Comparison of Acupuncturing Hegu (LI4) by Metal or Laser Needle on Facial Blood Perfusion Using Laser Speckle Technique

Yuying Tian,Tao Huang,Gerhard Litscher,Lu Wang,Guangjun Wang,Shuyong Jia,Yuqing Zhang,Weibo Zhang 사단법인약침학회 2011 Journal of Acupuncture & Meridian Studies Vol.4 No.3

Aim: To compare the difference of remote effects of acupuncture between metal needle and laser needle on facial blood perfusion (FBP). Methods: Hand acupuncture and laser-needle acupuncture were randomly used on Hegu (LI4)in 20 healthy volunteers. FBP was observed by speckle contrast imager before, during, and after the acupunctures. Results: For hand acupuncture there were gradual increases on the nose and left and right visor areas (p < 0.05 or p < 0.01) during the acupuncture and on an immediate increase (p < 0.01) that remained constant during the acupuncture on the forehead area but no significant increase on mouth area. During laser-needle acupuncture, on the other hand, there was a tendency of increase on the nose, left visor, and right visor areas but these were non significant. Conclusion: Hand acupuncture can influence FBP in remote places connected by meridians.

A Simple Intermediate Approach of Sputter Deposition at Room Temperature for Improving the Stability of a-InGaZnO Thin Film Transistors

Chunlan Wang,Yebo Jin,Yuqing Li,Gangying Guo,Yongle Song,Hao Huang,Aolin Wang,Han He 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.4

Amorphous InGaZnO (a-InGaZnO) thin film transistors (TFTs) with stability and low-temperature deposition are importantchallenges for their application in flexible electronics. Herein, a-InGaZnO films were successfully obtained throughout thewhole process in the room-temperature sputtering system. An intermediate nitrogen treatment a-InGaZnO film link contributedto high performance a-InGaZnO TFTs. The current switching ratio of the optimal nitrogen treatment transistor is closeto 107,the field-effect mobility (μFE) is 11.7 cm2/Vs and threshold voltage (VTH) is − 0.12 V, respectively. And the 4-daythreshold voltage offset (ΔVTH) is reduced from 12.98 to 4.92 V. The improved electrical properties may be attributed to thereduction of defect concentration and average interfacial trap density due to nitrogen occupation of oxygen vacancies (VO).

The Effect of Electronic Characteristics of Molecules in Ester Insulating Oils on Streamer Propagation

Wenxiong Mo,Haoyong Song,Qingdan Huang,Yuqing Chen,Wei Wang 한국전기전자재료학회 2022 Transactions on Electrical and Electronic Material Vol.23 No.6

Ester insulating oils are the preferred dielectric fluids of choice for oil-immersed transformers because of their superior fire safety, environmental friendliness, sustainability, and satisfying operating efficiency compared with traditional mineral insulating oil. However, the ease of streamer propagation and low breakdown voltage in ester fluids at positive lightning impulse (LI) voltage pose a crucial challenge to the safe operation of transformers, signifi cantly limiting their use in power transformers. Currently, most available studies have focused on the morphological analysis of streamers without further investigation at the molecule level. In this work, we investigated the effect of ionization potential (IP) and electron affinity (EA) of molecules in three types of ester fl uids-palm fatty acid ester (PFAE), soybean (FR3) and rapeseed (RDB) insulating oils-on streamer propagation at positive LI voltage. The calculated IP of PFAE oil (8.8 eV) is higher than the other two oils (7.5 eV). 66% faster streamer propagation and 25% lower positive LI breakdown voltage were found in PFAE oil compared with FR3 and RDB oils under positive LI voltage. Under the same applied voltage, the streamer in PFAE oil travelled faster and stopped at a farther distance than in FR3 and RDB oils. The lower EA and viscosity of PFAE oil equipped electrons with higher kinetic energy, leading to a fiercer collision between electrons and molecules and thus a large number of excited molecules. In contrast, relatively higher EAs and viscosities of FR3 and RDB oils limited electron-molecule collision, resulting in a lack of excited molecules for streamer propagation.

Characterization of tunnel oxide passivated contact with n-type poly-Si on ptype c-Si wafer substrate

Xueqi Guo,Yuheng Zeng,Zhi Zhang,Yuqing Huang,Mingdun Liao,Qing Yang,Zhixue Wang,Minyong Du,Denggao Guan,Baojie Yan,Jichun Ye 한국물리학회 2019 Current Applied Physics Vol.19 No.7

The junction properties of tunnel silicon oxide (SiOx) passivated contact (TOPCon) with n-type poly-Si on p-type c-Si wafer are characterized using current-voltage (J-V) and capacitance-voltage (C-V) measurements. The dark J-V curves show a standard diode characteristic with a turn-on voltage of ∼0.63 V, indicating a p-n junction is formed. While the C-V curve displays an irregular shape with features of 1) a slow C increase with the decrease of the magnitude of reverse bias voltage, being used to estimate the built-in potential (Vbi), 2) a significant increase at a given positive bias voltage, corresponding to the geometric capacitance crossing the ultrathin SiOx, and 3) a sharp decrease to negative values, resulting from the charge tunneling through the SiOx layer. The C of depleting layer deviates from the normal linear curve in the 1/C2-V plot, which is caused by the diffusion of P dopants from the n-type poly-Si into the p-type c-Si wafer as confirmed by the electrochemical capacitance-voltage measurements. However, the 1/C2+γ-V plots with γ > 0 leads to linear curves with a proper γ and the Vbi can still be estimated. We find that the Vbi is the range of 0.75–0.85 V, increases with the increase of the doping ratio during the poly-Si fabrication process, and correlates with the passivation quality as measured by the reverse saturated current and implied open circuit voltage extracted from transient photoconductivity decay.

Differences in Characteristics of Long-Gap Lightning Impulse Breakdown between Vegetable and Mineral Insulating Oil

Wenxiong Mo,Haoyong Song,Qingdan Huang,Yuqing Chen,Wei Wang 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.3

Vegetable insulating oils, with higher fire point, lower biological hazard and better availability compared to traditional mineral insulating oils, have enormous potential to become the substitute of the latter, given the trend of green development of the power equipment, for example, the transformers. However, the obviously different constitution of the vegetable oils makes the circumstance hard when considering their application on the insulation for actual transformers. One of the significant deficiencies of the vegetable oils in working condition is their insufficient lightning impulse endurance under partial high electric fields and large discharge gaps. In this article, three kinds of transformer insulating oils, rapeseed oil, FR3 and 25# mineral oil were chosen to investigate the performances of these insulation materials under long-gap lightning impulses with positive and negative polarity respectively. The variation rules of breakdown voltage and velocity with the gap length were obtained. And the difference of the lightning impulse voltage endurance between the vegetable and mineral insulating oils as well as its causes based on theories of streamer and ionization potential (IP) were analyzed, which led to the conclusion that the gap increase causes more threat to the positive lightning impulse breakdown of vegetable insulating oils, compared to its counterpart.

LncRNA H19 Drives Proliferation of Cardiac Fibroblasts and Collagen Production via Suppression of the miR-29a-3p/miR-29b-3p-VEGFA/TGF-β Axis

Feng Guo,Chengchun Tang,Bo Huang,Lifei Gu,Jun Zhou,Zongyang Mo,Chang Liu,Yuqing Liu 한국분자세포생물학회 2022 Molecules and cells Vol.45 No.3

The aim of this study was to investigating whether lncRNA H19 promotes myocardial fibrosis by suppressing the miR-29a-3p/miR-29b-3p-VEGFA/TGF-β axis. Patients with atrial fibrillation (AF) and healthy volunteers were included in the study, and their biochemical parameters were collected. In addition, pcDNA3.1-H19, si-H19, and miR-29a/b-3p mimic/inhibitor were transfected into cardiac fibroblasts (CFs), and proliferation of CFs was detected by MTT assay. Expression of H19 and miR-29a/b-3p were detected using real-time quantitative polymerase chain reaction, and expression of α-smooth muscle actin (α-SMA), collagen I, collagen II, matrix metalloproteinase-2 (MMP-2), and elastin were measured by western blot analysis. The dual luciferase reporter gene assay was carried out to detect the sponging relationship between H19 and miR-29a/b-3p in CFs. Compared with healthy volunteers, the level of plasma H19 was significantly elevated in patients with AF, while miR-29a-3p and miR-29b-3p were markedly depressed (P < 0.05). Serum expression of lncRNA H19 was negatively correlated with the expression of miR-29a-3p and miR-29b-3p among patients with AF (rs = –0.337, rs = –0.236). Moreover, up-regulation of H19 expression and down-regulation of miR-29a/b-3p expression facilitated proliferation and synthesis of extracellular matrix (ECM)-related proteins. SB431542 and si-VEGFA are able to reverse the promotion of miR-29a/b-3p on proliferation of CFs and ECM-related protein synthesis. The findings of the present study suggest that H19 promoted CF proliferation and collagen synthesis by suppressing the miR-29a-3p/miR-29b-3p-VEGFA/TGF-β axis, and provide support for a potential new direction for the treatment of AF.