21,068 research outputs found
Penilaian kualiti persekitaran dalaman (IEQ) bangunan Akademik Institusi Pengajian Tinggi Awam (IPTA) Malaysia dalam konteks pengurusan fasiliti
Kualiti Persekitaran Dalaman atau Indoor Environmental Quality (IEQ) merupakan
komponen penting dalam konteks bangunan mesra alam yang akan menentukan tahap
kualiti penghuni di dalam sesebuah bangunan. Secara purata dianggarkan 80%
kehidupan seharian manusia adalah berada di dalam bangunan. Ketidakseimbangan IEQ
menyumbang kepada Sindrom Bangunan Sakit (Sick Building Syndrome) sekali gus
memberi kesan kepada produktiviti para penghuni juga kepada struktur bangunan.
Sehubungan itu, kajian ini dilaksanakan untuk mengenal pasti tahap kesedaran pihak
pengurusan harta dan fasiliti di Institusi Pengajian Tinggi Awam (IPTA) terhadap IEQ
dalam konteks bangunan akademik. Kajian ini juga bertujuan untuk mengukur tahap
IEQ dan tahap kepuasan pengguna dalam bangunan akademik di IPTA. Kajian ini
melibatkan bangunan akademik di 20 IPTA di Malaysia. Metodologi kajian ini
menggunakan pendekatan kualitatif, kajian saintifik dan juga pendekatan secara
kuantitatif. Pendekatan Kualitatif digunakan bagi menilai tahap kesedaran pihak
pengurusan harta dan fasiliti IPTA melalui proses temubual yang melibatkan 20 orang
responden. Manakala pendekatan kedua adalah melalui kajian saintifik ke atas bangunan
akademik yang memfokuskan kepada pengukuran elemen keselesaan terma, keselesaan
bunyi, kualiti udara dalaman dan pencahayaan. Hasil pengukuran elemen tersebut
dibandingkan dengan piawaian dari Malaysia Standard (MS 1525;2007) dan UNESCO.
Bagi setiap IPTA, lima buah bilik kuliah dijadikan sampel dengan tiga kali bacaan setiap
hari selama dua hari diperolehi bagi mendapatkan bacaan purata. Seterusnya, melalui
pendekatan kuantitatif, data yang diperolehi melalui kaji selidik melibatkan 500
responden dan dianalisis menggunakan perisian Statistical Package for Social Science
(SPSS). Hasil kajian menunjukkan kesedaran para pengurus harta dan fasililti di IPTA
terhadap IEQ adalah baik tetapi masih ada beberapa kelemahan yang perlu
ditambahbaik. Hasil ujian saintifik yang diperolehi menunjukkan bacaan bagi suhu
dalaman, hanya UniSZA, UTHM dan UniMAS yang menepati piawaian, manakala bagi
pencahayaan, UM, UIAM, UPSI, USM, UniSZA, UTM, UTHM, UTeM, UMS dan
UniMAS berada di bawah tahap piawaian ditetapkan. Bagi keamatan bunyi, hanya UM,
UPM, UPSI, USM dan UniMAP yang menunjukkan bacaan pada piawaian ditetapkan.
Keseluruhannya menunjukkan bacaan berada pada tahap yang sederhana dan masih lagi
memerlukan pernambahbaikan. Kajian ini turut mempamerkan bacaan purata bagi setiap
elemen IEQ bagi bangunan akademik seluruh IPTA. Penemuan hasil kajian ini dijangka
dapat membantu pihak pengurusan harta dan fasiliti IPTA dalam usaha menambahbaik
tahap IEQ dalam bangunan akademik di kampus universiti sekaligus dapat
meningkatkan tahap pengurusan fasiliti dalam mencapai tahap kelestarian kampus IPTA
di Malaysia
Investigation on different composition of powder metallurgy electrode (Cu-W) in high performance edm (HPEDM) on AISI D2 hardened steel
The ideal selection of manufacturing conditions is one of the most important
aspects to take into consideration in the majority of manufacturing processes and
particularly in processes related to Electrical Discharge Machining (EDM). EDM die
sinking machines are used to machine conductive metals of any hardness or difficult
to machine with traditional methods. The problem in the capabilities of tool
electrodes which are not utilized at the optimum levels of the operating parameters
has attracted the attention of researchers and practicing engineers to manufacture tool
electrodes with highly great performance. In this work, an experimental design was
conducted to characterize the machining performances and surface integrity of three
different composition of copper tungsten (CuW) tool electrode in EDM of D2
hardened steel (58-62 HRC). Machining performances i.e. material removal rate
(MRR), tool wear rate (TWR), workpiece surface roughness (Ra) and micro-hardness
(MH) were studied for the three different composition of CuW tool electrode made
through powder metallurgy (PM) method. Machining variables were peak current
and pulse duration, meanwhile machining voltage, depth of cut and duty factor were
kept constant. The 65%W electrode is the best choice of CuW electrode on machining
D2 hardened steel due to the highest machining rate, reasonable tool wear rate and
acceptable surface characteristics. The improvement of MRR is obviously affected
by the increment of current intensity. MRR increased as the value of peak current
increased. The increment of pulse duration is not essentially improving MRR. There
is no clear relation between the alteration of pulse duration and MRR. However, the
MRR becomes the optimum at an optimal set of variables which is set at 40A and
400”s. The results of the machining performance can extent the availability of
database on EDM machinability and surface characteristics of D2 hardened steel for
machinist practices in industrial application of roughing operation
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A fabrication history based strain-fatigue model for prediction of crack initiation in a radial loading wheel
A strain-based fatigue model concerning fabrication history is applied to predict the fatigue life of a commercial car wheel under radial loads. As the prior conditions, the strain fatigue testing is performed on standard specimen of DP590 and FB540 steels at various fabrication states, including raw materials, pre-strain and pre-strain + bake. Furthermore, the strain distribution of car wheel during its rotation under radial loads is simulated via ANSYS. The fatigue properties mainly determined by crack initiation of car wheels at various fabrication states are predicted via local stressâstrain method, in which the scale and surface factors are also taken into account. The radial fatigue testing is carried out, and the results are used to validate the present model. The fracture mechanism is analysed using FEI Nova 400 field emission gun scanning electron microscope
Mechanical properties of three-phase polyamide 6 nanocomposites
This work focus on the mechanical properties of three-phase nanocomposites using multiscale reinforcements. The influence of the nano-fillers content, as well as the temperature were studied. Polyamide-6 reinforced with short glass fibre 30 wt.% and with an addition of nanoclay (montmorillonite) and/or nanosilica (SiO2) were tested in order to characterise their tensile properties at room temperature and at 65oC just above the polyamide 6 glass transition temperature. SEM analysis were conducted on the fracture surface of the tensile bars. SEM investigations showed the importance of the interaction matrix/filler for the material behaviour. Our study also shows that the increase of OMMT percentage in polyamide-6/glass fibre composite made the material more brittle and had a negative effect on the tensile properties. Further, for the silica-based nanocomposites, an optimum was found for a nanofillers content of 1wt.%
Analysis of vibration and acoustic signals for noncontact measurement of engine rotation speed
The non-contact measurement of engine speed can be realized by analyzing engine vibration frequency. However, the vibration signal is distorted by harmonics and noise in the measurement. This paper presents a novel method for the measurement of engine rotation speed by using the cross-correlation of vibration and acoustic signals. This method can enhance the same frequency components in engine vibration and acoustic signal. After cross-correlation processing, the energy centrobaric correction method is applied to estimate the accurate frequency of the engine's vibration. This method can be implemented with a low-cost embedded system estimating the cross-correlation. Test results showed that this method outperformed the traditional vibration-based measurement method.Web of Science203art. no. 68
Investigations on the Material Efficacy of Failed Helical Gears in a Gear Train
An investigation on the material efficacy of failed helical gears in the gearbox of an automobile has been carried
out. Two helical gear samples taken as representatives of the whole of six in the gearbox were denoted as
samples A and B. Methods employed in the failure investigation include visual examination with the unaided eye
and fractography; compositional analysis; hardness measurements and microstructural analysis. The results
obtained showed that Gear sample A failed by oxidative wear essentially caused by insufficient lubrication. On
the other hand, Sample B exhibited no outward sign of failure. Processes culminating in the formation of a wear
particle were however noticed few micrometers below the surface of Gear Sample B. Furthermore, in the
absence of sufficient lubrication, numerous carbide precipitates formed in both samples contributed to wear of
the gear material. It was concluded that the premature service failures of the gears was caused by inadequate
lubrication and not inadequate material selection
Applications of aerospace technology in the public sector
Current activities of the program to accelerate specific applications of space related technology in major public sector problem areas are summarized for the period 1 June 1971 through 30 November 1971. An overview of NASA technology, technology applications, and supporting activities are presented. Specific technology applications in biomedicine are reported including cancer detection, treatment and research; cardiovascular diseases, diagnosis, and treatment; medical instrumentation; kidney function disorders, treatment, and research; and rehabilitation medicine
High definition systems in Japan
The successful implementation of a strategy to produce high-definition systems within the Japanese economy will favorably affect the fundamental competitiveness of Japan relative to the rest of the world. The development of an infrastructure necessary to support high-definition products and systems in that country involves major commitments of engineering resources, plants and equipment, educational programs and funding. The results of these efforts appear to affect virtually every aspect of the Japanese industrial complex. The results of assessments of the current progress of Japan toward the development of high-definition products and systems are presented. The assessments are based on the findings of a panel of U.S. experts made up of individuals from U.S. academia and industry, and derived from a study of the Japanese literature combined with visits to the primary relevant industrial laboratories and development agencies in Japan. Specific coverage includes an evaluation of progress in R&D for high-definition television (HDTV) displays that are evolving in Japan; high-definition standards and equipment development; Japanese intentions for the use of HDTV; economic evaluation of Japan's public policy initiatives in support of high-definition systems; management analysis of Japan's strategy of leverage with respect to high-definition products and systems
Time Enough - Consequences of Human Microchip Implantation
Dr. Ramesh argues that microchip implantation is both possible and, for some purposes, desirable and suggests that now is the time to consider strategies for preventing potentially grievous intrusion into personal privacy
Technological potential of logistics service providers and the relationship dynamics.
Notre papier porte sur plusieurs rĂ©sultats d'une enquĂȘte effectuĂ©e auprĂšs des prestataires logistiques français. L'idĂ©e dĂ©fendue est que l'effort technologique des prestataires de services logistiques contribue Ă la performance de la relation et plus gĂ©nĂ©ralement de la chaĂźne logistique dans sa globalitĂ©. Etre innovant semble constituer un indicateur d'autonomie et de capacitĂ© Ă copiloter les flux. L'effort technologique apparaĂźt ainsi comme une trajectoire stratĂ©gique de diffĂ©renciation pertinente pour les prestataires logistiques.logistic, service providers
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