Spectral Analysis of Audio Signals with Noise Assisted Empirical Mode Decomposition

Poly Rani Ghosh,Keikichi Hirose,Md. Khademul Islam Molla 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.4

A data adaptive approach to spectral analysis of audio signals is implemented in this paper. The audio signals are non-stationary as well as non-linear in nature and the traditional Fourier based spectral representation is not effective. The Hilbert spectral analysis implemented by noise assisted bivariate empirical mode decomposition (NA-BEMD) is introduced here as an efficient spectral representation scheme of audio signals. In BEMD, the fractional Gaussian noise (fGn) and analyzing speech signal are used as two separate variables. Both signals are decomposed together yielding a finite set of intrinsic mode functions (IMFs) for individual variables (signals). The use of fGn implements BEMD with dyadic filterbank characteristics. The instantaneous frequencies of individual IMFs are computed by applying Hilbert transform and then the time-frequency representation is achieved by arranging the energy with respect to time and frequency simultaneously. Such representation is called Hilbert spectrum (HS) which is analogous to spectrogram. The marginal HS derived from HS corresponds the total energy at each frequency component. The experimental results show that the Hilbert spectral analysis provides better representation of audio signal contents compared to the Fourier based approach.

Influence of Soil Type on Single and Competitive Retention Behavior of Inorganic Macro Cations in Binary as well as Ternary Solution

Poly Buragohain,Peng Lin,Ankit Garg,Sreedeep S,David Hui 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.12

Inorganic macro cations (Na+, K+ and Ca+) co-exist in agricultural and municipal landfill sites. The retention behavior of these ions in different soils and combinations (binary and ternary system) has not been fully understood by previous studies. This study seeks to probe into the retention behavior of macro cations (Na+, K+, Ca+2) in six different soils under multiple combinations of ions solution. The retention of common ions was quantified by using Freundlich and Langmuir isotherms. Na+ (single) pollutant-soil interaction was desorbed in most of the soils. The retention of K+ and Ca+2 was much greater than that of Na+. There is no definite trend for retention of Na+ in the presence of K+. For all soils, the retention results of K+ in the presence of Na+ decreased. Affinity for K+ was greater than that for Ca+2 in most of the soils. This study also demonstrated the affinity sequence of the ion retention for each soil and the percentage reduction of ions in competition with respect to single ions. Anomalous trends of the isotherm parameter fitting suggested the limitation of the mathematical models in predicting the experimental data. These results can be helpful in improving accuracy of fate prediction of pollutant fate and thus, design of waste containment facilities for various wastes that contains inorganic ions.

Efficacy of 1-MCP on the Internal Structure of Japanese Persimmon

( Poly Karmoker ),( Wako Obatake ),( Fumina Tanaka ),( Fumihiko Tanaka ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1

The efficacy of 1-MCP on the structural properties of Japanese persimmon was investigated at 0°C and 25°C for 8 and 4 weeks, respectively. X-ray computed tomography was employed to quantify the structural properties. The physicochemical properties such as moisture, apparent density, bio-yield stress, TSS and external color were measured destructively. 1-MCP satisfactorily delayed postharvest ripening in terms of bio-yield stress, L^* and hue angle value at both temperatures. The average CT value, standard deviation, and high density part progressed over the storage period at both temperatures. The degree of increment of those properties of the 1-MCP treated fruit was much lower compared to other treated fruit. Peak height of the control and 1-MCP treated fruit was nearly constant, whereas it increased in the ethylene and 1-MCP+ethylene treated fruit. The histogram profile also shifted to a high-density region slightly in the 1-MCP treated fruit. Whereas the histogram profile of the ethylene treated fruit was shifted most toward the high-density region with an increment of peak height. The changes in porosity and thermal conductivity in the 1-MCP treated fruit were smaller than those in the control, ethylene and 1-MCP+ethylene treated fruit. The changes in porosity and thermal conductivity of the ethylene treated fruit were significantly higher than those of all treated fruit at the end of storage period. The physicochemical properties were strongly correlated with the average CT value and standard deviation at both temperatures. The L^* value, hue angle, moisture content and bio-yield stress were negatively correlated with the average CT value and standard deviation, whereas the apparent density and TSS content were positively correlated. Thus X-ray CT images could be used to quantify the structural properties of persimmon fruit. The porosity and thermal conductivity distribution could be measured by using an X-ray CT device without destruction over the storage period. 1-MCP could suppress the changes in the internal structure of Japanese persimmon at 0°C and 25°C for 8 and 4 weeks, respectively.

농부의 손으로 가꾼 낙원 제주도의 ‘생각하는 정원’

포운 폴리(Poun Poly) 관훈클럽 2012 관훈저널 Vol.- No.125

Evaluating meander shifting dynamics (1977–2017) of the Bhagirathi river course in Murshidabad District, West Bengal, India

Anukul Ch Mandal,Poly Patra,Raja Majumder,Debashish Kumar Ghosh,Gouri Sankar Bhunia 대한공간정보학회 2018 Spatial Information Research Vol.26 No.1

Discernibility of Bhagirathi river course change detection was prepared via Remote Sensing and GIS in Murshidabad district among 41 years of period (1977–2017). Landsat MSS, TM, ETM?, TM, OLI sensor data from 1977, 1990, 2000, 2010 and 2017 respectively were considered to demarcate the chronological changes of the river course. Normalized Difference Water Index was used to extract the surface water bodies. Seventy-seven cross sections have been drawn to delimit the river course shifting pattern. The results shows that he Bhagirathi river course has been shifting towards south and west direction in different places, particularly in the lower and middle courses of the river. The adjacent riverine region has remained undeveloped due to infrastructure damaged by flood, changing course. Therefore, present study may be helpful for the overall management and planning for future prevention of flood, changing course, loss of properties.

Activated jute carbon paste screen-printed FTO electrodes for nonenzymatic amperometric determination of nitrite

Ahammad, A.J. Saleh,Pal, Poly Rani,Shah, Syed Shaheen,Islam, Tamanna,Mahedi Hasan, Md.,Qasem, Mohammed Ameen Ahmed,Odhikari, Noyon,Sarker, Subrata,Kim, Dong Min,Abdul Aziz, Md. Elsevier 2019 Journal of Electroanalytical Chemistry Vol.832 No.-

<P><B>Abstract</B></P> <P>Aiming at constructing a new nonenzymatic electrochemical nitrite sensor, we have prepared a screen-printed fluorine-doped tin oxide (FTO) electrode with activated jute carbon paste (AJCP) (AJCP-SP-FTO) synthesized from jute (<I>Corchorus</I> genus) sticks by using ZnCl<SUB>2</SUB> as activating agent and subsequent carbonizing at 850°C. Surface morphology, textural properties, chemical composition and nature of pores of AJC were studied by FE-SEM, XRD, EDS, Raman spectroscopy and BET analysis. The surface area of the AJC was found to be 1452.4m<SUP>2</SUP>/g with an average pore diameter of 2.6nm obtained from a BJH pore-size distribution curve. Electron transfer capacity at the interface of the AJCP material screen-printed FTO was studied by cyclic voltammetry (CV) and EIS techniques. The AJCP-SP-FTO sensor was used for amperometric detection of nitrite. The limit of detection (LOD) for nitrite oxidation was found to be 437nM for the proposed sensor. The sensitivity of AJCP-SP-FTO toward nitrite was 863.71μAmM<SUP>−1</SUP> cm<SUP>−2</SUP>. From the analysis of electrochemical data, the effective surface area of the AJCP-SP-FTO was 0.12cm<SUP>2</SUP>. We proposed a mechanism for sensitive detection of nitrite based on analysis of experimental findings of spectroscopic and electroanalytical techniques. We further utilized the proposed sensor for analyzing nitrite in tap water. The AJCP-SP-FTO electrode showed good reproducibility and stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Activated jute carbon (AJC) material was prepared by using ZnCl<SUB>2</SUB> as activating agent. </LI> <LI> Surface morphology, textural properties, chemical composition and nature of pores of AJC were studied. </LI> <LI> A novel AJC paste screen printed FTO electrode was constructed for nonenzymatic electrochemical determination of nitrite. </LI> <LI> The detection limit and sensitivity of nitrite were calculated to be 437 nM and 863.71 μA μM<SUP>-1</SUP> cm<SUP>-2</SUP>, respectively. </LI> <LI> A mechanism for detection of nitrite was proposed based on analysis of spectroscopic and electroanalytical techniques. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Reduced Graphene Oxide Screen-Printed FTO as Highly Sensitive Electrodes for Simultaneous Determination of Dopamine and Uric Acid

Ahammad, A. J. Saleh,Islam, Tamanna,Hasan, Md. Mahedi,Mozumder, M. N. Islam,Karim, Rejwana,Odhikari, Noyon,Pal, Poly Rani,Sarker, Subrata,Kim, Dong Min The Electrochemical Society 2018 Journal of the Electrochemical Society Vol.165 No.5

<P>A novel electrochemical sensor was fabricated by simply screen printing reduced graphene oxide (rGO) paste on F-doped tin oxide (FTO) (rGO-SP-FTO) followed by sintering at 450 degrees C in Argon and employed for detecting dopamine (DA) and uric acid (UA) simultaneously. The rGO film was characterized by using Raman spectroscopy, field emission scanning electron microscope (FE-SEM), and Fourier transform infrared spectroscopy (FTIR). The surface sensing features of rGO-SP-FTO were studied with electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The rGO-SP-FTO electrode exhibited foremost sensitivity in simultaneous detection of DA and UA without any interference from ascorbic acid (AA). The rGO-SP-FTO electrode showed a good linear response in the range of 0.5-50.0 mu M and 5.0-300 mu M with detection limits (S/N = 3) of 0.07 mu M and 0.39 mu M for DA and UA, respectively. The interactions between screen printed rGO with FTO electrode and their influence on how rGO-SP-FTO electrode interacted with UA, DA, and AA were analyzed from experimental observations. The rGO-SP-FTO electrode was able to detect DA in dopamine hydrochloride injection (DAI) and UA in urine sample effectively. Moreover, the designed electrochemical sensor exhibited excellent stability and reproducibility. (C) 2018 The Electrochemical Society.</P>

<i>Salmonella</i> exploits Arl8B‐directed kinesin activity to promote endosome tubulation and cell‐to‐cell transfer

Kaniuk, Natalia A.,Canadien, Veronica,Bagshaw, Richard D.,Bakowski, Malina,Braun, Virginie,Landekic, Marija,Mitra, Shuvadeep,Huang, Ju,Heo, Won Do,Meyer, Tobias,Pelletier, Laurence,Andrews‐,Poly Blackwell Publishing Ltd 2011 Cellular microbiology Vol.13 No.11

<P><B>Summary</B></P><P>The facultative intracellular pathogen <I>Salmonella enterica</I> serovar Typhimurium establishes a replicative niche, the <I>Salmonella</I>‐containing vacuole (SCV), in host cells. Here we demonstrate that these bacteria exploit the function of Arl8B, an Arf family GTPase, during infection. Following infection, Arl8B localized to SCVs and to tubulated endosomes that extended along microtubules in the host cell cytoplasm. Arl8B<SUP>+</SUP> tubules partially colocalized with LAMP1 and SCAMP3. Formation of LAMP1<SUP>+</SUP> tubules (the <I>Salmonella</I>‐induced filaments phenotype; SIFs) required Arl8B expression. SIFs formation is known to require the activity of kinesin‐1. Here we find that Arl8B is required for kinesin‐1 recruitment to SCVs. We have previously shown that SCVs undergo centrifugal movement to the cell periphery at 24 h post infection and undergo cell‐to‐cell transfer to infect neighbouring cells, and that both phenotypes require kinesin‐1 activity. Here we demonstrate that Arl8B is required for migration of the SCV to the cell periphery 24 h after infection and for cell‐to‐cell transfer of bacteria to neighbouring cells. These results reveal a novel host factor co‐opted by <I>S</I>. Typhimurium to manipulate the host endocytic pathway and to promote the spread of infection within a host.</P>

Risk indicators related to periimplant disease: an observational retrospective cohort study

Poli, Pier Paolo,Beretta, Mario,Grossi, Giovanni Battista,Maiorana, Carlo Korean Academy of Periodontology 2016 Journal of Periodontal & Implant Science Vol.46 No.4

Purpose: The aim of the present study was to retrospectively investigate the influence of potential risk indicators on the development of peri-implant disease. Methods: Overall, 103 patients referred for implant treatment from 2000 to 2012 were randomly enrolled. The study sample consisted of 421 conventional-length (>6 mm) non-turned titanium implants that were evaluated clinically and radiographically according to preestablished clinical and patient-related parameters by a single investigator. A non-parametric Mann-Whitney U test or Kruskal-Wallis rank test and a logistic regression model were used for the statistical analysis of the recorded data at the implant level. Results: The diagnosis of peri-implant mucositis and peri-implantitis was made for 173 (41.1%) and 19 (4.5%) implants, respectively. Age (${\geq}65$ years), patient adherence (professional hygiene recalls <2/year) and the presence of plaque were associated with higher peri-implant probing-depth values and bleeding-on-probing scores. The logistic regression analysis indicated that age (P=0.001), patient adherence (P=0.03), the absence of keratinized tissue (P=0.03), implants placed in pristine bone (P=0.04), and the presence of peri-implant soft-tissue recession (P=0.000) were strongly associated with the event of peri-implantitis. Conclusions: Within the limitations of this study, patients aged ${\geq}65$ years and non-adherent subjects were more prone to develop peri-implant disease. Therefore, early diagnosis and a systematic maintenance-care program are essential for maintaining peri-implant tissue health, especially in older patients.

Benzisothiazoles and $\beta$-Adrenoceptors: Synthesis and Pharmacological lnvestigation of Novel Propanolamine and Oxypro-panolamine Derivatives in Isolated Rat Tissues

Morini Giovanni,Poli Enzo,Comini Mara,Menozzi Alessandro,Pozzoli Cristina The Pharmaceutical Society of Korea 2005 Archives of Pharmacal Research Vol.28 No.12

In an attempt to examine the ability of benzisothiazole-based drugs to interact with $\beta$-adrenoceptors, a series of 1,2-benzisothiazole derivatives, which were substituted with various propanolamine or oxypropanolamine side chains in the 2 or 3 position, were synthesised and tested. The pharmacological activity of these compounds at the ,$\beta$-adrenoceptors was examined using isolated rat atria and small intestinal segments, which preferentially express the $\beta_{1}$- and $\beta_{3}$-adrenoceptor-mediated responses, respectively. None of these products showed any $\beta$-adrenoceptor agonistic activity. In contrast, the 2- and 3-substituted isopropyl, tert-butyl, benzyl, and piperonyl derivatives 2a-d and 3a-d elicited surmountable inhibition of the isoprena­line-induced chronotropic effects in the atria, suggesting competitive antagonism at the $\beta_{1}$­recognition site. The $pA_{2}$ values revealed tert-butyl 3b and the isopropyl substituted piperonyl derivatives 3a to be the most effective. Remarkably, many of the 2-substituted propanolamines were less active than the corresponding 3-substituted oxypropanolamines. With the exception of compound 3b, none of these drugs antagonised the muscle relaxant activity of isoprenaline in the intestine, suggesting no effect on the $\beta_{3}$-adrenoceptors. These results confirm the ability of the benzisothiazole ring to interact with the $\beta$-adrenoceptors, and demonstrate that 2-substitution with propanolamine or 3-substitution with oxypropanolamine groups yields compounds with preferential antagonistic activity at the cardiac $\beta_{1}$adrenoceptors. The degree of antagonism depends strongly on both the nature of the substituent and its position on the benzisothiazole ring.