Synthesis, magnetic properties and microstructure of Ni–Zn ferrite by sol–gel technique

In the study, the Ni–Zn ferrite powder of a Ni0.3Zn0.7Fe2O4 composition was synthesized by sol–gel route using metal acetates at low temperatures. Both the scanning electron microscope and X-ray diffraction analyses of various gel samples heated at different temperatures were used to identify the reaction stages where the amorphous-gel-to-crystalline phase transition occurred. The electrical, magnetic and microstructural properties of the toroidal cores were studied. It was found that the initial permeability increased with a large frequency band (0.1–31.39 MHz) and the magnetic loss was small. The electrical resistivity was higher as compared to the ones which were obtained by the conventional process. Therefore, well–defined polycrystalline microstructure nickel–zinc ferrite and a short processing time of gel preparation have become the major achievements of this study

A comparative study of nickel–zinc ferrites by sol–gel route and solid-state reaction

The properties of ferrites are affected by the microstructural problems which have become the most serious obstacles in obtaining high quality reproducible ferrites. In this study, the nickel–zinc ferrites were prepared via two different methods: the conventional classical ceramic method known as the solid-state reaction, and the newer sol–gel method. The electromagnetic and microstructural properties of both different samples were also discussed. A higher electrical resistivity and controlled initial permeability with a smaller loss were found in the sol–gel samples. Consequently, the homogenous microstructure and the advantages in terms of powder and sample preparations have been discovered by means of sol–gel technique

Physical tourism potentials in Mubi Town, Adamawa State, Nigeria

World tourism is the fastest growing industries in the world that among others provides multi-million jobs opportunities; assisting in the significant infrastructure development and cross-cultural appreciations. It also supports revenue generation to governments at all levels and serves as the most contributing sector to many countries of the world. Thus, this paper carries out an empirical investigation of the physical tourism potentials of Mubi Town, Adamawa State, Nigeria. Primary data was collected through a well-structured questionnaire survey using five grading scale, and site observations of the physical tourism potentials. A total of 100 residents were selected as the respondents via random sampling technique. The research discovered six significant physical tourism potentials out of 12, namely; Tike Cattle Market, Wednesday Market, traditional local industries, Emir Palace, two minarets of Central Mosque, and River Yadzram. The analysis for the reliability test was also carried out using Spearman correlation techniques between the various segments of the questionnaire. This is based on the respondents’ responses to ascertain the level of the reliability. The descriptive statistics were used to correlate the relationship between Physical Tourism Potentials (PTP) and Environmental Elements (EE) of the study area. The result demonstrates the correlation between PTP and EE is highly significant at (0.01, 2-Tailed), indicating that, the Physical Tourism Potentials (PTP) in Mubi Town plays an integral role in the tourism potentials of the town

Preparation of Ni–Zn–Cu ferrite particles by sol–gel technique

Ni–Zn–Cu ferrite powders of Ni0.3Zn0.6Cu0.1Fe2O4 composition were synthesized by sol–gel method at low temperatures. Scanning electron microscope (SEM) and X-ray diffraction (XRD) analyses of various gel samples heated at different temperatures helped in identifying the reaction process and the stages where amorphous-gel-to-crystalline phase transition occurred. The powders were used to make ferrite cores and their microstructure was compared with those obtained by the classic ceramic process. The spinel cubic structure Ni–Zn–Cu ferrite was found to form at the temperature of 700 °C with a calcination time of 4 h. Short processing time of gel preparation, homogeneity and well defined polycrystalline microstructure with small grain size were achieved in this study

Titah ucapan pembukaan Dewan Undangan Negeri Kelantan oleh Sultan Muhammad V: satu analisis retorik

Kajian ini merupakan penelitian aspek retorik dalam titah ucapan KDYMM Sultan Muhammad V, Sultan Kelantan ke-29. Objektif kajian ini adalah untuk mengenal pasti teknik retorik dalam teks rasmi diraja, untuk menganalisis dan menghuraikan aspek penggunaan kosa kata, kekuatan dan keberkesanan seni pengucapan Sultan Muhammad V. Data kajian ini dianalisis secara kuantitatif untuk meneliti peratusan penggunaan teknik retorik, dan secara kualitatif, iaitu dengan huraian deskriptif teks berlandaskan prinsip ketiga teori retorik moden Enos dan Brown (1993), iaitu untuk memberikan kesan mendalam terhadap ujaran atau penulisan. Sebanyak 251 ayat telah dicerakinkan daripada tiga teks ucapan, di samping terdapat 27 jenis teknik retorik yang telah dikenal pasti dengan ditandai ungkapan tertentu berdasarkan kategori Lakuan Bahasa. Hasil kajian mendapati bahawa Sultan Muhammad V menggunakan beberapa elemen retorik dalam titah ucapannya, iaitu aliterasi, polisindeton, repitisi, soalan retorik, metafora, simile, alusi, dan kosa kata asing daripada bahasa Inggeris dan bahasa Arab. Teknik dan elemen yang dimanfaatkan dalam pengucapan ini mampu memberikan kesan terhadap kefahaman khalayak

Mix design for self-compacting palm oil clinker concrete based on particle packing

The consumption of waste materials in self-compacting concrete (SCC) in the construction industry will not only help to conserve the natural resources but also promote sustainability in preserving the environment. Palm oil clinker (POC) is a waste by-product from the incineration process of oil palm shells and fibres. They are porous and lightweight in nature, which makes them suitable for use as a lightweight aggregate (LWA). In this study, a new procedure was employed to obtain the mix design based on the particle packing (PP) concept to ensure the fresh and hardened properties of SCC are achieved. The actual packing level of aggregate and paste volume is integrated into the proportioning method to obtain the final mix design. The proposed procedure was verified by evaluating the SCC formed for self-compactability and mechanical properties. Based on the overall performance of fresh and hardened properties, it can be deduced that the procedure satisfied the requirements for SCC. The satisfactory results indicate that the mix design can be employed not only for POC but also for a variety of combinations of aggregate. © 2013 Elsevier Ltd

Angiotensin II receptor blocker valsartan enhances glucose-induced insulin secretion

A number of antihypertensive drugs are known to be diabetogenic. This may contribute to less than expected decrease in the incidence of coronary heart disease with reduction in blood pressure with treatment in hypertensive patients. This study was aimed to determine the effects of a member, Valsartan, of a new class of drugs, angiotensin II receptor blocker, on glucose induced insulin secretion. Male albino rat pancreases were used. The isolated ancreases were perfused with Kreb's solution containing bovine albumin (200 mg/dl) with low glucose (60 mg/dl) followed by high glucose (300 mg/dl) at a rate of 4 ml/min. The dose of Valsartan used was based on the peak plasma level achieved in human at standard single oral dose of 80 mg daily, which was 1.64 mg/L. Five treatment groups were used: Control group, Valsartan at 10%, Valsartan at 100% and Valsartan at 10 times of the 1.64 mg/L, and Diazoxide 10 μg/ml group. Insulin levels in the perfusate were measured by radioimmunoassay. Valsartan at all concentrations significantly increases glucose induced insulin secretion (p < 0.05). Valsartan at 10 %, Valsartan at 100% and Valsartan at 10 times of the 16.4 mg/L, increases glucose induced insulin secretion by 226.4 %, 161.7 % and 156.3 %, respectively. Diazoxide, significantly inhibits glucose induced insulin secretion (p < 0.05). Valsartan at all concentrations enhances glucose-induced insulin secretion in isolated rat pancreas technique

Study on Postgraduate Student Preferred / Dislike Teaching/Learning Techniques: A Case Study of a Private University in Malaysia

This paper examine preferred / dislike teaching/learning techniques among postgraduate student at a Malaysian university. Past studies had indicated the promotion of students’ “graduateness”, responsibility lies in the hand of teachers who need to know what are in the mind of student with regards to their most preferred or non preferred learning and teaching style. 57 returned questionnaires were accepted and coded, and subject to further analysis with a response rate of 73 percent from the private university. The result revealed that the highest ranked technique most preferred by the students was “interactive lecture by instructor and the most dislike technique was formal lecture by instructor. Significant finding was that though there were some differences within the different disciplines, some commonalities seem to be present. Future study should consider alternative modes of enquires such as employing the longitudinal method of data collection design and a nationwide survey covering samples from the whole population of the higher institutions of learning in Malaysia that would be more significant in making generalizations

Exploring the role of religious motivation towards tourist satisfaction: a proposed Islamic tourism model from a Malaysian perspective

The purpose of the study is to identify factors influencing tourist satisfaction of Islamic tour destination under the Islamic tourism concept. The study is conceptual in nature.It develops a Tourist Satisfaction Model derived from the comprehensive literature review and prior empirical findings where the relationships among Religious Motivation, Destination Selection, Destination Image, Perceived Value, Service Quality and Tourist Satisfaction are depicted. The theoretical supports of this research provides justifiable evidence that the proposed Tourist Satisfaction Model is acceptable. The research indicates that Malaysia as an Islamic tourism Destination haswide acceptance to the Muslim tourists all around the world. A further study can be addressed to test the model empirically and configure relative importance of the causing factors behind the tourist satisfaction. The proposed model may give the practitioners a way to develop their destination as an Islamic tourism center while academician can find a comprehensive model to test for the specific destination. Key words: Tourist Satisfaction, factor influencing, Islamic Tourism and Malaysi