摘要:
A field effect transistor (FET) with high withstand voltage and high performance is realized by designing a buffer layer structure appropriately to reduce a leakage current to 1×10−9 A or less when a low voltage is applied. An epitaxial wafer for a field effect transistor comprising a buffer layer 2, an active layer, and a contact layer on a semi-insulating substrate 1 from the bottom, and the buffer layer 2 includes a plurality of layers, and a p-type buffer layer composed of p-type AlxGa1−xAs (0.3≦x ≦1) is provided as a bottom layer (undermost layer) 2a. A Nd product of a film thickness of the p-type buffer layer and a p-type carrier concentration of the p-type buffer layer is within a range from 1×1010 to 1×1012/cm2.
摘要翻译:当施加低电压时,通过适当地设计缓冲层结构以将漏电流减小到1×10 -9 A或更小来实现具有高耐压和高性能的场效应晶体管(FET)。 一种用于场效应晶体管的外延晶片,包括从底部到半绝缘基板1上的缓冲层2,有源层和接触层,缓冲层2包括多个层,以及p型缓冲层 提供由p型Al x Ga 1-x As As(0.3 <= x <= 1)构成的层作为底层(最下层)2a。 p型缓冲层和所述p型缓冲层的p型载流子浓度的膜厚度的钕产品的范围内从1×10 10 SUP>至1×10 12 SUP> / cm 2。
摘要:
A non-aqueous electrolyte containing propylene carbonate and 1,3-propanesultone as additives can reduce the amount of a gas evolved during storage at a high temperature of a non-aqueous electrolyte secondary cell comprising the electrolyte, a non-aqueous electrolyte containing at least one compound selected from the group consisting of vinylene carbonate, diphenyl disulfide, di-p-tolydisulfide and bis(4-methoxyphenyl)disulfide as comprising the electrolyte, and a non-aqueous electrolyte containing a combination of the above-two types of additives can provide a non-aqueous electrolyte secondary cell exhibiting excellent retention of capacity and storage stability.
摘要:
A piezoelectric transducer for an ultrasonic scan is provided. The transducer includes a plurality of piezoelectric members arrayed. The plurality of piezoelectric members have different compositions parts in a slice direction so that an ultrasonic beam is focused in the slice direction.
摘要:
An ultrasonic probe includes ultrasonic piezoelectric elements that are arranged in a first direction at predetermined intervals and transmit and receive ultrasonic waves in a second direction substantially orthogonal to the first direction. The respective ultrasonic piezoelectric elements have plural grooves, which are parallel to the first direction and do not pierce through an end face, on at least one end face of two end faces substantially orthogonal to the second direction of the respective ultrasonic piezoelectric elements. The ultrasonic waves are weighted in a third direction orthogonal to the first direction and the second direction according to shapes and arrangement of the respective plural grooves and transmitted and received. In addition, a conductive member is joined to the end face having the grooves of the respective ultrasonic piezoelectric elements along the third direction.
摘要:
A sound reproduction system has pairs of sound emitters that subtend different angles Θ, the span angle, at the listener position. The pairs of sound emitters are arranged to be excited by different frequency bands of the signal output from an inverse filter means (Hh, Hl). The operational span-frequency range of the pairs of sound emitters is determined by an equation (I) where the transducer span Θ is the angle subtended at the listener by a pair of transducers, where O
摘要翻译:声音再现系统具有对声音发射器,它们对应于收听者位置处的不同角度Theta,跨度角度。 发声器对被布置成由反向滤波器装置(H H h H 1,H L 1)输出的信号的不同频带激发。 发声器对的操作跨度频率范围由等式(I)确定,其中换能器跨度Theta是由一对换能器对准在倾听者处的角度,其中O :是声速,Deltar:是耳朵之间的等效距离。 声音发射器可以是分立的扬声器单元,不同的单元对定位在不同的跨度角,或者它们由扩展换能器的区域部分(图10)构成。 当使用离散扬声器单元时,使用交叉滤波器(图28)将不同频带中的驱动信号提供给不同的扬声器对。 当使用扩展换能器时,换能器的振动传播特性可以被布置成从位于换能器的较高频率发射端处的激励装置过滤沿换能器传递的振动。
摘要:
The object of this invention is to provide a novel pharmaceutical composition for getting rid of pains and anxiety in patients. This invention relates to a pharmaceutical composition containing lactoferrin as an active ingredient. The composition of this invention is useful for treatment of at least one disease or condition selected from the group consisting of pains, including the phase 1 pain and the phase 2 pain, anxiety and stress. The composition is particularly beneficial to alleviating or getting rid of the pain and anxiety which significantly lower quality of life of patients with end-stage cancer. The composition of this invention is also useful for treatment of pains, including the phase 1 pain and the phase 2 pain, and inflammation which accompany arthritis or diseases in the junctions of bones (e.g. rheumatoid arthritis, osteoarthritis, frozen shoulder, sports injuries such as tennis elbow and baseball shoulder, and low back pain).
摘要:
A CD-ROM is provided with an area for forming a character/graphic pattern. The character/graphic pattern is formed in such a way that data, which generate on the CD-ROM two sorts of pit patterns having average reflectances different from each other to a perceptible extent, are respectively recorded inside and outside the character/graphic pattern. Unless an illegal copy disc is produced by duplicating the legal original disc of the CD-ROM at a very high precision, the character/graphic pattern of the copy disc is invisibly deformed by the discrepancy between the arrangements of the pit patterns of the copy disc and the original disc.
摘要:
A television signal receiving apparatus which can read program information relevant to a television program from an optical disk medium, interlocked with the television program and can reproduce and display the read program information. Program information (broadcasting information including program names, broadcasting channel names and broadcasting dates and times and appendant information relevant to the contents of the programs) relevant to the television programs to be displayed by the television receiver/display is recorded in the optical disk medium. When a user instructs a display of the program information by the selection and decision input unit, the television control unit transmits the display request and time information from the clock apparatus to the control unit of the optical disk unit. The control unit makes the appendant information to be reproduced from the optical disk medium, by using the broadcasting channel name and the time information as retrieval information. The appendant information is sent to the television receiver/display through the interface and is displayed in a picture and sound.
摘要:
In a wire bonding apparatus used in manufacturing, for instance, semiconductor devices, a cover is attached to a detection image intake section of the camera mirror tube of a camera which detects the bonding points of a semiconductor workpiece, and the cover covers an area where a variation in air density occurs between the detection image intake section of the camera mirror tube and the semiconductor workpiece.
摘要:
Digitally-compressed audio and image data of a plurality of programs (logical channels) are distributed and superimposed for every horizontal synchronizing signal period together with identification information of each of the programs in place of a luminance signal of an analog video signal of each of physical channels. Each of the physical channels is superimposed in its frequency and distributed from a signal transmission facility of a broadcasting station. At the receiving side, a desired physical analog channel is tuned and the compressed digital audio and image data superimposed on the tuned video signal are selected and taken as desired logical channel data in reference to program identification information, and the compressed digital audio and image data are decoded to obtain their original audio and moving images. With such an arrangement as above, in an existing CATV system, a mere insertion of an encoder unit into a transmission side and a decoder unit into a receiving side, without improving a characteristic of an analog video signal distribution system such as a cable or the like, respectively, enables a greater number of programs to be supplied correspondingly by the amount of digital compression.