Digital Commons Network^™

Structure Analysis Of Pemfc Cathode Catalyst Layer, Rui-Qing Wang, Sheng Sui

Journal of Electrochemistry

The sluggish oxygen reduction reaction (ORR) on the cathode of the proton exchange membrane fuel cell (PEMFC) has always been one of the key factors limiting its commercialization. The optimization of the cathode catalytic layer structure plays an important role in improving fuel cell performance and reducing production costs. In this paper, two different catalysts (platinum nanoparticles (Pt-NPs) and platinum nanowires (Pt-NWs)) were prepared by using catalyst coated substrate (CCS) method. By constructing a double-layer catalytic layer structure, we analyzed the effect of different catalytic layer structures by performing a single cell test. The results showed that the dense platinum …

Formation And Morphological Evolution Of Nanoporous Anodized Iron Oxide Films, Jin-Wei Cao, Nan Gao, Zhao-Qing Gao, Chen Wang, Sheng-Yan Shang, Yun-Peng Wang, Hai-Tao Ma

Journal of Electrochemistry

The preparation of iron oxide films with nanoporous structure by anodization has attracted much attention for its potential applications. However, the formation mechanism of porous structure during anodization is still unclear. In this paper, the composition of anodic current during the formation of nanoporous anodized iron oxide film was analyzed in combination with the current density-potential response (I-V curve) and the derivation of Faraday’s law. The results showed that the anodic current consisted of an ionic current (leading to the migration of ions to form oxide) and an electronic current (leading to the oxygen evolution), and the …

Strategies To Maintain Fuel Security In Palestine, Suhaila Abu Ghoush, Ahmad Sadaqa

Journal of the Arab American University مجلة الجامعة العربية الامريكية للبحوث

Fuel plays a key role in many aspects of life, particularly in any country’s national security. However, energy insecurity leads to economic and political instability. In this study, the researcher investigated the strategies used to maintain fuel security in Palestine in order to define the challenges facing Palestine’s fuel security, while exploring geopolitical variables and their impacts, investigate the territory’s fuel storage policies and find out the potentiality to build fuel security infrastructure. To achieve those purposes, the researcher used a combination of descriptive and comparative approaches. More specifically, the researcher compared the Palestinian circumstances with the circumstances of other …

A System And Method For Providing Digital Trasaction In Offline Mode To Prevent Double Spending Problem, Gokul Anand Manimaran Mr

Defensive Publications Series

Present disclosure provides a system and method for providing a platform to perform digital transaction in offline mode using virtual coins. The system may include network server (107) which is configured to generate virtual coins when the customer (102) requests for generating virtual coins. Each virtual coin includes unique virtual identification number and Universally Unique Identifier (UUID that ensures each coin cannot be spent more than once, preventing double spending problem. Thus, secured cashless transaction is performed in offline mode using the generated virtual coins. Further, network server (107) is configured to process payment transaction claim request received from the …

Mathematical Model Of The Efficiency Of Investments Aimed In The Implementation Of Water-Saving Technologies

Irrigation and Melioration

In Uzbekistan, research work is being carried out aimed at improving the economic mechanisms for the introduction of water-saving technologies for irrigating agricultural crops. At the same time, the issues related to the analysis of the effectiveness of the use of water-saving technologies when irrigating cotton, the development of mathematical methods for assessing the effectiveness of investments, as well as their introduction into practice have not been sufficiently studied. This article provides a mathematical model of the efficiency of investments aimed at introducing water-saving technologies. The results of a numerical experiment of a mathematical model show that the introduction of …

Efficient Use Of Water Resources In The Basins Of Small Rivers, F. Gapparov, M.F. Gafforova

Irrigation and Melioration

The article provides a recommendation for the efficient use of water resources in the basins of small foothill rivers. The research was carried out on the example of the Govasay river basin located in the northern part of the Fergana Valley. The efficiency factor of the canal has been determined and a technical assessment has been given for the management of water resources in the river basin; the efficiency of the canal is 65-75%. A program for the operational management of water resources in The Govasay river basin and a GIS map of water consumers in the Govasay river basin …

Model Of Groundwater Level Control Using Horizontal Drainage, A. Arifjanov, M. Otaxonov, Z. Abdulkhaev

Irrigation and Melioration

The article describes the main factors affecting the rise in the level of groundwater in the city of Fergana and ways to eliminate them. Currently, in order to reduce the negative impact of rising groundwater levels on the environment, crops, buildings and structures, as well as underground utilities, it is proposed to design horizontal drainage in urban areas and a mathematical model has been developed for changing the groundwater level. For this, long-term data from observation wells were analyzed and the hydraulic parameters of horizontal drainage were selected taking into account the hydrogeology of the area. Taking into account the …

Hydraulic Calculation Of A Resource-Saving Jet Water Lift, D Abduraimova, M. Atakhanov, S. Melikuziyev, D. Bakhromova

Irrigation and Melioration

The article discusses an improvement method based on the laws of flow in the development of resource-saving devices on the basis of an analytical analysis of research on the use of jet water lifters in the national economy. The hydraulic parameters of the jet water elevator are theoretically substantiated, the dependences obtained are experimentally verified. On the basis of the experiments carried out, the economic parameters of the jet water lift were determined. The laboratory jet water lifting device is intended for pumping water from a well from a depth of 1 m to a height of 2 m. The …

Results Of Proximate Analysis Of Energy Use Of Municipal Solid Waste, N.N. Abduganiev

Irrigation and Melioration

In the modern industrialized world, various raw materials are processed and used for human consumption. While some of the raw materials are converted into the desired product, the rest is thrown into the environment as waste. It is known that solid waste is a type of biomass that is formed in the course of human life. The article presents the results of a preliminary analysis of studies on the use of solid waste energy in the Urta-Chirchik district of the Tashkent region. Sorting results showed that the total volume of municipal solid waste in the district consists mainly of wood …

Shredding Of Cotton Stalks Under The Action Of Toothpicks In A Combined Unit, B. Khudayarov, U. Kuziev, B. Sarimsakov, М. Kholbutaev

Irrigation and Melioration

The article presents materials devoted to the justification of the parameters of the crown-wheel of the combined aggreagate. The technological process of work and the design of the working part, which is crushed by crushing cotton stalks, without breaking them, laying them on the movement of the unit, has been substantiated and developed. The optimal parameters of the crown-wheel and the tooth are determined by solving the regression equations that determine the optimal values of the vertical load on the teeth and its working quality. The results of theoretical and experimental research show that the amount of crushing of cotton …

Influence Of Electrophysical Methods On The Processes Of Root Formation Of Grapes, N.M. Markayev

Irrigation and Melioration

The article describes the possibilities of electrophysical processing before planting cuttings during vegetative cultivation of grape seedlings. The processes of root formation in cuttings using the electrophysical method in the article Acceleration of the process of root formation in cuttings of black raisins, treated at 71 V/m and an electric field strength of 15 hours, and an increase in the viability, quality, growth and survival of rooted seedlings up to 16.67-34% Presented the results of experiments on the increase and methods of electrotechnological processing of grape cuttings. The result of the study is the analysis and results of the processes …

Conditions, Criteria And Principles For Creating An Agri-Cultural Land Market In Uzbekistan, A.R. Nurnazarov

Irrigation and Melioration

The article analyzes the prerequisites for creating a market for agricultural land in the Republic of Uzbekistan, special attention is paid to land reform, land degradation (reduction of the bonitet score from 60 in 1991 to 50 or more at present, pasture degradation by 20-30%) and increase in economic from their use, the role of land rent in payments for land. 6 basic principles for creating a land market have been established and systematized, the relationship between X-rays and water in the irrigated farming zone, the role of the market in increasing the efficiency and effectiveness of the use of …

Economic Assessment Of The Effect Of Family Income On Students' Disciplines, Sh.A. Muratov

Irrigation and Melioration

The importance of higher education in scientific research, its role in poverty reduction and population growth has been studied theoretically. Also, when using the data of social surveys conducted by 538 respondents (students) studying in higher education institutions, they were awarded the Order of the logistics regulator in the economic assessment of the factors influencing the rate of mastery of disciplines. Factors influencing the acquisition of subjects by students: the main income of the family comes from non-farm (69,9 %), sex (52,2 %), studying at a higher education institution on a state grant (108,8 %), the student's course of study …

Numerical Simulation Of Vibration Viscoelastic Pipeline, Kh.M. Komilova

Irrigation and Melioration

The article studies the parameters of a pulsating fluid flow that lead to vibration in the pipeline. A mathematical model has been developed for the vibration of a viscoelastic pipeline based on the theory of beams when a pulsating fluid flows through it. Using the Bubnov-Galerkin method, based on a polynomial approximation of deflections, the problem is reduced to the study of systems of ordinary integro-differential equations, the solution of which is found by a numerical method. A computational algorithm has been developed for solving the problems of oscillation of composite pipelines with a flowing pulsating fluid. The influence of …

Innovative Rotor Casing And Leveling Apron For Combined Tillage Machine, A.A. Akhmetov, L.B. Muratov

Irrigation and Melioration

Investigations of the design of a combined machine equipped with an innovative casing and a leveler apron are presented, and the parameters of the leveler apron are substantiated. It was experimentally established that when the height of the drawing prism is exceeded by more than 200 mm, due to the falling of the crumbling part of the soil onto the rotor, the soil is thrown forward in the direction of the machine. Therefore, to eliminate soil waste, it is necessary either to reduce the height of the drag prism, or to increase the distance between the rotor and the leveling …

Ensuring The Uniformity Of Movement Of The Working Bodies Of The Machine For Processing Ridges In The Depth Of Travel, А. Tukhtakuziev, K.G. Abdulkhaev

Irrigation and Melioration

The article theoretically investigates the issue of identifying ways to ensure the deepening of the working bodies of the machine for processing ridges to a given processing depth and its required uniformity of stroke. The research results show that the deepening of the working bodies of the ridges processing machine to a given processing depth and its required uniformity is provided mainly due to the correct choice of the vertical distance from its reference plane to the lower connection points. The novelty of the conducted research lies in the fact that an analytical dependence has been obtained that allows us …

Develepment Of Land Market In Eastern European Countries And Experience For Uzbekistan, A.R. Nurnazarov

Irrigation and Melioration

The article examines the experience of the formation of the agricultural land market in Eastern European countries since the 90 s of the twentieth century, the problems and features of its devel-opment, the impact of the land market on the economies of countries. Particular attention is paid to the transformation of land ownership, methods of land privatization, land pricing, restrictions on land purchase, regulation of land relations in market conditions, issues of granting the right to pur-chase land to foreign individuals and legal entities, requirements for land owners for the presence of a special agricultural education or 3-5 years of …

The Developmet Of Competences Via Techniques For Enhancing Esp (English For Specific Purposes) Vocabulary Of Learners, G. Eshchanova

Irrigation and Melioration

In the article a recent trend in higher education is ESP (English for Specific Purposes) courses is discussed. These courses are designed around students’ needs based on their field of study. The goal is to strengthen students’ proficiency and help them to get ready to cope with everyday situations and deal with professionals in many fields such as: engineering, medicine, education and IT. There are many training sessions organized by international experts whose goal is to train local teachers to teach these courses successfully. In order to develop an ability to learn new vocabulary, for both general English and technical …

Development Of Girls’ Sports, A.R. Khodjanov, V.V. Mahmudov

Irrigation and Melioration

The article addresses current issues of higher education, taking into account its specifics. She has been providing appropriate advice on improving girls' physical well-being. The use of opportunities and qualities has an impact on the creation of comfortable conditions for female athletes. For girls involved in sports, the creation of impressive quality and possible conditions is considered. As a result, the girls-athletes of our institute took 2-3 places in the district and city qualifying rounds of chess, table tennis and won a ticket to the republican stage. At the republican stage, 2 female students of our team took 4th place …

The Imrovement Of Esp Teaching Via Methodical Provision At Technical Institution: Specializm-Oriented English Via Agriculture, G. Eshchanova, U. Nullaev

Irrigation and Melioration

In the given article the ways that ESP combines subject matter and English language teaching is discussed. This approach can be highly motivating for students because students are able to apply what they learn in their English classes to their main field of study, whether it be law, computing, business, tourism, etc. Being able to use the vocabulary and structures that they learn in a meaningful context reinforces what is taught and increases their motivation. Nevertheless, ESP concentrates more on language in context than on teaching grammar and language structures. Additionally, the ways of teaching English in ESL classes and …

Rapid Ac Electrokinetic Micromixer With Electrically Conductive Sidewalls, Fang Yang, Wei Zhao, Cuifang Kuang, Guiren Wang

Faculty Publications

We report a quasi T-channel electrokinetics-based micromixer with electrically conductive sidewalls, where the electric field is in the transverse direction of the flow and parallel to the conductivity gradient at the interface between two fluids to be mixed. Mixing results are first compared with another widely studied micromixer configuration, where electrodes are located at the inlet and outlet of the channel with electric field parallel to bulk flow direction but orthogonal to the conductivity gradient at the interface between the two fluids to be mixed. Faster mixing is achieved in the micromixer with conductive sidewalls. Effects of Re numbers, applied …

Response To Agency Comments Received December 15 On Silver Bow Creek Butte Area Npl Site 2022 Draft Butte Priority Soils Operable Unit Interim Site-Wide Surface Water Monitoring Quality Assurance Project Plan. Consent Decree- Civil Action No. Cv 89-039-Bu-She, Josh Bryson

Silver Bow Creek/Butte Area Superfund Site

No abstract provided.

The Guardian, Week Of December 27, 2021, Wright State Student Body

The Guardian Student Newspaper

News articles from The Guardian for the week of December 27, 2021. The Guardian is the official student-run newspaper for Wright State University. It has been published regularly since March of 1965.

Remembering Roger M. Flynt Jr., Bill Dabney, Flynt Family

University of Mississippi News

UM law endowment pays tribute to longtime telecommunications executive

Development Of A Custom Tendon Explant Frame Compatible With Reflectance Quantitative Polarized Light Imaging, Matthew Riak, Lila Dickstein

Mechanical Engineering and Materials Science Independent Study

Tendons and ligaments are collagenous tissues in the body which attenuate load. Reflectance quantitative polarized light imaging (rQPLI) is being developed to combat some of the issues present in many of the current imaging modalities used to study tendons and ligaments. To establish its utility in continuous monitoring of tendon healing, rQPLI will be used to monitor a tendon explant defect over a four week period in both normal and super healer mice strains. In this study, we discuss fabrication of a custom frame built to exert a constant force on tendon explants for these imaging studies. Additionally, the frame …

Ultrasonic Droplet Generation Of Phase Change Materials, Angelo Hawa

Mechanical Engineering and Materials Science Independent Study

Droplet-on-demand (DOD) generation is a widely studied phenomenon with useful applications across many fields in engineering. While some devices incorporate thermal or electrical aspects to induce droplet ejection, this report details the use of ultrasonic waves emitted by a piezoelectric transducer. An existing experimental setup to eject and visualize droplets was modified to incorporate phase change materials, such as wax. Simulations using COMSOL Multiphysics indicated a desired frequency range of 120 kHz to 140 kHz for a liquid layer height of 4 mm to 12 mm. However, ejection ultimately occurred briefly at an operating frequency of 178 kHz. The ejected …

Development Of Asphalt-Resin-Paraffin Deposits Solvent, Gulmira Todjiyeva, F Badriddinova, M Tursunov, H Kadirov, E Cherkasova

Technical science and innovation

A solvent which is a mixture of aromatic hydrocarbons of the C₉ fraction and aliphatic alcohols in a 1:1 ratio, a nonionic surfactant in an amount of 1 - 3% by weight has been developed. It leads to an increase in the dissolving and washing capabilities of the solvent for more than 2 times in relation to paraffin-type AS. The ability of the chemical composition, which is a solvent composition, to have a depressant-dispersing effect in relation to paraffin-type AS has been determined.

Despite a large number of studies devoted to the development of technologies for the removal of …

The History Of The Tectonic Development Of The South-Eastern Part Of The Turan Plate And The Beshkent-Kashkadarya Foothill Depression Of The Modern Tien Shan, Azamjon Zakirov, Ravshan Zakirov, Irmuxamat Khalismatov, Zakirova Feruzaxon, Borshov Victor

Technical science and innovation

The article examines the history of the tectonic development of the southeastern part of the Turan Plate and the Beshkent-Kashkadarya foothill depression, which have been studied and discussed by many researchers. The history of the tectonic development of the research area is relatively complete since the Pre-Jurassic deposits. The pre-Jurassic deposits on the territory of the Amu Darya syneclise are confined mainly to the Khiva and Zaunguz grabens, delimited by the Central Amu Darya ridge.

At the end of the Oligocene, tectonic activity increased sharply within the Turanian Plate, which included the research area. It flowed more intensively both from …

Methods Of Improving Complex Cleaning Of Sand Plugs In Khodjaobad Underground Gas Wells, Abdulaziz Murodov, Muhriddin Muydinov, Saidaziz Khabibullaev, Aziz Abidov

Technical science and innovation

The purpose of the study is to develop recommendations for improving the methods of cleaning complex sand plugs in wells of underground gas storage. To organize the correct and efficient use of underground gas storage, the bottom of wells must be kept clean. The article develops recommendations on the use of optimal methods for cleaning wells from complex sand jams on the example of Khujabad UGS. In addition, recommendations were developed for the operation of production wells in the horizons of the XX-XXI-XXII underground gas storage of Khujabad

Evaluation Of The Thickness Of Vacuum Metal And Semiconductor Coatings Using Computer Programs, Bahrom Igamov, Ilkhom Bekpulatov, Aleksey Kamardin, Tulkun Kamilov, Ilhom Turapov, D Igamova

Technical science and innovation

Comparative studies of the thickness of coatings of such metals as Cu, Ag, Cr, Co, and also Mn4 Si7 on polished substrates made of Si, Si O2 / Si structure, ST - 50 glass ceramic, mica were carried out. The coatings were deposited in vacuum using thermal evaporation and magnetron sputtering. The thickness and uniformity of deposited coatings on rotating substrates are estimated by optical measurements and computer simulation. Mathematical models for the formation of coatings on flat substrates have been developed. The possibility of the optimal position of the substrate for the formation of functional coatings uniform in thickness …