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Chengyu Jin,Lingyun Wang,Xiaoying Liu,Yuanchao Lu,Ningxiang Yu,Xiaohua Nie,Qin Ye,Xianghe Meng 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.14
Gardenia jasminoides Ellis, a representative for “homology of medicine and food”, can be used to produce pigment and edible oil. Here, aqueous enzymatic extraction (AEE) combined with puffing pre-treatment was explored to prepare oil from gardenia seeds. Both wet-heating puffing (WP) at 90 °C and dry-heating puffing (DP) at 1.0 MPa facilitated the release of free oil by AEE, resulting in the highest free oil yields (FOY) of 21.8% and 23.2% within 3 h, much higher than that of un-puffed group. Additionally, active crocin and geniposide were also completely released. The FOY obtained was much higher than mechanical pressing method (10.44%), and close to solvent extraction (25.45%). Microstructure analysis indicated that gardenia seeds expanded by dry-heating puffing (1.0 MPa) had a larger, rougher surface and porous structure than other groups. Overall, AEE coupled with puffing pre-treatment developed is an eco-friendly extraction technology with high efficiency that can be employed to oil preparation.
Design of A Second Harmonic Current Based High Step-down 48V-to-1V Resonant DC-DC Converter
Ziheng Liu,Jinyan Wang,Ju Gao,Jiayin He,Chengyu Huang,Xin Wang,Chen Wang,Bin Zhang,Yandong He,Yong Xie 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This paper presents an isolated DC-DC converter topology with a single ground-switch resonant inverter and a current driven rectifier. The inverter circuit oscillates the input voltage at a fundamental switching frequency and a series resonant tank is used to obtain the second harmonic current for power delivery. The circuit operates features constant current (CC) output, which means that the voltage gain never depends on the switching duty cycle. After the circuit’s main waveforms are analyzed and the key parameters are optimized, a 5MHz prototype featuring 48V-to- 1V transfer and up to 10A output current is verified by simulation with discrete ferrite transformer and GaN power switches.
Longfeng Li,Chengyu Li,Mingzhu Liu,Cheng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.11
The catalytic performance of ceria oxide (CeO2) was greatly influenced by the materials' structure and surface area. In this paper, CeO2 porous nanospheres (PNS) with tunable pore and sphere sizes were synthesized by a solvothermal method using diethylene glycol as reaction media. All the as-synthesized CeO2 PNS presented good adsorption capacity for methyl orange, which makes them potential application in waste water treatment conveniently and economically. The control over the sphere and pore sizes of CeO2 PNS was achieved by regulating the volume of water bubble in the reaction system, which supplied limited room for the assembling of preformed CeO2 small nano-precursors.
Yong Chen,Xi Liu,Chengyue Jiang,Gaojian Liao,Bo Hu 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.6
The dynamic response and damage behavior of aluminum honeycomb sandwich panels (HC/SPs) subjected to hypervelocity impact by volcanic rock projectiles were investigated by hypervelocity impact tests and hydrocode simulations. The experiments were conducted using a two stage light gas gun and the results showed that the failure modes in HC/SPs subjected to hypervelocity impact by volcanic rock projectiles mainly took forms of front-face denting and circular perforation, honeycomb core collapsing and rapture, rear-face petalling and perforation etc. A 3D discrete configuration of the porous volcanic rock projectiles was set up. The hypervelocity impact behavior of the HC/SPs was investigated through hydrocode modeling, within a Lagrange-SPH coupling method in LS-DYNA solver. It was found that the dynamic response and failure modes in the HC/SPs were significantly influenced by the impact location and the impact velocity of the volcanic rock projectile.
Zhaoqin Wang,Xiaorong Wang,Xiaoqin Liu,Yusen Wang,Chengyu Li,Tiesong Lin,Peng He 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.9
Common 3-axis CNC milling machines are generally equipped with 2D tool radius compensation (2D-TRC), which can realize TRC function for the contours in three basic planes when flat end mills are used. The 2D-TRC function makes engineers to program according to the actual contour of a part, and avoids over-cut phenomenon. Unfortunately, the 2D-TRC is unsuitable for ball end mills (BEMs), especially in the situation of milling complex curves or surfaces. In this work, a new TRC named BEM-TRC is used for milling NURBS curve swept surfaces using BEMs based on 3-axis CNC milling machines. In BEM-TRC, the TRC of a BEM involves radial and axial compensation. The cutting point (CP), which is the tangent point between a BEM and a NURBS curve, is considered as a calculation basis point. After obtaining a CP on a NURBS curve using the equi-arc length bisection interpolation method, the cutter center point of a BEM is calculated through off setting the CP the radius ( r ) distance of the BEM along its normal vector. Then the cutter location point of the BEM can be obtained according to the cutter center point. The CNC finishing program corresponding to the cutter location point can be obtained using Matlab software. The simulation based on VERICUT and machining based on a 3-axis milling machine verifies the effectiveness of the BEM-TRC. The over-cut phenomenon is avoided successfully when the BEM-TRC is used.
Jinchao Xu,Dong Wang,Jidan Liu,Chengyue Zhu,Jianhang Bao,Wenshuo Gao,Wei Zhang,Hao Pan 대한척추신경외과학회 2022 Neurospine Vol.19 No.3
Objective: The purpose of this study was to investigate the learning curve and complications of unilateral biportal endoscopy (UBE) in the treatment of lumbar disc herniation (LDH) and lumbar spinal stenosis (LSS). Methods: This was a retrospective cohort analysis of 197 consecutive patients who received UBE unilateral laminotomy bilateral decompression (UBE-ULBD) or lumbar discectomy (UBE-LD) surgery, including 107 males and 90 females with an average age of 64.83 ± 14.29 years. Cumulative sum (CUSUM) and risk-adjusted cumulative sum analysis (RA-CUSUM) were used to evaluate the learning curve, with the occurrence of complications defined as surgical failure, and variables of different phase of the learning curve were compared. Results: The cutoff point of learning curve of UBE surgery was 54 cases according to CUSUM analysis. The learning curve of UBE-ULBD and UBE-LD were divided into 3 phases. The first cutoff points were 31 and 12 cases, and the second cutoff point were 67 and 32 cases respectively. With the progress of the learning curve, the operation time and postoperative hospital stays decreased. The visual analogue scale and Oswestry Disability Index at the last follow-up were significantly lower than that before surgery. The incidence of surgical failure was 6.11% and began to decrease after the 89th case based on RA-CUSUM analysis. The surgical failure rate decreased from 10.11% to 2.78 after the 89th case with significant different. Conclusion: UBE surgery is effective in the treatment of LDH and LSS with low incidence of complications. But a learning curve of at least 54 cases still required for mastering UBE surgery.
Wang, Chaochen,Lee, Ji-Eun,Cho, Young-Wook,Xiao, Ying,Jin, Qihuang,Liu, Chengyu,Ge, Kai Proceedings of the National Academy of Sciences 2012 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.109 No.38
<P>To investigate the role of histone H3K27 demethylase UTX in embryonic stem (ES) cell differentiation, we have generated <I>UTX</I> knockout (KO) and enzyme-dead knock-in male ES cells. Deletion of the X-chromosome-encoded <I>UTX</I> gene in male ES cells markedly decreases expression of the paralogous <I>UTY</I> gene encoded by Y chromosome, but has no effect on global H3K27me3 level, <I>Hox</I> gene expression, or ES cell self-renewal. However, <I>UTX</I> KO cells show severe defects in mesoderm differentiation and induction of <I>Brachyury</I>, a transcription factor essential for mesoderm development. Surprisingly, UTX regulates mesoderm differentiation and <I>Brachyury</I> expression independent of its enzymatic activity. UTY, which lacks detectable demethylase activity, compensates for the loss of UTX in regulating <I>Brachyury</I> expression. UTX and UTY bind directly to <I>Brachyury</I> promoter and are required for Wnt/β-catenin signaling-induced <I>Brachyury</I> expression in ES cells. Interestingly, male <I>UTX</I> KO embryos express normal levels of <I>UTY</I> and survive until birth. In contrast, female <I>UTX</I> KO mice, which lack the <I>UTY</I> gene, show embryonic lethality before embryonic day 11.5. Female <I>UTX</I> KO embryos show severe defects in both <I>Brachyury</I> expression and embryonic development of mesoderm-derived posterior notochord, cardiac, and hematopoietic tissues. These results indicate that UTX controls mesoderm differentiation and <I>Brachyury</I> expression independent of H3K27 demethylase activity, and suggest that UTX and UTY are functionally redundant in ES cell differentiation and early embryonic development.</P>