scholarly journals Experimental Researches of the Cone-Belt Dispenser

1970 ◽  
Vol 66 (1) ◽  
Author(s):  
Zoltán HAGYMÁSSY ◽  
Erzsébet ANCZA ◽  
Ágnes GINDERT KELE
Keyword(s):  
Test Bench ◽  
Vertical Position ◽  
Different Types ◽  
Significant Change ◽  
Degree Deviation ◽  
Experimental Researches ◽  
Experimental Plots

Distributing different types of fertilizer more accurately and evenly necessary in experimental plots. In probe parcels the more and more precise labour quality demands require mechanization of experiments. A solution is offered to mechanization of distributing fertilizer on probe parcels. A new plot fertilizer distributor was designed and built. I outline here the principle of working of the plot fertilizer. The unevenness of spreading of each type is significantly influenced by the tilt of the cone-belt dispenser from vertical position. A test-bench was collected to measure the aberrations. The measurement proves that only a few degree deviation results in significant change in the unevenness of dispensing.

COMPARATIVE DESTRUCTION OF LACTIC STREPTOCOCCUS BACTERIOPHAGES ON VARIOUS SURFACES BY GERMICIDAL AEROSOLS1,2

1964 ◽  
Vol 27 (6) ◽  
pp. 161-165 ◽  
Author(s):  
E. L. Sing ◽  
P. R. Elliker ◽  
W. E. Sandine
Keyword(s):  
Stainless Steel ◽  
Test Chamber ◽  
Quaternary Ammonium Compound ◽  
Vertical Position ◽  
Ammonium Compound ◽  
Complete Inactivation ◽  
Different Types ◽  
Building Surfaces ◽  
Phage Inactivation ◽  
Dichloroisocyanuric Acid

Summary A comparison was made of destruction by various germicidal aerosols of lactic streptococcus bacteriophages on a number of different types of representative building surfaces and stainless steel. With the exception of the stainless steel the surfaces were coated either with enamel or epoxy resin. Surfaces were contaminated by fogging with a phage suspension in a test chamber. After 15 min, germicide was fogged into the chamber and phage recovered from surfaces by scrubbing with inactivator solution. Chlorine compounds as represented by dichloroisocyanuric acid (DCCA) and sodium hypochlorite (NaOCl) were markedly superior to quaternary ammonium compound (QAC) and phosphoric acid wetting agent (PAWA). Porosity of surface greatly influenced rate of phage inactivation. Aerosols appeared to be most effective on surfaces in the horizontal as compared to the vertical position. Complete inactivation of phage was not realized with either QAC or PAWA at all concentrations tested. However, fogging levels of 2000 ppm DCCA and NaOCl attained 100% of destruction of bacteriophage on horizontal building surfaces and 500 to 1000 ppm accomplished this on stainless steel.

scholarly journals The structure and activation of the phosgene molecule. Part I.—General introduction—Predissociation of molecules

1930 ◽  
Vol 128 (807) ◽  
pp. 178-189 ◽  
Keyword(s):  
Diatomic Molecules ◽  
Molecular Spectra ◽  
Wave Mechanics ◽  
General Introduction ◽  
Atomic Spectra ◽  
Different Types ◽  
Experimental Researches ◽  
Number Of Authors

The study of diatomic molecules is already very advanced. By applying the principles of wave mechanics a number of authors, especially Hund, Heitler, London, Mulliken, Herzberg, Wigner and Witmer, have developed the theory of the conditions of formation, of electronic activation, and of different types of dissociation of diatomic molecules. They have also established relations between the electronic terms of atoms and those of related molecules, and have thus succeeded in arranging the terms of molecular spectra in a manner analogous to that for atomic spectra. The experimental researches during recent years of Mulliken, Mecke, Hund, Diecke, Franck and his school, Hulthen, Birge, Hopfield, Richardson, Curtis, Johnson, Herzberg and many others have established a very exact knowledge of the structure of spectra of diatomic molecules.

scholarly journals The Establishment of Experimental Green Roofs

2018 ◽  
Vol 66 (1) ◽  
pp. 43-48
Author(s):  
Věra Hubačíková ◽  
Lenka Filipová ◽  
Petr Pelikán
Keyword(s):  
Green Roofs ◽  
Water Runoff ◽  
University Campus ◽  
Retention Efficiency ◽  
Quality Of Water ◽  
Significant Difference ◽  
Different Types ◽  
Rainwater Management ◽  
Experimental Plots

The aim of the work was establishment of research green roofs on Mendel University in Brno. The experimental green roofs were established in August 2015 and it is based on current issues of rainwater management and the quality of storm water launched into recipients or sewage system. There is a valid legislation addressing the management of rainwater in environment – decree no. 268/2009, Coll., and decree no. 269/2009, Coll. Four experimental plots were created and placed in Mendel University Campus. It was hypothesized that different types of experimental plots will result in different amount of retained water and in different quality of water runoff. Resulting hypotheses proved statistically significant difference between the height of rainfall and runoff height on individual types of green roofs. In addition, it was shown that the different types of roofs prove statistically significant difference in the ability to reduce runoff (retention efficiency).

scholarly journals Research on Influence of Different types of Orifice on Axial Steady-state Flow Force in Cartridge Proportional Valve

2019 ◽  
Author(s):  
Li Tan ◽  
Haibo Xie ◽  
Jianbin Liu ◽  
Hanben Chen ◽  
Huayong Yang
Keyword(s):  
Steady State ◽  
Test Bench ◽  
Research Model ◽  
Steady State Flow ◽  
Cfd Simulations ◽  
Proportional Valve ◽  
State Flow ◽  
Different Types ◽  
Negative Effect ◽  
Simulation Results

This article mainly investigates how orifice structure influences the characteristics of steady-state flow force. The research model of this paper is originated from a cartridge proportional valve. Firstly, predicting characteristics of the flow force working on poppet in different types of orifice through CFD simulations; secondly, several parameters of poppet and seat, which may affect the characteristics of flow force, are defined, a series of CFD calculations were conducted to find a rule how each parameter influences flow force; thirdly, according to the analysis, optimization of orifice structure parameters has been successfully realized. Finally, a test bench was established to validate the simulation results. The results show that the orifice type has a significant influence on flow force, which indicates that choosing certain type of orifice can effectively decrease the influence of flow force, and the negative effect of flow force can be reduced within an acceptable extent. Besides, the influence of orifice on pressure difference has been also taken into account. The experimental results agree well with the simulative one.

scholarly journals ENERGETIC REGULARITIES OF PULSE LOADING BY SYSTEMS WITH INTERMEDIATE LINK

2017 ◽  
Vol 2017 (1) ◽  
pp. 83-90
Author(s):  
Александр Яшин ◽  
Aleksandr Yashin ◽  
Сергей Баринов ◽  
Sergey Barinov ◽  
Алексей Киричек ◽  
...  
Keyword(s):  
Total Energy ◽  
Pulse Energy ◽  
Test Bench ◽  
Symmetry Axis ◽  
Deformation Source ◽  
Pulse Loading ◽  
Shock Pulse ◽  
Shock System ◽  
Experimental Researches ◽  
Energy Portion

The investigations carried out deal with the re-gularity study in the distribution of shock pulse energy at multiple procedures of loading. The experimental researches were carried out on the specially developed test bench in which under all waveguides (or tools) of the shock system there were situated independently (separately) sensors connected with an oscilloscope registering parameters of a shock pulse (a form, amplitude, duration). As a result it was determined that the increase of the eccentricity in the symmetry axis location of a head and a waveguide (or a tool) and their number in the shock system contributes to the reduction of an energy portion sent to the deformation source. The application of multi-contact schemes of loading allows sending large total energy of a shock pulse to the deformation source to accept conditions of experiment fulfillment. At that the energy portion of a shock pulse fall-ing to each waveguide (or a tool) in the multicontact scheme as compared with the singlecontact one decreases (for rod-formed waveguides by 20%, and for spherical tools – by 15%) at the installation of each subsequent waveguide (or a tool) in the shock system.

scholarly journals Coronavirus infection and ophthalmology

2020 ◽  
Vol 101 (3) ◽  
pp. 371-380 ◽  
Author(s):  
R F Akhmetshin ◽  
A A Rizvanov ◽  
S N Bulgar ◽  
Z G Kamalov ◽  
R F Gainutdinova ◽  
...  
Keyword(s):  
Healthcare Workers ◽  
Virus Detection ◽  
Review Article ◽  
Intermediate Hosts ◽  
Ocular Manifestations ◽  
Different Types ◽  
Infection Source ◽  
Routine Physical Examination ◽  
Coronavirus Infection ◽  
Experimental Researches

This article presents a review of the ocular manifestations of coronavirus disease 2019 (COVID-19) by using materials of Russian and international researchers. After the outbreak of COVID-19 began in China in December 2019, isolated works on ocular manifestations of coronavirus infection began to appear in the literature. The review article summarizes data on the origin and species of viruses that infect humans, the structure of coronaviruses, and intermediate hosts of the virus. A separate chapter is devoted to the mode of transmission for infectious. Itis shown that the main route of COVID-19 transmission from person to person is airborne. Of great interest to the ophthalmologists is the review of works devoted to the virus detection in the conjunctival sac. In particular, some studies have shown that in patients with COVID-19, the virus is present in the lacrimal fluid. According to the authors, it indicates that coronavirus might be transmitted through the conjunctiva. These statements are confirmed by clinical and experimental researches. The presence of coronavirus in tears indicates the possibility to cause disease by the ocular route. That is a potential infection source for different types of physicians during routine examinations of patients, and especially by ophthalmologists. Therefore healthcare workers should wear eye protection when dealing with patients who may have COVID-19. Ophthalmologists must take necessary safety precautions, even in conducting a routine physical examination. It is also worth noting that conjunctivitis can be the first symptom of COVID-19. It is proved that the virus in the conjunctiva was detected even in patients without symptoms of eye inflammation. Also interesting for researchers is the manifestations of coronavirus infection in animals, which, according to the authors, is essential for understanding the possible mechanisms of disease development and manifestations in humans.

Réaction géotropique des différents types de racines chez l'hévéa (Hevea brasiliensis)

1996 ◽  
Vol 74 (12) ◽  
pp. 1910-1918 ◽  
Author(s):  
Yannick Le Roux ◽  
Loïc Pagès
Keyword(s):  
Root System ◽  
Hevea Brasiliensis ◽  
Vertical Plane ◽  
Growth Direction ◽  
Vertical Position ◽  
Different Types ◽  
Original Direction ◽  
Growth Development ◽  
Secondary Roots ◽  
Root Observation

To describe the different types of geotropic reactions of hevea (Hevea brasiliensis), young seedlings were cultivated in root observation boxes and submitted to a double gravistimulation (90° rotation of the minirhizotrons in the vertical plane). It was demonstrated that the taproot is a strongly orthogeotropie organ since it resumed rapidly its prestimulation vertical position. Morphological and morphogenetic modifications were associated with the geotropic response: reduced speed of growth coupled with a reduction of the apical diameter as well as an alteration of ramification density in the curving zone and the following one. Early secondary roots showed a somewhat reduced orthogeotropism that was weaker as the growth direction before gravistimulation was more distant from the vertical. Secondary roots of the acropetal sequence were semiplagiotropic, that is only those roots oriented upward after the gravistimulation resumed, more or less, the original direction. Tertiary roots didn't respond to the gravistimulation and therefore were ageotropic. Complementary observations conducted in large laboratory rhizotrons showed that late forming secondary roots were plagiotropic in their younger stages, thereafter loosing most of their sensitivity to gravity. Quaternary roots were ageotropic. On the basis of these data, a geotropic gradient was defined within the hevea root system, where the strongly responding taproot and late secondary roots are opposed to the weakly or nonresponding tertiary and quaternary roots. Functional significations of these differential geotropic reactions in different hevea root types are discussed. Keywords: geotropism, gravistimulation, root system, growth, development, morphogenesis, root observation box, Hevea brasiliensis. [Journal translation]

scholarly journals Finite Element Analysis of Precast Concrete Connections under Incremental load

2019 ◽  
Author(s):  
Masoud Davari ◽  
Mahyar Ramezani ◽  
Aliakbar Hayatdavoodi ◽  
Mohammad Nazari
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Precast Concrete ◽  
Experimental Program ◽  
Concrete Frames ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Different Types ◽  
Connection System ◽  
Experimental Researches

Beam-to-column connections affect the rigidity and strength of the overall precast concrete structures. Even though many experimental researches have been carried out on beam-to-column connections, the behavior and failure mode of the connection in precast concrete is often difficult to assess through experimental program. The finite element analysis, on the other hand, can be an option to properly evaluate the condition of the connections. Nevertheless, the finite element analysis on the beam-to-column connections is quite limited. Thus, there is a need to study and explore the behavior of the connection system based on the finite element data. In this research, the finite element analysis was performed to study the performance of different types of beam-to-column connections in precast concrete frames. A total of four specimens were modeled and analyzed to study the connection behavior involving load-displacement relationship under static incremental load. Different connection details were considered and the behavior of various beam-to-column connections were investigated.

scholarly journals THE EFFECTS OF SIMULATION-BASED AND MODEL-BASED EDUCATION ON THE TRANSFER OF TEACHING WITH REGARD TO MOON PHASES

2014 ◽  
Vol 13 (3) ◽  
pp. 327-338
Author(s):  
Sedat Uçar
Keyword(s):  
Transfer Of Learning ◽  
Alternative Conceptions ◽  
The Moon ◽  
Moon Phases ◽  
Simulation Based ◽  
New Learning ◽  
Different Types ◽  
Simulation Group ◽  
Significant Change ◽  
Pre Service Teacher

Several researchers have investigated the knowledge of the causes of moon phases and how to promote the scientific understanding of these phases. However, these scholars did not determine whether this learning was transferred to the following education. The purpose of this study was to investigate the effectiveness of two different types of education on the transfer of learning with regard to astronomy content. No significant change in the understanding of the moon’s phases was observed between the groups, but a significant change in the transfer scores of the groups was observed. This result could indicate that the education increased the participants’ understanding of moon phases and that the participants in the simulation group were able to more adequately transfer their knowledge. The alternative conceptions of the causes of the moon phases were transferred to the context of the earth’s phases. In other words, alternative conceptions are transferred to new learning situations. Therefore, the alternative conceptions that the participants hold should be carefully observed when new learning is transferred. Key words: earth phases, moon phases, pre-service teacher, simulations, transfer.

Alternative Strengthening of Jewelry Tools Using Chemical-Thermal and Local Surface Treatments

2021 ◽  
Vol 1038 ◽  
pp. 68-76
Author(s):  
Oleg Volkov ◽  
Sergey Knyazev ◽  
Alexey Vasilchenko ◽  
Evgen Doronin
Keyword(s):  
Sample Preparation ◽  
Cross Section ◽  
Surface Profile ◽  
Curved Surface ◽  
Structure And Properties ◽  
Local Surface ◽  
Processing Methods ◽  
Surface Strengthening ◽  
Different Types ◽  
Experimental Researches

The study is aimed at surface strengthening of jewelry tools. Samples in the form of a tool with a flat and curved surface profile are considered. Macrophotographs of jewelry korneisen at different stages of wear, as well as after restoration and strengthening are given. The results of the influence of chemical-thermal and thermo-friction treatments on the structure and properties of U7 and U8A steels used for jewelry tools are presented. The methodology of experimental researches is given. The equipment used for each of the hardening methods investigated in this work is considered. Auxiliary media and features of sample preparation for the experiment are also described. Photos of samples and some equipment at different stages of the study are given. Data on the distribution of microhardness, photographs of microstructures in cross section of samples after different types of hardening are presented. A comparison of the strengthening efficiency of the samples after the use of different processing methods is performed.

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