How to Excel at Operational Stability

2014 ◽  
pp. 65-84
Keyword(s):  
Operational Stability

Endo-D-galacturonanase immobilized by adsorption on porous polyethyleneterephthalate

1982 ◽  
Vol 47 (10) ◽  
pp. 2716-2723 ◽  
Author(s):  
Lubomíra Rexová-Benková ◽  
Jiřina Omelková ◽  
Vladimír Kubánek
Keyword(s):  
Ionic Strength ◽  
High Stability ◽  
Relative Activity ◽  
Operational Stability ◽  
The Other ◽  
Fixation Strength ◽  
Action Pattern ◽  
Salt Solutions ◽  
Buffer Solution ◽  
Degradation Degree

Endo-D-galacturonanase of Aspergillus sp. was irreversibly adsorbed on polyethyleneterephthalate in an acetate 0.1 mol l-1 buffer solution of pH 4.2. Immobilization of the enzyme resulted in lowering of its activity, the measure of which depended on the amount of the enzyme fixed on the carrier. The highest relative activity (42.4%) had the preparation containing 5.25 mg of the enzyme per 1 g of the carrier. The velocity and intensity of the sorption of the enzyme depended on the ionic strength of the medium, whilst pH, on the other hand, was of no influence. Endo-D-galacturonanase immobilized in a 0.1 mol l-1 buffer was characteristic a) of its fixation strength in salt solutions of various ionic strength and pH, in a 3 mol l-1 guanidine solution, and also in sodium pectate and pectin solutions, b) of its high stability during a long-lasting storage at 4 °C, c) of its operational stability. The immobilization led to a partial change of the action pattern onto the high-molecular substrate, manifested in lowering the decrease of viscosity to degradation degree ratio.

Inoculum selection is crucial to ensure operational stability in anaerobic digestion

2014 ◽  
Vol 99 (1) ◽  
pp. 189-199 ◽  
Author(s):  
Jo De Vrieze ◽  
Sylvia Gildemyn ◽  
Ramiro Vilchez-Vargas ◽  
Ruy Jáuregui ◽  
Dietmar H. Pieper ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Operational Stability

A conjugated ligand interfacial modifier for enhancing efficiency and operational stability of planar perovskite solar cells

2021 ◽  
Vol 412 ◽  
pp. 128680
Author(s):  
Wenxiao Zhang ◽  
Xiaodong Li ◽  
Xiuxiu Feng ◽  
Xiaoyan Zhao ◽  
Junfeng Fang
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Operational Stability ◽  
Interfacial Modifier

Fast Pyrolysis of Wheat Straw—Improvements of Operational Stability in 10 Years of Bioliq Pilot Plant Operation

2021 ◽  
Author(s):  
Andreas Niebel ◽  
Axel Funke ◽  
Cornelius Pfitzer ◽  
Nicolaus Dahmen ◽  
Nicole Weih ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Pilot Plant ◽  
Fast Pyrolysis ◽  
Operational Stability ◽  
Plant Operation

scholarly journals Two-dimensional perovskites with alternating cations in the interlayer space for stable light-emitting diodes

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Yiyue Zhang ◽  
Masoumeh Keshavarz ◽  
Elke Debroye ◽  
Eduard Fron ◽  
Miriam Candelaria Rodríguez González ◽  
...  
Keyword(s):  
Thin Films ◽  
Near Infrared ◽  
Light Emitting Diodes ◽  
Interlayer Space ◽  
High Current Density ◽  
Operational Stability ◽  
Infrared Light ◽  
Two Dimensional ◽  
Commercial Development ◽  
Light Emitting

Abstract Lead halide perovskites have attracted tremendous attention in photovoltaics due to their impressive optoelectronic properties. However, the poor stability of perovskite-based devices remains a bottleneck for further commercial development. Two-dimensional perovskites have great potential in optoelectronic devices, as they are much more stable than their three-dimensional counterparts and rapidly catching up in performance. Herein, we demonstrate high-quality two-dimensional novel perovskite thin films with alternating cations in the interlayer space. This innovative perovskite provides highly stable semiconductor thin films for efficient near-infrared light-emitting diodes (LEDs). Highly efficient LEDs with tunable emission wavelengths from 680 to 770 nm along with excellent operational stability are demonstrated by varying the thickness of the interlayer spacer cation. Furthermore, the best-performing device exhibits an external quantum efficiency of 3.4% at a high current density (J) of 249 mA/cm2 and remains above 2.5% for a J up to 720 mA cm−2, leading to a high radiance of 77.5 W/Sr m2 when driven at 6 V. The same device also shows impressive operational stability, retaining almost 80% of its initial performance after operating at 20 mA/cm2 for 350 min. This work provides fundamental evidence that this novel alternating interlayer cation 2D perovskite can be a promising and stable photonic emitter.

Flexible perovskite solar cells with simultaneously improved efficiency, operational stability, and mechanical reliability

Joule ◽  
2021 ◽  
Author(s):  
Qingshun Dong ◽  
Min Chen ◽  
Yuhang Liu ◽  
Felix T. Eickemeyer ◽  
Weidong Zhao ◽  
...  
Keyword(s):  
Solar Cells ◽  
Perovskite Solar Cells ◽  
Operational Stability ◽  
Mechanical Reliability
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