Study on Buffering Performance of Aluminum Foam during Water-entry Process

The structure will suffer a huge overload, when it enters into water. The buffer head cap can effectively reduce the overload, and the buffer material in the cap is the key to its load reduction performance. In order to study the buffering ability of aluminum foam, an effective numerical simulation method is established in this paper. The numerical simulation method can effectively observe the motion of the structure and the energy absorption process of aluminum foam. It is found that the aluminum foam has strong capacity of buffering and reducing load by comparing with the structure without buffer head cap under the same conditions. In the process of energy absorption deformation, it can effectively protect the projectile from buckling deformation.

Dynamics of methyl radical formation by 266 nm photolysis of xylenes and mesitylene

The 266 nm photodissociation of three xylene isomers and mesitylene leading to the formation of methyl radical was examined. The kinetic energy release profiles for the methyl radical were almost identical for all the three isomers of xylene and mesitylene, while substantial differences were observed for the corresponding profiles of the co-fragment produced by loss of one methyl group. This observation be attributed to the formation of the methyl radical from alternate channels. The total kinetic energy distribution profiles were rationalized based on the dissociation of {sp2}C–C{sp3} bond in the cationic state, wherein the {sp2}C–C{sp3} bond dissociation energy is lowered relative to the ground state. The dissocaiton in the cationic state follows a resonant three-photon absorption process, resulting in maximum total kinetic energy of about 1.6 – 1.8 eV for the photofragments. A results in. Fitting of the TKER distribution profiles to empirical function reveals that the dynamics of {sp2}C–C{sp3} bond dissociation is insensitive to the position of substitution but marginally dependent on the number of methyl groups.

PENGELOLAAN ANGGARAN PADA MASA PANDEMI COVID-19 DI KPPBC TMP A MARUNDA DALAM PERSPEKTIF AKUNTANSI

The Covid-19 pandemic has caused dynamics in the budget absorption process, sothat budget revisions are very crucial in determining the absorption rate and work unit operations. This study aims to measure the accuracy of KPPBC TMP A Marunda in preparing the budget and knowing the policies taken in the face of the Covid-19 pandemic. The analytical method used is a qualitative analysis by processing data through interviews, observations, and literature studies. Based on the results of data processing, the budget revision in the 2020 fiscal year was carried out with several themes, including budget revisions in terms of changing budget ceilings, revisions to budget shifts in terms of fixed budget ceilings, and administrative revisions by making budget savings during the Covid-19 pandemic, adding a special account for handling Covid-19 and revision of the minus ceiling. Budget revisions are carried out by paying attention to budget performance against realization and the amount of the budget ceiling. Budget revisions in the context of budget savings to deal with the Covid-19 pandemic are carried out by reducing budgets sourced from accounts that are considered not become a priority. The presentation of the special account for handling Covid-19 in the financial statements does not have a special segment, it is presented as goods expenditure in the budget realization report and presented as goods and services expense in the operational report. Pandemi Covid-19 menyebabkan terjadinya dinamika dalam proses penyerapan anggaran, sehingga revisi anggaran menjadi hal yang sangat krusial dalam menentukan tingkat penyerapan dan operasional satuan kerja. Penelitian ini bertujuan untuk mengukur ketepatan KPPBC TMP A Marunda dalam melakukan penyusunan anggaran dan mengetahui kebijakan yang diambil dalam menghadapi pandemi Covid-19. Metode analisis yang digunakan adalah analisis kualitatif dengan melakukan pengolahan data melalui hasil wawancara, observasi dan studi literatur. Berdasarkan hasil pengolahan data, revisi anggaran pada tahun anggaran 2020 dilakukan dengan beberapa tema, diantaranya revisi anggaran dalam hal pagu anggaran berubah, revisi pergeseran anggaran dalam hal pagu anggaran tetap, dan revisi administrasi dengan melakukan penghematan anggaran selama masa pandemi Covid-19, melakukan penambahan akun khusus penanganan Covid-19 dan revisi pagu minus. Revisi anggaran dilakukan dengan memperhatikan kinerja anggaran terhadap realisasi dan jumlah pagu anggaran, Revisi anggaran dalam rangka penghematan anggaran untuk menghadapi pandemi Covid-19 dilakukan dengan melakukan pengurangan anggaran yang bersumber dari akun yang dianggap tidak prioritas. Penyajian terhadap akun khusus penanganan Covid-19 di laporan keuangan tidak memiliki segmen khusus, disajikan sebagai belanja barang pada laporan realisasi anggaran dan disajikan sebagai beban barang dan jasa pada laporan operasional

Absorbed driven diffusion can provide positive heat and work output

We investigate overdamped Brownian motion in a fluctuating potential on a one-dimensional interval bordered by absorbing boundaries. The potential switches randomly between the ∨-shaped and the ∧-shaped form and is symmetric with respect to the origin. We derive exact expressions describing the absorption process, dynamics and stochastic energetics of the particle. The mean absorption time can exhibit a pronounced minimum as the function of the potential switching rate. Moreover, there exists a parameter region where both the output work and the released heat are positive. We give a plausible explanation for this phenomenon based on typical statistical features of absorbed trajectories. The presented analytical method can be generalized to other models based on dichotomous switching between two potential shapes.