Example sentences of "studies have [be] " in BNC.
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| 31 | But feasibility studies have been carried out and we should be in a position to act when we know what is expected . ’ |
| 32 | The ministry does not do this and no studies have been carried out . |
| 33 | Numerous formal studies have been made to determine the intelligence of the bottlenose dolphin , according to its performance in tests on classical learning , discrimination , and problem solving . |
| 34 | Similar studies have been carried out on axes from the British Isles and , whilst the same alloys were used , the time scale of their introduction and use was quite different . |
| 35 | Detailed studies have been made of the area from a natural-history point of view . |
| 36 | Since then a number of availability studies have been carried out — Mansbridge summarizes in his 1986 article . |
| 37 | Some studies have been made on the timing of decisions to relegate material to remote storage in universities ( see Chapter 11 ) and on the relation between purchase and borrowing through interloans schemes ( see Chapter 13 ) . |
| 38 | The authors observe that up to the present time most obsolescence studies have been characterized by a superficial approach to what is a highly complex situation of interlocking factors . |
| 39 | Although all these studies have been conducted in adult subjects , it appears that higher levels of systolic blood pressure are present in adolescent diabetics compared to non-diabetics both in Europe ( Florey et al , 1976 ) and the USA ( Moss , 1962 ) . |
| 40 | Many studies have been performed using in vitro tests and it is difficult to be certain of the relevance of these tests to platelet function in vivo . |
| 41 | Many self-report studies have been carried out in schools , which will tend to result in school drop-outs and truants being excluded from the sample and lead to an unrepresentative sample . |
| 42 | Numerous studies have been undertaken in US national parks which illustrate the ecological impact of visitors on camp and picnic sites , nature trails and footpaths . |
| 43 | A student who has been debarred from taking an examination or whose studies have been discontinued by decision of the Senate may ask for his case to be reviewed . |
| 44 | By plotting ring patterns of trees in this area , scientists can date ancient building timbers , and other wood artifacts , by comparing ring patterns with those of the bristlecone pines ( such studies have been given the name of dendrochronotogy . |
| 45 | The problem is to seek the correct balance , and to this end monitoring and studies have been in progress since 1989 . |
| 46 | Phosphatidylcholine molecules have been synthesised which contain diacetylenic groups in one ( mixed-chain polymers ) or both acyl chains ( identical-chain polymers ) , and studies have been done on the physical properties and biological applications of these phospholipid polymers . |
| 47 | Several studies have been made of people 's needs and how they are satisfied by work ( see Further Reading ) . |
| 48 | The study of social and economic aspects of early Anglo-Saxon society are still viewed as spin-offs from art-historical and technological study rather than topics worthy of treatment in their own right ; when thematic studies have been produced in recent years the themes have tended to remain based on site-types or artefacts rather than themes which may be more directly relevant to past human behaviour ( Wilson 1976a ) . |
| 49 | The more recent years of early Anglo-Saxon studies have been surveyed by Dickinson ( 1983 ) and Hills ( 1979 ) , who both rightly emphasise the shift away from cemetery excavation to the examination of settlements . |
| 50 | Some of the most detailed studies have been carried out by Leigh ( 1980 ) on sixth-century square-headed brooches from Kent . |
| 51 | Rather , individual studies have been made of certain types in the reports on the excavation of cemeteries . |
| 52 | Where such detailed studies have been made they tend towards the typological and shy away from the technological aspects . |
| 53 | The impact of any examination of variation between brooches in early Anglo-Saxon England is lessened by the near-absence of moulds , and few studies have been made . |
| 54 | Other centres for European and German Studies have been established at Georgetown University , and the University of California , Berkeley . |
| 55 | There is no doubt that some very serious and remarkable studies have been devoted to Modigliani . |
| 56 | Most of these detailed demographic studies have been made with pasture or woodland systems in northern temperate regions and it could well be that in arid zones , and some other extreme environments , biotic pressures are less dominant and then climatic factors may play the major role in killing plants and in natural selection . |
| 57 | Numerous quantitative studies have been done on both birds and mammals in the last twenty years ( reviews in Immelmann , 1972 ; Bateson , 1978a ) and have shown that early experience can have profound and lasting effects on sexual preferences . |
| 58 | Recently , however , two small-scale studies have been completed which take on board the perceptions and experiences of parents who have been on the receiving end of child protection interventions . |
| 59 | Where research studies have been carried out in different parts of the country it is difficult to disentangle anything which might be attributed to regional variations specifically , from other systematic variations by gender , class , ethnicity or variations over time ( that is where changes in patterns of family relationships have occurred between the 1960s and the 1980s ) . |
| 60 | Although the methods used in these studies have been criticized ( Berkner , 1975 ) they have been very influential . |