Effect of type and shape of rods in separation time determining of glycerol in biodiesel by the buoyancy weighing bar method

2021 ◽  
Author(s):  
R. Tambun ◽  
I. J. Banjarnahor ◽  
A. N. Silaen ◽  
V. Alexander
Keyword(s):  
Separation Time

scholarly journals Numerical Study of Separation Characteristics of Piston-Type Explosive Bolt

2019 ◽  
Vol 2019 ◽  
pp. 1-18 ◽  
Author(s):  
Yanhua Li ◽  
Jingcheng Wang ◽  
Shihui Xiong ◽  
Li Cheng ◽  
Yuquan Wen ◽  
...  
Keyword(s):  
Numerical Study ◽  
Separation Process ◽  
Tensile Fracture ◽  
Shock Source ◽  
Separation Time ◽  
Separation Shock ◽  
High Shock ◽  
Release Device ◽  
Shock Response ◽  
The Impact

An explosive bolt is a simple, highly reliable, and efficient pyrotechnic release device widely used in spacecraft and rocket launchers. High shock transient response is generated during the separation of a release device, which tends to damage the nearby micromechanism and hardware. The purpose of this article is to predict the shock response of an explosive bolt. In this paper, the separation process of a piston-type explosive bolt is simulated by using a hydrocode named AUTODYN and the influence of the charge amount on separation time, separation speed, and separation shock is analyzed. Results show that piston-type explosive bolts obey a tensile fracture mechanism and that the critical charge amount for separation is 354–398 mg of PETN. The separation shock of such an explosive bolt mainly includes two aspects: the shock caused by explosive detonations and the impact of the piston at the end of the stroke. As the charge amount increases, the separation time decreases, the speed of the piston and screw increases first and then decreases, and the separation shock first increases and then stabilizes. On a simple aluminum plate, the shock response decreases as the distance from the shock source increases, obeying the power function attenuation law.

Umbilical cord separation time: chlorhexidine vs methylated-spirit

2019 ◽  
Vol 13 (3) ◽  
pp. 1-9
Author(s):  
Miriam-Hilda Okpaleke ◽  
Chizoma M Ndikom
Keyword(s):  
Umbilical Cord ◽  
Sampling Technique ◽  
Study Groups ◽  
Health Centers ◽  
Separation Time ◽  
Significant Difference ◽  
Quasi Experimental ◽  
Multistage Sampling ◽  
Mean Time ◽  
Chlorhexidine Gel

Background Use of topical antiseptics could reduce the incidence of infection; however, studies have suggested that some antiseptics prolong the time for cord separation when compared with others. Aims To compare the umbilical cord separation time between neonates receiving 7.1% chlorhexidine gel and methylated spirit. Methods A quasi-experimental research design was employed for this study. A multistage sampling technique was used to select three primary health centers in Ibadan, Nigeria. A total of 212 newborns (118 newborns in the chlorhexidine group and 94 in the methylated spirit group) were enrolled into the study. Findings There was a statistically significant difference in mean time to cord separation between chlorhexidine (9.53 ± 4.559 days) and methylated-spirit group (7.98 ± 2.984) (t=2.840; P=0.005). Conclusions Chlorhexidine gel prolongs cord separation when compared to methylated spirit. Prolonged cord separation time was the major cause of dissatisfaction in the two study groups. The increased cord separation time associated with chlorhexidine should not eliminate it in settings where the risk of cord infection is high, but mothers should be informed of this.

Design and Fabrication of a Palm Kernel Nut and Shell Separating Machine

2013 ◽  
Vol 824 ◽  
pp. 262-271
Author(s):  
John A. Akpobi ◽  
M.J. Omoregie
Keyword(s):  
Palm Kernel ◽  
Design Engineering ◽  
Mean Values ◽  
Design Procedures ◽  
Separation Time ◽  
Input Capacity ◽  
Standard Design ◽  
Manufacturing Methods ◽  
Overall Efficiency ◽  
Novel Design

This paper presents a novel design and fabrication of a palm kernel nut and shell separating machine to improve the turnout rate as well as the overall efficiency of the machine. Standard design procedures were adapted from Design Engineering text and hand books, in the specifications and computation of dimensions of various components of the machine. Seven repetitions were carried out in the measurements of input and separated nuts and shells as basis for computing mean values and efficiencies. The components of the kernel nut and shell separating machine were designed and fabricated from locally available materials using manufacturing methods explained in the paper. Suitable tests were done and the over-all performance was found to be satisfactory. The machine has an input capacity of 29.42 kg by weight, a mean separation time of 50.75 seconds and an overall efficiency of 96.59 %. This is a very simple and effective machine.

A High-Gradient Magnetic Separation System for Separating Magnetic Nanobeads from Aqueous Solution

2012 ◽  
Vol 505 ◽  
pp. 39-43
Author(s):  
Xiao Fei Yan ◽  
Jian Han Lin ◽  
Rong Hui Wang ◽  
Mao Hua Wang ◽  
Dong An ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Magnetic Separation ◽  
Flow Rate ◽  
Separation System ◽  
Magnetic Separator ◽  
High Gradient Magnetic Separation ◽  
High Gradient ◽  
Separation Time ◽  
Electronic Timer ◽  
Magnetic Nanobeads

Magnetic separation is an emerging and promising technology in biological sample preparation. In this paper, a high-intensity and high-gradient magnetic separation system was developed to separate magnetic nanobeads from aqueous solution. This system mainly consisted of a magnetic separator, a micropump and an electronic timer. The magnetic separator was designed by placing two columns of permanent magnets in an aluminum holder. Two magnets in each column were laid out in repelling mode and a hole between the two columns was used to accommodate a 1.5 ml tube. Working with the electronic timer, the micropump was employed to remove waste solution at a certain rate after magnetic nanobeads captured onto the sides of the tube wall. The experiments for separation of magnetic nanobeads with diameters of 150 nm and 50 nm using the developed magnetic separation system were conducted to optimize the key parameters of the system including nanobeads concentration, separation time and flow rate. The separation efficiencies of magnetic nanobeads increased as the nanobeads concentration and the separation time increased, whereas decreased when the flow rate was increased. Experimental results proved that the proposed magnetic separation system was able to separate magnetic nanobeads (diameters of 150 nm and 50 nm) with separation efficiencies of 99% and 90% in 30 min and 150 min respectively.

Investigation of a Gas-Solid Fluidized Bed for Lump Coal Separation

2013 ◽  
Vol 868 ◽  
pp. 433-436
Author(s):  
Xiao Nan Zhao ◽  
Lu Bin Wei ◽  
Yu Fu ◽  
Mo Han Zhang ◽  
Yi Yao Wang
Keyword(s):  
Fluidized Bed ◽  
Flow Rate ◽  
Air Flow ◽  
Operating Parameters ◽  
Air Flow Rate ◽  
Separation Effect ◽  
Separation Time ◽  
Bed Height ◽  
Lump Coal

The influences of operating parameters (bed height, air flow rate, and separation time) on the separation effect for lump coal were experimentally studied. The results show that shallow bed takes less time to reach steady separation state comparing with the deep bed. Increasing separation time at low air flow rate and decreasing separation time at high air flow rate could improve the separation effect. Separation effect could get the optimal under the condensation of bed height at 90mm, air flow rate at 8m3/h and separation time at 60s.

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