Distribution of the values of the derivative of the Dirichlet L-functions at its a-points

Mohamed Taib Jakhlouti,Kamel Mazhouda 대한수학회 2017 대한수학회보 Vol.54 No.4

In this paper, we study the value distribution of the derivative of a Dirichlet $L$-function $L'(s,\chi)$ at the $a$-points $\rho_{a,\chi}=\beta_{a,\chi}+i\gamma_{a,\chi}$ of $L(s,\chi).$ We give an asymptotic formula for the sum $$\sum_{\rho_{a,\chi};\ 0<\gamma_{a,\chi}\leq T}L'\left(\rho_{a,\chi},\chi\right) X^{\rho_{a,\chi}}\ \ \hbox{as}\ \ T\rightarrow \infty,$$ where $X$ is a fixed positive number and $\chi$ is a primitive character $\!\!\mod q$. This work continues the investigations of Fujii \cite{2,3,4}, Garunk$\rm\check{s}$tis \& Steuding \cite{7} and the authors \cite{12}.

DISTRIBUTION OF THE VALUES OF THE DERIVATIVE OF THE DIRICHLET L-FUNCTIONS AT ITS a-POINTS

Jakhlouti, Mohamed Taib,Mazhouda, Kamel Korean Mathematical Society 2017 대한수학회보 Vol.54 No.4

In this paper, we study the value distribution of the derivative of a Dirichlet L-function $L^{\prime}(s,{\chi})$ at the a-points ${\rho}_{a,{\chi}}={\beta}_{a,{\chi}}+i{\gamma}_{a,{\chi}}$ of $L^{\prime}(s,{\chi})$. We give an asymptotic formula for the sum $${\sum_{{\rho}_{a,{\chi}};0<{\gamma}_{a,{\chi}}{\leq}T}\;L^{\prime}({\rho}_{a,{\chi}},{\chi})X^{{\rho}_{a,{\chi}}}\;as\;T{\rightarrow}{\infty}$$, where X is a fixed positive number and ${\chi}$ is a primitive character mod q. This work continues the investigations of Fujii [4-6], $Garunk{\check{s}}tis$ & Steuding [8] and the authors [12].

In-Service Training For Technical Teachers In Academic High Schools Of Malaysia : An Evaluative Study

Mohd Tafizam MOHD TAIB,Ramlee MUSTAPHA 한국직업자격학회 2017 한국직업자격학회 학술대회 Vol.2017 No.10

Since 1996, the technical subjects of Engineering Technology (TK), Engineering Drawing (LK) and Inventions (RC) have been introduced as elective subjects for Form 4 and Form 5 students. Examination results for TK, LK and RC from 2006 to 2010 in the Sijil Pelajaran Malaysia (SPM) [Secondary School Examination] were less encouraging. Data from the Ministry of Education also show a decline in students’ enrolment in TK, LK and RC between 10 to 17 percent from 2009 to 2011. Therefore, it is critical that this research was conducted to assess the planning and implementation of these subjects using a modified CIPP evaluation model –Context, Input, Process and Product (CIPP) by Stufflebeam et al. (1971). Thus, the purpose of this article was to report the results of an evaluative study on staff training among administrators and teachers for these subjects. Data gathered from 159 administrators and 176 teachers were used to analyse their perception regarding the effectiveness of staff training in TK, LK and RC. Interview and observation data were also presented to support the quantitative findings. Implications and recommendations for teaching and learning as well as for future research are presented and discussed.

Influence of Crosslinking Density on Antioxidant Nanocellulose in Bio-degradation and Mechanical Properties of Nitrile Rubber Composites

Mohamad Nurul Azman Mohammad Taib,Wageeh A. Yehye,Nurhidayatullaili Muhd Julkapli 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1

Nanocellulose antioxidant (Aox-NCC) was used as reinforcement and crosslinking agent in nitrile butadiene rubber (NBR) composites. The crosslinking density and volume of rubber bonded in the matrix were increased up to 3 phr and no significant improvement between 4 phr and 5 phr was recorded. The interactions of gallic acid and NCC was found to occur between the -OH and -COOH groups, as revealed by Fourier Transform Infra-Red (FTIR) and Nuclear Magnetic Resonance (NMR) analysis. Crystallinity index of Aox-NCC was increased more than 11 %, recorded by X-ray diffraction(XRD) analysis. Meanwhile, the thermal stability of Aox-NCC was increased 30 oC, analyzed by thermogravimetry (TG). With the addition of 3 phr Aox-NCC, tensile strength and modulus at 500 % for NBR composites were increased significantly up to 20 %. There was no significant improvement on modulus at 100 %, modulus at 300 %, elongation at break and tear strength. The degradability of NBR composites within 6 months period was improved significantly at 5 phr of Aox-NCC. Increase in carbonyl group after soil burial test with the existence of cracks, voids and degradable parts of NBRcomposites were revealed. This demonstrated that, Aox-NCC plays a secure function to reinforce NBR composites.

Influence of Hydrophobicity of Acetylated Nanocellulose on the Mechanical Performance of Nitrile Butadiene Rubber (NBR) Composites

Mohamad Nurul Azman Mohammad Taib,Wageeh Abdulhadi Yehye,Nurhidayatullaili Muhd Julkapli,Sharifah Bee O. A. Abdul Hamid 한국섬유공학회 2018 Fibers and polymers Vol.19 No.2

Novel acetylation process by substitution of acetic anhydride substitution with hydroxyl groups on nanocellulose (NCC) has been explored to increase its dispersion and interaction in nitrile butadiene (NBR) matrix. The crystallinity index was increased after modification when compared to unmodified NCC, but no significant different with increases of treatment time from 1 hour to 3 hours treatments proven by X-ray diffraction (XRD) results. The Fourier transform infra-red (FTIR)showed the existent of acetyl groups on surface of the NCC after treatment by existent of the peak 1736 cm-1 that attributed to carbonyl groups some peaks were observed at 1430, 1361 and 1248 cm-1 and confirmed on the acetylation process. The nuclear magnetic resonance (NMR) also show the present of acetyl groups by existent of the signal of proton methyl group at 1.90 ppm and new peaks at 5.42, 4.70 and 4.34 ppm, for all ACN samples. The thermal results by thermo gravimetric analysis (TGA) and differential scanning calorimetry (DSC) showed that the acetylated NCCs were 10 % more thermally stable. Transmission electron microscopic (TEM) results showed that no significant changes were observed due to the acetylation process. The results also showed well distributed of individual NCC after acetylation, this improvement was primarily attributed to uniform dispersion of the ACN-NCC and less aggregated occurred. Due to its hydrophobic characteristics, highly crystalline and nano size, ACN-NCC brought a significant improvement up to 25 % on the mechanical properties of nitrile butadiene (NBR) rubber composites.

Optimum cost design of frames using genetic algorithms

Chulin Chen,Salim Taib Yousif,Rabi’ Muyad Najem,Ali Abavisani,Binh Thai Pham,Karzan Wakil,Edy Tonnizam Mohamad,Majid Khorami 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.30 No.3

The optimum cost of a reinforced concrete plane and space frames have been found by using the Genetic Algorithm (GA) method. The design procedure is subjected to many constraints controlling the designed sections (beams and columns) based on the standard specifications of the American Concrete Institute ACI Code 2011. The design variables have contained the dimensions of designed sections, reinforced steel and topology through the section. It is obtained from a predetermined database containing all the single reinforced design sections for beam and columns subjected to axial load, uniaxial or biaxial moments. The designed optimum beam sections by using GAs have been unified through MATLAB to satisfy axial, flexural, shear and torsion requirements based on the designed code. The frames’ functional cost has contained the cost of concrete and reinforcement of steel in addition to the cost of the frames’ formwork. The results have found that limiting the dimensions of the frame’s beams with the frame’s columns have increased the optimum cost of the structure by 2%, declining the re-analysis of the optimum designed structures through GA.

Design and Verification of Improved Cascaded Multilevel Inverter Topology with Asymmetric DC Sources

Tarmizi Tarmizi,Soib Taib,M. K. Mat Desa 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.5

This paper presents the design and implementation of an improved cascaded multilevel inverter topology with asymmetric DC sources. This experimental inverter topology is a stand-alone system with simulations and experiments performed using resistance loads. The topology uses four asymmetric binary DC sources that are independent from each other and one H-bridge. The topology was simulated using PSIM software before an actual prototype circuit was tested. The proposed topology was shown to be very efficient. It was able to generate a smooth output waveform up to 31 levels with only eight switches. The obtained simulation and experimental results are almost identical. In a 1,200W (48.3) resistive load application, the THDv and efficiency of the topology were found to be 1.7% and 97%, respectively. In inductive load applications, the THDv values were 1.1% and 1.3% for an inductive load (R=54 dan L=146mH) and a 36W fluorescent lamp load with a capacitor connected at the dc bus.

Determinants of Choice of Surgery in Asian Patients with Early Breast Cancer in A Middle Income Country

Teh, Yew-Ching,Shaari, Nor Elina Noor,Taib, Nur Aishah,Ng, Char-Hong,See, Mee-Hoong,Tan, Gie-Hooi,Jamaris, Suniza,Yip, Cheng-Har Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.7

Background: Breast-conserving surgery (BCS) plus radiotherapy is equivalent to modified radical mastectomy (MRM) in terms of outcome. However there is wide variation in mastectomy rates dependent both on tumour and patient characteristics. Objective: This study aimed to assess the determinants of surgery choice in Asian patients with early breast cancer in a middle-income country. Materials and Methods: 184 patients with early breast cancer treated between Jan 2008 and Dec 2010 were recruited to complete a questionnaire. Chi-square test was used to analyze the association between surgery choice and demographic and tumour factors, surgeon recommendation, family member and partner opinions, fear of recurrence, avoidance of second surgery, fear of disfigurement, interference with sex life, fear of radiation and loss of femininity. Results: 85 (46%) had BCS while 99 (54%) had mastectomy. Age >60, Chinese ethnicity, lower education level, and larger tumour size were significantly associated with mastectomy. Surgeon recommendation was important in surgery choice. Although both groups did not place much importance on interference with sex life, 14.1% of the BCS group felt it was very important compared to 5.1% in the mastectomy group and this was statistically significant. There was no statistical difference between the two groups in terms of the other factors. When analyzed by ethnicity, significantly more Malay and Indian women considered partner and family member opinions very important and were more concerned about loss of femininity compared to Chinese women. There were no statistical differences between the three ethnic groups in terms of the other factors. Conclusions: When counseling on surgical options, the surgeon has to take into account the ethnicity, social background and education level, age and reliance on partner and family members. Decision-making is usually a collective effort rather than just between the patient and surgeon, and involving the whole family into the process early is important.

Do Clinical Features and Survival of Single Hormone Receptor Positive Breast Cancers Differ from Double Hormone Receptor Positive Breast Cancers?

Ng, Char-Hong,Pathy, Nirmala Bhoo,Taib, Nur Aishah,Ho, Gwo-Fuang,Mun, Kein-Seong,Rhodes, Anthony,Looi, Lai-Meng,Yip, Cheng-Har Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.18

The significance of the single hormone receptor positive phenotype of breast cancer is still poorly understood. The use of hormone therapy has been found to be less effective for this type, which has a survival outcome midway between double positive and double negative phenotypes. The aim of this study was to investigate differences in patient and tumor characteristics and survival between double-receptor positive (ER+PR+), double receptor negative (ER-PR-) and single receptor positive (ER+PR- and ER-PR+) breast cancer in an Asian setting. A total of 1,992 patients with newly diagnosed stage I to IV breast cancer between 2003 and 2008, and where information on ER and PR were available, were included in this study. The majority of patients had ER+PR+ tumors (n=903: 45.3%), followed by 741 (37.2%) ER-PR-, 247 (12.4%) ER+PR-, and 101 (5.1%) ER-PR+ tumors. Using multivariate analysis, ER+PR- tumors were 2.4 times more likely to be grade 3 compared to ER+PR+ tumors. ER+PR- and ER-PR+ tumors were 82% and 86% respectively less likely to be grade 3 compared with ER-PR- tumors. ER-PR+ tumours were associated with younger age. There were no survival differences between patients with ER+PR+ and ER-PR+ tumors. However, ER+PR- tumors have poorer survival compared with ER+PR+ tumours. ER-PR- tumours had the worst survival. Adjuvant hormonal therapy with tamoxifen was found to have identical survival advantage in patients with ER+PR+ and ER-PR+ tumors whereas impact was slightly lower in patients with ER+PR- tumors. In conclusion, we found ER+PR- tumors to be more aggressive and have poorer survival when compared to ER+PR+ tumors, while patients with ER-PR+ tumours were younger, but had a similar survival to their counterparts with ER+PR+ tumours.

Higher Education Policy Reform: The Dilemma of Translating the Philosophy of Higher Education into practice

( Sharifuzah Osman ),( Professor Fauziah Md Taib ),( Associate Professor Dr Siti Nabiha Abdul Khalid ) 한국정책학회 2013 한국정책학회 학술대회 Vol.2013 No.2