Dilation of nervi corporis allati 2 (NCA 2) — a neurohaemal structure inChrysocoris stolli wolf. (Heteroptera: Pentatomidae)

Summary The NCA 2 is dilated in about the middle of its length. Neurosecretory material is stored in this dilation. It serves as a secondary neurohaemal organ for lateral neurosecretion.     

Evidence for a modulation of the stress response by the pineal gland

Wistar rats show a circadian variation in their response to stress. Pinealectomy exacerbates stress-induced gastric ulceration in rats. This effect is counteracted by melatonin administration.     

Cholesterol metabolism in the myelin of rat brain

Résumé La persistance de la radioactivité incorporée dans le cholesterol et les lipides totaux de la myeline cérébrale a été mesurée pendant 200 jours après un injection i.p. de glucose U-¹⁴C chez des rats de 6 semaines ayant donc précisément dépassé la période de myelinisation active et également chez des animaux de 6 mois. La radioactivité spécifique relativement faible incorporée dans le cholesterol de la myeline des animaux les plus jeunes a décru lentement tandis que chez les animaux adultes elle est restée pratiquement constante. L'incorporation de carbone de glucose dans le cholesterol de la myeline des animaux adultes ne reflète probablement pas le «turnover» du cholesterol mais pourrait indiquer plutôt que la myeline continue à être formée lentement tout au long de la vie de l'animal.     

Amperometric studies on chromium (III) and iron (III) hydroxocyanotungstates (IV)

Zusammenfassung Die Zusammensetzung von in wässeriger Lösung gebildeten Ionenpaaren des Anions [W(CN)₄(OH)₄]^4- mit Cr³⁺ bzw. Fe³⁺ wird amperometrisch ermittelt.

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Acknowledgment. The authors are grateful to Dr.S. M. F. Rahman for providing necessary facilities and C.S.I.R. (India) for awarding a Junior Fellowship to one of them (K. U.).     

Effect of oxygen content on the structural and optical properties of ZnO films grown by atmospheric pressure MOCVD

Atmospheric pressure MOCVD was used to deposit ZnO layers on sapphire and homoepitaxial template under different oxygen flow rates.Oxygen content affects the lattice constant value and texture coefficient of the films as evidenced by the θ-2θ peaks position and their intensity.Films deposited at lower oxygen flow rate possess higher value of strain and stresses.ZnO films deposited at high oxygen flow rates show intense UV emissions while samples prepared under oxygen deficient conditions exhibited defect related emission along with UV luminescence.The results are compared to the ZnO films deposited homoepitaxially on annealed ZnO samples.The data obtained suggest that ZnO stoichiometry is responsible for the structural and optical quality of ZnO films.     

Mn0.8Zn0.2Fe2O4 nanoparticulates spinel ferrites:An approach to enhance the antenna field strength for improved magnitude versus offset（MVO）

Electromagnetic signals in deep reservoir are very weak so that it is difficult to predict about the presence of hydrocarbon in seabed logging(SBL) environment.In the present work,Mn0.8Zn0.2Fe2O4 nanoferrites were prepared by a sol–gel technique at different sintering temperatures of450 °C,650 °C and 850 °C to increase the strength of electromagnetic(EM) antenna.XRD,FESEM,Raman spectroscopy and HRTEM were used to analyze the phase,surface morphology and size of the nanoferrites.Magnetic properties of the nanoferrites were also measured using an impedance network analyzer.However,nanoferrites sintered at 850 °C with initial permeability of 200 and Q factor of 50 were used as magnetic feeders with the EM antenna.Lab scale experiments were performed to investigate the effect of magnetic field strength in scale tank.SPSS and MATLAB softwares were also used to confirm the oil presence in scale tank.It was observed that the magnitude of the EM waves for the antenna was increased up to 233%.Finally,the correlation values also show 208% increase in the magnetic field strength with the presence of the oil.Therefore,antenna with Mn0.8Zn0.2Fe2O4 nanoferrites based magnetic feeders can be used for deep water and deep target hydrocarbon exploration.     

藏东地区发现罕见的恐龙足迹群和古大象足迹群

西藏昌都市卡若区发现罕见的蜥脚类、兽脚类、鸟脚类频密共生的恐龙足迹化石群,产于中侏罗世达布卡组滨湖相沉积中;昌都市江达县雪集拉山发现古近纪大象足迹化石群,产于贡觉组湖相、三角洲相地层中.这两个化石群是青藏高原中新生代地质演化的重要历史见证,对研究青藏高原隆升和恐龙、古大象的迁徙、演化、古生态有着极其重要的意义.     

硫酸中香蕉皮还原低品位锰矿的浸出行为及动力学模型

Manganese was leached from a low-grade manganese ore (LGMO) using banana peel as the reductant in a dilute sulfuric acid medium. The effects of banana peel amount, H₂SO₄ concentration, reaction temperature, and time on Mn leaching from the complex LGMO were studied. A leaching efficiency of ~98% was achieved at a leaching time of 2 h, banana peel amount of 4 g, leaching temperature of 120°C, manganese ore amount of 5 g, and sulfuric acid concentration of 15vol%. The phase, microstructural, and chemical analyses of LGMO samples before and after the leaching process confirmed the successful leaching of manganese. Furthermore, the leaching process followed the shrinking core model and the leaching rate was controlled by a surface chemical reaction (1 ? (1 ? x)1/3 = kt) mechanism with an apparent activation energy of 40.19 kJ·mol?1.     

The finished DNA sequence of human chromosome 12

Human chromosome 12 contains more than 1,400 coding genes and 487 loci that have been directly implicated in human disease. The q arm of chromosome 12 contains one of the largest blocks of linkage disequilibrium found in the human genome. Here we present the finished sequence of human chromosome 12, which has been finished to high quality and spans approximately 132 megabases, representing approximately 4.5% of the human genome. Alignment of the human chromosome 12 sequence across vertebrates reveals the origin of individual segments in chicken, and a unique history of rearrangement through rodent and primate lineages. The rate of base substitutions in recent evolutionary history shows an overall slowing in hominids compared with primates and rodents.     

车辆悬架系统的自适应模糊控制(英文)

悬架是用来支持车身的系统,通过隔离道路干扰使得乘客感觉舒适、并确保车辆稳定.为此研究了全车模型悬架系统在下列几种控制方式下的性能:被动控制、半主动控制、自适应标准可加性模型(SAM)下的主动控制.全车模型可以为车辆悬架系统提供一些必要的性能参数,如车身偏移、车轮偏移和悬架偏斜.乘坐的舒适性和车辆的操控性决定了所需悬架系统的性能.乘坐的舒适性取决于车身偏移和乘客座位的偏移,而车辆的稳定由其他自由度(如俯仰和滚转)决定.半主动和主动悬架控制的设计通过MATLAB/SIMULINK加以实现,充分考虑了不规则的路面,并以此验证半主动控制和SAM主动控制的性能.实验结果表明,SAM主动控制能够改善乘坐的舒适性和车辆的操控性.