Pembentukan Diafragma Beralun Silikon Dengan Menggunakan Teknik Punaran Anisotropik

2012 ◽  
Author(s):  
Norhayati Soin ◽  
Burhanuddin Yeop Majlis
Keyword(s):  
Key Words ◽  
Experimental Studies ◽  
Anisotropic Etching ◽  
Etching Technique ◽  
Convex Corner ◽  
Mask Design ◽  
Etching Mask ◽  
Corrugated Diaphragm

Kertas ini memaparkan kajian mengenai pembentukan diafragma beralun silikon dengan menggunakan teknik punaran anisotropik di mana larutan kalium hidroksida digunakan sebagai larutan pemunar. Kajian ini meliputi pengoptimuman topeng punaran bagi mengatasi masalah keadaan potong bawah penjuru yang berlaku pada struktur berpenjuru cembung diafragma beralun yang terpunar. Hasil yang diperolehi daripada kajian simulasi dan eksperimen membuktikan bahawa pengoptimuman topeng punaran yang telah dilakukan berkemampuan mengatasi masalah potong bawah penjuru diafragma beralun silikon. Kata kunci: diafragma beralun, punaran anisotropik, pengoptimuman topeng This paper presents the study of the formation of a perfect silicon corrugated diaphragm using anisotropic etching technique. Potassim hydroxide (KOH) solution is used as the etching solvent in this study. This study includes optimization of the etching mask, in order to avoid the problem of corner undercutting which exists on all convex corner structures on the etched corrugated diaphragm. Results from the simulation and experimental studies have proved that the optimized etching mask design was able to overcome the problem of convex corner undercutting. Key words: corrugated diaphragm, anisotropic etching, mask optimization

Results of an experimental study of hydrogel drainage containing ranibizumab in antiglaucoma operations

2021 ◽  
pp. 63-67
Author(s):  
I.I. Khusnitdinov ◽  
Keyword(s):  
Experimental Study ◽  
Hyaluronic Acid ◽  
Key Words ◽  
Experimental Research ◽  
Experimental Studies ◽  
Glaucoma Surgery ◽  
Control Group ◽  
Morphological Studies

Purpose. Еxperimental substantiation of the effectiveness of biocompatible biodegradable hydrogels based on hyaluronic acid and chitosan succinate as a carrier of ranibizumab in antiglaucoma operations. Material and methods. Hydrogel drainage (HD) was obtained immediately before surgery. A solution of ranibizumab (0.23 ml) was mixed with a solution of hyaluronic acid dialdehyde (0.5 ml), then a solution of chitosan succinate (0.5 ml) was added. Experimental studies were performed in 12 (12 eyes) healthy rabbits. The first group consisted of 6 eyes – 0.187 ml of ranibizumab per 1 ml of gel. In the control group, HD was used intraoperatively without the addition of ranibizumab (6 eyes). Morphological studies were performed on 7th, 21st, and 42nd days. Results. In experimental studies in vitro and in vivo, it was proved that ranibizumab, administered as a part of 0.1 ml of hydrogel drainage in the antiglaucoma surgery area is released within 3 weeks and suppresses vascularization, scarring of the operating area, and preserves the intrascleral cavity. The optimal concentration of ranibizumab was selected-0.02 ml in 0.1 ml of gel. Conclusion. The safety and effectiveness of the use of hydrogel drainage with ranibizumab based on hyaluronic acid dialdehyde and chitosan succinate in anti-glaucoma operations has been proven. Key words: experimental research, hydrogel drainage, ranibizumab, glaucoma surgery.

Deaf and Hard-of-hearing Users Evaluating Designs for Highlighting Key Words in Educational Lecture Videos

2021 ◽  
Vol 14 (4) ◽  
pp. 1-24
Author(s):  
Sushant Kafle ◽  
Becca Dingman ◽  
Matt Huenerfauth
Keyword(s):  
Experimental Study ◽  
Key Words ◽  
Hard Of Hearing ◽  
Experimental Studies ◽  
Design Parameters ◽  
Educational Video ◽  
Word Level ◽  
Sentence Level ◽  
First Occurrence ◽  
Educational Videos

There are style guidelines for authors who highlight important words in static text, e.g., bolded words in student textbooks, yet little research has investigated highlighting in dynamic texts, e.g., captions during educational videos for Deaf or Hard of Hearing (DHH) users. In our experimental study, DHH participants subjectively compared design parameters for caption highlighting, including: decoration (underlining vs. italicizing vs. boldfacing), granularity (sentence level vs. word level), and whether to highlight only the first occurrence of a repeating keyword. In partial contrast to recommendations in prior research, which had not been based on experimental studies with DHH users, we found that DHH participants preferred boldface, word-level highlighting in captions. Our empirical results provide guidance for the design of keyword highlighting during captioned videos for DHH users, especially in educational video genres.

Calculation of the fire resistance of steel hollow structural section columns filled with plain concrete

1994 ◽  
Vol 21 (3) ◽  
pp. 382-385 ◽  
Author(s):  
T. T. Lie ◽  
D. C. Stringer
Keyword(s):  
Mathematical Models ◽  
Key Words ◽  
Fire Resistance ◽  
Experimental Studies ◽  
Plain Concrete ◽  
Building Codes ◽  
Aggregate Concrete ◽  
Parametric Studies ◽  
Hollow Structural Section ◽  
Hollow Structural Sections

Experimental studies were conducted to determine the fire resistance of circular and square hollow structural section columns filled with plain concrete. Mathematical models were developed and used to investigate the influence of important parameters that determine the fire resistance of these columns. The experimental and parametric studies provide information for the development of formulas for the calculation of the fire resistance of circular and square concentrically loaded columns filled with plain carbonate or siliceous aggregate concrete. Such formulas are suitable for incorporation into building codes. Key words: calculation, fire resistance, columns, concrete-filled, steel, hollow structural sections.

Influence of Etching Potential on Convex Corner Anisotropic Etching in TMAH Solution

2010 ◽  
Vol 19 (5) ◽  
pp. 1254-1259 ◽  
Author(s):  
Alvise Bagolini ◽  
Alessandro Faes ◽  
Massimiliano Decarli
Keyword(s):  
Anisotropic Etching ◽  
Convex Corner ◽  
Tmah Solution

Assessing the feasibility of using a carbon material in the design of a radiative cooler for spacecraft

2020 ◽  
pp. 42-47
Author(s):  
Aleksandr P. BELOGLAZOV ◽  
Andrey G. EREMIN ◽  
Sergey A. NEMYKIN ◽  
Aleksey Yu ZHURAVLEV
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Key Words ◽  
Heat Pipe ◽  
Carbon Material ◽  
Manufacturing Process ◽  
Experimental Studies ◽  
Feasibility Studies ◽  
Braze Joint ◽  
Design And Manufacturing

The paper discusses the results of feasibility studies for using a carbon web as the radiating surface of a spacecraft radiative cooler. It proposes a design and manufacturing process solution that provides for a link between heat-transfer devices and the carbon web that has the necessary strength and minimizes heat loss. It presents results of experimental studies of temperature distribution across the radiative surface of the carbon web with mockups of the heat transfer devices. An analysis of the obtained results showed that the use of a carbon web in the design of a spacecraft radiative cooler is both feasible and promising. Key words: spacecraft, heat-conductive carbon web, radiative cooler, heat pipe, braze joint, heater.

Les évacuateurs de crues en labyrinthe : dimensionnement, fonctionnement, exemples et particularités

1995 ◽  
Vol 22 (5) ◽  
pp. 916-924 ◽  
Author(s):  
Nacer Eddine Zerrouk ◽  
Claude Marche
Keyword(s):  
Key Words ◽  
Flood Control ◽  
Experimental Studies ◽  
Flood Routing ◽  
Design Flood ◽  
Labyrinth Weir ◽  
Right Of Way ◽  
Attractive Option ◽  
Flow Diagrams ◽  
Calculation Procedures

The purpose of this paper is to demonstrate that labyrinth spillways can be a better option than rectilinear ones. The stages that have led to development of the labyrinth spillway are briefly reviewed as are applicable design and calculation principles. Discharge flow diagrams given by Hay and Taylor, Darvas, Lux and Hinchliff, and Magalhaes and Lorena for a trapezoidal labyrinth weir are compared. Calculation procedures and design diagrams were automated, making it possible to study flood routing through a labyrinth spillway and compare its performance to that of an equivalent rectilinear spillway. A real case was used for validation: routing through the trapezoidal labyrinth weir selected for the Keddara Dam in Algeria was compared with routing through the rectilinear spillway of the initial design. Dimensions, discharge values and expected maximum heights show calculated results agree with results of experimental studies of the structure and confirm that technically the labyrinth spillway is an attractive option. Labyrinth spillways can be particularly attractive for upgrading existing developments to satisfy more demanding design flood criteria in the limited right-of-way of an existing spillway. The Sainte Brigitte-des-Saults development in Quebec on the Nicolet Sud-Ouest River is a good case in point. Key words: flood control works, spillway, labyrinth weir, polygonal weir, nonrectilinear weir.[Journal translation]

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