bluuebunny/crossref_metadata_2025 huggingface dataset:
A degradable, broad-spectrum and resistance-resistant antimicrobial oligoguanidine as a disinfecting and therapeutic agent in aquaculture
Authors: Huang Guopu , Shen Hui , Chen Xianhui , Wu Tong , Chen Zhiyong , Chen Yajie , Song Junfeng , Cai Qingyun , Bai Yugang , Pu Huangsheng , Feng Xinxin
Published: May 2022

A degradable oligoguanidine-based antimicrobial peptidomimetic features a dual-selective mechanism of action targeting the bacterial membrane and DNA simultaneously, resulting in broad-spectrum antimicrobial activities and resistance-resistant nature.
Scandium-catalyzed stereoselective block and alternating copolymerization of diphenylphosphinostyrenes and isoprene
Authors: Fu Tingting , Jiang Lei , Sun Hanyang , Hou Zhaomin , Guo Fang
Published: May 2022

The coordination copolymerization of polar diphenylphosphinostyrenes and isoprene by (C5Me4SiMe3)Sc(CH2C6H4NMe2-o)2 afforded a new series of phosphine-functionalized alternating and block isoprene–styrene copolymers.
A novel fluorescent self-assembling material with gel properties: ion recognition and energy transfer
Authors: Ma Xinxian , Yue Jinlong , Qiao Bo , Wang Yipei , Gao Yang , Ren Tianqi , Tang Jiahong , Feng Enke , Li Zhenliang , Han Xinning
Published: May 2022

A novel fabrication strategy for preparing fluorescent materials has been proposed based on energy transfer system, which is composed of a supramolecular self-assembly complexes (DAF–Al3+, Donor) and a dye (Acridine yellow, Acceptor).
Fused carbazole–coumarin–ketone dyes: high performance and photobleachable photoinitiators in free radical photopolymerization for deep photocuring under visible LED light irradiation
Authors: Guo Xinyue , Mao Huanv , Bao Chunyan , Wan Decheng , Jin Ming
Published: May 2022

Fused carbazole–coumarin–ketones are photoinitiators with high efficiency, excellent photobleaching and low cytotoxicity in deep photocuring.
A hierarchical system of covalent and dual non-covalent crosslinks promotes the toughness and self-healing properties of polymer hydrogels
Authors: Lin Yinlei , Ou Zexian , Wang Shuoqi , Sun Sheng , Liu Xiaoting , Song Xinyan , Zhang Haichen , Hu Huawen , Li Guangji
Published: May 2022

A viable and straightforward approach based on a hierarchical system of triple crosslinks (constructed by covalent and dual non-covalent interactions) is reported for constructing a highly tough and rapid self-healing hydrogel.
Tough complex hydrogels transformed from highly swollen polyelectrolyte hydrogels based on Cu2+ coordination with anti-bacterial properties
Authors: Guo Gang , Sun Jian , Wu Yi , Wang Jing , Zou Ling Yun , Huang Jun Jie , Ren Ke-Feng , Liu Cheng-Mei , Wu Zi Liang , Zheng Qiang , Qian Jin
Published: May 2022

The synthesis of tough hydrogels based on metal coordination between Cu2+ and a phosphorus-containing cationic polyelectrolyte for wound dressing is reported, exhibiting excellent anti-bacterial performance and biocompatibility.
DS‐SRI: Diversity similarity measure against scaling, rotation, and illumination change for robust template matching
Authors: Zhang Yi , Zhang Chao , Akashi Takuya
Published: May 2022

This paper presents a novel multi‐scale template matching method that can be applied in unconstrained environments. The key component behind this is a general similarity measure is referred to as the diversity similarity measure against scaling, rotation, and illumination (DS‐SRI). Specifically, DS‐SRI exploits bidirectional diversity calculated from the nearest neighbour matches between two sets of points. Scaling and rotation changes are taken into consideration by introducing normalisation term on the scale change, and geometric consistency term with respect to the polar coordinate system. Moreover, in order to deal with the illumination change and further deformation, illumination‐corrected local appearance and rank information are jointly exploited during the nearest neighbour search. All the features of DS‐SRI are statistically assessed, and the extensive visual and quantitative results on both synthetic and real‐world data show that DS‐SRI can significantly outperform state‐of‐the‐art methods.
Designing and manufacturing of electric arc furnace currents measurement system in Mobarakeh Steel Company by printed circuit board‐type Rogowski coils
Authors: Sadeghi Reza , Samet Haidar , Ghanbari Teymoor , Daryabar Darioush
Published: May 2022

This paper deals with the utilization of printed circuit board Rogowski coils (PCBRCs) for differential protection of electric arc furnace (EAF) transformers in Mobarakeh Steel Company (MSC), Isfahan, Iran. Because of a high level of current (in the range of 100 kA) in the EAF transformers in the MSC, employment of differential protection is quite challenging. Conventional current transformers (CTs) cannot offer reliable performance for very high current levels. The PCBRCs are a branch of Rogowski coils (RCs) that can be manufactured with high precision using computer‐aided design approaches and have the capability for the measurement of very large currents. In this study, we have designed and manufactured two sets of PCBRCs to measure current in the primary and secondary sides of the EAF's transformers in the MSC. The PCBRCs are followed by a signal condition circuit (SCC) which includes a low‐pass filter, amplifier, and voltage‐to‐current (V‐to‐I) converter block. Thanks to the SCC, the high current of the transformers can be properly sensed and transmitted over a long cable that connects the PCBRCs to the relay. Furthermore, a novel model is suggested for the EAF that includes characteristics of both time and frequency domain models. The suggested model is developed using a large number of recorded data from the MSC and can model the non‐linear and time‐variant behaviours of the EAF. The proposed PCBRCs, SCC, and EAF modelling are evaluated by some simulations and experiments in the MSC.
Traque des innovations numériques au service de la transition agroécologique au Bénin
Authors: Paget Nicolas , Nacambo Idrissa , Fournier Stéphane , Moumouni-Moussa Ismaïl
Published: May 2022

Face au défi alimentaire et aux instabilités climatiques, l’agriculture du Bénin doit accroître ses performances économiques, sociales et environnementales, en particulier par le développement de l’agroécologie. Le numérique est souvent cité comme un levier majeur de la transition agroécologique, mais les innovations numériques en agriculture au Bénin restent peu visibles. En mobilisant et en adaptant au numérique la méthodologie de la traque aux innovations des systèmes de culture hors normes, cet article explore certaines innovations numériques dans le secteur agricole au Bénin et s’interroge sur leur capacité à jouer un rôle dans la transition agroécologique. Nos travaux apportent deux contributions principales : la première est méthodologique et montre qu’il est possible de tirer des enseignements de l’application de la traque aux innovations à un autre objet et d’élargir le domaine d’application de la méthode. La seconde est analytique. Partant de la définition d’une situation de référence, nous avons repéré, décrit, analysé et évalué 21 solutions numériques utilisées en agriculture au Bénin, ainsi que les contraintes auxquelles les porteurs sont confrontés. Ces solutions ont été regroupées en deux types : les solutions de collecte de données pour l’aide à la décision et le pilotage, et les plateformes d’échanges et de partage d’informations et de connaissances. Les innovations les plus originales dans le contexte béninois consistent en la combinaison de solutions d’échange d’information et d’utilisation de moteurs d’intelligence artificielle. Les principales contraintes au développement de ces innovations sont relatives au manque de matériel, d’infrastructures et de compétences.
Face detection of migrating learning based on constrained scene
Authors: Ding Xuewen , Chen Jing , Lei Yuting , Sun Panpan , Cai Xinnan , Chang Limei
Published: May 2022

Face detection places an important role in face recognition which is a popular choice for biometric systems. To solve the low face detection rate problem of face detection in constrained scenario, an efficient face detection method based on migration learning was proposed in this paper. In the proposed facial detection approach, data-cleaning was firstly used to optimize the face database. Then the Visual Geometry Group 16 (VGG16) deep learning network was improved to realize migration learning by replacing the softmax regression layer with the multi-scale feature detection layer. Finally, the constrained scene face images for testing were detected and labeled by the trained migration learning model. The WIDER FACE dataset was used for experiments. Experiment results showed that the proposed method can successfully perform face detection in the WIDER FACE dataset and obtain more than 90% detection rate.
A method for evaluating the accuracy of curved surface flattening
Authors: Lian Chengjie , Lou Jingjing , Liu Xiaoqin
Published: May 2022

Based on the analysis of the existing methods for estimating the surface flattening error, they can be roughly classified into two types of estimation methods: the relative area error analysis method and the relative length error analysis method. The advantages and disadvantages of these methods are summarized in the paper. Combining the general surface flattening methods and sheet metal stamping forming process, a more reasonable, scientific and comprehensive evaluation system for the accuracy of surface flattening is proposed. In line with the unfolding characteristics of the grid surface, the relative average area error of triangles is used instead of the traditional area error estimation method. The accumulated length error is replaced by the relative length error of each triangle in the estimation method, and the value of the change in the orientation (direction, position) relationship between the triangles is increased to assess the deformation error of the surface flattening method. The mass attributes of the patch are introduced. The minimum displacement energy method is used to supplement the evaluation of surface flattening accuracy. Finally, a comprehensive evaluation system is established and proposed, which takes into account the accuracy of local and global surface flattening.
Research on applicability test algorithm of wind and rain monitoring equipment of high-speed railway
Authors: Wang Rui , Li Wentao , Ma Zhen , Xu Chengwei , Yang Xue , He Wenxuan , Yang Xingguo , Zhang Jianchun
Published: May 2022

High-speed railway natural disaster and foreign object intrusion monitoring system is an important technical guarantee for the safe operation of trains. As the basic data source, the reliability and stability of meteorological monitoring equipment is an important prerequisite for the system to play a role. Due to the special measurement principle of meteorological monitoring equipment and the inconvenience of equipment inspection along the high-speed railway, there is currently a lack of flexible and efficient applicability inspection algorithms for equipment failure and monitoring data distortion. Based on the measurement principle of the wind and rain monitoring equipment, this paper analyzes the causes of data distortion and abnormal data characteristics, then puts forward the applicability test algorithm of high-speed railway wind and rain monitoring equipment. Through data analysis methods such as correlation test and difference test, the applicability test of anemometers was carried out. The top-cover piezoelectric rain gauge inspection equipment was developed, and the applicability test of microwave rain gauge was carried out by means of data comparative analysis. Finally, we tested the algorithm in actual high-speed rail lines, and the results show that the proposed algorithm can effectively identify the monitoring equipment with poor adaptability.
No-reference image quality assessment based on automatic machine learning
Authors: Qian Qi , Sang Qingbing
Published: May 2022

In different applications in deep learning, due to different required features, it is necessary to design specialized Neural Network structure. However, the design of the structure largely depends on the relevant subject knowledge of researchers and lots of experiments, resulting in huge waste of manpower. Therefore, in the field of Image Quality Assessment (IQA), the authors propose a method to apply Neural Architecture Search (NAS) to IQA. Mainly through the Differentiable Architecture Search algorithm, the structure of the modular Neural Network unit is searched by the stochastic gradient descent algorithm with better training performance by relaxing the operation features into a continuous space. Also, the idea of weight sharing is used to further save. The authors use the mainstream IQA database LIVE to search for Neural Network structures, and retrain and validate the searched structures in four datasets. A large number of experiments show that the model obtained by the search experiment achieves the effect of the best algorithm at this stage, and has a certain quality. The main contributions of this paper are: Transform the DARTS algorithm to adapt the regression problem, and introduce the Neural Architecture Search algorithm into the IQA field and conduct experimental verification.
Design and implementation of deep learning algorithm for image discrimination of light field confocal endoscopy for esophageal cancer and gastric cancer
Authors: Tang Yanyan , Liu Tong , Ding Shigang , Wang Ye , Yue Shuahua , Yang Xuefang , Liu Xiaohui , Lu Li
Published: May 2022

The survival rate of early gastric cancer and esophageal cancer is more than 90%. Confocal endoscopy can detect cell morphology and mucosal glandular structure (depth about 500 μm), presenting a cross-sectional microscopic image unfamiliar to both endoscopists and pathologists. Therefore, using computer-aided diagnosis technology to complete real-time artificial intelligence diagnosis of early esophageal and gastric cancer is of great significance for early detection and early treatment of cancer patients. ResNet convolution neural network based image classification model, the introduction of attention mechanism based on CBAM module to improve the performance of the model, to achieve intelligent diagnosis of confocal endoscopy images.
Simulation on wellbore integrity at casing shoe during fracturing for shale gas wells
Authors: Guo Xueli , Yu Yongjin , Ji Hongfei , Shen Jiyun , LI Jun , Li Bing
Published: May 2022

Wellbore integrity is significant to maintain and improve the production performances of shale wells. In Duvernay Canada, casing deformation near the top of Ireton with a few natural faults and cracks is severe during multi-fracturing. It is urgent to reveal the mechanism to reduce the risk of wellbore failure. In this paper, casing deformation and micro-seismic signal at casing shoe is analysed. The maximum deformation of the casing can reach to be 44.4mm. Based on the focal mechanism, it is easy to get the formation slip displacement. Under the condition of geology and wellbore geometry, a three-dimensional stage finite element method considering the whole drilling process is established to simulate the influence of fault on casing deformation. The results indicate that cement sheath at casing shoes intend to be failure during fracturing, where the fracturing fluid will immerse into the formation of Ireton thorough the micro-annulus of cement sheath. When the pore pressure is large enough to activate the natural fault, the micro-seismic signal at the casing shoe is frequent with the magnitude up to 3. Under this condition, the faults slippage can be 55 mm, and the casing deformation will be 34.9 mm. This is consistent with the actual deformation of casing. Along easy-slip formation position, cement property and wellbore structure should be optimized to prevent fracturing fluid entering the formation. Fracturing operation should be optimized to avoid generating high-magnitude seismic signals during the fracturing process, thereby reducing the possibility of casing shear deformation.
Testing method of explosive function based on motion energy balance
Authors: Zhang Xin , Xu Chundong , Shi Yucheng , Zhang Xuehui
Published: May 2022

The functional capacity of explosives is an important indicator for evaluating the explosive power of explosives. Based on the motion energy balance and the principle of artillery launching, this paper designs a functional capacity evaluation device for explosives. Based on the analysis of the device, an evaluation model for the functional capacity of explosives is established. The measurement parameters is determined according to the model; a comprehensive testing system for functional capacity was constructed, and the feasibility of the functional capacity testing device was verified through testing. The results show that the test method can quantitatively measure the functional capacity of explosives, and can effectively measure and evaluate the explosive performance of explosives.
Existence of Gauss John ellipsoid operator problem
Authors: Yu Li’ao , Zou Du
Published: May 2022

There is a common example in convex geometry and Banach space geometry: the unique ellipsoid with the largest volume associated with each symmetric convex body K is called John ellipsoid. In this paper, we will give some results of John ellipsoid operator problem with Gaussian measure, mainly the continuity of Gaussian measure and the existence of ellipsoid operator.
Preparation and property evaluation of vitamin A cyclodextrin inclusion complex
Authors: Wei Ning , Pei Jinze , Jiang Liye , Xuan Guangshan
Published: May 2022

Hydroxypropyl-β-cyclodextrin (HP-β-CD) is widely used in drug encapsulation and cosolvent of insoluble drugs, modified HP-β-CD derivatives may to make pH sensitive by introducing functional groups. In this study, HP-β-CD derivative was prepared by oxidation cross-linking method with urea as the crosslinker agent. HP-β-CD derivatives and vitamin A (VA) inclusion complex were characterized using FT-IR, DSC, XRD and SEM. The solubilization effect, encapsulation efficiency (EE, %), loading content (LC, %) and in vitro release behavior of cyclodextrin derivatives on VA also investigated at different pH. The experimental results show that urea linked HP-β-CD can significantly increase the solubility of VA up to 32 times then pure water, the EE of the VA inclusion complex reach 66.88±4.56%, and the LC was 15.38±1.12%, The 24h in vitro cumulative release reaches 95.91%(pH=4.5) and 66.68%(pH=7.0) when the ratio of urea to HP-β-CD was 3:1. The HP-β-CD derivatives can increase the solubility of VA and the drug release has pH sensitivity.
Design and implementation of forest fire monitoring system based on internet of things technology
Authors: Hu Zhijie , Chen Fanfan , Shen Ruibing , Li Saihan
Published: May 2022

In view of the frequent forest fire problem, this design uses the Internet of Things technology to design a forest fire monitoring system. This system is composed of data acquisition module, data processing module, display module, locating module and alarm module. The data collection module is responsible for collecting forest temperature values and concentration values of smoke. The collected data is processed by the data processing module, and the processed data is displayed in real time by the display module. When the collected temperature or smoke concentration exceeds the thresholds, the GPS locating module is activated to locate the event. Then, the forest temperature value, smoke value exceeding the threshold and location information are sent to the manager’ s mobile phone in the form of SMS through the Sim800 SMS alarm module for alarm. After experiment, the accuracy of temperature module in this design is ±2°C; The accuracy of smoke density module is ±5Pm; The accuracy of location is ±100m. This design has the characteristics of small size, easy placement, large monitoring range, low cost and high sensitivity, which is suitable for further popularization and application.
Super-metauniverse with cyber life as center in integrating cyber nature and cyber society sky-earth computing (III) beyond cloud computing
Authors: Li Zongcheng
Published: May 2022

According to the analysis and design of this series of articles, with cyber life as the center, using big data platform, IOT, AI technology, and the super-metauniverse system engineering that we advocate to develop and implement, we integrate cyber natural system and cyber social system, and establish a super-metauniverse system (SMS) for the hyper cyber-world. cyber life system is a life system supported by IT and network technology, including cyber physiological system (CPS-2) and cyber psychological system (CPS-3); Cyber natural system is a natural system supported by IT and network technology, including cyber physical system (CPS-1); Cyber social system is a social system supported by IT and network technology, including cyber eventlogic system (CES). Therefore, it is necessary between the real ecosphere and the information ecosphere to organize and manage not only thousands of computers, mobile communication tools and robots thousands of computers, mobile communication tools and robots, but also thousands of people who use computers, mobile communication tools and robots, through the Internet of things, artificial intelligence technology, the bottom layer of big data computing platform, and the super-metauniverse system engineering proposed in this series of articles.
Financial application scenarios and regulatory challenges of blockchain technology
Authors: Tang Jiqiang , Wu Zhen , Zhang Yuxi , Guo Haifeng , Du Xintong , Wang Dongni
Published: May 2022

The combination of the financial industry and technology is conducive to enhancing its ability to serve the real economy, in which blockchain technology plays an important role. The application of blockchain in financial services is mainly reflected in supply chain finance, cross-border payment, credit collection and digital currency. This paper predicts the possible risks and hidden dangers of China’s future blockchain financial industry, analyzes the challenges encountered by the regulator in blockchain management, and proposes the directions the regulator needs to work on in the future.
The establishment of modern enterprise budget based on ERP control system: the evidence from Dongfeng Yueda Kia
Authors: Tan Wenhao , Guo Xiuyuan , Zhao Jianfeng , Wang Yilian , Feng Aoqi
Published: May 2022

Corporate Finance budget as an important part of the work of that enterprise normal operations guarantee. In every enterprise, the budget should be attached great importance to the work. This article is an in-depth understanding of corporate control of the budget process, the meta-analysis presented in the information economy, it should make full use of the information network technology advantages, and actively use our enterprise budget control, real-time control of the budget increase, effectiveness, timeliness improve the operations of enterprises, improve the operating efficiency of funds, and promote sustained and healthy development of enterprises.
Research on the construction of the referral networks of city hospitals and invulnerability in response to major public health emergency
Authors: Rong Hang , Tu Lilan
Published: May 2022

In face of major public health emergencies, how to ensure the orderly and stable operation of city hospitals? Based on the theory and method of complex network, in this paper, we put forward the construction method of city hospital referral networks, analyze the static characteristics of the constructed network, discuss the invulnerability of networks with four attacking modes, and propose two ways (or integrated) to optimize the invulnerability of networks, which are: (i) Identifying and protecting key hospitals that can increase network invulnerability, (ii) Adding hospitals to the network. Taking hospitals of Wuhan as an example and using the proposed construction method for networks, in this paper, a directed-referral network I with 219 major hospitals in Wuhan is constructed. On the basis of network I, 16 mobile cabin hospitals, Huoshenshan hospital and Leishenshan hospital have been added, the referral-hospital network II of Wuhan is achieved. Compared with network I, network II has better referral ability and invulnerability.
Corpus-based study on syntactic complexity of texts by L1 and L2 learners
Authors: Zhang Ronggen
Published: May 2022

Based on 90 argumentative texts from the corpora of LOCNESS and WECCL, the paper attempts to make a study of the syntactic complexity of those texts. All the data are processed online by the Web-based L2 Syntactic Complexity Analyser, and then processed with the corpus tool AntConc and IBM SPSS Statistics 20. The findings include: for one thing, L1 learners use more complex sentences with more verb phrases, and more embedded clauses, in their writings, compared with L2 learners. For another, in writing L2 learners may use dependent clauses with longer size than those by L1 learners despite the L1 learners tend to use sentences embedded with dependent clauses more often. Finally, some pedagogical suggestions are made on how to improve L2 writing course teaching.
Research and practice on the construction of one-stop service platform in university based on “WeCom” in the post epidemic period-Taking Guangdong Ocean University as an example
Authors: Jin Guowang , Zhang Guangya
Published: May 2022

With the continuous development of information construction in university, it has become an urgent need for teachers and students to obtain all kinds of data resources through mobile terminals. During the post-pandemic era, digital process of higher education has obviously been accelerated. In the post-pandemic era, the construction of one-stop service platform of Guangdong Ocean University has been further improved with WeChat enterprise as the carrier. It aims to implement new vision for educational development of the Communist Party of China, take teachers and students as the center, reorganize and present all kinds of services and applications on Wechat Enterprise, provide one-stop service for teachers and students in the whole process of office, teaching and life on campus, and constantly improve the service quality and management efficiency of the university.
Research on the construction of teaching staff in private colleges and universities under the background of “double first class”
Authors: Wang Lina , Chen Mei
Published: May 2022

The construction of “Double First Class” opens a new journey of building a Powerful Country in Higher Education. As an important part of higher education, private colleges and universities also undertake the important mission of talent training. The construction level of the teaching staff of private colleges and universities directly affects the smooth implementation of the national “double first-class” construction. The number of private universities in Shandong ranks among the top in the country. Taking Shandong Province as an example, this paper conducts a research on the construction of the teaching staff of private universities from the aspects of the current situation, problems encountered, problem analysis and countermeasures of the teaching staff of private universities.
A study on the protection and utilization of ancestral temple building in Southeast Hubei province-- A case study of Baini village
Authors: Liu Weiyi , Yang Juan
Published: May 2022

The protection of rural traditional ancestral halls is currently facing severe challenges in the process of rapid urbanization. Aiming at the practical difficulties of traditional ancestral halls, such as the decay of building materials, the damage of building structure, the disappearance of construction techniques, and the destruction of context and environment, this paper analyzes the contemporary value of traditional ancestral halls in traditional villages by taking Baini Village in Tongshan County, Hubei Province as an example. The research points out that the stability of building materials and structures can be improved through the rescue restoration of traditional ancestral halls;the ancestral halls and traditional villages should be integrated into the overall protection and revitalization through strategies such as integration of traditional ancestral halls and villages, integration of new and old, and integration of production and villages, so as to promote the revitalization of rural culture and provide endogenous power for the sustainable development of traditional villages, and provide reference for the future protection of rural architectural heritage.
The experience and enlightenment of Israel’s anti-terrorism intelligence work
Authors: Wang Lin , Lu Duanshi , Yang Yutong , Zhao Miaomiao
Published: May 2022

Israel is one of the countries that are more severely threatened by terrorist forces. During its long-term struggle with terrorist forces, Israel has gradually developed a series of effective anti-terrorism strategies. This article studies the Israeli anti-terrorism intelligence work system, expounds on the relevant characteristics of its anti-terrorism intelligence strategy, organizational structure, the application of intelligent technology, and the development of international anti-terrorism cooperation. On this basis, it summarizes the experience and enlightenments of Israel anti-terrorism intelligence work.
Research on the creative design of Tujia brocade pattern based on the principle of artistic conception drawing
Authors: Su Xiao , Liu Jing , Tang Chunyan
Published: May 2022

Traditional Tujia brocade is inherited and taught through oral and mental-teaching mode. In order to achieve better inheritance and learning effect, modern artists got involved who began to use hand-painted artistic conception drawing to achieve a better inheritance effect. With the development of computer technology, modern artistic conception drawing can make the pattern more intuitively innovative, providing valuable inheritance materials for the inheritance of Tujia brocade. Taking the artistic and creative product design of Zhangjiajie College of Jishou University as an example, this paper analyses the innovative pattern design and application of Tujia brocade based on the principle of artistic conception drawing, which has a profound influence on the creative design of Tujia brocade and the research of related innovative products.
Research on multi-color visible light communication system using RZ-4PAM signals with 67% duty cycle
Authors: Yi Linfang , Shao Yufeng , Wang Anrong , Wang Zhuang , Yang Jie , Yang Qiming , Tian Qing , Yu Ni , Liu Shuanfan , Zuo Renjie , Yuan Jie , Li Yanlin , Chen Peng , Li Chong
Published: May 2022

In order to improve the transmission performance of visible light communication (VLC) system and user’s demand for large-capacity and high-speed, one multi-color VLC scheme is proposed. This scheme uses red-green-blue light-emitting diode (RGB-LED) as the sender to transmit 4-ary pulse amplitude modulation (4PAM) signals with 67% return-to-zero (RZ). At the receiver, one optical bandpass filter is used for channel separation. By system simulation, we have measured the time-domain waveforms before and after transmission, eye diagrams of the three colors signals, and the bit error rate (BER) performance has been analyzed. The results show that at receiver power of -11dBm, the BER at back-to-back case is slightly lower than that of the signals transmitted in the 8m channel. Since 4PAM signals have higher spectral efficiency compared with the traditional binary signals, this scheme has potential application value in indoor broadband access system.
Research on long distance submarine optical fiber transmission system using MSK downlink signals
Authors: Wang Zhuang , Shao Yufeng , Wang Anrong , Yang Jie , Hu Qinzheng , Yang Qiming , Yu Ni , Yi Linfang , Tian Qing
Published: May 2022

The commonly used submarine optical fiber communication system is expected to provide long-distance reliable signals transmission. We present a novel optical fiber submarine system using minimum shift keying (MSK) encoded downstream signals. 10Gb/s MSK coded signals are successfully transmitted over the 100km submarine single-mode fiber (SMF).The optical spectrums, eye-diagrams and bit error rate (BER) before and after transmission of MSK signals in the system were measured and analyzed. The results show that, compared with conventional access methods, this scheme can provide high-speed, stable and secure data communication.
Detection method of heterotropic fiber based on improved YOLOv5
Authors: Zuo Hengli , Du Yuhong
Published: May 2022

Aiming at the problems of inaccuracy and poor real-time detection of heterosexual fiber in cotton cleaning process, a target detection model of heterosexual fiber based on YOLOv5 network was proposed to realize fast and accurate identification and location of heterosexual fiber in cotton. YOLOv5 was selected as the basic target detection model, and depth separable convolution was introduced to reduce the number of parameters of the detection model and improve the detection speed. Combined with SE module of channel attention mechanism, it can reduce irrelevant information interference and enhance feature expression ability. Comparative ablation tests were performed on YOLOv5 model before and after modification. The experimental results show that the improved YOLOv5 model has a mAP of 91.6% and a frame rate of 83 frames /s. The improved YOLOv5 model can not only improve the detection accuracy but also improve the detection speed, which can better meet the requirements of accuracy and real-time detection of cotton foreign fiber.
Study on Critical Concentration of Dynamic Gelation of New Chromium Crosslinker
Authors: Cao Ruibo , Liu Guochao , Chen Wenlin , Hu Liangfeng , Yan Wei , Liu Haibo
Published: May 2022

A chrome gel system with 13 million molecular weight and 19 million molecular weight polymer and DQ-8 cross-linking agent is dynamically gelled under different conditions of 50-mesh and 100-mesh screens under different shear rates. Concentration limit. The experiment shows that the critical concentration of 13 million molecular weight gelation is 500-700mg/L, and the critical concentration of new cross-linking agent in the system is 80mg/L-90mg/L. The system of new cross-linker is cut by steel mesh. The post-gelation time is prolonged. Between 6h-10h, after 12 days of testing, the viscosity of the chrome gel system after gelation can still remain above 1000mPa·s, and the viscosity of the ungelatinized solution drops below 10mPa·s.
Cause analysis of surface micro-cracks on 12Mn pipeline steel
Authors: Tian Yushi , Chu Shaoyang , Xu Lijun , Wei Jun , Qiu Shengtao , Zhu Rong
Published: May 2022

In order to find out the causes of defects in 12Mn pipeline steel produced by a Chinese steel pipe plant, the characteristics of the defects are analyzed and discussed by means of metallographic microscope, scanning electron microscope, ASPEX scanning electron microscope and transmission electron microscope and so on. The physical and chemical tests results show that there are several typical micro-cracks after slight grinding the pipe outer skin in which a few large particles of brittle alumina reside, which possess the macrocharacteristics of continuously curving and extending along the radial direction as well as many clear and smooth inner edges and few secondary branches, so that the cracks are not experienced a long and hightemperature oxidation process. The industrial tests indicate that most of the defects have been proved occurred in the quenching and tempering process of the steel pipe production. The main cause of steel pipe cracking is the stress concentration arose from some large brittle inclusions in the quenching process. When the critical strength of the steel pipe is exceeded by quenching stress, a micro-crack will generate and propagate along the grain boundary. These defects of steel pipes could be eliminated by means of taking steelmaking process optimization measures.
Study on mechanical properties of traffic pavement materials under fatigue loading
Authors: Feng Guotong , Wang Wenqing , Ma Liuting , Liu Fengjun
Published: May 2022

The durability of pavement subgrade materials is the most important indicator for judging their merits as well as their mechanical properties. The durability of pavement subgrade material is mainly reflected in its water stability, because in the actual pavement environment, the subgrade is subjected to the infiltration of groundwater, immersion and the washout of pressure water under the concrete slab. The subgrade is subjected to a series of damage caused by freeze-thaw cycles and wet-dry cycles due to changes in temperature. In view of this, this chapter has targeted. In view of this, this chapter focuses on the frost resistance, water stability, scour resistance, dry shrinkage and sulfate erosion resistance of iron tailings as pavement base material. The study is carried out to simulate the real situation as much as possible to provide more detailed and accurate guidance for the actual engineering application. The study will provide more detailed and accurate guidance for the actual engineering application.
Self-assembly of ZnO nanodots on glass substrates by a facile sol-gel method
Authors: Yang Weijia , Zhao Jingjing , Liu Lihua , Guan Zeyi , He Xin
Published: May 2022

In this work, we report the self-assembly of ZnO nanodots on the glass substrates by a sol-gel method. Firstly, the precursor solution consisted of zinc acetate and the solvent of ethylene glycol or propylene glycol is employed to fabricate precursor thin film by spin coating. Secondly, the as-grown precursor thin film is annealed at a low temperature to form the self-assembled ZnO nanodots. The effects of solvent type, precursor solution concentration and annealing time on the morphologies of the self-assembled ZnO nanodots were investigated. In addition, the self-assembly evolution of the ZnO nanodots is proposed in order to helping people to understand the formation of the nanodots by mean of sol-gel method.
Preparation and characterization of a novel emphatically charged strengthened chitosan composite nanofiltration membrane
Authors: Mu Tao , Wang Qiang , Cao Liang , Zhu Xiaohang , Zhao Zhiru
Published: May 2022

In this paper, chitosan was grafted with acrylic acid and positively charged elements, and a series of reinforced nanofiltration membranes were prepared by coating modified chitosan polymer with polysulfone ultrafiltration membrane as support. The structure of chitosan derivatives and polymers was characterized by infrared spectrum, and the membrane structure was characterized by scanning electron microscope and atomic force microscope. The performance of composite nanofiltration membrane was closely related to the structure of polymer and the electrical properties of positively charged elements. The rejection rate of 50% molar ratio composite nanofiltration membrane to CaCl2 reached 97.4%. The corresponding flux is 430.7 Lm-2h-1. The retention order was: CaCl2 > NaCl > Na2SO4. The tensile strength increased by 27.3%. Acid resistance (5%HCl)) was improved by 50.5%. Alkali resistance (5%NaOH) increased by 42.2%. The results showed that the positive charge enhanced chitosan composite nanofiltration membrane had excellent performance. The charge effect had no effect on NaCl and Na2SO4, but had significant effect on CaCl2. The membrane is a typical positive charged nanofiltration membrane suitable for separating high-valent cations from weak acids or weak bases.
Property and Structure Characterization of High Molecular Weight Polyacrylonitrile Polymers Initiated by 2,2'-Azobis (2-methyl propionamide) Dihydrochloride Using Aqueous Deposited Polymerization Technique
Authors: Zhao Yaqi , Liang Banglei , Zhao Zhenxin , Feng Qiao
Published: May 2022

Powdery high molecular weight polyacrylonitrile (HMW-PAN) polymers were successfully synthesized by aqueous deposited polymerization (ADP) method with 2,2'-azobis (2-methyl propionamide) dihydrochloride (AIBA) as the initiator and itaconic acid (IA) as comonomer. The utilization of IA into the ADP system was conducive to relax the proceeding of thermo-oxidation process. Differential scanning calorimeter (DSC) curves of obtained PAN copolymers showed the doublet peaks character under air atmosphere, attributing to the exothermic cyclization and oxidative reactions during heat-treatment process. With the utilization of IA in the reaction system, crystallinity and grain sizes of the PAN polymers decreased. The stretching vibration of nitrile group (C≡N) at 2240cm-1 was the strongest peak in both Fourier transform infrared spectra (FTIR). And the stretching vibration and bending of CH2 were the stronger peaks in FTIR. Amido group (NH2), carbonyl group (C=O) and C-O single bond existed in FTIR of PAN homopolymer and copolymers, indicating occurrence of C≡N hydrolysis during polymerization process except carboxyl group (COOH) introduced by IA.
Research progress of water-based release agents
Authors: Liang Bo , Yang Ye , Li Junping
Published: May 2022

A mould release agent is an additive that makes the moulded product easy to detach from the mould, it forms a protective film on the product to ensure the surface quality of the mould. Mold release agents are divided into water-based release agents, oil-based release agents and powder-based release agents. Water-based release agents are widely used because they have the advantages of low price, good release effect, green environment protection, smooth casting surface, good air tightness and good automaticity operation. According to the effective release material in the mold, release agent can be divided into silicone oil type, wax and fatty acid type water-based mold release agent. In this paper, the composition, properties and application characteristics of various water-based release agents were analyzed, and the future development direction of water-based release agents was forecasted.
Optimization method for complex surface partitioning and cutting parameters in 5-axis machining
Authors: Chen Liangji , Li Zhiguang , Liu Zhi , Wei Zisen
Published: May 2022

For complex surfaces with variable geometric features and high processing requirements, the current stage still uses more conservative machining cutting parameters to generate five-axis machining tool positions, which inevitably leads to some parts not to obtain the best cutting state, and the generated machining tool positions are poorly adapted, so it will produce a great processing deformation error seriously affects the surface quality. In addition, conservative cutting parameters applied to different geometric features of the surface area is very likely to induce dramatic changes in the machining process cutting forces and machine motion parameters, resulting in uneven distribution of machining errors and local super poor, seriously affecting the quality of machining. In five-axis machining, due to the introduction of two rotary axes, the tool vector can be rotated arbitrarily in the spatial domain. When machining complex surfaces, the distance between the tool center coordinates and the oscillation center or rotation center of the five-axis machine will change with the curvature of the surface. surface quality. Therefore, the optimization of tool cutting parameters in 5-axis simultaneous machining is a technical bottleneck that needs to be solved urgently.
Analysis of Mechanical Properties of Loess with Cement Incorporation Ratio
Authors: Rong Baogui , Liu Qingbo , Mei Gang , Cheng Bingwei
Published: May 2022

Taking loess as the research object, the influence of cement content on mechanical properties of loess was studied. Firstly, the basic physical parameters of loess were obtained through laboratory physical index test, and improved by using Portland cement. Secondly, under different incorporation ratios (3%, 5%, 7%, 9%), heavy compaction test and liquid-plastic limit test were carried out respectively to obtain mechanical parameters of cement-improved loess. Finally, the shear strength parameters and compressive strength of the improved soil samples are obtained by unconsolidation undrained triaxial shear test and unconfined compressive strength test. The results show that the liquid limit, plastic limit and plastic index of loess improved by adding cement increase compared with the original soil sample, indicating that the binding force between soil particles is improved and the plasticity is enhanced. The variation range of dry density and water content has no obvious relationship with the content of cement. At the same time, the compressibility of soil is reduced and the collapsibility of soil is eliminated. With the increase of age, the strength of cement-modified soil also increases. Through unconsolidated and undrained triaxial shear tests and unconfined compressive strength tests, the strength of loess improved significantly after adding cement, and the strength of soil-cement increased with the increase of cement content, and water stability was obviously improved.
Effect of different replacement depth on slope stability of roadbed
Authors: Jia Zhaofeng , Liu Yu , Rong Baogui , Ling Pingyu
Published: May 2022

Combined with the engineering example of Sanyangchuan tunnel and lead project in Tianshui City, firstly, the cement improved soil and lime improved soil with better mechanical properties were selected by experiment. Secondly, based on Geostudio software, a numerical calculation model is established to analyze the influence of different replacement materials and different replacement depths on the stability of the roadbed slope for different replacement ranges.
Research Progress in Characterization Methods of Anti-corrosion and Wear-resistant Polyurethane Coatings
Authors: Jia Xinghui , Song Xiwen , Fan Jinjuan , Sun Wei , Liu Changkui
Published: May 2022

Polyurethane is a coating material widely used in the field of anti-corrosion and wear resistance. At present, a lot of research work has been carried out in the research and development of polyurethane materials and process improvement. However, there are few researches on the characterization methods of polyurethane coatings, and suitable characterization methods are selected. Conducive to the improvement and application of materials. This article summarizes the characterization methods of polyurethane coatings from the aspects of morphology, structure, mechanical properties, electrochemical properties and thermodynamic properties. It is found that there is no standardized and unified evaluation standard for the electrochemical characterization methods of polyurethane; polyurethane as a high molecular polymer has a certain sensitivity to the service environment. Humidity and temperature have a great influence on its physical and chemical properties. Conventional characterization methods cannot perform microstructure characterization under the stress state of the material and the service environment. The establishment of standardized and unified electrochemical evaluation standards for polyurethane; the ability to characterize polyurethane under service conditions is an important research direction for improving the characterization method.
Research on Photo Catalytic Performance of TiO2 Film Doped with Li+
Authors: Zhang Jing , Huang Zhengxing , Zheng Liming , Tian Xiaobo , Yin Wengang , Ding Shihua
Published: May 2022

Based on sol-gel method and spin coating process, TiO2 film doped with Li+ is prepared by utilizing analytical pure butyl titanate, lithium nitrate, absolute ethanol, glacial acetic acid, acetylacetone and deionized water as raw material. The Li+ ion which has equal radius as Ti4+ ion is chosen in experiments for doping and modification. Experimental results show certain increase of catalytic efficiency in TiO film doped with Li+. However, the increase level of catalytic efficiency gradually shows some decrease when the dopant amount changes from 0.025mol to 0.1mol. Catalytic efficiency is raised to 25.7% when the dopant amount is 0.025mol.