Uniformity Index Research Articles

Reef fish community structure in the waters of small islands Central Bangka Regency

This study aimed to analyze the community structure of reef fish in the small island waters of Central Bangka. The research was conducted in March 2022 in the waters of Bebuar Island, Ketugar Island, Ketawai Island, and Gusung Asam Central Bangka Regency, Bangka Belitung Islands Province. The coral reef survey method uses purposive sampling and the coral reef fish visual census with data analysis of abundance, diversity index, uniformity, and dominance. In-site water quality measurements included six parameters: temperature, salinity, current, brightness, depth, and pH. The results showed that coral reef cover from 44.60 - 87.00% with the medium to very good category. The abundance of reef fish from 1 to 3 individuals/m2 was dominated by 18 species of the Pomacentridae family. The reef fish diversity index ranged from 2.47 to 2.90, including the medium category. The uniformity index value ranged from 0.79 - 0.94, including the high category, indicating that the species found were evenly distributed across all stations. The dominance index value ranges from 0.07 to 0.15, including low, where no species dominates significantly and the fish are evenly distributed. Temperature, brightness, pH, and salinity are factors that support the growth of coral and reef fish. A water current speed of 0.05 – 0.20 m/s is quite helpful in cleaning coral reefs from mud and can supply oxygen. Water conditions were categorized as good and fulfilled the seawater quality standards.

Spray performance of flexible shield canopy opener and rotor wind integrated boom-sprayer application in soybean: effects on droplet deposition distribution.

Canopy density is high during mid-to-late soybean growth as a result of dense planting to improve yield, which seriously affects the control of pests and diseases. The dilemmas of difficult droplet penetration, nonuniform deposition, and droplet drift in field spraying remain challenges to the precise control of droplet distribution. This paper proposed a novel spraying application mode combined flexible shield canopy opener (FSCO) with rotor wind. The design of the key components of the new boom-spraying machine are described. The effects of the comparative spraying modes on spray deposition and droplet drift were studied in a field validation test to explore the feasibility of the novel spraying application. The study found that droplet coverage inside the soybean canopy was significantly affected by spraying mode, rotor wind speed and opener depth. The spraying operation that used the FSCO and rotor wind integrated mode was optimal for droplet uniformity on the adaxial and abaxial surfaces of the canopy leaves, with droplet uniformity indices of 0.966 and 0.934, respectively. At a rotor wind speed of 6 m s-1 and opener depth of 15 cm, the soybean canopy droplet coverage uniformity effect achieved the highest composite score of 0.937. The spraying mode used in this study improved droplet coverage uniformity by 82.30% and droplet anti-drift performance improved by 99.73% compared to the conventional boom-spraying mode. The study shows validity of the spraying mode combined FSCO with rotor wind to open dense canopy and improved droplet deposition uniformity in canopy and anti-drift performance. © 2024 Society of Chemical Industry.

Diversity and Abundance of Plankton From Peunaga, Cut Ujong Estuary, Meulaboh, West Aceh

ABSTRACTThe research aims to determine the structure of the plankton community in the waters of Gampong Peunaga Cut Ujong, Meureubo, Meulaboh, West Aceh. The study was conducted in September 2023. The collection point consisted of 3 stations, and sampling was carried out at high tide with three repetitions. The filtering process uses a plankton net with a mesh size of 30 µm. Phytoplankton at the research location consists of five classes, namely Cyanophyceae, Euglenophyceae, Chlorophyceae, Bacillariophyceae, and Dinophyceae. Meanwhile, zooplankton consists of 7 groups consisting of Protozoa, Rotifera, Crustacea, Polychaeta, Gastropoda, Pelecypoda, and Nematoda. Phytoplankton has the highest percentage in the Bacillariophyceae class, reaching 71.7%, and the lowest 1% (Dinophyceae, Euglenophyceae, and Chlorophyceae). The abundance of phytoplankton at station three during the study ranged between 2,025,600 cells/m3 - 6,710,400 cells/m3 and zooplankton in the range of 23,400 ind/m3 - 33,480 ind/m3. The average diversity index (H') for phytoplankton was 1.04, the uniformity index (E) was 0.40, and the dominance index (C) was 0.50. Meanwhile, zooplankton has values H' (1.42), E (0.65), and D (0.36). To maintain the Peunaga estuary area as an ideal buffer area, it is recommended to regularly monitor the community structure of aquatic biota (plankton, benthos, and fish).Keywords: buffer ecosystem, community structure, dominance index, Navicula sp.

Duration of Rainfall Fades in GeoSurf Satellite Constellations

We have studied the stochastic processes A and B concerning fade durations due to rain, by simulating attenuation time series A(t) (dB) in the zenith paths of GeoSurf satellite constellations, at sites located in different climatic regions, with the Synthetic Storm Technique. Process B gives the statistics of outages (occurrences) and process A gives the statistics of outage duration (fraction of time), for the same rain attenuation threshold A(t)>S. The two processes are not independent; therefore, we have studied the relationship between their probabilities and defined a uniformity index 0<U(S)≤1. U(S) is useful for comparing real cases–fade durations fragmented in many different intervals, with changing S and site—and the limiting case of all fades lasting the same time. As S increases, U(S) increases, approaching 1 at very large thresholds. These results should guide the designers of satellite constellations to consider the impact of A(t) on diverse communications services. Process B (occurrences) impacts mainly on non–real-time services, such as data delivery, more disturbed by the number of outages rather than by their duration. Process A (fraction of time) impacts mainly on real–time services such as television, video conference etc., more disturbed by the duration of the outage.

Structure of Plankton Communities on The Kalianda Coast, South Lampung

The presence of plankton is very important for aquatic ecosystems. Kalianda Coastal Beach has direct access to the open sea. Its water condition can experience changes including physical, chemical, and biological conditions. Moreover, the beaches in the Kalianda coastal area are widely used for vannamei shrimp breeding, ferry port, fishery and trade port. The purpose of this study was to evaluate the structure of the plankton community, including abundance and species composition, diversity index, uniformity, and dominance. This study used data from water sources in three vannamei shrimp nurseries located in Kalianda Coastal Beach, South Lampung. Water parameters observed in Kalianda Coastal were plankton, salinity, pH, nitrate, ammonia, dissolved solids (TSS), and phosphate. The results showed that the plankton found in Kalianda coastal area consisted of four classes, phytoplankton namely Bacillariophyceae (78.75%) and Dynophyceae (9.85%), zooplankton Ciliata (7.79%) and Crustacea (3.61%). The range of phytoplankton abundance is 2392-3029 cells/l, while the abundance of zooplankton is 279-414 ind/l. Plankton diversity and uniformity indices are high meaning that the plankton community in Kalianda Coast is very diverse and stable, low dominance means that there are plankton that dominate, namely from the Bacillariophyceae class. The structure of the plankton community in Kalianda Coastal Beach shows a stable condition at the time of the research. To know the plankton community structure more thoroughly, it is necessary to take plankton samples every season with more station points.

PENILAIAN TINGKAT REKRUTMEN KARANG KERAS (SCLERACTINIA) DI TAMAN LAUT PANDANAN, LOMBOK UTARA, NUSA TENGGARA BARAT UNTUK MENDUKUNG UPAYA RESTORASI

Pandanan Marine Technopark has a flat topography in the middle, and hills on the southwest and northeast sides. Based on a survey using the manta tow method that has been carried out by researchers in 2021, the sea water conditions are clear but the coral reefs are not good. One of the factors suspected to be the cause of the poor condition of the coral reefs in Pandanan Marine Technoark is that many fishermen used to use bombs to catch fish. One of the efforts made by the government and the local (POKMASWAS) to restore the coral reef ecosystem in the Pandanan Marine Technopark is by creating a program to restore corals asexually using coral transplant media. Until now, no research has been conducted in Pandanan Marine Technopark on the sexual recovery of coral reef ecosystems using a coral recruitment level approach.Coral reefs are a group of zooxanthellae symbiotic animals that are very vulnerable to environmental changes. Meanwhile, coral recruitment is a process in which new individual corals are formed through coral reproduction and then join the coral community by forming new colonies. The method used in this study is Underwater Photo Transect (UPT) method and quantitative analysis method consisting of analysis of coral recruitment data for identification of coral recruitment genus, diversity index, uniformity index and dominance index. The results of the recruitment rate for hard corals (Scleractinia) in Pandanan Marine Technopark showed that the recruitment results were based on the lifeforms found including branching, massive, and free living. Meanwhile, the substrate that recruited coral grows the most is Dead Coral with Algae. There were 7 genus found which included Acropora, Favia, Montastrea, Stylophora, Pocilopora, Leptastrea, and Fungia. Most coral recruitment was found at Station 1 with a depth of 3 meters and the lowest number was at Station 3 with a depth of 3 meters. The average Diversity Index is 1.08, which means that the diversity is relatively small and the ecological pressure is very strong. The average uniformity index was 0.91 which means high uniformity and stable community. Furthermore, the average Dominance Index is 0.51, which means moderate dominance

Synthesis of mesocarbon microbeads from high‐temperature coal tar pitch: Effects of quinoline insoluble

AbstractMesocarbon microbeads (MCMBs) were a kind of functional artificial carbon materials, which was widely used in varied areas with its excellent properties. MCMB was generally produced by thermal‐polymerization of high‐temperature coal tar pitch under oxygen‐free atmosphere. Generally, the content of primary quinoline insoluble (PQI) play a key role on the quality of the derived MCMB. In order to confirm the relationship between the content of PQI and the properties of MCMB, 15 kinds of high‐temperature coal tar pitch with varied content of PQI were used as the raw materials to produce MCMB. The particle size distribution, optical micro‐structure, surface morphology, and carbon micro‐crystalline of calcinated MCMB were determined in this work. The results shown that the content of PQI from 7% to 13% was a suitable content to generate high quality MCMB. What is more, the derived MCMB has a high yield of 33.09% with good sphericity, the uniformity index of particle size was 1.02, and the graphite carbon content of calcinated MCMB (calcinated temperature of 1100°C) was 79.92%. Thus, the high‐temperature coal tar pitch with the PQI content of 7%–13% was the preferably raw materials to produce high‐quality MCMB by thermal‐polymerization method.

Evaluation of Rock and Explosive Properties for Fragmentation Characterization: An Application of WipFrag

This study investigates the rock explosive properties in selected Lokoja quarries, Nigeria, with the goal of characterizing fragmentation for optimized downstream operations. The analysis includes porosity, UCS values, and permeability assessment in Gitto quarry, highlighting advantages in material application. Comparisons between rock formations (Q1 and Q2) reveal varying compressive strengths, crucial for determining appropriate explosive energy for efficient fragmentation. Blast design parameters from Q1 and Q2 indicate consistent values, aiding in operational planning. Fragmentation analysis, conducted using WipFrag software, delineates size ranges and classifies the blast as having a moderate distribution. Correlations between blast fragmentation size and powder factor underscore the impact on efficiency. A classification chart and table are presented for convenient interpretation of results, providing valuable insights for enhancing blasting practices in Lokoja quarries and ultimately improving productivity. The fragmentation analysis result carried out in this study using WipFrag software shows that the 50%, 80% and Maximum block size passing size ranges from 539.94 – 1349.53 mm, 690.07 – 1907.81 mm, 808-2280 mm respectively. The blast fragmentation sizes are classified as moderate distribution blast based on the uniformity index value ranging from 1.95 to 2.4. The relationship between blast fragmentation size and powder factor was evaluated using linear correlation coefficient. It was noted that, X20, X50, X80 has high R2 values greater than 60% respectively

Gastropod Community Structure in the Mangrove Area, Kuala Batee District, Southwest Aceh District

This research was conducted to determine the types of gastropods and the structure of the gastropod community in the Mangrove area of Kuala Batee District, Southwest Aceh Regency. The quantitative descriptive method is used to determine research stations using purposive sampling techniques. Gastropod sampling was carried out at three station locations, each station consisting of three sub-stations with a size of 10 x 10 m. In the substations, 15 transects measured 1 x 1 m, namely, two points at the corner of each transect and one point in the middle. The results of the research showed that the gastropods found were 11 species from 4 ordo, ordo Archaeogastropoda consists of Neritina turita, N.semiconica, N.variegate, Neritodryas dubia, and Clithon corona, ordo Ceanogastropoda consists of Faunus ater and Bitium munitum, ordo Mesogastropoda consists of Cerithidea optusa, Stenomelania plicaria, and Thiara scabra, ordo Ellobiida consist of Cassidula angulifera. The structure of the gastropod community in the mangrove area of Kuala Batee District, Southwest Aceh Regency, has a diversity index ranging from 0.65-1.32, including the medium category, uniformity index values ranging from 0.36-0.63 including the medium category, and dominance values ranging from between 0.33-0.63 is included in the medium category. Environmental parameters in the mangrove area show an average temperature value of 28.20C, a salinity value of 5.6 ppt, and a pH value of 8.3

Effect of liquid nitrogen spray freezing on the ice crystal size and quality of large yellow croaker

Large yellow croakers (Larimichthys crocea) were frozen by liquid nitrogen spray freezing (LNSF), liquid immersion freezing (LIF), and air freezing (AF), and the freezing rate, ice crystal size and product qualities were compared. LNSF was found to be a promising freezing technology because of the significantly (P < 0.05) shortest freezing time, smallest ice crystal, and best overall product quality. Then, the effect of processing parameters during LNSF on freezing characteristics, and microstructure and qualities of samples was studied. Freezing time was reduced by decreasing freezing temperature and increasing air velocity. A size uniformity index was proposed in this study to evaluate the distribution uniformity of ice crystals. The minimum cross-sectional area (605.83 μm2) with the best size uniformity was achieved at a freezing temperature of −90 °C, a final temperature of −30 °C, and an air velocity of 4 m/s, showing a reduction of 50.90% as compared to the maximum (1233.77 μm2). The qualities of samples frozen by LNSF with the aforementioned parameter values were well maintained and met the industrial standard. Therefore, the developed LNSF protocol was recommended for the industrial application for large yellow croaker.

UAV-Assisted Dynamic Monitoring of Wheat Uniformity toward Yield and Biomass Estimation.

Crop uniformity is a comprehensive indicator used to describe crop growth and is important for assessing crop yield and biomass potential. However, there is still a lack of continuous monitoring of uniformity throughout the growing season to explain their effects on yield and biomass. Therefore, this paper proposed a wheat uniformity quantification method based on unmanned aerial vehicle imaging technology to monitor and analyze the dynamic changes in wheat uniformity. The leaf area index (LAI), soil plant analysis development (SPAD), and fractional vegetation cover were estimated from hyperspectral images, while plant height was estimated by a point cloud model from RGB images. Based on these 4 agronomic parameters, a total of 20 uniformity indices covering multiple growing stages were calculated. The changing trends in the uniformity indices were consistent with the results of visual interpretation. The uniformity indices strongly correlated with yield and biomass were selected to construct multiple linear regression models for estimating yield and biomass. The results showed that Pielou's index of LAI had the strongest correlation with yield and biomass, with correlation coefficients of -0.760 and -0.801, respectively. The accuracies of the yield (coefficient of determination [R 2] = 0.616, root mean square error [RMSE] = 1.189 Mg/ha) and biomass estimation model (R 2 = 0.798, RMSE = 1.952 Mg/ha) using uniformity indices were better than those of the models using the mean values of the 4 agronomic parameters. Therefore, the proposed uniformity monitoring method can be used to effectively evaluate the temporal and spatial variations in wheat uniformity and can provide new insights into the prediction of yield and biomass.

Prestress analysis and geometry optimization for conical cable domes with zero Gaussian curvature

The conical cable dome with a rotating cone and zero Gaussian curvature is a new type of cable dome with the generatrix that follows a straight line. The paper studies the prestress design and mechanical properties of such cable domes. First, on the basis of the section and vertical diagrams of the proposed cone, a simplified method is developed to calculate feasible prestresses of cables and struts using the principle of nodal balance. Second, prestress distribution, load-bearing capacity, and prestress of the conical cable domes with 15 different combinations of rise-span ratio and inner triangular slope under both prestress and load states are studied. Additionally, the paper proposes five load conditions to assess the performance of the conical cable domes. Finally, the total strain energy, basic frequency, radial reaction, and gravity are optimized through single-criterion and multi-criterion based on the combination of a genetic algorithm and the Newton iteration method. To keep the outer appearance of the conical cable dome, the work selects the strut length as the optimization variable. An optimized conical cable dome is recommended with a low prestress uniformity index and high uniformity index. The results indicate that the conical cable dome is sensitive to the asymmetrical loads, especially the wind loads. For the single-criterion optimization, the structure with the basic frequency under loads as the objective function has the best load-bearing capacity. After optimization, the maximum nodal displacement is 32% and 43% of the original one under LC4 and LC5. Besides, to get a synthetic optimization result, a multi-criterion optimization is suggested.

The Effect of Planting Dates and Planting Methods on Cotton Quantitative and Qualitative Traits in Moderate and Humid Climatic Conditions

otton is one of the most important crops in Golestan Province, Iran. The planting and harvesting date interferes with autumn crops such as wheat. A delay in planting cotton causes a decrease in yield. Transplanting cultivation can help to solve this problem. For this purpose, an experiment was carried out during two crop years in 2017 and 2018 in Iran, Golestan Province, Gorgan city, research station of Iraqi Mahlah in the form of a split plot based on randomized complete blocks design in four replications. Experimental treatments including planting dates at three levels including; Planting dates were May 27, June 16 and July 7 and planting methods were in seven levels (6 treatments using Transplanting and direct seeding methods). Quantitative traits including plant height, number of bolls per plant, lint weight per boll, lint yield and biological yield were measured along with cotton qualitative traits such as fiber length, stretch percentage, fiber fineness, fiber strength and uniformity index. Based on the results, the simple effect of planting dates, planting methods, as well as the interaction effect of planting dates × planting methods on all quantitative and qualitative traits were significant. Also, the interaction effect of year × planting date × planting method on the number of bolls per plant and biological yield was significant. The average lint yield in transplanting methods was 2256 kg per hectare and showed an increase of about 37% compared to direct seeding cultivation method. The best cultivation method it was that one with one seedling transplanted, the distance between the rows=75 cm and the distance on the rows=40 cm, the yields being higher as compared to other treatments. In general, the lint yield in direct seeding was much lower than the lint yield in transplanting cultivation. Also, the quality traits were affected by planting dates and planting methods, and in most cases, cotton quality traits were improved in the transplanting cultivation method. Therefore, if the cost of producing and transporting seedlings is economical, cotton transplanting is preferable to direct seeding cultivation.

Avaliação da trabalhabilidade de pastas cimentícias autonivelantes através da variação do teor dos aditivos superplastificante e modificador de viscosidade

Abstract To meet the self-leveling pastes’ performance requirements, its flowability is linked to the absence of segregation or exudation, which makes a high cohesion between the components mandatory. Therefore, the ideal dosage for these materials is an essential topic to provide such specific properties. To evaluate the composition effect on fresh state, a method was proposed to quantify self-leveling pastes’ uniformity through the analysis of the spread pastes’ diameter and borders. Thus, different dosages were tested varying some input contents. The uniformity was quantified with the development of indexes such as Perimeter Ratio (PR) and Input Relation (IR). It was concluded that lower spread diameters incurred in higher uniformity index. Furthermore, it was observed that to achieve an ideal dosage for pastes, there is a tendency of direct correlation between the uniformity index and the water/powder ratio (w/p) and superplasticizer (SP) content and an inverse one between it and viscosity modifying admixture (VMA).

Assessment of different head tilt angles in volumetric modulated arc therapy for hippocampus-avoidance whole-brain radiotherapy.

In the field of radiation therapy for brain metastases, whole-brain hippocampus-avoidance treatment is commonly employed. this study aims to examine the impact of different head tilt angles on the dose distribution in the whole-brain target area and organs at risk. It also aims to determine the head tilt angle to achieve optimal radiation therapy outcomes. CT images were collected from 8 brain metastases patients at 5 different groups of head tilt angle. The treatment plans were designed using the volumetric modulated arc therapy (VMAT) technique. The 5 groups of tilt angle were as follows: [0°,10°), [10°,20°), [20°,30°), [30°,40°), and [40°,45°]. The analysis involved assessing parameters such as the uniformity index, conformity index, average dose delivered to the target, dose coverage of the target, hot spots within the target area, maximum dose, and average dose received by organs at risk. Additionally, the study evaluated the correlation between hippocampal dose and other factors, and established linear regression models. Significant differences in dosimetric results were observed between the [40°,45°] and [0°,10°) head tilt angles. The [40°,45°] angle showed significant differences compared to the [0°,10°) angle in the average dose in the target area (31.49 ± 0.29 Gy vs. 31.99 ± 0.29 Gy, p=0.016), dose uniformity (1.20 ± 0.03 vs. 1.24 ± 0.03, p=0.016), hotspots in the target area (33.64 ± 0.35 Gy vs. 34.42 ± 0.49 Gy, p=0.016), maximum hippocampal dose (10.73 ± 0.36 Gy vs. 11.66 ± 0.59 Gy, p=0.008), maximum dose in the lens (2.82 ± 1.10 Gy vs. 4.99 ± 0.16 Gy, p=0.016), and average dose in the lens (1.93 ± 0.29 Gy vs. 4.22 ± 0.26 Gy, p=0.008). There is a moderate correlation between the maximum dose in the hippocampi and the PTV length (r=0.49, p=0.001). Likewise, the mean dose in the hippocampi is significantly correlated with the hippocampi length (r=0.34, p=0.04). The VMAT plan with a head tilt angle of [40°,45°] met all dose constraints and demonstrated improved uniformity of the target area while reducing the dose to organs at risk. Furthermore, the linear regression models suggest that increasing the head tilt angle within the current range of [0°,45°] is likely to lead to a decrease in the average hippocampal dose.

Diversity of the Ground Cover Crop Nephrolepis Biserrata in Oil Palm Plantations on Various Soil Types

Ground cover crops play an important role in maintaining the ecological balance in oil palm plantations. Nephrolepis biserrata, as a cover crop species, has not been extensively studied, especially in relation to soil type and vegetation level. This study aimed to analyze the distribution and dominance of Nephrolepis biserrata in oil palm plantations on various soil and vegetation levels. This quantitative research was conducted in oil palm plantations in Central Kalimantan Province using a survey method with purposive sampling. Nine treatment combinations of three soil types (Histosols, Ultisols, and Spodosols) and three vegetation levels (low, medium, and high) were tested on 81 test plots. Data analysis includes diversity index (Ĥ), uniformity index (E), dominance index (C), importance value index (INP), and relative dominance (DR). The results of the research show that N. biserrata has good adaptability and dominance as a ground cover crop in the producing crop (TM) phase in oil palm plantations, especially on Spodosol-type soils. Nephrolepis exaltata and Nephrolepis biserrata showed the highest INP in Ultisols (76.65%; 7.64%), Spodosols (48.03%; 82.75%), and Histosols (61.34%; 23.98%). There are no cover crop species that dominate exclusively in all soil types (0.078-0.185). Ultisols have high cover crop diversity (3,107), whereas Spodosols (2,130) and Histosols (2,595) have medium diversity. Ageratum conyzoides (15.08%) and Paspalum dilatatum (10.06%) also had significant INP in all soil types. Different soil conditions influence the number of cover crop vegetation species and communities in oil palm plantations.

Experimental results of the improved cotton regenerator under production conditions

The research article focuses on the application of an enhanced cotton regenerator in the Independence cotton cleaning technology within the TST AGRO cluster, presenting compelling results. The study assessed various key parameters related to cotton fiber quality to compare the performance of the improved cotton regenerator with the existing technology. Several crucial quality indicators were examined during the research, including the length uniformity index of cotton fiber (Unf), relative breaking strength (Str), the number of impurities in cotton fiber (Cnt), the amount of short fibers (SFI), and contamination with non-fibrous impurities. Additionally, changes in the color index (T) and quality aspects such as the degree of yellowness (+b) of the fiber were thoroughly investigated. The research findings revealed that the quality indicators of cotton fiber produced using the improved cotton regenerator surpassed those achieved with the existing regenerator technology. This suggests that the enhancements made to the regenerator positively influenced critical aspects of cotton fiber quality, including fiber length uniformity, breaking strength, impurity levels, and overall cleanliness. Moreover, the study examined color-related parameters, indicating that the improved regenerator contributed to maintaining or enhancing the fiber's color quality. The results of this research signify the potential benefits of implementing the improved cotton regenerator in the Independence cotton cleaning technology. This advancement has the capacity to positively impact the textile industry by delivering cotton fibers with superior qualities, thereby contributing to the overall improvement of cotton processing and manufacturing processes within the TST AGRO cluster.

Analisis Struktur Komunitas Hutan Bakau Di Pantai Paradiso Kelurahan Oesapa Barat Kecamatan Kelapa Lima Kota Kupang

Mangroves have high ecological and economic value for local communities, as spawning grounds, nursery grounds, feeding grounds for marine life, and act as protection against abrasion. Protected mangrove forests provide many choices for coastal communities to meet economic needs. However, the activities and exploitation of humans that increase from time to time can threaten, destroy and even reduce the stability of the life, quantity and quality of mangrove forests. This study aims to determine the physical and chemical parameters of the environment, the species composition and structure of the mangrove forest community in Paradiso Beach, Oesapa Barat Village, Kelapa Lima District, Kupang City. This research is quantitative descriptive. This research is located at Paradiso Beach, Oesapa Barat Village, Kelapa Lima District, Kupang City. Methods of data collection by making observations and recording the results of observations and interviews in the field, analysis in the laboratory and documentation. Data analysis begins with data collection, data reduction, data presentation and drawing conclusions. The results showed that station I had parameters of temperature (270C), pH (8.08), salinity (20.5‰), DO (6.42mg/l) and station II had parameters of temperature (280C), pH (7.99), salinity (21.7‰), DO (7.43 mg/l), the parameters of the two points of this station meet the environmental quality standards for mangrove forest communities. The composition of mangrove forest types at the two station points only consisted of 3 families with 3 mangrove species, namely Sonnetaria alba, Rhizophora apiculata, and Avicennia alba. Community structures of the mangrove forest at station I and station II were categorized as damaged with rare criteria at the tree level, sapling level and seedling level. Importance Value Index (INP) of station I (258%) and station II (222.1%), this shows that Sonneratia alba has a higher level of spatial tenure in mangrove forest communities, diversity index (H') at station I (0.64) and station II (0.71), this shows that the mangrove forest community has environmental stability. and the uniformity index (J') of station I (0.68) and station II (0.76), this shows an unbalanced distribution pattern between tree species in mangrove forest communities, and dominance index (D) of station I (0,61) and Station II (0.51), this shows the concentration and distribution of the dominant Sonneratia alba species in the mangrove forest community of Paradiso Beach, West Oesapa Village, Kelapa Lima District, Kupang City.

Studi Asosiasi Kepiting (Brachyura) dengan Mangrove di Kecamatan Kamal Kabupaten Bangkalan Madura

Kamal District has a mangrove ecosystem area which is a habitat for marine life, including crabs. This study aims to determine the association of Crabs with Mangroves in Kamal District, Bangkalan Regency, Madura. This research uses quantitative methods with the type of survey research and the technique used is purposive sampling. The sampling method uses ladder transect. Based on the results, mangrove data were obtained which were classified into 4 families, 4 genera and 7 species. While crabs consist of 2 families, 4 genera and 4 species. The average value of the mangrove ecological index consists of a diversity index of 1.28 in a medium category, a uniformity index of 0.66 in a high category and a dominance index of 0.32 in a medium category. The average value of the Crab ecological index consists of a diversity index of 1.24 in a medium category, a uniformity index of 0.89 in a high category and a dominance index of 0.32 in a medium category. The result of the ꭓ2 test are that there are 4 positive associations, 2 negative associations and 22 no associations.

Investigation of an improved cold plate design with circuitous minichannel: a computational study involving the effect of conjugate heat transfer

Purpose This study aims to investigate a new circuitous minichannel cold plate (MCP) design involving flow fragmentation. The overall thermal performance and the temperature uniformity analysis are performed and compared with the traditional serpentine design. The substrate thickness and its thermal conductivity are varied to analyse the effect of axial-back conduction due to the conjugate nature of heat transfer. Design/methodology/approach The traditional serpentine minichannel is modified into five new fragmented designs with two inlets and two outlets. A three-dimensional numerical model involving the effect of conjugate heat transfer with a single-phase laminar fluid flow subjected to constant heat flux is solved using a finite volume-based computational fluid dynamics solver. Findings The minimum and maximum temperature differences are observed for the two branch fragmented flow designs. The two-branch and middle channel fragmented design shows better temperature uniformity over other designs while the three-branch fragmented designs exhibited better hydrodynamic performance. Practical implications MCPs could be used as an indirect liquid cooling method for battery thermal management of pouch and prismatic cells. Coupling the modified cold plates with a battery module and investigating the effect of different battery parameters and environmental effects in a transient state are the prospects for further research. Originality/value The study involves several aspects of evaluation for a conclusive decision on optimum channel design by analysing the performance plot between the temperature uniformity index, average base temperature and overall thermal performance. The new fragmented channels are designed in a way to facilitate the fluid towards the outlet in the minimum possible path thereby reducing the pressure drop, also maximizing the heat transfer and temperature uniformity from the substrate due to two inlets and a reversed-flow pattern. Simplified minichannel designs are proposed in this study for practical deployment and ease of manufacturability.