scholarly journals The first documented migration of a potter wasp, Ancistrocerus adiabatus (Hymenoptera: Vespidae: Eumeninae)

2021 ◽  
Vol 135 (2) ◽  
pp. 117-119
Author(s):  
Jeffrey H. Skevington ◽  
Matthias Buck
Keyword(s):  
Large Scale ◽  
Animal Behaviour ◽  
Migration Corridor ◽  
Flower Flies

Eumenine wasps are not known to be migratory and have never been proposed as migrants, let alone documented as such. We document a large-scale migration of a common eumenine, Ancistrocerus adiabatus, during which 44 000–68 000 wasps moved through a known migration corridor in southwestern Ontario, Canada, in less than an hour. Evidence for migration of another eumenine, Pachodynerus erynnis, six species of flower flies (Diptera, Syrphidae), and two dragonflies (Odonata) is also provided. We hope that this note encourages naturalists to focus their attention on insects at known migration concentration sites to learn more about this grossly understudied aspect of animal behaviour.

scholarly journals pamlr: a toolbox for analysing animal behaviour using pressure, acceleration, temperature, magnetic and light data in R

2021 ◽  
Author(s):  
Kiran L Dhanjal-Adams ◽  
Astrid Willener ◽  
Felix Liechti
Keyword(s):  
Error Estimation ◽  
Large Scale ◽  
Light Level ◽  
Animal Behaviour ◽  
Data Visualisation ◽  
Behavioural Patterns ◽  
Potential Applications ◽  
Technological Developments

Light-level geolocators have revolutionised the study of animal behaviour. However, lacking precision, they cannot be used to infer behaviour beyond large-scale movements. Recent technological developments have allowed the integration of barometers, magnetometers, accelerometers and thermometers into geolocator tags, offering new insights into the behaviour of species which were previously impossible to tag. Here, we introduce an R toolbox for identifying behavioural patterns from multisensor geolocator tags, with functions specifically designed for data visualisation, calibration, classification and error estimation. Some functions are also tailored for identifying specific behavioural patterns in birds (most common geolocators-tagged species), but are flexible for other applications. Finally, we highlight opportunities for applying this toolbox to other species beyond birds, the behaviours they might identify and their potential applications beyond behavioural analyses.

scholarly journals MIGRANT WORKERS AS A RESOURCE FOR THE DEMOGRAPHIC DEVELOPMENT OF RUSSIA AND THE REPUBLIC OF KAZAKHSTAN

THE BULLETIN ◽  
2021 ◽  
Vol 2 (390) ◽  
pp. 204-212
Author(s):  
S. V. Ryazantsev
Keyword(s):  
Migrant Workers ◽  
Labor Migration ◽  
Large Scale ◽  
Migration Policy ◽  
State Level ◽  
Demographic Development ◽  
Labor Migrants ◽  
Central Asian ◽  
The Republic ◽  
Migration Corridor

The article discusses the features of the demographic development of Russia and Kazakhstan in modern conditions and the medium term. The scientific problem of the study is to identify the features of the current stage and prospects of demographic development and the contribution of migration to the formation of the population and labor resources of Russia and the Republic of Kazakhstan. It was revealed that Russia and the Republic of Kazakhstan became the two largest countries for the reception of migrants in the Eurasian space. The prerequisites for large-scale and active labor migration to these states are demographic trends, growing labor requirements and the relatively successful economic development of the two countries. The key labor donors for both countries are currently Central Asian states. So, between the countries of the region on the one hand, Russia and the Republic of Kazakhstan, on the other hand, the Eurasian migration corridor has formed, which is currently one of the largest on a global scale. In both countries, it is necessary to strengthen the direction of migration policy associated with attracting labor migrants as a resource for demographic development. Despite the temporary stay in the host countries, many labor migrants pass into the category of permanent residents of Russia and the Republic of Kazakhstan. Russia, as the main host country, has not yet fully benefited from the demographic advantages of the Euro-Asian migration corridor. The country's migration policy remains quite tough and inadequate in the demographic situation. Although the approach seems to be declared at the state level that migration should be one of the development resources, many obstacles to the integration of migrants, including migrants from Central Asian countries, the main donor region, remain in the system of migration policy itself, in its mechanisms and implementation tools. The Republic of Kazakhstan, although it has not yet encountered the demographic problem in a form like Russia, can already consider labor migration as a resource for future development in pragmatic interests. It is noted that both Russia and the Republic of Kazakhstan, as countries receiving labor migrants, should emphasize in their migration policy the integration of part of labor migrants into the host society.

EURASIAN MIGRATION CORRIDOR: THEORETICAL ASPECTS, SCALE ESTIMATES, AND KEY FEATURES

2020 ◽  
pp. 5-18
Author(s):  
Sergey V. Ryazantsev ◽  
◽  
Elena E. Pismennaya ◽  
Ol’ga D. Vorob’eva ◽  
◽  
...  
Keyword(s):  
Large Scale ◽  
Asian Countries ◽  
Migration System ◽  
Theoretical Approaches ◽  
Central Asian ◽  
Central Asian Countries ◽  
Migration Flows ◽  
Migration Corridor ◽  
Money Transfers ◽  
Asian Migration

The article discusses theoretical approaches to the concept of «migration system» and migra-tion corridor, discussed in foreign and Russian scientific literature. Key theories and studies of migration systems in modern domestic and foreign science are considered. In this context, the definition and content of the concept of «migration corridor» as a form of sustainable migration links between sending and receiving countries is also being developed. The Eurasian migration corridor as a part of the Eurasian migration subsystem is theoretically justified and statistically described. It is also noted that the Slavic and Caucasian migration corridors have been formed in the post-Soviet space. It is noted that the Euro-Asian migration corridor was formed on the basis of stable migration flows between the Central Asian countries and the Russian Federation, which are characterized by large-scale flows of labor and educational migrants in favor of Russia and significant amounts of money transfers in favor of sending countries. The migration flows that make up the Euro-Asian migration corridor are dominated by temporary forms of migration, primarily labor and educational. The key migration channels of the Euro-Asian migration corridor are assessed in terms of participation of citizens of five Central Asian countries — Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan. The article highlights the peculiarities of the transformation of temporary forms of migration into permanent residence in Russia and the participation of citizens of the region in them. The positive and negative aspects of labor migration from Central Asia to Russia for sending countries in the region are highlighted.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

Evolution of Large-Scale Coronal Structures

1994 ◽  
Vol 144 ◽  
pp. 29-33
Author(s):  
P. Ambrož
Keyword(s):  
Magnetic Field ◽  
Field Line ◽  
Large Scale ◽  
Coronal Magnetic Field ◽  
Source Surface ◽  
Solar Cycles ◽  
Characteristic Relationship ◽  
The Magnetic Field ◽  
Coronal Structures

AbstractThe large-scale coronal structures observed during the sporadically visible solar eclipses were compared with the numerically extrapolated field-line structures of coronal magnetic field. A characteristic relationship between the observed structures of coronal plasma and the magnetic field line configurations was determined. The long-term evolution of large scale coronal structures inferred from photospheric magnetic observations in the course of 11- and 22-year solar cycles is described.Some known parameters, such as the source surface radius, or coronal rotation rate are discussed and actually interpreted. A relation between the large-scale photospheric magnetic field evolution and the coronal structure rearrangement is demonstrated.

Large-scale Motion of Solar Filaments

2000 ◽  
Vol 179 ◽  
pp. 205-208
Author(s):  
Pavel Ambrož ◽  
Alfred Schroll
Keyword(s):  
Magnetic Flux ◽  
Proper Motion ◽  
Time Scale ◽  
Large Scale ◽  
Accuracy Of Measurements ◽  
Solar Filaments ◽  
General Movement ◽  
Scale Motion ◽  
Velocity Scatter

AbstractPrecise measurements of heliographic position of solar filaments were used for determination of the proper motion of solar filaments on the time-scale of days. The filaments have a tendency to make a shaking or waving of the external structure and to make a general movement of whole filament body, coinciding with the transport of the magnetic flux in the photosphere. The velocity scatter of individual measured points is about one order higher than the accuracy of measurements.

Some applications of electron beam microanalysis techniques in VLSI process evaluation

1983 ◽  
Vol 41 ◽  
pp. 160-161
Author(s):  
Simon Thomas
Keyword(s):  
Integrated Circuits ◽  
Process Evaluation ◽  
Large Scale ◽  
Technology Development ◽  
Analytical Techniques ◽  
Successful Implementation ◽  
Analysis Of Failures ◽  
Characterization Of Materials ◽  
Circuits Vlsi

Trends in the technology development of very large scale integrated circuits (VLSI) have been in the direction of higher density of components with smaller dimensions. The scaling down of device dimensions has been not only laterally but also in depth. Such efforts in miniaturization bring with them new developments in materials and processing. Successful implementation of these efforts is, to a large extent, dependent on the proper understanding of the material properties, process technologies and reliability issues, through adequate analytical studies. The analytical instrumentation technology has, fortunately, kept pace with the basic requirements of devices with lateral dimensions in the micron/ submicron range and depths of the order of nonometers. Often, newer analytical techniques have emerged or the more conventional techniques have been adapted to meet the more stringent requirements. As such, a variety of analytical techniques are available today to aid an analyst in the efforts of VLSI process evaluation. Generally such analytical efforts are divided into the characterization of materials, evaluation of processing steps and the analysis of failures.

Electron microscopy study of reactively sputter-deposited Ti/N films on silicon

1992 ◽  
Vol 50 (2) ◽  
pp. 1362-1363
Author(s):  
V. C. Kannan ◽  
A. K. Singh ◽  
R. B. Irwin ◽  
S. Chittipeddi ◽  
F. D. Nkansah ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Large Scale ◽  
Hexagonal Phase ◽  
Microscopy Study ◽  
Electron Microscopy Study ◽  
Process Conditions ◽  
Tin Films ◽  
Wide Range ◽  
Fcc Phase ◽  
Circuits Vlsi

Titanium nitride (TiN) films have historically been used as diffusion barrier between silicon and aluminum, as an adhesion layer for tungsten deposition and as an interconnect material etc. Recently, the role of TiN films as contact barriers in very large scale silicon integrated circuits (VLSI) has been extensively studied. TiN films have resistivities on the order of 20μ Ω-cm which is much lower than that of titanium (nearly 66μ Ω-cm). Deposited TiN films show resistivities which vary from 20 to 100μ Ω-cm depending upon the type of deposition and process conditions. TiNx is known to have a NaCl type crystal structure for a wide range of compositions. Change in color from metallic luster to gold reflects the stabilization of the TiNx (FCC) phase over the close packed Ti(N) hexagonal phase. It was found that TiN (1:1) ideal composition with the FCC (NaCl-type) structure gives the best electrical property.

Evolution of the microstructure of Cu(Ti)/SiO2 layers annealed in NH3

1995 ◽  
Vol 53 ◽  
pp. 452-453
Author(s):  
J. Liu ◽  
N. D. Theodore ◽  
D. Adams ◽  
S. Russell ◽  
T. L. Alford ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Titanium Nitride ◽  
Large Scale ◽  
Standard Procedure ◽  
Alloy Film ◽  
Electron Beam Evaporation ◽  
Copper Metallization ◽  
Nominal Composition ◽  
Ti Alloy ◽  
Thermally Grown

Copper-based metallization has recently attracted extensive research because of its potential application in ultra-large-scale integration (ULSI) of semiconductor devices. The feasibility of copper metallization is, however, limited due to its thermal stability issues. In order to utilize copper in metallization systems diffusion barriers such as titanium nitride and other refractory materials, have been employed to enhance the thermal stability of copper. Titanium nitride layers can be formed by annealing Cu(Ti) alloy film evaporated on thermally grown SiO2 substrates in an ammonia ambient. We report here the microstructural evolution of Cu(Ti)/SiO2 layers during annealing in NH3 flowing ambient.The Cu(Ti) films used in this experiment were prepared by electron beam evaporation onto thermally grown SiO2 substrates. The nominal composition of the Cu(Ti) alloy was Cu73Ti27. Thermal treatments were conducted in NH3 flowing ambient for 30 minutes at temperatures ranging from 450°C to 650°C. Cross-section TEM specimens were prepared by the standard procedure.

Immunogold labeling of CMP-KDO synthetase produced by recombinant E. Coli cells

1987 ◽  
Vol 45 ◽  
pp. 924-925
Author(s):  
F. A. Durum ◽  
R. G. Goldman ◽  
T. J. Bolling ◽  
M. F. Miller
Keyword(s):  
Inclusion Bodies ◽  
Large Scale ◽  
Recombinant Dna ◽  
Test System ◽  
Cell Protein ◽  
Gram Negative Bacteria ◽  
Cytoplasmic Inclusions ◽  
Isolation And Purification ◽  
E Coli ◽  
Low Concentrations

CMP-KDO synthetase (CKS) is an enzyme which plays a key role in the synthesis of LPS, an outer membrane component unique to gram negative bacteria. CKS activates KDO to CMP-KDO for incorporation into LPS. The enzyme is normally present in low concentrations (0.02% of total cell protein) which makes it difficult to perform large scale isolation and purification. Recently, the gene for CKS from E. coli was cloned and various recombinant DNA constructs overproducing CKS several thousandfold (unpublished data) were derived. Interestingly, no cytoplasmic inclusions of overproduced CKS were observed by EM (Fig. 1) which is in contrast to other reports of large proteinaceous inclusion bodies in various overproducing recombinant strains. The present immunocytochemical study was undertaken to localize CKS in these cells.Immune labeling conditions were first optimized using a previously described cell-free test system. Briefly, this involves soaking small blocks of polymerized bovine serum albumin in purified CKS antigen and subjecting them to various fixation, embedding and immunochemical conditions.

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