作者机构：
[Mo, Weinan; Li, Ling; Cao, Ying] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Peoples R China.;[Mo, Weinan; Sun, Zhexing; Cao, Ying] Kunming Univ Sci & Technol, Fac Modern Agr Engn, Kunming 650500, Yunnan, Peoples R China.
通讯机构：
[Ling Li] C;College of Mechanical and Electrical Engineering, Central South University of Forestry and Technology, Changsha 410004, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
With the rise of mobile social networks, an increasing number of consumers are shopping through Internet platforms. The information asymmetry between consumers and producers has caused producers to misjudge the positioning of agricultural products in the market and damaged the interests of consumers. This imbalance between supply and demand is detrimental to the development of the agricultural market. Sentiment tendency analysis of after-sale reviews of agricultural products on the Internet could effectively help consumers evaluate the quality of agricultural products and help enterprises optimize and upgrade their products. Targeting problems such as non-standard expressions and sparse features in agricultural product reviews, this paper proposes a sentiment analysis algorithm based on an improved Bidirectional Encoder Representations from Transformers (BERT) model with symmetrical structure to obtain sentence-level feature vectors of agricultural product evaluations containing complete semantic information. Specifically, we propose a recognition method based on speech rules to identify the emotional tendencies of consumers when evaluating agricultural products and extract consumer demand for agricultural product attributes from online reviews. Our results showed that the F1 value of the trained model reached 89.86% on the test set, which is an increase of 7.05 compared with that of the original BERT model. The agricultural evaluation classification algorithm proposed in this paper could efficiently determine the emotion expressed by the text, which helps to further analyze network evaluation data, extract effective information, and realize the visualization of emotion.
摘要：
A highly sensitive strain sensor based on a photonic crystal fiber (PCF) Mach-Zehnder interferometer (MZI) was proposed. The MZI was formed by splicing two sections of no-core fibers (NCFs) with a piece of PCF between two single-mode fibers. The sensor has exhibited high fringe visibility of up to 22 dB in air and high strain sensitivity of 2.09 pm mu epsilon (-1) in the range of 0 similar to 2973 mu epsilon. The strain characteristics of the sensor with different lengths of PCF were also investigated. Moreover, a wavelength hysteresis of less than 0.2 nm and temperature sensitivity of 11.28 pm degrees C-1 were measured. Additionally, the sensor has the advantages of easy fabrication, larger strain measurement, high extinction ratio, and high resolution, which shows great potential in the field of strain measurement.
通讯机构：
[Wang, Rongji] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
back propagation artificial neural network;injection molding process;process parameters;warpage
摘要：
A back propagation artificial neural network (BPANN) prediction model for warpage of injection-molded polypropylene was developed based on an orthogonal design method. The BPANN model was trained by the input and output data obtained from the moldflow software platform simulations. It is proved that the BPANN model can predict the warpage with reasonable accuracy. Utilizing the BPANN model, the effects of the process parameters, packing pressure (Pp), melt temperature (Tme), mold temperature (Tmo), packing time (tp), cooling time (tc), and fill pressure (pf), on the warpage were investigated. The most important process parameter affecting the warpage was Pp, and the second most important was Tme. The rest of the process parameters, Tmo, tp, tc, and pf, were found to be relatively less influential. Warpage increased with elevating Tmo. In contrast, an increase in Pp and Tme caused the warpage to decrease.
通讯机构：
[Li, Luoxing] H;Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.
关键词：
Aluminum alloy;Interfacial heat transfer;Nucleation site density;Spray pressure;Spray quenching;Surface roughness
摘要：
The heat flux (q) and heat transfer coefficient (h) at the interface between hot aluminum surface and spray water were determined by using an inverse heat conduction method. Good agreements between numerically calculated temperatures with the inverse identified h and experimentally measurements demonstrate that the method is valid for solving the q and h of spray quenching process. The estimated heat flux consists of three main stages of transition boiling, nucleate boiling and single-phase cooling. The results show that both the heat flux and heat transfer coefficient increase with the increasing of spray pressure. When the surface temperature is lower than 170 °C, the q, h and the maximum heat transfer coefficient (hmax) decrease and then increase as surface roughness increases. However, when the surface temperature is higher than 170 °C, the influence of surface is insignificant. This phenomenon may be attributed to the variation of nucleation site density with surface roughness.
期刊：
Advance Journal of Food Science and Technology,2014年6(1):130-134 ISSN：2042-4868
通讯作者：
Li, L.
作者机构：
[Lijun Li; Ye Xue; Jian Zhou] Machinery and Electrical Engineering College, Centre South University of Forestry Science and Technology, Changsha, 410004, China
通讯机构：
[Li, L.] M;Machinery and Electrical Engineering College, Centre South University of Forestry Science and Technology, China
期刊：
Heat and Mass Transfer,2013年49(8):1071-1080 ISSN：0947-7411
通讯作者：
Zhang, Liqiang
作者机构：
[Zhang, Liqiang] Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.;[Zhang, Liqiang; Li, Luoxing] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Zhang, Liqiang] C;Cent South Univ Forestry & Technol, Coll Mech & Elect Engn, Changsha 410004, Hunan, Peoples R China.
关键词：
Heat Flux;Heat Conduction Model;Interfacial Heat Transfer Coefficient;Inverse Algorithm;Tolerance Criterion
摘要：
The present work focuses on the determination of interfacial heat transfer coefficients (IHTCs) between the casting and metal chill during casting solidification. The proposed method is established based on the least-squares technique and sequential function specification method and can be applied to calculate heat fluxes and IHTCs for other alloys. The accuracy and stability of the method has been investigated by using a typical profile of heat fluxes simulating the practical conditions of casting solidification. In the test process, the effects of various calculation parameters in the inverse algorithm are also analyzed. Moreover, numerically calculated and experimental results are compared by applying the determined IHTCs into the forward heat conduction model with the same boundary conditions. The results show that the numerically calculated temperatures are in good agreement with those measured experimentally. This confirms that the proposed method is a feasible and effective tool for determination of the casting-mold IHTCs.
作者机构：
[Zhou, Jian; Li, Lijun] Ctr South Univ Forestry & Technol, Machinery & Elect Engn Coll, Changsha 410004, Hunan, Peoples R China.;[Cheng, Ke; Hu, Yihua] Guangxi Univ Technol, Lushan Coll, Liuzhou 545006, Peoples R China.;[Yang, Jianguo] Zhuzhou Gear CO LTD, Zhuzhou 412000, Peoples R China.
通讯机构：
[Zhou, Jian] C;Ctr South Univ Forestry & Technol, Machinery & Elect Engn Coll, Changsha 410004, Hunan, Peoples R China.
会议名称：
International Conference on Advanced in Control Engineering and Information Science (CEIS)
会议时间：
AUG 18-19, 2011
会议地点：
Dali, PEOPLES R CHINA
会议主办单位：
[Zhou, Jian;Li, Lijun] Ctr South Univ Forestry & Technol, Machinery & Elect Engn Coll, Changsha 410004, Hunan, Peoples R China.^[Hu, Yihua;Cheng, Ke] Guangxi Univ Technol, Lushan Coll, Liuzhou 545006, Peoples R China.^[Yang, Jianguo] Zhuzhou Gear CO LTD, Zhuzhou 412000, Peoples R China.
会议论文集名称：
Procedia Engineering
关键词：
Plastic mold;Pro/E;Design
摘要：
The article analysis the product construction and manufacturing technology,aso points out the parting surface design, the cavity mold design and the punch mold design, calculating deformation parts working size, drawing of assembly and parts' graphes, manufacturing process of plastic mold. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]
摘要：
As one of the chinese special product, it is very important for further machining of camellia oleifera fruit. The paper points out the fruit volume and density distribution, the specific heat capacity is about 2.1 similar to 2.5J/g degrees C. Under the microwave effect, the relation of critical fracture strength factor to rigidity has been calculated K-1c(2)= (1.1 similar to 9.8) *10(3)E. Practice and theory show that natural shape results the cracks locating the most raised parts of camellia oleifera fruit; Because the fibrous structure is the most weakness, the first cracking point is the fruit natural bottom. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [CEIS 2011]
