gebhart/patrepeval huggingface dataset:
Modélisation de l'effet de la compression d'un renfort de mats de fibres sur la variation de sa perméabilité (2002)

Resume Actuellement, le moulage des pieces en materiaux composites par transfert de resine (RTM) suscite beaucoup l'interet des industriels. C'est pourquoi, plusieurs equipes de recherche se penchent sur la modelisation et la simulation du procede RTM. Le parametre determinant de la simulation du remplissage par la resine d'un moule contenant une preforme de fibres est la permeabilite de cette derniere. Cependant, l'operation de preformage et la fermeture du moule causent la compression de la preforme variant, ainsi, sa permeabilite. L'objet de cette etude est la modelisation de l'effet de la compression d'un renfort de mats de fibres sur la variation de sa permeabilite. Le probleme est traite en etudiant la compression du renfort de mats de fibres impregne de resine selon deux approches : analytiquement, en supposant que la permeabilite du renfort reste constante, et experimentalement. Sur un meme graphe, on trace les courbes de compression analytiques pour differentes permeabilites du renfort et la courbe experimentale. Les points d'intersection de cette derniere avec les courbes analytiques, permettent de tracer la variation de la permeabilite du renfort en fonction de son taux de compression. Une loi de variation exponentielle a ete trouvee. Celle-ci est utilisee pour calculer la permeabilite effective du renfort a l'etat comprime, permettant d'ameliorer la precision de la simulation numerique du procede RTM.
An Effective Secondary Electron Emission Suppression Treatment For Copper MDC (1993)

Untreated oxygen-free, high-conductivity (OFHC) copper, commonly used for MDC electrodes, exhibits relatively high secondary electron emission characteristics. This paper describes a specialized ion-bombardment procedure for texturing copper surfaces which sharply reduces the emission properties relative to untreated copper. The resulting surface is a particle-free, robust, uniformly highly-textured all-metal structure. The use of this process requires no modifications to copper machining, brazing, or other MDC normal fabrication procedures. The flight TWT for a planned NASA deep space probe, the Cassini Mission, will incorporate copper MDC electrodes treated with the method described here.
Paper ID ICLASS06-131 BALLISTIC IMAGING OF THE NEAR FIELD FOR JETS IN GASEOUS CROSSFLOW (2006)

This paper focuses upon steady, liquid sprays in crossflow, relevant to fuel injection within a lean, premixed, prevaporized (LPP) gas turbine duct for example. The characteristic geometry for an LPP duct incorporates the injection of liquid-fuel into a high temperature and pressure air stream as depicted schematically in Figure 1. The balance of aerodynamic drag, liquid inertia, tension, and viscous forces induces both deflection and deformation of the jet column. Deflection leads to a curved liquid-jet profile, breaking the liquid into large segments near the point of curvature (called column breakup), and subsequent fragmentation. In contrast, deformation increases the frontal cross-section of the jet and increases the drag, which leads to stripping of smaller ligaments and fragments directly from the (called surface stripping). While the onset of jet-column breakup is well characterized, the time required to complete the process is more difficult to measure with conventional techniques due to the optical density in this region. Even the most advanced models still do not account for other important structural features, such as wake effects, and this results in an under prediction of the volume flux in the near-wall region. Dense spray effects on breakup and atomization are also typically ignored, leading to uncertainties in the near field. Errors in the near field can be important when fuel injection is closely coupled to an anchored flame. These problems in understanding remain because there have been no experimental observations of primary breakup of the liquid core in the dense spray region, because such a core is obscured by a dense fog of droplets. Ballistic imaging can meet this need, providing high resolution, single-shot images of the liquid core in a dense spray. A time-gated ballistic imaging instrument is used here to obtain high spatial resolution, single-shot images of the liquid core in a water spray issuing into a gaseous crossflow. We describe application of the diagnostic technique and present images and statistics for various jet in crossflow experimental conditions (e.g. different Weber numbers). Series of these images reveal a near-nozzle flow field undergoing breakup and subsequent droplet formation via stripping. Signal from droplets smaller than the resolution limit of the imaging system is visible in the areas between resolved droplets. This unresolved signal is essentially a measure of local extinction in the image. It is important to note that apparent features inside the jet and droplets cannot be interpreted as extinction features or refraction features as normally seen in shadowgraphy. Apparent features in the jet and droplets are due to noise sources such as edge diffraction. An extension of ballistic imaging to detect the velocity of the liquid gas interface of a droplet is also demonstrated. In addition, we describe a simple extension that will provide images of the force vectors that act to break apart intact liquid features in sprays.
Structural and functional studies of D109A human αB-crystallin contributing to the development of cataract and cardiomyopathy diseases (2021)

αB-crystallin (heat shock protein β5/HSPB5) is a member of the family of small heat shock proteins that is expressed in various organs of the human body including eye lenses and muscles. Therefore, mutations in the gene of this protein (CRYAB) might have many pathological consequences. A new mutation has recently been discovered in the α-crystallin domain of this chaperone protein which replaces aspartate 109 with alanine (D109A). This mutation can cause myofibrillar myopathy (MFM), cataracts, and cardiomyopathy. In the current study, several spectroscopic and microscopic analyses, as well as gel electrophoresis assessment were applied to elucidate the pathogenic contribution of human αB-crystallin bearing D109A mutation in development of eye lens cataract and myopathies. The protein oligomerization, chaperone-like activity and chemical/thermal stabilities of the mutant and wild-type protein were also investigated in the comparative assessments. Our results suggested that the D109A mutation has a significant impact on the important features of human αB-crystallin, including its structure, size of the protein oligomers, tendency to form amyloid fibrils, stability, and chaperone-like activity. Given the importance of aspartate 109 in maintaining the proper structure of the α-crystallin domain, its role in the dimerization and chaperone-like activity, as well as preserving protein stability through the formation of salt bridges; mutation at this important site might have critical consequences and can explain the genesis of myopathy and cataract disorders. Also, the formation of large light-scattering aggregates and disruption of the chaperone-like activity by D109A mutation might be considered as important contributing factors in development of the eye lens opacity.
Webb, S. David (editor). PLEISTOCENE MAMMALS OF FLORIDA. The University Presses of Florida, Gainesville, x + 270 pages, illus., tables, 1974. Price $12.00 (1975)

Webb, S. David (editor). Pleistocene Mammals of Florida. The University Presses of Florida, Gainesville, x + 270 pages, illus., tables, 1974. Price $12.00 Get access Webb S. David (editor). Pleistocene Mammals of Florida. The University Presses of Florida, Gainesville, x + 270 pages, illus., tables, 1974. Price $12.00. David D. Gillette David D. Gillette Department of Geology, Bryn Mawr College, Bryn Mawr, Pennsylvania 19010Tall Timbers Research Station, Route 1, Box 160, Tallahassee, Florida 32303 Search for other works by this author on: Oxford Academic Google Scholar Journal of Mammalogy, Volume 56, Issue 3, 29 August 1975, Pages 723–724, https://doi.org/10.2307/1379501 Published: 29 August 1975
Pre-formed iron-thiosemicarbazone chelates as ribonucleotide reductase inhibitors (2003)

Pre-formed iron(III) complexes of naphthoquinone thiosemicarbazone ligands, viz. 2-hydroxy-1,4-naphthoquinone-1-thiosemicarbazone (HNQTSC) and 2-thiosemicarbazido-1,4-naphthoquinone (TSCNQ) have been synthesized, characterized by various physical techniques and their potential for inhibition of ribonucleotide reductase (RDR) enzyme, crucial for DNA synthesis, has also been evaluated. It is observed that the pre-formed iron(III) complexes possess higher RDR inhibitory activity than the respective free ligands.
Hydrocarbon composition and structural parameters of resins and asphaltenes of naphthenic oils of northern West Siberia (2017)

Abstract The composition of saturated and aromatic hydrocarbons and the structural-group characteristics of resins and asphaltenes in four oils of northern West Siberia have been studied. As follows from the distribution of hydrocarbons, the Cenomanian oils (pools in the beds PK and K2c) of the Russkoe, Barsukovskoe, and Pangodinskoe fields are naphthenic and the Pangodinskoe oil sample from the Lower Cretaceous pool (bed BN9) is methanoic. The hydrocarbon composition pattern of the saturated fraction and the characteristics of the heterocyclic components of these oils point to their formation from dispersed organic matter of mixed genesis in the oil window. Hence, the oil source rocks are localized at depths much greater than the present-day level of the oil pools. Secondary (cryptohypergene) alterations (oxidation and biodegradation) in the shallow-depth oils determined their current predominantly naphthenic composition and considerably hamper reconstruction of the types of initial dispersed organic matter. We assume that the mixed genetic type of the studied oils is not only due to their heterogeneous source but also due to the reorganization of primary oil pools at the Cenozoic stage of tectogenesis. The Cenomanian Russkoe and Pangodinskoe naphthenic oils are saturated with adamantoids, which can be selectively accumulated during biodegradation.
Bulk Material Properties of Beta–Bulge Peptide Hydrogels For Tissue Engineering (2008)

Hydrogels are porous, physically rigid, three dimensional matrices primarily composed of water which show promise as scaffolds to aid in tissue regeneration. 1,2 The Schneider laboratory has developed a class of peptides that adopt β‐hairpin structure and self‐assemble into a hydrogel in response to specific stimuli. 3,4,5,6 The peptide MAX8 consists of alternating valine and lysine residues on each β‐strand flanking a type II′ β‐turn (‐V D PPT‐) with a glutamic acid at position 15. The kinetics of self‐assembly for the MAX8 under cellular encapsulation conditions are fast enough to result in homogeneous gel‐cell constructs. 7 MAX8 must be prepared by chemical synthesis due to the unnatural amino acid D Proline in the turn region. A new sequence, BBH8, was designed to contain all natural amino acids which can possibly be overexpressed. BBH8 was first chemically synthesized and its bulk material properties characterized under physiological and cell culture conditions. Data show that BBH8 behaves analogously to MAX8. Preliminary data also demonstrate that chondrocytes can be encapsulated with homogeneous cellular distribution and remain viable in the network for at least 3 hours. This suggests that BBH8 is an excellent candidate for tissue engineering and possible production by fermentation. Funding provided by NSF CHEM0348323, NIH R01 DE016386 ‐01, and the Howard Hughes Medical Institute.
1A1-D03 An Ungrounded Pulling Force Feedback Device using Periodical Vibration-Impact(Haptic Interface) (2012)

This paper presents a novel ungrounded force feedback device which makes a user feel a sensation as if a pulling force is displayed by utilizing non-linear characteristics of human perception. The force feedback device is mainly composed of a spring-mass system and a voice coil motor (VCM). A weight, which connects to the VCM through the spring, hits against a wall periodically to generate a one-directional impulsive force. Then, a user grasping the device perceives the pulling force to the designed direction despite a real constant force is not displayed. The device is 140 x 41.5 x 41.5 mm3 with total mass of 230 g. A sensitivity of the pulling force perception were evaluated and presented in this paper.
p53 IMMUNOHISTOCHEMICAL AND GENETIC ALTERATIONS ARE PERSISTENT PROSTATE CARCINOMA ASSOCIATED AT HIGH INCIDENCE WITH POST-IRRADIATED LOCALLY (1996)

Purpose: Several reports have shown that cells with p53 mutations display increased resistance to ionizing radiation, a treatment often used clinically for localized prostate carcinoma. Materials and Methods: Totals of 18 post-irradiated locally recurrent prostatic carcinoma specimens and 25 (no radiation) stage D1 node-positive (TxN+MO) primary prostatic carcinoma specimens were tested for p53 immunoreactivity by immunohistochemistry. Of the 18 post-radiation locally recurrent prostatic carcinomas 10 were further analyzed by single strand conformational polymorphism to assess the validity of using this immunohistochemistry approach in irradiated tissue for detecting p53 alterations. Specimens showing p53 alterations by single strand conformational polymorphism were subjected to nucleotide sequence analysis or tested for loss of heterozygosity at a locus within the p53 gene. Results: Of the 25 stage TxN+MO prostatic carcinomas without radiation 5 (20%) were immunoreactive (consistent with the reported incidence of positive immunoreactivity in clinicaVsurgica1 stage TxN+MO primary prostatic carcinomas). In contrast, 13 of 18 post-radiation locally recurrent prostatic carcinoma specimens (72%) were immunoreactive. Multivariate logistic regression analysis showed no dependence of p53 immunoreactivity to grade, stage or androgen status in the post-radiation locally recurrent prostatic carcinoma group, while 8 of 10 hormone naive prostatic carcinoma specimens (80%) were immunoreactive. The temporal relationship between p53 alterations and radiotherapy was assessed. Pre-irradiation prostatic carcinomas available from 5 patients with immunoreactive post-radiation locally recurrent disease were analyzed and all were immunoreactive. Conclusions: p53 Alteration in localized prostatic carcinoma is uncommon. Our study confirms others in that even aggressive locally advanced nonirradiated primaries (stage TxN +MO) contain only a 20%' incidence of p53 alterations. However, our study demonstrates that p53 alterations are found in the preponderant majority of post-radiation locally recurrent prostatic carcinoma specimens. Limited evaluation of pretreatment prostatic carcinoma biopsies uniformly documented the presence of p53 alterations before ionizing radiation, thereby demonstrating that p53 alteration was already present and was not radiation-induced or only correlated with late stage disease. This finding suggests a potential for p53 immunoreactivity to be used as a pretreatment marker that might predict local treatment failure with ionizing radiation. Large scale prospective trials would appear warranted to evaluate conclusively the potential prognostic applicability of p53 pre-screening before enrollment in definitive radiotherapy.
Noncontact Atomic Force Microscopy. Possibility of NC-AFM Imaging of Surface Magnetic Structure. (2002)

Many kinds of scanning probe microscopes have been proposed for imaging surface magnetic structures. Theoretical calculations predict that the detection of the short-range magnetic interaction such as exchange interaction reveals the magnetic structures on an atomic scale. The non-contact atomic force microscopy (NC-AFM) detecting the short-range magnetic interaction is called exchange force microscopy (EFM). In order to detect the exchange interaction between a magnetic tip and a sample, we performed NC-AFM imaging of an antiferromagnet NiO(001) surface using a ferromagnetic Fe-coated tip. To discuss the interaction atomically resolved images obtained are analyzed by the superposition method. The results of the analysis demonstrates that the spin configuration revealed from the superimposed images coincides with the expected one of the NiO(001) surface. To evaluate the corrugation amplitude of the atoms, we introduced the topographic asymmetry, which indicates that the short-range magnetic interaction between the Fe-coated tip and sample can be detected by NC-AFM.
Feature Tracking and Synchronous Scene Generation with a Single Camera (2016)

This paper shows a method of tracking feature points to update camera pose and generating a synchronous map for AR (Augmented Reality) system. Firstly we select the ORB (Oriented FAST and Rotated BRIEF) [1] detection algorithm to detect the feature points which have depth information to be markers, and we use the LK (Lucas-Kanade) optical flow [2] algorithm to track four of them. Then we compute the rotation and translation of the moving camera by relationship matrix between 2D image coordinate and 3D world coordinate, and then we update the camera pose. Last we generate the map, and we draw some AR objects on it. If the feature points are missing, we can compute the same world coordinate as the one before missing to recover tracking by using new corresponding 2D/3D feature points and camera poses at that time. There are three novelties of this study: an improved ORB detection, which can obtain depth information, a rapid update of camera pose, and tracking recovery. Referring to the PTAM (Parallel Tracking and Mapping) [3], we also divide the process into two parallel sub-processes: Detecting and Tracking (including recovery when necessary) the feature points and updating the camera pose is one thread. Generating the map and drawing some objects is another thread. This parallel method can save time for the AR system and make the process work in real-time.
New techniques for early detection of lung cancer (2003)

The resurgence of interest in lung cancer screening and the application of new techniques for the management of early cancer have raised various issues regarding this global epidemic. In previous randomised clinical trials, the use of conventional chest radiographs and sputum cytology examinations for screening have been shown not to reduce lung cancer mortality. The use of biomolecular markers, autofluorescence bronchoscopy, low-dose spiral and high-resolution computed tomography, endobronchial ultrasonography, optical coherence tomography, confocal micro-endoscopy, positron emission tomography in combination with video-assisted thoracic surgery and intraluminal bronchoscopic treatments may provide new modalities with which to manage lung cancer at the earliest stage possible. New hopes arise that the combined use of more accurate and minimally invasive diagnostic and treatment techniques may justify screening and reduce mortality. More individuals may also benefit, as many in the target population already suffer from poor cardiovascular and pulmonary health due to their smoking history and are considered at risk for surgical intervention. The cost-effectiveness of lung cancer screening will strongly depend on the proper selection of the target population and the optimal application of these new techniques. Despite epidemiological controversy regarding lung cancer screening, the feasibility to define more precisely who are at risk and the use of less invasive techniques may preserve quality of life and improve the survival of many lung cancer patients.
The effect of Dust and Sand on the 5G Millimeter-Wave links (2021)

The wireless connections are a communication channel used to support different applications in our life such as microwave connections, mobile cellular networks, and intelligent transportation systems. The wireless communication channels are affected by different weather factor such as rain, snow, fog, dust, and sand. This effect is more evident in the high frequencies of the millimeter wave (mm-wave) band. Recently, the 5G opened the door to support different applications with high speed and good quality. A recent study investigates the effect of rain and snow on the 5G communication channel to reduce the challenge of using high millimeter-wave frequencies. This research investigates the impact of dust and sand on the communication channel of 5G mini links using Mie scattering model to estimate the propagating wave’s attenuation by computing the free space loss of a dusty region. Also, the cross-polarization of the propagating wave with dust and sand is taken into account at different distances of the propagating length. Two kinds of mini links, ML-6363, and ML-6352, are considered to demonstrate the effect of dust and sand in this specific operating frequency bands. The 73.5 GHz (V-band) and (21.5GHz (K-band) are the ML-6352 and ML-6363 radio frequency, respectively. Also, signal depolarization is another important radio frequency transmission parameter that is considered heroin. The numerical and simulation results show that the 5G ML-6352 is more affected by dust and sand than ML6363. The Simulink on MATLAB is used to build the communication system and simulate the effect of the dust and sand at different frequency bands.
Stability and cytotoxicity of crystallin amyloid nanofibrils (2014)

Previous work has identified crystallin proteins extracted from fish eye lenses as a cheap and readily available source for the self-assembly of amyloid nanofibrils. However, before exploring potential applications, the biophysical aspects and safety of this bionanomaterial need to be assessed so as to ensure that it can be effectively and safely used. In this study, crude crystallin amyloid fibrils are shown to be stable across a wide pH range, in a number of industrially relevant solvents, at both low and high temperatures, and in the presence of proteases. Crystallin nanofibrils were compared to well characterised insulin and whey protein fibrils using Thioflavin T assays and TEM imaging. Cell cytotoxicity assays suggest no adverse impact of both mature and fragmented crystallin fibrils on cell viability of Hec-1a endometrial cells. An IR microspectroscopy study supports long-term structural integrity of crystallin nanofibrils.