gebhart/patrepeval huggingface dataset:
Ca‐Rich Ca–Al‐Oxide, High‐Temperature‐Stable Sorbents Prepared from Hydrotalcite Precursors: Synthesis, Characterization, and CO<sub>2</sub> Capture Capacity (2011)

We present the design and synthesis of Ca-rich Ca-Al-O oxides, with Ca(2+)/Al(3+) ratios of 1:1, 3:1, 5:1, and 7:1, which were prepared by hydrothermal decomposition of coprecipitated hydrotalcite-like Ca-Al-CO(3) precursors, for high-temperature CO(2) adsorption at 500-700 °C. In situ X-ray diffraction measurements indicate that the coprecipitated, Ca-rich, hydrotalcite-like powders with Ca(2+)/Al(3+) ratios of 5:1 and 7:1 contained Ca(OH)(2) and layered double hydroxide (LDH) phases. Upon annealing, LDH was first destroyed at approximately 200 °C to form an amorphous matrix, and then at 450-550 °C, the Ca(OH)(2) phase was converted into a CaO matrix with incorporated Al(3+) to form a homogeneous solid solution without a disrupted lattice structure. CaO nanocrystals were grown by thermal treatment of the weakly crystalline Ca-Al-O oxide matrix. Thermogravimetric analysis indicates that a CO(2) adsorption capacity of approximately 51 wt. % can be obtained from Ca-rich Ca-Al-O oxides prepared by calcination of 7:1 Ca-Al-CO(3) LDH phases at 600-700 °C. Furthermore, a relatively high CO(2) capture capability can be achieved, even with gas flows containing very low CO(2) concentrations (CO(2)/N(2) = 10 %). Approximately 95.6 % of the initial CO(2) adsorption capacity of the adsorbent is retained after 30 cycles of carbonation-calcination. TEM analysis indicates that carbonation-promoted CaCO(3) formation in the Ca-Al-O oxide matrix at 600 °C, but a subsequent desorption in N(2) at 700 °C, caused the formation CaO nanocrystals of approximately 10 nm. The CaO nanocrystals are widely distributed in the weakly crystalline Ca-Al-O oxide matrix and are present during the carbonation-calcination cycles. This demonstrates that Ca-Al-O sorbents that developed through the synthesis and calcination of Ca-rich Ca-Al LDH phases are suitable for long-term cyclic operation in severe temperature environments.
Evaluating document clustering for interactive information retrieval (2001)

We consider the problem of organizing and browsing the top ranked portion of the documents returned by an information retrieval system. We study the effectiveness of a document organization in helping a user to locate the relevant material among the retrieved documents as quickly as possible. In this context we examine a set of clustering algorithms and experimentally show that a clustering of the retrieved documents can be significantly more effective than traditional ranked list approach. We also show that the clustering approach can be as effective as the interactive relevance feedback based on query expansion while retaining an important advantage -- it provides the user with a valuable sense of control over the feedback process.
NOVEL LUBRICANTS FOR MAGNETIC THIN FILM MEDIA (1989)

In order to achieve the required Contact Start and Stop (CSS) durability in the rigid disk system, we investigated the relationship between CSS durability and lubricant structures in terms of polar group, chain length, and chain symmetry. The stronger polar group which has a strong intensive adhesion on the disk surface, shows the ability to withstand CSS operations. The long saturated hydrocarbon chain group, with both an extensive cohesion and high packing, leads to higher durability. Based on these findings, we designed and synthesized new lubricants which exhibit further improved performance.
Compensation of position estimation error for precise position-sensorless control of IPMSM based on high-frequency pulsating voltage injection (2017)

This paper proposes a compensation method for precise position-sensorless control using high-frequency pulsating voltage injection and the criterion for applicability of the proposed compensation method is discussed. Theoretical background of the proposed 3-dimensional compensation table as well as the implementation method is described and it is disclosed that the real rotor position and the convergent position should have one-to-one relationship for precise estimation of the rotor position. Also, in the proposed method, additional compensation for inductance harmonics or voltage distortion is not needed, since they are all reflected in the pre-commissioned table. Experimental results including speed and position control validate the proposed compensation method maintaining the position error within ±2°E at all load conditions and rotor positions.
Reduction of Carbonyl Compounds with NaBH<sub>4</sub> under Ultrasound Irradiation and Aprotic Condition (2004)

A variety of carbonyl compounds are reduced to their corresponding alcohols with sodium borohydride under ultrasound irradiation and aprotic condition. Reduction reactions are performed in THF at room temperature or under reflux condition. The product alcohols were obtained in good to excellent yields. The chemoselective reduction of aldehydes over ketones was achieved successfully with this system.
Purification, cloning, and expression of a bovine UDP-GalNAc: polypeptide N-acetyl-galactosaminyltransferase. (1993)

Partial amino acid sequence was obtained from UDP-GalNAc:polypeptide N-acetylgalactosaminyltransferase (polypeptide GalNAc transferase) purified from bovine colostrum. Oligonucleotide primers designed from these sequences were used to amplify and clone a polypeptide GalNAc transferase cDNA from bovine placental mRNA. The cDNA encodes an open reading frame, which is 519 amino acids in length and contains the predicted N-terminal and internal amino acid sequence derived from three Lys-C peptides obtained from the purified protein. There was no sequence homology with the UDP-GalNAc: Fuc alpha 1,2Gal alpha 1,3GalNAc transferase. To verify the authenticity of the clone, the cDNA was cloned in frame with an insulin secretion sequence and was expressed transiently in COS-7 cells. Polypeptide GalNAc transferase activity was detected in the culture medium; no activity was detected in the media of mock-transfected cells. Previous studies have shown that the polypeptide GalNAc transferase from bovine colostrum glycosylates threonine residues more efficiently than serine residues in the same peptide context (O'Connell, B. C., Hagen, F. K., and Tabak, L. A. (1992) J. Biol. Chem. 267, 25010-25018). We found that the cloned polypeptide GalNAc transferase glycosylates the threonine-containing peptide, PPDAATAAPLR, at a 58-fold greater rate than the serine-containing homologue, PPDAASAAPLR. The ratio of the in vitro threonine and serine glycosylation rate is identical for the cloned placental and purified colostral enzymes. It is not known if the preference for threonine over serine is merely context-dependent on the specific amino acids that flank the glycosylation site or if there are discrete threonine- and serine-specific isoforms of this transferase. Alternatively, there may be additional factors required to enhance the glycosylation of serine residues in vivo.
Amino acid separation in a multistage fluidized ion exchanger bed (1993)

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmino acid separation in a multistage fluidized ion exchanger bedMagdiel Agosto, N. H. Linda Wang, and Phillip C. WankatCite this: Ind. Eng. Chem. Res. 1993, 32, 9, 2058–2064Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published inissue 1 September 1993https://pubs.acs.org/doi/10.1021/ie00021a030https://doi.org/10.1021/ie00021a030research-articleACS PublicationsRequest reuse permissionsArticle Views80Altmetric-Citations8LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access optionsGet e-Alertsclose Get e-Alerts
Joint channel estimation and activity detection for multiuser communication systems (2015)

We consider overloaded (non-orthogonal) code division multiple access multiuser wireless communication systems with many transmitting users and one central aggregation node, a typical scenario in e.g. machine-to-machine communications. The task of the central node is to detect the set of active devices and separate their data streams, whose number at any time instance is relatively small compared to the total number of devices in the system. We introduce a novel two-step detection procedure: the first step involves the simultaneous transmission of a pilot sequence used for identification of the active devices and the estimation of their respective channel coefficients. In the second step the payload is transmitted by all active devices and received synchronously at the central node. The first step reduces to a compressed sensing (CS) problem due to the relatively small number of simultaneously active devices. Using an efficient CS recovery scheme (approximate message passing), joint activity detection and channel estimation with high reliability is possible, even for extremely large-scale systems. This, in turn, reduces the data detection task to a simple overdetermined system of linear equations that is then solved by classical methods in the second step.
On woven convolutional codes (1999)

Concatenation of several conventional convolutional encoders is a both powerful and practical method to obtain encoding schemes that are attractive for use in communication systems where very low error probabilities are needed. This thesis is devoted to woven convolutional codes, a construction where the constituent codes are woven together in a manner that resembles the structure of a fabric. A family of active distance measures for convolutional codes is defined. It is shown that the error correcting capability of a convolutional code is determined by the active distances. Lower bounds on the active distances are derived for the ensemble of periodically time-varying convolutional codes. The simplest construction of serially concatenated convolutional codes is considered, viz., a direct cascade of two convolutional encoders. Important structural properties for the cascaded convolutional encoder is shown both for the case of matched and for unmatched rates. Several interesting examples of cascaded convolutional codes are considered and examined. Lower bounds on the active distances and the free distance are derived for the ensemble of periodically time-varying cascaded convolutional codes. Woven convolutional codes can be viewed as a generalization of cascaded convolutional codes. The general construction is called the twill and it is described together with two important special cases, viz., woven convolutional codes with outer and inner warp. The woven convolutional encoder inherits many of its structural properties, such as minimality, from the constituent encoders. Distance properties for the constructions are examined and upper and lower bounds on the free distance are derived. Decoding of woven convolutional codes should be performed iteratively and, for that reason, the BCJR algorithm is rederived. Simulation results show that woven convolutional codes are attractive alternatives to the celebrated Turbo codes. Finally, a review of bounds, such as error exponents and bounds on the active distances, is given for woven convolutional codes.
High-Resolution Temporal Profiling of Transcripts during<i>Arabidopsis</i>Leaf Senescence Reveals a Distinct Chronology of Processes and Regulation     (2011)

Leaf senescence is an essential developmental process that impacts dramatically on crop yields and involves altered regulation of thousands of genes and many metabolic and signaling pathways, resulting in major changes in the leaf. The regulation of senescence is complex, and although senescence regulatory genes have been characterized, there is little information on how these function in the global control of the process. We used microarray analysis to obtain a high-resolution time-course profile of gene expression during development of a single leaf over a 3-week period to senescence. A complex experimental design approach and a combination of methods were used to extract high-quality replicated data and to identify differentially expressed genes. The multiple time points enable the use of highly informative clustering to reveal distinct time points at which signaling and metabolic pathways change. Analysis of motif enrichment, as well as comparison of transcription factor (TF) families showing altered expression over the time course, identify clear groups of TFs active at different stages of leaf development and senescence. These data enable connection of metabolic processes, signaling pathways, and specific TF activity, which will underpin the development of network models to elucidate the process of senescence.
The ethical dimensions of learner support (2007)

Open, distance and elearning institutions of higher education often face ethical issues relating to their distinctive mission, especially where the core role is to open educational opportunities to under‐represented groups while maintaining academic standards. Openness is surely a ‘good thing’; and yet there are often tensions relating to government policies, recruitment, access to technology, curriculum, teaching and student support that sometimes involve uncomfortable trade‐offs. We consider some ethical aspects relating to learner support in the broadest sense, drawing in particular on the experience of The Open University, United Kingdom.
Robust Trajectory Control of 3-axis Arm Systems of Hydraulic Excavators. The Effectiveness of the Control Using a Disturbance Observer. (2000)

It needs the skillful and advanced operational technique in order to operate the arm system of a hydraulic excavator. However the operators have been decreasing because it is tough and dangerous task. Therefore it is required to realize a full autonomous excavator system in the near future. At the first stage to realize an autonomous excavator system, it is necessary to achieve accurate trajector control without respect ot the various nonlinearities and the variation of parameters of a hydraulically driven excavator system. It is reported that a control method using disturbance observer is very effective, and it is also verified that these nonlinearities and the variation of parameters are compensated and that robustness of a system is improved. However, this method is not enough from the point of view of robust stability's. Therefore this study is aimed for the design of Q-filter in the disturbance observer and further improving the accuracy of positioning and trajectory tracking performance where Q-filter plays very important role for the robust stability of a control system. H-infinity control theory is applied in the design of Q-filter. In the experimental results of trajectory control in the 20 ton hydraulic excavator, it is shown that the robust stability and the accuracy of positioning and trajectory tracking are improved by using the disturbance observer designed by making use of H-infinity control theory. Finally, by further addition of PI control, it is confirmed that velocity deviation is decreased and trajectory-tracking performance is improved within ±1cm.
Testicular Expression of Adora3i2 in Adora3 Knockout Mice Reveals a Role of Mouse A3Ri2 and Human A3Ri3 Adenosine Receptors in Sperm* (2010)

Adenosine is a candidate modulator of sperm motility in the female reproductive tract that increases sperm flagellar beat frequency in vitro. Past work suggested that this acceleration may involve equilibrative (ENT) and concentrative (CNT) nucleoside transporters. Here we show that Slc29a1 (ENT-1) is the predominant nucleoside transporter expressed in the mouse testis. Unexpectedly, the beat of Slc29a1-null sperm still accelerates in response to 2-chloro-2'-deoxyadenosine (Cl-dAdo). Moreover, in wild-type sperm neither blockade of CNTs by removal of external Na(+), nor inhibition of ENTs with nitrobenzylthioionosine, prevents acceleration of the sperm beat by Cl-dAdo. In contrast, pertussis toxin produces strong blockade, indicating involvement of a Gα(i/o)-coupled adenosine receptor. Although agonists selective for adenosine receptors A1R, A2aR, and A2bR are ineffective, A3R-selective agonists Cl-IB-MECA and IB-MECA do accelerate the beat. Consistent with this pharmacological profile, the predominant Adora transcripts in the testis are products of the nested Adora3i1 and Adora3i2 genes. Surprisingly, Cl-IB-MECA and Cl-dAdo still accelerate the beat of Adora3i1-null sperm indicating that the remaining Adora3i2 transcript produces an A3R that functions in sperm. When cloned Adora3i2 is heterologously expressed in tsA-201 cells, Cl-dAdo decreases forskolin-evoked accumulation of cAMP, indicating that Adora3i2 specifies a functional A3Ri2 adenosine receptor that couples through Gα(i). Database mining reveals that mouse Adora3i2 is expressed primarily in testis, almost exclusively in spermatids. Expression of the orthologous ADORA3i3 transcript also is most prominent in human testis; presumably producing an A3Ri3 receptor that is functional in sperm and that may be a target for development of male-directed contraceptives.
Immunologic characterization and molecular profile of carcinoembryonic antigen detected by monoclonal antibodies. (1984)

Four distinct monoclonal antibodies, which reacted with CEA preparations but not with nonspecific cross-reacting antigen or with nonspecific cross-reacting antigen 2, were established. Except for monoclonal antibody AS001 , all of these monoclonal antibodies immunoprecipitated molecular forms of 200K and 180K daltons that are not bridged by disulfide bonds. Immunodepletion experiments and sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis revealed that these monoclonal antibodies recognized the same antigenic structure when 125I-CEA preparation was used. Monoclonal antibody AS001 is of particular interest, because this antibody reacted only with a 200K dalton molecule which is a part of the molecules recognized by the other three monoclonal antibodies. The rosette inhibition assay and the immunoprecipitation experiments suggest that each monoclonal antibody recognizes a different antigenic determinant. The antigenic determinants recognized by monoclonal antibodies YK013 and AS001 may be peptides in nature, whereas the determinants recognized by antibodies YK024 or AS005 might be carbohydrate. The radioimmunoassay with monoclonal antibody AS001 was established, and the results clearly indicate that the incidence of positivity for the sera from digestive tract cancer patients and from lung cancer patients obtained by monoclonal antibody AS001 was higher than that obtained by the polyclonal antibody. Monoclonal antibody AS001 was able to detect the corresponding antigen in the sera, which the polyclonal antibody failed to detect. This study therefore suggests that monoclonal antibodies may enhance and improve the diagnostic value in cancer patients with undetectable or lower CEA levels detected by conventional anti-CEA antibodies.
Development of lane-level guidance service in vehicle augmented reality system (2015)

A driver should always pay attention to various situations which he faces inside and outside the car while driving and always keep eyes forward for safe driving. A vehicle augmented reality system provides the driver with safe and convenience information which matched with the real world through HUD. It makes the driver keep eyes forward road and other cars. We have developed the vehicle augmented reality system and various services and tested them on an indoor testbed This system provides driver with the forward situation awareness service, the lane change service, the lane departure service and so on displayed as the vehicle augmented reality. We describe the development contents and results of the developed vehicle augmented reality system focused on the lane-level guidance technology which determines the lane change or the lane departure using route information, road properties, the driving lane information, position, and so on.
Untersuchung des Einflusses des Siliziums bei der Kornfeinung von Aluminium mit Aluminium-Titan-Bor-Vorlegierungen (1979)

Article Untersuchung des Einflusses des Siliziums bei der Kornfeinung von Aluminium mit Aluminium-Titan-Bor-Vorlegierungen was published on June 1, 1979 in the journal International Journal of Materials Research (volume 70, issue 6).
Molecular mechanism of action of virginiamycin-like antibiotics (synergimycins) on protein synthesis in bacterial cell-free systems (1985)

Synergimycins contain two types of components, A and B, which synergistically inhibit in-vivo protein synthesis. In-vitro, both components interact with 50 s ribosomal subunits. B components bind in stoichiometric amounts (KA = 2.5 X 10(6) M-1): the association constant undergoes a ten-fold increase in the presence of A components. The latter inhibitors act in substoichiometric concentration (KA = 0.32 X 10(6) M-1) and produce lasting ribosome damage due to a conformational alteration requiring proteins L7/L12, L8 and L16. Such alteration entails a permanent block of the peptidyltransferase substrate acceptor site, whereby aminoacyl tRNA enzymically bound to ribosomes is released. Macrolides (KA = 7.2 X 10(7) M-1) displace ribosome-bound B components, but they are unable to compete in the presence of A components, which reduce both the affinity of ribosomes for macrolides, and the dissociation rate constant of B components. These findings provide a molecular explanation to the synergistic action of A and B components in-vivo.
ChemInform Abstract: Total Synthesis of Didemnins, A, B,and C. (1988)

Abstract The total synthesis of the title compound (Ia) (didemnin A) is accomplished using conventional condensation procedures starting from the readily accessible units (II) and (III) via the key intermediates (IV) and (VI).
Visualization of large terrains in resource-limited computing environments (1997)

The authors describe a software system supporting interactive visualization of large terrains in a resource-limited environment, i.e. a low-end client computer accessing a large terrain database server through a low-bandwidth network. By large, they mean that the size of the terrain database is orders of magnitude larger than the computer RAM. Superior performance is achieved by manipulating both geometric and texture data at a continuum of resolutions, and, at any given moment, using the best resolution dictated by the CPU and bandwidth constraints. The geometry is maintained as a Delaunay triangulation of a dynamic subset of the terrain data points, and the texture compressed by a progressive wavelet scheme. A careful blend of algorithmic techniques enables the system to achieve superior rendering performance on a low-end computer by optimizing the number of polygons and texture pixels sent to the graphics pipeline. It guarantees a frame rate depending only on the size and quality of the rendered image, independent of the viewing parameters and scene database size. An efficient paging scheme minimizes data I/O, thus enabling the use of the system in a low-bandwidth client/server data-streaming scenario, such as on the Internet.
The Skin as a Drug-Metabolizing Organ (1978)

(1978). The Skin as a Drug-Metabolizing Organ. Drug Metabolism Reviews: Vol. 8, No. 2, pp. 319-343.