Analisis Pertumbuhan Kedelai Di Lahan Kering Dengan Aplikasi Bradyrhizobium Japonicum Yang Diinduksi Genistein Dan Pupuk Organik

This study aimed to get the information of soybean growth response on inoculation of B. japonicum induced genistein under dry land. The experiment was conducted in farmer fields at Desa Sambirejo, Langkat on June-September 2012. The study used a factorial randomized block design with two factors and three replications. The first factor is genistein induction treatment consisting of without and genistein (50 μM). The second factor is the treatment of B. japonicum and organic fertilizer consisted of without B. japonicum; B. japonicum; B. japonicum + manure 10 t/ha; B. japonicum straw compost + 10 t/ha; B. japonicum + manure 5 t/ha + straw compost 5 t /ha. The variables observed are plant growth rate, plant growth relative and nett assimilation rate. The results showed that treatment of genistein (50 μM) decreased the plant growth rate 5-6 WAP, plant growth relative 5-6 WAP and nett assimilation rate . Treatment of B. japonicum + manure 5 t/ ha + straw compost 5 t/ ha tent to increase plant growth rate, plant growth relative and nett assimilation rate. The interaction between genistein induction and treatment B. japonicum + organic fertilizer tended to decrease plant growth rate, plant growth relative and nett assimilation rate

Pertumbuhan Dan Produksi Beberapa Varietas Kedelai (Glycine Max L. Merill.) Pada Berbagai Kondisi Air Tanah

Growth and Production of Some Soybean Varieties in Some Groundwater Conditions. The aims of this research was to know the growth and production of some soybean varieties in some groundwater conditions. The research was conducted at the Faculty of Agriculture, kassa House, University of Sumatera Utara, Medan, on February to May 2012, using a randomized block design with two factors and three replications. The first factor was the groundwater conditions with 4 level consisted of 50%, 60%, 70% and 80% of field capacity, the second factors was soybean varieties consisted of Anjasmoro, Sinabung, and Willis. The results showed that treatment of several varieties significantly effect on root length at harvest, and the dry weight of 100 seeds. Groundwater conditions treatments significantly effect on root length at harvest, root dry weight, shoot dry weight, dry weight seeds / plant

Pemanfaatan Multimedia Interaktif pada Model Problem Based Learning dalam Pembelajaran Matematika di Kelas VIII

This study is the use of interactive multimedia on the model of problem-based learning in mathematics. This interactive multimedia present a problem-solving of sueface area and volemu of cubes, blocks, prism and pyramid using a model of problem-based learning in an inovative, exciting, motivating way, and learners can choose the menu according to his needs. The method in this research is a qualitative approach. While data collection techniques used are direct observation technique. The research result that the implementation of learning using interactive multimedia on the model of problem-based learning lasted well and can improve the quality of the learning process, furthermore the learning achievement in mathematics increased after the use of interactive multimedia on the model of problem-based learning that is visible from the percentage of completeness reached 85,71%

Kajian Kuat Tekan Beton Pasca Bakar Dengan Dan Tanpa Perendaman Berdasarkan Variasi Mutu Beton

Penelitian ini dilakukan terhadap mutu beton 15 MPa, 20 MPa, 22 MPa dan 25 MPa dengan sampel berupa kubus 15 cm × 15 cm × 15 cm. Jumlah sampel penelitian pada masing-masing mutu beton sebanyak 9 buah sehingga total keseluruhan sampel penelitian sebanyak 36 buah. Pembakaran dilakukan pada suhu 400oC dan lamanya pembakaran selama 3 jam.Perendaman beton pasca bakar dilakukan selama 14 hari.Hasil dari penelitian ini menunjukkan bahwa berdasarkan variasi mutu beton (15 MPa, 20 MPa, 22 MPa, dan 25 MPa) didapatkan nilai kuat tekan rata-rata pada pada perlakuan standar menghasikan kuat tekan rata-rata sebesar 26,00 MPa, 26,67 MPa, 28,44 MPa dan 29,48 MPa. Pada perlakuan beton pasca bakar dengan perendaman menghasilkan kuat tekan rata-rata sebesar 19,41 MPa, 22,37 MPa, 24,15 MPa dan 25,85 MPa. Sedangkan pada perlakuan beton pasca bakar tanpa perendaman menghasilkan kuat tekan rata-rata sebesar 24,89 MPa, 25,78 MPa, 28,67 MPa dan 30,52 MPa. Penurunan kekuatan beton pasca bakar tanpa perendaman pada mutu beton 15 MPa dan 20 MPa sebesar 4,274% dan 3,333% dan peningkatan pada mutu beton 22 MPa dan 25 MPa sebesar 0,781% dan 3,518%. Penurunan kekuatan beton pasca bakar dengan perendaman sebesar 25,356%, 16,111%, 15,104% dan 12,312%

Visible-light-enhanced gating effect at the LaAlO₃/SrTiO₃ interface

Electrical field and light-illumination have been two most widely used stimuli in tuning the conductivity of semiconductor devices. Via capacitive effect electrical field modifies the carrier density of the devices, while light-illumination generates extra carriers by exciting trapped electrons into conduction band1. Here, we report on an unexpected light illumination enhanced field effect in a quasi-two-dimensional electron gas (q2DEG) confined at the LaAlO3/SrTiO3 (LAO/STO) interface which has been the focus of emergent phenomenon exploration2-14. We found that light illumination greatly accelerates and amplifies the field effect, driving the field-induced resistance growth which originally lasts for thousands of seconds into an abrupt resistance jump more than two orders of magnitude. Also, the field-induced change in carrier density is much larger than that expected from the capacitive effect, and can even be opposite to the conventional photoelectric effect. This work expands the space for novel effect exploration and multifunctional device design at complex oxide interfaces

Extreme Sensitivity to Detuning for Globally Coupled Phase Oscillators

Peter Ashwin, Oleksandr Burylko, Yuri Maistrenko, and Oleksandr Popovych, Physical Review Letters, Vol. 96, p. 054102 (2006). "Copyright © 2006 by the American Physical Society."We discuss the sensitivity of a population of coupled oscillators to differences in their natural frequencies, i.e., to detuning. We argue that for three or more oscillators, one can get great sensitivity even if the coupling is strong. For N globally coupled phase oscillators we find there can be bifurcation to extreme sensitivity, where frequency locking can be destroyed by arbitrarily small detuning. This extreme sensitivity is absent for N=2, appears at isolated parameter values for N=3 and N=4, and can appear robustly for open sets of parameter values for ≥ 5 oscillators