Papers by Keyword: Spectroscopy

Abstract: This paper describes a preliminary study of the possibility for greenhouse interference during ammonia measurement in the 200nm-230 nm region. An absorption spectrum for ammonia was compared with the greenhouse gases absorption lines to theoretically justify that there were no discernible interference effects during the ammonia concentration measurements. It was theoretically found that the primary greenhouse gases namely ozone, methane and nitrous oxide have no significant interference for ammonia sensing in the 200nm-210 nmregion.

Abstract: Samples of polypropylene (PP), polyethylene (PE),polyester (PET), polylactide (PLA), and viscose (CV) non-woven fabrics, were exposed to blowing hot oven at 110°C temperature conditions separately for different times. In order to determine the state of thermal oxidation degradation, samples were examined by Tensile Properties, Scanning Electron Microscopy, Fourier Transform Infrared (FTIR) spectroscopy and Differential Scanning Calovimotry (DSC). These methods can be used to study and evaluate the sample thermal oxidation degradation.

Abstract: Based on the colorimetric theory and combined with the production process of glass industry, a color-difference measurement system was designed. The system was applied to online color-difference detection for coated glass. Scanning measurement of color-difference based on spectroscopy was detailed, and the technologies of light source modulation and signal demodulation synchronization were introduced into the system. This avoided using sensor masks or soft curtain to eliminate backlight interference. Under the light source with fluctuations and other background noise, the new system can get robust measurement values. The experimental results show that the anti-interference method smooths the curve of color-difference, and improves the signal-to-noise ratio. The system meets the demands of practical color-difference testing, and provides a new method for online color measurement with high accuracy.

Abstract: A rapid quantification technique is developed and validated for nondestructively quantifying Vitamin C content of navel orange using NIR spectroscopy in conjunction with genetic algorithm (GA) and Gene expression programming (GEP) algorithm. The spectral are recorded in the NIR region using the fiber optic probe method. Four data points of the navel orange NIR are selected by genetic algorithm and GEP algorithm by cross validation. In our experiment, the correlative coefficient between predicted and measured values in the training group is 0.9206, and that of the validation group is 0.8994, the results show that the proposed method can be built to a concise easily computed model, which has feasible accuracy.

Abstract: Spectrum analysis technology and advanced sensors can identify and estimate the plant growth and the press from environment. It can also estimate the weight of plant dry matter or predicted yield, process monitoring and management of greenhouse production quantitative and scientific. This paper focuses on the design of plant growth test instrument. The normal operation of the whole system is completed by two parts of software and hardware. The hardware is the foundation of the whole system, and the software is designed according to hardware. Software is the soul of the system, and the whole system work scheduling by it.

Abstract: A rapid quantification technique was developed and validated for nondestructively quantifying the soluble solids content of navel orange using NIR spectroscopy in conjunction with Gene expression programming (GEP) algorithm and genetic algorithm (GA).The spectra were recorded in the NIR region using the fiber optic probe method. Four data points of the navel orange NIR spectra were selected by GEP algorithm and genetic algorithm by cross validation. In our experiment, the mean standard error R_i between the prediction values and the real values in the train group is 0.0256, and the validation group is 0.0194, the results show that the proposed method can be built to a concise easily computed model, which has higher accuracy.

Abstract: Mild steel is one of the materials that used to build ships and other marine construction which go through current, streams, waves with different speed. The aim of this study is to investigate the effect of seawater flow speed on the corrosion rate of mild steel and the paint thickness degradation. The simulation is done at laboratory scale using mild steel coupons exposure under different flow velocity of seawater that are 2 m/s, 4 m/s, 6 m/s and as control is used stationary flow, 0 m/s. Electrochemical impedance spectroscopy is used to determine the corrosion rate occurred on the coupons plate surface and its paint degradation as function of immersion time. Scanning electron microscopy also is used to observe the plate surface rust and the damage of paint which occurred during the experiment. Experiment is run for thirty days for every water flow speed and the data is taken every ten days. The result of this study revealed that the corrosion rate and paint degradation are increased by the increasing of water flow velocity which is proposed to validate seawater flow rate as parameter that increased the paint damage and corrosion rate of mild steel plate.

Abstract: Spectral measurements of the night sky provide important information about natural light sources and light pollution. Analysis of spectral data enables identification of interesting events occurring in the atmosphere. We describe the used method and the technical solution, as well as first obtained results. Photometric and spectral simulations of the night sky light were performed under laboratory conditions. The results were compared with measured data of the whole night sky with respect to location and timing. The outdoor measurements provided spectroscopic data for examining the light pollution and night sky light background.

Abstract: Crime rates especially atrocities involving women have been ever increasing. Even in the presence of technologies like cell phones, tablets; people can hardly make use of them in their hour of need to prevent or at least halt misfortunes because of the promptness which such situations demands. This paper proposes a solution for maximizing the usage of technology in preventing crimes such as rape through the development of an automated system that will be able to gauge fear of a prospective victim and click pictures of the prospective criminal (s) and send them along with GPS coordinates or location information to the nearest police station and the relatives of the prospective victim. The proposed system can also be useful in aiding anti-theft systems in houses and stores.

Abstract: This paper describes the preparation and complementary characterization of a composite formed from the activation of titanium isopropoxide by phosphoric acid and deionized water (TiP).Techniques such as, X-ray diffraction (XRD), Raman , electronic (UV-vis) and Scanning electron microscopies (SEM) were used for characterization of this new composite formed. In the X-ray diffractogram of TIP was observed four intense peaks. A strong absorption was observed in the region 362-445 nm. The scanning electron microscopy of TiP, shows that the prepared material consists mostly of a cluster of spherical particles with diameters ranging from 2.35 to 2.60 μm.