bluuebunny/crossref_metadata_2025_split huggingface dataset:
Ring resonator modulators based on double-layer graphene and Chalcogenide glasses waveguide in mid-infrared light
Authors: Zhou Yong , Lu Rongguo , Wang Guangbiao , Lyv Jiangbo , Shen Liming , Lin Rui , Yang Zhonghua , Liu Yong 
Published: May 2021

Abstract
A ring resonator modulator based on double-layer graphene and Chalcogenide glasses waveguide is presented and investigated. Wide bandwidth mid-infrared light operation can be achieved. A strong interaction between mid-infrared light and graphene is obtained, which change the effective mode index in the waveguide significantly while the change of applied voltage. Besides, the modulator we proposed owns a large extinction ratio of 33.57 dB.
Synthesis and Luminescence Properties of β-NaGdF4:Yb3+, Er3+ Nanoparticles
Authors: Zhang Cong , Yang Ju , Cui Wenzhe , Ren Guozhong 
Published: May 2021

Abstract
Ln (Yb3+Er3+)-doped NaGdF4 nanoparticles were prepared by a hydrothermal method. The structure and composition of the samples as prepared nanomaterials were characterized by XRD, TEM, and UV-visible absorption-spectrum analysis. Based on further analysis results that are rarely reported, the cyclohexane solution sample shows peak at 376, 520 and 653nm. The transmitted spectrum indicated that all samples present the pure hexagonal phase with nanorods microstructure. It was found that the Gd ions’ doping percentage from 73% to 93% is more beneficial to glow. The synthesis steps of the hydrothermal method are simple and the particles synthesized by this method showed uniform size, table structure and good dispersion. The lanthanide fluoride nanocrystals prepared in this experiment can be used as an excellent optical material. The samples were then irradiated by laser 980 nm at room temperature, and they emitted bright and unusually stable upconvert visible light. Experiments have shown that NaGdF4 (Yb3+Er3+) can present good up-conversion luminescence. Therefore, it provides us with more possibilities in application fields such as probes, scanning and display.
Research on Temperature Measurement Technology of Platinum Film Thermistor
Authors: Zhang Bingtao , Chen Xi , Yuan Jiafu , Zhu Haidong 
Published: May 2021

Abstract
Platinum film thermistor is developed by combining platinum film thermistor with thin film technology, which solves the cost and application problems of platinum film thermistor components. The principle, fabrication process and application of platinum film thermistor are introduced. A temperature acquisition device of platinum film thermistor is designed. It is verified that the platinum film thermistor has the characteristics of fast response and high accuracy. The temperature data of aluminum alloy plate heated at a single point is collected by using the temperature measurement system. The characteristics of the platinum film thermistor model are verified by comparing the collected data with the simulation data. The results show that the platinum film thermistor can accurately and efficiently complete the fine temperature change measurement, which has a broad development prospect.
Self-induced antimony compositional variation GaAs/Ga(As)Sb core-shell nanowires by molecular beam epitaxy
Authors: Yubin Kang , Xiaobing Hou , Jilong Tang , Xiaohua Wang , Zhipeng Wei 
Published: May 2021

Abstract
Self-catalyzed GaAs/GaAsSb heterojunction nanowires (NWs) were grown on Si (111) substrate by molecular-beam epitaxy (MBE). The GaAs/GaAsSb heterojunction NWs were determined by XRD and Raman spectra. Antimony (Sb) compositional variation of GaAs/Ga(As)Sb heterojunction NWs have been clearly evidenced by XRD spectrum, energy-dispersive X-ray (EDX) spectroscopy combined with absorption spectra. Detailed electron microscopy investigations indicate that the As-Sb exchange at the GaAsSb NWs surface during growth resulting in an outward diffusion of Sb (and corresponding inward diffusion of As), the structure of GaAs/GaAsSb/GaSb and GaAsSb/GaSb core-shell NWs were formed. This study offers a possibility to grow ternary III-V NWs with complex structures that can be used for electronic and optoelectronic applications.
Detection of Metal Surface Defects Based on YOLOv4 Algorithm
Authors: Zhao Haili , Yang Zefeng , Li Jia 
Published: May 2021

Abstract
To solve the problem of low recognition accuracy and low defect location accuracy in traditional detection of surface defects of metal materials, this paper innovates on the basis of YOLOv4 architecture, and studies the influence of adding feature pyramid network module to different position of model neck on detection algorithm. Experiments have shown that adding the feature pyramid network (FPN) module after sampling on the neck network can enhance the feature information expression ability of the feature map originally input to the detection head in the size of 80×80 and 40×40, and achieve better detection results, and achieve better detection results. The experimental results show that adding feature pyramid network module to the neck can effectively improve the detection accuracy of the algorithm. Finally, compared with the traditional YOLOv4 network, the average recognition accuracy of this model can reach 92.5% and the recognition accuracy is improved.
Non-destructive peak junction temperature measurement of double-chip IGBT modules with temperature inhomogeneity
Authors: Wei Lei , Guo Chunsheng , Guo Hao , Liu Yunong , Zhang Shiwei 
Published: May 2021

Abstract
Considering the problem of measuring the peak junction temperature of a double-chip module with temperature inhomogeneity, we use a double-chip parallel model to analyze peak junction temperature measurement error for the traditional electrical method. An improved test method is proposed that is based on the small current–voltage drop method—specifically the dual current test method employing an extended-dimension calibration curve library. This method realizes a match of the calibration current with the test current by expanding the dimension database, eliminates errors of temperature measurements, and finally obtains the peak junction temperature of the module. The measurement result is close to the set temperature of the model, thereby verifying its accuracy.
Ultrafast non-volatile 1x1 optical switch using phase change material Sc0.2Sb2Te3
Authors: Xie Xuanxuan , Liu Furong , Zhang Lulu , Lian Yangbo , Li Yu 
Published: May 2021

Abstract
Phase change materials are widely used in photonic devices due to their extremely large optical properties. Phase change optical switches use the difference in refractive index between amorphous and crystalline states to achieve “on” and “off”. In this paper, we design a Si-Sc0.2Sb2Te3 (SST) hybrid waveguide 1x1 optical switch. The finite element method was used to optimize the structural parameters of the device and the modal distribution of TE polarization was calculated. The transmission performance of the device is simulated by the FDTD method. In this case, a very compact, 2 µm long SST shows a large extinction ratio of more than 12 dB and over 100 nm bandwidth operation.
Research on Life Prediction of Motor Bearing Based on Vibration Signal
Authors: Fan Qingchuan , Yu Fei , Xuan Min 
Published: May 2021

Abstract
In order to solve the problem of motor bearing life prediction, a model of Long and short time memory (LSTM) network remaining life prediction based on genetic algorithm (GA) optimization is proposed. Firstly, the time-domain and time-frequency domain features of vibration signals are extracted. Secondly, the super-parameters of LSTM network are optimized by GA algorithm. Finally, the trained LSTM network is used to predict the remaining life of motor bearings. The results show that the model established in this paper can effectively predict the remaining life of motor bearings, which is of great significance to the study of health management and life prediction of motors.
10GHz regeneratively mode-locked erbium-doped fiber laser combined with nonlinear amplifying loop mirror
Authors: Liang Ke , Zhou Yue , Xu Kun 
Published: May 2021

Abstract
Mode-locked fiber lasers can generate short pulses with a high repetition rate. It can be used in nonlinear optical imaging, photo-communication and other fields. Obtaining narrow pulses with high repetition frequency has become a hot research topic. In this article, we demonstrate a hybrid mode-locked fiber laser, which is a regeneratively mode-locked erbium fiber laser operating at 10 GHz, incorporating a nonlinear amplifying loop mirror to generate a 1.9 ps pulse sequence. This all-fiber laser with a high-repetition-rate and short pulses has the advantages of high stability and self-starting, which has a wide range of applications.
Research on Fabric Defect Detection Based on Multi-branch Residual Network
Authors: Qin Runtian , Li Yu , Fan Yujie 
Published: May 2021

Abstract
Aiming at the problem that traditional object detection models have low recognition accuracy for small and medium-sized defects. Based on the original residual module, this paper adds a new convolution branch that dynamically adjusts the size of the receptive field with the number of network layers, and then replaces the residual module in the Hourglass-54 down-sampling stage, and proposes a new backbone network: Hourglass -MRB. The experimental results show that the Corernet-Saccade model using Hourglass-MRB improves the recognition accuracy of small and medium-sized fabric defects by 5.8% and 5.6%. The overall recognition accuracy of the system reaches 81.5%. Theoretically,the speed of fabric defect detection reaches 110 m/min. This article provides more effective support for advancing the internationalization of textile quality assessment.
Design of Amplifier for Wearable Human ECG Sensor with Low Power and Low Noise
Authors: Xue Di , Cai Ruihua , Liu Yi 
Published: May 2021

Abstract
Electrocardiograph (ECG) data is an important index to determine the human heart state, which helps diagnose heart disease in an early stage. Since the ECG signal is instantaneous, it is important to make the ECG signal collector wearable and have good battery life. The wearable ECG devices need to have certain properties like interference suppression ability of acquired signal, low power consumption, low noise, and high integration, putting forward crucial requirements for the design of the amplifier. To meet the properties, the front-end analog processing circuit with interface input buffer stage structure and post-amp structure was proposed here, which has the characteristics of small size, low power consumption, low input referred noise, fair common-mode rejection ratio, and high input impedance. Besides, as one of the industrial-grade circuit simulation software, LTspice was used to design the circuit structure and analyze the corresponding performance. According to the circuit design and simulation testing, it turned out that the circuit in this work can be quite simple, and all the performance indexes met the practical demands. The frequency range was 0.1Hz∼100Hz, the voltage was 1.2V, the differential gain was 40.37dB, the total integrated input-referred noise was 3.48uVrms, and the total power consumption was 1.75uW. In summary, our data indicate that the ECG device we design is small enough to be wearable and has low power consumption.
Study on National Technical Specification of the Standard Retroreflectivity Measurement Device
Authors: Yue Liu , Yishu Zhou , Zhengwei Leng , Jinjin Cao , Chang Liu 
Published: May 2021

Abstract
Start your abstract here…The study aims to explore the technical specifications of the standard retroreflectivity measurement devices. Based on the measurement principle of retroreflection coefficient, the metrological characteristics of standard retroreflectivity measurement devices were proposed and the three main metrological indices of light source (color temperature, illuminance and positioning error of incident angle) were experimentally explored. The allowable error range of the retroreflection coefficient measurements was determined to calculate the corresponding ranges of metrological indices. With the entropy weight method, the weight of the influence of each index on retroreflection coefficient measurements was analyzed. The analysis results showed that the illuminance had the most significant influence on the retroreflection coefficient and accounted for 41.30%, followed by color temperature (34.43%) and angle change (24.26%). The study provides the important technical support for the development of technical specifications of standard retroreflectivity measurement devices.
Predictive control of FlexRay vehicle-mounted network based on neural network
Authors: Wang Yi , Chen Min , Ma Jianjun , Zhang Jigui , Fu Jiang 
Published: May 2021

Abstract
Aiming at the problem that the control performance and stability of the system can not guarantee the security and reliability of FlexRay network control system when the FlexRay vehicle network control system transmits data under heavy load. So FlexRay vehicle network prediction controller based on neural network is proposed. By predicting the current state of the vehicle, and the running status of the network at the next moment, it can adapt the dynamic workload of the vehicle network system in a way of adjusting the workload autonomously. The method uses a nonlinear neural network model to predict future model capacity. The controller calculates the control input, and by controlling the input, it optimize the performance of the network model in a certain period of time. According to the square result obtained by Matlab/Simulink, the neural network predictive control has good learning ability and self-adaptability, which can improve the performance of the FlexRay vehicle-mounted network control system.
Global mortality risk assessment from river flooding under climate change
Authors: Zhang Junlin , Xu Wei , Liao Xinli , Zong Shuo , Liu Baoyin 
Published: May 2021

Abstract
Floods that cause yearly economic losses and casualties have increased in frequency with global warming. Assessing the mortality risks of populations due to flooding is important and necessary for risk management and disaster reduction. Thus, this paper develops a method for assessing global mortality risks due to river flooding. Global historical annual death tolls are first estimated during the historical period 1986–2005 (T0) by using available mortality vulnerability functions of river flooding. Then, the best vulnerability function is selected according to lower root mean square errors (RMSE) and the differences in the multi-year mean (DMYM) values. Next, the adjustment coefficient K
c for each country (region) is calculated to use in the revision of the selected vulnerability function. Finally, the mortality risks are estimated based on an adjusted vulnerability function. As a case, the paper assessed and analysed the global mortality risks due to river flooding during 2016–2035 (2030s) and 2046–2065 (2050s) for the combined scenario of the Representative Concentration Pathway 4.5 (RCP4.5) and the Shared Socioeconomic Pathway 2 (SSP2), and the RCP8.5-SSP5 scenario. The results show that the estimation errors of the death tolls in most countries (regions) decrease after adjusting the vulnerability function. Under the current defense capacity and vulnerability level, the average annual death tolls of RCP4.5-SSP2 and RCP8.5-SSP5 in the 2030s will increase by 1.05 times and 0.93 times compared with the historical period. They will increase 1.89 and 2.20 times, respectively for the two scenarios during 2050s. High-risk areas are distributed in the south-eastern Eurasia.
Giant Clam Conservation in Sabah: a need for the appreciation of the Bajau people’s traditional ecological knowledge
Authors: Abd-Ebrah N A , Peters R F 
Published: May 2021

Abstract
Kima (Tridacna sp.) is a type of giant clam that can be found in Indo-West Pacific tropical coral reefs. It is endangered due to its excessive exploitation as a source of exotic food and the degradation of its habitat. The gazette of marine parks in Sabah is a positive modern conservation effort to reduce threats on endangered marine species especially those found in the northern part of Sabah. Integral to the conservation of giant clams within those marine parks is the appreciation of indigenous knowledge of once known sea gypsies i.e. the Bajau people. Current conservation methods at several sites in Sabah’s marine park had shown several challenges, which circulate tension among the economics of local communities. To explore the possibility of appreciating indigenous knowledge into the conservation of giant clams, a scientific study with the objective of documenting traditional consumption method of the Bajau people was carried out. Direct observations and interviews on the local people were conducted, while descriptive statistics were used to analyse all collected data. Finding of this study shows the existence of traditional ecology knowledge (TEK) and traditional management among Bajau people pertinent to the conservation of Kima. TEK can complement conventional science and help to make more informed management decisions for clam conservation through for hybridization of modern and traditional management to customary management in managing and conserving giant clam population in Sabah’s marine parks. A synthesized advice to use traditional ecology knowledge as tool in developing more effective knowledge-inclusive partnerships between indigenous communities, researchers and policy decision-makers is provided in this article.
Antiproliferative activity of five garcinia species collected in Sabah, Malaysian Borneo against estrogen receptor-human breast carcinoma (MCF-7) cell line
Authors: Ahmad N E , Abu Bakar M F , Suleiman M , Abu Bakar F I , Sabran S F , Kormin F 
Published: May 2021

Abstract

Garcinia species are well-known for their unique properties of having natural secondary metabolite compounds called xanthone as well as their ethnomedicinal values such as antioxidant, anticancer, anti-inflammatory and antibacterial properties. The study was conducted to investigate the antiproliferative activity of peel, flesh and seed extracts of G. dulcis, G. parvifolia, G. nitida, G. mangostana var. mangosta and G. cambogia collected from Malaysian Borneo (Sabah) against estrogen receptor-positive human breast carcinoma (MCF-7) cells. The antiproliferative activity was assessed using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The results showed that G. dulcis seed induced strongest antiproliferative activity against MCF-7 cancer cell line with the IC50 value of 2.5 ± 0.0 µg/ml, followed by G. dulcis flesh, G. mangostana var. mangostana peel and G. dulcis peel with IC50 values of 9.33 ± 3.21, 11.17 ± 1.04 and 17.67 ± 2.08 µg/ml, respectively. Meanwhile, the IC50 value for G. cambogia peel was 56.67 ± 10.5 µg/ml. No IC50 value was detected in all parts of G. parvifolia and G. nitida at concentration tested ( < 100 µg/ml). Overall, this study clearly showed that the whole fruit of G. dulcis displayed potent cytotoxic effect by inducing antiproliferative activity at low concentration. Further studies are needed in the future to develop this fruit as pharmaceutical and nutraceutical product for the treatment and prevention against cancer.
Presence of moonrat (Echinosorex gymnura) at selected forest reserves in Central Forest Spine (CFS) landscape of Peninsular Malaysia
Authors: Faradiana N M F , Shahfiz M A , Nor Hazwani A R , Kaviarasu M , Alwani N Z , Rusli T 
Published: May 2021

Abstract
Surveys on moonrat were conducted at 13 sites under 11 fragmented forest reserves of five CFS ecological corridors located in the states of Negeri Sembilan, Johor, Terengganu, Pahang and Kelantan. The surveys were conducted between February 2018 to September 2019. Not much information on moonrat is documented at these forest reserves. Therefore, the study aims to document the presence of moonrat within CFS landscape in Peninsular Malaysia. A total of 100 collapsible cage traps were deployed at each surveyed site. Cumulatively, a total of eight individuals of moonrat were recorded from six forest reserves. Tanum FR and Ulu Jelai FR located in Pahang, harbour highest number of individual of moonrat, respectively with two individuals in each forest reserve. Forest conditions such as canopy closure, vegetation density and food resources may affect the presence of moonrat. Based on the information, further conservation measures can be strategized in order to conserve these fragmented forest reserves of CFS ecological corridor as a habitat for this mammal.
Perception of Subject Matter Experts (SMEs) on Various Curation and Preservation Techniques for the Development of Natural History Gallery in Malaysia: A Qualitative Study
Authors: Fatin Z , Othman N , Haris H , Najmuddin M F , Indara Rahayu M N , Md Zairi Z , Abdul-Latiff M A B 
Published: May 2021

Abstract
Preserving animal’s body or part of the animals have become an important and well-known conservation medium to ensure that the future generations are still able to enjoy the biodiversity and all the incredible species that live within it. This paper aims to present a qualitative study on perception and preference of subject matter experts (SMEs) on various curation and preservation methods that is suitable for certain animals for the development of Natural History Gallery. Interview with the SMEs were done by using semi-structured questionnaire and prior to this, permission were gained from the respondents by signing the Informed Consent Form (ICF). The findings suggest that the preservation methods of specimens ultimately depend on the purpose of specimens collected, either to be preserved as research specimens or exhibition specimens. The information gained form this study will be valuable as directive for the development of natural history gallery in Malaysia.
The effect of enzyme concentration on physcical characteristics of pumpkin (Cucurbita moschata) puree and its dried extract
Authors: Kormin F , Sakinah R A , Iwansyah A C , Hesan A 
Published: May 2021

Abstract
Pumpkin (Cucurbita moschata) contain many nutritional and biologically active components such as carotenoid content, polysaccharides, sterols, vitamins and protein. Since pumpkin has perishable characteristics, pumpkin must be preserved to increase the shelf life. The present study describe the possibility of producing spraydried pumpkin extract to increase the shelf life. Since pumpkin have high viscosity, it tend to cause deposit in the wall of spray drying chamber. With the help of enzyme liquefaction technique, the viscosity of the pumpkin can be reduced. In this research, pumpkin puree were individually treated with Pectinex Ultra-SP (0-2.5% w/v). Then, concentration Pectinex Ultra SP that produce the best viscosity reduction of pumpkin puree were chosen and treated with Celluclast 1.5 L (0-2.5% w/v). The results showed that 2.5% w/v of both Pectinex and Celluclast 1.5 L produced high viscosity reduction, clarity, total soluble solid and low pH. Then this pumpkin extract are subjected to spray drying condition and physical properties are measured. The spray drying of pumpkin extract with 2.5% w/v Celluclast 1.5 L and 2.5% w/v of Pectinex Ultra SP showed the higher yield of pumpkin powder, while no differences in moisture content, water activity and colour.