Non-reciprocal Heterogeneous Nucleation in Solidification of Ag–Cu Alloys

Qingyuan Qin,Zhao Zhang,Lin Yang,Jinfu Li 대한금속·재료학회 2024 METALS AND MATERIALS International Vol.30 No.5

Taking Ag-27 at% Cu hypoeutectic and Ag-67 at% Cu hypereutectic alloys as examples, a theoretical criterion was establishedbased on the classical nucleation theory to predict the non-reciprocal nucleation. For a eutectic alloy composed of αand β solid phases, non-reciprocal nucleation will not occur if the critical nucleation work of one phase on the other phaseis approximately equal to that of the latter on the former. Otherwise, one phase can act as the more effective nucleationsubstrate for the other phase and non-reciprocal nucleation takes place. For Ag–Cu alloys, the wetting angle of β-Cu onα-Ag is larger than that of α-Ag on β-Cu, but the critical nucleation work for β-Cu to heterogeneously nucleate on α-Ag inhypoeutectic alloys is obviously smaller than that for α-Ag on β-Cu in hypereutectic Ag–Cu alloys. Thus, α-Ag phase is abetter nucleant for β-Cu phase than vice versa and the Ag–Cu alloys solidify with non-reciprocal nucleation, reflected byonly a halo of α-Ag around primary β-Cu phase in the hypereutectic Ag–Cu alloy.

N-doped porous carbon encapsulated MnFe2O4 nanoparticles as advanced anodes for Li-ion batteries

Taolin Zhao,Xinlei Zhang,Zezheng Liu,Qingyuan Gu,Xiaoyu Jin,Saihu Xie,Shuai Liu 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.3

Transition metal oxide MnFe 2 O 4 is considered a promising anode material for Li-ion batteries owing to its high theoreticalspecifi c capacity. However, this material has two bottleneck problems, i.e., poor conductivity and serious volume expansionduring cycling. In this work, MnFe 2 O 4 nanoparticles were successfully encapsulated in the matrix of N-doped porouscarbon via a sol–gel method. As a result, the N-doped carbon matrix enhances the electronic conductivity of the composites. The special porous structure increases the contact area between the electrode material and the electrolyte and facilitates therapid infi ltration of the electrolyte. At a calcination temperature of 400 °C, the MnFe 2 O 4 /C composite shows a high initialdischarge specifi c capacity of 1207.0 mAh g −1 at 0.2 A g −1 and retains a reversible specifi c capacity of 1100.1 mAh g −1after 200 cycles. The simple design of metal oxide nanomaterials encapsulated in N-doped porous carbon provides a newdirection for improving the electrochemical performance of electrode materials for Li-ion batteries.

Quantitative Detection of Corroded Reinforced Concrete of Different Sizes Based on SMFL

Mao Yang,Jianting Zhou,Qingyuan Zhao,Qianwen Xia,Hong Zhang,Lifeng Wang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.1

In order to solve the problem of quantitative detection of corroded reinforced concrete of different sizes, the quantitative detection experiment based on spontaneous magnetic flux leakage (SMFL) was carried out in batches. Electrochemical corrosion of 27 reinforced concrete specimens was carried out, and the SMFL signals of reinforcement were obtained by magnetic detection equipment. Four-dimensional magnetic indicators M1-M4 that can characterize the corrosion degree of the specimens were defined. The influence of different sizes on the magnetic indicators were analyzed. It is concluded that the thicknesses of the concrete covers affect the magnetic indicators by affecting the lift-off heights z. The influence of diameter of the rebars on the quantitative detection can be eliminated by describing the corrosion degree with the average cross-section loss rate α. The influence of length of the rebars on quantitative detection is not clear yet. Finally, Support Vector Machine (SVM) was introduced to establish a classification model of corrosion classes and magnetic indicators. Using the model to predict the corrosion classes of the specimens can achieve a high classification accuracy. The research provides a new method for the quantitative detection of steel corrosion.

Synthesis and Photocatalytic Properties of SnSe2/Se Heterojunction Films

Jing Li,Hongxiao Zhao,Yan Lei,Qingyuan Yang,Zhi Zheng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.4

SnSe2/Se heterojunction films were successfully grown on fluorine-doped tin oxide (FTO) glass for the first time via a one-step solvothermal route using magnetron sputtered Sn metallic precursors, Se powders as selenium source, cyclohexanol as solvent and cyclohexanol as auxiliary solvent, respectively. The SnSe2/Se heterojunction films consisted of Se nanoparticles or nanorods cluster and SnSe2 network surface layers. The crystalline phase and morphology of SnSe2/Se films were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), respectively. The photocatalysis measurements of the products for rhodamine Blue (RhB) demonstrated that SnSe2/Se heterojunction films revealed better dye degradation properties than SnSe2 nanosheet films due to the higher separation rates of photogenerated electron–hole pairs of SnSe2/Se heterojunction films, which can be confirmed by surface transient photovoltage (TPV) analyzer.

The Role of Long Noncoding RNAs in Antiestrogen Resistance in Breast Cancer: An Overview and Update

Lan Huang,Guohua Liang,Qingyuan Zhang,Wenhui Zhao 한국유방암학회 2020 Journal of breast cancer Vol.23 No.2

As a standard treatment, endocrine therapy has dramatically enhanced the prognosis of patients with estrogen receptor (ER)-positive breast cancer, which accounts for nearly 70% of all breast cancers. Antiestrogen drugs such as tamoxifen and aromatase inhibitors are the standard treatment options for ERα-positive breast cancer. However, acquired antiestrogen resistance is still the leading cause of disease recurrence and progression. Evidence has shown that long noncoding RNAs (lncRNAs) play an essential role in the development of antiestrogen resistance in ER-positive breast cancer and can serve as biomarkers or potential therapeutic targets. This review highlights the role of lncRNAs in the development of antiestrogen resistance in breast cancer.

Anatomical Study of the Accessory Tendon of the Extensor Hallucis Longus Muscle and Its Clinical Application

Yue Li,Jing-Ying Zhang,Xin-Yue Zhao,Li-Ya Pan,De-Hao Jin,He-Xing Xu,Hu-Zhe Cui,Yan-Qun Liu,Xiang-Zheng Qin,Qingyuan Li 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.2

Background: The accessory tendon of the extensor hallucis longus (ATEHL) muscle is a common abnormal structure, and its clinical significance remains debatable. In this study, we provide the incidence of the ATEHL and characterize its morphological types in Asian cadavers and investigate its clinical applications. Methods: The tendons from 50 adult cadaveric feet, fixed in 10% formalin, were analyzed. We measured the length and width of both the ATEHL and the extensor hallucis brevis (EHB). Results: All dissected specimens had an ATEHL. The first metatarsophalangeal joint was surrounded by an accessory tendon that inserted onto the joint capsule and the dorsal base of the proximal phalanx. We classified the ATEHL into 3 types based on their directions. Differences in ATEHL type based on sex were not statistically significant. Conclusions: We found an ATEHL in all cadaveric specimens in this study. We surmise that the ATEHL acts as an antagonist with the EHB when the toe is extending, which might help prevent the occurrence of hallux valgus deformity.

Lymphocyte-Activation Gene-3 Expression and Prognostic Value in Neoadjuvant-Treated Triple-Negative Breast Cancer

Yunxuan Wang,Tieying Dong,Qijia Xuan,Hong Zhao,Ling Qin,Qingyuan Zhang 한국유방암학회 2018 Journal of breast cancer Vol.21 No.2

Purpose: In this study, we aimed to evaluate lymphocyte-activation gene-3 (LAG-3) expression and its prognostic value in neoadjuvant- treated triple-negative breast cancer (TNBC). Methods: LAG-3, programmed death-1 (PD-1), programmed death ligand- 1 (PD-L1), and CD8+ tumor-infiltrating lymphocyte (TILs) levels were examined using immunohistochemistry in 148 preand 114 post-neoadjuvant chemotherapy (NACT) specimens of human TNBC tissue. Correlations between expression levels and clinicopathological features were analyzed. Prognostic values for combined detection in TNBC following NACT were evaluated. Results: In pre-NACT specimens, LAG-3 expression showed a significant association with pathological complete response (pCR, p=0.038) and was correlated with PD-1 (p<0.001) and PD-L1 (p=0.008). In post-NACT specimens, high expression of LAG-3 showed significant effects on nodal status (p=0.023) and PD-1 (p<0.001). The expression of immune markers on TILs significantly increased following NACT. Multivariate analysis indicated that only nodal status (odds ratio [OR], 0.226; 95% confidence interval [CI], 0.079–0.644; p=0.005) and high quantities of CD8+TILs (OR, 3.186; 95% CI, 1.314–7.721; p=0.010) are independent predictors of pCR. Nodal status (hazard ratio [HR], 2.666; 95% CI, 1.271–5.594; p=0.010), CD8+TILs (HR, 0.313; 95% CI, 0.139–0.705; p=0.005), and the LAG-3- high/PD-L1-high group (HR, 2.829; 95% CI, 1.050–7.623; p=0.040) provided prognostic values for patients with TNBC following NACT. Conclusion: CD8+TILs were sensitive predictive markers in response to NACT. High expression of LAG-3 in residual tissues, especially in combination with PD-L1, was associated with poor prognosis.

Sulfonated poly (ether ketone sulfone) composite membranes containing ZIF-67 coordinate graphene oxide showing high proton conductivity and improved physicochemical properties

Jingmei Xu,Xuan Chen,Mengchi Ju,Jiahui Ren,Pengyun Zhao,Lingxin Meng,Jinxuan Lei,Qingyuan Shi,Zhe Wang 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.119 No.-

In this study, a sulfonated poly (ether ketone sulfone) with multiple sulfonic acid groups was preparedand named as MSP, where the multiple sulfonic acid groups in the polymer were located on its sidechains of uneven length. And a series of hybrid membranes were prepared by introducing organic–inorganicfillers (ZIF-67/GO) into this side chain type polymer matrix. Among them, ZIF-67 was chemicallygrafted onto the GO sheet through coordination between Co+ and the carboxyl group of GO, bound toGO and grown uniformly. The ZIF-67/GO and hybrid membranes were characterized by FT-IR, XRD,SEM, AFM and 1H NMR. The hybrid membranes exhibited increasingly high proton conductivity fromMSP (0.0876 S cm1) to MSP-1 % ZIF-67/GO (0.1426 S cm1) at 100 C and 100 % relative humidity. Moreover, the hybrid membranes have excellent chemical stability. The results indicated that ZIF-67/GO was important for constructing of proton transport channels, and the prepared hybrid membranesshowed great potential for application in PEM.

Correlation between in vitro fertilization and artificial insemination in Holstein bulls

Sun Wei,Li Yunxia,Su Jie,Bao Xiangnan,Ding Rui,Zhao Gaoping,Cao Guifang,Hu Shuxiang,Wang Jianguo,Sun Qingyuan,Yu Haiquan,Li Xihe 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.12

Objective: Owing to the lack of a breeding index for efficient and quick fertility evaluations of Holstein bulls when using traditional or genome-wide detection methods, this study aimed to determine whether in vitro fertilization (IVF) could be used as an indicator of conception rate of artificial insemination (AI).Methods: Conventional and sexed frozen semen from nine bulls were used for IVF and AI.Results: The IVF and AI conception rates of each bull were confirmed to be positively correlated between the conventional frozen and sexed frozen semen. The correlation coefficient R values of nine bulls between IVF and AI methods were 0.73 and 0.97 for the conventional frozen and sexed frozen semen, respectively. The average conception rate of three bulls undergoing AI was 69.5% and 64.2%, 61.8% and 58.8%, and 48.2% and 46.2% in first-, second-, and third-born cows when conventional frozen and sexed frozen semen were used, respectively, which showed a positive correlation with the fertilization rate in the same parity. We propose an evaluation standard to assess the fertilization ability of bulls based on their IVF test results, which is categorized into three grades: grade one, normal fertility bull with an AI conception rate of 40%±5% and IVF rate of 45% to 60%; grade two, higher fertility bull with an AI conception rate of 50%±5% and IVF rate of 61% to 80%; and grade three, highest fertility bull with an AI conception rate of 60%±5% and IVF rate of >80%.Conclusion: These findings reveal that IVF results can be used as a breeding index for bulls to evaluate their AI conception ability, which may shorten the time required to select bulls for breeding. Objective: Owing to the lack of a breeding index for efficient and quick fertility evaluations of Holstein bulls when using traditional or genome-wide detection methods, this study aimed to determine whether in vitro fertilization (IVF) could be used as an indicator of conception rate of artificial insemination (AI). Methods: Conventional and sexed frozen semen from nine bulls were used for IVF and AI. Results: The IVF and AI conception rates of each bull were confirmed to be positively correlated between the conventional frozen and sexed frozen semen. The correlation coefficient R values of nine bulls between IVF and AI methods were 0.73 and 0.97 for the conventional frozen and sexed frozen semen, respectively. The average conception rate of three bulls undergoing AI was 69.5% and 64.2%, 61.8% and 58.8%, and 48.2% and 46.2% in first-, second-, and third-born cows when conventional frozen and sexed frozen semen were used, respectively, which showed a positive correlation with the fertilization rate in the same parity. We propose an evaluation standard to assess the fertilization ability of bulls based on their IVF test results, which is categorized into three grades: grade one, normal fertility bull with an AI conception rate of 40%±5% and IVF rate of 45% to 60%; grade two, higher fertility bull with an AI conception rate of 50%±5% and IVF rate of 61% to 80%; and grade three, highest fertility bull with an AI conception rate of 60%±5% and IVF rate of >80%. Conclusion: These findings reveal that IVF results can be used as a breeding index for bulls to evaluate their AI conception ability, which may shorten the time required to select bulls for breeding.

Research on the Detection of the Broken Wire Damage of a Cable in the Circumferential Directions Based on Self-magnetic Flux Leakage

Yinghao Qu,Jianting Zhou,Renming Liu,Leng Liao,Qingyuan Zhao 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.3

For large section members such as cables, there are insufficient methods for circumferential scanning along the cable sections for the detection of corroded broken wires. In this study, a detection method for broken wire damage (BWD) along the circumferential direction of cable based on the principle of self-magnetic flux leakage (SMFL) was proposed. First, the theoretical calculation model and the finite element model of the circumferential magnetic field in the polar coordinate system were established. The analysis results showed that the position of the BWD on the section of cable could be effectively judged by the concave position of the curves of the SMFL in the polar coordinate system. Through the circumferential scanning at different positions, the length of the BWD could be judged by the coordinates of x when the value of index “C” (similarity to circle) approached 1 for the first time in the x - C curves. Finally, the detection experiment for the BWD of a parallel wire bundle was carried out. The experimental results were consistent with the analysis results for the theoretical model and the finite element, and the experimental results verified the correctness of the detection method.