Improved biodegradation of polyvinyl alcohol by hybrid nanoflowers of degrading enzymes from Bacillus niacini

Hongjie Bian,Gaoyang Wang,Mengfei Cao,Ziyuan Wang,Jiandong Cui 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6

Polyvinyl alcohol (PVA) is a synthetic polymer that is difficult to degrade in nature. In this study, we synthesized PVA-degrading enzymes (PVAase)-Cu3(PO4)2 hybrid nanoflowers by using crude PVAase from Bacillus niacini for PVA degradation. The influences of PVAase concentration, Cu2+ concentration, and incubation time on the nucleation and activity of the PVAase hybrid nanoflower were investigated. The maximal activity recovery of the PVAase hybrid nanoflower was approximately 85% at 0.25 mg/mL of PVAase, 0.36mM Cu2+, and 72 h incubation time. The optimum temperature and pH of PVAase did not change before and after immobilization. Compared with free PVAase, the PVAase hybrid nanoflower showed high thermal stability and storage stability. Additionally, the PVAase hybrid nanoflower displayed excellent reusability after eight cycles and promising PVA degradability, indicating its potential application in PVA degradation.

Development of Testing Device for Critical Current Measurements for HTS/LTS

Qiuliang Wang,Yinming Dai,Baozhi Zhao,Shousen Song,Zhiqiang Cao,Shunzhong Chen,Quan Zhang,Housheng Wang,Junsheng Cheng,Yuanzhong Lei,Bai Ye,Xian Li,Jianhua Liu,Shangwu Zhao,Hongjie Zhang,Xinning Hu,Ch IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3

<P>For the goal of superconducting magnet applications in the advanced testing device for high temperature superconducting (HTS) wire and sample coils, a wide bore conduction-cooled superconducting magnet with available warm bore of phi 186 mm and center field of 5 T for the background magnetic field applications was designed and fabricated and tested. A sample cryostat with two GM cryocoolers is inserted in the background magnet. The system allows measurements to be performed in a repeatable and reliable fashion. The detailed design, fabrication and thermal analysis are presented in the paper.</P>

A Pilot Study of Clinical Evaluation and Formation Mechanism of Irritable Bowel Syndrome-like Symptoms in Inflammatory Bowel Disease Patients in Remission

( Haiyang Wang ),( Xiaojing Zhao ),( Xiufang Cui ),( Meifeng Wang ),( Chunhua Jiao ),( Jiajia Li ),( Yan Yang ),( Yi Li ),( Hongjie Zhang ) 대한소화기기능성질환·운동학회 2021 Journal of Neurogastroenterology and Motility (JNM Vol.27 No.4

Background/Aims Some inflammatory bowel disease (IBD) patients in remission suffer from irritable bowel syndrome (IBS)-like symptoms (IBD-IBS). The pathogenesis has not yet been elucidated. The study aim is to evaluate relationships among quality of life (QOL), psychological status, and visceral sensitivity, and explore the formation mechanism of IBD-IBS. Methods Forty-seven patients with Crohn’s disease in remission, 24 ulcerative colitis in remission, 26 IBS, and 20 healthy controls were included in the study. The abdominal pain, QOL, anxiety, and depression were evaluated through questionnaires. Visceral sensitivity was measured by rectal balloon distension. The serum levels of 5-hydroxytryptamine (5-HT) and nerve growth factor (NGF) were measured by enzyme-linked immunosorbent assay. The expressions of tryptase, 5-HT, NGF, and related receptors in colonic tissues were detected by immunohistochemistry and western blot. Results Prevalence of IBS-like symptoms in Crohn’s disease and ulcerative colitis patients in clinical remission was 29.8% and 50.0%, respectively. The QOL was lower, the anxiety/depression scores were higher in IBD-IBS patients than those without IBS-like symptoms. Additionally, patients with IBD-IBS existed visceral hypersensitivity. Besides, abdominal pain was associated with poor QOL, visceral hypersensitivity, anxiety, and depression in IBD-IBS patients. The number of mast cells (MCs) and expressions of 5-HT, NGF, and related receptors were higher in IBD-IBS patients than those with no such symptoms. The serum levels of 5-HT and NGF positively correlated with abdominal pain and visceral hypersensitivity. Conclusion IBD-IBS patients may have low QOL and psychological abnormalities, as wells as visceral hypersensitivity which may be related to increased 5-HT and NGF levels released from activated mast cells. (J Neurogastroenterol Motil 2021;27:612-625)

Infrared Semiconducting Transition-Metal Dichalcogenide Lasing with a Silicon Nanocavity

Hongji Li,Hanlin Fang,Jianling Xiao,Juntao Li,Yue Wang 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.3

The remaining challenge for silicon photonics is creating a light-emitter on chip. Recently, a special group of two-dimensional materials, semiconducting transition-metal dichalcogenides, have been developed. These materials demonstrate unique electronic properties and excellent optoelectronic performance, opening up new possibilities to finally overcome this challenge. In this letter, we report a novel nano-scale silicon laser source, which was achieved by combining a far-field optimized silicon photonic crystal cavity and a two-dimensional gain material, tri-layer molybdenum ditelluride. When an optical continuous-wave pump was employed, the maximum lasing output power obtained was at a wavelength of 1080 nm. Such output power shows that this novel source has great potential for use in on-chip optical communication.

Development of Strain Measurement in Superconducting Magnet Through Fiber Bragg Grating

Hongjie Zhang,Fanping Deng,Qiuliang Wang,Luguang Yan,Yingming Dai,Keeman Kim IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2

<P>Temperature and strain responses of fiber Bragg grating sensors were measured in cryogenic environment. With temperature from room temperature down to 77 K or 4.2 K, the temperature response was found to be relatively linear above 100 K, and the temperature sensitivity decreases with the decrease of temperature, and to approximately zero for temperature less than 50 K. Technologies were developed to eliminate the multi-peaks in strain experiment, so the strain response was measured at 77 K, and was found to be linear at constant temperatures.</P>

Layered 50Cr6Ni2/Stellite X-40 Multi-material Fabricated by Direct Laser Deposition: Characterization and Properties

Hongjie Wu,Suiyuan Chen,Chenyi Zhang,Jing Liang,Changsheng Liu,Mei Wang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.1

Fretting damage under high temperature corrosion and wear condition is one of the main factors that cause the failure of thekey parts of mechanical and electrical equipment, and laser cladding wear-resistant and corrosion-resistant coating is the maintechnology to repair these failure key parts. In this paper, the layered 50Cr6Ni2/Stellite X-40 multi-material was prepared bydirect laser deposition (DLD) using wear-resistant Fe-based alloy and corrosion-resistant Co-based alloy, to meet the needsof repair and remanufacturing of key parts with fretting damage. The results show that the layered 50Cr6Ni2/Stellite X-40composite material retains their respective microstructures and excellent properties. The microstructure of the 50Cr6Ni2layer mainly contains martensite and granular bainite, the microstructure of the Stellite X-40 layer consists of dendrite andeutectic structure. The layered 50Cr6Ni2/Stellite X-40 composite material has both good wear resistance (wear mass loss is1.0 mg) and good corrosion resistance (− 0.37549 of Ecorrand 0.00032 of icorr). The DLD layered 50Cr6Ni2/Stellite X-40composite material could meet the demand of short stress path rolling mill remanufacturing.

An S-scheme photocatalyst constructed by modifying Ni-doped Sn3O4 micro-flowers on g-C3N4 nanosheets for enhanced visible-light-driven hydrogen evolution

Dandan Wang,Zhaoxin Lin,Chun Miao,Wei Jiang,Hongji Li,Chunbo Liu,Guangbo Che 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-

Carbon nitrides (g-C3N4) is considered to be the prospective semiconductor photocatalyst for photocatalytic H2 evolution. Nevertheless, it suffers from low charge transfer efficiency and fewer metal active sites. Thereby, Ni-Sn3O4/g-C3N4 photocatalysts were constructed by anchoring Ni-doped Sn3O4 micro-flowers on g-C3N4 via a feasible and straightforward solvothermal treatment. The prepared Ni-Sn3O4/g-C3N4 S-scheme heterojunction could improve the transfer and separation efficiency of photo-generated electron-hole pairs by facilitating the electrons transfer from Ni-Sn3O4 to g-C3N4. Moreover, the photocatalytic H2 production performance was ameliorated due to the established internal electric field and the energy band bending in Ni-Sn3O4/g-C3N4 S-scheme heterojunction. Meanwhile, the doping Ni in Sn3O4 exposed more active sites in Ni-Sn3O4/g-C3N4 heterojunction for producing H2. As a result, Ni-Sn3O4/g-C3N4-5 photocatalyst exhibited outstanding H2 yields of 1961 µmol h−1 g−1 under visible light irradiation in comparison with pure Ni-Sn3O4 (12 µmol h−1 g−1) and bared g-C3N4 (1391 µmol h−1 g−1). Furthermore, the S-scheme mechanism in Ni-Sn3O4/g-C3N4 heterojunction for producing H2 by oxidizing H2O was proposed. This study provides helpful guide for developing efficient g-C3N4-based photocatalytic systems.

Uncertainty analysis of heat transfer of TMSR-SF0 simulator

Jiajun Wang,Ye Dai,Yang Zou,Hongjie Xu Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.2

The TMSR-SF0 simulator is an integral effect thermal-hydraulic experimental system for the development of thorium molten salt reactor (TMSR) program in China. The simulator has two heat transport loops with liquid FLiNaK. In literature, the 95% level confidence uncertainties of the thermophysical properties of FLiNaK are recommended, and the uncertainties of density, heat capacity, thermal conductivity and viscosity are ±2%, ±10, ±10% and ±10% respectively. In order to investigate the effects of thermophysical properties uncertainties on the molten salt heat transport system, the uncertainty and sensitivity analysis of the heat transfer characteristics of the simulator system are carried out on a RELAP5 model. The uncertainties of thermophysical properties are incorporated in simulation model and the Monte Carlo sampling method is used to propagate the input uncertainties through the model. The simulation results indicate that the uncertainty propagated to core outlet temperature is about ±10 ℃ with a confidence level of 95% in a steady-state operation condition. The result should be noted in the design, operation and code validation of molten salt reactor. In addition, more experimental data is necessary for quantifying the uncertainty of thermophysical properties of molten salts.

Design of online damage images detection system for large-aperture mirrors of high power laser facility based on wavefront coding technology

Fang, Wang,Qinxiao, Liu,Dongxia, Hu,Hongjie, Liu,Tianran, Zheng Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.9

The laser transport system of the high power laser facility is mainly composed of large-aperture laser transport mirrors (TMs). Obtaining the high-resolution online damage images during the operation, which is of great significance for operating safely of the mirrors and the facility. Based on wavefront coding, pan-tilt scanning and image stitching technologies, an online laser-damage images detection system is designed, and it can achieve high-precision detection of surface characteristics of large-aperture laser transport mirrors. The preliminary simulation proves that the system can solve the depth of field matching problem caused by pan-tilt tilt imaging and achieve higher resolution.

青少年犯罪的几点原因及预防教育探究 -基于大连13岁男孩杀害10岁女童案-

华泓洁 ( Hua-hongjie ),王楠 ( Wang-nan ) 경상대학교 교육연구원(구 경상대학교 중등교육연구소) 2020 중등교육연구 Vol.32 No.2

통설에 의하면 청소년 범죄란 6~25세 나이에 실행한 치안관리법과 도덕규범을 넘어서 형법을 위반한 범죄행위라고 정의하고 있다. 근래에 사회의 끊임없는 발전 및 복잡한 사회구조의 변화와 더불어 청소년의 범죄률도 높아지고 지고 있다. 인터넷 정보가 날로 발달되여 불량한 정보를 심신의 발전이 미약한 청소년에게 악영향을 주고 있는 것이 그중의 한가지 원인이다. 이러한 청소년 범죄 상황을 사회적으로는 여러 방면으로 관심과 중시를 하고 있다. 청소년 범죄 주체의 특수성, 범죄 행위의 악령성, 저령화, 황당한 목적성 등이 현재의 특징 임을 동감하고 있다. 그 배후에는 청소년 교육에 대한 부족과 건전한 청소년의 신심 발전에 대한 홀시가 주요 원인이라고 분석되고 있다. 그 외에도 가정의 불화, 학교의 중시 결여, 사회의 관용 등도 원이이 된다. 현 시점에 있어서 이러한 문제의 원인에 대하여 국가는 가능한 직권의 범위 내에서 청소년의 범죄예방 및 처벌에 대한 조치를 재구축 및 보완을 하고 청소년에 대한 교육과 교정을 통하여 하루 빨리 사회에 복귀시키는 것이 바람직 하다. 특히 학교와 가정에서는 청소년에 대하여 더욱 많은 사랑과 관심을 주어서 그들의 자폐를 피면해야 할 것이다. 그리고 사회적으로 관용을 배풀어 죄를 범한 청소년에 대하여 2차적 피해를 주지 말아야 재범의 가능성을 억제할 수 있게 되며 사회의 안정한 질서 유지에도 도움이 될 것이다. Some scholars believe that juvenile delinquency refers to the criminal offence and violations of public security administration and moral norms committed by people aged from 6 to 25.With the continuous development of the society and information network, the frequency of juvenile delinquency is becoming higher and higher. Nowadays, the situation of juvenile delinquency has also attracted the attention of all walks of life.Due to the particularity of the subject of crime, juvenile delinquency presents the characteristics of aggravated circumstance, lowering age and absurd purpose, which reflects the lack of education for teenagers and the neglect of their mental health problems from their parents and the society.The factors leading to juvenile delinquency include family disharmony, school neglect, social intolerance and so on. In practice, In view of the above reasons and characteristics, the state should construct improved juvenile delinquency precautions and punishment measures to help them return to the society as soon as possible and restore the normal social order through the education and reform of minors within the scope of its functions and powers. Schools and parents should give more attention and care to teenagers to avoid the formation of autistic personalities in adolescence.In addition, all walks of life should also increase tolerance for these teenagers, avoid looking at juvenile delinquents in the vision of prejudice to reduce the secondary harm to them, so as to reduce the possibility of juvenile delinquency and maintain social stability and order.