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In trenchless pipe jacking engineering practice, the formation of high-quality slurry jacket on the outer wall of pipe section is the key to effectively reducing the pipe-soil frictional resistance, improving the construction efficiency, reducing the construction risk and ensuring the construction safety. Herein, the multifunctional experimental apparatus for the pipe-soil frictional resistance testing is improved to ensure the smooth implementation of the subsequent experimental research. The influences of the structural parameters of grouting holes in circular and rectangular pipe sections on the pipe-soil frictional resistance and the states of slurry jackets around the various pipe sections are investigated respectively based on orthogonal experiment. Key findings include the pipe-soil frictional resistances increase with the increase of the spacing between adjacent grouting holes and the deflection angle of grouting holes, the layout of grouting holes has the greatest influence on pipe-soil frictional resistance, reasonable and uniform layout of grouting holes around the pipe sections can form more complete high-quality slurry jackets, to show better pipe-soil frictional resistance reduction effect. Moreover, the optimal structural parameters of grouting holes in circular and rectangular pipe sections are the same, i.e. the layout is triple grouting holes, the spacing between adjacent grouting holes S is 417 mm, and the deflection angle of grouting holes α is 40°. These insights could provide some scientific and valuable guidance for pipe-soil frictional resistance reduction during trenchless pipe jacking. [ABSTRACT FROM AUTHOR]

As part of visible wavelength light‐emitting QLEDs' palpable progress, luminance efficiency and device operation stabilities for both red and green wavelengths are now viable for commercial display applications. [ABSTRACT FROM AUTHOR]

The fast degradation of blue QLED is the most challenging issue in QLED, and we found out the conduction band minimum offset between blue QDs and ZnO is the primary reason. Instead of optimizing ETL layer, we alternatively tailored QD core‐shell structure and achieved greatly enhanced lifetime of blue QLED. [ABSTRACT FROM AUTHOR]

Quantum dot light‐emitting diode (QLED) is expected to be a promising technology for the next generation display due to the unique advantages of quantum dots (QDs) materials. Great progress of QLEDs has been implemented by material synthetic optimizations and device fabrication improvements to meet commercial applications, including efficiency and lifetime. Meanwhile, high performance QLEDs were developed by the well‐controlling of the cavity length, which will accelerate the mass production of QLEDs display. [ABSTRACT FROM AUTHOR]

International Conference on Display Technology 2020 (V olume 52, Issue S1) 188 Strategies towards Enhancing Device Lifetime of Quantum-Dot LightEmitting Diodes (QLEDs) Yixing Yang, Wenyong Liu, Longjia Wu, Zizhe Lu, Yiran Yan and Xiaolin Yan TCL Research, Shenzhen, Guangdong, People's Republic of China Quantum dots (QDs) are considered as the ideal emissive materials for display because of their unique optical properties, such as size controllable emission wavelength, narrow emission spectra, and high luminescent efficiency, and can be then incorporated into the display modules in the manner of either photoluminescence (PL) or electroluminescence (EL) mode. The undesired TFB emission peaked in approximately 430 nm mostly observed in blue QLEDs is an evidence suggesting the significant injection energy barrier at the interface of HTL and wide band gap blue QDs. While QD-PL backlight display products had come into the market for a few years, quantum dot light emitting diodes (QLEDs) that electrically excite QDs are still under extensive investigation in the lab. [Extracted from the article]

23.1: Invited Paper: High efficiency and Stability of Ink-jet Printed Quantum Dot Light Emitting Diodes via Dual Ionic Surface Passivation. Here, ink-jet printed quantum dots LEDs with an external quantum efficiency over 16% and half lifetime of more than 1,721,000 hours, were reported for the first time. And the performance from ink-jet printed QLEDs truly opens the gate of quantum dots LED application for industry. [Extracted from the article]

An interatomic potential for Al is developed within the third generation of the charge optimized many-body (COMB3) formalism. The database used for the parameterization of the potential consists of experimental data and the results of first-principles and quantum chemical calculations. The potential exhibits reasonable agreement with cohesive energy, lattice parameters, elastic constants, bulk and shear modulus, surface energies, stacking fault energies, point defect formation energies, and the phase order of metallic Al from experiments and density functional theory. In addition, the predicted phonon dispersion is in good agreement with the experimental data and first-principles calculations. Importantly for the prediction of the mechanical behavior, the unstable stacking fault energetics along the [Formula: see text] direction on the (1 1 1) plane are similar to those obtained from first-principles calculations. The polycrsytal when strained shows responses that are physical and the overall behavior is consistent with experimental observations.