gebhart/patrepeval huggingface dataset:
The H2 + Cl2 explosion as a chemical analogue of the photoelectric effect: A true quantum mechanical demonstration (1990)

ADVERTISEMENT RETURN TO ISSUEPREVDemoNEXTThe H2 + Cl2 explosion as a chemical analogue of the photoelectric effect: A true quantum mechanical demonstrationKerro Knox Cite this: J. Chem. Educ. 1990, 67, 10, 897Publication Date (Print):October 1, 1990Publication History Received3 August 2009Published online1 October 1990Published inissue 1 October 1990https://doi.org/10.1021/ed067p897RIGHTS & PERMISSIONSArticle Views131Altmetric-Citations-LEARN 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 InReddit PDF (883 KB) Get e-Alerts Get e-Alerts
Molecular Characterization of EG-VEGF-mediated Angiogenesis: Differential Effects on Microvascular and Macrovascular Endothelial Cells (2010)

Endocrine gland derived vascular endothelial growth factor (EG-VEGF) also called prokineticin (PK1), has been identified and linked to several biological processes including angiogenesis. EG-VEGF is abundantly expressed in the highest vascularized organ, the human placenta. Here we characterized its angiogenic effect using different experimental procedures. Immunohistochemistry was used to localize EG-VEGF receptors (PROKR1 and PROKR2) in placental and umbilical cord tissue. Primary microvascular placental endothelial cell (HPEC) and umbilical vein-derived macrovascular EC (HUVEC) were used to assess its effects on proliferation, migration, cell survival, pseudovascular organization, spheroid sprouting, permeability and paracellular transport. siRNA and neutralizing antibody strategies were used to differentiate PROKR1- from PROKR2-mediated effects. Our results show that 1) HPEC and HUVEC express both types of receptors 2) EG-VEGF stimulates HPEC's proliferation, migration and survival, but increases only survival in HUVECs. and 3) EG-VEGF was more potent than VEGF in stimulating HPEC sprout formation, pseudovascular organization, and it significantly increases HPEC permeability and paracellular transport. More importantly, we demonstrated that PROKR1 mediates EG-VEGF angiogenic effects, whereas PROKR2 mediates cellular permeability. Altogether, these data characterized angiogenic processes mediated by EG-VEGF, depicted a new angiogenic factor in the placenta, and suggest a novel view of the regulation of angiogenesis in placental pathologies.
Enhancing Security in 802.11 and 802.1 X Networks with Intrusion Detection (2006)

The convenience and low cost of 802.11-based Wireless Local Area Networks (WLANs) complemented with 802.1 X authentication has led to widespread deployment in the consumer, industrial and military sectors. The combination of wireless signals radiating further than the intended coverage area, flaws in 802.11's basic security mechanisms and vulnerabilities found in 802.1 X have been widely publicized. Military bases and navy ships are open targets for wireless attacks. Wireless Intrusion Detection System (WIDS), provides an additional (external) layer of security by combining intrusion detection, fire walling, packet filtering and determining the physical location of the intruder.
Structural Characterization of Isomeric Dimers from the Oxidative Oligomerization of Catechol with a Biomimetic Catalyst (2006)

In a previous paper, it has been reported about the formation of catechol di-, tri- and tetramers within an oxidative polymerization catalyzed by synthetic water-soluble iron-porphyrin as an efficient alternative to bio-labile natural peroxidase. It has also been demonstrated the occurrence of both C-C and C-O-C coupling mechanisms. However, since the coupling products were determined by mass spectroscopy, the exact bonding position could not have been precisely ascertained for the C-C bonded isomeric dimers that are the dominant products of catechol oligomerization. Therefore, here isolation and characterization of catechol isomeric dimers, obtained by oxidative coupling under the catalysis of a synthetic iron-porphyrin, have been done by NMR spectroscopy
Assembly of Carbon Nanotube Sheets (2011)

Over the past decades, carbon nanotubes (CNTs) have been actively explored as building blocks for next-generation electronics (Tans et al., 1998; Bachtold et al., 2001; Misewich et al., 2003), optoelectronics, and sensors (Kong et al., 2000; Xia et al., 2003; T. Zhang, 2008), including flexible and transparent devices ( Ju et al., 2007) as well as stretchable devices (Xu et al., 2011). A critical step in constructing CNT-based devices is assembly of CNTs on a substrate or free-standing for device fabrication, which include alignment, density control, and transfer. Scalable and controlled assembly of CNTs synthesized with diverse methods (e.g., solution fabrication or solid-state fabrication methods) on diverse substrates (e.g., silicon, plastics, rubbers, etc) or free-standing presents a major fabrication challenge that must be overcome if CNTs are to be utilized in practical applications. For assembling CNTs into thin films (or called sheet, buckypaper), there are several different methods or processes in different conditions (e.g., solution or solid-state processes) (Hu et al., 2010). Solution processes start with the CNTs in powder form; the powder is dispersed in an appropriate solvent with or without functionalization. The CNT films (buckypapers) are usually made using versions of the ancient art of paper making, by typically long-time filtration of nanotubes dispersed in solvent and peeling the dried nanotubes as a layer from the filter (Rinzler et al., 1998; Endo et al., 2005). Buckypaper normally has a laminar structure with a random orientation of the bundles of the nanotubes in the plane of the film (Berhan et al., 2004). Interesting variations of the filtration route provide ultra-thin nanotube sheets that are highly transparent and highly conductive (Wu et al., 2004; Hu et al., 2004). While filtration-produced sheets are normally isotropic within the sheet plane, sheets having partial nanotube alignment result from applying high magnetic fields during filtration (Fischer et al., 2003). In other important advances, nanotube films have been fabricated by Langmuir-Blodgett deposition (Y. Kim et al., 2003), casting from oleum (Sreekumar et al., 2003), coating (Ago et al., 1999; Dan et al., 2009), and printing (Zhou et al., 2006; Unidym Inc, 2007). The solid-state processes generally have two approaches. One is to synthesize CNTs by floating catalyst chemical vapor deposition (CVD), either to deposit CNTs on a substrate inside the CVD chamber or to collect the CNT aerogel outside of the chamber on a special substrate and then densify it into a film (Y. Li et al., 2004; Martin, 2010). The catalysts are with the CNTs and the CNTs in the film are usually disoriented. The optimized process control lowers the impurities to less than 5 wt% in the film and a 1.2 meter wide and 10 meter long CNT film has been made (Nanocomp Tech. 2010). The other approach is to
QuickMatch--a very fast algorithm for the assignment problem (1993)

In this paper, we consider the linear assignment problem defined on a bipartite network G = ( U V, A). The problem may be described as assigning each person in a set IU to a set V of tasks so as to minimize the total cost of the assignment. The cost of assigning person i to task j is cij if (i, j) E A and is infinite otherwise. This paper describes a new algorithm called QuickMatch for solving the assignment problem. QuickMatch is based on the successive shortest path (SSP) algorithm for the assignment problem, which in turn is a modification of Kuhn&apos;s primal dual algorithm. However, we have added several natural heuristics that speed up the performance of the standard successive shortest path algorithm by several orders of magnitude. We present some theoretical justifications as to why the algorithm&apos;s performance is superior in practice to the usual SSP algorithm, and we provide computational support as well. In addition, the theoretical analysis and computational testing supports (but does not prove) the hypothesis that QuickMatch runs in linear time (i.e., in expected time O(m)) on randomly generated sparse assignment problems. 1
Tunable erbium-doped fiber ring laser using acousto-optic tunable filter (2001)

We have developed discretely tunable erbium-doped fiber ring lasers using an AOTF. AOTF can realize single-mode lasers and multiwavelength lasers, both of which have many attractive characteristics as a flexible source for WDM transmission systems.
Pain in Infants, Children, and Adolescents (1993)

Pain in Infants, Children,& Adolescents: An OverviewDevelopmental Neuroanatomy & Neurophysiology of PainLong term consequences of painDevelopmental Considerations in the Clinical Pharmacology of AnalgesicsPsychological Aspects of Pain PerceptionDevelopment of Psychological Responses to Pain and Assessment of Pain in Infants and ToddlersAspects and Measurement of Pain in School-Age ChildrenCultural Considerations in Children's PainEthical Issues in Pediatric Pain ManagementNonsteroidal Anti-inflammatory Drugs in Pediatric Pain ManagementOpioid Agonists and AntagonistsAdjuvant analgesics, anticonvlsants, and antidepressantsLocal AnestheticsNovel Techniques of Analgesic DeliveryPsychiatric Assessment and Management of Pediatric PainPsychological Treatment of Pain in Children and AdolescentsHypnotic Interventions for Children in PainNeurosurgical Procedures for the Relief of Pain in Children and AdolescentsRegional Anesthesia - AcuteRegional Anesthesia - ChronicNursing Interventions for Pain Control in ChildrenPhysical Therapy Management of Pain in ChildrenComplementary Medicine and AcupunctureMultidisciplinary Programs for Acute and Chronic PainManagement of Pain in Sickle Cell DiseaseManagement of Pain in Childhood Cancer/Palliative and End of Life CareProcedure Pain and SedationMusculoskeletal PainPain in the Developmentally DisabledNeuropathic PainBurn PainPain in the Emergency DepartmentPain in the NICUCommon pain problemsHeadacheRecurrent Abdominal PainChest PainColicFacial PainPediatric Pain from a Global PerspectivePain in the PICUThe economics of pediatric painPain Associated Disability Inde
A Real Time Spatial/Temporal/Motion Integrated Surveillance System in Compressed Domain (2008)

We designed a real time moving object extraction and behavior analysis system to detect if any abnormal behavior like intrusion, halt, and wall climbing happened. Much work in the area of motion based video object segmentation is being done in the pixel domain which exploits the visual attributes and motion information. Given most existing images and videos stored in the compressed form, the specific manipulation algorithms can be applied to the compressed streams without full decoding of the compressed images/videos. In this paper, we could produce motion masks from I and P frames in MPEG video. Then, motion vectors decoded directly from P frames could be utilized to do object extraction. By clustering motion vectors conforming to the same motion, we could extract the moving regions. If moving regions are connected closely and of the same direction, they are claimed to be of the same moving object. Following the motion vectors in consecutive P frames, we could track the moving objects. A confidence is defined from these matched blocks. Finally, a couple of criterions are defined for object behavior analysis whether they intrude a monitored area, halt on road, or climb wall. Experimental results are given to demonstrate the feasibility of our system.
Porphyrin-embedded organosilicate materials for ammonia adsorption (2012)

This study describes the application of porphyrin-embedded porous organosilicate materials to the adsorption of ammonia gas. Organosilicate scaffolds were synthesized through a surfactant-templating process combined with a phase separation technique. The structure offers a macro-textured scaffold to facilitate flow through the sorbent material and provide enhanced access to the available surface area provided by a combination of micro- and mesopores distributed over a range of sizes. The materials were grafted post-synthesis to provide sites for covalent immobilization of porphyrins. These porphyrins were utilized for incorporation of metal sites into the organosilicate materials. The removal of ammonia was evaluated for a number of materials incorporating copper metalloporphyrins of varied structure at varied loading levels. Results have been compared to removal of ammonia by a carbon material. Copper deuteroporphyrin IX bis-ethylene glycol provided the strongest interactions with ammonia. High loading levels of this porphyrin within the sorbent structure showed increasing evidence of stacking and did not improve the performance of the material.
Hsp90 Maintains the Stability and Function of the Tau Phosphorylating Kinase GSK3β (2007)

Hyperphosphorylation of tau leading to aggregated tau and tangle formation is acommon pathological feature of tauopathies, including Alzheimer's disease. Abnormalphosphorylation of tau by kinases, in particular GSK3β, has been proposed as a pathogenicmechanism in these diseases. In this study we demonstrate that the heat shock protein 90(Hsp90) maintains the stability and function of the GSK3β. By using both rat primarycortical neurons and COS-7 cells, we show that Hsp90 inhibitors lead to a reduction of theprotein level of GSK3β, and that this effect is associated with both a decrease in tauphosphorylation at putative GSK3β sites and an induction in heat shock protein 70 (Hsp70)levels. We further show that Hsp90 associates with the GSK3β regulating its stability andfunction and preventing its degradation by the proteasome.
A Novel Approach to Identify Spatio-Temporal Crime Pattern in Dhaka City (2016)

Street crime is a prevalent problem in developing countries like Bangladesh. Though this problem has been identified long before, no visible remedy or action can be seen to overcome or combat these street crimes in one of the most populated mega-cities, Dhaka, Bangladesh, of the world. In this paper, we propose a novel spatio-temporal street crime prediction model that exploits the historical street crime data of Dhaka city to predict the possibility of a crime in a particular region at a specific time. Our model captures both space and time proximity of past crimes while predicting a future crime. Experimental evaluation shows that our spatiotemporal prediction model can predict a future crime with 79.24% sensitivity and 68.2% specificity. As a proof of concept we develop an Android application that alerts a user about the possibility of different crimes in a place at a particular time.
Post‐translational modification of heterologously expressed <i>Streptomyces</i> type II polyketide synthase acyl carrier proteins (1997)

Expression in Escherichia coli of Streptomyces acyl carrier proteins (ACPs) associated with polyketide biosynthesis using the pT7-7 expression system of Tabor and Richardson led to the production predominantly of inactive apo-proteins lacking the 4'-phosphopantetheinyl prosthetic group essential for polyketide synthase activity. Modification of growth conditions led to an increase of production of active holo-protein for the actinorhodin (act) ACP, but this technique was ineffective for oxytetracycline (otc) and griseusin (gris) ACPs. Labelling experiments revealed that a low level of otc ACP expressed prior to induction was produced mainly as active holo-protein, while post-induction 15N-labelled protein was almost exclusively in the apo-ACP form. Limiting endogenous holo-acyl carrier protein synthase (ACPS) concentration was implicated as responsible for low apo-ACP to holo-ACP conversion, rather than limiting substrate (coenzyme A) and cofactor (Mg2+) concentrations. Co-expression of act and gris ACPs with ACPS in E. coli led to high levels of production of active holo-ACPs and ACPS. We have also made the significant observation that ACPS is able to transfer acylated CoA moieties to act apo-ACP.
Traps of carnivorous pitcher plants as a habitat: composition of the fluid, biodiversity and mutualistic activities (2010)

There is strong evidence that CPPs influence their phytotelm. Two strategies can be distinguished: (1) Nepenthes and Cephalotus produce acidic, toxic or digestive fluids and host a limited diversity of inquilines. (2) Genera without efficient enzymes such as Sarracenia or Heliamphora host diverse organisms and depend to a large extent on their symbionts for prey utilization.
Probing optical anisotropy of nanometer-thin van der waals microcrystals by near-field imaging (2017)

Most van der Waals crystals present highly anisotropic optical responses due to their strong in-plane covalent bonding and weak out-of-plane interactions. However, the determination of the polarization-dependent dielectric constants of van der Waals crystals remains a nontrivial task, since the size and dimension of the samples are often below or close to the diffraction limit of the probe light. In this work, we apply an optical nano-imaging technique to determine the anisotropic dielectric constants in representative van der Waals crystals. Through the study of both ordinary and extraordinary waveguide modes in real space, we are able to quantitatively determine the full dielectric tensors of nanometer-thin molybdenum disulfide and hexagonal boron nitride microcrystals, the most-promising van der Waals semiconductor and dielectric. Unlike traditional reflection-based methods, our measurements are reliable below the length scale of the free-space wavelength and reveal a universal route for characterizing low-dimensional crystals with high anisotropies.
Red vertical cavity surface emitting lasers (VCSELs) for consumer applications (2008)

There are many potential applications of visible, red (650nm - 690nm) vertical cavity surface emitting lasers (VCSELs) including high speed (Gb) communications using plastic optical fiber (POF), laser mouse sensors, metrology, position sensing. Uncertainty regarding the reliability of red VCSELs has long been perceived as the most significant roadblock to their commercialization. In this paper we will present data on red VCSELs optimized for performance and reliability that will allow exploitation of this class of VCSEL in a wide range of high volume consumer, communication and medical applications. VCSELs operating at ~665nm have been fabricated on 4" GaAs substrates using MOCVD as the growth process and using standard VCSEL processing technology. The active region is AlGaInP-based and the DBR mirrors are made from AlGaAs. Threshold currents are typically less than 2mA, the devices operate up to >60C and the light output is polarized in a stable, linear characteristic over all normal operating conditions. The 3dB modulation bandwidth of the devices is in excess of 3GHz and we have demonstrated the operation of a transceiver module operating at 1.25Gb/s over both SI-POF and GI-POF. Ageing experiments carried out using a matrix of current and temperature stress conditions allows us to estimate that the time to failure of 1% of devices (TT1%F) is over 200,000h for reasonable use conditions - making these red VCSELs ready for commercial exploitation in a variety of consumer-type applications. Experiments using appropriate pulsed driving conditions have resulted in operation of 665nm VCSELs at a temperature of 85°C whilst still offering powers useable for eye-safe free space and POF communications.
RESPECT: a real-time emulator for service performance evaluation of cellular neTworks (2006)

The evaluation and optimization of packet service performance in wireless networks is a complex process, considering the number of heterogeneous entities and protocols that are involved. An emulation platform comes at hand for such performance investigations as it provides a means to see the performance from an end-2-end (E2E), user-perceived Quality Of Service (QoS) point of view. In this paper, the design and implementation of RESPECT, an easily configurable network emulator is described. RESPECT was originally geared towards Universal Mobile Communications System (UMTS) networks, but thanks to its modular and scalable design, it is being extended for generic heterogeneous networks. Using RESPECT, QoS studies can be carried out to study the behavior of different services in different network conditions, identify generalized service dependent performance metrics for already existing services and predict network environment requirements for future services.
Gaining and losing sections of horizontal wells (2001)

The flux along a horizontal well in uniform flow is examined using an analytic three‐dimensional, steady model. Wells with uniform head and low pumping rates have gaining sections along which water enters the well and losing sections along which water exits. Such a well may provide a conduit for contaminated groundwater to be drawn into the well, conveyed a large distance, and injected into an uncontaminated region of an aquifer. Dimensionless ratios of the well's length L and radius R , aquifer thickness H , and uniform flow rate U are developed to quantify the minimum pumping rate Q min at which no losing section occurs. The ratio Q min /( ULH ) is presented as a nomograph using R / H and L / H for placement parallel to flow and is 6π R / H for placement perpendicular to flow, and a parabolic relationship between these limiting cases is developed for placement oblique to flow. Capture zone geometry is quantified using Q min /( ULH ).
Affinity labeling of escherichia coli DNA-dependent RNA polymerase with 5-formyl-1-(α-D-ribofuranosyl)uracil 5'-triphosphate (1976)

5-Formyl-1-(alpha-D-ribofuranosyl)uracil 5'=triphosphate has been used to affinity label E. coli DNA-dependent RNA polymerase. It is a noncompetitive inhibitor of the enzyme with Ki=0.54 mM. A short preincubation of the enzyme and alpha-fo5UTP is required to achieve maximum inhibition, and the entent of the inhibition is dependent upon the alpha-fo5UTP concentration. When a preincubation mixture of alpha-fo5UTP/enzyme is diluted, the enzyme regains activity with time showing that the inhibition is reversible, presumably occurring by Schiff base formation between an amino group on the enzyme and the formyl group. Upon sodium borohydride reduction of an enzyme/alpha-fo5UTP preincubation mixture the enzyme is irreversibly inhibited. alpha-fo5UTP is more effective in inhibiting the enzyme than alpha-fo5U, and the inhibition is decreased by the presence of ATP, UTP, or GTP in the preincubation mixture, suggesting that inhibition is occurring at a triphosphate binding site. The stoichiometry of binding of alpha-fo5UTP to the enzyme was determined using the gamma-32P-labeled derivative. After a 20-s preincubation of enzyme/alpha-fo5UTP followed by NaBH4 reduction the stoichiometry of binding was 1.1:1 (alpha-fo5UTP bound: inactivated enzyme), and this rose to 2.42:1 after a 10-min preincubation. After a 20-s preincubation the [gamma-32P]-alpha-fo5UTP was shown to be located on the beta subunit of RNA polymerase by cellulose acetate electrophoresis in 6 M urea.
Multi-Frequency VSOP and VLBA Polarization Observations of 3C 279 and 3C 345 (2003)

This contribution presents preliminary results from coordinated polarization sensitive VSOP and VLBA imaging of the blazars 3C~279 and 3C~345 at multiple frequencies.