scholarly journals INFLUENCE OF DETONATION PRESSURE OF EXPLOSIVE COMPOSITIONS ON HEAT OF EXPLOSION

2021 ◽  
pp. 126-132
Author(s):  
И.Н. Сурначёв ◽  
Б.В. Певченко ◽  
А.В. Курбатов ◽  
Д.В. Пушкин ◽  
М.А. Чеканов ◽  
...  
Keyword(s):  
Large Volume ◽  
Practical Interest ◽  
Heat Energy ◽  
Detonation Pressure ◽  
Calorimetric Data ◽  
Heat Of Explosion

К настоящему времени накоплен большой объём калориметрических данных о теплоте (энергии) взрыва Q различных взрывчатых веществ (ВВ) и взрывчатых составов (ВС). Получены зависимости Q от начальной плотности ВВ Q(ρ0). Однако, на практике давление детонации в основном заряде можно менять, вызывая пересжатую детонацию, за счёт инициирования основного заряда мощным ВВ, поэтому практический интерес представляют зависимости теплоты взрыва от давления детонации Q(Р), которые можно получить на основе имеющихся зависимостей Q(ρ0) для индивидуальных ВВ, распространив их на ВС. Приведена методика определения зависимостей для расчёта теплоты взрыва различных ВС, включая алюминийсодержащие, как при нормальной так и при пересжатой детонации A large volume of calorimetric data on the heat energy Q of explosion for various explosives (Es) and explosive compositions (EC) has been accumulated by now. The dependences of Q on the initial ES density Q (ρ0) are obtained. However, the detonation pressure in the base charge can be changed in practice causing super compressed detonation, due to the initiation of the base charge by a powerful explosive; therefore, the dependences of the explosion heat on the detonation pressure Q (P), which can be obtained on the basis of the available dependences Q (ρ0) for individual explosives is of practical interest as they can be applied to EC. A method to determine the dependences for calculating the heat of explosion of various aircraft, including aluminum-containing ones, both during normal and super compressed detonation is presented.

Selected Abstracts of Recent Research in Stuttering

1999 ◽  
Vol 9 (1) ◽  
pp. 5-6
Author(s):  
Carrie Bain ◽  
Nan Bernstein Ratner
Keyword(s):  
Large Volume ◽  
Clinical Relevance

Due to the large volume of fluency-related publications since the last column, we have chosen to highlight those articles of highest potential clinical relevance.

Intraoperative abdominal ultrasonography-guided large volume ethanol injection for hepatocellular carcinoma

2001 ◽  
Vol 120 (5) ◽  
pp. A482-A482
Author(s):  
R MONDRAGONSANCHEZ ◽  
A GARDUOLOPEZ ◽  
H MURRIETA ◽  
M FRIASMENDIVIL ◽  
R ESPEJO ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Large Volume ◽  
Abdominal Ultrasonography ◽  
Ethanol Injection

1511: Is Transurethral Resection Safe and Efficacious for Men with Large Volume Prostates

2006 ◽  
Vol 175 (4S) ◽  
pp. 488-488
Author(s):  
Frédéric Michel ◽  
Jad Watfa ◽  
Thomas Dubruille
Keyword(s):  
Large Volume ◽  
Transurethral Resection

Respective Roles of Antithrombin III and Alpha 2 Macroglobulin in Thrombin Inactivation

1981 ◽  
Vol 45 (01) ◽  
pp. 051-054 ◽  
Author(s):  
A M Fischer ◽  
J Tapon-Bretaudiere ◽  
A Bros ◽  
F Josso
Keyword(s):  
Antithrombin Iii ◽  
Practical Interest ◽  
High Plasma ◽  
At Iii ◽  
Human Material ◽  
Cofactor Activity

SummaryIn order to investigate the mechanism of thrombin inactivation in the presence of both antithrombin III (AT III) and α 2-macroglobulin (α 2 M), thrombin and the inhibitors have been purified from human material and thrombin inactivation studied using purified reagents either alone or added to defibrinated plasma. Comparison of clotting and amidolytic activities of residual thrombin allowed to measure the amount of thrombin bound to α 2 M. In a purified reagent system as well as in plasma, part of exogenous thrombin is bound to α 2 M. The amount of bound thrombin is related to α 2 M concentration. Conversely, previous plasma α 2 M depletion by immunoabsorption increases the consumption of heparin-cofactor activity by exogenous thrombin. Thus AT III and α 2 M compete for thrombin inactivation. This finding could be of practical interest in clinical situations associating high plasma α 2 M levels and a decrease of AT III concentration.

Estimation of Competitiveness of Single-Industry Towns of the Samara Region

2020 ◽  
pp. 67-81
Author(s):  
Julia Rishatovna Kuzhanbaeva ◽  
Rustam Taufihovich Kuzhanbaev ◽  
Maria S. Guseva
Keyword(s):  
Social Services ◽  
System Analysis ◽  
Objective Assessment ◽  
Practical Interest ◽  
Federal District ◽  
Social Consequences ◽  
Statistical Parameters ◽  
Structural Dynamic ◽  
Single Industry ◽  
Integral Indicator

In order to prevent negative socio-economic trends, to predict the social consequences of decisions on the implementation of state policy in the development of single-industry territories, public authorities monitor the socio-economic situation in single-industry towns based on an assessment of a number of statistical indicators. Such a differentiated assessment of statistical parameters does not allow a comprehensive assessment of the level of development and competitiveness of a single-industry town by territory, which is of particular relevance in modern conditions of glocalization. Of particular scientific and practical interest is a comparative analysis of the level of development of single-industry towns on the basis of an integral indicator that takes into account aspects of various spheres of life of the population and allows an objective assessment of the competitive positions of single-industry territories, which is currently not used by state authorities for monitoring. The purpose of the work is to assess and justify the conditions and development trends of single-industry towns of the Samara region on the basis of calculating the integral indicator of competitiveness, taking into account the level of development of the economy, finance, employment, social security and demography, as well as the mono-profile level of territories. In this study, we used the methods of system analysis, the method of comparisons and analogies, the method of generalization, the methods of dialectic and statistical analysis, the method of expert estimates, the method of retrospective estimates and structural-dynamic analysis. The paper provides an overview of the single-industry towns of the regions of the Volga Federal District; the results of testing the methodology for assessing the competitiveness of single-industry towns of the Samara region on the basis of an integral indicator are presented and trends in its change in the period 2013–2017 are identified. The study involved four single-industry towns of the Samara region: Oktyabrsk, Pohvistnevo, Tolyatti, Chapaevsk. The calculations showed that For five years Oktyabrsk was an outsider in four of the six areas under study (economics, labor, social services, demography), which led to the lowest competitiveness index and allowed us to identify the competitiveness of a single-industry town as “below average”. In relatively equal socio-economic conditions, there were Pohvistnevo, Togliatti and Chapaevsk, the level of competitiveness of which is “above average”.

Conversion of fructose into methyl lactate over SnO2/Al2O3 catalystin flow regime

2020 ◽  
pp. 43-47
Author(s):  
S.V. Prudius ◽  
◽  
N.L. Hes ◽  
A.M. Mylin ◽  
V.V. Brei ◽  
...  
Keyword(s):  
Flow Reactor ◽  
Practical Interest ◽  
Dimethyl Acetal ◽  
Racemic Mixture ◽  
Process Conditions ◽  
Impregnation Method ◽  
Aqueous Methanol ◽  
Methyl Lactate ◽  
Al2o3 Catalyst ◽  
Target Reaction

In recent years, numerous researchers have focused on the development of catalytic methods for processing of biomass-derived sugars into alkyl lactates, which are widely used as non-toxic solvents and are the starting material for obtaining monomeric lactide. In this work, the transformation of fructose into methyl lactate on Sn-containing catalyst in the flow reactor that may be of practical interest was studied. The supported Sn-containing catalyst was ob-tained by a simple impregnation method of granular γ-Al2O3. The catalytic ex-periments were performed in a flow reactor at temperatures of 160-190 °C and pressure of 3.0 MPa. The 1.6-9.5 wt.% fructose solutions in 80% aqueous methanol were used as a reaction mixture. It was found that addition to a reac-tion mixture of 0.03 wt.% potassium carbonate leads to the increase in selec-tivity towards methyl lactate on 15% at 100% conversion of fructose. Prod-ucts of the target reaction С6Н12О6 + 2СН3ОН = 2С4Н8О3 + 2Н2О were ana-lyzed using 13C NMR method. The following process conditions for obtaining of 65 mol% methyl lactate yield at 100% fructose conversion were found: use of 4.8 wt.% fructose solution in 80% methanol, 180 °С, 3.0 МПа and a load on catalyst 1.5 mmol C6H12O6/mlcat/h at contact time of 11 minutes. The cata-lyst productivity is 2.0 mmol C4H8O3/mlcat/h and the by-productі are 1,3-dihydroxyacetone dimethyl acetal (20%) and 5-hydroxymethylfurfural (10%). It should be noted that a racemic mixture of L- and D-methyl lactates has been obtained by conversion of D-fructose on the SnO2/Al2O3 catalyst. The SnO2/Al2O3 catalyst was found to be stable for 6 h while maintaining full fruc-tose conversion at 55–70% methyl lactate selectivity. After regeneration the catalyst completely restores the initial activity.

Characteristics of Large Volume Discharges in Water using Pulsed Power

2003 ◽  
Vol 123 (7) ◽  
pp. 618-622 ◽  
Author(s):  
Hiroshi Nakashi ◽  
Tatsuya Hirooka ◽  
Sunao Katsuki ◽  
Hidenori Akiyama
Keyword(s):  
Large Volume ◽  
Pulsed Power
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