聚合质量比对Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19／PAn复合体系微波吸收性能的影响

用原位聚合法制备了Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19铁氧体／聚苯胺（PAn）复合材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）对样品的结构、微观表面形貌和粒子大小进行了表征，用微波矢量网络分析仪测量样品在2～12．4GHZ频率范围内复介电常数和复磁导率，根据测量数据计算微波反射率R与频率f的关系。研究结果表明：PAn包覆于掺杂锶铁氧体表面，PAn／Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19复合材料具有良好的吸波性能，随着掺杂锶铁氧体含量的增加，微波吸收匹配厚度和吸收带宽发生变化：当Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19聚合质量比为40％时，最佳匹配厚度为2．6mm，吸收峰值接近-40dB，峰值频率高于12．4GHz，大于10dB吸收带宽预计达到55GHz。     

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.).     

Experimental modification of direction-finding inTalitrus saltator (Montagu) andTalorchestia deshayesei (Aud.) (crustacea-amphipoda)

Riassunto Talitrus saltator (Montagu) eTalorchestia deshayesei (Aud.) (Crustacea-Amphipoda), allontanati dalla sabbia umida della spiaggia, sono in grado di ritornarvi, mantenendo una direzione di fuga praticamente costante in base alla posizione azimutale del Sole. La regolazione dell'angolo di orientamento col Sole nel corso del giorno è basata sul senso del tempo, come dimostrano esperienze simili a quelle recentemente eseguite daHoffmann per gli Storni. È possibile ottenere una significativa deviazione della direzione di fuga, sottoponendo gli animali a temperature relativamente alte prima di saggiare il loro orientamento.     

Hashish VI1: Conversion of (-)-Δ 1(6)-Tetrahydrocannabinol to (-)-Δ 1(7)-Tetrahydrocannabinol. Stability of (-)-Δ 1 and (-)-Δ 1(6)-Tetrahydrocannabinols

Zusammenfassung Die Synthese von (—)-¹⁽⁷⁾-Tetrahydrocannabinol (THC) auf (—)-¹⁽⁶⁾ wird beschrieben. Das Hauptprodukt der oxidativen Zerstörung von (—)-¹-THC ist Cannabinol. Beschleunigte Versuche der Luftoxidation von (—)-¹-THC und (—)-¹⁽⁶⁾-THC haben gezeigt, dass das letztere beständiger ist. Dieser Unterschied kann mit der Reaktivität des C₃-benzylisch-allylischen Wasserstoffes in (—)-¹-THC erklärt werden.     

Effects of Si and Ce on the microstructure and hydrogen storage property of Ti_(26.5)Cr_(20)V_(45)Fe_(8.5)Ce_(0.5) alloy

In this paper,the effects of Si and Ce on the microstructure and hydrogen storage property of Ti26.5 Cr20V45Fe8.5Ce0.5 alloy were studied,respectively.First of all,effects of Si on the microstructure and hydrogen storage properties of Ti26.5Cr20(V45Fe8.5)1-xSixCe0.5(x=0,0.5,1.0,1.5 and 2.0 at%)alloys were studied by X-ray diffraction,scanning electron microscopy and P-C isotherm measurements.As the Si addition increases,the hydrogen absorption capacities of alloys decrease but the equilibrium pressure incre...     

The action of Di-(p-chlorophenyl) trichloromethylcarbinol (DTMC) and Di-(p-chlorophenyl) trifluoromethylcarbinol on houseflies

Résumé L'action des carbinols di-(p-chlorophenyl) trifluorométhyl et di-(p-chlorophenyl) trichlorométhyl (DTMC) a été déterminée sur une souche très résistante de mouches par la méthode de contact. Le premier composé semble agir probablement grâce à de faibles propriétés fumigantes, alors que le second est toxique par contact. L'action toxique de ce dernier est sensiblement augmentée par l'addition du DDT, DDE ou autre composé organique de la série du DDT.

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Chemical development of DTMC.

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Biological evaluation.     

Inducing effect of Pb(Zr_(0.4)Ti_(0.6))O_3 thin film derived by different processes in BiFeO_3/Pb(Zr_(0.4)Ti_(0.6))O_3 multilayer capacitor at room temperature

BiFeO3/PZT multilayer capacitor was prepared on Pt(100) /Ti/SiO2/Si(100) substrate.PZT buffer layer was derived by MOCVD method(label:PZT1) and sputtering method(label:PZT2) respectively.XRD analysis indicated that high(110) orientation of BFO in the BFO/PZT1 structure was achieved.SEM analysis indicated a better microstructure in the BFO/PZT1 structure compared with BFO/PZT2.The remnant polarization of the BFO/PZT1 was 82.5μC/cm2 at an applied voltage of 8 V,compared with that of 25.2μC/cm2 in the BFO/PZT 2 structure.The BFO/PZT1 multilayer exhibited little polarization fatigue(1.5%) upon 1×101 0switching cycles,at an applied voltage of 4 V.The leakage current density was about 2×10-7A/cm 2 at an applied voltage 4 V,in the BFO/PZT1 capacitor.All the results indicated that PZT can act as an inducing layer to the BFO and the MOCVD derived PZT has more inducing effect to the BFO thin film at room temperature.     

Das Elektrovenogramm (Evg) der isolierten Flughautvene (Chiroptera)

Summary The electrovenogram of the isolated vein of the wing membrane (Chiroptera) exhibits two main irregularities in its diphasic action current—a fast initial wave before the beginning of the systole and a very protracted after-wave. Following this the rise and fall of potential run parallel with the contraction and dilatation of the vessels.     

Photoperiodic summation is temperature-dependent inPyrrhocoris apterus (L.) (Heteroptera)

Summary InPyrrhocoris apterus, a low temperature, 15°C, prevented the termination of diapause by long days and, unexpectedly, also the induction of diapause by short days. Both responses were enabled at a higher temperature, 26°C. In contrast to current concepts, it was proved that the summation of photoperiodic signals was temperature-dependent, since the morphogenetic development was prevented by starvation.     

Karyotypes of the panamint kangaroo rat (Dipodomys panamintinus (Merriam))

Résumé Le rat KangourouDipodomys panamintinus a 4 sous-espèces. Le représentatif karyotype de 4 des sousespèces a 17 métacentriques et 14 chromosomes acrocentriques.Dipodomys panamintinus caudatus, géographiquement isolé des autres, a 16 métacentriques et 15 chromosomes acrocentriques. Le nombre fondamental est 96 pour les espèces.

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We wish to acknowledge the kind assistance of the following people in preparation of this paper: Mr.Dave Dunaway, Resident Naturalist, U.S. Forest Service; Mrs.Tilly Chamness, Coordinator, Natural Resource Management, Naval Weapon Center, China Lake.     

Serological relationships of frogs (Ranidae) and toads (Bufonidae)

Zusammenfassung Das Ergebnis der immunoelektrophoretischen Untersuchungen zeigt einen gewaltigen Unterschied in den serologischen Mustern der Frösche (Ranidae) und Kröten (Bufonidae). Die amerikanischen Vertreter der Ranidae und der Bufonidae haben sehr wenig gemeinsame Serumantigene. Der Mangel an gemeinsamen antigenischen Bestandteilen in ihren Serumproteinen weist sowohl auf eine frühe Evolutionstrennung des Frosches und der Kröte wie auch auf ein merkliches genetisches Auseinandergehen der zwei Stämme während der langen Zeitspanne isolierter Existenz hin.

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The work was supported by grant No. GM-11782 from the U.S. Public Health Service.     

Supernumerary (B) chromosome inAnopheles indefinitus (Diptera,Culicidae)

Summary Larval brain mitotic karyotype ofAn. indefinitus from Kanchanaburi exhibits a supernumerary (B) chromosome which is apparently common in that population. 1 or 2 B-chromosomes have been observed in the samples from 5 isofemale lines examined.Acknowledgments. We thank K. Mongkolpanya and P. Kittayarak for species identification. Part of this work was supported by Mahidol University Research Fund and AFRIMS.     

Adventitious juice vesicle initiation in lemon (Citrus limon L.), mandarin (Citrus reticulata Blanco), sour orange (Citrus aurantium L.), and sweet orange (Citrus sinensis (L.) Osb.) fruit explants

Summary Adventitious juice vesicles have been obtained from lemon, mandarin and navel and sour orange juice vesicle explants cultured for prolonged periods on a nutrient medium containing 3.0% sucrose in vitro.