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Displaying publications 21 - 40 of 665 in total

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Optimization of Manganese Reduction in Biotreated POME onto 3A Molecular Sieve and Clinoptilolite Zeolites

Jami MS, Rosli NS, Amosa MK

Water Environ Res, 2016 Jun;88(6):566-76.
PMID: 26556067 DOI: 10.2175/106143015X14362865227157

Availability of quality-certified water is pertinent to the production of food and pharmaceutical products. Adverse effects of manganese content of water on the corrosion of vessels and reactors necessitate that process water is scrutinized for allowable concentration levels before being applied in the production processes. In this research, optimization of the adsorption process conditions germane to the removal of manganese from biotreated palm oil mill effluent (BPOME) using zeolite 3A subsequent to a comparative adsorption with clinoptilolite was studied. A face-centered central composite design (FCCCD) of the response surface methodology (RSM) was adopted for the study. Analysis of variance (ANOVA) for response surface quadratic model revealed that the model was significant with dosage and agitation speed connoting the main significant process factors for the optimization. R(2) of 0.9478 yielded by the model was in agreement with predicted R(2). Langmuir and pseudo-second-order suggest the adsorption mechanism involved monolayer adsorption and cation exchanging.

Matched MeSH terms: Analysis of Variance
Fulltext Removal of reactive red 4 dye using chitosan-epichlorohydrin/ TiO2 nanocomposite: application of response surface methodology

Ibrahim Awad Mohammed, Abdallah Reghioua, Emad Yousif, Ali H. Jawad, Nurul Najwa Abd Malek

Science Letters, 2020;14(1):96-108.
MyJurnal

Chitosan-epichlorohydrin/TiO2 composite was synthesized to be employed as an adsorbent for the
removal of reactive red 4 (RR4) dye from aqueous solution. Response surface methodology (RSM) with 3-level Box-Behnken design (BBD) was utilized for the optimization of the removal of RR4. The process key variables which include adsorbent dose (A: 0.5 – 1.5 g), pH (B: 4 – 10) and time (30 – 80 min) were selected for the optimization process. The experimental data for RR4 removal were statistically analysed using analysis of variance (ANOVA). The significant interaction between key parameters on RR4 removal efficiency was observed by interaction between AB and AC. The highest RR4 removal (95.08%) was obtained under the following conditions; adsorbent dose (1.0 g), pH 4 and time of 80 min.

Matched MeSH terms: Analysis of Variance
Low-Cost Self-Made Arthroscopic Training Camera Is Equally as Effective as Commercial Camera: A Comparison Study

Ling JL, Teo SH, Mohamed Al-Fayyadh MZ, Mohamed Ali MR, Ng WM

Arthroscopy, 2019 02;35(2):596-604.
PMID: 30611592 DOI: 10.1016/j.arthro.2018.08.038

PURPOSE: To assess the effectiveness of a low-cost self-made arthroscopic camera (LAC) in basic arthroscopic skills training compared with a commercial arthroscopic camera (CAC).
METHODS: One hundred fifty-three orthopaedic residents were recruited and randomly assigned to either the LAC or CAC. They were allocated 2 practice sessions, with 20 minutes each, to practice 4 given arthroscopic tasks: task 1, transferring objects; task 2, stacking objects; task 3, probing numbers; and task 4, stretching rubber bands. The time taken for participants to complete the given tasks was recorded in 3 separate tests; before practice, immediately after practice, and after a period of 3 months. A comparison of the time taken between both groups to complete the given tasks in each test was measured as the primary outcome.
RESULTS: Significant improvements in time completion were seen in the post-practice test for both groups in all given arthroscopic tasks, each with P < .001. However, there was no significant difference between the groups for task 1 (P = .743), task 2 (P = .940), task 3 (P = .932), task 4 (P = .929), and total (P = .944). The outcomes of the tests (before practice, after practice, and at 3 months) according to repeated measures analysis of variance did not differ significantly between the groups in task 1 (P = .475), task 2 (P = .558), task 3 (P = .850), task 4 (P = .965), and total (P = .865).
CONCLUSIONS: The LAC is equally as effective as the CAC in basic arthroscopic skills training with the advantage of being cost-effective.
CLINICAL RELEVANCE: In view of the scarcity in commercial arthroscopic devices for trainees, this low-cost device, which trainees can personally own and use, may provide a less expensive and easily available way for trainees to improve their arthroscopic skills. This might also cultivate more interest in arthroscopic surgery among junior surgeons.

Matched MeSH terms: Analysis of Variance
Evaluation of five promoters for use in transformation of oil palm (Elaeis guineensis Jacq.)

Chowdhury MKU, Parveez GKA, Saleh NM

Plant Cell Rep, 1997 Feb;16(5):277-281.
PMID: 30727662 DOI: 10.1007/BF01088280

The efficiency of GUS (β-Glucuronidase) gene expression in embryogenic callus and young leaflets of mature and seedling palm after microprojectile bombardment with five constructs (pEmuGN, pAHC25, pAct1-F4, pGH24 and pBARGUS) was evaluated to identify the most suitable promoter(s) to use in transformation attempts in oil palm. Expression of the GUS gene driven by theEmu, Ubi1, Act1 35S orAdh1 was assayed, both histochemically and fluorometrically, from a total of 200 plates of tissues in eight independent experiments two days after bombardment. A completely randomized experimental design was used for each experiment, and the data analysed by ANOVA and Duncan's Multiple Range Test. The expression level of GUS driven by theEmu orUbi1 promoters was significantly higher than that of the Act], 35S and Adhl promoters in many experiments, and that of theAdhl was significantly lower than those of the other four promoters. Both histochemical and fluorometric data indicate that in embryogenic callus, the expression of theEmu promoter was higher than that of theUbi1 whereas in young leaflets from mature palm the Ubi1 expression was stronger. The performances of the five promoters were also tested in tobacco callus using a fluorometric GUS assay. The activity of the 35S promoter was highest, and significantly different from that of all the other promoters except theEmu, and that of theAct1 promoter was lowest. These results indicate that either theUbil orEmu promoter should facilitate the expression of desired genes in oil palm and aid in development of an efficient stable transformation system.

Matched MeSH terms: Analysis of Variance
Fulltext The impact of using historical text document resources on the understanding of historical substantive concepts

M. Kaviza

Malaysian Journal of Social Sciences and Humanities, 2019;4(7):208-217.
MyJurnal

This study aims at investigating the effect of using historical text document resources on the historical substantive concepts understanding among Form Four students. A learning activities module was developed based on using historical text document resources as reference for intervention in this study. Pre-Experimental Design: One Group PreTest-PostTest was used in this study. The impact of using historical teks document resources on the historical substantive concepts understanding were measured in the pre-test, post-test and delayed post-test. A sample of respondents comprising 55 students from existing classes was recruited in this study using cluster sampling techniques. The historical substantive concept understanding test was used in this study. Data were analyzed by descriptive and inference statistics using Repeated-Measures One Way ANOVA test. The findings showed that the use of historical text document resources has an impact on the historical substantive concepts understandingand retaintion. The implication of this study is to provide the content and methods for implementation of history learning by using a set of collections of historical text document resources which relevant to a historical topic.

Matched MeSH terms: Analysis of Variance
Behavioural responses of anxiety in aversive and non-aversive conditions between young and aged Sprague-Dawley rats

Hiew LF, Khairuddin S, Aquili L, Koh J, Fung ML, Lim WL, et al.

Behav Brain Res, 2020 05 15;385:112559.
PMID: 32097707 DOI: 10.1016/j.bbr.2020.112559

Measures of anxiety in behavioural tests remain largely unclear even decades after their establishment. Differences in the severity of anxiety measured by anxiety tests is an important issue that must be addressed. To test the hypothesis that the addition of light as an aversive stimulus will elicit a difference in behaviour between aged and young animals, we compared the responses of aged and young animals in the home cage emergence test (HCET) and elevated plus maze (EPM), in high aversive bright light and low aversive dim light conditions. In the HCET, our results demonstrated that young animals escaped with shorter latency and greater frequency than aged animals in both bright and dim light conditions, indicating that young animals display greater exploratory tendencies than aged animals. In the EPM, bright light conditions induced anxiogenic effects in both age groups. Interestingly, two-way ANOVA showed a significant interaction effect of age and light on the number of entries into the open arms of the EPM as well as frequency of escape in the HCET. These results show that the addition of light as an aversive stimulus in the EPM and HCET produced different responses in aged versus young animals in each test. In conclusion, significant interactions between age and light affected aged and young animals differently in the HCET and EPM, indicating that the two tests measure different aspects of anxiety.

Matched MeSH terms: Analysis of Variance
Fulltext The angiotensin converting enzyme (ACE) I/D gene polymorphism in Malaysian well trained athletes

Hazwani Ahmad Yusof, Rabinderjeet Singh, Zainuddin Zafarina, Kieron Rooney, Ahmad Munir Che Muhamed

Jurnal Sains Sukan & Pendidikan Jasmani, 2014;3(1):20-33.
MyJurnal

The purpose of this study was to examine the effect of the ACE I/D gene polymorphism on athletic status and physical performance of well-trained Malaysian athletes. The distribution of ACE I/D gene polymorphism among 180 well trained athletes was compared with 180 sedentary controls. 20 meter Yo-Yo intermittent recovery and leg strength tests were used to measure maximal oxygen consumption (VO2max) and leg strength value of athletes with different ACE I/D genotype, respectively. Chi-Square and one way ANOVA tests were used for data analysis. The II and DD genotype were more prevalent among the endurance athletes and the strength/ power athletes compared to the other groups, respectively (p=0.00). The VO2max was not significantly associated with ACE genotype in athlete (p=0.828). However, athletes with the DD genotype had recorded a greater result for leg strength (113.8 ± 36.2) than those with the II (96.2 ± 28.0) and the ID (112.2 ± 33.5) genotype (p=0.047). This study supports the notion that ACE I/D gene polymorphism might be a genetic factor associated with athletic status and strength performance among the Malaysian population. Future studies with more representation of endurance athletes might able to detect the association between I allele and endurance performance.

Matched MeSH terms: Analysis of Variance
Fulltext Optimization studies on microwave assisted extraction of dragon fruit (Hylocereus polyrhizus) peel pectin using response surface methodology

Rahmati, S., Abdullah, A., Momeny, E., Kang, O.L.

International Food Research Journal, 2015;22(1):233-239.
MyJurnal

Optimization of microwave assisted extraction of dragon fruit peel pectin was conducted using respond surface methodology. Effect of extraction conditions, i.e. pH value (X1), extraction time (X2) and solid-liquid ratio (X3) on the extraction yield was investigated using a central composite experimental design. Optimization of microwave assisted extraction was performed and three-dimensional (3D) response surface plots were derived from the mathematical models. Analysis of variance (ANOVA) was conducted and indicated a significant interaction between extraction conditions (pH value and extraction time) and extraction yield. The optimum conditions of microwave assisted extraction were as follows: X1 = 2.07; X2 = 65 s and X3 = 66.57. The verification test on pectin extraction was performed and revealed a perfect agreement between experimental and predicted values. The maximum predicted yield of pectin extraction was 18.53%. Overall, application of microwave assisted extraction can give rise to high quality dragon fruit peel pectin.

Matched MeSH terms: Analysis of Variance
Fulltext Assessing the reliability of subjective evaluation for comfortable driving postures

Darliana Mohamad, Dian Darina Indah Daruis, Baba Md Deros, Ahmad Rasdan Ismail

Malaysian Journal of Public Health Medicine, 2016;16(20):14-19.
MyJurnal

Drivers’ posture is one of the factors that can contribute to driving discomfort. Subjective evaluation is needed in determining the driving discomfort problem. The purpose of this study is to examine the reliability of different driving postures that may lead to drivers’ discomfort. A total of thirty-four healthy Malaysian drivers were involved in this study. Respondents were required to sit on the driver’s seat with the required adjustments of three different postures and fill-in the given subjective evaluation form. The same procedure was repeated for each respondent after three days for purpose of conducting test retest evaluation. The reliability statistical analysis result shows the study was reliable and valid with a Cronbach’s alpha coefficient equal to 0.827. The comparison means that ANOVA analysis also shows significance difference between these three groups of postures for all measured parameters. In conclusion, the result from this study shows the subjective evaluation conducted is reliable and can be used for drivers’ posture discomfort study.

Matched MeSH terms: Analysis of Variance
Wavelet Analysis of Resultant Velocity Belonging to Genuine and Forged Signatures

Syed Ahmad SM, Loo LY, Wan Adnan WA, Md Anwar R

J Forensic Sci, 2017 Mar;62(2):374-381.
PMID: 28000207 DOI: 10.1111/1556-4029.13303

This study presents a wavelet analysis of resultant velocity features belonging to genuine and forged groups of signature sample. Signatures of individuals were initially classified based on visual human perceptions of their relative sizes, complexities, and legibilities of the genuine counterparts. Then, the resultant velocity was extracted and modeled through wavelet analysis from each sample. The wavelet signal was decomposed into several layers based on maximum overlap discrete wavelet transform (MODWT). Next, the zero crossing rate features were calculated from all the high wavelet sub-bands. A total of seven hypotheses were then tested using a two-way ANOVA testing methodology. Of these, four hypotheses were conducted to test for significance differences between distributions. In addition, three hypotheses were run to provide test for interaction between two factors of signature authentication versus perceived classification. The results demonstrated that both feature distributions belonging to genuine and forged groups of samples cannot be distinguished by themselves. Instead, they were significantly different under the influence of two other inherent factors, namely perceived size and legibility. Such new findings are useful information particularly in providing bases for forensic justifications in establishing the authenticity of handwritten signature specimens.

Matched MeSH terms: Analysis of Variance
Fulltext Data normatif timpanometri di kalangan kanak-kanak Melayu prasekolah

Noor Alaudin Abdul Wahab, Norashikin Chahed

Jurnal Sains Kesihatan Malaysia, 2010;8(1):13-18.
MyJurnal

Kajian ini bertujuan untuk mendapatkan data normatif timpanometri di kalangan kanak-kanak Melayu prasekolah dan membandingkannya menurut jantina. Ini kerana faktor bukan patologi seperti umur, jantina dan bangsa mempengaruhi data normatif timpanometri. Sehubungan itu, garis panduan saringan telinga tengah oleh American Speech and Hearing Association (ASHA) yang menggunakan data normatif timpanometri kanak-kanak Kaukasian mungkin tidak sesuai untuk populasi kanak-kanak Melayu. Parameter timpanometri yang diukur ialah puncak statik admitan akustik dikompensasi (puncak Ytm), isipadu salur telinga luar (Vea) dan kelebaran timpanogram (TW). Seramai 161 orang kanak-kanak Melayu (80 orang kanak-kanak lelaki dan 81 orang kanak-kanak perempuan) berumur antara 4 hingga 6 tahun terlibat di dalam kajian ini. Bagaimanapun, hanya seramai 45 orang kanak-kanak lelaki dan 46 orang kanak-kanak perempuan (163 dari keseluruhan 182 telinga) memenuhi kriteria inklusi iaitu lulus pemeriksaan otoskopi dan saringan pendengaran serta menunjukkan refleks akustik ipsilateral pada 1000 Hz. Ujian ANOVA Campuran dua-hala untuk membandingkan min parameter timpanometri kanak-kanak lelaki dan perempuan menunjukkan tiada perbezaan yang signifikan; min puncak Ytm (p > 0.05), min Vea (p > 0.05), dan min TW (p > 0.05). Oleh itu, data kedua-dua kumpulan ini digabungkan. Secara keseluruhan, nilai min puncak Ytm ialah 0.55 ± 0.28mmhos, min Vea ialah 0.90 ± 0.39 cm3, dan min TW ialah 104.68 ± 32.08 daPa. Julat normal persentil ke-90 bagi puncak Ytm ialah antara 0.27 hingga 1.18 mmhos, Vea antara 0.45 hingga 1.65 cm3 dan TW antara 59.60 hingga 149.80 daPa. Hasil kajian mencadangkan data normatif timpanometri ini sesuai digunakan ke atas kanak-kanak Melayu prasekolah namun ianya tidak perlu dibezakan mengikut jantina. Sekiranya setiap satu nilai TW > 200 daPa dan Vea > 1.0 cm3 oleh ASHA diaplikasi ke atas kanak-kanak Melayu prasekolah, maka masing-masing akan menyebabkan kadar rujukan yang rendah dan kadar rujukan yang berlebihan.

Matched MeSH terms: Analysis of Variance
Individual factors and perceptions of organization safety level: evidence from a manufacturing organization in Malaysia

Shah Rollah Abdul Wahab, Durrishah Idrus, Christopher J. Rees, Ishak Mad Shah

Journal of Occupational Safety and Health, 2011;8(1):33-48.
MyJurnal

Individual factors have been considered to be a key issue to organizations’ performance and survival. Specifically, previous studies provide evidence that individual factors are closely associated with accidents in the workplace. Therefore, this study seeks to investigate the relationship between individual factors and workplace safety. 50 respondents have been randomly chosen from a manufacturing company in Johor Bahru, Malaysia. Data are collected using a survey and are analyzed using SPSS version 16.0. A descriptive statistic, cross tabulation, independent sample t-test and one-way between groups ANOVA are employed to interpret findings of the study. Findings show that employees’ perception on safety performance is at high level (Mean= 115, Standard Deviation= 17.73). Furthermore, the results of cross tabulation demonstrate that individual factors play a key role to determine the organization safety performance level. Another significant finding reveals that there is a significant difference of safety performance mean to two of individual factors namely gender and tenure of service. Individual factors namely gender, age, tenure of service and academic qualification give a significant impact to employees’ perception on safety performance.

Matched MeSH terms: Analysis of Variance
Fulltext Modelling of motion resistance ratios of pneumatic and rigid bicycle wheels

Ahmad, D., Jamarei, O., Sulaiman, S., Fashina, A.B., Akande, F.B.

Pertanika Journal of Science & Technology, 2013;21(1):59-74.
MyJurnal

The motion resistances of 660 mm pneumatic and rigid bicycle wheels of the same rim diameter were measured experimentally using the developed tractor-towed single non-lug narrow wheel motion resistance test rig for traction studies. The motion resistances measured were taken to be the towing forces determined in real time using Mecmesin Basic Force Gauge (BFG 2500). The test variables included two test surfaces [tilled and wet (mud) surfaces], the dynamic load and the towing velocity. The tyre inflation pressure of 414 kPa was chosen to make the surface synonymous with that of the rigid wheel. Motion resistance ratios of the two wheels were determined empirically and through semi-empirical approach. The motion resistances of the rigid wheel were found to be greater than those of the pneumatic wheel for both surfaces. Consequently, the motion resistance ratios of the rigid wheel were greater than those obtained
from the pneumatic wheel. Analysis of variance showed that there were significant differences between the means of the motion resistance measured on the test surfaces, as well as between the two wheels and their interactions with the test surfaces. The motion resistance ratio exhibited a linear relationship with the towing velocity, while the relationship with the dynamic load was quadratic. However, such a relationship is either direct or inverse with the respective variables. The motion resistance ratio models for the pneumatic and rigid wheels showed that on different test conditions of the dynamic loads and the towing velocities, the relationships between the motion resistance ratio and the dynamic load, and motion resistance with dynamic load were also different.

Matched MeSH terms: Analysis of Variance
Fulltext Decision making and performance of Malaysian rugby sevens referees

Mohamad Nizam Nazarudin, Suppiah, Pathmanathan K., Mohamad Razali Abdullah, Mohd Sofian Omar Fauzee, Parnabas, Vincent, Nagoor Meera Abdullah

Movement Health & Exercise, 2015;4(1):61-75.
MyJurnal

This study aims to examine the decision making by rugby sevens referees, and its relationship with the referees' performance. The instruments used in this study are the Rugby Referee Decision Making Test (α=.74) and the Referee Sevens Field Performance Evaluation (α=.94). It was administered to 132 rugby sevens referees (mean age 33.4 + 1.5 years; 132 males) from the Malaysian Rugby Union (MRU), which have been refereeing in 10 rugby sevens tournaments in Malaysia. Descriptive and Inferential statistics (one way ANOVA and Pearson's Correlation) were employed to analyse the data. Decision Making ( ̅= 24.13, SD=5.24) and performance ( ̅= 136.45, SD = 4.47) were identified at a moderate level. The findings indicated no significant differences [F= (3, 128) =.246, p>0.05] in the decision making across age level, but there were significant differences [F= (3, 128) =63.159, p

Matched MeSH terms: Analysis of Variance
Fulltext Design and development of a sweet potato digging device

Md. Akhir, H., Ahmad, D., Rukunudin, I. H., Shamsuddin, S., A. Yahya

Pertanika Journal of Science & Technology, 2014;22(1):43-53.
MyJurnal

This paper describes a study on the design, fabrication and testing of a prototype digging device for sweet potato tubers in bris soil. The soil texture was sandy soil (fine sand 94.53%), with mean moisture content of 9.16% and mean bulk density of 1.44 g-cm-3. The soil was prepared in a soil bin. Three types of soil digging tools were designed and fabricated to determine the optimum draft force. These were Flat or plane, V-shaped and Hoe type blades. Plane and V-shaped blades were 30 cm long, and 13 cm wide, while the Hoe type had three rods, 25 mm in diameter, 30 cm long and 6.5 cm wide with sharp cutting edge. The digging tools were tested in a soil bin filled with bris soil to determine the optimum draft force and area of soil disturbance. The results were analysed using statistical analysis of variance (ANOVA). Comparison between all blade types and blade depths to measured draft force and the area of soil disturbed showed that the highest draft of 0.54 kN-m-2 was caused by a flat or plane blade at the optimum depth of 20 cm when the area of soil disturbed was 0.180 m2 . The V-shaped blade had the mean draft of 0.51 kN-m-2, with area of soil disturbance of 0.185 m2 . Thebest choice was V-shaped blade with a rake angle of 30o at 20 cm. depth. The selected blade was fixed onto the sweet potato harvester and tested on bris soil planted with sweet potato of Telong and VitAto varieties. The harvesting efficiency of the machine in bris soil was 93.64% and 90.49% for Telong (Plot A) and VitAto (Plot B) varieties, respectively. The average ground speed and turning time during operation for plots A and B was 0.56 km-hr-1 and 102.7 s and 0.99 km-hr-1 and 81.22 s, respectively. The harvesting efficiencies for both plots showed no significant difference. The total productive time (harvesting time) and unproductive time (turning time) in plot A, at a tractor speed of 0.56 km.hr-1, was 14.8 hours for harvesting a hectare of sweet potato ( 0.068 ha.hr-1). In plot B, the total time for harvesting a hectare of sweet potato was 8.35 hours (0.12 ha.hr-1) at a tractor speed of 0.99 km.hr-1. The average harvesting time for both plots was 11.47 hr.ha-1. The average field work rate was 0.087 ha.hr-1 or 34 man-hr.ha-1 compared to manual harvesting of 150 man-hrs.ha-1.

Matched MeSH terms: Analysis of Variance
Fulltext A comparative study on the inter-session and interexaminer reliability of corneal power measurement using various keratometry instruments

Md. Muziman Syah, M. M., Mutalib, H. A., Sharanjeet Kaur, M. S., Khairidzan Khairidzan, M. K.

International Medical Journal Malaysia, 2016;15(1):69-74.
MyJurnal

Introduction: The purpose of this study was to evaluate inter-session repeatability, inter-examiner
reproducibility and inter-device agreement of corneal power measurements from manual keratometer,
autokeratometer, topographer, Pentacam high resolution and IOLMaster. Methods: Two sets of mean
corneal power measurements (n=40) were compared for inter-session repeatability and inter-examiner
reproducibility in each instrument. Repeatability and reproducibility were evaluated by within-subject
standard deviation (Sw), coefficient of variation (COV) and intraclass correlation coefficient (ICC). A oneway
repeated measures analysis of variance was conducted to compare differences in the corneal power
between each instrument pair. The Bland and Altman analysis and Pearson’s correlation were employed to
assess agreement and determine strength of relationship between measurements. Results: There were no
significant differences in mean corneal power measurements between 2 different visits (p > 0.05). The Sw
and COV values between 2 visits were lower than 0.09 D and 0.20 % respectively. The ICCs were stronger
than 0.99 in all instruments. For reproducibility of each instrument, differences of the measurements
between 2 different examiners were also insignificant (p > 0.05). The Sw and COV values between 2
examiners were lower than 0.11 D and 0.23 % respectively. The ICCs were 0.99 and above in all instruments.
The 95% limit of agreement between instruments ranged from -0.29 to 1.13 D and the r-values were stronger
than 0.84. Conclusion: The corneal power measurements using these 5 instruments were repeatable and
reproducible. These instruments can also be used interchangeably, however the topographer should be used
with caution.

Matched MeSH terms: Analysis of Variance
Evaluation of Microleakage Between Different Post and Core Systems Under Gradual Loading: an In-Vitro Study

Salim NA, Muttlib NAA, Alawi R, Rahman NA, Ariffin Z

Acta Stomatol Croat, 2018 Sep;52(3):218-226.
PMID: 30510297 DOI: 10.15644/asc52/3/5

Objective: This study aimed to compare the difference in marginal dye penetration between everStick, Parapost XP, Parapost fiber white and control groups under gradual loading.
Materials and Methods: Sixty-eight human maxillary permanent incisors were divided into four groups. Each specimen was endodontically treated with step-back technique and prepared for each post system according to experimental groups, subsequently cemented in the canal. Composite resin cores were built and laboratory fabricated metal crowns were cemented. All specimens except those in the control group were subjected to thermal cycling. All groups were subjected to gradual loading from 0N-50N for 100 cycles. Specimens were sectioned transversely and the depths of dye penetration along the post were measured. Data were entered in SPSS ver. 22 and analyzed using two-way ANOVA test.
Results: There was no significant difference in marginal dye penetration between each group (p-value>0.05). However, there was a significant difference in percentage of marginal dye penetration between all groups (p-value<0.05); post-hoc comparison showed significant difference between Fiber White and Control groups (p-value=0.009).
Conclusion: All the groups showed dye penetration but the percentage was significant only between Parapost Fiber White and the control groups.

Matched MeSH terms: Analysis of Variance
Variasi profil 210Po dan 210Pb dalam teras sedimen di pesisir pantai perairan Sarawak

Zal Uâ€™yun Wan Mahmood, Che Abd Rahim Mohamed, Zaharudin Ahmad, Abdul Kadir Ishak

Sains Malaysiana, 2008;37.

Kajian ini dijalankan untuk melihat variasi taburan 210Po dan 210Pb melalui profil menegak aktivitinya, serta nisbah aktiviti 210Po/210Pb di dalam teras sedimen yang diambil di beberapa stesen persampelan pesisir pantai perairan Sarawak. Didapati profil taburan radionuklid tersebut dalam teras sedimen adalah berubah-ubah mengikut lokasi persampelan dan telah dibuktikan melalui analisis ANOVA yang menunjukkan bahawa terdapat perbezaan bererti pada 95% aras keyakinan bagi aktiviti 210Po (p = 0.000), 210Pb (p = 0.035) dan 210Po/210Pb (p = 0.000) di semua lokasi kajian. Secara umumnya, aktiviti 210Po dan 210Pb yang diukur masing-masing dalam julat 337 ke 2460 Bq/kg, 11 ke 84 Bq/kg di SR 01; 224 ke 2008 Bq/kg, 6 ke 80 Bq/kg di SR 02; 119 ke 1595 Bq/kg, 6 ke 84 Bq/kg di SR 03; 241 ke 2294 Bq/kg, 5 ke 82 Bq/kg di SR 04 dan 175 ke 1340 Bq/kg, 4 ke 44 Bq/kg di SR 05. Merujuk kepada julat tersebut, didapati aktiviti 210Po adalah lebih tinggi daripada aktiviti 210Pb dengan purata nisbah 210Po/210Pb di semua stesen adalah melebihi satu, iaitu dalam julat 20 ke 35. Variasi profil taburan radionuklid tersebut dipercayai dipengaruhi oleh beberapa faktor sekitaran dan telah dibuktikan terdapat korelasi yang kuat di antara taburan radionuklid dengan komposisi sedimen jenis kelodak (210Po:r = 0.701 dan 210Pb: r = 0.648), kedalaman air (210Po: r = -0.647) dan jarak stesen dari daratan (210Po: r = 0.746 dan 210Pb: r = 0.975). Oleh itu, dapat disimpulkan bahawa faktor-faktor tersebut merupakan penyumbang utama ke atas perubahan yang berlaku kepada taburan 210Po dan 210Pb.

Matched MeSH terms: Analysis of Variance
Simulation and statistical approaches on electrical steel's magnetic behaviour under unidirectional single sheet tester

Noor Ashikin Mohd Rashid, Wan Nor Liza Wan Mahadi

Sains Malaysiana, 2014;43:909-914.

Evaluation of magnetic properties of electrical steel is vital in improving the quality of electrical machinery since it is used as magnetic cores for transformers, motors and generators. A double yoke single sheet tester (ssT) was modeled using two identical C-cores wound with copper wires at limb side in horizontal arrangement. The magnetic properties for electrical steels, grade M4 and M19 were tested under a frequency of 50 Hz with the current ranging from 02 to 2.4A. The effects of the sample dimension and anisotropy on magnetic measurements were investigated. Evaluation on specimen dimensions indicate that the non-uniformity of sample magnetization in overhang sample can attribute to the flux leakage between the yoke legs. The stray flux is also increased with the overhang sample. However, the so-called fit-in sample which is fitted nicely between the yoke end poles can minimize the effect of stray flux. One way ANOVA and T-test were used as statistical methods and executed at the 5% significance level. It is statistically proven that the magnetic properties of both magnetic materials are influenced by their anisotropy.

Matched MeSH terms: Analysis of Variance
Skor pengukuran kebergunaan perisian kursus matematik berdasarkan faktor penilai

Noraidah Sahari @ Ashaari, Hairulliza Mohd Judi, Abdul Azim Abdul Ghani, Mohd Hasan Selamat, Aida Suraya Md Yunus

Sains Malaysiana, 2010;39.

Tujuan utama kajian ini adalah untuk menghasilkan bukti kesahan dan kebolehpercayaan metrik pengukuran kebergunaan perisian kursus matematik secara psikometrik dan seterusnya membentuk rumus skor kebergunaan. Kertas ini membincangkan pembentukan rumus kebergunaan. Berdasarkan pandangan secara teori, satu model hipotesis kebergunaan dengan tiga faktor iaitu kebolehgunaan, kefungsian dan kecekapan dan 85 metrik dicadangkan. Melalui pengesahan pakar dan ujian kebolehpercayaan metrik kebergunaan dikurangkan kepada 64. Instrumen dengan 64 metrik ditadbir ke atas 620 guru matematik di lima zon di Malaysia. Mereka diminta melayari perisian kursus matematik (PKM) sambil melengkapkan instrumen. Analisis faktor penjelajahan dilakukan untuk mengesahkan konstruk kebergunaan manakala analisis faktor pengesahan dijalankan untuk membentuk model berstruktur dengan memadankan 34 metrik dengan model hipotesis. Ujian-t dan ujian ANOVA mendapati tiga pembolehubah iaitu, bidang pengkhususan guru, pengalaman menggunakan komputer dan ralat penilaian menyumbang kepada skor kebergunaan. Dapatan ini digunakan untuk membentuk rumus kebergunaan PKM.

Matched MeSH terms: Analysis of Variance

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