bluuebunny/crossref_metadata_2025 huggingface dataset:
Voltage profile analysis at planning and operational stages with allowable PV hosting capacity
Authors: Yadav Anju , Kishor Nand , Negi Richa
Published: November 2023

High level of photovoltaic (PV) integration into the distribution network (DN) may have a negative impact in terms of voltage variations across the limits. As such thorough analysis is required to ensure voltage within limits, mainly at feeder‐end buses. In this study, the PV integration problem is addressed in a more comprehensive way, considering the unbalance DN, impedance characteristic, and interaction of load against available PV output. The approach applies to both the planning and operational stage in the assessment of allowable PV hosting capacity (HC). In the planning stage, the local impedance index is computed at constant load and power factor conditions. The entire network is partitioned into areas and the most suitable area for PV integration is determined, which can allow maximum PV integration, without/minimum voltage violations. In the operation stage for allowable PV hosting capacity, further voltage analysis is performed, wherein peakness of PV output and load conditions do not match each other. Towards, voltage regulation via PV inverter, the power factor profile is adjusted as a function of PV output. The study is demonstrated for transient solar radiation, with emphasis on maintaining the voltage at feeder‐end buses. The simulation is carried out on interfacing GridPV in MATLAB and OpenDSS toolbox. The proposed scheme for allowable HC and further voltage regulation in the network using PV inverter is also compared with those approaches, applying optimised and centralised placement of PVs.
Nitric oxide transport in carotid bifurcation after different stent interventions: a numerical study
Authors: Fan Zhenmin , Yao Jialiang , Xu Jianda , Liu Xiao , Liu Mingyuan , Ye Xia , Deng Xiaoyan
Published: November 2023

Stent restenosis and late thrombosis compromise endovascular stent implantation clinical benefit, and the mechanism is unclear. Since nitric oxide (NO) plays a pivotal role in maintaining vascular homeostasis, we believe that stenting can affect NO concentration in the host artery, thereby contributing to postoperative adverse events. We numerically investigated NO concentration after stenting based on the patient-specific carotid to verify this hypothesis. The simulation revealed that stent implantation caused blood flow disturbance, a low wall shear stress, and a significant decrease in NO on the luminal surface, especially in the region of the stented segment. Moreover, severe damage to the artery wall or low blood flow, leading to a low NO generation rate, would induce relatively low NO level in the stented segment. Additionally, we demonstrated that NO distribution might be affected by the combination of stent struts and carotid bifurcation geometry, while the host arterial configuration might play a leading role in the distribution of NO concentration. In conclusion, the carotid artery had a relatively low NO concentration level near stent struts, especially at the severely injured artery, low blood flow, long stenting, and complex host artery which might lead to a genesis/development of adverse events after that intervention.
Optimization of multi-period investment planning in street lighting systems by mixed-integer linear programming
Authors: Rodríguez Cristhian C. , Romero Quete Andrés A. , Suvire Gastón O. , Rivera Sergio R.
Published: November 2023

This article proposed the use of multi-period mixed-integer linear programming method for investment planning to support decision-making processes in upgrading and managing street lighting systems. The technique incorporates a multi-variate model that maximizes energy-saving by considering budget constraints, the state of the lighting system, and the available technology in the market to replace the existing streetlights. This topic is novel because the complexity of the problem relies on the existence of several potentially large investments. As explained in this paper, the proposed method optimally considers the investments and returns as a combination that maximizes energy savings. The method was tested using actual data from an undisclosed public lighting system in Colombia. The results obtained revealed that multi-period investment optimization based on mixed-integer linear programming is an ideal investment plan, particularly in streetlight systems. Therefore, it forms an invaluable tool for street lighting systems' administrators and decision-makers in optimizing and facilitating the critical decision-making process in their work environment.
Improved clustering algorithm for personal privacy and security protection of elderly consumers
Authors: Jiang Pengfei
Published: November 2023

With the advancement of technology, there is an increasing emphasis on the personal privacy and security of elderly consumers. This article focuses on the personal privacy and security protection of elderly consumers. Based on the K-means (KM) clustering algorithm, the optimal value was obtained using the monarch butterfly optimization (MBO) algorithm. The migration operator and adjustment operator of the MBO algorithm were enhanced using differential variation algorithm and adaptive methods to obtain a modified monarch butterfly optimization (MMBO) algorithm. Then, to ensure secure protection during clustering, differential privacy (DP) was employed to add noise perturbation to data to obtained a method called DPMMBO-KM algorithm. In experiments on the UCI dataset, it was found that the MMBO-KM algorithm had better clustering performance. Taking the Iris dataset as an example, the MMBO-KM algorithm achieved the highest accuracy of 93.21%. In the application to recommendation systems, the DPMMBO-KM algorithm achieved higher F1 values under different privacy budgets; the average was 0.06. The results demonstrate that the improved clustering algorithm designed in this article can improve clustering results while ensuring personal privacy and data security, and also perform well in recommendation systems.
Differenzierung struktureller Herzerkrankungen in der
MRT
Authors: Hoche Barbara , Schuck Linus
Published: November 2023

Strukturelle Herzerkrankungen umfassen erworbene oder angeborene
Veränderungen, die mit einer Modifizierung der Herzklappen und des
Herzmuskels einhergehen. Eine Verdickung des Herzmuskels gibt indirekte Hinweise
für eine vergrößerte interstitielle Matrix,
d. h., dass sich im Extrazellulärraum pathologische
Stoffwechselabbauprodukte angesammelt haben und diese funktionelle Defizite in
der Kontraktion des Herzmuskels verursachen können.
Elternpräsenz statt Suchtpräsenz – das Elterncoaching
Authors: Räbiger-Stratmann Hans
Published: November 2023

Wie können Eltern auf einen Rauschmittelkonsum von Jugendlichen reagieren? Im Folgenden wird ein Elterncoaching dargestellt, welches Erkenntnisse aus der Systemtheorie nutzt und Eltern neue kommunikative Möglichkeiten vermittelt, um sich für die Konsumfreiheit ihrer Kinder einzusetzen. Eine Auswahl der wirksamen Interventionen lässt sich auf andere Angehörige von Konsumenten übertragen.
Sucht – Informationen im Internet
Authors: Hylla Karoline
Published: November 2023

Sucht ist eine der häufigsten psychischen Erkrankungen in Deutschland und dennoch suchen nur vergleichsweise wenige Menschen Hilfe für ihre Probleme. Das Internet bietet niedrigschwellige Informationsmöglichkeiten. So findet man ein großes Angebot für unterschiedliche Substanzen, vor allem für Alkohol, und Informationen für Betroffene, Angehörige und Helfende. Auch ein breites Angebot an Selbsthilfegruppen kann im Internet gefunden werden.
Fallbericht Zwanghafte Persönlichkeitsstörung
Authors: Dieterich Leander , Trösken Anne , Wagner Elisabeth , Deutschmann Ulrich
Published: November 2023

Ein 53-jähriger Beamter stellt sich nach Wiederauftreten depressiver Beschwerden auf Anraten der Hausärztin vor. Das Gespräch erweist sich jedoch als schwierig, weil der ängstliche und kontrollierende Patient den Therapeuten ständig unterbricht.
Distanzieren statt dissoziieren – Abstandshalter und Verfremdungen zur Reduzierung dissoziativer Prozesse
Authors: Hantke Lydia
Published: November 2023

Dissoziation ist die automatisierte Antwort unseres Geist-Körper-Zusammenhangs auf emotionale Überlastung. Wer sich aktiv distanziert, reduziert die Notwendigkeit dissoziativer Reaktionen. Dabei sind Abstandhalter einfach anzuwenden und ein wichtiges Werkzeug zur Herstellung von Kontrolle und Selbstwirksamkeit.
Editorial
Authors: Becker Claus
Published: November 2023

Liebe Kolleginnen und Kollegen,

Fort- und Weiterbildung sind zentrale Themen im Leben und im Beruf. Auch - oder
gerade wegen - unserer neuen Berufsbezeichnung „Medizinische Technologinnen
und Technologen für Radiologie“ ist die Verantwortung und die
Erwartungen an uns gestiegen.
Risk tolerance in youth with emerging mood disorders
Authors: Weinrabe Angé , Tran James , Hickie Ian B.
Published: November 2023

Reward-seeking behavior drives adolescents toward risky decision-making. As compared to their older and younger peers, adolescents experience higher rates of anxiety and depressive disorders, leading to impaired decision-making with negative consequences. At two time points, separated by 6–8 weeks, we measured risky and ambiguous choices concurrently with levels of dysregulated emotion for youth aged 16–25 (N = 30, mean age 19.22 years, 19 males) attending a youth mental health clinic. The Kessler Psychological Distress Scale (10 items) (K10), the Quick Inventory of Depressive Symptomatology Adolescent (17 items) (QIDS-A17) specifically designed for youth, and the Somatic and Psychological Health Report (12 items) (SPHERE-12) questionnaires were used to evaluate participant’s self-reported anxiety and depression scores. Risk and ambiguity tolerance was calculated at the individual and group level. At baseline, 25 (83%) participants were rated as experiencing a mental health condition, and 15 (50%) rated high on all three psychological questionnaires combined, scoring “severely” depressed and “severely” anxious. At follow-up, 25 returning participants, 80% (N = 20) remained distressed, with 11 continuing to rate high on all psychological scores. In Session 1, participants had a mean of approximately 14 risky choices (SD = 4.6), and 11 ambiguous choices (SD = 7.6), whilst in Session 2, participants’ mean equated to approximately 13 ambiguous choices (SD = 8.5), but their risk increased to 15 choices (SD = 6.5). Applying a multiple regression analysis at the group level, the data suggests that participants were risk averse (α = 0.55, SE = 0.05), and preferred making ambiguous choices (β = 0.25, SE = 0.04). These results suggest that high trait-like anxiety in youth is associated with risk intolerance. These findings may have implications for screening young people with emerging mood disorders.
Spatial distribution characteristics and influencing factors of traditional villages in Fujian Province, China
Authors: Ma Yan , Zhang Qilin , Huang Liyun
Published: November 2023

As the historical and contemporary values of Chinese traditional villages continue to emerge and the circumstances of the times change, their preservation has a lasting and far-reaching significance in promoting the revitalisation and sustainable development of China’s countryside. However, rapid urbanization began after China’s reform and opening up, and continuous urban expansion led to the rapid decline or even disappearance of these villages. Previous studies on village protection tend to focus on morphological studies from the perspective of individual units, and rarely discuss the influencing factors of spatial distribution. Therefore, there are certain deficiencies in revealing the distribution rules, which makes it difficult to fully carry out the protection work. The article reconstructs the traditional village system of Fujian Province, whose traditional villages cover both national and provincial historical and cultural villages and national and provincial traditional villages. The spatial distribution characteristics and influencing factors of traditional villages in Fujian Province were studied using 1,606 traditional villages of various levels as research objects. The results of the study show that: (1) the spatial distribution of traditional villages in Fujian Province is cohesive, with significant uneven distribution, and there are three high-density agglomerations and two sub-density agglomerations; (2) The spatial distribution shows a pattern of “large scattering, small concentration, more in mountainous areas and less in coastal areas”; (3) Topography, river systems, transportation and socio-economic conditions combine to influence the spatial distribution of traditional villages in Fujian Province, but the degree of influence varies. Physical and geographical conditions play a leading role in the distribution of traditional villages, and road traffic conditions and socio-economic conditions have a secondary impact on the distribution of traditional villages. There is an obvious agglomeration of traditional villages in the mountainous river areas, while there is a certain degree of negative correlation between road traffic conditions and socio-economic conditions and the number of traditional villages. (4) With the support of good policies and economic conditions, the protection and continuation of traditional villages can be promoted to a certain extent, and it is also conducive to the spread of local multicultural culture. Finally, corresponding policy recommendations are made for the conservation and sustainable development of traditional villages in Fujian Province.
The monetary policy pass-through mechanism: Is the search-for-yield incentive at work?
Authors: Huynh Japan
Published: November 2023

The paper investigates the possible mechanism behind the link between monetary policy and bank lending/risk-taking behaviors. Using a sample of Vietnamese commercial banks during 2007–2019, we find that the impact on bank output associated with monetary policy shocks is attributable to banks’ incentives to search for yield. Concretely, if interest rates remain lower amid monetary expansions, banks are likely to expand their lending activities more aggressively and take more risks to offset their reduced revenues. Moreover, this crucial supply-side effect is also at work for the bank liquidity creation channel of monetary policy transmission. Accordingly, we document that demotivated banks appear to undermine the impact of monetary policy on the core function of banks in creating liquidity to the real economy. Our finding is robust against a series of alternative monetary policy indicators, different bank output measures, multiple search-for-yield proxies, and substitute econometric methodologies. In sum, as the monetary policy pass-through transmission through the key banking channels is found due to banks’ own decisions, monetary authorities need to take this underlying mechanism into account when setting their monetary policy.
Hydroxypyridinate-bridged paddlewheel-type dirhodium complex as a catalyst for photochemical and electrochemical hydrogen evolution
Authors: Kataoka Yusuke , Sato Kozo , Yano Natsumi
Published: November 2023

Electrochemical and photochemical hydrogen (H2) evolution activities of a 6-fluoro-2-hydroxypyridinate (fhp−)-bridged paddlewheel-type dirhodium (Rh2) complex, [Rh2(fhp)4], were investigated through experimental and theoretical approaches. In DMF, the [Rh2(fhp)4] underwent a one-electron reduction (assigned to Rh24+/3+) at −1.31 V vs SCE in the cathodic region. Adding trifluoroacetic acid as a proton source to the electrochemical cell containing [Rh2(fhp)4], the significant catalytic current, i.e., electrochemical H2 evolution, was observed; the turnover frequency and overpotential of electrochemical H2 evolution were 18 244 s−1 and 732 mV, respectively. The reaction mechanism of electrochemical H2 evolution catalyzed by [Rh2(fhp)4] in DMF was examined in detail by theoretically predicting the redox potentials and pKa values of the reaction intermediates using density functional theory calculations. The calculations revealed that (i) the formation of a one-electron reduced species, [Rh2(fhp)4]−, triggered for H2 evolution and (ii) the protonation and reduction processes of [Rh2(fhp)4]− to further reduced hydride intermediates proceeded directly via a concerted proton–electron transfer mechanism. Moreover, [Rh2(fhp)4] was shown to be a highly efficient H2 evolution catalyst (HEC) for photochemical proton reduction reactions when combined with an artificial photosynthetic (AP) system containing [Ir(ppy)2(dtbbpy)]PF6 and triethylamine, which served as a photosensitizer and a sacrificial electron donor, respectively. Under visible light irradiation, the total amount of H2 evolved and its turnover number (per Rh ion) were 1361.0 µmol and 13 610, respectively, which are superior to those of previously reported AP systems with rhodium complexes as HEC.
A molecular mechanism for the “digital” response of p53 to stress
Authors: Safieh Jessy , Chazan Ariel , Saleem Hanna , Vyas Pratik , Danin-Poleg Yael , Ron Dina , Haran Tali E.
Published: November 2023

The tumor suppressor protein p53 accumulates in response to cellular stress and consequently orchestrates the expression of multiple genes in a p53-level and time-dependent manner to overcome stress consequences, for which a molecular mechanism is currently unknown. Previously, we reported that DNA torsional flexibility distinguishes among p53 response elements (REs) and that transactivation at basal p53 levels is correlated with p53 REs flexibility. Here, we calculated the flexibility of ~200 p53 REs. By connecting functional outcomes of p53-target genes’ activation to the calculated flexibility of their REs, we show that genes known to belong to pathways that are activated rapidly upon stress contain REs that are significantly more flexible relative to REs of genes known to be involved in pathways that are activated later in the response to stress. The global structural properties of several p53 REs belonging to different pathways were experimentally validated. Additionally, reporter-gene expression driven by flexible p53 REs occurred at lower p53 levels and with faster rates than expression from rigid REs. Furthermore, analysis of published endogenous mRNA levels of p53-target genes as a function of REs’ flexibility showed that early versus late genes differ significantly in their flexibility properties of their REs and that highly flexible p53 REs enable high-activation level exclusively to early-response genes. Overall, we demonstrate that DNA flexibility of p53 REs contributes significantly to functional selectivity in the p53 system by facilitating the initial steps of p53-dependent target-genes expression, thereby contributing to survival versus death decisions in the p53 system.
Dominant heterocyclic composition of dissolved organic nitrogen in the ocean: A new paradigm for cycling and persistence
Authors: Broek Taylor A. B. , McCarthy Matthew D. , Ianiri Hope L. , Vaughn John S. , Mason Harris E. , Knapp Angela N.
Published: November 2023

Marine dissolved organic nitrogen (DON) is one of the planet’s largest reservoirs of fixed N, which persists even in the N-limited oligotrophic surface ocean. The vast majority of the ocean’s total DON reservoir is refractory (RDON), primarily composed of low molecular weight (LMW) compounds in the subsurface and deep sea. However, the composition of this major N pool, as well as the reasons for its accumulation and persistence, are not understood. Past characterization of the analytically more tractable, but quantitatively minor, high molecular weight (HMW) DON fraction revealed a functionally simple amide-dominated composition. While extensive work in the past two decades has revealed enormous complexity and structural diversity in LMW dissolved organic carbon, no efforts have specifically targeted LMW nitrogenous molecules. Here, we report the first coupled isotopic and solid-state NMR structural analysis of LMW DON isolated throughout the water column in two ocean basins. Together these results provide a first view into the composition, potential sources, and cycling of this dominant portion of marine DON. Our data indicate that RDON is dominated by
15
N-depleted heterocyclic-N structures, entirely distinct from previously characterized HMW material. This fundamentally new view of marine DON composition suggests an important structural control for RDON accumulation and persistence in the ocean. The mechanisms of production, cycling, and removal of these heterocyclic-N-containing compounds now represents a central challenge in our understanding of the ocean’s DON reservoir.
Sharing names and information: Incidental similarities between CEOs and analysts can lead to favoritism in information disclosure
Authors: Even-Tov Omri , Huang Kanyuan , Trueman Brett , Bogard Jonathan E. , Goldstein Noah J.
Published: November 2023

When two people coincidentally have something in common (such as a name or birthday), they tend to like each other more and are thus more likely to offer help and comply with requests. This dynamic can have important legal and ethical consequences whenever these incidental similarities give rise to unfair favoritism. Using a large-scale, longitudinal natural experiment, covering nearly 200,000 annual earnings forecasts over more than 25 y, we show that when a CEO and a securities analyst share a first name, the analyst’s financial forecast is more accurate. We offer evidence that name matching improves forecast accuracy due to CEOs privately sharing pertinent information with name-matched analysts. Additionally, we show that this effect is especially pronounced among CEO−analyst pairs who share an uncommon first name. Our research thus demonstrates how incidental similarities can give way to special treatment. Whereas most investigations of the effects of similarity consider only one-shot interactions, we use a longitudinal dataset to show that the effect of name matching diminishes over time with more interactions between CEOs and analysts. We also point to the findings of an experiment suggesting that favoritism born of sharing a name may evade straightforward regulation in part due to people’s perception that name similarity would exert little influence on them. Taken together, our work offers insight into when private disclosures are likely to be made. Our results suggest that the effectiveness of regulatory policies can be significantly impacted by psychological factors shaping the context in which they are implemented.
Multi-Pseudo Peakons in the b-Family Fifth-Order Camassa–Holm Model
Authors: Zhu 朱 Dinghao 鼎浩 , Zhu 朱 Xiaodong 晓东
Published: November 2023

The b-family fifth-order Camassa–Holm model is a nontrivial extension of the celebrated Camassa–Holm model. This work investigates single-pseudo and multi-pseudo peakon solutions of this model via analytical calculations and numerical simulations. Some intriguing phenomena of multi-pseudo peakon which do not appear in the classical Camassa–Holm model interactions are observed, such as two-pseudo peakon collapses, three-pseudo peakon resonance, and multi-pseudo peakon inelastic collisions. The present work will inspire further studies on the higher-dimensional integrable Camassa–Holm systems which may have high value in investigating the related higher-dimensional physical problems.
Numerical simulation of solar cell performance with copper-based layered perovskite using SCAPS-1D software
Authors: Thankappan Aparna
Published: November 2023

Perovskite solar cells (PSCs) have garnered extensive research interest due to their potential for efficient, flexible, and cost-effective solar energy production, making them suitable for wearable and low-cost applications. In this study, we successfully synthesized layered copper-based perovskite materials, and subsequently conducted simulations using the Solar Cell Capacitance Simulator SCAPS-1D. This study introduces, a PSC structure with (CH3NH3)2CuCl4 as the active layer. By employing a two-step chemical method, we have successfully synthesized (CH3NH3)2CuCl4, and its optical band gap was determined using Tauc’s extrapolation method. Utilizing the experimentally determined bandgap as the simulation input, we predicted a solar architecture consisting of glass substrate/fluorine-doped tin oxide/TiO2/(CH3NH3)2CuCl4/spiro-OMeTAD/Pt, which exhibited an impressive conversion efficiency of 27.93% along with a fill factor of 62.04%, J
sc of 34.39 mA cm−2, and V
oc of 1.31 V. Through the software, we conducted a comprehensive study on the impact of back metal contact, hole transport layer, electron transport layer, layer thickness, temperature, and defect density on the overall device performance. These results unveil the development of an environmentally friendly PSC based on methylammonium copper.
First-principles studies of oxygen interstitial dopants in RbPbI3 halide for perovskite solar cells
Authors: Yang Chongyao , Wu Wei , Choy Kwang-Leong
Published: November 2023

Recently perovskite solar cells (PSCs) have caught much attention. Oxygen atom (O1) and molecule (O2) are important dopants to influence the stability of the structural, electronic and optical properties, thus the performance of PSCs. RbPbX3-type perovskites have fantastic chemical stability and good power conversion efficiency. Here we have studied the effects of interstitial O1 and O2 on the structural properties, and hence the electronic structure of RbPbI3 from first principles. We have included the van der Waals (vdW) forces into our density-functional-theory calculations. The formation of dopant level within the pristine band gap has been found when incorporating oxygen. The defect level, dominated by oxygen and iodine, is above the valence band maximum by 0.5–1.3 eV, depending on the location of the defects in the bulk. In addition, we can see the bandwidths of the defect levels are very narrow, which could trap the electron and affect the transport properties. In addition, a metallic state has been found in our calculations for interstitial oxygen molecule when there are strong O–O, O–Pb, and O–I bonds, indicating the complex nature of oxygen-doped PSCs. The comparison between the defect formation energies when doping oxygen atom and molecules is consistent with the previous report about oxygen-molecule passivation of PSCs. Our work has therefore provided important theoretical insight to the effect of oxygen dopants on the electronic structure of RbPbI3.
Trajectories of square lattice staircase polygons
Authors: Janse van Rensburg E J
Published: November 2023

The distribution of monomers in a coating of grafted and adsorbing polymers is modelled using a grafted staircase polygon in the square lattice. The adsorbing staircase polygon consists of a bottom and a top lattice path (branches) and the asymptotic probability density that vertices in the lattice are occupied by these paths is determined. This is a model consisting of two linear polymers grafted to a hard wall in a coating. The probability that either the bottom path, or the top path, of a staircase polygon passes through a lattice site with coordinates

(
⌊
ϵ
n
⌋
,
⌊
δ

n

⌋
)

, for 0 < ϵ < 1 and δ ≥ 0, is determined asymptotically as n → ∞ . This gives the probability density of vertices in the staircase polygon in the scaling limit (as n → ∞ ):

P

r

f
,
(
both
)

(
ϵ
,
δ
)

=

δ

2

(
15

ϵ

2

1
−
ϵ

2

−
12

δ

2

ϵ
(
1
−
ϵ
)
+
4

δ

4

)

3

π

ϵ

7

1
−
ϵ

7

e

−

δ

2

/

ϵ
(
1
−
ϵ
)

.

The densities of other cases, grafted and adsorbed, and at the adsorption critical point (or special point), are also determined. In these cases the most likely and mean trajectories of the paths are determined. The results show that low density regions in the distribution induce entropic forces on test particles which confine them next to the hard wall, or between branches of the staircase polygon. These results give qualitative mechanisms for the stabilisation of a drug particle confined to a polymer coating in a drug delivery system such as a drug-eluding stent covered by a grafted polymer.
Non-thermal moduli production during preheating in α-attractor inflation models
Authors: Alam Khursid , Bastero-Gil Mar , Dutta Koushik , Ragavendra H.V.
Published: November 2023

Production of gravitationally coupled light moduli fields must be suppressed in the early universe so that its decay products do not alter Big Bang Nucleosynthesis (BBN) predictions for light elements. On the other hand, the moduli quanta can be copiously produced non-thermally during preheating after the end of inflation. In this work, we study the production of moduli in the α-attractor inflationary model through parametric resonances. For our case, where the inflationary potential at its minimum is quartic, the inflaton field self-resonates, and subsequently induces a large production of moduli particles. We find that this production is suppressed for small values of α. Combining semi-analytical estimation and numerical lattice simulations, we infer the parametric dependence on α and learn that α needs to be ≲ 10-8 m
Pl
2 to be consistent with BBN for 𝒪(1) coupling between inflaton and moduli. This in turn predicts an upper bound on the energy scale of inflation and on
the reheating temperature.
Planar matrices and arrays of Feynman diagrams
Authors: Cachazo Freddy , Guevara Alfredo , Umbert Bruno , Zhang Yong
Published: November 2023

Recently, planar collections of Feynman diagrams were proposed by Borges and one of the authors as the natural generalization of Feynman diagrams for the computation of k = 3 biadjoint amplitudes. Planar collections are one-dimensional arrays of metric trees satisfying an induced planarity and compatibility condition. In this work, we introduce planar matrices of Feynman diagrams as the objects that compute k = 4 biadjoint amplitudes. These are symmetric matrices of metric trees satisfying compatibility conditions. We introduce two notions of combinatorial bootstrap techniques for finding collections from Feynman diagrams and matrices from collections. As applications of the first, we find all 693, 13 612 and 346 710 collections for (k, n) = (3, 7), (3, 8) and (3, 9), respectively. As applications of the second kind, we find all 90 608 and 30 659 424 planar matrices that compute (k, n) = (4, 8) and (4, 9) biadjoint amplitudes, respectively. As an example of the evaluation of matrices of Feynman diagrams, we present the complete form of the (4, 8) and (4, 9) biadjoint amplitudes. We also start a study of higher-dimensional arrays of Feynman diagrams, including the combinatorial version of the duality between (k, n) and (n − k, n) objects.
Radiative decays
in covariant confined quark model*
Authors: Tran C. T. , Ivanov M. A. , Santorelli P. , Vo Q. C.
Published: November 2023

Radiative decays

are revisited in light of new experimental data from the BaBar and BESIII Collaborations. The radiative couplings

encoding nonperturbative QCD effects are calculated in the framework of the covariant confined quark model developed by us. We compare our results with other theoretical studies and experimental data. The couplings (in

)

and

calculated in our model agree with the corresponding experimental data

and

. The most interesting case is the decay

, for which a recent prediction based on light-cone sum rules at next-to-leading order

deviates from the first (and only to date) lattice QCD result

at nearly

. Our calculation yields

, which falls somehow between the two mentioned results, although it is larger than those predicted in other studies using quark models or QCD sum rules.
Modeling a new Gimbal System using Nonlinear ARX (NARX) Model
Authors: Osamah A. E , Hassrizal H. B. , Othman S. M.
Published: November 2023

A new 3-degree-of-freedom gimbal system design has been developed and experimented at Universiti Malaysia Perlis (UniMAP). The gimbal system is built from polylactic acid (PLA) using a 3D printer. Based on the analysis, the gimbal system can hold up to 23.45 kg and 69.90 MPa of stress. Thus, the gimbal system requires further analysis to investigate the system’s capability in terms of control and stability. Hence, this paper models the gimbal system to the mathematical modelling using the black-box technique with the Nonlinear ARX (NARX) model to achieve the objective. There are six regressor parameters set up to obtain the model where the input and output data for the gimbal axes (roll, pitch and yaw) are gathered from the experiment. The result shows that the best fitting percentage with low complexity is the 4th-order nonlinear regressor with 96.08% (yaw), 95.63% (roll) and 94.65% (pitch). Thus, the gimbal system shows that the model has high accuracy and is suitable to use for further control and stability analysis.
Assessment of magnetic field on body axis and orbit axis of RazakSAT in Near Equatorial Orbit using IGRF model
Authors: Hasan M Z , Fadly M , Said M A M , Hazadura N H , Khalid N S
Published: November 2023

Magnetometer is reference sensor of satellite that function to measure the vector of magnetic field during satellite enter the orbit. The magnetic field measurement vector will be employed in the Attitude Determination System (ADS) to calculate the satellite’s orientation with respect to the Earth. However, any misalignments or disturbances on the ADS can affect the orientation of the satellite in terms of the orbital position. Therefore, in this paper assessment of magnetic field on body axis and orbit axis of RazakSAT by using The International Geomagnetic Reference Field (IGRF) model. RazakSAT as references to verify the IGRF model by using residual analysis that percentage error less than 5% requirement from Astronautic Technology Sdn Bhd (ATSB). The result show, Y-axis and Z-axis from orbit frame meet the requirement of ATSB is less than 5%.
Simulation of RPC responses in mini-Iron Calorimeter for cosmic ray muon studies
Authors: John J.M. , Majumder G. , Pethuraj S.
Published: November 2023

A Prototype of the Iron Calorimeter for the India-based
Neutrino Observatory is currently running in Madurai, India. This
consists of twenty large area single gap Resistive Plate Chambers
(RPCs) of size, ∼ 185 cm × 175 cm sandwiched
between 11 layers of iron plates of thickness 5.6 cm. The total
size of the mini-Iron Calorimeter(mini-ICAL) is
4 m × 4 m × 1.2 m and having a weight of
85 tons is a (1/600) scaled-down version of the ICAL detector of
INO [1]. The detector is magnetized using iron plates
and two sets of copper coils, each coil has 18 turns. The central
region of the mini-ICAL, where the RPCs are placed, has a nearly
uniform magnetic field of 1.4 T, similar to the magnetic field in
the final ICAL detector. This prototype serves as the basis for the
design of the demonstrators, which closely mimics the
characteristics of a future ICAL. This detector is built to test the
final electronics in the fringe field of the magnet and also to
develop the experience to construct the ICAL detector.

The mini-ICAL has been operational since 2018 and collects cosmic
muon data with different configurations of RPC, and electronics,
which are continuously changing for various R&D efforts. Dedicated
efforts are made in parallel to measure the momentum and azimuthal
angle of μ+ and μ- independently, which could be an
important input to the cosmic neutrino event generators. To improve
the precision of those measurements a dedicated simulation effort
was made, particularly in the digitisation of the RPC signal for a
real detector simulation, where efficiency, noise rate, strip
multiplicity, etc. were matched with the real data collected during
runs at mini-ICAL.
The potential of modified karst water as a substitute for microalgae culture media
Authors: Pratiwi N T M , Widigdo B , Krisanti M , Ayu I P , Iswantari A
Published: November 2023

Karst water concocted culture medium which contains high concentration of complex minerals was presumed to support production of microalgae, such as Spirulina sp. (Arthrospira sp.), Chlorella sp., and Nannochloropsis sp. This study aims to evaluate the potential of enriched karst water medium to grow Spirulina sp., Chlorella sp., and Nannochloropsis sp. There were two batches of culture with different treatments of nutrient supplementary; the first was for Spirulina sp. and the second was for Chlorella sp. and Nannochloropsis sp. The results showed that all treatments were suitable for Spirulina sp. with different growth rates. The medium with 20:1 N/P ratio showed the best productivity for Chlorella sp., and 10:1 N/P ratio for Nannochloropsis sp. The pure karst water and all level as the nutrient modified karst water media showed a relatively similar growth rate of Spirulina sp. Furthermore, in the best medium for Chlorella sp. and Nannochloropsis sp. gave increasing density until the end of observation, instead of a death phase of commercial addition batch culture. Generally, modified karst water has the potential to be used as the microalgae growing medium.
Phytoplankton Community Dynamics in Sei Gesek Reservoir, Bintan Island
Authors: Apriadi T , Melani W R , Zulfikar A , Muzammil W , Sabriyati D
Published: November 2023

Bintan is a small island that has limited fresh water resources. Sei Gesek Reservoir is one of the drinking water sources in there. The aim of this research is to determine the dynamics of diversity and abundance phytoplankton in Sei Gesek Reservoir, Bintan Island, Riau Islands. Sampling was carried out at three area representing inlet, center, and outlet of Sei Gesek reservoir in periods 2016-2018. Phytoplankton samples were collected using plankton net by static method. Phytoplankton group were composed of 3 division: Chlorophyta, Cyanophyta, and Bacillariophyta. Each class of phytoplankton has dynamics of abundance and species each year. The highest average abundance was found in 2016 and then fluctuated to 2018. The highest species and abundance of the division were Chlorophyta, Cyanophyta, and Bacillariophyta, respectively. Phytoplankton community dynamics in Sei Gesek Reservoir is influenced by decreased water volume and acidic pH.
The nexus between stakeholders’ role, eco-empowerment, and community perceptions on mangrove ecosystem management’s sustainability
Authors: Suswadi  , Irawan N C , Esthi R B , Novitasari S
Published: November 2023

Managing coastal ecosystem resources and mangrove forests in Sayung District, Demak Regency faces many challenges if it does not involve the community’s active role and stakeholders. Ecological empowerment faces the abrasion, erosion, and sedimentation of coastal areas that mangrove stands have not covered. On the other hand, the revitalization and rehabilitation program is still not optimal, so it requires the participation of many institutions, not only from the government but also from non-government, so that all management programs run in tandem are integrated and is following regulations. This study aims to determine the relationship between the role of stakeholders, eco-empowerment, and community perceptions of the sustainability of mangrove ecosystem management. The location selection used the purposive method. While the sample selection used the purposive and snowball random sampling methods. Data analysis used the partial least square method. The study’s results indicate that the stakeholders’ role has a direct positive and significant impact on eco-empowerment and perceptions of sustainability. Eco-empowerment has a direct positive and significant effect on the perception of sustainability. The role of stakeholders has a positive and indirect influence on the perception of sustainability through eco-empowerment activities.
Spatial and temporal distribution of dissolved oxygen in the Ciliwung River, DKI Jakarta Province
Authors: Aprilia M , Effendi H , Hariyadi S
Published: November 2023

The Ciliwung River is one of the main streams that pass Jakarta. This river flows through the city’s center and passes many villages, highly inhabited homes, and slums, necessitating special attention to the Ciliwung River’s water quality. Because dissolved oxygen is essential for aquatic life, it is the most critical measure of freshwater quality. This study aimed to analyze the spatial and temporal distribution of dissolved oxygen in the Ciliwung River in DKI Jakarta Province. Water quality was monitored during the rainy (February and June 2021) and the dry seasons (August and September 2021). The study area comprised 18 observation sites along the Ciliwung River in DKI Jakarta. Spatially, in Central and North Jakarta, the dissolved oxygen content of the Ciliwung River is relatively low. Temporarily, the dissolved oxygen concentration was somewhat more significant during the rainy season, but statistical testing revealed no statistically significant difference between the rainy and dry seasons.
Effect of rainfall on water condition and catch results of eel (Anguilla spp.) in Cicatih River, Sukabumi, West Java
Authors: Nugraha R P , Wildan D M , Rahmadya A , Setiawan F , Ridwansyah I
Published: November 2023

Indonesia is one of the countries with the largest eel catches in the world and is very vulnerable to climate change, especially with rainfall. Rainfall affects fishing activities and the surrounding aquatic environment. Fish resources in the Cicatih River are quite diverse, one of which is high economic fish, namely eel. This study aims to provide information about rainfall’s effect on eel catch results in Cicatih Rives, Sukabumi Regency. Sampling was conducted for six months, from August 2021 to January 2022. The method I use in this research is water condition and relationship analysis for water quality using APHA 2017 and analysis of the relationship between rainfall and fish catches. The result shows that the water quality of the Cicatih River is still in the optimal range for eel life. Still, there are water chemistry parameters that exceed the quality standard, and total nitrogen levels exceed 10mg/l. Most of the large eels in the Cicatih River were caught in the rainy season. Rainfall also affects the duration when fishing, and it is negatively correlated. High rainfall affects the time of fishing, which in turn affects the number of eel catches.
The decent catch size of mackerel tuna (Euthynnus affinis Cantor, 1849) and its implication to fisheries management in the border area of Indonesia and Timor Leste
Authors: Rehatta B M , Ninef J S R , Ginzel F I
Published: November 2023

A study of mackerel tuna (Euthynnus affinis) has been conducted in Ombai Strait in the border area of Indonesia and Timor Leste. The objective of this study is to determine the decent catch size of mackerel tuna in Ombai Strait, based on the length at first caught (Lc), the length of first mature (Lm), and prediction of spawning season. Monthly data collection conducted in May 2018 – June 2019 from fish landing sites in Belu, East Nusa Tenggara, Indonesia. There were 1516 fish collected to measure the total length and gonadal maturity level. The results showed that the size of the mackerel tuna population in the Ombai Strait was between 131 - 450 mmTL. The length at first matured is 210,9 mmTL and the average length at first caught (Lc50) is 152,1 mmTL. Length of first matured was larger than length at first caught (Lm > Lc). The decent catch size is 211 mmTL and the prediction of spawning season in May – June. These results indicate that it is necessary to regulate selective fishing gears to ensure the sustainability of mackerel tuna resources in Ombai Strait.
Effectiveness of ICM system and its contribution to local capacity development: Case study in West Papua Province
Authors: Isdahartati  , Damar A , Solihin A , Kurniawan F , Yonvitner  , Amin M A Al
Published: November 2023

Integration and coordination of various coastal and marine management efforts is the major objective of the integrated coastal management (ICM) approach. In the implementation of the Raja Ampat’s COREMAP CTI activities, PKSPL IPB University replicates ICM practices, in Yensawai Village, Raja Ampat Regency. Those include cycle guidelines, structures, and models of ICM implementation at the local government level. The ICM cycle is very important because it provides a gradual and non-negotiable “must” to be able to proceed to the next several steps. The cycle must be done correctly to contribute to continuous improvement. The goal is to have a functioning ICM system to improve local government services and contribute to sustainable development. PKSPL IPB University has successfully demonstrated its effectiveness and impact on the implementation of the ICM program. This can be seen in the increasing adoption of the concept of sustainability in local governments as well as increasing local political commitment to the rehabilitation of sustainable coastal ecosystems in West Yensawai Village, Raja Ampat Regency. The experience of PKSPL IPB University in other ICM pilot sites in implementing ICM integration was replicated in the COREMAP CTI program in West Papua Province. Contribution factors adopted by ICM in local capacity building include: (i) local government involvement; (ii) the leadership role of the coordination mechanism; (iii) key steps of the ICM Cycle process; (iv) vision-led programs; (v) local champions; (vi) visible achievements and impacts; (vii) increased value of integrated planning and management approaches, and local and political commitments.
Significant metal buildup within the organs of Lethrinus sp. and Caranx ignobilis (Forsskål 1775) from Kao Bay waters, Indonesia
Authors: Pertiwi R T A , Ariyanto D , Edward  , Lessy M R , Putri B
Published: November 2023

Fish organs can contain heavy metals. This study’s objective was to map the distribution of heavy metals in several fish organs.. The research was conducted in Kao Bay waters from April to September 2019. The samples obtained were prepared at the aquatic science laboratory of Khairun University and were analyzed at the Environmental Productivity Laboratory of IPB University Bogor using the AAS instrument to determine heavy metals. The heavy metals accumulation in Lethrinus sp fish meat was Zn > Cu > Mn > Pb > Ni > Hg > Cd, and in gill was Zn > Pb > Mn > Ni > Hg > Cd. The accumulation of heavy metals in Caranx ignobilis fish meat was Zn > Pb > Mn > Cu > Ni > Hg > Cd, whereas the accumulation in the gills was Zn > Pb > Ni > Mn > Cd > Hg > Cu. Zn accumulation was the highest heavy metal discovered in fish as a result.
Ammonium removal characteristics of facultative heterotrophic nitrifying bacteria isolated from shortfin eel (Anguilla bicolor) recirculation aquaculture system
Authors: Afnur E S , Istiqomah I , Isnansetyo A , Murwantoko  , Sukardi
Published: November 2023

Nitrifying bacteria play a role in reducing the amount of toxic ammonia in the rearing media. The purpose of this study was to characterize, and identify nitrifying bacteria isolated from shortfin eel (Anguilla bicolor) recirculation aquaculture system. The selective anorganic nitrifying medium was used to isolate the bacteria, followed by cultivation of the bacterium in the organic medium (Triptone Soya Agar). Bacterial characterization was carried out for nine days using a nitrification activity test. A safety test was conducted by intraperitoneal injection of bacteria in healthy eels (Anguilla bicolor). Phenotypic characterizations and analysis of the 16S rRNA and DNA gyrB genes were used to identify the bacteria. This study resulted in the successful isolation of five isolates. The three isolates (ENS2, ENS4, and ENS5) were non-pathogenic and exhibited high nitrifying activities. The isolates reduced 40-50% of ammonia concentration in three days, resulting in a 2-5 mg/L of nitrate concentration in the medium. The 16S rRNA and gyrase B genes sequences of ENS5 were close to Klebsiella quasipneumoniae, but with the low similarity (97.9% and 99.3%, respectively). It is concluded that recirculation aquaculture system of shortfin eel (Anguilla bicolor) harbor of facultative heterotrophic nitrifying bacteria has potential for further application in shortfin eel aquaculture waste treatment facilities.