12,137 research outputs found
Pembuatan API untuk Website OMS di Perusahaan B-Log
No full textLaporan ini menjelaskan proses pembuatan API untuk module Order Management System pada PT Trimitra Trans Persada (B-Log). Pada awalnya dalam melakukan pengantaran pesanan, B-log hanya dapat mengantar kepada satu konsumen, dibuatnya module OMS ini agar dapat menambah customer dalam melakukan pengantaran pesanan, salah satu hal yang dibutuhkan dalam pembuatan module adalah API yang dibuat oleh backend engineer. Selama pengerjaanya, API dikembangkan menggunakan Visual Studio Code dan diuji dengan Postman. Bahasa pemrograman yang digunakan adalah Go, dengan framework GORM dan GIN, serta menggunakan database PostgreSQL. Fungsi-fungsi yang terdapat pada API adalah GET dan POST yang diimplementasikan meliputi: GET semua data, GET, GET data berdasarkan tanggal, GET data berdasarkan primary key, POST data dari file Excel, POST API dengan menghapus data berdasarkan primary key, POST API untuk melakukan pembaruan dan pengisian data manual
Interannular proton exchange and fragmentation of carbonyl-protonated benzophenones
No full textSun J, Grützmacher H-F. Interannular proton exchange and fragmentation of carbonyl-protonated benzophenones. Organic Mass Spectrometry. 1991;26(12):1045-1051.Benzophenones a initially protonated at the carbonyl group Were prepared by electron-impact induced dissocation of 1,1-diphenylpropanols (compounds 1-5). These protonated ketones decompose in the ion source and the second field-free region of a reversed geometry mass spectrometer by proton migration to one of the phenyl groups and subsequent elimination of benzene. In the case of derivatives substituted by methoxy groups and trifluoromethyl groups, respectively, the proton migrates predominantly to the more bask benzene ring, resulting in the elimination of anisole in the former case and of benzene in the latter case. A study of protonated benzophenones labelled at the phenyl ring and at the carbonyl group shows that only a few interannular H/D exchange steps precede the fragmentation. This is observed not only for metastable ions in the magnetic sector instrument but also for ions of long lifetimes investigated by Fournier-transform-ion cyclotron resonance (FT-ICR) spectrometry. This is in contrast to the arene elimination from protonated 1,omega-diphenylalkanes and related polyphenylalkanes which fragment by complete positional exchange of all hydrogen atoms at the aromatic rings. The special behaviour of protonated benzophenones is attributed to a low barrier for the decomposition of a chemically activated arenium ion b, which arises from the initial proton transfer. Once b is formed, it decomposes quickly without much interannular proton exchange
Open Access BAFF/APRIL system in pediatric OMS: relation to severity, neuroinflammation, and immunotherapy
No full textBackground: B-cell dysregulation has been implicated but not fully characterized in pediatric opsoclonus-myoclonus syndrome (OMS), a neuroblastoma-associated neuroinflammatory disorder. Objective: To assess the role of B-cell activating factor (BAFF) and a proliferation-inducing ligand (APRIL), two critical B cell-modulating cytokines, as potential biomarkers of disease activity and treatment biomarkers in OMS. Methods: Soluble BAFF and APRIL were measured in cerebrospinal fluid (CSF) and serum by ELISA in 433 children (296 OMS, 109 controls, 28 other inflammatory neurological disorders (OIND)). BAFF-R receptors on circulating CD19 + B cells were measured by flow cytometry. A blinded scorer rated motor severity on the OMS Evaluation Scale. Immunotherapies were evaluated cross-sectionally and longitudinally. Results: The mean CSF BAFF concentration, which was elevated in untreated OMS and OIND, correlated with OMS severity category (P = 0.006), and reduction by adrenocorticotropic hormone or corticotropin (ACTH) (−61%) or corticosteroids (−38%) was seen at each level of severity. In contrast, CSF APRIL was normal in OMS and OIND and unaffected by immunotherapy. When the entire OMS dataset was dichotomized into ‘high ’ versus ‘normal ’ CSF BAFF concentration, the phenotype of the high group included greater motor severity and number of CSF oligoclonal bands, and a higher concentration of inflammatory chemokines CXCL13 and CXCL10 in CSF and CXCL9 and CCL2
Unusual fragmentation of 1,1,2,2,3,3-hexamethylindan. Methyl group equilibration and multi-step skeletal rearrangements in the [M - CH3]+ ions prior to the formation of t-C4H9+ and other fragment ions
No full textKuck D, Mehdizadeh A. Unusual fragmentation of 1,1,2,2,3,3-hexamethylindan. Methyl group equilibration and multi-step skeletal rearrangements in the [M - CH3]+ ions prior to the formation of t-C4H9+ and other fragment ions. Organic Mass Spectrometry. 1992;27(4):443-452.Based on the surprising observation of an intense C4H9+ (m/z 57) peak in the electron impact mass spectrum, the fragmentation of 1,1,2,2,3,3-hexamethylindan (2) was studied by mass-analysed ion kinetic energy Spectrometry of its deuterium-labelled analogues. While methyl loss from ions [2]+ occurs with high selectivity (92%) from the positions 1 and 3 without any rearrangement, ions [2 CH3]+ undergo complete equilibration of the five methyl groups as intact entities. Subsequent multi-step skeletal rearrangement of the [2 - CH3]+ ions leads to formation of tert-butyl ions and to the loss of isobutene and propene, again without concomitant hydrogen exchange. Several kinetic isotope effects and also probably a thermodynamic isotope effect associated with each of these fragmentation processes have been found and their origin is discussed. The possibility of the formation of ion-neutral complexes [t-C4H9+ C10H10] and [s-C3H7+ C11H12] is considered on the basis of the labelling and reactivity pattern
OMS FDIR: Initial prototyping
No full textThe Space Station Freedom Program (SSFP) Operations Management System (OMS) will automate major management functions which coordinate the operations of onboard systems, elements and payloads. The objectives of OMS are to improve safety, reliability and productivity while reducing maintenance and operations cost. This will be accomplished by using advanced automation techniques to automate much of the activity currently performed by the flight crew and ground personnel. OMS requirements have been organized into five task groups: (1) Planning, Execution and Replanning; (2) Data Gathering, Preprocessing and Storage; (3) Testing and Training; (4) Resource Management; and (5) Caution and Warning and Fault Management for onboard subsystems. The scope of this prototyping effort falls within the Fault Management requirements group. The prototyping will be performed in two phases. Phase 1 is the development of an onboard communications network fault detection, isolation, and reconfiguration (FDIR) system. Phase 2 will incorporate global FDIR for onboard systems. Research into the applicability of expert systems, object-oriented programming, fuzzy sets, neural networks and other advanced techniques will be conducted. The goals and technical approach for this new SSFP research project are discussed here
Synthesis and structural characterization of cerium incorporated manganese oxide OMS-2 type catalysts
No full text2214-2217Cerium incorporated ordered phase of manganese
oxide OMS (octahedral molecular sieve) materials have been synthesized by ion
exchange and hydrothermal methods. The cerium incorporated OMS-2 type catalysts
have been prepared from potassium birnessite as well as from potassium containing
cryptomelane. XRD, TGA, BET and SEM analyses have been
used to characterize the cerium incorporated
manganese oxide OMS-2 materials
Existence and Classifications of -contact structures
No full textA b-contact structure on a b-manifold (M, Z) is a singular Jacobi structure on M satisfying a transversality condition along the hypersurface Z. We show that, in three dimensions, b-contact structures with overtwisted three-dimensional leaves satisfy an existence h-principle that allows prescribing the induced singular foliation. The existence of b-contact structures with tight leaves of maximal dimension is also established. We give a method to classify b-contact structures on a given b-manifold and use it to give a classification on S 3 with either a two-sphere or an unknotted torus as the critical surface. We also discuss generalizations to higher dimensions
Existence and classification of -contact structures
No full textA -contact structure on a -manifold is a Jacobi structure on satisfying a transversality condition along the hypersurface . We show that, in three dimensions, -contact structures with overtwisted three-dimensional leaves satisfy an existence -principle that allows prescribing the induced singular foliation. We give a method to classify -contact structures on a given -manifold and use it to give a classification on with either a two-sphere or an unknotted torus as the critical surface. We also discuss generalizations to higher dimensions.35 pages. Final version to appear in Publicacions Matemàtique
Existence and Classifications of -contact structures
No full textA b-contact structure on a b-manifold (M, Z) is a singular Jacobi structure on M satisfying a transversality condition along the hypersurface Z. We show that, in three dimensions, b-contact structures with overtwisted three-dimensional leaves satisfy an existence h-principle that allows prescribing the induced singular foliation. The existence of b-contact structures with tight leaves of maximal dimension is also established. We give a method to classify b-contact structures on a given b-manifold and use it to give a classification on S 3 with either a two-sphere or an unknotted torus as the critical surface. We also discuss generalizations to higher dimensions
Effect of reducing agent on the structure and activity of manganese oxide octahedral molecular sieve (OMS-2) in catalytic combustion of o-xylene
No full textManganese oxide octahedral molecular sieve (OMS-2) with different microstructures were synthesized via simple wet chemical methods of KMnO\u2084/benzyl alcohol and KMnO\u2084/Mn(NO\u2083)\u2082 at room-temperature (the products were denoted as B-OMS-2 and N-OMS-2, respectively). The physicochemical properties of the materials were characterized using numerous analytical techniques. The catalytic activities of the catalysts were evaluated for the complete catalytic oxidation of a typical volatile organic compound (VOCs), o-xylene. It was found that B-OMS-2 presented a loose structure, and contained almost 100% Mn\u2074\u207a, while N-OMS-2 possessed a mixture of Mn\u2074\u207a and Mn\ub3\u207a. H\u2082-TPR and O\u2082-TPO analyses showed that B-OMS-2 exhibited good low-temperature reducibility and high oxygen exchange ability with gas phase oxygen. The microstructure difference was caused by different reducing reagents used in the synthesis. Benzyl alcohol might adsorb on the surface of MnO\u2082 nuclei acting as a ligand and/or structure-directing agent, and the desorption of the organic compound led to the formation of bulk oxygen vacancy in B-OMS-2. B-OMS-2 could convert 100% o-xylene into CO\u2082 at 190 \ub0C at a space velocity of 8000 h\u207b\ub9, 50 \ub0C lower than N-OMS-2. The excellent catalytic performance of B-OMS-2 might be caused by its bulk oxygen vacancy, potent reducibility and high re-oxidation ability. It is believed that B-OMS-2 is a promising catalyst for the elimination of VOCs from air.In press: YesPeer reviewed: YesNRC publication: Ye
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