RECRUITMENT PATTERN, PROBABILITY OF CAPTURE AND PREDICTED YIELDS OF TILAPIA ZILLII IN OGUN ESTUARY, NIGERIA

A study was carried out on the stock parameters, recruitment pattern, and probability of capture of T. zillii in Ogun estuary, Ogun State, Nigeria using length-frequency and catch-at-length data. The fish stock was assessed using the methods of ELEFAN 0- III of the FiSAT II software. Results showed that the stock has a continuous recruitment pattern. L25, L50 and L75 were 13.82cm, 15.50cm and 17.19cm respectively. Fish population decreased with increase length class. Average mortality rate was 1.16/year, and exploitation rates were lower in length class 11-12cm to 26-27cm and large size, 34-35cm, and equal or greater than optimum in others. Steady biomass also increased with length class until 24-25cm. The fishery would attain MSY if the present effort level is raised by 1.6.Â

VGDRA: A Virtual Grid-Based Dynamic Routes Adjustment Scheme for Mobile Sink-Based Wireless Sensor Networks

In wireless sensor networks, exploiting the sink mobility has been considered as a good strategy to balance the nodes energy dissipation. Despite its numerous advantages, the data dissemination to the mobile sink is a challenging task for the resource constrained sensor nodes due to the dynamic network topology caused by the sink mobility. For efficient data delivery, nodes need to reconstruct their routes toward the latest location of the mobile sink, which undermines the energy conservation goal. In this paper, we present a virtual gridbased dynamic routes adjustment (VGDRA) scheme that aims to minimize the routes reconstruction cost of the sensor nodes while maintaining nearly optimal routes to the latest location of the mobile sink. We propose a set of communication rules that governs the routes reconstruction process thereby requiring only a limited number of nodes to readjust their data delivery routes toward the mobile sink. Simulation results demonstrate reduced routes reconstruction cost and improved network lifetime of the VGDRA scheme when compared with existing work

Penerapan Pembelajaran Model Problem Based Learning (Pbl) Untuk Meningkatkan Keterampilan Proses Sains Dan Motivasi Belajar Siswa Pada Materi Alat-alat Optik

Penelitian ini bertujuan untuk mengetahui peningkatan keterampilan proses sains dan motivasi belajar siswa terhadap penerapan model pembelajaran Problem Based Learning. Penelitian ini dilakukan dengan menggunakan rancangan eksperimen dengan The Randomized Pre-test Post-test, Control Group Design yang dilaksanakan pada SMP Negeri 1 Gandapura, semester genap Tahun Akademik 2014/2015. Pada siswa kelas VIII (delapan) yang terdiri dari kelas eksperimen 25 siswa dan kelas kontrol 24 siswa. Pengumpulan data dilakukan dengan tes awal dan tes akhir untuk keterampilan proses sains, angket untuk mengetahui motivasi belajar siswa, lembar observasi untuk mengetahui kegiatan guru dan siswa selama proses belajar mengajar dengan menggunakan model Problem Based Learning. Hasil uji normalitas dan homogenitas menunjukkan bahwa data berdistribusi normal dan homogen. Uji t terhadap N-Gain kedua kelas menunjukkan nilai 0,00<0,05 yang artinya terjadi perbedaan yang signifikan antara kedua kelompok. N-Gain tertinggi keterampilan proses sains setiap indikator kelas eksperimen 0,63 pada indikator mengklasifikasi individual/kelompok dan terendah 0,24 pada menerapkan konsep. N-Gain tertinggi pada kelas kontrol 2,88 pada mengklasifikasi sedangkan N-Gain terendah 0,13 pada indikator berkomonikasi. Berdasarkan hasil penelitian maka dapat disimpulkan bahwa penerapan pembelajaran Problem Based Learning dapat meningkatkan keterampilan proses sains dan motivasi belajar siswa

Soil Seed Bank of Two Karst Ecosystems in Bogor, Indonesia: Similarity with the Aboveground Vegeta-tion and Its Restoration Potential

Karst ecosystem in Bogor is currently threatened by mining activities. Restoration of the disturbed karst areas is urgently required. Seed banks are considered as an important potential seed sources for restoration. This study was conducted to quantify the composition and species diversity of the aboveground vegetation and the seed bank. The study determined the correspondence between the seed bank with the aboveground vegetation in relation with ecosystem restoration. Twenty 6 m × 6 m vegetation plots were established. A total of sixty soil samples were taken from the study sites. The seed bank was studied using germination experiment. All plant species in the vegetation plots and seedlings growing from all soil samples were identified and the number was counted to determine the composition, index of diversity, and index of similarity. There were 80 species from 41 families found in the seed bank in Mt. Nyungcung, dominated by Clidemia hirta (Melastomataceae), whereas 50 species from 29 families found in Mt. Kapur with Cecropia peltata (Urticaceae) dominated the site. Diversity index of Mt. Nyungcung and Mt. Kapur seed banks were 2.09 ± 0.21 and 1.78 ± 0.47 respectively. The similarity index between seed bank and the aboveground vegetation in the two study sites were 32.86% and 27.66% respectively. Mt. Nyungcung seed bank was more diverse than Mt. Kapur. The similarity between the seed bank with the aboveground vegetation in the two study sites were low. Further assessment is needed to determine the role of the seed bank of Mt. Nyungcung and Mt. Kapur in the restoration of the ecosystems

Penerapan Model Pembelajaran Kooperatif Tipe Co-op Co-op Dengan Media Video Untuk Meningkatkan Hasil Belajar Siswa Pada Pelajaran IPS Terpadu Kelas VII Mtsn Angkup Aceh Tengah

Model pembelajaran kooperatif tipe Co-op Co-op mengizinkan siswa untuk bekerja sama dalam kelompok kecil, pertama untuk kemajuan pemahaman mereka mengenai diri mereka sendiri dan berbagi pemahaman dengan teman-teman sebayanya, Co-op Co-op lebih mementingkan keterlibatan siswa sehingga siswa dapat berinteraksi dengan kelompoknya. Video merupakan bahan pembelajaran tampak dengar (audio visual) yang dapat digunakan untuk menyampaikan pesan-pesan/materi pelajaran. Penelitian ini bertujuan untuk mengetahui peningkatan hasil belajar siswa, aktivitas guru dan siswa, keterampilan guru dalam mengelola pembelajaran dan respon siswa terhadap model pembelajaran kooperatif tipe Co-op Co-op dengan media video. Subjek dan objek dalam penelitian ini adalah siswa kelas VII-2 MTsN Angkup Aceh Tengah yang berjumlah 26 siswa. Pengumpulan data dilakukan dengan menggunakan lembar soal, lembar pengamatan aktivitas guru dan siswa, lembar pengamatan keterampilan guru dan lembar respon siswa. Analisis data menggunakan statistik deskriptif persentase. Hasil penelitian menunjukkan bahwa persentase ketuntasan individual pada siklus I 65%, pada siklus II 84% dan pada siklus III 96%. Ketuntasan klasikal pada siklus pertama 50%, pada siklus kedua 70% dan pada siklus ketiga 90%, aktivitas guru dan siswa dari siklus I sampai siklus III telah terjadi Perubahan lebih baik dan sudah dikategorikan sesuai dengan standar waktu yang ditetapkan. Keterampilan guru dalam mengelola pembelajaran pada siklus I memperoleh skor 2,6 dengan kategori baik, pada siklus II memperoleh skor 2,9 dengan kategori baik dan pada siklus III menjadi 3,50 dengan kategori baik. Respon siswa terhadap model pembelajaran kooperatif tipe Co-op Co-op dengan media video dapat dikatakan baik, dengan persentase 96,2% dari 26 siswa berpendapat bahwa dengan belajar melalui model pembelajaran kooperatif tipe Co-op Co-op dengan media video dapat meningkatkan pemahaman mereka terhadap materi yang telah dipelajar

Beberapa Faktor yang Berhubungan dengan Diakuinya Seseorang sebagai Pemimpin Opini dan Manfaatnya untuk Kegiatan Penyuluhan

Opinion Leader at a certain areas, highly contributes to diffusion and adoption process, and has certain effect to social system whether the farmers rejected or accepted to a innovation. The research identified existence and function of Opinion Leader in an areas and analyzed correlated factors of recognition of Opinion Leader. Respondent were farmers of Floating Net Fish Culture at Coklat Area, Cirata Dam, District of Cianjur, West Java Province. The survey conducted since February until May 2005.The result showed that the farmers population, there were eight persons who considered by the respondents as sources of innovation and opinion. Futhermore internal characteristic had a positive value correlation among factors toward recognition level of Opinion Leader, but external characteristic showed negative correlation. Specially, the function of Opinion Leader those were strong correlation toward recognition farmers level to Opinion Leader

Penerapan Metode Korespondensi Bersama untuk Analisis Perubahan Perilaku Pengguna Smartphone

Competition is extremely tight in the technology sector including smartphones , the manufacturers compete to satisfy the desire of consumers with a variety of innovations. This study aims is form joint correspondence plot to determine whether consumers switch from one type to the other types of smartphones, as well as knowing what respondents consider when buying a smartphone . By adding a time variable data on methods of joint correspondence, changes in consumer behavior can be determined within a certain time . Time variables used was from 2011 to 2013 and smartphones that will be compared is Blackberry, Android and iOS. From the resulting graph can be seen that many kinds of smartphones used in each time variable and variables that affect the time of purchase . After doing research , showed that smartphone users in 2011, mostly used a Blackberry switched to Android in 2012 and 2013. Blackberry users at the time of puchase paid attention to the brand , color , design , and camera , but did not pay attention to prestige . Android users paid attention to completeness of the application , RAM , data capacity , color , resale price and network coverage . While iOS is not widely used by respondents from 2011 to 2013. iOS users considered the prestige , but did not consider the brand , design and battery life

Studying the Effect of Aqueous Extract from Curcuma Longa on Some Parameters of Cytogenetic, Immunity and Fertility in Female Mice

The research work was conducted to investigate the effect of oral administration of aqueous extract of turmeric at doses of (5, 10) mg/kg body weight for two weeks daily by determining the genotoxic effect (mitotic index), evaluation of immunological effect (IgG, IgM, IgA, C3, C4) and measuring fertility hormones (follicles stimulation hormone/FSH, lutenising hormone/LH) levels with histological examinations of female albino swiss mice ovaries in comparison with control (normal saline). A clear effect in increasing mitotic activity was reveled for both doses in comparison with control. Results also showed a significant increase in the value of all immunological parameters at both doses, in comparison with control. Also, obvious raise was seen in the levels of FSH and LH hormones for both doses when compared with normal saline treated mice with no significant damage seen in female ovaries tissue, in fact, there were certain changes in mice ovaries tissue which were represented by increasing in the numbers of primary and secondary follicles and in the numbers of corpus luteum at both doses also

Depression amongst healthcare workers in Maiduguri, north-eastern Nigeria

Objective: Very few studies reported the high prevalence of emotional reactions amongst healthcare workers, in sub-Saharan Africa. This study aimed to assess the prevalence of depression among health care workers in two tertiary health institutions in Maiduguri, north-Eastern Nigeria.Methods: In this comparative, cross-sectional study, we used a stratified sampling technique to recruit 370 healthcare workers (clinical and non-clinical staff) from university teaching hospital, and Federal Neuro-psychiatric Hospital, Maiduguri, Borno State, north-east Nigeria. The participants completed a semi-structured socio-demographic questionnaire and Beck Depression Inventory (BDI-II).Results: Twenty (10.7%) and 14 (7.6%) clinical and non-clinical health care workers, respectively had depression (÷2 = 1.096, df = 1, ñ = 0.295). The prevalence of depression in males and females were 7.8% and 26.9%, respectively. Gender had a significant association with depression (÷2 = 3.427, df = 1, ñ =0.043).Conclusion: For an effective healthcare delivery service, the psychological well-being of hospital workers must be improved. Hospital workers require skills on stress management techniques.Keywords: Depression, healthcare workers, Maiduguri, Nigeri

Seasonal Variation in The Biology of Chrysichthys Auratus (Geoffroy Saint-Hillaire, 1809) in Ogun State Estuary, Nigeria

This study examined the seasonal variation in the biology of Chrysichthys auratus (Geoffroy Saint-Hillaire, 1809) in Ogun State estuary, Nigeria. Fish were collected in the wet season (May-June, 2018) and dry season (November-December, 2018) from commercial fishermen at the estuary using the bamboo trap. The fish length, weight and other biological parameters were measured and estimated using standard procedures. A total of 432 samples with length ranging between of 10 to 25.9 cm and corresponding weight ranging between 10g to 91g were examined during the two seasons. The wet and dry season showed the peak frequency at size class 14 – 14.9cm and 19 – 19.9cm respectively. The study revealed a the sex ratio (M:F) of 1:0.7 and of 1:0.47 in the wet season and in the dry season respectively. The length-weight relationship showed a negative allometric growth in the wet dry and combined seasons with a “b” value less than 3. Size at maturity were 19.5 cm, 17.30 cm and 18.5 cm for males, females and combined sex respectively in the wet season while in the dry season, all the males were immature and the females attained maturity at a length estimated to be 17.00 cm. The study showed a positive relationship between fecundity and total length of C. auratus in the wet (r2 = 0.41) and dry (r2 = 0.45) while a positive relationship was also observed between ovary weight and fecundity in the dry season (r2 = 0.88) and wet season (r2 = 0.83). Seasonal assessment of biology and distribution of C. auratus is recommended to provide requisite information for sustainable management of the species