Formation of Diffusion Coatings Based on Nickel and Chromium in the Medium of Fusible Liquid Metal Solutions on Austenitic Steels

The technology of diffusion saturation of austenitic steels by chromium and nickel in the medium of low-melting liquid metal melts is shown. The saturation temperature was up to 1050°C, and the duration was up to 8 hours. It was found that it is the most effective to apply coatings according to the technological scheme: pre-carburization-diffusion metallization – final carburization. It was found that the coating consists of 4 layers. The surface layer has a thickness of up to 5 mkm and a microtuberance of up to 19500 MPa. The second layer, up to 12 mkm thick, has a microhardness of up to 7500 MPa. The third, up to 50 mkm thick, has a microhardness of 2300 MPa. In the fourth layer, up to 150 mkm thick, the microhardness gradually decreases from 2300 MPa to the microhardness of the base. At the same time, the total thickness of the coatings is up to 200 mkm.

Symbiosis Promotes Fitness Improvements in the Game of Life

We present a computational simulation of evolving entities that includes symbiosis with shifting levels of selection. Evolution by natural selection shifts from the level of the original entities to the level of the new symbiotic entity. In the simulation, the fitness of an entity is measured by a series of one-on-one competitions in the Immigration Game, a two-player variation of Conway's Game of Life. Mutation, reproduction, and symbiosis are implemented as operations that are external to the Immigration Game. Because these operations are external to the game, we can freely manipulate the operations and observe the effects of the manipulations. The simulation is composed of four layers, each layer building on the previous layer. The first layer implements a simple form of asexual reproduction, the second layer introduces a more sophisticated form of asexual reproduction, the third layer adds sexual reproduction, and the fourth layer adds symbiosis. The experiments show that a small amount of symbiosis, added to the other layers, significantly increases the fitness of the population. We suggest that the model may provide new insights into symbiosis in biological and cultural evolution.

HYDROGEOPHYSICAL INVESTIGATION USING ELECTRICAL RESISTIVITY METHOD IN TANKE ILORIN, KWARA STATE

Geophysical investigation using electrical sounding technique was carried out in Tanke community Ilorin, in order to characterize or explore ground water potential. The top soil resistivity values vary from 68.1Ωm to 65.1Ωm and thickness varying between 1.7m to 9.9m. The second layer resistivity values varies from 32.9Ωm to 651.1Ωm and the thickness vary from 2.9m to 12.7m.The third layer is the weathered basement with resistivity and thickness values varying between 22.6Ωm to 9562.6Ωm and 7.8m to 51.1m.The fourth layer is the partly weathered and fractured basement with resistivity and thickness values varying between 101Ωm to 2100Ωm and 80.1m to 124m while the fifth layer is apparently fresh basement whose resistivity values vary from 154.9Ωm to 7130Ωm with an infinite depth. The study further reveal VES 3, 4, and 5 as productive fractures within the weathered basement while other VES points are not productive.

Procesul de evoluare a regosolului pe suprafața haldei de steril în cariera de calcar lafarge ciment (Moldova) s.a. din Rezina

Soil profiles made on the platform with recent deposits under multiannual plants and under trees have shown that they represent regosols (in fact, conventional, because they were recently deposited and flattened (a. 2017) and are composed of fossil soils and unconsolidated rocks) luto-clay with ocher horizont. Layer I (0-2 cm) - the litter is well pronounced, dark brown, resinous, clay-clay, dusty, the structure of the fossil soil was preserved, on the basis of which it formed, loosened, porous, the passage between the underlying clear horizon after compactness. Layer II (2-10 cm) - represents recent deposits, formed on the basis of the fossil soil, reavane, luto-clay, prismatic structure slightly pronounced, more compact than the overlying layer. Layer III (10-38 cm) - recent deposits, formed on the basis of the fossil soil, differs from the overlying layer with a high degree of settling. The fourth layer (38-60 cm) - recent deposits, formed on the basis of the fossil soil, differs from the overlying layer with a high degree of settling. The humus content in the beds under multi-annual plants and under the trees indicated that the humus content in the litter under the perennial plants is 5 times higher than in the litter under the trees, which is explained by the amount of high organic matter which is generated by species of perennial plants rather than trees, which ensures the generation of higher humus content (organic matter).

A Study on the Cause of Layered Seawater Intrusion in the Daqing River Estuary of Liaodong Bay, China

Groundwater over-pumping in estuary cities leads to a series of groundwater environmental problems that seriously restricts economic development. On the basis of field investigation and long-term monitoring data analysis, a three-dimensional numerical model was built in the estuary of the Daqing River in Liaodong Bay, China. The Quaternary overburden can be generalized into five layers according to particle composition and parameters in the vertical direction. There are many scattered irrigation wells pumping in the second layer, and three water source areas mainly pumping groundwater in the fourth layer. Long-term over-pumping in multi-layered aquifers causes onshore layered seawater intrusion. The laws of layered intrusion under the layered pumping were calculated and analyzed with SEAWAT-2000, and the sensitivity was analyzed with the Sobol method. Results showed that the intrusion area had an obvious layered law. Layered pumping directly affected the layered intrusion area, as different permeability, tide and barrage further affected it. The prediction study showed that the cone of depression recovered after the pumping-limit of water source areas, and the intrusion area started to retreat in the fourth layer. At that time, the pumping quantity of irrigation wells became the main reason for the increase of the intrusion area. If the water source areas are used to bear part of the irrigation demand, so as to reduce the pressure of pumping in the second layer, the overall intrusion area can be reduced by about 0.23 km2 under the same pumping quantity.

ANALISA INTERPRETASI POLA ALIRAN AIR BAWAH TANAH KELURAHAN LABUH BARU BARAT KECAMATAN PAYUNG SEKAKI PEKANBARU MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER

Underground water is one of the important component sources for human being. Study on interpretation of underground water flow has been carried out using Geoelectric Schlumberger Electrode Configuration in Labuh Baru Barat Village, Payung Sekaki District, Pekanbaru. The range measurement was chosen to be 240 meter. The output of measurement arecurrent and voltage. The data, then was inputed into software progress and surfer 11. The output of this computer program is a map of underground waterflow pettern and underground lithology. The results of mapping of the pattern of underground water flow indicate that the direction of water flow from North to South direction, or from Pinang street to Payung Sekaki street. The thickness of the layer start from the first layer that is 4.05 meters and 5.4 meters is a layer of silt- clay, the second layer is 13.07 meters and 14.3 meters is a layer of mud stone, the third layer is 13.07 meters and 15.2 meters is a layer of sand and alluvial and the fourth layer is 51.1 meters and 79.2 meters is layer of gravel sand.

STUDI PENYELIDIKAN AIR TANAH DI KOTA TERPADU MANDIRI, PESISIR SELATAN DENGAN METODE GEOLISTRIK

<p><em>Water is a needed for human life, especially in Kota Terpadu Mandiri, Pesisir Selatan. This study aims to determine the type, arrangement of layers of subsurface rocks and their thickness and determine the type of water carrier layer (aquifer) and determine the exact location of drilling water depth in accordance with the hydrological conditions. By conducting an investigation at five measurement points using the Schlumberger geolistrik method with a stretch of 200 m. From the interpretation of the data obtained there are 4 layers of soil in the area of investigation,: the first layer is a layer of cover soil that thickness of 0.60-1.90 meters, the second layer is a layer of sand clay which 4.5-45.00 meters thick, the third layer is a layer of clay that thick 11.80-40.80 meters, and the fourth layer is a layer of sandstone cliffs of 3.00 meters thick to infinity. Based on the estimation of geoelectric data analysis which has the potential to drill groundwater at K-1 point with depth of 130 meters.</em></p><p><em> </em></p><p><em> </em></p><p><em>Air merupakan kebutuahan yang sangat mendasar bagi kehidupan manusia, khususnya di Kota Terpadu Mandiri, Pesisir Selatan. Penelitian ini bertujuan untuk Mengetahui jenis, susunan lapisan batuan bawah permukaan dan ketebalannya serta menentukan jenis lapisan batuan pembawa air (akuifer) dan menentukan lokasi kedalaman pemboran air yang tepat sesuai dengan kondisi hidrologinya. Dengan melakukan penyelidikan di 5 titik pengukuran dengan menggunakan metode geolistrik konfigurasi Schlumberger dengan bentangan 200 m. Dari interpretasi data yang diperoleh</em><em><em> terdapat 4 lapisan tanah di daerah penyelidikan yaitu : lapisan pertama merupakan lapisan tanah penutup yang tebalnya 0,60-1,90 meter, lapisan kedua merupakan lapisan lempung pasiran yang tebalnya 4,5-45,00 meter, lapisan ketiga merupakan lapisan lempung yang tebalnya 11,80-40,80 meter, dan lapisan keempat merupakan lapisan batupasir lempungan yang tebalnya 3,00 meter sampai tak terhingga. Berdasarkan pendugaan analisis data geolistrik yang berpotensi untuk dilakukan pengeboran air tanah di titik K-1 dengan kedalaman 130 meter.</em></em><br /><em></em></p>