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Productivity constraints on Citron-crested Cockatoos in a rich community of large hole-nesting birds

Avian Research 2022年第1期13卷 25-35页

作者： Anna Reuleaux benny a.siregar Nigel J.Collar Ani Mardiastuti Stuart J.Marsden Department of Natural Sciences Manchester Metropolitan UniversityManchesterUK Burung Indonesia BogorIndonesia BirdLife International CambridgeUK Bogor Agricultural University(IPB University) BogorIndonesia

Knowledge of breeding success and its limiting factors is crucial in assessing species’conservation *** cavity-nesters,parrots are particularly influenced by the availability of suitable cavities and low breeding output,whether due to natural processes or *** the island of Sumba,Indonesia,the Critically Endangered Citron-crested Cockatoo(Cacatua citrinocristata)has the added problem of co-existing with an unusually rich hole-nesting bird community in a forested environment much constrained by habitat *** monitored 95 nesting cavities of cockatoos and their competitors and potential nest-predators,over one to four breeding seasons,using a combination of camera-traps,direct checks on nest contents,and observations from the *** for suitable cavities was intense among three large parrot species,two owls and a *** rates by potential competitors were higher at unoccupied cavities than at those containing active nests,reflecting the guarding behaviour of the *** Endangered Sumba Hornbill(Rhyticeros everetti)dominated observed direct confrontations and was the most frequent visitor to active parrot nests,suggesting a further role as a potential *** prospected many cavities but rarely then attempted to nest:instead the sites were usually occupied by other cavity-nesters,or by *** the few cavities where cockatoos did breed,predation pressure was likely low,and observed success rate high(10 successful of 15 nests),although the low number of nests found early in the breeding cycle suggests that some may have failed before *** competition for cavities suggests a shortage of suitable nest-sites,the need for preservation of old hole-bearing trees and a role for ***,known,safe artificial nest-sites would also provide opportunities to assess the scale of nest-site shortage,allow camera placements to study productivity,exclude some competitors and predators,and prevent ill

关键词： Camera-traps Competition Conservation Hornbills Parrots Predation

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Characterization of Hydroxyapatite Extracted from Crab Shell Using the Hydrothermal Method with Varying Holding Times

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Journal of Renewable Materials 2024年第6期12卷 1145-1163页

作者： Deni Fajar Fitriyana Rifky Ismail Athanasius Priharyoto Bayuseno Januar Parlaungan siregar Tezara Cionita Department of Mechanical Engineering Faculty of EngineeringDiponegoro UniversitySemarangJawa Tengah50275Indonesia Department of Mechanical Engineering Faculty of EngineeringUniversitas Negeri SemarangGunung PatiSemarang50229Indonesia Center for Biomechanics BiomaterialBiomechatronicsand Biosignal Processing(CBIOM3s)Diponegoro UniversitySemarang50275Indonesia Automotive Engineering Center(AEC) Universiti Malaysia Pahang Al-Sultan Abdullah(UMPSA)PahangMalaysia Faculty of Mechanical&Automotive Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekan26600Malaysia Faculty of Engineering and Quantity Surveying INTI International UniversityNilaiMalaysia

Hydroxyapatite(HA)is a bio ceramic commonly utilized in bone tissue engineering due to its bioactive and osteoconductive *** shells are usually disregarded as waste material despite their significant CaCO_(3) content,and have not been widely utilized in the synthesis of *** study aims to synthesize and analyze HA derived from crab shells using the hydrothermal method with different durations of holding *** study utilized precipitated calcium carbonate(PCC)derived from crab *** a hydrothermal reactor set at 160°C and varying holding times of 14(HA_14),16(HA_16),and 18(HA_18)h,a PCC and(NH4)2HPO4 mixture was used to synthesize *** synthesis results were analyzed using scanning electron microscopy(SEM),fourier transform infrared spectroscopy(FTIR),and X-ray diffraction(XRD)*** study has accomplished the synthesis of HA from crab ***,the final product of synthesis still contained CaCO_(3) as an *** prolonged hydrothermal holding time of 14 to 18 h resulted in a reduction of impurities while increasing the percentage of crystal weight and crystallite size of *** CH_18 is the best-quality product generated in this *** specimen produced HA with the highest percentage of crystal weight and crystallite size compared to the other ***,specimen CH_18 exhibited the lowest concentration of *** Ca/P ratio in this specimen was also the closest to *** Ca/P ratio,crystallite size,and crystal weight percentage of this specimen are 1.54,19.06 nm,and 99.1%,respectively.

关键词： Hydroxyapatite crab shells CaCO_(3) hydrothermal holding time

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Genotypic effects on accelerated propagation of oil palm breeding materials selected(Elaeis guineensis jacq.)using somatic embryogenesis

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Oil Crop Science 2024年第2期9卷 111-120页

作者： Retno Puji Astari Mohammad Basyuni Luthfi A.M. siregar Revandy I.M. Damanike Deni Arifiyanto Dadang Affandi Indra Syahputra Doctoral Program of Agricultural Sciences Faculty of AgricultureUniversitas Sumatera UtaraMedan20155North SumatraIndonesia PT.Socfin Indonesia Jl.K.L.Yos Sudarso No.106Medan20244North SumatraIndonesia Department of Forestry Faculty of ForestryUniversitas Sumatera UtaraJl.Tri Dharma Ujung No.1Medan20155North SumatraIndonesia Center of Excellence for Mangrove Universitas Sumatera UtaraMedan20155Indonesia Department of Agrotechnology Faculty of AgricultureUniversitas Sumatera UtaraMedan20155North SumatraIndonesia

Vegetable oil production from oil palm(Elaeis guineensis Jacq.)is an important industry due to the rising demand every *** somatic embryogenesis culture can propagate oil palm duplicate as parent plant,which can be selected as breeding material to produce new planting germplasm with high production or disease *** study aims to evaluate the genotypic effect of somatic embryogenesis,while immature leaflets were employed as *** culture used embryo induction medium based on Murashige and Skoog(MS)modifications that contained 5 mg/L Naphthalene Acetic acid(NAA)and 0.5 mg/L Benzyl Amino Purine(BAP).The genotypic effect was statistically significant in the percentage of callus induction,producing somatic embryos,and germination *** this study,we successfully cloned thirteen oil palm genotypes(GE-02,GE-03,GE-06,GE-07,GE-09,GE-23,GE-24,GE-27,GE-28,GE-32,GE-33,GE-34,and GE-35),with the highest number of somatic embryos formed on GE-27 with a percentage of 70.1%.The cloning was successful in accelerating the propagation of oil palm for materials breeding programs to create new varieties with high production and disease *** is necessary to observation the performance of these clones in the field in terms of mantle flower appearance.

关键词： Somatic embryogenesis Oil palm Genotypic effect Support breeding

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Seismic anisotropy and upper mantle dynamics in Alaska:A review of shear wave splitting analyses

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Earthquake Research Advances 2024年第2期4卷 72-81页

作者： Zhaofeng Jin Yuchen Yang Muhammad Ishaidir siregar Zihao Mu S.M.Ariful Islam Qichao Zhao Dan Wang Fan Zhang Xugang Yang Liwei Song School of Earth Sciences Northeast Petroleum UniversityDaqing163318China Department of Geoscience University of IndonesiaDepok16424Indonesia School of Computer and Information Technology Northeast Petroleum UniversityDaqing163318China Center for Earthquake Research and Information University of MemphisMemphis38152USA College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China School of Petroleum Engineering China University of PetroleumQingdao266555China School of Physics and Electronic Engineering Northeast Petroleum UniversityDaqing163318China

Shear wave splitting(SWS)is regarded as the most effective geophysical method to delineate mantle flow fields by detecting seismic azimuthal anisotropy in the earth's upper mantle,especially in tectonically active regions such as subduction *** Aleutian-Alaska subduction zone has a convergence rate of approximately 50 mm/yr,with a trench length reaching nearly 2800 *** a long subduction zone has led to intensive continental deformation and numerous strong earthquakes in southern and central Alaska,while northern Alaska is relatively *** sharp contrast makes Alaska a favorable locale to investigate the impact of subduction on mantle ***,the uniqueness of this subduction zone,including the unusual subducting type,varying slab geometry,and atypical magmatic activity and composition,has intrigued the curiosity of many *** identify different sources of seismic anisotropy beneath the Alaska region and probe the influence of a geometrically varying subducting slab on mantle dynamics,extensive SWS analyses have been conducted in the past ***,the insufficient station and azimuthal coverage,especially in early studies,not only led to some conflicting results but also strongly limited the in-depth investigation of layered anisotropy and the estimation of anisotropy *** the completion of the Transportable Array project in Alaska,recent studies have revealed more detailed mantle structures and characteristics based on the dense station coverage and newly collected massive seismic *** this study,we review significant regional-and continental-scale SWS studies in the Alaska region and conclude the mantle flow fields therein,to understand how a geometrically varying subducting slab alters the regional mantle *** summarized mantle flow mechanisms are believed to be conducive to the understanding of seismic anisotropy patterns in other subduction zones with a complicated tectonic setting.

关键词： Seismic anisotropy Shear wave splitting Mantle flow Alaska subduction zone Slab

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Overview of Jute Fibre as Thermoplastic Matrix Polymer Reinforcement

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Journal of Renewable Materials 2024年第3期12卷 457-483页

作者： Tezara Cionita Mohammad Hazim Mohamad Hamdan Januar Parlaungan siregar Deni Fajar Fitriyana Ramli Junid Wong Ling Shing Jamiluddin Jaafar Agustinus Purna Irawan Teuku Rihayat Rifky Ismail Athanasius Priharyoto Bayuseno Emilianus Jehadus Faculty of Engineering and Quantity Surveying INTI International UniversityNilaiNegeri Sembilan71800Malaysia Technical Department Dyna Forming Engineering Technology(DFETECH)SDN.BHD.SerembanNegeri Sembilan70300Malaysia Faculty of Mechanical and Automotive Engineering Technology UniversitiMalaysia Pahang Al-Sultan Abdullah(UMPSA)PekanPahang26600Malaysia Automotive Engineering Center(AEC) UniversitiMalaysia Pahang Al-Sultan Abdullah(UMPSA)PekanPahang26600Malaysia Department of Mechanical Engineering Universitas Negeri SemarangKampus SekaranGunungpatiSemarang50229Indonesia Faculty of Manufacturing and Mechatronic Engineering Technology Universiti Malaysia Pahang Al-Sultan AbdullahPekanPahang26600Malaysia Faculty of Health and Life Sciences INTI International UniversityNilai71800Malaysia Faculty of Mechanical and Manufacturing Engineering Universiti Tun Hussein Onn MalaysiaParit RajaBatu PahatJohor86400Malaysia Faculty of Engineering Universitas TarumanagaraJakarta Barat11440Indonesia Department of Chemical Engineering Politeknik Negeri LhokseumaweLhokseumawe24301Indonesia Department of Mechanical Engineering Faculty of EngineeringDiponegoro UniversitySemarang50275Indonesia Department of Mathematics Education Universitas Katolik Indonesia Santu Paulus RutengNusa Tenggara Timur8651Indonesia

Recent decades have seen a substantial increase in interest in research on natural fibres that is aligned with sustainable development goals(SDGs).Due to their renewable resources and biodegradability,natural fiberreinforced composites have been investigated as a sustainable alternative to synthetic materials to reduce the usage of hazardous waste and environmental *** the natural fibre,jute fibre obtained from a bast plant has an increasing trend in the application,especially as a reinforcement *** research works have been performed on jute fibre with regard to reinforced thermoset and thermoplastic ***,current demands on sustainable materials have required new developments in thermoplastic *** this paper,the author reviews jute plants as reinforcement materials for thermoplastic matrix *** review provides an overview of the sustainability of jute plants as reinforcement material for thermoplastic matrix *** overview on jute based thermoplastic composites focused on the thermal behavior and mechanical *** from physical,chemical,and mechanical properties,the study also covers the current and perspectives for future research challenges faced by the researchers on jute fibre reinforced thermoplastic composites.

关键词： Jute fibre sustainable development goals(SDGs) natural fibre thermoplastic composite sustainable manufacturing

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Effectiveness of ultrafine bubbles and gamma irradiation treatments to improve seed viability and vigor of Albizia chinensis(Osbeck)Merr.

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Journal of Forestry Research 2022年第5期33卷 1607-1613页

作者： Dede J.Sudrajat Anindyta Putri Y.Aris Purwanto Iskandar Z.siregar Forest Tree Seed Technology Research and Development Center Jl.Pakuan CiheuleutPO BOX 105BogorWest JavaIndonesia Department of Silviculture Faculty of Forestry and EnvironmentIPB UniversityJl.Lingkar Kampus DramagaBogor 16680West JavaIndonesia Department of Mechanical and Biosystem Engineering IPB UniversityJl.Lingkar Kampus DramagaBogor 16680West JavaIndonesia

Ultrafine bubbles and low doses of gamma irradiation had a positive effect on seed *** research tested the effectiveness of ultrafine bubbles(UFB)water and gamma irradiation for improving the viability and vigor of Albizia chinensis(Osbeck)*** that had been stored for four years.A completely randomized two-factor experiment,i.e.,UFB water and gamma irradiation treatments,were used to determine the best seed *** UFB water treatment had a significant effect on all seed germination parameters;the gamma irradiation treatment did not have a significant effect on improving the viability and vigor of the seeds,with a very low initial germination(11.7%).Soaking the seeds in UFB water for 30 min gave the best germination(51.3%).These improvements also occurred in other germination parameters such as germination rate,germination value,radicle length and vigor *** UFB water treatment has the potential to improve the germination of seeds with low physiological qualities.

关键词： Albizia chinensis Gamma rays Germination Ultrafine bubbles

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A model to standardize safety and quality of care for cupping therapy

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Journal of Integrative Medicine 2021年第4期19卷 327-332页

作者： Riska.siregar Aris Setyawan Syahruramdhani Syahruramdhani Lembaga Mitra Sehat Manfaat Relief-Health Partnership SocietySleman 55292Yogyakarta ProvinceIndonesia School of Nursing Institute of Health ScienceSurya Global YogyakartaBantul 55194Yogyakarta ProvinceIndonesia School of Nursing Universitas Muhammadiyah Yogyakarta ProvinceIndonesia

Cupping therapy has historical, traditional and religious value. It is increasingly popular in the field of complementary, alternative and integrative medicine. However, standards for safety and quality of service are absent. Although it is generally considered safe, cupping therapy can cause adverse *** of these events are predictable and preventable. A comprehensive approach to patient eligibility and therapist selection, along with compliance with standard operational procedures is essential to regulate the safety of the practice. Here we discuss a model framework for standardizing safety and quality of care. We recommend that this model be used routinely by cupping therapists and their associations on a nation-wide scale.

关键词： Cupping therapy Safety Theoretical models Practice management

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Identification of chemical compounds in agarwood-producing species Aquilaria malaccensis and Gyrinops versteegii

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Journal of Forestry Research 2020年第4期31卷 1371-1380页

作者： Arie Aqmarina Nasution Ulfah Juniarti siregar Miftahudin Maman Turjaman Graduate School of Tropical Silviculture Bogor Agricultural University(IPB)Bogor 16680Indonesia Department of Silviculture Faculty of ForestryBogor Agricultural University(IPB)Bogor 16680Indonesia Department of Biology Faculty of Mathematics and NaturalSciencesBogor Agricultural University(IPB)Bogor 16680Indonesia Forest Research and Development Center Environment and Forestry ResearchDevelopmentand Innovation Agency(FORDA)Ministry of Environment and ForestryBogorIndonesia

Agarwood is a non-timber forest product found in tropical rain *** is a black and fragrant resin valued for the perfume industry and demand continues to ***,the Indonesian agarwood-producing species,Aquilaria malaccensis and Gyrinops versteegii do not automatically produce such quality ***-induction technology or inoculation using Fusarium solani is usually applied to these species to trigger resin *** research aims to identify agarwood compounds formed in seedlings and trees of *** and *** after these species were inoculated with the fungus *** chemical compounds were identified by comparing the patterns of mass spectra fragmentation in the sample and in previous *** groups of agarwood compounds were identified:(1)sesquiterpen group-cisjasmone and aromadendrenepoxide;(2)chromones group-8-methoxy-2-(2-phenylethyl)chromen-4-one and newly-discovered chromone derivative,7-(benzyloxy)-5-hydroxy-2-methylchromone found only in ***;(3)aromatic group-benzylacetone,guaiacol,p-ethylguaiacol,phenol,syringaldehyde,vanilin,furfuryl alcohol,and furfural;(4)fatty acid group-palmitic acid,oleic acid,and lauric acid;and,(5)triterpen group-squalene.

关键词： Agarwood constituent Aquilaria malaccensis Fusarium solani Gyrinops versteegii

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Verification tests of a mirror box type artificial sky without and with building scale model

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Frontiers of Architectural Research 2018年第2期7卷 151-166页

作者： Rizki A. Mangkuto Mhd. Akbar Anthony siregar Laboratory of Building Physics and Acoustics Engineering Physics Research Group Institut Teknologi Bandung Jl. Ganesha 10 Labtek VI Bandung 40132 Indonesia

A mirror box type artificial sky for simulating the ClE standard overcast sky has been designed and constructed, while the verification method has been developed and tested. Ratio between the mirror height above the workplane and the room Length is 60：133 or 0.451, whereas the ratio between the mirror height above the workplane and the room width is 5：9 or 0.556. Taking the ClE standard overcast sky as reference, indoor illuminance ratios at various elevation angles relative to the zenith is found to be more consistent than Luminance ratios. The Largest error of illuminance and Luminance ratios are respectively 10% and 43%, obtained at O elevation angle. Horizontal workplane illuminance values are on average 11,400 lx, with iLLuminance uniformity Uo and UI of respectively 0.92 and 0.86. Based on test results with a building scale model, four out of nine measuring points inside the model have small errors, four have medium error, and one has a large error of 25%. Most of the obtained errors are within the tolerable range of ±21% from the ideal values. Based on the conducted tests, the constructed mirror box type artificial sky is considered appropriate to be utilised for its purpose.

关键词： Artificial sky Mirror Luminance Illuminance Building scale model Verification

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Effect of microwave treatment on tensile properties of sugar palm fibre reinforced thermoplastic polyurethane composites

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Defence Technology（防务技术） 2018年第4期14卷 287-290页

作者： A.A.Mohammed D.Bachtiar M.R.M.Rejab J.P.siregar Structural Materials and Degradation Focus Group Faculty of Mechanical EngineeringUniversity of Malaysia Pahang Materials Engineering Department University of TechnologyBaghdadIraq

The effect of microwave treatment on the tensile properties of treated sugar palm fibre with 6% NaOH reinforced thermoplastic polyurethane composites was investigated. Firstly, the sugar palm fibres were treated by 6% alkali solution. Then, microwave treatment was used to treat the alkali treated sugar palm fibres. Three types of temperatures(i.e. 70, 80 and 90℃) were applied in microwave treatment. The extruder and hot press machines were used to mixing the sugar palm fibres and polyurethane resin, and fabricate the composites. Tensile properties(i.e. tensile strength, tensile modulus and elongation at break) were studied by following the ASTM D-638 standard. The highest tensile strength was recorded 18.42 MPa with microwave temperature at 70℃ and 6% alkali pre-treatment. Therefore, the temperature 70℃ of microwave treatment may consider the best degree cent grate.

关键词： Tensile properties Sugar palm fibre Thermoplastic polyurethane Alkali treatment Microwave method

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