well control Articles
-
Effect of a separate heater structure for crystallisation to enable multilevel storage phase–change memory
The effect of a separate–heater structure for crystallisation to enable multilevel storage for phase–change memory (PCM) device was investigated. This separate–heater is characterised by a constant resistant Rh. Existing power from the heater layer (TiSi3) can be well controlled, enabling crystallisation process for multilevel storage. Ge2Sb2Te5 (GST) was used as the memory layer. A simulation ...
-
Managing Bullwhip-induced risks in supply chains
We discuss the exploitation of a well-established replenishment rule, the order-up-to policy, to control the supply chain risk resulting from the Bullwhip effect. To avoid this risk within supply chains, two specific recommendations are highly important. First, we provide strong evidence that availability of high fidelity up-to-date delivery lead-time information is essential. This inevitably ...
-
BowtieXP
WHAT IS A BOW‐TIE?A BowTie is a diagram that visualises the risks you are dealing with. The diagram is shaped like a bow‐tie, creating a clear differentiation between proactive and reactive risk management. The power of a BowTieXP diagram is that it shows you how well you are controlling plausible risk scenarios, in one easy to understand picture. In short, it provides a simple, ...
-
2. How are turnstiles used to control the flow of people in and out of a theme park?
Turnstiles are a physical barrier used to control the flow of people in and out of a theme park. They are typically located at the entrance and exit of a park, and can be used to both control the number of people entering the park and to collect data on who is entering and exiting. Turnstiles can be used to collect data on park attendance, as well as to control the flow of people in and out of a ...
-
Nonlinear phenomena in DC–DC buck converter by means of iteration mapping technique
In this paper, the nonlinear phenomenon in DC/DC buck converter is studied. A practical design for a DC/DC buck converter was considered in this study, which results in a more comprehensive understanding for the phenomenon. The nonlinearity of the buck converter is studied using the iteration mapping technique. The results showed that if the system has a well–designed buck converter as well as a ...
-
Study on the wellbore flow and phase transition during formation H 2 S invasion
Considering the special physical properties of hydrogen sulphide (H 2 S) and its phase transition in the wellbore, a mathematical model for wellbore flow and heat transfer during formation H 2 S invasion was established. Heat transfer and pressure were calculated along with H 2 S physical properties parameters, and a solution method of the model was proposed. The results indicate that ...
-
Titanium Machining With High Efficiency
Titanium alloy is a high strength metal with heavy viscosity, it's easy to generate and gather heat on cutting section during cutting. What's worse, there is a risk to cause fire when milling for a long time because of titanium's poor thermal conductivity. Since high speed cutting is not good for machining titanium alloy materials, it's a difficult problem for many companies engaged in producing ...
-
A Servo System for Hollow Cylinder Testing of Soils
A fully digitized servo-control system, coupled with the automatic data acquisition facility, has been developed for a hollow cylinder apparatus (HCA). The closed-loop servo-control is based on a computer through which four individual stresses acting on the hollow cylindrical specimen can be independently changed using pneumatic regulators driven by stepper motors. The range of tests that can be ...
-
Physicists have found new quantum effects in bilayer graphene
Theorists at the University of Texas at Dallas and colleagues in Germany have for the first time observed a rare phenomenon in a very simple material, called the quantum anomalous Hall effect. Previous experiments have only found it in complex or subtle substances. Fan Zhang, associate professor in the School of Physics, Natural Sciences and Mathematics, is the author of this study published in ...
By Matexcel
-
State–of–the–art review of FRP composites for major construction with high performance and longevity
This paper first identifies the need for high performance and longevity of major engineering structures focusing on the problems in current civil infrastructure. Subsequently, it reviews the state–of–the–art research of FRP in structural retrofitting and strengthening and identifies the challenges facing further development of FRP in civil engineering. In order to address the above background, ...
-
Molecular engineering of biomolecules for nanobio-sciences
Biologically programmed molecular recognition provides the basis of all natural systems and supplies evolution optimised functional materials from self-assembly of a limited number of molecular building blocks. Biomolecules such as peptides, nucleic acids and carbohydrates represent a diverse supply of structural building blocks for the chemist to design and fabricate new functional ...
-
Comparative analysis of LQR and robust controller for active suspension
This paper aims to investigate the performance of linear quadractic regulator (LQR), robust H∞ and passive controller for active suspension of the quarter car model. The presented approach is based on linear model well supported by computer–aided control systems design (CACSD) tool which yields faster control design approach. The linear active suspension provides better handling and ride comfort ...
-
Chronic toxicity of selected polycyclic aromatic hydrocarbons to algae and crustaceans using passive dosing
Due to the large number of possible aromatic hydrocarbon structures, predictive toxicity models are needed to support substance hazard and risk assessments. Calibration and evaluation of such models requires toxicity data with well‐defined exposures. The present study has applied a passive dosing (PD) method to generate reliable chronic effects data for eight polycyclic aromatic hydrocarbons ...
-
Best Known Method for Clean Fluid Sampling to Get Consistent Measurements During Offline Particle Analysis
Abstract A complete chemical quality monitoring program includes data gathered from the time chemicals are received all the way to the point of process. Throughout this monitoring program, the best known method (BKM) which provides optimal data quality and time resolution is continuous in-line monitoring. However, physical and environmental challenges posed by some chemicals and how they are ...
-
River safe yield with the constraint of a contracted rectangular weir for surface water supply
Aydin et al. introduced the weir velocity concept in 2011 for discharge measurement in contracted rectangular sharp-crested weirs. Gharahjeh et al. further reinforced this formula in 2015 to allow discharge to be computed using only weir velocity and crest width. These newly introduced expressions are tested and demonstrated to determine surface water yield of Tapah River in Sarawak. Aydin ...
-
A New Combined Servo-Controlled Loading Frame/Direct-Shear Apparatus for the Study of Concrete or Rock Joint Behavior Under Different Boundary and Loading Conditions
A new combined servo-controlled loading frame/direct-shear apparatus has recently been developed at the Civil Engineering Department of Université de Sherbrooke. This direct-shear device is capable of shear testing of rock joints under constant normal stiffness or constant normal load boundary conditions. Due to its combination with a servo-controlled loading frame, it allows load as well as ...
-
Controlling stability and electronic properties of small–diameter SiC nanowires by fluorination
We report results of a density functional theory study of the electronic properties and stability of fluorine–saturated 0.355nm–thick silicon carbide nanowires with a 3C–SiC core and grown along the [111] direction. The electronic band gaps of the fully fluorinated SiC nanowires are lower than that of the corresponding fully hydrogenated ones by up to 1.09 eV. Moreover, the structural stability ...
-
QYSEA FIFISH P3 Underwater Robot
There are 12 men that have walked on the moon. 500 human beings have been to space. But only 3 dived into Challenger Deep, the deepest point under the sea. Yet the sea covers 70% of the earth. Let’s discover the unknown with underwater search camera P3. Go Anywhere You Wish. Capture Every Epic Adventure. Fast & stable shooting could be easily achieved since FIFISH P3 has combined ...
-
Long-term evaluation of a spectral sensor for nitrite and nitrate
Abstract: A spectral in-situ UV sensor was investigated to measure nitrite and nitrate concentrations in the effluent of the EAWAG pilot-scale plant. The sensor was used with a calibration that was based on data from another WWTP and was operated over a period of 1.5 years. The results showed constant accuracy although the sensor was operated with minimal maintenance (manual cleaning once a ...
-
Model-Supported Design, Testing, and Implementation of Process Control Strategies. in: Smart Water Utilities: Complexity Made Simple
Abstract: Advanced process control has the ability to allow the full performance potential of your wastewater treatment plant to be realized by taking advantage of existing but unused capacities. In plants that are nearing their capacity limits this can lead to improved effluent quality and process stability. In plants that are under capacity, advanced control can allow you to operate your plant ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you