top

  Info

  • Utilizzare la checkbox di selezione a fianco di ciascun documento per attivare le funzionalità di stampa, invio email, download nei formati disponibili del (i) record.

  Info

  • Utilizzare questo link per rimuovere la selezione effettuata.
Effect of aging on the soundness of regularly hydrated dolomitic lime putties / / Lansing S. Wells, Walter F. Clarke, and Ernest M. Levin
Effect of aging on the soundness of regularly hydrated dolomitic lime putties / / Lansing S. Wells, Walter F. Clarke, and Ernest M. Levin
Autore Wells Lansing S
Pubbl/distr/stampa Washington, D.C. : , : U.S. Dept. of Commerce, National Bureau of Standards : , : U.S. Govt. Print. Off., , 127.
Descrizione fisica 1 online resource (ii, 14 pages) : illustrations
Altri autori (Persone) ClarkeWalter F
LevinErnest M
Collana Building materials and structures report
Soggetto topico Building materials
Lime
Plaster - Testing
Putty
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNINA-9910712944203321
Wells Lansing S  
Washington, D.C. : , : U.S. Dept. of Commerce, National Bureau of Standards : , : U.S. Govt. Print. Off., , 127.
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Evaluation of lime/limestone sludge disposal options / / by Radian Corporation
Evaluation of lime/limestone sludge disposal options / / by Radian Corporation
Pubbl/distr/stampa Research Triangle Park, N.C. : , : U.S. Environmental Protection Agency, Office of Air and Water Programs, Office of Air Quality Planning and Standards, , November 1973
Descrizione fisica 1 online resource (171 unnumbered pages) : illustrations (some color)
Soggetto topico Limestone industry
Lime
Flue gases - Desulfurization
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Record Nr. UNINA-9910707060403321
Research Triangle Park, N.C. : , : U.S. Environmental Protection Agency, Office of Air and Water Programs, Office of Air Quality Planning and Standards, , November 1973
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Autore Oates J. A. H (Joseph A. H.)
Pubbl/distr/stampa Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Descrizione fisica 1 online resource (474 p.)
Disciplina 553.51
622.3516
Soggetto topico Lime
Limestone
Soggetto genere / forma Electronic books.
ISBN 1-281-76385-3
9786611763855
3-527-61202-5
3-527-61201-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Lime and Limestone; Contents; 32 Other Uses of Quick and Slaked Lime; 1.1 Introduction; 1.1 General; 1.2 Importance of Lime and Limestone; 1.3 History [1.1-1.3]; 1.4 References; Part 1 Production of Limestone; 2 Formation, Classification and Occurrence of Limestone; 2.1 Formation of Limestone; 2.2 Classification of Limestones; 2.3 Occurrence of Limestones; 2.4 References; 3 Physical and Chemical Properties of Limestone; 3.1 Physical Properties; 3.2 Chemical Properties; 3.3 Impurities; 3.4 References; 4 Prospecting and Quarrying; 4.1 Introduction; 4.2 Prospecting; 4.3 Quarrying; 4.4 Loading
4.5 Hauling4.6 Current Trends in Quarrying; 4.7 Dimension Stone; 4.8 References; 5 Processing and Dispatch of Limestone; 5.1 Introduction; 5.2 Crushing; 5.3 Pulverising and Grinding; 5.4 Production of Precipitated Calcium Carbonate; 5.5 Sizing; 5.6 Benefication; 5.7 Storage and Loading Out; 5.8 Transport; 5.9 Specifications; 5.10 References; 6 Sampling and Testing of Limestone; 6.1 Introduction; 6.2 Sampling; 6.3 Sample Preparation; 6.4 Testing; 6.5 CEN Standards for Test Methods; 6.6 References; Part 2 Uses and Specifications of Limestone
7 Overview and Economic Aspects of the Limestone Market7.1 General; 7.2 Market Overview; 7.3 Economic Aspects; 7.4 References; 8 Construction and Building; 8.1 Introduction; 8.2 Specifications and Test Methods; 8.3 Aggregates for Concrete; 8.4 Sand for Mortars; 8.5 Unbound Aggregates for Roads; 8.6 Aggregates for Asphalts; 8.7 Other Applications; 8.8 CEN Standards for Aggregates; 8.9 References; 9 Use of Limestone in Cement Production; 9.1 Introduction; 9.2 Portland Cement Production; 9.3 Composite Cements; 9.4 Masonry Cements; 9.5 Calcium Aluminate Cements; 9.6 References
10 The Use of Limestone in Agriculture10.1 Introduction; 10.2 Arable Land and Pasture; 10.3 Fertilisers; 10.4 Animal Feedstuffs; 10.5 Poultry Grits; 10.6 Neutralising Acid Rainfall; 10.7 References; 11 Use of Limestone in Refining Metals; 11.1 The Production of Iron; 11.2 Open Hearth Steelmaking; 11.3 Smelting; 11.4 The Production of Alumina; 11.5 References; 12 Other Uses of Limestone; 12.1 Introduction; 12.2 Glass Manufacture; 12.3 Ceramics; 12.4 Mineral Wool; 12.5 Acid Gas Removal; 12.6 Sulfite Process for Paper Pulp; 12.7 Production of Organic Chemicals; 12.8 "Rock Dust" for Mines
12.9 Fillers and Extenders12.10 Water Treatment; 12.11 Sodium Dichromate; 12.12 Calcium Zirconate; 12.13 References; Part 3 Production of Quicklime; 13 Physical and Chemical Properties of Quicklime; 13.1 Physical Properties; 13.2 Chemical Properties; 13.3 References; 14 Raw Materials for Lime Burning (Limestone, Fuel and Refractories); 14.1 General; 14.2 Limestone; 14.3 Fuel; 14.4 Refractory Linings; 14.5 References; 15 Calcination of Limestone; 15.1 Introduction; 15.2 The Chemical Reactions; 15.3 Kinetics of Calcination; 15.4 Sintering of High-calcium Quicklime
15.5 Sintering of Calcined Dolomite
Record Nr. UNINA-9910144327803321
Oates J. A. H (Joseph A. H.)  
Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Autore Oates J. A. H (Joseph A. H.)
Pubbl/distr/stampa Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Descrizione fisica 1 online resource (474 p.)
Disciplina 553.51
622.3516
Soggetto topico Lime
Limestone
ISBN 1-281-76385-3
9786611763855
3-527-61202-5
3-527-61201-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Lime and Limestone; Contents; 32 Other Uses of Quick and Slaked Lime; 1.1 Introduction; 1.1 General; 1.2 Importance of Lime and Limestone; 1.3 History [1.1-1.3]; 1.4 References; Part 1 Production of Limestone; 2 Formation, Classification and Occurrence of Limestone; 2.1 Formation of Limestone; 2.2 Classification of Limestones; 2.3 Occurrence of Limestones; 2.4 References; 3 Physical and Chemical Properties of Limestone; 3.1 Physical Properties; 3.2 Chemical Properties; 3.3 Impurities; 3.4 References; 4 Prospecting and Quarrying; 4.1 Introduction; 4.2 Prospecting; 4.3 Quarrying; 4.4 Loading
4.5 Hauling4.6 Current Trends in Quarrying; 4.7 Dimension Stone; 4.8 References; 5 Processing and Dispatch of Limestone; 5.1 Introduction; 5.2 Crushing; 5.3 Pulverising and Grinding; 5.4 Production of Precipitated Calcium Carbonate; 5.5 Sizing; 5.6 Benefication; 5.7 Storage and Loading Out; 5.8 Transport; 5.9 Specifications; 5.10 References; 6 Sampling and Testing of Limestone; 6.1 Introduction; 6.2 Sampling; 6.3 Sample Preparation; 6.4 Testing; 6.5 CEN Standards for Test Methods; 6.6 References; Part 2 Uses and Specifications of Limestone
7 Overview and Economic Aspects of the Limestone Market7.1 General; 7.2 Market Overview; 7.3 Economic Aspects; 7.4 References; 8 Construction and Building; 8.1 Introduction; 8.2 Specifications and Test Methods; 8.3 Aggregates for Concrete; 8.4 Sand for Mortars; 8.5 Unbound Aggregates for Roads; 8.6 Aggregates for Asphalts; 8.7 Other Applications; 8.8 CEN Standards for Aggregates; 8.9 References; 9 Use of Limestone in Cement Production; 9.1 Introduction; 9.2 Portland Cement Production; 9.3 Composite Cements; 9.4 Masonry Cements; 9.5 Calcium Aluminate Cements; 9.6 References
10 The Use of Limestone in Agriculture10.1 Introduction; 10.2 Arable Land and Pasture; 10.3 Fertilisers; 10.4 Animal Feedstuffs; 10.5 Poultry Grits; 10.6 Neutralising Acid Rainfall; 10.7 References; 11 Use of Limestone in Refining Metals; 11.1 The Production of Iron; 11.2 Open Hearth Steelmaking; 11.3 Smelting; 11.4 The Production of Alumina; 11.5 References; 12 Other Uses of Limestone; 12.1 Introduction; 12.2 Glass Manufacture; 12.3 Ceramics; 12.4 Mineral Wool; 12.5 Acid Gas Removal; 12.6 Sulfite Process for Paper Pulp; 12.7 Production of Organic Chemicals; 12.8 "Rock Dust" for Mines
12.9 Fillers and Extenders12.10 Water Treatment; 12.11 Sodium Dichromate; 12.12 Calcium Zirconate; 12.13 References; Part 3 Production of Quicklime; 13 Physical and Chemical Properties of Quicklime; 13.1 Physical Properties; 13.2 Chemical Properties; 13.3 References; 14 Raw Materials for Lime Burning (Limestone, Fuel and Refractories); 14.1 General; 14.2 Limestone; 14.3 Fuel; 14.4 Refractory Linings; 14.5 References; 15 Calcination of Limestone; 15.1 Introduction; 15.2 The Chemical Reactions; 15.3 Kinetics of Calcination; 15.4 Sintering of High-calcium Quicklime
15.5 Sintering of Calcined Dolomite
Record Nr. UNISA-996212580203316
Oates J. A. H (Joseph A. H.)  
Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Materiale a stampa
Lo trovi qui: Univ. di Salerno
Opac: Controlla la disponibilità qui
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Lime and limestone [[electronic resource] ] : chemistry and technology, production and uses / / J.A.H. Oates
Autore Oates J. A. H (Joseph A. H.)
Pubbl/distr/stampa Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Descrizione fisica 1 online resource (474 p.)
Disciplina 553.51
622.3516
Soggetto topico Lime
Limestone
ISBN 1-281-76385-3
9786611763855
3-527-61202-5
3-527-61201-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Lime and Limestone; Contents; 32 Other Uses of Quick and Slaked Lime; 1.1 Introduction; 1.1 General; 1.2 Importance of Lime and Limestone; 1.3 History [1.1-1.3]; 1.4 References; Part 1 Production of Limestone; 2 Formation, Classification and Occurrence of Limestone; 2.1 Formation of Limestone; 2.2 Classification of Limestones; 2.3 Occurrence of Limestones; 2.4 References; 3 Physical and Chemical Properties of Limestone; 3.1 Physical Properties; 3.2 Chemical Properties; 3.3 Impurities; 3.4 References; 4 Prospecting and Quarrying; 4.1 Introduction; 4.2 Prospecting; 4.3 Quarrying; 4.4 Loading
4.5 Hauling4.6 Current Trends in Quarrying; 4.7 Dimension Stone; 4.8 References; 5 Processing and Dispatch of Limestone; 5.1 Introduction; 5.2 Crushing; 5.3 Pulverising and Grinding; 5.4 Production of Precipitated Calcium Carbonate; 5.5 Sizing; 5.6 Benefication; 5.7 Storage and Loading Out; 5.8 Transport; 5.9 Specifications; 5.10 References; 6 Sampling and Testing of Limestone; 6.1 Introduction; 6.2 Sampling; 6.3 Sample Preparation; 6.4 Testing; 6.5 CEN Standards for Test Methods; 6.6 References; Part 2 Uses and Specifications of Limestone
7 Overview and Economic Aspects of the Limestone Market7.1 General; 7.2 Market Overview; 7.3 Economic Aspects; 7.4 References; 8 Construction and Building; 8.1 Introduction; 8.2 Specifications and Test Methods; 8.3 Aggregates for Concrete; 8.4 Sand for Mortars; 8.5 Unbound Aggregates for Roads; 8.6 Aggregates for Asphalts; 8.7 Other Applications; 8.8 CEN Standards for Aggregates; 8.9 References; 9 Use of Limestone in Cement Production; 9.1 Introduction; 9.2 Portland Cement Production; 9.3 Composite Cements; 9.4 Masonry Cements; 9.5 Calcium Aluminate Cements; 9.6 References
10 The Use of Limestone in Agriculture10.1 Introduction; 10.2 Arable Land and Pasture; 10.3 Fertilisers; 10.4 Animal Feedstuffs; 10.5 Poultry Grits; 10.6 Neutralising Acid Rainfall; 10.7 References; 11 Use of Limestone in Refining Metals; 11.1 The Production of Iron; 11.2 Open Hearth Steelmaking; 11.3 Smelting; 11.4 The Production of Alumina; 11.5 References; 12 Other Uses of Limestone; 12.1 Introduction; 12.2 Glass Manufacture; 12.3 Ceramics; 12.4 Mineral Wool; 12.5 Acid Gas Removal; 12.6 Sulfite Process for Paper Pulp; 12.7 Production of Organic Chemicals; 12.8 "Rock Dust" for Mines
12.9 Fillers and Extenders12.10 Water Treatment; 12.11 Sodium Dichromate; 12.12 Calcium Zirconate; 12.13 References; Part 3 Production of Quicklime; 13 Physical and Chemical Properties of Quicklime; 13.1 Physical Properties; 13.2 Chemical Properties; 13.3 References; 14 Raw Materials for Lime Burning (Limestone, Fuel and Refractories); 14.1 General; 14.2 Limestone; 14.3 Fuel; 14.4 Refractory Linings; 14.5 References; 15 Calcination of Limestone; 15.1 Introduction; 15.2 The Chemical Reactions; 15.3 Kinetics of Calcination; 15.4 Sintering of High-calcium Quicklime
15.5 Sintering of Calcined Dolomite
Record Nr. UNINA-9910831082303321
Oates J. A. H (Joseph A. H.)  
Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Lime and limestone : chemistry and technology, production and uses / / J.A.H. Oates
Lime and limestone : chemistry and technology, production and uses / / J.A.H. Oates
Autore Oates J. A. H (Joseph A. H.)
Pubbl/distr/stampa Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Descrizione fisica 1 online resource (474 p.)
Disciplina 553.51
622.3516
Soggetto topico Lime
Limestone
ISBN 1-281-76385-3
9786611763855
3-527-61202-5
3-527-61201-7
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Lime and Limestone; Contents; 32 Other Uses of Quick and Slaked Lime; 1.1 Introduction; 1.1 General; 1.2 Importance of Lime and Limestone; 1.3 History [1.1-1.3]; 1.4 References; Part 1 Production of Limestone; 2 Formation, Classification and Occurrence of Limestone; 2.1 Formation of Limestone; 2.2 Classification of Limestones; 2.3 Occurrence of Limestones; 2.4 References; 3 Physical and Chemical Properties of Limestone; 3.1 Physical Properties; 3.2 Chemical Properties; 3.3 Impurities; 3.4 References; 4 Prospecting and Quarrying; 4.1 Introduction; 4.2 Prospecting; 4.3 Quarrying; 4.4 Loading
4.5 Hauling4.6 Current Trends in Quarrying; 4.7 Dimension Stone; 4.8 References; 5 Processing and Dispatch of Limestone; 5.1 Introduction; 5.2 Crushing; 5.3 Pulverising and Grinding; 5.4 Production of Precipitated Calcium Carbonate; 5.5 Sizing; 5.6 Benefication; 5.7 Storage and Loading Out; 5.8 Transport; 5.9 Specifications; 5.10 References; 6 Sampling and Testing of Limestone; 6.1 Introduction; 6.2 Sampling; 6.3 Sample Preparation; 6.4 Testing; 6.5 CEN Standards for Test Methods; 6.6 References; Part 2 Uses and Specifications of Limestone
7 Overview and Economic Aspects of the Limestone Market7.1 General; 7.2 Market Overview; 7.3 Economic Aspects; 7.4 References; 8 Construction and Building; 8.1 Introduction; 8.2 Specifications and Test Methods; 8.3 Aggregates for Concrete; 8.4 Sand for Mortars; 8.5 Unbound Aggregates for Roads; 8.6 Aggregates for Asphalts; 8.7 Other Applications; 8.8 CEN Standards for Aggregates; 8.9 References; 9 Use of Limestone in Cement Production; 9.1 Introduction; 9.2 Portland Cement Production; 9.3 Composite Cements; 9.4 Masonry Cements; 9.5 Calcium Aluminate Cements; 9.6 References
10 The Use of Limestone in Agriculture10.1 Introduction; 10.2 Arable Land and Pasture; 10.3 Fertilisers; 10.4 Animal Feedstuffs; 10.5 Poultry Grits; 10.6 Neutralising Acid Rainfall; 10.7 References; 11 Use of Limestone in Refining Metals; 11.1 The Production of Iron; 11.2 Open Hearth Steelmaking; 11.3 Smelting; 11.4 The Production of Alumina; 11.5 References; 12 Other Uses of Limestone; 12.1 Introduction; 12.2 Glass Manufacture; 12.3 Ceramics; 12.4 Mineral Wool; 12.5 Acid Gas Removal; 12.6 Sulfite Process for Paper Pulp; 12.7 Production of Organic Chemicals; 12.8 "Rock Dust" for Mines
12.9 Fillers and Extenders12.10 Water Treatment; 12.11 Sodium Dichromate; 12.12 Calcium Zirconate; 12.13 References; Part 3 Production of Quicklime; 13 Physical and Chemical Properties of Quicklime; 13.1 Physical Properties; 13.2 Chemical Properties; 13.3 References; 14 Raw Materials for Lime Burning (Limestone, Fuel and Refractories); 14.1 General; 14.2 Limestone; 14.3 Fuel; 14.4 Refractory Linings; 14.5 References; 15 Calcination of Limestone; 15.1 Introduction; 15.2 The Chemical Reactions; 15.3 Kinetics of Calcination; 15.4 Sintering of High-calcium Quicklime
15.5 Sintering of Calcined Dolomite
Record Nr. UNINA-9910877737103321
Oates J. A. H (Joseph A. H.)  
Weinheim, Federal Republic of Germany ; ; New York, : Wiley-VCH, c1998
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
The lime belt of Massachusetts and parts of eastern New York and western Connecticut / / by T. Nelson Dale
The lime belt of Massachusetts and parts of eastern New York and western Connecticut / / by T. Nelson Dale
Autore Dale T. Nelson (Thomas Nelson), <1845-1937, >
Pubbl/distr/stampa [Washington, D.C.] : , : Department of the Interior, United States Geological Survey, , 1923
Descrizione fisica 1 online resource (vi, 71 pages, VIII pages of plates) : illustrations, color maps
Collana Bulletin / Department of the Interior, United States Geological Survey
Soggetto topico Geology - Massachusetts
Geology - New York (State)
Geology - Connecticut
Lime - Massachusetts
Lime - New York (State)
Lime - Connecticut
Geology
Lime
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Altri titoli varianti Lime belt of Massachusetts, New York, and Connecticut
Record Nr. UNINA-9910698625903321
Dale T. Nelson (Thomas Nelson), <1845-1937, >  
[Washington, D.C.] : , : Department of the Interior, United States Geological Survey, , 1923
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Six chemicals that changed agriculture / / Robert L. Zimdahl
Six chemicals that changed agriculture / / Robert L. Zimdahl
Autore Zimdahl Robert L.
Pubbl/distr/stampa Amsterdam, [Netherlands] : , : Academic Press, , 2015
Descrizione fisica 1 online resource (211 p.)
Disciplina 630.24
Soggetto topico Agricultural chemicals
Lime
Nitrogen fertilizers
ISBN 0-12-800617-X
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Introduction -- The characteristics of modern agriculture enabled by chemicals -- Lime : A soil amendment -- Nitrogen -- Phosphorus -- 2, 4-D : An herbicide -- DDT : An insecticide -- Recombinant DNA -- Antibiotics -- Conclusion.
Record Nr. UNINA-9910797367903321
Zimdahl Robert L.  
Amsterdam, [Netherlands] : , : Academic Press, , 2015
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
Six chemicals that changed agriculture / / Robert L. Zimdahl
Six chemicals that changed agriculture / / Robert L. Zimdahl
Autore Zimdahl Robert L.
Pubbl/distr/stampa Amsterdam, [Netherlands] : , : Academic Press, , 2015
Descrizione fisica 1 online resource (211 p.)
Disciplina 630.24
Soggetto topico Agricultural chemicals
Lime
Nitrogen fertilizers
ISBN 0-12-800617-X
Formato Materiale a stampa
Livello bibliografico Monografia
Lingua di pubblicazione eng
Nota di contenuto Introduction -- The characteristics of modern agriculture enabled by chemicals -- Lime : A soil amendment -- Nitrogen -- Phosphorus -- 2, 4-D : An herbicide -- DDT : An insecticide -- Recombinant DNA -- Antibiotics -- Conclusion.
Record Nr. UNINA-9910827739803321
Zimdahl Robert L.  
Amsterdam, [Netherlands] : , : Academic Press, , 2015
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui
石膏と石灰 [[セッコウトセッカイ]]
石膏と石灰 [[セッコウトセッカイ]]
Pubbl/distr/stampa Tōkyō-to, : Sekkō Sekkai Kenkyūkai, Shōwa 28-nen [1953]-1994
Descrizione fisica 1 online resource
Soggetto topico Gypsum
Lime
Soggetto genere / forma Periodicals.
ISSN 2185-4351
Formato Materiale a stampa
Livello bibliografico Periodico
Lingua di pubblicazione jpn
Record Nr. UNINA-9910304629203321
Tōkyō-to, : Sekkō Sekkai Kenkyūkai, Shōwa 28-nen [1953]-1994
Materiale a stampa
Lo trovi qui: Univ. Federico II
Opac: Controlla la disponibilità qui