93 research outputs found
Cavity dumping of an injection-locked free-electron laser
This letter reports cavity dumping of an electrostatic-accelerator-driven
free-electron laser (FEL) while it is injection-locked to a
frequency-stabilized 240 GHz solid-state source. Cavity dumping enhances the
FEL output power by a factor of 8, and abruptly cuts off the end of the
FEL pulse. The cavity-dumped, injection-locked FEL output is used in a 240 GHz
pulsed electron spin resonance (ESR) experiment.Comment: 8 pages including 3 figure
Essays on asset pricing and financial regulation
I show that when the banking sector’s assets comprise large excess reserves and loans, jointly determined capital regulation and interest-on-excess-reserves (IOER) policies provide welfare gains. In general equilibrium, falling IOER is associated with a proportional fall in deposit rate only when IOER is above the zero bound. This leads to a faster fall in the bank’s interest expenses than its interest incomes. Given any lending level, lower net interest expenses enhance bank solvency. Nonetheless, the risk-weighted capital regulation remains unchanged and hence becomes socially costly. I show that jointly determined policies achieve welfare gains by loosening the capital requirement and lowering IOER to expand the credit flow, while bank failure likelihood remains constant. Conversely, lowering IOER below the zero bound is associated with a nonresponsive deposit rate that leads to growing net interest expenses and worsening bank solvency. In that case, I show that a stricter capital constraint together with a lower IOER provide social value.
The aftermath of the financial crisis inherited heightened economic uncertainty and low productivity. These features prompted the banking sectors across the developed economies to rely heavily on excess reserves offered by the central banks despite the negative nominal IOER policy rate. Nonetheless, the negative relationship between the overall interest expenses of the banking sector with the IOER around the zero lower bound further exacerbates the over-reliance on excess reserves particularly when rates are negative. Financial regulator faces a trade-off between the costly failure of an under-capitalized banking system and costs generated by interconnections between interest expenses on oversized excess reserves and government guarantees to depositors. I show that first, the risk-weighted optimal capital regulation exhibits a negative correlation with the IOER policy rate, and second present a socially optimal financial regulation that balances the social gains of negative IOER rate, generated by reduced over-reliance on idle reserves, against its social costs, generated by the increased default likelihood of the banking institutions.Open Acces
Sub-MHz Linewidth at 240 GHz from an Injection-Locked Free-Electron Laser
Radiation from an ultra-stable 240 GHz solid-state source has been injected,
through an isolator, into the cavity of the University of California Santa
Barbara (UCSB) MM-wave free-electron laser (FEL). High-power FEL emission,
normally distributed among many of the cavity's longitudinal modes, is
concentrated into the single mode to which the solid state source has been
tuned. The linewidth of the FEL emission is 0.5 MHz, consistent with the
Fourier transform limit for the 2 microsecond pulses. This demonstration of
frequency-stable, ultra-narrow-band FEL emission is a critical milestone on the
road to FEL-based pulsed electron paramagnetic resonance spectroscopy.Comment: 3 pages including 3 figure
Phimosis post-circumcisi: Laporan Kasus
keywords: preputium, kuman anerob, vibrio, spirochete
Perencanaan dan Pengendalian Modal Kerja pada PT. Gelagar Indah Utama Medan
Modal kerja merupakan salah satu faktor yang menentukan perkembangan
dan kelangsungan hidup perusahaan guna membiayai operasi perusahaan sehari-hari.
Konsep modal kerja dari dana adalah kelebihan aktiva lancar seluruhnya dari
suatu perusahaan atas kewajiban lancarnya secara keseluruhan pada waktu tertentu
dapat disebut aktiva lancar bersih atau modal kerja bersih.
Tujuan dari perencanaan dan pengendalian modal kerja adalah agar modal kerja
yang digunakan perusahaan dapat membuahkan hasil yang memuaskan, tentunya
menghasilkan laba yang telah ditargetkan dan untuk mengetahui bagaimana dana
yang digunakan atau bagaimana kebutuhan dana tersebut dibelanjaka
SISTEM PAKAR DENGAN MENGGUNAKAN METODE DEMPSTER SHAFER UNTUK MENDETEKSI JENIS PERILAKU ABNORMAL ADHD (ATTENTION DEFICIT HYPERACTIVITY DISORDER) PADA ANAK
Minimnya pengetahuan publik tentang perilaku abnormal berakibat perilaku-perilaku abnormal yang
ada dan tampak sering dipahami secara keliru, bahkan tidak jarang penyandang perilaku abnormal
diperlakukan secara tidak manusiawi. Salah satu bentuk perilaku abnormal tersebut adalah ADHD
(Attention Deficit Hyperactivity Disorder) atau gangguan pemusatan perhatian pada anak. Pada
penelitian ini, sistem pakar untuk mendeteksi jenis perilaku ADHD memberikan kesimpulan tentang
jenis penyakit yang diderita dan tingkat keyakinannya. Digunakan metode Dempster Shafer sebagai
metode untuk menghitung nilai kepercayaan atas gejala-gejala yang dipilih pasien. Dengan cara
membandingkan setiap nilai bobot dari 2 gejala awal yang dipilih untuk seterusnya dibandingkan
dengan nilai bobot gejala-gejala lain, sehingga menghasilkan gejala baru yang mengaju kepada suatu
penyakit disertai dengan nilai keyakinannya. Sistem ini diimplementasikan dengan menggunakan
bahasa pemograman Microsoft Visual Basic.Net dan dengan menggunakan database Microsoft Access
2013. Hasil pengujian dengan persentase sebesar 85% menunjukkan bahwa sistem pakar ini mampu
mendeteksi jenis perilaku ADHD (Attention Deficit Hyperactivity Disorder) yang diderita anak disertai
dengan nilai keyakinan Dempster Shafer
Free vibration analysis of sandwich plates with compressible core in contact with fluid
In this paper, the extended higher-order sandwich plate's theory (EHSAPT) is used to analyze the free vibration of the sandwich plate with compressible core and different boundary conditions in contact with fluid. First-order shear deformation theory is adopted for the top and bottom face sheets, while the in-plane and transverse displacements of the core are considered to be cubic and quadratic functions of the transverse coordinate, respectively. A single series is considered with two-variable orthogonal polynomials as a set of admissible functions satisfying the boundary conditions. Besides, the fluid is considered to be irrotational, inviscid and incompressible. By taking into account the boundary conditions and compatibility conditions, the fluid velocity potential is acquired. The natural frequencies of the system are calculated by the Rayleigh-Ritz method. An excellent accuracy is obtained between the results in the available literature and the present method. Finally, the effects of various parameters including boundary conditions, side-to-thickness ratio, thickness of the core to thickness of the face sheets ratio, face sheet to core flexural modulus ratio, dimensions of the container, and aspect ratios on the natural frequencies of the sandwich plate are presented and discussed in detail
Free vibration analysis of rectangular sandwich plates with compressible core and various boundary conditions
Extended higher-order sandwich plate theory is used to analyze the free vibrations of rectangular sandwich plates with compressible core. Accordingly, first-order shear deformation theory is used to model the laminated face sheets. Besides, the in-plane and transverse displacements of the core are assumed to be cubic and quadratic functions of the thickness coordinate, respectively. To deduce the governing equations, Hamilton’s principle is used. Then, based on the Rayleigh-Ritz method, single series expansions with two-variable orthogonal polynomials – namely, the orthogonal plate functions – are considered to approximate the displacement components. Lastly, a generalized eigenvalue problem is solved to obtain the free vibrational characteristics of sandwich plates with both symmetric and anti-symmetric lay-ups subjected to various boundary conditions. The method is validated against the results obtained by different methods in the literature. Finally, the effects of the plate side-to-thickness ratio, in-plane aspect ratio, and core-to-face sheets thickness ratio on the natural frequencies are discussed
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