Transportation

The aim of the research work is justification of parametres of frame structures of vehicles of category 03.
Scientific novelty of the research work is as follows: the geometric parameters of the tractor trailer and its frame structure are justified; developed methods for calculating the strength characteristics, performance and durability of the frame structure of an auto tractor trailer; the formula for calculating the lifetime of the trailer frame made of steel rolled products of various grades was improved by introducing a correction factor; the formula for estimating the longevity of the trailer frame is improved on the basis of the Weibull distribution and the power equation of the fatigue curve.

Annotatsiya:  Hozirgi  kunda  yurtimizda  IT  sohasiga  bo‘lgan  e’tibor  ancha kuchaygan.  Dasturlashga  qiziquvchilar  va  uni  o‘rganishni  boshlaganlar  soni  ortdi.  IT  firmalar  o‘ziga  ishchi  qidirishda  mutaxasisning  tajribasi  katta  bo‘lishiga  va  real loyihalarda ishlaganligiga alohida e’tibor qaratishadi. Endigina kursni bitirgan yosh dasturchida  bu  ko‘nikmalar  bo‘lmasligi  tabiiy  va  ular  ishga  kirishda  turli  xil qiyinchiliklarga  duch  kelishadi.  Amaliyotchi  dasturchi  sifatida  endi  ish  boshlagan yangi firmalarga ishga kirishlari mumkin. Ammo, bu narsa odamdagi dasturlashga bo‘lgan  motivatsiyasini  o‘ldiradi.  Chunki,  endigina  ish  boshlagan  dasturlash firmalarida  buyurtmalar  bo‘lmaydi.  Dasturchilarga  yetarli  miqdorda  maosh  berisha olmaydi. Bizning platforma shu muammoga yechim topish uchun ishlab chiqilgan.

Irrigation technology is an essential aspect of setting up and maintaining an attractive and healthy landscape alongside motorways the proper use of irrigation technology can ensure that the vegetation along the motorway remains green and lush, even during periods of drought or water restrictions. It can help to reduce erosion along the roadside and prevent soil compaction, which can have a negative impact on plant growth. Moreover, irrigation technology can be used to manage the runoff of rainwater and prevent it from draining directly into the motorway, which can cause flooding and other issues, vegetation, soil, and water supply in the area.

The expert system for automatic control of train traffic belongs to the class of information systems of automation and tele mechanics. The model, which reflects the informational links between the main goal and the characteristics of the automatic train control system, is informational. It can be used to conduct a qualitative analysis and synthesis of the system.

A number of diseases are known in dentistry, the occurrence and development of which is closely related to the function of the endocrine glands. The study of this important problem was begun about 60 years ago, but to date, many questions of the influence of enlocrine diseases on the dentition have not been sufficiently studied, and the data obtained are often contradictory.
When studying changes in the dentition, the duration, severity of the underlying disease, as well as the features of the function of the endocrine glands in different periods - pre-pertinent, pubertal and menopause, were often not taken into account.
In recent years, a large amount of clinical material has been accumulated on the condition of teeth and periodontal tissues in various diseases of the endocrine glands, and their influence on the growth and development of the facial skeleton. A large number of experimental works have been carried out and the effect of individual hormones on tooth tissues, mucous membranes and bone tissue has been studied.

The aim of the research work is to improve the operational reliability of the petrol engine's injection system in hot climatic conditions.
Scientific novelty of the research work is as follows: the regularity of the change in density is improved, the distribution of the reliability indices of the injection system of food from the influence of the environment; the dependence of the failure rate of elements that limit reliability on the rate of change in the oxidation of fuel under the influence of the environment is established; the changes in the quantitative values of the failure rate were determined to predict the resource of the injection power system; the periodicity of maintenance is determined to improve the technical performance of elements that limit reliability.

This article discusses the goals and objectives of landscaping highways, sanitary and hygienic conditions, as well as improving mechanisms for improving the infrastructure of urban street roads..

Subjects of the inquiry: engines of cargo trucks re-equipped for working on compressed natural gases (CNG) and used in foothill and mountain conditions.
Aim of the inquiry: Increase of efficient application of gas balloon automobile engines by means of automated power loss compensation systems during their performance in mountain and foothill conditions.
Methods of the inquiry: theoretical research with the body of regressive mathematical analysis application realized on the computer has been carried out in this scientific work; besides, laboratory road and service tests have been completed.
The achieved results and their novelty: is based on the practical analysis of the existing methods of power increase in internal combustion engines (ICE) under mountain and foothill conditions. The method of air and fuel flow control has been chosen by supplementary air supply and by controlling gas fuel supply under pressure. The proposed method allows to supply additional volume of air to the inlet stroke in accordance with reducing the pressure of environment and increasing the load on the ICE. Thus the use of the above method provides normal performance of automobiles with gas balloon engines in mountain and foothill conditions without changing their engine design.
Practical value: according to the results of the gas balloon automobiles experimental studies, their power and economical indexes in mountain and foothill performance conditions have been evaluated. Besides, compensation ways of power losses for gas ICE have been worked out with the account of external factors. Correcting coefficients for improving the accuracy of engines indexes in mountain and foothill performance conditions have been suggested in the above research work.
Degree of embed: the results of the thesis have been introduced at Automobile Enterprises of the Republic and arc also used in the course of training graduate students on specialty “Operation Service and Testing of ICE”.
Sphere of usage: Automobile Engineering and Automobile Transport.

The aim of research work is consists in improvement of technologies hydra transport settled alluvium in basin and hydra transport river alluvium in pressure pipe line with different gradient.
The novelty of the researches as follows:
it is designed new design of the jet device, providing hydra transport river alluvium in pipe line with inverse gradient;
motivated influence to energy of the flow on process of the transport river alluvium in pipe line with inverse gradient with account gravitation and reception capacity of the pipe line with account of the mode of the motion
they are motivated constructive parameters designed jet device for peelings basin from river alluvium with account of the pressure of water;
advanced method of the determination to critical velocity bears a suspension flow in pressure pipe line with inverse gradient with account of the turbidities.

This article covers the importance of planning the cargo and passenger transport system of the region in terms of the functional planning of the transport system in cities.

This article envisages the creation and maintenance of an internet platform that accepts software orders based on supply and demand. The main goal of the theme is to guarantee the maximum ideality of the client’s work.

The development of agricultural exports is one of the prerequisites for increasing the export potential of
the Republic of Uzbekistan. Therefore, the Strategy for the Development of Agriculture of the Republic of Uzbekistan for 2020-2030 provides for a significant increase in agricultural exports, i.e. up to $ 20 billion by 2030. And this, in turn, necessitates improving the practice of financing the export of agricultural products. The article identifies problems associated with improving the practice of financing the export of agricultural products in the republic and develops scientific proposals aimed at solving these problems.

Railway operators today face countless challenges. Therefore, to ensure fast and reliable communication between cities in different countries, promising alternatives to air and road transport are required. In the modern world, high-speed rail transport, when organizing mass transportation, confidently occupies a transport niche in the distance range of 400-800 km, providing the least total travel time, i.e. the highest overall travel speed for passengers with the highest safety, comfort and economy indicators.

The article talks about the roads of the city of Samarkand, traffic flows, existing infrastructure and conducts a theoretical analysis. We are also talking about the nature of decisions and regulations on the development of the city of Samarkand, adopted by the President of the Republic of Uzbekistan and the Cabinet of Ministers.

The urgency and relevance of the theme of dissertation. Now in the world of one of problems of global character is an increase of pollution of atmospheric air as a result of the intensive growth of motorization and development of the industry. The motor transport and the enterprises of transport infrastructure are a powerful source of environmental pollution by greenhouse and toxic gases. Today the car fleet numbers more than 1 billion of cars, the share of road transport in the amount of global greenhouse gases emission is 13%'. Protection of the atmosphere from greenhouse and other gases presents a problem of global importance for which solution first of all it is necessary to solve a problem of an exact assessment of number of emissions.
After achievement of independence by our country the special attention is paid to questions of environmental protection. As well as in all branches of economy in the field of environmental protection large-scale reforms are carried out. In the republic the stage-by-stage action programs on environmental protection are regularly adopted and carried out.
In the conditions of rapid development of an automobile and road complex and change of environmental conditions the need of further increase of environmental monitoring efficiency, based on improvement of the existing methods of greenhouse and other gases emissions inventory is created. In the conditions of sustainable social and economic development further improvement of organization methods of inventory of greenhouse gases and other harmful substances emissions from automobile and road complex, and also systems of environmental monitoring is an actual problem, and their decision has great scientific and practical value.
The dissertation to some extent may contribute to solve problems defined in Resolutions of the Cabinet of the Republic of Uzbekistan: No. 389 “About questions of implementation of the action program on environmental protection of the Republic of Uzbekistan” dated October 9, 2000; No. 212 “About Programme of Action for the protection of environment of the Republic of Uzbekistan for 2008-2012” dated of September 19, 2008; No. 292 “About the approval of the Program of the State monitoring of environment of the Republic of Uzbekistan for 2011-2015" dated October 30, 2011 and also “Programme of action for the protection of environment of the Republic of Uzbekistan for 2013-2017” approved by the Resolution No. 142 of the Cabinet of the Republic of Uzbekistan on May 27, 2013.
The aim of research work is improvement of a method of an assessment of impact of the “road-vehicle” system on the air environment depending on road pavement conditions.
Scientific novelty of the research work is as follows:
the monitoring method of the emissions from “road-vehicle” system taking road pavement condition and traffic flow into account is improved;
the method of road condition’s definition is improved by differentiation of the road pavement condition and taking parameters of environmental pollution due to greenhouse and toxic gases emission into consideration;
the evaluation method of gross greenhouse gases emissions from automobile -road complex is developed;
the road-service quality of the roads pavements is justified as an evaluation criterion of ARC emission taking road pavement parameters, such as evenness, strength, wear resistance and pavement type into account
CONCLUSION
Theoretical and experimental studies lead to the following conclusions:
1. On the basis of system analysis of changes in the state of road cover during life cycle of the road, the character of traffic flow and changes of emission amount, a structure of the system of environmental monitoring with subsystems of prediction and management. The use of cluster sampling of the objects of monitoring is proposed, as well as the use of indirect index - the road evenness to conduct ecological assessment.
2. Mathematical dependence of allowable car speed on road surface evenness and the dependence of vehicles emission on evenness are specified.
3. On the basis of numerical experiments a correlation between the evenness of road surface and emissions from various processes of road complex is established. By computer modeling and interpolation using Newton's method, a mathematical model is obtained that relates pavement evenness, density of vehicle traffic and emissions of road complex. It was found that road operation with unsatisfactory state of road surface causes a significant increase in emissions (at evenness IRI 10 emission amount will increase by 16% compared with IRI 5).
4. Fundamentally new method of monitoring of “road-vehicle” system emissions is worked out; it is based on the control of road conditions and traffic flow. On the basis of this method a technique is created for monitoring and greenhouse gas inventory of the system “road-vehicle” for public roads of Uzbekistan. Proposed method of road monitoring for emission inventory and excess emissions determination can be used at present, and serve as a methodological basis in development of new techniques that will be elaborated with changes in vehicle design, the fuel used and the technology of road repairs.
5. Integral model that ensures the finding of ecological and economic optimum of car roads state is modified. Damage caused to environment by emissions during life cycle of asphalt roads is estimated, approximately 105,893,500 USD/year.
6. Ecological and economic efficiency of the implementation of the developed recommendations for change of permissible evenness: for roads with capital type of coverage from 99.2 to 392.2 USD/km-year with traffic respectively from 5,000 to 10,000 cars/day; for roads facilitated type from 248.7 to 407.5 USD/km-year with traffic, respectively, from 3,000 to 4,400 cars/day.

Ushbu  maqolada  qisqacha  suniy  intellektning  XX  asrga  kelib keskin rivojlanishi va uning qo‘llanilish soxalari ko‘rib chiqilgan. Bunda asosiy urg‘u ekspert  tizimlarini  yaratishda  bilimlar  omborining  ahamiyati  va  vazifalariga keltirilgan. Bilimlar omborini ishlab chiqish, semantik, freym va rasmiy mantiq kabi namoyish  modellarini  o‘rganishga  bag‘ishlangan.  Bu  modellarga  doir  jadval, rasmlar, modellarning avzaligi va kamchiligi keltirilgan.

Specific soil-climate conditions for the operation of tractors in cotton farming are one of the main reasons that lead to a decrease in the operational durability of agricultural tractors and an increase in their maintenance costs. Techniques used in the cultivation and cultivation of cotton between the rows work in different conditions, conditionally divided into three sub-zones. The topography of the first subzone includes foothills with slopes and relatively high atmospheric precipitation. The terrain of the second subzone covers the low-rainfall foothills. The third sub-zone includes lands with weakly pronounced slopes and soils with varying degrees of salinity.

Ushbu ishda jin mashinasining ishchi qismlaridan biri amaldagi va yangi tavsiya qilinayotgan tarkibli kolosniklar “Chust elita urug‘chilik xo‘jaligi” MChJ korxonasida mavjud bir xil bo‘lgan, DL-10 jin mashinasiga kolosnik panjaraga o‘rnatib, bir xil vaznli Namangan 34 III sanoat navida eksperimental tadqiqot ishi o‘tkazilgan. Tadqiqotdan maqsad, tarkibli kolosnik ishchi yuzasini o‘zgartirilgandan so‘ng aniqlangan natijalarni chuqur tahlil qilish, amaldagi va tavsiya qilinayotgan kolosniklardan chiqqan natijalarni solishtirish va tola hamda chigitni xususiyatlarini yaxshilashdan iborat.

The article examines how the development of transport infrastructure affects the increase in the competitiveness of the economy of Uzbekistan. A detailed analysis of the current state of the transport infrastructure in the country is carried out. Possibilities of improvement and improvement of indicators of efficiency of functioning of this sphere are revealed.

The aim of the research work is development of technology for the production of carbide roll with the use of refractory metal powders.
Scientific novelty of the research work. The scientific novelty of the research is as follows:
the advanced technology of manufacturing of a hard-alloy roller of an input box of a stand is developed by a method of powder metallurgy;
the technology of obtaining a hard-alloy forming tool with an optimal combination of strength and plasticity has been developed;
the optimum composition of 60% TiC, 20% Ni, 4% W, 4% Fe molybdenum new alloy of the Mo-TiC-Ni-W-Fe system was developed to impart strength and ductility to the rollers;
the composition of 39% Mo, 42% TiC, 12% Ni, 4% W, 4% Fc of the Mo-TiC alloy was developed to provide the wear resistance of the rollers.

The  article  developed  a  procedure  for  managing  stocks  and algorithms  based  on  stock  management  models.  Recommendations  for  the development of an enterprise stock management algorithm are given.

This article describes new technologies and materials that have passed the world experience and are currently being tested to restore the water absorption coefficient of the road surface.

This article analyzes the efficiency of the transport-logistics system and the factors affecting them. Also, in order to determine and calculate the ways and perspectives of the transport-logistics system development, efficiency improvement factors, opportunities, organizational-economic mechanisms, and the need to study exactly what factors affect these services and to what extent, and these factors can be grouped differently, and they are explained depending on the efficiency of which of the market participants is being determined.

Ushbu maqolada mobil ilova yordamida ma’lumotlar bazasidan ma’lumotlarni  o‘qish,  qayta  ishlash  va  uzatish  jarayonlari  C#  dasturlash  tilini o‘rganish ma’lumotlari misolida ko‘rib chiqilgan. Buning uchun java dasturlash tilida mobil ilova yaratilgan, MySQL ma’lumotlar bazasida ma’lumotlar to‘ldirilgan va ilova yordamida ushbu ma’lumotlar bazasi boshqarilgan.

The article discusses issues of design and construction of city streets, including the implementation of the transport system, presents city streets, their elements, classification, types, urban transport, automobile parts, transport and issues of organizing pedestrian traffic.