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Optimization Study on Bias Angle of a Swirl Burner with Tangential Inlet Air
LV Ziqiang,Lius Guangqiang,Liu Yingjie 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.3
In this paper numerical simulation and experimental study was carried out for a tangential inlet air swirl burner which is used for high heat value biomass gas. Study on the different inlet angle effects on Combustion by numerical method. The results of the study show that the 30 degree is the best. The intake angle burner 30 degrees were tested to verify the accuracy of simulation results. Through the comparative analysis of the trajectory and the velocity of the air, the method and the conclusion of the simulation study are reliable.
Study on Emporium Airflow Optimization in View of Cooling Load Distribution Indoor
LV Ziqiang,Liu Yingjie 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1
Large load and high energy consumption is the characteristics of air-conditioning in shopping malls. For most of these shopping malls which are in excessively high energy consumption were accompanied by unreasonable airflow forms. This work measured the lighting and body cooling load at three shopping malls, analyzed lighting and body cooling load on the different floors ,different lighting area, then compared the measured value and the design manual recommended values, According to the results of analysis, recommended values is wrong. A personalized airflow forms is proposed according to the actual personnel distribution of the shopping mall; the plan of ceiling exhaust is proposed according lighting heat dissipation, the ventilation efficiency of air conditioning systems proved be significantly increased after the improvements of airflow form, it provide an effective reference to design air conditioning system for these types of shopping malls.
A 2-40 Gb/s PAM4/NRZ Dual-mode Wireline Transmitter with 4:1 MUX in 65-nm CMOS
Fangxu Lv,Xuqiang Zheng,Feng Zhao,Jianye Wang,Ziqiang Wang,Shuai Yuan,Yajun He,Chun Zhang,Zhihua Wang 대한전자공학회 2018 Journal of semiconductor technology and science Vol.18 No.2
This paper presents a 2-40 Gb/s dual-mode wireline transmitter supporting the four-level pulse amplitude modulation (PAM4) and non-return-tozero (NRZ) modulation with a multiplexer (MUX)-based two-tap feed-forward equalizer (FFE). An edgeacceleration technique is proposed for the 4:1 MUX to increase the bandwidth. By utilizing a dedicated cascode current source, the output swing can achieve 900 mV with a level deviation of only 0.12% for PAM4. Fabricated in a 65-nm CMOS process, the transmitter consumes 117 mW and 89 mW at 40 Gb/s in PAM4 and NRZ at 1.2 V supply.
CFD/CSD Approach to Evaluate the Aeroelastic Response of Hypersonic Vehicle Wing
Jinan Lv,Li Guo,Jian Sun,Ziqiang Liu 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
A coupling numerical simulation technology which combined computational fluid dynamics (CFD) method with computational structure dynamic (CSD) is developed. Several kinds of mode to exchange data for CFD/CSD coupled computation is designed. In this paper, aeroelastic response of hypersonic wing under Ma 5 wind tunnel experimental condition is calculated and compared with piston theory method as an example. The influence of coupling mode is discussed. The computed result indicates CDF/CSD method of aeroelastic simulation on the threedimensional wing is feasible and credible.
Hypersonic thin plate flutter problem prediction using CFD-CSD approach
Jinan Lv,Zhichao Fu,Feng Feng,Ziqiang Liu 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.10
Hypersonic low-aspect-ratio thin plate flutter problem should be considered as a special aeroelastic case. In this paper, the flutter problem of a hypersonic thin elastic plate under Ma 6 flight condition is analyzed using CFD/CSD approach. The computed results indicate that in this case the coupling time step size should be considered cautiously but dual-time stepping and viscosity effect appears to be not significant for aeroelastic response of the thin plate.
Yunyun Wei,Jianfeng Qiu,Ziqiang Han,Xuanyi Wang,Hui Zhang,Xinya Hou,Xiangwei Lv,Xiaolong Mao 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00
Background For some ICU patients, an artificial airway must be established with an endotracheal tube, but Candida albicans can easily adhere to the tube surface and form a biofilm, leading to potentially life threatening fungal infections. Therefore, it is urgent to prevent and reduce C. albicans infections introduced by the endotracheal tube. However, there are few antifungal drugs effective against C. albicans, and each of these drugs may have adverse effects on human cells. Saccharomyces boulardii is regarded as an alternative strategy to inhibit the adhesion of C. albicans, but it is affected by environmental stress. We hypothesized that it is feasible to strengthen the antagonistic ability of S. boulardii via encapsulating and genetically modification. Methods In this study, a bioactive material carrying the overexpressed MCP1 gene of Saccharomyces boulardii was constructed based on one-step photo-crosslinking. This material achieved spatial growth control of S. boulardii by encapsulating each S. boulardii cell within a hydrogel pore. The bioactive material was coated on an endotracheal tube and tested for its ability to inhibit the adhesion of C. albicans. Additionally, the material’s antagonistic activity towards C. albicans was evaluated by detecting intracellular Adenosine-triphosphate content, reactive oxygen species level and the activity of antioxidative enzymes. Tissue invasion experiment was executed to further evaluate the antiadhesion ability of S. boulardii bio-coating. Results Encapsulating the overexpression of MCP1 by S. boulardii in hydrogel pores enhanced the viability of probiotics in the presence of high salt and oxidation stress. When used as the coating of an endotracheal tube, the S. boulardii bioactive material efficiently inhibited the adhesion of C. albicans by impairing the activities of superoxide dismutase and catalase and disturbing mitochondrial functions. In vivo, the S. boulardii bioactive material coating displayed good biocompatibility and reduced the host tissue invasion and virulence of C. albicans. Conclusions The integration of genetic modification and immobilization model breaks the bottleneck of previous application of microorganisms, and provides a new way to prevent fungal infections introduced by endotracheal tubes.