Effect of sintering temperature on properties of lightweightporous ceramics prepared by foam impregnation method

Zhili Cui,Shiming Xiao,Xianli Luo,Yunxuan Liu,Ming Liu,Yuyun Zeng,Xiaoli Zhong,Hong Zheng,Haifeng Guo 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.5

In this paper, cheap mineral materials were used as the base materials of lightweight porous ceramics prepared through foamimpregnation method. The effect of the sintering temperature on the properties of the prepared porous ceramics was studied. The porous ceramic was mainly composed of amorphous silicon oxide, crystalline cordierite and mullite phases, and a smallamount of alumina phase. As the sintering temperature increased, the porosity of porous ceramics gradually decreased from94% to 92%, and the bulk density increased from 0.173 gcm-3 at 1100 ℃ to 0.194 gcm-3 at 1200 ℃. The best sinteringtemperature was 1180 ℃. The porosity of the porous ceramics sintered at 1180 ℃ was 92.14%, the volume weight was 0.189gcm-3, the shrinkage rate was 15.80%, the compressive strength was 0.79 MPa, and the thermal conductivity was 0.295 Wm-1k-1. The lightweight porous ceramic has high porosity, low density and good thermal insulation, as well as low cost, having greatpotential for application in fields such as thermal insulation, adsorption, and environmental protection.

Coordination of intra and inter-individual leaf traits according to leaf phenology and plant age for three temperate broadleaf species with different shade tolerances

Zhili Liu,Feng Jiang,Fengri Li,Guangze Jin 강원대학교 산림과학연구소 2018 강원대학교 산림과학연구소 학술대회 Vol.2018 No.09

Intraspecific leaf economic spectrum (LES) traits vary considerably with leaf phenology and plant age, but whether these trait patterns significantly vary between species with different shade tolerances at local scales has rarely been examined. The presence of LES within species at local scales has recently been debated; however, the conclusions are far from universal, and whether the trait-trait relationships are modulated by leaf phenology and plant age needs to be tested. We measured six leaf traits (i.e., specific leaf area, leaf dry matter content, leaf thickness, mass-based leaf nitrogen content, leaf phosphorus content and ratio of nitrogen and phosphorus contents) among different leaf phenological stages (young, mature and old leaves) and plant ages (adult and sapling) for three temperate broadleaf species with different levels of shade tolerance. Intraspecific trait variation (ITV) obviously depended on the species and traits, and interspecies trait variation patterns were inconsistent with the LES prediction. Specific leaf area significantly decreased as the shade tolerance of a species increased, which was in contrast with the global LES prediction. Additionally, 36% and 25% of ITV was explained by leaf phenology and plant age, respectively, for the overall leaf traits of the three species. Generally, global LES holds at the local scale, but trait-trait relationships were strongly modulated by leaf phenology and plant age. The ITV among the leaf phenology and plant age stages was driven by the LES axis and leaf thickness, respectively. We highlight the importance of leaf phenology and plant age on ITV and trait-trait relationships. We provide direct evidence of the LES at a local spatial scale and a seasonally temporal scale, but we argue that variations in LES traits are always reliable for predicting the resource-use strategies of plants at local scales.

Association of Apolipoprotein E Polymorphisms with White Matter Lesions and Brain Atrophy

ZhiLi Niu,PingAn Zhang,Dong Li,ChengLiang Zhu,LiNa Feng,Ge Xiong,NaNa Song,Pei Tang,Feng Liu 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.2

Objective Apolipoprotein E (ApoE) is mainly synthesized in the liver. So far, it is unknown the relationship among APOE gene polymorphisms and WML, brain atrophy. Therefore, the aim of the study was to assess the associations of APOE gene polymorphisms in patients with WML and brain atrophy. Methods A total of 58 patients with WML, 128 patients with brain atrophy, 112 patients with co-occurrence of WML and brain atrophy and 95 healthy elderly volunteers were recruited from Renmin Hospital of WuHan University. Results Allele E3 was the most common allele. The alleles E2 had significantly higher levels of ApoB and lower age in WML group. The alleles E2 was associated with the lower level of ApoB, LDL-Ch, TCh, and sdLDL in co-occurrence group. The E3/E3 genotype has higher level of sdLDL, but lower age and female frequency in WML. The E3/E4 genotype had higher level of TG, but lower age in WML. Gender, Age, E2, Hyperhomocysteinemia and UA were also significantly associated with disease progression. Conclusion This study found that clinical data, lipids and metabolic complications were closely related to ApoE genotypes and alleles, and also disease progression and type.

Nano-structured and architecturally engineered thin films and optical surfaces

Weiguo LIU,Shaobo GE,Zhili CHEN,Bing SHI 한국진공학회 2016 한국진공학회 학술발표회초록집 Vol.2016 No.8

Multivalency-Driven Formation of Te-Based Monolayer Materials: A Combined First-Principles and Experimental study

Zhu, Zhili,Cai, Xiaolin,Yi, Seho,Chen, Jinglei,Dai, Yawei,Niu, Chunyao,Guo, Zhengxiao,Xie, Maohai,Liu, Feng,Cho, Jun-Hyung,Jia, Yu,Zhang, Zhenyu American Physical Society 2017 Physical Review Letters Vol.119 No.10

<P>Contemporary science is witnessing a rapid expansion of the two-dimensional (2D) materials family, each member possessing intriguing emergent properties of fundamental and practical importance. Using the particle-swarm optimization method in combination with first-principles density functional theory calculations, here we predict a new category of 2D monolayers named tellurene, composed of the metalloid element Te, with stable 1T-MoS2-like (alpha-Te), and metastable tetragonal (beta-Te) and 2H-MoS2-like (gamma-Te) structures. The underlying formation mechanism is inherently rooted in the multivalent nature of Te, with the central-layer Te behaving more metal-like (e.g., Mo), and the two outer layers more semiconductorlike (e.g., S). We also show that the alpha-Te phase can be spontaneously obtained from the magic thicknesses divisible by three layers truncated along the [ 001] direction of the trigonal structure of bulk Te, and both the alpha- and alpha-Te phases possess electron and hole mobilities much higher than MoS2. Furthermore, we present preliminary but convincing experimental evidence for the layering behavior of Te on HOPG substrates, and predict the importance of multivalency in the layering behavior of Se. These findings effectively extend the realm of 2D materials to group-VI elements.</P>

Magnetic Anisotropies in Cobalt-Nickel Ferrites (NixCo1-xFe2O4)

Binghai Liu,Jun Ding,Jiabao Yi,Jianhua Yin,Zhili Dong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5

This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects. This work presents a detailed study on the various magnetic anisotropies of NixCo1..xFe2O4 prepared by using a mechanochemical process. The results indicated that the magnetic anisotropy of NixCo1..xFe2O4 was strongly correlated with the Co2+ concentration. The Ni2+ substitution readily led to a decrease in the magnetocrystalline anisotropy and coercivity. While a large uniaxial anisotropy was induced in CoFe2O4 by magneto-annealing, the uniaxial anisotropy decreased with the Ni concentration in NixCo1..xFe2O4 and disappeared in the pure NiFe2O4. A short-time mechanical milling was found to signicantly increase the coercivity in NixCo1..xFe2O4 samples and high coercivities of 5.1 kOe and 2.8 kOe were achieved in the CoFe2O4 and the Ni0:5Co0:5Fe2O4 samples respectively. The microstructure and magnetic studies indicated that the milling-induced high coercivity could be ascribed to milling-induced stress anisotropy and to the pinning eects of defects.

Do Analysts’ Cross-year Revisions Contain Information about Audit Adjustment? Evidence from the Chinese Capital Market

Qingqing Liu,Songsheng Chen,Zhili Tian 한국증권학회 2021 Asia-Pacific Journal of Financial Studies Vol.50 No.4

This study tests the information content of changes in analysts’ earnings forecasts. Using audit adjustment data from China, this study investigates whether changes in analysts’ crossyear forecast revisions reflect audit information. The results show that the cross-year revision of analysts’ earnings per share forecasts is positively related to the magnitude of audit adjustment, which may be mainly due to analysts’ communication with management. Furthermore, analysts who display higher forecast frequency, who issue their last forecast closer to the day the annual report is announced, or who show better forecast performance reflect a greater amount of audit information in their cross-year forecast revisions.

A Chlamydomonas reinhardtii nuclear-encoded MinE homologue recognizes the Escherichia coli division site, and the evolutionary implications of MinE gene transfer from chloroplast to nucleus

Lei Wang,Zhili Wu,Linyan Li,Weizhong Liu,Yong Hu 한국식물학회 2017 Journal of Plant Biology Vol.60 No.2

Escherichia coli MinE is required for placement of a division septum. A nucleus-encoded and plastidtargeted MinE homologue, CrMinE, was identified from Chlamydomonas reinhardtii. Similar to the Arabidopsis nucleus-encoded AtMinE, the CrMinE protein possesses extra N-terminal and C-terminal extensions relative to the eubacterial and other algal plastid-encoded MinE proteins. The CrMinE protein functions in plastids, as revealed by a transient expression assay using a full-length CrMinE protein fused to enhanced green fluorescent protein. In addition, the overexpressed CrMinE:EGFP in wild-type E. coli with clear coiled structures could still recognize the cell division site of the host cell, which suggests evolutionary conservation of the MinE mode of action. No MinE homologue was found in a search of all researched plastid genome sequences of land plants; moreover, the researched MinEs of land plants are encoded by nuclear genomes. Thus, the identification of the CrMinE located in the nuclear genome implies that the transfer events of MinE from plastid to nucleus might have occurred before the evolution of land plants and during the evolution of green algae.

A general active-learning method for surrogate-based structural reliability analysis

Congyi Zha,Zhili Sun,Jian Wang,Chenrong Pan,Zhendong Liu,Pengfei Dong 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.83 No.2

Surrogate models aim to approximate the performance function with an active-learning design of experiments (DoE) to obtain a sufficiently accurate prediction of the performance function’s sign for an inexpensive computational demand in reliability analysis. Nevertheless, many existing active-learning methods are limited to the Kriging model, while the uncertainties of the Kriging itself affect the reliability analysis results. Moreover, the existing general active-learning methods may not achieve a fully satisfactory balance between accuracy and efficiency. Therefore, a novel active-learning method GLM- CM is constructed to yield the issues, which conciliates several merits of existing methods. To demonstrate the performance of the proposed method, four examples, concerning both mathematical and engineering problems, were selected. By benchmarking obtained results with literature findings, various surrogate models combined with the proposed method not only provide an accurate reliability evaluation while highly alleviating the computational burden, but also provides a satisfactory balance between accuracy and efficiency compared to the other reliability methods.

Spatial Pattern of Larix gmelini in a Spruce-fir Valley Forest of Xiaoxing'an Mountains, China

Jin, Guangze,Liu, Liang,Liu, Zhili,Kim, Ji-Hong Korean Society of Forest Science 2010 한국산림과학회지 Vol.99 No.5

On the basis of vegetation data in the 9.12 ha (380 m ${\times}$ 240 m) permanent sample plot of the spruce-fir valley forest in Liangshui National Reserve of Xiaoxing'an Mountains, the study was conducted to evaluate spatial distribution pattern and spatial association by using point pattern analysis for living and dead trees of Larix gmelini by DBH size class. The number of L. gmelini were counted as 59 living stems/ha (6.42 $m^2$/ha of basal area) and 34 dead stems/ha (2.86 $m^2$/ha of basal area). The distributional curve of diameter class exhibited bimodal shape. The analysis of spatial distribution patterns of all living larch stems noted the clumped distribution on the whole. The size of larch aggregates of dead stems was decreased as diameter class was increased. The distribution of dead stems became gradually randomized with decreased clumped size as the scale increased. Living stems and dead stems of the larch had positive spatial association at most of scales, illustrating that the occurrence of mortality of the larch tree was closely related to the distribution pattern of living larch trees.