PDF corrected surface chemistry
... colloidal solution when warmed or left in contact with water for a long time. The particles are already of colloidal size and they are readily dispersed in water forming colloidal solution. Sols of water insoluble high molecular weight compounds may similarly be obtained by their dispersal in ...
... colloidal solution when warmed or left in contact with water for a long time. The particles are already of colloidal size and they are readily dispersed in water forming colloidal solution. Sols of water insoluble high molecular weight compounds may similarly be obtained by their dispersal in ...
J. J. Thomson and The Electron: 1897–1899 An Introduction
... of April 30, 1897, in which he first put the subatomic proposal forward and George Fitzgerald’s commentary on this talk. Thomson’s October 1897 paper is extraordinary, a model of clarity as well as a watershed in the history of science. For twenty years I have been using it to initiate my course in ...
... of April 30, 1897, in which he first put the subatomic proposal forward and George Fitzgerald’s commentary on this talk. Thomson’s October 1897 paper is extraordinary, a model of clarity as well as a watershed in the history of science. For twenty years I have been using it to initiate my course in ...
Magnetic resonance imaging of alternating electric currents
... many stimulated echoes and “eight-ball” echoes [19] are also excited when tip angles of RF pulses in the AC-CDI sequence are imperfect. However, their amplitude is significantly lower than the amplitude of the main echo (provided that tip angle deviations are not too large) and therefore may be negl ...
... many stimulated echoes and “eight-ball” echoes [19] are also excited when tip angles of RF pulses in the AC-CDI sequence are imperfect. However, their amplitude is significantly lower than the amplitude of the main echo (provided that tip angle deviations are not too large) and therefore may be negl ...
1 Proton Chemical Shifts in NMR. Part 10.† Bromine and Iodine
... numerous investigations over many years there is still no generally accepted explanation of their substituent chemical shifts. Electric field, anisotropy and steric effects have all been proposed for bromine and iodine substituents but no quantitative explanation given2,3,4. Bothner-By and NaarColin ...
... numerous investigations over many years there is still no generally accepted explanation of their substituent chemical shifts. Electric field, anisotropy and steric effects have all been proposed for bromine and iodine substituents but no quantitative explanation given2,3,4. Bothner-By and NaarColin ...
BQ24040 数据资料 dataSheet 下载
... The bq2404x series of devices are highly integrated Li-ion linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters. The bq2 ...
... The bq2404x series of devices are highly integrated Li-ion linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters. The bq2 ...
LTC4060 - Standalone Linear NiMH/NiCd Fast Battery Charger
... SHDN (Pin 5): Active Low Shutdown Control Logic Input. When pulled low, charging stops and the LTC4060 supply current is minimized. PAUSE (Pin 6): Pause Enable Logic Input. The charger can be paused, turning off the charge current, disabling termination and stopping the timer when this pin is high. ...
... SHDN (Pin 5): Active Low Shutdown Control Logic Input. When pulled low, charging stops and the LTC4060 supply current is minimized. PAUSE (Pin 6): Pause Enable Logic Input. The charger can be paused, turning off the charge current, disabling termination and stopping the timer when this pin is high. ...
Electric charge
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative. Positively charged substances are repelled from other positively charged substances, but attracted to negatively charged substances; negatively charged substances are repelled from negative and attracted to positive. An object is negatively charged if it has an excess of electrons, and is otherwise positively charged or uncharged. The SI derived unit of electric charge is the coulomb (C), although in electrical engineering it is also common to use the ampere-hour (Ah), and in chemistry it is common to use the elementary charge (e) as a unit. The symbol Q is often used to denote charge. The early knowledge of how charged substances interact is now called classical electrodynamics, and is still very accurate if quantum effects do not need to be considered.The electric charge is a fundamental conserved property of some subatomic particles, which determines their electromagnetic interaction. Electrically charged matter is influenced by, and produces, electromagnetic fields. The interaction between a moving charge and an electromagnetic field is the source of the electromagnetic force, which is one of the four fundamental forces (See also: magnetic field).Twentieth-century experiments demonstrated that electric charge is quantized; that is, it comes in integer multiples of individual small units called the elementary charge, e, approximately equal to 6981160200000000000♠1.602×10−19 coulombs (except for particles called quarks, which have charges that are integer multiples of e/3). The proton has a charge of +e, and the electron has a charge of −e. The study of charged particles, and how their interactions are mediated by photons, is called quantum electrodynamics.