bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and Characterization of Neopentyl Glycol/Epoxy Resin Shape-Stabilized Phase Change Material for Thermal Energy Storage
Authors: Meng Duo , Zhao Kang , Wang Anqi , Zhao Wei 
Published: January 2020

Abstract
Neopentyl glycol is a kind of solid-solid phase change material for thermal energy storage. In order to overcome volatilization weight loss caused by the high saturated vapor pressure of neopentyl glycol, epoxy resin was chosen as the encapsulation matrix to inhibit the volatilization of neopentyl glycol when it happens phase change or works in a relatively high temperature environment. The micro morphology analysis indicated that the neopentyl glycol was encapsulated evenly in the epoxy resin matrix. These two components had no chemical reactions and combined with each other by the physical encapsulation. Phase change temperature and latent heat of the composite was measured as 41.26°C and 57.04 J/g respectively, which proves the thermal heat storage performance of the neopentyl glycol was not influenced by the adding of epoxy resin. Meanwhile, attributed to the effective encapsulation and protection by epoxy resin, volatilization weight loss of the neopentyl glycol in the composite decreased significantly and behaved good thermal stability and reliability. After 100 times thermal cycling test, the composite hardly changed in the thermo-physical properties. Thus, the prepared neopentyl glycol/epoxy resin composite phase change material is supposed to be a potential and promising functional material for the applications in low temperature building energy conservation and solar energy storage.
Magnetism of Undoped ZrO2 Nanoparticles Deposited by Plasma-Gas-Condensation Technology
Authors: Zhou Wenxin , Lin Kangqi , Wang Laisen , Luo Qing , Peng Dongliang 
Published: January 2020

Abstract
The magnetic properties of undoped ZrO2 nanoparticles (NPs) deposited by plasma-gas-condensation technology were studied. The as-prepared ZrO2 NPs with controllable particle sizes (6-13 nm) presents tetragonal phase which was hardly acquired by traditional methods at room temperature. The as-deposited ZrO2 NPs were annealed at 300 to 1000 °C in air or mixed gas of Ar (95%) + H2 (5%) for 3 h, respectively. XRD results show that the phase of ZrO2 NPs gradually transformed from tetragonal to monoclinic with increasing the annealing temperature. The magnetic results of ZrO2 NPs under all annealing treatments were paramagnetic, which are different with the diamagnetic or ferromagnetic ones, also different from magnetic property changed after annealing in some other works.
Effect of Rolling Processing on Mechanical Properties of Material Cr12
Authors: Liu Yichen , Li Taoyuan , Zhang Haiquan , Guo Peiquan 
Published: January 2020

Abstract
The rolling process changes the mechanical properties of the specimen’s surface material, and it also directly affect the fatigue strength and service life of the workpiece. The effects of rolling parameters on surface residual stress, microhardness, surface roughness and surface microstructure are studied by rolling test of Cr12 specimens. After rolling, the residual stress on the surface of Cr12 specimens changes from tensile stress to compressive stress, and the maximum compressive stress is -216MPa. With the increase of contact stress and rolling passes, the residual compressive stress increases at first and then remains stable. Rolling processing can effectively improve the surface hardness of specimens up to 30%, and the surface roughness can be reduced by 25%-67%. The fine grains aligned with the rolling direction, and the 50-60 μm grain refinement layers were observed, which resulted in the changes in the surface mechanical properties of the specimens.
Synthesis and Adsorption Properties of Insoluble Starch Xanthate (ISX)
Authors: Li Haihua , Zhang Lihui , Gao Yuhua , Liu Zhenfa 
Published: January 2020

Abstract
Starch xanthate was synthesized from corn starch and CS2 under alkaline condition. The effects of catalyst dosage, CS2 dosage and reaction temperature on sulfur content and copper ion removal rate were studied by single factor experiments, and the structure of the product was characterized by FTIR, SEM and XRD. The results showed that the optimum synthetic condition of ISX was NaOH dosage 16 mL, CS2 dosage 2.5 mL, reaction temperature 35 °C and reaction time 2 h. The sulfur content of ISX synthesized under this condition was 7.54%, the removal rate of copper ion was 90.5%, and the adsorption capacity of ISX was 90.0 mg/g.
Regenerated Bamboo-Derived Cellulose Fibers/RGO-Based Composite for High-Performance Supercapacitor Electrodes
Authors: Wang Tianhao , Zhang Wentao , Yang Shujuan , Tian Weiqian , Zhang Liping 
Published: January 2020

Abstract
Bamboo-derived cellulose fibers/RGO carbon aerogel composite was prepared by using a facile aerogel-based method, in which bamboo pulp fibers were dissolved and incorporated in an ionic liquid system, and RGO was introduced by thermal reduction approach. The obtained bamboo-derived cellulose fibers/RGO carbon aerogel composite shows a large specific surface area, and excellent electrochemical performance. When the GO content was 2.5 wt%, the obtained composite showed a high specific surface area of 1957 m2/g, and high specific capacitance of 351 F/g in 6 M KOH electrolyte solution even with a more than 90% capacitance retention at a high scan rate of 200 mV/s. The bamboo-derived cellulose fibers/RGO composite electrodes show the low equivalent series resistance of 5.0 Ω and small charge transfer resistance of 0.30 Ω which further demonstrate the excellent electrochemical behaviors.
Comparison in Chemical Composition of Lime Binders between Several Typical Ancient Buildings in China
Authors: Zhao Peng , Zhang Xiuzhi , Qin Lei , Zhang Yunsheng , Ren Hongwei , Lv Yinghui , Liu Gengle 
Published: January 2020

Abstract
This paper aims to compare the chemical and phase compositions of lime binders in ancient buildings. To this end, X-ray diffractometer (XRD) and FT-IR testing were used to analyse the representative samples by sampling the lime-based binding materials of several typical ancient buildings in China. The test results showed that the lime binder contained residual glutinous rice amylopectin; just because of this inorganic and organic synergistic effect of glutinous rice and lime can the lime binders have excellent properties. This provides a theoretical basis for the subsequent study.
Design of A Drive Scheme for Untethered Magnetic Manipulation Polishing
Authors: Zhou Xiaoqin , Wang Haocheng , Sun Baoquan , Wang Yifei , Wu Xiaoyang 
Published: January 2020

Abstract
Based on the untethered magnetic manipulation polishing device, this paper proposes a reasonable driving scheme, which makes the teleoperation process of the device more stable and easy to implement. The change of the position of the external permanent magnet can drive the internal polishing tool to produce corresponding changes. The comparison is made between the axial and radial driving modes, and finally the axial driving mode is selected for control.
Seismic Risk Probability Assessment of Frame Structures Based on Incremental Dynamic Analysis
Authors: Yang Beibei , Wang Zhitao , Ma Donghui 
Published: January 2020

Abstract
To assess the seismic risk probability of frameworks in different seismic fortification intensity zones in China, three fortification intensity framework models-specifically, 6 (0.05 g), 7 (0.1 g), and 8 (0.2 g)-were established as the research objects. The incremental dynamic analysis method was used to conduct a structure seismic fragility assessment, in which the fragility curves as well as the damage probabilities under certain peak ground accelerations were obtained. The risk probabilities of all the seismic damage levels of the frameworks in the next 50 years were calculated using the Monte Carlo method based on a study of the seismic hazard of different fortification intensity zones. The results indicate that, in the next 50 years, the risk probabilities of fortification intensity framework models 6, 7, and 8 exceeding “serious damage” were 1.92, 4.25, and 8.28%, respectively. Additionally, the risk probabilities of the models having a damage degree of “collapse” were 0.14, 0.43, and 1.07%, respectively. Based on the risk probability of the structure, the risk level is classified. This study forms the basis for the comprehensive evaluation of building seismic damage risk and can be used as a reference for the development of building seismic disaster prevention countermeasures.
The Super-hard Cutting Tools’ Thermal-cracks Monitoring System Based on Multi-agent Technologies
Authors: Guo Caifen , Dong Zhi 
Published: January 2020

Abstract
A thermal crack monitoring system of super-hard cutting tools was set up based on agent technologies. The system structure was designed, together with each agent’s workflow, inter-relationship among agents, and their communication mechanisms. If working properly, the system would realize the following functions, data collecting and retrieving, crack conditions monitoring, and resources state inspection and management.
Design and Implementation of a New Circuit Maintenance Training Platform
Authors: Zhou Zelong , Shao Xichun , Yang Zhuo , Zhu Xiaochun 
Published: January 2020

Abstract
This paper designs a circuit maintenance platform for the artillery system. It can read or simulate the important node data of the artillery system in real time online or offline, and provide the basis for the artillery maintenance inspection. It can also be used as a daily teaching operation demonstration platform; analog data detection read and fault demonstration process.
Development Model and Analysis of Single Well Circulating Shallow Geothermal Energy Based on Mathematical Modeling
Authors: Yu Liwu 
Published: January 2020

Abstract
Shallow geothermal energy has been used as an important energy because of its wide distribution, large reserves, rapid regeneration and high utilization value. As a new exploitation method of shallow geothermal energy, single well circulation has been widely concerned. In this paper, the mathematical model of single well circulation mining mode is analyzed from the point of view of mathematical modeling, and the practical problems encountered in the process of single well circulation mining are considered by using concepts of conceptual model, mathematical equation and numerical calculation method, and hydrogeology and hydrodynamic process are considered by assigning specific constants and variables. The influence of heat and mass transfer on geothermal energy exploitation. Based on the above model, the problems encountered in shallow geothermal exploitation are analyzed and discussed in depth, and the corresponding conclusions are drawn. To solve the current problems encountered in shallow geothermal energy exploitation, and provide a theoretical basis for the future development and utilization of new energy.
Modeling and Simulation Analysis of Pre-Valve Compensation of Flow-saturated Resistant System
Authors: Luo Yanlei , Chen Wang , Chi Baokun 
Published: January 2020

Abstract
The load-sensing pre-valve compensation technology is widely used in the single-pump multi-acting mechanism composite motion circuit. Due to the use of multi-valve inlet valve front compensation, its structure is simple, only need to set a two-way fixed-rate valve, but the flow saturation conditions cannot be automatically adjusted. Through an in-depth theoretical analysis of the anti-saturation mechanism, composition and control strategy principle based on automatic flow reduction (AVR), the AMESim model of the system is established, and the anti-flow-saturation output characteristics of the system are obtained under different operating conditions by numerical simulation means, and the results show that the system can solve the problem of flow-saturation. It provides some technical reference for the design of the load-sensing pre-valve compensation system.
Research on A New Type Topology of 4-Quadrant Converters
Authors: Pan Dawei 
Published: January 2020

Abstract
In consideration of the demerits of the traditional four-quadrant converter whose operating voltage of the dc side is very high, a new type topology converter is proposed whose topology belongs to quasi-buck topology and the voltage of the dc side is reduced by about 50%. Therefore this kind of four-quadrant can be used in the lower voltage filed. The modelling of the converter is described in this paper. The validity of the converter topology and the model along with the theory is proved by MATLAB simulation and the experiment result.
Energy levels of graphene magnetic circular quantum dot
Authors: Belouad Abdelhadi , Lemaalem Bouchaib , Jellal Ahmed , Bahlouli Hocine 
Published: January 2020

Abstract
We study the energy levels of graphene magnetic circular quantum dot surrounded by an infinite graphene sheet in the presence of an electrostatic potential. We solve Dirac equation to derive the solutions of energy spectrum associated with different regions composing our system. Using the continuum model and applying boundary conditions at the interface, we obtain analytical results for the energy levels. The dependence of the energy levels on the quantum dot radius, magnetic field and electrostatic potential is analyzed for the two valleys K and

K
′

. We show that the energy levels exhibit characteristics of interface states and have an energy gap.
Optimization of processing parameters and its effect on the mechanical properties of recycled low density polyethylene composite reinforced with Tetracarpidium conophorum shell particulates
Authors: Okeke P E , Atuanya C U , Umembamalu J C 
Published: January 2020

Abstract
This work explored the effect of African Walnut Shell Particle (AWSP) (Tetracarpidium conophorum) on the properties of recycled low density polyethylene (rLDPE) composite. rLDPE/ AWSP composite were prepared via compressive moulding techniques using AWSP of sizes 300 and 600μm respectively. Composite design of experiment and analysis of variant (ANOVA) were employed for optimization. Mechanical and morphological analysis of the composite were studied. rLDPE reinforced with AWSP of particle size 300 μm exhibited better tensile strength, modulus of rupture (MOR) and modulus of elasticity (MOE) than those of 600 μm. Morphological analysis showed that uniform distribution of the Walnut shell particulates in the microstructure of the composite is the major factor responsible for the improvement in the mechanical properties. Optimality occurred at a press temperature of 206.465 °C, press time of 10 min, press pressure of 7 MPa yielding a tensile strength of 14.082 MPa, MOR of 17.019 MPa and MOE of 755.028 MPa for 300 μm particle sized composite whereas for 600 μm size, it was achieved at press temperature of 199.993 °C, press time of 6 min, press pressure of 7 MPa giving a tensile strength of 11.252 MPa, MOR of 15.401 MPa and MOE of 459.531 MPa respectively. The result from the optimization met the standard for interior and exterior mirror casing of automobiles.
Use of Antiasthmatic Drugs and the Risk of Type 1 Diabetes in Children: A Nationwide Case-Cohort Study
Authors: Metsälä Johanna , Lundqvist Annamari , Virta Lauri J , Kaila Minna , Gissler Mika , Virtanen Suvi M , Nevalainen Jaakko 
Published: January 2020

Abstract
Asthma has been reported to be associated with an increased risk of type 1 diabetes mellitus in childhood, but the reasons are unclear. We examined whether the use of antiasthmatic drugs was associated with the development of type 1 diabetes in childhood in a nationwide, register-based case-cohort study. We identified all children who were born January 1, 1995, through December 31, 2008, in Finland and diagnosed with type 1 diabetes by 2010 (n = 3,342). A 10% random sample from each birth-year cohort was selected as a reference cohort (n = 80,909). Information on all dispensed antiasthmatic drugs (Anatomical Therapeutic Chemical classification system code R03) during 1995–2009 was obtained, and associations between the use of antiasthmatic drugs and the development of type 1 diabetes were investigated using time-dependent and time-sequential Cox regression models. Dispensed inhaled corticosteroids and inhaled β-agonists were associated with an increased risk of type 1 diabetes after adjusting for other antiasthmatic drugs, asthma, sex, and birth decade (hazard ratio = 1.29, 95% confidence interval: 1.09, 1.52, and hazard ratio = 1.22, 95% confidence interval: 1.07, 1.41, respectively). These findings suggest that children using inhaled corticosteroids or inhaled β-agonists might be at increased risk of type 1 diabetes.
Surgical site infection rate is higher following hip and knee arthroplasty when cefazolin is underdosed
Authors: Morris Arthur J , Roberts Sally A , Grae Nikki , Frampton Chris M 
Published: January 2020

Abstract

Purpose
While many guidelines recommend higher doses of cefazolin for patients with higher body weights, there are scant outcome data showing the benefit of higher doses. Surgical site infection (SSI) rates by dose of cefazolin used for surgical prophylaxis after hip or knee arthroplasty were analyzed.

Methods
Analysis of patient data entered into New Zealand’s national, prospective, surveillance and quality improvement SSI Improvement Programme database for the period July 2013 through December 2017 was conducted. The US Centers for Disease Control and Prevention’s National Healthcare Safety Network SSI definitions were used, and patients were followed for 90 days after surgery. Underdosing was defined as use of 1 g of cefazolin in patients weighing 80 kg or more or a cefazolin dose of &lt;3 g in those weighing 120 kg or more.

Results
There were 38,288 procedures where cefazolin was used for prophylaxis; patient body weight was known for all these procedures. Of the 1,840 patients who received 1 g of cefazolin, 676 (37%) weighed 80 kg or more. Of the 2,011 patients weighing 120 kg or more, 1,464 (73%) were underdosed. After multivariable analysis, male gender, higher total surgical risk scores, performance of revision and hip arthroplasties, and cefazolin underdosing were associated with higher SSI rates. For the 2,106 underdosed patients, the odds ratio for SSI was 2.19 (95% confidence interval, 1.61-2.99; P &lt; 0.0001). The number of higher-weight patients needed to treat to prevent 1 SSI was 83, with an estimated cost of &lt;NZ$500 to prevent 1 infection costing an estimated NZ$40,000.

Conclusion
Patients undergoing hip or knee arthroplasty and with weights of ≥80 kg and those with weights of ≥120 kg should receive cefazolin doses of 2 g and ≥3 g, respectively, for SSI prophylaxis. The question of whether a dose of ≥4 g is needed in patients weighing 120 kg or more or who are above a given body mass index threshold (eg, &gt;35 kg/m2 or &gt;40 kg/m2) remains unanswered.
Categorical perception in animal communication and decision-making
Authors: Green Patrick A , Brandley Nicholas C , Nowicki Stephen 
Published: January 2020

AbstractThe information an animal gathers from its environment, including that associated with signals, often varies continuously. Animals may respond to this continuous variation in a physical stimulus as lying in discrete categories rather than along a continuum, a phenomenon known as categorical perception. Categorical perception was first described in the context of speech and thought to be uniquely associated with human language. Subsequent work has since discovered that categorical perception functions in communication and decision-making across animal taxa, behavioral contexts, and sensory modalities. We begin with an overview of how categorical perception functions in speech perception and, then, describe subsequent work illustrating its role in nonhuman animal communication and decision-making. We synthesize this work to suggest that categorical perception may be favored where there is a benefit to 1) setting consistent behavioral response rules in the face of variation and potential overlap in the physical structure of signals, 2) especially rapid decision-making, or 3) reducing the costs associated with processing and/or comparing signals. We conclude by suggesting other systems in which categorical perception may play a role as a next step toward understanding how this phenomenon may influence our thinking about the function and evolution of animal communication and decision-making.
The antithrombin binding regions of heparin mediate fetal growth and reduced placental damage in the RUPP model of preeclampsia†
Authors: Wat Jovian M , Baczyk Dora , Kingdom John C 
Published: January 2020

AbstractPreeclampsia is a serious hypertensive disorder of pregnancy, which is only cured with delivery of the placenta, thereby commonly necessitating preterm birth of the fetus. Low-molecular-weight heparin (LMWH) has demonstrated potential to reduce the incidence of preeclampsia in high-risk pregnant women, although the underlying mechanism by which LMWH protects against preeclampsia is unknown. Given the complex structure and biologic actions of heparin, we tested the hypothesis that heparin can mediate preeclampsia prevention via nonanticoagulant pathways. We compared the effects of a nonanticoagulant, glycol-split LMWH (gsHep)—rendered nonanticoagulant through disruption of the antithrombin binding regions—with the LMWH dalteparin in the rat reduced uterine perfusion pressure (RUPP) surgical model of preeclampsia. Although RUPP animals exhibit significantly elevated blood pressure and reduced plasma levels of placental growth factor (PGF) compared to sham, neither dalteparin nor gsHep treatment significantly impacted these parameters. However, the observed positive correlation between PGF levels and number of viable fetuses in RUPP-induced animals suggests that reduced PGF levels were predominately due to placental loss. Daily subcutaneous injections of low-dose dalteparin but not gsHep significantly restored fetal growth that was impaired by RUPP surgery. Placentas from RUPP animals exhibited an abnormal labyrinth structure, characterized by expanded sinusoidal blood spaces, relative to sham-operated animals. Morphometric analysis demonstrated that dalteparin but not gsHep treatment normalized development of the labyrinth in RUPP-exposed conceptuses. These data suggest that the antithrombin-binding regions of LMWH are required to confer its protective effects on fetal growth and placental development.
Generalized instrumental inequalities: testing the instrumental variable independence assumption
Authors: Kédagni Désiré , Mourifié Ismael 
Published: January 2020

Summary
This paper proposes a new set of testable implications for the instrumental variable independence assumption for discrete treatment, but unrestricted outcome and instruments: generalized instrumental inequalities. When outcome and treatment are both binary, but instruments are unrestricted, we show that the generalized instrumental inequalities are necessary and sufficient to detect all observable violations of the instrumental variable independence assumption. To test the generalized instrumental inequalities, we propose an approach combining a sample splitting procedure and an inference method for intersection bounds. This idea allows one to easily implement the test using existing Stata packages. We apply our proposed strategy to assess the validity of the instrumental variable independence assumption for various instruments used in the returns to college literature.