scholarly journals Sorption of surfactants onto sediment at environmentally relevant concentrations: independent-mode as unifying concept

2020 ◽  
Vol 22 (5) ◽  
pp. 1266-1286
Author(s):  
Hildo Krop ◽  
Pim de Voogt ◽  
Christian Eschauzier ◽  
Steven Droge
Keyword(s):  
Dual Mode ◽  
Low Concentrations ◽  
Independent Mode ◽  
Better Than

The Independent-Mode model explains observed sorption phenomena of surfactants at low concentrations (Cs→0, Cw→0) to complex sediments better than the Dual-Mode model.

Compact dual-mode microstrip bandpass filter based on slotted square patch resonator

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Karthie S. ◽  
Zuvairiya Parveen J. ◽  
Yogeshwari D. ◽  
Venkadeshwari E.
Keyword(s):  
Bandpass Filter ◽  
Filter Design ◽  
Center Frequency ◽  
Dual Mode ◽  
Content Type ◽  
Transmission Zeros ◽  
Compact Size ◽  
Mode Response ◽  
Better Than ◽  
Good Agreement

Purpose The purpose of this paper is to present the design of a compact microstrip bandpass filter (BPF) in dual-mode configuration loaded with cross-loop and square ring slots on a square patch resonator for C-band applications. Design/methodology/approach In the proposed design, the dual-mode response for the filter is realized with two transmission zeros (TZs) by the insertion of a perturbation element at the diagonal corner of the square patch resonator with orthogonal feed lines. Such TZs at the edges of the passband result in better selectivity for the proposed BPF. Moreover, the cross-loop and square ring slots are etched on a square patch resonator to obtain a miniaturized BPF. Findings The proposed dual-mode microstrip filter fabricated in RT/duroid 6010 substrate using PCB technology has a measured minimum insertion loss of 1.8 dB and return loss better than 24.5 dB with a fractional bandwidth (FBW) of 6.9%. A compact size of 7.35 × 7.35 mm2 is achieved for the slotted patch resonator-based dual-mode BPF at the center frequency of 4.76 GHz. As compared with the conventional square patch resonator, a size reduction of 61% is achieved with the proposed slotted design. The feasibility of the filter design is confirmed by the good agreement between the measured and simulated responses. The performance of the proposed filter structure is compared with other dual-mode filter works. Originality/value In the proposed work, a compact dual-mode BPF is reported with slotted structures. The conventional square patch resonator is deployed with cross-loop and square ring slots to design a dual-mode filter with a square perturbation element at its diagonal corner. The proposed filter exhibits compact size and favorable performance compared to other dual-mode filter works reported in literature. The aforementioned design of the dual-mode BPF at 4.76 GHz is suitable for applications in the lower part of the C-band.

Listeners' Perceptions of Consonants Produced by Esophageal and Tracheoesophageal Talkers

1988 ◽  
Vol 53 (4) ◽  
pp. 400-407 ◽  
Author(s):  
Philip C. Doyle ◽  
Jeffrey L. Danhauer ◽  
Charles G. Reed
Keyword(s):  
Young Adult ◽  
Sound Field ◽  
Normal Hearing ◽  
Clinical Implications ◽  
Dual Mode ◽  
Pharyngoesophageal Segment ◽  
Te Mode ◽  
Audio Recordings ◽  
Confusion Matrices ◽  
Better Than

The purpose of this study was to investigate the consonant intelligibility of 3 esophageal (E) and 3 tracheoesophageal(TE) talkers, and 1 dual-mode (DM) talker proficient in both E and TE speech modes. Audio recordings of 24 English consonants produced by each talker in a consonant-vowel-consonant-vowel-consonant (CVCVC) context were presented in the sound field to 15 normal-hearing, naïve, young adult listeners who phonetically transcribed their responses using an open-response paradigm. Listeners' pooled responses were converted to confusion matrices and analyzed for overall intelligibility, voicing and manner features, and consonant omissions. Ratings of speech proficiency were also obtained. Overall, the intelligibility of the TE talkers was significantly better than that of the E talkers. The DM talker was also more intelligible in the TE mode. Voiced consonants, plosives, fricatives, nasals, and liquid-glides were signifieantly more intelligible when produced by TE talkers. Affrieates were also more intelligible for the DM talker in his TE mode. The different patterns of intelligibi!ity observed between the E and TE talkers studied may be due to temporal speech distinctions evolving from the influence of dissimilar driving sources upon the vibratory characteristics of the pharyngoesophageal segment. Clinical implications are presented.

scholarly journals Triangular Cavity Multi-Passband HMSIW Filter Based on Odd-Even Mode Analysis

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2927
Author(s):  
Luhua Zhang ◽  
Aiting Wu ◽  
Pengquan Zhang ◽  
Zhonghai Zhang
Keyword(s):  
Return Loss ◽  
Resonant Mode ◽  
Mode Analysis ◽  
Defected Ground Structure ◽  
Ground Structure ◽  
Dual Mode ◽  
Coupling Path ◽  
Overall Performance ◽  
Better Than ◽  
Good Agreement

This letter proposes a multi-passband half-mode substrate integrated waveguide (HMSIW) filter based on the theory of odd and even mode analysis. The filter adopts a triangular HMSIW cavity cut along the diagonal of the rectangle. By etching two dual-mode resonators, the resonant mode of the HMSIW resonator is coupled with the odd-even mode of the dual-mode resonator to achieve multiple passbands. The defected ground structure (DGS) of the filter can reduce the resonance frequency of the HMSIW cavity without increasing the volume of the HMSIW cavity, making it easier to couple with the odd and even mode frequencies of the resonator. The input and output ports are directly coupled through a microstrip line. In this way, it adds an additional coupling path to the filter, which increases the out-of-band suppression without changing the performance in the passband, and improves the overall performance of the filter. To prove the feasibility of the above method, a multi-passband HMSIW filter was fabricated and tested. The center frequencies of the three passbands of the filter are 2.98 GHz, 4.78 GHz, and 6.62 GHz, respectively. The return loss in the passband is better than −15 dB, and the insertion loss is better than 2 dB. The measured results have a good agreement with the simulation results.

scholarly journals Lora-WAN Powered by Renewable Energy, and Its Operation with Siri / Google Assistant

2020 ◽  
Vol 2 (5) ◽  
pp. 26-34
Author(s):  
Albin Joseph ◽  
Balamurugan M
Keyword(s):  
Renewable Energy ◽  
Data Compression ◽  
Communication Technology ◽  
Energy Resource ◽  
Small Data ◽  
Dual Mode ◽  
Data Packets ◽  
Internet Connection ◽  
Voice Control ◽  
Better Than

LoRa WAN is a newly emerged game changing communication technology for sending small data packets of size 50 bytes or less, wirelessly over an area of up to 10 Km without the need of an internet connection. LoRa WAN has its own frequency band and the band is different for every country. This technology is now starring to boost WSN technology better than ever before. This paper aims to, power up a LoRa Enabled Device or a LoRa Gateway by using a reliable dual mode non-conventional energy resource for storage and utilization, find peak performances altering the data rate that can be achieved in a LoRa WAN Communication (using Indoor RAK Gateway), make use data compression techniques, data packet encoding / decoding, Coding Apple Shortcuts, setting up Siri and Google Assistant for voice control and future scope.

Experimental Study on Absorbing CO2 from Coal-Fired Flue Gas

2012 ◽  
Vol 616-618 ◽  
pp. 1546-1549
Author(s):  
Wei Feng Zhang ◽  
Jian Shao
Keyword(s):  
Experimental Study ◽  
Hollow Fiber ◽  
Flue Gas ◽  
Hollow Fiber Membrane ◽  
Membrane Contactor ◽  
Mixed Solution ◽  
Fiber Membrane ◽  
Absorption Effect ◽  
Low Concentrations ◽  
Better Than

A small hollow-fiber membrane contactor system was used to test the absorption and desorption CO2 using mixed absorption solution of SG/PG and TEA. The results showed that absorption effect of SG was better than PG under low concentrations, but their desorption was the opposite. With the increase of concentration, the absorption effect of SG tended to weak, while the desorption was enhanced. And, PG was contrary. The absorption effect of mixed solution(SG+TEA, PG+TEA) was excellent when adding small amount of TEA. And, the absorption effect of TEA-SG mixed solution was amazing under the low concentration of SG. With the concentration of mixed solution increased, the auxo-action of TEA weakened. Instead, TEA played a active effect on promoting the absorption of TEA+PG mixture with the increasing of concentration. The hybrid experimental results shown that 3mol/L PG+0.1 mol/L TEA mixture absorption solution was best in absorption experiments, and 1mol/L PG+0.2 mol/L TEA mixture absorption solution was best in desorption experiments.

scholarly journals Synthesis of iron oxyhydroxide-coated rice straw (IOC-RS) and its application in arsenic(V) removal from water

2015 ◽  
Vol 13 (3) ◽  
pp. 726-736 ◽  
Author(s):  
Igor W. K. Ouédraogo ◽  
Erol Pehlivan ◽  
Hien T. Tran ◽  
Yvonne L. Bonzi-Coulibaly ◽  
Dieter Zachmann ◽  
...  
Keyword(s):  
Drinking Water ◽  
Rice Straw ◽  
World Health ◽  
Iron Oxyhydroxide ◽  
Thermogravimetric Analyzer ◽  
Low Concentrations ◽  
Equilibrium Data ◽  
Health Organization ◽  
Batch Data ◽  
Better Than

Because of the recognition that arsenic (As) at low concentrations in drinking water causes severe health effects, the technologies of As removal have become increasingly important. In this study, a simplified and effective method was used to immobilize iron oxyhydroxide onto a pretreated naturally occurring rice straw (RS). The modified RS adsorbent was characterized, using scanning electron microscope, Fourier transform infrared spectroscopy, thermogravimetric analyzer, and surface area analyzer. Experimental batch data of As(V) adsorption were modeled by the isotherms and kinetics models. Although all isotherms, the Langmuir model fitted the equilibrium data better than Freundlich and Dubinin–Radushkevich models and confirmed the surface homogeneity of adsorbent. The iron oxyhydroxide-coated rice straw (IOC-RS) was found to be effective for the removal of As(V) with 98.5% sorption efficiency at a concentration of <50 mg/L of As(V) solution, and thus maximum uptake capacity is ∼22 and 20 mg As(V)/g of IOC-RS at pH 4 and 6, respectively. The present study might provide new avenues to achieve the As concentrations required for drinking water recommended by the World Health Organization.

Urban snow dump quality and pollutant reduction in snowmelt by sedimentation

1993 ◽  
Vol 20 (1) ◽  
pp. 9-21 ◽  
Author(s):  
R. L. Droste ◽  
J. C. Johnston
Keyword(s):  
Suspended Solids ◽  
Specific Conductance ◽  
Fecal Coliforms ◽  
Snowmelt Runoff ◽  
Dump Site ◽  
Time Period ◽  
Low Concentrations ◽  
Pollutant Reduction ◽  
Very High ◽  
Better Than

Four snow dump sites in the Ottawa-Carleton region were analyzed for BOD, total and fecal coliforms, chlorides, sulfates, specific conductance, suspended solids, metals, and other parameters. Sites were sampled at various depths during the months of February through May. There was no trend in variation of quality in the dump piles with time. The black crust that formed on the top of the pile was heavily laden with solids and metals.Snowmelt samples were also taken over the same time period and analyzed for the above parameters. The process of snowmelt reduced the concentrations of most metals and suspended solids from the dump by 50–70%. Dissolved constituents in snowmelt are discharged at very high levels during the initial stages of snowmelt and rapidly decrease to low concentrations. Suspended solids and associated metals in snowmelt exhibited variability with snowmelt conditions and the state of the dump pile. The concentrations of a number of metals in settled snowmelt exceeded provincial objectives for surface waters.An analysis of settled snow dump and snowmelt samples for suspended solids and metals was conducted for settling periods of 1, 6, 12, and 24 h. A settling time from 2 to 6 h would achieve most of the removal that could be expected from sedimentation. The overall removal of suspended solids and the metals in settled snowmelt would generally be better than 90%. There were no significant trends in removal behavior as the snowmelt season progressed. The removal of metals lagged slightly behind the removal of suspended solids after settling because of the stronger association of metals with smaller sediment particles. The residue at the dump site is highly contaminated. Key words: snowmelt, runoff, stormwater, sedimentation, road deicing, snow dump, pollution.

Disulfiram is a potent inhibitor of rat 5-lipoxygenase activity

1987 ◽  
Vol 65 (12) ◽  
pp. 2503-2506 ◽  
Author(s):  
Lancelot Y. Choo ◽  
Denis Riendeau
Keyword(s):  
Polymorphonuclear Leukocyte ◽  
Potent Inhibitor ◽  
Lipoxygenase Activity ◽  
Reduction Product ◽  
Selective Protection ◽  
Low Concentrations ◽  
Lipoxygenase Inhibition ◽  
Wide Range ◽  
Better Than

The effect of disulfiram on the 5-lipoxygenase activity from rat polymorphonuclear leukocyte cell-free lysates was determined and compared with that of other thiocarbamoyl and aryl disulfides. Disulfiram was a potent inhibitor of the soluble 5-lipoxygenase causing 50% inhibition at submicromolar concentrations (0.4–0.7 μM). The inhibition by disulfiram was similar to that of bis(diisopropylthiocarbamoyl) disulfide with both compounds being about 100-fold more potent as inhibitors than the structurally related bis(4-methyl-1-homopiperazinylthiocarbonyl) disulfide analog. The potency of 5-lipoxygenase inhibition by disulfiram was comparable to that of diphenyldisulfide (IC50 = 0.2–0.4 μM), in the same range or better than most typically used inhibitors. However, the degree of inhibition by disulfiram was more sensitive to thiols than that of diphenyldisulfide, as shown by the selective protection against disulfiram inhibition by low concentrations of thiols. Diethyldithiocarbamate, the reduction product of disulfiram, was a less potent inhibitor of the 5-lipoxygenase activity, causing only a partial inhibition (40–60%) over a wide range of concentrations (2–30 μM). The results demonstrate that disulfiram is a potent inhibitor of 5-lipoxygenase in vitro and provide the basis for further investigations on the effect of the drug on leukotriene biosynthesis inhibition and its contribution to the ethanol–disulfiram reaction. They also indicate that disulfiram represents a sensitive reagent to characterize the thiol requirement of the 5-lipoxygenase reaction.

Prevalence of magnesium and potassium deficiencies in the elderly.

1987 ◽  
Vol 33 (4) ◽  
pp. 518-523 ◽  
Author(s):  
Y Touitou ◽  
J P Godard ◽  
O Ferment ◽  
C Chastang ◽  
J Proust ◽  
...  
Keyword(s):  
Human Subjects ◽  
Plasma Potassium ◽  
The Elderly ◽  
Large Set ◽  
Chi Square ◽  
Low Concentrations ◽  
Chi Square Test ◽  
The Mean ◽  
Plasma Magnesium ◽  
Better Than

Abstract Concentrations of magnesium and potassium in erythrocytes and plasma were determined in a population of 381 unselected elderly men and women, most of them in their eighties. The effects of biological factors (age, sex, weight) and a large set of pathological conditions, malignant or not, were examined. Analyses of variance showed a relation between age and concentrations of plasma potassium and between weight and concentrations of plasma magnesium. The chi-square test showed correlations between low concentrations of plasma magnesium and diabetes, abuse of alcohol and tobacco, and also between low values for erythrocyte magnesium and hypertension. Low values for plasma potassium were correlated with hypertension whereas high values were correlated with cardiovascular disease. Although some of the differences in the mean concentrations observed were statistically significant, these differences were always small. Most interesting was the distribution of the concentrations of the cations. This study shows that assays of both of these cations in erythrocytes were better than assays in plasma to evidence a deficiency. Indeed, about 20% of the studied population had low concentrations of both erythrocyte potassium and magnesium, whereas 2 and 10% had low values for plasma potassium and magnesium, respectively. This study underlines the large prevalence of magnesium and potassium deficiencies in the elderly, an observation we could not attribute to pathology or treatment. Routine electrolyte studies therefore appear to be justified in aged human subjects.

scholarly journals Dual Mode NOx Sensor: Measuring Both the Accumulated Amount and Instantaneous Level at Low Concentrations

Sensors ◽  
2012 ◽  
Vol 12 (3) ◽  
pp. 2831-2850 ◽  
Author(s):  
Andrea Groß ◽  
Gregor Beulertz ◽  
Isabella Marr ◽  
David J. Kubinski ◽  
Jaco H. Visser ◽  
...  
Keyword(s):  
Dual Mode ◽  
Low Concentrations ◽  
Nox Sensor
Sign in / Sign up

Export Citation Format

Share Document