scholarly journals Recent progress on polymer scaffolds production: Methods, main results, advantages and disadvantages

2022 ◽  
Vol 16 (2) ◽  
pp. 197-219
Author(s):  
Thaís Larissa do Amaral Montanheiro ◽  
Vanessa Modelski Schatkoski ◽  
Beatriz Rossi Canuto de Menezes ◽  
Raissa Monteiro Pereira ◽  
Renata Guimarães Ribas ◽  
...  
Keyword(s):  
Recent Progress ◽  
Polymer Scaffolds ◽  
Production Methods ◽  
Advantages And Disadvantages

METHODS FOR RESTORING WOLVES OF ROLLING PRODUCTION

2020 ◽  
Vol 4 (141) ◽  
pp. 114-122
Author(s):  
DAR’YA LEBEDEVA ◽  
◽  
ANNA KARPUNICHEVA
Keyword(s):  
Thermal Effects ◽  
Machine Building ◽  
Research Purpose ◽  
Technical Literature ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Rolling Production ◽  
Machine Parts ◽  
The Stability ◽  
High Degree

Large forces and significant thermal effects are created on the rolls when rolling sheets. The higher the stability of the rolls, the less downtime during their rerolling and higher productivity. (Research purpose) The research purpose is in analyzing the ways of restoring rolls and choose the most appropriate method for restoring these parts. (Materials and methods) The article presents the analysis of the scientific and technical literature on the topic of rolling production, methods for restoring large-sized machine parts of machine-building and metallurgical industries that work in difficult conditions and are subject to a high degree of wear. Authors try to solve the problem by means of comparative and logical analysis based on theoretical and empirical methods of scientific research. (Results and discussion) The article presents two groups of methods for restoring rolled rolls: banding and surfacing the working layer of the roll. Authors have analyzed each method in terms of technology, equipment, and feasibility. The article presents the advantages and disadvantages of the methods under consideration. (Conclusions) The most acceptable way to restore parts with a high degree of wear is surfacing. It is most efficient to apply submerged surfacing using an additional hot additive. Such surfacing, despite some complication of the equipment design, allows to deposit the metal on the roll with low heat input and in most cases in one pass. Surfacing using an additional hot additive allows to increase the productivity of the process by up to 250 percent while reducing the penetration depth by 2-3 times and saving energy by up to 40 percent.

scholarly journals Peculiarities of the accounting display of transactions with the give-and-take raw materials at restaurant institutions

2021 ◽  
Vol 68 (1) ◽  
pp. 87-95
Author(s):  
A. Tsiutsiak ◽  
I. Tsiutsiak
Keyword(s):  
Raw Materials ◽  
Balance Sheet ◽  
Economic Resources ◽  
Accounting System ◽  
Activity Type ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Process Representation ◽  
Reliable Representation ◽  
Definition Of

The essence of the definition of «give-and-take raw materials» is investigated and the own vision of this category used by restaurant enterprises is formed. The scheme of conducting transactions with raw materials obtained on the give-and-take conditions at restaurants institutions is given. The peculiarities of the accounting process representation caused by the procurement of raw materials, production of semi-finished products and home-produced dishes are revealed, as well as the order of the realization accounting of such commodity stocks using production-trade and production methods is highlighted. The advantages and disadvantages of the representation in the system of bookkeeping accounts of the economic resources cycle in different ways of the production and trade activity organization of restaurant institutions are given. The emphasis is placed on the fact that in catering establishments the give-and-take raw materials, semi-finished products and home-produced dishes, produced as a result of give-and-take raw materials processings, are not the property of the catering establishment. Therefore, in order to maintain the proper accounting for transactions with the give-and-take raw materials, information about changes in the value of the investigated assets should be represented in the system of bookkeeping off-balance sheet accounts. The order of the display on the bookkeeping accounts of the transactions with the give-and-take raw materials obtained on the give-and-take conditions is highlighted. The peculiarities of calculation of dishes produced on the conditions of the give-and-take transactions are described. It is established that the formation of the value of produced semi-finished products or dishes is carried out for each order received separately, i.e. using the out-of-order cost accounting method. The peculiarities of calculation of home-produced dishes at restaurants institutions are outlined. For reliable representation of information on the availability and movement of the give-and-take raw materials, it is proposed for the enterprises of the investigated economic activity type to open the additional analytical accounts. Recommendations for improving the representation order in the accounting system, of restaurant institutions, give-and-take transactions, using offered analytical accounts, are formed.

scholarly journals The Triumph of Large-Scale Agriculture and Its Socioeconomic Impact

2018 ◽  
Vol 43 (2) ◽  
pp. 95-106
Author(s):  
András Schlett ◽  
Judit Beke
Keyword(s):  
Rural Areas ◽  
Large Scale ◽  
Socioeconomic Impact ◽  
Small Scale ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Key Drivers

Large-scale farming that utilizes industrial methods to intensify production is becoming more significant worldwide. This study explores this phenomenon and sheds light on its consequences. Contingency factors serve as key drivers when determining the advantages and disadvantages of both large-scale and small-scale farming. Significant shifts in agro-production methods have fundamentally altered ownership and production structures in agriculture and had a disastrous impact on the livelihoods of people living in rural areas.

Immunoassays for Analysis of Mycotoxins

1984 ◽  
Vol 47 (7) ◽  
pp. 562-569 ◽  
Author(s):  
FUN SUN CHU
Keyword(s):  
Ochratoxin A ◽  
Aflatoxin B1 ◽  
Recent Progress ◽  
Biological Fluids ◽  
Aflatoxin M1 ◽  
Enzyme Linked Immunosorbent Assay ◽  
Specific Antibodies ◽  
Protein Conjugates ◽  
Advantages And Disadvantages ◽  
The Past

During the past few years, several laboratories have prepared specific antibodies against aflatoxins B1, M1, B2a and Q1, ochratoxin A, T-2 toxin, and zearalenone. These antibodies were obtained from rabbits after immunizing with various mycotoxin-protein conjugates. With the availability of these antibodies, specific, simple and sensitive radioimmunoassay (RIA) and enzyme-linked immunosorbent assay (ELISA) procedures for monitoring mycotoxins and their metabolites in foods, feeds and body fluids have been developed. In this review, details are presented for the preparation of antibodies and the application of RIA and ELISA to determine aflatoxins B1 and M1, ochratoxin A and T-2 toxin in corn, peanuts, milk and other biological fluids. The sensitivity of ELISA for analysis of these mycotoxins in foods varied from 0.1 μg/L for aflatoxin M1 in milk to 5 μg/kg of aflatoxin B1 in peanuts. The advantages and disadvantages of ELISA for monitoring mycotoxins in foods and feeds are discussed. In addition, a description of recent progress on simplified clean-up procedures which may increase the sensitivity of immunoassays is presented.

DNA-Based Materials as Chemical Reactors for Synthesis of Metal Nanoparticles1, "Высокомолекулярные соединения. Серия С"

2017 ◽  
pp. 21-32
Author(s):  
Zinchenko Anatoly ◽  
G. Sergeyev Vladimir
Keyword(s):  
Hybrid Materials ◽  
Recent Progress ◽  
Chemical Reactors ◽  
Advantages And Disadvantages ◽  
Inorganic Nanomaterials ◽  
Catalytic Applications

In this mini-review we highlight a recent progress in preparation of DNA-based matrices that can be used as reactors for templating of inorganic nanomaterials and, in particular, highlight catalytic applications of such hybrid materials. We also discuss advantages and disadvantages of DNA utilization as a material and outline prospects of DNA-based technologies in future.

Silicon Carbide Power Field-Effect Transistors

MRS Bulletin ◽  
2005 ◽  
Vol 30 (4) ◽  
pp. 293-298 ◽  
Author(s):  
Jian H. Zhao
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Field Effect ◽  
Recent Progress ◽  
Field Effect Transistors ◽  
Metal Oxide Semiconductor ◽  
Oxide Semiconductor ◽  
High Power Density ◽  
Advantages And Disadvantages ◽  
Power Switches

AbstractSilicon carbide power field-effect transistors, including power vertical-junction FETs (VJFETs) and metal oxide semiconductor FETs (MOSFETs), are unipolar power switches that have been investigated for high-temperature and high-power-density applications. Recent progress and results will be reviewed for different device designs such as normally-OFF and normally-ON VJFETs, double-implanted MOSFETs, and U-shaped-channel MOSFETs. The advantages and disadvantages of SiC VJFETs and MOSFETs will be discussed. Remaining challenges will be identified.

scholarly journals Experimental methods for studying the wetting properties of oil reservoirs: a review

2019 ◽  
pp. 135-149 ◽  
Author(s):  
A. A. Ivanova ◽  
N. A. Mitiurev ◽  
S. N. Shilobreeva ◽  
A. N. Cheremisin
Keyword(s):  
Comparative Analysis ◽  
Recent Progress ◽  
Experimental Methods ◽  
Oil Reservoirs ◽  
Practical Implementation ◽  
Laboratory Methods ◽  
Wetting Properties ◽  
Advantages And Disadvantages ◽  
Unconventional Oil ◽  
Oil Formation

The theoretical principles of the laboratory methods for studying the wettability of unconventional oil formation rocks are discussed and examples of their practical implementation are presented. The comparative analysis of the advantages and disadvantages of each method is presented. It is shown that despite the recent progress in the development of methods for determining the wettability of rocks, they still need to be improved. Examples of their possible improvements are discussed.

scholarly journals Established and Future Promising Fertility Preservation Options in Adolescence and Adults

2017 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Hossein Yazdekhasti ◽  
Zahra Rajabi
Keyword(s):  
Cancer Survivors ◽  
Fertility Preservation ◽  
Recent Progress ◽  
Cancer Prognosis ◽  
Oocyte Cryopreservation ◽  
Embryo Cryopreservation ◽  
Advantages And Disadvantages ◽  
The Past ◽  
Tissue Cryopreservation ◽  
Cancer Diseases

Over the past decades, due to a high number of cancer survivors, the demands for fertility preservation have been raised dramatically, and this might come from recent progress in the cancer prognosis and diagnosis procedures. For those who are involved in cancer diseases, there are multiple options regarding their fertility preservation which can be selected based on patient’s age, the risk of gonadal involvement, the time available and the type of cancer with different advantages and disadvantages. Among all possible options, embryo cryopreservation for females and semen freezing for males are the most applicable method, however other options such as gonadal tissue cryopreservation, and oocyte cryopreservation are other promising options which would be considered if the partner was not available. As conclusion, this is noteworthy that women with cancer must benefit from adequate consultations regarding their possible fertility preservation options and immediate correct consultations definitely can help families to make their mind to choose best available options.

scholarly journals Performing on Acoustic Guitar in the Fingerstyle Technique: Historical and Methodical Aspects

2020 ◽  
Vol 8 (2) ◽  
pp. 124-139
Author(s):  
Victor A. Odoyevsky ◽  
Nataliya V. Korchagina
Keyword(s):  
Development Process ◽  
Sound Production ◽  
Musical Instrument ◽  
Theory And Practice ◽  
Historical Background ◽  
Special Technique ◽  
Production Methods ◽  
Advantages And Disadvantages ◽  
Acoustic Guitar ◽  
Sound Amplification

The article analyzes the theory and practice of acoustic guitar performing in the fingerstyle – a special technique of playing simultaneously conducting several parts (solo, rhythm and bass). This style, turning the guitar into a kind of “orchestra in miniature”, significantly expands the range of expressive possibilities of the musician-guitarist, allowing him to fully reveal the content of the performed works. Along with a discussion of the prerequisites to the emergence of an acoustic guitar as a musical instrument and show its evolution in the development process, authors provide a brief historical background on the origins and causes of fingerstyle, characteristics of sound and sound production methods, activities of its developers and popularizers, the content of the tutorial for the fingerstyle guitarist. Special attention is paid to the characteristics of the original author’s methods of performing this style. Among them: a complex reception from a pinch and a slap and a “phantom pick” for the thumb (without using the “claw”). The necessity of their application is justified, the technique of performance and the achieved results of these methods of sound extraction are described in detail. The article describes the possibilities of using electric sound amplification in the performance of fingerstyle on an acoustic guitar, analyzes the advantages and disadvantages of using various types of sound amplification equipment in a concert performance. Authors emphasize that the connection of these devices when performing fingerstyle creates a number of additional opportunities for enriching the sound, allowing to increase the artistic level of interpretation. The conclusion is made about the prospects for the development of this style. Recommendations are given for solving specific technological problems for guitarists who use fingerstyle in concert practice, both with and without sound amplification equipment.

scholarly journals Recent Progress in Diagnosis Methods for Latent Tuberculosis Infection and Its Clinical Applications

2015 ◽  
Vol 4 (3) ◽  
pp. 69-74
Author(s):  
Ling Zhou
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Recent Progress ◽  
Latent Tuberculosis Infection ◽  
Latent Tuberculosis ◽  
Interferon Γ ◽  
Clinical Applications ◽  
Active Tuberculosis ◽  
Advantages And Disadvantages ◽  
Latent Tb ◽  
Latent Tb Infection

AbstractMost people with latentMycobacterium tuberculosisinfection can partly develop active tuberculosis (TB). Therefore, diagnosis of this condition bears significance in early TB prevention. To date, the main methods for diagnosis of latent TB infection (LTBI) include tuberculin skin test and interferon γ release test. These two methods feature their own advantages and disadvantages. Although new diagnostic markers continually emerge, no uniform diagnostic criteria are available for TB detection. This study summarizes several methods for diagnosis of LTBI and new related markers and their application value in clinical practice.

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