Ma’lumotlar bazalarida indekslashning afzalliklari va kamchiliklari

Indekslash ma’lumotlar bazasi ish faoliyatini optimallashtirish uchun kuchli vositadir. Indekslardan to‘g‘ri foydalanish so‘rovlarning bajarilishini sezilarli darajada tezlashtirishi va tizimning umumiy samaradorligini oshirishi mumkin

Device for measuring the magnetic scattering field of the frontal part of the stator winding of a traction asynchronous electric motor of an electric rolling stock

The article deals with the issues of improving the energy efficiency of mainline locomotives with asynchronous traction motors by determining the characteristics of the traction drive using a device for measuring the magnetic scattering field of the frontal part of the stator winding

Advantages Of Introducing Agrocluster In Agriculture

Today, the sustainable development of agriculture depends largely on increasing its competitiveness. An important factor in this direction is the establishment of agro-clusters in Uzbekistan. This article highlights the ongoing agrarian and economic reforms in the agricultural sector and the organization of agroclusters in the development of the sector, as well as the role of infrastructure in it

Creating a Favorable Environment for Attracting Foreign Investment and Strengthening Its Legal Framework

This article examines the impact of foreign investment on the national economy of Uzbekistan, the creation of favorable conditions for attracting investments and doing business, strengthening the legal guarantees for the protection of the legitimate interests of entrepreneurs. &nbsp

RESULTS OF NUMERICAL RESEARCH OF DISCHARGE CAPACITY OF A SPILLWAY WITH A WIDE THRESHOLD

The problem of dramatically changing river flow in the reaches of hydro-technical structures is considered in the paper. The discharge capacity of these structures is determined by the well-known formula of a spillway with a wide threshold based on the Saint-Venant system of equations. It was stated that the Froude number in an undisturbed flow increases at the narrowing of the channel and decreases with its widening, and in a turbulent flow the Froude number decreases with the narrowing of the channel, and increases with its widening. Proceeding from this, the transition of a flow from a calm regime to a turbulent one can occur only when the form of the channel transfers from a narrow form to a wide one; in the narrowest section of the channel flow, the Froude number and the kinetic parameter is Fr=Pk=1,0. The characteristic features of the flow coefficient of a spillway with a wide threshold are identified and a recommendation is given for its determination. The main factor that affects the discharge capacity of a spillway with a wide threshold is analyzed. It is determined by the product of the values of the hydraulic resistance and compression coefficients in the inlet of the structure