Hot Compression Mechanism and Comparative Study on Constitutive Models of Mo–3 vol%Al2O3 Alloys

Liying Yao,Yimin Gao,Liujie Xu 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

The hot compression tests for Mo–3 vol.%Al2O3 alloys were conducted on a Gleeble-1500D thermo-mechanical simulatorin the temperatures range of 1000–1300 °C and strain rates range of 0.005–1 s−1. The hot deformation behavior, mechanismassociated with microstructure evolution of Mo–3 vol.%Al2O3 alloys was investigated by electron backscattering diffractionanalysis. Three types of stress–strain curves were analyzed by quantifying the work hardening rate. The deformation mechanismat 1000–1300 °C mainly included the plastic deformation of Mo–3 vol.%Al2O3 alloy, as well as the dynamic recoveryand recrystallization of Mo matrix. The modified Arrhenius, Modified Johnson–Cook and modified Zerilli–Armstrongconstitutive equations were established and evaluated by the correlation coefficient (Rc) and average absolute relative error( ̄e). The flow stress of Mo–3 vol.%Al2O3 alloys could be well predicted by those three constitutive models, but modifiedArrhenius constitutive model had a higher predicated accuracy.

Fabrication of hydrophobic and oleophilic polyurethane foam sponge modified with hydrophobic Al2O3 for oil/water separation

Liying Kong,Yang Li,Fengxian Qiu,Tao Zhang,Qing Guo,Xiaoying Zhang,Dongya Yang,Jicheng Xu,Mengwei Xue 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-

In current work, hydrophobic and oleophilic polyurethane (Al2O3/PUF) foam sponge was prepared by foaming technology. The material was characterized by XRD, TEM, BET, SEM and water contact angles (CA). The Al2O3/PUF was applied to removal of oil or organic solvent from oil/water system. Water contact angle of Al2O3/PUF could exceed 140°. The absorption capacity of Al2O3/PUF could be obtained 37 g/g and found to be reusable up to 10 cycles while maintaining its high absorption capacity. The result indicated that prepared foam sponge has good potential application in oil–water separation.

Based on the Improved Fusion Algorithm of Wavelet Image Contrast and Canny Operator

Liying Yuan,Xue Xu 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.8

Aiming at the visual effect and the fusion quality is poor of the traditional image fusion algorithm, the new fusion algorithm is adopted that combining the Canny operator with taking big window contrast. The algorithm uses wavelet transform to the original images are decomposed firstly, the process will be based on the frequency characteristics of the image information to form two pieces of information, low frequency and high frequency information. Low frequency subband uses weighted average fusion algorithm, while high frequency subband uses the algorithm which combines Canny operator with taking big window contrast, the last fusion image is got from the wavelet reconstruction in contrast to the principle of wavelet decomposition . The corresponding simulation analysis was carried out on the fusion algorithm, and the visual effect is more clear. Also the object evaluation standard increased significantly.

Fabrication of hydrophobic ZIFs based composite membrane with high CO2 absorption performance

Li Xu,Yu Qin,Liying Liu,Juntian Xiao,Zhongwei Ding 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5

The membrane contactor has been considered an effective device to capture CO2, but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8o. And after a ten-day immersion test in CO2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO2 permeability of the composite membrane was 61.8×10-8·mol·m-2·s-1·Pa-1 with an ideal CO2/N2 separation factor of ~20, which was effectively improved in comparison with the control membrane. In the CO2 absorption experiment, the prepared membrane achieved the competitive CO2 flux of 3.02×10-3·mol·m-2·s-1 when the liquid velocity was 0.25m·s-1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.

Preparation of self‑supporting Co3S4/ S‑rGO film catalyst for efficient oxygen evolution reaction

Liang Chen,Liying Hu,Chenxi Xu,Lanyun Yang,Wei Wang,Junlin Huang,Minjie Zhou,Zhaohui Hou 한국탄소학회 2023 Carbon Letters Vol.33 No.7

Exploring cheap and efficient oxygen evolution reaction (OER) catalysts is extremely vital for the commercial application of advanced energy storage and conversion systems. Herein, a self-supporting Co3S4/ S-doped reduced graphene oxide ( Co3S4/S-rGO) film catalyst is successfully prepared by a blade coating coupled with high-temperature annealing strategy, and its morphology, structure and composition are measured and analyzed. It is substantiated that the as-synthesized Co3S4/ S-rGO film possesses unique self-supporting structure, and is composed of uniformly dispersed Co3S4 nanoparticles and highly conductive S-rGO, which benefit the exposure of catalytic sites and electron transfer. By reason of the synergistic effect of the two individual components, the self-supporting Co3S4/ S-rGO film catalyst displays outstanding catalytic performance towards OER. As a consequence, the Co3S4/ S-rGO film catalyst delivers an overpotential of 341 mV at 10 mA cm-2, and the current attenuation rate is only 2.6% after continuous operation for 4 h, verifying excellent catalytic activity and durability. Clearly, our results offers a good example for the construction of high-performance self-supporting carbon-based composite film catalysts for critical electrocatalytic reactions.

Exploring the self‐care practices of social workers in China under the COVID ‐19 pandemic

Li Qing,Xu Liying,Wang Yun,Zhu Yun,Huang Yan 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.3

The self-care practices of social workers have garnered increasing attention in the literature, yet little is known about the case of China. To explore the self-care practices of Chinese social workers under the COVID-19 pandemic, this study uses the Self-Care Practice Scale (SCPS) to measure the self-care practices of social workers (N = 1066) in Fujian Province, China. The results indicate that Chinese social workers engage in moderate amounts of self-care practices under the COVID-19 pandemic. Significant group differences exist in social workers' self-care practices by marital status, parenting status, age, health satisfaction, years of practicing social work, average hours of work per day, resignation intention, job satisfaction, number of received supervision services in a year, and self-care education. Significant predictors of self-care include marital status, monthly salary, service status, average hours of work per day, number of received supervision services in a year, school self-care education, job satisfaction, and health satisfaction. This study has practical implications for self-care education and practice, including workplace health promotion and the development of self-care practice policies.

Observation and Mechanism of Photo-isomerisation Induced Rapid Photo-degradation of Optical Nonlinearity in Guest-host Type Poled Polymer

Mingxin Ye,Lei Xu,Jieyun Yan,Liying Liu,Liyong Ji,Wencheng Wang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.32

Photo-degradation of electric eld poled alpha0-cyano-40-nitro-4-N,N-dimethylaminostilbene (CNDS) doped polymer was investigated by second-harmonic generation (SHG), UV-Vis absorption and FTIR. We found that the addition of a cyano group makes CNDS much more easily photoisomerized, and thus destroys the molecular ordering in poled chromophore doped polymers. A comparison experiment revealed that the photo-isomerization of CNDS is even easier than that of a modal system of azobenzene, which shows that CNDS has potential applications, such as in optical switches.

Er3+/Yb3+ Co-Doped Waveguide Amplifier and Lossless Power Splitter Fabricated by a Two-Step Ion Exchange on a Commercial Phosphate Glass

Zian He,Lei Xu,Dongxiao Li,Liying Liu,Yanwu Zhang,Yigang Li 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I

An Er3+/Yb3+ co-doped waveguide amplifier and a lossless power splitter were fabricated by two-step ion exchange on commercial Schott IOG-1 glasses. A two-dimensional ion exchange model was set up, and numerical simulations using a finite-element-method agreed well with experimental results. A total net gain of 6 dB was achieved in a 2.5-cm-long waveguide amplifier, and a lossless power splitter was successfully realized as well.kci

Large Second-Order Nonlinearity from a Dip-Coated Pure Dye (4-(2-(3,3-Dicyanomethylene-5,5-Dimethyl-1-Cyclohexylidene) Vinyl)Phenyl(1-Naphthyl)Phenylamine) Thin Film

Pei Yang,Huiying Fu,Liying Liu,Liyong Ji,Lei Xu,Fei Xiao 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I

We found that the pure dye 4-(2-(3,3-dicyanomethylene-5,5-dimethyl-1-cyclohexylidene)vinyl) phenyl(1-naphthyl)phenylamine can form a solid-state thin film up to 31 nm in thickness by simple dip-coating. After electric poling, the molecular film was very well oriented along the poling field’s direction (ordering parameter = 0.36). The poled film gave a large resonant second-harmonic generation (SHG) signal ((2) = 591 pm/V when using 1064-nm laser light as the fundamental light) and non-resonant SHG ((2) = 232 pm/V when using 800-nm laser light as the fundamental light). The results show that such molecules can find applications in nonlinear photonic integrated circuits.

Diagnosis and Treatment of Contemporary Chinese College Students’ ‘Empty Heart Disease’: Based on the Theory and Practice of Philosophical Counseling and Therapy

Xiao-Jun Ding,Feng Yu,Liying Xu 강원대학교 인문과학연구소 2019 Journal of Humanities Therapy Vol.10 No.1

In their daily lives, with varying degrees, many Chinese college students are stuck in the predicaments of lacking life meanings and values. They have a strong sense of loneliness and meaninglessness, not knowing what they are living for. If such ethical predicaments are not solved efficiently and timely, then they 1may result in very serious psychological, mental or even physical problems. In fact, the so-called ‘empty heart disease’ (空心病) is not a kind of psychological or mental disease, but rather a ‘perplexity’ in mind which is very commonly seen during the growth of the youth. Based on the philosophical theories and methods, the trained philosophical workers can provide suggestions and guidances towards people’s concrete problems and situations, so that people can obtain larger space and also better capacity of thinking; by doing so, the perplexities that trouble the people will thus be hopefully solved, achieving the purpose of ‘disambiguation’. In the philosophical counselors’ opinions, it is the human beings themselves that give meanings to their lives. Therefore, to solve the ‘empty heart disease’ problem, we can not depend on just preaching or inculcating externally; rather, we should encourage and inspire the college students to reflect on the purposes of their lives and their self-identities, so that they can afterwards recreate and develop their values and senses of meanings. Finally, the differences of ‘empty heart disease’, ‘noogenic neurosis’ and ‘existential neurosis’ are discussed in this paper, while an analysis of the boundaries between the need for psychotherapy and the need for philosophical counseling in relation to the three ‘diseases’ is also made.