About injuries with a chemical (ink) pencil

1930 ◽  
Vol 26 (8) ◽  
pp. 841-843
Author(s):  
S. I. Rizvash
Keyword(s):  
Human Tissue ◽  
Practical Interest ◽  
Russian Literature ◽  
Medical Institutions ◽  
Great Practical Interest ◽  
Treatment Of Wounds ◽  
Type Of Injury

In Russian literature, very little attention has been paid to this type of injury. I managed to find only 2 articles in which this issue is treated. In the manuals on general and private surgery, both translated and original, there is no indication of the action of aniline pencils on human tissue. Nothing is said about this even in the largest Russian monographs on the treatment of wounds (Trinkler, Petrov). Meanwhile, the injuries caused by a chemical pencil, due to their peculiar course and often even a difficult outcome, are undoubtedly of great practical interest. This prompts me to report two cases of such an injury, which I observed in different medical institutions at almost the same time.

A MODEL HIERARCHY FOR IONOSPHERIC PLASMA MODELING

2004 ◽  
Vol 14 (03) ◽  
pp. 393-415 ◽  
Author(s):  
CHRISTOPHE BESSE ◽  
PIERRE DEGOND ◽  
FABRICE DELUZET ◽  
JEAN CLAUDEL ◽  
GÉRARD GALLICE ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Plasma Density ◽  
Maxwell Equations ◽  
Ionospheric Plasma ◽  
Practical Interest ◽  
Plasma Modeling ◽  
Model Hierarchy ◽  
Great Practical Interest ◽  
Two Fluid ◽  
Insight Into

This paper deals with the modeling of the ionospheric plasma. Starting from the two-fluid Euler–Maxwell equations, we present two hierarchies of models. The MHD hierarchy deals with large plasma density situations while the dynamo hierarchy is adapted to lower density situations. Most of the models encompassed by the dynamo hierarchy are classical ones, but we shall give a unified presentation of them which brings a new insight into their interrelations. By contrast, the MHD hierarchy involves a new (at least to the authors) model, the massless-MHD model. This is a diffusion system for the density and magnetic field which could be of great practical interest. Both hierarchies terminate with the "classical" Striation model, which we shall investigate in detail.

scholarly journals Sticky Thermals: Evidence for a Dominant Balance between Buoyancy and Drag in Cloud Updrafts

2015 ◽  
Vol 72 (8) ◽  
pp. 2890-2901 ◽  
Author(s):  
David M. Romps ◽  
Alexander B. Charn
Keyword(s):  
Large Eddy Simulation ◽  
Practical Interest ◽  
Momentum Equation ◽  
Severe Weather ◽  
Convective Clouds ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Great Practical Interest ◽  
Natural Boundaries ◽  
Drag Law

Abstract The vertical velocities of convective clouds are of great practical interest because of their influence on many phenomena, including severe weather and stratospheric moistening. However, the magnitudes of forces giving rise to these vertical velocities are poorly understood, and the dominant balance is in dispute. Here, an algorithm is used to extract thousands of cloud thermals from a large-eddy simulation of deep and tropical maritime convection. Using a streamfunction to define natural boundaries for these thermals, the dominant balance in the vertical momentum equation is revealed. Cloud thermals rise with a nearly constant speed determined by their buoyancy and the standard drag law with a drag coefficient of 0.6. Contrary to suggestions that cloud thermals might be slippery, with a dominant balance between buoyancy and acceleration, cloud thermals are found here to be sticky, with a dominant balance between buoyancy and drag.

Evaluation of bond strength of cross-laminated LSL specimens under short-span bending

Holzforschung ◽  
2019 ◽  
Vol 73 (8) ◽  
pp. 789-795
Author(s):  
Meng Gong ◽  
Ling Li ◽  
Ying-Hei Chui
Keyword(s):  
Bond Strength ◽  
Test Procedure ◽  
Practical Interest ◽  
Adhesive Bond ◽  
Bond Quality ◽  
Block Shear ◽  
The Face ◽  
Great Practical Interest ◽  
Short Span ◽  
Mass Timber

AbstractMass timber panels (MTPs) have a great potential in the construction of mid- and high-rise buildings. Evaluation of the face-bond strength of MTPs is of great practical interest for this kind of products. This study aimed at developing an appropriate test procedure for evaluating the adhesive bond strength of cross-laminated laminated strand lumber (CL-LSL). Three-point short-span bending tests were conducted on two-layer asymmetric CL-LSL specimens (2LasymCL-LSL), which were adhesively bonded by two-component resins of the type polyurethane (PUR) or polyvinyl acetate (PVAc). For comparison, block shear specimens were tested as well. It was found that the 2LasymCL-LSL assembly was better suitable under the short-span bending for differentiating between good and poor bond quality of MTPs.

EXPERIMENTAL STUDY OF THE CONDITIONS OF SPRAYING LIQUIDS WITH THE AIR FLOW

2021 ◽  
pp. 32-37
Author(s):  
NATALYA G. KOZHEVNIKOVA ◽  
Keyword(s):  
Dynamic Pressure ◽  
Practical Interest ◽  
Effective Area ◽  
Measurement Point ◽  
Factors Affecting ◽  
Pests And Diseases ◽  
Advantages And Disadvantages ◽  
Dynamic Pressure Measurement ◽  
Additional Resistance ◽  
Great Practical Interest

The processes of air movement in various types of air ducts are of great practical interest in terms of designing, manufacturing, and installing spraying devices used in agricultural production to create artificial fog with fi ne sprinkling and treat crops from pests and diseases. The authors analyze the existing methods of liquid spraying and reveal their main advantages and disadvantages. Under special attention is the pneumatic method. The study found that this method is used to spray contaminated liquids and the spray quality insignificantly depends on the liquid flow rate. It was revealed that one of the main factors affecting the quality indicators of spraying devices is the dynamic pressure of the gas medium acting on the liquid during its spraying. The research has determined that the dynamic pressure value of the airflow during the liquid movement in a horizontal duct depends on three factors: the presence of additional resistance, estimated by the value of the effective area duct, the position of the point at which the pressure was measured relative to the duct axis and the distance between the measurement point and the airflow source. The experimental data were tested for reproducibility using the Cochran criterion at the 5% signifi cancelevel, which proved the process reproducibility. The research has shown that the presence of additional resistance in the duct and the position of the dynamic pressure measurement point relative to the axis of the duct have the same effect on its value. The dynamic pressure of the airflow is primarily dependent on the remoteness of the measurement point from its source.

scholarly journals Fixpoint semantics and optimization of recursive Datalog programs with aggregates

2017 ◽  
Vol 17 (5-6) ◽  
pp. 1048-1065 ◽  
Author(s):  
CARLO ZANIOLO ◽  
MOHAN YANG ◽  
ARIYAM DAS ◽  
ALEXANDER SHKAPSKY ◽  
TYSON CONDIE ◽  
...  
Keyword(s):  
Practical Interest ◽  
Optimization Techniques ◽  
Superior Performance ◽  
Horn Clauses ◽  
Set Containment ◽  
Implementation Approach ◽  
Recursive Programs ◽  
Great Practical Interest ◽  
Fixpoint Semantics ◽  
Vldb Journal

AbstractA very desirable Datalog extension investigated by many researchers in the last 30 years consists in allowing the use of the basic SQL aggregates min, max, count and sum in recursive rules. In this paper, we propose a simple comprehensive solution that extends the declarative least-fixpoint semantics of Horn Clauses, along with the optimization techniques used in the bottom-up implementation approach adopted by many Datalog systems. We start by identifying a large class of programs of great practical interest in which the use of min or max in recursive rules does not compromise the declarative fixpoint semantics of the programs using those rules. Then, we revisit the monotonic versions of count and sum aggregates proposed by Mazuran et al. (2013b, The VLDB Journal 22, 4, 471–493) and named, respectively, mcount and msum. Since mcount, and also msum on positive numbers, are monotonic in the lattice of set-containment, they preserve the fixpoint semantics of Horn Clauses. However, in many applications of practical interest, their use can lead to inefficiencies, that can be eliminated by combining them with max, whereby mcount and msum become the standard count and sum. Therefore, the semantics and optimization techniques of Datalog are extended to recursive programs with min, max, count and sum, making possible the advanced applications of superior performance and scalability demonstrated by BigDatalog (Shkapsky et al. 2016. In SIGMOD. ACM, 1135–1149) and Datalog-MC (Yang et al. 2017. The VLDB Journal 26, 2, 229–248).

scholarly journals Co-crystals and inclusion compounds of leucyl-containing dipeptides

2014 ◽  
Vol 70 (a1) ◽  
pp. C1005-C1005
Author(s):  
Melissa Ignacio ◽  
Aaron Smith ◽  
Dmitriy Soldatov
Keyword(s):  
Organic Synthesis ◽  
Interlayer Space ◽  
Food Additives ◽  
Practical Interest ◽  
Van Der Waals Interactions ◽  
Bioactive Molecules ◽  
Short Peptides ◽  
Phase 3 ◽  
Layered Architecture ◽  
Great Practical Interest

Short peptides are ecologically friendly and non-toxic molecules, so they can be safely utilized in green chemistry processes or incorporated in pharmaceuticals and food additives. It has been shown that some dipeptides can form crystals that incorporate other molecules through intermolecular hydrogen bonding and van der Waals interactions[1]. The utilization of such dipeptides for solid state organic synthesis or storage and stabilization of bioactive molecules would be of great practical interest, but the principles that define the successful combinations are not clear. In order to identify what factors lead to complementary pairs of a dipeptide and a second component, a series of leucine-containing dipeptides was screened against 40 organic solvents and solids. Direct or solvent-assisted grinding was used followed by PXRD analysis. It was found that each dipeptide was able to form new phases with some of the utilized reactive and bioactive molecules. The Figure illustrates three experimental powder patterns in the 5-35 2θ degree range. The dipeptide leucyl-valine (1) and the second component 5-acetylsalicylamide (2) combine to form a new crystalline phase (3). After screening was complete, a series of crystallizations was performed and several crystals comprised of both a dipeptide and another molecule have been isolated and studied. A number of structural motifs were observed, although a layered architecture with the second component included in the interlayer space prevailed.

scholarly journals NUMERICAL INVESTIGATION OF BREAKING IRREGULAR WAVES OVER A SUBMERGED BAR WITH CFD

2018 ◽  
pp. 43
Author(s):  
Ankit Aggarwal ◽  
Mayilvahanan Alagan Chella ◽  
Arun Kamath ◽  
Hans Bihs
Keyword(s):  
Spectral Characteristics ◽  
Wave Spectrum ◽  
Practical Interest ◽  
Irregular Waves ◽  
Regular Waves ◽  
Spectrum Change ◽  
Individual Wave ◽  
Great Practical Interest ◽  
Submerged Bar ◽  
The Individual

The study of breaking irregular waves is of great practical interest, because of the waves found in the nature. Regular waves are seldom found in the field. Irregular waves can be viewed as the superposition of a number of regular waves (wave components) with the different frequencies and the amplitudes. The breaking process for irregular waves is more complex as compared to breaking regular waves. The energy transfer between the individual wave components of different frequencies also takes place during the breaking process. Due to this, the spectral characteristics of the incident wave spectrum change during the breaking process. The main purpose of the study is to investigate the hydrodynamics during the interaction of breaking irregular waves with a submerged bar.

scholarly journals Can water evaporation rates be enhanced by employing a different polar ambient?

2020 ◽  
Author(s):  
Ashish Karn ◽  
Jonathan Ambs ◽  
Shashank Singh Deo ◽  
Ayush Vyas ◽  
Ayush Dwivedi ◽  
...  
Keyword(s):  
Surface Area ◽  
Evaporation Rate ◽  
Practical Interest ◽  
Underlying Mechanism ◽  
Water Desalination ◽  
Water Evaporation ◽  
Great Practical Interest ◽  
Conventional Methods ◽  
Increasing Temperature ◽  
Temperature Surface

Enhancing evaporation rates are of great practical interest in many technological applications such as water desalination or drying in industry. Since the conventional methods of increasing evaporation viz. increasing temperature, surface area etc. may not be always practically feasible or economical, novel methods of evaporation enhancement are necessary. The current study explores the possibility of evaporation enhancement by introducing a Tetrafluoroethane gas ambient under different conditions of heating and circulation. Depending upon the temperature and circulation conditions, as enhancement of 58 to 375% in evaporation rate has been measured and physical explanations into the underlying mechanism have been suggested.

scholarly journals Problem-oriented and communication learning communities of teachers (based on materials from Russian and foreign research)

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Valeriya Markova ◽  
Andrey Ioffe ◽  
Liudmila Bychkova
Keyword(s):  
Learning Communities ◽  
Lesson Study ◽  
Practical Interest ◽  
Experienced Teachers ◽  
Theoretical Research ◽  
Practical Significance ◽  
Teaching Staff ◽  
Communication Model ◽  
City Region ◽  
Great Practical Interest

The article presents an analysis of the concept and characteristics of learning communities of teachers, as well as the experience of organizing the activities of various associations of teachers, described in Russian and foreign literature. As a result of theoretical research, the authors identified three models for the creation and development of learning communities of teachers: problem-oriented, communication and mixed. This is the scientific novelty of the work carried out. The practical significance of the study is due to the potential to use models in the design, creation and development of learning communities at the level of a separate school, city, region, etc. It is noted that problem-oriented communities appear when there is a problem, the importance of solving which is recognized by all its participants. The main activities of such communities are Lesson Study and pedagogical supervision. Teachers meet to find a solution to a problem together, jointly develop a plan for the upcoming lesson and reflect on what has taken place. For the emergence of communication communities, the need for teachers to exchange experiences is necessary. Such associations are based on mutual learning and are organized as platforms for communication, offsite events, team competitions, mutual visits to classes, etc. Mixed communities have characteristics of both a problem-oriented and communication model. The article provides examples of Russian and foreign learning communities of teachers, which can be attributed to one of the models. In Russian practice, considerable experience has been accumulated in organizing communication learning communities at the level of cities, regions, and the whole country: all kinds of projects, festivals, competitions in which both beginners and experienced teachers can freely participate. According to the authors, in Russia they are more common than problem-oriented learning communities. Nevertheless, the latter may be of great practical interest for the teaching staff of separate schools.

scholarly journals Modeling of reactant concentration in electrocatalytic processes at conducting polymer modified electrodes

2007 ◽  
Vol 47 ◽  
Author(s):  
Valdas Jasaitis ◽  
Albertas Malinauskas ◽  
Feliksas Ivanauskas
Keyword(s):  
Polymer Film ◽  
Conducting Polymer ◽  
Practical Interest ◽  
Modified Electrodes ◽  
Charge Carriers ◽  
Solution Interface ◽  
Electrochemical Processes ◽  
Great Practical Interest ◽  
Polymer Modified Electrodes ◽  
Solute Species

This research presents a mathematical model analyzing of electrochemical processes occurring at electrodes covered with a thin film of a conducting polymer. The model takes into account the diffusion of solution species into a polymer film, diffusion of charge carriers within the film, and a chemical redox reaction within the film. The aim of this work was to find the location of a mean reaction zone that is of a great practical interest related to optimization of the parameters of electrocatalytic system for its best performance. It has been shown that electrocatalysis of solute species at conducting polymer modified electrodes proceeds within the polymer film rather than at he outer polymer/solution interface.

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