Thứ Hai, 15 tháng 12, 2014
Chủ Nhật, 14 tháng 12, 2014
Thứ Bảy, 13 tháng 12, 2014
How successful people stay calm
By Travis Bradberry
The ability to manage your emotions and remain calm under pressure has a direct link to your performance. TalentSmart has conducted research with more than a million people, and we’ve found that 90% of top performers are skilled at managing their emotions in times of stress in order to remain calm and in control.
Thủ·phạm giết người man rợ ở Suwon đã bị bắt
Lại là người Trung Quốc
2 vụ giết người (phụ nữ) và cắt thi thể thành nhiều mảnh ở Suwon (2012 và 2014) diễn ra ở hai địa điểm chỉ cách nhau 1 km và thủ phạm đều là người gốc Trung Quốc. Vụ năm 2012 đã khiến Cảnh sát trưởng Hàn Quốc phải từ chức. Sau đó tòa tuyên án tù chung thân chứ không tử hình tội phạm làm dân Hàn phẫn nộ.  |
| Police release a photo of a suspect in the "Suwon torso murder" case on Dec. 13, 2014. The suspect was identified as Park Chun-bong, a 55-year-old Chinese national of Korean ethnicity. (Yonhap) |
Korean-Chinese man confesses to 'Suwon torso murder'
Một người đàn·ông Trung·Quốc gốc Hàn thú·nhận giết người man·rợ
SUWON, South Korea, Dec. 13 (Yonhap) -- A 55-year-old Chinese man of Korean ethnicity on Saturday confessed to killing a woman and brutally butchering her body before abandoning it, police said.
Operating principle of ultrasonic humidifier
Physical conditions/advantages
BOGA GmbH is a manufacturer of high-quality humidification systems according to the ultrasonic principle. Our devices are used in all industrial sectors and branches - see reference list. In the following text you will find some explanations concerning the humidification principle.
Information on ultrasonic humidification
Air conditioning by ultrasound has become more and more important within the last few years and gained more market segments. There are so many advantages of ultrasonic humidification that the higher purchase price will soon amortise compared to classical systems, especially due to its extremely low operating costs.
The operating principle and the advantages of our humidifiers working according to the ultrasonic principle compared to classical humidification systems are as follows.
The operating principle and the advantages of our humidifiers working according to the ultrasonic principle compared to classical humidification systems are as follows.
Operating principle:
a) Physical conditions
When certain crystals are deformed by mechanical stress, electrical charge is build up proportionally on them, producing an electric field strength in the crystal.
Jacques and Pierre Curie discovered this phenomenon in 1880. Even the reversal of this so-called piezoelectric effect or Piezo-effect is possible; materials change their dimensions under the influence of an electric field.
Ceramic piezoelectric materials are hard, chemically inactive and completely insensitive to humidity or other atmospheric influences.
The human ear is able to hear frequencies between 16-20.000 Hz. All higher frequencies are called ultrasound.
Vibrations occur as a result of pressure changes. Repeated pressure increase and decrease produce different sound waves.
In order to use ultrasound waves for air humidification, electrical energy must be transformed into mechanical energy. This is done in the piezoelectric transformer (also called ultrasonic generator or transducer).
Therefore, a vibration unit consists of the resonant circuit, in which the high frequency of about 1.7 MHz is produced, and the piezoelectric transformer which transforms the electrical frequency into a proportional mechanical vibration.
Due to their physical nature, sound waves consist of mechanical vibrations of compressible media. These vibrations occur due to a displacement of equilibrium of the particles of a compressible material. Due to their own mobility and gravitation these particles are periodically moving to and fro their original position. Sound waves are tied to a medium and cannot exist in a vacuum.
The Piezo-ceramic transformers are attached to the bottom of the water reservoir of the humidifier. With excitation of this transformer the water transports the ultrasound vibrations to the boundary layer water-air. Constant compression /decompression of the water column above the transformer causes cavitation in the immediate vicinity of the water surface. Crossed capillary waves are formed, from which very small mist droplets (aerosols) are cast off in the wave crest.
The aerosols are blown out by the air blast in the humidifier and very soon mingle with the surrounding air. They have a very small diameter (~ 0.001 - 0.005 mm) and therefore form a freely floating mist. The average droplet diameter depends on the surface tension s and the density r of the medium as well as on the excitation frequency. The higher the excitation frequency, the smaller the average droplet diameter.
Jacques and Pierre Curie discovered this phenomenon in 1880. Even the reversal of this so-called piezoelectric effect or Piezo-effect is possible; materials change their dimensions under the influence of an electric field.
Ceramic piezoelectric materials are hard, chemically inactive and completely insensitive to humidity or other atmospheric influences.
The human ear is able to hear frequencies between 16-20.000 Hz. All higher frequencies are called ultrasound.
Vibrations occur as a result of pressure changes. Repeated pressure increase and decrease produce different sound waves.
In order to use ultrasound waves for air humidification, electrical energy must be transformed into mechanical energy. This is done in the piezoelectric transformer (also called ultrasonic generator or transducer).
Therefore, a vibration unit consists of the resonant circuit, in which the high frequency of about 1.7 MHz is produced, and the piezoelectric transformer which transforms the electrical frequency into a proportional mechanical vibration.
Due to their physical nature, sound waves consist of mechanical vibrations of compressible media. These vibrations occur due to a displacement of equilibrium of the particles of a compressible material. Due to their own mobility and gravitation these particles are periodically moving to and fro their original position. Sound waves are tied to a medium and cannot exist in a vacuum.
The Piezo-ceramic transformers are attached to the bottom of the water reservoir of the humidifier. With excitation of this transformer the water transports the ultrasound vibrations to the boundary layer water-air. Constant compression /decompression of the water column above the transformer causes cavitation in the immediate vicinity of the water surface. Crossed capillary waves are formed, from which very small mist droplets (aerosols) are cast off in the wave crest.The aerosols are blown out by the air blast in the humidifier and very soon mingle with the surrounding air. They have a very small diameter (~ 0.001 - 0.005 mm) and therefore form a freely floating mist. The average droplet diameter depends on the surface tension s and the density r of the medium as well as on the excitation frequency. The higher the excitation frequency, the smaller the average droplet diameter.
b) Operation of the ultrasonic air humidifier
Advantages:
- Maximum energy saving
In comparison with steam humidifiers of the same output, the AIRWIN ultrasonic humidifier requires up to 93% less electrical energy. - Minimum connected load
In comparison with electrode-type steam humidifiers, only approximately 7% of the connected load is required for the same humidifier output. This means significantly lower connection costs. - Energy-saving cooling effect
When humidification is carried out by the AIRWIN ultrasonic humidifier room cooling takes place as a result of the adiabatic humidification principle. - Minimal water consumption
Atomiser humidifiers have a water loss of up to 70%, steam humidifiers a loss of up to 30%. With the AIRWIN ultrasonic humidifiers there is no water loss. - Immediate maximum humidification
Humidification takes place without any form of delay when switched on. The proportional control is designed for all control signals. - Maximum water vaporisation
The AIRWIN ultrasonic humidifiers produce a very fine aerosol mist. The particle diameter of the aerosols is only 0.001mm on average. Thus, the mist disseminates quickly and is very quickly absorbed by the air.
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