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Experimental study on a new type of assembly bolted end-plate connection
Shufeng Li,Qingning Li,Haotian Jiang,Hao Zhang,Lei Yan,Weishan Jiang 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.26 No.4
The bolted end-plate beam-column connections have been widely used in steel structure and composite structure because of its excellent seismic performance. In this paper, the end-plate bolted connection is applied in the concrete structure, A new-type of fabricated beam-column connections with end-plates is presented, and steel plate hoop is used to replace stirrups in the node core area. To study the seismic behavior of the joint, seven specimens are tested by pseudo-static test. The experimental results show that the new type of assembly node has good ductility and energy dissipation capacity. Besides, under the restraint effect of the high-strength stirrup, the width of the web crack is effectively controlled. In addition, based on the analysis of the factors affecting the shear capacity of the node core area, the formula of shear capacity of the core area of the node is proposed, and the theoretical values of the formula are consistent with the experimental value.
Shufeng Zhou,Yihuai Gao,Wenbo Tang,Xihu Dai,He Gao,Guoliang Chen,Jinxian Ye,Eli Chan,Hwee Lling Koh,Xiaotian Li 한국식품영양과학회 2005 Journal of medicinal food Vol.8 No.2
Preclinical studies have established that the polysaccharide fractions of Ganoderma lucidumhave potential an-titumor activity. Recent clinical studies have demonstrated that G. lucidumpolysaccharides enhance host immune functions[e.g., enhanced natural killer (NK) cell activity] in patients with advanced solid tumors, although an objective response wasnot observed. This open-label study aimed to evaluate the effects of water-soluble G. lucidumpolysaccharides (Ganopoly??,Encore International Corp., Auckland, New Zealand) on immune functions in patients with advanced lung cancer. Thirty-sixpatients were enrolled and treated with 5.4 g/day Ganopoly for 12 weeks. In the 30 cancer patients who completed the trial,treatment with Ganopoly did not significantly alter the mean mitogenic reactivity to phytohemagglutinin, mean counts of CD3,CD4, CD8, and CD56, mean plasma concentrations of interleukin (IL)-2, IL-6, and interferon (IFN)-., or NK activity in thepatients, but the results were significantly variable. However, some cancer patients demonstrated markedly modulated im-mune functions. The changes in IL-1 were correlated with those for IL-6, IFN-., CD3, CD8, and NK activity (P. .05), andIL-2 changes were correlated with those for IL-6, CD8, and NK activity. The results suggest that subgroups of cancer patientsmight be responsive to Ganopoly in combination with chemotherapy/radiotherapy. Further studies are needed to explore theefficacy and safety of Ganopoly used alone or in combination with chemotherapy/radiotherapy in lung cancer patients.
A comparative study of low-complexity MMSE signal detection for massive MIMO systems
( Shufeng Zhao ),( Bin Shen ),( Quan Hua ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.4
For uplink multi-user massive MIMO systems, conventional minimum mean square error (MMSE) linear detection method achieves near-optimal performance when the number of antennas at base station is much larger than that of the single-antenna users. However, MMSE detection involves complicated matrix inversion, thus making it cumbersome to be implemented cost-effectively and rapidly. In this paper, we first summarize in detail the state-of-the-art simplified MMSE detection algorithms that circumvent the complicated matrix inversion and hence reduce the computation complexity from □(K<sup>3</sup>) to □(K<sup>2</sup>) or □(NK) with some certain performance sacrifice. Meanwhile, we divide the simplified algorithms into two categories, namely the matrix inversion approximation and the classical iterative linear equation solving methods, and make comparisons between them in terms of detection performance and computation complexity. In order to further optimize the detection performance of the existing detection algorithms, we propose more proper solutions to set the initial values and relaxation parameters, and present a new way of reconstructing the exact effective noise variance to accelerate the convergence speed. Analysis and simulation results verify that with the help of proper initial values and parameters, the simplified matrix inversion based detection algorithms can achieve detection performance quite close to that of the ideal matrix inversion based MMSE algorithm with only a small number of series expansions or iterations.
Shufeng Fan,Long Yi Jin,Zhuoshi Wang,Chengfan Li,Yongri Liang,Tie Chen 한국고분자학회 2015 Macromolecular Research Vol.23 No.10
Triblock coil-rod-coil compounds, consisting of four biphenyls and a p-terphenyl unit linked together with ether bonds as a rod segment, incorporating lateral methyl or ethoxymethyl groups at 2 and 5 positions of the benzene ring of p-terphenyl and poly(ethylene oxide) (PEO) with a degree of polymerization of 7, 12, 17, incorporating lateral methyl groups between the rod and coil segment as the coil segments, were synthesized. The compound structures were characterized with 1H NMR and matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectroscopy. The self-assembling behavior of the compounds is investigated by means of differential scanning calorimetry (DSC), small-angle X-ray scattering (SAXS), and optical polarized micrograph (POM) in the bulk state. These compounds spontaneously self-assemble into lamellar, hexagonal perforated lamellar, rectangular columnar, and oblique columnar structures in the crystalline phase, and hexagonal perforated lamellar, bicontinuous cubic, and oblique columnar structures in the liquid crystalline phase, respectively. The results revealed that the lateral methyl groups attached to the interface of rod and coil segments strongly induce the compounds to self-assemble into various supramolecular nanostructures in the crystalline phase and the liquid crystalline mesophase.
Mechanical characteristics and experimental research of a flexible rope-sheave hoisting mechanism
Shufeng Tang,Renjie Huang,Guoqing Zhao 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.7
Owing to such advantages as long transmission distances and compact structures, flexible rope-sheave lifting mechanisms are important for applications in disaster relief, emergency treatment, high-altitude operations, and robot transmission. Despite their long research history and wide range of applications, the mechanical properties of the interactions between flexible ropes and sheaves have been investigated by few studies, most of which rely on experience and experimental test results for design. The present study developed a mathematical model for the mechanical characteristics of a hoisting mechanism that was composed of a sheave with gear teeth, pressure wheels, and a flexible rope. The critical value for the hoisting mechanism’s slippage was analyzed, and the parameters that affected the lifting performance, such as the sheave groove angle and gear teeth, were simulated and optimized. The results were consistent with the experimental test data. The optimized rope-sheave lifting mechanism was further applied to the design and development of rope-climbing robots, and its lifting performance was experimentally tested. The research results presented in this paper described the mechanical characteristics of the flexible rope-sheave lifting mechanism, combined the mechanical model with the optimized design, and verified them through experiments;this provided guidance for more precise and quantitative applications of flexible rope-sheaves.
Ganoderma lucidum Polysaccharide Fractions Accelerate Healing of Acetic Acid-Induced Ulcers in Rats
Shufeng Zhou,Wenbo Tang,He Gao,Eli Chan,Jin Lan,Yihuai Gao 한국식품영양과학회 2004 Journal of medicinal food Vol.7 No.4
The polysaccharide (PS) fractions from several medicinal herbs have been reported to have antiulcer effects against experimental ulcer in the rat. The watersoluble PS fractions from G. lucidum (Reishi mushroom) have been shown to inhibit indomethacin-induced gastric mucosal lesions in rats. This study aimed to investigate the effect of the PS fraction from G. lucidum on the healing of gastric ulcer induced by acetic acid in the rat and to elucidate the underlying mechanisms involved. The abdomen of rats was incised and the stomach treated with 10 M acetic acid (100 l) for 1 min, and then treated with G. lucidum PS (0.1, 0.5 or 1.0 g/kg) intragastrically, once a day for 14 consecutive days. The results indicated that the oral administration of G. lucidum PS at 0.5 and 1.0 g/kg for 2 weeks caused a significant acceleration of the ulcer healing by 40.1% and 55.9%, respectively. In the mechanistic studies, additional rats were treated with 10 M acetic acid to induce acute ulcers, and then treated with G. lucidum PS (1.0 g/kg) for 3, 7, 10 or 14 days. Exposure of the rat stomach to acetic acid led to decreased mucus and increased prostaglandin levels. Treatment of G. lucidum PS at 1.0 g/kg significantly (P < 0.05) suppressed or restored the decreased gastric mucus levels and increased gastric prostaglandin concentrations compared to the control group. These results indicates that G. lucidum PS is an active component with healing efficacy on acetic acid-induced ulcer in the rat, which may represent a useful herbal preparation for the prevention and treatment of peptic ulcers.