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Time Interval Alignment （IA） Scheduling Policies and Applications

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Time Interval Alignment （IA） Scheduling Policies and Appli...

THE TIME INTErVAL ALIGNMENT (IA) POLICIES, BOUNDArY AND APPLICATIONS WITH MULTIPLE STrEAM ArrIVALS

2011 Chinese Control and Decision Conference（CCDC）

作者： James r.perkins Department of System Engineering Boston University

This paper discusses a class of interval alignment （IA） scheduling policies,which are particularly effective for non-Markovian ***,much effort has been put into removing variability from the flow of material in *** IA policies effectively smoothen part flows,improve performance and decrease average Work-in-Process （WIP） and lead times by adding intermediate delays to the system.

关键词： interval alignment policy lead time reduction detail scheduling integer linear programming

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Journal of Systems Science and Systems Engineering 2011年第4期20卷 400-415页

作者： Meimei WANG James r. perkins Decision Support Information System Beth Israel Deaconess Medical Center Boston MA 02120 USA Department of Manufacturing Engineering Boston University Boston MA 02446 USA

This paper discusses a class of interval alignment （IA） scheduling policies, which are particularly effective for the systems that do not have Markovian structure. The numerical results show that IA policies effectively smooth part flows, improve performance and decrease average Work-in-Process （WlP） by adding intermediate delays to the system, The boundary of IA policy is proven and the applications of IA policy in the system with multiple stream arrivals have been discussed. With the combination of release policy, it is practical to implement IA to multiple stream arrival system.

关键词： Detailed scheduling policies non-Markovian multiple stream interval alignment policies integer linear programming lea

Integration of biocrude production from fast pyrolysis of biomass with solar PV for dispatchable electricity production

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Clean Energy 2018年第2期2卷 85-101页

作者： Greg perkins Ventura Energy Brisbane4001Australia

This article analyses the integration of distributed biocrude production facilities using fast pyrolysis with solar photovoltaic(PV)for dispatchable electricity *** strong growth of intermittent electricity generation from solar PV and wind is leading to a greater need for energy storage at grid scale and dynamic demand *** forms of energy storage,including electrochemical(***),mechanical(***)and gravitational(***-hydro),are being *** work studies the issues of integrating fast pyrolysis of biomass to produce biocrude that can be readily stored in tanks and combusted to produce electricity when required to supplement the electricity generation from a solar PV unit to meet an arbitrary energy demand *** use of biomass pyrolysis in this application has a range of benefits,including the flexibility to augment intermittent renewables,the integration of more bioenergy into the electricity sector and the creation of commercial quantities of biocrudes that can be refined into renewable transport fuels such as jet fuel for which few other alternatives ***,especially partially upgraded,can be stored and used when required in engines and gas turbines,making them a suitable fuel for augmenting the intermittent nature of solar and wind *** development of the distributed 100%renewable power stations using a mix of biomass/biocrude and solar PV and/or wind would also increase the certainty of supply,knowledge of quality and price of raw biocrudes that can also be used to supply a centralized biorefinery,thereby substantially reducing the risk of investing in new biorefinery capacity.

关键词： biomass pyrolysis biocrude intermittent renewables biofuels

A O-dimensional cavity growth submodel for use in reactor models of underground coal gasification

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International Journal of Coal Science & Technology 2019年第3期6卷 334-353页

作者： Greg perkins Martin Parry Technology Brisbane QLD 4001 Australia School of Chemical Engineering The University of Queensland Brisbane QLD 4072 Australia

Modelling of the underground coal gasification process is dependent upon a range of sub-models. One of the most important is the calculation of the cavity growth rate as a function of various operating conditions and coal properties. While detailed 1-dimensional models of coal block gasification are available, it is not easy to couple them directly with reactor models, which aim to simulate the complete process. In this paper, a O-dimensional cavity growth sub-model is presented. The model is based on the concept of a surface reaction and incorporates physics to account for moisture evaporation, water influx, coal pyrolysis, coal thermo-mechanical fragmentation and the build up of an ash layer on the char. The model is validated using measurements from laboratory experiments on coal cores and coal blocks. A comparison of calculated results from several UCG field trials shows that the model can provide good estimates of cavity growth rate for reasonable input parameters. Finally, simulation results of cavity growth in the combustion and gasification zones as a function of the bulk gas temperature, gas pressure, water influx rate, ash layer thickness and coal fragmentation behaviour are presented.

关键词： Underground coal gasification Cavity growth Chemical reaction

Linking uplift and mineralisation at the Mount Novit Zn-Pb-Ag Deposit,Northern Australia:Evidence from geology,U-Pb geochronology and sphalerite geochemistry

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Geoscience Frontiers 2022年第2期13卷 333-350页

作者： Bradley Cave William perkins richard Lilly Department of Earth Sciences University of AdelaideAdelaideSAAustralia Geological Survey of Queensland BrisbaneQLDAustralia

The subeconomic Mount Novit Zn-Pb-Ag deposit is located approximately 20 km south of Mount Isa,*** contrast to the nearby Mount Isa,Hilton and George Fisher Zn-Pb-Ag deposits,mineralisation at Mount Novit is situated to the west of the regional-scale Mount Isa Fault and is hosted in the Moondarra Siltstone as opposed to the Urquhart ***-grade(ralisation primarily replaces pre-existing carbonate alteration and veining and consists of pyrrhotite,pyrite and sphalerite with lesser ***-grade(>10 wt.%Zn+Pb)mineralisation occurs as a matrix supported breccia dominated by sphalerite and pyrrhotite with galena,pyrite,and ***-situ U-Pb geochronology was completed on apatite and two textural varieties of ***-grained(ral to anhedral monazite is located within highly foliated biotite alteration directly adjacent Zn-Pb-Ag mineralisation and yields a mean weighted^(207)Pb/^(206)Pb age of 1527±18 Ma(MSWD=1.06).This age is consistent with the formation of highly foliated biotite alteration during D;deformation of the Isan *** from the same fabric yields a lower intercept age of1443±29 Ma(MSWD=1.30).Consistent with previous studies,this age is interpreted to represent the age of a major thrusting event along the Mount Isa Fault that resulted in the cooling of the Mount Novit area below~375℃.Coarse-grained monazite is coeval with Zn-Pb-Ag mineralisation and yields a mean weighted^(207)Pb/^(206)Pb age of 1457±11 Ma(MSWD=0.28).Sphalerite from Mount Novit has low concentrations(relatively high concentration of In(5 to>10 ppm),possibly reflecting the leaching of the metals from an underlying basement *** GGIMFis geothermometer(Frenzel et al.,2016)produced a mean formation temperature of 345±52℃.The timing and temperature of Zn-Pb-Ag mineralisation is consistent with the age and cooling temperature of apatite presented in this *** on these correlations,we

关键词： Mount Isa Mount Novit Zn-Pb-Ag mineralisation Monazite Apatite Geochronology

T lymphocyte apoptosis induced by CD8ε chimera

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Chinese Science Bulletin 1997年第3期42卷 222-227页

作者： David perkins Cox Terhorst Harvard Medical School BostonMAUSAHarvard Medical SchoolBostonMAUSA

THE T cell repertoire is characterized by an extremely diverse population of different surface receptors (TCr) which participates in highly specific responses to a large number of different antigens and mediate antigen stimulation signals. Variable heterodimers of TCr α/β and γ/δ receptors are associated with invariable CD3γ, δ, ε and ζ proteins, thus forming the TCr/CD3 complex. CD3ε plays an important role in the initiation of TCr resembling and signfal transduction among the octopeptide chains. Stimulation by anti-CD3ε monoclonal

关键词： T lymphocyte apoptosis CD8ε chimera.

Invasion syndromes:hypotheses on relationships among invasive species attributes and characteristics of invaded sites

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Journal of Arid Land 2013年第3期5卷 275-283页

作者： Lora B perkins robert S NOWAK Department of Natural resource Management South Dakota State UniversityBrookings SD 57007USA Department of Natural resources & Environmental Science University of NevadaReno NV 89557USA

As invasion science accepts that there is no single causal factor for biological invasion, the identification of groups of traits that are often associated, or ＂syndromes＂, is a logical move forward. Invasion syndromes are proposed to identify suites of site conditions （biotic and environmental） that render a site vulnerable to invasion by different types of invaders. This paper proposed four invasion syndromes which relate invader attributes （competitive ability, niche construction, phenotypic plasticity, and phenological niche separation） to the biotic characteristics （biodiversity and enemies） and environmental conditions （resource abundance and fluctuation） of invaded sites. The four invasion syndromes described in this paper are a development of hypotheses of how the many factors that influence species invasion might be associated. Invasion Syndrome 1 proposes that sites with relatively high resource abundance and high diversity should be vulnerable to invasion by species with high competitive ability. Invasion Syndrome 2 hypothesizes that sites with relatively low resource abundance and low diversity should be vulnerable to invasion by species with niche construction ability. Invasion Syndrome 3 postulates that sites with moderate or fluctuating resources and moderate diversity should be vulnerable to invasion by species with high phenotypic plasticity. Invasion Syndrome 4 hypothesizes that species introduced into a site where it has phenological niche separation from natives will not have to contend with interference from the biotic community at a site （diversity or natural enemies） and may invade where ever site environmental conditions suit its life history. Further work is needed to support, contradict, or refine these hypotheses and almost certainly will identify more invasion syndromes.

关键词： non-native competitive ability niche construction ecosystem engineering phenotypic plasticity phenological niche separation

The Laozi and the Cosmogonic Turn in Classical Chinese Philosophy

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Frontiers of Philosophy in China 2016年第2期11卷 185-205页

作者： Franklin perkins Department of Philosophy Nanyang Technological University 50 Nanyang Avenue Singapore639798 Sinagapore

In the past several decades, our understanding of the Laozi has been revolutionized by the discovery of new textual materials. While research has focused on various manuscript copies, the discovery of other cosmogonic texts dated to the late fourth century BC indicate that the Laozi was not as unique as it once seemed. Taken together, these texts show a radical shift in philosophical orientation occurring by the late 4th century BC, a change toward concerns with cosmogony and accounts of human beings as merely one part of the natural world. The goal of this paper is to analyze the various elements of this shift, using the Taiyi Sheng Shui 太一生水（Great One Generates Water）, Hengxian 恒先（Constancy First）, and Fan Wu Liu Xing 凡物流形（All Things Flow into Form）, along with Lhe Laozi bamboo strips found at Guodian. The first section examines the commonalities between the various cosmogonies; the second places cosmogony in the context of other distinctive concerns that the texts share, turning toward the ;implications of the cosmogonies for human action. The final section examines orLe of the fundamental points on which the texts disagree.

关键词： Laozi Cosmogony excavated texts Guodian

Structural Challenges to Sustained Economic Growth in China

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China & World Economy 2023年第1期31卷 22-43页

作者： Dwight H.perkins Department of Economics Harvard UniversityUS

This essay focuses on three broad sets of issues that may not slow China's GDP growth to under 3 percent a year,but they will almost certainly create major social and physical problems that will be difficult to deal *** first is the demographic and education challenges featured by a rapidly aging population combined with a large share of the population being *** second is the environmental challenges China faces in achieving the state goal of carbon neutrality by *** third challenge is low consumption and unprecedentedly high investment,a strategy that has driven China's high growth rates in the past decades but is no longer *** three challenges are intertwined,making China's adjustment path even more *** would a sustainable development strategy involve?The clearest need is to shift investment away from energy-intensive housing and infrastructure and toward investment in people.

关键词： carbon neutrality development strategy middle income sustainable growth