EELS and electron diffraction studies on possible bonaccordite crystals in pressurized water reactor fuel CRUD and in oxide films of alloy 600 material

Jiaxin Chen,Fredrik Lindberg,Daniel Wells,Bernt Bengtsson 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.4

Experimental verification of boron species in fuel CRUD (Chalk River Unidentified Deposit) would provideessential and important information about the root cause of CRUD-induced power shifts (CIPS). Todate, only bonaccordite and elemental boron were reported to exist in fuel CRUD in CIPS-troubledpressurized water reactor (PWR) cores and lithium tetraborate to exist in simulated PWR fuel CRUDfrom some autoclave tests. We have reevaluated previous analysis of similar threadlike crystals alongwith examining some similar threadlike crystals from CRUD samples collected from a PWR cycle that hadno indications of CIPS. These threadlike crystals have a typical [Ni]/[Fe] atomic ratio of ~2 and similarcrystal morphology as the one (bonaccordite) reported previously. In addition to electron diffractionstudy, we have applied electron energy loss spectroscopy to determine boron content in such a crystaland found a good agreement with that of bonaccordite. Surprisingly, such crystals seem to appear also oncorroded surfaces of Alloy 600 that was exposed to simulated PWR primary water with a dissolvedhydrogen level of 5 mL H2/kg H2O, but absent when exposed under 75 mL H2/kg H2O condition. It remainsto be verified as to what extent and in which chemical environment this phase would be formed inPWR primary systems.

Fast Response Research of Magnetically Controlled Reactor

Chen Feng,Wang Jun,Zheng Hao,Lu Wenhua,Tian Cuihua,Yuan Jian,Chen Baichao,Yuan jiaxin 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.10

As a kind of reactive power compensation equipment with control flexibility and high reliability, magnetically controlled reactor (MCR) is widely used in reactive power compensation, over-voltage limitation and other aspects. However, low responding speed has severely limited the application of MCR. Especially when applied to suppress voltage flicker and arc suppression coil, the slow response of MCR will decrease the stability of control system, even causing the system shock. To improve the response performance of MCR, in this paper, the working principle of MCR has been analyzed, and a fast response structure of MCR has been designed with the novel fast response structure, fast excitation and rapid demagnetization can be achieved. According to the simulation and experiment results, the effectiveness of the proposed structure is verified by limiting the response time in 30ms.

Protective effect of Macleaya cordata isoquinoline alkaloids on lipopolysaccharide-induced liver injury in broilers

Jiaxin Chen,Weiren Yang,Hua Liu,Jiaxing Niu,Yang Liu,Qun Cheng Asian Australasian Association of Animal Productio 2024 Animal Bioscience Vol.37 No.1

Objective: This experiment aimed to explore the protective action of dietary supplementation with isoquinoline alkaloids (IA) from Macleaya cordata on lipopolysaccharide (LPS)-induced liver injury in broilers. Methods: Total 216 healthy broilers were selected in a 21-d trial and assigned randomly to the following 3 treatments: control (CON) group, LPS group, and LPS+IA group. The CON and LPS groups were provided with a basal diet, whereas the LPS+IA group received the basal diet supplemented with 0.6 mg/kg Macleaya cordata IA. Broilers in LPS and LPS+IA groups were intraperitoneally injected with LPS (1 mg/kg body weight) at 17, 19, and 21 days of age, while those in CON group were injected with equivalent amount of saline solution. Results: Results showed LPS injection caused systemic and liver inflammation in broilers, inhibited immune function, and ultimately lead to liver injury. By contrast, supplementation of IA ameliorated LPS-induced adverse change in serum parameters, boosted immunity in LPS+IA group. Furthermore, IA suppressed the elevation of hepatic inflammatory cytokines and caspases levels induced by LPS, as well as the expressions of genes related to the toll-like receptor 4 (TLR4)/myeloid differentiation primary response 88 (MyD88)/nuclear factor-kappa B (NF-κB) pathway. Conclusion: Dietary inclusion of 0.6 mg/kg Macleaya cordata IA could enhance immune function of body and inhibit liver damage via inactivating TLR4/MyD88/NF-κB signaling pathway in broilers.

High-Capacity Robust Image Steganography via Adversarial Network

( Beijing Chen ),( Jiaxin Wang ),( Yingyue Chen ),( Zilong Jin ),( Hiuk Jae Shim ),( Yun-qing Shi ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

Steganography has been successfully employed in various applications, e.g., copyright control of materials, smart identity cards, video error correction during transmission, etc. Deep learning-based steganography models can hide information adaptively through network learning, and they draw much more attention. However, the capacity, security, and robustness of the existing deep learning-based steganography models are still not fully satisfactory. In this paper, three models for different cases, i.e., a basic model, a secure model, a secure and robust model, have been proposed for different cases. In the basic model, the functions of high-capacity secret information hiding and extraction have been realized through an encoding network and a decoding network respectively. The high-capacity steganography is implemented by hiding a secret image into a carrier image having the same resolution with the help of concat operations, InceptionBlock and convolutional layers. Moreover, the secret image is hidden into the channel B of carrier image only to resolve the problem of color distortion. In the secure model, to enhance the security of the basic model, a steganalysis network has been added into the basic model to form an adversarial network. In the secure and robust model, an attack network has been inserted into the secure model to improve its robustness further. The experimental results have demonstrated that the proposed secure model and the secure and robust model have an overall better performance than some existing high-capacity deep learning-based steganography models. The secure model performs best in invisibility and security. The secure and robust model is the most robust against some attacks.

중국 한푸(汉服) 요소를 스캠퍼(SCAMPER) 기법에 적용한 힙합 패션디자인개발

진가인 ( Jiaxin Chen ),서승희 ( Seunghee Suh ) 한국패션비즈니스학회 2021 패션 비즈니스 Vol.25 No.1

The objective of this study is to develop and present the modern men’s hip-hop fashion designs using the design elements of Hanfu which is a traditional culture of China as a motif by applying the SCAMPER technique. In the research methods, this study conducted the literature review and work production. In the process of work development, first, after setting up the concept, a design map was produced. Second, the characteristics of hip-hop fashion style and the design elements of Hanfu were organized. Third, this study developed the hip-hop fashion designs reinterpreting the design elements of Hanfu into modern hip-hop styles by applying the SCAMPER conception list. Fourth, Fourth, of the developed designs, the finally decided upon designs were produced into real six articles, which included a T-shirt, shirt, zippered sweater, jumper, denim jacket, long jumper, denim pants, baggy pants, and short pants. This study offers the possibility of developing Chinese hip-hop fashion design targeting the emerging Chinese hip-hop fashion market by suggesting hip-hop fashion designs with the characteristics of Chinese traditional culture.

The Pareto Optimal Control of Inverter based on Multi-objective Immune Algorithm

Jiaxin Yuan,Gang Xue,Zhen Zhao,Baichao Chen 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6

In this paper, an immune-algorithm-based PARETO optimal control strategy is proposed for multi-objective optimization of the output waveform quality and switching loss of a single-phase inverter. A picture of the relationship between the waveform quality and switching losses in the form of the Pareto frontier is plotted, forming an optimal Pareto optimal solution set in different inductive load. The calculation of the switching loss relies on the following factors: data sheet providing the characteristic parameters of the devices, load current (collector current), the switching gate signal and the DC bus voltage. Finally, the experimental platform based on DSP+FPGA as the core control system is established and adequate experiments are carried out, using the Holzer current sensor to collect the inverter output current signal and the thermistor PT100 to indirectly measure the switching loss of the inverter. Simulation and experimental data show that the method is feasible and effective.

Synthesis of 1, 4, 7-triazaheptane derivative and its corrosion inhibition for mild steel in the hydrochloric medium

Jiaxin Wena,Xin Zhang,Jinlong Chen,Ting Liu,Yi Zhou,Lingjie Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.107 No.-

To exploit the advanced corrosion inhibitor for mild steel in acidic solution, N, N, N, N, N′-pentakis (2-hydroxyethyl)-1,4,7-triazaheptane (PHET) was synthesized by a facile process, which was confirmed by FT-IR, NMR and EI-MS. Inhibition effect of PHET was examined on mild steel in 1.0 M HCl solution by using weight loss, electrochemical tests and surface analyses. The results showed that the optimal concentration of PHET in HCl solution was 400 mg/L corresponding to the inhibitive efficiency of 93% at 293 K. PHET presented superior and durable corrosion inhibition performance for mild steel. Meanwhile, PHET acted as a mixed-type inhibitor which affects both anodic and cathodic reactions of the corrosion process. PHET could be absorbed on mild steel through forming complexes with ferrous ions that acted as protective film, which was supported by UV–vis and XPS analyses. The adsorption process of PHET molecules on mild steel, following Langmuir adsorption isotherm, was an exothermal process and belonged to mixed adsorption mechanisms ( =-31.78 kJ mol−1, 293 K) between physisorption and chemisorption. Besides, theoretical calculations were conducted to give further investigation on the inhibition mechanism of PHET and elucidated the adsorption behaviour of PHET. PHET synthesized in this work also can be extended to use for the corrosion protection of other metals in acidic medium.

유아중심 STEAM 놀이 프로그램 개발에 참여한 전문적 학습공동체의 대화 및 의사결정

곽영숙,Chen Jiaxin,정진성 동명대학교 창의·인성연구소 2022 교육과 문화 Vol.4 No.2

본 연구에서는 유아를 위한 STEAM 교육에서 유아의 놀이가 강조되고 존중되는 프로그램을 개발하고자 전문학습공동체를 구성하였다. 유아중심 STEAM 놀이 프로그램 개발에서 가장 중점을 두었던 부분은‘유아의 발현된 놀이’와‘교육적 의도를 가진 STEAM교육’의 조화 및 균형을 실천할 수 있는 내용을 개발하는 일이었다. 대화 및 의사결정에 참여한 연구자는 유아교육을 전공한 박사 수료생 2인 및 해외 교원 자격증을 소지한 미술작가 1인이다. 본 연구는 2022년 4월부터 2022년 9월까지 프로그램 개발과정에서 논의된 사안들을 중심으로 기술하고자 한다. 수집된 자료를 분석한 결과를 바탕으로 연구결과를 다섯 가지로 제시하였다: 이러한 결과를 바탕으로 유아 중심의 STEAM 교육 및 STEAM 교육에서 놀이를 강조할 수 있는 프로그램 개발에 관한 시사점을 두 가지 측면에서 그 의의를 논의하였다. 첫째, 본 고의 발현적 교육의 정의 문구‘나타나거나, 나타나게 하거나, 나타난 결과’를 기준으로써 비교 및 논의하였다. 둘째, 전문적 학습공동체의 다른 관점 조율의 의미, 대화 상대자와 공유 지점 구성, 공유된 비전 및 공동의 실천방안 모색의 차원에서 논의하였다.

Analysis of treatment modalities and prognosis on microinvasive cervical cancer: a 10-year cohort study in China

Qiuhong Qian,Jiaxin Yang,Dongyan Cao,Yan You,Jie Chen,Keng Shen 대한부인종양학회 2014 Journal of Gynecologic Oncology Vol.25 No.4

Objective: To explore appropriate treatment modality of microinvasive cervical cancer (MIC) and to analyze prognosis and risk factors of recurrence. Methods: A cohort of 324 Chinese patients with MIC diagnosed and treated at Peking Union Medical College Hospital was retrospectively reviewed. Demographic features, treatment modalities, pathologic parameters, risk factors of residual disease, survival and risk factors of recurrence were analyzed. Results: Of all patients, 280 cases were staged IA1 and 44 cases staged IA2 MIC. Twenty-five cases (7.7%) were found to have lympho-vascular space involvement (LVSI), but no parametrial involvement or ovarian metastasis was detected. Only one staged IA2 patient with LVSI was found to have lymph node metastasis. 32.4% patients (82/253) had residual diseases after conization. No significant difference of LVSI, lymph node metastasis and residual disease after coniztion was found between stage IA1 and IA2 MIC patients. Multivariate logistic analysis showed positive margin was the only independent risk factor of residual disease after conization (odds ratio [OR], 4.18; p<0.001). Recurrence occurred in five cases, but no mortality was found. Progression-free survival for stage IA1 patients treated by conization or hysterectomy was similar (92.3% and 98.8%, p=0.07). Cox regression analysis revealed LVSI as an independent risk factor for recurrence in stage IA1 patients (OR, 12.14; p=0.01). Conclusion: For stage IA1 patients with negative resection margin and no LVSI, conization can be an ideal treatment modality. For stage IA2 patients, more conservative surgery such as simple hysterectomy may be considered. LVSI is an independent risk factor for recurrence in patients with stage IA1 cervical cancer.

The degradation of synthetic rubber surfaces by the adsorption of biofilms

Charles Darko,Benhao Xin,Jiaxin Liu,Benliu Wang,Zihan Hu,Li Chen,Jie Zhang 한국고분자학회 2023 Macromolecular Research Vol.31 No.10

Biofilms are said to feed on oil contents found in synthetic rubber compounds used in sealing, pipeline and water separation valve applications but the extent of the degradation is not known. This work provides a way of characterizing the microscopic degradation as a result of the microbial adsorption on the rubber compound surfaces. Pseudomonas aeruginosa bacteria were grown on ethylene propylene diene monomer (EPDM) rubber compounds having increasing oil amounts. Results revealed that the microorganisms adhered and fed more on the oil-rich surfaces than those with less oil or oil-less surfaces and promoted smooth morphologies with reduced surface roughness values. Furthermore, elongation at break results from tensile test measurement showed an increase in stiffness with increasing oil amount after the bacteria degradation. This work supports rubber engineers when selecting rubber compounds for water contact applications.