1,828 research outputs found
Letter from Ralph H. Cameron to Carl Hayden
No full textLetter from Ralph H. Cameron asking to speak to Carl Hayden concerning a matter relevant to the bill granting National Park status to the Grand Canyon
Letter from Carl Hayden to Ralph H. Cameron
No full textLetter from Carl Hayden to Ralph H. Cameron responding favorably to a request to meet in regards to the bill granting National Park status to the Grand Canyon
Letter from Ralph H. Cameron to Carl Hayden
No full textLetter from Ralph H. Cameron to Carl Hayden requesting a delay on the introduction of the Grand Canyon bill until he can meet with himself and Senator Ashurst in Washington
Letter from Ralph H. Cameron to Carl Hayden
No full textLetter from Ralph H. Cameron to Carl Hayden thanking him for forwarding Senate Bill No. 390 with the report of March 31st, 1918, and expressing interest in their upcoming meeting in Washington
Deformation density studies of ring systems. 2. The deformation density of the diazirine ring in the X-ray structure of 3-[(p-Nitrophenoxy) methyl]-3-chlorodiazirine
No full textThe crystal structure and electron density of 3-[(p-nitrophenoxy)methyl]-3-chlorodiazirine have been analyzed using single crystal X-ray diffraction at 208 K with Mo K alpha radiation to a resolution of sin(theta(max))/lambda = 1.126 Angstrom(-1). A total of 10 440 measured reflections gave 7742 unique reflections with R(m) = 0.026. A multipole atomic density model was fitted to these reflections to give an R(F) = 0.0311. The deformation density of the phenyl portion of the compound is as expected. The dynamic deformation density of the diazirine ring, however, suggests that the bonding in the three-membered ring is a combination of the classical severely-strained cr bonding system with a significant contribution of a a donation from the N=N to an sp(2) carbon. This observation is placed in the context of similar proposals for the bonding in cyclopropanes.PT: J; CR: ALLEN FH, 1987, J CHEM SOC PERK T 2, S1 BAERT F, 1982, ACTA CRYSTALLOGR A, V38, P143 BATTAGLIA R, 1980, Z NATURFORSCH B, V35, P719 BLESSING R, ACA T, P26 CAMERON TS, 1992, J AM CHEM SOC, V114, P1889 CAMERON TS, 1994, J AM CHEM SOC, V116, P1211 CREMER D, 1985, J AM CHEM SOC, V107, P3800 CREMER D, 1985, J AM CHEM SOC, V107, P3811 DEWAR MJS, 1979, J AM CHEM SOC, V101, P783 DOMENICANO A, 1975, ACTA CRYSTALLOGR B, V31, P221 DUNITZ JD, 1983, HELV CHIM ACTA, V66, P123 HANSEN NK, 1978, ACTA CRYSTALLOGR A, V34, P909 HIRSHFELD FL, 1991, CRYST REV, V2, P169 LINDEN A, 1988, J ORG CHEM, V53, P1085 LIU MTH, 1986, J CHEM SOC PERK T 2, P211 SCHMIDT MW, 1990, QCPE B, V10, P52 SEILER P, 1988, HELV CHIM ACTA, V71, P2100 SMITH VH, 1977, ISRAEL J CHEM, V16, P87 SOUHASSOU M, 1992, J AM CHEM SOC, V114, P2371 STEINER T, 1993, ACTA CRYSTALLOGR A, V49, P379 STEVENS IDR, 1990, J CHEM SOC P2, P661 STEWART RF, 1969, J CHEM PHYS, V51, P4569 WALSH AD, 1949, T FARADAY SOC, V45, P179 WIBERG KB, 1987, J AM CHEM SOC, V109, P985; NR: 24; TC: 4; J9: J AMER CHEM SOC; PG: 7; GA: NV421Source type: Electronic(1
Preparation and crystal structure of 3-(1-naphthylmethyl)-3-chlorodiazirine
No full textPT: J; CR: 1974, INT TABLES XRAY CRYS, V4 BATTAGLIA R, 1980, Z NATURFORSCH B, V35, P719 CAMERON TS, 1979, ACTA CRYSTALLOGR B, V35, P749 GERMAIN G, 1971, ACTA CRYSTALLOGR A, V27, P368 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 HEINE HW, 1983, SMALL RING HETEROCYC, V2, P547 HENCHER JL, 1967, J AM CHEM SOC, V89, P5527 KISCH H, 1987, CHEM DIAZIRINES, CH10 LIU MTH, 1982, CHEM SOC REV, V11, P127 MOFFAT JB, 1978, CHEM DIAZONIUM DIA 1 PIERCE L, 1962, J AM CHEM SOC, V84, P2651 SCHARPEN LH, 1969, J CHEM PHYS, V50, P2063 SCHMITZ E, 1979, ADV HETEROCYCL CHEM, V24, P63 SHELDRICK GM, 1976, SHELX 76 PROGRAM CRY WOLLRAB JE, 1968, J CHEM PHYS, V49, P2405 WOLLRAB JE, 1969, J CHEM PHYS, V51, P1585 WOLLRAB JE, 1970, J CHEM PHYS, V53, P1543; NR: 17; TC: 11; J9: J ORG CHEM; PG: 3; GA: M3719Source type: Electronic(1
Redescription of Troticus ovalis (Fahringer) comb. nov., its first host record and a note on T. melamopterus Cameron (Hymenoptera: Braconidae: Agathidinae)
No full textDisophrys ovalis Fahringer, 1937 (Hymenoptera: Braconidae: Agathidinae) from Egypt is redescribed and transferred to the genus Troticus Brullé, 1846 (comb. nov.) with Disophrys aegyptiaca Fahringer, 1937, as its junior synonym (syn. nov.). For the first time a reliable host record for the genus and for T. ovalis is given. The holotype of Troticus melamopterus Cameron, 1903 has been examined by the first author and is transferred to the genus Cremnops Foerster, 1862 (C. melamopterus Cameron, 1903 comb. nov.)
Redescription of Troticus ovalis (Fahringer) comb. nov., its first host record and a note on T. melamopterus Cameron (Hymenoptera: Braconidae: Agathidinae)
No full textDisophrys ovalis Fahringer, 1937 (Hymenoptera: Braconidae: Agathidinae) from Egypt is redescribed and transferred to the genus Troticus Brullé, 1846 (comb. nov.) with Disophrys aegyptiaca Fahringer, 1937, as its junior synonym (syn. nov.). For the first time a reliable host record for the genus and for T. ovalis is given. The holotype of Troticus melamopterus Cameron, 1903 has been examined by the first author and is transferred to the genus Cremnops Foerster, 1862 (C. melamopterus Cameron, 1903 comb. nov.)
Nomenclature notes: John J. Cameron to Horace Kephart
No full textThis 1931 correspondence, from John J. Cameron to Horace Kephart, concerns the nomenclature of the Appalachian mountains. Horace Kephart (1862-1931) was a noted naturalist, woodsman, journalist, and author and promoter of the Great Smoky Mountains National Park.f COPY)
UIUfEl) S1'A.;::» GEOGRAPHIC BOAHD
WASHIISGTOB
March 9,1931.
Irr. Horace Kephart,
Bryson C'..ty,Borth Carolina.
; aear Mr. Kephart:
I thank you for four lot tor of March 5.
I an sorry to hear that yon. were do m with the ' "flu",hut
hop© that this Iftftter will 4't. - active a* ov-r.
* board I "-t yet received a copy of your letter
relative to the Great Smoky Mountains, which you have turned
over to llr. vara* Rhode*, teatlYt tareftary of the Borth ■
Carolina Park Commission.
At your convenience, 1 would like to have you send me a
copy of'that letter. -
a
I note your v to to* Incluaioa of the Max Patch
segment with the Great Smoky Mountains. Incidentally, t. -..
a different* among the authorities whom we consulted on this
point.
Th-! revision of local names on the Borth Carolina part
of the Great Smoky Mountains Batiocal Park is certainly
"big undertaking. I can readily understand that there Is much
duplication and reduplication. The state of Berth Carolina
Is to be congratulated that the revision of such names is
being carrlad or? by one who has such a gr*aft love and intimate
knowledge of the region in question.
She board at its last mooting adopted the suggestion of
the ' l.ttee of Borth Caroline and Tennesoee
relative to the transfer of the names Mount Kephart and Mount
Collins, baft *11 B stipulation that the amm Kephart would
not again be disturbed.
I than;?: you for your offer of further cooperation,which
I shall avail my*ftlf of when n**e*sary#
The board "-111 be pleased if ever it can be of service
to you.
Sincerely,
(Signed) John J.Cameron,
ecretary
Distribution and evolution of starspots on the RS CVn binary II Pegasi in 2004
No full textThis work is supported by National Natural Science Foundation of China through grants Nos. 10373023, 10773027 and 11333006, Chinese Academy of Sciences through project KJCX2-YW-T24.We present Doppler images of RS CVn-type binary II Peg based on two data sets obtained in 2004 February and November. In order to improve signal-to-noise ratio and reliability,we apply least-squares deconvolution technique to calculate average profiles from 2032 photospheric absorption lines. Both of the resulting surface images show a wide latitude distribution of starspots. Most spots are concentrated at a high-latitude belt above 60° and a low-latitude belt near equator. The starspots evolved dramatically between two observing runs, which may indicate shorter time-scale evolution in this epoch, especially for low-latitude belt. There is no stable preferred active longitude that can be found in our images. We also find out a possible phenomenon that the intermediate-latitude spot migrated poleward and merged with the high-latitude spot to make it stronger, which may reveal a more complex behaviour of starspots on II Peg. A potential change of orbital ephemeris zero-point was detected. This may imply an orbital period change of II Peg like other active close binaries.Peer reviewe
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