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Review:Investigation of Partially Pre⁃mixed Charge Ignitions(PPCI)Engine Mode

Journal of Harbin Institute of Technology(New Series) 2023年第3期30卷 85-94页

作者： Habtamu Deresso venkata ramayya ancha Ramesh Babu Nallamothu Balkeshwar Singh Bisrat Yoseph Department of Mechanical Engineering Adama Science and Technology UniversityAdama 1888Ethiopia Department of Mechanical Engineering Jimma University Institute of TechnologyJimma 378Ethiopia Departments of Mechanical Engineering Defense College of EngineeringBishoftu 1014Ethiopia

This paper embraces the key points of unpolluted internally combusted engine *** objective is focused on the recent effort to improve compression ignition(CI)and spark ignition(SI)engine to have fuel⁃efficient and minimized pollutant *** are many advanced internal combustion engines to overcome the challenges of conventional compression ignition engines of the high level of particulate matter(PM)and oxides of nitrogen *** of the latest options on which many researchers work recently is low⁃temperature combustion which studies the engine advancement and emission at the same *** review focuses on the released emissions,incinerations and performances features of partially premixed charge ignition with different fuel blends like n⁃butanol⁃gasoline,gasoline⁃diesel,alcohol⁃diesel,and NG⁃diesel effect on partially premixed charge ignition(PPCI)engine ***,PPCI is a single or a dual fuel strategy in that a pre⁃mixed low or high reactive fuel(L/HRF)is directly injected into the *** is one of the best low⁃temperature combustion(LTC)strategies by which emissions are minimized while thermal efficiency is *** recent PPCI of various fuels and their effect are ***,the initial pilot injection can extend the operating load that is a problem in diesel engine;gasoline fuel displayed fewer soot releases when compared with diesel oil in all working *** additional inspiring outcome for this combustion approach can be directly controlled by using the start of injection timing(SOI),which is impossible with most other LTC *** diesel PPCI can overcome the NOx⁃PM tradeoff but needs more EGR *** problem of diesel engine PPCI is associated with its comparatively higher boiling point and relatively lower volatility,which made use of advanced injection with a great number of fuel ***,diesel fuel is not the best candidate with the LRF to the PPCI engine setup.

关键词： CDC emission low⁃temperature combustion performance PPCI

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Heat Transfer Validation and Comparative Evaluation of Biochar Yield from Pyrolysis Cook Stove

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Journal of Agricultural Science and Technology(B) 2015年第6期5卷 389-400页

作者： Teka Tesfaye Mengesha ancha venkata ramayya Oromia Agricultural Research Institute Jimma Agricultural Engineering Research Center P.O. Box 386 Jimma Ethiopia Jimma University Institute of Technology P.O. Box 378 Jimma Ethiopia

The developing world still largely depends on biomass, such as wood, animal dung and agricultural waste for domestic fuel sources that are typically burned in traditional stoves. Ethiopia has different biomass resource for biochar production, through pyrolysis cook stove co-producing biochar. Coffee husks are the major solid residues from the handling and processing of coffee in the study area. This study was to evaluate the biochar co-producing pyrolysis cook stove with respect to heat transfer through the bed and biochar yield. From allothermal type of pyrolysis cook stove, the stove design was selected for both the computational fluid dynamic （CFD） simulation and experimental measurements. ANSYS 14.5 was used for CFD simulation of the wood combustion. The production of biochar from coffee husk, corncob and sawdust at different heating times, bed and stove surface temperature were undertaken. Bulk density, pH and surface area of the biochar were measured. While good agreement between simulation and experimental result was obtained in the conduction phase during pyrolysis, deviation between the two on account of the effect of volatile gas in changing the temperature trend within the biomass bed was noticed. Within the biomass type, the maximum mean biochar yield （38.91%） was seen from coffee husk. In the case of different stove designs, the minimum mean biochar yield （27.11%） was found from normal Anila stove. The pH of biochar is found to be significantly affected by the type of biomass （9.83 mean for corncob and coffee husk, 6.43 mean for sawdust）, heating time （9.19 mean for 90 min and 8.01 mean for 30 min） and stove type （9.52 mean for normal Anila and 8.01 mean for flangeless Anila continuous feeding type）. In fact, the type of biomass is observed to significantly affect the bulk density and surface area ofbiochar.

关键词： Biochar temperature cook stove biomass pyrolysis soil CFD simulation.

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Understanding taxi drivers＇ routing choices from spatial and social traces

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Frontiers of Computer Science 2015年第2期9卷 200-209页

作者： Siyuan LIU Shuhui WANG Ce LIU ramayya KRISHNAN Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China University of Chinese Academy of Sciences Beijing 100049 China Heinz CoUege Carnegie Mellon University Pittsburgh PA 15213 USA Key Lab of Intellectual Information Processing Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China School of Information Sciences University of Pittsburgh Pittsburgh PA 15260 USA

Most of our learning comes from other people or from our own experience. For instance, when a taxi driver is seeking passengers on an unknown road in a large city, what should the driver do？ Alternatives include cruising around the road or waiting for a time period at the roadside in the hopes of finding a passenger or just leaving for another road enroute to a destination he knows （e.g., hotel taxi rank）？ This is an interesting problem that arises everyday in cities all over the world. There could be different answers to the question poised above, but one fundamental problem is how the driver learns about the likelihood of finding passengers on a road that is new to him （as he has not picked up or dropped off passengers there before）. Our observation from large scale taxi driver trace data is that a driver not only learns from his own experience but through interactions with other drivers. In this paper, we first formally define this problem as socialized information learning （SIL）, second we propose a framework including a series of models to study how a taxi driver gathers and learns information in an uncertain environment through the use of his social network. Finally, the large scale real life data and empirical experiments confirm that our models are much more effective, efficient and scalable that prior work on this problem.

关键词： routing choices socialized information learn-ing social network

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Gamma Vibrational Bands and Chiral Doublet Bands in A≈100 Neutron-rich Nuclei

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原子核物理评论 2009年第S1期26卷 64-69页

作者： J.H.Hamilton A.V.ramayya J.K.Hwang J.O.Rasmussen S.Frauendorf V.Dimitrov Department of Physics Vanderbilt University Lawrence Berkeley National Laboratory Physics Department Notre Dame University

The level structures of neutron-rich 105Mo,106Mo,108Mo and 110Ru nuclei in A ≈ 100 region have been carefully investigated by coincidence measurements of the prompt γ-rays populated in the spontaneous fission of 252Cf with the Gammasphere detector array. In 105Mo,one-phonon K=9/2 and two-phonon K=13/2 γ-vibrational bands have been identified. In 108Mo,one-phonon γ-vibrational band is expanded and two-phonon γ-vibrational band has been identified. Two similar sets of bands in 106Mo and 110Ru are observed to high spins,which have been proposed as the soft chiral γ-vibrational bands. The characteristics for these γ-vibrational bands and chiral doublet bands have been discussed.

关键词： high spin state neutron-rich nucleus γ-vibrational band chiral doublet band

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Collective Band Structures in Neutron-Rich ^108Mo Nucleus

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Chinese Physics Letters 2007年第6期24卷 1517-1520页

作者：丁怀博朱胜江 J.H.Hamilton A.V.ramayya J.K.Hwang Y.X.Luo J.0.Rasmussen I.Y.Lee 车兴来王建国徐强 Department of Physics Tsinghua University Beijing 100084 Department of Physics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA

High spin states in the neutron-rich ^108Mo nucleus are studied by measuring prompt γ-rays following the spontaneous fission of 252Cf with a Gammasphere detector array. The ground-state band is confirmed, and the one-phonon γ-vibrational band is updated with spin up to 12h. A new collective band with the band head level at 1422.4keV is suggested as a two-phonon γ-vibrational band. Another new band is proposed as a two-quasi- proton excitation band. Systematic characteristics of the collective bands are discussed.

关键词： Collective Structures Neutron-Rich

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High-Spin Structure in Neutron-Rich ^108Ru Nucleus

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Chinese Physics Letters 2004年第10期21卷 1904-1907页

作者：车兴来朱胜江 J.H.Hamilton A.V.ramayya J.K.Hwang 禹英男李明亮郑然成 I.Y.Lee J.O.Rasmussen Y.X.Luo W.C.Ma DepartmentofPhysics TsinghuaUniversityBeijing100084 DepartmentofPhysics VanderbiltUniversityNashvilleTennessee37235USA LawrenceBerkeleyNationalLaboratory BerkeleyCalifornia94720USA DepartmentofPhysics MississippiStateUniversityMississippi39762USA

High spin states in the neutron-rich 108Ru nucleus have been studied through measuring prompt γ-ray coincidences following the spontaneous fission of 252Cf with the Gammasphere detector array. The yrast band has been confirmed. The one-phonon γ-vibrational band and the two-quasiparticle band based on the 5− level have been extended up to 13+ and 15−, respectively. In addition, two levels at 1644.8keV and 1826.5keV excitation energies are newly identified and proposed to be the members of a two-phonon γ-vibrational band. It is shown that the 108Ru nucleus has triaxial deformation with parameters β2~0.29 and γ = −22 degrees from the total Routhian surface calculations. The observed band crossing in the yrast band is due to the alignment of a pair of h11/2 neutrons according to the cranked shell model calculations. The possible configuration for the two-quasiparticle band has been discussed.

关键词： Neutrons

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High-spin states in neutron-rich ^(102)Mo nucleus

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Chinese Physics C 2009年第S1期33卷 199-201页

作者：杨韵颐朱胜江 J. H. Hamilton A. V. ramayya J. K. Hwang J. O. Rasmussen 丁怀博王建国徐强顾龙 Department of Physics Tsinghua University Department of Physics Vanderbilt University

High-spin states in neutron-rich 102Mo nucleus have been studied by measuring the prompt γ-rays in the spontaneous fission of 252Cf. The previous level scheme has been updated and some new levels and transitions are identified. The one-phonon γ-band is expanded and a band head level of the two-phonon γ- band is proposed. The systematic characteristics of yrast bands, one-phonon γ-bands, two-phonon γ-bands and quasi-particle bands in 102Mo, 104Mo and 106Mo are discussed.

关键词： spontaneous fission neutron-rich nucleus γ-band quasi-particle band

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Two-Quasiparticle Bands and Isomers in ^98Sr

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Chinese Physics Letters 2004年第11期21卷 2147-2150页

作者：李明亮朱胜江 J.H.Hamilton A.V.ramayya J.K.Hwang 车兴来张征禹英男郑然成 I.Y.Lee J.O.Rasmussen Y.X.Luo W.C.Ma DepartmentofPhysics TsinghuaUniversityBeijing100084 DepartmentofPhysics VanderbiltUniversityNashvilleTennessee37235USA LawrenceBerkeleyNationalLaboratory Berkeley California94720USA DepartmentofPhysics MississippiStateUniversityMississippi39762USA

Rotational bands in neutron-rich 98Sr nucleus have been investigated by measuring high-fold prompt γ-ray coincidence events of the spontaneous fission of 252Cf with the Gammasphere detector array. A deformed K = 3 band built on the 1838keV level has been confirmed and extended. Another deformed K = 6 band based on the 2535keV level has been established. Both the bands originate most probably from the ν9/2[404]⊗ν3/2[411] two-quasiparticle configuration with Ω = |Ω1−Ω2| and Ω = |Ω1+Ω2|, respectively. Based on the delay-coincidence measurements, the half-lives for the K = 3 and K = 6 band head levels have been obtained to be 13±3ns and 4.5±1.0ns, respectively.

关键词： Isomers

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Search for Double γ-Vibrational Bands in Neutron-Rich ^105Mo Nucleus

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Chinese Physics Letters 2006年第12期23卷 3222-3225页

作者：丁怀博朱胜江 J. H. Hamilton A. V. ramayya J. K. Hwang Y. X. Luo J. O. Rasmussen I. Y. Lee 车兴来陈永静李明亮 Department of Physics Tsinghua University Beijing 100084 Department of Phvsics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA

Levels in the neutron-rich ^105Mo nucleus have been investigated by observing prompt γ-rays following the spontaneous fission fragments of^252 Cf with the Gammasphere detector array. The yrast band has been confirmed and updated. The other two collective bands with the band head levels at 870.5 and 1534.6 keV are newly observed, and they are suggested as the candidates for one-phonon K= 9/2 and two-phonon K = 13/2 double γ-vibrational bands, respectively. Systematic characteristics of these bands have been discussed.

关键词： Double γ-Vibrational Bands Systematic characteristics

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Reinvestigation of Collective Bands in ^107Tc

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Chinese Physics Letters 2009年第9期26卷 101-104页

作者：顾龙朱胜江 J. H. Hamilton A. V. ramayya J. K. Hwang 刘少华王建国罗亦孝 J. O. Rasmussen 李一阳丁怀博李科徐强杨韵颐 Department of Physics Tsinghua University Beijing 100084 Department of Physics Vanderbilt University Nashville Tennessee 37235 USA Lawrence Berkeley National Laboratory Berkeley California 94720 USA

The high spin states of a neutron-rich ^107 Tc nucleus are reinvestigated by observing prompt γ-rays from the spontaneous fission of ^252 Cf. The previous level scheme is updated. A collective band based on the π5/2- [303] orbital is confirmed and extended. Inconsistencies in the configuration assignments for a type of positive parity bands of odd-A 105,107,109 Tc in the previous reports are clarified according to the g factor calculations. A new band based on the 1499.5 keV level in ^107Tc is proposed as a two-phonon γ-vibrational band.

关键词： No English Keyword

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