Graftâ Free Maxillary Sinus Floor Elevation: A Systematic Review and Metaâ Analysis

Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/141088/1/jper0550.pd

AliCG: Fine-grained and Evolvable Conceptual Graph Construction for Semantic Search at Alibaba

Conceptual graphs, which is a particular type of Knowledge Graphs, play an essential role in semantic search. Prior conceptual graph construction approaches typically extract high-frequent, coarse-grained, and time-invariant concepts from formal texts. In real applications, however, it is necessary to extract less-frequent, fine-grained, and time-varying conceptual knowledge and build taxonomy in an evolving manner. In this paper, we introduce an approach to implementing and deploying the conceptual graph at Alibaba. Specifically, We propose a framework called AliCG which is capable of a) extracting fine-grained concepts by a novel bootstrapping with alignment consensus approach, b) mining long-tail concepts with a novel low-resource phrase mining approach, c) updating the graph dynamically via a concept distribution estimation method based on implicit and explicit user behaviors. We have deployed the framework at Alibaba UC Browser. Extensive offline evaluation as well as online A/B testing demonstrate the efficacy of our approach.Comment: Accepted by KDD 2021 (Applied Data Science Track

Ground Movement Analysis Based on Stochastic Medium Theory

In order to calculate the ground movement induced by displacement piles driven into horizontal layered strata, an axisymmetric model was built and then the vertical and horizontal ground movement functions were deduced using stochastic medium theory. Results show that the vertical ground movement obeys normal distribution function, while the horizontal ground movement is an exponential function. Utilizing field measured data, parameters of these functions can be obtained by back analysis, and an example was employed to verify this model. Result shows that stochastic medium theory is suitable for calculating the ground movement in pile driving, and there is no need to consider the constitutive model of soil or contact between pile and soil. This method is applicable in practice

Numerical analysis on the thermal hydraulic performance of a composite porous vapor chamber with uniform radial grooves

Abstract(#br)Composite porous vapor chamber (CPVC) with good thermal performance in temperature uniformity and high heat-flux limit was recently developed, and its wick structure consisted of a condenser wick and an evaporator wick with uniform radial grooves. However, the underlying mass and heat transfer mechanisms of the CPVC are unclear, hindering its further development. A simplified numerical model is presented in this paper to study the thermal hydraulic performance of the CPVC. By analyzing of the thermal performance, liquid/vapor velocity and pressure distributions of the CPVC with the input heat flux of 6 × 10 5 –28 × 10 5 W/m 2 , the influence of the wick structures, the wick porosity configuration and the powder size on the thermal hydraulic performance of the CPVC is investigated. Results show that the wicks can provide radial multi-artery channels for liquid backflow and heat conductive passages for heat transfer. The wick porosity affects the performance of the CPVC more than the powder size does. To obtain better performance, the configuration of the evaporator wick porosity and the condenser wick porosity should make the maximum pressure drop in the wicks slightly less than the maximum capillary pressure. However, the optimal porosity configuration varies with the powder size. Larger powder size results into smaller optimal porosity, and vice versa. In addition, the wick porosities should be as close as possible to the lower bound of their range. To facilitate the fluid flowing through the multi-artery channels, the evaporator wick porosity should be slightly larger than the condenser wick porosity. The work is useful for optimizing CPVC

Medicated Nanofibers Fabricated Using NaCl Solutions as Shell Fluids in Modified Coaxial Electrospinning

The present study reports the fabrication of medicated nanofibers for potential colon-targeted drug delivery using modified coaxial electrospinning, in which salt (NaCl) solutions were exploited as shell fluids to facilitate the preparation processes. A homemade concentric spinneret with an indented core capillary was developed to conduct the coaxial processes. Optical observations and scanning electron microscopic results demonstrated that the shell-to-core fluid flow rate ratio was a key parameter, which exerted a significant influence on the electrospinning processes and could be exploited to control the fibers’ morphology and diameters. A scaling law of D=0.173F-0.531 (R2=0.9976) was built, by which the nanofibers’ sizes can be predicted and manipulated easily. X-ray diffraction and attenuated total reflected FTIR tests verified that the medicated nanofibers were essentially a polymeric nanocomposite and the guest drug diclofenac sodium (DS) had fine compatibility with the host polymer. All the drug was encapsulated in the filament-forming carrier. In vitro dissolution experiments demonstrated that the medicated nanofibers could free the drug in a neutral condition, suggesting potential colon-targeted drug delivery applications. Ex vivo tests demonstrated that the medicated fiber mats could enhance the transmembrane of DS. Based on coaxial electrospinning, a new strategy is successfully developed for creating medicated nanomaterials