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The (e,2e) spectrometer vacuum chamber (figure 1) is manufactured from 304 grade stainless steel, the construction being carried out by Vacuum Generators using a design of Jones, Read and Cvejanovic, full details of which may be found in T. 3mm thick mu-metal magnetic shielding is placed both internally and externally to decrease extraneous external magnetic fields to less than 5mG at the interaction region.
All inputs and outputs to the spectrometer pass through the vacuum chamber via feedthroughs on the top flange. The top flange of the vacuum system is a 25mm stainless steel flange with 11 conflat CF70 flanges arranged around a central 200mm flange designed for locating a hydrogen source. Two flanges are used for the high voltage channeltron and photomultiplier tube inputs and pulse outputs. Three rotary motion feedthroughs allow the analysers and electron gun angles to be changed externally via stepper motors for both analysers and for the electron gun. The ionisation gauge is placed at right angles to the main flange to prevent light from the thoriated iridium filament entering the vacuum system, which would increase noise on the photomultiplier tube. The ionisation gauge feedthrough is sooted, and a loose cover is placed over the entrance in the chamber flange to prevent stray light from the ion gauge entering the vacuum system. The target gas enters the system via a CF70 flange which has two 6mm stainless steel tubes welded into the flange. The other gas feed is connected to a hypodermic needle set at 90A° to the incident beam for measurements in other geometries.
The gas jet which is not currently used in the interaction region can be used to non-locally fill the chamber with gas for background counting measurements. The final CF70 flange is used when the photomultiplier tube is cooled, usually during baking of the system following exposure to atmosphere. The tube is cooled by passing vapour from a liquid nitrogen source through expansion coils wrapped around the photomultiplier tube housing. The electron gun is a two stage non-selected gun designed by Woolf (Ph.D thesis, University of Manchester) (see figure 3).
The gun consists of a filament, grid and anode source which is focussed using a triple aperture lens through two 1mm defining apertures in the centre of the gun.
The apertures define the electron beam pencil and beam angles, and are focussed onto the interaction region using a second triple aperture lens located between the apertures and interaction region.
The electron gun is shielded using advance (constantin) sheet which is grounded to the body of the gun mounting. The gun is mounted onto an x-y translation table to allow placement of the electron beam as accurately as possible to the centre of rotation of the analysers and electron gun rotation axis. The gas jet is mounted from the electron gun using a narrow support of 310 stainless steel, and the Faraday cup can be attached to this support. The original unselected electron gun built by Woolf was completely rewired and a custom built PTFE 25 way inline wire-wrap plug and socket was placed between the 52 way vacuum electrical feedthrough and the electron gun. The wiring from the 52 way feedthrough to the inline plug is shielded colour coded 30 awg PTFE coated advance wire, and the inline plug and socket connectors are non-magnetic gold plated wire wrap pins. The electron analysers are constructed from molybdenum and are mounted from two rotating gear plates controlled externally via the rotation feedthroughs on the top flange (see figure 2).
The input electrostatic lenses for each analyser are three element cylindrical lenses as shown in figure 4.
The interaction region is focussed onto the entrance aperture of the hemispherical energy analysers with a beam angle of around zero degrees, the image of the analyser entrance aperture being larger than the size of the interaction region. Field gradients around the input and exit apertures are corrected using standard Jost correctors.
The energy selected electrons passing through the exit apertures are finally collected by Mullard X919BL channel electron multipliers which amplify the single electron to produce a current pulse at their output. A principle source of noise on the signal pulses arises from the turbo-molecular pump motor. The noise from the turbo pump is reduced to ~ 5mV using these techniques, and as the average pulse height from the saturated multiplier is around 20-40 mV, this allows adequate discrimination following amplification.
The pre-amplifiers located external to the vacuum system are commercial 100X preamplifiers with 400pS rise-times, manufactured by Phillips Scientific. The NIM signals produced by the discriminators drive two ORTEC 437 Time to Amplitude Converter's via appropriate delay cables and an ORTEC pulse delay unit. The main TAC output feeds an ORTEC Multichannel Analyser card located in the PC controlling the experiment, whereas the second monitor TAC drives an external MCA, allowing convenient monitoring of the coincidence signal as the experiment progresses. The high voltage supplies to the electron multipliers are two Brandenberg 5kV supplies controlled by the main PC via serial DAC's.
Principally the filter is used to reduce pickup noise from entering via the HT cable onto the multiplier output.
Secondly, the filter has a slow response time for high voltage spikes, and reduces the probability of damage to the pulse electronics should the EHT supply suddenly turn on or off.
Capacitor C2 decouples the 1kW load resistor to earth for high frequency pulses from the CEM's, and the voltage appearing across this load is connected via the capacitor C3 to the input of the 6954 preamplifier. Since the input impedance of the preamplifier is 50W and the CEM is effectively an ideal constant current supply, most of the current passes through to the preamplifier. Finally, the 10M resistor prevents the output to the preamp from rising above ground when the preamp is disconnected from the circuit and is therefore a safety device for the preamplifier when initially connected.
The original design placed the atomic beam nozzle and Faraday cup on the same support structure fixed to the body of the electron gun, with the atomic beam direction being in the detection plane when the perpendicular plane geometry is chosen (see figure 2).
A second configuration is adopted for exclusively perpendicular plane coincidence experiments, the atomic beam nozzle being oriented at an angle of 45A° to the detection plane so that the gas effusing from the nozzle does not fill the analysers when they oppose the nozzle (see figure 6). In this configuration the support strut for the atomic beam nozzle is terminated lower than the detection plane, as is the nozzle itself. For non-perpendicular plane measurements the Faraday cup is once mounted from the support strut and the gas effuses perpendicular to the electron beam direction. One difficulty when aligning an (e,2e) coincidence experiment lies in the focussing the incident electron beam and analysers onto the interaction region.
The throughput of electron current as detected by the Faraday cup is insensitive to both position and focusing of the electron beam, since the cup opening is usually made quite large (in this case 6 - 10mm) and the bias voltage applied to the cup to prevent electrons returning to the interaction region allows all electron trajectories within this opening to be detected. Conventionally, following maximisation of the Faraday cup current, the beam is steered and focussed onto the gas jet as detected by counts in the analysers. This has the disadvantage that the overlap volume is maximised for both atomic and electron beam density, which tends to place the interaction volume as close as possible to the output of the atomic beam nozzle, which is almost certainly not in the centre of the detection plane.
To eliminate the need for time consuming iterative techniques and the associated errors due to detection geometry, a separate method for tuning the electron gun is adopted that does not depend upon the analysers. The interaction between the target and the electron beam not only produces ionisation, but the valence states of the target also are excited with various probabilities depending upon the incident energy of the electron beam.
These photons are detected by the photomultiplier tube, by placing a 450nm A± 50nm optical filter in front of the photocathode. The interaction region is therefore defined where an aperture in front of the photocathode is focused by the lens. The plano-convex focussing glass lens is covered by a grounded fine tungsten mesh to eliminate surface charging. The photomultiplier tube may be cooled by circulating nitrogen gas boiled off LN2 through copper coils encircling the photomultiplier tube housing. The photomultiplier tube used in the experiment is a 9789QB EMI photomultiplier tube with a bi-alkali photocathode peaking in the blue region of the optical spectrum.
As with the electron multiplier circuitry, it is important to optimise the load of the photomultiplier tube so that reflections along the feeder line to the counting electronics are minimised. The 1nF 6kV capacitors across the dynodes close to the output stage are used as charge storage pumps that quickly refurbish the surface charge on the dynodes, allowing increased counting rates.
The dynode resistors are 1% tolerance metal film resistors as these are more stable with temperature.
The EHT supply to the photomultiplier tube is a Brandenberg 2kV supply operating at 1500V for this tube. The negative going output pulses from the tube measure typically 200-500mV in height, and therefore are able to directly drive an ORTEC 473A constant fraction discriminator located in one of the NIM crates.
All resistors and capacitors for the dynode chain are soldered to the photomultiplier tube base internal to the vacuum system, using standard 5-core solder. Typical pulse heights from the electron multipliers in saturation mode are 25-40mV, whereas the typical height of the photomultiplier tube pulses is of the order of 250mV. The electron multiplier pulses are obtained from the multiplier supply circuitry as explained above. The amplified pulses from the 6954 amplifiers pass along doubly shielded RG-58 cable to the input of the ORTEC 473A discriminators. The two analyser discriminators are located in separate NIM crates to increase isolation and reduce common mode pickup.
The slow rise-time positive outputs from the 473A discriminators pass to three ORTEC 441 rate-meters which allow counting and monitoring of the pulses. The fast NIM pulses from the analyser 473A CFD's pass through appropriate delay lines to two 437 TAC's.
This second multichannel analyser allows the operator to monitor the total accumulated coincidence signal during operation. The lens supplies that control the voltages impressed onto the lens elements and deflectors in the experiment were developed over a number of years, and therefore take different forms. Three of these supplies feed the deflectors in the electron gun, the other two supply the input deflectors in the analysers. In a second 19" crate is located the gun lens high voltage supplies together with the high voltage supplies for the Faraday cup. In a third 19" crate is located the analyser voltage supplies together with a set of serial loading supplies that control the electron multiplier EHT supplies. A further supply controls the current boost circuitry located in the filament constant current supply unit (see below). The outputs of each computer controlled supply that drives an individual lens element or deflector are connected to a 70 relay switching board. The Digital voltmeter is in turn accessed via an IEEE-488 interface which is addressed by an 8086 slave PC which converses with the central PC which controls the experiment. The outputs from the relay board connect to the spectrometer via shielded multicore cables which take the gun voltages to the 52 way feedthrough and the analyser voltages to the two 19 way feedthroughs located on the vacuum flange. The gun supply multicore also carries the filament supply current to the 52 way feedthrough.
The Faraday cup current is measured by the Keithley Digital voltmeter when under computer control but this can also be measured by an external pico-ammeter. In addition to the analyser electrostatic lens and deflector voltage connections, the 19 way CF70 feedthroughs are used to control signals from internal sensing opto-isolators which control the stepper motor interlocks.
The stepper motors that drive the analysers and electron gun around the detection plane are five phase motors with integral 10X reduction gearboxes driving the rotary motion feedthroughs.
The intelligent stepper motor drivers are addressed via a serial port located on the controlling PC bus. An additional interference problem was traced to the RS232 serial line from the controlling PC. The PC bus was found to be poorly earthed due to very little copper being used for the bus earth. This was cured by decoupling the 0V RS232 line from the main 0V line for the stepper motors, as is shown in figure 10. The analyser stepper motor supplies have a facility for halting the motors using limit switches which are optically coupled to the internal 68000 logic circuits driving the supplies. The SD5443-3 phototransistor normally illuminated by the TEMT88PD photodiode during operation ensured a fail-safe mechanism should any of these components fail (this automatically prevent the motors from running). Should the analysers move into a position as defined by the four criteria (a) - (d) above, a shutter located on the analyser turntables moves between the appropriate photodiode and phototransistor, shutting off the light and thereby shutting down the stepper motor current. Only motion in the opposite direction is allowed by controlling logic, allowing the analyser to move away from the point of imminent collision but no closer. The six pairs of optocouplers that prevent the analysers moving into the Faraday cup, electron gun and gas jet support are located on the mounting struts supporting the main body of the spectrometer. Two optocouplers are located on the side of analyser 2, and two shutters are located on the sides of analyser 1 to prevent the analysers colliding with each other.
Finally a ninth optocoupler is located over the electron gun counterweight which monitors when the gun is at an angle less than 65A°, where the sweep angle around the detection plane is reduced. The current boost circuit operates from a serial driven supply card as detailed previously. The main filament drive is through six power diodes that feed the current from the constant current supply to the filament. The Darlington transistor T1 feeds additional current to the filament via three parallel 10 turn 100W trim resistors through a 1N4007 diode.
As the constant current supply acts as an infinite resistance source, the boost circuit supplies additional current only when the voltage at the anode of the feed 1N4007 exceeds the output voltage of the constant current supply.
Finally, the filament bias voltage (and hence energy of the electrons) is set to the midpoint of the filament by two 100W balancing resistors located across the terminals.
In addition to the ADC buffer card, three independent isolated regulated supplies drive REF01 voltage reference sources for measurement of the positions of 10 turn potentiometers located on the analyser and electron gun rotary drive shafts.
The angular position of the electron gun and analysers is calibrated when the system is opened using visible laser diodes that define these angles to an accuracy of A±0.2A°.
Figure 13 shows an overall block diagram detailing the computer control and high speed pulse interfacing to the spectrometer.
The NAACP bestows the annual Image Awards for achievement in the arts and entertainment, and the annual Spingarn Medals for outstanding positive achievement of any kind, on deserving black Americans. The NAACP's headquarters is in Baltimore, with additional regional offices in California, New York, Michigan, Colorado, Georgia, Texas and Maryland.[6] Each regional office is responsible for coordinating the efforts of state conferences in the states included in that region. In 1905, a group of thirty-two prominent African-American leaders met to discuss the challenges facing people of color and possible strategies and solutions.


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The Race Riot of 1908 in Abraham Lincoln's hometown of Springfield, Illinois, had highlighted the urgent need for an effective civil rights organization in the U.S. On May 30, 1909, the Niagara Movement conference took place at New York City's Henry Street Settlement House, from which an organization of more than 40 individuals emerged, calling itself the National Negro Committee. The conference resulted in a more influential and diverse organization, where the leadership was predominantly white and heavily Jewish American.
According to Pbs.org "Over the years Jews have also expressed empathy (capability to share and understand another's emotion and feelings) with the plight of Blacks.
As a member of the Princeton chapter of the NAACP, Albert Einstein corresponded with Du Bois, and in 1946 Einstein called racism "America's worst disease".[21][22] Du Bois continued to play a pivotal role in the organization and served as editor of the association's magazine, The Crisis, which had a circulation of more than 30,000. An African American drinks out of a segregated water cooler designated for "colored" patrons in 1939 at a streetcar terminal in Oklahoma City.
In its early years, the NAACP concentrated on using the courts to overturn the Jim Crow statutes that legalized racial segregation. The NAACP began to lead lawsuits targeting disfranchisement and racial segregation early in its history. In 1916, when the NAACP was just seven years old, chairman Joel Spingarn invited James Weldon Johnson to serve as field secretary. The NAACP devoted much of its energy during the interwar years to fighting the lynching of blacks throughout the United States by working for legislation, lobbying and educating the public. The NAACP also spent more than a decade seeking federal legislation against lynching, but Southern white Democrats voted as a block against it or used the filibuster in the Senate to block passage. In alliance with the American Federation of Labor, the NAACP led the successful fight to prevent the nomination of John Johnston Parker to the Supreme Court, based on his support for denying the vote to blacks and his anti-labor rulings. The organization also brought litigation to challenge the "white primary" system in the South. The board of directors of the NAACP created the Legal Defense Fund in 1939 specifically for tax purposes. With the rise of private corporate litigators like the NAACP to bear the expense, civil suits became the pattern in modern civil rights litigation. The NAACP's Baltimore chapter, under president Lillie Mae Carroll Jackson, challenged segregation in Maryland state professional schools by supporting the 1935 Murray v. Locals viewing the bomb-damaged home of Arthur Shores, NAACP attorney, Birmingham, Alabama, on September 5, 1963.
The campaign for desegregation culminated in a unanimous 1954 Supreme Court decision in Brown v. The State of Alabama responded by effectively barring the NAACP from operating within its borders because of its refusal to divulge a list of its members. New organizations such as the Southern Christian Leadership Conference (SCLC) and the Student Nonviolent Coordinating Committee (SNCC) rose up with different approaches to activism. The NAACP continued to use the Supreme Court's decision in Brown to press for desegregation of schools and public facilities throughout the country.
By the mid-1960s, the NAACP had regained some of its preeminence in the Civil Rights Movement by pressing for civil rights legislation. In 1993 the NAACP's Board of Directors narrowly selected Reverend Benjamin Chavis over Reverend Jesse Jackson to fill the position of Executive Director.
In 1996 Congressman Kweisi Mfume, a Democratic Congressman from Maryland and former head of the Congressional Black Caucus, was named the organization's president. In the second half of the 1990s, the organization restored its finances, permitting the NAACP National Voter Fund to launch a major get-out-the-vote offensive in the 2000 U.S. During the 2000 Presidential election, Lee Alcorn, president of the Dallas NAACP branch, criticized Al Gore's selection of Senator Joe Lieberman for his Vice-Presidential candidate because Lieberman was Jewish. Alcorn, who had been suspended three times in the previous five years for misconduct, subsequently resigned from the NAACP and started his own organization called the Coalition for the Advancement of Civil Rights. Alcorn's remarks were also condemned by the Reverend Jesse Jackson, Jewish groups and George W. The Internal Revenue Service informed the NAACP in October 2004 that it was investigating its tax-exempt status based on Julian Bond's speech at its 2004 Convention in which he criticized President George W. As the American LGBT rights movement gained steam after the Stonewall riots of 1969, the NAACP became increasingly affected by the movement to suppress or deny rights to lesbian, gay, bisexual and transgender people. This aspect of the NAACP came into existence in 1936 and now is made of over 600 groups and totaling over 30,000 individuals. In 2003, NAACP President and CEO, Kweisi Mfume, appointed Brandon Neal, the National Youth and College Division Director.[46] Currently, Stefanie L. Since 1978 the NAACP has sponsored the Afro-Academic, Cultural, Technological and Scientific Olympics (ACT-SO) program for high school youth around the United States. When right-wing media maven Andrew Breitbart publicized a maliciously edited video of a speech at a NAACP-sponsored Georgia event by USDA worker Shirley Sherrod, the mainstream press recycled his libel without properly vetting it, and the organization itself piled on without properly checking what had happened.[48] NAACP president and CEO has since apologized.
21.Jump up ^ Fred Jerome, Rodger Taylor (2006), Einstein on Race and Racism, Rutgers University Press, 2006. 22.Jump up ^ Warren Washington (2007), Odyssey in Climate Modeling, Global Warming, and Advising Five Presidents. 30.Jump up ^ AJCongress on Statement by NAACP Chapter Director on Lieberman, American Jewish Congress (AJC), August 9, 2000. 33.Jump up ^ "President Bush addresses the National Association for the Advancement of Colored People's (NAACP) national convention" (video). 37.Jump up ^ "Election Year Activities and the Prohibition on Political Campaign Intervention for Section 501(c)(3) Organizations". National Association for the Advancement of Colored People, Region 1 Photograph Collection, ca. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply.
In 1987, Bishop Zubik was appointed Administrative Secretary to then-Pittsburgh Bishop Anthony J. In 1995, he was named Associate General Secretary and Chancellor of the Diocese of Pittsburgh, and on January 1, 1996, became Vicar General and General Secretary—a position in which he served until his appointment to the Diocese of Green Bay.
Bishop Zubik was consecrated a bishop on April 6, 1997, at Saint Paul Cathedral and was appointed auxiliary bishop of the Diocese of Pittsburgh.
One of these is internally connected to a gas jet which can be set at 45A° to the incident electron beam and is used in the perpendicular plane experiments.
These stainless steel feeder tubes are connected to the nozzle using grounded shielded PTFE hose.
One follows the anode, another corrects the beam direction between the apertures and a third steers the beam onto the interaction region.
This shield is coated with aerodag colloidal graphite to reduce patch fields on the surface of the metal, and is made as small as possible to allow the analysers to approach the gun as close as is feasible when non-perpendicular plane geometries are selected (see figure 2). The XY translation table is mounted from the rotating yoke, to which is attached the photomultiplier tube. This allows the gun to be dismounted from the system without the need for rewiring of the feedthrough when the need arises (filament changes, cleaning etc). The wiring between the gun and inline socket is also shielded colour coded PTFE coated advance wire facilitating spot welding to the electrostatic lens elements of the gun. The analysers are mounted onto x-z translation tables that allow them to view the interaction region accurately over the full range of angles accessible.
These lenses have a capability for energy zooming of around 10 : 1, and have a maximum entrance acceptance angle of A±3A° as defined by the entrance apertures. This ensures that the overlap volume accepted by each analyser encompasses the interaction volume for all detection angles as the analysers move in the detection plane. These devices use an activated lead glass internal surface which has a high coefficient of secondary electron emission when a high voltage (around 3000V) is applied across the multiplier. This noise may be picked up by the channel electron multiplier and the high voltage feed to the multiplier, and is generated internally in the vacuum system.
The CFD's are operated in NaI mode as this has a 2ms dead time following the initial pulse, thus reducing the possibility of false triggering due to any mismatching impedance reflections along the delay cable. These EHT supplies are connected via VERO 200 high voltage couplings to high voltage cable connecting to the pickoff circuitry located on the high voltage feedthroughs.
This allowed the analysers to roam the detection plane over a complete 360A° angular range.
The configuration of the target source hypodermic when perpendicular plane measurements are conducted. The common procedure is to initially maximise the current from the gun onto the Faraday cup, then onto analyser counts as the electron beam is moved through the gas jet.
Maximising the Faraday cup current is therefore only a crude preliminary alignment of the incident electron gun beam.
This therefore assumes that the analysers are initially focused onto the interaction region, and a slow iterative technique must be adopted where the analysers and electron gun are tuned so as to maximise the signal from both analysers. In this case a true differential cross section is not obtained, since the scattered and ejected electron trajectories lie in a different plane than defined in the initial experimental alignment. An EMI 9789QB reduced photocathode photomultiplier tube is installed in the vacuum system together with optical focussing and defining elements (figure 2).
A group of these excited states decay back to lower valence states with the emission of visible photons at wavelengths around 450nm for both helium and argon targets. Tuning of the electron gun to PMT counts therefore guarantees that the electron gun is steered and focussed to the point at the centre of the detection plane independent of the analysers or gas beam density.
This is mainly used when the vacuum system is baked at temperatures above 55A°C, since the photocathode is rapidly damaged by temperatures exceeding this. The tube is a venetian blind dynode construction, and has a reduced photocathode to decrease the noise on the output of the tube to less than 20Hz.
The photomultiplier tube base was thoroughly cleaned in an ultrasound following location of these components, to displace any flux residue from the solder joints.
It is therefore necessary to amplify the channeltron pulses prior to transmission to the discriminators, whereas the photomultiplier tube pulses are sufficiently large to not require further amplification. These pulses are amplified by Phillips Scientific 6954 100X amplifiers located external to the EHT feedthroughs connected by 10cm lengths of RG-58 cable.
These crates are further decoupled from the AC mains supply using filter circuitry on each supply line.
Internal to these rate-meters buffer 7400 TTL chips have been added to send to 32 bit counters located in the main PC via RG-58 cable.
These supplies are fully floating, their mid-point voltage being equal to the lens element voltage in which the deflectors are housed.
All these supplies are fully computer controlled isolated units with low output impedance to reduce noise and eliminate current loops. This relay switching unit allows either the voltage or the current on each lens element to be measured by a Keithley Digital voltmeter. This drive is further reduced internally by 10X reduction gears, resulting in a reduction ratio of 100:1. This led to the ground line of the RS232 serial line moving around with respect to the 0V stepper motor reference as drive current to the motors returned along the ground line.
The optocoupler logic circuit circuit that controls the stepper motors and avoids collisions between the analysers, the electron gun, the Faraday cup and the hypodermic support. Added to this filament supply is a computer controlled current boost circuit that can be used to increase the filament current during electron gun tuning.
The additional current then returns to the 12V DC regulated supply via a second 1N4007 diode.
This therefore depends upon both the current driving the filament, as well as the resistance of the filament when hot (typically 4W - 6W).
This supply feeds current to the filament without changing the characteristics of the main constant current supply used while operating the spectrometer. These high stability reference sources ensure that the analyser and electron gun positions are accurately measured with time. A datalogger internal to the controlling PC establishes a cubic spline relationship between the measured angles and the corresponding ADC conversion from the potentiometers. This PC also controls the selection of the relay motherboard for measurement of the required lens element either in voltage or current mode when a request is sent from the controlling computer via an RS232 serial line.
The board elects one person as the president and one as chief executive officer for the organization; Benjamin Jealous is its most recent (and youngest) President, selected to replace Bruce S. Local chapters are supported by the 'Branch and Field Services' department and the 'Youth and College' department. They were particularly concerned by the Southern states' disfranchisement of blacks starting with Mississippi's passage of a new constitution in 1890. In fact, at its founding, the NAACP had only one African American on its executive board, Du Bois himself.
In the early 20th century, Jewish newspapers drew parallels between the Black movement out of the South and the Jews' escape from Egypt, pointing out that both Blacks and Jews lived in ghettos, and calling anti-Black riots in the South "pogroms". Storey was a long-time classical liberal and Grover Cleveland Democrat who advocated laissez-faire free markets, the gold standard, and anti-imperialism. In 1913, the NAACP organized opposition to President Woodrow Wilson's introduction of racial segregation into federal government policy, offices, and hiring. It was influential in winning the right of African Americans to serve as officers in World War I. Because of disfranchisement, there were no black representatives from the South in Congress. Southern states had created white-only primaries as another way of barring blacks from the political process.
The NAACP's Legal department, headed by Charles Hamilton Houston and Thurgood Marshall, undertook a campaign spanning several decades to bring about the reversal of the "separate but equal" doctrine announced by the Supreme Court's decision in Plessy v.


Board of Education that held state-sponsored segregation of elementary schools was unconstitutional.
These newer groups relied on direct action and mass mobilization to advance the rights of African Americans, rather than litigation and legislation. Daisy Bates, president of its Arkansas state chapter, spearheaded the campaign by the Little Rock Nine to integrate the public schools in Little Rock, Arkansas. Johnson worked hard to persuade Congress to pass a civil rights bill aimed at ending racial discrimination in employment, education and public accommodations, and succeeded in gaining passage in July 1964. The dismissal of two leading officials further added to the picture of an organization in deep crisis. A controversial figure, Chavis was ousted eighteen months later by the same board that had hired him. Three years later strained finances forced the organization to drastically cut its staff, from 250 in 1992 to just fifty. On a gospel talk radio show on station KHVN, Alcorn stated, "If we get a Jew person, then what I'm wondering is, I mean, what is this movement for, you know?
Bush (president from 2001–2009) declined an invitation to speak to its national convention.[31] The White House originally said the president had a schedule conflict with the NAACP convention,[32] slated for July 10–15, 2004.
Bond, while chairman of the NAACP, became an outspoken supporter of the rights of gays and lesbians, publicly stating his support for same-sex marriage. Barber, II of North Carolina participating actively against (the ultimately-successful) North Carolina Amendment 1 in 2012. The NAACP Youth & College Division is a branch of the NAACP in which youth are actively involved. The program is designed to recognize and award African American youth who demonstrate accomplishment in academics, technology, and the arts. Africana: The Encyclopedia of the African and African American Experience, in articles "Civil Rights Movement" by Patricia Sullivan (pp 441-455) and "National Association for the Advancement of Colored People" by Kate Tuttle (pp 1,388-1,391). Hooks, "Birth and Separation of the NAACP Legal Defense and Educational Fund," Crisis 1979 86(6): 218-220. Zubik was born September 4, 1949, in Sewickley, Pennsylvania, to Stanley and the late Susan (Raskosky) Zubik. The spectrometer is shown configured in the perpendicular plane, the electron gun being placed in the vertical position with respect to the analysers which span the horizontal detection plane. The electron source is a heated tungsten hairpin filament heated by passing around 2A of DC current through the filament.
The saturated gain of these devices yields around 1E8 electrons in the output current pulse for a single electron which enters the input cone.
This allows the analyser to roam over a complete 360 degrees of the detection plane when in this geometry (apart from the position where the analysers would clash wth each other). The analysers are then adjusted for maximum signal count and the procedure is iterated until a maximum is found. The dark noise count is also reduced when cooled, however since the reduced cathode PMT only produces dark counts of less than 20Hz at room temperature, this is not necessary during routine operations.
The 1.82M resistor was chosen to optimise the single photon counting efficiency of the tube. It is not found that these solder connections significantly affect the ultimate vacuum pressure in the system. Isolated DC supplies to these amplifiers is obtained from a standard +15V supply, the circuit diagram being given in figure 8. The power supply to these TTL buffers is derived from the rate-meter supplies via 7805 5V regulators located internally. This supply boosts the current without changing the main supply, thus ensuring supply stability before and after the electron gun is tuned. The 'Legal' department focuses on court cases of broad application to minorities, such as systematic discrimination in employment, government, or education. Through the early 1900s, legislatures dominated by white Democrats ratified new constitutions and laws creating barriers to voter registration and more complex election rules.
Mary White Ovington, journalist William English Walling and Henry Moskowitz met in New York City in January 1909 and the NAACP was born.[14] Solicitations for support went out to more than 60 prominent Americans, and a meeting date was set for February 12, 1909.
It did not elect a black president until 1975, although executive directors had been African-American. Storey consistently and aggressively championed civil rights, not only for blacks but also for Native Americans and immigrants (he opposed immigration restrictions). Six hundred African-American officers were commissioned and 700,000 men registered for the draft.
United States (1915) to Oklahoma's discriminatory grandfather clause that disfranchised most black citizens while exempting many whites from certain voter registration requirements. The NAACP regularly displayed a black flag stating "A Man Was Lynched Yesterday" from the window of its offices in New York to mark each lynching. The NAACP lost most of the internecine battles with the Communist Party and International Labor Defense over the control of those cases and the strategy to be pursued in that case.
Since southern states were dominated by the Democrats, the primaries were the only competitive contests. Intimidated by the Department of the Treasury and the Internal Revenue Service, the Legal and Educational Defense Fund, Inc., became a separate legal entity in 1957, although it was clear that it was to operate in accordance with NAACP policy.
He followed that with passage of the Voting Rights Act of 1965, which provided for protection of the franchise, with a role for federal oversight and administrators in places where voter turnout was historically low. Benjamin Hooks, a lawyer and clergyman, was elected as the NAACP's executive director in 1977, after the retirement of Roy Wilkins. They accused him of using NAACP funds for an out-of-court settlement in a sexual harassment lawsuit.[26] Following the dismissal of Chavis, Myrlie Evers-Williams narrowly defeated NAACP chairperson William Gibson for president in 1995, after Gibson was accused of overspending and mismanagement of the organization's funds. Large amounts of money are being given to them by large corporations that I have a problem with."[27] Alcorn also said, "I cannot be bought. Jackson said he strongly supported Lieberman's addition to the Democratic ticket, saying, "When we live our faith, we live under the law.
On July 10, 2004, however, Bush's spokesperson said that Bush had declined the invitation to speak to the NAACP because of harsh statements about him by its leaders.[32] In an interview, Bush said, "I would describe my relationship with the current leadership as basically nonexistent. Most notably he boycotted the 2004 funeral services for Coretta Scott King on the grounds that the King children had chosen an anti-gay megachurch.
The Youth Council is composed of hundreds of state, county, high school and college operations where youth (and college students) volunteer to share their voices or opinions with their peers and address issues that are local and national. A graduate and former Student Government President at Howard University, Stefanie previously served as the National Youth Council Coordinator of the NAACP. Local chapters sponsor competitions in various categories of achievement for young people in grades 9–12. Crafting Law in the Second Reconstruction: Julius Chambers, the NAACP Legal Defense Fund, and Title VII. The National Association for the Advancement of Colored People: A Case Study in Pressure Groups.
Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. He attended Saint Stanislaus Elementary School and Saint Veronica High School, both in Ambridge, before entering Saint Paul Seminary in Pittsburgh. In 1988, he was appointed Administrative Secretary and Master of Ceremonies to then-Pittsburgh Bishop Donald W.
The electron gun is a two stage non-energy selected gun that produces an incident electron beam current of up to 4 microamps at an incident energy from around 30eV to 300eV. The 470k resistors bias the dynodes to achieve saturation of the current pulse at the output of the tube, hence biasing the tube for single photon counting applications. This was found to be necessary to eliminate problems associated with current loops from the 20A peak motor current feeding the common point of the logic circuitry.
This was intended to coincide with the 100th anniversary of the birth of President Abraham Lincoln, who emancipated enslaved African Americans.
Jews made substantial financial contributions to many civil rights organizations, including the NAACP, the Urban League, the Congress of Racial Equality, and the Student Nonviolent Coordinating Committee. The following year, the NAACP organized a nationwide protest, with marches in numerous cities, against D.
Within four years, Johnson was instrumental in increasing the NAACP's membership from 9,000 to almost 90,000. More than 200 black tenant farmers were killed by roving white vigilantes and federal troops after a deputy sheriff's attack on a union meeting of sharecroppers left one white man dead. Starting on December 5, 1955, NAACP activists, including Edgar Nixon, its local president, and Rosa Parks, who had served as the chapter's Secretary, helped organize a bus boycott in Montgomery, Alabama.
He [Lieberman] is a firewall of exemplary behavior."[27] Al Sharpton, another prominent African-American leader, said, "The appointment of Mr. Winners of the local competitions are eligible to proceed to the national event at a convention held each summer at locations around the United States. He received an undergraduate degree at Duquesne University in 1971 and went on to study at Saint Mary Seminary and University in Baltimore, Maryland, where he earned a degree in theology in 1975.
He was then assigned as Vice Principal of Quigley Catholic High School in Baden as well as Chaplain to the Sisters of Saint Joseph Motherhouse and Chaplain to the students at Mount Gallitzin Academy. Wuerl (now Cardinal Archbishop of Washington, DC), where he served until 1991, when he began his service as Director of Clergy Personnel. The analysers are identical, and consist of a 3-element electrostatic lens focussing the interaction region onto the entrance of a hemispherical electrostatic energy analyser. The Anode deflector pair corrects for any misalignment of the filament emission point with respect to the axis of the electron gun. Men who had been voting for thirty years in the South were told they did not "qualify" to register. Walling, social worker Mary White Ovington, and social worker Henry Moskowitz, then Associate Leader of the New York Society for Ethical Culture. While the meeting did not take place until three months later, this date is often cited as the founding date of the organization. Jewish historian Howard Sachar writes in his book A History of Jews in America of how, "In 1914, Professor Emeritus Joel Spingarn of Columbia University became chairman of the NAACP and recruited for its board such Jewish leaders as Jacob Schiff, Jacob Billikopf, and Rabbi Stephen Wise."[19] Early Jewish-American co-founders included Julius Rosenwald, Lillian Wald, Rabbi Emil G. Warley in 1917 that state and local governments cannot officially segregate African Americans into separate residential districts.
White published his report on the riot in the Chicago Daily News.[23] The NAACP organized the appeals for twelve black men sentenced to death a month later based on the fact that testimony used in their convictions was obtained by beatings and electric shocks. This was designed to protest segregation on the city's buses, two-thirds of whose riders were black.
449 (1958), the NAACP lost its leadership role in the Civil Rights Movement while it was barred from Alabama. Committing to the Youth Council may reward young people with travel opportunities or scholarships.
At the same time, he began graduate studies at Duquesne University where he earned a master’s degree in education administration in 1982. The Chamber is lined internally with 3mm thick mu-metal, and a mu-metal cylinder encloses the chamber externally as shown. The electrons selected in angle and energy are amplified using Mullard 919BL channel electron multipliers.
The defining apertures limit the pencil and beam angles of the electron beam following focussing by lens 2 onto the interaction region. The load is set by the 50W resistor across the anode to the HT feed, the pulse being decoupled to ground via the 1nF capacitor. The goal of the Health Division is to advance health care for minorities through public policy initiatives and education.
The Court's opinion reflected the jurisprudence of property rights and freedom of contract as embodied in the earlier precedent it established in Lochner v. Over the next ten years, the NAACP escalated its lobbying and litigation efforts, becoming internationally known for its advocacy of equal rights and equal protection for the "American Negro". Although states had to retract legislation related to the white primaries, the legislatures soon came up with new methods to limit the franchise for blacks.
He served in the role of adjunct spiritual director at Saint Paul Seminary from 1984 through 1991 and associate spiritual director at Saint Vincent Seminary, Latrobe, from 1989 through 1996. This reduces the magnetic field at the interaction region to less than 5mG, an acceptable level for the electron energies used in this experiment. The interaction region defined by the interaction of the gas target beam and the electron beam is focussed onto the photocathode of an EMI 9789QB photomultiplier tube via a lens, 450nmA±50nm optical filter and defining aperture. Placement of the apertures ensures that the beam angle is close to zero degrees at the interaction region over a wide range of energies, whereas the aperture opening reduces the pencil angle to around A±2 degrees over this energy range. The target gas effuses from a 0.6mm ID hypodermic needle constructed from platinum iridium alloy. The 10MW safety resistor prevents the output charging up to a high voltage if the feed is disconnected. The deflectors between the apertures correct for space and surface charge beam variations inside the field free region, whereas the final deflectors allow the beam to be steered onto the interaction region defined by focussing a 1mm aperture in front of the photomultiplier tube onto the gas target beam.
86 (1923) that significantly expanded the Federal courts' oversight of the states' criminal justice systems in the years to come. The electrons passing through the interaction region which are not scattered are collected in a Faraday cup opposite the electron gun.
The gun, photomultiplier tube, gas hypodermic and Faraday cup all rotate on a common yoke with an axis through the centre of the horizontal detection plane, allowing all geometries from the perpendicular plane to the coplanar geometry to be accessed.




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