Synthesis, Characterization And Co2 Adsorption Of Caco3, Ca(Oh)2 And Inert Materials Incorporated Ca(Oh)2

Calcium oxide (CaO) based materials have been proposed as potential candidates for CO2 adsorption to reduce the emission of carbon dioxide (CO2) into the atmosphere especially from the combustion of fossil fuel power plants. In this research, aragonite (CaCO3), calcite (CaCO3), calcium hydroxide (Ca(OH)2) and inert materials incorporated calcium hydroxide (Ca(OH)2) were synthesized by hydrothermal, sol-gel assisted hydrothermal and precipitation methods, respectively. Various parameters such as hydrothermal temperature (8 h - 72 h), addition of polyacrylamide (PAM), sodium hydroxide (NaOH) concentration (2 M - 10 M), cetyltrimethyl ammonium bromide (CTAB) concentration (0.2 M - 0.9 M) and different inert incorporated materials (Mg, Zr, Ce and (Zr-Ce)) on as-synthesized samples were characterized. And then, the CO2 adsorption performances of calcium oxide (CaO) based adsorbents derived from as-synthesized samples were investigated. In the case of hydrothermal method, 1D aragonite (CaCO3) nanorods are observed at 72 h hydrothermal reaction time when PAM is used as an additive, whereas 1D aragonite nanorods are obtained without using PAM at 12 h reaction time. In sol-gel assistance hydrothermal method, 3D calcite (CaCO3) hollow microspheres are attained with 2 M of NaOH concentration, while nanostructured calcium hydroxide (Ca(OH)2) is obtained by precipitation method at high CTAB concentration of 0.9 M. On the other hand, Mg, Zr, Ce and (Zr-Ce) incorporated Ca(OH)2 samples exhibit different surface morphologies. The CO2 adsorption capacities of calcium oxide (CaO) derived from 1D aragonite CaCO3 nanorods, 3D calcite CaCO3 hollow microspheres and nanostructured calcium hydroxide Ca(OH)2 after first cycles are 0.80 g-CO2/g-adsorbent, 0.62 g-CO2/g-adsorbent and 0.71 g-CO2/g-adsorbent, respectively. However, these capacities drop to 0.38 g-CO2/g-adsorbent, 0.39 g-CO2/g-adsorbent and 0.48 g-CO2/g-adsorbent after 10 cycles, respectively. It can be seen that CaO derived from Ca(OH)2 with surface area 64.57 m2/g exhibits the best CO2 adsorption capacity after 10 cycles (0.48 g-CO2/g-adsorbent), but the decay in adsorption capacity with number of cycles is observed. The development of cyclic stability can be observed in CaO-based adsorbents derived from Mg, Zr, Ce and (Zr-Ce) incorporated Ca(OH)2 samples. The CaO-based adsorbent derived from Mg-Ca(OH)2 shows slightly decrease in capacity from 0.67 g-CO2/g-adsorbent after first cycle to 0.57 g-CO2/g-adsorbent after 10 cycles, while CaO-based adsorbents produced from Zr and Ce-incorporated Ca(OH)2 samples exhibit the obvious cyclic stability during 10 cycles, 0.38 g-CO2/g-adsorbent and 0.24 g-CO2/g-adsorbent, respectively. The CaO-based adsorbent derived from (Zr-Ce) acetates incorporated Ca(OH)2 sample increases the capacity from 0.59 g-CO2/g-adsorbent after first cycle to 0.63 g-CO2/g-adsorbent after 10 cycles. The higher adsorption capacity and better cyclic stability during 10 cycles are attributed to the high BET surface area (155.80 m2/g), a wide range of micro/mesopore size distribution (1.7 nm - 30 nm) and the presence of high temperature sintering resistance Ce2Zr3O10 compound

Preparation and Characterization of Graphene Oxide and Graphene Synthesized from Rice Straw

Rice straws (RS) are good sources of low-cost adsorbents. Graphene Oxide (GO) and Graphene (G) have a huge absorption capacity for methylene blue (MB), which is competitive with other high-performance absorbents. The main aim of this research is to prepare GO that synthesized from carbon powder of rice straw (CRS) by using modified Hummer’s Method. After that Graphene (G) was prepared by using chemical reducing method. (RS) was collected from Einkyitaw Village, Mahlaing Township, Mandalay, Myanmar. The physicochemical properties of rice straw, GO and G were characterized by Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FT IR), X-Ray Diffraction Spectrometer (XRD), and UV-Vis spectrophotometer (UV). Surface areas and crystallite size of CRS, GO and G were calculated by using Sear’s method and Debye Scherrer equation. Characteristic results revealed the facts that GO and G which were successfully synthesized from carbon powder of rice straw for potential application wastewater treatments

Structural and Electrical Properties of Fluorine Doped Nanocrystalline Tin Oxide Thin Film

The application of thin film technology is entirely entered into all branches of science and technology. Fluorine doped tin oxide thin films belong to a special class of metal oxide thin film, nanostructure thin film solar cell. Fluorine doped tin oxide thin films prepared on glass substrate by sol-gel dip-coating method. The effect of dopant concentration of ammonium fluoride and heat treatment temperature of SnO2:F films on structural, surface morphology and electrical properties were investigated. The X-ray diffraction analysis of all SnO2:F films indicated the tetragonal structure of tin oxide with polycrystalline nature. The SEM micrographs of the SnO2:F films showed tetragonal crystal structure (flower like shape) and uniform surface pattern, at the optimized heat treated temperature 400 ºC. The best results were obtained the doping concentration of 7.5 % w/w ammonium fluoride at the heat treated temperature 400 ºC with the electrical resistance of 3.71 Ωsq-1

Statistical Machine Translation between Myanmar Sign Language and Myanmar Written Text

This paper contributes the first evaluation of the quality of automatic translation between Myanmar sign language (MSL) and Myanmar written text, in both directions. Our developing MSL-Myanmar parallel corpus was used for translations and the experiments were carried out using three different statistical machine translation (SMT) approaches: phrase-based, hierarchical phrase-based, and the operation sequence model. In addition, three different segmentation schemes were studies, these were syllable segmentation, word segmentation and sign unit based word segmentation. The results show that the highest quality machine translation was attained with syllable segmentations for both MSL and Myanmar written text

Extraction and Characterization of α -Amylase and α-Glucosidase Enzymes for Ethanol Preparation

In the research work, two enzymes (α -amylase and α-glucosidase) were extracted from germinated wheat grains and ungerminated flint corn by ammonium sulphate precipitation method for the bioethanol preparation. Moreover, their activities were determined by using Nelson-Somogyi Method. Qualitatively examination of α amylase and α -glucosidase were done by iodine staining method. The surface morphology of sorghum was determined by scanning electron microscope and the physicochemical properties were also determined. αAmylase was used for liquefaction of starch and α -glucosidase was used in saccharification step

Two Fingerspelling Keyboard Layouts for Myanmar SignWriting

Sign language is the first language for the Deaf. The Deaf people could communicate with the hearing people by Sign language. The use of sign language technologies in the interface of computing systems to improve their accessibility for deaf signers. In this paper, we propose two fingerspelling keyboard layouts for typing Myanmar fingerspelling characters with SignWriting. Fingerspelling is used in sign language to spell out names of people and places for which there is not a sign. We discuss the usability of our approach based on the user study and the evaluation results. The evaluations were made in terms of typing speed CPM (Character per Minute) and Likert scale feedbacks from both hearing-impaired and hearing users. The outcome of the research will be useful in implementing Myanmar SignWriting text input interface for Myanmar sign language

Development of Natural Language Processing based Communication and Educational Assisted Systems for the People with Hearing Disability in Myanmar

Information and communication technologies (ICTs) provide people with disabilities to better integrate socially and economically into their communities by supporting access to information and knowledge, learning and teaching situations, personal communication and interaction. Our research purpose is to develop systems that will provide communication and educational assistance to persons with hearing disability using Natural Language Processing (NLP). In this paper, we present corpus building for Myanmar sign language (MSL), Machine Translation (MT) between MSL, Myanmar written text (MWT) and Myanmar SignWriting (MSW) and two Fingerspelling keyboard layouts for Myanmar SignWriting. We believe that the outcome of this research is useful for educational contents and communication between hearing disability and general people

Effects of antiplatelet therapy on stroke risk by brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases: subgroup analyses of the RESTART randomised, open-label trial

Background Findings from the RESTART trial suggest that starting antiplatelet therapy might reduce the risk of recurrent symptomatic intracerebral haemorrhage compared with avoiding antiplatelet therapy. Brain imaging features of intracerebral haemorrhage and cerebral small vessel diseases (such as cerebral microbleeds) are associated with greater risks of recurrent intracerebral haemorrhage. We did subgroup analyses of the RESTART trial to explore whether these brain imaging features modify the effects of antiplatelet therapy

Significance of Consumption Patterns and ABC/FSN Matrix to Optimize Vital Drugs Inventory Management

Drug shortage affects patient’s life, especially life-saving medicines. The main objective of the study was to analyze the retrospective consumption data from 2016 in order to optimize the inventory management of vital drugs. 136 of vital drug items were categorized by ABC (Always Better Control) and FSN (Fast, slow and non-moving) matrix and analyzed the consumption patterns of vital drugs in each group. Total consumption value for vital drugs during 2016 were 361,091,149 Thai Baht. ABC and FSN matrix were sub-categorized into Category I (AF, AS, AN, BF, CF), Category II (BS, BN CS) and Category III (CN). Irregular consumption patterns from Category I and II, required special attention regarding stock control to overcome shortage and oversupply. Although Category III consists of non-moving items, these drugs have to be in stock in sufficient amount for emergency issues. Depending on the nature of consumption patterns, different inventory control methods are necessary for different characteristics of demand patterns