Relative viscosity of bimodal suspensions

Fuzhong Qi,Roger I. Tanner 한국유변학회 2011 Korea-Australia rheology journal Vol.23 No.2

A new differential (or multi-scale, mean field approach) model for the relative viscosity of bimodal suspensions is discussed in this paper. Solid spherical particles with a bimodal size distribution in a Newtonian solvent are considered. The problem of random close packing for a bidisperse system is studied. The bounds on volume fractions are given by 0.639<φ_(bm)<0.869, where the random close packing volume fraction for a monodisperse system, φ_(rcp)=0.639, is assumed. We propose that the bimodal suspension has a dominant large particle composition and that the small particles fill the empty spaces between the large particles. The model can therefore be based on the theory of monodisperse suspensions. The predictions of the relative viscosity for several bimodal suspensions given by the model are compared to experimental measurements. A reasonably good agreement is observed.

Relative viscosity of bimodal suspensions

Qi, Fuzhong,Tanner, Roger I. 한국유변학회 2011 Korea-Australia rheology journal Vol.23 No.2

A new differential (or multi-scale, mean field approach) model for the relative viscosity of bimodal suspensions is discussed in this paper. Solid spherical particles with a bimodal size distribution in a Newtonian solvent are considered. The problem of random close packing for a bidisperse system is studied. The bounds on volume fractions are given by o.639 < ${\varphi}_{bm}$ < 0.869, where the random close packing volume fraction for a monodisperse system, ${\varphi}_{rcp}$ = 0.639, is assumed. We propose that the bimodal suspension has a dominant large particle composition and that the small particles fill the empty spaces between the large particles. The model can therefore be based on the theory of monodisperse suspensions. The predictions of the relative viscosity for several bimodal suspensions given by the model are compared to experimental measurements. A reasonably good agreement is observed.

A phenomenological approach to suspensions with viscoelastic matrices

Tanner Roger I.,Qi Fuzhong The Korean Society of Rheology 2005 Korea-Australia rheology journal Vol.17 No.4

A simple constitutive model for viscoelastic suspensions is discussed in this paper. The model can be used to predict the rheological properties (relative viscosity and all stresses) for viscoelastic suspensions in shear and elongational flow, and the constitutive equations combine a 'viscoelastic' behaviour component and a 'Newtonian' behaviour component. As expected, the model gives a prediction of positive first normal stress difference and negative second normal stress difference; the dimensionless first normal stress difference strongly depends on the shear rate and decreases with the volume fraction of solid phase, but the dimensionless second normal stress difference (in magnitude) is nearly independent of the shear rate and increases with the volume fraction. The relative viscosities and all the stresses have been tested against available experimental measurements.

Ordered Structures in Al-3Cu-(1.78Mg) Alloys Aged at 190 °C for 2 Minutes

Wei Haigen,Xia Fuzhong,Jia Yanlin,Wang Mingpu 대한금속·재료학회 2016 METALS AND MATERIALS International Vol.22 No.4

Precipitate structures in Al-3Cu (wt%) and Al-3Cu-1.78Mg (wt%) alloys aged at 190 °C for 2 minutes were studied by transmission electron microscopy and high resolution transmission electron microscopy. New models named ordered structures were proposed for the fine precipitates formed in the two aged alloys. Ordered structures in Al-Cu alloys were composed by Al and Cu atoms, and by Al, Cu and Mg atoms together in Al-Cu-Mg alloys. By simulating selected area electron diffraction (SAED) patterns of Al-Cu-(Mg) alloys containing plate-shaped ordered structures and taking into account the influence of the plate shape of ordered structures on their electron diffraction characteristics, [001] zone axis SAED patterns of the two alloys were interpreted. It was concluded that volume expansions of the two aged alloys occurring at the early aging stage are caused by the lattice expansions as ordered structures are formed, and ordered structures are the nuclei for the GP zones in Al-Cu alloys.

A phenomenological approach to suspensions with viscoelastic matrices

Roger I. Tanner,Fuzhong Qi 한국유변학회 2005 Korea-Australia rheology journal Vol.17 No.4

A simple constitutive model for viscoelastic suspensions is discussed in this paper. The model can be used to predict the rheological properties (relative viscosity and all stresses) for viscoelastic suspensions in shear and elongational flow, and the constitutive equations combine a viscoelastic behaviour component and a Newtonian behaviour component. As expected, the model gives a prediction of positive first normal stress difference and negative second normal stress difference; the dimensionless first normal stress difference strongly depends on the shear rate and decreases with the volume fraction of solid phase, but the dimensionless second normal stress difference (in magnitude) is nearly independent of the shear rate and increases with the volume fraction. The relative viscosities and all the stresses have been tested against available experimental measurements.

A Face Detection Algorithm Based on Deep Learning

Ming Li,Chengyang Yu,Fuzhong Nian,Xiaoxu Li 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.11

One-pot Synthesis of Hierarchical Mesoporous ZSM-5 from the Assembly of Nanocrystals Using Urea as Additive

Yuanyuan Ma,Zhifang Li,Nan Zhao,Fuzhong Han,Qiubin Kan 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.03

A hierarchical mesoporous ZSM-5 catalyst with aggregated nanocrystals structure was one-pot hydrothermally synthesized by using urea as the additive. The crystalline phase, morphology and hierarchical architectures were characterized by the XRD, SEM, TEM and N2 adsorption/desorption analyses. The nano-aggregates showed MFI crystalline phase and were composed of connected nanoparticles. The samples had the high surface area and the pore volume from intercrystalline among the nanoparticles due to spontaneously stacking of nanocrystals. The pyridine-adsorbed FTIR and the catalytic performances in the alkylation of phenol and tert-butyl alcohol were applied to evaluate the accessibility of acid sites and the catalytic activities for the hierarchical mesoporous ZSM-5 samples. The samples possessed high accessibility of acid sites which resulted from their large amount of mesopores, and its catalytic activity was improved dramatically. The phenol conversion could reach up to 95.6%, and the corresponding selectivity of 4-TBP and 2,4-DTBP was 44% and 51.5%, respectively.

Effects of Sperm Pretreatments and In vitro Culture Systems on Development of In vitro Fertilized Embryos Derived from Prepubertal Boer Goat Oocytes in China

Lv, Lihua,Yue, Wenbin,Liu, Wenzhong,Ren, Youshe,Li, Fuzhong,Lee, Kyung-Bon,Smith, George W. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.7

Use of oocytes from prepubertal animals for in vitro embryo production holds potential application for reducing generation intervals and increasing genetic progress through embryo transfer. The objective of these studies was to compare the effect of three sperm pretreatments (prior to in vitro fertilization) and seven embryo culture protocols on fertilization rate and (or) subsequent development of in vitro fertilized embryos derived from oocytes harvested from ovaries of 1-6 month old prepubertal Boer goats in China. Cleavage rates were highest for embryos fertilized with heparin-treated versus calcium ionophore- or caffeine-treated sperm. Similar rates of blastocyst development were observed using heparin- and ionophore-treated sperm, which were higher than obtained with caffeine-treated sperm. No differences in cleavage or blastocyst rates were observed following embryo culture in basal medias (synthetic oviductal fluid (SOF), Charles Rosenkrans 1 (CR1) or tissue culture medium-199 (TCM-199)) containing 10% fetal bovine serum (FBS). Cumulus or oviductal cell co-culture did not enhance cleavage or blastocyst rates relative to culture in SOF+10% FBS. Replacement of FBS in SOF medium with 0.3% BSA increased cleavage rates, but did not increase rates of blastocyst development. Sequential culture in SOF+0.3% BSA followed by SOF+10% FBS increased blastocyst yield versus continuous culture in SOF+10% FBS and tended to increase blastocyst yield versus continuous culture in SOF+0.3% BSA. These results demonstrate a pronounced effects of sperm pretreatments and in vitro embryo culture systems on rates of blastocyst development and provide a potential protocol (sperm pretreatment with heparin and sequential embryo culture in SOF+0.3% BSA followed by SOF+10% FBS) for generation of the significant numbers of in vitro produced blastocysts from oocytes of prepubertal Boer goats necessary for application of embryo transfer in rural regions of China for distribution of Boer goat genetics.

Protein profiling predicts the response to anthracycline and taxanes based neo-adjuvant chemotherapy in breast cancer

Shu Wang,Houpu Yang,Jiajia Guo,Miao Liu,Fuzhong Tong,Yingming Cao,Bo Zhou,Peng Liu,Lin Cheng,Fei Xie,Deqi Yang,Jiaqing Zhang 한국바이오칩학회 2011 BioChip Journal Vol.5 No.1

Neo-adjuvant chemotherapy for breast cancer substantially benefits patients who achieve pathological response. However, clinical or pathological response information can only be obtained a period of time after chemotherapy. The identification of novel bio-markers or the application of new technique that can be used to predict treatment response before che-motherapy would allow therapy to be tailored on an individual patient basis. The purpose of this study is to identify the chemo-sensitivity and chemo-resistance related proteins using antibody microarray profiling, and to develop a multi-protein predictive model for breast cancer. Total protein was extracted from core needle biopsy samples obtained from 15 patients before treatment with neo-adjuvant TA(combination of taxanes and anthracycline) chemotherapy. Protein profiling was analyzed by antibody microarray. 10 pati-ents were used as training set to develop the predictive model using the software PAM(prediction analysis of microarray). Another 5 patients were used as a validation set to test the model. In cross-validation, the mole-cular predictive model showed an accuracy of 90%, in independent validation, the model classified the cases with an accuracy of 80%. In conclusion, the proteomic predictive model has the potential to predict pathological response to neo-adjuvant TA chemotherapy.

KGd(MoO4)2:Eu3+ as a promising red phosphor for light-emitting diode application

Linghong Yi,Liya Zhou,Zhengliang Wang,Jianhua Sun,Fuzhong Gong,Weiping Wan,Wei Wang 한국물리학회 2010 Current Applied Physics Vol.10 No.1

A red phosphor KGd(MoO4)2:Eu3+ was prepared by solid-state reaction technique at high temperature. Its photoluminescent property was investigated and the optimum concentration of Eu3+ doped in the KGd(MoO4)2 is 25 mol%. Compared with Y2O2S:0.05Eu3+, the obtained KGd(MoO4)2:Eu3+ shows wider excitation band around 400 nm, higher intensity of Eu3+ 5D0.7F2 emission upon excitation 393 nm, and the CIE chromaticity coordinates (x = 0.655, y = 0.345) are closer to the standard of National Television Standard Committee (NTSC). The optical properties of KGd(MoO4)2:Eu3+ suggest that it is an efficient red-emitting phosphor for light-emitting diode applications.