1,171 research outputs found
Measurement of quarkonium production at forward rapidity in pp collisions at √s=7 TeV
The inclusive production cross sections at forward rapidity of J/ψ , ψ(2S) , Υ (1S) and Υ (2S) are measured in pp collisions at s√=7 TeV with the ALICE detector at the LHC. The analysis is based on a data sample corresponding to an integrated luminosity of 1.35 pb‾¹ . Quarkonia are reconstructed in the dimuon-decay channel and the signal yields are evaluated by fitting the μ+μ− invariant mass distributions. The differential production cross sections are measured as a function of the transverse momentum pT and rapidity y , over the ranges 0<pT<20 GeV/c for J/ψ , 0<pT<12 GeV/c for all other resonances and for \(2.5 . The measured cross sections integrated over pT and y , and assuming unpolarized quarkonia, are: σJ/ψ=6.69±0.04±0.63 μ b, σψ(2S)=1.13±0.07±0.19 μ b, σΥ(1S)=54.2±5.0±6.7 nb and σΥ(2S)=18.4±3.7±2.9 nb, where the first uncertainty is statistical and the second one is systematic. The results are compared to measurements performed by other LHC experiments and to theoretical models
Event-by-event mean pT fluctuations in pp and Pb–Pb collisions at the LHC
Event-by-event fluctuations of the mean transverse momentum of charged particles produced in pp collisions at TeX TeX 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at TeX TeX 2.76 TeV are studied as a function of the charged-particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emission are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a similar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a significant reduction of the fluctuation strength. The results in Pb–Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena
UPAYA MENINGKATKAN MOTIVASI BELAJAR SISWA MELALUI MEDIA GAME EDUCATION DALAM PEMBELAJARAN IPS DI MTs HASBUR RACHMAN ALIF DESA LENGKONG WETAN KABUPATEN MAJALENGKA
ASEP SAMSUL MA'ARIF :
Berdasarkan Observasiawal di kelas VII MTs Hasbur Rachman Alif terlihat
proses pembelajaran IPS masih menggunakan media spidol dan papan tulis. Sehingga
banyak siswa yang kurang memperhatikan guru pada saat proses pembelajaran., Hal
ini berakibat pada kejenuhan dan kebosanan yang berdampak pada hasil belajar siswa
yang kurang dari KKM yang diterapkan di MTs Hasbur Rachman Alif yakni 70.
Tujuan penelitian ini untuk mengetahui bagaimana penerapan pembelajaran
dengan menggunakan media Game Education pada mata pelajaran IPS Terpadu,
aktivitas siswa dan kinerja guru dengan pembelajaran dengan menggunakan media
Game Education, dan mengetahui motivasi belajar siswa sebelum dan setelah
diterapkannya pembelajaran dengan menggunakan media Game education pada mata
pelajaran IPS Terpadu di MTs Hasbur Rachman Alif.
Pembelajaran dengan menggunakan media Game Education menekankan
motivasi siswa untuk berpikir kritis dan menuangkan. Hal ini memudahkan siswa
untuk mengakses materi IPS yang banyak dimanapun, serta mempemudah daya
ingat siswa tentang apayatgtelah didapatkan selama proses pembelajaran.
Penelitian ini menggunakan Penelitian Tindakan Kelas (pTK) yang
dilaksanakan selama tiga siklus. Teknik Pengumpulan data menggunakan observasi,
tes, dan dokumentasi. Subjek penelitian ini adalah siswa kelas VII MTs Hasbur
Rachman Alif sebanyak 31 siswa yang terdiri dari 18 siswa laki-laki dan 13 siswa
perempuan.
Pembelajaran dengan menggunakan media Game Education dapat
meningkatkan motivasi belajar siswa hal ini terlihat dari hasil tes yang telah
dilakukan selama tiga siklus, dimana pada pratindakan (pretes) nilai sebesar 65,25
dan ketuntasan belajar 25 yo, siklus I nilai rata-rata sebesar 76,75 dan ketuntasan_
belajar siswa sebesar 65,5%o siklus II nilai rata-rata siswa 85,75 dan nilai ketuntasan
belajar sebesar 90% siklus III dengan nilai rata-rata 92,25 dan ketuntasan belajar
mengalami peningkatanya itu 97,5yo. Dengan demikian dapat disimpulkan bahwa
pembelajaran dengan menggunakan media Game Education merupakan salah satu
upaya untuk meningkatkan hasil belajar siswa pada mata pelajaran IPS Terpadu di
MTs Hasbur Rachman Alif.
Kata Kunci: Game Education, MotivasiBelajar, PTK
Suppression of ψ(2S) production in p-Pb collisions at √sNN=5.02 TeV .
The ALICE Collaboration has studied the inclusive production of the charmonium state ψ(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy √sNN = 5.02TeV at the CERN LHC. The measurement was performed at forward (2.03 < ycms < 3.53) and backward (−4.46 < ycms < −2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections σ (2S), both integrated and as a function of the transverse momentum pT, for the two ycms domains. The results are compared to those obtained for the 1S vector state (J/ψ), by showing the ratios between the production cross sections, as well as the double ratios [σ (2S)/σJ/ ]pPb/[σ (2S)/σJ/ ]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive ψ(2S) is evaluated and compared to the measurement of the same quantity for J/ψ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the ψ(2S) compared to that measured for J/ψ and to models. These observations represent a clear indication for sizeable final state effects on ψ(2S) production
Production of charged pions, kaons and protons at large transverse momenta in pp and Pb-Pb collisions at = 2.76 TeV
Transverse momentum spectra of and up to = 20 GeV/c at mid-rapidity, |y| 0.8, in pp and Pb-Pb collisions at = 2.76 TeV have been measured using the ALICE detector at the LHC. At intermediate (2-8 GeV/c) an enhancement of the proton-to-proton ratio, (p + \bar{p})/(\pi^+ + \pi^-\(), with respect to pp collisions is observed and the ratio reaches 0.80 in central Pb-Pb collisions. The measurement of the nuclear modification factors for \(\pi^{\pm}, K^{\pm} and indicates that within the systematic and statistical uncertainties they are the same at high (> 10 GeV/c), suggesting that the chemical composition of leading particles from jets in the medium is similar to that of vacuum jets.publishedVersio
Transverse momentum dependence of inclusive primary charged-particle production in p–Pb collisions at √sNN=5.02 TeV
The transverse momentum ( pT ) distribution of primary charged particles is measured at midrapidity in minimum-bias p–Pb collisions at sNN−−−√=5.02 TeV with the ALICE detector at the LHC in the range \(0.15 GeV/ c . The spectra are compared to the expectation based on binary collision scaling of particle production in pp collisions, leading to a nuclear modification factor consistent with unity for pT larger than 2 GeV/ c , with a weak indication of a Cronin-like enhancement for pT around 4 GeV/c . The measurement is compared to theoretical calculations and to data in Pb–Pb collisions at sNN−−−√=2.76 TeV
The Behavior, onḂ0,11, of an Oscillatory Integral with Polynomial Phase Function
AbstractWe study the convolution oscillatory singular integral operatorTf=p.v.Ω∗f, with Ω(x)=eiq(x)K(x), whereqis a real-valued polynomial of a real variable, of degreed≥2, andKis a Calderón–Zygmund-type kernel. We prove that this operator extends to an operator that maps the Besov spaceḂ0,11into the Hardy-type spaceH10
Charmonium and pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at = 2.76 TeV
The ALICE Collaboration at the LHC has measured the and ' photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at = 2.76 TeV. The charmonium is identified via its leptonic decay for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 23 , The cross section for coherent and incoherent production in the rapidity interval -0.9 < y < 0.9, are mb and mb, respectively. The results are compared to theoretical models for production and the coherent cross section is found to be in good agreement with those models which include nuclear gluon shadowing consistent with EPS09 parametrization. In addition the cross section for the process has been measured and found to be in agreement with the STARLIGHT Monte Carlo predictions.publishedVersio
Dehydroepiandrosterone sulfate mediates activation of transcription factors CREB and ATF-1 via a Gα11-coupled receptor in the spermatogenic cell line GC-2
AbstractDehydroepiandrosterone sulfate (DHEAS) is a circulating steroid produced in the adrenal cortex, brain, and gonads. Whereas a series of investigations attest to neuroprotective effects of the steroid in the brain, surprisingly little is known about the physiological effects of DHEAS on cells of the reproductive system. Here we demonstrate that DHEAS acting on the spermatogenic cell line GC-2 induces a time- and concentration-dependent phosphorylation of c-Src and Erk1/2 and activates the transcription factors activating transforming factor-1 (ATF-1) and cyclic AMP-responsive element binding protein (CREB). These actions are consistent with the non-classical signaling pathway of testosterone and suggest that DHEAS is a pro-androgen that is converted into testosterone in order to exert its biological activity. The fact, however, that steroid sulfatase mRNA was not detected in the GC-2 cells and the clear demonstration of DHEAS-induced activation of Erk1/2, ATF-1 and CREB after silencing the androgen receptor by small interfering RNA (siRNA) clearly contradict this assumption and make it appear unlikely that DHEAS has to be converted in the cytosol into a different steroid in order to activate the kinases and transcription factors mentioned. Instead, it is likely that the DHEAS-induced signaling is mediated through the interaction of the steroid with a membrane-bound G-protein-coupled receptor, since silencing of Guanine nucleotide-binding protein subunit alpha-11 (Gnα11) leads to the abolition of the DHEAS-induced stimulation of Erk1/2, ATF-1, and CREB. The investigation presented here shows a hormone-like activity of DHEAS on a spermatogenic cell line. Since DHEAS is produced in male and female reproductive organs, these findings could help to define new roles for DHEAS in the physiology of reproduction
Measurement of the Cross Section for Electromagnetic Dissociation with Neutron Emission in Pb-Pb Collisions at √sNN = 2.76 TeV
The first measurement of neutron emission in electromagnetic dissociation of 208Pb nuclei at the LHC is presented. The measurement is performed using the neutron Zero Degree Calorimeters of the ALICE experiment, which detect neutral particles close to beam rapidity. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV with neutron emission are σ_single EMD = 187.2±0.2 (stat.) +13.8−12.0 (syst.) b and σ_mutual EMD = 6.2 ± 0.1 (stat.) ±0.4 (syst.) b respectively. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.publishedVersio
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