Power Control with Nearest Neighbor Nodes Distribution for Coexisting Wireless Body Area Network Based on Stochastic Geometry

( Ruixia Liu ),( Yinglong Wang ),( Minglei Shu ),( Huiqi Zhao ),( Changfang Chen ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.11

The coexisting wireless body area networks (WBAN) is a very challenging issue because of strong inter-networks interference, which seriously affects energy consumption and spectrum utilization ratio. In this paper, we study a power control strategy with nearest neighbor nodes distribution for coexistingWBAN based on stochastic geometry. Using homogeneous Poisson point processes (PPP) model, the relationship between the transmission power and the networks distribution is analytically derived to reduce interference to other devices. The goal of this paper is to increase the transmission success probability and throughput through power control strategy. In addition, we evaluate the area spectral efficiency simultaneously active WBAN in the same channel. Finally, extensive simulations are conducted to evaluate the power control algorithm.

Vanadium phosphorus oxide catalyst: Progress, development and applications

Muhammad Faizan,Ruirui Zhang,Ruixia Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-

With the increasing awareness of carbon neutrality, the global warming issue has been well addressed forthe reduction of carbon emissions into the atmosphere. Enormous amounts of carbonaceous gaseousbyproducts have already been released into the atmosphere especially after the start of industrial revolutionin the last century. Most industrial processes releases low carbon alkanes directly into the environment. Among them petroleum refinery units generate low carbon alkanes especially n-butane as gaseousbyproducts. In recent decades, n-butane has been used as a reagent to generate important valuable chemicalssuch as maleic anhydride with the support of vanadia catalysts. The complex vanadium phosphorusoxide exists in the nature in almost fifteen different phases. Each one has distinguished structural morphologyand chemical composition, and exhibits particular physiochemical characteristics such as surfaceacidity, lattice oxygen, surface oxygen, valance state, P/V ratio, V+4/V+5, surface to lattice oxygen ratio,etc., which are highly dependent on the precursor preparation and catalyst activation conditions. Researchers believed that either the addition of various promoters/cocatalysts/metals-dopants, or introducingnew preparation techniques such as microwave irradiation, ultrasound, ball milling, barothermal,calcination, sol–gel method electrospinning, hydrothermal and solvothermal synthesis can be used forthe improvement of the catalytic selectivity and activity. Aforementioned different aspects are describedin the current review along with the description of reaction kinetics and reaction mechanism. Additionally, we have also highlighted the important industrial issues such as air/n-butane pretreatment,deactivation, water supplement, phosphorus supplement, and the strong exothermic reaction, which areinfluencing the overall catalytic performance.

Virtual-point-based Asymptotic Tracking Control of 4WS Vehicles

Changfang Chen,Minglei Shu,Ruixia Liu 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.2

This paper studies the lateral and longitudinal path tracking control of four-wheel steering vehicles. By the introduction of virtual points, a robust and adaptive path tracking control strategy is proposed to simultaneously counteract modeling uncertainties, unexpected disturbances, and coupling effects. An adaptive model-based feedforward adaptive term and the robust integral of the sign of the error (RISE) feedback term can be used to yield an asymptotic tracking result, which improve the tracking performance and reduce the control effort. The stability of closed-loop system is analyzed using a Lyapunov-based method. Simulation results are provided to demonstrate the performance of the proposed controller under different driving conditions.

Impact of variations in fatty liver on sonographic detection of focal hepatic lesions originally identified by CT

Size Wu,Rong Tu,Ruixia Nan,Guangqing Liu,Xiaojing Cui,Xian Liang 대한초음파의학회 2016 ULTRASONOGRAPHY Vol.35 No.1

Purpose: The aim of this study was to investigate the influence of variations in fatty liver on the ultrasonographic detection of focal liver lesions. Methods: A total of 229 patients with varying degrees of fatty liver and focal liver lesions and 200 patients with focal liver lesions but no fatty liver were randomly selected for inclusion in groups I and II, respectively. Findings of focal liver lesions identified on computed tomography were taken as the reference, and findings on ultrasonography were compared with them. Results: The number of focal liver lesions in groups I and II were 501 and 413, respectively. The ultrasonographic detection rates of focal liver lesions in groups I and II were 86.8% (435/501) and 94.2% (389/413), respectively. Comparison of the detection of the focal lesions between patients with and without fatty liver or different grades of fatty liver were as follows: mild fatty liver (162/177) vs. liver without fat infiltration (389/413) (P=0.277); mild fatty liver (162/177) vs. moderate fatty liver (190/212) (P=0.604); mild fatty liver (162/177) vs. severe fatty liver (83/112) (P<0.001); moderate fatty liver (190/212) vs. liver without fat infiltration (389/413) (P=0.051); moderate fatty liver (190/212) vs. severe fatty liver (83/112) (P<0.001); severe fatty liver (83/112) vs. liver without fat infiltration (389/413) (P<0.001); and fatty liver (435/501) vs. liver without fat infiltration (389/413) (P<0.001). Conclusion: Mild and moderate fatty liver are not significantly associated with the visualization of the lesion, while severe fatty liver usually impairs the detection of focal lesions in the liver. If a patient with severe fatty liver is suspected to have a liver tumor, ultrasonography should only be chosen cautiously in case of a missed diagnosis.

Copper-based deep eutectic solvents (Cu-DES) assisted the VPO catalyst as a structural and electronic promoter for n-butane selective oxidation

Muhammad Faizan,Hao Li,Yumei Liu,Kexin Li,Shuang Wei,Ruirui Zhang,Ruixia Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-

Currently, deep eutectic solvents (DESs), as an exclusive class of ionic liquid analogs, are extensivelyemployed in various fields. Herein, vanadium phosphorus oxide (VPO) catalysts assisted by copperbaseddeep eutectic solvent (Cu-DES) as an electronic promoter and structure directing agent were ingeniouslysynthesized and exploited in the selective oxidation of n-butane to maleic anhydride (MA). TheDES is efficient, cost effective and highly green compared to conventionally use metal inorganic modifiers. Cu-DES was prepared from a eutectic mixture of an organic salt (ChCl) and a metal salt hydrate/metal salt of cupric (Cu(NO3)2.3H2O, CuCl2) and cuprous (CuCl) salt with a molar ratio of 1:1–1:3, whichnotably improved the catalytic performance compared to that of an unpromoted VPO catalyst. The MAselectivity and n-butane conversion of Cu–DES–VPO increased significantly, while the COx (CO andCO2) selectivity decreased. FTIR, DSC, XRD, SEM, EDS, TEM, Raman, TGA, XPS, and NH3-TPD characterizationtechniques were utilized to fully analyze the DES, precursor and catalyst to explore MA selectivity. This work shifts the significant increase of 13% n-butane conversion, 11% MA selectivity and 16% MAmass yield, which greatly influences low carbon alkane utilization. Importantly, the CO: CO2 ratio isreduced from 2.02 to 1.62, which is more beneficial for chemical plants as well as green environments.

Degradation Characteristics and Metabolic Pathway of 17β-estradiol (E2) by Rhodococcus sp. DS201

Qingmiao Yu,Ping Wang,Dongbo Liu,Ruixia Gao,Huanhuan Shao,Hongyan Zhao,Zhe Ma,Dan Wang,Hongliang Huo 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.6

In this study an E2-degrading bacterium was isolated from the activated sludge of a municipal treatment plant that treats the waste from a contraceptive medicineprocessing factory in Beijing, China. Using the observed morphological and physiological features of the bacterium and 16S rRNA sequence analysis, this bacterial strain was identified as Rhodococcus sp. DS201. Using single-factor experiments and orthogonal tests, it was demonstrated that, when strain DS210 bacteria were inoculated into MM medium at an initial concentration of 1 mg/L with an initial pH of 7 and an inoculum amount of 1%, complete degradation of E2 by this strain was achieved within 3 days at 30oC. After strain DS201 had degraded the E2, several E2 metabolites were detected in the culture extracts using high-performance liquid chromatography (HPLC); they were then further identified using HPLC with tandem mass spectrometry (LC-MS/MS). Mass spectrum analysis of the E2 degradation identified the following products: pent- 4-enoic acid; 2-ethyl-3-hydroxy-6-methylcyclohexane-1- carboxylic acid; 3-(7a-methyl-1,5-dioxooctahydro-1H-inden- 4-yl) propanoic acid; and 5-hydroxy-4-(3-hydroxypropyl)- 7a-methyloctahydro-1H-inden-1-one. These products have not previously been reported as parts of a mechanism for microbial E2 degradation and were suspected to be new metabolite products. Therefore, the E2 degradation pathway by strain DS201 is proposed herein.

Antioxidant capacity, flavor and physicochemical properties of FH06 functional beverage fermented by lactic acid bacteria: a promising method to improve antioxidant activity and flavor of plant functional beverage

Yan Xian-Tao,Zhang Ziqi,Wang Yubao,Zhang Wenmiao,Zhang Longfei,Liu Yang,Chen Dawei,Wang Wenqiong,Ma Wenlong,Qian Jian-Ya,Gu Ruixia 한국응용생명화학회 2023 Applied Biological Chemistry (Appl Biol Chem) Vol.66 No.-

The ability of natural plants to treat chronic diseases is closely related to their antioxidant function. Lactic acid bacteria (LAB) fermentation is an effective way to improve the nutritional value, biological activity and flavor of food. This study investigated the pH, titratable acidity, total polysaccharide, total flavone, total saponin, total polyphenol, and antioxidant activity of the FH06 beverage before and after probiotic fermentation. Results: After fermentation, FH06 had lower contents of total polysaccharides, total flavonoids, total saponins and total polyphenols but higher titratable acidity. The antioxidant activity was tested by total antioxidant capacity (FRAP method) and DPPH· scavenging ability. The FRAP value significantly increased after fermentation (P < 0.05), and the maximum increase was observed for Lactobacillus fermentum grx08 at 25.87%. For DPPH· scavenging ability, the value of all fermentations decreased, and L. fermentum grx08 had the smallest reduction at 2.21% (P < 0.05). The results of GC–MS and sensory analysis showed that fermentation eliminated bad flavors, such as grass, cassia and bitterness, and highlighted the fruit aroma and soft sour taste. Conclusion: The FRAP value and sensory flavor of FH06 fermentation by L. fermentum grx08 were significantly improved, indicating its great potential as a functional food with both strong antioxidant activity and good flavor.