Batching to minimize total production time for two part types

1997 ◽  
Vol 48 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Chung Yaw Ching ◽  
Ching-Jong Liao ◽  
Chutao John Wu
Keyword(s):  
Total Production ◽  
Production Time

Optimized High-Aspect-Ratio Diffusional Micromixers

2008 ◽  
Author(s):  
Amit Maha ◽  
Vamsidhar Palaparthy ◽  
Steven A. Soper ◽  
Michael C. Murphy ◽  
Dimitris E. Nikitopoulos
Keyword(s):  
Pressure Drop ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Optimization Procedure ◽  
Main Stream ◽  
Total Production ◽  
Production Time ◽  
Operating Condition ◽  
Micro Channels ◽  
Mixture Volume

This part of our work has been aimed at designing, manufacturing and characterizing effective micro-mixers which are cheap, durable and easily integrated on a variety of bio-chips with emphasis on those performing Polymerese Chain Reactions (PCR) and Ligase Detection Reactions (LDR). A key contribution is the development of an optimization procedure for the design of passive micro-mixers utilizing high-aspect-ratio micro-channels (HARMC). The optimization procedure identifies the optimum type of mixer on the basis of the flow rate proportions of the mixture constituents and provides for two optimum designs of the selected mixer type for an aspect ratio of choice in two ways: (a) for specified mixture volume and mixer pressure drop the optimum mixer dimensions and operating condition minimize the total production time and (b) for specified mixture volume and a total production time the optimum mixer dimensions and operating condition minimize the mixer pressure drop. The simplest and easiest to manufacture layout of an optimized mixer configuration (X2JC) with two inlet ports and three layers is shown in Figure 1. The injection of compound 1 into the compound 2 main stream is performed through two side-jets in a wider channel to further reduce the pressure loss overhead followed by a contraction into the main mixing channel.

scholarly journals Skeleton Based Perpendicularly Scanning - A New Scanning Strategy for Additive Manufacturing: Modeling and Optimization

2020 ◽  
Author(s):  
Mostapha El Jai ◽  
Iatimad AKHRIF ◽  
Nourddin Saidou
Keyword(s):  
Additive Manufacturing ◽  
Central Area ◽  
Total Production ◽  
Scanning Strategy ◽  
Production Time ◽  
Surface Unit ◽  
First Case ◽  
Decision Variables ◽  
Novel Strategy ◽  
Space Distance

Abstract In this paper, the authors propose a novel strategy of 2D scanning that might be adapted for any additive manufacturing process. The featured novelty corresponds to a Skeleton Based Perpendicularly (SBP) of the 2D shape of each slice. Thus, it is proposed to minimize the total production time of a given layer under some constraints. In other word, it is proposed to study the competitiveness conditions of the new scanning technique regarding the classical chess scanning strategy from a productivity perspective. In order to introduce this new technique, the paper treats the case of a rectangular layer. The competitiveness of the proposed technique was discussed according to chess decomposition parameters, the hatch space distance, and the dimensions of the primitive rectangle layer to analyze. The indicators introduced corresponds to “the gain of production time” and “the specific gain of production time per surface unit”; then, these latter were computed and discussed in two separated cases of study. The findings show that, by the adoption of the SBP technique instead the chess scanning strategy, it is possible to save about 3% to 45% of production time gain for the first case of study. The gain of production time per surface unit was analyzed in the second case of study. The correspondent analysis permitted to highlight the percentage of gain of time related to the area to scan. Indeed, the gain per surface unit varies between 4.32×10-6%/mm2 and 6.96×10-05%/mm2. In one hand, these indicators depend linearly on the decomposition strategy of the central area of the SBP technique and also according to the rectangle dimensions. In addition, for the lowest values of hatch space, around 25µm, the two techniques in competition present quasi-similar production time, where the variations between them is minimal. Nevertheless, starting from 65µm, the SBP scanning strategy present considerable less time of production judged as exponentially decreasing according to the hatch space distance. Finally, one can see that the scanning model proposed could present major contributions in other scientific and technical fields that use surface control as territorial security, water adduction and distribution, telecommunication, etc. by varying and adapting the decision variables according to each field of study.

scholarly journals Effects of Chlormequat Chloride Rate on Growth and Development of Several Aster Cultivars

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 846B-846
Author(s):  
Serge Gagnon ◽  
Blanche Dansereau
Keyword(s):  
Growth Regulators ◽  
Growth Regulator ◽  
Growth And Development ◽  
Total Production ◽  
Production Time ◽  
Chlormequat Chloride ◽  
Reduced Height ◽  
Rate Effects

Our purpose was to determine growth regulators rate effects on growth and development of aster Callistephus chinensis. During Spring 1993 and 1994, six aster cultivars were sown into 200-unit plug trays containing Pro-Mix PGX. Seedlings were transplanted into 10-cm pots containing Pro-Mix. Two weeks after transplanting, seedlings were sprayed with chlormequat chloride (CCC) at 750 or 1500 ppm and were compared to nontreated plants. A second application was applied 2 weeks later. Growth and development of asters were affected differently depending on cultivars and experimental season. During Spring 1994, a CCC treatment of 750 and 1500 ppm significantly reduced height and width of Dwarf Carpet Mix and Dwarf Spider Mix without affecting the number of flowers and total production time compared to nontreated plants. Growth regulator treatments had no effect on height and width of `Milady Mix' and `Starlight Rose'. However, the 750 ppm CCC treatment reduced the number of flowers produced by these two cultivars. Results obtained in 1993 also are presented.

scholarly journals Photoperiod, Irradiance, and Temperature Affect Echinopsis ‘Rose Quartz’ Flowering

HortScience ◽  
2016 ◽  
Vol 51 (12) ◽  
pp. 1494-1497
Author(s):  
John Erwin ◽  
Rene O’Connell ◽  
Ken Altman
Keyword(s):  
Flower Development ◽  
Flowering Plants ◽  
Cool Temperature ◽  
Total Production ◽  
Spray Application ◽  
Night Temperature ◽  
Flower Number ◽  
Production Time ◽  
Supplemental Lighting ◽  
Short Days

Photoperiod, irradiance, cool temperature (5 °C), and benzyladenine (BA) application effects on Echinopsis ‘Rose Quartz’ flowering were examined. Plants were placed in a 5 °C greenhouse under natural daylight (DL) for 0, 4, 8, or 12 weeks, then moved to a 22/18 °C (day/night temperature) greenhouse under short days (SD, 8-hour DL) plus 0, 25, 45, or 75 μmol·m−2·s−1 supplemental lighting (0800–1600 hr; 8-hour photoperiod), long days (LD) delivered with DL plus night-interruption lighting (NI) (2200–0200 hr), or DL plus 25, 45, or 75 μmol·m−2·s−1 supplemental lighting (0800–0200 hr) for 6 weeks. Plants were then grown under DL only. Percent flowering plants increased as irradiance increased from 0–25 to +75 μmol·m−2·s−1 on uncooled plants, from 0% to 100% as 5 °C exposure increased from 0 to 8 weeks under subsequent SD and from 25% to 100% as 5 °C exposure increased from 0 to 4 weeks under subsequent LD. As 5 °C exposure duration increased from 0 to 12 weeks (SD-grown) and from 0 to 8 weeks (LD-grown), flower number increased from 0 to 11 and from 5 to 21 flowers per plant across irradiance treatments, respectively. Total production time ranged from 123 to 147 days on plants cooled from 8 to 12 weeks (SD-grown) and from 52 to 94 days on plants cooled for 0–4 weeks to 119–153 days on plants cooled for 8–12 weeks (LD-grown). Flower life varied from 1 to 3 days. BA spray application (10–40 mg·L−1) once or twice after a 12-week 5 °C exposure reduced flower number. Flower development was not photoperiodic. High flower number (17–21 flowers/plant) and short production time (including cooling time, 120–122 days) occurred when plants were grown at 5 °C for 8 weeks, then grown under LD + 45–75 μmol·m−2·s−1 for 6 weeks (16 hours; 10.9–12.8 mol·m−2·d−1) at a 22/18 °C day/night temperature. Taken together, Echinopsis ‘Rose Quartz’ exhibited a facultative cool temperature and facultative LD requirement for flowering.

Ultrasonic welding for fast bonding of self-aligned structures in lab-on-a-chip systems

Lab on a Chip ◽  
2015 ◽  
Vol 15 (9) ◽  
pp. 1998-2001 ◽  
Author(s):  
K. Kistrup ◽  
C. E. Poulsen ◽  
M. F. Hansen ◽  
A. Wolff
Keyword(s):  
Injection Moulding ◽  
Lab On A Chip ◽  
Ultrasonic Welding ◽  
Total Production ◽  
Large Area ◽  
Production Time

We demonstrate ultrasonic welding for (1) self-aligned gapless bonding of a two-part lab-on-a-chip system and for (2) bonding of a large area shallow chamber. Combining injection moulding using micromilled shims with ultrasonic welding, we can go from design to a batch of chips within a single day. The chips are mass-producible with a total production time of 60 s per chip.

scholarly journals 565 Use of Cooperative Learning Exercizes to Introduce Concepts in Potted Plant Production Classes

HortScience ◽  
2000 ◽  
Vol 35 (3) ◽  
pp. 493C-493
Author(s):  
Neil O. Anderson
Keyword(s):  
Cooperative Learning ◽  
Market Share ◽  
Role Playing ◽  
Plant Production ◽  
Limiting Factors ◽  
Class Discussion ◽  
Total Production ◽  
Labor Input ◽  
Production Time ◽  
Potted Plant

In production classes, students often commence the class by learning complicated crop-specific production cycles. Rarely are they afforded the opportunity of spending several class periods to first understand the major differences between commercial crops for production time, labor input, and market share. A cooperative learning exercise was created for the first week of lectures in potted plant production class (Hort 4051) at the Univ. of Minnesota (n = 18 students). Students were assigned to working groups for discussion and synthesis of the assignment. One week later, each group turned in their recommendations and one lecture session was devoted to in-class discussion of their answers. The exercise was in the form of a memo from a commercial company, Floratech, addressed to the students as the newly hired potted plant production specialists. In the memo, a graphical summary was presented of 13 major and minor potted crops, contrasting total production time, labor input, and market share for each crop. As production specialists, the student's primary task was to interact with all staff (other students role-playing various positions within the company) to answer the following question: “What is the most realistic, cost-effective location on the graph that Floratech should aim to move all crops?” Group discussions, both within and outside of class, focused on the noticeable trends depicted by the graph and the limiting factors that prevented crops from moving to the ideal location. Growers and breeders were quizzed on what factors kept each crop in the specific locations on the graph. The majority of student chose the midpoint of the graph as the best location. The exercise successfully peaked student's awareness of crop differences and the limiting production factors. Throughout the semester, students referred back to this graph to pinpoint the location for each crop covered.

scholarly journals CONSIDERING TIME IN ORTHOPHOTOGRAPHY PRODUCTION: FROM A GENERAL WORKFLOW TO A SHORTENED WORKFLOW FOR A FASTER DISASTER RESPONSE

2015 ◽  
Vol XL-3/W3 ◽  
pp. 249-255
Author(s):  
G. Lucas
Keyword(s):  
Data Acquisition ◽  
Time Allocation ◽  
Feature Detection ◽  
Medium Size ◽  
Positional Error ◽  
Total Production ◽  
Post Processing ◽  
Positional Accuracy ◽  
Production Time ◽  
Digital Frame

This article overall deals with production time with orthophoto imagery with medium size digital frame camera. The workflow examination follows two main parts: data acquisition and post-processing. The objectives of the research are fourfold: 1/ gathering time references for the most important steps of orthophoto production (it turned out that literature is missing on this topic); these figures are used later for total production time estimation; 2/ identifying levers for reducing orthophoto production time; 3/ building a simplified production workflow for emergency response: less exigent with accuracy and faster; and compare it to a classical workflow; 4/ providing methodical elements for the estimation of production time with a custom project. <br><br> In the data acquisition part a comprehensive review lists and describes all the factors that may affect the acquisition efficiency. Using a simulation with different variables (average line length, time of the turns, flight speed) their effect on acquisition efficiency is quantitatively examined. <br><br> Regarding post-processing, the time references figures were collected from the processing of a 1000 frames case study with 15 cm GSD covering a rectangular area of 447 km<sup>2</sup>; the time required to achieve each step during the production is written down. When several technical options are possible, each one is tested and time documented so as all alternatives are available. Based on a technical choice with the workflow and using the compiled time reference of the elementary steps, a total time is calculated for the post-processing of the 1000 frames. Two scenarios are compared as regards to time and accuracy. The first one follows the “normal” practices, comprising triangulation, orthorectification and advanced mosaicking methods (feature detection, seam line editing and seam applicator); the second is simplified and make compromise over positional accuracy (using direct geo-referencing) and seamlines preparation in order to achieve orthophoto production faster. The shortened workflow reduces the production time by more than three whereas the positional error increases from 1 GSD to 1.5 GSD. The examination of time allocation through the production process shows that it is worth sparing time in the post-processing phase.

scholarly journals Application of the modified ant colony algorithm for solving the problem of scheduling of distributed enterprises

2021 ◽  
Vol 1 (1) ◽  
pp. 29-42
Author(s):  
Danil D. Bukhovtsev
Keyword(s):  
Ant Colony Algorithm ◽  
Ant Colony ◽  
Ant Colony System ◽  
Total Production ◽  
Scheduling Problem ◽  
Work Schedule ◽  
Production Time ◽  
Distributed Enterprises

The task of scheduling of distributed enterprises is to assign tasks to geographically remote enterprises and to determine a convenient work schedule for each of the enterprises. The goal of solving this problem is to minimize the total production time at all enterprises. This article is the first step towards solving the scheduling problem using different versions of the ant colony algorithm: the classic ant colony algorithm, the ant colony system algorithm, and the modified ant colony algorithm.

An Algorithm for Economic Lot Scheduling Problem

2014 ◽  
Vol 945-949 ◽  
pp. 3097-3101
Author(s):  
Rong Wu Luo ◽  
Ru He Xie ◽  
Long Wen Xiao ◽  
Yi Feng Zou
Keyword(s):  
Total Production ◽  
Scheduling Problem ◽  
Daily Cost ◽  
Production Time ◽  
Lot Scheduling ◽  
Basic Period ◽  
Economic Lot Scheduling Problem ◽  
Economic Lot Scheduling ◽  
Very High

The Economic Lot Scheduling Problem (ELSP) has been well-researched for over half a century. This paper, by using extended basic period approach, offers a new algorithm which differs from previous algorithms in that every item is of different importance. Such an item, whose daily cost is very high, is considered to be of greater importance and is called “key item”; and such an item, whose total production time per times is long, is considered to be of greater importance and is called “obstacle item”. By making key items’ multipliers to be of good compatibility and loading obstacle items preferentially, new algorithm can offer good solution.

Sign in / Sign up

Export Citation Format

Share Document