WAKTU GETAR STRUKTUR BANGUNAN GEDUNG DENGAN PEREDAM GETAR EKSTERNAL FLUID VISCOUS DAMPER

Struktur bangunan tahan gempa menjadi solusi dalam perencanaan struktur. Salah satu  solusi yang digunakan untuk meningkatkan kinerja struktur bangunan adalah dengan pemasangan Fluid Viscous Damper (FVD). Penelitian ini menunjukkan waktu getar struktur dengan penambahan  FVD pada sudut-sudut gedung. Struktur gedung yang dibahas adalah struktur gedung beton bertulang 10 lantai berukuran 35 x 35 m dengan fungsi bangunan sebagai perkantoran. Lokasi penempatan Fluid Viscous Damper (FVD) diaplikasikan pada sudut-sudut bangunan. Kemudian dilakukan pemodelan struktur 3 dimensi dengan bantuan software ETABS 2018.  Pemodelan struktur dibuat dalam 2 model, yaitu struktur rangka dan struktur dengan Fluid Viscous Damper (FVD). Waktu getar alami struktur didapat dengan bantuan program ETABS 2018. Waktu getar struktur yang didapat dari pemodelan struktur tanpa peredam dan struktur dengan Fluid Viscous Damper.  Penggunaan FVD pada struktur gedung memberikan penurunan waktu getar struktur hingga 56% lebih rendah dari sistem struktur rangka pada mode ke-1 dan mode ke-2.  Selanjutnya memberikan penurunan waktu getar struktur hingga 89% untuk mode ke-12. Efektifitas penggunaan damper tipe FVD memberikan dampak secara langsung melalui waktu getar struktur

Gradualism vs Cold Turkey : how to establish credibility for the ECB

The paper analyzes the incentive for the ECB to establish reputation by pursuing a restrictive policy right at the start of its operation. The bank is modelled as risk averse with respect to deviations of both inflation and output from her target. The public, being imperfectly informed about the bank’s preferences uses observed inflation as (imperfect) signal for the unknown preferences. Under linear learning rules - which are commonly used in the literature - a gradual build up of reputation is the optimal response. The paper shows that such a linear learning rule is not consistent with efficient signaling. It is shown that in a game with efficient signaling, a cold turkey approach - allowing for deflation - is optimal for a strong bank - accepting high current output losses at the beginning in order to demonstrate its toughness. JEL classification: D 82, E 58Die Arbeit untersucht die Anreize der Europäischen Zentralbank, in der Startphase durch restriktive Politik Reputation aufzubauen. Die Öffentlichkeit kennt die Präferenzen der Zentralbank nicht; sie verwendet die beobachtete Inflationsrate als (imperfektes) Signal. Wird eine lineare Lernregel unterstellt - der Standardfall in der Literatur - erweist es sich als optimal, hohe Inflationserwartungen zumindest teilweise zu akkommodieren und so Reputation nur schrittweise aufzubauen. Die Arbeit zeigt aber, daß eine solche lineare Lernregel mit effizientem Signalverhalten nicht konsistent ist. Bei effizientem Signalisieren kann es für eine harte Zentralbank optimal sein, in der Startphase durch eine sehr restriktive, deflationäre Politik ihre Präferenzen zu offenbaren. JEL classification: D 82, E 5

Gradualism vs Cold Turkey

The paper analyzes the incentive for the ECB to establish reputation by pursuing a restrictive policy right at the start of its operation. The bank is modelled as risk averse with respect to deviations of both inflation and output from her target. The public, being imperfectly informed about the bank’s preferences uses observed inflation as (imperfect) signal for the unknown preferences. Under linear learning rules - which are commonly used in the literature - a gradual build up of reputation is the optimal response. The paper shows that such a linear learning rule is not consistent with efficient signaling. It is shown that in a game with efficient signaling, a cold turkey approach - allowing for deflation - is optimal for a strong bank - accepting high current output losses at the beginning in order to demonstrate its toughness.Die Arbeit untersucht die Anreize der Europäischen Zentralbank, in der Startphase durch restriktive Politik Reputation aufzubauen. Die Öffentlichkeit kennt die Präferenzen der Zentralbank nicht; sie verwendet die beobachtete Inflationsrate als (imperfektes) Signal. Wird eine lineare Lernregel unterstellt - der Standardfall in der Literatur - erweist es sich als optimal, hohe Inflationserwartungen zumindest teilweise zu akkommodieren und so Reputation nur schrittweise aufzubauen. Die Arbeit zeigt aber, daß eine solche lineare Lernregel mit effizientem Signalverhalten nicht konsistent ist. Bei effizientem Signalisieren kann es für eine harte Zentralbank optimal sein, in der Startphase durch eine sehr restriktive, deflationäre Politik ihre Präferenzen zu offenbaren

Identification of a Disease on Cocoa Caused by Fusariumin Sulawesi

A disease presumed to be caused by Fusarium was observed in cocoa open fields with few or without shade trees. Within the population of cocoa trees in the field, some trees had died, some had yellowing leaves and dieback, and the others were apparently healthy. In order to demonstrate Fusarium species as the causal pathogen and to obtain information concerning the incidence of the disease, its distribution and its impact on sustainability of cocoa, isolation of the pathogen, inoculation of cocoa seedlings with isolates and a survey of disease has been conducted. Fusarium was isolated from roots and branches, and inoculated onto cocoa seedlings (one month old) via soil. Symptoms appeared within 3-4 weeks after infection. These symptoms consisted of yellowing of leaves beginning from the bottom until the leaves falldown, and browning internal of vascular tissue. Darkened vascular traces in the petiole characteristic of vascularstreak dieback infection were absent. The occurrence of Fusarium in the field was characterized by the absence of obvious signs of fungal infestation on root of infected trees, yellowing of leaves on twigs, dieback, and tree mortality in severe infestations. Disease incidence could reach 77% and in this situation it was difficult for trees recover from heavy infections or to be regenerated in the farm. The study proves that Fusarium is a pathogen causing dieback and the disease is called as Fusarium vascular dieback (FVD). Its development is apparently enhanced by dry conditions in the field