Shear resistance performance of low elastic polymer microspheres used for conformance control treatment

Hongbin Yang,Shuo Shao,Tongyu Zhu,Chaocheng Zhao,Shuren Liu,Bobo Zhou,Xiaoyu Hou,Yang Zhang,Wanli Kang 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-

Low elastic polymer microsphere (L-EPM) has been proposed as a functional polymer microsphere theseyears. L-EMP has the excellent deformation ability in the porous medium due to the low storage modulus. Herein, one kind of L-EPM with storage modulus (G0) of 23.6 Pa was prepared by inverse suspensionpolymerization. The shear resistance of L-EPM was researched by using coreflooding experiment andhigh shear rate emulsifier. The conformance control behavior of L-EPM was investigated by using doubleparallel sandpackflooding experiment. The results showed that L-EPM was a kind of swollen particle gelwith three-dimensional net structure and contained amide, carboxyl, and sulfonate groups. Themechanism of water swelling property was mainly due to the formation of hydrogen bonds, hydrolysis ofhydrophilic groups and the diffusion caused by osmotic pressure difference. Compared with high elasticpolymer microspheres (H-EPM) and low elastic preformed particle gel (L-PPG), L-EPM had better shearresistance in the porous medium and the well casing perforation. In addition, the critical shear points ofL-EPM was proposed in this work. Due to the better shear resistance and deformation ability, theconformance control behavior of L-EPM showed that L-EPM was a promising conformance control agentin the heterogeneous reservoirs.

Harmonic Structure Features for Robust Speaker Diarization

Yu Zhou,Hongbin Suo,Junfeng Li,Yonghong Yan 한국전자통신연구원 2012 ETRI Journal Vol.34 No.4

In this paper, we present a new approach for speaker diarization. First, we use the prosodic information calculated on the original speech to resynthesize the new speech data utilizing the spectrum modeling technique. The resynthesized data is modeled with sinusoids based on pitch, vibration amplitude, and phase bias. Then, we use the resynthesized speech data to extract cepstral features and integrate them with the cepstral features from original speech for speaker diarization. At last, we show how the two streams of cepstral features can be combined to improve the robustness of speaker diarization. Experiments carried out on the standardized datasets (the US National Institute of Standards and Technology Rich Transcription 04-S multiple distant microphone conditions) show a significant improvement in diarization error rate compared to the system based on only the feature stream from original speech.

Performance Evaluation and Analysis of Multiple Scenarios of Big Data Stream Computing on Storm Platform

( Dawei Sun ),( Hongbin Yan ),( Shang Gao ),( Zhangbing Zhou ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.7

In big data era, fresh data grows rapidly every day. More than 30,000 gigabytes of data are created every second and the rate is accelerating. Many organizations rely heavily on real time streaming, while big data stream computing helps them spot opportunities and risks from real time big data. Storm, one of the most common online stream computing platforms, has been used for big data stream computing, with response time ranging from milliseconds to sub-seconds. The performance of Storm plays a crucial role in different application scenarios, however, few studies were conducted to evaluate the performance of Storm. In this paper, we investigate the performance of Storm under different application scenarios. Our experimental results show that throughput and latency of Storm are greatly affected by the number of instances of each vertex in task topology, and the number of available resources in data center. The fault-tolerant mechanism of Storm works well in most big data stream computing environments. As a result, it is suggested that a dynamic topology, an elastic scheduling framework, and a memory based fault-tolerant mechanism are necessary for providing high throughput and low latency services on Storm platform.

MicroRNA-5582-3p alleviates the progression of osteosarcoma via targeting FZD4

Qu Wanming,Zhou Hongbin 대한독성 유전단백체 학회 2023 Molecular & cellular toxicology Vol.19 No.2

Background Dysfunction of microRNAs (miRNAs) is a common characteristic during cancer progression. The suppressive function of miR-5582-3p in cancers has been emerged in recent studies, however, the clinical value and novel targets of miR-5582-3p in osteosarcoma (OS) have not been identifi ed. Objective Investigate the function and underlying mechanism of miR-5582-3p in OS. Results miR-5582-3p expression was signifi cantly reduced in OS tissues and cells. Lower level of miR-5582-3p had closed relationship with the advanced development and poor 5-year overall survival of OS patients. Transfection of miR-5582-3p in OS cells obviously inhibited the cell proliferation, invasion and colony formation. Highly expressed miR-5582-3p also delayed the cell cycle progression and promoted cell apoptosis. Furthermore, FZD4 was validated as a target of miR-5582-3p. miR- 5582-3p interacted with the 3′-untranslated regions (3′-UTR) of FZD4 and reduced FZD4 expression in OS cells. Expression of miR-5582-3p was inversely correlated with that of FZD4 in OS tissues. Transfection of FZD4 rescued the suppressed OS cell proliferation, attenuated miR-5582-3p induced cell apoptosis and invasion. Conclusions Our fi ndings uncovered the novel anti-cancer potency of miR-5582-3p in OS via repressing FZD4, suggesting the possibility of miR-5582-3p as a therapeutic target of OS.

Three Dimensional Simulation of Viscoelastic Polymer Melts Flow in a Cast Film Process

Zheng, Hong,Yu, Wei,Zhou, Chixing,Zhang, Hongbin The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.1

Three-dimensional simulation of the cast film process for viscoelastic polymer materials was carried out using the finite element method. The flow between the extrusion die and chill roll was assumed to be steady-state and isothermal and the rheological property of material was characterized by a single-mode PTT model. Gravity and inertial flow were considered in the simulation work, but neglecting die swell at the die exit, surface tension, crystallization, transient disturbance and film sag. Simulation results of the cast film production line were compared with the experimental data on the velocity profiles and neck-in values. Neck-in and edge bead was well predicted and the influence of strain-hardening nature, elasticity of materials and operation conditions on the final film shape was also investigated. It was found that the effect of strain-hardening nature was masked for the material with a very low relaxation time when the single-mode PTT model was adopted. Greater elasticity helped to produce a film with smaller neck-in and less waste edge. When the air gap length was increased, it was predicted that neck-in phenomenon would be promoted as well. Moreover, it was found that ratio of neck-in values under different air gap lengths was approximately equal to that of air gap lengths, which was consistent with experimental evidence.

Finite Element Analysis of the Axial Mechanical Properties of Piezoelectric Actuator with Tubular Interdigitated Electrodes

Liu Yonggang,Wu Zhou,Wang Hongbin,Zhang Ting 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.10

We theoretically investigate a new type of piezoelectric actuator with tubular interdigitated electrodes. A partial model is adopted due to the axial symmetry of the actuator, which is divided into non-overlapping opposing electrode pairs on the center plane of the branch electrode. We present a finite element model of actuator and analyze its static-dynamic properties by using the commercially available finite element software ABAQUS. The length-to-diameter ratio of the tubular actuator can be as larger as necessary, so we are more concerned with the axial mechanical properties of the actuator. Thus we studied the influence of the electrode's shape and structure size on the clamping stress and free strain of the partial models. We also analyzed an ordinary piezoelectric model of the same size. We demonstrated that the partial model displayed significantly improved axial performance over the ordinary one. The axial stress of the partial model can reach 2.75 times that of the ordinary one, and the axial free strain can reach 1.55 times that of the ordinary one. According to the results of the static analysis, appropriate electrodes and structural parameters were selected to establish a tubular actuator model, with which modal and harmonic response analysis were performed. A modal analysis was used to obtain the frequencies and the shapes of the axial vibration. Each pair of electrodes is shunted to a sinusoidal varying voltage. Using the results of the harmonic response analysis, we obtained the actuator's axial resonance curve.

Study of nano-SiO2 reinforced CO2 foam for anti-gas channeling with a high temperature and high salinity reservoir

Wanli Kang,Haizhuang Jiang,Hongbin Yang,Zhe Li,Bobo Zhou,Yingqi He,Bauyrzhan Sarsenbekuly,Maratbek Gabdullin 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-

CO2 flooding has been widely applied in lots of low permeability reservoirs. After extensive CO2 injection,some reservoirs began to show serious gas channeling problems. CO2 foam had been successfully used tosolve gas channeling problems due to its advantages of water selective plugging features (not pluggingoil). In this paper, a novel CO2 foam system was developed for high temperature and high salinity(HTHS)(85 ℃, 60,000 mg/L) aiming at solving the gas channeling in Changqing Oilfield. Taking the foam half-lifeas the evaluation standard, the optimum foam system (0.5 wt% EC-1 + 1 wt% SiO2) for the target reservoirwas determined. The influences of temperature, salinity and pressure on the CO2 foam performance werestudied by high temperature and high pressure(HTHP)method. The ability and mechanism of anti-gaschanneling were studied by experiments of sand packed tube and microscopic displacement,respectively. The results showed that the foam system possessed good foam properties at HTHS withpressure. As the concentration of SiO2 nanoparticles increased, the resistance factor of the foam systemincreased. However, temperature showed an adverse effect on foam stability, the resistance factordecreased with the increase of temperature. The Jamin superposition and emulsion plugging mechanismof foam system was revealed by microscopic displacement experiments.

Design and Synthesis of Acid-resistant Zeolite T/NaY Composite Membrane for Water/Ethanol Separation

Xiangbo Li,Zhihui Zhou,Liang Chen,Chunlong Kong,Hongbin Du 대한화학회 2019 Bulletin of the Korean Chemical Society Vol.40 No.6

The random distribution of zeolite T on the porous α-Al2O3 tube during growth greatly limits its application in the industry. In this study, the defective zeolite T layer is modified with zeolite NaY. A continuous and dense zeolite T/NaY composite membrane is obtained through characterization by scanning electron microscope and X-ray diffraction. The resulting composite membrane exhibits high selectivity and high permeation flux for 90?wt % ethanol/water solution at 75 °C. Water concentration in the permeation side of the as-synthesized zeolite T/NaY composite membrane is >99.9 wt %, whereas that of primary zeolite T layer is only 60.4 wt %. The water permeation flux of the composite membrane reaches 4.35?kg/m2/h1. The composite membrane displays good stability in acid solution when the pH of the solution is >5.

Parallel Gene Loss and Acquisition Among Strains of Different Brucella Species and Biovars

Zhijun Zhong,Yufei Wang,Jie Xu,Yanfen Chen,Yuehua Ke,Xiaoyan Zhou,Xitong Yuan,Dongsheng Zhou,Yi Yang,Ruifu Yang,Guangneng Peng,Hai Jiang,Jing Yuan,Hongbin Song,Buyun Cui,Liuyu Huang,Zeliang Chen 한국미생물학회 2012 The journal of microbiology Vol.50 No.4

The genus Brucella is divided into six species; of these, B. melitensis and B. abortus are pathogenic to humans, and B. ovis and B. neotomae are nonpathogenic to humans. The definition of gene loss and acquisition is essential for understanding Brucella’s ecology, evolutionary history, and host relationships. A DNA microarray containing unique genes of B. melitensis Type strain 16MT and B. abortus 9-941 was constructed and used to determine the gene contents of the representative strains of Brucella. Phylogenetic relationships were inferred from sequences of housekeeping genes. Gene loss and acquisition of different Brucella species were inferred. A total of 214 genes were found to be differentially distributed,and 173 of them were clustered into 15 genomic islands (GIs). Evidence of horizontal gene transfer was observed for 10GIs. Phylogenetic analysis indicated that the 19 strains formed five clades, and some of the GIs had been lost or acquired independently among the different lineages. The derivation of Brucella lineages is concomitant with the parallel loss or acquisition of GIs, indicating a complex interaction between various Brucella species and hosts.

Ultrathin Two-Dimensional Atomic Crystals as Stable Interfacial Layer for Improvement of Lithium Metal Anode

Yan, Kai,Lee, Hyun-Wook,Gao, Teng,Zheng, Guangyuan,Yao, Hongbin,Wang, Haotian,Lu, Zhenda,Zhou, Yu,Liang, Zheng,Liu, Zhongfan,Chu, Steven,Cui, Yi American Chemical Society 2014 NANO LETTERS Vol.14 No.10

<P>Stable cycling of lithium metal anode is challenging due to the dendritic lithium formation and high chemical reactivity of lithium with electrolyte and nearly all the materials. Here, we demonstrate a promising novel electrode design by growing two-dimensional (2D) atomic crystal layers including hexagonal boron nitride (h-BN) and graphene directly on Cu metal current collectors. Lithium ions were able to penetrate through the point and line defects of the 2D layers during the electrochemical deposition, leading to sandwiched lithium metal between ultrathin 2D layers and Cu. The 2D layers afford an excellent interfacial protection of Li metal due to their remarkable chemical stability as well as mechanical strength and flexibility, resulting from the strong intralayer bonds and ultrathin thickness. Smooth Li metal deposition without dendritic and mossy Li formation was realized. We showed stable cycling over 50 cycles with Coulombic efficiency ∼97% in organic carbonate electrolyte with current density and areal capacity up to the practical value of 2.0 mA/cm<SUP>2</SUP>and 5.0 mAh/cm<SUP>2</SUP>, respectively, which is a significant improvement over the unprotected electrodes in the same electrolyte.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-10/nl503125u/production/images/medium/nl-2014-03125u_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl503125u'>ACS Electronic Supporting Info</A></P>