In 1954, Mars and van Krevelen proposed the famous "redox" mechanism to rationalize oxidation of hydrocarbons (HCs) over vanadium oxide catalysts. According this mechanism, reduction catalysts (hydrogen abstraction, dehydroxylation, metal–oxygen bond cleavage) are kinetically relevant in most cases, oxides with high reducibility can be made into activity for HC (deep) oxidation. Such a framework, however, cannot explain fact that Pr6O11 liable lattice oxygen among lanthanide is worse...

Abstract The accurate prediction of Darcy‐scale permeability (absolute and gas‐water relative permeability) hydrate‐bearing sediments (HBS) plays a crucial role in assessing reservoir potential optimizing recovery strategies. However, the challenges field coring, rigorous conditions encountered laboratory tests, multi‐scale pore structure characteristics HBS complicate understanding relationship between structures HBS. In this study, we propose an innovative upscaling method that integrates...

The zona pellucida (ZP) micro-dissection technology has played a key role in the field of artificial assisted reproduction (such as ZP thinning, preimplantation genetic diagnosis (PGD), etc.). Currently, laser micro-cutting using far-infrared beam disadvantages high price, thermal damage, and low degree freedom. Piezoelectric ultrasonic matured at biological tissue level, but cutting single-cell level is still difficult to achieve. In this paper, based on piezoelectric theory, mechanism...

Biological microdissection has a wide range of applications in the field molecular pathology. The current laser-assisted dissection technology is expensive. As an economical method, piezoelectric ultrasonic broad application prospects. However, performance unsatisfactory. This paper aims to solve problems low dissecting precision and excessive wear needle caused by harmful lateral vibration present device. A device based on novel flexure mechanism proposed. By analyzing hinge flexibility,...

We analyze co-seismic displacement field of the 26 December 2004, giant Sumatra–Andaman earthquake derived from Global Position System observations, geological vertical measurement coral head, and pivot line observed through remote sensing. Using AK135 spherical layered Earth model, we invert slip distribution along seismic fault. also search best fault geometry model to fit data. Assuming that dip angle linearly increases in downward direction, postfit residual variation inversed with...

Parallel volume rendering is an effective approach, which can achieve fast of large-scale data sets by dividing the and then assigning them to different cluster nodes for in parallel. This paper presents some acceleration techniques each stage parallel-rendering- pipeline. In management, we employ a LOD method overcome constraints storage capacity speed up while maintaining image quality. rendering, use geometric template reduce huge computational cost CPU. Finally binary-swap algorithm used...

The paper studies the key techniques of precision cutting zona pellucida (ZP) on single-cell level. article first composition ZP and existing methods, draws main difficulties process. First, oocyte is an elastomer, which prone to deformation during process cannot be accurately positioned. Second, because individual cells are smaller in size than soft tissues, large lateral amplitudes ultrasonic can easily cause cell collapse. Aiming at this problem, proposes a new type targeted region...

Existing microinjection needles are curved needles, but most of the current cell injection devices designed for straight needles. In addition, existing needle causes large lateral vibration when membrane is broken. Although also considered as an important condition rupture, will cause great damage to cells and reduce success rate injection. To a certain extent, it has formed contradiction with rapid development modern biomedicine. this end, paper proposes micro-injection suitable based on...

Biological micro-dissection has a wide range of applications in the field molecular pathology. The current laser-assisted dissection technology is expensive, and laser radiation can lead to sample contamination. As an economical pollution-free method, piezoelectric ultrasonic application prospect. However, performance unsatisfactory. In this paper, novel device based on flexure mechanism proposed order solve problems low dissecting precision excessive wear needle caused by harmful lateral...

Zona pellucida thickness (ZPT) is one of the indexes to reflect quality oocyte and developmental potentiality embryo. In order avoid error manual measurement, inverted microscope image used measure ZPT oocyte. The automatic measurement helpful realize filtering oocytes in artificial assisted reproductive technology (ART) nuclear transplantation technique (NTT). this paper, a method that based on coordinate transformation for detection inner outer boundary zona pellucida. On basis, ellipse...

According to the problem that center frequency of signal is not accurate, result inaccuracy. In view this situation, principle measuring range and velocity target using FMCW radars studied, then beat processed improve accuracy estimation. This paper uses window function for filtering in order reduce effect leakage fence effect; FFT used find out rough location frequency; finally one-dimensional Gauss refine spectrum get estimated frequency. Matlab simulation. Compared with different methods,...