Asymmetrical breakup and size distribution of droplets in a branching microfluidic T-junction

Pengcheng Ma,Taotao Fu,Chunying Zhu,Youguang Ma 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

The breakup and distribution of droplets at a branching T-junction were investigated experimentally by a high-speed camera. The effects of two-phase flow rates, two-phase Reynolds number and capillary number of the dispersed phase on droplet volume distribution were studied. The results indicated that the volume distribution ratio  decreases first and then increases with the increase of two-phase flow ratio Qd/Qc. Similarly, as the Reynolds number Rec of the continuous phase increases, the volume distribution ratio  also decreases at first and then increases. The increase of Reynolds number Red of the dispersed phase would lead to a reduction in the volume distribution ratio . Moreover, the increase of the capillary number Cad of dispersed phase could result in an increase in the volume distribution ratio . Correlations for predicting the volume distribution ratio were proposed, and the calculated results show good agreement with experimental data.

No Blind Spot: Network Coverage Enhancement Through Joint Cooperation and Frequency Reuse

Yi Zhong,Pengcheng Qiao,Wenyi Zhang,Fu-chun Zheng 한국통신학회 2016 Journal of communications and networks Vol.18 No.5

Both coordinated multi-point transmission and frequencyreuse are effective approaches to mitigate inter-cell interferenceand improve network coverage. The motivation of thiswork is to explore the manner to effectively utilize the spectrum resourceby reasonably combining cooperation and frequency reuse. The Mat´ern cluster process, which is appropriate to model networkswith hot spots, is used to model the spatial distributionof base stations. Two cooperative mechanisms, coherent and noncoherentjoint transmission (JT), are analyzed and compared. Wealso evaluate the effect of multiple antennas and imperfect channelstate information. The simulation reveals that the proposed approachto combine cooperation and frequency reuse is effective toimprove the network coverage for users located at both the centerand the boundary of the cooperative region.

An Energy Efficient Algorithm Based on Clustering Formulation and Scheduling for Proportional Fairness in Wireless Sensor Networks

( Yongbo Cheng ),( Xing You ),( Pengcheng Fu ),( Zemei Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.2

In this paper, we investigate the problem of achieving proportional fairness in hierarchical wireless sensor networks. Combining clustering formulation and scheduling, we maximize total bandwidth utility for proportional fairness while controlling the power consumption to a minimum value. This problem is decomposed into two sub-problems and solved in two stages, which are Clustering Formulation Stage and Scheduling Stage, respectively. The above algorithm, called CSPF_PC, runs in a network formulation sequence. In the Clustering Formulation Stage, we let the sensor nodes join to the cluster head nodes by adjusting transmit power in a greedy strategy; in the Scheduling Stage, the proportional fairness is achieved by scheduling the time-slot resource. Simulation results verify the superior performance of our algorithm over the compared algorithms on fairness index.

Long non-coding RNA RP11-6O2.4 indicates poor prognosis and suppresses cell cycle progression through the p38-MAPK signaling pathway in gastric cancer

Yang Feng,Zhiming Fu,Yajun Luo,Wang Tan,Zilin Liu,Pengcheng Ye,Fei Lu,Wanping Xiang,Linghan Tang,Lin Yao,Mengyun Song,Qingmei Huang,Yilun Liu,Jiangwei Xiao 대한독성 유전단백체 학회 2019 Molecular & cellular toxicology Vol.15 No.3

Backgrounds: The role of long non-coding RNAs (lncRNA) in gastric cancer (GC) has been highlighted in studies conducted over the past decade. However, the potential clinical value and the mechanisms of action of RP11-6O2.4 in GC have not been thoroughly elucidated to date. The specific aim of the present study was to assess RP11-6O2.4 and to explore its role in human GC. Methods: Quantitative real-time polymerase chain reaction (qPCR) was performed to analyze the expression levels of RP11-6O2.4 in GC tissues, paired adjacent noncancerous tissues (ANTs) and GC cell lines. In addition, the correlation between RP11-6O2.4 expression and the clinical characteristics and prognosis of patients with GC was statistically analyzed. The effects of RP11- 6O2.4 on the GC cell cycle transformation through the p38-MAPK signaling pathway were explored by flow cytometry, qPCR and Western blot analysis after treatment with SB203580, a p38MAPK specific inhibitor, in vitro. Results: The expression levels of RP11-6O2.4 in GC tissues were significantly lower than the paired ANTs (P<0.05). In addition, RP11-6O2.4 expression was significantly lower in cases with older age, longer maximum tumor diameter, higher ASA grade and deeper invasive depth (P<0.05). RP11-6O2.4 expression was significantly higher in cases with well/middle differentiation than poor/no differentiation; higher in cases without lymph node metastasis than in lymph node metastasis; and higher in cases in stage Ⅰ/Ⅱ than in stage Ⅲ/Ⅳ. An in vitro assay showed that RP11-6O2.4 induced G0/ G1 phase cell cycle arrest, likely by regulating the p38- MAPK signaling pathway. Conclusion: The above mentioned data suggested that RP11-6O2.4 was a tumor-suppressor gene in GC. RP11- 6O2.4 might play an important role in the cell cycle transformation by regulating the p38-MAPK signaling pathway, thereby representing a specific biomarker and a potential molecular target for the treatment of GC.

No Blind Spot: Network Coverage Enhancement Through Joint Cooperation and Frequency Reuse

Zhong, Yi,Qiao, Pengcheng,Zhang, Wenyi,Zheng, Fu-chun The Korea Institute of Information and Commucation 2016 Journal of communications and networks Vol.18 No.5

Both coordinated multi-point transmission and frequency reuse are effective approaches to mitigate inter-cell interference and improve network coverage. The motivation of this work is to explore the manner to effectively utilize the spectrum resource by reasonably combining cooperation and frequency reuse. The $Mat{\acute{e}}rn$ cluster process, which is appropriate to model networks with hot spots, is used to model the spatial distribution of base stations. Two cooperative mechanisms, coherent and non-coherent joint transmission (JT), are analyzed and compared. We also evaluate the effect of multiple antennas and imperfect channel state information. The simulation reveals that the proposed approach to combine cooperation and frequency reuse is effective to improve the network coverage for users located at both the center and the boundary of the cooperative region.

Implementation of SHM system for Hangzhou East Railway Station using a wireless sensor network

Yanbin Shen,Wenwei Fu,Yaozhi Luo,Chung Bang Yun,Dun Liu,Pengcheng Yang,Guang Yang,Guangen Zhou 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.1

Structural health monitoring (SHM) is facilitated by new technologies that involve wireless sensor networks (WSNs). The main benefits of WSNs are that they are distributed, are inexpensive to install, and manage data effectively via remote control. In this paper, a wireless SHM system for the steel structure of Hangzhou East Railway Station in China is developed, since the state of the structural life cycle is highly complicated and the accompanying internal force redistribution is not known. The monitoring system uses multitype sensors, which include stress, acceleration, wind load, and temperature sensors, as the measurement components for the structural features, construction procedure, and on-site environment. The sensor nodes communicate with each other via a flexible tree-type network. The system that consists of 323 sensors is designed for the structure, and the data acquisition process will continue throughout its whole life cycle. First, a full-scale application of SHM using a WSN is described in details. Then, it focuses on engineering practice and data analysis. The current customized WSN has been demonstrated to have satisfactory durability and strong robustness; hence, it well satisfies the requirements for multi-type sensors to operate in a large area. The data analysis results demonstrate that the effects of the construction process and the environment on the super-large-scale structure have been captured accurately. Those effects include the stress variation throughout the construction process, the dynamic responses that are caused by passing trains, the strain variation caused by temperature change over the long term, and the delay in the wind-pressure history.

CYCLIN-DEPENDENT KINASE8 Differentially Regulates Plant Immunity to Fungal Pathogens through Kinase-Dependent and -Independent Functions in <i>Arabidopsis</i>

Zhu, Yingfang,Schluttenhoffer, Craig M.,Wang, Pengcheng,Fu, Fuyou,Thimmapuram, Jyothi,Zhu, Jian-Kang,Lee, Sang Yeol,Yun, Dae-Jin,Mengiste, Tesfaye American Society of Plant Biologists 2014 The Plant cell Vol.26 No.10

<P>This work explores the intriguing roles of Mediator subunit CYCLIN-DEPENDENT KINASE8 (CDK8) in plant immune responses to fungal infection. CDK8 regulates jasmonate-responsive gene expression and cuticle development via interactions with MEDIATOR COMPLEX SUBUNIT25 and transcription factor WIN1, respectively, while other interactions suggest evolutionary conservation of the Mediator kinase module.</P><P>CYCLIN-DEPENDENT KINASE8 (CDK8) is a widely studied component of eukaryotic Mediator complexes. However, the biological and molecular functions of plant CDK8 are not well understood. Here, we provide evidence for regulatory functions of <I>Arabidopsis thaliana</I> CDK8 in defense and demonstrate its functional and molecular interactions with other Mediator and non-Mediator subunits. The <I>cdk8</I> mutant exhibits enhanced resistance to <I>Botrytis cinerea</I> but susceptibility to <I>Alternaria brassicicola</I>. The contributions of CDK8 to the transcriptional activation of defensin gene <I>PDF1.2</I> and its interaction with MEDIATOR COMPLEX SUBUNIT25 (MED25) implicate CDK8 in jasmonate-mediated defense. Moreover, CDK8 associates with the promoter of <I>AGMATINE COUMAROYLTRANSFERASE</I> to promote its transcription and regulate the biosynthesis of the defense-active secondary metabolites hydroxycinnamic acid amides. CDK8 also interacts with the transcription factor WAX INDUCER1, implying its additional role in cuticle development. In addition, overlapping functions of CDK8 with MED12 and MED13 and interactions between CDK8 and C-type cyclins suggest the conserved configuration of the plant Mediator kinase module. In summary, while CDK8’s positive transcriptional regulation of target genes and its phosphorylation activities underpin its defense functions, the impaired defense responses in the mutant are masked by its altered cuticle, resulting in specific resistance to <I>B. cinerea</I>.</P>

Algal extracts based biogenic synthesis of reduced graphene oxides (rGO) with enhanced heavy metals adsorption capability

Shahbaz Ahmad,Aftab Ahmad,Sikandar Khan,Shujaat Ahmad,Idrees Khan,Shah Zada,Pengcheng Fu 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.72 No.-

Efficient reduction of GO was performed, using cellular extracts of three algal strains. The rGO werecharacterized by SEM, TEM, UV-Visible spectroscopy, XRD, FTIR, Raman spectroscopy, Zeta potential andredox potentials. The rGO were then used as decontaminating agents for heavy metals (Cu and Pb), inwaste water. GO reduced via JSC-1 have removed up to 93% Cu and 82% Pb (adsorption capacity of93 mg g 1 and 82 mg g 1, respectively), by 211-9a have removed 74% (74 mg g 1) Cu and 89% (89 mg g 1)Pb, while by 211-11n have adsorbed 91% (91 mg g 1) Cu and 95% Pb (95 mg g 1), within 30 min.

Microalgal and cyanobacterial strains used for the bio sorption of copper ions from soil and wastewater and their relative study

Shah Zada,Saleem Raza,Sikandar Khan,Arshad Iqbal,Zhang Kai,Aftab Ahmad,Midrar Ullah,Mohib Kakar,Pengcheng Fu,Haifeng Dong,Zhang Xueji 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-

Heavy metals and other organic pollutants are the hazardous materials causing soil and water pollution,hence, bioremediation of these components is a matter of concern for environmental biotechnologists. Twenty one microalgal and cyanobacterial strains were evaluated for removal of copper from aqueoussolutions and soil containing 10 ppm copper. 5 out of 21 strains have shown comparatively higher toleranceto copper stress. The biosorption capabilities of all the five strains were assessed using techniqueslike ultraviolet (UV) spectrophotometers, scanning electron microscope (SEM), inductively coupledplasma mass spectrometry (ICP-MS), and confocal Microscopy. It was found that the five selected strainscould grow normally upon incubating with 20 ppm of Cu. Copper removal efficiencies of these microalgae(S. obliquus, A. braunii, C. fusca, L. JSC-1 and C. saccharophila in water were 99.9, 99.3, 97, 96.7, and 96%,while for soil was 73, 75, 71, 70, 68%, respectively. A minor leakage of nucleic acid and protein weredetected with time. Furthermore, no any visible morphological changes were observed after six daysof treatment, while minor changes were noticed after 12 days in water, and severe morphological deformationsoccurred after 24 days of bioremediation in soil. Our findings reveal that the selected microalgalstrains have high potential for Cu bioremediation at certain concentration for 12 days exposure fromwater and 24 from soil.