interpretasi mesej. Penulisan ini bertujuan mengenal pasti penapisan kendiri dalam teknik penyampaian mesej melalui enam sekuen sebuah filem dokumentari sejarah The Kinta Story (1949) terbitan Filem Negara Malaysia. Persembahan naratif filem dokumentari sejarah ini mendokong etika sebuah penyampaian makna perlambangan kepada perjuangan menentang pengganas komunis. Persoalannya, adakah etika penyampaian mesej filem dokumentari ini mengikut prinsip sebenar sebuah penyampaian filem dokumentari sejarah? Pendekatan ‘Aristotle’s Golden Mean’ berdasarkan Conrad C. Fink dan analisis teknik naratif berdasarkan pendekatan oleh Richard M. Blumenberg, David Bordwell & Kristin Thompson dan Herbert Zettl digunakan dalam menilai interpretasi mesej berdasarkan pandangan informan dalam perbincangan kumpulan fokus. Rentetan daripada faktor sosial, kekangan teknologi dan pengaruh budaya luar yang mempengaruhi penapisan kendiri, maka filem dokumentari sejarah The Kinta Story (1949) telah berjaya menimbulkan interpretasi yang sama daripada masyarakat pada ketika itu tentang kehebatan pihak British dan kekejaman komunis. Hasilnya teknik naratif dan etika penyampaian yang digunakan dalam filem dokumentari ini telah berjaya membawa mesej serta mencapai sasaran sebagai sebuah filem dokumentari propaganda untuk mendapat sokongan masyarakat pada ketika itu dalam menghapuskan ancaman komunis

Developing of emergency evacuation kit in response of Malaysia East Coast flood disaster

The flood struck East Coast of Peninsular Malaysia in December 2014 has resulted in huge natural disaster. More than 4.82 million people across four states especially Kelantan were sink flooded, resulted shut down of the area from outside traffic and delaying the rescue forces. Emergency aid has difficulties to reach the evacuation centres and victims were scattered trapped with low life support on water, food, energy and healthcare supply. Therefore, an integrated assessment of flood in the basin is important to seek for effective responses. In response to disaster vulnerability for risk reduction among society who living in flood prone, community contribution is needed in preparation of emergency evacuation kit as a part of preparedness. The survey will be conduct by distribution of questionnaire to the flood disaster victims in order to discover the most important necessities during flood situation. The results of this survey may lead to the preparation of emergency evacuation kit for use in future

Mechanical behaviour and morphology of thixoformed aluminium alloy reinforced by graphene

Thixoforming is a promising method that offers several advantages over both liquid and solid processing. This process utilizes semi-solid behaviour and reduces macrosegregation, porosity and forming forces during the shaping process. Microstructural and mechanical characterization of 0.3, 0.5 and 1.0 wt% graphene nanoplatelet (GNP) reinforced A356 aluminium alloy composite fabricated by thixoforming was investigated. Stir casting was employed to fabricate feedstocks before they were thixoformed at 50% liquid. The microstructure was characterized and evaluated by field emission scanning electron microscopy with an energy dispersive X-ray detector and X-ray diffraction. Mechanical testing, such as microhardness and tensile testing, was also performed to estimate the mechanical properties of the composites. The incorporation of 0.3 wt.% GNPs in Al alloy increased by about 27% in ultimate tensile strength and 29% in hardness. The enhancement in tensile strength is primarily attributed to load transfer strengthening due to the uniform dispersion of these GNPs within the Al matrix, which promotes effective load transfer during tensile deformation, and GNPs’ wrinkled surface structure. Simultaneously, the addition of GNPs enhances the grain refinement effect of the Al alloy matrix, resulting in a grain size strengthening mechanism of the GNPs/Al composites. The results reveal that thixoformed composite microstructure consists of uniformly distributed GNPs, α-Al globules and fine fibrous Si particles. The composites’ grains were refined and equiaxed, and the mechanical properties were improved significantly. This study creates a new method for incorporating GNPs into Al alloy for high-performance composites

Superheated steam pretreatment of cellulose affects its electrospinnability for microfibrillated cellulose production

In this study, oil palm mesocarp fiber (OPMF) was pretreated with (1) superheated steam (SHS) and (2) potassium hydroxide (KOH) to remove hemicellulose. Both SHS–OPMF and KOH–OPMF underwent delignification step to isolate the cellulose and dissolved in selected ionic liquid and its co-solvent before being electrospun to obtain microfibrillated cellulose (MFC). FE-SEM images showed that SHS–OPMF cellulose produced discontinuous MFC fiber with diameter ranging from 100 to 500 nm, of which 15.5% were in the range of 100–200 nm; while KOH–OPMF cellulose produced continuous MFC with sizes larger than 200 nm. The differences in fiber size and continuity of fiber produced were due to incomplete removal of hemicellulose from SHS–OPMF sample that inhibited fiber re-coalescence and resulted in interruption in fiber formation

Fill Time Optimization Analysis In Flow Simulation Of Injection Molding Using Response Surface Method

This study focuses on the analysis of fill time by optimizing the injection molding parameters to reduce the defects that are always found on the plastics part such as poor weld line and part not completely filling which can contribute to mechanical properties of the plastic part. The parameters selected for this study are melting temperature, mold temperature, injection time,and the number of gate positions. Response Surface Method (RSM) was used to determine the most significant and optimum parameters on the fill time. From the result analysis, it is found that the injection time is the most significant parameter that affected the fill time with a 99% contribution. The result shows that there is no interaction between process parameters toward fill time which the injection time is the only major factor that affects the fill time. The improvement increases by 0.07% after the optimization process from 4.278s to 4.281s. The most optimum parameters to longer the injection time are mold temperature at 60°C, injection time at 4s, and the number of the gate with two gates position. Thus, the longer the injection time, it can reduce the defect of molded part in the injection molding process

Intelligent vision-based navigation system for mobile robot: A technological review

Vision system is gradually becoming more important. As computing technology advances, it has been widely utilized in many industrial and service sectors. One of the critical applications for vision system is to navigate mobile robot safely. In order to do so, several technological elements are required. This article focuses on reviewing recent researches conducted on the intelligent vision-based navigation system for the mobile robot. These include the utilization of mobile robot in various sectors such as manufacturing, warehouse, agriculture, outdoor navigation and other service sectors. Multiple intelligent algorithms used in developing robot vision system were also reviewed

Приклади завдань для позакласної роботи з інформатики у початковій школі

У статті коротко описана методика проведення позакласної роботи з інформатики у початковій школі