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Kinetics and numerical simulation of self-propagating high-temperature synthesis in Ti–Cr–Al–C systems

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Rare Metals 2014年第5期33卷 527-533页

作者： Guo-Bing ying Xiao-Dong He shan-yi du Yong-Ting Zheng Chun-Cheng Zhu Yu-Ping Wu Cheng Wang Institute of Metals and Protection College of Mechanics and Materials Hohai University Center for Composite Materials and Structure Harbin Institute of Technology College of Chemistry and Chemical Engineering Harbin Normal University

In this paper, Ti–Cr–Al–C materials were investigated by self-propagating high-temperature synthesis（SHS） according to the experimental study and numerical simulation results. The highest adiabatic combustion temperature Tadof 2,467.45 K indicates that the2Ti–0Cr–Al–C is the highest exothermic reaction system in the Ti–Cr–Al–C system. The adiabatic combustion temperature decreases with the increase of the Cr content. And a higher exothermal reaction would result in higher porosity which is induced by the high temperature and pressure of C reducing atmosphere and Al vapor. Combustion characterization of the products shows that the geometrical alternating layers result in the high exothermal reaction and flame-front propagating velocity. The higher the Tadis, the thinner the layer is. To demonstrate the process of the microscopic characterization and show the detailed combustion process closed to the experimental observations, the flame-front propagating velocity and temperature distribution were simulated numerically.

关键词： Self-propagating high-temperature synthesis Temperature distribution Flame-front propagating velocity Numerical simulation

Long-Term Effects of a High-Protein Diet on Glucose Metabolism After Early Postnatal Malnutrition in Rats with Intrauterine Growth Retardation

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中国当代儿科杂志 2002年第4期 335-338页

作者： LIU Jun, QIU Xiao shan, ZHANG yi Jian, du Min Lian, ZHENG Shu Sen(Department of Pediatrics, First Affiliated Hospital, Sun Yat sen University of Medical Sciences, Guangzhou 510080, China)

Objective To investigate the long term effects of a high protein diet on glucose metabolism after early postnatal malnutrition in rats with intrauterine growth retardation (IUGR). Methods An IUGR rat model was established by passive smoking. One hundred and twenty nine IUGR pups were assigned randomly into 3 groups: IUGR control group, IUGR low protein group and IUGR high protein group. Forty two normal pups were used as controls. Both the IUGR control group and the non IUGR controls were fed with a 20% (normal) protein diet after birth. Both the low protein and high protein IUGR groups were fed with an 8% low protein diet for the first 4 weeks of life, and then the former were fed with a 20% protein diet, while the latter were fed with a 30% high protein diet. The glucose tolerance test and insulin release test were performed at the 4th, 6th and 48th weeks of life and the insulin sensitive index (ISI) was calculated in the four groups. Results Although the fasting blood glucose was normal in the low protein and high protein groups at the 4th week, the fasting plasma insulin, and blood glucose and insulin concentrations after glucose loading increased and ISI decreased compared with the controls (P< 0.01 ). At the 6th week the fasting blood glucose was normal and the fasting plasma insulin declined, while ISI increased in the low protein and high protein groups. These were significantly different from the controls (P< 0.05 ). By week 48, both the fasting plasma glucose and insulin concentration in the high protein group [( 5.97 ± 0.88 ) mmol/L and ( 42.28 ± 13.36 ) μU/ml, respectively] and the low protein group [( 5.24 ± 1.35 ) mmol/L and ( 31.22 ± 3.36 ) μU/ml, respectively] were significantly higher than those of the controls [( 4.46 ± 1.11 mmol/L and ( 15.82 ± 1.63 μU/ml, respectively]. At the same time, the level of ISI in the high protein group ( 1.32 ± 0.56 ) and the low protein group ( 1.71 ± 0.44 ) declined compared to the controls ( 2.80 ± 0.15 ) (P<

关键词： Intrauterine growth retardation High protein Glucose metabolism Rat

Mesoscopic investigation on moduli prediction in visco-elastic particle reinforced composites

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Mesoscopic investigation on moduli prediction in visco-elast...

Effect of Carbon Particles with Different Topological Shape on the Rheological Behavior of PVA Aqueous Dispersion

第五届国际非线性力学会议

作者： Bao-lai Wang~1 Yang Liu~1 Jun Liang~1 shan-yi du~1 (Center for Composite Materials and Structure Harbin Institute of Technology Harbin 150001 China)

＜正＞The visco-elastic mechanism of particles reinforced composites has been investigated through revised Eshelby equivalent inclusion theory.A visco-elastic model is applied. Furthermore,by introducing Heaviside step function and Laplace transform,the creep constitutional equation related to strain rate effect is ***,by equivalent inclusion theory,introducing secant modulus,the material moduli with time and volume fraction concerning Glass/ED6 particles reinforced materials have been *** results show that the visco-elastic property of composite material is mainly determined by the visco-elastic behavior of the matrix,which agree with experimental results *** can be concluded from the results that there exits close relationship between the inclusion shape,volume fraction and loading path.

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来源： cnki会议评论

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cnki会议

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Chinese Journal of Polymer Science 2022年第11期40卷 1402-1410页

作者： Qing-Sheng Ni Miao du Guo-Rong shan yi-Hu Song Qiang Zheng State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou310027China Institute of Zhejiang University-Quzhou Quzhou324000China Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou310027China

Poly(vinyl alcohol)(PVA)is usually processed and used in a form of aqueous dispersion.A large number of inter-and intramolecular hydrogen bonds make it very difficult to obtain suitable rheological behavior for *** this study,carbon particles with different topological shapes were added into PVA aqueous dispersion to tune the steady and dynamic rheological *** results show that the zero-dimensional particles(carbon black,CB)increase monotonically the zero-shear viscosity of PVA dispersion,while the one-dimensional particles(carbon nanotubes,CNTs)make it first increase,and then decrease and rise again,like an N-shape,and the two-dimensional particles(graphene oxide,GO)can make it first decrease and then increase,exhibiting a *** is believed that the topological shape of the carbon particles brought about these *** zero-dimensional particles mainly act as physical crosslinking points due to their small *** at a certain content,both CNTs and GO can destroy the intermolecular hydrogen bonds between PVA chains because the PVA chains can twine around the slim CNTs and the large planar size of GO prevents the adsorbed PVA from forming hydrogen bond with other *** high hydroxyl value of carbon particle surface could strengthen this *** is expected that the viscosity of polymer dispersion can be regulated by particles with different topological shape and the surface characteristic,so as to widen the operable concentration range during preparing composite functional materials.

关键词： Topological shape Hydrogen bond Rheological behavior PVA aqueous dispersion

Application of Improved Fuzzy Immune PID Controller to Bending Control System

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Journal of Iron and Steel Research International 2011年第3期18卷 28-33页

作者： REN Xin-yi du Feng-shan HUANG Hua-gui ZHANG shang-bin Institute of Mechanical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina

Based on the hydraulic bending control system,the electrohydraulic servo pressure control simulation model is *** into account of the inadequacy of P-type immune feedback controller,an improved fuzzy immune PID controller is put *** on immune feedback principle of biological immune system,the P-type immune feedback controller is connected with conventional PID controller in series and then in parallel with design fuzzy immune PID *** controller parameters can be adjusted on line by the rules of immune feedback controller and fuzzy *** order to gain the optimal parameters of the controller,the parameters of the controller are off-line optimized by the best multiple optimal model PSO *** simulation results indicate that the method has characteristics of small overshoot,short adjusting time and strong anti-interference ability and *** quality of the strip shape can be further improved.

关键词： electrohydraulic bending system immune feedback control fuzzy control PSO algorithm strip shape

Effectiveness of Using Mean Corpuscular Volume and Mean Corpuscular Hemoglobin for Beta-thalassemia Carrier Screening in the Guangdong Population of China

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Biomedical and Environmental Sciences 2021年第8期34卷 667-671页

作者： GU Heng WANG Yong Xia du Meng Xuan XU shan shan ZHOU Bing yi LI Ming Zhen NHC Key Laboratory of Male Reproduction and Genetics Family Planning Research Institute of Guangdong ProvineeGuangzhou 510000GuangdongChina Department of Public Health and Preventive Medicine Jinan UniversityGuangzhou 510000GuangdongChina

Beta(β)-thalassemia is one of the most common hemoglobinopathies worldwide,creating major public health problems and social burdens in many *** forβ-thalassemia carriers is crucial for controlling this *** investigate the?effectiveness?of?mean?corpuscular?volume?(MCV)and mean corpuscular hemoglobin(MCH)for screeningβ-thalassemia,retrospective data were analyzed for 6,779β-thalassemia carriers subjected to genetic testing following thalassemia screening in Guangdong province between January 2018 and December 2019.

关键词： Guangdong Population thalassemia

Parametrized post-Newtonian secular transit timing variations for exoplanets

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Research in Astronomy and Astrophysics 2013年第10期13卷 1231-1239页

作者： shan-shan Zhao yi Xie Department of Astronomy Nanjing University Key Laboratory of Modern Astronomy and Astrophysics Nanjing University Ministry of Education

Ground-based and space-borne observatories used for studying exoplanet transits now and in the future will considerably increase the number of exoplanets known from transit data and the precision of the measured times of transit *** in the transit times can not only be used to infer the presence of additional planets,but might also provide opportunities to test the general theory of relativity in these *** build a framework for these possible tests,we extend previous studies on the observability of the general relativistic precessions of periastron in transiting exoplanets to variations in secular transit timing under parametrized post-Newtonian *** find that if one can measure the difference between observed and predicted variations of general relativistic secular transit timing to 1 s yr-1in a transiting exoplanet system with a Sun-like mass,a period of;day and a relatively small eccentricity of;.1,general relativity will be tested to the level of;%.

关键词： gravitation celestial mechanics planetary systems

Perioperative transcutaneous electrical acupoint stimulation for improving postoperative gastrointestinal function:A randomized controlled trial

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Journal of Integrative Medicine 2021年第3期19卷 211-218页

作者： Wen-jing Li Chao Gao Li-xin An Yu-wei Ji Fu-shan Xue yi du Department of Anesthesiology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Department of Anesthesiology Beijing Hui-Min HospitalBeijing 100053China Department of Traditional Chinese Medicine Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

Background:Postoperative gastrointestinal dysfunction(PGD)is one of the most common complications in patients undergoing major abdominal *** has been used widely in gastrointestinal diseases due to its effectiveness and minimally invasive ***:This study evaluated the efficacy of using transcutaneous electrical acupoint stimulation(TEAS)during the surgery and postoperative recovery in patients with gastric and colorectal surgery for improving postoperative gastrointestinal ***,setting,participants and interventions:A total of 280 patients undergoing abdominal surgery were stratified by type of surgery(i.e.,gastric or colorectal surgery)and randomly allocated into the TEAS group(group T)or the sham group(group S).Patients in group T received TEAS at LI4,PC6,ST36 and *** in group S received pseudo-TEAS at sham *** stimulation was given from 30 min before anesthesia until the end of *** same treatment was performed at 9 am on the 1st,2nd and 3rd days after surgery,until the recovery of flatus in *** outcome measures:The primary outcome was the time to the first bowel motion,as detected by *** secondary outcomes included the first flatus and ambulation time,changes of perioperative substance P(SP),incidence of PGD,postoperative pain,postoperative nausea and vomiting(PONV)and some economic ***:The time to first bowel motion,first flatus and first ambulation in group T was much shorter than that in group S(P<0.01).In patients undergoing colorectal surgery,the concentration of SP was lower in group T than in group S on the third day after the operation(P<0.05).The average incidence of PGD in all patients was 25%,and the frequency of PGD was significantly lower in group T than in group S(18.6%vs.31.4%,respectively;P<0.05).TEAS treatment(odds ratio=0.498;95%confidence interval:0.232–0.786)and type of surgery were relevant factors for the development of ***

关键词： Transcutaneous electrical acupoint stimulation Postoperative period Gastrointestinal disorders Substance P

The efficacy and safety of besifloxacin for acute bacterial conjunctivitis: a Meta-analysis

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International Journal of Ophthalmology(English edition) 2019年第6期12卷 1027-1036页

作者： Jun-Jie Wang Xin-yi Gao Hong-Zhuo Li shan-Shuang du Changzhi Medical College Changzhi 046000Shanxi ProvinceChina Shaanxi Ophthalmic Medical Center Xi’an No.4 HospitalAffiliated Guangren HospitalSchool of MedicineXi’an Jiaotong UniversityXi’an 710004Shaanxi ProvinceChina Heping Hospital Affiliated to Changzhi Medical College Changzhi 046000Shanxi ProvinceChina

AIM: To evaluate the relative efficacy and safety of besifloxacin for treatment of acute bacterial ***: A comprehensive search in PubMed, EMBASE Web of Science, Cochrane Central Database and CNKI was undertaken for randomized controlled trials(RCTs) comparing besifloxacin with other treatments or placebo. The primary outcome measures were clinical resolution, rates of bacterial eradication, individual clinical outcomes, cure rates, and bacterial eradication rates of different kinds of pathogens. Safety outcomes were the number of adverse effects(AEs). The final search was performed on August ***: Eight RCTs were included. Five studies compared the efficacy and safety of besifloxacin with placebo, 2 studies compared besifloxacin with moxifloxacin, and 1 study compared besifloxacin with gatifloxacin. A total of 3105 patients met the inclusion criteria. Besifloxacin presented higher efficacy and safety than did placebo in clinical resolution, rates of bacterial eradication, individual clinical outcomes, cure rates, bacterial eradication rates of different kinds of pathogens and the number of AEs. There was no significant difference between besifloxacin and moxifloxacin or gatifloxacin in the comparison items mentioned ***: Besifloxacin is highly effective and safe for treatment of acute bacterial conjunctivitis. Further comparative trials regarding the effect of besifloxacin for treatment of acute bacterial conjunctivitis will aid in treatment decisions.

关键词： besifloxacin acute bacterial conjunctivitis Meta-analysis randomized controlled trials