通讯机构：
[Chao Ding] C;College of Food Science and Engineering/Collaborative Innovation Center for Modern Grain Circulation and Safety, Key Laboratory of Grains and Oils Quality Control and Processing, Nanjing University of Finance and Economics, No. 3 Wenyuan Road, Nanjing, Jiangsu, 210023, China
摘要：
Infrared radiation drying (IRD) is a novel technique that can effectively dry paddy rice and well maintain the milling yield and storage qualities. The objective of this research was to investigate the mechanism of IRD to improve the qualities of stored rice from the aspect of starch multi-scale structure. The rice flour functionality and multi-scale structure of rice starch treated by IRD and ambient air drying (AAD) during 8 months of storage were determined. Compared to AAD, IRD significantly increased the peak viscosity, final viscosity, gelatinization enthalpy, G' and G '' moduli of stored paddy rice flour (p < 0.05). IRD shows stabilization on rice starch multi-scale structure by improving the degree of short-range order structure, increasing the relative crystallinity in the range of 25.2%-26.8% and compacting the double helix in the crystalline regions. Fractures and aggregation were observed on the IRD-treated rice starch granules, which might cause the increase in pasting viscosities and gelatinization enthalpy. In addition, the functionality and multi-scale structure of IRD-treated rice starch showed slighter changes during storage. Therefore, IRD is an effective method to improve the rice flour functionality and storage stability by altering the multi-level structure of rice starch molecules.
摘要：
The phenomena of logical chaotic resonance (LCR) was demonstrated recently, namely, a chaos-driven bistable system can operate robustly as a specific logic gate in an optimal range of the intensity of chaotic driving force. Here we explore the possibility that let a chaos-driven bistable system operates directly as a latch (i.e. a basic building block of computers for storing information) by realizing chaos-induced Set- Reset latch operation. Numerical results show that reliable Set-Reset latch operation indeed exists in the chaos-driven bistable system if the intensity k of chaotic driving force is in an optimal range. Therefore, it is possible to realize chaos-assisted memory device according to LCR. Furthermore, the enhancement in broadening the optimal window of the intensity k , and in improving the response speed of the system can be implemented by introducing periodic driving force into the chaos-driven system. These results are further corroborated by circuit experiments. (c) 2021 Elsevier Ltd. All rights reserved.
通讯机构：
[Chen, M.; Peng, Y.] S;School of Mechanical Science and Engineering, China;School of Aerospace Engineering, China
关键词：
Light emitting diodes;Heating systems;Substrates;Cooling;Packaging;Thermal management;Heat sinks;Chip on thermoelectric cooler (chip-on-TEC);high-power light-emitting diode (LED);light output power;working temperature
摘要：
In this work, we proposed a chip on thermoelectric cooler (chip-on-TEC) for the active thermal management of high-power light-emitting diode (LED). The chip-on-TEC was prepared by electroplating a circuit layer on the cold-side substrate of thermoelectric cooling (TEC) and directly attaching LED chips on the circuit layer. Due to the Peltier effect of TE materials and the low thermal resistance of chip-on-TEC structure, the heat generated from the chips can be dissipated to the surrounding environment effectively. The performances of chip-on-TEC were studied by using the thermal simulation and packaging experiment. Compared with the traditional packaging structure, the working temperature of chip-on-TEC is greatly reduced under various chip currents. At the chip current of 1.0 A, the chip-on-TEC can reduce the working temperature from 232 degrees C to 114 degrees C (the reduction of 51%). Moreover, the light output power of LED is increased by 35.3%. The chip-on-TEC also can improve the light intensity and the light saturation point of LED. The results demonstrate that the chip-on-TEC is a promising thermal management for high-power LED packaging.
摘要：
Reverse engineering is a powerful tool for duplicating real objects from data acquired by tracking systems, industrial X-ray computed tomography (CT), laser scanners, and image captures. This work proposed a novel method using the three-dimensional (3D) reconstruction and 3D printing to duplicate a mechanical key based on only one single naturally-captured photograph. A reverse engineering system of the mechanical key was self-developed which includes functions of projective transformation, curve extraction, point clouds generation, and 3D geometry reconstruction. The database technology was introduced into the image-based 3D reconstruction process for the first time to store basic dimensional information of key blanks, which provided supplementary information during the 3D key reconstruction process. Five different types of duplicated keys verified the effectiveness of the proposed method. The maximum geometric deviation was less than 0.39 mm. The duplicating time cost was 5 minutes for 3D geometry reconstruction and 18.3 minutes for 3D printing.
摘要：
Multipartite nonlocality is an important measure of multipartite quantum correlations. In this paper, we show that the nonlocal n -site Mermin-Klyshko operator M̂n can be exactly expressed as a matrix product operator with a bond dimension D=2 , and then the calculation of nonlocality measure S can be simplified into standard one-dimensional (1D) tensor networks. With the help of this technique, we analyze finite-temperature multipartite nonlocality in several typical 1D spin chains, including an XX model, an XXZ model, and a Kitaev model. For the XX model and the XXZ model, in a finite-temperature region, the logarithm measure of nonlocality ( log2S ) is a linear function of the temperature T , i.e., log2S∼−aT+b . It provides us with an intuitive picture about how thermodynamic fluctuations destroy multipartite nonlocality in 1D quantum chains. Moreover, in the XX model S presents a magnetic-field-induced oscillation at low temperatures. This behavior has a nonlocal nature and cannot be captured by local properties such as the magnetization. Finally, for the Kitaev model, we find that in the limit T→0 and N→∞ the nonlocality measure may be used as an alternative order parameter for the topological-type quantum phase transition in the model.
摘要：
The multipartite nonlocality of finite and infinite transverse-field Ising model is investigated. For the finite chain, the exact diagonalization method is used to study the multipartite nonlocality at zero and finite temperatures. It is found that the logarithm of nonlocality S presents the linear relationship with the chain length of N at zero temperature. The multipartite nonlocality S shows a peak value near the phase transition point, which can be used to characterize the quantum phase transition of the Ising model. The inherent physical mechanics is that the nonlocality S captures the effect of low-lying states with a small energy gap. The nonlocality S at the finite temperature is also observed to be scaled as log(2) S approximate to aN + b at any fixed magnetic field B, where a and b are fitting parameters. For the infinite chain, the thermal tensor network algorithm is used to examine the multipartite nonlocality. The behaviors of nonlocality S of the infinite chain at the finite temperature are similar to those of finite chain. Compared with the finite chain, the positions of the peak values of the multipartite nonlocality shift to the larger magnetic field, and the peak values are smaller than those of finite chain.
通讯机构：
[Jian Xu] S;School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430023, China
关键词：
Thermoelectric legs;Thermal analysis;FEM simulation;Maximum temperature difference;Optimal current
摘要：
The maximum temperature difference, which is corresponding to the optimal current, is important for evaluating the performance of thermoelectric coolers (TECs). As a representative of the thermoelectric leg with non-constant cross-section, the pyramidal thermoelectric leg has more advantages than the traditional cuboidal thermoelectric leg due to the large temperature gradient. However, the fabrication is much complex. In this work, a new shaped thermoelectric leg for TECs with almost the same property with the pyramidal legs is proposed and a simple practical approach for fabrication by taking one-side cut from the cuboidal leg is presented. Optimal current improvement is demonstrated by the theoretical calculation and the finite element simulation as well as the test results.
摘要：
Hyperspectral technology is used to obtain spectral and spatial information of samples simultaneously and demonstrates significant potential for use in seed purity identification. However, it has certain limitations, such as high acquisition cost and massive redundant information. This study integrates the advantages of the sparse feature of the least absolute shrinkage and selection operator (LASSO) algorithm and the classification feature of the logistic regression model (LRM). We propose a hyperspectral rice seed purity identification method based on the LASSO logistic regression model (LLRM). The feasibility of using LLRM for the selection of feature wavelength bands and seed purity identification are discussed using four types of rice seeds as research objects. The results of 13 different adulteration cases revealed that the value of the regularisation parameter was different in each case. The recognition accuracy of LLRM and average recognition accuracy were 91.67-100% and 98.47%, respectively. Furthermore, the recognition accuracy of full-band LRM was 71.60-100%. However, the average recognition accuracy was merely 89.63%. These results indicate that LLRM can select the feature wavelength bands stably and improve the recognition accuracy of rice seeds, demonstrating the feasibility of developing a hyperspectral technology with LLRM for seed purity identification.
摘要：
For high-temperature-resolution microbolometric focal plane arrays, the required characteristic parameter of substrate temperature fluctuation suppression is analyzed and discussed. The microbolometric temperature response to the temperature change of an infrared imaging target is theoretically derived from the microbolometer physical models of infrared imaging and thermoelectric. Based on the theoretical temperature responsivity expression of the microbolometer, the substrate temperature fluctuation suppression precision for high-temperature-resolution microbolometric focal plane arrays is theoretically given out and discussed. According to the theoretical precision requirements of substrate temperature fluctuation suppression, the numerically calculated results of the required precision for the typical microbolometer are obtained. These analyses and discussions for the precision requirements of substrate temperature fluctuation suppression are theoretically strict and numerically accurate, and the achieved precision requirements of substrate temperature fluctuation suppression can be guidable to the design of temperature control circuits for high-temperature-resolution microbolometric focal plane arrays, which has been successfully used in high resolution infrared imaging systems in our laboratory.
摘要：
For high-performance microbolometric focal plane array, a pair of mutually restricted microbolometer performance parameters are analyzed and discussed. The main parameters optimization contradiction is between the microbolometric infrared signal to noise ratio and signal bandwidth, and these two performance characteristics parameters are decisive to the target-temperature resolution and imaging speed of the microbolometric focal plane array respectively. The microbolometric output signal to noise ratio of unit-power infrared signal and signal bandwidth are theoretically derived from the thermal balance equation of the typical microbolometer, and some vital factors to cause the optimization contradiction between them are revealed through theoretical analyses and numerical calculations. The microbolometer parameters optimization method based on these theoretical analyses and numerical calculations is pointed out, which can be guidable to design, fabricate and operate microbolometric focal plane arrays with high-performance characteristic parameters such as high temperature resolution and infrared image speed.
摘要：
Monte Carlo (MC) method is often adopted to calculate the DC conductivity of nanocomposites with straight-line carbon nanotubes (CNT), but calculations for the frequency-dependent AC conductivity and dielectric properties with curved CNTs are rare. The difficulties lie in the geometrical modeling of curved CNTs and the determination of electric potentials for thousands of CNTs and thousands of random points on the coated surface around each CNT. In this paper, a three-dimensional curved CNT network is established based on random third-order Be acute accent zier curves. By calculating the distance between the curves through a culling approach, the MC method is developed to calculate the complex conductivity under an AC field. Curved CNTs were divided into three groups according to the maximum curvature and compared with straight-line CNTs. The results show that both conductivity and dielectric constant can notably decrease with the bending degree of Be acute accent zier curves, and the percolation threshold can increase by about 20% as compared to that with straight-line CNTs. The frequency effects of complex conductivity are also assessed, and found to depend on the diameter of CNTs, barrier height, and the complex conductivity of polymer matrix as well. Several other new features of the theory are also highlighted.
通讯机构：
[Rong Gui] D;Department of Physics, College of Science, Huazhong Agricultural University , Wuhan 430070, China
摘要：
The essence of logical stochastic resonance is the dynamic manipulation of potential wells. The effect of time delay on the depth of potential wells and the width of a bistable region can be inferred by logic operations in the bistable system with time delay. In a time-delayed synthetic gene network, time delay in the synthesis process can increase the depth of the potential wells, while that in the degradation process, it can reduce the depth of the potential wells, which will result in a decrease in the width of the bistable region (the reason for time delay to induce logic operations without external driving force) and the instability of the system (oscillation). These two opposite effects imply stretching and folding, leading to complex dynamical behaviors of the system, including period, chaos, bubble, chaotic bubble, forward and reverse period doubling bifurcation, intermittency, and coexisting attractors.
关键词：
gravitational waves;stars: neutron;stars: oscillations;quasars: general
摘要：
Gamma-ray bursts (GRBs) have long been proposed as a complementary probe to type Ia supernovae (SNe Ia) and the cosmic microwave background to explore the expansion history of the high-redshift universe, mainly because they are bright enough to be detected at greater distances. Although they lack definite physical explanations, many empirical correlations between GRB isotropic energy or luminosity and some directly detectable spectral or temporal properties have been proposed to make GRBs standard candles. Since the observed GRB rate falls off rapidly at low redshifts, this thus prevents a cosmology independent calibration of these correlations. In order to avoid the circularity problem, SN Ia data are usually used to calibrate the luminosity relations of GRBs in the low redshift region (limited by the redshift range for SN Ia sample), and then they are extrapolate the luminosity relations to the high redshift region. This approach is based on the assumption of no redshift evolution for GRB luminosity relations. In this work, we suggest the use of a complete quasar sample in the redshift range of 0.5 < <i>z<i/> < 5.5 to test such an assumption. We divided the quasar sample into several subsamples with different redshift bins, and used each subsample to calibrate the isotropic <i>γ<i/>-ray equivalent energy of GRBs in relevant redshift bins. By fitting the newly calibrated data, we find strong evidence that the most commonly used Amati relation between spectral peak energy and isotropic-equivalent radiated energy shows no, or marginal, evolution with redshift. Indeed, at different redshifts, the coefficients in the Amati relation could have a maximum variation of 0.93% at different redshifts, and there could be no coincidence in the range of 1<i>σ<i/>.
作者：
Zhao, Yue;Peng, Jiangtao;Wei, Yantao;Peng, Qinmu;Mou, Yi
期刊：
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS,2021年18(10):1836-1840 ISSN：1545-598X
通讯作者：
Peng, J.
作者机构：
[Zhao, Yue] Hubei Univ, Sch Comp Sci & Informat Engn, Wuhan 430062, Peoples R China.;[Peng, Jiangtao] Hubei Univ, Fac Math & Stat, Hubei Key Lab Appl Math, Wuhan 430062, Peoples R China.;[Wei, Yantao] Cent China Normal Univ, Sch Educ Informat Technol, Wuhan 430079, Peoples R China.;[Peng, Qinmu] Huazhong Univ Sci & Technol, Sch Elect Informat & Commun, Wuhan 430074, Peoples R China.;[Mou, Yi] Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430023, Peoples R China.
通讯机构：
[Peng, J.] H;Hubei Key Laboratory of Applied Mathematics, China
关键词：
Feature extraction;Training;Hyperspectral imaging;Learning systems;Computational complexity;Electronic mail;Hyperspectral image (HSI) classification;multiple-feature latent space (MFLS) learning;spatial information
摘要：
Considering that multiple features can improve the classification performance as they contain diversity information of images, a multiple-feature latent space learning-based method is proposed for hyperspectral image (HSI) classification in this letter. In the proposed method, a latent space that contains diversity information of multiple features and transformation matrices between the latent space and features are both learned. Moreover, spatial information is used for labeling unlabeled samples in the classification. Experimental results on the Indian Pines and University of Pavia data sets demonstrate the effectiveness of the proposed method.
摘要：
Enhancement and denoising are a pair of inverse problems in image processing, how to enhance vascular as well as reducing noise with structure preservation from X-ray angiographic images is important for clinicians to diagnose vascular diseases. In order to complete the task, this paper has proposed a non-local Hessian-based filter (NLHF) including the following key parts: (1) a non-local operator is incorporated into the Hessian matrix to obtain noiseless eigenvalues in a noisy environment. (2) The relation of local image is carried by an exponent function which is used to suppress non-vascular structures around real vascular structures. The quantitative and qualitative results of experiments on both synthetic and real-world clinical X-ray vascular angiograms demonstrate that the proposed NLHF method performs better than the other two Hessian-based methods on vascular enhancement, noise reduction, and structure preservation.
作者：
Li, Xiaolei;Keeley, Ryan E.;Shafieloo, Arman;Zheng, Xiaogang;Cao, Shuo;...
期刊：
Monthly Notices of the Royal Astronomical Society,2021年507(1):919-926 ISSN：0035-8711
通讯作者：
Xiaolei Li<&wdkj&>Ryan E Keeley<&wdkj&>Arman Shafieloo
作者机构：
[Li, Xiaolei] Hebei Normal Univ, Coll Phys, Shijiazhuang 050024, Hebei, Peoples R China.;[Keeley, Ryan E.; Shafieloo, Arman] Korea Astron & Space Sci Inst, Daejeon 34055, South Korea.;[Shafieloo, Arman] Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea.;[Zheng, Xiaogang] Wuhan Polytech Univ, Sch Elect & Elect Engn, Wuhan 430023, Peoples R China.;[Biesiada, Marek; Cao, Shuo; Zhu, Zong-Hong] Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China.
通讯机构：
[Xiaolei Li] C;[Ryan E Keeley; Arman Shafieloo] K;Korea Astronomy and Space Science Institute , Daejeon 34055, Korea<&wdkj&>Korea Astronomy and Space Science Institute , Daejeon 34055, Korea<&wdkj&>University of Science and Technology , Yuseong-gu 217 Gajeong-ro, Daejeon 34113, Korea<&wdkj&>College of Physics, Hebei Normal University , Shijiazhuang 050024, China
摘要：
In this paper, we present a model-independent approach to calibrate the largest quasar sample. Calibrating quasar samples is essentially constraining the parameters of the linear relation between the log of the ultraviolet (UV) and X-ray luminosities. This calibration allows quasars to be used as standardized candles. There is a strong correlation between the parameters characterizing the quasar luminosity relation and the cosmological distances inferred from using quasars as standardized candles. We break this degeneracy by using Gaussian process regression to model-independently reconstruct the expansion history of the Universe from the latest type Ia supernova observations. Using the calibrated quasar data set, we further reconstruct the expansion history up to redshift of z ∼ 7.5. Finally, we test the consistency between the calibrated quasar sample and the standard Lambda cold dark matter (|$\rm {\Lambda }CDM$|) model based on the posterior probability distribution of the GP hyperparameters. Our results show that the quasar sample is in good agreement with the standard |$\rm {\Lambda }CDM$| model in the redshift range of the supernova, despite the 2−3σ significant deviations taking place at higher redshifts. Fitting the standard |$\rm {\Lambda }CDM$| model to the calibrated quasar sample, we obtain a high value of the matter density parameter |$\Omega _m = 0.382^{+0.045}_{-0.042}$|, which is marginally consistent with the constraints from other cosmological observations.
通讯机构：
[Shuo Cao] D;Department of Astronomy, Beijing Normal University, Beijing, China
关键词：
dark energy experiments;dark energy theory;quasars
摘要：
Recently, two classes of quasar samples were identified, which are promising as new cosmological probes extending to higher redshifts. The first sample uses the nonlinear relation between the ultraviolet and X-ray luminosities of quasars to derive luminosity distances, whereas the linear sizes of compact radio quasars in the second sample can serve as standardized rulers, providing angular-diameter distances. In this study, under the assumption of a flat universe, we refreshed the calibration of multiple measurements of high-redshift quasars (in the framework of a cosmological-model-independent method with the newest Hubble parameters data). Furthermore, we placed constraints on four models that characterize the cosmic equation of state (w). The obtained results show that: (1) the two quasar samples could provide promising complementary probes at much higher redshifts, whereas compact radio quasars perform better than ultraviolet and X-ray quasars at the current observational level; (2) strong degeneracy between the cosmic equation of state (w) and Hubble constant (H0) is revealed, which highlights the importance of independent determination of H0 from time-delay measurements of strongly lensed quasars; (3) together with other standard ruler probes, such as baryon acoustic oscillation distance measurements, the combined QSO+BAO measurements are consistent with the standard ΛCDM model at a constant equation of state w = −1; (4) ranking the cosmological models, the polynomial parametrization gives a rather good fit among the four cosmic-equation-of-state models, whereas the Jassal-Bagla-Padmanabhan (JBP) parametrization is substantially penalized by the Akaike Information Criterion and Bayesian Information Criterion.
通讯机构：
[Yun Mou; Jian Xu] S;School of Electrical and Electronic Engineering, Wuhan Polytechnic University, Wuhan 430023, China<&wdkj&>School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
