Comprehensive evaluation of high-temperature sintering behavior of sea sand vanadia-titania magnetite based on grey relational analysis

Zhen-xing Xing,Zhuang Huang,Gong-jin Cheng,He Yang,Xiangxin Xue,Guo-dong Zhang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.12

Sea sand vanadia-titania magnetite is difficult to pelletize, and it is difficult for iron and steel enterprises touse it as a raw material for ironmaking. In this paper, the high-temperature physicochemical characteristics and sinteringbehavior of sea sand vanadia-titania magnetite were comprehensively studied and systematically evaluated. Thehigh-temperature metallurgical physicochemical characteristics of different iron ore powders and under different experimentalconditions were studied by the micro-sintering experimental system. The high-temperature sintering indexeswere comprehensively evaluated by the grey correlation analysis, and the influence of sea sand ore on sintering performancewas investigated by sintering pot experiment. The research results show that the high-temperature sinteringcharacteristics of sea sand vanadia-titania magnetite were the worst, and the grey correlation degree was the lowest. The high-temperature sintering characteristics of sintered blocks with sea sand ore were affected by changing the basicityand the addition amount of sea sand ore. When the basicity was 0.8 and the addition amount of sea sand ore was15 wt%, the evaluation index of grey relational analysis was the best. The vertical sintering speed and tumble indexwere slightly reduced by adding sea sand ore, but the sinter yield was improved and the particle size distribution of sinterwas optimized. The experimental results provide a certain data reference for the actual production of sinter with seasand vanadia-titania magnetite.

Damage identification in beam-like pipeline based on modal information

Yang, Zhi-Rong,Li, Hong-Sheng,Guo, Xing-Lin,Li, Hong-Yan Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.2

Damage detection based on measured vibration data has received intensive studies recently. Frequently, the damage to a structure may be reflected by a change of some system parameters, such as a degradation of the stiffness. In this paper, we apply a method to nondestructively locate and estimate the severity of damage in corrosion pipeline for which a few natural frequencies or mode shapes are available. The method is based on the strain modal sensitivity ratio (SMSR) and the orthogonality conditions sensitivities (OCS) applied to vibration features identified during the monitoring of the pipeline. The advantage of these methods is that it only requires measuring few modal parameters. The SMSR-based and OCS-based damage detection methods are illustrated using computer-simulated and laboratory testing data. The results show that the current method provides a precise indication of both the location and the extent of corrosion pipeline.

Hollow CuO nanospheres uniformly anchored on porous Si nanowires: preparation and their potential use as electrochemical sensors.

Guo, Zheng,Seol, Myeong-Lok,Kim, Moon-Seok,Ahn, Jae-Hyuk,Choi, Yang-Kyu,Liu, Jin-Huai,Huang, Xing-Jiu RSC Pub 2012 Nanoscale Vol.4 No.23

<P>Hollow CuO nanospheres have been prepared via a reduction reaction of copper ions on porous Si nanowires combined with calcination in air and uniformly anchored on their surfaces. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) were employed to characterize and analyze as-synthesized samples. The results reveal that Si nanowires fabricated from heavily doped Si wafer are formed with a meso-porous structure by an Ag-assisted etching approach, and Cu nanoparticles are formed and uniformly decorated on the Si nanowires through a reaction of copper ions reduced by silicon. After annealing in air, Cu nanoparticles are in situ oxidized and transformed into CuO, leading to the formation of hollow nanospheres because of the Kirkendall effect. The diameter size of as-prepared CuO hollow spheres anchored on porous Si nanowires is mainly around 30 nm. Finally, in order to illuminate the advantages of this novel hybrid nanostructure of nanosized hollow spheres supported on porous nanowires, its electrochemical sensing performance to hydrazine as an example has been further investigated. The results confirm that it is a good potential application to detect hydrazine.</P>

Two Androstane Derivatives from the Cultures of Fungus Marasmiellus ramealis (Bull.) Singer

Yang, Ning-Ning,Ma, Qing-Yun,Huang, Sheng-Zhuo,Dai, Hao-Fu,Guo, Zhi-Kai,Yu, Zhi-Fang,Zhao, You-Xing Korean Chemical Society 2014 Bulletin of the Korean Chemical Society Vol.35 No.11

A new androstane derivative, $4{\beta}$-methyl-15-oxa-$14{\beta}$-androstane-7-ene-$4{\alpha}$-carboxylic acid (1) and a known one $4{\beta}$-methyl-15-oxa-$14{\beta}$-androstane-7-ene-$4{\alpha}$-hydroxyl (2) were isolated from the EtOAc extract of the cultures of the fungus Marasmiellus ramealis (Bull.) Singer. Their structures were elucidated on the basis of 1D and 2D NMR as well as MS spectroscopic data analysis. The inhibitory activity of two isolates against acetylcholinesterase (AChE) revealed that compound 1 exhibited definitely inhibitory activity.

On the uniform consistency of frequency polygons for ψ-mixing samples

Guo-dong Xing,Shan-chao Yang,Xin Liang 한국통계학회 2015 Journal of the Korean Statistical Society Vol.44 No.2

In this article, the frequency polygon investigated by Scott (1985) is studied as a nonparametric estimator for ψ-mixing samples. Under mild conditions, we prove the uniformly strong consistency of the estimator and obtain the corresponding rate of convergence which is nearly equal to the one obtained by Carbon et al. (1997) and, our results weaken the relevant conditions used by Carbon et al. (1997). In addition, the uniformly weak consistency is also given.

A remark on the Bahadur representation of sample quantiles for negatively associated sequences

Guo-dong Xing,Shan-chao Yang 한국통계학회 2011 Journal of the Korean Statistical Society Vol.40 No.3

Under mild conditions, we investigate further the Bahadur representation of sample quantiles for negatively associated sequences, whose convergence rate is faster than the corresponding one in Ling (2008).

PLCE1 Gene in Esophageal Cancer and Interaction with Environmental Factors

Guo, Li-Yan,Zhang, Shen,Suo, Zhen,Yang, Chang-Shuang,Zhao, Xia,Zhang, Guo-An,Hu, Die,Ji, Xing-Zhao,Zhai, Min Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7

Objective: To study the PLCE1 gene rs2274223 polymorphism with regard to esophageal cancer and its interaction with diet, lifestyle, psychological and environmental factors in Southwest Shandong province. Materials and Methods: A case series study (case-case) was conducted. Questionnaire data were collected and 3 ml-5ml venous blood was drawn for DNA extraction among the qualified research subjects. PLCE1 gene polymorphism was detected after PCR amplification of DNA. SPSS 13.0 software was used for statistical analysis of the data. Results: The three genotypes A/A, A/G and G/G PLCE1 gene rs2274223 was 31, 16 and 4 cases, accounting for 60.8%, 31.4%, 0.08% respectively. The difference of three genotypes (AA/GA/GG) proportion between negative and positive family history of patients was statistically significant, ${\chi}^2=6.213$, p=0.045. There was no statistically significant relationship between PLCE1 gene rs2274223 polymorphism and smoking, drinking, ${\chi}^2=0.119$, p=0.998, and ${\chi}^2=1.727$, p=0.786. There was no linkage of the three rs2274223 PLCE1 gene genotypes (AA/GA/GG) proportion with eating fried, pickled, hot, mildew, overnight, smoked, excitant food, eat speed, salt taste or not (p>0.05). or with living environment pollution and nine risk factors of occupational exposure (p>0.05). There was no statistically significant difference in TS scores between different genotype of rs2274223 PLCE1 gene. Conclusions: The PLCE1 rs2274223 polymorphism has a relationship with family history of esophageal cancer, but does not have any significant association with age, gender, smoking, alcohol drinking, food hygiene, eating habits, living around the environment and occupation in cases.

Sensitive and selective electrochemical detection of dopamine using an electrode modified with carboxylated carbonaceous spheres

Guo, Zheng,Seol, Myeong-Lok,Kim, Moon-Seok,Ahn, Jae-Hyuk,Choi, Yang-Kyu,Liu, Jin-Huai,Huang, Xing-Jiu The Royal Society of Chemistry 2013 The Analyst Vol.138 No.9

<P>A highly sensitive and selective electrochemical sensor of dopamine (DA) has been developed by employing carboxylated carbonaceous spheres to modify glassy carbon electrodes (GCEs). Scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy were used to characterize as-prepared carbonaceous spheres. The results show that the diameter of carboxylated carbonaceous spheres is uniformly 500 nm and that their surfaces mainly expose carboxyl groups with negative charges. Electrochemical measurements demonstrate that carboxylated carbonaceous spheres greatly improve the accumulation of positively charged dopamine, leading to good sensing performance on a modified GCE. Through applying the differential pulse voltammetric approach, linear calibration curves were obtained in a range of about 0.1 to 40 μM with a detection limit down to 30 nM. Furthermore, depending on the charge-based discrimination, the modified electrode displays good selective detection of DA and reliable anti-interference to UA and glucose besides a weak and negligible response to AA. Therefore, the carboxylated carbonaceous sphere introduced here is a good candidate to develop electrochemical sensors for the sensitive and selective detection of DA.</P> <P>Graphic Abstract</P><P>Carboxylated carbonaceous spheres (CCSs) reproducibly supported as advanced electrode coating for the determination of dopamine with high sensitivity, good selectivity and response stability. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3an36669c'> </P>

Chemical, optical, and electrical characterization of Ga2O3 thin films grown by plasma-enhanced atomic layer deposition

Xing Li,Hong-Liang Lu,Hong-Ping Ma,Jian-Guo Yang,Jin-Xin Chen,Wei Huang,Qixin Guo,Jijun Feng,David Wei Zhang 한국물리학회 2019 Current Applied Physics Vol.19 No.2

Thin Ga2O3 films were grown on Si (100) using trimethylgallium (TMG) and oxygen as the precursors through plasma-enhanced atomic layer deposition. The depositions were made over a temperature range of 80–250 °C with a growth per cycle of around 0.07 nm/cycle. Surface self-saturating growth was obtained with TMG pulse time ≥20 ms at a temperature of 150 °C. The root mean square surface roughness of the obtained Ga2O3 films increased from 0.1 nm to 0.3 nm with increasing the growth temperature. Moreover, the x-ray photoelectron spectroscopy analysis indicated that the obtained film was Ga-rich with the chemical oxidation states Ga3+ and Ga1+, and no carbon contamination was detected in the films after Ar+ sputtering. The electron density of films measured by x-ray reflectivity varied with the growth temperature, increasing from 4.72 to 5.80 g/cm3 . The transmittance of Ga2O3 film deposited on a quartz substrate was obtained through ultraviolet visible (UV–Vis) spectroscopy. An obvious absorption in the deep UV region was demonstrated with a wide band gap of 4.6–4.8 eV. The spectroscopic ellipsometry analysis indicated that the average refractive index of the Ga2O3 film was 1.91 at 632.8 nm and increased with the growth temperature due to the dense structure of the films. Finally, the I-V and C-V characteristics proved that the Ga2O3 films prepared in this work had a low leakage current of 7.2 × 10−11 A/cm2 at 1.0 MV/cm and a high permittivity of 11.9, suitable to be gate dielectric.

Continuous Transarterial Infusion Chemotherapy with Gemcitabine and 5-Fluorouracil for Advanced Pancreatic Carcinoma

Hong, Guo-Bin,Zhou, Jing-Xing,Sun, Hua-Bin,Li, Chun-Yang,Song, Li-Qing Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.6

Purpose: Pancreatic carcinoma is one of the most malignant tumors of the alimentary system, with relatively high incidence rates. The purpose of this study was to assess the efficacy and safety of two regimens for advanced pancreatic carcinoma: continuous transarterial infusion versus systemic venous chemotherapy with gemcitabine and 5-fluorouracil. Methods: Of the 48 patients with advanced pancreatic carcinoma receiving chemotherapy with gemcitabine and 5-fluorouracil, 24 received the selective transarterial infusion, and 24 the systemic chemotherapy. For the continuous transarterial infusion group (experimental group), all patients received gemcitabine 1000 mg/$m^2$, given by 30-minute transarterial infusion, on day 1 of a 4-week cycle for 2 cycles, and a dose of 600 mg/$m^2$ 5-fluorouracil was infused on days 1~5 of a 4-week cycle for 2 cycles. For the systemic venous group (control group), gemcitabine and 5-fluorouracil were infused through a peripheral vein, a dose of 1000 mg/$m^2$ gemcitabine being administrated over 30 min on days 1 and 8 of a 4-week cycle for 2 cycles, and a dose of 600 mg/$m^2$ 5-fluorouracil was infused on days 1~5 of a 4-week cycle for 2 cycles. The effectiveness and safety were evaluated after 2 cyclesaccording to WHO criteria. Results:The objective effective rate in transarterial group was 33.3% versus 25% in the systemic group, the difference not being significant (P=0.626). Clinical benefit rates(CBR) in the transarterial and systemic groups were 83.3% and 58.3%, respectively (P=0.014). The means and medians for survival time in transarterial group were higher than those of the systemic group (P < 0.005). at the same time, the adverse effects did not significantly differ between the two groups (P > 0.05). Conclusion: Continuous transarterial infusion chemotherapy with gemcitabine and 5-fluorouracil could improve clinical benefit rate and survival time of patients with advanced pancreatic carcinoma, compared with systemic venous chemotherapy. Since adverse effects were limited in the transarterial group, the regimen of continuous transarterial infusion chemotherapy can be used more extensively in clinical practice. A CT and MRI conventional sequence can be used for efficacy evaluation after chemotherapy in pancreatic carcinoma.