Metal-as-Insulation HTS coils

In this article, we summarize what we have learned about Metal-as-Insulation (MI) winding behavior and technical challenges. Bailey et al. first proposed the use of Metallic Insulation (MI) for superconducting magnet in 1988 through a U.S. patent. High Temperature Superconductor (HTS) materials are highly thermally stable. This feature compared to classical Low Temperature Superconductor (LTS) enables the use of MI technology to improve the protection against quenches. Gupta was the first to propose the use of a metallic tape in an HTS winding to avoid too much radial currents in No Insulation (NI) in 2011. Hahn et al. presented preliminary results on a pancake sample the same year. We are proposing here to come back on the work done for about 10 years by research groups worldwide and will focus on the turn-to-turn contact resistivity Rct parameter. We will also give details of our LNCMI-CEA-Néel Institute MI HTS insert built in 2018 in the framework of the French National Research Agency (ANR) funding through the NOUGAT project. We tested this magnet many times between 2018 and 2021 and learnt a lot on this technology. This magnet is the first REBCO solenoid of this size using this technology and tested intensively at such high magnetic field (up to 32.5 T) so far. In this magnet, we firstly include a magnetic shielding technology consisting of REBCO NI turns inside the overbanding of each pancake. We give some details and effect of such technology inside an HTS MI insert in case of a fast discharge, a quench or an outsert failure. Finally, we discuss about the self-protection feature of MI coils and we propose a passive protection way for high Rct values.

Determination of the force characteristic of head car’s passive safety system – large road vehicle interaction in a collision

One of the priorities of the National Economic Strategy of Ukraine for the Period up to 2030 is the development of the transport sector, in particular railway vehicle renewal, the introduction of high-speed railway passenger transport, and railway traffic safety improvement. The home motor-car trains must be renewed in compliance with new home standards harmonized with European ones, among which one should mention the Ukrainian State Standard DSTU EN 15227, which specifies the passive safety of a passenger train in its emergency collisions with different obstacles. New car designs must provide not only effective up-to-date braking systems to prevent emergency collisions, but also passive safety systems with energy-absorbing devices. The main purpose of these devices is to reduce the longitudinal forces in the intercar connections and the car accelerations to an acceptable level for the three collision scenarios specified in the DSTU EN 15227. The Department of Statistical Dynamics and Multidimensional Mechanical Systems Dynamics, Institute of Technical Mechanics of the National Academy of Sciences of Ukraine and the State Space Agency of Ukraine, developed a passive protection concept for home high-speed passenger trains in emergency collisions by the DSTU EN 15227 scenarios, proposals on the passive protection of a motor-car train head car, and honeycomb designs of lower- and upper-level energy-absorbing devices (EAD 1 and UL EAD, respectively), which are integrated into the head car front part and serve to damp the major part of the impact energy in front collisions with obstacles. This paper considers DSTU EN 15227 Scenario 3: a collision of a reference motor-car train at a speed of 110 km/h at a railway crossing with a large 15 t road vehicle, which is simulated as a large-size deformable obstacle (LSDO). The aim of the paper is to determine the force characteristic of the interaction of energy-absorbing devices mounted on the head car front part with a large road vehicle in a collision to assess the compliance of the proposed passive protection with the normative requirements. Finite-element models were constructed to analyze the plastic deformation of the elements of the EAD 1 – LSDO, UL EAD – LSDO, and EAD 1 – UL EAD –LSDO systems in a collision with account for geometric and physical nonlinearities, steel dynamic hardening as a function of the impact speed, and varying contact interaction between the elements of the systems considered. The studies conducted made it possible to determine the force characteristics of energy-absorbing device – obstacle interaction and the total characteristic of the contact force between two lower-level devices and two upper-level ones as a function of the obstacle center of mass displacement in a collision. The proposed mathematical models and the calculated force characteristics may be used in the study of the dynamics of a reference motor-car train – large road vehicle collision with the aim to assess the compliance of the passive protection of the home head car under design with the DSTU EN 15227 requirements.

Mucosal memory T cells in breastmilk are modulated by SARS-CoV-2 mRNA vaccination

We compared the phenotype, diversity, and antigen specificity of T cells in the breastmilk and peripheral blood of lactating individuals who received SARS-CoV-2 mRNA vaccination. Relative to blood, breastmilk contained higher frequencies of T effector and central memory populations that expressed mucosal-homing markers. T cell receptor (TCR) sequence overlap was limited between blood and breastmilk. Overabundant breastmilk clones were observed in all individuals, were structurally diverse, and contained CDR3 sequences with known epitope specificity including to SARS-CoV-2 Spike. Spike-specific TCRs were more frequent in breastmilk compared to blood and expanded in breastmilk following a third mRNA vaccine dose. Our observations indicate that the lactating breast contains a distinct T cell population that can be modulated by maternal vaccination with potential implications for infant passive protection.SummaryThe breastmilk T cell repertoire is distinct and enriched for SARS-CoV-2 Spike-specificity after maternal mRNA vaccination.

Evaluasi Sistem Tanggap Darurat Kebakaran Dan Preparedness (Kesiapan) Sebagai Langkah Penanggulangan Kondisi Darurat Kebakaran Di Rumah Sakit 3m Plus Tembilahan

Kasus kebakaran di Rumah Sakit masih tergolong tinggi dan ini sangat merugikan baik untuk pihak Rumah Sakit maupun pengunjung atau pasien yang berobat. maka diperlukan sistem tanggap darurat yang baik dalam menghadapi situasi darurat terutama kebakaran, maka dari itu tujuan dari penelitian ini adalah untuk mengetahui sistem tanggap darurat kebakaran serta bagaimana implementasi prosedur operasional tanggap darurat (emergency response and preparedness) Rumah Sakit 3M Plus. Jenis Penelitian ini adalah observasional dengan pendekatan kualitatif analitik. Analisa yang digunakan adalah triangulasi sumber, metode dan data. Data yang disajikan dalam bentuk matriks dan narasi. Hasil penelitian menunjukkan bahwa sistem tanggap darurat seperti simulasi kebakaran, sarana penyelamatan, dan kesesuaian penerapan APAR masi perlu dievaluasi dan perlu dibenahi kembali agar menjadi sebuah tindakkan yang tepat sewaktu terjadinya kebakaran. Serta masih ada beberapa yang belum sesuai dengan Standar Nasional Indonesia (SNI) maupun permen PU. Sistem proteksi pasif seperti titik kumpul, pintu darurat, tangga darurat tidak memadai. Fire cases in the hospital are still high and this is very detrimental to both the hospital and visitors or patients who seek treatment. Therefore, a good emergency response system is needed in dealing with emergency situations, especially fires, therefore the purpose of this study is to determine the fire emergency response system and how to implement emergency response and preparedness procedures for 3M Plus Hospital. This type of research is observational with a qualitative analytic approach. The analysis used was the triangulation of sources, methods and data. Data presented in the form of a matrix and narrative. The results showed that emergency response systems such as fire simulations, rescue facilities, and suitability of the application of APAR still need to be evaluated and need to be reorganized so that they become an appropriate action when a fire occurs. And there are still some that are not in accordance with the Indonesian National Standard (SNI) and PU candy. Passive protection systems such as gathering points, emergency exits, emergency stairs are inadequate.

Synthesis based on corn fatty acid and hexamethylenediamine study of imidazolines as preservative fluids

Metal structures depending on the operating conditions, react with the aggressive part of the environment and as a result corrode. This corrosion not only leads to the loss of large amounts of money, but also to ecological problems. Corrosion processes require the development of economically efficient and environmentally safe, highly effective anti-corrosion materials. Therefore, the extension of the service life of metal equipment, the creation of corrosion inhibitors, conservation fluids and lubricants with different compositions to increase the quality and efficiency of work in production processes are promising areas. Extensive research of inhibitors as a means of protection against corrosion in conservation fluids is based on the economic and simple structure of the applied technology. Thus, when using this method, the addition of small amounts of substances with an inhibitory effect to the aggressive system, without any changes in the existing technological system is sufficient for long-term protection of the metal. Therefore, in modern times, the safest method to protect metals from corrosion is a passive protection method that provide inhibitors are widely used. Key words: conservation fluids, inhibitor, imidozalin

Formal Model of IDS Based on BDI Logic

Computer network security is an important aspect of computer science. Many researchers are trying to increase security using different methods, technologies, or tools. One of the most common practices is the deployment of an Intrusion Detection System (IDS). The current state of IDS brings only passive protection from network intrusions, i.e., IDS can only detect possible intrusions. Due to that, the manual intervention of an administrator is needed. In our paper, we present a logical model of an active IDS based on category theory, coalgebras, linear logic, and Belief–Desire–Intention (BDI) logic. Such an IDS can not only detect intrusions but also autonomously react to them according to a defined security policy. We demonstrate our approach on a motivating example with real network intrusions.

Vulnerability of Drop Ceilings in Roadway Tunnels to Fire-Induced Damage

Roadway tunnels often include a reinforced concrete drop ceiling that is hung from the liner to create a plenum that facilitates ventilation and houses utilities. Drop ceiling panels are lightweight compared with the much thicker tunnel liner and can experience significant damage from a fire on the roadway below. This paper examines the flexural response of drop ceiling panels in two representative tunnels to standard fire curves as well as several realistic fires due to vehicular accidents. Standard fire demands as per the Rijkswaterstaat and ASTM E1529 fire curves are uniformly applied to the ceiling panels, and heat exposure contours for typical vehicle fires with heat release rates of 30, 100, and 200 MW are generated from the software CFAST. The finite element analysis software SAFIR is used to evaluate the thermo-mechanical behavior of the ceiling panels when subjected to various thermal demands from the fire below. The analysis results indicate that drop ceiling panels are highly vulnerable to fire-induced damage and potential collapse both during a fire’s active heating phase (from simultaneous loss of capacity and restraint of thermal expansion) and during the subsequent cooling period (from tension that develops when the permanently deformed panel thermally retracts). The potential for fire-induced damage or collapse of the drop ceiling panels can be mitigated by reducing the fire hazard, removing the drop ceiling, or enhancing the fire resistance of the panels via the application of passive protection or structural hardening.