scholarly journals New Cartridge Design for Assault Rifle

2020 ◽  
Vol 11 (2) ◽  
pp. 9-24
Author(s):  
Peter LISY ◽  
Martin DANIEL
Keyword(s):  
Recoil Energy ◽  
Long Distance ◽  
Ballistic Performance ◽  
Terminal Ballistics ◽  
Muzzle Energy ◽  
Fully Automatic ◽  
Cartridge Case ◽  
Close Quarter ◽  
Full Metal Jacket ◽  
Made In

The article deals with the possible design of a new cartridge for an automatic assault rifle. This hypothetical design is based on the analysis of five automatic assault rifle cartridges which are currently used in armies: 7.62×51 mm NATO, 7.62×39 mm M. 43, 5.56×45 mm NATO and also another two cartridges which are under testing both 6.8×43 mm Rem. SPC and 6.5×38 mm Grendel. The analysis of a new cartridge including internal ballistics, external ballistics, and terminal ballistics energy disposed to the target upon an impact is introduced in the article. The goal was to create a cartridge that would have better ballistic performance than 5.56×45 mm NATO and it would still possess enough accuracy of fire and speed, so that it could dispose at least minimal kinetic energy necessary to incapacitate individuals. Also it is important to maintain the constancy of this effect for the long distance shooting, somewhere around 500 m, during battles in an open area (effective range of 5.56×45 mm automatic assault rifles is normally of about 300 m what only suffices in close quarter battles). To achieve it, the bullet must have the higher sectional density than the 5.56×45 mm cartridge. The sectional density reflects the capability of bullet to penetrate through the human tissue within the requirements of wound ballistics. Based on the analysis, the value of sectional density should be approximately of 0.21 g/mm2. The function of fully automatic firing depends on the size of the recoil energy of a weapon which is also related to the muzzle energy that cannot surpass the amount of 2 500 J. The new cartridge design is based on the 6 mm Scenar bullet (FMJ - Full Metal Jacket bullet with a weight of 5.8 g) made by the Lapua Company. All the ballistic parameters must be within the intervals of strength and construction possibilities of small arms ammunition. To create a possible variation of the mentioned cartridge where its bullet will be powered by a nitrocellulose propellant (originally made in Czech Republic) and a new cartridge case will be created.

Advances in the study of the mechanochemical coupling of kinesin

2018 ◽  
Vol 32 (18) ◽  
pp. 1840001 ◽  
Author(s):  
Ming Li ◽  
Zhong-Can Ou-Yang ◽  
Yao-Gen Shu
Keyword(s):  
Molecular Dynamics ◽  
Single Molecule ◽  
Intracellular Transport ◽  
Coordination Mechanism ◽  
Personal Perspective ◽  
Long Distance ◽  
Future Studies ◽  
Mechanochemical Coupling ◽  
Dynamics Simulations ◽  
Made In

Kinesin is a two-headed linear motor for intracellular transport. It can walk a long distance in a hand-over-hand manner along the track before detaching (i.e., high processivity), and it consumes one ATP molecule for each step (i.e., tight mechanochemical coupling). The mechanisms of the coordination of its two heads and the mechanochemical coupling are the central issues of numerous researches. A few advances have been made in recent decades, thanks to the development of single-molecule technologies and molecular dynamics simulations. In this paper, we review some progress of the studies on the kinematics, energetics, coordination mechanism, mechanochemical mechanism of kinesin. We also present a personal perspective on the future studies of kinesin.

scholarly journals Installasi Base Transceiver Station (BTS) untuk Jaringan Node B pada Operator Hutchison 3 Indonesia (H3I)

2015 ◽  
Vol 11 (1) ◽  
pp. 78
Author(s):  
Uzma Septima ◽  
Lince Markis
Keyword(s):  
Receive Signal ◽  
Network Operator ◽  
Long Distance ◽  
New Process ◽  
Station Base ◽  
Communication Links ◽  
Distance Communication ◽  
Base Transceiver Station ◽  
In Transit ◽  
Made In

Base Transceiver Station is a device used to connect mobile-phone or smartphone in order to make long-distance communication, although in doing the movement or in transit from one place to another. Installation Base Transceiver Station for Network Node B At the operator Hutchison 3 Indonesia is done to make the operator Hutchison 3 Indonesia signal received by the phone for the better and not dashed when the user performs long-distance communication links with conditions in performing the movement or in the course of one place to another. Methods beginning the process of physical installation of Base Transceiver Station for Node B network in the operator Hutchison 3 Indonesia and order all the Base Transceiver Station can live well after the battery is connected to a rectifier and the required accuracy when performing the installation Base Transceiver Station. Furthermore, the integration process or Commissioning of the Base Transceiver Station for Node B network operator Hutchison 3 Indonesia on this in order to actively and After Commissioning obtained Receive Signal Level sectoral antennas of -59 dBm which can emit a signal as far as 7 km to 8 km , after the new process or Pointing connection between this new Base Transceiver Station Base Transceiver Station with preexisting and Pointing between Siak new Base Transceiver Station Base Transceiver Station Perawang with Perawang Students who have a distance of 5 km Receive Signal level of -32.4 dBm made in accordance with a budget link provided operator Hutchison 3 Indonesia is -30 dBm to -40 dBm.

Design Research of Efficient Vacuum-Type Rotary Drum Filter

2011 ◽  
Vol 480-481 ◽  
pp. 1246-1250
Author(s):  
Hong Guang Zhang ◽  
Ling Guo Wang ◽  
Yan Chun Xu
Keyword(s):  
Chemical Industry ◽  
Design Research ◽  
Long Distance ◽  
Key Issues ◽  
Rotary Drum ◽  
Made In China ◽  
Made In

The technology is developing faster and faster, and in the chemical industry, the technology is develop towards larger size, higher precision, automotive, higher pressure, and multi function. However, for the situation that the filter tray used in our county, there is a long distance between our country and the foreigner, this topic makes some research on the problems that occurred during the usage of the filter made in china, on base of which, a better filter is designed, and the new filter achieved good results. This article introduced some key issues during the design of filter.

scholarly journals Civility and diplomacy: Trust and dissimulation in transnational Afghan trading networks

2018 ◽  
Vol 18 (2-3) ◽  
pp. 175-197 ◽  
Author(s):  
Magnus Marsden
Keyword(s):  
Impression Management ◽  
Social Relationships ◽  
Long Distance ◽  
Commercial Activities ◽  
The Social ◽  
Ethical Virtue ◽  
Made In China ◽  
Trading Networks ◽  
The Relationship ◽  
Made In

This article explores the relationship between civility and diplomacy in the transnational commercial activities of traders from Afghanistan. The commodity traders on which the article focuses – most of whom are involved in the export and wholesale of commodities made in China – form long-distance networks that criss-cross multiple parts of Asia and are rooted in multiple trading nodes across the region, including the Chinese commercial city of Yiwu, Moscow and Odessa. Much scholarship associates both diplomacy and civility with impression management and dissimulation and therefore identifies such modes of behaviour as being inimical to the fashioning of enduring ties of trust. However, analysis of ethnographic material concerning the traders’ understandings of being diplomatic, as well as the ways in which they seek to conform to contested local notions of civility, furnishes unique insights into the ways in which they build the social relationships and ties of trust on which their commercial activities depend. By exploring the interrelationship between civility and diplomacy, the article seeks to move anthropological debate beyond the question of whether civility is either a form of artifice premised on performance or a deeper ethical virtue in and of itself. It suggests, rather, ambiguity, ambivalence, contradiction and imperfection are inbuilt aspects of the ways in which respect is communicated and evaluated, and ties of trust fashioned and maintained.

Celestial Orientation of Fowler's Toad b uFo Fowleri

Behaviour ◽  
1966 ◽  
Vol 26 (1-2) ◽  
pp. 105-123 ◽  
Author(s):  
Hobart F. Landreth ◽  
Denzel E. Ferguson
Keyword(s):  
Breeding Site ◽  
Internal Clock ◽  
The Sun ◽  
The Moon ◽  
Long Distance ◽  
Simultaneous Testing ◽  
Celestial Orientation ◽  
Fowler's Toad ◽  
Clock Mechanism ◽  
Made In

AbstractYoung Fowler's toads from on and near the shores of a lake were tested in a circular pen 60 feet in diameter. Under a variety of conditions (e.g. including group tests, individual tests, simultaneous testing of two groups from different shores, long distance displacement, and transit to the test pen both in view of the sky and in lightproof containers), the toads oriented under the sun to a compass direction (Y-axis) corresponding to a line bisecting the home shoreline at right angles. This orientation persisted after 72 hours in darkness, indicating the existence of an internal clock mechanism. Reorientation to a new shore was evident in 24 hours and was virtually complete after 48 hours. Orientation failed or was partially inhibited in small toads tested under dense cloud cover, at noon, and after sunset. Also, the type of orientation exhibited under the sun was evident at night under the moon, but to a lesser extent under starry skies. These mechanisms are useful in foraging and in dispersal from nursery shores. Adults are oriented at night to the breeding site even without benefit of a chorus for reference. Adults oriented to the Y-axis of the breeding site. A recorded chorus distracted migrating adults pursuing a compass course toward a pond. Non-breeding adults compensated for a displacement made in view of the sun. Celestial orientation is considered a basic orientational mechanism which most likely developed early in anuran history.

scholarly journals GROUP IDENTIFICATOIN OF CARTRIDGE CASES DISCHARGED FROM HOMEMADE SUB-MACHINE GUNS

2019 ◽  
pp. 480-489
Author(s):  
P. Hiverts
Keyword(s):  
Key Words ◽  
Group Identification ◽  
The Body ◽  
Individual Identification ◽  
Case Comparison ◽  
Cartridge Case ◽  
To Come ◽  
Cartridge Cases ◽  
Quality Tool ◽  
Made In

The increasing number of homemade sub-machine guns in caliber 9 mm Parabellum received for examination, as well as cartridge cases discharged from this weapon, made it necessary to single out the marks which can be used for group identification. The article gives the results of generalizing and systematization of marks observed during the examinations made in the laboratory. This work singles out the marks and traces which can be observed on the cartridge case surface and can be used for the identification of the type and model of the firearm. The construction features of homemade sub-machine guns were investigated. Among these features are the construction based on open bolt mechanical scheme, the use of static firing pin, methods of barrel assembling and fixing into the body of the weapon, which can lead to the appearance of a hole in the chamber, etc. The article also shows the influence of the tool processing on leaving special marks and traces on the breach face. These marks can also be used for the group identification. Based on the results of the research the article distinguishes between the main signs, which can be used for group identification, the sings similar to the ones known in factory-made weapons and the signs typical of homemade firearms. The first group consists of the marks of ejector and the extractor cutouts and the firing pin mark. For these sings the article describes special characteristics which makes it possible to distinguish them from the marks commonly observed on the factory-made examples. To the marks typical of homemade sub-machine guns can be applied breach face marks, cartridge case deformation, caused by differences between the sizes of the chamber and the cartridge, cartridge deformation while shooting when the cartridge case is not supported by the chamber, perforation of the sidewall of the cartridge case, etc. The article also discusses the issue of cartridge case comparison and individual identification. Great variety of the traces and marks as a result of low-quality tool processing was revealed. This can be the factor which makes comparison more difficult. However, the big number of individual marks observed on the cartridge cases makes it possible to come to well-grounded conclusion. Key words: cartridge cases, submachine guns, type and kind of weapon, expert practice.

Chinese Ceramic Production and Trade

2017 ◽  
Author(s):  
John Miksic
Keyword(s):  
International Markets ◽  
Human Beings ◽  
Shang Dynasty ◽  
Long Distance ◽  
The World ◽  
Production Techniques ◽  
The Indian Ocean ◽  
Made In China ◽  
Major Industry ◽  
Made In

Ceramics are the most abundant types of artifacts made by human beings in the last 12,000 years. Chinese potters discern two types of products: earthenware (tao), which is porous and does not resonate when struck, and wares with vitreous bodies (ci), which ring like a bell. Western potters and scholars differentiate stoneware, which is semi-porous, from porcelain, which is completely vitrified. The earliest ceramics in the world are thought to have been made in China around 15,000 years ago. By the Shang dynasty, potters in China began to decorate the surfaces of their pottery with ash glaze, in which wood ash mixed with feldspar in clay to impart a shiny surface to the pottery. The first ash-glazed wares were probably made south of the Yangzi in Jiangnan. In the 9th century, China began to export pottery, which quickly became sought after in maritime Asia and Africa. Pottery making for export became a major industry in China, employing hundreds of thousands of people, and stimulating the development of the first mass-production techniques in the world. Much of the ceramic industry was located along China’s south and southeast coasts, conveniently located near ports that connected China with international markets. Chinese merchants had to adapt their wares to suit different consumers. For the last 1,000 years, Chinese ceramics provided an enormous amount of archaeological information on trade and society in the lands bordering the South China Sea and the Indian Ocean, contributing a major source of data to the study of early long-distance commerce, art, technology, urbanization, and many other topics. Statistics are presented from important sites outside China where Chinese ceramics have been found.

scholarly journals Simple rules guide dragonfly migration

2006 ◽  
Vol 2 (3) ◽  
pp. 325-329 ◽  
Author(s):  
Martin Wikelski ◽  
David Moskowitz ◽  
James S Adelman ◽  
Jim Cochran ◽  
David S Wilcove ◽  
...  
Keyword(s):  
Decision Rules ◽  
Population Level ◽  
Long Distance ◽  
Migration Strategy ◽  
Anax Junius ◽  
Wind Speeds ◽  
Radio Transmitters ◽  
Migratory Patterns ◽  
And Migration ◽  
Made In

Every year billions of butterflies, dragonflies, moths and other insects migrate across continents, and considerable progress has been made in understanding population-level migratory phenomena. However, little is known about destinations and strategies of individual insects. We attached miniaturized radio transmitters ( ca 300 mg) to the thoraxes of 14 individual dragonflies (common green darners, Anax junius ) and followed them during their autumn migration for up to 12 days, using receiver-equipped Cessna airplanes and ground teams. Green darners exhibited distinct stopover and migration days. On average, they migrated every 2.9±0.3 days, and their average net advance was 58±11 km in 6.1±0.9 days (11.9±2.8 km d −1 ) in a generally southward direction (186±52°). They migrated exclusively during the daytime, when wind speeds were less than 25 km h −1 , regardless of wind direction, but only after two nights of successively lower temperatures (decrease of 2.1±0.6 °C in minimum temperature). The migratory patterns and apparent decision rules of green darners are strikingly similar to those proposed for songbirds, and may represent a general migration strategy for long-distance migration of organisms with high self-propelled flight speeds.

Gravity-assist maneuvers in implementation of Martian manned expedition with an electric rocket propulsion

2019 ◽  
Author(s):  
A.A. Sinitsin
Keyword(s):  
Flight Trajectory ◽  
Gravity Assist ◽  
Ballistic Performance ◽  
Rocket Propulsion ◽  
Two Body Problem ◽  
The Earth ◽  
Methodical Approach ◽  
Gravity Assist Maneuver ◽  
The Pontryagin Maximum Principle ◽  
Made In

The paper focuses on the analysis of energy-ballistic efficiency of gravity-assist maneuvers in the implementation of the Martian manned expedition in the period 2049–2050. The purpose of this analysis was to identify the opportunities for improving the energy-ballistic performance indicators of the Martian manned expedition through gravity-assist maneuvers around the Earth and Venus. The methodical approach to calculating the main energy-ballistic indicators of the Martian manned expedition is based on dividing the flight trajectory into sections. To determine the main characteristics of these sections, the statement corresponding to the restricted two-body problem was used. The heliocentric trajectory sections were optimized using the Pontryagin maximum principle. The families of solutions with a gravity-assist maneuver near Venus were obtained, differing in the direction of the flyby of Venus and the height of the flight orbit pericenter. The research shows the existence of extremals close in characteristics, which are with the fly-by orbit pericenter altitude restriction and without it. A comparison was made in terms of the duration of the expedition and the initial mass with solutions without a gravity-assist maneuver.

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