Prasartkaew B.,Pathumthani University |
Kumar S.,Asian Institute of Technology
Renewable Energy | Year: 2013
Renewable energy based technologies can be introduced for building cooling applications. Most studies on solar absorption cooling use fossil energy based auxiliary heaters. This paper presents experimental studies of a solar-biomass hybrid air conditioning system. The system performances at quasi-steady state conditions were analyzed. The results demonstrate that the system operates at about 75% of nominal capacity at an average overall system coefficient of performance of about 0.11. Performances of individual components of the system were also evaluated. The experimental results compared with results from other studies shows that the proposed system's performance in terms of chiller and overall system coefficient of performance is superior. © 2013 Elsevier Ltd.
Traitanon O.,Pathumthani University |
Poggio E.D.,Cleveland Clinic |
Fairchild R.L.,Cleveland Clinic |
Fairchild R.L.,Case Western Reserve University
Current Opinion in Nephrology and Hypertension | Year: 2014
Purpose of review Rapid progress in molecular technology has allowed development of numerous molecular tools to help the clinician to evaluate graft status in kidney transplant patients. This review highlights recent findings, describing the use of molecular approaches to monitor, diagnose, and predict alloimmune-mediated injury in kidney grafts. Recent findings Both previously identified and newly discovered molecular markers of immune injury have been studied and validated in large multicenter studies. Recent data indicate that measuring specific gene transcripts in noninvasive samples, such as urine or peripheral blood, can identify the occurrence of acute rejection and differentiate this immune-mediated injury from other causes of graft dysfunction. Serial monitoring of urine in stable renal transplant patients may detect the onset of rejection before development of graft dysfunction. Moreover, combining gene expression analysis with conventional histopathologic assessment of grafts can enhance the accuracy of diagnosis and may also help predict graft outcomes. Summary Measuring specific gene transcription in noninvasive clinical samples has the potential to become an important and standard tool to monitor alloimmune-mediated injury in kidney transplant recipients. Prospective studies are ongoing to validate these findings for use of these approaches in clinical settings. © 2014 Wolters Kluwer Health-Lippincott Williams & Wilkins.
Traitanon O.,Northwestern University |
Traitanon O.,Pathumthani University |
Gallon L.,Northwestern University
Nephron | Year: 2015
Chimerism is a state in which bone marrow hematopoietic stem cells from two genetically different animals coexist. To date, the approach has been used successfully to induce the state of immunologic tolerance in the animal models and is now being evaluated in clinical trials of both HLA-identical and HLA-mismatched living-donor kidney transplant recipients in some transplant centers with varying degrees of success. Although the results are promising, the current conditioning regimens are not optimal and longer-term follow up and multicenter studies are needed to ensure the efficacy and safety of the procedures. © 2014 S. Karger AG, Basel.
Ananviriyaporn S.,Pathumthani University
Journal of the Medical Association of Thailand = Chotmaihet thangphaet | Year: 2012
Endodontically treated teeth often have a varying remaining coronal tooth structure, is an important factor in the successful of post-core with crown restoration. This study compared the fracture resistance of pulpless teeth with variable amounts of remaining coronal tooth structure restored with fiber-reinforced composite posts and composite core. Fifty extracted human premolars were endodontically treated and divided into 5 groups of 10 teeth each. Four groups were prepared having axial wall heights of 4 mm around the preparation circumferences. In 3 of the groups with axial tooth structure, mesial axial tooth structure was removed, mesial and lingual axial tooth structure were removed, mesial-lingual and distal axial tooth structure were removed. For the fifth group, all axial tooth structure was removed to the level of the prepared finish line. All 50 prepared teeth were restored with fiber-reinforced composite posts (FRC Postec Plus) and composite resin cores (Multicore Flow). Testing was conducted with a universal testing machine with the application of a static load to the lingual incline plane of buccal cusp at a crosshead speed of 5 mm/min at 45 degrees to the long axis of the tooth. The load at failure was recorded. The data were subjected to 1-way analysis of variance. The mean value + standard deviation for the failure load of group 1 to 5 were 237.48 +/- 81.87, 242.97 +/- 66.80, 257.67 +/- 70.42, 239.56 +/- 70.42 and 297.70 +/- 99.42 (N), respectively There were no significant differences in the fracture resistance (p < 0.01). No root fractures occurred in any of the groups. The varying remaining coronal tooth structure of endodontically treated tooth had no influenced on the fracture resistance when restored with fiber-reinforced composite posts and composite core.
Sookramoon K.,Pathumthani University
Advanced Materials Research | Year: 2014
This research presents the design, construct and performance evaluation of a 2-stage parabolic trough solar concentrator (2-stage PTC). The primary stage was constructed of polished stainless steel (SUS 400) to form the primary stage parabolic reflector (1.489 m ×1.489 m size), the second stage was constructed of multi - piece mirror to form the hyperbolic shape reflector (0.13 m×1.489 m). Black painted copper pipe in the size of inside diameters (27.2 mm) covered with glass tube was used as receiver. One - axis Sun tracking system has been installed to track 2-stage PTC according to the direction of beam propagation of solar radiation. By using water as a heat transfer fluid its capability to heat transfer and load high temperature (100°C). The storage tank is fabricated with stainless steel of size 40 L. The experimental tests have been carried out in Faculty of Industrial Technology, Vallaya Alongkorn Rajabhat University Pathum Thani, Thailand climatic conditions (14.134°N, 100.611°E) during 5 selected days of the months May 2013. The performance of a 2-stage PTC was evaluated using outdoor experimental measurements including the useful heat gain, the thermal instantaneous efficiency and the energy gained by the water. The experimental results shown the maximum thermal efficiency was 23.43%, the optical efficiency was 76%, and the total geometrical concentration was 27.08X. © (2014) Trans Tech Publications, Switzerland.
Prempraneerach P.,Pathumthani University
2014 International Computer Science and Engineering Conference, ICSEC 2014 | Year: 2014
In a design process of a Delta or parallel robot, link parameters and actuators size must be selected to maximize appropriate workspace and payload capability. To derive a workspace of the Delta robot, the Cartesian reachable position of the Delta-robot end effector can be efficiently identified using an inverse kinematics. By varying upper-arm and fore-arm lengths, a maximize workspace for a desired reachable work area could be obtained. Furthermore, a trajectory tracking of the Delta robot for pick-and-place operation can be analyzed in terms of load-carrying ability using simplified dynamic equations such that proper actuators and gears could be correctly chosen in the design phase before constructing the Delta robot. © 2014 IEEE.
Anantasate S.,Pathumthani University |
Bhasaputra P.,Pathumthani University
ECTI-CON 2011 - 8th Electrical Engineering/ Electronics, Computer, Telecommunications and Information Technology (ECTI) Association of Thailand - Conference 2011 | Year: 2011
This paper proposes a new application of bees algorithm (BA). In this application, the multi-objective bees algorithm (MOBA) is developed for solving the multi-objective optimal power flow (MOOPF) problems on small and large scale power system. The objectives of MOOPF are to minimize the total fuel cost of generation, environmental pollution and power system loss by considering many constraints i.e. limits on generator real and reactive power outputs, bus voltages, transformer tap-setting and power flow of transmission lines. Proposed crowded selection mechanism and fuzzy mechanism techniques are added into selection process of proposed MOBA. Also, the algorithm based on fuzzy set theory is used to extract the best compromise solution. In order to prove the proposed MOBA method, the simulation result of weight aggregation is used for comparison. The standard IEEE-30 and IEEE-118 bus system is selected to test the algorithm. The result shows that Pareto front of proposed MOBA are diverse and well distributed. The proposed MOBA have good performance and efficiency to solve multi-objective optimal power flow. © 2011 IEEE.
Sukchana T.,Pathumthani University |
Jaiboonma C.,Pathumthani University
Energy Procedia | Year: 2013
The effect of R-134a filling ratio and adiabatic length on thermal efficiency of the long heat pipe are investigated. An experimental heat pipe is fabricated from the straight copper tube having an inner diameter of 11.3 mm. The evaporator and condenser length are 100 mm. The R-134a used as the working fluids filled in the heat pipe was tested. Filling ratios of the working fluid to heat pipe volume at 10, 15 and 20% and input heat flux rates of 1.97 to 9.87 kW/m2 were carried out in order to determine the thermal efficiency and optimum condition. The inlet cooling water temperature was kept constant at 20°C. The adiabatic lengths of heat pipe for these experiments were 300, 500 and 700 mm (adiabatic length ratios 0.60, 0.71 and 0.77). The results show that the filling ratios have more significant effect on the thermal efficiency than adiabatic length. The optimum filling ratio of 15% and 5.92 kW/m2 of heat flux are found to be favorable at shorter adiabatic length. © 2013 The Authors. Published by Elsevier B.V.
Leeprechanon N.,Pathumthani University |
Polratanasak P.,Pathumthani University
ECTI-CON 2010 - The 2010 ECTI International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology | Year: 2010
This paper presents the solution of environmental/ economic dispatch (EED) problem by using a multiobjective bees algorithm (MBA) with clustering technique. EED problem is to minimize simultaneously the total fuel cost and environmental pollution of generation while satisfying various constrains. The MBA is modified from Bees Algorithm in order to solve EED problem through compromised fuzzy and clustering techniques. The IEEE 30 Bus system was selected for testing purpose. The results show that the proposed method has effectiveness and potential for solving EED problem.
Manochantr S.,Pathumthani University
Journal of the Medical Association of Thailand = Chotmaihet thangphaet | Year: 2011
Hep88 mAbs, a novel monoclonal antibodies against hepatocellular carcinoma cell line from Thai patient, has been proved earlier for its tumoricidal effect on HepG2 cell line. In the present study, we investigated not only Hep88 mAb's targeted proteins from HepG2 cell line by western blot analysis but also its inhibitory activity on those cells by MTT assay. Moreover the ultrastructural alteration induced by Hep88 mAb of HepG2 cell line compare with Chang liver cell line was also examined. The results demonstrated that Hep88 mAb had cytotoxic effect on HepG2 cell line but not Chang liver cell line. Additionally, recognizing proteins against Hep88 mAb have been found on both cell lines. The ultrastructural alteration detected from transmission electron microscopy included the appearing of intracellular vacuolization as well as the dilatation of endoplasmic reticulum and mitochondria have been observed. These findings are suggested that the death of HepG2 cell line after treatment with Hep88 mAb might be involved by an apoptosis-like program cell death (PCD) pathway. From all of these remarks, it is possible that Hep88 mAb can injure HCC cells by binding with its membrane-bound antigen and activated downstream intracellular signals which is finally leading cell to be death via apoptosis-like PCD.