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Empirical likelihood inference for semiparametric model with linear process errors
Guo-Liang Fan,Han-Ying Liang 한국통계학회 2010 Journal of the Korean Statistical Society Vol.39 No.1
The purpose of this article is to use the empirical likelihood method to study the confidence regions construction for the parameters of interest in semiparametric model with linear process errors under martingale difference. It is shown that the adjusted empirical loglikelihood ratio at the true parameters is asymptotically chi-squared. A simulation study indicates that the adjusted empirical likelihood works better than a normal approximationbased approach.
Estimation of Sensible Heat Flux using Thermal Infrared Data in the Arid Area
Guo,Xue-Liang,Chung,Yong-Seung 한국교원대학교 환경과학연구소 2000 환경연구논문집 Vol.- No.5
중국 서부의 사막과 오아시스 지역에서 eddy 상관 방법을 이용 현열 flux (H)와 지면의 열적외선 온도 (??) 관측을 수행하여 H와 ??-??(??2m 높이의 기온)의 관계를 정량화 하였다. 연구결과에 의하면, 오아시스와 사막지역의 불안정한 대기조건에서는 ??-??차이로부터 H를 계산 할 수 있는 간단한 관계가 이용될 수 있다. 풍속이 강할 때는 H와 ??-??관계가 풍속에 큰 영향을 받는다. 이에 관련된 풍속의 효과는 열적외선 자료를 이용하여 현열 flux의 정확한 산출에 활용될 수 있음이 제안되었다. The relationship between H and (??-??) (?? being the air temperature at 2 m) was established in this study from the measurements of eddy fluxes of sensible heat (H), and surface thermal infrared temperature (??) both in desert and oasis area of western China. Results show that under unstable condition a simple relationship can be used to estimate H from the difference(??-??) overoasis area and desert region. The relationship between H and(??-??) was greatly influenced when wind speed was high. The effect of wind speed on this relationship was suggested to consider in accurate estimation of sensible heat flux using thermal infrared data.
Tri-Axial Confining Numerical Test and Settlement Analysis of the Gravel Layer
Liang Zhang,Zhengwei Guo,Zheng Liang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.9
The discrete element method (DEM) is used according to the discreteness of the gravel layer to analysis the gravel particle. This paper presents simulations of tri-axial experiment tests and settlement of gravel layer. The stress-strain curves of gravel layer were analysed with different confining pressure through tri-axial numerical test, and the effect with different particle parameters and confining pressures was analysed. The numerical model of gravel layer after the excavation was established by the DEM to statistically analyse the settlement of gravel layer. The analyses results show that confining pressure corresponds to axial pressure that be destroyed of gravel particle model. The static friction coefficient has little effect on the failure of the tri-axial confining experimental model. The experiment model with various particle sizes need higher axial stress that be destroyed than the same particle size. During the collapse of the gravel stratum, the gravels are closer to the top of the hole which have a larger shift of settlement and a faster sedimentation rate. If the gravel are further away from top of the hole which have a smaller shift of settlement and slower sedimentation rate. The settlement of gravel causes the forces variation in all directions.
A new model and testing verification for evaluating the carbon efficiency of server
Liang Guo,Yue Wang,Yixing Zhang,Caihong Zhou,Kexin Xu,Shaopeng Wang 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.10
To cope with the risks of climate change and promote the realization of carbon peaking and carbon neutrality, this paper first comprehensively considers the policy background, technical trends and carbon reduction paths of energy conservation and emission reduction in data center server industry. Second, we propose a computing power carbon efficiency of data center server, and constructs the carbon emission per performance of server (CEPS) model. According to the model, this paper selects the mainstream data center servers for testing. The result shows that with the improvement of server performance, the total carbon emissions are rising. However, the speed of performance improvement is faster than that of carbon emission, hence the relative carbon emission per unit computing power shows a continuous decreasing trend. Moreover, there are some differences between different products, and it is calculated that the carbon emission per unit performance is 20-60KG when the service life of the server is five years.
Liang Sun,Fei Shang,Chang-Qing Duan,Guo-liang Yan 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.7
Transferring the recombinant S. cerevisiae T73-63 from 30 oC to 4 oC resulted in 41.4% increment of β-carotene concentration (3.96mg/g dry cell weight) relative to that of 30 oC, which was accompanied with the accumulation of fatty acid and ergosterol. The comparisons of the transcriptional levels of mevalonate pathway genes indicated that the expressions of HMG1, ERG9, ERG19, ERG20 and IDI1 at 4 oC were all higher than those of 30 oC, respectively. This suggested that increased transcriptions of mevalonate pathway genes contribute to the improvement of β-carotene production at low temperature. We also found that supplementation of 30mg/L triclosan, an inhibitor of fatty acid synthesis, led to further 28.3% enhancement of β-carotene concentration (4.94mg/g DCW), which was 18.8% higher than that of 30 oC with the same concentration of triclosan. The higher expressional levels of HMG, ERG19 and ERG20 and the simultaneous increment of ergosterol content (17.8%) suggested that more carbon source was transferred from fatty acid synthesis to mevalonate pathway under the circumstance of appropriately blocking fatty acid synthesis at low temperature (4 oC), which resulted in a higher increment of β-carotene production compared to that of 30 oC. The results of this study collectively suggest that the combination of reducing temperature and adding fatty acid synthesis inhibitors is a potential approach to improve the production of desirable isoprenoid compounds such as carotenoids.
Enhanced adsorption of Orange II on bagasse-derived biochar by direct addition of CTAB
Guo-Ting Liang,Huiyuan Li,Xiao Mi,Weigao Zhao 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.8
Surface charge properties of an adsorbent always play an important role for the removal of contaminants from water. A cationic surfactant hexadecyl tri-methyl ammonium bromide (CTAB) was involved into adsorptive removal of Orange II (ORII) by bagasse biochars to realize an in-situ modification and an enhanced adsorption capability. Adsorption capacity of biochar (BC600) improved significantly from 1.66mg/g in the absence of CTAB to 4.42mg/g in the presence of 2.0mg/L CTAB. A more hydrophobic surface of bagasse biochar was favorable for the dye uptake in the presence of CTAB. Linear pseudo-second-order kinetic model fitted the kinetics data better at three pH conditions than pseudo-first-order kinetic model, whether in the presence and absence of CTAB. Both nonlinear pseudo-first-order and pseudo-second-order kinetic models were suitable to describe the experimental data. The maximal adsorption capacity in the absence of CTAB was very limited (41.4mg/g), while the adsorption isotherm curve in the presence of CTAB was almost linear, indicating a strong adsorption capability due to the introduction of CTAB. Direct addition of CTAB into wastewater is a potential technique for the enhanced removal of negatively-charged pollutants by bagasse biochar.
Enhanced adsorptive performance of tetracycline antibiotics on lanthanum modified diatomite
Guo-Ting Liang,Yanmin Feng,Weiyong Zhu,Xiwang Zhang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.10
A natural mineral diatomite was modified with lanthanum species using an ion exchange process to improve its adsorption performance for tetracycline removal. The prepared lanthanum-modified diatomite was characterized by scanning electron microscopy, X-ray diffractometry and Fourier transform infrared spectroscopy. The results showed that lanthanum was successfully immobilized onto diatomite, with a content of lanthanum element of about 1.5% (atomic ratio). The prepared adsorbent was evaluated for the adsorptive removal of tetracycline, and the adsorption isotherm, kinetics and mechanism were investigated. The adsorbent exhibited higher adsorption capacity than other adsorbents reported in literature, reaching 1056.9mmol/kg. Langmuir model better fitted the experimental data than did other models. The removal of tetracycline was favorable at near neutral pH conditions. The tetracycline adsorption well followed pseudo-second-order kinetics model, and most of tetracycline was adsorbed within the initial 15 min. The increase in ionic strength reduced the tetracycline adsorptive removal, indicating that tetracycline adsorption on La-modified diatomite may be attributed to the formation of out-sphere surface complexes.
Guo-Liang Wang,Shaohong Qu,Zhengjie Yuan,Yu Zhang,Guojuan Xu,Dongling Bi,Haiyan Qu,Xiaowei Zou,Xiaoqing Gao,Haihe Yang,Haiyan He,Xuli Wang,Jiandong Bao,Shimin Zuo,Xuebiao Pan,Bo Zhou 한국식물학회 2018 Journal of Plant Biology Vol.61 No.3
Rice sheath blight (SB), caused by Rhizoctoniasolani (R. solani), is a major threat to rice productionworldwide. The molecular mechanisms of the SB resistancein rice are poorly understood. The transcriptomes of the SBresistantrice cultivar YSBR1 and the susceptible cultivarLemont were analyzed after R. solani infection. A total of7624 differentially expressed genes (DEGs) were identifiedat one or more timepoints in a cultivar. 5526 and 5618 DEGswere differentially expressed in Lemont and YSBR1,respectively. YSBR1 exhibited stronger and earlier transcriptionalresponse to R. solani than Lemont. Gene ontology enrichmentanalysis revealed that genes that encode cell wall-modifyingand glycosyl-degrading enzymes or anti-microbial proteinswere specifically induced in YSBR1 at 6 hpi. MapMananalysis revealed that more DEGs related with cell wall, β-glucanses, respiratory burst, phenylpropanoids and ligninwere highly induced by R. solani in YSBR1 than in Lemont. The results also showed that receptor-like kinases and jasmonicacid signaling may play important roles in host resistance toR. solani. This study highlights potential candidate genes andsignaling pathways involved in rice sheath resistance and canhelp to further clarify the mechanistic events underlyingresistance and susceptibility to R. solani.
The Apparent Digestibility of Corn By-products for Growing-finishing Pigs In vivo and In vitro
Guo, Liang,Piao, Xiangshu,Li, Defa,Li, Songyu Asian Australasian Association of Animal Productio 2004 Animal Bioscience Vol.17 No.3
Two trials in vivo and in vitro were conducted, in vivo to determine the apparent digestibility of gross energy, crude protein, dry matter, acid detergent fiber, neutral detergent fiber and apparent digestible energy in 10 corn by-products. In vivo the diets included one basal corn diet, four corn gluten meal diets, four corn distillers dried grains with solubles diets and two corn distillers dried grains diets using the different methods, 12 crossbred barrows weigh $40{\pm}$1.6 kg were allocated into individual metabolic crate, according to a $6{\times}6$ Latin square design. In vitro using flask technique, filter bag technique and dialysis tubing technique, the digestibilities of gross energy, crude protein and dry matter in corn gluten meal and corn distillers dried grains with solubles were investigated. Pepsin, pancreatin, intestinal fluid, rumen fluid and cellulase were used in incubation. The results showed that correlation coefficient was 0.73 in corn distillers dried grains with solubles between the digestibility of crude protein and acid detergent fiber in vivo (p<0.01); and correlation coefficient was 0.68 in corn distillers dried grains with solubles between the digestibility of gross energy and neutral detergent fiber in vivo (p<0.01). Apparent digestible energy (DE) of corn by-products in pig total tract was predicted by the percentage of crude protein (CP) and the content of gross energy (GE) in feedstuff. The equation: DE=5,601.09+26.69$\times$CP %-0.5904$\times$GE, ($R^2=0.72$). In vitro, filter bag technique was more convenient; furthermore, the digestibility for the treatments (pepsin+pancreatin+rumen fluid and pepsin+pancreatin+cellulase) was better.