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Improved photocatalytic performance of Pd-doped ZnO
Jun bo Zhong,Jian zhang Li,Xi yang He,Jun Zeng,Yan Lu,Wei Hu,Kun Lin 한국물리학회 2012 Current Applied Physics Vol.12 No.3
ZnO and Pd-doped ZnO photocatalysts with different molar ratio of Pd/Zn (1/100, 2/100, 3/100 and 4/100) were prepared by a solegel method. The photocatalysts prepared were characterized by BET surface area, X-ray diffraction (XRD), UV/vis diffuse reflectance (DRS) and surface photovoltage spectroscopy (SPS), respectively. The results show that doping Pd into ZnO decreases the BET surface area. The XRD spectra of the Pd-doped ZnO catalysts calcined at 773 K show only the characteristic peaks of wurtzite-type. Doping Pd into ZnO increases the absorbance of ZnO in visible region and enhances the photoinduced charge separation rate. The photocatalytic activity of Pd-doped ZnO photocatalysts for decolorization of methyl orange (MO) solution was evaluated, of all the photocatalysts prepared, the Pddoped ZnO with 3/100 possesses the best photocatalytic activity. The results of further experiments show that increased adsorption ability of light and high separation rate of photoinduced charge carriers all play an important role in promotion of photocatalytic activity of Pd-doped ZnO nanostructure.
Lu, Jian-Jun,Li, Heng-Ai,Xiong, Ying Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.11
Background: To explore the hospitalizations of breast cancer patients undergoing mastectomy, and to provide a basis for management, clinical prevention and treatment. Materials and Methods: We conducted an investigation by means of the retrospective survey and the medical records retrieval system, and made out the data of patients suffered from breast cancer in a hospital in Guangzhou from 2004 to 2013, including age, medical payment methods, pathological type, treatment, treatment results, complications, hospitalization days, cost and so on. Results: The average age of the inpatients was 50.14 years old. The main histologic types were infiltrating duct carcinoma (88.06%). The main surgery was modified radical mastectomy (80.41%). The cure rate was 90.80% during the 10 years. The main medical payment method was self-paying (57.28%). The average hospital stay was 13.51 days, and average hospitalization cost was RMB 23,083.66 yuan, proportion of drug fees up to 39.70%. Postoperative complication rate was 0.79%. The self-paying group was with the highest proportion of drug fees (P<0.05), while the free medical service group was with the longest hospitalization days (P<0.05). Conclusions: The payment methods significantly affected the proportion of drug fees and hospitalization days. The therapeutic effect was satisfactory with less complications and reasonable proportion of drug fees in our hospital.
Application of softened truss model with plastic approach to reinforced concrete beams in torsion
Lu, Jun-Kai,Wu, Wen-Hsiung Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.11 No.4
The present paper discusses the behavior of the reinforced concrete beams subjected to torsion by applying the endochronic plastic model in conjunction with the softened truss model. The endochronic constitutive equations are developed to describe the behavior of concrete. The mechanical behavior of concrete is decomposed into hydrostatic part and deviatoric part. New definition of the bulk modulus and the shear modulus are defined in terms of compressive strength of concrete. Also, new deviatoric hardening function is developed. Then, the endochronic constitutive equations of concrete are applied with the softened truss model for the behavior of the reinforced concrete beams subjected to torsion. The theoretical results obtained based on the present model are compared with the experimental data. The present model has shown the ability to describe the behavior of reinforced concrete beams subjected to torsion.
Lu, Huan-Jun,Li, Mei-Han,Li, Mei-Zhi,Park, Sang Eon,Kim, Min Sun,Jin, Yuan-Zhe,Park, Byung Rim The Korean Society of Pharmacology 2015 The Korean Journal of Physiology & Pharmacology Vol.19 No.5
Significant evidence supports the role of the vestibular system in the regulation of blood pressure during postural movements. In the present study, the role of the vestibulo-spino-adrenal (VSA) axis in the modulation of blood pressure via the vestibulosympathetic reflex was clarified by immunohistochemical and enzyme immunoassay methods in conscious rats with sinoaortic denervation. Expression of c-Fos protein in the intermediolateral cell column of the middle thoracic spinal regions and blood epinephrine levels were investigated, following microinjection of glutamate receptor agonists or antagonists into the medial vestibular nucleus (MVN) and/or sodium nitroprusside (SNP)-induced hypotension. Both microinjection of glutamate receptor agonists (NMDA and AMPA) into the MVN or rostral ventrolateral medullary nucleus (RVLM) and SNP-induced hypotension led to increased number of c-Fos positive neurons in the intermediolateral cell column of the middle thoracic spinal regions and increased blood epinephrine levels. Pretreatment with microinjection of glutamate receptor antagonists (MK-801 and CNQX) into the MVN or RVLM prevented the increased number of c-Fos positive neurons resulting from SNP-induced hypotension, and reversed the increased blood epinephrine levels. These results indicate that the VSA axis may be a key component of the pathway used by the vestibulosympathetic reflex to maintain blood pressure during postural movements.
Molecular and Biochemical Characterization of a Novel Intracellular Low-Temperature-Active Xylanase
( Jun Pei Zhou,),( Yan Yan Dong ),( Xiang Hua Tang ),( Jun Jun Li ),( Bo Xu ),( Qian Wu ),( Ya Jie Gao ),( Lu Pan ),( Zun Xi Huang ) 한국미생물 · 생명공학회 2012 Journal of microbiology and biotechnology Vol.22 No.4
A 990 bp full-length gene (xynAHJ2) encoding a 329- residue polypeptide (XynAHJ2) with a calculated mass of 38.4 kDa was cloned from Bacillus sp. HJ2 harbored in a saline soil. XynAHJ2 showed no signal peptide, distinct amino acid stretches of glycoside hydrolase (GH) family 10 intracellular endoxylanases, and the highest amino acid sequence identity of 65.3% with the identified GH 10 intracellular mesophilic endoxylanase iM-KRICT PX1-Ps from Paenibacillus sp. HPL-001 (ACJ06666). The recombinant enzyme (rXynAHJ2) was expressed in Escherichia coli and displayed the typical characteristics of low-temperatureactive enzyme (exhibiting optimum activity at 35 o C, 62% at 20 o C, and 38% at 10 o C; thermolability at ≥45 o C). Compared with the reported GH 10 low-temperature-active endoxylanases, which are all extracellular, rXynAHJ2 showed low amino acid sequence identities (<45%), low homology (different phylogenetic cluster), and difference of structure (decreased amount of total accessible surface area and exposed nonpolar accessible surface area). Compared with the reported GH 10 intracellular endoxylanases, which are all mesophilic and thermophilic, rXynAHJ2 has decreased numbers of arginine residues and salt bridges, and showed resistance to Ni 2+ , Ca 2+ , or EDTA at 10 mM final concentration. The above mechanism of structural adaptation for low-temperature activity of intracellular endoxylanase rXynAHJ2 is different from that of GH 10 extracellular low-temperature-active endoxylanases. This is the first report of the molecular and biochemical characterizations of a novel intracellular low-temperatureactive xylanase.
Stabilization of a Coupled ODE-wave System with Disturbances
Lu Lu,Yu-Long Zhang,Jun-Min Wang,Dong-Xia Zhao 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.3
This paper is devoted to stabilizing an ODE-PDE coupled system with boundary disturbance, where the PDE is chosen to be a wave equation with viscous damping. Applying the active disturbance rejection control (ADRC) technic, the unknown disturbance is estimated by the extended state observer (ESO). Assuming the absence of disturbance, the dynamic boundary connection is designed. The methods of spectral analysis and separation of operator are applied, which ensures the Riesz basis property as well as the spectrum determined growth condition. The exponential stability of the coupled system without disturbance is then concluded. Finally, combining the disturbance estimation and the dynamic boundary connection, a feedback controller designed to stabilize the coupled system, and the closed-loop system is proved to be asymptotically stable.
Individual Tree Growth Models for Natural Mixed Forests in Changbai Miuntains, Northeast China
Jun Lu,Fengri Li 한국산림과학회 2007 한국산림과학회지 Vol.96 No.2
collected from 712 remeasured permanent sample plots (25,526 trees) of 10-year periodic from 190 to20 in Baihe Forest Bureau of Changbai Mountains, northeast China. Based on analyzing relationshipbetween diameter increment of individual tres with tre size, competitive status, and site condition, thediameter growth models for individual trees of 15 species growing in mixed-species uneven-aged foreststands, that have simple form, good predicting precision, and easily applicable, were developed usingtree size and competition, however, the site conditions were not significantly related with diameterincrement. The tree size variables (lnDBH and DBH2) were the most significant and important predictorsof diameter growth existing in all 15 growth models. The diameter increment was directly proportional totree diameter for each species. For the competitive factors in growth model, the relative diameter (RD),canopy closure (P DDM) werecontributed to the diameter increment at a certain extent. Other measures of stand density, such as basalarea of stand (G) and stand density index (SDI), were not significantly influenced on diameter increment.Site factors, such as site index, slope and aspect were not important to diameter increment and excludedin the final models. The total variance explained by the final models of squared diameter increment (R2)(1990) for mixed conifer stands. Using independent data set, validation measures were evaluated forpredicting models of diameter increment developed in this study. The result indicated that the estimatedprecision was all greater than 94% and the models were suitable to describe diameter increment.