cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.5281/zenodo.3379815
title: NanoValid D.5.47 Annex 2: Inter-laboratory comparison on measurand Surface Charge (Zeta Potential) of 15 nm Lys-SNPs-B1 Silica Nanoparticles Particles

description: An inter-laboratory comparison on the surface charge, expressed as zeta potential <em>ζ</em>, of nanoscaled SiO<sub>2</sub> has been performed using #14 BAM ~15 nm Lys-SNPs-B1 Silica nanoparticles (see D.5.41/5.42). The comparability of results delivered by participants has been tested. The Task 5.4 of NanoValid is designed to test, compare and validate current methods to measure and characterize physicochemical properties of selected engineered nanoparticles. The measurand is <em>Surface charge expressed as zeta-Potential</em>. The measurements are to be accompanied by estimates of the uncertainties at a confidence level of 95%, deduced from the standard uncertainties. Therefore an uncertainty budget comprising statistical (Type A) and systematic (Type B) errors has to be established and delivered for the measurand.
DOI: 10.7910/dvn/iwkd1c/007md6
title: Análisis de Datos de Ensayo TESIS ERICK GUTIERREZ.tab

description: :unav
DOI: 10.7910/dvn/iwkd1c/jpgvwo
title: Altura de planta.xlsx

description: :unav
DOI: 10.7910/dvn/iwkd1c/ofttsk
title: DATOS de mortalidad de planta TESIS ERICK GUTIERREZ.tab

description: :unav
DOI: 10.7910/dvn/iwkd1c/piatgp
title: cosecha siete.xlsx

description: :unav
DOI: 10.7910/dvn/iwkd1c/qg7ekt
title: cosecha seis.xlsx

description: :unav
DOI: 10.7910/dvn/iwkd1c/s0aeki
title: Copy of promedio datos para hacer graficas.tab

description: :unav
DOI: 10.7910/dvn/iwkd1c/uhq5ws
title: Cosecha Uno.tab

description: :unav
DOI: 10.14457/cu.the.2007.2027
title: Application of data reconciliation and gross error detection in mixing tank for battery production process

description: Process measurements are taken in chemical plant for the purpose of evaluating process control or process performance. In general, measured data inherently contain inaccurate information because measurements are obtained with imperfect instruments. The error in measured data can lead to significant deterioration in process performance. Data reconciliation and gross errors detection techniques are the techniques widely applied in various production processes for reducing the effect of measurement error. Therefore, the application of these techniques in mixing tank for battery production process is very attractive. This work is divided into two case studies. The first case study is to determine the reconciled data from the data reconciliation problem formulated by using three different methods: Contaminated normal distribution, Lorentzian distribution, and Hampel's redescending M-estimator. The other case study is to test the performance of these three methods under the condition of measurement with different degree of error. The results of these methods for nominal case which contain only random errors the three different methods used provide good reconciled value and in the test case which contain both gross errors and random errors, the [rho] function of Hampel’s redescending M-estimator is the most appropriated function for data reconciliation in mixing tank of battery production process.
DOI: 10.14457/cu.the.2007.2028
title: A scheduling in flexible flow shop problem with unrelated parallel machines and sequence-dependent setup times

description: To study a scheduling problem of flexible flow shop, where at least one production stage is made up of unrelated parallel machines, and setup times are sequence- and machine-dependent. The objective is to find a schedule that minimizes the makespan and the number of tardy jobs in a static scheduling environment. For this problem, a 0-1 mixed integer programming is formulated. The model is, however, a combinatorial optimization problem which is too difficult to be solved for large-sized problems, and hence, a heuristic is developed to obtain good solutions in reasonable time. The heuristic has three phases. The first phase uses a constructive algorithm. It starts with the generation of the operating time representative for each operation. Then, it uses a dispatching rule or a simple flow shop makespan heuristic to determine an initial solution. The improvement algorithm based on shift moves or pairwise interchanges of jobs is applied to improve the solution in the second phase. After that, a metaheuristic is used to refine the solution in the final phase. Several well-known heuristics are tested in each phase. The performances of the heuristics are compared to one another based on a set of test problems with up to 50 jobs and 20 stages and with an optimal solution for small-sized problems. The computational results indicate that the Nawaz, Enscore, and Ham (NEH) algorithm is most suitable for determining the initial solution, the all-pairwise-interchange approach is good for improving the solution, and the simulated annealing algorithm is best metaheuristic for refining the solution.
DOI: 10.14457/cu.the.2007.2029
title: Molecular dynamics of M2 channel protein of influenza virus

description: The matrix protein 2 (M2), an integral membrane ion channel from influenza A virus, plays an essential role in the viral replication process. Due to the emergence of bird flu disease and the drug resistant strain of H5N1, the M2 channel has become an important target for anti-flu drug development. Molecular dynamics (MD) simulations of the proton-selective transmembrane M2 channel in fully hydrated phospholipid bilayer were carried out to investigate structural and dynamic properties underlying the proton transport mechanism. Molecular mechanism of protein function relies on the histidine residues of the tetrameric channel, acting like the gate for transport of a proton through membrane bilayer. For this study, all possible protonation states of the ionizable His37 were constructed to have neutral and positively charged imidazole up to +4. The six studied models correspond to non-, mono-, di- (at adjacent and diagonal subunit), tri- and tetraprotonation states. The results show that except for non- and di -protonation states at adjadcent position, the transport of water molecule across the channel was observed. In addition, the binding of amantadine and rimantadine, the channel blocker, were also assessed by MD simulation approach. MD results suggested two potential binding sites for the drugs, i.e, the residues near the extracellular mouth and inside the inner cavity of the channel pore. Moreover, rimantadine showed the blocking activity of the water transport more efficient than amantadine. This biological activity of the drugs agrees well with experimental data. For the last topic of the thesis, MD simulations of the drug resistant M2 mutants were performed. Three single mutants including S31N, A30T, and L26I were studied to gain insight into molecular mechanisms of drug binding and resistance. The results indicated that in tri-protonation state amantadine loses its function in the A30T mutant while the degree of resistance to amantadine in the L26I mutant is higher than that in the S31N mutant.
DOI: 10.14457/cu.the.2007.2030
title: Theoretical study of alcohols conversion to ethers and ethylene by H-ZSM-5 using ONIOM method

description: Reaction mechanisms of methanol and ethanol conversion to dimethyl ether, diethyl ether and ethylene on the H-ZSM-5 were investigated using a 56/5T cluster model of H-ZSM-5 in corporation with the two-layered ONIOM(B3LYP/6-31G(d):AM1) approach. The concerted and stepwise mechanisms of methanol and ethanol conversion to dimethyl ether, diethyl ether and ethylene were comparatively studied. The concerted process occurring over Bronsted acid site of H-ZSM-5 zeolite is more favorable by 11.37 kcal/mol than the stepwise process in methanol coversion to dimethyl ether and 20.15 kcal/mol than the stepwise reaction in ethanol conversion to diethyl ether. In the stepwise reaction of ethanol conversion to ethylene occurring over Bronsted acid site of H-ZSM-5 zeolite is moer favorable by 9.11 kcal/mol than the conserted reaction. In the concerted reaction of ethanol conversion to diethyl ether occurring over Bronsted acid site of H-ZSM-5 zeolite is more favorable by 29.26 kcal/mol than the concerted process in ethanol conversion to ethylene. In the stepwise reaction of ethanol conversion to ethylene occurring over Bronsted acid site of H-ZSM-5 zeolite is more favorable by 28.07 kcal/mol than the stepwise process in ethanol conversion to diethyl ether. These reaction mechanisms in acid-catalyzed system were also investigated and compared to their corresponding reactions. The reaction energies and thermodynamic properties of all reaction mechanisms are reported.
DOI: 10.14457/cu.the.2007.2031
title: Machine replacement in cooking oil bottling process

description: This project is a machine replacement project in cooking oil bottling process in a company. The objective is to plan and implement the replacement of the bottle making machine. The bottle making machine needed replacing for two basic reasons that were its insufficient production capacity which caused the bottleneck in the bottling process and high cost per bottle because of inefficiency. After the preliminary requirements of the project were identified, machine feasibility study was then done to sort out all the issues and to justify the selection of the option. Four options were considered. Justifications for option selection were based on financial comparison, using equivalent uniform annual cost, as well as intangible factors, using weighted scoring method. The selected option was to install a new machinery with some plant layout improvement. The implementation was carried out with project management approach. Post implementation audit was caried out to determine the success of the project. After implementing the project, the new machinery achieved the expected capacity to remove the bottleneck in the bottling process to make it meet the demand for the next five years. The production cost was lowered by 20%. The cost reduction was a result of the better efficiency of the new machine and the improved operation which reduced the handling of the bottles by 55%.
DOI: 10.14457/cu.the.2007.2032
title: Characteristics and catalytic properties of nano-Pd/Tio[subscript 2] catalyst prepared by flame spray pyrolysis

description: The characteristics and catalytic properties of nano-Pd/TiO[subscript 2] catalysts prepared by one-step flame spray pyrolysis with various Pd loadings 0.5-10 wt% and various TiO[subscript 2] crystallite sizes of 9.7 to 24.6 nm were studied. Pd/TiO[subscript 2] catalysts prepared by impregnation method and commercial TiO[subscript 2] were used for comparison. Based on characterization results from various techniques such as XRD, TEM, N[subscript 2] physisorption, CO-pulse chemisorption, and XPS, addition of Pd during one-step flame spray synthesis of Pd/TiO[subscript 2] catalysts resulted in smaller crystallite size of TiO[subscript 2] and higher amount of rutile phase in the TiO[subscript 2]. It is indicated that Pd particles inhibited the crystal growth of TiO[subscript 2] during the flame spray synthesis. Moreover, the single-step flame spray catalysts had much lower amount of Pd on surface than those prepared by conventional impregnation method: this was probably due to that Pd particles were covered by Ti-O groups. However, for a similar Pd loading, the FSP-derived Pd/TiO[subscript 2] catalysts exhibited higher specific activities (TOF) than the impregnated ones in liquid-phase hydrogenation of 1-heptyne with no difference in 1-heptene selectivity. However, the TOFs decreased with increasing amount of Pd loading. The TOFs of FSP-Pd/TiO[subscript 2] catalysts also decreased from 102-23 s[superscript -1] when TiO[subscript 2] crystallite size increased from 9.7 to 24.6 nm whereas the impregnated catalysts and the catalysts prepared on commercial TiO[subscript 2] exhibited similar TOF of around 6-12 s[superscript -1]. It is considered that the single-step flame spray pyrolysis modified and improved the catalytic properties of Pd/TiO[subscript 2] catalysts especially when the catalysts were prepared with low Pd loading and small TiO[subscript 2] crystallite size.
DOI: 10.14457/cu.the.2007.2033
title: Extraction of phenolic compound from fruits of bitter melon (Momordica charantia) with subcritical water and antioxidant activities

description: Bitter melon (Momordica charantia) is traditionally known for its medicinal properties such as antidiabetic, anticancer, anti-inflammation, antivirus, and cholesterol lowering effects. It contains many phenolic compounds that may have the potential as antioxidant and antimutagen. Although the value of bitter melon is realized, scientific information on phenolic composition of bitter melon and antioxidant and antimutagenic activities of its extracts from food grade solvents are limited. This study were investigated the total phenolic contents of bitter melon obtained by subcritical water extraction (SCWE) and antioxidant activities of these extracts. The effects of extraction temperature and water flow rate were considered and the results were compared with the extracts obtained by solvent extraction and soxhlet extraction. The subcritical water extraction of the total phenolic contents in bitter melon was carried out at the temperature between 130 degrees Celsius to 200 degrees Celsius and the effect of water flow rate was investigated in the range of 2 to 5 ml/min, while the constant pressure of 10 MPa. The most suitable extraction condition was found to be at the temperature of 150-200 degrees Celsius and flow rate of 2 ml/min. The total phenolic contents of bitter melon obtained by the SCWE, the solvent extraction, and soxhlet extraction were 52.63, 6.00, and 6.68 mg gallic acid equivalents (GAE)/g dry weight (DW), respectively. Overall, the extract obtained by SCWE was significantly higher than solvent extraction and soxhlet extraction. The most phenolic acids contained in bitter melon were catechin. Catechin was calculated from HPLC analysis of the extracts from bitter melon obtained by the SCWE, the solvent extraction, and soxhlet extraction were 46.16, 1.61, and 1.77 mg/g DW, respectively. The subcritical water extraction at lower temperature gave higher antioxidant activity than the extracts obtained at higher temperature. The extract obtained by subcritical water extraction gave the higher antioxidant activity than solvent extraction, and soxhlet extraction. Even though the total phenolic contents between extraction method and extraction temperature were significantly different, their different antioxidant activities indicated that antioxidant activity was not depended only by their total phenolic contents. Thus, bitter melon is a good source of phenolic compounds and has high potent antioxidant activity.
DOI: 10.14457/cu.the.2007.2034
title: The effects of vitamin E in crude palm oil on growth performance, lipid peroxidation and tissue vitamin E concentration of broilers

description: An experiment was studied to investigate the effects of vitamin E in crude palm oil on growth performance, lipid peroxidation and tissue vitamin E concentration of broilers. Total 576 day old male Ross 308 broiler chicks were randomly allocated into 6 treatments which composed of 6 replicates of 16 birds each. Corn-soybean meal basal diets with 8% lard which was adjusted vitamin E level according to the recommended requirement (50 mg/kg diet) by adding [alpha]-tocopheryl acetate, was used as a control diet. Crude palm oil (CPO) was substituted to lard at the level of 0, 2, 4, 6, and 8 % respectively. Positive control was conducted to evaluate vitamin E efficacy in CPO by supplementation of [alpha]-tocopheryl acetate 100 mg/kg control diet. Diets were calculated to meet Ross requirement. On day 21 and 42 of the experiment, body weight and feed intake were recorded and six broilers in each treatment group of each period were randomly selected. On day 21, blood and liver were collected while blood, liver, breast and thigh meat were collected on day 42. Thiobarbituric acid-reactive substances (TBARS) and vitamin E concentration of all forms were analyzed in plasma, liver, breast and thigh meat. Relationship between vitamin E concentration in diet and tissues were calculated by linear regression. TBARS were determined on days 4 and 7 and drip loss was measured on day 2, 4, 6 and 8 day in breast and thigh meat in controlled-chilled room at 8 degree celcius. The results demonstrated that growth rate and feed conversion ratio were not significant difference among treatment groups in both periods (P&gt;0.05). An increasing of CPO level increased tocopherol and tocotrienol concentration in liver breast and thigh meat when compared to control group (P&lt;0.05). Broilers fed with CPO 8% had highest deposition of tocotrienol while the positive control group has highest tocopherol concentration in tissue. Form of vitamin E deposition in tissues, [alpha]-tocopherol had highest follow by [alpha]-tocotrienol, [gamma]-tocopherol and [gamma]-tocotrienol respectively. The tocopherols, tocotrienols and total vitamin E concentration in all tissues showed the positive relationship with crude palm oil level in diet (P&lt;0.05). Inclusion of CPO as a vitamin E source at the level of 4% or more in diet decreased TBARS in plasma at the age of 21 and 42 day (P&lt;0.001) when compare to control and CPO at the level of 6 and 8% fed group were not difference with positive control group. No significant difference of TBARS was found in liver and breast meat while thigh meat of CPO fed groups were significant difference when compared to control group(P&lt;0.001) but not significant difference with positive control group. During storage, inclusion of CPO as a vitamin E source in diet decreased TBARS and CPO from the level of 4% and onward decreased drip loss in breast and thigh meat when compare to control group and not significant difference with positive control group.
DOI: 10.14457/cu.the.2007.2035
title: Lead particulate generated from ruby heat treatment in Chanthaburi province

description: Lead glass heating has been long used in the gem industry in Thailand. Recently, it has become a concern to environmental scientists and the gemologist communities because of its dangers to health and the environment. Hence, determination was made of lead concentration in respirable particulate from the process of ruby heat treatment involving lead glass. Two home factories in Chanthaburi Province were selected for the sampling sites. Three parts of sample collections including 1) emission profile of lead from the ruby treatment furnace, 2) exposure of the treater to lead in the home factory and 3) lead concentration in indoor air of the home factory. The results show that lead particulate can emit from the furnace only during gate opening period and the highest concentrations were found within the first 10 min after gate opening. In addition, lead particulate emitted from furnace increases as amount of lead additive or ruby increases. Regarding determination of lead exposure to the treater and residents, the results clearly indicate that both mixing step and opening period of furnace are the main periods of lead exposure. Moreover, higher amounts of lead additive added into the process appear to emit higher amounts of lead. For indoor lead concentration, ruby heat treatment using lead glass clearly elevates the lead concentration within the home factory and providing an efficient ventilation system and separating the treatment area from living area can reduce the effect of lead from the process.
DOI: 10.14457/cu.the.2007.2036
title: Effects of melt viscosity reduction of polycarbonate by low molar mass liquid crystal

description: This work is devoted to the investigation of the effect of the reduction in melt viscosity of Polycarbonate by low molar mass liquid crystal chemical. The simple viscoelastic model, Maxwell model, was also chosen to explain the mechanism of the reduction and investigate the rheological parameters of the system. The phase behavior of low molar mass liquid crystal (LLC) and polycarbonate blends is firstly reported. The results of small angle light scattering (SALS) indicate that the LLC is miscible in the mixture for weight fractions of LLC less than 6%. For the study of the rheological properties, mixtures of two different liquid crystals with different molecular weight of polycarbonate were prepared inside the miscible regime of the blend. Both the complex and steady shear viscosities of the blends were found to be significantly decreased upon addition of small amounts of liquid crystal. At low shear rate, the steady state shear viscosity was similar to the pure polycarbonate, whilst, at higher shear rates, three further regimes of behavior, as has been described for liquid crystals and liquid crystal polymers, were found despite the low concentration of LLC; hence, the rheological properties of the blends can be significantly modified by small concentrations of LLC (as low as 1%). The decrease in melt viscosity of polycarbonate that we observe upon addition of LLC is not due to lubrication effects at the interfaces, as shown by reproducible oscillatory shear flow sweeps. The further study the effect of LLC content on the interdiffusion property, the diffusion coefficient was obtained using Nuclear Reaction Analysis (NRA) of bilayer films. An addition of only 1wt% liquid crystal to the polycarbonate significantly increased the diffusion coefficient, but at higher concentration the converse was found. To examine the bulk mechanical property, Dynamic mechanical analysis was used for observe the glass transition temperature of the blend. The decrease in Tg with liquid crystal content was found, in all cases the presence of single Tg indicates that blends are miscible.