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Substrate: Populus tremula.
Määraja / Identified By Kadri Runnel.
Eesti punase nimestiku liik, ohustatud (EN).
Lüganuse vald, Ida-Virumaa.
I think the plastic is acrylic, and had a protective plastic film sheet on it when I obtained it. Thankfully, epoxy is able to glue acrylic to wood. Had it been polyethylene or polypropylene, the adhesive results would have been more problematic.
This impressioning tool created a dead-smooth (but flat) surface in the test substrate. Resulting test casts that exhibited spontaneous textures proved that such a process occurs. The limitation of this tool is that it doesn't create curves or sidewalls in the crater, so "ridge flow patterns" and other phenomena won't show up.
As Chilcutt mentioned to me, strong compaction of the substrate will often lead to flat ridge peaks. But this does not occur with all desiccation ridges, as is easily demonstrated by sectioning a cast made in a less compacted substrate.
There is a Bigfoot groupie from Texas who was unable to comprehend the sense in which I use the term "virgin". Ironically, she was involved in something of a "Sasquatch scandal" some time back, due to her loud, public sexual vocalizations at a family-oriented gathering.
Substrate: Picea abies.
Eesti punase nimestiku liik, äärmiselt ohustatud (CR). LK I.
Kuusalu vald, Harjumaa (Põhja-Kõrvemaa).
Substrate: Phellinus tremulae, Populus tremula.
Eesti punase nimestiku liik, ohualdis (VU). LK III.
Maapaju, Harjumaa.
The pattern was made on fiberglass mesh using Weldbond as the adhesive. I drew a pattern first, taped it to my work surface, covered it with plastic sheeting so the glass would not stick to the design and finally covered this with the mesh. I could then begin gluing the tessarae to the mesh.
Substrate: Pinus sylvestris, on fallen trunk.
Määraja / Identified By Kadri Runnel.
Salumägi, Põhja-Kõrvemaa.
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Wang et al. first reported a high-flux TFNC-based UF membrane system containing a “nonporous” hydrophilic coating that was water permeable (Pebax or PVA), an electrospun nano-fibrous support, and a nonwoven microfibrous substrate (Fig. 14.9). The TFNC UF membrane was fabricated by cast coating with the separation material on the electrospun membrane. Results indicated that these unique hydrophilic TFNC membranes exhibited a very high flux (several times higher than conventional TFC-based UF membranes) and comparable high rejection ratio for oil-and-water emulsion separation. Interestingly, the permeability of TFNC UF membranes can be dramatically increased by introducing nanofillers (such as surface-oxidized multiwalled carbon nanotubes [MWCNTs] or cellulose nanofibers [CNs]) as a means to induce water channels in the barrier layer. For example, the addition of 1.3 wt% of CNs or 10 wt% of oxidized MWCNTs could increase permeability by two to three times with the similar rejection ratio of 99.8% for oil/water emulsion. Wang et al. also used electrospinning to fabricate a PVA-based substrate, followed by crosslinking to improve the structural stability and mechanical strength of the membrane. In addition, the applied fabricated membrane seems to be efficient in UF techniques because of low membrane fouling in nature. Yoon et al. demonstrated that after 24 h of operation, the permeate flux for the electrospun-based membrane remained stable, whereas a commercial UF membrane experienced severe flux decline. The success of the aforementioned TFNC UF membranes could be attributed partially to the unique characteristics of an electrospun scaffold with high porosity and interconnected pores and the utilization of a highly hydrophilic barrier layer (e.g., PVA).
Substrate: Phellinus tremulae, Populus tremula.
Määraja / Identified By Irja Saar.
Eesti punase nimestiku liik, ohualdis (VU). LK III.
Sirtsi, Ida-Virumaa.
Substrate: Picea abies, on fallen trunk.
Eesti punase nimestiku liik, ohulähedane (NT).
Püüsaar, Põhja-Kõrvemaa.
Challenge: To develop packaging to transport, ship and store fragile substrates in an environment isolated from oxygen and humidity while also protecting from ESD, particles and outgassing.
Solution: This project concerned designing inert storage conditions for fragile substrates. We started with a photomask compact made of an inherently dissipative polymer proven in the industry to protect against ESD, particles and outgassing. The unique AU standoff design reduces particle emitting abrasion by securely holding the substrate on the beveled edges without contacting the surface. The self-aligning features of the AU standoffs reduce the risk of misplacement during insertion and removal of the device.
Once the device was secured in the compact, we created optimal inert storage conditions by adding N2 Purge capability. Traditional quick connect couplings use springs that generate particles and require lubricant, both potential sources of contamination. To address these concerns, we designed a quick connect valve that utilizes an open hose and low flow system to purge the compact and isolate the fragile substrate from oxygen and humidity.
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