Reconstruction of Nineteenth-Century Channel Patterns of Polish Carpathians Rivers from the Galicia and Bucovina Map (1861–1864)

Historical maps are often the only source of information allowing for the regional reconstructions of river channel patterns in the past. In the Polish Carpathians, analyses of historical channel patterns were performed mostly in river reaches scale. In this paper, the Galicia and Bucovina map (1861–1864) (the Second military survey of the Habsburg Empire) was used to reconstruct and map the historical channel patterns of seven rivers from the Polish Carpathians. It was found that, in the nineteenth century, rivers in the western part of the study area (Soła, Skawa, Raba, Dunajec) supported a multi-thread channel pattern, whereas rivers in the eastern part (Wisłoka, San, Wisłok) present a mostly single-thread channel pattern. These differences probably result from the higher relief energy and precipitation, lower proportions of forests in the catchments, and more frequent floods favouring high sediment supply to the fluvial system, and thus the formation of multi-thread reaches in the western part of the study area. At the local scale, the most important factor supporting multi-thread channel pattern development was the availability of gravel sediments in the wide valley floor sections. The formation of anabranching reaches with a single mid-channel form was probably associated with the channel avulsion process. There is no clear evidence linking the change in the channel pattern type with an abrupt change in the river channel slope. This study confirms the usefulness of the second military survey map of the Habsburg Empire for the regional reconstruction of river channel pattern types.

Study of the geometry of open channels in a layer-bed-type microfluidic immobilized enzyme reactor

This paper aims at studying open channel geometries in a layer-bed-type immobilized enzyme reactor with computer-aided simulations. The main properties of these reactors are their simple channel pattern, simple immobilization procedure, regenerability, and disposability; all these features make these devices one of the simplest yet efficient enzymatic microreactors. The high surface-to-volume ratio of the reactor was achieved using narrow (25–75 μm wide) channels. The simulation demonstrated that curves support the mixing of solutions in the channel even in strong laminar flow conditions; thus, it is worth including several curves in the channel system. In the three different designs of microreactor proposed, the lengths of the channels were identical, but in two reactors, the liquid flow was split to 8 or 32 parallel streams at the inlet of the reactor. Despite their overall higher volumetric flow rate, the split-flow structures are advantageous due to the increased contact time. Saliva samples were used to test the efficiencies of the digestions in the microreactors. Graphical abstract

Linking rivers to the rock record: Channel patterns and paleocurrent circular variance

Alluvial rivers are the most important agents of sediment transport in continental basins, whose fluvial deposits enclose information related to the time when rivers were active. In order to extract the most information from fluvial deposits in the sedimentary record, it is imperative to quantify the natural variability of channel patterns at the global scale, explore what controls may influence their development, and investigate whether channel pattern information is preserved in the alluvial plains in order to develop tools for recognizing them in the sedimentary record. By surveying 361 reaches of modern alluvial rivers with available water discharge data at a global scale, we present a quantitative channel pattern classification based on sinuosity and channel count index applicable to the recognition in the rock record. A continuum of channel patterns ranging from high-sinuosity single channel to lowsinuosity multichannels is documented, along with the proportion of depositional elements in their alluvial plains and their conditions of occurrence. Preserved barforms in the alluvial plains of these rivers are used to infer and quantify paleoflow directions at the channel-belt scale and result in ranges of paleocurrent circular variance that may lead to channel pattern identification in the rock record. Data from this work indicate that the recognition of channel patterns may be used to predict paleogeographic features such as the scale of drainage basin area and discharge, slope, and annual discharge regimes.

Analysis Of Egg Marketing On Chicken Farming Partnership Pattern in Lamonggedo Jaya Farmer Group Baruga District Of Kendari City

The research aims to analyze the marketing of eggs in the chicken farming business partnership pattern in the group of farmers Lamonggedo Jaya, Baruga District, Kendari City in December 2020. The object of the study was laying hens as well as all aspects related to egg marketing and determined purposively. Variables in the research in the form of characteristics of respondents, marketing agencies, marketing channels, marketing margins, costs and profits of each marketing institution are analyzed qualitatively and quantitatively. The results of the analysis showed there are four patterns of egg marketing channels, among others, (1) Breeder  company  great traders  retailer merchants  end consumer, (2) Breeder  company  great traders  retailer merchants  end consumer, (3) Breeder  company  retailer merchants  end consumer, (4) Breeder  company  end consumer. The highest margin on the 1st marketing channel pattern is Rp. 17,500/shelf, the 4th lowest marketing channel is Rp. 4,000/shelf and the marketing channel in the highest expenditure is the 4th marketing channel Rp. 5,318/shelf. The marketing channel that has the highest profit is the 1st marketing channel Rp. 12.182/shelf. The most efficient marketing channel used by end consumers is the 4th marketing channel because of its lowest marketing margin value.

Revenue And Marketing Channel Of Oyster Mushroom In Probolinggo District

This research is a quantitative research. Primary data is the result of filling out questionnaires by all respondents, namely all mushroom farmers in Probolinggo. And secondary data in the form of all mushroom farmer data in Probolinggo with a total population of 60 mushroom farmers in Probolinggo. The selection of oyster mushroom farmer respondents was carried out using the census method. The samples in this study were all farmers who cultivated oyster mushrooms in Probolinggo Regency. The results of this study indicate that oyster mushroom farmers in Probolinggo use logs. By using this tool, it can increase the income of mushroom farmers. So that the oyster mushroom in Probolinggo is suitable to be used as a business / developed field. The marketing channel pattern of oyster mushrooms in Probolinggo uses two patterns. Namely the first pattern, mushroom farmers sell mushrooms to resellers, resellers will resell to retailers and retailers will sell again to end consumers. For the second pattern, mushroom farmers sell resellers, and resellers will sell directly to the final consumer. From the above analysis it can be concluded that the second channel is more profitable for farmers in terms of income.

Marketing Channels Efficiency Analysis of Scad (Decapterus sp.) Catches of Traditional Fishermen in Pengambengan Village Jembrana, Bali

Efficient marketing is characterized by low marketing margins and high farmer's share. This research was conducted to determine the condition and level of efficiency marketing channels Scad in Pengambengan Village during February-March 2020. The method used was descriptive qualitative method and quantitative descriptive by observation and interviews. Interviews were conducted with fishermen, collectors, wholesalers and retailers. The Marketing margin analysis and farmer's share were used to determine level of efficiency marketing channel. The results of the analysis show that there were two patterns of marketing channels for Scadthat were caught by traditional fishermen in Pengambengan Village. Marketing channel pattern I was a two-level channel pattern, while marketing channel pattern II was a three-level channel pattern. The marketing margin value in the two-level channel pattern was Rp5.700/kg with a farmer's share of 71%. The marketing margin value in the three-level channel pattern was Rp9.700/kg with a farmer's share of 59%. The marketing efficiency value obtained in two-level marketing channel pattern was 6%, while in three-level channel marketing pattern the marketing efficiency value was 8%. Based on the values obtained, the marketing efficiency of two-level channel pattern was as efficient as the three-level channel pattern. Thus, the marketing of Scad that were caught by traditional fishermen in Pengambengan Village was classified as efficient marketing.