bluuebunny/crossref_metadata_2025 huggingface dataset:
Model of nutritional care in older adults: improving the identification and management of malnutrition using the Mini Nutritional Assessment–Short Form (MNA
Authors: Charlton Karen , Walton Karen , Brumerskyj Kate , Halcomb Elizabeth , Hull Alycia , Comerford Teagan , do Rosario Vinicius Andre
Published: December 2021

Despite clinical guidelines recommending routine nutrition screening, malnutrition in community-living older adults remains under-recognised. This study evaluated the uptake of a model of nutritional care in older adults designed to improve the identification and management of malnutrition. A pragmatic quasi-experimental study was conducted in eight general practices in regional New South Wales between January 2017 and June 2018. Study participants comprised GPs and practice nurses who participated in a training event on the identification and management of malnutrition and patients (aged >65 years) attending the practices recruited to the study. Nutritional screening was conducted using the Mini Nutritional Assessment–Short Form. The specific objectives of the study were to: (1) evaluate the effects of the intervention on knowledge, attitudes and practices of staff related to malnutrition screening using questionnaires and in-depth interviews; and (2) identify patients’ experiences and outcome measures following malnutrition screening through self-completed surveys. Across the eight practices, 11 healthcare professionals completed in-depth interviews. Post-training knowledge surveys (n = 25) identified that knowledge increased in 96% of staff (P < 0.001). Fifty-five older adults who were screened (two malnourished, 10 ‘at risk of malnutrition’) reported an increased awareness of risk factors for malnutrition. This study provides proof-of-concept that a model of care that includes routine malnutrition screening and accompanying pathways for management is acceptable to general practice staff and has promising effects on patient outcomes. However, the low number of patients screened suggests that additional processes are required to improve feasibility (e.g. incorporation into Medicare-funded nurse-led consultations such as the 75+ Health Assessment).
Establishing consensus on key elements and implementation enablers of community-based pain programs to support primary health network decision making: an eDelphi study
Authors: Walker Pippy , De Morgan Simone , Wilson Andrew , Blyth Fiona M.
Published: December 2021

To address the growing burden of chronic pain, there is a need for national scale-up of community-based pain programs. Primary health networks (PHNs) are best placed to support this scale-up as commissioning bodies of health services. The aim of this eDelphi study was to establish expert consensus on best practice key elements of community-based pain programs and enablers important for program implementation and sustainability to support PHN decision making. A panel of experts was invited to complete three online survey rounds as part of a reactive eDelphi approach to provide feedback on the relevance and importance of proposed key elements and implementation enablers of community-based pain programs. Consensus of 70% agreement by experts was required for each survey round for items to remain, with comments from experts considered by the research team to agree on wording changes and the addition of new items. Ten experts (62.5%) completed all three survey rounds. Expert feedback resulted in a list of 18 best practice key elements of community-based pain program design and 14 program implementation enablers. Changes suggested by experts included the moving of items between lists, rephrasing of items and the addition of new items. The eDelphi results will serve as a resource for PHNs considering the commissioning of community-based pain programs and inform future research to assess the suitability and scalability of existing programs.
EIN3 and RSL4 interfere with an MYB–bHLH–WD40 complex to mediate ethylene-induced ectopic root hair formation in
Arabidopsis
Authors: Qiu Yuping , Tao Ran , Feng Ying , Xiao Zhina , Zhang Dan , Peng Yang , Wen Xing , Wang Yichuan , Guo Hongwei
Published: December 2021

Significance

Plant hormones widely regulate reprogramming of stereotypic cell specifications for plants to prevail in ever-changing environments. The well-known observation that ethylene (ET) specifically promotes root hair formation from the N-position epidermal cells provides an excellent model to dissect how such reprograming events are regulated at the molecular level. This work uncovers a molecular mechanism that wires the ET signaling with the root hair specification cascade. Unexpectedly, we found that a well-recognized master regulator of root hair elongation also participates in ET-regulated root epidermal cell specification, implying the internal robustness of root epidermal cell specification.
Ovipleistophora ovariae
. [Descriptions of Fungi and Bacteria].
Authors: Minter D. W.
Published: December 2021

A description is provided for
Ovipleistophora ovariae
. There are only two records of this species in the wild (both on feral fish), from a pond and a small river in Oklahoma. It may, however, be expected in the same freshwater habitats as its known hosts. Some information on its associated organisms and substrata, dispersal and transmission, habitats and conservation status is given, along with details of its geographical distribution (North America (USA (Alabama, Arkansas, California, Illinois, Kansas, Kentucky, Louisiana, Mississippi, Missouri, North Carolina, Oklahoma, Tennessee, Texas))).
Hollow core negative curvature fiber based refractive index sensor design and investigation for tuberculosis monitoring
Authors: Parvin Tarunnum , Abdulrazak Lway Faisal , Zahrani Fahad Ahmed Al , Mitu Sumaiya Akhtar , Hossain Md Nadim , Ahmed Kawsar , Bui Francis M
Published: December 2021

A myriad of pensile but pertinent issues found in the optical fiber sensors can be sought resolution based on the antiresonant reflecting optical waveguide (ARROW) working principle. Due to its compact structure, the anti-resonance based sensor has several advantages such as high sensitivity response, low confinement loss, and high stability that make the sensor more effective for health monitoring. In this manuscript, an anti-resonance fiber sensor has been proposed for the detection of tuberculosis cells. An analytical structure has been explored to simulate the characteristics of the ARROW. For the suggested structure, the Finite Element Method (FEM) is used to conduct its numerical investigations. The proposed optical sensor working on the ARROW principle was implemented on the Comsol Multiphysics software. From the numerical analysis, it is noted that the designed sensor has reached around 99% sensitivity with negligible confinement loss and single modality due to the excellent light-guiding properties of the anti-resonance fiber. Besides, lots of optical parameters such as effective area, V-Parameter, spot-size along beam divergence have been calculated over the wide wavelength region. The achieved result indicates the various application’s suitability of Antiresonant Hollow-Core Fiber (ARHCF) as a tuberculosis sensor.
Impedance matching to axion dark matter: considerations of the photon-electron interaction
Authors: Chaudhuri Saptarshi
Published: December 2021

We introduce the concept of impedance matching to axion dark matter by posing the question of why axion detection is difficult, even though there is enough power in each square meter of incident dark-matter flux to energize a LED light bulb. By quantifying backreaction on the axion field, we show that a small axion-photon coupling does not by itself prevent an order-unity fraction of the dark matter from being absorbed through optimal impedance match. We further show, in contrast, that the electromagnetic charges and the self-impedance of their coupling to photons provide the principal constraint on power absorption integrated across a search band. Using the equations of axion electrodynamics, we demonstrate stringent limitations on absorbed power in linear, time-invariant, passive receivers. Our results yield fundamental constraints, arising from the photon-electron interaction, on improving integrated power absorption beyond the cavity haloscope technique. The analysis also has significant practical implications, showing apparent tension with the sensitivity projections for a number of planned axion searches. We additionally provide a basis for more accurate signal power calculations and calibration models, especially for receivers using multi-wavelength open configurations such as dish antennas and dielectric haloscopes.
Does the reionization model influence the constraints on dark matter decay or annihilation?
Authors: Chen Lu , Wang Ke
Published: December 2021

If dark matter decay or annihilate, a large amount of energy and particles would be released into the cosmic plasma. Therefore, they could modify the thermal and ionization history of our universe, then leave footprints on the cosmic microwave background power spectra.
In this paper, we take dark matter annihilation as an example and investigate whether different reionization models influence the constraints on dark matter annihilation.
We consider the ionization history including both dark matter annihilation and star formation, then put constraints on DM annihilation.
Combining the latest Planck data, BAO data, SNIa measurement, Q
HII constraints from observations of quasars, as well as the star formation rate density from UV and IR data, the optical depth is τ = 0.0571+0.0005
-0.0006 at 68%C.L. and the upper limit of ϵ0
f
d reads 2.7765 × 10-24 at 95%C.L..
By comparison, we also constrain dark matter annihilation in the instantaneous reionization model from the same data combination except the Q
HII constraints and star formation rate density. We get τ = 0.0559+0.0069
-0.0076 at 68%C.L. and the upper limit of ϵ0
f
d is 2.8468 × 10-24 at 95%C.L.. This indicates various reionization models have little influence (≲ 2.5%) on constraining parameters of dark matter decay or annihilation.
Tachyonic preheating in plateau inflation
Authors: Tomberg Eemeli , Veermäe Hardi
Published: December 2021

Plateau inflation is an experimentally consistent framework in which the scale of inflation can be kept relatively low. Close to the edge of the plateau, scalar perturbations are subject to a strong tachyonic instability. Tachyonic preheating is realized when, after inflation, the oscillating inflaton repeatedly re-enters the plateau. We develop the analytic theory of this process and expand the linear approach by including backreaction between the coherent background and growing perturbations. For a family of plateau models, the analytic predictions are confronted with numerical estimates. Our analysis shows that the inflaton fragments in a fraction of an e-fold in all examples supporting tachyonic preheating, generalizing the results of previous similar studies. In these scenarios, the scalar-to-tensor ratio is tiny, r < 10-7.
Magnetic and magnetocaloric effect in a stuffed honeycomb polycrystalline antiferromagnet GdInO3
Authors: Wu Yao-Dong , Duan Wei-Wei , Li Qiu-Yue , Qin Yong-Liang , Zi Zhen-Fa , Tang Jin
Published: December 2021

The magnetic and magnetocaloric properties were studied in a stuffed honeycomb polycrystalline antiferromagnet GdInO3. The onset temperature of antiferromagnetic ordering was observed at ∼ 2.1 K. Negligible thermal and magnetic hystereses suggest a reversible magnetocaloric effect (MCE) in the GdInO3 compound. In the magnetic field changes of 0 kOe–50 kOe and 0 kOe–70 kOe, the maximum magnetic entropy change values are 9.65 J/kg⋅K and 18.37 J/kg⋅K, respectively, near the liquid helium temperature, with the corresponding relative cooling power values of 115.01 J/kg and 211.31 J/kg. The MCE investigation of the polycrystalline GdInO3 serves to illuminate more exotic properties in this frustrated stuffed honeycomb magnetic system.
The transition from conservative to dissipative flows in class-B laser model with fold-Hopf bifurcation and coexisting attractors
Authors: Li Yue , Chen Zengqiang , Yuan Mingfeng , Cang Shijian
Published: December 2021

Dynamical behaviors of a class-B laser system with dissipative strength are analyzed for a model in which the polarization is adiabatically eliminated. The results show that the injected signal has an important effect on the dynamical behaviors of the system. When the injected signal is zero, the dissipative term of the class-B laser system is balanced with external interference, and the quasi-periodic flows with conservative phase volume appear. And when the injected signal is not zero, the stable state in the system is broken, and the attractors (period, quasi-period, and chaos) with contractive phase volume are generated. The numerical simulation finds that the system has not only one attractor, but also coexisting phenomena (period and period, period and quasi-period) in special cases. When the injected signal passes the critical value, the class-B laser system has a fold-Hopf bifurcation and exists torus “blow-up” phenomenon, which will be proved by theoretical analysis and numerical simulation.
Numerical study of a highly sensitive surface plasmon resonance sensor based on circular-lattice holey fiber
Authors: Liao Jian-Fei , Lu Dao-Ming , Chen Li-Jun , Huang Tian-Ye
Published: December 2021

A new design of surface plasmon resonance (SPR) sensor employing circular-lattice holey fiber to achieve high-sensitivity detection is proposed. The sensing performance of the proposed sensor is numerically investigated and the results indicate that our proposed SPR sensor can be applied to the near-mid infrared detection. Moreover, the maximum wavelength sensitivity of our proposed sensor can reach as high as 1.76×104 nm/refractive index unit (RIU) and the maximum wavelength interrogation resolution can be up to 5.68×10−6 RIU when the refractive index (RI) of analyte lies in (1.31, 1.36). Thanks to its excellent sensing performance, our proposed SPR sensor will have great potential applications for biological analytes detection, food safety control, bio-molecules detection and so on.
Structure, phase evolution and properties of Ta films deposited using hybrid high-power pulsed and DC magnetron co-sputtering
Authors: Huang Min , Liu Yan-Song , He Zhi-Bing , Yi Yong
Published: December 2021

Crystalline phase and microstructure control are critical for obtaining desired properties of Ta films deposited by magnetron sputtering. Structure, phase evolution and properties of Ta films deposited by using hybrid high power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (DCMS) under different fractions of DCMS power were investigated, where Ta ion to Ta neutral ratios of the deposition flux were changed. The results revealed that the number of Ta ions arriving on the substrate/growing film plays an important role in structure and phase evolution of Ta films. It can effectively avoid the unstable arc discharge under low pressure and show a higher deposition rate by combining HiPIMS and DCMS compared with only HiPIMS. Meanwhile, the high hardness α-Ta films can be directly deposited by hybrid co-sputtering compared to those prepared by DCMS. In the co-sputtering technology, pure α-Ta phase films with extremely fine, dense and uniform crystal grains were obtained, which showed smooth surface roughness (3.22 nm), low resistivity (38.98 μΩ⋅cm) and abnormal high hardness (17.64 GPa).
Experimental realization of quantum controlled teleportation of arbitrary two-qubit state via a five-qubit entangled state
Authors: Liu Xiao-Fang , Li Dong-Fen , Zheng Yun-Dan , Yang Xiao-Long , Zhou Jie , Tan Yu-Qiao , Liu Ming-Zhe
Published: December 2021

Quantum controlled teleportation is the transmission of the quantum state under the supervision of a third party. This paper presents the theoretical and experimental results of an arbitrary two-qubit quantum controlled teleportation scheme, in which the sender Alice only needs to perform two Bell state measurements and the receiver Bob can perform an appropriate unitary operation to reconstruct the arbitrary two-qubit states under the control of the supervisor Charlie. The operation process of the scheme is verified on the IBM quantum experience platform, and the accuracy of the transmitted quantum state is further checked by performing quantum state tomography. Meanwhile, a good fidelity is obtained by using the theoretical density matrix and the experimental density matrix. A sequence of photonic states is introduced to analyze the possible intercept–replace–resend, intercept–measure–resend, and entanglement–measure–resend attacks on this scheme. The results proved that our scheme is highly secure.
A non-invasive wearable sensory leg neuroprosthesis: mechanical, electrical and functional validation
Authors: Basla Chiara , Chee Lauren , Valle Giacomo , Raspopovic Stanisa
Published: December 2021

Objective. Lower limb amputees suffer from a variety of functional deficits related to the absence of sensory communication between the central nervous system and the lost extremity. Indeed, they experience high risk of falls, asymmetric walking and balance, and low prosthesis embodiment, that significantly decrease their quality of life. Presently, there are no commercially available devices able to provide sensory feedback to leg amputees but recently some invasive solutions (i.e. requiring surgery) have been proposed by different research groups. However, a non-invasive effective alternative exploitable in everyday life is still missing. Approach. To address this need we developed and tested a lightweight, non-invasive, wearable technology (NeuroLegs) providing sensory (i.e. knee angle joint and tactile) feedback to the users through electro-cutaneous stimulation. Standard mechanical and electrical tests were performed to assess the safety and reliability of the technology. The NeuroLegs system was verified in terms of accuracy in measuring relevant gait parameters in healthy participants. The effectiveness of the NeuroLegs system at improving walking of three transfemoral amputees was then verified in movement laboratory tests. Main results. No mechanical failures, stable communication among system’s parts and a long-lasting battery were demonstrated. A high temporal reliability was found when detecting stride features (important for the real-time configuration) with a correct match to the walking cadence in all assessed walking conditions. Finally, transfemoral amputees showed increased temporal gait symmetry and augmented confidence when walking with the sensory feedback compared to no feedback condition. Stepping outside from the lab, NeuroLegs was successfully exploited by a transfemoral amputee in CYBATHLON Global Edition 2020 in several challenging situations related to daily-living activities. Significance. Our results demonstrate that the NeuroLegs system provides the user with useful sensory information that can be successfully exploited in different walking conditions of daily life.
Research on Outage Maintenance Optimization Strategy Based on Improved Multi-Objective Particle Swarm Optimization
Authors: Li Cun , Yuan Ding , Liang Gaige , Liu Lu , Jiang Xuedong
Published: December 2021

With the increasingly complex structure of the transmission system, the impact of power outage caused by faults in the power grid is becoming greater and greater. The power grid shall cut off the maintenance of line equipment to ensure the power supply safety of the system. During the outage maintenance period, how to achieve safe maintenance and low-cost impact is the main content of outage control. Aiming at the problem of outage maintenance, a particle swarm optimization algorithm with the goal of minimum impact, economic optimization and shortest maintenance time is proposed. The game theory is used to select the optimal solution from the solutions of particle swarm optimization algorithm to solve the multi-objective function, so as to improve and ensure the population diversity, realize the efficiency and economy of outage maintenance, and meet the needs of outage plan of large power grid. The effectiveness of the proposed algorithm is further verified by comparing multi class baseline experiments.
On Location Privacy Protection Algorithm Based on Edge Computing and Caching
Authors: Xu Xiaobei , Song Huaju , Zhang Kai , Chen Liwen , Qian Yuwen
Published: December 2021

To resolve the communication overhead problem of anonymous users, we propose a location privacy protection method based on the cache technology. In particular, we first place the cache center on edge server nodes to reduce interaction between servers and users. In this way, the risk of privacy leaks can be reduced. Furthermore, to improve the caching hit rate, a prediction system based on Markov chain is designed to protect the trajectory privacy of mobile users. Simulations show that the algorithm can protect the privacy of users and reduce the transmission delay.
Application of Fuzzy Control Technology in Aerobic Compost Heat Recovery Device
Authors: Guo Changbao
Published: December 2021

The technology of aerobic composting of organic solid wastes has been mature, but the technology of energy recovery and utilization generated by aerobic composting is backward. This paper investigates the status quo of organic solid waste energy conversion and fuzzy control technology. Based on reality, the principle of energy recovery of aerobic composting technology is introduced, the characteristics and advantages of fuzzy control technology are analyzed, and the design of fuzzy control technology for heat recovery device of aerobic composting has improved the utilization rate of energy recovery of aerobic composting. Practice has proved that the introduction of intelligent control technology such as fuzzy control into the control technology of biomass energy recovery is an inevitable trend in the development of new energy field.
A Remote Sensing Image Segmentation Method Based on Fusion Mechanism
Authors: Zhu Shuangling , Mujiang Guli Nazi·Aili , Jumahong Huxidan , Maiti Pazi Laiti·Nuer
Published: December 2021

A U-Net convolutional network structure is fully capable of completing the end-to-end training with extremely little data, and can achieve better results. When the convolutional network has a short link between a near input layer and a near output layer, it can implement training in a deeper, more accurate and effective way. This paper mainly proposes a high-resolution remote sensing image change detection algorithm based on dense convolutional channel attention mechanism. The detection algorithm uses U-Net network module as the basic network to extract features, combines Dense-Net dense module to enhance U-Net, and introduces dense convolution channel attention mechanism into the basic convolution unit to highlight important features, thus completing semantic segmentation of dense convolutional remote sensing images. Simulation results have verified the effectiveness and robustness of this study.
Design of Personalized Recommendation Algorithms based on Big Data Framework
Authors: Liu Fang
Published: December 2021

The issue of information overload has become increasingly prominent since there are various kinds of data generated daily. A good recommendation systems can better deal with such problems. However, traditional recommendation systems for a single machine are suffering from the computing bottleneck in the environment of massive data. An individual recommendation algorithm is unable to gratify desiring users. To tackle this problem, we designed and implemented three kinds of recommendation algorithms based on big data framework in this paper. Besides, we improved the traditional recommendation algorithms leveraging the prevailing big data processing technologies. Finally, we evaluated the efficiency of the algorithm through recall rate, precision rate and coverage. Experiments show that the hybrid model-based recommendation algorithms which can be applied to the bulk data environment are better than the single recommendation algorithms.
Analysis of the electrostatic field distribution in the hemispherical internal cell of radon monitors to estimate the collection efficiency of Po-218
Authors: Fan Z. , Xie L. , Mo Y. , Lin F. , Hu T. , Yuan H. , Tan Y.
Published: December 2021

The collection efficiency of the hemispherical internal cell of radon monitors depends on many factors, with the distribution of the electric field and the relative humidity of the air being particularly important. COMSOL is used to simulate an internal cell with a plastic upper surface. Simulation results show a relatively uniform gradient of the electric field. Assuming that the electric field felt by the positively charged Po-218 ions in the internal cell is a linear function of its radial coordinate, a mathematical model of the collection efficiency is proposed. From this model, we obtained the following: 1) under the same neutralization rate and potential, the electric field gradient has little effect on the collection efficiency; 2) under the same neutralization rate, the collection efficiency increases with the potential on the cell wall. If the neutralization rate is small, then the potential value for the maximum collection efficiency is also small. At a relative humidity of 6%–10%, the collection efficiency saturates for values of the electric potential on the cell wall larger than 5 kV; 3) under the same potential, a large neutralization rate corresponds to reduced collection efficiency. At high potential, the collection efficiency is relatively less affected by the neutralization rate. Higher collection efficiency can be achieved under high potential and low humidity conditions. This study provides a theoretical foundation to design the internal cell of radon monitor for improving the collection efficiency of Po-218.
On the optimality of optical pumping for a closed Λ-system with large decay rates of the intermediate excited state
Authors: Stefanatos Dionisis , Paspalakis Emmanuel
Published: December 2021

We use optimal control theory to show that for a closed Λ-system where the excited intermediate level decays to the lower levels with a common large rate, the optimal scheme for population transfer between the lower levels is actually optical pumping. In order to obtain this result we exploit the large decay rate to eliminate adiabatically the weakly coupled excited state, then perform a transformation to the basis comprised of the dark and bright states, and finally apply optimal control to this transformed system. Subsequently, we confirm the optimality of the optical pumping scheme for the original closed Λ-system using numerical optimal control. We also demonstrate numerically that optical pumping remains optimal when the decay rate to the target state is larger than that to the initial state or the two rates are not very different from each other. The present work is expected to find application in various tasks of quantum information processing, where such systems are encountered.
Sustainability evaluation of the solid waste management system in Makassar City
Authors: Azis A C B , Munir A , Zubair H
Published: December 2021

The many impacts of improper solid waste management have made every region run a solid waste management system (SWMS) in a sustainable manner. It is necessary to evaluate it using the appropriate indicators to assess the sustainability of a SWMS. This study uses a sustainability indicator consisting of 27 indicators divided into six groups, which are suitable for assessing the sustainability of SWMS. This study found that the SWMS condition in Makassar City was still far from being sustainable. The results found that SWMS in Makassar City scored 58% in the general group, 95% in the collection and sorting group, 57% in the recycling group, 20% in the composting group, 20% in the energy recovery group, and 24% in the landfill group.
The Utilization of Land Surface Temperature Information as an Input for Coastal City
Authors: Ardiyansyah A , Munir A , Gabric A
Published: December 2021

Numerous studies have shown that there is a positive correlation between the increase of urban built-up areas with elevated Surface Urban Heat Island (UHI) temperature. It can be considered that SUHI is a by-product of urbanisation. The study found that SUHI in Makassar City is seasonal dependent. High surface temperature tends to occur in the dry season within the urban centre, expanding to the South-Eastern. Furthermore, by combining land surface temperature and Local Climate Zone (LCZ) classification scheme, 16 out of 17 local climate zones were identified, excluding LCZ 7 (light built) within the observation year. In detailed, the combination of LCZ 3 class (compact low rise) and LCZ 10 class (industrial), occupied more than 80 % of the total built-up category with a surface temperature range of 11° C and 16° C respectively. Furthermore, the result indicates a homogenous surface temperature within LCZ 3 with a lower SD of 1.40° C compared to LCZ 10 of 1.95° C. Also, the study explored the correlation of various urban and non-urban indices using artificial neural network. Based on the model used, the indices showed poor correlation with LCZ 3 but adversely correlates to LCZ 10. A final loss value of 0.222 in LCZ 10 was obtained. In contrast, LCZ 3 resulted in high final loss value of 146.554. The result indicated that there are other variables which should be considered in exploring SUHI correlation within LCZ 3 (compact low rise) in Makassar City. In contrast, LCZ 10 (industrial) correlate positively with three urban indices, consisting of NDBI (43.94), BI (37.79), and NDBal (34.77). In brief, the result indicated that SUHI phenomenon in LCZ 3 was poorly represented by the model, whereas the level of city development can be predicted better using LCZ 10 (industrial) areas.
Stability analysis of two predators and one prey population model with harvesting in fisheries management
Authors: Didiharyono D , Toaha S , Kusuma J , Kasbawati
Published: December 2021

The discussion is focussed in the interaction between two predators and one prey population model in fishery management. Mathematically model is built by involving harvesting with constant efforts in the two predators and one prey populations. The positive equilibrium point of the model is analyzed via linearization and Routh-Hurwitz stability criteria. From the analysis, there exists a certain condition that makes the positive equilibrium point is asymptotically stable. The stable equilibrium point is then related to the maximum profit problem. With suitable value of harvesting efforts, the maximum profit is reached and the predator and prey populations remain stable. Finally, a numerical simulation is carried out to find out how much the maximum profit is obtained and to visualize how the trajectories of predator and prey tend to the stable equilibrium point.
Resilience Level of Highland and Smallholder Farmers in Developing Various Coping-Based Agroforestry in the Upstream Minraleng Sub-Watershed, Maros District
Authors: Dassir M , Samuel AP , Usman A , Nadirah S
Published: December 2021

Farmers’ households in upstream watersheds in Indonesia experience crop failure in their business cultivation as a result of climate change. The aim of this study, knowing the level of farmer resilience in various agroforestry systems of mixed gardens – talun developed in various agroforestry systems of mixed gardens – talun developed on the highlands in the upstream Minraleng sub-watershed. Data collection was carried out through observation and interviews with farmer household respondents. The results showed that farmer households developed an intercropping agroforestry system of teak and corn in the first phase (1-4 years) and mixed plantations of bananas, cacao and papaya in the second phase (4-15 years), and continued with mixed plantations dominated by teak, have a higher adaptive capacity and levels of resilience to climate change. This is because it has more diversity of plants and a variety of livelihoods, and has the power of mutual association between plants in dealing with drought.
Analysis on the value of stiffness of the dual joint straightness notch joint of beams due to cyclic lateral load
Authors: Nur M R , Parung H , Amiruddin A A
Published: December 2021

Precast concrete is an answer to the demands of building structures that save time, but cannot be used widely because of the reliability of the connection, especially during an earthquake, the desired earthquake-resistant building structure must have sufficient strength and rigidity. Stiffness is one of the factors that determine the response of a structure to earthquake loads. When connected with earthquake loads, a structure must have sufficient rigidity so that its movement during an earthquake can be limited. This study aims to determine and analyze the stiffness in the double columns straight joint beam notches due to lateral cyclic load. By dividing 3 (three) types of test specimens, namely Monolithic column Beam, Type 1 Column Joint (SBK), and Type 2 Column Beam Joint (SBK). The connection used is a double straight notch and using the grouting method. Testing and analysis using the Displacement Control Method with the European Convention for Constructional Steelwork (ECCS) 1986 standards. The results showed the monolith column Column (BK) specimens have a greater stiffness value compared to SBK 1 specimens and SBK 2 specimens.
Land suitability analysis for urban development using multihazard map in mamuju district, West Sulawesi province, Indonesia
Authors: Anastasia S , Alimuddin I , Arifin F
Published: December 2021

In urban development, land suitability assessment is very important to be considered by urban planners and policymakers for designing urban spatial planning. Assessment of the suitability of urban planning using a multi-hazard map is made to provide an overview of potential natural hazards that pose a threat to regional development so that the government can avoid urban development in areas prone to natural hazards or implementing urban development based on disaster mitigation. The research area is Mamuju Regency which is the capital city of West Sulawesi province which is an area that has frequently suffered damages due to floods, landslides, and earthquakes. The main scope of this research is to synthesize natural hazard maps in one multi-hazard map and thus identify suitable areas for urban development using the Analytical Hierarchy Process (AHP) method and utilize Geographical Information Systems (GIS). The results showed that the Mamuju area was mostly at moderate to high suitability.
Biomarker Characterization of Oil Seepages in Tomori Basin, Central Sulawesi, Indonesia
Authors: Burhanuddin M S , Jaya A , Maulana A
Published: December 2021

Tomori Basin is located close to the Banggai Basin which has several productive oil fields. Further investigation of the hydrocarbon potential in Tomori Basin is an important issue as potential hydrocarbon resources are indicated by the discovery of several oil seepages in the area. This study identified Tomori Basin oil seepage characteristics using a biomarker analysis approach. The Wosu and Kolo Areas were the main objectives of this study. Oil seepage characteristics were determined using Gas Chromatography (GC) and Gas Chromatography-Mass Spectrometry (GC-MS) methods to generate biomarker data which could be analysed to identify organic matter origin, oxic and anoxic conditions, source facies, or depositional environment. Based on the GC analysis of is oprenoids, the Pristane C19/Phytane C20 ratio (Pr/Ph) of Wosu Oil was 0.75, indicating anoxic conditions typical of a hypersaline environment. Kolo Oil had a Pr/Ph ratio of 3.37 indicative of terrestrial organic input under oxic conditions. A cross plot between Pristane/nC17 and Pr/Ph ratios indicates that Wosu Oil derives from a highly anoxic environment with algae/bacterial organic matter input whereas Kolo Oil derives from a suboxic-oxic environment dominated by terrestrial organic matter input. Trycyclic terpene analysis from C19 to C25 shows Wosu Oil seepages tend to originate from an environment of mixed terrestrial and marine organic matter (transitional environment). Overall, biomarker characteristics indicate that Wosu Oil originated from organic matter in a hypersaline and anoxic environment, whereas Kolo Oil originated from terrestrial matter in a suboxic – oxic environment.
Role of bedrock serpentinization on the development of nickel laterite deposit in Sorowako, Sulawesi, Indonesia
Authors: Irfan U R , Maulana A. , Muhammad F
Published: December 2021

The objective of this research is to analyze the role of bedrock serpentinization on the development of Ni-Laterite deposits in Sorowako, Sulawesi Island, Indonesia. Samples were obtained from coring data in three areas, namely the West Block, East Block, and Petea, which are subject to mineralogical and geochemical analyses. Petrography of the bedrocks was conducted to analyze the mineral composition, texture, and serpentinization degree, and later correlated with the distribution of geochemical elements from X-ray fluorescence method in each laterite zone. The bedrock in the West Block is dunite which consists of predominantly olivine with low degree serpentinization. The bedrock in the East Blocks and Petea consists of peridotite in the form of lherzolite and harzburgite which have been moderate to highly serpentinized. The distribution of elements in each block shows that MgO, SiO2, and Ca elements significantly decrease towards the upper laterite profile while Fe, Al, and Cr are enriched in the limonite zone and Ni, Mn, and Co are significantly enriched in the saprolite zone. Ni, Fe, SiO2, Cr, MgO, and Mn in the West Block are relatively higher than the East Block and Petea. This study shows that Ni content is relatively higher in West Block compare to East Block and Petea in averages of 1.7%, 1.53%, and 1.3%, respectively. Olivine-rich bedrock and a low degree of serpentinization resulted in high-Ni concentration in the laterite profile, particularly in the saprolite layer. This means that bedrock characteristics and degree of serpentinization were responsible for the development of nickel.
Provisions for seismic detailing of column-beam connections according to SNI 2847:2019
Authors: Tumengkol H , Irmawaty R , Parung dan H , Amiruddin A
Published: December 2021

This research discusses seismic detailing for column-beam connections based on the special moment-hoe frame system (SPRMK) stipulated in the concrete regulations of SNI 2847:2019. Exterior-type column-beam connections with beam sizes of 200 mm × 300 mm and column sizes of 300 mm × 300 mm. The beam span is 1450 mm and the column height is 2850 mm. The reinforcement used in the beam diameter D13 as much as 6 pieces with a barge diameter of 8 mm. In the column, the main reinforcement diameter is D16 as much as 8 pieces with a barge reinforcement diameter of 8 mm with a distance of 75 mm. The detailing provisions are based on SNI 2847:2019 specifically in article 18.6, article 18.7, and article 18.8. Based on this provision obtained for detailing the connection of the column including blocks, columns, and joints meet the requirements specified in SNI 2847:2019.
Geology and hydrothermal alteration of Tambulun Cu-Au skarn prospect in Sulit Air area, Solok district, West Sumatra province, Indonesia
Authors: Afrilita  , Idrus A , Warmada I W
Published: December 2021

Study area is located at Tambulun copper-gold skarn prospect and its vicinity in Sulit Air area, Solok district, West Sumatra, Indonesia. The prospect has been known for a long time, however, detailed study on alteration and ore mineralization characteristics is not done yet. This study, therefore, is dealing with geological framework and characteritics of mineralogy, and geochemistry of the skarn prospect. Surface geological and alteration mapping as well as various laboratory analyses including petrography, ore microscopy, FA-AAS and ICP-MS of selected samples taken were performed. Skarn alteration and mineralization mostly occurs along the contact between Triassic crytalline limestone of Tuhur Formation and Jurassic granodiorite of Sulit Air granitoid suite. Ore mineralization is structurally controlled by WNW-ESE dextral slip-fault and NE-SW, N-S sinistral slip faults. Skarn alteration is zoned upon intrusions from proximal to distal consisting of garnet-pyroxene, pyroxene-garnet and chlorite-epidote zones. Silicified (quartz-clinopyroxene) alteration is also locally observed. Copper bearing sulfides such as bornite and chalcopyrite as well as supergene products such as chalcocite, covellite, chrysocolla, azurite and malachite are intimately associated with proximal garnet-pyroxene zone. Ore mineralization shows elevated grades of 20.9% Cu, 8.02 g/t Au and 573 g/t Ag, respectively, and they show a positive correlation. Those preliminary data exhibit that the skarn prospect seems to be promising to be followed-up for the next-step systematic exploration.
Analysis of the human development index to the development of the province of west Sulawesi
Authors: Ansyar M. H. , Padjung R. , Salam M.
Published: December 2021

Development success is measured by several parameters, one of which is the human development index. Humans have a role as a factor of production which is very important in the development of the region. This study aims to analyze which components make the human development index in the province of West Sulawesi low, and how the government’s strategies and priorities in improving HDI to support regional development and development. The analytical method used is multiple linear regression with SPSS software. The results of this study indicate that health and education have a significant positive effect on the development of the province of West Sulawesi while the economic component does not affect the human development index.
Dynamic Strategy and Contingency Power of SMEs Fish Processing Units In Achieving Sustainability Levels (Case Study: SMEs of Boneless Milkfish Processing Units in Pinrang Regency, Indonesia)
Authors: Karim M , Salman D , Genisa J , Rahmadanih
Published: December 2021

Increased competition has demanded the adaptation of SMEs to environmental changes and challenges for the success of companies in Indonesia. The purpose of this study is to analyze the strategy and contingency power of SMEs of fish processing units in reaching the level of sustainability. The object of the research is the SMEs of fish processing units in Pinrang Regency, South Sulawesi. This type of research is qualitative, which is descriptive by using case study techniques. Data collection techniques through field observations, in-depth interviews, and related documents. The results of this study indicate that the sustainability level of SMEs of the boneless milkfish processing unit in Pinrang Regency is proactive towards the continuity of production, continuity of sales, and continuity of raw material procurement. The sustainability of SMEs of fish processing units is shown by its ability to surf in chaotic dynamics. SMEs of fish processing units which have a high level of sustainability has been able to build an input process-output system dynamically so that it has contingency power and appropriate strategies in dealing with environmental dynamics. The contributing factor to the unsustainability of SMEs of fish processing units is the low ability to; build systems to be able to establish contingencies with the external environment. To improve and maintain its level of sustainability, the SMEs of fish processing units are improving the input-process-output system dynamically, optimizing contingency power with the task environment as well as with the political, economic, social, cultural, technological and natural environment.
The Effect of Soil Chemicals on Cocoa Productivity in West Sulawesi
Authors: Baja S , Harli  , Asrul L , Padjung R , Neswati R.
Published: December 2021

As Indonesia is one of the largest cocoa producing countries in the world, cocoa plays an important role in the Indonesian economy. However, cocoa bean production has continued to decline since 2012 in several cocoa producing regions in Indonesia, including West Sulawesi. The main problem for cocoa in Indonesia is the low productivity of the plants. The average productivity of cacao cocoa plants in West Sulawesi in 2019 was only 797 kg/ha/year. The productivity of the cocoa plants can reach 2,000-3,000 kg/ha/year. One of the causes of the low cocoa plant productivity of their cocoa plant is the mismatch between plant needs of and with soil chemical properties. This study uses quantitative methods with a deductive approach. Theis research took place in four districts in West Sulawesi, namely : Polewali Mandar, Majene, Mamasa and Mamuju Regencies. The determination of the 30 sampling point stations to provide representative profiles was based on cocoa productivity data. The results showed that there was a significant correlation between cation exchange capacity (CEC) and cocoa productivity. The amount abundance of exchangeable bases cations (Ca+, Ma+ and K+) hads a significant effect on cocoa plants in the high productivity category . There was a negative correlation between salinity for and cocoa plant productivity in the high (1500-2500 kg/ha/year) and low (<800kg/ha/year) productivity categories productivity category (1500-2500 kg / ha / year. Higher salinity causes lower productivity of cocoa plants. Likewise in the low productivity category (<800kg/ha/year). There was no correlation between pH H2OH2O pH with and cocoa productivity at all the representative profile points stations. There was a positive correlation between pH H2O pH and four other soil chemical characteristics, namely: C-Organic carbon, salinity, base saturation and the abundance of the number of exchangeable base cations can be exchanged.
A petrographic study of bauxite of Kenco area, Landak District, West Kalimantan Province
Authors: Nurhawaisyah S R , Jafar N , Bakri S , Artiningsih A , Widodo S
Published: December 2021

Lateritic bauxite are the products of intense weathering of rocks. It is largely controlled by bedrock type, time, climate (rainfall), and geomorphology. It is located in Kenco area, Landak district, West Kalimantan Province which the rest of the development of Cretaceous volcanism consisting of the island of Borneo Volcanic Formations Mensibau with unit members Granodiorite, quartz diorite and diorite, and the Formation of the Kingdom Volcanic Andesite-trachite units and Formations of alluvium and swamp sediment quarter. Bauxite deposits of Kenco area in Landak are investigated to determine the characteristics of rocks using petrographic analysis. Petrographic analysis aims to determine mineral content and type of source rock based on Travis classification (1955). The results of 15 thin sections showed that aluminum-bearing minerals consisted of orthoclase, plagioclase, and biotite which are the type of source rock are granodiorite, granodiorite porphyry, gabbro porphyry, and basalt porphyry based on Travis classification (1955).