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Huaiyu Wen,Yao Xiao,Yi Han,Yuqian Zhao,Shan Wang 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.2
Wind turbine gear is an essential part of a wind turbine, and the induction hardening is an important treatment method for its surface strengthening. However, when scanning induction heating, the end position is the weak part of the process. In this paper, the dynamic evolution process of the end temperature field was studied during the scanning induction heating of wind turbine gear. It was found that a significant hysteresis emerge in the temperature field of the lateral tooth profile before the scanning heating reaches the steady state stage. The reason lies in the poor heat transfer caused by the gear end structure, and the combined effect of induced eddy current heating in the region. The hysteresis distance of the temperature field at the end, is positively correlated with the inductor scanning speed within a certain range. The material parameters of gear are affected by the change of temperature, which in turn affects the heating process. The induced magnetic field on the two tooth flanks has an obvious forward movement phenomenon under the combined action of the gear temperature and the magnetic flux concentrator. The steady-state temperature field forms a loop on both flanks. Increasing the movement speed within a certain range, a gap would appear at the lower boundary of the ring. The evolution process of the end temperature of the gear scanning induction heating is clarified in this paper, which would provide a research foundation for improving the end heating quality and precise control.
Shuqun Zhang,Bo Hou,Huaiyu Yang,Zhili Zuo 대한약학회 2016 Archives of Pharmacal Research Vol.39 No.5
Acetylcholinesterase (AChE) is an importantenzyme in the pathogenesis of Alzheimer’s disease (AD). Comparative quantitative structure-activity relationship(QSAR) analyses on some huprines inhibitors againstAChE were carried out using comparative molecular fieldanalysis (CoMFA), comparative molecular similarityindices analysis (CoMSIA), and hologram QSAR(HQSAR) methods. Three highly predictive QSAR modelswere constructed successfully based on the training set. The CoMFA, CoMSIA, and HQSAR models have valuesof r2 = 0.988, q2 = 0.757, ONC = 6; r2 = 0.966, q2 =0.645, ONC = 5; and r2 = 0.957, q2 = 0.736, ONC = 6. The predictabilities were validated using an external testsets, and the predictive r2 values obtained by the threemodels were 0.984, 0.973, and 0.783, respectively. Theanalysis was performed by combining the CoMFA andCoMSIA field distributions with the active sites of theAChE to further understand the vital interactions betweenhuprines and the protease. On the basis of the QSAR study,14 new potent molecules have been designed and six ofthem are predicted to be more active than the best activecompound 24 described in the literature. The final QSARmodels could be helpful in design and development ofnovel active AChE inhibitors.
Ziwei Lin,Rui Lin,Huaiyu Wu,Linghu Wu,Jieying Zeng,Jinfeng Xu,Fajin Dong 대한초음파의학회 2021 ULTRASONOGRAPHY Vol.40 No.4
Purpose: The aim of this study was to evaluate the value of elastography in the differential diagnosis of benign versus malignant testicular lesions.Methods: The PubMed, Cochrane Library, and Embase databases were searched for relevant studies. The diagnostic accuracy of elastography was evaluated using pooled sensitivity, specificity, likelihood ratio, post-test probability, diagnostic odds ratio, and by summarizing the area under the hierarchical summary receiver operating characteristic (HSROC) curve.Results: Seven studies with 568 lesions were included. The pooled sensitivity and specificity were 87% (95% confidence interval [CI], 81% to 92%) and 81% (95% CI, 65% to 90%), respectively. The pooled estimates of the positive likelihood ratio, negative likelihood ratio, and diagnostic odds ratio were 4.48 (95% CI, 2.37 to 8.47), 0.16 (95% CI, 0.10 to 0.25), and 28.11 (95% CI, 11.39 to 69.36), respectively. The area under the HSROC curve was 90% (95% CI, 88% to 93%).Conclusion: Elastography is useful for assessing the stiffness of testicular lesions and for differentiating benign from malignant lesions. Elastography can be an effective supplement to conventional ultrasonography.
Evaluation of Kinetic Parameters and Mass Transfer of Glucose-fed Granules under Hypoxic Conditions
Yuancai Chen,Shiyu Fu,Huaiyu Zhan,Che-Jen Lin,Huaixia Lan 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.6
This study demonstrated that the availability of oxygen influenc the kinetic parameters of sludge granules for the utilization and mass transfer of substrates. Batch experiments revealed that substrate utilization of the coupled sludge granules followed Monod’s kinetic model under hypoxic conditions and at initial substrate concentrations ranging from 1,350 to 4,456 mg/L. The corresponding kinetic coefficients of ks (maximum specific substrate glucose utilization rate), Ks (half saturation coefficient),and Y (growth yield) were 5.6 ~ 7.8/day, 58 ~ 64 mg/L, and 0.11 ~ 0.17 mg of MLSS/mg of COD, respectively. Low dissolved oxygen content suppressed the activity of aerobic enzymes, which resulted in a ks value between those of aerobic granules and anaerobic granules. The maximum oxygen consumption rate (ko = 0.89/day) was relatively higher while the half-saturation constant (Ko = 1.71 mg/L)was significantly lower than those of aerobic granules. These results imply that dissolved oxygen was used more efficiently under hypoxic conditions. Thiele modulus (φ)and effectiveness factor (η) analysis revealed that the activity of microorganisms inside the granules was limited by the availability of oxygen. These properties differed from those found in aerobic granules, anaerobic granules,and activated sludge.
Energy-Efficiency and Transmission Strategy Selection in Cooperative Wireless Sensor Networks
Zhang, Yanbing,Dai, Huaiyu The Korea Institute of Information and Commucation 2007 Journal of communications and networks Vol.9 No.4
Energy efficiency is one of the most critical concerns for wireless sensor networks. By allowing sensor nodes in close proximity to cooperate in transmission to form a virtual multiple-input multiple-output(MIMO) system, recent progress in wireless MIMO communications can be exploited to boost the system throughput, or equivalently reduce the energy consumption for the same throughput and BER target. However, these cooperative transmission strategies may incur additional energy cost and system overhead. In this paper, assuming that data collectors are equipped with antenna arrays and superior processing capability, energy efficiency of relevant traditional and cooperative transmission strategies: Single-input-multiple-output(SIMO), space-time block coding(STBC), and spatial multiplexing(SM) are studied. Analysis in the wideband regime reveals that, while receive diversity introduces significant improvement in both energy efficiency and spectral efficiency, further improvement due to the transmit diversity of STBC is limited, as opposed to the superiority of the SM scheme especially for non-trivial spectral efficiency. These observations are further confirmed in our analysis of more realistic systems with limited bandwidth, finite constellation sizes, and a target error rate. Based on this analysis, general guidelines are presented for optimal transmission strategy selection in system level and link level, aiming at minimum energy consumption while meeting different requirements. The proposed selection rules, especially those based on system-level metrics, are easy to implement for sensor applications. The framework provided here may also be readily extended to other scenarios or applications.