491 research outputs found
Investigation of the reactivity of AlCl3 and CoCl2 toward molten alkali-metal nitrates in order to synthesize CoAl2O4
No full textCobalt aluminate CoAl2O4 powder, constituted of nano-sized crystallites, is prepared, involving the reactivity of AlCl3 and CoCl2 with molten alkali-metal nitrates. The reaction at 450 °C for 2 h leads to a mixture of spinel oxide Co3O4 and amorphous γ-Al2O3. It is transformed into the spinel oxide CoAl2O4 by heating at 1000 °C. The powders are mainly characterized by XRD, FTIR, ICP, electron microscopy and diffraction, X-EDS and diffuse reflection. Their properties are compared to those of powders obtained by solid state reactions of a mechanical mixture of chlorides or oxides submitted to the same thermal treatment
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High-resolution Near-infrared Spectroscopy of a Flare around the Ultracool Dwarf vB 10
No full textWe present high-resolution observations of a flaring event in the M8 dwarf vB 10 using the near-infrared Habitable-zone Planet Finder (HPF) spectrograph on the Hobby-Eberly Telescope. The high stability of HPF enables us to accurately subtract a vB 10 quiescent spectrum from the flare spectrum to isolate the flare contributions and study the changes in the relative energy of the Ca ii infrared triplet, several Paschen lines, the He λ10830 triplet lines, and to select iron and magnesium lines in HPF's bandpass. Our analysis reveals the presence of a red asymmetry in the He λ10830 triplet, which is similar to signatures of coronal rain in the Sun. Photometry of the flare derived from an acquisition camera before spectroscopic observations and the ability to extract spectra from up-the-ramp observations with the HPF infrared detector enable us to perform time-series analysis of part of the flare and provide coarse constraints on the energy and frequency of such flares. We compare this flare with historical observations of flares around vB 10 and other ultracool M dwarfs and attempt to place limits on flare-induced atmospheric mass loss for hypothetical planets around vB 10. © 2022. The Author(s). Published by the American Astronomical Society.Open access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Decrease of pre-load in high strength bolts in the coarse of time (provisional result)
No full textCivil Engineering and GeosciencesStructural Engineerin
The programme of a series of tests in order to compare the friction factors of Fe 37 and Fe 52
No full textCivil Engineering and GeosciencesStructural Engineerin
A novel method to allow noninvasive, longitudinal imaging of the murine immune system in vivo
No full textIn vivo imaging has revolutionized understanding of the spatiotemporal complexity that subserves the generation of successful effector and regulatory immune responses. Until now, invasive surgery has been required for microscopic access to lymph nodes (LNs), making repeated imaging of the same animal impractical and potentially affecting lymphocyte behavior. To allow longitudinal in vivo imaging, we conceived the novel approach of transplanting LNs into
the mouse ear pinna. Transplanted LNs maintain the structural and cellular organization of conventional secondary lymphoid organs. They participate in lymphocyte
recirculation and exhibit the capacity to receive and respond to local antigenic challenge. The same LN could be repeatedly imaged through time without the requirement for surgical exposure, and the dynamic behavior of the cells within the transplanted LN could be characterized. Crucially, the use of blood vessels as fiducial markers also allowed precise re-registration of the same regions for
longitudinal imaging. Thus, we provide the first demonstration of a method for repeated, noninvasive, in vivo imaging of lymphocyte behavior
Visual Basic 2012 Programmer's Reference
No full textRod Stephens is a VB programming guru and the author of more than two dozen programming books, including Stephens' Visual Basic Programming 24-Hour Trainer. He also writes frequently for such magazines as Visual Basic Developer, Visual Basic Programmer's Journal, and Dr. Dobb's Journal. Rod's VB Helper website (vb-helper.com) provides thousands of pages of tips, tricks, and code examples for VB programmer
RANCANG BANGUN SISTEM PENILAIAN PRAKTEK KERJA LAPANGAN MENGGUNAKAN MACRO VB DAN CLOUD STUDI KASUS : POLITEKNIK STMI JAKARTA
No full textAbstractVocational education or also called vocational education is education that is special (specialized) which includes all types of work. Vocational education is not limited to education that only focuses on skills guidance. But actually vocational education is also concerned with the mentality, values, and attitudes of the community (students). Students who have finished field practice will be given a score in the form of a piece of paper and the score will be given to the field practice supervisor at the STMI Polytechnic. This activity creates risks because students can commit fraud, students can be careless and so on, which makes the value can be changed, damaged and lost does not reach the supervisor at the STMI Polytechnic. From the problems above, the most appropriate thing to do is to connect directly between the field supervisor and the supervisor at the STMI Polytechnic with an assessment system. The purpose of making this system is to reduce cheating and careless acts of students who make replaced or damaged grades. In making this system the author uses VB macro tools and Cloud itself. The system development method used is SDLC. The system development method is the SDLC (System Development Life Cycle) method or often referred to as the waterfall approach. This method allows for departmentalization and control. the process of developing the model phase one by one, so as to minimize errors that might occur. Keywords: PKL Value, Macro VB,S DLC
Restoring Virtual Backbone of Wireless Sensor Network Using Position Restricted Relay Nodes
No full textAbstractIn Wireless Sensor Network (WSN), sensor nodes send sensed data through multi-hops involving intermediate relay nodes. Construction of virtual backbone (VB) of sensor network is preferred to reduce the energy depletion of the WSN. The VB brings substantial benefits by simplifying routing and topology control. In WSN, sensors are prone to failure, due to power depletion or some other reasons. Therefore, the existing VB may be partitioned into segments after failure. Hence, re-construction of VB is an important issue in sensor network. This can be achieved either by discovering alternate backbone or by redeployment additional new relay nodes to restore the VB. This paper proposes an efficient strategy for restoring VB by connecting disconnected VBs using minimum relay nodes. Finding the optimal number of relay nodes and their positions is NP-hard, heuristic algorithms are proposed to minimize the repairing cost
Variational Inference for Acoustic Unit Discovery
No full textAbstractRecently, several nonparametric Bayesian models have been proposed to automatically discover acoustic units in unlabeled data. Most of them are trained using various versions of the Gibbs Sampling (GS) method. In this work, we consider Variational Bayes (VB) as alternative inference process. Even though VB yields an approximate solution of the posterior distribution it can be easily parallelized which makes it more suitable for large database. Results show that, notwithstanding VB inference is an order of magnitude faster, it outperforms GS in terms of accuracy
Identification of the Kna/Knb polymorphism and a method for Knops genotyping
No full textDNA mutations resulting in the McCoy and Swain-Langley polymorphisms have been identified on complement receptor 1 (CR1)-a ligand for rosetting of Plasmodium falciparum-infected RBCs. The molecular identification of the Kna/Knb polymorphism was sought to develop a genotyping method for use in the study of the Knops blood group and malaria
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