Abstract: To identify colors of objects as natural as those seen in naked eye view, it is provided a method of designing a colored lens specified by color coordinate values L, a, and b in a uniform color space, including: selecting a=+0.35 and b=+3.0 in L=87.4, a=?0.25 and b=+1.6 in L=74.2, and a=+1.5 and b=+3.35 in L=49.9 as target values in an a-b plane determined from the L-value, respectively; setting ?4.3?a?+5 and ?3?b?+9 in L=87.4, ?3.5?a?+3 and ?5?b?+8.2 in L=74.2, and ?1.5?a?+4.5 and ?0.5?b?+7.2 in L=49.9 as deviation ranges, respectively; forming an allowable range by connecting vertexes of the deviation ranges in L=87.4, L=74.2, and L=49.9 by second-order polynomial approximation curves in the uniform color space; and selecting the values L, a, and b of the colored lens so as to be included in the allowable range in the uniform color space.

Abstract: To identify colors of objects as natural as those seen in naked eye view, it is provided a method of designing a colored lens specified by color coordinate values L, a, and b in a uniform color space, including: selecting a=+0.35 and b=+3.0 in L=87.4, a=?0.25 and b=+1.6 in L=74.2, and a=+1.5 and b=+3.35 in L=49.9 as target values in an a-b plane determined from the L-value, respectively; setting ?4.3?a?+5 and ?3?b?+9 in L=87.4, ?3.5?a?+3 and ?5?b?+8.2 in L=74.2, and ?1.5?a?+4.5 and ?0.5?b?+7.2 in L=49.9 as deviation ranges, respectively; forming an allowable range by connecting vertexes of the deviation ranges in L=87.4, L=74.2, and L=49.9 by second-order polynomial approximation curves in the uniform color space; and selecting the values L, a, and b of the colored lens so as to be included in the allowable range in the uniform color space.

Abstract: When an improving material used for ground improving construction is ejected into the ground, an improving material having a predetermined gel time is ejected through a vast number of points simultaneously or selectively from ejection ports provided in improving material transport passages such that the positions of the ejection ports are offset. The improving material can be ejected through the vast number of points as designed. A stroke, start and stop of an advancing and retreating movement adjusting device can be adjusted through a screw of the advancing and retreating movement adjusting device. A slide guide as a supporting mechanism is fitted to a slide bar so that even if a load deviated with respect to a piston rod is applied. The piston can be advanced and retreated smoothly, and an automatic on-off valve is interposed in the piston so that the improving material can be intaken and discharged smoothly.

Abstract: When an improving material used for ground improving construction is ejected into the ground, an improving material having a predetermined gel time is ejected through a vast number of points simultaneously or selectively from ejection ports provided in improving material transport passages such that the positions of the ejection ports are offset. The improving material can be ejected through the vast number of points as designed. A stroke, start and stop of an advancing and retreating movement adjusting device can be adjusted through a screw of the advancing and retreating movement adjusting device. A slide guide as a supporting mechanism is fitted to a slide bar so that even if a load deviated with respect to a piston rod is applied. The piston can be advanced and retreated smoothly, and an automatic on-off valve is interposed in the piston so that the improving material can be intaken and discharged smoothly.

Abstract: A phase tracked loop frequency demodulator having a phase comparator receptive of a frequency modulated signal and a peak-shifting filter for imparting a constant phase shift of 90.degree. over the full range of its instantaneous frequencies in response to a feedback control signal to permit the phase comparator to compare the non-phase shifted and phase shifted signals. The carrier frequency components of the output from the comparator are eliminated by means of a second filter to derive a demodulated signal which is used as the control signal. In order to eliminate high frequency limitations of the peak-shifting filter, this filter is comprised of a variable reactance element and a complementary reactance element so connected thereto to form a resonant circuit which possesses a quadratic frequency response characteristic with a resonant peak at the upper or lower frequency end of the passband.