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Hierarchical modeling of stochastic manufacturing and service systems

Zhe George ZHANG, Xiaoling YIN

Frontiers of Engineering Management 2017, Volume 4, Issue 3,   Pages 295-303 doi: 10.15302/J-FEM-2017047

Abstract: This paper presents a review of methodologies for analyzing stochastic manufacturing and service systems. On the basis of the scale and level of details of operations, we can study stochastic systems using micro-, meso-, and macro-scopic models. Such a classification unifies stochastic modeling theory. For each model type, we highlight the advantages and disadvantages and the applicable situations. Micro-scopic models are based on quasi-birth-and-death process because of the phase-type distributed service times and/or Markov arrival processes. Such models are appropriate for modeling the detailed operations of a manufacturing system with relatively small number of servers (production facilities). By contrast, meso-scopic and macro-scopic models are based on the functional central limit theorem (FCLT) and functional strong law of large numbers (FSLLN), respectively, under heavy-traffic regimes. These high-level models are appropriate for modeling large-scale service systems with many servers, such as call centers or large service networks. This review will help practitioners select the appropriate level of modeling to enhance their understanding of the dynamic behavior of manufacturing or service systems. Enhanced understanding will ensure that optimal policies can be designed to improve system performance. Researchers in operation analytics and optimization of manufacturing and logistics also benefit from such a review.

Keywords： stochastic modeling     QBD process     PH distribution     heavy traffic limits     diffusion process    

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Carbon dots-based fluorescence sensor for two-photon imaging of pH in diabetic mice

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 3,   Pages 298-306 doi: 10.1007/s11705-022-2212-9

Abstract: Herein, a reversible pH fluorescent sensor was developed using caffeic acid as the precursor by one-stepThe carbon dots-based sensor (CA-CDs) exhibited pH-dependent increase in fluorescence intensity and showedlinear relationship in the range of pH 6.60 and 8.00.Notably, the fluorescence sensor has a reversible response to pH change.The present study provides a simple analytical method for pH detection suitable for in vivo.

Keywords： carbon dots     two-photon imaging     pH     diabetic mice    

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Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium and

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

Frontiers of Environmental Science & Engineering 2010, Volume 4, Issue 4,   Pages 421-429 doi: 10.1007/s11783-010-0265-3

Abstract: tetracycline (TC, H L) on sediments and soils in the presence and absence of cadmium (Cd), as affected by pHLower pH facilitated TC sorption through a cation exchange mechanism, which also took place at pH valuesWhen pH was above 7, however, ligand-promoted dissolution of TC might occur due to TC weakening the Al-Oincreased TC sorption on both sediments and soils, which resulted from the decrease of equilibrium solution pH

Keywords： sorption     tetracycline (TC)     pH     cadmium (Cd)     antibiotic    

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Effect of pH on biologic degradation of

Hongjing LI, Mengli HAO, Jingxian LIU, Chen CHEN, Zhengqiu FAN, Xiangrong WANG

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 2,   Pages 224-230 doi: 10.1007/s11783-011-0314-6

Abstract: In this paper, the effect of pH on biological degradation of by alga-lysing bacteria in laboratory-scaleUnder pH 6.5, 7.5, and 8.5 conditions, the removal rates of were respectively 75.9%, 83.6%, and 78.3%It was observed that the sequence of the removal efficiencies of algae, and organic matter were pH7.5>pH 8.5>pH 6.5.

Keywords： pH     biological degradation     alga-lysing bacteria     sequencing batch biofilm reactor (SBBR)     16S rRNA        

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A Cu-modified active carbon fiber significantly promoted HS and PH simultaneous removal at a low reaction

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 6, doi: 10.1007/s11783-021-1425-3

Abstract:

• Cu0.15-ACF performs the best for H2S and PH<

Keywords： ACF     H2S     PH3     Cu     Low temperature     Simultaneous removal    

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Decomposition of perfluorooctanoic acid by microwave-activated persulfate: Effects of temperature, pH

Yuchi LEE, Shanglien LO, Jeff KUO, Chinghong HSIEH

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 1,   Pages 17-25 doi: 10.1007/s11783-011-0371-x

Abstract: The objectives of this study were to investigate the effects of pH (pH= 2.5, 6.6, 8.8, and 10.5), chlorideMaximum PFOA degradation occurred at pH 2.5, while little or no degradation at pH 10.5.Lowering system pH resulted in an increase in PFOA degradation rate.Both high pH and chloride concentrations would result in more scavenging of sulfate free radicals and

Keywords： microwave     perfluorooctanoic acid     pH     persulfate     chloride ions     perfluorocarboxylic acids    

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Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution

Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong

Frontiers of Chemical Science and Engineering 2021, Volume 15, Issue 5,   Pages 1134-1146 doi: 10.1007/s11705-020-2014-x

Abstract: , high-performance, and stable electrocatalysts for the hydrogen evolution reaction (HER) over wide pHdenoted as V -NiCoP/CFP) were constructed by doping V modulation on NiCoP nanosheets on CFP and used for pH-universalinspiration to rationally enhance or design new-type nonprecious metal-based, highly efficient, and pH-universal

Keywords： hydrogen evolution reaction     transition metal phosphides     pH-universal     vanadium doping     carbon fiber paper    

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Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production: effect of pH

Leiyu FENG, Yuanyuan YAN, Yinguang CHEN

Frontiers of Environmental Science & Engineering 2011, Volume 5, Issue 4,   Pages 623-632 doi: 10.1007/s11783-011-0334-2

Abstract: Effect of pH ranging from 4.0 to 11.0 on co-fermentation of waste activated sludge (WAS) with food wasteThe SCFAs production at pH 6.0, 7.0, 8.0, and 9.0 and fermentation time of 4 d was respectively 5022.7, 6540.5, 8236.6, and 7911.7 mg COD·L , whereas in the blank tests (no pH adjustment, pH 8.0 (blank testThe composition of SCFAs at pH from 6.0 to 9.0 was also different from other conditions and propionicof the mixture of WAS and food waste at different pH conditions.

Keywords： waste activated sludge (WAS)     food waste     co-fermentation     short-chain fatty acids (SCFAs)     pH     synergistic    

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Aptamer-coded DNA nanoparticles for targeted doxorubicin delivery using pH-sensitive spacer

Pengwei Zhang, Junxiao Ye, Ergang Liu, Lu Sun, Jiacheng Zhang, Seung Jin Lee, Junbo Gong, Huining He, Victor C. Yang

Frontiers of Chemical Science and Engineering 2017, Volume 11, Issue 4,   Pages 529-536 doi: 10.1007/s11705-017-1645-z

Abstract: oligodeoxynucleotide coded with PSMA-targeted aptamer, drug-loading domain, primer binding site and pH-sensitiveDue to the integrated pH-sensitive spacers in the nanoparticles, in an acidic environment, the cumulative

Keywords： aptamer     DNA nanoparticles     rolling circle amplification     doxorubicin     drug delivery     pH sensitive    

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Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol wastewater

ZHOU Xuefei, REN Nanqi

Frontiers of Environmental Science & Engineering 2007, Volume 1, Issue 1,   Pages 53-56 doi: 10.1007/s11783-007-0010-8

Abstract: The results show that the pH of the first UASB changed from 4.9 to 5.8 and 5.5 to 6.2 for the secondApparently, these were not the advisable pH levels that common methanogenic bacteria could accept.Methanosarcina barkeri, had some acid resistance and could still degrade methanol at pH 5.0.bacteria within its body against the impact of the acidic environment and make them degrade methanol at pHThe performance of granular sludge was attributed to its structure, bacteria species, and the distribution

Keywords： pH     Granular     upflow anaerobic     advisable pH     methanogenic    

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Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO

Jiangkun DU,Jianguo BAO,Wei HU

Frontiers of Environmental Science & Engineering 2015, Volume 9, Issue 5,   Pages 919-928 doi: 10.1007/s11783-015-0794-x

Abstract: titanium plate (Pd/TiO NTs/Ti) for efficient electrodechlorination of 2,4-chlorophenol with a mild pHefficiency of up to 91% was achieved within 60 min at cathode potential of −0.7 V ( SCE) and initial pHThe effects of the applied cathode potential and initial pH on the degradation efficiency were studied

Keywords： Pd/TiO2NTs/Ti cathode     chlorophenols     electrocatalytic dechlorination     wastewater treatment    

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Removing ammonia from air with a constant pH, slightly acidic water　spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

Frontiers of Environmental Science & Engineering 2016, Volume 10, Issue 6, doi: 10.1007/s11783-016-0869-3

Abstract: The objective of this study was to determine if a spray scrubber with slightly acidic and higher pH scrubbingsolution (pH from 2 to 8) could effectively remove NH from NH laden air (such as animal building exhaustFirst, the solution pH was varied from 2 to 8 while maintaining constant air velocity at 1.3 m·s .Next, air velocity was increased (2 and 3 m·s ) while solution pH remained constant at pH6.At 1.3 m·s , NH removal efficiencies ranged between 49.0% (pH8) and 84.3% (pH2).

Keywords： Ammonia     Spray wet scrubber     Slightly acidic scrubbing solution     Controlled pH     Removal efficiency    

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Degradable Plastics Are Vulnerable to Cracks Letter

Xuxu Yang, Jason Steck, Jiawei Yang, Yecheng Wang, Zhigang Suo

Engineering 2021, Volume 7, Issue 5,   Pages 624-629 doi: 10.1016/j.eng.2021.02.009

Abstract: In our testing range, the crack velocity was insensitive to load but was sensitive to humidity and pH

Keywords： Degradation     Plastics     Hydrolysis     pH     Cracking    

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Inspection System of Carbonate Equilibrium for Groundwater

Liu Jiangang,Zheng Kexun,Fu Weining,Wu Shunhua

Strategic Study of CAE 2003, Volume 5, Issue 9,   Pages 61-64

Abstract: H2C03, HC03- and CC32- and water pHIt finds out that the demarcation point of pH that is called pHO when the quantity of HCO5 Pa and the groundwater temperature varies from 0 to 30℃ . pHThe pHO in groundwatar of limestone is almost equal to that of dolomite limestone owing to

Keywords： carbonate rock     groundwater     carbonate equilibrium     pH value    

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The effect of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between

Asghar Azizi, Seid Ziaoddin Shafaei, Mohammad Noaparast, Mohammad Karamoozian

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 4,   Pages 464-471 doi: 10.1007/s11705-013-1356-z

Abstract: The role of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions betweenThe galvanic current density decreased as the solution pH and percent solids increased.

Keywords： steel ball     galvanic interaction     pyrite     chalcopyrite     polarization curves    

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Title Author Date Type Operation

Hierarchical modeling of stochastic manufacturing and service systems

Zhe George ZHANG, Xiaoling YIN

Journal Article

Carbon dots-based fluorescence sensor for two-photon imaging of pH in diabetic mice

Journal Article

Sorption of tetracycline to sediments and soils: assessing the roles of pH, the presence of cadmium and

Guixiang ZHANG, Xitao LIU, Ke SUN, Ye ZHAO, Chunye LIN

Journal Article

Effect of pH on biologic degradation of

Hongjing LI, Mengli HAO, Jingxian LIU, Chen CHEN, Zhengqiu FAN, Xiangrong WANG

Journal Article

A Cu-modified active carbon fiber significantly promoted HS and PH simultaneous removal at a low reaction

Journal Article

Decomposition of perfluorooctanoic acid by microwave-activated persulfate: Effects of temperature, pH

Yuchi LEE, Shanglien LO, Jeff KUO, Chinghong HSIEH

Journal Article

Tuning the electronic structure of NiCoP arrays through V doping for pH-universal hydrogen evolution

Yu Lin, Jinlei Wang, Duanlin Cao, Yaqiong Gong

Journal Article

Co-fermentation of waste activated sludge with food waste for short-chain fatty acids production: effect of pH

Leiyu FENG, Yuanyuan YAN, Yinguang CHEN

Journal Article

Aptamer-coded DNA nanoparticles for targeted doxorubicin delivery using pH-sensitive spacer

Pengwei Zhang, Junxiao Ye, Ergang Liu, Lu Sun, Jiacheng Zhang, Seung Jin Lee, Junbo Gong, Huining He, Victor C. Yang

Journal Article

Acid resistance of methanogenic bacteria in a two-stage anaerobic process treating high concentration methanol wastewater

ZHOU Xuefei, REN Nanqi

Journal Article

Efficient dechlorination of 2,4-dichlorophenol in an aqueous media with a mild pH using a Pd/TiO

Jiangkun DU,Jianguo BAO,Wei HU

Journal Article

Removing ammonia from air with a constant pH, slightly acidic water　spray wet scrubber using recycled

Ahmad Kalbasi Ashtari, Amir M. Samani Majd, Gerald L. Riskowski, Saqib Mukhtar, Lingying Zhao

Journal Article

Degradable Plastics Are Vulnerable to Cracks

Xuxu Yang, Jason Steck, Jiawei Yang, Yecheng Wang, Zhigang Suo

Journal Article

Inspection System of Carbonate Equilibrium for Groundwater

Liu Jiangang,Zheng Kexun,Fu Weining,Wu Shunhua

Journal Article

The effect of pH, solid content, water chemistry and ore mineralogy on the galvanic interactions between

Asghar Azizi, Seid Ziaoddin Shafaei, Mohammad Noaparast, Mohammad Karamoozian

Journal Article