Influence of activation conditions of dynamic activity of zeolite in drying xylene fraction

1974 ◽  
Vol 10 (10) ◽  
pp. 765-767
Author(s):  
L. F. Fominykh ◽  
K. G. Asylova
Keyword(s):  
Dynamic Activity ◽  
Activation Conditions ◽  
Xylene Fraction

SEM and Auger microanalysis studies of Cu-Be dynode surfaces at each activation condition

1978 ◽  
Vol 36 (1) ◽  
pp. 524-525
Author(s):  
T. Koshikawa ◽  
Y. Fujii ◽  
E. Sugata ◽  
F. Kanematsu
Keyword(s):  
Electron Emission ◽  
Secondary Electron ◽  
Secondary Electron Emission ◽  
Life Time ◽  
Activation Process ◽  
Beam Diameter ◽  
Activation Temperature ◽  
Electron Multiplier ◽  
Activation Condition ◽  
Activation Conditions

The Cu-Be alloys are widely used as the electron multiplier dynodes after the adequate activation process. But the structures and compositions of the elements on the activated surfaces were not studied clearly. The Cu-Be alloys are heated in the oxygen atmosphere in the usual activation techniques. The activation conditions, e.g. temperature and O2 pressure, affect strongly the secondary electron yield and life time of dynodes.In the present paper, the activated Cu-Be dynode surfaces at each condition are investigated with Scanning Auger Microanalyzer (SAM) (primary beam diameter: 3μmϕ) and SEM. The commercial Cu-Be(2%) alloys were polished with Cr2O3 powder, rinsed in the distilled water and set in the vacuum furnance.Two typical activation condition, i.e. activation temperature 730°C and 810°C in 5x10-3 Torr O2 pressure were chosen since the formation mechanism of the BeO film on the Cu-Be alloys was guessed to be very different at each temperature from the results of the secondary electron emission measurements.

A Problem of Long - Term Digital Preservation: Difference in Humanities and Natural Sciences

2014 ◽  
Vol 3 ◽  
pp. 183-195
Author(s):  
Elena Macevičiūtė
Keyword(s):  
Social Sciences ◽  
Digital Preservation ◽  
Dynamic Activity ◽  
Private Companies ◽  
Time Line ◽  
Digital Documents ◽  
Whole Process ◽  
The Difference ◽  
Technological Science

The article deals with the requirements and needs for long-term digital preservation in different areas of scholarly work. The concept of long-term digital preservation is introduced by comparing it to digitization and archiving concepts and defined with the emphasis on dynamic activity within a certain time line. The structure of digital preservation is presented with regard to the elements of the activity as understood in Activity Theory. The life-cycle of digitization processes forms the basis of the main processing of preserved data in preservation archival system.The author draws on the differences between humanities and social sciences on one hand and natural and technological science on the other. The empirical data characterizing the needs for digital preservation within different areas of scholarship are presented and show the difference in approaches to long-term digital preservation, as well as differences in selecting the items and implementing the projects of digital preservation. Institutions and organizations can also develop different understanding of preservation requirements for digital documents and other objects.The final part of the paper is devoted to some general problems pertaining to the longterm digital preservation with the emphasis of the responsibility for the whole process of safe-guarding the cultural and scholarly heritage for the re-use of the posterior generations. It is suggested that the longevity of the libraries in comparison with much shorter life-span of private companies strengthens the claim of memory institutions to playing the central role in the long-term digital preservation.

scholarly journals Evaluating Retinal and Choroidal Perfusion Changes after Isometric and Dynamic Activity Using Optical Coherence Tomography Angiography

Diagnostics ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 808
Author(s):  
Max Philipp Brinkmann ◽  
Nikolas Xavier Kibele ◽  
Michelle Prasuhn ◽  
Vinodh Kakkassery ◽  
Mario Damiano Toro ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Optical Coherence Tomography Angiography ◽  
Isometric Exercise ◽  
Dynamic Exercise ◽  
Exercise Heart Rate ◽  
Optical Coherence ◽  
Dynamic Activity ◽  
Capillary Plexus ◽  
Choroidal Perfusion

Optical coherence tomography angiography (OCTA) is a non-invasive tool for imaging and quantifying the retinal and choroidal perfusion state in vivo. This study aimed to evaluate the acute effects of isometric and dynamic exercise on retinal and choroidal sublayer perfusion using OCTA. A pilot study was conducted on young, healthy participants, each of whom performed a specific isometric exercise on the first day and a dynamic exercise the day after. At baseline and immediately after the exercise, heart rate (HR), mean arterial pressure (MAP), superficial capillary plexus perfusion (SCPP), deep capillary plexus perfusion (DCPP), choriocapillaris perfusion (CCP), Sattlers’s layer perfusion (SLP), and Haller’s layer perfusion (HLP) were recorded. A total of 34 eyes of 34 subjects with a mean age of 32.35 ± 7.87 years were included. HR as well as MAP increased significantly after both types of exercise. Both SCPP and DCPP did not show any significant alteration due to isometric or dynamic exercise. After performing dynamic exercise, CCP, SLP, as well as HLP significantly increased. Changes in MAP correlated significantly with changes in HLP after the dynamic activity. OCTA-based analysis in healthy adults following physical activity demonstrated a constant retinal perfusion, supporting the theory of autoregulatory mechanisms. Dynamic exercise, as opposed to isometric activity, significantly changed choroidal perfusion. OCTA imaging may represent a novel and sensitive tool to expand the diagnostic spectrum in the field of sports medicine.

scholarly journals Effects of Activation Conditions on the Properties of Sludge-Based Activated Coke

ACS Omega ◽  
2021 ◽  
Author(s):  
Liwei Wang ◽  
Minghua Li ◽  
Miaomiao Hao ◽  
GuangKui Liu ◽  
Shaofeng Xu ◽  
...  
Keyword(s):  
Activated Coke ◽  
Activation Conditions

Disordered Books and Dynamic Archives: Rabbinic Scholarly Practices in Early Modern Ashkenaz

AJS Review ◽  
2021 ◽  
Vol 45 (1) ◽  
pp. 48-75
Author(s):  
Tamara Morsel-Eisenberg
Keyword(s):  
Sixteenth Century ◽  
Early Modern ◽  
Dynamic Activity ◽  
Modes Of Transmission ◽  
Printed Books ◽  
Modern Learning ◽  
Shed Light

This article examines early modern learning through Ashkenazic responsa. Beyond explicit evidence from published responsa collections, implicit insights dwell in what these publications lack. These missing features shed light on sixteenth-century scholarly practices. The works’ organizational inconsistencies must be understood in context of learned archives. Such an adjustment offers a corrective to the regnant narrative, which views the introduction of print as a sharp rupture from earlier modes of transmission. This article suggests instead that the culture of printed books coexisted with older approaches, and that print was complemented by more disorderly and unconstrained forms of transmission. Comparing rabbinic “paper-ware” with contemporaneous humanist practices highlights the rabbi's working papers, focusing on a culture's dynamic activity rather than its stable output. This shift in perspective allows us to see rabbinic writings not merely as a collection of books but as a mode of scholarship.

Comparative Study of Different Activation Treatments for the Preparation of Activated Carbon: A Mini-Review

2017 ◽  
Vol 100 (3) ◽  
pp. 299-312 ◽  
Author(s):  
Muhammad Imran Din ◽  
Sania Ashraf ◽  
Azeem Intisar
Keyword(s):  
Activated Carbon ◽  
Comparative Study ◽  
Raw Materials ◽  
Chemical Activation ◽  
Comparative Approach ◽  
Adsorption Mechanisms ◽  
Temperature Activation ◽  
Activation Conditions ◽  
Physical And Chemical ◽  
Characterisation Techniques

In this review, various methods of preparation of activated carbon from agricultural and commercial waste material are reviewed. In addition, we also discuss various activation treatments using a comparative approach. The data are organised in tabulated form for ease of comparative study. A review of numerous characterisation techniques is also provided. The effect of time and temperature, activation conditions, carbonisation conditions and impregnation ratios are explained and several physical and chemical activation treatments of raw materials and their impact on the micro- and mesoporous volumes and surface area are discussed. Lastly, a review of adsorption mechanisms of activated carbon (AC) is also provided.

THREE-DIMENSIONAL TRANSURETHRAL ULTRASOUND: MEASUREMENT OF DYNAMIC ACTIVITY OF RHABDOSPHINCTER AND URETHRA IN WOMEN

2006 ◽  
Vol 5 (2) ◽  
pp. 43
Author(s):  
M. Mitterberger ◽  
G.M. Pinggera ◽  
A. Klauser ◽  
F. Frauscher ◽  
G. Bartsch ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Ultrasound Measurement ◽  
Dynamic Activity ◽  
Transurethral Ultrasound

scholarly journals Circuit-dependent striatal PKA and ERK signaling underlies rapid behavioral shift in mating reaction of male mice

2015 ◽  
Vol 112 (21) ◽  
pp. 6718-6723 ◽  
Author(s):  
Akihiro Goto ◽  
Ichiro Nakahara ◽  
Takashi Yamaguchi ◽  
Yuji Kamioka ◽  
Kenta Sumiyama ◽  
...  
Keyword(s):  
D2 Receptor ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Signaling Cascades ◽  
Male Mice ◽  
Indirect Pathway ◽  
Dynamic Activity ◽  
Reward Seeking ◽  
Electric Shocks

The selection of reward-seeking and aversive behaviors is controlled by two distinct D1 and D2 receptor-expressing striatal medium spiny neurons, namely the direct pathway MSNs (dMSNs) and the indirect pathway MSNs (iMSNs), but the dynamic modulation of signaling cascades of dMSNs and iMSNs in behaving animals remains largely elusive. We developed an in vivo methodology to monitor Förster resonance energy transfer (FRET) of the activities of PKA and ERK in either dMSNs or iMSNs by microendoscopy in freely moving mice. PKA and ERK were coordinately but oppositely regulated between dMSNs and iMSNs by rewarding cocaine administration and aversive electric shocks. Notably, the activities of PKA and ERK rapidly shifted when male mice became active or indifferent toward female mice during mating behavior. Importantly, manipulation of PKA cascades by the Designer Receptor recapitulated active and indifferent mating behaviors, indicating a causal linkage of a dynamic activity shift of PKA and ERK between dMSNs and iMSNs in action selection.

Sign in / Sign up

Export Citation Format

Share Document