Search results for: Jinyu Xu

Items from 1 to 20 out of 34 results

article

Resonance Interaction Energy in κ‐Minkowski Spacetime

Jinyu Xu, Jiawei Hu, Hongwei Yu

Annalen der Physik > 535 > 7 > n/a - n/a

If gravity is quantized, one of the consequences may be that the spacetime coordinates are quantized and become noncommutative. The κ‐Minkowski spacetime is such kind of noncommutative spacetime. In this paper, the resonance interaction energy of a two‐atom system coupled with a fluctuating vacuum scalar field in the κ‐Minkowski spacetime is studied. It is found that the resonance interaction energy...

article

Change in weight category among youth early in the COVID‐19 pandemic

Ihuoma Eneli, Jinyu Xu, Keeley Pratt

Clinical Obesity > 12 > 3 > n/a - n/a

Remote learning and shelter‐in‐place orders during the COVID‐19 pandemic are associated with obesity risk factors such as decreased physical activity, altered routines and sleep schedules, increased screen time, and non‐nutritious food choices. The objective of this brief report is to describe change in weight category 3–6 months after the onset of the pandemic in a cohort of 4509 low‐income youth...

article

Expression of mitofusin 2 in placentae of women with gestational diabetes mellitus

Bingjin Chen, Yajuan Ge, Honglin Wang, Haihong Zhu, more

Journal of Genetics > 2018 > 97 > 5 > 1289-1294

Gestational diabetes mellitus (GDM) represents a common carbohydrate metabolism disorder during pregnancy. The objective of this study was to evaluate the expression levels of mitofusin 2 (MFN2) expression in placentae of GDM patients compared to that in the placental tissues from normal uncomplicated pregnancies. A total of 70 subjects were enrolled from September 2014 to June 2016, including 42...

article

Compressive failure characteristics of yellow sandstone subjected to the coupling effects of chemical corrosion and repeated freezing and thawing

Xinyu Fang, Jinyu Xu, Peixi Wang

Engineering Geology > 2018 > 233 > C > 160-171

The coupling effects of chemical corrosion and freeze-thaw (F-T) cycling on the compressive failure characteristics of yellow sandstone were investigated. Results show that both chemical corrosion and minimum temperature in F-T cycles have adverse effect on the mechanical properties of yellow sandstone. With decreasing minimum F-T temperature and pH of the corrosive solution, peak stress and elastic...

article

Ultrasonic time-frequency method to evaluate the deterioration properties of rock suffered from freeze-thaw weathering

Peng Wang, Jinyu Xu, Xinyu Fang, Peixi Wang, more

Cold Regions Science and Technology > 2017 > 143 > C > 13-22

Cyclic freeze-thaw (F-T) is a serious natural weathering mechanism for rock engineering and stone constrictions in cold regions. Considering the universality and destructiveness of rock F-T weathering, evaluation of rock deterioration is of vital importance. In this work, ultrasonic detections and mechanical experiments including uniaxial compression, splitting tension and angle-changed shear tests...

article

Characteristics of weight regain following sleeve gastrectomy in an adolescent bariatric program

Astrid Rocio Soares Medina, Marnie Walston, Jinyu Xu, Ihuoma Eneli, more

Surgery for Obesity and Related Diseases > 2017 > 13 > 10(S) > S70

article

Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

Peng Wang, Jinyu Xu, Xinyu Fang, Ming Wen, more

Engineering Geology > 2017 > 223 > C > 1-10

Thermal shock (TS) is common for rock engineering where the environment temperature changes sharply. As a typical kind of brittle material, rock fails mainly because that the tensile stress exceeds the tensile strength, which is influenced significantly by strain rate. In this work, physical detection, quasi-static and dynamic splitting tensile tests were carried out on red-sandstone free from and...

article

Energy dissipation and damage evolution analyses for the dynamic compression failure process of red-sandstone after freeze-thaw cycles

Peng Wang, Jinyu Xu, Xinyu Fang, Peixi Wang

Engineering Geology > 2017 > 221 > C > 104-113

Based on the Split Hopkinson Pressure Bar (SHPB) system, dynamic compressive tests were done on red-sandstone specimens, which were free from freeze-thaw (F-T) or suffered from 5, 10, 15, 25 F-T cycles. Stress–strain curves and energy evolution curves of specimens were analyzed as well as the dynamic mechanical properties and energy indexes. The results indicated that red-sandstone suffered a lot...

article

A prediction model for the dynamic mechanical degradation of sedimentary rock after a long-term freeze-thaw weathering: Considering the strain-rate effect

Peng Wang, Jinyu Xu, Shi Liu, Shaohe Liu, more

Cold Regions Science and Technology > 2016 > 131 > C > 16-23

Rock engineering and stone construction in cold region are always suffering the recurrent freeze-thaw (F-T), and rock mechanical behaviors in projects usually involve responses to stress pulses or impact loads due to the widely existed blasting operation, mechanized construction and seismic oscillation. In this work, physical tests as well as static and impact mechanical experiments were carried out...

article

Dynamic mechanical properties and deterioration of red-sandstone subjected to repeated thermal shocks

Peng Wang, Jinyu Xu, Shaohe Liu, Haoyu Wang

Engineering Geology > 2016 > 212 > C > 44-52

Rock engineering and stone constructions are always suffering recurrent thermal shock (TS) generated by sudden changes in temperature, and rock mechanical behaviors in projects usually involve responses to stress pulses or impact loads due to the widely existed blasting operation, mechanized construction and seismic oscillation. In this work, physical tests as well as static and dynamic mechanical...

article

Static and dynamic mechanical properties of sedimentary rock after freeze-thaw or thermal shock weathering

Peng Wang, Jinyu Xu, Shi Liu, Haoyu Wang, more

Engineering Geology > 2016 > 210 > C > 148-157

Rocks in engineering works and as building materials are always suffering freeze-thaw (F-T) and thermal shock (TS) weathering, and engineering rocks usually involve responses to impact loads from blasting operation, mechanized construction and seismic oscillation. Sedimentary rock distributes extensively and is important for engineering geological and hydrogeological works. For a deeper understanding...

article

Experiment research on mix design and early mechanical performance of alkali-activated slag using response surface methodology (RSM)

Yuan Gao, Jinyu Xu, Xin Luo, Jingsai Zhu, more

Ceramics International > 2016 > 42 > 10 > 11666- 11673

To enhance the quality of alkali-activated slag (AAS) materials, scientific and efficient mix design method is preferred. This paper presents an optimization of AAS materials using Response Surface Methodology (RSM). Three factors related to early strength such as modulus (n), concentration of alkali activator (CAA) and liquid–solid ratio (LSR) were investigated. Specimens with different mix ratios...

chapter

An XML-Based Interface Customization Model in Digital Museum

Rui Wang, Chengwei Yang, Jinyu Xu, Chenglei Yang, more

Lecture Notes in Computer Science > Transactions on Edutainment III > Regular Papers > 190-202

In this paper we present a XML-based interface customization model used in the construction of digital museum. Traditional component developing methods pay more attention to the function implementation. Meanwhile the interface and function realization are generally written together. In contrast the system interface is hard to implement and bald. Indeed, users usually want to customize Web interface...

article

Mechanical properties of geopolymer concrete exposed to dynamic compression under elevated temperatures

Haoyang Su, Jinyu Xu, Weibo Ren

Ceramics International > 2016 > 42 > 3 > 3888-3898

Through adoption of a self-designed high temperature SHPB apparatus herein, an experimental study is made on the mechanical properties of geopolymer concrete (GC) exposed to dynamic compression under elevated temperatures. As the results have turned out, the weight loss is remarkable within temperature ranges from room temperature to 200°C as well as from 600°C to 800°C. The dynamic compressive strength...

article

A Modified Overstress Model to Simulate Dynamic Split Tensile Tests and Its Experimental Validation

Xinyu Fang, Jinyu Xu

Rock Mechanics and Rock Engineering > 2016 > 49 > 9 > 3823-3828

article

Dynamic compressive behaviour of concrete after exposure to elevated temperatures

Weibo Ren, Jinyu Xu, Haoyang Su

Materials and Structures > 2016 > 49 > 8 > 3321-3334

The aim of this paper is to investigate the high temperature performance of concrete under impact loading. A split Hopkinson pressure bar system was employed to determine the dynamic mechanical properties of concrete under different strain rates and temperatures. The results indicate that the hardening and toughening effects of strain rate on concrete are obvious under a given temperature. Moreover,...

article

Static and dynamic mechanical properties of high early strength alkali activated slag concrete

Yuan Gao, Jinyu Xu, Erlei Bai, Xin Luo, more

Ceramics International > 2015 > 41 > 10 Part A > 12901- 12909

In this study, high early strength alkali activated slag concrete (AASC) was prepared successfully. The compressive and flexural strength with 3h of water curing reached 39.2MPa and 3.26MPa, respectively. A 100mm diameter split Hopkinson pressure bar (SHPB) system improved by the pulse shaper technique was used to conduct the impact compression test on AASC. The stress–strain curves under different...

article

Dynamic mechanical properties of geopolymer concrete after water immersion

Weibo Ren, Jinyu Xu, Junliang Liu, Haoyang Su

Ceramics International > 2015 > 41 > 9 Part B > 11852- 11860

This paper aims to investigate the influence of water immersion on dynamic mechanical properties of geopolymer concrete (GC). Dynamic compressive tests on specimens placed indoors (GC_N) and specimens with water immersion (GC_W) were conducted by a split Hopkinson pressure bar system. The results indicate that the dynamic strength and impact toughness of GC_N and GC_W display an increasing trend as strain...

article

A new method to investigate the energy absorption characteristics of thin-walled metal circular tube using finite element analysis

Xin Luo, Jinyu Xu, Jingsai Zhu, Yuan Gao, more

Thin-Walled Structures > 2015 > 95 > Complete > 24-30

A numerical study is made to investigate the energy absorbing rule of thin-walled metal circular tube made of three different materials (steel, copper, aluminum) by using response surface methodology (RSM). At the same time, the application prospect of RSM in terms of the research on the energy absorption rule of energy absorption structure can be explored. The test result shows that, the compression...

article

Effect of strain rate on the dynamic compressive mechanical behaviors of rock material subjected to high temperatures

Shi Liu, Jinyu Xu

Mechanics of Materials > 2015 > 82 > Complete > 28-38

Strain rate is not only an important measure to characterize the deformation property, but also an important parameter to analyze the dynamic mechanical properties of rock materials. In this paper, by using the SHPB test system improved with high temperature device, the dynamic compressive tests of sandstone at seven temperatures in the range of room temperature to 1000°C and five impact velocities...

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INFONA - science communication portal

Search results for: Jinyu Xu

Resonance Interaction Energy in κ‐Minkowski Spacetime

Change in weight category among youth early in the COVID‐19 pandemic

Expression of mitofusin 2 in placentae of women with gestational diabetes mellitus

Compressive failure characteristics of yellow sandstone subjected to the coupling effects of chemical corrosion and repeated freezing and thawing

Ultrasonic time-frequency method to evaluate the deterioration properties of rock suffered from freeze-thaw weathering

Characteristics of weight regain following sleeve gastrectomy in an adolescent bariatric program

Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

Energy dissipation and damage evolution analyses for the dynamic compression failure process of red-sandstone after freeze-thaw cycles

A prediction model for the dynamic mechanical degradation of sedimentary rock after a long-term freeze-thaw weathering: Considering the strain-rate effect

Dynamic mechanical properties and deterioration of red-sandstone subjected to repeated thermal shocks

Static and dynamic mechanical properties of sedimentary rock after freeze-thaw or thermal shock weathering

Experiment research on mix design and early mechanical performance of alkali-activated slag using response surface methodology (RSM)

An XML-Based Interface Customization Model in Digital Museum

Mechanical properties of geopolymer concrete exposed to dynamic compression under elevated temperatures

A Modified Overstress Model to Simulate Dynamic Split Tensile Tests and Its Experimental Validation

Dynamic compressive behaviour of concrete after exposure to elevated temperatures

Static and dynamic mechanical properties of high early strength alkali activated slag concrete

Dynamic mechanical properties of geopolymer concrete after water immersion

A new method to investigate the energy absorption characteristics of thin-walled metal circular tube using finite element analysis

Effect of strain rate on the dynamic compressive mechanical behaviors of rock material subjected to high temperatures

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