177,252 research outputs found
RECUMBENT VS UPRIGHT BICYCLES: OPERATIVE RANGE OF PROPULSIVE MUSCLES, 3D TRAJECTORY OF BODY CENTRE OF MASS AND LIMB MECHANICAL WORK
Full text linkIntroduction. Humans have always tried to move safely and faster in a variety of environment, even through the aid of passive tools that help to improve the limits imposed by the body characteristics. These means of locomotion, without supplying additional mechanical energy, are able to greatly improve the performance exploiting the use of muscular force alone. Bicycles are probably the passive tool most known and used in the world. The origin of this thesis comes from the interest to increase the knowledge about the features of a particular kind of bike: the Recumbent bicycle (RB). It is a high performance human powered vehicle where the cyclist is in a reclined position, with the back against a backrest. The peculiarity of the RB is that it allows to reach higher speeds than Normal/upright bicycles (NB), at the same metabolic power, principally due to aerodynamic advantages. Indeed, with the use of particular fairings that improve aerodynamics, these vehicles allow to exceed 130 km/h only with muscles power. The change in posture of the rider, consequent to the different characteristics and design of the bicycles, alters kinematics and energetics of cycling and could also affects muscle-tendon lengths and the operating range of the muscles length-tension curves. Despite the interest of the scientific community on the topic of cycling, some aspects still need to be investigated, especially with respect to the differences between traditional and recumbent bikes, which represent the most advanced evolution of that tool.
Aim. The aim of this work is to analyze and compare the pedalling cycle on both bicycles from a biomechanical point of view. Indeed, with a comprehensive description of mechanical and metabolic consequences during cycling in both configuration, new vehicles could be designed with those technological changes that could increase the performance. Particular focus has been posed on the effect of the different position while riding the two bicycles:
- on the muscle-tendon length of different muscle-tendon unit involved in cycling;
- on the 3D displacement of the Body Centre of Mass (BCoM);
- on the mechanical work (in particular the internal and the "additional" external mechanical work).
Methods. The issues have been investigated both experimentally and trough simulations. By using 3D kinematic data and a physical simulation program we measured muscles-tendon length, 3D Body Centre of Mass (BCoM) trajectory and its symmetries and the components of the total mechanical work necessary to sustain cycling during stationary cycling, at different pedalling cadences (50, 70, 90 and 110 rpm). This approach allows to investigate the biomechanics of riding the two bicycles both through direct measurements of mechanical work and indirect estimation performed with simulation models.
Results and Discussion. Joint kinematics and muscle-tendon length were analyzed with the musculoskeletal modelling software Opensim®. This analysis showed that, differently from cadence, the two bicycles caused changes in joint angles and, consequently, in muscle-tendon length. As a results in RB, when compared to NB, some muscles are slightly stretched while other are shortened, making the propulsive effectiveness impossible to be assessed. This work confirms experimentally, for the first time, that the BCoM in cycling moves along all three spatial axes, while before this study an elliptical movement in the sagittal plane was appreciated only with a 2D simulation. BCoM trajectory, confined in a 15 mm side cube, changed its orientation maintaining a similar pattern in both configurations, with advantages for RB: a smaller additional mechanical external power (on average 16.1 ± 9.7 W on RB versus 20.3 ± 8.8 W on NB), a greater Symmetry Index on progression axis and no differences in the internal mechanical power (ranged from 7.90 W to 65.15 W in NB and from 7.25 W to 62.16 W in RB, increasing as function of the rpm).
Conclusion. Despite the human physiological characteristics have remained almost unchanged over the last millennia, performance on bicycles has increased significantly. This has been possible thanks to the work of mechanical engineers, exercise physiologists and biomechanists. In this thesis the body centre of mass trajectory and the associated additional external mechanical work while pedalling on recumbent bicycle has been studied experimentally for the first time. It is thought that the development of mechanisms reducing additional external power through a further containment of BCoM trajectory, together with additional studies on the effectiveness of propulsive muscles could be necessary to further refine design and improve performance of RB
Bazı Türk Mermerlerinin Tür-І Kırılma Tokluğu İle Elmas Telli Kesme Makinelerinin Performansı Arasındaki İlişkilerin Analizi
No full textIn this study, relationships between mode-І fracture toughness values of 6 different marbles (4 real marble, 2 limestone) selected from different natural stone quarries of Turkey and performance parameters of monowire cutting machine (monowire) and diamond wire cutting machine were analyzed. Semi-circular bending (SCB) test method was used in order to determine mode-І fracture toughness values. As performance parameters, unit wear and unit energy for the monowire cutting machine; unit wear and cutting speed for the diamond wire cutting machine were used. And beside that, the physico-mechanical properties of marbles were determined and relationships between these properties and both fracture toughness values and performance parameters were also investigated.
With the help of the results obtained from these investigations, a logarithmic relationship with a coefficient of correlation of 0,91 between the fracture toughness and unit energy, which is the performance parameters of the monowire cutting machine, was determined. It was also found out that there is a linear relationship with a coefficient of correlation of 0,56 between the fracture toughness and unit wear, which is the other performance parameter of the monowire cutting machine.
When the relationships between the performance parameters of diamond wire cutting machine and fracture toughness were examined, it was determined that there is a linear relationship with a coefficient of correlation of 0,54 with the unit wear; and an inverse linear relationship with a coefficient of correlation of 0,52 with cutting speed.
It was found that there are relationships with high correlation coefficient between the mechanical properties of the marbles used in the study, which are shore hardness index, uniaxial compressive strength,indirect tension strength, bohme surface abrasion strength,fracture toughness and the performance parameters of diamond wire cutting machines. Similarly, meaningful relationships between fracture toughness and other mechanical properties were also obtained.
Furthermore, relationships with low correlation coefficient between the performance parameters of the diamond wire cutting machines and the physical properties of the marbles were obtained except for the unit volume weight analysis. Likewise, the only meaningful correlation between fracture toughness and physical properties was obtained from the unit volume weight analysis.
As a result, it has been demonstrated that the mode-І fracture toughness values can be used in reliably predicting the performance parameters of diamond wire cutting machines, which are increasingly used in the mining industry.İÇİNDEKİLER
ÖZET i
ABSTRACT iii
TEŞEKKÜR v
İÇİNDEKİLER vi
ÇİZELGELER DİZİNİ ix
ŞEKİLLER DİZİNİ xi
SİMGELER VE KISALTMALAR xv
1. GİRİŞ 1
1.1. Çalışmanın Amacı 2
1.2. Metodoloji 2
1.3. Tezin İçeriği 3
1.4. Literatür İncelemesi 4
2. ELMAS TELLİ KESME MAKİNELERİ 8
2.1. Elmas Telli Kesme Makineleri Çeşitleri 10
2.1.1. Tektelli Kesme Makineleri (Monoteller) 10
2.1.2. Çoklu Elmas Telli Kesme Makineleri 11
2.1.3. Raylı veya Tekerlekli Elmas Telli Kesme Makineleri 13
3. KIRILMA TOKLUĞU 14
3.1. Kırılma Mekaniği ve Gelişimi 14
3.1.1. Gerilme Şiddet Faktörü ve Kırılma Tokluğu 16
3.1.2. Lineer Elastik Kırılma Mekaniği ve Elastik Plastik Kırılma Mekaniği 17
3.1.3. Kırılma Türleri 18
3.1.4. Kırılma Mekaniğinin Kayaçlarda Uygulama Alanları 19
3.2. Kayaçların Tür-І Kırılma Tokluğu Deneyleri 19
3.3. Yarım-Dairesel Eğilme (SCB) Test Metodu 21
3.3.1. SCB Numunesi ve Deney Düzeniği 22
3.3.2. Kırılma Tokluğu Hesaplamaları 24
4. DENEYSEL ÇALIŞMALAR 26
4.1. Çalışmada Kullanılan Doğal Taşlar ve Hazırlık Çalışmaları 28
4.2. Doğal Taşların Fiziko-Mekanik Özelliklerinin Belirlenmesi 29
4.3. Doğal Taşların Tür-І Kırılma Tokluğu Değerlerinin Belirlenmesi 29
4.3.1. SCB Numunesinin Hazırlanması 29
4.3.2. Deney Düzeneğinin Kurulumu 33
4.3.3. SCB Numunesinin Kırıldıktan Sonraki Analizi 35
4.3.4. SCB Numunelerinin Geometrisi 37
4.4. Çalışmada Kullanılan Doğal Taşların Tür-І Kırılma Tokluğu Sonuçları 38
5. SONUÇLARIN DEĞERLENDİRİLMESİ 42
5.1. Elmas Telli Kesme Makinelerinin Performans Parametreleri 42
5.2. Tür-І Kırılma Tokluğu Değerleri ile Elmas Telli Kesme Makinelerinin Performans Parametreleri Arasındaki İlişkilerin Analizi 43
5.2.1. Tektelli Kesme Makinesinin Performans Parametreleri ile Tür-І Kırılma Tokluğu Arasındaki İlişkinin Analizi 43
5.2.2. Elmas Tel Kesme Makinesinin Performans Parametreleri ile Tür-І Kırılma Tokluğu Arasındaki İlişkinin Analizi 45
5.3. Tür-І Kırılma Tokluğu Değerleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 47
5.3.1. Tür-І Kırılma Tokluğu Değerleri ile Diğer Mekanik Özellikler Arasındaki İlişkilerin Analizi 47
5.3.2. Tür-І Kırılma Tokluğu Değerleri ile Fiziksel Özellikler Arasındaki İlişkilerin Analizi 50
5.4. Elmas Telli Kesme Makinelerinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 52
5.4.1. Tektelli Kesme Makinesinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 52
5.4.2. Elmas Telli Kesme Makinesinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 61
6. SONUÇLAR VE ÖNERİLER 69
KAYNAKLAR 72
EKLER 77
ÖZGEÇMİŞ 90Bu çalışmada, ülkemizin farklı doğal taş ocaklarından seçilen 6 farklı mermerin (4 hakiki mermer, 2 kireçtaşı) tür-І kırılma tokluğu değerleri ile tektelli kesme makinesi (monotel) ve elmas telli kesme makinesinin performans parametreleri arasındaki ilişkiler incelenmiştir. Tür-І kırılma tokluğu değerlerini belirlemek için yarım-dairesel eğilme (SCB) test metodu kullanılmıştır. Performans parametreleri olarak tektelli kesme makinesi için birim aşınma ve birim enerji, elmas telli kesme makinesi için ise kesim hızı ve birim aşınma değerleri kullanılmıştır. Ayrıca mermerlerin fiziko-mekanik özellikleri belirlenerek, bu özellikler ile kırılma tokluğu ve performans parametreleri arasındaki ilişkiler de araştırılmıştır.
Yapılan çalışmalar sonucunda, kırılma tokluğu ile tektelli kesme makinesinin performans parametrelerinden birim enerji arasında R=0,91’lik logaritmik bir ilişki, birim aşınma ile arasında ise R=0,56’lık doğrusal bir ilişki tespit edilmiştir. Kırılma tokluğu ile elmas telli kesme makinesinin performans parametrelerinden birim aşınma arasında R=0,54’lık doğrusal, kesim hızı ile arasında ise ters yönlü R=0,52’lik doğrusal bir ilişki bulunmuştur.
Çalışmada kullanılan mermerlerin mekanik özelliklerinden shore sertlik indeksi, tek eksenli basınç dayanımı, dolaylı çekme dayanımı, böhme yüzey aşınma dayanımı ve kırılma tokluğu ile elmas telli kesme makinelerinin performans parametreleri arasında yüksek korelasyon katsayıları elde edilmiştir. Benzer şekilde, kırılma tokluğu ile diğer mekanik özellikler arasında da anlamlı ilişkiler elde edilmiştir.
Bununla birlikte, elmas telli kesme makinelerinin performans parametreleri ile mermerlerin fiziksel özellikleri arasında ise birim hacim ağırlık hariç diğerlerinde düşük korelasyon katsayıları elde edilmiştir. Ayrıca, kırılma tokluğu ile mermerlerin fiziksel özellikleri arasındaki tek anlamlı ilişki, birim hacim ağırlık ile elde edilmiştir.
Sonuç olarak, tür-І kırılma tokluğu değerlerinin madencilik sektöründe kullanımı hızla artan elmas telli kesme makinelerinin performans parametrelerinin güvenilir olarak tahmin edilmesinde kullanılabileceği ortaya konulmuştur
BAZI TÜRK MERMERLERİNİN TÜR-І KIRILMA TOKLUĞU İLE ELMAS TELLİ KESME MAKİNELERİNİN PERFORMANSI ARASINDAKİ İLİŞKİLERİN ANALİZİ
No full textIn this study, relationships between mode-І fracture toughness values of 6 different marbles (4 real marble, 2 limestone) selected from different natural stone quarries of Turkey and performance parameters of monowire cutting machine (monowire) and diamond wire cutting machine were analyzed. Semi-circular bending (SCB) test method was used in order to determine mode-І fracture toughness values. As performance parameters, unit wear and unit energy for the monowire cutting machine; unit wear and cutting speed for the diamond wire cutting machine were used. And beside that, the physico-mechanical properties of marbles were determined and relationships between these properties and both fracture toughness values and performance parameters were also investigated.
With the help of the results obtained from these investigations, a logarithmic relationship with a coefficient of correlation of 0,91 between the fracture toughness and unit energy, which is the performance parameters of the monowire cutting machine, was determined. It was also found out that there is a linear relationship with a coefficient of correlation of 0,56 between the fracture toughness and unit wear, which is the other performance parameter of the monowire cutting machine.
When the relationships between the performance parameters of diamond wire cutting machine and fracture toughness were examined, it was determined that there is a linear relationship with a coefficient of correlation of 0,54 with the unit wear; and an inverse linear relationship with a coefficient of correlation of 0,52 with cutting speed.
It was found that there are relationships with high correlation coefficient between the mechanical properties of the marbles used in the study, which are shore hardness index, uniaxial compressive strength,indirect tension strength, bohme surface abrasion strength,fracture toughness and the performance parameters of diamond wire cutting machines. Similarly, meaningful relationships between fracture toughness and other mechanical properties were also obtained.
Furthermore, relationships with low correlation coefficient between the performance parameters of the diamond wire cutting machines and the physical properties of the marbles were obtained except for the unit volume weight analysis. Likewise, the only meaningful correlation between fracture toughness and physical properties was obtained from the unit volume weight analysis.
As a result, it has been demonstrated that the mode-І fracture toughness values can be used in reliably predicting the performance parameters of diamond wire cutting machines, which are increasingly used in the mining industry.İÇİNDEKİLER
ÖZET i
ABSTRACT iii
TEŞEKKÜR v
İÇİNDEKİLER vi
ÇİZELGELER DİZİNİ ix
ŞEKİLLER DİZİNİ xi
SİMGELER VE KISALTMALAR xv
1. GİRİŞ 1
1.1. Çalışmanın Amacı 2
1.2. Metodoloji 2
1.3. Tezin İçeriği 3
1.4. Literatür İncelemesi 4
2. ELMAS TELLİ KESME MAKİNELERİ 8
2.1. Elmas Telli Kesme Makineleri Çeşitleri 10
2.1.1. Tektelli Kesme Makineleri (Monoteller) 10
2.1.2. Çoklu Elmas Telli Kesme Makineleri 11
2.1.3. Raylı veya Tekerlekli Elmas Telli Kesme Makineleri 13
3. KIRILMA TOKLUĞU 14
3.1. Kırılma Mekaniği ve Gelişimi 14
3.1.1. Gerilme Şiddet Faktörü ve Kırılma Tokluğu 16
3.1.2. Lineer Elastik Kırılma Mekaniği ve Elastik Plastik Kırılma Mekaniği 17
3.1.3. Kırılma Türleri 18
3.1.4. Kırılma Mekaniğinin Kayaçlarda Uygulama Alanları 19
3.2. Kayaçların Tür-І Kırılma Tokluğu Deneyleri 19
3.3. Yarım-Dairesel Eğilme (SCB) Test Metodu 21
3.3.1. SCB Numunesi ve Deney Düzeniği 22
3.3.2. Kırılma Tokluğu Hesaplamaları 24
4. DENEYSEL ÇALIŞMALAR 26
4.1. Çalışmada Kullanılan Doğal Taşlar ve Hazırlık Çalışmaları 28
4.2. Doğal Taşların Fiziko-Mekanik Özelliklerinin Belirlenmesi 29
4.3. Doğal Taşların Tür-І Kırılma Tokluğu Değerlerinin Belirlenmesi 29
4.3.1. SCB Numunesinin Hazırlanması 29
4.3.2. Deney Düzeneğinin Kurulumu 33
4.3.3. SCB Numunesinin Kırıldıktan Sonraki Analizi 35
4.3.4. SCB Numunelerinin Geometrisi 37
4.4. Çalışmada Kullanılan Doğal Taşların Tür-І Kırılma Tokluğu Sonuçları 38
5. SONUÇLARIN DEĞERLENDİRİLMESİ 42
5.1. Elmas Telli Kesme Makinelerinin Performans Parametreleri 42
5.2. Tür-І Kırılma Tokluğu Değerleri ile Elmas Telli Kesme Makinelerinin Performans Parametreleri Arasındaki İlişkilerin Analizi 43
5.2.1. Tektelli Kesme Makinesinin Performans Parametreleri ile Tür-І Kırılma Tokluğu Arasındaki İlişkinin Analizi 43
5.2.2. Elmas Tel Kesme Makinesinin Performans Parametreleri ile Tür-І Kırılma Tokluğu Arasındaki İlişkinin Analizi 45
5.3. Tür-І Kırılma Tokluğu Değerleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 47
5.3.1. Tür-І Kırılma Tokluğu Değerleri ile Diğer Mekanik Özellikler Arasındaki İlişkilerin Analizi 47
5.3.2. Tür-І Kırılma Tokluğu Değerleri ile Fiziksel Özellikler Arasındaki İlişkilerin Analizi 50
5.4. Elmas Telli Kesme Makinelerinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 52
5.4.1. Tektelli Kesme Makinesinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 52
5.4.2. Elmas Telli Kesme Makinesinin Performans Parametreleri ile Fiziko-Mekanik Özellikler Arasındaki İlişkilerin Analizi 61
6. SONUÇLAR VE ÖNERİLER 69
KAYNAKLAR 72
EKLER 77
ÖZGEÇMİŞ 90Bu çalışmada, ülkemizin farklı doğal taş ocaklarından seçilen 6 farklı mermerin (4 hakiki mermer, 2 kireçtaşı) tür-І kırılma tokluğu değerleri ile tektelli kesme makinesi (monotel) ve elmas telli kesme makinesinin performans parametreleri arasındaki ilişkiler incelenmiştir. Tür-І kırılma tokluğu değerlerini belirlemek için yarım-dairesel eğilme (SCB) test metodu kullanılmıştır. Performans parametreleri olarak tektelli kesme makinesi için birim aşınma ve birim enerji, elmas telli kesme makinesi için ise kesim hızı ve birim aşınma değerleri kullanılmıştır. Ayrıca mermerlerin fiziko-mekanik özellikleri belirlenerek, bu özellikler ile kırılma tokluğu ve performans parametreleri arasındaki ilişkiler de araştırılmıştır.
Yapılan çalışmalar sonucunda, kırılma tokluğu ile tektelli kesme makinesinin performans parametrelerinden birim enerji arasında R=0,91’lik logaritmik bir ilişki, birim aşınma ile arasında ise R=0,56’lık doğrusal bir ilişki tespit edilmiştir. Kırılma tokluğu ile elmas telli kesme makinesinin performans parametrelerinden birim aşınma arasında R=0,54’lık doğrusal, kesim hızı ile arasında ise ters yönlü R=0,52’lik doğrusal bir ilişki bulunmuştur.
Çalışmada kullanılan mermerlerin mekanik özelliklerinden shore sertlik indeksi, tek eksenli basınç dayanımı, dolaylı çekme dayanımı, böhme yüzey aşınma dayanımı ve kırılma tokluğu ile elmas telli kesme makinelerinin performans parametreleri arasında yüksek korelasyon katsayıları elde edilmiştir. Benzer şekilde, kırılma tokluğu ile diğer mekanik özellikler arasında da anlamlı ilişkiler elde edilmiştir.
Bununla birlikte, elmas telli kesme makinelerinin performans parametreleri ile mermerlerin fiziksel özellikleri arasında ise birim hacim ağırlık hariç diğerlerinde düşük korelasyon katsayıları elde edilmiştir. Ayrıca, kırılma tokluğu ile mermerlerin fiziksel özellikleri arasındaki tek anlamlı ilişki, birim hacim ağırlık ile elde edilmiştir.
Sonuç olarak, tür-І kırılma tokluğu değerlerinin madencilik sektöründe kullanımı hızla artan elmas telli kesme makinelerinin performans parametrelerinin güvenilir olarak tahmin edilmesinde kullanılabileceği ortaya konulmuştur
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Recumbent vs. upright bicycles:3D trajectory of body centre of mass, limb mechanical work, and operative range of propulsive muscles
Full text linkRecumbent bicycles (RB) are high performance, human-powered vehicles. In comparison to normal/upright bicycles (NB) the RB may allow individuals to reach higher speeds due to aerodynamic advantages. The purpose of this investigation was to compare the non-aerodynamic factors that may potentially influence the performance of the two bicycles. 3D body centre of mass (BCoM) trajectory, its symmetries, and the components of the total mechanical work necessary to sustain cycling were assessed through 3D kinematics and computer simulations. Data collected at 50, 70, 90 110 rpm during stationary cycling were used to drive musculoskeletal modelling simulation and estimate muscle-tendon length. Results demonstrated that BCoM trajectory, confined in a 15-mm side cube, changed its orientation, maintaining a similar pattern across all cadences in both bicycles. RB displayed a reduced additional mechanical external power (16.1 ± 9.7 W on RB vs. 20.3 ± 8.8 W on NB), a greater symmetry on the progression axis, and no differences in the internal mechanical power compared to NB. Simulated muscle activity revealed small significant differences for only selected muscles. On the RB, quadriceps and gluteus demonstrated greater shortening, while biceps femoris, iliacus, and psoas exhibited greater stretch; however, aerodynamics still remains the principal benefit.</p
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
Full text linkBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Letter from R. R. Zellick, Assistant Trust Officer, Anglo California National Bank of San Francisco, to Joseph R. Goodman, October 2, 1942
No full textLetter from R. R. Zellick, Assistant Trust Officer at The Anglo California National Bank of San Francisco, to Joseph R. Goodman, regarding property owned by Dave Tatsuno. Zellick mentions a dispute between current tenants and Tatsuno, and that Tatsuno has asked Goodman to help locate trustworthy tenants.Personal correspondence, organizational records, government documents, publications, and other papers created or collected by Joseph R. Goodman documenting the forced removal and incarceration of Japanese Americans during World War II, as well as organized resistance to incarceration. Included in the collection are records of the Japanese Young Men's Christian Association and the Japanese American Citizens' League in San Francisco, including papers of the Japanese YMCA's executive secretary Lincoln Kanai; Sakai family papers; Goodman's correspondence to and from Japanese American incarcerees, organizations opposing forced removal and incarceration of Japanese Americans, the War Relocation Authority, and others; publications, photographs, and ephemera from the Topaz Relocation Center, where Goodman taught high school; War Relocation Authority records and publications; and newspaper clippings, pamphlets, and reports about forced removal and incarceration created by various government, religious, and civic organizations, in California and nationwide
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