Uranium(III) coordination chemistry and oxidation in a flexible small-cavity macrocycle

U(III) complexes of the conformationally flexible, small-cavity macrocycle trans-calix[2]benzene[2]pyrrolide (L)2–, [U(L)X] (X = O-2,6-tBu2C6H3, N(SiMe3)2), have been synthesized from [U(L)BH4] and structurally characterized. These complexes show binding of the U(III) center in the bis(arene) pocket of the macrocycle, which flexes to accommodate the increase in the steric bulk of X, resulting in long U–X bonds to the ancillary ligands. Oxidation to the cationic U(IV) complex [U(L)X][B(C6F5)4] (X = BH4) results in ligand rearrangement to bind the smaller, harder cation in the bis(pyrrolide) pocket, in a conformation that has not been previously observed for (L)2–, with X located between the two ligand arene rings

IMPLEMENTASI MODEL AUTOREGRESSIVE INTEGRATED MOVING AVERAGE (ARIMA) UNTUK PERAMALAN JUMLAH PENUMPANG KAPAL LAUT DI PELABUHAN AMBON

Sebagai daerah berciri kepulauan yang terdiri lebih dari seribu pulau besar dan kecil, Maluku membutuhkan trasportasi sebagai media pergerakan orang dan barang, salah satunya adalah kapal laut. Kapal laut menjadi transportasi alternative bagi masyarakat, sehingga dalam realitanya tidak jarang penambahan kapal guna mengantisipasi terjadinya lonjakan penumpang. Penelitian ini membahas tentang pemodelan dan peramalan jumlah penumpang kapal laut di pelabuhan Ambon dengan menggunakan pendekatan model Autoregressive Integreted Moving Average (ARIMA). Penelitian ini menggunakan data jumlah penumpang kapal laut PT. (Persero) Pelabuhan Indonesia IV Ambon dari januari 2009 sampai dengan desember 2019. Model ARIMA terbaik untuk peramalan adalah model yang memenuhi syarat signifikansi parameter, white noise dan memiliki MSE (Mean Square Error) yang terkecil. Hasil analisis menunjukkan model terbaik untuk peramalan jumlah penumpang kapal di pelabuhan kota Ambon adalah model ARIMA (2,1,3) dengan nilai MSE 355923344. Dengan demikian model ARIMA (2,1,3) cocok untuk digunaka dalam peramalan jumlah penumpang kapal laut di pelabuhan kota Ambon

Deriving Event Logs from Legacy Software Systems

Abstract. The modernization of legacy software systems is one of the key challenges in software industry, which requires comprehensive system analysis. In this context, process mining has proven to be useful for understanding the (business) processes implemented by the legacy software system. However, process mining algorithms are highly dependent on both the quality and existence of suitable event logs. In many scenarios, existing software systems (e.g., legacy applications) do not leverage process engines capable of producing such high-quality event logs, which hampers the application of process mining algorithms. Deriving suitable event log data from legacy software systems, therefore, constitutes a relevant task that fosters data-driven analysis approaches, including process mining, data-based process documentation, and process-centric software migration. This paper presents an approach for deriving event logs from legacy software systems by combining knowledge from source code and corresponding database operations. The goal is to identify relevant business objects as well as to document user and software interactions with them in an event log suitable for process mining

ANALISIS KANDUNGAN MIKROPLASTIK PADA USUS IKAN TUNA MATA BESAR (Thunnus obesus) YANG DIDARATKAN DI PELABUHAN IKAN WAKATOBI

Pencemaran plastik memiliki efek terhadap perairan laut dan terbatasnya informasi mengenai dampak terhadap saluran pencernaan ikan migrasi. Oleh karena itu, penelitian ini bertujuan untuk menganalisis kandungan mikroplastik pada sistem pencernaan ikan yang terletak pada bagian usus dan identifikasi jenis polimer mikroplastik pada daging ikan tuna mata besar yang didaratkan di pelabuhan ikan Wakatobi. Penelitian ini dilaksanakan pada bulan Maret sampai Juli 2020 di Kabupaten Wakatobi. Proses identifikasi kandungan mikroplastik pada usus ikan tuna mata besar dilakukan dengan 4 tahap, yaitu (1) tahap pembedahan ikan, (2) pemisahan densitas, (3) penghilangan senyawa organik, (4) pengamatan visual. Identifikasi jenis polimer mikroplastik pada daging ikan tuna mata besar dianalisis menggunakan fourrier trasform infrared (FTIR). Hasil penelitian menunjukkan bahwa terdapat mikroplastik pada usus ikan tuna mata besar berjumlah dua belas partikel dengan tipe mikroplastik berupa fiber berwarna biru, cokelat dan merah. Ukuran mikroplastik yang ditemukan yaitu 0,701-4,305 mm. Hasil analisis FTIR pada daging ikan menunjukkan senyawa polyethylene ditandai dengan adanya ikatan C=O stretch.Plastic pollution has an effect on marine waters and limited information about the impact on the digestive tracts of migratory fish. Therefore, this study aims to analyze the content of microplastics in the digestive system of fish that are located in the intestines and identify the type of microplastic polymers in the meat of big-eyes tuna fish landed in the port of Wakatobi fish. The research was conducted from March to July 2020 in Wakatobi Regency. The process of identifying the microplastic content in the intestines of bigeyes tuna was carried out in 4 stage, namely (1) fish disscetion, (2) density separation, (3) removal of organic compounds, (4) visual observation. Identification of the type of microplastic polymers in meat of bigeyes tuna was analyzed using fourier transform infrared (FTIR). The results showed that there are microplastics in the intestines of big-eyes tuna fish numbering twelve particles with microplastic types in the form of blue, brown and red fibers. The size of microplastic which found was 0.701-4.305 mm. The results of FTIR analysis on fish meat showed polyethylene compounds marked by the presence of C=O stretch bonds

Probing Neutrino low energy and mass scales

Low energy neutrino processes are ideal probes for new Physics beyond the Standard Model. Cosmological observations and rare nuclear processes can test neutrino mass scales and give definite answers to unsolved basic questions like the Majorana/Dirac nature of the neutrino.Comment: 6 Pages, summary of the ``Probing low energy and mass scales'' session during the Neutrino Oscillation Workshop NOW2006, Otranto, Italy, September 9-16 200

Modules of Abelian integrals and Picard-Fuchs systems

We give a simple proof of an isomorphism between the two $\mathbb{C}[t]$-modules: the module of relative cohomologies $\Lambda^2/dH\land \Lambda^1$ and the module of Abelian integrals corresponding to a regular at infinity polynomial $H$ in two variables. Using this isomorphism, we prove existence and deduce some properties of the corresponding Picard-Fuchs system.Comment: A separate section discusses Fuchsian properties of the Picard-Fuchs system, Morse condition exterminated. Few errors were correcte

SPIDER VII - Revealing the Stellar Population Content of Massive Early-type Galaxies out to 8Re

Radial trends of stellar populations in galaxies provide a valuable tool to understand the mechanisms of galaxy growth. In this paper, we present the first comprehensive analysis of optical-optical and optical-NIR colours, as a function of galaxy mass, out to the halo region (8Re) of early-type galaxies (ETGs). We select a sample of 674 massive ETGs (M*>3x10^10MSun) from the SDSS-based SPIDER survey. By comparing with a large range of population synthesis models, we derive robust constraints on the radial trends in age and metallicity. Metallicity is unambiguously found to decrease outwards, with a measurable steepening of the slope in the outer regions (Re<R<8Re). The gradients in stellar age are found to be more sensitive to the models used, but in general, the outer regions of ETGs feature older populations compared to the cores. This trend is strongest for the most massive galaxies in our sample (M*>10^11MSun). Furthermore, when segregating with respect to large scale environment, the age gradient is more significant in ETGs residing in higher density regions. These results shed light on the processes leading from the formation of the central core to the growth of the stellar envelope of massive galaxies. The fact that the populations in the outer regions are older and more metal-poor than in the core suggests a process whereby the envelope of massive galaxies is made up of accreted small satellites (i.e. minor mergers) whose stars were born during the first stages of galaxy formation.Comment: 20 pages, 13 figures, 10 tables. Accepted for publication in MNRA