Pengujian Kuat Lentur Balok Beton Bertulang Dengan Variasi Ratio Tulangan Tarik

Beton bertulang adalah bahan yang sangat luas dipakai dalam perencanaan konstruksi, dan diketahui banyak sekali parameter yang ada dalam pembentukan elemen beton bertulang seperti tinggi, lebar, luas penulangan, regangan baja, regangan beton, tegangan baja dan sebagainya. Tulisan ini menyajikan hasil penelitian mengenai hubungan antara jumlah tulangan tarik pada balok beton bertulang dan kekuatan lentur balok tersebut. Dari hasil penelitian eksperimential di laboratorium terhadap balok beton bertulang yang diberikan variasi tulangan tarik, maka diperoleh suatu nilai kekuatan lentur balok yang berbeda pula. Hasil penelitian menunjukan bahwa semakin besar ratio tulangan tarik maka semakin besar pula kekuatan lentur yang didapat. Dalam penelitian ini menunjukan efisiensi penulangan dimana kita harus memperhatikan besar benda uji yang digunakan serta alat tes yang akan digunakan, karena pada pengujian ini menggunakan alat tes lentur hidrolik maka beban saat runtuh belum tercapai yang artinya pada saat baja memberikan kekuatan lawan beton sudah hancur duluan dan mesin berhenti otomatis. Untuk itu perlu adanya mesin lentur yang bekerja hingga menghasilkan beban maksimum atau beban runtuh agar bias dilihat kemampuan maksmimal dari balok tersebut

PENGUJIAN KUAT LENTUR BALOK BETON BERTULANG DENGAN VARIASI RATIO TULANGAN TARIK

Beton bertulang adalah bahan yang sangat luas dipakai dalam perencanaan konstruksi, dan diketahui banyak sekali parameter yang ada dalam pembentukan elemen beton bertulang seperti tinggi, lebar, luas penulangan, regangan baja, regangan beton, tegangan baja dan sebagainya. Tulisan ini menyajikan hasil penelitian mengenai hubungan antara jumlah tulangan tarik pada balok beton bertulang dan kekuatan lentur balok tersebut. Dari hasil penelitian eksperimential di laboratorium terhadap balok beton bertulang yang diberikan variasi tulangan tarik, maka diperoleh suatu nilai kekuatan lentur balok yang berbeda pula. Hasil penelitian menunjukan bahwa semakin besar ratio tulangan tarik maka semakin besar pula kekuatan lentur yang didapat. Dalam penelitian ini menunjukan efisiensi penulangan dimana kita harus memperhatikan besar benda uji yang digunakan serta alat tes yang akan digunakan, karena pada pengujian ini menggunakan alat tes lentur hidrolik maka beban saat runtuh belum tercapai yang artinya pada saat baja memberikan kekuatan lawan beton sudah hancur duluan dan mesin berhenti otomatis. Untuk itu perlu adanya mesin lentur yang bekerja hingga menghasilkan beban maksimum atau beban runtuh agar bias dilihat kemampuan maksmimal dari balok tersebut. Kata kunci : Beton,Kuat Lentur, Tulangan Tari

Genetic variability and association study of SSR markers for yield and powdery mildew disease in pea (Pisum sativum)

Makhyatmubi, one of the most popular local varieties of field pea (Pisum sativum L.) in Manipur has morpho- physiological bottlenecks such as tall nature and high susceptibility to fungus Erysiphe pisi causing powdery mildew disease. Therefore, an experiment was conducted during winter (rabi) seasons of 2018–19 and 2020–21 at College of Post-Graduate Studies in Agricultural Sciences (Central Agricultural University, Imphal, Manipur), Umiam, Meghalaya to generate genetic variability by hybridization of Makhyatmubi with Prakash variety which is a well-known powdery mildew resistant variety in India and possesses several contrasting characters. Fruitful heterosis was estimated with highest record in number of pods per plant (114.75%) and seed yield per plant (108.04%). These two characters also showed high PCV, GCV, heritability and GAM. Number of pods per plant (0.95) was found to have highest positive significant correlation with seed yield per plant. MP-5 and MP-119 recorded superior performance in several characters under study. For the association study of simple sequence repeats (SSR) markers, easily scorable polymorphic markers were selected for surveying association with the traits. Results revealed that SSR marker AA122 may be associated with seed yield and number of pods per plant while marker AA136 with number of seeds per pod. A5 marker was found to be associated with the powdery mildew disease. Hence, it can be employed for marker assisted selection (MAS) to identify and select pea genotypes exhibit resistance to powdery mildew disease

Possible implications of the channeling effect in NaI(Tl) crystals

The channeling effect of low energy ions along the crystallographic axes and planes of NaI(Tl) crystals is discussed in the framework of corollary investigations on WIMP Dark Matter candidates. In fact, the modeling of this existing effect implies a more complex evaluation of the luminosity yield for low energy recoiling Na and I ions. In the present paper related phenomenological arguments are developed and possible implications are discussed at some extent.Comment: 16 pages, 10 figures, preprint ROM2F/2007/15, submitted for publicatio

Representation of target-bound drugs by computed conformers: implications for conformational libraries

BACKGROUND: The increasing number of known protein structures provides valuable information about pharmaceutical targets. Drug binding sites are identifiable and suitable lead compounds can be proposed. The flexibility of ligands is a critical point for the selection of potential drugs. Since computed 3D structures of millions of compounds are available, the knowledge of their binding conformations would be a great benefit for the development of efficient screening methods. RESULTS: Integration of two public databases allowed superposition of conformers for 193 approved drugs with 5507 crystallised target-bound counterparts. The generation of 9600 drug conformers using an atomic force field was carried out to obtain an optimal coverage of the conformational space. Bioactive conformations are best described by a conformational ensemble: half of all drugs exhibit multiple active states, distributed over the entire range of the reachable energy and conformational space. A number of up to 100 conformers per drug enabled us to reproduce the bound states within a similarity threshold of 1.0 Å in 70% of all cases. This fraction rises to about 90% for smaller or average sized drugs. CONCLUSION: Single drugs adopt multiple bioactive conformations if they interact with different target proteins. Due to the structural diversity of binding sites they adopt conformations that are distributed over a broad conformational space and wide energy range. Since the majority of drugs is well represented by a predefined low number of conformers (up to 100) this procedure is a valuable method to compare compounds by three-dimensional features or for fast similarity searches starting with pharmacophores. The underlying 9600 generated drug conformers are downloadable from the Super Drug Web site [1]. All superpositions are visualised at the same source. Additional conformers (110,000) of 2400 classified WHO-drugs are also available

Differential cross-section measurements for the electroweak production of dijets in association with a Z boson in proton–proton collisions at ATLAS

Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UA

Evidence for tt¯ tt¯ production in the multilepton final state in proton–proton collisions at √s=13 TeV with the ATLAS detector

A search is presented for four-top-quark production using an integrated luminosity of 139 fb- 1 of proton–proton collision data at a centre-of-mass energy of 13TeV collected by the ATLAS detector at the LHC. Events are selected if they contain a same-sign lepton pair or at least three leptons (electrons or muons). Jet multiplicity, jet flavour and event kinematics are used to separate signal from the background through a multivariate discriminant, and dedicated control regions are used to constrain the dominant backgrounds. The four-top-quark production cross section is measured to be 24-6+7 fb. This corresponds to an observed (expected) significance with respect to the background-only hypothesis of 4.3 (2.4) standard deviations and provides evidence for this process

Search for new phenomena in multi-body invariant masses in events with at least one isolated lepton and two jets using √s = 13 TeV proton–proton collision data collected by the ATLAS detector

A search for resonances in events with at least one isolated lepton (e or μ) and two jets is performed using 139 fb −1 of s = 13 TeV proton–proton collision data recorded by the ATLAS detector at the LHC. Deviations from a smoothly falling background hypothesis are tested in three- and four-body invariant mass distributions constructed from leptons and jets, including jets identified as originating from bottom quarks. Model-independent limits on generic resonances characterised by cascade decays of particles leading to multiple jets and leptons in the final state are presented. The limits are calculated using Gaussian shapes with different widths for the invariant masses. The multi-body invariant masses are also used to set 95% confidence level upper limits on the cross-section times branching ratios for the production and subsequent decay of resonances predicted by several new physics scenarios. [Figure not available: see fulltext.]