A new method for detecting intramolecular H-bonds of aromatic amides based on de-shielding effect of carbonyl on β-protons

2021 ◽  
Author(s):  
Jing Min ◽  
Chunyu Wang ◽  
Liyan Wang
Keyword(s):  
Charge Transport ◽  
New Method ◽  
Shielding Effect ◽  
Aromatic Amide

Aromatic amide foldamers with highly predictable conformations possess the potential of application in the fields of stereoselective recognition, charge transport and catalysis, whose conformations are commonly limited by the intramolecular...

scholarly journals Development of Method Enhanced Laser Ablation Efficiency According to Fine Curvature of the Polymer through the Preliminary Preparation Process Using UV Picosecond Laser

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 959 ◽  
Author(s):  
Seung Sik Ham ◽  
Ho Lee
Keyword(s):  
Laser Processing ◽  
Pulsed Laser ◽  
Picosecond Laser ◽  
Processing Method ◽  
New Method ◽  
Shielding Effect ◽  
Ablation Efficiency ◽  
Preliminary Preparation ◽  
Ultrashort Pulsed Laser ◽  
New Processing

In processes using the ultrashort pulsed laser, the phenomenon that the ablation efficiency is reduced due to the increase of the shielding effect of the generated plume is increasingly caused by the use of the high power and high repetition rate. A new method is needed to prevent a decrease in ablation efficiency in processing using an ultrashort pulsed laser. In this study, the proposed a processing method that can improve the ablation efficiency by providing an efficient escape path of plume, and examine the feasibility of a new processing method. The new method we proposed is a method of laser processing after generating a fine curvature in the polymer as a preliminary preparation. The fine curvature of the polymer produced by the preliminary preparation induces an artificial chimney-like opening along the path of the incident beam during laser processing, thereby enabling the plume to be effectively removed. The experiment for examine the feasibility through a new method was conducted using a 10-picosecond laser of UV wavelength with two optical systems. As a new processing method, when processing with ultrashort pulse laser, it was observed that the ablation efficiency improved.

Extraction Current Transients: New Method of Study of Charge Transport in Microcrystalline Silicon

2000 ◽  
Vol 84 (21) ◽  
pp. 4946-4949 ◽  
Author(s):  
G. Juška ◽  
K. Arlauskas ◽  
M. Viliūnas ◽  
J. Kočka
Keyword(s):  
Charge Transport ◽  
New Method ◽  
Microcrystalline Silicon ◽  
Current Transients

Study on Dynamic Positioning Capacity Analysis Method Considering Wind Shielding Effect of Offshore Structure

2021 ◽  
pp. 1-11
Author(s):  
Jinhui He ◽  
Haibin Zhang ◽  
Renchuan Zhu
Keyword(s):  
Time Domain ◽  
Offshore Structures ◽  
Wind Load ◽  
New Method ◽  
Shielding Effect ◽  
Capacity Analysis ◽  
Dynamic Positioning ◽  
Time Domain Simulation ◽  
Environmental Loads ◽  
Load Calculation

Offshore structures floating at sea should use their dynamic positioning (DP) system to maintain position and heading against environmental loads, including wave loads, current loads, and wind loads. It is difficult to calculate environmental loads accurately and quickly, especially for wind loads due to the shielding effect of different parts on offshore structures. To improve the accuracy of wind load calculation, a new method considering shielding effect is proposed. With the new method, calculated wind force becomes much closer to wind tunnel test than the traditional method. As input data of DP capacity analysis, the environmental loads have critical impact on the design of DP system. A static method and a time-domain simulation method of DP capacity are also proposed, and a case study of drillship is carried out. The results of both static analysis and time-domain simulation of DP capacity show that the new wind load calculation method has improved the accuracy of environmental load calculation and DP capacity analysis. Introduction As the offshore oil and gas exploitation is going further into deep sea, offshore structures are to be used in harsh marine environments, including strong wind, current, and waves. Especially for wind, it can make great effect on the dynamic positioning (DP) system of offshore structures, which is designed to maintain position and heading. Once the DP system is not able to keep the offshore structures’ position and heading, it will cause an accident such as oil leakage and oil pollution in the ocean. Because of the wind shielding effect among all parts on offshore structures, such as deckhouse, derricks, cranes, pipe racks, the wind load is difficult to calculate accurately and quickly.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

A new method for the determination of nitrates

1960 ◽  
Vol 23 ◽  
pp. 227-232 ◽  
Author(s):  
P WEST ◽  
G LYLES
Keyword(s):  
New Method
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