cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2008.1770
title: Natural rubber reinforced by in situ silica generated in rubber solution by sol-gel process

description: In this study, the synthesis of in situ silica filled in natural rubber (NR) solution was investigated to find the optimum that produced high in situ silica content and good dispersion of silica particle. The effects of solvent, type of catalyst, catalyst concentration, mole ratio of tetraethoxysilane (TEOS) to water, reaction temperature and reaction time on in situ silica formation were investigated. The results indicated that the optimum condition produced high silica content (up to 41% by weight) in rubbery matrix obtained from the use of 0.1395 M n-hexylamine as the catalyst in tetrahydrofuran and the mole ratio of TEOS to water 1:2.7 under 50 oC for 7 days. Various properties, i.e., curing, mechanical, dynamic mechanical and thermal properties of composite materials were also investigated. The results indicated that the increasing in situ silica content affected to increase the cure time and improve the tensile properties of the composite. In comparison with commercial silica and calcium carbonate, the mechanical properties of the in situ silica composite material was better; however, it was still lower than mechanical properties of carbon black composite. The addition of coupling agent also improved the mechanical properties of the in situ silica composite. The pseudo-network structure of in situ silica was low, which resulted in a low storage modulus. By filling in situ silica in NR, thermal properties of composite material were also improved. These unique characteristics of the in situ silica composite can be ascribed to the well dispersed in situ silica particles within the NR matrix.
DOI: 10.14457/cu.the.2008.1771
title: Nitrogen treatment in closed-system tilapia cultivation using submerged nitrifying biofilter

description: This work focused on a development of simple yet effective aquaculture systems for an adoption among budget-limited Thai farmers. The first part of the work investigated the parameters that influenced an acclimation of nitrifying biofilters while the second part tested for the performance of the proposed aquaculture systems integrated with acclimated nitrifying biofilters at different initial aquaculture densities. Shrimp diet addition was able to establish nitrification on Biocord[superscript TM] biofilters within a period of 3-4 weeks. An initial nitrifying rate of Biocord[superscript TM] biofilters after acclimating period was determined at 24.1 mg N m[superscript -2] day[superscript -1]. The zero-water exchanged tilapia cultivation was carried out in the proposed aquaculture systems integrated with shrimp diet acclimated Biocord[superscript TM] biofilters. Design of the proposed system combined aquaculture production, water treatment, and solid-liquid separation within single tank, thereby offering a possibility of process simplification and reduction in operational costs. Series of experiments indicated that the proposed aquaculture systems were capable of maintaining ammonium and nitrite concentrations below 1.0 mg N L[superscript -1] despite increasing inorganic nitrogen loadings more than 30-folds from 5-18.3 mg N L[superscript -1] despite increasing inorganic nitrogen loadings more than 3-folds from 5-18.3 mg N L[superscript -1] day[superscript -1]. Efficient performance of the systems was linked to a proper biofilter preparation to achieve fully nitrification before an initial deployment was taken placed as well as microbial immobilization that successfully retain slow-growth nitrifying facteria in the systems. Besides nitrification, direct assimilation of inorganic nitrogen and heterotrophic denitrification were other mechanisms responsible for inorganic nitrogen control. Teh excellent capability of the chosen Biocord[superscript TM] biofilters in retaining suspended solids was crucial for the onset of heterotrophic denitrification. Frequent suspended solid removal from Biocord[superscript TM] biofilters was able to reduce the likelihood of heterotrophic denitrification and sulfate reduction, which produced toxic H₂S. Regular cleaning of Biocord[superscript TM] biofilters also enhanced nitrifying rates in comparison to unclean biofilters. With biofilter cleaning (i.e., once every 2 weeks), the proposed aquaculture systems were able to increase their harvesting density to as high as 25-30 kg m[superscript -3], which is comparable to unenvironmental-friendly caged production. In this work, nitrification rates obtained (i.e., 27.6-41.2 mg N m[superscript -2] day[superscript -1]) were in the low-range compared to other works. In spite of that, the proposed aquaculture systems should remain attractive for Thai farmers due to their design simplicity.
DOI: 10.14457/cu.the.2008.1772
title: A Multi-item multi-depot inventory routing problem

description: This thesis studies a multi-retailer multi-depot distribution system with multi-item. In this system, the products must be spread from a group of depot to several retailers in a finite time horizon. Shipments from the depots to retailers are made by a set of homogeneous vehicle with limited carrying capacity. Customer demand of items at each retailer is dynamic with time period. Decisions in this system include replenishment quantities of each item at each retailer during considered periods and its corresponding delivery route with minimum total inventory and routing cost during considered time horizon. For the solution, this dissertation uses the concept of problem decomposition by decomposing the main problem into many sub problems. Each sub problem is the lot-sizing problem for an item in an outlet or a set of items in outlets. The lot-sizing problem considered in this dissertation differs from the basic lot-sizing problem in which the setup cost is dynamic. The setup costs are provided by the calculation of the difference on route cost. Three heuristic algorithms, SIOH, AIOOH and AIOVH, are proposed to solve this complicated problem. The performances of the heuristics are tested by comparing to solution obtained by CPLEX 8.0 for small-sized problem and Lot-for-Lot policy for medium and large-sized problem. The computational results show that the proposed heuristics can achieve the optimal solution in small-sized problem. Moreover the heuristics AIOOH and AIOVH show improvement from Lot-for-Lot policy between 15-25% in average for the medium and large-sized problem.
DOI: 10.14457/cu.the.2008.1773
title: A Multi-level multi-item capacitated lot sizing problem (MLCLSP) model

description: This research was motivated by problems arising from manufacturing of end product from various raw materials. The firm also needs to take into account of other factors, for example: workstation capacity changes over time period; warehouse capacity; raw materials are affected by either availability or price and etc. The purchasing and production planning in multi-item multi-period multi-workstation capacitated lot size situation is discussed and formulated as a Mixed Integer Programming model (MIP) and can be called as a Multi-item Multi-level capacitated lot size with multi-workstation problem (MLCLSP-M). With too complexity of the solving large problem, three heuristic methods are developed, tested and compared based on standard library, illustrating the solution quality and computational time. The proposed heuristics are Assignment-Lot size heuristic (A-LS), Partial Assignment – Lot size (PA-LS), and Max Cover Period – Lot size (MCP-LS). These methods are based on the decomposition of the MLCLSP-M into two phases consisting of an assignment with given lot size phase and a lot size with given assignment phase. Each iteration, the sub problem mathematical models are solved with AMPL/CPLEX 8.0.0 solver. Computational test results are analyzed and discussed on performance and running time. On comparing with the original mathematical model solving, the results indicate that the A-LS heuristic gives a satisfactory solution with very fast solving time, the PA-LS heuristic gives a closely optimal solution with very long solving time, and the MCP-LS gives a good solution with medium solving time.
DOI: 10.14457/cu.the.2008.1774
title: A study of produced water disposal into aquifer by black oil reservoir simulator

description: Produced water (PW) is one of the byproducts from gas and gas-condensate production in many gas fields in the Gulf of Thailand. One method to dispose the PW is to inject into shallow aquifer through injection wells. The advantages of this method are high disposal capacity, potential harmful fluids are permanently removed from direct human and indirect food chain, interaction and to prevent generation of byproducts from the treatment process. In this study, the most suitable formations sand units A and B in M field in the Gulf of Thailand was selected. The reasons are high porosity, permeability and reservoir volume. Two wells were used to inject the PW into shallow aquifers, located above the producing formation. In this study, a 3D reservoir simulator ECLIPSE 100 is used to perform reservoir model construction and performance prediction. The reservoir simulation models of targeted sand units were constructed based on structural map, well logging data and special core analysis data. Initial reservoir conditions and fluid properties were input to complete the models. After initializing the homogeneous model (HM), Channel-I and Channel-II models were generated to introduce heterogeneity. Under the three models a number of simulation cases were run at different initial well injection rates with single and both well injection options in order to investigate injection capacity and performance. The impact of different well injection rates on injection capacity and performances were investigated. In addition, under intermittent injection the gain of injection performance (IP) was also investigated. Finally, the best sand candidate in terms of maximum cumulative injection volume was recommended.
DOI: 10.14457/cu.the.2008.1775
title: Alumina doped alginate gel as cell carrier in ethanol fermentation process

description: Alumina (Al₂O₃) doped alginate gel (AEC) was developed as a new type of cell carrier ethanol fermentation using flocculating yeast strain Saccharomyces cerevisiae M30. Sugar cane molasses was used as a carbon and energy source for fermentation medium at the initaial sugar concentration of 220 g/l. The performance of AEC carrier in ethanol fermentation was evaluated and compared to the conventional Ca-alginate bead (EC) and suspended cell (SC) in shaking flask at 10 rpm and 33℃, for 72 hours. The AEC arrier was sound to be more effective for yeast immobilization resulting in higher ethanol production, better porous struture and better mechanical properties in terms of tensile strength and percentage of elongation at break than the EC carrier. The addition of Al₂O₃ particle in the carrier could support cell activities and construct the network of cell and Al₂O₃ inside the gel bead. This network was able to create microporous structure that could improve mass transportation. To increase the efficiency of AEC carrier, the effets of bead diameter size, Na-alginate concentration and Al₂O₃ concentration on the ethanol fermentaton were investigated. The final ethanol concentraton was almost constant at 88-92 g/l under the range of 2-6 mm bead diameter. The maximum ethanol concentration was obtained when 2.5% (w/v) of Na-alginate and 5.0% (w/v of alginate) of Al₂O₃ were applied. Furthermor, the ethanol fermentation potential of the system applied with the convenient form of square sja[e AEC carroer )20 x 20 x 4 x mm³ ) was promising with its ethanol concentration comparable to that of the system of spherical shape ( 6 mm) AEC carrier. The continuous ethanol fermentation in packed bed reactor using the square shape AEC carrier worked efficiently and was stable over a period of 30 days. The maximum ethanol productivity of 12.34 g/l' or about 9 times of that of the batch system was achieved at the dilution rate of 0.28 h-1 Therefore, the AEC carrier was suitable for cell immobilization in ethanol fermentation process and successfully applied in packed bed reactor. The developed carrier had many advantages including high ethanol production, good mehanical property, stability and high immobilization yield.
DOI: 10.14469/hpc/6037
title: C18 CCSD/6-31G(d) SCF=11 Kekule mode = -4564 cm-1

description: Gaussian Calculation
DOI: 10.17632/mpjrkg34jw.1
title: hardRain: an R package for quick, automated rainfall detection in ecoacoustic datasets using a threshold-based approach.

description: Ecoacoustic data files collected with automated recording units
DOI: 10.21227/8xhs-dv13
title: Comparison Wind turbine

description: Inconvenience regretted, please visit page in september/october.Dont want to cancel account,as do have something to upload but busy in some other problem.The results are concluded but for some reason,complete project is under re-experimentation from my side.This dataset is a series of experiments, which contain simulation results,comparisons ,animated phase portraits. This dataset is original,not plagiarised data generated using examples available on net or in demo but rather results have been generated for a project which will be onsite implemented for domestic/residential and to studyWe have a varying wind speed. There is fault on line
DOI: 10.7910/dvn/1csvbv/ai78ji
title: stringCore.py

description: helper functions
DOI: 10.14457/cu.the.2008.1776
title: An exploration of Cambodian construction industry : a case study of contractors' problems

description: Construction industry which plays a critical role in the development of the Cambodian economic is one of the most important industrial sectors. Cambodia is a developing country where the construction sector has just boosted in last decades. The contractors are the important organizations which have direct role in construction industry. By the preliminary survey, most contractors in Cambodia, including the local and foreign firms have faced a lot of problems in their construction projects. The main objectives of this research are to study contractors’ problems in Cambodia and compare with contractors’ problems in Thailand for determining the similar and different problems that were encountered the contractors in both countries. Surveys and interviews were conducted on major construction projects in Cambodia to explore the most significant problems causing construction problems. Factors related to owners, government, consultants, subcontractors, labors, engineers, material suppliers, and marketing were investigated. Contractors’ problems in Cambodia were categorized under 2 different levels, industry level and project level. Moreover, the literature review, questionnaires and interviews were conducted in order to survey contractors’ problems in Cambodia and then compare those in Thailand. The result of the study presented 55 contractors’ problems encountered in Cambodia in which 30 problems were industry level and 25 problems were project level. Furthermore, the result of comparisons showed the similar and different problems in both industry level and project level. At industry level, the main categories of differences were problems of construction regulations, problems by government, materials and machines, human resources and construction marketing, whereas, the main categories of similarities were mostly problems of financial, coordination and communication. In addition, at project level, the main category of different problems was found in the material resources. However, the main categories of similarities were found in many categories such as problems by owners, consultants, subcontractors, human resources and communication.
DOI: 10.14457/cu.the.2008.1777
title: An integration of risk assessment and random-fuzzy network scheduling for complex construction operations

description: The uncertainty may be broadly classified into aleatory and epistemic uncertainty. A large or complex construction project is not only fraught with the aleatory uncertainties, but also influenced by risk factors, such as adverse weather condition, unavailable quantities of materials, operator experience, and poor performance of machines. These risk factors contribute to stochastic phenomenon. Insufficient data or lack of site productivity data compound aleatory uncertainty in the risk assessment and project scheduling by leading to imprecise, vague, and subjective data causing epistemic uncertainty. Although distributions of risk variables and temporal variable are propagated through a simulation model by introducing randomness into the analysis of construction processes, the establishment of probabilistic distributions of random variables is generally provided without a consideration about the epistemic uncertainty. Inaccurate probability distribution can bring about misleading outputs. This study attempts to provide an accurate duration estimate by examining these two types of uncertainty. A risk assessment integrated within random – fuzzy network scheduling method (RAIRFNET) is developed for modeling uncertainties associated with risk assessment and construction scheduling and estimating activity duration and project completion time. The proposed method uses historical data, subjective data from professional experience and judgment, and simulation data to produce information associated with risk affecting activity duration. Risk variables and temporal variable are considered as a random – fuzzy variable and represented by different shapes of membership functions (i.e., nil, rectangular, trapezoidal). The membership function is developed by inserting the internal membership function representing the fuzzy effect into the external membership function representing the random effect which is transformed from the corresponding probability distribution by using the Salicone's method and neurofuzzy metamodel. Mathematics for random-fuzzy variables are used in the network calculation to propagate each type of uncertainty. The proposed method provides results that cover actual duration. The results can reflect reality of a construction project by addressing every uncertainty. The estimated duration varies based on the assigned value of epistemic uncertainty and dependencies between the considered risk factors. An application of nil internal membership functions provides results close to the simulation results as both of them determine only uncertainty due to the random contribution, but these two methods cannot provide results covering the actual duration.
DOI: 10.14457/cu.the.2008.1778
title: Analysis of factors affecting costs of pavement in-place recycling

description: All of pavement rehabilitation projects with pavement in-place recycing of DOH & DOR will be operated by employing contractors. The total cost for employing can be calculated from the standard estimaton of road. Since DOH&DOR use a formula that comes from many factors and variables for estimating direct costs of pavement in-lace recycling, it has a problem that what different between total cost estimation of DOH & DOR, and total cost estmation of the contractor is. The objectives of this research are to analyze factors and variables affecting total cost of pavement in-place recycling of DOH & DOR and to analyze factors and variables affecting costs & profit of pavement in-place recycling of the contractor. The study aims to find some guidelines for improving total cost estimation of DOH & DOR. From analysis of total cost structure, we find that total cost of DOH & DOR can be divided into direct costs and operation costs that consist of 22 costs. The total cost of the contractor can be divided into direct costs and indirect costs that consist of 26 costs. By identifying costs in total cost of DOH & DOR, and costs in total cost of the contractor into group of costs that consists of materials costs, labor and machine costs, operation costs, profit, and TAX, it can find that the labor and machine costs of DOH & DOR is higher than the contractor. The cost that are significantly caused of difference are investment cost, maintenance costs and depreciation. The difference in defining factors such as type, number, prices, and salvage value of machines is the major factors affecting these costs. From the analysis of factors affecting costs of pavement in-place recycling, we can find some guidelines for improving total cost estimation of DOH & DOR in 3 ways that comprise of 1) Materials costs estimation improvement by using percentage of cement from field test instead of using from the tables. 2) Labor and machine costs estimation improvement by using update new machine prices from sale agencies for calculating investment cost, maintenance cost and depreciation cost. In addition, the cement truck and water truck may be not included in total cost estimation. 3) Operation costs estimation improvement by using Factor F in case normal rain for project that is operated out of rainy season even though this area is located in rainy area.
DOI: 10.14457/cu.the.2008.1779
title: Application of multichannel analysis of surface wave to shallow site investigation for subsoil in Thailand

description: The multichannel analysis of surface wave method (MASWM) is a nondestructive test recently developed for subsoil characterization. By conducting the test on ground surface, the shear wave velocity which is a necessary parameter for dynamic analysis, can be easily attained. In this study, the tests have conducted at seven sites in Thailand along with the seismic downhole test, searching for the validity and proper inversion algorithm as well as the best practice for testing. The process consists of three sequences which are the field data collection, the transformation by the Two Dimensional Fast Fourier Transform (2D FFT), and the inversion to shear wave velocity profile. Afterward, the obtained shear wave velocity profiles are investigated by comparing with the predictions by other methods; namely those from seismic downhole tests, boring reports, and Seismic Cone Penetration Test (SCPT). It is found that the λ/3 inversion algorithm offers the predictions that are consistent with other methods. Therefore, it is concluded that MASWM is also a valid choice for subsoil exploration in Thailand. For the test configuration, it is recommended that the distance between the seismic source to the first geophone should be around 25 to 30% of the spread length. When using the same equipment and configuration, the investigation depth is limited to 20m. In addition, the sophisticated inversions are recommended for future research.