Repair of major road embankment failure using reinforced earth (re) wall

A case history of repair works of major road embankment failure along Genting Highlands to Bukit Cincin, Pahang is presented. Failures at 10 locations along Genting Highlands to Bukit Cincin road occurred on 30th October 1997 during the monsoon seasons. The repair works at Location 1 using reinforced earth wall was considered since there was enough space available at the downslope section and also the soil at the downslope section of the failed embankment was strong enough to construct the wall safely. This paper fully explained the details remedial works using reinforced earth wall at Location 1

Pull out characteristics of soil nails in Pahang / Damanhuri Jamalludin ...[et al.]

A total of 45 locations of slope failures occurred along Jalan Baru Gap to Fraser Hill, Pahang. Of the 45 locations of slope failures, only 31 locations were repaired using soil nails. At each location, only one pull out test was carried out. This study involved the results of the pull out tests at all the 31 locations and the results were obtained from Public Works Department, K.L. The maximum pull out load during the test was 90 kN and the displacement at 90 kN load must be less than 10mm for the test to be considered satisfy the specifications. The main purpose of this study is to determine the characteristics of the pull out test on soil nail and the interaction between the soil nail and the soil

Removal of zinc from aqueous solution by optimized oil palm empty fruit bunches biochar as low cost adsorbent

This study aims to produce optimized biochar from oil palm empty fruit bunches (OPEFB), as a green, low cost adsorbent for uptake of zinc from aqueous solution. The impact of pyrolysis conditions, namely, highest treatment temperature (HTT), heating rate (HR), and residence time (RT) on biochar yield and adsorption capacity towards zinc, was investigated. Mathematical modeling and optimization of independent variables were performed employing response surface methodology (RSM). HTT was found to be the most influential variable, followed by residence time and heating rate. Based on the central composite design (CCD), two quadratic models were developed to correlate three independent variables to responses. The optimum production condition for OPEFB biochar was found as follows: HTT of 615°C, HR of 8°C/min, and RT of 128 minutes. The optimum biochar showed 15.18 mg/g adsorption capacity for zinc and 25.49% of yield which was in agreement with the predicted values, satisfactory. Results of the characterization of optimum product illustrated well-developed BET surface area and porous structure in optimum product which favored its sorptive ability

Chemical Reduction Behavior of Zirconia Doped to Nickel at Different Temperature in Carbon Monoxide Atmosphere

The reduction behavior of nickel oxide (NiO) and zirconia (Zr) doped NiO (Zr/NiO) was investigated using temperature programmed reduction (TPR) using carbon monoxide (CO) as a reductant and then characterized using X-ray diffraction (XRD), nitrogen absorption isotherm using BET technique and FESEM-EDX. The reduction characteristics of NiO to Ni were examined up to temperature 700 °C and continued with isothermal reduction by 40 vol. % CO in nitrogen. The studies show that the TPR profile of doped NiO slightly shifts to a higher temperature as compared to the undoped NiO which begins at 387 °C and maximum at 461 °C. The interaction between ZrO2 with Ni leads to this slightly increase by 21 to 56 °C of the reduction temperature. Analysis using XRD confirmed, the increasing percentage of Zr from 5 to 15% speed up the reducibility of NiO to Ni at temperature 550 °C. At this temperature, undoped NiO and 5% Zr/NiO still show some crystallinity present of NiO, but 15% Zr/NiO shows no NiO in crystalline form. Based on the results of physical properties, the surface area for 5% Zr/NiO and 15% Zr/NiO was slightly increased from 6.6 to 16.7 m2/g compared to undoped NiO and for FESEM-EDX, the particles size also increased after doped with Zr on to NiO where 5% Zr/NiO particles were 110 ± 5 nm and 15% Zr/NiO 140 ± 2 nm. This confirmed that the addition of Zr to NiO has a remarkable chemical effect on complete reduction NiO to Ni at low reduction temperature (550 °C). This might be due to the formation of intermetallic between Zr/NiO which have new chemical and physical properties

Effects of pyrolysis temperature on the physicochemical properties of empty fruit bunch and rice husk biochars

Biochar has received great attention recently due to its potential to improve soil fertility and immobilize contaminants as well as serving as a way of carbon sequestration and therefore a possible carbon sink. In this work, a series of biochars were produced from empty fruit bunch (EFB) and rice husk (RH) by slow pyrolysis at different temperatures (350, 500, and 650°C) and their physicochemical properties were analysed. The results indicate that porosity, ash content, electrical conductivity (EC), and pH value of both EFB and RH biochars were increased with temperature; however, yield, cation exchange capacity (CEC), and H, C, and N content were decreased with increasing pyrolysis temperature. The Fourier transform IR spectra were similar for both RH and EFB biochars but the functional groups were more distinct in the EFB biochar spectra. There were reductions in the amount of functional groups as pyrolysis temperature increased especially for the EFB biochar. However, total acidity of the functional groups increased with pyrolysis temperature for both biochars

Removal of Zinc from Aqueous Solution by Optimized Oil Palm Empty Fruit Bunches Biochar as Low Cost Adsorbent

This study aims to produce optimized biochar from oil palm empty fruit bunches (OPEFB), as a green, low cost adsorbent for uptake of zinc from aqueous solution. The impact of pyrolysis conditions, namely, highest treatment temperature (HTT), heating rate (HR), and residence time (RT) on biochar yield and adsorption capacity towards zinc, was investigated. Mathematical modeling and optimization of independent variables were performed employing response surface methodology (RSM). HTT was found to be the most influential variable, followed by residence time and heating rate. Based on the central composite design (CCD), two quadratic models were developed to correlate three independent variables to responses. The optimum production condition for OPEFB biochar was found as follows: HTT of 615°C, HR of 8°C/min, and RT of 128 minutes. The optimum biochar showed 15.18 mg/g adsorption capacity for zinc and 25.49% of yield which was in agreement with the predicted values, satisfactory. Results of the characterization of optimum product illustrated well-developed BET surface area and porous structure in optimum product which favored its sorptive ability

Glosari Industri Petroleum - Edisi Kedua

Glosari Industri Petroleum (Edisi Kedua) ini mengandungi 1805 istilah sumber (bahasa Inggeris/BI) dan 1748 istilah sasaran (bahasa Melayu/BM). Istilah dalam glosari ini telah dikumpuikan oleh pakar dari Universiti Malaya (UM), Universiti Teknologi Malaysia (UTM), dan Petroliurn Nasional Bcrhad (Petronas). (i) Prof. Madya Dr. Ariffin Samsuri (UTM) ( (ii) Prof. Madya Dr. Ahmad Kamal Idris (UTM),(iii) Dr. Nik Meriam Sulaiman (UM)(iv) In Ahmad Nordeen Hj. Mohd. Salleh (Petronas) (v) Encik Mahbob Haji Abdul Manan (Petronas) Senarai istilah ini kemudiannya disemak dan disenaraikan oleh pegawai projek Dewan Bahasa dan Pustaka (DBP) untuk disahkan oleh sekumpulan pakar dalam bidang/subbidang Industri Petroleum menerusi Jawatankuasa Istilah (JKI) Industri Petroleum yang ditubuhkan pada 21 Jun 1994. Sebanyak 38 sesi mesyuarat dalam edisi pertama dan 28 sesi mesyuarat dalam edisi kedua telah diadakan. Anggota JKI Industri Petroleum yang mengesahkan istilah adalah seperti yang berikut: (i) Prof. Madya Dr. Ariffin Samsuri (UTM/Pengerusi) (ii) Prof. Madya Dr. Ahmad Kamal Idris (UTM/Timbalan Pengerusi) (iii) Puan Hajah Rajnah Allapitchay (DBP/Setiausaha) (iv) Dr. Nik Meriam Sulaiman (UM) (v) Encik Mahbob Haji Abdul Manan (Petronas)

Textile diamond dipoles for body centric communications at 2.45ghz and 5.8ghz

This study proposes textile diamond dipoles for body centric communication that operate at 2.45GHz and 5.8GHz. The proposed antennas have been rigorously tested under wearable and body centric measurements. Both substrates and conducting parts of the diamond dipoles are entirely made of textiles; which is deemed fit for wearable communications. Experiments such as bending, wetness and SAR were performed to investigate the antennas’ performance for body communication realization. Bending was found not to cause any significant performance disruption. On the other hand, since the proposed antenna is not made of water-proof material, the performance was distorted under wet condition. However, once the antenna was dried out, the original performance was achieved. SAR measurement was also conducted and significant SAR values were observed when placing the proposed diamond dipoles close to human body

Glosari Industri Petroleum

Glosari Industri Petroleum ini mengandungi 1365 istilah sumber (bahasa Inggeris/BI) dan 1308 istilah sasaran (bahasa Melayu/BM). Istilah dalam glosari ini telah dikumpulkan oleh beberapa orang pakar dari Universiti Teknologi Malaysia (UTM), Universiti Malaya (UM), dan Petronas yang dianggap profesional. Mereka yang terlibat ialah: (i) Prof. Madya Dr. Ariffsn Samsuri (ii) Prof. Madya Dr. Ahmad Kamal Idris (iii) Prof. Madya Sanat Md. Nasir (iv) Dr. Nik Meriam Sulaiman (v) Ir. Ahmad Nordeen Hj. Mohd. Salleh (vi) Encik Mahbob Haji Abdul Manan (Petronas) (Petronas) dan pada mereka kemudiannya disemak dan disenaraikan oleh pegawai projek Dewan Bahasa dan Pustaka (DBP) untuk disahkan oleh sekumpulan pakar yang mahir dalam bidang/subbidang Industri Petroleum menerusi Jawatankuasa Istilah (JKI) Industri Petroleum yang ditubuhkan pada 21 Jun 1994. Sebanyak 38 sesi mesyuarat telah diadakan. Mesyuarat intensif juga telah diadakan di peringkat pengesahan untuk tujuan penerbitan. Senarai akhir ahli JKI Industri Petroleum adalah seperti yang berikut: (i) Prof. Madya Dr. Ariffin Samsuri (Pengerusi/UTM) (ii) Prof. Madya Dr. Ahmad Kama] Idris (Timbalan Pengerusi/UTM) (iii) Puan Hasnah Mohamad (Setiausaha/DBP)