44 research outputs found
PENGGUNAAN BAHAN AJAR DALAM PEMBELAJARAN IPS SMP BERBASIS KONTEKSTUAL PADA SISWA KELAS VII SMP NEGERI 1 PURWANTORO WONOGIRI
This research aim: 1. Describe how teacher use the teaching material in
Social Subject in Junior High School 1 Purwantoro up until now. 2.
Describe the constraint and how to overcome it. 3. Describe the usage
result of the teaching material in study of Social for Junior High School
in Purwantoro 1 Junior High School.
This research takes place in Purwantoro 1 Junior High School, Wonogiri
Regency. This research metod is descriptive research of qualitative. This
research wants to describe and expose the usage of teaching material in
study of Contextual Based Social for Junior High School in Purwantoro
1 Junior High School according to the condition and the situation at the
moment.
Strategies utilized in this research are interviewing, question airing,
observing, and documenting.
The result of this research concludes that teaching material in Study of
Contextual Based Social for Junior High School in Purwantoro 1 Junior
High School, evaluated from its form covered : a). Printed teaching
material consist. b). Heard Teaching Material (audio) consist. c) Visual
and Listening Teaching Material consist. d). Interactive teaching
material like compact disc (doesnât yet able to be executed) e).
Environment teaching material (geography, history, and economics) still
applied in class theory level.
Current result achieved from the use of teaching materials in learning
of Social for Junior High School in Purwantoro Junior High School are:
1) Provide better learning environment for teachers and students. 2)
Help students and make them easy to learn Social. 3) Improve studentâs
learning achievement proved with 79,895 average score (it exceeds
current KKM set by the teachers: 72)
Keywords : The Use of, Teaching Materials of Contextual Based Social
for Junior High School
Reworked Precambrian metamorphic basement of the Lhasa terrane, southern Tibet: Zircons/Titanite U-Pb geochronology, Hf isotope geochemistry
Due to the paucity of exposure, the formation and evolution of the Precambrian basement of the Lhasa terrane remain poorly known. Here we report zircon and titanite in situ UâPb ages, bulk-rock geochemical and zircon Hf isotopic data on the orthogneisses from the Dongjiu area of the southern Lhasa subterrane (SLT), southern Tibet. Geochemical data suggest that the protoliths of the biotite-amphibole gneiss and biotite gneiss are granodiorite and granite, respectively. Inherited magmatic zircon cores from these orthogneisses give protolith crystalline ages of 1520â1506âŻMa, whereas the overgrown zircon rims give metamorphic ages of 605â590âŻMa. The Mesoproterozoic granitic rocks have bulk-rock ΔNd(t) values of â3.6 to +0.1 and zircon core ΔHf(t) values of â4.5 to +2.6, which give similar TDM2 ages of 2.35â2.05âŻGa and 2.54â2.10âŻGa respectively, suggesting their derivation from partial melting of Paleoproterozoic crustal material. The granitic rocks are also local provenance for the Mesoproterozoic detrital zircons in the Paleozoic strata in the Lhasa terrane. Titanite in situ UâPb ages further indicate that the Dongjiu orthogneiss experienced more recent metamorphism at ~26âŻMa. The mineral assemblage and thermobarometry calculations indicate that the Oligocene metamorphism occurred under medium-pressure (MP) amphibolite-facies conditions (5.4â7.2âŻkbar, 691â765âŻÂ°C). We propose that the Dongjiu gneisses represent the Precambrian metamorphic basement of the Lhasa terrane, but have been intensively reworked by metamorphism in the SLT in response to the continued India-Asia convergence since the collision
Interplay of quasiparticle-vibration coupling and pairing correlations on β-decay half-lives
The nuclear \u3b2-decay half-lives of Ni and Sn isotopes, around the closed shell nuclei78Ni and132Sn, are investigated by computing the distribution of the Gamow\u2013Teller strength using the Quasiparticle Random Phase Approximation (QRPA) with quasiparticle-vibration coupling (QPVC), based on ground-state properties obtained by Hartree\u2013Fock\u2013Bogoliubov (HFB) calculations. We employ the effective interaction SkM\u204eand a zero-range effective pairing force. The half-lives are strongly reduced by including the QPVC. We study in detail the effects of isovector (IV) and isoscalar (IS) pairing. Increasing the IV strength tends to increase the lifetime for nuclei in the proximity of, but lighter than, the closed-shell ones in QRPA calculations, while the effect is significantly reduced by taking into account the QPVC. On the contrary, the IS pairing mainly plays a role for nuclei after the shell closure. Increasing its strength decreases the half-lives, and the effect at QRPA and QRPA+QPVC level is comparable. The effect of IS pairing is particularly pronounced in the case of the Sn isotopes, where it turns out to be instrumental to obtain good agreement with experimental data
The Vacuum System of HIRFL
AbstractThe vacuum system of Heavy Ion Research Facility in Lanzhou (HIRFL) is a large and complex system. HIRFL consists of two ECR ion sources, a sector focus cyclotron (SFC), a separate sector cyclotron (SSC) and a multi-purpose cooling storage ring system which has a main ring (CSRm) and an experiment ring (CSRe). Several beam lines connect these accelerators together and transfer various heavy ion beams to more than 10 experiment terminals. According to the requirements of the ion acceleration and ion lifetime, the working pressure in each accelerator is different. SFC is nearly 50 years old. After upgrade, the working pressure in SFC is improved from 10-6mbar to 10-8mbar. The pressure in SSC which was built in the 1980s reaches the same level. The cooling storage ring system with a length of 500m came into operation in 2007. The average pressures in CSRm and CSRe are 5Ă10-12mbar and 8Ă10-12mbar respectively. Different designs were adopt for vacuum system of a dozen beam lines to meet specific requirement of each experiment terminal. Along with the extensive development of the heavy ion researches and applications, new accelerators of HIRFL are under construction. The vacuum system of the new machines will be designed and constructed followed the overall schedule
Mesozoic crustal evolution of southern Tibet: Constraints from the Early Jurassic igneous rocks in the central Lhasa terrane
Phanerozoic growth of continental crust on our planet is one of the important research themes in Earth Science. Here, we present the results of a systematic study of newly found and previously reported Mesozoic igneous rocks, including diorite cumulate, granodiorite cumulate, mafic magmatic enclaves (MME) and host granitoids in the central Lhasa terrane, southern Tibet. These igneous rocks give zircon UPb crystallization ages of 199â189âŻMa. Based on constituent mineral and bulk-rock compositions, the cumulates are best understood as resulting from amphibole, plagioclase and titanite crystallization from a mafic andesitic magma. The host granitoids also show compositional systematics consistent with amphibole-plagioclase fractional crystallization from andesitic magma. The MMEs share many characteristics with their host granitoids in common, including identical crystallization age, similar mineralogy, mineral chemistry and zircon isotopic compositions, representing earlier cumulate derived from the same magmatic system as their host rocks. The magma parental to the studied Early Jurassic igneous rocks is best explained as resulting from partial melting of hydrated ocean crust together with varying continental material. The increasing zircon ΔHf(t) values of multiple plutons in the central Lhasa terrane with time during ~215â170âŻMa indicate its gradual increase in mantle contribution. We present the Early Mesozoic crustal evolution in the Lhasa terrane