we report on the synthesis, morphology, chemically and structurally of la2o3-co3o4-zro2 nanostructure. the la2o3-co3o4-zro2 nanostructure was synthesized by a method based on the co-precipitation. composite powders have been characterized by xrd (x-ray diffraction), sem (scanning electron microscopy) and bet (brunauer-emmett-teller). x-ray diffraction showed the formation of nano crystalline, l...

ethical misconduct is not a new issue in the history of science and literature. however, ethical misconducts in science have grown considerably in the modern era which is due to emphasis on the scientific proliferation in research institutes and gauging scientists according to their publications. in the current case series, several misconducts occurring over the previous years in mashhad univer...

Since the early 1990s, organizations have focused on making smarter decisions in their integrated supply chain central planning, but the representation of capacity and cycle time has remained static and linear in contrast to its complex nature. This includes central planning for firms with semiconductor fabrication facilities (FABS) as a component of a complex demand supply network(DSN) where m...

a simple method for fabrication of highly ordered gold nanorod film is introduced in this article. the procedure is based on thermal evaporation of gold into a porous anodic alumina film (paa). the ppa film was fabricated by combining the hard and mild anodization. this combination effectively decreases the processing time of fabrication of highly ordered porous anodic alumina film with control...

Due-date performance is one of the most important production indexes for success utilized by wafer fabrication factories. Traditionally, the industry sets a specific due-date tightness level and a dispatching rule based on the total processing time, the production capacity, pre-defined order release criteria and historical data, to ensure deliveries are made on-time. However, such policies typi...

With today’s keen competition, semiconductor market has changed from producer-oriented to customer-oriented. To be successful, companies need to consider both customer satisfaction in demand and the ultimate profit goal of companies. Semiconductor fabricators today must face an environment with multi-product types and multi-priority orders. Since semiconductor fabrication has a very complicated...

In the process of decision-making, sometimes analysts are given a sub-set of criteria for which statistical data are available from experiments, whereas for some other criteria, only qualitative judgments can be made. In such situations, it is important to consider the weights of experimental criteria along with the decision maker’s qualitative weights. Furthermore, in complex decision scenario...

We are studying the manufacturing performance of semiconductor wafer fabrication plants in the US, Asia, and Europe. There are great similarities in production equipment, manufacturing processes, and products produced at these plants. Nevertheless, data reported here show that important quantitative measures of productivity vary by factors of 3 to as much as 5 across an international sample of ...

In numerous wafer fabrication facilities (wafer fabs) the load changes dynamically. Current load release control schemes are usually developed and tested in a constant load environment. In this paper, we discuss four CONWIP-like lot release policies and assess their ability to buffer variability generated by the load changes and to keep the lot release variability as low as possible. All contro...

The authors discuss the concept and design criteria for a framework that facilitates the performance assessment of shop-floor control systems. Their basic concept includes a simulation model that emulates the shop floor of a wafer fab, sends information to the control system, and receives information back from the control system. The shop-floor control system is realized as a separate module th...