An investigation into the postbuckling and geometrically nonlinear behaviors of functionally graded carbon nanotube-reinforced composite (FG-CNTRC) shells is carried out in this study. The discrete ...nonlinear equation system is established based on non-uniform rational B-Spline (NURBS) basis functions and the first-order shear deformation shell theory (FSDT). The nonlinearity of shells is formed in the Total Lagrangian approach considering the von Karman assumption. The incremental solutions are obtained by using a modified Riks method. In the present formulation, the rule of mixture is used to estimate the effective material properties of FG-CNTRC shells. Effects of CNTs distribution, volume fraction and CNTs orientation on the postbuckling behavior of FG-CNTRC shells are particularly investigated. Exact geometries of shells are modeled by using NURBS interpolation. Several verifications are given to show the high reliability of the proposed formulation. Especially, some complex postbuckling curves of FG-CNTRC panels and cylinders are first provided that could be useful for future references.
•NURBS-based postbuckling analysis of functionally graded carbon nanotube-reinforced composite shells is performed in this paper.•The discrete nonlinear equation system is established based on non-uniform rational B-Spline (NURBS) basis functions and the first-order shear deformation shell theory (FSDT).•The nonlinearity of shells is formed in the Total Lagrangian approach considering the von Karman assumption.•Effects of CNTs distribution, volume fraction and CNTs orientation on the postbuckling behavior of FG-CNTRC shells are particularly investigated.•Some complex postbuckling curves of FG-CNTRC panels and cylinders are first provided that could be useful for future references.
The choice of sensitivity analysis methods for a model often relies on the behavior of model outputs. However, many building energy models are “black-box” functions whose behavior of simulated ...results is usually unknown or uncertain. This situation raises a question of how to correctly choose a sensitivity analysis method and its settings for building simulation. A performance comparison of nine sensitivity analysis methods has been carried out by means of computational experiments and building energy simulation. A comprehensive test procedure using three benchmark functions and two real-world building energy models was proposed. The degree of complexity was gradually increased by carefully-chosen test problems. Performance of these methods was compared through the ranking of variables’ importance, variables’ sensitivity indices, interaction among variables, and computational cost for each method. Test results show the consistency between the Fourier Amplitude Sensitivity Test (FAST) and the Sobol method. Some evidences found from the tests indicate that performance of other methods was unstable, especially with the non-monotonic test problems.
Point-of-interest (POI) recommendation is an important service to Location-Based Social Networks (LBSNs) that can benefit both users and businesses. In recent years, a number of POI recommender ...systems have been proposed, but there is still a lack of systematical comparison thereof. In this paper, we provide an all-around evaluation of 12 state-of-the-art POI recommendation models. From the evaluation, we obtain several important findings, based on which we can better understand and utilize POI recommendation models in various scenarios. We anticipate this work to provide readers with an overall picture of the cutting-edge research on POI recommendation.
The threat of environmental pollution caused by spilled oil is rapidly increasing along with the expansion of oil exploration, the development of maritime activities and industrial growth. Oil spill ...incidents usually affect seriously the ecosystem and human life. Therefore, the treatment and recovery of the oil spill have been considered as an ultra-important issue to protect the environment and to minimize its negative impacts on socio-economic activities. Among methods of oil spill recovery, porous materials have emerged as potential absorbents possessing the capacity of absorbing spilled oil at a fast rate, high adsorption capacity, good selectivity, and high reusability. In this review paper, two types of polymer-based porous absorbents modified surface and structure were introduced for the treatment strategy of the oil-polluted water. In addition, the absorption mechanism and factors affecting the adsorption capacity for oils and organic solvents were thoroughly analyzed. More importantly, characteristics of polymer-based porous materials were discussed in detail based on microstructure analysis, absorption efficiency, and reusability. In general, this paper has provided an overview and a comprehensive assessment of the use of advanced polymer-based porous materials for the treatment of oil-polluted water, although the impacts of environmental factors such as wind, wave, and temperature should be further investigated in the future.
•The absorption mechanism for porous material was thoroughly analyzed.•Characteristics of modified polymer-based porous materials were evaluated.•The absorption capacity of polymer-based porous materials was discussed in detail.•Future orientation for porous absorbents with high performance was mentioned.
African swine fever virus (ASFV) genotype II is endemic to Vietnam. We detected recombinant ASFV genotypes I and II (rASFV I/II) strains in domestic pigs from 6 northern provinces in Vietnam. The ...introduction of rASFV I/II strains could complicate ongoing ASFV control measures in the region.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, ODKLJ, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
When the vehicle is traveling at high speed and suddenly steers, a rollover phenomenon may occur. The main cause of this phenomenon is the appearance of a centrifugal force, which is proportional to ...the mass and the square of the velocity. In order to limit this situation, the method of using the hydraulic stabilizer bar (active stabilizer bar) has been proposed. The performance of the hydraulic stabilizer bar is highly dependent on the control method, which has been designed to ensure the stabilizer bar's operation. Previous research often only used simple dynamics models and conventional linear control methods. Therefore, the performance of the stabilizer bar is not guaranteed. At the same time, the factors affecting the movement of a vehicle are not mentioned. This will cause inaccuracies. This research used a spatial dynamics model combined with a non-linear double-track dynamics model, which fully describes the effects of vehicle oscillations. Besides, the two-input Fuzzy control method is also proposed. This is a completely novel model, and it is not like the previous models that have been used to study the stabilizer bar. The results of this research show that if the vehicle uses the hydraulic stabilizer bar controlled by a two-input Fuzzy controller, the values of the roll angle and roll index have been reduced. As a result, stability and safety have been significantly improved. The achievements of this research will be the basis for the development of other intelligent control methods in the future.
This paper describes the route, from simulations toward experiments, for optimizing the magnetoelectric (ME) geometries for vortex magnetic field sensors. The research is performed on the base of the ...Metglas/Piezoelectric (PZT) laminates in both open and closed magnetic circuit (OMC and CMC) geometries with different widths (
), lengths (
), and diameters (
). Among these geometries, the CMC laminates demonstrate advantages not only in their magnetic flux distribution, but also in their sensitivity and in their independence of the position of the vortex center. In addition, the ME voltage signal is found to be enhanced by increasing the magnetostrictive volume fraction. Optimal issues are incorporated to realize a CMC-based ME double sandwich current sensor in the ring shape with
×
= 6 mm × 1.5 mm and four layers of Metglas. At the resonant frequency of 174.4 kHz, this sensor exhibits the record sensitivity of 5.426 V/A as compared to variety of devices such as the CMC ME sensor family, fluxgate, magnetoresistive, and Hall-effect-based devices. It opens a potential to commercialize a new generation of ME-based current and (or) vortex magnetic sensors.
Abstract
The genetic code of mammalian cells can be expanded to allow the incorporation of non-canonical amino acids (ncAAs) by suppressing in-frame amber stop codons (UAG) with an orthogonal ...pyrrolysyl-tRNA synthetase (PylRS)/tRNAPylCUA (PylT) pair. However, the feasibility of this approach is substantially hampered by unpredictable variations in incorporation efficiencies at different stop codon positions within target proteins. Here, we apply a proteomics-based approach to quantify ncAA incorporation rates at hundreds of endogenous amber stop codons in mammalian cells. With these data, we compute iPASS (Identification of Permissive Amber Sites for Suppression; available at www.bultmannlab.eu/tools/iPASS), a linear regression model to predict relative ncAA incorporation efficiencies depending on the surrounding sequence context. To verify iPASS, we develop a dual-fluorescence reporter for high-throughput flow-cytometry analysis that reproducibly yields context-specific ncAA incorporation efficiencies. We show that nucleotides up- and downstream of UAG synergistically influence ncAA incorporation efficiency independent of cell line and ncAA identity. Additionally, we demonstrate iPASS-guided optimization of ncAA incorporation rates by synonymous exchange of codons flanking the amber stop codon. This combination of in silico analysis followed by validation in living mammalian cells substantially simplifies identification as well as adaptation of sites within a target protein to confer high ncAA incorporation rates.
Graphical Abstract
Graphical Abstract
Pipeline to identify or optimize and subsequently validate favorable amber stop codon sequence contexts with high non-canonical amino acid (ncAA) incorporation efficiencies.
Titanium dioxide (TiO
2
) nanomaterials have been comprehensively studied in recent decades because of their possible practical applications in diverse fields, including photocatalysis, energy ...storage, sensing and biomedicine. Numerous strategies have been reported on preparing TiO
2
nanostructures with regulated sizes, shapes and surface ligands; however, developing a simple, eco-friendly, cost-effective and scalable procedure for the fabrication of TiO
2
nanomaterials while controlling those properties is still challenging. Herein, titanium dioxide nanostructures, e-TiO
2
, are prepared using a scalable green electrochemical approach, in which Ti foils act as precursors. Electrolysis is carried out in an electrolyte solution containing only a surfactant in water. This approach reduces the use of toxic chemicals, and thus it is eco-friendly and cost-effective. Moreover, the electrochemical synthesis of colloidal e-TiO
2
can be successfully scaled up to 5 L. Three cationic surfactants, tetrapropylammonium bromide (TPAB), tetrabutylammonium bromide (TBAB) and cetyltrimethylammonium bromide (CTAB), are employed as electrolytes to fabricate e-TiO
2
, resulting in the formation of three types of nanostructures: negatively charged e-TiO
2
/TPAB nanospheres, negatively charged e-TiO
2
/TBAB nano-ellipses and positively charged e-TiO
2
/CTAB nanorods. They are characterized to clarify the roles of surfactants in controlling sizes, shape and surface properties of e-TiO
2
nanostructures. Dispersibility of three types of e-TiO
2
is investigated in aqueous and nonpolar solvents. e-TiO
2
/TPAB and e-TiO
2
/TBAB are only well-dispersed in aqueous media. In particular, e-TiO
2
/CTAB can be dissolved in both kinds of solvents. Thanks to the unique rotatable property of the coating agent (CTAB), a “smart” TiO
2
nanomaterial (e-TiO
2
/CTAB nanorod) has been fabricated, which can migrate from an aqueous medium to a nonpolar one and vice versa.
Graphical Abstract
•We report on how people live with floods in the Vietnamese Mekong Delta.•We extract lessons from the ecological wisdom in rural context for modern cities.•We propose three urban design principles ...for urban flood resilience based on the lessons.
Despite the widespread implementation of flood control infrastructure, modern cities around the world remain vulnerable to flood hazards. Although flood management has in general placed less emphasis on structural measures, urban flood hazard mitigation continues to fixate on the flood control paradigm, the ideology that flooding must be prevented in the first place, as flooding is assumed to be disastrous. To promote urban flood resilience, this paper argues for the alternative flood adaptation paradigm, which concerns preventing damage when flooding occurs and allows flooding to enter the city. The argument is grounded on our fieldworks on the ecological wisdom of living with floods in the Vietnamese Mekong Delta in two hamlets, Vinh An and Ha Bao, where flooding is mostly harmless and brings benefits. To turn this ecological wisdom of the rural hamlets into practical knowledge, we extract lessons for modern cities: Modern cities need ecological knowledge to nurture ecological wisdom; and need to become agile by developing localized flood-response capacity, striving for timely systemwide adjustment, and turning amphibious. To make these lessons of the ecological wisdom actionable, we translate them into three urban design principles: Urban design should (1) anticipate and accommodate flooding, (2) incorporate the ecological process of flooding, and (3) reveal the flood dynamics to the public.
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