Abstract: The work is focused on an attempt to develop a route for the fabrication of piezoceamic-polymer composites having (1-3) type connectivity. The process included the extrusion of rods of diameter approximately 200 mm. A commercial piezoelectric, PC-5 was modified by addition of a lithium/bismuth based glass former together with excess PbO to lower the sintering temperature to about 1000 °C. The fast firing sintering was employed. The rods were assembled and impregnated with an epoxy resin to form 1-3 composites containing approximately 50 and 20 vol% piezoceramic. The measurement values showed that, the piezoelectric constant, d33 = 232 pCN-1 and 215 pCN-1, thickness electromechanical coupling coefficient, kt = 0.51 and 0.5 and the mechanical quality factor, Qm = 14 and 5 for the composites containg PZT rods at 50 vol% and 20 vol% respectively. Their acoustic impedances were 5.1 and 3.6 for the 50 vol% and 20 vol% of PZT rods respectively. The results show that with lower volume% of PZT could result in lower acoustic impedance which can be further improved for biomedical imaging and hydrophone applications.
Abstract: Lead-free powders of Bi(Na0.81K0.19)O3 doped 0.3 wt.% CoO were prepared by a conventional mixed oxide technique. The sintering process was controlled with various rate up and down temperature. The samples were sintered at 1,050 °C for 4 h which difference heating rate controlled i.e. 100, 300, and 600 °C/h. The XRD pattern analysis of all studied samples showed a single phase perovskite structure Dielectric and ferroelectric properties of the ceramics were investigated as a function of rate controlled sintering temperature. The sample heating rate at 600 °C/h showed maximum dielectric constant (~5961) at Tm. In addition, the ferroelectric properties were analyzed and discussed.
Abstract: In this research, molybdenum trioxide (MoO3) nanoflakes were synthesized by a simple and low cost hydrothermal method for gas sensing application. Sodium molybdate (Na2MoO4·2H2O) was used as the precursor. The powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). After hydrothermal process, the powders were showed amorphous phase. However, after annealing process the MoO3 was observed as particles having the orthorhombic phase. The average particle sizes of MoO3 nanoflakes were about 80 nm. The morphologies, cross section and elemental compositions of sensing films were analyzed by SEM and EDS line-scan mode analysis. From the SEM image revealed nanoflakes morphologies of MoO3 and the thickness of MoO3 sensing film was about 10 mm. The obtained sensing film can be used as the sensing device to fabricate composited gas sensors for detection of some environmental hazardous gas (including ethanol, carbon monoxide, hydrogen sulfide, sulfur dioxide, nitrogen oxide, and ammonia) will report in the next research.
Abstract: This study was conducted to stabilize the correlation parameter for economic traits of local rice (Oryza sativa L.). The results revealed that the number of tiller (NT) was positively correlated with plant height (PH, r = 0.55211), number of panicle (NP, r = 0.48390), panicle length (PL, r = 0.31181), seed length (SL, r = 0.33430), total seed weight (TSW, r = 0.28122), however, the negatively correlated with seed width (SW, r = -0.26725). Plant height (PH) was negatively correlated with seed width (SW, r = -0.42971) and 100 seed weight (HS, r = -0.28991). Number of panicle (NP) was positively correlated with panicle length (PL, r = 0.32888) and total seed weight (TSW = 0.75128). Panicle length (PL) was positively correlated with number of seed (NS, r = 0.38332), seed length (SL, r = 0.53582) and total seed weight (TSW, r = 0.51078). Number of seed (NS) was positively correlated with total seed weight (TS, r = 0.54696). Seed length (SL) was positively correlated with 100 seed weight (HS, r = 0.46799) and total seed weight (TSW, r = 0.33826). Seed width (SW) was positively correlated with 100 seed weight (HS, r = 0.66074). In this experiment, multiple regression formula was Y(TSW) = -51.31 + 0.045(PH) + 2.77(NP) + 0.21(NS) + 8.88(HS) with R2 = 0.5644. Our results represent the relationship among traits and making for design a crop model in rice planting system.
Abstract: Transgenic differently over-expressed cDNA involving in flavonoid biosynthesis (FLAVONOL SYNTHASE: FLS and TRANSPARENT TESTA 8: TT8) and wild type plants were grown in the culturing room radiated with fluorescent light. Flowers of each transgenic and WT were collected and extracted with acidic methanol. The flower extracts were analyzed for the relative content of each flavonoid subgroup by spectrophotometry. The result showed that the both transgenic extracts contained flavanone and flavone higher than WT extract did. The FLS extract contained the highest amount of flavonol content (1.4 times) following with the TT8 extracts (1.25 times) comparing to WT extract. The TT8 extract has anthocyanin content approximately 3 times, while the FLS extract has only 0.5 times of WT. The extract was used to evaluate the antioxidant capacity by ABTS and DPPH methods. The result showed that, both transgenic extracts have a better antioxidant capacity than WT extract. Both transgenic extracts have similar results of EC50 performed by DPPH method, however the TT8 extracts showed the highest antioxidant capacity under ABTS experimental condition. Therefore, types and concentration of flavonoids in the extract could directly affect the antioxidant capacity.
Abstract: Microbial diversity based on plant-microbe interaction as well as most fungal diseases which are such multipathogen complexes have been long researched. Most beneficial microbes promote the growth of the plant but inhibit the growth of plant pathogen as biocontrol agents and are reported for their establishment being microbial communities associated to the plant roots. We were interested in understanding the antagonistic activity of root-associated bacterial communities in the rhizospheres. In this experiment, common bacteria associated with banana root exudation that were cultivated and isolated harbored specific antagonistic to common pathogen. In the experiments, the root (rhizosphere), and interior of the pseudostem (endosphere) samples were high CFU counts in the extracted endosphere than in rhizosphere of banana roots (6-8 and 4-5 CFU/ g, respectively). Antibacterial activity as bioactive agents were detected from these microbes as antagonis activity against plant pathogens that were Bacillus indicus, Pseudomonas palleroniana, Penicillium spp and Fusarium oxysporum. both mixed consortia could control Fusarium, fungal pathogen in banana. From this study, the isolates of indigenous bacteria obtained from banana rhizosphere can be potential for agricultural uses as further as disease-suppressive microorganisms provides promising perspectives for sustainable plant protection.
Abstract: It has been long known for the beneficial activity of meat LAB starters in prevention of the growth of spoilage bacteria. However, the bacteria can also produce favorable conditions for the growth of other beneficial microorganisms as well as eliminate the risk of bacterial growth and prevent meat spoilage. In this study, the LAB starters after isolated from commercial fermented pork were inoculated into the meat in the traditional meat fermentation process. It showed that the bacteria could be lowering pH of the fermentation to 5.2. The results revealed that LAB starters could inhibit pathogenic bacterial growth of L. monocytogenes within 3 days as well as lowering pH thus inducing the numbers of LAB as higher activity of sugar utilization and producing lactic acid. Therefore, all these data can indicate the benefits of LAB on the indigenous beneficial species in meat fermentation process.
Abstract: We investigated effects of spacing and no. of seedling hill-1 on growth and yield component of rice cv. Chai Nat 1 in system of rice intensification. The experiment included 25 × 25 cm, 30 × 30 cm, 40 × 40 cm, and 50 × 50 cm with single seedling hill-1, two seedlings hill-1, and three seedlings hill-1, respectively. The study was in Kasetsart University Chalermphrakiat Sakonnakhon Province Campus during November 2016 to March 2017. Each condition was laid out in a randomized completed block design with three replications. The experiment found that the no. of seedlings hill-1 influence in the growth and the yield component of the rice, while the spacing does not. Moreover, there is no interaction between spacing and seedlings hill-1. The three seedling hill-1 condition showed the highest in tillering (avg. = 24.13 tillers hill-1). The single seedling hill-1 showed the lowest in tillering (avg. = 16.24 tillers hill-1). From this research indicated that optimized seed hill-1 in rice cultivated system.
Abstract: The biodiversity of local plants on Phraek Nam Daeng community Amphawa, Samut Songkhram province, Thailand has been the result of the terrain as a source of freshwater and salty. This study was carried out to evaluate the phytochemical screening and nutritional value of 6 local plants in the Phraek Nam Daeng community including: Azima sarmentosa Benth, Pluchea indica (L) Less,, Boehravia diffusa L, Acanthus ilicifolius L, Sesuvium portulacastrum L and Derris trifoliata Lour. The phytochemical analysis was performed for alkaloid, tannin, terpenoid, flavonoid, anthraquinone and cardiac glycoside. Nutritional analysis of proximal composition of local plants using the method of AOAC (2005),Which consist of moisture content, protein content, lipid content, fiber content, total ash content and carbohydrate content. The results showed that phytochemical screening of 6 local plants, the methanolic extracts have the presence of bioactive substances such as alkaloid, tannin, terpenoid, flavonoid, anthraquinone and cardiac glycoside. The most nutritional composition of local plants showed that the moisture content was Sesuvium portulacastrum L, protein content was Acanthus ilicifolius L, lipid and carbohydrate content was Azima sarmentosa Benth. & Hook, fiber content was Pluchea indica (L) Less., these represent the potential of food crops for food security and sustainable use of biodiversity.
Abstract: In this paper, the cockle shell was studied as a catalyzer for biodiesel production. The cockle shell was heated at the various temperatures from 200 to 1300 °C for 4 h in the furnace. Then, the crystal structure and function group of unheated and heated cockle shell were characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR), respectively. The results indicated that the initial phase of cockle shell is aragonite phase. After heat at 400 °C, the aragonite phase transformed to calcite phase. Moreover, the calcite phase of cockle shell was completely changed to calcium oxide (CaO) after heated at 800 °C. Eventually, the yield of biodiesel used the CaO derived from cockle shell were determined by nuclear magnetic resonance spectroscopy (NMR). The results show that the CaO derived from cockle shell can be used as a catalyzer of biodiesel preparation. However, the biodiesel used CaO from cockle shell after heated at 1100 to 1300 °C as a catalyzer have the higher yield than other heated temperature. Finally, the results of this research indicated that the CaO from cockle shell could be used as a catalyst for biodiesel production.