Population parameters of small pelagic fishes caught off Tawi-Tawi, Philippines

Growth and mortality parameters, exploitation rates and annual recruitment patterns were estimated from monthly length-frequency samples for Sardinella longiceps, S. fimbriata, S. Albella, Decapterus macrosoma, Dipterygonatus balteatus, Rastrelliger faughni and Encrasicolina heteroloba. These results provide the first sets of stock parameter estimates for these species off Tawi-Tawi, Philippines. The growth parameters derived were found comparable with previous estimates available for the same species from other localities. Recruitment was noted to be year-round and bimodal. Estimates of fishing mortality and exploitation rate were found to be presently above appropriate levels.

Nawādir al-kirām fī al-Jāhilīyah wa-al-Islām : wa-hiya yaḥtawī ʻalá ashhar nawādir al-sakhāʼ allatī jarat ayyām al-Barāmikah wa-man jārāhum min al-kurumāʼ ka-Maʻn ibn Zāʼidah wa-Ḥātim al-Ṭāʼī wa-al-khulafāʼ wa-ghayrihim /

Mode of access: Internet.

Hādhihi nabdhah muḥtawīyah ʻalá baʻḍ manāqib al-ghawth al-shahīr wa-al-quṭub al-munīr /

Mode of access: Internet.

Majmūʻ sharīf wa-sifr laṭīf yaḥtawī ʻalá kitāb jalīl wa-athar jamīl [microform] /

Taṭbīq ḥukm al-ṭarīqah al-ʻalīyah ʻalá al-aḥkām al-sharʻīyah al-nabawīyah -- al-Bāriqah -- Bughyat ūlī al-afhām fī al-farq bayna al-ḥal wa-al-maqām --Sirr al-ḥāl -- Tasliyat al-bāl fī aḥkām manāfidh al-khayāl -- Lumʻat al-naṣr fī luzūm al-ṣabr.

PIC simulation of a thermal anisotropy-driven Weibel instability in a circular rarefaction wave

The expansion of an initially unmagnetized planar rarefaction wave has recently been shown to trigger a thermal anisotropy-driven Weibel instability (TAWI), which can generate magnetic fields from noise levels. It is examined here whether the TAWI can also grow in a curved rarefaction wave. The expansion of an initially unmagnetized circular plasma cloud, which consists of protons and hot electrons, into a vacuum is modelled for this purpose with a two-dimensional particle-in-cell (PIC) simulation. It is shown that the momentum transfer from the electrons to the radially accelerating protons can indeed trigger a TAWI. Radial current channels form and the aperiodic growth of a magnetowave is observed, which has a magnetic field that is oriented orthogonal to the simulation plane. The induced electric field implies that the electron density gradient is no longer parallel to the electric field. Evidence is presented here that this electric field modification triggers a environments, which are needed to explain the electromagnetic emissions by astrophysical jets. It is outlined how this instability could be examined experimentally.second magnetic instability, which results in a rotational low-frequency magnetowave. The relevance of the TAWI is discussed for the growth of small-scale magnetic fields in astrophysical

Germination and survival of tetraspores of Kappaphycus alvarezii var. alvarezii (Solieriaceae, Rhodophyta) introduced in subtropical waters of Brazil

The carrageenophyte Kappaphycus alvarezii was introduced in 1995 and vegetatively propagated in Ubatuba, Sao Paulo State, Brazil, for the purpose of commercial cultivation. This species produces tetraspores mainly in the austral summer and fall. Tetraspore germination and survival were studied under different conditions of temperature, photon flux density, and photoperiod in the laboratory. Field experiments were also carried out. Although tetraspores of K. alvarezii germinated, they had low survival rates, most dying after 20 days. Recruitment of K. alvarezii tetraspores did not occur in experiments conducted in the field. The results indicated that the establishment of K. alvarezii via spore production in the natural environment of the south-east coast of Brazil is rather remote.

al-Ḥamāsah al-sanīyah al-kāmilat al-mazīyah fī al-riḥlah al-ʻilmīyah al-Shinqīṭīyah al-Turkuzīyah [microform] /

v. 1. Yaḥtawī ʻalá arbaʻ qaṣāʼid wa-maqṭūʻah -- v. 2. Yaḥtawī ʻalá khams qaṣāʼid wa-maqṭūʻah.