Analysis of Process Variables via CFD to Evaluate the Performance of a FCC Riser by H. C. Alvarez-Castro, E. M. Matos, M. Mori, W. Martignoni, R. Ocone

“…The different operation process variables and hydrodynamic effects of the industrial riser of a fluid catalytic cracking (FCC) are evaluated. Predictions from the model are shown and comparison with experimental conversion and yields products are presented; recommendations are drawn to establish the conditions to obtain higher product yields in the industrial process.…”
Get full text

Flexural Properties of ECC-Concrete Composite Beam by Yanhua Guan, Huaqiang Yuan, Zhi Ge, Yongjie Huang, Shuai Li, Renjuan Sun

“…Test results show that the bonded composite beam had a higher loading capacity. But the unbonded composite beam showed better postcrack energy absorption capacity with higher midspan deflection. …”
Get full text

Intellectualized forensic technique for Android pattern locks by Jiahao QIU, Weidong QIU, Yangde WANG, Yan ZHA, Yuming XIE, Yan LI

“…In the field of digital forensics, how to unlock mobile devices such as phones has always been an urgent problem to overcome.As a special kind of password, pattern lock is widely used in mobile phone screen unlock and software access authorization.Existing pattern lock cracking techniques have several non-negligible disadvantages, such as poor concealment, low practicability, non-intelligence and single application scenario.Two basic threat models were abstracted from shoulder surfing, surveillance camera, and real-time forensics, and a multi-scenario side channel attack on pattern locks was proposed.Based on the data of surveillance camera or manual video, intelligent vision recognition algorithms were adopted to identify, select and track the target device and biological key points in the video dynamically.Then, discrete tracking points were integrated by spatial mapping and pruning algorithm.The denoising algorithm was used to eliminate redundancy and optimize the trajectory.Through procedures above, the original trajectory was simplified into regular polylines defined by several key turning points.Finally, the simplified pattern was compared and matched with the rules of legal pattern locks to inference and retort its actual pattern.Possible candidates will be sorted in the output according to their confidences.Results show that in the surveillance camera scenario, where the device screen is always visible, the cracking success rate of our technique is 89% for 10 attempts and 99.3% for 20 attempts.In the face-to-face scenario, where the subject consciously blocks the screen and his drawing finger, the success rate was 82% after 10 attempts and 89.3% after 20 attempts.In the surveillance camera scenario, the increase of shooting horizontal distance can significantly decrease the cracking success rate.But this effect diminishes with the increase of the number of attempts.Results show that the cracking success rate of the complex password is always higher than that of the simple password during 20 attempts, which means a complex pattern lock cannot play a better protection role if the proposed technique is applied.Shooting angle deflection within 5° has little effect on the success rate of cracking.…”
Get full text

Dynamic energy absorption of Cu–W interpenetrating phase composites by M. Hu, X.H. Lian, S.J. Li, Z.Q. Liu, Y.M. Wang, E.L. Tang, H. Peng, J.H. Hou, G.Y. Yang, J. Wang, R. Yang

“…The cubic W skeleton bears a higher stress than the bio-inspired skeleton. Cracking of the W skeleton and interfacial cracking between the Cu and W skeleton are more likely to occur. …”
Get full text

A Laboratory Investigation into the Effects of Coarse Aggregate Angularity on Performance of WMA by Jie Ji, Peng Zhai, Wenhua Zheng, Zhi Suo, Ying Xu

“…The test results indicated that the CAA value was linearly declined with the abrasive wearing passes increased. Higher CAA value improved the potential to resistance to rutting of WMA but was not suitable to enhance the resistance to thermal cracking of WMA due to sharp corners that caused higher stress concentration. …”
Get full text

The impact of the variation in vertical load and the presence of openings on the mechanical response of masonry walls by Khanfri Chaimae, Mouhat Ouadia, Elrhaffari Younes, El Mennaouy Fatima, Rougui Mohamed

Get full text

Stress Concentration in the Bulk Cr2O3: Effects of Temperature and Point Defects by Mazharul M. Islam, Thierry Couvant, Philippe Marcus, Boubakar Diawara

“…Higher susceptibility to cracking was observed in presence of defects compared to nondefective oxide, in agreement with experimental observation.…”
Get full text

Exploration of novel NSM methods to achieve stronger FRPs with minimal epoxy by Wei Sun, Handong Yan, Jianli Yin, Xinan Zhu, Tiejiong Lou, Haifeng Li

Get full text

The Effects of Annealing Parameters on the Crystallization and Morphology of Cu(In,Ga)Se2 Absorber Layers Prepared by Annealing Stacked Metallic Precursors by Chia-Ho Huang, Dong-Cherng Wen

“…As the heating rate increases, the surface morphologies of the CIGS films become looser and some cracks are observed. However, the influence of soaking time is insignificant and the selenization process only requires a short time when the precursors are selenized at a higher temperature with a lower heating rate and a higher Ar pressure. …”
Get full text

Particle Flow Analysis of Macroscopic and Mesoscopic Failure Process of Salt Rock under High Temperature and Triaxial Stress by Haoran Li, Ziheng Wang, Dekang Li, Yajun Zhang

“…During the heating process, the thermal cracks are mainly tensile cracks, and transverse cracks are gradually formed in the middle of the model. …”
Get full text

Rock fracture mode and acoustic emission characteristics under true triaxial single-sided unloading path by Longpei Ma, Longpei Ma, Chongyan Liu, Guangming Zhao, Guangming Zhao

“…The higher the peak strength of the rock after single-sided unloading is, the greater its axial average elastic modulus will be. …”
Get full text

Macroscopic Mechanical Properties and Microscopic Bonding Mechanisms of Glass Fiber-Modified Loess by Le Li, Wanjun Ye, Yang Bai, Yuntao Wu

“…Qualitative analysis of the SEM images show that with the increase in the glass fiber incorporation ratio, the fiber increasingly sutures the cracks in the soil and tightens the soil at both ends of the cracks. …”
Get full text

Experimental study on acoustic emission characteristics and damage-failure process of seawater sea-sand ultra-high-performance concrete under uniaxial compression by Tianyu Li, Yangtao Li, Tao Li, Xiamin Hu, Yuanhao Li, Jie Liao, Lidan Mei, Yuying Hou, Bokai Yang, Jinlong Gu

“…The damage evolution is mainly caused by tensile cracks, and the final failure shows large shear cracks, pull-out of steel fibers, and aggregate dislocation. …”
Get full text

Effect of Autoclave on Surface Topography of Various Rotary Files by R. Arasappan, N Sona Prabhakar, Vertika Mishra, K. P. Muhammed Y. Arafath, Jaya Singh, Antra Yadav

“…Gold-treated files displayed the least surface alteration, with a 15% increase in roughness and micro-cracks observed in only 10% of samples. Debris retention was notably higher in NiTi files post-sterilization. …”
Get full text

Investigations of Physical and Rheological Properties of Aged Rubberised Bitumen by Asim Hassan Ali, Nuha S. Mashaan, Mohamed Rehan Karim

“…In addition, the results showed that the softening point increment () and penetration aging ratio (PAR) of the rubberised bitumen binder decreased significantly due to crumb rubber modification. Furthermore, the higher crumb rubber content, the lower after PAV aging, which led to higher resistance to fatigue cracking bitumen.…”
Get full text

The Effect of Length and Content of Fiber on Glass Fiber and Basalt Fiber-Reinforced Granite Residual Soil by Weijie Chen, Jin Zhao, Litao Fan, Jia Li, Bingxiang Yuan, Hongzhong Li, Guoping Jiang, Hanbo Li, Tianying Chen

“…Fiber-reinforced soil boasts fewer cracks, higher energy absorption, and higher residual strength. …”
Get full text

Rheological and Morphological Characterization of Styrene-Isoprene-Styrene (SIS) Modified Asphalt Binder by Mithil Mazumder, Anwar Siddique, Raju Ahmed, Soon-Jae Lee, Moon-Sup Lee

“…The result of this study showed that (1) the addition of SIS modifiers increased the viscosity and had a positive effect on rutting resistance of the binder; (2) the addition of 5%, 10%, 15%, and 20% SIS content increased the rutting resistance by 600%, 3000%, 5600%, and 6400%, respectively; (3) the higher the SIS content, the better the cracking resistance of the binder and it is observed to have improved the stiffness by 26% and 51% with the addition of 5% and 10% content of SIS, respectively; (4) AFM images showed the significant correlation between the stiffness and microstructural properties of the binder; (5) the dominance of new oval phase over network structure was evident in ESEM images and observed to have significant correlation to the high stiffness of the binder; and (6) with the percentage increase of SIS modifier, the binder is found to have higher absorption at UV wavelength.…”
Get full text

Mechanical Properties and Micromorphology of Calcium Oxide Expansion Agent on River Sand/Machine-Made Sand Concrete by Feng Wei, Fei Zhang, Li Gao, Rui Wang, Xiang Ren, Dan Zhang

“…A large number of calcium hydroxide ((Ca(OH)2) crystals fill the pores and cracks and improve the frost resistance of concrete.…”
Get full text

Ultrastructural Changes in Human Trabecular Meshwork Tissue after Laser Trabeculoplasty by Jeffrey R. SooHoo, Leonard K. Seibold, David A. Ammar, Malik Y. Kahook

“…SLT-treated human TM revealed disruption of TM cells with cracked, extracellular pigment granules, particularly at higher treatment powers. …”
Get full text

Dynamic Model Test Based on Shaking Table of Wudongde High Arch Dam by XIONG Kun, HU Qingyi, CAO Quxiu

“…At present,there are few examples of high arch dams subjected to earthquakes in China and abroad,and there is a lack of sufficient and effective observation data of prototype seismic damage.Based on the shaking table dynamic model test,the seismic behaviors and damage process are studied for the 270 m-high Wudongde arch dam.The dam’s seismic failure mode of the dam body and structural seismically weak parts under strong earthquakes are compared and its seismic safety is evaluated.The results show that the model test analysis can obtain natural vibration characteristics and dynamic responses such as acceleration,dynamic strain,and transverse joint aperture under earthquakes,which are consistent with the numerical calculation results.Under extremely strong earthquakes,there are local cracks with limited extension depth near the foundation surface of the dam.The main damage area lies in the middle and upper part of the dam body,and horizontal macroscopic cracks occur in the area within about 1/3 of the height below the dam crest connecting the upstream and downstream.It is proved that the Wudongde high arch dam has a better stress condition,a smaller transverse joint aperture,and a higher ultimate seismic capacity under the design and calibrated earthquakes.…”
Get full text