Stability, Fairness, and Performance: A Flow-Level Study on Nonconvex and Time-Varying Rate Regions

Jiaping Liu,Proutiere, A.,Yung Yi,Mung Chiang,Poor, H.V. IEEE 2009 IEEE transactions on information theory Vol.55 No.8

<P>The flow-level stability and performance of data networks with utility-maximizing allocations are studied in this paper. Similarly to prior works on flow-level models, exogenous data arrivals with finite workloads are considered. However, to model many realistic situations, the rate region, which constrains the feasibility of resource allocation, may be either nonconvex or time-varying. When the rate region is fixed but nonconvex, sufficient and necessary conditions are characterized for stability for a class of <I>alpha</I>-fair allocation policies, which coincide when the set of allocated rate vectors have continuous contours. When the rate region is time-varying according to a Markovian stationary and ergodic process, the precise stability region is obtained. In both cases, the size of the stability region depends on the resource allocation policy, in particular, on the fairness parameter <I>alpha</I> in <I>alpha</I>-fair utility maximization. This is in sharp contrast with the substantial existing literature on stability under fixed and convex rate regions, in which the stability region coincides with the rate region for many utility-based resource allocation schemes, independent of the value of the fairness parameter. It is further shown that for networks which consist of flows from two different classes under <I>alpha</I>-fair allocations, there exists a tradeoff between the stability region and the fairness parameter <I>alpha</I>. Moreover, the impact of this fairness-stability tradeoff on the system performance, e.g., average throughput and mean flow response time, is studied, and numerical experiments that illustrate the new stability region and the performance versus fairness tradeoff are presented.</P>

Predicting the Compression Index of Saturated Reconstituted Contaminated Clays Using Index Properties

Ridong Fan,Jiaping Liu,Songyu Liu,Yanjun Du,Martin Liu,Sunan You 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9

An empirical equation was proposed to predict compression index (Cc) of saturated reconstituted contaminated clays. Experimental data from 464 oedometer tests from literature were analyzed, aiding to develop a method for predicting the Cc of saturated reconstituted contaminated clays. The predictive capacity of three existing empirical equations of Cc with either liquid limit (wL), plasticity index (PI) or initial porosity (n0) was assessed. It was found that these equations previously used for clean soils roughly predict the Cc value of saturated reconstituted contaminated clays. To better predict the Cc, a series of empirical equations were established by regression analysis of the experimental data. Finally, the “best” equation was determined by an assessment of goodness of fit.

Manganese single-atom nanostructures for highly efficient tumor therapy

Jiaping Pei,Hui Dou,Chencai Liu,Tushuai Li 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-

The single-atom attracts growing interests in various fields and provides a new strategy for tumor therapyby inspiring chemodynamic-photothermal therapy (CPT) effects owing to its excellent catalytic properties. We synthesize the Folic acid@single atomic manganese (Mn) nanoparticles (FA@SAMn NPs) withmesoporous carbon sphere structure by the coordination aided polymerization assembly method. Antitumor therapeutic effect studies were carried out in vitro and in vivo. This hierarchical nanostructurepossesses a high surface area, large pore, and rich N that provide higher catalytic activity, and it also exhibitsexcellent activity and stability in the oxygen reduction reaction. With its accumulation in the specifictumor microenvironment, the FA@SAMn NPs could generate reactive oxygen species (ROS), which wouldmediate a series of 4 T1 cell damage and inhibit tumor propagation (56% mortality rate). Moreover, theFA@SAMn NPs possess an excellent photothermal effect under near infrared-II (NIR-II) laser irradiation. This leads to a local hyperthermia situation in the tumor area and contributes to tumor inhibition (91%mortality rate). In sum, FA@SAMn catalysts effectively suppressed tumor growth and significantlyincreased the survival time. This work aims to provide new potential single-atom-coordinated carbonnetworks that possess efficient biocatalytic sites and photothermal effects, inspiring a series of advancesin ROS and photothermal-related biological applications across broad biomedical fields.

Study on Measurement Technology and Influencing Factors of Atmospheric Salt Fog Concentration at the Seaside – A Case Study of Sanya, China

Zhimiao Zheng,Jingchao Xie,Pan Liang,Jiaping Liu 한국기상학회 2023 Asia-Pacific Journal of Atmospheric Sciences Vol.59 No.3

Corrosion of reinforced concrete in the high-salt atmospheric environment of coastal areas widely exists in practical coastalprojects, which will reduce the durability of coastal buildings and metal equipment. In this study, the factors influencingcoastal atmospheric salt fog concentration were studied by combining theoretical analysis and coastal measurements. First,a set of atmospheric sampling and processing methods for atmospheric salt fog particles was summarized and sorted. Through actual measurements in Sanya, the atmospheric sampling and processing method were verified, and more accuratecoastal atmospheric salt fog concentration data were obtained. The average atmospheric salt fog concentration at the coastwas 190 μg/m3, the maximum value was 343.18 μg/m3, and the minimum value was 48.49 μg/m3. Then, the influence ofmeteorological factors, such as temperature, humidity, and wind speed, on salt fog concentration was explored based on themeasured data, and the functional relationship between various factors and salt fog concentration was fitted. Finally, a modelof salt fog particles migrating inland driven by wind in the coastal atmosphere was deduced theoretically and verified by themeasured data of atmospheric salt fog concentration at different sea distances. The results of this study provide a theoreticalreference for the anti-corrosion properties of coastal buildings and metal equipment.

The Use of Toluidine Blue Staining Combined with Paraffin Sectioning and the Optimization of Freeze-thaw Counting Methods for Analysing Root-Knot Nematodes in Tomato

Xiaoman Li,Wenchao Zhao,Xiaoxuan Zhou,Jiaping Feng,Yingjian Gao,Xuehui Yao,Yang Liu,Jie Liu,Rui Yang,Fukuan Zhao,Shaohui Wang 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.6

Root-knot nematodes (RKNs) (Meloidogyne spp.) are one of the most damaging crop pests and cause severeyield losses worldwide. Easier and more efficient methods are needed for assessing nematode infestations and hostplant resistance. In the present study, we combined toluidine blue staining and paraffin sectioning to observe theestablishment of giant cells (GCs; redifferentiated cells induced by nematode feeding) and the developmental status ofRKNs in tomato (Solanum lycopersicum). The number of RKNs was counted using a modified freeze-thaw countingmethod. Finally, three tomato lines with different levels of RKN resistance, but otherwise identical genetic backgrounds,were tested to verify the applicability of the combined method. The results suggested that using toluidine blue stainingcombined with paraffin sectioning and freeze-thaw counting accurately reflects the level of RKN resistance of tomato plants.

Influence of synergistic effect of phosphate on corrosion resistance of self-assembled superhydrophobic composite film on 6061 aluminum alloy surfaces

Likui Wang,Shichen Lu,Feng Xie,Hanyu Liu,Jiaping Li,Wei Shang,Zhe Zhang,Yuqing Wen 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.128 No.-

Aluminum (Al) alloys are used in a wide range of applications due to their advantages. However, theexisting corrosion protection methods have insufficient protection ability and cannot achieve longtermprotection. In this paper, reactive protective film on the surface of aluminum alloys using 1-hydroxyethyl-1,1-diphosphonic acid (HEDP) molecules. Then, Lauric acid/Graphene (LA/rGO) film is usedto prepared on the surface of HEDP film. SEM, XRD, EDS, Raman, XPS and WCA were conducted to analyzephysical and chemical features of coatings. The total resistance of the film reaches 1.0 1020 Xcm2, in asalt spray test using 5wt% NaCl as the corrosion medium, corrosion spots appeared on day 28 with a corrosioninhibition efficiency of 99.99%. Theoretical studies with quantum chemical calculations haveshown that HEDP/LA/rGO composite films can be adsorbed on Al alloy surfaces through P-O-Al and PO-C chemical bonding. The influence of phosphate synergistic effect on the corrosion resistance of theself-assembled superhydrophobic composite film on the surface of 6061 aluminum alloy is discussed. This study presents a scientific and innovative design concept to develop coatings with excellent corrosionprotection for aluminum alloy, and then extend their application to certain areas.