A Time-Domain z−1 Circuit with Digital Calibration

This paper presents a novel circuit of a z−1 operation which is suitable, as a basic building block, for time-domain topologies and signal processing. The proposed circuit employs a time register circuit which is based on the capacitor discharging method. The large variation of the capacitor discharging slope over technology process and chip temperature variations which affect the z−1 accuracy is improved using a novel digital calibration loop. The circuit is designed using a 28 nm Samsung FD-SOI process under 1 V supply voltage with 5 MHz sampling frequency. Simulation results validate the theoretical analysis presenting a variation of capacitor voltage discharging slope less than 5% over worst-case process corners for temperature between 0 °C and 100 °C while consuming only 30 μA. Also, the worst-case accuracy of z−1 operation is better than 33 ps for input pulse widths between 5 ns and 45 ns presenting huge improvement compared with the uncalibrated operator.

Teknologi Produksi Abon Daging Rusa Dengan Penambahan Herbal Sebagai Pangan Unggulan Pada Era Normal Baru

This study aims to improve the nutritional quality of venison floss by modifying the the technology process of floss making with adding red fruit oil (Pandanus conoideus L) and kebar grass extract (Biophytum petersianum) as a source of natural antioxidants. The results showed that the nutritional value of floss was influenced by the use of these herbal. Supplementation of antioxidant is to potentially extend the shelf-life of floss as indicated in decreasing the value of water activity (Aw) and thiobarburic acid (TBA). The Aw value decreased from 0.756 to 0.701, and TBA decreased from 0.139 to 0.055 mg/kg. The protein of floss increased from 33.20 to 35.60%. The result also showed that the content of antioxidant increased which is indicated by the increasing of beta-carotene content from 0.0087 mg /100 gram to 0.81 mg/100 gram. Results also showed that the use of red fruit oil extract and kebar grass extract decreased the content of saturated fatty acids, meanwhile in unsaturated fatty acids it increased arachidonic fatty acids. Keywords: Antioxidant; Beta-caroten; Kebar grass; Red-fruit oil; Venison floss. Abstrak Penelitian ini bertujuan meningkatkan kualitas nutrisi abon daging rusa dengan memodifikasi proses teknologi produksinya dengan penambahan ekstrak minyak buah merah (Pandanus conoideus L) dan ekstrak rumput kebar (Biophytum petersianum) sebagai sumber antioksidan alami. Hasil penelitian memperlihatkan bahwa nilai nutrisi produk olahan daging dipengaruhi oleh adanya penambahan senyawa antioksidan. Pemberian suplementasi bahan sumber antioksidan meningkatkan daya awet pada abon yang ditunjukkan dengan penurunan nilai aktivitas air (Aw) dan nilai thiobarburic acid (TBA). Nilai Aw abon menurun dari 0,756 menjadi 0,701, dan nilai TBA-nya menurun dari 0,139 menjadi 0,055 mg/kg. Nilai nutrisi terjadi pada nilai protein yang meningkat dari 33,20 menjadi 35,60%. Sebagai sumber antioksidan terlihat pada peningkatan kandungan beta-karoten dari 0,0087 mg/100 gram menjadi 0,81 mg/100 gram. Faktor penting lainnya dengan penggunaan ekstrak minyak buah merah dan ekstrak rumput kebar yakni adanya penurunan yang signifikan pada kandungan asam-asam lemak jenuh, akan tetapi pada asam-asam lemak tidak jenuh terjadi peningkatan pada asam lemak arakidonat. Kata kunci: Abon rusa; Beta-karoten; Herbal antioksidant; Minyak buah-merah; Rumput kebar.

Managerial Controversies in Artificial Intelligence and Big Data Analytics

This chapter discusses several fundamental and managerial controversies associated with artificial intelligence and big data analytics which will be of interest to quantitative professionals and practitioners in the fields of computing, e-commerce, e-business services, and e-government. The authors utilized the systems thinking technique within an action research framework. They used this approach because their ideology was pragmatic, the problem at hand, was complex and institutional (healthcare discipline), and they needed to understand the problems from both a practitioner and a nonhuman technology process viewpoint. They used the literature review along with practitioner interviews collected at a big data conference. Although they found many problems, they considered these to be already encompassed into the big data five V's (volume, velocity, variety, value, veracity). Interestingly, they uncovered three new insights about the hidden healthcare artificial intelligence and big data analytics risks; then they proposed solutions for each of these problems.

Analysis of the Security of Modern Automated Technological Processes Control Systems: Attack on a SCADA Object

(……) Modern automated technology process control systems and the chances of attacks on them are examined in this article. It studies worm virus, Stuxnet, and its detection at the Bushehr Nuclear Power Plant. It also analyzes ways of carrying out attacks on critically important objects, and provides analytical tools for the security of technological process systems. The ways for discovering nodes compromised by the Stuxnet virus are proposed. The article considers technological network of typical topology and its typical vulnerabilities; it analyzes the Modbus protocol, the routing system, and passwords on Cisco routers.

Effect of Calcination Conditions on the Properties and Photoactivity of TiO2 Modified with Biuret

A simple wet impregnation-calcination method was used to obtain a series of novel non-metal doped TiO2 photocatalysts. Biuret was applied as C and N source, while raw titanium dioxide derived from sulfate technology process was used as TiO2 and S source. The influence of the modification with biuret and the effect of the atmosphere (air or argon) and temperature (500–800 °C) of calcination on the physicochemical properties and photocatalytic activity of the photocatalysts towards ketoprofen decomposition under simulated solar light was investigated. Moreover, selected photocatalysts were applied for ketoprofen photodecomposition under visible and UV irradiation. Crucial features affecting the photocatalytic activity were the anatase to rutile phase ratio, anatase crystallites size and non-metals content. The obtained photocatalysts revealed improved activity in the photocatalytic ketoprofen decomposition compared to the crude TiO2. The best photoactivity under all irradiation types exhibited the photocatalyst calcined in the air atmosphere at 600 °C, composed of 96.4% of anatase with 23 nm crystallites, and containing 0.11 wt% of C, 0.05 wt% of N and 0.77 wt% of S.

Dry Fibre Placement: The Influence of Process Parameters on Mechanical Laminate Properties and Infusion Behaviour

Within the dry fibre placement (DFP) process, spread and pre-bindered carbon fibre rovings are automatically processed into dry textile preforms using 2-D and 3-D laying systems. The aim was to automate existing hand lay-up processes, reducing the complexity, increasing robustness, and facilitating the handling of the DFP technology. Process reliability, low waste rates, and flexible production are demonstrated. In this publication, the influences of the process parameters, 2 mm wide gaps and the percentage of 90° plies in the laminate, are investigated with regard to the mechanical properties, the permeability, and the infusion times in the preform z-direction (thickness). The effects on stiffness and strength are compared for several use cases. An approach to determine the infusion times as a function of the laminate thickness, the ply structure, and 2 mm wide gaps is demonstrated and analysed using vacuum-assisted process (VAP) infusion tests. The investigations are performed with carbon fibre tows (24 k), a reactive epoxy-based binder system, and a thermoset infusion resin system.

A study to set-up a technological process for purification of Zinc scraps by using liquation method

Zinc scrap is a source of raw material for zinc oxide production. However, to qualify the requirement of raw material for zinc oxide (99.5%) production, refining this source is needed. Many methods are considered such as rectification, chemical method, etc., but difficult to apply on an industrial scale. This workfocused on the investigation of the influence of temperature and time factors for asessing the possibility of applying liquation method for the purification of impurities from scrap zinc.The experiment results show that the optimum temperature of liquation to remove Pb,Fe from zinc scrap is in the range of 440-450°C, the optimal time of the process is 8h for the pot with 8cm in height and 6cm in diameter (the quantity of raw zinc sample is about 2kg / batch), then we can obtain about 80% of zinc metal with an average Zn content of about 97, 0%, both Pb and Fe content decreased to a range from 0.35 to 0.4%, and 1.0 to 1.1%, respectively, which meet the requirement of raw materials for the production of high quanlity ZnO ( 99,5 %). Based on the parameters obtained on lab-scale, a trial on pilot scale of 250 kg / batch was conducted, The result confirms that the quality of the products meets the requirement of raw materials for production of high quality ZnO (99.5%) and a technology process for refining zinc scrap by the liquation was proposed.

Highly Accurate Digital Processing of Large Stroke Guideway with an Optical Material-Corning Code 7972

Currently, meter-long guideways rarely achieve an accuracy of dozens of nanometers due to processing difficulties such as the material and the edge effect. In this paper, we focus on this problem and propose a set of optimization processing methods to cope with it. In the grinding stage, a grinding tool is designed to improve the reciprocating processing and address the problem of warping; in the polishing stage, three different processes are compared, and the combination of magnetorheological finishing technology and the polyurethane disc technology process is purposed to reduce the polishing cycle and improve the surface figure accuracy. Moreover, through the combined process of magnetorheological finishing and smoothing, the edge effect and medium- and high-frequency error are essentially suppressed. The meter-long guideway is achieved with an accuracy of dozens of nanometers. Although the sizes of surface A/C and B/D are 1000 mm × 240 mm and 1000 mm × 160 mm, the surface figures are 20.33 nm, 22.78 nm, 39.23 nm and 26.58 nm RMS (Root Mean Square), respectively. The nanometer accuracy guideway is critical to an ultra-precision machine tool. Finally, the X-axis straightness of the profile measurement system formed by the guideway reaches 200 nm/600 mm.