A Broadband Spectrum Channelizer With PWM-LO-Based Sub-Band Gain Control

Author(s):  
Ki Yong Kim ◽  
David Z. Pan ◽  
Ranjit Gharpurey
Author(s):  
N.S. Allen ◽  
R.D. Allen

Various methods of video-enhanced microscopy combine TV cameras with light microscopes creating images with improved resolution, contrast and visibility of fine detail, which can be recorded rapidly and relatively inexpensively. The AVEC (Allen Video-enhanced Contrast) method avoids polarizing rectifiers, since the microscope is operated at retardations of λ/9- λ/4, where no anomaly is seen in the Airy diffraction pattern. The iris diaphram is opened fully to match the numerical aperture of the condenser to that of the objective. Under these conditions, no image can be realized either by eye or photographically. Yet the image becomes visible using the Hamamatsu C-1000-01 binary camera, if the camera control unit is equipped with variable gain control and an offset knob (which sets a clamp voltage of a D.C. restoration circuit). The theoretical basis for these improvements has been described.


1968 ◽  
Vol 11 (4) ◽  
pp. 811-816 ◽  
Author(s):  
Maurice I. Mendel

Thirty infants, ranging in age from 4 to 11 months, were tested with five different recorded sounds that varied in bandwidth and temporal configuration: a continuous band of white noise, the same band of noise interrupted twice per second, the crinkling of onionskin paper, a narrow band of noise centered at 3000 Hz, and a warbled 3000 Hz tone. With loudness and duration of the stimuli held constant, more responses occurred to sounds composed of a broadband spectrum than to those of a limited bandwidth. Temporal configuration of the sound had no effect on the number of responses elicited.


2010 ◽  
Vol 24 (3) ◽  
pp. 198-209 ◽  
Author(s):  
Yan Wang ◽  
Jianhui Wu ◽  
Shimin Fu ◽  
Yuejia Luo

In the present study, we used event-related potentials (ERPs) and behavioral measurements in a peripherally cued line-orientation discrimination task to investigate the underlying mechanisms of orienting and focusing in voluntary and involuntary attention conditions. Informative peripheral cue (75% valid) with long stimulus onset asynchrony (SOA) was used in the voluntary attention condition; uninformative peripheral cue (50% valid) with short SOA was used in the involuntary attention condition. Both orienting and focusing were affected by attention type. Results for attention orienting in the voluntary attention condition confirmed the “sensory gain control theory,” as attention enhanced the amplitude of the early ERP components, P1 and N1, without latency changes. In the involuntary attention condition, compared with invalid trials, targets in the valid trials elicited larger and later contralateral P1 components, and smaller and later contralateral N1 components. Furthermore, but only in the voluntary attention condition, targets in the valid trials elicited larger N2 and P3 components than in the invalid trials. Attention focusing in the involuntary attention condition resulted in larger P1 components elicited by targets in small-cue trials compared to large-cue trials, whereas in the voluntary attention condition, larger P1 components were elicited by targets in large-cue trials than in small-cue trials. There was no interaction between orienting and focusing. These results suggest that orienting and focusing of visual-spatial attention are deployed independently regardless of attention type. In addition, the present results provide evidence of dissociation between voluntary and involuntary attention during the same task.


Author(s):  
Elżbieta Kosobudzka

SUMMARYThe article below focuses on the source analysis of the process of investigating Diocesan Curia in Lublin in the years 1946-1947, during the period when two Lublin ordinaries were in charge: Bishop Stefan Wyszyński (1946-1948) and Bishop Piotr Kałwa (1949-1974). Diocesan Curia, as the most important institution in the Church administrative hierarchy, was subject to intensive surveillance by PRL’s apparatus of repression.At the beginning, the process of investigating the management structure on the diocese level was not conducted by specially selected departments but was performed as a part of broadly conceived actions directed against Catholic clergy. In the years 1946-1948,when bishop Stefan Wyszyński was in charge, operational activities against the clergy and the bishops were led by 5th Section of 5th Department of Voivodeship Public Security Office (Sekcja V Wydziału V Wojewódzkiego Urzędu Bezpieczeństwa) in Lublin (until the February of 1953). It can be inferred from the recorded data that until 1949 the Diocesan Curia’s circle in Lublin was very poorly uncovered by Polish communist secret police and their activity amounted only to gathering and verifying data received from informants. The shortage of well-trained agents prevented taking more intensive actions against Bishop Wyszyński and Diocesan Curia in Lublin.In the years 1949-1974, when Bishop Piotr Kałwa was in charge, the 5th Section of the 5th Department of VPSO continued their operational activities aimed against the Lublin’s Curia. In 1953 a new department was created on the basis of 5th Section. The so-called 11th Department took over the entirety of cases pertaining to the Catholic Church. In 1955 the 11th Department was transformed into 6th Department of VPSO in Lublin. 3rd Department of VPSO in Lublin and 1st Section of 6th Department of Polish communist secret police of Voivodeship Polish Citizen Militia Headquarters in Lublin (referat Służby Bezpieczeństwa w Komendzie Wojewódzkiej Milicji Obywatelskiej), respectively, also conducted investigation activities concerning the bishops and Curia.As of 1949, the Diocesan Curia in Lublin was subject to intensive surveillance by the PRL’s security service apparatus. Its main aim at that point was to restrict the Curia’s activity so as to gain control over it. In order to achieve that, the activity of Curial employees and bishops was documented and revealed. Additionally, the conflicts between the bishops, Curial employees and KUL’s management were incited and deepened. What is more, the secret police attentively scrutinized bishops’ and Curial employees’ personal lives in order to gather compromising data, gained secret collaborators (47 secret agents were involved in the process) and limited Curia employees’ departures for studies abroad. Almost every type of operation activities was used against Bishop Piotr Kałwa. The secret police applied phone tapping, bugging, surveillance, reading mail and sending anonymous letters in order to undermine his authority. What is more, the secret police tried to set bishop Kałwa at variance with Primate Wyszyński. However, these actions did not change Bishops Kałwa’s stance who, until his death, unwaveringly defended the Catholic Church’s independence from the government.


2020 ◽  
Vol 47 (4) ◽  
pp. 71-95
Author(s):  
Maxine Davis ◽  
Melissa Jonson-Reid

Little is known about the role that religious-faith plays in the lives of men who have acted abusively against an intimate partner. Studies report mixed findings about the relationship between religious-faith and intimate partner violence/abuse (IPV/A) perpetration. This study explored the perceptions of Latino men involved in a parish-based partner abuse intervention program (PAIP). Two focus groups were conducted with members of the PAIP (N=18). Two major themes emerged. Participants reported using religious-faith as a mechanism for ending violence. However, participants also reported past misuse of religion in order to gain control over intimate partners. These apparently conflicting roles of religion were further elucidated in several sub-themes. Religious-faith is complex. This study offers insight into how faith may serve as both a risk and protective factor for IPV/A perpetration. Implications for how intervention programs may address participants’ religious-faith during treatment and how religio-spiritual abuse is measured are discussed.


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