Fouling characteristics of MgO particles under subcooled flow boiling

Siyuan Wang,Zhiming Xu,Jingtao Wang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.3

In order to investigate the particulate fouling characteristics, experiments of water based magnesia particulate suspensions were carried out in an annular test section under subcooled flow boiling. The sizes of magnesia particles were 40 nm and 10 μm, respectively. The influence of particle concentration, heat flux, mass flow rate and inlet temperature on fouling resistance were investigated, and the Chilton-Colburn analogy was applied to analyze the fouling process. The results show that the asymptotic value of fouling resistance increases with the increase of particle concentration. The asymptotic value of fouling resistance tends to fall when mass flow rate increases. As inlet temperature increases, there will be an obvious drop in the asymptotic value of fouling resistance. Regarding to heat flux, opposite variation trend was found between nano and micro-magnesia particles when changing the heat flux. Moreover, there is an obvious difference in asymptotical value of fouling resistance between nano-particles and micro-particles.

Effects of high power pulsed microwave on the enhanced color and flavor of aged blueberry wine

Siyuan Liu,Shuangjian Li,Siyuan Li,Ying Wang,Linlin Fan,Jianzhong Zhou 한국식품과학회 2024 Food Science and Biotechnology Vol.33 No.1

A new method of high-power pulsed microwave (HPPM) was applied to accelerate the aging of blueberry wine. The color changes of blueberry wines during aging were investigated through Chemical Wine Age and CIE-LAB measurement. Results showed that the blueberry wines treated by HPPM at low frequencies (50 and 100 Hz) exhibited improved color characteristics with L* value reaching 47.04 at 100 Hz, an increased maturity of wine body, and a shortened chemical wine age from 90 days to 75 days. Moreover, the aroma changes determined by GC-MS showed that HPPM accelerated the formation of esters in blueberry wine, which were increased by 18.44% and 56.97% respectively under the conditions of 50 and 150 Hz. The formation of acid substances was reduced compared with the original wine, with contents of acetic acid, caproic acid, and octanoic acid of 29.46 µg/mL, 15.60 µg/mL, 17.74 µg/mL, respectively, displaying an enhanced wine flavor.

Short-duration chemoprophylaxis might reduce incidence of deep vein thrombosis in Asian patients undergoing total knee arthroplasty

Zhang Siyuan,Htet Kway Swar,Tan Xin Yang,Wang Xinyu,Wang Wilson,Chua Weiliang 대한슬관절학회 2020 대한슬관절학회지 Vol.32 No.-

Venous thromboembolism (VTE) is a serious complication that may occur after total knee arthroplasty (TKA), leading to the recommendation of routine chemoprophylaxis by international guidelines. This study aims to determine if short-duration chemoprophylaxis after TKA reduces the incidence of VTE in an Asian population.A retrospective study of 316 patients who underwent unilateral primary TKA between 1 January 2011 and 31 December 2013 was conducted. All patients received mechanical prophylaxis. One hundred seventeen patients (37%) received additional chemoprophylaxis, whereas 199 patients (63%) did not. A Doppler ultrasound (DUS) of both lower limbs was conducted for all patients within 6 days after surgery (median = 3 days) to assess for both proximal and distal DVT. Chemoprophylaxis in the form of enoxaparin (low molecular weight heparin; LMWH), aspirin, or heparin was administered until patients had a normal DUS, for a median duration of 4 days. Patients were followed up clinically for a minimum of 6 months to monitor for delayed or recurrent VTE and at least 2 years for patient-reported outcome measures. Overall, 24 patients (7.59%) developed deep vein thrombosis (DVT): three proximal and 21 distal DVTs. Twenty-three of the 24 patients were asymptomatic. Twenty of 199 patients (10.05%) with only mechanical prophylaxis developed DVT, whereas four of 117 patients (3.42%) with additional chemoprophylaxis developed DVT. Multivariate analysis showed that chemoprophylaxis use was associated with reduced incidence of DVT (odds ratio = 0.19, p value = 0.011). Other factors associated with increased DVT incidence include female gender (odds ratio = 5.45, p value = 0.034), positive history of cancer (odds ratio = 5.14, p value = 0.044), and increased length of stay in hospital (odds ratio = 1.19, p value < 0.001). Our study has shown that despite the low incidence of DVT in Asian patients undergoing TKA, short-duration chemoprophylaxis might be effective in reducing the incidence of DVT. However, most DVTs observed in our study were distal and may be of limited clinical significance. Further studies are needed to investigate the impact of chemoprophylaxis use on the incidence of PE and overall mortality rates among Asian patients.

TEM fitting considering TEPs of contact interface of meshing gear

Xigui Wang,Siyuan An,Yongmei Wang,Jiafu Ruan,ShuE Ji 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.10

This topic aims to clarify the method of optimizing tooth surface modification (TSM) fitting under thermoelastic lubrication (TEL) conditions to reveal the most popular and concerning mechanism issues in mechanical engineering. A traditional TSM numerical method has played an increasingly important role in our basic understanding of thermoelastic properties (TEPs) under TEL conditions, which is undoubtedly affirmative and effective. This subject involves the TSM fitting of the theoretical tooth surface superimposed structure, and performs 3D and diagonal modification optimization design, obtains the modified surface position and normal vectors, a variety of optimized modification models are established and complex curved surfaces are analyzed to fit the actual Interface thermoelastic contact numerical simulation, which has been further demonstrated and expressed in actual key working conditions and multiple influencing parameters, thereby reducing transmission error and vibration noise in order to improve gear meshing thermoelastic anti-scuffing load-bearing performance (TEASLBP).

“上帝之扫帚”抑或“绝对之铁骑”

王思远(Siyuan Wang) YIXIN 출판사 2024 International journal of Marxism studies Vol.1 No.2

Hegel’s concept of the nation is the rational being of his philosophy of spirit, and the national spirit is the absolute point of connection between the subjective spirit, the objective spirit, and the absolute spirit. In contrast to the establishment of individual sovereign states in the internal state law, the national spirit is the potential individual of the objective spirit leading to the representation of the world spirit on the basis of the external state law as well as the world history (law), but the Hegelian philosophy took a long time to reach this theoretical construction. The principles formed by the Mongolian nation represent the substantive principles of the Eastern nation-state, which is one of the necessary links of the world history into the world spirit. The Mongolian principles were perfected in the natural provisions of the subjective spirit, in the ethical provisions of the objective spirit, and in the religious provisions of the absolute spirit. For Hegel, the national spirit conveys his new moulding of the spiritual community, and the Mongolian principle embodies the original reality of the free spirit. 黑格尔的民族概念是其精神哲学的理性存在者,民族精神是联结主观精神、客观精神以及绝对精神的绝对直通点。相较于内部国家法中单个主权国家的建立,民族精神是客观精神依据外部国家法以及世界历史(法)通往世界精神代表的潜在个体,然而黑格尔哲学达成这一理论建构却经历了漫长的过程。蒙古民族精神代表了东方民族国家的实体性原则,并作为世界历史进入世界(普遍)精神的必经环节之一。黑格尔阐述的蒙古原则在主观精神中的自然规定、客观精神中的伦理规定以及绝对精神中的宗教规定中得以系统性建构起来。对于黑格尔而言,民族精神传达了主权国家在世界历史中个体性原则的精神重塑,蒙古原则体现了自由精神的原初实在。

Particulate Matter 2.5 Causes Deficiency in Barrier Integrity in Human Nasal Epithelial Cells

Mu Xian,Siyuan Ma,Kuiji Wang,Hongfei Lou,Yang Wang,Luo Zhang,Chengshuo Wang,Cezmi A. Akdis 대한천식알레르기학회 2020 Allergy, Asthma & Immunology Research Vol.12 No.1

Purpose: The effect of air pollution-related particulate matter (PM) on epithelial barrier function and tight junction (TJ) expression in human nasal mucosa has not been studied to date. This study therefore aimed to assess the direct impact of PM with an aerodynamic diameter less than 2.5 μm (PM2.5) on the barrier function and TJ molecular expression of human nasal epithelial cells. Methods: Air-liquid interface cultures were established with epithelial cells derived from noninflammatory nasal mucosal tissue collected from patients undergoing paranasal sinus surgery. Confluent cultures were exposed to 50 or 100 μg/mL PM2.5 for up to 72 hours, and assessed for 1) epithelial barrier integrity as measured by transepithelial resistance (TER) and permeability of fluorescein isothiocyanate (FITC) 4 kDa; 2) expression of TJs using real-time quantitative polymerase chain reaction and immunofluorescence staining, and 3) proinflammatory cytokines by luminometric bead array or enzyme-linked immunosorbent assay. Results: Compared to control medium, 50 and/or 100 μg/mL PM2.5-treatment 1) significantly decreased TER and increased FITC permeability, which could not be restored by budesonide pretreatment; 2) significantly decreased the expression of claudin-1 messenger RNA, claudin-1, occludin and ZO-1 protein; and 3) significantly increased production of the cytokines interleukin-8, TIMP metallopeptidase inhibitor 1 and thymic stromal lymphopoietin. Conclusions: Exposure to PM2.5 may lead to loss of barrier function in human nasal epithelium through decreased expression of TJ proteins and increased release of proinflammatory cytokines. These results suggest an important mechanism of susceptibility to rhinitis and rhinosinusitis in highly PM2.5-polluted areas.

Creative Illustration of Traditional Chinese Medicine

Qi Siyuan,Sun Yifei,Wang Yilin 한국콘텐츠학회 2023 한국콘텐츠학회 ICCC 논문집 Vol.2023 No.12

Creative Illustration of Traditional Chinese Medicine

Qi Siyuan,Sun Yifei,Wang Yilin 한국콘텐츠학회 2023 ICCC International Digital Design Invitation Exhib Vol.2023 No.12

Thermal-hydraulic analysis of He-Xe gas mixture in 2×2 rod bundle wrapped with helical wires

Chenglong Wang,Siyuan Chen,Wenxi Tian,G.H. Su,Suizheng Qiu Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7

Gas-cooled space reactor, which adopts He-Xe gas mixture as working fluid, is a better choice for megawatt power generation. In this paper, thermal-hydraulic characteristics of He-Xe gas mixture in 2×2 rod bundle wrapped with helical wires is numerically investigated. The velocity, pressure and temperature distribution of the coolant are obtained and analyzed. The results show that the existence of helical wires forms the vortexes and changes the velocity and temperature distribution. Hot spots are found at the contact corners between helical wires and fuel rods. The highest temperature of the hot spots reach 1600K, while the mainstream temperature is less than 400K. The helical wire structure increases the friction pressure drop by 20%-50%. The effect extent varies with the pitch and the number of helical wires. The helical wire structure leads to the reduction of Nusselt number. Comparing thermal-hydraulic performance ratios (THPR) of different structures, the THPR values are all less than 1. It means that gas-cooled space reactor adopting helical wires could not strengthen the core heat removal performance. This work provides the thermal-hydraulic design basis for He-Xe gas cooled space nuclear reactor.

Magnetic Resonance Imaging-Related Anatomic and Functional Parameters for the Diagnosis and Prognosis of Chiari Malformation Type I: A Systematic Review and Meta-analysis

Zairan Wang,Zhimin Li,Shiyuan Han,Xianghui Hu,Siyuan Pang,Yongning Li,Jun Gao 대한척추신경외과학회 2024 Neurospine Vol.21 No.2

Objective: Imaging parameters of Chiari malformation type I (CMI) development are not well established. This study aimed to collect evidence of general or specific imaging measurements in patients with CMI, analyze indicators that may assist in determining the severity of CMI, and guide its diagnosis and treatment. Methods: A comprehensive search was conducted across various databases including the Cochrane Library, PubMed, MEDLINE, Scopus, and Embase, covering the period from January 2002 to October 2023, following predefined inclusion criteria. Meta-analyses were performed using RevMan (ver. 5.4). We performed a quantitative summary and systematic analysis of the included studies. This study was registered in the PROSPERO (International Prospective Register of Systematic Reviews) prior to initiation (CRD42023415454). Results: Thirty-three studies met our inclusion criteria. The findings indicated that out of the 14 parameters examined, 6 (clivus length, basal angle, Boogard’s angle, supraocciput lengths, posterior cranial fossa [PCF] height, and volume) exhibited significant differences between the CMI group and the control group. Furthermore, apart from certain anatomical parameters that hold prognostic value for CMI, functional parameters like tonsillar movement, obex displacement, and cerebrospinal fluid dynamics serve as valuable indicators for guiding the clinical management of the disease. Conclusion: We collated and established a set of linear, angular, and area measurements deemed essential for diagnosing CMI. However, more indicators can only be analyzed descriptively for various reasons, particularly in prognostic prediction. We posit that the systematic assessment of patients’ PCF morphology, volume, and other parameters at a 3-dimensional level holds promising clinical application prospects.