bluuebunny/crossref_metadata_2025 huggingface dataset:
TIC y conductas de riesgo en Primaria: prevención y promoción de la salud en la escuela
Authors: Reina Giménez Amalia , Luque Salas Bárbara , García García Victoriana , De Larriva Casares Mª Victoria , Blanco Ruiz Mª Soledad , Cuadrado Esther , García Torres Francisco
Published: January 2018

El objetivo de este proyecto de innovación educativa ha sido poner en marcha un plan de formación para dotar a los futuros maestros y maestras en Educación Primaria de las competencias necesarias para desarrollar su papel como agentes de prevención en la escuela, concretamente en las conductas de riesgo relacionadas con el uso de las TIC en la edad escolar. Para ello se han realizado un conjunto de actuaciones desde una perspectiva psicoeducativa que han promovido la reflexión en torno a los factores de riesgo y los hábitos saludables en el uso de las TIC durante la etapa de primaria (6-12 años).
Three crucial biological characteristics that’s required for sustaining the livelihood of prokaryote and eukaryote cells
Authors: Singh Rishan
Published: January 2018

Since living organisms will always form an important part of the ecosystem, it’s imperative to achieve a view on how imbalances cause problems. The one way in attaining this view is by understanding the way in which cells behave in different environments, ranging from the native environment to tested conditions. Cell viability, respiratory events as well as metabolic and nuclear shutdown are some critical events that occur, generally, in prokaryote and eukaryote cells. The distinct characteristics between the two cell types enable an advanced understanding about the occurrence of those features and processes attained during medicinal, and other cell-based studies.
Bioprocess engineering and genetically modified foods: tackling food insecurity in Africa
Authors: Matthew Makinde Oluwadamilola , Ikhimiukor Osebhahiemen Odion , Fapohunda Stephen
Published: January 2018

Bioprocess engineering today has made tremendous discoveries principally aimed at improving the overall quality of living of any society. Significant of these discoveries is the cultivation of genetically modified foods (GM foods). This paper discusses the problem of food security in sub-Saharan Africa (SSA) and the practicability of GM foods in ameliorating this problem. In SSA, food security is currently being threatened by several factors ranging from natural systems that cause environmental deterioration such as floods and droughts to anthropogenic exacerbations ranging from poor land and agricultural management policies; increase in social and economic inequality; terrorism, civic unrest, strife and wars and rapid population growth and demographic changes, amongst others. Drawbacks to the poor food security in SSA is majorly associated with malnutrition and corresponding loss in human capita productivity in the region. Statistics currently portray that one in four persons in Africa is undernourished. Hence, the timely need for disruption in current trends is imperative. The growth of GM foods has seen an exponential increase worldwide, with over 179.7 million hectares being planted, this trend is however very poor in SSA. The pros, cons and hindrances influencing the use of GM foods in SSA have been discussed. It is the opinion of the authors that the use of Biotech improved foods in curbing the food crisis in SSA should be explored and committed to by the African Union, alongside amendment of policies that promulgate weaknesses of agricultural institutional in African Nations.
Indirect somatic embryogenesis from transgenic immature leaf of safflower Carthamus tinctorius (Mohler, Roth, Schmidt & Boudreaux, 1967) (Asterales: Asteraceae)
Authors: Pradeep Kumar S. , Ranjitha Kumari B. D.
Published: January 2018

Highly efficient protocol is developed for indirect somatic embryogenesis from transgenic immature leaf of safflower Carthamus tinctorius (Mohler, Roth, Schmidt & Boudreaux, 1967) (Asterales: Asteraceae) explants in solid culture. Here two different half strength mediums like MSG and EMM both were tested in addition to inorganic and organic nitrogen sources and also combination of the reference medium. Inorganic nitrogen source shows about 39.5 number of embryos with 37% embryo germination and organic Nitrogen source like L-glutamine (20 uM) on reference medium influenced 80.5 number of somatic embryos with 44.9% germination. However, maximum of 92.0 number of embryo induction with 52.5% germination was noticed on CH (casein hydrolysate) (1.5 mg/L) containing medium. Combination of inorganic and organic nitrogen sources like NH4NO3 (40 uM) in combinations with reduced form of organic nitrogen casein hydrolysate (CH) (1.5 mg/L) was found to be most suitable for induction of somatic embryos with a maximum of 117 number of somatic embryos with 60.9% germination in immature leaf explants. About 57% plant conversion rate showed in NARI-6 cultivar after 2 weeks of culture. However it showed maximum plant conversion rate about 68% with basal medium along with 1.5% sucrose supplemented with GA3 (1.5 uM) and spermidine (1.0 uM). Germinated embryos with shoot and root poles were isolated and subcultured on suitable root induction medium containing NAA (2.5 uM) + AgNO3 (1.5 uM) showed maximum rooting frequency of about 69.6%.
Variability in production of extracellular enzymes by different fungi isolated from rotten pear, peach and grape fruits
Authors: Parveen Shazia , Wani Abdul Hamid , Bhat Mohd Yaqub , Koka Jahangir Abdullah , Fazili Mohammad Afaan
Published: January 2018

Fifteen fungal pathogens, viz. Penicillium chrysogenum, Penicillium expansum, Monilinia fructigena, Trichothecium roseum, Cladosporium herbarum, Aspergillus niger, Coprinus psychromorbidus, Alternaria alternaria, Phytophthora palmivora, Pythium sp., Fusarium solani, Alternaria sp., Monilinia sp., Guignardia bidwellii and Rhizopus stolonifer isolated from rotted fruits were evaluted for the production of different enzyme on solid culture media. All the isolates produced enzymes on the media used, 87.67% of the isolated fungi were found to produce amylases, 80.00% of the fungi produced lipases, 73.33% produced proteases, cellulases by 66.67% and pectinases by 60.00%. The array of enzymes produced differs between different fungi. Penicillium sp., Alternaria alternata, Rhizopus stolonifer and Alternaria sp. were found to produce all the tested enzymes on culture media. These pathogens are known to attack almost all the plants, fruits, vegetables and cause many diseases. The differences in the enzymatic production of different fungal pathogens represent their virulence and specificity in causing different fruit rot diseases.
Analysis of biochemical and nutritional constituents of different size groups of Macrobrachium malcolmsonii (Milne-Edwards, 1844) (Decapoda: Palaemonidae) for the identification of its nutritional requirements
Authors: Ramasamy Thirumurugan , Sridhar Arun , Sekar Rajkumar Krishnasamy , Murugesan Sathya Deepika
Published: January 2018

Prawns have been contributing almost 15% by value in global aquaculture production. In this study, different size groups (4-19 cm) of fresh water prawn, Macrobrachium malcolmsonii (Milne-Edwards, 1844) (Decapoda: Palaemonidae) were collected from the Cauvery River, Tamil Nadu, India, and estimated to identify the protein (P), lipid (L) and carbohydrate (CHO) level. The adult prawns exhibited highest values 61.63% P, 6.95% L and 5.40% CHO. The gas chromatography of small size groups of prawns showed increased amount in various fatty acids such as palmitic acid, stearic acid etc. The tissues result determined by high performance liquid chromatography showed that the amino acids such as Aspartic acid, Lysine etc., are high in adult groups. The protein profile of the muscle samples displayed various polypeptides ranging from 200 to 20 kDa. Results of this study clearly implied the biochemical and nutritional constituents of freshwater prawn, M. malcolmsonii. It would be useful to design the required composition of feed in order to get higher yield at lower cost production.
Glycogen and protein profiles of Clinostomum tilapiae Ukoli, 1966 (Digenea: Clinostomidae) and putative species Clinostomum Morphotype1 in a tropical river (Anambra River Basin, Otuocha, Nigeria)
Authors: Echi Paul Chinedu
Published: January 2018

There has been little attention to the glycogen and protein profiles of Clinostomum tilapiae Ukoli, 1966 (Digenea: Clinostomidae) and recently studied Clinostomum Morphotype1 as well as the epidemiological status of the later. The protein content of the cyst membrane 10.10 +/- 0.90 g/dL and host muscle tissue 11.9 +/- 0.80 g/dL are higher than the protein content of Clinostomum Morphotype1 tissue 7.9 +/- 0.40 g/dL. Conversely, the host muscle tissue glycogen content 8.25 +/- 1.07 mg/kg is slightly lower than both the cyst tissue 9.20 +/- 0.54 mg/kg and Morphotype1 9.06 +/- 0.79 mg/kg, respectively. However, the glycogen content of Clinostomum tilapiae 13.10 +/- 0.92 mg/kg is higher than both host muscle tissue glycogen content 8.25 +/- 1.07 mg/kg and the cyst tissue 9.20 +/- 0.54 mg/kg. Clinostomum tilapiae exhibited the invasive characteristic of trematodes. Season influenced the occurrence of Morphotype1 with higher prevalence in dry (54.01%) than rainy season months (45.98%).
Comparative study of physical, chemical, microbiological and sensory aspects of some sun dried fishes in Bangladesh
Authors: Majumdar Bhaskar Chandra , Afrin Faria , Rasul Md. Golam , Khan Murshida , Shah A. K. M. Azad
Published: January 2018

An investigation was carried out to compare the physical, chemical, microbiological and sensory properties of three freshwater dried fish products of Wallago attu Bloch & Schneider, 1801 (Siluriformes: Siluridae), Channa striatus (Bloch, 1793) (Perciformes: Channidae) and Glossogobius giuris (F. Hamilton, 1822) (Perciformes: Gobiidae). The traditionally sun dried fishes were collected from Kawran Bazar Fish Market, Dhaka, Bangladesh. Results showed that the water reconstitution properties varied among the dried fishes where maximum rehydration was observed in the C. striatus at room temperature, 40 oC and 60 oC. Moisture content of W. attu, C. striatus and G. giuris were 22.70% +/- 0.45%, 18.75% +/- 0.58% and 21.93% +/- 0.54%, respectively; the protein content were 61.85% +/- 0.99%, 66.44% +/- 1.02% and 62.83% +/- 0.87%, respectively; the lipid content were 6.21% +/- 0.93%, 6.81% +/- 0.72% and 5.98% +/- 0.55%, respectively, and the ash content were 6.79% +/- 1.11%, 6.49% +/- 1.29% and 7.83% +/- 0.98%, respectively. Peroxide value, acid value, pH, TVB N value and aerobic plate count were found to be highest in W. attu followed by G. giuris and C. striatus. Results of this study revealed that traditionally sun dried fish products were acceptable quality in terms of physico-chemical, microbiological and sensory aspects.
HIV and viral hepatitis co-infection in pregnancy: an epidemiological, clinical and diagnostic review
Authors: Silva Sávio Freire da , Verde Roseane Mara Cardoso Lima , Vieira José Felipe Pinheiro do Nascimento , Soares Leonardo Ferreira , Nascimento Matheus Hipólito do , Oliveira Evaldo Hipólito de
Published: January 2018

Even though the survival of the population infected with HIV has been increased due to the intensification of antiretroviral therapy, co-infection with hepatitis B or hepatitis C has attracted the attention of doctors and other health professionals regarding the increased incidence of chronic complications resulting from viral hepatitis in HIV-infected population, which differs from that with other opportunistic diseases. Women coinfected with these viruses have an increased risk of complications during pregnancy, and the vertical transmission of these infections cause significant morbidity and mortality among children. This study aimed to investigate the risks of co-infection with HIV, hepatitis B, and hepatitis C during pregnancy, through a literature review of the last ten years, using the databases LILACS, MEDLINE and SCIELO, which make up the Virtual Health Library. A total of 106 articles were found, by searching in these databases, 46 of which were pre-selected to be read in full, resulting in 15 approved articles. It was noted that most of the accepted studies were carried out in countries of sub-Saharan Africa and Europe, followed by Brazil and the United States. The presence of co-infections made the infection worse and led to disease progression, both in the mother and in the child, compared to infection with only one of these viruses. Therefore, early diagnosis and prevention and treatment are essential to reduce and prevent the vertical transmission of these viruses.
An Empirical Analysis of Repulsive Buying Behaviour
Authors: Kumar Satinder
Published: January 2018

This study endeavours to access repulsive buying behaviour and various variables impacting revolting response of consumer towards aptly marketed product. 292 respondents were analysed from Amritsar and Ludhiana in North India and results were drawn using structural equation modelling, which manifests latent variables i.e. psychological factor, usage of product, lifestyle and opinion and product. Better understanding of repulsive buying behaviour has positive contribution to country’s economic state and also towards quality of product and services. In the recent year’s consumers are showing revulsion in buying pattern. Repulsive buying behaviour in consumers is repugnance for product i.e. a strong feeling of distaste for products. The product is repelled by consumer if it doesn’t match the social status of consumer; celebrity endorsing the product is not followed or admired by consumer. Besides, various unresolved issues and complaints of customers also deteriorate the image of marketer. When the product is overloaded with wasteful features or is against the culture and religion of consumer or not according to planning of consumer then it is not entertained by consumer. In situations when customer has faced dissatisfaction, by usage of product or has no knowledge about the usage then also the consumer turns off from the product.
JOB EMBEDDEDNESS: FROM THEORY TO PRACTICE
Authors: Agrawal Harshita , Singh Anushree
Published: January 2018

Job embeddedness (JE) is an emerging concept in the field of employee turnover research and suggests some novel and stimulating ways to think about employee retention globally. Although research implications of JE are encouraging, there is a paucity of research on the topic domestically, which limits the practical efficacy of the same. Indian organizations, therefore, being bitten by high attrition rate, need a better understanding of the concept of JE. The present paper, based on the literature review, thus discusses the following aspects related to job embeddedness specifically: the concept of job embeddedness, dimensions and measurement of job embeddedness, the predictive validity of job embeddedness and promising expansions of the same across nations and organizations. At the end, we embed our suggestions as to how organizations can implement a sound retention management program incorporating job embeddedness.
HIV related knowledge and attitude among nurses and paramedical health care providers in Delhi
Authors: Kumar Sukhender , Jain Pankaj , Jangid Narendra
Published: January 2018

Currently, estimated 2.1 million people in India are living with Human Immunodeficiency Virus (HIV) infection. This study will discuss about the knowledge and attitude regarding HIV transmission among paramedical staff as they are coming directly in the contact with patients in out-patient department (OPD), in-patient department (IPD) and operative cases. The study was conducted with 94 paramedical staff of 36 small and medium level private health care facilities in Delhi. The study finds that knowledge about the infection of HIV is quite poor among nurses and paramedics staff in healthcare settings. The attitude of the staff was also not found on positive side. This study recommends that a rigors information, education, and communication program should be implemented in the healthcare settings
Balancing Corporate Governance with Corporate Social Responsibility
Authors: Agarwal Pinky , Srivastava Sankalp
Published: January 2018

Corporate Governance can be defined as a set of rules and regulations which are required for effective governance of any corporate organization. The effective and transparent corporate governance is becoming increasingly important now. As per the provisions of Companies Act, 2013, corporate are required to spend a stipulated amount of their profits on social activities as Corporate Social Responsibility (CSR).

In order to adapt to the prevailing business practices, a path driven by the ethical norms and sound accountability needs to be taken in the form of good Corporate Governance and CSR. It can be said that today, both Corporate Governance and CSR focus on ethical practices in business and the responsiveness of an organization to its stakeholders and the environment in which it operates.

This paper is an attempt to strike a balance between good corporate governance and CSR thereby having a tradeoff between social welfare and profit maximization. Further, the research does not take into account the CSR practices of private organizations and is limited to the public organizations only. This adds to the gap in research and hence a suitable scope for further research.
Green Practices, Standards and Conformity Issues in the Indian Food Processing Industry
Authors: Azhar S. B. , Khan F. M. , Gupta A. S.
Published: January 2018

The food processing industry of India is significantly affected by the substandard quality issues. Insufficient focus on safety and quality standards has affected export of processed food products and also resulted in low competitive advantage in the global market. Even in the domestic market due to increased awareness, people demand secure, non-toxic and pesticide-free products. The paper reviews literature related to food standards and aims to comprehend food safety regulations existing in India along with the present state of preparedness of the food industry to comply with the international standards. The policy measures to be undertaken to this effect are also examined. Promotional activities like credible labelling and certifications are essential to popularize the safety attribute of processed food products and up-gradation of Agmark standards to Codex Alimentarius requirements by the Indian government are necessary to ensure high quality of food products. One of the main precautionary methods for food safety concern is effective implantation of traceability. In order to improve food traceability system and increase the business performance of food industry, management should focus on regulatory framework, food safety, food quality, and certification. The suggestions presented if implemented efficiently would assist in growth of the Indian agro industry, both at the domestic and global level.
An Empirical Examination of Perceived Risk in Mobile-Banking
Authors: Srivastava Karnika , Kumar Manoj
Published: January 2018

Financial institution that offered mobile applications to the consumers should give attention to the perceived risk factors of Mobile Banking adoption in order to retain existing customers as well as attract new consumers. The study suggests that banks should build an application with features to facilitate users’ assessment of Mobile Banking services and thus minimize the perceived risk and maximize the perceived ease of Mobile Banking services. The impact of risk and trust on Mobile Banking adoption has also been examined and shown to be significant to Mobile Banking adoption in the context in India. This study is based on the Descriptive research, where valid responses are collected from the respondent by filling questionnaire. Keeping the TAM proposed by Davis as a theoretical basis, an extended TAM incorporating security and privacy related issues for Mobile Banking adoption is conceptualized. The paper reveals that perceived risk has a negative impact on behavioural intention of Mobile Banking adoption and trust has a negative impact on perceived risk. A well-designed mobile application was also found to be helpful in facilitating easier use and minimizing perceived risk concerns regarding Mobile Banking usage. The purpose of this paper is to examine the effect of perceived risk on Mobile Banking user adoption.
Improving Health Care Services In India: Public-Private Partnership is the Way Out
Authors: Jana Debabrata , Sinha Abhijit
Published: January 2018

A Public-Private Partnership (PPP) is a government service or private business venture which is funded and operated through a partnership of government and one or more private sector companies. Public-Private Partnerships and Collaboration (PPPs and PPC) in the Health Sector is important and timely in light of the challenges the public sector is facing in healthcare finance, management, and provision. PPPs and PPC in the health sector can take a variety of forms with differing degrees of public and private sector responsibility and risk but are characterized by various similarities as well. In our country, with regard to health care, the main responsibility is that of the state which aims to provide free access to health care system to all sections of the society. But a look at the health infrastructure of our country shows that in rural areas, in particular, there is insufficient infrastructure, be it hospitals, primary health care systems, ambulances etc. Hence, the urgent need of the government is to immediately take measures that will help to develop a basis to provide the needed medical support to all. Although the private sector is inequitable and expensive with over-application of clinical/operational procedures, it is perceived to be easily accessible, better managed and more efficient than its public counterpart. It is expected that PPP model in the sector will prove the success story of Indian health care system.
Regional comprehensive drought disaster risk dynamic evaluation based on projection pursuit clustering
Authors: Zhu Yongnan , Li Lei , Zhao Yong , Liang Zhongmin , Li Haihong , Wang Lizhen , Wang Qingming
Published: January 2018

We used system theory to analyze the structure of a regional drought disaster system and separated the drought disaster risk system into three subsystems. These were drought disaster-causing factors, disaster-inducing environments, and disaster-bearing bodies. Analysis of the main factors of these subsystems allowed the establishment of a regional comprehensive drought disaster risk evaluation index system. To simultaneously evaluate the distribution and development trends of the regional comprehensive drought disaster risk, we established a dynamic evaluation model. Based on the ideas of the projection pursuit clustering method and the dynamic comprehensive evaluation method, the model can make use of multi-dimensional space–time drought disaster information. The model was applied to evaluate comprehensive drought disaster risk in the Xuzhou region, China. The evaluation results show that the method was able to illustrate the development trend and distribution of the comprehensive drought disaster risk in the Xuzhou region. The clustering zoning results show that Pizhou City is the area with the highest risk in Xuzhou, while Fengxian has the lowest. The development trend of comprehensive drought disaster risk with time is not significant.
Novel p–n junction UiO-66/BiOI photocatalysts with efficient visible-light-induced photocatalytic activity
Authors: Li Yuejin , Shang Xili , Li Changhai , Huang Xiaoming , Zheng Jingjing
Published: January 2018

Novel visible-light-induced UiO-66/BiOI photocatalysts with a p–n junction structure have been prepared for the first time through a facile hydrothermal method. The prepared photocatalysts were characterized using the powder X-ray diffraction, high resolution transmission electron microscopy, scanning electron microscopy, UV–visible diffuse reflectance spectra, and N2 adsorption–desorption (Brunauer–Emmett–Teller) techniques respectively. The photodegradation performances of UiO-66/BiOI photocatalysts were evaluated by photodegrading salicylic acid under visible-light irradiation. The UiO-66/BiOI composites displayed much higher photocatalytic efficiencies than pure BiOI under visible light. When the content of UiO-66 was 5.2 wt%, the composite (UiO-66/BiOI-2) has the best photocatalytic activity. Most of the salicylic acid molecules can be degraded in 100 min. The degradation rate of UiO-66/BiOI-2 samples is higher than single BiOI and UiO-66. The enhanced photocatalytic performance of UiO-66/BiOI may be ascribed to the formation of p–n heterojunctions between BiOI and UiO-66, which facilitates the transfer and separation of the photogenerated charge carriers. After recycling of the photocatalyst for five times for the photodegradation of salicylic acid, more than 85% of salicylic acid could still be degraded in the fifth cycle, implying that the as-prepared photocatalysts are highly stable.
Process optimization of CNP removal from industrial soft drink wastewater in a single up flow A2O with continuous feed and intermittent discharge regime
Authors: Nouri Amir , Zinatizadeh Ali Akbar
Published: January 2018

Simultaneous removal of carbon and nutrients (CNP) in a single laboratory-scale bioreactor is advantageous in terms of reactor volume and energy consumption. In this study, an innovative up-flow anaerobic/anoxic/aerobic (A2O) single bioreactor with continuous feed and intermittent discharge (CFID) regime equipped with a movable aerator in the reactor height for simultaneous removal of CNP from soft drinks wastewater was successfully designed, fabricated and operated. The effects of four independent variables, i.e. hydraulic retention time (HRT), aerator height, biomass concentration and nitrogen/soluble chemical oxygen demand (N/sCOD) ratio at three levels in the range of 4–8 h, 37–55.5 cm, 4,000–6,000−1, and 0.05–0.2, respectively, on eight process responses were investigated. The central composite design (CCD) and response surface methodology (RSM) were applied to design the experimental conditions, model the obtained data, and optimize the process. The bioreactor provides three conditions with different dissolved oxygen (DO) (anaerobic, anoxic and aerobic) in a single bioreactor by placing the aerator in the middle of the reactor. As a result, the maximum sCOD, total nitrogen (TN) and total phosphorus (TP) removal were about 100, 92 and 41%, respectively. The optimum region obtained was an HRT of 5–11 h, a mixed liquor suspended solids (MLSS) concentration of 4,000–4,700 mgL−1, and an aerator height of 46.25 cm, at the N/sCOD ratio of 0.1.
Broadband liner impedance eduction for multimodal acoustic propagation in the presence of a mean flow
Authors: Troian R. , Dragna D. , Bailly C. , Galland M.-A.
Published: January 2018

Modeling of acoustic propagation in a duct with absorbing treatment is considered. The surface impedance of the treatment is sought in the form of a rational fraction. The numerical model is based on a resolution of the linearized Euler equations by finite difference time domain for the calculation of the acoustic propagation under a grazing flow. Sensitivity analysis of the considered numerical model is performed. The uncertainty of the physical parameters is taken into account to determine the most influential input parameters. The robustness of the solution vis-a-vis changes of the flow characteristics and the propagation medium is studied.
Uniqueness theorem for Inverse Sturm–Liouville Problem with Nonseparated Boundary Conditions
Authors: Akhtyamov A.M. , Mamedov Kh.R.
Published: January 2018

Consider the string, which vibrates in a medium with the variable elasticity coefficient q(x). Interesting to follow the inverse problem: is it possible to determine the variable elasticity coefficient q(x) by the natural frequencies of string vibrations. In 1946, G. Borg has been shown that a spectrum of frequencies is not sufficient to uniquely identify the medium elasticity coefficient q(x). He offered the use of two frequency spectrum to uniquely identify of the medium elasticity coefficient q(x). The second frequency spectrum is obtained by fastening the string to change at one of its ends to the other fastening. It was shown that these two frequency spectra already sufficient to uniquely identify q(x) and the boundary conditions of both problems.

The case where the string fastening at one end depends on the other end fastening, is more difficult to solve. The boundary conditions, appropriate for the occasion, called nonseparated. Two spectra (of two boundary value problems) to restore both q(x), and the nonseparated boundary conditions are not enough. In modern studies the spectra of the two eigenvalues boundary problems and an infinite sequence of signs is generally used for an uniqueness recovery. While this approach is useful in theoretical mathematics, it is inconvenient for the mechanics, because not clear the physical meaning of the corresponding sequence of signs.

In this article, instead of the two spectra and the sequence of signs as the spectral data are offered to use 7 of the eigenvalues of the initial boundary value problem, the spectrum, and the so-called norming constants of other boundary value problem. The physical sense of these data is quite clear. The first 7 eigenvalues of an initial boundary problem mean the first 7 natural frequencies of string vibrations. Norming constants represent norms from eigenfunctions. The spectrum and norming constants express a so-called spectral function. The spectral function gives a frequency spectrum with columns of vibrations amplitudes characteristics for string vibrations with other types of fastening.
The theory of injection of liquid carbon dioxide in formation, saturated system “hydrate of methane–methane” in the mode of formation of the intermediate melt zone
Authors: Shagapov V.Sh. , Khasanov M.K. , Bayramgulova R.S.
Published: January 2018

The scheme and the corresponding theoretical model of process of methane replacement by liquid carbon dioxide at his injection in a gas hydrate layer are offered. The flat one-dimensional automodel solution corresponding to injection of carbon dioxide in semi-infinite layer through flat border is constructed. It is fixed that such solution can contain three characteristic zones in general case: the far zone, where there is a methane filtration in the porous medium which is partially saturated by methane hydrate in the absence of phase transitions; the melted zone of products of decomposition of methane hydrate (water and methane) can be formed in the intermediate zone (this zone is formed because of heating owing to injection of warm carbon dioxide); the near zone where there is a filtration of liquid carbon dioxide in the layer which is partially saturated by hydrate of carbon dioxide. The analysis of influence of parameters of layer, his initial state (temperature, pressure and hydrate saturation) and the parameters of the injected dioxide of carbon on the various modes of filtration is conducted.
The mathematical model of the carbon dioxide burial in the reservoir saturated with hydrate
Authors: Musakaev N.G. , Khasanov M.K.
Published: January 2018

The mathematical modeling of the carbon dioxide injection into the reservoir initially saturated with methane and its hydrate was carried out. The system of equations, which is describe the heat and mass transfer processes in porous medium, was obtained using the methods of mechanics of multiphase systems. The assessment of the conditions under which we can neglect the kinetic mechanism of the formation of gas hydrate and diffusion mixing of carbon dioxide and methane is presented.
Effect of acoustic exposing on blood flow in microchannel simulating stenosis
Authors: Akhmetov A.T. , Sametov S.P. , Valiev A.A. , Rakhimov A.A.
Published: January 2018

The work is dedicated to problems connected with blood clot formation and study of blood flow features in vessels with stenosis. Using high-speed recording an analysis of flow structure of biological dispersion (blood) in acoustic field of mild intensity is made. It carried out in microchannel simulating a blood vessel with stenosis made and using soft lithography technology. The flow is arranged at constant pressure drop provided by hydrostatic pump in a range of 100–800 Pa. It was found a strong influence of acoustic field on a dynamics of blood flow in a microchannel at the range of frequencies 20–500 kHz and amplitudes below than 50 kPa. Results show reciprocating movements of flow in a region of microchannel narrowing. It is found a possibility of ultrasound field impact on blood clots formed in region of vessels stenosis.
Simulation of the operation of the gas refrigerator recurrent complicated ethylene polymer deposits
Authors: Urazov R.R.
Published: January 2018

The work based on the methods and equations of mechanics of multiphase media, the resulting system of ordinary differential equations, describing hydrodynamic and heat and mass transfer processes in counterflow heat exchangers type “pipe in pipe”, where the inner tube flows a mixture of ethylene and polyethylene, and in the annular space counter-current moves water. For gas mixtures is complicated by the “sticking” of liquid polyethylene on the walls of the pipe. In describing the process of formation of the polymer film is considered one of the possible mechanisms for the admission of liquid polyethylene particles from the turbulent core to the surface of the pipe, the turbulent diffusion. The results of studies on the dynamics of accumulation of the plastic film on the inner surface of gas refrigerator returnable ethylene. It is established that the formation of the profile of sediments is complex: the maximum film thickness is shifted to the output section of the channel.
Microfluidics of blood in blood vessels stenosis
Authors: Akhmetov A.T. , Valiev A.A. , Rakhimov A.A. , Sametov S.P. , Habibullina R.R.
Published: January 2018

It is mentioned in the paper that hydrodynamic conditions of a flow in blood vessels with the stenosis are abnormal in relation to the total hemodynamic conditions of blood flow in a vascular system of a human body. A microfluidic device developed with a stepped narrowing for studying of the blood flow at abnormal conditions allowed to reveal blood structure in microchannels simulating the stenosis. Microstructure change is observed during the flow of both native and diluted blood through the narrowing. The study of hemorheological properties allowed us to determine an increasing contribution of the hydraulic resistance of the healthy part of the vessel during the stenosis formation.
Stationary fluid convection modes with a Gaussian viscosity dependence of temterature
Authors: Kuleshov V.S.
Published: January 2018

The results of a numerical modeling of thermo-gravitational convection of abnormally thermo-viscous fluid in a closed square cavity with two vertical adiabatic walls and two horizontal isothermal walls are presented. A model Newtonian liquid for which the dependence of viscosity on temperature is described by a bell function (Gaussian curve) is considered. The natural convection of inhomogeneous liquid is described by the closed mathematical model based on the continuous mechanics equations written in Oberbeck-Boussinesq approximation, where the fluid density is a linear function of temperature. To simulate the fluid flow dynamics, the modified computer code based on the implicit finite volume method and SIMPLE-type algorithm with the second-order temporal accuracy is realized using multiprocessor technology. The effect of the viscosity abnormality on stationary modes of convective flows are studied, the integral heat transfer coefficients in a flat cell are calculated.
Peculiarities of heating of thermo-poroelastic media
Authors: Ilyasov U.R.
Published: January 2018

The problem of heating of liquid saturated thermo-poroelastic media, without taking into account the phase transitions are solved. Self-similar solutions describing the pressure field, temperature and stress of the porous skeleton are obtained. The dependence of the thermal impact on the parameters of the external action and properties of the medium is studied. It is shown that near of the heating boundary of a porous media, skeleton are tested both compressive and tensile stress. It was found that the main factor affecting the value of the stress-strain state is the thermal expansion of porous media.
Mathematical modelling of injection gas hydrate formation into the massif of snow saturated the same gas
Authors: Shagapov V.Sh. , Chiglintseva A.S. , Belova S.V.
Published: January 2018

Considered the problem of gas hydrate formation during injection of cold gas in the snow massif, initially saturated with the same gas. In work some limited scheme according to which, intensity of hydrate formation is limited by diffusion of gas through the hydrate layer formed between the phases of gas and ice, to the boundary of contact ice-hydrate, and is determined by the introduction of only one parameter the given diffusion coefficient. Shows the distributions of pressure, temperature, hydrate saturation and the saturation of the snow at different points in time. Held influence analysis of the effect of the pressure of the injected gas and the permeability of the snow massif on the intensity of hydrate formation.
The high-performance technique for solving an explicit finite-difference problems on the MPI technology
Authors: Mikhaylenko C.I.
Published: January 2018

The technique for high-performance computing cluster architecture using messaging passing interface (MPI) is presented. The technique is based on the spatial domain decomposition. It is shown that when calculating multistage each spatial subregion separate process can achieve a multiple number of computational processes linear growth performance multiprocessor applications up to the start time / end of the computational process. An assessment of the minimum amount of computational grid points attributable to each computational process, at which the linear increase in performance.
Bubble flow formation regimes in viscous liquid
Authors: Vorobyev M.A. , Kashinskiy O.N. , Lobanov P.D. , Chinak A.V.
Published: January 2018

The experimental study of the process of bubble detachment from a single capillary in downward liquid flow was performed. The glycerin was used as a working liquid. In order to study the effect of physical properties of liquid on the formation of bubbles experiment was conducted at different temperatures. Presented average bubble size is depended on parameters such as gas flow rate, temperature and volume velocity of liquid, as well as the capillary diameter. The data about the most characteristic mode of formation of the gas-liquid mixture was obtained. It is shown that coalescence of bubbles near the capillary is the process that determines the type of bubbles size distribution in the fluid flow. The regimes of bubble formation most suitable for the generation of a monodisperse, and bidisperse gas-liquid mixture are presented in the study.
To the theory of acoustic scanning of pipelines with the damaged areas
Authors: Shagapov V.Sh. , Galiakbarova E.V. , Khakimova Z.R.
Published: January 2018

The evolution of the pressure disturbances propagating in the tubular channel filled with liquid or gas and having a damaged portion in a sufficiently large gaps with low resistance. To this end, it adopted a mathematical model that takes into account the viscous friction and heat transfer in a thin layer of liquid (or gas) near the wall. On the basis of this model, dispersion equation for distribution processes and reflections from the damaged portion of harmonic waves. The dependence of the phase velocity, attenuation coefficient, as well as the reflection and transmission coefficients of the angular frequency and the physical properties of a liquid or gas. The results of calculations to illustrate the dynamics of pulse signals depending on the magnitude of damage, defined as the ratio of the gap area to the sectional area of the channel.
Steady flow a highly concentrated emulsion in a cylindrical channel with stepped constriction
Authors: Vorobyev N.A. , Valiev A.A. , Akhmetov A.T. , Urmancheev S.F.
Published: January 2018

In experimental studies it was found that the effect appear during flow not only in technical emulsions, but also emulsions from simple chemical compounds. It was also suggested that in the region of narrowing of the channel, there is accumulation of particles in the dispersed phase, as a result occurs dynamic blocking. A mathematical model of the flow of a highly concentrated emulsion in a channel with a stepped constriction is constructed.
Collapse of weakly nonspherical cavitation bubble
Authors: Aganin A.A. , Toporkov D.Y.
Published: January 2018

Possibility of realizing shock waves in a single cavitation bubble and the growth of bubble nonsphericity during its collapse in water, acetone, and tetradecane are studied. The radius of the bubble is 500 μm, the liquid pressure and temperature are in the ranges of 1–100 bar and 293–313 K, respectively. A relatively simple mathematical model is used in which the movement of the interphase boundary is governed by the Rayleigh-Plesset equation. The thermodynamic parameters of the vapor are assumed uniform, the state of the vapor being described by the modified Van der Waals equation. The calculations show that the shock waves inside a bubble in tetradecane are found to arise in all the conditions under consideration. Inside the bubble in acetone they do not appear at relatively low pressures while inside the bubble in water they never arise. Sphericity perturbations of the bubble grow to the highest degree in tetradecane (up to several thousand times) and to the smallest degree in acetone (up to several tens of times). In the case of water the perturbations increase up to a thousand times.
Argumentation of Application if Quasi-Stationary Model to Describe the Periodic Regime of Oil Well
Authors: Topolnikov A.S.
Published: January 2018

In the paper the argumentation of application of quasi-stationary model of gas-liquid flow is presented to describe periodic regime of oil well operating. It is shown that this simplification actually does not affect the solution accuracy, but allows to essentially diminish the calculating time. In view of the considered problem specification the transition from non-stationary model of media to the quasi-stationary model greatly increases the computational speed, which is the necessary condition for execution the optimization calculations.
On conservation laws for a viscous fluid
Authors: Khabirov S.V.
Published: January 2018

The equation of motion of viscous fluid have the divergence type of the conservation laws and admit the infinite Lie algebra of point symmetries. Canonical operators of the algebra give rise to conservation laws of the first order. This was tested for the basic operators of admitted algebra. Any conservation law may be turned by doing some canonical operator on the nontrivial conservation law. The canonical operators of the zero order of conservation laws were calculated. The problem about the calculation of canonical operators of the first order of conservation laws are supplied.
Schemes of the second order accuracy for computing the dynamics of disturbances in an elastic body
Authors: Aganin A.A. , Khismatullina N.A.
Published: January 2018

The efficiency of the second-order accurate UNO- and TVD-modifications of the Godunov method is compared using a number of problems on the propagation of linear waves in an elastic body, their interaction with each other and with the surface of the body. In particular, one-dimensional problems having analytic solutions and a two-dimensional problem of the dynamics of a body in the vicinity of the impact domain on its free surface are considered. It is shown that if in the problems there are well-marked extrema or short waves, then the UNO-scheme is more effective, since in such cases decrease in the accuracy of the TVD-scheme becomes apparent due to strictly satisfying the TVD condition. Because of approximately satisfying the TVD condition, the UNO-scheme can lead to the appearance of oscillations of numerical nature at the level of approximation errors. However, this does not reduce the efficiency of the UNO scheme since the amplitude of those oscillations decreases with refinement of the grid.
Dynamics and acoustics of polydisperse gas-droplet and bubbling media. Theory and experiment
Authors: Gubaidullin D.A.
Published: January 2018

The results of theoretical and experimental studies of wave dynamics and acoustics of gas-droplet and bubbling media are presented. The propagation of weak waves in the vapor-gas polydisperse media (with an arbitrary distribution function of the size of inclusions) and discrete multifraction droplet and bubbling media with phase transformations is studied. Mathematical models have been developed, dispersion relations have been obtained, high- and low-frequency asymptotics of the damping coefficient have been studied, and the areas of applicability of the developed theories are discussed. Good agreement of the presented results with the published experimental data by other authors is shown.

The nonlinear oscillations of gas suspensions and the dynamics of particles in tubes in the shock and shockless regimes as well as in the transient wave one have been experimentally studied. The resonance character of the droplet deposition with the oscillation frequency and the possibility of effective acoustic deposition of the most problematic submicron drops are shown. Based on the fast Fourier transform algorithms, the acoustic signal distortion during the diagnostics of a multilayer sample containing a liquid layer with polydisperse bubbles has been calculated. Good agreement between the theoretical and experimental data has been obtained.
Investigation of scattering from soundproof single sphere under external influence
Authors: Nasibullayeva E.Sh.
Published: January 2018

The scattering from a single soundproof sphere is investigated during the passage of two types of waves: a spherical wave from a monopole radiation source and a plane wave. In solving the Helmholtz equation, a numerical technique based on the fast method of multipoles is used, which allows achieving high accuracy of the results obtained, and also minimizing computer time. The calculations are compared with known experimental data and a good agreement is obtained. Formulas are obtained for the main characteristic of the scattering field (the total scattering cross-section) for a sphere with an arbitrary acoustic impedance. Its dependence on the main parameters of the ”sphere – environment“ system for two kinds of the incident field is shown. A numerical parametric analysis of the value of the potential on the surface of a sphere for different values of its radius, complex impedance, the type of external influence, etc.