Spawning and Larval Development Dog Conch (Strombus Turturella)

Dog conch (Strombus turturella) is considered one of fishery commodities in Bangka Belitung Islands. This conch is often exploited and result in their populations are increasingly threatened. The aim of study to observe the reproduction and larval development of dog conch were studied under laboratory conditions. For the treatment of spawning the dog conch were placed in spawning tanks with a capacity of 1 ton. Stimulation of spawning is done by replacing the water in the tank as much as 90% every 24 hours until the eggs released by females. Spawning was preceded by copulation and fertilization occurs inside the female\u27s body.The results showed that the first egg cell divides into two cells after two hours of spawning. Then each cell continues to divide into four cells to become multicellular and reach the gastrula stage after 48 hours. Free swimming larval phase for four days and then settle down along with the formation of the first shell. The larvae will grow up to 5 mm shell length for 20 days

Theory of a Continuous Hc2_{c2} Normal-to-Superconducting Transition

I study the $H_{c2}$ transition within the Ginzburg-Landau model, with $m$-component order parameter $\psi_i$. I find a renormalized fixed point free energy, exact in $m\rightarrow\infty$ limit, suggestive of a $2$nd-order transition in contrast to a general belief of a $1$st-order transition. The thermal fluctuations for $H\neq 0$ force one to consider an infinite set of marginally relevant operators for $d<d_{uc}=6$. I find $d_{lc}=4$, predicting that the ODLRO does not survive thermal fluctuations in $d=2,3$. The result is a solution to a critical fixed point that was found to be inaccessible within $\epsilon=6-d$-expansion, previously considered in E.Brezin, D.R.Nelson, A.Thiaville, Phys.Rev.B {\bf 31}, 7124 (1985), and was interpreted as a $1$st-order transition.Comment: 4 pages, self-unpacking uuencoded compressed postscript file with a figure already inside text; to appear in Phys. Rev. Lett

First-Order Melting of a Moving Vortex Lattice: Effects of Disorder

We study the melting of a moving vortex lattice through numerical simulations with the current driven 3D XY model with disorder. We find that there is a first-order phase transition even for large disorder when the corresponding equilibrium transition is continuous. The low temperature phase is an anisotropic moving glass.Comment: Important changes from original version. Finite size analysis of results has been added. Figure 2 has been changed. There is a new additional Figure. To be published in Physical Review Letter

Peran Orang Tua dalam Mengatasi Kenakalan Remaja di Kelurahan Laimpi Kecamatan Kabawo Kabupaten Muna

Tujuan penelitian ini adalah : 1) Untuk mengetahui Jenis-jenis Kenakalan Remaja yang terjadi di Kelurahan Laimpi Kecamata Kabawo Kabupaten Muna. 2) Untuk Mengetahui Faktor-Faktor yang mempengaruhi kenakalan Remaja di Kelurahan Laimpi Kecamatan Kabawo Kabupaten Muna. 3) Untuk Mengetahui Usaha Mengatasi kenakalan remaja di Kelurahan Laimpi Kecamatan Kabawo Kabupaten Muna. .Penentuan informan dilakukan secara purposive sampling yaitu teknik penentuan informan secara sengaja yang berjumlah 19 orang dan data penelitian ini diperoleh melalui interview (wawancara) serta analisis secara deskriptif kualitatif. Hasil penelitian ini menunjukan bahwa : 1. Jenis-jenis Kenakalan Remaja yang terjadi di Kelurahan Laimpi Kecamata Kabawo Kabupaten Muna yaitu a) Perkelahian (Penganiayaan) adalah terjadinya suatu perilaku menyimpang (perkelahian) disebabkan karena unsur ketidaksengajaan tetapi malah terjadinya suatu perilaku menyimpang yaitu berkelahi. b) pencurian adalah suatu perilaku menyimpang dalam seseorang yang disebabkan adanya suatu pergaulan, sehingga timbulnya seseorang melakukan hal yang tidak baik yaitu mencuri. c) Pemalakan adalah seseorang terjerumus di dalamnya disebabkan kondisi keadaan mabuk. Contoh sembarang memalak orang. 2. Faktor-Faktor yang mempengaruhi kenakalan Remaja di Kelurahan Laimpi yaitu a) faktor internal adalah suatu faktor lingkungan sehingga sulit baginya anak mengontrol dirinya dari perilaku menyimpang, anak berkelahi dan mencuri. b) faktor eksternal adalah orang tua lalai dalam mendidik anak sehingga anak dengan semena-mena melakukan perilaku menyimpang, melakukan perkelahian dan pencurian.3. Usaha mengatasi kenakalan remaja di Kelurahan Laimpi memiliki beberapa tahapan yaitu sebagai berikut : a) USAha preventif adalah orang tua memeberikan didikan yang baik (menamkan nilai moral, nilai religius dalam diri anak), menjaga harmonis dalam keluarga. b) USAha pembinaan adalah USAha orang tua, tokoh masyarakat untuk memberikan pemahaman ilmu agama serta dibina dalam kedisiplinan bertingkah laku, agar tidak melakukan perilaku menyimpang, seperti berkelahi dan mencuri

Osteosarcoma of the femur in early adult: a case report

Osteosarcomas are primary malignant tumors of bone that are characterized by the production of osteoid or immature bone by the malignant cells. Osteosarcomas are uncommon tumors. Most articles reveal difficulty in diagnosing osteosarcoma in early stage due to its resemblance to benign lesion. That’s why we prefer to do case report for documentation. Diagnosis of the tumor is important especially in early stages for improving prognosis. This case report is of a 21 years old female who presented at Primary Health Care Centre with swelling above right knee post trauma a month ago. Previously she was diagnosed as Non ossifying fibroma (which is a benign lesion and uncommon to change to malignant lesion) at the same site in 2017.

Rheumatoid arthritis onset after COVID-19 infection: a case report

At the end of 2019, coronavirus disease (COVID-19) outbreak is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV2). Worldwide researchers and physician try to explore the mechanisms of damage induced by virus, they focus on the short-term and long-term immune-mediated consequences induced by the virus infection. Every day discover a new pathological condition induced by virus and new symptoms and disease may occur after recovery from disease. Our case report is 41 years old, Indian lady who presented to our primary health care centre complaining of multiple small hand joints pain, both elbows and knees pain with swelling of them and prolonged morning stiffness, diagnosed seropositive rheumatoid arthritis (RA) (arthritis, positive rheumatoid factor (RF), and X-ray changes) after 1 month recovery from COVID-19 infection. She did not have any joint pain and she had negative RF before COVID-19 infection with no family history of RA

First order phase transition of the vortex lattice in twinned YBa2Cu3O7 single crystals in tilted magnetic fields

We present an exhaustive analysis of transport measurements performed in twinned YBa2Cu3O7 single crystals which stablishes that the vortex solid-liquid transition is first order when the magnetic field H is applied at an angle theta away from the direction of the twin planes. We show that the resistive transitions are hysteretic and the V-I curves are non-linear, displaying a characteristic s-shape at the melting line Hm(T), which scales as epsilon(theta)Hm(T,theta). These features are gradually lost when the critical point H*(theta) is approached. Above H*(theta) the V-I characteristics show a linear response in the experimentally accessible V-I window, and the transition becomes reversible. Finally we show that the first order phase transition takes place between a highly correlated vortex liquid in the field direction and a solid state of unknown symmetry. As a consequence, the available data support the scenario for a vortex-line melting rather than a vortex sublimation as recently suggested [T.Sasagawa et al. PRL 80, 4297 (1998)].Comment: 10 pages, 8 figures, submitted to PR

Energy cost associated with vortex crossing in superconductors

Starting from the Ginzburg-Landau free energy of a type II superconductor in a magnetic field we estimate the energy associated with two vortices crossing. The calculations are performed by assuming that we are in a part of the phase diagram where the lowest Landau level approximation is valid. We consider only two vortices but with two markedly different sets of boundary conditions: on a sphere and on a plane with quasi-periodic boundary conditions. We find that the answers are very similar suggesting that the energy is localised to the crossing point. The crossing energy is found to be field and temperature dependent -- with a value at the experimentally measured melting line of $U_\times \simeq 7.5 k T_m \simeq 1.16/c_L^2$, where $c_L$ is the Lindemann melting criterion parameter. The crossing energy is then used with an extension of the Marchetti, Nelson and Cates hydrodynamic theory to suggest an explanation of the recent transport experiments of Safar {{\em et al.}\ }.Comment: 15 pages, RevTex v3.0, followed by 5 postscript figure