Anti-Rollover Control Based on Stable Zone Partition of Counterbalanced Forklift Trucks

Xia Guang,Xia Yan,Tang Xiwen,Zhao Linfeng,Hu Jinfang 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.6

To improve the anti-rollover capacity of a counterbalanced forklift, a two-stage rollover dynamic model is established on the basis of the forklift structure. Stable zones are divided according to the two-stage lateral load transfer rate: stable region, relatively stable region, dangerous zone and abnormal dangerous zone. An anti-rollover layered control strategy based on stable zone partition is proposed, and different anti-rollover control actuators are selected: dynamic balance weight, anti-rollover cylinder and steering cylinder. Anti-rollover controllers consist of the upper stable region identification controller, the middle-level controller based on model predictive control (MPC) and the lower layer executive controller. The upper stable region identification controller performs stable zone recognition based on the two-stage lateral load transfer rate. The middlelevel MPC controller calculates the required control torque with the body’s lateral angle and yaw rate as the control objectives. The lower layer executive controller controls the balance weight, anti-rollover cylinder and the steering cylinder according to the improved chain incremental allocation method to meet the target control torque. Simulation and real vehicle tests based on MATLAB/Simulink show that the anti-rollover control based on stable zone partition can greatly reduce the risk of forklift rollover and improve the forklift safety.

Preparation and Physicochemical Characterizations of Tanshinone IIA Solid Dispersion

Xia Zhao,Xin Liu,Lishe Gan,JianXia Mo 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.6

This investigation describes a novel approach to prepare solid dispersions of tanshinone IIA using a laboratory-scale planetary ball mill. Poloxamer 188 was employed as the surfactant carrier to improve the solubility and dissolution of the poorly soluble drug, tanshinone IIA. Solubility and dissolution were evaluated compared to the corresponding physical mixtures and pure drug. Furthermore, the physicochemical properties of the solid dispersions were investigated using scanning electron microscopy, powder X-ray diffraction, differential scanning calorimetry, Fourier transform infrared spectroscopy and ultraviolet spectrophotometry. The solid dispersion significantly enhanced drug solubility and dissolution compared with pure drug and the physical mixtures. Scanning electron microscopy, powder X-ray diffraction,differential scanning calorimetry and Fourier transform infrared spectroscopy analyses of tanshinone IIA/poloxamer 188 system confirmed that there were intermolecular interactions between tanshinone IIA and poloxamer 188 and no conversion to crystalline material. Tanshinone IIA existed in a microcrystalline form in the system. These results suggested that improvement of the dissolution rate could be correlated to the formation of a eutectic mixture between the drug and the carrier. After 60 days the solid dispersion samples were chemically and physically stable. The present studies indicated that the planetary ball mill technique could be considered as a novel and efficient method to prepare solid dispersion formulations.

The hierarchical microstructure of helical polyacetylene nanofiber

Zhao Xia Jin,Zhi Yong Wang,Zu Jin Shi,Hyun Jung Lee,Yung Woo Park,Kazuo Akagi 한국물리학회 2007 Current Applied Physics Vol.7 No.4

The microstructure of helical polyacetylene nanofiber was studied by HRTEM. A hierarchical self-organized microstructure in nanometer scales was observed firstly.

Geographic Distribution and Epidemiology of Lung Cancer During 2011 in Zhejiang Province of China

Lin, Xia-Lu,Chen, Yan,Gong, Wei-Wei,Wu, Zhao-Fan,Zou, Bao-Bo,Zhao, Jin-Shun,Gu, Hua,Jiang, Jian-Min Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.13

Background: To explore etiology for providing scientific clues for the prevention of lung cancer. Materials and Methods: Data for lung cancer incidence and meteorological geographic factors from 25 counties in Zhejiang province of China during 2011 were studied. Stepwise multiple regression and correlation analysis were performed to analyze the geographic distribution and epidemiology of lung cancer. Results: 8,291 new cases (5,998 in males and 2,293 females) of lung cancer during 2011 in Zhejiang province were reported in the 25 studied counties. Reported and standardized incidence rates for lung cancer were 58.0 and 47.0 per 100,000 population, respectively. The incidence of lung cancer increased with age. Geographic distribution analysis shows that the standardized incidence rates of lung cancer in northeastern Zhejiang province were higher than in the southwestern part, such as in Nanhu, Fuyang, Wuxing and Yuyao counties, where the rates were more than 50 per 100,000 population. In the southwestern Zhejiang province, for instance, in Yueqing, Xianju and Jiande counties, the standardized incidence rates of lung cancer were lower than 37 per 100,000 population. Spearman correlation tests showed that forest coverage rate, air quality index (AQI), and annual precipitation level are associated with the incidence of lung cancer. Conclusions: Lung cancer in Zhejiang province shows obvious regional differences. High incidence appears associated with low forest coverage rate, poor air quality and low annual precipitation. Therefore, increasing the forest coverage rate and controlling air pollution may play an important role in lung cancer prevention.

The Direct Feedback Control and Exponential Stabilization of a Coupled Heat PDE-ODE System with Dirichlet Boundary Interconnection

Dong-Xia Zhao,Jun-Min Wang,Ya-Ping Guo 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1

This paper addresses the exponential stability for an interconnected system of an nth-order ODE systemwith the input governed by the Dirichlet boundary of a heat equation, and conversely, the output of the ODE isfluxed into the heat equation. The semigroup approach is adopted to show that the system operator is well-posed. We establish the exponential stability of the system by Riesz basis method. Furthermore, with MATLAB software,some numerical simulations are presented to show the effectiveness of the interconnection between the heat PDEand ODE systems.

Mode-dependent H∞ Filtering for Time-varying Delays Neutral Jump Systems Based on FWM Technique

Guowei Zhao,Guangming Zhuang,Jianwei Xia,Wei Sun,Junsheng Zhao,Minsong Zhang 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.6

This paper is concerned with the problem of mode dependent H∞ filter for uncertainty Markovian jump system with neutral delay and retarded time-varying delay. By using free weight matrix (FWM) technique, the stability conditions of delay dependent are obtained under the framework of Lyapunov stability theory. Based on those result, the delay dependent conditions for full order and mode dependent Markovian jump linear filters are gained, which are expressed by Linear matrix inequalities (LMIs). Finally, a numerical example and a PEEC practical example are employed to prove the validity of the results.

The Spectral Analysis and Exponential Stability of a 1-d 2x2 Hyperbolic System with Proportional Feedback Control

Dong-xia Zhao,Dong-xia Fan,Ya-ping Guo 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.8

In this paper, the well-posedness and stability of a 1-d 2×2 hyperbolic system under proportional feedback control is addressed. The semigroup approach and norm equivalence theorem is adopted to obtain the explicit dissipative condition for control parameters. The asymptotic spectral analysis of the system is presented. It is shown that the real part of the eigenvalues goes to some negative constant as the modulus of eigenvalues goes to +∞. Moreover, we find that there is a group of generalized eigenfunctions which forms a Riesz basis of the Hilbert state space. Hence, the spectrum determined growth condition holds, and then the exponential stability is established.

Surface Modification of Poly(vinylidene fluoride) Ultrafiltration Membranes with Chitosan for Anti-Fouling and Antibacterial Performance

Weiwei Xia,Manman Xie,Xia Feng,Li Chen,Yiping Zhao 한국고분자학회 2018 Macromolecular Research Vol.26 No.13

A graft copolymer (PVDF-g-PAA) having poly(vinylidene fluoride) (PVDF) backbones and poly(acrylic acid) (PAA) side chains was synthesized using the radical polymerization method and the PVDF-g-PAA copolymer membrane was prepared via immersion phase inversion. Then the chitosan was immobilized on the surface of the copolymer membrane by covalent bond. The morphology, surface chemical structure and performance of the modified membranes were characterized by scanning electron microscopy, attenuated total reflection-Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, water contact angle, permeation measurement, antifouling and antibacterial tests. The results showed that the contact angle of the modified membrane decreased, and the water flux increased from 37.74Lm-2h-1 for pure PVDF membrane to 119.43 Lm-2h-1, which indicated that the modified membrane had higher hydrophilicity than unmodified membrane. The modified membrane has better antifouling properties than pure PVDF membrane due to the increase of surface hydrophilicity, and the highest water flux recovery ratio can achieve 93.2%. Furthermore, the modified membrane showed good antibacterial activity (E. coli), and the maximum antibacterial ratio of the modified membrane was 89.6%.

Cordblood-Based High-Throughput Screening for Deafness Gene of 646 Newborns in Jinan Area of China

Shou-Xia Li,Ding-Li Chen,Su-Bin Zhao,Li-Li Guo,Hai-Qin Feng,Xiao-Fang Zhang,Li-Li Ping,Zhi-Ming Yang,Cai-Xia Sun,Gen-Dong Yao 대한이비인후과학회 2015 Clinical and Experimental Otorhinolaryngology Vol.8 No.3

Objectives. Infants with slight/mild or late-onset hearing impairment might be missed in universal newborn hearing screening (UNHS). We identified the mutation hot spot of common deaf gene in the newborns in Jinan area population by screening the mutation spot with neonate cord blood, in order to make clear whether the neonate cord blood for screening is feasible. Methods. Six hundred and forty-six newborns were subjected to both UNHS and genetic screening for deafness by using neonate cord blood. The newborn genetic screening targeted four deafness-associated genes, which were commonly found in the Chinese population including gap junction beta-2 protein (GJB2), gap junction beta-3 protein (GJB3), solute carrier family 26 member 4 (SLC26A4), and mtDNA 12S rRNA. The most common 20 spot mutations in 4 deaf genes were detected by MassARRAY iPLEX platform and mitochondrial 12S rRNA A1555G and C1494T mutations were sequenced using Sanger sequencing. Results. Among the 646 newborns, 635 cases passed the UNHS and the other 11 cases (1.7%) did not. Of the 11 failures, two cases were found to carry homozygous GJB2 p.R143W pathogenic mutation, one case was found to have heterozygous GJB2 235delC mutation, and another one case carried heterozygous GJB3 p.R180X pathogenic mutation. Six hundred and thirty-five babies passed the newborn hearing screening, in which 25 babies were identified to carry pathogenic mutations, including 12 heterozygotes (1.9%) for GJB2 235delC, eight heterozygotes (1.3%) for SLC26A4 IVS7-2A>G, one heterozygote (0.2%) for p.R409H, two homozygotes (0.3%) for m.1494C>T, and two homozygotes (0.3%) for m.1555A>G. Conclusion. Newborn genetic screening through the umbilical cord blood for common deafness-associated mutations may identify carriers sensitive to aminoglycoside antibiotic, and can effectively prevent or delay hearing loss occurs.

从动态语义格的角度看“去+VP”和“VP+去”

팽조하 ( Peng Zhao Xia ) 한국외국어대학교 중국연구소 2021 中國硏究 Vol.89 No.-

The two sentence patterns "Qu(去)+VP" and "VP+Qu(去)" are very similar, but the meanings expressed by the two are different. This article intends to analyze the meaning of these two sentence patterns from the semantic relation structure of "qu" and "VP", and strive to make a reasonable explanation for their pragmatic differences. At the same time, with the help of case grammar theory, the dynamic semantic case relationship structure is constructed, and the semantic case entering the expression level is screened through perspective, thereby revealing the cognitive internal causes of the formation of the two structures.