bluuebunny/crossref_metadata_2025_split huggingface dataset:
DINAMIKA POPULASI IKAN TENGGIRI (Scomberomorus commerson) YANG DIDARATKAN DI PELABUHAN PERIKANAN SUNGAI RENGAS, KABUPATEN KUBURAYA
Authors: Suwardi Via Peronita , Rahayu Sri , Hadinata Fitra Wira 
Published: October 2023

Ikan tenggiri adalah ikan pelagis yang hidup dipermukaan dan kolom perairan. Ikan tenggiri merupakan salah satu tangkapan utama di Pelabuhan Perikanan Sungai Rengas dan memiliki nilai ekonomis yang cukup tinggi. Produksi hasil tangkapan ikan tenggiri di Pelabuhan Perikanan Sungai Rengas tahun 2018 sebesar 113,826 ton dan tahun 2021 sebesar 66,318 ton, mengalami penurunan di tahun 2021. Oleh karena itu, perlu dilakukan penelitian mengenai Dinamika Populasi Ikan Tenggiri (Scomberomous cammerson) yang Didaratkan di Pelabuhan Perikanan Sungai Rengas agar bisa dijadikan sebagai acuan maupun dasar untuk kebijakan kedepanya. Penelitian telah dilakukan pada bulan Desember 2020 – Februari 2023 di Pelabuhan Perikanan Sungai Rengas. Tujuan penelitian adalah untuk mengetahui sebaran frekuensi panjang ikan tenggiri, hubungan panjang berat ikan tenggiri, pertumbuhan ikan tenggiri, mortalitas dan eksploitasi ikan tenggiri. Metode yang digunakan dalam pengambilan sampel adalah metode random sampling dengan memilih 1 box dari 2 kapal gill net. Pengambilan sampel dilakukan 2 minggu 1 kali selama 3 bulan. Analisis data dilakukan menggunakan Microsoft excel dan software FISAT II Ver 1.2.2. Hasil penelitian menunjukkan sebaran frekuensi panjang ikan tenggiri tertinggi ada diinterval kelas 68,2-71,2 cm sejumlah 70 ekor, sedangkan kelas interval terendah 60,2-63,2 sejumlah 5 ekor. Hubungan panjang berat ikan tenggiri bersifat allometrik negatif dengan nilai b 2,49. Laju pertumbuhan ikan tenggiri tergolong lambat dengan nilai K (koefisien) 0,60 pertahun. Mortalitas alami sebesar 0,97 pertahun lebih besar dari mortalitas penagkapan 0,45 pertahun dan laju eksploitasi 0,32 pertahun menunjukan tingkat eksploitasi ikan tenggiri pemanfaatanya dibawah optimal (underfishing).
IDENTIFIKASI BAKTERI Aeromonas sp. PADA IKAN TENGADAK (Barbonymus schwanenfeldii) DI UPT PERIKANAN BUDIDAYA AIR PAYAU DAN LAUT (UPT-PBAPL) KALIMANTAN BARAT
Authors: Qutsiyeh Qutsiyeh , Sirodjul Ahmad Mulyadi , Rahayu Sri 
Published: October 2023

Ikan tengadak (Barbonymus schwanenfeldii) merupakan salah satu dari sekian banyak ikan air tawar yang terdapat di danau, sungai-sungai besar, kecil maupun di kanal-kanal dan parit. Salah satu upaya yang dilakukan untuk menjaga kelestarian spesies ini adalah dengan cara melakukan kegiatan budidaya. Penelitian ini bertujuan untuk mengidentifikasi keberadaan bakteri Aeromonas sp. pada ikan tengadak yang dibudidayakan di kolam UPT-PBAPL Kalimantan Barat. Penelitian ini dilaksanakan kurang lebih 2 bulan di dua tempat yaitu UPT-PBAPL Kecamatan Anjongan dan SKIPM Pontianak. Pengambilan sampel dilakukan secara acak dan uji bakteri dilakukan dengan metode konvensional. Sampel selanjutnya dilakukan uji laboratorium, dengan parameter berupa gejala klinis, karakteristik morfologi dan koloni bakteri serta uji biokimia. Parameter penunjang yang digunakan berupa kualitas perairan. Data yang diperoleh kemudian dianalisis secara deskriptif kualitatif. Hasil penelitian menunjukan sampel ikan tengadak tidak terdapat gejala klinis serangan bakteri. Sebagian besar koloni bakteri berbentuk bulat, tepian rata, warna krem dan elevasi cembung. Morfologi sel bakteri berbentuk batang pendek dan berwarna pink. Uji biokimia menunjukan gram negatif, oksidase positif, katalase positif, indol positif dan negatif, motility positif, ornithine dekarbokxilase negatif, glukosa positif, membentuk dan tidak membentuk gas, serta bersifat fermentatif. Berdasarkan kriteria tersebut menunjukan bahwa ikan tengadak terinfeksi bakteri Aeromonas sp. Yang bersifat parasit namun tidak mengganggu dan belum mampu menimbulkan penyakit pada ikan tersebut. Parameter kualitas air berupa suhu, pH dan Do layak untuk komoditas budidaya ikan air tawar.
DINAMIKA POPULASI IKAN TONGKOL (Euthynnus affinis) YANG DIDARATKAN DI PELABUHAN PERIKANAN SUNGAI RENGAS, KABUPATEN KUBURAYA
Authors: Jesila Lila , Sirodjul Ahmad Mulyadi , Kurniadi Bambang 
Published: October 2023

Ikan tongkol (Euthynnus affinis) merupakan salah satu jenis hasil tangkapan yang didaratkan di Pelabuhan Perikanan Sungai Rengas, Kabupaten Kubu Raya. Penelitian ini bertujuan untuk untuk mengetahui sebaran frekuensi panjang ikan, hubungan panjang dan berat, parameter pertumbuhan, serta mortalitas dan laju eksploitasi. Analisis data dilakukan dengan menggunakan bantuan software FISAT II Ver. 1.2.2 Tahun 2005 yang dikeluarkan oleh FAO-ICLARM. Penelitian ini dilakukan pada bulan Desember 2022 sampai dengan bulan Februari 2023. Metode yang digunakan dalam pengambilan sampel ikan tongkol adalah metode systematic random sampling. Hasil penelitian menunjukan sebaran frekuensi panjang cagak ikan tongkol selama penelitian diperoleh panjang minimum 30,7 cm dan panjang maksimum 56,5 cm. Persamaan hubungan panjang dan berat ikan tongkol adalah W = 0,0918L2,592 dengan koefisien determinasi (R2) 0,853. Pola pertumbuhan bersifat allometrik negatif. Koefisien pertumbuhan (K) adalah 0,70 per tahun dengan panjang asimtotik (L∞) sebesar 56,50 dan umur teoritis mula-mula (t0) sebesar -0,714 per tahun. Laju mortalitas total (Z) adalah 1,65 per tahun, mortalitas alami (M) sebesar 1,21 per tahun, laju mortalitas penangkapan (F) sebesar 0,44 per tahun dan laju eksploitasi (E) sebesar 0,27. Nilai laju eksploitasi ini belum melebihi nilai eksploitasi optimum 0,5
ANALISIS DAYA DUKUNG LINGKUNGAN BERBASIS LAHAN DI KECAMATAN SEPONTI KABUPATEN KAYONG UTARA
Authors: Rexa Alfonsus Alfa , Riduansyah Riduansyah , Junaidi Junaidi 
Published: October 2023

Imbangan tingkat pemanfaatan lahan dengan daya dukung lahan menjadi ukuran kelayakan penggunaan lahan, sebaliknya jika pemakaian lahan telah melampaui kemampuan daya dukung lahan maka pemanfaatan lahan tidak dipakai secara efektif, maka secara jelas dapat dikatakan bahwa daya dukung lahan adalah kemampuan lahan untuk mendukung kebutuhan-kebutuhan manusia dalam bentuk penggunaan lahan, yang pada akhirnya tujuannya adalah untuk memenuhi kebutuhan manusia terutama bahan makanan. Tujuan penelitian untuk mengetahui daya dukung lingkungan berbasis lahan sawah di Kecamatan Seponti. Hasil penelitian menunjukkan bahwa terdapat 3 satuan lahan dengan luasan yang bervariasi, satuan lahan I seluas 1.891,54 hektar (4,85%), sedangkan satuan lahan II seluas 4.087,73 hektar (10,48%), dan satuan lahan terluas adalah satuan lahan III dengan luasan 33.043,00 hektar (84,68%) luasan satuan lahan diketahui melalui analisis GIS. Pada hasil survei, pengamatan boring, dan minipit di lokasi penelitian, terdapat 2 ordo tanah yaitu Inceptisol dan Entisol. Berdasarkan hasil evaluasi kemampuan lahan kelas kemampuan lahan yaitu kelas III-s, w. Lahan pada kelas III dapat digunakan untuk tanaman semusim, tanaman yang lindung dan cagar alam (LH No 17 Tahun 2009). Lahan pada kelas III ini cocok dijadikan lahan sawah, sesuai dengan penggunaan lahan pada LH No 17 Tahun 2009. Ketersediaan lahan ditentukan berdasarkan dari data luasan lahan sawah yang diketahui melalui analisis GIS) di Kecamatan Seponti adalah 1.484,80 ha dan kebutuhan lahan di Kecamatan Seponti adalah 417,20 ha/tahun. Berdasarkan analisis daya dukung lahan yang dilakukan diperoleh hasil bahwa daerah penelitian memiliki nilai ketersediaan dan kebutuhan lahan yang berstatus surplus.
STATUS STOK UDANG DOGOL (Metapenaeus monoceros) YANG DIDARATKAN DI TPI SUNGAI KAKAP KABUPATEN KUBU RAYA
Authors: Delviana Sianipar Valeria Yerika , Padmasari Soetignya Widadi , Wira Hadinata Fitra 
Published: October 2023

Informasi mengenai stok udang dogol (Metapenaus monoceros) masih sangat minim dilakukan khususnya di Perairan Sungai Kakap Kabupaten Kubu Raya, Kalimantan Barat. Penelitian ini bertujuan untuk mengetahui status stok udang dogol yang tertangkap di Sungai Kakap. Metode yang digunakan dalam pengambilan sampel yaitu random sampling dengan menentukan 2 orang nelayan dipilih berdasarkan pengoperasian alat tangkap trawl dan mengambil sampel udang putih 10% dari hasil tangkapan. Penelitian di lapangan dilakukan selama 3 bulan yaitu pada bulan Maret-Mei 2023. Berdasarkan hasil penelitian yang telah dilakukan udang dogol yang tertangkap selama penelitian sebanyak 954 ekor, di mana udang dogol jantan yang tertangkap sebanyak 494 ekor dan betina sebanyak 460 ekor. Sebaran panjang karapas udang dogol yang diamati selama penelitian berkisar antara 15,5-65,5 mm, dan berat 16,5-21,5 gram. Hubungan panjang dan berat udang dogol jantan, betina dan gabungan bersifat allometrik negatif. Hubungan panjang dan panjang karapas udang dogol jantan, betina dan gabungan bersifat allometrik negatif. Udang dogol yang tertangkap di Sungai Kakap berdasarkan nilai K didapatkan hasil 2,5 per tahun dengan nilai L∞ 73,67 mm jantan dan nilai K 2,1 per tahun dengan nilai L∞ 97,13 mm betina, sedangkan gabungan didapatkan nilai K 2,1 per tahun dengan L∞ 75,13 mm. Laju kematian total (Z) dan laju kematian alami (M) masing-masing 2,40/tahun dan 1,22/tahun. Laju kematian karena penangkapan (F) sebagai 5,14/tahun dan laju eksploitasi (E) sekitar 0,80/tahun. Dengan demikian status stok udang dogol sudah berada pada penangkapan berlebih (overfishing).
Monitoring of Radiation Defects Recovery in MgAl2O4 During Annealing by Optical Spectroscopy
Authors: Kazarinov Yurii , Megela Ivan , Pop Oksana 
Published: October 2023

The extraordinary radiation resistance of single crystals and ceramics of magnesium-aluminum spinel to neutron irradiation is known, but the mechanisms that provide it are not yet understood. Irradiation of crystals with fast electrons creates defects partially similar to defects in neutron irradiation. The difference in the destructive effect is the significant level of ionization during electron irradiation. Therefore, to compare the results of irradiation by different sources, it is necessary to determine the parameters of radiation defects. One of them is the conditions of radiation damage recovery. When irradiating the crystals with electrons with an energy of 12.5 MeV to a fluence of 6.8∙1016 eV/cm2, the concentration of defects such as F-centers 2.6∙1016 cm-3 and V-centers 3∙1017 cm-3 was obtained. TSL and optical absorption spectroscopy methods were used to determine the state of radiation defects in crystals during annealing. Since annealing at temperatures above 900 K leads to complete discoloration of all optically active centers, therefore, to determine the effect of annealing at higher temperatures, the crystals after annealing were irradiated with ultraviolet light. At temperatures above 900 K, cationic disorder begins to increase, but annealing at 1010 K for 30 minutes was not enough to completely restore the damage to the crystal lattice created by electron irradiation. This is expected, given the characteristic relaxation time of cation disorder, which reaches 1000 hours at this temperature. However, increasing the annealing temperature to 1050 K, in addition to the recovery of radiation defects, creates a noticeable additional difference in TSL, probably due to the formation of complexes from residual F-centers. However, determining the difference between irradiated and non-irradiated crystals gives a difference in the concentration of F-centers at the level of 1015 cm-3.
Molecular Geometry, Homo-Lumo Analysis and Mulliken Charge Distribution of 2,6-Dichloro-4-Fluoro Phenol Using DFT and HF Method
Authors: Surbhi  , Shalya Deeya , Kumar Sarvendra 
Published: October 2023

Phenolic compounds are used in human diet, commonly present in plants. Foremost polyphenolic compounds found in plants are flavanols, flavonoids, flavonones, iso-flavones, phenolic acids, flavonoids, chalcones, lignans etc. These compounds possess antimicrobial, antiviral and anti-inflammatory properties along with high antioxidative activity. The antioxidative activity of phenolic compounds depends on their structure. The polyphenols are very useful for the treatment of inflammation, cancer, anti-ageing purposes in cosmetic formulations, and nutraceutical applications. This article focused on substituted phenol, taking into concern their potential health benefits. The recent rise in machine-learning methods has engendered many advances in the molecular sciences. Using desired level of electronic structure theory from density functional theory, we can calculate the properties (electronic structure, force field, energy) of atomistic systems. The full electron density carries with it a considerable computational cost. While the DFT calculation loses accuracy when the molecule is either extended or compressed, Δ-DFT corrects these errors. Here, molecular point group symmetries are used to obtain chemical accuracy. The optimal 2,6-dichloro-4-fluoro phenol molecular geometry was derived using the 6-311+G (d, p) basis set and DFT/B3LYP (density functional theory) and Hartree-Fock (HF) techniques. A detailed interpretation of Homo-Lumo analysis of 2,6-dichloro-4-fluoro phenol is also listed. Using the 6-311+G (d, p) basis set and the Hartree-Fock (HF) method, the Mulliken charge distribution of this molecule has also been computed.
Semi-Empirical Predictions for Hardness of Rare Earth Pyrochlores; High-Permittivity Dielectrics and Thermal Barrier Coating Materials
Authors: Bhati Rekha , Yadav Dheerendra Singh , Varshney Preeti , Gupta Rajesh Chandra , Verma Ajay Singh 
Published: October 2023

Herein, we have formulated a simplistic semi-empirical model for Vicker’s hardness of rare earth based pyrochlore compounds. We have considered the structured 97 pyrochlore compounds for Vicker’s hardness calculations. The plasmon energy (ħωp) depends on basic parameters of the material such as Ne-effective number of free electrons per unit volume participating in plasma oscillations, e-electronic charge and m-mass of an electron. The proposed model predicts that the experimental and theoretical values of Vicker’s hardness increases as plasmon energy of pyrochlore increases. We have found that the calculated values are in better agreement with available experimental and theoretical data, which supports the validity of the model. This model supports the modeling of emerging functional pyrochlore compounds and helps to understand their mechanical properties for excellent thermal stability, superconductivities, batteries, ferroelectricity, water spitting, high ionic conductivity, good photoluminescence, inherent oxygen vacancies, exotic magnetism, and now-a-days most importantly in nuclear waste encapsulation and aerospace industry
Shell Model Investigation of Some p and sd-Shell Nuclei with Harmonic Oscillator and Skyrme Interactions
Authors: M. Obaid Sarah , Abbas Shaimaa A. , Hussein Aeshah Ali , Mohammed Noor Adil , Majeed Fouad A. 
Published: October 2023

In this study, the longitudinal charge and form factors for the nuclei 9Be and 28Si lying in the p and sd shells are studied by employing the Harmonic Oscillator potential (HO) and Skyrme effective interaction (Sk35−Skzs∗). The C0 and C2 from factors calculated for the ground state 3/2-, the 5/2- (2.429 MeV) and 7/2- (6.380 MeV) for 9Be, while the ground state 0+ and 2+ (1.779 MeV) state for 28Si nucleus. Calculations of microscopic perturbations that involve intermediate one-particle, one-hole excitation from the core and MS orbits into all upper orbits with excitations are utilized to generate the effective charges necessary to account for the “core polarization effect”. The shell model calculations are utilized on the extended model space to include all 1s, 1p, 2s–1d, 2p‑1f orbits with truncation. Bohr-Mottelson collective model and Tassie model with properly estimated effective neutron and proton charges are taken into account to consider the effect of the core contribution. The estimated form factors were compared with the measured available data and they were in good agreement for most of the studied states. A conclusion can be drawn that truncation is very good choice to study the longitudinal form factors.

The choice of Harmonic Oscillator potential (HO) and Skyrme effective interaction (Sk35−Skzs∗) is adequate for form estimation of longitudinal form factors.
The estimation of the effective charges based on microscopic perturbations that involve intermediate one-particle, one-hole excitation from the core and MS orbits into all upper orbits with excitations is adequate.
The truncation proves to be very successful to perform the study.
X-Ray Structural Investigations Of n-Si<Pt> Irradiated with Protons
Authors: Utamuradova Sharifa B. , Stanchik Aliona V. , Rakhmanov Dilmurod 
Published: October 2023

In this work, the effect of proton irradiation on the change in the structure of silicon samples doped with platinum was studied. The samples were irradiated with protons at a dose of 9×1014 cm-2 with an energy of 600 keV and a current of 1÷1.5 μA. To determine the change in the structure after irradiation, the methods of X-ray diffraction and atomic force microscopy were used. The obtained results indicate that doping with platinum does not lead to a modification of the cubic crystal structure of silicon, but only to minor changes in the structural characteristics and surface morphology. In this case, proton irradiation of a silicon single crystal with a dose of 9.0×1014 cm–2 with an energy of 600 keV leads to the formation of defects without the formation of an amorphous near-surface layer.
Synthesis and Characterization of (PVA-CoO-ZrO2) Nanostructures for Nanooptoelectronic Fields
Authors: Jaber Zainab Sabry , Habeeb Majeed Ali , Radi Waleed Hadi 
Published: October 2023

Nanocomposites have a wide range of applications, including optical integrated circuits, sensors, coatings, and medical devices. As a result, the purpose of this paper is to prepare a new type of nanocomposites made of polyvinyl alcohol (PVA) with different concentrations (0, 1, 2 and 3) wt% of cobalt oxide and zirconium dioxide (CoO-ZrO2) nanoparticles by using casting method. Microscopic photographs demonstrate the fact that the additive distribution amount of NPs in the polymer was uniform, and (CoO-ZrO2) NPs formed a continuous network within the polymer when the concentration reached 3wt.%. The outcomes of optical properties indicate that the absorbance of nanocomposites improves as the concentrations of cobalt oxide and zirconium dioxide nanoparticles increase while transmittance and the optical energy gap decrease. On the other hand, optical constants of nanocomposites (refractive index, absorption coefficient, extinction coefficient, real and imaginary the dielectric constants) and optical conductivity are increase with increases in the weight percentages of (CoO-ZrO2) nanoparticles. These outcomes demonstrate the (PVA-CoO -ZrO2) NCs use for various optical devices.
Thermoelectric Properties Investigation of Ni/Co Doped ZrCoBi Half-Heusler Alloy
Authors: Al-Elaimi Mahmoud 
Published: October 2023

Half-Heusler (HH) thermoelectric (TE) composites have been extensively inspected due to their excellent TE properties in the medium- to high-temperature range. First-principle calculations make it easier to discover or improve more HH compounds. This article presents an ab initio theoretical evaluation of TE properties of Half-Heusler alloy, when doped with Nickel (Ni), using FP-LAPW and the semi classic Boltzmann theory. Thermoelectric parameters were calculated using BoltzTraP code, like Seebeck coefficient ( ), electrical conductivity to relaxation time ratio ( ), electronic thermal conductivity to relaxation time ratio ( ), thermoelectric power factor to relaxation time ratio ( ), and the dimensionless figure-of-merit ( ) in a temperature range of . Calculated Seebeck coefficient reveals that the studied alloys show a tendency to conduct as p-type with balanced TE performance between both charge carriers (holes and electrons). A high electronic thermal conductivity value is found, which predicts a potential use in heat sink applications for the investigated alloys. Obtained results, such as a high thermoelectric power factor and , postulate that alloys could have potential thermoelectric applications.
Enhancement in Some Physical Properties of (PVP: CMC) Blend by the addition of MgO
Authors: Albanda Widad H. , Fakralden D.J. , Hassan N.A. 
Published: October 2023

This research study explores the effects of adding MgO nanoparticles to a polymeric blend composed of 50% PVP and 50% CMC. The blend was prepared using MgO nanoparticles (0.2%, 4%, and 6%) and varying processing conditions. The structural, optical, and electrical properties of the resulting blend were analyzed to determine the impact of the added nanoparticles on the blend's properties. Results showed that the addition of nanoparticles significantly improved the structural, optical, and electrical properties of the polymeric blend. Specifically, the energy gap is 4.224 eV for (PVA: CMC) film and increased to 3.432 eV for (PVA: CMC-6% MgO), the light transmission and reflection properties were enhanced. Additionally, the conductivity of the blend was increased, making it suitable for various applications, including optoelectronics, sensors, and biomedical devices. Overall, this study demonstrates the potential of adding nanoparticles to polymeric blends to improve their properties and highlights the importance of optimizing processing conditions to achieve the desired properties for specific applications.
Bound State and Ro-Vibrational Energies Eigenvalues of Selected Diatomic Molecules with a Class of Inversely Quadratic Yukawa Plus Hulthén Potential Model
Authors: Faithpraise Fina O. , Inyang Etido P. 
Published: October 2023

The Nikiforov-Uvarov approach is used in this study to solve the Schrödinger equation utilizing a class of inversely quadratic Yukawa plus Hulthén potential model with an approximation to the centrifugal term. The normalized wave function and energy eigenvalue equation were obtained. The numerical bound state for a few diatomic molecules (N2, O2, NO, and CO) for various rotational and vibrational quantum numbers was calculated using the energy equation and the related spectroscopic data. Our results show that, with no divergence between the s-wave and l-wave, the energy eigenvalues are very sensitive to the potential and diatomic molecule properties, suggesting that the approximation approach is appropriate for this set of potentials. The results are consistent with earlier studies in the literature, and we also found four special cases of this potential.
Structural and Optical Prperties of (ZnO/NiO) Thin Films Mixture
Authors: Amiar Ali , Belahssen Okba , Ghougali Mebrouk , Mimouni Mourad , Rihia Ghani , Mahboub Mohammed Sadok , Benkrima Yamina 
Published: October 2023

In this study, we prepared mixtures of nickel oxide (NiO) and zinc (ZnO) in different proportions as thin films on high-purity glass substrates, using pyrolysis spray technique. Where samples of mixtures were precipitated from two solutions of nickel nitrate (Ni(NO3)2 ·6H2O) and zinc acetate (C4 H6O4 Zn·2H2O) mixed in different proportions. Then the optical and structural properties of the prepared samples were studied. The transmittance decreases with the increase in the percentage of nickel oxide, which means that increasing the zinc oxide improves the transmittance in all the studied spectral fields. Samples with higher zinc oxide (ZnO) have two energy gaps. Scanning electron microscopy (SEM) showed that the surface morphology of the films has a relatively homogeneous composition. Where it was observed that increasing the proportion of zinc oxide leads to the appearance of zinc oxide granules clearly.