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Recent Decisions in

Technologies for

Sustainable Development

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Recent Decisions in

Technologies for Sustainable

Development

Selected, peer reviewed papers from the

3

rd

International Conference on

Sustainable Technology Development

(ICSTD 2014),

October 30-31, 2014, Bali, Indonesia

Edited by

A. Ghurri, N.P.G. Suardana, N. N. Pujianiki,

I. N. Arya Thanaya, A.A. Diah Parami Dewi,

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Copyright  2015 Trans Tech Publications Ltd, Switzerland

All rights reserved. No part of the contents of this publication may be reproduced or transmitted in any form or by any means without the written permission of the

publisher.

Trans Tech Publications Ltd Churerstrasse 20

CH-8808 Pfaffikon Switzerland

http://www.ttp.net

Volume 776 of

Applied Mechanics and Materials ISSN print 1660-9336

ISSN cd 1660-9336 ISSN web 1662-7482

Full text available online at http://www.scientific.net

Distributed worldwide by and in the Americas by

Trans Tech Publications Ltd Trans Tech Publications Inc. Churerstrasse 20 PO Box 699, May Street CH-8808 Pfaffikon Enfield, NH 03748

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Preface

This volume was selected from papers presented at the 3rd International Conference on Sustainable Technology Development (ICSTD Bali 2014), which have been held in Udayana University Bali during October 30-31, 2014. The conference was organized by Faculty of Engineering, University of Udayana Bali Indonesia. This conference covered wide range of engineering issues toward the achievement of sustainablility.

In order to meet high standard of Applied Mechanics and Materials, the organization committee has made their efforts to do the following things. Firstly, all submitted papers have been reviewed by 2 anonymous expert reviewers, poor quality papers have been rejected after reviewing. Secondly, periodically review meetings have been held around the reviewers about three times for exchanging reviewing suggestions. Finally, the conference organization had several preliminary sessions before the conference. Through efforts of the scientific committee and Editors team, the volume will be the best collected papers.

We would like to thank the Faculty of Engineering, University of Udayana, the member of organizing and scientific committees, and also to TTP publisher.

Editors

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Table of Contents

Preface

Chapter 1: Technologies of Sustainable Development in Civil

Engineering, Transportation and Urban Planning

Sustainable Development of Concrete Using GGBS: Effect of Curing Temperatures on the Strength Development of Concrete

G. Turu'allo 3

Properties of Sand Sheet Asphalt Mixture Incorporating Waste Plastic

I.N.A. Thanaya, I.G.R. Purbanto and I.G. Wikarga 9

Asphalt Pavement Temperature Profile for Tropical Climate in Indonesia

I.M.A. Ariawan, B.S. Subagio and B.H. Setiadji 17

The Development of Slurry Seal Design with Ordinary Portland Cement Replacement by Low Calcium Fly Ash

A. Setyawan, D. Sarwono and M.S. Adnan 24

The Structural Properties Assessment of Thin Hot Mixture Asphalt for Pavement Preservation

A. Setyawan, A.H. Mustafa Elshawesh and S. As'ad 30

Mechanical Strength of Hydraulic Binder Made by Blending Type I Portland Cement and Pozzolan

I.M.A.K. Salain 36

Laboratory Tests on Failure of Retaining Walls Caused by Sinusoidal Load

A.M. Hidayati, R.W. Sri Prabandiyani and I.W. Redana 41

Deformation Behavior of Concrete due to the Influence of the Steel Ring Width Variations as the External Confinement

E. Safitri, I. Imran, Nuroji and S. Asa'ad 47

Evaluation of High Grade Recycled Coarse Aggregate Concrete Quality Using Non- Destructive Testing Technique

N.N. Kencanawati, J. Fajrin, B. Anshari, Akmaluddin and M. Shigeishi 53

Experimental and Theoretical Investigation of Bolted Bamboo Joints without Void Filled Material

G.M. Oka, A. Triwiyono, A. Awaludin and S. Siswosukarto 59

The Significant Importance to Measure Road Safety

S.A. Caroline 66

Accessibility to Location of Activities in Denpasar City, Bali-Indonesia

P.A. Suthanaya 74

Travel Time Estimation Based on Spot Speed with Instantaneous and Time Slice Model

A.M.H. Mahmudah, A. Budiarto and S.J. Legowo 80

Port Location Selection Model: Case Study of Tourism Sector in Bali

R.M.N. Budiartha, T. Achmadi and D. Manfaat 87

Determining Passenger Car Equivalent for Motorcycle at Mid-Block of Sesetan Road

I.G.R. Purbanto 95

Readiness Criteria: Indonesias’ New Initiative to Ensure Sustainable Development Program

A. Merthayasa 101

Conceptual Framework of Bidding Strategy in Order to Improve Construction Project Performance

I.N.Y. Astana, H.A. Rusdi and M.A. Wibowo 108

The Conceptual Framework of Design Change Effects in Some Project Delivery Systems

A.A.G.A. Yana, H.A. Rusdi and M.A. Wibowo 114

An Identification of Construction Project Overheads for Sustainable Cost Management and Controlling Practices (CMCPs)

N.M. Jaya and A. Frederika 121

Risk Analyses for Riau Regional Water Supply Projects (SPAM), Indonesia

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b Recent Decisions in Technologies for Sustainable Development

Modeling Discharge of the Bangga Watershed under Climate Change

I.W. Sutapa, M. Bisri, Rispiningtati and L. Montarcih 133

Water Resources Management of Subak Irrigation System in Bali

I.N. Norken, I.K. Suputra and I.G.N.K. Arsana 139

Study of the Evolution of Sanur Beach Nourishment Project for Beach Enhancement

I.G.B.S. Dharma and S.S. Efendi 145

Numerical Simulation of Breaking Waves in a Wave Group by SPH

N.N. Pujianiki 151

The Study on Bore Piles Foundation of the Reinforced Concrete Arch Bridge Beams of Tukad Pekerisan and Tukad Penet

I.N. Sutarja and I.W. Wayan Redana 157

The Importance of the Physical Boundary Line onBali Coastal Tourist Resorts

A. Rajendra, N. Temple and R. Nicholls 163

Comparative Analysis of Traditional House at Taman Mini Indonesia Indah with Modern House

S.Purnawan, I.W. Sukania and L. Widodo 169

Chapter 2: Materials and Technologies for a Sustainable Development

The Property and Applicability to Auto Industry of Natural Fiber Reinforced Composites

R.H. Hu, Z.G. Ma, S. Zheng, C.L. Zheng and A.J. Jiang 179

Fracture Parameters of Short Carbon Fiber Reinforced Polycarbonate Composite Fabricated by Injection Molding Process

M.G. Hwang, G.H. Kim, H.J. Park, Y.G. Lee, C.M. Yang, J.K. Lim and H.Y. Kang 186

Effect of Polar Extract of Cocoa Peels Inhibitor on Mechanical Properties and Microstructure of Mild Steel Exposed in Hydrocloric Acid

Gunawarman, Y. Yetri, Emriadi, N. Jamarun, Ken-Cho, M. Nakai and M. Niinomi 193

Hardness Distribution and Effective Case Depth of Low Carbon Steel after Pack Carburizing Process under Different Carburizer

D.N.K.P. Negara, I.D.M.K. Muku, I.K.G. Sugita, I.M. Astika, I.W. Mustika and D.G.R. Prasetya 201

The Effect of Solidification on Acoustical of Tin Bronze 20Sn Alloy

I.K.G. Sugita and I.G.N. Priambadi 208

Morphological Analyses and Crystalline Structures of Anodic TiO2 Thin Film on Ti6Al4V

Alloy Using Phosphate and Calcium Containing Electrolyte under Different Voltage and Calcium Molarity

I.N.G. Antara, K.I.M. Gatot, I.M. Budiana and D.K. Choi 215

Determination of Optimal Clinker Factor in Cement Production by Chemical Grinding Aids Addition

T.Eryanto and E. Amrina 223

Wear of Carbon Steel (0.65%C) in Rolling-Sliding Contact with Creep Ratio

M. Widiyarta, T.G.T. Nindhia and H. Mudiastrawan 229

Hardness Prediction Based on P-h Curves and Inverse Material Parameters Estimation

I.N. Budiarsa 233

The Influence of Austenisation Temperature and Holding Time on Mechanical Properties, Scale Thickness, and Microstructure in Alloy Steel

A. Aziz, M. Hidayat and I. Hardiyanti 239

Hardness, Density and Porosity of Al/(SiCw+Al2O3p) Composite by Powder Metallurgy

Process without and with Sintering

K. Suarsana and R. Soenoko 246

Development of Fiberglass Woven Roving Composite as an Alternative Material for the Hull of Fishing Boat

Winarto, W. Eddy, R. Liza and H. Syamsul 253

Tensile Strength of Banana Fiber Reinforced Epoxy Composites Materials

A.P. Irawan and I.W. Sukania 260

Green Composites Based on Recycled Plastic Reinforced Local Sisal Fibers

N.P.G. Suardana, N.M. Suaniti and I.P. Lokantara 264

Cement Bonded Sol-Gel TiO2 Powder Photocatalysis for Phenol Removal

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Applied Mechanics and Materials Vol. 776 c

Review on Zn-Based Alloys as Potential Biodegradable Medical Devices Materials

M.S. Dambatta, D. Kurniawan, S. Izman, B. Yahaya and H. Hermawan 277

Bone Implant Materials from Eggshell Waste

I. Sopyan 282

Boiling Phenomenon of Tabulate Biomaterial Wick Heat Pipe

W.N. Septiadi and N. Putra 289

Fluidization Characteristic of Sewage Sludge Particles

I.N.S. Winaya, R.S. Hartati and I.N.G. Sujana 294

Design of Fluidized Bed Co-Gasifier of Coal and Wastes Fuels

I.N.S. Winaya, R.S. Hartati, I.P. Lokantara, I.G. Subawa and I.M.A. Putrawan 300

Chapter 3: Advanced Decisions in Mechanical Engineering

Magnetic Camera and its Applications in Aging Aircraft, Express Train and Pipelines for Green Technology

J.Y. Lee and J.M. Kim 309

Buckling Analysis on Pechiko Field of Fixed Offshore Platform in Makassar Strait

M.Z.M. Alie, Y.R. Palentek and D.G. Sesa 313

Simulation of a Differential-Drive Wheeled Mobile Lego Robot Mindstorms NXT

I.W. Widhiada, C.G.I. Partha and Y.A.P. Wayan Reza 319

Design and Simulation of Five Fingers Gripper for Dexterous Pick-Up Various of Components

I.W. Widhiada, E. Pitowarno, C.G.I. Partha and Y.A.P. Wayan Reza 325

Tar Balls Collector for Mechanical Recovery in Combating Oil Spill on the Marine Environment

C.P. Mahandari, M. Yamin and D.S.A. Asandi 331

Three Wheel Bike as Physical Therapy Equipment for Post-Stroke Patient

I.M.L. Batan, Rodika and M. Riva'i 337

Geometric Progression Application in Design Transmission Gear Ratio

A.A.I.A.S. Komaladewi, I.G.A.K. Suriadi and I.K.A. Atmika 343

Role of Risk Management in Effective Maintenance

H.A. Yuniarto and P.F. Paristiawati 349

Redesign Combustion Air Shelter of the Furnace to Improve the Performance in Melting Bronze for Manufacturing Gamelan

I.G.N. Priambadi, I.K.G. Sugita, A.A.I.A.S. Komaladewi, K. Astawa and I.W.B. Adnyana 355

Model of Carbon Dioxide (CO2) Emission from Motorcycle to the Manufactures, Engine

Displacement, Service Life and Travel Speed

A.M. Mulyadi and S. Gunarta 361

Experimental Study of Heat Transfer Characteristics of Condensed Flow on the Vertical Wave Plates

W.H. Piarah and Z. Djafar 371

Forces Analysis on a Spherical Shaped Delivery Valve of Hydram Pump

M. Suarda 377

The Influence of Distance Variation between Rings with Sloping Position on the Cylinder Surface to Drag Coefficient

S.P.G.G. Tista, A. Ghurri and H. Wijaksana 384

Auto PID Tuning of Speed Control of DC Motor Using Particle Swarm Optimization Based on FPGA

H. Tayara, D.J. Lee and K.T. Chong 390

Mobile Robot Motion Planning to Avoid Obstacle Using Modified Ant Colony Optimization

N. Habib, A. Soeprijanto, D. Purwanto and M.H. Purnomo 396

Mobile Robot Motion Control Using Laguerre-Based Model Predictive Control

M. Chipofya, D.J. Lee and K.T. Chong 403

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Applied Mechanics and Materials Vol 776 (2015) pp 289-293 Submitted: 2015-02-17 © (2015) Trans Tech Publications, Switzerland Accepted: 2015-04-10 doi:10.4028/www.scientific.net/AMM.776.289

Boiling Phenomenon of Tabulate Biomaterial Wick Heat Pipe

Wayan Nata Septiadi

1,a

, Nandy Putra

2,b

1

Department of Mechanical Engineering, University of Udayana, Kampus Bukit Jimbaran, Bali - Indonesia

2

Heat Transfer Laboratory, Department of Mechanical Engineering, University of Indonesia Kampus UI-Depok 16424 Indonesia

a

wayan.nata@gmail.com, bnandyputra@eng.ui.ac.id

Key Words: heat pipe, wick, biomaterial

Abstract. This research purposed to know the performance of heat pipe using wick made from biomaterial. Biomaterial (Coral) is the porous media which has the relative homogenous and small porous structures. The homogenous structures and the small biomaterial have the better capillarity and could be used as wick to circulate condensate in heat pipe. The heat pipe made from copper pipe with 50 mm in length and the inside and outer diameter was 25 mm and 24 mm in each, with the wick as thick as 1 mm made from Tabulate. Heat sink was adhered to the condenser part of heat pipe as wide as 637.5 cm2. The study was the observation of phenomena in porous media boiling between biomaterials with solid copper, in which the observations were made by using High Speed Video Camera (HSVC). Tabulate biomaterial has the porous structure which quite homogeny and the best capillary energy. The biomaterial as wick heat pipe could keep the condition of heat pipe from easily reachs the transition condition.

Introduction

Since the earlier of invention of electronic technology, the production of heat flux is on the increase and this trend is expected to increase provided that the development of the electronic is always occurred (Chein et al., 2004). The high amount of heat flux was produced by electronic equipment give vast challenge to researchers in thermal area to manage this problem (Solomon et al., 2012). The use of cooler systems which set to work through two phases is greatly used because the heat transfer through these two phases is better than another cooler system with mono phase such as heat sink, heat sink fan and liquid cooling block. The combination of porous media in cooler equipment with two phase also become to use especially as the capillary porous to circulate the working fluid. Heat pipe it has excellent ability of dissipating heat through the working fluid phase change.

In addition to working fluid, material, dimension, and form, one of the determinations of heat pipe performance is wick (Reay et al., 2006). Wick plays important rules in working fluid circulation especially when condensate process returns to the evaporator site. Wick in heat pipe is a capillary structure and an artery which function as a returning canal from the working fluid of condenser to the evaporator site through adiabatic site (Mudawar, 2001). Therefore, wick plays an important role in heat pipe (Weibel et al., 2010). There are variety of wick, starting from screen mesh, sintered powder, groove, and wire which all made from metal, composite, ceramic and biomaterial (Harris, 2008; Li et al., 2010; Deng et al., 2013; Kempers et al., 2008; Putra et al., 2013).

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290 Recent Decisions in Technologies for Sustainable Development

level from wick. K.C Leong et al. (1997) also had characterized the effect of sintering temperature (800oC and 1000oC) and sintering time to the porosity of wick. There are also lots of researches have been done relating to wick heat pipe (Mishra et al., 2010; Tang et al., 2010; Holley et al., 2006; Lago et al., 2001).

Biomaterial (Coral) is the porous media which has the relative homogenous and small porous structures. This homogenous structures and the small biomaterial have the better capillarity and could be used as wick to circulate condensate in heat pipe. The proposed of this research is to study the performance of heat pipe in applying biomaterial as the base material of wick.

Methods

The preparation of biomaterial and solid cupper wick

Wick heat pipe made from tabulate biomaterial and the average of the mean pour diameter ± 52.95 µm obtained from the test results of SEM, as it could be seen from figure 1. Figures show that the pore structure of tabulate biomaterials quite homogeneous with the pore diameter range is from 20 µm to 60 µm. Wick had 50 mm in length, and 15 mm and 14 mm in diameter respectively. Wick also made with solid copper which is formed of the same size.

Fig 1. (a) Biomaterial wick and (b) The picture of SEM biomaterial

Experimental set-up

[image:11.595.116.484.569.713.2]

Boiling phenomena observed using boiling tubes made of phyrex and using water distillated as the working fluid. The cathride heater is submerged in water used as a heat source with load variation is set by using a DC-power supply.

Fig. 2 Experimental set-up

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Applied Mechanics and Materials Vol. 776 291

each of pieces on the surface and the working fluid. Data measured from the thermocouple was recorded using c-9174 DAQ and NI module 9211. The pattern and diameter size of the bubbles was recorded by using High Speed Video Camera (HSVC), as show in the figure 2.

Result and Discussion

The phenomenon of bobble and nucleic form could be seen at Figure 3. The comparison between heaters without wick biomaterial is studied to analyze the boiling phenomenon in heat pipe owing to the use of this biomaterial wick. The occurrence of heat flux and the bobble condition and boiling nucleic is the observation aspect in this study. Heater without the porous layer of biomaterial wick could be a data base that was observed to compare the difference of the temperature between the heater wall and heater with the water temperature at the saturation condition with the use of the quiet homogenous porous media. It also could be seen from the picture that the bobble structure was small and relative similar to the use of wick biomaterial, compared to without the use of biomaterial wick at the heater surface. At the same heat flux, the boiling at the heater without biomaterial wick was about to fuse and form the big bobble. The fuse of this bobble became bigger and this condition was not effective because the temperature of the wall surface will increase so that the difference of temperature between wall temperature and saturation temperature would also increase.

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292 Recent Decisions in Technologies for Sustainable Development

Fig 4. The comparation of calor flux and the different temperature between heater without and with wick biomaterial

Figure 4 shows the deviation of temperature (∆T) decreased when the boiling nucleic start to appear and detach from the wall surface. In this heat transfer, the transient condition could be prevented. This is a condition which the deviation of temperature was considerable high but the heat flux was the lowest. The figure shows that with the addition of a porous media in tabulate biomaterial, the heat flux was relative to the smooth metal surface can be achieved in the temperature difference between the wall and the temperature saturation of the smaller working fluid. The The small and uniform bubbles are formed continuously on the biomaterials due to a fairly homogeneous pore structure. The existence of bubbles that relatively uniform and easily detached to the surface results the heat from the evaporator can be transferred quickly to the condenser.

Thus, the addition of porous media like biomaterial which has the homogenous porous could keep the heat pipe from easily reach the transition condition. The same view was also conducted by Justin A et al. (2012) which tried to study the boiling from the heater using sintered powder at its surface.

Conclusion

Wick is one of the crucial factor in increasing the performance of heat pipe. The homogenous and the refined porous structure could increase the capillary energy of the porous media which is used as the wick heat pipe. Tabulate biomaterial has the porous structure which quite homogen and the best capillary energy. The biomaterial as wick heat pipe could keep the condition of heat pipe from easily reach the transition conditon.

Acknowledgements

[image:13.595.162.438.72.303.2]
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Applied Mechanics and Materials Vol. 776 293

References

[1] Brusly Solomon, K. Ramachandran (2012). Thermal performance of a heat pipe with nanoparticles coated wick, Applied Thermal Engineering, Vol. 36 10 6e11 2.

[2] A. J. R. R. Kempers, D. Ewing, C.Y. Ching. (2008) "Characterization of evaporator and condenser thermal resistances of a screen mesh wicked heat pipe," International Journal of Heat and Mass Transfer, Vol. 51, 6039-6046.

[3] Brian Holley, Amir Faghri (2006). Permeability and effective pore radius measurements for heat pipe and fuel cell applications. Applied Thermal Engineering 26 448–462.

[4] D. Deng, D. Liang, Y. Tang, J. Peng, X. Han, and M. Pan. (2013) "Evaluation of capillary performance of sintered porous wicks for loop heat pipe," Experimental Thermal and Fluid Science.

[5] D.K. Mishra, T.T. Saravanan, G.P. Khanra, S. Girikumar, S.C. Sharma, K. Sreekumar, P.P. Sinha (2010). Studies on the processing of nickel base porous wicks for capillary pumped loop for thermal management of spacecrafts, Advanced Powder Technology, Vol.21 658–662.

[6] J. A. Weibel, S. V. Garimella, and M. T. North, (2010) "Characterization of evaporation and boiling from sintered powder wicks fed by capillary action," International Journal of Heat and Mass Transfer, Vol. 53, 4204-4215,.

[7] J. R. Harris, (2008) "Modeling, Designing, Fabricating, and Testing of Channel Panel Flat Plate Heat Pipes," Logan, Masters Thesis.

[8] K.C. Leong And C.Y. Liu, (1997) Characterization of Sintered Copper Wicks Used in Heat Pipes, Journal of Porous Materials Vol. 4, 303–308.

[9] Mudawar. (2001) "Assessment of high-heat-flux thermal management schemes," Components and Packaging Technologies, IEEE Transactions on, Vol. 24, 122-141.

[10] Marcelo Lago, Mariela Araujo (2001). Capillary rises in porous media. Physica A 289 1– 17.

[11] N. Putra, W. N. Septiadi, and R. Irwansyah, (2013) "Effect of Concentration and Loading Fluid of Nanofluids on the Thermal Resistance of Sintered Powder Wick Heat Pipe," Anvanced Material Research.

[12] N. Thuchayapong, A. Nakano, P. Sakulchangsatjatai, and P. Terdtoon, (2012) "Effect of capillary pressure on performance of a heat pipe: Numerical approach with FEM," Applied Thermal Engineering, Vol. 32, pp. 93-99.

[13] Reiyu Chein, Guanming Huang. (2004) Thermoelectric cooler application in electronic cooling, Applied Thermal Engineering, Vol. 24, 2207–2217.

[14] Justin A. Weibel, Suresh V. Garimella (2012). Visualization of vapor formation regimes during capillary-fed boiling in sintered-powder heat pipe wicks. International Journal of Heat and Mass Transfer, Vol.55 3498–3510.

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Boiling Phenomenon of

Tabulate Biomaterial Wick Heat

Pipe

by

Wayan Nata Septiadi

FILE

T IME SUBMIT T ED 10- JUL- 2015 06:12AM

SUBMISSION ID 554907040

WORD COUNT 2046

CHARACT ER COUNT 10750

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9

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SIMILARIT Y INDEX

1

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INT ERNET SOURCES

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PUBLICAT IONS

0

%

ST UDENT PAPERS

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%

2

1

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3

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Boiling Phenomenon of Tabulate Biomaterial Wick Heat

Pipe

ORIGINALITY REPORT

PRIMARY SOURCES

Putra, Nandy, Wayan Nata Septiadi, Rosari

Saleh, Rardi Artono Koestoer, and Suhendro

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Nanofluid and Biomaterial Wick on Loop

Heat Pipe Performance", Advanced Materials

Research, 2014.

Publicat ion

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on Mobile Devices", Applied Mechanics and

Materials, 2015.

Publicat ion

Putra, Nandy, Rosari Saleh, Wayan Nata

Septiadi, Ashar Okta, and Zein Hamid.

"Thermal performance of biomaterial wick

loop heat pipes with water-base Al2O3

nanofluids", International Journal of Thermal

Sciences, 2014.

Publicat ion

Putra, Nandy, Wayan Nata Septiadi, Ranggi

Sahmura, and Cahya Tri Anggara.

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5

1

%

6

1

%

7

1

%

8

<

1

%

9

<

1

%

10

<

1

%

Copper-Powder Vapor Chamber for

Electronic Cooling", Advanced Materials

Research, 2013.

Publicat ion

Uranus, Henri P.. "Computational Study on

Modeness of Silicon on Insulator Photonic

Wire with Water Cladding", Procedia

Engineering, 2012.

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Ranggi Sahmura. "Analysis of CuO-Water

Nanofluid Application on Heat Pipe", Applied

Mechanics and Materials, 2014.

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www.waset.org

Int ernet Source

"High-Heat-Flux Distributed Capillary Artery

Evaporators", Handbook of Porous Media

Third Edition, 2015.

Publicat ion

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11

<

1

%

EXCLUDE QUOT ES OFF

EXCLUDE BIBLIOGRAPHY

ON

EXCLUDE MAT CHES OFF

Electronic and Photonic Packaging Electrical

Systems Design and Photonics and

Nanotechnology, 2005.

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Li, J.. "Experimental study on capillary

pumping performance of porous wicks for

loop heat pipe", Experimental Thermal and

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Gambar

Fig. 2  from circulating thermostatic batch (CTB). Testing was done by comparing the bubbles are formed medium tabulate biomaterials
Fig 4. The comparation of calor flux and the different temperature between heater without and with wick biomaterial

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