Berikut beberapa hasil iseng tersebut:
Thursday, January 12, 2012
Kaos dan waktu luang...
Banyak hal yang orang lakukan untuk mengisi waktu luang. Buat saya, waktu luang biasanya saya gunakan untuk bermain bersama anak (nonton, jalan-jalan), memotret (sebagian hasil2nya bisa dilihat melalui link di tombol navigasi sebelah kanan layar ini), keluyuran bersama anak-istri (silakan dilihat di link facebook saya), atau mendesain kaos. Sayangnya, hobi terakhir ini hanya sebatas iseng atau karena 'dimintai tolong', belum menjadi semacam rintisan bisnis. :) Tulisan ini saya muat dalam blog, supaya seandainya, sekali lagi seandainya ada seseorang yang berminat atau tertarik mengajak saya berbisnis distro kaos atau semacamnya, bisa segera colak-colek saya, hehehehe......
Berikut beberapa hasil iseng tersebut:
Berikut beberapa hasil iseng tersebut:
Monday, January 9, 2012
2012 Conference Papers
ESTIMATING THE ECONOMIC, ENERGY, AND ENVIRONMENTAL IMPACT OF EARTHWORK ACTIVITIES
Michael Phil Lewis, Apif Hajji
Presented in CRC Conference, Purdue University, West Lafayette, Indiana, USA - May 2012
Abstract:
Earthwork activities are a major part of many construction projects. They are typically performed by heavy-duty construction equipment that consumes large quantities of diesel fuel and results in large quantities of CO2 emissions. An estimating tool is needed to accurately assess the economic, energy, and environmental impact of earthwork activities that utilize heavy-duty diesel equipment. This paper presents the framework for a model that can be used to estimate the production rate, unit cost, activity duration, total activity cost, total fuel use, and total CO2 emissions for earthwork activities. Results indicate that there is little difference in the economic, energy, and environmental impact of sand dan gravel, sandy clay and loam, and common earth, but clay has substatially higher impact that other three soil types.
EVALUATION OF CONSTRUCTION EQUIPMENT FLEET PERFORMANCE THROUGH FUEL USE AND EMISSIONS INVENTORIES
Michael Phil Lewis, Apif Hajji
Presented in 9th Asia Pacific Transportation Development Conference & 25th ICTPA Annual Conference, Chongqing, China - July 2012
Abstract:
All types of construction vehicle fleets can benefit from fuel use and emissions inventory evaluation, including publicly-owned fleets that are used for infrastructure construction and maintenance. Fleet managers can use these types of inventories for minimizing the equipment’s contribution to air pollution and climate change. For example, identifying and correcting sources of excessive fuel use not only saves money for the fleet owner but also reduces the quantities of harmful pollutants and greenhouse gases that are emitted into the atmosphere. The purpose of this paper is to evaluate the current status of the construction equipment fleet for the City of Stillwater, Oklahoma by developing and analyzing a fuel use and emissions inventory. This inventory will be used as a decision support tool to maximize the environmental benefits of their equipment objectives. This study will seek to answer the following set of research questions: 1) What is the composition of the current fleet? 2) What is the fuel use and emissions inventory for the current fleet? 3) What fuel use and emissions reduction strategies should be considered? 4) What impact would “right-sizing” the equipment fleet have on fuel use and emissions? It is anticipated that this paper can serve as a case study that can be used by managers of publicly-owned fleets to address their specific concerns related to energy consumption and emissions.
THE DEVELOPMENT AND USE OF EMISSION-BASED INVENTORY FOR CONSTRUCTION EQUIPMENT
(case study: Backhoes Fleet in the City of Stillwater, Oklahoma, USA)
Apif Hajji, Michael Phil Lewis
Presented in 10th International Congress on Advances in Civil Engineering, Ankara, Turkey - October 2012
Abstract:
All vehicles produce pollutant gases that affect the quality of the air. Vehicles in construction industry are typically powered by diesel engines and are considered to be an off-road source of air pollution. Such vehicles are typically transported between sites on a highway via a trailer. Air pollutant emissions from vehicles powered by diesel engines include nitrogen oxides (NOx), particulate matter (PM), hydrocarbons (HC), and carbon monoxide (CO). Any engine that combusts a nonrenewable carbonaceous fuel will have net emissions of carbon dioxide (CO2). United States Environmental Protection Agency (EPA) estimates that there are approximately 2 million items of construction equipment in the United States (EPA, 2007). It is imperative to reduce pollution from this source to provide healthier environment for construction employees and the public and to reduce overall environmental impact. By reducing pollution, equipment owners are also able to save fuel and money. The purpose of this paper is to: (1) make an emission-based fleet inventory and list the quantities of pollutants emitted for the City of Stillwater, and (2) identify various strategies for the city of Stillwater to reduce emissions from off-road construction vehicles and technologies that the city can employ in the near future.
TOWARD DEVELOPMENT OF PRODUCTION-BASED AND COST-BASED GREENHOUSE GAS EMISSION MODEL AND ESTIMATOR FOR EARTHWORK CONSTRUCTION ACTIVITIES
Apif Hajji, Michael Phil Lewis
Presented in Urban Environmental Pollution, Amsterdam, the Netherlands - June 2012
Abstract:
The construction sector produced 6% of total US industrial GHG emissions. The purpose of this paper is to develop an innovative methodology and user friendly emission estimator, particularly for GHG emission or CO2 released from earthwork construction activity. The estimator will be demonstrated to two types of earthwork activity: bulk excavating with dozer and bulk excavating with scrapers. The estimator will include the production rate of activity, the unit cost of the activity, and CO2 emission rate of the activity, and modeled by using multiple regression analysis method. Information regarding the production rate and unit cost can be found in RS Means Heavy Construction Data 2011; CO2 emission rate can be obtained from the EPA’s Inventory of US Green House Gas Emission. Production-based emission model for CO2 can help construction professionals, an estimator in particular, to forecast the emission footprint of a project based on a quantity takeoff using construction plans and specifications. At the same time, it can help the construction estimator to assign dollar value to construction emissions
SENSITIVITY ANALYSIS AND PRODUCTIVITY STUDY OF DIRECTPIPE TECHNOLOGY BY USING SIMULATION
Apif Hajji
Presented in 2nd International Conference on Rehabilitation and Maintenance in Civil Eng., Sebelas Maret University, Surakarta, Indonesia - March 2012
Abstract:
Many techniques of trenchless technologies have been evolved over time to install, maintain, and manage underground infrastructure system, but all of these fail to satisfy implementer due to complex implementation process, economy, and adaptability to different geological conditions. Directpipe technology is one of new technology that has been invented by German’s Herrenknecht Inc. recently. It claims that the technology is economical, fast, and has a single step installation procedure. The objective of this paper is to analyze and evaluate that claim by using CYCLONE model simulation. The simulation is used to compare the Directpipe technology with traditional trenchless technology by incorporating real costs and duration into the model. Sensitivity analysis is carried out to find out a suitable combination of resources delivering utmost productivity.
Michael Phil Lewis, Apif Hajji
Presented in CRC Conference, Purdue University, West Lafayette, Indiana, USA - May 2012
Abstract:
Earthwork activities are a major part of many construction projects. They are typically performed by heavy-duty construction equipment that consumes large quantities of diesel fuel and results in large quantities of CO2 emissions. An estimating tool is needed to accurately assess the economic, energy, and environmental impact of earthwork activities that utilize heavy-duty diesel equipment. This paper presents the framework for a model that can be used to estimate the production rate, unit cost, activity duration, total activity cost, total fuel use, and total CO2 emissions for earthwork activities. Results indicate that there is little difference in the economic, energy, and environmental impact of sand dan gravel, sandy clay and loam, and common earth, but clay has substatially higher impact that other three soil types.
EVALUATION OF CONSTRUCTION EQUIPMENT FLEET PERFORMANCE THROUGH FUEL USE AND EMISSIONS INVENTORIES
Michael Phil Lewis, Apif Hajji
Presented in 9th Asia Pacific Transportation Development Conference & 25th ICTPA Annual Conference, Chongqing, China - July 2012
Abstract:
All types of construction vehicle fleets can benefit from fuel use and emissions inventory evaluation, including publicly-owned fleets that are used for infrastructure construction and maintenance. Fleet managers can use these types of inventories for minimizing the equipment’s contribution to air pollution and climate change. For example, identifying and correcting sources of excessive fuel use not only saves money for the fleet owner but also reduces the quantities of harmful pollutants and greenhouse gases that are emitted into the atmosphere. The purpose of this paper is to evaluate the current status of the construction equipment fleet for the City of Stillwater, Oklahoma by developing and analyzing a fuel use and emissions inventory. This inventory will be used as a decision support tool to maximize the environmental benefits of their equipment objectives. This study will seek to answer the following set of research questions: 1) What is the composition of the current fleet? 2) What is the fuel use and emissions inventory for the current fleet? 3) What fuel use and emissions reduction strategies should be considered? 4) What impact would “right-sizing” the equipment fleet have on fuel use and emissions? It is anticipated that this paper can serve as a case study that can be used by managers of publicly-owned fleets to address their specific concerns related to energy consumption and emissions.
THE DEVELOPMENT AND USE OF EMISSION-BASED INVENTORY FOR CONSTRUCTION EQUIPMENT
(case study: Backhoes Fleet in the City of Stillwater, Oklahoma, USA)
Apif Hajji, Michael Phil Lewis
Presented in 10th International Congress on Advances in Civil Engineering, Ankara, Turkey - October 2012
Abstract:
All vehicles produce pollutant gases that affect the quality of the air. Vehicles in construction industry are typically powered by diesel engines and are considered to be an off-road source of air pollution. Such vehicles are typically transported between sites on a highway via a trailer. Air pollutant emissions from vehicles powered by diesel engines include nitrogen oxides (NOx), particulate matter (PM), hydrocarbons (HC), and carbon monoxide (CO). Any engine that combusts a nonrenewable carbonaceous fuel will have net emissions of carbon dioxide (CO2). United States Environmental Protection Agency (EPA) estimates that there are approximately 2 million items of construction equipment in the United States (EPA, 2007). It is imperative to reduce pollution from this source to provide healthier environment for construction employees and the public and to reduce overall environmental impact. By reducing pollution, equipment owners are also able to save fuel and money. The purpose of this paper is to: (1) make an emission-based fleet inventory and list the quantities of pollutants emitted for the City of Stillwater, and (2) identify various strategies for the city of Stillwater to reduce emissions from off-road construction vehicles and technologies that the city can employ in the near future.
TOWARD DEVELOPMENT OF PRODUCTION-BASED AND COST-BASED GREENHOUSE GAS EMISSION MODEL AND ESTIMATOR FOR EARTHWORK CONSTRUCTION ACTIVITIES
Apif Hajji, Michael Phil Lewis
Presented in Urban Environmental Pollution, Amsterdam, the Netherlands - June 2012
Abstract:
The construction sector produced 6% of total US industrial GHG emissions. The purpose of this paper is to develop an innovative methodology and user friendly emission estimator, particularly for GHG emission or CO2 released from earthwork construction activity. The estimator will be demonstrated to two types of earthwork activity: bulk excavating with dozer and bulk excavating with scrapers. The estimator will include the production rate of activity, the unit cost of the activity, and CO2 emission rate of the activity, and modeled by using multiple regression analysis method. Information regarding the production rate and unit cost can be found in RS Means Heavy Construction Data 2011; CO2 emission rate can be obtained from the EPA’s Inventory of US Green House Gas Emission. Production-based emission model for CO2 can help construction professionals, an estimator in particular, to forecast the emission footprint of a project based on a quantity takeoff using construction plans and specifications. At the same time, it can help the construction estimator to assign dollar value to construction emissions
SENSITIVITY ANALYSIS AND PRODUCTIVITY STUDY OF DIRECTPIPE TECHNOLOGY BY USING SIMULATION
Apif Hajji
Presented in 2nd International Conference on Rehabilitation and Maintenance in Civil Eng., Sebelas Maret University, Surakarta, Indonesia - March 2012
Abstract:
Many techniques of trenchless technologies have been evolved over time to install, maintain, and manage underground infrastructure system, but all of these fail to satisfy implementer due to complex implementation process, economy, and adaptability to different geological conditions. Directpipe technology is one of new technology that has been invented by German’s Herrenknecht Inc. recently. It claims that the technology is economical, fast, and has a single step installation procedure. The objective of this paper is to analyze and evaluate that claim by using CYCLONE model simulation. The simulation is used to compare the Directpipe technology with traditional trenchless technology by incorporating real costs and duration into the model. Sensitivity analysis is carried out to find out a suitable combination of resources delivering utmost productivity.
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