Question: Ulrich Walter and Mirosław Hermaszewski were both astronauts, which one was also a german physicist and engineer?

Context paragraphs:
Mirosław Hermaszewski: Mirosław Hermaszewski (born September 15, 1941) is a retired Polish Air Force officer and cosmonaut.  He became the first (and to this day remains the only) Polish national in space, when he flew aboard the Soviet Soyuz 30 spacecraft in 1978.

Franz–Keldysh effect: The Franz–Keldysh effect is a change in optical absorption by a semiconductor when an electric field is applied.  The effect is named after the German physicist Walter Franz and Russian physicist Leonid Keldysh (nephew of Mstislav Keldysh).

Einstein on the Lake: Einstein on the Lake is a novel by German physicist Ulrich Woelk.

Wally Schirra: Walter Marty "Wally" Schirra Jr. (March 12, 1923 – May 3, 2007), (CAPT, USN), was an American naval officer and aviator, aeronautical engineer, test pilot, and one of the original seven astronauts chosen for Project Mercury, United States first effort to put humans in space.  He flew the six-orbit, nine-hour Mercury-Atlas 8 mission on October 3, 1962, becoming the fifth American, and the ninth human, to ride a rocket into space.  In the two-man Gemini program, he achieved the first space rendezvous, station-keeping his Gemini 6A spacecraft within 1 ft of the sister Gemini 7 spacecraft in December 1965.  In October 1968, he commanded Apollo 7, an 11-day low Earth orbit shakedown test of the three-man Apollo Command/Service Module.  He was the first person to go into space three times, and the only person to have flown in Mercury, Gemini, and Apollo, logging a total of 295 hours and 15 minutes in space.  He retired from the U.S. Navy at the rank of Captain and from NASA after his Apollo flight, becoming a consultant to CBS News for its coverage of the subsequent Apollo flights.  He joined Walter Cronkite as co-anchor for the seven Moon landing missions.

Walter Dröscher: Walter Dröscher is a physicist who worked at the Austrian Patent office (Österreichisches Patentamt) .  Now in retirement, he devotes most of his time to developing Heim Theory.  It was in 1980 that Dröscher was introduced to the reclusive German physicist Burkhard Heim, thereby becoming one of the few physicists to collaborate with Heim.

Ulrich of Hardegg: Ulrich of Hardegg (German: "Ulrich von Hardegg" or "Ulrich von Hardeck" or "Ulrich zu Hardegg auf Glatz und im Marchlande" ; after 1483 – 1535) was an Austrian nobleman from the Prüschenk family of Count of Hardegg.  He was "Cup-bearer" of Austria, which, by this time, was a title of nobility and no longer involved looking after the arch-duke's wine cellar.  He was also steward in Styria.

Ulrich Walter: Prof. Dr. Ulrich Hans Walter (born February 9, 1954) is a German physicist/engineer and a former DFVLR astronaut.

Kelvin–Voigt material: A Kelvin–Voigt material, also called a Voigt material, is a viscoelastic material having the properties both of elasticity and viscosity.  It is named after the British physicist and engineer Lord Kelvin and after German physicist Woldemar Voigt.

Invention of the integrated circuit: The idea of integrating electronic circuits into a single device was born when the German physicist and engineer developed and patented the first known integrated transistor amplifier in 1949 and the British radio engineer Geoffrey Dummer proposed to integrate a variety of standard electronic components in a monolithic semiconductor crystal in 1952.  A year later, Harwick Johnson filed a patent for a prototype integrated circuit (IC).

Walter Masing: Walter Masing (born 22 June 1915 in Petrograd — died 29 March 2004 in Erbach) was a German physicist and honorary president of the German Association for Quality.  He promoted and sponsored the settlement of quality management in Germany.

Supporting paragraphs: Ulrich Walter Mirosław Hermaszewski
Answer: Ulrich