Anisotropic nanocrystal shape and ligand design for co-assembly

The use of nanocrystal (NC) building blocks to create metamaterials is a powerful approach to access emergent materials. Given the immense library of materials choices, progress in this area for anisotropic NCs is limited by the lack of co-assembly design principles. Here, we use a rational design approach to guide the co-assembly of two such anisotropic systems. We modulate the removal of geometrical incompatibilities between NCs by tuning the ligand shell, taking advantage of the lock-and-key motifs between emergent shapes of the ligand coating to subvert phase separation. Using a combination of theory, simulation, and experiments, we use our strategy to achieve co-assembly of a binary system of cubes and triangular plates and a secondary system involving two two-dimensional (2D) nanoplates. This theory-guided approach to NC assembly has the potential to direct materials choices for targeted binary co-assembly.

Backside Chippings Improvement through Wafer Dicing Parameter Optimization and Understanding the Anistropic Silicon Properties

Semiconductor Companies and Industries soar high as the trend for electronic gadgets and devices increases. Transition from “manual” to “fully automatic” application is one of the advantages why consumer adapt to changes and prefer electronic devices as one of daily answers. Individuals who admire these electronic devices often ask how they are made. As we look inside each device, we can notice interconnected microchips commonly called IC (Integrated Circuit). These are specially prepared silicon wafers where integrated circuit are developed. Commonly, each device is composed of numerous microchips depending on the design and functionality IC production is processed from “front-end” to “back-end” assembly. Front-end assembly includes wafer fabrication where electrical circuitry is prepared and integrated to every single silicon wafers. Back-end assembly covers processing the wafer by cutting into smaller individual and independent components called “dice”. Each dice will be placed into Leadframe, bonded with wires prior encapsulating with mold compounds. After molding, each IC will be cut through a process called singulation. Afterwards, all molded units are subjected for functional testing. Dice is central to each IC; it is where miniature transistor, resistor and capacitor are integrated to form complex small circuitry in microchips. Pre-assembly (Pre-assy) stations have the first hand prior to all succeeding stations. Live wafers are primary direct materials processed in these stations. Robust work instruction and parameter must be practiced during handling and processing to avoid gross rejection and possible work-related defects. The paper is all about the challenges to resolve and improved the backside chippings in 280um wafer thickness in mechanical dicing saw. The conventional Mechanical dicing process induce a lot of mechanical stress and vibration during the cutting process which oftentimes lead to backside chipping and die crack issues. However, backside chippings can mitigate with proper selection of parameter settings and understand the silicon wafer properties.

Association of Age and Gender distribution in Patients undergoing Onlay Restoration

In order to reinforce a weakened cusp, a restoration covering the cusp is done to reduce the incidence for fracture and the failure of the tooth. There are multiple options to perform posterior restorations, which include direct materials like amalgam and composite and indirect materials like ceramic and metal. The aim of the study was to find out the association of age, gender and tooth number in patients undergoing onlay restoration. 86000 patient records at a private dental college were reviewed between June 2019 to March 2020. Our study included all the people who had undergone onlay restoration. A total of 49 onlay restorations were done. The collected data was tabulated using Microsoft Excel and analyzed using SPSS. Incomplete data was excluded from the study. Statistical analysis was done using a chi-square test. In our study, we observed that the age group below 30 years (p>0.05) reported the most for onlay treatment with a higher incidence of males (p>0.05). A maximum number of onlay treated teeth was 46. (p>0.05) Metal ceramic was the most common type of material used for onlay fabrication. (p>0.05) Within the limitations of the study, no significant difference was found between age, gender, tooth number and type of material used for onlay fabrication.

Package Design Improvement for Wire Shorting Resolution

New devices and new technologies in semiconductor industry are getting more complex in terms of package layout, direct materials, and process capability. With the package design complexity, several issues are encountered during the development, and in turn affecting the overall yield of the package. The paper discusses the modification and improvement done on the bond/lead finger where the wire has issues on shorting with the soldermask during wirebonding process. With the design improvement, occurrence of wire shorting to soldermask would be mitigated.

Analysis Price List Update Process of Price List Management on Direct Material Procurement Department at PT. X

PT.X is one of the largest consumer goods manufacturing companies in Indonesia. As manufacturing companies PT. X has Direct Material (DIM) Procurement Department to control all direct material, which also controls the price list. The process of controlling price list update is still handled via email. The use of email as communication between internal PT. X and also with the vendor, cause email pilling up in the DIM Procurement staff’s inbox. This causes the process of updating material price list to become long and hard to control. There are approximately 4 500 direct materials and approximately 130 active vendors are handled by the DIM Procurement department annually. A large number of materials and vendor handled by DIM Procurement is one of the reasons why the process of controlling price list is important. Digitalization is one way to help the process of controlling and simplifying the price list update process. Improvements to the process of price list update will be done by designing the concept of a platform that helps improve the performance of DIM Procurement Department. The platform called price list catalog can be used to store and record all vendor price list changes. The suggestions for price list update process is to facilitate DIM Procurement department so they can easily control material price list, provide trusted price list, and always available on time. Keywords: price list catalog; price list control; price list data; pricing management

DEVIATION ANALYSIS AS A CONTROL METHOD

The article focuses on the management approach in the assessment and analysis of deviations in operating enterprises and technically explains the methodology for calculating deviations. The types of cost deviations and their monitoring in enterprises are determined, as a deviation of the costs for direct materials, a deviation of the costs for direct labor, etc. Attention is given to the main reasons for cost deviations such as the cost of materials, downtime, labor efficiency and more. PURPOSE: The aim of the article is to identify and analyze existing technical and methodological approaches for calculating deviations. METHODS: Тhe systemic and structural approach, the analysis and the synthesis, including the study of literature sources. RESULTS: The contributions are about choosing the right tools for determining and assessing deviations and the reasons for them in the analysis with specific digital information. CONCLUSION: It is found that controlling as part of cost management and analysis of variances helps to identify specific measures and eliminate errors through them.

Limitaciones de los proveedores mexicanos de la electrónica frente a los extranjeros

ResumenEste trabajo analiza las diferencias entre proveedores extranjeros y mexicanos en la industria electrónica en Baja California. Por un lado, se encuentran los proveedores mexicanos con limitaciones tecnológicas, productivas y en el tamaño del empleo. Se especializan en la fabricación de insumos y materiales indirectos, lo que les impide insertarse en las cadenas productivas de dicha industria, en particular con las firmas transnacionales. Además, se trata de tradicionales negocios familiares. Por otro lado, se encuentran los proveedores extranjeros cuya especialización es la producción de materiales directos para la industria electrónica. Su vinculación es de largo plazo con las transnacionales, lo cual les ha permitido adquirir una mayor transferencia tecnológica, asistencia técnica, personal calificado y capacitado, garantizando con ello su posición competitiva en cuanto a brindar calidad, precio y entrega a tiempo.Palabras clave: maquiladoras, proveedores locales, tecnología, competitividad, empresas trasnacionales. AbstractThis article compared two types of suppliers in the electronic industry in Baja California: domestic and foreign. On the one hand, the Mexican supplier has important limitations: technological, productive and employment size. Also, the production of indirect materials and components, plus traditional organization base on familiar linkages produced important obstacles. Those characteristics limited the integration of Mexican suppliers in the commodity chain of the electronic industry and especially with transnational firms. On the other hand, the foreign suppliers are specialized in direct materials (tier two), based on longterm relationships with transnational firms. This allows them to obtain technological and technical capabilities, more skill people and more training, all of which guarantee their competitiveness on quality, cost and just in time delivery.Key words: local suppliers, transnational firms, technology, competitiveness, maquiladoras.

Assembly FG: An Education Case Study Using QuickBooks as the AIS for a Small Manufacturing Business

ABSTRACT This education case is the first to use QuickBooks Premier Accountant to teach students foundation functionalities common to all Enterprise Resource Planning (ERP) systems that support discrete manufacturing. Students learn how to configure QuickBooks so that direct materials, direct labor and applied manufacturing overhead costs charged to work-in-process parts manufactured at lower levels of the BOM are rolled up into the costs of higher-level work-in-process parts and, ultimately, into the costs of the finished goods parts. Students set up raw materials, work-in-process and finished goods part numbers so that quantities and costs of parts on-hand are tracked in inventory on the Perpetual Inventory System to provide an inventory subsidiary ledger that continuously matches the manufacturing inventory account balances in the Chart of Accounts. Students learn the importance of configuring Off the Shelf (OTS) manufacturing systems in accurately costing manufactured discrete products, including setting up manufacturing accounts, employees, part numbers, and the BOM. As such, the case is designed to be used in Accounting Information Systems (AIS) courses that are already using QuickBooks to help students' better understand the general concepts covered in AIS textbooks on the Production Cycle that are not addressed in extant textbooks on QuickBooks.

ANALISIS PERHITUNGAN HARGA POKOK PRODUKSI PRODUK SPRING BED PADA PT. MASSINDO SINAR PRATAMA

Determination of the cost of production is an important problem in a manufacturing company where the activity is to process the raw materials into finished materials subsequently sold to consumers for a profit. Cost of production is the cost of production which has applied to all finished products are being manufactured during a certain period. This study aims to determine the calculation of the cost of production at PT. Massindo Sinar Pratama. Analyses were performed using the descriptive method in qualitative to be a method to collect data, compiled, interpreted, and analyzed so as to provide an overview of the state of the subject and the object under study is based on facts. From these results it can be seen in the production process of spring, charging based on the type and size of production resulting in a period of one month. With the charge of direct materials, direct labor costs and factory overhead costs. Direct materials used include; Foam, Cloth spring, Spriral iron, wood, and plastic legs. The imposition of direct labor costs based on rates of production units produced. Imposition of factory overhead costs to products based on the overhead costs are determined upfront.