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Last Loaded on Web: Thursday, May 01, 2008
UnCover® is the online database that corresponds to the popular UnCover service that provides indexing to 17,000 periodical titles. Bibliographic citations for more than seven million articles are included. Some citations have brief abstracts. Issues were entered into the database as the journals were received from the publishers, so articles appeared in the database at the same time the periodical issue was delivered to libraries and newstands.
A network of 20 academic, public, law, medical, and scientific research libraries located around the world own the periodicals containing the bibliographic citations in the UnCover database.
USE FILE 420to locate periodicals in science/social science, medicine, technology, business, and arts/humanities. USE SELECT JN=in combination with your strategy to locate specific journal titles. USE RANK AUto locate experts in a specific discipline. |
The UnCover database indexes 17,000 periodical titles that are primary English-language based. The database is multidisciplinary and covers a wide range of interests that include the fields of science, technology, and medicine; social sciences (including business), and arts/humanities. Journal selection is based on the following:
The following types of articles are not indexed: letters to the editor, poetry, short book reviews, and other items that do not have distinctive titles and authors. These are available through the document delivery service.
| Dates Covered: | September 1988 to 2001 |
|---|---|
| File Size: | Over 10,154,000 records as of June 2001 |
| Update Frequency: | Closed |
| ACRONYM | CATEGORY NAME |
|---|---|
| DOCDEL | Document Delivery - File 420 only |
|
UnCover is provided by The UnCover Company. Questions concerning file content should be directed to: 3801 E. Florida Avenue Suite 200 Denver, CO 80210
|
For Dialog's Redistribution and Archive Policy, enter HELP ERA online.
| DIALOG(R)File 420: UnCover(R) | |
| (c) 1996 The UnCover Company. All rts. reserv. | |
| AA= | 23392101 ORDER NUMBER: 251062219182 |
| /TI | Theoretical Characterization of the Mechanismof Hg - C |
| Bond Cleavage by Halogenic Acids. | |
| AU= | Bencini, Alessandro; Barone, Vincenzo; Uytterhoeven, |
| Myriam G. | |
| JN=, PD=, | Organometallicas. March 5, 1996, v. 15 n. 5, P. 1465 |
| PY=, SO= | |
| SN=, JC= | ISSN: 0276-7333 JOURNAL CODE: 113024142 |
| /AB | Ab initio calculations at the MP2 level show that the |
| CH3 - Hg bond is broken by halogenic acids by a one-step | |
| mechanism, proceeding through a closed transition state | |
| in which, however, bond forming and bleeding are not | |
| completely synchronous. Activation energies closely | |
| parallel HG - C bond strengths and are stronly influenced | |
| by the electronegativity of the ligands bound to Hg. The | |
| general agreement between computed and experimental trends | |
| gives further support to the reaction mechanism. |
| SEARCH SUFFIX |
DISPLAY CODE |
FIELD NAME |
INDEXING |
SELECT EXAMPLES |
|---|---|---|---|---|
| None | None | All Basic Index Fields | Word | S HALOGENIC(W)ACIDS |
| /AB | AB | Abstract1 | Word | S HG(W)C/AB |
| /TI | TI | Title | Word | S HALOGENIC(W)ACIDS/TI |
1 Approximately 50% of the records contain an abstract.
| SEARCH PREFIX |
DISPLAY CODE |
FIELD NAME |
INDEXING |
SELECT EXAMPLES |
|---|---|---|---|---|
| AA= | AA | UnCover Order Number | Phrase | S AA=251062219182 |
| AU= | AU | Author | Phrase | S AU=BENCINI, ALESSANDRO? |
| None | AZ | DIALOG Accession Number | ||
| JC= | JC | Journal Code | Phrase | S JC=113024142 |
| JN= | JN | Journal Name | Phrase | S JN=ORGANOMETALLICS |
| PD= | PD | Publication Date | Phrase | S PD=960305 |
| PY= | PY | Publication Year | Phrase | S PY=1996 |
| SN= | SN | International Standard Serial Number (ISSN) | Phrase | S SN=0276-7333 |
| SO= | SO | Source Information | Word | S SO=(ORGANOMETALLICS(N5)V(W)15) |
| UD= | None | Update | Phrase | S UD=9999 |
| Sets and terms can be limited by Basic Index suffixes, i.e., /AB and /TI (e.g., SELECT S2/TI), as well as by the following features: | ||
| SUFFIX | FIELD NAME | EXAMPLES |
|---|---|---|
| / | DIALOG Accession Number | S S3/00100000-99999999 |
| /ABS | Abstract Present | S S3/ABS |
| /NOABS | No Abstract Present | S S3/NOABS |
| SORTABLE FIELDS | EXAMPLES |
|---|---|
| AA, AU, JN, PD, PY, TI | SORT S1/ALL/TI PRINT S5/5/1-24/TI |
| RANK FIELDS | EXAMPLES |
|---|---|
| All phrase- and numeric-indexed fields in the Additional Indexes can be ranked. | RANK JN RANK AU S4 |
| Display codes listed in the Search Options tables can be used to customize output. | TYPE S3/TI,JN/1-5 |
| NO. |
DIALOGWEB FORMAT |
RECORD CONTENT |
|---|---|---|
| 1 | -- | DIALOG Accession Number |
| 2 | -- | Full Record except Abstract |
| 3 | Medium | Bibliographic Citation |
| 4 | -- | Full Record with Tagged Fields1 |
| 5 | -- | Full Record1 |
| 6 | Free | Title and Order Number |
| 7 | Long | Full Record1 |
| 8 | Short | Title and Order Number |
| 9 | Full | Full Record1 |
| K | -- | KWIC (Key Word In Context) displays a window of text; may be used alone or with other formats |
| FIELD NAME | EXAMPLES | ||
|---|---|---|---|
| If the accession number of a specific record is known, it can be used to display the record directly. | TYPE 00100005/5 DISPLAY 00744832/TI,PD PRINT 50301964/9 |
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Rates For File: UnCover®[420]
Cost per DialUnit: $3.50
Cost per minute: $0.58
Rank Elements $0.00
Format Types Prints
1 $0.00 $0.00
2 $0.31 $0.31
3 $0.31 $0.31
4 $0.31 $0.31
5 $0.31 $0.31
6 $0.00 $0.00
7 $0.31 $0.31
8 $0.00 $0.00
9 $0.31 $0.31
KWIC95 $0.05 NA
KWIC96 $0.05 NA
REDIST/COPY Multiplier Table:
Range Multiplier
1-2 1.00
3-25 1.50
26-100 3.00
101-200 4.00
201-500 6.00
501-1000 8.00
1001 or more 10.00
ARCHIVE Multiplier Table:
Range Multiplier
1-25 1.50
26-200 3.00
201-500 6.00
501-1000 8.00
1001 or more 10.00
