Li Zhi Wu

Beijing Institute of Petrochemical Technology

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Co-Authors

Ying Hua Ye

Nanjing University of Science and Technology

Rui Shen

Tsinghua University

Jing Hao Ren

Beijing Institute of Petrochemical Technology

Wei Zhang

University of Groningen

Yuan Chao Liu

Guangdong Academy of Sciences

Yan Hu

Shanghai Mental Health Center

Cheng Bo Ru

Nanjing University of Science and Technology

Yi Ru Chen

Jilin University

Peng Zhu

Nanjing University of Science and Technology

Chao Gao

Nanjing University of Science and Technology

Cooperative Institutions

Nanjing University of Science and Technology

Ministry of Industry and Information Technology

Dalian University of Technology

Inner Mongolia Agricultural University

Guangdong University of Technology

Taiyuan University of Technology

Jiangsu University

The Synergetic Innovation Center for Advanced Materials

Beijing Institute of Petrochemical Technology

Dalian Ocean University

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Optimization Decomposition Cast Structure in M35 High-Speed Steel

Advanced materials research (2013)

Peng Han Jian Zhang Li Zhi Wu Xiao Dong You

The effects of the different heat-treatments on the eutectic carbides in HSS cast strip are studied. The microstructure of the high speed steel(HSS) is analysized by means of optical microscopy and SEM. The results show that the heat treatment can make M2C and M6C metastable phase decompose. After comparison we can find that the optimized heat treatment processing of HSS cast strip is at 1200°Cfor 6 h, under which the fine and uniform carbides can be obtained.

High Speed Steel

Metastability

10.4028/www.scientific.net/amr.706-708.167

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Design of Permanent Magnet Synchronous Motor Control Chip Based on SOPC

Applied Mechanics and Materials (2014)

Peng Fei Chen Yue Zeng Zu Qun Peng Li Zhi Wu

This article presents a program for permanent magnet synchronous motor (PMSM) vector control chip design based on SOPC technology. Microprocessor NIOSII and hardware arithmetic unit such as CORDIC and SVPWM, were all integrated in a FPGA by using bus interconnect and IP reuse technology, so that became a dedicated control chip of PMSM. Using hardware and software co-design methods, the chip was designed on Altera's CycloneIII FPGA, chip design flexibility and use small resource. Finally, combined with the power driver board achieved the dual closed-loop control of PMSM. The results show that system have a good performance, which proved that system can be well controlled by the designed IC.

Nios II

Microprocessor

Control unit

10.4028/www.scientific.net/amm.654.203

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Research of the Reactivity Photoacoustic Characteristics of PETN and HNS Induced by Laser

Applied Mechanics and Materials (2013)

Hui E Wang Wei Zhang Rui Shen Ying Hua Ye Li Zhi Wu

The reactivity photoacoustic technology was used to detect the laser induced photoacoustic spectroscopy characteristics of explosives (PETN and HNS). The results showed that: the reflectivity of pure PETN and HNS under laser irradiation was large and the photoacoustic signal was weak. After doping with carbon nanotubes (CNTs) and carbon black (CB), the reflectivity decreased. The photothermal conversion and the optical absorption coefficient rate increased and the photoacoustic signal enhanced. For the same sample, the intensity of the signal was proportional to the incident laser energy. For the same explosives and under the same doping amount, the photoacoustic signal of the CNTs doped sample is greater than that of the CB doped sample. For the same sample and the same dopant, the greater the amount of doping, the stronger the photoacoustic signal. There was optimum ignition energy. By using TG-DSC technology for thermal analysis of the samples, the results from the thermal analysis could explain the reactivity photoacoustic experiment.

Photoacoustic Spectroscopy

Photoacoustic effect

SIGNAL (programming language)

Reactivity

10.4028/www.scientific.net/amm.423-426.479

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Experimental Analysis of the Long Carbon Nanotubes Formation from Controllable Flame

Advanced materials research (2014)

Yuan Chao Liu Li Zhi Wu Jing Hao Ren

Flame method is a new and simple method which may has the possibility of large-scale mass production for the synthesis of carbon nanotubes. It needs not the vacuum environment and carbon nanotubes can be captured at the normal atmospheric pressure. Synthesis of carbon nanotubes from the controllable flame is a new method. It can effectively avoid the defect of the traditional flame method. Experimental apparatus is mainly including controllable flame burner with its ancillary equipment, measuring instrument and catalyst preparation system, etc. The process of formation and growth for carbon nanotube is very complicated on account of the complexity of combustion and chemical reaction. It can be supposed that the formation and growth of carbon nanotubes from the controllable flame involves two steps in general.

Carbon fibers

10.4028/www.scientific.net/amr.1048.383

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The Orthogonal Test Design and Analysis for High Additive Fly Ash Firebrick

Applied Mechanics and Materials (2012)

Shao Xia Gao Bao Chu Yu Chao Gao Li Zhi Wu

In order to arrange the limited test for considering the influence of high additive fly ash firebrick to different element comprehensively and effectively, the authors arrange the orthogonal test and put forward the best proportion scheme and propose industrial production properly through the systematic analysis of the test results.

10.4028/www.scientific.net/amm.174-177.318

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Citations (1)

Laser-Controlled Combustion of Solid Propellant

Advanced materials research (2014)

Qin Zhao Jiang Wu Rui Shen Ying Hua Ye Li Zhi Wu

This paper describes experimental work on laser-controlled combustion of solid propellants. Combustion of AP/HTPB, including ignition, combustion, extinction and re-ignition could be controlled by CO 2 laser irradiation at the back pressure of 0.1, 0.3 and 0.5 MPa in nitrogen. Burning rate of propellant increased linearly with the increasing of laser power density. Vieilles law was used here to check pressure effect to burning rate, pressure exponent under different power density (except 0.5 MW/m 2 ) are very close to 0.17.

Burn rate (chemistry)

Extinction (optical mineralogy)

Power density

10.4028/www.scientific.net/amr.884-885.87

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Citations (5)

Preparation and Characterization of Carbon Nanofibers from the High Temperature Controllable Flame

Advanced materials research (2014)

Yuan Chao Liu Li Zhi Wu Jing Hao Ren

Carbon nanofiber is a new type of carbon materials and it has wide application prospects. At present, there are many kinds of synthesis methods of carbon nanofibers. Among them, preparation of carbon nanofibers from the controllable flame is a new method. It needs simple laboratory equipments and normal atmosphere pressure in this method. Experimental apparatus is including controllable flame burner, thermocouple, mass flow meter and catalyst preparation system, etc. The key factors of synthesis experiment involving the carbon source, the catalyst and high temperature heat source. Characterization of the carbon nanofibers from the controllable flame is by scanning electron microscope (SEM) and transmission electron microscope (TEM).The experimental results indicated that carbon nanofibers with less impurity can be captured at the temperature from 720 to 880 ̊C when carbon monoxide and iron-based catalyst served as carbon source and the catalyst respectively.

Carbon fibers

Thermocouple

Characterization

10.4028/www.scientific.net/amr.1033-1034.1086

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Design and Fabrication of MEMS-Based Solid Propellant Microthrusters Array

Applied Mechanics and Materials (2014)

Cheng Bo Ru Ying Hua Ye Cheng Ling Wang Peng Zhu Rui Shen

A solid propellant microthruster array consists of three parts (five layers) was designed to form propulsion system of nanosatellite. The layers of the array were fabricated by different MEMS technique respectively. Then the array was assembled by adhesive bonding (H70E thermal epoxy). An initial test was operated with the ignition test stand composed of high speed video system, electronic power source, and oscilloscope. A constant voltage was applied to the igniters through two probes contact with the pad of ignition circuitry. The test indicates that the microthruster array can be ignited under 15V.

10.4028/www.scientific.net/amm.490-491.1042

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Citations (13)

Reaction Mechanism of B/KNO<sub>3</sub> under Laser Irradiation

Advanced materials research (2012)

Wei Zhang Rui Shen Li Zhi Wu Yi Ru Chen Ying Hua Ye

The photodissociation of B/KNO 3 (40:60, wt %) mixture, following 532nm laser excitation was investigated by echelle-type spectrometer and time of flight mass spectrometer (TOFMS). The ablation products contained a lot of ions and molecular fraction. Emission spectra and mass spectra of the intermediate products were obtained. According to the possible distribution of the products, multistep reaction mechanism of B/KNO 3 is proposed.

Laser Ablation

Mass fraction

Fraction (chemistry)

10.4028/www.scientific.net/amr.554-556.457

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Citations (1)

Engineering Simulation on Forest Carbon Balance under Different Tree Configuration Mode

Applied Mechanics and Materials (2013)

Yue Guo Li Zhi Wu Yao Yun Fu Cang Qin Qi Wei

From a greenhouse gas policy standpoint, forests play an extremely important role in the exchange of carbon dioxide between the land and atmosphere. Because forest management has a potentially large effect on the entire forest carbon (C) cycle, and the biological and industrial systems are tightly coupled in the North region of China, simulation of varying management and forest product production scenarios are needed to explore trade-offs of managing forests for multiple objectives. Thus, an important consideration in management of forests is their present and future capacity to sequester C from the atmosphere. In this paper, C balance of the biological system was simulated under different management scenarios that were designed to test effects of plant configuration.

Mode (computer interface)

10.4028/www.scientific.net/amm.295-298.2324

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