330 research outputs found
PENGENALAN KONSEP AGROPOLITAN DI KECAMATAN JUMAPOLO KABUPATEN KARANGANYAR
Agropolitan berarti kota yang fokus pada pertanian. Salah satu kawasan yang memiliki potensi pertanian sangat besar adalah Kecamatan Jumapolo yang terletak di Pulau Jawa bagian tengah. Kecamatan ini terletak di daerah subur sehingga sangat cocok untuk budidaya padi. Pemerintah harus memberikan dukungan teknis untuk membantu penduduk desa mempelajari cara terbaik menggunakan sumber daya yang tersedia dan meningkatkan teknik pertanian mereka. Salah satunya dalam penataan peruntukan ruang pertanian agar ke depan dapat menjamin keberlanjutan aktivitas pertanian dan sebagai stategi dalam beradaptasi dalam era globalisasi saat ini dan masa yang akan datang. Penerapan konsep agriculture adalah sebagai suatu konsep permukiman yang melakukan kegiatan yang memanfaatkan hasil pertanian sebagai bahan baku, merancang, dan menyediakan peralatan serta jasa untuk kegiatan tersebut. Pemilihan konsep ini didasari dari karakteristik wilayah deliniasi yang merupakan pertanian. Dengan adanya konsep yang direncanakan di Kecamatan Jumapolo ini, diharapkan dapat membantu dalam mengatasi permasalahan yang ada dan memanfaat potensi yang dimiliki tanpa mengubah karakteristik yang dimiliki wilayah tersebut. Metode yang digunakan adalah metode deskriptif kualitatif. Metode deskripstif kualitatif ini dilakukan apabila peneliti hendak mengeksplor fenomena pada suatu objek yang tidak dapat dikuantifikasikan yang bersifat deskriptif atau naratif. Kata kunci : agropolitan, agriculture, pertania
Lattice Calculation of Point-to-Point Hadron Current Correlation
Point-to-point correlation functions of hadron currents in the QCD vacuum are
calculated on a lattice and analyzed using dispersion relations, providing
physical information down to small spatial separations. Qualitative agreement
with phenomenological results is obtained in channels for which experimental
data are available, and these correlation functions are shown to be useful in
exploring approximations based on sum rules and interacting instantons.Comment: 11 page
Space-Time Evolution of Ultrarelativistic Quantum Dipoles in Quantum Electrodynamics
We discuss space-time evolution of ultrarelativistic quantum dipole in QED.
We show that the space-time evolution can be described, in a certain
approximation, by means of a regularized wave function, whose parameters are
determined by the process of the dipole creation by a local current. We derive
using these wave functions the dipole expansion law, that is found to coincide
parametrically in the leading order with the one suggested by Farrar,
Frankfurt,Liu and Strikman.Comment: 15 page
Regge poles of the Schwarzschild black hole: a WKB approach
We provide simple and accurate analytical expressions for the Regge poles of
the Schwarzschild black hole. This is achieved by using third-order WKB
approximations to solve the radial wave equations for spins 0, 1 and 2. These
results permit us to obtain analytically the dispersion relation and the
damping of the "surface waves" lying on the photon sphere of the Schwarzschild
black hole and which generate the weakly damped quasinormal modes of its
spectrum. Our results could be helpful in order to simplify considerably the
description of wave scattering from the Schwarzschild black hole as well as the
analysis of the gravitational radiation created in many black hole processes.
Furthermore, the existence of dispersion relations for the photons propagating
close to the photon sphere could have also important consequences in the
context of gravitational lensing.Comment: v2: Minor corrections and consequences in gravitational lensing
briefly discussed. v3: Minor changes to match the published versio
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A holistic framework integrating plant-microbe-mineral regulation of soil bioavailable nitrogen
Soil organic nitrogen (N) is a critical resource for plants and microbes, but the processes that govern its cycle are not well-described. To promote a holistic understanding of soil N dynamics, we need an integrated model that links soil organic matter (SOM) cycling to bioavailable N in both unmanaged and managed landscapes, including agroecosystems. We present a framework that unifies recent conceptual advances in our understanding of three critical steps in bioavailable N cycling: organic N (ON) depolymerization and solubilization; bioavailable N sorption and desorption on mineral surfaces; and microbial ON turnover including assimilation, mineralization, and the recycling of microbial products. Consideration of the balance between these processes provides insight into the sources, sinks, and flux rates of bioavailable N. By accounting for interactions among the biological, physical, and chemical controls over ON and its availability to plants and microbes, our conceptual model unifies complex mechanisms of ON transformation in a concrete conceptual framework that is amenable to experimental testing and translates into ideas for new management practices. This framework will allow researchers and practitioners to use common measurements of particulate organic matter (POM) and mineral-associated organic matter (MAOM) to design strategic organic N-cycle interventions that optimize ecosystem productivity and minimize environmental N loss
Suppression of Raf-1 kinase activity and MAP kinase signalling by RKIP
Raf-1 phosphorylates and activates MEK-1, a kinase that activates the extracellular signal regulated kinases (ERK). This kinase cascade controls the proliferation and differentiation of different cell types. Here we describe a Raf-1-interacting protein, isolated using a yeast two-hybrid screen. This protein inhibits the phosphorylation and activation of MEK by Raf-1 and is designated RKIP (Raf kinase inhibitor protein). In vitro, RKIP binds to Raf-1, MEK and ERK, but not to Ras. RKIP co-immunoprecipitates with Raf-1 and MEK from cell lysates and colocalizes with Raf-1 when examined by confocal microscopy. RKIP is not a substrate for Raf-1 or MEK, but competitively disrupts the interaction between these kinases. RKIP overexpression interferes with the activation of MEK and ERK, induction of AP-1-dependent reporter genes and transformation elicited by an oncogenically activated Raf-1 kinase. Downregulation of endogenous RKIP by expression of antisense RNA or antibody microinjection induces the activation of MEK-, ERK- and AP-1-dependent transcription. RKIP represents a new class of protein-kinase-inhibitor protein that regulates the activity of the Raf/MEK/ERK modul
Diffusive limit for a quantum linear Boltzmann dynamics
In this article, I study the diffusive behavior for a quantum test particle
interacting with a dilute background gas. The model I begin with is a reduced
picture for the test particle dynamics given by a quantum linear Boltzmann
equation in which the gas particle scattering is assumed to occur through a
hard-sphere interaction. The state of the particle is represented by a density
matrix that evolves according to a translation-covariant Lindblad equation. The
main result is a proof that the particle's position distribution converges to a
Gaussian under diffusive rescaling.Comment: 51 pages. I have restructured Sections 2-4 from the previous version
and corrected an error in the proof of Proposition 7.
A unified approach to the derivation of work theorems for equilibrium and steady-state, classical and quantum Hamiltonian systems
We present a unified and simple method for deriving work theorems for
classical and quantum Hamiltonian systems, both under equilibrium conditions
and in a steady state. Throughout the paper, we adopt the partitioning of the
total Hamiltonian into the system part, the bath part, and their coupling. We
rederive many equalities which are available in the literature and obtain a
number of new equalities for nonequilibrium classical and quantum systems. Our
results can be useful for determining partition functions and (generalized)
free energies through simulations and/or measurements performed on
nonequilibrium systems
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