Providing Informative Nutrition Facts for Food Ordering

Online food ordering services provide little to no information regarding nutritional facts. This makes it difficult for customers to make decisions based on their nutrition and health needs. This disclosure describes an online food ordering service that provides users the nutritional facts of a food item prior to order placement. The information is provided via a suitable user interface of a website or app that enables the user to drill down further to obtain more granular information. If the user permits, prior orders of the users are used to provide periodic feedback regarding eating behavior and nutritional intake

Data - Driven Prediction of Corrosion Rate of 3C Steel in Marine Environment

For predicting the corrosion rate of 3C steel quickly and accurately,a support vector regression (RBF-SVR) model based on Gaussian kernel function and an ensemble model based on three models were developed using the data obtained from literatures.The RBF-SVR model was established after dimension reduction of the data set realized respectively through the SVR-based genetic algorithm,forward algorithm and backward algorithm,and after optimizing super-parameter using leave-one-out cross validation method and grid search.Finally,the obtained model and two other models from published literatures (GA-BPNN model and BPNN model with four layers) were integrated to form an ensemble model.The research results indicated that the ensemble model had higher prediction accuracy and generalization ability

A Comparative Study of Three Types Shear Mode Piezoelectric Wafers in Shear Horizontal Wave Generation and Reception

Guided wave-based inspection has emerged as a promising tool to evaluate the reliability of key components in modern industries. The fundamental shear horizontal (SH0) wave is always of great interests for plate-like structures because of its non-dispersion characteristics. However, the generation and reception of SH0 wave using piezoelectric wafers is not straightforward. In this paper, we firstly define three types shear mode piezoelectric wafers, i.e., the conventional in-plane poled thickness-shear (d15) mode, the thickness-poled thickness-shear (d15) mode, and the face-shear (d24) mode. Then, finite element simulations were conducted to demonstrate their performance in SH wave generation and reception. The results indicated that the face shear d24 wafer can generate almost single mode SH0 wave, while both types of d15 wafers would generate Lamb waves and SH0 wave simultaneously. Finally, experiments were carried out to check the efficiency of different shear mode piezoelectric wafers in SH0 wave generation and reception. The results indicated that the d24 wafer can generate and receive SH0 wave of high signal to noise ratio (SNR) with high energy conversion efficiency, while the in-plane poled d15 wafer would generate SH0 wave of high amplitude and acceptable SNR but with relatively low energy conversion efficiency. The performances of thickness-poled d15 wafer was not as good as the other two in both SH wave generation and reception. This work will be helpful for the applications of SH waves in plate-like structures

Steering and focusing of fundamental shear horizontal guided waves in plates by using multiple-strip metasurfaces

We proposed a metasurface consisting of multiple parallel strips with varied widths which can steer and focus the fundamental shear horizontal (SH0) wave in plates. Firstly, the group velocity of the quasi-SH0 wave in different-width strips was calculated. Then, a multiple-strip metasurface was designed which was realized by through-thickness grooving in an aluminum plate. Finite-element simulations show that this metasurface can steer the SH0 wave to a prescribed angle. Later, experiments were conducted in which thickness-shear (d15) piezoelectric strips were used as SH0 wave exciters and receivers, and experimental results well reproduced the simulation results. Finally, another multiple-strip metasurface was designed to focus the SH0 wave at a designated point. Both simulations and experiments were conducted, and results validated the proposed design. This work may provide guidance for the design of SH wave metasurfaces

Layer-by-Layer Heterostructure of MnO2@Reduced Graphene Oxide Composites as High-Performance Electrodes for Supercapacitors

In this paper, δ-MnO2 with layered structure was prepared by a facile liquid phase method, and exfoliated MnO2 nanosheet (e-MnO2) was obtained by ultrasonic exfoliation, whose surface was negatively charged. Then, positive charges were grafted on the surface of MnO2 nanosheets with a polycation electrolyte of polydiallyl dimethylammonium chloride (PDDA) in different concentrations. A series of e-MnO2@reduced graphene oxide (rGO) composites were obtained by electrostatic self-assembly combined with hydrothermal chemical reduction. When PDDA was adjusted to 0.75 g/L, the thickness of e-MnO2 was ~1.2 nm, and the nanosheets were uniformly adsorbed on the surface of graphene, which shows layer-by-layer morphology with a specific surface area of ~154 m2/g. On account of the unique heterostructure, the composite exhibits good electrochemical performance as supercapacitor electrodes. The specific capacitance of e-MnO2-0.75@rGO can reach 456 F/g at a current density of 1 A/g in KOH electrolyte, which still remains 201 F/g at 10 A/g. In addition, the capacitance retention is 98.7% after 10000 charge-discharge cycles at 20 A/g. Furthermore, an asymmetric supercapacitor (ASC) device of e-MnO2-0.75@rGO//graphene hydrogel (GH) was assembled, of which the specific capacitance achieves 94 F/g (1 A/g) and the cycle stability is excellent, with a retention rate of 99.3% over 10000 cycles (20 A/g)

An Ethylene-inhibited NF-YC Transcription Factor RhNF-YC9 Regulates Petal Expansion in Rose

The speed of flower opening is closely related to their ornamental period. Ethylene functions as a negative regulator involved in the regulation of the petal expansion process. In this study, we isolated a NF-YC transcription factor gene, RhNF-YC9, from rose petals. RhNF-YC9 expression was induced at the early stages of flower opening but was inhibited by ethylene treatment. Silencing RhNF-YC9 decreased the speed of petal expansion from stage 2 to stage 5. The expressions of 11 cell expansion-related genes involved in cell wall loosening, cell turgor modulation, and cytoskeleton remodeling were significantly down-regulated in RhNF-YC9-silenced petals. We also found that silencing RhNF-YC9 decreased the expression of gibberellin acid (GA) biosynthetic gene RhGA20ox while significantly increasing the transcripts of GA catabolic gene RhGA2ox, reducing the accumulation of GA4 and GA7. The influence of ethylene treatment on the expression of RhGA20ox and RhGA2ox showed the same trend. These results together suggested that RhNF-YC9 positively regulated the speed of petal expansion and mediated the crosstalk between ethylene and GA. Our findings revealed a new insight into the function of NF-YC transcription factors involved in ethylene-regulated petal expansion