bluuebunny/crossref_metadata_2025 huggingface dataset:
The Diversity and Classification of Tea Germplasm Based on Morpho-Agronomic Characteristics
Authors: Wibowo N A , Martono B
Published: February 2022

The information on diversity needs to be disclosed as a basis for consideration in the use of genetic resources. The objective of this study is to reveal the diversity and the classification of tea germplasm based on morpho-agronomic characteristics. The experiment was carried out from June to December 2018 in Gunung Putri Experimental Garden, Cianjur, West Java, Indonesia. The materials of the study used were 13 first generation tea clones. The research used was the observation method.s. The level of kinship among the clones was calculated using cluster analysis with the PBSTAT program. The results of observations showed that there was a diversity of leaf margin characteristics, leaf shape, mature leaf color, and immature leaf color. The high diversity was seen in pecco+2 weight, pecco+3 weight, and petiole length. The highest weight of pecco+3 was found in clone Cin 1. The coefficient of dissimilarity of 0.34 was divided into 2 main groups. Group I consisted of the clone Cin 1 and the clone Cin 28. The second group consisted of 11 tea clones. The clone Cin 1 and the clone Cin 28 and the clone Mal 17 are the tea clones with the smallest similarity values.
Molecular Identification of Potential Rhizobacteria Isolated from Maize (Zea mays L.)
Authors: Ikhwan A , Septia E D , Novita B A
Published: February 2022

Maize (Zea mays L.) is one of the highly demanding food plants in Indonesia but the production is currently not sufficient to meet the community's needs, so that efforts to import maize in Indonesia are still frequently carried out. Meanwhile, the maize production who mostly produced by local farmer mainly cultivated on marginal land which is threatened by drought stress. Efforts should be make to increase maize productivity on dry land by utilization of rhizobacteria isolated from maize rhizosphere. This study aimed to determine the types of rhizobacteria from the diversity of microbes that potentially increase the productivity of maize plants. This study used 2 isolation methods, namely isolation on gram-positive and gram-negative, followed by electrophoresis and PCR with primers of 27F and 1492R. Then the PCR results were sequenced and analyzed using Mega X. The sequencing results compared with Genbank at NCBI showed 10 isolates that have been shown to have closeness to several strains of bacteria, such as Raoultella terrigena, Serratia marcescens, Serratia nematodiphila, Enterobacter hormaechei, Enterobacter cancerogenous, Enterobacter cloacae, Enterobacter asburiae, Citrobacter murliniae, Pseudomonas fluorescens. depicted in phylogenetic analysis. Based on the phylogenetic analysis, the L5S2 10-7 isolate has similarities with the Enterobacter asburiae strain, while the L2S1 10-6 isolate is closely related to the Enterobacter cancergenous strain, Then the Citrobacter murliniae strains were closely related to L5S5 10-8 and L1S3 10-7 isolates. In addition, the Enterobacter hormaechei strain also has a close relationship with isolate L3S1 10-8, and the Raoultella terrigena strain has a close relationship with isolate L5S2 10-6. The L1S5 10-6 and L3S5 10-7 isolates had the same similarity based on genetic characters but had different abilities in helping the performance of plants belonging to the rhizobacteria group.
Microclimate Dynamics In Sweet Corn Intercropping with Various Legumes
Authors: Setiawan A N
Published: February 2022

Sweet corn is generally grown in monoculture with wide spacing because it is easier to do but less effective and efficient in using resources, which cause the microclimate around sweet corn to be not optimal for its growth. Intercropping can improve the microclimate due to the presence of intercrops between the sweet corn. The type of intercrops affect the microclimate around sweet corn. This research aims to determine the effect of various legumes on the abiotic environment and find the legumes that can create an optimal abiotic environment for sweet corn. This research was conducted in 2019 using a single factor experimental method that arranged in a complete randomized block design with three blocks as replications. The treatments were legumes consisting of peanuts, soybeans, cowpeas, red beans, and mung beans. In addition, sweet corn is also planted in monoculture as a control. The research results showed that legumes among sweet corn could decrease daylight intensity above soil level with the most significant light extinction coefficient on the intercropping of sweet corn with soybeans, but has no significant effect on soil temperature and humidity. Soybeans and cowpeas are more suitable as intercrops on sweet corn intercropping to improve the environment.
The Effect of Natural PGR Combination on The Growth of Fig (Ficus carica L.) Plant Cuttings
Authors: Dewi S S , Sabhara S A
Published: February 2022

Fig is shrub with short stems, creeping, not many trunks and woody which have cambium tissue due to thickening between the xylem and phloem, can grow and bear fruit in the hot sun or in the desert. Fig plant is a plant that has many benefits. The purpose of this research is to determine the effect of natural Plant Growth Regulator (PGR) (mature coconut water, young coconut water and shallot extract) and obtain the best concentration of PGR for Fig plant cuttings. The study was carried out by field trial methods arranged in Completely Randomized Design (CRD) with a single factor trial design. The treatments tested were the addition of PGR from natural ingredients, namely: mature coconut water 20% and 30%, young coconut water 20% and 30%, red shallot extract 60% and 70% and commercial PGR (Root-Up™™). Each treatment was repeated 3 times. The results of this search showed that all-natural PGR tested, namely from young coconut water concentrations of 20% and 30%, mature coconut concentrations of 20% and 30% and shallots concentrations of 60% and 70% can be used to increase the growth of Fig plant cuttings. All natural PGRs tested, namely young coconut water with a concentration of 20% and 30%, mature coconut with a concentration of 20% and 30% and shallots with a concentration of 60% and 70% can be used to increase the growth of fig plant cuttings.
Effect of nano-formulated indigenous Rhizobium sp. on nodulation, growth, and yield of Edamame soybean
Authors: Astuti A , Matara V V
Published: February 2022

The isolates of indigenousRhizobiumsp. are compatible with Edamame soybean, but the inoculum formulation using a carrier material from ordinary peat has not been optimal. The study was aimed to evaluate the effects of the nano-formulation of indigenousRhizobiumsp. inoculum on the growth and yield of Edamame soybean. The research was arranged in a randomized complete block design using a single factor treatment, namely the inoculum formulae, consisting of Nano Peat 95% + Nano Biochar 5%, Nano Peat 95% + Nano Bone 5%, Nano Peat 90% + Nano Biochar 5% + Nano Bone 5%, and Peat 50% + Charcoal 49% + Lime 1% (control). Each treatment consisted of three replications, producing 12 experimental units. Observations were made on the population dynamics of indigenousRhizobiumsp., nodulation, growth, and yield of Edamame soybean. The inoculation of nano-formulated indigenousRhizobiumsp. was significantly effective in nodulation, accelerating flowering period, and increasing the yield. The treatment of Nano Peat 90% + Nano Biochar 5% + Nano Bone 5% produced the highest yield (10.28 tons/ha), indicating an increase of 2.3% compared to the control
Physio-morphological of Soybean in Monoculture and Intercopping with Corn
Authors: Sepasthika T , Setiawan A N
Published: February 2022

Soybean is the main food crop in Indonesia after rice and corn. Soybean is a raw material for several foods which are a good source of fiber for the human body. Soybean productivity in Indonesia is still low at 15.24 Ku/Ha because farmers are still using a monoculture cropping system, which causes plant physiological processes to be not optimal so that growth and yields are low. One of the efforts to increase soybean growth and yield is by the intercropping system. The potential crop for intercropping with soybeans is corn because it has different physiological and morphological characteristics. This study explained the physiological aspects of plant height and number of leaves, leaf area, plant dry weight, and yield. The treatment tested were monoculture soybean and soybean intercropping with various proportions of corn population. The result showed that soybean and corn intercropping produced higher physio-morphology than monoculture soybeans.
Carrying Capacity for Land Rehabilitation Strategy in Merawu Watershed, Banjarnegara District
Authors: Marcella P , Suryatmojo H , Faida L R W
Published: February 2022

The upstream watershed area (DAS) has a function as a buffer zone. The Merawu watershed is one of the upstream parts of the Serayu watershed which is dominated by agricultural land. The declining carrying capacity of the Merawu watershed is indicated by the imbalance between supply and demand for resources in the Merawu watershed. For a long time, it can interfere with the function of the soil as life support. The research objectives are: 1) analyzing the carrying capacity of the Merawu watershed through 3 approaches, namely: ecological footprint (land capacity), water capacity, and land protection capacity. The research method used is to compare supply and demand. And 2) Formulating a recovery strategy in the Merawu watershed based on an analysis of the environmental carrying capacity and focusing on increasing the carrying capacity. The results showed that the Merawu watershed has the carrying capacity of the protection function in the overshoot condition, the water carrying capacity in the conditionally-save condition, and the carrying capacity of the land in the overshoot condition. There are five watershed recovery strategies in the upstream, middle and downstream areas to increase carrying capacity.
The Effect of The Application of Soil Biostructures Created Using Biochar and Seaweed Extract on Upland Rice Growth
Authors: Kilowasid L M H , Samiri S , Arma M J , Sabaruddin L , Bahrun A , Afa L , Rakian T C , Hisein W S A
Published: February 2022

Earthworms play an important role in mixing soil particles with biochar grains, as well as creating biostructures, and the application of seaweed extract to soil affects the microbes within, as well as plant growth. This study, therefore, aims to investigate the effect of mixing soil, teak leaf biochar, as well as seaweed extract on the arbuscularmycorrhizal fungal (AMF) spores within the biostructures formed, and analyze the effect of applying these biostructures to planting media soil on the growth and yield of local upland rice. Before the experiment, extract stock from Sargassum sp. was diluted with water into five separate concentration levels, 0%, 20%, 40%, 60%, and 80%. Subsequently, 20 individual earthworms were released on the soil surface previously mixed with biochar and seaweed extract in a reactor. The planting media used in this study was soil from the cogongrass area with grain sizes below 4 mm, and about 10% (w/w) of the biostructures formed were added to the media in a polybag, then the mixture was transplanted with upland rice seedlings of local variety Sorawolia.According to the results, the treatment containing had the highest total AMF spores. Furthermore, the addition of biostructures significantly affected plant height, leaf number as well as area, and the number of tillers at 42, 42 to 70, and 70 days after application, respectively. Meanwhile, the highest plant dry weight and panicle length were obtained from the treatments containing 80% and 60% extract stock, respectively. However, there was no significant difference in the spikelet number and percentage of filled spikelets between the biostructures. Therefore, the application of both teak leaf biochar and extract of Sargassum sp. was concluded to be able to improve the performance of earthworms (Pheretima sp.) in creating soil biostructures containing AMF spores, for local upland rice development in conditions of poor soil fertility. However, future studies are required to investigate this application’s potential as a source of inoculum for AMF spores or other beneficial microbes, for application at the smallholder farm level.
Effect of Different Soil Fertility on Growth and Development of Two Citrus Cultivars Under Two Locations
Authors: Devy N F , Dwiastuti M E , Hardiyanto
Published: February 2022

The response of citrus cultivar on soil fertility under different locations has been known prior to its fertilizer application. The aim of this research was to study the effects of different soil fertility on the growth and development of citrus cultivars under two locations. This research was conducted at Langgam Subdistrict, Pelalawan Regency, Province of Riau, Indonesia from February to June 2020. The three-year-old citrus trees of Siam (Tangerine) cv. Pontianak/SP (C. nobilis) and Keprok (Mandarin) cv. Tejakula/KTJ (C. reticulata Blanco) were used in this study. A statistical comparison (Student’s t-test) was used to compare the growth of two citrus cultivars planted into two locations. The nutrient contents in soil and leaves were determined; the growth parameters and leaf pigments were observed and the correlations were analysed. The results showed that status of soil nutrition in two locations ranged low to medium, with pH of 5.1-6.0. At the first location, SP absorbed elements of Ca, Mg, Fe, Zn and Mn 24.1% higher than KTJ. On the other hand, KTJ could absorb the P, K, Na, S and B elements by 24.4% higher than SP. However, at the second location SP is more adaptive on absorbing the elements of N, Na, Mg, S, Zn and B by 26.9% higher than KTJ, while this cultivar could absorb only 10.3% higher of K and Mn. Status value of chlorophyl a and b of citrus cultivar grown in location I was higher. A positive linear relationship has been found between all growth variables with C organic, EC, CEC, Fe, P2O5, K, Ca, pH, and SO4 of soil. The same relation has been found with increasing trunk cross-sectional area (TCA) for growth of plant height and canopy of both cultivars. In general, the growth and development of Siam Pontianak was better than Mandarin Tejakula. The status of soil nutrition and the initial growth performance of each cultivar can be used as a guideline for the application of balanced fertilizers to produce plants that grow optimally.
Location Determination of Critical Land Indicative as Basis for Forest and Land Rehabilitation in Merawu Watershed, Banjarnegara District
Authors: Ginting F B , Suryatmojo H , Widiyatno
Published: February 2022

Some of the socio-economic benefits provided by the watershed are providing timber and non-timber forest products for the society, as a provider of water needs, as a provider of agricultural land, and others. However, due to intensive management and not implementing the principle of sustainability. Currently, the Merawu watershed is experiencing damage in terms of the criticality of the land. This research is categorized as renewable research related to the determination of critical land. Because, this study used data based on land problems. After combining the map of land susceptibility and map of critical land, an indicative map of critical land is obtained which shows the location with criticality factors. The Critical Land Indicative (CLI) location is indicated by its factors, namely the CLI for the erosion factor has an area of 734,56 ha, the CLI for the critical land factor has an area of 32,73 ha, the CLI for the slope factor has an area of 5.333,64 ha, the CLI for the critical land and erosion factors has an area of 2.247,78 ha, CLI of slope and erosion factors has an area of 4.114,30 ha, CLI of slope and critical land factors has an area of 18,17 ha, CLI of slope and shallow soil factors has an area of 175,87 ha, CLI of slope, critical land, and erosion factors has an area of 9.277,03 ha, CLI for slope, shallow soil, and erosion factors has an area of 558,84 ha, CLI for slope, shallow soil, and critical land factor has an area of 12,76 ha, and CLI for slope, shallow soil, critical land, and erosion factor has an area of 61,35 ha. The existence of an indicative map of this critical land can be used as a basis for consideration in planning forest and land rehabilitation activities.
Landslide Vulnerability Analysis with The Application of Geographic Information System (GIS) and Remote Sensing in Purworejo Regency
Authors: Mahendra D , Aini L N
Published: February 2022

Purworejo as areas that had the potential for landslides because of high rainfall as well as a portion of its territory lies in the slopes.In addition the residency in Purworejo always increase every year with less public awareness of the existence of a potential landslide disaster in was territory and the territories of Purworejo Setup that was still not good. A research purpose to mapping the region prone to disastrous landslides in Purworejo. The method used was the method the survey analyzed in spatial and descriptive. Method of determination of location based on factors of soil texture, soil, slope of the solum depth slopes, rock types, soil permeability, rainfall and land use. Each type of map that needed done classification based on score and given more weight then overlay. The results of this research in Purworejo had three classes of landslide insecurity that is contained in a map, class insecurity landslide lower with a total area of 1,325 hectares, class insecurity landslides were with the area of 66,414 hectares and class insecurity landslide with high extents of 39,293 hectares. As for efforts to prevent the occurrence of landslides are divided based on class insecurity landslide.
Antihyperglycemic and Hypolipidemic Potential of Kepok Banana Peel in Diabetic Rats
Authors: Indriawati R , Atiyah FU
Published: February 2022

The prevalence of Diabetes Mellitus (DM) is still high. DM can cause changes in lipid profiles such as hypercholesterolemia, hypertriglyceridemia, and increased LDL levels. This study aimed to test the ability of kapok banana peel extract in reducing glucose, triglyceride, and LDL cholesterol levels in streptozotocine-induced Rattus norvegicus. This type of research is an experimental design with pre and post-test control design. Twenty-five male subjects were Rattus norvegicus. Data were analyzed by the Wilcoxon test, Kruskal Wallis test, and Mann Whitney test. The length of the study was 21 days. The results of the analysis of the use of banana peel extract can reduce levels of glucose, triglycerides, and LDL cholesterol (p= 0.025, p = 0.043, p=0.043). Kepok banana peel extract has the potential as antihyperglycemic and antilipidemic in diabetic rats.
The Potential of Chili Varieties as Powder Raw Material
Authors: Musaddad D , Kirana R , Sa’adah I R , Harmanto  , Thamrin M , Waryat  , Ratule M T
Published: February 2022

Selection Chili powder is one of chili product diversification form that can be a solution to solve the problems when chili production is abundant. This study aimed to test the potential of The Indonesian Agency for Agricultural Research and Development (IAARD’s) chili varieties as chili powder raw material. The research was conducted at IVEGRI from September to December 2020. A completely randomized design was applied with 10 treatments and 3 replications. The treatments consisted of 10 registered IAARD’s varieties. The results showed that there were two main components that influenced the diversity between tested varieties, the first main component (powder yield, moisture content, spiciness level, fruit diameter, thickness of fruit skin and weight per fruit) were 62.7% and the second main component (levels of vitamin C and fruit length) were 15.7%. The chili varietes that have the best yield of powder and spiciness were Lembang-1, Kencana, and Pancanaka. Meanwhile, Branang had a goodlevels of flour, spiciness, and vitamin C. By considering the parameters that are closely related to chili powder production, the potential varieties as chili powder raw material are Lembang-1, Kencana, Pancanaka and Branang. Further research is still needed to test the potential chili varieties as other processed.
Identification of Fungi in Oil Palm with Dry Frond Disease at PT Bumitama Gunajaya Agro
Authors: Irvanto D , Ardiyanto A , Tamba L M
Published: February 2022

Oil palm is a plantation crop that produces palm oil and palm kernel oil which are Indonesia's main source of foreign exchange from the plantation sector. The practice of monoculture cultivation on oil palm plantations grown on various types of soil in Indonesia, has big challenges in the aspect of cultivation, especially pest and disease control. One of the diseases that cause losses in the cultivation of this commodity is dry frond. This disease has been found in oil palm trees in the plantation of PT Bumitama Gunajaya Agro grown on Quartzpsamments and Haplohemists soils. This pathogen causes the rachis and leaves to dry from the tip to the base of the frond. The spread of this disease is thought to be due to contact between infected to healthy fronds. In this study, 6 isolates were obtain from leaves and 7 isolates from infected rachis. Based on the macroscopic and microscopic characteristics of the isolates, one isolate from Sungai Langir Estate belonged to the genus Thielaviopsis sp. However, the postulate koch test showed that the thirteen isolates could not infect and cause symptoms of dry frond disease on the leaves and rachis of the tested oil palm plants.
Seeds Phenotypes Characterization of Promising Tungro-Resistant Rice Lines
Authors: Muazam A , Praptana R H
Published: February 2022

Breeding activities to produce a new site-specific rice varieties resistant to tungro require of suitable genetic materials as cross-breeding materials. This research aims to determine the seed phenotypic characters of promising tungro resistant rice lines and their similarity. The research was conducted using a completely randomized design with treatment of 42 promising tungro-resistant rice lines, 1 resistant rice variety (Inpari 7) and 1 susceptible rice variety (TN1), that each of which was repeated 3 times. The characters were observed included of quantitative and qualitative characters. Observation of seed characters was carried out based on the standard system of characterization and evaluation of rice plants. The similarity of seed characters was analyzed by using the NTSYS pc version 2.1 program and displayed in the form of a dendrogram. The results showed that most of the tested lines had the same quantitative characters as the Inpari 7 variety. The value of variability of diversity was included in the broad category of >4, with the lowest similarity coefficient of 63% and the highest of 94%. The similarity analysis based on the seed characters resulted in 2 large groups consisting of 41 lines belonging to the Inpari 7 group and 1 line belonging to the TN1 group. The lines that were incorporated in the Inpari 7 group were further divided into two subgroups of 39 and 2 lines, respectively. The results of this research are preliminary data to obtain an information of the relationship between seed characters and tungro resistance properties.
Effectiveness of Cattle Bone Ash Nano Particle as a Source of P to Replace SP 36 Fertilizer in Sweet Corn Cultivation in Entisol soil
Authors: Mulyono  , Putri M N , Hidayat T
Published: February 2022

The aim of the research is to study effectiveness of nano particle of cow bone ash to substitute SP36 synthetic fertilizer on cultivation of maize (Zea mays SaccharataSturt) in entisol soil. The method used in this research was completely randomized block design with single factor of 5 treatments. The treatments were 100% of SP36 & 0% nanoparticle as control, 75 % of SP36 & 25 % of nano particle of cow bone ash, 50 % of SP36 & 50 % of nano particle of cow bone ash, 25 % of SP36 & 75 % of nano particle of cow bone ash. and 0 % of SP36 & 100 % of nano particle of cow bone ash. Parameters used in this study were the growth and yield of sweet corn. The results revealed that application of nano particle of cow bone ash could substitute synthetic fertilizer of SP-36 in the range of 25 to 100 % of growth and yield of maize. The application of treatment 25 % of SP36 & 75 % of nano particle of cow bone ash could increase cob weight of maize about 24 ton per ha or could increase the yield about 35 % compared to 100% SP36.
Improvement The Fertility of Sandy Soil Amended using Bagasse and Different Type of Soil to The Yield of Shallot
Authors: Fibrianty  , Ma’as A , Hanudin E , Sudira P
Published: February 2022

The sandy soil in Samas Beach, Yogyakarta is characterized by the dominance of sand fraction, high leaching of nutrient, and high soil temperature. Shallot cultivation is possible in coastal sandy land through modification of microclimate and improvement of soil fertility. This study aimed to determine the effect of improving physical and chemical fertility of sandy soil amended by clay soil and bagasse to the yield of shallot. The study was conducted using Randomized Block Design with four treatments and four replications: Sandy Soil (S), Sandy soil + Bagasse (SB), Sandy soil + Latosol + Bagasse (SLB), Sandy Soil + Grumusol + Bagasse (SGB). Amendment increased moisture contents and decreased the permeability of sandy soil. SGB improved the highest water holding capacity, organic C and Total N of sandy soil. The highest yield of shallot reached at application of SLB and SGB, these treatments produced total dry weight of shallot, which were 19.63 and 23.85 g clump-1. The combination of clay soil and bagasse was recommended as the amendment technology to improve the fertility of sandy soil.
The Effectiveness of Spraying Nano Bone Ash and Palm Oil Empty Fruit Bunch Ash on Characteristics of Rice in Salibu System Plus Earthworms
Authors: Hariyono  , Nagari A Z P
Published: February 2022

This study aims to determine the effectiveness of spraying nano bone ash and palm oil emty fruit bunch ash on characteristics of rice in salibu system plus earthworms. This research was carried out in the Agricultural Experiment Grenn House of the Muhammadiyah University of Yogyakarta in January to June2021.This study uses a single factor design arranged in a Complete Randomized Design (CRD), there are 4 treatm ents.Each tratments consisted of 6 plant samples with 3 replications namely: P1. Urea 250 kg/ha + SP-36 100 kg/ha + KCl 100 kg/ha + Earthworms, P2.Urea 250 kg/ha + SP-36 50 kg/ha + KCl 100 kg/ha + Nano Bone Ash concentration 0,2 % + Earthworms, P3. Urea 250 kg/ha + SP-36 100 kg/ha + KCl 50 kg/ha + Nano OPEFB concentration 0,3 %, P4.Urea 250 kg/ha + SP-36 50 kg/ha + KCl 50 kg/ha + Nano Bone Ash concentration 0,2 % and Nano OPEFB concentration 0,3 % + Earthworms. Plant of material obtained from previous rice planting. The results showed that the spraying particle of nano bone ash and palm oil empty fruit bunch ash in salibu system plus eart worms effect on the diversity of qualitative character :color leaf sheath (pale green; green and dark green), leaf blade (pale green and green) and colorof stem (yellowish green and green) and on the diversity of quantitative character : height of plant, number of tillers, number of productive tillers, weight of grainst per clump.
Identifying factors which induce transitive processes in blasthole drilling in structurally complex rock masses
Authors: Regotunov AS , Sukhov RI , Grashchenko DA
Published: February 2022

A new methodological approach is proposed to identify the effect of changing conditions on the performance of drilling operations in open pit mining. Drilling is presented as a subsystem of the more general system called a “mine”, the stability of which is affected by multiple factors. This paper describes the first stage of implementing the proposed methodological approach to identify the blasthole drilling factors that govern the transitive processes as necessary reactions of the “drilling operations” subsystem when adapting to the changing operating conditions. The revealed main factors which affect the “drilling operations” subsystem stability at the level of blasthole drilling at the pilot site of a mine are presented.
Analysis of the Application of Reagent Combination in the Flotation of Non-sulfide Ore
Authors: Semyanova DV
Published: February 2022

A brief review of articles on the flotation of minerals using a combination of reagents is presented. It is noted that the main attention of the authors is aimed at studying the effect of the combination of collectors at the mineral-liquid interface. It was shown that one of the reagents or associates formed as a result of their joint action, possessing surface activity, can serve as a desorbed form of sorption and help reduce the induction time during the formation of a flotation complex.
Efficient use of process water in open pit mining of watercut lignite fields in the Kansk–Achinsk Basin
Authors: Reznik AV
Published: February 2022

The review of the use of process water in open pit mines and Russia and abroad helps find out that the conventional drainage technologies are inefficient for watercut lignite fields in the Kansk– Achinsk Basin. The author proposes a mining technology without preliminary drainage of watercut lignite seams, which ensures reduction in unproductive expenditures connected with coal mining and mitigation of the environmental impact.
An approach to differentiation and evaluation of mineral resource potential in coal mining
Authors: Gavrilov VL , Freidina EV
Published: February 2022

A mining company is a complex probabilistic system which functions in-between the geological and market environments. These environments are the carriers of various uncertainties which have influence on the business success. The authors discuss the background of differentiation of the mineral resource potential in terms of a coal field as transformation of a natural possibility to the manmade reality. It is distinguished between the limit, achievable and investment potentials. This type design takes into account the stages of geological exploration, study of coal properties and actual mining of the subsoil use object. The static, ergodic and non-ergodic categories of uncertainty are discussed.
Self-braking harmonic drives in mechanisms of mining machines
Authors: Baris AV
Published: February 2022

The conditions of self-braking in harmonic drives with a flexible wheel made in the form of a bushing chain are considered. A special feature of the harmonic drive is the design that has a dual generator and a double-crowned sprocket. This design allows to avoid skewing the chain under load. The criteria for self-braking in chain harmonic drives are defined. It is found that for chain harmonic drives in the range of gear ratios above 30, the effect of self-braking is provided. In the range of gear ratios up to 30, extra-centroid gearing is required to achieve the effect of self-braking.
Digital Field concept toward enhanced efficiency of coal mines
Authors: Khoyutanov EA , Nemova NA , Abeuov EA , Abdieva LM
Published: February 2022

Increasingly high uncertainty, complexity and variability of the mineral mining sector performance necessitates integration of digital technologies to improve business. Coal mines use DT much more less than the oil and gas industry. It seems a promising way to make use of the experience gained in the oil and gas industry to advance the Digital Field concept and Industry 4.0 as a basis for the sustainable tactical and strategic operation of business in coal mining. Digitalization of mineral resources and mineral reserves, geotechnologies and control provides a real-time picture of production and marketing. Furthermore, efficiency of coal exploration, mining, dressing and consumption is increased. It is expedient to use 3D modeling in evaluation of coal reserves, qualities and occurrence conditions to adapt mines to better and rival scenarios of development of structurally complex coal fields.
Lever-type percussive mechanisms developed by S. Abdraimov for soil compacting
Authors: Abdraimov ES , Bakirov BB , Shadiev MI
Published: February 2022

The designs of lever-type percussive mechanisms with the largest piston-rod developed by S. Abdraimov for soil compacting are considered. The results of kinematics research of three different diagrams including the largest base drawn by S. Abdraimov are presented. Basic parameters of these diagrams are determined and recommended to create high-frequency percussive mechanisms for soil compacting.
DEM simulations of dynamic impact on a rock mass complicated with a cavity and a tectonic disturbance
Authors: Khan GN , Rusin EP
Published: February 2022

The effect of a blast on a rock mass complicated with a cavity and a tectonic disturbance is considered. The disturbance is an extended broken rock layer located in the vicinity of the cavity. It is shown that the layer reduces the effectiveness of dynamic action on the cavity. The dependence of stability of the cavity exposed to the shock wave on the thickness of the layer and on the strength properties of the rock mass is revealed.
On the possibility of increasing the range of movement of rocks with the help of vibration transport
Authors: Kulikova EG , Usoltsev VM
Published: February 2022

The results of the experimental studies of the dynamics of the elastic working body of a vibratory conveying device equipped with two inertial vibration exciters are presented. The nature of the change in the mismatch of vibration source rotary frequencies and the degree of their mutual influence with an increase in the linear weight of bulk material has been established. The basic relationships of the structural and dynamic parameters of the vibrating device have been determined, which make it possible to increase the movement range of loose geomaterials.
Prediction of residual stress field on the surface of quenched 7055 aluminium alloy plates
Authors: Ren Weicai , Li Yanan , Zhang Yongan , Tong Youzhi , Li Xiwu , Li Zhihui , Xiong Baiqing
Published: February 2022

The effect of width on the surface quenching residual stress distribution in 7055 aluminium alloy plates of different width values was studied. The distribution of quenching residual stresses of the plates were studied by both simulation and experiment. Numerical simulation was carried out by using the Finite Element Method (FEM), and experimental measurements were conducted to verify the simulation work. The results show that the experimental distributions are approximately consistent with the simulation distribution. The stress fluctuations exist in the edge of the plate and the ratio of the fluctuation region decreases as the width increases. Considering the consistency of the centre point stress and actual length of the fluctuation region, we proposed a method to predict the surface residual stresses distribution using two-step data processing, providing a more convenient method for predicting the stress distribution of the plate with a large dimension by the plate with a small width.
Quantum battery based on quantum discord at room temperature
Authors: Cruz Clebson , Anka Maron F , Reis Mario S , Bachelard Romain , Santos Alan C
Published: February 2022

The study of advanced quantum devices for energy storage has attracted the attention of the scientific community in the past few years. Although several theoretical progresses have been achieved recently, experimental proposals of platforms operating as quantum batteries under ambient conditions are still lacking. In this context, this work presents a feasible realization of a quantum battery in a carboxylate-based metal complex, which can store a finite amount of extractable work under the form of quantum discord at room temperature, and recharge by thermalization with a reservoir. Moreover, the stored work can be evaluated through non-destructive measurements of the compound’s magnetic susceptibility. These results pave the way for the development of enhanced energy storage platforms through material engineering.
Classification of surface roughness during turning of forged EN8 steel using vibration signal processing and support vector machine
Authors: Guleria Vikrant , Kumar Vivek , Singh Pradeep K
Published: February 2022

The prediction of surface finish during machining is critical for determining the requirement of change in machining conditions. The present work methodology identifies different classes of surface finish during machining i.e., good, satisfactory, or poor. To identify the surface quality, the time-domain, frequency-domain, and fast fourier transform (FFT) image features of vibration data during machining were used. These features have been fed to the Bayesian optimized Support Vector Machine (SVM) model and compared. The comparison criteria considered are confusion matrix, Receiver Operator Characteristic (ROC) curve and accuracy. The model with FFT image features and cutting parameters as input provides 84.84% accurate classification. However, 91.90% accuracy has been observed using the model with frequency-domain features included with cutting parameters. The variation of cutting parameters concerning the response variable has been verified using Taguchi analysis and found satisfactory. The prediction of different classes of surface roughness based on vibration data will help in the automation of quality systems to accept or reject the product.
Spray rate effects on the NO2gas sensor properties of Ni-doped SnO2nanoflakes
Authors: Abduljabbar Qutaiba A , Radwan H A , Marei Jassim M , Rzaij Jamal M
Published: February 2022

Nickel-doped Tin dioxide (NSO) nanostructured thin films were deposited using chemical spray pyrolysis at 450 °C at various spray rates. The structural, morphological, and optical properties of the prepared nanostructured thin films were investigated to determine the effect of these parameters on the sensing properties of NSO film. X-ray diffraction revealed a polycrystalline structure with an increasing crystallite size as the deposition rate increased, which resulted in a gradual decrease in the bandgap. The FE-SEM images demonstrate that the deposition rate significantly influences the surface morphology and gas sensitivity performance. The sensitivity of the NO2gas sensor fabricated employing NSO thin films increased as the deposition rate, and NO2concentration was increased. At an optimal sensing temperature of 373 K, the maximum sensitivity was 120%, with a response and recovery time of 17 and 19 s, respectively.
Vision for a European metrology network for energy gases
Authors: Murugan Arul , Omoniyi Oluwafemi , Richardson Emma , Workamp Marcel , Baldan Annarita
Published: February 2022

As Europe moves towards decarbonising its energy infrastructure, new measurement needs will arise that require collaborative efforts between European National Metrology Institutes and Designated Institutes to tackle. Such measurement needs include flow metering of hydrogen or hydrogen enriched natural gas in the gas grid for billing, quality assurance of hydrogen at refuelling stations and equations of state for carbon dioxide in carbon capture and storage facilities. The European metrology network for energy gases for the first time provides a platform where metrology institutes can work together to develop a harmonised strategy, prioritise new challenges, and share expertise and capabilities to support the European energy gas industry to meet stringent EU targets for climate change and emissions reductions.
Modeling the cardiac electromechanical function: A mathematical journey
Authors: Quarteroni Alfio , Dedè Luca , Regazzoni Francesco
Published: February 2022

In this paper we introduce the electromechanical mathematical model of the human heart. After deriving it from physical first principles, we discuss its mathematical properties and the way numerical methods can be set up to obtain numerical approximations of the (otherwise unachievable) mathematical solutions. The major challenges that we need to face—e.g., possible lack of initial and boundary data, the trade off between increasing the accuracy of the numerical model and its computational complexity—are addressed. Numerical tests here presented have a twofold aim: to show that numerical solutions match the expected theoretical rate of convergence, and that our model can provide a preliminary valuable tool to face problems of clinical relevance.
Constant rank theorems for Li-Yau-Hamilton type matrices of heat equations
Authors: Shi Shujun , Zhang Wei
Published: February 2022

In this paper, we prove constant rank theorems for Li-Yau-Hamilton type matrices of heat equations on Riemannian manifolds as well as on Kähler manifolds under some curvature conditions.
Sharing pizza in 𝑛 dimensions
Authors: Ehrenborg Richard , Morel Sophie , Readdy Margaret
Published: February 2022

We introduce and prove the

n
n

-dimensional Pizza Theorem: Let

H

\mathcal {H}

be a hyperplane arrangement in 

R

n

\mathbb {R}^{n}

. If

K
K

is a measurable set of finite volume, the pizza quantity of

K
K

is the alternating sum of the volumes of the regions obtained by intersecting

K
K

with the arrangement 

H

\mathcal {H}

. We prove that if

H

\mathcal {H}

is a Coxeter arrangement different from

A

1

n

A_{1}^{n}

such that the group of isometries

W
W

generated by the reflections in the hyperplanes of

H

\mathcal {H}

contains the map

−

i
d

-\mathrm {id}

, and if 

K
K

is a translate of a convex body that is stable under

W
W

and contains the origin, then the pizza quantity of 

K
K

is equal to zero. Our main tool is an induction formula for the pizza quantity involving a subarrangement of the restricted arrangement on hyperplanes of

H

\mathcal {H}

that we call the even restricted arrangement. More generally, we prove that for a class of arrangements that we call even (this includes the Coxeter arrangements above) and for a sufficiently symmetric set

K
K

, the pizza quantity of

K
+
a

K+a

is polynomial in

a
a

for

a
a

small enough, for example if

K
K

is convex and

0
∈
K
+
a

0\in K+a

. We get stronger results in the case of balls, more generally, convex bodies bounded by quadratic hypersurfaces. For example, we prove that the pizza quantity of the ball centered at

a
a

having radius

R
≥
‖
a
‖

R\geq \|a\|

vanishes for a Coxeter arrangement

H

\mathcal {H}

with

|

H

|

−
n

|\mathcal {H}|-n

an even positive integer. We also prove the Pizza Theorem for the surface volume: When

H

\mathcal {H}

is a Coxeter arrangement and

|

H

|

−
n

|\mathcal {H}| - n

is a nonnegative even integer, for an

n
n

-dimensional ball the alternating sum of the

(
n
−
1
)

(n-1)

-dimensional surface volumes of the regions is equal to zero.
A relation among Hopkins’ Picard groups of the localized categories with respect to finite wedges of the Morava 𝐾-theories
Authors: Shimomura Katsumi
Published: February 2022

We work in the stable homotopy category of

p
p

-local spectra for a fixed prime number

p
p

. Let

E
E

be a spectrum and

L

E

\mathcal {L}_E

denote the stable homotopy category of localized spectra with respect to

E
E

in the sense of Bousfield. Then, M. Hopkins introduced a Picard group

P
i
c
(

L

E

)

Pic(\mathcal {L}_E)

of the category

L

E

\mathcal {L}_E

. If the spectra

E
E

and

F
F

satisfy the relation

⟨

E

⟩

≥

⟨
F
⟩

\left \langle {E}\right \rangle \ge \left \langle F\right \rangle

of the Bousfield classes, then we have a homomorphism

ℓ
:
P
i
c
(

L

E

)
→
P
i
c
(

L

F

)

\ell \colon Pic(\mathcal {L}_E)\to Pic(\mathcal {L}_F)

. We consider the spectra

K
m
n

=
E
(
n
)
∧
M

J
m

K_m^n=E(n)\wedge MJ_m

for the

n
n

-th Johnson-Wilson spectrum

E
(
n
)

E(n)

and a type

m
m

generalized Moore spectrum

M

J
m

MJ_m

for

0
≤
m
≤
n

0\le m\le n

. For

E
=

K
m
n

E=K_m^n

, we have a subgroup

P
i

c
0

(

L

E

)

Pic^0({\mathcal {L}_E})

of

P
i
c
(

L

E

)

Pic(\mathcal {L}_E)

consisting of exotic elements. In this paper, we study the homomorphism
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="script l colon upper P i c Superscript 0 Baseline left-parenthesis script upper L Subscript upper E left-parenthesis n right-parenthesis Baseline right-parenthesis right-arrow upper P i c Superscript 0 Baseline left-parenthesis script upper L Subscript upper K Sub Subscript m Sub Superscript n Subscript Baseline right-parenthesis">

ℓ
:
P
i

c
0

(

L

E
(
n
)

)
→
P
i

c
0

(

L

K
m
n

)

\ell \colon Pic^0({\mathcal {L}_{E(n)}})\to Pic^0({\mathcal {L}_{K_m^n}})

, and give conditions under which it is an isomorphism. This is a generalization of the result

P
i

c
0

(

L

2

)
≅

κ
2

Pic^0(\mathcal {L}_2)\cong \kappa _2

(P. Goerss, H.-W. Henn, M. Mahowald, and C. Rezk [J. Topol. 8 (2015), 267–294, Remark. 6.5]) for

(
p
,
n
,
m
)
=
(
3
,
2
,
2
)

(p,n,m)=(3,2,2)

.
Effects of Chronic Burden Across Multiple Domains and Experiences of Daily Stressors on Negative Affect
Authors: Lockwood Kimberly G , Peddie Luke , Crosswell Alexandra D , Hives Benjamin A , Slopen Natalie , Almeida David M , Puterman Eli
Published: February 2022

Background

Exposure to chronic psychological stress across multiple life domains (multi-domain chronic burden) is associated with poor health. This may be because multi-domain chronic burden influences daily-level emotional processes, though this hypothesis has not been thoroughly tested.

Purpose

The current study tested whether (a) multi-domain chronic burden is associated with greater exposure to daily stressors and (b) multi-domain chronic burden compounds negative affect on days with stressors compared to stressor-free days.

Methods

The MIDUS Study (Wave II) and the National Study of Daily Experiences sub-study were conducted from 2004 to 2006 (N = 2,022). Participants reported on eight life domains of psychological stress used to create a multi-domain chronic burden summary score. For eight consecutive days, participants reported the daily occurrence of stressful events and daily negative affect.

Results

Participants with greater multi-domain chronic burden were significantly more likely to report daily stressors. There was also a significant interaction between multi-domain chronic burden and daily stressors on negative affect: participants with higher multi-domain chronic burden had greater negative affect on stressor days than stressor-free days compared to those with lower multi-domain chronic burden.

Conclusion

Participants with higher multi-domain chronic burden were more likely to report daily stressors and there was a compounding effect of multi-domain chronic burden and daily stressors on negative affect. These results suggest that experiencing a greater amount of psychological stress across multiple life domains may make daily stressors more toxic for daily affect.