Abstract Feasibility of drilling with pure supercritical carbon dioxide to serve the needs deep underbalanced operations has been analyzed. A case study involving access a depleted gas reservoir illustrates need for such study. For this well, nitrogen was initially considered as fluid. Dry nitrogen, due its low density, unable generate sufficient torque in downhole motor. Mixture and water, stabilized foam, generated torque, but made it difficult maintain conditions. This diminished intended...

Journal Article Phase Contrast and Histochemical Studies of Spherule Cells in Cockroaches (Dictyoptera) Get access A. P. Gupta, Gupta Department Entomology Economic Zoology Bureau Conservation Environmental Science, Rutgers—The State University, New Brunswick, Jersey Search for other works by this author on: Oxford Academic Google Scholar D. J. Sutherland Annals the Entomological Society America, Volume 60, Issue 3, 15 May 1967, Pages 557–565, https://doi.org/10.1093/aesa/60.3.557 Published:...

Chlordane caused some apparent increase in the total hemocyte count treated American cockroaches, Periplaneta americana (L.). Correspondingly, plasmatocytes, granular hemocytes, spherule cells, and cystocytes increased number. Patterns of transformation fusiform plasmatocytes into round forms, cellular degeneration 4 types hemocytes were inconsistent. No or debris was observed hemolymph cockroaches. In midgut epithelium, chlordane disruption formation peritrophic membrane, vacuolization,...

Abstract The various sensilla on the antennae and labial maxillary palps of Blattella germanica (L.) were studied. Thick‐walled chemoreceptors with fluted shafts articulated bases are located palps. Thin‐walled chemoreceptors, without or bases, restricted to flagellar segments distal Antennae adult males have more thin‐walled than do those females. Hair‐plate found at scape‐head scape‐pedicel joints, joints Campaniform concentrated as a ring around margin pedicel, also scattered singly...

Abstract Light microscopy (LM) and scanning (SEM) transmission electron (TEM) disclose seven types of hemocytes in adults the German cockroach, Blattella germanica (Dictyoptera: Blattellidae)—namely, prohemocytes (PR), granulocytes (GR), plasmatocytes (PL), spherulocytes (SP), adipohemocytes (AD), coagulocytes (CO), oenocytoids (OE). Their shape, size, surface appearance, internal ultrastructure are characterized here. The shapes relative sizes noted vitro have been compared with those...

In this paper, optimal design of PID controllers has been proposed for time delay systems using various soft computing algorithms. Time exist in several real world applications, and the is generally caused by taken sensor to sense parameter, communication etc. Hence such characteristics lead instabilities make it difficult control system. Classical theory methods fail designing stable controller systems. So, order address problem, posed as an optimization problem solved genetic algorithm...

The identity of the so-called cresecent cell in hemolymph cockroach, Gromphadorhina portentosa (Schaum) (Dictyoptera: Blaberidae) has been established. These hemocytes are indeed oenocytoids (OEs). these cells was con-firmed by observations both last instar nymphs and adults. OEs appear as polymorphic anucleate cells. Each OE a crescent-shaped inclusion body that generally fills gradually diminishes size density ages. vary from 16 to 28μm length 10 22.4μm width. They constitute 2% total...

Abstract Studies were undertaken to determine the ultrastructure and function of spiculum copulatus (SC) on seventh abdominal tergum adult male Blattella germanica (L.). The SC is located in between anterior pair tergal gland orifices. It approximately 250 μm long 40 diameter at base. invested with numerous sensilla, many which are bifurcate trifurcate. Cauterization leads cessation certain phases precopulatory behavior (such as extension arching abdomen clamping genitalia), thereby...

This paper presents the comparative experimental and numerical study of heat exchange through tapers helical spiral tube. The efficiency is increase thermal performance as well productivity. main was a focus on these two shapes pipe at various process parameters like mass flow rate inlet temperature conditions. Co-relation equations were developed for both with linear fitting tool available in MATLAB coding software. Proper instrumentation calibration taken care this work. simple horizontal...

The German cockroach, Blattella germanica (L.) (Dic-tyoptera: Blattellidae) has two major immunocytes (blood cells) (granulocytes (GRs) and plasmatocytes). GRs participate both in encapsulation phagocytosis of nonself tissue. Structurally, the are flattened discoid, contain, among other organelles, microtubules that arranged form a bundle their peripheral region plane flattening. If one implants foreign tissue cockroach's abdomen, become activated begin to encapsulate implant by flattening...