bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quantum Codes Constructed by Quantum Caps in PG (4, 5)
Authors: Guan Chaofeng , Li Ruihu , Li Husheng , Zhan Xuizhen , Yao Yu , Lu Shiwei , Chen Xuan 
Published: June 2021

Abstract
In this paper, 57 quantum caps in PG (4,5) are found using a computer-supported search method, and related quantum error-correcting codes are constructed via CSS construction. By comparison, most of these codes have good parameters, and some of them enhance the existing results.
Structural strength of iso-polyhedral beryllium alloy rotating mirror for ultra-high-speed camera
Authors: Li Chunbo , Wen Yinchen , Chen Shoujun , Du Chenlin , Ruan Shuangchen , Yang Can 
Published: June 2021

Abstract
This study aims to examine the influence law of polyhedron structure on the spatial mechanical properties of ultra-high-speed rotating mirrors. To this end, polyhedral beryllium alloy rotating mirrors are investigated on the basis of elastoplastic theory and finite element method. The maximum stress is located at the end position of the contact between the shaft and the mirror body. Stress increases with the number of mirror faces. The different structures have a negative stress gradient. The structural strength of rotating mirror is affected by the strength of the mirror body material in high-speed rotation of the tensile force of centrifugal force. The lateral deformation of the mirror surface is caused by the combined effect of compression of centrifugal force generated by the material of sharp-corner and the tretching of tensile force caused by the material at the centre of the mirror at high-speed rotation. The amount of mirror surface deformation is not proportional to the number of faces. The rotating mirror with iso-quadrangular structure has the best lateral deformation effect. This research provides a theoretical basis for the research and design of rotating mirrors with high potential value.
Research on Improved Static Compensation Flux Error MARS Observer Based on SMC
Authors: Xing Pengkun , Deng Xin , Zhou Shengtao , Zhu Wenbai 
Published: June 2021

Abstract
Aiming at the integral drift and saturation problems of the traditional voltage model flux observer, an improved rotor flux observation scheme is proposed. A programmable low-pass filter is used to replace the pure integrator, and the flux error before the filter is corrected. The sliding mode speed controller is used to replace the traditional PI speed controller. The proposed observer can reduce the speed response overshoot of the system at medium and high speed range, reduce the steady-state time, and improve the load capacity and robustness of the system. The simulation results show the effectiveness of the algorithm.
Design and research of photovoltaic modules in energy routers based on cascaded H-bridge
Authors: Pan Mingjie , Li Xiang , Xie Da , Zhao Chenghan 
Published: June 2021

Abstract
Aiming at the shortcomings of traditional photovoltaic modules in energy routers, a new structure of cascaded H-bridge photovoltaic module is designed in this paper, including photovoltaic cell module, Boost/Buck module with inertial energy links, and chain H-bridge module. The maximum power point tracking (MPPT) control algorithm and the chain cascaded H-bridge control algorithm are studied, and the control angle table of the full chain 12H-bridge and the missing chain 11H-bridge is given. A 12H-bridge cascade model is built in the EMTP simulation software to verify the feasibility of the H bridge cascade output and it proves that its harmonic content is small and the power quality is high. Finally, a chain cascaded photovoltaic panel is produced, showing that it can output AC power smoothly. Comparing the daily power generation of the new photovoltaic module and the traditional photovoltaic module, it proves that it has more power generation and better irradiance tracking performance.
Research on the Linkage Between the US and China Stock Markets in the Context of COVID-19 Based on the EMD Model
Authors: Wen Yunfa , Liu Xinghua 
Published: June 2021

Abstract
Using the COVID-19 and the Sino-US trade war as the background, the data of the stock markets in China and the US from March 1, 2017 to September 11, 2020 are divided into 3 phases, and the high-frequency return series are extracted by empirical mode decomposition algorithm, excluding the interference of the medium-frequency data and low-frequency data. The DCC-GARCH model is used to analyze the China-US stock market linkage in the 3 phases, and the results show that: both the China-US trade war and the COVID-19 have a significant impact on the China-US stock market linkage. The Sino US trade war makes the linkage of Sino US stock market decline in the short term, while The COVID-19 made the relationship between China and the United States present an inverted “U” shape of first rising and then falling.
Research on the Structure and Performance of Bimetal Composite Hammer
Authors: Zhang Mingyi , Gao Ping , Jia Xiaobin , Tian YingChun 
Published: June 2021

Abstract
In order to improve the service life of the hammer head of the crusher, the high chromium cast iron-medium carbon low alloy steel double liquid composite hammer head is used to replace the single material high manganese steel hammer head; the production process uses lost foam casting instead of sand casting. This article mainly studies the production technology of composite hammers from the aspects of hammer material selection, model making, pouring system design, pouring process and heat treatment process, and uses a metallurgical microscope to observe the bonding interface, and uses a scanning electron microscope to observe both sides of the interface. For element diffusion, the universal testing machine tests the interface combination. The results show that the composite hammer has a firm bonding surface and good bonding quality.
A Brief Introduction of Carbon Nanotubes: History, Synthesis, and Properties
Authors: Chen Junqi , Wei Shiqin , Xie Haoyan 
Published: June 2021

Abstract
Carbon nanotube (CNT) is one of the most widely used nanomaterials recently. Since it was discovered by Iijima in 1991, its various synthesis methods were being mature in the past 30 years. The research of carbon nanotube applications in different fields has never stopped. Since a number of researchers have tested the excellent properties of CNTs, it provides an optimistic expectation about CNT applications in the future. This review summarizes the historical development of CNTs, and briefly introduces three main CNT synthesis methods and their properties.
Study surface modified nanocellulose whiskers in coconut shell
Authors: Luo Haixi , Dou Wentao , Li Guijiuan 
Published: June 2021

Abstract
The nanocellulose whiskers degraded by coconut shell were modified by silane coupling agent (KH-570). The structure, morphology and dispersibility of modified nanocellulose whiskers were characterized and analyzed by infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscope (TEM) and sedimentation. The results showed that the modified nanocellulose whiskers have been changed from hydrophilic to hydrophobic, and could be dispersed uniformly in ethanol without agglomeration because silane coupling agent reacts with hydroxyl groups on the surface of nanocellulose whiskers. The study showed that the crystallinity of nanocellulose whiskers were decreased with the increase of the content of coupling agent. Experiment also indicated that both of dispersibility and crystallinity could reached optimism when the amount of coupling agent is 2%. Finally, the mechanism of chemical reaction of coupling agent modified nanocellulose whisker in coconut huskwas estabilished by comparison of molecular structure of KH-570, modification process and the infrared spectrum of nanocellulose whiskers.
Preparation and characterization of a novel galactomannan based bioink for 3D bioprinting
Authors: Wu Huaying , He Ning , Huang Yuting , Zhou Zheng , Han Xiaoxiao , Liu Hairong 
Published: June 2021

AbstractThe limited types of bioink significantly inhibit 3D bioprinting applied to tissue engineering. In this study, galactomannan (GM) was modified by a two steps modification method, by which GM was oxidized and then methacrylated. FTIR results showed that the two steps modification of GM is successful, and the prepared compound was named as OxGM-MA that was used to test whether it can be applied as a 3D bioprinting bioink. Compared with GM, the solubility of OxGM-MA increased and 4% (w/v) OxGM-MA solution was applied to further tests. This GM based bioink, the 4% (w/v) OxGM-MA solution, displayed a low viscosity, which is 8.5 mPa • and is able to solidified by blue light irradiation. Additionally, its light solidified hydrogel displayed a pore network structure with the compressive strength of 52.3±6.7 kPa, which is strong enough for tissue engineering operations. By carrying chondrocytes, the GM based bioink was printed into a hydrogel with designed shape, which was created with CAD software previously. Following bioprinting, chondrocytes within the printed hydrogel exhibited good viability during 3 days incubation with cell culture medium, indicating the good printability and biocompatibility of the novel GM based bioink. It suggested that the novel GM based bioink can be potentially applied to cartilage tissue engineering in the future.
Dendrimer Applications for Cancer Therapies
Authors: Yan Xintao , Yang Yefei , Sun Yuchen 
Published: June 2021

Abstract
Human cancer therapy is a major issue in modern medical science. Lots of emerging materials are developing rapidly. Dendrimers, as a nanocarrier, are now widely used in the field of biomedicine, pharmacy, and so on. As a super-branched macromolecule, dendrimers have a series of outstanding properties. Such as simple to functionalize, have nano & symmetric dimension and cavities for host-guest entrapment. It has made much progress in drug and gene delivery. Dendrimers have higher efficiency by perfecting the surface modification methods. The small molecules, DNAs, therapeutic agents, and more can be loaded into dendrimers. Also, the cytotoxicity is reducing gradually. This review aims to make a summary of dendrimers’ history and provide guidance for future research. This review gives a brief review of dendrimers’ properties, presents how dendrimers developed in drug and gene delivery, what drawbacks are remaining to resolve.
Enhanced phase stability of a BCC structure system high-entropy alloys by decreasing elastic distortion energy
Authors: Chen Songshen , Wang Liang , Wang Lu , Xue Yunfei , Wang Benpeng 
Published: June 2021

Abstract
Lightweight BCC high-entropy alloys exhibit outstanding specific strength. However, these alloys usually have poor phase stability, causing brittle precipitates. These precipitates would worsen the plasticity. In order to improve the alloy performance, it is important to improve its phase stability. In this paper, the phase stability of two kinds of BCC high-entropy alloys at 400°C, 500°C and 600°C is investigated. The contributions of mixing enthalpy and elastic distortion energy to their phase stability are discussed. Besides mixing enthalpy, elastic distortion energy also plays a significant role in phase stability. Our results prove that decreasing elastic distortion energy is an effective way to improve phase stability of typical BCC HEAs.
The Influential Factors of Baking Time in Internal Friction and Bake-Hardening Properties on Low Carbon Steel
Authors: Xiaolong Jin , Feiru Zeng , Rongsheng Sun , Rendong Liu 
Published: June 2021

Abstract
This paper aims at exploring the distinctive ways of baking time affecting the hardening degree of the cold-rolled steel. Therefore, with different time span, the annealed sample was baked to test its baking hardening properties. The sample was analyzed micro-structurally after being annealed, pre-deformed and baked. The internal friction was simultaneously measured in terms of different processing conditions during experiments. The following findings are the significant conclusion of the experiments: The important experiment result indicated that when the degree of pre-deformation setting at 5% and the baking temperature at 170°C, the BH value increased but remained unchanged afterwards. Furthermore, when the baking time span was set at 1000 minutes, the BH value reached the maximum but would remain unchanged afterwards. When the degree of pre-deformation was set at 5%, and the baking temperature was set at 17°C with baking time 20 minutes, the SKK peak reached the maximum. When the baking time was 1000 minutes and constantly extended, the height of SKK peak rarely changed. The above experiments are designed to better illustrate and understand the significance of the hardening steel properties for future application in the automobile industry.
Research on hybrid bounding box interference check algorithm for robot offline simulation system
Authors: Li Jing , Zhong Zhen , Fan ChangQi , Shen NanYan , Lu YiHao , Feng ZeYuan , Dai ZhenLiang , Yu Hong 
Published: June 2021

Abstract
Aiming at the problem that the traditional industrial robot may interfere with the workpiece when running in the offline simulation environment, a hybrid bounding box algorithm based on octree is proposed. First, AABB is used for rough interference checks, which quickly eliminates the pairs of impossible objects to intersect, then OBB hierarchical bounding box is used for precise interference checks. A new OBB construction method is proposed, which recalculates the semi-axis length and centre of the constructed traditional OBB to make it surround the object as much as possible and reduce the space gap. A traversal method based on distance priority is proposed, which traversed the closest node every time by maintaining a priority queue. And in the update strategy, “update on demand” is adopted, which discards updating the entire tree before each intersection and only updates the current node during the intersection traversal to achieve the purpose of partial update. Experiments show that the proposed hybrid bounding box algorithm can detect interference faster and perform better real-time performance and accuracy.
Synthesis and applications of silver nanocomposites: A review
Authors: Wu Chunyang , Xu Shengtao , Wang Wenmin 
Published: June 2021

Abstract
Nanomaterials refer to materials whose structural unit size is between 1 nanometer and 100 nanometers. Since nanoparticles’ size is close to the coherence length of electrons, their properties have also changed greatly due to the self-organization brought about by strong coherence. Therefore, noble metal nanoparticles have unique physical, chemical, and biological properties. This paper mainly studies the silver nanoparticle material, one of the precious metal nanoparticles. The silver nanoparticle is modified to graphene, metal materials, fiber materials, ceramic materials, and polymers to form a silver-based composite material, which improves its antibacterial, electrical conductivity, and Chemical durability, photocatalysis, and other capabilities. They can be applied to medical, environmental, industrial, biological, food and other fields, providing a reference for in-depth research on the properties of nano-silver particles and the continuous development of their application prospects.
Simulation and Practice of Guided Wave Test Method in Circular Rod
Authors: Peng Ding , Guangfei MA , Shudong Gong , Pengxiang YU , Bo Chen , Xiao Yang , Yanshan Song 
Published: June 2021

Abstract
Guided wave mode and dispersion curve in the circular rod are analyzed, and the time domain waveform of Φ20mm*2m circular rod is analyzed. Though finite element simulation and experiment, the variation law of reflection coefficient of different guided wave modes is analyzed. The L(0,1) is consistent with the change trend of F(1,1) modes for axial and circumferential defects, and the simulation results of L(0,1) modes are consistent with the test results.
Ground-mounted vs floating photovoltaic (PV) power plant: a trade-off using game theory in utility-scale PV power plant investment decision making
Authors: Nico Siagian Herry , Saputra Febriyadi 
Published: June 2021

Abstract
The development of a renewable energy power plant in Indonesia will increase rapidly in the future in line with the long-term electricity policy to achieve the renewable energy target of 23% by 2025. One type of renewable energy power plant that will be highly developed is the Photovoltaic (PV) power plant, both built on the ground or floating type. Floating PV power plants do not require large amounts of land. However, the construction of a floating PV requires a floater system along with mooring and anchoring, which costs up to 20-30% of the project cost. This paper aims to optimize and simulate the critical factors so that investors and utility companies can make a decision whether to build a PV power plant on land or floating in a used mine area. Critical factors that affected the PV power plant development are analyzed using Critical Success Factor Analysis. Furthermore, the analysis is carried out using Game Theory to obtain optimal decisions. Based on the analysis, if the other critical factors are assumed to be the same, the construction of a floating PV Power Plant in a typically used mining area will provide optimal commercial value at a depth of reservoir of fewer than 60 meters. If the depth of the reservoir is more than 60 meters, the ground mounted PV will provide a more optimal commercial value.
The effect of ultrasound duty cycle in biodiesel production from Ceiba pentandra
Authors: Iderisa Fazril , Susan Silitonga Arridina , Kusumo Fitranto , Halim Shamsuddina Abd , Nomanbhaya Saifuddin M. , Sebayang A. H. , Sutrisno J. , Bela N. 
Published: June 2021

Abstract
This study investigated the effect of the duty cycle for the transesterification of Ceiba pentandra oil. The important parameters of a duty cycle (pulse-mode operation) and energy usage in the transesterification reaction process were presented and showed that a maximum biodiesel yield of 99.24 % was achieved for 75% duty cycle with a pulse combination of 6 sec ON and 2 sec OFF. That was under the optimum conditions of 60% methanol to oil ratio, 1.00 wt% of KOH, reacted for 50 minutes. The obtained biodiesel was then analyzed using FTIR spectroscopy, and physiochemical properties of the Ceiba pentandra biodiesel then determined. It found that all the properties comply with the fuel specifications set by both ASTM D6751 and EN 14214 standards.
A facility location problem for palm-oil-based biodiesel plant: case study in North Sumatera Province
Authors: Silalahi Fitriani Tupa R. , Simatupang Togar M. , Siallagan Manahan P. 
Published: June 2021

Abstract
As a country that supports the development of renewable energy, Indonesia has policies to direct the use of biodiesel as fuel energy source. In 2020, the Government of Indonesia (GoI) implements mandate of biodiesel from palm oil, one of Indonesia’s best plantation products. The increase in the mandate up to B30 makes the national biodiesel plant’s capacity to operate up to 80% so that a new plant is needed to meet biodiesel for national and export demand. Taking North Sumatra province as the location of study, this research expects to determine the biodiesel plant’s location that will be built to meet the needs of petrodiesel fuel in the North Sumatra area to minimize transportation costs at each stage. Mathematical modelling is conducted to reach the objective. The model aims to determine the most appropriate location and size of the biodiesel plant to be made, by taking into account the distance between several two-transportation points, the availability of feedstocks, demand, and supply chain costs. Mixed-integer linear programming (MILP) is employed to simulate the model. Result suggests that two regions are suitable locations for establishing biodiesel factories to meet the needs of the people of North Sumatra, namely Langkat Regency and Serdang Bedagai Regency. The result can serve as recommendations for policymakers to minimize the biodiesel supply chain cost in North Sumatra.
The implementation of energy diplomacy by sub-state actors: approaches of Surabaya toward Kitakyushu
Authors: Rudiany N P , Anggraeni S D , Firmansyah M , Nurhidayah G M 
Published: June 2021

Abstract
In many countries, energy diplomacy is usually carried out by the national government as the primary unit, through bilateral or multilateral agreements. However, it seems that Surabaya and Kitakyushu’s cities have carried out intensive cooperation in the energy sector since the 2010s. This condition shows that the implementation of energy diplomacy has also been conducted at the substate level. Even though it focuses on the active role of the two cities, the meaning of energy diplomacy has not disappeared, but instead, it has expanded. This paper analyzes the City of Surabaya, Indonesia, approaches toward the City of Kitakyushu, Japan, in developing the energy sector, especially to strive for an energy-efficient city planning system in Surabaya. This paper’s analytical framework is based on energy diplomacy and diplomacy by sub-national actors in international relations. The finding of this study is that the diplomacy carried out by the City of Surabaya toward Kitakyushu is classified as a practice of energy diplomacy. The diplomacy is carried out through a sister city approach.
Bioenergy Sustainable development in Indonesia and its relation with SDGs goal
Authors: Harahap Fumi 
Published: June 2021

Abstract
The global Sustainable Development Goals (SDGs) are now converging to address the economic, social and environmental dimensions. Bioenergy can play a significant role in achieving the agreed SDGs on climate change, thereby advancing climate goals, food security, better land use, and sustainable energy for all. Bioenergy is essential in the past, present and future energy systems. At least 10% of global energy supply comes from bioenergy source, of which two-thirds is used in developing countries for cooking and heating. Compared to other renewable energy sources, bioenergy is the most problematic area due the multitude of biomass feedstock, technology pathways, and end products which encompass the biomass to energy conversion. The use of biomass for bioenergy is expected to increase driven by several SDGs (goals: 2, 7, 8, 9, 11, 12, 13, 15), but bioenergy also act as sustainability safeguards. By exploring bioenergy in a context of multi-sectoral objectives and synergies, pathways can be found to promote the transition to sustainable modern bioenergy. This paper explores pathways to enhance resource efficiency, particularly for bioenergy production in the palm oil industry in Indonesia for meeting the SDGs.