A Novel NO2 Sensor Applied in Natural Protected Area

2020 ◽  
Vol 15 (1) ◽  
pp. 19-23
Author(s):  
Qiang Zeng ◽  
Lingjiang Zhang
Keyword(s):  
Protected Area ◽  
Gas Diffusion ◽  
Ecological Environment ◽  
Two Dimensional ◽  
Hydrothermal Route ◽  
One Dimensional ◽  
The Road ◽  
One Step ◽  
No2 Sensor ◽  
National Nature Reserves

During the construction of highway, the exhaust emissions of equipment and vehicles will affect the ecological environment in a certain range around the road, especially in environmental sensitive areas such as national nature reserves, which need to be quantitatively studied. In this work, a novel two-dimensional net-like hierarchical WO3 nanostructure was synthesized by a one-step hydrothermal route. It was amazing that this novel two-dimensional WO3 show ultra-sensitivity towards NO2, primarily attributed to abundant gas diffusion channels and large gas-sensitive reaction surface area furnished by one-dimensional net-like WO3 nanowires. Benefiting from their novel characteristic, the two dimensional net-like WO3 based sensor has been applied in NO2 monitoring of the natural protected area.

scholarly journals Novel Pyran Derivative Ornamented with free Amino and Nitrile Functionalities: Synthesis and Spectroscopic Characterization

2019 ◽  
Vol 9 (1S3) ◽  
pp. 278-282
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Free Amino ◽  
Spectroscopic Characterization ◽  
Spectroscopic Methods ◽  
Two Dimensional ◽  
Spectral Techniques ◽  
One Dimensional ◽  
One Step ◽  
Pyran Derivative

A novel 4H-pyran derivative tethered with free amino and nitrile groups (1) was synthesized from commercially available meta-bromobenzaldehyde, malononitrile and 2-(methacryloyloxy)ethyl 3-oxobutanoate by adopting a one-step three components reaction strategy. The structure of the synthesized 1 has been established based on physical and spectroscopic methods such as infrared, one dimensional proton and carbon nuclear magnetic resonance as well as two-dimensional HSQC and HMBC spectral techniques.

High viscosity of polymer solutions supports life in soil hotspots

2020 ◽  
Author(s):  
Andrea Carminati ◽  
Pascal Benard ◽  
Mohsen Zarebanadkouki ◽  
Mutez A Ahmed
Keyword(s):  
Surface Tension ◽  
Liquid Phase ◽  
Soil Water ◽  
Polymer Solutions ◽  
High Viscosity ◽  
Gas Diffusion ◽  
Solid Matrix ◽  
Sudden Increase ◽  
Two Dimensional ◽  
One Dimensional

<p>Plant roots and bacteria alter the soil properties by releasing a polymeric blend of substances (e.g. mucilage and extracellular polymeric substances EPS). Despite extensive knowledge of their ecological importance, the physical mechanisms by which these polymers alter the spatial configuration of the liquid phase and the related hydraulic and biogeochemical properties remain unclear.</p><p>Here we show that upon drying in porous media polymer solutions form one-dimensional filaments and two-dimensional interconnected structures spanning across multiple pores. Unlike water, primarily shaped by surface tension, these structures remain connected upon drying thanks to their high viscosity. The integrity of one-dimensional structures is explained by the high viscosity and low surface tension of the polymer solutions (elegantly characterized by the Ohnesorge number). The formation of two-dimensional structures requires consideration of the interaction of the polymer solution with the solid surfaces and external drivers, such as the drying rate.</p><p>The implications of these physical processes for life in soils are manifold. After their deposition they enhance water retention by acting as a new solid matrix delaying the air entry, they maintain the connectivity of the liquid phase, thus enhancing the unsaturated hydraulic conductivity, diffusion and enzyme activity. Upon rewetting, the formation of extensive two-dimensional structures corresponds to a sudden increase in soil water repellency, which reduces the rewetting kinetics and maintains gas diffusion preventing sudden water saturation. In summary, these structures buffer fluctuations in soil water contents, protecting roots and soil microorganisms against severe drying and sudden rewetting in soil hotspots.</p>

Limit distributions for different forms of four-state quantum walks on a two-dimensional lattice

2015 ◽  
Vol 15 (13&14) ◽  
Author(s):  
Takuya Machida ◽  
C.M. Chandrashekar ◽  
Norio Konno ◽  
Thomas Busch
Keyword(s):  
Quantum Walks ◽  
Time Limit ◽  
Two Dimensional ◽  
View Point ◽  
Dimensional Lattice ◽  
One Dimensional ◽  
Limit Distributions ◽  
The Road ◽  
Long Time ◽  
Asymptotic Dynamics

Long-time limit distributions are key quantities for understanding the asymptotic dynamics of quantum walks, and they are known for most forms of one-dimensional quantum walks using two-state coin systems. For two-dimensional quantum walks using a four-state coin system, however, the only known limit distribution is for a walk using a parameterized Grover coin operation and analytical complexities have been a major obstacle for obtaining long-time limit distributions for other coins. In this work however, we present two new types of long-time limit distributions for walks using different forms of coin-flip operations in a four-state coin system. This opens the road towards understanding the dynamics and asymptotic behaviour for higher state coin system from a mathematical view point.

A one-dimensional self-gravitating stellar gas

1966 ◽  
Vol 25 ◽  
pp. 46-48 ◽  
Author(s):  
M. Lecar
Keyword(s):  
Gravitational Field ◽  
Phase Space ◽  
Motion Picture ◽  
Space Distribution ◽  
Two Dimensional ◽  
One Dimensional ◽  
Phase Space Distribution ◽  
Dimensional Phase Space ◽  
The Mean

“Dynamical mixing”, i.e. relaxation of a stellar phase space distribution through interaction with the mean gravitational field, is numerically investigated for a one-dimensional self-gravitating stellar gas. Qualitative results are presented in the form of a motion picture of the flow of phase points (representing homogeneous slabs of stars) in two-dimensional phase space.

Fabrication of Morphology of One-dimensional Nano-γ-AlOOH via Hydrothermal Route

2009 ◽  
Vol 24 (3) ◽  
pp. 463-468 ◽  
Author(s):  
Guang-Wei LU ◽  
Qi YANG ◽  
Yi-Da DENG ◽  
Wen-Bin HU
Keyword(s):  
Hydrothermal Route ◽  
One Dimensional

State-of-the-Art of Modeling Surface Water Impoundments

1982 ◽  
Vol 14 (1-2) ◽  
pp. 241-261 ◽  
Author(s):  
P A Krenkel ◽  
R H French
Keyword(s):  
Water Quality ◽  
Surface Water ◽  
State Of The Art ◽  
Rate Coefficients ◽  
Two Dimensional ◽  
One Dimensional ◽  
Integral Energy ◽  
Range Of Values ◽  
Dimensional Integral ◽  
Water Impoundment

The state-of-the-art of surface water impoundment modeling is examined from the viewpoints of both hydrodynamics and water quality. In the area of hydrodynamics current one dimensional integral energy and two dimensional models are discussed. In the area of water quality, the formulations used for various parameters are presented with a range of values for the associated rate coefficients.

The formation of gas hydrates under shock wave impact on the bubble media (two-dimensional case)

2010 ◽  
Vol 7 ◽  
pp. 90-97
Author(s):  
M.N. Galimzianov ◽  
I.A. Chiglintsev ◽  
U.O. Agisheva ◽  
V.A. Buzina
Keyword(s):  
Shock Wave ◽  
Gas Hydrates ◽  
Hydrate Formation ◽  
Dimensional Case ◽  
Two Dimensional ◽  
Wave Impact ◽  
Bubble Liquid ◽  
One Dimensional ◽  
Bubble Media ◽  
Main Factors

Formation of gas hydrates under shock wave impact on bubble media (two-dimensional case) The dynamics of plane one-dimensional shock waves applied to the available experimental data for the water–freon media is studied on the base of the theoretical model of the bubble liquid improved with taking into account possible hydrate formation. The scheme of accounting of the bubble crushing in a shock wave that is one of the main factors in the hydrate formation intensification with increasing shock wave amplitude is proposed.

Modifications of the Godunov method for computing disturbance propagation in an elastic body

2016 ◽  
Vol 11 (1) ◽  
pp. 119-126 ◽  
Author(s):  
A.A. Aganin ◽  
N.A. Khismatullina
Keyword(s):  
Elastic Body ◽  
Godunov Method ◽  
Two Dimensional ◽  
Dimensional Problem ◽  
Order Accuracy ◽  
One Dimensional ◽  
Disturbance Propagation ◽  
Linear Waves ◽  
Longitudinal And Shear Waves ◽  
Contact Discontinuities

Numerical investigation of efficiency of UNO- and TVD-modifications of the Godunov method of the second order accuracy for computation of linear waves in an elastic body in comparison with the classical Godunov method is carried out. To this end, one-dimensional cylindrical Riemann problems are considered. It is shown that the both modifications are considerably more accurate in describing radially converging as well as diverging longitudinal and shear waves and contact discontinuities both in one- and two-dimensional problem statements. At that the UNO-modification is more preferable than the TVD-modification because exact implementation of the TVD property in the TVD-modification is reached at the expense of “cutting” solution extrema.

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