Isoperistaltic side-to-side anastomosis for the surgical treatment of Crohn disease

Wenhao Chen,Junjie Zhou,Min Chen,Congqing Jiang,Qun Qian,Zhao Ding 대한외과학회 2022 Annals of Surgical Treatment and Research(ASRT) Vol.103 No.1

Purpose: Increasing evidence has shown an association of surgical technique, particularly anastomotic configuration, with postoperative recurrence of CD. This pilot study aimed to evaluate short-term outcomes of isoperistaltic side-to-side anastomosis (ISSA) employed on Crohn disease (CD) patients. Methods: Data were retrieved from a prospectively maintained database. Postoperatively, all patients were followed up with close endoscopic (ileocolonoscopy) surveillance. Results: From January 2017 to May 2021, 30 patients diagnosed with CD who underwent ISSA were compared with 45 CD patients who underwent antiperistaltic side-to-side anastomosis (ASSA). The 2 groups were comparable in baseline demographics and clinical characteristics. No significant differences were observed between groups regarding postoperative safety issues, including anastomotic leak, abdominal/pelvic abscess, length of hospital stay, readmission rate within 30 days, etc. At postoperative 24th month, reduced endoscopic recurrence was observed in the ISSA group compared with that in the ASSA group (18 of 24, 75.0%, . 36 of 38, 94.7%; P = 0.024). Regarding surgical recurrence, there was 0% in the ISSA group . 4.4% (2 of 45) in the ASSA group (P = 0.510). Conclusion: In this study, we aimed to explore the influence of ISSA on postoperative recurrence in CD patients, and the preliminary results show that ISSA was technically safe and feasible, and appears to be effective in reducing postoperative recurrence in CD patients. However, our conclusion was underpowered due to small sample size and inadequate follow- up. We proposed ISSA be considered as another alternative option in the toolbox of inflammatory bowel disease surgeons when performing anastomosis on CD patients.

The Research Trend of Employability in HE From 2000 to 2019--A Visual Analysis Using Citespace

( Wenhao Chen ),( Youngsup Hyun ) 경북대학교 중등교육연구소 2020 Asia Pacific Journal of Educational Research Vol.3 No.2

Employability is about having the capability to gain initial employment, maintain employment and obtain new employment. Research on employability in each country is increasing because of the serious situation of graduate unemployment. There are lots of studies on employability from the range of its concept, key elements, to supports to raise the employability in higher education. Employability has been variously defined in terms of organization and policy. As long as the various studies about employability were published, it had been difficult to identify a big picture and directions for future research. CiteSpace, which is designed to analyze existing literature by co-citation networks, can provide a clear picture of the research in this field. This paper investigated and visualized the research trends of employability in higher education around the world. We constructed a framework for trends analyses based on theoretical reviews. All the data was collected on Scopus, one of the largest abstract and citation database of peer-reviewed literature. 661 articles published in international journals in past 2 decades were collected and analyzed. In terms of contributing countries, the major driving force is from the United Kingdom, and Australia. Yorke M, Harvey L and Tomlinson M are top cited authors. In terms of the popularity of research topics, recent employability research has mainly focused on university activities, class act, career planning, lunar side and international internship.

Investigation on characteristics of pulverized coal dense-phase pneumatic conveying under high pressure

Chen Xiaoping,Fan Chunlei,Liang Cai,Pu Wenhao,Lu Peng,Zhao Changsui 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.3

of dense-phase pneumatic conveying of pulverized coal were carried out in a test facility witha conveying pressure up to 4 MPa. The influence of fluidization nitrogen flow rate, the flow rate of supplementarysolid mass flow rate was investigated. Test results indicate that with the increase in fluidization nitrogen flow rate, thesolid mass flow rate increases, and the solids to gas ratio increases at first and then declines. When the fluidization ofpulverized coal in the sending vessel becomes intensive, with the increase in supplementary nitrogen flow rate, thesolids to gas ratio declines and the solid mas flow rate increases. And the solid mass flow rate increases linearly withthe increase in presure diference between two hoppers. The experimental results provide a database for the design

Effect of post-annealing conditions on electrical and optical properties of AZO thin film on flexible PET substrates

Wenhao YAO,Kun LIU,Shulei CHEN,Xiaojie LIU,Dongyang WANG,Yingchao NING,Dechun BA,Guangyu DU,Yaoshuai BA 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Nitrate control strategies in an activated sludge wastewater treatment process

Wenhao Shen,Erpan Tao,Xiaoquan Chen,Dawei Liu,류홍빈 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.3

We studied nitrate control strategies in an activated sludge wastewater treatment process (WWTP) basedon the activated sludge model. Two control strategies, back propagation for proportional-integral-derivative (BP-PID)and adaptive-network based fuzzy inference systems (ANFIS), are applied in the WWTP. The simulation results showthat the simple local constant setpoint control has poor control effects on the nitrate concentration control. However,the ANFIS (4*1) controller, which considers not only the local constant setpoint control of the nitrate concentration,but also three important indices in the effluent--ammonia concentration, total suspended sludge concentration and totalnitrogen concentration--demonstrates good control performance. The results also prove that ANFIS (4*1) controllerhas better control performance than that of the controllers PI, BP-PID and ANFIS (2*1), and that the ANFIS (4*1)controller is effective in improving the effluent quality and maintaining the stability of the effluent quality.

Ultra-thin Metallized Glass Fabric Coated with Chitosan and Reduced Graphene Oxide for Electromagnetic Shielding with Excellent Heat Dissipation and Self-Cleaning

Meimei Chen,Shan Jiang,Ce Cui,Wenhao Bai,Jianyu Zhai,Ronghui Guo 한국섬유공학회 2023 Fibers and polymers Vol.24 No.8

With the rapid development of modern technology, more and more electronic equipment had entered people’s life, causing serious electromagnetic pollution. In this study, a lightweight, ultra-thin and high electromagnetic shielding film was fabricated by copper electroless deposition after solution immersion coating method combining chitosan (CTS) and reduced graphene oxide on glass fabric (Cu/RGO-CTS-coated glass fabric). Chitosan and RGO had synergistic effect for copper deposition, enhancing electrical conductivity and electromagnetic shielding property. The prepared fabric showed superb conductivity of 8589.3 S/cm and the shielding effectiveness of the Cu/RGO-CTS-coated glass fabric showed as high as 93.6 dB at ultra-thin thickness of 92.4 μm (SSE/t = 3868.8 dB cm2 g-1). Thermal conductivity, antibacterial and hydrophobic properties were also studied. Compared with untreated glass fabric, thermal conductivity of Cu/RGO-CTS-coated glass fabric increased by 437%, protecting electronic equipment from adverse effects at high temperature. Cu/RGO-CTS-coated glass fabric had inhibitory effect on Staphylococcus aureus and Escherichia coli, which could prolong the service life and maintain the appearance of the fabric. Cu/RGO-CTS-coated glass fabric also showed hydrophobicity with self-cleaning function, making it possible for the composite material to be used in many fields such as aerospace industry, microelectronic devices, and transportation to resist electromagnetic interference in high humidity and high pollution environment.

CFD simulation of coal-water slurry flowing in horizontal pipelines

Liangyong Chen,Wenhao Pu,Changsui Zhao,Yufeng Duan 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4

An Eulerian multiphase approach based on kinetic theory of granular flow was used to simulate flow of coal-water slurries (CWS) in horizontal pipelines. The RNG k-ε turbulent model was incorporated in the governing equation to model turbulent two-phase flow with strong particle-particle interactions. In this model, the coal particles with bimodal distribution were considered as two solid-phase components, and the moment exchange between solid and liquid as well as that between solid and solid were accounted for. The model was firstly validated with pressure gradient and concentration profile data from the open literature, and then validated with pressure gradient data of the authors’ experiments. The effects of influx velocity, total influx concentration and grain composition were numerically investigated, and the results have displayed some important slurry flow characteristics, such as constituent particle concentration distribution and velocity distribution as well as pressure gradients, which are very difficult to display in the experiments. The results suggest that both gravity difference between large and small particles and strong particleparticle interaction had significant effects on concentration distribution as well as velocity distribution.

Silicon Mediated Different Roles in Alleviation of Cadmium Toxicity in Two Cypress Varieties

Bin Guo,Wenhao An,Nengfei Ding,Chen Liu,Qinglin Fu,Hua Li,Ningyu Li,Yicheng Lin 한국토양비료학회 2014 한국토양비료학회 학술발표회 초록집 Vol.2014 No.6

Flow characteristics and dynamic behavior of dense-phase pneumatic conveying of pulverized coal with variable moisture content at high pressure

Liang Cai,Chen Xiaoping,Zhao Changsui,Pu Wenhao,Lu Peng,Fan Chunlei 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3

Experiments of dense-phase pneumatic conveying of pulverized coal using nitrogen were performed in an experimental test facility with the conveying pressure up to 4MPa and the solid-gas ratio up to 500 kg/㎥. The influences of the total conveying differential pressure, the moisture content, the superficial velocity and the pressure on the mass flow rate and the solid-gas ratio were investigated. Shannon entropy analysis of pressure fluctuation time series was developed to reveal the flow characteristics. Based on the distribution of the Shannon entropy in the different conditions, the flow stability and the evolutional tendency of Shannon entropy in different regimes and the regime transition processes were obtained. The results indicate that the solid gas ratio and Shannon entropy rise with increase in the total conveying differential pressure. A phase diagram and Shannon entropy reveal preferable regularity with superficial velocity. Shannon entropy is different for the different flow regimes, and it can be used to identify the flow regimes. As the moisture content increases, the mass flow rate, the pressure drop and Shannon entropy decrease. Shannon entropy rises with increase in pressure drop.

A New Combined Support Technology to Prevent the Failure of the Existing Metro Station Induced by Unilateral Excavation

Feicong Zhou,Wenhao Fan,Ping Zhou,Mao Chen,Shougen Chen,Zhijie Wang,Yifan Jiang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.3

This study establishes a 3-D simulation model based on a real project, which reveals the problem that the metro structure deformation induced by unilateral excavation without any support exceeds the safety threshold. According to the metro structure deformation warning area, this study proposes a support technology that combines cover plate braces and diagonal steel braces. The research shows that the lateral deformation reduction ratio of the metro station under the diagonal steel brace is about 10% − 20%. The deformation reduction ratio under the cover plate brace is about 35% − 40%. To ensure construction safety, this study adopts the optimal support combination of 3 cover plates and 6+9+11 steel pipes. Monitoring feedback and simulation prediction shows that the comprehensive support system can reduce structural deformation by 56.1%, and effectively control the deformation within a safe range.