The Life-cycle of biosteres persulcatus with reference to adults' reproductive capacity on eggs of Carambola fruit-fly

A study of the life-cycle of Biosteres persulcatus Silvestri, a larval parasitoid of (Bactrocera (B) sp. near Bactrocera dorsalis A), was conducted in the laboratory (26.50C± 1.50 C). There are 4 larval stages as indicated by the sizes of the mouthhooks. The first larval moult occurred in the newly{ormed puparium of the host. The entire developmental period from egg to adult emergence for male and female was 16.3± 0.80 days and 1 7.1 ± 0.80 days respectively. The average reproductive capacity during the life span was 67 ± 3.5 eggs

Biology of Diachasmimorpha longicaudata, A Parasitoid of Carambola Fruit Fly, (Diptera; Tephritidae)

The life cycle study of Diachasmimorpha longicaudata, a larval parasitoid of Bactrocera (B) sp. near Bactrocera dorsalis A, was conducted in the laboratory (26°C± 1.5°). There were 4 larval stages based on the size of the mouthhook. The first larval moult occurred in the newly formed pupanum of the host. The entire developmental periods for males and females were 16.3 ± 0.8 day and 17.5 ± 0.8 days, respectively. The average reproductive capacity per female during the life-span was 92 ± 4.5 eggs

Geochemical Partitioning of Some Heavy Metals in Bottom Sediment of River Delimi in Jos, Nigeria

The determination of total metal content is usually insufficient to fully assess the environmental impacts of contaminated sediments. In order to differentiate metals of lithogenic from those of anthropogenic origin and assess their bioavailability and potential toxicity, detail information on their partitioning to various geochemical fractions of the sediment is necessary. In recent times there has been a lot of concern on the rate at which River Delimi ecosystem deteriorate as it passes through Jos city. This study was aimed at determining the geochemical partitioning of Cd, Cu, Pb and Zn in River Delimi sediment with a view to determining the extent to which they might be remobilized and affect the quality of the river ecosystem. The study was conducted at three sites along River Delimi and one control site at Lamingo Dam all within Jos city. The total metals content in sediment were extracted using aqua-regia. A five-step sequential extraction procedure was used to determine the partitioning of the metals into different geochemical fractions of the sediment. The metals extracted were determined using Atomic Absorption Spectrophotometer (AAS). The total metals content in sediment were generally higher at the study compared to the control site. The mean values of Cd in sediment (1.330mg/kg, 1.515mg/kg, 1.301mg/kg and 0.900mg/kg) respectively for stations I, II, III and IV were all above the limit of 0.68mg/kg recommended by USEPA. Sediment samples obtained from River Delimi had more metals associated with the non-residual fractions compared to those from Lamingo Dam. The high amount of these metals recovered in non – residual fractions mean that the metals are in potentially available forms and could pose a serious threat to the river ecosystem. Measures should therefore be put in place by the relevant authorities to curtail indiscriminate dumping of domestic and industrials wastes into the river

Unjuk Kerja Vortex Tube Cooler Pada Pemesinan Baja St41

Proses pemesinan merupakan proses manufaktur dimana objek dibentuk dengan cara membuang atau menghilangkan sebagian material dari benda kerjanya. Pada proses pembubutan, panas yang dihasilkan sangat tinggi sebagai akibat dari gesekan antara pahat bubut dan benda kerja. Salah satu faktor berpengaruh pada dalam proses pembubutan adalah media pendingin. Dalam penelitian ini pembubutan dilakukan menggunakan pahat HSS dan material uji baja ST41, dengan media pendingin system vortex tube (udara dingin bertekanan) menghasilkan suhu udara dingin 14,6 C, 18,5 C, 21, C. Udara dingin luaran vortex tube digunakan selama proses pembubutan dengan parameter feeding (f) 0,1 mm/rev, kecepatan spindel adalah 625(rpm) dan kedalaman potong konstan 2 mm. Hasil penelitian pendingin vortex tube bukaan 2 dengan gerak makan 0,11 mm/rev dan kecepatan potong 80,46 m/menit menghasilkan umur pahat mencapai 5,63 menit, pada bukaan 3 dengan kecepatan potong 72,61 m/menit dan gerak makan 0,11 mm/rev umur pahat mencapai 5,60 menit. Umur pahat terendah di dapat tanpa menggunakan pendingin dengan gerak makan 0,11 mm/rev, kecepatan potong 88,39 m/menit, yaitu mencapai 2,86 menit dan umur pahat tertinggi didapat menggunakan media pendingin vortex tube bukaan 1 dengan gerak potong 0,11 m/rev dan kecepatan potong 88,39m/min sebesar 6,29 menit. Oleh karena itu media pendingin vortex tube dapat meningkatkan umur pahat HSS hingga mencapai 52,76%

Dislocation Dynamics in an Anisotropic Stripe Pattern

The dynamics of dislocations confined to grain boundaries in a striped system are studied using electroconvection in the nematic liquid crystal N4. In electroconvection, a striped pattern of convection rolls forms for sufficiently high driving voltages. We consider the case of a rapid change in the voltage that takes the system from a uniform state to a state consisting of striped domains with two different wavevectors. The domains are separated by domain walls along one axis and a grain boundary of dislocations in the perpendicular direction. The pattern evolves through dislocation motion parallel to the domain walls. We report on features of the dislocation dynamics. The kinetics of the domain motion are quantified using three measures: dislocation density, average domain wall length, and the total domain wall length per area. All three quantities exhibit behavior consistent with power law evolution in time, with the defect density decaying as $t^{-1/3}$, the average domain wall length growing as $t^{1/3}$, and the total domain wall length decaying as $t^{-1/5}$. The two different exponents are indicative of the anisotropic growth of domains in the system.Comment: 8 figures: 7 jpeg and 1 pd

Probing SUSY-induced CP violations at B factories

In the minimal supersymmetric standard model (MSSM), the \mu-parameter and the trilinear coupling A_t may be generically complex and can affect various observables at B factories. Imposing the edm constraints, we find that there is no new large phase shift in the B^0 - \bar{B^0} mixing, CP violating dilepton asymmetry is smaller than 0.1 %, and the direct CP violation in B\to X_s \gamma can be as large as \sim \pm 16 %.Comment: 4 pages, 2 figures. Version to appear in Phys. Rev. Let

Microstructure Alterations of Ti-6Al-4V ELI During Turning by Using Tungsten Carbide Inserts Under Dry Cutting Condition

Titanium alloys possesses a hexagonal close packed(h.c.p) structure, called phase to ambient temperature. Thisstructure changes to body center cubic (b.c.c), called phase tothe temperature of 882 C. Machining process that generates hightemperature during machining can affect on microstructures ofmachined surface, which represents as a quality of components.The turning parameters evaluated are cutting speed (55 - 95m/min), feed rate (0.15 - 0.35 mm/rev), depth of cut (0.10 - 0.20mm) and tool grade (uncoated, CVD and PVD). The aims of thispaper are to investigate the effects of machining process onmicrostructures of machined surface and chip were machinedusing tungsten carbide inserts under dry cutting condition. Theresults show that machining at high cutting speed (95 m/min)affected on the microstructure significantly at the end ofmachining. The temperature is the most significant factoraffected on microstructure of the machined surface and chip atshear zone. The changes of microstructure were also affected bythe tool pressure during cutting

Discovery of a 6.4 keV Emission Line in a Burst from SGR 1900+14

We present evidence of a 6.4 keV emission line during a burst from the soft gamma-ray repeater SGR 1900+14. The Rossi X-ray Timing Explorer (RXTE) monitored this source extensively during its outburst in the summer of 1998. A strong burst observed on August 29, 1998 revealed a number of unique properties. The burst exhibits a precursor and is followed by a long (~ 1000 s) tail modulated at the 5.16 s stellar rotation period. The precursor has a duration of 0.85 s and shows both significant spectral evolution as well as an emission feature centered near 6.4 keV during the first 0.3 s of the event, when the X-ray spectrum was hardest. The continuum during the burst is well fit with an optically thin thermal bremsstrahlung (OTTB) spectrum with the temperature ranging from about 40 to 10 keV. The line is strong, with an equivalent width of 400 eV, and is consistent with Fe K-alpha fluorescence from relatively cool material. If the rest-frame energy is indeed 6.4 keV, then the lack of an observed redshift indicates that the source is at least 80 km above the neutron star surface. We discuss the implications of the line detection in the context of models for SGRs.Comment: AASTex preprint, 14 pages, 3 embedded figures. Accepted for Publication in Astrophysical Journal Letter

Qualitative Assessment of Batur Sheeps Kept by Smallholder Farmers in Banjarnegara, Indonesia

Batur sheep is one of Indonesian’s local sheep species with the original geographical distribution in the Batur District and surrounding areas. This study was conducted to determine the suitability of the Batur sheep that were kept by smallholder farmers. The study was conducted in Batur Village, Banjarnegara Regency, Indonesia in February 2020 by identifying the qualitative traits of Batur sheeps (64 males and 129 females) compared to other sheep breeds. Qualitative data were then transformed into dummy data and given scores in each category. Data were analyzed descriptively using Chi-square analysis and Independent Sample T-Test. The Chi-square analysis findings determined (P<0.05) the qualitative characteristics, which included the face profile, the face wool coat density, and the suitability score of the male and female of the Batur sheep breed. The total of 98.6% male and 74.4% female sheep had suitable qualitative characteristics to the Batur sheep breed with suitability scores of 91.72 and 81.90, respectively. In conclusion, the male and female Batur sheep on Batur Village, Banjarnegara Regency, Indonesia, was still suitable to Batur sheep breed based on the assessment of the body’s phenotypic assessment. Keywords: Body characteristics, Exterior traits, Local sheep, Phenotypic assessment, Suitability valu

Nucleon Edm from Atomic Systems and Constraints on Supersymmetry Parameters

The nucleon EDM is shown to be directly related to the EDM of atomic systems. From the observed EDM values of the atomic Hg system, the neutron EDM can be extracted, which gives a very stringent constraint on the supersymmetry parameters. It is also shown that the measurement of Nitrogen and Thallium atomic systems should provide important information on the flavor dependence of the quark EDM. We perform numerical analyses on the EDM of neutron, proton and electron in the minimal supersymmetric standard model with CP-violating phases. We demonstrate that the new limit on the neutron EDM extracted from atomic systems excludes a wide parameter region of supersymmetry breaking masses above 1 TeV, while the old limit excludes only a small mass region below 1 TeV.Comment: 10 pages, 7 figure file