高校段階への科学教材の開発：カンボジアにおける洗剤に関する研究授業の実践

A study lesson dealing with the detergent concept was carried out at an upper secondary school in Cambodia after a number of teaching materials concerning with detergent were prepared for classroom activities. Through the pre-/post tests and questionnaires responded by students, the lesson study was evluated high appreciation and satisfactory. The activities prepared in the lesson study were applicable by students. It is also recommended that it can be appropriately introduced as part of curriculum at upper secondary schools in Cambodia and other developing countries which required teaching materials.洗剤に関する教材（洗剤量に応じて表面張力の低下により試料水の水滴の大きさが変化することを利用したもの）を開発し、カンボジアの高校でカンボジアから来ている留学生と日本人中学校教諭が研究授業を行った。事前ならびに事後テストを実施したところ、生徒の受け入れ方は大変よく、また洗剤についての理解も深まったことがわかった

Dinuclear lanthanoid(III) dithiocarbamato complexes bridged by (E)-N-benzylidenepicolinohydrazonate: Syntheses, crystal structures and spectroscopic properties

(E)-N-Benzylidenepicolinohydrazide (Hbphz) was used to synthesize a series of hydrazonato-bridged homodinuclear Ln(2)(III) dithiocarbamato (RR'dtc(-)) complexes of the form [{Ln(RR' dtc)(2)}(2)(mu-bphz)(2)] {Ln= La, Pr, Nd, Sm or Eu; RR'= dimethyl-(Me-2) or pyrrolidine-(pyr)}. X-ray crystallographic studies revealed that these complexes possessed a common head-to-tail type dinuclear structural motif in which two hydrazonato ligands bridged two Ln(III) centers in the mu- 1 kappa N-2(py),O:2 kappa O-2,N(imine) mode and two RR'dtc ligands coordinated to each Ln(III) center. Interestingly, while the Sm-III and Eu-III complexes crystallized as simple 8:8-coordinate dinuclear molecules, the lighter Ln(III) (i.e. La-III, Pr-III and Nd-III) complexes afforded in some cases 9:9-coordinate molecules, where the ninth coordination site was occupied by a solvent ethanol or methanol molecule. Even for the lighter Ln(III) complexes, the complexes were solved in dichloromethane or chloroform as the 8:8-coordinate dimer, as revealed by H-1 NMR spectroscopy. In the UV-visible absorption and magnetic circular dichroism (MCD) spectra of the complexes, similar spectral patterns for ligand-centered and Laporte forbidden f-f transitions were observed. The MCD spectral studies demonstrated the characteristic magneto-optical behavior of the complexes

Syntheses and crystal structures of neodymium(III) and europium(III) complexes bearing dimethyl-, pyrrolidine-, or S-prolinol- dithiocarbamato ligands and their natural and magnetic circular dichroism spectra

A series of Nd-III and Eu-III complexes containing achiral or chiral dithiocarbamato (dtc) ligands, [Ln(Xdtc)(3)(NN)] {Ln = Nd or Eu; X = dimethyl- (Me-2), pyrrolidine- (pyr), or (S)-prolinol- (S-proOH); NN = 1,10-phenanthroline (phen) or 2,2'-bipyridine (bpy)}, were prepared and their crystal structures and spectroscopic properties, in particular the natural circular dichroism (CD) and magnetic circular dichroism (MCD), were investigated. The crystal structures of the complexes analyzed by the X-ray diffraction method showed an 8-coordinate geometry around the Ln III center with comparable structural parameters to one another and to the related complexes reported previously. These complexes exhibited similar spectral patterns in their absorption, natural CD and MCD spectra in solution. Weak but characteristic sharp f-f transition bands were observed in the absorption and MCD spectra, but no CD signals associated with these transitions were observed even in the S-proOHdtc complexes. The MCD spectral pattern of the Eu-III complexes revealed a local C-2v symmetry around the Ln(III) center in solution, in contrast to the aqua and the analogous beta-diketonato Eu-III complexes

Homodinuclear lanthanoid(III) dithiocarbamato complexes bridged by 2,2′-bipyrimidine: Syntheses, structures and spectroscopic properties

Four new homodinuclear lanthanoid(III) dithiocarbamato (RR'dtc(-)) complexes bridged by 2,2'-bipyrimidine (bpm) of the form [{Ln(RR'dtc)(3)}(2)(mu-bpm)] {Ln = Nd or Eu; RR' = dimethyl- (Me-2) or pyrrolidine(pyr)} were prepared and their crystal structures and spectroscopic properties were characterized. The crystallographic studies revealed that all of the complexes possess a similar structural motif with an 8:8-coordination geometry, in which the bpm ligand bridges two Ln(III) centers in the kappa N-2(1,1') : kappa N-2(3,3') mode and three RR'dtc(-) ligands coordinate to each Ln(III) center. The complexes exhibit weak but relatively sharp f-f transition bands in the absorption and magnetic circular dichroism (MCD) spectra recorded in the visible region. The MCD spectral studies demonstrated the magneto-optical behavior of the complexes. The spectral features of the dithiocarbamato complexes were distinctly different from those of their beta-diketonato analogues, suggesting the coordination environment around the Ln(III) center influences the electronic structure and spectroscopic symmetry of the complexes in solution

Development of teaching materials on water color using a plastic pipe as a long path cell ： their applications to elementary science lessons

　Water is an essential substance for living things. Topic on water are at grades 3-6 in elementary science. The roles and functions of water (erosion, accumulation, transportation), germination and growth of plants, etc. On the other hand, the properties of water are not treated except physical change like boiling, evaporation, freezing, etc. 　The color, taste, and smell of water are not discussed in elementary science. This research proposes that the color of water because an excellent theme for inquire based leaning. We have developed a suitable and low cost teaching material for the water color. Furthermore, we have conducted a few lessons with the teaching materials to examine the appropriateness

A Research on Concepts of Particle for Substance in High School Chemistry

中学校理科、並びに高校化学における基礎概念の物質の粒子概念や原子・分子の粒子としての表現についてある普通科高校の高校生1年から3年までの全クラスの生徒997名対象に、イメージ図を用いて理解度を測定する目的で調査を行い、イメージとして物質の粒子概念が高校生にどうとらえられているかを明らかにした。この結果より全般的に基礎知識の理解とその応用について不十分であることがわかった。また、全学年で化学変化と物理変化の違いについてイメージができておらず、化学の本質の理解の点で問題点があることがわかった。We have carried out a research on concepts of particle for substance in high school chemistry and junior high school natural science by questionair method with image schema. One of the purposes is the measurement of high school students' understanding depth on substance aas particles. The result shows that many students cannot distinguish pure substance, pure element, pure compound and so many students do not understand physical and chemical changes. Our conclusion is that there are some issues on chemistry culiculum and textbooks in the basic and fundamental level

環境教育に関する生徒の知識、意識、関心に関する調査研究―日本の普通科高校を例として―

Education for Sustainable Development(ESD)-Environmental Education, has been a major concern at most UN summits. The 2002 Johannesburg Summit broadened the vision and re-affirmed the objective of the Millennium evelopment Goals (MDS) and proclaimed the Decade of Education for Sustainable Development for the period 2005-2014. This emphasized that education, is critical for promoting sustainable development and improving capacity of the people to address environment and development issues. This paper seeks to report, a finding on the level of student awareness and interests in environmental issues at a High School in Japan (a Super Science High School). A curricula unit was developed in the area of environmental education on soil. An actual chemistry class has been conducted in English. Pre & post lesson questionnaires were administered to the students. The result of the analysis indicates that, students are aware of environmental issues but need to be exposed to these issues in the form of activity-based classroom lessons. This we believe, will enable the students appreciate the fact that ESD is a life-wide and lifelong endeavor which challenges individuals, institutions and societies to view tomorrow as a day that belongs to all of us. This we presume is the main challenge of the MDS.持続可能な開発と環境教育は世界的な課題であり、2002年のヨハネスブルク環境サミットでも議題として採り上げられ、特に教育によって持続可能な社会の発展を進めることが合意された。本研究は日本のある高校で1年間にわたって、土を題材とした単元を実施し、その事前事後に環境問題に関する調査を行い、生徒の環境に関する知識、意識、関心についてどのような水準にあり、授業によってどうかわるかを調査し、明らかにした

Determination of individual factors associated with hallux valgus using SVM-RFE

Introduction This cross-sectional study aimed to determine the factors related to hallux valgus (HV) and their importance using support vector machine-recursive feature elimination (SVM-RFE). Methods A total of 864 participants aged ≥ 18 years were enrolled. The Manchester scale was used to determine the presence of HV (summed scores for both feet ≥ 4). The questionnaire included items such as age, sex, height, weight, and foot measurements. These internal factors were analyzed to determine if they are related to HV using SVM-RFE. Results The results of tenfold cross-validation using SVM-RFE revealed that the numbers of feature selections were 10, 10, and 9 for age, sex, and body weight, respectively, and these factors were shown to be related to HV. HV was found to be more common in women than in men (women, 24.9%; men, 7.6%), but the sex difference was not significant in older people. Conclusion Age and sex were found to be important factors associated with HV identified via feature selection using SVM-RFE