bluuebunny/crossref_metadata_2025 huggingface dataset:
Change Detection between Landsat 8 images and Sentinel-2 images
Authors: Abd-Alwahab Nawfal S. , Ghazal Nawal K.
Published: July 2021

The technology of change detection is a technique by which changes are verified in a certain time period. Remote sensing images are used to detect changes in agriculture land for the selected study area located south of Baghdad governorate in Agricultural Division of AL-Rasheed district because this method is very effective for assessing change compared to other traditional scanning techniques. In this research two remotely sensed images for the study area were taken by Landsat 8 and Sentinel-2, the difference between them is one month to monitor the change in the winter crops, especially the wheat crop, where the agriculture began for the wheat crop there in the Agricultural Division of AL-Rasheed district at 15/11/2018. The first preprocessing procedure was the extraction of the NDVI (Normalized Difference Vegetation Index) values for the two scenes of Landsat 8 and the two scenes of Sentinel-2B and then using the change detection between them to compare the changes in agriculture land. Also, change detection was implemented between NIR bands because they are most severely affected by biomass or the amount of available chlorophyll-containing in plant structures. The results of the change detection for Sentinel-2B were more accurate than for the Landsat 8 as demonstrated by field visits for the study area, where the changes in the distribution of vegetal cover (wheat and other winter crops) were clear and accurate in the image of Sentinel-2B, as opposed to Landsat's 8 image, where the variation in vegetation cover was not accurate, especially for the change detection between NIR bands.
Predicting the Depositional Environments of Mishrif Formation from Seismic Isopach Map in the Dujaila Oil Field, Southeast-Iraq
Authors: Khawaja Ahmed Muslim , Thabit Jassim Muhammad
Published: July 2021

In this paper, we attempt to predict the depositional environments with associated lithofacies of the main reservoir of the late Cretaceous Mishrif carbonate Formation, depending on the analysis of the created seismic isopach map by integrating seismic and well data. The isopach map was created from a 3D-seismic reflection survey carried out at the Dujaila oil field in southeastern Iraq, which is of an area of 602.26 Km2, and integrated with the data of the two explored wells. Based on the interpretation of the seismic isopach map, the diagram of the 3D-depositional environment model of Mishrif Formation was constructed. It showed three distinguished depositional environments, which were graduated from a back reef lithofacies of a shallow open marine (shelf) environment in the west and NW, to a shoal environment of isolated Rudist reefal buildup in the middle, and a fore reef lithofacies of the deep open marine basin environment in the SE of the field. A 3D-instantaneous frequency model was generated to verify the capability of the seismic isopach map of predicting the depositional environments, which in turn showed that the low frequency was restricted in the region of the high thickness of Rudist reefal buildups (porous reservoir facies) in the vicinity of the productive well Dujaila-1.
Association of Iron Status in Follicular Fluid with Pregnancy Outcomes in Infertile Women Undergoing IVF/ICSI
Authors: Kadhum Banan Salam , AL- Shammaree Shatha Abdul Wadood
Published: July 2021

Iron status may influence the outcome of infertile women under the intracytoplasmic sperm injection (ICSI) technique of in vitro fertilization (IVF). The aim of this study is to evaluate iron status and ceruloplasmin ferroxidase activity in the follicular fluid (FF) and their association with IVF outcomes. The study enrolled fertile women with male cause infertility (n=25), infertile women with polycystic ovary syndrome (PCOS; n=21), infertile women with low AMH level (n=26), and women with unexplained infertility (UI; n=27), all undergoing IVF/ICSI. On the day of oocyte suction, the selection of FF samples was accomplished. Iron, ferritin, and transferrin levels, as well as ceruloplasmin (CP) ferroxidase activity, were measured in the FF. In the PCOS group, iron showed significantly higher level (P<0.05) as compared to the control and UI groups. In the PCOS group, ferritin showed significantly higher level (P<0.05) compared with the control group. In the PCOS group, transferrin showed significantly higher level (P<0.05) when compared with the UI group. Also, Cp. ferroxidase activity in the PCOS group showed a lower level, but non-significant difference, compared with the other groups. In conclusion, the increased iron level in the follicular fluid of women with PCOS may lead to decrease pregnancy success after applying IVF protocol.
Toxoplasmosis and Its Potential Role to Change the Levels of C - reactive protein and Vitamin D3 in Atherosclerosis Patients
Authors: Musa Israa Salim , Saheb Entsar Jabbar , Kuba Rasha Hussain
Published: July 2021

Atherosclerosis is a condition of the hardening of a blood vessel via the development of plaques around the artery wall which causes the artery to narrow, leading to severe complications. Toxoplasmosis is an opportunistic parasitic infection that causes pathological complications in immunocompromised patients, which lead to increase the burden on the immune system in these patients. This study aims to assess the incidence rate of toxoplasmosis in atherosclerosis patients and its potential to change C - reactive protein (C-RP) and vitamin D3 levels. Serum samples (150) were tested for the positivity of anti-Toxoplasma IgG and IgM antibodies by means of Enzyme-linked immunosorbent assay (ELISA). In addition, C-RP was assessed in all serum samples by means of Latex Fixation Test, while VtD3 was estimated by MiniVidas device. The results revealed that the seroprevalence of toxoplasmosis in atherosclerotic patients was comparatively higher as compared to that in the control group, with significant differences in C-RP and VtD3 levels. These results suggest that the decreased levels of VD3 lead to increase the incidence of T. gondii infection in atherosclerosis patients.
Quality of Educational Service at the Faculty of Social Sciences and Humanities of a Public University
Authors: Cruz Neyra Lidia Luz , Toledo Espinoza Elías Saturnino , Mendonza Ramírez Arturo Jaime
Published: July 2021

The quality of the educational service is one of the factors that is present as the objective of every university institution and, therefore, the quality of training of professionals in Peru, both in its face-to-face and remote modality. The objective of the research was to determine the association of expectation and perception of the quality of educational service provided by the National University of Education. The selected exhibition consisted of 189 students from the Faculty of Social Sciences and Humanities. They responded to the survey based on the SERVQUAL model that measures the expectation of students of a university of excellence and the perception of educational service that is offered by the institution. The association between the two variables was evaluated through Spearman's Rho correlation. The results demonstrate a weak association of student expectation and perception variables at a significance level of 0.05. Likewise, these results are extended to the security dimension, in contrast to the other dimensions such as tangibility, responsiveness, empathy and reliability. This means that the gaps (P-E) that are the differences between perception (P) and Expectations (E) suggest that improvement plans must be implemented to obtain the quality of educational service that students demand.
INTERPOLASI SPLIN KUBIK PERIODIK
Authors: AMLIZA WIRA , SYAFWAN MAHDHIVAN , BAHRI SUSILA
Published: July 2021

Tulisan ini membahas tentang penurunan interpolasi splin kubik untuk kasus syarat batas periodik dengan lebar selang sebarang. Interpolasi jenis ini digunakan untuk menghampiri data yang memiliki sifat periodik dengan siklus tunggal. Dari hasil simulasi, diperoleh hasil interpolasi yang sangat baik dalam menghampiri data periodik.Kata Kunci: Interpolasi splin kubik, batas periodik
PEMODELAN FAKTOR-FAKTOR YANG MEMPENGARUHI STATUS DAERAH DI INDONESIA MENGGUNAKAN METODE REGRESI LOGISTIK BINER
Authors: FITRAH RIZKI , ASDI YUDIANTRI , MAIYASTRI MAIYASTRI
Published: July 2021

Status daerah dapat dikategorikan menjadi dua, yaitu daerah tertinggal dan daerah tidak tertinggal. Pada penelitian ini akan dianalisa faktor-faktor yang mempengaruhi status daerah di Indonesia. Analisis dilakukan dengan analisis regresi logitstik biner. Data yang digunakan pada penelitian ini adalah data dari Survei Sosial Ekonomi Nasional (SUSENAS) yang dilaksanakan oleh Badan Pusat Statistik (BPS) pada tahun 2018. Penelitian ini menggunakan empat variabel prediktor, yaitu persentase penduduk miskin, angka melek huruf, angka harapan hidup, dan jumlah puskesmas. Langkah awal dalam penelitian adalah membuat statistika deskriptif untuk variabel respon dan keempat variabel prediktor. Kemudian dilakukan analisis Regresi Logistik Biner untuk mengetahui model akhir. Analisis regresi logistik biner dilakukan dengan pengujian signifikansi parameter secara serentak dan parsial. Hasil dari pengujian signifikansi parameter menunjukkan bahwa dari keempat variabel prediktor, variabel persentase penduduk miskin, angka harapan hidup, dan jumlah puskesmas berpengaruh secara signifikan terhadap status daerah di Indonesia.Kata Kunci: Status daerah, regresi logistik biner
PENGGUNAAN METODE FUZZY C-MEANS UNTUK PENGELOMPOKAN PROVINSI DI INDONESIA BERDASARKAN INDIKATOR KESEHATAN LINGKUNGAN
Authors: WIJAYANTI WIDYA , RAHMI HG IZZATI , YANUAR FERRA
Published: July 2021

Analisis Klaster (cluster analisis) memiliki tujuan untuk mengelompokkan objek-objek berdasarkan karakteristik yang dimiliki. Pengelompokan dengan analisis klaster dibagi menjadi dua metode yaitu metode berhirarki dan metode tak berhirarki. Salah satu metode tak berhirarki adalah Metode Fuzzy C-Means. Metode Fuzzy C-Means merupakan suatu metode yang mempertimbangkan derajat keanggotaan dan himpunan fuzzy sebagai dasar pembobotan. Untuk jumlah klaster optimum didapatkan dengan menggunakan kriteria indeks validitas Partition Entropy Index (PE). Pada penelitian ini Metode Fuzzy C-Means digunakan untuk mengelompokan provinsi-provinsi yang ada di Indonesia berdasarkan indikator kesehatan lingkungan. Indikator kesehatan lingkungan yang digunakan adalah STBM, tatanan kawasan sehat, air minum layak rumah tangga, TTU yang memenuhi syarat kesehatan, TPM yang memenuhi syarat kesehatan, sanitasi layak rumah tangga dan rumah tangga layak huni. Jumlah klaster optimum diperoleh sebanyak 2 klaster yang memiliki nilai partition entropy 0,4633829. Klaster 1 terdiri dari 22 provinsi dan klaster 2 terdiri dari 12 provinsi.Kata Kunci: Fuzzy C-Means, Indikator Kesehatan Lingkungan, Partition Entropy Index
PENGELOMPOKAN KABUPATEN/KOTA DI SUMATERA BARAT BERDASARKAN FAKTOR TERKAIT KEJADIAN DEMAM BERDARAH DENGUE DENGAN METODE FUZZY SUBTRACTIVE CLUSTERING
Authors: DELIMAWATI SRI , YOZZA HAZMIRA , MAIYASTRI MAIYASTRI
Published: July 2021

. Demam berdarah dengue(DBD) adalah penyakit infeksi virus akut yang disebabkan oleh virus dengue. Provinsi Sumatera Barat merupakan salah satu provinsi di Indonesia yang memiliki angka penderita DBD cukup tinggi. Penelitian ini bertujuan untuk mengelompokkan kabupaten/kota di Sumatera Barat berdasarkan faktor terkait kejadian DBD yakni kejadian banjir, penampungan air, fasilitas dan tenaga kesehatan dan penduduk miskin. Metode yang digunakan dalam penelitian ini adalah metode fuzzy subtractive clustering(FSC). Berdasarkan pengolahan dengan metode FSC didapat hasil pengklasteran dengan 2 klaster , 4 klaster, 5 klaster, 7 klaster dan 8 klaster. Dari validitas klaster ditemukan jumlah klaster terbaik yaitu 7 klaster. Berdasarkan karakteristik klaster, secara umum klaster 4 merupakan klaster terbaik dibandingkan dengan klaster lainnya. Klaster 3, klaster 5 dan klaster 7 merupakan klaster terendah, sehingga pada klaster tersebut banyak indikator yang harus mendapat penanganan lebih supaya angka penderita DBD dapat berkurang.Kata Kunci: Demam Berdarah Dengue(DBD), Fuzzy Subtractive Clustering(FSC)
PELABELAN TOTAL SISI AJAIB SUPER PADA GRAF TERHUBUNG 3-REGULER
Authors: NGESTU SULISTIO ADE , YULIANTI LYRA , NARWEN NARWEN
Published: July 2021

. Suatu pelabelan total sisi ajaib pada graf G dengan p titik dan q sisi adalah suatu fungsi bijektif f : V (G) âˆª E(G) â†’ {1, 2, 3, Â· Â· Â· , p + q} sedemikian sehingga f(u) + f(v) + f(uv) = k, untuk setiap uv âˆˆ E(G) dengan k konstanta bilangan bulat positif. Suatu pelabelan total dikatakan sebagai pelabelan super jika f : V (G) â†’ {1, 2, 3, Â· Â· Â· , p}. Pada penulisan ini dikaji tentang pelabelan total sisi ajaib super pada graf terhubung 3-reguler.Kata Kunci: Pelabelan graf, graf reguler, pelabelan sisi ajaib super
PENGKLASTERAN PROVINSI-PROVINSI DI INDONESIA BERDASARKAN INDIKATOR YANG MEMPENGARUHI INDEKS PEMBANGUNAN MANUSIA MENGGUNAKAN METODE FUZZY C-MEANS
Authors: ARMETIYANA MARGARETTA DEBBY , RAHMI HG IZZATI , YOZZA HAZMIRA
Published: July 2021

Analisis klaster merupakan salah satu teknik dalam analisis peubah ganda yang bertujuan untuk mengklasterkan objek-objek berdasarkan kesamaan karakteristik yang dimilikinya. Pengklasteran dilakukan berdasarkan pada sifat kemiripan atau sifat ketidakmiripan antar objek. Pada penelitian ini untuk mengklaster provinsi-provinsi di Indonesia berdasarkan faktor-faktor yang diduga mempengaruhi Indeks Pembangunan Manusia (IPM) digunakan salah satu metode dalam fuzzy clustering yaitu fuzzy c-means. Fuzzy c-means adalah suatu teknik pengklasteran data dimana keberadaan tiap-tiap titik data dalam klaster ditentukan oleh derajat keanggotaan. Berdasarkan hasil pengklasteran menggunakan fuzzy c-means diperoleh pengklasteran provinsi-provinsi di Indonesia sebanyak empat klaster, dimana klaster pertama terdiri atas 6 provinsi, klaster kedua terdiri atas 2 provinsi, klaster ketiga terdiri atas 12 provinsi, dan klaster keempat terdiri atas 14 provinsi. Berdasarkan karakteristik klaster, klaster pertama dikatakan klaster terbaik karena rata-rata pencapaian setiap indikatornya tinggi sedangkan klaster kedua merupakan klaster terendah dibanding klaster lainnya. KataKunci: klaster, Indeks Pembangunan Manusia, Fuzzy C-Means
KONGRUENSI DAN DIAGONALISASI BENTUK BILINIER SIMETRIS
Authors: HIDAYATUL ULYA DINDA , NAZRA ADMI , RIANTI HELMI MONIKA
Published: July 2021

Misalkan (, ) : V Ã— V â†’ F merupakan suatu bentuk bilinier, dengan V adalah suatu ruang vektor atas lapangan F yang memenuhi untuk setiap ~u, ~v, ~w anggota V dan k anggota F memenuhi (~u + ~v, ~w)=(~u, ~w)+(~v, ~w), (~u, ~v + ~w)=(~u, ~v)+(~u, ~w) dan (k~u, ~w)=k(~u, ~w)=(~u, k ~w). Setiap Bentuk bilinier berkaitan dengan sebuah matriks tunggal. Matriks yang berkaitan adalah simetris apabila bentuk biliniernya juga simetris. penelitian ini akan membuktikan bahwa ada suatu basis terurut B untuk ruang vektor V atas lapangan F, dimana F mempunyai karakteristik tidak sama dengan dua, sehingga matriks simetris yang bersesuaian dengan B dan berkaitan dengan bilinier (, ) adalah diagonal.Kata Kunci: Bentuk bilinier, matriks simetris, matriks diagonal
GRAF KOPRIMA DARI SUBGRUP DI GRUP SIMETRI
Authors: ALKADAR REFI , YANITA YANITA , WELYYANTI DES
Published: July 2021

Perkembangan studi tentang keterkaitan antara struktur aljabar dengan teori graf telah membuahkan banyak hasil, salah satunya adalah graf koprima. Misalkan TG adalah graf koprima dari grup berhingga G. Himpunan titik dari TG adalah semua unsur dari grup G, dan dua titik yang berbeda x, y di G dikatakan bertetangga jika dan hanya jika f pb(|x|, |y|) = 1. Pada makalah ini akan ditentukan karakteristik graf koprima dari subgrup di grup simetri. Metode yang digunakan adalah studi literatur dan analisis dilakukan dengan melihat pola graf koprima yang dibangun dari semua subgrup di grup simetri-n dengan 2 â‰¤ n â‰¤ 4. Adapun hasil yang diperoleh adalah setiap subgrup yang berorde hasil perkalian dari dua bilangan prima yang berbeda membentuk graf 3-partit lengkap, dan setiap subgrup yang memiliki unsur-unsur berorde sama atau kelipatannya membentuk graf bintang.Kata Kunci: Graf Koprima, Grup Simetri
Three-Dimensional Surface Evaluation and Shear Bond Strength of Three Pre-treatment E-max Surfaces for Metal and Ceramic Orthodontic Brackets
Authors: Mohammed Huda A. , Ali Omar S.
Published: July 2021

3D evaluation and shear bond strength (SBS) for metal and ceramic brackets after three pre-treatment surfaces of lithium disilicate (LD) crowns. Sixty lithium disilicate (LD) crowns were fabricated in laboratory according to manufacturer instruction and then divided into six groups (three groups for metal brackets and three groups for ceramic one). The 1st group for both was treated with round diamond bur, the 2nd one by hydrofluoric acid (HFA) 9.0%, and the 3rd group by laser (Er,Cr:YSGG). All treated surfaces were examined by laser profilometer and scan electron microscope. The Scotchbond Universal Adhesive and Transbond XT were used for bracketing procedure for metal and ceramic bracket (central incisor, 0,022” slot). Universal testing machine was used for shear bond. A crosshead speed of 1 mm/min was used, and the maximum load necessary to deboned the bracket will be recorded. HFA treated surfaces gave a highest SBS for both metal and ceramic brackets, then laser and finally the bur. The lowest roughness parameter Sa (arithmetical mean height) was in bur, both laser and HFA gave no significant differences. The HFA gave a highest Sz (maximum height) and Spc (arithmetic mean peak curvature) value. To increase the shear bond strength, the HFA is one of the best methods for roughness although the laser gave nearby roughness parameters. Ceramic brackets gave higher SBS than metal one with all pre-treatment procedures.
Optimalisasi Head Truck Maintenance untuk Meningkatkan Availability dan Reliability di PT. TPS
Authors: Kawasugi Regiyan Drinin , Sari Devina Puspita , Praharsi Yugowati
Published: July 2021

PT TPS Surabaya is a company engaged in terminal handling, especially containers. In carrying out operational activities to transport containers from the dock to the company's container yard, it uses eighty head truck fleets. Operational activities for transporting containers are carried out 24 hours a day so that maintenance is needed. Therefore, the operational head trucks do not experience sudden damage and disrupt operations. The malfunction of the device can occur due to damage to the components in the device. The design of the component replacement and the inspection intervals on the components is needed to avoid sudden component damage. Calculation of interval replacement and component checking is done by calculating the damage distribution followed by searching for index of fit and goodness of fit using Minitab software. The result showed that the inspection time interval of 1091 hours for the air system and 398.45 hours for the transmission system components. Besides, the replacement time interval for the component of the air system is 62 hours and the transmission system is 124 hours after inspection.
Identifikasi Penanganan Kembali Produk Elektronik Rumah Tangga
Authors: Herdiani Leni , Rohimat R. Ismet , Nurwathi Nurwathi , Munandar Ahmad
Published: July 2021

Reverse logistics is an item management activity that is no longer used by consumers or goods in the form of return from partners in the supply chain to be returned to the origin, because the product is unfunctional properly or the function of the item is not needed. Home appliances products within a certain period of time, these products must be replaced because they cannot technically function properly. The process of producing, using, and disposing of electronic products has an impact on the environment of the earth and the universe. If electronic waste is left without a policy to process it, there will be a buildup of electronic waste everywhere and will burden the environment. While this electronic product waste still contains economic value that can still be utilized. Therefore it is necessary to identify electronic waste handling activities, namely those that have material flow characteristics from the customer to the producer (reverse logistics), so as to provide added value.
A Survey of the Thickness of the Shoe Sole among Junior High School Students in Greater Jakarta for Shoe Correction in Seat Height-Popliteal Height Equation
Authors: . Yanto
Published: July 2021

This paper aimed to present a survey result of the thickness of the shoe sole among junior high school students in Greater Jakarta, Indonesia. A number of 160 samples of the shoe wearing by junior high school students (85 boys and 65 girls) from Grade 7-Grade 9 was measured. The thickness of the sole of the shoe wearing by them were measured. The results were presented in mean and SD for each grade and gender. T-test results showed that no significant differences were found for thickness of the sole of the shoe wearing by boys and girls within the same grade. Anova test results also revealed that no significant differences were found for thickness of the sole of the shoe among boys in Grade 7-9 (F=0.54, p=0.58) and girls (F=1.06, p=0.35). Findings in this study revealed that a 20mm shoe correction, as often used by many researchers, which is added to the popliteal height to dimension the seat height (SH) is appropriate to be used for population under study. The results of this study provided sufficient justification for the use of a 2 cm shoe correction (SC) in addition to popliteal height when determining seat height of the chair.
Analisis Kepuasan Pelayanan dan Faktor yang Mempengaruhi Keputusan Pelanggan untuk Memilih Smartphone Samsung di Jabodetabek Menggunakan Metode IPA dan Model Kano
Authors: V Marsellinus Bachtiar , . Cassidy
Published: July 2021

Smartphones are one of the must-have devices for modern society today. With the high demand for smartphones lately, many companies are competing to produce smartphones that suit consumer needs. Indonesia is one of the developing countries where the growth rate of smartphone use can still increase so that many smartphone manufacturers sell their products to Indonesia. From this phenomenon, researchers want to know the level of satisfaction of users of one of the leading smartphone brands in Indonesia and even in the world, namely Samsung. The purpose of this study is to determine what factors are considered good by customers and the company must maintain these services and what things are deemed not good and need to be improved again. This study uses the IPA method to determine the level of conformity between company services and customer expectations and the Kano model used to determine which services are included in the performance, basic, or delighter categories. From the results of these two methods can be integrated using the IPA-Kano integration table. Some things that still need to be improved from Samsung smartphones according to users who have filled out this questionnaire include good quality materials at a good selling price, attractive and modern product designs, product quality has a good price level, sufficient camera quality for purposes daily needs, and bonuses that make consumers satisfied.
Regional Data Center (RDC) of FSUE «TINRO-centre»: its role in prediction of resource state for national fisheries and principal directions of activities
Authors: Volvenko Igor V.
Published: July 2021

Regional Data Center (RDC) is 40 years old in 2014. Its main goals are accumulation of research data on Far-Eastern marine biological resources and their environments, as well as supervision for the data collection, validation and processing. Principal activities of RDC are: 1) development and implementation of computerize workplaces for scientific and technical personnel aboard research vessels and ashore; 2) logging of primary cruise materials on paper and their digitizing; 3) development and management of large databases (DB) for the information gathered in research cruises and fishery statistics; 4) creation of knowledge bases and geographic information systems (GIS) containing the processed results on long-term monitoring of marine ecosystems; 5 ) performing any user queries to the DB and GIS for quick information support of current scientific, practical and administrative activities in all departments of TINRO; 6) development of new methodological approaches to data processing and automation of related processes by creation of original software; 7 ) inter-institutional data exchange and creation of joint DB; 8) TINRO staff consulting on methodological issues of statistical and cartographic data processing; 9) development of regulations and normative documents regulating relationships in collection, storage and access to the information archived in RDC; 10) scientific researches, independent or joint with other laboratories. These ten trends are focused onto studies of marine ecosystems and their climatic and oceanographic environments, short-term and long-term forecasting of bioresources, rational management of fisheries and aquaculture, planning of research expeditions.
Hexachlorocyclohexane and DDT in marine organisms from the Bering and the Okhotsk Seas
Authors: Tsygankov Vasily Yu. , Boyarova Margarita D. , Lukyanova Olga N. , Khristoforova Nadezhda K.
Published: July 2021

Organochlorine pesticides (HCHs and DDT) are harmful and toxic substances affected biota. HCHs and DDT are still used as pesticides in the Southern Hemisphere and from there can reach the North Pacific due to atmospheric transfer. Isomers of HCH and DDT and their metabolites were detected in organs of some marine mammals ( Eschrichtius robustus, Odobenus rosmarus divergens ) from the Bering Sea; the maximum concentration was found in the walrus liver (90263 ng/g lipids). To trace these pollutants spreading in the Okhotsk Sea, the seabirds (Pacific gull Larus schistisagus, crested auklet Aethia cristatella, auklet crumb Aethia pusilla, northern fulmar Fulmarus glacialis, and grey petrel Oceanodroma furcata ) and fishes (pink salmon Oncorhynchus gorbusсha and chum salmon Oncorhynchus keta ) were sampled; the pesticides concentration in the birds tissues ranges from 29 ng/g lipids in plume of the fulmar to 16095 ng/g lipids in plume and skin of the auklet and in the salmons tissues - from 220-330 ng/g lipids for the pink salmon to 550-790 ng/g lipids for the chum salmon (both fish species were caught at Kuril Islands).
The Commander population of sea otter Enhydra lutris: history of exploitation and recovery, evaluation of modern state
Authors: Zagrebelniy Sergej V.
Published: July 2021

Demographic processes within the groups of sea otter on Commander Islands (Bering and Medny Islands) are described for the period from the beginning of its recovery on Bering Island in the late 1970s. Mortality rate is proposed as an indicator of this population condition. Stable spatial and age-sex structure of sea otter on Bering Island is observed since 1999 that is accompanied by high mortality among mature animals (8 years old and elder). Density of the sea otter distribution in the coastal waters is estimated from the data on findings of dead animals. Age-sex structure of the population varies between the sites and has seasonal variation. Strained feeding conditions for the sea otter on Bering Island are defined on the materials of underwater survey conducted by the USA researchers in 2008-2009. Three ways of development are proposed for the Commander population of sea otter.
State of the Kozmin and Wrangel Bays (Peter the Great Bay, Japan Sea): dynamics of pollution with heavy metals
Authors: Khristoforova Nadezhda K. , Gamayunova Olga A. , Afanasyev Andrey P.
Published: July 2021

Pollution with heavy metals, as iron, manganese, zinc, copper, lead, nickel, and cadmium is considered for the coastal waters in two bights of Peter the Great Bay on the data of the metals content in tissues of the algae Sargassum miyabei and Saccharina japonica . The Fe and Mn indicate terrigenous runoff, the Zn and Cu - anthropogenic impact, and the Pb, Ni, and Cd are the tracers of industrial pollution. The content of Fe is the highest among heavy metals; its maximum concentrations are found in the top of the Kozmin Bay and at Cape Petrovsky in the Wrangel Bay. The Pb and Cd contents are higher at the small boats berthing in the Kozmin Bay. The Ni content is the highest (up to 4 mg/g) on reefs in front of the oil terminal in the Wrangel Bay and in the top of the Kozmin Bay that is possibly reasoned by shipping activity because Ni is included in all oils. The Zn concentration is the highest at the pier in the Wrangel Bay constructed of stone blocks. The contents of heavy metals in algae from these bights are compared with similar data from the Avachinsky Bay (Kamchatka), Nha-Trang Bay (Vietnam) and port Santos (Brazil); relatively high pollution of the Kozmin and Wrangel Bays by Pb is revealed. Pollution in these bights has mostly industrial and anthropogenic nature. The pollution with Ni and Cd decreased between 1995 and 2008, but became higher again in 2012-2013, the pollution with Mn, Zn and Fe also increased in 2012-2013.
Age and length-weight structure of local stocks of sockeye salmon Oncorhynchus nerka in some feeding-spawning lakes of Kamchatka Region
Authors: Bugaev Alexander V. , Bugaev Victor F. , Pogodaev Evgeny G.
Published: July 2021

Age and length-weight structure of sockeye salmon spawners are considered for the feeding-spawning lakes of southeastern Kamchatka, as Dalneye (1976-2013), Blizhneye (1939-2013), and Listvenichnoye (1999-2013), and for Lake Sarannoye on Bering Island (1990-2013). By these data, the age of sockeye salmon maturing is: 2.2, 2.3 and 3.2 in Lake Dalneye, 1.2, 1.3, 2.1 and 2.2 in Lake Blizheye, 2.2, 2.3 and 3.3 in Lake Listvenichnoye, and 2.2, 2.3, 3.2 and 3.3 in Lake Sarannoye. These age groups dominate in the samples of spawning sockeye with the portion 70-90 %. Long-term dynamics of length and weight of sockeye spawners is distinguished by negative trends significant for the longest time-series in Lake Blizhneye and insignificant for the shorter one in Lakes Dalneye; the length of observations in Lakes Listvenichnoye and Sarannoye is not enough to reveal trends. Besides, cyclic variations with the period 5-10 years could be revealed for the long tome-series. As a rule, each cycle includes the phases of gradual decreasing and sharp increasing of length and weight. Year-to-year dynamics of the length-weight structure in the common period of observations is similar for all investigated lakes.
Investigation of chemical composition, biological value and safety of walleye pollock Theragra chalcogramma from Peter the Great Bay
Authors: Kupina Natalia M. , Bashtovoy Alexander N. , Pavel Konstantin G.
Published: July 2021

Data on chemical composition, biological value and safety are presented for muscle tissue and internal organs of walleye pollock Theragra chalcogramma caught in Peter the Great Bay (Japan Sea). The meat of рollock in any biological state has high protein content (15.5-16.8 %), low fat content (0.5-0.6 %), and low energy value (66-72 kcal./kg). The viscera of feeding pollock have in 25.0 % higher content of fat and in 3.5 % lower content of protein in compare with the spawning fish. Proteins in the pollock meat have more essential amino acids than a reference FAO/WHO protein and contain biologically active taurine and anserine, as well; the content of proteinogenic amino acids, taurine and anserine does not change in the process of storage. Lipids of the pollock viscera contain 37 % of polyunsaturated fatty acids, and 67.0 % of them are DHA (22:5) and EPA (20:50); content of these fatty acids in the lipids of pollock meat is even higher: 50 % and 86 %, respectively. The pollock caught at the coast of Primorye is safe by content of toxic elements and pesticides in its muscle tissue and internal organs.
State regulation of business activity in fishery of Republic of Korea
Authors: She Son Gun
Published: July 2021

Modern methods of state regulation of business activity in fishery of Republic of Korea are investigated, its efficiency is evaluated. The South Korean approaches to regulation of small business are compared with this practice in Russia. Korean creative approach to the state regulation of small business allows to use more effectively the limited resources and to increase their value added by means of the coastal regions involvement to the domestic and international tourist industry.
Computer modeling of rectangular-cylindrical trawl doors
Authors: Gabruk Victor I. , Kornienko Ivan A. , Kudakaev Vasily V. , Zhigulskaya Svetlana V. , Frankovskaya Kseniya G.
Published: July 2021

Computer modeling of the rectangular-cylindrical trawl doors designed by P.P. Augulis (project 2490) is realized for calculation of their parameters to ensure stable functioning in the process of trawling. Correct choice of the warp point ensures stable functioning of the door for three ways of fastening: directly to the stringer or by means of horizontal strap or bail.
Macrobenthos of the intertidal zone in the Gizhiginskaya Guba and Yamskaya Guba (Shelikhov Bay, Okhotsk Sea)
Authors: Ivanova Maria B. , Tsurpalo Alexandra P.
Published: July 2021

The intertidal zone of the Gizhiginskaya Guba and Yamskaya Guba inlets located in the Shelikhov Bay is surveyed and 179 species are found in its macrobenthos (66 plants and 113 animals). They form 25 communities, including 7 ones on soft bottom sediments, 12 - on hard substrates, and 6 transitional (mixed) communities. The community of Lyonsia cucumerina is endemic of the Shelikhov Bay, it occupies the mixed substrate, namely flat rocks covered with silty sand that occur in the Gizhiginskaya Guba and at Ust’-Palana.
Comparative description of brown algae from the coastal zone of Far East
Authors: Aminina Natalia M.
Published: July 2021

Data on stock and distribution of commercial and prospective for harvesting brown algae at the coast of Russian Far East are presented and compared. Their total biomass in the traditional harvesting grounds prevails 3.5 million tons. Saccharina japonica, Saccharina gurjanovae, Cystoseira crassipes have the highest biomass. However, taking into account both the stock and chemical composition of the tissues, Saccharina bongardiana, Arthrothamnus bifidus, and Eualaria fistulosa are the most profitable for harvesting and processing. The algae from the coastal waters of south-western Sakhalin have generally higher content of valuable proteins and minerals, but the content of mannitol and alginic acid is higher in the algae from the coastal waters of Kamchatka and Primorye. Contamination of the algae by toxic elements is considered, as well: in general, the safety indicators allow to regard all basic harvesting grounds of brown algae in the Far Eastern waters as suitable for commercial exploitation, though insignificant excess of the permissible level of lead (0.5 mg/kg) is detected for the brown algae from the coastal waters of Primorye and several sites in the Aniva Bay (southern Sakhalin).
Fecundity of northern shrimp Pandalus borealis dwelling at the west coast of Kamchatka
Authors: Mikhailova Oksana G. , Ivanov Pavel Yu.
Published: July 2021

Fecundity of northern shrimp Pandalus borealis is investigated for the first time on the data collected from the depth 200-400 m near the coast of West Kamchatka in 2013-2014. The absolute and relative individual fecundity are determined, their relationship with size and age of the shrimp is analyzed. The individual fertility of females changes in limits of 1395-4648 eggs, with average number in the laying 2799 ± 190 eggs. The maximum fecundity is noted for females at the age of 7+. Losses of eggs for the northern shrimp at the west coast of Kamchatka don’t exceed 12 %.
Species composition of macrozoobenthos in lagoons of Sakhalin Island
Authors: Labay Vjacheslav S.
Published: July 2021

Species composition of macrozoobenthos in lagoons of Sakhalin Island (in total, 637 species) is described on the base of cited data and results of author’s surveys. Its species composition is formed under influence of wide spectrum of environmental factors, as size of lagoon, water salinity, periodicity of connection with the sea and type of the water exchange, river discharge regime, climatic and geographical isolation, etc. Generally, 6 types of lagoons are determined on the coast of Sakhalin differed by composition of benthic fauna: 1) large semiclosed salty lagoon (Lake Busse in southern Sakhalin); 2) small semiclosed salty lagoons with water stratification and periodic connection with the sea (Lake Izmenchivoe and Lake Ptichye in southern Sakhalin); 3) large shallow semiclosed lagoons (in northern Sakhalin); 4) small isolated brackish lagoon (Kuegda Bay in northern Sakhalin); 5) closed oligosaline lagoons (Lake Tunaicha and Lake Aynskoe in southern Sakhalin); 5) isolated freshwater lagoons (Vavaysko-Chibisanskaya lake system in southern Sakhalin). Salty and freshwater lagoons are distinguished by the highest species diversity.
Role of downwelling/upwelling in formation/destruction of hypoxia in the bottom waters of the Amur Bay (Japan Sea)
Authors: Tishchenko Petr P. , Tishchenko Pavel Ya. , Lobanov Vyacheslav B. , Sergeev Alexander F. , Semkin Pavel Yu.
Published: July 2021

Downwelling/upwelling influence on hypoxia at the bottom of the Amur Bay is determined on the data of oceanographic surveys conducted aboard RV Impulse in August 2012 and RV Malachite in August 2013 coupled with the data of monitoring oceanographic station in the bay. The hypoxia develops in the period of downwelling circulation driven by southern and southeastern winds and relaxes in conditions of upwelling induced by northern and northwestern winds.
To substantiation the minimum fishing length for Lycodes soldatovi (Zoarcidae)
Authors: Badaev Oleg Z. , Savin Andrey B. , Ermakov Yury K. , Sheibak Olga V.
Published: July 2021

Lycodes soldatovi is one of the dominant mezobental fish species in the Okhotsk Sea, it has a commercial value. The minimal length for its sustainable fishery is defined on the base of mass measurements of 12075 ind., biological analysis of 3993 ind., and age determination for 628 ind. Its maximal registered length is 83 cm, the length of mass maturation is about 57 cm. The latter can be considered as the fishing length limit. Landings of L. soldatovi are low and do not affect negatively on the population, so any restrictive measures aren’t required yet.
Dynamics of biological parameters of spawners of pacific salmons returned to the rivers of the Avachinsky Bay (south-eastern Kamchatka) in 1989-2014
Authors: Zaporozhets Oleg M. , Zaporozhets Galina V. , Zorbidi Zhanna Kh.
Published: July 2021

Dynamics of biological parameters for adults of chum, sockeye, pink, coho, and chinook salmons in the rivers of the Avachinsky Bay is analyzed. There is shown for three populations of sockeye salmon that general age of the returned adults correlates positively with duration of their fresh-water life but negatively with timing of their approach for spawning. Tendency to decreasing of weight is revealed for chinook females, but weight of their males is stable. Dynamics of weight and timing of spawning run is significantly different for pink and chum salmons of the rivers Avacha and Nalycheva. Weight of coho females has negative trend, in spite of stable fecundity and age of return.
On state of understanding for bioresources of Antarctic, their status and commercial using
Authors: Petrov Andrey F.
Published: July 2021

Modern state of biological resources in Antarctic is considered using comprehensive systemic analysis of historical and present data of Russian and international fisheries researches, catch data, scientific observations made by Russia and other CCAMLR countries, and materials from CCAMLR database. Distribution and abundance of krill and toothfish is presented for the main fishing grounds in 2013-2014. Legal treatment is given for current and projected state of the bioresources accessible for Russian fishery. Scientific recommendations for rational exploitation of the resources by Russian fishing fleet are presented for the season of 2014/15 and further.
Modern state of bottom and demersal fish resources in the Russian waters of the Japan Sea
Authors: Kalchugin Pavel V. , Boyko Maxim I. , Solomatov Sergey F. , Chernienko Emilia P.
Published: July 2021

Results of the bottom trawl survey conducted over the shelf and continental slope in the Russian waters of the Japan Sea from Peter the Great Bay to the Soya Strait in the period from March 31 to July 8, 2015 are presented. Species composition, biomass and spatial and bathymetric distribution of benthic and demersal fish are determined. Bulk of the biomass (> 90 %) was formed by 4 families: gadids, flounders, sculpins, and herrings. The species structure varied considerably by areas: pollock and plain sculpin dominated in Peter the Great Bay, pollock and sealyeye plaice - at southern Primorye beyond the Bay, herring - at northern Primorye, and sealyeye plaice and longsnout flounder - at southwestern Sakhalin. The highest density of distribution was recorded in Peter the Great Bay at the depths 500-700 m - 26.8 t/km², with domination of pollock, the lowest density was at southern Primorye in the depth range of 700-800 m - 2.4 t/km² with domination of sealyeye plaice. Peter the Great Bay was surveyed in conditions of winter distribution of fish distinguished by their high concentrations at the continental slope; their shift towards lower depths was observed at Primorye coast, and almost summer type of bathymetric distribution with the high concentrations on the shelf was found at southwestern Sakhalin. The biomass of benthic and demersal fish has increased slightly in compare with the 1980-1990s.
Expert method for differentiation of chub mackerel (Scomber japonicus) and blue mackerel (S. australasicus) in catches
Authors: Milovankin Pavel G. , Somov Aleksey A.
Published: July 2021

Only one diagnostic sign is enough for differentiation of chub mackerel Scomber japonicus and blue mackerel S. australasicus working with mass material. It is a number of spines in dorsal fin: chub mackerel has 9-10 (often 9) and blue mackerel has 11-12 spines. Species identification may be done by relative distance between the spines: it is larger by half for chub mackerel. The species differ well by coloration of dorsal side: blue mackerel has «marbled» pattern with thin lines, in contrast to chub mackerel that has «zebra» pattern with thick lines.
Seasonal characteristic of gonadogenesis for the sea cucumber Apostichopus japonicus Selenka
Authors: Matrosova Inga V. , Evdokimov Vladimir V.
Published: July 2021

Gonads of females and males of the sea cucumber Apostichopus japonicus were collected along Primorye coast of the Japan Sea (bays Kiyevka, Sokolovskaya, Melkovodnaya, Sredniaya, and the area between Cape Genbachev and Cape DeLivron) in different seasons from May to October, 2011. The gonads were fixed in 70 % alcohol and Buena fixing agent, using Isoprep and Histomix, and subjected to histophyisiological analysis. Sex of the animals and condition of their gonads were defined visually and on histological preparations. Their whole bodies, skin and muscular bags, and sexual glands were weighted, gonad-somatic indices were calculated, dynamics of cellular composition was traced for the sex glands, timing of spawning and duration of the rest stage were determined. For the cucumbers from the Kiyevka and Melkovodnaya Bays, diameter of sex tubules varied from 0.2 mm to 1.9 mm, diameter of freely lying oocytes - from 71.4 mm to 167.0 mm, and diameter of wall oocytes - from 47.6 mm to 119.0 mm; they were ready for spawning in late July - early August, and spawned in the first 10-days of August. Plication of the tubule walls internal surface was observed later in the process of mature cells resorption in sex tubules; new generation of the cells appeared, which most likely would undergo to further destruction (small tubules with plication of their walls were observed for a specimen from the Kiyevka Bay in late September, 2011). New gametogenesis was registered both for females (small oocytes) and males (spermatocytes of I and II orders) from the Sredniaya Bay and between Cape Genbachev and Cape DeLivron in early October, simultaneously with continuing process of the tubule walls plication. The rest stage (without forming of new sex tubules) continued 1.0-1.5 months: from early August to middle September, with some variations between the areas.
Relevance of using the equipment for control of fishing gear to reduce inaccuracy in evaluation of marine organisms abundance
Authors: Zakharov Egor A. , Emelin Pavel O.
Published: July 2021

Geometric parameters of the bottom trawl DT 27.1/24.4 were tested aboard RV TINRO in the Bering Sea using the acoustic equipment «Scanmar» (Norway). Possible errors in the estimates of marine organisms abundance by bottom trawl survey are calculated for different species by comparing the actual data on the trawl geometry with the fixed constant value of its horizontal opening. The obtained data can be used for evaluation of the hauled area in bottom trawl surveys.
Automated hydraulic systems for transport of fish from fishing gears with vacuum fishpump
Authors: Kudakaev Vasily V. , Karpelev Timofey P. , Boitsov Anatoly N.
Published: July 2021

New techniques of fish tranport from fishing gears aboard is proposed for a case of mixed aggregations of chub mackerel and japanese sardine. These species resume their mass migration to the Russian waters since 2014. Submersible impeller pumps with hydraulic power drive are used usually for catch transport aboard in the world practice of purse seining of mackerel. However, this technique is unsuitable for mixed aggregations of mackerel and sardine because the impeller pump could damage the sardine. Applicability of the vacuum and waterjet pumps for this case is considered. The vacuum fish pump TransVac was designed in 1982, initially for transfer of damage-sensitive fish from fishing vessel to shore fish processing plant, and the waterjet fish pump SilkStream was designed in 1988 for transfer of alive fish and later was adapted for fish transport aboard from trawl and seine nets. Both types of fish pumps are recommended for the medium- and large-capacity fishing vessels working with the mixed aggregations of sardine and mackerel. Using of these pumps together with freezing equipment allows to avoid losses in quality of catch.
On rare for the Primorye waters species of mackerel Scomberomorus niphonius (Cuvier, 1832)
Authors: Dolganov Vladimir N.
Published: July 2021

Description of the mackerel Scomberomorus niphonius caught in the Vityaz Bay (Peter the Great Bay, Japan Sea) on September 19, 2015.
Underwater observations on fish behavior to determine the coefficient of catchability for Danish seine
Authors: Roy Ivan V.
Published: July 2021

Underwater observations were conducted to assess the impact of the research Danish seine elements on behavior of walleye pollock Theragra chalcogramma in its active zone. The underwater video equipment was installed on specially designed and constructed experimental platform and on elements of the Danish seine. In the experiment with pollock, the experimental platform demonstrated its low efficiency, however, it could be used for observations on sedentary benthic organisms on homogeneous soils without sharp changes in the terrain. With the equipment installed directly on the Danish seine, high efficiency of the seine ropes was observed: up to 92 % of fish from encircled volume remained in the towed area. Taking into account this estimation and features of fish biomass distribution, the coefficient of catchability for Danish seine is determined as 0.40 ± 0.15.