1,723,821 research outputs found
Hydroxy-terminated polyether binders for composite rocket propellants
Full text linkPropellants based on cross-linked Hydroxy Terminated PolyEther (HTPE) binders are
being used as alternatives to Hydroxy Terminated PolyButadiene (HTPB) compositions.
HTPE propellants have similar mechanical properties to HTPB propellants but they give
a less severe response in ‘slow cook-off’ tests for IM compliance. A literature review is
presented on the development and properties of HTPE propellants in an attempt to place
them in relation to recent trends in Insensitive Munitions. To gain a better understanding
of the behaviour of HTPE propellants an HTPE pre-polymer and a range of binder
network samples with different NCO/OH equivalence ratios, with and without
plasticizer, have been synthesised and characterised by a range of techniques. The
thermal decomposition of the HTPE binder network and propellant samples were also
studied. Desmodur N-3200 was used as a curing agent and n-BuNENA as an energetic
plasticizer. Similar analyses were performed on analogous HTPB pre-polymer and
binder network samples and the results were compared with those obtained for the
corresponding HTPE samples. Two kinds of HTPE propellant were manufactured
containing HTPE pre-polymer, n-BuNENA, 2NDPA and either AP or AP+PSAN as
oxidiser. Also HTPB propellant was prepared. Small cook-off test vehicles (SCTV)
were filled with HTPE and HTPB propellants and slow cook-off tests were performed.
In contrast to HTPB binders, which become harder during slow heating, it was found
that the HTPE binders soften under the same conditions. This behaviour is possibly due
to chain scission of the soft and hard segments of the HTPE polymer matrix. Thermooxidative
processes and reactions of the energetic plasticizer decomposition products
are believed to be the responsible for the scission of the polymeric matrix. From the
binder characterisation and slow cook-off results it is concluded that there is a relation
between the degree of polymeric matrix scission during slow heating and the violence
of the response at the point of self ignition. This underlies the main difference between
HTPB and HTPE propellants in slow cook-off. While HTPB compositions become
harder and more brittle, HTPE propellants become softer and have a lower surface area
at the self ignition point
FIGURE 9. Aceria tosichella Keifer, 1969 in <p class="HeadingRunIn" align="left"><strong>Eriophyoid mites from Northeast China (Acari: Eriophyoidea)</strong></p>
No full textFIGURE 9. Aceria tosichella Keifer, 1969: A. Dorsal view of female; B. Ventral view of female; C. Prodorsal shield of female; D. Coxae and female genitalia.Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea), pp. 1-123 in Zootaxa 3689 (1) on page 20, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Phyllocoptes paeoniae Kuang & Luo 2005
No full textPhyllocoptes paeoniae Kuang & Luo, 2005 Phyllocoptes paeoriae Kuang, Luo & Wang, 2005: 67–68. Host. Paeonia lactiflora Pall. (Paeoniaceae). Relation to host. Vagrant.Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 73, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Tetra gleditsiae Kuang & Luo 2005
No full textTetra gleditsiae Kuang & Luo, 2005 Tetra gleditsiae Kuang, Luo & Wang, 2005: 117–118. Host. Gleditsia sinensis Lam. (Leguminosae). Relation to host. Vagrant. Distribution. China (Liaoning).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 96, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Tegolophus changbais Xue, Song & Hong 2007
No full textTegolophus changbais Xue, Song & Hong, 2007 Tegolophus changbais Xue, Song & Hong, 2007c: 21–22. Host. Ulmus sp. (Ulmaceae). Relation to host. Vagrant. Distribution. China (Jilin).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 89, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Tegolophus lespedezae Lin & Kuang 2001
No full textTegolophus lespedezae Lin & Kuang, 2001 Tegolophus lespedezae Lin & Kuang, 2001a: 302–303. Tegolophus lespedezae; Kuang et al., 2005: 109–110. Host. Lespedeza bicolor Turcz. (Fabaceae). Relation to host. Vagrant. Distribution. China (Liaoning).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 89, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Phyllocoptes shenyangensis
No full textPhyllocoptes shenyangensis (Kuang & Luo, 2005) Proartacris shanyangensis Kuang & Luo, 2005; Kuang et al., 2005: 41–42. Host. Pinus sp. (Pinaceae). Relation to host. Vagrant. Distribution. China (Liaoning).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on pages 74-75, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Aculus jingbois Xue, Song & Hong 2008
No full textAculus jingbois Xue, Song & Hong, 2008 Aculus jingbois Xue, Song & Hong, 2008: 48–49. Host. Prunus tomentosa Thunb. (Rosaceae). Relation to host. Vagrant. Distribution. China (Heilongjiang).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 87, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Tetra diamantiacae Xue, Song & Hong 2007
No full textTetra diamantiacae Xue, Song & Hong, 2007 Tetra diamantiacae Xue, Song & Hong, 2007d: 7–9. Host. Rhamnus diamantiaca Nakai (Rhamnaceae). Relation to host. Vagrant. Distribution. China (Heilongjiang).Published as part of XUE, XIAO-FENG, GUO, JING-FENG & HONG, XIAO-YUE, 2013, Eriophyoid mites from Northeast China (Acari: Eriophyoidea) , pp. 1-123 in Zootaxa 3689 (1) on page 95, DOI: 10.11646/zootaxa.3689.1.1, http://zenodo.org/record/603121
Synthesis and thermoelectric properties of InSb alloys by solid reaction
No full textThe data presented in this article are related to the research article entitled” Synthesis and thermoelectric properties of InSb alloys by solid reaction” (Kang Wang, Peng Qin, Zhen-Hua Ge, Jing Feng ,2017) [1]. This article describes a new strategy of eutectic melting for improving the TE properties. We put the powders of In and Sb (both is 200 mesh) with a certain proportion of InSbx (x = 1.0, 1.01, 0.99, 0.97 and 0.95) and sealed them in different crucibles(23 mm × 18 mm)
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