A promising hydrogen peroxide adduct of ammonium cyclopentazolate as a green propellant component

2020 ◽  
Vol 8 (25) ◽  
pp. 12334-12338 ◽  
Author(s):  
Jin Luo ◽  
Honglei Xia ◽  
Wenquan Zhang ◽  
Siwei Song ◽  
Qinghua Zhang
Keyword(s):  
Hydrogen Peroxide ◽  
Green Propellant ◽  
Application Potential ◽  
Promising Application

A novel hydrogen peroxide adduct of ammonium cyclopentazolate was successfully synthesized and shows promising application potential as a green propellant component.

scholarly journals Palladium selenide as a broadband saturable absorber for ultra-fast photonics

Nanophotonics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 2557-2567 ◽  
Author(s):  
Huanian Zhang ◽  
Pengfei Ma ◽  
Mingxiao Zhu ◽  
Wenfei Zhang ◽  
Guomei Wang ◽  
...  
Keyword(s):  
Pulse Width ◽  
Photonic Devices ◽  
Average Output ◽  
Electronic Band ◽  
Central Wavelength ◽  
Saturable Absorbers ◽  
Application Potential ◽  
Maximum Average Output Power ◽  
Promising Application ◽  
Er Doped

AbstractAir-stable broadband saturable absorbers (SAs) exhibit a promising application potential, and their preparations are also full of challenges. Palladium selenide (PdSe2), as a novel two-dimensional (2D) layered material, exhibits competitive optical properties including wide tunable bandgap, unique pentagonal atomic structure, excellent air stability, and so on, which are significant in designing air-stable broadband SAs. In our work, theoretical calculation of the electronic band structures and bandgap characteristics of PdSe2 are studied first. Additionally, PdSe2 nanosheets are synthesized and used for designing broadband SAs. Based on the PdSe2 SA, ultrafast mode-locked operations in 1- and 1.5-μm spectral regions are generated successfully. For the mode-locked Er-doped operations, the central wavelength, pulse width, and pulse repetition rate are 1561.77 nm, 323.7 fs, and 20.37 MHz, respectively. Meanwhile, in all normal dispersion regions, mode-locked Yb-doped fiber laser with 767.7-ps pulse width and 15.6-mW maximum average output power is also generated successfully. Our results fully reveal the capacity of PdSe2 as a broadband SA and provide new opportunities for designing air-stable broadband ultra-fast photonic devices.

scholarly journals A remixed-fermentation technique for the simultaneous bioconversion of corncob C6 and C5 sugars to probiotic Bacillus subtilis

2021 ◽  
Author(s):  
Xutong Ma ◽  
Yong Xu
Keyword(s):  
Bacillus Subtilis ◽  
Enzymatic Hydrolysis ◽  
Value Added ◽  
Probiotic Strain ◽  
Economic Benefits ◽  
Mixed Fermentation ◽  
G Cells ◽  
Application Potential ◽  
Promising Application

Abstract The probiotic strain of Bacillus subtilis presents a promising application potential for the value-added bio-utilization of lignocellulosic carbohydrates. By the combined acidolysis pretreatment and enzymatic hydrolysis, hemicellulose and cellulose constituents of corncob were efficiently converted respectively into fermentable C5 and C6 sugars, mainly including xylose and glucose. B. subtilis grew well in xylose solution while it was hindered completely in the acidolysis broth because of the bio-toxicity of degraded chemicals derived from corncob. A mixed-fermentation technique was therefore developed and performed to blend the acidolysis broth and enzymatic hydrolysis slurry together, by which C5 and C6 sugar molecules were successfully fermented and efficiently utilized for the growth of B. subtilis cells with a yield of 0.33 g cells/g sugar consumed. A net amount of 186.1 ± 0.9 g of B. subtilis powder was obtained from 1000 g of corncob that could improve the economic benefits of the process to around 5–7 times.

scholarly journals The design and performance on 200N-class bipropellant rocket engine using decomposed H2O2 and Kerosene

2019 ◽  
Vol 11 (3) ◽  
pp. 99-110
Author(s):  
Yang-Suk LEE ◽  
Jun Hwan JANG
Keyword(s):  
Hydrogen Peroxide ◽  
Rocket Engine ◽  
Test Methods ◽  
Liquid Rocket Engine ◽  
Flow Test ◽  
Wide Range ◽  
Green Propellant ◽  
And Performance ◽  
Liquid Rocket ◽  
Near Future

Mono-propellant thrusters are widely utilized in satellites and space launchers. In many cases, they are using hydrazine as a propellant. However, hydrazine has high toxicity and high risks in using for launch campaign. Recently, low-toxic (green) propellant is being highlighted as a replacement for hydrazine. In this paper, 200N bi-propellant engine using hydrogen peroxide/kerosene was designed/manufactured, and the spray or atomization characteristic and inflation pressure were determined by cold flow test, and combustion and pulse tests in a single cycle same as previous methods were conducted. As uniformly supplying hydrogen peroxide through plate-type orifice to a catalyst bed, the hot gas was created as a reaction with hydrogen and catalyst. And then, it was confirmed that the ignition is possible on the wide range of O/F ratio without additional ignition source. The liquid rocket engine with bi-propellant of hydrogen peroxide/kerosene and design/test methods which developed in this study are expected to be utilized as an essential database for designing of the ignitor/injector of bi-propellant liquid rocket engine using hydrogen peroxide/kerosene with high-thrust/performance in near future.

scholarly journals SABIO-RK: A data warehouse for biochemical reactions and their kinetics

2007 ◽  
Vol 4 (1) ◽  
pp. 22-30 ◽  
Author(s):  
Olga Krebs ◽  
Martin Golebiewski ◽  
Renate Kania ◽  
Saqib Mir ◽  
Jasmin Saric ◽  
...  
Keyword(s):  
Systems Biology ◽  
Kinetic Data ◽  
Biochemical Networks ◽  
System Level ◽  
Kinetic Properties ◽  
Biological Processes ◽  
Biochemical Reactions ◽  
Biochemical Pathways ◽  
Application Potential ◽  
Promising Application

Abstract Systems biology is an emerging field that aims at obtaining a system-level understanding of biological processes. The modelling and simulation of networks of biochemical reactions have great and promising application potential but require reliable kinetic data. In order to support the systems biology community with such data we have developed SABIO-RK (System for the Analysis of Biochemical Pathways - Reaction Kinetics), a curated database with information about biochemical reactions and their kinetic properties, which allows researchers to obtain and compare kinetic data and to integrate them into models of biochemical networks. SABIO-RK is freely available for academic use at http://sabio.villa-bosch.de/SABIORK/.

scholarly journals Phase behavior of heavy oil–solvent mixture systems under reservoir conditions

2020 ◽  
Vol 17 (6) ◽  
pp. 1683-1698 ◽  
Author(s):  
Xiao-Fei Sun ◽  
Zhao-Yao Song ◽  
Lin-Feng Cai ◽  
Yan-Yu Zhang ◽  
Peng Li
Keyword(s):  
Phase Behavior ◽  
Oil Recovery ◽  
Heavy Oil ◽  
Solvent Mixture ◽  
Average Error ◽  
Asphaltene Precipitation ◽  
Reservoir Conditions ◽  
Application Potential ◽  
Promising Application

AbstractA novel experimental procedure was proposed to investigate the phase behavior of a solvent mixture (SM) (64 mol% CH4, 8 mol% CO2, and 28 mol% C3H8) with heavy oil. Then, a theoretical methodology was employed to estimate the phase behavior of the heavy oil–solvent mixture (HO–SM) systems with various mole fractions of SM. The experimental results show that as the mole fraction of SM increases, the saturation pressures and swelling factors of the HO–SM systems considerably increase, and the viscosities and densities of the HO–SM systems decrease. The heavy oil is upgraded in situ via asphaltene precipitation and SM dissolution. Therefore, the solvent-enriched oil phase at the top layer of reservoirs can easily be produced from the reservoir. The aforementioned results indicate that the SM has promising application potential for enhanced heavy oil recovery via solvent-based processes. The theoretical methodology can accurately predict the saturation pressures, swelling factors, and densities of HO–SM systems with various mole fractions of SM, with average error percentages of 1.77% for saturation pressures, 0.07% for swelling factors, and 0.07% for densities.

Ion Beam Irradiation—An Efficient Method to Modify The Subnanometer Scale Microstructure of Polymers In A Controlled Way

1998 ◽  
Vol 540 ◽  
Author(s):  
Xinglong Xu ◽  
M. R. Coleman ◽  
U. Myler ◽  
P. J. Simpson
Keyword(s):  
Ion Irradiation ◽  
Gas Permeability ◽  
Ion Beam ◽  
Composite Membranes ◽  
Positron Annihilation Spectroscopy ◽  
Gas Permeation ◽  
Beam Irradiation ◽  
Ion Beam Irradiation ◽  
Application Potential ◽  
Promising Application

AbstractThe microstructural evolution of polymers induced by ion beam irradiation was investigated using gas permeation measurements with different molecule size gases and positron annihilation spectroscopy (PAS) using variable-energy positron. Simultaneous large increases in gas permeability and permselectivity of polymer-ceramic composite membranes modified by 180 keV H+ ion irradiation indicated that ion irradiation of polymers can modify the microstructure of polymer at sub-nanometer level in a controlled way. PAS results were consistent with the gas permeation results. The results of this work demonstrated ion beam irradiation has a promising application potential in the separation industry.

Aerodynamic Applications of SMA FRP Structures: An Active Airfoil, From Idea to Real Hardware

2015 ◽  
Author(s):  
Moritz Hübler ◽  
Sebastian Nissle ◽  
Martin Gurka ◽  
Ulf Paul Breuer
Keyword(s):  
Fiber Reinforced Polymer ◽  
Source Control ◽  
Suitable Model ◽  
The Finite Element Method ◽  
New Approach ◽  
Reinforced Polymer ◽  
Effective Selection ◽  
Application Potential ◽  
Promising Application ◽  
Selection Of

This contribution focuses on the application potential of active fiber reinforced polymer (FRP) structures with integrated shape memory alloy (SMA) elements for new aerodynamic functions. The advantages of hybrid SMA FRP structures are highlighted and promising application concepts are discussed. Main focus is the development of an active aerodynamic airfoil. Beginning with the idea of an adaptive airfoil, able to bear an application relevant down force at a relatively high deflection, the design process starts with an evaluation of different airfoil actuation concepts. A SMA powered bending beam is a part of the airfoil itself. Applying the finite element method with a suitable model for the active hybrid material, an effective selection of material and design is possible. After manufacturing and assembling of the active hybrid airfoil a comparison of experimental results and simulation is the first proof of success. Finally, the installation of an integrated hardware setup with power source, control and the active airfoil, demonstrating actuation on demand, verifies the potential of the new approach.

scholarly journals Identification and Expression of New Unspecific Peroxygenases – Recent Advances, Challenges and Opportunities

2021 ◽  
Vol 9 ◽  
Author(s):  
Alina Kinner ◽  
Katrin Rosenthal ◽  
Stephan Lütz
Keyword(s):  
Hydrogen Peroxide ◽  
Electron Acceptor ◽  
Protein Production ◽  
State Of The Art ◽  
Biotechnological Applications ◽  
Screening Strategies ◽  
Challenges And Opportunities ◽  
Application Potential ◽  
Oxidative Transformations ◽  
Screening Approaches

In 2004, the fungal heme-thiolate enzyme subfamily of unspecific peroxygenases (UPOs) was first described in the basidiomycete Agrocybe aegerita. As UPOs naturally catalyze a broad range of oxidative transformations by using hydrogen peroxide as electron acceptor and thus possess a great application potential, they have been extensively studied in recent years. However, despite their versatility to catalyze challenging selective oxyfunctionalizations, the availability of UPOs for potential biotechnological applications is restricted. Particularly limiting are the identification of novel natural biocatalysts, their production, and the description of their properties. It is hence of great interest to further characterize the enzyme subfamily as well as to identify promising new candidates. Therefore, this review provides an overview of the state of the art in identification, expression, and screening approaches of fungal UPOs, challenges associated with current protein production and screening strategies, as well as potential solutions and opportunities.

scholarly journals Stretchable Strain Sensor for Human Motion Monitoring Based on an Intertwined-Coil Configuration

Nanomaterials ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1980
Author(s):  
Wei Pan ◽  
Wei Xia ◽  
Feng-Shuo Jiang ◽  
Xiao-Xiong Wang ◽  
Zhi-Guang Zhang ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Strain Sensor ◽  
Dip Coating ◽  
Human Motion ◽  
Wearable Electronics ◽  
Special Configuration ◽  
Highly Stretchable ◽  
Application Potential ◽  
Promising Application ◽  
Human Motion Monitoring

Wearable electronics, such as sensors, actuators, and supercapacitors, have attracted broad interest owing to their promising applications. Nevertheless, practical problems involving their sensitivity and stretchability remain as challenges. In this work, efforts were devoted to fabricating a highly stretchable and sensitive strain sensor based on dip-coating of graphene onto an electrospun thermoplastic polyurethane (TPU) nanofibrous membrane, followed by spinning of the TPU/graphene nanomembrane into an intertwined-coil configuration. Owing to the intertwined-coil configuration and the synergy of the two structures (nanoscale fiber gap and microscale twisting of the fiber gap), the conductive strain sensor showed a stretchability of 1100%. The self-inter-locking of the sensor prevents the coils from uncoiling. Thanks to the intertwined-coil configuration, most of the fibers were wrapped into the coils in the configuration, thus avoiding the falling off of graphene. This special configuration also endowed our strain sensor with an ability of recovery under a strain of 400%, which is higher than the stretching limit of knees and elbows in human motion. The strain sensor detected not only subtle movements (such as perceiving a pulse and identifying spoken words), but also large movements (such as recognizing the motion of fingers, wrists, knees, etc.), showing promising application potential to perform as flexible strain sensors.

Modeling of Ultrashort Pulse-Train Laser Heating of Metal Films

2005 ◽  
Author(s):  
L. Jiang ◽  
H. L. Tsai
Keyword(s):  
Repetition Rate ◽  
Pulse Train ◽  
Energy Transport ◽  
Ultrashort Pulses ◽  
Pulse Number ◽  
Pulse Separation ◽  
Electron Heat Capacity ◽  
Electron Relaxation Time ◽  
Application Potential ◽  
Promising Application

Recently, a new laser micromachining technique using multiple ultrashort pulses with a picosecond-to-nanosecond separation as a train group has demonstrated some promising application potential, which also has high scientific merits in micro-/nano-scale ultrafast energy transport. However, the underlying physics of this technique remain poorly understood. In this study, the improved two-temperature model recently developed by the authors is used to analyze the pulse train technology, in which the full-run quantum treatments are used to calculate the significantly varying properties, including the electron heat capacity, electron relaxation time, electron conductivity, reflectivity, and absorption coefficient. This paper reports the effects of the pulse number per train, pulse separation, and repetition rate. Results from the present study have demonstrated that 1) it can increase the photon efficiency and further reduces the heat-affected zone; 2) the number of bursts required for melting decreases with the repetition rate, but at tens of MHz or higher, the repetition rate has a negligible impact; 3) the lattice temperature right after the thermolization time first increases to a peak and then decreases as the pulse separation increases.

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