bluuebunny/crossref_metadata_2025_split huggingface dataset:
In vitro selection to increase Huanglongbing tolerance of citrusderived from in vitro breeding
Authors: Kosmiatin M , Martasari C , Yunimar  , Akhdiya A , Husni A 
Published: March 2020

Abstract
Until now, Huanglongbing-HLB disease caused by a simple bacterium (Ca. Liberibacter spp) and distributed by Asian citrus psyllid vector (Diaphorina citri) and clonal propagation (grafting), was a major challenge in the national citrus production even almost all citrus nation production center in Asia, Africa also at the USA. This disease attack at phloem vessels by callouses forming that covering plasmodesmata and could be crop failure. There have been no citrus varieties reported resistant to HLB attack. Plant ploidy increase derived from in vitro breeding through somatic hybridization and endosperm culture expected to increase the plant’s defense system. The aim of this study was to evaluate the tolerance of polyploidy plant to HLB attack. Tolerance of in vitro shoot of citrus regenerated from protoplast fusion (Citrus nobilis + C. unshiu) and culture of tangerine (C. nobilis) endosperm were screened by HLB pathogen suspense as selecting an agent and local lime as a negative control (HLB susceptible citrus). In vitro selection result that in vitro shoots derived from somatic hybridization shows resistance increase to HLB and characterize by recoverability after were selected.
Phase Transformation in ξ-Al-Ni-Rh Approximant Phase Induced by Electron Irradiation by In-situ TEM
Authors: Zhai Yadi , Chen Yanhui 
Published: March 2020

Abstract
Electron beam irradiation induced phase transition processes were studied on crystalline approximant phase ξ-Al-Ni-Rh in Al75Ni15Rh10 alloys. Approximant phase to amorphous transition phase occurred under different density of electron beam irradiation. Phase transition and separation occurred in a comparatively lower density of electron beam due to defects modulation and defects play an important role in this process. Higher density electron beam induces hollow holes with amorphous phase in the rim of the hole in the sample and face centered structure transition phase with parameter of 2.2 Å appears between the amorphous phase and ξ-phase. The appearance of the face centered structure indicates that it is the most possible shortest-range order in amorphous phase.
Effect of ZrB2 Addition on Sintering Temperature and Densification of Vacuum-Fused NiCr/WC Cermet Coating
Authors: Yu Z X , Meng J , Sheng X C , Le J 
Published: March 2020

Abstract
NiCr/WC cermet coatings were fabricated by vacuum fusion sintering on the surface of nickel-base alloy at 1220 °C. The sintering temperature, densification mechanism and oxidation resistances of the cermet coating with ZrB2 additive were investigated using thermogravimetric and differential thermal analysis method, theoretical calculation of phase diagram with the FactSage software, X-ray diffraction, and scanning electron microscopy. The sintering temperature of NiCr/WC cermet coating with ZrB2 additive decreased 123 °C and obtained the dense cermet coatings. The densification mechanism of NiCr/WC cermet coating added ZrB2 is mainly attributed to the reaction occurred between Ni and ZrB2 and the ample liquid phases formed at 1220 °C. The surface of the WC particles is coated by CrxCy and surrounded by NiCr alloy result in the better oxidation resistance of the cermet coating added with ZrB2.
Experimental Research of Activated Carbon on Adsorption of Oil Vapor
Authors: Zhang Hongxing , Lin Y , Yin S M , Shan X W 
Published: March 2020

Abstract
The adsorption properties of pillared activated carbon (PAC) on the oil vapor were studied through physical characterization and the dynamic adsorption measurement. The PAC was a typical microporous material with the well-developed interstitial structure and appropriate to be used as adsorbent for recovering of oil vapor. The influence factors of the ambient moisture, the inlet concentration, and supplying velocity on the adsorption amount of oil vapor were investigated using simulation device. During the first adsorption stage, the adsorption amount of oil vapor and the adsorption layer temperature increased remarkably with time, while the adsorbed vapor was relatively difficult to remove as using the vacuum pumping. A competitive adsorption between water and the hydrocarbon molecules reduced the adsorption performance of the PAC. When the supplying velocity increased, the adsorption amount of oil vapor on the PAC decreased for the shortening of contact time.With the increase of inlet concentration, the adsorption amount of oil vapor increased, while the adsorption time decreased.
Electrical Resistivity and Structure of Cu-Pb Alloy during Cooling Process
Authors: Hou J X , Zhang H J , Zhang S H 
Published: March 2020

Abstract
The variations of electrical resistivity and cooling curve for monotectic Cu-Pb alloy have been measured from liquid state to ambient temperature. The structural transitions were discussed during cooling process. And the correlations between the variations of electrical resistivity, heat and structural transitions were also investigated. The linear relationship between the electrical resistivity and temperature curves in liquid state means there is no structural change in liquid Cu-Pb alloy. And during the solidification process, the electrical resistivity and cooling curves change with the occurrence of new phases.
Equal Load Carrying Capacity Design of Butt Joints Based on Plastic Limit Loads
Authors: Guo Junli , Dong Zhibo , Fang Hongyuan 
Published: March 2020

Abstract
In order to reduce the weld size of weld joints designed based on equal load carrying capacity (ELCC) further, the shape of under-matching butt joints is designed with the parameter of plastic limit loads. The realization condition of ELCC is that the plastic limit loads of the weld equals to that of the base metal. Through analysing the tensile/bending load carrying capacity of weld zone, the weld shape was determined, and the method of tensile/bending ELCC design for butt joints is given. The ELCC joints are designed and their elastoplastic finite element analyses are carried out to verify their load carrying capacities. The tensile ELCC joint fractures at the base metal in the mode of overall yield fracture and its load carrying capacity reaches the tensile strength of the base metal. The load carrying capacity, deformability and stiffness of the bending ELCC joint are better than that of the base metal. The results indicate that the joints with acceptable size meet the requirements of ELCC, which is of great significance to the application of ELCC joints.
Spectral Analysis on the Nickel Hydroxyl and Deuteroxyl Nitrate Powders
Authors: Liu Xiaodong , Fu Jianlong , He Songya , Meng Huamao 
Published: March 2020

Abstract
Infrared absorption (4000-400 cm−1) and Raman (4000-50 cm−1) spectra of the magnetic geometrically frustrated compound nickel hydroxyl nitrate (Ni2(OH)3NO3), and incompletely deuterized nickel hydroxyl/deuteroxyl nitrate (Ni2(OH/D)3NO3) powders, which were synthesized successfully by the hydrothermal methods, have been measured at room temperature and analyzed in four spectral regions (the [OH/D] and [NO3] functional group regions, the [OH/D] and [NO3] correlation peak region and the Ni-related fingerprint region) by referring to the spectral assignments of the layered β-Ni(OH)2 and β-Ni2(OH)3Cl. The spectral analysis can be beneficial to analyzing their low temperature spectral properties, which can help to understand the underlying physics of their exotic quantum phenomena at low temperatures from the spectroscopic point of view.
Synthesis and Characterization of Novel Fluorosilicone Triblock Copolymers
Authors: Cheng Xitao , Tang Xuan , Huang Fangfang 
Published: March 2020

Abstract
Novel fluorosilicone triblock copolymers poly (2, 2, 3, 4, 4, 4-hexafluorobutyl methacrylate)-block-poly(dimethylsiloxane)-block-poly (2, 2, 3, 4, 4, 4-hexafluorobutyl methacrylate) (PHFBMA-b-PDMS-b-PHFBMA) were synthesized by atom transfer radical polymerization (ATRP). The optimum reaction conditions were also studied in the work. The structure and composition of the copolymers were analyzed and identified by infrared spectroscopy (IR), nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC). The effects of the fluorine and silicone content on the hydrophobic and oleophobic properties of prepared triblock copolymers were also investigated. The results showed that the prepared triblock copolymers had excellent hydrophobic and oleophobic properties.
Creep Properties of 12Cr1MoVG Material at High Temperatures
Authors: Pan Jinping , Zhu Chaoming , Zhu Xinwei , Tan Lianjiang 
Published: March 2020

Abstract
Heat-resistant steels play a pivotal role in the construction of boilers and high-temperature pipes. Herein, the creep properties of 12Cr1MoVG steel at high temperatures have been studied. Creep tests at high temperatures over a 20000 h period were done for 12Cr1MoVG steel samples. Creep curves were examined to unveil the creep properties of the 12Cr1MoVG steel. Moreover, Manson-Haferd model (M-H model) was chosen to study the creep behavior, whose results showed that the model prediction data were in perfect accordance with those from creep experiments. This work provides a new perspective for modeling and evaluation of long-lasting creep properties under the condition of high temperatures.
Electronic Structure and Polarization of NaMgF3/NaCaF3 Superlattices: Insight from First-Principles
Authors: Sun Xuewei , Wang Guiqiu , Yang Kun 
Published: March 2020

Abstract
Employing First-principles calculations, we have studied the electronic structure and polarization properties of the fluoroperovskite NaMgF3/NaCaF3 superlattices. The in-plane lattice constants of the superlattices are found to lie between those of the bulks. The Berry phase calculations show that the polarization of the NaCaF3 bulk is much larger than that of the NaMgF3, and the polarization of the NaMgF3/NaCaF3 superlattices can be tuned by altering the stacking periodicity. The band structure dependence of the stacking period is also investigated.
Charcteristics and Mechanism Study of the CuO/γ-Al2O3 Modified by CeO2 and NaCl
Authors: Zhang Qi-Long , Dong Yong , Cui Lin 
Published: March 2020

Abstract
The CuO/γ-Al2O3 absorbent was modified by CeO2 and NaCl, and its desulfurization performance was studied experimentally in a fixed bed reactor. The experimental results show that the adsorption capacity of sulfur dioxide is significantly improved and the adsorption saturation time of sulfur dioxide is significantly extended with CeO2 and NaCl addition. The sulfur dioxide adsorption saturation time of the absorbent can be extended from 56 minutes to 78 minutes at 400°C, When the CeO2 loading is 3%, and can be further extended to 104 min, with 2% CeO2 and 5% NaCl loading. The improvement mechanism of the desulfurization performance of the modified CuO/γ-Al2O3 can be attributed to the promotion of the uniform distribution of the active components in the carrier and the optimization of the pore structure of the absorbent.
Highly Efficient Solar Hydrogen Evolution by Photoelectro-Chemical Water Splitting over ZnFe2O4-ZnO Heterojunction
Authors: Yang Meijun , Zhang Yan , Cheng Rui , Sun Jun , Peng Yanhua , Yu Jianqiang 
Published: March 2020

Abstract
ZnFe2O4-ZnO heterojunction thin-films were fabricated by the composite photocatalyst, which was first synthesized by a freeze-drying process and followed by a simple chemical bath way in the condition of low temperature. The ZnFe2O4-ZnO heterojunction thin-film exhibited high efficiency to get hydrogen with photoelectrochemical method under visible-light irradiation. The property with photoinduced charge-transfer of p-type ZnFe2O4 was improved significantly by Cooperating with n-type ZnO. The heterojunction at the interface between the ZnO and ZnFe2O4 efficiently reduced the recombination of photoinduced electron-hole pairs, and thus increasing the lifetime of charge carriers and enhancing the phototo-current efficiency of the ZnFe2O4-ZnO heterojunctions. It was found the heterostructure between two different kinds of semiconductors is important in affecting the dynamic properties of the photo-to-current conversion efficiency and their photogenerated charge carriers.
Mechanical Characteristics Generated by Solidification Crack During High Strength Steel Welding
Authors: Li Z M , Chen Z L 
Published: March 2020

Abstract
A multiscale method was developed to elaborate weld solidification crack mechanical field. A sequential thermo-mechanical finite element method (FEM) of butt-joint was performed to provide both of geometry and loading condition of submoel. Then mechanical behaviours generated by impurity was achieved by submodelling with embedded solidification cracks in terms of elasto-plastic FEM. The solidification initial cracks were geometrical discontinuity in nature and modelled as mechanical property discontinuity. Results show that additive stress and back stress are built-up at impurity-weld matrix interface. The developed modelling method was validated by solidification crack tests, X-ray tests together with fractography. The underlying mechanisms in suppression solidification cracking by adjustment of alloy contents in flux cored wire aiming to diminish the impurity size and improve the ductility of weld metal were revealed by developed method. Results show that, given a 9 percent increase of the weld metal ductility, a 29.6 percent decrease of the additive stress is achieved; and the longitudinal oriented impurity readily propagates crossing section rather than along impurity longitudinal tip. The susceptibility to cracking is distance-dependent, heavily on fields near to impurity and little on far field.
Study on Preparation of Fluorinated Photosensitive Copolymer and Surface Wettability Light Regulation
Authors: Chen Xu , Xu Lin , Yang Xiaoyu , Zhang Lin , Liu Tongtong , Zong Chuanyong , Zhang Shuxiang 
Published: March 2020

Abstract
Low surface energy and micro/nano structure are two key factors affecting the construction of hydrophobic surfaces. In this paper, a series of tetrafluoropropyl methacrylate (TFPMA) and 6- [4- [2- [4- (trifluoromethoxy) phenyl] diazenyl] phenoxy] hexyl acrylate (FAzo) random copolymer [P(TFPMA-co-FAzo)] of different monomer molar ratios were prepared by free radical solution polymerization; and the chemical structure of the copolymer was characterized in detail using FTIR and 1HNMR. The introduction of long-chain flexible acrylate components with high fluorine content can effectively reduce the surface energy of the material. When the molar ratio of TFPMA is increased to 70%, the static water contact angle on the surface of the copolymer film is increased to 90°. By doping 10 wt% micron-sized PTFE particles, the water contact angle on the surface of the copolymer film can be further increased to 105°; Meanwhile, based on the cis-trans isomerization reaction of the azobenzene component in the copolymer, light irradiation with different wavelengths can realize the rapid and reversible regulation of hydrophobic/hydrophilic properties on the surface of copolymer film. This method of combining low surface energy fluorine-containing component with photosensitive azobenzene to construct light-responsive hydrophobic surface has a good research prospect.
Formulation Design of Deep Watertight Connector
Authors: Yu Kaiben , Wang Honghao , Zong Le , Meng Qingjian , Yu Shengqi , Zhang Xiaobo 
Published: March 2020

Abstract
In order to make the watertight connector localized, this paper mainly studies the outer insulating material neoprene 2442 (CR2442) of the watertight connector from the material, and improves the physical and mechanical properties of the CR2442 and the adhesion of the CR2442 to the brass by designing the formula. The performance and finalization of the watertight connector molding and vulcanization molds are designed to meet the molding needs of watertight connectors. Through research, it is found that the CR2442 optimized by this paper has good physical and mechanical properties and adhesive properties.
Wear Prediction Model Based on the Fractal Contact Characteristics
Authors: Yun Rui-De , Ding Bei 
Published: March 2020

Abstract
A new fractal wear model is proposed. The new model is based on the multi-scale fractal contact model. Studying the elastoplastic and plastic state of contact asperities, the new wear model is established. The relationship between the amount of contact surface wear and the fractal dimension D, the characteristic coefficient G and the material property constant C is studied. Besides, wear coefficient of the rough contact surface is predicted. It can be seen from the results that the influence of the scale effect on contact surface must be considered, because of the asperities with the same deformation ?? will be in different contact state. The relationship between amount of wear in the new model and amount of wear in existing model has the same trend. When D = 1.45, the amount of wear is the lowest. With the increasing of G reflecting the roughness of contact surface, the wear amount is increasing. The material constant also has a certain influence on the wear amount, and the material with high hardness has low wear. The contributions of the amount of asperity wear (elastoplastic and plastic) have the same effect to the total wear amount. Besides, the result of new fractal wear coefficient and the result of classical have the same trend, however, the new wear model is more precise than the classical wear model and closer to the actual state.
Study on the Material Mechanical Properties of Aquaculture Net Cage
Authors: Liu Haiyang , Wang Shaomin , Yuan Taiping , Hu Yu , Huang Xiaohua 
Published: March 2020

Abstract
Due to the typhoon impacts, aquaculture net cages may be exposed to the risk of structural failure as a far-reaching aquaculture equipment. In addition, the fatigue problem of key components due to long-term marine alternating loads can not be ignored. The method is developed independently on processing samples of cage for testing its performance parameters, among which the fatigue Wohler curve is S = -1.022ln (N) + 22.201. By adapting the following methods: Mechanical test, Equivalent load finite element simulation and Full field finite element simulation respectively is verified each other, and the error is less than 5%. The key nodes of the stress concentration of the floating frame are mainly the welding point, the mooring point and the edge area of the I-beam frame at both sides. The damage of the cage which caused by tensile and bending loads should be considered at the same time. And the tensile strength 22.12 MPa and the bending strength 30.58 MPa could be taken as the evaluation standard for the elastic to plastic deformation. Structural fracture occurs when the elongation at break exceeds 340.18%. The fatigue of the cage is mainly because the stress is much greater than the fatigue limit 3.38 MPa. The material model test combined with structural mechanics simulation provides the basis for guiding the structural optimization design of the cage.
Ferrosilicate Hydroxide/Carbon Nanotube Material for Anode of Lithium Batteries
Authors: Jiang Xiaotong , Lu Pengyi , Hou Feng 
Published: March 2020

Abstract
A ferrosilicate hydroxide/carbon nanotube composite was prepared by a combination of floating chemical vapor deposition and hydrothermal method as a lithium-ion battery anode. The obtained film material has a capacity superior to that of the conventional graphite negative electrode, and has a reversible capacity of 569.5 mAh g−1 at 0.05 A g−1. The material has excellent rate performance and cycle stability. The material can still maintain a capacity of 178.5 mAh g−1 after 500 cycles under a high magnification of 3 A g-1, with a coulomb efficiency is 95-100%.
Equivalent Performance Analysis of Thermal-Mechanical of 3D Lattice Structure
Authors: Bai Yang , Wei Liang 
Published: March 2020

Abstract
In order to achieve the efficient and accurate thermal stress analysis of 3D lattice structure, basing on the principles of statics and thermodynamics, the elastic modulus and thermal conduction equivalent calculation formula of the lattice structure are deduced. The theoretical relationship between the relative elastic modulus, relative thermal conductivity and relative density of equivalent cells is obtained. Finally, the numerical simulation method is used to compare the simulation results and experimental results of the equivalent model and the meticulous model, and the efficiency and accuracy of the equivalent model mechanical analysis and heat conduction analysis are proved. On this premise, designers can quickly determine the size and thermodynamic properties of lattice cells when using a multi-layer pyramid structure. And this research lays the foundation for the rapid analysis of structural thermo-mechanical coupling.
Optimization of Preparation Method of Molecularly Imprinted Microspheres by Uniform Design
Authors: Zhou Qiang , Zhang Hong , Wang Yanhong 
Published: March 2020

AbstractThis work presented a simple and effective method for the preparation of molecularly imprinted microspheres (MIMPs) through multi-step swelling polymerization. To prepare carbofuran MIMP with a uniform size, the experiment of optimizing the dosage of reagents which used during synthesis based on uniform design (UD) method was performed. Six kinds of factors, namely methacrylic acid (MAA, functional monomer), ethylene glycol dimethacrylate (EGDMA, cross linker), polyvinyl alcohol (PVA, dispersant), dibutyl phthalate (DBP, sweller), polymerization temperature and polymerization speed were taken into account based on UD to perform the optimization experiment. The micromorphology of MIMP was characterized by scanning electron microscopy (SEM) and it showed that the particle sizes were between 6-8 μm. The results indicated that MIMP possessed good selectivity and specificity for carbofuran, which was an excellent material for adsorption and testing of carbofuran residues in food and environment.
Preparation of Chiral Stationary Phase by Dynamic Grafting BSA on the Organic-Silica Hybrid Monolithic Column Based on Schiff-Base Reaction
Authors: Sun Yue-Na , Li Pan , Chen Meng-Jiao , Lv Yun-Kai 
Published: March 2020

Abstract
The prepared hybrid monolithic column (HMC) with epoxy groups on the surface was reacted with polyethyleneimine, and then reacted with glutaraldehyde. The chiral monolithic column was prepared by dynamically grafting bovine serum albumin (BSA) onto the newly modified HMC by Schiff-base reaction. The obtained chiral monolithic column was characterized by SEM and IR. The effects of the concentration of the BSA solution, flow rate and grafting time on the grafting amount were optimized. The properties of chiral monolithic column were tested with benzoin as the chiral object. The results showed that the obtained grafting amount of BSA was 56.1 mg/g under the optimized conditions. The chiral monolithic column had homogeneous network skeleton structure and good reusability. The method of preparing chiral monolithic column had good reproducibility.
Research on the Restricted Growth of High-Quality Large Cubic Gem Diamond Crystals
Authors: Zhang Li , Chen Kui 
Published: March 2020

Abstract
In this paper, cubic gem diamond crystal was grown via the temperature gradient under high pressure and high temperature, with self-made alloy solvent and through adjusting the process of assembling and synthesis appropriately. Crystal characters of large hexahedral cubic diamond crystals grown during different times were researched, and the results show that, the radial growth rate of the synthetic crystal is larger than that of the axial growth rate under the experimental conditions. The radial growth rate of the synthesis of the crystal is 3.75 times than that of the axial growth rate within 20 hours. The synthesized high quality diamond crystal has cubic hexahedral morphology and high repeatability, which will be beneficial to the industrialization of high quality cubic hexahedral diamond crystal.