1. The balloons had been inflated with helium.

2. He inflated the balloons with helium.

3. Atoms of hydrogen are fused to make helium.

4. Helium and neon are inert gases.

5. Helium is a very light gas.

6. It's a helium filled balloon with a kite attached.

7. We inflated the balloons with helium.

8. This helium produced by radioactive decay, called radiogenic helium, consists of pure 4He.

9. The helium would seep up through fissures, and hence its natural occurrence near the hot springs.

10. I could see a silver helium airship over the city centre.

11. Inert gases such as helium have zero valencies. they do not normally form compounds.

12. The two orbiting electrons of the helium atom form a shell.

13. These solar gases contain a large amount of helium(), the second most abundant element in the Sun.

14. The high abundances of hydrogen and helium are features of the giant planets also.

15. Helium was used over the fuel to maintain a constant pressure in the tank both at launch and during flight.

16. It is burning hydrogen into helium, like a controlled H-bomb.

17. Obviously there is a price to be paid in holding the liquid helium temperatures.

18. As with the service propulsion system, the propellants were force-fed to the engine by pressurized helium from a storage tank.

19. Visual effects feature largely in this community arts venture, and have included helium balloons and fireworks.

20. In any plausible way of forming Jupiter the hydrogen and helium are initially well mixed at a molecular level.

21. The job is made more difficult now because of self-sealing materials and the use of helium.

22. Uranium has two radioactive isotopes, each of which decays to an isotope of lead and helium.

23. Typically, the fuels are isotopes of the three lightest elements, hydrogen, helium, and lithium.

24. People left the auditorium that morning trailing their doubts behind them like children dragging exhausted helium balloons.

25. Methane condenses to form a cloud layer above the ammonia clouds, leaving a gas that is almost entirely hydrogen and helium.

26. The Paneth and Peters work was his speciality and he was enthused by the fact that some helium had apparently been found.

26. try its best to collect and create good sentences.

27. And the recently discovered structure of atoms gave them the idea that they could make helium out of hydrogen.

28. This again raises the temperature and pressure, until the thermonuclear burning of helium to carbon is ignited.

29. However, the story can be simplified without losing its essence by neglecting the helium for the time being.

30. These micro-refrigerators are commercially available, and avoid the explosion hazard of liquid hydrogen and the expense of liquid helium.

1. The balloons had been inflated with helium.

2. He inflated the balloons with helium.

31. Supplies of liquid helium are an absolute necessity in many modern science laboratories.

32. The helium in his gas mixture fried his nervous system.

33. I wish people would stop buying helium balloons and letting them go.

34. A second problem emerged with the need to construct lightweight vessels to contain the recently discovered gas helium.

35. Breastfeeding does perky things to some women's statistics, but it left mine looking like two well-past-their-sell-by-date helium balloons.

36. Helium is also made by radioactive decay of uranium and thorium, both of which decay by emission of alpha particles.

37. The Kamikaze: One part liquid helium, two parts prussic acid.

38. Helium, the next element in the periodic table, contains two electrons encircling a nucleus containing two protons.

39. Kulcinski argues that the solar wind has implanted great quantities of hydrogen and helium into the lunar regolith.

40. Indeed, only one known substance is harder to liquefy than hydrogen: helium gas.

41. Both materials were removed in a 550-torr helium arc discharge sustained by 28 V at 70 amps d.c.

42. The helium atom without its electrons is known as an alpha particle, and is therefore positively charged.

43. But in addition there remained the puzzle of how the helium came to be in the springs.

44. Clearly, helium has the least polarizable electron cloud.

45. Helium is a gas used in balloons.

46. Helium and argon are monatomic gases.

47. Helium gas was the thermometric fluid.

48. A fountain of helium spurt out of the tube.

49. Helium is a monatomic chemically inert gas.

50. Helium is a noble gas.

51. The first type discovered -- alpha decay -- is when a radioactive particle emits a Helium nucleus !

52. Upon gaining two electrons alpha particle becomes a helium atom.

53. The paper introduces the helium turbine which used in helium refrigerator of space environment simulator, including its design, setting-to-work test and its characteristics.

54. The dynamic simulation result also indicates that the trial-run scheme of helium refrigerator can be optimized and the debugging cost and time can be saved though dynamic simulation.

55. A synthetic element produced in trace quantities by helium isotope bombardment of curium.

56. Its lightweight design enables it to "swim" in the sea of air using the lift from the helium in a similar way to the manta ray in water.

57. The Apollo Lunar Excursion Module Descent Engine (LMDE) is helium pressure-fed with the throttling ratio of 10:1 and a multi-startup capability.

58. Variational and Semi - classical Methods. Ground state and first excited state of helium,[http:///helium.html] via the variational method.

59. Helium ion microscopy (HIM) offers the highest spatial resolution surface imaging of any scanning beam method, as well as extremely high surface sensitivity.

60. In September 1999, this dramatic and detailed image was recorded by the EIT experiment on board the space-based SOHO observatory in the light emitted by ionized Helium.

61. If appropriate helium leak test plan is selected, it will be of benefit to improving detectability and effectively secure titanium vessel safety and reliability.

62. And there he was able to identify the alpha particle as the helium nucleus.

63. It provided a theoretical basis for further research about the cryoadsorption in the interzone temperature of liquid helium and designing and developing a cryopump used in NBI.

64. In this paper the design of surplus payload of aerostat is presented, based on calculation analysis of helium gas service engineering.

65. With these equations we have designed for helium-cadmium lasers a new type of helium replenisher, which has lengthened the life time of a He-Cd laser to over 1000 hours so far.

66. The helium - 3 apparently became trapped when the earth was formed.

67. J_T valve is commonly used in the last cooling stage of a helium refrigerator.

68. As a seal test, sensitivity of helium leak test is higher than other test methods as gas seal and NH3 leak test.

69. The nonrigid helium - filled Blimp was principally developed by Alberto Santos - Dumont ( 1873 - 1932 ) .

70. The superconducting cable, with its cooling line in the magnet cryostat, and the supply and return helium cooling lines will deform due to contraction at low temperature.

71. Small totally enclosed helium compressor is a componend equipment of G-M refrigerator. It is widely used in space environment simulation equipments, vacuum cryopump and vacuum coating equipments etc.

72. The deuteron can fuse with another proton to make a helium 3 nucleus.

73. A pulse appears in the half cycle of current in uniform glow discharge of helium and argon.

74. Since helium is nonflammable, special fire fighting equipment and instructions are not needed.

75. A carrier gas filter system is recommended to be installed on the Helium line ( He ) .

76. In helium gas of 37 Torr, particles with diameter of 100A were obtained. X-ray diffraction presents the pattern analogous to amorphous state.

77. It stands to reason that as supplies diminish, helium will be used more efficiently and investments in recycling technologies will grow.

78. A new method employing model FTV2700 helium ionized gas chromatographic analyzer to analyze the hexafluoroethane(C 2F 6)content in xenon is described.

79. After about 500 million years, the ionized helium in the quasars cooled and slowed enough that dwarf galaxies could begin bulking up again.

80. The working principles and the fundamental technical features of IP-1 ion pump helium detector are discussed.

81. The variation of the hyperfine interaction parameters and the variable mechanism of the sky-green glaze at liquid helium temperature is studied.

82. Another work of this thesis is numerical simulation of overlapped guide - plate stability for helium sub - cooling jacket.

83. Deuterium containing helium absorption of unsaturated uranium deuteride with different composition at varied initial pressure is studied.

84. Being both lighter than air and nonflammable, helium is used to inflate balloons and airships.

85. In 1999 September, this dramatic and detailed image was recorded by the EIT experiment on board the space-based SOHO observatory in the light emitted by ionized Helium.

86. This SIS mixer receiver is reliable,[] and can achieve good noise performance even operated at 4.3K temperature with a close cycle helium refrigerator.

87. It is the product of radioactive decay ( see radioactivity ) and is used in helium dating.

88. In the effect of mining, the release of hydrogen and helium changes abnormally, The helium has steady chemical property and strong diffusibility as well as penetrability.

89. MINIMAM UTILITIES: Air-cooled small X-ray tube and gas filled proportional counter have been employed, and the only requirements are AC Power Source and Helium Gas.

90. The stability of a liquid helium free superconducting magnet could be analyzed using the adiabatic stability criterion because there is no cryogen in the system.

91. Finally, an appropriate throttle valve was chose to serve the superfluid helium system.

92. Lockheed Martin's Persistent Threat Detection System is a tethered aerostat filled with helium designed to stay aloft for long periods of time to provide surveillance of broad areas.

93. Another team, ASACUSA, is studying exotic helium atoms in which one electron is replaced by an antiproton.

94. He also invented the Skyhook, an air rescue system that involved an airplane and a large helium balloon.

95. Objective To discuss the therapeutic value of low energy helium neon laser in hyperviscosity syndrome.

96. The High Temperature Gas-cooled Reactor (HTGR) and external-combustion heat engine firing with non-traditional fuel bring Brayton-cycle helium turbine a very good prospect.

97. After liquid - helium test we find that helium permeability is an important factor for FRP liquid - helium dewar.

98. This design reduces heat leak and vaporization of liquid helium during transportation.

99. That simplest fusion reaction, four hydrogens into one helium, works for turning a ball of gas like the Sun, 865,000 miles across, into a shining star.

100. When a star similar to the sun fuses most of its hydrogen into helium, then the helium into carbon, the star becomes unstable and puffs out into a red giant.

101. After researched with LPC algorithm, A Line Spectrum Pair (LSP) Based Algorithm for Helium Speech Enhancement is proposed in this paper.

102. The moon's lunar soil is chock-full of helium reserves, thanks to the solar wind.

103. Objective To discuss the application of CT fluoroscopy ( CTF ) in argon - helium targeting cryoablation advanced lung malignant tumor.

104. Under the same discharge conditions, the numbers of current pulses per half cycle for helium discharge are more than that for argon discharge.

105. The discharge properties in a hollow-cathode tube filled with gas are measured and the wavelength for Helium discharge is obtained.

106. He plans to circumnavigate the world in a helium balloon.

107. Being odorless, colorless, tasteless, and non - irritating, helium has no warning properties.

108. A dense core of incandescent helium is surrounded by a thin shell of hot, fusing hydrogen.

109. This paper reviews two dimensional electron gas formed on the liquid helium surface, the semiconductor surface space charge layer and the compound semiconductor heterojunction interface.

110. J - T loop is precooled by two - stage pulse tube cryocooler in order to obtain liquid helium temperature.

111. Both were by Ernest Rutherford, who had won the 1908 Nobel Prize in Chemistry in part for his discovery of the alpha particle, which he later proved was the nucleus of a helium atom.

112. Because Helium is used as coolant in High Temperature Gas-cooled Reactor (HTGR), the change of tribological properties of HTGR structure component under Helium is a big problem.

113. If a red giant is big enough (has sufficient mass), once it runs out helium it will move on to fusing other elements.

114. The modular high temperature gas-cooled reactor (HTGR) incorporated with helium turbine is considered as one of the leading candidates for future nuclear power plants.

115. Upon gaining two electrons the alpha particle becomes a helium atom.

116. The Sudbury fullerenes contained helium with compositions similar to some meteorites and cosmic dust.

116. is a sentence dictionary, on which you can find excellent sentences for a large number of words.

117. Hydrogen atoms are more abundant than either helium or oxygen but their low mass means they are easily swept aside by the high-speed solar wind and can't readily be detected.

118. Much of their explosive power comes from fusing together hydrogen atoms to form heavier helium atoms, which releases far more energy than a fission bomb.

119. In this paper, the performance of the airtightness for vacuum coating equipment, the characteristics of leak detection with Helium Mass-spectrometer and the leak detection system are described.

120. Noble gas( or inert gas ):Any of the six chemical elements that make up the rightmost group of the periodic table as usually arranged: helium, neon, argon, krypton, xenon, and radon.

121. The discovery also explains why helium is found in radioactive mineral deposits.

122. The cryogenic ground support equipment (CGSE) is used to cool down the second stage alpha magnetic spectrometer ANS02 magnet and to fill the superfluid helium into the magnetic Dewar of AMS02.

123. Alpha particles -- helium nuclei -- were being hurled through the tube, in which an artificial mist had been created.

124. Helium can provide a protective atmosphere in the production of reactive metals, such as titanium and zirconium.

125. The feasibility of using quadropole mass spectroscopy to differentiate helium and deuterium was discussed.

126. Nuclear fusion has created helium, carbon and other chemical elements.

127. Active magnetic bearings are important parts of helium turbines in the high temperature gas-cooled reactor(HTGR) power conversion unit.

128. The advanced leakage test technology of helium leakage test can't be extensively spreaded, due to low efficiency, high cost of the existing leakage test.

129. The helium mass spectrometer leak detecting technology for a large vacuum chamber with the complex construction is described. Some problems in operation are shown and analyzed.

130. Alpha particles positively charged helium nuclei obtained from natural radioactive decay.

131. One safety catch in his design is its helium coolant.

132. When a sunlike star exhausts its hydrogen fuel and then its helium, it turns to its carbon and oxygen.

133. As a kind of excellent cryogen with superconductivity, liquid helium of high purity has been widely used in many fields, such as industry and aerospace .

134. The image was recorded in extreme ultraviolet light emitted by ionized Helium, an element originally identified in the solar spectrum.

135. Helium and neon measurements provide further evidence that the earth was not completely melted.

136. Although helium is nontoxic and inert, it can act as a simple asphyxiant by displacing the oxygen in air to levels below that required to support life.

137. The parade was suspended from 1942 to 1944 because rubber and helium were needed for World War II, making this parade the 85th.

138. Gaseous helium is used as an inert shielding gas in metal arc and laser welding.

139. Objective To observe the efficacy of helium neon laser in preventing chemical phlebitis.

140. Any of the six chemical elements that make up the rightmost group of the periodic table as usually arranged: helium, neon, argon, krypton, xenon, and radon.

141. To do that, the instruments are positioned on top of a tank filled with superfluid liquid helium.

142. He tied them to a lawn chair and filled them with helium.

143. Gaseous helium is inert, colorless, odorless, non corrosive, and nonflammable.

144. The helium purification system of the Helium Test Loop was constructed for demonstrating test of the High Temperature Gas-cooled Reactor.

145. Some of this energy congealed into particles, which assembled into light atoms like hydrogen and helium.

146. The bizarre behavior of superfluid helium has attracted many able theorists.

146.

147. A nonrigid, buoyant airship. Modern blimps use helium instead of hydrogen to maintain buoyancy.

148. An experimental study on a two-stage G-M refrigerator operating in the liquid helium temperature region with the cold regenerator outside of the displacer has been studied.

149. After hydrogen, the atom with the simplest structure is that of helium.

150. Determination of true relative density of coal by helium replacement method was researched in this paper.

151. Unlike helium - 4, it cannot be produced by radioactive decay.

152. If specified by the design document, halogen, helium, alkaline air or other method is adopted for gas leakage test, special technical specification shall be duly followed.

153. They would form helium and a subatomic particle, called a neutron.

154. Performs Helium leak test of gas controlling system with complex manifolds.

155. Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.

156. The image was captured using four narrow-band filters that have been tuned to see hydrogen as well as ionized helium, sulfur and oxygen.

157. This Paper discusses the method for uranium exploration based on the analysis of helium in water leaching soil samples using ion pump helium detector.

158. The transformation of the formant central frequency and bandwidth is the main causation cause the Helium speech.

159. Hydrogen might be depleted with some of it turning into helium.