Swift catalytic reduction of hazardous pollutants by new generation microgels

Soft Matter ◽  
2021 ◽  
Author(s):  
Vinai Kumar Singh ◽  
Krishna Kumar ◽  
Nishant Singh ◽  
Rudramani Tiwari ◽  
S. Krishnamoorthi
Keyword(s):  
Catalytic Reduction ◽  
Cross Linker ◽  
Hazardous Pollutants ◽  
New Generation ◽  
First Time

In this manuscript, we first time report the new generation microgel synthesis without using any divinyl functionalized cross-linker. New generation less crosslinked microgel structure has been achieved by optimizing the...

Recent developments in low-voltage SEM of polymers

1993 ◽  
Vol 51 ◽  
pp. 866-867
Author(s):  
S.J. Krause ◽  
W.W. Adams
Keyword(s):  
Low Voltage ◽  
Chromatic Aberration ◽  
Thermal Electron ◽  
Analytical Technique ◽  
Recent Developments ◽  
Beam Currents ◽  
New Generation ◽  
First Time ◽  
Voltage Scanning ◽  
Beam Damage

Over the past decade low voltage scanning electron microscopy (LVSEM) of polymers has evolved from an interesting curiosity to a powerful analytical technique. This development has been driven by improved instrumentation and in particular, reliable field emission gun (FEG) SEMs. The usefulness of LVSEM has also grown because of an improved theoretical and experimental understanding of sample-beam interactions and by advances in sample preparation and operating techniques. This paper will review progress in polymer LVSEM and present recent results and developments in the field.In the early 1980s a new generation of SEMs produced beam currents that were sufficient to allow imaging at low voltages from 5keV to 0.5 keV. Thus, for the first time, it became possible to routinely image uncoated polymers at voltages below their negative charging threshold, the "second crossover", E2 (Fig. 1). LVSEM also improved contrast and reduced beam damage in sputter metal coated polymers. Unfortunately, resolution was limited to a few tenths of a micron due to the low brightness and chromatic aberration of thermal electron emission sources.

scholarly journals Electrodeposition of Copper and Brass Coatings with Olive-Like Structure

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1762
Author(s):  
Artur Maciej ◽  
Natalia Łatanik ◽  
Maciej Sowa ◽  
Izabela Matuła ◽  
Wojciech Simka
Keyword(s):  
Corrosion Resistance ◽  
Cathodic Current Density ◽  
Bath Composition ◽  
Cathodic Current ◽  
Corrosion Properties ◽  
Fine Grained ◽  
Electrodeposited Coating ◽  
Copper Zinc ◽  
New Generation ◽  
First Time

One method of creating a brass coating is through electrodeposition, which is most often completed in cyanide galvanic baths. Due to their toxicity, many investigations focused on the development of more environmentally friendly alternatives. The purpose of the study was to explore a new generation of non-aqueous cyanide-free baths based on 1-ethyl-3-methylimidazolium acetate ionic liquids. The study involved the formation of copper, zinc, and brass coatings. The influence of the bath composition, cathodic current density, and temperature was determined. The obtained coatings were characterized in terms of their morphology, chemical composition, phase composition, roughness, and corrosion resistance. It was found that the structure of the obtained coatings is strongly dependent on the process parameters. The three main structure types observed were as follows: fine-grained, porous, and olive-like. To the best knowledge of the authors, it is the first time the olive-like structure was observed in the case of an electrodeposited coating. The Cu-Zn coatings consisted of 19–96 at. % copper and exhibited relatively good corrosion resistance. A significant improvement of corrosion properties was found in the case of copper and brass coatings with the olive-like structure.

El español de la isla de La Graciosa desde una perspectiva prosódica

2021 ◽  
Vol 137 (2) ◽  
pp. 451-476
Author(s):  
Imelda Chaxiraxi Díaz Cabrera ◽  
Carolina Jorge Trujillo
Keyword(s):  
Canary Islands ◽  
Grammatical Morphology ◽  
Paper Format ◽  
New Generation ◽  
First Time ◽  
The Town

Abstract Manuel Alvar published the only linguistic work known on Spanish from the island of La Graciosa (Canary Islands) in 1965, focused on the town of Caleta del Sebo, to document, in the field of Linguistic geography, the ALEICan (Linguistic and ethnographic atlas of the Canary Islands [1975–1978]). Alvar’s studies used to cover the lexical, grammatical (morphology and syntax) and phonetic levels of the segmental type, but he did not consider prosodic aspects of speech which would later be incorporated into a new generation of atlases, which would go from paper format to multimedia. As the main exponent, the AMPER project (Atlas Multimédia Prosodique de l’Espace Roman) was created in 2001 and, within its framework, we intend to describe the melodic characteristics of a group of sentences emitted by a man and a woman from Caleta del Sebo, completing thus the study started by Alvar fifty-five years ago. In this way, the results will show for the first time if there is a prosodic proximity between the eighth island and the seven main islands, which have been widely described in previous works both in formal and in informal speech.

Microstrip Gas Counters

2014 ◽  
pp. 31-51
Keyword(s):  
Glass Surface ◽  
Two Dimensional ◽  
Large Area ◽  
Proportional Chamber ◽  
Microelectronic Technology ◽  
Multiwire Proportional Chamber ◽  
Dimensional Version ◽  
A Chain ◽  
New Generation ◽  
First Time

In this chapter, the first micropattern gaseous detector, the microstrip gas counter, invented in 1988 by A. Oed, is presented. It consists of alternating anode and cathode strips with a pitch of less than 1 mm created on a glass surface. It can be considered a two-dimensional version of a multiwire proportional chamber. This was the first time microelectronic technology was applied to manufacturing of gaseous detectors. This pioneering work offers new possibilities for large area planar detectors with small gaps between the anode and the cathode electrodes (less than 0.1 mm). Initially, this detector suffered from several serious problems, such as charging up of the substrate, discharges which destroyed the thin anode strips, etc. However, by efforts of the international RD28 collaboration hosted by CERN, most of them were solved. Although nowadays this detector has very limited applications, its importance was that it triggered a chain of similar developments made by various groups, and these collective efforts finally led to the creation of a new generation of gaseous detectors-micropattern detectors.

scholarly journals Beyond switches: Rotaxane- and catenane-based synthetic molecular motors

2008 ◽  
Vol 80 (1) ◽  
pp. 17-29 ◽  
Author(s):  
Euan R. Kay ◽  
David A. Leigh
Keyword(s):  
Molecular Motors ◽  
Physical Science ◽  
Statistical Physics ◽  
Biological Process ◽  
Molecular Level ◽  
Molecular Machines ◽  
Interlocked Molecules ◽  
Recent Developments ◽  
New Generation ◽  
First Time

Nature uses molecular motors and machines in virtually every significant biological process, but learning how to design and assemble simpler artificial structures that function through controlled molecular-level motion is a major challenge for contemporary physical science. The established engineering principles of the macroscopic world can offer little more than inspiration to the molecular engineer who creates devices for an environment where everything is constantly moving and being buffeted by other atoms and molecules. Rather, experimental designs for working molecular machines must follow principles derived from chemical kinetics, thermodynamics, and nonequilibrium statistical physics. The remarkable characteristics of interlocked molecules make them particularly useful for investigating the control of motion at the molecular level. Yet, the vast majority of synthetic molecular machines studied to date are simple two-state switches. Here we outline recent developments from our laboratory that demonstrate more complex molecular machine functions. This new generation of synthetic molecular machines can move continuously and progressively away from equilibrium, and they may be considered true prototypical molecular motors. The examples discussed exemplify two, fundamentally different, "Brownian ratchet" mechanisms previously developed in theoretical statistical physics and realized experimentally in molecular-level devices for the first time in these systems.

scholarly journals ‘Independent’ Kurdish Media in Syria

2016 ◽  
Vol 9 (3) ◽  
pp. 334-351 ◽  
Author(s):  
Yazan Badran ◽  
Enrico De Angelis
Keyword(s):  
Political Identity ◽  
Political Context ◽  
The Political ◽  
Television Station ◽  
Radio Stations ◽  
News Agency ◽  
Local Media ◽  
The Media ◽  
New Generation ◽  
First Time

The Syrian uprising in 2011 was accompanied by the birth of a new generation of media outlets seeking to offer alternative narratives to those of the regime. After the Kurds gained a certain level of autonomy from the Syrian regime and opposition forces, areas historically inhabited by Kurds (Rojava) have also seen the emergence of local media: for example, the television station Ronahi, magazines and newspapers such as Welat, Buyer and Shar, radio stations such as Arta FM and Welat and the ARA News agency. Indeed, for the first time in their history, Syrian Kurds have the opportunity to have an independent voice in the media landscape. In this paper we map the field of emerging Kurdish media in Syria and analyze some of the main features of these outlets, while situating them in the larger context of emerging Syrian media. Moreover, the paper explores their relationship in the current political context of the Syrian uprising and, especially, of Rojava. In doing so, we analyze the political identity that these media tend to project and address how they position themselves toward the issue of the Kurdish identity in general and in Syria in particular.

scholarly journals LC-MS/MS analysis of neonicotinoid insecticides: Residue findings in chilean honeys

2018 ◽  
Vol 42 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Raquel Bridi ◽  
Arturo Larena ◽  
Paula Núñez Pizarro ◽  
Ady Giordano ◽  
Gloria Montenegro
Keyword(s):  
Geographical Area ◽  
Pollen Grains ◽  
Neonicotinoid Insecticides ◽  
Galega Officinalis ◽  
Ms Analysis ◽  
Three Samples ◽  
Residue Levels ◽  
New Generation ◽  
First Time

ABSTRACT Neonicotinoids are a relatively new generation of insecticides that have been used for control of pests such as aphids, leafhoppers and whiteflies. This paper presents for the first time a determination of residues of four neonicotinoid insecticides (acetamiprid, thiamethoxam, thiacloprid and imidacloprid) in Chilean honey using QuEChERS extraction and UHPLC-MS/MS analysis. The limits of detection and quantification found for all analytes ranging from 0.34 to 1.43 μg kg-1 and from 0.30 to 4.76 μg kg-1, respectively. The extraction using QuEChERS method provided recoveries over 79% and the precision showed coefficient of variation lower than 20%. These data are in agreement with the international criteria that recommend general recovery limits of 70 - 120%. Of the 16 samples analyzed, in three honey samples neonicotinoids pesticides were detected. These three samples were collected from the same geographical area (Rengo). Fruit and grain production characterize the province of Rengo. The analysis of the botanical origin of these honeys showed the absence of pollen grains of crops and the majority presence of pollen grains of weeds such as Medicago sativa, Galega officinalis and Brassica rapa, which could be associated with crops. Although the residue levels found were low, the results also confirm the actual occurrence of a transfer of neonicotinoid insecticides from exposed honeybees into honey.

scholarly journals Stellar Population Models with Variable Element Abundance Ratios

2005 ◽  
Vol 13 ◽  
pp. 189-190
Author(s):  
Daniel Thomas ◽  
Claudia Maraston ◽  
Ralf Bender
Keyword(s):  
Absorption Line ◽  
Wavelength Range ◽  
Stellar Population ◽  
Population Models ◽  
Element Abundance ◽  
Variable Element ◽  
New Generation ◽  
First Time

AbstractWe present a comprehensive set of new generation stellar population models of Lick absorption line indices, which for the first time include element abundance ratios different from solar. We computed the 21 Lick indices CN1, CN2, Ca4227, G4300, Fe4383, Ca4455, Fe4531, C24668, Hβ, Fe5015, Mg1, Mg2, Mgb, Fe5270, Fe5335, Fe5406, Fe5709, Fe5782, Na D, TiO1, and TiO2, in the wavelength range 4000 ≲ λ ≲ 6500 Å. Models are provided with: [α/Fe] = 0.0, 0.3, 0.5, [α/Ca] = -0.1, 0.0, 0.2, 0.5, and [α/N] = −0.5, 0.0; ages from 1 to 15 Gyr; total metallicities from 1/200 to 3.5 solar (-2.25 ≤ [Z/H] ≤ 0.67).

scholarly journals Radio-Frequency-Based NH3-Selective Catalytic Reduction Catalyst Control: Studies on Temperature Dependency and Humidity Influences

Sensors ◽  
2017 ◽  
Vol 17 (7) ◽  
pp. 1615 ◽  
Author(s):  
Markus Dietrich ◽  
Gunter Hagen ◽  
Willibald Reitmeier ◽  
Katharina Burger ◽  
Markus Hien ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Selective Catalytic Reduction ◽  
New Technologies ◽  
Catalytic Reduction ◽  
Special Focus ◽  
Temperature Range ◽  
Scr Catalysts ◽  
Rf Signals ◽  
High Space ◽  
First Time

The upcoming more stringent automotive emission legislations and current developments have promoted new technologies for more precise and reliable catalyst control. For this purpose, radio-frequency-based (RF) catalyst state determination offers the only approach for directly measuring the NH3 loading on selective catalytic reduction (SCR) catalysts and the state of other catalysts and filter systems. Recently, the ability of this technique to directly control the urea dosing on a current NH3 storing zeolite catalyst has been demonstrated on an engine dynamometer for the first time and this paper continues that work. Therefore, a well-known serial-type and zeolite-based SCR catalyst (Cu-SSZ-13) was investigated under deliberately chosen high space velocities. At first, the full functionality of the RF system with Cu-SSZ-13 as sample was tested successfully. By direct RF-based NH3 storage control, the influence of the storage degree on the catalyst performance, i.e., on NOx conversion and NH3 slip, was investigated in a temperature range between 250 and 400 °C. For each operation point, an ideal and a critical NH3 storage degree was found and analyzed in the whole temperature range. Based on the data of all experimental runs, temperature dependent calibration functions were developed as a basis for upcoming tests under transient conditions. Additionally, the influence of exhaust humidity was observed with special focus on cold start water and its effects to the RF signals.

Acanthocephalans from Red Sea fishes. Family Cavisomidae Meyer, 1932: The seasonal cycle of Diplosentis nudus (Harada, 1938) Pichelin et Cribb, 2001 in a definitive fish host, and a comment on Sclerocollum Schmidt et Paperna, 1978

2006 ◽  
Vol 51 (2) ◽  
Author(s):  
Reda Hassanine
Keyword(s):  
Red Sea ◽  
Definitive Host ◽  
Seasonal Cycle ◽  
Fish Host ◽  
Valid Genus ◽  
South Sinai ◽  
Rastrelliger Kanagurta ◽  
One Year ◽  
New Generation ◽  
First Time

AbstractSpecimens of the fishes Rastrelliger kanagurta (Scombridae) and Siganus luridus (Siganidae) were caught in the Red Sea off the coast of Sharm El-Sheikh, South Sinai, Egypt. R. kanagurta was parasitised by Diplosentis nudus (Harada, 1938) Pichelin et Cribb, 2001 (Acanthocephala, Cavisomidae), and S. luridus by Sclerocollum rubrimaris Schmidt et Paperna, 1978 (Acanthocephala, Cavisomidae). The infection of R. kanagurta was followed monthly for one year (from September, 2004 to August, 2005). As a result, the seasonal cycle of D. nudus in its definitive host is described herein for the first time. The cycle is well-defined and extends for about 11 months (from October to August); in October, new generation of D. nudus starts to appear in the intestine of R. kanagurta; during the winter, the juvenile worms continued their growth; during the spring, most of the worms attained maturity and the mature worms copulated; during the summer, the worms began to die off naturally prior to their elimination from the intestine of the host. Sclerocollum rubrimaris is redescribed and Sclerocollum Schmidt et Paperna, 1978 is retained as a valid genus within the Cavisomidae.

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