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The state of the art in scale inhibitor squeeze treatment

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Petroleum Science 2020年第6期17卷 1579-1601页

作者： Amy T.Kan Zhaoyi Dai Mason B.Tomson department of Civil and Environmental Engineering Rice University6100 Main StreetHoustonTX 77005USA

The mechanistic understanding of the reactions that govern the inhibitor retention and release,modeling,and the state-ofthe-art innovation in squeeze treatment are *** retention and release are governed by(1)the amount of calcite that can dissolve prior to inhibitor-induced surface poisoning;(2)calcite surface poisoning after^20 molecular layers of surface coverage by the adsorbed inhibitors to retard further calcite dissolution;(3)less base,CO3^2-,is released into the aqueous solution;(4)formation of the more acidic inhibitor precipitates;(5)phase transformation and maturation of the more acidic inhibitor precipitates;and(6)dissolution of the less soluble crystalline inhibitor *** trend to advance squeeze technologies is through(1)enhancing scale inhibitor retention,(2)optimizing the delivery of scale inhibitors to the target zone,and(3)improving monitoring ***,a prototype yardstick for measuring the squeeze performance is used to compare the squeeze life of 17 actual squeeze *** though the various squeeze treatments appear to be *** published squeeze durations can be rated based on the normalized squeeze life per unit mass of inhibitors.

关键词： Scale inhibitor squeeze Inhibitor retention Surface poisoning Adsorption Squeeze life

A dual-gelling poly(N-isopropylacrylamide)-based ink and thermoreversible poloxamer support bath for high-resolution bioprinting

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Bioactive Materials 2022年第8期7卷 302-312页

作者： Adam M.Navara Yu Seon Kim Yilan Xu Christopher L.Crafton Mani Diba Jason L.Guo Antonios G.Mikos department of Bioengineering Rice University6500 Main StreetHoustonTX77030USA

Extrusion bioprinting is a popular method for fabricating tissue engineering scaffolds because of its potential to rapidly produce complex,bioactive or cell-laden ***,due to the relatively high viscosity required to maintain shape fidelity during printing,many extrusion-based inks lack the ability to achieve precise structures at scales lower than hundreds of *** this work,we present a novel poly(N-isopropylacrylamide)(PNIPAAm)-based ink and poloxamer support bath system that produces precise,multi-layered structures on the tens of micrometers *** support bath maintains the structure of the ink in a hydrated,heated environment ideal for cell culture,while the ink undergoes rapid thermogelation followed by a spontaneous covalent crosslinking *** the combination of the PNIPAAm-based ink and poloxamer bath,this system was able to produce hydrogel scaffolds with uniform fibers possessing diameters tunable from 80 to 200μm.A framework of relationships between several important printing factors involved in maintaining support and thermogelation was also *** a whole,this work demonstrates the ability to produce precise,acellular and cell-laden PNIPAAm-based scaffolds at high-resolution and contributes to the growing body of research surrounding the printability of extrusion-based bioinks with support baths.

关键词： Bioprinting Thermogelling macromer Tissue engineering Printability

Using statistical learning to predict interactions between single metal atoms and modified MgO(100) supports

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npj Computational Materials 2020年第1期6卷 811-823页

作者： Chun-Yen Liu Shijia Zhang Daniel Martinez Meng Li Thomas P.Senftle department of Chemical and Biomolecular Engineering Rice UniversityHoustonTX 77005USA department of Computer Science and Engineering School of Electrical Engineering and Computer SciencePennsylvania State UniversityUniversity ParkPA 16802USA department of Statistics Rice UniversityHoustonTX 77005USA

Metal/oxide interactions mediated by charge transfer influence reactivity and stability in numerous heterogeneous *** this work,we use density functional theory(DFT)and statistical learning(SL)to derive models for predicting how the adsorption strength of metal atoms on MgO(100)surfaces can be enhanced by modifications of the ***(100)in its pristine form is relatively unreactive,and thus is ideal for examining ways in which its electronic interactions with metals can be enhanced,tuned,and controlled.

关键词： reactivity adsorption stability

SnO2-reduced graphene oxide nanoribbons as anodes for lithium ion batteries with enhanced cycling stability

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Nano Research 2014年第9期7卷 1319-1326页

作者： Lei Li Anton Kovalchuk James M. Tour department of Chemistry Rice University 6 I00 Main Street Houston Texas 77005 USA Richard E. Smalley Institute for Nanoscale Science and Technology Rice University 6100 Main Street Houston Texas 77005 USA department of Materials Science and NanoEngineering Rice University 6100 Main Street Houston Texas 77005 USA

A nanocomposite material of SnO2-reduced graphene oxide nanoribbons has been developed. In this composite, the reduced graphene oxide nanoribbons are uniformly coated by nanosized SnO2 that formed a thin layer of SnO2 on the surface. When used as anodes in lithium ion batteries, the composite shows outstanding electrochemical performance with the high reversible discharge capacity of 1,027 mAh/g at 0.1 A/g after 165 cycles and 640 mAh/g at 3.0 A/g after 160 cycles with current rates varying from 0.1 to 3.0 A/g and no capacity decay after 600 cycles compared to the second cycle at a current density of 1.0 A/g. The high reversible capacity, good rate performance and excellent cycling stability of the composite are due to the synergistic combination of electrically conductive reduced graphene oxide nanoribbons and SnO2, The method developed here is practical for the large-scale development of anode materials for lithium ion batteries.

关键词： lithium ion battery tin oxide graphene oxide nanoribbons energy storage

Sedimentary structure of the western Bohai Bay basin and other basins in North China revealed by frequency dependent P-wave particle motion

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Geodesy and Geodynamics 2019年第5期10卷 372-381页

作者： Chenhao Yang Fenglin Niu department of Earth Environmental and Planetary SciencesRice University

High-resolution seismic models of sediment basins are critical inputs for earthquake ground motion prediction and petroleum resource *** this study we employed a newly developed technique that utilizes the frequency-dependent nonlinear P-wave particle motion to estimate sedimentary structure beneath the Bohai Bay basin.A recent study suggests that the delay of the P wave on the horizontal component relative the vertical component and its variations over frequency are caused by interference of the direct P wave with waves generated at the sediment *** frequency-dependent delay time can be used to constrain sediment thickness and seismic velocity beneath recording *** measured the particle motions of teleseismic P waves recorded by 249 broadband stations of the North China Array,which covers the western Bohai Bay basin and its surrounding *** found that the P waves of 90 stations inside the Bohai Bay basin and other local basins within the Taihang and Yanshan mountain ranges exhibit significant frequency-dependent nonlinear particle motions,and used the particle motion data to invert the sediment thickness(Z0)and surface S-wave velocity(β0).The estimated sediment thickness inside the Bohai Bay Basin varies from 1.02 km to 3.72 km,with an average of 3.20 km,which roughly agrees with previous active source studies.

关键词： Teleseismic P wave Nonlinear particle motion Frequency-dependent Sediment structure Bohai Bay basin

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Smart super rice

Science China(Life Sciences) 2017年第12期60卷 1460-1462页

作者： qian qian state key laboratory for rice biology china national rice research instituteHangzhou 310006China

To commemorate the 50th anniversary of the published paper“Male Sterility in rice”written by Professor Longping Yuan in the journal Chinese Science Bulletin,Professor Qifa Zhang published a topical collection Fifty Glorious Years of Hybrid rice by soliciting contributions in 2016,which he provided to the editorial department of Chinese Science Bulletin.

关键词： Smart super rice

Receiver function study of the crustal structure of Northeast China:Seismic evidence for a mantle upwelling beneath the eastern flank of the Songliao Basin and the Changbaishan region

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Earthquake Science 2011年第1期24卷 27-33页

作者： Huafeng Liu Fenglin Niu department of Earth Science Rice University Houston TX 77005 USA

Northeast China is a unique place to study intra-plate volcanism. We analyzed P-wave receiver function data recorded by 111 permanent broadband seismic stations in Northeast China. The results show that the crustal thickness varies from 27.9 km beneath the eastern flank of the Songliao Basin to 40.7 km beneath the Great Xing＇an Range region. The large depth variations of the Moho can be largely but not completely explained by surface topography. The residual Moho depth calculated based on the Airy＇s isostasy model indicates that the Moho is dynamically uplifted by 〈3 km beneath the eastern flank of the Songliao Basin and the Changbaishan region. We suggest that a mantle upwelling, which has been proposed by several recent seismic studies, might have caused the uplift.

关键词： receiver function Moho Northeast China mantle upwelling

Interfacial Charge Transfer in Nanoscale Polymer Transistors

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Nano Research 2008年第4期1卷 341-350页

作者： Jeffrey H.Worne Rajiv Giridharagopal Kevin F.Kelly Douglas Natelson department of Electrical and Computer Engineering Rice University6100 Main St.HoustonTX 77005USA department of Physics and Astronomy Rice University6100 Main St.HoustonTX 77005USA

Interfacial charge transfer plays an essential role in establishing the relative alignment of the metal Fermi level and the energy bands of organic *** the details remain elusive in many systems,this charge transfer has been inferred in a number of photoemission *** present electronic transport measurements in very short channel(L<100 nm)transistors made from poly(3-hexylthiophene)(P3HT).As channel length is reduced,the evolution of the contact resistance and the zero gate voltage conductance are consistent with such charge *** channel conduction in devices with Pt contacts is greatly enhanced compared to analogous devices with Au contacts,consistent with charge transfer *** current scanning tunneling microscopy(ACSTM)provides further evidence that holes are transferred from Pt into P3HT,while much less charge transfer takes place at the Au/P3HT interface.

关键词： Organic semiconductors band alignment charge transfer organic field-effect transistor scanning tunneling microscopy

Morpho-Physiological Changes in Roots of rice Seedling upon Submergence

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rice science 2019年第3期26卷 167-177页

作者： Liem T.BUI Evangelina S.ELLA Maribel L.DIONISIO-SESE Abdelbagi M.ISMAIL department of Plant Biotechnology Cuu Long Delta Rice Research Institute Crop and Environmental Sciences Division International Rice Research Institute Institute of Biological Sciences University of the Philippines Los Ba?os College

Submergence is a serious environmental condition that causes large loss in rice production in rain fed lowland and flood affected area. This study evaluated morphological and physiological responses of rice roots to submergence using two tolerant rice genotypes FR13A and Swarna-Sub 1 and two sensitive ones Swarna and IR42. The tolerant genotypes had higher survival rate and less shoot elongation but greater root elongation during submergence than the sensitive ones. After submergence,the tolerant genotypes also had higher root dry weight and more active roots than the sensitive *** genotypes exhibited less root injury, with less malondialdehyde production and slower electrolyte leakage after submergence. Tolerant genotypes also maintained higher concentrations of soluble sugar and starch in roots and shoots and higher chlorophyll retention after submergence than the sensitive *** data showed that root traits such as root activity and root growth are associated with survival rate after submergence. This is probably accomplished through higher energy supply, and membrane integrity is necessary to preserve root function and reduce injury during submergence. These root traits are important for submergence tolerance in rice.

关键词： peroxidase root activity submergence rice seedling Sub1a gene